WO2015003460A1 - 显示面板及透明显示装置 - Google Patents

显示面板及透明显示装置 Download PDF

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Publication number
WO2015003460A1
WO2015003460A1 PCT/CN2013/089275 CN2013089275W WO2015003460A1 WO 2015003460 A1 WO2015003460 A1 WO 2015003460A1 CN 2013089275 W CN2013089275 W CN 2013089275W WO 2015003460 A1 WO2015003460 A1 WO 2015003460A1
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Prior art keywords
liquid crystal
polarized light
display panel
crystal layer
display device
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PCT/CN2013/089275
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English (en)
French (fr)
Inventor
马新利
王强涛
方正
王海燕
田允允
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京东方科技集团股份有限公司
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Publication of WO2015003460A1 publication Critical patent/WO2015003460A1/zh

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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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent

Definitions

  • Embodiments of the present invention relate to a display panel and a transparent display device to which the display panel is applied. Background technique
  • TFT-LCD Thin Film Transistor-Liquid Crystal Display
  • the transparent display device has a certain degree of transparency, and information can be displayed on the display panel when a voltage is applied, and the background behind the transparent display device can be seen through the display panel when no voltage is applied. Therefore, the transparent display device is very suitable for use in construction and vehicle windows and shop windows.
  • the liquid crystal display panel generally includes an array substrate and an opposite substrate disposed opposite to each other, and a liquid crystal layer is disposed between the array substrate and the opposite substrate. Since the liquid crystal display panel itself does not emit light, it is also required to provide a backlight module to provide a light source for the liquid crystal display panel, and the light source provided by the backlight module is generally unpolarized light, so it is necessary to provide a lower polarizing plate on the side of the array substrate, in the opposite direction. An upper polarizing plate is disposed on the substrate side to control the transmission of light to realize screen display. However, this will greatly reduce the transmittance of the liquid crystal display panel, and the transmittance of the liquid crystal display panel is generally less than 7%.
  • a display panel includes an array substrate and a counter substrate disposed opposite to each other, and a liquid crystal layer is disposed between the array substrate and the opposite substrate, and the liquid crystal layer is equivalently formed into a quarter.
  • a liquid crystal wave plate
  • the thickness of the liquid crystal layer Where k is an integer, n.
  • the refractive index of the liquid crystal layer to ordinary light n e is the refractive index of the liquid crystal layer to extraordinary light
  • ⁇ is the wavelength of the incident light.
  • a spacer is disposed between the array substrate and the opposite substrate, and the thickness of the liquid crystal layer is controlled by the spacer.
  • the liquid crystal in the liquid crystal layer is a cholesteric liquid crystal.
  • the long axis of the liquid crystal molecules in the liquid crystal layer is parallel to the display panel when not powered; after the power is applied, the long axis of the liquid crystal molecules in the liquid crystal layer is perpendicular to the display panel.
  • a transparent display device to which any of the above display panels is applied.
  • the transparent display device includes a polarized light source and any one of the above display panels, wherein the polarized light source provides elliptically polarized light or circularly polarized light to the display panel, and an upper polarizing plate is disposed on a side of the display panel away from the polarized light source.
  • the transmission axis of the upper polarizing plate is perpendicular to the vibration direction of the linearly polarized light emitted from the liquid crystal layer.
  • the polarized light source includes a backlight module that provides unpolarized light, and a polarizer and a quarter wave plate that are sequentially disposed on the unpolarized light path.
  • the pass axis of the polarizer is 45 with the optical axis of the quarter wave plate.
  • the polarized light source provides circularly polarized light.
  • the polarized light source is disposed directly behind, behind, behind, or below the display panel.
  • a portion of the polarized light provided by the polarized light source is directly incident on the display panel, and a portion of the polarized light is incident on the display panel and is reflected into the display panel; by controlling the light transmission axis of the polarizer and the light of the quarter wave plate
  • the angle of the axis is such that the direction of the polarization of the polarized light directly incident on the display panel is opposite to the direction of the optical axis of the liquid crystal layer and the direction of the polarization of the polarized light incident on the other region is the same as the direction of the optical axis of the liquid crystal layer.
  • FIG. 1 is a schematic structural view of a transparent display device according to an embodiment of the present invention.
  • FIG. 2 is a schematic view showing the optical path of the transparent display device when the power is not applied in the embodiment of the present invention
  • FIG. 3 is a schematic view showing the arrangement of the liquid crystal molecules of the transparent display device when the power is not applied in the embodiment of the present invention.
  • Embodiments of the present invention provide a display panel including an array substrate and a counter substrate disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the opposite substrate, the liquid crystal layer being equivalently formed into a quarter Liquid crystal wave plate.
  • the display panel provided in the present embodiment as a whole can be equivalent to a quarter liquid crystal wave plate, and can be combined with a polarized light source and a polarizing plate which will be described later to form a transparent display device.
  • the phase of the polarized light is changed by the quarter liquid crystal wave plate, thereby improving the transparent display effect of the transparent display device.
  • the transparent display device provided by the embodiment of the present invention includes a display panel 4 and a polarization light source, and the polarization light source provides elliptically polarized light or circularly polarized light to the display panel 4.
  • the display panel 4 includes an array substrate 8 and a counter substrate 6 disposed opposite each other.
  • the array substrate 8 and the counter substrate 6 have a liquid crystal layer, and the liquid crystal layer is equivalently formed into a quarter liquid crystal wave plate.
  • an upper polarizing plate 5 is disposed on a side of the display panel away from the polarizing light source, and the transmission axis of the upper polarizing plate 5 is substantially perpendicular to the vibration direction of the linearly polarized light emitted from the quarter liquid crystal wave plate, so as to be opposite to the display.
  • the light emitted from the panel is strobed.
  • the upper polarizing plate 5 is disposed on the opposite substrate 6 side.
  • the elliptically polarized light or the circularly polarized light provided by the polarized light source forms linearly polarized light after passing through a quarter-half liquid crystal wave plate equivalently formed by the liquid crystal layer
  • the transmission axis of the upper polarizing plate 5 on the substrate side is substantially perpendicular to the vibration direction of the linearly polarized light emitted from the quarter liquid crystal wave plate, so that the emitted linearly polarized light cannot pass through the upper polarizing plate on the opposite substrate side. 5, so the performance is dark.
  • the elliptically polarized light or the circularly polarized light provided by the polarized light source passes through the liquid crystal layer, and the polarization state does not change, and is still elliptically polarized light or circularly polarized light, which can be partially transmitted through the opposite substrate 6.
  • the polarizing plate is expressed in a bright state to realize a screen display effect.
  • the transparent display device does not need to be provided with a polarizing plate on the side of the array substrate, thereby improving the transmittance of the display panel 4, greatly improving the transparency of the transparent display device, and thereby improving the user experience.
  • the polarized light source includes a backlight module 1 that provides unpolarized light, and a polarizer 2 and a quarter wave plate 3 are sequentially disposed on the unpolarized light path provided by the backlight module 1.
  • the unpolarized light passes through the polarizer 2 to form linearly polarized light.
  • the linearly polarized light can pass through the quarter wave.
  • elliptically polarized light or circularly polarized light is formed. For example, when the light transmission axis of the polarizer 2 is 45 with the optical axis of the quarter wave plate 3.
  • the linearly polarized light passes through the quarter-wave plate 3 to form circularly polarized light.
  • the position of the polarized light source is disposed behind the display panel 4, i.e., the position of the polarized light source is disposed on one side of the array substrate of the display panel 4.
  • the polarized light source may be disposed directly behind, behind, behind, or below the display panel 4.
  • the thickness d of the liquid crystal layer can be set according to the following formula:
  • the refractive index, ⁇ is the wavelength of the incident light. It can be seen that the minimum thickness of the liquid crystal layer is
  • the thickness is an odd multiple of the minimum thickness.
  • a spacer is disposed between the array substrate 8 and the opposite substrate 6, and the thickness of the liquid crystal layer can be controlled by providing a spacer of a corresponding height.
  • the arrangement of the liquid crystal molecules 7 in the liquid crystal layer when uncharged is as shown in FIG. That is, when the power is not applied, the long axis of the liquid crystal molecules 7 is parallel to the display panel 4, and the liquid crystal layer is equivalently formed.
  • a quarter-half liquid crystal wave plate controls the transmission axis of the upper polarizing plate 5 on the opposite substrate side such that the direction of vibration of the linearly polarized light passing through the liquid crystal layer is perpendicular to the transmission axis of the upper polarizing plate 5, thereby preventing polarized light Through the liquid crystal display panel 4, it appears as a dark state.
  • the long axis of the liquid crystal molecules 7 is perpendicular to the display panel 4, and elliptically polarized light or circularly polarized light is transmitted from the optical axis direction of the quarter liquid crystal wave plate, and no birefringence occurs, and the phase delay of the liquid crystal layer Zero, the polarization state of the incident light does not change, still elliptically polarized or circularly polarized.
  • the liquid crystal layer may be a bile phase liquid crystal.
  • biliary liquid crystals it behaves as an optically active substance.
  • the direction of the incident polarized light is the same as the direction of the optical axis of the liquid crystal layer, the incident polarized light is reflected.
  • the direction of the optically polarized light is opposite to the direction of the optical axis of the liquid crystal layer, the incident polarized light can be transmitted.
  • the liquid crystal layer Therefore, in this embodiment, a part of the polarized light provided by the polarized light source is directly incident on the display panel 4, and a part of the polarized light is incident on the display area 4 and then reflected into the display panel 4.
  • the optical rotation direction of the polarized light directly incident on the display panel 4 can be made opposite to the optical rotation direction of the liquid crystal layer and made incident to
  • the optical rotation direction of the polarized light in the other regions is the same as the optical rotation direction of the liquid crystal layer, so that the optical rotation direction of the crystal layer incident thereon is opposite, so that it can be incident on the display panel 4, thereby achieving an effect of increasing the luminance and contrast of the transparent display device.
  • the optical rotation direction can be made
  • the optical axis of the liquid crystal layer is opposite in direction.
  • the optical rotation direction and the liquid crystal layer can be made. The direction of the rotation is the same.
  • the polarized light source provides right-handed circularly polarized light or right-handed elliptically polarized light directly incident on the display panel 4, providing left-handed circularly polarized light or left-handed elliptically polarized light incident on other regions.

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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)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

一种显示面板（4）及透明显示装置。显示面板（4）包括相对设置的阵列基板（8）以及对向基板（6），阵列基板（8）与对向基板（6）之间具有液晶层，液晶层等效形成四分之一液晶波片。

Description

显示面板及透明显示装置 技术领域
本发明的实施例涉及一种显示面板以及应用该显示面板的透明显示装 置。 背景技术
薄月莫晶体管液晶显示器 ( Thin Film Transistor-Liquid Crystal Display, TFT-LCD ) 由于具有画面稳定、 图像逼真、 无辐射、 节省空间以及节省能耗 等优点， 被广泛应用于电视、 手机、 显示器等电子产品中， 已占据了平面显 示领域的主导地位。
随着信息技术的发展， 透明显示装置愈发引起人们的关注， 其能够看见 位于透明显示装置后方的物体并能够实现画面显示。 透明显示装置具有一定 程度的穿透性， 施加电压时可在显示面板上显示信息， 在不施加电压时可透 过显示面板看到透明显示装置后方的背景。 因此， 透明显示装置非常适用于 建筑与车辆窗户及商店橱窗等场合。
液晶显示面板通常包括相对设置的阵列基板以及对向基板， 阵列基板与 对向基板之间设置有液晶层。 由于液晶显示面板本身不发光， 因此还需要设 置背光模组为液晶显示面板提供光源， 而背光模组提供的光源一般为非偏振 光， 因此需要在阵列基板侧设置有下偏振片，在对向基板侧设置有上偏振片， 从而控制光线的透过， 实现画面显示。 但是， 这样会使液晶显示面板的透过 率大大降低， 液晶显示面板的透过率一般小于 7%。
透明显示装置要求液晶显示面板在不损失其色域及对比度的前提下， 最 大程度的提高液晶显示面板的透过率， 使观看者能够清晰的看到透明显示装 置后方的物品。 因此， 在当前这样低的透过率情况下制作透明显示装置， 透 过率往往不能达到要求， 会影响严重透明显示装置的透明效果， 降低用户体 验。 发明内容 根据本发明实施例的一个方面， 提供一种显示面板， 包括相对设置的阵 列基板以及对向基板， 所述阵列基板与对向基板之间具有液晶层， 所述液晶 层等效形成四分之一液晶波片。
例如， 所述液晶层的厚度
Figure imgf000004_0001
； 其中， k为整数， n。为液晶层对 寻常光的折射率， ne为液晶层对非常光的折射率， λ为入射光的波长。
例如， 所述阵列基板与对向基板之间设置有隔垫物， 通过所述隔垫物控 制液晶层的厚度。
例如， 所述液晶层中的液晶为胆 <甾型液晶。
例如，所述液晶层中的液晶分子的长轴在未加电时与所述显示面板平行； 加电后所述液晶层中的液晶分子的长轴与所述显示面板垂直。
根据本发明实施例的另一个方面， 提供了一种应用上述任意一种显示面 板的透明显示装置。 该透明显示装置， 包括偏振光源以及上述任意一种显示 面板， 所述偏振光源为显示面板提供橢圓偏振光或者圓偏振光， 并且所述显 示面板远离所述偏振光源的一侧设置有上偏振片。
例如， 所述上偏振片的透光轴与从所述液晶层出射的线偏振光的振动方 向垂直。
例如， 所述偏振光源包括提供非偏振光的背光模组以及依次设置在所述 非偏振光光路上的起偏器以及四分之一波片。
例如， 所述起偏器的透光轴与所述四分之一波片的光轴成 45。夹角， 所 述偏振光源提供圓偏振光。
例如， 所述偏振光源设置在所述显示面板的正后方、 侧后方、 后上方或 者后下方。
例如， 所述偏振光源提供的偏振光一部分直接入射到显示面板， 一部分 入射到其他区域后反射入显示面板； 通过控制所述起偏器的透光轴与所述四 分之一波片的光轴的夹角， 使得直接入射到显示面板的偏振光的旋光方向与 液晶层的旋光方向相反并使得入射到其他区域的偏振光的旋光方向与液晶层 的旋光方向相同。 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 筒单地介绍，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是本发明实施例中透明显示装置的结构示意图；
图 2是本发明实施例中未加电时透明显示装置的光路示意图； 以及 图 3是本发明实施例中未加电时透明显示装置的液晶分子排列示意图。 具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合附图， 对本发明实施例的技术方案进行清楚、 完整地描述。 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。
本发明的实施例提供了一种显示面板， 该显示面板包括相对设置的阵列 基板和对向基板， 在阵列基板与对向基板之间设置有液晶层， 该液晶层等效 形成四分之一液晶波片。 此时， 本实施例中所提供的显示面板整体可以等效 为四分之一液晶波片， 可以与后面将要描述的偏振光源以及偏振片配合形成 透明显示装置。 利用四分之一液晶波片对偏振光的相位进行改变， 从而改善 透明显示装置的透明显示效果。
下面以应用上述显示面板的透明显示装置为例对根据发明实施例的显示 面板以及透明显示装置加以详细说明。
如图 1所示， 本发明实施例所提供的透明显示装置包括显示面板 4以及 偏振光源， 偏振光源为显示面板 4提供橢圓偏振光或者圓偏振光。 如图 3所 示， 显示面板 4包括相对设置的阵列基板 8以及对向基板 6, 阵列基板 8与 对向基板 6之间具有液晶层， 液晶层等效形成四分之一液晶波片。 此外， 在 显示面板远离偏振光源的一侧设置有上偏振片 5 , 上偏振片 5的透光轴与从 四分之一液晶波片出射的线偏振光的振动方向大致垂直， 以对从显示面板出 射的光线进行选通。 例如，如图 3所示， 上偏振片 5设置在对向基板 6—侧。
如图 2中所示， 当液晶层不加电时， 偏振光源所提供的橢圓偏振光或者 圓偏振光在经过液晶层等效形成的四分之一液晶波片后， 形成线偏振光， 对 向基板侧的上偏振片 5的透光轴与从四分之一液晶波片出射的线偏振光的振 动方向大致垂直，从而使出射的线偏振光不能透过对向基板侧的上偏振片 5, 因此表现为暗态。
当液晶层加电后， 偏振光源所提供的橢圓偏振光或者圓偏振光经过液晶 层后， 偏振态不发生改变， 仍为橢圓偏振光或者圓偏振光， 可以部分透过对 向基板 6上的偏振片， 从而表现为亮态， 实现画面显示效果。 在本发明的实 施例中， 透明显示装置由于无需在阵列基板侧设置偏振片， 从而提升了显示 面板 4的透过率， 大大改善了透明显示装置的透明效果， 进而达到提升用户 体验的效果。
例如， 上述偏振光源包括提供非偏振光的背光模组 1 , 在背光模组 1提 供的非偏振光的光路上依次设置有起偏器 2以及四分之一波片 3。 非偏振光 经过起偏器 2后形成线偏振光， 通过控制起偏器 2的透光轴与四分之一波片 3的光轴的夹角， 可以使线偏振光经过四分之一波片 3后形成橢圓偏振光或 者圓偏振光。 例如， 当起偏器 2的透光轴与四分之一波片 3的光轴成 45。夹 角时， 线偏振光经过四分之一波片 3后会形成圓偏振光。 例如， 偏振光源的 位置设置在显示面板 4的后方， 即偏振光源的位置设置在显示面板 4的阵列 基板的一侧。 例如偏振光源可以设置在显示面板 4的正后方、 侧后方、 后上 方或者后下方。
由于液晶层需要等效形成四分之一液晶波片， 因此需要为液晶层设定特 他 定的厚度， 使透射的寻常光 0光与非常光 e光产生奇数倍的四分之一波长的 光程差。 液晶层的厚度 d可以根据以下公式设定：
Figure imgf000006_0001
其中， k为整数， n。为液晶层对寻常光的折射率， 为液晶层对非常光
的折射率， λ为入射光的波长。 可见， 液晶层的最小厚度为
Figure imgf000006_0002
厚度均为最小厚度的奇数倍。在阵列基板 8与对向基板 6之间设置有隔垫物， 液晶层的厚度可以通过设置相应高度的隔垫物来控制。
本实施例中， 在未加电时液晶层中的液晶分子 7的排列方式如图 3中所 示。 即在未加电时， 液晶分子 7的长轴与显示面板 4平行， 液晶层等效形成 四分之一液晶波片， 控制对向基板侧的上偏振片 5的透光轴使得通过液晶层 后的线偏振光的振动方向与上偏振片 5的透光轴垂直， 这样可以阻止偏振光 通过液晶显示面板 4,从而表现为暗态。在加电后，液晶分子 7的长轴与显示 面板 4垂直，橢圓偏振光或者圓偏振光从四分之一液晶波片的光轴方向透过， 不产生双折射现象， 液晶层的相延迟为零， 入射光的偏振态不发生改变， 仍 为橢圓偏振光或者圓偏振光。
例如， 液晶层可以为胆<甾相液晶。 对于胆 相液晶而言， 其表现为旋光 物质。 当入射的偏振光的旋光方向与液晶层的旋光方向相同时， 则入射的偏 振光会被反射， 当入射的偏振光的旋光方向与液晶层的旋光方向相反时， 则 入射的偏振光可以透过液晶层。 因此， 本实施例中， 偏振光源提供的偏振光 一部分直接入射到显示面板 4, 一部分入射到其他区域后反射入显示面板 4。 通过控制起偏器 2的透光轴与四分之一波片 3的光轴的夹角， 可以使得直接 入射到显示面板 4的偏振光的旋光方向与液晶层的旋光方向相反并且使得入 射到其他区域的偏振光的旋光方向与液晶层的旋光方向相同， 这样入射到其 晶层的旋光方向相反， 从而可以入射到显示面板 4中， 进而达到增加透明显 示装置的辉度以及对比度的效果。 例如， 对于直接入射到显示面板 4的偏振 光而言，通过将起偏器 2的透光轴与四分之一波片 3的光轴的夹角设置为 45 度， 可以使其旋光方向与液晶层的旋光方向相反。 例如， 对于入射到其他区 域的偏振光而言， 通过将起偏器 2的透光轴与四分之一波片 3的光轴的夹角 设置为 135度， 可以使其旋光方向与液晶层的旋光方向相同。 例如， 偏振光 源提供右旋圓偏振光或者右旋橢圓偏振光直接入射到显示面板 4, 提供左旋 圓偏振光或者左旋橢圓偏振光入射到其他区域。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、一种显示面板， 包括相对设置的阵列基板以及对向基板， 所述阵列基 板与对向基板之间具有液晶层， 所述液晶层等效形成四分之一液晶波片。
2、 根据权利要求 1 所述的显示面板， 其中所述液晶层的厚度
2k+l λ
n0-ne 4； 其中， k为整数， 为液晶层对寻常光的折射率， 为液晶层 对非常光的折射率， λ为入射光的波长。
3、根据权利要求 2所述的显示面板，其中所述阵列基板与对向基板之间 设置有隔垫物， 通过所述隔垫物控制液晶层的厚度。
4、根据权利要求 1-3任意一项所述的显示面板， 其中所述液晶层中的液 晶为胆甾型液晶。
5、根据权利要求 1-4任意一项所述的显示面板， 其中所述液晶层中的液 晶分子的长轴在未加电时与所述显示面板平行； 加电后所述液晶层中的液晶 分子的长轴与所述显示面板垂直。
6、一种透明显示装置， 包括偏振光源以及根据权利要求 1-5任意一项所 述的显示面板， 所述偏振光源为显示面板提供橢圓偏振光或者圓偏振光， 并 且所述显示面板远离所述偏振光源的一侧设置有上偏振片。
7、根据权利要求 6所述的透明显示装置，其中所述上偏振片的透光轴与 从所述液晶层出射的线偏振光的振动方向垂直。
8、根据权利要求 6-7任一项所述的透明显示装置， 其中所述偏振光源包 括提供非偏振光的背光模组以及依次设置在所述非偏振光光路上的起偏器以 及四分之一波片。
9、根据权利要求 8所述的透明显示装置，其中所述起偏器的透光轴与所 述四分之一波片的光轴成 45。夹角， 所述偏振光源提供圓偏振光。
10、 根据权利要求 6-9任意一项所述的透明显示装置， 其中所述偏振光 源设置在所述显示面板的正后方、 侧后方、 后上方或者后下方。
11、 根据权利要求 8所述的透明显示装置， 其中所述偏振光源提供的偏 振光一部分直接入射到显示面板，一部分入射到其他区域后反射入显示面板； 通过控制所述起偏器的透光轴与所述四分之一波片的光轴的夹角， 使得 直接入射到显示面板的偏振光的旋光方向与液晶层的旋光方向相反并使得入 射到其他区域的偏振光的旋光方向与液晶层的旋光方向相同。
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