WO2013149410A1 - 液晶显示装置 - Google Patents

液晶显示装置 Download PDF

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Publication number
WO2013149410A1
WO2013149410A1 PCT/CN2012/073880 CN2012073880W WO2013149410A1 WO 2013149410 A1 WO2013149410 A1 WO 2013149410A1 CN 2012073880 W CN2012073880 W CN 2012073880W WO 2013149410 A1 WO2013149410 A1 WO 2013149410A1
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WO
WIPO (PCT)
Prior art keywords
prism
liquid crystal
sheet
disposed
substrate
Prior art date
Application number
PCT/CN2012/073880
Other languages
English (en)
French (fr)
Inventor
张光耀
苏赞加
Original Assignee
深圳市华星光电技术有限公司
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Filing date
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/515,808 priority Critical patent/US8917366B2/en
Publication of WO2013149410A1 publication Critical patent/WO2013149410A1/zh

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Classifications

    • 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
    • G02F1/133528—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
    • G02F1/1336—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
    • 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 invention relates to the field of liquid crystal display, and in particular to a liquid crystal display device. Background technique
  • Liquid crystal display has many advantages such as thin body, power saving, and no radiation, and has been widely used.
  • Most of the liquid crystal display devices on the market are backlight type liquid crystal display devices, which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates, and the liquid crystal molecules are controlled to change direction by energization or not, and the light of the backlight module is refracted. Come out to produce the picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module is required to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the light source.
  • a light source such as a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode) is disposed behind the liquid crystal panel, and a surface light source is directly formed and supplied to the liquid crystal panel.
  • the side-lit backlight module has a backlight LED strip (Light bar) disposed on the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip is lighted from the side of the light guide plate (LGP, Light Guide Plate). The surface enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and is supplied to the liquid crystal panel through the optical film group to form a surface light source.
  • LGP Light Guide Plate
  • the liquid crystal panel is directly disposed on the backlight module opposite to the optical film group.
  • the conventional optical film set generally includes: a lower diffusion sheet, a prism sheet disposed on the lower diffusion sheet, and an upper diffusion sheet disposed on the prism sheet.
  • the lower diffusion sheet mainly concentrates the light emitted from the light guide plate and is projected onto the diffusion sheet.
  • the main function of the upper diffuser is to atomize the light emitted by the prism sheet, and to illuminate the light to eliminate the side lobe light pattern, thereby eliminating the bright and dark under the specific viewing angle.
  • the problem of the average (the front view is bright, the side is bright, and the two are dark).
  • the use of the upper diffusion sheet reduces the luminance gain effect to a certain extent.
  • the luminance gain of 10% can be improved, and the optical film for removing the upper diffusion sheet can be improved.
  • the group structure is mainly applied to small-sized displays with low optical grade requirements, such as notebook monitors or desktop monitors.
  • small-size liquid crystal displays in order to avoid multi-view viewing, in order to avoid the uneven brightness problem, it is necessary to eliminate the side protrusions, which necessitates the use of the upper diffusion sheet, in order to reduce the brightness gain, in exchange for the brightness balance, and to increase the large size.
  • the optical grade of liquid crystal displays is a technical consensus that has always existed in the industry. Summary of the invention
  • the present invention provides a liquid crystal display device, including: a backlight module and a liquid crystal panel on the backlight module, the backlight module includes an optical film set, and the optical film set includes a first a prism sheet, the liquid crystal panel includes a first polarizer, the first polarizer is directly disposed facing the first prism sheet, and the first prism sheet includes a first substrate and an upper surface of the first substrate A plurality of first prisms arranged in parallel have an angle between an axial direction of the first prisms and a polarization direction of the first polarizer.
  • the angle between the axial direction of the first prism and the polarization direction of the first polarizer is 50 ° ⁇
  • the lower surface of the first substrate of the first prism sheet is an atomized surface that is atomized.
  • the atomization treatment method is frosting, sand blasting, or silk screen printing.
  • the haze of the lower surface of the first substrate after atomization treatment is 10% to 40%.
  • the optical film set further includes a diffusion sheet located below the first prism sheet.
  • the optical film set further includes a second prism sheet disposed between the first prism sheet and the diffusion sheet, the second prism sheet including a second substrate and a plurality of parallel arranged on the upper surface of the second substrate The second prism, the axial direction of the second prism is perpendicular to the axial direction of the first prism.
  • the first prism is a triangular prism, which is gradually narrowed upward from the upper surface of the first substrate, and further forms a sharp corner on the top of the first prism;
  • the second prism is a triangular prism, which is composed of the upper surface of the second substrate. The upper portion is gradually narrowed, and the top of the second prism is rounded.
  • the liquid crystal panel further includes a first glass substrate disposed on the first polarizer, a second glass substrate disposed on the first glass substrate, a liquid crystal disposed between the first and second glass substrates, and a second glass a second polarizer on the substrate.
  • the backlight module further includes a back plate, a reflective sheet disposed in the back plate, a light guide plate disposed on the reflective sheet, a backlight disposed in the back plate, and a plastic frame disposed on the back plate, the optical film
  • the sheet group is located on the light guide plate, and the liquid crystal panel is disposed on the plastic frame.
  • the liquid crystal display device of the present invention removes the most existing optical film group
  • the upper diffusion sheet reduces the production cost
  • the first prism sheet at the top of the optical film group and the first polarizer at the bottom of the liquid crystal panel are disposed at an angle, thereby improving the transmittance of the liquid crystal display device and improving the liquid crystal panel.
  • the brightness unevenness of the display is applied to form a certain haze on the side of the first prism sheet away from the first polarizer, thereby eliminating the side protrusion light pattern of the image, thereby improving the optical grade of the large-size liquid crystal display device.
  • FIG. 1 is a schematic structural view of a liquid crystal display device of the present invention
  • FIG. 2 is a perspective exploded view of a first prism sheet and a first polarizer in the liquid crystal display device of the present invention
  • 3 is an optical path diagram of light passing through the first prism sheet and the first polarizer
  • FIG. 4 is a waveform diagram of brightness of a viewing angle corresponding to an angle between an axial direction of a first prism of a first prism sheet and a polarization direction of the first polarizer;
  • Figure 5 is the angle between the axial direction of the first prism of the first prism sheet and the polarization direction of the first polarizer is
  • the viewing angle brightness waveform of the front side of the first prism sheet at 4% and 30%, respectively;
  • Fig. 6 is an exploded perspective view showing an embodiment of an optical film group in the liquid crystal display device of the present invention. detailed description
  • the liquid crystal display device of the present invention comprises: a backlight module 2 and a liquid crystal panel 4 on the backlight module 2 , the backlight module 2 includes an optical film set 20 , and the optical film
  • the group 20 includes a first prism sheet 22, and the liquid crystal panel 4 includes a first polarizer 42.
  • the first polarizer 42 is directly disposed facing the first prism sheet 22.
  • the first prism sheet 22 includes a substrate 222 and a plurality of first prisms 224 arranged in parallel on the upper surface of the first substrate 222.
  • the axial direction of the first prisms 224 and the polarization direction of the first polarizer 42 have an angle ⁇ .
  • the angle ⁇ is 50° to 90°, preferably 60°.
  • the light wave is a transverse wave
  • the direction of vibration of the light wave is perpendicular to the direction of propagation
  • the light is divided into a P component whose vibration direction is in a plane formed by the incident light and the normal line and an S component which is perpendicular to a plane formed by the incident light and the normal line, and the P component is consistent with the polarization direction of the first polarizer 42, and can be worn.
  • the first polarizer 42 is perpendicular to the polarization direction of the first polarizer 42 and is absorbed by the first polarizer 42 and cannot pass through the first polarizer 42.
  • the light is emitted from the lower surface of the first prism sheet 22.
  • the first prism sheet 22 is refracted when the upper surface of the first prism sheet 22 is emitted. Since the P component and the S component of the light have different incident angles, the reflectance and the refractive index are different, when the first prism sheet 22 is different.
  • the axial direction of the first prism 224 is perpendicular to the polarization direction of the first polarizer 42, the light is refracted through the upper surface of the first prism sheet 22, and the light P component is more likely to be refracted than the S component, thereby generating partial light polarization.
  • the P component is consistent with the polarization direction of the first polarizer 42, and is transparent to the first polarizer 42, and the first polarizer 42 has the highest transmittance, that is, the luminance of the liquid crystal panel is the largest.
  • DF is a diffusion sheet
  • Prism(O) is a sharp-angle prism sheet (the apex angle of the prism of the prism sheet is a sharp angle)
  • LTC(O) is a rounded prism sheet (the apex angle of the prism of the prism sheet is rounded) and the angle between the axial direction of the prism of the rounded prism and the polarization direction of the polarizer.
  • the optical film group includes: a first diffusion sheet, a sharp-angled first prism sheet disposed on the first diffusion sheet, and a second diffusion sheet disposed on the sharp-angle prism sheet, the tip
  • the axial direction of the first prism of the angular first prism sheet is perpendicular to the polarization direction of the first polarizer, and the transmittance of the first polarizer under the frame is set to 100% as a reference for comparison.
  • the optical film group includes: a first diffusion sheet and a sharp-angle type first prism sheet disposed on the first diffusion sheet, wherein an axial direction of the first prism sheet is parallel to the first One
  • the polarization direction of the polarizer, the transmittance of the first polarizer under the structure is 110.9%.
  • the optical film group includes: a first diffusion sheet and a sharp-point type first prism sheet disposed on the first diffusion sheet, wherein an axial direction of the first prism sheet is perpendicular to the first
  • the polarization direction of a polarizer, the transmittance of the first polarizer under the architecture is 115.7 %, which is 104.3 % of the transmittance of the structure 2.
  • the optical film group includes: a first diffusion sheet and a rounded first prism sheet disposed on the first diffusion sheet, wherein an axial direction of the first prism sheet is parallel to the first The polarization direction of a polarizer, the transmittance of the first polarizer under the structure is 102.1%.
  • the optical film group comprises: a first diffusion sheet and a rounded first prism sheet disposed on the first diffusion sheet, wherein an axial direction of the first prism sheet is perpendicular to the first
  • the polarization direction of a polarizer, the transmittance of the first polarizer under the structure is 109.5 %, which is 107.3 % of the transmittance of the structure 4;
  • the optical film set includes: a first diffusion sheet, a pointed first prism sheet disposed on the first diffusion sheet, and a rounded type disposed on the pointed first prism sheet a prism sheet, wherein an axial direction of the first prism of the pointed first prism sheet is perpendicular to a polarization direction of the first polarizer, and an axial direction of the second prism of the rounded second prism sheet Parallel to the polarization direction of the first polarizer, the transmittance of the first polarizer under the structure is 128.5 %;
  • the optical film group includes: a first diffusion sheet, a pointed first prism sheet disposed on the first diffusion sheet, and a rounded type disposed on the pointed first prism sheet a prism sheet, wherein an axial direction of the first prism of the pointed first prism sheet is parallel to a polarization direction of the first polarizer, and an axial direction of the second prism of the rounded second prism sheet Vertically perpendicular to the polarization direction of the first polarizer, the transmittance of the first polarizer under the structure is 136.5 %, which is 106.2% of the transmittance of the structure 6;
  • the optical film group includes: a first diffusion sheet, a sharp-point type first prism sheet disposed on the first diffusion sheet, and a sharp-angle type provided on the pointed-angle first prism sheet a prism sheet, wherein an axial direction of the first prism of the pointed first prism sheet is perpendicular to a polarization direction of the first polarizer, and an axial direction of the second prism of the pointed second prism sheet Parallel to the polarization direction of the first polarizer, the transmittance of the first polarizer under the framework is 145.5 %;
  • the optical film group includes: a first diffusion sheet, a sharp-point type first prism sheet disposed on the first diffusion sheet, and a sharp-angle type provided on the pointed-angle first prism sheet a prism sheet, wherein an axial direction of the first prism of the pointed first prism sheet is parallel to a polarization direction of the first polarizer, and an axial direction of the second prism of the pointed second prism sheet
  • the transmittance of the first polarizer under the structure is 152.2%, which is 104.6 % of the transmittance of the structure 8, perpendicular to the polarization direction of the first polarizer.
  • the transmittance of the first polarizer is higher, and compared with the structure 6 and the structure 7 and the structure 8 and the structure 9, it can be seen that when the first prism of the first prism is When the axial direction is perpendicular to the polarization direction of the first polarizer, the first polarizer has the highest light transmittance.
  • the first prism sheet has a rotation angle of less than 40.
  • the axial direction of the first prism of the first prism sheet is at an angle of 50 with the polarization direction of the first polarizer. ⁇ 90.
  • the brightness and brightness of the liquid crystal panel can be ensured at the same time, and the rotation angle of the first prism sheet is 30. That is, the angle between the axial direction of the first prism of the first prism sheet and the polarization direction of the first polarizer is 60. , to achieve the best results.
  • the lower surface of the first substrate 222 of the first prism sheet 22 is an atomized surface that is atomized, and the atomization treatment method is frosting, sand blasting, or silk screen printing, and the first The haze of the lower surface of the substrate 222 after atomization is 10% to 40%.
  • the haze of the back surface of the first prism sheet is 4% and 30%, respectively.
  • the optical film set 20 further includes a first A diffusion sheet 24 under the prism sheet 22 and a second prism sheet 26 disposed between the first prism sheet 22 and the diffusion sheet 24, the second prism sheet 26 includes a second substrate 262 and a second substrate 262 a plurality of second prisms 264 arranged in parallel on the upper surface, the axial directions of the second prisms 264 are perpendicular to the axial direction of the first prisms 224 (the angle is 90°), and the first prisms 224 are triangular prisms.
  • the upper surface of the first substrate 222 is gradually narrowed upward, and a sharp corner is formed on the top of the first prism 224.
  • the second prism 264 is a triangular prism which is gradually narrowed upward from the upper surface of the second substrate 262.
  • the top of the second prism 264 is a rounded corner.
  • the structure of the optical film set 20 is only an example, and the first and second prisms 224 and 264 of the first and second prism sheets 22 and 26 may be sharp-edged triangular prisms or may be rounded.
  • the first prism 224 of the triangular prism or the first prism sheet 22 is a rounded triangular prism
  • the second prism 264 of the second 26 prism sheet is a pointed triangular prism, or the like, and only the first prism sheet 22 may be disposed.
  • Prism The first prism 224 of the sheet 22 can also be a rounded corner, or a pointed triangular prism.
  • the liquid crystal display device of the present invention removes the diffusion sheet of the uppermost layer of the existing optical film group, and reduces the production cost.
  • the first prism sheet at the top of the optical film group and the first polarized light at the bottom of the liquid crystal panel are The sheet is disposed at a certain angle, which improves the light transmittance of the liquid crystal display device, improves the unevenness of the display of the liquid crystal panel, and forms a certain haze on the side of the first prism sheet away from the first polarizer to eliminate the side of the image.
  • the light type is highlighted, thereby improving the optical grade of the large-sized liquid crystal display device.

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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)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

一种液晶显示装置，包括：背光模组（2）及位于背光模组（2）上的液晶面板（4），所述背光模组（2）包括一光学膜片组（20），所述光学膜片组（20）包括第一棱镜片（22），所述液晶面板（4）包括第一偏光片（42），所述第一偏光片（42）直接面对该第一棱镜片（22）设置，所述第一棱镜片（22）包括第一基板（222）及设于第一基板（222）上表面的数条平行排列的第一棱柱（224），该些第一棱柱（224）的轴向方向与第一偏光片（42）的偏振方向之间具有一夹角。本液晶显示装置，去掉了现有光学膜片组最上层的扩散片，降低生产成本，将处于光学膜片组（20）最上方的第一棱镜片（22）与液晶面板（24）最下方的第一偏光片（42）呈一定角度设置，提高了液晶显示装置的透光率，改善液晶面板显示的亮暗不均，在第一棱镜片（22）远离第一偏光片（42）的一面涂布形成一定的雾度，提高光学品级。

Description

液晶显示装置 技术领域
本发明涉及液晶显示领域， 尤其涉及一种液晶显示装置。 背景技术
液晶显示装置（LCD, Liquid Crystal Display )具有机身薄、 省电、 无 辐射等众多优点， 得到了广泛的应用。 现有市场上的液晶显示装置大部分 为背光型液晶显示装置， 其包括液晶面板及背光模组 （ backlight module ) 。 液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分 子， 两片玻璃基板中间有许多垂直和水平的细小电线， 通过通电与否来控 制液晶分子改变方向， 将背光模组的光线折射出来产生画面。 由于液晶面 板本身不发光， 需要借由背光模组提供的光源来正常显示影像， 因此， 背 光模组成为液晶显示装置的关键零组件之一。 背光模组依照光源入射位置 的不同分成侧入式背光模组与直下式背光模组两种。 直下式背光模组是将 发光光源例如 CCFL(Cold Cathode Fluorescent Lamp , 阴极萤光灯管）或 LED(Light Emitting Diode发光二极管)设置在液晶面板后方， 直接形成面 光源提供给液晶面板。 而侧入式背光模组是将背光源 LED 灯条（Light bar )设于液晶面板侧后方的背板边缘， LED 灯条发出的光线从导光板 ( LGP , Light Guide Plate ) 一侧的入光面进入导光板， 经反射和扩散后 从导光板出光面射出， 在经由光学膜片组， 以形成面光源提供给液晶面 板。
不论是直下式背光模组还是侧入式背光模组， 其均设有光学膜片组。 而液晶面板直接对着该光学膜片组设置于背光模组上。 现有的光学膜片组 一般包括： 下扩散片、 设于下扩散片上的棱镜片及设于棱镜片上的上扩散 片， 下扩散片主要是将从导光板发出的光集中起来均勾投射到棱镜片上， 而上扩散片的主要作用是将棱镜片射出的光雾化， 并将光均勾透出， 消除 侧突出（side lobe)的光型， 进而消除在特定视角观察下有亮暗不均的问题 (正视角亮， 侧突出亮， 两者之间暗)。 然而， 该上扩散片的使用却在一定 程度上降低了辉度增益效果， 实验证明， 如果将上扩散片去除， 则可提升 10%的辉度增益， 这种去除上扩散片的光学膜片组结构， 主要应用在光学 品级（Optical grade )要求较低的小尺寸显示器， 如笔记本电脑显示器、 或桌上型电脑显示器。 对于大尺寸液晶显示器， 考虑到多视角观看， 为避免亮度不均问题， 就必须消除侧突出， 这就不得不使用上扩散片， 以降低辉度增益为代价来 换取亮度的均衡， 提升大尺寸液晶显示器的光学品级， 这是业界一直以来 存在的技术共识。 发明内容
本发明的目的在于提供一种液晶显示装置， 其去除现有光学膜片组最 上层的扩散片， 以光学膜片组的棱镜片直接面对液晶面板， 在保证大尺寸 液晶显示装置光学品级的情况下提高光利用率， 降低生产成本。
为实现上述目的， 本发明提供一种液晶显示装置， 包括： 背光模组及 位于背光模组上的液晶面板， 所述背光模组包括一光学膜片组， 所述光学 膜片组包括一第一棱镜片， 所述液晶面板包括一第一偏光片， 所述第一偏 光片直接面对该第一棱镜片设置， 所述第一棱镜片包括第一基板及设于第 一基板上表面的数条平行排列的第一棱柱， 该些第一棱柱的轴向方向与第 一偏光片的偏振方向之间具有一夹角。
所述第一棱柱的轴向方向与第一偏光片的偏振方向的夹角为 50 ° ~
90。。
所述第一棱镜片第一基板下表面为经过雾化处理的雾化表面。
所述雾化处理方式为蒙砂、 喷砂、 或丝印。
所述第一基板下表面经过雾化处理后的雾度为 10% ~ 40%。
所述光学膜片组还包括一位于第一棱镜片下方的扩散片。
所述光学膜片组还包括一设于第一棱镜片与扩散片之间的第二棱镜 片， 所述第二棱镜片包括第二基板及设于第二基板上表面的数条平行排列 的第二棱柱， 该些第二棱柱的轴向方向与第一棱柱的轴向方向垂直。
所述第一棱柱为三棱柱， 其由第一基板上表面向上逐渐变窄， 进而在 该第一棱柱的顶部形成一尖角； 所述第二棱柱为三棱柱， 其由第二基板上 表面向上逐渐变窄， 该第二棱柱的顶部为一圓角。
所述液晶面板还包括设于第一偏光片上的第一玻璃基板、 设于第一玻 璃基板上的第二玻璃基板、 设于第一与第二玻璃基板之间的液晶及设于第 二玻璃基板上的第二偏光片。
所述背光模组还包括有背板、 设于背板内的反射片、 设于反射片上的 导光板、 设于背板内的背光源及设于背板上的胶框， 所述光学膜片组位于 导光板上， 所述液晶面板设于该胶框上。
本发明的有益效果： 本发明液晶显示装置， 去掉了现有光学膜片组最 上层的扩散片， 降低生产成本， 将处于光学膜片组最上方的第一棱镜片与 液晶面板最下方的第一偏光片呈一定角度设置， 提高了液晶显示装置的透 光率， 改善液晶面板显示的亮暗不均， 在第一棱镜片远离第一偏光片的一 面涂布形成一定的雾度， 消除影像的侧突出光型， 进而提高大尺寸液晶显 示装置的光学品级。
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。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其它有益效果显而易见。
附图中，
图 1为本发明液晶显示装置的结构示意图；
图 2为本发明液晶显示装置中第一棱镜片与第一偏光片的立体分解示 意图；
图 3为光线穿过第一棱镜片与第一偏光片的光路图；
图 4为不同的第一棱镜片第一棱柱的轴向方向与第一偏光片偏振方向 之间的夹角对应的视角亮度的波形图；
图 5 为第一棱镜片第一棱柱的轴向方向与第一偏光片偏振方向夹角为
60°时， 第一棱镜片背面雾度分别为 4%与 30%时的视角亮度波形图；
图 6为本发明液晶显示装置中光学膜片组的一实施例的立体分解图。 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及图 2, 本发明液晶显示装置包括： 背光模组 2及位于背 光模组 2上的液晶面板 4, 所述背光模组 2包括一光学膜片组 20, 所述光 学膜片组 20 包括一第一棱镜片 22, 所述液晶面板 4 包括一第一偏光片 42, 所述第一偏光片 42直接面对该第一棱镜片 22设置， 所述第一棱镜片 22包括第一基板 222及设于第一基板 222上表面的数条平行排列的第一棱 柱 224, 该些第一棱柱 224的轴向方向与第一偏光片 42的偏振方向之间具 有一夹角 θ , 该夹角 Θ为 50° ~ 90°, 优选为 60°。
如图 3所示， 由于光波为横波， 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内的 P分量及垂直于入射 光与法线形成的平面的 S分量， 所述 P分量与第一偏光片 42的偏振方向 一致， 能够穿过第一偏光片 42, 所述 S分量与第一偏光片 42的偏振方向 垂直， 被第一偏光片 42吸收， 不能穿过第一偏光片 42, 光线从第一棱镜 片 22的下表面射入第一棱镜片 22, 在射出第一棱镜片 22的上表面时发生 折射， 由于光线的 P分量和 S分量在不同的入射角， 其反射率及折射率均 不同， 当第一棱镜片 22的第一棱柱 224的轴向方向与该第一偏光片 42的 偏振方向垂直时， 光线经过第一棱镜片 22的上表面折射， 光线 P分量比 S 分量更容易形成折射， 因此产生部分光偏振现象， 而 P分量与第一偏光片 42的偏振方向一致， 能够透过第一偏光片 42, 该第一偏光片 42的穿透率 最高， 即液晶面板的辉度最大。
根据上述原理， 申请人通过实验验证不同架构的光学膜片组对第一偏 光片透光率的影响， 得出结论如下表：
其中： DF 为扩散片， Prism(O)为尖角型棱镜片 （棱镜片的棱柱的顶角 为尖角）及该尖角型棱镜片的棱柱的轴向方向与偏光片偏振方向的夹角， LTC(O)为圓角型棱镜片 （棱镜片的棱柱的顶角为圓角）及该圓角型棱镜的 棱柱的轴向方向与偏光片偏振方向的夹角。
对上述表格具体描述如下：
架构 1、 该光学膜片组由下自上包括： 第一扩散片、 设于第一扩散片 上的尖角型第一棱镜片及设于该尖角型棱镜片上的第二扩散片， 该尖角型 第一棱镜片的第一棱柱的轴向方向垂直于第一偏光片的偏振方向， 将该架 构下的第一偏光片的透光率设定为 100 %以作为比较的基准。
架构 2: 该光学膜片组由下自上包括： 第一扩散片及设于第一扩散片 上的尖角型第一棱镜片， 该第一棱镜片的第一棱柱的轴向方向平行于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 110.9 %。
架构 3: 该光学膜片组由下自上包括： 第一扩散片及设于第一扩散片 上的尖角型第一棱镜片， 该第一棱镜片的第一棱柱的轴向方向垂直于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 115.7 % , 其为架 构 2的透光率的 104.3 %。
架构 4: 该光学膜片组由下自上包括： 第一扩散片及设于第一扩散片 上的圓角型第一棱镜片， 该第一棱镜片的第一棱柱的轴向方向平行于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 102.1 %。
架构 5: 该光学膜片组由下自上包括： 第一扩散片及设于第一扩散片 上的圓角型第一棱镜片， 该第一棱镜片的第一棱柱的轴向方向垂直于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 109.5 % , 其为架 构 4的透光率的 107.3 % ;
架构 6: 该光学膜片组由下自上包括： 第一扩散片、 设于第一扩散片 上的尖角型第一棱镜片、 及设于该尖角型第一棱镜片上的圓角型第二棱镜 片， 其中， 所述尖角型第一棱镜片的第一棱柱的轴向方向垂直于第一偏光 片的偏振方向， 所述圓角型第二棱镜片的第二棱柱的轴向方向平行于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 128.5 % ;
架构 7: 该光学膜片组由下自上包括： 第一扩散片、 设于第一扩散片 上的尖角型第一棱镜片、 及设于该尖角型第一棱镜片上的圓角型第二棱镜 片， 其中， 所述尖角型第一棱镜片的第一棱柱的轴向方向平行于第一偏光 片的偏振方向， 所述圓角型第二棱镜片的第二棱柱的轴向方向垂直于第一 偏光片的偏振方向， 该结构下的第一偏光片的透光率为 136.5 % , 其为架 构 6的透光率的 106.2 % ;
架构 8: 该光学膜片组由下自上包括： 第一扩散片、 设于第一扩散片 上的尖角型第一棱镜片、 及设于该尖角型第一棱镜片上的尖角型第二棱镜 片， 其中， 所述尖角型第一棱镜片的第一棱柱的轴向方向垂直于第一偏光 片的偏振方向， 所述尖角型第二棱镜片的第二棱柱的轴向方向平行于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 145.5 % ;
架构 9: 该光学膜片组由下自上包括： 第一扩散片、 设于第一扩散片 上的尖角型第一棱镜片、 及设于该尖角型第一棱镜片上的尖角型第二棱镜 片， 其中， 所述尖角型第一棱镜片的第一棱柱的轴向方向平行于第一偏光 片的偏振方向， 所述尖角型第二棱镜片的第二棱柱的轴向方向垂直于第一 偏光片的偏振方向， 该架构下的第一偏光片的透光率为 152.2 % , 其为架 构 8的透光率的 104.6 %。 可见， 采用架构 6、 7、 8、 9 时， 第一偏光片的透光率较高， 而对比 架构 6与架构 7及架构 8与架构 9, 可知， 当第一棱镜片的第一棱柱的轴 向方向与第一偏光片偏振方向垂直时， 该第一偏光片的透光率最高。
同时， 针对亮度不均问题， 申请人做了以下实验。 请参阅图 4, 在第 一棱镜片的第一棱柱的轴向方向与第一偏光片的偏振方向垂直的情况下， 旋转第一棱镜片的方向， 其中， A、 B、 C、 D、 E、 F、 G及 H曲线分别表 示在第一棱镜片的第一棱柱旋转 0。、 5。、 10。、 15。、 20。、 25。、 30。及 35。 时的照度波形。
由该曲线图可知， 该第一棱镜片旋转角度小于 40。的情况下， 也就是 第一棱镜片的第一棱柱的轴向方向与第一偏光片的偏振方向的夹角在 50。~90。时， 能同时保证液晶面板的辉度及亮度均勾度， 且在第一棱镜片旋 转角度为 30。时， 也就是第一棱镜片的第一棱柱的轴向方向与第一偏光片 的偏振方向的夹角在 60。， 达到最好效果。
请参阅图 2, 所述第一棱镜片 22第一基板 222下表面为经过雾化处理 的雾化表面， 所述雾化处理方式为蒙砂、 喷砂、 或丝印， 且， 所述第一基 板 222下表面经过雾化处理后的雾度为 10% ~ 40%。
同时请参阅图 5 , 第一棱镜片第一棱柱的轴向方向与第一偏光片的偏 振方向夹角为 60°时， 第一棱镜片背面雾度分别为 4%与 30%时的视角亮度 波形图， 其中， K、 I曲线分别表示雾度为 30%与 4%时的视角亮度波形。 根据实验得知， 当该雾化表面的雾度为 10% ~ 40%之间时， 亮度的均匀度 较佳， 且以雾度为 30%时为最佳。
请参阅图 1、 图 2及图 5 , 为本发明液晶显示装置中光学膜片组的一 实施例的立体分解图， 在本实施例中， 所述光学膜片组 20还包括一位于 第一棱镜片 22下方的扩散片 24、 及一设于第一棱镜片 22与扩散片 24之 间的第二棱镜片 26, 所述第二棱镜片 26 包括第二基板 262及设于第二基 板 262上表面的数条平行排列的第二棱柱 264, 该些第二棱柱 264的轴向 方向与第一棱柱 224 的轴向方向垂直（夹角为 90° ) , 所述第一棱柱 224 为三棱柱， 其由第一基板 222 上表面向上逐渐变窄， 进而在该第一棱柱 224 的顶部形成一尖角； 所述第二棱柱 264 为三棱柱， 其由第二基板 262 上表面向上逐渐变窄， 该第二棱柱 264的顶部为一圓角。
上述光学膜片组 20 的架构仅为一种例子， 其还可以为第一、 第二棱 镜片 22、 26的第一、 第二棱柱 224、 264均为尖角三棱柱、 或均为圓角三 棱柱、 或第一棱镜片 22的第一棱柱 224为圓角三棱柱， 第二 26棱镜片的 第二棱柱 264为尖角三棱柱等， 也可以只设置第一棱镜片 22, 该第一棱镜 片 22的第一棱柱 224也可为圓角、 或尖角三棱柱。
综上所述， 本发明液晶显示装置去掉了现有光学膜片组最上层的扩散 片， 降低生产成本， 将处于光学膜片组最上方的第一棱镜片与液晶面板最 下方的第一偏光片呈一定角度设置， 提高了液晶显示装置的透光率， 改善 液晶面板显示的亮暗不均， 在第一棱镜片远离第一偏光片的一面涂布形成 一定的雾度， 消除影像的侧突出光型， 进而提高大尺寸液晶显示装置的光 学品级。
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 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种液晶显示装置， 包括： 背光模组及位于背光模组上的液晶面 板， 所述背光模组包括一光学膜片组， 所述光学膜片组包括一第一棱镜 片， 所述液晶面板包括一第一偏光片， 所述第一偏光片直接面对该第一棱 镜片设置， 所述第一棱镜片包括第一基板及设于第一基板上表面的数条平 行排列的第一棱柱， 该些第一棱柱的轴向方向与第一偏光片的偏振方向之 间具有一夹角。
2、 如权利要求 1 所述的液晶显示装置， 其中， 所述第一棱柱的轴向 方向与第一偏光片的偏振方向的夹角为 50° ~ 90°。
3、 如权利要求 1 所述的液晶显示装置， 其中， 所述第一棱镜片第一 基板下表面为经过雾化处理的雾化表面。
4、 如权利要求 3 所述的液晶显示装置， 其中， 所述雾化处理方式为 蒙砂、 喷砂、 或丝印。
5、 如权利要求 3 所述的液晶显示装置， 其中， 所述第一基板下表面 经过雾化处理后的雾度为 10% ~ 40%。
6、 如权利要求 1 所述的液晶显示装置， 其中， 所述光学膜片组还包 括一位于第一棱镜片下方的扩散片。
7、 如权利要求 6 所述的液晶显示装置， 其中， 所述光学膜片组还包 括一设于第一棱镜片与扩散片之间的第二棱镜片， 所述第二棱镜片包括第 二基板及设于第二基板上表面的数条平行排列的第二棱柱， 该些第二棱柱 的轴向方向与第一棱柱的轴向方向垂直。
8、 如权利要求 7 所述的液晶显示装置， 其中， 所述第一棱柱为三棱 柱， 其由第一基板上表面向上逐渐变窄， 进而在该第一棱柱的顶部形成一 尖角； 所述第二棱柱为三棱柱， 其由第二基板上表面向上逐渐变窄， 该第 二棱柱的顶部为一圓角。
9、 如权利要求 1 所述的液晶显示装置， 其中， 所述液晶面板还包括 设于第一偏光片上的第一玻璃基板、 设于第一玻璃基板上的第二玻璃基 板、 设于第一与第二玻璃基板之间的液晶及设于第二玻璃基板上的第二偏 光片。
10、 如权利要求 1 所述的液晶显示装置， 其中， 所述背光模组还包括 背板、 设于背板内的反射片、 设于反射片上的导光板、 设于背板内的背光 源及设于背板上的胶框， 所述光学膜片组位于导光板上， 所述液晶面板设 于该胶框上。
11、 一种液晶显示装置， 包括： 背光模组及位于背光模组上的液晶面 板， 所述背光模组包括一光学膜片组， 所述光学膜片组包括一第一棱镜 片， 所述液晶面板包括一第一偏光片， 所述第一偏光片直接面对该第一棱 镜片设置， 所述第一棱镜片包括第一基板及设于第一基板上表面的数条平 行排列的第一棱柱， 该些第一棱柱的轴向方向与第一偏光片的偏振方向之 间具有一夹角；
其中， 所述第一棱柱的轴向方向与第一偏光片的偏振方向的夹角为 50° ~ 90°；
其中， 所述第一棱镜片第一基板下表面为经过雾化处理的雾化表面； 其中， 所述雾化处理方式为蒙砂、 喷砂、 或丝印；
其中， 所述第一基板下表面经过雾化处理后的雾度为 10% ~ 40%； 其中， 所述光学膜片组还包括一位于第一棱镜片下方的扩散片； 其中， 所述光学膜片组还包括一设于第一棱镜片与扩散片之间的第二 棱镜片， 所述第二棱镜片包括第二基板及设于第二基板上表面的数条平行 排列的第二棱柱， 该些第二棱柱的轴向方向与第一棱柱的轴向方向垂直； 其中， 所述第一棱柱为三棱柱， 其由第一基板上表面向上逐渐变窄， 进而在该第一棱柱的顶部形成一尖角； 所述第二棱柱为三棱柱， 其由第二 基板上表面向上逐渐变窄， 该第二棱柱的顶部为一圓角；
其中， 所述液晶面板还包括设于第一偏光片上的第一玻璃基板、 设于 第一玻璃基板上的第二玻璃基板、 设于第一与第二玻璃基板之间的液晶及 设于第二玻璃基板上的第二偏光片；
其中， 所述背光模组还包括背板、 设于背板内的反射片、 设于反射片 上的导光板、 设于背板内的背光源及设于背板上的胶框， 所述光学膜片组 位于导光板上， 所述液晶面板设于该胶框上。
PCT/CN2012/073880 2012-04-01 2012-04-12 液晶显示装置 WO2013149410A1 (zh)

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CN110361883B (zh) * 2018-03-26 2023-04-28 中强光电股份有限公司 防窥控制装置与采用其的背光模块与显示器
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