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EP4133023A1 - Film à boîtes quantiques - Google Patents

Film à boîtes quantiques

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Publication number
EP4133023A1
EP4133023A1 EP20930284.3A EP20930284A EP4133023A1 EP 4133023 A1 EP4133023 A1 EP 4133023A1 EP 20930284 A EP20930284 A EP 20930284A EP 4133023 A1 EP4133023 A1 EP 4133023A1
Authority
EP
European Patent Office
Prior art keywords
quantum dot
microcells
dot film
poly
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20930284.3A
Other languages
German (de)
English (en)
Other versions
EP4133023A4 (fr
Inventor
Chet Steinhagen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
E Ink Corp
Original Assignee
E Ink California LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E Ink California LLC filed Critical E Ink California LLC
Publication of EP4133023A1 publication Critical patent/EP4133023A1/fr
Publication of EP4133023A4 publication Critical patent/EP4133023A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/206—Filters comprising particles embedded in a solid matrix
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • 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 
    • G02F1/15—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 an electrochromic effect
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • 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

Definitions

  • Quantum dots are particles made from nanomaterials that emit light of specific frequencies upon the application of an electrical current or light.
  • the frequencies of the light emitted by the quantum dots may be varied by changing the dots' size, shape, and type of material.
  • One application of quantum dots are electro-optic displays, specifically, LED displays, because of the potential for improved color accuracy.
  • electro-optic as applied to a material or a display, is used herein in its conventional meaning in the imaging art to refer to a material having first and second display states differing in at least one optical property, the material being changed from its first to its second display state by application of an electric field to the material.
  • the optical property is typically color perceptible to the human eye, it may be another optical property, such as optical transmission, reflectance, luminescence, or in the case of displays intended for machine reading, pseudo-color in the sense of a change in reflectance of electromagnetic wavelengths outside the visible range.
  • Quantum dots are commonly incorporated into an LED display by being provided in the form of a film that is laminated between a back-light unit and a red-green-blue (RGB) color filter.
  • the back-light unit comprises a blue LED and a portion of the emitted blue light is converted into red and green light after passing through the quantum dot film. Therefore, the light exiting the quantum dot film and entering the color filter includes a substantially increased portion of red, green, or blue light.
  • Quantum dot films are manufactured by blending quantum dots in a polymer, such as an epoxy, and applying a barrier layer on either side of the layer of polymer-quantum dot blend.
  • the cured polymer and barrier layers seal the quantum dots from oxygen and water, which may degrade the material over time.
  • quantum dots and polymers such as homogeneity, dispersibility, and performance loss (quantum yield and reliability).
  • the microcells may be formed within a layer of polymeric material and sealed with a sealing material. Also, the microcells may contain a dispersion comprising a solvent and a plurality of quantum dots.
  • a method of making a quantum dot film may comprise providing a layer of polymeric material having a plurality of open microcells, filling the plurality of open microcells with a dispersion comprising a solvent and a plurality of quantum dots, and sealing the microcells.
  • Figure 1 is a side cross-sectional view of a quantum dot film according to a first embodiment of the present invention.
  • Figure 2 is a side cross-sectional view of a display incorporating a quantum dot film according to an embodiment of the present invention.
  • Figures 1 and 2 are schematic drawings that are not drawn to scale for ease of understanding of the various embodiments of the invention.
  • the various embodiments of the present invention provide an improved quantum dot film by eliminating the polymer/quantum dot blends.
  • the films according to various embodiments of the present invention encapsulate the quantum dot film in a plurality of sealed microcells.
  • the dispersions of quantum dots may be encapsulated in optical films using various methods.
  • the quantum dot film 10 may comprise a layer of light- transmissive polymeric material 11 that has been embossed, for example, with a pattern of microcells.
  • the pattern may provide a plurality of microcells in a variety of geometric configurations, e.g. round, oval, cubic, hexagonal, etc.
  • a fluid solvent 16 preferably a liquid.
  • the dispersions are sealed within the microcells with a light-transmissive sealing layer 14 that is preferably made from a curable material.
  • the refractive index of the polymeric material 11, solvent 16, and sealing layer 14 are preferably closely matched.
  • the layer of polymeric material provided with the plurality of microcells may include, but are not limited to, thermoplastic or thermoset materials or a precursor thereof, such as multifunctional vinyls including, but not limited to, acrylates, methacrylates, allyls, vinylbenzenes, vinylethers, multifunctional epoxides and oligomers or polymers thereof, and the like. Multifunctional acrylate and oligomers thereof are often used. A combination of a multifunctional epoxide and a multifunctional acrylate is also useful to achieve desirable physico-mechanical properties of the microcells.
  • the layer of polymeric material comprising the plurality of microcells provides a flexible substrate, thereby enabling the use of various printing or coating techniques, some of which may be inexpensive, in order to fill the microcells with the dispersions containing quantum dots.
  • the polymeric materials may also comprise a polar oligomeric or polymeric material.
  • Such a polar oligomeric or polymeric material may be selected from the group consisting of oligomers or polymers having at least one of the groups such as nitro (-NO2), hydroxyl (-OH), carboxyl (-COO), alkoxy (-OR wherein R is an alkyl group), halo (e.g., fluoro, chloro, bromo or iodo), cyano (-CN), sulfonate (-SO3) and the like.
  • the glass transition temperature of the polar polymer material is preferably below about 100°C and more preferably below about 60°C.
  • Suitable polar oligomeric or polymeric materials may include, but are not limited to, polyhydroxy functionalized polyester acrylates (such as BDE 1025, Bomar Specialties Co, Winsted, CT) or alkoxylated acrylates, such as ethoxylated nonyl phenol acrylate (e.g., SR504, Sartomer Company), ethoxylated trimethylolpropane triacrylate (e.g., SR9035, Sartomer Company) or ethoxylated pentaerythritol tetraacrylate (e.g., SR494, from Sartomer Company).
  • polyhydroxy functionalized polyester acrylates such as BDE 1025, Bomar Specialties Co, Winsted, CT
  • alkoxylated acrylates such as ethoxylated nonyl phenol acrylate (e.g., SR504, Sartomer Company), ethoxylated trimethylolpropane triacrylate (e.g., SR9035,
  • the polymeric material may comprise (a) at least one difunctional UV curable component, (b) at least one photoinitiator, and (c) at least one mold release agent.
  • Suitable difunctional components may have a molecular weight higher than about 200. Difunctional acrylates are preferred and difunctional acrylates having a urethane or ethoxylated backbone are particularly preferred.
  • suitable difunctional components may include, but are not limited to, diethylene glycol diacrylate (e.g., SR230 from Sartomer), triethylene glycol diacrylate (e.g., SR272 from Sartomer), tetraethylene glycol diacrylate (e.g., SR268 from Sartomer), polyethylene glycol diacrylate (e.g., SR295, SR344 or SR610 from Sartomer), polyethylene glycol dimethacrylate (e.g., SR603, SR644, SR252 or SR740 from Sartomer), ethoxylated bisphenol A diacrylate (e.g., CD9038, SR349, SR601 or SR602 from Sartomer), ethoxylated bisphenol A dimethacrylate (e.g., CD540, CD542, SR101, SR150, SR348, SR480 or SR541 from Sartomer), and urethane diacrylate (e.g.,
  • Suitable photoinitiators may include, but are not limited to, bis-acyl-phosphine oxide, 2-benzyl-2-(dimethylamino)-1-[4-(4- morpholinyl)phenyl]-1-butanone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, 2- isopropyl-9H-thioxanthen-9-one, 4-benzoyl-4'-methyldiphenylsulphide and 1-hydroxy- cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1-[4-(2- hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-one, 2,2-dimethoxy-1,2- diphenylethan-1-one or 2-methyl-1[4-(methylthio)phenyl]-2-morpholinopropan-1-one.
  • Suitable mold release agents may include, but are not limited to, organomodified silicone copolymers such as silicone acrylates (e.g., Ebecryl 1360 or Ebecryl 350 from Cytec), silicone polyethers (e.g., Silwet 7200, Silwet 7210, Silwet 7220, Silwet 7230, Silwet 7500, Silwet 7600 or Silwet 7607 from Momentive).
  • the composition may further optionally comprise one or more of the following components, a co-initiator, monofunctional UV curable component, multifunctional UV curable component or stabilizer.
  • the preferred method of providing the polymeric material with microcells is by applying a pattern of microstructures on one surface of the polymeric material, such as the methods described in U.S. Patent No.6,930,818, the content of which is incorporated herein by reference in its entirety.
  • a drum having a three-dimensional pattern on its outer surface may be used to emboss a continuous sheet of polymeric material in a roll-to- roll process.
  • the pattern on the surface of the drum may be in the form of a plurality of microposts, for example.
  • the quantum dot material in the dispersions may comprise one or more particulate material having one or more particle sizes.
  • the quantum dot material emit both green and red light when exposed to blue light.
  • the quantum dot material may include, but is not limited to, CdSe core/shell luminescent nanocrystals, such as CdSe/ZnS, InP/ZnS, PbSe/PbS, CdSe/CdS, CdTe/CdS or CdTe/ZnS nanocrystals.
  • the quantum dot material is preferably provided in the form of nanoparticles having diameters substantially less than the wavelengths of visible light.
  • the term "diameter" is used herein to include what is usually known as the "equivalent diameter" of a non-spherical particle.
  • the nanoparticles used in the present invention need not be spherical or even essentially spherical. Variations in the properties of the nanoparticle displays can be achieved using non-spherical and composite particles, for example particles in which a core of one material is surrounded by a shell of a different material, and the present invention extends to nanoparticle displays and assemblies using such non-spherical and/or composite particles.
  • the non-spherical nanoparticles used in the present invention (which will typically be formed in whole or part from electrically conductive materials) may have a wide variety of shapes.
  • such particles may have the form of ellipsoids, which may have all three principal axes of differing lengths, or may be oblate or prolate ellipsoids of revolution.
  • the non-spherical nanoparticles may alternatively be laminar in form, the term "laminar" being used herein in a broad sense to indicate bodies in which the maximum dimension along one axis is substantially less than the maximum dimension along each of the other two axes; thus, such laminar nanoparticles may have a form similar to the tabular silver halide grains well known in photographic films.
  • the non-spherical nanoparticles may also have the form of frusta of pyramids or cones, or of elongate rods.
  • composite (core/shell) nanoparticles used in the present invention may have any of the forms discussed in the preceding paragraph, and will typically comprise an electrically conductive shell around an insulating core, or an electrically insulating shell around a conductive core.
  • An insulating core may be formed from, for example, silicon, titania, zinc oxide, aluminum silicates, various inorganic salts, or sulfur.
  • the composite nanoparticles may be subjected to surface modification, for example to control the degree to which particles adhere to one another or to any surface with which they come into contact.
  • One preferred type of surface modification is attachment of polymers to the surfaces of the nanoparticles.
  • the quantum dots may remain in the form of a dispersionwhen sealed in the microcells.
  • the dispersion, as described herein, used to fill the microcells may preferably comprise, with increasing preference in the order given, not less than 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5% wt quantum dots and independently preferably is, with increasing preference in the order given, not more than, at least for economy, 0.6, 0.7, 0.8, 0.9, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10% wt quantum dots.
  • the solvent may be a fluid, preferably a liquid that is clear and colorless, and more preferably a fluid with a refractive index that matches the refractive index of the light transmissive microcells and/or sealing layer.
  • suitable solvents include hydrocarbons such as hexane, isopar, decahydronaphthalene (DECALIN), 5-ethylidene-2- norbornene, fatty oils, paraffin oil, silicon fluids, aromatic hydrocarbons such as toluene, xylene, phenylxylylethane, dodecylbenzene or alkylnaphthalene, halogenated solvents such as chloroform, perfluorodecalin, perfluorotoluene, perfluoroxylene, dichlorobenzotrifluoride, 3,4,5 -trichlorobenzotri fluoride, chloropentafluoro-benzene, dichlorononane or pentachlorobenzene,
  • sealing may be accomplished by dispersing a thermoplastic or thermoset precursor in the dispersion fluid, wherein the thermoplastic or thermoset precursor is immiscible in the dispersion fluid and has a specific gravity lower than that of the display fluids.
  • the precursor phase separates from the dispersion and forms a supernatant layer which is then hardened or cured by solvent evaporation, interfacial reaction, moisture, heat or radiation.
  • thermoplastics or thermosets and precursors thereof may include materials such as monofunctional acrylates, monofunctional methacrylates, multifunctional acrylates, multifunctional methacrylates, polyvinyl alcohol, polyacrylic acid, cellulose, gelatin or the like.
  • sealing may be accomplished by applying a sealing layer comprising an aqueous composition over the dispersion-filled microcells that is subsequently dried.
  • the sealing material may be an aqueous solution of a water soluble polymer.
  • suitable water soluble polymers or water soluble polymer precursors may include, but are not limited to, polyvinyl alcohol; polyethylene glycol, its copolymers with polypropylene glycol, and its derivatives, such as PEG-PPG-PEG, PPG-PEG, PPG-PEG-PPG; poly(vinylpyrolidone) and its copolymers such as poly(vinylpyrrolidone)/vinyl acetate (PVP/VA); polysaccharides such as cellulose and its derivatives, poly(glucosamine), dextran, guar gum, and starch; gelatin; melamine-formaldehyde; poly(acrylic acid), its salt forms, and its copolymers; poly(methacrylic acid), its salt forms, and its copolymers; poly(maleic acid), its salt forms, and its copolymers; poly(2-dimethylaminoethyl methacrylate); poly(2-ethyl-2-oxazoline);
  • the sealing material may also include a water dispersible polymer dispersed in water.
  • suitable polymer water dispersions may include polyurethane water dispersions and latex water dispersions.
  • Suitable latexes in the water dispersions include polyacrylate, polyvinyl acetate and its copolymers such as ethylene vinyl acetate, and polystyrene copolymers such as polystyrene butadiene and polystyrene/acrylate.
  • the quantum dot film 10 may optionally include a single or, more preferably, double release sheet 12, 13.
  • an electro-optic display 20 may include a plurality of laminated layers, wherein one of the layers is a quantum dot film 23, as previously described.
  • the quantum dot film 23 may be laminated between a back light unit 22 and a color filter 24.
  • the back light unit 22 may optionally be laminated to a reflective substrate 21 in order to direct light through the quantum dot film 23.
  • the back light unit 22 preferably includes one or more blue LEDs and a light-guide plate configured to evenly distribute the light across the display 20.
  • a layer of shuttering media 26 may be laminated to the color filter 24, such that the color filter 24 is between the quantum dot film 23 and the shuttering media 26.
  • the shuttering media may include any electro-optic media that is capable of being switched between a generally light-missive state and an opaque state. Blue light emitted from the back light unit 22 will pass through the quantum dot film 23, which will convert a portion of the blue light to red and green light.
  • the red, green, and blue light will enter the color filter 24 and filtered depending on the section of the color filter through which the filter passes. For example, the “R” portion will absorb the green and blue light, allowing the red light to pass, the “G” portion will absorb the red and blue light, allowing the green light to pass, and the “B” portion will absorb the red and green light, allowing the blue light to pass.
  • the shuttering media above each section of the color filter 24 may be independently switched to allow a combination and/or selection of red, green, and blue light to pass and ultimately emitted by the display.
  • Types of electro-optic media that may be used as a shuttering layer include, but are not limited to, liquid crystals, electro-chromic materials, and a di-electrophoretic dispersion.
  • a series of light-transmissive electrodes 25 may be provided between the layer of shuttering media 26 and the color filter 24, and a continuous, light-transmissive front electrode 27 may be applied on the opposing side of the layer of shuttering media 26.
  • the light-transmissive electrodes may be a thin metal or metal oxide layer of, for example, aluminum or ITO, or may be a conductive polymer.
  • a light-transmissive protective layer 28 may be provided as an outer viewing surface of the display 20.
  • the color filter layer 24 and the plurality light-transmissive electrodes 25 may be combined into one layer, such that the electrodes are made from a light-transmissive colored conductive material.
  • the two electrode layers 25 and 27 may be reversed, such that the continuous electrode layer 27 is sandwiched between the shuttering layer 26 and the color filter 24 and the plurality of light-transmissive electrodes 25 is located adjacent the front protective layer 28.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Optical Filters (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

Film à boîtes quantiques comprenant une pluralité de microcellules scellées. Les microcellules peuvent être formées à l'intérieur d'une couche de matériau polymère et scellées avec un matériau d'étanchéité. Les microcellules peuvent également contenir une dispersion d'un solvant et d'une pluralité de boîtes quantiques. Un procédé de fabrication d'un film à boîtes quantiques comprend la fourniture d'une couche de matériau polymère ayant une pluralité de microcellules ouvertes, le remplissage de la pluralité de microcellules ouvertes avec une dispersion d'un solvant et d'une pluralité de boîtes quantiques, et l'étanchéification des microcellules.
EP20930284.3A 2020-04-08 2020-04-08 Film à boîtes quantiques Withdrawn EP4133023A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2020/027184 WO2021206703A1 (fr) 2020-04-08 2020-04-08 Film à boîtes quantiques

Publications (2)

Publication Number Publication Date
EP4133023A1 true EP4133023A1 (fr) 2023-02-15
EP4133023A4 EP4133023A4 (fr) 2023-12-20

Family

ID=78023392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20930284.3A Withdrawn EP4133023A4 (fr) 2020-04-08 2020-04-08 Film à boîtes quantiques

Country Status (5)

Country Link
EP (1) EP4133023A4 (fr)
JP (1) JP2023520928A (fr)
KR (1) KR20220149596A (fr)
CN (1) CN115175972A (fr)
WO (1) WO2021206703A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117821062A (zh) * 2023-12-26 2024-04-05 南方科技大学 量子点多孔膜、量子点光学膜及其制备方法、显示设备

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Publication number Priority date Publication date Assignee Title
US6930818B1 (en) * 2000-03-03 2005-08-16 Sipix Imaging, Inc. Electrophoretic display and novel process for its manufacture
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WO2021206703A1 (fr) 2021-10-14
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JP2023520928A (ja) 2023-05-22
CN115175972A (zh) 2022-10-11

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