阅读说明：本技术 一种量子点复合增亮膜及其制备方法 (Quantum dot composite brightness enhancement film and preparation method thereof ) 是由 刘勇 谢彬彬 于 2019-09-27 设计创作，主要内容包括：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。(The invention provides a quantum dot composite brightness enhancement film and a preparation method thereof, relating to the field of optical film films; the quantum dot composite brightness enhancement film comprises a quantum dot film layer, a composite brightness enhancement film layer and an OCA optical adhesive layer, wherein the quantum dot film layer is composed of a back coating layer, a base material layer, a first blocking layer, a quantum dot layer and a second blocking layer which are sequentially attached, the composite brightness enhancement film layer is composed of a diffusion layer, a core layer and a prism layer which are sequentially attached, and the OCA optical adhesive layer is connected with the second blocking layer and the diffusion layer; the quantum dot composite brightness enhancement film is provided with the multilayer film structure, the total thickness of the quantum dot composite brightness enhancement film is reduced by reducing one substrate layer, the application of the quantum dot composite brightness enhancement film to the light weight of a backlight module is facilitated, the operation of coating the quantum dot layer for multiple times is avoided, the poor processing procedure is reduced, and the performance of the quantum dot composite brightness enhancement film is effectively improved.)

1. The quantum dot composite brightness enhancement film is characterized by being of a multilayer structure and comprising a quantum dot film layer, a composite brightness enhancement film layer and an OCA optical adhesive layer;

the quantum dot film layer comprises a back coating, a substrate layer, a first barrier layer, a quantum dot layer and a second barrier layer which are sequentially attached, and the first barrier layer and the second barrier layer are water-oxygen barrier films;

the composite brightening film layer comprises a diffusion layer, a core layer and a prism layer which are sequentially attached;

OCA optical cement layer sets up between quantum dot rete and compound brightening rete, and the laminating of OCA optical cement layer one side is connected in the second separation layer contact of quantum dot rete, and the opposite side laminating is connected in the diffusion barrier of compound brightening rete.

2. The quantum dot composite brightness enhancing film of claim 1, wherein the quantum dot layer is a glue system consisting of a matrix resin, quantum dots, a quantum dot stabilizer, scattering particles, an initiator, and a diluent;

the matrix resin is one or more of organic silicon resin, epoxy resin, polyacrylamide, polyurethane, isocyanate, light-cured resin and heat-cured resin;

the quantum dots are of a core-shell structure formed by semiconductor materials and comprise a quantum dot central core and an outer shell; the central core of the quantum dot is scattering particles, and the outer shell of the quantum dot is quantum dot nano particles;

the scattering particles are inorganic particles and/or organic particles, the inorganic particles are one or more of nano silicon dioxide, nano titanium dioxide, nano calcium dioxide and nano zirconium dioxide, and the organic particles are organic silicon nanoparticles and/or acrylic nanoparticles;

the quantum dot nano particles are one or more of MgS, CdTe, CdSe, CdS, CdZnS, ZnSe, ZnTe, ZnS, ZnO, GaAs, GaN, GaP, InP, InAs, InN, InSb, AlP and 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, butanone, acetonitrile, ethanol, acetic acid, ethyl acetate, butyl acetate and n-butyl ether.

3. The quantum dot composite brightness enhancement film according to claim 1, wherein the thickness of the back coating layer in the quantum dot film layer is 5-10 μm, the thickness of the substrate layer is 45-115 μm, and the thickness of the quantum dot layer is 50-100 μm.

4. The quantum dot composite brightness enhancing film according to claim 1, wherein the diffusion layer, the core layer and the prism layer of the composite brightness enhancing film layer are cured and adhered by an ultraviolet light curing adhesive.

5. The quantum dot composite brightness enhancing film according to claim 4, wherein the UV-curable glue has a thickness of 5-10 μm.

6. The quantum dot composite brightness enhancing film according to claim 1, wherein the diffusion layer in the composite brightness enhancing film layer is used for correcting the light diffusion angle and has a thickness of 50-100 μm;

the core layer is a 3M brightening polarizing film, and the thickness of the core layer is 20-50 mu M;

the prism layer is used for increasing the recycling of the backlight and has the thickness of 50-200 mu m.

7. The quantum dot composite brightness enhancing film according to claim 6, wherein the composite brightness enhancing film layer comprises two prism layers bonded by UV-curable adhesive.

8. The preparation method of the quantum dot composite brightness enhancement film is characterized by comprising the following steps of:

(1) selecting quantum dots according to the performance requirements of the quantum dot composite brightness enhancement film to be prepared, and dissolving the quantum dots in a quantum dot stabilizer to obtain a quantum dot solution; after the quantum dot solution is uniformly mixed with matrix resin, scattering particles, an initiator and a diluent, the mixture is respectively attached to a first barrier layer and a second barrier layer of a lower layer, which are attached to a substrate layer on one side of an upper layer, through slit coating, and a quantum dot layer between the first barrier layer and the second barrier layer is solidified under the action of illumination and heating to prepare a quantum dot film layer;

(2) sequentially curing and laminating the diffusion layer, the core layer and the prism layer by adopting ultraviolet curing glue to prepare a composite brightening film layer;

(3) and attaching the quantum dot film layer to the diffusion layer of the composite brightness enhancement film layer from the second barrier layer side by adopting OCA optical cement to prepare the quantum dot composite brightness enhancement film.

9. The method as claimed in claim 8, wherein the prism layer of the composite brightness enhancement film layer is one or two layers, and the two prism layers are cured and laminated by UV curable adhesive.

Technical Field

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.

Background

Quantum Dots (QDs) are semiconductor nanocrystals whose band structure can be changed by adjusting the size of the Quantum Dots, and thus can emit light with different wavelengths when excited by a light source. The quantum dot film utilizes the characteristic that under the irradiation of blue backlight, red and green quantum dots in the quantum dot film are excited to emit red and green light rays, and the red and green light rays are mixed with unconverted blue light to form white light. Compared with the traditional LCD display, the LCD display using the quantum dot film only changes the blue backlight source, other structures are basically not changed, and the color gamut can be improved to more than 110% from 70% NTSC 1931.

Composite brightness enhancing films are multilayer optical films that are composited together. Compared with the traditional optical film, the composite brightness enhancement film has the advantages of lower thickness, lower cost, higher assembly efficiency and higher brightness, and the problems of scratch, scratch and the like caused by friction between the films are greatly reduced. The composite brightness enhancement film comprises two film structures, one is a composite film (COP) of a diffusion layer + a core layer + a prism layer, and the other is a multilayer composite film (COPP) of the diffusion layer + the core layer + the prism layer. Wherein, the core layers are all 3M core layers.

The quantum dot composite brightness enhancement film is formed by compounding a quantum dot film and a composite brightness enhancement film, and the wide color gamut effect of the quantum dot film and the diffusion and brightness enhancement effects of the composite brightness enhancement film can be organically combined in such a way. By using the composite film, the thickness of the whole module can be reduced, the installation difficulty of the module is simplified, and the subsequent ultrathin display product can be developed.

Disclosure of Invention

The invention aims to provide a quantum dot composite brightness enhancement film and a preparation method thereof, which are simple to operate, do not need to coat a quantum dot layer for multiple times, reduce poor processing procedures and improve the performance of the quantum dot composite brightness enhancement film.

In order to achieve the above purpose, the invention provides the following technical scheme: a quantum dot composite brightness enhancement film is a multilayer structure consisting of a quantum dot film layer, a composite brightness enhancement film layer and an OCA optical adhesive layer; the quantum dot film layer comprises a back coating, a substrate layer, a first barrier layer, a quantum dot layer and a second barrier layer which are sequentially attached, wherein the first barrier layer and the second barrier layer are water-oxygen barrier films; the composite brightening film layer comprises a diffusion layer, a core layer and a prism layer which are sequentially contacted; OCA optical cement layer sets up between quantum dot rete and compound brightening rete, and the laminating of OCA optical cement layer one side is connected in the second separation layer contact of quantum dot rete, and the opposite side laminating is connected in the diffusion barrier of compound brightening rete.

Furthermore, the quantum dot layer is a glue system formed by mixing matrix resin, quantum dots, a quantum dot stabilizer, scattering particles, an initiator and a diluent; the matrix resin is one or more of organic silicon resin, epoxy resin, polyacrylamide, polyurethane, isocyanate, light-cured resin and heat-cured resin; the quantum dots are of a core-shell structure formed by semiconductor materials and comprise a quantum dot central core and an outer shell; the central core of the quantum dot is scattering particles, and the outer shell of the quantum dot is quantum dot nano particles; the scattering particles are inorganic particles and/or organic particles, the inorganic particles are one or more of nano silicon dioxide, nano titanium dioxide, nano calcium dioxide and nano zirconium dioxide, and the organic particles are organic silicon nanoparticles and/or acrylic nanoparticles; the quantum dot nano particles are one or more of MgS, CdTe, CdSe, CdS, CdZnS, ZnSe, ZnTe, ZnS, ZnO, GaAs, GaN, GaP, InP, InAs, InN, InSb, AlP and 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, butanone, acetonitrile, ethanol, acetic acid, ethyl acetate, butyl acetate and n-butyl ether.

Based on the fact that quantum dots are easy to quench, a glue system formed by matrix resin and the quantum dots is adopted to package the quantum dots, and meanwhile, a water-oxygen barrier film is adopted as a barrier layer to further protect the glue system of the quantum dots, so that the quenching of the quantum dots is reduced.

Furthermore, the thickness of the back coating layer in the quantum dot film layer is 5-10 μm, the thickness of the base material layer is 45-115 μm, and the thickness of the quantum dot layer is 50-100 μm; on the premise of ensuring the optical performance of the quantum dot film layer, the light weight of the quantum dot composite brightness enhancement film is facilitated by adjusting the thicknesses of the back coating layer, the base material layer and the quantum dot layer.

Furthermore, the diffusion layer, the core layer and the prism layer of the composite brightness enhancement film layer are cured and attached by ultraviolet light curing glue, and the thickness of the ultraviolet light curing glue is 5-10 mu m.

Further, the diffusion layer is used for correcting the light diffusion angle, and the thickness of the diffusion layer is 50-100 μm; the core layer is a 3M brightening polarizing film, and the thickness of the core layer is 20-50 mu M; the prism layer is used for increasing the recycling of the backlight and has the thickness of 50-200 mu m.

Furthermore, the composite brightness enhancement film comprises two prism layers which are attached by ultraviolet curing glue, so that the dispersed light is concentrated to emit light within 70 degrees of the normal line as much as possible, and the brightness of the display is improved.

The invention also discloses a preparation method of the quantum dot composite brightness enhancement film, which comprises the following steps:

(1) dissolving quantum dots in a quantum dot stabilizer to obtain a quantum dot solution; after the quantum dot solution is mixed with matrix resin, scattering particles, an initiator and a diluent, the mixture is respectively attached to a first barrier layer and a second barrier layer of a lower layer, wherein one side of the upper layer is attached to a substrate layer, and the middle quantum dot layer is cured under the action of illumination and heating to prepare a quantum dot film layer;

(2) adopting ultraviolet curing glue to sequentially cure and attach the diffusion layer, the core layer and the prism layer, and arranging the prism layer into one layer or two layers according to actual production requirements to prepare a composite brightening film layer;

(3) and attaching the quantum dot film layer to the diffusion layer of the composite brightness enhancement film layer from the second barrier layer side by adopting OCA optical cement to prepare the quantum dot composite brightness enhancement film.

According to the technical scheme, the quantum dot composite brightness enhancement film and the preparation method thereof provided by the technical scheme of the invention have the following beneficial effects:

the invention discloses a quantum dot composite brightness enhancement film and a preparation method thereof, wherein the quantum dot composite brightness enhancement film is of a multilayer structure formed by sequentially laminating a quantum dot film layer, an OCA optical adhesive layer and a composite brightness enhancement film layer; the composite brightening film layer comprises a diffusion layer, a core layer and a prism layer which are sequentially contacted; the quantum dot composite brightness enhancement film adopts a multilayer film structure, reduces the number of the quantum dot films by one substrate layer, reduces the total thickness of the quantum dot composite brightness enhancement film, and is beneficial to the application of the quantum dot composite brightness enhancement film to the light weight of a backlight module. The quantum dot layer is a glue system composed of matrix resin and is directly coated between a first barrier layer and a second barrier layer composed of a water-oxygen barrier film, quenching of quantum dots is reduced, the quantum dot layer is protected, the operation that multiple times of coating is required on the same quantum dot layer is directly avoided, the possibility of warping deformation of the diaphragm is reduced, poor manufacturing process is reduced, the performance of the quantum dot composite brightness enhancement film is improved, the mounting time of a module is shortened, scratches and the like between the diaphragms are reduced; and the quantum dot film layer is directly cured under illumination and heating conditions, the process is simple, and the operation is convenient.

In addition, choose OCA optical cement layer to connect quantum dot rete and compound brightening rete, the scheme that at least one deck prism layer set up the outside of keeping away from the back coating in the quantum dot rete, and the light-emitting is concentrated at 70 within ranges of normal to as much as possible with dispersed light, improves the luminance of this quantum dot compound brightening membrane display behind being used for the display by a wide margin.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a quantum dot film according to the present invention;

FIG. 2 is a schematic view of a composite brightness enhancement film according to the present invention;

FIG. 3 is a schematic view of a quantum dot composite brightness enhancement film according to the present invention.

In the figure, the specific meaning of each mark is:

101-a substrate layer, 102-a first barrier layer, 103-a quantum dot layer, 104-a green quantum dot, 105-a red quantum dot, 106-a scattering particle, 107-a matrix resin, 108-a back coating layer, 109-a second barrier layer, 201-a diffusion layer, 202-a core layer, 203-a prism layer, 204-an ultraviolet light curing glue layer, 301-an OCA optical glue layer.

Detailed Description

In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not intended to include all aspects of the present invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.

Based on the prior art, when the multifunctional quantum dot film is prepared, the general technological process is complicated, and multiple coating and multiple glue curing are usually required to be carried out on the same layer of quantum dot film, so that the poor processing procedure is greatly increased, and the production yield of the film layer is reduced; the invention aims to provide 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 into a multilayer structure, and a quantum dot layer 103 forming a glue system is coated between a first barrier layer 102 and a second barrier layer 109, so that the phenomenon that multiple coating and multiple glue curing are carried out on the same quantum dot film is directly avoided, and the poor processing procedure is reduced; meanwhile, when the quantum dot film and the composite brightness enhancement film are assembled in a laminating mode, the light weight is achieved by adjusting the thickness of each film layer and reducing one substrate layer 101.

The quantum dot composite brightness enhancement film and the preparation method thereof according to the present invention will be further described in detail with reference to the embodiments shown in the drawings.

Referring to fig. 3, a quantum dot composite brightness enhancement film is provided as a multilayer structure composed of a quantum dot film layer, a composite brightness enhancement film layer, and an OCA optical adhesive layer 301; the quantum dot film layer comprises a back coating layer 108, a substrate layer 101, a first barrier layer 102, a quantum dot layer 103 and a second barrier layer 109 which are sequentially attached, wherein the first barrier layer 102 and the second barrier layer 109 are water-oxygen barrier films; the composite brightness enhancement film layer comprises a diffusion layer 201, a core layer 202 and a prism layer 203 which are sequentially contacted; OCA optical cement layer 301 sets up between quantum dot rete and compound brightening rete, and the laminating of OCA optical cement layer 301 one side is connected in the contact of the second barrier layer 109 on quantum dot rete, and the opposite side laminating is connected in the diffusion layer 201 on compound brightening rete.

Referring to fig. 1, the quantum dot layer 103 is a glue system formed by mixing a matrix resin 107, quantum dots, a quantum dot stabilizer, scattering particles 106, an initiator and a diluent, the quantum dots include green quantum dots 104 and red quantum dots 105, and the matrix resin 107 and the quantum dots form the glue system to encapsulate the quantum dots, so that the quantum dots can be encapsulated and protected at one time, and quenching of the quantum dots is reduced.

In an embodiment, the quantum dot is a core-shell structure composed of a semiconductor material, and comprises a quantum dot central core and an outer shell; the material of the quantum dots is one or more of MgS, CdTe, CdSe, CdS, CdZnS, ZnSe, ZnTe, ZnS, ZnO, GaAs, GaN, GaP, InP, InAs, InN, InSb, AlP and AlSb, for example, the central core is a CdSe core, and the shell is a ZnS shell. Because of the size difference of quantum dots, the size is generally 2-10nm, the emission light wavelength of the quantum dots varies with the particle size and the composition, and generally, the green quantum dots 104 and the red quantum dots 105 are included, the particle size of the green quantum dots 104 is smaller, and the particle size of the red quantum dots 105 is larger. In a specific implementation, the scattering particles 106 may be inorganic particles and/or organic particles, the inorganic particles are generally one or more of nano silicon dioxide, nano titanium dioxide, nano calcium dioxide and nano zirconium dioxide, and the organic particles are silicone nanoparticles and/or acrylic nanoparticles.

In order to form a glue system for encapsulating quantum dots, the matrix resin 107 can be one or more of organic silicon resin, epoxy resin, polyacrylamide, polyurethane, isocyanate, light-cured resin and thermosetting resin, 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, and the diluent is one or more of toluene, acetone, butanone, acetonitrile, ethanol, acetic acid, ethyl acetate, butyl acetate and n-butyl ether.

Meanwhile, the first barrier layer 102 and the second barrier layer 109 adopt the water-oxygen barrier film, so that a glue system of the quantum dot layer 103 can be further protected, quenching of quantum dots is reduced, and the performance of the quantum dot film is improved.

As shown in fig. 2, the diffuser layer 201, the core layer 202 and the prism layer 203 of the composite brightness enhancement film layer are cured and bonded by using an ultraviolet curing adhesive 204, and in order to improve the brightness enhancement effect of the quantum dot composite brightness enhancement film, one or two prism layers 203 may be disposed and bonded in the composite brightness enhancement film layer, and the two prism layers 203 are connected and fixed by using the ultraviolet curing adhesive 204, and generally, during the specific operation, the thickness of the ultraviolet curing adhesive is 5-10 μm; the prism layer 203 is arranged on one side far away from the quantum dot film layer, so that scattered light is concentrated to emit light within the range of 70 degrees of the normal line as much as possible, the recycling of backlight is increased, and the brightness of the quantum dot composite brightness enhancement film applied to a display is greatly improved.

Further referring to fig. 1 and 2, in order to improve the light weight of the quantum dot composite brightness enhancement film during application and the performance and quality of the product, the back coating 108 in the quantum dot film layer is subjected to surface roughening treatment to avoid scratching and scratching the quantum dot film layer, and the thickness is 5-10 μm; the material of the substrate layer 101 is PET (polyethylene terephthalate), and the thickness is 45-115 μm; the thickness of the quantum dot layer 103 glue system is 50-100 μm; the diffusion layer 201 in the composite brightness enhancement layer is used for correcting the light diffusion angle and covering the defects of the light guide plate, so that the radiation area of the backlight source is larger, the uniformity is better, and the thickness of the backlight source is 50-100 mu m; the core layer 202 is a 3M brightening polarizing film with the thickness of 20-50 μ M; the prism layer 203 is used for increasing the recovery of backlight, so that the dispersed light is reflected back to be utilized again, the axial center brightness is increased by more than 110%, and the thickness of the prism layer is 50-200 μm. On the premise of ensuring the optical performance of the quantum dot film layer, the light weight and performance adjustment of the quantum dot composite brightness enhancement film are facilitated by adjusting the thicknesses of the structures, namely the thicknesses of the back coating layer 108, the base material layer 101, the quantum dot layer 103, the diffusion layer 201, the core layer 202 and the prism layer 103.

In order to solve the technical problems of complicated preparation process, poor manufacturing process and low production yield of the quantum dot film layer, the invention also discloses a preparation method of the quantum dot composite brightness enhancement film, which is simple and convenient to operate and simple in process, and the preparation method specifically comprises the following steps:

(1) dissolving quantum dots in a quantum dot stabilizer to obtain a quantum dot solution; after the quantum dot solution is mixed with matrix resin 107, scattering particles 106, an initiator and a diluent, the mixture is respectively attached to a first barrier layer 102 and a second barrier layer 109 which are respectively attached to a substrate layer 101 on one side of an upper layer and a lower layer through slit coating, and under the action of illumination and heat, a middle quantum dot layer 103 is cured to form a quantum dot film layer; (2) adopting an ultraviolet curing glue layer 204 to sequentially cure and attach the diffusion layer 201, the core layer 202 and the prism layer 203, and arranging the prism layer 203 into one layer or two layers according to actual production requirements to prepare a composite brightening film layer; (3) and attaching the quantum dot film layer to the diffusion layer 201 of the composite brightness enhancement film layer from the second barrier layer 109 side by using OCA (optically clear adhesive) 301 to prepare the quantum dot composite brightness enhancement film.

The following description, with reference to specific examples, illustrates the effect of the number of layers of the prism layer 203 on the performance of the quantum dot composite brightness enhancement film through performance tests of the prepared quantum dot composite brightness enhancement film, and the results are shown in table 1.