KR20120041457A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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KR20120041457A
KR20120041457A KR1020100102920A KR20100102920A KR20120041457A KR 20120041457 A KR20120041457 A KR 20120041457A KR 1020100102920 A KR1020100102920 A KR 1020100102920A KR 20100102920 A KR20100102920 A KR 20100102920A KR 20120041457 A KR20120041457 A KR 20120041457A
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South Korea
Prior art keywords
liquid crystal
crystal panel
circuit board
signal
power
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KR1020100102920A
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Korean (ko)
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KR101761407B1 (en
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우상욱
장동훈
제성민
이강진
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엘지디스플레이 주식회사
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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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13454—Drivers integrated on 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
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13456—Cell terminals located on one side of the display only
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13458—Terminal pads

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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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE: A liquid crystal display device is provided to supply a cascade type driving signal to a source driving unit and reduce the difference between driving voltages which are supplied to the source driving unit. CONSTITUTION: A plurality of source driving units are connected each other in a cascade type. A power unit(PWR) and a timing control unit(TCN) are formed on a PCB(Printed Circuit Board). First power lines(VL) connect the PCB to a liquid crystal panel(PNL). The first power lines supply a driving voltage to the liquid crystal panel. First signal lines(DCL) are formed on an FPCB(Flexible Printed Circuit Board). The first signal lines transmit the driving signal to the liquid crystal panel.

Description

액정표시장치{Liquid Crystal Display Device}[0001] The present invention relates to a liquid crystal display device,

본 발명의 실시예는 액정표시장치에 관한 것이다.An embodiment of the present invention relates to a liquid crystal display device.

최근, 평판표시장치(FPD: Flat Panel Display)는 멀티미디어의 발달과 함께 그 중요성이 증대되고 있다. 이에 부응하여 액정표시장치, 플라즈마 표시장치, 유기전계발광표시장치 등과 같은 여러 가지의 평면형 표시장치가 실용화되고 있다. 이들 중 일부 표시장치 예컨대, 액정표시장치 및 유기전계발광표시장치는 증착 방법, 식각 방법 등을 통해 기판 상에 소자들과 배선들을 박막 형태로 형성한다.2. Description of the Related Art In recent years, the importance of flat panel displays (FPDs) has been increasing with the development of multimedia. In response to this, various flat panel display devices such as liquid crystal display devices, plasma display devices, organic light emitting display devices, and the like have been put into practical use. Some of these displays, for example, liquid crystal displays and organic light emitting displays, form elements and wires in a thin film form on a substrate through a deposition method, an etching method, or the like.

액정표시장치의 구동원리는 액정의 광학적 이방성과 분극성질을 이용한다. 액정은 구조가 가늘고 길기 때문에 분자의 배열에 방향성을 지니고 있다. 액정에 인위적으로 전기장을 인가하면 분자배열의 방향을 제어할 수 있게 된다. 따라서, 액정표시장치의 경우, 액정의 분자배열 방향을 임의로 조절하면 액정의 분자배열이 변하게 되고 광학적 이방성에 의해 액정의 분자배열 방향으로 빛이 굴절하여 화상정보를 표현할 수 있게 된다.The driving principle of the liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. Liquid crystals are thin and long in structure and thus have an orientation in the arrangement of molecules. By artificially applying an electric field to the liquid crystal, it is possible to control the direction of the molecular arrangement. Therefore, in the case of the liquid crystal display device, if the molecular arrangement direction of the liquid crystal is arbitrarily changed, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal due to optical anisotropy to express image information.

액정표시장치의 경우, 저전력 소비의 시리얼 인터페이스를 구현과 보다 콤팩트한 설계를 위해 액정패널에 데이터신호를 공급하는 소스구동부를 캐스케이드 형태로 연결한 시리얼 전송방법이 제안되어 왔다.In the case of a liquid crystal display, a serial transmission method in which a cascade form of a source driver for supplying a data signal to a liquid crystal panel has been proposed for implementing a low power consumption serial interface and a more compact design.

그런데, 종래 캐스케이드 방식으로 구현된 액정표시장치는 액정패널 상에 형성된 배선을 이용하여 소스구동부에 구동전압을 공급하기 때문에 소스구동부 간의 전압 편차가 발생하고 이로 인해 소스 딤(source dim)이나 화면 노이즈(noise) 등과 같은 문제가 발생하고 있어 이의 개선이 요구된다. 또한, 캐스게이트 방식이 아닌 일반적인 액정표시장치의 경우 연성회로기판을 통해 소스구동부에 구동신호나 구동전압을 공급하기 때문에 각 배선들이 연성회로기판 상에 형성되어야 하므로 연성회로기판의 크기가 증가하는 문제가 있었다.
However, since the liquid crystal display device implemented by the conventional cascade method supplies the driving voltage to the source driver by using the wiring formed on the liquid crystal panel, a voltage deviation occurs between the source driver, which causes source dim or screen noise ( There is a problem such as noise) and improvement thereof is required. In addition, in the case of a general liquid crystal display device which is not a casgate type, since the driving signals or the driving voltage are supplied to the source driver through the flexible circuit board, each wiring must be formed on the flexible circuit board, thereby increasing the size of the flexible circuit board. There was.

상술한 배경기술의 문제점을 해결하기 위한 본 발명의 실시예는, 소스구동부에 캐스케이드 방식으로 구동신호를 전달하고 소스구동부에 공급되는 구동전압의 편차를 개선하여 표시품질을 향상시킴과 더불어 연성회로기판의 크기를 축소할 수 있는 액정표시장치를 제공하는 것이다.
Embodiments of the present invention to solve the above-described problems of the present invention, by transmitting a drive signal in the cascade method to the source driver, and improves the display quality by improving the deviation of the drive voltage supplied to the source driver to the flexible circuit board It is to provide a liquid crystal display device that can reduce the size of the.

상술한 과제 해결 수단으로 본 발명의 실시예는, 액정패널; 액정패널의 일측에 형성되며 캐스케이드 형태로 연결된 다수의 소스구동부; 액정패널의 타측에 형성된 적어도 하나의 게이트구동부; 구동전압을 출력하는 전원부와 구동신호를 출력하는 타이밍제어부가 형성된 인쇄회로기판; 및 인쇄회로기판과 액정패널을 연결하며 구동전압을 액정패널에 전달하는 제1전원배선들과, 구동신호를 액정패널에 전달하는 제1신호배선들이 형성된 연성회로기판을 포함하되, 제1전원배선들은, 액정패널에 형성된 다수의 소스구동부의 개수에 대응하여 연성회로기판 상에 분리된 것을 특징으로 하는 액정표시장치를 제공한다.Embodiments of the present invention as a means for solving the above problems, the liquid crystal panel; A plurality of source drivers formed on one side of the liquid crystal panel and connected in a cascade form; At least one gate driver formed on the other side of the liquid crystal panel; A printed circuit board having a power supply unit for outputting a driving voltage and a timing control unit for outputting a driving signal; And a flexible circuit board connecting the printed circuit board and the liquid crystal panel, the first power wirings for transmitting a driving voltage to the liquid crystal panel, and the first signal wirings for driving a driving signal to the liquid crystal panel. The present invention provides a liquid crystal display device which is separated on a flexible circuit board in correspondence with the number of source driving parts formed in the liquid crystal panel.

제1전원배선들은, 전원부로부터 출력된 구동전압을 전달받는 하나의 메인배선과, 다수의 소스구동부의 개수에 대응하는 다수의 서브배선들을 포함할 수 있다.The first power wirings may include one main wiring receiving the driving voltage output from the power supply unit, and a plurality of sub wirings corresponding to the number of source driving units.

다수의 서브배선들은, 액정패널과 부착되는 콘택영역에서 다수의 배선들로 분리 형성될 수 있다.The plurality of sub-wirings may be formed by separating the plurality of wirings in the contact region attached to the liquid crystal panel.

콘택영역에 위치하는 다수의 배선들의 선 폭은, 다수의 서브배선들의 선 폭보다 좁게 형성될 수 있다.The line width of the plurality of wires positioned in the contact region may be smaller than the line width of the plurality of sub wires.

제1전원배선들의 선 폭은, 액정패널에 형성된 제2전원배선들의 선 폭보다 넓게 형성될 수 있다.The line width of the first power lines may be wider than the line width of the second power lines formed in the liquid crystal panel.

액정패널은, 제1신호배선들에 연결되며 다수의 소스구동부를 캐스케이드 형태로 연결하는 제2신호배선들을 포함하며, 구동신호는, 제2신호배선들을 통해 다수의 소스구동부 중 제1내지 제N소스구동부에 순차적으로 전달될 수 있다.The liquid crystal panel includes second signal wires connected to the first signal wires and connected to the plurality of source drive units in a cascade form, and the driving signal is the first to Nth of the plurality of source drive units through the second signal wires. It may be sequentially delivered to the source driver.

제1신호배선들은, 연성회로기판 상에서 제1전원배선들 보다 외측에 형성될 수 있다.
The first signal wires may be formed outside the first power wires on the flexible circuit board.

본 발명의 실시예는, 소스구동부에 캐스케이드 방식으로 구동신호를 전달하고 소스구동부에 공급되는 구동전압의 편차를 개선하여 표시품질을 향상시킴과 더불어 연성회로기판의 크기를 축소할 수 있는 액정표시장치를 제공하는 효과가 있다. 또한, 본 발명의 실시예는 연성회로기판의 크기를 축소할 수 있어 액정표시장치 제작시 원가를 절감할 수 있는 효과가 있다.
According to an exemplary embodiment of the present invention, a liquid crystal display device which transmits a driving signal in a cascade manner to a source driver, improves display quality by improving a variation in driving voltage supplied to a source driver, and reduces the size of a flexible circuit board. Has the effect of providing. In addition, the embodiment of the present invention can reduce the size of the flexible circuit board has the effect of reducing the cost when manufacturing the liquid crystal display device.

도 1은 액정표시장치에 대해 개략적으로 설명하기 위한 블록도.
도 2는 소스구동부의 캐스케이드 접속 관계를 설명하기 위한 도면.
도 3은 본 발명의 일 실시예에 따른 액정표시장치의 개략적인 구성도.
도 4는 도 3의 일부를 자세히 나타낸 확대도.1 is a block diagram schematically illustrating a liquid crystal display device.
2 is a diagram for explaining a cascade connection relationship of a source driver.
3 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention.
4 is an enlarged view showing a portion of FIG. 3 in detail;

이하, 본 발명의 실시를 위한 구체적인 내용을 첨부된 도면을 참조하여 설명한다.Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

도 1은 액정표시장치에 대해 개략적으로 설명하기 위한 블록도 이고, 도 2는 소스구동부의 캐스케이드 접속 관계를 설명하기 위한 도면이다.FIG. 1 is a block diagram for schematically describing a liquid crystal display, and FIG. 2 is a diagram for describing a cascade connection relationship of a source driver.

도 1에 도시된 바와 같이, 액정표시장치에는 액정패널(PNL), 액정패널(PNL)의 데이터배선들(D1~Dm)에 접속된 소스구동부(SD-IC), 액정패널(PNL)의 게이트배선들(G1~Gn)에 접속된 게이트구동부(GD-IC), 소스구동부(SD-IC)와 게이트구동부(GD-IC)를 제어하기 위한 타이밍제어부(TCN) 및 전원을 생성하는 전원부(PWR)가 포함된다.As shown in FIG. 1, the liquid crystal display device includes a liquid crystal panel PNL, a source driver SD-IC connected to data lines D1 to Dm of the liquid crystal panel PNL, and a gate of the liquid crystal panel PNL. The gate driver GD-IC connected to the wirings G1 to Gn, the timing driver TCN for controlling the source driver SD-IC and the gate driver GD-IC, and the power supply PWR for generating power. ) Is included.

액정패널(PNL)은 액정층을 사이에 두고 합착된 박막 트랜지스터기판과 컬러필터기판을 포함한다. 박막 트랜지스터기판의 화소 어레이에는 데이터배선들(D1~Dm)과 게이트배선들(G1~Gn)의 교차부마다 형성되는 박막 트랜지스터들과 박막 트랜지스터들에 접속된 화소전극들을 포함한다. 화소 어레이에 포함된 하나의 서브 픽셀은 도시된 바와 같이, 제m-2번째 데이터라인(Dm-2)과 제n-2번째 게이트라인(Gn-2)의 교차부에 형성된 박막 트랜지스터(이하 TFT)와, TFT를 통해 데이터전압을 충전하는 스토리지 커패시터(Cst)와, 데이터전압에 의해 액정셀(Clc)를 구동하는 화소전극(1) 및 공통전극(2)과, 공통전극(2)에 공통전압을 공급하는 공통전압배선(Vcom)을 포함한다. 이러한 구조를 갖는 서브 픽셀은 백라이트 유닛(BLU)으로부터 입사되는 빛의 투과양을 액정셀(Clc)로 조절하여 비디오 데이터의 화상을 표시한다. 컬러필터기판 상에는 블랙매트릭스층, 컬러필터층 및 공통전극이 형성된다. 다만, 공통전극은 구동 방식에 따라 박막 트랜지스터기판 또는 컬러필터기판에 구분되어 형성된다. 액정패널(PNL)의 박막 트랜지스터기판과 컬러필터기판에는 각각 편광판이 부착되고 액정의 프리틸트각(pre-tilt angle)을 설정하기 위한 배향막이 형성된다.The liquid crystal panel PNL includes a thin film transistor substrate and a color filter substrate bonded together with a liquid crystal layer interposed therebetween. The pixel array of the thin film transistor substrate includes thin film transistors formed at intersections of the data lines D1 to Dm and the gate lines G1 to Gn, and pixel electrodes connected to the thin film transistors. As illustrated, one subpixel included in the pixel array is a thin film transistor (hereinafter, referred to as TFT) formed at the intersection of the m-second data line Dm-2 and the n-second gate line Gn-2. ), The storage capacitor Cst for charging the data voltage through the TFT, the pixel electrode 1 and the common electrode 2 for driving the liquid crystal cell Clc by the data voltage, and the common electrode 2. It includes a common voltage wiring (Vcom) for supplying a voltage. The sub-pixel having such a structure displays an image of video data by adjusting the transmission amount of light incident from the backlight unit BLU to the liquid crystal cell Clc. The black matrix layer, the color filter layer and the common electrode are formed on the color filter substrate. However, the common electrode is formed on the thin film transistor substrate or the color filter substrate according to the driving method. Polarizing plates are attached to the thin film transistor substrate and the color filter substrate of the liquid crystal panel PNL, respectively, and an alignment layer for setting the pre-tilt angle of the liquid crystal is formed.

타이밍제어부(TCN)는 LVDS 인터페이스, TMDS 인터페이스 등의 인터페이스 수신회로를 통해 시스템보드로부터 예컨대, RGB 디지털 비디오 데이터, 수직 동기신호(Vsync), 수평 동기신호(Hsync), 데이터 인에이블 신호(Data Enable, DE), 도트 클럭(CLK) 등의 타이밍신호와 같은 시스템신호를 입력받는다. 타이밍제어부(TCN)는 타이밍신호(Vsync, Hsync, DE, CLK)를 이용하여 소스구동부(SD-IC)를 제어하기 위한 데이터 제어신호(SSC, SOE, POL)와 게이트구동부(GD-IC)의 동작 타이밍을 제어하기 위한 게이트 타이밍 제어신호(GSP, GSC, GOE) 등을 포함하는 구동신호를 발생한다.The timing controller TCN is configured to receive, for example, RGB digital video data, a vertical sync signal Vsync, a horizontal sync signal Hsync, and a data enable signal from a system board through an interface receiving circuit such as an LVDS interface or a TMDS interface. A system signal such as a timing signal such as DE) or dot clock CLK is input. The timing controller TCN includes the data control signals SSC, SOE, and POL and the gate driver GD-IC for controlling the source driver SD-IC using the timing signals Vsync, Hsync, DE, and CLK. A driving signal including gate timing control signals GSP, GSC, and GOE for controlling the operation timing is generated.

전원부(PWR)는 외부로부터 공급되는 전압(Vin)을 조정하여 구동전압으로 생성하고 생성된 구동전압을 타이밍제어부(TCN), 소스구동부(SD-IC), 게이트구동부(GD-IC) 및 액정패널(PNL) 중 어느 하나 이상에 공급한다. 전원부(PWR)로부터 생성된 구동전압에는 전원전압(Vdd), 로직 전원전압(Vcc), 게이트 하이전압(VGH), 게이트 로우전압(VGL), 공통전압(Vcom), 정극성/부극성 감마기준전압들(VGMA1?VGMA10) 등을 포함하는 제1구동전압(DVDD), 제2구동전압(AVDD) 및 제3구동전압(REF)이 포함된다.The power supply unit PWR generates a driving voltage by adjusting a voltage Vin supplied from the outside, and generates the generated driving voltage as a timing controller TCN, a source driver SD-IC, a gate driver GD-IC, and a liquid crystal panel. To one or more of (PNL). The driving voltage generated from the power supply unit PWR includes a power supply voltage Vdd, a logic power supply voltage Vcc, a gate high voltage V GH , a gate low voltage V GL , a common voltage Vcom, and a positive / negative polarity. gamma reference voltages (V GMA1? V GMA10) include a first driving voltage (DVDD), the second driving voltage (AVDD), and a third drive voltage (REF), or the like.

소스구동부(SD-IC)는 타이밍제어부(TCN)로부터의 mini LVDS 인터페이스 규격의 R,G,B 데이터와 mini LVDS 클럭에 따라 RGB 디지털 비디오 데이터(RGB)를 샘플링하고 래치하여 병렬 데이터 체계의 데이터로 변환한다. 소스구동부(SD-IC)는 병렬 데이터 전송 체계로 변환된 디지털 비디오 데이터를 극성제어신호(POL)에 응답하여 정극성/부극성 감마기준전압들을 이용하여 액정셀들에 충전될 정극성/부극성 아날로그 비디오 데이터전압으로 변환한 다음, 타이밍제어부(TCN)로부터의 소스 출력 인에이블(SOE)에 응답하여 데이터배선들(D1~Dm)에 공급한다.The source driver (SD-IC) samples and latches RGB digital video data (RGB) according to the R, G, B data of the mini LVDS interface standard and the mini LVDS clock from the timing controller (TCN) to the data of the parallel data system. Convert. The source driver SD-IC uses the positive / negative gamma reference voltages to convert the digital video data converted by the parallel data transmission scheme into the positive / negative polarity to be charged in the liquid crystal cells. After the conversion to the analog video data voltage, it is supplied to the data lines D1 to Dm in response to the source output enable SOE from the timing controller TCN.

게이트구동부(GD-IC)는 타이밍제어부(TCN)로부터의 게이트 타이밍 제어신호(GSP, GSC, GOE)에 응답하여 게이트 구동전압을 순차적으로 쉬프트하는 쉬프트 레지스터를 포함하여 게이트배선들(G1~Gn)에 게이트펄스(또는 스캔펄스)를 순차적으로 공급한다.The gate driver GD-IC includes a shift register that sequentially shifts the gate driving voltage in response to the gate timing control signals GSP, GSC, and GOE from the timing controller TCN. Gate pulses (or scan pulses) are supplied sequentially.

앞서 설명한 바와 같은 액정표시장치는 소스구동부(SD-IC)로 인가되는 전압의 편차를 줄이기 위해 도 2와 같이 다수의 소스구동부(SD-IC1~SD-ICn)를 캐스케이스 형태로 접속한다. 그리고 타이밍제어부(TCN) 및 전원부(PWR)로부터 출력된 구동신호 및 구동전압은 최대한 연성회로기판(FPC)을 통해 액정패널(PNL)에 전달되도록 배선한다. 실시예는 구동신호 및 구동전압이 최대한 연성회로기판(FPC)에 형성된 제1신호배선들(DCL) 및 제1전원배선들(VL)을 통해 액정패널(PNL)에 전달되도록 배선을 형성하여 배선 저항에 의한 전압 강하(drop)를 방지한다.As described above, the liquid crystal display device connects the plurality of source drivers SD-IC1 to SD-ICn in a casing form to reduce the variation in voltage applied to the source driver SD-IC. In addition, the driving signal and the driving voltage output from the timing controller TCN and the power supply unit PWR are routed to the liquid crystal panel PNL through the flexible printed circuit board FPC as much as possible. In an embodiment, the wiring is formed such that the driving signal and the driving voltage are transferred to the liquid crystal panel PNL through the first signal wirings DCL and the first power wirings VL formed on the flexible printed circuit board FPC as much as possible. Prevents voltage drop by resistors.

이하, 본 발명의 일 실시예에 따른 액정표시장치에 대해 더욱 자세히 설명한다.Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described in more detail.

도 3은 본 발명의 일 실시예에 따른 액정표시장치의 개략적인 구성도이고, 도 4는 도 3의 일부를 자세히 나타낸 확대도 이다.3 is a schematic configuration diagram of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 4 is an enlarged view showing a part of FIG. 3 in detail.

도 3 및 도 4에 도시된 바와 같이, 액정패널(PNL)에는 영상을 표시하는 유효 화면인 액티브영역(A/A)이 정의된다. 그리고 액정패널(PNL)의 일측에는 캐스케이드 형태로 연결된 다수의 소스구동부(SD-IC1~SD-IC4)가 형성된다. 그리고 액정패널(PNL)의 타측에는 적어도 하나의 게이트구동부(GD-IC)가 형성된다.3 and 4, the active area A / A, which is an effective screen displaying an image, is defined in the liquid crystal panel PNL. In addition, a plurality of source driving units SD-IC1 to SD-IC4 connected in a cascade form are formed at one side of the liquid crystal panel PNL. At least one gate driver GD-IC is formed on the other side of the liquid crystal panel PNL.

액정패널(PNL)에는 제1신호배선들(DCL)에 연결되며 다수의 소스구동부(SD-IC1~SD-IC4)를 캐스케이드 형태로 연결하는 제2신호배선들(DCLP)이 형성된다. 이에 따라, 제1신호배선들(DCL)을 통해 흐르는 구동신호(S)는 제2신호배선들(DCLP)을 통해 제1 내지 제4소스구동부(SD-IC1~SD-IC4)에 순차적으로 전달된다.The second signal lines DCLP are connected to the first signal lines DCL and connect the plurality of source drivers SD-IC1 to SD-IC4 in a cascade form to the liquid crystal panel PNL. Accordingly, the driving signal S flowing through the first signal wires DCL is sequentially transmitted to the first to fourth source drivers SD-IC1 to SD-IC4 through the second signal wires DCLP. do.

액정패널(PNL)의 일측 외곽에는 연성회로기판(FPC)이 부착된다. 액정패널(PNL)과 연성회로기판(FPC)은 이방성도전볼(ACF)에 의해 전기적으로 연결될 수 있으나 이에 한정되지 않는다. 연성회로기판(FPC)에는 구동전압을 액정패널(PNL)에 전달하는 제1전원배선들(VL)과, 구동신호를 액정패널(PNL)에 전달하는 제1신호배선들(DCL)이 형성된다. 연성회로기판(FPC)은 인쇄회로기판(PCB)과 액정패널(PNL)을 연결하며 구동전압과 구동신호를 액정패널(PNL)에 전달하는 역할을 한다. 제1신호배선들(DCL)은 연성회로기판(FPC) 상에서 제1전원배선들(VL) 보다 외측에 위치하도록 형성될 수 있으나 이에 한정되지 않는다.A flexible circuit board FPC is attached to one outer side of the liquid crystal panel PNL. The liquid crystal panel PNL and the flexible circuit board FPC may be electrically connected by an anisotropic conductive ball ACF, but are not limited thereto. First flexible wirings VL for transmitting a driving voltage to the liquid crystal panel PNL and first signal wirings DCL for transmitting a driving signal to the liquid crystal panel PNL are formed on the flexible circuit board FPC. . The flexible printed circuit board (FPC) connects the printed circuit board (PCB) and the liquid crystal panel (PNL) and transmits a driving voltage and a driving signal to the liquid crystal panel (PNL). The first signal wires DCL may be formed to be located outside the first power wires VL on the flexible printed circuit board FPC, but the present invention is not limited thereto.

연성회로기판(FPC)의 일측 외곽에는 인쇄회로기판(PCB)이 부착된다. 연성회로기판(FPC)과 인쇄회로기판(PCB)은 이방성도전볼(ACF)에 의해 전기적으로 연결될 수 있으나 이에 한정되지 않는다. 인쇄회로기판(PCB)에는 구동전압을 출력하는 전원부(PWR)와 구동신호를 출력하는 타이밍제어부(TCN)가 형성된다.One side of the flexible printed circuit board (FPC) is attached to the printed circuit board (PCB). The flexible printed circuit board (FPC) and the printed circuit board (PCB) may be electrically connected by an anisotropic conductive ball (ACF), but is not limited thereto. The printed circuit board PCB includes a power supply unit PWR for outputting a driving voltage and a timing control unit TCN for outputting a driving signal.

한편, 실시예에 따라 연성회로기판(FPC) 상에 형성된 제1전원배선들(VL)은 액정패널(PNL)에 형성된 다수의 소스구동부(SD-IC1~SD-IC4)의 개수에 대응하여 연성회로기판(FPC) 상에 분리되어 형성된다.Meanwhile, according to an exemplary embodiment, the first power lines VL formed on the flexible printed circuit board FPC may be flexible to correspond to the number of source drivers SD-IC1 to SD-IC4 formed on the liquid crystal panel PNL. It is formed separately on the circuit board (FPC).

이를 위해, 제1전원배선들(VL)은 전원부(PWR)로부터 출력된 구동전압을 전달받는 하나의 메인배선(VLM)과, 다수의 소스구동부(SD-IC1~SD-IC4)의 개수에 대응하여 분리된 다수의 서브배선들(VLS)로 구분되어 연성회로기판(FPC) 상에 형성된다. 와 더불어, 다수의 서브배선들(VLS)은 액정패널(PNL)과 부착되는 콘택영역(CA)에서 다수의 배선들(VLX)로 분리 형성된다. 그리고 콘택영역(CA)에 위치하는 다수의 배선들(VLX)의 선 폭은 다수의 서브배선들(VLS)의 선 폭보다 좁게 형성될 수 있다. 위와 같이 제1전원배선들(VL)을 형성하는 이유는 전원부(PWR)로부터 출력된 구동전압을 최대한 넓은 선 폭을 통해 콘택영역(CA)과 인접한 영역까지 전달하기 위함이다. 그러므로, 제1전원배선들(VL)의 선 폭은 액정패널(PNL)에 형성된 제2전원배선들(VLP)의 선 폭보다 넓게 형성된다. 다만, 연성회로기판(FPC)과 액정패널(PNL)에 형성된 배선들이 상호 접속되는 콘택영역(CA)에 위치하는 배선의 선 폭과 개수는 상호 대응된다.To this end, the first power lines VL correspond to the number of one main line VLM receiving the driving voltage output from the power supply unit PWR and the number of source driving units SD-IC1 to SD-IC4. It is divided into a plurality of sub-wiring (VLS) is formed on the flexible printed circuit board (FPC). In addition, the plurality of sub-wiring lines VLS are separated from the plurality of wirings VLX in the contact area CA attached to the liquid crystal panel PNL. The line widths of the plurality of wires VLX positioned in the contact area CA may be smaller than the line widths of the plurality of sub wires VLS. The reason why the first power lines VL are formed as described above is to transfer the driving voltage output from the power supply unit PWR to the area adjacent to the contact area CA through the widest possible line width. Therefore, the line width of the first power lines VL is wider than the line width of the second power lines VLP formed on the liquid crystal panel PNL. However, the line width and the number of wires in the contact area CA where the wires formed on the flexible printed circuit board FPC and the liquid crystal panel PNL are connected to each other correspond to each other.

실시예와 같이, 제1전원배선들(VL)이 연성회로기판(FPC) 상에서 분리되어 각 소스구동부(SD-IC1~SD-IC4)에 접속되면 전압이 강하(drop) 되는 문제를 개선할 수 있게 된다. 그 이유는 연성회로기판(FPC) 상에 형성된 제1전원배선들(VL)의 경우, 통상적으로 구리(Cu) 등과 같이 전도성이 우수한 재료로 형성되므로 액정패널(PNL)에 형성된 제2전원배선들(VLP)보다 저항이 낮기 때문에 액정패널(PNL)에 형성된 제2전원배선들(DCLP)을 통해 구동전압을 전달하는 구조 대비 구동전압이 강하되는 문제를 개선할 수 있게 된다.
As in the embodiment, when the first power lines VL are separated on the flexible circuit board FPC and connected to each of the source drivers SD-IC1 to SD-IC4, the voltage drop can be improved. Will be. The reason is that in the case of the first power wirings VL formed on the flexible printed circuit board FPC, the second power wirings formed in the liquid crystal panel PNL because the first power wirings VL are formed of a material having excellent conductivity, such as copper (Cu). Since the resistance is lower than that of VLP, it is possible to improve the problem that the driving voltage drops compared to the structure of transferring the driving voltage through the second power wirings DCLP formed in the liquid crystal panel PNL.

이상 본 발명의 실시예는 소스구동부에 캐스케이드 방식으로 구동신호를 전달하고 소스구동부에 공급되는 구동전압의 편차를 개선하여 표시품질을 향상시킴과 더불어 연성회로기판의 크기를 축소할 수 있는 액정표시장치를 제공하는 효과가 있다. 또한, 본 발명의 실시예는 연성회로기판의 크기를 축소할 수 있어 액정표시장치 제작시 원가를 절감할 수 있는 효과가 있다.Embodiments of the present invention provide a liquid crystal display device which transmits a driving signal in a cascade manner to a source driver, improves display quality by improving a variation in driving voltage supplied to a source driver, and reduces the size of a flexible circuit board. Has the effect of providing. In addition, the embodiment of the present invention can reduce the size of the flexible circuit board has the effect of reducing the cost when manufacturing the liquid crystal display device.

이상 첨부된 도면을 참조하여 본 발명의 실시예를 설명하였지만, 상술한 본 발명의 기술적 구성은 본 발명이 속하는 기술 분야의 당업자가 본 발명의 그 기술적 사상이나 필수적 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 그러므로 이상에서 기술한 실시 예들은 모든 면에서 예시적인 것이며 한정적인 것이 아닌 것으로서 이해되어야 한다. 아울러, 본 발명의 범위는 상기 상세한 설명보다는 후술하는 특허청구범위에 의하여 나타내어진다. 또한, 특허청구범위의 의미 및 범위 그리고 그 등가 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

PNL: 액정패널 TCN: 타이밍제어부
PWR: 전원부 FPC: 연성회로기판
PCB: 인쇄회로기판 DCL: 제1신호배선들
DCLP: 제2신호배선들 VL: 제1전원배선들
VLP: 제2전원배선들 VLM: 메인배선
VLS: 다수의 서브배선들PNL: LCD Panel TCN: Timing Control Unit
PWR: Power Supply FPC: Flexible Circuit Board
PCB: Printed Circuit Board DCL: First Signal Wiring
DCLP: Second Signal Wirings VL: First Power Wirings
VLP: Secondary Power Wirings VLM: Main Wiring
VLS: Multiple Subwires

Claims (7)

액정패널;
상기 액정패널의 일측에 형성되며 캐스케이드 형태로 연결된 다수의 소스구동부;
상기 액정패널의 타측에 형성된 적어도 하나의 게이트구동부;
구동전압을 출력하는 전원부와 구동신호를 출력하는 타이밍제어부가 형성된 인쇄회로기판; 및
상기 인쇄회로기판과 상기 액정패널을 연결하며 상기 구동전압을 상기 액정패널에 전달하는 제1전원배선들과, 상기 구동신호를 상기 액정패널에 전달하는 제1신호배선들이 형성된 연성회로기판을 포함하되,
상기 제1전원배선들은,
상기 액정패널에 형성된 상기 다수의 소스구동부의 개수에 대응하여 상기 연성회로기판 상에 분리된 것을 특징으로 하는 액정표시장치.A liquid crystal panel;
A plurality of source drivers formed on one side of the liquid crystal panel and connected in a cascade form;
At least one gate driver formed on the other side of the liquid crystal panel;
A printed circuit board having a power supply unit for outputting a driving voltage and a timing control unit for outputting a driving signal; And
And a flexible circuit board connecting the printed circuit board and the liquid crystal panel, the first power wirings for transmitting the driving voltage to the liquid crystal panel, and the first signal wirings for transmitting the driving signal to the liquid crystal panel. ,
The first power wirings,
And a plurality of source driver portions separated on the flexible circuit board in correspondence with the number of the source driving parts formed in the liquid crystal panel. 제1항에 있어서,
상기 제1전원배선들은,
상기 전원부로부터 출력된 구동전압을 전달받는 하나의 메인배선과,
상기 다수의 소스구동부의 개수에 대응하는 다수의 서브배선들을 포함하는 액정표시장치.The method of claim 1,
The first power wirings,
One main wiring receiving the driving voltage outputted from the power supply unit;
And a plurality of sub wirings corresponding to the number of the plurality of source drivers. 제2항에 있어서,
상기 다수의 서브배선들은,
상기 액정패널과 부착되는 콘택영역에서 다수의 배선들로 분리 형성된 것을 특징으로 하는 액정표시장치.The method of claim 2,
The plurality of sub-wiring,
And a plurality of wires separated from the contact area attached to the liquid crystal panel. 제3항에 있어서,
상기 콘택영역에 위치하는 상기 다수의 배선들의 선 폭은,
상기 다수의 서브배선들의 선 폭보다 좁게 형성된 것을 특징으로 하는 액정표시장치.The method of claim 3,
The line width of the plurality of wires positioned in the contact area is
And a narrower than a line width of the plurality of sub-wiring lines. 제1항에 있어서,
상기 제1전원배선들의 선 폭은,
상기 액정패널에 형성된 제2전원배선들의 선 폭보다 넓게 형성된 것을 특징으로 하는 액정표시장치.The method of claim 1,
The line width of the first power wires is,
And a line width wider than a line width of second power lines formed in the liquid crystal panel. 제1항에 있어서,
상기 액정패널은,
상기 제1신호배선들에 연결되며 상기 다수의 소스구동부를 캐스케이드 형태로 연결하는 제2신호배선들을 포함하며,
상기 구동신호는,
상기 제2신호배선들을 통해 상기 다수의 소스구동부 중 제1내지 제N소스구동부에 순차적으로 전달되는 것을 특징으로 하는 액정표시장치.The method of claim 1,
The liquid crystal panel,
Second signal wires connected to the first signal wires and connected to the plurality of source drivers in a cascade form;
The drive signal is,
The liquid crystal display of claim 1, wherein the second signal lines are sequentially transmitted to first to Nth source drivers of the plurality of source drivers. 제1항에 있어서,
상기 제1신호배선들은,
상기 연성회로기판 상에서 상기 제1전원배선들 보다 외측에 형성된 것을 특징으로 하는 액정표시장치.The method of claim 1,
The first signal wires,
And an outer side of the first power line on the flexible circuit board.
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KR20150074469A (en) * 2013-12-24 2015-07-02 엘지디스플레이 주식회사 Image display device and mathod for manufacturing the same
KR20200020388A (en) * 2018-08-17 2020-02-26 엘지디스플레이 주식회사 Display device

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JP2004354567A (en) * 2003-05-28 2004-12-16 Advanced Display Inc Display device
KR100855995B1 (en) 2007-05-23 2008-09-02 삼성전자주식회사 Apparatus and method for driving display panel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150074469A (en) * 2013-12-24 2015-07-02 엘지디스플레이 주식회사 Image display device and mathod for manufacturing the same
KR20200020388A (en) * 2018-08-17 2020-02-26 엘지디스플레이 주식회사 Display device

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