WO2016037382A1 - 驱动电路及液晶显示装置 - Google Patents

驱动电路及液晶显示装置 Download PDF

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Publication number
WO2016037382A1
WO2016037382A1 PCT/CN2014/086936 CN2014086936W WO2016037382A1 WO 2016037382 A1 WO2016037382 A1 WO 2016037382A1 CN 2014086936 W CN2014086936 W CN 2014086936W WO 2016037382 A1 WO2016037382 A1 WO 2016037382A1
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WIPO (PCT)
Prior art keywords
switch tube
signal
scan signal
angle
turned
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Application number
PCT/CN2014/086936
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English (en)
French (fr)
Inventor
陈宥烨
陈胤宏
吴东光
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US14/410,940 priority Critical patent/US9626927B2/en
Publication of WO2016037382A1 publication Critical patent/WO2016037382A1/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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • 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

Definitions

  • the present invention relates to the field of displays, and in particular to a driving circuit and a liquid crystal display device.
  • liquid crystal display devices for entertainment and socializing.
  • the liquid crystal display device if a still picture is held for a long time, the liquid crystal molecules cannot be normally deflected under the control of the signal voltage due to the long-term driving polarization of the liquid crystal; the performance is changed when the display screen is switched from one screen to another.
  • image afterimage Image Sticking
  • FIG. 1 is a schematic diagram of driving signals and data signals of a conventional liquid crystal display device.
  • Vcom is the common voltage
  • Vg is the scan signal
  • Vd is the data signal
  • Vs is the charging voltage of the pixel capacitor
  • ⁇ V1 is the charging loss.
  • the image sticking phenomenon is mainly caused by the fact that when the scanning signal Vg is turned off, the falling edge of the scanning signal Vg generates a certain charging loss ⁇ V1 by the charging voltage (data signal Vd) of the pixel capacitor through the corresponding coupling capacitor (the magnitude of the ⁇ V1) In proportion to the magnitude of ⁇ V2, the charging voltage Vs of the pixel capacitor is at a different charging polarity, and there is a certain asymmetry with respect to the common voltage Vcom. That is, regardless of whether the voltage polarity of the pixel capacitor is positive or negative, the falling edge of the scan signal Vg will produce the same polarity (negative) loss to the data signal Vd. If the above-described charging loss ⁇ V1 is sufficiently large, liquid crystal molecules may be not driven by the data signal Vd, causing image sticking.
  • An object of the present invention is to provide a driving circuit and a liquid crystal display device capable of eliminating image sticking phenomenon, thereby solving the technical problem that the conventional driving circuit and the liquid crystal display device are prone to image sticking.
  • the embodiment of the invention provides a driving circuit for driving a corresponding liquid crystal display device, which includes:
  • a corner elimination circuit for canceling the scanning signal to eliminate pixel charging voltage loss caused by the scanning signal being turned off;
  • a first switch tube for inputting a scan signal
  • a second switch tube for controlling conduction or disconnection of the first switch tube
  • a third switch tube for performing an anti-angle processing on the scan signal
  • the third switch tube performs a step-down process on the scan signal by using a canceling angle resistor to perform an anti-angle processing on the scan signal;
  • the input end of the first switch tube is connected to the scan signal, and the output end of the first switch tube outputs the scan signal; the control end of the first switch tube and the input of the second switch tube End connection, the output end of the second switch tube is grounded, the control end of the second switch tube is connected to the first de-angle control signal; the input end of the third switch tube and the output of the first switch tube End connection, the output end of the third switch tube is grounded through the canceling angle resistor, and the control end of the third switch tube is connected to the second de-angle control signal;
  • the first extinction angle control signal is opposite to the potential of the second declination control signal; the first de-angle control signal and the second de-angle control signal are square waves having a duty ratio equal to 0.5;
  • the angle elimination circuit includes: a plurality of fourth switch tubes and a declination selection chip;
  • the declination selection chip sends a conduction signal to the corresponding fourth switch tube according to the gray scale range of the display screen, to perform the degaussing processing on the scan signal;
  • An input end of the fourth switch tube is connected to an output end of the third switch tube, a control end of the fourth switch tube receives the turn-on signal, and an output end of the fourth switch tube passes through a corresponding Describe the grounding resistance of the grounding;
  • the resistance values of the de-angle resistors corresponding to each of the fourth switch tubes are different.
  • the grayscale range of the display screen is determined according to an average grayscale value of all pixels of the display screen.
  • the gray scale range of the display screen is determined according to the gray scale distribution of all the pixels of the display screen.
  • the driving circuit of the present invention when the driving circuit performs pixel charging processing, the second switching tube is turned on; the first switching tube is turned on, and the first switching tube outputs a scanning signal; The third switch is disconnected, and the scan signal is input to a corresponding scan line;
  • the second switch tube When the driving circuit performs the elimination processing of the scan signal, the second switch tube is turned off, the first switch tube is also turned off, and the third switch tube is turned on.
  • the scan signal is subjected to a step-down process by the third switch tube and the corresponding vanishing resistor.
  • the embodiment of the invention further provides a driving circuit for driving a corresponding liquid crystal display device, which includes:
  • a corner elimination circuit for canceling the scanning signal to eliminate pixel charging voltage loss caused by the scanning signal being turned off;
  • a first switch tube for inputting a scan signal
  • a second switch tube for controlling conduction or disconnection of the first switch tube
  • a third switch tube for performing an anti-angle processing on the scan signal
  • the third switch tube performs a step-down process on the scan signal by using a canceling angle resistor to perform an anti-angle processing on the scan signal.
  • the input end of the first switch tube is connected to the scan signal, and the output end of the first switch tube outputs the scan signal;
  • the control end of the first switch tube Connected to the input end of the second switch tube, the output end of the second switch tube is grounded, the control end of the second switch tube is connected to the first de-angle control signal;
  • the input end of the third switch tube Connected to the output end of the first switch tube, the output end of the third switch tube is grounded through the canceling angle resistor, and the control end of the third switch tube is connected to the second de-angle control signal.
  • the first extinction angle control signal and the second declination control signal have opposite potential polarities; the first de-angle control signal and the second de-angle control signal A square wave with a duty cycle equal to 0.5.
  • the angle eliminating circuit further includes: a plurality of fourth switching tubes and a declination selection chip;
  • the declination selection chip sends a conduction signal to the corresponding fourth switch tube according to the gray scale range of the display screen, to perform the degaussing processing on the scan signal;
  • An input end of the fourth switch tube is connected to an output end of the third switch tube, a control end of the fourth switch tube receives the turn-on signal, and an output end of the fourth switch tube passes through a corresponding Describe the grounding resistance of the grounding;
  • the resistance values of the de-angle resistors corresponding to each of the fourth switch tubes are different.
  • the grayscale range of the display screen is determined according to an average grayscale value of all pixels of the display screen.
  • the gray scale range of the display screen is determined according to the gray scale distribution of all the pixels of the display screen.
  • the driving circuit of the present invention when the driving circuit performs pixel charging processing, the second switching tube is turned on; the first switching tube is turned on, and the first switching tube outputs a scanning signal; The third switch is disconnected, and the scan signal is input to a corresponding scan line;
  • the second switch tube When the driving circuit performs the elimination processing of the scan signal, the second switch tube is turned off, the first switch tube is also turned off, and the third switch tube is turned on.
  • the scan signal is subjected to a step-down process by the third switch tube and the corresponding vanishing resistor.
  • the present invention also provides a liquid crystal display device comprising: a liquid crystal display panel, a backlight, and a driving circuit;
  • the driving circuit includes:
  • a scan signal driving chip for providing a scan signal
  • a data signal driving chip for providing a data signal
  • a corner elimination circuit for canceling the scanning signal to eliminate pixel charging voltage loss caused by the scanning signal being turned off;
  • a first switch tube for inputting a scan signal
  • a second switch tube for controlling conduction or disconnection of the first switch tube
  • a third switch tube for performing an anti-angle processing on the scan signal
  • the third switch tube performs a step-down process on the scan signal by using a canceling angle resistor to perform an anti-angle processing on the scan signal.
  • the input end of the first switch tube is connected to the scan signal, the output end of the first switch tube outputs the scan signal; and the control of the first switch tube The end is connected to the input end of the second switch tube, the output end of the second switch tube is grounded, the control end of the second switch tube is connected to the first de-angle control signal; the input of the third switch tube The end is connected to the output end of the first switch tube, the output end of the third switch tube is grounded through the canceling angle resistor, and the control end of the third switch tube is connected to the second de-angle control signal.
  • the first extinction angle control signal and the second extinction angle control signal have opposite potential polarities; the first de-angle control signal and the second de-angle control The signal is a square wave with a duty cycle equal to 0.5.
  • the angle eliminating circuit further includes: a plurality of fourth switching tubes and an asymmetry selecting chip;
  • the declination selection chip sends a conduction signal to the corresponding fourth switch tube according to the gray scale range of the display screen, to perform the degaussing processing on the scan signal;
  • An input end of the fourth switch tube is connected to an output end of the third switch tube, a control end of the fourth switch tube receives the turn-on signal, and an output end of the fourth switch tube passes through a corresponding Describe the grounding resistance of the grounding;
  • the resistance values of the de-angle resistors corresponding to each of the fourth switch tubes are different.
  • the gray scale range of the display screen is determined based on an average grayscale value of all pixels of the display screen.
  • the gray scale range of the display screen is determined according to the gray scale distribution of all the pixels of the display screen.
  • the second switching tube when the driving circuit performs pixel charging processing, the second switching tube is turned on; the first switching tube is turned on, and the first switching tube outputs a scanning signal; The third switch tube is disconnected, and the scan signal is input into a corresponding scan line;
  • the second switch tube When the driving circuit performs the elimination processing of the scan signal, the second switch tube is turned off, the first switch tube is also turned off, and the third switch tube is turned on.
  • the scan signal is subjected to a step-down process by the third switch tube and the corresponding vanishing resistor.
  • the driving circuit and the liquid crystal display device of the present invention perform the step-down processing on the scanning signal by setting the third switching tube through the erasing resistor, thereby eliminating the angle of the scanning signal. It is better to eliminate the image sticking phenomenon of the display screen; and solve the technical problem that the existing driving circuit and the liquid crystal display device are prone to image sticking.
  • FIG. 1 is a schematic diagram showing driving of a scanning signal and a data signal of a conventional liquid crystal display device
  • FIG. 2 is a block diagram showing the structure of a driving circuit of a preferred embodiment of the liquid crystal display device of the present invention
  • FIG. 3 is a schematic diagram showing the circuit structure of a canceling circuit of a driving circuit of a preferred embodiment of the liquid crystal display device of the present invention
  • FIG. 4 is a second schematic diagram showing the circuit structure of a canceling circuit of a driving circuit of a preferred embodiment of the liquid crystal display device of the present invention
  • Fig. 5 is a schematic view showing driving of a scanning signal and a data signal in a preferred embodiment of the liquid crystal display device of the present invention.
  • FIG. 2 is a structural block diagram of a driving circuit of a preferred embodiment of a liquid crystal display device of the present invention
  • FIG. 3 is a circuit diagram of a corner eliminating circuit of a driving circuit of a preferred embodiment of the liquid crystal display device of the present invention.
  • FIG. 4 is a second schematic diagram of the circuit structure of the canceling circuit of the driving circuit of the preferred embodiment of the liquid crystal display device of the present invention.
  • the liquid crystal display device of the preferred embodiment includes a liquid crystal display panel (not shown), a backlight (not shown), and a drive circuit 20.
  • the liquid crystal display panel is used for displaying a data signal; the backlight is used to provide a display light source to the liquid crystal display panel; and the driving circuit 20 is for providing signal driving to the liquid crystal display panel.
  • the drive circuit 20 includes a scan signal drive chip 21, a data signal drive chip 22, and a vanishing circuit 23.
  • the scan signal driving chip 21 is for providing a scan signal;
  • the data signal driving chip 22 is for providing a data signal;
  • the eliminating circuit 23 is for performing a de-angle processing on the scan signal to eliminate pixel charging voltage loss caused when the scan signal is turned off.
  • the angle eliminating circuit 23 includes a first switching tube 231, a second switching tube 232, and a third switching tube 233.
  • the first switch tube 231 is used to input a scan signal; the second switch tube 232 is used to control the on or off of the first switch tube 231; and the third switch tube 233 is used to perform a corner elimination process on the scan signal.
  • the third switch tube 233 performs a step-down process on the scan signal by the canceling angle resistor 236 to perform a de-angle processing on the scan signal.
  • the input end of the first switch tube 231 is connected to the scan signal Vg, and the output end of the first switch tube 231 outputs the scan signal Vg to the scan line GL; the control end of the first switch tube 231 and the second switch tube
  • the input end of the second switch tube 232 is connected to the ground, the control end of the second switch tube 232 is connected to the first cancel angle control signal 24; the input end of the third switch tube 233 and the output of the first switch tube 321
  • the output end of the third switch tube 233 is grounded through the A terminal and the corresponding vanishing resistor 236, and the control end of the third switch tube 233 is connected to the second de-angle control signal 25.
  • the first declination control signal 24 and the second declination control signal 25 have opposite potential polarities, and the first de-angle control signal 24 and the second de-angle control signal 25 are square waves having a duty ratio equal to 0.5.
  • the eliminator circuit 23 further includes a plurality of fourth switch tubes 234 and a declination selection chip 235.
  • the declination selection chip 235 sends a guide to the corresponding fourth switch tube 234 according to the gray scale range of the display screen.
  • the signal is passed through to eliminate the scan signal; the input end of the fourth switch 234 is connected to the output end of the third switch 233, the control end of the fourth switch 234 receives the turn-on signal, and the fourth switch 234 is The output ends are grounded through respective erasing resistors 236, wherein the resistance values of the wiper resistors 236 corresponding to each of the fourth switch tubes 234 are different.
  • the declination selection chip 235 includes timing control chips 2351 and 38 decoding chips 2352.
  • the declination circuit 20 includes eight fourth switching transistors 234 and corresponding degaussing resistors 236.
  • the declination selection chip 235 transmits a control signal to the 38 decoder chip 2352 through three general output ports (GPOs) of the timing control chip 2351, so that the 38 decoding chip 2352 can generate eight different on signals to control different numbers.
  • GPOs general output ports
  • the four switch tubes 234 are turned on; and the different erasing resistors 236 are used to step down the scan signals.
  • the details can be as shown in Table 1.
  • the erasing selection chip 235 determines the grayscale range of the display screen according to the average grayscale value of all the pixels of the display screen. For example, the display screen is divided into eight gray scale ranges: 0 gray scale to 31 gray scale, 32 gray scale to 63 gray scale, 64 gray scale to 95 gray scale, 96 gray scale to 127 gray scale, 128 gray scale to 159 gray Order, 160 gray scale to 191 gray scale, 192 gray scale to 223 gray scale, 224 gray scale to 255 gray scale.
  • the different gray scale ranges of the display screen can control different fourth switch tubes 234 to be turned on. If the average gray scale value of all the pixels of the display screen is 80 gray scales, it is determined that the display screen is located at 64 gray scale to 95 gray scale. The gray scale range, at this time, the fourth switch tube Q13 can be turned on, and the other fourth switch tube 234 can be turned off.
  • the erasing selection chip 235 can also determine the gray scale range of the display screen according to the gray scale distribution of all pixels of the display screen.
  • the display screen is divided into eight gray scale ranges: 0 gray scale to 31 gray scale, 32 gray scale to 63 gray scale, 64 gray scale to 95 gray scale, 96 gray scale to 127 gray scale, 128 gray scale to 159 gray Order, 160 gray scale to 191 gray scale, 192 gray scale to 223 gray scale, 224 gray scale to 255 gray scale.
  • the pixels of the gray scale of the display screen to the gray level of 120 are 80% of all the pixels, and then the display screen is determined to be in the gray scale range of 96 gray scale to 127 gray scale, and the fourth switch tube Q14 can be turned on and disconnected.
  • Fig. 5 is a schematic view showing driving of a scanning signal and a data signal in a preferred embodiment of the liquid crystal display device of the present invention.
  • the declination selection chip 235 first displays the average gray level value of all the pixels of the picture or the gray scale distribution of all the pixels according to the frame. Determine the grayscale range of the display.
  • the erasing selection chip 235 sends an on signal to the corresponding fourth switch 234 according to the gray scale range of the display screen, so that the corresponding fourth switch 234 is turned on.
  • the driving circuit 20 of the liquid crystal display device charges the pixel
  • the data signal of the driving circuit 20 drives the chip 21 to supply a data signal to the data line
  • the scanning signal of the driving circuit 20 drives the chip 22 to supply a scanning signal to the scanning line.
  • the second switch tube 232 of the angle eliminating circuit 23 is turned on under the control of the first angle-of-angle control signal 24, at which time the potential of the control terminal of the first switch tube 231 is pulled down to the low level, so the first switch tube 231 Turn on.
  • the second declination control signal 25 is opposite in polarity to the potential of the first de-angle control signal 24, so the third switching tube 233 is turned off under the control of the second de-angle control signal 25.
  • the scan signal Vg is input to the corresponding scan line GL through the input end of the first switch transistor 231 and the output end of the first switch transistor 231.
  • the corresponding data signal is also input to the corresponding data line, so the charging voltage Vs of the pixel capacitor gradually rises to the voltage of the data signal Vd.
  • the driving circuit 20 performs the de-angle processing on the scanning signal Vg, that is, the voltage of the scanning signal Vg is lowered while maintaining the high level of the scanning signal Vg.
  • the second switch tube 232 of the angle-eliminating circuit 23 is turned off under the control of the first angle-of-angle control signal 24, at which time the potential of the control terminal of the first switch tube 231 is turned to a high level under the influence of the scan signal Vg. Therefore, the first switching transistor 231 is turned off.
  • the second erasing control signal 25 is opposite in polarity to the potential of the first declination control signal 24, so the third switching tube 233 is turned on under the control of the second de-angle control signal 25.
  • the voltage of the scan signal Vg on the scan line GL is stepped down by the third switch 233, the turned-on fourth switch 234, and the corresponding eraser resistor 236, so that the voltage of the scan signal Vg is gradually lowered.
  • the scanning signal driving chip 21 of the driving circuit 20 stops supplying the scanning signal to the scanning line, the voltage of the scanning signal Vg on the scanning line is rapidly lowered, and the scanning signal Vg generates a falling edge of ⁇ V2.
  • the falling edge passes through the corresponding coupling capacitor, so that the charging voltage Vs of the pixel capacitor generates a charging loss of ⁇ V1 (at this time, since the scanning signal on the scanning line is lowered to a low level, the data signal on the data line cannot perform the pixel capacitance. Charging).
  • the ⁇ V2 is reduced, the charging loss ⁇ V1 of the charging voltage of the pixel capacitor is also reduced, thereby attenuating or even eliminating the phenomenon of image sticking of the liquid crystal display device.
  • different erasing resistors 236 can be used to perform the degaussing processing on the scanning signal Vg, so that the driving time of the sufficient scanning signal Vg and the charging voltage of the pixel capacitor can be ensured.
  • the charging voltage Vs of the pixel capacitor is affected by the minimum charging loss ⁇ V1.
  • the value of the specific erasing resistor 236 can be set according to user needs and actual conditions.
  • the driving circuit and the liquid crystal display device of the present invention can perform the step-down processing on the scanning signal by setting the third switching tube through the erasing resistor, thereby performing the de-angle processing on the scanning signal, thereby better eliminating the image sticking phenomenon of the display screen;
  • the conventional driving circuit and the liquid crystal display device are susceptible to image sticking.

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Abstract

一种驱动电路（20）和一种液晶显示装置，该驱动电路（20）包括消角电路（23）；该消角电路（23）包括第一开关管（231）、第二开关管（232）以及第三开关管（233）；其中第三开关管（233）通过消角电阻（236）对扫描信号进行降压处理，以对扫描信号进行消角处理。该驱动电路（20）通过设置第三开关管（233）可较好的消除显示画面的影像残影现象。

Description

驱动电路及液晶显示装置 技术领域
本发明涉及显示器领域，特别是涉及一种驱动电路及液晶显示装置。
 背景技术
随着科技和社会的发展，越来越多的人使用液晶显示装置进行娱乐以及社交。液晶显示装置使用时，如长时间保持一静止的画面，由于液晶受到长时间的驱动极化，造成液晶分子不能在信号电压控制下正常偏转；表现为当显示画面由一个画面切换至另一个画面时，用户仍然可以隐约看到上一个画面的图像，这里称之为影像残影（Image Sticking）。
如图1所示，图1为现有的液晶显示装置的扫描信号以及数据信号的驱动示意图。其中Vcom为公共电压，Vg为扫描信号，Vd为数据信号，Vs为像素电容的充电电压，ΔV1为充电损耗。
影像残影现象的产生原因主要是：由于扫描信号Vg关闭时，扫描信号Vg的下降沿通过相应的耦合电容对像素电容的充电电压（数据信号Vd）产生一定的充电损耗ΔV1（该ΔV1的大小与ΔV2的大小成正比），造成像素电容的充电电压Vs在不同的充电极性上，相对公共电压Vcom存在一定的不对称性。即无论像素电容的电压极性为正还是负，扫描信号Vg的下降沿均会对该数据信号Vd产生相同极性（负）的损耗。如果上述的充电损耗ΔV1足够大，则可能液晶分子不受数据信号Vd的驱动，造成影像残影。
故，有必要提供一种驱动电路及液晶显示装置，以解决现有技术所存在的问题。
 技术问题
本发明的目的在于提供一种可以消除影像残影现象的驱动电路及液晶显示装置，以解决现有的驱动电路及液晶显示装置易产生影像残影的技术问题。
 技术解决方案
本发明实施例提供一种驱动电路，用于驱动相应的液晶显示装置，其包括：
消角电路，用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗；包括：
第一开关管，用于输入扫描信号；
Figure TP140566PCT-appb-I000001
第二开关管，用于控制所述第一开关管的导通或断开；以及
第三开关管，用于对所述扫描信号进行消角处理；
Figure TP140566PCT-appb-I000001
其中所述第三开关管通过消角电阻对所述扫描信号进行降压处理，以对所述扫描信号进行消角处理；
其中所述第一开关管的输入端与所述扫描信号连接，所述第一开关管的输出端输出所述扫描信号；所述第一开关管的控制端与所述第二开关管的输入端连接，所述第二开关管的输出端接地，所述第二开关管的控制端与第一消角控制信号连接；所述第三开关管的输入端与所述第一开关管的输出端连接，所述第三开关管的输出端通过所述消角电阻接地，所述第三开关管的控制端与第二消角控制信号连接；
所述第一消角控制信号与所述第二消角控制信号的电位极性相反；所述第一消角控制信号与所述第二消角控制信号为占空比等于0.5的方形波；
所述消角电路包括：多个第四开关管以及消角选择芯片；
所述消角选择芯片根据显示画面的灰阶范围，向相应的第四开关管发送导通信号，以对所述扫描信号进行消角处理；
所述第四开关管的输入端与所述第三开关管的输出端连接，所述第四开关管的控制端接收所述导通信号，所述第四开关管的输出端通过相应的所述消角电阻接地；
Figure TP140566PCT-appb-I000001
其中每个所述第四开关管对应的所述消角电阻的阻值均不同。
Figure TP140566PCT-appb-I000001
在本发明所述的驱动电路中，根据所述显示画面的所有像素的平均灰阶值，确定所述显示画面的灰阶范围。
在本发明所述的驱动电路中，根据所述显示画面的所有像素的灰阶分布情况，确定所述显示画面的灰阶范围。
在本发明所述的驱动电路中，当所述驱动电路进行像素充电处理时，所述第二开关管导通；所述第一开关管导通，所述第一开关管输出扫描信号；所述第三开关管断开，所述扫描信号输入到相应的扫描线中；
Figure TP140566PCT-appb-I000001
当所述驱动电路进行所述扫描信号的消角处理时，所述第二开关管断开，所述第一开关管也断开，所述第三开关管导通， 所述扫描信号通过所述第三开关管以及相应的所述消角电阻进行降压处理。
本发明实施例还提供一种驱动电路，用于驱动相应的液晶显示装置，其包括：
消角电路，用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗；包括：
第一开关管，用于输入扫描信号；
第二开关管，用于控制所述第一开关管的导通或断开；以及
第三开关管，用于对所述扫描信号进行消角处理；
Figure TP140566PCT-appb-I000001
其中所述第三开关管通过消角电阻对所述扫描信号进行降压处理，以对所述扫描信号进行消角处理。
在本发明所述的驱动电路中，所述第一开关管的输入端与所述扫描信号连接，所述第一开关管的输出端输出所述扫描信号；所述第一开关管的控制端与所述第二开关管的输入端连接，所述第二开关管的输出端接地，所述第二开关管的控制端与第一消角控制信号连接；所述第三开关管的输入端与所述第一开关管的输出端连接，所述第三开关管的输出端通过所述消角电阻接地，所述第三开关管的控制端与第二消角控制信号连接。
在本发明所述的驱动电路中，所述第一消角控制信号与所述第二消角控制信号的电位极性相反；所述第一消角控制信号与所述第二消角控制信号为占空比等于0.5的方形波。
在本发明所述的驱动电路中，所述消角电路还包括：多个第四开关管以及消角选择芯片；
所述消角选择芯片根据显示画面的灰阶范围，向相应的第四开关管发送导通信号，以对所述扫描信号进行消角处理；
所述第四开关管的输入端与所述第三开关管的输出端连接，所述第四开关管的控制端接收所述导通信号，所述第四开关管的输出端通过相应的所述消角电阻接地；
Figure TP140566PCT-appb-I000001
其中每个所述第四开关管对应的所述消角电阻的阻值均不同。
在本发明所述的驱动电路中，根据所述显示画面的所有像素的平均灰阶值，确定所述显示画面的灰阶范围。
在本发明所述的驱动电路中，根据所述显示画面的所有像素的灰阶分布情况，确定所述显示画面的灰阶范围。
在本发明所述的驱动电路中，当所述驱动电路进行像素充电处理时，所述第二开关管导通；所述第一开关管导通，所述第一开关管输出扫描信号；所述第三开关管断开，所述扫描信号输入到相应的扫描线中；
Figure TP140566PCT-appb-I000001
当所述驱动电路进行所述扫描信号的消角处理时，所述第二开关管断开，所述第一开关管也断开，所述第三开关管导通， 所述扫描信号通过所述第三开关管以及相应的所述消角电阻进行降压处理。
本发明还提供一种液晶显示装置，其包括：液晶显示面板、背光源以及驱动电路；
所述驱动电路包括：
Figure TP140566PCT-appb-I000001
扫描信号驱动芯片，用于提供扫描信号；
数据信号驱动芯片，用于提供数据信号；以及
消角电路，用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗；包括：
第一开关管，用于输入扫描信号；
Figure TP140566PCT-appb-I000001
第二开关管，用于控制所述第一开关管的导通或断开；以及
第三开关管，用于对所述扫描信号进行消角处理；
其中所述第三开关管通过消角电阻对所述扫描信号进行降压处理，以对所述扫描信号进行消角处理。
在本发明所述的液晶显示装置中，所述第一开关管的输入端与所述扫描信号连接，所述第一开关管的输出端输出所述扫描信号；所述第一开关管的控制端与所述第二开关管的输入端连接，所述第二开关管的输出端接地，所述第二开关管的控制端与第一消角控制信号连接；所述第三开关管的输入端与所述第一开关管的输出端连接，所述第三开关管的输出端通过所述消角电阻接地，所述第三开关管的控制端与第二消角控制信号连接。
在本发明所述的液晶显示装置中，所述第一消角控制信号与所述第二消角控制信号的电位极性相反；所述第一消角控制信号与所述第二消角控制信号为占空比等于0.5的方形波。
在本发明所述的液晶显示装置中，所述消角电路还包括：多个第四开关管以及消角选择芯片；
所述消角选择芯片根据显示画面的灰阶范围，向相应的第四开关管发送导通信号，以对所述扫描信号进行消角处理；
所述第四开关管的输入端与所述第三开关管的输出端连接，所述第四开关管的控制端接收所述导通信号，所述第四开关管的输出端通过相应的所述消角电阻接地；
Figure TP140566PCT-appb-I000001
其中每个所述第四开关管对应的所述消角电阻的阻值均不同。
在本发明所述的液晶显示装置中，根据所述显示画面的所有像素的平均灰阶值，确定所述显示画面的灰阶范围。
在本发明所述的液晶显示装置中，根据所述显示画面的所有像素的灰阶分布情况，确定所述显示画面的灰阶范围。
在本发明所述的液晶显示装置中，当所述驱动电路进行像素充电处理时，所述第二开关管导通；所述第一开关管导通，所述第一开关管输出扫描信号；所述第三开关管断开，所述扫描信号输入到相应的扫描线中；
Figure TP140566PCT-appb-I000001
当所述驱动电路进行所述扫描信号的消角处理时，所述第二开关管断开，所述第一开关管也断开，所述第三开关管导通， 所述扫描信号通过所述第三开关管以及相应的所述消角电阻进行降压处理。
 有益效果
相较于现有的驱动电路及液晶显示装置，本发明的驱动电路及液晶显示装置通过设置第三开关管通过消角电阻对扫描信号进行降压处理，从而对扫描信号进行消角处理，可较好的消除显示画面的影像残影现象；解决了现有的驱动电路及液晶显示装置易产生影像残影的技术问题。
 附图说明
图1为现有的液晶显示装置的扫描信号以及数据信号的驱动示意图；
图2为本发明的液晶显示装置的优选实施例的驱动电路的结构框图；
图3为本发明的液晶显示装置的优选实施例的驱动电路的消角电路的电路结构示意图之一；
图4为本发明的液晶显示装置的优选实施例的驱动电路的消角电路的电路结构示意图之二；
图5为本发明的液晶显示装置的优选实施例的扫描信号以及数据信号的驱动示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的单元是以相同标号表示。
Figure TP140566PCT-appb-I000001
请参照图2至图4，图2为本发明的液晶显示装置的优选实施例的驱动电路的结构框图，图3为本发明的液晶显示装置的优选实施例的驱动电路的消角电路的电路结构示意图之一，图4为本发明的液晶显示装置的优选实施例的驱动电路的消角电路的电路结构示意图之二。本优选实施例的液晶显示装置包括液晶显示面板（图中未示出）、背光源（图中未示出）以及驱动电路20。液晶显示面板用于显示数据信号；背光源用于提供给液晶显示面板提供显示光源；驱动电路20用于向液晶显示面板提供信号驱动。
Figure TP140566PCT-appb-I000001
该驱动电路20包括扫描信号驱动芯片21、数据信号驱动芯片22以及消角电路23。扫描信号驱动芯片21用于提供扫描信号；数据信号驱动芯片22用于提供数据信号；消角电路23用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗。
该消角电路23包括第一开关管231、第二开关管232以及第三开关管233。第一开关管231用于输入扫描信号；第二开关管232用于控制第一开关管231的导通或断开；第三开关管233用于对扫描信号进行消角处理。第三开关管233通过消角电阻236对扫描信号进行降压处理，以对扫描信号进行消角处理。
Figure TP140566PCT-appb-I000001
如图3所示，第一开关管231的输入端与扫描信号Vg连接，第一开关管231的输出端输出扫描信号Vg至扫描线GL；第一开关管231的控制端与第二开关管232的输入端连接，第二开关管232的输出端接地，第二开关管232的控制端与第一消角控制信号24连接；第三开关管233的输入端与第一开关管321的输出端连接，第三开关管233的输出端通过A端以及相应的消角电阻236接地，第三开关管233的控制端与第二消角控制信号25连接。
Figure TP140566PCT-appb-I000001
优选的，第一消角控制信号24与第二消角控制信号25的电位极性相反，第一消角控制信号24与第二消角控制信号25为占空比等于0.5的方形波。
Figure TP140566PCT-appb-I000001
如图4所示，消角电路23还包括多个第四开关管234以及消角选择芯片235，该消角选择芯片235根据显示画面的灰阶范围，向相应的第四开关管234发送导通信号，以对扫描信号进行消角处理；第四开关管234的输入端与第三开关管233的输出端连接，第四开关管234的控制端接收导通信号，第四开关管234的输出端通过相应的消角电阻236接地，其中每个第四开关管234对应的消角电阻236的阻值均不同。
在本优选实施例中，消角选择芯片235包括时序控制芯片2351以及38译码芯片2352，消角电路20包括八个第四开关管234以及相应的消角电阻236。消角选择芯片235通过时序控制芯片2351的三个通用输出端口（GPO）向38译码芯片2352发送控制信号，从而38译码芯片2352可产生八种不同的导通信号，以控制不同的第四开关管234导通；进而采用不同的消角电阻236对扫描信号进行降压处理。具体可如表1所示。
Figure TP140566PCT-appb-I000002
其中消角选择芯片235根据显示画面的所有像素的平均灰阶值，确定显示画面的灰阶范围。如将显示画面分为八个灰阶范围：0灰阶至31灰阶、32灰阶至63灰阶、64灰阶至95灰阶、96灰阶至127灰阶、128灰阶至159灰阶、160灰阶至191灰阶、192灰阶至223灰阶、224灰阶至255灰阶。显示画面的不同灰阶范围，可控制不同的第四开关管234导通，如显示画面的所有像素的平均灰阶值为80灰阶，则确定该显示画面位于64灰阶至95灰阶的灰阶范围，这时可以导通第四开关管Q13，断开其他第四开关管234。
同时消角选择芯片235也可根据显示画面的所有像素的灰阶分布情况，确定显示画面的灰阶范围。如将显示画面分为八个灰阶范围：0灰阶至31灰阶、32灰阶至63灰阶、64灰阶至95灰阶、96灰阶至127灰阶、128灰阶至159灰阶、160灰阶至191灰阶、192灰阶至223灰阶、224灰阶至255灰阶。显示画面的110灰阶至120灰阶的像素占所有像素的80%，则确定该显示画面位于96灰阶至127灰阶的灰阶范围，这时可以导通第四开关管Q14，断开其他第四开关管234。
下面结合图2至图5详细说明本发明的液晶显示装置的优选实施例的具体工作原理。图5为本发明的液晶显示装置的优选实施例的扫描信号以及数据信号的驱动示意图。
本优选实施例的液晶显示装置使用时，当液晶显示装置显示某一帧画面时，首先消角选择芯片235根据该帧显示画面的所有像素的平均灰阶值或所有像素的灰阶分布情况，确定显示画面的灰阶范围。消角选择芯片235根据显示画面的灰阶范围，向相应的第四开关管234发送导通信号，使相应的第四开关管234导通。
然后液晶显示装置的驱动电路20对像素进行充电处理，驱动电路20的数据信号驱动芯片21给数据线提供数据信号，驱动电路20的扫描信号驱动芯片22给扫描线提供扫描信号。这时消角电路23的第二开关管232在第一消角控制信号24的控制下导通，这时第一开关管231的控制端的电位被下拉至低电平，因此第一开关管231导通。第二消角控制信号25与第一消角控制信号24的电位极性相反，因此第三开关管233在第二消角控制信号25的控制下断开。扫描信号Vg通过第一开关管231的输入端、第一开关管231的输出端输入到相应的扫描线GL中。这样相应的数据信号也输入相应的数据线中，因此像素电容的充电电压Vs逐渐上升至数据信号Vd的电压。
在充电电压Vs上升过程中，驱动电路20对扫描信号Vg进行消角处理，即在维持扫描信号Vg高电平的基础上，降低扫描信号Vg的电压。这时消角电路23的第二开关管232在第一消角控制信号24的控制下断开，这时第一开关管231的控制端的电位在扫描信号Vg的影响下转为高电平，因此第一开关管231断开。第二消角控制信号25与第一消角控制信号24的电位极性相反，因此第三开关管233在第二消角控制信号25的控制下导通。扫描线GL上的扫描信号Vg的电压通过第三开关管233、导通的第四开关管234以及相应的消角电阻236进行降压处理，使得扫描信号Vg的电压逐步降低。
当驱动电路20对像素充电处理完毕，驱动电路20的扫描信号驱动芯片21停止给扫描线提供扫描信号，扫描线上的扫描信号Vg的电压快速降低，扫描信号Vg产生了一个ΔV2的下降沿，该下降沿通过相应的耦合电容，使得像素电容的充电电压Vs产生了一个ΔV1的充电损耗（这时由于扫描线上的扫描信号降低为低电平，数据线上的数据信号无法对像素电容进行充电）。但是由于ΔV2的减小，像素电容的充电电压的充电损耗ΔV1也减小，因此减弱甚至消除了液晶显示装置的影像残影的现象。
同时对于显示画面的不同灰阶范围，可采用不同的消角电阻236对扫描信号Vg进行消角处理，这样可在保证充足的扫描信号Vg的驱动时间以及像素电容的充电电压的基础上，使得像素电容的充电电压Vs受到最小的充电损耗ΔV1的影响。具体的消角电阻236的数值可根据用户需要和实际情况进行设置。
本发明的驱动电路及液晶显示装置通过设置第三开关管通过消角电阻对扫描信号进行降压处理，从而对扫描信号进行消角处理，可较好的消除显示画面的影像残影现象；解决了现有的驱动电路及液晶显示装置易产生影像残影的技术问题。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (18)

  1. 一种驱动电路，用于驱动相应的液晶显示装置，其包括：
    消角电路，用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗；包括：
    第一开关管，用于输入扫描信号；
    Figure TP140566PCT-appb-I000001
    第二开关管，用于控制所述第一开关管的导通或断开；以及
    第三开关管，用于对所述扫描信号进行消角处理；
    其中所述第三开关管通过消角电阻对所述扫描信号进行降压处理，以对所述扫描信号进行消角处理；
    其中所述第一开关管的输入端与所述扫描信号连接，所述第一开关管的输出端输出所述扫描信号；所述第一开关管的控制端与所述第二开关管的输入端连接，所述第二开关管的输出端接地，所述第二开关管的控制端与第一消角控制信号连接；所述第三开关管的输入端与所述第一开关管的输出端连接，所述第三开关管的输出端通过所述消角电阻接地，所述第三开关管的控制端与第二消角控制信号连接；
    Figure TP140566PCT-appb-I000001
    所述第一消角控制信号与所述第二消角控制信号的电位极性相反；所述第一消角控制信号与所述第二消角控制信号为占空比等于0.5的方形波；
    所述消角电路还包括：多个第四开关管以及消角选择芯片；
    所述消角选择芯片根据显示画面的灰阶范围，向相应的第四开关管发送导通信号，以对所述扫描信号进行消角处理；
    所述第四开关管的输入端与所述第三开关管的输出端连接，所述第四开关管的控制端接收所述导通信号，所述第四开关管的输出端通过相应的所述消角电阻接地；
    Figure TP140566PCT-appb-I000001
    其中每个所述第四开关管对应的所述消角电阻的阻值均不同。
  2. 根据权利要求1所述的驱动电路，其中根据所述显示画面的所有像素的平均灰阶值，确定所述显示画面的灰阶范围。
    Figure TP140566PCT-appb-I000001
  3. 根据权利要求1所述的驱动电路，其中根据所述显示画面的所有像素的灰阶分布情况，确定所述显示画面的灰阶范围。
  4. 根据权利要求1所述的驱动电路，其中，
    Figure TP140566PCT-appb-I000001
    当所述驱动电路进行像素充电处理时，所述第二开关管导通；所述第一开关管导通，所述第一开关管输出扫描信号；所述第三开关管断开，所述扫描信号输入到相应的扫描线中；
    Figure TP140566PCT-appb-I000001
    当所述驱动电路进行所述扫描信号的消角处理时，所述第二开关管断开，所述第一开关管也断开，所述第三开关管导通， 所述扫描信号通过所述第三开关管以及相应的所述消角电阻进行降压处理。
  5. 一种驱动电路，用于驱动相应的液晶显示装置，其包括：
    Figure TP140566PCT-appb-I000001
    消角电路，用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗；包括：
    第一开关管，用于输入扫描信号；
    第二开关管，用于控制所述第一开关管的导通或断开；以及
    第三开关管，用于对所述扫描信号进行消角处理；
    其中所述第三开关管通过消角电阻对所述扫描信号进行降压处理，以对所述扫描信号进行消角处理。
    Figure TP140566PCT-appb-I000001
  6. 根据权利要求5所述的驱动电路，其中所述第一开关管的输入端与所述扫描信号连接，所述第一开关管的输出端输出所述扫描信号；所述第一开关管的控制端与所述第二开关管的输入端连接，所述第二开关管的输出端接地，所述第二开关管的控制端与第一消角控制信号连接；所述第三开关管的输入端与所述第一开关管的输出端连接，所述第三开关管的输出端通过所述消角电阻接地，所述第三开关管的控制端与第二消角控制信号连接。
    Figure TP140566PCT-appb-I000001
  7. 根据权利要求6所述的驱动电路，其中所述第一消角控制信号与所述第二消角控制信号的电位极性相反；所述第一消角控制信号与所述第二消角控制信号为占空比等于0.5的方形波。
  8. 根据权利要求6所述的驱动电路，其中所述消角电路还包括：多个第四开关管以及消角选择芯片；
    所述消角选择芯片根据显示画面的灰阶范围，向相应的第四开关管发送导通信号，以对所述扫描信号进行消角处理；
    所述第四开关管的输入端与所述第三开关管的输出端连接，所述第四开关管的控制端接收所述导通信号，所述第四开关管的输出端通过相应的所述消角电阻接地；
    Figure TP140566PCT-appb-I000001
    其中每个所述第四开关管对应的所述消角电阻的阻值均不同。
  9. 根据权利要求8所述的驱动电路，其中根据所述显示画面的所有像素的平均灰阶值，确定所述显示画面的灰阶范围。
  10. 根据权利要求8所述的驱动电路，其中根据所述显示画面的所有像素的灰阶分布情况，确定所述显示画面的灰阶范围。
  11. 根据权利要求6所述的驱动电路，其中，
    Figure TP140566PCT-appb-I000001
    当所述驱动电路进行像素充电处理时，所述第二开关管导通；所述第一开关管导通，所述第一开关管输出扫描信号；所述第三开关管断开，所述扫描信号输入到相应的扫描线中；
    当所述驱动电路进行所述扫描信号的消角处理时，所述第二开关管断开，所述第一开关管也断开，所述第三开关管导通， 所述扫描信号通过所述第三开关管以及相应的所述消角电阻进行降压处理。
    Figure TP140566PCT-appb-I000001
  12. 一种液晶显示装置，其包括：液晶显示面板、背光源以及驱动电路；
    所述驱动电路包括：
    扫描信号驱动芯片，用于提供扫描信号；
    数据信号驱动芯片，用于提供数据信号；以及
    消角电路，用于对扫描信号进行消角处理，以消除扫描信号关闭时造成的像素充电电压损耗；包括：
    第一开关管，用于输入扫描信号；
    第二开关管，用于控制所述第一开关管的导通或断开；以及
    第三开关管，用于对所述扫描信号进行消角处理；
    其中所述第三开关管通过消角电阻对所述扫描信号进行降压处理，以对所述扫描信号进行消角处理。
    Figure TP140566PCT-appb-I000001
  13. 根据权利要求12所述的液晶显示装置，其中所述第一开关管的输入端与所述扫描信号连接，所述第一开关管的输出端输出所述扫描信号；所述第一开关管的控制端与所述第二开关管的输入端连接，所述第二开关管的输出端接地，所述第二开关管的控制端与第一消角控制信号连接；所述第三开关管的输入端与所述第一开关管的输出端连接，所述第三开关管的输出端通过所述消角电阻接地，所述第三开关管的控制端与第二消角控制信号连接。
    Figure TP140566PCT-appb-I000001
  14. 根据权利要求13所述的液晶显示装置，其中所述第一消角控制信号与所述第二消角控制信号的电位极性相反；所述第一消角控制信号与所述第二消角控制信号为占空比等于0.5的方形波。
  15. 根据权利要求13所述的液晶显示装置，其中所述消角电路还包括：多个第四开关管以及消角选择芯片；
    所述消角选择芯片根据显示画面的灰阶范围，向相应的第四开关管发送导通信号，以对所述扫描信号进行消角处理；
    所述第四开关管的输入端与所述第三开关管的输出端连接，所述第四开关管的控制端接收所述导通信号，所述第四开关管的输出端通过相应的所述消角电阻接地；
    Figure TP140566PCT-appb-I000001
    其中每个所述第四开关管对应的所述消角电阻的阻值均不同。
  16. 根据权利要求15所述的液晶显示装置，其中根据所述显示画面的所有像素的平均灰阶值，确定所述显示画面的灰阶范围。
  17. 根据权利要求15所述的液晶显示装置，其中根据所述显示画面的所有像素的灰阶分布情况，确定所述显示画面的灰阶范围。
  18. 根据权利要求13所述的液晶显示装置，其中，
    当所述驱动电路进行像素充电处理时，所述第二开关管导通；所述第一开关管导通，所述第一开关管输出扫描信号；所述第三开关管断开，所述扫描信号输入到相应的扫描线中；
    Figure TP140566PCT-appb-I000001
    当所述驱动电路进行所述扫描信号的消角处理时，所述第二开关管断开，所述第一开关管也断开，所述第三开关管导通， 所述扫描信号通过所述第三开关管以及相应的所述消角电阻进行降压处理。
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