WO2020000746A1 - 公共电压反馈补偿电路、方法及平面显示装置 - Google Patents

公共电压反馈补偿电路、方法及平面显示装置 Download PDF

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Publication number
WO2020000746A1
WO2020000746A1 PCT/CN2018/108587 CN2018108587W WO2020000746A1 WO 2020000746 A1 WO2020000746 A1 WO 2020000746A1 CN 2018108587 W CN2018108587 W CN 2018108587W WO 2020000746 A1 WO2020000746 A1 WO 2020000746A1
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Prior art keywords
common voltage
feedback
circuit
input terminal
voltage
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PCT/CN2018/108587
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English (en)
French (fr)
Inventor
张先明
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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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Priority to US16/312,283 priority Critical patent/US11114052B2/en
Publication of WO2020000746A1 publication Critical patent/WO2020000746A1/zh
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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
    • 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
    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current

Definitions

  • the present invention relates to the field of display technology, and in particular, to a common voltage feedback compensation circuit, method, and flat display device.
  • the current of the common voltage VCOM of the common electrode used in the panel also gradually increases, and when the gray scale is switched, the common voltage VCOM will have a voltage drop in the panel, and even The interference caused by the gray-scale switching can greatly affect the size of the common voltage VCOM.
  • the common electrode common voltage VCOM compensation is a technology often used in the current display panel drive.
  • Figure 1 it is a schematic diagram of a conventional common voltage compensation circuit. Its basic principle As follows, the common point VCOM_FB is fed back at the feedback point in the display panel. The AC signal in it is connected to the inverting input terminal of the operational amplifier (OP) through the capacitor C1, and the common voltage compensation signal VCOM_OUT is introduced to perform the feedback to compensate The common voltage compensation signal VCOM_OUT is used as the compensated common voltage input to the display panel.
  • the non-inverting input terminal of the operational amplifier inputs the reference common voltage VCOM_Ref.
  • the reference common voltage VCOM_Ref can come from the power management circuit of the display panel. To solve the horizontal crosstalk problem.
  • an object of the present invention is to provide a common voltage feedback compensation circuit, method, and flat display device to solve the problem of overheating of feedback compensation caused by a common voltage ripple.
  • the present invention provides a common voltage feedback compensation circuit, including:
  • the switch selection circuit has a first input terminal for feeding back a common voltage, a second input terminal for inputting a first reference voltage, and a third input terminal for inputting a second reference voltage, and judges the received voltage from the display panel based on the first reference voltage and the second reference voltage. Feedback the range of the common voltage, and its output terminal outputs the corresponding switching signal according to the judgment result;
  • a switching circuit whose input terminal inputs a feedback common voltage, and whose output terminal is connected to an input terminal of a compensation circuit; the switching circuit is opened or closed according to the corresponding switching signal;
  • Attenuation circuit whose input terminal inputs the feedback common voltage, and the output terminal is connected to the input terminal of the compensation circuit; when the switch circuit is turned off, the feedback common voltage is input to the attenuation circuit, and after attenuation by the attenuation circuit, the attenuation feedback public is output to the compensation circuit. Voltage; when the switch circuit is closed, the feedback common voltage is directly input to the compensation circuit;
  • the input end of the compensation circuit is connected to the output end of the switching circuit and the attenuation circuit, and the output end outputs a common voltage compensation signal.
  • the switch selection circuit includes:
  • the first comparator the non-inverting input terminal receives the feedback common voltage
  • the inverting input terminal receives the first reference voltage
  • the output terminal outputs the first comparison result to the logic processor according to the comparison result between the feedback common voltage and the first reference voltage
  • the second comparator the inverting input terminal receives the feedback common voltage
  • the non-inverting input terminal receives the second reference voltage
  • the output terminal outputs the second comparison result to the logic processor according to the comparison result between the feedback common voltage and the second reference voltage
  • the logic processor has a first input terminal receiving a first comparison result, a second input terminal receiving a second comparison result, judging a range of the feedback common voltage according to the first comparison result and the second comparison result, and an output terminal outputting a corresponding switching signal To the switching circuit.
  • the attenuation circuit includes:
  • a first resistor one end of which is connected to the input terminal of the attenuation circuit, and the other end of which is connected to the non-inverting input terminal of the first operational amplifier;
  • a second resistor one end of which is connected to the non-inverting input end of the first operational amplifier, and the other end of which is grounded;
  • the first operational amplifier has an output terminal connected to its inverting input terminal and an output terminal of the attenuation circuit.
  • the compensation circuit includes:
  • One end of the capacitor is connected to the output end of the attenuation circuit, and the other end is connected to one end of the third resistor;
  • the other end of the third resistor is connected to the inverting input terminal of the second operational amplifier
  • a fourth resistor one end of which is connected to the inverting input terminal of the second operational amplifier, and the other end of which is connected to the output terminal of the second operational amplifier;
  • the second operational amplifier has a non-inverting input terminal inputting a reference common voltage, and an output terminal outputting a common voltage compensation signal.
  • the first reference voltage is smaller than the second reference voltage.
  • the logic processor is an AND gate unit.
  • the switch circuit when the feedback common voltage is greater than the first reference voltage and less than the second reference voltage, the switch circuit is closed; when the feedback common voltage is less than or equal to the first reference voltage, or greater than or equal to the second reference voltage, the switch circuit is turned off open.
  • the present invention also provides a flat display device including the common voltage feedback compensation circuit according to any one of the above.
  • the invention also provides a public voltage feedback compensation method, including:
  • the switch selection circuit determines the range of the feedback common voltage received from the display panel according to the first reference voltage and the second reference voltage;
  • the compensation circuit directly performs common voltage compensation according to the feedback common voltage
  • the attenuation circuit attenuates the feedback common voltage to obtain an attenuated feedback common voltage, and the compensation circuit compensates the common voltage according to the attenuated feedback common voltage.
  • the common voltage feedback compensation circuit, method and flat display device of the present invention increase the detection of the common voltage ripple.
  • the ripple is too large, the feedback common voltage will be reduced to deal with the ripple, which solves the problem caused by the common voltage ripple.
  • FIG. 1 is a schematic diagram of an existing common voltage compensation circuit
  • FIG. 2 is a schematic circuit diagram of a common voltage feedback compensation circuit according to the present invention.
  • FIG. 2 it is a schematic circuit diagram of a common voltage feedback compensation circuit according to the present invention.
  • the common voltage feedback compensation circuit of the present invention mainly includes: a switch selection circuit, a switch circuit, an attenuation circuit, and a compensation circuit.
  • the circuit shown in FIG. 2 is only used to illustrate the present invention, and those skilled in the art can make various other corresponding changes and modifications according to the technical solutions and technical concepts of the present invention.
  • the switch selection circuit is used to judge the range of the feedback common voltage VCOM_FB and output the corresponding switching signal; the first comparator OP3 and the second comparator OP4, and the logic processor are the main components of the switch selection circuit.
  • the feedback common voltage VCOM_FB is brought back from the feedback point in the display panel.
  • the first input terminal of the switch selection circuit inputs the feedback common voltage VCOM_FB, the second input terminal inputs the first reference voltage Vref1, and the third input terminal inputs the second reference voltage Vref2.
  • the switch selection circuit can compare the feedback common voltage VCOM_FB with the first reference voltage.
  • the relative magnitudes of Vref1 and the second reference voltage Vref2 are determined by determining the range of the feedback common voltage VCOM_FB before performing the common voltage compensation, and then generating a switching signal to control whether the feedback common voltage VCOM_FB is attenuated.
  • the switching circuit has an input terminal that feeds back the common voltage VCOM_FB, and the output terminal is connected to the input terminal of the compensation circuit.
  • the switching circuit is opened or closed according to the corresponding switching signal EN1, so as to control the opening or closing of the attenuation circuit.
  • the switching circuit can be a switching tube.
  • the input end and output end of the switching tube are respectively connected to the input end and the output end of the attenuation circuit, and the switching signal is input to the control end of the switching tube;
  • the switching tube may be NMOS, or other circuits or components that can achieve the same function. Take a switching circuit composed of NMOS as an example.
  • the switching circuit When the switching signal EN1 controls the NMOS to open, the switching circuit is closed and close to a short circuit, which is equivalent to closing the attenuation circuit connected in parallel with the switching circuit.
  • the switching signal EN1 controls the NMOS to be closed the switching circuit is turned off. Open, close to open circuit. At this time, the attenuation circuit connected in parallel with the switching circuit can attenuate the feedback common voltage VCOM_FB.
  • Attenuation circuit whose input terminal inputs the feedback common voltage VCOM_FB, and the output terminal is connected to the input of the compensation circuit; when the attenuation circuit is turned on, the feedback common voltage VCOM_FB is input to the attenuation circuit, and after attenuation by the attenuation circuit, the attenuation feedback common voltage is output to the compensation circuit.
  • VCOM_FB when the attenuation circuit is closed, the feedback common voltage VCOM_FB is directly input to the compensation circuit; the operational amplifier OP1 is the main component of the feedback common voltage VCOM_FB attenuation circuit.
  • the compensation circuit is used to compensate the common voltage. Its input is connected to the output of the switching circuit and the attenuation circuit at the same time. Therefore, the feedback common voltage VCOM_FB or the decayed feedback common voltage VCOM_FB can be input according to the state of the switching circuit. Voltage compensation signal VCOM_OUT.
  • the second operational amplifier OP2 is a main component of the common voltage VCOM feedback compensation circuit. The common voltage compensation signal VCOM_OUT is used for inputting the display panel as a compensated common voltage.
  • the invention increases the detection of the common voltage ripple. If the screen of the panel is under a heavy load screen, the ripple will be too large, then this state will be detected, and some ripple reduction will be performed on the feedback common voltage VCOM_FB. The wave is processed before feedback compensation.
  • the switch selection circuit may specifically include: a first comparator OP3 for comparing the feedback common voltage VCOM_FB and a first reference voltage Vref1, and the comparison result is output to the logic processor; and a second comparator OP4 for comparison The feedback common voltage VCOM_FB and the second reference voltage Vref2 are compared, and the comparison results of the first comparator OP3 and the second comparator OP4 are respectively output to the logic processor; the logic processor judges the range of the feedback common voltage VCOM_FB according to the comparison result, that is, the ripple Wave size, and output the corresponding switching signal to the switching circuit.
  • the preset first reference voltage Vref1 and the second reference voltage Vref2 are used to determine the magnitude of the ripple; the first reference voltage Vref1 is smaller than the second reference voltage Vref2; the first reference voltage Vref1 is input to the inverting input terminal of the first comparator OP3, The second reference voltage Vref2 is input to the non-inverting input terminal of the second comparator OP4.
  • the logic processor determines the magnitude of the ripple according to a preset logic.
  • the logic processor may be an AND gate unit.
  • the switching circuit When the feedback common voltage VCOM_FB is less than or equal to the first reference voltage Vref1 or greater than or equal to the second reference voltage Vref2, at this time the switching signal EN1 is at a low level, the switching circuit is turned off, and the attenuation circuit is turned on.
  • the feedback common voltage VCOM_FB will pass the attenuation first. The circuit is pre-processed, and then feedback will be performed after attenuation, which will not trigger thermal problems or even trigger over-current protection.
  • the attenuation circuit may specifically include: a first resistor R1, one end of which is connected to the input terminal of the attenuation circuit, and the other end of which is connected to the non-inverting input terminal of the operational amplifier OP1; The input end and the other end are grounded; the output end of the first operational amplifier OP1 is connected to its inverting input end and the output end of the attenuation circuit.
  • the present invention can also adopt other attenuation circuit forms suitable for attenuating the feedback common voltage VCOM_FB.
  • the compensation circuit may specifically include: a capacitor C1, one end of which is connected to the output terminal of the attenuation circuit, and the other end of which is connected to one end of the third resistor R3; the other end of the third resistor R3 is connected to the inverting of the second operational amplifier OP2 An input terminal; a fourth resistor R4, one end of which is connected to the inverting input terminal of the second operational amplifier OP2, and the other end of which is connected to the output terminal of the second operational amplifier OP2; the second operational amplifier OP2, whose non-inverting input terminal inputs the reference common voltage VCOM_Ref, Its output terminal outputs a common voltage compensation signal VCOM_OUT.
  • a capacitor C1 one end of which is connected to the output terminal of the attenuation circuit, and the other end of which is connected to one end of the third resistor R3
  • the other end of the third resistor R3 is connected to the inverting of the second operational amplifier OP2
  • An input terminal a fourth resistor R4,
  • the present invention also provides a corresponding flat display device including the above-mentioned common voltage feedback compensation circuit.
  • the invention also provides a public voltage feedback compensation method, which can be implemented based on the above-mentioned common voltage feedback compensation circuit and a flat display device.
  • This method uses pre-processing and judgment of public voltage feedback compensation to solve the overheating problem of public voltage feedback compensation in the prior art.
  • the method mainly includes:
  • the switch selection circuit determines the range of the feedback common voltage VCOM_FB received from the display panel according to the first reference voltage Vref1 and the second reference voltage Vref2; first, the ripple of the common voltage is determined according to the preset first reference voltage Vref1 and the second reference voltage Vref2. Wave range
  • the compensation circuit directly performs public voltage compensation according to the feedback common voltage VCOM_FB; when it is determined that the ripple of the current feedback common voltage VCOM_FB is small, the attenuation circuit can be turned off. Direct feedback
  • the attenuation circuit attenuates the feedback common voltage VCOM_FB to obtain the attenuated feedback common voltage VCOM_FB, and the compensation circuit performs Public voltage compensation; when it is determined that the ripple of the current feedback common voltage VCOM_FB is large, the attenuation circuit is turned on, and the public voltage compensation is performed by preprocessing through the attenuation circuit.
  • the common voltage feedback compensation circuit, method and flat display device of the present invention increase the detection of the common voltage ripple.
  • the ripple is too large, the feedback common voltage will be reduced to deal with the ripple, which solves the problem caused by the common voltage ripple.

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Abstract

一种公共电压反馈补偿电路、方法及平面显示装置，公共电压反馈补偿电路包括：开关选择电路，用于判断反馈公共电压(VCOM_FB)所处范围，输出相应的开关信号(EN1)；开关电路，用于根据相应的开关信号(EN1)打开或关闭衰减电路；衰减电路，当打开衰减电路时，反馈公共电压(VCOM_FB)输入衰减电路，经衰减电路衰减后向补偿电路输出衰减后的反馈公共电压(VCOM_FB)；当关闭衰减电路时，反馈公共电压(VCOM_FB)直接输入补偿电路；补偿电路，输入反馈公共电压(VCOM_FB)或者衰减后的反馈公共电压(VCOM_FB)，输出公共电压补偿信号(VCOM_OUT)，通过增加对公共电压纹波的侦测，当纹波过大时对反馈公共电压(VCOM_FB)做降纹波的处理，解决因公共电压纹波造成反馈补偿过热的问题。

Description

公共电压反馈补偿电路、方法及平面显示装置 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反馈补偿电路、方法及平面显示装置。
背景技术
随着显示面板尺寸的越来越大，面板中使用的公共电极的公共电压VCOM的电流也是逐渐变大，且在灰阶切换时，就会导致公共电压VCOM在面板内有压降，甚至在灰阶切换时导致的干扰可以很大幅度的影响公共电压VCOM的大小。
目前技术中很多是对公共电压VCOM做补偿，公共电极公共电压VCOM补偿是现有显示面板驱动经常使用到的技术，如图1所示，其为现有一种公共电压补偿电路示意图，其基本原理如下，在显示面板内反馈点引回反馈公共电压VCOM_FB，通过电容C1，将其中的交流信号接入到运算放大器(OP)的反相输入端，并引入公共电压补偿信号VCOM_OUT反向反馈进行补偿，公共电压补偿信号VCOM_OUT作为补偿后的公共电压输入显示面板，运算放大器同相输入端输入基准公共电压VCOM_Ref，基准公共电压VCOM_Ref可以来自于显示面板的电源管理电路，现有的公共电压补偿电路主要是为了解决水平串扰问题。
但是由于补偿的倍率是固定的，很容易就会造成在重载画面下，公共电压VCOM的纹波(Ripple)与电流非常大，补偿后导致电流更大，可能导致用于公共电压VCOM补偿的运算放大器过热，甚至于发生OCP(过流保护)。
发明内容
因此，本发明的目的在于提供一种公共电压反馈补偿电路、方法及平面显示装置，解决因公共电压纹波造成反馈补偿过热的问题。
为实现上述目的，本发明提供了一种公共电压反馈补偿电路，包括：
开关选择电路，其第一输入端输入反馈公共电压，第二输入端输入第一参考电压，第三输入端输入第二参考电压，根据第一参考电压和第二参考电压判断从显示面板接收的反馈公共电压所处范围，其输出端根据判断结果输出相应的开关信号；
开关电路，其输入端输入反馈公共电压，输出端连接补偿电路的输入端；所述开关电路根据所述相应的开关信号断开或闭合；
衰减电路，其输入端输入反馈公共电压，输出端连接补偿电路的输入端；当所述开关电路断开时，反馈公共电压输入衰减电路，经衰减电路衰减后向补偿电路输出衰减后的反馈公共电压；当所述开关电路闭合时，反馈公共电压直接输入补偿电路；
补偿电路，其输入端连接开关电路和衰减电路的输出端，输出端输出公共电压补偿信号。
其中，所述开关选择电路包括：
第一比较器，同相输入端接收反馈公共电压，反相输入端接收第一参考电压，输出端根据反馈公共电压和第一参考电压的比较结果输出第一比较结果至逻辑处理器；
第二比较器，反相输入端接收反馈公共电压，同相输入端接收第二参考电压，输出端根据反馈公共电压和第二参考电压的比较结果输出第二比较结果至逻辑处理器；
逻辑处理器，其第一输入端接收第一比较结果，第二输入端接收第二比较结果，根据第一比较结果和第二比较结果判断反馈公共电压所处范围，输出端输出相应的开关信号至开关电路。
其中，所述衰减电路包括：
第一电阻，其一端连接衰减电路的输入端，另一端连接第一运算放大器的同相输入端；
第二电阻，其一端连接第一运算放大器的同相输入端，另一端接地；
第一运算放大器，其输出端连接其反相输入端和衰减电路的输出端。
其中，所述补偿电路包括：
电容，其一端连接衰减电路的输出端，另一端连接第三电阻的一端；
第三电阻的另一端连接第二运算放大器的反相输入端；
第四电阻，其一端连接第二运算放大器的反相输入端，另一端连接第二运算放大器的输出端；
第二运算放大器，其同相输入端输入基准公共电压，其输出端输出公共电压补偿信号。
其中，所述第一参考电压小于第二参考电压。
其中，所述逻辑处理器为与门单元。
其中，当反馈公共电压大于第一参考电压且小于第二参考电压时，所述开关电路闭合；当反馈公共电压小于等于第一参考电压，或者大于等于 第二参考电压时，所述开关电路断开。
本发明还提供了一种平面显示装置，该平面显示装置包括上述任一项所述的公共电压反馈补偿电路。
本发明还提供了一种公共电压反馈补偿方法，包括：
开关选择电路根据第一参考电压和第二参考电压判断从显示面板接收的反馈公共电压所处范围；
若反馈公共电压大于第一参考电压且小于第二参考电压，补偿电路根据反馈公共电压直接进行公共电压补偿；
若反馈公共电压小于等于第一参考电压，或者大于等于第二参考电压，衰减电路衰减反馈公共电压得到衰减后的反馈公共电压，补偿电路根据衰减后的反馈公共电压进行公共电压补偿。
综上，本发明公共电压反馈补偿电路、方法及平面显示装置增加对公共电压纹波的侦测，当纹波过大时会对反馈公共电压做降纹波的处理，解决因公共电压纹波造成反馈补偿过热的问题。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为一种现有公共电压补偿电路示意图；
图2为本发明公共电压反馈补偿电路的电路原理示意图。
具体实施方式
参见图2，其为本发明公共电压反馈补偿电路的电路原理示意图。本发明公共电压反馈补偿电路主要包括：开关选择电路，开关电路，衰减电路，以及补偿电路。图2所示电路仅用于举例说明本发明，本领域技术人员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。
开关选择电路，用于判断反馈公共电压VCOM_FB所处范围，输出相应的开关信号；第一比较器OP3和第二比较器OP4，以及逻辑处理器即为开关选择电路的主要组成部分。反馈公共电压VCOM_FB自显示面板内反馈点引回。开关选择电路的第一输入端输入反馈公共电压VCOM_FB，第二输入端输入第一参考电压Vref1，第三输入端输入第二参考电压Vref2，开关选择电路可以比较反馈公共电压VCOM_FB与第一参考电压Vref1和第二参考电压Vref2的相对大小，在进行公共电压补偿之前先通过判断反馈 公共电压VCOM_FB所处范围来判断纹波大小，进而生成开关信号以控制是否进行反馈公共电压VCOM_FB的衰减。
开关电路，其输入端输入反馈公共电压VCOM_FB，输出端连接补偿电路的输入端；开关电路根据相应的开关信号EN1断开或闭合，从而控制打开或关闭衰减电路；开关电路具体可以为一开关管，开关管的输入端和输出端分别连接衰减电路的输入端和输出端，开关信号输入开关管的控制端；开关管可以为NMOS，或者其他可以实现相同功能的电路或元件。以NMOS组成的开关电路为例，当开关信号EN1控制NMOS打开时，开关电路闭合，接近于短路，相当于关闭了与开关电路并联的衰减电路；当开关信号EN1控制NMOS关闭时，开关电路断开，接近于断路，此时与开关电路并联的衰减电路可以对反馈公共电压VCOM_FB进行衰减。
衰减电路，其输入端输入反馈公共电压VCOM_FB，输出端连接补偿电路的输入端；当打开衰减电路时，反馈公共电压VCOM_FB输入衰减电路，经衰减电路衰减后向补偿电路输出衰减后的反馈公共电压VCOM_FB；当关闭衰减电路时，反馈公共电压VCOM_FB直接输入补偿电路；运算放大器OP1即为反馈公共电压VCOM_FB衰减电路的主要组成部分。
补偿电路，用于补偿公共电压，其输入端同时连接开关电路和衰减电路的输出端，因而可以根据开关电路的状态输入反馈公共电压VCOM_FB或者衰减后的反馈公共电压VCOM_FB，补偿电路输出端输出公共电压补偿信号VCOM_OUT。第二运算放大器OP2为公共电压VCOM反馈补偿电路的主要组成部分。公共电压补偿信号VCOM_OUT作为补偿后的公共电压用于输入显示面板。
本发明增加对公共电压纹波的侦测，如果面板的画面在重载画面下，由于纹波过大，那么此时就会侦测到这种状态，会对反馈公共电压VCOM_FB做一些降纹波的处理，而后才会进行反馈补偿。
在此实施例中，开关选择电路具体可以包括：第一比较器OP3，用于比较反馈公共电压VCOM_FB和第一参考电压Vref1，比较结果输出至逻辑处理器；第二比较器OP4，用于比较反馈公共电压VCOM_FB和第二参考电压Vref2，第一比较器OP3和第二比较器OP4的比较结果分别输出至逻辑处理器；由逻辑处理器根据比较结果判断反馈公共电压VCOM_FB所处范围，即纹波大小，并输出相应的开关信号至开关电路。
预设的第一参考电压Vref1和第二参考电压Vref2用于判定纹波大小；第一参考电压Vref1小于第二参考电压Vref2；第一参考电压Vref1输入第一比较器OP3的反相输入端，第二参考电压Vref2输入第二比较器OP4的 同相输入端。逻辑处理器根据预设的逻辑判定纹波大小，在此实施例中，逻辑处理器可以为与门单元。
先通过开关选择电路判断公共电压的纹波所处范围，当反馈公共电压VCOM_FB大于第一参考电压Vref1且小于第二参考电压Vref2时，即认为目前反馈公共电压VCOM_FB的纹波较小，可以直接做反馈，这个时候开关信号EN1为高电平，开关电路闭合，衰减电路关闭，直接做公共电压补偿。
当反馈公共电压VCOM_FB小于等于第一参考电压Vref1，或者大于等于第二参考电压Vref2时，这个时候开关信号EN1为低电平，开关电路断开，衰减电路打开，反馈公共电压VCOM_FB会先通过衰减电路预处理，衰减之后才会进行反馈，不会触发热的问题，甚至于触发过流保护。
在此实施例中，衰减电路具体可以包括：第一电阻R1，其一端连接衰减电路的输入端，另一端连接运算放大器OP1的同相输入端；第二电阻R2，其一端连接运算放大器OP1的同相输入端，另一端接地；第一运算放大器OP1，其输出端连接其反相输入端和衰减电路的输出端。本发明也可以采用其他适合衰减反馈公共电压VCOM_FB的衰减电路形式。
在此实施例中，补偿电路具体可以包括：电容C1，其一端连接衰减电路的输出端，另一端连接第三电阻R3的一端；第三电阻R3的另一端连接第二运算放大器OP2的反相输入端；第四电阻R4，其一端连接第二运算放大器OP2的反相输入端，另一端连接第二运算放大器OP2的输出端；第二运算放大器OP2，其同相输入端输入基准公共电压VCOM_Ref，其输出端输出公共电压补偿信号VCOM_OUT。补偿电路的工作过程可参照图1所示现有公共电压补偿电路。
基于上述公共电压反馈补偿电路，本发明还提供了相应的平面显示装置，包含上述公共电压反馈补偿电路。
本发明还提供了公共电压反馈补偿方法，可以基于上述公共电压反馈补偿电路及平面显示装置实施。该方法采用公共电压反馈补偿的预处理及判定，解决现有技术公共电压反馈补偿过热的问题，该方法主要包括：
开关选择电路根据第一参考电压Vref1和第二参考电压Vref2判断从显示面板接收的反馈公共电压VCOM_FB所处范围；首先根据预设的第一参考电压Vref1和第二参考电压Vref2判断公共电压的纹波范围；
若反馈公共电压VCOM_FB大于第一参考电压Vref1且小于第二参考电压Vref2，补偿电路根据反馈公共电压VCOM_FB直接进行公共电压补偿；当判定目前反馈公共电压VCOM_FB的纹波较小时，可以关闭衰减电路， 直接做反馈；
若反馈公共电压VCOM_FB小于等于第一参考电压Vref1，或者大于等于第二参考电压Vref2，衰减电路衰减反馈公共电压VCOM_FB得到衰减后的反馈公共电压VCOM_FB后，补偿电路根据衰减后的反馈公共电压VCOM_FB进行公共电压补偿；当判定目前反馈公共电压VCOM_FB的纹波较大时，打开衰减电路，先通过衰减电路预处理再进行公共电压补偿。
综上，本发明公共电压反馈补偿电路、方法及平面显示装置增加对公共电压纹波的侦测，当纹波过大时会对反馈公共电压做降纹波的处理，解决因公共电压纹波造成反馈补偿过热的问题。
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后附的权利要求的保护范围。

Claims (10)

  1. 一种公共电压反馈补偿电路，包括：
    开关选择电路，其第一输入端输入反馈公共电压，第二输入端输入第一参考电压，第三输入端输入第二参考电压，根据第一参考电压和第二参考电压判断从显示面板接收的反馈公共电压所处范围，其输出端根据判断结果输出相应的开关信号；
    开关电路，其输入端输入反馈公共电压，输出端连接补偿电路的输入端；所述开关电路根据所述相应的开关信号断开或闭合；
    衰减电路，其输入端输入反馈公共电压，输出端连接补偿电路的输入端；当所述开关电路断开时，反馈公共电压输入衰减电路，经衰减电路衰减后向补偿电路输出衰减后的反馈公共电压；当所述开关电路闭合时，反馈公共电压直接输入补偿电路；
    补偿电路，其输入端连接开关电路和衰减电路的输出端，输出端输出公共电压补偿信号。
  2. 如权利要求1所述的公共电压反馈补偿电路，其中，所述开关选择电路包括：
    第一比较器，同相输入端接收反馈公共电压，反相输入端接收第一参考电压，输出端根据反馈公共电压和第一参考电压的比较结果输出第一比较结果至逻辑处理器；
    第二比较器，反相输入端接收反馈公共电压，同相输入端接收第二参考电压，输出端根据反馈公共电压和第二参考电压的比较结果输出第二比较结果至逻辑处理器；
    逻辑处理器，其第一输入端接收第一比较结果，第二输入端接收第二比较结果，根据第一比较结果和第二比较结果判断反馈公共电压所处范围，输出端输出相应的开关信号至开关电路。
  3. 如权利要求1所述的公共电压反馈补偿电路，其中，所述开关电路包括开关管，所述开关管的输入端和输出端分别连接衰减电路的输入端和输出端，所述开关信号输入所述开关管的控制端。
  4. 如权利要求1所述的公共电压反馈补偿电路，其中，所述衰减电路包括：
    第一电阻，其一端连接衰减电路的输入端，另一端连接第一运算放大器的同相输入端；
    第二电阻，其一端连接第一运算放大器的同相输入端，另一端接地；
    第一运算放大器，其输出端连接其反相输入端和衰减电路的输出端。
  5. 如权利要求1所述的公共电压反馈补偿电路，其中，所述补偿电路包括：
    电容，其一端连接衰减电路的输出端，另一端连接第三电阻的一端；
    第三电阻的另一端连接第二运算放大器的反相输入端；
    第四电阻，其一端连接第二运算放大器的反相输入端，另一端连接第二运算放大器的输出端；
    第二运算放大器，其同相输入端输入基准公共电压，其输出端输出公共电压补偿信号。
  6. 如权利要求2所述的公共电压反馈补偿电路，其中，所述第一参考电压小于第二参考电压。
  7. 如权利要求6所述的公共电压反馈补偿电路，其中，所述逻辑处理器为与门单元。
  8. 如权利要求6所述的公共电压反馈补偿电路，其中，当反馈公共电压大于第一参考电压且小于第二参考电压时，所述开关电路闭合；当反馈公共电压小于等于第一参考电压，或者大于等于第二参考电压时，所述开关电路断开。
  9. 一种平面显示装置，包括如权利要求1所述的公共电压反馈补偿电路。
  10. 一种公共电压反馈补偿方法，包括：
    开关选择电路根据第一参考电压和第二参考电压判断从显示面板接收的反馈公共电压所处范围；
    若反馈公共电压大于第一参考电压且小于第二参考电压，补偿电路根据反馈公共电压直接进行公共电压补偿；
    若反馈公共电压小于等于第一参考电压，或者大于等于第二参考电压，衰减电路衰减反馈公共电压得到衰减后的反馈公共电压，补偿电路根据衰减后的反馈公共电压进行公共电压补偿。
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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107578752B (zh) * 2017-09-20 2019-07-05 京东方科技集团股份有限公司 公共电压校准电路、电路板及显示装置
CN209748513U (zh) * 2018-12-12 2019-12-06 北京集创北方科技股份有限公司 开关电路及信号采集系统
CN109616043B (zh) * 2019-02-15 2022-04-19 京东方科技集团股份有限公司 一种电压控制电路及其控制方法、显示装置
CN111243537B (zh) * 2020-01-16 2022-03-01 昆山龙腾光电股份有限公司 公共电压发生电路、方法及显示装置
TWI771774B (zh) * 2020-10-20 2022-07-21 大陸商北京集創北方科技股份有限公司 偏置電壓補償電路、oled顯示裝置及資訊處理裝置
CN112885307B (zh) * 2021-01-18 2022-07-12 深圳市华星光电半导体显示技术有限公司 一种显示面板、显示面板的电压调节方法及显示装置
CN114639360B (zh) * 2022-03-01 2023-04-07 深圳市华星光电半导体显示技术有限公司 显示面板及显示装置
CN116312406A (zh) * 2023-01-31 2023-06-23 惠科股份有限公司 公共电压补偿电路及显示装置
CN116682354B (zh) * 2023-06-29 2026-04-21 昆山龙腾光电股份有限公司 一种电压调节装置和方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100277399A1 (en) * 2009-05-04 2010-11-04 Hui-Lung Yu Common-voltage compensation circuit and compensation method for use in a liquid crystal display
CN102842280A (zh) * 2012-08-31 2012-12-26 京东方科技集团股份有限公司 一种公共电压补偿电路、方法及液晶显示装置
CN105513527A (zh) * 2016-02-03 2016-04-20 京东方科技集团股份有限公司 一种公共电压补偿电路、补偿方法及显示面板
CN105632395A (zh) * 2016-02-04 2016-06-01 京东方科技集团股份有限公司 一种公共电极电压的补偿电路和显示装置
CN105654888A (zh) * 2016-02-04 2016-06-08 京东方科技集团股份有限公司 一种公共电极电压的补偿电路和显示装置
CN108172190A (zh) * 2018-01-15 2018-06-15 深圳市华星光电技术有限公司 用于液晶显示器的放大电路

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007147959A (ja) * 2005-11-28 2007-06-14 Nec Lcd Technologies Ltd Ｌｃｄパネルの駆動回路
KR101200966B1 (ko) * 2006-01-19 2012-11-14 삼성디스플레이 주식회사 공통 전압 생성 회로 및 이를 포함하는 액정 표시 장치
CN203825080U (zh) * 2014-03-10 2014-09-10 广东易事特电源股份有限公司 一种ad电压调理电路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100277399A1 (en) * 2009-05-04 2010-11-04 Hui-Lung Yu Common-voltage compensation circuit and compensation method for use in a liquid crystal display
CN102842280A (zh) * 2012-08-31 2012-12-26 京东方科技集团股份有限公司 一种公共电压补偿电路、方法及液晶显示装置
CN105513527A (zh) * 2016-02-03 2016-04-20 京东方科技集团股份有限公司 一种公共电压补偿电路、补偿方法及显示面板
CN105632395A (zh) * 2016-02-04 2016-06-01 京东方科技集团股份有限公司 一种公共电极电压的补偿电路和显示装置
CN105654888A (zh) * 2016-02-04 2016-06-08 京东方科技集团股份有限公司 一种公共电极电压的补偿电路和显示装置
CN108172190A (zh) * 2018-01-15 2018-06-15 深圳市华星光电技术有限公司 用于液晶显示器的放大电路

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