WO2020042389A1 - 一种过流保护电路、过流保护方法及显示装置 - Google Patents

一种过流保护电路、过流保护方法及显示装置 Download PDF

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Publication number
WO2020042389A1
WO2020042389A1 PCT/CN2018/116819 CN2018116819W WO2020042389A1 WO 2020042389 A1 WO2020042389 A1 WO 2020042389A1 CN 2018116819 W CN2018116819 W CN 2018116819W WO 2020042389 A1 WO2020042389 A1 WO 2020042389A1
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Prior art keywords
circuit
current
clock signal
current value
overcurrent protection
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PCT/CN2018/116819
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English (en)
French (fr)
Inventor
王明良
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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Priority to US16/313,783 priority Critical patent/US11070048B2/en
Publication of WO2020042389A1 publication Critical patent/WO2020042389A1/zh
Anticipated expiration legal-status Critical
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

Definitions

  • the present application relates to the technical field of overcurrent protection, and in particular, to an overcurrent protection circuit, an overcurrent protection method, and a display device.
  • Thin film transistor liquid crystal display (Thin Film Transistor-Liquid Crystal Display, TFT-LCD) is the most commonly used display device at present, the driving circuit of TFT-LCD includes power circuit (Power Integrated Circuit, Power IC), timing control circuit (Timer control register Integrated Circuit (TCON IC), Scan Driver Circuit (Gate Driver Integrated Circuit, Gate Driver IC).
  • the power supply circuit (Power IC) generates voltages required for other circuits to work according to the data and signals of the system.
  • the timing control circuit generates the working timing of the scan driving circuit according to the data and signals of the system.
  • the digital voltage is output to the gate of the TFT switch and controls the switching of each row of pixels.
  • the new gateless driver GDL (Gate driverless) driver architecture is more and more widely used.
  • the gateless driver circuit divides the original gate driver into a booster integrated circuit.
  • the circuit (level shifter integrated circuit) and shift register (shift register), the boost integrated circuit is set on the driver board, the shift register is set on the panel, the boost integrated circuit sends a clock signal CLK to the shift register, Progressive driving of scan lines is completed.
  • the operation inside the board will be abnormal.
  • the current flows from the high-order voltage VGH of the TFT on-state to the TFT low-order voltage VGL (from a positive input voltage to negative (Voltage output voltage), due to the abnormality in the board surface, the impedance between the high-order voltage VGH and the low-order voltage VGL is too low, which causes the current in the circuit to be too large.
  • a sudden change in current will result in an increase in the current signal and an excessive current will cause the LCD panel to burn out; therefore, an overcurrent protection circuit will be set in the boost integrated circuit and the power supply circuit (Power IC).
  • the corresponding power supply circuit or booster integrated circuit turns off the output; however, the abnormal conditions generated in the panel are various and sometimes occur.
  • the current generated by the output low-level voltage signal and multiple scan clock signals are too large, but they have not triggered their respective set current protection values. At this time, there will also be a panel.
  • the possibility of burnout so that the current generated by outputting low-level voltage and the current generated by outputting multiple scan clock signals are too large at the same time, but the respective current protection set values are not triggered, which causes the display panel to burn out and cause losses.
  • An object of the present application is to provide an overcurrent protection circuit, including, but not limited to, solving a problem in that the current generated when a low-order voltage cannot be monitored and the current generated when a plurality of scan clock signals are output are too large, without triggering the respective
  • the set value of the current protection causes the overall current to be too large and burns down the display panel.
  • an overcurrent protection circuit provided in the embodiment of the present application includes a voltage generation circuit, a current detection circuit, and a microcontroller;
  • An input terminal of the voltage generating circuit is connected to a power source, an output terminal of the voltage generating circuit is connected to an input terminal of the current detection circuit, and a first output terminal of the current detection circuit is connected to the microcontroller. First input terminal is connected;
  • the voltage generating circuit is connected to a power source and generates a low-order voltage to be transmitted to the current detection circuit; the current detection circuit generates a first current value according to the low-order voltage and transmits the first current value to the microcontroller; the The microcontroller outputs an over-current protection set value corresponding to the scan clock signal according to the total current value of the over-current protection circuit and the first current value.
  • the current detection circuit detects a current generated when a low-level voltage is output, and converts the current into a digital first current value, and stores and transmits the first current value to the microcontroller. .
  • the microcontroller includes a calculator to calculate an over-current protection setting value corresponding to the scan clock signal according to the total current value and the first current value.
  • the overcurrent protection circuit further includes a serial bus connected to the current detection circuit and the microcontroller;
  • the current detection circuit transmits the first current value to the microcontroller through the serial bus
  • the microcontroller outputs the over-current protection set value through the serial bus.
  • the serial bus is a bidirectional two-wire synchronous serial bus including a bidirectional serial data line and a clock line.
  • the overcurrent protection circuit further includes a level shifter, and the level shifter includes a voltage boost circuit and an overcurrent setting circuit;
  • An output terminal of the voltage boosting circuit is connected to a first input terminal of the overcurrent setting circuit
  • the voltage boosting circuit is connected to a first clock signal, generates a scanning clock signal according to the first clock signal, and transmits a second current value corresponding to the scanning clock signal to the overcurrent setting circuit;
  • the current setting circuit controls the level shifter to output the scan clock signal according to the second current value.
  • the overcurrent setting circuit controlling the level shifter to output the scan clock signal according to the second current value includes:
  • the current protection is activated, the level shifter does not output a corresponding scan clock signal, and stops driving of the current path;
  • the level shifter continues to output the scan clock signal, and controls the corresponding high-order or low-order voltage to drive the current path for charging or Discharge.
  • an output terminal of the microcontroller is connected to a second input terminal of the overcurrent setting circuit
  • the microcontroller transmits the overcurrent protection setting value to the overcurrent setting circuit through the serial bus.
  • the set value of the overcurrent protection is equal to a difference between the total current value and the first current value.
  • a second input terminal of the overcurrent setting circuit is connected to an output terminal of the microcontroller through the serial bus, and receives the overcurrent protection setting output by the microcontroller.
  • the overcurrent setting circuit controls the level shifter to output the scan clock signal according to the overcurrent protection setting value and the second current value;
  • the level converter is controlled to turn off the output.
  • the second input terminal of the microcontroller obtains a total current value of the overcurrent protection circuit, and the total current value is a value obtained by outputting a current value generated by outputting a low-order voltage and a set value of the overcurrent protection. sum.
  • the second output terminal of the current detection circuit outputs the low-order voltage to the scan line of the display panel.
  • the overcurrent protection circuit is disposed in a power circuit portion of the display device.
  • Another object of the present application is to provide an overcurrent protection method, including:
  • the current detection circuit obtains a low-order voltage generated by the voltage generation circuit
  • the current detection circuit obtains a first current value corresponding to the low-order voltage according to the low-order voltage
  • the microcontroller calculates a set value of the overcurrent protection corresponding to the scan clock signal according to the total current value of the overcurrent protection circuit and the first current value.
  • Another object of the present application is to provide a display device including a display panel and an overcurrent protection circuit, wherein the overcurrent protection circuit includes a voltage generation circuit, a current detection circuit, and a microcontroller;
  • An input terminal of the voltage generating circuit is connected to a power source, an output terminal of the voltage generating circuit is connected to an input terminal of the current detection circuit, and a first output terminal of the current detection circuit is connected to the microcontroller. First input terminal is connected;
  • the voltage generating circuit is connected to a power source and generates a low-order voltage to be transmitted to the current detection circuit; the current detection circuit generates a first current value according to the low-order voltage and transmits the first current value to the microcontroller; the The microcontroller outputs an over-current protection set value corresponding to the scan clock signal according to the total current value of the over-current protection circuit and the first current value.
  • the overcurrent protection circuit is disposed in a power circuit portion of the display device.
  • the current detection circuit detects a current generated when a low-level voltage is output, and converts the current into a digital first current value, and stores and transmits the first current value to the microcontroller. .
  • the microcontroller includes a calculator to calculate an over-current protection setting value corresponding to the scan clock signal according to the total current value and the first current value.
  • the overcurrent protection circuit further includes a level shifter, and the level shifter includes a voltage boost circuit and an overcurrent setting circuit;
  • An output terminal of the voltage boosting circuit is connected to a first input terminal of the overcurrent setting single circuit
  • the voltage boosting circuit is connected to a first clock signal, generates a scanning clock signal according to the first clock signal, and transmits a second current value corresponding to the scanning clock signal to the overcurrent setting circuit;
  • the current setting circuit controls the level shifter to output the scan clock signal according to the second current value.
  • the overcurrent setting circuit controlling the level shifter to output the scan clock signal according to the second current value includes:
  • the current protection is activated, the level shifter does not output a corresponding scan clock signal, and stops driving of the current path;
  • the level shifter continues to output the scan clock signal, and controls the corresponding high-order or low-order voltage to drive the current path for charging or Discharge.
  • the over-current protection circuit, the over-current protection method, and the display device provided in the embodiments of the present application determine the set value of the over-current protection corresponding to the scan clock signal by detecting the current value generated when the low-level voltage is output, and corresponding to the low-level voltage.
  • the over-current protection set value corresponding to the scanning clock signal can be controlled more accurately, and the display panel is protected from being burned.
  • FIG. 1 is a schematic structural diagram of an overcurrent protection current according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of an overall implementation of an overcurrent protection circuit provided by an embodiment of the present application
  • FIG. 3 is a schematic diagram of a current calculation comparison provided in an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • FIG. 1 a structural schematic diagram of an overcurrent protection current is provided in an embodiment of the present application. For convenience of explanation, only a part related to the embodiment of the present application is shown.
  • the over-current protection circuit shown in the figure is applied to a display device.
  • the over-current protection circuit is provided in the power supply circuit part of the display device.
  • the power supply circuit can generate five kinds of working voltage through the system interface input voltage, including The maximum on-state voltage VGH for turning on the transistor TFT; and the low-order voltage VGL that controls the switching of the thin-film transistor TFT state on the scan line.
  • the low-order voltage VGL can take a value of -5V and a maximum value of -40V.
  • the over-current protection circuit includes a voltage generation circuit 10, a current detection circuit 11, and a microcontroller 12.
  • An input terminal of the voltage generating circuit 10 is connected to a power source, an output terminal of the voltage generating circuit 10 is connected to an input terminal of the current detection circuit 11, and a first output terminal of the current detection circuit 11 is connected to the micro-controller.
  • the first input end of the device 12 is connected;
  • the voltage generating circuit 10 is connected to a power source and generates a low-order voltage to transmit to the current detecting circuit 11; the current detecting circuit 11 generates a first current value according to the low-order voltage and transmits the first current value to the microcontroller 12, wherein the current detection circuit detects a current generated when outputting a low-order voltage, and converts the current into a digital first current value, and stores and transmits the first current value to the microcontroller;
  • the microcontroller 12 outputs an overcurrent protection set value corresponding to the scan clock signal according to the total current value and the first current value of the overcurrent protection circuit.
  • the microcontroller 12 includes a calculator and The first current value calculates an overcurrent protection setting value corresponding to the scan clock signal.
  • the first current is a current value generated when the low-level voltage VGL is output.
  • the over-current protection setting value corresponding to the low-level voltage VGL is not set, but only occurs when the low-level voltage VGL is output.
  • the current is detected.
  • the total current value is the total current value of the power driving circuit measured by the current protection circuit, including the current value generated when the low-level voltage is output and the current value generated when the output clock signal or the clock signal transition occurs.
  • the current value can be a fixed value within a period of time, or it can be the total current value that changes according to the change in the working state of the circuit.
  • the scan clock signal is a clock signal that is output to the shift register and can directly drive the charge or discharge of the corresponding scan line path.
  • the output can turn on or off the thin film transistor TFT of the liquid crystal display.
  • Scan clock signal When the scan clock signal is changed from a low level to a high level, a forward current mutation occurs in the circuit, thereby increasing the current in the circuit.
  • the scan line of each channel corresponds to a low-order voltage signal and multiple clock signals.
  • the current corresponding to each clock signal is much smaller than the current generated by the output low-order voltage. Therefore, by detecting the current output by the low-order voltage, Controlling the current values of multiple clock signals in each path can more accurately and easily activate the over-current protection of the power driving circuit, thereby protecting the display panel.
  • the display panel includes a pixel array composed of multiple rows and columns of sub-pixels. Row sub-pixels are connected to the source driving module, and column sub-pixels are connected to the gate driving module. The number of rows and columns of the pixel array can be determined according to the specific Settings need to be made;
  • the source driver module can be any device or circuit that has the function of driving the pixels of the display panel, such as a source driver chip (IC) or a thin-film source driver chip (S-COF) , Source-Chip (on-Film), etc .
  • the gate drive module can be any device or circuit that has the function of scanning and charging the pixels of the display panel, such as a gate driver IC or a thin-film gate driver chip. (G-COF, Gate-Chip, Film).
  • FIG. 2 it is a schematic structural diagram of an overall implementation of an overcurrent protection circuit provided in an embodiment of the present application. For ease of description, only a part related to the embodiment of the present application is shown.
  • the over-current protection circuit includes a voltage generating circuit 10, a current detection circuit 11, and a microcontroller 12; a serial bus 20 connected to the current detection circuit 11 and the microcontroller 12; and a current detection circuit 11
  • the first current value is transmitted to the microcontroller 12 through the serial bus 20; the microcontroller 12 outputs the set value of the overcurrent protection corresponding to the scanning signal through the serial bus 20.
  • the microcontroller determines the over-current protection set value corresponding to the scan clock signal that needs to be output according to the obtained total current value and the first current value.
  • the overcurrent protection circuit further includes a level shifter 21, which includes a voltage boosting circuit 211 and an overcurrent setting circuit 212; an output terminal of the voltage boosting circuit 211 and an overcurrent setting circuit 212 The first input terminal is connected; the voltage boosting circuit 211 is connected to the first clock signal, generates a scanning clock signal according to the first clock signal, and transmits a second current value corresponding to the scanning clock signal to the overcurrent setting circuit 212; The current setting circuit 212 controls the level shifter to output a scan clock signal based on the second current value.
  • the level shifter does not output the corresponding scan clock signal, and stops the driving of the current path; if the scan clock signal corresponds to When the second current value is within the over-current protection set value range, the level shifter continues to output the scanning clock signal, controls the corresponding high-order or low-order voltage to be output, and drives the current path to charge or discharge.
  • the scan clock signal may be a vertical clock signal.
  • the vertical clock signal controls the timing of the logic signal output by the shift register.
  • the output logic signal is used to generate a high-order voltage VGH and a low-order voltage VGL of the corresponding path.
  • the level shifter is used to convert a low-voltage logic level VDD / VSS into a high-amplitude voltage VGH / VGL, and is realized by a step-up operation of the level shifter.
  • the level shifter is a key part of the scan drive circuit.
  • the low-voltage logic level signal is first reduced to the low-level voltage VGL of the entire integrated circuit, and then raised to the high-level voltage VGH;
  • the level shifter outputs a digital signal corresponding to a high-order voltage and a low-order voltage, for example, a clock signal.
  • the output terminal of the microcontroller 12 is connected to the second input terminal of the overcurrent setting circuit 212; the microcontroller 12 transmits the overcurrent protection set value to the overcurrent device through the serial bus 20
  • the fixed circuit 212 changes the over-current setting value of the over-current setting circuit 212 through the over-current protection setting value transmitted by the microcontroller 12 in real time, thereby realizing the linkage between the current of VGL and the current of the scan clock signal.
  • the over-current setting value of the level shifter will be correspondingly reduced, and the level shifter will more easily activate over-current protection, so that the output can be turned off to achieve the purpose of protecting the display panel.
  • the serial bus 20 is a bidirectional two-wire synchronous serial bus I2C including a bidirectional serial data line and a clock line.
  • the serial bus may also be another universal serial bus.
  • the set value of the overcurrent protection is equal to the difference between the total current value and the first current value.
  • the embodiment of the present application as shown in FIG. 3 provides a current calculation comparison table. If the total value of the current in a certain period of time is 250 mA, and the current generated by the VGL voltage is 200 mA, the overcurrent of the level shifter is set.
  • the protection set value is 50mA; when the current generated by the VGL voltage is 170mA, the overcurrent protection set value of the level shifter is set to 80mA; the magnitude of the current controlled by the overcurrent protection circuit provided in the embodiment of the present application changes When the total current is first set, the current of VGL changes continuously, and the over-current setting value of the level shifter also changes continuously, so as to achieve more accurate over-current protection.
  • the second input terminal of the overcurrent setting circuit 212 is connected to the output terminal of the microcontroller 12 through the serial bus I2C, and receives the overcurrent protection setting value output by the microcontroller; the overcurrent setting circuit 212 controls the level shifter to output a scan clock signal according to the set value of the overcurrent protection and the second current value.
  • the level shifter is controlled to turn off the output; when the level shifter is turned off, the corresponding digital signal of the low-level voltage VGL is not output, and the display panel In the driving circuit, the low-level voltage will not be output, and the state switching of the thin film transistor will not be driven.
  • the impedance between the positive electrical input pin of the liquid crystal display and the negative electrical input pin of the liquid crystal display may be too low, so that the current generated when the output voltage is too large;
  • the overcurrent setting value of the level shifter will be reduced from 80mA to 50mA. If the current generated by the clock signal of the level shifter exceeds the current overcurrent setting, When the value is set, the overcurrent protection is activated, the output clock signal is turned off, and the display panel is stopped from being driven, thereby protecting the display panel from being burned.
  • the second input terminal of the microcontroller receives the total current value of the overcurrent protection circuit, and the total current value is a value between the current value generated by the output low-order voltage and the set value of the overcurrent protection. sum.
  • the control level converter if the second current value is less than the over-current Baoding setting value, the control level converter outputs a scan clock signal, and at the same time, the second output terminal of the current detection circuit outputs a scan of the low-level voltage VGL to the display panel. Line, the state of the driving thin film transistor is switched.
  • the total value of the circuit is the sum of the current generated by outputting the low voltage VGL and the set value of the current protection.
  • the present application provides an overcurrent protection method, which is implemented based on the overcurrent protection circuit shown in FIG. 1 or FIG. 2.
  • the overcurrent protection method may be a software program in a display device.
  • Stream protection methods including:
  • the current detection circuit obtains a low-order voltage generated by the voltage generation circuit
  • the current detection circuit obtains a first current value corresponding to the low-order voltage according to the low-order voltage
  • the microcontroller calculates a set value of the overcurrent protection corresponding to the scan clock signal according to the total current value of the overcurrent protection circuit and the first current value.
  • FIG. 4 it is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the display device 400 includes a display panel 401 and the above-mentioned overcurrent protection circuit 100.
  • the display panel 201 can be any type of display panel, for example, a liquid crystal display panel based on LCD (Liquid Crystal Display) technology, an organic light emitting diode (OLED) technology based on OLED (Organic Electroluminesence Display) technology, Electromechanical laser display panel, quantum dot light emitting diode display panel or curved display panel based on QLED (Quantum Dot Light Emitting Diodes) technology.
  • LCD Liquid Crystal Display
  • OLED Organic Light emitting diode
  • Electromechanical laser display panel quantum dot light emitting diode display panel or curved display panel based on QLED (Quantum Dot Light Emitting Diodes) technology.

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Abstract

提供了一种过流保护电路及显示装置，过流保护电路(100)包括：电压产生电路（10），电流侦测电路（11），微控制器（12）；电压产生电路（10）的输入端与电源连接，电压产生电路（10）的输出端与电流侦测电路（11）的输入端连接，电流侦测电路（11）的第一输出端与微控制器（12）的第一输入端连接；电压产生电路（10）接入电源并产生低阶电压传输至电流侦测电路（11）；电流侦测电路（11）根据低阶电压生成第一电流值并传输至微控制器（12）；微控制器（12）根据过流保护电路（100）的电流总值和第一电流值，输出与扫描时钟信号对应的过流保护设定值。

Description

一种过流保护电路、过流保护方法及显示装置
本申请要求于2018年08月27日提交中国专利局，申请号为201810979199.5，发明名称为“一种过流保护电路及显示装置”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
本申请涉及过流保护技术领域，尤其涉及一种过流保护电路、过流保护方法及显示装置。
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。薄膜晶体管液晶显示器(Thin Film Transistor-Liquid Crystal Display，TFT-LCD)是目前最常用的显示装置，TFT-LCD的驱动电路包括电源电路(Power Integrated Circuit，Power IC)，时序控制电路(Timer Control Register Integrated Circuit，TCON IC)，扫描驱动电路(Gate Driver Integrated Circuit，Gate Driver IC)。所述电源电路(Power IC)根据系统的数据和信号，生成其它电路工作所需的电压，时序控制电路根据系统的数据和信号，生成扫描驱动电路的工作时序，扫描驱动电路生成高低电平的数字电压，输出到TFT开关的栅极，控制每一行像素的开关。
目前，随着显示装置的边框的越来越窄，新型的无门驱动GDL(Gate driver less)的驱动架构应用越来越广泛，无门驱动电路是将原来的门驱动拆分成升压集成电路(level shifter Integrated Circuit)和移位寄存器(shift register)两部 分，升压集成电路设置在驱动板上，移位寄存器设置在面板上，由升压集成电路输送时钟信号CLK给移位寄存器，完成对扫描线的逐行驱动。
由于上述无门驱动架构的布线以及成产制程的原因，会造成板面内的工作异常，例如电流从TFT开态的高阶电压VGH流向TFT低阶电压VGL(由正性输入电压转为负性输出电压)时，由于板面内的异常，使得在高阶电压VGH与低阶电压VGL之间的阻抗偏低，导致电路中的电流过大，在时钟信号进行高低电平切换时，也会产生电流突变，导致电流信号增大，电流的过大会导致液晶板烧毁；因此在升压集成电路和电源电路(Power IC)都会设置过流保护电路，当输出低阶电压VGL或多个扫描时钟信号时，分别超过电源电路或升呀集成电路设定的保护电流后，相应的电源电路或升压集成电路则关闭输出；但是由于面板内产生的异常情况是多种多样的，有时会发生输出低阶电压信号和多个扫描时钟信号所产生的电流都偏大，但都没有触发各自设定的电流保护值，此时也会存在面板烧毁的几率，从而因无法监测到输出低阶电压产生的电流以及输出多个扫描时钟信号产生的电流同时过大，却没有触发各自的电流保护设定值而导致显示面板烧毁，造成损失。
申请内容
本申请的一个目的在于提供一种过流保护电路，包括但不限于，解决无法监测到输出低阶电压产生的电流与输出多个扫描时钟信号时产生的电流都偏大，而都没有触发各自的电流保护设定值，造成总体电流过大，烧毁显示面板。
本申请实施例采用的技术方案是：本申请实施例提供的一种过流保护电路，包括：电压产生电路，电流侦测电路及微控制器；
所述电压产生电路的输入端与电源连接，所述电压产生电路的输出端与所述电流侦测电路的输入端连接，所述电流侦测电路的第一输出端与所述微控制 器的第一输入端连接；
所述电压产生电路接入电源并产生低阶电压传输至所述电流侦测电路；所述电流侦测电路根据所述低阶电压生成第一电流值并传输至所述微控制器；所述微控制器根据所述过流保护电路的电流总值和所述第一电流值，输出与扫描时钟信号对应的过流保护设定值。
在一个实施例中，所述电流侦测电路侦测输出低阶电压时产生的电流，并将电流转化为数字型的第一电流值，将第一电流值存储并传输至所述微控制器。
在一个实施例中，所述微控制器包含计算器，根据所述电流总值和所述第一电流值计算出与扫描时钟信号对应的过流保护设定值。
在一个实施例中，所述过流保护电路还包括与所述电流侦测电路和所述微控制器连接的串行总线；
所述电流侦测电路通过所述串行总线将所述第一电流值传输至所述微控制器；
所述微控制器通过所述串行总线输出所述过流保护设定值。
在一个实施例中，所述串行总线为包括双向串行数据线和时钟线的双向二线制同步串行总线。
在一个实施例中，所述过流保护电路还包括电平转换器，所述电平转换器包括电压提升电路和过流设定电路；
所述电压提升电路的输出端与所述过流设定电路的第一输入端连接；
所述电压提升电路接入第一时钟信号，根据所述第一时钟信号产生扫描时钟信号，并将所述扫描时钟信号对应的第二电流值传输至所述过流设定电路；所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时 钟信号。
在一个实施例中，所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号，包括：
若扫描时钟信号对应的第二电流值超过所述的过流保护设定值，则启动电流保护，电平转换器不输出相应的扫描时钟信号，停止当前通路的驱动；
若扫描时钟信号对应的第二电流值在所述的过流保护设定值范围内，电平转换器继续输出扫描时钟信号，控制输出相应的高阶或低阶电压，驱动当前通路进行充电或放电。
在一个实施例中，所述微控制器的输出端与所述过流设定电路的第二输入端连接；
所述微控制器通过所述串行总线将所述过流保护设定值传输至所述过流设定电路。
在一个实施例中，所述过流保护设定值等于所述电流总值与所述第一电流值之差。
在一个实施例中，所述过流设定电路的第二输入端通过所述串行总线与所述微控制器的输出端连接，接收所述微控制器输出的所述过流保护设定值；所述过流设定电路根据所述过流保护设定值和所述第二电流值，控制所述电平转换器输出所述扫描时钟信号；
若所述第二电流值小于所述过流保定设定值，则控制所述电平转换器输出所述扫描时钟信号；
若所述第二电流值大于等于所述过流保护设定值，则控制所述电平转换器关闭输出。
在一个实施例中，所述微控制器的第二输入端获取所述过流保护电路的电 流总值，所述电流总值为输出低阶电压产生的电流值与过流保护设定值的总和。
在一个实施例中，所述电流侦测电路的第二输出端输出所述低阶电压至显示面板的扫描线。
在一个实施例中，所述过流保护电路设置在显示装置的电源电路部分。
本申请的另一目的在于提供一种过流保护方法，包括：
电流侦测电路获取由电压产生电路产生低阶电压；
电流侦测电路根据所述低阶电压获取与所述低阶电压对应的第一电流值；
微控制器根据过流保护电路的电流总值和所述第一电流值计算与扫描时钟信号对应的过流保护设定值。
本申请的再一目的在于提供一种显示装置，包括显示面板以及过流保护电路，其中，所述过流保护电路包括电压产生电路，电流侦测电路以及微控制器；
所述电压产生电路的输入端与电源连接，所述电压产生电路的输出端与所述电流侦测电路的输入端连接，所述电流侦测电路的第一输出端与所述微控制器的第一输入端连接；
所述电压产生电路接入电源并产生低阶电压传输至所述电流侦测电路；所述电流侦测电路根据所述低阶电压生成第一电流值并传输至所述微控制器；所述微控制器根据所述过流保护电路的电流总值和所述第一电流值，输出与扫描时钟信号对应的过流保护设定值。
在一个实施例中，所述过流保护电路设置在显示装置的电源电路部分。
在一个实施例中，所述电流侦测电路侦测输出低阶电压时产生的电流，并将电流转化为数字型的第一电流值，将第一电流值存储并传输至所述微控制器。
在一个实施例中，所述微控制器包含计算器，根据所述电流总值和所述第一电流值计算出与扫描时钟信号对应的过流保护设定值。
在一个实施例中，所述过流保护电路还包括电平转换器，所述电平转换器包括电压提升电路和过流设定电路；
所述电压提升电路的输出端与所述过流设定单电路的第一输入端连接；
所述电压提升电路接入第一时钟信号，根据所述第一时钟信号产生扫描时钟信号，并将所述扫描时钟信号对应的第二电流值传输至所述过流设定电路；所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号。
在一个实施例中，所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号，包括：
若扫描时钟信号对应的第二电流值超过所述的过流保护设定值，则启动电流保护，电平转换器不输出相应的扫描时钟信号，停止当前通路的驱动；
若扫描时钟信号对应的第二电流值在所述的过流保护设定值范围内，电平转换器继续输出扫描时钟信号，控制输出相应的高阶或低阶电压，驱动当前通路进行充电或放电。
本申请实施例提供的过流保护电路、过流保护方法及显示装置，通过侦测输出低阶电压时产生的电流值，确定扫描时钟信号对应的过流保护设定值，在低阶电压对应的电流值连续变化的情况，可以更加精准的控制扫描时钟信号对应的过流保护设定值，保护显示面板防止被烧毁。
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是本申请实施例提供的过流保护电流的结构示意图；
图2是本申请实施例提供的过流保护电路的整体实现的结构示意图；
图3是本申请实施例提供的电流计算对照示意图；
图4是本申请实施例提供的显示装置的结构示意图。
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专利的限制，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。
为了说明本申请所述的技术方案，以下结合具体附图及实施例进行详细说 明。
如图1所示，本申请实施例提供过流保护电流的结构示意图，为了便于说明，仅示出了与本申请实施例相关的部分。
如图所示的过流保护电路应用于显示装置，所述过流保护电路设置在显示装置的电源电路部分，电源电路通过系统接口输入电压可以生成五种工作电压，其中包括扫面线上用于打开晶体管TFT的最大开态电压VGH；以及扫描线上控制薄膜晶体管TFT状态切换的低阶电压VGL，低阶电压VGL可取值-5V，最高可达-40V。
所述的过流保护电路包括电压产生电路10，电流侦测电路11，微控制器12；
电压产生电路10的输入端与电源连接，所述电压产生电路10的输出端与所述电流侦测电路11的输入端连接，所述电流侦测电路11的第一输出端与所述微控制器12的第一输入端连接；
所述电压产生电路10接入电源并产生低阶电压传输至所述电流侦测电路11；所述电流侦测电路11根据所述低阶电压生成第一电流值并传输至所述微控制器12，其中，所述电流侦测电路侦测输出低阶电压时产生的电流，并将电流转化为数字型的第一电流值，将第一电流值存储并传输至所述微控制器；所述微控制器12根据所述过流保护电路的电流总值和第一电流值，输出与扫描时钟信号对应的过流保护设定值，微控制器12包含计算器，可以根据电流总值和第一电流值计算出与扫描时钟信号对应的过流保护设定值。
其中，第一电流为在输出低阶电压VGL时，产生的电流值；在本实施例中，不设定低阶电压VGL对应的过流保护设定值，只是对输出低阶电压VGL时产生的电流进行侦测。所述的电流总值为当前保护电路测得电源驱动电路总 的电流值，包括输出低阶电压时产生的电流值以及输出时钟信号或时钟信号发生跳变时产生的电流值，所述总的电流值在一段时间内可以是一个定值，也可以是根据电路工作状态变化而变动的电流总值。所述的扫描时钟信号为输出至移位寄存器可以直接驱动对应扫面线通路充电或放电的时钟信号，例如，若显示面板为液晶显示面板，则输出可以打开或关闭液晶显示器的薄膜晶体管TFT的扫描时钟信号。在扫描时钟信号由低电平变换至高电平时，电路中会产生正向的电流突变，从而使电路中的电流增大。另外，每一通路的扫描线上对应一个低阶电压信号以及多个时钟信号，每一个时钟信号对应的电流比输出低阶电压产生的电流小很多，因此通过侦测低阶电压输出的电流，控制每一通路的多个时钟信号的电流值，可以更精准、简便的启动电源驱动电路的过流保护，从而达到保护显示面板的目的。
在具体应用中，显示面板包括由多行和多列子像素组成的像素阵列，行子像素与源极驱动模块连接，列子像素与栅极驱动模块连接，像素阵列的行数和列数可以根据具体需要进行设定；源极驱动模块可以是任意的具有对显示面板的像素进行数据驱动功能的任意器件或电路，例如，源极驱动芯片(Source Driver IC)或薄膜源极驱动芯片(S-COF，Source-Chip on Film)等；栅极驱动模块可以是任意的具有对显示面板的像素进行扫描充电功能的任意器件或电路，例如，栅极驱动芯片(Gate Driver IC)或薄膜栅极驱动芯片(G-COF，Gate-Chip on Film)等。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，仅以上述各功能电路的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能器件完成，以完成以上描述的全部或者部分功能。可以参考前述方法实施例中的处理方式，在此不再赘述。
如图2所示，是本申请实施例提供的过流保护电路的整体实现的结构示意图，为了便于说明，仅示出了与本申请实施例相关的部分。
如图所示过流保护电路包括电压产生电路10，电流侦测电路11，微控制器12；还包括与电流侦测电路11和微控制器12连接的串行总线20；电流侦测电路11通过所述串行总线20将第一电流值传输至微控制器12；微控制器12通过串行总线20输出与扫描信号对应的过流保护设定值。其中，微控制器根据获取的电流总值与第一电流值，确定需要输出的与扫描时钟信号对应的过流保护设定值。
在一个实施例中，过流保护电路还包括电平转换器21，电平转换器包括电压提升电路211和过流设定电路212；电压提升电路211的输出端与过流设定电路212的第一输入端连接；电压提升电路211接入第一时钟信号，根据所述第一时钟信号产生扫描时钟信号，并将扫描时钟信号对应的第二电流值传输至过流设定电路212；过流设定电路212根据所述第二电流值，控制电平转换器输出扫描时钟信号。若扫描时钟信号对应的第二电流值超过所述的过流保护设定值，则启动电流保护，电平转换器不输出相应的扫描时钟信号，停止当前通路的驱动；若扫描时钟信号对应的第二电流值在所述的过流保护设定值范围内，电平转换器继续输出扫描时钟信号，控制输出相应的高阶或低阶电压，驱动当前通路进行充电或放电。
其中，扫描时钟信号可以是垂直时钟信号，由垂直时钟信号控制移位寄存器输出逻辑信号的时间，所输出的逻辑信号用于产生对应通路的高阶电压VGH以及低阶电压VGL。
另外，电平转换器用于将低电压的逻辑电平VDD/VSS转换成高幅值的电压VGH/VGL，通过电平转换器的升压动作实现。电平转换器是扫描驱动电路 的关键部分，在电平转换器中，首先会把低电压的逻辑电平信号降到整个集成电路的低阶电压VGL，然后再提升到高阶电压VGH；而电平转换器输出的是与高阶电压和低阶电压对应的数字信号，例如，时钟信号。
在一个实施例中，微控制器12的输出端与过流设定电路212的第二输入端连接；微控制器12通过所述串行总线20将过流保护设定值传输至过流设定电路212，通过微控制器12实时传输的过流保护设定值改变过流设定电路212的过流设定值，从而实现VGL的电流与扫描时钟信号的电流的联动，当VGL的电流过大时，电平转换器的过流设定值会相应变小，电平转换器就会更容易启动过流保护，从而可以关闭输出，达到保护显示面板的目的。
在一个实施例中，串行总线20为包括双向串行数据线和时钟线的双向二线制同步串行总线I2C。所述串行总线也可以是其它通用串行总线。
在一个实施例中，过流保护设定值等于电流总值与所述第一电流值之差。如图3所示的本申请实施例提供电流计算对照表，若在一定时间段内的电流总值△为250mA，当VGL电压产生的电流为200mA时，则设定电平转换器的过流保护设定值为50mA；当VGL电压产生的电流为170mA时，则设定电平转换器的过流保护设定值为80mA；本申请实施例提供的过流保护电路控制的电流的大小变化时连续的，在电流总值第一定的情况下，VGL的电流连续变化，电平转换器的过流设定值也是连续变化的，从而实现更精准的过流保护。
在一个实施例中，过流设定电路212的第二输入端通过串行总线I2C与微控制器12的输出端连接，接收微控制器输出的过流保护设定值；过流设定电路212根据过流保护设定值和第二电流值，控制电平转换器输出扫描时钟信号。
若第二电流值小于过流保定设定值，则控制电平转换器输出扫描时钟信 号；
若第二电流值大于等于过流保护设定值，则控制所述电平转换器关闭输出；在电平转换器关闭输出时，则不会输出低阶电压VGL的对应的数字信号，显示面板的驱动电路中也就不会输出低阶电压，则不会驱动薄膜晶体管的状态切换。
其中，当显示面板内部存在一些异常时，可能造成液晶显示屏的正电输入引脚与液晶显示屏的负电输入引脚之间的阻抗偏低，从而使输出电压时，产生的电流过大；当输出电压产生的电流由170mA变化为200mA时，电平转换器的过流设定值则从80mA相应减小至50mA；若在电平转换器的时钟信号产生的电流超过当前的过流设定值时，则启动过流保护，关闭输出时钟信号，停止驱动显示面板，从而保护显示面板，防止被烧毁。
在一个实施例中，所述微控制器的第二输入端接收所述过流保护电路的电流总值，所述电流总值为输出低阶电压产生的电流值与过流保护设定值的总和。
在一个实施例中，若第二电流值小于过流保定设定值，则控制电平转换器输出扫描时钟信号，同时电流侦测电路的第二输出端输出低阶电压VGL至显示面板的扫描线，驱动薄膜晶体管的状态切换。
需要说明的是，电路总值为输出低价电压VGL所产生的电流与电流保护的设定值的总和。
在一个实施例中，本申请提供一种过流保护方法，基于图1或图2所示的过流保护电路实现，所述过流保护方法可以是显示装置中的软件程序，所述的过流保护方法，包括：
电流侦测电路获取由电压产生电路产生低阶电压；
电流侦测电路根据所述低阶电压获取与所述低阶电压对应的第一电流值；
微控制器根据过流保护电路的电流总值和所述第一电流值计算与扫描时钟信号对应的过流保护设定值。
如图4所示，是本申请实施例提供的显示装置的结构示意图，所述显示装置400，包括显示面板401以及上述的过流保护电路100。
在一个实施例中，显示面板201可以为任意类型的显示面板，例如基于LCD(Liquid Crystal Display，液晶显示装置)技术的液晶显示面板、基于OLED(Organic Electroluminesence Display，有机电激光显示)技术的有机电激光显示面板、基于QLED(Quantum Dot Light Emitting Diodes，量子点发光二极管)技术的量子点发光二极管显示面板或曲面显示面板等。
以上仅为本申请的可选实施例而已，并不用于限制本申请。对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的权利要求范围之内。

Claims (20)

  1. 一种过流保护电路，应用于显示装置，所述过流保护电路包括电压产生电路，电流侦测电路以及微控制器；
    所述电压产生电路的输入端与电源连接，所述电压产生电路的输出端与所述电流侦测电路的输入端连接，所述电流侦测电路的第一输出端与所述微控制器的第一输入端连接；
    所述电压产生电路接入电源并产生低阶电压传输至所述电流侦测电路；所述电流侦测电路根据所述低阶电压生成第一电流值并传输至所述微控制器；所述微控制器根据所述过流保护电路的电流总值和所述第一电流值，输出与扫描时钟信号对应的过流保护设定值。
  2. 根据权利要求1所述的过流保护电路，其中，所述电流侦测电路侦测输出低阶电压时产生的电流，并将电流转化为数字型的第一电流值，将第一电流值存储并传输至所述微控制器。
  3. 根据权利要求1所述的过流保护电路，其中，所述微控制器包含计算器，根据所述电流总值和所述第一电流值计算出与扫描时钟信号对应的过流保护设定值。
  4. 根据权利要求1所述的过流保护电路，其中，还包括所述电流侦测电路和所述微控制器连接的串行总线；
    所述电流侦测电路通过所述串行总线将所述第一电流值传输至所述微控制器；
    所述微控制器通过所述串行总线输出所述过流保护设定值。
  5. 根据权利要求4所述的过流保护电路，其中，所述串行总线为包括双向串行数据线和时钟线的双向二线制同步串行总线。
  6. 根据权利要求1所述的过流保护电路，其中，所述过流保护电路还包括电平转换器，所述电平转换器包括电压提升电路和过流设定电路；
    所述电压提升电路的输出端与所述过流设定电路的第一输入端连接；
    所述电压提升电路接入第一时钟信号，根据所述第一时钟信号产生扫描时钟信号，并将所述扫描时钟信号对应的第二电流值传输至所述过流设定电路；所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号。
  7. 根据权利要求6所述的过流保护电路，其中，所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号，包括：
    若扫描时钟信号对应的第二电流值超过所述的过流保护设定值，则启动电流保护，电平转换器不输出相应的扫描时钟信号，停止当前通路的驱动；
    若扫描时钟信号对应的第二电流值在所述的过流保护设定值范围内，电平转换器继续输出扫描时钟信号，控制输出相应的高阶或低阶电压，驱动当前通路进行充电或放电。
  8. 根据权利要求6所述的过流保护电路，其中，所述微控制器的输出端与所述过流设定电路的第二输入端连接；
    所述微控制器通过所述串行总线将所述过流保护设定值传输至所述过流设定电路。
  9. 根据权利要求8所述的过流保护电路，其中，所述过流保护设定值等于所述电流总值与所述第一电流值之差。
  10. 根据权利要求8所述的过流保护电路，其中，所述过流设定电路的第二输入端通过所述串行总线与所述微控制器的输出端连接，接收所述微控制器输出的所述过流保护定值；所述过流设定电路根据所述过流保护设定值和所述 第二电流值，控制所述电平转换器输出所述扫描时钟信号；
    若所述第二电流值小于所述过流保定设定值，则控制所述电平转换器输出所述扫描时钟信号；
    若所述第二电流值大于等于所述过流保护定值，则控制所述电平转换器关闭输出。
  11. 根据权利要求1所述的过流保护电路，其中，所述微控制器的第二输入端接收所述过流保护电路的电流总值，所述电流总值为输出低阶电压产生的电流值与过流保护设定值的总和。
  12. 根据权利要求1所述的过流保护电路，其中，所述电流侦测电路的第二输出端输出所述低阶电压至显示面板的扫描线。
  13. 根据权利要求1所述的过流保护电路，其中，所述过流保护电路设置在显示装置的电源电路部分。
  14. 一种过流保护方法，其中，
    电流侦测电路获取由电压产生电路产生低阶电压；
    电流侦测电路根据所述低阶电压获取与所述低阶电压对应的第一电流值；
    微控制器根据过流保护电路的电流总值和所述第一电流值计算与扫描时钟信号对应的过流保护设定值。
  15. 一种显示装置，包括显示面板以及过流保护电路，其中，所述过流保护电路包括电压产生电路，电流侦测电路以及微控制器；
    所述电压产生电路的输入端与电源连接，所述电压产生电路的输出端与所述电流侦测电路的输入端连接，所述电流侦测电路的第一输出端与所述微控制器的第一输入端连接；
    所述电压产生电路接入电源并产生低阶电压传输至所述电流侦测电路；所 述电流侦测电路根据所述低阶电压生成第一电流值并传输至所述微控制器；所述微控制器根据所述过流保护电路的电流总值和所述第一电流值，输出与扫描时钟信号对应的过流保护设定值。
  16. 根据权利要求15所述的显示装置，其中，所述过流保护电路设置在显示装置的电源电路部分。
  17. 根据权利要求15所述的显示装置，其中，所述电流侦测电路侦测输出低阶电压时产生的电流，并将电流转化为数字型的第一电流值，将第一电流值存储并传输至所述微控制器。
  18. 根据权利要求15所述的显示装置，其中，所述微控制器包含计算器，根据所述电流总值和所述第一电流值计算出与扫描时钟信号对应的过流保护设定值。
  19. 根据权利要求15所述的显示装置，其中，所述过流保护电路还包括电平转换器，所述电平转换器包括电压提升电路和过流设定电路；
    所述电压提升电路的输出端与所述过流设定电路的第一输入端连接；
    所述电压提升电路接入第一时钟信号，根据所述第一时钟信号产生扫描时钟信号，并将所述扫描时钟信号对应的第二电流值传输至所述过流设定电路；所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号。
  20. 根据权利要求19所述的显示装置，其中，所述过流设定电路根据所述第二电流值，控制所述电平转换器输出所述扫描时钟信号，包括：
    若扫描时钟信号对应的第二电流值超过所述的过流保护设定值，则启动电流保护，电平转换器不输出相应的扫描时钟信号，停止当前通路的驱动；
    若扫描时钟信号对应的第二电流值在所述的过流保护设定值范围内，电平 转换器继续输出扫描时钟信号，控制输出相应的高阶或低阶电压，驱动当前通路进行充电或放电。
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