WO2016201786A1 - 驱动方法、驱动装置及显示装置 - Google Patents

驱动方法、驱动装置及显示装置 Download PDF

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Publication number
WO2016201786A1
WO2016201786A1 PCT/CN2015/088160 CN2015088160W WO2016201786A1 WO 2016201786 A1 WO2016201786 A1 WO 2016201786A1 CN 2015088160 W CN2015088160 W CN 2015088160W WO 2016201786 A1 WO2016201786 A1 WO 2016201786A1
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Prior art keywords
voltage
high level
scan
level voltage
driving
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English (en)
French (fr)
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康志聪
陈黎暄
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/787,832 priority Critical patent/US20170162166A1/en
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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
    • 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
    • G09G3/3674—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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data 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
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular to a driving method and a driving device and a display device using the same.
  • a driving method for driving a display panel comprising:
  • each scan line in the display panel And outputting a scan driving signal to each scan line in the display panel, the scan drive signal comprising a plurality of frame signals periodically distributed, each frame signal comprising:
  • the second voltage is an alternating voltage
  • the second voltage is a second low level voltage and a second high level voltage that are alternately output
  • the first high level voltage is greater than the second high level voltage.
  • the first voltage further includes a chamfer voltage that is linear or non-linearly falling after the first high level voltage.
  • the voltage of the first voltage ranges from 27V to 33V.
  • the second low level voltage is greater than or equal to -4V, and the second high level voltage is less than or equal to 4V.
  • the intermediate potential of the second low level voltage and the second high level voltage is zero potential.
  • the scan driving signal has a frame period of 1/60 s.
  • the second low voltage or the second high level voltage period of the second voltage is less than or equal to a period of the first high level voltage of the first voltage.
  • the second low voltage and the second high level voltage are maintained for the same time as the first high level voltage.
  • the method further comprises:
  • a driving device comprising:
  • a scan line driving circuit electrically connected to the scan line for providing a scan driving signal to the scan line
  • a video line number line driving circuit electrically connected to the video signal line for providing a video signal to the video signal line;
  • timing control circuit for controlling timing of providing signals in the scanning signal line driving circuit and the video signal line driving circuit
  • the scan line driving circuit outputs a scan driving signal to each scan line in the display panel, and the scan driving signal includes a plurality of frame signals periodically distributed, and each frame signal includes:
  • the second voltage is an alternating voltage
  • the second voltage is a second low level voltage and a second high level voltage that are alternately output
  • the first high level voltage is greater than the second high level voltage.
  • a display device includes a display panel and a driving device for driving the display panel, wherein:
  • the display panel includes a plurality of cross-configured scan lines and video signal lines;
  • the driving device includes:
  • a scan line driving circuit electrically connected to the scan line for providing a scan driving signal to the scan line
  • a video line number line driving circuit electrically connected to the video signal line for providing a video signal to the video signal line;
  • timing control circuit for controlling timing of providing signals in the scanning signal line driving circuit and the video signal line driving circuit
  • the scan line driving circuit outputs a scan driving signal to each scan line in the display panel, and the scan driving signal includes a plurality of frame signals periodically distributed, and each frame signal includes:
  • the second voltage is an alternating voltage
  • the second voltage is a second low level voltage and a second high level voltage that are alternately output
  • the first high level voltage is greater than the second high level voltage.
  • the present invention can effectively improve the variation of the leakage current of the TFT in the display panel by changing the second voltage that maintains the scanning line off to the second low-level voltage and the second high-level voltage that are alternately output, thereby improving the appearance of the display device.
  • the phenomenon of afterimage, and the driving method is simple and easy to implement.
  • FIG. 1 is a schematic view showing the structure of a display device in the present invention.
  • FIG. 2 is a schematic structural view of a display panel in the present invention.
  • FIG. 3 is a voltage waveform diagram of a scan driving signal in the prior art.
  • Fig. 4 is a view showing a voltage waveform of a scan driving signal in the first embodiment of the present invention.
  • the display device of the present invention includes a display panel 15 and a driving device 10 for driving the display panel.
  • the display panel 15 includes a plurality of cross-configured scan lines and video signal lines.
  • the driving device includes:
  • the scan line driving circuit 12 is electrically connected to the scan line for providing a scan driving signal to the scan line;
  • the video line number line driving circuit 13 is electrically connected to the video signal line for providing a video signal to the video signal line;
  • the timing control circuit 11 is for controlling timing of providing signals in the scanning signal line driving circuit and the video signal line driving circuit.
  • the driving apparatus of the present invention further includes a power supply circuit 14 for supplying power to the timing control circuit 11, the scanning line driving circuit 12, and the video signal line driving circuit 13.
  • FIG. 15 A partial schematic view of the display panel 15 is shown in FIG.
  • the display panel is described by taking a liquid crystal display panel as an example.
  • the display panel may be an EL display panel, a plasma display panel, or the like.
  • the display panel 15 includes a TFT substrate (not shown), a scanning line 151 on the TFT substrate, a video line number line, a retention capacitor line 153, a TFT 154, and a pixel electrode 155 and a counter electrode Com.
  • the display panel 15 may further include a color filter, a polarizing plate, an alignment film, and the like.
  • the gate terminal of the TFT 154 is connected to the scan line 151, and the source terminal and the video signal line 152 are connected.
  • the drain terminal is connected to the retention capacitor wire 153 via a holding capacitor (not shown).
  • the terminal connected to the video signal line 512 is referred to as a source terminal for two terminals other than the gate terminal among the three terminals of the TFT 154, and passes through the storage capacitor and the storage capacitor wiring 153.
  • the connected terminals are called drain terminals, and of course, the source and drain terminals can also be interchanged.
  • the semiconductor layer of the TFT 154 in the present invention is generally formed of, for example, a-Si (amorphous silicon), but is not limited thereto, and may be formed of crystalline silicon or other materials.
  • the scan line 151 supplies the scan driving signal supplied from the scan signal drive circuit 12 to the connected TFT 154.
  • the video signal line 152 supplies the video signal supplied from the video signal line drive circuit 13 to the pixel electrode 155 via the connected TFT 154.
  • FIG. 3 is a voltage waveform diagram of a scan driving signal applied on a scan line in the prior art.
  • the scan driving signal includes a plurality of frame signals periodically distributed, and each frame period includes:
  • the second voltage Vgl at which each scan line is turned off is maintained during the second period of time, and the second voltage Vgl is a DC low level voltage.
  • the scan driving signal is sent to the corresponding pixel electrode. Due to the existence of the storage capacitor, after the scan driving signal is lowered from Vgh to Vgl to turn off the TFT, the voltage of the liquid crystal capacitor can be maintained unchanged. Maintaining a stable display, this is the basic driving principle of LCD display devices.
  • the frame period of the driving signal is 1/60 s
  • the magnitude of the first voltage Vgh is 27V to 33V
  • the magnitude of the second voltage Vgl is -6V
  • the first voltage Vgh further includes the first high voltage.
  • a chamfer voltage that decreases linearly or nonlinearly after the level voltage Vgh, and the voltage at which the chamfer voltage drops is 10 to 15V.
  • increasing the voltage of Vgl will help improve the afterimage, but the increase of Vgl is likely to cause an increase in the dark current of the TFT, affecting the performance of the TFT and the effect of the LCD display.
  • the scan line driving circuit outputs a scan driving signal to each scan line in the display panel.
  • the scan driving signal includes a plurality of frame signals periodically distributed, and each frame period includes:
  • the second voltage Vgl is an alternating voltage
  • the second voltage Vgl is a second low level voltage Vgl1 and a second high level voltage Vgl2 that are alternately output
  • the first high level voltage Vgh is greater than the second high level voltage Vgl2.
  • the first voltage further includes linear or nonlinear after the first high level voltage Vgh The reduced chamfer voltage.
  • the chamfering voltage is to solve the feed through, and the delay of the scanning line signal causes the capacitive coupling voltage difference between the near end and the far end to be different, so that the uniformity in the display panel is deteriorated. Therefore, based on the low-pass filter principle, reducing the high-frequency portion of the scan line signal can make the capacitive coupling voltage difference between the near end and the far end close, and at the same time, the voltage difference between the near end and the far end can be reduced.
  • the frame period of the scan driving signal is 1/60 s
  • the voltage range of the first high level voltage Vgh is 27V to 33V
  • the chamfering voltage is linearly decreased
  • the falling amplitude is 10 to 15V
  • the voltage Vgl1 is equal to -4V
  • the second high level voltage Vgl2 is equal to 4V
  • the intermediate potential of the second low level voltage Vgl1 and the second high level voltage Vgl2 is 0 potential.
  • the Vgl changes from the original DC mode (-6V) to the AC drive mode, and the conversion period (the time during which the second low-level voltage Vgl1 and the second high-level voltage Vgl2 are maintained) and the first voltage (the first high level voltage Vgh is equal to the chamfer voltage) for the length of time maintained, so that between the two high-level turns of the scan drive signal, the low-level signal periodically changes in high and low, and the range of variation is substantially Between (-4V and +4V), it varies depending on the LCD.
  • the change of the second low level voltage Vgl1 and the second high level voltage Vgl2 is between the opening of the TFT and the opening of the TFT of the next frame, so the frequency of change should be greater than the driving frequency of the display panel.
  • the second voltage (the second low level voltage Vgl1 and the second high level voltage Vgl2) has a frequency of change of at least 120 Hz.
  • the frequency change can improve the IS effect, and its amplitude will also affect the IS effect, but the effect of the two is not a simple function, but an optimal solution needs to be found through a large number of experiments.
  • the amplitude of the second voltage should not be too high, otherwise the leakage current will increase.
  • the second voltage of the direct current is converted into an alternating current voltage, so that the scanning line is turned on twice. Between, the voltage is partially higher than the original Vgl voltage, and by changing the second voltage Vgl into a high-frequency AC drive, the image sticking phenomenon occurring in the display device can be improved.
  • the first voltage may be only the first high level voltage Vgh, and does not include the chamfer voltage, and the rest are the same as those in the first embodiment, and details are not described herein, and the display device may also be improved.
  • the intermediate potential of the second low level voltage Vgl2 and the second high level voltage Vgl2 is a non-zero potential, that is, an absolute value of the voltage levels of the second low level voltage Vgl2 and the second high level voltage Vgl2.
  • the second low level voltage Vgl2 and the second high level voltage Vgl2 are respectively -2V and 6V, or 0V and 8V, or -6V and 2V, or -8V and 0V, etc., as long as the second low is satisfied
  • the level voltage Vgl2 and the second high level voltage Vgl2 may be alternately converted to form an alternating current voltage, and the rest are the same as in the first embodiment, and the image sticking phenomenon occurring in the display device can be improved as well.
  • the low level signal voltage varies from -3V to +3V.
  • the present invention can effectively improve the leakage current of the TFT in the display panel by changing the second voltage that maintains the scan line off to the second low voltage and the second high voltage that are alternately outputted.
  • the change thereby improving the image sticking phenomenon occurring in the display device, is simple and easy to implement.

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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)
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Abstract

一种驱动方法、驱动装置(10)及显示装置，该驱动方法用于驱动显示面板(15)，所述驱动方法包括：对显示面板(15)中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为直流的第一高电平电压(Vgh)；在第二时间段内维持每一扫描线关闭的第二电压(Vgl)，第二电压(Vgl)为交流电压，第二电压(Vgl)为交替输出的第二低电平电压(Vgl1)和第二高电平电压(Vgl2)；其中，第一高电平电压(Vgh)大于第二高电平电压(Vgl2)。通过将维持扫描线关闭的第二电压(Vgl)变为交替输出的第二低电平电压(Vgl1)和第二高电平电压(Vgl2)，能够有效改善显示面板(15)中TFT的漏电流的变化，进而改善显示装置中出现的残影现象，且驱动方法简单。

Description

驱动方法、驱动装置及显示装置 技术领域
本发明涉及液晶显示技术领域，特别是涉及一种驱动方法及应用该驱动方法的驱动装置和显示装置。
背景技术
“残像”即影像残留(Image Sticking)是一种在LCD显示器上常见的不良现象，是在屏幕上长时间保持一幅静止的画面，液晶由于受到长时间的驱动被极化，造成液晶分子不能在信号电压控制下正常偏转。过一段时间，即便改变显示画面的内容，屏幕上仍然可以看到以前那个静止图像的痕迹。按画面切换后出现的残像状态不同，残像可分为面残像(Area sticking)和线残像(Line Ship sticking)两种。
当对液晶分子施加正向电压的时候，由于耦合电压以及寄生电压的作用，在Gate信号的下降沿，即Gate信号消失的时候，Pixel的充电电量有一个微弱的下降过程，使Pixel内一部分所持有的电压有损耗，而当对液晶子施加反向电流充电的时候，也可以发现在充电结束后，电压也存在略微的损失。由于以上原因，因此在一次充放电结束后，Pixel在相对方向上就存在了电压的不对称性，在LCD充放电的时候，在液晶盒内就会不可避免的产生DC，当这个残留DC足够大的时候，就会造成液晶分子不受信号电压的驱动，从而产生面残像。
由于存在极性电场导致的残影现象，业界往往采用正负极性反转的电压驱动方式来改善这一现象。但由于材料污染、制程不良或其他原因，影像残留现 象在长时间显示固定静态画面时屡有发生。
因此，针对上述技术问题，有必要提供一种驱动方法、驱动装置及显示装置。
发明内容
为克服现有技术的不足，本发明的目的在于提供一种改善残像现象的驱动方法、驱动装置及显示装置。
为了实现上述目的，本发明实施例提供的技术方案如下：
一种驱动方法，用于驱动显示面板，所述驱动方法包括：
对显示面板中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：
在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为直流的第一高电平电压；
在第二时间段内维持每一扫描线关闭的第二电压，所述第二电压为交流电压，第二电压为交替输出的第二低电平电压和第二高电平电压；
其中，所述第一高电平电压大于所述第二高电平电压。
作为本发明的进一步改进，所述第一电压还包括位于第一高电平电压后的呈线性或非线性下降的削角电压。
作为本发明的进一步改进，所述第一电压的电压范围为27V～33V。
作为本发明的进一步改进，所述第二低电平电压大于或等于-4V，所述第二高电平电压小于或等于4V。
作为本发明的进一步改进，所述第二低电平电压和第二高电平电压的中间电位为0电位。
作为本发明的进一步改进，所述扫描驱动信号的帧周期为1/60s。
作为本发明的进一步改进，所述第二电压中第二低电平电压或第二高电平电压周期小于或等于第一电压中第一高电平电压的周期。
作为本发明的进一步改进，所述第二低电平电压和第二高电平电压所维持的时间与第一高电平电压所维持的时间相同。
作为本发明的进一步改进，所述方法还包括：
在第n条扫描线上扫描驱动信号第一电压扫描驱动完成时，第n+1条扫描线上扫描驱动信号第一电压开始进行扫描驱动。
相应地，一种驱动装置，所述驱动装置包括：
扫描线驱动电路，与扫描线电性连接，用于向扫描线提供扫描驱动信号；
视频线号线驱动电路，与视频信号线电性连接，用于向视频信号线提供视频信号；
定时控制电路，用于控制所述扫描信号线驱动电路和视频信号线驱动电路中的信号的提供定时；
其中，所述扫描线驱动电路对显示面板中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：
在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为直流的第一高电平电压；
在第二时间段内维持每一扫描线关闭的第二电压，所述第二电压为交流电压，第二电压为交替输出的第二低电平电压和第二高电平电压；
其中，所述第一高电平电压大于所述第二高电平电压。
相应地，一种显示装置，所述显示装置包括显示面板、以及驱动所述显示面板的驱动装置，其中：
所述显示面板包括若干交叉配置的扫描线和视频信号线；
所述驱动装置包括：
扫描线驱动电路，与扫描线电性连接，用于向扫描线提供扫描驱动信号；
视频线号线驱动电路，与视频信号线电性连接，用于向视频信号线提供视频信号；
定时控制电路，用于控制所述扫描信号线驱动电路和视频信号线驱动电路中的信号的提供定时；
其中，所述扫描线驱动电路对显示面板中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：
在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为直流的第一高电平电压；
在第二时间段内维持每一扫描线关闭的第二电压，所述第二电压为交流电压，第二电压为交替输出的第二低电平电压和第二高电平电压；
其中，所述第一高电平电压大于所述第二高电平电压。
本发明通过将维持扫描线关闭的第二电压变为交替输出的第二低电平电压和第二高电平电压，能够有效改善显示面板中TFT的漏电流的变化，进而改善显示装置中出现的残影现象，且驱动方法简单，易于实现。
附图说明
图1为本发明中显示装置的结构示意图。
图2为本发明中显示面板的结构示意图。
图3为现有技术中扫描驱动信号的电压波形图。
图4为本发明实施例1中扫描驱动信号的电压波形图。
具体实施方式
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
参图1所示，本发明的显示装置包括显示面板15、以及驱动显示面板的驱动装置10，其中显示面板15包括若干交叉配置的扫描线和视频信号线，驱动装置包括：
扫描线驱动电路12，与扫描线电性连接，用于向扫描线提供扫描驱动信号；
视频线号线驱动电路13，与视频信号线电性连接，用于向视频信号线提供视频信号；
定时控制电路11，用于控制扫描信号线驱动电路和视频信号线驱动电路中的信号的提供定时。
进一步地，本发明中驱动装置还包括电源电路14，用于向定时控制电路11、扫描线驱动电路12和视频信号线驱动电路13提供电源。
参图2所示为显示面板15的局部示意图。此处显示面板以液晶显示面板为例进行说明，当然，该显示面板也可以为EL显示面板、等离子显示面板等。
显示面板15包括：TFT基板(未图示)，位于TFT基板上的扫描线151、视频线号线、保持电容配线153、TFT 154、以及像素电极155和相对电极Com。另外，显示面板15还可以包括彩色滤波片、偏振片、取向膜等。
其中，TFT154的栅极端子与扫描线151连接，源极端子与视频信号线152 连接，漏极端子经由保持电容(未图示)与保持电容配线153连接。此外，为了便于说明，对于TFT 154具备的3个端子中的栅极端子以外的两个端子，将与视频信号线512连接的端子称为源极端子，将经由保持电容与保持电容配线153连接的端子称为漏极端子，当然，源极端子和漏极端子也可以进行互换。
本发明中TFT 154的半导体层一般由例如a-Si(非晶硅)形成，但不限于此，也可以为晶体硅或其他材料形成。
扫描线151将从扫描信号驱动电路12提供的扫描驱动信号提供到所连接的TFT154。另外，视频信号线152将从视频信号线驱动电路13提供的视频信号经由所连接的TFT 154提供到像素电极155。
比较例：
参图3所示为现有技术中扫描线上施加的扫描驱动信号的电压波形图，扫描驱动信号包括周期分布的若干帧信号，每一帧信号(Frame Period)包括：
在第一时间段内维持每一扫描线选通的第一电压Vgh，第一电压Vgh为直流的第一高电平电压；
在第二时间段内维持每一扫描线关闭的第二电压Vgl，第二电压Vgl为直流低电平电压。
每一行的扫描线依次打开的同时，扫描驱动信号输送到对应的像素电极，由于存储电容的存在，在扫描驱动信号从Vgh下降到Vgl关闭TFT后，依然可以维持液晶电容的电压不变，从而维持稳定显示，这是LCD显示装置的基本驱动原理。
在该比较例中，描驱动信号的帧周期为1/60s，第一电压Vgh的大小为27V～33V，第二电压Vgl的大小为-6V，其中，第一电压Vgh还包括位于第一高 电平电压Vgh后的呈线性或非线性下降的削角电压，该削角电压下降的电压为10～15V。
然而当对液晶分子施加正向电压的时候，由于耦合电压以及寄生电压的作用，在扫描驱动信号的下降沿，即扫描驱动信号消失的时候，像素电极的充电电量有一个微弱的下降过程，使像素电极内一部分所持有的电压有损耗，而当对液晶子施加反向电流充电的时候，也可以发现在充电结束后，电压也存在略微的损失。由于以上原因，因此在一次充放电结束后，像素电极在相对方向上就存在了电压的不对称性，在LCD充放电的时候，在液晶盒内就会不可避免的产生DC，当这个残留DC足够大的时候，就会造成液晶分子不受信号电压的驱动，从而产生面残像。
在其他实施例中，提高Vgl的电压会有助于改善残像，但Vgl的提升又容易引起TFT暗电流的提升，影响TFT性能和LCD显示的效果。
实施例1：
扫描线驱动电路对显示面板中的每一扫描线输出一扫描驱动信号，参图4所示，扫描驱动信号包括周期分布的若干帧信号，每一帧信号(Frame Period)包括：
在第一时间段内维持每一扫描线选通的第一电压Vgh，第一电压Vgh为直流的第一高电平电压；
在第二时间段内维持每一扫描线关闭的第二电压Vgl，第二电压Vgl为交流电压，第二电压Vgl为交替输出的第二低电平电压Vgl1和第二高电平电压Vgl2；
其中，第一高电平电压Vgh大于第二高电平电压Vgl2。
进一步地，第一电压还包括位于第一高电平电压Vgh后的呈线性或非线性 下降的削角电压。
削角电压是为了解决馈通效应(feed through)，扫描线信号的延迟会使得近端和远端的电容耦合电压差不同，使得显示面板内的均匀性变差。因此，基于低通滤波器原理，减少扫描线信号高频部分，可以使得近端与远端的电容耦合电压差接近，同时，可以降低近端和远端的电压差。
本实施例中扫描驱动信号的帧周期为1/60s，第一高电平电压Vgh的电压范围为27V～33V，削角电压为线性下降，下降的幅度为10～15V，第二低电平电压Vgl1等于-4V，第二高电平电压Vgl2等于4V，且第二低电平电压Vgl1和第二高电平电压Vgl2的中间电位为0电位。
本实施例中，Vgl从原始的直流方式(-6V)变为交流驱动的方式，其变换周期(第二低电平电压Vgl1和第二高电平电压Vgl2所维持的时间)与第一电压(第一高电平电压Vgh与削角电压)维持的时间长度保持一致，于是在扫描驱动信号的两次高平打开之间，低平信号是周期性地发生高低变化的，其变化范围大致从(-4V～+4V)之间，依据不同的LCD而不同。
第二低电平电压Vgl1和第二高电平电压Vgl2的变化介于TFT打开与下一帧TFT打开之间，所以其变化频率应该大于显示面板的驱动频率。假设显示面板的驱动频率为60HZ，则第二电压(第二低电平电压Vgl1和第二高电平电压Vgl2)的变化频率至少为120HZ。其频率变化可以改善IS效果，其振幅也会影响IS效果，但这两者影响不是简单函数，而是通过大量实验需要发现一个最优解。同时第二电压的振幅不能过高，否则导致漏电流增大。
参图4所示，在第n条扫描线上扫描驱动信号第一电压扫描驱动完成时，第n+1条扫描线上扫描驱动信号第一电压开始进行扫描驱动，以此类推。
本实施例中将直流的第二电压变换成交流电压，使其在扫描线两次打开之 间，电压存在部分较原始Vgl电压要更高，通过将第二电压Vgl变换为高频交流驱动的方式，可以对改善显示装置中出现的残影现象。
实施例2：
进一步地，在本实施例中第一电压可以仅仅为第一高电平电压Vgh，而不包括削角电压，其余均与实施例1相同，在此不再进行赘述，同样可以改善显示装置中出现的残影现象。
实施例3：
在本实施例中，第二低电平电压Vgl2和第二高电平电压Vgl2的中间电位为非0电位，即第二低电平电压Vgl2和第二高电平电压Vgl2电压大小的绝对值不同，如第二低电平电压Vgl2和第二高电平电压Vgl2的大小分别为-2V和6V、或0V和8V、或-6V和2V、或-8V和0V等，只要满足第二低电平电压Vgl2和第二高电平电压Vgl2为交替变换形成交流电压即可，其余均与实施例1相同，同样可以改善显示装置中出现的残影现象。
进一步地，在一优选实施例中，低平信号电压变化范围为-3V～+3V。
由以上技术方案可以看出，本发明通过将维持扫描线关闭的第二电压变为交替输出的第二低电平电压和第二高电平电压，能够有效改善显示面板中TFT的漏电流的变化，进而改善显示装置中出现的残影现象，且驱动方法简单，易于实现。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落 在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。

Claims (11)

  1. 一种驱动方法，用于驱动显示面板，其中，所述驱动方法包括：
    对显示面板中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：
    在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为直流的第一高电平电压；
    在第二时间段内维持每一扫描线关闭的第二电压，所述第二电压为交流电压，第二电压为交替输出的第二低电平电压和第二高电平电压；
    其中，所述第一高电平电压大于所述第二高电平电压。
  2. 根据权利要求1所述的驱动方法，其中，所述第一电压还包括位于第一高电平电压后的呈线性或非线性下降的削角电压。
  3. 根据权利要求2所述的驱动方法，其中，所述第一电压的电压范围为27V～33V。
  4. 根据权利要求1所述的驱动方法，其中，所述第二低电平电压大于或等于-4V，所述第二高电平电压小于或等于4V。
  5. 根据权利要求4所述的驱动方法，其中，所述第二低电平电压和第二高电平电压的中间电位为0电位。
  6. 根据权利要求1所述的驱动方法，其中，所述扫描驱动信号的帧周期为1/60s。
  7. 根据权利要求6所述的驱动方法，其中，所述第二电压中第二低电平电压或第二高电平电压周期小于或等于第一电压中第一高电平电压的周期。
  8. 根据权利要求1所述的驱动方法，其中，所述第二低电平电压和第二高电平电压所维持的时间与第一高电平电压所维持的时间相同。
  9. 根据权利要求1所述的驱动方法，其中，所述方法还包括：
    在第n条扫描线上扫描驱动信号第一电压扫描驱动完成时，第n+1条扫描线上扫描驱动信号第一电压开始进行扫描驱动。
  10. 一种驱动装置，其中，所述驱动装置包括：
    扫描线驱动电路，与扫描线电性连接，用于向扫描线提供扫描驱动信号；
    视频线号线驱动电路，与视频信号线电性连接，用于向视频信号线提供视频信号；
    定时控制电路，用于控制所述扫描信号线驱动电路和视频信号线驱动电路中的信号的提供定时；
    其中，所述扫描线驱动电路对显示面板中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：
    在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为直流的第一高电平电压；
    在第二时间段内维持每一扫描线关闭的第二电压，所述第二电压为交流电压，第二电压为交替输出的第二低电平电压和第二高电平电压；
    其中，所述第一高电平电压大于所述第二高电平电压。
  11. 一种显示装置，其中，所述显示装置包括显示面板、以及驱动所述显示面板的驱动装置，其中：
    所述显示面板包括若干交叉配置的扫描线和视频信号线；
    所述驱动装置包括：
    扫描线驱动电路，与扫描线电性连接，用于向扫描线提供扫描驱动信号；
    视频线号线驱动电路，与视频信号线电性连接，用于向视频信号线提供视频信号；
    定时控制电路，用于控制所述扫描信号线驱动电路和视频信号线驱动电路中的信号的提供定时；
    其中，所述扫描线驱动电路对显示面板中的每一扫描线输出一扫描驱动信号，所述扫描驱动信号包括周期分布的若干帧信号，每一帧信号包括：
    在第一时间段内维持每一扫描线选通的第一电压，所述第一电压为第一高电平电压；
    在第二时间段内维持每一扫描线关闭的第二电压，所述第二电压为交流电压，第二电压为交替输出的第二低电平电压和第二高电平电压；
    其中，所述第一高电平电压大于所述第二高电平电压。
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