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CN105629558A - 一种具有反射区的液晶显示装置 - Google Patents

一种具有反射区的液晶显示装置 Download PDF

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CN105629558A
CN105629558A CN201610015025.8A CN201610015025A CN105629558A CN 105629558 A CN105629558 A CN 105629558A CN 201610015025 A CN201610015025 A CN 201610015025A CN 105629558 A CN105629558 A CN 105629558A
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liquid crystal
layer
crystal indicator
substrate
light
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张春倩
王超
薛景峰
龚强
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to CN201610015025.8A priority Critical patent/CN105629558A/zh
Priority to US15/075,190 priority patent/US20170199427A1/en
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    • G—PHYSICS
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    • 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
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    • 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
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Abstract

本发明公开了一种具有反射区的液晶显示装置。该液晶显示装置包括：相对设置的CF基板、TFT基板以及设置在CF基板和TFT基板之间的液晶层；反光层，设置在TFT基板和液晶层之间，外部光线穿过CF基板和液晶层后被反光层反射；波长转换层，设置在反光层和CF基板之间，用于将入射的光中的紫外光转换为绿光。通过上述方式，本发明能够减小紫外光的光量，并增加绿光的光量，从而降低其对眼睛的伤害，并且增加反射时的亮度。

Description

一种具有反射区的液晶显示装置
技术领域
本发明涉及显示技术领域，尤其是涉及一种具有反射区的液晶显示装置。
背景技术
现有的液晶显示器包括透射式、反射式和半反半透式。其中，透射式的液晶显示器由背光作为光源，经过下偏光板后形成偏振光，由液晶对其偏振方向进行偏转，再经过上偏振板。在透射式的液晶显示器中，背光功率占整个显示器的功耗的重要部分。
传统的反射式液晶显示器是在TFT(ThinFilmTransistor，薄膜晶体管)板上方增加反光板，通过其对外界环境光线的反射为面板显示提供光源。在反射式液晶显示器中，由于外界光线的强度不容易控制，加之光线两次通过面板，造成其亮度过低。
传统的半透半反式液晶显示器是将一个像素分为两部分，在外界光强较强时采用反射，较暗环境下开启背光，采用透射式。但是在反射显示时，仍然存在亮度较低的问题。
发明内容
本发明主要解决的技术问题是提供一种具有反射区的液晶显示装置，能够提高反射时的亮度。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种具有反射区的液晶显示装置，该液晶显示装置包括：相对设置的CF基板、TFT基板以及设置在CF基板和TFT基板之间的液晶层；反光层，设置在TFT基板和液晶层之间，外部光线穿过CF基板和液晶层后被反光层反射；波长转换层，设置在反光层和CF基板之间，用于将入射的光中的紫外光转换为绿光。
其中，波长转换层设置在CF基板和液晶层之间或者波长转换层设置在液晶层和反光层之间。
其中，波长转换层的表面设置为凹凸不平的形状，以提高波长转换层的光吸收率。
其中，波长转换层为(Sr,Ba)2Si4:Eu2+。
其中，反光层的表面设置为凹凸不平的形状，以改善光的反射角度。
其中，波长转换层为采用磁控溅射的方法将掺有Eu2+的(Sr,Ba)2Si4化合物沉积在反光层的表面。
其中，液晶显示装置还包括相位差薄膜和第一偏光板，相位差薄膜和第一偏光板依次设置在CF基板上，相位差薄膜用于补偿光的相位差，使得其可通过第一偏光板。
其中，液晶显示装置为全反射液晶显示装置。
其中，液晶显示装置为半透半反液晶显示装置，液晶显示装置包括透射区和反射区，波长转换层和反光层设置在反射区中，并且透射区TFT基板的厚度大于反射区的TFT基板的厚度。
其中，液晶显示装置包括设置于TFT基板外侧的第二偏光板和背光模组，且第二偏光板位于背光模组和TFT基板之间，背光模组向透射区提供光源，第二偏光板对入射的光进行偏振。
本发明的有益效果是：区别于现有技术的情况，本发明提供了一种具有反射区的液晶显示装置，该液晶显示装置包括相对设置的CF基板、TFT基板以及设置在CF基板和TFT基板之间的液晶层、反光层和波长转换层。其中，反光层设置在TFT基板和液晶层之间，外部光线穿过CF基板和液晶层后被反光层反射，波长转换层设置在反光层和CF基板之间，用于将入射的光中的紫外光转换为绿光。因此，本发明能够减小紫外光的光量，并增加绿光的光量，从而可以减少液晶显示器对紫外光的反光辐射，降低其对眼睛的伤害，并且减少功耗、增加反射时的亮度。
附图说明
图1是本发明实施例提供的一种具有反射区的液晶显示装置的结构示意图；
图2是波长转换层对光进行波长转换的原理图；
图3是本发明实施例提供的另一种具有反射区的液晶显示装置的结构示意图。
具体实施方式
请参阅图1，图1是本发明实施例提供的一种具有反射区的液晶显示装置的结构示意图。如图1所示，本发明实施例的液晶显示装置10包括CF基板101、TFT基板102、液晶层103、反光层104和波长转换层105。
其中，CF基板101和TFT基板102相对设置，液晶层103设置在CF基板101和TFT基板102之间。反光层104设置在TFT基板101和液晶层103之间，外部光线穿过CF基板101和液晶层103后被反光层104反射。波长转换层105设置在反光层104和CF基板101之间，用于将入射的光中的紫外光转换为绿光。
因此，本发明能够减小紫外光的光量，并增加绿光的光量，从而可以减少液晶显示器对紫外光的反光辐射，降低其对眼睛的伤害，并且减少功耗、增加反射时的亮度。
本实施例中，波长转换层105设置在液晶层103和反光层104之间。其中，波长转换层105的表面设置为凹凸不平的形状，以提高波长转换层的光吸收率。例如，本实施例中，波长转换层105的表面设置为锯齿状，在其他实施例中，还可以设置为波纹状等。
在其他实施例中，波长转换层105还可以设置在CF基板101和液晶层103之间。
进一步的，波长转换层105的材质为稀有金属离子，其在适当的载体中可以对光进行量子剪裁或波长转换，即将射入其中较短波长的光线转换为波长较长的光线后发出。其中，各种剪裁机制如图2所示，其中，箭头向下的实线、箭头向上的实线和虚线箭头分别表示激发、发射和能量传递过程。在太阳光谱中，除可见光外，还包含了紫外光，而紫外光在反射式液晶显示中是没有任何贡献的。若将其通过量子剪裁转换为可见光，如绿光，即可增加显示亮度，还会减少液晶显示装置对紫外光的反光辐射，降低其对眼睛的伤害。
本实施例中，波长转换层105的材质优选为掺有Eu2+的(Sr,Ba)2Si4化合物。优选为(Sr,Ba)2Si4:Eu2+，其中，(Sr,Ba)2Si4:Eu2+可吸收300-400nm的紫外光，并发射535nm左右的绿光，具体原理如前文所述。而绿光恰巧又是人眼最敏感的波长组成。本实施例的波长转换层105通过磁控溅射的方法将掺有Eu2+的(Sr,Ba)2Si4化合物沉积在反光层104的表面。则可以将外界入射的紫外光通过掺有Eu2+的(Sr,Ba)2Si4化合物的波长转换作用转换成绿光，并通过反光层104作为部分光源入射至液晶层103。而剩余的可见光部分则直接透射过波长转换层105，经反光层104反射作为光源入射至液晶层103。这样可以增加反射式液晶显示装置的亮度。如图1所示，还有部分入射的光经过波长转换层105后被直接发射出去。
本实施例中，还将反光层104的表面设置为凹凸不平的形状，以改善光的反射角度，增大视角。反光层104的表面的具体形状和波长转换层105的类似，在此不再赘述。
由于波长转换层105会对入射的光线的相位差有影响，因此本发明实施例还包括一相位差薄膜106，设置在CF基板101上方，用于补偿光的相位差。具体的，本实施例还包括偏光板107，偏光板107设置在相位差薄膜106上方。相位差薄膜106用于补偿波长转换层105、液晶层103以及反光层104造成的光线的相位差。设反射层104产生的相位差为фR，波长转换层105产生的相位差为фS，关态液晶层103(对于常黑模式，通常保证在关态时出射和入射的光偏振方向垂直，但是一旦加了电压，液晶偏转，透光率和加的电压有关，所以只能根据关态的情况去定义参数)产生的相位差为фLc，相位差薄膜106产生的相位差为ф，则有关系фR+фS+фLc+ф＝π/2。从而使出射的光达到适当的偏振态并经过偏光板107。
本实施例提供的是液晶显示装置为全反射液晶显示装置时的结构示意图。在本实施例中，反光层104和波长转换层105均和TFT基板102等宽。
本发明还提供了一种液晶显示装置为半透半反液晶显示装置的结构示意图。如图3所示，液晶显示装置300依然包括CF基板301、TFT基板302、液晶层303、反光层304、波长转换层305、相位差薄膜306以及偏光板307。其中，CF基板301、液晶层303、相位差薄膜306以及偏光板307分别与前文的CF基板101、液晶层103、相位差薄膜106以及偏光板107结构相同或相似，在此不再赘述。
本实施例的液晶显示装置300与前文所述的液晶显示装置100的不同之处在于，本实施例的液晶显示装置300还包括透射区T1和反射区S1，波长转换层305和反光层304设置在反射区S1中，并且透射区T1中的TFT基板302的厚度大于反射区S1中的TFT基板的厚度。具体实现方式为：在TFT基板302上，将第二金属层(即形成源极和漏极的金属层)和BottonITO(即公共电极层)中间的PLN层(平坦层)在透射区T1和反射区S1的厚度设置为不同。由此可以实现透射和反射的电光特性匹配。
进一步的，液晶显示装置300包括设置于TFT基板302外侧的偏光板308和背光模组309，且偏光板308位于背光模组309和TFT基板302之间，背光模组309向透射区T1提供光源，偏光板308对入射的光进行偏振。
在本实施例的半透半反式液晶显示装置中，在反射区S1中的反光板304的表面通过磁控溅射沉积波长转换层305。并且还可以根据需求来改变反射区S1和透射区T1的面积比，例如，若需要在在透射显示中达到更好的亮度和显示效果，则将增大透射区T1的面积，减小反射区S1的面积，相反的，若需要在反射显示时达到更好的亮度和显示效果，则将减小透射区T1的面积，增大反射区S1的面积。本实施例同样是将将反光板304和波长转换层305表面做成凹凸不平状，可以改善视角，增加波长转换层305对光的吸收。
本实施例的相位差薄膜306用于补偿反射区S1的液晶层303、波长转换层305和反光层304造成的光线的相位差，也用于补偿透射区T1的液晶层303造成的光线的相位差。例如，反射区S1的反光层304产生的相位差为фR，波长转换层305产生的相位差为фS，关态反射区液晶层产生的相位差为фLc1，透射区T1的液晶层303产生的相位差为фLc2，则фR+фS+фLc1＝фLc2，相位差薄膜306产生的相位差为ф，则фLc2+ф＝π/2。
综上所述，本发明能够减小紫外光的光量，并增加绿光的光量，从而可以减少液晶显示器对紫外光的反光辐射，降低其对眼睛的伤害，并且减少功耗、增加反射时的亮度。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

1.一种具有反射区的液晶显示装置，其特征在于，所述液晶显示装置包括：
相对设置的CF基板、TFT基板以及设置在所述CF基板和TFT基板之间的液晶层；
反光层，设置在所述TFT基板和所述液晶层之间，外部光线穿过所述CF基板和液晶层后被所述反光层反射；
波长转换层，设置在所述反光层和所述CF基板之间，用于将入射的光中的紫外光转换为绿光。
2.根据权利要求1所述的液晶显示装置，其特征在于，所述波长转换层设置在所述CF基板和所述液晶层之间或者所述波长转换层设置在所述液晶层和所述反光层之间。
3.根据权利要求1或2任一项所述的液晶显示装置，其特征在于，所述波长转换层的表面设置为凹凸不平的形状，以提高所述波长转换层的光吸收率。
4.根据权利要求3所述的液晶显示装置，其特征在于，所述波长转换层为(Sr,Ba)2Si4:Eu2+。
5.根据权利要求4所述的液晶显示装置，其特征在于，所述反光层的表面设置为凹凸不平的形状，以改善光的反射角度。
6.根据权利要求5所述的液晶显示装置，其特征在于，所述波长转换层为采用磁控溅射的方法将掺有Eu2+的(Sr,Ba)2Si4化合物沉积在所述反光层的表面。
7.根据权利要求1所述的液晶显示装置，其特征在于，所述液晶显示装置还包括相位差薄膜和第一偏光板，所述相位差薄膜和所述第一偏光板依次设置在所述CF基板上，所述相位差薄膜用于补偿光的相位差，使得其可通过所述第一偏光板。
8.根据权利要求7所述的液晶显示装置，其特征在于，所述液晶显示装置为全反射液晶显示装置。
9.根据权利要求7所述的液晶显示装置，其特征在于，所述液晶显示装置为半透半反液晶显示装置，所述液晶显示装置包括透射区和反射区，所述波长转换层和所述反光层设置在所述反射区中，并且所述透射区所述TFT基板的厚度大于所述反射区的所述TFT基板的厚度。
10.根据权利要求9所述的液晶显示装置，其特征在于，所述液晶显示装置包括设置于所述TFT基板外侧的第二偏光板和背光模组，且所述第二偏光板位于所述背光模组和所述TFT基板之间，所述背光模组向所述透射区提供光源，所述第二偏光板对入射的光进行偏振。
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