WO2013166807A1 - 蓝相液晶面板和显示装置 - Google Patents

蓝相液晶面板和显示装置 Download PDF

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Publication number
WO2013166807A1
WO2013166807A1 PCT/CN2012/083098 CN2012083098W WO2013166807A1 WO 2013166807 A1 WO2013166807 A1 WO 2013166807A1 CN 2012083098 W CN2012083098 W CN 2012083098W WO 2013166807 A1 WO2013166807 A1 WO 2013166807A1
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Prior art keywords
liquid crystal
prism layer
phase liquid
blue phase
substrate
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English (en)
French (fr)
Inventor
谢畅
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02F1/133553—Reflecting elements
    • G02F1/133555—Transflectors
    • 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
    • G02F1/13793—Blue phases

Definitions

  • Embodiments of the present invention relate to a transflective blue phase liquid crystal panel and a display device. Background technique
  • the liquid crystal display device can be classified into three types: transmissive, reflective, and transflective.
  • Transflective liquid crystal display devices have the advantages of both transmissive and reflective liquid crystal display devices, and are therefore widely used in display devices for electronic products.
  • the blue phase is a liquid crystal phase between the isotropic phase and the bile phase.
  • the temperature range of its existence is usually very narrow, and it is only about the temperature range of rc.
  • the temperature range of the blue phase liquid crystal after the stabilization of the polymer is greatly broadened, and the temperature range of use as a liquid crystal display material can be basically satisfied.
  • the blue phase liquid crystal display has the following characteristics. (1) The blue phase liquid crystal display has a large viewing angle and a dark state display effect. (2) The theoretical response time of blue-phase liquid crystal displays is extremely short, and can reach below milliseconds. (3) The blue phase liquid crystal display does not require an alignment layer necessary for various other liquid crystal displays, thereby reducing the manufacturing cost and simplifying the manufacturing process.
  • the existing blue phase liquid crystal display generally adopts a double cell gap structure to ensure that the optical path difference between the transmissive area and the reflective area is uniform, and there are two major technical problems, namely, high driving voltage and light efficiency. low. Summary of the invention
  • Embodiments of the present invention provide a blue phase liquid crystal panel and a display device for reducing a driving voltage of a transflective blue phase liquid crystal panel and improving light efficiency.
  • a blue phase liquid crystal panel comprising: an opposite first substrate and a second substrate; a blue phase liquid crystal layer interposed between the two substrates; and a first polarization located outside the first substrate a second polarizing plate located outside the second substrate; located inside the array of the first substrate Formally arranged pixel electrodes; a common electrode located inside the second substrate; a first prism layer between the blue phase liquid crystal layer and the first polarizing plate; located in the blue phase liquid crystal layer and the first a second prism layer between the two polarizers.
  • a pixel area in which each of the pixel electrodes is located is divided into a transmissive area and a reflective area; an incident light of the vertical substrate passes through the first prism layer at a portion of the transmissive area and is located at the reflective area through the second prism layer The refraction angle of the portion is large such that the light path difference generated by the light of the transmissive region and the reflective region is the same through the blue phase liquid crystal layer.
  • Another aspect of the present invention also provides a display device including the above-described blue phase liquid crystal panel.
  • the transflective blue phase liquid crystal panel and the display device provided by the embodiment of the present invention can generate a uniform hook by being energized by a pixel electrode disposed inside the first substrate and a common electrode disposed inside the second substrate.
  • the embodiment of the present invention adds the first prism layer and the second according to the type of the blue phase liquid crystal panel
  • the prism layer deflects the light incident on the original vertical substrate, so that the oblique light rays will have an optical path difference corresponding to the blue phase liquid crystal layer driven by the vertical electric field, thereby controlling the light by the change of the vertical electric field intensity.
  • the transmittance is reduced by the vertical electric field, so that the driving voltage is lowered and the light efficiency is improved.
  • the manufacturing process can be simplified.
  • FIG. 1 is a schematic structural view of a transflective blue phase liquid crystal panel provided with no voltage when the voltage is applied;
  • FIG. 2 is a schematic view showing the structure of the transflective blue phase liquid crystal panel shown in FIG. 1 when a voltage is applied.
  • the blue phase liquid crystal panel of the prior art is driven by a horizontal electric field, and the driving voltage of the blue phase liquid crystal panel is relatively high. Since the power line of the vertical electric field (i.e., the electric field perpendicular to the substrate) is more uniform, which is advantageous for lowering the driving voltage of the blue phase liquid crystal panel, the embodiment of the present invention provides a blue phase liquid crystal panel driven by a vertical electric field.
  • the blue phase liquid crystal molecules have an isotropic property when no voltage is applied; when a voltage is applied, the blue phase liquid crystal molecules have birefringence characteristics in one direction, and the blue phase liquid crystal molecules are aligned in the direction of the electric field.
  • the blue phase liquid crystal molecules Due to the above characteristics of the blue phase liquid crystal molecules, if only the type of the driving electric field is changed, the normal display function of the blue phase liquid crystal panel cannot be realized. Specifically, when no voltage is applied, the blue phase liquid crystal molecules are in an isotropic state, so that the incident light passing through the blue phase liquid crystal layer will not cause an optical path difference, and the polarization direction will not be changed. When a voltage is applied, the blue phase liquid crystal molecules have a long axis along the direction of the power line of the vertical electric field under the action of a vertical electric field, so that the incident light passing through the blue phase liquid crystal layer will not cause an optical path difference, and the polarization direction cannot be changed. . Since the polarization direction of the incident light does not change regardless of whether or not a voltage is applied, the transmittance of the light cannot be controlled by the magnitude of the applied voltage, and the display of the blue phase liquid crystal panel cannot be realized.
  • the embodiment of the present invention provides a transflective blue phase liquid crystal panel.
  • the present invention provides a transflective blue phase liquid crystal panel.
  • the LCD panel package The first substrate 001 and the second substrate 002 are opposed to each other, and the blue phase liquid crystal layer 003 is sandwiched between the two substrates, and the first polarizing plate 004 located outside the first substrate is located outside the second substrate.
  • a distance between the first substrate 001 and the second substrate 002 is maintained, for example, by a columnar or spherical spacer, and a liquid crystal cell is formed by a sealant or the like.
  • the deflection directions of the first polarizing plate 004 and the second polarizing plate 005 are perpendicular to each other.
  • the first substrate 001 and the second substrate 002 are, for example, a glass substrate, a quartz substrate, or a plastic substrate.
  • the liquid crystal panel further includes: a pixel electrode 006 disposed inside the first substrate 001 and arranged in an array, a common electrode 007 located inside the second substrate 002, and the blue phase liquid crystal layer 003 and the first A first prism layer 101 between the polarizing plates 004 is located between the blue phase liquid crystal layer 003 and the second polarizing plate 005.
  • the first substrate 001 may also be formed with a plurality of gate lines and a plurality of data lines (not shown) which cross each other to define a plurality of pixel regions which are arranged in a matrix.
  • Each of the pixel units includes a pixel electrode and a switching element such as a thin film transistor.
  • the gate of the thin film transistor is connected to the corresponding gate line
  • the source is connected to the corresponding data line
  • the drain is connected to the pixel electrode of the corresponding pixel region.
  • the pixel area in which each of the pixel electrodes 006 is located is divided into a transmissive area and a reflective area. a portion of the first prism layer 101 located in the transmissive region for deflecting light incident through the first polarizing plate 004, and a portion of the second prism layer 102 located in the reflective region for The light incident on the second polarizing plate 005 and the emitted light are deflected.
  • the incident light of the vertical substrate passes through the first prism layer 101 at a portion of the transmissive region that is larger than a portion of the second prism layer 102 that is located at the reflective region, such that the transmissive region and the reflective region
  • the light path generated by the blue phase liquid crystal layer 003 is the same.
  • the portion of the first prism layer 101 located at the reflection region does not function, the portion of the first prism layer 101 located at the reflection region may be of any shape. Of course, it is also possible if the first prism layer 101 contains only a portion located in the transmissive region.
  • the second prism layer 102 may exist only in the reflective area.
  • the portion of the second prism layer 102 located in the transmissive region is identical to the portion of the first prism layer 101 located in the transmissive region.
  • the "relative arrangement" means that one surface having the same shape of both prism layers serves as the inner side of each prism layer, and the other surface having the same shape serves as the outer side of each prism layer. For example, refer to Figure 1. 2.
  • the portion of the first prism layer 101 located in the transmissive region and the portion of the second prism layer 102 located in the transmissive region have the same shape, and both planes and planes are included, and the planes of the two are the outer sides of the respective prism layers.
  • the folded faces of both are the inner sides of the respective prism layers; of course, the reverse is also possible.
  • the portion of the first prism layer 101 located in the transmissive region and the portion of the second prism layer 102 located at the reflective region are generally not uniform, the shape of the portion of the second prism layer 102 located in the transmissive region and the portion thereof located in the reflective region are also Inconsistent.
  • the blue phase liquid crystal layer 003 includes blue phase liquid crystal molecules.
  • the blue phase liquid crystal may be a polymer stabilized blue phase liquid crystal, a double liquid crystal cell type blue phase liquid crystal or the like.
  • Each of the first prism layer 101 and the second prism layer 102 is a transparent layer of any shape capable of refracting light.
  • the two faces of the portion of the first prism layer 101 located in the transmissive area are respectively flat.
  • a symmetric triangular wavy fold; the two faces of the portion of the second prism layer 102 located in the reflective region are plane and symmetrical triangular wavy folds, respectively.
  • the "symmetric triangular wavy fold" is a folded surface having a symmetrical triangular wave cross section and parallel lines of adjacent sides, and the sides of each side of the symmetrical triangular wavy fold are inclined The angles are all equal.
  • side tilt angle refers to the angle between the side surface and the plane of the substrate.
  • the side angles of the symmetrical triangular wave-shaped folds of the first prism layer 101 at the portion of the transmissive region are all equal, denoted by a, and the second prism layer 102 is located at a symmetrical triangle of the portion of the reflective region.
  • the side angles of the wavy folds are equal, indicated by a2.
  • the portion of the second prism layer 102 located in the transmissive region is identical to the portion of the first prism layer 101 located in the transmissive region, so that the two faces of the portion of the second prism layer 102 located in the transmissive region are also planar and symmetric triangles, respectively. Wavy folds.
  • the plane of the first prism layer 101 is the outer side of the first prism layer 101, and the symmetrical triangular-shaped fold surface is the inner side; and the second prism layer 102 (including: a portion located in the transmissive area and a portion located in the reflective area) The plane is the outer side of the second prism layer 102, and the symmetrical triangular wavy fold is taken as the inner side. This causes the light to pass through the first prism layer or the second prism layer and change the direction of propagation of the primary light only when passing through the symmetrical triangular undulations.
  • the folded surface of the first prism layer 101 is the outer side of the first prism layer 101
  • the plane is the inner side
  • the folded surface of the second prism layer 102 is the outer side of the second prism layer 102
  • the plane is also the inner side.
  • the incident light of the vertical substrate passes through the portion of the first prism layer 101 where the portion of the transmissive region is larger than the portion of the second prism layer 102 that is located at the reflective region, and is implemented in the present invention.
  • the first prism layer 101 is located in a portion of the transmissive area
  • the symmetrical triangular wavy fold is larger than the side inclined angle of the symmetrical triangular wavy fold of the portion of the second prism layer 102 located at the reflective region.
  • a side inclined angle of a symmetrical triangular wave-shaped folded surface of the first prism layer 101 at a portion of the transmissive area is denoted by a
  • a side angle of the symmetrical triangular wavy fold of the second prism layer 102 located at a portion of the reflective area Expressed by a2, that is, a>a2.
  • the portion of the preferred second prism layer 102 located in the transmissive region is identical to the portion of the first prism layer 101 located in the transmissive region, that is, the sides of the transversal region of the two prism layers are inclined at the same angle, both For al.
  • a side of the symmetrical triangular wave-shaped fold of the first prism layer 101 in the transmissive region has a side inclination angle a1 ranging from 30° to 60°; the second prism layer 102 is located at the reflective region.
  • the side slant angle a2 of the partial symmetrical triangular wavy fold is in the range of 10. ⁇ 30. .
  • the boundary value is an optional value.
  • a side angle of the symmetrical triangular wave-shaped fold of the first prism layer 101 in the transmissive region is inclined by 42.5°; a symmetric triangle of the second prism layer 102 is located at a portion of the reflective region.
  • the side inclination angle a2 of the wavy fold is 14.5°.
  • the first prism layer 101 can be located at any layer between the blue phase liquid crystal layer 003 and the first polarizer 004. However, in order to minimize the influence of the additional first prism layer on the liquid crystal panel fabrication process, it is preferable to refer to the first prism layer 101 between the first substrate 001 and the first polarizer 004. Similar to the position of the first prism layer 101, the second prism layer 102 may be positioned at any layer between the blue phase liquid crystal layer 003 and the second polarizing plate 005. However, in order to minimize the influence of the added second prism layer on the liquid crystal panel fabrication process, it is preferable to refer to the second prism layer 102 between the second substrate 002 and the second polarizer 005.
  • the materials of the first prism layer 101 and the second prism layer 102 are respectively one of glass, silicon wafer material, polymer material or resin material.
  • the two prism layers use the same material.
  • FIG. 1 is a schematic view showing the structure of a blue phase liquid crystal panel when no voltage is applied.
  • the incident light perpendicular to the substrate passes through the first polarizing plate 004 to become linearly polarized light, which becomes oblique light after passing through the first prism layer 101, and the oblique light passes through the isotropic blue.
  • the liquid crystal layer 003 does not generate an optical path difference.
  • the polarization directions of the first polarizing plate 004 and the second polarizing plate 005 are at an angle of 90 degrees, the emitted light is completely blocked by the second polarizing plate 005; at the same time, in the reflection a region, the incident light perpendicular to the substrate passes through the second polarizing plate 005 to become linearly polarized light, the linearly polarized light is in the first pass After passing through the second prism layer 102, it becomes an oblique light, and the oblique light passes through the isotropic blue phase liquid crystal layer 003 without generating an optical path difference, and again passes through the second prism layer 102 to refract the oblique light.
  • the direction of propagation will be adjusted to the outgoing light perpendicular to the substrate.
  • the polarization direction of the outgoing light changes by 90 degrees due to the reflection, so the emitted light will be completely blocked by the second polarizing plate 005, thereby achieving darkness in the reflective and transmissive areas. State display.
  • FIG. 2 is a schematic view showing the structure of a blue phase liquid crystal panel when a voltage is applied.
  • the incident light perpendicular to the substrate passes through the first polarizing plate 004 to become linearly polarized light, which becomes oblique light after passing through the first prism layer 101; at the same time, in the reflective region, perpendicular to the substrate
  • the incident light passes through the second polarizing plate 005 to become linearly polarized light, which becomes oblique light after passing through the second prism layer 102 for the first time; since the incident light of the vertical substrate passes through the first prism layer 101
  • the portion of the transmissive region has a larger angle of refraction than the portion of the second prism layer 102 located at the reflective region, that is, the light of the transmissive region is at a more oblique angle to the light of the reflective region (more horizontally Entering the blue phase liquid crystal layer 003, therefore, the birefringence Am of the blue phase liquid crystal layer passing through the transmission
  • the propagation distance d 2 of the light passing through the blue phase liquid crystal layer of the reflection region is about twice the propagation distance of the light passing through the blue phase liquid crystal layer of the transmission region, that is, about 4
  • ⁇ ⁇ di A n 2 d 2
  • it is only necessary to adjust the angle of the light entering the blue phase liquid crystal layer in the transmissive region and the reflective region to obtain approximately ⁇ ⁇ 2
  • the degree of ⁇ ⁇ 2 can achieve a transflective display.
  • the portion of the second prism layer 102 disposed in the transmissive region can adjust the oblique light of the transmissive region to the outgoing light perpendicular to the substrate.
  • the transflective blue-phase liquid crystal panel provided by the embodiment of the present invention can generate a uniform vertical electric field under the condition of being energized by the pixel electrode disposed inside the first substrate and the common electrode disposed inside the second substrate, so that Lowering the driving voltage of the blue phase liquid crystal display; and, in order to realize the display of the blue phase liquid crystal panel under a vertical electric field, the present invention adds a first prism layer and/or a second prism layer according to the type of the blue phase liquid crystal panel, so that The light incident on the vertical substrate is deflected, so that the oblique light will generate an optical path when the blue phase liquid crystal layer is driven by the vertical electric field. Poor, thereby controlling the transmittance of light by a change in the vertical electric field strength.
  • the vertical electric field is more uniform, the driving voltage of the blue phase liquid crystal panel is lowered, and the light efficiency can be further improved at the same driving voltage.
  • the single-cassette structure is used in the present invention, so that the fabrication can be simplified. The difficulty of the process.
  • the embodiment further provides a display device, which includes any of the above-mentioned blue phase liquid crystal panels, and the display device may be a product or a component having any display function, such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, or the like. .
  • the prism layers involved in all of the embodiments of the present invention can be fabricated by the following methods. Method 1. Using a mold to make a prism layer.
  • the mold is first formed by wet etching or machining, and the prism layer is formed by casting or transfer molding using the prepared mold.
  • Method 2 The existing hard mold coating technique is used to fabricate the prism layer.
  • a grating roller having a prism-like convex structure is used to apply mechanical pressure to the uncured raw material film to form a prism layer structure under the transfer of the grating roller; and then, after UV or infrared, etc.
  • the series of curing processes form a prism layer.
  • Method 3 Using a soft film forming technique to form a prism layer.
  • the grating roller having a concave structure corresponding to the prism protrusion is firstly dropped into the concave structure by the dripper on the grating roller to form a prism structure in the concave structure of the grating roller, and then rotated.
  • a prism layer is formed by a series of curing processes such as UV or infrared.

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  • Nonlinear Science (AREA)
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Abstract

一种蓝相液晶面板和显示装置，涉及液晶面板的设计和制造领域，用以降低蓝相液晶面板的驱动电压。该蓝相液晶面板包括：位于所述第一基板（001）内侧且阵列形式排列的像素电极（006），位于所述第二基板（002）内侧的公共电极（007），以及位于所述蓝相液晶层（003）与所述第一偏振片（004）之间的第一棱镜层（101），位于所述蓝相液晶层（003）与所述第二偏振片（005）之间的第二棱镜层（102）；每个所述像素电极（006）所在的像素区域分为透射区和反射区；垂直基板的入射光线经过所述第一棱镜层（101）位于所述透射区的部分比经过所述第二棱镜层（101）位于所述反射区的部分的折射角大，以使得所述透射区和反射区的光线通过所述蓝相液晶层（003）所产生的光程差相同。

Description

蓝相液晶面板和显示装置 技术领域
本发明的实施例涉及一种透反式蓝相液晶面板和显示装置。 背景技术
才艮据显示釆用光源类型的不同， 液晶显示装置可以分为透射式、 反射式 和透反式三种。 透反式液晶显示装置兼具透射式和反射式液晶显示装置的优 点， 因此广泛应用于电子产品的显示设备。
为了提升液晶显示器的显示质量， 实现更高的对比度、 更快的响应时间 以及更宽的观看视角， 具有快速应答特性的蓝相液晶材料逐渐受到重视。 蓝 相是一种介于各向同性相与胆<甾相之间的一种液晶相， 其存在的温度范围通 常非常狭窄， 大约只有 rc的温度区间。 但是， 近年来发现经过聚合物稳定 以后的蓝相液晶存在温度范围会大大拓宽， 基本可以满足作为液晶显示材料 的使用温度范围。
蓝相液晶显示器作为最具有潜能的下一代显示器， 具有以下特性。 （1 ) 蓝相液晶显示器具有视野角大， 暗态显示效果好。 （2 )蓝相液晶显示器的理 论响应时间极短， 可达到毫秒级以下。 （3 )蓝相液晶显示器不需要其他的各 种液晶显示器所必须的取向层， 从而降低了制造成本， 简化了制造工艺。
但是， 现有蓝相液晶显示器一般釆用双盒厚（cell gap )的结构， 以保证 透射区和反射区的光程差一致， 并且存在两个很大的技术难题， 即驱动电压 高和光效率低。 发明内容
本发明的实施例提供一种蓝相液晶面板和显示装置， 用以降低透反式蓝 相液晶面板的驱动电压并提高光效率。
本发明的一个方面提供了一种蓝相液晶面板， 包括： 对置的第一基板和 第二基板； 夹置于两基板间的蓝相液晶层； 位于所述第一基板外侧的第一偏 振片， 位于所述第二基板外侧的第二偏振片； 位于所述第一基板内侧且阵列 形式排列的像素电极； 位于所述第二基板内侧的公共电极； 位于所述蓝相液 晶层与所述第一偏振片之间的第一棱镜层； 位于所述蓝相液晶层与所述第二 偏振片之间的第二棱镜层。 每个所述像素电极所在的像素区域分为透射区和 反射区； 垂直基板的入射光线经过所述第一棱镜层位于所述透射区的部分比 经过所述第二棱镜层位于所述反射区的部分的折射角大， 以使得所述透射区 和反射区的光线通过所述蓝相液晶层所产生的光程差相同。
本发明的另一个方面还提供了一种显示装置，其包括上述蓝相液晶面板。 本发明的实施例提供的透反式蓝相液晶面板和显示装置， 通过设置在第 一基板内侧的像素电极和设置在第二基板内侧的公共电极， 在通电的情况下 就能够产生均勾的垂直电场， 这样可以降低蓝相液晶显示器的驱动电压； 为 实现蓝相液晶面板在垂直电场下的显示， 本发明的实施例根据蓝相液晶面板 的类型的不同， 增设第一棱镜层和第二棱镜层， 使得原本垂直基板入射的光 线发生偏折， 这样斜向的光线在经过垂直电场驱动下的蓝相液晶层时， 就会 相应产生光程差， 从而实现通过垂直电场强度的变化控制光线的透过率； 由 于是垂直电场驱动， 故而降低驱动电压并提高光效率； 另外， 由于本发明实 施例中釆用的是单盒厚的结构， 故可简化制作工艺的难度。 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 简单地介绍，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为本发明提供的一种透反式蓝相液晶面板在不加电压时的结构示意 图；
图 2为图 1所示的透反式蓝相液晶面板在施加电压时的结构示意图。 附图标记：
001-第一基板， 002-第二基板， 003-蓝相液晶层， 004-第一偏振片， 005- 第二偏振片， 006-像素电极， 007-公共电极， 008-反射层；
101-第一棱镜层， 102-第二棱镜层。 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， 下面将结合本发 明实施例的附图，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。
现有技术中的蓝相液晶面板是由水平电场驱动的， 这种蓝相液晶面板的 驱动电压比较高。 由于垂直电场（即垂直于基板的电场）的电力线更加均匀， 有利于降低蓝相液晶面板的驱动电压， 故而本发明的实施例提供了一种由垂 直电场驱动的蓝相液晶面板。
除非另作定义， 此处使用的技术术语或者科学术语应当为本发明所属领 域内具有一般技能的人士所理解的通常意义。 本发明专利申请说明书以及权 利要求书中使用的 "第一" "第二" 以及类似的词语并不表示任何顺序、 数 量或者重要性， 而只是用来区分不同的组成部分。 同样， "一个"或者 "一" 等类似词语也不表示数量限制， 而是表示存在至少一个。 "连接" 或者 "相 连" 等类似的词语并非限定于物理的或者机械的连接， 而是可以包括电性的 连接， 不管是直接的还是间接的。
首先， 简要介绍蓝相液晶分子的特性。 在不施加电压时， 蓝相液晶分子 具有各向同性特性； 在施加电压时， 蓝相液晶分子则沿着一个方向具有双折 射特性， 并且蓝相液晶分子沿电场的方向配向。
由于蓝相液晶分子的上述特性， 所以若只是变换驱动电场的类型， 并不 能实现蓝相液晶面板的正常显示功能。 具体的， 在不加电压时， 蓝相液晶分 子呈各向同性态， 这样入射光线经过蓝相液晶层将不会产生光程差， 也就不 改变偏振方向。 在施加电压时， 蓝相液晶分子在垂直电场的作用下， 其长轴 沿该垂直电场的电力线的方向， 这样入射光线经过蓝相液晶层将不会产生光 程差， 同样也不能改变偏振方向。 由于无论是否施加电压， 入射光线的偏振 方向都不会有所改变， 从而就无法通过施加电压的大小控制光线的透过率， 也就无法实现蓝相液晶面板的显示。
为使得蓝相液晶面板在垂直电场的驱动下， 能够正常显示， 本发明的实 施例提供了一种透反式蓝相液晶面板。
如图 1、 2所示， 本发明提供了一种透反式蓝相液晶面板。 该液晶面板包 括： 对置的第一基板 001和第二基板 002, 以及夹置于两基板间的蓝相液晶 层 003 ,位于所述第一基板外侧的第一偏振片 004,位于所述第二基板外侧的 第二偏振片 005。 第一基板 001和第二基板 002之间例如通过柱状或球状隔 垫物保持一定的间距， 并通过封框胶等形成液晶盒（cell )。 第一偏振片 004 和第二偏振片 005的偏转方向彼此垂直。 第一基板 001和第二基板 002例如 为玻璃基板、 石英基板或塑料基板。
该液晶面板还包括： 位于所述第一基板 001内侧且阵列形式排列的像素 电极 006,位于所述第二基板 002内侧的公共电极 007,以及位于所述蓝相液 晶层 003与所述第一偏振片 004之间的第一棱镜层 101 , 位于所述蓝相液晶 层 003与所述第二偏振片 005之间的第二棱镜层 102。
第一基板 001还可以形成有多条栅线和多条数据线（未示出），这些栅线 和数据线彼此交叉以定义多个像素区域， 这些像素区域按矩阵排列。 每个像 素单元包括像素电极和例如薄膜晶体管的开关元件。 例如， 该薄膜晶体管的 栅极与相应的栅线连接， 源极与相应的数据线连接， 漏极与相应的像素区域 的像素电极连接。
每个所述像素电极 006所在的像素区域分为透射区和反射区。 所述第一 棱镜层 101位于所述透射区的部分用于使经所述第一偏振片 004入射的光发 生偏折， 所述第二棱镜层 102位于所述反射区的部分用于使经所述第二偏振 片 005入射的光和出射的光发生偏折。 垂直基板的入射光线经过所述第一棱 镜层 101位于所述透射区的部分比经过所述第二棱镜层 102位于所述反射区 的部分的折射角大， 以使得所述透射区和反射区的光线通过所述蓝相液晶层 003所产生的光程差相同。
由于第一棱镜层 101位于反射区的部分不起作用， 故而第一棱镜层 101 位于反射区的部分可以是任意形状。 当然， 若是第一棱镜层 101只包含位于 透射区的部分也是可以的。
所述第二棱镜层 102可以只存在于反射区。 为使得透射区的出射光线的 传播方向仍垂直于基板， 故而进一步的， 所述第二棱镜层 102位于所述透射 区的部分与所述第一棱镜层 101 位于所述透射区的部分形状一致且相对设 置。 所谓 "相对设置" 是指， 两棱镜层形状相同的一个面均作为各自棱镜层 的内侧， 形状相同的另一个面均作为各自棱镜层的外侧。 示例的， 参考图 1、 2,第一棱镜层 101位于透射区的部分和第二棱镜层 102位于透射区的部分的 形状一致， 均包括平面和折面两个面， 且两者的平面均作为各自棱镜层的外 侧， 两者的折面均作为各自棱镜层的内侧； 当然， 反之也是可以的。 又由于 第一棱镜层 101位于透射区的部分和第二棱镜层 102位于反射区的部分形状 通常不会一致， 故而第二棱镜层 102位于透射区的部分和其位于反射区的部 分的形状也不一致。
所述蓝相液晶层 003包括蓝相液晶分子。 该蓝相液晶可以是聚合物稳定 蓝相液晶、 双液晶基元型蓝相液晶等。
上述第一棱镜层 101和第二棱镜层 102均为能够使光线发生折射的任意 形状的透明层； 优选的， 所述第一棱镜层 101位于所述透射区的部分的两个 面分别为平面和对称三角波状折面； 所述第二棱镜层 102位于所述反射区的 部分的两个面分别为平面和对称三角波状折面。在本发明所有实施例中， "对 称三角波状折面" 为， 横截面为对称三角波且各相邻两侧面的交线相平行的 折面，并且，对称三角波状折面的各个侧面的侧面倾斜角度均相等，所谓 "侧 面倾斜角" 是指侧面与基板平面的夹角。 参考图 1、 2, 第一棱镜层 101位于 所述透射区的部分的对称三角波状折面的侧面倾斜角度均相等， 用 al表示， 第二棱镜层 102位于所述反射区的部分的对称三角波状折面的侧面倾斜角度 均相等， 用 a2表示。 由于优选的， 第二棱镜层 102位于透射区的部分与第一 棱镜层 101位于透射区的部分形状一致， 故而第二棱镜层 102位于透射区的 部分的两个面也分别为平面和对称三角波状折面。
进一步优选的， 第一棱镜层 101的平面为该第一棱镜层 101的外侧， 对 称三角状折面为内侧； 同时第二棱镜层 102 (包括： 位于透射区的部分和位 于反射区的部分） 的平面作为该第二棱镜层 102的外侧， 对称三角波状折面 作为内侧。 这样使得光线在经过第一棱镜层或第二棱镜层， 只在经过对称三 角波状折面时， 改变一次光的传播方向。 当然， 若是第一棱镜层 101的折面 作为该第一棱镜层 101的外侧， 平面作为内侧， 同时第二棱镜层 102的折面 作为该第二棱镜层 102的外侧， 平面作为内侧也是可以的。
进一步的， 垂直基板的入射光线经过所述第一棱镜层 101位于所述透射 区的部分比经过所述第二棱镜层 102位于所述反射区的部分的折射角大的方 式， 在本发明实施例中优选为： 所述第一棱镜层 101位于所述透射区的部分 的对称三角波状折面比所述第二棱镜层 102位于所述反射区的部分的对称三 角波状折面的侧面倾斜角度大。 其中， 第一棱镜层 101位于所述透射区的部 分的对称三角波状折面的侧面倾斜角度用 al表示，第二棱镜层 102位于所述 反射区的部分的对称三角波状折面的侧面倾斜角度用 a2表示， 即 al>a2。 至 于 al应比 a2大多少的问题， 需要以透射区和反射区的光线通过蓝相液晶层 003所产生的光程差相同为目的进行调整。另外， 由于优选的第二棱镜层 102 位于透射区的部分与第一棱镜层 101位于所述透射区的部分形状一致， 也就 是说， 两棱镜层位于透射区的部分的侧面倾斜角度相同， 均为 al。
优选的， 所述第一棱镜层 101位于所述透射区的部分的对称三角波状折 面的侧面倾斜角度 al的范围为 30° -60° ； 所述第二棱镜层 102位于所述反 射区的部分的对称三角波状折面的侧面倾斜角度 a2的范围为 10。 ~30。 。边 界值均是可选用的值。
进一步优选的， 所述第一棱镜层 101位于所述透射区的部分的对称三角 波状折面的侧面倾斜角度 al为 42.5° ；所述第二棱镜层 102位于所述反射区 的部分的对称三角波状折面的侧面倾斜角度 a2为 14.5° 。
从原理上来讲， 第一棱镜层 101可以位于蓝相液晶层 003与第一偏振片 004之间任一层的位置。 但为了尽量减少增置的第一棱镜层对液晶面板制作 工艺的影响， 优选的， 参考图示， 将第一棱镜层 101位于第一基板 001和第 一偏振片 004之间。 与第一棱镜层 101的位置类似， 第二棱镜层 102可以位 于蓝相液晶层 003与第二偏振片 005之间任一层的位置。 但为了尽量减少增 置的第二棱镜层对液晶面板制作工艺的影响， 优选的， 参考图示， 将第二棱 镜层 102位于第二基板 002和第二偏振片 005之间。
上述第一棱镜层 101和所述第二棱镜层 102的材料分别为玻璃、 硅晶片 材料、 高分子材料或树脂材料中的一种，优选的， 两棱镜层使用相同的材料。
图 1为蓝相液晶面板在不加电压时的结构示意图。 在透射区， 垂直于基 板的入射光线经过第一偏振片 004成为线偏振光， 该线偏振光在经过第一棱 镜层 101后成为斜向的光线， 斜向的光线经过各向同性态的蓝相液晶层 003 不会产生光程差，若第一偏振片 004和第二偏振片 005的偏振方向呈 90度夹 角， 出射光线会被第二偏振片 005完全挡住； 与此同时， 在反射区， 垂直于 基板的入射光线经过第二偏振片 005成为线偏振光， 该线偏振光在第一次经 过第二棱镜层 102后成为斜向的光线， 斜向的光线经过各向同性态的蓝相液 晶层 003不会产生光程差， 再次经过第二棱镜层 102的折射， 斜向的光线的 传播方向将调整为垂直于基板的出射光线， 出射光线的偏振方向由于反射的 缘故发生转变 90度的变化，所以出射光线会被第二偏振片 005完全挡住，从 而在反射区和透射区实现暗态的显示。
图 2为蓝相液晶面板在加电压时的结构示意图。 在透射区， 垂直于基板 的入射光线经过第一偏振片 004成为线偏振光， 该线偏振光在经过第一棱镜 层 101后成为斜向的光线； 与此同时， 在反射区， 垂直于基板的入射光线经 过第二偏振片 005成为线偏振光， 该线偏振光在第一次经过第二棱镜层 102 后成为斜向的光线； 由于垂直基板的入射光线经过所述第一棱镜层 101位于 所述透射区的部分比经过所述第二棱镜层 102位于所述反射区的部分的折射 角大， 也就是说， 透射区的光线比反射区的光线以更加倾斜的角度（更趋于 水平）进入蓝相液晶层 003 , 因此， 光线经过透射区蓝相液晶层的双折射率 A m大于光线经过反射区蓝相液晶层的双折射率 Δ η2。 又由于反射区的光线 相当于两次经过蓝相液晶层，故光线经过反射区蓝相液晶层的传播距离 d2约 为光线经过透射区蓝相液晶层的传播距离 的 2倍， 即大概 4=2^; 在本发 明实施例中为使得 Δ ηι di= A n2d2 , 只需通过调整透射区和反射区中光线倾斜 进入蓝相液晶层的角度的大小来得到大概 Δ ηι=2 Δ η2的程度， 就可以达到半 透半反的显示效果。 进一步的， 通过第二棱镜层 102设置在透射区的部分可 以将透射区的斜向光线调整为垂直于基板的出射光线。
需要说明的是， 为清楚地描述本发明所要保护的结构， 故与本发明不相 关的结构在各实施例及附图中做简化或省略处理， 并且在各实施例及附图中 做简化或省略处理的结构都是本领域技术人员在没有作出创造性劳动前提下 容易得到的， 故在本实施例不加赘述。
本发明实施例提供的透反式蓝相液晶面板， 通过设置在第一基板内侧的 像素电极和设置在第二基板内侧的公共电极， 在通电的情况下就能够产生均 匀的垂直电场， 这样可以降低蓝相液晶显示器的驱动电压； 并且， 为实现蓝 相液晶面板在垂直电场下的显示， 本发明根据蓝相液晶面板的类型的不同， 增设第一棱镜层和 /或第二棱镜层 , 使得原本垂直基板入射的光线发生偏折 , 这样斜向的光线在经过垂直电场驱动下的蓝相液晶层时， 就会相应产生光程 差， 从而实现通过垂直电场强度的变化控制光线的透过率。 由于垂直电场更 加均匀， 从而降低了蓝相液晶面板的驱动电压， 进一步的能够在相同的驱动 电压下提高了光效率； 另外， 本发明中釆用的是单盒厚的结构， 故可简化制 作工艺的难度。
本实施例还提供了一种显示装置， 其包括上述任一种蓝相液晶面板， 所述显示装置可以为液晶显示器、 液晶电视、 数码相框、 手机、 平板电脑 等具有任何显示功能的产品或者部件。
本发明所有实施例中所涉及的棱镜层都可以釆用如下方法完成制作。 方法一、 釆用模具制作棱镜层。
例如， 先釆用湿法刻蚀或机械加工等方式制作出模具， 再使用制作好的 模具釆用浇注成型或转印成型的方式制作棱镜层。
方法二、 釆用现有的硬模涂布技术来制作棱镜层。
例如， 首先釆用具有类似棱镜凸起结构的光栅辊对未固化的原料膜材施 加机械的压力， 使其在光栅辊的转印作用下形成棱镜层的结构； 然后， 经过 UV或红外等一系列的固化工艺过程形成棱镜层。
方法三、 釆用软膜成型技术来制作棱镜层。
例如， 釆用具有类似棱镜凸起所对应的凹陷结构的光栅辊， 先由光栅辊 上面的滴头将原料滴到凹陷结构内， 使其在光栅辊的凹陷结构内形成棱镜的 结构， 再转印到相应的基板上。 然后， 经过 UV或红外等一系列的固化工艺 过程形成棱镜层。
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、 一种蓝相液晶面板， 包括：
对置的第一基板和第二基板；
夹置于两基板间的蓝相液晶层；
位于所述第一基板外侧的第一偏振片；
位于所述第二基板外侧的第二偏振片；
位于所述第一基板内侧且阵列形式排列的像素电极；
位于所述第二基板内侧的公共电极；
位于所述蓝相液晶层与所述第一偏振片之间的第一棱镜层；
位于所述蓝相液晶层与所述第二偏振片之间的第二棱镜层；
其中， 每个所述像素电极所在的像素区域分为透射区和反射区； 垂直基 板的入射光线经过所述第一棱镜层位于所述透射区的部分比经过所述第二棱 镜层位于所述反射区的部分的折射角大， 以使得所述透射区和反射区的光线 通过所述蓝相液晶层所产生的光程差相同。
2、根据权利要求 1所述的蓝相液晶面板， 其中， 所述第二棱镜层位于所 述透射区的部分与所述第一棱镜层位于所述透射区的部分形状一致且相对设 置。
3、根据权利要求 2所述的蓝相液晶面板， 其中， 所述第一棱镜层位于所 述透射区的部分的两个面分别为平面和对称三角波状折面；
所述第二棱镜层位于所述反射区的部分的两个面分别为平面和对称三角 波状折面。
4、根据权利要求 3所述的蓝相液晶面板， 其中， 所述垂直基板的入射光 线经过所述第一棱镜层位于所述透射区的部分比经过所述第二棱镜层位于所 述反射区的部分的折射角大包括：
所述第一棱镜层位于所述透射区的部分的对称三角波状折面比所述第二 棱镜层位于所述反射区的部分的对称三角波状折面的侧面倾斜角度大。
5、根据权利要求 4所述的蓝相液晶面板， 其中， 所述第一棱镜层位于所 述透射区的部分的对称三角波状折面的侧面倾斜角度的范围为 30° ~60。 ； 所述第二棱镜层位于所述反射区的部分的对称三角波状折面的侧面倾斜 角度的范围为 10° ~30° 。
6、根据权利要求 5所述的蓝相液晶面板， 其中， 所述第一棱镜层位于所 述透射区的部分的对称三角波状折面的侧面倾斜角度为 42.5° ；
所述第二棱镜层位于所述反射区的部分的对称三角波状折面的侧面倾斜 角度为 14.5° 。
7、 根据权利要求 3-6任一项所述的蓝相液晶面板， 其中， 所述第一棱镜 层的平面为外侧， 对称三角波状折面为内侧；
所述第二棱镜层的平面为外侧， 对称三角波状折面为内侧。
8、 根据权利要求 1-7任一项所述的蓝相液晶面板， 其中， 所述第一棱镜 层位于所述第一基板和所述第一偏振片之间；
所述第二棱镜层位于所述第二基板和所述第二偏振片之间。
9、 根据权利要求 1-8任一项所述的蓝相液晶面板， 其中， 所述第一棱镜 层和所述第二棱镜层的材料分别为玻璃、 硅晶片材料、 高分子材料或树脂材 料。
10、 一种显示装置， 包括权利要求 1-9任一项所述的蓝相液晶面板。
PCT/CN2012/083098 2012-05-11 2012-10-17 蓝相液晶面板和显示装置 Ceased WO2013166807A1 (zh)

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