WO2013056607A1 - 液晶显示器 - Google Patents

液晶显示器 Download PDF

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Publication number
WO2013056607A1
WO2013056607A1 PCT/CN2012/081362 CN2012081362W WO2013056607A1 WO 2013056607 A1 WO2013056607 A1 WO 2013056607A1 CN 2012081362 W CN2012081362 W CN 2012081362W WO 2013056607 A1 WO2013056607 A1 WO 2013056607A1
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WIPO (PCT)
Prior art keywords
liquid crystal
layer
surface alignment
alignment layer
crystal display
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PCT/CN2012/081362
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English (en)
French (fr)
Inventor
崔贤植
李会
徐智强
田正牧
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US13/698,473 priority Critical patent/US9146421B2/en
Priority to JP2014536097A priority patent/JP6037476B2/ja
Priority to KR1020127030808A priority patent/KR101566066B1/ko
Priority to EP12778027.8A priority patent/EP2605061A4/en
Publication of WO2013056607A1 publication Critical patent/WO2013056607A1/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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal 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
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133565—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements inside the LC elements, i.e. between the cell substrates
    • 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
    • G02F1/133633—Birefringent elements, e.g. for optical compensation using mesogenic materials
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133723—Polyimide, polyamide-imide
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133738—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Definitions

  • Embodiments of the invention relate to a liquid crystal display. Background technique
  • the observed image has a color shift.
  • the alignment film is subjected to a rubbing process during the preparation of the liquid crystal display, it is generally rubbed in a direction opposite to the gate electrode peripheral contact point (Gate-Pad) (for example, from left to right). Therefore, after the liquid crystal is added to the formed liquid crystal cell, the liquid crystal has a pre-tilt angle in the opposite direction (right) of the Gate-Pad. Therefore, as shown in Fig.
  • the viewing effect when viewed from the right side of the liquid crystal screen, the phase difference of the liquid crystal is relatively large, and the viewing effect may be yellowish; when viewed from the left side of the liquid crystal screen, the phase difference of the liquid crystal is relatively small. , the viewing effect will be blue (Bluish).
  • a polarizer and a color shift compensation film are commonly used to improve the color shift phenomenon when the liquid crystal screen is viewed from the left and right sides.
  • the polarizer is added with a c-plate to compensate for the color shift in the up, down, left, and right directions, and the luminance value of the low gray level.
  • this technical solution not only increases the cost but also increases the thickness of the polarizer.
  • the scheme can compensate for the color shift in all directions, the optical design process is very complicated and is not conducive to the problem of large-scale application. Summary of the invention
  • the technical problem to be solved by the embodiments of the present invention relates to how to eliminate the color shift problem of the liquid crystal display in the fringe field switching mode, and to control the production cost and simplify the design.
  • One embodiment of the present invention provides a liquid crystal display comprising: a color filter substrate, an array substrate, and a liquid crystal layer between the color filter substrate and the array substrate.
  • An upper surface alignment layer is disposed between the color filter substrate and the liquid crystal layer, and a lower surface alignment layer is disposed between the array substrate and the liquid crystal layer.
  • the upper surface alignment layer sequentially includes a first upper surface alignment layer, a color shift compensation film layer, and a second upper surface alignment layer in a direction from the color filter substrate to the liquid crystal layer.
  • Color shift compensation The orientation direction of the film layer is opposite to the pre-orientation direction of the liquid crystal layer.
  • the color shift; the material of the film layer is selected as a reactive monomer material.
  • the rubbing direction of the first upper surface alignment layer is set to be the same as the rubbing direction of the lower surface alignment layer.
  • the rubbing direction of the color shift compensation film layer is set to be the same as the rubbing direction of the lower surface alignment layer.
  • the rubbing direction of the second upper surface alignment layer is set to be opposite to the rubbing direction of the lower surface alignment layer.
  • FIG. 1 is a schematic diagram of a color shift problem of a liquid crystal display in the prior art, wherein a phase difference when the liquid crystal is viewed from the right side is greater than a phase difference when the liquid crystal is viewed from the left side;
  • FIGS. 2A-2B are schematic structural views of a liquid crystal display provided by a specific embodiment. detailed description
  • the phase difference is reduced by using the color shift compensation film in the embodiment of the present invention.
  • the reactive monomer material (Reactive Mezogen, RM) was selected for the material of the color shift compensation film.
  • This RM material is also known as reactive liquid crystal.
  • the reactive liquid crystal has a liquid crystal core with one or more reactive groups (Reactive Groups), usually an Acrylate Group, which can be photopolymerized into a polymer network. Since most of the polymerization initiators used are UV-sensitive (wavelengths of 254 to 365 nm), reactive liquid crystals are also referred to as UV-reactive liquid crystals.
  • suppliers and products of UV-reactive liquid crystals include Merck's RM series, Wacker's SLM series, and BASF's Paliocolor series.
  • RM materials see, for example, Reactive Mesogen Mixtures for Integrated Optical Films, Lee et al, 2003 IMID.
  • the RM material has a phase difference as in the case of a normal liquid crystal, and it hardens after being irradiated with ultraviolet rays, and becomes an optical layer having a certain phase difference after hardening. Therefore, after the color shift compensation film of the RM material is added in a certain manner in the liquid crystal display, the phase difference of the liquid crystal can be reduced, thereby improving the color generated when the screen of the liquid crystal display in the fringe field switching mode is viewed from the left and right sides. Partial problem.
  • liquid crystal display in the fringe field switching mode provided by the embodiment of the present invention
  • the liquid crystal display 100 is, for example, a fringe field switch (FFS) type liquid crystal display. As shown in FIG. 2A, the liquid crystal display 100 includes: a color filter substrate 10, an array substrate 20, and a liquid crystal layer 30 between the color filter substrate and the array substrate. An upper surface alignment layer 40 is disposed between the color filter substrate 10 and the liquid crystal layer 30, and a lower surface alignment layer 50 is disposed between the array substrate 20 and the liquid crystal layer 30.
  • FFS fringe field switch
  • the liquid crystal display 100 is, for example, an advanced multi-dimensional electric field (ADS) type liquid crystal display, and further includes: a color filter substrate 10, an array substrate 20, and a liquid crystal layer 30 between the color filter substrate and the array substrate.
  • An upper surface alignment layer 40 is disposed between the color filter substrate 10 and the liquid crystal layer 30, and a lower surface alignment layer 50 is disposed between the array substrate 20 and the liquid crystal layer 30.
  • the upper and lower surface alignment layers are, for example, polyimide (PI) layers, and a fine groove of a certain orientation is formed on the surface thereof by a rubbing process for pre-orienting the liquid crystal.
  • 2B shows an enlarged schematic view of the upper surface alignment layer 40, the liquid crystal layer 30, and the lower surface alignment layer 50.
  • the upper surface alignment layer 40 sequentially includes, in the direction of the color filter substrate 10 to the liquid crystal layer 30, a first upper surface alignment layer 41, a color shift compensation film layer 42, and a second upper surface alignment layer 43.
  • the color shift compensation film layer 42 is prepared from a hardened RM material.
  • the RM material has the usual liquid crystal properties and has a certain phase difference after hardening.
  • the rubbing direction of the first upper surface alignment layer 41 is set to be the same as the rubbing direction of the lower surface alignment layer 50.
  • the rubbing direction of the first upper surface alignment layer 41 is used to orient the RM material.
  • the rubbing direction of the color shift compensation film layer 42 is set to be the same as the rubbing direction of the lower surface alignment layer 50.
  • the rubbing direction of the second upper surface alignment layer 42 is set to be opposite to the rubbing direction of the lower surface alignment layer 50.
  • the liquid crystal display having the above structure has a phase difference generated for the right side which is slightly equal to the phase difference generated for the left side, that is, the phase difference generated for the left and right sides in the liquid crystal display of the prior art is eliminated, thereby resulting in generation.
  • An example of the forming process of the first upper surface alignment layer is as follows. First, in the color film A first upper surface alignment layer 41 is formed on the inner surface of the substrate 10, and the first upper surface alignment layer 41 on the color filter substrate 10 is subjected to alignment treatment along the same rubbing direction as the lower surface alignment layer 50 on the array substrate 20. Rubbing in the same direction. At this time, as shown in FIG. 2B, the rubbing direction of the lower surface alignment layer 50 is leftward, and the rubbing direction of the horizontal first upper surface alignment layer 41 is also leftward.
  • a color shift compensation film layer 42 is formed on the first upper surface alignment layer 41, that is, the RM material is coated, and then the color shift compensation film layer 42 is oriented in accordance with the orientation characteristics of the first upper surface alignment layer 41, that is, RM.
  • the rubbing direction of the color shift compensation film layer 42 is also the same as the rubbing direction of the lower surface alignment layer 50 on the array substrate 20, and then the RM color shift compensation film layer is cured by UV irradiation.
  • a second upper surface alignment layer 43 is formed on the color shift compensation film layer 42, and the second upper surface alignment layer 43 is subjected to an alignment treatment to rub in a direction opposite to the rubbing direction of the lower surface alignment layer 50 on the array substrate, that is, The rubbing process is performed to the right to form an anti-parallel rubbing structure in the initial stage of formation of the liquid crystal display in the fringe field switching mode.
  • the arrangement direction of the RM material is opposite to the pre-arrangement direction of the liquid crystal.
  • the arrangement direction of the RM material is opposite to the pre-arrangement direction of the liquid crystals and is symmetrical to each other.
  • the color shift compensation film layer 42 of the RM material is rubbed in the opposite direction to the lower surface alignment layer 50 on the array substrate 20, a larger phase difference is generated in the liquid crystal display as a whole, and thus the rubbing direction thereof It must be the same as the rubbing direction of the lower surface alignment layer 50 on the array substrate 20.
  • the orientation direction of the color shift compensation film layer 42 of the RM material is opposite to that of the liquid crystal, so there is an effect of compensating the phases with each other; if the orientation direction of the color shift compensation film layer 42 of the RM material is opposite to the liquid crystal and is symmetrical with each other, the phase The compensation effect is better.
  • the phase difference generated by the liquid crystal display becomes small, and the viewing effect is yellowish or pale blue.
  • the first upper surface alignment layer 41 may also be formed of a UV polarizer, and the rubbing process for the first upper surface alignment layer 41 will also be eliminated.
  • the embodiment of the present invention has the following characteristics:
  • the effect of compensating the phase between the color shift compensation film layer and the liquid crystal layer can be achieved.
  • the phase difference generated by the screen of the liquid crystal display on the left and right sides will become smaller, and the viewing effect may be improved to be yellowish or light blue, thereby effectively solving the fringe field switching mode viewed from the left and right sides.
  • the color shift problem that occurs when the LCD screen is used.
  • the method of adding a color shift compensation film to a polarizer has a problem that the thickness of the polarizer is increased; however, the thickness thereof is not changed in the embodiment of the present invention; therefore, the fringe field switching can be applied to a television, a display, or the like.
  • the design of the ultra-thin model of the model provides a powerful help.

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

Abstract

一种液晶显示器（100），包括：彩膜基板（10）、阵列基板（20）以及位于彩膜基板和阵列基板之间的液晶层（30），其中，在彩膜基板与液晶层之间设置上表面取向层（40），在阵列基板与液晶层之间设置下表面取向层（50）；其中，上表面取向层设置为沿彩膜基板至液晶层的方向依次包括：第一上表面取向层（41）、色偏补偿薄膜层（42）以及第二上表面取向层（43），色偏补偿薄膜层的取向方向与液晶层的预取向方向相反。通过使用色偏补偿薄膜层来改善从左右两侧观看边缘场切换模式下的液晶屏幕时产生的色偏问题。

Description

液晶显示器 技术领域
本发明的实施例涉及一种液晶显示器。 背景技术
对于边缘场切换（Fringe Field Switching, FFS )模式的液晶显示器， 当 分别从左右两侧观看液晶显示器的屏幕时， 所观看到的图像存在色偏移。 这 是因为在制备液晶显示器过程中对取向膜进行摩擦（ Rubbing )工艺进行取向 时， 一般会沿着与栅电极外围电路接触点 （Gate-Pad )相反的方向进行摩擦 (比如， 从左到右） ， 从而在形成的液晶盒中加入液晶后， 液晶在 Gate-Pad 的反方向 （右）上存在预倾角 （ Pre-tilt angle ) 。 因此， 如图 1所示， 从液晶 屏幕右侧观看时， 液晶相位差相对较大， 观看效果会存在偏黄（ Yellowish ) 的情况； 而从液晶屏幕左侧观看时， 液晶相位差相对较小， 观看效果会存在 偏蓝（Bluish ) 的情况。
目前， 常用偏光片加色偏补偿薄膜的方式来改善从左右两侧观看液晶屏 幕时的色偏现象。 具体为， 偏光片加 c-plate来补偿上下左右及对角线方向的 色偏以及低灰阶的亮度值。 但是， 该技术方案不仅会增加成本， 而且还会增 加偏光片的厚度。 同时， 虽然该方案可以全方位对色偏进行补偿， 但存在光 学设计过程非常复杂， 不利于规模化应用的问题。 发明内容
本发明的实施例要解决的技术问题涉及如何消除边缘场切换模式下液晶 显示的色偏问题， 并控制生产成本， 简化设计。
本发明的一个实施例提供了一种液晶显示器， 所述液晶显示器包括： 彩 膜基板、 阵列基板以及位于彩膜基板与阵列基板之间的液晶层。 在所述彩膜 基板与液晶层之间设置有上表面取向层， 在所述阵列基板与液晶层之间设置 有下表面取向层。 所述上表面取向层沿彩膜基板至液晶层的方向依次包括： 第一上表面取向层、 色偏补偿薄膜层以及第二上表面取向层。 所述色偏补偿 薄膜层的取向方向与所述液晶层的预取向方向相反。
例如， 所述色偏;^卜偿薄膜层的材料选择为反应单体材料。
例如， 所述第一上表面取向层的摩擦方向设置为与所述下表面取向层的 摩擦方向相同。
例如， 所述色偏补偿薄膜层的摩擦方向设置为与所述下表面取向层的摩 擦方向相同。
例如， 所述第二上表面取向层的摩擦方向设置为与所述下表面取向层的 摩擦方向相反。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为现有技术中液晶显示器存在色偏问题的示意图， 其中从右侧观看 液晶时的相位差大于从左侧观看液晶时的相位差；
图 2A-2B为具体实施方式所提供的液晶显示器结构示意图。 具体实施方式
下面结合附图和实施例， 对本发明作进一步详细描述。
为消除在边缘场切换模式的液晶显示器左右两侧观看时存着色偏的问 题， 并控制生产成本， 简化设计， 本发明的实施例中通过使用色偏补偿薄膜 的方法来减小相位差。
对于色偏补偿薄膜的材料选择反应单体材料 ( Reactive Mezogen, RM )。 该 RM材料又称为反应型液晶。 反应型液晶具有液晶核（ Core ), 末端带有一 个或多个可反应官能团 （Reactive Groups ), 通常为压克力基团 （ Acrylate Group ), 可经光聚合成高分子网络。 由于所使用的聚合起始剂多为 UV感光 型 （波长为 254 ~ 365nm ), 故也反应型液晶也被称为 UV反应型液晶。 目前 UV反应型液晶的供应商与产品有 Merck的 RM 系列、 Wacker的 SLM系列、 BASF 的 Paliocolor 系列等。 关于 RM 材料的示例例如又请见 Reactive Mesogen Mixtures for Integrated Optical Films, Lee et al, 2003 IMID. RM材料与通常的液晶一样是存在相位差，其在被紫外线照射后硬化，硬 化后会变成有着一定相位差的光学层。 因此， 在液晶显示器中按照一定方式 加装 RM材料的色偏补偿薄膜后， 液晶的相位差能够被减小， 进而改善从左 右两侧观看边缘场切换模式下的液晶显示器的屏幕时产生的色偏问题。
详细而言， 本发明的实施例所提供的边缘场切换模式下的液晶显示器
100, 该液晶显示器 100例如边缘场开关（FFS )型液晶显示器。 如图 2A所示， 该液晶显示器 100包括： 彩膜基板 10、 阵列基板 20以及位于彩膜基板与阵列基 板之间的液晶层 30。 在所述彩膜基板 10与液晶层 30之间设置有上表面取向层 40, 在所述阵列基板 20与液晶层 30之间设置有下表面取向层 50。
在另一个实施例之中， 液晶显示器 100例如是高级多维电场 (ADS)型液晶 显示器， 也包括： 彩膜基板 10、 阵列基板 20以及位于彩膜基板与阵列基板之 间的液晶层 30。 在所述彩膜基板 10与液晶层 30之间设置有上表面取向层 40, 在所述阵列基板 20与液晶层 30之间设置有下表面取向层 50。
上下表面取向层例如为聚酰亚胺（PI )层， 并通过摩擦工艺在其表面上 形成一定取向的细微的凹槽， 用于对液晶进行预取向。 图 2B示出了上表面取 向层 40、 液晶层 30以及下表面取向层 50的放大示意图。
所述上表面取向层 40沿彩膜基板 10至液晶层 30的方向依次包括： 第一上 表面取向层 41、 色偏补偿薄膜层 42以及第二上表面取向层 43。
所述色偏补偿薄膜层 42由经过硬化的 RM材料制备。该 RM材料具备通 常的液晶的性质， 在硬化后存在一定的相位差。
所述第一上表面取向层 41的摩擦方向设置为与所述下表面取向层 50的 摩擦方向相同。 第一上表面取向层 41的摩擦方向用于对 RM材料进行定向。
所述色偏补偿薄膜层 42的摩擦方向设置为与所述下表面取向层 50的摩 擦方向相同。
所述第二上表面取向层 42的摩擦方向设置为与所述下表面取向层 50的摩 擦方向相反。
这样， 应用上述结构的液晶显示器， 对于右侧产生的相位差略等于对于 左侧产生的相位差， 亦即消除了现有技术中液晶显示器中对于左右两侧产生 的相位差不同， 从而导致产生色偏的问题。
所述第一上表面取向层的成形工艺过程的一个示例如下。 首先， 在彩膜 基板 10的内表面上形成第一上表面取向层 41 , 对该彩膜基板 10上的第一上表 面取向层 41进行取向处理， 沿与阵列基板 20上的下表面取向层 50相同的摩擦 方向相同的方向来进行摩擦。 此时， 如图 2B所示， 叚设下表面取向层 50的摩 擦方向向左， 则水平第一上表面取向层 41的摩擦方向也同样向左。 然后， 在 第一上表面取向层 41上形成色偏补偿薄膜层 42, 即涂覆 RM材料， 然后将色偏 补偿薄膜层 42按第一上表面取向层 41的取向特性进行取向处理， 即 RM色偏补 偿薄膜层 42的摩擦方向也与阵列基板 20上的下表面取向层 50的摩擦方向相 同， 之后将 RM色偏补偿薄膜层通过 UV照射被硬化后。 在色偏补偿薄膜层 42 上形成第二上表面取向层 43 , 对第二上表面取向层 43进行取向处理， 沿与阵 列基板上的下表面取向层 50摩擦方向相反的方向来进行摩擦， 即向右进行摩 擦工艺， 从而在边缘场切换模式的液晶显示器的形成初期取向逆平行摩擦 ( anti-parallel rubbing )结构。 在该结构中， RM材料的排列方向与液晶的预排 列方向相反。 在另一个实施例之中， RM材料的排列方向与液晶的预排列方向 相反且相互对称。
此处，如果 RM材料的色偏补偿薄膜层 42按照与阵列基板 20上的下表面取 向层 50相反的方向进行摩擦时， 则会导致液晶显示器整体上产生更大的相位 差， 因此其摩擦方向必须与阵列基板 20上的下表面取向层 50的摩擦方向相同。
此时， RM材料的色偏补偿薄膜层 42的取向方向与液晶相反， 所以会存在 相互补偿相位的效果； 如果 RM材料的色偏补偿薄膜层 42的取向方向与液晶相 反且相互对称， 则相位补偿效果更好。 这样的话， 从左右两侧观看时液晶显 示器的屏幕时， 液晶显示器所产生的相位差会变小， 随之可以改善观看效果 偏淡黄或偏淡蓝的情况。
在另一个示例中， 第一上表面取向层 41也可以是由 UV偏光材料 (UV polarizer)形成， 那么也将不再需要用于第一上表面取向层 41的摩擦工艺。
综上， 本发明的实施例与现有技术相比， 存在如下几点特征：
( 1 )通过将由 RM材料制备的色偏补偿薄膜层的取向方向设置与液晶的 预排列方向相反或进一步相互对称， 从而能够实现色偏补偿薄膜层与液晶层 相互补偿相位的效果。 这样的话， 液晶显示器的屏幕在左右两侧所产生的相 位差会变小， 随之可以改善观看效果偏淡黄或偏淡蓝的情况， 进而有效解决 从左右两侧观看边缘场切换模式下的液晶屏幕时所产生的色偏问题。 ( 2 )由于该技术方案成本增加因素较少， 光学设计简单， 可以轻松应用 于实际中。 现有技术中在偏光片上增加色偏补偿薄膜的方式， 存在偏光片厚 度增加的问题； 但是， 在本发明的实施例中其厚度没有变化； 因此， 可对电 视机、 显示器等应用边缘场切换模式的超薄型产品的设计提供有力的帮助。
以上所述仅是本发明的优选实施方式， 应当指出， 对于本技术领域的普 通技术人员来说， 在不脱离本发明技术原理的前提下， 还可以做出若干改进 和变形， 这些改进和变形也应视为本发明的保护范围。

Claims

权利要求书
1、 一种液晶显示器， 包括： 彩膜基板、 阵列基板以及位于彩膜基板与阵 列基板之间的液晶层，
其中， 在所述彩膜基板与液晶层之间设置有上表面取向层， 在所述阵列 基板与液晶层之间设置有下表面取向层，
其中， 所述上表面取向层沿彩膜基板至液晶层的方向依次包括第一上表 面取向层、 色偏补偿薄膜层以及第二上表面取向层， 所述色偏补偿薄膜层的 取向方向与所述液晶层的预取向方向相反。
2、如权利要求 1所述的液晶显示器， 其中， 所述色偏补偿薄膜层的材料 选择为反应单体材料。
3、如权利要求 1或 2所述的液晶显示器， 其中， 所述第一上表面取向层 的摩擦方向设置为与所述下表面取向层的摩擦方向相同。
4、 如权利要求 1-3任一所述的液晶显示器， 其中， 所述色偏补偿薄膜层 的摩擦方向设置为与所述下表面取向层的摩擦方向相同。
5、 如权利要求 1-4任一所述的液晶显示器， 其中， 所述第二上表面取向 层的摩擦方向设置为与所述下表面取向层的摩擦方向相反。
6、 如权利要求 1-5任一所述的液晶显示器， 其中， 所述第一上表面取向 层由聚酰亚胺或 UV偏光材料形成。
PCT/CN2012/081362 2011-10-20 2012-09-13 液晶显示器 WO2013056607A1 (zh)

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