WO2020133806A1 - 液晶显示装置 - Google Patents

液晶显示装置 Download PDF

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Publication number
WO2020133806A1
WO2020133806A1 PCT/CN2019/082660 CN2019082660W WO2020133806A1 WO 2020133806 A1 WO2020133806 A1 WO 2020133806A1 CN 2019082660 W CN2019082660 W CN 2019082660W WO 2020133806 A1 WO2020133806 A1 WO 2020133806A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
polarizer
crystal display
display device
backlight module
Prior art date
Application number
PCT/CN2019/082660
Other languages
English (en)
French (fr)
Inventor
罗成志
Original Assignee
武汉华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to US16/472,521 priority Critical patent/US20210333626A1/en
Publication of WO2020133806A1 publication Critical patent/WO2020133806A1/zh

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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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding 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
    • G02F1/133504—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
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/03—Viewing layer characterised by chemical composition
    • C09K2323/035—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
    • 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
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present application relates to the field of display, in particular to a liquid crystal display device.
  • Thin-film transistor liquid crystal display (TFT-LCD, thin Film transistor-liquid crystal display) has the advantages of low power consumption, high contrast and space saving, and has become the most mainstream display device on the market.
  • the thin-film transistor liquid crystal display is provided with a backlight, a backlight-side polarizer, a thin-film transistor, a liquid crystal cell, a color filter substrate, and a display-side polarizer in order.
  • projects are being developed for power saving, high definition, and improved color reproducibility.
  • increasing the transmittance can improve the brightness of the thin film transistor liquid crystal display and reduce the power consumption, which is a difficult problem that is being overcome by various panel manufacturers around the world.
  • the light transmittance of a thin film transistor liquid crystal display refers to the ratio of the light intensity before and after the backlight passes through the thin film transistor liquid crystal display panel. Normally, the light transmittance of a thin-film transistor liquid crystal display is only 3%-10%, that is, more than 90% of light cannot be used.
  • the liquid crystal display panel has a low light transmittance and a large amount of incident light cannot be utilized, and improvement is urgently needed.
  • the present application relates to a liquid crystal display device, which is used to solve the problems in the prior art that the liquid crystal display panel has a low light transmittance and a large amount of incident light cannot be utilized.
  • a liquid crystal display device includes: an ordinary polarizer, a liquid crystal layer and a backlight module;
  • the ordinary polarizer is provided on the color film substrate;
  • the liquid crystal layer is disposed under the ordinary polarizer, between the ordinary polarizer and the backlight module;
  • the backlight module further includes: a diffusion sheet, a multi-layer film polarizer, a ⁇ /4 wave plate, a light source, a light guide plate, and a reflection sheet;
  • the diffusion sheet is disposed below the liquid crystal layer, and is disposed opposite to the ordinary polarizer;
  • the multi-layer film polarizer is composed of at least one film, and is arranged directly under the diffusion film;
  • the ⁇ /4 wave plate is disposed between the multilayer film polarizer and the light guide plate;
  • the light guide plate is disposed below the ⁇ /4 wave plate, the front surface of the light guide plate is a plane, and the bottom surface is a dot surface.
  • the reflective sheet is disposed below the light guide plate, and the bottom end of the backlight module.
  • the backlight module is an edge-lit backlight module or a direct-lit backlight module.
  • the multilayer film polarizer uses polyethylene terephthalate or polyvinyl alcohol polymer plastic material.
  • the number of layers of the multilayer film polarizer is greater than 500.
  • the total thickness of the multilayer film polarizer does not exceed 100um.
  • the thickness of each layer of the multilayer film polarizer is 95-195 nm.
  • the diffusion sheet uses a polymer material polyethylene terephthalate or polycarbonate as a base material, and an acrylic resin material as a diffusion layer and a protective layer.
  • the diffusion particles in the diffusion layer are polymethyl methacrylate with irregular particle sizes.
  • the ⁇ /4 wave plate is made of polymer material polymethyl methacrylate or polyethylene terephthalate.
  • the ordinary polarizer uses an iodine polyvinyl alcohol type polarizer.
  • the polarization direction of the ordinary polarizer is perpendicular to the direction of the multilayer film polarizer.
  • This application also provides another liquid crystal display device, including: a common polarizer, a liquid crystal layer and a backlight module;
  • the ordinary polarizer is provided on the color film substrate;
  • the liquid crystal layer is disposed under the ordinary polarizer, between the ordinary polarizer and the backlight module;
  • the backlight module further includes: a diffusion sheet, a multi-layer film polarizer, a ⁇ /4 wave plate, a light source, a light guide plate, and a reflection sheet;
  • the diffusion sheet is disposed below the liquid crystal layer, and is disposed opposite to the ordinary polarizer;
  • the multi-layer film polarizer is composed of at least one film, and is arranged directly under the diffusion film;
  • the ⁇ /4 wave plate is disposed between the multilayer film polarizer and the light guide plate;
  • the light guide plate is arranged below the ⁇ /4 wave plate
  • the reflective sheet is disposed below the light guide plate, and the bottom end of the backlight module.
  • the backlight module is an edge-lit backlight module or a direct-lit backlight module.
  • the multilayer film polarizer uses polyethylene terephthalate or polyvinyl alcohol polymer plastic material.
  • the number of layers of the multilayer film polarizer is greater than 500.
  • the total thickness of the multilayer film polarizer does not exceed 100um.
  • the thickness of each layer of the multilayer film polarizer is 95-195 nm.
  • the diffusion sheet uses a polymer material polyethylene terephthalate or polycarbonate as a base material, and an acrylic resin material as a diffusion layer and a protective layer.
  • the diffusion particles in the diffusion layer are polymethyl methacrylate with irregular particle sizes.
  • the ⁇ /4 wave plate is made of polymer material polymethyl methacrylate or polyethylene terephthalate.
  • this application replaces the iodine-type polyvinyl alcohol polarizer on the array substrate side with a multilayer film structure polarizer, adjusts the structure of the light guide plate to make incident light enter at the Brewster angle, and at the same time in the multilayer film Add a ⁇ /4 wave plate to the light guide plate.
  • the refractive polarizer proposed in this application can transform natural light into polarized light and transmit the light that has not passed through the multilayer film after changing the polarization direction, thereby greatly improving Transmittance of light.
  • FIG. 1 is a liquid crystal display device provided with an additional dual brightness enhancement film on an array substrate provided by an embodiment of the present application.
  • FIG. 2 is a light propagation route diagram of a multilayer film polarizer in a liquid crystal display device provided by an embodiment of the present application.
  • FIG. 3 is a structural diagram of light entering a multilayer film polarizer in a liquid crystal display device provided by an embodiment of the present application.
  • FIG. 4 is a first light output circuit diagram of a light guide plate in a liquid crystal display device provided by an embodiment of the present application.
  • FIG. 5 is a first schematic structural diagram of a liquid crystal display device provided by an embodiment of the present application.
  • FIG. 6 is a second light output circuit diagram of a light guide plate in a liquid crystal display device provided by an embodiment of the present application.
  • FIG. 7 is a second schematic structural diagram of a liquid crystal display device provided by an embodiment of the present application.
  • first and second are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include one or more of the features.
  • the meaning of “plurality” is two or more, unless otherwise specifically limited.
  • This application provides a liquid crystal display device, as shown in Figures 1-7.
  • the maximum transmittance of the two-layer polarizer under the action of liquid crystal is only 40%.
  • polarizers are concerned, currently commonly used are iodine polyvinyl alcohol (PVA) polarizers.
  • PVA polyvinyl alcohol
  • the principle of polarization is that iodine molecules absorb polarized light parallel to the absorption axis and transmit polarized light perpendicular to the absorption axis. Theoretically, the maximum transmittance of this polarizer is 50%. However, due to manufacturing processes and other reasons, its transmittance is often less than 45%.
  • the dual brightness enhancement film uses light circulation to increase its transmittance.
  • the dual brightness enhancement film is a multi-layer film structure, which integrates 800 layers of films with different thicknesses and different refractive indexes in a thickness of 100 um.
  • the transmission axis of the dual brightness enhancement film 32 is adjusted to coincide with the polarization direction of the polarizer 31 on the array substrate, the light parallel to the polarizer 31 will pass through the dual brightness enhancement film 32, and the light perpendicular to the polarizer 31 will be double brightness first
  • the enhancement film 32 is reflected, and then reflected by the reflection sheet 35 at the bottom of the backlight module 3, and after changing the polarization direction, passes through the dual brightness enhancement film 32 again.
  • the dual brightness enhancement film 32 can increase the overall brightness of the entire backlight module 3 by 40%-45%.
  • the core principle of this dual brightness enhancement film 32 is to improve the reflection of light by changing the polarization state of light.
  • light needs to enter the dual brightness enhancement film 32 at a specific angle to achieve a higher polarization state selection effect.
  • the polarization direction of the light reflected by the dual brightness enhancement film 32 does not change significantly, and needs to be reflected after multiple reflections to pass through, so there will still be a lot of loss before passing through the polarizer 31 on the array substrate.
  • this application designs a new type of liquid crystal display device, which uses a multi-layer film polarizer structure to replace the polarizer on the array substrate.
  • a multi-layer film polarizer structure to replace the polarizer on the array substrate.
  • the ⁇ /4 wave plate added between the film polarizer and the light guide plate makes the incident light enter the multilayer film polarizer at the Brewster angle.
  • the reflected light is polarized light whose polarization direction is perpendicular to the incident surface (ie, S Component), the transmitted light is partially polarized light.
  • the transmitted light is 100% of the polarized light (ie P component) whose polarization direction is parallel to the incident surface, and about 15% of the transmitted light meets an interface.
  • the light is reflected by the S component, see Figure 2.
  • the multilayer film can be used as a polarizer. Then add a ⁇ /4 wave plate between the backlight and the lower reflector, and adjust the o and e optical axes of the ⁇ /4 wave plate to a 45° angle with the S component.
  • the S component reflected by the multi-layer film becomes left-handed (or right-handed) circularly polarized light after passing through the ⁇ /4 wave plate, and then becomes right-handed (or left-handed) circularly polarized light after being reflected by the reflective sheet under the backlight module, and then After passing through the ⁇ /4 wave plate, it becomes P-component linearly polarized light. That is, the working principle of the liquid crystal display device is to convert natural light entering the multilayer film polarizer into polarized light transmission, and the ⁇ /4 wave plate changes the polarization direction of the light that has not passed through the multilayer film polarizer and then transmits it The transmittance reaches 100%.
  • a liquid crystal display device provided by the present application includes: an ordinary polarizer 1 ′, a liquid crystal layer 2 ′ and a backlight module 3 ′; the ordinary polarizer 1 ′ is provided on a color film substrate; the liquid crystal The layer 2'is disposed below the ordinary polarizer 1', between the ordinary polarizer 1'and the backlight module 3'; the backlight module 3'further includes: a diffusion sheet 31', multiple layers Film polarizer 32', ⁇ /4 wave plate 33', light source 34', light guide plate 35', and reflective sheet 36'; the diffusion sheet 31' is disposed below the liquid crystal layer 2', facing the ordinary polarized light The sheet 1'is arranged; the multilayer film polarizer 32' is composed of at least one membrane, which is arranged directly under the diffusion sheet 31'; the ⁇ /4 wave plate 33' is arranged on the multilayer film Between the polarizer 32' and the light guide plate 35', together with the light guide plate 35' and the reflection plate 36'
  • the multi-layer film polarizer uses polyethylene terephthalate or polyvinyl alcohol polymer plastic material with good light transmittance.
  • the number of layers of the multilayer film polarizer provided in this application must be greater than 500, but the total thickness does not exceed 100um, and the thickness of each layer of the multilayer film polarizer is 95- 195 nm.
  • a diffusion sheet 31' needs to be attached to the multi-layer film polarizer 32', and the diffusion sheet 31' is made of polymer material polyethylene terephthalate or Polycarbonate is used as a base material, and acrylic resin 313' is used as a diffusion layer and a protective layer.
  • the diffusion particles in the diffusion layer are transparent particles of polymethyl methacrylate 311' with irregular particle sizes. Its function is mainly to diffuse the light and atomize the light in a specific direction refracted by the multi-layer film polarizer 32' to make the light more uniform and delicate. Referring to Fig. 3, from the bottom to the top, the light entering the multilayer film polarizer 32' and the diffuser 31' is viewed.
  • the front surface of the light guide plate 35 ′ is flat, and the bottom surface is a dot surface.
  • the size of the dot surface, the spacing between the dots and the depth of the dots can be adjusted so that the reflected light
  • a ⁇ /4 wave plate 33' needs to be pasted on the light guide plate 35', and the ⁇ /4 wave plate 33' is a phase difference plate, using a polymer material polymethacrylic acid Methyl ester or polyethylene terephthalate is made by uniaxial stretching. When stretched, the film molecules are aligned, showing a birefringence effect. When the thickness of the film is ⁇ /4 (ne-no), the phase difference of the transmitted light in the o and e directions is ⁇ /2. When the light polarization direction is at an angle of 45° to the o and e axes, the effect is to change linearly polarized light into circularly polarized light and circularly polarized light into linearly polarized light.
  • the ordinary polarizer 1' adopts an iodine polyvinyl alcohol type polarizer, and the polarization direction of the ordinary polarizer 1'is perpendicular to the direction of the multilayer film polarizer 32' .
  • a liquid crystal display device provided by the present application includes: an ordinary polarizer 1'', a liquid crystal layer 2'', and a backlight module 3''; the ordinary polarizer 1'' is provided in a color On the film substrate; the liquid crystal layer 2'' is disposed below the ordinary polarizer 1'', between the ordinary polarizer 1'' and the backlight module 3''; the backlight module 3 '' including: diffusion sheet 31'', multilayer film polarizer 32'', ⁇ /4 wave plate 33'', light source 34'', light guide plate 35'' and reflection sheet 36''; the diffusion sheet 31" is arranged under the liquid crystal layer 2", which is directly opposite to the ordinary polarizer 1"; the multilayer film polarizer 32" is composed of at least one film and is arranged on the diffuser 31" directly below; the ⁇ /4 wave plate 33" is disposed between the multilayer film polarizer 32" and the light guide plate 35", and the light guide plate 35" and all
  • the multilayer film polarizer 32'' is made of polyethylene terephthalate or polyvinyl alcohol polymer plastic material with good light transmittance.
  • the number of layers of the multilayer film polarizer 32'' provided in this application needs to be greater than 500, but the total thickness does not exceed 100um, and the multilayer film polarizer 32'' per The film thickness is 95-195 nm.
  • the light guide plate 35'' has a flat front surface and a bottom dot surface.
  • the size of the dot surface, the spacing between the dots, and the depth of the dots can be adjusted so that the reflected light
  • a ⁇ /4 wave plate 33'' needs to be pasted on the light guide plate 35'', and the ⁇ /4 wave plate 33'' is a phase difference plate, which is made of polymer material.
  • Methyl methacrylate or polyethylene terephthalate is made by uniaxial stretching. When stretched, the film molecules are aligned, showing a birefringence effect.
  • the thickness of the film is ⁇ /4 (ne-no)
  • the phase difference of the transmitted light in the o and e directions is ⁇ /2.
  • the light polarization direction is at an angle of 45° to the o and e axes, the effect is to change linearly polarized light into circularly polarized light and circularly polarized light into linearly polarized light.
  • the ordinary polarizer 1 ′′ uses an iodine-type polyvinyl alcohol type polarizer, and the polarization direction of the ordinary polarizer 1 ′′ is perpendicular to the multilayer film polarizer 32 ′ 'Direction.

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Abstract

一种液晶显示装置，包括：普通偏光片、液晶层以及背光模组；其背光模组包括：扩散片、多层膜偏光片、ℷ/4波片、光源、导光板以及反射片；扩散片设置在液晶层下方；多层膜偏光片由多层膜片组成，设置在扩散片的正下方；ℷ/4波片设置在多层膜偏光片与导光板之间；导光板设置在ℷ/4波片下方；反射片设置在导光板的下方。

Description

液晶显示装置 技术领域
本申请涉及显示领域，特别是涉及一种液晶显示装置。
 背景技术
薄膜晶体管液晶显示器（TFT-LCD，thin film transistor-liquid crystal display）具有耗电量小、对比度高、节省空间等优点，已成为市场上最主流的显示装置。薄膜晶体管液晶显示器依次设置有背光源、背光侧偏振片、薄膜晶体管、液晶单元、彩膜基板及显示侧偏振片等结构。近年来，在薄膜晶体管液晶显示器中，正在推进用于节省电力化、高清晰化及提高色再现性的项目开发。其中提高透过率能提升薄膜晶体管液晶显示器的亮度、减少电力损耗，是目前全世界各家面板厂都在攻克的难关。
薄膜晶体管液晶显示器的透光率是指背光源透过薄膜晶体管液晶显示面板前后的光强之比。通常情况下薄膜晶体管液晶显示器的透光率只有3%-10%，即超过90%的光是无法得到利用的。
因此，现有的薄膜晶体管液晶显示器技术中，还存在液晶显示面板透光率低，大量入射光得不到利用的问题，急需改进。
 技术问题
本申请涉及一种液晶显示装置，用于解决现有技术中存在的液晶显示面板透光率低，大量入射光得不到利用的问题。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
根据本申请提供的一种液晶显示装置，包括：普通偏光片、液晶层以及背光模组；
所述普通偏光片设置在彩膜基板上；
所述液晶层设置在所述普通偏光片的下方，所述普通偏光片与所述背光模组之间；
所述背光模组又包括：扩散片、多层膜偏光片、ℷ/4波片、光源、导光板以及反射片；
所述扩散片设置在所述液晶层下方，正对于所述普通偏光片设置；
所述多层膜偏光片由至少一层膜片组成，设置在所述扩散片的正下方；
所述ℷ/4波片设置在所述多层膜偏光片与所述导光板之间；
所述导光板设置在所述ℷ/4波片下方，所述导光板正面为平面，底面为网点面。
所述反射片设置在所述导光板的下方，所述背光模组的底端。
根据本申请提供的一优选实施例，所述背光模组为侧入式背光模组或是直下式背光模组。
根据本申请提供的一优选实施例，所述多层膜偏光片采用聚对苯二甲酸乙二酯或是聚乙烯醇高分子塑料材料。
根据本申请提供的一优选实施例，所述多层膜偏光片的层数大于500层。
根据本申请提供的一优选实施例，所述多层膜偏光片总厚度不超过100um。
根据本申请提供的一优选实施例，所述多层膜偏光片每层膜厚度为95-195 nm。
根据本申请提供的一优选实施例，所述扩散片采用高分子材料聚对苯二甲酸乙二醇酯或是聚碳酸酯作为基材，亚克力树脂材料作为扩散层和保护层。
根据本申请提供的一优选实施例，所述扩散层中的扩散粒子为粒径不规则的聚甲基丙烯酸甲酯。
根据本申请提供的一优选实施例，所述ℷ/4波片采用高分子材料聚甲基丙烯酸甲酯或是聚对苯二甲酸乙二醇酯制成。
根据本申请提供的一优选实施例，所述普通偏光片采用碘类聚乙烯醇型偏光片。
根据本申请提供的一优选实施例，所述普通偏光片的偏振方向垂直于所述多层膜偏光片的方向。
本申请还提供另一种液晶显示装置，包括：普通偏光片、液晶层以及背光模组；
所述普通偏光片设置在彩膜基板上；
所述液晶层设置在所述普通偏光片的下方，所述普通偏光片与所述背光模组之间；
所述背光模组又包括：扩散片、多层膜偏光片、ℷ/4波片、光源、导光板以及反射片；
所述扩散片设置在所述液晶层下方，正对于所述普通偏光片设置；
所述多层膜偏光片由至少一层膜片组成，设置在所述扩散片的正下方；
所述ℷ/4波片设置在所述多层膜偏光片与所述导光板之间；
所述导光板设置在所述ℷ/4波片下方；
所述反射片设置在所述导光板的下方，所述背光模组的底端。
根据本申请提供的一优选实施例，所述背光模组为侧入式背光模组或是直下式背光模组。
根据本申请提供的一优选实施例，所述多层膜偏光片采用聚对苯二甲酸乙二酯或是聚乙烯醇高分子塑料材料。
根据本申请提供的一优选实施例，所述多层膜偏光片的层数大于500层。
根据本申请提供的一优选实施例，所述多层膜偏光片总厚度不超过100um。
根据本申请提供的一优选实施例，所述多层膜偏光片每层膜厚度为95-195 nm。
根据本申请提供的一优选实施例，所述扩散片采用高分子材料聚对苯二甲酸乙二醇酯或是聚碳酸酯作为基材，亚克力树脂材料作为扩散层和保护层。
根据本申请提供的一优选实施例，所述扩散层中的扩散粒子为粒径不规则的聚甲基丙烯酸甲酯。
根据本申请提供的一优选实施例，所述ℷ/4波片采用高分子材料聚甲基丙烯酸甲酯或是聚对苯二甲酸乙二醇酯制成。
 有益效果
与现有技术相比，本申请将阵列基板侧的碘类聚乙烯醇型偏光片替换成多层膜结构偏光片，调节导光板的结构使入射光以布鲁斯特角入射，同时在多层膜与导光板之间加入λ/4波片。相比于碘类聚乙烯醇型偏光片，本申请提出的折射型偏光片能使自然光变为偏振光透过，同时将未通过多层膜的光改变偏振方向后透过，从而大大提高了光的透过率。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，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为本申请实施例提供的阵列基板上增设了双亮度强化膜的液晶显示装置。
图2为本申请实施例提供的液晶显示装置中多层膜偏光片光线传播路线图。
图3为本申请实施例提供的液晶显示装置中光线进入多层膜偏光片的结构图。
图4为本申请实施例提供的液晶显示装置中导光板的第一出光线路图。
图5为本申请实施例提供的液晶显示装置的第一结构示意图。
图6为本申请实施例提供的液晶显示装置中导光板的第二出光线路图。
图7为本申请实施例提供的液晶显示装置的第二结构示意图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请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申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本申请的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，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申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
本申请提供一种液晶显示装置，具体参阅图1-7。
在薄膜晶体管液晶显示面板中阵列基板和彩膜基板上都有偏光片，在液晶的作用下两层偏光片的最大透过率也仅为40%。就偏光片而言，目前常用的是碘类聚乙烯醇（PVA）型偏光片，其偏光原理是碘分子吸收与吸光轴平行的偏振光，透过与吸光轴垂直的偏振光。理论上，此种偏光片的最大透过率为50%，然而由于制造工艺等原因，其透过率往往小于45%。
参阅图1，为了解决液晶显示面板透光率低的问题，我们可以从偏光片上进行改进，现有一种提高偏光片入射光的方式，即在背光模组与阵列基板偏光片之间设置特定的双亮度强化膜(DBEF，dual brightness enhancement film)，利用光循环来提高其透过率。双亮度强化膜是一种多层膜结构，在100 um的厚度中集成了800层不同厚度、不同折射率的薄膜。如果调整双亮度强化膜32的通光轴与阵列基板上偏光片31的偏振方向一致，平行于偏光片31的光会通过双亮度强化膜32，垂直于偏光片31的光会先被双亮度强化膜32反射，再经背光模组3底部的反射片35反射，改变偏振方向后再次通过双亮度强化膜32。双亮度强化膜32能将整个背光模组3的整体亮度提升40%-45%。
这种双亮度强化膜32的核心原理是通过改变光的偏振态以提高光的反射作用。在实际情况下，光需要以特定角度射入到双亮度强化膜32中才能达到较高的偏振态选择作用。此外，经双亮度强化膜32反射的光偏振方向也不会明显改变，需要经过多次反射后才能透过，因此在通过阵列基板上的偏光片31前仍会存在很大的损耗。
借鉴双亮度强化膜能选择性反射偏振光的原理，本申请设计一种新型液晶显示装置，采用多层膜偏光片结构替代阵列基板上的偏光片，通过调节导光板的结构，同时配合在多层膜偏光片与导光板之间加入的λ/4波片，使入射光以布鲁斯特角入射到多层膜偏光片中。
由布鲁斯特定理可知，入射光以某一角度θ（满足tanθ=n，n为多层膜的折射率）入射到透明介质中时，反射光为偏振方向垂直于入射面的偏振光（即S分量），透射光为部分偏振光。当多层膜叠加在一起，自然光以布鲁斯特角入射时，光线每遇到一个界面，透射光为偏振方向平行于入射面的偏振光（即P分量）100%透射，而约有15%的光线发生S分量的反射，参阅图2。经过多次反射和折射，反射光都是S分量线偏振光，透射光几乎就都是P分量线偏振光，因此该多层膜能作为偏光片使用。再在背光源与下部反射片之间加入λ/4波片，并调节λ/4波片的o光轴和e光轴与S分量成45°角。多层膜反射的S分量经过λ/4波片后变为左旋（或右旋）圆偏振光，再经背光模组下部的反射片反射后变为右旋（或左旋）圆偏振光，再通过λ/4波片后变为P分量线偏振光。即该液晶显示装置的工作原理是将进入多层膜偏光片的自然光转变成偏振光透过，λ/4波片使未通过多层膜偏光片的光改变偏振方向后再透过，使其透过率达到100%。
实施例一
参阅图5，本申请提供的一种液晶显示装置，包括：普通偏光片1’、液晶层2’以及背光模组3’；所述普通偏光片1’设置在彩膜基板上；所述液晶层2’设置在所述普通偏光片1’的下方，所述普通偏光片1’与所述背光模组3’之间；所述背光模组3’又包括：扩散片31’、多层膜偏光片32’、ℷ/4波片33’、光源34’、导光板35’以及反射片36’；所述扩散片31’设置在所述液晶层2’下方，正对于所述普通偏光片1’设置；所述多层膜偏光片32’由至少一层膜片组成，设置在所述扩散片31’的正下方；所述ℷ/4波片33’设置在所述多层膜偏光片32’与所述导光板35’之间，与所述导光板35’和所述反射片36’一起作用，将线偏振光转变成圆偏振光，圆偏振光转变成线偏振光；所述光源34’用于提供光线，设置在所述导光板35’一侧或所述导光板35’的下方；所述导光板35’设置在所述ℷ/4波片33’下方；所述反射片36’设置在所述导光板35’的下方，所述背光模组3’的底端。本实施例中所述的背光模组3’为侧入式背光模组，所述背光源34’设置在所述导光板35’的左侧。
根据本申请提供的一优选实施例，所述多层膜偏光片采用透光性良好的聚对苯二甲酸乙二酯或是聚乙烯醇高分子塑料材料。同时，为了获得良好的偏光性能，本申请提供的所述多层膜偏光片的层数需大于500层，但总厚度不超过100um，且所述多层膜偏光片每层膜厚度为95-195 nm。
根据本申请提供的一优选实施例，所述多层膜偏光片32’上需要贴上一面扩散片31’，所述扩散片31’采用高分子材料聚对苯二甲酸乙二醇酯或是聚碳酸酯作为基材，亚克力树脂313’材料作为扩散层和保护层。所述扩散层中的扩散粒子为粒径不规则的聚甲基丙烯酸甲酯311’的透明颗粒。其作用主要是为了扩散光线，将多层膜偏光片32’折射出来的特定方向的光线雾化，使光线更加均匀、细腻。参阅图3，从下至上，观看进入多层膜偏光片32’和扩散片31’中的光线。
参阅图4，所述导光板35’正面为平面，底面为网点面，所述网点面的大小，所述网点之间的间距以及所述网点的深度均可进行调节，以使得被反射的光进入到多层膜偏光片中的入射角为布鲁斯入射角，即入射角θ满足：tanθ=n，其中，n为多层膜的折射率。
根据本申请提供的一优选实施例，需要在所述导光板35’上贴上ℷ/4波片33’，ℷ/4波片33’即为相位差板，采用高分子材料聚甲基丙烯酸甲酯或是聚对苯二甲酸乙二醇酯沿着单轴拉伸制成。在拉伸时薄膜分子实现配向，呈现出双折射效果。当薄膜的厚度为λ/4(ne-no)时，透过光在o和e方向相位相差π/2。当光偏振方向与o和e轴呈45°角时，其效果是将线偏振光变为圆偏振光，将圆偏振光变为线偏振光。
根据本申请提供的一优选实施例，所述普通偏光片1’采用碘类聚乙烯醇型偏光片，所述普通偏光片1’的偏振方向垂直于所述多层膜偏光片32’的方向。
实施例二
参阅图6和图7，本申请提供的一种液晶显示装置，包括：普通偏光片1’’、液晶层2’’以及背光模组3’’；所述普通偏光片1’’设置在彩膜基板上；所述液晶层2’’设置在所述普通偏光片1’’的下方，所述普通偏光片1’’与所述背光模组3’’之间；所述背光模组3’’又包括：扩散片31’’、多层膜偏光片32’’、ℷ/4波片33’’、光源34’’、导光板35’’以及反射片36’’；所述扩散片31’’设置在所述液晶层2’’下方，正对于所述普通偏光片1’’设置；所述多层膜偏光片32’’由至少一层膜片组成，设置在所述扩散片31’’的正下方；所述ℷ/4波片33’’设置在所述多层膜偏光片32’’与所述导光板35’’之间，与所述导光板35’’和所述反射片36’’一起作用，将线偏振光转变成圆偏振光，圆偏振光转变成线偏振光；所述光源34’’用于提供光线，设置在所述导光板35’’一侧或所述导光板35’’的下方；所述导光板35’’设置在所述ℷ/4波片33’’下方；所述反射片36’’设置在所述导光板35’’的下方，所述背光模组3’’的底端。本实施例中所述的背光模组3’’为直下式背光模组，所述背光源34’’设置在所述导光板35’’下方。
根据本申请提供的一优选实施例，所述多层膜偏光片32’’采用透光性良好的聚对苯二甲酸乙二酯或是聚乙烯醇高分子塑料材料。同时，为了获得良好的偏光性能，本申请提供的所述多层膜偏光片32’’的层数需大于500层，但总厚度不超过100um，且所述多层膜偏光片32’’每层膜厚度为95-195 nm。
参阅图4，所述导光板35’’正面为平面，底面为网点面，所述网点面的大小，所述网点之间的间距以及所述网点的深度均可进行调节，以使得被反射的光进入到多层膜偏光片32’’中的入射角为布鲁斯入射角，即入射角θ满足：tanθ=n，其中，n为多层膜的折射率。
根据本申请提供的一优选实施例，需要在所述导光板35’’上贴上ℷ/4波片33’’，ℷ/4波片33’’即为相位差板，采用高分子材料聚甲基丙烯酸甲酯或是聚对苯二甲酸乙二醇酯沿着单轴拉伸制成。在拉伸时薄膜分子实现配向，呈现出双折射效果。当薄膜的厚度为λ/4(ne-no)时，透过光在o和e方向相位相差π/2。当光偏振方向与o和e轴呈45°角时，其效果是将线偏振光变为圆偏振光，将圆偏振光变为线偏振光。
根据本申请提供的一优选实施例，所述普通偏光片1’’采用碘类聚乙烯醇型偏光片，所述普通偏光片1’’的偏振方向垂直于所述多层膜偏光片32’’的方向。
以上对本申请实施例所提供的一种液晶显示装置进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (20)

  1. 一种液晶显示装置，其包括：普通偏光片、液晶层以及背光模组；
    所述普通偏光片设置在彩膜基板上；
    所述液晶层设置在所述普通偏光片的下方，所述普通偏光片与所述背光模组之间；
    所述背光模组又包括：扩散片、多层膜偏光片、ℷ/4波片、光源、导光板以及反射片；
    所述扩散片设置在所述液晶层下方，正对于所述普通偏光片设置；
    所述多层膜偏光片由至少一层膜片组成，设置在所述扩散片的正下方；
    所述ℷ/4波片设置在所述多层膜偏光片与所述导光板之间;
    所述导光板设置在所述ℷ/4波片下方，所述导光板正面为平面，底面为网点面。
    所述反射片设置在所述导光板的下方，所述背光模组的底端。
  2. 根据权利要求1所述的液晶显示装置，其所述背光模组为侧入式背光模组或是直下式背光模组。
  3. 根据权利要求1所述的液晶显示装置，其所述多层膜偏光片采用聚对苯二甲酸乙二酯或是聚乙烯醇高分子塑料材料。
  4. 根据权利要求3所述的液晶显示装置，其所述多层膜偏光片的层数大于500层。
  5. 根据权利要求4所述的液晶显示装置，其所述多层膜偏光片总厚度不超过100um。
  6. 根据权利要求4所述的液晶显示装置，其所述多层膜偏光片每层膜厚度为95-195 nm。
  7. 根据权利要求1所述的液晶显示装置，其所述扩散片采用高分子材料聚对苯二甲酸乙二醇酯或是聚碳酸酯作为基材，亚克力树脂材料作为扩散层和保护层。
  8. 根据权利要求6所述的液晶显示装置，其所述扩散层中的扩散粒子为粒径不规则的聚甲基丙烯酸甲酯。
  9. 根据权利要求1所述的液晶显示装置，其所述ℷ/4波片采用高分子材料聚甲基丙烯酸甲酯或是聚对苯二甲酸乙二醇酯制成。
  10. 根据权利要求1所述的液晶显示装置，其所述普通偏光片采用碘类聚乙烯醇型偏光片。
  11. 根据权利要求9所述的液晶显示装置，其所述普通偏光片的偏振方向垂直于所述多层膜偏光片的方向。
  12. 一种液晶显示装置，其包括：普通偏光片、液晶层以及背光模组；
    所述普通偏光片设置在彩膜基板上；
    所述液晶层设置在所述普通偏光片的下方，所述普通偏光片与所述背光模组之间；
    所述背光模组又包括：扩散片、多层膜偏光片、ℷ/4波片、光源、导光板以及反射片；
    所述扩散片设置在所述液晶层下方，正对于所述普通偏光片设置；
    所述多层膜偏光片由至少一层膜片组成，设置在所述扩散片的正下方；
    所述ℷ/4波片设置在所述多层膜偏光片与所述导光板之间;
    所述导光板设置在所述ℷ/4波片下方；
    所述反射片设置在所述导光板的下方，所述背光模组的底端。
  13. 根据权利要求12所述的液晶显示装置，其所述背光模组为侧入式背光模组或是直下式背光模组。
  14. 根据权利要求12所述的液晶显示装置，其所述多层膜偏光片采用聚对苯二甲酸乙二酯或是聚乙烯醇高分子塑料材料。
  15. 根据权利要求14所述的液晶显示装置，其所述多层膜偏光片的层数大于500层。
  16. 根据权利要求15所述的液晶显示装置，其所述多层膜偏光片总厚度不超过100um。
  17. 根据权利要求15所述的液晶显示装置，其所述多层膜偏光片每层膜厚度为95-195 nm。
  18. 根据权利要求12所述的液晶显示装置，其所述扩散片采用高分子材料聚对苯二甲酸乙二醇酯或是聚碳酸酯作为基材，亚克力树脂材料作为扩散层和保护层。
  19. 根据权利要求17所述的液晶显示装置，其所述扩散层中的扩散粒子为粒径不规则的聚甲基丙烯酸甲酯。
  20. 根据权利要求12所述的液晶显示装置，其所述ℷ/4波片采用高分子材料聚甲基丙烯酸甲酯或是聚对苯二甲酸乙二醇酯制成。
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