CN103969896A - 一种柔性显示面板和柔性显示器 - Google Patents

一种柔性显示面板和柔性显示器 Download PDF

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CN103969896A
CN103969896A CN201410148671.2A CN201410148671A CN103969896A CN 103969896 A CN103969896 A CN 103969896A CN 201410148671 A CN201410148671 A CN 201410148671A CN 103969896 A CN103969896 A CN 103969896A
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flexible
liquid crystal
board
flexible display
flexible base
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CN103969896B (zh
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赵伟利
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to PCT/CN2014/089029 priority patent/WO2015158123A1/zh
Priority to US14/436,488 priority patent/US9939669B2/en
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    • 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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
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    • 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
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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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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Liquid Crystal (AREA)

Abstract

本发明提供一种柔性显示面板和柔性显示器，属于柔性显示技术领域，其可解决现有的由于盒厚不均造成显示不良的问题。本发明的柔性显示面板，包括：相互对盒的第一柔性基板和第二柔性基板，设置在第一柔性基板和第二柔性基板之间的蓝相液晶层和设置在所述第二柔性基板靠近所述蓝相液晶层的一侧上间隔设置的条状电极；以及，设置在所述第二柔性基板背离所述蓝相液晶层的一侧上的反射层；和依次设置在所述第一柔性基板背离所述蓝相液晶层的一侧上的四分之一波片和偏光片，且所述偏光片的透光轴与所述四分之一波片的光轴的夹角为45度，所述条状电极与四分之一波片的光轴的夹角90度。本发明的柔性显示器包括上述柔性显示面板。

Description

一种柔性显示面板和柔性显示器
技术领域
本发明属于柔性显示技术领域，具体涉及一种柔性显示面板和柔性显示器。
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。液晶面板要实现正常的显示，就要求液晶对光具有偏振态的改变功能，即光经过液晶产生的光学延迟使得光的偏振态发生了改变，从而具有了明暗显示。而液晶的这种对光的作用又取决于液晶的光学延迟量Δnd(Δn为液晶慢轴和快轴方向折射率的差值，d为液晶盒的厚度)。理想状况下，整个液晶盒的盒厚d应该是相同的，这样才能保证显示效果的可控性和均匀性。因此，盒厚的控制在液晶显示中至关重要。
为了满足市场的需求，柔性显示的研究和产品越来越多，柔性液晶显示器也被广泛研究和尝试。对柔性液晶显示器而言，其中的一个关键问题就是挠曲时液晶盒的盒厚d很难维持，从而很难保证显示效果的可控性和均匀性。
发明内容
本发明所要解决的技术问题包括，针对现有的柔性显示面板盒厚不均的问题，提供一种避免由于盒厚不均产生的显示不良的柔性显示面板和柔性显示器。
解决本发明技术问题所采用的技术方案是一种柔性显示面板，其包括相互对盒的第一柔性基板和第二柔性基板，以及设置在第一柔性基板和第二柔性基板之间的蓝相液晶层。该柔性显示面板还包括：设置在所述第二柔性基板背离所述蓝相液晶层的一侧上的反射层和设置在所述第二柔性基板靠近所述蓝相液晶层的一侧上间隔设置的条状电极；以及，依次设置在第一柔性基板背离所述蓝相液晶层的一侧上的四分之一波片和偏光片，且偏光片的透光轴与四分之一波片的光轴的夹角为45度，所述条状电极与四分之一波片的光轴的夹角90度。
在本发明中，由于在第二柔性基板背离蓝相液晶层的一侧设置有反射层，此时当外界环境光通过第一柔性基板、蓝相液晶层、第二柔性基板后照射到反射层后，可以将环境光反射到第一柔性基板所在方向，也就说，外界环境光就相当于背光源，此时将该液晶显示面板应用于液晶显示器中，无需背光源，进而降低了液晶显示器的生产成本。同时，在在第一柔性基板和第二柔性基板之间填充的液晶为蓝相液晶层。其中，蓝相是一种介于各向同性态与胆甾相之间的一种液晶相，由于蓝相液晶的高分子稳定性，在不受电场作用的情况下，蓝相液晶为各向同性态，因此将蓝相液晶应用于显示器中，可使得该液晶显示面板具有视角大，暗态好的特点；同时，由于其加电后可产生各向异性的特点，使得该液晶显示器不需要其他类型的液晶显示面板所必需采用的取向层（即配向膜），从而降低了制造成本，简化了制造工艺。而且，采用蓝相液晶的液晶显示器的理论响应时间可达到毫秒级以下，从而大大的提高了响应时间，所以在第一柔性基板上无需制备彩色滤光层，可以通过时序控制来控制不同颜色的显示。因此，采用蓝相液晶的液晶显示器比普通的液晶显示器具有更高的对比度、更快的响应时间以及更宽的观看视角，极大的提升了液晶显示器的显示质量；但是，这样类型的液晶显示器存在驱动电压相对较高、光效率较低的缺点。最主要的，由于蓝相液晶的光电特性对盒厚不敏感，当柔性显示面板发生弯曲时，液晶盒的厚度发生变化也不会对显示效果影响很大，进而可以解决柔性显示面板由于液晶盒的厚度不均引起显示效果变差的问题。
优选的是，所述条状电极包括：像素电极和公共电极，其中，
所述像素电极和公共电极等间距间隔设置。
优选地，在所述第一柔性基板靠近所述蓝相液晶层的一侧还设置有板状电极，所述条状电极设置在板状电极上方，并通过绝缘层隔开，其中，
所述板状电极为像素电极，所述条状电极为公共电极；
或，
所述板状电极公共电极，所述条状电极为像素电极。
优选的是，所述条状电极的宽度在2-5um之间；
所述条状电极之间间隔的间距在4-10um之间。
优选的是，所述第一柔性基板与所述第二柔性基板形成的液晶盒的盒厚在2-5um之间。
优选的是，所述第一柔性基板包括第一柔性基底，所述第二柔性基板包括第二柔性基底，其中，
所述第一柔性基底和所述第二柔性基底的材料均为聚对苯二甲酸乙二醇酯、邻苯二甲酸酯、聚酰亚胺中的任意一种。
进一步优选的是，所述第一柔性基板还包括设于第一柔性基底与四分之一波片之间的彩色滤光层。
优选的是，所述反射层的材料为铝或银。
解决本发明技术问题所采用的技术方案是一种柔性显示装置，其包括上述柔性显示面板。
由于本发明的柔性显示装置包括上述柔性显示面板，故其可以避免盒厚不均对显示品质造成的影响且生产成本低。
优选的是，该柔性显示器还包括前置光源，所述前置光源设于所述柔性显示装置的前框上。
附图说明
图1为本发明的实施例1的柔性显示面板不加电压时的示意图；
图2为本发明的实施例1的柔性显示面板加电压时的示意图。
其中附图标记为：100、第一柔性基板；101、四分之一波片；102、偏光片；200、第二柔性基板；201、反射层；202、像素电极；203、公共电极；300、蓝相液晶层。
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作进一步详细描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例1：
结合图1和图2，本实施例提供一种柔性显示面板，其包括相互对盒的第一柔性基板100和第二柔性基板200，以及设置在第一柔性基板100和第二柔性基板200之间的蓝相液晶层300。该柔性显示面板还包括：设置在所述第二柔性基板200背离所述蓝相液晶层300的一侧上的反射层201和设置在所述第二柔性基板200靠近所述蓝相液晶层300的一侧上间隔设置的条状电极；以及，依次设置在第一柔性基板100背离所述蓝相液晶层300的一侧上的四分之一波片101和偏光片102，且偏光片102的透光轴与四分之一波片101的光轴的夹角为45度，所述条状电极与四分之一波片101的光轴的夹角90度。
在本实施例中，由于在第二柔性基板200背离蓝相液晶层300的一侧设置有反射层201，此时当外界环境光通过第一柔性基板100、蓝相液晶层300、第二柔性基板200后照射到反射层201后，可以将环境光反射到第一柔性基板100所在方向，也就说，外界环境光就相当于背光源，此时将该液晶显示面板应用于液晶显示器中，无需背光源，进而降低了液晶显示器的生产成本。同时，在第一柔性基板100和第二柔性基板200之间填充的液晶为蓝相液晶。其中，蓝相是一种介于各向同性态与胆甾相之间的一种液晶相，由于蓝相液晶的高分子稳定性，在不受电场作用的情况下，蓝相液晶为各向同性态，因此将蓝相液晶应用于显示器中，可使得该液晶显示面板具有视角大，暗态好的特点；同时，由于其加电后可以产生双折射的特点，使得该液晶显示器不需要其他类型的液晶显示面板所必须采用的取向层（即配向膜），从而降低了制造成本，简化了制造工艺。而且，采用蓝相液晶的液晶显示器的理论响应时间可达到毫秒级以下，从而大大的提高了响应时间，所以在第一柔性基板100上无需制备彩色滤光层，可以通过时序控制来控制不同颜色的显示。因此，采用蓝相液晶的液晶显示器比普通的液晶显示器具有更高的对比度、更快的响应时间以及更宽的观看视角，极大的提升了液晶显示器的显示质量；但是，这样类型的液晶显示器存在驱动电压相对较高、光效率较低的缺点。最主要的，由于蓝相液晶的光电特性对盒厚不敏感，当柔性显示面板发生弯曲时，液晶盒的厚度发生变化也不会对显示效果影响很大，进而可以解决柔性显示面板由于液晶盒的厚度不均引起显示效果变差的问题。
本实施例中，由于采用蓝相液晶层300，所以该柔性显示面板需要在第二柔性基板200上形成类似横向电场模式的电极结构。即，所述横向电场模式例如但不限于是IPS（In-Plane Switching，平面内切换）模式，ADS（Advanced Super Dimension Switch，高级超维场转换）模式。
具体的，在本实施例中，优选在所述第一柔性基板100靠近所述蓝相液晶层300的一侧设置的条状电极包括：像素电极202和公共电极203，其中，所述像素电极202和公共电极203等间距间隔设置，且所述像素电极202和所述公共电极203为形状和尺寸均完全相同，即各条状电极的长度相等、宽度相等、厚度相等。该电极结构形成的电场模式也就是IPS模式。进一步优选地，所述条状电极的宽度在2-5um之间。所述像素电极202和所述公共电极203之间间隔的间距在4-10um之间。
由于像素电极202和公共电极203的形状和尺寸均完全相同，且同层等间距设置，故在像素电极202和公共电极203之间形成电场是均匀分布的，若忽略电场的边沿效应，可认为电场的分布沿条状电极排列方向是周期分布的。
当然，在本实施例中，还可以优选地，在所述第一柔性基板100靠近所述蓝相液晶层300的一侧还设置板状电极，所述条状电极设置在板状电极上方并通过绝缘层隔开，其中，所述板状电极为像素电极202，此时条状电极为公共电极203；或所述条状电极为像素电极202，所述板状电极为公共电极203。该电极结构形成的电场模式也就是ADS模式。ADS模式的电场与IPS模式的电场相类似，在此就不再详细描述。
在本实施例中，为了使得柔性显示面板更加轻薄，优选地所述第一柔性基板100与所述第二柔性基板200形成的液晶盒的盒厚在2-5um之间。
在本实施例中，所述第一柔性基板100包括第一柔性基底，所述第二柔性基板200包括第二柔性基底，其中，所述第一柔性基底和所述第二柔性基底的材料均为聚对苯二甲酸乙二醇酯、邻苯二甲酸酯、聚酰亚胺中的任意一种。当然也可以采用其他柔性耐高温（400摄氏度）的树脂材料。
为了显示效果更好，本实施中优选地所述第一柔性基板100还包括设于第一柔性基底与四分之一波片101之间的彩色滤光层。
本实施例中第二柔性基板200远离蓝相液晶层300一侧的反射层201的材料可以为铝或银，或者也可以是由其他的反射性材料制成。
本实施例的柔性显示面板的工作过程分析如下：
图1为本实施例中反射式柔性显示面板不加电压时的示意图。由于蓝相液晶在不加电压时，呈光学各向同性态即各个方向的折射率都是一样的，如图1所示，此时蓝相液晶的折射率分布可等效为圆形。在本实施例中，偏光片102的透光轴与所述四分之一波片101的光轴的夹角为45度。（在此，令偏光片102的透过轴为45°，四分之一波片101的光轴为0°，延迟量为四分之一个波长）当外界环境光入射后，经过偏光片102成为45°的线性偏振光，该45°的线性偏振光经过0°放置的四分之一波片，偏振态改变90°，成为左旋圆偏振光；该左旋圆偏振光经过各向同性的液晶后不发生任何偏振态的改变；继续传播到反射层201，被反射层201反射后则左旋圆偏光成为右旋圆偏光；该右旋圆偏光再次经过各向同性的液晶后不发生任何偏振态的改变；继续传播经0°放置的四分之一波片101，右旋圆偏光偏振态改变90°成为-45°线偏光，该线偏光与偏光片102的透过轴正交，光无法透过，呈暗态。
图2为本实施例中柔性显示面板施加电压时的示意图。蓝相液晶加电时可等效认为被拉伸成粒状，且蓝相液晶的长轴与电场方向一致;由于条状电极与四分之一波片101的光轴成90度夹角，电场方向与电极方向垂直,因此蓝向液晶的长轴与四方之一波片平行。此时蓝相液晶各向异性，根据双折射原理（克尔效应），会对通过的光产生光学延迟量。根据克尔效应，Δn=λKE2。λ为入射光波长，K为克尔常数（K=12.68nm/V2），E为电场强度，数值等于上下电极电压U除以液晶盒厚d。给柔性显示面板施加一定电压，当Δnd=λ/4时，光的相位改变π/2，左旋偏振光成为线性偏振光。环境光入射后，经过偏光片102成为45°的线性偏振光，该线性偏振光经过0°放置的四分之一波片101，偏振态改变90°，成为左旋圆偏振光；该左旋圆偏振光经过长轴0°，λ/4光学延迟的蓝相液晶层300后左旋圆偏振光转变成-45°线性偏振光；继续传播到反射层201，被反射层201反射后线偏光无变化；-45°线偏光经过λ/4光学延迟的蓝相液晶层300和四分之一波片101后，偏振态改变90°成为45°线偏光，该45°线偏光可以从偏光片102射出。此时为亮态。由此不难看出，可以通过电压大小来控制Δnd的大小，进而得到不同的灰阶。
需要说明的是，在本实施例中，仅仅是以偏光片102的透过轴为45°，四分之一波片101的光轴为0°，延迟量为四分之一个波长为例对柔性显示面板的工作状态进行说明，当然只要是，偏光片102的透光轴与所述四分之一波片101的光轴的夹角为45度的柔性显示面板均可。在此不一一说明。
实施例2：
本实施例提供一种柔性显示器，其包括上述柔性显示面板，该柔性显示器可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
优选地，本实施例的柔性显示装置还包括前置光源，所述前置光源设于所述柔性显示装置的前框上。该前置光源可以将光照射到柔性显示面板上，这样即使在黑暗环境中也可以进行显示。
本实施例的显示装置中具有实施例1中的柔性显示面板，故其成本较低。
当然，本实施例的柔性显示器中还可以包括其他常规结构，如电源单元、显示驱动单元等。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (10)

1.一种柔性显示面板，包括：相互对盒的第一柔性基板和第二柔性基板，以及设置在第一柔性基板和第二柔性基板之间的蓝相液晶层，其特征在于，所述柔性显示面板还包括：
设置在所述第二柔性基板背离所述蓝相液晶层的一侧上的反射层和设置在所述第二柔性基板靠近所述蓝相液晶层的一侧上间隔设置的条状电极；以及，
依次设置在所述第一柔性基板背离所述蓝相液晶层的一侧上的四分之一波片和偏光片，且所述偏光片的透光轴与所述四分之一波片的光轴的夹角为45度，所述条状电极与四分之一波片的光轴的夹角90度。
2.根据权利要求1所述的柔性显示面板，其特征在于，所述条状电极包括：像素电极和公共电极，其中，
所述像素电极和公共电极等间距间隔设置。
3.根据权利要求1所述的柔性显示面板，其特征在于，在所述第一柔性基板靠近所述蓝相液晶层的一侧还设置有板状电极，所述条状电极设置在板状电极上方，并通过绝缘层隔开，其中，
所述板状电极为像素电极，所述条状电极为公共电极；
或，
所述板状电极为公共电极，所述条状电极为像素电极。
4.根据权利要求1至3中任意一项所述的柔性显示面板，其特征在于，所述条状电极的宽度在2-5um之间；
所述条状电极之间间隔的间距在4-10um之间。
5.根据权利要求1所述的柔性显示面板，其特征在于，所述第一柔性基板与所述第二柔性基板形成的液晶盒的盒厚在2-5um之间。
6.根据权利要求1所述的柔性显示面板，其特征在于，所述第一柔性基板包括第一柔性基底，所述第二柔性基板包括第二柔性基底，其中，
所述第一柔性基底和所述第二柔性基底的材料均为聚对苯二甲酸乙二醇酯、邻苯二甲酸酯、聚酰亚胺中的任意一种。
7.根据权利要求6所述的显示面板，其特征在于，所述第一柔性基板还包括设于第一柔性基底与四分之一波片之间的彩色滤光层。
8.根据权利要求1所述的柔性显示面板，其特征在于，所述反射层的材料为铝或银。
9.一种柔性显示器，其特征在于，包括权利要求1-8中任意一项所述的柔性显示面板。
10.根据权利要求9所述的柔性显示器，其特征在于，还包括前置光源，所述前置光源设于所述柔性显示装置的前框上。
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