WO2012167511A1 - 像素电极结构 - Google Patents

像素电极结构 Download PDF

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Publication number
WO2012167511A1
WO2012167511A1 PCT/CN2011/079091 CN2011079091W WO2012167511A1 WO 2012167511 A1 WO2012167511 A1 WO 2012167511A1 CN 2011079091 W CN2011079091 W CN 2011079091W WO 2012167511 A1 WO2012167511 A1 WO 2012167511A1
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WIPO (PCT)
Prior art keywords
trunk
pixel electrode
electrode structure
vertical
horizontal
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PCT/CN2011/079091
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English (en)
French (fr)
Inventor
张鑫
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Shanghai Tianma Microelectronics Co Ltd
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Shanghai Tianma Microelectronics Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd, Shanghai Tianma Microelectronics Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to DE112011105334.7T priority Critical patent/DE112011105334B4/de
Publication of WO2012167511A1 publication Critical patent/WO2012167511A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G02F1/133757—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different alignment orientations
    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134336—Matrix
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/40—Arrangements for improving the aperture ratio

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a pixel electrode structure of a liquid crystal display. Background technique
  • a liquid crystal display is one of the most widely used flat panel displays, and the LCD includes a pair of panels provided with field generating electrodes such as pixel electrodes and common electrodes, and a liquid crystal (LC) layer disposed between the two panels.
  • field generating electrodes such as pixel electrodes and common electrodes
  • LC liquid crystal
  • the LCD displays an image when the polarization of light incident on the liquid crystal layer is adjusted.
  • PSVA Polymer Stabilized Vertical Alignment
  • Figure 1 shows a schematic design of a pixel electrode commonly used in a general VA mode liquid crystal display.
  • the pixel electrode of the conventional VA mode LCD is designed as a "meter" type, including a strip-shaped vertical trunk, a strip-shaped horizontal trunk, and strips respectively at an angle to the horizontal trunk. Slit, usually, strips and horizontal trunks The angle between the two is ⁇ 45 degrees, ⁇ 135 degrees. Each strip is located on the same plane as the vertical trunk and the horizontal trunk.
  • the vertical trunk and the horizontal trunk center intersect perpendicularly, and the so-called center perpendicularly intersects, that is, the vertical trunk and the horizontal trunk are perpendicular to each other, and the region near the center of the vertical intersection is the central region of the unit pixel electrode, and the vertical trunk and The horizontal trunk divides the entire pixel (pixel) area into four regions (domains), each of which is composed of strips that are angled at an angle to the vertical trunk or horizontal trunk.
  • the electrode design of the "meter" shape which is mirror-symmetrical to the upper and lower sides and the left and right sides as shown in Fig. 1 is thus formed.
  • Fig. 2 is a view showing liquid crystal tilting after a voltage (approx. 0 to 4 V, an arrow indicates an applied voltage) is applied to the pixel electrode structure shown in Fig. 1.
  • the liquid crystal is reversed from the outside of the pixel electrode and gradually tilts inside the pixel electrode, and the angle of the dump is in the branch direction, 4
  • the liquid crystal tilting direction in the upper right area is 45 degrees
  • the liquid crystal tilting direction in the upper left area is 135 degrees
  • the liquid crystal tilting direction in the lower left area is 225 degrees
  • the liquid crystal tilting direction in the lower right area is 315 degrees
  • the liquid crystal in each area is dumped.
  • the directions are all directed to the central area of the pixel electrode.
  • the pixel electrode structure disclosed in the prior art is symmetrically designed in the middle region, and for the unit pixel electrode, since the liquid crystal tilting direction is directed to the central region of the pixel electrode, it is sure to appear on the trunk.
  • a spiral liquid crystal rotation area a specific simulation diagram is shown in FIG. 3, and FIG. 3 is a schematic view showing a vortex formed by liquid crystal tilting of the pixel electrode structure at the center.
  • Fig. 4 is a schematic view of the pixel electrode structure corresponding to Fig. 3 under a microscope. Wherein F indicates the position of the swirling liquid crystal rotation region formed by the liquid crystal tilting.
  • FIG. 5 is a schematic diagram showing the vortex shift of the liquid crystal tilt of the pixel electrode structure. Because of this, once the pixel electrode is energized to drive the liquid crystal deflection, if the swirling liquid crystal rotation region F appears on the edge of the trunk, it will be in the swirling liquid crystal rotation region. The black line shown in the non-uniform display is shown around F. For details, refer to the schematic diagram of Figure 6 under the microscope.
  • Figure 6 is a schematic diagram of the pixel electrode structure corresponding to Figure 5 under the microscope.
  • the sawtooth shape next to the liquid crystal rotation region F is black, and in the prior art shown in FIG. 6, the "black grain" phenomenon generated by the swirling liquid crystal rotation region is the upper and lower display regions appearing on the unit pixel electrode side.
  • the edge display position is such that the original display area is changed to the opaque area, resulting in a decrease in the transmittance and an unsatisfactory image display quality effect.
  • the invention provides a pixel electrode structure, which can effectively solve the prior art technology that the vortex formed by the liquid crystal is deviated from the center position due to the absolute symmetry of the pixel electrode structure, thereby reducing the bright area in the display area and reducing the transmittance. problem.
  • the pixel electrode structure provided by the present invention comprises: a strip-shaped horizontal trunk and a strip-shaped vertical trunk, the horizontal trunk intersecting the center of the vertical trunk vertically;
  • Two centrally symmetrical slits are also provided in the central region where the horizontal trunk intersects the vertical trunk vertically.
  • the shape of the two centrally symmetric slits is a polygon or a fan shape.
  • the horizontal region of the horizontal trunk perpendicularly intersecting the vertical trunk has a length in the horizontal direction c ⁇ lx; X is the length of the horizontal trunk; the horizontal trunk and the vertical
  • the length of the central region of the straight trunk perpendicularly intersecting in the vertical direction y ⁇ ⁇ is the length of the vertical trunk.
  • the horizontal trunk intersects the vertical trunk center vertically Among the four sub-regions, the upper left area and the upper right area are mirror-symmetrical; the lower left area and the lower right area are mirror-symmetrical; the upper left area and the lower left area are mirror-symmetrical; the upper right area and the lower right area are mirror-symmetrical.
  • the pixel electrode structure has a "m" shape as a whole, and the angle between the plurality of strip branches and the vertical stem and the horizontal stem is 45 degrees.
  • the plurality of slits of the plurality of strip-shaped branches are the same width.
  • the plurality of slits of the plurality of strip-shaped branches are different in width.
  • the plurality of strip branches have the same width.
  • the plurality of strip branches have different widths.
  • the mode of the liquid crystal display panel to which the pixel electrode structure is applied is a polymer stabilized vertical alignment mode or a pattern vertical alignment mode.
  • the pixel electrode structure in the present application is specially designed. Specifically, two central symmetrical slits are provided in a central region where the vertical trunk and the horizontal trunk center intersect perpendicularly, thereby breaking the pixel electrode structure in the prior design.
  • the pixel electrode structure as a whole is centrally symmetric, but is asymmetrical to the left and right, which is advantageous for guiding the liquid crystal to form a swirling liquid crystal rotation region at a slit position provided in a central region of the pixel electrode structure, since the slit is centrally symmetrical, Therefore, the position of the swirling liquid crystal rotation region can be well fixed, that is, the swirling liquid crystal rotation region is fixed at the center position, thereby avoiding a decrease in the bright area of the display area and a decrease in the transmittance when the image is displayed.
  • the liquid crystal display panel to which the pixel electrode structure of the present invention is applied has a large bright area, a high transmittance, and a good display effect.
  • FIG. 1 is a schematic view showing the design of a pixel electrode commonly used in a general VA mode liquid crystal display
  • FIG. 2 is a view showing a liquid crystal reversed after a voltage is applied to the pixel electrode structure shown in FIG. Schematic diagram
  • Figure 3 is a schematic view showing the vortex formed by the liquid crystal tilting of the pixel electrode structure appearing at the center;
  • FIG. 4 is a schematic view of a pixel electrode structure corresponding to FIG. 3 under a microscope;
  • FIG. 5 is a schematic view showing a vortex shift formed by liquid crystal tilting of a pixel electrode structure;
  • FIG. 6 is a pixel electrode structure corresponding to FIG. 7 is a schematic structural view of a first embodiment of a pixel electrode structure of the present invention;
  • FIG. 8 is a schematic structural view of a second embodiment of a pixel electrode structure of the present invention;
  • FIG. 9 is a third embodiment of a pixel electrode structure of the present invention. Schematic. detailed description
  • the invention provides a novel pixel electrode structure for the existing pixel electrode structure and the liquid crystal display array substrate, which has low transmittance and unsatisfactory display effect, and can effectively overcome the defect.
  • the present invention is based on the improvement of the pixel structure of the existing "m"-shaped structure, the core of which is to break the absolute symmetry of the existing pixel electrode structure, the vertical stem and level of the pixel electrode structure.
  • the central region where the trunk intersects is provided with two slits which are centrally symmetrical.
  • the so-called central symmetry means that one of the polygons or the fan shape can be rotated 180 degrees around a center point to overlap with another polygon.
  • the liquid crystal is given a certain direction of direction, that is, offset at the two centrally symmetric slit positions, due to the two The slit is centrally symmetrical, so that the liquid crystal forms a swirling liquid crystal rotation region here, thereby fixing the position of the swirling liquid crystal rotation region to the central region, avoiding the shift to other places and causing the transmittance of the pixel electrode structure to decrease.
  • FIG. 7 is a schematic structural diagram of a first embodiment of a pixel electrode structure according to the present invention.
  • the pixel electrode structure in this embodiment includes:
  • a strip-shaped horizontal trunk 1 and a strip-shaped vertical trunk 2 the horizontal trunk 1 intersecting the center of the vertical trunk 2 vertically;
  • a plurality of strip branches 3 each having a certain angle.
  • the plurality of strip branches 3 are at an angle of 45 degrees to both the horizontal trunk 1 and the vertical trunk 2, although other angles are also possible, for example, in the B region.
  • the strip 3 is at an angle of 30 degrees to the horizontal trunk 1, and in the A region, the strip 3 is at an angle of 150 degrees to the horizontal trunk 1, as long as the strips 3 in the middle of the A and B regions, and the C region and the D region Keep symmetry.
  • the plurality of strip branches 3 are outwardly diverged with respect to a center point 0 where the vertical trunk 2 and the horizontal trunk 1 intersect perpendicularly, and the plurality of strip branches 3 are spaced apart by a plurality of slits 4.
  • the horizontal trunk 1 is perpendicular to the center of the vertical trunk 2 (the E region in the dotted line in Fig. 8) is also provided with two centrally symmetrical slits;
  • two centrally symmetrical slits are provided on the horizontal trunk 1, and the shape of the slits may be a polygon or a fan shape, and the polygonal slits shown in Fig. 7 are a quadrangular slit 5 and a quadrilateral slit 6, respectively.
  • the A and B regions are mirror-symmetrical; the C and D regions are mirror-symmetrical; Symmetrical with the C area; B and D areas are mirror symmetrical.
  • Fig. 7 is an embodiment in which a centrally symmetrical quadrilateral slit is provided in the central region E.
  • the same technical effect can be achieved by providing a triangular slit or a parallelogram or a sectoral slit. See Fig. 8 for details.
  • Figure 8 is a schematic view showing the structure of a second embodiment of the pixel electrode structure of the present invention.
  • the pixel electrode structure in this embodiment includes:
  • Each has a plurality of strip branches at an angle to the horizontal trunk and the vertical trunk, and the plurality of strip branches are outwardly diverged with respect to a center point at which the vertical trunk intersects the horizontal trunk vertically, and the plurality of strip branches are spaced apart from each other. A gap.
  • the central trunk intersects the center of the vertical trunk vertically (the E region within the dashed line in Fig. 8) is also provided with two centrally symmetrical slits;
  • the present embodiment is two center-symmetrical parallelogram slits provided on the horizontal trunk, which are a parallelogram slit 5 and a parallelogram slit 6, respectively.
  • the polygon provided by the present invention includes a triangle, a quadrangle, a pentagon or a fan, etc., as long as the polygon or the fan-shaped slit can play the role of guiding the liquid crystal to the central region, which is within the protection scope of the present invention, and details are not described herein again. .
  • the central region E where the horizontal trunk intersects the vertical trunk vertically has a length in the horizontal direction of the square ⁇ ⁇ ⁇ ; X is the length of the horizontal trunk; the central region E is in the vertical direction
  • the length of the upward y ⁇ ; ⁇ is the length of the vertical trunk.
  • the liquid crystal guiding action can be performed, so that the liquid crystal forms a swirling liquid crystal rotation region in the central region.
  • the polygonal slit provided in the central region E as exemplified in the above embodiment is a polygonal slit provided on the horizontal trunk.
  • the present invention can also provide two polygonal slits with central symmetry on the vertical trunk as long as it satisfies the principle of central symmetry. And the left and right asymmetry of the pixel electrode structure can also achieve the object and effect of the present invention.
  • Figure 9 is a schematic view showing the structure of a third embodiment of the pixel electrode structure of the present invention.
  • the four regions which are equally divided by the vertical intersection of the horizontal trunk and the vertical trunk center respectively have a plurality of strip branches at an angle to the horizontal trunk and the vertical trunk, respectively.
  • the plurality of strip branches diverge outwardly with respect to a center point at which the vertical trunk intersects the horizontal trunk vertically, and the plurality of strip branches are spaced apart by a plurality of slits.
  • the center of the horizontal trunk intersecting the vertical trunk center vertically (such as the E region in the dotted line in FIG. 9) is also provided with two centrally symmetrical slits;
  • the two central symmetrical slits provided in this embodiment are specifically provided with two centrally symmetric quadrilaterals 5 and 6 on the vertical trunk.
  • the pixel electrode of the present invention can be applied to a Polymer Stabilization Vertical-Alignment (PSVA) liquid crystal display panel, or a Pattern Vertical Alignment (PVA) liquid crystal display panel, and the like.
  • PSVA Polymer Stabilization Vertical-Alignment
  • PVA Pattern Vertical Alignment
  • the material of the pixel electrode in the pixel electrode structure is indium tin oxide or indium zinc oxide or amorphous indium tin oxide.
  • the pixel electrode structure in the present application is specially designed. Specifically, two central symmetrical slits are provided in a central region perpendicularly intersecting the vertical trunk and the horizontal trunk center, and the shape of the slit may be a polygon or a fan shape, thereby breaking
  • the absolute symmetry of the pixel electrode structure in the existing design makes the pixel electrode structure have a central symmetry as a whole, but is asymmetrical to the left and right, which is advantageous for guiding the liquid crystal to form a vortex at a polygonal or fan-shaped slit position in the central region of the pixel electrode structure.
  • the position where the swirling liquid crystal rotation region is formed can be fixed, that is, the vortex is fixed at the center position, thereby avoiding the brightening of the display area when the image is displayed.
  • the area is reduced and the penetration rate is reduced.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

一种像素电极结构，包括：条状的水平主干（1）和条状的竖直主干（2），所述水平主干（1）与所述竖直主干（2）的中心垂直相交；由所述水平主干（1）与所述竖直主干（2）中心垂直相交所均分而成的四个区域（A，B，C，D）中，分别具有多个条状分支（3），所述多个条状分支（3）相对于竖直主干（2）与水平主干（1）垂直相交的中心点（O）向外发散，所述多个条状分支（3）间隔有多条缝隙（4）；所述水平主干（1）与竖直主干（2）中心垂直相交的中心区域（E）内还设置有两个中心对称的多边形或扇形切口。应用该像素电极结构的液晶显示面板的亮区较大，穿透率较高，显示效果好。

Description

像素电极结构 本申请要求于 2011 年 6 月 7 日提交中国专利局、 申请号为 201110150608.9、 发明名称为 "像素电极结构" 的中国专利申请的优 先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及一种液晶显示技术领域，尤其涉及一种液晶显示器的 像素电极结构。 背景技术
液晶显示器 (LCD)是最广泛使用的平板显示器之一， LCD包括设 置有场发生电极诸如像素电极和公共电极的一对面板以及设置在两 个面板之间的液晶 (LC)层。 当电压被施加到场发生电极从而在 LC层 中产生电场， 该电场决定了液晶层中的 LC分子的取向， 因此而调整 入射到液晶层的光的偏振时， LCD显示图像。
目前业界发展出一种称为高分子安定化垂直配向（Polymer Stabilized Vertical Alignment, PSVA)的技术，该技术是在液晶材料中掺 入适当浓度的单体化合物 (monomer)并且震荡均勾。 接着， 将混合后 的液晶材料置于加热器上加温到达等向性 (Isotropy)状态。当液晶混合 物降至室温时， 液晶混合物会回到向列型 (nematic)状态。 然后， 将液 晶混合物注入至液晶盒并施与电压。当施加电压使液晶分子排列稳定 物层， 由此达到稳定配向的目的。
图 1所示的是一般 VA模式液晶显示器常用的像素电极的设计示 意图。
如图 1所示通常的 VA模式 LCD的像素电极设计为 "米" 字型， 包含条状的竖直主干（main trunk )、 条状的水平主干、 以及分别与水 平主干呈一定夹角的条状分支（slit ), 通常， 条状分支与水平主干之 间的角度为 ± 45度， ± 135度。各条状分支与竖直主干和水平主干位 于同一平面上。 其中竖直主干和水平主干中心垂直相交， 所谓的中心 垂直相交， 即指竖直主干和水平主干相互垂直， 垂直相交的中心附近 的区域即为该单位像素电极的中心区域，该竖直主干和水平主干将整 个像素 （pixel ) 面积平均分成 4个区域（domain ), 每个区域都由与 竖直主干或水平主干呈一定角度的条状分支（slit ) 平铺组成。 如此 形成图 1所示的关于上下和左右分别镜像对称的 "米"字型的电极设 计。
图 2是显示在图 1所示像素电极结构上施加电压（大约为 0~4V, 箭头表示有施加电压）后的液晶倾倒的示意图。
如图 2所示， 通常所采用的 "米"字型的电极结构在通电的情况 下， 液晶的倒向是由像素电极外侧开始逐渐像素电极内侧倾倒， 倾倒 的角度是沿分支方向， 4 个区域中， 右上区域的液晶倾倒方向为 45 度； 左上区域的液晶倾倒方向为 135度； 左下区域的液晶倾倒方向为 225度； 右下区域的液晶倾倒方向为 315度， 各个区域中的液晶倾倒 方向都指向像素电极的中心区域。
为了提升面板穿透率，现有技术揭示的像素电极结构在中间区域 是对称设计的， 而对于单位像素电极而言， 由于液晶倾倒方向都指向 像素电极的中心区域，在主干上是一定会出现一个漩涡状液晶旋转区 域， 具体模拟图如图 3所示， 图 3是像素电极结构的液晶倾倒形成的 漩涡出现在中心的示意图。图 4是与图 3对应的像素电极结构在显微 镜下的示意图。 其中， F指示的是液晶倾倒形成的漩涡状液晶旋转区 域的位置。
然而，由于液晶倾倒而出现的漩涡状旋转区域的位置出现在主干 中间区域或者出现在主干上稍边缘区域的几率大致是相同的，也即有 时候漩涡状的旋转区域会出现在主干上稍边缘的区域，具体模拟图如 图 5所示，图 5是像素电极结构的液晶倾倒形成的漩涡出现偏移的示 意图。 正因为如此， 一旦像素电极通电驱动液晶偏转时， 若漩涡状液 晶旋转区域 F出现在主干上稍边缘区域，则会在漩涡状液晶旋转区域 F 的周围出现所示非均匀显示的 "黑纹，，， 具体参见在显敖镜下的示 意图图 6, 图 6是与图 5对应的像素电极结构在显微镜下的示意图。 图 6中漩涡状液晶旋转区域 F旁边锯齿状的即为黑纹，与图 6所示的 现有技术中， 漩涡状液晶旋转区所产生的 "黑纹"现象是出现在单位 像素电极一侧的上下两显示区域的边缘显示位置处，使得原本的显示 区域转变为不透光区域，从而导致穿透率下降， 图像显示质量效果不 理想。 发明内容
本发明提供一种像素电极结构，可以有效的解决现有技术中因像 素电极结构绝对对称导致的液晶形成的漩涡会偏离中心位置，从而使 得显示区域中的亮区减少， 穿透率下降的技术问题。
为了解决上述技术问题， 本发明提供的像素电极结构， 包括： 条状的水平主干和条状的竖直主干，所述水平主干与所述竖直主 干的中心垂直相交；
由所述水平主干与所述竖直主干中心垂直相交所均分而成的四 个区域中， 分别具有多个条状分支， 所述多个条状分支相对于竖直主 干与水平主干垂直相交的中心点向外发散，所述多个条状分支间隔有 多条缝隙；
所述水平主干与竖直主干垂直相交的中心区域内还设置有两个 中心对称的切口。
优选的， 所述两个中心对称的切口的形状为多边形或扇形。 优选的， 所述水平主干与竖直主干垂直相交的中心区域在水平 方向上的长度 c≤lx ; X为所述水平主干的长度； 所述水平主干与竖
2 直主干垂直相交的中心区域在竖直方向上的长度 y≤ ; Γ为所述竖 直主干的长度。 优选的，所述由所述水平主干与所述竖直主干中心垂直相交所均 分而成的四个区域中， 左上区域和右上区域镜像对称； 左下区域和右 下区域镜像对称； 左上区域和左下区域镜像对称； 右上区域和右下区 域镜像对称。
优选的， 所述像素电极结构整体呈 "米" 字型， 所述多个条状分 支与所述垂直主干与所述水平主干之间的夹角为 45度。
优选的， 所述多个条状分支间隔的多条缝隙的宽度相同。
优选的， 所述多个条状分支间隔的多条缝隙的宽度不同。
优选的， 所述多个条状分支的宽度相同。
优选的， 所述多个条状分支的宽度不同。
优选的，所述像素电极结构应用的液晶显示面板的模式为高分子 安定化垂直配向模式或图案垂直排列模式。
实施本发明的实施例， 具有如下有益效果：
本申请中的像素电极结构是经过特殊设计的， 具体的， 通过在竖 直主干与水平主干中心垂直相交的中心区域设置两个中心对称的切 口， 从而打破了现有设计中的像素电极结构的绝对对称，使得像素电 极结构整体呈现中心对称，但左右并不对称， 这有利于导引液晶在像 素电极结构中心区域中设置的切口位置形成漩涡状液晶旋转区域，由 于该切口是中心对称的，因此能很好的固定该漩涡状液晶旋转区域的 位置， 也即将漩涡状液晶旋转区域固定在正中心的位置，从而避免在 显示图像的时候， 显示区域的亮区减少， 穿透率下降。 应用本发明的 像素电极结构的液晶显示面板的亮区较大，穿透率较高，显示效果好。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面 将对实施例或现有技术描述中所需要使用的附图作筒单地介绍，显而 易见地， 下面描述中的附图仅仅是本发明的一些实施例，对于本领域 普通技术人员来讲， 在不付出创造性劳动性的前提下，还可以根据这 些附图获得其他的附图。
图 1是一般 VA模式液晶显示器常用的像素电极的设计示意图； 图 2是显示在图 1所示的像素电极结构上施加电压后的液晶倒向 示意图；
图 3 是像素电极结构的液晶倾倒形成的漩涡出现在中心的示意 图；
图 4是与图 3对应的像素电极结构在显微镜下的示意图； 图 5是像素电极结构的液晶倾倒形成的漩涡出现偏移的示意图； 图 6是与图 5对应的像素电极结构在显微镜下的示意图； 图 7是本发明像素电极结构的第一实施例的结构示意图； 图 8是本发明像素电极结构的第二实施例的结构示意图； 图 9是本发明像素电极结构的第三实施例的结构示意图。 具体实施方式
本发明针对现有的像素电极结构和液晶显示阵列基板中存在的 穿透率低，显示效果不理想的缺陷，提供了一种新型的像素电极结构， 可以有效的克服该缺陷。
首先说明的是， 本发明是基于现有的 "米"字形结构的像素电极 结构所作的改进， 其核心是打破现有的像素电极结构的绝对对称性， 在像素电极结构的竖直主干和水平主干相交的中心区域设置两个切 口， 该切口是中心对称的。 所谓的中心对称， 是指其中的一个多边形 或者扇形围绕一个中心点旋转 180度后可以与另一个多边形重叠。如 此一来，由于在竖直主干和水平主干中心垂直相交的中心区域设置了 两个切口， 给予液晶倒向一定的方向指引， 也即在两个中心对称的切 口位置处偏移， 由于两个切口是中心对称的， 所以液晶会在此处形成 漩涡状液晶旋转区域，从而将漩涡状液晶旋转区域的位置固定在中心 区域， 避免其偏移到别处而导致像素电极结构的穿透率降低。
下面将结合附图详细本发明实施例的实现过程。
参见图 7, 为本发明像素电极结构的第一实施例的结构示意图； 本实施例中的像素电极结构， 包括：
条状的水平主干 1和条状的竖直主干 2, 水平主干 1与竖直主干 2的中心垂直相交； 由水平主干 1与竖直主干 2中心垂直相交所均分而成的四个区域 中 （如图所示的 A、 B、 C、 D四个区域）， 分别具有与水平主干 1和 竖直主干 2均呈一定角度的多个条状分支 3, 优选的， 多个条状分支 3与水平主干 1和竖直主干 2都呈 45度角， 当然其他角度也是可行 的， 例如在 B区域内， 条状分支 3与水平主干 1呈 30度角， 则在 A 区域内， 条状分支 3与水平主干 1呈 150度角， 只要 A区域和 B区 域， C区域和 D区域中间的条状分支 3保持对称即可。所述多个条状 分支 3相对于竖直主干 2与水平主干 1垂直相交的中心点 0向外发 散， 多个条状分支 3间隔有多条缝隙 4。
水平主干 1与竖直主干 2中心垂直相交的中心区域内（如图 8中 虚线范围内的 E区域）还设置有两个中心对称的切口；
需要说明的是，本实施例是在水平主干 1上设置两个中心对称的 切口， 该切口的形状可以是多边形或者扇形， 图 7中所示的多边形切 口分别是四边形切口 5和四边形切口 6。
应用如图 7所示的像素电极结构后，漩涡状液晶旋转区域形成于 像素电极结构的中心区域 E, 此时液晶倒向的模拟图如图 3所示， 因 此实际的液晶显示在显微镜下的效果如图 4所示， 即亮区比较大， 穿 透效果好， 显示效果好。
需要说明的是，由水平主干 1与竖直主干 2中心垂直相交所均分 而成的四个区域 A、 B、 C、 D中， A和 B区域镜像对称； C和 D区 域镜像对称； A和 C区域镜像对称； B和 D区域镜像对称。
图 7是在中心区域 E中设置中心对称的四边形切口的实施例，设 置三角形切口或者平行四边形或者扇形切口也可以达到同样的技术 效果， 具体参见图 8。
图 8是本发明的像素电极结构的第二实施例的结构示意图。 本实施例中的像素电极结构， 包括：
条状的水平主干和条状的竖直主干，水平主干与竖直主干的中心 垂直相交；
由水平主干与竖直主干中心垂直相交所均分而成的四个区域中， 分别具有与水平主干和竖直主干均呈一定角度的多个条状分支，多个 条状分支相对于竖直主干与水平主干垂直相交的中心点向外发散，多 个条状分支间隔有多条缝隙。
水平主干与竖直主干中心垂直相交的中心区域内（如图 8中虚线 范围内的 E区域）还设置有两个中心对称的切口；
需要说明的是，本实施例是在水平主干上设置的两个中心对称的 平行四边形切口， 分别是平行四边形切口 5和平行四边形切口 6。
本发明提供的多边形包括三角形，四边形，五边形或者扇形等等， 只要该多边形或者扇形切口能起到引导液晶倒向中心区域的作用都 在本发明的保护范围之列， 在此不再赘述。
需要说明的是，水平主干与竖直主干垂直相交的中心区域 E在水 平方向上的长度 ^≤丄 ； X为水平主干的长度； 中心区域 E在竖直方
2 向上的长度 y≤ ; Γ为竖直主干的长度。 只要是在中心区域 E内设置的两个中心对称的多边形，都可以起 到液晶导向作用，使得液晶在中心区域形成漩涡状液晶旋转区域。 当 然，越是靠近水平主干和竖直主干中心垂直相交的中心点设置中心对 称的多边形， 液晶形成的漩涡状液晶旋转区域就越靠近中心点。
上述实施例中所列举的在中心区域 E 中设置多边形切口是在水 平主干上设置的多边形切口，本发明还可以在竖直主干上设置中心对 称的两个多边形切口， 只要其满足中心对称的原则， 并且使得像素电 极结构的左右不对称， 也能达到本发明的目的和效果。
图 9是本发明像素电极结构的第三实施例的结构示意图。
本实施例中的像素电极结构， 包括：
条状的水平主干和条状的竖直主干，水平主干与竖直主干的中心 垂直相交；
由水平主干与竖直主干中心垂直相交所均分而成的四个区域中， 分别具有与水平主干和竖直主干均呈一定角度的多个条状分支，所述 多个条状分支相对于竖直主干与水平主干垂直相交的中心点向外发 散， 多个条状分支间隔有多条缝隙。 水平主干与竖直主干中心垂直相 交的中心区域内（如图 9中虚线范围内的 E区域）还设置有两个中心 对称的切口；
需要说明的是， 本实施例中设置的两个中心对称切口， 具体是在 竖直主干上设置两个中心对称的四边形 5和 6。
需要说明的是，本发明的像素电极可应用于高分子安定化垂直配 向模式 ( Polymer Stabilization Vertical- Alignment, PSVA )液晶显示面 板、 或是图案垂直排列（Pattern Vertical Alignment, PVA) 液晶显示面 板等等。像素电极结构中的像素电极的材料为氧化铟锡或氧化铟锌或 非晶氧化铟锡。
本申请中的像素电极结构是经过特殊设计的， 具体的， 通过在竖 直主干与水平主干中心垂直相交的中心区域设置两个中心对称的切 口， 该切口的形状可以是多边形或者扇形，从而打破了现有设计中的 像素电极结构的绝对对称，使得像素电极结构整体呈现中心对称，但 左右并不对称，这有利于导引液晶在像素电极结构中心区域中设置的 多边形或者扇形切口位置形成漩涡状液晶旋转区域，由于该切口是中 心对称的， 因此能艮好的固定漩涡状液晶旋转区域形成的位置， 也即 将漩涡固定在正中心的位置，从而避免在显示图像的时候， 显示区域 的亮区减少， 穿透率下降。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域 的普通技术人员来说， 在不脱离本发明原理的前提下，还可以做出若 干改进和润饰， 这些改进和润饰也视为本发明的保护范围。

Claims

权 利 要 求
1、 一种像素电极结构， 其特征在于， 包括：
条状的水平主干和条状的竖直主干，所述水平主干与所述竖直主 干的中心垂直相交；
由所述水平主干与所述竖直主干中心垂直相交所均分而成的四 个区域中， 分别具有多个条状分支， 所述多个条状分支相对于竖直主 干与水平主干垂直相交的中心点向外发散，所述多个条状分支间隔有 多条缝隙；
所述水平主干与竖直主干中心垂直相交的中心区域内还设置有 两个中心对称的切口。
2、 如权利要求 1所述的像素电极结构， 其特征在于， 所述两个 中心对称的切口的形状为多边形或扇形。
3、 如权利要求 2所述的像素电极结构， 其特征在于， 所述水平 主干与竖直主干垂直相交的中心区域在水平方向上的长度 c≤丄 ί ; X
2 为所述水平主干的长度；所述水平主干与竖直主干垂直相交的中心区 域在竖直方向上的长度}^≤ ； Γ为所述竖直主干的长度。
4、 如权利要求 2所述的像素电极结构， 其特征在于， 所述由所 述水平主干与所述竖直主干中心垂直相交所均分而成的四个区域中， 左上区域和右上区域镜像对称； 左下区域和右下区域镜像对称； 左上 区域和左下区域镜像对称； 右上区域和右下区域镜像对称。
5、 如权利要求 4所述的像素电极结构， 其特征在于， 所述像素 电极结构整体呈 "米"字型， 所述多个条状分支与所述垂直主干与所 述水平主干之间的夹角为 45度。
6、 如权利要求 5所述的像素电极结构， 其特征在于， 所述多个 条状分支间隔的多条缝隙的宽度相同。
7、 如权利要求 5所述的像素电极结构， 其特征在于， 所述多个 条状分支间隔的多条缝隙的宽度不同。
8、 如权利要求 6或 7所述的像素电极结构， 其特征在于， 所述 多个条状分支的宽度相同。
9、 如权利要求 6或 7所述的像素电极结构， 其特征在于， 所述 多个条状分支的宽度不同。
10、 如权利要求 6或 7所述的像素电极结构， 其特征在于， 所述 像素电极结构应用的液晶显示面板的模式为高分子安定化垂直配向 模式或图案垂直排列模式。
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