US20150285444A1 - Nanocomposite, and optical member and backlight unit having the optical member - Google Patents
Nanocomposite, and optical member and backlight unit having the optical member Download PDFInfo
- Publication number
- US20150285444A1 US20150285444A1 US14/442,077 US201314442077A US2015285444A1 US 20150285444 A1 US20150285444 A1 US 20150285444A1 US 201314442077 A US201314442077 A US 201314442077A US 2015285444 A1 US2015285444 A1 US 2015285444A1
- Authority
- US
- United States
- Prior art keywords
- light
- nanocomposite
- wax
- emitting body
- wax particle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 454
- 230000003287 optical effect Effects 0.000 title claims description 308
- 239000002245 particle Substances 0.000 claims abstract description 209
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 239000010410 layer Substances 0.000 claims description 331
- 238000009792 diffusion process Methods 0.000 claims description 186
- 239000000758 substrate Substances 0.000 claims description 112
- 150000001875 compounds Chemical class 0.000 claims description 102
- 239000002585 base Substances 0.000 description 98
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 90
- 238000004519 manufacturing process Methods 0.000 description 83
- 230000000052 comparative effect Effects 0.000 description 77
- 239000000243 solution Substances 0.000 description 62
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 34
- -1 polyethylene Polymers 0.000 description 29
- 239000000126 substance Substances 0.000 description 29
- 239000000463 material Substances 0.000 description 27
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- 239000000178 monomer Substances 0.000 description 24
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 21
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- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 18
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- 125000000217 alkyl group Chemical group 0.000 description 7
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 7
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- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 6
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- 239000008186 active pharmaceutical agent Substances 0.000 description 5
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- 239000011324 bead Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000002952 polymeric resin Substances 0.000 description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 229910052702 rhenium Inorganic materials 0.000 description 5
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- MLGITEWCALEOOJ-UHFFFAOYSA-N 2-(thiiran-2-ylmethylsulfanylmethyl)thiirane Chemical compound C1SC1CSCC1CS1 MLGITEWCALEOOJ-UHFFFAOYSA-N 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 3
- XITRBUPOXXBIJN-UHFFFAOYSA-N bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate Chemical compound C1C(C)(C)NC(C)(C)CC1OC(=O)CCCCCCCCC(=O)OC1CC(C)(C)NC(C)(C)C1 XITRBUPOXXBIJN-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000000295 emission spectrum Methods 0.000 description 3
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
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- RKHXQBLJXBGEKF-UHFFFAOYSA-M tetrabutylphosphanium;bromide Chemical compound [Br-].CCCC[P+](CCCC)(CCCC)CCCC RKHXQBLJXBGEKF-UHFFFAOYSA-M 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- SKJCKYVIQGBWTN-UHFFFAOYSA-N (4-hydroxyphenyl) methanesulfonate Chemical compound CS(=O)(=O)OC1=CC=C(O)C=C1 SKJCKYVIQGBWTN-UHFFFAOYSA-N 0.000 description 2
- IHGSAQHSAGRWNI-UHFFFAOYSA-N 1-(4-bromophenyl)-2,2,2-trifluoroethanone Chemical compound FC(F)(F)C(=O)C1=CC=C(Br)C=C1 IHGSAQHSAGRWNI-UHFFFAOYSA-N 0.000 description 2
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- MARUHZGHZWCEQU-UHFFFAOYSA-N 5-phenyl-2h-tetrazole Chemical compound C1=CC=CC=C1C1=NNN=N1 MARUHZGHZWCEQU-UHFFFAOYSA-N 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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- ZZEMEJKDTZOXOI-UHFFFAOYSA-N digallium;selenium(2-) Chemical compound [Ga+3].[Ga+3].[Se-2].[Se-2].[Se-2] ZZEMEJKDTZOXOI-UHFFFAOYSA-N 0.000 description 2
- 238000002296 dynamic light scattering Methods 0.000 description 2
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- OCGWQDWYSQAFTO-UHFFFAOYSA-N tellanylidenelead Chemical compound [Pb]=[Te] OCGWQDWYSQAFTO-UHFFFAOYSA-N 0.000 description 2
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- AKJVMGQSGCSQBU-UHFFFAOYSA-N zinc azanidylidenezinc Chemical compound [Zn++].[N-]=[Zn].[N-]=[Zn] AKJVMGQSGCSQBU-UHFFFAOYSA-N 0.000 description 2
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- 229910052793 cadmium Inorganic materials 0.000 description 1
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- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 description 1
- AHUXYBVKTIBBJW-UHFFFAOYSA-N dimethoxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](OC)(OC)C1=CC=CC=C1 AHUXYBVKTIBBJW-UHFFFAOYSA-N 0.000 description 1
- LIKFHECYJZWXFJ-UHFFFAOYSA-N dimethyldichlorosilane Chemical compound C[Si](C)(Cl)Cl LIKFHECYJZWXFJ-UHFFFAOYSA-N 0.000 description 1
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 1
- RPQDHPTXJYYUPQ-UHFFFAOYSA-N indium arsenide Chemical compound [In]#[As] RPQDHPTXJYYUPQ-UHFFFAOYSA-N 0.000 description 1
- 125000000468 ketone group Chemical group 0.000 description 1
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
- 229910000370 mercury sulfate Inorganic materials 0.000 description 1
- VCEXCCILEWFFBG-UHFFFAOYSA-N mercury telluride Chemical compound [Hg]=[Te] VCEXCCILEWFFBG-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 239000005055 methyl trichlorosilane Substances 0.000 description 1
- 239000005048 methyldichlorosilane Substances 0.000 description 1
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 1
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- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
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- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 description 1
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- HOKBIQDJCNTWST-UHFFFAOYSA-N phosphanylidenezinc;zinc Chemical compound [Zn].[Zn]=P.[Zn]=P HOKBIQDJCNTWST-UHFFFAOYSA-N 0.000 description 1
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- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
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- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
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- AHMCFSORHHSTSB-UHFFFAOYSA-N selanylidenecalcium Chemical compound [Se]=[Ca] AHMCFSORHHSTSB-UHFFFAOYSA-N 0.000 description 1
- GGYFMLJDMAMTAB-UHFFFAOYSA-N selanylidenelead Chemical compound [Pb]=[Se] GGYFMLJDMAMTAB-UHFFFAOYSA-N 0.000 description 1
- YQMLDSWXEQOSPP-UHFFFAOYSA-N selanylidenemercury Chemical compound [Hg]=[Se] YQMLDSWXEQOSPP-UHFFFAOYSA-N 0.000 description 1
- PFNOMMSIZHKPBO-UHFFFAOYSA-N selanylidenestrontium Chemical compound [Sr]=[Se] PFNOMMSIZHKPBO-UHFFFAOYSA-N 0.000 description 1
- MFIWAIVSOUGHLI-UHFFFAOYSA-N selenium;tin Chemical compound [Sn]=[Se] MFIWAIVSOUGHLI-UHFFFAOYSA-N 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- UFTQLBVSSQWOKD-UHFFFAOYSA-N tellanylidenecalcium Chemical compound [Te]=[Ca] UFTQLBVSSQWOKD-UHFFFAOYSA-N 0.000 description 1
- ZTBJFXYWWZPTFM-UHFFFAOYSA-N tellanylidenemagnesium Chemical compound [Te]=[Mg] ZTBJFXYWWZPTFM-UHFFFAOYSA-N 0.000 description 1
- UURRKPRQEQXTBB-UHFFFAOYSA-N tellanylidenestannane Chemical compound [Te]=[SnH2] UURRKPRQEQXTBB-UHFFFAOYSA-N 0.000 description 1
- AMFBHLUXSAEGHH-UHFFFAOYSA-N tellanylidenestrontium Chemical compound [Te]=[Sr] AMFBHLUXSAEGHH-UHFFFAOYSA-N 0.000 description 1
- ZGNPLWZYVAFUNZ-UHFFFAOYSA-N tert-butylphosphane Chemical compound CC(C)(C)P ZGNPLWZYVAFUNZ-UHFFFAOYSA-N 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- FAKFSJNVVCGEEI-UHFFFAOYSA-J tin(4+);disulfate Chemical compound [Sn+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O FAKFSJNVVCGEEI-UHFFFAOYSA-J 0.000 description 1
- ZOYFEXPFPVDYIS-UHFFFAOYSA-N trichloro(ethyl)silane Chemical compound CC[Si](Cl)(Cl)Cl ZOYFEXPFPVDYIS-UHFFFAOYSA-N 0.000 description 1
- ORVMIVQULIKXCP-UHFFFAOYSA-N trichloro(phenyl)silane Chemical compound Cl[Si](Cl)(Cl)C1=CC=CC=C1 ORVMIVQULIKXCP-UHFFFAOYSA-N 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 1
- RMZAYIKUYWXQPB-UHFFFAOYSA-N trioctylphosphane Chemical compound CCCCCCCCP(CCCCCCCC)CCCCCCCC RMZAYIKUYWXQPB-UHFFFAOYSA-N 0.000 description 1
- ZMBHCYHQLYEYDV-UHFFFAOYSA-N trioctylphosphine oxide Chemical compound CCCCCCCCP(=O)(CCCCCCCC)CCCCCCCC ZMBHCYHQLYEYDV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
-
- F21K9/56—
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7706—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
- C09K11/881—Chalcogenides
- C09K11/883—Chalcogenides with zinc or cadmium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/049—Patterns or structured surfaces for diffusing light, e.g. frosted surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
-
- F21Y2113/005—
Definitions
- the present invention relates to a nanocomposite, and an optical member and a backlight unit having the optical member.
- a nano light-emitting body including a quantum dot or the like is a material having a crystalline structure with a size of several to tens nanometers, and is constituted by hundreds to thousands atoms. Since a band gap increases as sizes of the nano light-emitting bodies are reduced even when the nano light-emitting bodies are formed of the same material, emission properties become different according to the sizes of the nano light-emitting bodies. In addition, the emission properties become different according to the used material even when the nano light-emitting bodies have the same size.
- the nano light-emitting bodies are variously used in various kinds of light emitting devices and electronic devices by adjusting such properties thereof.
- nano light-emitting bodies are very sensitive to ultraviolet light, heat, moisture, and so on, a lifespan of an electronic device may be reduced when the nano light-emitting bodies are applied to electronic devices or the like.
- methods of forming protective layers on upper and lower surfaces of a thin film including the nano light-emitting bodies to protect the nano light-emitting bodies in the thin film from ultraviolet light, heat, moisture, and so on have been proposed, it is difficult to completely prevent intrusion of the moisture into the thin film.
- a display device uses a white light source configured to emit white light in general. As the white light passes through a color filter, a user who observes the display device can see a color image.
- the white light source includes a blue light emitting diode (LED) chip configured to emit blue light, and a photoconversion substance configured to allow the light source to finally emit white light using the blue light.
- An yttrium aluminum garnet (YAG) phosphor is mainly used as the photoconversion substance.
- the YAG phosphor has a wide emission spectrum throughout a red light wavelength band and a green light wavelength band, it is difficult to increase color purity of the color represented as the light generated by the white light source using the phosphor passes through the color filter, and color reproducibility of the display device may be decreased.
- the present invention is directed to providing a nanocomposite capable of improving stability of a nano light-emitting body with respect to ultraviolet light, heat, moisture, and so on.
- the present invention is also directed to providing a backlight unit to which at least one of the optical member, the diffusion sheet and the light collection sheet is applied.
- a nanocomposite according to an embodiment of the present invention includes a wax particle, at least one nano light-emitting body and an inner protective layer.
- the nano light-emitting body is disposed in the wax particle.
- the inner protective layer coats the nano light-emitting body and is formed of silicon oxide.
- the inner protective layer may coat one nano light-emitting body. Unlike this, the inner protective layer may coat two or more nano light-emitting bodies.
- the nanocomposite may further include an outer protective layer.
- the outer protective layer may coat a surface of the wax particle and may be formed of silicon oxide.
- the nanocomposite may include a wax layer formed on a surface of the outer protective layer and formed of a wax-based compound.
- the nanocomposite may include a wax layer formed on a surface of the outer protective layer and including a wax-based compound.
- An optical member includes a base substrate, and a first optical layer disposed on one surface of the base substrate and in which at least one nanocomposite is distributed.
- the first nanocomposite includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- At least one of the first to third nanocomposites may further include an inner protective layer or an outer protective layer formed of silicon oxide.
- the inner protective layer may coat a surface of any one of the first to third nano light-emitting bodies, and the outer protective layer may coat a surface of any one of the first to third wax particles.
- the wax layer formed of the wax-based compound may coat a surface of the outer protective layer.
- a diffusion sheet includes a base substrate, and a first optical layer disposed on one surface of the base substrate, in which at least one nanocomposite is disposed, and having a light diffusion pattern formed on a surface thereof.
- the first nanocomposite includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- the diffusion sheet may further include a second optical layer disposed on the other surface opposite to the one surface and including at least one second nanocomposite.
- the second nanocomposite may include a second wax particle, and at least one nano light-emitting body disposed in the second wax particle.
- a light diffusion pattern may be formed on a surface of the second optical layer.
- the diffusion sheet may further include a second optical layer disposed on the other surface of the base substrate opposite to the one surface and having a light collection pattern formed on a surface thereof.
- a diffusion sheet includes a base substrate, a light diffusion layer formed on one surface of the base substrate, and a first optical layer formed on the other surface of the base substrate opposite to the one surface and including at least one first nanocomposite.
- the first nanocomposite includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- the diffusion sheet may further include a second optical layer disposed on the first optical layer and including at least one second nanocomposite.
- the second nanocomposite may include a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle.
- a light collection sheet includes a base substrate, and a light collection pattern including a nanocomposite disposed on the base substrate and having at least one nano light-emitting body disposed in the wax particle.
- the light source may include a blue light emitting module.
- the nano light-emitting body is protected by a wax-based compound or silicon oxide, light stability and moisture/heat stability of the nano light-emitting body can be remarkably improved.
- FIG. 2 is a view for describing a nano light-emitting body shown in FIGS. 1A to 1C ;
- FIGS. 3A to 3C are views for describing a nanocomposite according to another embodiment of the present invention.
- FIGS. 5A to 5I are views for describing embodiments of a diffusion sheet according to the present invention.
- FIGS. 8 and 9 are views for describing a backlight unit according to an embodiment of the present invention.
- FIG. 12 is a view for describing 9 points of a color coordinates uniformity estimation test.
- first, second, or the like may be used to describe various components, the components are not limited by the terms. The terms are used only to distinguish one component from another component. For example, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component without departing from the spirit of the present invention.
- a wax-based compound is an organic compound that is in a solid state at room temperature and has a melting point higher than room temperature
- a wax particle is a regular or irregular particle configured by recrystallizing the wax-based compound and physically forming a monolithic body.
- room temperature is a temperature within a range of about 15° C. to about 25° C.
- emission is a phenomenon in which electrons in the material are transitioned from a ground state to an excited state by an external stimulus, and then the electrons in the excited state are dropped to the stable ground state to emit light corresponding to a difference in energy between the ground state and the excited state.
- a blue nanocomposite is a nanocomposite in which the nano light-emitting body is formed of only a blue nano light-emitting body.
- a green nanocomposite is a nanocomposite in which the nano light-emitting body is formed of only a green nano light-emitting body
- a red nanocomposite is a nanocomposite in which the nano light-emitting body is formed of only a red nano light-emitting body.
- a multi-color nanocomposite is a nanocomposite in which the nano light-emitting body is formed of at least two kinds of nano light-emitting bodies selected from the blue, green and red nano light-emitting bodies.
- the blue nano light-emitting body is generally a nano light-emitting body having an emission peak in a blue wavelength band of about 430 nm to about 470 nm
- the green nano light-emitting body is generally a nano light-emitting body having an emission peak in a green wavelength band of about 520 nm to about 560 nm
- the red nano light-emitting body is generally a nano light-emitting body having an emission peak in a red wavelength band of about 600 nm to about 660 nm.
- FIGS. 1A to 1C are views for describing a nanocomposite according to an embodiment of the present invention
- FIG. 2 is a view for describing a nano light-emitting body shown in FIGS. 1A to 1C .
- a nanocomposite 100 a according to the embodiment of the present invention includes a wax particle 110 , and at least one nano light-emitting body 120 disposed in the wax particle 110 .
- the wax particle 110 is formed of a wax-based compound.
- the wax particle 110 may encapsulate the nano light-emitting body 120 to prevent damage to the nano light-emitting body 120 due to moisture, heat, light, and so on, caused by an external environment.
- the wax particle 110 may stably distribute the nano light-emitting body 120 in a resin to form a base substrate or an optical coating layer of the optical member.
- encapsulation means that the nano light-emitting body 120 is disposed in the wax particle 110 and the nano light-emitting body 120 is surrounded by the wax particle 110 .
- Van der Waals force may be applied between the nano light-emitting body 120 and the wax particle 110 .
- a polymer, copolymer or oligomer typed synthetic wax may be used as the wax-based compound that constitutes the wax particle 110 .
- a polyethylene-based wax, a polypropylene-based wax or an amide-based wax may be used as the wax-based compound.
- the wax-based compound when the wax-based compound is the polyethylene-based wax or the polypropylene-based wax, the wax-based compound may include at least one of monomers represented by the following chemical formula 1 to chemical formula 7.
- R 1 , R 3 , R 5 and R 7 may independently be a single bond or an alkylene group (*—(CH2) x -*, x is an integer of 1 to 10) with 1 to 10 carbon atoms
- R 2 , R 4 , R 6 and R 8 may independently be hydrogen or an alkyl group with 1 to 10 carbon atoms
- R a , R b , R c , R d , R e , R f and R g may independently be hydrogen or an alkyl group with 1 to 3 carbon atoms.
- the monomer of the chemical formula 1 when R 2 of the chemical formula 1 is hydrogen, the monomer of the chemical formula 1 may include a carboxy group, and unlike this, when R 2 of the chemical formula 1 is an alkyl group having 1 to 10 carbon atoms, the monomer of the chemical formula 1 may include an ester group.
- R 4 of the chemical formula 2 when R 4 of the chemical formula 2 is hydrogen, the monomer of the chemical formula 2 may include an aldehyde group, and unlike this, when R 4 of the chemical formula 2 is an alkyl group having 1 to 10 carbon atoms, the monomer of the chemical formula 2 may include a ketone group.
- R 6 of the chemical formula 3 when R 6 of the chemical formula 3 is hydrogen, the monomer of the chemical formula 3 may include a hydroxy group, and unlike this, when R 6 of the chemical formula 3 is an alkyl group having 1 to 10 carbon atoms, the monomer of the chemical formula 3 may include an ether group.
- the wax-based compound may be a polyethylene-based wax.
- the polyethylene-based wax may be a polyethylene wax (a PE wax) including only a monomer of the chemical formula 7 in which R g is hydrogen.
- the polyethylene-based wax may be the polyethylene wax further including at least one of oxygen-containing monomers of the chemical formula 1 to 6 in which R a , R b , R c , R d , R e and R f are hydrogen, besides the monomer of the chemical formula 7 in which R g is hydrogen.
- the polyethylene-based wax further including the at least one of the oxygen-containing monomers may include an oxidized polyethylene wax (an oxidized PE wax) which is an oxide of the polyethylene, an ethylene-acrylic acid copolymer, an ethylene-vinyl acetate copolymer, an ethylene-maleic anhydride copolymer, and so on.
- an oxidized PE wax an oxidized polyethylene wax which is an oxide of the polyethylene, an ethylene-acrylic acid copolymer, an ethylene-vinyl acetate copolymer, an ethylene-maleic anhydride copolymer, and so on.
- the polypropylene-based wax may be a polypropylene wax further including at least one of oxygen-containing monomers of the chemical formulae 1 to 6 in which R a , R b , R c , R d , R e and R f are hydrogen, besides the monomer of the chemical formula 7 in which R g is a methyl group.
- the polypropylene-based wax further including the at least one of the oxygen-containing monomers may include a propylene-maleic anhydride copolymer or the like.
- the wax-based compound when the wax-based compound is an amide-based wax, the wax-based compound may be a polymer, copolymer or oligomer in which a main chain includes an amide bond (—CONH—).
- the amide-based wax may include a monomer having 1 to 10 carbon atoms.
- the amide-based wax may further include at least one of oxygen-containing monomers represented by the chemical formulae 1 to 6, besides the monomer having 1 to 10 carbon atoms.
- the wax particle 110 may more stably encapsulate the nano light-emitting body 120 than when only the monomer of the chemical formula 7 is included. This is because, when the wax-based compound includes the oxygen-containing monomer, interaction between metals of the nano light-emitting body 120 and the wax particle 110 is strengthened by polarity of oxygen contained in the oxygen-containing monomer.
- the wax particle 110 is more advantageous for encapsulation of the nano light-emitting body 120 , because the interaction between the wax particle 110 and the nano light-emitting body 120 is further strengthened. Accordingly, in the embodiment of the present invention, the wax particle 110 may be formed of the wax-based compound including at least the carboxy group serving as a substituent.
- the wax-based compound that constitutes the wax particle 110 may have an acid value of about 1 mg KOH/g to about 200 mg KOH/g.
- the acid value of the wax-based compound is the number of mg of potassium hydroxide (KOH) required for neutralization of the wax-based compound 1g.
- KOH potassium hydroxide
- An amount of the carboxy group contained in the wax-based compound may increase as the acid value of the wax-based compound increases.
- the nano light-emitting body 120 may not be stably encapsulated because the amount of the carboxy group that interacts with the nano light-emitting body 120 is very slight.
- the wax particle 110 may be formed of a wax-based compound having a high density of about 0.95 g/cm 3 or more. Since the high density wax-based compound having a high density of about 0.95 g/cm 3 has a melting point relatively higher than a low density wax-based compound having a low density of less than about 0.95 g/cm 3 , a heat resistance of the nanocomposite 100 a including the wax particle 110 formed of the high density wax-based compound can be improved. In addition, since the high density wax-based compound has better crystallizability upon recrystallization than the low density wax-based compound, the wax particle 110 formed of the high density wax-based compound can more stably encapsulate the nano light-emitting body 120 .
- the polyethylene (PE) wax may be classified as a high density PE wax (an HDPE wax) having a density of about 0.95 g/cm 3 or more and a low density PE wax (an LDPE wax) having a density of less than about 0.95 g/cm 3 , and the wax particle 110 may be formed of the HDPE wax.
- the density of the HDPE wax may be about 1.20 g/cm 3 or less, and in this case, a melting point of the HDPE wax may be about 120° C. to about 200° C.
- a melting point of the LDPE wax may be about 80° C. to about 110° C. Accordingly, the wax particle 110 formed of the HDPE wax can improve the heat resistance of the nanocomposite 100 a according to the present invention more than that formed of the LDPE wax.
- the wax particle 110 may be formed of a wax-based compound having a weight-average molecular weight of about 1,000 to 20,000.
- the weight-average molecular weight is an average molecular weight obtained by averaging molecular weights of component molecular species of a polymer compound having a molecular weight distribution with a weight fraction.
- the weight-average molecular weight of the wax-based compound is less than about 1,000, since the wax-based compound cannot easily stay in a solid state at room temperature, it may be difficult to encapsulate the nano light-emitting body 120 at room temperature.
- the weight-average molecular weight of the wax-based compound exceeds about 20,000, since a recrystallization size (an average diameter) of the wax-based compound is several hundreds of ⁇ m or more, even if the composite is manufactured using the wax-based compound, the wax-based compound cannot be easily distributed in a solvent or a resin. Further, when the molecular weight of the wax-based compound exceeds about 20,000, since the wax-based compound has a melting point of about 200° C. or more, the nano light-emitting body 120 may be damaged during a process of encapsulating the nano light-emitting body 120 with the wax-based compound.
- a known nano light-emitting body may be used as the nano light-emitting body 120 with no limitation.
- the nano light-emitting body 120 may include a center particle 121 , and a ligand 123 coupled to a surface of the center particle 121 .
- the center particle 121 may be formed of group II-VI compounds, group II-V compounds, group III-V compounds, group III-IV compounds, group III-VI compounds, group IV-VI compounds, or a mixture thereof.
- the mixture includes cases in which a dopant is doped in a ternary system compound, a tetrad system compound, or a mixture thereof, in addition to a simply mixed mixture.
- Examples of the group II-VI compounds may include magnesium sulfate (MgS), magnesium selenide (MgSe), magnesium telluride (MgTe), calcium sulfate (CaS), calcium selenide (CaSe), calcium telluride (CaTe), strontium sulfate (SrS), strontium selenide (SrSe), strontium telluride (SrTe), cadmium sulfate (CdS), cadmium selenide (CdSe), cadmium telluride (CdTe), zinc sulfate (ZnS), zinc selenide (ZnSe), zinc telluride (ZnTe), mercury sulfate (HgS), mercury selenide (HgSe), mercury telluride (HgTe), or the like.
- MgS magnesium sulfate
- MgSe magnesium selenide
- MgTe magnesium telluride
- CaS calcium selenide
- Examples of the group II-V compounds may include zinc phosphide (Zn 3 P 2 ), zinc arsenide (Zn 3 As 2 ), cadmium phosphide (Cd 3 P 2 ), cadmium arsenide (Cd 3 As 2 ), cadmium nitride (Cd 3 N 2 ), zinc nitride (Zn 3 N 2 ), or the like.
- Examples of the group III-V compounds may include boron phosphide (BP), aluminum phosphide (AlP), aluminum arsenide (AlAs), aluminum antimonide (AlSb), gallium nitride (GaN), gallium phosphide (GaP), gallium arsenide (GaAs), gallium antimonide (GaSb), indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), indium antimonide (InSb), aluminum nitride (AlN), boron nitride (BN), or the like.
- BP boron phosphide
- AlP aluminum phosphide
- AlAs aluminum arsenide
- AlSb aluminum antimonide
- GaN gallium phosphide
- GaP gallium arsenide
- GaAs gallium antimonide
- InN in
- Examples of the group III-IV compounds may include boron carbide (B 4 C), aluminum carbine (Al 4 C 3 ), gallium carbide (Ga 4 C), or the like.
- Examples of the group III-VI compounds may include aluminum sulfate (Al 2 S 3 ), aluminum selenide (Al 2 Se 3 ), aluminum telluride (Al 2 Te 3 ), gallium sulfate (Ga 2 S 3 ), gallium selenide (Ga 2 Se 3 ), indium sulfate (In 2 S 3 ), indium selenide (In 2 Se 3 ), gallium telluride (Ga 2 Te 3 ), indium telluride (In 2 Te 3 ), or the like.
- Examples of the group IV-VI compounds may include lead sulfate (PbS), lead selenide (PbSe), lead telluride (PbTe), tin sulfate (SnS), tin selenide (SnSe), tin telluride (SnTe), or the like.
- the center particle 121 may have a core/shell structure. Both a core and a shell of the center particle 121 may be formed of the exemplified compounds above. The exemplified compounds may be used alone or in combinations of two or more to form the core or the shell. While a band gap of the compound that forms the core may be smaller than a band gap of the compound that forms the shell, it is not limited thereto. However, when the center particle 121 has a core/shell structure, the compound that forms the shell is different from the compound that forms the core.
- the center particle 121 may have a CdSe/ZnS (core/shell) structure having a core including CdSe and a shell including ZnS, or an InP/ZnS (core/shell) structure having a core including InP and a shell including ZnS.
- CdSe/ZnS core/shell
- InP/ZnS core/shell
- the center particle 121 may have a core/multi-shell structure provided with a shell having at least two layers or more.
- the center particle 121 may have a CdSe/ZnSe/ZnS (core/first shell/second shell) structure having a core including CdSe, a first shell surrounding a surface of the core and including ZnSe, and a second shell surrounding a surface of the first shell and including ZnS.
- the center particle 121 may have an InP/ZnSe/ZnS (core/first shell/second shell) structure having a core including InP, a first shell including ZnSe, and a second shell including ZnS.
- the center particle 121 is a single structure, which may be formed of the group II-VI compounds only or the group III-V compounds only, instead of the core/shell structure.
- the center particle 121 may further include a cluster molecule serving as a seed.
- the cluster molecule is a compound serving as a seed in a process of manufacturing the center particle 121 , and the center particle 121 can be formed by growing the center particle 121 on the cluster molecule, using a precursor of the compound constituting the center particle 121 .
- various compounds disclosed in Korean Patent Laid-open Publication No. 2007-0064554 may be used as the cluster molecule, but the cluster molecule is not limited thereto.
- the ligand 123 can prevent the neighboring center particles 121 from being agglomerated and quenched.
- the ligand 123 may be bonded to the center particle 121 and may have hydrophobicity.
- the amine-based compound, the carboxy group acid compound, or the like, having the alkyl group with 6 to 30 carbon atoms may be used.
- the amine-based compound having the alkyl group may include hexadecylamine, octylamine, or the like.
- the amine-based compound, the carboxy group acid compound, or the like, having the alkenyl group having 6 to 30 carbon atoms may be used.
- the nanocomposite 100 a may have various shapes, and the one nanocomposite 100 a may have the at least one nano light-emitting body 120 .
- the one nano light-emitting body 120 may be disposed in the one wax particle 110 , or unlike this, two to tens of millions of nano light-emitting bodies 120 may be disposed in the one wax particle 110 .
- the plurality of nano light-emitting bodies 120 disposed in the one wax particle 110 may have the emission peak in the same wavelength band. That is, the nano light-emitting bodies 120 may include any one selected from a first color nano light-emitting body having an emission peak in a first wavelength band, a second color nano light-emitting body having an emission peak in a second wavelength band, and a third color nano light-emitting body having an emission peak in a third wavelength band.
- the first color nano light-emitting body may be a blue nano light-emitting body having an emission peak in a wavelength band of about 430 nm to about 470 nm
- the second color nano light-emitting body may be a green nano light-emitting body having an emission peak in a wavelength band of about 520 nm to about 560 nm
- the third color nano light-emitting body may be a red nano light-emitting body having an emission peak in a wavelength band of about 600 nm to about 660 nm.
- the nanocomposite 100 a may be referred to as any one of the blue nanocomposite, the green nanocomposite and the red nanocomposite.
- the plurality of nano light-emitting bodies 120 disposed in the one wax particle 110 may have emission peaks in different wavelength bands. That is, the plurality of nano light-emitting bodies 120 disposed in the one wax particle 110 may include two selected from the blue nano light-emitting body, the green nano light-emitting body and the red nano light-emitting body. For example, the green nano light-emitting body and the red nano light-emitting body may be disposed in the wax particle 110 . In this case, the nanocomposite 100 a may be referred to as a multi-color nanocomposite.
- a diameter of the nanocomposite 100 a may be about 50 nm to about 30 ⁇ m.
- the diameter may be defined as a value (a hydrodynamic diameter) measured by a dynamic light scattering (DLS) method of calculating the diameter using a Stokes-Einstein equation related to a diffusion coefficient.
- DLS dynamic light scattering
- a nanocomposite 100 b may include the wax particle 110 , the at least one nano light-emitting body 120 , and an outer protective layer 130 . Since the nanocomposite 100 b is similar to the nanocomposite 100 a shown in FIG. 1A except that the outer protective layer 130 is further included, detailed overlapping description thereof will be omitted.
- a diameter of the nanocomposite 100 b may be about 50 nm to about 30 ⁇ m.
- the outer protective layer 130 is formed on a surface of the wax particle 110 to coat the wax particle 110 .
- the outer protective layer 130 is formed of silicon oxide (SiO x , 1 ⁇ x ⁇ 2).
- the outer protective layer 130 can prevent the nano light-emitting body 120 from being damaged due to moisture, heat, light, or the like, together with the wax particle 110 .
- the outer protective layer 130 may be formed through hydrolysis and a condensation reaction of a silicon oxide precursor material.
- the outer protective layer 130 may be formed by mixing the wax particle 110 in which the nano light-emitting bodies 120 are disposed, the silicon oxide precursor material, a catalyst material and water in an organic solvent and growing silicon oxide on the surface of the wax particle 110 .
- the outer protective layer 130 may include silica (SiO 2 ).
- Example of the silicon oxide precursor material may include triethoxysilane (HTEOS), tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS), dimethyldiethoxysilane, tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMOS), trimethoxysilane, dimethyldimethoxysilane, phenyltriethoxysilane (PTEOS), phenyltrimethoxysilane (PTMOS), diphenyldiethoxysilane, diphenyldimethoxysilane, or the like.
- HTEOS triethoxysilane
- TEOS tetraethoxysilane
- MTEOS methyltriethoxysilane
- TMOS tetramethoxysilane
- MTMOS methyltrimethoxysilane
- trimethoxysilane dimethyldimethoxysilane
- the silicon oxide precursor material may be synthesized using a halosilane, in particular, a chlorosilane, for example, trichlorosilane, methyltrichlorosilane, ethyltrichlorosilane, phenyltrichlorosilane, tetrachlorosilane, dichlorosilane, methyldichlorosilane, dimethyldichlorosilane, chlorotriethoxysilane, chlorotrimethoxysilane, chloromethyltriethoxysilane, chloroethyltriethoxysilane, chlorophenyltriethoxysilane, chloromethyltrimethoxysilane, chloroethyltrimethoxysilane, chlorophenyltrimethoxysilane, or the like, or may be synthesized using polysiloxane, polysilazane, or the like.
- a chlorosilane for example, trich
- Example of the organic solvent may include an alcoholic solvent such as methanol, ethanol, propanol, butanol, pentanol, hexanol, methyl cellosolve, butyl cellosolve, propylene glycol, diethylene glycol, or the like, or toluene. These organic solvents may be used alone or in combinations of two or more.
- an alcoholic solvent such as methanol, ethanol, propanol, butanol, pentanol, hexanol, methyl cellosolve, butyl cellosolve, propylene glycol, diethylene glycol, or the like, or toluene.
- An alkali material for example, ammonia (NH 3 ), may be used as the catalyst material.
- ammonia water NH 4 OH
- ammonia may be provided as a catalyst material in a process of forming the outer protective layer 130 .
- the outer protective layer 130 can coat a plurality of wax particles 110 .
- the outer protective layer 130 can coat at least two wax particles 110 adjacent to each other, and the silicon oxide may be filled in a space between the wax particles 110 to form the nanocomposite.
- the nanocomposite 100 b may be any one of the blue nanocomposite, the green nanocomposite and the red nanocomposite.
- the nanocomposite 100 b further includes the outer protective layer 130 in comparison with the nanocomposite 100 a described with reference to FIG. 1A , the nano light-emitting body 120 can be more stably protected from external moisture, heat, light, or the like.
- the wax layer 140 coats the outer protective layer 130 . That is, the wax layer 140 surrounds the wax particle 110 coated with the outer protective layer 130 .
- the wax layer 140 is formed of a wax-based compound. Since the wax-based compound that forms the wax layer 140 is substantially the same as the wax-based compound that forms the wax particle 110 , detailed overlapping description thereof will be omitted.
- FIG. 1C shows that the wax layer 140 coats the one wax particle 110 of which one surface is coated with the outer protective layer 130
- the wax layer 140 can coat two or more wax particles 110 .
- FIG. 1B describes that the outer protective layer 130 coats both of the first wax particle in which the first nano light-emitting body is disposed and the second wax particle in which the second nano light-emitting body is disposed
- the surface of the outer protective layer 130 may be coated with the wax layer 140 again.
- the wax layer 140 can coat at least two nanocomposites 100 b shown in FIG. 1B .
- the wax-based compound that forms the wax layer 140 fills a space between the neighboring nanocomposites 100 b , the one wax layer 140 can coat the at least two wax particles coated with the outer protective layer 130 .
- a nanocomposite 200 a includes a wax particle 210 , at least one nano light-emitting body 220 disposed in the wax particle 210 , and an inner protective layer 230 .
- the wax particle 210 is substantially the same as the wax particle 110 described with reference to FIG. 1A and the nano light-emitting body 220 is substantially the same as the nano light-emitting body 120 described with reference to FIG. 2 , detailed overlapping description thereof will be omitted.
- the one nano light-emitting body 220 may be coated with the one inner protective layer 230 .
- the inner protective layer 230 may be formed of silicon oxide.
- the silicon oxide that forms the inner protective layer 230 is substantially the same as the silicon oxide that forms the outer protective layer 130 described with reference to FIG. 1B , detailed overlapping description thereof will be omitted.
- the two or more nano light-emitting bodies 220 coated with the one inner protective layer 230 are referred to as an emission group
- at least two emission groups may be disposed in the one wax particle 210 .
- one emission group may include first nano light-emitting bodies
- the other emission group may include second nano light-emitting bodies having an emission peak in a different wavelength band from the first nano light-emitting bodies.
- each of the emission groups may include at least two nano light-emitting bodies having emission peaks in different wavelength bands.
- a diameter of the nanocomposite 200 a may be about 50 nm to about 30 ⁇ m.
- the nanocomposite 200 a since the nanocomposite 200 a has a structure secondarily encapsulated by the wax-based compound in a state in which at least one nano light-emitting body 220 is primarily encapsulated by the inner protective layer 230 , the nano light-emitting body 220 can be prevented from being damaged due to external heat, light, moisture, or the like.
- a nanocomposite 200 b may include the wax particle 210 , the at least one nano light-emitting body 220 , the inner protective layer 230 , and an outer protective layer 240 . Since the nanocomposite 200 b is similar to the nanocomposite 200 a described with reference to FIG. 3A except that the outer protective layer 240 is further included, detailed overlapping description thereof will be omitted.
- a diameter of the nanocomposite 200 b may be about 50 nm to about 30 ⁇ m.
- the outer protective layer 240 which may be formed of silicon oxide, coats the wax particle 210 . Since the outer protective layer 240 is substantially the same as the outer protective layer 130 described with reference to FIG. 1B , detailed overlapping description thereof will be omitted.
- the outer protective layer 240 can prevent the nano light-emitting body 220 from being damaged due to moisture, heat, light, or the like, together with the wax particle 210 and the inner protective layer 230 .
- FIG. 3B shows that the outer protective layer 240 coats the one wax particle 210
- the outer protective layer 240 can coat the plurality of wax particles 210 .
- the outer protective layer 240 can coat the two neighboring wax particles 210 , and the silicon oxide may be filled in the space between the wax particles 210 to form the nanocomposite.
- a nanocomposite 200 c may include a wax particle 210 , at least one nano light-emitting body 220 , an inner protective layer 230 , an outer protective layer 240 and a wax layer 250 . Since the nanocomposite 200 c is similar to the nanocomposite 200 b described with reference to FIG. 3B except that the wax layer 250 is further included, detailed overlapping description thereof will be omitted.
- a diameter of the nanocomposite 200 c may be about 50 nm to about 30 ⁇ m.
- the wax layer 250 can coat the outer protective layer 240 .
- the wax layer 250 is formed of a wax-based compound. Since the wax-based compound that forms the wax layer 250 is similar to the wax-based compound described with reference to FIG. 1A , detailed overlapping description thereof will be omitted.
- the nanocomposite 200 c encapsulates the wax particle 210 with the outer protective layer 240 and the wax layer 250 , the nano light-emitting body 220 can be prevented from being damaged due to external heat, light, moisture, or the like.
- a silicon oxide layer and a wax layer may be additionally and repeatedly deposited on the nanocomposite 200 c shown in FIG. 3C to manufacture the nanocomposite encapsulated with multiple layers.
- a wax (trade name: Licowax PED 136 wax, Clariant AG, Switzerland) serving as an oxidized high density polyethylene wax (an oxidized HDPE wax) having an acid value of about 50 mg KOH/g was used, and the particles distributed in the cooled solution included wax particles and red quantum dots disposed in the wax particles.
- the nanocomposite solution was centrifugally separated using a high speed centrifugal separator at about 5,000 rpm for about 30 minutes to separate the nanocomposite and the separated nanocomposite was cleaned using ethanol and distilled water, and the ethanol and the distilled water were removed using an evaporator to manufacture a nanocomposite 1 in a powder phase.
- the nanocomposite solution manufactured through the first and second steps described in ‘Manufacture of the nanocomposite—1’ was added to the wax solution including the wax-based compound.
- a nanocomposite 2 in a powder phase having a wax layer formed on a surface of the silicon oxide layer was manufactured.
- the toluene solution in which the quantum dots coated with the silicon oxide layers were distributed was mixed with the wax solution manufactured by increasing the temperature to about 150° C. and dissolving the wax-based compound, and then the toluene solution was cooled to room temperature and the toluene was removed to manufacture a nanocomposite 3 in a powder phase.
- the nanocomposite manufactured through ‘Manufacture of nanocomposite—3’ was mixed with the solution in which 10 ml of ethanol and 1 ml of TEOS were mixed, and 2.5 ml of ammonia water having a concentration of 30% was added.
- the solution was centrifugally separated using the high speed centrifugal separator at about 5,000 rpm for about 30 minutes to separate the nanocomposite, and the nanocomposite was cleaned using ethanol and distilled water.
- the ethanol and the distilled water were removed using the evaporator to manufacture a nanocomposite 4 in a powder phase.
- the nanocomposites 1 to 4 in the powder phase were prepared through the above-mentioned methods, and first quantum efficiency (QYT1, unit: %) thereof was measured using an absolute quantum efficiency measurement device (trade name: C9920-02, HAMAMATSU Photonics K. K., Japan).
- first quantum efficiency QYT1, unit: % thereof was measured using an absolute quantum efficiency measurement device (trade name: C9920-02, HAMAMATSU Photonics K. K., Japan).
- second quantum efficiency QYT2, unit: %) was measured.
- a difference ( ⁇ QY1 QYT1 ⁇ QYT2, unit: %) between the first quantum efficiency and the second quantum efficiency was calculated to estimate ultraviolet light stability with respect to each of the nanocomposites 1 to 4. The result is shown in Table 1.
- the nanocomposites 1 to 4 in the powder phase were prepared to measure first quantum efficiency (QYT1, unit: %), and then were left in a thermo-hygrostat under severe conditions of a temperature 85° C. and a relative humidity 85% for 480 hours.
- third quantum efficiency (QYT3, unit: %) of the nanocomposites 1 to 4 after being left under the severe conditions were measured.
- the ultraviolet light stability with respect to the nanocomposites 1 to 4 is 6.7% or less, and the heat/moisture stability is 7.3% or less.
- a small value in the variation ( ⁇ QY1) of the quantum efficiency due to the ultraviolet light radiation under severe conditions indicates improved stability with respect to the ultraviolet light.
- a small value in the variation ( ⁇ QY2) of the quantum efficiency due to severe conditions of a high temperature and a high humidity indicates improved stability with respect to the heat and moisture.
- the nanocomposites including both of the wax particle and the silicon oxide like the nanocomposites 1 to 4 have improved ultraviolet light stability and heat/moisture stability.
- FIGS. 4A and 4B are views for describing an optical member according to the embodiment of the present invention.
- the first optical layer 520 may be formed on one surface of the base substrate 510 , i.e., the light incidence surface or the light emission surface.
- the first optical layer 520 is formed of a polymer resin and the first nanocomposite CX 1 .
- the polymer resin is a matrix material of the first optical layer 520 , and the first nanocomposite CX 1 is distributed in the polymer resin.
- the first nanocomposite CX 1 includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- the first nanocomposite CX 1 may have substantially the same structure as the nanocomposite 100 a described with reference to FIG. 1A .
- the first nanocomposite CX 1 distributed in the first optical layer 520 may include one kind selected from the blue, green and red nanocomposites.
- the light passing through the first optical layer 520 may have an emission spectrum in only one wavelength band among the blue, green and red wavelength bands.
- the first nanocomposite CX 1 distributed in the first optical layer 520 may include at least two kinds among the blue, green and red nanocomposites.
- the first nanocomposite CX 1 distributed in the first optical layer 520 may be constituted by a plurality of green nanocomposites and a plurality of red nanocomposites.
- the first nanocomposite CX 1 distributed in the first optical layer 520 may include a multi-color nanocomposite.
- the multi-color nanocomposite which is the first nano light-emitting bodies disposed in the first wax particle, may include at least two kinds selected from the blue, green and red nano light-emitting bodies.
- the multi-color nanocomposite may include the green nano light-emitting body and the red nano light-emitting body.
- an optical layer including the diffusion beads may be formed on the base substrate 510 as a separate layer from the first optical layer 520 .
- the optical layer including the diffusion beads may be formed on one surface of the base substrate 510 on which the first optical layer 520 is formed, or the other surface opposite to the one surface.
- optical member 502 described with reference to FIG. 4B is similar to the optical member 501 described with reference to FIG. 4A except that the second optical layer 530 is further included, detailed overlapping description thereof will be omitted.
- the second wax particle is formed of a wax-based compound.
- the at least one second nano light-emitting body is disposed in the second wax particle. Since the second nanocomposite CX 2 is substantially the same as the first nanocomposite CX 1 described with reference to FIG. 4A , detailed overlapping description will be omitted.
- the first nanocomposites CX 1 and the second second nanocomposites CX 2 may have emission peaks in different wavelength bands.
- the second nanocomposite CX 2 may be excited by the part of the light generated from the first nanocomposite CX 1 as well as the light provided by the light source. That is, the second nanocomposite CX 2 may receive sufficient light from the first nanocomposite CX 1 and the light source to be excited.
- the first nanocomposite CX 1 can receive higher energy from the light source than the second optical layer 530 , and thus power density of the light generated from the first nanocomposite CX 1 can be maximized.
- the first nanocomposite CX 1 may be a green nanocomposite
- the second nanocomposite CX 2 may be a red nanocomposite
- the first nanocomposite CX 1 may include at least two kinds of nanocomposites, and the second nanocomposite CX 2 may include one kind of nanocomposite.
- the first nanocomposite CX 1 may include a green nanocomposite and a red nanocomposite, and the second nanocomposite CX 2 may include a green nanocomposite.
- the first nanocomposite CX 1 and/or the second nanocomposite CX 2 may include a multi-color nanocomposite.
- the multi-color nanocomposite may include a green nano light-emitting body and a red nano light-emitting body.
- the optical member 502 may further include a third optical layer including a third nanocomposite.
- the third optical layer may be formed on the first optical layer 520 .
- an optical pattern may be formed on the third optical layer.
- the second optical layer 530 may be omitted.
- FIGS. 4C to 4G are views for describing various shapes of the optical pattern.
- the optical pattern formed on the surface of the first optical layer 520 may be a continuous pattern 520 a .
- the continuous pattern 520 a may have a shape in which a plurality of convex sections are continuously connected. Each of the convex sections protrudes in a direction from the base substrate 510 toward the outside of the optical member 502 . Heights or widths of the convex sections may be different from each other and may have irregular values.
- the optical pattern formed on the surface of the first optical layer 520 may have a shape in which a plurality of concave sections are continuously connected.
- Each of the concave sections is recessed in a direction from the surface of the optical member 502 toward the inside of the optical member 502 . Depths or widths of the concave sections may be appropriately adjusted according to necessity, and depths or widths of the concave sections may have irregular values.
- the continuous pattern 520 a may have a shape in which the concave sections and the convex sections are combined, or may be an embossing pattern. The continuous pattern 520 a may function as a light diffusion pattern.
- the continuous pattern 520 a may include a plurality of segments as shown in FIG. 4D .
- FIG. 4D is a plan view for describing the segments.
- the continuous pattern 520 a may include convex sections formed to correspond to the plurality of segments having irregular planar shapes, which are irregularly arranged. Heights, planar shapes and surface areas of the convex sections are not particularly limited, and the heights or surface areas of the convex sections may have irregular values. While not shown, the continuous pattern 520 a may include concave sections formed to correspond to the plurality of segments having irregular planar shapes, which are irregularly arranged.
- the optical pattern formed on the surface of the first optical layer 520 may be a discontinuous convex pattern 520 b .
- the convex sections may be disposed apart from each other.
- the convex sections that constitute the discontinuous convex pattern 520 b may have dot shapes when seen in a plan view. Heights or widths of the convex sections may be different from each other, and may have irregular values.
- the optical pattern formed on the surface of the first optical layer 520 may be a discontinuous concave pattern 520 c .
- the concave sections may be disposed apart from each other.
- the discontinuous concave pattern 520 c may have dot shapes when seen in a plan view. Depths or widths of the concave sections may be different from each other, and depths or widths of the concave sections may have irregular values.
- the optical pattern formed on the surface of the first optical layer 520 may be a light collection pattern 520 d .
- the light collection pattern 520 d includes a plurality of protrusions, and a cross-section of each of the protrusions may have a triangular shape.
- the protrusions may be continuously arranged in a first direction substantially parallel to a cut surface that defines a cross-section of the triangular shape.
- each of the protrusions may extend in a second direction perpendicular to the cross-section to have a predetermined height. That is, each of the protrusions may have a triangular column shape having the predetermined height.
- a height of each of the protrusions may vary in the second direction.
- the height of each of the protrusions may vary linearly or non-linearly in the second direction.
- the height of each of the protrusions may vary in a predetermined period, or may vary irregularly.
- the heights of the protrusions may vary independently.
- a vertex angle of each of the protrusions that constitutes the light collection pattern may be about 90°, but may be appropriately adjusted according to necessity.
- the vertex angle of each of the protrusions may vary according to the position thereof.
- the shapes may also be applied to the optical pattern formed on the second optical layer 530 .
- the optical pattern formed on the first optical layer 520 and the optical pattern formed on the second optical layer 530 may be the same as or different from each other.
- each of the optical members 501 and 502 described with reference to FIGS. 4A and 4B may further include a light diffusion layer, on which the optical pattern described with reference to FIGS. 4C to 4G is formed, formed on the first optical layer 520 .
- the light diffusion layer on which the optical pattern described with reference to FIGS. 4C to 4G is formed may be formed on the other surface of the base substrate 510 .
- the nanocomposite including the nano light-emitting body coated with the wax particles may be applied to the at least one optical layer of the optical members 501 and 502 .
- the optical members 501 and 502 are included in the display device, a color gamut of the display device can be widened, and color purity of the color displayed on the display device can be improved.
- the wax particle included in the nanocomposite protects the nano light-emitting body from heat, moisture or ultraviolet light
- the optical members 501 and 502 can be stable with respect to the heat, moisture or ultraviolet light without a separate protective layer to protect the optical layer including the nanocomposite.
- the optical members 501 and 502 may be used as a light guide plate, a diffusion sheet, a prism sheet, or the like. Unlike this, the optical members 501 and 502 may be used as an optical sheet which is additionally inserted, in addition to the optical sheets generally applied to a backlight unit for a display device.
- FIGS. 5A to 5I are views for describing embodiments of the diffusion sheet according to the present invention.
- a diffusion sheet 1001 includes a base substrate 1100 , and a first optical layer 1200 including a first nanocomposite CX 1 .
- the base substrate 1100 is formed of a transparent material. Since the transparent material is substantially the same as described with reference to FIG. 4A , detailed overlapping description will be omitted.
- the first optical layer 1200 is formed on one surface of the base substrate 1100 .
- the surface on which the first optical layer 1200 is formed may be the plane of light emission or may be the plane of light incidence.
- the first nanocomposite CX 1 distributed in the first optical layer 1200 includes a first wax particle and at least one first nano light-emitting body.
- the first nano light-emitting body is disposed in the first wax particle and coated with the first wax particle.
- the first nanocomposite CX 1 may have any one of structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C.
- the first nanocomposite CX 1 may include at least one kind among the blue nanocomposite, the green nanocomposite and the red nanocomposite.
- the first nanocomposite CX 1 may include a green nanocomposite or a red nanocomposite.
- the first nanocomposite CX 1 may include a plurality of green nanocomposites and a plurality of red nanocomposites.
- the first nanocomposite CX 1 may include a multi-color nanocomposite.
- the multi-color nanocomposite may include both a red nano light-emitting body and a green nano light-emitting body.
- the first optical layer 1200 includes a light diffusion pattern 1210 formed on a surface thereof. Since the light diffusion pattern 1210 is substantially the same as the continuous pattern 520 a described with reference to FIG. 4C , detailed overlapping description will be omitted. Unlike this, the light diffusion pattern 1210 may be the discontinuous convex pattern 520 b described with reference to FIG. 4E or the discontinuous concave pattern 520 c described with reference to FIG. 4F .
- a diffusion sheet 1002 includes a base substrate 1100 , a first optical layer 1200 and a second optical layer 1300 .
- the first optical layer 1200 is formed on one surface of the base substrate 1100 , and includes a first nanocomposite CX 1 .
- the first nanocomposite CX 1 includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle. Since the first optical layer 1200 is substantially the same as described with reference to FIG. 5A , detailed overlapping description thereof will be omitted.
- the second optical layer 1300 is formed on the other surface opposite to the one surface on which the first optical layer 1200 is formed, and includes a second nanocomposite CX 2 .
- the second nanocomposite CX 2 includes a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle.
- the second nanocomposite CX 2 may have any one of structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C.
- the second nanocomposite CX 2 and the first nanocomposite CX 1 may have the same structure or different structures.
- the second nanocomposite CX 2 may have the structure described with reference to FIG. 3A .
- the first and second nanocomposites CX 1 and CX 2 may both have the same structure described with reference to FIG. 1B .
- the second nanocomposite CX 2 may include at least one kind among the blue nanocomposite, the green nanocomposite and the red nanocomposite.
- the second nanocomposite CX 2 may include a green nanocomposite or a red nanocomposite.
- the second nanocomposite CX 2 may include a plurality of green nanocomposites and a plurality of red nanocomposites.
- the second nanocomposite CX 2 may include a multi-color nanocomposite.
- the second nanocomposite CX 2 may have an emission peak in a different wavelength band from a wavelength band to which the emission peak of the first nanocomposite CX 1 belongs.
- FWHM at the emission peak of the first nanocomposite CX 1 may be about 70 nm or less.
- the FWHM may be about 50 nm or less, and more preferably, about 40 nm or less.
- the FWHM may be similarly applied to the second nanocomposite CX 2 .
- the second nanocomposite CX 2 may include a red nanocomposite.
- the second nanocomposite CX 2 may further include a green nanocomposite.
- the second nanocomposite CX 2 may include a multi-color nanocomposite including a green nano light-emitting body and a red nano light-emitting body.
- the second optical layer 1300 includes a light diffusion pattern 1310 formed on a surface thereof. Since the light diffusion pattern 1310 is substantially the same as the continuous pattern 520 a described with reference to FIG. 4C , detailed overlapping description thereof will be omitted. Unlike this, the light diffusion pattern 1310 may be the same as the discontinuous convex pattern 520 b described with reference to FIG. 4E or discontinuous concave pattern 520 c described with reference to FIG. 4F .
- FIG. 5B shows that the light diffusion pattern 1310 of the second optical layer 1300 is a continuous pattern having substantially the same structure as the light diffusion pattern 1210 of the first optical layer 1200 , the light diffusion patterns 1210 and 1310 may be continuous patterns having different structures from each other.
- the first optical layer 1200 is formed on one surface of the base substrate 1100 , and includes a first nanocomposite CX 1 . Since the first optical layer 1200 is substantially the same as described with reference to FIG. 5A , detailed overlapping description thereof will be omitted.
- the second optical layer 1302 is formed on the other surface opposite to the one surface of the base substrate 1100 on which the first optical layer 1200 is formed, and includes a second nanocomposite CX 2 . Since the second optical layer 1302 is substantially the same as described with reference to FIG. 5B except that the surface of the second optical layer 1302 is a flat surface, detailed overlapping description thereof will be omitted. While the second optical layer 1302 is shown to have the flat surface, the second optical layer 1301 may further include the light diffusion pattern 1310 , which is substantially the same as described with reference to FIG. 5B .
- the intermediate layer 1400 is disposed between the first and second optical layers 1200 and 1302 , and includes a third nanocomposite CX 3 .
- the intermediate layer 1400 may be disposed between the base substrate 1100 and the second optical layer 1302 .
- the third nanocomposite CX 3 includes a third wax particle, and at least one nano light-emitting body disposed in the third wax particle.
- the third nanocomposite CX 3 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C.
- the third nanocomposite CX 3 may include at least one kind among the blue nanocomposite, the green nanocomposite and the red nanocomposite.
- the third nanocomposite CX 3 may include a multi-color nanocomposite.
- the third nanocomposite CX 3 may have an emission peak in a wavelength band different from the emission peaks of the first and second nanocomposites CX 1 and CX 2 .
- the first nanocomposite CX 1 may include a blue nanocomposite
- the second nanocomposite CX 2 may include a red nanocomposite
- the third nanocomposite CX 3 may include a green nanocomposite.
- third nanocomposite CX 3 may further include a red nanocomposite in addition to the green nanocomposite.
- a diffusion sheet 1004 includes a base substrate 1100 , a first optical layer 1200 , a second optical layer 1302 and an intermediate layer 1402 .
- the first optical layer 1200 is formed on one surface of the base substrate 1100 , and includes a first nanocomposite CX 1 . Since the base substrate 1100 and the first optical layer 1200 are substantially the same as described with reference to FIG. 5A , detailed overlapping description thereof will be omitted.
- the second optical layer 1302 is formed on the other surface opposite to the one surface of the base substrate 1100 , and includes a second nanocomposite CX 2 . Since the second optical layer 1302 is substantially the same as described with reference to FIG. 5C except that the second optical layer 1302 is directly formed on the base substrate 1100 , detailed overlapping description thereof will be omitted.
- the intermediate layer 1402 is formed between the base substrate 1100 and the first optical layer 1200 .
- the intermediate layer 1402 includes a third nanocomposite CX 3 . Since the intermediate layer 1402 is substantially the same as the intermediate layer 1400 described with reference to FIG. 5C except for a disposition position, detailed overlapping description thereof will be omitted.
- the first optical layer 1202 is formed on one surface of the base substrate 1100 , and includes a first nanocomposite CX 1 . Since the first optical layer 1202 is substantially the same as the first optical layer 1200 described with reference to FIG. 5A except that a surface of the first optical layer 1202 is a flat surface, detailed overlapping description thereof will be omitted.
- the light diffusion layer 1500 is formed on the other surface opposite to the one surface of the base substrate 1100 on which the first optical layer 1202 is formed.
- the light diffusion layer 1500 includes a light diffusion pattern 1510 formed on a surface thereof.
- the light diffusion pattern 1510 may be a pattern that is substantially the same as the continuous pattern 520 a described with reference to FIG. 4C . Unlike this, the light diffusion pattern 1510 may be any one of the discontinuous convex pattern 520 b described with reference to FIG. 4E and the discontinuous concave pattern 520 c described with reference to FIG. 4F .
- the light diffusion layer 1500 may not include a nanocomposite but function simply to diffuse light.
- FIG. 5E shows that a surface of the first optical layer 1202 is a flat surface
- the optical pattern described with reference to FIGS. 4C , and 4 E to 4 G may also be formed on the surface of the first optical layer 1202 .
- a diffusion sheet 1006 according to another embodiment of the present invention includes a base substrate 1100 , a first optical layer 1204 and a light diffusion layer 1500 .
- the first optical layer 1204 is substantially the same as the first optical layer 1202 described with reference to FIG. 5E except that the first optical layer 1204 is disposed between the base substrate 1100 and the light diffusion layer 1500 . Accordingly, detailed overlapping description thereof will be omitted.
- the light diffusion layer 1500 is formed on the first optical layer 1204 .
- the light diffusion layer 1500 is a layer that does not include a nanocomposite but serves simply to diffuse light. Since the light diffusion layer 1500 is substantially the same as described with reference to FIG. 5E , detailed overlapping description thereof will be omitted.
- a diffusion sheet 1008 includes a base substrate 1100 , a first optical layer 1204 , a second optical layer 1302 , a first light diffusion layer 1500 and a second light diffusion layer 1600 .
- the diffusion sheet 1008 is substantially the same as the diffusion sheet 1007 described with reference to FIG. 5G except that the second light diffusion layer 1600 is further included, detailed overlapping description thereof will be omitted.
- the first light diffusion layer 1500 of FIG. 5H is the same layer as the light diffusion layer of FIG. 5G , and serves to diffuse light.
- a diffusion sheet 1009 according to another embodiment of the present invention includes a base substrate 1100 , a first optical layer 1200 and a light collecting layer 1700 .
- the light collecting layer 1700 is formed on the other surface opposite to the one surface of the first optical layer 1200 .
- the light collecting layer 1700 includes a light collection pattern 1710 formed on a surface thereof. Since the light collection pattern 1710 is substantially the same as the optical pattern described with reference to FIG. 4G , detailed overlapping description thereof will be omitted.
- the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C may be variously applied to the diffusion sheet. Since the diffusion sheet according to the present invention can convert the light provided from the light source to provide the light to a display panel using the nanocomposite, color purity and color reproducibility of the display device can be improved.
- FIGS. 6A to 6D are views for describing embodiments of a light collection sheet according to the present invention.
- a light collection sheet 2001 includes a base substrate 2100 , a light collecting layer 2200 and a first optical layer 2300 .
- the base substrate 2100 is formed of a transparent material.
- the transparent material is substantially the same as the transparent material that forms the base substrate 1100 of the diffusion sheet 1001 described with reference to FIG. 5A . Accordingly, detailed overlapping description thereof will be omitted.
- the light collecting layer 2200 is formed on one surface of the base substrate 2100 .
- the light collecting layer 2200 includes a light collection pattern 2210 formed on a surface thereof.
- the light collection pattern 2210 may be substantially the same as the optical pattern described with reference to FIG. 4G .
- the light collection pattern 2210 is formed to have a cross-sectional shape such that the light entering from the base substrate 2100 is refracted in a vertical direction. Since the cross-sectional shape is the same as the shape described with reference to FIG. 4G , detailed overlapping description thereof will be omitted.
- the first optical layer 2300 is formed on the other surface opposite to the one surface on which the light collecting layer 2200 is formed.
- the first optical layer 2300 includes a first nanocomposite CX 1 .
- the first nanocomposite CX 1 includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- the first nanocomposite CX 1 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C.
- the first nanocomposite CX 1 may include at least one kind selected from the blue, green and red nanocomposites.
- the first nanocomposite CX 1 may include a multi-color nanocomposite.
- the first optical layer 2300 may include an optical pattern formed on a surface thereof.
- the optical pattern may have any one of the structures described with reference to FIGS. 4C to 4F . Accordingly, detailed overlapping description thereof will be omitted.
- the light collection sheet 2001 may further include a second optical layer disposed between the first optical layer 2300 and the base substrate 2100 , or between the light collecting layer 2200 and the base substrate 2100 .
- the second optical layer may include a second nanocomposite including a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle.
- a light collection sheet 2002 includes a base substrate 2100 , a first optical layer 2300 and a light collecting layer 2200 .
- the light collection sheet 2002 is substantially the same as the light collection sheet 2001 described with reference to FIG. 6A except that the first optical layer 2300 is disposed between the base substrate 2100 and the light collecting layer 2200 . Accordingly, detailed overlapping description thereof will be omitted.
- the light collection sheet 2002 may further include a second optical layer disposed between the first optical layer 2300 and the base substrate 2100 .
- the second optical layer may include a second nanocomposite.
- a light collection sheet 2003 includes a base substrate 2100 and a light collecting layer 2202 .
- the light collecting layer 2202 is formed on one surface of the base substrate 2100 , and includes a first nanocomposite CX 1 .
- the light collecting layer 2202 has the light collection pattern 2210 formed on a surface thereof. Since the first nanocomposite CX 1 is substantially the same as described with reference to FIG. 6A , detailed overlapping description thereof will be omitted.
- the light collection sheet 2003 may further include an optical layer formed on the other surface opposite to the one surface on which the light collecting layer 2202 is formed, or formed between the base substrate 2100 and the light collecting layer 2202 .
- the optical layer may include a second nanocomposite.
- a light collection sheet 2004 includes a base substrate 2100 , a light collecting layer 2202 in which the first nanocomposite CX 1 is distributed, and a first optical layer 2400 .
- the light collection sheet 2004 is substantially the same as the light collection sheet 2003 described with reference to FIG. 6C except that the first optical layer 2400 is further included. Accordingly, detailed overlapping description thereof will be omitted.
- the first optical layer 2400 is formed on the other surface opposite to the one surface of the base substrate 2100 on which the light collecting layer 2202 is formed.
- the first optical layer 2400 includes a light diffusion pattern 2410 formed on a surface thereof. Since the light diffusion pattern 2410 is substantially the same as the continuous pattern 520 a described with reference to FIG. 4C , detailed overlapping description thereof will be omitted. Unlike this, the light diffusion pattern 2410 may be the same pattern as the optical pattern described with reference to FIGS. 4E and 4F .
- the light collection sheet 2004 may further include a second optical layer formed between the base substrate 2100 and the first optical layer 2400 .
- the second optical layer may include a second nanocomposite.
- the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C may be variously applied to the light collection sheet. Since the light collection sheet according to the present invention can convert the light provided from the light source to provide the light to the display panel using the nanocomposite, color purity and color reproducibility of the color displayed on the display device can be improved.
- FIGS. 7A to 7C are views for describing embodiments of a light guide plate according to the present invention.
- a light guide plate 3001 according to the embodiment of the present invention includes a base substrate 3100 , a light emitting pattern 3200 and a first optical layer 3300 .
- the base substrate 3100 is formed of a transparent material.
- the transparent material may be, for example, a polymethylmethacrylate (PMMA) resin, a polycarbonate (PC) resin, or the like, but it is not limited thereto.
- the first optical layer 3300 is formed on the other surface opposite to the one surface on which the light emitting pattern 3200 is formed. That is, a section of the base substrate 3100 on which the first optical layer 3300 is formed may be a light exiting section of the light guide plate 3001 .
- the first optical layer 3300 includes a first nanocomposite CX 1 .
- the first nanocomposite CX 1 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C. Simultaneously, the first nanocomposite CX 1 may include at least one selected from the blue, green and red nanocomposites. Unlike this, the first nanocomposite CX 1 may include a multi-color nanocomposite. While not shown, the first optical layer 3300 may have substantially the same pattern as the light emitting pattern 3200 .
- FIG. 7A shows that only the first optical layer 3300 is formed on one surface of the base substrate 3100
- a second optical layer including a second nanocomposite may be formed between the base substrate 3100 and the first optical layer 3300 .
- the second optical layer may be formed between the light emitting pattern 3200 and the base substrate 3100 .
- a light guide plate 3002 includes a base substrate 3100 , a light emitting pattern 3210 , and a first optical layer 3300 in which the first nanocomposite CX 1 is distributed.
- the light guide plate 3002 is substantially the same as the light guide plate 3001 described with reference to FIG. 7A except that the light emitting pattern 3210 includes the second nanocomposite CX 2 . Accordingly, detailed overlapping description thereof will be omitted. While not shown, the first optical layer 3300 may further include substantially the same pattern as the light emitting pattern described with reference to FIG. 7A .
- the light emitting pattern 3210 includes the second nanocomposite CX 2 .
- the second nanocomposite CX 2 includes a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle.
- the second nanocomposite CX 2 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C. Simultaneously, the second nanocomposite CX 2 may include at least one kind among the blue, green and red nanocomposites, or may include a multi-color nanocomposite. The second nanocomposite CX 2 may have a different emission peak from the emission peak of the first nanocomposite CX 1 . For example, the second nanocomposite CX 2 may include a green nanocomposite, and the first nanocomposite CX 1 may include a red nanocomposite.
- a light guide plate 3003 according to another embodiment of the present invention includes a base substrate 3100 and a light emitting pattern 3200 .
- the light emitting pattern 3200 is substantially the same as described with reference to FIG. 7A
- the base substrate 3100 includes the first nanocomposite CX 1 .
- the first nanocomposite CX 1 is substantially the same as described with reference to FIG. 7A .
- an optical layer including a second nanocomposite may be formed on the other surface opposite to the one surface of the base substrate 3100 on which the light emitting pattern 3200 is formed. Unlike this, the optical layer may be formed between the base substrate 3100 and the light emitting pattern 3200 .
- FIGS. 8 and 9 are views for describing a backlight unit according to an embodiment of the present invention.
- a backlight unit 5001 includes a light source 5100 , a light guide plate 5200 , a reflective plate 5300 , a diffusion sheet 5400 , a first light collection sheet 5510 and a second light collection sheet 5520 .
- a white light emitting module or a blue light emitting module may be used as the light source 5100 .
- the white light emitting module may include a blue light emitting chip configured to generate blue light, and a photoconversion layer configured to coat the blue light emitting chip. That is, since the photoconversion layer absorbs and/or converts blue light generated from the blue light emitting chip, the white light emitting module can finally generate white light.
- the photoconversion layer may include a phosphor including yttrium aluminum garnet (YAG) or the like, or a nano light-emitting body including quantum dots or the like. Green quantum dots may be used as the nano light-emitting body.
- the photoconversion layer may include the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C.
- the blue light emitting module includes a blue light emitting chip configured to generate blue light. That is, an observer can see the blue light emitted from the blue light emitting chip of the blue light emitting module as it is.
- the light guide plate 5200 may be disposed adjacent to the light source 5100 , the light generated from the light source 5100 may enter the light guide plate 5200 , and the light emitted from the light guide plate 5200 may enter the diffusion sheet 5400 .
- the light guide plate 5200 may include any one of the light guide plates 3001 , 3002 and 3003 according to the present invention described with reference to FIGS. 7A to 7C .
- the reflective plate 5300 is disposed to face a lower section of the light guide plate 5200 , i.e., a reflective section of the light guide plate 5200 , and the light emitted through the reflective section of the light guide plate 5200 is reflected again toward the light guide plate 5200 to increase use efficiency of the light.
- the diffusion sheet 5400 is disposed on the light guide plate 5200 , and the light emitted from the light guide plate 5200 can be diffused.
- the diffusion sheet 5400 may include any one of diffusion sheets 1001 to 1009 described with reference to FIGS. 5A to 5I .
- the first light collection sheet 5510 is disposed on the diffusion sheet 5400 , and a light collection pattern including a plurality of protrusions described with reference to FIG. 4G is formed on an upper surface of the first light collection sheet 5510 .
- the second light collection sheet 5520 is disposed on the first light collection sheet 5510 , and a plurality of protrusions having substantially the same shape as the protrusions formed on the first light collection sheet 5510 are formed on an upper surface of the second light collection sheet 5520 .
- a longitudinal direction of the protrusions formed at the first light collection sheet 5510 may cross a longitudinal direction of the protrusions formed on the second light collection sheet 5520 at a predetermined angle.
- a crossing angle of the longitudinal directions of the protrusions may be about 90°.
- At least one of the first and second light collection sheets 5510 and 5520 may include any one selected from the light collection sheets 2001 to 2004 described with reference to FIGS. 6A to 6D .
- the white light emitting module when used as the light source 5100 , at least one of the light guide plate 5200 , the diffusion sheet 5400 , and the first and second light collection sheets 5510 and 5520 may include a green nanocomposite and/or a red nanocomposite. Even when color purity of the light generated from the white light emitting module is low, the green nanocomposite and/or the red nanocomposite may be applied to at least one of the light guide plate 5200 , the diffusion sheet 5400 , and the first and second light collection sheets 5510 and 5520 to improve color purity of the white light provided by the backlight unit 5001 .
- a deviation in color coordinates is generated between the light emitted from the light entering section adjacent to the light source and the light emitted from an opposite section of the light guide plate 5200 opposite to the light entering section while passing through the light guide plate 5200 , the diffusion sheet 5400 , the first and second light collection sheets 5510 and 5520 , in particular, the light guide plate 5200 .
- the deviation in color coordinates is generated because light of a specific wavelength is relatively largely scattered while the light moves from the light entering section to the opposite section, the observer recognizes the deviation in color coordinates as a yellowish problem in the opposite section.
- the blue light emitting module when used as the light source 5100 , at least one of the light guide plate 5200 , the diffusion sheet 5400 , and the first and second light collection sheets 5510 and 5520 may include a green nanocomposite and a red nanocomposite. That is, even when the light source 5100 generates blue light, since the green nanocomposite and the red nanocomposite generate green light and red light, the observer can recognize the light generated by the backlight unit 5001 as white light.
- At least one of the light guide plate 5200 , the diffusion sheet 5400 , and first and second light collection sheets 5510 and 5520 may include a green nanocomposite, a red nanocomposite and a blue nanocomposite.
- any one of the light guide plate 5200 , the diffusion sheet 5400 , and first and second light collection sheets 5510 and 5520 may include all of the green, red and blue nanocomposites.
- the diffusion sheet 5400 may include a blue nanocomposite
- the first light collection sheet 5510 may include a green nanocomposite
- the second light collection sheet 5520 may include a red nanocomposite.
- any one of the light guide plate 5200 , the diffusion sheet 5400 , and first and second light collection sheets 5510 and 5520 may include two kinds of nanocomposites among the green, red and blue nanocomposites, and another of the light guide plate 5200 , the diffusion sheet 5400 , and first and second light collection sheets 5510 and 5520 may include one kind of nanocomposite.
- the diffusion sheet 5400 may include a blue nanocomposite
- the first light collection sheet 5510 may include green and red nanocomposites.
- the backlight unit 5001 can provide white light to the display panel.
- a backlight unit 5002 includes a light source 5100 , a light guide plate 5200 , a reflective plate 5300 , an optical sheet 5600 , a diffusion sheet 5400 , a first light collection sheet 5510 and a second light collection sheet 5520 . Since the backlight unit 5002 is substantially the same as the backlight unit 5001 described with reference to FIG. 8 except that the optical sheet 5600 is further included, detailed overlapping description thereof will be omitted.
- the optical sheet 5600 includes the nanocomposite, and is additionally included in the backlight unit 5002 independently from the light guide plate 5200 , the diffusion sheet 5400 , the first light collection sheet 5510 and the second light collection sheet 5520 .
- the light guide plate 5200 , the diffusion sheet 5400 , the first light collection sheet 5510 and the second light collection sheet 5520 those conventionally used in the art may be used. That is, as only the optical sheet 5600 including the nanocomposites described with reference to FIGS. 1A to 1C and 3 A to 3 C is inserted into the backlight unit 5002 , a color gamut of the display device can be increased to improve color reproducibility.
- the backlight units 5001 and 5002 can provide a color filter of the display panel with light having high color purity, and can widen a color gamut of the display device to improve color reproducibility.
- a blue light emitting module having an emission peak at about 444 nm was used as a light source, and a light guide plate, a diffusion sheet, a first light collection sheet and a second light collection sheet were manufactured through the following methods and prepared.
- wax (trade name: Licowax PED 136 wax, Clariant Gmbh., Switzerland), which is oxidized high density polyethylene wax (oxidized HDPE Wax) serving as wax-based compound, having an acid value of about 30 mg KOH/g was mixed with 1 ml of toluene, a temperature of the wax was raised to about 150° C. and the wax-based compound was dissolved to manufacture a wax solution.
- oxidized HDPE Wax oxidized high density polyethylene wax
- a temperature of the wax was raised to about 150° C. and the wax-based compound was dissolved to manufacture a wax solution.
- a solution in which about 20 mg of a CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co.
- the first coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 ⁇ m to form a light diffusion layer having a shape shown in FIG. 4C on a surface thereof.
- An average thickness of the light diffusion layer was about 50 ⁇ m.
- a solution in which about 20 mg of a CdSe-based green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was added into and mixed with the wax solution prepared in the process of manufacturing the red nanocomposite, and the solution was cooled to room temperature to be mixed with the urethane acrylate and photoinitiator.
- the toluene was removed using the evaporator to manufacture a second coating composition in which the urethane acrylate, the photoinitiator and a green nanocomposite were mixed.
- the second coating composition was applied as a coating and cured on an opposite surface of the base substrate on which the light diffusion layer was formed to form an optical layer.
- a thickness of the optical layer was about 50 ⁇ m.
- a diffusion sheet including the base substrate, the light diffusion layer and the optical layer was manufactured.
- a catalyst (tetra-n-butylphosphoniumbromide) purchased from Nippon Industries Co. Ltd. (corporate name, Japan) was mixed at 0.07 wt % with bis(2,3-epithiopropyl)sulfide at 100 wt %, and the solution was agitated to manufacture a uniformized solution.
- the uniformized solution was agitated and defoamed, and then filtered through a polytetrafluroroethylene membrane (a PTFE membrane) having a thickness of about 0.5 ⁇ m to manufacture a base material.
- the base material was applied on a PET film having a thickness of about 75 ⁇ m and pressed by a forming roller to manufacture a light collection pattern having a height of about 25 ⁇ m on the PET film, thereby manufacturing a first light collection sheet.
- a second light collection sheet was manufactured through substantially the same process as the method of manufacturing the first light collection sheet.
- the light guide plate, the diffusion sheet, the first light collection sheet and the second light collection sheet which were manufactured through the methods described above, were sequentially deposited to assemble a blue light emitting module, and thus a backlight unit according to Embodiment 1 of the present invention was prepared.
- YAG phosphor purchased from Nichia Corporation (corporate name, Japan) was applied on a blue light emitting chip representing an emission peak at about 444 nm together with an OE-6630 silicon resin (trade name, Dow Corning Corporation, US) and then cured to manufacture a white light emitting module.
- Substantially the same backlight unit as Embodiment 1 was prepared as the backlight unit according to Embodiment 2, except that the white light emitting module was used as the light source.
- a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE (corporate name, Germany) was mixed at about 0.7 wt % with urethane acrylate at 100 wt % purchased from BASF SE, and a coat thereof was applied and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 ⁇ m to form a light diffusion layer having an average thickness of about 50 ⁇ m and a shape as shown in FIG. 4 c on the surface thereof, thereby preparing a diffusion sheet.
- a transparent base substrate trade name: XU42, Toray Industries, Inc., Japan
- a second coating composition including a green nanocomposite described in Embodiment 1 was applied as a coating and cured on the other surface opposite to the one surface of the PET film on which the light collection pattern was formed to form an optical layer having an average thickness of about 5 ⁇ m and a shape as shown in FIG. 4 d on a surface thereof, thereby preparing a first light collection sheet according to Embodiment 3.
- a first coating composition including a red nanocomposite described in Embodiment 1 was applied as a coating and cured on the other surface opposite to the one surface of the PET film on which the light collection pattern was formed to form an optical layer having an average thickness of about 5 ⁇ m and a shape as shown in FIG. 4 d on a surface thereof, thereby preparing a second light collection sheet according to Embodiment 3.
- Embodiment 4 Substantially the same backlight unit as that of Embodiment 3 was prepared as a backlight unit according to Embodiment 4 of the present invention, except that the white light emitting module described Embodiment 2 was used as the light source.
- the diffusion sheet of Embodiment 3 and the first light collection sheet and the second light collection sheet of Embodiment 1 were prepared.
- the second coating composition including the green nanocomposite described in Embodiment 1 was applied as a coating and cured on the one surface of the light guide plate of Embodiment 1 to form the first optical layer having a thickness of about 5 ⁇ m.
- the first coating composition including the red nanocomposite described in Embodiment 1 was applied as a coating and cured on the first optical layer to form the second optical layer having a thickness of about 5 ⁇ m. Accordingly, a light guide plate according to Embodiment 5 of the present invention including the base substrate, and the first and second optical layers was manufactured.
- Embodiment 5 The same backlight unit as that of Embodiment 5 was prepared as a backlight unit of Embodiment 6 of the present invention, except that the white light emitting module was used as the light source.
- Substantially the same backlight unit as that of Embodiment 1 was prepared as a backlight unit according to Comparative example 1, except that the white light emitting module described in Embodiment 2 was used as the light source and the diffusion sheet included in the backlight unit according to Embodiment 3 was used.
- Substantially the same backlight unit as that of Embodiment 1 was prepared as a backlight unit according to Comparative example 2, except that, in the diffusion sheet, a red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was used instead of the red nanocomposite, and a green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was used instead of the green nanocomposite.
- a red nano light-emitting body trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea
- a green nano light-emitting body trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea
- Substantially the same backlight unit as that of Embodiment 3 was prepared as a backlight unit according to Comparative example 4, except that the green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was used in the first light collection sheet instead of the green nanocomposite, and the red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was used in the second light collection sheet instead of the red nanocomposite.
- the green nano light-emitting body trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea
- the red nano light-emitting body trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea
- Substantially the same backlight unit as that of Embodiment 5 was prepared as a backlight unit according to Comparative example 6, except that, in the light guide plate, the red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was used instead of the red nanocomposite and the green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was used instead of the green nanocomposite.
- the red nano light-emitting body trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea
- the green nano light-emitting body trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea
- a color gamut, brightness and color coordinates (red, green, and blue) were measured with respect to the display devices 1 to 6 and the comparative devices 1 to 7 using SR-3AR (trade name, TOPCON Corporation, Japan) serving as a spectroradiometer.
- the red, green and blue color coordinates were obtained by causing the iPhone 4 display panels to display red, green and blue and then recording color coordinates represented by the spectroradiometer. The result is shown in the following Table 2.
- a chromatic ratio is a percentage of an area of a triangle formed by connecting RGB color coordinates of the display devices and comparative devices with respect to a chromatic range with respect to a National Television Systems Committee (NTSC) chromatic range (hereinafter referred to as an NTSC chromatic range).
- NTSC National Television Systems Committee
- FIG. 10 is an image for describing a color gamut of a display device including a backlight unit according to Comparative example 1
- FIGS. 11A to 11F are images for describing color gamuts of display devices including backlight units according to Embodiments 1 to 6.
- the color gamut of the comparative device 1 including the backlight unit according to Comparative example 1 is about 51.3% of the NTSC chromatic range, whereas the color gamuts of the display devices 1 to 6 are about 73.9% to about 89.2% of the NTSC chromatic range, and thus the display devices 1 to 6 have remarkably larger color gamuts than the comparative device 1 .
- the display devices 1 to 6 have the brightness substantially equal to or higher than the brightness of the comparative device 1 even when the nanocomposites having the structure in which the nano light-emitting body is coated with the wax particles are distributed.
- the coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 ⁇ m to manufacture a flat sheet 1 including an optical layer having a thickness of about 50 ⁇ m.
- a transparent base substrate trade name: XU42, Toray Industries, Inc., Japan
- the temperature of the mixture was increased to about 150° C. to dissolve the wax-based compound and manufacture the wax solution.
- a solution in which about 20 mg of CdSe-based red quantum dots (trade name: Nanodot-HE-606, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was mixed with the wax solution, the solution was cooled to room temperature to manufacture a cooled solution in which about 10 mg of particles was distributed in 1 ml of toluene.
- a wax (trade name: Licowax PED 136 wax, Clariant Gmbh, Switzerland), which is an oxidized high density polyethylene wax (oxidized HDPE wax), having an acid value of about 50 mg KOH/g was used.
- TEOS tetraethoxysilane
- the nanocomposite solution was centrifugally separated at about 5,000 rpm for about 30 minutes using a high speed centrifugal separator to separate the nanocomposite, the solution was cleaned using ethanol and distilled water, the ethanol and the distilled water were removed using the evaporator to manufacture the nanocomposite in a powder phase, and then the solution was distributed in the toluene again to manufacture a distributed solution.
- the distributed solution was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE, and then the toluene was removed to manufacture a coating composition.
- the photoinitiator was mixed at about 0.8 wt % with respect to 100 wt % of urethane acrylate.
- the coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 ⁇ m to manufacture a flat sheet 2 including an optical layer having a thickness of about 50 ⁇ m.
- a transparent base substrate trade name: XU42, Toray Industries, Inc., Japan
- the coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material having a thickness of about 38 ⁇ m to manufacture a comparative sheet 1 including an optical layer having a thickness of about 50 ⁇ m.
- a transparent base substrate trade name: XU42, Toray Industries, Inc., Japan
- the flat sheets 1 and 2 and the comparative sheet 1 which were manufactured as described above, were measured using an absolute quantum efficiency measurement device (trade name: C9920-02, HAMAMATSU Photonics K. K., Japan).
- an absolute quantum efficiency measurement device (trade name: C9920-02, HAMAMATSU Photonics K. K., Japan).
- UV light having a central wavelength of 365 nm was radiated at a radiation intensity of about 1.4 mW/cm 2 for 480 hours, i.e., under severe conditions of about 2,419.2 J/cm 2 , and then second quantum efficiency (QYT2, unit: %) was measured.
- a difference between the first quantum efficiency and the second quantum efficiency was calculated to estimate ultraviolet light stability of the red nanocomposite of the flat sheets 1 and 2 and the red nano light-emitting body of the comparative sheet 1 .
- the light stability estimation result and the heat/moisture stability estimation result are represented in the following Table 3.
- quantum efficiency of the red nanocomposite included in the flat sheet 1 and the red nanocomposite included in the flat sheet 2 is better than quantum efficiency of that included in the comparative sheet 1 . That is, it will be appreciated that the quantum efficiency of the nanocomposites included in the flat sheets 1 and 2 is maintained at about 75% or more even when the same nano light-emitting body as that included in the comparative sheet 1 is used in order to manufacture the flat sheets 1 and 2 and the nanocomposites.
- the red nano light-emitting body is damaged during a process of manufacturing the comparative sheet 1 , for example, a step of mixing the red nano light-emitting body with urethane acrylate or a step of curing the urethane acrylate.
- the nanocomposite having a structure in which the nano light-emitting body is coated with the wax particles is very stable with respect to light, heat and moisture, and the nanocomposite is not easily damaged due to light, heat or moisture even when the nanocomposite is mixed with a sheet-manufacturing composition such as urethane acrylate and cured to manufacture the sheet.
- Substantially the same backlight unit as that of Embodiment 1 was prepared as a backlight unit according to Embodiment 7 of the present invention, except that the light diffusion pattern having the shape shown in FIG. 4 c was formed on the surface of the optical layer of the diffusion sheet.
- initial brightness and initial color coordinates were measured using SR-3AR (trade name, TOPCON Corporation, Japan) serving as a spectroradiometer.
- the backlight units according to Embodiment 7 and Comparative example 8 were selected one by one and the diffusion sheets were separated from the backlight units, and then ultraviolet (UV) light having a central wavelength of 365 nm was radiated to the diffusion sheet at a radiation intensity of about 1.4 mW/cm2 for 480 hours, i.e., under severe conditions of about 2,419.2 J/cm 2 .
- UV light ultraviolet
- the diffusion sheet irradiated with the ultraviolet light was assembled with the blue light emitting module, the light guide plate, and the first and second light collection sheets, final brightness and final color coordinates thereof were measured.
- Table 4 The results are represented in Table 4.
- the diffusion sheets were separated from the other backlight units according to Embodiment 7 and Comparative example 8, the diffusion sheets were left in the thermo-hygrostat under the severe conditions of a temperature of 85° C. and a relative humidity 85% for 480 hours.
- the diffusion sheets left in the high temperature/high humidity conditions were assembled to the blue light emitting module, the light guide plate, and the first and second light collection sheets again, and then final brightness and final color coordinates thereof were measured. The results are represented in Table 5.
- the initial/final brightness and the initial/final color coordinates are average values of the values measured at nine points of the display section on which the light guide plate, the diffusion sheet, and the first and second light collection sheets were deposited, except for a portion of the backlight unit at which the light source was disposed.
- the 9 points are designated as shown in FIG. 12 .
- a light source is designated by LS
- a display section on which a light guide plate, a diffusion sheet, and first and second light collection sheets are deposited is designated by DS
- points 1, 2 and 3 in the display section DS adjacent to the light source LS are a light entering section
- points 7, 8 and 9 opposite to the light entering section are a light-facing section.
- each of the points 1, 2 and 3 is spaced a/6 from a first edge of the display section DS adjacent to the light entering section, and each of the points 7, 8 and 9 is spaced a/6 from a second edge of the display section DS corresponding to the light-facing section.
- each of the points 1, 4 and 7 is spaced b/6 from a third edge that connects the first and second edges, and each of the points 3, 6 and 9 is spaced b/6 from a fourth edge facing the third edge.
- the points 1, 2 and 3 are spaced a/3 from the points 4, 5 and 6, respectively, and the points 4, 5 and 6 are spaced a/3 from the points 7, 8 and 9, respectively.
- the points 1, 4 and 7 are spaced b/3 from the points 2, 5 and 8, respectively, and the points 2, 5 and 8 are spaced b/3 from the points 3, 6 and 9, respectively.
- the initial brightness of the backlight unit according to Embodiment 7 of the present invention was about 6,207 cd/m 2 , which is about 1.77 times the initial brightness of the backlight unit according to Comparative example 8 of about 3,502 cd/m 2 .
- the final brightness measured after the ultraviolet light in the severe conditions was applied to the backlight unit according to Embodiment 7 of the present invention was reduced in comparison with the initial brightness by about 150 cd/m 2
- the final brightness of the backlight unit according to Comparative example 8 was reduced by about 1,617 cd/m 2 , which is substantially half of the initial brightness.
- a difference ( ⁇ x) of an x coordinate was about 0.001 and a difference ( ⁇ y) of a y coordinate was about 0.002
- a difference ( ⁇ x) between the initial color coordinates and the final color coordinates of the backlight unit according to Comparative example 8 was 0.023 and a difference ( ⁇ y) of a y coordinate was about 0.035.
- the final brightness measured after severe high temperature and high humidity conditions were applied to the backlight unit according to Embodiment 8 of the present invention was reduced in comparison with the initial brightness by about 182 cd/m2, whereas the final brightness of the backlight unit according to Comparative example 8 was reduced by about 1,959 cd/m2, which is substantially half of the initial brightness.
- a difference ( ⁇ x) of the x coordinate was about 0.005 and a difference ( ⁇ y) of the y coordinate was about 0.006, whereas a difference ( ⁇ x) between the initial color coordinates and the final color coordinates of the backlight unit according to Comparative example 8 is 0.035 and a difference ( ⁇ y) of the y coordinate is about 0.044.
- the nanocomposite is not easily damaged during a process of manufacturing the diffusion sheet, and stability with respect to heat, moisture and light is better than that of the nano light-emitting body even in the diffusion sheet.
- a benzotriazol-based ultraviolet light absorbent (trade name: Tinuvin-329, BASF SE, Germany) at 0.5 wt % and a hindered amine-based photostablizer (trade name: Tinuvin-770, BASF SE, Germany) at 0.5 wt % were mixed with a methylmethacrylate polymer at 100 wt %, a pellet type resin was manufactured using an extruder (an inner diameter: 27 mm, L/D: 40, Leistritz. Co.), and the resin was extruded using a sheet extruder to manufacture an optical plate having a thickness of about 0.4 mm. A coating composition including a blue nanocomposite was coated on one surface of the optical plate to form an optical layer having a thickness of about 5 ⁇ m to manufacture a light guide plate.
- the coating composition was cooled to room temperature after the wax solution was mixed with a solution in which about 20 mg of a blue nano light-emitting body (trade name; Nanodot-HE-480, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene, and was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE.
- the photoinitiator was mixed at about 0.8 wt % with the urethane acrylate at 100 wt %.
- the solution was manufactured by removing the toluene using an evaporator.
- a catalyst (tetra-n-butylphosphoniumbromide) purchased from Nippon Industries Co. Ltd. (corporate name, Japan) was mixed at 0.07 wt % with bis(2,3-epithiopropyl)sulfide at 100 wt % and agitated at room temperature to manufacture a uniformized solution.
- the uniformized solution was agitated, defoamed, and then filtered through a polytetrafluoroethylene membrane (PTFE membrane) having a thickness of about 0.5 ⁇ m to manufacture a base material.
- PTFE membrane polytetrafluoroethylene membrane
- a second light collection sheet was manufactured through substantially the same process as the method of manufacturing the first light collection sheet.
- the optical layer of the light guide plate was disposed at a light exiting surface of light provided from the light source.
- wax (trade name: Licowax PED 136 wax, Clariant Gmbh, Switzerland) 20 mg, which is oxidized high density polyethylene wax (oxidized HDPE wax) serving as a wax-based compound, having an acid value of about 30 mg KOH/g was mixed with 1 ml of toluene, the solution was increased to a temperature of about 150° C. to dissolve the wax-based compound and manufacture a wax solution.
- a solution in which about 20 mg of a CdSe-based blue nano light-emitting body (trade name: Nanodot-HE-480, QD solution Co.
- the coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 ⁇ m to form a light diffusion layer having a shape as shown in FIG. 4 c on a surface thereof.
- An average thickness of the light diffusion layer was about 50 ⁇ m.
- a catalyst (tetra-n-butylphosphoniumbromide) purchased from Nippon Industries Co. Ltd. (corporate name, Japan) was mixed at 0.07 wt % with bis(2,3-epithiopropyl)sulfide at 100 wt % and agitated at room temperature to manufacture a uniformized solution.
- the uniformized solution was agitated, defoamed, and filtered through a polytetrafluoroethylene membrane (PTFE membrane) having a thickness of about 0.5 ⁇ m to manufacture a base material, and the base material was applied on a PET film having a thickness of about 75 ⁇ m and then pressed by a forming roll to manufacture a light collection pattern having a height of about 25 ⁇ m on the PET film, thereby manufacturing a first light collection sheet.
- PTFE membrane polytetrafluoroethylene membrane
- a coating composition including the blue nanocomposite, the polyurethane acrylate and the photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) described in Embodiment 9 was applied as a coating and cured on an opposite surface of the PET film on which the light collection pattern was formed, and an optical layer having a shape as shown in FIG. 4 d and an average thickness of about 5 ⁇ m was formed on the surface thereof to manufacture a second light collection sheet.
- ⁇ x represents a difference between a maximum value and a minimum value of x coordinates of the points 1 to 9
- ⁇ y represents a difference between a maximum value and a minimum value of y coordinates of the points 1 to 9.
- the light entering section adjacent to the light source i.e., the color coordinates of the points 1 to 3
- the color coordinates of the points 1 to 3 had substantially the same numerical values as the color coordinates of the points 7 to 9. That is, it will be appreciated that, in the backlight units according to Embodiments 7 to 9 of the present invention, there is almost no difference in color coordinates between the light entering section and the light-facing section.
- the values of the backlight units according to Embodiments 7 to 9 are remarkably smaller than the value in Comparative example 1. That is, in the backlight unit according to Comparative example 1, the light-facing section appears yellower to the observer than the light entering section due to a difference in color coordinates between the light entering section and the light-facing section. However, it will be appreciated that the difference in color coordinates of the points 1 to 9 is remarkably reduced by the optical sheet including the blue nanocomposite like the backlight units according to Embodiments 7 to 9. Accordingly, as the blue nanocomposite is applied to at least one of the diffusion sheet, the light guide plate and the light collection sheet, the color coordinates of the backlight unit can be uniformly adjusted as a whole.
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Abstract
Disclosed is a nanocomposite. The nanocomposite includes a wax particle, at least one nano light-emitting body positioned inside the wax particle, and a silicon oxide protective layer for coating the nano light-emitting body. The nanocomposite can improve light stability and heat/moisture stability of the nano light-emitting body.
Description
- This application claims priority to Korean Patent Application No. 10-2012-0126925 filed on Nov. 9, 2012 and Korean Patent Application No. 10-2013-0032896 filed on Mar. 27, 2013, and all the benefits accruing therefrom under 35 U.S.C. §119, the contents of which are incorporated by reference in their entirety.
- 1. Field of the Invention
- The present invention relates to a nanocomposite, and an optical member and a backlight unit having the optical member.
- 2. Discussion of Related Art
- A nano light-emitting body including a quantum dot or the like is a material having a crystalline structure with a size of several to tens nanometers, and is constituted by hundreds to thousands atoms. Since a band gap increases as sizes of the nano light-emitting bodies are reduced even when the nano light-emitting bodies are formed of the same material, emission properties become different according to the sizes of the nano light-emitting bodies. In addition, the emission properties become different according to the used material even when the nano light-emitting bodies have the same size. The nano light-emitting bodies are variously used in various kinds of light emitting devices and electronic devices by adjusting such properties thereof.
- However, since nano light-emitting bodies are very sensitive to ultraviolet light, heat, moisture, and so on, a lifespan of an electronic device may be reduced when the nano light-emitting bodies are applied to electronic devices or the like. In order to solve these problems, while methods of forming protective layers on upper and lower surfaces of a thin film including the nano light-emitting bodies to protect the nano light-emitting bodies in the thin film from ultraviolet light, heat, moisture, and so on have been proposed, it is difficult to completely prevent intrusion of the moisture into the thin film.
- Meanwhile, a display device uses a white light source configured to emit white light in general. As the white light passes through a color filter, a user who observes the display device can see a color image. The white light source includes a blue light emitting diode (LED) chip configured to emit blue light, and a photoconversion substance configured to allow the light source to finally emit white light using the blue light. An yttrium aluminum garnet (YAG) phosphor is mainly used as the photoconversion substance. However, since the YAG phosphor has a wide emission spectrum throughout a red light wavelength band and a green light wavelength band, it is difficult to increase color purity of the color represented as the light generated by the white light source using the phosphor passes through the color filter, and color reproducibility of the display device may be decreased.
- In order to improve the color reproducibility of the display device, in recent times, a variety of research on application of nano light-emitting bodies having an emission spectrum with a narrow full width at half maximum (FWHM) and high power density to display devices is being conducted.
- In consideration of these problems, the present invention is directed to providing a nanocomposite capable of improving stability of a nano light-emitting body with respect to ultraviolet light, heat, moisture, and so on.
- The present invention is also directed to providing an optical member, a diffusion sheet and a light collection sheet to which the nanocomposites are applied.
- The present invention is also directed to providing a backlight unit to which at least one of the optical member, the diffusion sheet and the light collection sheet is applied.
- A nanocomposite according to an embodiment of the present invention includes a wax particle, at least one nano light-emitting body and an inner protective layer. The nano light-emitting body is disposed in the wax particle. The inner protective layer coats the nano light-emitting body and is formed of silicon oxide.
- In the embodiment, the inner protective layer may coat one nano light-emitting body. Unlike this, the inner protective layer may coat two or more nano light-emitting bodies.
- In the embodiment, the nanocomposite may further include an outer protective layer. The outer protective layer may coat a surface of the wax particle and may be formed of silicon oxide. Here, the nanocomposite may include a wax layer formed on a surface of the outer protective layer and formed of a wax-based compound.
- A nanocomposite according to another embodiment of the present invention includes a wax particle, at least one nano light-emitting body and an outer protective layer. The nanocomposite is disposed in the wax particle. The outer protective layer coats a surface of the wax particle and is formed of silicon oxide.
- In the embodiment, the nanocomposite may include a wax layer formed on a surface of the outer protective layer and including a wax-based compound.
- An optical member according to an embodiment of the present invention includes a base substrate, and a first optical layer disposed on one surface of the base substrate and in which at least one nanocomposite is distributed. The first nanocomposite includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- In the embodiment, the optical member may further include a light diffusion layer formed on the first optical layer. Here, a light diffusion pattern may be formed on a surface of the light diffusion layer.
- In the embodiment, the optical member may further include a second optical layer disposed on the other surface of the base substrate opposite to the one surface and in which at least one second nanocomposite is distributed. Here, the second nanocomposite may include a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle. Here, the optical member may further include a light diffusion layer formed on the second optical layer, and a light diffusion pattern may be formed on a surface of the light diffusion layer.
- In the embodiment, the optical member may further include a third optical layer disposed on the first optical layer and in which at least one third nanocomposite is distributed. Here, the third nanocomposite may include a third wax particle, and at least one third nano light-emitting body disposed in the third wax particle.
- In the embodiment, at least one of the first to third nanocomposites may further include an inner protective layer or an outer protective layer formed of silicon oxide. The inner protective layer may coat a surface of any one of the first to third nano light-emitting bodies, and the outer protective layer may coat a surface of any one of the first to third wax particles. When any one of the first to third nanocomposites includes the outer protective layer, the wax layer formed of the wax-based compound may coat a surface of the outer protective layer.
- In the embodiment, at least one of the first to third optical layers may include an optical pattern formed on a surface thereof.
- A diffusion sheet according to another embodiment of the present invention includes a base substrate, and a first optical layer disposed on one surface of the base substrate, in which at least one nanocomposite is disposed, and having a light diffusion pattern formed on a surface thereof. The first nanocomposite includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- In the embodiment, the diffusion sheet may further include a second optical layer disposed on the other surface opposite to the one surface and including at least one second nanocomposite. The second nanocomposite may include a second wax particle, and at least one nano light-emitting body disposed in the second wax particle. Here, a light diffusion pattern may be formed on a surface of the second optical layer.
- In the embodiment, the diffusion sheet may further include an intermediate layer disposed between the base substrate and the second optical layer or between the base substrate and the first optical layer. Here, the intermediate layer may include at least one third nanocomposite, and the third nanocomposite may include a third wax particle, and at least one nano light-emitting body disposed in the third wax particle.
- In the embodiment, the diffusion sheet may further include a second optical layer disposed on the other surface of the base substrate opposite to the one surface and having a light collection pattern formed on a surface thereof.
- A diffusion sheet according to another embodiment of the present invention includes a base substrate, a light diffusion layer formed on one surface of the base substrate, and a first optical layer formed on the other surface of the base substrate opposite to the one surface and including at least one first nanocomposite. The first nanocomposite includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle.
- In the embodiment, the diffusion sheet may further include a second optical layer disposed on the first optical layer and including at least one second nanocomposite. Here, the second nanocomposite may include a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle.
- In the embodiment, the diffusion sheet may further include a light diffusion layer formed on the first optical layer.
- A light collection sheet according to an embodiment of the present invention includes a base substrate, and a light collection pattern including a nanocomposite disposed on the base substrate and having at least one nano light-emitting body disposed in the wax particle.
- A light collection sheet according to another embodiment of the present invention includes a base substrate, a light collection pattern disposed on one surface of the base substrate, and an optical layer disposed on the other surface of the base substrate opposite to the one surface and including a nanocomposite. Here, the nanocomposite includes a wax particle, and at least one nano light-emitting body disposed in the wax particle.
- In the embodiment, a light diffusion pattern may be formed on a surface of the optical layer.
- A backlight unit according to an embodiment of the present invention includes a light source, a diffusion sheet and a light collection sheet, and at least one of the diffusion sheet and the light collection sheet includes a wax particle, and one or more nanocomposites including at least one nano light-emitting body disposed in the wax particle.
- In the embodiment, the light source may include a blue light emitting module.
- In the nanocomposite according to the present invention, since the nano light-emitting body is protected by a wax-based compound or silicon oxide, light stability and moisture/heat stability of the nano light-emitting body can be remarkably improved.
- In addition, according to the optical member and the backlight unit of the present invention, the color gamut of the display device can be increased using the nanocomposite, and color purity and color reproducibility of the color displayed on the display device can also be improved.
- The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which:
-
FIGS. 1A to 1C are views for describing a nanocomposite according to an embodiment of the present invention; -
FIG. 2 is a view for describing a nano light-emitting body shown inFIGS. 1A to 1C ; -
FIGS. 3A to 3C are views for describing a nanocomposite according to another embodiment of the present invention; -
FIGS. 4A and 4B are views for describing an optical member according to the embodiment of the present invention; -
FIGS. 4C to 4G are views for describing various types of optical patterns; -
FIGS. 5A to 5I are views for describing embodiments of a diffusion sheet according to the present invention; -
FIGS. 6A to 6D are views for describing embodiments of a light collection sheet according to the present invention; -
FIGS. 7A to 7C are views for describing embodiments of a light guide plate according to the present invention; -
FIGS. 8 and 9 are views for describing a backlight unit according to an embodiment of the present invention; -
FIG. 10 is an image for describing a color gamut of a display device including a backlight unit according to Comparative example 1; -
FIGS. 11A to 11F are images for describing color gamuts of display devices including backlight units according toembodiments 1 to 6; and -
FIG. 12 is a view for describing 9 points of a color coordinates uniformity estimation test. - Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be variously modified and may have various shapes, and specific embodiments will be shown in the drawings and described below in detail. However, the present invention is not limited to the specific disclosures but all changes, equivalents and substitutions will be understood to fall within the spirit and the technical scope of the present invention. In the accompanying drawings, dimensions of structures are exaggerated or deemphasized for the purpose of clarity of the present invention.
- While terms such as first, second, or the like, may be used to describe various components, the components are not limited by the terms. The terms are used only to distinguish one component from another component. For example, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component without departing from the spirit of the present invention.
- The terms used in the application are not intended to limit the present invention but are merely used to describe specific embodiments. A singular form may include a plural referent unless the context specifically indicates otherwise. In the application, when an element is referred to as “comprising,” “including” or “having” something, it does not preclude other features, steps, operations, components, parts and/or combinations, but may further include other features, steps, operations, components, parts and/or combinations unless the context clearly indicates otherwise.
- Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. Although preferred methods, techniques, devices, and materials are described, any methods, techniques, devices, or materials similar or equivalent to those described herein may be used in the practice or testing of the present invention. Structures described herein are to be understood also to refer to functional equivalents of such structures.
- In the present invention, a wax-based compound is an organic compound that is in a solid state at room temperature and has a melting point higher than room temperature, and a wax particle is a regular or irregular particle configured by recrystallizing the wax-based compound and physically forming a monolithic body. Here, room temperature is a temperature within a range of about 15° C. to about 25° C. In addition, in the present invention, emission is a phenomenon in which electrons in the material are transitioned from a ground state to an excited state by an external stimulus, and then the electrons in the excited state are dropped to the stable ground state to emit light corresponding to a difference in energy between the ground state and the excited state.
- In addition, in the present invention, a blue nanocomposite is a nanocomposite in which the nano light-emitting body is formed of only a blue nano light-emitting body. In addition, a green nanocomposite is a nanocomposite in which the nano light-emitting body is formed of only a green nano light-emitting body, and a red nanocomposite is a nanocomposite in which the nano light-emitting body is formed of only a red nano light-emitting body.
- In addition, in the present invention, a multi-color nanocomposite is a nanocomposite in which the nano light-emitting body is formed of at least two kinds of nano light-emitting bodies selected from the blue, green and red nano light-emitting bodies.
- The blue nano light-emitting body is generally a nano light-emitting body having an emission peak in a blue wavelength band of about 430 nm to about 470 nm, and the green nano light-emitting body is generally a nano light-emitting body having an emission peak in a green wavelength band of about 520 nm to about 560 nm, and the red nano light-emitting body is generally a nano light-emitting body having an emission peak in a red wavelength band of about 600 nm to about 660 nm.
-
FIGS. 1A to 1C are views for describing a nanocomposite according to an embodiment of the present invention, andFIG. 2 is a view for describing a nano light-emitting body shown inFIGS. 1A to 1C . - Referring to
FIGS. 1A and 2 , a nanocomposite 100 a according to the embodiment of the present invention includes awax particle 110, and at least one nano light-emittingbody 120 disposed in thewax particle 110. - The
wax particle 110 is formed of a wax-based compound. Thewax particle 110 may encapsulate the nano light-emittingbody 120 to prevent damage to the nano light-emittingbody 120 due to moisture, heat, light, and so on, caused by an external environment. In addition, as the nano light-emittingbody 120 is disposed in thewax particle 110, thewax particle 110 may stably distribute the nano light-emittingbody 120 in a resin to form a base substrate or an optical coating layer of the optical member. - In the present invention, encapsulation means that the nano light-emitting
body 120 is disposed in thewax particle 110 and the nano light-emittingbody 120 is surrounded by thewax particle 110. Here, Van der Waals force may be applied between the nano light-emittingbody 120 and thewax particle 110. - A polymer, copolymer or oligomer typed synthetic wax may be used as the wax-based compound that constitutes the
wax particle 110. For example, a polyethylene-based wax, a polypropylene-based wax or an amide-based wax may be used as the wax-based compound. - As an embodiment, when the wax-based compound is the polyethylene-based wax or the polypropylene-based wax, the wax-based compound may include at least one of monomers represented by the following
chemical formula 1 tochemical formula 7. - In the
chemical formulae 1 to 7, R1, R3, R5 and R7 may independently be a single bond or an alkylene group (*—(CH2)x-*, x is an integer of 1 to 10) with 1 to 10 carbon atoms, R2, R4, R6 and R8 may independently be hydrogen or an alkyl group with 1 to 10 carbon atoms, and Ra, Rb, Rc, Rd, Re, Rf and Rg may independently be hydrogen or an alkyl group with 1 to 3 carbon atoms. - In a specific example, when R2 of the
chemical formula 1 is hydrogen, the monomer of thechemical formula 1 may include a carboxy group, and unlike this, when R2 of thechemical formula 1 is an alkyl group having 1 to 10 carbon atoms, the monomer of thechemical formula 1 may include an ester group. In addition, when R4 of thechemical formula 2 is hydrogen, the monomer of thechemical formula 2 may include an aldehyde group, and unlike this, when R4 of thechemical formula 2 is an alkyl group having 1 to 10 carbon atoms, the monomer of thechemical formula 2 may include a ketone group. In addition, when R6 of thechemical formula 3 is hydrogen, the monomer of thechemical formula 3 may include a hydroxy group, and unlike this, when R6 of thechemical formula 3 is an alkyl group having 1 to 10 carbon atoms, the monomer of thechemical formula 3 may include an ether group. - When all of Ra, Rb, Rc, Rd, Re, Rf and Rg of the
chemical formula 1 to 7 are hydrogen, the wax-based compound may be a polyethylene-based wax. For example, the polyethylene-based wax may be a polyethylene wax (a PE wax) including only a monomer of thechemical formula 7 in which Rg is hydrogen. Unlike this, the polyethylene-based wax may be the polyethylene wax further including at least one of oxygen-containing monomers of thechemical formula 1 to 6 in which Ra, Rb, Rc, Rd, Re and Rf are hydrogen, besides the monomer of thechemical formula 7 in which Rg is hydrogen. For example, the polyethylene-based wax further including the at least one of the oxygen-containing monomers may include an oxidized polyethylene wax (an oxidized PE wax) which is an oxide of the polyethylene, an ethylene-acrylic acid copolymer, an ethylene-vinyl acetate copolymer, an ethylene-maleic anhydride copolymer, and so on. - In addition, when Ra, Rb, Rc, Rd, Re, Rf and Rg of the
chemical formula 1 to 7 are independently a methyl group having 1 carbon atom, the wax-based compound may be the polypropylene-based wax. For example, the polypropylene-based wax may be a polypropylene wax (a PP wax) including only a monomer of thechemical formula 7 in which Rg is a methyl group. Unlike this, the polypropylene-based wax may be a polypropylene wax further including at least one of oxygen-containing monomers of thechemical formulae 1 to 6 in which Ra, Rb, Rc, Rd, Re and Rf are hydrogen, besides the monomer of thechemical formula 7 in which Rg is a methyl group. For example, the polypropylene-based wax further including the at least one of the oxygen-containing monomers may include a propylene-maleic anhydride copolymer or the like. - In another embodiment, when the wax-based compound is an amide-based wax, the wax-based compound may be a polymer, copolymer or oligomer in which a main chain includes an amide bond (—CONH—). The amide-based wax may include a monomer having 1 to 10 carbon atoms. The amide-based wax may further include at least one of oxygen-containing monomers represented by the
chemical formulae 1 to 6, besides the monomer having 1 to 10 carbon atoms. - When the wax-based compound includes the at least one of the oxygen-containing monomer of the
chemical formulae 1 to 6, thewax particle 110 may more stably encapsulate the nano light-emittingbody 120 than when only the monomer of thechemical formula 7 is included. This is because, when the wax-based compound includes the oxygen-containing monomer, interaction between metals of the nano light-emittingbody 120 and thewax particle 110 is strengthened by polarity of oxygen contained in the oxygen-containing monomer. - When the wax-based compound includes a monomer having a carboxy group represented by the
chemical formula 1 among the oxygen-containing monomers, thewax particle 110 is more advantageous for encapsulation of the nano light-emittingbody 120, because the interaction between thewax particle 110 and the nano light-emittingbody 120 is further strengthened. Accordingly, in the embodiment of the present invention, thewax particle 110 may be formed of the wax-based compound including at least the carboxy group serving as a substituent. - The wax-based compound that constitutes the
wax particle 110 may have an acid value of about 1 mg KOH/g to about 200 mg KOH/g. In the embodiment, the acid value of the wax-based compound is the number of mg of potassium hydroxide (KOH) required for neutralization of the wax-based compound 1g. An amount of the carboxy group contained in the wax-based compound may increase as the acid value of the wax-based compound increases. When the acid value of the wax-based compound is less than about 1 mg KOH/g, the nano light-emittingbody 120 may not be stably encapsulated because the amount of the carboxy group that interacts with the nano light-emittingbody 120 is very slight. In addition, when the acid value of the wax-based compound is more than about 200 mg KOH/g, a surface of the nano light-emittingbody 120 may be oxidized by the carboxy group. As a specific example, in order to stably encapsulate the nano light-emittingbody 120, the wax-based compound that constitutes thewax particle 110 can have the acid value of about 5 mg KOH/g to about 50 mg KOH/g. - The
wax particle 110 may be formed of a wax-based compound having a high density of about 0.95 g/cm3 or more. Since the high density wax-based compound having a high density of about 0.95 g/cm3 has a melting point relatively higher than a low density wax-based compound having a low density of less than about 0.95 g/cm3, a heat resistance of the nanocomposite 100 a including thewax particle 110 formed of the high density wax-based compound can be improved. In addition, since the high density wax-based compound has better crystallizability upon recrystallization than the low density wax-based compound, thewax particle 110 formed of the high density wax-based compound can more stably encapsulate the nano light-emittingbody 120. - As a specific example, the polyethylene (PE) wax may be classified as a high density PE wax (an HDPE wax) having a density of about 0.95 g/cm3 or more and a low density PE wax (an LDPE wax) having a density of less than about 0.95 g/cm3, and the
wax particle 110 may be formed of the HDPE wax. The density of the HDPE wax may be about 1.20 g/cm3 or less, and in this case, a melting point of the HDPE wax may be about 120° C. to about 200° C. On the other hand, a melting point of the LDPE wax may be about 80° C. to about 110° C. Accordingly, thewax particle 110 formed of the HDPE wax can improve the heat resistance of the nanocomposite 100 a according to the present invention more than that formed of the LDPE wax. - The
wax particle 110 may be formed of a wax-based compound having a weight-average molecular weight of about 1,000 to 20,000. In the present invention, the weight-average molecular weight is an average molecular weight obtained by averaging molecular weights of component molecular species of a polymer compound having a molecular weight distribution with a weight fraction. When the weight-average molecular weight of the wax-based compound is less than about 1,000, since the wax-based compound cannot easily stay in a solid state at room temperature, it may be difficult to encapsulate the nano light-emittingbody 120 at room temperature. In addition, when the weight-average molecular weight of the wax-based compound exceeds about 20,000, since a recrystallization size (an average diameter) of the wax-based compound is several hundreds of μm or more, even if the composite is manufactured using the wax-based compound, the wax-based compound cannot be easily distributed in a solvent or a resin. Further, when the molecular weight of the wax-based compound exceeds about 20,000, since the wax-based compound has a melting point of about 200° C. or more, the nano light-emittingbody 120 may be damaged during a process of encapsulating the nano light-emittingbody 120 with the wax-based compound. - A known nano light-emitting body may be used as the nano light-emitting
body 120 with no limitation. For example, as shown inFIG. 2 , the nano light-emittingbody 120 may include acenter particle 121, and aligand 123 coupled to a surface of thecenter particle 121. - The
center particle 121 may be formed of group II-VI compounds, group II-V compounds, group III-V compounds, group III-IV compounds, group III-VI compounds, group IV-VI compounds, or a mixture thereof. The mixture includes cases in which a dopant is doped in a ternary system compound, a tetrad system compound, or a mixture thereof, in addition to a simply mixed mixture. - Examples of the group II-VI compounds may include magnesium sulfate (MgS), magnesium selenide (MgSe), magnesium telluride (MgTe), calcium sulfate (CaS), calcium selenide (CaSe), calcium telluride (CaTe), strontium sulfate (SrS), strontium selenide (SrSe), strontium telluride (SrTe), cadmium sulfate (CdS), cadmium selenide (CdSe), cadmium telluride (CdTe), zinc sulfate (ZnS), zinc selenide (ZnSe), zinc telluride (ZnTe), mercury sulfate (HgS), mercury selenide (HgSe), mercury telluride (HgTe), or the like.
- Examples of the group II-V compounds may include zinc phosphide (Zn3P2), zinc arsenide (Zn3As2), cadmium phosphide (Cd3P2), cadmium arsenide (Cd3As2), cadmium nitride (Cd3N2), zinc nitride (Zn3N2), or the like.
- Examples of the group III-V compounds may include boron phosphide (BP), aluminum phosphide (AlP), aluminum arsenide (AlAs), aluminum antimonide (AlSb), gallium nitride (GaN), gallium phosphide (GaP), gallium arsenide (GaAs), gallium antimonide (GaSb), indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), indium antimonide (InSb), aluminum nitride (AlN), boron nitride (BN), or the like.
- Examples of the group III-IV compounds may include boron carbide (B4C), aluminum carbine (Al4C3), gallium carbide (Ga4C), or the like.
- Examples of the group III-VI compounds may include aluminum sulfate (Al2S3), aluminum selenide (Al2Se3), aluminum telluride (Al2Te3), gallium sulfate (Ga2S3), gallium selenide (Ga2Se3), indium sulfate (In2S3), indium selenide (In2Se3), gallium telluride (Ga2Te3), indium telluride (In2Te3), or the like.
- Examples of the group IV-VI compounds may include lead sulfate (PbS), lead selenide (PbSe), lead telluride (PbTe), tin sulfate (SnS), tin selenide (SnSe), tin telluride (SnTe), or the like.
- For example, the
center particle 121 may have a core/shell structure. Both a core and a shell of thecenter particle 121 may be formed of the exemplified compounds above. The exemplified compounds may be used alone or in combinations of two or more to form the core or the shell. While a band gap of the compound that forms the core may be smaller than a band gap of the compound that forms the shell, it is not limited thereto. However, when thecenter particle 121 has a core/shell structure, the compound that forms the shell is different from the compound that forms the core. For example, thecenter particle 121 may have a CdSe/ZnS (core/shell) structure having a core including CdSe and a shell including ZnS, or an InP/ZnS (core/shell) structure having a core including InP and a shell including ZnS. - As another example, the
center particle 121 may have a core/multi-shell structure provided with a shell having at least two layers or more. For example, thecenter particle 121 may have a CdSe/ZnSe/ZnS (core/first shell/second shell) structure having a core including CdSe, a first shell surrounding a surface of the core and including ZnSe, and a second shell surrounding a surface of the first shell and including ZnS. In addition, thecenter particle 121 may have an InP/ZnSe/ZnS (core/first shell/second shell) structure having a core including InP, a first shell including ZnSe, and a second shell including ZnS. - As further another example, the
center particle 121 is a single structure, which may be formed of the group II-VI compounds only or the group III-V compounds only, instead of the core/shell structure. - While not shown, the
center particle 121 may further include a cluster molecule serving as a seed. The cluster molecule is a compound serving as a seed in a process of manufacturing thecenter particle 121, and thecenter particle 121 can be formed by growing thecenter particle 121 on the cluster molecule, using a precursor of the compound constituting thecenter particle 121. Here, various compounds disclosed in Korean Patent Laid-open Publication No. 2007-0064554 may be used as the cluster molecule, but the cluster molecule is not limited thereto. - The
ligand 123 can prevent theneighboring center particles 121 from being agglomerated and quenched. Theligand 123 may be bonded to thecenter particle 121 and may have hydrophobicity. - As an example of the
ligand 123, the amine-based compound, the carboxy group acid compound, or the like, having the alkyl group with 6 to 30 carbon atoms may be used. Examples of the amine-based compound having the alkyl group may include hexadecylamine, octylamine, or the like. As another example of theligand 123, the amine-based compound, the carboxy group acid compound, or the like, having the alkenyl group having 6 to 30 carbon atoms may be used. On the other hand, as an example of theligand 123, a phosphine compound such as trioctylphosphine, triphenolphosphine, t-butylphosphine, or the like; a phosphine oxide such as trioctylphosphine oxide or the like; pyridine or thiophene, and so on, may be used. The kind of theligand 123 is not limited thereto, and if necessary, the nano light-emittingbody 120 may be formed of only thecenter particle 121 without theligand 123. The nanocomposite 100 a according to the embodiment of the present invention may have various shapes, and the onenanocomposite 100 a may have the at least one nano light-emittingbody 120. For example, the one nano light-emittingbody 120 may be disposed in the onewax particle 110, or unlike this, two to tens of millions of nano light-emittingbodies 120 may be disposed in the onewax particle 110. - For example, the plurality of nano light-emitting
bodies 120 disposed in the onewax particle 110 may have the emission peak in the same wavelength band. That is, the nano light-emittingbodies 120 may include any one selected from a first color nano light-emitting body having an emission peak in a first wavelength band, a second color nano light-emitting body having an emission peak in a second wavelength band, and a third color nano light-emitting body having an emission peak in a third wavelength band. - The first color nano light-emitting body may be a blue nano light-emitting body having an emission peak in a wavelength band of about 430 nm to about 470 nm, the second color nano light-emitting body may be a green nano light-emitting body having an emission peak in a wavelength band of about 520 nm to about 560 nm, and the third color nano light-emitting body may be a red nano light-emitting body having an emission peak in a wavelength band of about 600 nm to about 660 nm. In this case, the nanocomposite 100 a may be referred to as any one of the blue nanocomposite, the green nanocomposite and the red nanocomposite.
- As another specific example, at least two of the plurality of nano light-emitting
bodies 120 disposed in the onewax particle 110 may have emission peaks in different wavelength bands. That is, the plurality of nano light-emittingbodies 120 disposed in the onewax particle 110 may include two selected from the blue nano light-emitting body, the green nano light-emitting body and the red nano light-emitting body. For example, the green nano light-emitting body and the red nano light-emitting body may be disposed in thewax particle 110. In this case, the nanocomposite 100 a may be referred to as a multi-color nanocomposite. - Meanwhile, a diameter of the nanocomposite 100 a may be about 50 nm to about 30 μm. The diameter may be defined as a value (a hydrodynamic diameter) measured by a dynamic light scattering (DLS) method of calculating the diameter using a Stokes-Einstein equation related to a diffusion coefficient.
- Referring to
FIG. 1B , ananocomposite 100 b according to an embodiment of the present invention may include thewax particle 110, the at least one nano light-emittingbody 120, and an outerprotective layer 130. Since thenanocomposite 100 b is similar to the nanocomposite 100 a shown inFIG. 1A except that the outerprotective layer 130 is further included, detailed overlapping description thereof will be omitted. A diameter of thenanocomposite 100 b may be about 50 nm to about 30 μm. - The outer
protective layer 130 is formed on a surface of thewax particle 110 to coat thewax particle 110. The outerprotective layer 130 is formed of silicon oxide (SiOx, 1≦x≦2). The outerprotective layer 130 can prevent the nano light-emittingbody 120 from being damaged due to moisture, heat, light, or the like, together with thewax particle 110. - The outer
protective layer 130 may be formed through hydrolysis and a condensation reaction of a silicon oxide precursor material. For example, the outerprotective layer 130 may be formed by mixing thewax particle 110 in which the nano light-emittingbodies 120 are disposed, the silicon oxide precursor material, a catalyst material and water in an organic solvent and growing silicon oxide on the surface of thewax particle 110. In this case, the outerprotective layer 130 may include silica (SiO2). - Example of the silicon oxide precursor material may include triethoxysilane (HTEOS), tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS), dimethyldiethoxysilane, tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMOS), trimethoxysilane, dimethyldimethoxysilane, phenyltriethoxysilane (PTEOS), phenyltrimethoxysilane (PTMOS), diphenyldiethoxysilane, diphenyldimethoxysilane, or the like. In addition, the silicon oxide precursor material may be synthesized using a halosilane, in particular, a chlorosilane, for example, trichlorosilane, methyltrichlorosilane, ethyltrichlorosilane, phenyltrichlorosilane, tetrachlorosilane, dichlorosilane, methyldichlorosilane, dimethyldichlorosilane, chlorotriethoxysilane, chlorotrimethoxysilane, chloromethyltriethoxysilane, chloroethyltriethoxysilane, chlorophenyltriethoxysilane, chloromethyltrimethoxysilane, chloroethyltrimethoxysilane, chlorophenyltrimethoxysilane, or the like, or may be synthesized using polysiloxane, polysilazane, or the like.
- Example of the organic solvent may include an alcoholic solvent such as methanol, ethanol, propanol, butanol, pentanol, hexanol, methyl cellosolve, butyl cellosolve, propylene glycol, diethylene glycol, or the like, or toluene. These organic solvents may be used alone or in combinations of two or more.
- An alkali material, for example, ammonia (NH3), may be used as the catalyst material. In this case, as ammonia water (NH4OH) is mixed with the organic solvent, ammonia may be provided as a catalyst material in a process of forming the outer
protective layer 130. - While not shown, the outer
protective layer 130 can coat a plurality ofwax particles 110. For example, the outerprotective layer 130 can coat at least twowax particles 110 adjacent to each other, and the silicon oxide may be filled in a space between thewax particles 110 to form the nanocomposite. When a first wax particle and a second wax particle are coated with the outerprotective layer 130, as the first nano light-emitting body disposed in the first wax particle has an emission peak in the same wavelength band as the second nano light-emitting body disposed in the second wax particle, thenanocomposite 100 b may be any one of the blue nanocomposite, the green nanocomposite and the red nanocomposite. - On the other hand, when the first wax particle and the second wax particle are coated with the outer
protective layer 130, the first nano light-emitting body disposed in the first wax particle may have an emission peak at a different wavelength band from the second nano light-emitting body disposed in the second wax particle. That is, thenanocomposite 100 b may be a multi-color nanocomposite. - According to the above description, as the
nanocomposite 100 b further includes the outerprotective layer 130 in comparison with the nanocomposite 100 a described with reference toFIG. 1A , the nano light-emittingbody 120 can be more stably protected from external moisture, heat, light, or the like. - Referring to
FIG. 1C , ananocomposite 100 c according to the embodiment of the present invention includes thewax particle 110, the at least one nano light-emittingbody 120, the outerprotective layer 130 and awax layer 140. Since thenanocomposite 100 c is substantially the same as thenanocomposite 100 b described with reference toFIG. 1B except that thewax layer 140 is further included, detailed overlapping description thereof will be omitted. A diameter of thenanocomposite 100 c may be about 50 nm to about 30 μm. - The
wax layer 140 coats the outerprotective layer 130. That is, thewax layer 140 surrounds thewax particle 110 coated with the outerprotective layer 130. Thewax layer 140 is formed of a wax-based compound. Since the wax-based compound that forms thewax layer 140 is substantially the same as the wax-based compound that forms thewax particle 110, detailed overlapping description thereof will be omitted. - While
FIG. 1C shows that thewax layer 140 coats the onewax particle 110 of which one surface is coated with the outerprotective layer 130, thewax layer 140 can coat two ormore wax particles 110. For example, whileFIG. 1B describes that the outerprotective layer 130 coats both of the first wax particle in which the first nano light-emitting body is disposed and the second wax particle in which the second nano light-emitting body is disposed, the surface of the outerprotective layer 130 may be coated with thewax layer 140 again. - In addition, the
wax layer 140 can coat at least twonanocomposites 100 b shown inFIG. 1B . As the wax-based compound that forms thewax layer 140 fills a space between the neighboringnanocomposites 100 b, the onewax layer 140 can coat the at least two wax particles coated with the outerprotective layer 130. - The
nanocomposite 100 c may be any one of the blue, green and red nanocomposites according to the kind of the nano light-emittingbodies 120 included therein, or may be the multi-color nanocomposites. - According to the above description, as the
nanocomposite 100 c described with reference toFIG. 1C further includes thewax layer 140 in comparison with thenanocomposite 100 b described with reference toFIG. 1B , the nano light-emittingbody 120 can be more stably protected from external moisture, heat, light, and so on. -
FIGS. 3A to 3C are views for describing a nanocomposite according to another embodiment of the present invention. - Referring to
FIG. 3A , a nanocomposite 200 a according to an embodiment of the present invention includes awax particle 210, at least one nano light-emittingbody 220 disposed in thewax particle 210, and an innerprotective layer 230. - Since the
wax particle 210 is substantially the same as thewax particle 110 described with reference toFIG. 1A and the nano light-emittingbody 220 is substantially the same as the nano light-emittingbody 120 described with reference toFIG. 2 , detailed overlapping description thereof will be omitted. - The inner
protective layer 230 coats the nano light-emittingbody 220. The innerprotective layer 230 may be in direct contact with the surface of the nano light-emittingbody 220 to coat the nano light-emittingbody 220. Here, the nano light-emittingbodies 220 disposed in thewax particle 210 may be coated with the innerprotective layers 230, respectively. - That is, the one nano light-emitting
body 220 may be coated with the one innerprotective layer 230. The innerprotective layer 230 may be formed of silicon oxide. The silicon oxide that forms the innerprotective layer 230 is substantially the same as the silicon oxide that forms the outerprotective layer 130 described with reference toFIG. 1B , detailed overlapping description thereof will be omitted. - The plurality of nano light-emitting
bodies 220 disposed in thewax particle 210 may have an emission peak in the same wavelength band. For example, the nanocomposite 200 a may be any one of the blue, green and red nanocomposites. - On the other hand, at least two of the plurality of nano light-emitting
bodies 220 disposed in thewax particle 210 may have emission peaks in different wavelength bands. That is, the nano light-emittingbodies 220 disposed in thewax particle 210 may include at least two of the blue nano light-emitting body, the green nano light-emitting body and the red nano light-emitting body. For example, the nanocomposite 200 a may be a multi-color nanocomposite. - While not shown, the inner
protective layer 230 may coat two or more nano light-emittingbodies 220. When the two or more nano light-emittingbodies 220 are coated with the innerprotective layer 230, a space between the neighboring nano light-emittingbodies 220 may be filled with the silicon oxide that forms the innerprotective layer 230. Here, the nano light-emittingbodies 220 coated with the one innerprotective layer 230 may have one emission peak in the same wavelength band. On the other hand, at least two of the nano light-emittingbodies 220 coated with the one innerprotective layer 230 may have emission peaks in different wavelength bands. - Meanwhile, when the two or more nano light-emitting
bodies 220 coated with the one innerprotective layer 230 are referred to as an emission group, at least two emission groups may be disposed in the onewax particle 210. Here, one emission group may include first nano light-emitting bodies, and the other emission group may include second nano light-emitting bodies having an emission peak in a different wavelength band from the first nano light-emitting bodies. On the other hand, each of the emission groups may include at least two nano light-emitting bodies having emission peaks in different wavelength bands. - A diameter of the nanocomposite 200 a may be about 50 nm to about 30 μm.
- According to the above description, since the nanocomposite 200 a has a structure secondarily encapsulated by the wax-based compound in a state in which at least one nano light-emitting
body 220 is primarily encapsulated by the innerprotective layer 230, the nano light-emittingbody 220 can be prevented from being damaged due to external heat, light, moisture, or the like. - Referring to
FIG. 3B , ananocomposite 200 b according to the embodiment of the present invention may include thewax particle 210, the at least one nano light-emittingbody 220, the innerprotective layer 230, and an outerprotective layer 240. Since thenanocomposite 200 b is similar to the nanocomposite 200 a described with reference toFIG. 3A except that the outerprotective layer 240 is further included, detailed overlapping description thereof will be omitted. A diameter of thenanocomposite 200 b may be about 50 nm to about 30 μm. - The outer
protective layer 240, which may be formed of silicon oxide, coats thewax particle 210. Since the outerprotective layer 240 is substantially the same as the outerprotective layer 130 described with reference toFIG. 1B , detailed overlapping description thereof will be omitted. The outerprotective layer 240 can prevent the nano light-emittingbody 220 from being damaged due to moisture, heat, light, or the like, together with thewax particle 210 and the innerprotective layer 230. - While
FIG. 3B shows that the outerprotective layer 240 coats the onewax particle 210, the outerprotective layer 240 can coat the plurality ofwax particles 210. For example, the outerprotective layer 240 can coat the two neighboringwax particles 210, and the silicon oxide may be filled in the space between thewax particles 210 to form the nanocomposite. - Referring to
FIG. 3C , ananocomposite 200 c according to an embodiment of the present invention may include awax particle 210, at least one nano light-emittingbody 220, an innerprotective layer 230, an outerprotective layer 240 and awax layer 250. Since thenanocomposite 200 c is similar to thenanocomposite 200 b described with reference toFIG. 3B except that thewax layer 250 is further included, detailed overlapping description thereof will be omitted. A diameter of thenanocomposite 200 c may be about 50 nm to about 30 μm. - The
wax layer 250 can coat the outerprotective layer 240. Thewax layer 250 is formed of a wax-based compound. Since the wax-based compound that forms thewax layer 250 is similar to the wax-based compound described with reference toFIG. 1A , detailed overlapping description thereof will be omitted. - The
wax layer 250 may coat the onewax particle 210 having the surface coated with the outerprotective layer 240 as shown inFIG. 3C , or may coat the plurality ofwax particles 210 having the surfaces coated with the outerprotective layer 240, although this is not shown. - According to the above description, as the
nanocomposite 200 c encapsulates thewax particle 210 with the outerprotective layer 240 and thewax layer 250, the nano light-emittingbody 220 can be prevented from being damaged due to external heat, light, moisture, or the like. If necessary, a silicon oxide layer and a wax layer may be additionally and repeatedly deposited on thenanocomposite 200 c shown inFIG. 3C to manufacture the nanocomposite encapsulated with multiple layers. - Hereinafter, methods of manufacturing the nanocomposites according to the present invention as described above and stability estimation thereof will be described in detail.
- After 20 mg of a wax-based compound was mixed with 1 ml of toluene, as a temperature was increased to about 150° C., the wax-based compound was dissolved to manufacture a wax solution. After a solution in which about 20 mg of CdSe-based red quantum dots (trade name: Nanodot-HE-606, QD solution Co. Ltd., Korea) was distributed in the 1 ml of toluene was mixed with the wax solution, the mixed solution was cooled to room temperature to manufacture a cooled solution in which about 10 mg of particles per ml of toluene were distributed. Here, as the wax-based compound, a wax (trade name: Licowax PED 136 wax, Clariant AG, Switzerland) serving as an oxidized high density polyethylene wax (an oxidized HDPE wax) having an acid value of about 50 mg KOH/g was used, and the particles distributed in the cooled solution included wax particles and red quantum dots disposed in the wax particles.
- After the cooled solution was added to the solution in which 10 ml of ethanol and 1 ml of tetraethoxysilane (TEOS, Sigma Aldrich Inc., US) were mixed, 2.5 ml of ammonia water having a concentration of 30% was additionally added to form the silicon oxide on surfaces of the particles, and the nanocomposite solution including the nanocomposite was manufactured.
- The nanocomposite solution was centrifugally separated using a high speed centrifugal separator at about 5,000 rpm for about 30 minutes to separate the nanocomposite and the separated nanocomposite was cleaned using ethanol and distilled water, and the ethanol and the distilled water were removed using an evaporator to manufacture a
nanocomposite 1 in a powder phase. - The nanocomposite solution manufactured through the first and second steps described in ‘Manufacture of the nanocomposite—1’ was added to the wax solution including the wax-based compound. As the solution was cooled to room temperature to remove the toluene using the evaporator, a
nanocomposite 2 in a powder phase having a wax layer formed on a surface of the silicon oxide layer was manufactured. - After the solution in which about 10 mg of CdSe-based red quantum dots (trade name: Nanodot-HE-606, QD solution Co. Ltd., Korea) was distributed in 0.5 ml of toluene was mixed with the solution in which 10 ml of ethanol was mixed with 1 ml of TEOS, 2.5 ml of ammonia water having a concentration of 30% was added to manufacture quantum dots having a surface on which the silicon oxide layer was formed. After the quantum dots were centrifugally separated using the high speed centrifugal separator at about 5,000 rpm for about 30 minutes, the quantum dots were cleaned with ethanol and distilled water.
- Next, after 20 mg of the wax-based compound was mixed with 1 ml of toluene, the toluene solution in which the quantum dots coated with the silicon oxide layers were distributed was mixed with the wax solution manufactured by increasing the temperature to about 150° C. and dissolving the wax-based compound, and then the toluene solution was cooled to room temperature and the toluene was removed to manufacture a
nanocomposite 3 in a powder phase. - The nanocomposite manufactured through ‘Manufacture of nanocomposite—3’ was mixed with the solution in which 10 ml of ethanol and 1 ml of TEOS were mixed, and 2.5 ml of ammonia water having a concentration of 30% was added.
- Then, the solution was centrifugally separated using the high speed centrifugal separator at about 5,000 rpm for about 30 minutes to separate the nanocomposite, and the nanocomposite was cleaned using ethanol and distilled water. The ethanol and the distilled water were removed using the evaporator to manufacture a
nanocomposite 4 in a powder phase. - The
nanocomposites 1 to 4 in the powder phase were prepared through the above-mentioned methods, and first quantum efficiency (QYT1, unit: %) thereof was measured using an absolute quantum efficiency measurement device (trade name: C9920-02, HAMAMATSU Photonics K. K., Japan). Next, after ultraviolet light (UV) having a peak wavelength of 365 nm was radiated at a radiation strength of about 1.4 mW/cm2 for 480 hours, i.e., under severe conditions of about 2,419.2 J/cm2, second quantum efficiency (QYT2, unit: %) was measured. A difference (ΔQY1=QYT1−QYT2, unit: %) between the first quantum efficiency and the second quantum efficiency was calculated to estimate ultraviolet light stability with respect to each of thenanocomposites 1 to 4. The result is shown in Table 1. - In addition, the
nanocomposites 1 to 4 in the powder phase were prepared to measure first quantum efficiency (QYT1, unit: %), and then were left in a thermo-hygrostat under severe conditions of a temperature 85° C. and a relative humidity 85% for 480 hours. Next, third quantum efficiency (QYT3, unit: %) of thenanocomposites 1 to 4 after being left under the severe conditions were measured. A difference (ΔQY2=QYT1−QYT3, unit: %) between the first quantum efficiency and the third quantum efficiency was measured to estimate heat/moisture stability with respect to thenanocomposites 1 to 4. The result is shown Table 1. -
TABLE 1 Ultraviolet light stability Heat/moisture stability Classification (ΔQY1, %) (ΔQY2, %) Nanocomposite 15.5 7.3 Nanocomposite 26.7 5.8 Nanocomposite 32.8 5.9 Nanocomposite 43.3 4.2 - Referring to Table 1, it will be appreciated that the ultraviolet light stability with respect to the
nanocomposites 1 to 4 is 6.7% or less, and the heat/moisture stability is 7.3% or less. A small value in the variation (ΔQY1) of the quantum efficiency due to the ultraviolet light radiation under severe conditions (a radiation amount of about 2,419.2 J/cm2) indicates improved stability with respect to the ultraviolet light. A small value in the variation (ΔQY2) of the quantum efficiency due to severe conditions of a high temperature and a high humidity (a temperature 85° C. and a relative humidity 85%) indicates improved stability with respect to the heat and moisture. - In consideration that the ultraviolet light stability with respect to the nanocomposite (see
FIG. 1A ) having the nano light-emitting body coated with the wax particles only is about 15% and the heat/moisture stability is about 16%, it will be appreciated that the nanocomposites including both of the wax particle and the silicon oxide like thenanocomposites 1 to 4 have improved ultraviolet light stability and heat/moisture stability. -
FIGS. 4A and 4B are views for describing an optical member according to the embodiment of the present invention. - Referring to
FIG. 4A , anoptical member 501 according to the embodiment of the present invention includes abase substrate 510, and a firstoptical layer 520 in which at least one first nanocomposite CX1 is distributed. - The
base substrate 510 may include a light incidence surface through which light enters, and a light emission surface opposite to the light incidence surface through which the light that has entered is emitted. Thebase substrate 510 is formed of a transparent material through which light passes. Examples of the transparent material may include a polymethylmethacrylate (PMMA) resin, a polycarbonate (PC) resin, a polyimide (PI) resin, a polyethylene (PE) resin, a polypropylene (PP) resin, a methacrylic resin, a polyurethane resin, a polyethylene terephthalate (PET) resin, or the like. - The first
optical layer 520 may be formed on one surface of thebase substrate 510, i.e., the light incidence surface or the light emission surface. The firstoptical layer 520 is formed of a polymer resin and the first nanocomposite CX1. The polymer resin is a matrix material of the firstoptical layer 520, and the first nanocomposite CX1 is distributed in the polymer resin. - The first nanocomposite CX1 includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle. For example, the first nanocomposite CX1 may have substantially the same structure as the nanocomposite 100 a described with reference to
FIG. 1A . - In addition, as described with reference to
FIGS. 1B , 1C, 3A, 3B and 3C, the first nanocomposite CX1 may further include an outer protective layer that coats a surface of the first wax particle, or an inner protective layer that coats the first nano light-emitting body. When the first nanocomposite CX1 further includes the outer protective layer, the first nanocomposite CX1 may further include a wax layer that coats the outer protective layer. That is, the first nanocomposite CX1 distributed in the firstoptical layer 520 may have any one structure of the structures of the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C. Accordingly, detailed description of the nanocomposite CX1 will be omitted. - For example, the first nanocomposite CX1 distributed in the first
optical layer 520 may include one kind selected from the blue, green and red nanocomposites. Here, the light passing through the firstoptical layer 520 may have an emission spectrum in only one wavelength band among the blue, green and red wavelength bands. - As another example, the first nanocomposite CX1 distributed in the first
optical layer 520 may include at least two kinds among the blue, green and red nanocomposites. For example, the first nanocomposite CX1 distributed in the firstoptical layer 520 may be constituted by a plurality of green nanocomposites and a plurality of red nanocomposites. - As another example, the first nanocomposite CX1 distributed in the first
optical layer 520 may include a multi-color nanocomposite. The multi-color nanocomposite, which is the first nano light-emitting bodies disposed in the first wax particle, may include at least two kinds selected from the blue, green and red nano light-emitting bodies. For example, the multi-color nanocomposite may include the green nano light-emitting body and the red nano light-emitting body. - The first
optical layer 520 may include an optical pattern formed on a surface thereof. A shape of the optical pattern may be variously adjusted according to a function of theoptical member 501. The optical pattern may include a light diffusion pattern, a light collection pattern, a light emitting pattern, or the like. The shape of the optical pattern will be described with reference toFIGS. 4C to 4G . - While not shown, the first
optical layer 520 may further include diffusion beads that diffuse light. The kind of the diffusion beads is not particularly limited, and any diffusion beads that are conventionally used in the art may be used with no limitation. - On the other hand, an optical layer including the diffusion beads may be formed on the
base substrate 510 as a separate layer from the firstoptical layer 520. The optical layer including the diffusion beads may be formed on one surface of thebase substrate 510 on which the firstoptical layer 520 is formed, or the other surface opposite to the one surface. - Referring to
FIG. 4B , anoptical member 502 according to another embodiment of the present invention includes abase substrate 510, a firstoptical layer 520 and a secondoptical layer 530. The firstoptical layer 520 includes a first nanocomposite CX1, and the secondoptical layer 530 includes a second nanocomposite CX2. The first nanocomposite CX1 includes a first wax particle and at least one first nano light-emitting body, and the second nanocomposite CX2 includes a second wax particle and at least one second nano light-emitting body. - Since the
optical member 502 described with reference toFIG. 4B is similar to theoptical member 501 described with reference toFIG. 4A except that the secondoptical layer 530 is further included, detailed overlapping description thereof will be omitted. - The second
optical layer 530 is formed on the other surface opposite to the one surface of thebase substrate 510 on which the firstoptical layer 520 is formed. The secondoptical layer 530 includes a polymer resin, and the second nanocomposite CX2 distributed in the polymer resin. - In the second nanocomposite CX2, the second wax particle is formed of a wax-based compound. The at least one second nano light-emitting body is disposed in the second wax particle. Since the second nanocomposite CX2 is substantially the same as the first nanocomposite CX1 described with reference to
FIG. 4A , detailed overlapping description will be omitted. - For example, when all of the first nanocomposites CX1 have an emission peak in the same wavelength band and all of the second nanocomposites CX2 have an emission peak in the same wavelength band, the first nanocomposites CX1 and the second second nanocomposites CX2 may have emission peaks in different wavelength bands.
- When a wavelength of the light generated from the first nanocomposite CX1 is shorter than a wavelength of the light generated from the second nanocomposite CX2, since a part of the light generated from the first nanocomposite CX1 excites the second nano light-emitting bodies included in the second nanocomposite CX2, the second nanocomposite CX2 may be excited by the part of the light generated from the first nanocomposite CX1 as well as the light provided by the light source. That is, the second nanocomposite CX2 may receive sufficient light from the first nanocomposite CX1 and the light source to be excited. Further, as the light generated from the light source primarily arrives at the first
optical layer 520, the first nanocomposite CX1 can receive higher energy from the light source than the secondoptical layer 530, and thus power density of the light generated from the first nanocomposite CX1 can be maximized. - For example, when a path of the light is in a direction from the first
optical layer 520 toward the secondoptical layer 530, the first nanocomposite CX1 may be a green nanocomposite, and the second nanocomposite CX2 may be a red nanocomposite. - As another example, the first nanocomposite CX1 may include at least two kinds of nanocomposites, and the second nanocomposite CX2 may include one kind of nanocomposite. For example, the first nanocomposite CX1 may include a green nanocomposite and a red nanocomposite, and the second nanocomposite CX2 may include a green nanocomposite.
- As another example, the first nanocomposite CX1 and/or the second nanocomposite CX2 may include a multi-color nanocomposite. For example, the multi-color nanocomposite may include a green nano light-emitting body and a red nano light-emitting body.
- While the first
optical layer 520 and the secondoptical layer 530 are shown inFIGS. 4A and 4B to have flat surfaces, at least one of the first and secondoptical layers optical members - While not shown, the
optical member 502 may further include a third optical layer including a third nanocomposite. - The third optical layer may be formed on the first
optical layer 520. When the third optical layer is formed on the firstoptical layer 520, an optical pattern may be formed on the third optical layer. - The third nanocomposite includes a third wax particle, and at least one third nano light-emitting body disposed in the third wax particle. The third nanocomposite may include any one structure of the structures described with reference to
FIGS. 1A to 1C and 3A to 3C. That is, the third nanocomposite may include an inner protective layer and/or an outer protective layer. When the third nanocomposite includes the outer protective layer, the third nanocomposite may further include a wax layer that coats the outer protective layer. - Meanwhile, when the
optical member 502 further includes the third optical layer, the secondoptical layer 530 may be omitted. -
FIGS. 4C to 4G are views for describing various shapes of the optical pattern. - Referring to
FIG. 4A together withFIG. 4B , the optical pattern formed on the surface of the firstoptical layer 520 may be acontinuous pattern 520 a. Thecontinuous pattern 520 a may have a shape in which a plurality of convex sections are continuously connected. Each of the convex sections protrudes in a direction from thebase substrate 510 toward the outside of theoptical member 502. Heights or widths of the convex sections may be different from each other and may have irregular values. In another embodiment, while not shown, the optical pattern formed on the surface of the firstoptical layer 520 may have a shape in which a plurality of concave sections are continuously connected. Each of the concave sections is recessed in a direction from the surface of theoptical member 502 toward the inside of theoptical member 502. Depths or widths of the concave sections may be appropriately adjusted according to necessity, and depths or widths of the concave sections may have irregular values. In another embodiment, thecontinuous pattern 520 a may have a shape in which the concave sections and the convex sections are combined, or may be an embossing pattern. Thecontinuous pattern 520 a may function as a light diffusion pattern. - On the other hand, the
continuous pattern 520 a may include a plurality of segments as shown inFIG. 4D .FIG. 4D is a plan view for describing the segments. Referring toFIG. 4D , thecontinuous pattern 520 a may include convex sections formed to correspond to the plurality of segments having irregular planar shapes, which are irregularly arranged. Heights, planar shapes and surface areas of the convex sections are not particularly limited, and the heights or surface areas of the convex sections may have irregular values. While not shown, thecontinuous pattern 520 a may include concave sections formed to correspond to the plurality of segments having irregular planar shapes, which are irregularly arranged. - Referring to
FIG. 4E , the optical pattern formed on the surface of the firstoptical layer 520 may be a discontinuousconvex pattern 520 b. In the discontinuousconvex pattern 520 b, the convex sections may be disposed apart from each other. The convex sections that constitute the discontinuousconvex pattern 520 b may have dot shapes when seen in a plan view. Heights or widths of the convex sections may be different from each other, and may have irregular values. - Referring to
FIG. 4F , the optical pattern formed on the surface of the firstoptical layer 520 may be a discontinuousconcave pattern 520 c. In the discontinuousconcave pattern 520 c, the concave sections may be disposed apart from each other. Here, the discontinuousconcave pattern 520 c may have dot shapes when seen in a plan view. Depths or widths of the concave sections may be different from each other, and depths or widths of the concave sections may have irregular values. - Referring to
FIG. 4G , the optical pattern formed on the surface of the firstoptical layer 520 may be alight collection pattern 520 d. Thelight collection pattern 520 d includes a plurality of protrusions, and a cross-section of each of the protrusions may have a triangular shape. The protrusions may be continuously arranged in a first direction substantially parallel to a cut surface that defines a cross-section of the triangular shape. For example, each of the protrusions may extend in a second direction perpendicular to the cross-section to have a predetermined height. That is, each of the protrusions may have a triangular column shape having the predetermined height. Unlike this, a height of each of the protrusions may vary in the second direction. In this case, the height of each of the protrusions may vary linearly or non-linearly in the second direction. Further, the height of each of the protrusions may vary in a predetermined period, or may vary irregularly. The heights of the protrusions may vary independently. A vertex angle of each of the protrusions that constitutes the light collection pattern may be about 90°, but may be appropriately adjusted according to necessity. When the height of each of the protrusions varies in the second direction, the vertex angle of each of the protrusions may vary according to the position thereof. - While various shapes of the optical patterns formed on the first
optical layer 520 have been described inFIGS. 4C to 4F , the shapes may also be applied to the optical pattern formed on the secondoptical layer 530. When the optical patterns are formed at each of the first and secondoptical layers optical layer 520 and the optical pattern formed on the secondoptical layer 530 may be the same as or different from each other. - While not shown, each of the
optical members FIGS. 4A and 4B may further include a light diffusion layer, on which the optical pattern described with reference toFIGS. 4C to 4G is formed, formed on the firstoptical layer 520. - Unlike this, in the
optical member 501 described inFIG. 4A , the light diffusion layer on which the optical pattern described with reference toFIGS. 4C to 4G is formed may be formed on the other surface of thebase substrate 510. - As described above, the nanocomposite including the nano light-emitting body coated with the wax particles may be applied to the at least one optical layer of the
optical members optical members optical members - The
optical members optical members - Hereinafter, the diffusion sheet, the light collection sheet and the light guide plate to which the nanocomposites are applied will be described in detail with reference to the accompanying drawings.
-
FIGS. 5A to 5I are views for describing embodiments of the diffusion sheet according to the present invention. - Referring to
FIG. 5A , adiffusion sheet 1001 according to the embodiment of the present invention includes abase substrate 1100, and a firstoptical layer 1200 including a first nanocomposite CX1. - The
base substrate 1100 is formed of a transparent material. Since the transparent material is substantially the same as described with reference toFIG. 4A , detailed overlapping description will be omitted. - The first
optical layer 1200 is formed on one surface of thebase substrate 1100. The surface on which the firstoptical layer 1200 is formed may be the plane of light emission or may be the plane of light incidence. - The first nanocomposite CX1 distributed in the first
optical layer 1200 includes a first wax particle and at least one first nano light-emitting body. The first nano light-emitting body is disposed in the first wax particle and coated with the first wax particle. The first nanocomposite CX1 may have any one of structures of the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C. - The first nanocomposite CX1 may include at least one kind among the blue nanocomposite, the green nanocomposite and the red nanocomposite. For example, the first nanocomposite CX1 may include a green nanocomposite or a red nanocomposite. Alternatively, the first nanocomposite CX1 may include a plurality of green nanocomposites and a plurality of red nanocomposites. Unlike this, the first nanocomposite CX1 may include a multi-color nanocomposite. For example, the multi-color nanocomposite may include both a red nano light-emitting body and a green nano light-emitting body.
- The first
optical layer 1200 includes alight diffusion pattern 1210 formed on a surface thereof. Since thelight diffusion pattern 1210 is substantially the same as thecontinuous pattern 520 a described with reference toFIG. 4C , detailed overlapping description will be omitted. Unlike this, thelight diffusion pattern 1210 may be the discontinuousconvex pattern 520 b described with reference toFIG. 4E or the discontinuousconcave pattern 520 c described with reference toFIG. 4F . - Referring to
FIG. 5B , adiffusion sheet 1002 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1200 and a secondoptical layer 1300. - The first
optical layer 1200 is formed on one surface of thebase substrate 1100, and includes a first nanocomposite CX1. The first nanocomposite CX1 includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle. Since the firstoptical layer 1200 is substantially the same as described with reference toFIG. 5A , detailed overlapping description thereof will be omitted. - The second
optical layer 1300 is formed on the other surface opposite to the one surface on which the firstoptical layer 1200 is formed, and includes a second nanocomposite CX2. The second nanocomposite CX2 includes a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle. The second nanocomposite CX2 may have any one of structures of the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C. - The second nanocomposite CX2 and the first nanocomposite CX1 may have the same structure or different structures. For example, when the first nanocomposite CX1 has the structure described with reference to
FIG. 1A , the second nanocomposite CX2 may have the structure described with reference toFIG. 3A . Alternatively, the first and second nanocomposites CX1 and CX2 may both have the same structure described with reference toFIG. 1B . - The second nanocomposite CX2 may include at least one kind among the blue nanocomposite, the green nanocomposite and the red nanocomposite. For example, the second nanocomposite CX2 may include a green nanocomposite or a red nanocomposite. Alternatively, the second nanocomposite CX2 may include a plurality of green nanocomposites and a plurality of red nanocomposites. Unlike this, the second nanocomposite CX2 may include a multi-color nanocomposite.
- Meanwhile, the second nanocomposite CX2 may have an emission peak in a different wavelength band from a wavelength band to which the emission peak of the first nanocomposite CX1 belongs. Here, FWHM at the emission peak of the first nanocomposite CX1 may be about 70 nm or less. Preferably, the FWHM may be about 50 nm or less, and more preferably, about 40 nm or less. The FWHM may be similarly applied to the second nanocomposite CX2.
- For example, when the first nanocomposite CX1 includes a green nanocomposite, the second nanocomposite CX2 may include a red nanocomposite. Here, the second nanocomposite CX2 may further include a green nanocomposite.
- As another example, when the first nanocomposite CX1 includes a green nanocomposite, the second nanocomposite CX2 may include a multi-color nanocomposite including a green nano light-emitting body and a red nano light-emitting body.
- The second
optical layer 1300 includes alight diffusion pattern 1310 formed on a surface thereof. Since thelight diffusion pattern 1310 is substantially the same as thecontinuous pattern 520 a described with reference toFIG. 4C , detailed overlapping description thereof will be omitted. Unlike this, thelight diffusion pattern 1310 may be the same as the discontinuousconvex pattern 520 b described with reference toFIG. 4E or discontinuousconcave pattern 520 c described with reference toFIG. 4F . - While
FIG. 5B shows that thelight diffusion pattern 1310 of the secondoptical layer 1300 is a continuous pattern having substantially the same structure as thelight diffusion pattern 1210 of the firstoptical layer 1200, thelight diffusion patterns - Referring to
FIG. 5C , adiffusion sheet 1003 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1200, a secondoptical layer 1302 and anintermediate layer 1400. - The first
optical layer 1200 is formed on one surface of thebase substrate 1100, and includes a first nanocomposite CX1. Since the firstoptical layer 1200 is substantially the same as described with reference toFIG. 5A , detailed overlapping description thereof will be omitted. - The second
optical layer 1302 is formed on the other surface opposite to the one surface of thebase substrate 1100 on which the firstoptical layer 1200 is formed, and includes a second nanocomposite CX2. Since the secondoptical layer 1302 is substantially the same as described with reference toFIG. 5B except that the surface of the secondoptical layer 1302 is a flat surface, detailed overlapping description thereof will be omitted. While the secondoptical layer 1302 is shown to have the flat surface, the second optical layer 1301 may further include thelight diffusion pattern 1310, which is substantially the same as described with reference toFIG. 5B . - The
intermediate layer 1400 is disposed between the first and secondoptical layers intermediate layer 1400 may be disposed between thebase substrate 1100 and the secondoptical layer 1302. - The third nanocomposite CX3 includes a third wax particle, and at least one nano light-emitting body disposed in the third wax particle. The third nanocomposite CX3 may have any one of the structures of the nanocomposites described with reference to
FIGS. 1A to 1C and 3A to 3C. Simultaneously, the third nanocomposite CX3 may include at least one kind among the blue nanocomposite, the green nanocomposite and the red nanocomposite. Unlike this, the third nanocomposite CX3 may include a multi-color nanocomposite. - Meanwhile, the third nanocomposite CX3 may have an emission peak in a wavelength band different from the emission peaks of the first and second nanocomposites CX1 and CX2. For example, the first nanocomposite CX1 may include a blue nanocomposite, the second nanocomposite CX2 may include a red nanocomposite, and the third nanocomposite CX3 may include a green nanocomposite. Here, third nanocomposite CX3 may further include a red nanocomposite in addition to the green nanocomposite.
- Referring to
FIG. 5D , adiffusion sheet 1004 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1200, a secondoptical layer 1302 and anintermediate layer 1402. - The first
optical layer 1200 is formed on one surface of thebase substrate 1100, and includes a first nanocomposite CX1. Since thebase substrate 1100 and the firstoptical layer 1200 are substantially the same as described with reference toFIG. 5A , detailed overlapping description thereof will be omitted. - The second
optical layer 1302 is formed on the other surface opposite to the one surface of thebase substrate 1100, and includes a second nanocomposite CX2. Since the secondoptical layer 1302 is substantially the same as described with reference toFIG. 5C except that the secondoptical layer 1302 is directly formed on thebase substrate 1100, detailed overlapping description thereof will be omitted. - The
intermediate layer 1402 is formed between thebase substrate 1100 and the firstoptical layer 1200. Theintermediate layer 1402 includes a third nanocomposite CX3. Since theintermediate layer 1402 is substantially the same as theintermediate layer 1400 described with reference toFIG. 5C except for a disposition position, detailed overlapping description thereof will be omitted. - In embodiments of the present invention, the first nanocomposite CX1 may include a blue nanocomposite, the second nanocomposite CX2 may include a red nanocomposite, and the third nanocomposite CX3 may include a green nanocomposite. Here, each of the first to third nanocomposites CX1, CX2 and CX3 may further include any one of the blue, red and green nanocomposites, in addition to the major nanocomposite that constitutes the nanocomposite.
- While
FIG. 5D shows the case in which a surface of the secondoptical layer 1302 is a flat surface, the secondoptical layer 1302 may further include thelight diffusion pattern 1310 described with reference toFIG. 5B . - Referring to
FIG. 5E , adiffusion sheet 1005 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1202 and alight diffusion layer 1500. - The first
optical layer 1202 is formed on one surface of thebase substrate 1100, and includes a first nanocomposite CX1. Since the firstoptical layer 1202 is substantially the same as the firstoptical layer 1200 described with reference toFIG. 5A except that a surface of the firstoptical layer 1202 is a flat surface, detailed overlapping description thereof will be omitted. - The
light diffusion layer 1500 is formed on the other surface opposite to the one surface of thebase substrate 1100 on which the firstoptical layer 1202 is formed. Thelight diffusion layer 1500 includes alight diffusion pattern 1510 formed on a surface thereof. Thelight diffusion pattern 1510 may be a pattern that is substantially the same as thecontinuous pattern 520 a described with reference toFIG. 4C . Unlike this, thelight diffusion pattern 1510 may be any one of the discontinuousconvex pattern 520 b described with reference toFIG. 4E and the discontinuousconcave pattern 520 c described with reference toFIG. 4F . Thelight diffusion layer 1500 may not include a nanocomposite but function simply to diffuse light. - While
FIG. 5E shows that a surface of the firstoptical layer 1202 is a flat surface, the optical pattern described with reference toFIGS. 4C , and 4E to 4G may also be formed on the surface of the firstoptical layer 1202. - Referring to
FIG. 5F , adiffusion sheet 1006 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1204 and alight diffusion layer 1500. - The first
optical layer 1204 is substantially the same as the firstoptical layer 1202 described with reference toFIG. 5E except that the firstoptical layer 1204 is disposed between thebase substrate 1100 and thelight diffusion layer 1500. Accordingly, detailed overlapping description thereof will be omitted. - The
light diffusion layer 1500 is formed on the firstoptical layer 1204. Thelight diffusion layer 1500 is a layer that does not include a nanocomposite but serves simply to diffuse light. Since thelight diffusion layer 1500 is substantially the same as described with reference toFIG. 5E , detailed overlapping description thereof will be omitted. - Referring to
FIG. 5G , adiffusion sheet 1007 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1204, a secondoptical layer 1302 and alight diffusion layer 1500. - The first
optical layer 1204 is disposed on one surface of thebase substrate 1100, and includes a first nanocomposite CX1. Thelight diffusion layer 1500 is formed on the firstoptical layer 1204, and includes thelight diffusion pattern 1510. Thelight diffusion layer 1500 is a layer that does not include a nanocomposite but serves simply to diffuse light. The firstoptical layer 1204 and thelight diffusion layer 1500 are substantially the same as described with reference toFIG. 5F . Accordingly, detailed overlapping description thereof will be omitted. - The second
optical layer 1302 is disposed on the other surface opposite to the one surface of thebase substrate 1100 on which the firstoptical layer 1204 is formed, and includes a second nanocomposite CX2. The secondoptical layer 1302 is substantially the same as described with reference toFIG. 5D . Accordingly, detailed overlapping description thereof will be omitted. - Referring to
FIG. 5H , adiffusion sheet 1008 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1204, a secondoptical layer 1302, a firstlight diffusion layer 1500 and a secondlight diffusion layer 1600. - Since the
diffusion sheet 1008 is substantially the same as thediffusion sheet 1007 described with reference toFIG. 5G except that the secondlight diffusion layer 1600 is further included, detailed overlapping description thereof will be omitted. The firstlight diffusion layer 1500 ofFIG. 5H is the same layer as the light diffusion layer ofFIG. 5G , and serves to diffuse light. - The second
light diffusion layer 1600 is formed on the secondoptical layer 1302 to oppose the firstlight diffusion layer 1500. The secondlight diffusion layer 1600 includes alight diffusion pattern 1610 formed on a surface thereof, and is a layer that does not include a nanocomposite but serves simply to diffuse light. Thelight diffusion pattern 1610 may be any one of the optical patterns described with reference toFIGS. 4C , and 4E to 4G. - Referring to
FIG. 5I , adiffusion sheet 1009 according to another embodiment of the present invention includes abase substrate 1100, a firstoptical layer 1200 and alight collecting layer 1700. - The first
optical layer 1200 is formed on one surface of thebase substrate 1100. Since the firstoptical layer 1200 includes thelight diffusion pattern 1210 formed on the surface thereof and is substantially the same as described with reference toFIG. 5A , detailed overlapping description thereof will be omitted. - The
light collecting layer 1700 is formed on the other surface opposite to the one surface of the firstoptical layer 1200. Thelight collecting layer 1700 includes alight collection pattern 1710 formed on a surface thereof. Since thelight collection pattern 1710 is substantially the same as the optical pattern described with reference toFIG. 4G , detailed overlapping description thereof will be omitted. - As described with reference to
FIGS. 5A to 5I , the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C may be variously applied to the diffusion sheet. Since the diffusion sheet according to the present invention can convert the light provided from the light source to provide the light to a display panel using the nanocomposite, color purity and color reproducibility of the display device can be improved. -
FIGS. 6A to 6D are views for describing embodiments of a light collection sheet according to the present invention. - Referring to
FIG. 6A , alight collection sheet 2001 according to the embodiment of the present invention includes abase substrate 2100, alight collecting layer 2200 and a firstoptical layer 2300. - The
base substrate 2100 is formed of a transparent material. The transparent material is substantially the same as the transparent material that forms thebase substrate 1100 of thediffusion sheet 1001 described with reference toFIG. 5A . Accordingly, detailed overlapping description thereof will be omitted. - The
light collecting layer 2200 is formed on one surface of thebase substrate 2100. Thelight collecting layer 2200 includes alight collection pattern 2210 formed on a surface thereof. Thelight collection pattern 2210 may be substantially the same as the optical pattern described with reference toFIG. 4G . Thelight collection pattern 2210 is formed to have a cross-sectional shape such that the light entering from thebase substrate 2100 is refracted in a vertical direction. Since the cross-sectional shape is the same as the shape described with reference toFIG. 4G , detailed overlapping description thereof will be omitted. - The first
optical layer 2300 is formed on the other surface opposite to the one surface on which thelight collecting layer 2200 is formed. The firstoptical layer 2300 includes a first nanocomposite CX1. The first nanocomposite CX1 includes a first wax particle, and at least one first nano light-emitting body disposed in the first wax particle. The first nanocomposite CX1 may have any one of the structures of the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C. For example, the first nanocomposite CX1 may include at least one kind selected from the blue, green and red nanocomposites. Unlike this, the first nanocomposite CX1 may include a multi-color nanocomposite. - The first
optical layer 2300 may include an optical pattern formed on a surface thereof. The optical pattern may have any one of the structures described with reference toFIGS. 4C to 4F . Accordingly, detailed overlapping description thereof will be omitted. - While not shown, the
light collection sheet 2001 may further include a second optical layer disposed between the firstoptical layer 2300 and thebase substrate 2100, or between thelight collecting layer 2200 and thebase substrate 2100. Here, the second optical layer may include a second nanocomposite including a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle. - Referring to
FIG. 6B , alight collection sheet 2002 according to another embodiment of the present invention includes abase substrate 2100, a firstoptical layer 2300 and alight collecting layer 2200. - The
light collection sheet 2002 is substantially the same as thelight collection sheet 2001 described with reference toFIG. 6A except that the firstoptical layer 2300 is disposed between thebase substrate 2100 and thelight collecting layer 2200. Accordingly, detailed overlapping description thereof will be omitted. - While not shown, the
light collection sheet 2002 may further include a second optical layer disposed between the firstoptical layer 2300 and thebase substrate 2100. Here, the second optical layer may include a second nanocomposite. - Referring to
FIG. 6C , alight collection sheet 2003 according to another embodiment of the present invention includes abase substrate 2100 and alight collecting layer 2202. - The
light collecting layer 2202 is formed on one surface of thebase substrate 2100, and includes a first nanocomposite CX1. Thelight collecting layer 2202 has thelight collection pattern 2210 formed on a surface thereof. Since the first nanocomposite CX1 is substantially the same as described with reference toFIG. 6A , detailed overlapping description thereof will be omitted. - While not shown, the
light collection sheet 2003 may further include an optical layer formed on the other surface opposite to the one surface on which thelight collecting layer 2202 is formed, or formed between thebase substrate 2100 and thelight collecting layer 2202. Here, the optical layer may include a second nanocomposite. - Referring to
FIG. 6D , alight collection sheet 2004 according to another embodiment of the present invention includes abase substrate 2100, alight collecting layer 2202 in which the first nanocomposite CX1 is distributed, and a firstoptical layer 2400. - The
light collection sheet 2004 is substantially the same as thelight collection sheet 2003 described with reference toFIG. 6C except that the firstoptical layer 2400 is further included. Accordingly, detailed overlapping description thereof will be omitted. - The first
optical layer 2400 is formed on the other surface opposite to the one surface of thebase substrate 2100 on which thelight collecting layer 2202 is formed. The firstoptical layer 2400 includes alight diffusion pattern 2410 formed on a surface thereof. Since thelight diffusion pattern 2410 is substantially the same as thecontinuous pattern 520 a described with reference toFIG. 4C , detailed overlapping description thereof will be omitted. Unlike this, thelight diffusion pattern 2410 may be the same pattern as the optical pattern described with reference toFIGS. 4E and 4F . - While not shown, the
light collection sheet 2004 may further include a second optical layer formed between thebase substrate 2100 and the firstoptical layer 2400. The second optical layer may include a second nanocomposite. - As described with reference to
FIGS. 6A to 6D , the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C may be variously applied to the light collection sheet. Since the light collection sheet according to the present invention can convert the light provided from the light source to provide the light to the display panel using the nanocomposite, color purity and color reproducibility of the color displayed on the display device can be improved. -
FIGS. 7A to 7C are views for describing embodiments of a light guide plate according to the present invention. - Referring to
FIG. 7A , alight guide plate 3001 according to the embodiment of the present invention includes abase substrate 3100, alight emitting pattern 3200 and a firstoptical layer 3300. - The
base substrate 3100 is formed of a transparent material. The transparent material may be, for example, a polymethylmethacrylate (PMMA) resin, a polycarbonate (PC) resin, or the like, but it is not limited thereto. - The
light emitting pattern 3200 is formed on one surface of thebase substrate 3100. A surface of thebase substrate 3100 on which thelight emitting pattern 3200 is formed may be a reflective section of thelight guide plate 3001. When a section of thelight guide plate 3001 facing the light source is referred to as a light entering section of thelight guide plate 3001, light emitted from the light source and guided to thebase substrate 3100 through the light entering section may be reflected by the reflective section, and then emitted to the outside through the light exiting section opposite to the reflective section. Thelight emitting pattern 3200 may have various shapes such as a convex pattern, a concave pattern, or the like, or may be a pattern additionally formed on one surface of thebase substrate 3100. Unlike this, thelight emitting pattern 3200 may be a pattern formed by partially patterning the one surface of thebase substrate 3100. - The first
optical layer 3300 is formed on the other surface opposite to the one surface on which thelight emitting pattern 3200 is formed. That is, a section of thebase substrate 3100 on which the firstoptical layer 3300 is formed may be a light exiting section of thelight guide plate 3001. The firstoptical layer 3300 includes a first nanocomposite CX1. The first nanocomposite CX1 may have any one of the structures of the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C. Simultaneously, the first nanocomposite CX1 may include at least one selected from the blue, green and red nanocomposites. Unlike this, the first nanocomposite CX1 may include a multi-color nanocomposite. While not shown, the firstoptical layer 3300 may have substantially the same pattern as thelight emitting pattern 3200. - While
FIG. 7A shows that only the firstoptical layer 3300 is formed on one surface of thebase substrate 3100, a second optical layer including a second nanocomposite may be formed between thebase substrate 3100 and the firstoptical layer 3300. Unlike this, the second optical layer may be formed between the light emittingpattern 3200 and thebase substrate 3100. - Referring to
FIG. 7B , alight guide plate 3002 according to another embodiment of the present invention includes abase substrate 3100, alight emitting pattern 3210, and a firstoptical layer 3300 in which the first nanocomposite CX1 is distributed. - The
light guide plate 3002 is substantially the same as thelight guide plate 3001 described with reference toFIG. 7A except that thelight emitting pattern 3210 includes the second nanocomposite CX2. Accordingly, detailed overlapping description thereof will be omitted. While not shown, the firstoptical layer 3300 may further include substantially the same pattern as the light emitting pattern described with reference toFIG. 7A . - The
light emitting pattern 3210 includes the second nanocomposite CX2. The second nanocomposite CX2 includes a second wax particle, and at least one second nano light-emitting body disposed in the second wax particle. - The second nanocomposite CX2 may have any one of the structures of the nanocomposites described with reference to
FIGS. 1A to 1C and 3A to 3C. Simultaneously, the second nanocomposite CX2 may include at least one kind among the blue, green and red nanocomposites, or may include a multi-color nanocomposite. The second nanocomposite CX2 may have a different emission peak from the emission peak of the first nanocomposite CX1. For example, the second nanocomposite CX2 may include a green nanocomposite, and the first nanocomposite CX1 may include a red nanocomposite. - While not shown, the
light guide plate 3002 may further include a second optical layer disposed between the firstoptical layer 3300 and thebase substrate 3100. Here, the second optical layer may include a third nanocomposite different from the first and second nanocomposites CX1 and CX2. The third nanocomposite includes a third wax particle, and at least one third nano light-emitting body disposed in the third wax particle. - Referring to
FIG. 7C , alight guide plate 3003 according to another embodiment of the present invention includes abase substrate 3100 and alight emitting pattern 3200. - The
light emitting pattern 3200 is substantially the same as described with reference toFIG. 7A , and thebase substrate 3100 includes the first nanocomposite CX1. The first nanocomposite CX1 is substantially the same as described with reference toFIG. 7A . - While not shown, an optical layer including a second nanocomposite may be formed on the other surface opposite to the one surface of the
base substrate 3100 on which thelight emitting pattern 3200 is formed. Unlike this, the optical layer may be formed between thebase substrate 3100 and thelight emitting pattern 3200. - As described with reference to
FIGS. 7A to 7C , the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C may be variously applied to the light guide plate. Since the light guide plate according to the present invention can convert the light provided from the light source to provide the light to the display panel using the nanocomposite, color purity and color reproducibility of the display device can be improved. -
FIGS. 8 and 9 are views for describing a backlight unit according to an embodiment of the present invention. - Referring to
FIG. 8 , abacklight unit 5001 according to the embodiment of the present invention includes alight source 5100, alight guide plate 5200, areflective plate 5300, adiffusion sheet 5400, a firstlight collection sheet 5510 and a secondlight collection sheet 5520. - A white light emitting module or a blue light emitting module may be used as the
light source 5100. - The white light emitting module may include a blue light emitting chip configured to generate blue light, and a photoconversion layer configured to coat the blue light emitting chip. That is, since the photoconversion layer absorbs and/or converts blue light generated from the blue light emitting chip, the white light emitting module can finally generate white light. The photoconversion layer may include a phosphor including yttrium aluminum garnet (YAG) or the like, or a nano light-emitting body including quantum dots or the like. Green quantum dots may be used as the nano light-emitting body. Unlike this, the photoconversion layer may include the nanocomposites described with reference to
FIGS. 1A to 1C and 3A to 3C. - The blue light emitting module includes a blue light emitting chip configured to generate blue light. That is, an observer can see the blue light emitted from the blue light emitting chip of the blue light emitting module as it is.
- The
light guide plate 5200 may be disposed adjacent to thelight source 5100, the light generated from thelight source 5100 may enter thelight guide plate 5200, and the light emitted from thelight guide plate 5200 may enter thediffusion sheet 5400. Thelight guide plate 5200 may include any one of thelight guide plates FIGS. 7A to 7C . - The
reflective plate 5300 is disposed to face a lower section of thelight guide plate 5200, i.e., a reflective section of thelight guide plate 5200, and the light emitted through the reflective section of thelight guide plate 5200 is reflected again toward thelight guide plate 5200 to increase use efficiency of the light. - The
diffusion sheet 5400 is disposed on thelight guide plate 5200, and the light emitted from thelight guide plate 5200 can be diffused. Thediffusion sheet 5400 may include any one ofdiffusion sheets 1001 to 1009 described with reference toFIGS. 5A to 5I . - The first
light collection sheet 5510 is disposed on thediffusion sheet 5400, and a light collection pattern including a plurality of protrusions described with reference toFIG. 4G is formed on an upper surface of the firstlight collection sheet 5510. The secondlight collection sheet 5520 is disposed on the firstlight collection sheet 5510, and a plurality of protrusions having substantially the same shape as the protrusions formed on the firstlight collection sheet 5510 are formed on an upper surface of the secondlight collection sheet 5520. A longitudinal direction of the protrusions formed at the firstlight collection sheet 5510 may cross a longitudinal direction of the protrusions formed on the secondlight collection sheet 5520 at a predetermined angle. In this case, a crossing angle of the longitudinal directions of the protrusions may be about 90°. At least one of the first and secondlight collection sheets light collection sheets 2001 to 2004 described with reference toFIGS. 6A to 6D . - For example, when the white light emitting module is used as the
light source 5100, at least one of thelight guide plate 5200, thediffusion sheet 5400, and the first and secondlight collection sheets light guide plate 5200, thediffusion sheet 5400, and the first and secondlight collection sheets backlight unit 5001. - Meanwhile, even when the white light emitting module configured to provide white light having high color purity is used, a deviation in color coordinates is generated between the light emitted from the light entering section adjacent to the light source and the light emitted from an opposite section of the
light guide plate 5200 opposite to the light entering section while passing through thelight guide plate 5200, thediffusion sheet 5400, the first and secondlight collection sheets light guide plate 5200. The deviation in color coordinates is generated because light of a specific wavelength is relatively largely scattered while the light moves from the light entering section to the opposite section, the observer recognizes the deviation in color coordinates as a yellowish problem in the opposite section. In addition, color purity and color coordinate uniformity of the display device may be decreased due to characteristics of the material that forms thediffusion sheet 5400, and the first and secondlight collection sheets light guide plate 5200, thediffusion sheet 5400 and thelight collection sheets - As another example, when the blue light emitting module is used as the
light source 5100, at least one of thelight guide plate 5200, thediffusion sheet 5400, and the first and secondlight collection sheets light source 5100 generates blue light, since the green nanocomposite and the red nanocomposite generate green light and red light, the observer can recognize the light generated by thebacklight unit 5001 as white light. - As another example, when an ultraviolet light emitting module is used as the
light source 5100, at least one of thelight guide plate 5200, thediffusion sheet 5400, and first and secondlight collection sheets light guide plate 5200, thediffusion sheet 5400, and first and secondlight collection sheets diffusion sheet 5400 may include a blue nanocomposite, the firstlight collection sheet 5510 may include a green nanocomposite, and the secondlight collection sheet 5520 may include a red nanocomposite. Alternatively, any one of thelight guide plate 5200, thediffusion sheet 5400, and first and secondlight collection sheets light guide plate 5200, thediffusion sheet 5400, and first and secondlight collection sheets diffusion sheet 5400 may include a blue nanocomposite, and the firstlight collection sheet 5510 may include green and red nanocomposites. As the green, red and blue nanocomposites applied to thelight guide plate 5200, thediffusion sheet 5400, and the first and secondlight collection sheets backlight unit 5001 can provide white light to the display panel. - Referring to
FIG. 9 , abacklight unit 5002 according to another embodiment of the present invention includes alight source 5100, alight guide plate 5200, areflective plate 5300, anoptical sheet 5600, adiffusion sheet 5400, a firstlight collection sheet 5510 and a secondlight collection sheet 5520. Since thebacklight unit 5002 is substantially the same as thebacklight unit 5001 described with reference toFIG. 8 except that theoptical sheet 5600 is further included, detailed overlapping description thereof will be omitted. - The
optical sheet 5600 includes the nanocomposite, and is additionally included in thebacklight unit 5002 independently from thelight guide plate 5200, thediffusion sheet 5400, the firstlight collection sheet 5510 and the secondlight collection sheet 5520. Here, as thelight guide plate 5200, thediffusion sheet 5400, the firstlight collection sheet 5510 and the secondlight collection sheet 5520 those conventionally used in the art may be used. That is, as only theoptical sheet 5600 including the nanocomposites described with reference toFIGS. 1A to 1C and 3A to 3C is inserted into thebacklight unit 5002, a color gamut of the display device can be increased to improve color reproducibility. - According to the above description, as the nanocomposites described with reference to
FIGS. 1A to 1C and 3A to 3C are applied to at least one optical sheet among thelight guide plate 5200, thediffusion sheet 5400, the firstlight collection sheet 5510 and the secondlight collection sheet 5520, or a separate optical sheet independent from thelight guide plate 5200, thediffusion sheet 5400, the firstlight collection sheet 5510 and the secondlight collection sheet 5520, thebacklight units - Hereinafter, effects of the present invention observed through estimation of the color coordinates and color gamuts of the optical sheets according to embodiments and comparative examples, and the backlight unit and the display device including the same will be described.
- A blue light emitting module having an emission peak at about 444 nm was used as a light source, and a light guide plate, a diffusion sheet, a first light collection sheet and a second light collection sheet were manufactured through the following methods and prepared.
- After a benzotriazol-based ultraviolet light absorbent (trade name: Tinuvin-329, BASF SE, Germany) at 0.5 wt % and a hindered amine-based photostablizer (trade name: Tinuvin-770, BASF SE, Germany) at 0.5 wt % were mixed with a methylmethacrylate polymer at 100 wt %, a pellet type resin was manufactured using an extruder (inner diameter: 27 mm, L/D: 40, Leistritz Co.), and the resin was extruded using a sheet extruder to manufacture a light guide plate having a thickness of about 0.4 mm.
- First, after 20 mg of wax (trade name: Licowax PED 136 wax, Clariant Gmbh., Switzerland), which is oxidized high density polyethylene wax (oxidized HDPE Wax) serving as wax-based compound, having an acid value of about 30 mg KOH/g was mixed with 1 ml of toluene, a temperature of the wax was raised to about 150° C. and the wax-based compound was dissolved to manufacture a wax solution. After a solution in which about 20 mg of a CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was added into and mixed with the wax solution, the solution was cooled to room temperature, and the solution was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE. The photoinitiator was mixed at about 0.8 wt % with respect to 100 wt % urethane acrylate. Next, the toluene was removed using an evaporator to manufacture a first coating composition in which the urethane acrylate, a red nanocomposite and the photoinitiator were mixed. The first coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 μm to form a light diffusion layer having a shape shown in
FIG. 4C on a surface thereof. An average thickness of the light diffusion layer was about 50 μm. - Next, a solution in which about 20 mg of a CdSe-based green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was added into and mixed with the wax solution prepared in the process of manufacturing the red nanocomposite, and the solution was cooled to room temperature to be mixed with the urethane acrylate and photoinitiator. Next, the toluene was removed using the evaporator to manufacture a second coating composition in which the urethane acrylate, the photoinitiator and a green nanocomposite were mixed. The second coating composition was applied as a coating and cured on an opposite surface of the base substrate on which the light diffusion layer was formed to form an optical layer. A thickness of the optical layer was about 50 μm.
- Accordingly, a diffusion sheet including the base substrate, the light diffusion layer and the optical layer was manufactured.
- A catalyst (tetra-n-butylphosphoniumbromide) purchased from Nippon Industries Co. Ltd. (corporate name, Japan) was mixed at 0.07 wt % with bis(2,3-epithiopropyl)sulfide at 100 wt %, and the solution was agitated to manufacture a uniformized solution. The uniformized solution was agitated and defoamed, and then filtered through a polytetrafluroroethylene membrane (a PTFE membrane) having a thickness of about 0.5 μm to manufacture a base material. Next, the base material was applied on a PET film having a thickness of about 75 μm and pressed by a forming roller to manufacture a light collection pattern having a height of about 25 μm on the PET film, thereby manufacturing a first light collection sheet.
- A second light collection sheet was manufactured through substantially the same process as the method of manufacturing the first light collection sheet.
- The light guide plate, the diffusion sheet, the first light collection sheet and the second light collection sheet, which were manufactured through the methods described above, were sequentially deposited to assemble a blue light emitting module, and thus a backlight unit according to
Embodiment 1 of the present invention was prepared. - YAG phosphor purchased from Nichia Corporation (corporate name, Japan) was applied on a blue light emitting chip representing an emission peak at about 444 nm together with an OE-6630 silicon resin (trade name, Dow Corning Corporation, US) and then cured to manufacture a white light emitting module.
- Substantially the same backlight unit as
Embodiment 1 was prepared as the backlight unit according toEmbodiment 2, except that the white light emitting module was used as the light source. - First, substantially the same light guide plate as
Embodiment 1 was prepared. - A photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE (corporate name, Germany) was mixed at about 0.7 wt % with urethane acrylate at 100 wt % purchased from BASF SE, and a coat thereof was applied and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 μm to form a light diffusion layer having an average thickness of about 50 μm and a shape as shown in
FIG. 4 c on the surface thereof, thereby preparing a diffusion sheet. - In the first light collection sheet of
Embodiment 1, a second coating composition including a green nanocomposite described inEmbodiment 1 was applied as a coating and cured on the other surface opposite to the one surface of the PET film on which the light collection pattern was formed to form an optical layer having an average thickness of about 5 μm and a shape as shown inFIG. 4 d on a surface thereof, thereby preparing a first light collection sheet according toEmbodiment 3. - In addition, in the second light collection sheet of
Embodiment 1, a first coating composition including a red nanocomposite described inEmbodiment 1 was applied as a coating and cured on the other surface opposite to the one surface of the PET film on which the light collection pattern was formed to form an optical layer having an average thickness of about 5 μm and a shape as shown inFIG. 4 d on a surface thereof, thereby preparing a second light collection sheet according toEmbodiment 3. - The light guide plate, the diffusion sheet, the first light collection sheet and the second light collection sheet, which were prepared as described above, were assembled to the blue light emitting module representing an emission peak at about 444 nm to prepare a backlight unit according to
Embodiment 3 of the present invention. - Substantially the same backlight unit as that of
Embodiment 3 was prepared as a backlight unit according toEmbodiment 4 of the present invention, except that the white light emitting module describedEmbodiment 2 was used as the light source. - First, the diffusion sheet of
Embodiment 3 and the first light collection sheet and the second light collection sheet ofEmbodiment 1 were prepared. - In addition, the second coating composition including the green nanocomposite described in
Embodiment 1 was applied as a coating and cured on the one surface of the light guide plate ofEmbodiment 1 to form the first optical layer having a thickness of about 5 μm. Next, the first coating composition including the red nanocomposite described inEmbodiment 1 was applied as a coating and cured on the first optical layer to form the second optical layer having a thickness of about 5 μm. Accordingly, a light guide plate according toEmbodiment 5 of the present invention including the base substrate, and the first and second optical layers was manufactured. - The light guide plate, the diffusion sheet, and the first and second light collection sheets, which were prepared as described above, were assembled with the blue light emitting module representing an emission peak at about 444 nm to prepare a backlight unit according to
Embodiment 5 of the present invention. - The same backlight unit as that of
Embodiment 5 was prepared as a backlight unit ofEmbodiment 6 of the present invention, except that the white light emitting module was used as the light source. - Substantially the same backlight unit as that of
Embodiment 1 was prepared as a backlight unit according to Comparative example 1, except that the white light emitting module described inEmbodiment 2 was used as the light source and the diffusion sheet included in the backlight unit according toEmbodiment 3 was used. - Substantially the same backlight unit as that of
Embodiment 1 was prepared as a backlight unit according to Comparative example 2, except that, in the diffusion sheet, a red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was used instead of the red nanocomposite, and a green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was used instead of the green nanocomposite. - Substantially the same backlight unit as that of Comparative example 2 was prepared as a backlight unit according to Comparative example 3, except that the white light emitting module was used as the light source.
- Substantially the same backlight unit as that of
Embodiment 3 was prepared as a backlight unit according to Comparative example 4, except that the green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was used in the first light collection sheet instead of the green nanocomposite, and the red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was used in the second light collection sheet instead of the red nanocomposite. - Substantially the same backlight unit as that of Comparative example 2 was prepared as a backlight unit according to Comparative example 5, except that the white light emitting module was used as the light source.
- Substantially the same backlight unit as that of
Embodiment 5 was prepared as a backlight unit according to Comparative example 6, except that, in the light guide plate, the red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was used instead of the red nanocomposite and the green nano light-emitting body (trade name: Nanodot-HE-530, QD solution Co. Ltd., Korea) was used instead of the green nanocomposite. - Substantially the same backlight unit as that of Comparative example 6 was prepared as a backlight unit according to Comparative example 7, except that the white light emitting module was used as the light source.
- Each of the backlight units according to
Embodiments 1 to 6 and Comparative examples 1 to 7 was assembled to an iPhone 4 (trade name, Apple Inc., US) display panel to preparedisplay devices 1 to 6 andcomparative devices 1 to 7. - A color gamut, brightness and color coordinates (red, green, and blue) were measured with respect to the
display devices 1 to 6 and thecomparative devices 1 to 7 using SR-3AR (trade name, TOPCON Corporation, Japan) serving as a spectroradiometer. The red, green and blue color coordinates were obtained by causing theiPhone 4 display panels to display red, green and blue and then recording color coordinates represented by the spectroradiometer. The result is shown in the following Table 2. - In Table 2, the red, green and blue color coordinates are represented with respect to a CIE 1931 color coordinate system, and a chromatic ratio is a percentage of an area of a triangle formed by connecting RGB color coordinates of the display devices and comparative devices with respect to a chromatic range with respect to a National Television Systems Committee (NTSC) chromatic range (hereinafter referred to as an NTSC chromatic range).
-
TABLE 2 Color Color Color Chromatic Brightness coordinates - coordinates - coordinates - Classification ratio (%) (cd/m2) red (CIE 1931) green (CIE 1931) blue (CIE 1931) Display 89.2 350 (0.660, 0.319) (0.205, 0.705) (0.160, 0.123) device 1 Display 78.7 313 (0.652, 0.330) (0.210, 0.650) (0.160, 0.123) device 2 Display 80.4 340 (0.648, 0.325) (0.215, 0.667) (0.160, 0.123) device 3 Display 73.9 310 (0.630, 0.340) (0.220, 0.648) (0.160, 0.123) device 4 Display 84.5 330 (0.648, 0.319) (0.205, 0.689) (0.160, 0.123) device 5 Display 74.7 290 (0.633, 0.342) (0.224, 0.652) (0.160, 0.123) device 6 Comparative 51.3 314 (0.611, 0.354) (0.318, 0.564) (0.160, 0.123) device 1 Comparative 89.2 340 (0.665, 0.323) (0.230, 0.687) (0.160, 0.123) device 2 Comparative 76.9 305 (0.657, 0.336) (0.228, 0.642) (0.160, 0.123) device 3 Comparative 80.2 330 (0.650, 0.334) (0.219, 0.666) (0.160, 0.123) device 4 Comparative 74.0 300 (0.635, 0.355) (0.230, 0.650) (0.160, 0.123) device 5 Comparative 83.9 330 (0.655, 0.319) (0.230, 0.687) (0.160, 0.123) device 6 Comparative 75.5 285 (0.648, 0.336) (0.228, 0.642) (0.160, 0.123) device 7 -
FIG. 10 is an image for describing a color gamut of a display device including a backlight unit according to Comparative example 1, andFIGS. 11A to 11F are images for describing color gamuts of display devices including backlight units according toEmbodiments 1 to 6. - Referring to Table 2 and
FIGS. 10 and 11A to 11F, it will be appreciated that the color gamut of thecomparative device 1 including the backlight unit according to Comparative example 1 is about 51.3% of the NTSC chromatic range, whereas the color gamuts of thedisplay devices 1 to 6 are about 73.9% to about 89.2% of the NTSC chromatic range, and thus thedisplay devices 1 to 6 have remarkably larger color gamuts than thecomparative device 1. - Specifically, comparing the
comparative device 1 with thedisplay devices 1 to 6, it will be appreciated that, while the blue color coordinates are substantially similar to each other, red x coordinates of thedisplay devices 1 to 6 are higher than red x coordinates of thecomparative device 1. In addition, it will be appreciated that green x coordinates of thedisplay devices 1 to 6 are lower than green x coordinates of thecomparative device 1, and green y coordinates of thedisplay devices 1 to 6 are higher than green y coordinates of thecomparative device 1. - Referring to the above-mentioned results, it will be appreciated that color purity of red and green of the
display devices 1 to 6 is relatively larger than thecomparative device 1. That is, even when the same display panel is used, the display device can implement red and green having higher color purity by the backlight units according toEmbodiments 1 to 6 than the backlight unit according to Comparative example 1, and a color region that can be implemented by the display device is widened. - Furthermore, it will be appreciated that the
display devices 1 to 6 have the brightness substantially equal to or higher than the brightness of thecomparative device 1 even when the nanocomposites having the structure in which the nano light-emitting body is coated with the wax particles are distributed. - Meanwhile, it will be appreciated that the color purity of red and green is implemented at substantially the same level as the color purity of red and green of the
comparative devices 2 to 7 even when thedisplay devices 1 to 6 include the nanocomposites having the structures in which the nano light-emitting bodies are encapsulated by the wax particles. That is, it will be appreciated that the wax particles are not a factor that decreases quantum efficiency of the nano light-emitting body even when the nano light-emitting body is coated with the wax particles. - Wax (trade name: Licowax PED 136 wax, Clariant Gmbh, Switzerland), which is oxidized high density polyethylene wax (oxidized HDPE wax) serving as wax-based compound, having an acid value of about 30 mg KOH/g was mixed with 1 ml of toluene, and then a temperature of the wax was raised to about 150° C. to dissolve the wax-based compound, thereby manufacturing a wax solution. A solution in which about 20 mg of a CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was mixed with the wax solution, and then cooled to room temperature to manufacture a cooled solution.
- After the cooled solution was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE, the toluene was removed to manufacture a coating composition. The photoinitiator was mixed at about 0.8 wt % with respect to 100 wt % of urethane acrylate.
- The coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 μm to manufacture a
flat sheet 1 including an optical layer having a thickness of about 50 μm. - After 20 mg of the wax-based compound was mixed with 1 ml of toluene, the temperature of the mixture was increased to about 150° C. to dissolve the wax-based compound and manufacture the wax solution. After a solution in which about 20 mg of CdSe-based red quantum dots (trade name: Nanodot-HE-606, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was mixed with the wax solution, the solution was cooled to room temperature to manufacture a cooled solution in which about 10 mg of particles was distributed in 1 ml of toluene. Here, as the wax-based compound, a wax (trade name: Licowax PED 136 wax, Clariant Gmbh, Switzerland), which is an oxidized high density polyethylene wax (oxidized HDPE wax), having an acid value of about 50 mg KOH/g was used. After the cooled solution was mixed with a solution in which 10 ml of ethanol and 1 ml of TEOS (tetraethoxysilane, Sigma Aldrich Co. LLC., US) were mixed, 2.5 ml of ammonia water having a concentration of 30% was added to form silicon oxide on surfaces of the particles, thereby manufacturing a nanocomposite solution including a nanocomposite.
- The nanocomposite solution was centrifugally separated at about 5,000 rpm for about 30 minutes using a high speed centrifugal separator to separate the nanocomposite, the solution was cleaned using ethanol and distilled water, the ethanol and the distilled water were removed using the evaporator to manufacture the nanocomposite in a powder phase, and then the solution was distributed in the toluene again to manufacture a distributed solution.
- The distributed solution was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE, and then the toluene was removed to manufacture a coating composition. The photoinitiator was mixed at about 0.8 wt % with respect to 100 wt % of urethane acrylate.
- The coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 μm to manufacture a
flat sheet 2 including an optical layer having a thickness of about 50 μm. - After a solution in which about 20 mg of a CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE, the toluene was removed to manufacture a coating composition. The photoinitiator was mixed at about 0.8 wt % with respect to 100 wt % of urethane acrylate.
- The coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material having a thickness of about 38 μm to manufacture a
comparative sheet 1 including an optical layer having a thickness of about 50 μm. - The
flat sheets comparative sheet 1, which were manufactured as described above, were measured using an absolute quantum efficiency measurement device (trade name: C9920-02, HAMAMATSU Photonics K. K., Japan). Next, ultraviolet (UV) light having a central wavelength of 365 nm was radiated at a radiation intensity of about 1.4 mW/cm2 for 480 hours, i.e., under severe conditions of about 2,419.2 J/cm2, and then second quantum efficiency (QYT2, unit: %) was measured. A difference between the first quantum efficiency and the second quantum efficiency (ΔQY1=QYT1−QYT2, unit: %) was calculated to estimate ultraviolet light stability of the red nanocomposite of theflat sheets comparative sheet 1. - In addition, after the first quantum efficiency (
QYT 1, unit: %) was measured with respect to theflat sheets comparative sheet 1, the sheets were exposed to the thermo-hygrostat for 480 hours under severe conditions of a temperature of 85° C. and a relative humidity of 85%, and then a third quantum efficiency (QYT3, unit: %) was measured. A difference between the first quantum efficiency and the third quantum efficiency (ΔQY2=QYT1−QYT3, unit: %) was measured to estimate heat/moisture stability with respect to the red nanocomposite of theflat sheets comparative sheet 1. - The light stability estimation result and the heat/moisture stability estimation result are represented in the following Table 3.
- In Table 3, due to the light stability and heat/moisture stability of the
comparative sheet 1, no emission occurred after exposure to the severe condition, and thus the second quantum efficiency and the third quantum efficiency could not be measured. Accordingly, they are represented as “-” in Table 3. -
TABLE 3 Quantum Light Heat/moisture efficiency stability stability (QY, %) (ΔQY1, %) (ΔQY2, %) Flat sheet 178.1 6 7 Flat sheet 275.5 4 5 Comparative 32.5 — — sheet 1 - Referring to
FIG. 3 , it will be appreciated that quantum efficiency of the red nanocomposite included in theflat sheet 1 and the red nanocomposite included in theflat sheet 2 is better than quantum efficiency of that included in thecomparative sheet 1. That is, it will be appreciated that the quantum efficiency of the nanocomposites included in theflat sheets comparative sheet 1 is used in order to manufacture theflat sheets - On the other hand, it may be analogized that at least a part of the red nano light-emitting body is damaged during a process of manufacturing the
comparative sheet 1, for example, a step of mixing the red nano light-emitting body with urethane acrylate or a step of curing the urethane acrylate. - In particular, it will be appreciated that, in the light stability or heat/moisture stability, a damage level of the nanocomposites of the
flat sheets comparative sheet 1 to the severe conditions. - According to the above description, it will be appreciated that the nanocomposite having a structure in which the nano light-emitting body is coated with the wax particles is very stable with respect to light, heat and moisture, and the nanocomposite is not easily damaged due to light, heat or moisture even when the nanocomposite is mixed with a sheet-manufacturing composition such as urethane acrylate and cured to manufacture the sheet.
- Substantially the same backlight unit as that of
Embodiment 1 was prepared as a backlight unit according toEmbodiment 7 of the present invention, except that the light diffusion pattern having the shape shown inFIG. 4 c was formed on the surface of the optical layer of the diffusion sheet. - Substantially the same backlight unit as that of Comparative example 2 was prepared as a backlight unit according to Comparative example 8, except that the light diffusion pattern having the shape shown in
FIG. 4 c was further formed on the surface of the optical layer of the diffusion sheet. - In order to independently perform estimation of ultraviolet light stability and heat/moisture stability, two backlight units according to
Embodiment 7 and two backlight units according to Comparative example 8, which were described above, were prepared. - First, with respect to the backlight units according to
Embodiment 7 and Comparative example 8, initial brightness and initial color coordinates were measured using SR-3AR (trade name, TOPCON Corporation, Japan) serving as a spectroradiometer. - Next, the backlight units according to
Embodiment 7 and Comparative example 8 were selected one by one and the diffusion sheets were separated from the backlight units, and then ultraviolet (UV) light having a central wavelength of 365 nm was radiated to the diffusion sheet at a radiation intensity of about 1.4 mW/cm2 for 480 hours, i.e., under severe conditions of about 2,419.2 J/cm2. After the diffusion sheet irradiated with the ultraviolet light was assembled with the blue light emitting module, the light guide plate, and the first and second light collection sheets, final brightness and final color coordinates thereof were measured. The results are represented in Table 4. - In addition, after the diffusion sheets were separated from the other backlight units according to
Embodiment 7 and Comparative example 8, the diffusion sheets were left in the thermo-hygrostat under the severe conditions of a temperature of 85° C. and a relative humidity 85% for 480 hours. The diffusion sheets left in the high temperature/high humidity conditions were assembled to the blue light emitting module, the light guide plate, and the first and second light collection sheets again, and then final brightness and final color coordinates thereof were measured. The results are represented in Table 5. - The initial/final brightness and the initial/final color coordinates are average values of the values measured at nine points of the display section on which the light guide plate, the diffusion sheet, and the first and second light collection sheets were deposited, except for a portion of the backlight unit at which the light source was disposed. The 9 points are designated as shown in
FIG. 12 . - In
FIG. 12 , a light source is designated by LS, a display section on which a light guide plate, a diffusion sheet, and first and second light collection sheets are deposited is designated by DS, points 1, 2 and 3 in the display section DS adjacent to the light source LS are a light entering section, and points 7, 8 and 9 opposite to the light entering section are a light-facing section. Provided that a length in a lateral direction of the display section DS is referred to as a, and a length in a longitudinal direction is referred to as b, each of thepoints points points points points points points points points points points points - In Tables 4 and 5, the initial/final color coordinates are represented with reference to the CIE 1931 color coordinate system.
-
-
TABLE 4 Initial Initial color Final Final color Backlight brightness coordinates brightness coordinates classification (cd/m2) (CIE 1931) (cd/m2) (CIE 1931) Embodiment 76,207 (0.268, 0.273) 6,052 (0.267, 0.271) Comparative 3,502 (0.248, 0.199) 1,885 (0.225, 0.164) example 8 - Referring to Table 4, it will be appreciated that the initial brightness of the backlight unit according to
Embodiment 7 of the present invention was about 6,207 cd/m2, which is about 1.77 times the initial brightness of the backlight unit according to Comparative example 8 of about 3,502 cd/m2. In particular, it will be appreciated that the final brightness measured after the ultraviolet light in the severe conditions was applied to the backlight unit according toEmbodiment 7 of the present invention was reduced in comparison with the initial brightness by about 150 cd/m2, whereas the final brightness of the backlight unit according to Comparative example 8 was reduced by about 1,617 cd/m2, which is substantially half of the initial brightness. - In addition, it will be appreciated that, in the initial color coordinates and the final color coordinates of the backlight unit according to
Embodiment 7 of the present invention, a difference (Δx) of an x coordinate was about 0.001 and a difference (Δy) of a y coordinate was about 0.002, whereas a difference (Δx) between the initial color coordinates and the final color coordinates of the backlight unit according to Comparative example 8 was 0.023 and a difference (Δy) of a y coordinate was about 0.035. -
-
TABLE 5 Initial Initial color Final Final color Backlight brightness coordinates brightness coordinates classification (cd/m2) (CIE 1931) (cd/m2) (CIE 1931) Embodiment 76,207 (0.268, 0.273) 6,025 (0.263, 0.267) Comparative 3,502 (0.248, 0.199) 1,543 (0.213, 0.155) example 8 - Referring to
FIG. 5 , it will be appreciated that the final brightness measured after severe high temperature and high humidity conditions were applied to the backlight unit according toEmbodiment 8 of the present invention was reduced in comparison with the initial brightness by about 182 cd/m2, whereas the final brightness of the backlight unit according to Comparative example 8 was reduced by about 1,959 cd/m2, which is substantially half of the initial brightness. - In addition, it will be appreciated that, in the initial color coordinates and the final color coordinates of the backlight unit according to
Embodiment 8 of the present invention, a difference (Δx) of the x coordinate was about 0.005 and a difference (Δy) of the y coordinate was about 0.006, whereas a difference (Δx) between the initial color coordinates and the final color coordinates of the backlight unit according to Comparative example 8 is 0.035 and a difference (Δy) of the y coordinate is about 0.044. - According to the above description, it will be appreciated that, in consideration of the fact that the nano light-emitting body is applied to the diffusion sheet of the backlight unit according to Comparative example 8 and the nanocomposite is applied to the diffusion sheet of the backlight unit according to
Embodiment 7 of the present invention, the nanocomposite is not easily damaged during a process of manufacturing the diffusion sheet, and stability with respect to heat, moisture and light is better than that of the nano light-emitting body even in the diffusion sheet. - After a benzotriazol-based ultraviolet light absorbent (trade name: Tinuvin-329, BASF SE, Germany) at 0.5 wt % and a hindered amine-based photostablizer (trade name: Tinuvin-770, BASF SE, Germany) at 0.5 wt % were mixed with a methylmethacrylate polymer at 100 wt %, a pellet type resin was manufactured using an extruder (an inner diameter: 27 mm, L/D: 40, Leistritz. Co.), and the resin was extruded using a sheet extruder to manufacture an optical plate having a thickness of about 0.4 mm. A coating composition including a blue nanocomposite was coated on one surface of the optical plate to form an optical layer having a thickness of about 5 μm to manufacture a light guide plate.
- The coating composition was cooled to room temperature after the wax solution was mixed with a solution in which about 20 mg of a blue nano light-emitting body (trade name; Nanodot-HE-480, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene, and was mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE. The photoinitiator was mixed at about 0.8 wt % with the urethane acrylate at 100 wt %. Next, the solution was manufactured by removing the toluene using an evaporator.
- A photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE was mixed at about 0.7 wt % with urethane acrylate purchased from BASF SE (corporate name, Germany) at 100 wt %, and applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 μm to form a light diffusion layer having an average thickness of about 50 μm and a shape shown in
FIG. 4 c on a surface thereof, thereby preparing a diffusion sheet. - A catalyst (tetra-n-butylphosphoniumbromide) purchased from Nippon Industries Co. Ltd. (corporate name, Japan) was mixed at 0.07 wt % with bis(2,3-epithiopropyl)sulfide at 100 wt % and agitated at room temperature to manufacture a uniformized solution. The uniformized solution was agitated, defoamed, and then filtered through a polytetrafluoroethylene membrane (PTFE membrane) having a thickness of about 0.5 μm to manufacture a base material. Next, the solution was applied on a PET film having a thickness of about 75 μm and pressed by a forming roll to manufacture a light collection pattern having a height of about 25 μm on the PET film, thereby manufacturing a first light collection sheet.
- A second light collection sheet was manufactured through substantially the same process as the method of manufacturing the first light collection sheet.
- The light guide plate, the diffusion sheet, and the first and second light collection sheets, which were prepared as described above, were assembled to a white light emitting module manufactured by applying and curing YAG phosphor purchased from Nichia Corporation (corporate name, Japan) on a blue light emitting chip having an emission peak at about 444 nm together with an OE-6630 silicon resin (trade name, Dow Corning Corporation, US), thereby preparing a backlight unit according to
Embodiment 8 of the present invention. Here, the optical layer of the light guide plate was disposed at a light exiting surface of light provided from the light source. - After a benzotriazol-based ultraviolet light absorbent (trade name: Tinuvin-329, BASF SE, Germany) at 0.5 wt % and a hindered amine-based photostablizer (trade name: Tinuvin-770, BASF SE, Germany) at 0.5 wt % were mixed with a methylmethacrylate polymer at 100 wt %, a pellet type resin was manufactured using an extruder (inner diameter: 27 mm, L/D: 40, Leistritz. Co.), and then the resin was extruded using a sheet extruder to manufacture an optical plate having a thickness of about 0.4 mm serving as a light guide plate.
- After wax (trade name: Licowax PED 136 wax, Clariant Gmbh, Switzerland) 20 mg, which is oxidized high density polyethylene wax (oxidized HDPE wax) serving as a wax-based compound, having an acid value of about 30 mg KOH/g was mixed with 1 ml of toluene, the solution was increased to a temperature of about 150° C. to dissolve the wax-based compound and manufacture a wax solution. After a solution in which about 20 mg of a CdSe-based blue nano light-emitting body (trade name: Nanodot-HE-480, QD solution Co. Ltd., Korea) was distributed in 1 ml of toluene was added into and mixed with the wax solution, the solution was cooled to room temperature, and mixed with urethane acrylate purchased from BASF SE (corporate name, Germany) and a photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) purchased from BASF SE. The photoinitiator was mixed at about 0.8% with the urethane acrylate at 100 wt %. Next, the toluene was removed using an evaporator to manufacture a coating composition in which the urethane acrylate, a red nanocomposite and the photoinitiator were mixed. The coating composition was applied as a coating and cured on a transparent base substrate (trade name: XU42, Toray Industries, Inc., Japan) formed of a polyester material and having a thickness of about 38 μm to form a light diffusion layer having a shape as shown in
FIG. 4 c on a surface thereof. An average thickness of the light diffusion layer was about 50 μm. - Substantially the same first and second light collection sheets as described in
Embodiment 8 were prepared. - The light guide plate, the diffusion sheet, and the first and second light collection sheets, which were prepared as described above, were assembled to the white light emitting module described in
Embodiment 2 to prepare a backlight unit according toEmbodiment 9 of the present invention. - Substantially the same light guide plate as described in
Embodiment 9 was prepared, and substantially the same diffusion sheet as described inEmbodiment 8 was prepared. - A catalyst (tetra-n-butylphosphoniumbromide) purchased from Nippon Industries Co. Ltd. (corporate name, Japan) was mixed at 0.07 wt % with bis(2,3-epithiopropyl)sulfide at 100 wt % and agitated at room temperature to manufacture a uniformized solution. The uniformized solution was agitated, defoamed, and filtered through a polytetrafluoroethylene membrane (PTFE membrane) having a thickness of about 0.5 μm to manufacture a base material, and the base material was applied on a PET film having a thickness of about 75 μm and then pressed by a forming roll to manufacture a light collection pattern having a height of about 25 μm on the PET film, thereby manufacturing a first light collection sheet.
- After a light collection pattern was formed through substantially the same process as the method of manufacturing the first light collection sheet, a coating composition including the blue nanocomposite, the polyurethane acrylate and the photoinitiator (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, TPO) described in
Embodiment 9 was applied as a coating and cured on an opposite surface of the PET film on which the light collection pattern was formed, and an optical layer having a shape as shown inFIG. 4 d and an average thickness of about 5 μm was formed on the surface thereof to manufacture a second light collection sheet. - The light guide plate, the diffusion sheet, and the first and second light collection sheets, which were prepared as described above, were assembled to the white light emitting module to prepare a backlight unit according to Embodiment 10.
- Color coordinates of nine points of the backlight unit were measured as shown in
FIG. 12 with respect to the backlight unit according to Comparative example 1 and the backlight units according toEmbodiments 8 to 10. The results are represented in Table 6. - In Table 6, Δx represents a difference between a maximum value and a minimum value of x coordinates of the
points 1 to 9, and Δy represents a difference between a maximum value and a minimum value of y coordinates of thepoints 1 to 9. -
TABLE 6 Comparative Embodiment Embodiment Embodiment example 1 8 9 10 Point Color coordinates (x, y) 1 (0.297, 0.283) (0.295, 0.282) (0.295, 0.281) (0.294, 0.281) 2 (0.296, 0.281) (0.297, 0.283) (0.295, 0.281) (0.293, 0.278) 3 (0.298, 0.283) (0.299, 0.286) (0.299, 0.285) (0.296, 0.281) 4 (0.302, 0.290) (0.294, 0.283) (0.292, 0.282) (0.289, 0.278) 5 (0.301, 0.288) (0.296, 0.284) (0.294, 0.282) (0.291, 0.279) 6 (0.303, 0.289) (0.299, 0.287) (0.297, 0.285) (0.293, 0.280) 7 (0.311, 0.303) (0.295, 0.287) (0.293, 0.286) (0.289, 0.281) 8 (0.312, 0.303) (0.296, 0.287) (0.293, 0.284) (0.291, 0.281) 9 (0.314, 0.304) (0.298, 0.288) (0.295, 0.285) (0.292, 0.283) Δx 0.018 0.004 0.007 0.007 Δy 0.023 0.006 0.004 0.005 - Referring to Table 6, it will be appreciated that, in the backlight unit according to Comparative example 1, the light entering section adjacent to the light source, i.e., the color coordinates of the
points 1 to 3, have lower values for x coordinates and y coordinates than the color coordinates of thepoints 5 to 9 of the light-facing section facing the light entering section. On the other hand, it will be appreciated that, in the backlight units ofEmbodiments 7 to 9 of the present invention, the color coordinates of thepoints 1 to 3 had substantially the same numerical values as the color coordinates of thepoints 7 to 9. That is, it will be appreciated that, in the backlight units according toEmbodiments 7 to 9 of the present invention, there is almost no difference in color coordinates between the light entering section and the light-facing section. - Referring to Δx and Δy, it will be appreciated that the values of the backlight units according to
Embodiments 7 to 9 are remarkably smaller than the value in Comparative example 1. That is, in the backlight unit according to Comparative example 1, the light-facing section appears yellower to the observer than the light entering section due to a difference in color coordinates between the light entering section and the light-facing section. However, it will be appreciated that the difference in color coordinates of thepoints 1 to 9 is remarkably reduced by the optical sheet including the blue nanocomposite like the backlight units according toEmbodiments 7 to 9. Accordingly, as the blue nanocomposite is applied to at least one of the diffusion sheet, the light guide plate and the light collection sheet, the color coordinates of the backlight unit can be uniformly adjusted as a whole. - While the present invention has been described with reference to the exemplary embodiments, it will be apparent to those skilled in the art that the present invention can be variously modified and changed without departing from the spirit and the scope of the present invention disclosed in the accompanying claims.
Claims (48)
1. A nanocomposite comprising:
a wax particle;
at least one nano light-emitting body disposed in the wax particle; and
an inner protective layer formed of silicon oxide and configured to coat the nano light-emitting body.
2. The nanocomposite according to claim 1 , wherein the inner protective layer coats one nano light-emitting body.
3. The nanocomposite according to claim 2 , wherein the nano light-emitting bodies disposed in the wax particle have an emission peak in the same wavelength band.
4. The nanocomposite according to claim 2 , wherein at least two of the nano light-emitting bodies disposed in the wax particle have emission peaks in different wavelength bands.
5. The nanocomposite according to claim 1 , wherein the inner protective layer coats the two or more nano light-emitting bodies.
6. The nanocomposite according to claim 5 , wherein each of the nano light-emitting bodies has an emission peak in the same wavelength band.
7. The nanocomposite according to claim 5 , wherein at least two of the nano light-emitting bodies have emission peaks in different wavelength bands.
8. The nanocomposite according to claim 1 , further comprising an outer protective layer formed of silicon oxide and coating a surface of the wax particle.
9. The nanocomposite according to claim 8 , further comprising a wax layer formed on a surface of the outer protective layer and including a wax-based compound.
10. A nanocomposite comprising:
a wax particle;
at least one nano light-emitting body disposed in the wax particle; and
an outer protective layer formed of silicon oxide and coating the wax particle.
11. The nanocomposite according to claim 10 , wherein at least two of the nano light-emitting bodies in the wax particle have emission peaks in different wavelength bands.
12. The nanocomposite according to claim 10 , further comprising a wax layer formed on a surface of the outer protective layer and including a wax-based compound.
13. An optical member comprising:
a base substrate; and
a first optical layer disposed on one surface of the base substrate and in which at least one first nanocomposite is distributed,
wherein the first nanocomposite comprises:
a first wax particle; and
at least one first nano light-emitting body disposed in the first wax particle.
14. The optical member according to claim 13 , further comprising a second optical layer disposed on the other surface of the base substrate opposite to the one surface and in which at least one second nanocomposite is distributed,
wherein the second nanocomposite comprises:
a second wax particle; and
at least one second nano light-emitting body disposed in the second wax particle.
15. The optical member according to claim 13 , further comprising a third optical layer disposed on the first optical layer and in which at least one third nanocomposite is distributed,
wherein the third nanocomposite comprises:
a third wax particle; and
at least one third nano light-emitting body disposed in the third wax particle.
16. The optical member according to claim 13 , wherein at least one of the first and second nano light-emitting bodies is coated with an inner protective layer formed of silicon oxide.
17. The optical member according to claim 13 , wherein at least one of the first and second wax particles is coated with an outer protective layer formed of silicon oxide.
18. The optical member according to claim 15 , wherein at least one of the first to third wax particles is coated with an outer protective layer formed of silicon oxide.
19. The optical member according to claim 17 , wherein at least one of the first and second nanocomposites further comprises a wax layer formed of a wax-based compound and coating the outer protective layer.
20. The optical member according to claim 18 , wherein at least one of the first to third nanocomposites further comprises a wax layer formed of a wax-based compound and coating the outer protective layer.
21. The optical member according to claim 13 , wherein at least one of the first and second optical layers comprises an optical pattern.
22. The optical member according to claim 15 , wherein at least one of the first to third optical layers comprises an optical pattern.
23. The optical member according to claim 13 , wherein the first optical layer includes a plurality of first nanocomposites, and each of the first nanocomposites includes at least one selected from a red nano light-emitting body; a green nano light-emitting body; and a blue nano light-emitting body disposed in the first wax particle.
24. The optical member according to claim 13 , further comprising a light diffusion layer formed on the first optical layer.
25. The optical member according to claim 14 , further comprising a light diffusion layer formed on the second optical layer.
26. A diffusion sheet comprising:
a base substrate; and
a first optical layer formed on one surface of the base substrate, including at least one first nanocomposite, and having a light diffusion pattern formed on a surface thereof,
wherein the first nanocomposite comprises:
a first wax particle; and
at least one first nano light-emitting body disposed in the first wax particle.
27. The diffusion sheet according to claim 26 , wherein a plurality of first nano light-emitting bodies included in the first wax particle have an emission peak in the same wavelength band.
28. The diffusion sheet according to claim 16 , wherein at least two first nano light-emitting bodies included in the first wax particle have emission peaks in different wavelength bands.
29. The diffusion sheet according to claim 26 , further comprising a second optical layer including at least one second nanocomposite disposed on the other surface opposite to the one surface,
wherein the second nanocomposite comprises:
a second wax particle; and
at least one second nano light-emitting body disposed in the second wax particle.
30. The diffusion sheet according to claim 29 , wherein a plurality of second nano light-emitting bodies included in the second wax particle have an emission peak in the same wavelength band.
31. The diffusion sheet according to claim 29 , wherein at least two second nano light-emitting bodies included in the second wax particle have emission peaks in different wavelength bands.
32. The diffusion sheet according to claim 29 , wherein a light diffusion pattern is formed on a surface of the second optical layer.
33. The diffusion sheet according to claim 29 , wherein a peak wavelength of light generated from the first nano light-emitting body is larger than a peak wavelength of light generated from the second nano light-emitting body.
34. The diffusion sheet according to claim 33 , wherein the first nano light-emitting body has an emission peak at 600 nm to 660 nm, and the second nano light-emitting body has an emission peak at 520 nm to 560 nm.
35. The diffusion sheet according to claim 29 , further comprising an intermediate layer disposed between the base substrate and the second optical layer, the intermediate layer including at least one third nanocomposite,
wherein the third nanocomposite comprises:
a third wax particle; and
at least one third nano light-emitting body disposed in the third wax particle.
36. The diffusion sheet according to claim 26 , further comprising an intermediate layer disposed between the base substrate and the first optical layer, the intermediate layer including at least one third nanocomposite,
wherein the third nanocomposite comprises:
a third wax particle; and
at least one third nano light-emitting body disposed in the third wax particle.
37. The diffusion sheet according to claim 26 , further comprising a second optical layer disposed on the other surface of the base substrate opposite to the one surface, second optical layer having a light collection pattern formed on a surface thereof.
38. A diffusion sheet comprising:
a base substrate;
a light diffusion layer formed on one surface of the base substrate; and
a first optical layer formed on the other surface of the base substrate opposite to the one surface, the first optical layer including at least one first nanocomposite,
wherein the first nanocomposite comprises:
a first wax particle; and
at least one first nano light-emitting body disposed in the first wax particle.
39. The diffusion sheet according to claim 38 , wherein a plurality of first nano light-emitting bodies included in the first wax particle have an emission peak in the same wavelength band.
40. The diffusion sheet according to claim 38 , further comprising a second optical layer disposed on the first optical layer, the second optical layer including at least one second nanocomposite,
wherein the second nanocomposite comprises:
a second wax particle; and
at least one second nano light-emitting body disposed in the second wax particle.
41. The diffusion sheet according to claim 40 , wherein the first nano light-emitting body and the second nano light-emitting body have emission peaks in different wavelength bands.
42. The diffusion sheet according to claim 38 , further comprising a light diffusion layer formed on the first optical layer.
43. A light collection sheet comprising:
a base substrate; and
a light collection pattern disposed on the base substrate, light collection pattern including a nanocomposite having at least one nano light-emitting body disposed in a wax particle.
44. A light collection sheet comprising:
a base substrate;
a light collection pattern disposed on one surface of the base substrate; and
an optical layer disposed on the other surface of the base substrate opposite to the one surface, the optical layer including a nanocomposite,
wherein the nanocomposite comprises:
a wax particle; and
at least one nano light-emitting body disposed in the wax particle.
45. The light collection sheet according to claim 44 , wherein a light diffusion pattern is formed on a surface of the optical layer.
46. A backlight unit comprising:
a light source;
a diffusion sheet configured to receive light from the light source; and
a light collection sheet disposed on the diffusion sheet,
wherein at least one of the diffusion sheet and the light collection sheet comprises at least one nanocomposite including a wax particle and at least one nano light-emitting body disposed in the wax particle.
47. The backlight unit according to claim 46 , wherein the light source comprises a blue light emitting module.
48. The backlight unit according to claim 46 , wherein the wax particle of each of the plurality of nanocomposites comprises at least one selected from a red nano light-emitting body and a green nano light-emitting body.
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KR10-2013-0032896 | 2013-03-27 | ||
PCT/KR2013/010092 WO2014073893A1 (en) | 2012-11-09 | 2013-11-07 | Nanocomposite, and optical member and backlight unit comprising same |
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US14/442,083 Abandoned US20160068749A1 (en) | 2012-11-09 | 2013-11-07 | Composite, composition containing the same, and apparatus |
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Also Published As
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US20160068749A1 (en) | 2016-03-10 |
KR20140060215A (en) | 2014-05-19 |
KR20140144167A (en) | 2014-12-18 |
KR20140060218A (en) | 2014-05-19 |
KR20140060216A (en) | 2014-05-19 |
KR20140060222A (en) | 2014-05-19 |
KR101426449B1 (en) | 2014-08-05 |
KR101575143B1 (en) | 2015-12-07 |
KR20140060449A (en) | 2014-05-20 |
KR101396871B1 (en) | 2014-05-19 |
KR101525770B1 (en) | 2015-06-04 |
US9884992B2 (en) | 2018-02-06 |
KR101426448B1 (en) | 2014-08-05 |
KR101503290B1 (en) | 2015-03-18 |
US20150301257A1 (en) | 2015-10-22 |
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