WO2020177787A2 - 一种量子点复合增亮膜及其制备方法 - Google Patents

一种量子点复合增亮膜及其制备方法 Download PDF

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WO2020177787A2
WO2020177787A2 PCT/CN2020/096383 CN2020096383W WO2020177787A2 WO 2020177787 A2 WO2020177787 A2 WO 2020177787A2 CN 2020096383 W CN2020096383 W CN 2020096383W WO 2020177787 A2 WO2020177787 A2 WO 2020177787A2
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layer
quantum dot
brightness enhancement
enhancement film
composite brightness
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PCT/CN2020/096383
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English (en)
French (fr)
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WO2020177787A3 (zh
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刘勇
谢彬彬
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南京贝迪电子有限公司
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Priority to KR1020207024748A priority Critical patent/KR102507264B1/ko
Priority to US16/965,882 priority patent/US11460614B2/en
Publication of WO2020177787A2 publication Critical patent/WO2020177787A2/zh
Publication of WO2020177787A3 publication Critical patent/WO2020177787A3/zh

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    • C—CHEMISTRY; METALLURGY
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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/56—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing sulfur
    • C09K11/562—Chalcogenides
    • C09K11/565—Chalcogenides with zinc cadmium
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    • 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
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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    • C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
    • C—CHEMISTRY; METALLURGY
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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
    • C09K11/881—Chalcogenides
    • C09K11/883—Chalcogenides with zinc or cadmium
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    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
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    • G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
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    • 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
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    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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Definitions

  • the invention relates to the field of optical film films, in particular to a quantum dot composite brightness enhancement film and a preparation method thereof.
  • Quantum Dots are semiconductor nanocrystals.
  • the energy band structure of quantum dots can be changed by adjusting the size of quantum dots. Therefore, after being excited by a light source, they can emit light of different wavelengths.
  • the quantum dot film takes advantage of this feature. Under the illumination of the blue backlight, the red and green quantum dots in the quantum dot film are excited to emit red and green light, which are mixed with the unconverted blue light to form white light.
  • LCD displays using quantum dot film only replace the blue backlight, and the other structures are basically unchanged.
  • the color gamut can be increased from 70% NTSC1931 to more than 110%.
  • the composite brightness enhancement film is a composite of multiple optical films. Compared with the traditional optical film, the composite brightness enhancement film has lower thickness, lower cost, higher assembly efficiency and higher brightness, which greatly reduces the scratches caused by friction between the diaphragm and the diaphragm. Injuries, scratches, etc.
  • the composite brightness enhancement film includes two film structures, one structure is a composite film (COP) of diffusion layer + core layer + prism layer, and the other is a multilayer composite film of diffusion layer + core layer + prism layer + prism layer (COPP). Wherein, the core layers are all 3M core layers.
  • the quantum dot composite brightness enhancement film is a composite of the quantum dot film and the composite brightness enhancement film.
  • the wide color gamut effect of the quantum dot film can be organically combined with the diffusion and brightness enhancement effects of the composite brightness enhancement film.
  • the use of such a composite film can reduce the thickness of the overall module, simplify the installation difficulty of the module, and facilitate the development of subsequent ultra-thin display products.
  • a multifunctional quantum dot film disclosed in the patent application CN201710270818.9 includes a quantum dot layer, an upper barrier layer and a lower barrier layer on both sides of the quantum dot layer, and a prism layer provided on the upper barrier layer.
  • the light diffusion layer on the lower barrier layer; the quantum dot layer is composed of resin, monomer, photoinitiator, diffusion particles, red quantum dots, and green quantum dots; the light diffusion layer is composed of organic polymer particles and thermosetting resin; the patent Started to add brightness enhancement function and diffusion function to the quantum dot film to replace the lower diffusion film and the lower brightness enhancement film in the traditional backlight module, but the above method has some obvious disadvantages, including: (1) The same layer of quantum dot film It has been coated multiple times on the surface, which greatly increases the process defects and reduces the production yield; (2) The process is cumbersome and easy to produce defects; (3) In addition to the curing of the quantum dot glue, additional curing is required on the surface of the quantum dot film Two times of glue, it is difficult to ensure that the diaphragm as a whole does not deform under the action of external force.
  • the purpose of the present invention is to provide a quantum dot composite brightness enhancement film and a preparation method thereof, which are simple to operate, do not need to coat the quantum dot layer for multiple times, reduce manufacturing process defects, and improve the performance of the quantum dot composite brightness enhancement film.
  • a quantum dot composite brightness enhancement film arranged as a multilayer structure composed of a quantum dot film layer, a composite brightness enhancement film layer and an OCA optical adhesive layer; wherein the quantum dot The dot film layer includes a back coating, a substrate layer, a first barrier layer, a quantum dot layer, and a second barrier layer that are sequentially attached, and the first barrier layer and the second barrier layer are water and oxygen barrier films; the composite The brightness enhancement film layer includes a diffusion layer, a core layer, and a prism layer in sequential contact; the OCA optical adhesive layer is arranged between the quantum dot film layer and the composite brightness enhancement film layer, and one side of the OCA optical adhesive layer is bonded and connected to the quantum dots The second barrier layer of the film layer is in contact with the diffusion layer connected to the composite brightness enhancement film layer on the opposite side.
  • the quantum dot layer is a glue system composed of a mixture of matrix resin, quantum dots, quantum dot stabilizer, scattering particles, initiator and diluent;
  • the matrix resin is silicone resin, epoxy resin, polypropylene One or more of amide, polyurethane, isocyanate, photocurable resin, and thermosetting resin;
  • the quantum dot is a core-shell structure composed of semiconductor materials, including a quantum dot central core and an outer shell;
  • the quantum dot central core is Scattering particles, the outer shell is quantum dot nanoparticles;
  • the scattering particles are inorganic particles and/or organic particles, and the inorganic particles are nano-silica, nano-titania, nano-calcium dioxide, and nano-zirconia.
  • the organic particles are organic silicon nanoparticles and/or acrylic nanoparticles;
  • the quantum dot nanoparticles are MgS, CdTe, CdSe, CdS, CdZnS, ZnSe, ZnTe, ZnS, ZnO, One or more of GaAs, GaN, GaP, InP, InAs, InN, InSb, AlP, AlSb;
  • the quantum dot stabilizer is one or more of toluene, n-hexane, chloroform, and isobornyl acrylate;
  • the initiator is a photoinitiator and/or a thermal initiator;
  • the diluent is one or more of toluene, acetone, methyl ethyl ketone, acetonitrile, ethanol, acetic acid, ethyl acetate, butyl acetate, and n-butyl ether.
  • a glue system composed of matrix resin and quantum dots is used to encapsulate quantum dots.
  • a water-oxygen barrier film is used as a barrier layer to further protect the glue system of quantum dots and reduce the quenching of quantum dots.
  • the thickness of the back coating in the quantum dot film layer is 5-10 ⁇ m
  • the thickness of the substrate layer is 45-115 ⁇ m
  • the thickness of the quantum dot layer is 50-100 ⁇ m; on the premise of ensuring the optical performance of the quantum dot film layer
  • adjusting the thickness of the back coating, the substrate layer and the quantum dot layer is beneficial to the weight reduction of the quantum dot composite brightness enhancement film.
  • the diffusion layer, the core layer and the prism layer of the composite brightness enhancement film layer are cured and bonded by an ultraviolet light curing adhesive, and the thickness of the ultraviolet light curing adhesive is 5-10 ⁇ m.
  • the diffusion layer is used to correct the light diffusion angle and has a thickness of 50-100 ⁇ m;
  • the core layer is a 3M brightness enhancing polarizing film with a thickness of 20-50 ⁇ m;
  • the prism layer is used to increase the recovery of the backlight, Its thickness is 50-200 ⁇ m.
  • the composite brightness enhancement film includes two prism layers bonded with ultraviolet curing glue, which is beneficial to concentrate the scattered light as much as possible in the range of 70° of the normal to emit light and improve the brightness of the display.
  • the invention also discloses a preparation method of the quantum dot composite brightness enhancement film, which specifically includes the following steps:
  • Quantum dots are dissolved in a quantum dot stabilizer to obtain a quantum dot solution; after the quantum dot solution is mixed with matrix resin, scattering particles, initiator and diluent, it is coated through a slit, and is attached to the upper layer side respectively.
  • the first barrier layer and the lower second barrier layer of the base material layer are bonded together, and under the action of light and heating, the middle quantum dot layer is cured to form a quantum dot film layer;
  • the diffusion layer, the core layer and the prism layer are cured and bonded in sequence by using ultraviolet curing glue, and the prism layer is set into one or two layers according to actual production needs to make a composite brightness enhancement film layer;
  • the quantum dot film layer is attached to the diffusion layer of the composite brightness enhancement film layer from the second barrier layer side to form a quantum dot composite brightness enhancement film.
  • the quantum dot composite brightness enhancement film is set as a multilayer structure composed of a quantum dot film layer, an OCA optical adhesive layer and a composite brightness enhancement film layer in sequence;
  • the dot film layer includes a back coating layer, a substrate layer, a first barrier layer, a quantum dot layer, and a second barrier layer that are sequentially laminated, and the composite brightness enhancement film layer includes a diffusion layer, a core layer, and a prism layer that are sequentially in contact;
  • the quantum dot composite brightness enhancement film adopts a multilayer film structure, which reduces the quantum dot film by one substrate layer, reduces the total thickness of the quantum dot composite brightness enhancement film, and facilitates the application of the quantum dot composite brightness enhancement film to the backlight module Lightweight.
  • the quantum dot layer is a glue system composed of matrix resin, which is directly coated between the first barrier layer and the second barrier layer composed of water and oxygen barrier film to reduce the quenching of the quantum dots, protect the quantum dot layer, and directly Avoid the need to perform multiple coating operations on the same quantum dot layer, reduce the possibility of warpage and deformation of the diaphragm, reduce process defects, reduce and improve the performance of the quantum dot composite brightness enhancement film, and reduce module installation time and diaphragm Scratches, scratches, etc.; and the quantum dot film is directly cured under light and heating conditions, with simple process and convenient operation.
  • the OCA optical adhesive layer is selected to connect the quantum dot film layer and the composite brightness enhancement film layer, and at least one prism layer is arranged on the outermost side of the quantum dot film layer away from the back coating, so as to concentrate as much scattered light as possible on The light is emitted within the range of 70° of the normal, which greatly improves the brightness of the back display of the quantum dot composite brightness enhancement film.
  • Figure 1 is a schematic diagram of the quantum dot film of the present invention
  • Figure 2 is a schematic diagram of the composite brightness enhancement film of the present invention.
  • Figure 3 is a schematic diagram of the quantum dot composite brightness enhancement film of the present invention.
  • 101-substrate layer 101-substrate layer, 102-first barrier layer, 103-quantum dot layer, 104-green quantum dot, 105-red quantum dot, 106-scattering particles, 107-matrix resin, 108-back coating, 109-section
  • Two barrier layers 201-diffusion layer, 202-core layer, 203-prism layer, 204-ultraviolet curing adhesive layer, 301-OCA optical adhesive layer.
  • the present invention aims to propose a quantum dot composite brightness enhancement film and a preparation method thereof, the process is simple, the quantum dot composite brightness enhancement film is arranged in a multilayer structure, and the quantum dot layer 103 constituting the glue system is coated on the first Between the barrier layer 102 and the second barrier layer 109, multiple coatings and multiple glue curing on the same layer of quantum dot film are directly avoided to reduce manufacturing process defects; at the same time, when the quantum dot film and the composite brightness enhancement film are assembled together , By adjusting the thickness of each film layer and reducing a base layer 101, the weight is reduced.
  • a quantum dot composite brightness enhancement film is arranged as a multilayer structure composed of a quantum dot film layer, a composite brightness enhancement film layer and an OCA optical adhesive layer 301; wherein, the quantum dot film layer includes successively The back coating layer 108, the base material layer 101, the first barrier layer 102, the quantum dot layer 103 and the second barrier layer 109 are bonded together, and the first barrier layer 102 and the second barrier layer 109 are water and oxygen barrier films;
  • the composite brightness enhancement film layer includes a diffusion layer 201, a core layer 202, and a prism layer 203 that are in sequential contact;
  • the OCA optical adhesive layer 301 is disposed between the quantum dot film layer and the composite brightness enhancement film layer, and the OCA optical adhesive layer 301 is The second barrier layer 109 connected to the quantum dot film layer is attached to the side to contact, and the opposite side is attached to the diffusion layer 201 connected to the composite brightness enhancement film layer.
  • the quantum dot layer 103 is a glue system composed of a mixture of matrix resin 107, quantum dots, quantum dot stabilizer, scattering particles 106, initiator and diluent.
  • the quantum dots include green quantum dots 104 and red
  • the quantum dot 105 uses the matrix resin 107 and the quantum dot to form a glue system to encapsulate the quantum dot, which can encapsulate and protect the quantum dot and reduce the quenching of the quantum dot.
  • the quantum dot is a core-shell structure composed of semiconductor materials, including a central core and an outer shell of the quantum dot; the material of the quantum dot is MgS, CdTe, CdSe, CdS, CdZnS, ZnSe, ZnTe, ZnS, ZnO, One or more of GaAs, GaN, GaP, InP, InAs, InN, InSb, AlP, AlSb, for example, the central core is a CdSe core and the shell is a ZnS shell. Due to the different sizes of quantum dots, the general size is 2-10nm. The wavelength of the emitted light of quantum dots varies with the particle size and composition.
  • the scattering particles 106 may be inorganic particles and/or organic particles.
  • the inorganic particles are generally one or more of nano-silica, nano-titania, nano-calcium dioxide, and nano-zirconia, and the organic particles are organic particles. Silicon-based nanoparticles and/or acrylic nanoparticles.
  • the matrix resin 107 can be selected from one or more of silicone resin, epoxy resin, polyacrylamide, polyurethane, isocyanate, light curing resin, and thermosetting resin.
  • Quantum dot stabilizer One or more of toluene, n-hexane, chloroform, and isobornyl acrylate are selected, the initiator is photoinitiator and/or thermal initiator, and the diluent is toluene, acetone, methyl ethyl ketone, acetonitrile, ethanol, One or more of acetic acid, ethyl acetate, butyl acetate, and n-butyl ether.
  • the water-oxygen barrier film selected for the first barrier layer 102 and the second barrier layer 109 of the present invention can further protect the glue system of the quantum dot layer 103, reduce the quenching of the quantum dots, and improve the performance of the quantum dot film.
  • the diffusion layer 201, the core layer 202 and the prism layer 203 of the composite brightness enhancement film layer are cured and bonded by an ultraviolet curing adhesive 204, and to improve the brightness enhancement effect of the quantum dot composite brightness enhancement film
  • One or two prism layers 203 can be attached to the composite brightness enhancement film layer.
  • the two prism layers 203 are connected and fixed by the ultraviolet curing adhesive 204.
  • the thickness of the ultraviolet curing adhesive is In order to coat 5-10 ⁇ m; in the present invention, the prism layer 203 is arranged on the side far from the quantum dot film layer, which helps to concentrate the scattered light as much as possible within the range of 70° of the normal to emit light, increase the recovery of the backlight, and greatly Improve the brightness of the quantum dot composite brightness enhancement film when applied to displays.
  • the back coating 108 of the quantum dot film layer has been subjected to surface roughening treatment to avoid
  • the quantum dot film layer is scratched and scratched, and the thickness is 5-10 ⁇ m;
  • the material of the substrate layer 101 is PET (polyethylene terephthalate), the thickness is 45-115 ⁇ m;
  • the thickness of the glue system of the quantum dot layer 103 is 50-100 ⁇ m;
  • the diffusion layer 201 in the composite brightness enhancement layer is used to correct the light diffusion angle and cover the defects of the light guide plate, so that the radiation area of the backlight source is larger and the uniformity is better, and its thickness is 50-100 ⁇ m;
  • the core The layer 202 is a 3M brightness-enhancing polarizing film with a thickness of 20-50 ⁇ m;
  • the prism layer 203 is used to increase the recovery of the backlight, so that the scattered light can be reflected back and used again, so that the brightness of the axis center is increased by more
  • the thickness of each layer structure is adjusted, that is, the thickness of the back coating 108, the substrate layer 101, the quantum dot layer 103, the diffusion layer 201, the core layer 202 and the prism layer 103
  • the thickness adjustment is beneficial to the lightweight and performance adjustment of the quantum dot composite brightness enhancement film.
  • the present invention also discloses a method for preparing a quantum dot composite brightness enhancement film with simple operation and simple process, which specifically includes the following steps :
  • quantum dots are dissolved in the quantum dot stabilizer to obtain the quantum dot solution; after the quantum dot solution is mixed with the matrix resin 107, the scattering particles 106, the initiator and the diluent, it is coated through a slit and attached to the upper side respectively.
  • the first barrier layer 102 with the base layer 101 and the lower second barrier layer 109 are bonded together, and under the action of light and heat, the middle quantum dot layer 103 is cured to form a quantum dot film layer; (2) adopt The ultraviolet curing adhesive layer 204 cures and bonds the diffusion layer 201, the core layer 202 and the prism layer 203 in sequence, and the prism layer 203 is set as one or two layers according to actual production needs to form a composite brightness enhancement film layer; (3) adopt The OCA optical glue 301 attaches the quantum dot film layer from the second barrier layer 109 to the diffusion layer 201 of the composite brightness enhancement film layer to form a quantum dot composite brightness enhancement film.
  • the quantum dots are dissolved in the quantum dot stabilizer to obtain the quantum dot solution.
  • the quantum dot solution is mixed with the matrix resin 107, the scattering particles 106, the initiator and the diluent, it is coated with the upper layer through a slit.
  • the first barrier layer 102 with the PET layer and the lower second barrier layer 109 are bonded together, and under the action of light and heating, the middle quantum dot layer 103 is cured to form a quantum dot film layer, which can then be wound into a roll Secondly, prepare the composite brightness enhancement film: the diffusion layer 201, the core layer 202, and the prism layer 203 are cured and bonded by ultraviolet curing glue (UV glue), and the thickness of the UV glue during bonding is 5-10 ⁇ m. The composite brightness enhancement film can then be rolled into a roll.
  • UV glue ultraviolet curing glue
  • the composite brightness enhancement film is only provided with a prism layer 203; finally, the second barrier layer 109 of the quantum dot film layer is brightened by OCA optical glue and composite
  • the diffusion layer 201 of the film layer is laminated to form a quantum dot composite brightness enhancement film, and the OCA optical adhesive forms an OCA optical adhesive layer 301 between the quantum dot film layer and the composite brightness enhancement film layer.
  • Example 2 The difference between Example 2 and Example 1 is that the prepared composite brightness enhancement film is provided with two prism layers 203 on the side of the core layer 202 away from the diffusion layer 201, and the two prism layers 203 are cured and bonded by UV glue. The other preparation process of the dot composite brightening film remains unchanged.
  • Example 2 Compared with Example 1, after adding a prism layer, the brightness of the quantum dot composite brightness enhancement film increased by 5.3%.
  • Example Difference Brightness (cd/m 2 ) Example 1 A prism layer 4318 Example 2 Two prism layers 4549
  • the quantum dot composite brightness enhancement film disclosed in the present invention sets the quantum dot composite brightness enhancement film in a multi-layer structure, and does not need to coat the quantum dot film multiple times.
  • the quantum dot film is reduced by one substrate layer and adjusted
  • the thickness of the layer structure reduces the total thickness of the quantum dot composite brightness enhancement film, which is beneficial to the light weight of the quantum dot composite brightness enhancement film applied to the backlight module and improves the product performance; the present invention also reduces the quantum dot composite brightness enhancement film
  • the process times of glue curing during the film preparation process can reduce the warpage and deformation of the film and greatly reduce the manufacturing process defects.
  • the preparation method of the quantum dot composite brightness enhancement film of the present invention has simple process technology and convenient operation, which can greatly reduce The module assembly time greatly reduces the module installation time and the scratches and scratches between the diaphragms.

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Abstract

本发明提供一种量子点复合增亮膜及其制备方法，涉及光学膜薄膜领域；所述量子点复合增亮膜包括由依次贴合的背涂层、基材层、第一阻隔层、量子点层和第二阻隔层构成的量子点膜层、由依次贴合的扩散层、核心层和棱镜层构成的复合增亮膜层，以及连接第二阻隔层和扩散层的OCA光学胶层；本发明的量子点复合增亮膜设置有上述的多层膜结构，通过减少一层基材层，降低了量子点复合增亮膜的总厚度，有利于量子点复合增亮膜应用于背光模组的轻量化，同时避免在量子点层上进行多次涂布的操作，减少制程不良，有效提高量子点复合增亮膜的性能。

Description

一种量子点复合增亮膜及其制备方法 技术领域
本发明涉及光学膜薄膜领域，具体涉及一种量子点复合增亮膜及其制备方法。
背景技术
量子点(Quantum Dots，QDs)是一种半导体纳米晶体，可以通过调节量子点的尺寸来改变它的能带结构，因而受到光源的激发后，可以发射出不同波长的光线。量子点膜正是利用了这一特性，在蓝色背光的照射下，量子点膜中的红色和绿色量子点受到激发发出红色和绿色光线，与未被转化的蓝光混合在一起形成白光。相对于传统LCD显示器，使用量子点膜的LCD显示器只是更换了蓝光背光源，其他结构基本没有改变，色域可以从70％NTSC1931提升到110％以上。
复合增亮膜是将多层光学膜复合在一起。相比于传统的光学膜，复合增亮膜具有更低的厚度、更低的成本、更高的组装效率和更高的亮度，大大减少了膜片与膜片之间由于摩擦所导致的划伤、刮伤等问题。复合增亮膜包括了两种膜结构，一种结构是扩散层+核心层+棱镜层的复合膜(COP)，另一种是扩散层+核心层+棱镜层+棱镜层的多层复合膜(COPP)。其中，所述的核心层均为3M核心层。
量子点复合增亮膜是将量子点膜与复合增亮膜进行了复合，此种方式可以将量子点膜广色域的效果与复合增亮膜的扩散和增亮的效果进行了有机结合。使用此种复合膜，可以降低整体模组的厚度，简化模组的安装难度，利于发展后续的超薄显示产品。
现有技术中如专利申请CN201710270818.9公开的一种多功能量子点膜，包括量子点层，分别设于量子点层两面的上、下阻隔层，设于上阻隔层上的棱镜层，设于下阻隔层上的光扩散层；量子点层由树脂、单体、光引发剂、扩散粒子、红色量子点、绿色量子点组成；光扩散层由有机高分子粒子和热固性树脂组成；该专利着手于在量子点膜上增加增 亮功能和扩散功能替代传统背光模组中的下扩散膜和下增亮膜，但是上述方式存在一些明显的缺点，包括：(1)在同一层量子点膜上进行了多次涂布，大大增加了制程不良，降低了生产良率；(2)工艺繁琐，容易产生不良；(3)除了量子点胶水的固化外，还需在量子点膜表面额外固化两次胶水，难以保证膜片整体在外力作用下不发生变形。
发明内容
本发明目的在于提供一种量子点复合增亮膜及其制备方法，操作简单，无需对量子点层进行多次涂布，减少制程不良，提高量子点复合增亮膜的性能。
为达成上述目的，本发明提出如下技术方案：一种量子点复合增亮膜，设置为由量子点膜层、复合增亮膜层和OCA光学胶层构成的多层结构；其中，所述量子点膜层包括依次贴合的背涂层、基材层、第一阻隔层、量子点层和第二阻隔层，所述第一阻隔层和第二阻隔层为水氧阻隔膜；所述复合增亮膜层包括依次接触的扩散层、核心层和棱镜层；所述OCA光学胶层设置在量子点膜层和复合增亮膜层之间，OCA光学胶层一侧贴合连接于量子点膜层的第二阻隔层接触，相对侧贴合连接于复合增亮膜层的扩散层。
进一步的，所述量子点层为由基质树脂、量子点、量子点稳定剂、散射粒子、引发剂和稀释剂混合组成的胶水体系；所述基质树脂为有机硅树脂、环氧树脂、聚丙烯酰胺、聚氨酯、异氰酸酯、光固化树脂、热固化树脂的一种或多种；所述量子点为半导体材料构成的核壳结构，包括量子点中心核和外层壳；所述量子点中心核为散射粒子，所述外层壳为量子点纳米粒子；所述散射粒子为无机粒子和/或有机粒子，所述无机粒子为纳米二氧化硅、纳米二氧化钛、纳米二氧化钙、纳米二氧化锆中的一种或多种，所述有机粒子为有机硅类纳米粒子和/或丙烯酸类纳米粒子；所述量子点纳米粒子为MgS、CdTe、CdSe、CdS、CdZnS、ZnSe、ZnTe、ZnS、ZnO、GaAs、GaN、GaP、InP、InAs、InN、InSb、AlP、AlSb的一种或多种；所述量子点稳定剂为甲苯、正己烷、氯仿、丙烯酸异冰片酯的一种或多种；所述引发剂为光引发剂和/或热引发剂；所 述稀释剂为甲苯、丙酮、丁酮、乙腈、乙醇、乙酸、乙酸乙酯、乙酸丁酯、正丁醚的一种或多种。
基于量子点容易发生猝灭，因而采用基质树脂与量子点构成胶水体系对量子点进行封装，同时，采用水氧阻隔膜作为阻隔层进一步对量子点的胶水体系进行保护，减少量子点的猝灭。
进一步的，所述量子点膜层中背涂层的厚度为5-10μm，基材层的厚度为45-115μm，量子点层的厚度为50-100μm；在保证量子点膜层光学性能的前提下，调整背涂层、基材层和量子点层的厚度有利于量子点复合增亮膜的轻量化。
进一步的，所述复合增亮膜层的扩散层、核心层及棱镜层之间采用紫外光固化胶固化贴合，所述紫外光固化胶的厚度为5-10μm。
进一步的，所述扩散层用于修正光扩散角度，其厚度为50-100μm；所述核心层为3M增亮偏光膜，其厚度为20-50μm；所述棱镜层用于增加背光的回收，其厚度为50-200μm。
进一步的，所述的复合增亮膜中包括两层采用紫外光固化胶贴合的棱镜层，有利于尽可能多地将分散的光线集中在法线70°范围内出光，提高显示器亮度。
本发明还公开了一种量子点复合增亮膜的制备方法，具体包括如下步骤：
(1)量子点溶解于量子点稳定剂中，得到量子点溶液；量子点溶液与基质树脂、散射粒子、引发剂和稀释剂混合后，通过狭缝涂布，分别与上层一侧贴合有基材层的第一阻隔层、下层第二阻隔层贴合，并在光照和加热的作用下，中间量子点层发生固化，制成量子点膜层；
(2)采用紫外光固化胶将扩散层、核心层及棱镜层依次固化贴合，棱镜层按照实际生产需要设置为一层或两层，制成复合增亮膜层；
(3)采用OCA光学胶将量子点膜层自第二阻隔层侧与复合增亮膜层的扩散层贴合，制成量子点复合增亮膜。
由以上技术方案可知，本发明技术方案提供的量子点复合增亮膜及其制备方法获得了如下有益效果：
本发明公开的量子点复合增亮膜及其制备方法，将量子点复合增亮 膜设置为由量子点膜层、OCA光学胶层和复合增亮膜层依次贴合构成的多层结构；量子点膜层包括依次贴合的背涂层、基材层、第一阻隔层、量子点层和第二阻隔层，复合增亮膜层包括依次接触的扩散层、核心层和棱镜层；本发明的量子点复合增亮膜采用多层膜结构，将量子点膜减少一层基材层，降低了量子点复合增亮膜的总厚度，有利于量子点复合增亮膜应用于背光模组的轻量化。其中，量子点层为由基质树脂构成的胶水体系，直接涂布在由水氧阻隔膜构成的第一阻隔层和第二阻隔层之间，减少量子点的淬灭，保护量子点层，直接避免需要在同一层量子点层上进行多次涂布的操作，减少膜片发生翘曲变形的可能，减少制程不良，减少提高量子点复合增亮膜的性能，降低模组安装时间和膜片间的划伤、刮伤等；并且量子点膜层在光照和加热条件下直接固化，工艺简单，操作方便。
此外，选用OCA光学胶层连接量子点膜层和复合增亮膜层，至少一层棱镜层设置在量子点膜层远离背涂层的最外侧的方案，尽可能多地将分散的光线集中在法线70°范围内出光，大幅提高该量子点复合增亮膜用于显示器后显示器的亮度。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图，而并不超出本发明要求保护的范围。
图1为本发明量子点膜示意图；
图2为本发明复合增亮膜示意图；
图3为本发明量子点复合增亮膜示意图。
图中，各标记的具体意义为：
101-基材层，102-第一阻隔层，103-量子点层，104-绿量子点，105-红量子点，106-散射粒子，107-基质树脂，108-背涂层，109-第二阻隔层，201-扩散层，202-核心层，203-棱镜层，204-紫外光固化胶层，301-OCA光学胶层。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
基于现有技术中在制备多功能量子点膜时，一般工艺过程繁琐，通常需要在同一层量子点膜上进行多次涂布和多次胶水固化，大大增加了制程不良，降低了膜层生产良率；本发明旨在提出一种量子点复合增亮膜及其制备方法，工艺简单，量子点复合增亮膜设置为多层结构，通过构成胶水体系的量子点层103涂布在第一阻隔层102和第二阻隔层109之间，直接避免在同一层量子点膜上进行多次涂布和多次胶水固化，减少制程不良；同时在量子点膜与复合增亮膜贴合组装时，通过调整各膜层厚度及减少一层基材层101的方式实现轻量化。
下面结合附图所示的实施例，对本发明的量子点复合增亮膜及其制备方法作进一步具体介绍。
结合图3所示，一种量子点复合增亮膜，设置为由量子点膜层、复合增亮膜层和OCA光学胶层301构成的多层结构；其中，所述量子点膜层包括依次贴合的背涂层108、基材层101、第一阻隔层102、量子点层103和第二阻隔层109，所述第一阻隔层102和第二阻隔层109为水氧阻隔膜；所述复合增亮膜层包括依次接触的扩散层201、核心层202和棱镜层203；所述OCA光学胶层301设置在量子点膜层和复合增亮膜层之间，OCA光学胶层301一侧贴合连接于量子点膜层的第二阻隔层109接触，相对侧贴合连接于复合增亮膜层的扩散层201。
结合图1所示，所述量子点层103为由基质树脂107、量子点、量子点稳定剂、散射粒子106、引发剂和稀释剂混合组成的胶水体系，量子点包括绿量子点104和红量子点105，采用基质树脂107与量子点构成胶水体系对量子点进行封装，能对量子点进行一道封装保护，减少量子点的猝灭。
在实施例中，量子点是由半导体材料构成的核壳结构，包括量子点中心核和外层壳；量子点的材质是MgS、CdTe、CdSe、CdS、CdZnS、ZnSe、ZnTe、ZnS、ZnO、GaAs、GaN、GaP、InP、InAs、InN、InSb、AlP、AlSb的一种或多种，例如中心核是CdSe核，壳是ZnS壳。由于量子点尺寸的不同，一般尺寸为2-10nm，量子点的发射光波长随粒径和组成成分的不同而产生变化，一般说来，包括绿量子点104和红量子点105，绿量子点104的粒径较小，红量子点105的粒径较大。具体实施时，散射粒子106可选无机粒子和/或有机粒子，无机粒子一般为纳米二氧化硅、纳米二氧化钛、纳米二氧化钙、纳米二氧化锆中的一种或多种，有机粒子为有机硅类纳米粒子和/或丙烯酸类纳米粒子。
为构成封装量子点的胶水体系，所述基质树脂107可以选用有机硅树脂、环氧树脂、聚丙烯酰胺、聚氨酯、异氰酸酯、光固化树脂、热固化树脂的一种或多种，量子点稳定剂选用甲苯、正己烷、氯仿、丙烯酸异冰片酯的一种或多种，所述引发剂选用光引发剂和/或热引发剂，所述稀释剂选用甲苯、丙酮、丁酮、乙腈、乙醇、乙酸、乙酸乙酯、乙酸丁酯、正丁醚的一种或多种。
同时，本发明中第一阻隔层102和第二阻隔层109选用水氧阻隔膜能够进一步对量子点层103的胶水体系进行保护，减少量子点的猝灭，提高量子点膜层的性能。
结合图2所示，所述复合增亮膜层的扩散层201、核心层202及棱镜层203之间采用紫外光固化胶204固化贴合，并且为提高量子点复合增亮膜的增亮效果，所述复合增亮膜层中可以设置贴合一层或两层棱镜层203，两层棱镜层203之间采用紫外光固化胶204连接固定，通常在具体操作时，紫外光固化胶的厚度为涂覆5-10μm；本发明将棱镜层203设置在远离量子点膜层的一侧有利于尽可能多地将分散的光线集中在法线70°范围内出光，增加背光的回收，进而大幅提高量子点复合增亮膜应用于显示器时的亮度。
进一步结合图1和图2所示，为提高量子点复合增亮膜在应用时的轻量化和产品的性能及质量，所述量子点膜层中背涂层108进行了表面粗糙处理，避免对量子点膜层划伤和刮伤，厚度为5-10μm；基材层101的材料为PET(聚对苯二甲酸乙二酯)，厚度为45-115μm；量子点层103胶水体 系的厚度为50-100μm；所述复合增亮层中扩散层201用于修正光扩散角度，遮盖导光板缺陷，使得背光源的辐射面积更大、均匀度更好，其厚度为50-100μm；所述核心层202为3M增亮偏光膜，其厚度为20-50μm；所述棱镜层203用于增加背光的回收，让分散的光重新反射回来再次被利用，使轴中心亮度增加110％以上，其厚度为50-200μm。在保证量子点膜层光学性能的前提下，通过对各层结构的厚度调节，即对背涂层108、基材层101、量子点层103、扩散层201、核心层202和棱镜层103的厚度调节有利于量子点复合增亮膜的轻量化和性能调整。
为解决上述量子点膜层制备工艺繁琐，制程不良，生产良率不高的技术问题，本发明还公开了一种操作简便，工艺简单的量子点复合增亮膜的制备方法，具体包括如下步骤：
(1)量子点溶解于量子点稳定剂中，得到量子点溶液；量子点溶液与基质树脂107、散射粒子106、引发剂和稀释剂混合后，通过狭缝涂布，分别与上层一侧贴合有基材层101的第一阻隔层102、下层第二阻隔层109贴合，并在光照和热量的作用下，中间量子点层103发生固化，制成量子点膜层；(2)采用紫外光固化胶层204将扩散层201、核心层202及棱镜层203依次固化贴合，棱镜层203按照实际生产需要设置为一层或两层，制成复合增亮膜层；(3)采用OCA光学胶301将量子点膜层自第二阻隔层109侧与复合增亮膜层的扩散层201贴合，制成量子点复合增亮膜。
下面结合具体实施例，通过对制备的量子点复合增亮膜进行性能测试说明棱镜层203设置层数对量子点复合增亮膜性能的影响，其结果如表1所示。
实施例1
首先制备量子点膜层：量子点溶解于量子点稳定剂中，得到量子点溶液，量子点溶液与基质树脂107、散射粒子106、引发剂和稀释剂混合后，通过狭缝涂布，与上层具有PET层的第一阻隔层102和下层第二阻隔层109贴合，并在光照和加热的作用下，中间量子点层103发生固化，制成量子点膜层，随后可进行收卷成卷材；其次制备复合增亮膜层：将扩散层201、核心层202、棱镜层203通过紫外光固化胶(UV胶水)进行固化贴合，贴合时UV胶水的厚度为5-10μm，制成复合增亮膜，随后可收卷成卷材，本 实施例中，复合增亮膜只设置一层棱镜层203；最后，量子点膜层的第二阻隔层109通过OCA光学胶与复合增亮膜层的扩散层201进行贴合，制成量子点复合增亮膜，OCA光学胶在量子点膜层和复合增亮膜层之间形成OCA光学胶层301。
实施例2
实施例2与实施例1的区别在于：制备的复合增亮膜层在核心层202远离扩散层201侧设置有两层棱镜层203，两层棱镜层203之间采用UV胶水固化贴合，量子点复合增亮膜其他制备过程不变。
其中，实施例2相比于实施例1，增加了一层棱镜层后量子点复合增亮膜的亮度增加了5.3％。
表1 量子点复合增亮膜性能比较表
实施例 区别点 亮度(cd/m 2)
实施例1 一层棱镜层 4318
实施例2 两层棱镜层 4549
本发明公开的量子点复合增亮膜，将量子点复合增亮膜设置为多层结构，无需对量子点膜层进行多次涂布，通过将量子点膜减少一层基材层和调节各层结构的厚度，降低了量子点复合增亮膜的总厚度，有利于量子点复合增亮膜应用于背光模组的轻量化提高了产品性能的同时；本发明还通过减少量子点复合增亮膜制备过程中胶水固化的工艺次数，来减少膜片发生翘曲变形的，大大减少了制程不良；此外本发明的量子点复合增亮膜的制备方法，过程工艺简单，操作方便，可以大幅降低模组组装时间，大幅降低模组安装时间和膜片间的划伤、刮伤等。
以上对本发明实施例进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明仅用于帮助理解本发明的方法及其核心思想。同时，本领域技术人员依据本发明的思想，基于本发明的具体实施方式及应用范围上做出的改变或变形之处，都属于本发明保护的范围。综上所述，本说明书内容不应理解为对本发明的限制。

Claims (10)

  1. 一种量子点复合增亮膜，其特征在于，包括量子点膜层、复合增亮膜层和OCA光学胶层；
    所述量子点膜层包括依次贴合的背涂层、基材层、第一阻隔层、量子点层和第二阻隔层，所述第一阻隔层和第二阻隔层为水氧阻隔膜；
    所述复合增亮膜层包括依次贴合的扩散层、核心层和棱镜层；
    所述OCA光学胶层设置在量子点膜层和复合增亮膜层之间，OCA光学胶层一侧贴合连接于所述量子点膜层的第二阻隔层，相对侧贴合连接于所述复合增亮膜层的扩散层。
  2. 根据权利要求1所述的量子点复合增亮膜，其特征在于，所述量子点层为由基质树脂、量子点、量子点稳定剂、散射粒子、引发剂和稀释剂混合组成的胶水体系；
    所述基质树脂为有机硅树脂、环氧树脂、聚丙烯酰胺、聚氨酯、异氰酸酯、光固化树脂、热固化树脂的一种或多种；
    所述量子点为半导体材料构成的核壳结构，包括量子点中心核和外层壳；所述量子点中心核为散射粒子，所述外层壳为量子点纳米粒子；
    所述散射粒子为无机粒子和/或有机粒子，所述无机粒子为纳米二氧化硅、纳米二氧化钛、纳米二氧化钙、纳米二氧化锆中的一种或多种，所述有机粒子为有机硅类纳米粒子和/或丙烯酸类纳米粒子；
    所述量子点纳米粒子为MgS、CdTe、CdSe、CdS、CdZnS、ZnSe、ZnTe、ZnS、ZnO、GaAs、GaN、GaP、InP、InAs、InN、InSb、AlP、AlSb的一种或多种；
    所述量子点稳定剂为甲苯、正己烷、氯仿、丙烯酸异冰片酯的一种或多种；
    所述引发剂为光引发剂和/或热引发剂；
    所述稀释剂为甲苯、丙酮、丁酮、乙腈、乙醇、乙酸、乙酸乙酯、乙酸丁酯、正丁醚的一种或多种。
  3. 根据权利要求1所述的量子点复合增亮膜，其特征在于，所述量子点膜层中背涂层的厚度为5-10μm，基材层的厚度为45-115μm，量子点层的厚度为50-100μm。
  4. 根据权利要求1所述的量子点复合增亮膜，其特征在于，所述复合增亮膜层的扩散层、核心层及棱镜层之间采用紫外光固化胶固化贴合。
  5. 根据权利要求4所述的量子点复合增亮膜，其特征在于，所述紫外光固化胶的厚度为5-10μm。
  6. 根据权利要求1所述的量子点复合增亮膜，其特征在于，所述复合增亮膜层中扩散层用于修正光扩散角度，其厚度为50-100μm；
    所述核心层为3M增亮偏光膜，其厚度为20-50μm；
    所述棱镜层用于增加背光的回收，其厚度为50-200μm。
  7. 根据权利要求6所述的量子点复合增亮膜，其特征在于，所述的复合增亮膜层中包括两层采用紫外光固化胶贴合的棱镜层。
  8. 根据权利要求1所述的量子点复合增亮膜，其特征在于，所述背涂层进行表面粗糙处理。
  9. 一种量子点复合增亮膜的制备方法，其特征在于，包括如下步骤：
    (1)根据需要制备的量子点复合增亮膜的性能要求选定量子点并溶解于量子点稳定剂中，得到量子点溶液；所述量子点溶液与基质树脂、散射粒子、引发剂和稀释剂均匀混合后，通过狭缝涂布，分别与上层一侧贴合有基材层的第一阻隔层、下层第二阻隔层贴合，并在光照和加热的作用下，位于第一阻隔层、第二阻隔层之间的量子点层发生固化，制成量子点膜层；
    (2)采用紫外光固化胶将扩散层、核心层及棱镜层依次固化贴合，制成复合增亮膜层；
    (3)采用OCA光学胶将所述量子点膜层的第二阻隔层侧与所述复合 增亮膜层的扩散层贴合，制成量子点复合增亮膜。
  10. 根据权利要求9所述的量子点复合增亮膜的制备方法，其特征在于，所述复合增亮膜层的棱镜层设置为一层或两层，其中，两层所述棱镜层之间采用紫外光固化胶固化贴合。
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