WO2020199302A1 - 显示面板驱动电路及方法 - Google Patents

显示面板驱动电路及方法 Download PDF

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Publication number
WO2020199302A1
WO2020199302A1 PCT/CN2019/085795 CN2019085795W WO2020199302A1 WO 2020199302 A1 WO2020199302 A1 WO 2020199302A1 CN 2019085795 W CN2019085795 W CN 2019085795W WO 2020199302 A1 WO2020199302 A1 WO 2020199302A1
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WIPO (PCT)
Prior art keywords
display panel
voltage
circuit
low
common electrode
Prior art date
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PCT/CN2019/085795
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English (en)
French (fr)
Inventor
吴苗发
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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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Publication of WO2020199302A1 publication Critical patent/WO2020199302A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/027—Arrangements or methods related to powering off a display

Definitions

  • This application relates to the display field, and in particular to a display panel driving circuit and method.
  • the driving circuit discharges slowly when shutting down, and the display device needs a long time to discharge, which causes the afterimage to completely disappear after shutting down.
  • the existing display device has a technical problem of image retention after shutdown.
  • the present application provides a display panel driving circuit and method, so as to alleviate the technical problem of shutdown image retention in the existing display device.
  • the present application provides a display panel drive circuit, which includes a drive circuit, a low potential circuit, and a control circuit.
  • the drive circuit is used to provide a common electrode voltage to the display panel; the low potential circuit is used to provide a low voltage to the display panel. Potential voltage.
  • the control circuit is used to detect whether the display panel needs to be turned off, and when necessary, to control the operation of the low-potential circuit to convert the common electrode voltage of the display panel into the low-potential voltage.
  • control circuit is electrically connected to the voltage terminal of the driving circuit, and is used to determine whether the display panel needs to be turned off according to the voltage value of the voltage terminal.
  • the control circuit determines that the display panel needs to be turned off.
  • control circuit is electrically connected to the output terminal of the driving circuit, and is used to determine whether the display panel needs to be shut down according to the change trend of the common electrode voltage.
  • the control circuit determines that the display panel needs to be closed.
  • the signal output terminal of the low potential circuit is electrically connected to the signal input terminal of the interface connector, and is used to directly reduce the common electrode voltage input to the interface connector to the low Potential voltage.
  • the signal output terminal of the low-potential circuit is electrically connected to the common electrode voltage output terminal of the interface connector, and the common electrode voltage output terminal of the interface connector is electrically connected to the display panel, It is used to directly reduce the common electrode voltage output by the interface connector to the low potential voltage.
  • the low-potential circuit includes a switch tube, the signal input terminal of the switch tube is connected to a low-potential voltage, and the signal control terminal of the switch tube is electrically connected to the control circuit, so The signal output terminal of the switch tube outputs the low potential voltage when the switch tube is turned on.
  • the switch tube is an NMOS tube
  • the gate of the NMOS tube is connected to the control circuit
  • the source of the NMOS tube is connected to a low potential voltage
  • the drain of the NMOS tube is The electrode is electrically connected to the common electrode voltage input terminal of the display panel.
  • the switch tube is a PMOS tube
  • the gate of the PMOS tube is connected to the control circuit
  • the drain of the PMOS tube is connected to a low potential voltage
  • the source of the PMOS tube is The electrode is electrically connected to the common electrode voltage input terminal of the display panel.
  • the present application provides a method for driving a display panel, which includes:
  • the driving circuit provides the common electrode voltage to the display panel
  • the low-potential circuit provides a low-potential voltage to the display panel
  • the control circuit detects whether the display panel needs to be turned off, and when necessary, controls the operation of the low potential circuit to convert the common electrode voltage of the display panel into the low potential voltage.
  • the control circuit is electrically connected to the voltage terminal of the driving circuit, and the step of the control circuit detecting whether the display panel needs to be turned off includes: the control circuit according to the voltage value of the voltage terminal Determine whether the display panel needs to be closed.
  • the step of the control circuit determining whether the display panel needs to be turned off according to the voltage value of the voltage terminal includes: when the voltage value changes from a high potential to a low potential, the step The control circuit determines that the display panel needs to be closed.
  • the control circuit is electrically connected to the output terminal of the driving circuit, and the step of the control circuit detecting whether the display panel needs to be closed includes: the control circuit according to the change trend of the common electrode voltage Determine whether the display panel needs to be closed.
  • the step of the control circuit judging whether the display panel needs to be turned off according to the change trend of the common electrode voltage includes, when the change trend gradually becomes smaller, the control circuit determines The display panel needs to be closed.
  • the signal output terminal of the low-potential circuit is electrically connected to the signal input terminal of the interface connector
  • the step of providing the low-potential voltage to the display panel by the low-potential circuit includes: The low-potential circuit directly reduces the common electrode voltage input to the interface connector to the low-potential voltage.
  • the signal output terminal of the low-potential circuit is electrically connected to the common electrode voltage output terminal of the interface connector, and the common electrode voltage output terminal of the interface connector is electrically connected to the display panel,
  • the step of the low-potential circuit providing a low-potential voltage to the display panel includes: the low-potential circuit directly reduces the common electrode voltage output by the interface connector to the low-potential voltage.
  • the low-potential circuit includes a switch tube, the signal input terminal of the switch tube is connected to a low-potential voltage, and the signal control terminal of the switch tube is electrically connected to the control circuit, so The signal output terminal of the switch tube is electrically connected to the common electrode voltage input terminal of the display panel.
  • the step of providing a low potential voltage to the display panel by the low potential circuit includes: when the switch tube is turned on, the low potential voltage Output to the common electrode voltage input terminal of the display panel.
  • the switch tube is an NMOS tube
  • the gate of the NMOS tube is connected to the control circuit
  • the source of the NMOS tube is connected to a low potential voltage
  • the drain of the NMOS tube is The electrode is electrically connected to the common electrode voltage input terminal of the display panel
  • the step of controlling the operation of the low-potential circuit by the control circuit includes: the control circuit inputs a high-level signal to the gate of the NMOS tube so that the The NMOS tube is turned on to output a low potential voltage to the common electrode voltage input terminal of the display panel.
  • the switch tube is a PMOS tube
  • the gate of the PMOS tube is connected to the control circuit
  • the drain of the PMOS tube is connected to a low potential voltage
  • the source of the PMOS tube is The electrode is electrically connected to the common electrode voltage input terminal of the display panel
  • the step of controlling the operation of the low-potential circuit by the control circuit includes: the control circuit inputs a low-level signal to the gate of the PMOS tube so that the The PMOS tube is turned on to output a low potential voltage to the common electrode voltage input terminal of the display panel.
  • the present application provides a display panel driving circuit and method, including a driving circuit, a low-potential circuit, and a control circuit.
  • the driving circuit is used to provide a common electrode voltage to the display panel; the low-potential circuit is used to provide the display panel with a common electrode voltage.
  • the control circuit is used to detect whether the display panel needs to be turned off, and when necessary, control the operation of the low potential circuit to convert the common electrode voltage of the display panel into the low potential voltage ;
  • the detection information obtained by the control circuit controls the operation of the low potential circuit, and converts the common electrode voltage of the display panel into a low potential voltage, so that the display panel is directly turned off to avoid occurrence After-image, it alleviates the technical problem of after-image after shutdown of the existing display device.
  • Fig. 1 is a schematic diagram of a conventional display panel driving circuit.
  • FIG. 2 is a first schematic diagram of a display panel driving circuit provided by an embodiment of the application.
  • FIG. 3 is a second schematic diagram of a display panel driving circuit provided by an embodiment of the application.
  • Figure 4 is a comparison diagram of the shutdown discharge curves.
  • the present application addresses the technical problem of the existing display device with power-off image retention, and the embodiments of the present application can alleviate this problem.
  • the existing display panel drive circuit generates the common electrode voltage through the drive circuit, namely VCOM in Figure 1.
  • the interface connector is electrically connected to the drive circuit and the display panel, and the common electrode voltage is transmitted to the display panel.
  • the discharge in the circuit is slow, which will cause the display panel to take a long time to discharge, causing the display device to have a problem of afterimages after shutdown.
  • the embodiments of the present application provide the following embodiments.
  • an embodiment of the present application provides a display panel driving circuit 2, which includes:
  • the driving circuit 21 is used to provide the common electrode voltage to the display panel
  • the low potential circuit 23 is used to provide a low potential voltage to the display panel
  • the control circuit 22 is used to detect whether the display panel needs to be turned off, and when necessary, to control the operation of the low potential circuit to convert the common electrode voltage of the display panel into the low potential voltage.
  • the embodiment of the application provides a display panel drive circuit, which includes a drive circuit, a low potential circuit, and a control circuit.
  • the drive circuit is used to provide a common electrode voltage to the display panel;
  • the control circuit is used to detect whether the display panel needs to be turned off, and when necessary, to control the operation of the low-potential circuit to convert the common electrode voltage of the display panel Is the low potential voltage; by adding a low potential circuit and a control circuit, when the display panel is turned off, the detection information obtained by the control circuit controls the operation of the low potential circuit, and converts the common electrode voltage of the display panel into a low potential voltage, so that the display The panel is directly closed to avoid the afterimage, which solves the technical problem of the existing display device with the afterimage after shutdown.
  • the display panel driving circuit 2 provided by the present application includes: a driving circuit 21, a control circuit 22, a low potential circuit 23, an interface connector and a display panel, and the driving circuit 21
  • the voltage terminal is provided with a power supply.
  • the drive circuit 21 sends the common electrode voltage (ie VCOM in Figure 2) to the display panel through the interface connector to make the display device display the screen or turn off, and the low potential circuit 23 provides a low potential voltage to the display panel.
  • the low-potential voltage is a voltage at which the display panel can be set to shut down completely, for example, the low-potential voltage is 0.
  • the control circuit 22 is used to detect whether the display panel needs to be turned off, and when necessary, control the low-potential circuit 23 to work , Converting the common electrode voltage received by the display panel into the low potential voltage.
  • the control circuit 22 is electrically connected to the voltage terminal of the drive circuit 21, and the signal output terminal of the low potential circuit 23 is electrically connected to the signal input terminal of the interface connector;
  • the control circuit detects that the voltage value of the voltage terminal changes from a high potential to a low potential, determines that the display panel needs to be turned off, and then controls the operation of the low potential circuit to input the input to the interface connector
  • the voltage of the common electrode drops directly to the low-potential voltage, and the voltage output by the interface connector to the display panel is the low-potential voltage, and the display panel is directly turned off, and there will be no problem of the display device being turned off.
  • the control circuit 22 is electrically connected to the output terminal of the driving circuit 21, and the signal output terminal of the low potential circuit 23 is electrically connected to the common electrode voltage output terminal of the interface connector.
  • the display device is turned off, the voltage value of the voltage terminal of the driving circuit decreases, and the control circuit detects that the common electrode voltage output by the driving circuit gradually decreases, thereby controlling the low potential voltage to output the common electrode of the interface connector.
  • the electrode voltage is directly reduced to the low potential voltage, the display panel is directly turned off, avoiding the problem of after-image after the display device is turned off.
  • the low-potential circuit 23 includes a switch tube 231, the signal input end of the switch tube 231 is connected to a low-potential voltage VDD, and the signal of the switch tube 231
  • the control terminal is electrically connected to the control circuit, and when the display panel is turned off, the signal output terminal of the switch tube 231 outputs the low-potential voltage, so that the display device is directly turned off to avoid image retention.
  • the switch tube 231 is an N-type switch tube, such as an NMOS tube, the gate of the NMOS tube is connected to the control circuit, and the source of the NMOS tube is connected to the low potential voltage VDD, and the The drain of the NMOS tube is electrically connected to the common electrode voltage input terminal of the display panel.
  • the switch tube 231 is a P-type switch tube, such as a PMOS tube, the gate of the PMOS tube is connected to the control circuit, and the drain of the PMOS tube is connected to the low potential voltage VDD, the The source of the PMOS tube is electrically connected to the common electrode voltage input terminal of the display panel.
  • curve 1 is a schematic diagram of the discharge of the existing display panel drive circuit
  • curve 2 is a schematic diagram of the discharge of the display panel drive circuit of this application.
  • voltage b represents the common electrode voltage when the display panel displays images
  • voltage a in the figure represents The low potential voltage when the display panel is completely closed.
  • the common electrode voltage of the existing display panel driving circuit will rapidly decrease when the display panel is turned off, but a part of the voltage will remain. This part of the voltage discharges slowly in the subsequent release process, making the display device After-images appear, and the voltage of the common electrode of the present application will be quickly reduced to a low potential voltage after the shutdown, so that the display device is turned off without the after-images.
  • the present application provides a display panel driving method, which includes the following steps:
  • the driving circuit provides the common electrode voltage to the display panel
  • the low-potential circuit provides a low-potential voltage to the display panel
  • the control circuit detects whether the display panel needs to be turned off, and when necessary, controls the operation of the low potential circuit to convert the common electrode voltage of the display panel into the low potential voltage.
  • control circuit is electrically connected to the voltage terminal of the drive circuit, and the step of the control circuit detecting whether the display panel needs to be turned off includes: the control circuit determines whether it is necessary to turn off the display panel according to the voltage value of the voltage terminal. The display panel.
  • the step of determining whether the display panel needs to be turned off by the control circuit according to the voltage value of the voltage terminal includes: when the voltage value changes from a high potential to a low potential, the control circuit determines that the display panel needs to be turned off. The display panel.
  • control circuit is electrically connected to the output terminal of the driving circuit, and the step of the control circuit detecting whether the display panel needs to be closed includes: the control circuit judges whether the display panel needs to be closed according to the change trend of the common electrode voltage. The display panel.
  • the step of determining whether the display panel needs to be turned off by the control circuit according to the change trend of the common electrode voltage includes, when the change trend gradually becomes smaller, the control circuit determines that the display panel needs to be turned off. panel.
  • the signal output end of the low-potential circuit is electrically connected to the signal input end of the interface connector, and the step of providing the low-potential voltage to the display panel by the low-potential circuit includes: The common electrode voltage to the interface connector directly drops to the low potential voltage.
  • the signal output terminal of the low potential circuit is electrically connected to the common electrode voltage output terminal of the interface connector
  • the common electrode voltage output terminal of the interface connector is electrically connected to the display panel
  • the low potential circuit The step of providing a low potential voltage to the display panel includes: the low potential circuit directly reduces the common electrode voltage output by the interface connector to the low potential voltage.
  • the low-potential circuit includes a switch tube, the signal input terminal of the switch tube is connected to a low-potential voltage, the signal control terminal of the switch tube is electrically connected to the control circuit, and the signal of the switch tube is The output terminal is electrically connected to the common electrode voltage input terminal of the display panel, and the step of the low-potential circuit providing a low-potential voltage to the display panel includes: when the switch tube is turned on, outputting a low-potential voltage to the display The common electrode voltage input terminal of the panel.
  • the switch tube is an NMOS tube
  • the gate of the NMOS tube is connected to the control circuit
  • the source of the NMOS tube is connected to a low potential voltage
  • the drain of the NMOS tube is electrically connected to the
  • the common electrode voltage input terminal of the display panel the step of controlling the operation of the low-potential circuit by the control circuit includes: the control circuit inputs a high-level signal to the gate of the NMOS tube to make the NMOS tube turn on, The low potential voltage is output to the common electrode voltage input terminal of the display panel.
  • the switch tube is a PMOS tube
  • the gate of the PMOS tube is connected to the control circuit
  • the drain of the PMOS tube is connected to a low potential voltage
  • the source of the PMOS tube is electrically connected to the
  • the step of controlling the operation of the low-potential circuit by the control circuit includes: the control circuit inputs a low-level signal to the gate of the PMOS tube to turn on the PMOS tube, The low potential voltage is output to the common electrode voltage input terminal of the display panel.
  • the embodiments of the present application provide a display panel driving circuit and method, which include a driving circuit, a low potential circuit, and a control circuit.
  • the driving circuit is used to provide a common electrode voltage to the display panel;
  • the low potential circuit is used to provide The display panel provides a low potential voltage;
  • the control circuit is used to detect whether the display panel needs to be turned off, and when necessary, control the operation of the low potential circuit to convert the common electrode voltage of the display panel to the low Potential voltage; by adding a low-potential circuit and a control circuit, when the display panel is shut down, the control circuit controls the low-potential circuit to work through the received detection information, and converts the common electrode voltage of the display panel into a low-potential voltage, so that the display panel is directly turned off ,
  • the common electrode voltage input to the interface connector can be directly reduced to a low potential Voltage, so that

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  • Physics & Mathematics (AREA)
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Abstract

一种显示面板驱动电路（2）及方法，通过在显示面板关机时，控制低电位电路（23）工作，将显示面板的公共电极电压转换为低电位电压，使得显示面板直接关闭，避免出现残影，缓解了现有显示装置存在关机残影的技术问题。

Description

显示面板驱动电路及方法 技术领域
本申请涉及显示领域，尤其是涉及一种显示面板驱动电路及方法。
 背景技术
现有显示装置使用过程中，关机时由于驱动电路放电较慢，显示装置需要较长时间放电，造成关机后残影需要较长时间才能完全消失。
所以，现有显示装置存在关机残影的技术问题。
 技术问题
本申请提供一种显示面板驱动电路及方法，以缓解现有显示装置存在的关机残影的技术问题。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请提供一种显示面板驱动电路，其包括驱动电路、低电位电路和控制电路，所述驱动电路用于向显示面板提供公共电极电压；所述低电位电路用于向所述显示面板提供低电位电压，所述控制电路用于检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压。
在本申请提供的显示面板驱动电路中，所述控制电路电连接所述驱动电路的电压端，用于根据所述电压端的电压值判断是否需要关闭所述显示面板。
在本申请提供的显示面板驱动电路中，在所述电压值由高电位变为低电位时，所述控制电路判断需要关闭所述显示面板。
在本申请提供的显示面板驱动电路中，所述控制电路电连接驱动电路的输出端，用于根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板。
在本申请提供的显示面板驱动电路中，当所述变化趋势逐渐变小时，所述控制电路判断需要关闭所述显示面板。
在本申请提供的显示面板驱动电路中，所述低电位电路的信号输出端电连接接口连接器的信号输入端，用于将输入到所述接口连接器的公共电极电压直接降为所述低电位电压。
在本申请提供的显示面板驱动电路中，所述低电位电路的信号输出端电连接接口连接器的公共电极电压输出端，所述接口连接器的公共电极电压输出端电连接所述显示面板，用于将所述接口连接器输出的公共电极电压直接降为所述低电位电压。
在本申请提供的显示面板驱动电路中，所述低电位电路包括一个开关管，所述开关管的信号输入端连接低电位电压，所述开关管的信号控制端电连接所述控制电路，所述开关管的信号输出端在所述开关管打开时，输出所述低电位电压。
在本申请提供的显示面板驱动电路中，所述开关管为NMOS管，所述NMOS管的栅极连接所述控制电路，所述NMOS管的源极连接低电位电压，所述NMOS管的漏极电连接所述显示面板的公共电极电压输入端。
在本申请提供的显示面板驱动电路中，所述开关管为PMOS管，所述PMOS管的栅极连接所述控制电路，所述PMOS管的漏极连接低电位电压，所述PMOS管的源极电连接所述显示面板的公共电极电压输入端。
本申请提供一种显示面板驱动方法，其包括：
驱动电路向显示面板提供公共电极电压；
低电位电路向所述显示面板提供低电位电压；
控制电路检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压。
在本申请提供的显示面板驱动方法中，所述控制电路电连接所述驱动电路的电压端，所述控制电路检测是否需要关闭所述显示面板的步骤包括：控制电路根据所述电压端的电压值判断是否需要关闭所述显示面板。
在本申请提供的显示面板驱动方法中，所述控制电路根据所述电压端的电压值判断是否需要关闭所述显示面板的步骤包括：在所述电压值由高电位变为低电位时，所述控制电路判断需要关闭所述显示面板。
在本申请提供的显示面板驱动方法中，所述控制电路电连接驱动电路的输出端，所述控制电路检测是否需要关闭所述显示面板的步骤包括：控制电路根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板。
在本申请提供的显示面板驱动方法中，所述控制电路根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板的步骤包括，当所述变化趋势逐渐变小时，所述控制电路判断需要关闭所述显示面板。
在本申请提供的显示面板驱动方法中，所述低电位电路的信号输出端电连接接口连接器的信号输入端，所述低电位电路向所述显示面板提供低电位电压的步骤包括：所述低电位电路将输入到所述接口连接器的公共电极电压直接降为所述低电位电压。
在本申请提供的显示面板驱动方法中，所述低电位电路的信号输出端电连接接口连接器的公共电极电压输出端，所述接口连接器的公共电极电压输出端电连接所述显示面板，所述低电位电路向所述显示面板提供低电位电压的步骤包括：所述低电位电路将所述接口连接器输出的公共电极电压直接降为所述低电位电压。
在本申请提供的显示面板驱动方法中，所述低电位电路包括一个开关管，所述开关管的信号输入端连接低电位电压，所述开关管的信号控制端电连接所述控制电路，所述开关管的信号输出端电连接所述显示面板的公共电极电压输入端，所述低电位电路向所述显示面板提供低电位电压的步骤包括：在所述开关管打开时，将低电位电压输出至所述显示面板的公共电极电压输入端。
在本申请提供的显示面板驱动方法中，所述开关管为NMOS管，所述NMOS管的栅极连接所述控制电路，所述NMOS管的源极连接低电位电压，所述NMOS管的漏极电连接所述显示面板的公共电极电压输入端，所述控制电路控制所述低电位电路工作的步骤包括：所述控制电路向所述NMOS管的栅极输入高电平信号，使得所述NMOS管导通，将低电位电压输出至所述显示面板的公共电极电压输入端。
在本申请提供的显示面板驱动方法中，所述开关管为PMOS管，所述PMOS管的栅极连接所述控制电路，所述PMOS管的漏极连接低电位电压，所述PMOS管的源极电连接所述显示面板的公共电极电压输入端，所述控制电路控制所述低电位电路工作的步骤包括：所述控制电路向所述PMOS管的栅极输入低电平信号，使得所述PMOS管导通，将低电位电压输出至所述显示面板的公共电极电压输入端。
 有益效果
本申请提供一种显示面板驱动电路及方法，其包括驱动电路、低电位电路和控制电路，所述驱动电路用于向显示面板提供公共电极电压；所述低电位电路用于向所述显示面板提供低电位电压，所述控制电路用于检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压；通过增加低电位电路和控制电路，在显示面板关机时，通过控制电路得到的检测信息控制低电位电路工作，将显示面板的公共电极电压转换为低电位电压，使得显示面板直接关闭，避免出现残影，缓解了现有显示装置存在关机残影的技术问题。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，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他的附图。
图1为现有显示面板驱动电路示意图。
图2为本申请实施例提供的显示面板驱动电路的第一种示意图。
图3为本申请实施例提供的显示面板驱动电路的第二种示意图。
图4为关机放电曲线对比图。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，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申请，而非用以限制本申请。在图中，结构相似的单元是用以相同标号表示。
本申请针对现有显示装置存在关机残影的技术问题，本申请实施例可以缓解该问题。
如图1所示，现有的显示面板驱动电路通过驱动电路产生公共电极电压，即图1中的VCOM，接口连接器电连接驱动电路和显示面板，将公共电极电压传递给显示面板，在显示装置关机时，由于电路中放电较慢，会造成显示面板需要较长时间放电，使显示装置存在关机残影的问题，针对该问题，本申请实施例提供以下实施例。
在一种实施例中，如图2、图3所示，本申请实施例提供一种显示面板驱动电路2，其包括：
驱动电路21，用于向显示面板提供公共电极电压
低电位电路23，用于向所述显示面板提供低电位电压
控制电路22，用于检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压。
在本实施例中，本申请实施例提供一种显示面板驱动电路，其包括驱动电路、低电位电路和控制电路，所述驱动电路用于向显示面板提供公共电极电压；所述低电位电路用于向所述显示面板提供低电位电压，所述控制电路用于检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压；通过增加低电位电路和控制电路，在显示面板关机时，通过控制电路得到的检测信息控制低电位电路工作，将显示面板的公共电极电压转换为低电位电压，使得显示面板直接关闭，避免出现残影，解决了现有显示装置存在关机残影的技术问题。
在一种实施例中，如图2、图3所示，本申请提供的显示面板驱动电路2包括：驱动电路21、控制电路22、低电位电路23、接口连接器和显示面板，驱动电路21电压端设有电源，驱动电路21将公共电极电压（即图2中的VCOM）通过接口连接器给到显示面板，使显示装置显示画面或者关闭，低电位电路23向显示面板提供低电位电压，其中所述低电位电压为可设显示面板完全关闭的电压，例如低电位电压为0，所述控制电路22用于检测是否需要关闭显示面板，并在需要时，控制所述低电位电路23工作，使所述显示面板接收的公共电极电压转换为所述低电位电压。
在一种实施例中，如图2所示，所述控制电路22电连接所述驱动电路21的电压端，所述低电位电路23的信号输出端电连接接口连接器的信号输入端；在显示装置关机时，控制电路检测到所述电压端的电压值由高电位变为低电位，判断需要关闭所述显示面板，然后通过控制所述低电位电路工作，将输入到所述接口连接器的公共电极电压直接降为所述低电位电压，则接口连接器输出给显示面板的电压为低电位电压，则显示面板直接关闭，不会存在显示装置关机残影的问题。
在一种实施例中，如图3所示，所述控制电路22电连接所述驱动电路21的输出端，所述低电位电路23的信号输出端电连接接口连接器的公共电极电压输出端，在显示装置关机时，驱动电路的电压端的电压值降低，所述控制电路检测到驱动电路输出的公共电极电压变化趋势逐渐降低，从而控制所述低电位电压将所述接口连接器输出的公共电极电压直接降为所述低电位电压，则所述显示面板直接关闭，避免出现显示装置关机残影的问题。
在一种实施例中，如图2、图3所示，所述低电位电路23包括一个开关管231，所述开关管231的信号输入端连接低电位电压VDD，所述开关管231的信号控制端电连接所述控制电路，在关闭所述显示面板时，所述开关管231的信号输出端输出所述低电位电压，使显示装置直接关闭，避免出现残影。
在一种实施例中，所述开关管231为N型开关管，如NMOS管，所述NMOS管的栅极连接所述控制电路，所述NMOS管的源极连接低电位电压VDD，所述NMOS管的漏极电连接所述显示面板的公共电极电压输入端。
在一种实施例中，所述开关管231为P型开关管，如PMOS管，所述PMOS管的栅极连接所述控制电路，所述PMOS管的漏极连接低电位电压VDD，所述PMOS管的源极电连接所述显示面板的公共电极电压输入端。
如图4所示，曲线1为现有显示面板驱动电路放电示意图，曲线2为本申请显示面板驱动电路放电示意图，图中电压b表示显示面板显示画面时的公共电极电压，图中电压a表示显示面板完全关闭时的低电位电压，现有的显示面板驱动电路在关机时公共电极电压会迅速的降低，但会残留一部分电压，这部分电压在后续释放过程中放电较慢，使得显示装置会出现残影，而本申请在关机后公共电极电压会迅速的降低到低电位电压，使显示装置关闭，不出现残影。
基于上述实施例提供的电路，在一些实施例中，本申请提供了一种显示面板驱动方法，其包括以下步骤：
驱动电路向显示面板提供公共电极电压；
低电位电路向所述显示面板提供低电位电压；
控制电路检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压。
在一些实施例中，所述控制电路电连接所述驱动电路的电压端，所述控制电路检测是否需要关闭所述显示面板的步骤包括：控制电路根据所述电压端的电压值判断是否需要关闭所述显示面板。
在一些实施例中，所述控制电路根据所述电压端的电压值判断是否需要关闭所述显示面板的步骤包括：在所述电压值由高电位变为低电位时，所述控制电路判断需要关闭所述显示面板。
在一些实施例中，所述控制电路电连接驱动电路的输出端，所述控制电路检测是否需要关闭所述显示面板的步骤包括：控制电路根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板。
在一些实施例中，所述控制电路根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板的步骤包括，当所述变化趋势逐渐变小时，所述控制电路判断需要关闭所述显示面板。
在一些实施例中，所述低电位电路的信号输出端电连接接口连接器的信号输入端，所述低电位电路向所述显示面板提供低电位电压的步骤包括：所述低电位电路将输入到所述接口连接器的公共电极电压直接降为所述低电位电压。
在一些实施例中，所述低电位电路的信号输出端电连接接口连接器的公共电极电压输出端，所述接口连接器的公共电极电压输出端电连接所述显示面板，所述低电位电路向所述显示面板提供低电位电压的步骤包括：所述低电位电路将所述接口连接器输出的公共电极电压直接降为所述低电位电压。
在一些实施例中，所述低电位电路包括一个开关管，所述开关管的信号输入端连接低电位电压，所述开关管的信号控制端电连接所述控制电路，所述开关管的信号输出端电连接所述显示面板的公共电极电压输入端，所述低电位电路向所述显示面板提供低电位电压的步骤包括：在所述开关管打开时，将低电位电压输出至所述显示面板的公共电极电压输入端。
在一些实施例中，所述开关管为NMOS管，所述NMOS管的栅极连接所述控制电路，所述NMOS管的源极连接低电位电压，所述NMOS管的漏极电连接所述显示面板的公共电极电压输入端，所述控制电路控制所述低电位电路工作的步骤包括：所述控制电路向所述NMOS管的栅极输入高电平信号，使得所述NMOS管导通，将低电位电压输出至所述显示面板的公共电极电压输入端。
在一些实施例中，所述开关管为PMOS管，所述PMOS管的栅极连接所述控制电路，所述PMOS管的漏极连接低电位电压，所述PMOS管的源极电连接所述显示面板的公共电极电压输入端，所述控制电路控制所述低电位电路工作的步骤包括：所述控制电路向所述PMOS管的栅极输入低电平信号，使得所述PMOS管导通，将低电位电压输出至所述显示面板的公共电极电压输入端。
根据上述实施例可知：
本申请实施例提供一种显示面板驱动电路及方法，其包括驱动电路、低电位电路和控制电路，所述驱动电路用于向显示面板提供公共电极电压；所述低电位电路用于向所述显示面板提供低电位电压；所述控制电路用于检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压；通过增加低电位电路和控制电路，在显示面板关机时，控制电路通过接收到的检测信息控制低电位电路工作，将显示面板的公共电极电压转换为低电位电压，使显示面板直接关闭，避免显示装置出现残影，通过将控制电路电连接驱动电路的电压端，将低电位电压电连接接口连接器的信号输入端，可以将输入到接口连接器的公共电极电压直接降为低电位电压，从而使接口连接器输出的电压为低电位电压，直接关闭显示面板，避免显示装置出现残影；通过将控制电路电连接驱动电路的输出端，将低电位电路电连接接口连接器的公共电极电压输出端，使得在驱动电路输出的公共电极电压逐渐变小时，控制电路控制低电位电路工作，将接口连接器输出的公共电极电压直接降为低电位电压，直接关闭显示面板，避免显示装置出现残影。
综上所述，虽然本申请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申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种显示面板驱动电路，其包括：
    驱动电路，用于向显示面板提供公共电极电压；
    低电位电路，用于向所述显示面板提供低电位电压；
    控制电路，用于检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压。
  2. 如权利要求1所述的显示面板驱动电路，其中，所述控制电路电连接所述驱动电路的电压端，用于根据所述电压端的电压值判断是否需要关闭所述显示面板。
  3. 如权利要求2所述的显示面板驱动电路，其中，在所述电压值由高电位变为低电位时，所述控制电路判断需要关闭所述显示面板。
  4. 如权利要求1所述的显示面板驱动电路，其中，所述控制电路电连接驱动电路的输出端，用于根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板。
  5. 如权利要求4所述的显示面板驱动电路，其中，当所述变化趋势逐渐变小时，所述控制电路判断需要关闭所述显示面板。
  6. 如权利要求1所述的显示面板驱动电路，其中，所述低电位电路的信号输出端电连接接口连接器的信号输入端，用于将输入到所述接口连接器的公共电极电压直接降为所述低电位电压。
  7. 如权利要求1所述的显示面板驱动电路，其中，所述低电位电路的信号输出端电连接接口连接器的公共电极电压输出端，所述接口连接器的公共电极电压输出端电连接所述显示面板，用于将所述接口连接器输出的公共电极电压直接降为所述低电位电压。
  8. 如权利要求1所述的显示面板驱动电路，其中，所述低电位电路包括一个开关管，所述开关管的信号输入端连接低电位电压，所述开关管的信号控制端电连接所述控制电路，所述开关管的信号输出端在所述开关管打开时，输出所述低电位电压。
  9. 如权利要求8所述的显示面板驱动电路，其中，所述开关管为NMOS管，所述NMOS管的栅极连接所述控制电路，所述NMOS管的源极连接低电位电压，所述NMOS管的漏极电连接所述显示面板的公共电极电压输入端。
  10. 如权利要求8所述的显示面板驱动电路，其中，所述开关管为PMOS管，所述PMOS管的栅极连接所述控制电路，所述PMOS管的漏极连接低电位电压，所述PMOS管的源极电连接所述显示面板的公共电极电压输入端。
  11. 一种显示面板驱动方法，其包括：
    驱动电路向显示面板提供公共电极电压；
    低电位电路向所述显示面板提供低电位电压；
    控制电路检测是否需要关闭所述显示面板，并在需要时，控制所述低电位电路工作，以将所述显示面板的公共电极电压转换为所述低电位电压。
  12. 如权利要求11所述的显示面板驱动方法，其中，所述控制电路电连接所述驱动电路的电压端，所述控制电路检测是否需要关闭所述显示面板的步骤包括：控制电路根据所述电压端的电压值判断是否需要关闭所述显示面板。
  13. 如权利要求12所述的显示面板驱动方法，其中，所述控制电路根据所述电压端的电压值判断是否需要关闭所述显示面板的步骤包括：在所述电压值由高电位变为低电位时，所述控制电路判断需要关闭所述显示面板。
  14. 如权利要求11所述的显示面板驱动方法，其中，所述控制电路电连接驱动电路的输出端，所述控制电路检测是否需要关闭所述显示面板的步骤包括：控制电路根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板。
  15. 如权利要求14所述的显示面板驱动方法，其中，所述控制电路根据所述公共电极电压的变化趋势判断是否需要关闭所述显示面板的步骤包括，当所述变化趋势逐渐变小时，所述控制电路判断需要关闭所述显示面板。
  16. 如权利要求11所述的显示面板驱动方法，其中，所述低电位电路的信号输出端电连接接口连接器的信号输入端，所述低电位电路向所述显示面板提供低电位电压的步骤包括：所述低电位电路将输入到所述接口连接器的公共电极电压直接降为所述低电位电压。
  17. 如权利要求11所述的显示面板驱动方法，其中，所述低电位电路的信号输出端电连接接口连接器的公共电极电压输出端，所述接口连接器的公共电极电压输出端电连接所述显示面板，所述低电位电路向所述显示面板提供低电位电压的步骤包括：所述低电位电路将所述接口连接器输出的公共电极电压直接降为所述低电位电压。
  18. 如权利要求11所述的显示面板驱动方法，其中，所述低电位电路包括一个开关管，所述开关管的信号输入端连接低电位电压，所述开关管的信号控制端电连接所述控制电路，所述开关管的信号输出端电连接所述显示面板的公共电极电压输入端，所述低电位电路向所述显示面板提供低电位电压的步骤包括：在所述开关管打开时，将低电位电压输出至所述显示面板的公共电极电压输入端。
  19. 如权利要求18所述的显示面板驱动方法，其中，所述开关管为NMOS管，所述NMOS管的栅极连接所述控制电路，所述NMOS管的源极连接低电位电压，所述NMOS管的漏极电连接所述显示面板的公共电极电压输入端，所述控制电路控制所述低电位电路工作的步骤包括：所述控制电路向所述NMOS管的栅极输入高电平信号，使得所述NMOS管导通，将低电位电压输出至所述显示面板的公共电极电压输入端。
  20. 如权利要求18所述的显示面板驱动方法，其中，所述开关管为PMOS管，所述PMOS管的栅极连接所述控制电路，所述PMOS管的漏极连接低电位电压，所述PMOS管的源极电连接所述显示面板的公共电极电压输入端，所述控制电路控制所述低电位电路工作的步骤包括：所述控制电路向所述PMOS管的栅极输入低电平信号，使得所述PMOS管导通，将低电位电压输出至所述显示面板的公共电极电压输入端。
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