WO2020124769A1 - 显示面板驱动电路 - Google Patents

显示面板驱动电路 Download PDF

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Publication number
WO2020124769A1
WO2020124769A1 PCT/CN2019/075583 CN2019075583W WO2020124769A1 WO 2020124769 A1 WO2020124769 A1 WO 2020124769A1 CN 2019075583 W CN2019075583 W CN 2019075583W WO 2020124769 A1 WO2020124769 A1 WO 2020124769A1
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Prior art keywords
voltage
electrically connected
module
feedback
gate
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PCT/CN2019/075583
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English (en)
French (fr)
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金锦
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深圳市华星光电半导体显示技术有限公司
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Publication of WO2020124769A1 publication Critical patent/WO2020124769A1/zh

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Classifications

    • 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
    • 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
    • G09G2320/0257—Reduction of after-image effects

Definitions

  • the present invention relates to the field of display technology, and in particular to a display panel drive circuit.
  • liquid crystal display Liquid Crystal Display
  • LCD Liquid Crystal Display
  • other flat display devices are widely used in mobile phones, TVs, etc. due to their advantages of high image quality, power saving, thin body and wide range of applications.
  • Various consumer electronic products such as personal digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream in display devices.
  • liquid crystal display devices on the existing market are backlight type liquid crystal displays, which include a liquid crystal display panel and a backlight module.
  • the working principle of the liquid crystal display panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal thin wires in the middle of the two glass substrates.
  • the liquid crystal molecules are controlled to change the direction by turning on or off, and the light of the backlight module is controlled. Refracted to produce a picture.
  • the liquid crystal display panel is composed of a color filter substrate (Color Filter Substrate, CF Substrate) and a thin film transistor array substrate (Thin Film Transistor Array Substrate, TFT Array Substrate) and a liquid crystal layer (Liquid Crystal Layer) disposed between the two substrates.
  • pixel electrodes and common electrodes are provided on the array substrate and the color filter substrate, respectively. When a voltage is applied to the pixel electrode and the common electrode, an electric field is generated in the liquid crystal layer. The electric field determines the orientation of the liquid crystal molecules, thereby adjusting the polarization of the light incident on the liquid crystal layer and causing the liquid crystal panel to display an image.
  • VGH gate-on voltage
  • VGL gate-off voltage
  • the object of the present invention is to provide a display panel driving circuit, which can increase the magnitude of the gate-on voltage when the display panel is turned off and discharged, to realize the rapid discharge of pixels, and to avoid the afterimage of shutdown.
  • the present invention provides a display panel driving circuit, including: an output module, a feedback module electrically connected to the output module, and a control module electrically connected to both the output module and the feedback module ;
  • the output module is used to receive an input voltage and use the input voltage to generate and output a gate-on voltage
  • the feedback module is used to receive the gate-on voltage and control voltage, and generate a feedback voltage according to the gate-on voltage and control voltage;
  • the control module is used to receive the reference voltage and the feedback voltage, compare the reference voltage and the feedback voltage, and control the magnitude of the gate-on voltage output by the output module according to the comparison result;
  • the control voltage is switched from the first voltage value to the second voltage value to change the feedback voltage and the comparison result of the reference voltage and the feedback voltage, so that the control module controls the output
  • the gate-on voltage of the module output increases.
  • the feedback module includes: a first resistor, a second resistor, a third resistor, and a first MOS tube;
  • the first end of the first resistor receives the gate-on voltage, and the second end is electrically connected to the first node;
  • the first end of the second resistor is grounded, and the second end is electrically connected to the first node;
  • the first end of the third resistor is electrically connected to the first node, and the second end is electrically connected to the drain of the first MOS tube;
  • the gate of the first MOS tube receives the control voltage, and the source is grounded;
  • the feedback module outputs a feedback voltage from the first node.
  • the feedback module further includes a first diode, an anode of the first diode is electrically connected to the source of the first MOS tube, and a cathode is electrically connected to the drain of the first MOS tube.
  • the output module includes: an inductor, a second diode, a first capacitor, a second MOS tube, and a fourth resistor;
  • the first end of the inductor receives the input voltage, and the second end is electrically connected to the second node;
  • the anode of the second diode is electrically connected to the second node, and the cathode is electrically connected to the third node;
  • the first end of the first capacitor is electrically connected to the third node, and the second end is grounded;
  • the gate of the second MOS tube is electrically connected to the control module, the source is electrically connected to the first end of the fourth resistor, and the drain is electrically connected to the second node;
  • the second end of the fourth resistor is grounded
  • the output module outputs the gate-on voltage from the third node to the feedback module.
  • the output module further includes a second capacitor.
  • the first end of the second capacitor is electrically connected to the first end of the inductor, and the second end is grounded.
  • the control module includes a comparator and a PWM controller
  • the non-inverting input of the comparator receives the reference voltage, the inverting input receives the feedback voltage from the first node, and the output is electrically connected to the input of the PWM controller;
  • the output terminal of the PWM controller is electrically connected to the gate of the second MOS tube.
  • control module controls the gate-on voltage output by the output module to increase until the reference voltage is equal to the feedback voltage.
  • the first MOS tube is an NMOS tube, and the second voltage value is greater than the first voltage value.
  • the output terminal of the PWM controller outputs a switching pulse signal to the gate of the second MOS tube to control the opening and closing of the second MOS tube.
  • the comparator and the PWM controller are integrated in a control chip.
  • the present invention provides a display panel driving circuit, including: an output module, a feedback module electrically connected to the output module, and a control electrically connected to the output module and the feedback module
  • the output module is used to receive an input voltage and use the input voltage to generate and output a gate-on voltage
  • the feedback module is used to receive the gate-on voltage and control voltage, and according to the gate The turn-on voltage and the control voltage generate a feedback voltage
  • the control module is used to receive the reference voltage and the feedback voltage, compare the reference voltage and the feedback voltage, and control the gate-on voltage output by the output module according to the comparison result Size; when the display panel is turned off and discharged, the control voltage is switched from the first voltage value to the second voltage value to change the feedback voltage and the comparison result of the reference voltage and the feedback voltage, so that the control module controls the The on-voltage of the gate output by the output module is increased, so as to realize the rapid discharge of the pixels and avoid the afterimage of shutdown.
  • FIG. 1 is a block diagram of a display panel driving circuit of the present invention
  • FIG. 2 is a circuit diagram of a display panel driving circuit of the present invention
  • FIG. 3 is a waveform diagram of a display panel driving circuit of the present invention.
  • the present invention provides a display panel driving circuit, including: an output module 10 , And the output module 10 Electrically connected feedback module 20 And with the output module 10 And the feedback module 20 Equally connected control module 30 ;
  • the output module 10 Used to receive input voltage Vin And use the input voltage Vin Generate and output gate-on voltage VGH ;
  • the feedback module 20 For receiving the gate-on voltage VGH And control voltage VSS , And according to the gate-on voltage VGH And control voltage VSS Generate feedback voltage Vfb ;
  • the control module 30 Used to receive reference voltage Vref And feedback voltage Vfb And compare the reference voltage Vref And feedback voltage Vfb And control the output module according to the comparison result 10 Output gate-on voltage VGH the size of;
  • the feedback module 20 Including: first resistance R1 ⁇ Second resistance R2 , The third resistance R3 And first MOS tube Q1 ;
  • the first resistance R1 The first terminal receives the gate-on voltage VGH , The second end is electrically connected to the first node A ;
  • the second resistance R2 The first end is grounded, and the second end is electrically connected to the first node A ;
  • the third resistor R3 The first end of the is electrically connected to the first node A ,
  • the second end is electrically connected to the first MOS tube Q1 Of the drain;
  • the first MOS tube Q1 Gate receives control voltage VSS , The source is grounded; the feedback module 20 From the first node A Output feedback voltage Vfb .
  • the feedback module 20 also includes the first diode D1 ,
  • the first diode D1 Is connected to the positive electrode first MOS tube Q1 Source, the negative electrode is electrically connected first MOS tube Q1 Of the drain.
  • the output module 10 Including: inductance L1 , Second diode D2 , The first capacitor C1 ,second MOS tube Q2 4th resistance R4 ;
  • the inductance L1 The first terminal receives the input voltage Vin , The second end is electrically connected to the second node B ;
  • the second diode D2 The anode of the is electrically connected to the second node B ,
  • the negative electrode is electrically connected to the third node C ;
  • the first capacitor C1 The first end is electrically connected to the third node C , The second end is grounded; the second MOS tube Q2
  • the grid is electrically connected to the control module 30 ,
  • the source is electrically connected to the fourth resistor R4 At the first end, the drain is electrically connected to the second node B ;
  • the fourth resistor R4 The second end of the ground;
  • the output module 10 From the third node C Feedback module 20 Output gate turn-on voltage VGH .
  • the output module 10 also includes the second capacitor C2 , The second capacitor C2 The first end is electrically connected to the inductor L1 The first end, the second end is grounded.
  • control module 30 Includes comparator F1 And pulse width modulation ( Pulse Width Modulation , PWM ) Controller 301 ;
  • the comparator F1 Of the non-inverting input receives the reference voltage Vref , The reverse input ends from the first node A Receive feedback voltage Vfb ,
  • the output terminal is electrically connected PWM Controller 301 Of the input; PWM Controller 301
  • the output terminal is electrically connected to the second MOS tube Q2 Gate.
  • comparator F1 and PWM Controller 301 All are integrated in a control chip.
  • the first MOS tube Q1 for NMOS The second voltage value is greater than the first voltage value.
  • the control module 30 Receive reference voltage Vref And feedback voltage Vfb And output switching pulse signal VP , Control the second MOS tube Q2 Switch in the second MOS tube Q2 When turned on, the second diode D1 Cutoff, the input voltage Vin Inductance L1 Charging makes the inductance L1 The current in L1 Energy storage, in the second MOS tube Q2 When closed, the inductance L1 Through the second diode D1 Is the first capacitor C1 Charging so that the third node C Output gate turn-on voltage VGH , The switching pulse signal VP Control the second MOS tube Q2 Repeatedly switching to continuously output the gate-on voltage VGH .
  • the switching pulse signal VP The duty cycle change the second MOS tube Q2 Switching frequency, thereby changing the output module 10 Output gate-on voltage VGH
  • the size of the pulse signal VP The greater the duty cycle of the VGH The larger, the control module 30 According to the reference voltage Vref And feedback voltage Vfb
  • the comparison result adjusts the pulse signal VP Duty cycle when the reference voltage Vref Greater than the feedback voltage Vfb ,
  • the control module 30 Boost the pulse signal VP Of the duty cycle, making the gate turn-on voltage VGH Increase until the reference voltage Vref Equal to the feedback voltage Vfb ,
  • the control module 30 Lower the pulse signal VP Of the duty cycle, making the gate turn-on voltage VGH Decrease until the reference voltage Vref Equal to the feedback voltage Vfb .
  • the display panel driving circuit of the present invention includes two working stages, namely a normal display stage and a shutdown discharge stage, wherein in the normal display stage, the control voltage VSS Controlling the first voltage value MOS tube Q1 Cutoff, the feedback voltage Vfb Gate-on voltage VGH Through the first resistor in series R1 And the second resistor R2 Obtained by partial pressure, the gate-on voltage VGH equal: Vref ⁇ (1+R1/R2) , Feedback voltage Vfb Equal to reference voltage Vref ;
  • the control voltage VSS Switch to the second voltage value to control the first MOS tube Q1 On, third resistance R3 Is connected in parallel to the second resistor R2 Both ends of the first node A Output feedback voltage Vfb Down, the control module 10
  • the feedback voltage is detected Vfb Drop, which in turn makes the feedback voltage Vfb And reference voltage Vref
  • the comparison result becomes the feedback voltage Vfb Less than reference voltage Vref ,
  • the present invention provides a display panel driving circuit, including: an output module, a feedback module electrically connected to the output module, and a control module electrically connected to the output module and the feedback module
  • the output module is used to receive an input voltage and use the input voltage to generate and output a gate-on voltage
  • the feedback module is used to receive the gate-on voltage and control voltage, and according to the gate conduction
  • the feedback voltage is generated by the turn-on voltage and the control voltage
  • the control module is used to receive the reference voltage and the feedback voltage, compare the reference voltage and the feedback voltage, and control the magnitude of the gate-on voltage output by the output module according to the comparison result ;
  • the control voltage is switched from the first voltage value to the second voltage value to change the feedback voltage and the comparison result of the reference voltage and the feedback voltage, so that the control module controls the The on-voltage of the gate output by the output module is increased to realize the rapid discharge of the pixels and avoid the afterimage of shutdown.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种显示面板驱动电路，包括：输出模块（10）、与输出模块（10）电性连接的反馈模块（20）以及与输出模块（10）及反馈模块（20）均电性连接的控制模块（30）；所述输出模块（10）用于接收输入电压（Vin）并利用输入电压（Vin）产生并输出栅极导通电压（VGH）；所述反馈模块（20）用于接收栅极导通电压（VGH）及控制电压（VSS），并根据栅极导通电压（VGH）及控制电压（VSS）产生反馈电压（Vfb）；所述控制模块（30）用于接收参考电压（Vref）及及反馈电压（Vfb），根据参考电压（Vref）及反馈电压（Vfb）的比较结果控制输出模块（10）输出的栅极导通电压（VGH）的大小；在显示面板关机放电时，控制电压（VSS）从第一电压值切换至第二电压值，以改变反馈电压（Vfb）以及参考电压（Vref）及与反馈电压（Vfb）的比较结果，使得控制模块（30）控制输出模块（10）输出的栅极导通电压（VGH）升高，以实现像素的快速放电，避免关机残影。

Description

显示面板驱动电路 技术领域
本发明涉及显示技术领域，尤其涉及一种显示面板驱动电路。
 背景技术
随着显示技术的发展，液晶显示装置（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）。液晶显示面板的工作原理是在两片平行的玻璃基板当中放置液晶分子，两片玻璃基板中间有许多垂直和水平的细小电线，通过通电与否来控制液晶分子改变方向，将背光模组的光线折射出来产生画面。
进一步地，液晶显示面板是由一彩色滤光片基板（Color Filter Substrate，CF Substrate）、一薄膜晶体管阵列基板（Thin Film Transistor Array Substrate，TFT Array Substrate）以及一配置于两基板间的液晶层（Liquid Crystal Layer）所构成。一般阵列基板、彩色滤光片基板上分别设置像素电极、公共电极。当电压被施加到像素电极与公共电极便会在液晶层中产生电场，该电场决定了液晶分子的取向，从而调整入射到液晶层的光的偏振，使液晶面板显示图像。
在对TFT-LCD进行驱动时，需要向TFT-LCD输入包括栅极导通电压（VGH）及栅极关闭电压（VGL）在内的多种电压。其中，栅极导通电压用于驱动显示面板内各个像素的开关TFT打开，以对各个像素进行充电，实现画面显示，现有技术中，在液晶显示面板的关机时，栅极导通电压（VGH）会随着关机而降低，而此时各个像素均为带电状态，栅极导通电压（VGH）的降低会导致各个像素无法及时放电，进而导致关机残影的出现。
 技术问题
本发明的目的在于提供一种显示面板驱动电路，能够在显示面板关机放电时，提升栅极导通电压的大小，实现像素的快速放电，避免关机残影。
 技术解决方案
为实现上述目的，本发明提供了一种显示面板驱动电路，包括：输出模块、与所述输出模块电性连接的反馈模块以及与所述输出模块及所述反馈模块均电性连接的控制模块；
所述输出模块用于接收输入电压并利用所述输入电压产生并输出栅极导通电压；
所述反馈模块用于接收所述栅极导通电压及控制电压，并根据所述栅极导通电压及控制电压产生反馈电压；
所述控制模块用于接收参考电压及反馈电压，并比较所述参考电压及反馈电压，并根据比较结果控制所述输出模块输出的栅极导通电压的大小；
在显示面板关机放电时，所述控制电压从第一电压值切换至第二电压值，以改变所述反馈电压以及所述参考电压与反馈电压的比较结果，使得所述控制模块控制所述输出模块输出的栅极导通电压升高。
所述反馈模块包括：第一电阻、第二电阻、第三电阻及第一MOS管；
所述第一电阻的第一端接收栅极导通电压，第二端电性连接第一节点；
所述第二电阻的第一端接地，第二端电性连接第一节点；
所述第三电阻的第一端电性连接第一节点，第二端电性连接第一MOS管的漏极；
所述第一MOS管的栅极接收控制电压，源极接地；
所述反馈模块从第一节点输出反馈电压。
所述反馈模块还包括第一二极管，所述第一二极管的正极电性连接第一MOS管的源极，负极电性连接第一MOS管的漏极。
所述输出模块包括：电感、第二二极管、第一电容、第二MOS管及第四电阻；
所述电感的第一端接收输入电压，第二端电性连接第二节点；
所述第二二极管的正极电性连接第二节点，负极电性连接第三节点；
所述第一电容的第一端电性连接第三节点，第二端接地；
所述第二MOS管的栅极电性连接控制模块，源极电性连接第四电阻的第一端，漏极电性连接第二节点；
所述第四电阻的第二端接地；
所述输出模块从第三节点向反馈模块输出栅极导通电压。
所述输出模块还包括第二电容，所述第二电容的第一端电性连接电感的第一端，第二端接地。
所述控制模块包括比较器及PWM控制器；
所述比较器的同相输入端接收参考电压，反向输入端从第一节点接收反馈电压，输出端电性连接PWM控制器的输入端；
所述PWM控制器的输出端电性连接第二MOS管的栅极。
在显示面板关机放电时，所述控制模块控制所述输出模块输出的栅极导通电压升高，直至所述参考电压与反馈电压相等。
所述第一MOS管为NMOS管，所述第二电压值大于第一电压值。
所述PWM控制器的输出端向所述第二MOS管的栅极输出开关脉冲信号，以控制所述第二MOS管的开闭。
所述比较器及PWM控制器集成于一控制芯片中。
 有益效果
本发明的有益效果：本发明提供了一种显示面板驱动电路，包括：输出模块、与所述输出模块电性连接的反馈模块以及与所述输出模块及所述反馈模块均电性连接的控制模块；所述输出模块用于接收输入电压并利用所述输入电压产生并输出栅极导通电压；所述反馈模块用于接收所述栅极导通电压及控制电压，并根据所述栅极导通电压及控制电压产生反馈电压；所述控制模块用于接收参考电压及反馈电压，并比较所述参考电压及反馈电压，并根据比较结果控制所述输出模块输出的栅极导通电压的大小；在显示面板关机放电时，所述控制电压从第一电压值切换至第二电压值，以改变所述反馈电压以及所述参考电压与反馈电压的比较结果，使得所述控制模块控制所述输出模块输出的栅极导通电压升高，以实现像素的快速放电，避免关机残影。
 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为本发明的显示面板驱动电路的模块图；
图2为本发明的显示面板驱动电路的电路图；
图3为本发明的显示面板驱动电路的波形图。
 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。
请参阅图 1 ，本发明提供一种显示面板驱动电路，包括：输出模块 10 、与所述输出模块 10 电性连接的反馈模块 20 以及与所述输出模块 10 及所述反馈模块 20 均电性连接的控制模块 30 ；
所述输出模块 10 用于接收输入电压 Vin 并利用所述输入电压 Vin 产生并输出栅极导通电压 VGH ；
所述反馈模块 20 用于接收所述栅极导通电压 VGH 及控制电压 VSS ，并根据所述栅极导通电压 VGH 及控制电压 VSS 产生反馈电压 Vfb ；
所述控制模块 30 用于接收参考电压 Vref 及反馈电压 Vfb ，并比较所述参考电压 Vref 及反馈电压 Vfb ，并根据比较结果控制所述输出模块 10 输出的栅极导通电压 VGH 的大小；
在显示面板关机放电时，所述控制电压 VSS 从第一电压值切换至第二电压值，以改变所述反馈电压 Vfb 以及所述参考电压 Vref 与反馈电压 Vfb 的比较结果，使得所述控制模块 30 控制所述输出模块 10 输出的栅极导通电压 VGH 升高。
具体地，如图 2 所示，所述反馈模块 20 包括：第一电阻 R1 、第二电阻 R2 、第三电阻 R3 及第一 MOS 管 Q1 ；所述第一电阻 R1 的第一端接收栅极导通电压 VGH ，第二端电性连接第一节点 A ；所述第二电阻 R2 的第一端接地，第二端电性连接第一节点 A ；所述第三电阻 R3 的第一端电性连接第一节点 A ，第二端电性连接第一 MOS 管 Q1 的漏极；所述第一 MOS 管 Q1 的栅极接收控制电压 VSS ，源极接地；所述反馈模块 20 从第一节点 A 输出反馈电压 Vfb 。
进一步地，所述反馈模块 20 还包括第一二极管 D1 ，所述第一二极管 D1 的正极电性连接第一 MOS 管 Q1 的源极，负极电性连接第一 MOS 管 Q1 的漏极。
具体地，所述输出模块 10 包括：电感 L1 、第二二极管 D2 、第一电容 C1 、第二 MOS 管 Q2 、第四电阻 R4 ；所述电感 L1 的第一端接收输入电压 Vin ，第二端电性连接第二节点 B ；所述第二二极管 D2 的正极电性连接第二节点 B ，负极电性连接第三节点 C ；所述第一电容 C1 的第一端电性连接第三节点 C ，第二端接地；所述第二 MOS 管 Q2 的栅极电性连接控制模块 30 ，源极电性连接第四电阻 R4 的第一端，漏极电性连接第二节点 B ；所述第四电阻 R4 的第二端接地；所述输出模块 10 从第三节点 C 向反馈模块 20 输出栅极导通电压 VGH 。
进一步地，所述输出模块 10 还包括第二电容 C2 ，所述第二电容 C2 的第一端电性连接电感 L1 的第一端，第二端接地。
具体地，所述控制模块 30 包括比较器 F1 及脉冲宽度调制（ Pulse Width Modulation ， PWM ）控制器 301 ；所述比较器 F1 的同相输入端接收参考电压 Vref ，反向输入端从第一节点 A 接收反馈电压 Vfb ，输出端电性连接 PWM 控制器 301 的输入端；所述 PWM 控制器 301 的输出端电性连接第二 MOS 管 Q2 的栅极。
值得一提的是，所述比较器 F1 及 PWM 控制器 301 均集成于一控制芯片中。
具体地，所述第一 MOS 管 Q1 为 NMOS 管，所述第二电压值大于第一电压值。
需要说明的是，本发明的显示面板驱动电路的工作时，所述控制模块 30 接收参考电压 Vref 和反馈电压 Vfb ，并输出开关脉冲信号 VP ，控制所述第二 MOS 管 Q2 的开关，在所述第二 MOS 管 Q2 打开时，第二二极管 D1 截止，所述输入电压 Vin 为电感 L1 充电，使得电感 L1 中的电流持续增加，电感 L1 储能，在所述第二 MOS 管 Q2 关闭时，所述电感 L1 通过第二二极管 D1 为第一电容 C1 充电，使得第三节点 C 输出栅极导通电压 VGH ，所述开关脉冲信号 VP 控制所述第二 MOS 管 Q2 的反复开关，以持续输出所述栅极导通电压 VGH 。
进一步地，本发明的显示面板驱动电路的工作时，通过改变所述开关脉冲信号 VP 的占空比，改变所述第二 MOS 管 Q2 的开关频率，从而改变输出模块 10 输出的栅极导通电压 VGH 的大小，其中所述脉冲信号 VP 的占空比的越大，所述栅极导通电压 VGH 越大，所述控制模块 30 根据所述参考电压 Vref 和反馈电压 Vfb 的比较结果调整所述脉冲信号 VP 的占空比，当所述参考电压 Vref 大于所述反馈电压 Vfb 时，所述控制模块 30 提升所述脉冲信号 VP 的占空比，使得栅极导通电压 VGH 增大，直至所述参考电压 Vref 等于所述反馈电压 Vfb ，当所述参考电压 Vref 小于所述反馈电压 Vfb 时，所述控制模块 30 降低所述脉冲信号 VP 的占空比，使得栅极导通电压 VGH 减小，直至所述参考电压 Vref 等于所述反馈电压 Vfb 。
实际工作时，如图 3 所示，本发明的显示面板驱动电路包括两个工作阶段，分别为正常显示阶段及关机放电阶段，其中在正常显示阶段，所述控制电压 VSS 为第一电压值控制所述第一 MOS 管 Q1 截止，所述反馈电压 Vfb 由栅极导通电压 VGH 通过串联的第一电阻 R1 和第二电阻 R2 分压得到，所述栅极导通电压 VGH 等于： Vref × (1+R1/R2) ，反馈电压 Vfb 等于参考电压 Vref ；在第一时刻 t1 ，进入关机放电阶段，所述控制电压 VSS 切换至第二电压值，控制所述第一 MOS 管 Q1 导通，第三电阻 R3 被并联至第二电阻 R2 的两端，使得第一节点 A 输出的反馈电压 Vfb 下降，所述控制模块 10 侦测到所述反馈电压 Vfb 的下降，进而使得所述反馈电压 Vfb 和参考电压 Vref 比较结果变为反馈电压 Vfb 小于参考电压 Vref ，所述控制模块 30 提升所述脉冲信号 VP 的占空比，使得栅极导通电压 VGH 增大，随着栅极导通电压 VGH 的增大，反馈电压 Vfb 也开始增大，直至反馈电压 Vfb 和参考电压 Vref 再次相等，所述栅极导通电压 VGH 稳定输出，此时栅极导通电压 VGH 等于： Vref × [1+R1/(R2 × R3/R2+R3)] ，从而使得关机放电阶段的栅极导通电压 VGH 比正常工作阶段的栅极导通电压 VGH 更大，而像素的放电速度取决像素内的开关晶体管的导通程度，所述栅极导通电压 VGH 越大，所述像素内的开关晶体管的导通程度越大，像素的放电速度越快，从而本发明通过提高关机放电阶段的栅极导通电压 VGH ，能够提升像素的放电速度，更好的消除关机残影。
综上所述，本发明提供了一种显示面板驱动电路，包括：输出模块、与所述输出模块电性连接的反馈模块以及与所述输出模块及所述反馈模块均电性连接的控制模块；所述输出模块用于接收输入电压并利用所述输入电压产生并输出栅极导通电压；所述反馈模块用于接收所述栅极导通电压及控制电压，并根据所述栅极导通电压及控制电压产生反馈电压；所述控制模块用于接收参考电压及反馈电压，并比较所述参考电压及反馈电压，并根据比较结果控制所述输出模块输出的栅极导通电压的大小；在显示面板关机放电时，所述控制电压从第一电压值切换至第二电压值，以改变所述反馈电压以及所述参考电压与反馈电压的比较结果，使得所述控制模块控制所述输出模块输出的栅极导通电压升高，以实现像素的快速放电，避免关机残影。
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. 一种显示面板驱动电路，包括：输出模块、与所述输出模块电性连接的反馈模块以及与所述输出模块及所述反馈模块均电性连接的控制模块；
    所述输出模块用于接收输入电压并利用所述输入电压产生并输出栅极导通电压；
    所述反馈模块用于接收所述栅极导通电压及控制电压，并根据所述栅极导通电压及控制电压产生反馈电压；
    所述控制模块用于接收参考电压及反馈电压，并比较所述参考电压及反馈电压，并根据比较结果控制所述输出模块输出的栅极导通电压的大小；
    在显示面板的关机放电时，所述控制电压从第一电压值切换至第二电压值，以改变所述反馈电压以及所述参考电压与反馈电压的比较结果，使得所述控制模块控制所述输出模块输出的栅极导通电压升高。
  2. 如权利要求1所述的显示面板驱动电路，其中，所述反馈模块包括：第一电阻、第二电阻、第三电阻及第一MOS管；
    所述第一电阻的第一端接收栅极导通电压，第二端电性连接第一节点；
    所述第二电阻的第一端接地，第二端电性连接第一节点；
    所述第三电阻的第一端电性连接第一节点，第二端电性连接第一MOS管的漏极；
    所述第一MOS管的栅极接收控制电压，源极接地；
    所述反馈模块从第一节点输出反馈电压。
  3. 如权利要求2所述的显示面板驱动电路，其中，所述反馈模块还包括第一二极管，所述第一二极管的正极电性连接第一MOS管的源极，负极电性连接第一MOS管的漏极。
  4. 如权利要求2所述的显示面板驱动电路，其中，所述输出模块包括：电感、第二二极管、第一电容、第二MOS管及第四电阻；
    所述电感的第一端接收输入电压，第二端电性连接第二节点；
    所述第二二极管的正极电性连接第二节点，负极电性连接第三节点；
    所述第一电容的第一端电性连接第三节点，第二端接地；
    所述第二MOS管的栅极电性连接控制模块，源极电性连接第四电阻的第一端，漏极电性连接第二节点；
    所述第四电阻的第二端接地；
    所述输出模块从第三节点向反馈模块输出栅极导通电压。
  5. 如权利要求4所述的显示面板驱动电路，其中，所述输出模块还包括第二电容，所述第二电容的第一端电性连接电感的第一端，第二端接地。
  6. 如权利要求4所述的显示面板驱动电路，其中，所述控制模块包括比较器及PWM控制器；
    所述比较器的同相输入端接收参考电压，反向输入端从第一节点接收反馈电压，输出端电性连接PWM控制器的输入端；
    所述PWM控制器的输出端电性连接第二MOS管的栅极。
  7. 如权利要求1所述的显示面板驱动电路，其中，在显示面板关机放电时，所述控制模块控制所述输出模块输出的栅极导通电压升高，直至所述参考电压与反馈电压相等。
  8. 如权利要求2所述的显示面板驱动电路，其中，所述第一MOS管为NMOS管，所述第二电压值大于第一电压值。
  9. 如权利要求6所述的显示面板驱动电路，其中，所述PWM控制器的输出端向所述第二MOS管的栅极输出开关脉冲信号，以控制所述第二MOS管的开闭。
  10. 如权利要求6所述的显示面板驱动电路，其中，所述比较器及PWM控制器集成于一控制芯片中。
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