WO2020133578A1 - Overcurrent protection system and method, and display device - Google Patents

Overcurrent protection system and method, and display device Download PDF

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Publication number
WO2020133578A1
WO2020133578A1 PCT/CN2019/071070 CN2019071070W WO2020133578A1 WO 2020133578 A1 WO2020133578 A1 WO 2020133578A1 CN 2019071070 W CN2019071070 W CN 2019071070W WO 2020133578 A1 WO2020133578 A1 WO 2020133578A1
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WIPO (PCT)
Prior art keywords
current
value
circuit
overcurrent protection
output terminal
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PCT/CN2019/071070
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French (fr)
Chinese (zh)
Inventor
胡水秀
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惠科股份有限公司
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Publication of WO2020133578A1 publication Critical patent/WO2020133578A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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

Definitions

  • the present application relates to the field of display technology, in particular to an overcurrent protection system, method and display device.
  • the display panel is usually driven by the output drive signal of the output terminal of the GOA (gate on array) circuit.
  • the current solution usually sets a current protection threshold in the GOA circuit. When the drive current output at the output terminal is greater than the current protection threshold, the current protection function is activated.
  • the current boost integrated circuit has a current protection threshold set to a fixed value and a large value. If the display panel generates heat due to a slight short circuit, the GOA circuit cannot protect the display panel.
  • Various embodiments according to the present application provide an overcurrent protection system, method, and display device.
  • the overcurrent protection system includes:
  • Storage circuit set to store preset current effective value and corresponding current protection value
  • the detection circuit is connected to the output terminal and is configured to detect the drive current output by the output terminal;
  • a calculation circuit connected to the detection circuit, and configured to calculate an actual current effective value based on the drive current
  • a search circuit is respectively connected to the calculation circuit and the storage circuit, and is configured to compare the actual current effective value with the preset current effective value, and search for the corresponding current protection value according to the comparison result, so as to compare The current protection value is set as the current protection threshold.
  • it further includes a main control circuit, which is respectively connected to the detection circuit and the search circuit, and is configured to determine whether the driving current is greater than the current protection threshold; the main control The circuit is further configured to control the output terminal to stop outputting the drive current when the drive current is greater than the current protection threshold.
  • it further includes a conversion circuit, which is respectively connected to the input terminal, the detection circuit and the main control circuit, and is configured to receive the input terminal according to the control of the main control circuit
  • the low potential signal is converted into a high potential signal and output through the output terminal.
  • the low-level signal is a digital signal.
  • the high-potential signal is an analog voltage signal.
  • the detection circuit includes a current sensor connected in series with the output terminal, and configured to detect the drive current output by the output terminal.
  • the detection circuit includes a resistance and a calculation element; the resistance is connected in series with the output terminal, the calculation element is connected to both ends of the resistance; the calculation element is configured to detect the resistance The voltage at both ends, and the driving current output by the output end is calculated according to the voltage at both ends of the resistor.
  • the preset current effective value and the current protection value are stored in the storage circuit in the form of a table.
  • the preset effective current value and the current protection value change in a positive correlation.
  • An overcurrent protection method includes:
  • the overcurrent protection method further includes:
  • the output terminal is controlled to stop outputting the driving current.
  • the overcurrent protection method further includes converting the received low-potential signal into a high-potential signal and outputting it through the output terminal.
  • the preset current effective value and the current protection value are stored in the form of a table.
  • the preset effective current value and the current protection value change in a positive correlation.
  • a display device includes a display panel and a driving module.
  • the display panel includes a display area and a non-display area.
  • the display area is provided with a plurality of data lines, a plurality of scanning lines, and a plurality of pixel units arranged in an array.
  • the drive module includes the above-mentioned overcurrent protection system.
  • the pixel unit is electrically connected to the data line and the gate line, respectively.
  • the driving module further includes a timing controller and a source driving unit, the source driving unit is electrically connected to the data line, and the timing controller provides the data signal to the data line through the source driving unit And control signals.
  • the driving module further includes a gate driving unit, and the timing controller provides a driving signal and a control signal for the gate line through the gate driving unit.
  • it further includes a printed circuit board, and the timing controller and the overcurrent protection system are all provided on the printed circuit board.
  • FIG. 1 is a schematic block diagram of an overcurrent protection system provided by an embodiment
  • FIG. 2 is a schematic block diagram of an overcurrent protection system provided by another embodiment
  • FIG. 3 is a circuit diagram of a conversion circuit provided by an embodiment
  • FIG. 4 is a waveform diagram of a low potential signal and a high potential signal provided by an embodiment
  • FIG. 5 is a schematic structural diagram of a display device provided by an embodiment
  • FIG. 6 is a flowchart of an overcurrent protection method provided by an embodiment.
  • FIG. 1 is a functional block diagram of an overcurrent protection system provided by this application.
  • the overcurrent protection system is applied to a boost integrated circuit that charges a display panel.
  • the overcurrent protection system includes a storage circuit 10, a detection circuit 20, a calculation circuit 30, and a search circuit 40.
  • the storage circuit 10 is used to store a preset current effective value and a corresponding current protection value.
  • the current protection value is the maximum allowable drive current value of the display panel. If the drive current of the display panel is greater than the current protection value, the display panel may be damaged.
  • the preset effective current value is the effective current value stored in the storage circuit 10 corresponding to the current protection value.
  • the preset current effective value and the current protection value are both multiple and correspond to each other.
  • the preset current effective value and the current protection value change in a positive correlation.
  • the preset effective current value and the current protection value are stored in the storage circuit 10 in the form of a table.
  • the detection circuit 20 is connected to the output terminal VOUT.
  • the detection circuit 20 is used to detect the drive current output by the output terminal VOUT.
  • the output terminal VOUT is used to output a high potential signal to the shift register of the display panel, and the high potential signal is used to drive the display panel.
  • the high potential signal is an analog voltage signal.
  • the detection circuit 20 may include a resistor 21 and a calculation element 22.
  • the resistor 21 is connected in series with the output terminal VOUT, and the computing element 22 is connected to both ends of the resistor 21.
  • the calculating element 22 is used for detecting the voltage across the resistor 21 and calculating the current of the resistor 21 according to the voltage across the resistor 21, the current of the resistor 21 being the driving current output by the output terminal VOUT.
  • the detection circuit 20 may include a current sensor 23 that is connected in series with the output terminal VOUT to detect the drive current output by the output terminal VOUT.
  • the current sensor 23 is used to detect the drive current output by the output terminal VOUT, which is convenient for detection and fast in response.
  • the calculation circuit 30 is connected to the detection circuit 20.
  • the calculation circuit 30 is used for calculating an actual current effective value according to the driving current.
  • the search circuit 40 is connected to the calculation circuit 30 and the storage circuit 10 respectively.
  • the search circuit 40 is used for comparing the actual current effective value with the preset current effective value, and searching for the corresponding current protection value according to the comparison result, so as to set the current protection value as the current protection threshold.
  • the current protection threshold is the maximum allowable driving current value of the display panel.
  • the storage circuit 10 stores N preset current effective values and N current protection values, the N preset current effective values are RMS1, RMS2, ..., RMS N-1, RMS N,
  • the current protection value corresponding to the preset current effective value RMS1 is OCP1
  • the current protection value corresponding to the preset current effective value RMS2 is OCP2,...
  • the current protection value corresponding to the preset current effective value RMSN-1 corresponds to OCP N-1
  • the effective value of the actual current is RMS.
  • RMS ⁇ RMS1 find the current protection value OCP1 corresponding to the preset current effective value RMS1, and set the current protection value to OCP1 as the current protection threshold; if RMS1 ⁇ RMS ⁇ RMS2, then find the corresponding current effective value RMS2 Current protection value OCP2, and set the current protection value OCP2 as the current protection threshold; and so on, if RMS N-1 ⁇ RMS ⁇ RMSN, then find the current protection value OCPN corresponding to the preset current effective value RMSN, and Set the current protection value to OCPN as the current protection threshold. In this way, the current protection threshold of the display panel can be dynamically set.
  • the overcurrent protection system also includes a main control circuit 50.
  • the main control circuit 50 is respectively connected to the detection circuit 20 and the search circuit 40, and is used to determine whether the driving current is greater than the current protection threshold.
  • the main control circuit 50 is also used to control the output terminal VOUT to stop outputting the drive current when the drive current is greater than the current protection threshold.
  • the driving current is a current driving the display panel to work.
  • the boost integrated circuit stops working, so that the display panel stops working, avoiding excessive driving current of the display panel, causing excessive heat generation of the display panel, and causing burn-in of the display panel .
  • the overcurrent protection system also includes a conversion circuit 60.
  • the conversion circuit 60 is connected to the input terminal VIN, the detection circuit 20 and the main control circuit 50 respectively.
  • the conversion circuit 60 is used to convert the low potential signal received by the input terminal VIN into a high potential signal according to the control of the main control circuit 50 and output it through the output terminal VOUT.
  • the low potential signal is a digital signal.
  • the conversion circuit 60 includes a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3, a fourth electronic switch Q4, a fifth electronic switch Q5, a sixth electronic switch Q6, a seventh electronic Switch Q7 and the eighth electronic switch Q8.
  • the first terminal of the first electronic switch Q1 receives the low potential signal A
  • the second terminal of the first electronic switch Q1 is connected to the first power supply VDD
  • the third terminal of the first electronic switch Q1 is connected to the first The first end of the four electronic switches Q4 is connected.
  • the first end of the second electronic switch Q2 receives the inverted signal of the low potential signal A
  • the second end of the second electronic switch Q2 is connected to the second end of the first electronic switch Q1, and the third end of the second electronic switch Q2 is connected to the first end of the third electronic switch Q3.
  • the second end of the third electronic switch Q3 is connected to the second end of the fourth electronic switch Q4 and the second power supply VGL, and the third end of the third electronic switch Q3 is also connected to the first electronic switch Q1 The third end of the connection.
  • the third terminal of the fourth electronic switch Q4 is also connected to the third terminal of the second electronic switch Q2.
  • the second end of the fifth electronic switch Q5 is connected to the third power supply VGH, and the third end of the fifth electronic switch Q5 is connected to the first end of the sixth electronic switch Q6.
  • the second end of the sixth electronic switch Q6 is connected to the second end of the fifth electronic switch Q5, and the third end of the sixth electronic switch Q6 is connected to the first end of the fifth electronic switch Q5.
  • the first end of the seventh electronic switch Q7 is connected to the third end of the second electronic switch Q2, the second end of the seventh electronic switch Q7 is connected to the second power supply VGL, and the seventh electronic switch Q7
  • the third end of is connected to the first end of the sixth electronic switch Q6.
  • the first end of the eighth electronic switch Q8 is connected to the third end of the first electronic switch Q1, and the second end of the eighth electronic switch Q8 is connected to the second end of the seventh electronic switch Q7,
  • the third terminal of the eighth electronic switch Q8 is connected to the third terminal of the sixth electronic switch Q6.
  • the signal at the first end of the third electronic switch Q3 and the signal at the first end of the fourth electronic switch Q4 are mutually inverse signals, that is, the signal at the first end of the seventh electronic switch Q7 and the signal
  • the signals at the first terminal of the eighth electronic switch Q8 are inverted signals. As shown in FIG.
  • the signals at the first terminal of the third electronic switch Q3 and the signals at the first terminal of the seventh electronic switch Q7 Is B, the signal at the first end of the fourth electronic switch Q4 and the signal at the first end of the eighth electronic switch Q8 are The third terminal of the sixth electronic switch Q6 outputs a high potential signal C.
  • the working principle of the conversion circuit 60 is as follows:
  • the low-potential signal A includes a low level and a high level in one cycle.
  • the first power supply VDD is a positive voltage DC power supply and the voltage is the absolute value of the high level of the low potential signal A.
  • the second power supply VGL is a negative voltage DC power supply and the absolute value of the voltage is greater than the absolute value of the low level of the low potential signal A.
  • the third power supply VGH is a positive voltage DC power supply and the voltage is greater than the voltage of the first power supply VDD.
  • the first electronic switch Q1 When the low potential signal A is at a high level, the inverted signal of the low potential signal A Low level, the first electronic switch Q1 is turned off, the second electronic switch Q2 is turned on, the third electronic switch Q3 is turned on, the seventh electronic switch Q7 is turned on, and the fourth electronic switch Q4 and the eighth electronic switch Q8 are turned off, because the seventh electronic switch Q7 is turned on, and thus the sixth electronic switch Q6 is turned on, the third terminal of the sixth electronic switch Q6 and the third power supply VGH is turned on, the third terminal of the sixth electronic switch Q6 outputs a high level and the voltage is the voltage of the third power supply VGH.
  • the inverted signal of the low potential signal A Is high, the first electronic switch Q1 is turned on, the second electronic switch Q2 is turned off, the third electronic switch Q3 is turned off, the seventh electronic switch Q7 is turned off, the fourth electronic switch Q4 and The eighth electronic switch Q8 is turned on, and because the eighth electronic switch Q8 is turned on, the third terminal of the sixth electronic switch Q6 is connected to the second power supply VGL, and the sixth terminal of the sixth electronic switch Q6 The three terminals output a low level and the voltage is the voltage of the second power supply VGL.
  • the conversion circuit 60 converts the input low potential signal A with a lower absolute potential value into a high potential signal C with a higher absolute potential value for output.
  • the sixth electronic switch Q6 The high level of the high potential signal C output from the third terminal is the third power supply VGH, and the low level is the second power supply VGL.
  • the conversion circuit 60 converts a low-potential signal with a low absolute value of the potential into a high-potential signal with a high absolute value of the potential, so that the high-potential signal can drive the display panel with a sufficient voltage.
  • the present application also provides a display device 10, which includes a display panel 100, a driving module 200, and a printed circuit board 300.
  • the display panel 100 includes a display area 110 and a non-display area 120.
  • the display area 110 is an area in which image information is displayed, and may also be referred to as an active area.
  • a plurality of data lines 111 and a plurality of gate lines 112 are provided in the display area 110.
  • the plurality of data lines 111 extend in the first direction and are arranged in the second direction.
  • the gate lines 112 are also called scanning lines, and a plurality of gate lines 112 extend along the second direction and are arranged along the first direction.
  • the extending and arranging directions of the gate line 112 and the data line 111 are opposite, that is, the extending direction of the data line 111 is the arranging direction of the gate line 112, and the arranging direction of the data line 111 is the extending direction of the gate line 112.
  • the first direction and the second direction are perpendicular to each other, please refer to FIG. 2, the first direction can be understood as a vertical direction, that is, the extension direction of the Y axis in two-dimensional coordinates, the second direction can be understood as a horizontal direction, that is, two The extension direction of the X axis in dimensional coordinates.
  • the display area 110 is also provided with a plurality of pixel units 113 arranged in an array.
  • the pixel units 113 are electrically connected to the data lines 111 and the gate lines 112, respectively.
  • the non-display area 120 generally refers to an area where no image is displayed, and this part of the area is mainly used to press some circuits and some sensors in this area.
  • the display panel 100 may be, for example, a TFT-LCD (Thin Film Transistor Liquid Crystal Display) display panel, an OLED (Organic Light-Emitting Diode) display panel, and a QLED (Quantum Dot Light Emitting Diodes, quantum dot light-emitting diodes) display panels, curved display panels or other display panels.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • OLED Organic Light-Emitting Diode
  • QLED Quantum Dot Light Emitting Diodes, quantum dot light-emitting diodes
  • the driving module 200 may include a timing controller 210, a source driving unit 220, a gate driving unit 230, and the overcurrent protection system 240 described above.
  • the source driving unit 220 is electrically connected to the data line 111
  • the gate driving unit 230 is electrically connected to the gate line 112.
  • the timing controller 210 is used to transmit signals to the source driving unit 220 and the gate driving unit 230.
  • the timing controller 210 is mainly used to process the R (Red, Red)/G (Green, Green)/B (Blue, Blue) compressed signals, control signals, and power signals transmitted by the system motherboard through the source
  • the driving unit 220 provides the data signal and the control signal for the data line 111 and the driving signal and the control signal for the gate line 112 through the gate driving unit 230, thereby enabling the pixel unit 113 to perform normal display.
  • the printed circuit board 300 is abbreviated as PCB (Printed Circuit Board).
  • the timing controller 210 and the overcurrent protection system 240 are both provided on the printed circuit board 300.
  • the printed circuit board 300 is an important electronic component, a support for electronic components, and a carrier for electrical connection of electronic components.
  • the above overcurrent protection system and display device calculate the actual current effective value by detecting the driving current output from the output terminal, and also compare the actual current effective value with the stored preset current effective value, and find the corresponding current protection according to the comparison result Value to set the current protection value as the current protection threshold, so that the current protection threshold of the display panel can be dynamically and reasonably set, and effective protection of the display panel can be achieved.
  • FIG. 1 is only an illustration, and the overcurrent protection system may further include more or fewer components than those shown in FIG. 1 or have a configuration different from that shown in FIG. 1.
  • Each component shown in FIG. 1 may be implemented by hardware, software, or a combination thereof.
  • FIG. 5 is a flowchart of an overcurrent protection method provided by a preferred embodiment of the present application. It should be noted that the method of the present application is not limited to the order of the following steps, and in other embodiments, the method of the present application may include only some of the following steps, or some of the steps may be deleted. In addition, in other embodiments, one step may be split into multiple steps, or multiple steps may also be combined into one step.
  • Step S1 storing the preset current effective value and the corresponding current protection value.
  • step S2 the driving current output by the output terminal is detected.
  • Step S3 Calculate the actual effective current value according to the driving current.
  • Step S4 Compare the actual current effective value with the preset current effective value, and search for the corresponding current protection value according to the comparison result, so as to set the current protection value as the current protection threshold.
  • the overcurrent protection method further includes the following steps:
  • Step S5 Determine whether the driving current is greater than the current protection threshold.
  • Step S6 When the driving current is greater than the current protection threshold, the output terminal is controlled to stop outputting the driving current.
  • a unit may be, but is not limited to, a process running on a processor, a processor, an object, executable code, a thread of execution, a program, and/or a computer.
  • a unit may be, but is not limited to, a process running on a processor, a processor, an object, executable code, a thread of execution, a program, and/or a computer.
  • the application running on the server and the server can be units.
  • One or more units may reside in a process and/or a thread of execution, and a unit may be located in one computer and/or distributed between two or more computers.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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  • Theoretical Computer Science (AREA)
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Abstract

The present application relates to an overcurrent protection system, comprising a storage circuit, a detection circuit, a calculation circuit, and a search circuit. The storage circuit is used for storing a preset current effective value and a corresponding current protection value. The detection module is used for detecting the driving current output by the output end. The calculation circuit is used for calculating an actual current effective value according to the driving current. The search circuit is used for comparing the actual current effective value with the preset current effective value, and searching, according to the comparison result, for a corresponding current protection value in order to set the current protection value as a current protection threshold.

Description

过流保护***、方法及显示装置Overcurrent protection system, method and display device
本申请要求于2018年12月27日提交中国专利局、申请号为2018116122153、申请名称为“过流保护***、方法及显示装置”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。This application requires the priority of the Chinese patent application filed on December 27, 2018 in the Chinese Patent Office with the application number 2018116122153 and the application name "Overcurrent Protection System, Method and Display Device", the entire contents of which are incorporated by reference in this document Applying.
技术领域Technical field
本申请涉及显示技术领域，特别涉及一种过流保护***、方法及显示装置。The present application relates to the field of display technology, in particular to an overcurrent protection system, method and display device.
背景技术Background technique
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。The statements here only provide background information related to the present application and do not necessarily constitute prior art.
显示面板通常由GOA(gate on array，栅阵列)电路的输出端输出驱动信号驱动。为防止显示面板在工作过程中出现过流而引起烧屏，现有的方案通常在GOA电路中设置电流保护阈值，当输出端输出的驱动电流大于电流保护阈值时，启动电流保护功能。不同的显示面板对支路的负载不一样，因此，显示面板的驱动电流需求也不同。现有的升压集成电路为了兼容不同的显示面板，电流保护阈值设置为固定值且数值较大，若显示面板由于轻微短路引起热量累积，则GOA电路无法实现对显示面板的保护。The display panel is usually driven by the output drive signal of the output terminal of the GOA (gate on array) circuit. In order to prevent the display panel from overburning during the working process and causing screen burn-in, the current solution usually sets a current protection threshold in the GOA circuit. When the drive current output at the output terminal is greater than the current protection threshold, the current protection function is activated. Different display panels have different loads on the branches, so the drive current requirements of the display panels are also different. In order to be compatible with different display panels, the current boost integrated circuit has a current protection threshold set to a fixed value and a large value. If the display panel generates heat due to a slight short circuit, the GOA circuit cannot protect the display panel.
发明内容Summary of the invention
根据本申请的各种实施例提供一种过流保护***、方法及显示装置。Various embodiments according to the present application provide an overcurrent protection system, method, and display device.
一种过流保护***，所述过流保护***包括：An overcurrent protection system. The overcurrent protection system includes:
存储电路，设置为存储预设电流有效值与对应的电流保护值；Storage circuit, set to store preset current effective value and corresponding current protection value;
检测电路，与输出端连接，设置为检测所述输出端输出的驱动电流；The detection circuit is connected to the output terminal and is configured to detect the drive current output by the output terminal;
计算电路，与所述检测电路连接，设置为根据所述驱动电流计算实际电流有效值；及A calculation circuit, connected to the detection circuit, and configured to calculate an actual current effective value based on the drive current; and
查找电路，分别与所述计算电路及所述存储电路连接，设置为将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。A search circuit is respectively connected to the calculation circuit and the storage circuit, and is configured to compare the actual current effective value with the preset current effective value, and search for the corresponding current protection value according to the comparison result, so as to compare The current protection value is set as the current protection threshold.
在其中一个实施例中，还包括主控电路，所述主控电路分别与所述检测电路及所述查找电路连接，设置为判断所述驱动电流是否大于所述电流保护阈值；所述主控电路还设置为当所述驱动电流大于所述电流保护阈值时，控制所述输出端停止输出驱动电流。In one of the embodiments, it further includes a main control circuit, which is respectively connected to the detection circuit and the search circuit, and is configured to determine whether the driving current is greater than the current protection threshold; the main control The circuit is further configured to control the output terminal to stop outputting the drive current when the drive current is greater than the current protection threshold.
在其中一个实施例中，还包括转换电路，所述转换电路分别与输入端、所述检测电路及所述主控电路连接，设置为根据所述主控电路的控制将所述输入端接收的低电位信号转换成高电位信号并通过所述输出端输出。In one of the embodiments, it further includes a conversion circuit, which is respectively connected to the input terminal, the detection circuit and the main control circuit, and is configured to receive the input terminal according to the control of the main control circuit The low potential signal is converted into a high potential signal and output through the output terminal.
在其中一个实施例中，所述低电位信号为数字信号。In one of the embodiments, the low-level signal is a digital signal.
在其中一个实施例中，所述高电位信号为模拟电压信号。In one of the embodiments, the high-potential signal is an analog voltage signal.
在其中一个实施例中，所述检测电路包括电流传感器，所述电流传感器与所述输出端串联，设置为检测所述输出端输出的驱动电流。In one of the embodiments, the detection circuit includes a current sensor connected in series with the output terminal, and configured to detect the drive current output by the output terminal.
在其中一个实施例中，所述检测电路包括电阻及计算元件；所述电阻与所述输出端串联，所述计算元件与所述电阻的两端连接；所述计算元件设置为检测所述电阻两端的电压，并根据所述电阻两端的电压计算所述输出端输出的驱动电流。In one of the embodiments, the detection circuit includes a resistance and a calculation element; the resistance is connected in series with the output terminal, the calculation element is connected to both ends of the resistance; the calculation element is configured to detect the resistance The voltage at both ends, and the driving current output by the output end is calculated according to the voltage at both ends of the resistor.
在其中一个实施例中，所述预设电流有效值与所述电流保护值以表格的 形式存储于所述存储电路。In one of the embodiments, the preset current effective value and the current protection value are stored in the storage circuit in the form of a table.
在其中一个实施例中，所述预设电流有效值与所述电流保护值呈正相关变化。In one of the embodiments, the preset effective current value and the current protection value change in a positive correlation.
一种过流保护方法，所述过流保护方法包括：An overcurrent protection method, the overcurrent protection method includes:
存储预设电流有效值与对应的电流保护值；Store preset current effective value and corresponding current protection value;
检测输出端输出的驱动电流；Detect the drive current output by the output terminal;
根据所述驱动电流计算实际电流有效值；Calculate the actual current effective value according to the drive current;
将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。Comparing the actual current effective value with the preset current effective value, and searching for the corresponding current protection value according to the comparison result, so as to set the current protection value as the current protection threshold.
在其中一个实施例中，所述过流保护方法还包括：In one of the embodiments, the overcurrent protection method further includes:
判断所述驱动电流是否大于所述电流保护阈值；Determine whether the drive current is greater than the current protection threshold;
当所述驱动电流大于所述电流保护阈值时，控制所述输出端停止输出驱动电流。When the driving current is greater than the current protection threshold, the output terminal is controlled to stop outputting the driving current.
在其中一个实施例中，所述过流保护方法还包括将接收的低电位信号转换成高电位信号并通过所述输出端输出。In one of the embodiments, the overcurrent protection method further includes converting the received low-potential signal into a high-potential signal and outputting it through the output terminal.
在其中一个实施例中，所述预设电流有效值与所述电流保护值以表格的形式存储。In one of the embodiments, the preset current effective value and the current protection value are stored in the form of a table.
在其中一个实施例中，所述预设电流有效值与所述电流保护值呈正相关变化。In one of the embodiments, the preset effective current value and the current protection value change in a positive correlation.
一种显示装置，包括显示面板和驱动模块，所述显示面板包括显示区域及非显示区域，所述显示区域设置有多条数据线、多条扫描线及多个呈阵列布置的像素单元，所述驱动模块包括上述的过流保护***。A display device includes a display panel and a driving module. The display panel includes a display area and a non-display area. The display area is provided with a plurality of data lines, a plurality of scanning lines, and a plurality of pixel units arranged in an array. The drive module includes the above-mentioned overcurrent protection system.
在其中一个实施例中，所述像素单元分别与所述数据线及所述栅线电连 接。In one of the embodiments, the pixel unit is electrically connected to the data line and the gate line, respectively.
在其中一个实施例中，所述驱动模块还包括时序控制器及源极驱动单元，所述源极驱动单元与数据线电连接，所述时序控制器通过源极驱动单元为数据线提供数据信号和控制信号。In one of the embodiments, the driving module further includes a timing controller and a source driving unit, the source driving unit is electrically connected to the data line, and the timing controller provides the data signal to the data line through the source driving unit And control signals.
在其中一个实施例中，所述驱动模块还包括栅极驱动单元，所述时序控制器通过所述栅极驱动单元为栅线提供驱动信号和控制信号。In one of the embodiments, the driving module further includes a gate driving unit, and the timing controller provides a driving signal and a control signal for the gate line through the gate driving unit.
在其中一个实施例中，还包括印刷电路板，所述时序控制器及上述过流保护***均设置于所述印刷电路板上。In one of the embodiments, it further includes a printed circuit board, and the timing controller and the overcurrent protection system are all provided on the printed circuit board.
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其它特征、目的和优点将从说明书、附图以及权利要求书变得明显。The details of one or more embodiments of the application are set forth in the drawings and description below. Other features, objects, and advantages of this application will become apparent from the description, drawings, and claims.
附图说明BRIEF DESCRIPTION
为了更清楚地说明本申请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他实施例的附图。In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, drawings of other embodiments can be obtained based on these drawings.
图1为一个实施例提供的过流保护***的原理框图；FIG. 1 is a schematic block diagram of an overcurrent protection system provided by an embodiment;
图2为另一个实施例提供的过流保护***的原理框图；2 is a schematic block diagram of an overcurrent protection system provided by another embodiment;
图3为一个实施例提供的转换电路的电路图；3 is a circuit diagram of a conversion circuit provided by an embodiment;
图4为一个实施例提供的低电位信号和高电位信号的波形图；4 is a waveform diagram of a low potential signal and a high potential signal provided by an embodiment;
图5为一个实施例提供的显示装置的结构示意图；5 is a schematic structural diagram of a display device provided by an embodiment;
图6为一个实施例提供的过流保护方法的流程图。6 is a flowchart of an overcurrent protection method provided by an embodiment.
具体实施方式detailed description
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的首选实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容更加透彻全面。In order to facilitate understanding of the application, the application will be described more fully below with reference to related drawings. The drawings show preferred embodiments of the present application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terminology used in the specification of the present application herein is for the purpose of describing specific embodiments only, and is not intended to limit the present application. The term "and/or" as used herein includes any and all combinations of one or more related listed items.
需要说明的是，当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element or there may be a center element at the same time.
下面结合附图，对本申请的具体实施方式进行详细描述。The specific implementation of the present application will be described in detail below with reference to the drawings.
请参阅图1，图1为本申请提供的过流保护***的原理框图。所述过流保护***应用于为显示面板充电的升压集成电路中。所述过流保护***包括存储电路10、检测电路20、计算电路30及查找电路40。Please refer to FIG. 1, which is a functional block diagram of an overcurrent protection system provided by this application. The overcurrent protection system is applied to a boost integrated circuit that charges a display panel. The overcurrent protection system includes a storage circuit 10, a detection circuit 20, a calculation circuit 30, and a search circuit 40.
所述存储电路10用于存储预设电流有效值与对应的电流保护值。The storage circuit 10 is used to store a preset current effective value and a corresponding current protection value.
所述电流保护值为显示面板最大允许的驱动电流值，若显示面板的驱动电流大于所述电流保护值，则会引起显示面板损坏。所述预设电流有效值为存储于所述存储电路10中与所述电流保护值对应的电流有效值。The current protection value is the maximum allowable drive current value of the display panel. If the drive current of the display panel is greater than the current protection value, the display panel may be damaged. The preset effective current value is the effective current value stored in the storage circuit 10 corresponding to the current protection value.
所述预设电流有效值及所述电流保护值的数量均为多个且一一对应。所述预设电流有效值与所述电流保护值呈正相关变化。在一实施例中，所述预设电流有效值与所述电流保护值以表格的形式存储于所述存储电路10。The preset current effective value and the current protection value are both multiple and correspond to each other. The preset current effective value and the current protection value change in a positive correlation. In an embodiment, the preset effective current value and the current protection value are stored in the storage circuit 10 in the form of a table.
所述检测电路20与输出端VOUT连接。所述检测电路20用于检测所述输出端VOUT输出的驱动电流。The detection circuit 20 is connected to the output terminal VOUT. The detection circuit 20 is used to detect the drive current output by the output terminal VOUT.
所述输出端VOUT用于输出高电位信号至显示面板的移位寄存器，所述高电位信号用于驱动显示面板。所述高电位信号为模拟电压信号。The output terminal VOUT is used to output a high potential signal to the shift register of the display panel, and the high potential signal is used to drive the display panel. The high potential signal is an analog voltage signal.
在一实施例中，所述检测电路20可以包括电阻21及计算元件22。所述电阻21与所述输出端VOUT串联，所述计算元件22与所述电阻21的两端连接。所述计算元件22用于检测所述电阻21两端的电压，并根据所述电阻21两端的电压计算所述电阻21的电流，所述电阻21的电流即所述输出端VOUT输出的驱动电流。通过检测电阻21两端的电压，进而根据欧姆定律计算通过电阻21的电流，检测精度高，检测电路简单。In an embodiment, the detection circuit 20 may include a resistor 21 and a calculation element 22. The resistor 21 is connected in series with the output terminal VOUT, and the computing element 22 is connected to both ends of the resistor 21. The calculating element 22 is used for detecting the voltage across the resistor 21 and calculating the current of the resistor 21 according to the voltage across the resistor 21, the current of the resistor 21 being the driving current output by the output terminal VOUT. By detecting the voltage across the resistor 21 and then calculating the current through the resistor 21 according to Ohm's law, the detection accuracy is high and the detection circuit is simple.
请参阅图2，在一实施例中，所述检测电路20可以包括电流传感器23，所述电流传感器23与所述输出端VOUT串联，用于检测所述输出端VOUT输出的驱动电流。采用电流传感器23检测输出端VOUT输出的驱动电流，检测方便，响应快。Please refer to FIG. 2. In an embodiment, the detection circuit 20 may include a current sensor 23 that is connected in series with the output terminal VOUT to detect the drive current output by the output terminal VOUT. The current sensor 23 is used to detect the drive current output by the output terminal VOUT, which is convenient for detection and fast in response.
所述计算电路30与所述检测电路20连接。所述计算电路30用于根据所述驱动电流计算实际电流有效值。The calculation circuit 30 is connected to the detection circuit 20. The calculation circuit 30 is used for calculating an actual current effective value according to the driving current.
在一实施例中，若所述检测电路20检测到的所述输出端VOUT输出的驱动电流分别为I1、I2、…、In，则所述实际电流有效值为Irms＝﹛[(I1)^2+(I2)^2+…+(In)^2]/n﹜^(1/2)。In an embodiment, if the driving current output by the output terminal VOUT detected by the detection circuit 20 is I1, I2, ..., In, the effective value of the actual current is Irms=﹛[(I1)^ 2+(I2)^2+…+(In)^2]/n﹜^(1/2).
所述查找电路40分别与所述计算电路30及所述存储电路10连接。所述查找电路40用于将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。The search circuit 40 is connected to the calculation circuit 30 and the storage circuit 10 respectively. The search circuit 40 is used for comparing the actual current effective value with the preset current effective value, and searching for the corresponding current protection value according to the comparison result, so as to set the current protection value as the current protection threshold.
所述电流保护阈值为显示面板最大允许的驱动电流值。The current protection threshold is the maximum allowable driving current value of the display panel.
在一实施例中，所述存储电路10存储了N个预设电流有效值及N个电流保护值，N个预设电流有效值分别为RMS1、RMS2、…、RMS N-1、RMS N，预设电流有效值RMS1对应的电流保护值为OCP1，预设电流有效值RMS2对应的电流保护值为OCP2，…，预设电流有效值RMS N-1对应的电流保护值为OCP N-1，预设电流有效值RMS N对应的电流保护值为OCP N，其中，RMS N>RMS N-1>……>RMS2>RMS1，相应的OCP N>OCP N-1>……>OCP2>OCP1。所述实际电流有效值为RMS。若RMS≤RMS1，则查找预设电流有效值RMS1对应的电流保护值OCP1，并将电流保护值为OCP1设定为电流保护阈值；若RMS1＜RMS≤RMS2，则查找预设电流有效值RMS2对应的电流保护值OCP2，并将电流保护值为OCP2设定为电流保护阈值；依此类推，若RMS N-1＜RMS≤RMSN，则查找预设电流有效值RMSN对应的电流保护值OCPN，并将电流保护值为OCPN设定为电流保护阈值。如此便可以对显示面板的电流保护阈值进行动态设置。In one embodiment, the storage circuit 10 stores N preset current effective values and N current protection values, the N preset current effective values are RMS1, RMS2, ..., RMS N-1, RMS N, The current protection value corresponding to the preset current effective value RMS1 is OCP1, the current protection value corresponding to the preset current effective value RMS2 is OCP2,..., the current protection value corresponding to the preset current effective value RMSN-1 corresponds to OCP N-1, The current protection value corresponding to the preset current effective value RMSN is OCPN, where RMSN>RMSN-1>......>RMS2>RMS1, the corresponding OCPN>OCPN-1>......>OCP2>OCP1. The effective value of the actual current is RMS. If RMS≤RMS1, find the current protection value OCP1 corresponding to the preset current effective value RMS1, and set the current protection value to OCP1 as the current protection threshold; if RMS1<RMS≤RMS2, then find the corresponding current effective value RMS2 Current protection value OCP2, and set the current protection value OCP2 as the current protection threshold; and so on, if RMS N-1<RMS≤RMSN, then find the current protection value OCPN corresponding to the preset current effective value RMSN, and Set the current protection value to OCPN as the current protection threshold. In this way, the current protection threshold of the display panel can be dynamically set.
所述过流保护***还包括主控电路50。所述主控电路50分别与所述检测电路20及所述查找电路40连接，用于判断所述驱动电流是否大于所述电流保护阈值。所述主控电路50还用于当所述驱动电流大于所述电流保护阈值时，控制所述输出端VOUT停止输出驱动电流。所述驱动电流为驱动显示面板工作的电流。所述输出端VOUT停止输出驱动电流，则升压集成电路停止工作，从而显示面板停止工作，避免了显示面板的驱动电流过大，引起显示面板的发热量过大，导致显示面板烧屏的发生。The overcurrent protection system also includes a main control circuit 50. The main control circuit 50 is respectively connected to the detection circuit 20 and the search circuit 40, and is used to determine whether the driving current is greater than the current protection threshold. The main control circuit 50 is also used to control the output terminal VOUT to stop outputting the drive current when the drive current is greater than the current protection threshold. The driving current is a current driving the display panel to work. When the output terminal VOUT stops outputting the driving current, the boost integrated circuit stops working, so that the display panel stops working, avoiding excessive driving current of the display panel, causing excessive heat generation of the display panel, and causing burn-in of the display panel .
所述过流保护***还包括转换电路60。所述转换电路60分别与输入端VIN、所述检测电路20及所述主控电路50连接。所述转换电路60用于根据 所述主控电路50的控制将所述输入端VIN接收的低电位信号转换成高电位信号并通过所述输出端VOUT输出。所述低电位信号为数字信号。The overcurrent protection system also includes a conversion circuit 60. The conversion circuit 60 is connected to the input terminal VIN, the detection circuit 20 and the main control circuit 50 respectively. The conversion circuit 60 is used to convert the low potential signal received by the input terminal VIN into a high potential signal according to the control of the main control circuit 50 and output it through the output terminal VOUT. The low potential signal is a digital signal.
请参阅图3，所述转换电路60包括第一电子开关Q1、第二电子开关Q2、第三电子开关Q3、第四电子开关Q4、第五电子开关Q5、第六电子开关Q6、第七电子开关Q7及第八电子开关Q8。所述第一电子开关Q1的第一端接收低电位信号A，所述第一电子开关Q1的第二端与第一电源VDD连接，所述第一电子开关Q1的第三端与所述第四电子开关Q4的第一端连接。所述第二电子开关Q2的第一端接收所述低电位信号A的反相信号
Figure PCTCN2019071070-appb-000001
所述第二电子开关Q2的第二端与所述第一电子开关Q1的第二端连接，所述第二电子开关Q2的第三端与所述第三电子开关Q3的第一端连接。所述第三电子开关Q3的第二端与所述第四电子开关Q4的第二端及第二电源VGL连接，所述第三电子开关Q3的第三端还与所述第一电子开关Q1的第三端连接。所述第四电子开关Q4的第三端还与所述第二电子开关Q2的第三端连接。所述第五电子开关Q5的第二端与第三电源VGH连接，所述第五电子开关Q5的第三端与所述第六电子开关Q6的第一端连接。所述第六电子开关Q6的第二端与所述第五电子开关Q5的第二端连接，所述第六电子开关Q6的第三端与所述第五电子开关Q5的第一端连接。所述第七电子开关Q7的第一端与所述第二电子开关Q2的第三端连接，所述第七电子开关Q7的第二端与第二电源VGL连接，所述第七电子开关Q7的第三端与所述第六电子开关Q6的第一端连接。所述第八电子开关Q8的第一端与所述第一电子开关Q1的第三端连接，所述第八电子开关Q8的第二端与所述第七电子开关Q7的第二端连接，所述第八电子开关Q8的第三端与所述第六电子开关Q6的第三端连接。所述第三电子开关Q3的第一端的信号与所述第四电子开关Q4的第一端的信号互为反相信 号，即所述第七电子开关Q7的第一端的信号与所述第八电子开关Q8的第一端的信号互为反相信号，如图4所示，所述第三电子开关Q3的第一端的信号及所述第七电子开关Q7的第一端的信号为B，所述第四电子开关Q4的第一端的信号及所述第八电子开关Q8的第一端的信号为
Figure PCTCN2019071070-appb-000002
所述第六电子开关Q6的第三端输出高电位信号C。 3, the conversion circuit 60 includes a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3, a fourth electronic switch Q4, a fifth electronic switch Q5, a sixth electronic switch Q6, a seventh electronic Switch Q7 and the eighth electronic switch Q8. The first terminal of the first electronic switch Q1 receives the low potential signal A, the second terminal of the first electronic switch Q1 is connected to the first power supply VDD, and the third terminal of the first electronic switch Q1 is connected to the first The first end of the four electronic switches Q4 is connected. The first end of the second electronic switch Q2 receives the inverted signal of the low potential signal A
Figure PCTCN2019071070-appb-000001
The second end of the second electronic switch Q2 is connected to the second end of the first electronic switch Q1, and the third end of the second electronic switch Q2 is connected to the first end of the third electronic switch Q3. The second end of the third electronic switch Q3 is connected to the second end of the fourth electronic switch Q4 and the second power supply VGL, and the third end of the third electronic switch Q3 is also connected to the first electronic switch Q1 The third end of the connection. The third terminal of the fourth electronic switch Q4 is also connected to the third terminal of the second electronic switch Q2. The second end of the fifth electronic switch Q5 is connected to the third power supply VGH, and the third end of the fifth electronic switch Q5 is connected to the first end of the sixth electronic switch Q6. The second end of the sixth electronic switch Q6 is connected to the second end of the fifth electronic switch Q5, and the third end of the sixth electronic switch Q6 is connected to the first end of the fifth electronic switch Q5. The first end of the seventh electronic switch Q7 is connected to the third end of the second electronic switch Q2, the second end of the seventh electronic switch Q7 is connected to the second power supply VGL, and the seventh electronic switch Q7 The third end of is connected to the first end of the sixth electronic switch Q6. The first end of the eighth electronic switch Q8 is connected to the third end of the first electronic switch Q1, and the second end of the eighth electronic switch Q8 is connected to the second end of the seventh electronic switch Q7, The third terminal of the eighth electronic switch Q8 is connected to the third terminal of the sixth electronic switch Q6. The signal at the first end of the third electronic switch Q3 and the signal at the first end of the fourth electronic switch Q4 are mutually inverse signals, that is, the signal at the first end of the seventh electronic switch Q7 and the signal The signals at the first terminal of the eighth electronic switch Q8 are inverted signals. As shown in FIG. 4, the signals at the first terminal of the third electronic switch Q3 and the signals at the first terminal of the seventh electronic switch Q7 Is B, the signal at the first end of the fourth electronic switch Q4 and the signal at the first end of the eighth electronic switch Q8 are
Figure PCTCN2019071070-appb-000002
The third terminal of the sixth electronic switch Q6 outputs a high potential signal C.
所述转换电路60的工作原理如下：The working principle of the conversion circuit 60 is as follows:
所述低电位信号A在一个周期内包括低电平及高电平。所述第一电源VDD为正电压直流电源且电压为所述低电位信号A的高电平的绝对值。所述第二电源VGL为负电压直流电源且电压的绝对值大于所述低电位信号A的低电平的绝对值。所述第三电源VGH为正电压直流电源且电压大于所述第一电源VDD的电压。The low-potential signal A includes a low level and a high level in one cycle. The first power supply VDD is a positive voltage DC power supply and the voltage is the absolute value of the high level of the low potential signal A. The second power supply VGL is a negative voltage DC power supply and the absolute value of the voltage is greater than the absolute value of the low level of the low potential signal A. The third power supply VGH is a positive voltage DC power supply and the voltage is greater than the voltage of the first power supply VDD.
当所述低电位信号A为高电平时，所述低电位信号A的反相信号
Figure PCTCN2019071070-appb-000003
为低电平，所述第一电子开关Q1截止，所述第二电子开关Q2导通，所述第三电子开关Q3导通，所述第七电子开关Q7导通，所述第四电子开关Q4及所述第八电子开关Q8截止，由于所述第七电子开关Q7导通，进而所述第六电子开关Q6导通，所述第六电子开关Q6的第三端与所述第三电源VGH导通，所述第六电子开关Q6的第三端输出高电平且电压为所述第三电源VGH的电压。 When the low potential signal A is at a high level, the inverted signal of the low potential signal A
Figure PCTCN2019071070-appb-000003
Low level, the first electronic switch Q1 is turned off, the second electronic switch Q2 is turned on, the third electronic switch Q3 is turned on, the seventh electronic switch Q7 is turned on, and the fourth electronic switch Q4 and the eighth electronic switch Q8 are turned off, because the seventh electronic switch Q7 is turned on, and thus the sixth electronic switch Q6 is turned on, the third terminal of the sixth electronic switch Q6 and the third power supply VGH is turned on, the third terminal of the sixth electronic switch Q6 outputs a high level and the voltage is the voltage of the third power supply VGH.
当所述低电位信号A为低电平时，所述低电位信号A的反相信号
Figure PCTCN2019071070-appb-000004
为高电平，所述第一电子开关Q1导通，所述第二电子开关Q2截止，所述第三电子开关Q3截止，所述第七电子开关Q7截止，所述第四电子开关Q4及所述第八电子开关Q8导通，由于所述第八电子开关Q8导通，所述第六电子开关Q6的第三端与所述第二电源VGL连接，所述第六电子开关Q6的第三端输 出低电平且电压为所述第二电源VGL的电压。 When the low potential signal A is at a low level, the inverted signal of the low potential signal A
Figure PCTCN2019071070-appb-000004
Is high, the first electronic switch Q1 is turned on, the second electronic switch Q2 is turned off, the third electronic switch Q3 is turned off, the seventh electronic switch Q7 is turned off, the fourth electronic switch Q4 and The eighth electronic switch Q8 is turned on, and because the eighth electronic switch Q8 is turned on, the third terminal of the sixth electronic switch Q6 is connected to the second power supply VGL, and the sixth terminal of the sixth electronic switch Q6 The three terminals output a low level and the voltage is the voltage of the second power supply VGL.
综上所述，请参阅图4，所述转换电路60将输入的电位绝对值较低的低电位信号A转换成电位绝对值较高的高电位信号C输出，所述第六电子开关Q6的第三端输出的高电位信号C的高电平为所述第三电源VGH，低电平为所述第二电源VGL。所述转换电路60将电位绝对值较低的低电位信号转换成电位绝对值较高的高电位信号，使得所述高电位信号能够有足够的电压驱动显示面板。In summary, referring to FIG. 4, the conversion circuit 60 converts the input low potential signal A with a lower absolute potential value into a high potential signal C with a higher absolute potential value for output. The sixth electronic switch Q6 The high level of the high potential signal C output from the third terminal is the third power supply VGH, and the low level is the second power supply VGL. The conversion circuit 60 converts a low-potential signal with a low absolute value of the potential into a high-potential signal with a high absolute value of the potential, so that the high-potential signal can drive the display panel with a sufficient voltage.
本申请还提供一种显示装置10，所述显示装置10包括显示面板100、驱动模块200及印刷电路板300。The present application also provides a display device 10, which includes a display panel 100, a driving module 200, and a printed circuit board 300.
显示面板100包括显示区域110及非显示区域120，显示区域110也即是有图像信息显示的一块区域，也可以称为显示区(active area)。显示区域110内设置有多条数据线111和多条栅线112。多条数据线111沿第一方向延伸，沿第二方向排列。栅线112也称为扫描线，多条栅线112沿第二方向延伸，沿第一方向排列。可以理解，栅线112和数据线111的延伸、排列方向是相反的，也就是数据线111的延伸方向为栅线112的排列方向，数据线111的排列方向为栅线112的延伸方向。同时第一方向、第二方向互相垂直，请参照图2，第一方向可以理解为垂直方向，也就是二维坐标里的Y轴的延伸方向，第二方向可以理解为水平方向，也就是二维坐标里的X轴的延伸方向。显示区域110内还设置有多个呈阵列布置的像素单元113，像素单元113分别与数据线111及栅线112电连接。非显示区域120通常指没有图像显示的区域，该部分区域主要用于将一些线路和部分传感器压合在这个区域。The display panel 100 includes a display area 110 and a non-display area 120. The display area 110 is an area in which image information is displayed, and may also be referred to as an active area. A plurality of data lines 111 and a plurality of gate lines 112 are provided in the display area 110. The plurality of data lines 111 extend in the first direction and are arranged in the second direction. The gate lines 112 are also called scanning lines, and a plurality of gate lines 112 extend along the second direction and are arranged along the first direction. It can be understood that the extending and arranging directions of the gate line 112 and the data line 111 are opposite, that is, the extending direction of the data line 111 is the arranging direction of the gate line 112, and the arranging direction of the data line 111 is the extending direction of the gate line 112. At the same time, the first direction and the second direction are perpendicular to each other, please refer to FIG. 2, the first direction can be understood as a vertical direction, that is, the extension direction of the Y axis in two-dimensional coordinates, the second direction can be understood as a horizontal direction, that is, two The extension direction of the X axis in dimensional coordinates. The display area 110 is also provided with a plurality of pixel units 113 arranged in an array. The pixel units 113 are electrically connected to the data lines 111 and the gate lines 112, respectively. The non-display area 120 generally refers to an area where no image is displayed, and this part of the area is mainly used to press some circuits and some sensors in this area.
本申请中，显示面板100可例如为TFT-LCD(Thin Film Transistor Liquid Crystal Displayer，薄膜晶体管液晶显示器)显示面板、OLED(Organic  Light-Emitting Diode，有机发光二极管)显示面板、QLED(Quantum Dot Light Emitting Diodes，量子点发光二极管)显示面板、曲面显示面板或其他显示面板。In this application, the display panel 100 may be, for example, a TFT-LCD (Thin Film Transistor Liquid Crystal Display) display panel, an OLED (Organic Light-Emitting Diode) display panel, and a QLED (Quantum Dot Light Emitting Diodes, quantum dot light-emitting diodes) display panels, curved display panels or other display panels.
驱动模块200可以包括时序控制器210、源极驱动单元220、栅极驱动单元230及上述的过流保护***240。源极驱动单元220与数据线111电连接，栅极驱动单元230与栅线112电连接。时序控制器210用于传输信号至源极驱动单元220及栅极驱动单元230。具体的，时序控制器210主要用于将***主板传输的R(Red，红色)/G(Green，绿色)/B(Blue，蓝色)压缩信号、控制信号及电源信号进行处理，通过源极驱动单元220为数据线111提供数据信号和控制信号以及通过栅极驱动单元230为栅线112提供驱动信号和控制信号，从而使得像素单元113能够进行正常的显示。The driving module 200 may include a timing controller 210, a source driving unit 220, a gate driving unit 230, and the overcurrent protection system 240 described above. The source driving unit 220 is electrically connected to the data line 111, and the gate driving unit 230 is electrically connected to the gate line 112. The timing controller 210 is used to transmit signals to the source driving unit 220 and the gate driving unit 230. Specifically, the timing controller 210 is mainly used to process the R (Red, Red)/G (Green, Green)/B (Blue, Blue) compressed signals, control signals, and power signals transmitted by the system motherboard through the source The driving unit 220 provides the data signal and the control signal for the data line 111 and the driving signal and the control signal for the gate line 112 through the gate driving unit 230, thereby enabling the pixel unit 113 to perform normal display.
印刷电路板300，简称PCB(Printed Circuit Board)。时序控制器210及过流保护***240均设置于印刷电路板300上。印刷电路板300是重要的电子部件，是电子元器件的支撑体，是电子元器件电气连接的载体。The printed circuit board 300 is abbreviated as PCB (Printed Circuit Board). The timing controller 210 and the overcurrent protection system 240 are both provided on the printed circuit board 300. The printed circuit board 300 is an important electronic component, a support for electronic components, and a carrier for electrical connection of electronic components.
上述的过流保护***及显示装置，通过检测输出端输出的驱动电流计算得到实际电流有效值，还通过实际电流有效值与存储的预设电流有效值进行对比，根据对比结果查找对应的电流保护值，以将电流保护值设定为电流保护阈值，从而能够对显示面板的电流保护阈值进行动态、合理地设置，能够实现对显示面板的有效保护。The above overcurrent protection system and display device calculate the actual current effective value by detecting the driving current output from the output terminal, and also compare the actual current effective value with the stored preset current effective value, and find the corresponding current protection according to the comparison result Value to set the current protection value as the current protection threshold, so that the current protection threshold of the display panel can be dynamically and reasonably set, and effective protection of the display panel can be achieved.
可以理解，图1所示的原理框图仅为示意，过流保护***还可包括比图1中所示更多或者更少的组件，或者具有与图1所示不同的配置。图1中所示的各组件可以采用硬件、软件或其组合实现。It can be understood that the principle block diagram shown in FIG. 1 is only an illustration, and the overcurrent protection system may further include more or fewer components than those shown in FIG. 1 or have a configuration different from that shown in FIG. 1. Each component shown in FIG. 1 may be implemented by hardware, software, or a combination thereof.
请参阅图5，其为本申请较佳实施例提供的过流保护方法的流程图。所 应说明的是，本申请的方法并不受限于下述步骤的顺序，且其他实施例中，本申请的方法可以只包括以下步骤的其中一部分，或者其中的部分步骤可以被删除。此外，在其他实施方式中，一个步骤可以被拆分为多个步骤，或者多个步骤也可以合并为一个步骤。Please refer to FIG. 5, which is a flowchart of an overcurrent protection method provided by a preferred embodiment of the present application. It should be noted that the method of the present application is not limited to the order of the following steps, and in other embodiments, the method of the present application may include only some of the following steps, or some of the steps may be deleted. In addition, in other embodiments, one step may be split into multiple steps, or multiple steps may also be combined into one step.
步骤S1，存储预设电流有效值与对应的电流保护值。Step S1, storing the preset current effective value and the corresponding current protection value.
步骤S2，检测输出端输出的驱动电流。In step S2, the driving current output by the output terminal is detected.
步骤S3，根据所述驱动电流计算实际电流有效值。Step S3: Calculate the actual effective current value according to the driving current.
步骤S4，将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。Step S4: Compare the actual current effective value with the preset current effective value, and search for the corresponding current protection value according to the comparison result, so as to set the current protection value as the current protection threshold.
所述过流保护方法还包括以下步骤：The overcurrent protection method further includes the following steps:
步骤S5，判断所述驱动电流是否大于所述电流保护阈值。Step S5: Determine whether the driving current is greater than the current protection threshold.
步骤S6，当所述驱动电流大于所述电流保护阈值时，控制所述输出端停止输出驱动电流。Step S6: When the driving current is greater than the current protection threshold, the output terminal is controlled to stop outputting the driving current.
需要说明的是，上述图1实施例中，对过流保护***的解释说明也适用于该实施例的过流保护方法，其实现原理类似，此处不再赘述。It should be noted that, in the embodiment of FIG. 1 described above, the explanation of the overcurrent protection system is also applicable to the overcurrent protection method of this embodiment, and its implementation principle is similar, and will not be repeated here.
如在本申请中所使用的，术语“单元”、“模块”和“***”等旨在表示计算机相关的实体，它可以是硬件、硬件和软件的组合、软件、或者执行中的软件。例如，单元可以是但不限于是，在处理器上运行的进程、处理器、对象、可执行码、执行的线程、程序和/或计算机。作为说明，运行在服务器上的应用程序和服务器都可以是单元。一个或多个单元可以驻留在进程和/或执行的线程中，并且单元可以位于一个计算机内和/或分布在两个或更多的计算机之间。As used in this application, the terms "unit," "module," and "system" are intended to mean computer-related entities, which may be hardware, a combination of hardware and software, software, or software in execution. For example, a unit may be, but is not limited to, a process running on a processor, a processor, an object, executable code, a thread of execution, a program, and/or a computer. As an illustration, both the application running on the server and the server can be units. One or more units may reside in a process and/or a thread of execution, and a unit may be located in one computer and/or distributed between two or more computers.
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The technical features of the above-mentioned embodiments can be arbitrarily combined. To simplify the description, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered within the scope of this description.
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。The above-mentioned embodiments only express several implementations of the present application, and their descriptions are more specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present application, a number of modifications and improvements can also be made, which all fall within the protection scope of the present application. Therefore, the protection scope of the patent of this application shall be subject to the appended claims.

Claims (19)

  1. 一种过流保护***，所述过流保护***包括：An overcurrent protection system. The overcurrent protection system includes:
    存储电路，设置为存储预设电流有效值与对应的电流保护值；Storage circuit, set to store preset current effective value and corresponding current protection value;
    检测电路，与输出端连接，设置为检测所述输出端输出的驱动电流；The detection circuit is connected to the output terminal and is configured to detect the drive current output by the output terminal;
    计算电路，与所述检测电路连接，设置为根据所述驱动电流计算实际电流有效值；及A calculation circuit, connected to the detection circuit, and configured to calculate an actual current effective value based on the drive current; and
    查找电路，分别与所述计算电路及所述存储电路连接，设置为将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。A search circuit is respectively connected to the calculation circuit and the storage circuit, and is configured to compare the actual current effective value with the preset current effective value, and search for the corresponding current protection value according to the comparison result, so as to compare The current protection value is set as the current protection threshold.
  2. 根据权利要求1所述的过流保护***，其中，还包括主控电路，所述主控电路分别与所述检测电路及所述查找电路连接，设置为判断所述驱动电流是否大于所述电流保护阈值；所述主控电路还设置为当所述驱动电流大于所述电流保护阈值时，控制所述输出端停止输出驱动电流。The overcurrent protection system according to claim 1, further comprising a main control circuit respectively connected to the detection circuit and the search circuit, and configured to determine whether the driving current is greater than the current Protection threshold; the main control circuit is further configured to control the output terminal to stop outputting the drive current when the drive current is greater than the current protection threshold.
  3. 根据权利要求1所述的过流保护***，其中，还包括转换电路，所述转换电路分别与输入端、所述检测电路及所述主控电路连接，设置为根据所述主控电路的控制将所述输入端接收的低电位信号转换成高电位信号并通过所述输出端输出。The overcurrent protection system according to claim 1, further comprising a conversion circuit respectively connected to the input terminal, the detection circuit and the main control circuit, and configured to be controlled according to the control of the main control circuit The low-potential signal received by the input terminal is converted into a high-potential signal and output through the output terminal.
  4. 根据权利要求1所述的过流保护***，其中，所述低电位信号为数字信号。The overcurrent protection system according to claim 1, wherein the low potential signal is a digital signal.
  5. 根据权利要求1所述的过流保护***，其中，所述高电位信号为模拟电压信号。The overcurrent protection system according to claim 1, wherein the high potential signal is an analog voltage signal.
  6. 根据权利要求1所述的过流保护***，其中，所述检测电路包括电流传感器，所述电流传感器与所述输出端串联，设置为检测所述输出端输出的 驱动电流。The overcurrent protection system according to claim 1, wherein the detection circuit includes a current sensor connected in series with the output terminal, and configured to detect the drive current output by the output terminal.
  7. 根据权利要求1所述的过流保护***，其中，所述检测电路包括电阻及计算元件；所述电阻与所述输出端串联，所述计算元件与所述电阻的两端连接；所述计算元件设置为检测所述电阻两端的电压，并根据所述电阻两端的电压计算所述输出端输出的驱动电流。The overcurrent protection system according to claim 1, wherein the detection circuit includes a resistance and a calculation element; the resistance is connected in series with the output terminal, and the calculation element is connected to both ends of the resistance; the calculation The element is configured to detect the voltage across the resistor and calculate the drive current output by the output terminal based on the voltage across the resistor.
  8. 根据权利要求1所述的过流保护***，其中，所述预设电流有效值与所述电流保护值以表格的形式存储于所述存储电路。The overcurrent protection system according to claim 1, wherein the preset current effective value and the current protection value are stored in the storage circuit in the form of a table.
  9. 根据权利要求1所述的过流保护***，其中，所述预设电流有效值与所述电流保护值呈正相关变化。The overcurrent protection system according to claim 1, wherein the preset current effective value and the current protection value change in a positive correlation.
  10. 一种过流保护方法，所述过流保护方法包括：An overcurrent protection method, the overcurrent protection method includes:
    存储预设电流有效值与对应的电流保护值；Store preset current effective value and corresponding current protection value;
    检测输出端输出的驱动电流；Detect the drive current output by the output terminal;
    根据所述驱动电流计算实际电流有效值；Calculate the actual current effective value according to the drive current;
    将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。Comparing the actual current effective value with the preset current effective value, and searching for the corresponding current protection value according to the comparison result, so as to set the current protection value as the current protection threshold.
  11. 根据权利要求10所述的过流保护方法，其中，所述过流保护方法还包括：The overcurrent protection method according to claim 10, wherein the overcurrent protection method further comprises:
    判断所述驱动电流是否大于所述电流保护阈值；Determine whether the drive current is greater than the current protection threshold;
    当所述驱动电流大于所述电流保护阈值时，控制所述输出端停止输出驱动电流。When the driving current is greater than the current protection threshold, the output terminal is controlled to stop outputting the driving current.
  12. 根据权利要求10所述的过流保护方法，其中，所述过流保护方法还包括将接收的低电位信号转换成高电位信号并通过所述输出端输出。The overcurrent protection method according to claim 10, wherein the overcurrent protection method further comprises converting the received low potential signal into a high potential signal and outputting it through the output terminal.
  13. 根据权利要求10所述的过流保护方法，其中，所述预设电流有效值 与所述电流保护值以表格的形式存储。The overcurrent protection method according to claim 10, wherein the preset effective current value and the current protection value are stored in the form of a table.
  14. 根据权利要求10所述的过流保护方法，其中，所述预设电流有效值与所述电流保护值呈正相关变化。The overcurrent protection method according to claim 10, wherein the preset effective current value and the current protection value change in a positive correlation.
  15. 一种显示装置，包括显示面板和驱动模块，所述显示面板包括显示区域及非显示区域，所述显示区域设置有多条数据线、多条扫描线及多个呈阵列布置的像素单元，所述驱动模块包括过流保护***，所述过流保护***包括存储电路、检测电路、计算电路及查找电路；所述存储电路设置为存储预设电流有效值与对应的电流保护值；所述检测电路与输出端连接，设置为检测所述输出端输出的驱动电流；所述计算电路与所述检测电路连接，设置为根据所述驱动电流计算实际电流有效值；所述查找电路分别与所述计算电路及所述存储电路连接，设置为将所述实际电流有效值与所述预设电流有效值进行对比，并根据对比结果查找对应的电流保护值，以将所述电流保护值设定为电流保护阈值。A display device includes a display panel and a driving module. The display panel includes a display area and a non-display area. The display area is provided with a plurality of data lines, a plurality of scanning lines, and a plurality of pixel units arranged in an array. The drive module includes an overcurrent protection system, the overcurrent protection system includes a storage circuit, a detection circuit, a calculation circuit, and a search circuit; the storage circuit is configured to store a preset current effective value and a corresponding current protection value; the detection The circuit is connected to the output terminal, and is configured to detect the drive current output by the output terminal; the calculation circuit is connected to the detection circuit, and is configured to calculate the actual current effective value according to the drive current; The calculation circuit is connected to the storage circuit, and is set to compare the actual current effective value with the preset current effective value, and to find a corresponding current protection value according to the comparison result, so as to set the current protection value to Current protection threshold.
  16. 根据权利要求15所述的显示装置，其中，所述像素单元分别与所述数据线及所述栅线电连接。The display device according to claim 15, wherein the pixel unit is electrically connected to the data line and the gate line, respectively.
  17. 根据权利要求15所述的显示装置，其中，所述驱动模块还包括时序控制器及源极驱动单元，所述源极驱动单元与数据线电连接，所述时序控制器通过源极驱动单元为数据线提供数据信号和控制信号。The display device according to claim 15, wherein the driving module further comprises a timing controller and a source driving unit, the source driving unit is electrically connected to the data line, and the timing controller uses the source driving unit as The data line provides data signals and control signals.
  18. 根据权利要求17所述的显示装置，其中，所述驱动模块还包括栅极驱动单元，所述时序控制器通过所述栅极驱动单元为栅线提供驱动信号和控制信号。The display device according to claim 17, wherein the driving module further comprises a gate driving unit, and the timing controller provides a driving signal and a control signal for the gate line through the gate driving unit.
  19. 根据权利要求17所述的显示装置，其中，还包括印刷电路板，所述时序控制器及上述过流保护***均设置于所述印刷电路板上。The display device according to claim 17, further comprising a printed circuit board, and the timing controller and the overcurrent protection system are both provided on the printed circuit board.
PCT/CN2019/071070 2018-12-27 2019-01-10 Overcurrent protection system and method, and display device WO2020133578A1 (en)

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