WO2020118758A1 - 公共电压调节电路及公共电压调节方法 - Google Patents

公共电压调节电路及公共电压调节方法 Download PDF

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Publication number
WO2020118758A1
WO2020118758A1 PCT/CN2018/122897 CN2018122897W WO2020118758A1 WO 2020118758 A1 WO2020118758 A1 WO 2020118758A1 CN 2018122897 W CN2018122897 W CN 2018122897W WO 2020118758 A1 WO2020118758 A1 WO 2020118758A1
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Prior art keywords
voltage
common voltage
resistor
control signal
common
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English (en)
French (fr)
Inventor
高翔
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • 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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display

Definitions

  • the present invention relates to the field of display technology, and in particular, to a common voltage regulation circuit and a common voltage regulation method.
  • LCD liquid crystal displays
  • other flat display devices have been widely used in mobile phones, TVs, and individuals due to their advantages of high image quality, power saving, thin body, and wide application range.
  • Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream in display devices.
  • liquid crystal display devices which include a liquid crystal display panel and a backlight module.
  • the liquid crystal display panel is composed of a color film substrate (CF, Color Filter) and an array substrate (TFT, Thin Film) Transistor), liquid crystal (LC, Liquid Crystal) sandwiched between the color film substrate and the thin film transistor substrate.
  • CF color film substrate
  • TFT Thin Film Transistor
  • LC liquid crystal
  • the liquid crystal display panel is provided with a plurality of thin film transistors arranged in an array, the gate of each row of TFT corresponds to a gate scanning line in the horizontal direction, and the drain of each column of TFT corresponds to a data line in the vertical direction.
  • the source electrode of each TFT is connected to a pixel electrode, corresponding to the pixel electrode is provided with a common electrode, the common electrode is connected to the common electrode line, by applying a common voltage to the common electrode line to the common electrode and by scanning signals Turn on each TFT row by row, apply the data voltage to the pixel electrode row by row, and drive the liquid crystal to rotate through the cooperation of the common voltage and the data voltage to realize the picture display.
  • the prior art proposes a common voltage regulation circuit, which includes a digital adjustable resistor DVR' and two operational amplifiers OP', the digital adjustable resistor One end of the DVR' is connected to the power supply voltage VAA', and the other end is electrically connected to the non-inverting input terminals of the two operational amplifiers OP'.
  • the output of each operational amplifier OP' outputs a common voltage Vcom' to the display panel 100'.
  • Each operational amplifier The inverting input terminals of OP' all receive the feedback voltage Vfb' of the common voltage Vcom' from the display panel 100', and adjust the common voltage Vcom' through the feedback voltage Vfb' to keep the common voltage Vcom' stable, however As shown in Figure 2, this circuit will cause a delay from receiving the feedback voltage Vfb' to completing the adjustment of the common voltage Vcom'. In a high-resolution liquid crystal display panel with a short charging time, the delay time may be close to or exceed The charging time of a row of sub-pixels, this time the circuit will not be able to eliminate horizontal crosstalk, nor can it improve the display quality.
  • the object of the present invention is to provide a common voltage adjustment circuit, which can realize real-time compensation of common voltage without delay, eliminate horizontal crosstalk, and improve display quality.
  • the purpose of the present invention is also to provide a common voltage adjustment method, which can realize real-time compensation without delay for the common voltage, eliminate horizontal crosstalk, and improve display quality.
  • the present invention provides a common voltage regulation circuit, including: a voltage generating module, a voltage output module electrically connected to the voltage generating module, and an electrical connection to the voltage output module and the voltage generating module Voltage regulation module and timing controller electrically connected to the voltage regulation module;
  • the voltage generating module is used to receive a power supply voltage and use the power supply voltage to generate a reference voltage
  • the voltage output module is used to receive a reference voltage, generate a common voltage according to the reference voltage, and input the common voltage to the display panel;
  • the timing controller is used to monitor the gray-scale change of the image to be displayed on the display panel and determine whether the public voltage needs to be compensated according to the gray-scale change of the image to be displayed, and output a control signal to the voltage adjustment module when the public voltage needs to be compensated;
  • the voltage adjustment module is used to adjust the reference voltage under the control of the control signal to compensate for the common voltage.
  • the timing controller determines that the common voltage needs to be compensated when the gray level change of two adjacent rows of sub-pixels in the picture to be displayed exceeds a preset gray level threshold.
  • the timing controller outputs a first control signal to the voltage adjustment module when it is determined that the common voltage needs to be compensated, and the gray levels of the two adjacent rows of sub-pixels in the picture to be displayed change from high to low;
  • the timing controller outputs a second control signal to the voltage adjustment module when it is determined that the common voltage needs to be compensated, and the gray level of the two adjacent rows of sub-pixels in the displayed image changes from low to high.
  • the voltage regulation module receives a low voltage under the control of the first control signal to pull down the reference voltage through the low voltage
  • the voltage regulation module receives a high voltage under the control of the second control signal to pull up the reference voltage through the high voltage.
  • the voltage generating module includes: a digital adjustable resistor and a first resistor; a first end of the digital adjustable resistor receives a power supply voltage, and a second end is electrically connected to the first end of the first resistor ; The second end of the first resistor outputs a reference voltage;
  • the voltage output module includes: a capacitor and at least one operational amplifier; the first end of the capacitor is electrically connected to the second end of the first resistor, and the second end is grounded; the non-inverting input end of each operational amplifier is electrically connected to the first The second terminal of a resistor, the inverting input terminal is electrically connected to the output terminal, and the output terminals output common voltage to the display panel;
  • the voltage regulation module includes a first transistor, a second transistor, a second resistor, and a third resistor;
  • the base of the first triode is electrically connected to the first output end of the timing controller for outputting the first control signal
  • the emitter is electrically connected to the first end of the second resistor
  • the collector is electrically connected to the first The second end of the resistor; the second end of the second resistor is connected to a low voltage; the base of the second transistor is electrically connected to the second output end of the timing controller for outputting the second control signal
  • the emitter is electrically connected to the first end of the third resistor, and the collector is electrically connected to the second end of the first resistor; the second end of the third resistor is connected to a high voltage.
  • the preset gray scale threshold is greater than 100.
  • the invention also provides a common voltage regulation method, including the following steps:
  • Step S1 Receive the power supply voltage and use the power supply voltage to generate a reference voltage
  • Step S2 Generate a common voltage according to the reference voltage, and input the common voltage to the display panel;
  • Step S3 Monitor the gray-scale change of the picture to be displayed on the display panel, and determine whether the public voltage needs to be compensated according to the gray-scale change of the picture to be displayed;
  • Step S4 Generate a control signal when the common voltage needs to be compensated, and adjust the reference voltage under the control of the control signal to compensate the common voltage.
  • step S4 when the gray level change of the two adjacent rows of sub-pixels in the image to be displayed exceeds a preset gray level threshold, it is determined that the common voltage needs to be compensated.
  • a first control signal is generated.
  • the The reference voltage is connected to a low potential and pulled down by the low potential, and the common voltage is compensated to maintain a stable potential;
  • a second control signal is generated.
  • the The reference voltage is connected to a high potential and pulled high by the high potential, and the common voltage is compensated to maintain a stable potential.
  • the preset gray scale threshold is greater than 100.
  • the present invention provides a common voltage regulating circuit, including: a voltage generating module, a voltage output module electrically connected to the voltage generating module, and an electrical connection to the voltage output module and the voltage generating module Voltage regulator module and a timing controller electrically connected to the voltage regulator module; the timing controller monitors the gray scale change of the screen to be displayed on the display panel and determines whether the public voltage needs to be compensated according to the gray scale change of the screen to be displayed, And when the common voltage needs to be compensated, it outputs a control signal to the voltage regulation module to control the voltage regulation module to adjust the reference voltage to compensate the common voltage, thereby realizing real-time compensation of the common voltage without delay and effectively eliminating horizontal crosstalk, Improve display quality.
  • the invention also provides a common voltage adjustment method, which can realize real-time compensation without delay for the common voltage, eliminate horizontal crosstalk, and improve display quality.
  • Figure 1 is a schematic diagram of an existing public voltage regulation circuit
  • Figure 2 is a waveform diagram of an existing public voltage regulation circuit
  • FIG. 3 is a schematic diagram of the public voltage regulation circuit of the present invention.
  • FIG. 4 is a circuit diagram of a preferred embodiment of the common voltage regulating circuit of the present invention.
  • FIG. 5 is a schematic diagram of a screen to be displayed in a preferred embodiment of the common voltage regulating circuit of the present invention.
  • FIG. 6 is a waveform diagram corresponding to the position A in FIG. 5 of the common voltage regulating circuit of the present invention.
  • FIG. 7 is a waveform diagram corresponding to the position B in FIG. 5 of the common voltage regulating circuit of the present invention.
  • FIG. 8 is a flowchart of the public voltage adjustment method of the present invention.
  • the invention provides a common voltage adjustment circuit, which is applied to a liquid crystal display panel to eliminate horizontal crosstalk caused by ripple of the common voltage and improve display quality.
  • the common voltage regulation circuit includes: a voltage generation module 1 , And the voltage generating module 1 Electrically connected voltage output module 2 , And the voltage output module 2 And voltage generation module 1 Equally connected voltage regulation module 3 And with the voltage regulation module 3 Electrically connected timing controller 4 .
  • the voltage generating module 1 Used to receive power supply voltage VAA And use the power supply voltage VAA Generate reference voltage Vcom_Ref ;
  • the voltage output module 2 Used to receive reference voltage Vcom_Ref , And according to the reference voltage Vcom_Ref Generate common voltage Vcom , And the common voltage Vcom Input display panel 100 ;
  • the timing controller 4 Used to monitor the display panel 100 Of the gray level of the screen to be displayed and the judgment of the common voltage according to the gray level of the screen to be displayed Vcom Does it need to be compensated, and in public voltage Vcom Voltage compensation module when compensation is required 3 Output control signal;
  • the voltage regulation module 3 For adjusting the reference voltage under the control of the control signal Vcom_Ref To compensate for the common voltage Vcom .
  • the timing controller 4 When the gray level change of two adjacent rows of sub-pixels in the picture to be displayed exceeds a preset gray level threshold, determine the common voltage Vcom Need compensation.
  • the preset gray scale threshold is greater than 100 .
  • the gray level change of the two adjacent rows of sub-pixels in the picture to be displayed exceeds a preset gray-scale threshold specifically refers to the continuous number of sub-pixels in the two adjacent rows of sub-pixels in the picture to be displayed
  • the gray-scale change exceeds the preset gray-scale threshold, that is, the gray-scale change corresponding to the data voltage on the data lines connected to the arrangement exceeds the preset within the charging time of the two adjacent rows of sub-pixels in the image to be displayed
  • the actual number of consecutive sub-pixels is greater than one-fifth of a row of sub-pixels.
  • the timing controller 4 According to the different directions of the gray-scale changes of the adjacent two rows of sub-pixels, the voltage regulation module 3 Output different control signals.
  • the voltage adjustment module 3 Output the first control signal GPO_L ;
  • the timing controller 4 In determining the common voltage Vcom When compensation is needed, and the gray level change of the two adjacent rows of sub-pixels in the picture to be displayed changes from low to high, to the voltage adjustment module 3 Output second control signal GPO_H .
  • the voltage regulation module 3 The first control signal GPO_L Receiving low voltage under the control of V1 To pass the low voltage V1 Pull down the reference voltage Vcom_Ref ;
  • the voltage regulation module 3 The second control signal GPO_H Receiving high voltage under the control of V2 To pass the high voltage V2 Raise the reference voltage Vcom_Ref .
  • the voltage generating module 1 Including: digital adjustable resistor DVR And the first resistance R1 ;
  • the voltage output module 2 Including: capacitance C1 And at least one operational amplifier OP ;
  • the voltage regulation module 3 Including the first transistor M1 , The second transistor M2 ⁇ Second resistance R2 And the third resistor R3 ;
  • the digital adjustable resistor DVR The first terminal receives the power supply voltage VAA , The second end and the first resistor R1 The first end of the electrical connection;
  • the first resistance R1 The second terminal output reference voltage Vcom_Ref ;
  • the capacitance C1 The first terminal is electrically connected to the first resistor R1 The second end, the second end is grounded;
  • the non-inverting input terminal is electrically connected to the first resistor R1
  • the second terminal, the inverting input terminal is electrically connected to the output terminal, and the output terminal outputs the common voltage to the display panel Vcom ;
  • the first triode M1 Of the base is electrically connected to the timing controller 4 Used to output the first control signal GPO_L
  • the emitter is electrically connected to the second resistor R2 At the first end, the collector is electrically connected to the first resistor R1 The second end of
  • the second resistor R2 Connect the second terminal to a low voltage V1 ;
  • the second transistor M2 Of the base is electrically connected to the timing controller 4 Used to output the second control signal GPO_H
  • the emitter is electrically connected to the third resistor R3 At the first end, the collector is electrically connected to the first resistor R1 The second end of
  • the third resistor R3 The second terminal is connected to a high voltage V2 .
  • the low potential V1 It is the ground potential.
  • the first control signal GPO_L When outputting a high-potential pulse, the first transistor M1 Turn on, the second control signal GPO_H , The second transistor M2 When outputting a low-potential pulse, the second transistor M2 Turn on.
  • the operational amplifier OP The number is 2
  • the present invention is not limited to this, when necessary, the operational amplifier OP
  • the numerical control can be other quantities, for example 1 Or 3 Pcs.
  • the present invention uses a second control signal GPO_H Turn on the second transistor M2 , So that the high potential V2 Access, using the high voltage V2 Raise the reference voltage Vcom_Ref So that the reference voltage Vcom_Ref Common voltage Vcom It is also pulled high, and after matching with the low potential ripple caused by the grayscale change, the real-time output common voltage Vcom The waveform of will remain stable, making the common voltage Vcom The output of is not affected by changes in gray scale;
  • the screen to be displayed jumps from white to black, that is, the gray level of the two adjacent rows of sub-pixels in the screen to be displayed changes from high to low, if the common voltage is not correct Vcom Compensation, the common voltage will appear high potential ripple, so in order to eliminate the high potential ripple to maintain the stability of the common voltage, the present invention uses the first control signal GPO_L Turn on the first triode M1 , So that the low potential V1 Access, using the low voltage V1 Pull down the reference voltage Vcom_Ref So that the reference voltage Vcom_Ref Common voltage Vcom It is also pulled down, and after matching with the high potential ripple caused by the grayscale change, the real-time output common voltage Vcom The waveform of will remain stable, making the common voltage Vcom The output of is not affected by changes in gray scale.
  • the present invention also provides a common voltage regulation method, including the following steps:
  • step S1 Receiving power supply voltage VAA And use the power supply voltage VAA Generate reference voltage Vcom_Ref ;
  • step S2 According to the reference voltage Vcom_Ref Generate common voltage Vcom , And the common voltage Vcom Input display panel;
  • step S3 Monitor the gray-scale change of the screen to be displayed on the display panel, and judge the common voltage according to the gray-scale change of the screen to be displayed Vcom Whether compensation is required;
  • step S4 At public voltage Vcom Generate a control signal when compensation is needed, and adjust the reference voltage under the control of the control signal Vcom_Ref To compensate for the common voltage Vcom .
  • the steps S4 When the gray level change of two adjacent rows of sub-pixels in the picture to be displayed exceeds the preset gray level threshold, determine the common voltage Vcom Need compensation.
  • the preset gray scale threshold is greater than 100 .
  • the gray level change of the two adjacent rows of sub-pixels in the picture to be displayed exceeds a preset gray-scale threshold specifically refers to the continuous number of sub-pixels in the two adjacent rows of sub-pixels in the picture to be displayed
  • the gray-scale change exceeds the preset gray-scale threshold, that is, the gray-scale change corresponding to the data voltage on the data lines connected to the arrangement exceeds the preset within the charging time of the two adjacent rows of sub-pixels in the image to be displayed
  • the actual number of consecutive sub-pixels is greater than one-fifth of a row of sub-pixels.
  • the common voltage Vcom Compensation is required, and the first control signal is generated when the gray level of the two adjacent rows of sub-pixels in the screen to be displayed changes from high to low GPO_L , Under the control of the first control signal, the reference voltage Vcom_Ref With a low potential V1 Connected and being low potential V1 Pull down, the common voltage Vcom Be compensated to maintain a stable potential;
  • the common voltage Vcom Compensation is needed, and the second control signal is generated when the gray level of the two adjacent rows of sub-pixels in the picture to be displayed changes from low to high GPO_H , Under the control of the second control signal, the reference voltage Vcom_Ref With a high potential V2 Connected and being high-potential V2 Pulled high, the common voltage Vcom Be compensated to maintain a stable potential.
  • the screen to be displayed jumps from black to white, that is, when the gray level of the two adjacent sub-pixels changes from high to low, if the common voltage is not correct Vcom Compensation, the common voltage will have a low potential ripple, so in order to eliminate the low potential ripple to maintain the stability of the common voltage, the present invention uses the high voltage V2 Raise the reference voltage Vcom_Ref So that the reference voltage Vcom_Ref Common voltage Vcom It is also pulled high, and after matching with the low potential ripple caused by the grayscale change, the real-time output common voltage Vcom The waveform of will remain stable, making the common voltage Vcom The output of is not affected by changes in gray scale;
  • the screen to be displayed jumps from white to black, that is, the gray level of the two adjacent rows of sub-pixels in the screen to be displayed changes from high to low, if the common voltage is not correct Vcom Compensation, the common voltage will appear high potential ripple, so in order to eliminate the high potential ripple to maintain the stability of the common voltage, the present invention uses the low voltage V1 Pull down the reference voltage Vcom_Ref So that the reference voltage Vcom_Ref Common voltage Vcom It is also pulled down, and after matching with the high potential ripple caused by the grayscale change, the real-time output common voltage Vcom The waveform of will remain stable, making the common voltage Vcom The output of is not affected by changes in gray scale.
  • the present invention provides a common voltage regulating circuit, including: a voltage generating module, a voltage output module electrically connected to the voltage generating module, and a voltage electrically connected to the voltage output module and the voltage generating module An adjustment module and a timing controller electrically connected to the voltage adjustment module; the timing controller determines whether the public voltage needs to be compensated by monitoring the gray-scale change of the picture to be displayed on the display panel and according to the gray-scale change of the picture to be displayed, and When the common voltage needs to be compensated, it outputs a control signal to the voltage regulation module to control the voltage regulation module to adjust the reference voltage to compensate the common voltage, thereby realizing the real-time compensation of the common voltage without delay, effectively eliminating horizontal crosstalk, and improving the display quality.
  • the invention also provides a common voltage adjustment method, which can realize real-time compensation without delay for the common voltage, eliminate horizontal crosstalk, and improve display quality.

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Abstract

一种公共电压调节电路及公共电压调节方法，所述公共电压调节电路包括：电压产生模块（1）、与所述电压产生模块（1）电性连接的电压输出模块（2）、与所述电压输出模块（2）和电压产生模块（1）均电性连接的电压调节模块（3）以及与所述电压调节模块（3）电性连接的时序控制器（4），时序控制器（4）通过监测显示面板（100）的待显示画面的灰阶变化以及根据待显示画面的灰阶变化判断公共电压是否需要补偿，并在公共电压需要补偿时向电压调节模块（3）输出控制信号，以控制所述电压调节模块（3）对参考电压进行调节，补偿公共电压，从而实现对公共电压进行无延迟的实时补偿，有效消除水平串扰，提升显示质量。

Description

公共电压调节电路及公共电压调节方法 技术领域
本发明涉及显示技术领域，尤其涉及一种公共电压调节电路及公共电压调节方法。
 背景技术
随着显示技术的发展，液晶显示器（Liquid Crystal Display，LCD）等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。
现有市场上的液晶显示装置大部分为背光型液晶显示器，其包括液晶显示面板及背光模组（backlight module）。液晶显示面板由彩膜基板（CF，Color Filter）、阵列基板（TFT，Thin Film Transistor)、夹于彩膜基板与薄膜晶体管基板之间的液晶（LC，Liquid Crystal）。
液晶显示面板中设有阵列排布的多个薄膜晶体管，每一行TFT的栅极对应连接至水平方向的一条栅极扫描线，每一列TFT的漏极对应连接至竖直方向的一条数据线，每一个TFT的源极则连接至一像素电极，对应所述像素电极设有公共电极，所述公共电极与连接公共电极线，通过向公共电极线向公共电极施加公共电压以及通过在扫描信号逐行开启各个TFT，将数据电压逐行施加到像素电极上，通过所述公共电压和数据电压的配合驱动液晶旋转，实现画面显示。
由于液晶显示面板本身结构的限制，公共电压会受到扫描信号和数据电压的影响而出现纹波，造成水平串扰，使得显示画面降低。如图1所示，为了改善水平串扰，现有技术提出了一种公共电压调节电路，其包括一个数字式可调电阻器DVR’及两个运算放大器OP’，所述数字式可调电阻器DVR’一端接入电源电压VAA’，另一端电性连接两运算放大器OP’的同相输入端，每一运算放大器OP’的输出端均向显示面板100’输出公共电压Vcom’，每一运算放大器OP’的反相输入端均从显示面板100’接收公共电压Vcom’的反馈电压Vfb’，通过所述反馈电压Vfb’调节所述公共电压Vcom’，以保持所述公共电压Vcom’稳定，然而如图2所示，该电路从接收到反馈电压Vfb’到完成公共电压Vcom’的调节会产生延时，在充电时间较短的高解析度液晶显示面板中，延时时间可能会接近或超过一行子像素的充电时间，此时该电路将不能消除水平串扰，也无法提升显示质量。
 技术问题
本发明的目的在于提供一种公共电压调节电路，能够实现对公共电压进行无延迟的实时补偿，消除水平串扰，提升显示质量。
本发明的目的还在于提供公共电压调节方法，能够实现对公共电压进行无延迟的实时补偿，消除水平串扰，提升显示质量。
 技术解决方案
为实现上述目的，本发明提供了一种公共电压调节电路，包括：电压产生模块、与所述电压产生模块电性连接的电压输出模块、与所述电压输出模块和电压产生模块均电性连接的电压调节模块以及与所述电压调节模块电性连接的时序控制器；
所述电压产生模块用于接收电源电压，并利用电源电压产生参考电压；
所述电压输出模块用于接收参考电压，并根据参考电压产生公共电压，并将公共电压输入显示面板；
所述时序控制器用于监测显示面板的待显示画面的灰阶变化以及根据待显示画面的灰阶变化判断公共电压是否需要补偿，并在公共电压需要补偿时向电压调节模块输出控制信号；
所述电压调节模块用于在所述控制信号的控制下调节所述参考电压，以补偿公共电压。
所述时序控制器在待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值时，确定公共电压需要补偿。
所述时序控制器在确定公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从高往低变化时，向所述电压调节模块输出第一控制信号；
所述时序控制器在确定公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从低往高变化时，向所述电压调节模块输出第二控制信号。
所述电压调节模块在第一控制信号的控制下接收低电压，以通过所述低电压拉低所述参考电压；
所述电压调节模块在第二控制信号的控制下接收高电压，以通过所述高电压拉高所述参考电压。
所述电压产生模包括：数字式可调电阻器及第一电阻；所述数字式可调电阻器的第一端接收电源电压，第二端与所述第一电阻的第一端电性连接；所述第一电阻的第二端输出参考电压；
所述电压输出模块包括：电容及至少一个运算放大器；所述电容的第一端电性连接第一电阻的第二端，第二端接地；每一个运算放大器的同相输入端均电性连接第一电阻的第二端，反相输入端均电性连接输出端，输出端均向显示面板输出公共电压；
所述电压调节模块包括第一三极管、第二三极管、第二电阻及第三电阻；
所述第一三极管的基极电性连接所述时序控制器用于输出第一控制信号的第一输出端，发射极电性连接第二电阻的第一端，集电极电性连接第一电阻的第二端；所述第二电阻的第二端接入低电压；所述第二三极管的基极电性连接所述时序控制器用于输出第二控制信号的第二输出端，发射极电性连接第三电阻的第一端，集电极电性连接第一电阻的第二端；所述第三电阻的第二端接入高电压。
所述预设的灰阶阈值大于100。
本发明还提供一种公共电压调节方法，包括如下步骤：
步骤S1、接收电源电压，并利用电源电压产生参考电压；
步骤S2、根据参考电压产生公共电压，并将公共电压输入显示面板；
步骤S3、监测显示面板的待显示画面的灰阶变化，并根据待显示画面的灰阶变化判断公共电压是否需要补偿；
步骤S4、在公共电压需要补偿时生成控制信号，并在所述控制信号的控制下调节所述参考电压，以补偿公共电压。
所述步骤S4中在待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值时，确定公共电压需要补偿。
所述步骤S4中，
在所述公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从高往低变化时，生成第一控制信号，在所述第一控制信号的控制下，所述参考电压与一低电位相连，并被所述低电位拉低，所述公共电压被补偿保持稳定电位；
在所述公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从低往高变化时，生成第二控制信号，在所述第二控制信号的控制下，所述参考电压与一高电位相连，并被所述高电位拉高，所述公共电压被补偿保持稳定电位。
所述预设的灰阶阈值大于100。
 有益效果
本发明的有益效果：本发明提供一种公共电压调节电路，包括：电压产生模块、与所述电压产生模块电性连接的电压输出模块、与所述电压输出模块和电压产生模块均电性连接的电压调节模块以及与所述电压调节模块电性连接的时序控制器；时序控制器通过监测显示面板的待显示画面的灰阶变化以及根据待显示画面的灰阶变化判断公共电压是否需要补偿，并在公共电压需要补偿时向电压调节模块输出控制信号，以控制所述电压调节模块对参考电压进行调节，以补偿公共电压，从而实现对公共电压进行无延迟的实时补偿，有效消除水平串扰，提升显示质量。本发明还提供公共电压调节方法，能够实现对公共电压进行无延迟的实时补偿，消除水平串扰，提升显示质量。
 附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为现有的公共电压调节电路的示意图；
图2为现有的公共电压调节电路的波形图；
图3为本发明的公共电压调节电路的示意图；
图4为本发明的公共电压调节电路的优选实施例的电路图；
图5为本发明的公共电压调节电路的优选实施例的待显示画面的示意图；
图6为本发明的公共电压调节电路对应图5中位置A处的波形图；
图7为本发明的公共电压调节电路对应图5中位置B处的波形图；
图8为本发明的公共电压调节方法的流程图。
 本发明的实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
本发明提供一种公共电压调节电路，应用于液晶显示面板中，以消除由于公共电压的纹波而引起的水平串扰，提升显示质量。
请参阅图 3 ，所述公共电压调节电路包括：电压产生模块 1 、与所述电压产生模块 1 电性连接的电压输出模块 2 、与所述电压输出模块 2 和电压产生模块 1 均电性连接的电压调节模块 3 以及与所述电压调节模块 3 电性连接的时序控制器 4 。
其中，所述电压产生模块 1 用于接收电源电压 VAA ，并利用电源电压 VAA 产生参考电压 Vcom_Ref ；
所述电压输出模块 2 用于接收参考电压 Vcom_Ref ，并根据参考电压 Vcom_Ref 产生公共电压 Vcom ，并将公共电压 Vcom 输入显示面板 100 ；
所述时序控制器 4 用于监测显示面板 100 的待显示画面的灰阶变化以及根据待显示画面的灰阶变化判断公共电压 Vcom 是否需要补偿，并在公共电压 Vcom 需要补偿时向电压调节模块 3 输出控制信号；
所述电压调节模块 3 用于在所述控制信号的控制下调节所述参考电压 Vcom_Ref ，以补偿公共电压 Vcom 。
具体地，所述时序控制器 4 在待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值时，确定公共电压 Vcom 需要补偿。
优选地，所述预设的灰阶阈值大于 100 。
需要说明的是，所述待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值具体是指，在待显示画面中相邻两行子像素中的连续数个子像素的灰阶变化超过预设的灰阶阈值，也即在待显示画面中相邻的两行子像素的充电时间内，连接排列的数条数据线上的数据电压所对应灰阶的变化超过预设的灰阶阈值，优选地，所述连续数个子像素的实际数量大于一行子像素的五分之一。
具体地，所述时序控制器 4 根据相邻两行子像素的灰阶变化的方向的不同，向电压调节模块 3 输出不同的控制信号。
具体地，在确定公共电压 Vcom 需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从高往低变化时，向所述电压调节模块 3 输出第一控制信号 GPO_L ；
所述时序控制器 4 在确定公共电压 Vcom 需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从低往高变化时，向所述电压调节模块 3 输出第二控制信号 GPO_H 。
具体地，所述电压调节模块 3 在第一控制信号 GPO_L 的控制下接收低电压 V1 ，以通过所述低电压 V1 拉低所述参考电压 Vcom_Ref ；
所述电压调节模块 3 在第二控制信号 GPO_H 的控制下接收高电压 V2 ，以通过所述高电压 V2 拉高所述参考电压 Vcom_Ref 。
具体地，如图 4 所示，在本发明的优选实施例中，所述电压产生模块 1 包括：数字式可调电阻器 DVR 及第一电阻 R1 ；
所述电压输出模块 2 包括：电容 C1 及至少一个运算放大器 OP ；
所述电压调节模块 3 包括第一三极管 M1 、第二三极管 M2 、第二电阻 R2 及第三电阻 R3 ；
所述数字式可调电阻器 DVR 的第一端接收电源电压 VAA ，第二端与所述第一电阻 R1 的第一端电性连接；
所述第一电阻 R1 的第二端输出参考电压 Vcom_Ref ；
所述电容 C1 的第一端电性连接第一电阻 R1 的第二端，第二端接地；
每一个运算放大器 OP 的同相输入端均电性连接第一电阻 R1 的第二端，反相输入端均电性连接输出端，输出端均向显示面板输出公共电压 Vcom ；
所述第一三极管 M1 的基极电性连接所述时序控制器 4 用于输出第一控制信号 GPO_L 的第一输出端，发射极电性连接第二电阻 R2 的第一端，集电极电性连接第一电阻 R1 的第二端；
所述第二电阻 R2 的第二端接入低电压 V1 ；
所述第二三极管 M2 的基极电性连接所述时序控制器 4 用于输出第二控制信号 GPO_H 的第二输出端，发射极电性连接第三电阻 R3 的第一端，集电极电性连接第一电阻 R1 的第二端；
所述第三电阻 R3 的第二端接入高电压 V2 。
优选地，所述低电位 V1 为接地电位。
具体地，所述第一控制信号 GPO_L 输出高电位脉冲时，所述第一三极管 M1 导通，所述第二控制信号 GPO_H ，所述第二三极管 M2 输出低电位脉冲时，所述第二三极管 M2 导通。
优选地，所述运算放大器 OP 的数量为 2 个，当然本发明对此并不限制，必要时，所述运算放大器 OP 的数控可以为其他数量，例如 1 个或 3 个。
需要说明的是，如图 5 及图 6 所示，在图 5 的 A 位置，待显示画面从黑跳至白，即相邻两行子像素的灰阶变化为从高往低变化时，若不对公共电压 Vcom 进行补偿，公共电压将会出现低电位的纹波，因此为了消除该低电位的纹波保持公共电压的稳定，本发明通过第二控制信号 GPO_H 导通所述第二三极管 M2 ，从而将高电位 V2 接入，利用所述高电压 V2 拉高所述参考电压 Vcom_Ref ，使得由参考电压 Vcom_Ref 产生的公共电压 Vcom 也被拉高，搭配上灰阶变化引起的低电位的纹波后，实时输出的公共电压 Vcom 的波形将保持稳定不变，从而使得公共电压 Vcom 的输出不受灰阶变化影响；
如图 5 及图 7 所示，在图 5 的 B 位置，待显示画面从白跳至黑，即待显示画面中相邻两行子像素的灰阶变化为从高往低变化，若不对公共电压 Vcom 进行补偿，公共电压将会出现高电位的纹波，因此为了消除该高电位的纹波保持公共电压的稳定，本发明通过第一控制信号 GPO_L 导通所述第一三极管 M1 ，从而将低电位 V1 接入，利用所述低电压 V1 拉低所述参考电压 Vcom_Ref ，使得由参考电压 Vcom_Ref 产生的公共电压 Vcom 也被拉低，搭配上灰阶变化引起的高电位的纹波后，实时输出的公共电压 Vcom 的波形将保持稳定不变，从而使得公共电压 Vcom 的输出不受灰阶变化影响。
结合图 5 至图 7 可知，利用本发明的公共电压调节电路的调节，可保持输入至显示面板 100 中的公共电压 Vcom 始终保持稳定，从而能够有效消除水平串扰，且对公共电压 Vcom 的补偿不存在延迟，在高解析度显示面板中也能有效发挥作用。
请参阅图 8 ，本发明还提供一种公共电压调节方法，包括如下步骤：
步骤 S1 、接收电源电压 VAA ，并利用电源电压 VAA 产生参考电压 Vcom_Ref ；
步骤 S2 、根据参考电压 Vcom_Ref 产生公共电压 Vcom ，并将公共电压 Vcom 输入显示面板；
步骤 S3 、监测显示面板的待显示画面的灰阶变化，并根据待显示画面的灰阶变化判断公共电压 Vcom 是否需要补偿；
步骤 S4 、在公共电压 Vcom 需要补偿时生成控制信号，并在所述控制信号的控制下调节所述参考电压 Vcom_Ref ，以补偿公共电压 Vcom 。
具体地，所述步骤 S4 中在待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值时，确定公共电压 Vcom 需要补偿。
优选地，所述预设的灰阶阈值大于 100 。
需要说明的是，所述待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值具体是指，在待显示画面中相邻两行子像素中的连续数个子像素的灰阶变化超过预设的灰阶阈值，也即在待显示画面中相邻的两行子像素的充电时间内，连接排列的数条数据线上的数据电压所对应灰阶的变化超过预设的灰阶阈值，优选地，所述连续数个子像素的实际数量大于一行子像素的五分之一。
具体地，在所述公共电压 Vcom 需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从高往低变化时，生成第一控制信号 GPO_L ，在所述第一控制信号的控制下，所述参考电压 Vcom_Ref 与一低电位 V1 相连，并被所述低电位 V1 拉低，所述公共电压 Vcom 被补偿保持稳定电位；
在所述公共电压 Vcom 需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从低往高变化时，生成第二控制信号 GPO_H ，在所述第二控制信号的控制下，所述参考电压 Vcom_Ref 与一高电位 V2 相连，并被所述高电位 V2 拉高，所述公共电压 Vcom 被补偿保持稳定电位。
需要说明的是，如图 5 及图 6 所示，在图 5 的 A 位置，待显示画面从黑跳至白，即相邻两行子像素的灰阶变化为从高往低变化时，若不对公共电压 Vcom 进行补偿，公共电压将会出现低电位的纹波，因此为了消除该低电位的纹波保持公共电压的稳定，本发明通过所述高电压 V2 拉高所述参考电压 Vcom_Ref ，使得由参考电压 Vcom_Ref 产生的公共电压 Vcom 也被拉高，搭配上灰阶变化引起的低电位的纹波后，实时输出的公共电压 Vcom 的波形将保持稳定不变，从而使得公共电压 Vcom 的输出不受灰阶变化影响；
如图 5 及图 7 所示，在图 5 的 B 位置，待显示画面从白跳至黑，即待显示画面中相邻两行子像素的灰阶变化为从高往低变化，若不对公共电压 Vcom 进行补偿，公共电压将会出现高电位的纹波，因此为了消除该高电位的纹波保持公共电压的稳定，本发明通过所述低电压 V1 拉低所述参考电压 Vcom_Ref ，使得由参考电压 Vcom_Ref 产生的公共电压 Vcom 也被拉低，搭配上灰阶变化引起的高电位的纹波后，实时输出的公共电压 Vcom 的波形将保持稳定不变，从而使得公共电压 Vcom 的输出不受灰阶变化影响。
结合图 5 至图 7 可知，利用本发明的公共电压调节电路的调节，可保持输入至显示面板 100 中的公共电压 Vcom 始终保持稳定，从而能够有效消除水平串扰，且对公共电压 Vcom 的补偿不存在延迟，在高解析度显示面板中也能有效发挥作用。
综上所述，本发明提供一种公共电压调节电路，包括：电压产生模块、所述电压产生模块电性连接的电压输出模块、与所述电压输出模块和电压产生模块均电性连接的电压调节模块以及与所述电压调节模块电性连接的时序控制器；时序控制器通过监测显示面板的待显示画面的灰阶变化以及根据待显示画面的灰阶变化判断公共电压是否需要补偿，并在公共电压需要补偿时向电压调节模块输出控制信号，以控制所述电压调节模块对参考电压进行调节，以补偿公共电压，从而实现对公共电压进行无延迟的实时补偿，有效消除水平串扰，提升显示质量。本发明还提供公共电压调节方法，能够实现对公共电压进行无延迟的实时补偿，消除水平串扰，提升显示质量。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种公共电压调节电路，包括：电压产生模块、与所述电压产生模块电性连接的电压输出模块、与所述电压输出模块和电压产生模块均电性连接的电压调节模块以及与所述电压调节模块电性连接的时序控制器；
    所述电压产生模块用于接收电源电压，并利用电源电压产生参考电压；
    所述电压输出模块用于接收参考电压，并根据参考电压产生公共电压，并将公共电压输入显示面板；
    所述时序控制器用于监测显示面板的待显示画面的灰阶变化以及根据待显示画面的灰阶变化判断公共电压是否需要补偿，并在公共电压需要补偿时向电压调节模块输出控制信号；
    所述电压调节模块用于在所述控制信号的控制下调节所述参考电压，以补偿公共电压。
  2. 如权利要求1所述的公共电压调节电路，其中，所述时序控制器在待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值时，确定公共电压需要补偿。
  3. 如权利要求2所述的公共电压调节电路，其中，所述时序控制器在确定公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从高往低变化时，向所述电压调节模块输出第一控制信号；
    所述时序控制器在确定公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从低往高变化时，向所述电压调节模块输出第二控制信号。
  4. 如权利要求3所述的公共电压调节电路，其中，所述电压调节模块在第一控制信号的控制下接收低电压，以通过所述低电压拉低所述参考电压；
    所述电压调节模块在第二控制信号的控制下接收高电压，以通过所述高电压拉高所述参考电压。
  5. 如权利要求4所述的公共电压调节电路，其中，所述电压产生模块包括：数字式可调电阻器及第一电阻；所述数字式可调电阻器的第一端接收电源电压，第二端与所述第一电阻的第一端电性连接；所述第一电阻的第二端输出参考电压；
    所述电压输出模块包括：电容及至少一个运算放大器；所述电容的第一端电性连接第一电阻的第二端，第二端接地；每一个运算放大器的同相输入端均电性连接第一电阻的第二端，反相输入端均电性连接输出端，输出端均向显示面板输出公共电压；
    所述电压调节模块包括第一三极管、第二三极管、第二电阻及第三电阻；
    所述第一三极管的基极电性连接所述时序控制器用于输出第一控制信号的第一输出端，发射极电性连接第二电阻的第一端，集电极电性连接第一电阻的第二端；所述第二电阻的第二端接入低电压；所述第二三极管的基极电性连接所述时序控制器用于输出第二控制信号的第二输出端，发射极电性连接第三电阻的第一端，集电极电性连接第一电阻的第二端；所述第三电阻的第二端接入高电压。
  6. 如权利要求2所述的公共电压调节电路，其中，所述预设的灰阶阈值大于100。
  7. 一种公共电压调节方法，包括如下步骤：
    步骤S1、接收电源电压，并利用电源电压产生参考电压；
    步骤S2、根据参考电压产生公共电压，并将公共电压输入显示面板；
    步骤S3、监测显示面板的待显示画面的灰阶变化，并根据待显示画面的灰阶变化判断公共电压是否需要补偿；
    步骤S4、在公共电压需要补偿时生成控制信号，并在所述控制信号的控制下调节所述参考电压，以补偿公共电压。
  8. 如权利要求7所述的公共电压调节方法，其中，所述步骤S4中在待显示画面中相邻两行子像素的灰阶变化超过预设的灰阶阈值时，确定公共电压需要补偿。
  9. 如权利要求8所述的公共电压调节方法，其中，所述步骤S4中，
    在所述公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从高往低变化时，生成第一控制信号，在所述第一控制信号的控制下，所述参考电压与一低电位相连，并被所述低电位拉低，所述公共电压被补偿保持稳定电位；
    在所述公共电压需要补偿，且待显示画面中相邻两行子像素的灰阶变化为从低往高变化时，生成第二控制信号，在所述第二控制信号的控制下，所述参考电压与一高电位相连，并被所述高电位拉高，所述公共电压被补偿保持稳定电位。
  10. 如权利要求8所述的公共电压调节方法，其中，所述预设的灰阶阈值大于100。
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