WO2022176468A1 - 自発光ディスプレイ及び自発光ディスプレイ用樹脂フィルムの製造方法 - Google Patents
自発光ディスプレイ及び自発光ディスプレイ用樹脂フィルムの製造方法 Download PDFInfo
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- WO2022176468A1 WO2022176468A1 PCT/JP2022/001171 JP2022001171W WO2022176468A1 WO 2022176468 A1 WO2022176468 A1 WO 2022176468A1 JP 2022001171 W JP2022001171 W JP 2022001171W WO 2022176468 A1 WO2022176468 A1 WO 2022176468A1
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- RWVGQQGBQSJDQV-UHFFFAOYSA-M sodium;3-[[4-[(e)-[4-(4-ethoxyanilino)phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]-2-methylcyclohexa-2,5-dien-1-ylidene]methyl]-n-ethyl-3-methylanilino]methyl]benzenesulfonate Chemical compound [Na+].C1=CC(OCC)=CC=C1NC1=CC=C(C(=C2C(=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C)C=2C(=CC(=CC=2)N(CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C)C=C1 RWVGQQGBQSJDQV-UHFFFAOYSA-M 0.000 description 1
- UWGCNDBLFSEBDW-UHFFFAOYSA-M sodium;4-[[4-(diethylamino)phenyl]-(4-diethylazaniumylidenecyclohexa-2,5-dien-1-ylidene)methyl]naphthalene-2,7-disulfonate Chemical compound [Na+].C1=CC(N(CC)CC)=CC=C1C(C=1C2=CC=C(C=C2C=C(C=1)S([O-])(=O)=O)S([O-])(=O)=O)=C1C=CC(=[N+](CC)CC)C=C1 UWGCNDBLFSEBDW-UHFFFAOYSA-M 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 239000000988 sulfur dye Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XBFJAVXCNXDMBH-UHFFFAOYSA-N tetracyclo[6.2.1.1(3,6).0(2,7)]dodec-4-ene Chemical compound C1C(C23)C=CC1C3C1CC2CC1 XBFJAVXCNXDMBH-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- JADVWWSKYZXRGX-UHFFFAOYSA-M thioflavine T Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1C1=[N+](C)C2=CC=C(C)C=C2S1 JADVWWSKYZXRGX-UHFFFAOYSA-M 0.000 description 1
- 239000001003 triarylmethane dye Substances 0.000 description 1
- WDWBPYFNRWQKNZ-UHFFFAOYSA-K trisodium 5-[(4-anilino-6-chloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(2-sulfonatophenyl)diazenyl]naphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].[Na+].[O-]S(=O)(=O)C1=CC2=CC(S([O-])(=O)=O)=CC(NC=3N=C(NC=4C=CC=CC=4)N=C(Cl)N=3)=C2C(O)=C1N=NC1=CC=CC=C1S([O-])(=O)=O WDWBPYFNRWQKNZ-UHFFFAOYSA-K 0.000 description 1
- 239000000984 vat dye Substances 0.000 description 1
- 239000001018 xanthene dye Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Definitions
- the present invention relates to a method for producing a self-luminous display and a resin film for a self-luminous display.
- Liquid crystal displays have been developed as non-self-luminous displays that display images by transmitting or not transmitting light from a light source.
- a resin film for protecting the liquid crystal panel may be provided (Patent Document 1).
- a self-luminous display that realizes image display by emitting light from the display element itself is also progressing.
- an optical laminate having a retardation plate and a polarizer is incorporated into an organic electroluminescence display (organic EL display), which is a self-luminous display (Patent Document 2).
- an electrode is usually provided in the pixel in order to make the pixel function. It may be used as an electrode.
- the self-luminous display has a reflective element such as a reflective electrode, external light incident on the self-luminous display is reflected by the reflective element with a certain reflectance and is visually recognized as reflected light, resulting in a decrease in the contrast of the self-luminous display. Sometimes. Therefore, it is required to reduce the reflectance of the self-luminous display.
- the present inventors have developed a self-luminous display including a predetermined self-luminous panel and a resin film that includes a colored layer and satisfies a predetermined condition for an average value of in-line transmittance. , found that the above problems can be solved, and completed the present invention. That is, the present invention provides the following.
- the resin film includes a colored layer containing a resin material and a colorant, and the average linear transmittance AvS at a wavelength of 480 nm or more and 610 nm or less is lower than the average linear transmittance AvL at a wavelength of 700 nm or more and 800 nm or less.
- a small, self-luminous display The resin film further includes a first resin layer and a second resin layer, and the colored layer is disposed between the first resin layer and the second resin layer. , the self-luminous display according to [1].
- a self-luminous display whose reflectance is reduced to a level that is practical indoors; a method for producing a self-luminous display resin film that can reduce the reflectance of a self-luminous display to a level that is practical indoors. ; can be provided.
- FIG. 1 is a cross-sectional view schematically showing a self-luminous display according to one embodiment of the invention.
- FIG. 2 is a cross-sectional view schematically showing a self-luminous display according to another embodiment of the invention.
- the "agent” may be a single type of substance, or may include multiple types of substances.
- a "long" film refers to a film having a length of 5 times or more, preferably 10 times or more, with respect to the width, specifically a roll A film that is long enough to be rolled up into a shape and stored or transported.
- the upper limit of the length of the film is not particularly limited, and can be, for example, 100,000 times or less the width.
- nx represents the refractive index in the direction (in-plane direction) perpendicular to the thickness direction of the layer, which gives the maximum refractive index.
- ny represents the refractive index in the in-plane direction of the layer and in the direction orthogonal to the nx direction.
- d represents the thickness of the layer.
- the measurement wavelength is 590 nm unless otherwise stated.
- the terms “parallel”, “perpendicular” and “perpendicular” in the directions of the elements are within a range that does not impair the effects of the present invention, such as ⁇ 3°, ⁇ 2° or ⁇ 1°, unless otherwise specified. may contain an error within the range of
- a self-luminous display includes a self-luminous panel having a reflectance of 40% or less, and a resin film arranged on the viewing side of the self-luminous panel.
- the resin film includes a colored layer containing a resin material and a coloring agent, and the average value AvS of the linear transmittance at a wavelength of 480 nm or more and 610 nm or less is the average value of the linear transmittance at a wavelength of 700 nm or more and 800 nm or less. less than the value AvL.
- the self-luminous display of the present embodiment has the above configuration, it is possible to reduce the reflectance of the self-luminous display to a level that is practical indoors.
- FIG. 1 is a cross-sectional view schematically showing a self-luminous display according to one embodiment of the invention.
- Self-luminous display 100 includes self-luminous panel 110 and resin film 120 .
- Self-luminous panel 110 has an image display surface 110U on which an image is displayed, and resin film 120 is arranged on the viewing side of self-luminous panel 110, that is, on the image display surface 110U side.
- resin film 120 is provided on image display surface 110U of self-luminous panel 110 .
- the resin film 120 is also a colored layer, which will be described later.
- the resin film 120 is directly attached to the self-luminous panel 110, but in another embodiment, an adhesive layer (pressure-sensitive adhesive layer) or the like is provided between the resin film 120 and the self-luminous panel 110. Other layers may be arranged.
- the self-luminous panel and the resin film included in the self-luminous display of this embodiment will be described below.
- a self-luminous panel means a panel that displays an image by the display element itself emitting light without requiring a light source such as a backlight.
- Examples of self-luminous panels include panels with micro light emitting diode display elements (micro LED display elements) and panels with organic electroluminescence display elements (organic EL display elements).
- a self-luminous panel usually has an electrode for causing a display element to emit light, and external light incident on the self-luminous panel is usually reflected by the electrode at a predetermined rate.
- the self-luminous panel according to the present embodiment usually has a reflectance of 40% or less, preferably 30% or less, more preferably 20% or less, usually 0% or more, may be 5% or more, or 10%. % or more.
- the reflectance of the self-luminous panel can be measured with a spectrophotometer under the condition that the measurement light source is a D65 light source and the measurement optical system is Specular Component Include (SCI).
- the measurement light source is a D65 light source and the measurement optical system is Specular Component Include (SCI).
- the resin film according to this embodiment includes a colored layer containing a resin material and a coloring agent.
- the average value AvS of linear transmittance at wavelengths of 480 nm to 610 nm is smaller than the average value AvL of linear transmittances at wavelengths of 700 nm to 800 nm.
- the resin material that can be contained in the colored layer is not particularly limited, but is preferably thermoplastic.
- the resin material can usually contain a polymer and optionally optional components.
- polymers that can be contained in the resin material include cyclic olefin polymers such as norbornene polymers and hydrides thereof; polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate.
- polyarylene sulfide such as polyphenylene sulfide; polyvinyl alcohol; polycarbonate; polyarylate; acrylic polymer such as polymethyl methacrylate; cellulose ester polymer; is mentioned.
- One type of polymer may be used alone, or two or more types may be used in combination at any ratio.
- the polymer may be a homopolymer or a copolymer.
- the proportion of the polymer in the resin material is preferably 50% by weight or more, more preferably 60% by weight or more, still more preferably 70% by weight or more, still more preferably 80% by weight or more, still more preferably 90% by weight or more, and even more preferably is 95% by weight or more, usually 100% by weight or less, and may be 100% by weight.
- the resin material preferably contains one or more selected from the group consisting of cyclic olefin polymers and their hydrides, because they have excellent properties such as transparency, mechanical strength, and heat and humidity resistance.
- the proportion of the cyclic olefin polymer and its hydride in the resin material is preferably 50% by weight or more, more preferably 60% by weight or more, still more preferably 70% by weight or more, and still more preferably 80% by weight. Above, more preferably 90% by weight or more, more preferably 95% by weight or more, usually 100% by weight or less, and may be 100% by weight.
- a cyclic olefin polymer is a polymer containing a structural unit having a structure obtained by polymerizing a cyclic olefin monomer.
- Examples of cyclic olefin polymers include monocyclic cyclic olefin polymers and polycyclic cyclic olefin polymers.
- the resin material more preferably contains one or more selected from the group consisting of polycyclic cyclic olefin polymers and hydrides thereof. and more preferably one or more selected from the group consisting of norbornene-based polymers and their hydrides.
- the resin material more preferably contains a hydride of a cyclic olefin polymer, more preferably a hydride of a norbornene polymer.
- Examples of norbornene-based polymers and hydrides thereof include ring-opening polymers of monomers having a norbornene structure, or ring-opening copolymers of monomers having a norbornene structure and other monomers; or an addition copolymer of a monomer having a norbornene structure and another monomer; and hydrides thereof.
- ring-opening (co)polymer hydrides of monomers having a norbornene structure are particularly preferred from the viewpoints of transparency, moldability, heat resistance, low hygroscopicity, dimensional stability, and lightness. is.
- (co)polymer” refers to polymers and copolymers.
- Monomers having a norbornene structure include, for example, bicyclo[2.2.1]hept-2-ene (common name: norbornene), tricyclo[4.3.0.1 2,5 ]deca-3,7 -diene (common name: dicyclopentadiene), 7,8-benzotricyclo[4.3.0.1 2,5 ]dec-3-ene (common name: methanotetrahydrofluorene), tetracyclo[4.4. 0.1 2,5 . 1 7,10 ]dodeca-3-ene (common name: tetracyclododecene) and derivatives of these compounds (eg, those having a substituent on the ring).
- substituents include an alkyl group, an alkylene group, and a polar group. Moreover, these substituents may be the same or different, and a plurality of them may be bonded to the ring. Moreover, the monomer having a norbornene structure may be used singly, or two or more of them may be used in combination at an arbitrary ratio.
- Types of polar groups include, for example, heteroatoms or atomic groups having heteroatoms.
- Heteroatoms include, for example, oxygen atoms, nitrogen atoms, sulfur atoms, silicon atoms, and halogen atoms.
- Specific examples of polar groups include carboxyl groups, carbonyloxycarbonyl groups, epoxy groups, hydroxyl groups, oxy groups, ester groups, silanol groups, silyl groups, amino groups, nitrile groups and sulfonic acid groups.
- monomers capable of ring-opening copolymerization with monomers having a norbornene structure include, for example, monocyclic olefins such as cyclohexene, cycloheptene and cyclooctene, and derivatives thereof; cyclic conjugates such as cyclohexadiene and cycloheptadiene; dienes and derivatives thereof; and the like.
- the monomer having a norbornene structure and other monomer capable of ring-opening copolymerization may be used singly or in combination of two or more at any ratio.
- a ring-opening polymer of a monomer having a norbornene structure, and a ring-opening copolymer of another monomer copolymerizable with a monomer having a norbornene structure and a monomer having a norbornene structure are, for example,
- the monomer may be produced by polymerizing or copolymerizing in the presence of a known ring-opening polymerization catalyst.
- monomers capable of addition copolymerization with monomers having a norbornene structure include, for example, ⁇ -olefins having 2 to 20 carbon atoms such as ethylene, propylene and 1-butene, and derivatives thereof; cyclobutene, cyclopentene, cycloolefins such as cyclohexene and derivatives thereof; non-conjugated dienes such as 1,4-hexadiene, 4-methyl-1,4-hexadiene and 5-methyl-1,4-hexadiene; Among these, ⁇ -olefins are preferred, and ethylene is more preferred.
- the monomer having a norbornene structure and other monomer capable of addition copolymerization may be used singly, or two or more thereof may be used in combination at an arbitrary ratio.
- Addition polymers of monomers having a norbornene structure, and addition copolymers of monomers having a norbornene structure and other monomers copolymerizable with the monomers having a norbornene structure are, for example, monomers may be prepared by polymerization or copolymerization in the presence of known addition polymerization catalysts.
- norbornene-based polymers and their hydrides include "Zeonor” manufactured by Nippon Zeon; "Arton” manufactured by JSR; and “TOPAS” manufactured by TOPAS ADVANCED POLYMERS.
- Examples of monocyclic cyclic olefin-based polymers and hydrogenated products thereof include addition polymers of cyclic olefin-based monomers having a single ring such as cyclohexene, cycloheptene, and cyclooctene, and hydrogenated products thereof.
- the weight average molecular weight (Mw) of the polymer that can be contained in the resin material is preferably 10,000 or more, more preferably 15,000 or more, still more preferably 20,000 or more, and preferably 200,000 or less. It is preferably 100,000 or less, more preferably 80,000 or less.
- a polymer having such a weight average molecular weight has an excellent balance of mechanical strength, moldability and heat resistance.
- the molecular weight distribution (Mw/Mn) of the polymer that can be contained in the resin material is preferably 1 or more, preferably 4 or less, more preferably 3.5 or less.
- Mw/Mn The molecular weight distribution of the polymer that can be contained in the resin material.
- the weight-average molecular weight Mw and number-average molecular weight Mn of the polymer that can be contained in the resin material are obtained by gel permeation chromatography (hereinafter abbreviated as "GPC") using cyclohexane as a solvent, and are converted to polyisoprene.
- GPC gel permeation chromatography
- the resin does not dissolve in cyclohexane, it can be measured in terms of polystyrene by GPC using toluene or tetrahydrofuran as a solvent.
- the glass transition temperature of the polymer that can be contained in the resin material is preferably 50°C or higher, more preferably 70°C or higher, and preferably 200°C or lower, more preferably 180°C or lower.
- optional ingredients that the resin material may contain in addition to the polymer include antioxidants; plasticizers; UV absorbers; and lubricants.
- Optional components included in the resin material do not include colorants.
- one type may be used alone, or two or more types may be used in combination at an arbitrary ratio.
- the total proportion of any components other than the polymer in the resin material is preferably 5% by weight or less, more preferably 3% by weight or less, and still more preferably 1% by weight or less, and is usually 0% by weight or more, and 0% by weight. %.
- Colorant examples include pigments and dyes that have a wavelength range with a transmittance of 75% or less in the visible light range (480 nm to 610 nm). As the colorant, only one kind may be used, or two or more kinds may be used in combination at an arbitrary ratio.
- a pigment is preferable as the colorant from the viewpoint of the weather resistance of the resin film.
- dyes are preferred as colorants.
- a dye as a coloring agent has the following advantages. Dyes generally have better dispersibility in resin materials than pigments, and can improve the productivity of resin films. In addition, in the infrared region of 700 nm or more, the light transmittance of the resin film is hardly lowered. Therefore, when various optical sensors such as an infrared sensor are combined with the self-luminous display, the detection function of the optical sensor is less likely to deteriorate.
- the dyes are also sufficiently weatherfast in indoor conditions where there is no direct exposure to sunlight.
- dyes examples include oil-soluble dyes, disperse dyes, direct dyes, reactive dyes, sulfur dyes, vat dyes, acid dyes, metallized dyes, metallized acid dyes, basic dyes, mordant dyes, acid mordant dyes, cationic Dyes, and fluorescent brightening dyes.
- oil-soluble dyes and disperse dyes are particularly preferable from the viewpoint of good coloring of the colored layer containing the resin material.
- the type of compound contained in the dye is not particularly limited.
- dyes containing various compounds may be used. Examples of dyes containing these various compounds include anthraquinone dyes, azo dyes, azine dyes, nigrosine dyes, phthalocyanine dyes, methine dyes, oxazine dyes, quinoline dyes, indigo dyes, and indigoid dyes. , carbonium dyes, threne dyes, perinone dyes, perylene dyes, triarylmethane dyes, and xanthene dyes.
- black coloring dyes include solvent black 3, 5, 7, 22, 27, 29 or 34, modant black 1, 11 or 17, acid black 2 or 52, or direct black 19 or 154.
- product names include "NUBIAN” (registered trademark) BLACK TH-807, TH-827, TH -827K, TN-870, PC-0855, PC-5856, PC-5857, PC-5877, PC-8550, TN-873, TN-877 or AH-807, OIL BLACK HBB or 860, "VALIFAST” (registered trademark) BLACK 1807, 3904, 3810, 3820, 3830, 3840, 3866 or 3870 or WATER BLACK 100-L, 191-L, 256- L, R-510 or 187-LM (all manufactured by Orient Chemical Industry Co., Ltd.).
- red coloring dyes examples include Direct Red 2, 4, 9, 23, 26, 28, 31, 39, 62, 63, 72, 75, 76, 79, 80, 81, 83, 84, 89, 92, 95, 111, 173, 184, 207, 211, 212, 214, 218, 221, 223, 224, 225, 226, 227, 232, 233, 240, 241, 242, 243 or 247, acid red 35, 42, 51, 52, 57, 62, 80, 82, 111, 114, 118, 119, 127, 128, 131, 143, 145, 151, 154, 157, 158, 211, 249, 254, 257, 261, 263, 266, 289, 299, 301, 305, 319, 336, 337, 361, 396 or 397, reactive red 3, 13, 17, 19, 21, 22, 23, 24, 29, 35, 37, 40 , 41, 43, 45, 49 or 55, or Basic Red 12, 13, 14, 15, 18, 22, 23, 24, 25, 27,
- dyes that color orange include Basic Orange 21 or 23 (all the numbers listed above indicate the C.I. number).
- yellow coloring dyes examples include Direct Yellow 8, 9, 11, 12, 27, 28, 29, 33, 35, 39, 41, 44, 50, 53, 58, 59, 68, 87, 93, 95, 96, 98, 100, 106, 108, 109, 110, 130, 142, 144, 161 or 163, acid yellow 17, 19, 23, 25, 39, 40, 42, 44, 49, 50, 61, 64, 76, 79, 110, 127, 135, 143, 151, 159, 169, 174, 190, 195, 196, 197, 199, 218, 219, 222 or 227, reactive yellow 2, 3, 13, 14 , 15, 17, 18, 23, 24, 25, 26, 27, 29, 35, 37, 41 or 42 or basic yellow 1, 2, 4, 11, 13, 14, 15, 19, 21, 23 , 24, 25, 28, 29, 32, 36, 39, or 40 (all the numbers listed above indicate CI numbers).
- dyes that color green include Acid Green 16 (above, the numbers indicate C.I. numbers).
- dyes that color blue include Acid Blue 9, 45, 80, 83, 90, or 185 (the numbers listed above all indicate C.I. numbers).
- dyes coloring purple examples include direct violet 7, 9, 47, 48, 51, 66, 90, 93, 94, 95, 98, 100 or 101, acid violet 5, 9, 11, 34, 43, 47, 48, 51, 75, 90, 103 or 126, reactive violet 1, 3, 4, 5, 6, 7, 8, 9, 16, 17, 22, 23, 24, 26, 27, 33 or 34 , or Basic Violet 1, 2, 3, 7, 10, 15, 16, 20, 21, 25, 27, 28, 35, 37, 39, 40 or 48 (any number listed above also indicates the C.I. number).
- dyes include “SUMILAN” (registered trademark) dye, “LANYL dye” (registered trademark) (all of these are manufactured by Sumitomo Chemical Co., Ltd.), “ORASOL” (registered trademark) dye, “ORACET” ( Registered trademark) dye, “FILAMID” (registered trademark) dye, “IRGASPERSE” (registered trademark) dye (all of these are manufactured by Ciba Specialty Chemicals), “ZAPON” (registered trademark) dye, “NEOZAPON” (registered Trademark) dye, “NEPTUNE” (registered trademark) dye, “ACIDOL” (registered trademark) dye (all of these are manufactured by BASF), “KAYASET” (registered trademark) dye, “KAYAKALAN” (registered trademark) dye (above, Nippon Kayaku Co., Ltd.), “VALIFAST” (registered trademark) COLORS dyes, “NUBIAN” (registered trademark) COLORS dyes, “
- the weight ratio of the colorant contained in the colored layer is preferably 0.001% by weight or more, more preferably 0.01% by weight or more, and still more preferably 0%, based on the total of all materials forming the colored layer being 100% by weight. 0.05% by weight or more, preferably 1% by weight or less, more preferably 0.8% by weight or less, and even more preferably 0.5% by weight or less.
- the weight ratio of the colorant is equal to or higher than the lower limit, the desired optical properties can be imparted to the thin resin film.
- the weight ratio of the colorant is equal to or less than the above upper limit, bleeding out of the colorant from the colored layer can be reduced, and the colorant can be better dispersed in the colored layer.
- the colorant contained in the colored layer preferably has an average transmittance TrS at a wavelength of 480 nm or more and 610 nm or less, which is smaller than an average transmittance TrL at a wavelength of 700 nm or more and 800 nm or less. That is, the difference (TrL-TrS) between the average value TrL and the average value TrS is greater than zero.
- the transmittance of the coloring agent can be measured using a spectrophotometer. As the average transmittance in a predetermined wavelength range, the transmittance of the colorant is measured every 1 nm in the wavelength range, and the arithmetic mean of the transmittances measured every 1 nm can be used.
- the transmittance of the coloring agent can be measured under the following conditions.
- Solvent A solvent capable of dissolving or dispersing the coloring agent can be used.
- the solvent may be a mixed solvent.
- solvents include organic solvents such as toluene, xylene, methyl ethyl ketone (MEK), acetone and ethanol; water; and mixed solvents thereof.
- MEK methyl ethyl ketone
- ⁇ Cell Quartz cell with an optical path length of 10 mm
- Concentration 0.01% by weight First, a colorant is dissolved or dispersed in a solvent to prepare a solution or dispersion having a colorant concentration of 0.01% by weight. A dispersant may be used.
- This solution or dispersion is placed in a quartz cell with an optical path length of 10 mm and used as a measurement sample, and the transmittance is measured with a spectrophotometer. At this time, the transmittance measured by placing only the used solvent in a quartz cell is defined as 100%.
- the difference (TrL-TrS) of the colorant contained in the colored layer is not particularly limited, but is preferably 5% or more, more preferably 20% or more, still more preferably 50% or more, and preferably 99.9%. Below, more preferably 99.5% or less, still more preferably 99% or less.
- the average value TrL of the colorant contained in the colored layer is not particularly limited, but is preferably 10% or more, more preferably 30% or more, still more preferably 70% or more, and preferably 99.9% or less. More preferably 99.5% or less, still more preferably 99% or less.
- the resin film may contain any layer in addition to the colored layer.
- optional layers include a resin layer, which is a layer made of a resin material.
- the resin material forming the resin layer examples include materials similar to the materials exemplified as the resin material contained in the colored layer.
- the resin material forming the resin layer which is an arbitrary layer, may be the same as or different from the resin material contained in the colored layer.
- the resin material forming the resin layer is the same as the resin material contained in the colored layer.
- the resin layer that the resin film may contain may contain the colorant described above or may not contain a colorant, but preferably the resin layer does not contain a colorant.
- the weight ratio of the colorant contained in the resin layer is preferably 0.01% by weight or less, more preferably 0.005% by weight or less, and still more preferably 0% by weight, with the total of all materials forming the resin layer being 100% by weight. 001% by weight or less, usually 0% by weight or more, and may be 0% by weight. When the weight ratio of the coloring agent in the resin layer is equal to or less than the above upper limit, bleeding out of the coloring agent from the colored layer and the resin layer that may be contained in the resin film can be reduced.
- the resin film may contain a plurality of resin layers as optional layers.
- the resin film may include, as optional layers, a first resin layer and a second resin layer.
- FIG. 2 is a cross-sectional view schematically showing a self-luminous display according to another embodiment of the invention.
- Self-luminous display 200 includes resin film 220 and self-luminous panel 110 .
- the self-luminous panel 110 has the same configuration as the self-luminous panel 110 included in the self-luminous display 100, so the description thereof will be omitted.
- the resin film 220 is arranged on the viewing side of the self-luminous panel 110, that is, on the image display surface 110U side.
- resin film 220 is provided on image display surface 110U of self-luminous panel 110 .
- the resin film 220 is directly attached to the self-luminous panel 110, but in another embodiment, an adhesive layer (pressure-sensitive adhesive layer) or the like is provided between the resin film 220 and the self-luminous panel 110.
- Other layers may be arranged.
- the resin film 220 includes a first resin layer 222a, a colored layer 221, and a second resin layer 222b in this order.
- the colored layer 221 is arranged between the first resin layer 222a and the second resin layer 222b.
- a first resin layer 222a is provided directly on one main surface 221D of the colored layer 221 .
- a second resin layer 222 b is provided directly on the other main surface 221 U of the colored layer 221 .
- Resin film 220 is arranged such that first resin layer 222 a is in contact with image display surface 110 U of self-luminous panel 110 .
- the first resin layer and the second resin layer may be made of the same resin material, or may be made of different resin materials. From the viewpoint of simplifying the manufacturing equipment, the first resin layer and the second resin layer are preferably made of the same resin material.
- the first resin layer and the second resin layer may have the same thickness, or may have different thicknesses.
- the ratio of the thickness of the first resin layer to the thickness of the second resin layer is preferably 3/1 to 1/ 3, more preferably 2/1 to 1/2.
- the average value AvS of linear transmittance at wavelengths of 480 nm to 610 nm is smaller than the average value AvL of linear transmittances at wavelengths of 700 nm to 800 nm. That is, the difference (AvL-AvS) (%) between the average value AvL and the average value AvS is greater than zero.
- the linear transmittance of the resin film can be measured using a spectrophotometer.
- the linear transmittance of the resin film is measured every 1 nm in the wavelength range, and the arithmetic average value of the linear transmittances measured every 1 nm can be used.
- the difference (AvL-AvS) between the average value AvL and the average value AvS is not particularly limited, but is preferably 5% or more, more preferably 10% or more, still more preferably 15% or more, preferably 70% or less, More preferably 65% or less, still more preferably 60% or less.
- the difference (AvL-AvS) is within the above range, when various optical sensors such as an infrared sensor are combined with the self-luminous display, the detection function of the light sensor is not greatly affected. Reflection can be reduced. Also, the color tone of the self-luminous display can be adjusted.
- the average value AvL is not particularly limited, but is preferably 60% or more, more preferably 70% or more, still more preferably 75% or more, preferably 99% or less, more preferably 95% or less, and still more preferably 94%. It is below. Since the average value AvL is within the above range, when various optical sensors such as an infrared sensor are combined with the self-luminous display, the reflectance of the self-luminous display can be reduced without significantly affecting the detection function of the light sensor. and the effect of brightness maintenance can be highly balanced. Moreover, the transparency in the visible light wavelength range can be maintained.
- the resin film according to the present embodiment preferably has a linear transmittance at a wavelength of 550 nm of 35% or more, more preferably 37% or more, still more preferably 40% or more, preferably 75% or less, more preferably 73% or more. % or less, more preferably 70% or less.
- the linear transmittance at 550 nm of the resin film is within the above range, the effect of reducing the reflectance of the self-luminous display and the effect of maintaining the luminance of the self-luminous display can be highly balanced.
- the in-plane retardation Re of the resin film is preferably 1000 nm or less, more preferably 800 nm or less, still more preferably 500 nm or less, usually 0 nm or more, and may be 5 nm or more.
- the resin film may have an in-plane retardation Re that functions as a ⁇ /4 plate.
- the in-plane retardation Re of the resin film is preferably 100 nm or more, more preferably 102 nm or more, still more preferably 105 nm or more, preferably 160 nm or less, more preferably 158 nm or less, still more preferably 155 nm. It is below. Since the resin film has an in-plane retardation Re that functions as a ⁇ / 4 plate, a linear polarizer can be further combined with the resin film to form a circularly polarizing plate, and the color of the self-luminous display can be adjusted. sell.
- the haze of the resin film is not particularly limited, it is preferably 1% or less, more preferably 0.3% or less, and usually 0.01% or more from the viewpoint of high definition display of the self-luminous display. be. Haze can be measured with a haze meter.
- the thickness of the resin film can be arbitrarily set according to the content ratio of the coloring agent in the colored layer.
- the thickness of the resin film may be, for example, 10 ⁇ m or more, such as 30 ⁇ m or more, and may be, for example, 300 ⁇ m or less, such as 150 ⁇ m or less.
- the ratio of the thickness of the colored layer to the thickness of the resin film is preferably 10% or more, more preferably 25% or more, and is usually 100% or less, and is 100% when the resin film does not contain any layer. Yes, and when the resin film includes optional layers, it may be 90% or less, or 75% or less.
- the self-luminous display can have arbitrary components in addition to the self-luminous panel and resin film described above.
- a self-luminous display includes an adhesive layer (including a pressure-sensitive adhesive layer) that bonds a self-luminous panel and a resin film; a polarizer; a protective film; a hard coat layer; good too.
- the reflectance of the self-luminous display of this embodiment is reduced to the extent that it can be used indoors. Specifically, the reflectance of the self-luminous display is, for example, 8% or less, for example, 6% or less, and usually 0% or more. With reflectance in this range, self-luminous displays typically have sufficient contrast for indoor use.
- Resin film for self-luminous display The resin film contained in the self-luminous display is suitable for reducing the reflectance of the self-luminous display. Therefore, the above resin film is useful as a resin film for a self-luminous display.
- the resin film included in the self-luminous display can be manufactured by any manufacturing method.
- a resin film can be produced, for example, by a production method including the following steps (1) and (2).
- Step (1) kneading raw materials containing a resin material and a coloring agent to obtain a colored resin material.
- Step (2) Extruding the colored resin material to form an extruded film.
- step (1) raw materials containing a resin material and a coloring agent are kneaded to obtain a colored resin material.
- the resin material contained in the raw material the resin material contained in the colored layer of the resin film is used.
- the coloring agent contained in the raw material the coloring agent contained in the colored layer of the resin film is used.
- a coloring agent having a smaller average transmittance TrS at a wavelength of 480 nm or more and 610 nm or less than an average transmittance TrL at a wavelength of 700 nm or more and 800 nm or less can be preferably used.
- the form of the resin material and the form of the colorant in the raw material for obtaining the colored resin material are not particularly limited.
- a mixture in which pellets as a masterbatch containing a high concentration and pellets of a resin material are mixed may be used as a raw material.
- the weight ratio of the colorant in the raw material can be set according to the weight ratio of the colorant in the desired colored layer, and may be the same as the weight ratio of the colorant in the desired colored layer.
- the raw materials are usually kneaded at a temperature above the glass transition temperature Tg of the resin material and below a temperature at which the coloring agent and resin material are not altered.
- the kneading of the raw materials may be performed at, for example, 150° C. or higher, such as 200° C. or higher, and may be performed, for example, at 500° C. or lower, for example, 400° C. or lower.
- the kneading of the raw materials can be performed with any kneading device such as a small kneader or a single-screw extruder.
- the colored resin material obtained by kneading the raw materials may be used directly in step (2) without being processed, and the colored resin material obtained by kneading the raw materials is processed into a shape such as pellets that is easy to handle. and then used in step (2).
- step (2) the colored resin material is extruded to form an extruded film.
- Formation of an extruded film is usually carried out by extruding a molten colored resin material into a film.
- the colored resin material extruded in the form of a film is cooled by being cast on cooling rolls or the like to produce an extruded film.
- the obtained extruded film may be used as a resin film as it is, or may be used as a resin film after being further subjected to an arbitrary process.
- a long extruded film can be obtained by continuously extruding the colored resin material.
- the colored resin material and the material of the optional layer may be co-extruded in step (2).
- a multi-layer extruded film containing the colored layer, which is a layer of the colored resin material, and optional layers can be formed.
- Co-extrusion can be carried out, for example, by supplying a colored resin material and another material for forming an arbitrary layer to a co-extrusion device equipped with a multi-layering member such as a multi-layer die or a multi-layer feed block.
- a co-extrusion device equipped with a multi-layering member such as a multi-layer die or a multi-layer feed block.
- the method for producing a resin film may include optional steps in addition to the steps (1) and (2).
- optional steps include stretching the extruded film obtained in step (2). By stretching the extruded film, retardation can be imparted to the resin film.
- the stretching conditions arbitrary conditions can be selected according to the desired retardation of the resin film.
- the stretching direction includes the longitudinal direction, the width direction, and the oblique direction.
- the oblique direction means a direction perpendicular to the thickness direction and neither parallel nor perpendicular to the width direction.
- the stretching direction may be one direction or two or more directions.
- the stretching method for example, a method of uniaxially stretching the extruded film in the longitudinal direction (longitudinal uniaxial stretching method), a method of uniaxially stretching the extruded film in the width direction (horizontal uniaxial stretching method), etc., uniaxial stretching method; Biaxial stretching methods such as a simultaneous biaxial stretching method in which the film is stretched in the longitudinal direction and in the width direction at the same time, and a sequential biaxial stretching method in which the extruded film is stretched in one of the longitudinal direction and the width direction and then stretched in the other direction. a method of stretching an extruded film in an oblique direction (diagonal stretching method); and the like.
- the draw ratio may be, for example, 1.05 times to 3 times, for example, 1.2 times to 2.5 times.
- Other optional steps include a step of subjecting the resin film to surface treatment such as corona treatment; and a step of heating the resin film to reduce dimensional changes in the resin film.
- Self-luminous displays can be manufactured by any method.
- a self-luminous display is produced by a method including the steps of preparing a resin film and a self-luminous panel, and bonding the resin film and the self-luminous panel via a layer of an adhesive (including a pressure-sensitive adhesive). can be manufactured.
- the resin film a resin film manufactured by a method including the above steps (1) and (2) and optional steps as necessary may be used.
- Linear transmittance, AvL, AvS Linear transmittance, AvL, AvS
- V570 spectrophotometer
- the linear transmittance (%) at a wavelength of 550 nm was read from the obtained spectrum.
- the arithmetic average value of the linear transmittance measured for each 1 nm in the wavelength range of 480 nm or more and 610 nm or less was obtained and used as the average value AvS (%) of the linear transmittance in the wavelength of 480 nm or more and 610 nm or less.
- the arithmetic average value of the linear transmittance measured for each 1 nm in the wavelength range of 700 nm or more and 800 nm or less was obtained, and the average value AvL (%) of the linear transmittance in the wavelength range of 700 nm or more and 800 nm or less was obtained.
- An arithmetic average value of the transmittance measured for each 1 nm in the wavelength range of 480 nm to 610 nm was obtained and used as the average value TrS (%) of the transmittance in the wavelength range of 480 nm to 610 nm.
- An arithmetic average value of the transmittance measured for each 1 nm in the wavelength range of 700 nm or more and 800 nm or less was obtained and used as the average value TrL (%) of the transmittance in the wavelength range of 700 nm or more and 800 nm or less.
- TrS was 4.7%
- TrL was 94.8%
- the value of (TrL-TrS) was 90.1%.
- Example 1 (1-1. Step of obtaining colored resin material (1))
- This raw material (M) was kneaded with a small kneader "Xplore” (Xplore Instruments) to obtain a colored resin material.
- a self-luminous display was obtained by laminating the extruded film as the resin film onto the image display surface of a commercially available organic light-emitting diode (OLED) panel having a reflectance of 10%.
- the reflectance of the obtained self-luminous display was 4%, the brightness in the black display state (that is, the state in which black was displayed on the screen) was lowered, and the display characteristics were improved in indoor observation.
- Example 2 An extruded film (resin film) was obtained in the same manner as in Example 1, except that the following items were changed. ⁇ In (1-1), change the amount of Zeonor (registered trademark) 1430 pellets to 99.9 parts, and change the amount of coloring agent (PC-5857, manufactured by Orient Chemical Industry Co., Ltd., oil-soluble dye) and 0.1 part. - In (1-2), the extrusion conditions of the film forming machine were adjusted to extrude the colored resin material into a film having a thickness of 69 ⁇ m and a width of 30 mm.
- Zeonor registered trademark
- coloring agent PC-5857
- the in-line transmittance and haze at 550 nm were measured for the finished extruded film (resin film), the in-line transmittance was 74.4% and the haze was 0.1%.
- This extruded film as a resin film was pasted onto the image display surface of a commercially available OLED panel having a reflectance of 10% to obtain a self-luminous display.
- the resulting self-luminous display had a reflectance of 5%, decreased brightness in the black display state, and improved display characteristics when observed indoors.
- Example 3 a multilayer extruded film having a layer structure of (first resin layer)/(colored layer)/(second resin layer) was formed according to the following procedure.
- a film forming apparatus equipped with a multi-manifold die that can form a three-layer film by co-extrusion of two types of resin materials was prepared.
- Zeonor (registered trademark) 1430 pellets were prepared as materials for the first resin layer and the second resin layer. The pellets were fed into a first single-screw extruder equipped with a double-flighted screw and heated to melt.
- a raw material (M) containing a resin material and a colorant (pellets coated with a colorant) was prepared in the same manner as in Example 1 (1-1). This raw material (M) was put into a second single-screw extruder equipped with a double-flighted screw, heated and melted to prepare a colored resin material for forming a colored layer.
- the colored resin material prepared above was passed through a leaf disk-shaped polymer filter with an opening of 10 ⁇ m and supplied to the other manifold.
- a resin material and a colored resin material as materials for the first resin layer and the second resin layer are simultaneously extruded from a multi-manifold die to obtain (first resin layer) / (colored layer) / (second resin layer ), a three-layer film-like molten resin was obtained.
- This film-like molten resin is cast on a cooling roll adjusted to a surface temperature of 130 ° C., and then passed between two cooling rolls adjusted to a surface temperature of 50 ° C. to form a three-layered film made of two materials. An extruded film was obtained.
- This extruded film has a layer structure of (first resin layer (thickness 15 ⁇ m)) / (colored layer (thickness 70 ⁇ m)) / (second resin layer (thickness 10 ⁇ m)), and the overall thickness is It was 95 ⁇ m.
- This extruded film as a resin film was laminated onto the image display surface of a commercially available OLED panel with a reflectance of 10% so that the first resin layer was in contact with it to obtain a self-luminous display.
- the reflectance of the obtained self-luminous display was 2.5%, the brightness in the black display state was lowered, and the display characteristics were improved when observed indoors.
- Example 1 A self-luminous display was obtained in the same manner as in Example 1, except that the following items were changed. - An extruded film as a resin film was pasted onto the image display surface of a commercially available OLED panel having a reflectance of 53%. The reflectance of the obtained self-luminous display was 21%, and the black display state was brighter than those of Examples 1 to 3, and the display was difficult to see when observed indoors.
- Example 2 A self-luminous display was obtained in the same manner as in Example 1, except that the following items were changed. - An extruded film as a resin film was pasted onto the image display surface of a commercially available OLED panel having a reflectance of 45%. The reflectance of the obtained self-luminous display was 18%, and the black display state was brighter than in Examples 1 to 3, and the display was difficult to see when observed indoors.
- Self-luminous display 110U Image display surface 120 Resin film (colored layer) 200 self-luminous display 220 resin film 221 colored layer 221U main surface 221D main surface 222a first resin layer 222b second resin layer
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Abstract
Description
また、近年、表示素子自体が発光することにより、画像表示を実現する、自発光ディスプレイの開発も進んでいる。表示性能を向上させるため、自発光ディスプレイである有機エレクトロルミネッセンスディスプレイ(有機ELディスプレイ)に、位相差板及び偏光子を有する光学積層体を組み込むことが行われている(特許文献2)。
自発光ディスプレイが反射電極などの反射要素を有する場合、自発光ディスプレイに入射した外光が、反射要素により一定の反射率で反射されて、反射光として視認され、自発光ディスプレイのコントラストが低下することがある。したがって、自発光ディスプレイの反射率を低減することが求められる。
すなわち、本発明は、以下を提供する。
前記樹脂フィルムが、樹脂材料と着色剤とを含む着色層を含み、かつ波長480nm以上610nm以下での直線透過率の平均値AvSが、波長700nm以上800nm以下での直線透過率の平均値AvLより小さい、自発光ディスプレイ。
[2」 前記樹脂フィルムが、更に第一の樹脂層と第二の樹脂層とを含み、前記着色層が、前記第一の樹脂層と前記第二の樹脂層との間に配置されている、[1]に記載の自発光ディスプレイ。
[3] 前記樹脂フィルムが、100nm以上160nm以下の面内位相差を有する、[1]又は[2]に記載の自発光ディスプレイ。
[4] 前記樹脂材料が、環状オレフィン系重合体及びその水素化物からなる群より選択される一種以上を含む、[1]~[3]のいずれか一項に記載の自発光ディスプレイ。
[5] 前記着色層が、前記着色剤を0.001重量%以上1重量%以下含む、[1]~[4]のいずれか一項に記載の自発光ディスプレイ。
[6] 前記樹脂フィルムは、波長550nmでの直線透過率が35%以上75%以下である、[1]~[5]のいずれか一項に記載の自発光ディスプレイ。
[7] 樹脂材料と着色剤とを含む原料を混錬して着色樹脂材料を得る工程(1)と、
前記着色樹脂材料を押し出して、押出フィルムを形成する工程(2)と、
を含み、
前記着色剤は、波長480nm以上610nm以下での透過率の平均値TrSが波長700nm以上800nm以下での透過率の平均値TrLより小さい、自発光ディスプレイ用樹脂フィルムの製造方法。
[8] 前記工程(2)における前記着色樹脂材料の押し出しを、他の材料と共に行って、前記着色樹脂材料の層と前記他の材料の層とを含む多層の押出フィルムを形成する、[7]に記載の自発光ディスプレイ用樹脂フィルムの製造方法。
[9] 前記押出フィルムを延伸する工程を含む、[7]又は[8]に記載の自発光ディスプレイ用樹脂フィルムの製造方法。
本発明の一実施形態に係る自発光ディスプレイは、反射率が40%以下である自発光パネルと、前記自発光パネルの視認側に配置される樹脂フィルムとを含む。ここで、前記樹脂フィルムは、樹脂材料と着色剤とを含む着色層を含み、かつ波長480nm以上610nm以下での直線透過率の平均値AvSが、波長700nm以上800nm以下での直線透過率の平均値AvLより小さい。
自発光パネル110は、画像が表示される画像表示面110Uを有し、樹脂フィルム120は、自発光パネル110の視認側、すなわち、画像表示面110Uの側に、配置されている。本実施形態では、樹脂フィルム120は、自発光パネル110の画像表示面110U上に、設けられている。本実施形態では、樹脂フィルム120は、後述する着色層でもある。本実施形態では、樹脂フィルム120は、自発光パネル110に直接しているが、別の実施形態では、樹脂フィルム120と自発光パネル110との間に、接着層(感圧性接着層)などの他の層が配置されていてもよい。
以下、本実施形態の自発光ディスプレイが備える自発光パネル及び樹脂フィルムについて説明する。
自発光パネルは、バックライトのような光源を要さずに、表示素子自体が発光することにより画像表示を行うパネルを意味する。自発光パネルの例としては、マイクロ発光ダイオード表示素子(マイクロLED表示素子)を備えるパネル、有機エレクトロルミネッセンス表示素子(有機EL表示素子)を備えるパネルが挙げられる。
反射率が前記上限値以下である自発光パネルと後述する本実施形態に係る樹脂フィルムとを組み合わせることにより、自発光ディスプレイの反射率を室内で実用可能な程度に低減できる。
本実施形態に係る樹脂フィルムは、樹脂材料と着色剤とを含む着色層を含む。かつ、本実施形態の樹脂フィルムは、波長480nm以上610nm以下での直線透過率の平均値AvSが、波長700nm以上800nm以下での直線透過率の平均値AvLより小さい。
着色層に含まれうる樹脂材料は、特に限定されないが、好ましくは熱可塑性である。樹脂材料は、通常重合体及び必要に応じて任意の成分を含みうる。
樹脂材料に含まれうる重合体の例としては、ノルボルネン系重合体等の、環状オレフィン系重合体及びその水素化物;ポリエチレン、ポリプロピレン等のポリオレフィン;ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル;ポリフェニレンサルファイド等のポリアリーレンサルファイド;ポリビニルアルコール;ポリカーボネート;ポリアリレート;ポリメチルメタクリレート等のアクリル系重合体;セルロースエステル重合体;ポリエーテルスルホン;ポリスルホン;ポリアリールスルホン;ポリ塩化ビニル;棒状液晶ポリマーなどが挙げられる。
任意の成分として、1種類を単独で用いてもよく、2種類以上を任意の比率で組み合わせて用いてもよい。
樹脂材料における重合体以外の任意の成分の合計割合は、好ましくは5重量%以下、より好ましくは3重量%以下、更に好ましくは1重量%以下であり、通常0重量%以上であり、0重量%であってもよい。
着色剤の例としては、可視光域内(480nm~610nm)に、75%以下の透過率を持つ波長域が存在する、顔料及び染料が挙げられる。着色剤として、一種のみを用いてもよく、二種以上を任意の比率で組み合わせて用いてもよい。
・溶媒:着色剤を溶解又は分散可能な溶媒を用いうる。溶媒は混合溶媒であってもよい。溶媒の例としては、トルエン、キシレン、メチルエチルケトン(MEK)、アセトン、エタノール等の有機溶媒;水;これらの混合溶媒が挙げられる。
・セル:光路長10mmの石英セル
・濃度:0.01重量%
まず着色剤を溶媒に溶解又は分散させて、着色剤の濃度が0.01重量%の溶液又は分散液を作製する。分散剤を用いてもよい。この溶液又は分散液を光路長10mmの石英セルに入れたものを測定サンプルとし、分光光度計で透過率を測定する。このとき、使用した溶媒のみを石英セルに入れて測った透過率を100%とする。
樹脂フィルムは、前記の着色層に加えて、任意の層を含みうる。任意の層の例としては、樹脂材料からなる層である、樹脂層が挙げられる。
樹脂層に含まれる着色剤の重量割合は、樹脂層を形成する全材料の合計を100重量%として、好ましくは0.01重量%以下、より好ましくは0.005重量%以下、更に好ましくは0.001重量%以下であり、通常0重量%以上であり、0重量%であってもよい。
樹脂層中の着色剤の重量割合が、前記上限値以下であることにより、樹脂フィルムに含まれうる着色層及び樹脂層から、着色剤がブリードアウトすることを低減しうる。
図2は、本発明の別の実施形態に係る自発光ディスプレイを模式的に示す断面図である。
自発光ディスプレイ200は、樹脂フィルム220と自発光パネル110とを備える。自発光パネル110は、自発光ディスプレイ100が備える自発光パネル110と同様の構成を有しているので、説明を省略する。
本実施形態に係る樹脂フィルムは、前記のとおり波長480nm以上610nm以下での直線透過率の平均値AvSが、波長700nm以上800nm以下での直線透過率の平均値AvLより小さい。すなわち、平均値AvLと平均値AvSとの差(AvL-AvS)(%)は、0より大きい。
樹脂フィルムの直線透過率は、分光光度計を用いて測定しうる。所定の波長範囲での直線透過率の平均値としては、当該波長範囲において、1nmごとに樹脂フィルムの直線透過率を測定し、それら1nmごとに測定された直線透過率の算術平均値を用いうる。
平均値AvLと平均値AvSとの差(AvL-AvS)は、特に限定されないが、好ましくは5%以上、より好ましくは10%以上、更に好ましくは15%以上であり、好ましくは70%以下、より好ましくは65%以下、更に好ましくは60%以下である。差(AvL-AvS)が、前記範囲内であることにより、自発光ディスプレイに赤外線センサーなどの各種光センサーを組み合わせた場合に、光センサーの検出機能に大きな影響を与えずに、自発光ディスプレイの反射を低減しうる。また、自発光ディスプレイの色味を調整しうる。
樹脂フィルムの厚みは、着色層における着色剤の含有割合などに応じて、任意の厚みとしうる。樹脂フィルムの厚みは、例えば10μm以上、例えば30μm以上としてよく、例えば300μm以下、例えば150μm以下としてよい。
自発光ディスプレイは、前記の自発光パネル及び樹脂フィルムに加えて、任意の構成要素を有しうる。例えば、自発光ディスプレイは、自発光パネルと樹脂フィルムとを貼合する接着層(感圧性接着層を含む);偏光子;保護フィルム;ハードコート層;反射防止層;防眩層を含んでいてもよい。
本実施形態の自発光ディスプレイの反射率は、室内で実用可能な程度まで低減されている。自発光ディスプレイの反射率は、具体的には、例えば8%以下であり、例えば6%以下であり、通常0%以上である。この範囲の反射率であれば、通常自発光ディスプレイは、室内で使用するために十分なコントラストを有する。
自発光ディスプレイに含まれる前記の樹脂フィルムは、自発光ディスプレイの反射率を低減するために好適である。したがって、前記の樹脂フィルムは、自発光ディスプレイ用樹脂フィルムとして有用である。
前記の自発光ディスプレイに含まれる樹脂フィルム(自発光ディスプレイ用樹脂フィルム)は、任意の製造方法により製造されうる。樹脂フィルムは、例えば下記の工程(1)及び工程(2)を含む製造方法により製造されうる。
工程(2):前記着色樹脂材料を押し出して、押出フィルムを形成すること。
工程(1)では、樹脂材料と着色剤とを含む原料を混錬して着色樹脂材料を得る。
原料に含まれる樹脂材料としては、樹脂フィルムの着色層に含まれる樹脂材料を用いる。原料に含まれる着色剤としては、樹脂フィルムの着色層に含まれる着色剤を用いる。
着色剤としては、波長480nm以上610nm以下での透過率の平均値TrSが波長700nm以上800nm以下での透過率の平均値TrLより小さい着色剤を好ましく用いうる。
工程(2)では、前記着色樹脂材料を押し出して、押出フィルムを形成する。
着色樹脂材料と任意の層の材料とを共押出することにより、着色樹脂材料の層である着色層と、任意の層とを含む多層の押出フィルムが形成されうる。
樹脂フィルムの製造方法は、前記の工程(1)及び工程(2)に加えて、任意の工程を含みうる。
任意の工程の例としては、工程(2)で得られた押出フィルムを延伸する工程が挙げられる。押出フィルムを延伸することにより、樹脂フィルムに位相差を付与しうる。
延伸方向に制限はなく、例えば、長手方向、幅方向、斜め方向などが挙げられる。ここで、斜め方向とは、厚み方向に対して垂直な方向であって、幅方向に平行でもなく垂直でもない方向を表す。また、延伸方向は、一方向でもよく、二以上の方向でもよい。よって、延伸方法としては、例えば、押出フィルムを長手方向に一軸延伸する方法(縦一軸延伸法)、押出フィルムを幅方向に一軸延伸する方法(横一軸延伸法)等の、一軸延伸法;押出フィルムを長手方向に延伸すると同時に幅方向に延伸する同時二軸延伸法、押出フィルムを長手方向及び幅方向の一方に延伸した後で他方に延伸する逐次二軸延伸法等の、二軸延伸法;押出フィルムを斜め方向に延伸する方法(斜め延伸法);などが挙げられる。
自発光ディスプレイは、任意の方法により製造しうる。例えば、自発光ディスプレイは、樹脂フィルム及び自発光パネルを用意する工程、樹脂フィルムと自発光パネルとを、接着剤(感圧性接着剤を含む)の層を介して貼合する工程を含む方法により製造しうる。
(反射率の測定)
パネルの反射率(%)及び樹脂フィルムが組み込まれたディスプレイの反射率(%)を、分光測色計(CM2600d、コニカミノルタ社製)により測定した。測定光源をD65光源とし、測定光学系を正反射光込み(SCI)として反射率を求めた。
分光光度計(V570、日本分光社製)を使用し、測定波長300nm~800nmの範囲で1nmごとに樹脂フィルムの直線透過率を測定した。
得られたスペクトルから、波長550nmにおける直線透過率(%)を読み取った。
波長480nm以上610nm以下の波長範囲において1nmごとに測定された直線透過率の算術平均値を求め、波長480nm以上610nm以下での直線透過率の平均値AvS(%)とした。
波長700nm以上800nm以下の波長範囲において1nmごとに測定された直線透過率の算術平均値を求め、波長700nm以上800nm以下での直線透過率の平均値AvL(%)とした。
樹脂フィルムのヘイズを、ヘイズメーター(NDH4000、日本電色工業株式会社製)を用いJIS K7361準拠の条件により測定した。
下記実施例及び比較例で用いた着色剤(PC-5857、オリエント化学工業株式会社製、油溶性染料)の波長300nm~800nmにおける透過率を、分光光度計(V570、日本分光社製)を用いて、下記の条件で1nmごとに測定した。このとき、溶媒(トルエン)のみを石英セルに入れて測った透過率を100%とした。
・溶媒:トルエン
・濃度:0.01重量%
・セル:光路長10mmの石英セル
波長700nm以上800nm以下の波長範囲において1nmごとに測定された透過率の算術平均値を求め、波長700nm以上800nm以下での透過率の平均値TrL(%)とした。
(1-1.着色樹脂材料を得る工程(1))
ガラス瓶に樹脂材料として、環状オレフィン系重合体の水素化物を含む樹脂材料(ゼオノア(登録商標)1430、日本ゼオン社製、ガラス転移温度Tg=138℃)のペレットを99.7部、着色剤(PC-5857、オリエント化学工業株式会社製、油溶性染料)を0.3部入れて振とうしてペレットに着色剤をまぶし、樹脂材料及び着色剤を含む原料(M)とした。この原料(M)を、小型混錬機「Xplore」(Xplore Instruments社)で混錬し、着色樹脂材料を得た。
次いで、着色樹脂材料を、フィルム成形機に供給し、厚み31um幅30mmのフィルム状に押し出し、押出フィルムを得た。押出フィルムは、樹脂材料と着色剤とを含む着色層からなる単層構造を有している。出来上がった押出フィルム(樹脂フィルム)について、550nmでの直線透過率及びヘイズを測定したところ、直線透過率は67.7%であり、ヘイズは0.1%であった。また、波長480nm以上610nm以下での直線透過率の平均値AvS及び波長700nm以上800nm以下での直線透過率の平均値AvLは、下表のとおりであった。
下記事項を変更した以外は、実施例1と同様に操作して、押出フィルム(樹脂フィルム)を得た。
・(1-1)において、ゼオノア(登録商標)1430のペレットの量を変更して99.9部とし、着色剤(PC-5857、オリエント化学工業株式会社製、油溶性染料)の量を変更して0.1部とした。
・(1-2)において、フィルム成形機の押出条件を調整して、着色樹脂材料を厚み69um幅30mmのフィルム状に押し出した。
出来上がった押出フィルム(樹脂フィルム)について、550nmでの直線透過率及びヘイズを測定したところ、直線透過率は74.4%であり、ヘイズは0.1%であった。この樹脂フィルムとしての押出フィルムを反射率10%である市販のOLEDパネルの画像表示面上に貼合して自発光ディスプレイを得た。得られた自発光ディスプレイの反射率は5%となり、黒表示状態の明るさが低下して、室内での観察において表示特性が改善した。
実施例3では、(第一の樹脂層)/(着色層)/(第二の樹脂層)の層構成を有する、多層の押出フィルムを以下の手順に従って形成した。
下記事項を変更した以外は実施例1と同様にして、自発光ディスプレイを得た。
・樹脂フィルムとしての押出フィルムを、反射率53%である市販のOLEDパネルの画像表示面上に貼合した。
得られた自発光ディスプレイの反射率は21%となり実施例1~3と比較して黒表示状態が明るく、室内での観察において表示が見えにくかった。
下記事項を変更した以外は実施例1と同様にして、自発光ディスプレイを得た。
・樹脂フィルムとしての押出フィルムを、反射率45%である市販のOLEDパネルの画像表示面上に貼合した。
得られた自発光ディスプレイの反射率は18%となり実施例1~3と比較して黒表示状態が明るく、室内での観察において表示が見えにくかった。
実施例及び比較例で用いた樹脂フィルムの測定結果を下表に示す。
下表において、略号は下記の意味を表す。
「AvS」:波長480nm~610nmでの直線透過率の平均値
「AvL」:波長700nm~800nmでの直線透過率の平均値
反射率が40%以下である自発光パネルと、樹脂フィルムとを含む自発光ディスプレイであって、樹脂フィルムの平均値AvSが、平均値AvLより小さい自発光ディスプレイ(実施例1~3)は、反射率が8%以下であって、室内で実用可能な程度に低減されていることがわかる。
一方、反射率が40%より大きい自発光パネルを含む自発光ディスプレイは、反射率が8%を超え、黒表示状態が明るくなり室内での観察において表示が見えにくくなった。
110 自発光パネル
110U 画像表示面
120 樹脂フィルム(着色層)
200 自発光ディスプレイ
220 樹脂フィルム
221 着色層
221U 主面
221D 主面
222a 第一の樹脂層
222b 第二の樹脂層
Claims (9)
- 反射率が40%以下である自発光パネルと、前記自発光パネルの視認側に配置される樹脂フィルムとを含み、
前記樹脂フィルムが、樹脂材料と着色剤とを含む着色層を含み、かつ波長480nm以上610nm以下での直線透過率の平均値AvSが、波長700nm以上800nm以下での直線透過率の平均値AvLより小さい、自発光ディスプレイ。 - 前記樹脂フィルムが、更に第一の樹脂層と第二の樹脂層とを含み、前記着色層が、前記第一の樹脂層と前記第二の樹脂層との間に配置されている、請求項1に記載の自発光ディスプレイ。
- 前記樹脂フィルムが、100nm以上160nm以下の面内位相差を有する、請求項1又は2に記載の自発光ディスプレイ。
- 前記樹脂材料が、環状オレフィン系重合体及びその水素化物からなる群より選択される一種以上を含む、請求項1~3のいずれか一項に記載の自発光ディスプレイ。
- 前記着色層が、前記着色剤を0.001重量%以上1重量%以下含む、請求項1~4のいずれか一項に記載の自発光ディスプレイ。
- 前記樹脂フィルムは、波長550nmでの直線透過率が35%以上75%以下である、請求項1~5のいずれか一項に記載の自発光ディスプレイ。
- 樹脂材料と着色剤とを含む原料を混錬して着色樹脂材料を得る工程(1)と、
前記着色樹脂材料を押し出して、押出フィルムを形成する工程(2)と、
を含み、
前記着色剤は、波長480nm以上610nm以下での透過率の平均値TrSが波長700nm以上800nm以下での透過率の平均値TrLより小さい、自発光ディスプレイ用樹脂フィルムの製造方法。 - 前記工程(2)における前記着色樹脂材料の押し出しを、他の材料と共に行って、前記着色樹脂材料の層と前記他の材料の層とを含む多層の押出フィルムを形成する、請求項7に記載の自発光ディスプレイ用樹脂フィルムの製造方法。
- 前記押出フィルムを延伸する工程を含む、請求項7又は8に記載の自発光ディスプレイ用樹脂フィルムの製造方法。
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JP2004191450A (ja) * | 2002-12-09 | 2004-07-08 | Sumitomo Chem Co Ltd | 自発光型表示装置 |
JP2015174397A (ja) * | 2014-03-17 | 2015-10-05 | 東レ株式会社 | 積層ポリエステルフィルム |
JP2018523854A (ja) * | 2016-03-08 | 2018-08-23 | エルジー・ケム・リミテッド | ディスプレイ装置 |
JP2019204083A (ja) * | 2018-05-21 | 2019-11-28 | 大日本印刷株式会社 | 光学積層体、表示パネル及び表示装置 |
KR20200091203A (ko) * | 2019-01-22 | 2020-07-30 | 동우 화인켐 주식회사 | 광학 부재, 이의 제조 방법 및 이를 포함하는 플렉서블 디스플레이 장치 |
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JP2004191450A (ja) * | 2002-12-09 | 2004-07-08 | Sumitomo Chem Co Ltd | 自発光型表示装置 |
JP2015174397A (ja) * | 2014-03-17 | 2015-10-05 | 東レ株式会社 | 積層ポリエステルフィルム |
JP2018523854A (ja) * | 2016-03-08 | 2018-08-23 | エルジー・ケム・リミテッド | ディスプレイ装置 |
JP2019204083A (ja) * | 2018-05-21 | 2019-11-28 | 大日本印刷株式会社 | 光学積層体、表示パネル及び表示装置 |
KR20200091203A (ko) * | 2019-01-22 | 2020-07-30 | 동우 화인켐 주식회사 | 광학 부재, 이의 제조 방법 및 이를 포함하는 플렉서블 디스플레이 장치 |
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