WO2020113709A1 - 驱动保护电路、显示装置及驱动保护方法 - Google Patents

驱动保护电路、显示装置及驱动保护方法 Download PDF

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Publication number
WO2020113709A1
WO2020113709A1 PCT/CN2018/123361 CN2018123361W WO2020113709A1 WO 2020113709 A1 WO2020113709 A1 WO 2020113709A1 CN 2018123361 W CN2018123361 W CN 2018123361W WO 2020113709 A1 WO2020113709 A1 WO 2020113709A1
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Prior art keywords
protection circuit
output
input terminal
electronic switch
voltage signal
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PCT/CN2018/123361
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English (en)
French (fr)
Inventor
黄笑宇
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惠科股份有限公司
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Publication of WO2020113709A1 publication Critical patent/WO2020113709A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters

Definitions

  • the present application relates to the field of display technology, in particular to a drive protection circuit, a display device, and a drive protection method.
  • the system motherboard will output the corresponding voltage to the power chip on the driver board. After the power chip boosts or lowers the voltage, it will be output to the driver board to provide the operating voltage for other chips on the driver board. If the voltage input to the driver board exceeds the withstand voltage value of other chips on the driver board, the chip will be damaged or burned, resulting in the display device not being able to display normally.
  • the present application provides a drive protection circuit, a display device, and a drive protection method.
  • the purpose is to prevent the voltage input to the drive board from exceeding the withstand voltage value of the chip on the drive board and causing the chip to be burnt out.
  • the present application provides a driving protection circuit, the driving protection circuit includes:
  • a voltage detection circuit the input terminal of the voltage detection circuit is connected to the power input terminal, and the voltage detection circuit is configured to output a corresponding signal when it detects that the voltage signal input from the power input terminal is greater than the reference voltage signal control signal;
  • a first electronic switch the controlled end of the first electronic switch is connected to the output end of the voltage detection circuit, the first end of the first electronic switch is connected to the power input end, and the first electronic switch The second end of the is connected to the power output end, and the first electronic switch is configured to be turned off according to the control signal output by the voltage detection circuit;
  • An overvoltage protection circuit the input terminal of the overvoltage protection circuit is connected to the power supply input terminal, the output terminal of the overvoltage protection circuit is connected to the power supply output terminal, and the overvoltage protection circuit is configured to When the first electronic switch is closed, the voltage signal input from the power input terminal is stepped down and output.
  • the voltage detection circuit includes a first comparator, a non-inverting input terminal of the first comparator is an input terminal of the voltage detection circuit, and an inverting input terminal of the first comparator inputs the With reference to the voltage signal, the output terminal of the first comparator is the output terminal of the voltage detection circuit.
  • the overvoltage protection circuit includes a first resistor, a first capacitor, and a diode, a first end of the first resistor is an input end of the overvoltage protection circuit, and a second end of the first resistor It is interconnected with one end of the first capacitor and the anode of the diode, the cathode of the diode is the output of the overvoltage protection circuit, and the other end of the first capacitor is grounded.
  • the first electronic switch is a P-type insulating field effect tube
  • the gate of the P-type insulating field effect tube is the controlled end of the first electronic switch
  • the P-type insulating field effect The drain and source of the tube are the first end and the second end of the first electronic switch, respectively.
  • the drive protection circuit further includes a timing controller, and an input terminal of the timing controller is connected to the power output terminal.
  • the drive protection circuit further includes a gate drive circuit and a source drive circuit.
  • the controlled ends of the gate drive circuit and the source drive circuit are respectively connected to the output ends of the timing controller.
  • the present application also provides a display device, the display device includes a drive protection circuit, the drive protection circuit includes:
  • a voltage detection circuit an input terminal of the voltage detection circuit is connected to the power input terminal, and the voltage detection circuit is configured to output a control signal when it is detected that the voltage signal input from the power input terminal is greater than the reference voltage signal ;
  • a first electronic switch the controlled end of the first electronic switch is connected to the output end of the voltage detection circuit, the first end of the first electronic switch is connected to the power input end, and the first electronic switch The second end of the is connected to the power output end, and the first electronic switch is configured to be turned off according to the control signal output by the voltage detection circuit;
  • An overvoltage protection circuit the input terminal of the overvoltage protection circuit is connected to the power supply input terminal, the output terminal of the overvoltage protection circuit is connected to the power supply output terminal, and the overvoltage protection circuit is configured to When the first electronic switch is closed, the voltage signal input from the power input terminal is stepped down and output.
  • the present application also provides a driving protection method, and the driving protection method includes:
  • Step S1 receiving the voltage signal input from the power input terminal
  • Step S2 judging whether the voltage signal input from the power input terminal is greater than the reference voltage signal
  • Step S3 When the voltage signal input from the power supply input terminal is greater than the reference voltage signal, the voltage signal input from the power supply input terminal is stepped down and output.
  • the voltage detection circuit detects whether the voltage input at the power supply input terminal is greater than the withstand voltage value of the chip on the drive board. When it is detected that the voltage input at the power input terminal is greater than the withstand voltage value of the chip on the drive board, pass The overvoltage protection circuit reduces the voltage input by the power input terminal before outputting, which can prevent the chip on the driving board from being burnt out and improve the reliability of the display device.
  • FIG. 1 is a structural block diagram of an embodiment of a drive protection circuit of the present application
  • FIG. 2 is a schematic diagram of a circuit structure of an embodiment of a drive protection circuit of the present application
  • FIG. 3 is a schematic flowchart of an embodiment of a method for driving protection according to the present application.
  • Label name Label name 10 Voltage detection circuit 20
  • the first electronic switch 30 Overvoltage protection circuit 40
  • Gate drive circuit 60
  • Source drive circuit M1 P-MOS tube U1 First comparator C1 First capacitor R1 First resistance GND Ground D1 diode Vref Reference voltage signal Vin Power input Vout Power output
  • the directional indications are only configured to be interpreted in a specific posture (as shown in the drawings (Shown) the relative positional relationship between the various components, the movement, etc., if the specific posture changes, the directional indication will change accordingly.
  • This application proposes a drive protection circuit.
  • the drive protection circuit includes:
  • the output terminal of 10 is connected to the controlled terminal of the first electronic switch 20; the first terminal of the first electronic switch 20 is connected to the power input terminal Vin, and the second terminal of the first electronic switch 20 is connected to The power output terminal Vout is connected; the input terminal of the overvoltage protection circuit 30 is connected to the power input terminal Vin, and the output terminal of the overvoltage protection circuit 30 is connected to the power output terminal Vout.
  • the voltage detection circuit 10 is configured to output a corresponding control signal when detecting that the voltage signal input from the power input terminal Vin is greater than the reference voltage signal Vref.
  • the voltage detection circuit 10 may use a voltage comparator, a Hall sensor, or a special voltage detection chip to realize voltage detection, which is not limited here.
  • the first electronic switch 20 has two states of closed and open, and can be implemented by various transistors, such as insulating field effect transistors, transistors, etc., which is not limited here.
  • the overvoltage protection circuit 30 is used to step down the voltage signal input from the power supply input terminal when the first electronic switch 20 is closed, and the overvoltage protection circuit 30 may use a rectification filter circuit or other The circuit capable of realizing voltage reduction is not limited here.
  • the driving protection circuit further includes a timing controller 40, a gate driving circuit 50, and a source driving circuit 60.
  • the timing controller is provided on a driving board, which may be a screen driving board of a display device.
  • the controlled ends of the gate drive circuit and the source drive circuit are respectively connected to the output ends of the timing controller.
  • the system motherboard will output the corresponding voltage to the power chip on the driver board. After the power chip boosts or lowers the voltage, it will be output to the driver board to provide the operating voltage for other chips on the driver board. If the voltage input to the driver board exceeds the withstand voltage value of other chips on the driver board, the chip will be damaged or burned, resulting in the display device not being able to display normally.
  • a voltage detection circuit 10 is provided to detect a voltage signal input from the power supply input Vin, that is, a voltage signal output from the driving power supply, and it is detected that the voltage signal input from the power supply input Vin is greater than the reference voltage signal At Vref, that is, when it is detected that the voltage signal output by the driving power supply is greater than the withstand voltage value of the chip on the driving board, the voltage detection circuit 10 outputs a high-level control signal to the first electronic switch 20 to control the first electronic switch 20 Closed, wherein the first electronic switch 20 and the overvoltage protection circuit 30 are connected in parallel.
  • the overvoltage protection voltage 30 reduces the voltage signal output by the driving power supply and outputs it to the drive Board to ensure that the voltage output to the driver board is within the withstand voltage range of the chip on it, so as to avoid the chip on the driver board from being burned due to excessive voltage.
  • the voltage detection circuit 10 When the voltage detection circuit 10 detects that the voltage signal input from the power input terminal Vin is less than the reference voltage signal Vref, that is, the voltage signal output by the drive power supply is within the withstand voltage range of the chip on the drive board, the voltage detection circuit 10 outputs a low level Control signals to the first electronic switch 20 to control the opening of the first electronic switch 20.
  • the voltage signal output by the driving power supply can be directly output to the driving board via the first electronic switch 20, so that the power input The voltage signal input at the terminal Vin is equal to the voltage signal output at the power output terminal Vout.
  • the voltage can be stepped down and then output, thereby avoiding the voltage input to the driver board If the chip is too large, the chip is burned out, which causes the display device to display abnormally, which improves the reliability of the display device.
  • the voltage detection circuit 10 includes a first comparator U1, and the non-inverting input terminal of the first comparator U1 is the input terminal of the voltage detection circuit 10, the first A reference voltage signal is input to the inverting input terminal of the comparator U1, and the output terminal of the first comparator U1 is the output terminal of the voltage detection circuit 10.
  • the characteristic of the first comparator U1 is that if the voltage at the non-inverting input terminal is greater than the voltage at the inverting input terminal, the first comparator U1 outputs a high level, if the voltage at the non-inverting input terminal is less than the voltage at the inverting input terminal, The first comparator U1 outputs a low level.
  • the non-inverting input terminal of the first comparator U1 receives the voltage signal output by the driving power supply; the inverting input terminal receives the reference voltage signal Vref output by an external circuit or a regulated power supply, etc.
  • the reference voltage signal Vref may be based on the resistance of the chip on the driver board
  • the voltage limit value is set, for example, the reference voltage signal Vref may be set to 14V according to the withstand voltage limit value of the chip.
  • the voltage signal received at the non-inverting input terminal is greater than the reference voltage signal received at the inverting input terminal, for example, the voltage signal received at the non-inverting input terminal is 16V, and the reference voltage signal Vref received at the inverting input terminal is 14V, that is, the driving power supply
  • the output voltage signal exceeds the withstand voltage limit value of the chip on the driver board. If the voltage signal is directly input to the driver board, the chip on the driver board will be burned.
  • the first comparator U1 outputs a high-level control signal to the first electronic switch 20 to control the first electronic switch 20 to close; the voltage signal received at the positive input terminal is less than the reference received at the reverse input terminal
  • the voltage signal Vref for example, the voltage signal received at the positive input terminal is 12V, and the reference voltage signal Vref received at the inverted input terminal is 14V, that is, the voltage signal output by the driving power supply is within the withstand voltage range of the chip on the driving board.
  • the first comparator U1 outputs a low-level control signal to the first electronic switch 20 to control the first electronic switch 20 to open.
  • the first electronic switch 20 is a P-MOS tube (P-type insulating field effect tube) M1
  • the gate of the P-MOS tube M1 is the first electronic switch.
  • the drain and source of the P-MOS tube M1 are the first end and the second end of the first electronic switch 20, respectively.
  • the P-MOS tube M1 has two states of on and off.
  • the P-MOS tube M1 When the voltage signal output by the driving power supply is less than the reference voltage signal Vref, the P-MOS tube M1 is turned on according to the low-level control signal output by the voltage detection circuit 10, so that the driving power supply
  • the output voltage signal can be directly output to the driver board via the P-MOS tube M1.
  • the voltage signal output by the driving power supply is 12V
  • the P-MOS tube M1 is in the on state, the voltage signal output to the driving board is also 12V.
  • the P-MOS transistor M1 When the voltage signal output by the driving power supply is greater than the reference voltage signal Vref, the P-MOS transistor M1 is turned off according to the high-level control signal output by the voltage detection circuit 10, so that the voltage signal output by the driving power supply cannot be directly output through the P-MOS transistor M1 To the driver board.
  • the first electronic switch 20 may also use N-type insulating field effect transistors, transistors, etc., which is not limited herein.
  • the overvoltage protection circuit 30 includes a first resistor R1, a first capacitor C1, and a diode D1, and the first end of the first resistor R1 is the overvoltage protection circuit 30.
  • the input end, the second end of the first resistor R1 is interconnected with one end of the first capacitor C1 and the anode of the diode D1, the cathode of the diode D1 is the output of the overvoltage protection circuit 30, The other end of the first capacitor C1 is grounded.
  • the overvoltage protection circuit 30 is used to step down the voltage signal output by the driving power supply and output it to the driving board when the first electronic switch 20 is in the off state.
  • the withstand voltage limit of the chip on the drive board is 14V, and the voltage signal output from the drive power supply is 16V.
  • the first electronic switch 20 is turned off; the voltage signal output from the drive power supply is conducted through the first resistor R1 and the first capacitor C1.
  • the voltage is output after the step-down process.
  • the voltage signal output by the driving power supply is 16V
  • the voltage signal output by the first resistor R1 and the first capacitor C1 to the driving board is 13V.
  • the overvoltage protection circuit 30 further includes a diode D1. Since the diode D1 has a unidirectional conduction characteristic, by setting the diode D1, when the first electronic switch 20 is turned on, current can be prevented from flowing to the ground through the first capacitor C1.
  • the present application also proposes a display device including the drive protection circuit, the display panel and the drive board as described in any of the above, the drive protection circuit further includes a timing controller 40, a gate drive circuit 50 and a source A driving circuit 60, an output end of the timing controller 40 is connected to the controlled ends of the gate driving circuit 50 and the source driving circuit 60, the timing controller 40 is disposed on the driving board, and the driving board It may be a panel driving board, and the gate driving circuit 50 and the source driving circuit 60 are electrically connected to the display panel, respectively.
  • the display device may be a display device with a display panel such as a television, a tablet computer, and a mobile phone.
  • the display panel can be any of the following: liquid crystal display panel, OLED display panel, QLED display panel, twisted nematic (Twisted Nematic, TN) or Super Twisted Nematic (STN) type, In-Plane Switching (IPS) type, Vertical Alignment (VA) type, curved type panel, or other display panel.
  • the driving protection method includes:
  • Step S1 receiving the voltage signal input from the power input terminal
  • Step S2 Determine whether the voltage signal input from the power supply input terminal is greater than the reference voltage signal
  • Step S3 When the voltage signal input from the power supply input terminal is greater than the reference voltage signal, the voltage signal input from the power supply input terminal is stepped down and output.
  • step S2 the method further includes:
  • Step S4 When the voltage signal input from the power input terminal is less than the reference voltage signal, output the voltage signal input from the power input terminal through the first electronic switch.
  • the drive protection method is applied to a drive protection circuit including a power input terminal Vin, a power output terminal Vout, a voltage detection circuit 10, a first electronic switch 20, and an overvoltage protection circuit 30;
  • the voltage detection circuit 20 detects the voltage signal output by the driving power supply. When it is detected that the voltage signal output by the driving power supply is greater than the reference voltage signal Vref, the voltage detection circuit 10 outputs a high-level control signal to the first electronic switch 20. In order to control the first electronic switch 20 to turn off, when the first electronic switch 20 is turned off, the overvoltage protection voltage 30 reduces the voltage signal output by the driving power supply and outputs it to the driving board.
  • the voltage detection circuit 10 When the voltage detection circuit 10 detects that the voltage signal output by the driving power supply is less than the reference voltage signal Vref, the voltage detection circuit 10 outputs a low-level control signal to the first electronic switch 20 to control the first electronic switch 20 to open. When the electronic switch 20 is opened, the voltage signal output by the driving power supply can be directly output to the driving board via the first electronic switch 20.
  • the voltage detection circuit 10 detects the output voltage of the driving power supply, and when it is detected that the output voltage of the driving power supply is greater than the withstand voltage value of the chip on the driving board, the output voltage is detected by the overvoltage protection circuit 30. Performing the voltage reduction and then outputting can prevent the chip of the driving board from being burnt out, and improve the reliability of the display device.

Abstract

一种驱动保护电路、显示装置及驱动保护方法，该驱动保护电路包括：电源输入端（Vin）、电源输出端（Vout）、电压检测电路（10）、第一电子开关（20）及过压保护电路（30）；电压检测电路（10）的输入端与电源输入端（Vin）连接，电压检测电路（10）的输出端与第一电子开关（20）的受控端连接；第一电子开关（20）的第一端与电源输入端（Vin）连接，第一电子开关（20）的第二端与电源输出端（Vout）连接；过压保护电路（30）的输入端与电源输入端（Vin）连接，过压保护电路（30）的输出端与电源输出端（Vout）连接。

Description

驱动保护电路、显示装置及驱动保护方法
相关申请
本申请要求2018年12月04日申请的，申请号201811485912.7，名称为“驱动保护电路、显示装置及驱动保护方法”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及显示技术领域，特别涉及一种驱动保护电路、显示装置及驱动保护方法。
背景技术
显示装置中，系统主板会输出对应的电压至驱动板上的电源芯片，电源芯片对该电压进行升压或者降压后，输出至驱动板上，为驱动板上的其他芯片提供工作电压，然而，若输入至驱动板上的电压超过驱动板上其他芯片的耐压值，会造成芯片的损伤或者烧坏，导致显示装置无法正常显示。
申请内容
本申请提供一种驱动保护电路、显示装置及驱动保护方法，旨在实现避免输入至驱动板上的电压超过驱动板上芯片的耐压值，导致芯片被烧坏的目的。
为实现上述目的，本申请提供一种驱动保护电路，所述驱动保护电路包括：
电源输入端；
电源输出端；
电压检测电路，所述电压检测电路的输入端与所述电源输入端连接，所述电压检测电路，被配置为在检测到所述电源输入端输入的电压信号大于参考电压信号时，输出对应的控制信号；
第一电子开关，所述第一电子开关的受控端与所述电压检测电路的输出端连接，所述第一电子开关的第一端与所述电源输入端连接，所述第一电子开关的第二端与所述电源输出端连接，所述第一电子开关，被配置为根据所述电压检测电路输出的控制信号关闭；
过压保护电路，所述过压保护电路的输入端与所述电源输入端连接，所述过压保护电路的输出端与所述电源输出端连接，所述过压保护电路，被配置为在所述第一电子开关关闭时，将所述电源输入端输入的电压信号进行降压后输出。
可选的，所述电压检测电路包括第一比较器，所述第一比较器的正相输入端为所述电压检测电路的输入端，所述第一比较器的反相输入端输入所述参考电压信号，所述第一比较器的输出端为所述电压检测电路的输出端。
可选的，所述过压保护电路包括第一电阻、第一电容及二极管，所述第一电阻的第一端为所述过压保护电路的输入端，所述第一电阻的第二端与所述第一电容的一端及所述二极管的正极互连，所述二极管的负极为所述过压保护电路的输出端，所述第一电容的另一端接地。
可选的，所述第一电子开关为P型绝缘性场效应管，所述P型绝缘性场效应管的栅极为所述第一电子开关的受控端，所述P型绝缘性场效应管的漏极与源极分别为所述第一电子开关的第一端及第二端。
可选的，所述驱动保护电路还包括时序控制器，所述时序控制器的输入端与所述电源输出端连接。
可选的，所述驱动保护电路还包括栅极驱动电路及源极驱动电路，所述栅极驱动电路和所述源极驱动电路的受控端分别与所述时序控制器的输出端连接。
为实现上述目的，本申请还提供一种显示装置，所述显示装置包括驱动保护电路，所述驱动保护电路包括：
电源输入端；
电源输出端；
电压检测电路，所述电压检测电路的输入端与所述电源输入端连接，所述电压检测电路，被配置为在检测到所述电源输入端输入的电压信号大于参考电压信号时，输出控制信号；
第一电子开关，所述第一电子开关的受控端与所述电压检测电路的输出端连接，所述第一电子开关的第一端与所述电源输入端连接，所述第一电子开关的第二端与所述电源输出端连接，所述第一电子开关，被配置为根据所述电压检测电路输出的控制信号关闭；
过压保护电路，所述过压保护电路的输入端与所述电源输入端连接，所述过压保护电路的输出端与所述电源输出端连接，所述过压保护电路，被配置为在所述第一电子开关关闭时，将所述电源输入端输入的电压信号降压后输出。
为实现上述目的，本申请还提供一种驱动保护方法，所述驱动保护方法包括：
步骤S1，接收电源输入端输入的电压信号；
步骤S2，判断所述电源输入端输入的电压信号是否大于参考电压信号；以及，
步骤S3，在所述电源输入端输入的电压信号大于所述参考电压信号时，将所述电源输入端输入的电压信号降压后输出。
本申请的技术方案，通过电压检测电路检测电源输入端输入的电压是否大于驱动板上的芯片的耐压值，在检测到电源输入端输入的电压大于驱动板上芯片的耐压值时，通过过压保护电路对电源输入端输入的电压进行先降压再输出，可以避免驱动板上的芯片被烧坏，提高了显示装置的可靠性。
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示出的结构获得其他的附图。
图1为本申请驱动保护电路一实施例的结构框图；
图2为本申请驱动保护电路一实施例的电路结构示意；
图3为本申请驱动保护方法一实施例的流程示意图。
附图标号说明：
标号 名称 标号 名称
10 电压检测电路 20 第一电子开关
30 过压保护电路 40 时序控制器
50 栅极驱动电路 60 源极驱动电路
M1 P-MOS管 U1 第一比较器
C1 第一电容 R1 第一电阻
GND 接地端 D1 二极管
Vref 参考电压信号 Vin 电源输入端
Vout 电源输出端
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明，若本申请实施例中有涉及方向性指示（诸如上、下、左、右、前、后……），则该方向性指示仅被配置为解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，若本申请实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅被配置为描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
本申请提出一种驱动保护电路。
参照图1，该驱动保护电路包括：
电源输入端Vin、电源输出端Vout、电压检测电路10、第一电子开关20及过压保护电路30；所述电压检测电路10的输入端与所述电源输入端Vin连接，所述电压检测电路10的输出端与所述第一电子开关20的受控端连接；所述第一电子开关20的第一端与所述电源输入端Vin连接，所述第一电子开关20的第二端与所述电源输出端Vout连接；所述过压保护电路30的输入端与所述电源输入端Vin连接，所述过压保护电路30的输出端与所述电源输出端Vout连接。
所述电压检测电路10，用于在检测到电源输入端Vin输入的电压信号大于所述参考电压信号Vref时，输出对应的控制信号。该电压检测电路10可以采用电压比较器、霍尔传感器或者专门的电压检测芯片等实现电压检测，此处不限。
所述第一电子开关20，具有关闭和打开两种状态，可以采用各种晶体管实现，例如绝缘性场效应管、三极管等，此处不限。
所述过压保护电路30，用于在所述第一电子开关20关闭时，将所述电源输入端输入的电压信号进行降压后输出，该过压保护电路30可以采用整流滤波电路或者其他能够实现降压的电路，此处不限。
所述驱动保护电路还包括时序控制器40、栅极驱动电路50及源极驱动电路60，所述时序控制器设置在驱动板上，该驱动板可以为显示装置的屏驱动板。所述栅极驱动电路和所述源极驱动电路的受控端分别与所述时序控制器的输出端连接。
显示装置中，系统主板会输出对应的电压至驱动板上的电源芯片，电源芯片对该电压进行升压或者降压后，输出至驱动板上，为驱动板上的其他芯片提供工作电压，然而，若输入至驱动板上的电压超过驱动板上其他芯片的耐压值，会造成芯片的损伤或者烧坏，导致显示装置无法正常显示。
为了解决上述问题，本申请的技术方案，通过设置电压检测电路10检测电源输入端Vin输入的电压信号，即驱动电源输出的电压信号，在检测到电源输入端Vin输入的电压信号大于参考电压信号Vref时，也即在检测到驱动电源输出的电压信号大于驱动板上芯片的耐压值时，电压检测电路10输出高电平的控制信号至第一电子开关20，以控制第一电子开关20关闭，其中，该第一电子开关20与所述过压保护电路30为并联连接，在第一电子开关20关闭时，过压保护电压30将驱动电源输出的电压信号进行降压后输出至驱动板，以确保输出至驱动板的电压处于其上芯片的耐压范围内，从而避免由于电压过高而导致驱动板上的芯片被烧坏。
在电压检测电路10检测到电源输入端Vin输入的电压信号小于参考电压信号Vref时，也即驱动电源输出的电压信号处于驱动板上芯片的耐压范围内，电压检测电路10输出低电平的控制信号至第一电子开关20，以控制第一电子开关20打开，在第一电子开关20打开时，驱动电源输出的电压信号可以经第一电子开关20直接输出至驱动板，从而使得电源输入端Vin输入的电压信号与电源输出端Vout输出的电压信号相等。
本申请的技术方案，通过对驱动电源输出的电压进行有效检测，可以在其输出的电压超过芯片的耐压值时，对该电压进行降压后再输出，从而避免由于输入至驱动板的电压过大而导致芯片被烧坏，导致显示装置显示异常，提高了显示装置的可靠性。
在一实施例中，参照图2，所述电压检测电路10包括第一比较器U1，所述第一比较器U1的正相输入端为所述电压检测电路10的输入端，所述第一比较器U1的反相输入端输入参考电压信号，所述第一比较器U1的输出端为所述电压检测电路10的输出端。
本实施例中，第一比较器U1的特性为，若正相输入端的电压大于反相输入端的电压，第一比较器U1输出高电平，若正相输入端的电压小于反相输入端的电压，第一比较器U1输出低电平。第一比较器U1的正相输入端接收驱动电源输出的电压信号；反相输入端接收外部电路或者稳压电源等输出的参考电压信号Vref，该参考电压信号Vref可以根据驱动板上芯片的耐压极限值设置，例如，参考电压信号Vref可以根据芯片的耐压极限值设置为14V。在正相输入端接收的电压信号大于反相输入端接收的参考电压信号时，例如，正相输入端接收的电压信号为16V，反相输入端接收的参考电压信号Vref为14V，即驱动电源输出的电压信号超过了驱动板上芯片的耐压极限值，若该电压信号直接输入至驱动板，会导致驱动板上芯片被烧坏。此时，第一比较器U1输出高电平的控制信号至所述第一电子开关20，以控制第一电子开关20关闭；在正相输入端接收的电压信号小于反相输入端接收的参考电压信号Vref时，例如，正相输入端接收的电压信号为12V，反相输入端接收的参考电压信号Vref为14V，即驱动电源输出的电压信号处于驱动板上芯片的耐压范围，此时，第一比较器U1输出低电平的控制信号至所述第一电子开关20，以控制第一电子开关20打开。
在一实施例中，参照图2，所述第一电子开关20为P-MOS管（P型绝缘性场效应管）M1，所述P-MOS管M1的栅极为所述第一电子开关的受控端，所述P-MOS管M1的漏极与源极分别为所述第一电子开关20的第一端及第二端。
P-MOS管M1具有打开和关闭两种状态，在驱动电源输出的电压信号小于参考电压信号Vref时，P-MOS管M1根据电压检测电路10输出的低电平的控制信号打开，使得驱动电源输出的电压信号可以经P-MOS管M1直接输出至驱动板上。例如，驱动电源输出的电压信号为12V，在P-MOS管M1为打开状态时，输出至驱动板的电压信号也为12V。在驱动电源输出的电压信号大于参考电压信号Vref时，P-MOS管M1根据电压检测电路10输出的高电平的控制信号关闭，使得驱动电源输出的电压信号无法直接经过P-MOS管M1输出至驱动板。在其他实施例中，所述第一电子开关20也可以采用N型绝缘性场效应管、三极管等，此处不限。
在一实施例中，参照图2，所述过压保护电路30包括第一电阻R1、第一电容C1及二极管D1，所述第一电阻R1的第一端为所述过压保护电路30的输入端，所述第一电阻R1的第二端与所述第一电容C1的一端及所述二极管D1的正极互连，所述二极管D1的负极为所述过压保护电路30的输出端，所述第一电容C1的另一端接地。
所述过压保护电路30，用于在第一电子开关20处于关闭状态时，将驱动电源输出的电压信号进行降压后输出至驱动板。例如，驱动板上芯片的耐压极限值为14V，驱动电源输出的电压信号为16V，此时，第一电子开关20关闭；驱动电源输出的电压信号经第一电阻R1及第一电容C1进行降压处理后输出，例如，驱动电源输出的电压信号为16V，经第一电阻R1及第一电容C1进行降压输出至驱动板的电压信号为13V。其中，所述第一电阻R1用于将驱动电源输出的电压信号中的直流部分进行降压处理，第一电容C1用于将驱动电源输出的电压信号中的交流部分进行降压处理及消除电压的尖峰。所述过压保护电路30还包括二极管D1，由于二极管D1具有单向导通特性，通过设置二极管D1，在所述第一电子开关20打开时，可以防止电流经第一电容C1流向地端。
本申请还提出一种显示装置，所述显示装置包括如上任一项所述的驱动保护电路、显示面板及驱动板，该驱动保护电路还包括时序控制器40、栅极驱动电路50和源极驱动电路60，所述时序控制器40的输出端与所述栅极驱动电路50和源极驱动电路60的受控端连接，所述时序控制器40设置在所述驱动板上，该驱动板可以为屏驱动板，所述栅极驱动电路50和所述源极驱动电路60分别与所述显示面板电连接。该驱动保护电路的详细结构可参照上述实施例，此处不再赘述；可以理解的是，由于在本申请显示装置中使用了上述驱动保护电路，因此，本申请显示装置的实施例包括上述驱动保护电路全部实施例的全部技术方案，且所达到的技术效果也完全相同，在此不再赘述。
本实施例中，显示装置可以是电视机、平板电脑、手机等具有显示面板的显示装置。该显示面板可以为以下任一种：液晶显示面板、OLED显示面板、QLED显示面板、扭曲向列(Twisted Nematic，TN)或超扭曲向列(Super Twisted Nematic，STN)型，平面转换(In-Plane Switching，IPS)型、垂直配向(Vertical Alignment，VA)型、曲面型面板、或其他显示面板。
本申请还提出一种驱动保护方法，参照图3，所述驱动保护方法包括：
步骤S1，接收电源输入端输入的电压信号；
步骤S2，判断所述电源输入端输入的电压信号是否大于参考电压信号；
步骤S3，在所述电源输入端输入的电压信号大于所述参考电压信号时，将所述电源输入端输入的电压信号降压后输出。
可选的，所述步骤S2之后，还包括：
步骤S4，在所述电源输入端输入的电压信号小于所述参考电压信号时，将所述电源输入端输入的电压信号经第一电子开关输出。
本实施例中，所述驱动保护方法应用于驱动保护电路上，该驱动保护电路包括电源输入端Vin、电源输出端Vout、电压检测电路10、第一电子开关20及过压保护电路30；
具体的，通过电压检测电路20检测驱动电源输出的电压信号，在检测到驱动电源输出的电压信号大于参考电压信号Vref时，电压检测电路10输出高电平的控制信号至第一电子开关20，以控制第一电子开关20关闭，在第一电子开关20关闭时，过压保护电压30将驱动电源输出的电压信号进行降压后输出至驱动板。
在电压检测电路10检测到驱动电源输出的电压信号小于参考电压信号Vref时，电压检测电路10输出低电平的控制信号至第一电子开关20，以控制第一电子开关20打开，在第一电子开关20打开时，驱动电源输出的电压信号可以经第一电子开关20直接输出至驱动板。
本实施例的技术方案，通过电压检测电路10检测驱动电源输出的电压大小，并在检测到驱动电源输出的电压大于驱动板上芯片的耐压值时，通过过压保护电路30对输出的电压进行先降压再输出，可以避免驱动板的芯片被烧坏，提高了显示装置的可靠性。
以上所述仅为本申请的可选实施例，并非因此限制本申请的专利范围，凡是在本申请的发明构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。

Claims (20)

  1. 一种驱动保护电路，其中，所述驱动保护电路包括：
    电源输入端；
    电源输出端；
    电压检测电路，所述电压检测电路的输入端与所述电源输入端连接，所述电压检测电路，被配置为在检测到所述电源输入端输入的电压信号大于参考电压信号时，输出控制信号；
    第一电子开关，所述第一电子开关的受控端与所述电压检测电路的输出端连接，所述第一电子开关的第一端与所述电源输入端连接，所述第一电子开关的第二端与所述电源输出端连接，所述第一电子开关，被配置为根据所述电压检测电路输出的控制信号关闭；
    过压保护电路，所述过压保护电路的输入端与所述电源输入端连接，所述过压保护电路的输出端与所述电源输出端连接，所述过压保护电路，被配置为在所述第一电子开关关闭时，将所述电源输入端输入的电压信号降压后输出。
  2. 如权利要求1所述的驱动保护电路，其中，所述电压检测电路包括第一比较器，所述第一比较器的正相输入端为所述电压检测电路的输入端，所述第一比较器的反相输入端输入所述参考电压信号，所述第一比较器的输出端为所述电压检测电路的输出端。
  3. 如权利要求1所述的驱动保护电路，其中，所述过压保护电路包括第一电阻、第一电容及二极管，所述第一电阻的第一端为所述过压保护电路的输入端，所述第一电阻的第二端与所述第一电容的一端及所述二极管的正极互连，所述二极管的负极为所述过压保护电路的输出端，所述第一电容的另一端接地。
  4. 如权利要求1所述的驱动保护电路，其中，所述第一电子开关为P型绝缘性场效应管，所述P型绝缘性场效应管的栅极为所述第一电子开关的受控端，所述P型绝缘性场效应管的漏极与源极分别为所述第一电子开关的第一端及第二端。
  5. 如权利要求1所述的驱动保护电路，其中，所述驱动保护电路还包括时序控制器，所述时序控制器的输入端与所述电源输出端连接。
  6. 如权利要求5所述的驱动保护电路，其中，所述驱动保护电路还包括栅极驱动电路及源极驱动电路，所述栅极驱动电路和所述源极驱动电路的受控端分别与所述时序控制器的输出端连接。
  7. 如权利要求1所述的驱动保护电路，其中，所述第一电子开关与所述过压保护电路为并联连接。
  8. 如权利要求1所述的驱动保护电路，其中，在第一电子开关打开时，所述电源输入端输入的电压信号与所述电源输出端输出的电压信号相等。
  9. 如权利要求1所述的驱动保护电路，其中，所述参考电压信号为14V。
  10. 一种显示装置，其中，所述显示装置包括驱动保护电路，所述驱动保护电路包括：
    电源输入端；
    电源输出端；
    电压检测电路，所述电压检测电路的输入端与所述电源输入端连接，所述电压检测电路，被配置为在检测到所述电源输入端输入的电压信号大于参考电压信号时，输出控制信号；
    第一电子开关，所述第一电子开关的受控端与所述电压检测电路的输出端连接，所述第一电子开关的第一端与所述电源输入端连接，所述第一电子开关的第二端与所述电源输出端连接，所述第一电子开关，被配置为根据所述电压检测电路输出的控制信号关闭；
    过压保护电路，所述过压保护电路的输入端与所述电源输入端连接，所述过压保护电路的输出端与所述电源输出端连接，所述过压保护电路，被配置为在所述第一电子开关关闭时，将所述电源输入端输入的电压信号降压后输出。
  11. 如权利要求10所述的显示装置，其中，所述驱动保护电路还包括时序控制器，所述时序控制器的输入端与所述电源输出端连接。
  12. 如权利要求11所述的显示装置，其中，所述驱动保护电路还包括栅极驱动电路及源极驱动电路，所述栅极驱动电路和所述源极驱动电路的受控端分别与所述时序控制器的输出端连接。
  13. 如权利要求12所述的显示装置，其中，所述显示装置还包括驱动板，所述时序控制器设置在所述驱动板上。
  14. 如权利要求13所述的显示装置，其中，所述显示装置还包括显示面板，所述驱动保护电路的栅极驱动电路和源极驱动电路分别与所述显示面板电连接。
  15. 如权利要求14所述的显示装置，其中，所述显示面板为液晶显示面板。
  16. 一种驱动保护方法，其中，所述驱动保护方法包括：
    步骤S1，接收电源输入端输入的电压信号；
    步骤S2，判断所述电源输入端输入的电压信号是否大于参考电压信号；以及，
    步骤S3，在所述电源输入端输入的电压信号大于所述参考电压信号时，将所述电源输入端输入的电压信号降压后输出。
  17. 如权利要求16所述的驱动保护方法，其中，所述步骤S2之后，还包括：
    步骤S4，在所述电源输入端输入的电压信号小于所述参考电压信号时，将所述电源输入端输入的电压信号经第一电子开关输出。
  18. 如权利要求17所述的驱动保护方法，其中，所述第一电子开关为P型绝缘性场效应管。
  19. 如权利要求16所述的驱动保护方法，其中，所述驱动保护方法应用于驱动保护电路上。
  20. 如权利要求16所述的驱动保护方法，其中，所述参考电压信号为14V。
PCT/CN2018/123361 2018-12-04 2018-12-25 驱动保护电路、显示装置及驱动保护方法 WO2020113709A1 (zh)

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