WO2018166182A1 - 偏光片及显示装置 - Google Patents

偏光片及显示装置 Download PDF

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Publication number
WO2018166182A1
WO2018166182A1 PCT/CN2017/104561 CN2017104561W WO2018166182A1 WO 2018166182 A1 WO2018166182 A1 WO 2018166182A1 CN 2017104561 W CN2017104561 W CN 2017104561W WO 2018166182 A1 WO2018166182 A1 WO 2018166182A1
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WO
WIPO (PCT)
Prior art keywords
light
polarizer
particle layer
strip
film
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PCT/CN2017/104561
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English (en)
French (fr)
Inventor
曾世彪
韩小东
李建河
张琦
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/776,046 priority Critical patent/US10983384B2/en
Publication of WO2018166182A1 publication Critical patent/WO2018166182A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G02F1/133507—Films for enhancing the luminance
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a polarizer and a display device.
  • the liquid crystal display panel is composed of two opposite substrates and a liquid crystal layer encapsulated between the two substrates.
  • the display light emitted from the liquid crystal display panel needs to pass through a multi-layer structure, so that the uniformity of the emitted light is low.
  • the backlight module that provides backlighting includes a multilayer optical film that is stacked to provide uniform light uniformity.
  • embodiments of the present disclosure provide a polarizer and a display device, which can improve the uniformity of light transmitted through the polarizer.
  • a polarizer comprising a homogenous light structure; the homogenous light structure comprising a layer of light diffusing particles for improving uniformity of light passing through the polarizer.
  • the polarizer further includes a polarizer base layer and a pressure sensitive adhesive layer respectively disposed on two sides of the light homogenizing structure.
  • the light-homogenizing structure further includes a first permeable film; the first permeable film is away from the The surface of the light-diffusing particle layer has a plurality of strip-shaped protrusions arranged in parallel, and each of the plurality of strip-shaped protrusions has a triangular shape in a cross-sectional shape perpendicular to the direction in which the self extends; wherein the first transmission The film is disposed on a side of the light diffusion particle layer adjacent to the polarizer substrate layer, or the first permeable film is disposed on a side of the light diffusion particle layer adjacent to the pressure sensitive adhesive layer.
  • the diffusing particles in the light diffusing particle layer are spherical in shape.
  • the light diffusion is approximately 1 to 20 ⁇ m.
  • the material of the diffusion particles in the light diffusion particle layer is polystyrene resin, polymethyl methacrylate, polycarbonate, and dioxide At least one of silicon.
  • the body of the light diffusing particle layer is a transparent film layer.
  • the height of the ribs of the strip-shaped protrusions is approximately 35 ⁇ m ⁇ the ridge height ⁇ 45 ⁇ m.
  • the two sides of the strip-shaped protrusions form an apex angle range of approximately 115° ⁇ The apex angle is ⁇ 125°.
  • the light homogenizing structure further includes: the light diffusing particle layer is disposed away from the first permeable film The second permeable membrane on one side.
  • the material of the first permeable membrane and/or the second permeable membrane is polyparaphenylene Ethylene glycol dicarboxylate.
  • the polarizer base layer includes a first triacetylcellulose film sequentially away from the homogenous light structure a polyvinyl alcohol film and a second cellulose triacetate film.
  • the polarizer further includes: bonding the pressure sensitive adhesive layer away from the light homogenizing structure a release film on one side; and/or a protective film attached to the surface of the base layer of the polarizer.
  • a display device comprising a display panel, the display device further comprising the polarizer disposed at at least one of two sides of the display panel.
  • the polarizer is disposed on a side close to a display side of the display panel; the light homogenizing structure further includes a first permeable film disposed on the light diffusing particle layer away from the display side; a surface of the first permeable membrane remote from the light diffusion particle layer having a plurality of strip-shaped protrusions arranged in parallel; wherein each of the plurality of strip-shaped protrusions has a cross-sectional shape perpendicular to a direction in which the self extends a triangular shape; or the polarizer is disposed on a side facing away from the display side of the display panel; the light homogenizing structure further includes a first portion disposed on a side of the light diffusion particle layer adjacent to the display panel a permeable membrane; the first permeable membrane has a plurality of strip-shaped protrusions arranged in parallel away from the surface of the light-diffusing particle layer; wherein each of the plurality of strip-shaped protrusions is perpendicular to itself The cross-
  • FIG. 1 is a schematic cross-sectional structural view of a polarizer according to an embodiment of the present disclosure
  • FIG. 2 is a schematic cross-sectional view of a polarizer according to an embodiment of the present disclosure
  • FIG. 3 is a schematic cross-sectional structural view 3 of a polarizer according to an embodiment of the present disclosure
  • FIG. 4 is a schematic cross-sectional view of a polarizer according to an embodiment of the present disclosure
  • FIG 5 is a front view direction (part (a) in the figure) and a cross-sectional direction (in the figure (b) in the prior art in the display side of the display panel or on the attaching surface of the polarizer when the light is scratched through the scratch; a schematic diagram of part);
  • Figure 6 is a schematic view of the light rays passing through the scratched area of Figure 5;
  • FIG. 7 is a schematic cross-sectional structural view of a strip-shaped protrusion in a polarizer according to an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides a polarizer that includes a light homogenizing structure 10 .
  • the light homogenizing structure 10 includes a light diffusing particle layer 11 for improving uniformity of light passing through the polarizer. .
  • a plurality of diffusing particles 110 are dispersed in the light-diffusing particle layer 11, and the direction of the transmitted light can be corrected to make the light transmitted through the polarizer more uniform.
  • particle in the embodiments of the present disclosure refers to a geometry having a characteristic shape within a certain size range.
  • the certain dimensions mentioned here are usually between the order of nanometers and millimeters. Therefore, the above-mentioned diffusion particles refer to particles having a smaller order of magnitude, and the microscopic specific shape is not limited to a spherical shape, and may be specifically defined in various shapes.
  • the dispersing state of the diffusing particles 110 in the light diffusing particle layer 11 is shown in FIG. 1 .
  • the size of the diffusing particles 110 may be the same or different, which is not limited in the embodiment of the present disclosure.
  • Polarizer also known as polarizer. It is an optical film which is composed of a multi-layered polymer material and has a function of generating polarized light.
  • the utility model is applied to a liquid crystal display panel, which can convert natural light which is not polarized into polarized light, and allows light which is perpendicular to the electric field to pass, so that the liquid crystal display panel can display images normally.
  • the polarizer is one of the key components that affect the display effect of the liquid crystal display panel.
  • the above-mentioned polarizer provided by the embodiment of the present disclosure has a light-homogenizing structure 10 including a light-diffusing particle layer 11 in which diffusing particles 110 are dispersed, and the diffusing particles 110 increase the degree of contact with light (see FIG. 1).
  • the direction of the light is corrected to correct the direction of the light, so that the light transmitted through the polarizer is more uniform.
  • the uniformity of the display light emitted from the display panel can be improved, and the display quality can be improved; when the polarizer is specifically disposed on the liquid crystal display panel near the backlight When one side of the module is used as the lower polarizer, the uniformity of the backlight light emitted from the backlight module can be improved, and the display quality can be improved.
  • the main body of the light-diffusing particle layer 11 is a transparent film layer, and the material thereof may specifically be a transparent film layer commonly used in optical films such as PET (collectively called polyethylene terephthalate).
  • the diffusion particles 110 are fixed.
  • the material of the diffusion particles 110 may be polystyrene resin (also known as styrene resin, ie, PS styrene, abbreviated as PS), polymethyl methacrylate (also known as acrylic resin, ie, polymethyl methacrylate, abbreviation) It is at least one of PMMA), polycarbonate (ie, Polycarbonate, abbreviated as PC), and silica (SiO 2 ).
  • PS polystyrene resin
  • polymethyl methacrylate also known as acrylic resin, ie, polymethyl methacrylate, abbreviation
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • SiO 2 silica
  • the shape of the diffusion particles 110 may be spherical to increase the contact area corrected for the light. Its particle diameter (i.e., diameter) may be about 1 to 20 ⁇ m. In one embodiment, the particle size is 1 ⁇ m. In another embodiment, the particle size is 10 ⁇ m. In another embodiment, the particle size is 20 ⁇ m.
  • the polarizer provided by the embodiment of the present disclosure further includes a polarizer base layer 20 and a pressure sensitive adhesive layer 30 respectively disposed on both sides of the uniform light structure 10.
  • the light-homogenizing structure 10 further includes a first permeable film 12; the surface 12a of the first permeable film 12 away from the light-diffusing particle layer 10 has a plurality of strip-shaped protrusions 120 arranged in parallel. And each of the plurality of strip-shaped protrusions 120 has a triangular shape in a cross-sectional shape perpendicular to the direction in which the self extends.
  • the overall shape of the polarizer is generally rectangular, and the extending direction of the strip protrusions 120 may extend in any one of the side directions of the rectangle. That is, when the surface direction of the polarizer is a paper surface, the extending direction of the strip-shaped protrusions 120 may be a horizontal direction or a vertical direction, which is not limited.
  • the strip-shaped protrusions 120 have a triangular shape in a cross-sectional shape perpendicular to the direction in which they extend, that is, the cross-sections of the strip-shaped protrusions 120 are connected in a zigzag shape.
  • the first permeable membrane 12 is disposed on a side of the light-diffusing particle layer 11 adjacent to the polarizer substrate layer 20. That is, the polarizer having this configuration is the upper polarizer 01 provided on the display side of the display panel, and the light emitted from the polarizer is display light.
  • the outer surface of the panel ie, the panel
  • the attachment surface of the POL That is, the surface of the pressure sensitive adhesive layer 30 is scratched or the like.
  • FIG. 5 when light passes through the panel screen, if there is a slight scratch-like surface abnormality on the display side of the liquid crystal display panel, the brightness of light passing through the area becomes dark.
  • Fig. 6 is a schematic diagram showing the specific propagation of light including a scratched area.
  • the light 1 is irradiated to a defect such as a scratch, and refraction and reflection are generated.
  • Light 1-1 is the reflected light of light 1 (where light 1 is repeatedly reflected inside the display panel and finally scratched as shown in the figure)
  • the light 1-2 is the refracted light of the light 1.
  • Light 2, light 3, and light 4 are the same.
  • the light portion irradiated to the scratched portion is reflected from the non-scratched area after being reflected inside the display panel, so that three brightness difference areas appear when viewed from the viewing side of the display side of the display panel. That is, the A area with bright brightness, the B area with darkness (corresponding to the scratched area), and the C area with normal brightness.
  • the rear end inspection of the module can see the display failure caused by such slight scratches, but the other display functions of the display product are not abnormal. Direct scrapping of products with such minor scratches but no functional abnormalities can result in waste, resulting in reduced capacity and increased costs.
  • the polarizer provided in the embodiment of the present disclosure is attached to the upper polarizer 01 on the display side of the liquid crystal display panel, the light having the difference in brightness from the liquid crystal display panel is first transmitted through the light diffusing particle layer 11 .
  • the diffusion particles 110 can correct the direction of the light to make the light transmitted from the light-diffusing particle layer 11 uniform. After that, the light continues to pass through the zigzag strip-shaped protrusions 120, and the light of the large-angle propagation direction can be gathered, thereby solving the slight scratch on the outer surface of the panel due to various reasons, or In the process of attaching the POL, the POL attachment surface is scratched and the visibility is poor, which further improves the display quality.
  • the first permeable film 12 is disposed on a side of the light diffusing particle layer 11 adjacent to the pressure sensitive adhesive layer 30, and the polarizer having the structure is disposed adjacent to the backlight module of the display panel.
  • the light passes through the zigzag strip-shaped protrusions 120, and the light in the direction of the large-angle propagation can be gathered to improve the uniformity of the light and further improve the display quality.
  • the strip-shaped protrusions 120 in the first permeable membrane 12 may have the following parameter design:
  • the ridge height of the strip-shaped protrusions 120 ranges approximately from 35 ⁇ m ⁇ rib height ⁇ 45 ⁇ m. In one embodiment, the rib height is 35.2 ⁇ m. In another embodiment, the rib height is 40 ⁇ m. In another embodiment, the rib height is 45 ⁇ m. If the rib height is too small, the processing is difficult, and the wear is prone to occur; if the rib height is too large, the light gathering effect of the large-angle propagation direction is not good, and the ridge height has the strip-shaped protrusions 120 in the above numerical range after the light of the large-angle propagation direction is gathered. It has better uniformity and is easy to process.
  • the apex angles formed by the two sides of the strip-shaped protrusions 120 are approximately 115° ⁇ apex angle ⁇ 125°, and the brightness of the light is superior in this range.
  • the apex angle is 115.2°.
  • the apex angle is 120°.
  • the apex angle is 125°.
  • the light-receiving structure 10 further includes a second permeable membrane 13 disposed on a side of the light-diffusing particle layer 11 away from the first permeable membrane 12, as shown in FIG. 3 or FIG.
  • the second permeable membrane 13 can provide a substrate for the light-diffusing particle layer 11.
  • the material of the first permeable membrane 12 and/or the second permeable membrane 13 may be polyethylene terephthalate (ie, PET).
  • the polarizer substrate layer 20 may specifically include a first triacetate film (ie, a TAC film) 21 and a polyvinyl alcohol film which are sequentially away from the light-homogenizing structure 10. (ie, Polyvinyl Alcohol, abbreviated as PVA film) 23 and a second triacetate film (ie, TAC film) 22.
  • a first triacetate film ie, a TAC film
  • a polyvinyl alcohol film which are sequentially away from the light-homogenizing structure 10.
  • PVA film Polyvinyl Alcohol, abbreviated as PVA film
  • TAC film second triacetate film
  • the polarizer may further include a release film 40 attached to the side of the pressure sensitive adhesive layer 30 away from the light-homogenizing structure 10 to protect the pressure sensitive adhesive layer 30, and the polarizer and the liquid crystal display panel. Remove when fitting. And/or, the polarizer may further include a protective film 50 attached to the surface of the polarizer substrate layer 20 to protect the underlying polarizer substrate layer 20.
  • Embodiments of the present disclosure also provide a display device including a display panel and the polarizer disposed at at least one side of both sides of the display panel.
  • the display device may be a liquid crystal display device, and may be a product or a component having any display function, such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, a digital photo frame, and a navigator.
  • a liquid crystal display such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, a digital photo frame, and a navigator.
  • the uniform light structure 10 in the polarizer further includes the light diffusing particle layer 11 disposed away from the display.
  • a first permeable membrane 12 on the side; a surface 12a of the first permeable membrane 12 remote from the light-diffusing particle layer 11 has a plurality of strip-shaped protrusions 120 arranged in parallel; wherein each of the plurality of strip-shaped protrusions 120
  • the cross-sectional shape perpendicular to the direction in which it extends is a triangle.
  • the polarizer when the polarizer is attached to the upper polarizer 01 on the display side of the liquid crystal display panel, the light having a significant difference in brightness from the liquid crystal display panel is first transmitted through the light diffusing particle layer 11 , and the diffusing particles 110 may be The direction of the light is corrected to make the light transmitted from the light-diffusing particle layer 11 uniform. After that, the light continues to pass through the zigzag strip-shaped protrusions 120, and the light of the large-angle propagation direction can be gathered, thereby solving the slight scratch on the outer surface of the panel due to various reasons, or In the process of attaching the POL, the POL attachment surface is scratched and the visibility is poor, which further improves the display quality.
  • the light homogenizing structure 10 in the polarizer further includes the light diffusing particle layer 11 disposed adjacent to the display panel.
  • a first permeable membrane 12 on one side; a surface 12a of the first permeable membrane 12 remote from the light-diffusing particle layer 11 has a plurality of strip-shaped protrusions 120 arranged in parallel; wherein each of the plurality of strip-shaped protrusions 120
  • the shape of the cross section perpendicular to the direction in which it extends is a triangle.
  • the polarizer when the polarizer is disposed on the side of the display panel near the backlight module as the lower polarizer 02, the light passes through the zigzag strip-shaped protrusions 120, and the light of the large-angle propagation direction can be gathered. Improve light uniformity and further improve display quality.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)

Abstract

一种偏光片及显示装置，涉及显示技术领域，可提高透过偏光片的光线均匀性。偏光片包括均光结构(10)；均光结构(10)包括光扩散粒子层(11)，光扩散粒子层(11)用于提高经过偏光片的光线的均匀度。

Description

偏光片及显示装置
本公开要求于2017年3月17日提交中国专利局、申请号为201710161877.2、申请名称为“一种偏光片及显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示技术领域，尤其涉及一种偏光片及显示装置。
背景技术
液晶显示面板由相对设置的两个基板以及封装在两个基板之间的液晶层构成，从液晶显示面板中射出的显示光线需经过多层结构，使得射出的光线均匀性较低。同样的，为其提供背光的背光源模组包括有层叠设置的多层光学膜，使得射出的光线均匀性也较低。
发明内容
鉴于此，为解决现有技术的问题，本公开的实施例提供一种偏光片及显示装置，可提高透过该偏光片的光线均匀性。
为达到上述目的，本公开的实施例采用如下技术方案：
第一方面、提供一种偏光片，所述偏光片包括均光结构；所述均光结构包括光扩散粒子层，所述光扩散粒子层用于提高经过所述偏光片的光线的均匀度。
结合第一方面，在第一方面的第一种可能的实现方式中，所述偏光片还包括分别设置在所述均光结构两侧的偏光片基体层与感压胶层。
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述均光结构还包括第一透过膜；所述第一透过膜远离所述光扩散粒子层的表面具有平行排列的多个条形凸起，且所述多个条形凸起的每个沿垂直于自身延伸方向上的截面形状为三角形；其中，所述第一透过膜设置在所述光扩散粒子层靠近所述偏光片基体层的一侧，或者，所述第一透过膜设置在所述光扩散粒子层靠近所述感压胶层的一侧。
结合第一方面，在第一方面的第三种可能的实现方式中，所述光扩散粒子层中的扩散粒子形状为球形。
结合第一方面，在第一方面的第四种可能的实现方式中，所述光扩散 粒子层中的扩散粒子的粒径大约为1～20μm。
结合第一方面，在第一方面的第五种可能的实现方式中，所述光扩散粒子层中的扩散粒子的材料为聚苯乙烯树脂、聚甲基丙烯酸甲酯、聚碳酸酯和二氧化硅中的至少一种。
结合第一方面，在第一方面的第六种可能的实现方式中，所述光扩散粒子层的主体为透明膜层。
结合第一方面的第二种可能的实现方式，在第一方面的第七种可能的实现方式中，所述条形凸起的棱高数值范围大约为，35μm<所述棱高≤45μm。
结合第一方面的第二种可能的实现方式，在第一方面的第八种可能的实现方式中，所述条形凸起的两条侧边构成的顶角角度范围大约为，115°<所述顶角≤125°。
结合第一方面的第二种可能的实现方式，在第一方面的第九种可能的实现方式中，所述均光结构还包括设置在所述光扩散粒子层远离所述第一透过膜一侧的第二透过膜。
结合第一方面的第九种可能的实现方式，在第一方面的第十种可能的实现方式中，所述第一透过膜和/或所述第二透过膜的材料为聚对苯二甲酸乙二醇酯。
结合第一方面的第一种可能的实现方式，在第一方面的第十一种可能的实现方式中，所述偏光片基体层包括依次远离所述均光结构的第一三醋酸纤维素膜、聚乙烯醇膜和第二三醋酸纤维素膜。
结合第一方面的第一种可能的实现方式，在第一方面的第十二种可能的实现方式中，所述偏光片还包括，贴合在所述感压胶层远离所述均光结构一侧的离型膜；和/或，贴合在所述偏光片基体层表面的保护膜。
第二方面、提供一种显示装置，包括显示面板，所述显示装置还包括设置在所述显示面板两侧中至少一侧处的上述偏光片。
可选的，所述偏光片设置在靠近所述显示面板的显示侧的一侧；所述均光结构还包括设置在所述光扩散粒子层远离所述显示侧的第一透过膜；所述第一透过膜远离所述光扩散粒子层的表面具有平行排列的多个条形凸起；其中，所述多个条形凸起中的每个沿垂直于自身延伸方向上的截面形状为三角形；或者，所述偏光片设置在背离所述显示面板的显示侧的一侧；所述均光结构还包括设置在所述光扩散粒子层靠近所述显示面板一侧的第 一透过膜；所述第一透过膜远离所述光扩散粒子层的表面具有平行排列的多个条形凸起；其中，所述多个条形凸起中的每个沿垂直于自身延伸方向上的截面形状为三角形。
附图说明
为了更清楚地说明本公开实施例的技术方案，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公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本公开实施例提供的一种偏光片的剖面结构示意图一；
图2为本公开实施例提供的一种偏光片的剖面结构示意图二；
图3为本公开实施例提供的一种偏光片的剖面结构示意图三；
图4为本公开实施例提供的一种偏光片的剖面结构示意图四；
图5为现有技术中显示面板的显示侧或偏光片的贴附面上存在划伤时光线透过划伤处的主视方向(图中(a)部分)和剖面方向(图中(b)部分)的示意图；
图6为图5中光线透过划伤区域的光线示意图；
图7为本公开实施例提供的一种偏光片中的条形凸起的剖面结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通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，都属于本公开保护的范围。
需要指出的是，除非另有定义，本公开实施例中所使用的所有术语(包括技术和科学术语)具有与本公开所属领域的普通技术人员共同理解的相同含义。还应当理解，诸如在通常字典里定义的那些术语应当被解释为具有与它们在相关技术的上下文中的含义相一致的含义，而不应用理想化或极度形式化的意义来解释，除非这里明确地这样定义。
例如，本公开说明书以及权利要求书中所使用的术语“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，仅是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面 的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“上/上方”、“下/下方”等指示的方位或位置关系的术语为基于附图所示的方位或位置关系，仅是为了便于说明本公开的技术方案的简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。
并且，由于本公开实施例所涉及的诸如光扩散粒子层中的扩散粒子的实际尺寸非常微小，为了清楚起见，本公开实施例附图中的各结构尺寸均被放大，不代表实际尺寸与比例。
如图1所示，本公开实施例提供了一种偏光片，该偏光片包括均光结构10；该均光结构10包括光扩散粒子层11，用于提高经过该偏光片的光线的均匀度。
需要说明的是，光扩散粒子层11中分散有许多扩散粒子110，可修正透过光线的方向，使透过上述偏光片的光线更为均匀。
本公开实施例中所谓“粒子”是指在一定尺寸范围内具有特性形状的几何体。这里所说的一定尺寸通常在纳米到毫米数量级之间。因此，上述的扩散粒子即指具有较小尺寸数量级的颗粒，其微观的具体形状不限于球状，可以为多种形状具体不作限定。
图1中仅为体现出光扩散粒子层11中的扩散粒子110分散状态，扩散粒子110的大小可以相同也可以不同，本公开实施例对此不作限定。
偏光片(即Polarizer，缩写为POL)，又称之为偏振光片。它是一种由多层高分子材料复合而成的具有产生偏振光功能的光学薄膜。其应用于液晶显示面板中，能够将不具偏极性的自然光转化为偏极光，而使得与电场呈垂直方向的光线通过，这样液晶显示面板就能够正常显示影像。偏光片是一种影响液晶显示面板的显示效果的关键元件之一。
本公开实施例提供的上述偏光片中具有均光结构10，该均光结构10包括内部分散有扩散粒子110的光扩散粒子层11，扩散粒子110增大了与光线的接触程度(如图1中扩散粒子110四周的虚线箭头所示)，从而修正了光线方向，使透过该偏光片的光线更为均匀。当该偏光片具体设置在液晶显示面板的显示侧作为上偏光片时，可以提高从显示面板射出的显示光线的均匀性，提高显示品质；当该偏光片具体设置在液晶显示面板的靠近背光源模组的一侧作为下偏光片时，可以提高从背光源模组射出的背光光线的均匀性，提高显示品质。
进一步的，光扩散粒子层11的主体为透明膜层，其材料具体可以为PET(全称为polyethylene terephthalate，即聚对苯二甲酸乙二醇酯)等光学膜材中常用的透明膜层，以固定扩散粒子110。
扩散粒子110的材料可以为聚苯乙烯树脂(也称之为苯乙烯类树脂，即Poly styrene，缩写为PS)、聚甲基丙烯酸甲酯(也称之为丙烯酸类树脂，即polymethyl methacrylate，缩写为PMMA)、聚碳酸酯(即Polycarbonate，缩写为PC)和二氧化硅(SiO2)中的至少一种。
扩散粒子110形状可以为球形，以提高对光线修正的接触面积。其粒径(即直径)可以为大约1～20μm。在一个实施例中，粒径为1μm。在另一个实施例中，粒径为10μm。在另一个实施例中，粒径为20μm。
在上述基础上，如图2所示，本公开实施例提供的上述偏光片还包括如下结构，分别设置在均光结构10两侧的偏光片基体层20与感压胶层30。如图3或图4所示，上述均光结构10还包括第一透过膜12；第一透过膜12远离光扩散粒子层10的表面12a具有平行排列的多个条形凸起120，且多个条形凸起120的每个沿垂直于自身延伸方向上的截面形状为三角形。
需要说明的是，上述偏光片的整体形状通常为矩形，上述条形凸起120的延伸方向可沿矩形的任意一个侧边方向延伸。即当该偏光片的面方向为纸面时，条形凸起120的延伸方向可以为横向也可以为纵向，具体不作限定。
其中，条形凸起120沿垂直于自身延伸方向上的截面形状为三角形，即各个条形凸起120的截面连接在一起的形状为锯齿状。
进一步参考图3所示，第一透过膜12设置在光扩散粒子层11靠近偏光片基体层20的一侧。即，具有该结构的偏光片为设置在显示面板的显示侧的上偏光片01，从该偏光片射出的光线为显示光。
在液晶显示面板的生产过程的中，Panel(即面板)的外表面存在由于各种原因造成的外观上的轻微程度的划伤，或是在POL贴附的过程中，POL的贴附面(即感压胶层30的表面)有划伤等。如图5所示，光线通过Panel屏时，如果液晶显示面板的显示侧存在轻微的划伤类的表面异常，则通过该区域的光亮度会变暗。
图6为包括有划伤区域的光线的具体传播示意图，由图中可以看出，光线1照到划伤等缺陷位置处，会产生折射和反射。光线1-1为光线1的反射光(其中光线1在显示面板内部经过多次反射最终从图中所示的划伤 处的下方射出)，光线1-2为光线1的折射光。光线2、光线3、光线4与此同理。光线经过划伤区域后，由于照射到划伤处的光线部分在显示面板内部反射后从非划伤区域射出，使得从显示面板的显示侧的观察面观察时，会出现三个亮度差异区，即亮度偏亮的A区、亮度偏暗的B区(对应划伤区域)以及亮度正常的C区。液晶显示面板与POL相贴合后，模组后端检查能够看到此类轻微划伤等造成的显示不良，但该显示产品的其他显示功能特性无异常。直接报废存在此类轻微划伤但无功能特性异常的产品，会产生浪费，造成产能下降，成本增大。
而本公开实施例提供的上述偏光片作为贴合在液晶显示面板显示侧的上偏光片01时，从液晶显示面板发出的存在上述亮度差异明显的光线首先透过光扩散粒子层11，其中的扩散粒子110可以修正光线方向，使从光扩散粒子层11透射出的光线均匀化。在此之后，光线继续透过锯齿状的条形凸起120后能够将大角度传播方向的光聚拢，从而解决了Panel外表面存在由于各种原因造成的外观上的轻微程度的划伤，或是在POL贴附的过程中，POL的贴附面有划伤而导致的可视性不良，进一步提高了显示品质。
或者，进一步参考图4所示，第一透过膜12设置在光扩散粒子层11靠近感压胶层30的一侧，具有该结构的偏光片为设置在显示面板的靠近背光源模组一侧的下偏光片02，光线透过锯齿状的条形凸起120后能够将大角度传播方向的光聚拢，提高光线均匀性，进一步提高了显示品质。
在上述基础上进一步的，如图7所示，第一透过膜12中的条形凸起120可具有如下参数设计：
条形凸起120的棱高数值范围大约为，35μm<棱高≤45μm。在一个实施例中，棱高为35.2μm。在另一个实施例中，棱高为40μm。在另一个实施例中，棱高为45μm。棱高过小加工困难，且容易发生磨损；棱高过大对大角度传播方向的光聚拢效果不佳，棱高具有上述数值范围内的条形凸起120对大角度传播方向的光聚拢后的均匀性更优，且易于加工。
条形凸起120的两条侧边构成的顶角角度范围大约为，115°<顶角≤125°，在此范围内光的亮度较优。在一个实施例中，顶角为115.2°。在另一个实施例中，顶角为120°。在一个实施例中，顶角为125°。
在上述基础上进一步的，参考图3或图4所示，上述均光结构10还包括，设置在光扩散粒子层11远离第一透过膜12一侧的第二透过膜13，该第二透过膜13可为光扩散粒子层11提供一个衬底。
其中，第一透过膜12和/或第二透过膜13的材料可以为聚对苯二甲酸乙二醇酯(即PET)。
在上述基础上，参考图2所示，上述偏光片基体层20具体可包括依次远离均光结构10的第一三醋酸纤维素膜(即triacetate cellulose，简称为TAC膜)21、聚乙烯醇膜(即Polyvinyl Alcohol，简称为PVA膜)23和第二三醋酸纤维素膜(即TAC膜)22。
进一步参考图2所示，上述偏光片还可包括贴合在感压胶层30远离均光结构10一侧的离型膜40，以保护感压胶层30，在该偏光片与液晶显示面板相贴合时去除。和/或，上述偏光片还可包括贴合在偏光片基体层20表面的保护膜50，以对下方的偏光片基体层20进行保护。
本公开实施例还提供了一种显示装置，包括显示面板以及设置在显示面板两侧中至少一侧处的上述偏光片。
上述显示装置具体可以是液晶显示装置，可以为液晶显示器、液晶电视、数码相框、手机、平板电脑、数码相框、导航仪等具有任何显示功能的产品或者部件。
进一步的，参考图3所示，当上述偏光片设置在靠近显示面板的显示侧的一侧作为上偏光片01时，偏光片中的均光结构10还包括设置在光扩散粒子层11远离显示侧的第一透过膜12；第一透过膜12远离光扩散粒子层11的表面12a具有平行排列的多个条形凸起120；其中，多个条形凸起120中的每一个沿垂直于自身延伸方向上的截面形状为三角形。
本公开实施例提供上述偏光片作为贴合在液晶显示面板显示侧的上偏光片01时，从液晶显示面板发出的存在亮度差异明显的光线首先透过光扩散粒子层11，而扩散粒子110可以修正光线方向，使从光扩散粒子层11透射出的光线均匀化。在此之后，光线继续透过锯齿状的条形凸起120后能够将大角度传播方向的光聚拢，从而解决了Panel外表面存在由于各种原因造成的外观上的轻微程度的划伤，或是在POL贴附的过程中，POL的贴附面有划伤而导致的可视性不良，进一步提高了显示品质。
或者，参考图4所示，当上述偏光片设置在背离显示面板的显示侧的一侧作为下偏光片02时，偏光片中的均光结构10还包括设置在光扩散粒子层11靠近显示面板一侧的第一透过膜12；第一透过膜12远离光扩散粒子层11的表面12a具有平行排列的多个条形凸起120；其中，多个条形凸起120中的每个沿垂直于自身延伸方向上的截面形状为三角形。
本公开实施例提供上述偏光片作为设置在显示面板的靠近背光源模组一侧作为下偏光片02时，光线透过锯齿状的条形凸起120后能够将大角度传播方向的光聚拢，提高光线均匀性，进一步提高了显示品质。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (15)

  1. 一种偏光片，所述偏光片包括均光结构；所述均光结构包括光扩散粒子层，所述光扩散粒子层用于提高经过所述偏光片的光线均匀度。
  2. 根据权利要求1所述的偏光片，其中，所述偏光片还包括分别设置在所述均光结构两侧的偏光片基体层与感压胶层。
  3. 根据权利要求2所述的偏光片，其中，所述均光结构还包括第一透过膜；所述第一透过膜远离所述光扩散粒子层的表面具有平行排列的多个条形凸起，且所述多个条形凸起中的每个沿垂直于自身延伸方向上的截面形状为三角形；其中，
    所述第一透过膜设置在所述光扩散粒子层靠近所述偏光片基体层的一侧，或者，所述第一透过膜设置在所述光扩散粒子层靠近所述感压胶层的一侧。
  4. 根据权利要求1所述的偏光片，其中，所述光扩散粒子层中的扩散粒子的形状为球形。
  5. 根据权利要求1所述的偏光片，其中，所述光扩散粒子层中的扩散粒子的粒径为1～20μm。
  6. 根据权利要求1所述的偏光片，其中，所述光扩散粒子层中的扩散粒子的材料为聚苯乙烯树脂、聚甲基丙烯酸甲酯、聚碳酸酯和二氧化硅中的至少一种。
  7. 根据权利要求1所述的偏光片，其中，所述光扩散粒子层的主体为透明膜层。
  8. 根据权利要求3所述的偏光片，其中，所述条形凸起的棱高数值范围为，35μm<所述棱高≤45μm。
  9. 根据权利要求3所述的偏光片，其中，所述条形凸起的两条侧边构成的顶角角度范围为，115°<所述顶角≤125°。
  10. 根据权利要求3所述的偏光片，其中，所述均光结构还包括设置在所述光扩散粒子层远离所述第一透过膜一侧的第二透过膜。
  11. 根据权利要求10所述的偏光片，其特征在于，所述第一透过膜和/或所述第二透过膜的材料为聚对苯二甲酸乙二醇酯。
  12. 根据权利要求2所述的偏光片，其特征在于，所述偏光片基体层包括依次远离所述均光结构的第一三醋酸纤维素膜、聚乙烯醇膜和第二三醋酸纤维素膜。
  13. 根据权利要求2所述的偏光片，其中，所述偏光片还包括，贴合在所述感压胶层远离所述均光结构一侧的离型膜；和/或，贴合在所述偏光片基体层表面的保护膜。
  14. 一种显示装置，包括显示面板，其中，所述显示装置还包括设置在所述显示面板两侧中至少一侧处的如权利要求1-13任一项所述的偏光片。
  15. 根据权利要求14所述的显示装置，其特征在于，
    所述偏光片设置在靠近所述显示面板的显示侧的一侧；均光结构的第一透过膜设置在光扩散粒子层远离所述显示侧的一侧；所述第一透过膜远离所述光扩散粒子层的表面具有平行排列的多个条形凸起；其中，所述多个条形凸起中的每个沿垂直于自身延伸方向上的截面形状为三角形；
    或者，
    所述偏光片设置在背离所述显示面板的显示侧的一侧；所述均光结构的第一透过膜设置在光扩散粒子层靠近所述显示面板一侧的一侧；所述第一透过膜远离所述光扩散粒子层的表面具有平行排列的多个条形凸起；其中，所述多个条形凸起中的每个沿垂直于自身延伸方向上的截面形状为三角形。
PCT/CN2017/104561 2017-03-17 2017-09-29 偏光片及显示装置 WO2018166182A1 (zh)

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WO2020031598A1 (ja) * 2018-08-07 2020-02-13 三井金属鉱業株式会社 光拡散部材、並びにこれを用いた光拡散構造体及び発光構造体
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