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KR100325475B1 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
KR100325475B1
KR100325475B1 KR1019950014605A KR19950014605A KR100325475B1 KR 100325475 B1 KR100325475 B1 KR 100325475B1 KR 1019950014605 A KR1019950014605 A KR 1019950014605A KR 19950014605 A KR19950014605 A KR 19950014605A KR 100325475 B1 KR100325475 B1 KR 100325475B1
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South Korea
Prior art keywords
pixel electrode
liquid crystal
crystal display
pair
pixel electrodes
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KR1019950014605A
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Korean (ko)
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KR970002397A (en
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황정태
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주식회사 현대 디스플레이 테크놀로지
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Priority to KR1019950014605A priority Critical patent/KR100325475B1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • 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
    • G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
    • 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
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel

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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)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Geometry (AREA)

Abstract

PURPOSE: A liquid crystal display is provided to change the structure of a pixel electrode so as to compensate for a reduction in optical transmissivity of the pixel electrode. CONSTITUTION: A liquid crystal display includes a pair of transparent substrates, a display medium of which optical characteristic is modulated in response to voltage applied thereto and which is filled between the pair of transparent substrates, and a pixel electrode(11) arranged on the inner surface of one of the pair of transparent substrates in matrix form. Each pixel electrode includes a plurality of split pixel electrodes. The liquid crystal display further includes a switching element electrically connected to each split pixel electrode, a data line(13) for applying a data signal voltage to each split pixel electrode through the switching element, and a gate line(12) for applying driving voltage for driving each switching element. Each of the pixel electrodes is formed on one of the transparent substrates by selective etching.

Description

액정표시소자LCD

본 발명은 액정표시소자에 관한 것으로, 특히 이러한 장치들에 관한 화소전극구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to liquid crystal display devices, and more particularly to a pixel electrode structure relating to such devices.

일반적으로 박막 트랜지스터는 수직 행과 수평 열로 배열된 화소들의 매트릭스로 구성된다. 개개의 액정은 액정셀의 배열을 결정하는 특정 전극들에 의하여 한정된다. 활성 매트릭스형 액정표시소자에서, 각각의 액정 셀은 박막 트랜지스터와 관련되거나 아니면 상기 액정을 선택적으로 온, 오프하는 스위치로서 작용하는 고상 스위치 장치와 관련된다. 스캐닝 버스라인(게이트 라인)들은 화소전극들의 행 위치에 수평으로 뻗어 있고, 그 라인들은 박막 트랜지스터를 구성하는 게이트 전극에 연결된다. 따라서 화소전극들의 완전한 수평 스캐닝 라인들은 특정 스캐닝 라인의 선택에 의하여 동시에 턴온된다. 데이타 라인들은 화소전극들 사이에 수직렬로 뻗어있고, 그것은 특정열의 화소전극들에게 영상 데이타 신호들을 적용시키기 위하여 사용된다. 그러나 전원을 공급받은 박막 트랜지스터 소자들과 관련된 화소들만이 데이타 신호를 수신하기 때문에 한 번에 한 라인씩 표시된다.In general, a thin film transistor is composed of a matrix of pixels arranged in vertical rows and horizontal columns. Individual liquid crystals are defined by specific electrodes that determine the arrangement of liquid crystal cells. In an active matrix liquid crystal display, each liquid crystal cell is associated with a thin film transistor or with a solid state switch device which acts as a switch for selectively turning on and off the liquid crystal. The scanning bus lines (gate lines) extend horizontally to the row positions of the pixel electrodes, and the lines are connected to the gate electrode constituting the thin film transistor. Thus, the complete horizontal scanning lines of the pixel electrodes are simultaneously turned on by the selection of a particular scanning line. The data lines extend vertically between the pixel electrodes, which are used to apply image data signals to the pixel electrodes of a specific column. However, because only the pixels associated with the powered thin film transistor elements receive the data signal, they are displayed one line at a time.

제 1 도는 종래 액정표시소자의 화소전극을 포함한 부분을 도시한 평면도로서, 박막 트랜지스터의 구동을 조절하기 위한 게이트 전극에 전원을 공급하기 위한 게이트 라인(2)과, 상기 게이트 라인에 대하여 수직으로 배열되고, 상기 게이트 라인의 교차부분에서 라인 절연층(7)으로 절연되며, 영상 데이타 신호전압을 박막 트랜지스터의 드레인(5)에 인가하는 데이타 라인(3)과, 화소전극(1)과 전기적으로 연결되는 소오스(4)와, 상기 소오스(5) 및 드레인 하부의 비정질 반도체 층(6)과, 게이트 절연층((8)이 도시되었다.1 is a plan view showing a portion including a pixel electrode of a conventional liquid crystal display device, the gate line 2 for supplying power to the gate electrode for controlling the driving of the thin film transistor, and is arranged perpendicularly to the gate line. And is insulated by the line insulating layer 7 at the intersection of the gate line, and electrically connected to the pixel line 1 and the data line 3 for applying an image data signal voltage to the drain 5 of the thin film transistor. The source 4, the amorphous semiconductor layer 6 under the source 5 and the drain, and the gate insulating layer 8 are shown.

종래기술의 화소전극은 게이트 라인(2)과 데이타 라인(3)이 형성하는 사각형 중 모서리 부분의 박막 트랜지스터들의 공간(space)을 제외한 부분에 투명전극(Indium Tin Oxide : 이하 ITO 로 약칭)이 형성된 구조를 가진다.In the prior art pixel electrode, a transparent electrode (Indium Tin Oxide: hereinafter abbreviated as ITO) is formed in a portion of the quadrangle formed by the gate line 2 and the data line 3 except for the space of the thin film transistors at the corners. Has a structure.

그러나 이러한 구조의 액티브 매트릭스형 액정표시소자에서 광원인 백라이터로부터 조사된 빛은 상기한 구성의 하판과 도면에 미도시한 액정 및 액정위의 상판을 통과하게 되는데, 이러한 빛의 투과율은 8 - 10 % 에 지나지 않는다. 이러한 빛의 투과율을 저하시키는 요인으로는 상하판의 편광판, 상판의 블랙 매트릭스, 하판의 박막 트랜지스터 등 여러가지 요인이 존재하지만, 상기 언급한 것 외에도 화소전극 역시 투과율은 저하시키는 하나의 요인이다.However, in the active matrix liquid crystal display device having such a structure, light emitted from the backlight of the light source passes through the lower plate of the above-described configuration and the upper plate of the liquid crystal and the liquid crystal on the liquid crystal, which are not shown in the drawing. Only%. There are various factors such as lowering the transmittance of light, such as a polarizing plate of the upper and lower plates, a black matrix of the upper plate, and a thin film transistor of the lower plate, but in addition to the above-mentioned, the pixel electrode is also one factor of decreasing the transmittance.

따라서 본 발명은 광의 투과율을 저하시키는 요인들 중 투명전극 자체의 투과율 감소요인을 제거할 수 있는 액정표시소자의 화소전극구조를 제공하기 위한 것이다.Accordingly, an object of the present invention is to provide a pixel electrode structure of a liquid crystal display device capable of eliminating the factor of decreasing transmittance of the transparent electrode itself among the factors that lower the transmittance of light.

이와같은 본 발명의 액정표시소자는 한 쌍의 투광성 기판과, 한 쌍의 투광성 기판 사이에서 충전되고 그의 광학특성이 인가전압에 응답하여 변조될 수 있는 표시매체와, 한쌍의 기판중의 하나의 내부표면상에 매트릭스로 배열되어 있고, 각각 복수의 분할화소전극을 포함하는 화소전극과, 각 분할화소전극이 형성된 동일 기판에 각 분할화소전극과 전기적으로 접속되는 스위칭 소자와, 개개의 분할화소전극에 스위칭 소자를 통하여 데이타 신호전압을 인가하는 데이타 라인과, 개개의 스위칭 소자를 구동하기 위한 구동전압을 인가하는 게이트 라인을 구비한 액정표시장치에 있어서, 개개의 화소전극을 하나의 투광성 기판 상에서 그 자체의 전기적 연결을 유지하면서 선택적으로 식각하여 구성한 것을 특징으로 한다.Such a liquid crystal display device of the present invention comprises a pair of translucent substrates, a display medium charged between the pair of translucent substrates and whose optical characteristics can be modulated in response to an applied voltage, and inside one of the pair of substrates A pixel electrode arranged in a matrix on the surface, each pixel electrode including a plurality of divided pixel electrodes, a switching element electrically connected to each divided pixel electrode on the same substrate on which each divided pixel electrode is formed, and each divided pixel electrode; 1. A liquid crystal display device having a data line for applying a data signal voltage through a switching element and a gate line for applying a driving voltage for driving each switching element, wherein each pixel electrode is formed on a single transparent substrate. It is characterized in that it is configured by selectively etching while maintaining the electrical connection of.

이하, 첨부한 도면에 의거하여 본 발명의 일 실시예를 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

첨부한 도면 제 2 도는 본 발명 액정표시소자의 화소전극 및 스위칭 소자인 박막 트랜지스터의 일부분을 표시한 평면도이다.2 is a plan view showing a portion of the pixel electrode and the switching element of the liquid crystal display device of the present invention.

박막 트랜지스터의 구성 요소 중 미도시된 게이트는 게이트 라인(12)에 전기적으로 연결되고, 드레인(15)은 상기 게이트 라인(12)과는 수직으로 위치하여 영상데이타 신호를 전송하기 위한 데이타 라인(13)에, 소오스(14)는 액정셀의 화소전극(11)에 전기적으로 연결된다. 상기 데이타 라인(13)을 통하여 드레인(15)에 인가된 신호전압은 화소전극(11)을 구동시켜 광을 투과시키게 되는데, 도면에 도시한 것처럼, 화소전극을 전기적 연결이 끊어지지 않도록 하여 소정의 선폭단위로 식각하게 되면, 식각된 부분들에서는 투명전극 자체에 의한 투과율 감소요인이 없어지므로 빛의 투과율을 증가시킬 수 있다.Among the components of the thin film transistor, a non-illustrated gate is electrically connected to the gate line 12, and the drain 15 is positioned perpendicular to the gate line 12 to transmit a data data signal 13. ), The source 14 is electrically connected to the pixel electrode 11 of the liquid crystal cell. The signal voltage applied to the drain 15 through the data line 13 drives the pixel electrode 11 to transmit light. As shown in the drawing, a predetermined voltage is prevented so that the pixel electrode is not electrically disconnected. When etching by the line width unit, the transmittance decrease factor due to the transparent electrode itself is removed in the etched portion can increase the transmittance of light.

본 발명의 실시예에서는 식각되는 부분과 식각되지 않는 부분의 선폭을 8 ∼12 ㎛로 동일하게 하므로서 투명전극 자체에 의한 투과율을 50% 개선할 수 있다.In the embodiment of the present invention, the transmittance by the transparent electrode itself can be improved by 50% by making the line width of the portion to be etched and the portion not to be etched equal to 8 to 12 μm.

이상에서 설명한 바와같이 본 발명 액정표시장치는 화소전극구조를 머리빗형상으로 선택적 식각에 의하여 변형시켜 주므로써 화소전극자체에 기인한 광투과율을 50 % 상승시켜 준다. 따라서, 액정표시장치의 화상 해상도를 향상시키는 효과를 제공하게 된다.As described above, the liquid crystal display of the present invention deforms the pixel electrode structure by the selective etching in a hair comb shape, thereby increasing the light transmittance caused by the pixel electrode itself by 50%. Thus, the effect of improving the image resolution of the liquid crystal display device is provided.

여기에서는 본 발명의 특정 실시예에 대해서 설명하고 도시하였지만, 당업자에 의하여 이에 대한 수정과 변형을 할 수 있다. 따라서, 이하, 특허청구의 범위는 본 발명의 진정한 사상과 범위에 속하는 한 모든 수정과 변형을 포함하는 것으로 이해할 수 있다.Although specific embodiments of the present invention have been described and illustrated herein, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

제 1 도는 종래의 액정표시소자의 개략적 평면도1 is a schematic plan view of a conventional liquid crystal display device

제 2 도는 본 발명의 일실시예를 보여주는 액정표시소자의 개략적 평면도2 is a schematic plan view of a liquid crystal display device showing an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

11 : 화소전극 12 : 게이트 라인11 pixel electrode 12 gate line

13 : 데이타 라인 14 : 소오스13 data line 14 source

15 : 드레인 16 : 비정질층15 drain 16 amorphous layer

17 : 라인 절연층17: line insulation layer

Claims (2)

한 쌍의 투광성 기판과, 상기 한 쌍의 투광성 기판 사이에 충진되고 그의 광학특성이 인가전압에 응답하여 변조될 수 있는 표시매체와, 상기 한쌍의 기판 중의 하나의 내부표면상에 매트릭스로 배열되어 있고, 각각 복수의 분할화소전극을 포함하는 화소전극과, 각 분할화소전극이 형성된 동일 기판에 각 분할화소전극과 전기적으로 접속되는 스위칭 소자와, 개개의 분할화소전극에 스위칭 소자를 통하여 데이타 신호전압을 인가하는 데이타 라인과, 개개의 스위칭 소자를 구동하기 위한 구동전압을 인가하는 게이트 라인을 구비한 액정표시장치에 있어서,A pair of translucent substrates, a display medium filled between the pair of translucent substrates and whose optical properties can be modulated in response to an applied voltage, arranged in a matrix on an inner surface of one of the pair of substrates And a data element voltage through a switching element electrically connected to each of the divided pixel electrodes on the same substrate on which the divided pixel electrodes are formed, and a switching element connected to each of the divided pixel electrodes. A liquid crystal display device having a data line to be applied and a gate line to which a driving voltage for driving individual switching elements is applied. 상기 개개의 화소전극을 하나의 투광성 기판 상에서 그 자체의 전기적 연결을 유지하면서 선택적으로 식각하여 구성한 것을 특징으로 하는 액정표시소자Wherein each of the pixel electrodes is selectively etched while maintaining its own electrical connection on one light-transmissive substrate. 제 1 항에 있어서,The method of claim 1, 상기 화소전극의 식각된 형상은 머리빗형상인 것을 특징으로 하는 액정표시소자The etched shape of the pixel electrode has a hair comb shape.
KR1019950014605A 1995-06-02 1995-06-02 Liquid crystal display KR100325475B1 (en)

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Publication number Priority date Publication date Assignee Title
KR100516053B1 (en) * 1998-01-26 2005-12-06 삼성전자주식회사 Flat panel liquid crystal display and manufacturing method thereof

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KR100433511B1 (en) * 1996-12-30 2005-05-09 삼성전자주식회사 Snooping apparatus for cache cohecence

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100516053B1 (en) * 1998-01-26 2005-12-06 삼성전자주식회사 Flat panel liquid crystal display and manufacturing method thereof

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