CN104297993A - 光学补偿膜及制作方法、偏光片、液晶显示面板、显示装置 - Google Patents
光学补偿膜及制作方法、偏光片、液晶显示面板、显示装置 Download PDFInfo
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- G02F1/13363—Birefringent elements, e.g. for optical compensation
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- 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
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- 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
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- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133746—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for high pretilt angles, i.e. higher than 15 degrees
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Abstract
本发明提供了一种光学补偿膜及制作方法、偏光片、液晶显示面板、显示装置,属于显示技术领域。其中,该光学补偿膜包括:第一基板;位于第一基板上的第一取向层;与所述第一基板相对设置的第二基板;位于所述第二基板上、与所述第一取向层相对的第二取向层;位于所述第一取向层和所述第二取向层之间的第一液晶层,所述第一液晶层具有预设的预倾角。本发明的技术方案能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题。
Description
技术领域
本发明涉及显示技术领域,特别是指一种光学补偿膜及制作方法、偏光片、液晶显示面板、显示装置。
背景技术
目前,薄膜晶体管液晶显示器(Thin Film Transistor Liquid Crystal Display,简称TFT-LCD)是显示产品中主要使用的显示装置。高级超维场转换技术(ADvanced Super Dimension Switch,ADS)由于具有高分辨率、高透过率、低功耗、宽视角、高开口率、低色差、无挤压水波纹(push Mura)等优点,被广泛应用于各种显示产品中,其核心技术为:通过同一平面内狭缝电极边缘所产生的电场以及狭缝电极层与板状电极层间产生的电场形成多维电场,使液晶盒内狭缝电极间、电极正上方所有取向液晶分子都能够产生旋转,从而提高了液晶工作效率并增大了透光效率。
光学效能是影响LCD显示效果的主要系数之一,光学效能是根据液晶单元相位延迟以决定其显示效果,其表示为d×△n,其中d为液晶显示面板的上下基板间液晶层的厚度,而△n为液晶的双折射率差。在最初的白光色阶区域,人眼看到的是白色光线,而逐渐转移至中间灰阶色调时,如果红色光的透过率增加,人眼看到的LCD的颜色将不是白色,而会稍向黄色出现偏移,这种现象就称作为偏黄(Yellowish)现象,而这种色偏现象正是造成显示器画质降低的主要原因之一。
在液晶显示面板的制作过程中,由于摩擦取向工艺中无法避免液晶层在取向层表面产生一定预倾角,即液晶层的预倾角无法做到0°,当左视角与右视角相同时,由于预倾角无法做到0°,左视角和右视角所看到液晶轴向不一致进而左视角和右视角的△n不相等,由于视角相同时d相同,因此左视角和右视角的相位延迟△n*d不相等,产生的光程差不相等,透过的光的波长不相等而产生色偏,特别是在暗态下非常明显,从而影响了液晶显示面板的显示效果。
发明内容
本发明要解决的技术问题是提供一种光学补偿膜及制作方法、偏光片、液晶显示面板、显示装置,能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题。
为解决上述技术问题,本发明的实施例提供技术方案如下:
一方面,提供一种光学补偿膜,包括:
第一基板;
位于第一基板上的第一取向层;
与所述第一基板相对设置的第二基板;
位于所述第二基板上、与所述第一取向层相对的第二取向层;
位于所述第一取向层和所述第二取向层之间的第一液晶层,所述第一液晶层具有预设的预倾角。
进一步地,所述第一液晶层采用正单光轴液晶。
进一步地,所述预设的预倾角为2°。
本发明实施例还提供了一种光学补偿膜的制作方法,包括:
在第一基板上形成第一取向层,在第二基板上形成第二取向层;
与所述第一基板相对设置所述第二基板,使所述第一取向层和所述第二取向层相对;
在所述第一取向层和所述第二取向层之间形成第一液晶层,所述第一液晶层具有预设的预倾角。
进一步地,所述第一液晶层采用正单光轴液晶。
进一步地,所述预设的预倾角为2°。
本发明实施例还提供了一种偏光片,包括上述的光学补偿膜。
本发明实施例还提供了一种液晶显示面板,包括从下到上依次叠加的下偏光片、阵列基板、第二液晶层、彩膜基板以及上偏光片,还包括上述的光学补偿膜,所述第一液晶层的预倾角与所述第二液晶层的预倾角之和为180°。
进一步地,所述光学补偿膜位于所述彩膜基板和所述上偏光片之间;
所述光学补偿膜还位于所述阵列基板和所述下偏光片之间。
本发明实施例还提供了一种显示装置,包括上述的液晶显示面板。
本发明的实施例具有以下有益效果:
上述方案中,在液晶显示面板外分别增加一光学补偿膜,该光学补偿膜中液晶层的预倾角与液晶显示面板中液晶层的预倾角之和为180°,即与液晶显示面板中液晶层的预倾角互补,使得液晶显示面板中液晶层最终体现的预倾角为0°,能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题,保证液晶显示面板的显示效果。
附图说明
图1为现有ADS液晶显示面板的结构示意图;
图2为本发明实施例ADS液晶显示面板的结构示意图;
图3为现有ADS液晶显示面板产生色偏现象的示意图;
图4为本发明实施例ADS液晶显示面板解决色偏现象的示意图。
附图标记
1上偏光片 2彩膜基板 3第二液晶层 4阵列基板
5下偏光片 6光学补偿膜
具体实施方式
为使本发明的实施例要解决的技术问题、技术方案和优点更加清楚,下面将结合附图及具体实施例进行详细描述。
本发明的实施例针对现有液晶显示面板中液晶层的预倾角无法做到0°,使得液晶显示面板在暗态下容易有漏光或存在一定的相位延迟,较为容易产生色偏的问题,提供一种光学补偿膜及制作方法、偏光片、液晶显示面板、显示装置,能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题。
本发明实施例提供了一种光学补偿膜,包括:
第一基板;
位于第一基板上的第一取向层;
与所述第一基板相对设置的第二基板;
位于所述第二基板上、与所述第一取向层相对的第二取向层;
位于所述第一取向层和所述第二取向层之间的第一液晶层,所述第一液晶层具有预设的预倾角。
本发明的光学补偿膜可以应用在液晶显示面板中,该光学补偿膜中液晶层的预倾角与液晶显示面板中液晶层的预倾角之和为180°,即与液晶显示面板中液晶层的预倾角互补,使得液晶显示面板中液晶层最终体现的预倾角为0°,能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题,保证液晶显示面板的显示效果。
优选地,所述第一液晶层采用正单光轴液晶。
液晶显示面板中液晶层的预倾角越小越好,0°是最理想值,实际工艺中,液晶层的预倾角往往为2°,因此,本实施例的光学补偿膜中,液晶层的预倾角优选也为2°,该预倾角的方向与液晶显示面板中液晶层预倾角的方向相反。
本发明实施例还提供了一种光学补偿膜的制作方法,包括:
在第一基板上形成第一取向层,在第二基板上形成第二取向层;
与所述第一基板相对设置所述第二基板,使所述第一取向层和所述第二取向层相对;
在所述第一取向层和所述第二取向层之间形成第一液晶层,所述第一液晶层具有预设的预倾角。
本发明制作的光学补偿膜可以应用在液晶显示面板中,该光学补偿膜中液晶层的预倾角与液晶显示面板中液晶层的预倾角之和为180°,即与液晶显示面板中液晶层的预倾角互补,使得液晶显示面板中液晶层最终体现的预倾角为0°,能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题,保证液晶显示面板的显示效果。
进一步地,所述第一液晶层采用正单光轴液晶。
液晶显示面板中液晶层的预倾角越小越好,0°是最理想值,实际工艺中,液晶层的预倾角往往为2°,因此,本实施例制作的光学补偿膜中,液晶层的预倾角优选也为2°,该预倾角的方向与液晶显示面板中液晶层预倾角的方向相反。
本发明实施例还提供了一种偏光片,包括上述的光学补偿膜。
本发明实施例还提供了一种液晶显示面板,包括从下到上依次叠加的下偏光片、阵列基板、第二液晶层、彩膜基板以及上偏光片,其特征在于,还包括上述的光学补偿膜,所述第一液晶层的预倾角与所述第二液晶层的预倾角之和为180°。
本发明在液晶显示面板外分别增加一光学补偿膜,该光学补偿膜中液晶层的预倾角与液晶显示面板中液晶层的预倾角之和为180°,即与液晶显示面板中液晶层的预倾角互补,使得液晶显示面板中液晶层最终体现的预倾角为0°,能够解决液晶显示面板在暗态或特定视角下容易产生色偏的问题,保证液晶显示面板的显示效果。
具体地,所述光学补偿膜位于所述彩膜基板和所述上偏光片之间;
所述光学补偿膜还位于所述阵列基板和所述下偏光片之间。
本发明实施例还提供了一种显示装置,包括如上所述的液晶显示面板。所述显示装置可以为:液晶电视、液晶显示器、数码相框、手机、平板电脑等任何具有显示功能的产品或部件。
下面以ADS产品为例,结合附图以及具体的实施例对本发明的技术方案进行进一步地介绍:
图1为现有ADS液晶显示面板的结构示意图,如图1所示,现有液晶显示面板包括有彩膜基板2、阵列基板4和位于彩膜基板2与阵列基板4之间的液晶层3,在彩膜基板2背向阵列基板4的一侧设置有上偏光片1,在阵列基板4背向彩膜基板2的一侧设置有下偏光片5。
在液晶显示面板的制作过程中,由于摩擦取向工艺中无法避免液晶层3在取向层表面产生一定预倾角,即液晶层3的预倾角无法做到0°,使得ADS产品在暗态下容易漏光或存在一定的相位延迟,较为容易产生色偏,进而影响了ADS产品的应用,比如医疗显示对暗态色度方面有极高的要求,在观看患者检查扫描图片时要求防止色偏以防止误判,因而现有ADS产品容易产生色偏的问题将影响ADS产品在医疗显示方面的应用。
为了改善ADS产品的色偏,本发明提供了一种光学补偿膜,能够解决现有ADS产品在暗态或特定视角下容易产生色偏的问题。现有的光学补偿膜主要是用来提高对比度、改善视角的,而对于ADS产品来说,视角和对比度已经比较好,不用改善也可以达到全视角。本发明的光学补偿膜可以解决现有ADS产品在暗态或特定视角下容易产生色偏的问题,如图2所示为本发明实施例ADS液晶显示面板的结构示意图,在上偏光片1和彩膜基板2之间增加光学补偿膜6,并在下偏光片5和阵列基板4之间增加光学补偿膜6,该光学补偿膜6包括:相对设置的两个基板以及位于两个基板之间的液晶层,该液晶层具有预设的预倾角,如图2所示,该光学补偿膜中液晶层的预倾角能够与ADS液晶显示面板中液晶层的预倾角互补,使得ADS液晶显示面板中液晶层最终体现的预倾角为0°。
光学补偿膜6中的液晶层优选采用正单光轴液晶,由于ADS液晶显示面板内使用的也是正单光轴液晶,光学补偿膜的液晶层与ADS液晶显示面板的液晶层的△n相同,这样视角一样时产生的相位延迟也相同,当光学补偿膜的液晶层的预倾角与ADS液晶显示面板的液晶层的预倾角互补时,产生的相位延迟就能够很好地互补抵消由于相位延迟产生的色偏,如果使用其他液晶时由于△n不相同或有些偏差将达不到补偿暗态下色偏的效果。
图3为现有ADS液晶显示面板产生色偏现象的示意图,假设光的标准波长λ=589nm,液晶层的Δn=ne-no,其中ne为液晶长轴方向上的折射率,no为液晶短轴方向上的折射率,由于液晶层存在一定预倾角,Δn将随着视角变化,d为液晶层的厚度。对于现有的ADS液晶显示面板来说,在Δnd=λ/2时显示正常的白色(正视角),在Δnd<λ/2时,发生蓝色色偏(右视角Δn变小);在Δnd>λ/2时,发生黄色色偏(左视角Δn变大)。
图4为本发明实施例ADS液晶显示面板解决色偏现象的示意图,如图4所示,本发明在ADS液晶显示面板上增加光学补偿膜后,该光学补偿膜中液晶层的预倾角与ADS液晶显示面板中液晶层的预倾角之和为180°,即与ADS液晶显示面板中液晶层的预倾角互补,使得ADS液晶显示面板中液晶层最终体现的预倾角为0°,Δn不再随着视角变化,而是固定不变,保证ADS液晶显示面板在暗态的下表现的色度一样,不再存在色偏现象,从而解决ADS液晶显示面板在暗态或特定视角下容易产生色偏的问题,保证ADS液晶显示面板的显示效果。
实际工艺中,ADS液晶显示面板液晶层的预倾角往往为2°,因此,本实施例制作的光学补偿膜中,液晶层的预倾角也可以设置为2°。
进一步地,还可以对现有的偏光片进行改进,将光学补偿膜6加入到现有偏光片中,这样直接将改进后的偏光片贴附到ADS液晶显示面板的彩膜基板和阵列基板上即可解决ADS液晶显示面板在暗态或特定视角下容易产生色偏的问题。
以上所述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,在不脱离本发明所述原理的前提下,还可以作出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (10)
1.一种光学补偿膜,其特征在于,包括:
第一基板;
位于第一基板上的第一取向层;
与所述第一基板相对设置的第二基板;
位于所述第二基板上、与所述第一取向层相对的第二取向层;
位于所述第一取向层和所述第二取向层之间的第一液晶层,所述第一液晶层具有预设的预倾角。
2.根据权利要求1所述的光学补偿膜,其特征在于,所述第一液晶层采用正单光轴液晶。
3.根据权利要求1所述的光学补偿膜,其特征在于,所述预设的预倾角为2°。
4.一种光学补偿膜的制作方法,其特征在于,包括:
在第一基板上形成第一取向层,在第二基板上形成第二取向层;
与所述第一基板相对设置所述第二基板,使所述第一取向层和所述第二取向层相对;
在所述第一取向层和所述第二取向层之间形成第一液晶层,所述第一液晶层具有预设的预倾角。
5.根据权利要求4所述的光学补偿膜的制作方法,其特征在于,所述第一液晶层采用正单光轴液晶。
6.根据权利要求4所述的光学补偿膜的制作方法,其特征在于,所述预设的预倾角为2°。
7.一种偏光片,其特征在于,包括如权利要求1-3中任一项所述的光学补偿膜。
8.一种液晶显示面板,包括从下到上依次叠加的下偏光片、阵列基板、第二液晶层、彩膜基板以及上偏光片,其特征在于,还包括如权利要求1-3中任一项所述的光学补偿膜,所述第一液晶层的预倾角与所述第二液晶层的预倾角之和为180°。
9.根据权利要求6所述的液晶显示面板,其特征在于,所述光学补偿膜位于所述彩膜基板和所述上偏光片之间;
所述光学补偿膜还位于所述阵列基板和所述下偏光片之间。
10.一种显示装置,其特征在于,包括如权利要求8或9所述的液晶显示面板。
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