CN104460130B - 透反式液晶面板以及液晶显示器 - Google Patents

透反式液晶面板以及液晶显示器 Download PDF

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CN104460130B
CN104460130B CN201410757117.4A CN201410757117A CN104460130B CN 104460130 B CN104460130 B CN 104460130B CN 201410757117 A CN201410757117 A CN 201410757117A CN 104460130 B CN104460130 B CN 104460130B
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liquid crystal
crystal panel
layer
area
array base
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CN104460130A (zh
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谢畅
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to PCT/CN2015/070120 priority patent/WO2016090715A1/zh
Priority to US14/422,357 priority patent/US9645440B2/en
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Abstract

本发明公开了一种透反式液晶面板，包括相对设置的阵列基板和彩膜基板以及位于所述阵列基板和彩膜基板之间的液晶层，所述阵列基板包括多个像素区域，每个所述像素区域包括透射区和反射区，所述阵列基板还包括位于所述像素区域内的多个像素电极，各个像素电极呈弯折的条状并且彼此间隔设置；其中，位于所述透射区中的像素电极的弯折夹角为α1，位于所述反射区中的像素电极的弯折夹角为α2，并且，α1＜α2，以使所述透射区的相位延迟量与反射区的相位延迟量相匹配。本发明还公开了包含前述透反式液晶面板的液晶显示器。

Description

透反式液晶面板以及液晶显示器
技术领域
本发明属于液晶显示技术领域，涉及一种透反式液晶面板以及包含该液晶面板的液晶显示器。
背景技术
目前，液晶显示器(Liquid Crystal Display：简称LCD)以其优异的性能与成熟的技术成为市场上的主流产品。液晶面板是液晶显示器中的关键部件，液晶面板主要由彩膜基板和阵列基板对盒而成，所述彩膜基板和阵列基板之间填充液晶而构成液晶盒。液晶面板根据光源类型可以分为透射式(transmissive)、反射式(reflective)和透反式(transflective，也称为半透射半反射式)。
其中，透射式的液晶面板主要以背光源作为光源，在液晶面板后面设置有背光源，阵列基板上的像素电极为透明电极作为透射区，有利于背光源的光线透射穿过液晶层来显示图像；反射式液晶面板主要是以前光源或者外界光源作为光源，其阵列基板采用金属或者其他具有良好反射特性材料的反射电极作为反射区，适于将前光源或者外界光源的光线反射；透反式液晶显示面板则可视为透射式与反射式液晶显示面板的结合，在阵列基板上既设置有反射区，又设置有透射区，可以同时利用背光源以及前光源或者外界光源以进行显示。
透射式液晶面板的优点是可以在暗的环境下显示明亮的图像，但缺点是能透过的光线占背光源发射光线的比例较小，背光源利用率不高，为提高显示亮度就需要大幅度提高背光源的亮度，因此能耗高。反射式液晶面板的优点是能利用外部光源，功耗相对较低，但缺点是由于对外部光源的依赖而无法在暗处显示图像。透反式液晶面板兼具透射式和反射式液晶显示面板的优点，既可以在暗的环境下显示明亮的图像，室内使用，也可以在室外使用。因此，它被广泛用于便携式移动电子产品的显示设备，如手机，数码相机，掌上电脑，GPRS等移动产品。
但是，透反式液晶面板的不足之处在于，透射区射出的光线只经过一次液晶层，而反射区射出的光线则经过两次液晶层，这样，就造成透反式液晶显示器中不同的光源发出的光线在反射区与透射区光路(光程)不同，使得透射区与反射区的色差较大，导致透反式液晶显示器中显示的影像出现色彩不协调的情况。为了改善色彩不协调的现象，目前，透反式液晶面板通常采用双盒厚间距设计方式，即使得对应反射区的液晶盒的盒厚为对应透射区的液晶盒的盒厚的一半，以保证反射区的液晶的相位延迟量与透射区的液晶的相位延迟量相等(即，使得通过两个区域的光线的相位延迟量能够匹配)，从而保证透射区和反射区的色差较小以及色彩协调。但是这种结构的透反式液晶面板由于液晶盒存在盒厚差异，导致液晶面板的制作工艺复杂，盒厚均匀性不易控制。
发明内容
有鉴于此，本发明所要解决的技术问题是针对现有技术中透反式液晶面板存在的不足，提供一种透反式液晶面板以及包含该液晶面板的液晶显示器，该液晶面板在保证透射区和反射区的液晶盒盒厚相等的情况下，简化液晶面板的制作工艺；且能够使透射区和反射区的色差较小以及色彩协调，提高液晶显示器的显示品质。
为了实现上述目的，本发明采用了如下的技术方案：
一种透反式液晶面板，包括相对设置的阵列基板和彩膜基板以及位于所述阵列基板和彩膜基板之间的液晶层，所述阵列基板包括多个像素区域，每个所述像素区域包括透射区和反射区，其中，所述阵列基板还包括位于所述像素区域内的多个像素电极，各个像素电极呈弯折的条状并且彼此间隔设置；其中，位于所述透射区中的像素电极的弯折夹角为α1，位于所述反射区中的像素电极的弯折夹角为α2，并且，α1＜α2，以使所述透射区的相位延迟量与反射区的相位延迟量相匹配。
进一步地，所述阵列基板上还设置有反射层，所述反射层覆盖区域为反射区，所述反射层未覆盖区域为透射区。
进一步地，所述阵列基板上还设置有公共电极层，所述公共电极层覆盖所述反射层，所述公共电极层上设置有一绝缘层，所述多个像素电极位于所述绝缘层上，所述公共电极层与所述多个像素电极通过所述绝缘层电性绝缘。
进一步地，所述透射区的光程差为所述反射区的光程差的两倍。
进一步地，所述液晶面板还包括第一偏振片和第二偏振片，所述第一偏振片设于所述彩膜基板远离液晶层的一侧，所述第二偏振片设于所述阵列基板远离液晶层的一侧，所述第一偏振片的透光轴与第二偏振片的透光轴平行。
进一步地，所述液晶层的液晶分子的初始取向与所述偏振片的透光轴平行。
进一步地，所述液晶层的液晶为正性液晶。
进一步地，所述液晶面板中，透射区对应的部分和反射区对应的部分的厚度相等。
本发明的另一方面是提供一种液晶显示器，包括液晶面板及背光模组，所述液晶面板与所述背光模组相对设置，所述背光模组提供显示光源给所述液晶面板，其中，所述液晶面板采用如上所述的透反式液晶面板。
本发明实施例提供的透反式液晶面板，通过在透射区和反射区设置具有不同弯折夹角弯折条状像素电极，其中位于透射区中的像素电极的弯折夹角小于位于反射区中的像素电极的弯折夹角，能保证透射区和反射区的液晶的相位延迟量的匹配，因此无需改变液晶面板中液晶盒的盒厚，在液晶层厚度保持一致的情况下，可以大大简化液晶面板的制作工艺，同时也改善了液晶显示器的显示品质。
附图说明
图1是本发明实施例提供的透反式液晶面板的结构示意图
图2是本发明实施例中一个像素区域中的像素电极的结构示意图。
图3为本发明实施例中液晶层在不加电压时的俯视示意图。
图4为本发明实施例中液晶层在施加电压时的俯视示意图。
图5是本发明实施例提供的液晶显示器的结构示意图。
具体实施方式
为使本领域技术人员更好地理解本发明的技术方案，下面结合附图和具体实施方式对本发明的透反式液晶面板以及液晶显示器作进一步详细描述。
参阅图2和图3，本实施例提供的透反式液晶面板，包括相对设置的阵列基板10和彩膜基板20以及位于所述阵列基板10和彩膜基板20之间的液晶层30，所述阵列基板10包括多个像素区域40，每个所述像素区域40包括透射区41和反射区42。其中，所述阵列基板10还包括位于所述像素区域40内的多个像素电极50，各个像素电极50呈弯折的条状并且彼此间隔设置。进一步地，位于所述透射区41中的像素电极50的弯折夹角为α1，位于所述反射区42中的像素电极50的弯折夹角为α2，并且，α1＜α2，以使所述透射区41的相位延迟量与反射区42的相位延迟量相匹配。
具体地，如图1所示，所述阵列基板10上还设置有反射层60，所述反射层60覆盖区域为反射区42，所述反射层60未覆盖区域为透射区42。进一步地，所述阵列基板10上还设置有公共电极层70，所述公共电极层70覆盖所述反射层60，所述公共电极层70上设置有一绝缘层80，所述多个像素电极50位于所述绝缘层80上，所述公共电极层70与所述多个像素电极50通过所述绝缘层80电性绝缘。进一步地，所述液晶面板还包括第一偏振片91和第二偏振片92，所述第一偏振片91设于所述彩膜基板20远离液晶层30的一侧，所述第二偏振片92设于所述阵列基板10远离液晶层30的一侧，所述第一偏振片91的透光轴与第二偏振片92的透光轴平行(如图2中的X方向)。
本实施例中，所述液晶层30中的液晶采用正性液晶。图3为本实施例中液晶层在不加电压时的俯视示意图。如图3所示，本实施例中，所述液晶层30中的液晶分子的初始取向与所述偏振片91、92的透光轴平行。
为了保证液晶面板中透射区与反射区之间的相位延迟差相匹配，需要在透射区和反射区设置具有不同弯折夹角弯折条状像素电极。如图2所示的，位于所述透射区41中的像素电极50的弯折夹角为α1，位于所述反射区42中的像素电极50的弯折夹角为α2，其中，α1＜α2。或者说，位于透射区中的像素电极的倾斜角度大于位于反射区中的像素电极的倾斜角度。在此，像素电极的倾斜角度是指像素电极与垂直于偏振片91、92的透光轴的方向(如图2中的Y方向)的夹角。如图2所示的，位于所述透射区41中的像素电极50的倾斜角度为β1，位于所述反射区42中的像素电极50的倾斜角度为β2，其中，β1＞β2。
图4为本实施例中液晶层在施加电压时的俯视示意图。在向像素电极50施加电压时，在透射区41，由于像素电极50的倾斜角度较大，能够产生倾斜角度较大的电场，液晶分子在电场的作用下会产生较大程度的偏转角度β1，经过透射区41的光线会产生较大的水平相位延迟量。在反射区42，由于像素电极50的倾斜角度较小，能够产生倾斜角度较小的电场，液晶分子在电场的作用下会产生较小程度的偏转角度β2，经过反射区42的光线会产生较小的水平相位延迟量。因此，我们通过对像素电极50的倾斜角度的优化，使得经过透射区41的光线会产生比反射区42更多的的光程差，大概为透射区41的光程差为反射区42的光程差的两倍，而反射区42的光线因为反射的缘故相当于两次经过液晶层30，所以就可以实现透射区和反射区的相位延迟量的匹配，并最终达到半透半反的显示效果。
在实际的制备工艺中，对于透射区41和反射区42的像素电极50的倾斜角度的优化，可以采用实验测试的方法来找到优化角度。两者的倾斜角度关系的确定与液晶的性质(如：双折射率性质，介电各向异性性质，介电常数等)相关。具体可以按照以下测试方法针对包含特定一种液晶面板，确定两者的倾斜角度关系：
首先，按照预先设定的几个倾斜角度比值制造不同的测试面板，并且，这些测试面板中均填充上述特定的一种液晶。其次，绘制这几个测试面板的透射区和反射区的V-T(电压-透过率)曲线特性，若一测试面板的透射区和反射区的曲线特性在误差范围内一致，则说明透射区的相位延迟大致为反射区的相位延迟的2倍，那么该测试面板的透射区和反射区的像素电极的倾斜角度可以作为实际生产中的参考值。在本发明实施例中对上述比值不加限定，而以实际生产中能够使得同一个像素区域的透射区、反射区的光线通过所述液晶层所产生的相位延迟量相同为准。
本实施例中，所述液晶层30中对应所述反射区42的部分的厚度和对应透射区41的部分的厚度相等，即该液晶面板为单盒厚透反式液晶面板。由于所述液晶面板中的液晶盒的盒厚均匀，在液晶层厚度保持一致的情况下，可以大大简化液晶面板的制作工艺，同时也改善了透反式液晶显示器的显示品质。
本实施例还提供了一种液晶显示器，如图5所示，本实施例提供的液晶显示器包括相对设置的液晶面板200以及背光模组100，由所述背光模组100提供显示光源给所述液晶面板200，其中，液晶面板200采用了如上所述的透反式液晶面板。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (2)

1.一种透反式液晶面板，包括相对设置的阵列基板和彩膜基板以及位于所述阵列基板和彩膜基板之间的液晶层，所述阵列基板包括多个像素区域，每个所述像素区域包括透射区和反射区，其特征在于，所述阵列基板还包括位于所述像素区域内的多个像素电极，各个像素电极呈弯折的条状并且彼此间隔设置；其中，位于所述透射区中的像素电极的弯折夹角为α1，位于所述反射区中的像素电极的弯折夹角为α2，并且，α1＜α2，以使所述透射区的光程差为所述反射区的光程差的两倍时，所述液晶面板中的透射区对应的部分和反射区对应的部分的厚度相等；
其中，所述阵列基板上还设置有反射层，所述反射层覆盖区域为反射区，所述反射层未覆盖区域为透射区；
其中，所述阵列基板上还设置有公共电极层，所述公共电极层覆盖所述反射层，所述公共电极层上设置有一绝缘层，所述多个像素电极位于所述绝缘层上，所述公共电极层与所述多个像素电极通过所述绝缘层电性绝缘；
其中，所述液晶面板还包括第一偏振片和第二偏振片，所述第一偏振片设于所述彩膜基板远离液晶层的一侧，所述第二偏振片设于所述阵列基板远离液晶层的一侧，所述第一偏振片的透光轴与第二偏振片的透光轴平行，所述液晶层的液晶分子的初始取向与所述偏振片的透光轴平行，所述液晶层的液晶为正性液晶。
2.一种液晶显示器，包括液晶面板及背光模组，所述液晶面板与所述背光模组相对设置，所述背光模组提供显示光源给所述液晶面板，其特征在于，所述液晶面板采用如权利要求1所述的透反式液晶面板。
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