US20180156944A1 - Quantum dot polarizer and manufacturing method thereof - Google Patents

Quantum dot polarizer and manufacturing method thereof Download PDF

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Publication number
US20180156944A1
US20180156944A1 US15/866,406 US201815866406A US2018156944A1 US 20180156944 A1 US20180156944 A1 US 20180156944A1 US 201815866406 A US201815866406 A US 201815866406A US 2018156944 A1 US2018156944 A1 US 2018156944A1
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protective layer
quantum dot
quantum dots
layer
polarizer
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Tao Hu
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/51—Methods thereof
    • B01F23/511—Methods thereof characterised by the composition of the liquids or solids
    • B01F3/1214—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/0477—Numerical time values
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/0481—Numerical speed values
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00—Nanotechnology
    • Y10S977/70—Nanostructure
    • Y10S977/773—Nanoparticle, i.e. structure having three dimensions of 100 nm or less
    • Y10S977/774—Exhibiting three-dimensional carrier confinement, e.g. quantum dots

Definitions

  • the present invention relates to the field of display, and in particular to a quantum dot (QD) polarizer and manufacturing method thereof.
  • QD quantum dot
  • QD photoluminescence quantum dots
  • the quantum confinement effect is obvious because of the narrow size ( ⁇ 10 nano).
  • the electrons leap from valence band to conduction band, and emitted in an optical energy to form different colors.
  • different colors can be adjusted. Using the blue light from the light emitting diode (LED) is able to effectively increase the color spectrum of the display.
  • the known mainstream QD backlight technologies are divided into two approaches: one is to package the QD into a glass tube and placed in front of the backlight; and the other is to manufacture the QD into a thin film for insertion between the backlight module and the display panel. Understandably, these technologies require specific facility for manufacturing QD, and thus increase cost.
  • a common polarizer has a layered structure, from top down, comprising: a surface protective film 110 , a first protective layer 120 , a polarization layer 130 , a second protective layer 140 , an adhesive layer 150 , and a peel-off protective film 160 , wherein when attaching the polarizer, the peel-off film 160 is peeled off to expose the adhesive layer 150 . After the polarizer is attached, the surface protective film 110 will be peeled off.
  • the core of the structure of the polarizer is the polarization layer 130 , which usually comprises a polyvinyl alcohol (PVA) layer with iodine molecules able to polarize; and the first protective layer 120 and the second protective layer 140 are transparent cellulose triacetate (TAC) layer, mainly to maintain the polarization molecules in the polarization layer 130 to stay extended to avoid dehydration and to protect from external influence.
  • PVA polyvinyl alcohol
  • TAC transparent cellulose triacetate
  • the layered structure of the polarizer is suitable for adding QD film, such as, China Patent CN102854558 and Korea Patent KR20070107498A, disclosed methods for adding a QD layer, i.e., a quantum bar layer with polarization effect between the protective layer and the polarization layer.
  • these methods require additional QD layer process, which leads to degraded transmittance, higher cost and thicker display devices.
  • the object of the present invention is to provide a quantum dot polarizer, able to improve color spectrum and transmittance of the display, without increase the thickness of the display, suitable for ultra-thin applications.
  • Another object of the present invention is to provide a manufacturing method for quantum dot polarizer, directly doping the quantum dots into the cotton glue for protective layer to manufacture a protective layer with quantum dots, so as to manufacture quantum dot polarizer, to eliminate the preparation of independent quantum dot elements for the backlight module to reduce the cost.
  • the present invention provides a quantum dot polarizer, which comprises a polarization layer, a first protective layer and a second protective layer, disposed respectively on the two sides of the polarization layer, a surface protective film disposed on the first protective layer, an adhesive layer disposed on the second protection layer and a peel-off film disposed on the adhesive layer; wherein the first protective layer or the second protective layer being a complex film comprising quantum dots.
  • the first protective layer is the complex film comprising quantum dots.
  • the second protective layer is the complex film comprising quantum dots.
  • the present invention also provides a manufacturing method for quantum dot polarizer, which comprises: Step 1: preparing a cotton glue for quantum dot protective layer; Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer; wherein the quantum dot polarizer comprising a polarization layer, a first protective layer and a second protective layer, disposed respectively on the two sides of the polarization layer, a surface protective film disposed on the first protective layer, an adhesive layer disposed on the second protection layer and a peel-off film disposed on the adhesive layer; and the first protective layer or the second protective layer being a quantum dots protective layer obtained in Step 2; Step 1 comprising the following steps: Step 11: mixing a material for the protective layer and a solution, slowly stirring at a speed of 10-22 rpm/min for 1-3 hours; Step 12: accelerating stirring speed to 23-38 rpm/min
  • the quantum dots are one or more of the following doped or non-doped quantum dots: ZnS, CdS, ZnO, GaN, GaSe, ZnSe, CdSe, ZnTe, CdTe, PbTe, InP, CdAs.
  • the quantum dots are graphene quantum dots or carbon quantum dots.
  • the material for the protective layer is poly triacetylcellulose with 250-350 degree of polymerization.
  • the solution comprises a primary solution and an auxiliary solution
  • the primary solution is dichloromethane
  • the auxiliary solution is methanol, ethanol, or butanol.
  • the plasticizer is a mixed plasticizer comprising a primary plasticizer and an auxiliary plasticizer, the primary plasticizer is triphenyl phosphate, and the auxiliary plasticizer is one or more of the following: dibutyl phthalate, butoxyethyl phthalate, and octyl phthalate.
  • Step 11 the stirring time is 2 hours; in Step 12, the stirring time is 3 hours; in Step 13, the stirring time is 2 hours; and in Step 14, the stirring time is 1 hour.
  • the present invention also provides a manufacturing method for quantum dot polarizer, which comprises: Step 1: preparing a cotton glue for quantum dot protective layer; Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer; wherein the quantum dot polarizer comprising a polarization layer, a first protective layer and a second protective layer, disposed respectively on the two sides of the polarization layer, a surface protective film disposed on the first protective layer, an adhesive layer disposed on the second protection layer and a peel-off film disposed on the adhesive layer; and the first protective layer or the second protective layer being a quantum dots protective layer obtained in Step 2; Step 1 comprising the following steps: Step 11: mixing a material for the protective layer and a solution, slowly stirring at a speed of 10-22 rpm/min for 1-3 hours; Step 12: accelerating stirring speed to 23-38 rpm/min
  • the present invention provides a quantum dot polarizer and manufacturing method thereof.
  • the quantum dot polarizer comprises a first protective layer and a second protective layer, and the first protective layer or the second protective layer being a complex film comprising quantum dots.
  • the invention can improve color spectrum and transmittance, and is applicable to ultra-thin display devices at low cost.
  • the manufacturing method adds the quantum dots to the cotton glue for forming protective layers by extension or coating process to obtain quantum dot protective layer used for quantum dot polarizer.
  • the invention can avoid humidity and oxygen affecting the quantum dots and reduce cost by eliminating manufacturing independent quantum dot element separately.
  • FIG. 1 is a schematic view showing the structure for a known polarizer
  • FIG. 2 is a schematic view showing the structure of the first embodiment of a quantum dot polarizer provided by an embodiment of the present invention.
  • FIG. 3 is a schematic view showing the structure of the second embodiment of a quantum dot polarizer provided by an embodiment of the present invention.
  • the present invention provides a quantum dot polarizer, which comprises: a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; wherein the first protective layer 12 or the second protective layer 14 being a complex film comprising quantum dots 121 .
  • the quantum dot polarizer when used for a liquid crystal display (LCD) panel, to prevent quantum dots from changing the linear polarization state, the first protective layer 12 or the second protective layer 14 comprising quantum dots 121 must be disposed at the side away from the backlight module of the LCD panel.
  • LCD liquid crystal display
  • the quantum dot polarizer is used as the upper polarizer in the LCD panel, and the first protective layer 12 is the complex film comprising quantum dots 121 .
  • the quantum dot polarizer comprises, from top to bottom, the surface protective film 11 , the first protective layer 12 , the polarization layer 13 , the second protective layer 14 , the adhesive layer 15 and the peel-off protective film 16 .
  • the quantum dot polarizer is used as the lower polarizer in the LCD panel, and the second protective layer 14 is the complex film comprising quantum dots 121 .
  • the quantum dot polarizer comprises, from top to bottom, the surface protective film 11 , the first protective layer 12 , the polarization layer 13 , the second protective layer 14 , the adhesive layer 15 and the peel-off protective film 16 .
  • the quantum dot polarizer of the present invention comprises a first protective layer and a second protective layer, and the first protective layer or the second protective layer being a complex film comprising quantum dots.
  • the invention can improve color spectrum and transmittance, and is applicable to ultra-thin display devices at low cost.
  • the present invention also provides a manufacturing method for quantum dot polarizer, which comprises:
  • Step 1 preparing a cotton glue for quantum dot protective layer
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Step 1 comprises the following steps:
  • Step 11 mixing a material for the protective layer and a solution, slowly stirring at a speed of 10-22 rpm/min for 1-3 hours;
  • Step 12 accelerating stirring speed to 23-38 rpm/min for 2-3.5 hours;
  • Step 13 accelerating stirring speed to 40-60 rpm/min for 1.5-2.5 hours.
  • Step 14 slowing down stirring speed to 10-22 rpm/min for 0.5-2 hours.
  • Step 1 further comprises: adding plasticizer in any one of the above Steps 11-14 to obtain a protective layer solution with better solubility; and adding quantum dots in any one of the above Steps 11-14.
  • the material for the protective layer is poly triacetylcellulose with 250-350 degree of polymerization; in Step 11, the solution comprises a primary solution and an auxiliary solution, the primary solution is dichloromethane, and the auxiliary solution is methanol, ethanol, or butanol.
  • the quantum dots are one or more of the following doped or non-doped quantum dots: ZnS, CdS, ZnO, GaN, GaSe, ZnSe, CdSe, ZnTe, CdTe, PbTe, InP, CdAs; or, the quantum dots are graphene quantum dots or carbon quantum dots;
  • the plasticizer is a mixed plasticizer comprising a primary plasticizer and an auxiliary plasticizer, the primary plasticizer is triphenyl phosphate, and the auxiliary plasticizer is one or more of the following: dibutyl phthalate, butoxyethyl phthalate, and octyl phthalate.
  • Step 1 preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11 mixing the protective layer material TAC and a solution, slowly stirring at a speed of 10 rpm/min for 3 hours;
  • Step 12 accelerating stirring speed to 23 rpm/min, adding plasticizer, stirring for 3.5 hours;
  • Step 13 accelerating stirring speed to 40 rpm/min for 2.5 hours.
  • Step 14 slowing down stirring speed to 10 rpm/min, adding quantum dots, stirring for 2 hours to obtain the cotton glue with quantum dots;
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Step 1 preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11 mixing the protective layer material TAC and a solution, slowly stirring at a speed of 22 rpm/min for 1 hour;
  • Step 12 accelerating stirring speed to 38 rpm/min, adding plasticizer, stirring for 2 hours;
  • Step 13 accelerating stirring speed to 60 rpm/min for 1.5 hours.
  • Step 14 slowing down stirring speed to 22 rpm/min, adding quantum dots, stirring for 0.5 hour to obtain the cotton glue with quantum dots;
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Step 1 preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11 mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12 accelerating stirring speed to 30 rpm/min, adding plasticizer, stirring for 3 hours;
  • Step 13 accelerating stirring speed to 50 rpm/min for 2 hours.
  • Step 14 slowing down stirring speed to 20 rpm/min, adding quantum dots, stirring for 1 hour to obtain the cotton glue with quantum dots;
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Step 1 preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11 mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12 accelerating stirring speed to 30 rpm/min for 3 hours;
  • Step 13 accelerating stirring speed to 50 rpm/min, adding plasticizer, stirring for 2 hours;
  • Step 14 slowing down stirring speed to 210 rpm/min, adding quantum dots, stirring for 1 hour to obtain the cotton glue with quantum dots;
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Step 1 preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11 mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12 accelerating stirring speed to 30 rpm/min for 3 hours;
  • Step 13 accelerating stirring speed to 50 rpm/min, adding plasticizer and quantum dots, stirring for 2.5 hours;
  • Step 14 slowing down stirring speed to 10 rpm/min for 2 hours to obtain the cotton glue with quantum dots
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Step 1 preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11 mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12 accelerating stirring speed to 30 rpm/min, adding plasticizer, stirring for 3 hours;
  • Step 13 accelerating stirring speed to 50 rpm/min, adding quantum dots, stirring for 2 hours;
  • Step 14 slowing down stirring speed to 20 rpm/min for 1 hour to obtain the cotton glue with quantum dots
  • Step 2 forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process;
  • Step 3 using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • the quantum dot polarizer comprises a polarization layer 13 , a first protective layer 12 and a second protective layer 14 , disposed respectively on the two sides of the polarization layer 13 , a surface protective film 11 disposed on the first protective layer 12 , an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15 ; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • the present invention provides a quantum dot polarizer and manufacturing method thereof.
  • the quantum dot polarizer comprises a first protective layer and a second protective layer, and the first protective layer or the second protective layer being a complex film comprising quantum dots.
  • the manufacturing method adds the quantum dots to the cotton glue for forming protective layers by extension or coating process to obtain quantum dot protective layer used for quantum dot polarizer.
  • the invention can avoid humidity and oxygen affecting the quantum dots and reduce cost by eliminating manufacturing independent quantum dot element separately.

Abstract

A quantum dot polarizer includes a polarization layer and a first protective layer and a second protective layer respectively arranged on two opposite sides of the polarization layer. One of the first and second protective layers includes a complex film containing quantum dots distributed therein. A surface protective film is arranged on the first protective layer. An adhesive layer is arranged on the second protection layer. A peel-off film is arranged on the adhesive layer.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This is a divisional application of co-pending U.S. patent application Ser. No. 14/908,130, filed on Jan. 28, 2016, which is a national stage of PCT Application No. PCT/CN2015/098143, filed on Dec. 21, 2015, claiming foreign priority of Chinese Patent Application No. 201510618855.5, filed on Sep. 24, 2015.
    • BACKGROUND OF THE INVENTION 1. Field of the Invention
  • The present invention relates to the field of display, and in particular to a quantum dot (QD) polarizer and manufacturing method thereof.
    • 2. The Related Arts
  • To meet the demands on the display for wide spectrum and color saturation, an effective option for major display manufacturers is to add photoluminescence quantum dots (QD) in the backlight structure.
  • In use of QD as a nano-scale material, the quantum confinement effect is obvious because of the narrow size (<10 nano). When excited by light, and the excitation energy level exceeds the band gap, the electrons leap from valence band to conduction band, and emitted in an optical energy to form different colors. Also, by controlling the size of QD, different colors can be adjusted. Using the blue light from the light emitting diode (LED) is able to effectively increase the color spectrum of the display.
  • The known mainstream QD backlight technologies are divided into two approaches: one is to package the QD into a glass tube and placed in front of the backlight; and the other is to manufacture the QD into a thin film for insertion between the backlight module and the display panel. Understandably, these technologies require specific facility for manufacturing QD, and thus increase cost.
  • As shown in FIG. 1, a common polarizer has a layered structure, from top down, comprising: a surface protective film 110, a first protective layer 120, a polarization layer 130, a second protective layer 140, an adhesive layer 150, and a peel-off protective film 160, wherein when attaching the polarizer, the peel-off film 160 is peeled off to expose the adhesive layer 150. After the polarizer is attached, the surface protective film 110 will be peeled off. The core of the structure of the polarizer is the polarization layer 130, which usually comprises a polyvinyl alcohol (PVA) layer with iodine molecules able to polarize; and the first protective layer 120 and the second protective layer 140 are transparent cellulose triacetate (TAC) layer, mainly to maintain the polarization molecules in the polarization layer 130 to stay extended to avoid dehydration and to protect from external influence.
  • Therefore, the layered structure of the polarizer is suitable for adding QD film, such as, China Patent CN102854558 and Korea Patent KR20070107498A, disclosed methods for adding a QD layer, i.e., a quantum bar layer with polarization effect between the protective layer and the polarization layer. However, these methods require additional QD layer process, which leads to degraded transmittance, higher cost and thicker display devices.
    • SUMMARY OF THE INVENTION
  • The object of the present invention is to provide a quantum dot polarizer, able to improve color spectrum and transmittance of the display, without increase the thickness of the display, suitable for ultra-thin applications.
  • Another object of the present invention is to provide a manufacturing method for quantum dot polarizer, directly doping the quantum dots into the cotton glue for protective layer to manufacture a protective layer with quantum dots, so as to manufacture quantum dot polarizer, to eliminate the preparation of independent quantum dot elements for the backlight module to reduce the cost.
  • To achieve the above object, the present invention provides a quantum dot polarizer, which comprises a polarization layer, a first protective layer and a second protective layer, disposed respectively on the two sides of the polarization layer, a surface protective film disposed on the first protective layer, an adhesive layer disposed on the second protection layer and a peel-off film disposed on the adhesive layer; wherein the first protective layer or the second protective layer being a complex film comprising quantum dots.
  • When the quantum dot polarizer is used as an upper polarizer for an LCD panel, the first protective layer is the complex film comprising quantum dots.
  • When the quantum dot polarizer is used as a lower polarizer for an LCD panel, the second protective layer is the complex film comprising quantum dots.
  • The present invention also provides a manufacturing method for quantum dot polarizer, which comprises: Step 1: preparing a cotton glue for quantum dot protective layer; Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer; wherein the quantum dot polarizer comprising a polarization layer, a first protective layer and a second protective layer, disposed respectively on the two sides of the polarization layer, a surface protective film disposed on the first protective layer, an adhesive layer disposed on the second protection layer and a peel-off film disposed on the adhesive layer; and the first protective layer or the second protective layer being a quantum dots protective layer obtained in Step 2; Step 1 comprising the following steps: Step 11: mixing a material for the protective layer and a solution, slowly stirring at a speed of 10-22 rpm/min for 1-3 hours; Step 12: accelerating stirring speed to 23-38 rpm/min for 2-3.5 hours; Step 13: accelerating stirring speed to 40-60 rpm/min for 1.5-2.5 hours; Step 14: slowing down stirring speed to 10-22 rpm/min for 0.5-2 hours; Step 1 further comprising: adding plasticizer in any one of the above Steps 11-14 to obtain a protective layer solution with better solubility; and adding quantum dots in any one of the above Steps 11-14.
  • The quantum dots are one or more of the following doped or non-doped quantum dots: ZnS, CdS, ZnO, GaN, GaSe, ZnSe, CdSe, ZnTe, CdTe, PbTe, InP, CdAs.
  • The quantum dots are graphene quantum dots or carbon quantum dots.
  • In Step 11, the material for the protective layer is poly triacetylcellulose with 250-350 degree of polymerization.
  • In Step 11, the solution comprises a primary solution and an auxiliary solution, the primary solution is dichloromethane, and the auxiliary solution is methanol, ethanol, or butanol.
  • The plasticizer is a mixed plasticizer comprising a primary plasticizer and an auxiliary plasticizer, the primary plasticizer is triphenyl phosphate, and the auxiliary plasticizer is one or more of the following: dibutyl phthalate, butoxyethyl phthalate, and octyl phthalate.
  • In Step 11, the stirring time is 2 hours; in Step 12, the stirring time is 3 hours; in Step 13, the stirring time is 2 hours; and in Step 14, the stirring time is 1 hour.
  • The present invention also provides a manufacturing method for quantum dot polarizer, which comprises: Step 1: preparing a cotton glue for quantum dot protective layer; Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer; wherein the quantum dot polarizer comprising a polarization layer, a first protective layer and a second protective layer, disposed respectively on the two sides of the polarization layer, a surface protective film disposed on the first protective layer, an adhesive layer disposed on the second protection layer and a peel-off film disposed on the adhesive layer; and the first protective layer or the second protective layer being a quantum dots protective layer obtained in Step 2; Step 1 comprising the following steps: Step 11: mixing a material for the protective layer and a solution, slowly stirring at a speed of 10-22 rpm/min for 1-3 hours; Step 12: accelerating stirring speed to 23-38 rpm/min for 2-3.5 hours; Step 13: accelerating stirring speed to 40-60 rpm/min for 1.5-2.5 hours; Step 14: slowing down stirring speed to 10-22 rpm/min for 0.5-2 hours; Step 1 further comprising: adding plasticizer in any one of the above Steps 11-14 to obtain a protective layer solution with better solubility; and adding quantum dots in any one of the above Steps 11-14; in Step 11, the material for the protective layer is poly triacetylcellulose with 250-350 degree of polymerization; in Step 11, the solution comprises a primary solution and an auxiliary solution, the primary solution is dichloromethane, and the auxiliary solution is methanol, ethanol, or butanol; the plasticizer is a mixed plasticizer comprising a primary plasticizer and an auxiliary plasticizer, the primary plasticizer is triphenyl phosphate, and the auxiliary plasticizer is one or more of the following: dibutyl phthalate, butoxyethyl phthalate, and octyl phthalate.
  • Compared to the known techniques, the present invention provides the following advantages: the present invention provides a quantum dot polarizer and manufacturing method thereof. The quantum dot polarizer comprises a first protective layer and a second protective layer, and the first protective layer or the second protective layer being a complex film comprising quantum dots. As such, without increasing the thickness of display, the invention can improve color spectrum and transmittance, and is applicable to ultra-thin display devices at low cost. The manufacturing method adds the quantum dots to the cotton glue for forming protective layers by extension or coating process to obtain quantum dot protective layer used for quantum dot polarizer. As such, the invention can avoid humidity and oxygen affecting the quantum dots and reduce cost by eliminating manufacturing independent quantum dot element separately.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • To make the technical solution of the embodiments according to the present invention, a brief description of the drawings that are necessary for the illustration of the embodiments will be given as follows. Apparently, the drawings described below show only example embodiments of the present invention and for those having ordinary skills in the art, other drawings may be easily obtained from these drawings without paying any creative effort. In the drawings:
  • FIG. 1 is a schematic view showing the structure for a known polarizer;
  • FIG. 2 is a schematic view showing the structure of the first embodiment of a quantum dot polarizer provided by an embodiment of the present invention; and
  • FIG. 3 is a schematic view showing the structure of the second embodiment of a quantum dot polarizer provided by an embodiment of the present invention.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • To further explain the technical means and effect of the present invention, the following refers to embodiments and drawings for detailed description.
  • Referring to FIGS. 2-3, the present invention provides a quantum dot polarizer, which comprises: a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; wherein the first protective layer 12 or the second protective layer 14 being a complex film comprising quantum dots 121.
  • Specifically, when the quantum dot polarizer is used for a liquid crystal display (LCD) panel, to prevent quantum dots from changing the linear polarization state, the first protective layer 12 or the second protective layer 14 comprising quantum dots 121 must be disposed at the side away from the backlight module of the LCD panel.
  • As shown in FIG. 2, in the first embodiment of the present invention, the quantum dot polarizer is used as the upper polarizer in the LCD panel, and the first protective layer 12 is the complex film comprising quantum dots 121. The quantum dot polarizer comprises, from top to bottom, the surface protective film 11, the first protective layer 12, the polarization layer 13, the second protective layer 14, the adhesive layer 15 and the peel-off protective film 16.
  • As shown in FIG. 3, in the second embodiment of the present invention, the quantum dot polarizer is used as the lower polarizer in the LCD panel, and the second protective layer 14 is the complex film comprising quantum dots 121. The quantum dot polarizer comprises, from top to bottom, the surface protective film 11, the first protective layer 12, the polarization layer 13, the second protective layer 14, the adhesive layer 15 and the peel-off protective film 16.
  • The quantum dot polarizer of the present invention comprises a first protective layer and a second protective layer, and the first protective layer or the second protective layer being a complex film comprising quantum dots. As such, without increasing the thickness of display, the invention can improve color spectrum and transmittance, and is applicable to ultra-thin display devices at low cost.
  • The present invention also provides a manufacturing method for quantum dot polarizer, which comprises:
  • Step 1: preparing a cotton glue for quantum dot protective layer;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer;
  • Wherein the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • Specifically, Step 1 comprises the following steps:
  • Step 11: mixing a material for the protective layer and a solution, slowly stirring at a speed of 10-22 rpm/min for 1-3 hours;
  • Step 12: accelerating stirring speed to 23-38 rpm/min for 2-3.5 hours;
  • Step 13: accelerating stirring speed to 40-60 rpm/min for 1.5-2.5 hours; and
  • Step 14: slowing down stirring speed to 10-22 rpm/min for 0.5-2 hours.
  • Step 1 further comprises: adding plasticizer in any one of the above Steps 11-14 to obtain a protective layer solution with better solubility; and adding quantum dots in any one of the above Steps 11-14.
  • Specifically, in Step 11, the material for the protective layer is poly triacetylcellulose with 250-350 degree of polymerization; in Step 11, the solution comprises a primary solution and an auxiliary solution, the primary solution is dichloromethane, and the auxiliary solution is methanol, ethanol, or butanol.
  • Specifically, the quantum dots are one or more of the following doped or non-doped quantum dots: ZnS, CdS, ZnO, GaN, GaSe, ZnSe, CdSe, ZnTe, CdTe, PbTe, InP, CdAs; or, the quantum dots are graphene quantum dots or carbon quantum dots; the plasticizer is a mixed plasticizer comprising a primary plasticizer and an auxiliary plasticizer, the primary plasticizer is triphenyl phosphate, and the auxiliary plasticizer is one or more of the following: dibutyl phthalate, butoxyethyl phthalate, and octyl phthalate.
  • The following is a preferred embodiment of the manufacturing method for quantum dot polarizer of the present invention.
    • Embodiment 1
  • Step 1: preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11: mixing the protective layer material TAC and a solution, slowly stirring at a speed of 10 rpm/min for 3 hours;
  • Step 12: accelerating stirring speed to 23 rpm/min, adding plasticizer, stirring for 3.5 hours;
  • Step 13: accelerating stirring speed to 40 rpm/min for 2.5 hours; and
  • Step 14: slowing down stirring speed to 10 rpm/min, adding quantum dots, stirring for 2 hours to obtain the cotton glue with quantum dots;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • Specifically, the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
    • Embodiment 2
  • Step 1: preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11: mixing the protective layer material TAC and a solution, slowly stirring at a speed of 22 rpm/min for 1 hour;
  • Step 12: accelerating stirring speed to 38 rpm/min, adding plasticizer, stirring for 2 hours;
  • Step 13: accelerating stirring speed to 60 rpm/min for 1.5 hours; and
  • Step 14: slowing down stirring speed to 22 rpm/min, adding quantum dots, stirring for 0.5 hour to obtain the cotton glue with quantum dots;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer;
  • Specifically, the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
    • Embodiment 3
  • Step 1: preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11: mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12: accelerating stirring speed to 30 rpm/min, adding plasticizer, stirring for 3 hours;
  • Step 13: accelerating stirring speed to 50 rpm/min for 2 hours; and
  • Step 14: slowing down stirring speed to 20 rpm/min, adding quantum dots, stirring for 1 hour to obtain the cotton glue with quantum dots;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • Specifically, the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
    • Embodiment 4
  • Step 1: preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11: mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12: accelerating stirring speed to 30 rpm/min for 3 hours;
  • Step 13: accelerating stirring speed to 50 rpm/min, adding plasticizer, stirring for 2 hours; and
  • Step 14: slowing down stirring speed to 210 rpm/min, adding quantum dots, stirring for 1 hour to obtain the cotton glue with quantum dots;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer;
  • Specifically, the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
    • Embodiment 5
  • Step 1: preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11: mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12: accelerating stirring speed to 30 rpm/min for 3 hours;
  • Step 13: accelerating stirring speed to 50 rpm/min, adding plasticizer and quantum dots, stirring for 2.5 hours; and
  • Step 14: slowing down stirring speed to 10 rpm/min for 2 hours to obtain the cotton glue with quantum dots;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • Specifically, the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
    • Embodiment 6
  • Step 1: preparing a cotton glue for quantum dot protective layer; specifically, Step 1 comprising:
  • Step 11: mixing the protective layer material TAC and a solution, slowly stirring at a speed of 15 rpm/min for 2 hours;
  • Step 12: accelerating stirring speed to 30 rpm/min, adding plasticizer, stirring for 3 hours;
  • Step 13: accelerating stirring speed to 50 rpm/min, adding quantum dots, stirring for 2 hours; and
  • Step 14: slowing down stirring speed to 20 rpm/min for 1 hour to obtain the cotton glue with quantum dots;
  • Step 2: forming a complex film comprising quantum dots with the cotton glue to obtain a quantum dot protective layer through an extension process or a coating process; and
  • Step 3: using the quantum dot protective layer to manufacture the quantum dot polarizer.
  • Specifically, the quantum dot polarizer comprises a polarization layer 13, a first protective layer 12 and a second protective layer 14, disposed respectively on the two sides of the polarization layer 13, a surface protective film 11 disposed on the first protective layer 12, an adhesive layer 15 disposed on the second protection layer 14 and a peel-off film 16 disposed on the adhesive layer 15; and the first protective layer 12 or the second protective layer 14 is a quantum dots protective layer obtained in Step 2.
  • In summary, the present invention provides a quantum dot polarizer and manufacturing method thereof. The quantum dot polarizer comprises a first protective layer and a second protective layer, and the first protective layer or the second protective layer being a complex film comprising quantum dots. As such, without increasing the thickness of display, the invention can improve color spectrum and transmittance, and is applicable to ultra-thin display devices at low cost. The manufacturing method adds the quantum dots to the cotton glue for forming protective layers by extension or coating process to obtain quantum dot protective layer used for quantum dot polarizer. As such, the invention can avoid humidity and oxygen affecting the quantum dots and reduce cost by eliminating manufacturing independent quantum dot element separately.
  • It should be noted that in the present disclosure the terms, such as, first, second are only for distinguishing an entity or operation from another entity or operation, and does not imply any specific relation or order between the entities or operations. Also, the terms “comprises”, “include”, and other similar variations, do not exclude the inclusion of other non-listed elements. Without further restrictions, the expression “comprises a . . . ” does not exclude other identical elements from presence besides the listed elements.
  • Embodiments of the present invention have been described, but not intending to impose any unduly constraint to the appended claims. Any modification of equivalent structure or equivalent process made according to the disclosure and drawings of the present invention, or any application thereof, directly or indirectly, to other related fields of technique, is considered encompassed in the scope of protection defined by the claims of the present invention.

Claims (8)

What is claimed is:
1. A quantum dot polarizer, comprising a polarization layer, a first protective layer and a second protective layer that are respectively arranged on two opposite sides of the polarization layer, a surface protective film arranged on the first protective layer, an adhesive layer arranged on the second protection layer, and a peel-off film arranged on the adhesive layer;
wherein one of the first protective layer and the second protective layer comprises a complex film that is formed of a material containing quantum dots distributed therein.
2. The quantum dot polarizer as claimed in claim 1, wherein the quantum dot polarizer is adapted to attach to a liquid crystal display panel to serve as an upper polarizer of the liquid crystal display and the first protective layer comprises the complex film that contains the quantum dots distributed therein.
3. The quantum dot polarizer as claimed in claim 1, wherein the quantum dot polarizer is adapted to attach to a liquid crystal display panel to serve as a lower polarizer of the liquid crystal display and the second protective layer comprises the complex film that contains the quantum dots distributed therein.
4. The quantum dot polarizer as claimed in claim 1, wherein the quantum dots are doped or non-doped quantum dots that are selected from one or more of the following materials: ZnS, CdS, ZnO, GaN, GaSe, ZnSe, CdSe, ZnTe, CdTe, PbTe, InP, CdAs.
5. The quantum dot polarizer as claimed in claim 1, wherein the quantum dots are graphene quantum dots or carbon quantum dots.
6. The quantum dot polarizer as claimed in claim 1, wherein the complex film is formed of poly triacetylcellulose that has a degree of polymerization of 250-350
7. The quantum dot polarizer as claimed in claim 6, wherein the quantum dots are doped or non-doped quantum dots that are selected from one or more of the following materials: ZnS, CdS, ZnO, GaN, GaSe, ZnSe, CdSe, ZnTe, CdTe, PbTe, InP, CdAs.
8. The quantum dot polarizer as claimed in claim 6, wherein the quantum dots are graphene quantum dots or carbon quantum dots.
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US9921343B2 (en) 2018-03-20
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WO2017049785A1 (en) 2017-03-30

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