CN1953030B - 控制电路装置和采用该控制电路装置的液晶显示器 - Google Patents

控制电路装置和采用该控制电路装置的液晶显示器 Download PDF

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CN1953030B
CN1953030B CN200510100562A CN200510100562A CN1953030B CN 1953030 B CN1953030 B CN 1953030B CN 200510100562 A CN200510100562 A CN 200510100562A CN 200510100562 A CN200510100562 A CN 200510100562A CN 1953030 B CN1953030 B CN 1953030B
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data driving
chip
driving chip
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CN1953030A (zh
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吴锡尧
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Innocom Technology Shenzhen Co Ltd
Innolux Shenzhen Co Ltd
Innolux Corp
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Innolux Shenzhen Co Ltd
Innolux Display Corp
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    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
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Abstract

本发明涉及一种控制电路装置，用于控制液晶显示面板的显示，其包括一主控电路板、一栅极驱动芯片和一数据驱动芯片，该主控电路板与该栅极驱动芯片和该数据驱动芯片相连，该栅极驱动芯片和该数据驱动芯片之一包括一电压侦测电路，该电压侦测电路提供一栅极全开信号给该栅极驱动芯片。本发明的控制电路装置可节省主控电路板空间。本发明还提供一种采用该控制电路装置的液晶显示器。

Description

控制电路装置和采用该控制电路装置的液晶显示器
【技术领域】
本发明涉及一种控制电路装置和采用该控制电路装置的液晶显示器。
【背景技术】
目前，在液晶显示器和相关产品中，对每个像素电极都会相应设置一存储电容，用于保持该像素电极电压。当液晶显示器关机时，由于薄膜晶体管处于关闭状态，存储电容中会有大量的电荷无法及时释放，而只能以漏电流的形式从该薄膜晶体管释放，进而产生关机后显示屏上有残留影像，即关机残影现象。
为消除关机残影现象，通常在液晶显示器电路设计时，会在该液晶显示器的栅极驱动器上设置一栅极全开功能，当该液晶显示器关机时，由主控电路提供一栅极全开信号给该栅极驱动器，使该液晶显示器的所有薄膜晶体管的栅极全部打开，使该存储电容中的电荷可及时释放，从而消除关机残影现象。
一种现有技术揭露的液晶显示器10如图1所示，其包括一主控电路板11、一栅极驱动芯片12、一数据驱动芯片13、一液晶显示面板14和一软性印刷电路板(Flexible Printed Circuit，FPC)15。该主控电路板11包括一驱动控制电路111、一电源电路112和一栅极全开信号产生电路113。该电源电路112为该驱动控制电路111、该栅极驱动芯片12和该数据驱动芯片13提供电压源。该驱动控制电路111控制该栅极驱动芯片12和该数据驱动芯片13的时序和信号输出。该栅极驱动芯片12和该数据驱动芯片13设置在该液晶显示面板14上，其采用玻璃覆晶封装技术(ChipOn Glass，COG)，通过异方性导电膜(Anisotropic Conductive Film，ACF)连接到液晶显示面板14，以提供显示信号给该液晶显示面板14。该主控电路板11与该栅极驱动芯片12和该数据驱动芯片13通过该软性印刷电路板15连接。
该液晶显示器10工作时，二电源电压信号V1和V2通过该软性印刷电路板15的排线分别传送至该数据驱动芯片13和该栅极驱动芯片12。当关闭液晶显示器10时，该栅极全开信号产生电路113通过该软性印刷电路板15的排线传送一栅极全开信号Xon给该栅极驱动芯片12。该栅极驱动芯片12接收到该信号Xon后，将该液晶显示面板14上所有薄膜晶体管的栅极全部打开，使得存储电容中的存留电荷可通过该薄膜晶体管迅速释放，从而消除关机残影现象。
但是，该栅极全开信号产生电路113设置在该主控电路板11上，须占用该主控电路板11的空间，从而增大该主控电路板11的尺寸。
【发明内容】
为解决上述液晶显示器主控电路板尺寸增大的问题，有必要提供一种可节省主控电路板空间的控制电路装置。
为解决上述液晶显示器主控电路板尺寸增大的问题，有必要提供一种采用上述控制电路装置的液晶显示器。
一种控制电路装置，用于控制液晶显示面板的显示，其包括一主控电路板、一栅极驱动芯片和一数据驱动芯片，该主控电路板与该栅极驱动芯片和该数据驱动芯片相连，该栅极驱动芯片和该数据驱动芯片之一包括一电压侦测电路，该电压侦测电路包括一输入端和一输出端，该输入端用于侦测该数据驱动芯片的电源电压输入状况，当该主控电路板的输入端侦测到该数据驱动芯片的电源电压下降到一设定电压时，该电压侦测电路的输出端输出一栅极全开信号给该栅极驱动芯片。
一种液晶显示器，其包括一主控电路板、一栅极驱动芯片、一数据驱动芯片和一液晶显示面板，该主控电路板与该栅极驱动芯片和该数据驱动芯片相连，该栅极驱动芯片和该数据驱动芯片设置在该液晶显示面板上，该栅极驱动芯片和该数据驱动芯片之一包括一电压侦测电路，该电压侦测电路包括一输入端和一输出端，该输入端用于侦测该数据驱动芯片的电源电压输入状况。当该主控电路板的输入端侦测到该数据驱动芯片的电源电压下降到一设定电压时，该电压侦测电路的输出端输出一栅极全开信号给该栅极驱动芯片。
相较于现有技术，上述液晶显示器和控制电路装置将电压侦测器集成至位于液晶显示面板上的驱动芯片以提供栅极全开信号，无须在主控电路板上设置栅极全开信号产生电路，故可节省该主控电路板的尺寸。
【附图说明】
图1是现有技术的液晶显示器的示意图。
图2是本发明的液晶显示器的示意图。
图3是图2的电压侦测器的电路图。
图4是图3所示电压侦测器的信号时序图。
【具体实施方式】
请参阅图2，是本发明一较佳实施方式的液晶显示器20的示意图。该液晶显示器20包括一主控电路板21、一栅极驱动芯片22、一数据驱动芯片23、一液晶显示面板24和一软性印刷电路板25。该主控电路板21包括一驱动控制电路211和一电源电路212。该电源电路212为该驱动控制电路211、该栅极驱动芯片22和该数据驱动芯片23提供电压源。该栅极驱动芯片22和该数据驱动芯片23设置在该液晶显示面板24上，其采用玻璃覆晶封装技术，通过异方性导电膜连接到液晶显示面板24，以提供显示信号给该液晶显示面板24。该主控电路板21与该栅极驱动芯片22和该数据驱动芯片23通过该软性印刷电路板25保持连接。该液晶显示面板24上设置一导线(图未示)，该栅极驱动芯片22和该数据驱动芯片23通过该导线连接。
该液晶显示器20工作时，二电源信号V1和V2通过该软性印刷电路板25的排线分别传送至该数据驱动芯片23和该栅极驱动芯片22。该数据驱动芯片23内部集成有一电压侦测器230，其通过侦测该电压V1的变化来侦测该液晶显示器的关机动作，并输出一栅极全开信号Xon给该栅极驱动芯片230。
请参阅图3，是该电压侦测器230的电路图.该电压侦测器230中，二电阻231和232串联于输入端IN和接地端GND之间，该二电阻231和232的连接点与运算放大器241的反相输入端相连接.该运算放大器241的同相输入端分别与电流源242的一端和二极管261的负极电连接，该运算放大器241的输出端通过电阻233连接至双极型晶体管271的基极.该电流源242的另一端电连接至该输入端IN，该二极管261的正极电连接至接地端GND.该双极型晶体管271的发射极电连接至该接地端GND，该双极型晶体管271的集电极通过电阻234连接至运算放大器251的反相输入端.电流源252电连接于该运算放大器251的反相输入端与该输入端IN之间.该运算放大器251的同相输入端电连接至该输出端OUT，该运算放大器251的输出端通过电阻235电连接至双极型晶体管281的基极.该双极型晶体管281的集电极和发射极分别电连接至该输出端OUT和该接地端GND.
请参阅图4，是该电压侦测器231输入端IN的电压Vin、该运算放大器241输出端的电压Va和该电压侦测器231输出端OUT的电压Vout的时序关系图。由图可见，当该输入端IN的电压Vin下降到某一设定值Vth时，Va由低电压变为高电压，输出端的电压Vout相应地从高电压变为低电压。
该电压侦测器231的输入端IN与该数据驱动芯片23的电源输入端电连接，该电压侦测器231的输出端OUT通过一设置在该液晶显示面板24上的导线电连接至该栅极驱动芯片22的栅极全开信号控制端。当液晶显示器20有一关机动作时，该数据驱动芯片23的电源电压V1会下降，当下降到某一设定电压时，该电压侦测器231就会侦测到关机动作，进而由该输出端OUT发出一低电压闸极全开信号Xon，通过导线传送给该栅极驱动芯片22的栅极全开信号控制引脚。该栅极驱动芯片22接收到该栅极全开信号Xon后，会驱动该液晶显示面板24的薄膜晶体管的栅极全部打开，使得存留于液晶显示面板的存储电容中的电荷得以迅速释放，从而消除关机残影现象。
由于上述液晶显示器20将电压侦测器230集成至位于该液晶显示面板24上的数据驱动芯片23以提供栅极全开信号，无须在主控电路板21上设置栅极全开信号产生电路，故可节省该主控电路板21的空间；而且，无须在该主控电路板21与该栅极驱动芯片22之间的软性印刷电路板上25设置该栅极全开信号排线，可省去该软性印刷电路板25的一条排线。
本发明并不限于上述实施方式，例如，该电压侦测器230并不限于该集成至该数据驱动芯片23，其还可集成至该栅极驱动芯片22，其电压输入端可与该栅极驱动芯片22的电源电连接，侦测该栅极驱动芯片电源电压V2的变化，来侦测关机动作，以产生一栅极全开信号，使得残留于液晶面板的存储电容中的电荷及时释放，从而消除关机残影现象。同理，如此设置也可节省主控电路板空间和减少软性印刷电路板排线。

Claims (7)

1.一种控制电路装置，用于控制液晶显示面板的显示，其包括：
一主控电路板、一栅极驱动芯片和一数据驱动芯片，该主控电路板与该栅极驱动芯片和该数据驱动芯片相连，其特征在于：该栅极驱动芯片和该数据驱动芯片之一包括一电压侦测电路，该电压侦测电路包括一输入端和一输出端，该输入端用于侦测该数据驱动芯片的电源电压输入状况，当该主控电路板的输入端侦测到该数据驱动芯片的电源电压下降到一设定电压时，该电压侦测电路的输出端输出一栅极全开信号给该栅极驱动芯片。
2.如权利要求1所述的控制电路装置，其特征在于：还包括一软性印刷电路板，该主控电路板通过该软性印刷电路板与该栅极驱动芯片和该数据驱动芯片相连。
3.如权利要求1所述的控制电路装置，其特征在于：当该电压侦测电路设置在该数据驱动芯片中时，该数据驱动芯片与该栅极驱动芯片之间设有一导线，用于传输该栅极全开信号。
4.一种液晶显示器，其包括：一主控电路板、一栅极驱动芯片、一数据驱动芯片和一液晶显示面板，该主控电路板与该栅极驱动芯片和该数据驱动芯片相连，该栅极驱动芯片和该数据驱动芯片设置在该液晶显示面板上，其特征在于：该栅极驱动芯片和该数据驱动芯片之一包括一电压侦测电路，该电压侦测电路包括一输入端和一输出端，该输入端用于侦测该数据驱动芯片的电源电压输入状况，当该主控电路板的输入端侦测到该数据驱动芯片的电源电压下降到一设定电压时，该电压侦测电路的输出端输出一栅极全开信号给该栅极驱动芯片。
5.如权利要求4所述的液晶显示器，其特征在于：还包括一软性印刷电路板，该主控电路板通过该软性印刷电路板与该栅极驱动芯片和该数据驱动芯片相连。
6.如权利要求4所述的液晶显示器，其特征在于：该栅极驱动芯片和该数据驱动芯片采用玻璃附晶封装技术设置在该液晶显示面板上。
7.如权利要求4所述的液晶显示器，其特征在于：当该电压侦测电路设置在该数据驱动芯片中时，该数据驱动芯片与该栅极驱动芯片之间设置一导线，用于传输该栅极全开信号。
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