WO2020258485A1 - 量子点偏光片结构及液晶显示器 - Google Patents

量子点偏光片结构及液晶显示器 Download PDF

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Publication number
WO2020258485A1
WO2020258485A1 PCT/CN2019/102553 CN2019102553W WO2020258485A1 WO 2020258485 A1 WO2020258485 A1 WO 2020258485A1 CN 2019102553 W CN2019102553 W CN 2019102553W WO 2020258485 A1 WO2020258485 A1 WO 2020258485A1
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Prior art keywords
quantum dot
light
layer
blue
polarizer structure
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PCT/CN2019/102553
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English (en)
French (fr)
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周淼
常建宇
丘永元
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深圳市华星光电技术有限公司
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Publication of WO2020258485A1 publication Critical patent/WO2020258485A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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

Definitions

  • the present invention relates to the technical field of liquid crystal display, in particular to a quantum dot polarizer structure and a liquid crystal display.
  • the existing quantum film technology is to replace the white light lamp of the backlight source with a blue light, and by converting a point light source into a surface light source to excite the quantum dot film to emit light, but often the quantum dot film is directly combined with the backlight or polarizer, etc.
  • the problem of brightness reduction appears. Through targeted research, it is found that it is not because the fluorescence quantum yield efficiency of quantum dots is low, but because the simple quantum dot polarizer structure does not have a high utilization rate of excitation light, and the quantum dot light-emitting layer is excited multiple times (QD Layer) can effectively improve its brightness.
  • An object of the present invention is to provide a quantum dot polarizer structure, which can reflect part of the blue light back to the quantum dot light-emitting layer to achieve the purpose of exciting the quantum dot light-emitting layer multiple times and improving the brightness of the film.
  • a quantum dot polarizer structure comprising a protective layer, a quantum dot light-emitting layer located on the protective layer, a blue reflective layer located on the quantum dot light-emitting layer, a polarizing layer located on the blue reflective layer, the blue reflective layer It is used to reflect part of the blue light in the blue light emitted by the quantum dot light-emitting layer back to the quantum dot light-emitting layer, and then stimulate the quantum dot light-emitting layer to emit light again.
  • the blue reflective layer includes a diaphragm material with a blue reflectivity of 30% to 90%.
  • the blue reflection layer selectively reflects light with a wavelength between 400 nm and 480 nm, and reflects part of the blue light back to the quantum dot light-emitting layer. The reflected blue light is used to excite the quantum dot light-emitting layer to emit light, which improves the utilization rate of light.
  • the quantum dot light-emitting layer is polymerized into a film by a thermal curing or UV curing method to form a film on the protective layer.
  • the quantum dot light-emitting layer includes a medium and quantum dots and red and green pixels (R/G) arranged in the medium, and the medium includes transparent resin, TAC (Triacetyl Cellulose), Any of COP (Cycloolefin Polymer).
  • the quantum dot includes a light-emitting core and an inorganic protective shell layer
  • the light-emitting core includes a green light material, a red light material
  • the green light material is selected from one of ZnCdSe 2 , InP, Cd 2 SSe or Two or more
  • the red light material is selected from one or more of CdSe, Cd 2 SeTe, InAs
  • the inorganic protective shell layer includes one or two of CdS, ZnSe, ZnCdS 2 , ZnS, and ZnO The above materials.
  • the quantum dots include any one of a hydrogel loaded quantum dot structure, a CdSe-SiO 2 structure, or a perovskite quantum dot.
  • the material of the protective layer includes any one of PET (Polyethylene terephthalate), TAC, and COP.
  • Another object of the present invention is to provide a liquid crystal display including the above quantum dot polarizer structure.
  • the liquid crystal display further includes a light source located on the light incident side of the quantum dot polarizer structure, and light emitted by the light source enters the quantum dot polarizer structure and excites the quantum dots to emit light;
  • the light emitted by the light source is blue light and the blue light excites the quantum dot medium layer to emit white light.
  • the present invention introduces a blue reflective layer with wavelength selectivity between the quantum dot light-emitting layer and the polarizing layer to reflect part of the blue light to the quantum dots and re-excite the quantum dots to emit light, and so on. , Improve the utilization rate of light, can improve the display brightness of the diaphragm.
  • FIG. 1 is a cross-sectional view of the structure of a quantum dot polarizer according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the blue light reflecting part of the quantum dot polarizer structure of an embodiment of the present invention
  • Fig. 3 is a cross-sectional view of a liquid crystal display according to an embodiment of the present invention.
  • a novel quantum dot polarizer structure 100 which includes a protective layer 1, a quantum dot light-emitting layer 2 located on the protective layer 1, and a quantum dot
  • the blue reflective layer 3 on the point light emitting layer 2 and the polarizing layer 4 on the blue reflective layer 3 are used to reflect part of the blue light in the blue light emitted by the quantum dot light emitting layer 2 back to the place
  • the quantum dot light-emitting layer 2 further excites the quantum dot light-emitting layer 2 to emit light again.
  • the blue reflection layer 3 includes a diaphragm material with a blue reflectivity of 30% to 90%.
  • the blue reflective layer 3 selectively reflects light with a wavelength between 400 nm and 480 nm, and reflects part of the blue light back to the quantum dot light-emitting layer 2.
  • the reflected blue light is used to excite the quantum dot light-emitting layer 2 to emit light, which improves the utilization rate of light.
  • the quantum dot light-emitting layer 2 is polymerized into a film by a thermal curing or UV curing method and formed on the protective layer.
  • the quantum dot light-emitting layer 2 includes a medium 21, quantum dots 22 and red and green pixels 23 (R/G) arranged in the medium 21, and the medium 21 includes transparent resin, TAC (Triacetyl cellulose, Triacetyl Cellulose), COP (Cyclic Olefin Polymer).
  • TAC Triacetyl cellulose, Triacetyl Cellulose
  • COP Cyclic Olefin Polymer
  • the quantum dot 22 includes a light-emitting core and an inorganic protective shell layer
  • the light-emitting core includes a green light material, a red light material
  • the green light material is selected from one or two of ZnCdSe 2 , InP, and Cd 2 SSe
  • the red light material is selected from one or more of CdSe, Cd 2 SeTe, InAs
  • the inorganic protective shell layer includes one or more of CdS, ZnSe, ZnCdS 2 , ZnS, and ZnO material.
  • the quantum dot 22 includes any one of a hydrogel loaded quantum dot structure, a CdSe-SiO 2 structure, or a perovskite quantum dot.
  • the material of the protective layer 1 includes any one of PET (Polyethylene terephthalate), TAC, and COP, which acts as a barrier against water and oxygen.
  • another object of the present invention is to provide a liquid crystal display including the aforementioned quantum dot polarizer structure 100.
  • the liquid crystal display of the present invention includes a reflective sheet 10, a light guide plate 20, a first diffusion sheet 30, a prism sheet 40, a second diffusion sheet 50, a quantum dot polarizer structure 100, and a liquid crystal panel 60 from bottom to top.
  • the quantum dot polarizer structure 100 includes a protective layer 1, a quantum dot light-emitting layer 2, a blue reflective layer 3, and a polarizing layer 4 from bottom to top.
  • the liquid crystal display of the present invention further includes a light source 70 located on the light incident side of the quantum dot polarizer structure 100.
  • the light source 70 is disposed opposite to the light guide plate 20, and the light source is located on a side of the light guide plate 20.
  • the light emitted by the light source 70 enters the quantum dot polarizer structure 100 and excites the quantum dots 22 to emit light; the light emitted by the light source 70 is blue light and the blue light excites the quantum dot medium layer 2 to emit light White light.
  • the present invention introduces a blue reflective layer 3 with wavelength selectivity between the quantum dot light-emitting layer 2 and the polarizing layer 4 to reflect part of the blue light to the quantum dot 22 and re-excite the quantum dot to emit light.
  • the layer 2 emits light, which cyclically reciprocates, which improves the utilization rate of light and can increase the display brightness of the diaphragm.

Abstract

一种量子点偏光片结构及液晶显示器。量子点偏光片结构（100）包括保护层（1）、位于保护层（1）之上的量子点发光层（2）、位于量子点发光层（2）之上的蓝光反射层（3）、位于蓝光反射层（3）之上的偏光层（4）。液晶显示器包括量子点偏光片结构（100）。

Description

量子点偏光片结构及液晶显示器 技术领域
本发明涉及液晶显示技术领域，特别涉及一种量子点偏光片结构及液晶显示器。
 背景技术
现有量子膜技术，是通过将背光源的白光灯更换成蓝灯，通过将点光源转化成面光源后激发量子点膜发光，但是往往量子点膜直接与背光或偏光片等复合，均会出现亮度降低的问题，通过针对性研究发现并不是因为量子点的荧光量子产率效低，而是因为简单的量子点偏光片结构对激发光的利用率不高，多次激发量子点发光层（QD Layer）可以有效提高其亮度。
因此，确有必要来开发一种新型的量子点偏光片结构，来克服现有技术中的缺陷。
 技术问题
本发明的一个目的是提供一种量子点偏光片结构，其能将部分蓝光反射回量子点发光层，达到多次激发量子点发光层，提高膜片亮度的目的。
 技术解决方案
为了实现上述目的，本发明采用了如下的技术方案：
一种量子点偏光片结构，包括保护层、位于保护层之上的量子点发光层、位于量子点发光层之上的蓝光反射层、位于蓝光反射层之上的偏光层，所述蓝光反射层用于将所述量子点发光层发出的蓝光中的部分蓝光反射回所述量子点发光层，进而再一次的激发所述量子点发光层发光。
进一步的，其中所述蓝光反射层包括蓝光反射率为30~90 %的膜片材料。进一步的，其中所述蓝光反射层选择性的反射波长处于400~480nm之间的光线，将部分蓝光反射回量子点发光层。利用反射的蓝光激发量子点发光层发光，提高了对光的利用率。
进一步的，其中所述量子点发光层通过热固化或UV固化的方法聚合成膜形成在所述保护层上。
进一步的，其中所述量子点发光层包括介质和设置在所述介质内的量子点和红绿像素（R/G），所述介质包括透明树脂、TAC（三醋酸纤维素，Triacetyl Cellulose）、COP（环烯烃聚合物）中的任一种。
进一步的，其中所述量子点包括发光核、无机保护壳层，所述发光核包括绿光材料、红光材料，所述绿光材料选自ZnCdSe 2、InP、Cd 2SSe中的一种或两种以上，所述红光材料选自CdSe、Cd 2SeTe、InAs中的一种或两种以上，所述无机保护壳层包括CdS、ZnSe、ZnCdS 2、ZnS、ZnO中的一种或两种以上材料。
进一步的，其中所述量子点包括水凝胶装载量子点结构、CdSe-SiO 2结构或钙钛矿量子点中的任一种。
进一步的，其中所述保护层的材料包括PET（聚对苯二甲酸乙二醇酯，Polyethylene terephthalate）、TAC、COP的任一种。
本发明的又一个目的是提供一种液晶显示器，包括上述量子点偏光片结构。
进一步的，其中所述的液晶显示器还包括一光源，位于所述量子点偏光片结构的入光侧，所述光源发出的光线射入所述量子点偏光片结构并激发所述量子点发光；所述光源发出的光为蓝光且所述蓝光激发所述量子点介质层发白光。
 有益效果
区别于现有技术的情况，本发明通过在量子点发光层与偏光层之间引入一层具有波长选择性的蓝光反射层，将部分蓝光反射至量子点并再次激发量子点发光，如此循环往复，提高了光的利用率，可以提高膜片的显示亮度。
 附图说明
图1 是本发明一种实施方式的量子点偏光片结构的截面图；
图2 是本发明一种实施方式的量子点偏光片结构的反射部分蓝光示意图；
图3 是本发明一种实施方式的液晶显示器的截面图。
图中部件标识如下：
1保护层、2量子点发光层、3蓝光反射层、4偏光层；
21介质、 22量子点、23红绿像素；
10反射片、20导光板、30第一扩散片、40棱镜片、
50第二扩散片、60液晶面板、70光源；
100量子点偏光片结构。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是用以相同标号表示。
请参阅图1、图2所示，根据本发明的一实施例提供了一种新型的量子点偏光片结构100，包括保护层1、位于保护层1之上的量子点发光层2、位于量子点发光层2之上的蓝光反射层3、位于蓝光反射层3之上的偏光层4，所述蓝光反射层3用于将所述量子点发光层2发出的蓝光中的部分蓝光反射回所述量子点发光层2，进而再一次的激发所述量子点发光层2发光。
其中所述蓝光反射层3包括蓝光反射率为30 %~90 %的膜片材料。
其中所述蓝光反射层3选择性的反射波长处于400nm~480nm之间的光线，将部分蓝光反射回量子点发光层2。利用反射的蓝光激发量子点发光层2发光，提高了对光的利用率。
其中所述量子点发光层2通过热固化或UV固化的方法聚合成膜形成在所述保护层上。
其中所述量子点发光层2包括介质21和设置在所述介质21内的量子点22和红绿像素23（R/G），所述介质21包括透明树脂、TAC（三醋酸纤维素，Triacetyl Cellulose）、COP（环烯烃聚合物）中的任一种。
其中所述量子点22包括发光核、无机保护壳层，所述发光核包括绿光材料、红光材料，所述绿光材料选自ZnCdSe 2、InP、Cd 2SSe中的一种或两种以上，所述红光材料选自CdSe、Cd 2SeTe、InAs中的一种或两种以上，所述无机保护壳层包括CdS、ZnSe、ZnCdS 2、ZnS、ZnO中的一种或两种以上材料。
其中所述量子点22包括水凝胶装载量子点结构、CdSe-SiO 2结构或钙钛矿量子点中的任一种。
其中所述保护层1的材料包括PET（聚对苯二甲酸乙二醇酯，Polyethylene terephthalate）、TAC、COP的任一种，起阻隔水氧的作用。
请参阅图3所示，本发明的又一个目的是提供一种液晶显示器，包括上述量子点偏光片结构100。本发明液晶显示器从下至上依次包括反射片10、导光板20、第一扩散片30、棱镜片40、第二扩散片50、量子点偏光片结构100及液晶面板60，其中量子点偏光片结构100从下至上依次包括保护层1、量子点发光层2、蓝光反射层3、偏光层4。
其中，本发明液晶显示器还包括一光源70，位于所述量子点偏光片结构100的入光侧，具体地讲，所述光源70与导光板20相对设置，所述光源位于导光板20的一侧，所述光源70发出的光线射入所述量子点偏光片结构100并激发所述量子点22发光；所述光源70发出的光为蓝光且所述蓝光激发所述量子点介质层2发白光。
区别于现有技术的情况，本发明通过在量子点发光层2与偏光层4之间引入一层具有波长选择性的蓝光反射层3，将部分蓝光反射至量子点22并再次激发量子点发光层2发光，如此循环往复，提高了光的利用率，可以提高膜片的显示亮度。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (10)

  1. 一种新型的量子点偏光片结构，其包括：
    一保护层；
    一量子点发光层，位于保护层之上；
    一蓝光反射层，位于量子点发光层之上，用于将部分蓝光反射回量子点发光层；
    一偏光层，位于蓝光反射层之上。
  2. 根据权利要求1 所述的量子点偏光片结构，其中，所述蓝光反射层包括蓝光反射率为30~90 %的膜片材料。
  3. 根据权利要求1 所述的量子点偏光片结构，其中，所述蓝光反射层选择性的反射波长处于400~480nm之间的光线，将部分蓝光反射回量子点发光层。
  4. 根据权利要求1 所述的量子点偏光片结构，其中，所述量子点发光层通过热固化或UV固化的方法聚合成膜形成在所述保护层上。
  5. 根据权利要求1 所述的量子点偏光片结构，其中，所述量子点发光层包括介质和设置在所述介质内的量子点和红绿像素，所述介质包括透明树脂、TAC、COP或具有红绿双波长发射的量子点材料中的任一种。
  6. 根据权利要求5 所述的量子点偏光片结构，其中，所述量子点包括发光核、无机保护壳层，所述发光核包括绿光材料、红光材料，所述绿光材料选自ZnCdSe 2、InP、Cd 2SSe中的一种或两种以上，所述红光材料选自CdSe、Cd 2SeTe、InAs中的一种或两种以上，所述无机保护壳层包括CdS、ZnSe、ZnCdS 2、ZnS、ZnO中的一种或两种以上材料。
  7. 根据权利要求5 所述的量子点偏光片结构，其中，所述量子点包括水凝胶装载量子点结构、CdSe-SiO 2结构或钙钛矿量子点中的任一种。
  8. 根据权利要求1所述的量子点偏光片结构，其中，所述保护层的材料包括PET、TAC、COP的任一种。
  9. 一种液晶显示器，其中，所述液晶显示器包括如权利要求1所述的量子点偏光片结构。
  10. 根据权利要求8所述的液晶显示器，其还包括
    一光源，位于所述量子点偏光片结构的入光侧，所述光源发出的光线射入所述量子点偏光片结构并激发所述量子点发光；所述光源发出的光为蓝光且所述蓝光激发所述量子点介质层发白光。
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