WO2020042396A1 - 一种像素驱动电路、显示面板及显示装置 - Google Patents

一种像素驱动电路、显示面板及显示装置 Download PDF

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Publication number
WO2020042396A1
WO2020042396A1 PCT/CN2018/117389 CN2018117389W WO2020042396A1 WO 2020042396 A1 WO2020042396 A1 WO 2020042396A1 CN 2018117389 W CN2018117389 W CN 2018117389W WO 2020042396 A1 WO2020042396 A1 WO 2020042396A1
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Prior art keywords
thin film
film transistor
display panel
control
liquid crystal
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PCT/CN2018/117389
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English (en)
French (fr)
Inventor
廖作敏
张典
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武汉华星光电技术有限公司
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Priority to US16/603,241 priority Critical patent/US10923058B2/en
Publication of WO2020042396A1 publication Critical patent/WO2020042396A1/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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

Definitions

  • the present invention relates to the field of display technology, and in particular, to a pixel driving circuit, a display panel, and a display device.
  • LTPS and TFT LCD are widely used in the display field.
  • the panel test (Cell test, CT) lighting method is usually used to detect problems in the panel manufacturing process.
  • cell test, CT Cell test, CT
  • non-in-cell (without touch function in the panel) products are prone to ion residues, which causes pixel voltages to drift during the CT lighting process, making it impossible to effectively detect the panel.
  • the existing solution is to reduce the ion residue by powering down.
  • the scan signal drops during the power-off process, which easily causes the feedthrough of the capacitor's upper plate, which causes the pixel voltage to shift, such as from 5V to 4.8. V, which causes a splash screen to appear when the display panel is turned on again after a power failure, reducing the display effect.
  • An object of the present invention is to provide a pixel driving circuit, a display panel, and a display device, which can prevent a splash screen from appearing when the display panel is turned on again after a power failure, and improve the display effect.
  • the present invention provides a pixel driving circuit, which includes:
  • Driving a thin film transistor, a liquid crystal capacitor, a storage capacitor, and a voltage stabilizing module the gate of the driving thin film transistor is connected to a scanning signal; the source of the driving thin film transistor is connected to a data signal;
  • the upper electrode plate of the storage capacitor is connected to the drain of the driving thin film transistor, and the lower electrode plate of the liquid crystal capacitor and the lower electrode plate of the storage capacitor are both connected to a voltage stabilizing module.
  • the voltage stabilizing module includes a control thin film transistor, and the voltage stabilizing module is configured to control the control thin film transistor to be turned off according to a control signal when the display panel is powered off, so that the liquid crystal The voltage difference between the two electrode plates of the capacitor and the voltage difference between the two electrode plates of the storage capacitor remain constant.
  • a period of the control signal is synchronized with a period of the scan signal.
  • both the scanning signal and the control signal are changed from a high level to a low level.
  • the voltage stabilizing module is further configured to control the control thin film transistor to close according to the control signal when the display panel is in operation, so as to supply the lower electrode plate of the liquid crystal capacitor and the storage.
  • the lower plate of the capacitor provides a common voltage.
  • the voltage stabilizing module includes a control thin film transistor, a gate of the control thin film transistor is connected to the control signal, a source of the control thin film transistor is connected to a common voltage, and the control The drain of the thin film transistor is connected to the lower electrode plate of the liquid crystal capacitor and the lower electrode plate of the storage capacitor, respectively.
  • the common voltage drops at a first moment
  • the control signal changes from a high level to a low level at a second moment
  • the first moment is earlier than the second moment
  • the common voltage drops at a first moment
  • the control signal changes from a high level to a low level at a second moment
  • the second moment is earlier than the first moment
  • the present invention also provides a display panel including a pixel driving circuit, including:
  • Driving a thin film transistor, a liquid crystal capacitor, a storage capacitor, and a voltage stabilizing module the gate of the driving thin film transistor is connected to a scanning signal; the source of the driving thin film transistor is connected to a data signal;
  • the upper electrode plate of the storage capacitor is connected to the drain of the driving thin film transistor, and the lower electrode plate of the liquid crystal capacitor and the lower electrode plate of the storage capacitor are both connected to a voltage stabilizing module.
  • the voltage stabilizing module includes a control thin film transistor, and the voltage stabilizing module is configured to control the control thin film transistor to be turned off according to a control signal when the display panel is powered off, so that the liquid crystal capacitor The voltage difference between the two electrode plates of the capacitor and the voltage difference between the two electrode plates of the storage capacitor are kept constant.
  • a period of the control signal is synchronized with a period of the scan signal.
  • both the scanning signal and the control signal are changed from a high level to a low level.
  • the voltage stabilizing module is further configured to control the control thin film transistor to close according to the control signal when the display panel is in operation, so as to supply the lower electrode plate of the liquid crystal capacitor and the storage capacitor.
  • the lower plate provides a common voltage.
  • the voltage stabilizing module includes a control thin film transistor, a gate of the control thin film transistor is connected to the control signal, a source of the control thin film transistor is connected to a common voltage, and the control film is The drain of the transistor is connected to the lower electrode plate of the liquid crystal capacitor and the lower electrode plate of the storage capacitor, respectively.
  • the common voltage drops at a first moment
  • the control signal changes from a high level to a low level at a second moment
  • the first moment is earlier than the second moment
  • the common voltage drops at a first moment
  • the control signal changes from a high level to a low level at a second moment
  • the second moment is earlier than the first moment
  • the present invention also provides a display device including the above display panel.
  • the pixel driving circuit, the display panel and the display device of the present invention can increase the voltage difference between the two electrode plates of the liquid crystal capacitor when the display panel is powered off by adding a voltage stabilizing module to the existing pixel driving circuit.
  • the voltage difference between the two electrode plates of the storage capacitor is kept constant, thereby avoiding the flickering phenomenon when the display panel is re-opened, and improving the display effect.
  • FIG. 1 is a schematic structural diagram of a conventional pixel driving circuit
  • FIG. 2 is a schematic structural diagram of a pixel driving circuit according to the present invention.
  • FIG. 3 is a timing diagram of a first junction of a pixel driving circuit according to the present invention.
  • FIG. 4 is a second junction timing diagram of the pixel driving circuit of the present invention.
  • a conventional pixel driving circuit includes a driving thin film transistor T1, a liquid crystal capacitor C1, and a storage capacitor C2.
  • a gate of the driving thin film transistor T1 is connected to a scanning line 12, and a scanning signal is input to the scanning line 12, and
  • the source of the driving thin film transistor T1 is connected to the data line 11, and an input data signal is input to the data line 11.
  • the upper electrode plate of the liquid crystal capacitor C1 and the upper electrode plate of the storage capacitor C2 are both connected to the drain of the driving thin film transistor T1, and the lower electrode plate of the liquid crystal capacitor C1 and the lower electrode of the storage capacitor C2 are connected.
  • the boards are connected to the common voltage COM.
  • FIG. 2 is a schematic structural diagram of a pixel driving circuit according to the present invention.
  • the pixel driving circuit of the present invention includes a driving thin film transistor T1, a liquid crystal capacitor C1, a storage capacitor C2, and a voltage stabilization module 13.
  • the gate of the driving thin film transistor T1 is connected to a scanning line 12, and the scanning line 12 is input with The scan signal gate, the source of the driving thin film transistor T1 is connected to the data line 11, and the data line 11 is input with the access data signal Data.
  • the upper electrode plate of the liquid crystal capacitor C1 and the upper electrode plate of the storage capacitor C2 are both connected to the drain of the driving thin film transistor T1, and the lower electrode plate of the liquid crystal capacitor C1 and the lower electrode of the storage capacitor C2 are connected.
  • the boards are all connected to a voltage stabilizing module 13, wherein the voltage stabilizing module 13 is configured to make the voltage difference between the two plates of the liquid crystal capacitor C1 and the two plates of the storage capacitor C2 when the display panel is powered off. The pressure difference between them remains constant.
  • the voltage stabilizing module 13 includes a control thin film transistor T2, and the voltage stabilizing module 13 is configured to control the control thin film transistor T2 to be turned off according to a control signal COMEN to make the liquid crystal capacitor C1 when the display panel is powered off.
  • the voltage difference between the two electrode plates and the voltage difference between the two electrode plates of the storage capacitor C2 are kept constant.
  • the voltage stabilizing module 13 is further configured to provide a common voltage COM to the lower electrode plate of the liquid crystal capacitor C1 and the lower electrode plate of the storage capacitor C2 during the operation of the display panel.
  • the voltage stabilizing module 13 is specifically configured to control the control thin film transistor T2 to close according to the control signal COMEN to lower the liquid crystal capacitor C1 and the storage capacitor C2.
  • the plates provide a common voltage.
  • the voltage stabilizing module 13 includes a control thin film transistor T2, a gate of the control thin film transistor T2 is connected to the control signal COMEN, a source of the control thin film transistor T2 is connected to a common voltage COM, and the control thin film The drain of the transistor T2 is connected to the lower electrode plate of the liquid crystal capacitor C1 and the lower electrode plate of the storage capacitor C2, respectively.
  • the period of the control signal COMEN is synchronized with the period of the scan signal gate.
  • the scan signal gate and the control signal COMEN are both changed from a high level to a low level.
  • the scan signal gate and the control signal COMEN are both at a high level.
  • the common voltage COM drops at a first time (time t1), and the control signal COMEN changes from a high level to a low level at a second time (time t2), so The first time is earlier than the second time, that is, t1 is earlier than t2.
  • the common voltage COM decreases at a first time (time t3), and the control signal COMEN changes from a high level to a low level at a second time (time t2),
  • the first time is later than the second time, and t2 is earlier than t3. That is, the COM signal drops to the GND potential before the gate / COMEN signal drops, or the COM signal falls to the GND potential after the gate / COMEN signal drops.
  • the scanning signal decreases, which affects the upper plate of the liquid crystal capacitor and the storage capacitor, and causes the voltage on the upper plate of the capacitor to shift; at this time, the control signal also decreases synchronously, thereby affecting the two capacitors.
  • the lower electrode plate has an effect, so that the voltage of the lower electrode plate also has the same shift. Because the voltage of the upper and lower electrode plates is shifted at the same time, the pressure difference between the two electrode plates is kept constant, thereby avoiding the phenomenon of flashing.
  • the present invention also provides a display panel including any one of the pixel driving circuits described above.
  • the present invention also provides a display device including the above display panel.
  • the pixel driving circuit, the display panel and the display device of the present invention can increase the voltage difference between the two electrode plates of the liquid crystal capacitor when the display panel is powered off by adding a voltage stabilizing module to the existing pixel driving circuit.
  • the voltage difference between the two electrode plates of the storage capacitor is kept constant, thereby avoiding the flickering phenomenon when the display panel is re-opened, and improving the display effect.

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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)
  • Power Engineering (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

一种像素驱动电路、显示面板及显示装置，像素驱动电路包括：液晶电容（C1）的上极板和存储电容（C2）的上极板均与驱动薄膜晶体管（T1）的漏极连接，液晶电容（C1）的下极板和存储电容（C2）的下极板均与稳压模块（13）连接，在显示面板断电时，稳压模块（13）使液晶电容（C1）的两极板之间的压差和存储电容（C2）的两极板之间的压差保持恒定。

Description

一种像素驱动电路、显示面板及显示装置 技术领域
本发明涉及显示技术领域，特别是涉及一种像素驱动电路、显示面板及显示装置。
 背景技术
LTPS、TFT LCD广泛应用于显示领域，在LTPS、TFT LCD制作过程中，通常采用面板测试（Cell test，CT）点灯方式来检测面板制程中出现的问题。然而，由于馈穿（feedthrough）原因，使得非in-cell（面板内不具有触摸功能）的产品容易出现离子残留，从而导致CT点灯过程中像素电压出现漂移，进而无法对面板进行有效检测。
 技术问题
现有的解决方法是采用断电的方式来减少离子残留，然而在断电过程中扫描信号下降容易对电容的上极板产生馈穿现象，使得像素电压出现偏移，比如由5V下降为4.8V，从而导致显示面板在断电后重新开启时出现闪屏，降低了显示效果。
 技术解决方案
本发明的目的在于提供一种像素驱动电路、显示面板及显示装置，能够防止显示面板在断电后重新开启时出现闪屏，提高了显示效果。
为解决上述技术问题，本发明提供一种像素驱动电路，其包括：
驱动薄膜晶体管、液晶电容、存储电容以及稳压模块，所述驱动薄膜晶体管的栅极接入扫描信号，所述驱动薄膜晶体管的源极接入数据信号，所述液晶电容的上极板和所述存储电容的上极板均与所述驱动薄膜晶体管的漏极连接，所述液晶电容的下极板和所述存储电容的下极板均与稳压模块连接，其中所述稳压模块用于在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定。
在本发明的像素驱动电路中，所述稳压模块包括控制薄膜晶体管，所述稳压模块用于在显示面板断电时，根据控制信号控制所述控制薄膜晶体管断开，以使所述液晶电容的两极板之间压差和所述存储电容的两极板之间压差保持恒定。
在本发明的像素驱动电路中，所述控制信号的周期与所述扫描信号的周期同步。
在本发明的像素驱动电路中，在所述显示面板断电期间，所述扫描信号和所述控制信号均由高电平变为低电平。
在本发明的像素驱动电路中，所述稳压模块还用于在显示面板工作时，根据所述控制信号控制所述控制薄膜晶体管闭合，以向所述液晶电容的下极板和所述存储电容的下极板提供公共电压。
在本发明的像素驱动电路中，所述稳压模块包括控制薄膜晶体管，所述控制薄膜晶体管的栅极接入所述控制信号，所述控制薄膜晶体管的源极接入公共电压，所述控制薄膜晶体管的漏极分别与所述液晶电容的下极板和所述存储电容的下极板连接。
在本发明的像素驱动电路中，所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第一时刻早于第二时刻。
在本发明的像素驱动电路中，所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第二时刻早于第一时刻。
本发明还提供一种显示面板，其包括像素驱动电路，其包括：
驱动薄膜晶体管、液晶电容、存储电容以及稳压模块，所述驱动薄膜晶体管的栅极接入扫描信号，所述驱动薄膜晶体管的源极接入数据信号，所述液晶电容的上极板和所述存储电容的上极板均与所述驱动薄膜晶体管的漏极连接，所述液晶电容的下极板和所述存储电容的下极板均与稳压模块连接，其中所述稳压模块用于在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定。
在本发明的显示面板中，所述稳压模块包括控制薄膜晶体管，所述稳压模块用于在显示面板断电时，根据控制信号控制所述控制薄膜晶体管断开，以使所述液晶电容的两极板之间压差和所述存储电容的两极板之间压差保持恒定。
在本发明的显示面板中，所述控制信号的周期与所述扫描信号的周期同步。
在本发明的显示面板中，在所述显示面板断电期间，所述扫描信号和所述控制信号均由高电平变为低电平。
在本发明的显示面板中，所述稳压模块还用于在显示面板工作时，根据所述控制信号控制所述控制薄膜晶体管闭合，以向所述液晶电容的下极板和所述存储电容的下极板提供公共电压。
在本发明的显示面板中，所述稳压模块包括控制薄膜晶体管，所述控制薄膜晶体管的栅极接入所述控制信号，所述控制薄膜晶体管的源极接入公共电压，所述控制薄膜晶体管的漏极分别与所述液晶电容的下极板和所述存储电容的下极板连接。
在本发明的显示面板中，所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第一时刻早于第二时刻。
在本发明的显示面板中，所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第二时刻早于第一时刻。
本发明还提供一种显示装置，其包括上述显示面板。
 有益效果
本发明的像素驱动电路、显示面板及显示装置，通过在现有的像素驱动电路中增加稳压模块，能够在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定，从而避免显示面板重新开启时出现闪屏现象，提高了显示效果。
 附图说明
图1为现有像素驱动电路的结构示意图；
图2为本发明像素驱动电路的结构示意图；
图3为本发明像素驱动电的第一种结时序图；
图4为本发明像素驱动电的第二种结时序图。
 本发明的实施方式
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。
如图1所示，现有的像素驱动电路包括驱动薄膜晶体管T1、液晶电容C1、存储电容C2，所述驱动薄膜晶体管T1的栅极连接扫描线12，扫描线12输入有扫描信号，所述驱动薄膜晶体管T1的源极连接数据线11，数据线11输入有接入数据信号。
所述液晶电容C1的上极板和所述存储电容C2的上极板均与所述驱动薄膜晶体管T1的漏极连接，所述液晶电容C1的下极板和所述存储电容C2的下极板均接入公共电压COM。
请参照图2，图2为本发明像素驱动电路的结构示意图。
如图2所示，本发明的像素驱动电路包括驱动薄膜晶体管T1、液晶电容C1、存储电容C2以及稳压模块13，所述驱动薄膜晶体管T1的栅极连接扫描线12，扫描线12输入有扫描信号gate，所述驱动薄膜晶体管T1的源极连接数据线11，数据线11输入有接入数据信号Data。
所述液晶电容C1的上极板和所述存储电容C2的上极板均与所述驱动薄膜晶体管T1的漏极连接，所述液晶电容C1的下极板和所述存储电容C2的下极板均与稳压模块13连接，其中所述稳压模块13用于在所述显示面板断电时，使所述液晶电容C1的两极板之间的压差和所述存储电容C2的两极板之间的压差保持恒定。
其中，所述稳压模块13包括控制薄膜晶体管T2，所述稳压模块13用于在显示面板断电时，根据控制信号COMEN控制所述控制薄膜晶体管T2断开，以使所述液晶电容C1的两极板之间压差和所述存储电容C2的两极板之间压差保持恒定。
其中，所述稳压模块13还用于在显示面板工作期间，向所述液晶电容C1的下极板和所述存储电容C2的下极板提供公共电压COM。其中所述稳压模块13具体用于在显示面板工作时，根据所述控制信号COMEN控制所述控制薄膜晶体管T2闭合，以向所述液晶电容C1的下极板和所述存储电容C2的下极板提供公共电压。
其中，所述稳压模块13包括控制薄膜晶体管T2，所述控制薄膜晶体管T2的栅极接入所述控制信号COMEN，所述控制薄膜晶体管T2的源极接入公共电压COM，所述控制薄膜晶体管T2的漏极分别与所述液晶电容C1的下极板和所述存储电容C2的下极板连接。
如图3和4所示，所述控制信号COMEN的周期与所述扫描信号gate的周期同步。
如图3和4所示，在所述显示面板断电期间，所述扫描信号gate和所述控制信号COMEN均由高电平变为低电平。
在所述显示面板工作期间，所述扫描信号gate和所述控制信号COMEN均为高电平。
一实施方式中，如图3所示，所述公共电压COM在第一时刻（t1时刻）下降，所述控制信号COMEN在第二时刻（t2时刻）由高电平变为低电平，所述第一时刻早于第二时刻，也即t1早于t2。
另一实施方式中，如图4所示，所述公共电压COM在第一时刻（t3时刻）下降，所述控制信号COMEN在第二时刻（t2时刻）由高电平变为低电平，所述第一时刻晚于第二时刻，t2早于t3。也即，COM信号在gate/COMEN信号下降前就降至GND电位或者COM信号在gate/COMEN信号下降后才将至GND电位。
由于本发明在断电时，扫描信号下降，对液晶电容和存储电容的上极板产生影响，使电容上极板的电压出现偏移；此时控制信号也同步下降，从而对这两个电容的下极板产生影响，从而使得下极板的电压也出现相同的偏移，由于上下极板的电压同时偏移，因而使得两极板之间的压差保持恒定，从而避免出现闪屏现象。
本发明还提供一种显示面板，其包括上述任意一种像素驱动电路。
本发明还提供一种显示装置，其包括上述显示面板。
本发明的像素驱动电路、显示面板及显示装置，通过在现有的像素驱动电路中增加稳压模块，能够在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定，从而避免显示面板重新开启时出现闪屏现象，提高了显示效果。
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 (20)

  1. 一种像素驱动电路，其包括：
    驱动薄膜晶体管、液晶电容、存储电容以及稳压模块，所述驱动薄膜晶体管的栅极接入扫描信号，所述驱动薄膜晶体管的源极接入数据信号，所述液晶电容的上极板和所述存储电容的上极板均与所述驱动薄膜晶体管的漏极连接，所述液晶电容的下极板和所述存储电容的下极板均与稳压模块连接，其中所述稳压模块用于在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定。
  2. 根据权利要求1所述的像素驱动电路，其特征在于，
    所述稳压模块包括控制薄膜晶体管，所述稳压模块用于在显示面板断电时，根据控制信号控制所述控制薄膜晶体管断开，以使所述液晶电容的两极板之间压差和所述存储电容的两极板之间压差保持恒定。
  3. 根据权利要求2所述的像素驱动电路，其中
    所述控制信号的周期与所述扫描信号的周期同步。
  4. 根据权利要求3所述的像素驱动电路，其中
    在所述显示面板断电期间，所述扫描信号和所述控制信号均由高电平变为低电平。
  5. 根据权利要求2所述的像素驱动电路，其中
    所述稳压模块还用于在显示面板工作时，根据所述控制信号控制所述控制薄膜晶体管闭合，以向所述液晶电容的下极板和所述存储电容的下极板提供公共电压。
  6. 根据权利要求2所述的像素驱动电路，其中
    所述稳压模块包括控制薄膜晶体管，所述控制薄膜晶体管的栅极接入所述控制信号，所述控制薄膜晶体管的源极接入公共电压，所述控制薄膜晶体管的漏极分别与所述液晶电容的下极板和所述存储电容的下极板连接。
  7. 根据权利要求6所述的像素驱动电路，其中
    所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第一时刻早于第二时刻。
  8. 根据权利要求6所述的像素驱动电路，其中
    所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第二时刻早于第一时刻。
  9. 一种显示面板，其包括像素驱动电路，其包括：
    驱动薄膜晶体管、液晶电容、存储电容以及稳压模块，所述驱动薄膜晶体管的栅极接入扫描信号，所述驱动薄膜晶体管的源极接入数据信号，所述液晶电容的上极板和所述存储电容的上极板均与所述驱动薄膜晶体管的漏极连接，所述液晶电容的下极板和所述存储电容的下极板均与稳压模块连接，其中所述稳压模块用于在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定。
  10. 根据权利要求9所述的显示面板，其中
    所述稳压模块包括控制薄膜晶体管，所述稳压模块用于在显示面板断电时，根据控制信号控制所述控制薄膜晶体管断开，以使所述液晶电容的两极板之间压差和所述存储电容的两极板之间压差保持恒定。
  11. 根据权利要求10所述的显示面板，其中
    所述控制信号的周期与所述扫描信号的周期同步。
  12. 根据权利要求11所述的显示面板，其中
    在所述显示面板断电期间，所述扫描信号和所述控制信号均由高电平变为低电平。
  13. 根据权利要求10所述的显示面板，其中
    所述稳压模块还用于在显示面板工作时，根据所述控制信号控制所述控制薄膜晶体管闭合，以向所述液晶电容的下极板和所述存储电容的下极板提供公共电压。
  14. 根据权利要求10所述的显示面板，其中
    所述稳压模块包括控制薄膜晶体管，所述控制薄膜晶体管的栅极接入所述控制信号，所述控制薄膜晶体管的源极接入公共电压，所述控制薄膜晶体管的漏极分别与所述液晶电容的下极板和所述存储电容的下极板连接。
  15. 根据权利要求14所述的显示面板，其中
    所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第一时刻早于第二时刻。
  16. 根据权利要求14所述的显示面板，其中
    所述公共电压在第一时刻下降，所述控制信号在第二时刻由高电平变为低电平，所述第二时刻早于第一时刻。
  17. 一种显示装置，其包括显示面板，其包括像素驱动电路，其包括：
    驱动薄膜晶体管、液晶电容、存储电容以及稳压模块，所述驱动薄膜晶体管的栅极接入扫描信号，所述驱动薄膜晶体管的源极接入数据信号，所述液晶电容的上极板和所述存储电容的上极板均与所述驱动薄膜晶体管的漏极连接，所述液晶电容的下极板和所述存储电容的下极板均与稳压模块连接，其中所述稳压模块用于在显示面板断电时，使所述液晶电容的两极板之间的压差和所述存储电容的两极板之间的压差保持恒定。
  18. 根据权利要求17所述的显示装置，其中
    所述稳压模块包括控制薄膜晶体管，所述稳压模块用于在显示面板断电时，根据控制信号控制所述控制薄膜晶体管断开，以使所述液晶电容的两极板之间压差和所述存储电容的两极板之间压差保持恒定。
  19. 根据权利要求18所述的显示装置，其中
    所述控制信号的周期与所述扫描信号的周期同步。
  20. 根据权利要求19所述的显示装置，其中
    在所述显示面板断电期间，所述扫描信号和所述控制信号均由高电平变为低电平。
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CN104795035A (zh) * 2015-04-24 2015-07-22 昆山龙腾光电有限公司 公共电压产生电路、阵列基板以及液晶显示装置

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