JP5426823B2 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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JP5426823B2
JP5426823B2 JP2007288657A JP2007288657A JP5426823B2 JP 5426823 B2 JP5426823 B2 JP 5426823B2 JP 2007288657 A JP2007288657 A JP 2007288657A JP 2007288657 A JP2007288657 A JP 2007288657A JP 5426823 B2 JP5426823 B2 JP 5426823B2
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liquid crystal
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electrode
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electric field
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伸一 木村
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エルジー ディスプレイ カンパニー リミテッド
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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
    • G02F1/1343—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
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black 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
    • 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
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

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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)
  • Geometry (AREA)

Description

この発明は、表示面の焼きつきを改善する液晶表示装置に関するものである。   The present invention relates to a liquid crystal display device that improves image burn-in.

液晶に電界を印加するための一対の電極を同一基板上に形成し、基板面にほぼ平行な方向の電界を液晶層に印加するようにしたＩＰＳ方式の液晶表示装置がある（例えば、特許文献１参照）。   There is an IPS liquid crystal display device in which a pair of electrodes for applying an electric field to liquid crystal is formed on the same substrate, and an electric field in a direction substantially parallel to the substrate surface is applied to the liquid crystal layer (for example, Patent Documents) 1).

このようなＩＰＳ方式の液晶表示装置は、視野角が広いことから、大型のＰＣモニタ、高品質テレビに採用されている。しかし、一般にＴＮ方式の液晶表示装置に比べて焼き付きが大きく、どの製品にも設計によらず焼き付きが発生することから、ＩＰＳ方式の液晶表示装置における最大の弱点となっており、抜本的な解決が行われていない。   Such an IPS liquid crystal display device has been adopted for large PC monitors and high-quality televisions because of its wide viewing angle. However, in general, the image sticking is larger than that of the TN liquid crystal display device, and the image sticking occurs regardless of the design of any product. Is not done.

特許第３５６４７０４号公報Japanese Patent No. 3564704

このような表示面の焼き付きは、電極が櫛型であるために、電極を挟んで左右の液晶表示部に加わる電界の向きが逆となるためである。そのため、ＴＦＴのオフ時に寄生容量の影響を除くために画素電極を挟んだ片方の共通電極へのＤＣ成分を最小に調整したときに、もう片方の共通電極はＤＣが残ってしまう。   Such display image sticking is due to the fact that the direction of the electric field applied to the left and right liquid crystal display portions is reversed with the electrodes sandwiched between the electrodes because the electrodes are comb-shaped. Therefore, when the DC component to one common electrode sandwiching the pixel electrode is adjusted to the minimum in order to eliminate the influence of the parasitic capacitance when the TFT is turned off, DC remains in the other common electrode.

さらに説明すると、３本の電極を平面に平行に並べ、外側の２本の電極に０Ｖ、内側の電極に１Ｖを加えると、電界は内側の電極から２本の外側の電極に向かうことは自明である。実際のＴＦＴ−ＬＣＤでは交流化しているが、歪んだパルスを与えるために共通電極の電圧を調整する。しかし、ＤＣ０にはできないので、ある値のＤＣが発生する。   To explain further, it is obvious that when three electrodes are arranged in parallel to each other and 0V is applied to the two outer electrodes and 1V is applied to the inner electrodes, the electric field is directed from the inner electrodes to the two outer electrodes. It is. In an actual TFT-LCD, alternating current is used, but the voltage of the common electrode is adjusted to give a distorted pulse. However, since DC0 cannot be achieved, a certain value of DC is generated.

液晶内部には電気二重層が発生していることが知られている。この発生箇所としては、電極と、配向膜界面と、配向膜及び液晶界面がある。そして、この電気二重層は、この３つの材料の性質で向きと大きさが決まる。ＩＰＳ方式の液晶表示装置の場合は、内側の電極から一方の外側の電極に向かう電界の方向と、内側の電極から他方の外側の電極に向かう電界の方向とに電気二重層成分があるときに、ＤＣ成分が右半分と左半分で異なってくる。従って、Ｖｃｏｍ調整を行ったときに、ＤＣ成分が残り、しいては焼き付きの原因となる。   It is known that an electric double layer is generated inside the liquid crystal. The occurrence location includes an electrode, an alignment film interface, and an alignment film and liquid crystal interface. The direction and size of the electric double layer are determined by the properties of the three materials. In the case of an IPS liquid crystal display device, when there is an electric double layer component in the direction of the electric field from the inner electrode to one outer electrode and the direction of the electric field from the inner electrode to the other outer electrode The DC component differs between the right half and the left half. Therefore, when the Vcom adjustment is performed, the DC component remains and causes burn-in.

この発明は上述した点に鑑みてなされたもので、ＩＰＳ方式の液晶表示装置における表示面の焼き付きを改善することができる画素構造を有する液晶表示装置を得ることを目的とする。   The present invention has been made in view of the above points, and an object of the present invention is to obtain a liquid crystal display device having a pixel structure capable of improving image sticking in an IPS liquid crystal display device.

この発明に係る液晶表示装置は、液晶に電界を印加するための画素電極と共通電極とを同一基板上に対向して形成し、当該基板面にほぼ平行な方向の電界を液晶層に印加するようにしたＩＰＳ方式の液晶表示装置において、前記画素電極と前記共通電極は、櫛型形状でなり、共通電極間に位置する画素電極を、一方の共通電極側に近づけて配置させた場合に、共通電極と画素電極との間隔が狭くなる領域となる、画素内の対向する電極間間隔の表示に寄与しない領域の幅を狭めることで、表示に寄与する領域の電界方向を一方向にするように配置し、前記画素内の対向する電極間間隔の表示に寄与しない領域の幅は、前記画素電極と前記共通電極が形成される基板と対向する基板側に設けられる遮光用のブラックマトリックスの範囲内に収まるように狭められることを特徴とする。 In the liquid crystal display device according to the present invention, the pixel electrode and the common electrode for applying an electric field to the liquid crystal are formed on the same substrate so as to be opposite to each other, and an electric field in a direction substantially parallel to the substrate surface is applied to the liquid crystal layer. In the IPS mode liquid crystal display device as described above, the pixel electrode and the common electrode have a comb shape, and when the pixel electrode positioned between the common electrodes is arranged close to one common electrode side, By narrowing the width of the region that does not contribute to the display of the distance between the opposing electrodes in the pixel, which is a region where the interval between the common electrode and the pixel electrode is narrowed , the electric field direction of the region contributing to the display is made one direction. The width of the region that does not contribute to display of the spacing between the opposing electrodes in the pixel is a range of a black matrix for light shielding provided on the substrate side facing the substrate on which the pixel electrode and the common electrode are formed. Fits in Wherein the narrowed as.

この発明によれば、画素内の対向する画素電極と共通電極を、両電極間間隔の表示に寄与しない領域の幅を狭めて、表示に寄与する領域の電界方向を一方向にするように配置することで、ＤＣ発生も常に同じ方向となるので、Ｖｃｏｍ調整でＤＣ発生を抑えることができるため、画素内のＤＣ発生を抑えて、焼き付きを改善することができる。   According to the present invention, the opposing pixel electrode and common electrode in the pixel are arranged so that the width of the region that does not contribute to the display of the distance between the two electrodes is narrowed, and the electric field direction of the region that contributes to the display is one direction. As a result, the DC generation is always in the same direction, and the DC generation can be suppressed by the Vcom adjustment. Therefore, the DC generation in the pixel can be suppressed and the burn-in can be improved.

図１は、この発明に係るＩＰＳ方式の液晶表示装置を説明するもので、画素構造を示す図である。ＩＰＳ方式の液晶表示装置は、上側基板と下側基板及び両者の間隙に充填される液晶層からなり、下側基板に形成された画素電極と共通電極の間に電圧を印加して両電極間に形成される電界を制御し、液晶の配向状態を制御してパネルを透過するバックライト光の透過率を変化させる。このとき、下側基板面にほぼ平行な方向の電界を発生させて液晶層に印加する。   FIG. 1 is a diagram illustrating a pixel structure for explaining an IPS liquid crystal display device according to the present invention. The IPS liquid crystal display device is composed of an upper substrate and a lower substrate and a liquid crystal layer filled in a gap between them, and a voltage is applied between a pixel electrode and a common electrode formed on the lower substrate so that the gap between the two electrodes is reduced. The transmittance of the backlight light that is transmitted through the panel is changed by controlling the electric field formed in the light source and controlling the alignment state of the liquid crystal. At this time, an electric field in a direction substantially parallel to the lower substrate surface is generated and applied to the liquid crystal layer.

図１に示す画素電極１と共通電極２は下側基板上に形成され、画素電極１はゲートラインをデータラインの交差部ごとに形成されるＴＦＴに接続され、共通電極２は画素電極１に対向して形成されている。対向する画素電極１と共通電極２はともに櫛型形状に形成されている。   The pixel electrode 1 and the common electrode 2 shown in FIG. 1 are formed on the lower substrate, the pixel electrode 1 is connected to a TFT formed with a gate line at each intersection of the data lines, and the common electrode 2 is connected to the pixel electrode 1. They are formed to face each other. The opposing pixel electrode 1 and common electrode 2 are both formed in a comb shape.

ここで、画素内の対向する画素電極１と共通電極２は、電極間間隔の表示に寄与しない領域の幅ａを狭めることで、表示に寄与する領域の電界方向を一方向にするように配置する。すなわち、図１において、画素電圧が正の時に、矢印で示すように、画素電極１の図中右方向のみの電界を発生させ、画素電圧が負の時に、矢印とは逆の図中左方向のみに電界を発生させるようにする。   Here, the opposing pixel electrode 1 and common electrode 2 in the pixel are arranged so that the electric field direction of the region contributing to the display becomes one direction by narrowing the width a of the region that does not contribute to the display of the inter-electrode spacing. To do. That is, in FIG. 1, when the pixel voltage is positive, an electric field only in the right direction of the pixel electrode 1 is generated as indicated by an arrow, and when the pixel voltage is negative, the left direction of the drawing is opposite to the arrow. Only an electric field is generated.

また、画素内の対向する画素電極１と共通電極２の電極間間隔の表示に寄与しない領域の幅ａは、上側基板に設けられる遮光用のブラックマトリックスの範囲内に収まるよう狭めればよい。   Further, the width a of the region that does not contribute to the display of the inter-electrode distance between the opposing pixel electrode 1 and common electrode 2 in the pixel may be narrowed so as to be within the range of the black matrix for light shielding provided on the upper substrate.

したがって、この発明の実施の形態によれば、画素内の対向する画素電極１と共通電極２を、両電極間間隔の表示に寄与しない領域の幅ａを狭めて、表示に寄与する領域の電界方向を一方向にするように配置することにより、画素内の電界方向を常に一方向にすることができ、これによってＤＣ発生も常に同じ方向となるので、Ｖｃｏｍ調整でＤＣ発生を抑えることができる。このため、画素内のＤＣ発生を抑えて、焼き付きを改善することができる。   Therefore, according to the embodiment of the present invention, the electric field of the region contributing to display is reduced by reducing the width a of the region that does not contribute to the display of the distance between the electrodes of the opposing pixel electrode 1 and common electrode 2 in the pixel. By arranging so that the direction is one direction, the electric field direction in the pixel can always be one direction, and the DC generation is always the same direction, so the DC generation can be suppressed by Vcom adjustment. . For this reason, it is possible to suppress the occurrence of DC in the pixel and improve the burn-in.

この発明に係るＩＰＳ方式の液晶表示装置を説明するもので、画素構造を示す図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a pixel structure for explaining an IPS liquid crystal display device according to the present invention.

符号の説明Explanation of symbols

１ 画素電極、２ 共通電極、ａ 電極間間隔の表示に寄与しない領域の幅。   1 pixel electrode, 2 common electrode, a width of a region that does not contribute to display of an inter-electrode spacing.

Claims (1)

液晶に電界を印加するための画素電極と共通電極とを同一基板上に対向して形成し、当該基板面にほぼ平行な方向の電界を液晶層に印加するようにしたＩＰＳ方式の液晶表示装置において、
前記画素電極と前記共通電極は、櫛型形状でなり、共通電極間に位置する画素電極を、一方の共通電極側に近づけて配置させた場合に、共通電極と画素電極との間隔が狭くなる領域となる、画素内の対向する電極間間隔の表示に寄与しない領域の幅を狭めることで、表示に寄与する領域の電界方向を一方向にするように配置し、
前記画素内の対向する電極間間隔の表示に寄与しない領域の幅は、前記画素電極と前記共通電極が形成される基板と対向する基板側に設けられる遮光用のブラックマトリックスの範囲内に収まるように狭められる
ことを特徴とする液晶表示装置。 An IPS-type liquid crystal display device in which a pixel electrode and a common electrode for applying an electric field to liquid crystal are formed opposite to each other on the same substrate, and an electric field in a direction substantially parallel to the substrate surface is applied to the liquid crystal layer In
The pixel electrode and the common electrode have a comb shape, and when the pixel electrode positioned between the common electrodes is arranged close to one common electrode side, the interval between the common electrode and the pixel electrode is narrowed. the region, by narrowing the width of the region that does not contribute to the display of the gap between electrodes facing in a pixel, arranged an electric field direction of a region contributing to display so that in one direction,
The width of the region in the pixel that does not contribute to the display of the distance between the opposing electrodes is within the range of the black matrix for light shielding provided on the substrate side facing the substrate on which the pixel electrode and the common electrode are formed. A liquid crystal display device characterized by being narrowed to a minimum.
JP2007288657A 2007-11-06 2007-11-06 Liquid crystal display Expired - Fee Related JP5426823B2 (en)

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CN104503160A (en) * 2014-12-18 2015-04-08 深圳市华星光电技术有限公司 Liquid crystal display panel and liquid crystal display device
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JP3031317B2 (en) * 1997-11-20 2000-04-10 日本電気株式会社 Active matrix liquid crystal display
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