KR20040012211A - LCD for descreasing light leakage - Google Patents

LCD for descreasing light leakage Download PDF

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Publication number
KR20040012211A
KR20040012211A KR1020020045654A KR20020045654A KR20040012211A KR 20040012211 A KR20040012211 A KR 20040012211A KR 1020020045654 A KR1020020045654 A KR 1020020045654A KR 20020045654 A KR20020045654 A KR 20020045654A KR 20040012211 A KR20040012211 A KR 20040012211A
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South Korea
Prior art keywords
liquid crystal
crystal display
light leakage
counter electrode
data line
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KR1020020045654A
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Korean (ko)
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유세종
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비오이 하이디스 테크놀로지 주식회사
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Priority to KR1020020045654A priority Critical patent/KR20040012211A/en
Publication of KR20040012211A publication Critical patent/KR20040012211A/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
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • 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
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned
    • 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
    • G02F1/136222—Colour filters incorporated in the active matrix substrate
    • 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)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A liquid crystal display for reducing light leakage is provided to decrease light leakage so as to improve aperture ratio and luminance of the liquid crystal display. CONSTITUTION: A liquid crystal display includes an array substrate(41) and a color filter substrate(51) arranged having a predetermined distance therebetween, a liquid crystal layer(61) interposed between the two substrates, and a data line(45) located at the center of the array substrate. The liquid crystal display further includes a pixel electrode(49) arranged at both sides of the data line, a common electrode(53) formed on the color filter substrate, and a counter electrode(55) located on the liquid crystal layer, corresponding to the data line. A voltage, which makes the counter electrode have a voltage difference of 4V from the voltage of a gate line, is applied to the counter electrode.

Description

빛누설 감소용 액정표시장치{LCD for descreasing light leakage}Liquid crystal display for light leakage reduction {LCD for descreasing light leakage}

본 발명은 액정표시장치에 관한 것으로서, 보다 상세하게는 신호라인 형성부의 상부에 전극을 두어 신호라인과의 사이에 있는 액정을 다크(dark)에 가까운 상태로 만드는 고정 전계를 형성하여 빛 누설을 줄여 개구율 증가 및 휘도를 증가시키는 빛누설 감소용 액정표시장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to reduce light leakage by forming a fixed electric field in which an electrode is placed on an upper portion of a signal line forming portion to make a liquid crystal between the signal lines close to a dark state. The present invention relates to a liquid crystal display device for reducing light leakage which increases aperture ratio and increases luminance.

종래기술에 따른 LCD 패널에서의 빛 누설에 대해 도 1을 참조하여 설명하면 다음과 같다.The light leakage in the LCD panel according to the prior art will be described with reference to FIG. 1.

도 1은 종래기술에 따른 LCD패널에서의 빛 누설이 발생하는 것을 설명하기 위한 LCD 패널 구성의 개략도이다.1 is a schematic diagram of an LCD panel configuration for explaining that light leakage occurs in the LCD panel according to the prior art.

종래기술에 따른 LCD 패널의 구성은, 도 1에 도시된 바와같이, 어레이기판(11)과 칼라필터기판(21)사이에 액정층(31)이 개재되어 있다.In the LCD panel according to the related art, as shown in FIG. 1, the liquid crystal layer 31 is interposed between the array substrate 11 and the color filter substrate 21.

또한, 상기 어레이기판(11)상에 절연막(13)이 형성되고, 상기 절연막(13)의 중앙상단에 데이터라인(15)이 형성되어 있으며, 데이터라인(15)과 이웃하는 좌우측 지역에는 화소전극(19)이 형성되어 있다. 여기서, 상기 화소전극(19)은 제1절연막(13)상에 형성된 제2절연막(17)상에 형성되어 있다.In addition, an insulating film 13 is formed on the array substrate 11, and a data line 15 is formed at an upper center of the insulating film 13, and pixel electrodes are formed in left and right regions adjacent to the data line 15. (19) is formed. The pixel electrode 19 is formed on the second insulating film 17 formed on the first insulating film 13.

그리고, 상기 칼라필터기판(21)하측 전체에는 투명한 재질로 된 공통전극(23)이 형성되어 있다.The common electrode 23 made of a transparent material is formed on the entire lower side of the color filter substrate 21.

도 1에서와같이, 종래기술에 의하면, 종래의 LCD 제품에서 데이터라인 형성부는 액정의 방향을 제어하지 못하므로 빛이 투과되지 않아야 하는 경우의 화소상태에서도 데이터라인주변부의 빛샘현상이 발생하여 이의 방지를 위하여 블랙매트릭스(이하 BM)라는 별도의 층을 형성하여 빛샘을 차단하였으므로 블랙매트릭스로 차단되어 있는 영역은 개구율 감소의 원인 즉 휘도감소의 원인이 되어 왔다. 즉, 중앙의 데이터라인을 중심으로 좌측 화소는 화이트(white), 우측 화소는 다크(dark)상태인데 데이터라인부는 좌측에서와 같이 화이트상태가 되어 빛샘이 발생한다.As shown in FIG. 1, according to the related art, since the data line forming unit does not control the direction of liquid crystal in a conventional LCD product, light leakage occurs around the data line even in a pixel state where light should not be transmitted. In order to block the light leakage by forming a separate layer called the black matrix (hereinafter referred to as BM), the area blocked by the black matrix has been the cause of the decrease in the aperture ratio, that is, the luminance decrease. That is, the left pixel is white and the right pixel is dark while the center of the data line is centered, but the data line becomes white as in the left side, and light leakage occurs.

이에 본 발명은 상기 종래기술의 제반 문제점을 해결하기 위하여 안출한 것으로서, 빛의 누설을 줄여 개구율 증가 및 휘도를 증가시킬 수 있는 빛누설 감소용 액정표시장치를 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide a liquid crystal display device for reducing light leakage that can increase the aperture ratio and increase luminance by reducing light leakage.

도 1은 종래기술에 따른 LCD패널에서의 빛 누설이 발생하는 것을 설명하기 위한 LCD 패널 구성의 개략도.1 is a schematic diagram of an LCD panel configuration for explaining that light leakage occurs in the LCD panel according to the prior art.

도 2는 본 발명에 따른 빛누설 감소용 액정표시장치를 설명하기 위한 단면2 is a cross-sectional view illustrating a liquid crystal display for reducing light leakage according to the present invention.

도.Degree.

[도면부호의설명][Description of Drawing Reference]

41 : 어레이기판43 : 제1절연막41: array substrate 43: first insulating film

45 : 데이터라인47 : 제2절연막45: data line 47: second insulating film

49 : 화소전극51 : 칼라필터기판49 pixel electrode 51 color filter substrate

53 : 공통전극55 : 상대전극(카운터전극)53: common electrode 55: counter electrode (counter electrode)

61 : 액정층63 : 액정61 liquid crystal layer 63 liquid crystal

상기 목적을 달성하기 위한 본 발명에 따른 빛누설 감소용 액정표시장치는, 상하로 일정한 간격을 두고 배치되는 어레이기판과 칼라필터기판; 이들 기판사이에 개재되는 액정층; 상기 어레이기판의 중앙에 배치되는 데이터라인; 상기 데이터라인과 이웃하는 좌우측에 배치되는 화소전극; 상기 칼라필터기판의 하측에 배치되는 공통라인; 상기 데이터라인과 대응되는 상기 액정층상측에 배치되는 상대전극을 포함하여 구성되는 것을 특징으로한다.According to an aspect of the present invention, there is provided a liquid crystal display device for reducing light leakage, comprising: an array substrate and a color filter substrate disposed at regular intervals up and down; A liquid crystal layer interposed between these substrates; A data line disposed in the center of the array substrate; Pixel electrodes disposed on left and right sides adjacent to the data lines; A common line disposed below the color filter substrate; And a counter electrode disposed on the liquid crystal layer corresponding to the data line.

(실시예)(Example)

이하, 본 발명에 따른 빛누설 감소용 액정표시장치를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a liquid crystal display for light leakage reduction according to the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 빛누설 감소용 액정표시장치를 설명하기 위한 단면도이다.2 is a cross-sectional view illustrating a liquid crystal display for reducing light leakage according to the present invention.

본 발명에 따른 빛누설 감소용 액정표시장치의 구성은, 도 2에 도시된 바와같이, 어레이기판(41)과 칼라필터기판(51)사이에 다수의 액정(63)들로 이루어진 액정층(61)이 개재되어 있다.As shown in FIG. 2, a liquid crystal layer 61 including a plurality of liquid crystals 63 is disposed between the array substrate 41 and the color filter substrate 51, as shown in FIG. 2. ) Is intervened.

또한, 상기 어레이기판(41)상에 절연막(43)이 형성되고, 상기 절연막(43)의중앙상단에 데이터라인(45)이 형성되어 있으며, 상기 데이터라인(45)과 이웃하는 좌우측 지역에는 화소전극(49)이 형성되어 있다. 여기서, 상기 화소전극(49)은 제1절연막(43)상에 형성된 제2절연막(47)상에 형성되어 있다.In addition, an insulating film 43 is formed on the array substrate 41, and a data line 45 is formed at the top of the insulating film 43, and pixels are disposed in left and right regions adjacent to the data line 45. An electrode 49 is formed. The pixel electrode 49 is formed on the second insulating film 47 formed on the first insulating film 43.

그리고, 상기 칼라필터기판(51)하측 전체에는 투명한 재질로 된 공통전극(53)이 형성되어 있다.The common electrode 53 made of a transparent material is formed on the entire lower side of the color filter substrate 51.

더욱이, 상기 데이터라인(45)과 대응하는 상기 공통전극(53)하측 지역에는 상대전극(55)이 형성되어 있다. 즉, 상기 데이터라인 형성부의 상부에 데이터라인과 수직전계를 형성할 수 있는 전극을 두어(일반적으로 칼라필터부에 위치) 데이터라인부에서는 항상 수직전계가 발생하여 액정의 배열이 수직으로 형성되게 되므로써 디스플레이 화면상에는 다크(dark)상태로 보이게 되어 데이터라인 전계에 의한 빛샘현상을 줄일 수 있게 된다.In addition, a counter electrode 55 is formed in a region under the common electrode 53 corresponding to the data line 45. That is, by placing an electrode capable of forming a vertical electric field with the data line on the data line forming part (generally located in the color filter part), a vertical electric field is always generated in the data line part so that the arrangement of liquid crystals is formed vertically. It appears dark on the display screen, thereby reducing light leakage caused by the data line electric field.

또한, 데이터라인상부의 전극에는 액정이 수직으로 배열될 수 있도록 동작시키는 전위차(예를들면, 4V 정도)를 갖도록 전압을 걸어 준다.In addition, a voltage is applied to an electrode on the data line so as to have a potential difference (for example, about 4V) for operating the liquid crystals to be arranged vertically.

그리고, 상기 상대전극은 게이트라인의 상부, 칼라필터기판측 또는 스토리지전극위에 형성할 수도 있다. 이때, 상기 상기 상대전극에 스토리지전극과 4V 가량의 전위차를 갖도록 전압을 인가하는 방식을 사용할 수 있다.The counter electrode may be formed on the gate line, the color filter substrate side, or the storage electrode. In this case, a voltage may be applied to the counter electrode to have a potential difference of about 4V with the storage electrode.

한편, 도 2에서는 일반적인 TN 모드의 LCD 상태에서의 적용예를 도시하였으므로 이와 같은 수직전계를 이용하여 신호라인형성부의 액정을 고정하여 빛의 누설을 줄이는 다른 응용도 본 발명의 범주에 포함된다. 즉, TN 모드와 IPS, FFS 등의 수평전계를 사용하는 장치 또는 VA, ASV, PVA, MVA 등의 수직전계를 사용하는 장치에 적용가능하며, 데이터라인외의 게이트라인, 공통라인(common line)에도 적용가능하다.On the other hand, Figure 2 shows an application example in the LCD state of the general TN mode, another application for reducing the leakage of light by fixing the liquid crystal of the signal line forming unit using such a vertical electric field is included in the scope of the present invention. That is, it can be applied to devices using horizontal electric fields such as TN mode and IPS, FFS, or devices using vertical electric fields such as VA, ASV, PVA, MVA, etc., and can be applied to gate lines and common lines other than data lines. Applicable.

한편, 빛 누설(light leakage)을 줄이는 영역에 블랙매트릭스(black matrix)를 제거하는 방식을 사용하거나 빛누설을 줄이는 영역에 블랙매트릭스 폭을 줄이는 방식을 사용할 수도 있다.Meanwhile, the black matrix may be removed in an area of reducing light leakage or the black matrix width may be reduced in an area of reducing light leakage.

상기에서 설명한 바와같이, 본 발명에 따른 빛누설 감소용 액정표시장치에 의하면, 신호라인 형성부의 상부에 전극을 두어 신호라인과의 사이에 있는 액정을 다크(dark)에 가까운 상태로 만드는 고정 전계를 형성하여 데이터라인 형성부의 블랙매트릭스영역을 줄이거나 또는 제거할 수 있으므로 개구율 증가 및 휘도상승을 통한 품질개선의 효과를 기대할 수 있다.As described above, according to the liquid crystal display device for light leakage reduction according to the present invention, a fixed electric field is formed in which the liquid crystal between the signal line and the electrode is placed on top of the signal line forming portion to bring the liquid crystal between the signal lines to a dark state. Since the black matrix area of the data line forming part can be reduced or removed, the quality improvement can be expected by increasing the aperture ratio and increasing the luminance.

한편, 본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능할 것이다.On the other hand, the present invention is not limited to the above-described specific preferred embodiments, and various changes can be made by those skilled in the art without departing from the gist of the invention claimed in the claims. will be.

Claims (6)

상하로 일정한 간격을 두고 배치되는 어레이기판과 칼라필터기판;An array substrate and a color filter substrate disposed at regular intervals up and down; 이들 기판사이에 개재되는 액정층;A liquid crystal layer interposed between these substrates; 상기 어레이기판의 중앙에 배치되는 데이터라인;A data line disposed in the center of the array substrate; 상기 데이터라인과 이웃하는 좌우측에 배치되는 화소전극;Pixel electrodes disposed on left and right sides adjacent to the data lines; 상기 칼라필터기판의 하측에 배치되는 공통라인;A common line disposed below the color filter substrate; 상기 데이터라인과 대응되는 상기 액정층상측에 배치되는 상대전극을 포함하여 구성되는 것을 특징으로하는 빛누설 감소용 액정표시장치.And a counter electrode disposed on the liquid crystal layer corresponding to the data line. 제1항에 있어서, 상기 빛누설개선용 액정표시장치는 TN모드를 사용하는 장치, IPS 또는 FFS 의 수평전계를 사용하는 장치 또는 VA, ASV, PVA, MVA 등의 수직전계를 사용하는 장치에 적용하는 것을 특징으로하는 빛누설 감소용 액정표시장치.The liquid crystal display device of claim 1, wherein the liquid crystal display for light leakage improvement is applied to a device using a TN mode, a device using a horizontal field of IPS or FFS, or a device using a vertical field such as VA, ASV, PVA, MVA. Light leakage reduction liquid crystal display device characterized in that. 제1항에 있어서, 상기 상대전극에 게이트라인의 전압과 4V 정도의 전위차를 갖도록 전압을 인가하는 방식을 사용하는 것을 특징으로 하는 빛누설 감소용 액정표시장치.The liquid crystal display of claim 1, wherein a voltage is applied to the counter electrode to have a potential difference of about 4V from a voltage of a gate line. 제1항에 있어서, 상기 상대전극을 칼라필터기판측에 형성하는 것을 특징으로하는 빛누설 감소용 액정표시장치.The liquid crystal display for reducing light leakage according to claim 1, wherein the counter electrode is formed on a color filter substrate side. 제1항에 있어서, 상기 스토리지전극위에 상대전극을 형성하는 것을 특징으로하는 빛누설 감소용 액정표시장치.The liquid crystal display of claim 1, wherein a counter electrode is formed on the storage electrode. 제5항에 있어서, 상기 상대전극에 스토리지전극과 4V 가량의 전위차를 갖도록 전압을 인가하는 방식을 사용하는 것을 특징으로하는 빛누설 감소용 액정표시장치.The liquid crystal display of claim 5, wherein a voltage is applied to the counter electrode to have a potential difference of about 4V with the storage electrode.
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