WO2017193444A1 - 液晶显示装置 - Google Patents

液晶显示装置 Download PDF

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Publication number
WO2017193444A1
WO2017193444A1 PCT/CN2016/085780 CN2016085780W WO2017193444A1 WO 2017193444 A1 WO2017193444 A1 WO 2017193444A1 CN 2016085780 W CN2016085780 W CN 2016085780W WO 2017193444 A1 WO2017193444 A1 WO 2017193444A1
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WIPO (PCT)
Prior art keywords
polarizing
film layer
material film
liquid crystal
crystal display
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Ceased
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PCT/CN2016/085780
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English (en)
French (fr)
Inventor
陈黎暄
孙振华
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US15/109,123 priority Critical patent/US10514572B2/en
Publication of WO2017193444A1 publication Critical patent/WO2017193444A1/zh
Anticipated expiration legal-status Critical
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    • 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
    • G02F1/1336—Illuminating devices
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
    • 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
    • G02F1/133545—Dielectric stack 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a liquid crystal display device.
  • LCD Liquid crystal display
  • PDAs personal digital assistants
  • digital cameras computer screens or laptop screens, etc.
  • liquid crystal displays which include a liquid crystal panel and a backlight module.
  • the working principle of the LCD display device is to use the optical rotation and birefringence of the liquid crystal, and the rotation of the liquid crystal is controlled by the voltage, so that the linearly polarized light passing through the lower polarizer is rotated accordingly, from the upper polarizer (the polarization direction of the upper polarizer) Vertically, the upper and lower polarizers plus the liquid crystal cell function as optical switches. Therefore, a polarizer must be attached to each of the upper and lower sides of the liquid crystal display panel.
  • a conventional polarizer is mainly an absorption type polymer polarizer, which mainly functions by adding a material having a polarizing effect to a polymer film layer.
  • the principle of the deviation of the light is: since the light wave is a transverse wave, the vibration direction of the light wave is perpendicular to the propagation direction, and the component of the light that is consistent with the polarization direction of the polarizer can pass through the polarizer and is perpendicular to the polarization direction of the polarizer.
  • the component is absorbed by the polarizer and cannot pass through the polarizer. Therefore, the light passes through the polarizer and becomes linearly polarized light.
  • the polymer polarizer can be roughly classified into two types according to the type of the light absorbing molecule.
  • One is an iodine-based polarizer, which has an optical property of easily obtaining high transmittance and high degree of polarization, but is capable of withstanding high temperature and high humidity.
  • the other type is a dye-based polarizer, which has an optical property that is not easy to obtain high transmittance and high degree of polarization, but has a high ability to withstand high temperature and high humidity. Therefore, it is necessary to provide a liquid crystal display device to solve the above problems.
  • An object of the present invention is to provide a liquid crystal display device.
  • the upper and lower polarizers have a multi-layer film structure, and are combined with the backlight of the backlight module to enter at a certain angle to function as a polarizing light, and the upper and lower polarizers have thermal stability. Good, good moisture resistance, high reliability, and simple preparation method.
  • the present invention provides a liquid crystal display device including: a backlight module, An LCD panel disposed above the backlight module, an upper polarizer disposed on a side of the LCD panel away from the backlight module, and a lower polarizer disposed on a side of the LCD panel adjacent to the backlight module;
  • the upper and lower polarizers have a multilayer film structure, each comprising a plurality of layers of polarizing film units stacked in sequence, the polarizing film unit comprising at least two layers of material films having different refractive indices;
  • the emitted light of the backlight module is obliquely irradiated on the lower polarizer.
  • the upper and lower polarizers are formed on the upper and lower surfaces of the LCD panel by evaporation, sputtering or spin coating.
  • the upper and lower polarizers each comprise a layer of 20-100 layers of material.
  • the material film layer in the polarizing film unit is a metal material film layer.
  • each material film layer in the polarizing film unit is from 100 nm to 400 nm.
  • the polarizing film unit comprises two layers of material films of different refractive indices, which are a first polarizing material film layer and a second polarizing material film layer, respectively.
  • the optical thickness ratio of the first polarizing material film layer and the second polarizing material film layer is 1:0.6-1.5.
  • the optical thicknesses of the first polarizing material film layer and the second polarizing material film layer are the same.
  • the optical thickness ratio of the first polarizing material film layer and the second polarizing material film layer is 0.8:1.2.
  • the first polarizing material film layer has a refractive index of 1.2 to 1.5, and the second polarizing material film layer has a refractive index of 1.7 to 2.3.
  • the present invention further provides a liquid crystal display device, comprising: a backlight module, an LCD panel disposed above the backlight module, an upper polarizer disposed on a side of the LCD panel away from the backlight module, and The LCD panel is adjacent to the lower polarizer on one side of the backlight module;
  • the upper and lower polarizers have a multilayer film structure, each comprising a plurality of layers of polarizing film units stacked in sequence, the polarizing film unit comprising at least two layers of material films having different refractive indices;
  • the emitted light of the backlight module is obliquely irradiated on the lower polarizer
  • the upper and lower polarizers are formed on the upper and lower surfaces of the LCD panel by evaporation, sputtering or spin coating;
  • the upper and lower polarizers each comprise a layer of 20-100 layers of material
  • the material film layer in the polarizing film unit is a metal material film layer
  • each material film layer in the polarizing film unit is from 100 nm to 400 nm.
  • a liquid crystal display device wherein the upper and lower polarizers are of a multilayer film structure, each comprising a plurality of layers of polarizing film units stacked in sequence, the polarizing film unit comprising at least two layers of different refractive indices.
  • the material film layer the light is repeatedly deflected by the interface in the multi-layer film structure, and the S-polarized light and the P-polarized light can be completely separated to form linearly polarized light; the emitted light of the backlight module is incident at a certain angle to the lower layer.
  • the light is repeatedly deflected by the interface in the lower polarizer of the multilayer film structure, and the S-polarized light is completely separated from the P-polarized light, and only the P-polarized light is made.
  • the upper and lower polarizers adopt a multi-layer film structure, and have high transmittance and high polarization degree optical characteristics, and have good thermal stability and moisture resistance, compared with the conventional absorption type polymer polarizer. The advantages are good, the degree of reliability is high, and the preparation method is relatively simple.
  • FIG. 1 is a schematic structural view of a liquid crystal display device of the present invention
  • FIG. 2 is a schematic view showing the structure of upper and lower polarizers of the liquid crystal display device of the present invention.
  • a liquid crystal display device includes a backlight module 1 , an LCD panel 2 disposed above the backlight module 1 , and a side of the LCD panel 2 away from the backlight module 1 .
  • the upper polarizer 31 and the lower polarizer 32 disposed on the side of the LCD panel 2 adjacent to the backlight module 1 are provided.
  • the upper and lower polarizers 31, 32 have a multilayer film structure each including a plurality of layers of polarizing film units 300 stacked in sequence, and the polarizing film unit 300 includes at least two layers of material films having different refractive indices.
  • the vibration direction of the light wave is perpendicular to the propagation direction, and the light is divided into a P component in which the vibration direction is in a plane formed by the incident light and the normal, that is, an incident surface, and an S component perpendicular to a plane formed by the incident light and the normal; Since natural light is deflected through the interface, it will cause a change in the polarization state. In particular, when incident at Brewster's angle, the reflected light will be completely linearly polarized, which is S-polarized light whose vibration direction is perpendicular to the incident surface, and the transmitted light is Partially polarized light.
  • the upper and lower polarizers 31, 32 of the multilayer film structure have similar functions to those of the conventional polarizer, and also have a polarizing function.
  • the emitted light of the backlight module 1 is obliquely irradiated onto the lower polarizer 32, and the backlight is deflected by the above-described interface a plurality of times in the lower polarizer 32, so that only the p-polarized light can pass.
  • the incident angle ⁇ of the outgoing light of the backlight module 1 on the lower polarizer 32 depends on the optical properties of the multilayer film structure of the upper and lower polarizers 31 and 32 themselves.
  • the upper and lower polarizers 31 and 32 of the multilayer film structure are respectively formed on the upper and lower surfaces of the LCD panel 2 by vapor deposition, sputtering or spin coating, and the preparation method is relatively simple.
  • the upper and lower polarizers 31, 32 each include 20-100 layers of material film layers.
  • the material film layer in the polarizing film unit 300 is a metal material film layer, and the upper and lower polarizing plates 31 and 32 of the metal material are respectively formed on the upper and lower sides of the LCD panel 2 by evaporation or sputtering.
  • the surface compared with the conventional polarizer, it has more obvious advantages, and has the advantages of good thermal stability, good moisture resistance, high reliability, and simple preparation method.
  • the optical thickness (the product of the refractive index and the physical thickness of the film layer) of each material film layer in the polarizing film unit 300 is from 100 nm to 400 nm.
  • the polarizing film unit 300 includes two layers of material films of different refractive indices, which are a first polarizing material film layer 301 and a second polarizing material film layer 302, respectively.
  • the optical thicknesses of the first polarizing material film layer 301 and the second polarizing material film layer 302 are substantially equal, and the thickness ratio thereof may be finely adjusted, for example, the first polarizing material film layer 301 and the second polarizing film.
  • the optical thickness ratio of the material film layer 302 was 0.8:1.2.
  • the optical thickness ratio of the first polarizing material film layer 301 and the second polarizing material film layer 302 is 1:0.6-1.5.
  • the first polarizing material film layer 301 and the second polarizing material film layer 302 have the same optical thickness.
  • the first polarizing material film layer 301 has a refractive index of 1.2-1.5
  • the second polarizing material film layer 302 has a refractive index of 1.7-2.3.
  • the backlight module 1 starts to emit light, and the emitted light is incident on the lower polarizer 32 on the lower side of the LCD panel 2 at a certain incident angle, and the emitted light is in the multilayer film structure.
  • the lower polarizer 32 undergoes multiple times of interface buckling, completely separates the S-polarized light from the P-polarized light, and only passes the P-polarized light, thereby realizing the polarizing function, and the upper and lower polarizers 31 of the multilayer film structure, 32 can be formed on the upper and lower surfaces of the LCD panel 2 by evaporation, sputtering or spin coating, and the preparation method is relatively simple.
  • the upper and lower polarizers adopt a multilayer film structure, each of which includes a plurality of layers of polarizing film units stacked in sequence, and the polarizing film unit includes at least two layers of material layers having different refractive indices.
  • the light is repeatedly deflected by the interface in the multilayer film structure, and the S-polarized light and the P-polarized light can be completely separated to form linearly polarized light; the emitted light of the backlight module is incident on the lower polarizer at a certain angle, and the light is incident on the lower polarizer.
  • the upper and lower polarizers adopt a multilayer film structure, and Compared with the conventional absorption type polymer polarizer, it has high transmittance and high polarization degree optical characteristics, and also has good thermal stability, good moisture resistance, and reliability. The degree is high, and the preparation method is relatively simple.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

一种液晶显示装置，上、下偏光片（31，32）采用多层膜结构，均包括依次层叠的数层偏光膜单元（300），所述偏光膜单元（300）包括至少两层不同折射率的材料膜层；光线在多层膜结构中经多次的界面折反射，可将S偏振光与P偏振光完全分开，从而形成线偏振光；背光模组（1）的出射光以一定角度入射至下偏光片（32）上，光线在多层膜结构的下偏光片（32）中经过多次的界面折反射，将S偏振光与P偏振光完全分开，仅使P偏振光通过；所述上、下偏光片（31，32）采用多层膜结构，与传统的吸收型高分子偏光片相比，具有高透过率、高偏振度的光学特性的同时，还具有热稳定性好、耐湿性好、可靠性程度高等优点，且制备方法较为简单。

Description

液晶显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种液晶显示装置。
背景技术
液晶显示装置(Liquid Crystal Display，LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。如：液晶电视、移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记本电脑屏幕等，在平板显示领域中占主导地位。
现有市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模组(Backlight Module)。LCD显示器件的工作原理是利用液晶的旋光性和双折射，通过电压控制液晶的转动，使经过下偏光片后的线偏振光随之发生旋转，从上偏光片(与上偏光片的偏振方向垂直)射出，从而上、下偏光片加上液晶盒起到光开关的作用。因此，液晶显示面板上下两侧还必须各贴附一片偏光片。
传统的偏光片主要为吸收型的高分子偏光片，其主要通过在高分子膜层中加入含有具有偏光作用的材料而起到偏振作用。其对光线起偏的原理为：由于光波为横波，光波的振动方向与传播方向垂直，光线上与偏光片的偏振方向一致的分量，则能够穿过偏光片，与偏光片的偏振方向垂直的分量，则被偏光片吸收，不能穿过偏光片，因此，光线通过偏光片后成为线偏振光。上述高分子偏光片按照光吸收分子的种类大致上又可以分为两类，一是碘系偏光片，具有容易获得高透过率、高偏振度的光学特性，但是耐高温高湿的能力较差，另一类是染料系偏光片，具有不容易获得高透过率、高偏振度的光学特性，但是耐高温高湿的能力较好，因此需要提出一种液晶显示装置解决上述问题。
发明内容
本发明的目的在于提供一种液晶显示装置，上、下偏光片具有多层膜结构，并结合背光模组的背光以一定角度入射，而起到偏光作用，上、下偏光片具有热稳定性好、耐湿性好、可靠性程度高等优点，且制备方法简单。
为实现上述目的，本发明提供一种液晶显示装置，包括：背光模组、 设于背光模组上方的LCD面板、设于所述LCD面板远离所述背光模组一侧的上偏光片、及设于所述LCD面板靠近所述背光模组一侧的下偏光片；
所述上、下偏光片具有多层膜结构，均包括依次层叠的数层偏光膜单元，所述偏光膜单元包括至少两层不同折射率的材料膜层；
所述背光模组的出射光倾斜地照射在所述下偏光片上。
所述上、下偏光片通过蒸镀、溅射或旋涂的方式形成在LCD面板的上、下表面上。
所述上、下偏光片均包括20-100层材料膜层。
所述偏光膜单元中的材料膜层为金属材料膜层。
所述偏光膜单元中每一材料膜层的光学厚度为100nm-400nm。
所述偏光膜单元包括两层不同折射率的材料膜层，分别为第一偏光材料膜层和第二偏光材料膜层。
所述第一偏光材料膜层和第二偏光材料膜层的光学厚度比为1:0.6-1.5。
所述第一偏光材料膜层和第二偏光材料膜层的光学厚度相同。
所述第一偏光材料膜层和第二偏光材料膜层的光学厚度比为0.8:1.2。
所述第一偏光材料膜层的折射率为1.2-1.5，所述第二偏光材料膜层的折射率为1.7-2.3。
本发明还提供一种液晶显示装置，包括：背光模组、设于背光模组上方的LCD面板、设于所述LCD面板远离所述背光模组一侧的上偏光片、及设于所述LCD面板靠近所述背光模组一侧的下偏光片；
所述上、下偏光片具有多层膜结构，均包括依次层叠的数层偏光膜单元，所述偏光膜单元包括至少两层不同折射率的材料膜层；
所述背光模组的出射光倾斜地照射在所述下偏光片上；
其中，所述上、下偏光片通过蒸镀、溅射或旋涂的方式形成在LCD面板的上、下表面上；
其中，所述上、下偏光片均包括20-100层材料膜层；
其中，所述偏光膜单元中的材料膜层为金属材料膜层；
其中，所述偏光膜单元中每一材料膜层的光学厚度为100nm-400nm。
本发明的有益效果：本发明提供的一种液晶显示装置，上、下偏光片采用多层膜结构，均包括依次层叠的数层偏光膜单元，所述偏光膜单元包括至少两层不同折射率的材料膜层；光线在多层膜结构中经多次的界面折反射，可将S偏振光与P偏振光完全分开，从而形成线偏振光；背光模组的出射光以一定角度入射至下偏光片上，光线在多层膜结构的下偏光片中经过多次的界面折反射，将S偏振光与P偏振光完全分开，仅使P偏振光 通过；所述上、下偏光片采用多层膜结构，与传统的吸收型高分子偏光片相比，具有高透过率、高偏振度的光学特性的同时，还具有热稳定性好、耐湿性好、可靠性程度高等优点，且制备方法较为简单。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为本发明的液晶显示装置的结构示意图；
图2为本发明的液晶显示装置的上、下偏光片的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明提供一种液晶显示装置，包括：背光模组1、设于背光模组1上方的LCD面板2、设于所述LCD面板2远离所述背光模组1一侧的上偏光片31、及设于所述LCD面板2靠近所述背光模组1一侧的下偏光片32。
具体地，所述上、下偏光片31、32具有多层膜结构，均包括依次层叠的数层偏光膜单元300，所述偏光膜单元300包括至少两层不同折射率的材料膜层。
具体地，光波的振动方向与传播方向垂直，将光线分为振动方向处于入射光与法线形成的平面即入射面内的P分量、及垂直于入射光与法线形成的平面的S分量；由于自然光经界面折反射时，将引起偏振态的改变，特别的，在以布鲁斯特角入射时，反射光将为完全线偏光，为振动方向与入射面垂直的S偏振光，而透射光为部分偏振光。那么，当光线在多层膜结构的上、下偏光片31、32内经过多次这样的界面折反射，可将S偏振光与P偏振光完全分开。因此，多层膜结构的上、下偏光片31、32与传统偏光片的功能类似，同样具有偏光功能。
具体地，所述背光模组1的出射光倾斜地照射在所述下偏光片32上，背光在下偏光片32内经过多次上述的界面折反射，可仅使p偏振光通过。
具体地，所述背光模组1的出射光在下偏光片32上的入射角度θ根据上、下偏光片31、32的多层膜结构本身的光学性质而定。
具体地，多层膜结构的上、下偏光片31、32通过蒸镀、溅射或旋涂等成膜技术分别形成在LCD面板2的上、下表面上，制备方法较为简单。
具体地，所述上、下偏光片31、32均包括20-100层材料膜层。
优选地，所述偏光膜单元300中的材料膜层为金属材料膜层，则金属材料的上、下偏光片31、32，通过蒸镀或溅射方式分别形成在LCD面板2的上、下表面上，相较于传统的偏光片，具有更为明显的优势，其优点在于热稳定性好，耐湿性好，可靠性程度高，且制备方法较为简单。
具体地，所述偏光膜单元300中每一材料膜层的光学厚度(折射率与膜层物理厚度之积)为100nm-400nm。
具体地，如图2所示，所述偏光膜单元300包括两层不同折射率的材料膜层，分别为第一偏光材料膜层301和第二偏光材料膜层302。
具体地，所述第一偏光材料膜层301和第二偏光材料膜层302的光学厚度基本上相当，也可微调其厚度配比，例如，所述第一偏光材料膜层301和第二偏光材料膜层302的光学厚度比为0.8:1.2。
具体地，所述第一偏光材料膜层301和第二偏光材料膜层302的光学厚度比为1:0.6-1.5。
优选地，所述第一偏光材料膜层301和第二偏光材料膜层302的光学厚度相同。
具体地，所述第一偏光材料膜层301的折射率为1.2-1.5，所述第二偏光材料膜层302的折射率为1.7-2.3。
需要说明的是，本发明的液晶显示装置工作时，背光模组1开始发光，其出射光线以一定的入射角度入射至LCD面板2下侧的下偏光片32中，出射光线在多层膜结构的下偏光片32中经过多次的界面折反射，将S偏振光与P偏振光完全分开，仅使P偏振光通过，从而实现偏光功能，同时多层膜结构的上、下偏光片31、32可通过蒸镀、溅射或旋涂的方式形成在LCD面板2的上下表面上，制备方法较为简单。
综上所述，本发明的液晶显示装置，上、下偏光片采用多层膜结构，均包括依次层叠的数层偏光膜单元，所述偏光膜单元包括至少两层不同折射率的材料膜层；光线在多层膜结构中经多次的界面折反射，可将S偏振光与P偏振光完全分开，从而形成线偏振光；背光模组的出射光以一定角度入射至下偏光片上，光线在多层膜结构的下偏光片中经过多次的界面折反射，将S偏振光与P偏振光完全分开，仅使P偏振光通过；所述上、下偏光片采用多层膜结构，与传统的吸收型高分子偏光片相比，具有高透过率、高偏振度的光学特性的同时，还具有热稳定性好、耐湿性好、可靠性 程度高等优点，且制备方法较为简单。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (16)

  1. 一种液晶显示装置，包括：背光模组、设于背光模组上方的LCD面板、设于所述LCD面板远离所述背光模组一侧的上偏光片、及设于所述LCD面板靠近所述背光模组一侧的下偏光片；
    所述上、下偏光片具有多层膜结构，均包括依次层叠的数层偏光膜单元，所述偏光膜单元包括至少两层不同折射率的材料膜层；
    所述背光模组的出射光倾斜地照射在所述下偏光片上。
  2. 如权利要求1所述的液晶显示装置，其中，所述上、下偏光片通过蒸镀、溅射或旋涂的方式形成在LCD面板的上、下表面上。
  3. 如权利要求1所述的液晶显示装置，其中，所述上、下偏光片均包括20-100层材料膜层。
  4. 如权利要求1所述的液晶显示装置，其中，所述偏光膜单元中的材料膜层为金属材料膜层。
  5. 如权利要求1所述的液晶显示装置，其中，所述偏光膜单元中每一材料膜层的光学厚度为100nm-400nm。
  6. 如权利要求1所述的液晶显示装置，其中，所述偏光膜单元包括两层不同折射率的材料膜层，分别为第一偏光材料膜层和第二偏光材料膜层。
  7. 如权利要求6所述的液晶显示装置，其中，所述第一偏光材料膜层和第二偏光材料膜层的光学厚度比为1:0.6-1.5。
  8. 如权利要求7所述的液晶显示装置，其中，所述第一偏光材料膜层和第二偏光材料膜层的光学厚度相同。
  9. 如权利要求7所述的液晶显示装置，其中，所述第一偏光材料膜层和第二偏光材料膜层的光学厚度比为0.8:1.2。
  10. 如权利要求6所述的液晶显示装置，其中，所述第一偏光材料膜层的折射率为1.2-1.5，所述第二偏光材料膜层的折射率为1.7-2.3。
  11. 一种液晶显示装置，包括：背光模组、设于背光模组上方的LCD面板、设于所述LCD面板远离所述背光模组一侧的上偏光片、及设于所述LCD面板靠近所述背光模组一侧的下偏光片；
    所述上、下偏光片具有多层膜结构，均包括依次层叠的数层偏光膜单元，所述偏光膜单元包括至少两层不同折射率的材料膜层；
    所述背光模组的出射光倾斜地照射在所述下偏光片上；
    其中，所述上、下偏光片通过蒸镀、溅射或旋涂的方式形成在LCD面 板的上、下表面上；
    其中，所述上、下偏光片均包括20-100层材料膜层；
    其中，所述偏光膜单元中的材料膜层为金属材料膜层；
    其中，所述偏光膜单元中每一材料膜层的光学厚度为100nm-400nm。
  12. 如权利要求11所述的液晶显示装置，其中，所述偏光膜单元包括两层不同折射率的材料膜层，分别为第一偏光材料膜层和第二偏光材料膜层。
  13. 如权利要求12所述的液晶显示装置，其中，所述第一偏光材料膜层和第二偏光材料膜层的光学厚度比为1:0.6-1.5。
  14. 如权利要求13所述的液晶显示装置，其中，所述第一偏光材料膜层和第二偏光材料膜层的光学厚度相同。
  15. 如权利要求13所述的液晶显示装置，其中，所述第一偏光材料膜层和第二偏光材料膜层的光学厚度比为0.8:1.2。
  16. 如权利要求12所述的液晶显示装置，其中，所述第一偏光材料膜层的折射率为1.2-1.5，所述第二偏光材料膜层的折射率为1.7-2.3。
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