WO2020019657A1 - 驱动电路及驱动方法 - Google Patents

驱动电路及驱动方法 Download PDF

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Publication number
WO2020019657A1
WO2020019657A1 PCT/CN2018/123180 CN2018123180W WO2020019657A1 WO 2020019657 A1 WO2020019657 A1 WO 2020019657A1 CN 2018123180 W CN2018123180 W CN 2018123180W WO 2020019657 A1 WO2020019657 A1 WO 2020019657A1
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Prior art keywords
switch
control signal
terminal
coupled
pixel electrode
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PCT/CN2018/123180
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English (en)
French (fr)
Inventor
黄笑宇
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惠科股份有限公司
重庆惠科金渝光电科技有限公司
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Priority to US17/262,757 priority Critical patent/US11367409B2/en
Publication of WO2020019657A1 publication Critical patent/WO2020019657A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • 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
    • G09G3/3614—Control of polarity reversal in general
    • 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
    • G09G3/3685—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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage

Definitions

  • the present application relates to the field of display, and in particular, to a driving circuit and a driving method.
  • Thin film transistor display (TFT-LCD, Thin Film, Liquid Crystal Display) is one of the main types of flat panel displays, and has become an important display platform in modern IT and video products.
  • the main driving principle of the thin film transistor display device is that the system motherboard connects the R / G / B compression signal, control signal and power to the connector on the printed circuit board (PCB) through wires, and the data passes through the printed circuit board.
  • the printed circuit board After processing the timing control chip (TCON, Timing Controller), the printed circuit board passes the source driver chip (S-COF, Source-Chip on Film) and the gate driver chip (G-COF, Gate-Chip). Film) is connected to the display area, so that the display device obtains the required power and signal.
  • the same voltage applied to the liquid crystal for a long time will cause the liquid crystal to appear polarized, resulting in abnormal display. Therefore, in the display of the TFT-LCD, there will be a reference voltage.
  • the range of voltage values above this reference voltage is defined as positive polarity, and the range of voltage values below this reference voltage is defined as negative polarity.
  • the voltage applied to the liquid crystal is switched from positive polarity to negative polarity every frame to avoid polarization of the liquid crystal. In practical applications, because the charging time is insufficient, the voltage on the pixel electrode is directly switched from positive polarity to negative polarity, and the cross-voltage is large.
  • the voltage on the pixel electrode cannot be switched to the target voltage within a limited charging time. Causes insufficient charging.
  • a charge sharing (Charge Sharing) technology is needed, that is, before the pixel electrode starts to charge, the charge on the pixel electrode is first neutralized to the vicinity of the reference voltage, and then the reference voltage is used to charge the target voltage.
  • this function is implemented by a built-in logic module in the S-COF.
  • An object of the present application is to provide a driving circuit, including but not limited to directly switching the voltage on a pixel electrode from a positive polarity to a negative polarity because of insufficient charging time, a large cross-voltage, and the pixel cannot be changed within a limited charging time.
  • the voltage on the electrode is switched to the target voltage, causing an issue of insufficient charging.
  • a driving circuit for a display panel includes: a first switch, a control terminal of the first switch is coupled to a first control signal, and the first terminal is coupled to the first Shared voltage; second switch, the control terminal of the second switch is coupled to the first control signal, the first terminal is coupled to the second shared voltage; third switch, the control terminal of the third switch is coupled to the second control signal A first terminal is coupled to the second terminal of the first switch and a second terminal of the second switch, and the second terminal is coupled to the pixel electrode; a data output module, the data output module is coupled to the pixel electrode; The on and off states of the first switch, the second switch, and the third switch are controlled by the output voltage of the first control signal and the second control signal; An on, off state of a switch, the second switch, and the third switch controls the output of the first shared voltage or the second shared voltage to the pixel electrode.
  • the first switch is a P-type field effect transistor
  • the second switch and the third switch are N-type field effect transistors.
  • the first shared voltage is a positive shared voltage
  • the second shared voltage is a negative shared voltage
  • the first shared voltage is a minimum voltage required to neutralize the negative voltage of the pixel electrode to a positive polarity display
  • the second shared voltage is a voltage required to neutralize the pixel electrode. The minimum voltage required to neutralize the positive polarity voltage to the negative polarity display.
  • the potential switching of the first control signal and the second control signal includes: during a first period, the first control The signal is a low potential, and the second control signal is a high potential. During the second period, the first control signal is a low potential, and the second control signal is a low potential.
  • the first switch and the third switch are turned on, the second switch is turned off, and the first shared voltage passes through the first switch and the first switch.
  • Three switches are output to the pixel electrode and neutralize the charge of the pixel electrode.
  • the third switch is turned off, and the data output module outputs display data to the pixel electrode.
  • the potential switching of the first control signal and the second control signal includes: during a first period, the first control The signal is a high potential, and the second control signal is a high potential. During the second period, the first control signal is a high potential, and the second control signal is a low potential.
  • the first switch is turned off, the second switch and the third switch are turned on, and the second shared voltage passes through the second switch and the first switch.
  • Three switches are output to the pixel electrode and neutralize the charge of the pixel electrode.
  • the third switch is turned off, and the data output module outputs display data to the pixel electrode.
  • Another object of the present application is to provide a display device including a first switch, a control terminal of the first switch coupled to a first control signal, a first terminal coupled to a first shared voltage, and a second switch, the The control terminal of the second switch is coupled to the first control signal, the first terminal is coupled to the second shared voltage; the third switch, the control terminal of the third switch is coupled to the second control signal, and the first terminal is coupled to the first control signal A second end of a switch and a second end of the second switch, the second end is coupled to the pixel electrode; a data output module, the data output module is coupled to the pixel electrode; wherein, the first control signal And the output voltage of the second control signal to control the on and off states of the first switch, the second switch, and the third switch; wherein, through the first switch, the second switch, and The on and off states of the third switch control the output of the first shared voltage or the second shared voltage to the pixel electrode.
  • Another object of the present application is to provide a driving method including: setting a first switch, a control terminal of the first switch is coupled to a first control signal, a first terminal is coupled to a first shared voltage, and a second Switch, the control terminal of the second switch is coupled to the first control signal, the first terminal is coupled to the second shared voltage; a third switch is provided, and the control terminal of the third switch is coupled to the second control signal, the first A terminal is coupled to the second terminal of the first switch and a second terminal of the second switch, and the second terminal is coupled to the pixel electrode; a data output module is provided, and the data output module is coupled to the pixel electrode; Controlling the on and off states of the first switch, the second switch, and the third switch by the output voltage of the first control signal and the second control signal; The on, off states of the switch, the second switch and the third switch control the output of the first shared voltage or the second shared voltage to the pixel electrode.
  • the driving method further includes:
  • the first shared voltage is a minimum voltage required to neutralize a negative polarity voltage of the pixel electrode to a positive polarity display
  • a second shared voltage is obtained, wherein the second shared voltage is a minimum voltage required to neutralize a positive polarity voltage of the pixel electrode to a negative polarity display.
  • the first switch is a P-type field effect transistor
  • the second switch and the third switch are N-type field effect transistors.
  • the first shared voltage is a positive shared voltage
  • the second shared voltage is a negative shared voltage
  • the steps of switching the potentials of the first control signal and the second control signal specifically include:
  • the first control signal is at a low potential and the second control signal is at a high potential
  • the first control signal is a low potential
  • the second control signal is a low potential
  • the first switch and the third switch are turned on, the second switch is turned off, and the first shared voltage passes through the first switch and the The third switch outputs to the pixel electrode and neutralizes the charge of the pixel electrode.
  • the third switch is turned off, and the data output module outputs display data to the pixel electrode.
  • the steps of switching the potentials of the first control signal and the second control signal specifically include:
  • the first control signal is at a high potential
  • the second control signal is at a high potential
  • the first control signal is at a high potential and the second control signal is at a low potential.
  • a positive polarity voltage or a negative polarity voltage can be selectively applied to the pixel electrodes to neutralize the different poles in the pixel electrodes Charge, and adjust the voltage of the pixel electrode to a reference voltage range to realize charge sharing and improve the display effect of the display panel.
  • FIG. 1 is a partial schematic diagram of an exemplary driving circuit
  • FIG. 2 is a schematic diagram of a driving circuit according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of an equivalent circuit during a first period provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an equivalent circuit during a first period provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a driving circuit according to another embodiment of the present application.
  • FIG. 6 is a schematic diagram of a display device according to an embodiment of the present application.
  • FIG. 7 is a flowchart of a driving method according to an embodiment of the present application.
  • FIG. 1 is a partial schematic diagram of an exemplary driving circuit. Please refer to FIG. 1.
  • An exemplary driving circuit 10 includes: a charging switch T10 and a liquid crystal capacitor CLC1, a charging switch T20, a liquid crystal capacitor CLC2, a discharging switch T30, and a storage capacitor. CS.
  • the scanning line G1 sends a scanning signal to turn on the charging switch T10 and the charging switch T20.
  • the display voltage (for example, positive polarity) of the data line D1 will charge the liquid crystal capacitor CLC1 and the liquid crystal capacitor CLC2;
  • the discharge switch T30 will be turned on.
  • the charge of the liquid crystal capacitor CLC2 will be shared with the storage capacitor CS to balance the voltage between the two.
  • the scanning line G1 sends a scanning signal to turn on the charging switch T10 and the charging switch T20 again.
  • the display voltage (for example, negative polarity) of the data line D1 causes the liquid crystal capacitor CLC1 and the liquid crystal capacitor CLC2 to discharge.
  • the liquid crystal capacitor CLC1 and the liquid crystal capacitor CLC2 will have the same negative polarity voltage as the data line D1.
  • the discharge switch T30 will be turned on, and the storage capacitor CS is on the first screen at this time.
  • the positive charge stored in time neutralizes the negative charge having the liquid crystal capacitor CLC2. Therefore, the liquid crystal capacitor CLC1 and the liquid crystal capacitor CLC2 have different voltages.
  • FIG. 2 is a schematic diagram of a driving circuit according to an embodiment of the present application
  • FIG. 3 to FIG. 4 are schematic diagrams of equivalent circuits during a first period of an embodiment of the present application. Please refer to FIG. 2, FIG. 3 and FIG. 4 at the same time.
  • a driving circuit 20 includes a first switch M1, and a control terminal 101a of the first switch M1 is coupled to a first control signal.
  • the first terminal 101b is coupled to the first shared voltage C1; the second switch M2, the control terminal 102a of the second switch M2 is coupled to the first control signal A, and the first terminal 102b is coupled to the second shared voltage C2; Three switches M3, the control terminal 103a of the third switch M3 is coupled to the second control signal B, and the first terminal 103a is coupled to the second terminal 101c of the first switch M1 and the second terminal of the second switch M2 102c, the second terminal 103c is coupled to the pixel electrode; a data output module, the data output module is coupled to the pixel electrode; wherein, the output voltage of the first control signal A and the second control signal B is used to control
  • the first switch M1, the second switch M2, and the third switch M3 are in an on state and an off state.
  • the first shared voltage C1 or the second shared voltage is controlled by the on state and the off state of the first switch M1, the second switch M2, and the third switch M3.
  • the shared voltage C2 is output to the pixel electrode.
  • the first switch M1 is a P-type field effect transistor
  • the second switch M2 and the third switch M3 are N-type field effect transistors.
  • the first shared voltage C1 is a positive shared voltage
  • the second shared voltage C2 is a negative shared voltage
  • the potential switching of the first control signal A and the second control signal B includes: during a first period, the A control signal A is a low potential L, and the second control signal B is a high potential H. During the second period, the first control signal A remains at the original potential, that is, a low potential L, and the second control The signal switches to a low potential L.
  • the first switch M1 and the third switch M3 are turned on, and the second switch M2 is turned off, and an equivalent circuit thereof is shown as a circuit 21 in FIG. 3.
  • the first shared voltage C1 is output to the pixel electrode through the first switch M1 and the third switch M3, and neutralizes the negative charge of the pixel electrode to make the voltage of the pixel electrode. Adjust to the reference voltage range.
  • the third switch M3 is turned off, and the data output module outputs display data to the pixel electrode.
  • the potential switching of the first control signal A and the second control signal B includes: during a first period, the first A control signal A is a high potential H, and the second control signal B is a high potential H. During the second period, the first control signal A remains at the original potential, that is, a high potential H, and the second The control signal B is a low potential L.
  • the first switch M1 is turned off, the second switch M2 and the third switch M3 are turned on, and an equivalent circuit thereof is shown as a circuit 22 in FIG. 4.
  • the second shared voltage C2 is output to the pixel electrode through the second switch M2 and the third switch M3, and neutralizes the positive charge of the pixel electrode to make the voltage of the pixel electrode Adjust to the reference voltage range.
  • the third switch M3 is turned off, and the data output module outputs display data to the pixel electrode.
  • FIG. 5 is a schematic diagram of a driving circuit according to another embodiment of the present application.
  • a driving circuit 30 is compared with the driving circuit 20.
  • the first switch M1 and the third switch M3 are N-type field effect transistors, and the second switch M2 is a P-type field effect transistor.
  • FIG. 6 is a schematic diagram of a display panel according to an embodiment of the present application.
  • a display device 1 includes: a control part 110; a display panel 100, the display panel 100 having a display area 118 and a non-display area 116; a plurality of source driving chips 112 and The plurality of gate driving chips 114 are opposite to the non-display area 116 of the display panel 100.
  • the driving circuit (20, 30) as described in the embodiments may be provided in the non-display area 116 of the display panel or the fan-out area 117 of the display panel, for example.
  • FIG. 7 is a flowchart of a driving method according to an embodiment of the present application.
  • the driving method is: S201: A first switch M1 is provided, and a control terminal 101 a of the first switch M1 is coupled to a first control signal A and a first terminal. 101b is coupled to the first shared voltage C1; S202: A second switch M2 is provided, the control terminal 102a of the second switch M2 is coupled to the first control signal A, and the first terminal 102b is coupled to the second shared voltage C2; S203: A third switch M3 is provided. The control terminal 103a of the third switch M3 is coupled to the second control signal B.
  • the first terminal 103a is coupled to the second terminal 101c of the first switch M1 and the second switch M2.
  • the second end 102c and the second end 103c are coupled to the pixel electrode;
  • the second common voltage C2 is output to the pixel electrode.
  • the driving method further includes:
  • a second shared voltage C2 is obtained, and the second shared voltage C2 is a minimum voltage required to neutralize a positive polarity voltage of the pixel electrode to a negative polarity display.
  • the first switch M1 is a P-type field effect transistor
  • the second switch M2 and the third switch M3 are N-type field effect transistors.
  • the first shared voltage C1 is a positive shared voltage
  • the second shared voltage C2 is a negative shared voltage
  • the steps of switching the potentials of the first control signal A and the second control signal B specifically include:
  • the first control signal A is at a low potential and the second control signal B is at a high potential;
  • the first control signal A is at a low potential
  • the second control signal B is at a low potential
  • the first switch M1 and the third switch M3 are turned on, the second switch M2 is turned off, and the first shared voltage C1 passes through the first switch M1 and the third switch M3 are output to the pixel electrode and neutralize the charge of the pixel electrode.
  • the third switch M3 is turned off, and the data output module outputs display data to the pixel electrode.
  • the steps of switching the potentials of the first control signal A and the second control signal B specifically include:
  • the first control signal A is at a high potential
  • the second control signal B is at a high potential
  • the first control signal A is at a high potential
  • the second control signal B is at a low potential
  • the present application controls the opening and closing of multiple active switches by switching the high and low potentials of the first control signal A and the second control signal B, and can selectively select Applying a positive polarity voltage or a negative polarity voltage to neutralize the heteropolar charges in the pixel electrode and adjust the voltage of the pixel electrode to a reference voltage range, thereby achieving charge sharing and improving the display effect of the display panel.

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

Abstract

公开了一种驱动装置、显示装置及驱动方法。该驱动装置包括：第一开关（M1）、第二开关（M2）、第三开关（M3）和数据输出模块，通过第一开关（M1）、第二开关（M2）和第三开关（M3）的开启及关闭状态，控制第一共享电压（C1）或第二共享电压（C2）输出至像素电极。

Description

驱动电路及驱动方法
本申请要求于2018年7月26日提交中国专利局，申请号为201810836142X，发明名称为“驱动电路及驱动方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请关于显示领域，特别是涉及一种驱动电路及驱动方法。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然构成现有技术。薄膜晶体管显示装置(TFT-LCD，Thin Film Transistor Liquid Crystal Display)是当前平板显示的主要品种之一，已经成为了现代IT、视讯产品中重要的显示平台。薄膜晶体管显示装置主要驱动原理是，***主板将R/G/B压缩信号、控制信号及动力通过线材与印制电路板(PCB)上的连接器(Connector)相连接，数据经过印制电路板上的时序控制芯片(TCON，Timing Controller)处理后，经印制电路板，通过源极驱动芯片(S-COF，Source-Chip on Film)和栅极驱动芯片(G-COF，Gate-Chip on Film)与显示区连接，从而使得显示装置获得所需的电源、信号。
因为TFT-LCD中液晶的材料特性，长时间施加于液晶相同的电压，会使得液晶出现极化现象，导致显示异常。因此在TFT-LCD的显示中，会有一个基准电压，高于此基准电压的电压值范围定义为正极性，低于此基准电压的电压值范围定义为负极性。在显示过程中，作用于液晶上的电压每一帧会从正极性与负极性之间切换，以避免液晶极化。而实际的应用中，因为充电时间不足， 直接将像素电极上的电压从正极性切换为负极性，跨压较大，在有限的充电时间内无法将像素电极上的电压切换至目标电压，会造成充电不足。此时即需要电荷分享(Charge Sharing)技术，即像素电极开始充电前，先将像素电极上的电荷中和至基准电压附近，再由基准电压开始向目标电压进行充电。现有技术中，是通过S-COF中的内置逻辑模块实现此功能。
申请内容
本申请的一个目的在于提供一种驱动电路，包括但不限于因为充电时间不足，直接将像素电极上的电压从正极性切换为负极性，跨压较大，在有限的充电时间内无法将像素电极上的电压切换至目标电压，造成充电不足的问题。
本申请实施例采用的技术方案是：一种显示面板的驱动电路，所述驱动电路包括：第一开关，所述第一开关的控制端耦接第一控制信号，第一端耦接第一共享电压；第二开关，所述第二开关的控制端耦接第一控制信号，第一端耦接第二共享电压；第三开关，所述第三开关的控制端耦接第二控制信号，第一端耦接所述第一开关的第二端和所述第二开关的第二端，第二端耦接像素电极；数据输出模块，所述数据输出模块耦接所述像素电极；其中，通过所述第一控制信号和所述第二控制信号的输出电压，控制所述第一开关、所述第二开关和所述第三开关的开启及关闭状态；其中，通过所述第一开关、所述第二开关和所述第三开关的开启及关闭状态，控制所述第一共享电压或所述第二共享电压输出至所述像素电极。
在本申请的一实施例中，所述第一开关为P型场效应晶体管，所述第二开关和所述第三开关为N型场效应晶体管。
在本申请的一实施例中，所述第一共享电压为正极性共享电压，所述第二共享电压为负极性共享电压。
在本申请的一实施例中，所述第一共享电压为将所述像素电极的负极性电压中和至正极性显示所需的最低电压，所述第二共享电压为将所述像素电极的正极性电压中和至负极性显示所需的最低电压。
在本申请的一实施例中，当显示画面由负极性信号切换至正极性信号，所述第一控制信号和所述第二控制信号的电位切换包括：在第一期间，所述第一控制信号为低电位，所述第二控制信号为高电位；在第二期间，所述第一控制信号为低电位，所述第二控制信号为低电位。
在本申请的一实施例中，在第一期间，所述第一开关和所述第三开关开启，所述第二开关关闭，所述第一共享电压通过所述第一开关和所述第三开关输出至所述像素电极，并中和所述像素电极的电荷。
在本申请的一实施例中，在第二期间，所述第三开关关闭，所述数据输出模块输出显示数据至所述像素电极。
在本申请的一实施例中，当显示画面由正极性信号切换至负极性信号，所述第一控制信号和所述第二控制信号的电位切换包括：在第一期间，所述第一控制信号为高电位，所述第二控制信号为高电位；在第二期间，所述第一控制信号为高电位，所述第二控制信号为低电位。
在本申请的一实施例中，在第一期间，所述第一开关关闭，所述第二开关和所述第三开关开启，所述第二共享电压通过所述第二开关和所述第三开关输出至所述像素电极，并中和所述像素电极的电荷。
在本申请的一实施例中，在第二期间，所述第三开关关闭，所述数据输出模块输出显示数据至所述像素电极。
本申请的另一目的在于提供一种显示装置，包括：第一开关，所述第一开关的控制端耦接第一控制信号，第一端耦接第一共享电压；第二开关，所述第 二开关的控制端耦接第一控制信号，第一端耦接第二共享电压；第三开关，所述第三开关的控制端耦接第二控制信号，第一端耦接所述第一开关的第二端和所述第二开关的第二端，第二端耦接像素电极；数据输出模块，所述数据输出模块耦接所述像素电极；其中，通过所述第一控制信号和所述第二控制信号的输出电压，控制所述第一开关、所述第二开关和所述第三开关的开启及关闭状态；其中，通过所述第一开关、所述第二开关和所述第三开关的开启及关闭状态，控制所述第一共享电压或所述第二共享电压输出至所述像素电极。
本申请的再一目的在于提供一种驱动方法，包括：设置一第一开关，所述第一开关的控制端耦接第一控制信号，第一端耦接第一共享电压；设置一第二开关，所述第二开关的控制端耦接第一控制信号，第一端耦接第二共享电压；设置一第三开关，所述第三开关的控制端耦接第二控制信号，第一端耦接所述第一开关的第二端和所述第二开关的第二端，第二端耦接像素电极；设置一数据输出模块，所述数据输出模块耦接所述像素电极；其中，通过所述第一控制信号和所述第二控制信号的输出电压，控制所述第一开关、所述第二开关和所述第三开关的开启及关闭状态；其中，通过所述第一开关、所述第二开关和所述第三开关的开启及关闭状态，控制所述第一共享电压或所述第二共享电压输出至所述像素电极。
在本申请的一实施例中，其中，驱动方法还包括：
获取第一共享电压，其中，所述第一共享电压为将所述像素电极的负极性电压中和至正极性显示所需的最低电压；
获取第二共享电压，其中，所述第二共享电压为将所述像素电极的正极性电压中和至负极性显示所需的最低电压。
在本申请的一实施例中，其中，所述第一开关为P型场效应晶体管，所述 第二开关和所述第三开关为N型场效应晶体管。
在本申请的一实施例中，其中，所述第一共享电压为正极性共享电压，所述第二共享电压为负极性共享电压。
在本申请的一实施例中，其中，当显示画面由负极性信号切换至正极性信号，所述第一控制信号和所述第二控制信号的电位切换的步骤具体包括：
在第一期间，所述第一控制信号为低电位，所述第二控制信号为高电位；
在第二期间，所述第一控制信号为低电位，所述第二控制信号为低电位。
在本申请的一实施例中，其中，在第一期间，所述第一开关和所述第三开关开启，所述第二开关关闭，所述第一共享电压通过所述第一开关和所述第三开关输出至所述像素电极，并中和所述像素电极的电荷。
在本申请的一实施例中，其中，在第二期间，所述第三开关关闭，所述数据输出模块输出显示数据至所述像素电极。
在本申请的一实施例中，其中，当显示画面由正极性信号切换至负极性信号，所述第一控制信号和所述第二控制信号的电位切换的步骤具体包括：
在第一期间，所述第一控制信号为高电位，所述第二控制信号为高电位；
在第二期间，所述第一控制信号为高电位，所述第二控制信号为低电位。
本申请实施例通过增加多个主动开关，以高低电位的切换来控制多个主动开关开启及关闭，可以选择性地向像素电极施加正极性电压或负极性电压，中和像素电极中的异极性电荷，并将像素电极的电压调整至基准电压范围，以此实现电荷共享，提高显示面板的显示效果。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例或示范性技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图 仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为范例性的驱动电路的局部示意图；
图2为本申请一实施例提供的驱动电路示意图；
图3为本申请一实施例提供的第一期间的等效电路示意图；
图4为本申请一实施例提供的第一期间的等效电路示意图；
图5为本申请又一实施例提供的驱动电路示意图；
图6为本申请一实施例提供的显示装置示意图；
图7为本申请一实施例提供的驱动方法流程图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
需说明的是，当部件被称为“固定于”或“设置于”另一个部件，它可以直接在另一个部件上或者间接在该另一个部件上。当一个部件被称为是“连接于”另一个部件，它可以是直接或者间接连接至该另一个部件上。术语“上”、“下”、“左”、“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。术语“第一”、“第二”仅用于便于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明技术特征的数量。“多个”的含义是两个或两个以上，除非另有明确具体的限定。
为更进一步阐述本申请为达成预定申请目的所采取的技术手段及功效，以下结合附图及具体的实施例，对依据本申请提出的一种驱动电路，其具体实施方式、结构、特征及其功效，详细说明如后。
图1为范例性的驱动电路的局部示意图，请参考图1，一种范例性的驱动电路10，包括：充电开关T10及液晶电容CLC1，充电开关T20、液晶电容CLC2、放电开关T30及储存电容CS。其中，在第一帧画面期间，扫描线G1送出一扫描信号开启充电开关T10及充电开关T20，此时数据线D1的显示电压(例如正极性)将使液晶电容CLC1及液晶电容CLC2充电；接着，下一条扫描线G2送出另一扫描信号时，将开启放电开关T30，此时液晶电容CLC2的电荷将分享给储存电容CS，使两者的电压平衡。在第二帧画面期间，扫描线G1再送出一扫描信号以再一次开启充电开关T10及充电开关T20，此时数据线D1的显示电压(例如负极性)使液晶电容CLC1及液晶电容CLC2放电，液晶电容CLC1及液晶电容CLC2将达到与数据线D1有相同的负极性电压；接着，下一条扫描线G2再送出另一扫描信号时，将开启放电开关T30，此时储存电容CS于第一画面时间储存的正极性电荷中和具有液晶电容CLC2的负极性电荷，因此，液晶电容CLC1及液晶电容CLC2具有不同的电压。
图2为本申请一实施例的驱动电路示意图，图3至图4为本申请一实施例的第一期间的等效电路示意图。请同时参考图2，图3和图4，在本申请的一实施例中，一种驱动电路20，包括：第一开关M1，所述第一开关M1的控制端101a耦接第一控制信号A，第一端101b耦接第一共享电压C1；第二开关M2，所述第二开关M2的控制端102a耦接第一控制信号A，第一端102b耦接第二共享电压C2；第三开关M3，所述第三开关M3的控制端103a耦接第二控制信号B，第一端103a耦接所述第一开关M1的第二端101c和所述第二 开关M2的第二端102c，第二端103c耦接像素电极；数据输出模块，所述数据输出模块耦接所述像素电极；其中，通过所述第一控制信号A和所述第二控制信号B的输出电压，控制所述第一开关M1、所述第二开关M2和所述第三开关M3的开启状态及关闭状态。
在本申请的一实施例中，通过所述第一开关M1、所述第二开关M2和所述第三开关M3的开启状态及关闭状态，控制所述第一共享电压C1或所述第二共享电压C2输出至所述像素电极。
在本申请的一实施例中，所述第一开关M1为P型场效应晶体管，所述第二开关M2和所述第三开关M3为N型场效应晶体管。
在本申请的一实施例中，所述第一共享电压C1为正极性共享电压，所述第二共享电压C2为负极性共享电压。
在本申请的一实施例中，当显示画面由负极性信号切换至正极性信号，所述第一控制信号A和所述第二控制信号B的电位切换包括：在第一期间，所述第一控制信号A为低电位L，所述第二控制信号B为高电位H；在第二期间，所述第一控制信号A保持原电位不变，即为低电位L，所述第二控制信号切换至低电位L。
在本申请的一实施例中，在第一期间，所述第一开关M1和所述第三开关M3开启，所述第二开关M2关闭，其等效电路如图3的电路21所示。其中，所述第一共享电压C1通过所述第一开关M1和所述第三开关M3输出至所述像素电极，并中和所述像素电极的负极性电荷，以使所述像素电极的电压调整至基准电压范围。
在本申请的一实施例中，在第二期间，所述第三开关M3关闭，所述数据输出模块输出显示数据至所述像素电极。
在本申请的一实施例中，当显示画面由正极性信号切换至负极性信号，所述第一控制信号A和所述第二控制信号B的电位切换包括：在第一期间，所述第一控制信号A为高电位H，所述第二控制信号B为高电位H；在第二期间，所述第一控制信号A保持原电位不变，即为为高电位H，所述第二控制信号B为低电位L。
在本申请的一实施例中，在第一期间，所述第一开关M1关闭，所述第二开关M2和所述第三开关M3开启，其等效电路如图4的电路22所示。其中，所述第二共享电压C2通过所述第二开关M2和所述第三开关M3输出至所述像素电极，并中和所述像素电极的正极性电荷，以使所述像素电极的电压调整至基准电压范围。
在本申请的一实施例中，在第二期间，所述第三开关M3关闭，所述数据输出模块输出显示数据至所述像素电极。
图5为本申请又一实施例的驱动电路示意图。在本申请的一实施例中，一种驱动电路30，其与驱动电路20相比，第一开关M1和第三开关M3为N型场效应晶体管，第二开关M2为P型场效应晶体管。通过第一控制信号A和第二控制信号B的高低电位切换，亦可以等效地达到消除像素电极的异极性电荷的效果。
图6为本申请一实施例的显示面板示意图。在本申请的一实施例中，一种显示装置1，包括：控制部件110；显示面板100，所述显示面板100具有一显示区118和一非显示区116；多个源极驱动芯片112和多个栅极驱动芯片114，相对设置于显示面板100的非显示区116。其中，如各实施例中所述的驱动电路(20，30)可例如设置于显示面板的非显示区116，亦或设置于显示面板的扇出区117。
图7为本申请一实施例的驱动方法流程图。参考图7以及图2，在本申请的一实施例中，驱动方法为：S201：设置一第一开关M1，所述第一开关M1的控制端101a耦接第一控制信号A，第一端101b耦接第一共享电压C1；S202：设置一第二开关M2，所述第二开关M2的控制端102a耦接第一控制信号A，第一端102b耦接第二共享电压C2；S203：设置一第三开关M3，所述第三开关M3的控制端103a耦接第二控制信号B，第一端103a耦接所述第一开关M1的第二端101c和所述第二开关M2的第二端102c，第二端103c耦接像素电极；S204：设置一数据输出模块，所述数据输出模块耦接所述像素电极；其中，通过所述第一控制信号A和所述第二控制信号B的输出电压，控制所述第一开关M1、所述第二开关M2和所述第三开关M3的开启状态及关闭状态；其中，通过所述第一开关M1、所述第二开关M2和所述第三开关M3的开启及关闭状态，控制所述第一共享电压C1或所述第二共享电压C2输出至所述像素电极。
在本申请的一实施例中，驱动方法还包括：
获取第一共享电压C1，所述第一共享电压C1为将所述像素电极的负极性电压中和至正极性显示所需的最低电压；
获取第二共享电压C2，所述第二共享电压C2为将所述像素电极的正极性电压中和至负极性显示所需的最低电压。
在本申请的一实施例中，所述第一开关M1为P型场效应晶体管，所述第二开关M2和所述第三开关M3为N型场效应晶体管。
在本申请的一实施例中，所述第一共享电压C1为正极性共享电压，所述第二共享电压C2为负极性共享电压。
在本申请的一实施例中，当显示画面由负极性信号切换至正极性信号，所 述第一控制信号A和所述第二控制信号B的电位切换的步骤具体包括：
在第一期间，所述第一控制信号A为低电位，所述第二控制信号B为高电位；
在第二期间，所述第一控制信号A为低电位，所述第二控制信号B为低电位。
在本申请的一实施例中，在第一期间，所述第一开关M1和所述第三开关M3开启，所述第二开关M2关闭，所述第一共享电压C1通过所述第一开关M1和所述第三开关M3输出至所述像素电极，并中和所述像素电极的电荷。
在本申请的一实施例中，在第二期间，所述第三开关M3关闭，所述数据输出模块输出显示数据至所述像素电极。
在本申请的一实施例中，当显示画面由正极性信号切换至负极性信号，所述第一控制信号A和所述第二控制信号B的电位切换的步骤具体包括：
在第一期间，所述第一控制信号A为高电位，所述第二控制信号B为高电位；
在第二期间，所述第一控制信号A为高电位，所述第二控制信号B为低电位。
本申请通过增加多个主动开关(M1，M2，M3)，以第一控制信号A和第二控制信号B的高低电位的切换来控制多个主动开关开启及关闭，可以选择性地向像素电极施加正极性电压或负极性电压，中和像素电极中的异极性电荷，并将像素电极的电压调整至基准电压范围，以此实现电荷共享，提高显示面板的显示效果。
“在一些实施例中”及“在各种实施例中”等用语被重复地使用。所述用语通常不是指相同的实施例；但它也可以是指相同的实施例。“包含”、“具有” 及“包括”等用词是同义词，除非其前后文意显示出其它意思。
以上所述，仅是本申请的实施例，并非对本申请作任何形式上的限制，虽然本申请已以具体的实施例揭露如上，然而并非用以限定本申请，任何熟悉本专业的技术人员，在不脱离本申请技术方案范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本申请技术方案的内容，依据本申请的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本申请技术方案的范围内。

Claims (19)

  1. 一种显示面板的驱动电路，所述驱动电路包括：
    第一开关，所述第一开关的控制端耦接第一控制信号，第一端耦接第一共享电压；
    第二开关，所述第二开关的控制端耦接第一控制信号，第一端耦接第二共享电压；
    第三开关，所述第三开关的控制端耦接第二控制信号，第一端耦接所述第一开关的第二端和所述第二开关的第二端，第二端耦接像素电极；
    数据输出模块，所述数据输出模块耦接所述像素电极；
    其中，通过所述第一控制信号和所述第二控制信号的输出电压，控制所述第一开关、所述第二开关和所述第三开关的开启及关闭状态；
    其中，通过所述第一开关、所述第二开关和所述第三开关的开启及关闭状态，控制所述第一共享电压或所述第二共享电压输出至所述像素电极。
  2. 如权利要求1所述的驱动电路，其中，所述第一开关为P型场效应晶体管，所述第二开关和所述第三开关为N型场效应晶体管。
  3. 如权利要求1所述的驱动电路，其中，所述第一共享电压为正极性共享电压，所述第二共享电压为负极性共享电压。
  4. 如权利要求1所述的驱动电路，其中，所述第一共享电压为将所述像素电极的负极性电压中和至正极性显示所需的最低电压，所述第二共享电压为将所述像素电极的正极性电压中和至负极性显示所需的最低电压。
  5. 如权利要求1所述的驱动电路，其中，当显示画面由负极性信号切换至正极性信号，所述第一控制信号和所述第二控制信号的电位切换包括：
    在第一期间，所述第一控制信号为低电位，所述第二控制信号为高电位；
    在第二期间，所述第一控制信号为低电位，所述第二控制信号为低电位。
  6. 如权利要求5所述的驱动电路，其中，在第一期间，所述第一开关和所述第三开关开启，所述第二开关关闭，所述第一共享电压通过所述第一开关和所述第三开关输出至所述像素电极，并中和所述像素电极的电荷。
  7. 如权利要求5所述的驱动电路，其中，在第二期间，所述第三开关关闭，所述数据输出模块输出显示数据至所述像素电极。
  8. 如权利要求1所述的驱动电路，其中，当显示画面由正极性信号切换至负极性信号，所述第一控制信号和所述第二控制信号的电位切换包括：
    在第一期间，所述第一控制信号为高电位，所述第二控制信号为高电位；
    在第二期间，所述第一控制信号为高电位，所述第二控制信号为低电位。
  9. 如权利要求8所述的驱动电路，其中，在第一期间，所述第二开关和所述第三开关开启，所述第一开关关闭，所述第二共享电压通过所述第二开关和所述第三开关输出至所述像素电极，并中和所述像素电极的电荷。
  10. 如权利要求8所述的驱动电路，其中，在第二期间，所述第三开关关闭，所述数据输出模块输出显示数据至所述像素电极。
  11. 一种显示装置，其中，包括：
    第一开关，所述第一开关的控制端耦接第一控制信号，第一端耦接第一共享电压；
    第二开关，所述第二开关的控制端耦接第一控制信号，第一端耦接第二共享电压；
    第三开关，所述第三开关的控制端耦接第二控制信号，第一端耦接所述第一开关的第二端和所述第二开关的第二端，第二端耦接像素电极；
    数据输出模块，所述数据输出模块耦接所述像素电极；
    其中，通过所述第一控制信号和所述第二控制信号的输出电压，控制所述第一开关、所述第二开关和所述第三开关的开启及关闭状态；
    其中，通过所述第一开关、所述第二开关和所述第三开关的开启及关闭状态，控制所述第一共享电压或所述第二共享电压输出至所述像素电极。
  12. 一种驱动方法，包括：
    设置一第一开关，所述第一开关的控制端耦接第一控制信号，第一端耦接第一共享电压；
    设置一第二开关，所述第二开关的控制端耦接第一控制信号，第一端耦接第二共享电压；
    设置一第三开关，所述第三开关的控制端耦接第二控制信号，第一端耦接所述第一开关的第二端和所述第二开关的第二端，第二端耦接像素电极；
    设置一数据输出模块，所述数据输出模块耦接所述像素电极；
    其中，通过所述第一控制信号和所述第二控制信号的输出电压，控制所述第一开关、所述第二开关和所述第三开关的开启及关闭状态；
    其中，通过所述第一开关、所述第二开关和所述第三开关的开启及关闭状态，控制所述第一共享电压或所述第二共享电压输出至所述像素电极。
  13. 如权利要求12所述的驱动方法，其中，驱动方法还包括：
    获取第一共享电压，其中，所述第一共享电压为将所述像素电极的负极性电压中和至正极性显示所需的最低电压；
    获取第二共享电压，其中，所述第二共享电压为将所述像素电极的正极性电压中和至负极性显示所需的最低电压。
  14. 如权利要求12所述的驱动方法，其中，所述第一开关为P型场效应 晶体管，所述第二开关和所述第三开关为N型场效应晶体管。
  15. 如权利要求12所述的驱动方法，其中，所述第一共享电压为正极性共享电压，所述第二共享电压为负极性共享电压。
  16. 如权利要求12所述的驱动方法，其中，当显示画面由负极性信号切换至正极性信号，所述第一控制信号和所述第二控制信号的电位切换的步骤具体包括：
    在第一期间，所述第一控制信号为低电位，所述第二控制信号为高电位；
    在第二期间，所述第一控制信号为低电位，所述第二控制信号为低电位。
  17. 如权利要求16所述的驱动方法，其中，在第一期间，所述第一开关和所述第三开关开启，所述第二开关关闭，所述第一共享电压通过所述第一开关和所述第三开关输出至所述像素电极，并中和所述像素电极的电荷。
  18. 如权利要求16所述的驱动方法，其中，在第二期间，所述第三开关关闭，所述数据输出模块输出显示数据至所述像素电极。
  19. 如权利要求12所述的驱动方法，其中，当显示画面由正极性信号切换至负极性信号，所述第一控制信号和所述第二控制信号的电位切换的步骤具体包括：
    在第一期间，所述第一控制信号为高电位，所述第二控制信号为高电位；
    在第二期间，所述第一控制信号为高电位，所述第二控制信号为低电位。
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