KR20020040991A - Liquid crystal display for preventing of light stream - Google Patents
Liquid crystal display for preventing of light stream Download PDFInfo
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- KR20020040991A KR20020040991A KR1020000070705A KR20000070705A KR20020040991A KR 20020040991 A KR20020040991 A KR 20020040991A KR 1020000070705 A KR1020000070705 A KR 1020000070705A KR 20000070705 A KR20000070705 A KR 20000070705A KR 20020040991 A KR20020040991 A KR 20020040991A
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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]
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133512—Light shielding layers, e.g. black matrix
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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
- G02F1/136—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
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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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/40—Arrangements for improving the aperture ratio
Abstract
Description
본 발명은 광누출 방지를 위한 액정 표시장치에 관한 것으로, 보다 상세하게액정 패널내의 수직전계를 이용하여 수평전계를 제한함으로써 광누출을 방지함과 동시에 개구율을 향상시킨 광누출 방지를 위한 액정 표시장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display for preventing light leakage, and more particularly, to a liquid crystal display for preventing light leakage by improving horizontal aperture by limiting a horizontal electric field using a vertical electric field in a liquid crystal panel. It is about.
주지된 바와 같이, 저소모전력으로 화상표시를 위한 구동이 가능하면서 경박형의 디스플레이로서는 액정표시장치가 개발되어 다양한 분야에서 디스플레이로 채용되는 상황이다.As is well known, a liquid crystal display device is developed as a light and thin display while being capable of driving for image display with low power consumption, and is employed as a display in various fields.
그러한 액정표시장치는 다수의 화소가 매트릭스 어레이로 배열되어 컬러화상을 구현하는 구조로 형성되는 경우 그 다수의 화소를 스위칭구동하기 위한 스위칭소자로서의 박막트랜지스터(Thin Film Transistor)를 포함하는 드라이버소자들이 형성되는 액티브패널과, R/F/B컬러의 구현을 위한 컬러필터가 형성된 컬러필터패널 및, 상기 액티브패널과 상기 컬러필터패널의 사이에 주입되어 그래픽신호에 따라 배향 방향이 변경되어 광의 투과 또는 차단을 행하는 액정셀을 포함하게 된다.Such a liquid crystal display includes driver devices including a thin film transistor as a switching device for switching and driving a plurality of pixels when a plurality of pixels are arranged in a matrix array to form a color image. A color filter panel formed with an active panel, a color filter for realizing R / F / B colors, and injected between the active panel and the color filter panel to change an orientation direction according to a graphic signal to transmit or block light It includes a liquid crystal cell that performs.
그러한 액정표시장치의 일예로서 알려진 FFS모드의 경우에는 스토리지(Storage) 및 공통전극의 역할을 수행하는 하부전극(즉, 제 1의 ITO전극)의 상부에서 제 2의 ITO전극(즉, 화소전극)이 액정에 전위차를 유발하여 음의 액정이 회전하도록 해서 편광판을 통과하면서 진행되는 광이 그 액정을 통과하도록 하여 화상의 재현을 실행하도록 구성되고, 그러한 점에서 그 FFS모드의 액정표시장치는 IPS모드라든지 TN모드의 TFT-LCD에 비해 우수한 시야각을 제공하게 된다.In the case of the FFS mode known as an example of such a liquid crystal display device, a second ITO electrode (i.e., a pixel electrode) on the top of a lower electrode (i.e., a first ITO electrode) serving as a storage and a common electrode. The liquid crystal display device of the FFS mode is configured to reproduce the image by causing the liquid crystal to cause a potential difference in the liquid crystal so that the negative liquid crystal rotates so that the light that passes through the polarizing plate passes through the liquid crystal. It provides better viewing angle than TFT-LCD in TN mode.
그러한 액정 디스플레이 화소에서 데이터 라인(4)과 픽셀 전극(6)간의 전압차에 의해 발생되는 전계는 도 1 및 2에 도시된 바와 같이, 화면의 품위 저하의 원인이 되고 있다. 특히 FFS(Fringe Field Switching) 모드나 IPS(In PlaneSwitching) 모드 등 수평전계를 이용하는 경우 픽셀 전극(6)과 데이터 라인(4)에 의해 형성되는 수평 전계는 이 부분의 액정을 반응시켜 다크(Dark)상태에서 광 누설현상이 발생되게 된다.In such liquid crystal display pixels, the electric field generated by the voltage difference between the data line 4 and the pixel electrode 6 is a cause of deterioration of the screen, as shown in Figs. In particular, when using a horizontal electric field such as a FFS (Fringe Field Switching) mode or an IPS (In Plane Switching) mode, the horizontal electric field formed by the pixel electrode 6 and the data line 4 reacts with liquid crystals of this part, thereby darkening. Light leakage occurs in this state.
도 2는 종래의 액정 표시장치의 측면을 나타내는 도면으로, 그 최하단에 유리기판이 형성되며, 그 상면에는 공통전극(2)이 형성되고, 그 공통전극(2)의 상면에는 게이트 절연막(8)이 형성된다. 그 게이트 절연막(8)의 상면에는 데이터 라인(4)이 중앙 소정부에 구비된 수지층(10)이 형성되며, 그 상면에는 일정 간격으로 픽셀전극(6)이 형성되는 바, 상기 픽셀 전극(6)과 데이터 라인(4)의 사이에는 수평전계가 형성되어 광누설 현상이 발생되게 된다.FIG. 2 is a view showing a side surface of a conventional liquid crystal display device, in which a glass substrate is formed at a lower end thereof, a common electrode 2 is formed on an upper surface thereof, and a gate insulating film 8 is formed on an upper surface of the common electrode 2. Is formed. On the upper surface of the gate insulating film 8, a resin layer 10 having a data line 4 provided at a central predetermined portion is formed, and pixel electrodes 6 are formed on the upper surface of the gate insulating film 8 at predetermined intervals. A horizontal electric field is formed between 6) and the data line 4 to cause a light leakage phenomenon.
현재, 이러한 전계효과를 방지하기 위하여 블랙 매트릭스(BM)의 폭 증가, 데이터 라인(4)과 픽셀 전극(6)과의 사이의 간격 증가, 전계 차단용 바(Bar)의 삽입 등 많은 시도가 이루어지고 있으나, 이러한 노력은 개구율(Aperture Ratio)을 감소시켜 패널의 휘도를 낮아지게 하는 원인이 되고 있다.At present, many attempts have been made to increase the width of the black matrix BM, increase the gap between the data line 4 and the pixel electrode 6, and insert a field blocking bar to prevent the electric field effect. However, such efforts have led to a decrease in the aperture ratio, thereby lowering the brightness of the panel.
본 발명은 상기한 종래 기술의 사정을 감안하여 이루어진 것으로, 픽셀 전극과 데이터 라인사이에 발생되는 전계의 수직방향으로 픽셀 전극과 공통 전극사이의 전계를 발생시킴으로 인해 데이터 라인의 부근의 액정 반응을 억제시키고 광이 누설되는 것을 방지할 수 있도록 한 광누출 방지를 위한 액정 표시장치를 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-described prior art, and suppresses liquid crystal reaction near the data line by generating an electric field between the pixel electrode and the common electrode in the vertical direction of the electric field generated between the pixel electrode and the data line. It is an object of the present invention to provide a liquid crystal display device for preventing light leakage, which can prevent the leakage of light.
도 1은 종래의 실시예에 따른 화소 전극 형성도를 나타내는 도면,1 is a diagram illustrating a pixel electrode formation diagram according to a conventional embodiment;
도 2는 종래의 실시예에 따른 데이터 라인 주위의 광누설 현상을 도시한 도면,2 is a diagram illustrating a light leakage phenomenon around a data line according to a conventional embodiment;
도 3a는 본 발명의 일실시예에 따른 광누출 방지를 위한 액정 표시장치를 적용한 상태의 전극형성도를 나타내는 도면,3A is a view illustrating an electrode formation diagram in a state where a liquid crystal display device for preventing light leakage according to an embodiment of the present invention is applied;
도 3b는 본 발명의 일실시예에 따른 광누출 방지를 위한 액정 표시장치를 도시한 도면이다.3B is a diagram illustrating a liquid crystal display for preventing light leakage according to an embodiment of the present invention.
*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
2,2':공통전극, 4:데이터라인,2,2 ': common electrode, 4: data line,
6,6':픽셀전극, 8:게이트절연막,6,6 ': pixel electrode, 8: gate insulating film,
10:수지.10: Resin.
상기한 목적을 달성하기 위해, 본 발명의 바람직한 실시예에 따르면 IPS 모드 및 FFS 모드와 같이 픽셀 전극의 하부에 전극이 형성되고 그 하부 전극과 픽셀 전극의 사이에 형성되는 수평 전계에 의한 액정의 변형 현상을 이용하는 디스플레이 소자에 있어서, 데이터 라인과 픽셀 전극사이에 전계를 감소시키기 위하여 픽셀 전극의 측면부를 '⊂' 형상으로 돌출시킴으로써 그 돌출부의 공통전극과 픽셀전극사이의 수직전계가 데이터 라인과 픽셀전극사이의 수평전극을 제한하여 각각의 전계가 감소될 수 있도록 한 것을 특징으로 하는 광누출 방지를 위한 액정 표시장치가 제공된다.In order to achieve the above object, according to a preferred embodiment of the present invention, the deformation of the liquid crystal by the horizontal electric field is formed between the lower electrode and the pixel electrode, the electrode is formed in the lower portion of the pixel electrode, such as IPS mode and FFS mode In a display device using a phenomenon, a vertical electric field between the common electrode and the pixel electrode of the protrusion is formed by protruding the side portion of the pixel electrode into a '⊂' shape in order to reduce the electric field between the data line and the pixel electrode. There is provided a liquid crystal display for preventing light leakage, characterized in that each electric field is reduced by limiting horizontal electrodes therebetween.
바람직하게, 상기 픽셀 전극의 측면부는 돌출모양의 다각형으로 형성된 것을 특징으로 하는 광누출 방지를 위한 액정 표시장치가 제공된다.Preferably, the liquid crystal display for preventing light leakage, characterized in that the side portion of the pixel electrode is formed in a protruding polygon.
이하, 본 발명에 대해 도면을 참조하여 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to drawings.
도 3a는 본 발명의 일실시예에 따른 광누출 방지를 위한 액정 표시장치를 적용한 상태의 전극형성도를 나타내는 도면이며, 도 3b는 본 발명의 일실시예에 따른 광누출 방지를 위한 액정 표시장치를 도시한 도면이다.3A is a view illustrating an electrode formation diagram in a state in which a liquid crystal display for preventing light leakage according to an embodiment of the present invention is applied, and FIG. 3B is a liquid crystal display for preventing light leakage according to an embodiment of the present invention. Figure is a diagram.
이를 참조하면, 액정 기형현상(Deformation)을 발생시키는 픽셀 전극(6')과 데이터 라인(4)사이의 수평 전계를 약화시키거나 제거하기 위해서 데이터 라인(4) 사이드(A)에 존재하는 예컨대, 원치 않는 액정의 변형에 직접적인 영향을 주는 픽셀 전극(6')을 '⊂'자 형상으로 형성시킴으로써, 상기 공통전극(2)과 픽셀 전극(6')사이에 형성되는 전계를 이용하여 상기 데이터 라인(4)과 픽셀 전극(6') 사이에 형성되는 전계를 차단시켜 이 영역에서 액정의 변형을 감소시킬 수 있다.Referring to this, for example, present at the side A of the data line 4 in order to weaken or eliminate the horizontal electric field between the pixel electrode 6 'and the data line 4 which causes liquid crystal deformation. The data line is formed by using an electric field formed between the common electrode 2 and the pixel electrode 6 'by forming a pixel electrode 6' that has a direct influence on the deformation of an undesired liquid crystal. The deformation of the liquid crystal in this region can be reduced by blocking the electric field formed between the (4) and the pixel electrode 6 '.
도 3a 및 3b에 도시된 바와 같이, 전극을 형성시킨다면 서로 수직인 방향의 전계가 발생되어 상기 픽셀 전극(6')과 데이터 라인(4)사이의 전계뿐 아니라 상기 공통 전극(2)과 데이터 라인(4)사이의 전계를 감소시킬 수 있다.As shown in FIGS. 3A and 3B, when the electrodes are formed, electric fields in directions perpendicular to each other are generated to generate not only an electric field between the pixel electrode 6 ′ and the data line 4 but also the common electrode 2 and the data line. The electric field between (4) can be reduced.
이러한 전계 차단효과는 액정의 변형을 감소시키고, 가능한 픽셀(6')과 데이터 라인(4)간의 간격을 감소시킬 수 있으므로 궁극적으로는 광누설을 방지할 수 있는 블랙 매트릭스(BM)의 폭을 감소시켜 개구율을 향상시킬 수 있게 된다.This field blocking effect can reduce the deformation of the liquid crystal and possibly reduce the distance between the pixel 6 'and the data line 4, ultimately reducing the width of the black matrix BM which can prevent light leakage. The aperture ratio can be improved.
본 발명의 다른 실시예로는 상기 픽셀 전극(6')과 데이터 라인(4)과의 사이에 전계를 감소시키기 위하여 돌출 모양의 삼각형 형상이나 다른 다각형 형상으로 픽셀 전극의 측면을 형성시킬 수 있다.In another embodiment of the present invention, the side of the pixel electrode may be formed in a triangular shape or another polygonal shape of the protruding shape so as to reduce the electric field between the pixel electrode 6 'and the data line 4.
상기한 구성의 본 발명의 일실시예에 따른 광누출 방지를 위한 액정 표시장치의 기능과 작용을 첨부된 도면을 참조하여 상세하게 설명한다.The function and operation of the liquid crystal display for preventing light leakage according to an embodiment of the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.
먼저, 상기 픽셀 전극(6')과 데이터 라인(4)사이의 수평 전계를 약화시키거나 제거하기 위해서 데이터 라인(4) 사이드(A)에 존재하는 픽셀 전극(6')을 '⊂'자 형상으로 형성시킴으로써, 상기 공통전극(2)과 픽셀 전극(6')사이에 형성되는 전계를 이용하여 상기 데이터 라인(4)과 픽셀 전극(6') 사이에 형성되는 전계를 차단시켜 이 영역에서 액정의 변형을 감소시킬 수 있다.First, in order to weaken or eliminate the horizontal electric field between the pixel electrode 6 'and the data line 4, the pixel electrode 6' existing on the side A of the data line 4 is shaped like a '⊂'. In the region by blocking the electric field formed between the data line 4 and the pixel electrode 6 'by using an electric field formed between the common electrode 2 and the pixel electrode 6'. It can reduce the deformation of.
즉, 상기 공통전극(2)과 픽셀 전극(6') 사이에서 발생되는 수직전계가 직접적으로 상기 데이터 라인(4)과 픽셀 전극(6') 사이에서 발생되는 수평전계에 영향을 주어 상기 픽셀 전극(6')과 데이터 라인(4)사이의 전계뿐 아니라 상기 공통 전극(2)과 데이터 라인(4)사이의 전계를 감소시킬 수 있게 된다.That is, the vertical electric field generated between the common electrode 2 and the pixel electrode 6 'directly affects the horizontal electric field generated between the data line 4 and the pixel electrode 6' and thus the pixel electrode. It is possible to reduce the electric field between the common electrode 2 and the data line 4 as well as the electric field between the 6 'and the data line 4.
한편, 본 발명의 실시예에 따른 광누출 방지를 위한 액정 표시장치는 단지 상기한 실시예에 한정되는 것이 아니라 그 기술적 요지를 이탈하지 않는 범위내에서 다양한 변경이 가능하다.Meanwhile, the liquid crystal display for preventing light leakage according to the embodiment of the present invention is not limited to the above-described embodiment, but various modifications can be made without departing from the technical gist of the present invention.
상기한 바와 같이, 본 발명에 따른 광누출 방지를 위한 액정 표시장치는 FFS 모드 등 수평전계를 이용하는 모드에 적용할 경우 데이터 라인과 픽셀 전극간의 전계에 의한 액정의 변형을 감소시켜 광누설을 방지할 수 있으며, 동시에 블랙 매트릭스의 폭을 감소시킬 수 있으므로 개구율을 향상시킬 수 있으며 고화질화를 추구할 수 있게 된다.As described above, the liquid crystal display for preventing light leakage according to the present invention can prevent the light leakage by reducing the deformation of the liquid crystal due to the electric field between the data line and the pixel electrode when applied to the mode using a horizontal electric field, such as FFS mode At the same time, it is possible to reduce the width of the black matrix, thereby improving the aperture ratio and pursuing higher image quality.
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| KR100789456B1 (en) * | 2005-11-29 | 2008-01-02 | 엘지.필립스 엘시디 주식회사 | In plane switching mode liquid crystal display device |
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