WO2020087559A1 - 过流保护电路及显示驱动装置 - Google Patents

过流保护电路及显示驱动装置 Download PDF

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Publication number
WO2020087559A1
WO2020087559A1 PCT/CN2018/114667 CN2018114667W WO2020087559A1 WO 2020087559 A1 WO2020087559 A1 WO 2020087559A1 CN 2018114667 W CN2018114667 W CN 2018114667W WO 2020087559 A1 WO2020087559 A1 WO 2020087559A1
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Prior art keywords
input terminal
voltage
voltage comparison
comparison module
module
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PCT/CN2018/114667
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English (en)
French (fr)
Inventor
黄笑宇
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惠科股份有限公司
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Application filed by 惠科股份有限公司 filed Critical 惠科股份有限公司
Priority to US17/042,764 priority Critical patent/US11688360B2/en
Publication of WO2020087559A1 publication Critical patent/WO2020087559A1/zh

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0812—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
    • H03K17/08122—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit in field-effect transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
    • H03K17/08142—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in field-effect transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0008—Arrangements for reducing power consumption
    • H03K19/0016—Arrangements for reducing power consumption by using a control or a clock signal, e.g. in order to apply power supply
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0857—Static memory circuit, e.g. flip-flop
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0027—Measuring means of, e.g. currents through or voltages across the switch

Definitions

  • the present application relates to an overcurrent protection circuit and a display driving device.
  • the liquid crystal display panel is a display device composed of a certain number of color or black and white pixels and placed in front of a light source or a reflective surface.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • the system motherboard connects the R / G / B compressed signal, control signal and power supply to the connector on the PCB through the wire, and the data passes through the TCON (Timing Controller) on the PCB.
  • the IC processing After the IC processing, it is connected to the display area through the PCB board through S-COF (Source-Chip on Film Source Film Driver Chip) and G-COF (Gate-Chip on Film Film Driver Chip), through the display array Data line and Scan line transmit voltage, so that TFT-LCD realizes display function. That is to say, in the liquid crystal display panel, the logic signal input at the front end needs to be converted into a driving signal through the corresponding driving chip.
  • S-COF Source-Chip on Film Source Film Driver Chip
  • G-COF Gate-Chip on Film Film Driver Chip
  • the inventor realized that because the front-end input is abnormal or the display array is abnormal, it is easy to cause the current input to the driver chip to be too large, causing the driver chip to be damaged due to overcurrent.
  • an overcurrent protection circuit and a display driving device are provided.
  • An overcurrent protection circuit includes a voltage generation module, a voltage comparison module, and a controlled switch module;
  • the first input terminal of the voltage comparison module is configured to access the logic signal
  • the second input terminal of the voltage comparison module is configured to access the logic signal through the voltage generation module
  • the output terminal of the voltage comparison module is connected to the controlled terminal of the controlled switch module
  • the input terminal of the controlled switch module is set to access logic signals, and the output terminal of the controlled switch module is set to the input terminal connected to the driver chip;
  • the voltage comparison module is configured to control the conduction of the input and output terminals of the controlled switch module through the controlled terminal when the voltage at the first input terminal is the same as the voltage at the second input terminal; otherwise, the controlled terminal controls the The input and output are turned off.
  • the voltage generating module includes a voltage stabilizing circuit
  • One end of the voltage stabilizing circuit is set to access the logic signal and connected to the second input end;
  • the other end of the voltage stabilizing circuit is set to ground.
  • the voltage stabilizing circuit includes a voltage stabilizing capacitor.
  • the controlled switch module includes an electronic switch or a field effect transistor
  • the controlled end of the controlled switch module is the gate of the field effect tube.
  • the controlled switch module includes a P-channel field effect transistor
  • the controlled end of the controlled switch module is the gate of the P-channel field effect transistor, the input end of the controlled switch module is the source of the P-channel field effect transistor, and the output end of the controlled switch module is the drain of the P-channel field effect transistor pole.
  • it further includes a bias resistor
  • the gate of the P-channel field effect transistor is connected to the source of the P-channel field effect transistor through a bias resistor.
  • the voltage comparison module includes a comparator
  • the first input terminal of the voltage comparison module is the inverting input terminal of the comparator
  • the second input terminal of the voltage comparison module is the non-inverting input terminal of the comparator
  • the output terminal of the voltage comparison module is the output terminal of the comparator.
  • the voltage comparison module further includes a rising edge D flip-flop
  • the control end of the rising edge D flip-flop is connected to the output of the comparator, the pulse input end of the rising edge D flip-flop is set to access the preset high-level signal, and the output end of the rising edge D flip-flop is the output end of the voltage comparison module .
  • the voltage comparison module includes a NAND circuit
  • the first input terminal of the voltage comparison module is an input terminal of the NAND circuit
  • the second input terminal of the voltage comparison module is the other input terminal of the NAND circuit
  • the output terminal of the voltage comparison module is the output of the NAND circuit end.
  • a display driving device including a driving chip and an overcurrent protection circuit
  • the overcurrent protection circuit includes a voltage generation module, a voltage comparison module and a controlled switch module;
  • the first input terminal of the voltage comparison module is configured to access the logic signal
  • the second input terminal of the voltage comparison module is configured to access the logic signal through the voltage generation module
  • the output terminal of the voltage comparison module is connected to the controlled terminal of the controlled switch module
  • the input terminal of the controlled switch module is set to access logic signals, and the output terminal of the controlled switch module is set to the input terminal connected to the driver chip;
  • the voltage comparison module is configured to control the conduction of the input and output terminals of the controlled switch module through the controlled terminal when the voltage at the first input terminal is the same as the voltage at the second input terminal; otherwise, the controlled terminal controls the The input and output terminals are turned off;
  • the output end of the driving chip is set to output a driving signal to the display array of the liquid crystal display panel.
  • the voltage generating module includes a voltage stabilizing circuit
  • One end of the voltage stabilizing circuit is set to access the logic signal and connected to the second input end;
  • the other end of the voltage stabilizing circuit is set to ground.
  • the voltage stabilizing circuit includes a voltage stabilizing capacitor.
  • the controlled switch module includes an electronic switch or a field effect transistor
  • the controlled end of the controlled switch module is the gate of the field effect tube.
  • the controlled switch module includes a P-channel field effect transistor
  • the controlled end of the controlled switch module is the gate of the P-channel field effect transistor, the input end of the controlled switch module is the source of the P-channel field effect transistor, and the output end of the controlled switch module is the drain of the P-channel field effect transistor pole.
  • it further includes a bias resistor
  • the gate of the P-channel field effect transistor is connected to the source of the P-channel field effect transistor through a bias resistor.
  • the voltage comparison module includes a comparator
  • the first input terminal of the voltage comparison module is the inverting input terminal of the comparator
  • the second input terminal of the voltage comparison module is the non-inverting input terminal of the comparator
  • the output terminal of the voltage comparison module is the output terminal of the comparator.
  • the voltage comparison module further includes a rising edge D flip-flop
  • the control end of the rising edge D flip-flop is connected to the output of the comparator, the pulse input end of the rising edge D flip-flop is set to access the preset high-level signal, and the output end of the rising edge D flip-flop is the output end of the voltage comparison module .
  • the voltage comparison module includes a NAND circuit
  • the first input terminal of the voltage comparison module is an input terminal of the NAND circuit
  • the second input terminal of the voltage comparison module is the other input terminal of the NAND circuit
  • the output terminal of the voltage comparison module is the output of the NAND circuit end.
  • a display device including a display driving device, a backlight board and a display array
  • the display driving device includes a driving chip and an overcurrent protection circuit
  • the overcurrent protection circuit includes a voltage generation module, a voltage comparison module and a controlled switch module;
  • the first input terminal of the voltage comparison module is configured to access the logic signal
  • the second input terminal of the voltage comparison module is configured to access the logic signal through the voltage generation module
  • the output terminal of the voltage comparison module is connected to the controlled terminal of the controlled switch module
  • the input terminal of the controlled switch module is set to access logic signals, and the output terminal of the controlled switch module is set to the input terminal connected to the driver chip;
  • the voltage comparison module is configured to control the conduction of the input and output terminals of the controlled switch module through the controlled terminal when the voltage at the first input terminal is the same as the voltage at the second input terminal; otherwise, the controlled terminal controls the The input and output terminals are turned off;
  • the output end of the driving chip is set to output a driving signal to the display array
  • the backlight panel is configured to provide a light source to the display array.
  • the display array includes a liquid crystal display array.
  • FIG. 1 is a structural diagram of an overcurrent protection circuit module according to one or more embodiments
  • FIG. 2 is a circuit diagram of an overcurrent protection circuit according to one or more embodiments
  • FIG. 3 is a circuit diagram of another overcurrent protection circuit according to one or more embodiments.
  • FIG. 4 is a structural diagram of a display driving device module according to one or more embodiments.
  • An embodiment of the present invention provides an overcurrent protection circuit.
  • an overcurrent protection circuit of an embodiment includes a voltage generation module 100, a voltage comparison module 101, and a controlled switch module 102;
  • the first input terminal of the voltage comparison module 101 is configured to access the logic signal
  • the second input terminal of the voltage comparison module 101 is configured to access the logic signal through the voltage generation module 100
  • the output terminal of the voltage comparison module 101 is connected to the controlled switch module Controlled end
  • the connected logic signal is a logic signal input at the front end, and is generally an electrical signal in the form of a voltage pulse, which is transmitted from the system motherboard to the driving chip. Due to the constant power of the system board, the voltage corresponding to the logic signal will drop when there is an overcurrent at the front-end input.
  • the voltage generation module 100 generates a reference voltage at the second input terminal of the voltage comparison module 101 with the voltage corresponding to the normal logic signal. As a preferred embodiment, the reference voltage is the same as the voltage corresponding to the normal logic signal. At the same time, when an overcurrent occurs in the logic signal and the voltage corresponding to the logic signal becomes small, the magnitude of the reference voltage generated by the voltage generation module 100 remains unchanged.
  • the voltage generating module 100 includes a voltage stabilizing circuit
  • One end of the voltage stabilizing circuit is set to access the logic signal and connected to the second input end;
  • the other end of the voltage stabilizing circuit is set to ground.
  • the voltage at the second input terminal is the same as the first input terminal.
  • the voltage at the first output terminal drops, and the voltage at the second output terminal remains unchanged due to the voltage stabilizing effect of the voltage stabilizing circuit. Therefore, when an overcurrent occurs in the logic signal, a voltage difference occurs between the first input terminal and the second output terminal.
  • FIG. 2 is a circuit diagram of an overcurrent protection circuit according to one or more embodiments.
  • the voltage stabilizing circuit includes a voltage stabilizing capacitor C1;
  • the voltage stabilizing capacitor C1 when the logic signal is normal, the voltage stabilizing capacitor C1 is charged, and after the charging is completed, the voltage at the second input terminal is the same as the voltage at the first input terminal.
  • the voltage at the first input terminal drops, and the voltage stabilizing capacitor C1 maintains a stable voltage difference across the voltage stabilizing capacitor C1 due to the completion of charging, so that the voltage at the second input terminal remains unchanged.
  • the voltage stabilizing circuit includes a voltage stabilizing diode
  • the negative pole of the voltage stabilizing diode is set to access the logic signal and connected to the second input terminal;
  • the anode of the Zener diode is set to ground.
  • the input end of the controlled switch module 102 is set to access logic signals, and the output end of the controlled switch module 102 is set to the input end connected to the driving chip;
  • the input terminal and the output terminal of the controlled switch module 102 are connected to form a path, and the logic signal can be sequentially transmitted to the input terminal of the driving chip through the input terminal and the output terminal of the controlled switch module 102.
  • the voltage comparison module 101 is configured to control the conduction of the input terminal and the output terminal of the controlled switch module 102 through the controlled terminal when the voltage at the first input terminal is the same as the voltage at the second input terminal, otherwise the controlled terminal controls the controlled switch
  • the input terminal and output terminal of the module 102 are turned off.
  • the voltage comparison module 101 compares the first input terminal voltage with the second input terminal voltage, and outputs an electrical signal to the controlled terminal of the controlled switch module 102 according to the comparison result to control the controlled switch module 102 On or off.
  • the output electrical signal can make the input terminal and the output terminal of the controlled switch module 102 conduct; the voltage comparison module 101
  • the output electrical signal can make the input terminal and the output terminal of the controlled switch module 102 be turned off.
  • the controlled switch module 102 includes an electronic switch or a field effect transistor
  • the controlled end of the controlled switch module 102 is the gate of the field effect transistor.
  • the controlled terminal of the electronic switch receives the electrical signal transmitted by the voltage comparison module 101, and controls the input terminal and the output terminal to be turned on or off according to a preset logic.
  • the electrical signal transmitted by the voltage comparison module 101 can determine whether the logic level of the gate voltage of the field effect transistor is high or low, so as to turn on or off the source and drain.
  • the controlled switch module 102 includes a P-channel field effect transistor
  • the controlled end of the controlled switch module 102 is the gate of the P-channel field effect transistor Q1
  • the input end of the controlled switch module 102 is the source of the P-channel field effect transistor Q1
  • the output end of the controlled switch module 102 is the P channel Drain of MOSFET Q1.
  • the output electrical signal when the voltage at the first input terminal and the voltage at the second input terminal of the voltage comparison module 101 are the same, the output electrical signal is at a low level, and the P-channel field effect transistor Q1 is turned on; When the voltage at the first input terminal is different from the voltage at the second input terminal, the output electrical signal is at a high level, and the P-channel field effect transistor Q1 is turned off.
  • it further includes a bias resistor Rt;
  • the gate of the P-channel field effect transistor Q1 is connected to the source of the P-channel field effect transistor Q1 through a bias resistor Rt.
  • the gate of the P-channel field effect transistor Q1 is connected to its source through a bias resistor Rt.
  • the bias resistance Rt is used to provide a bias voltage for the field effect transistor to better maintain the operating characteristics of the field effect transistor
  • the voltage comparison module 101 includes a comparator D1;
  • the first input terminal of the voltage comparison module 101 is the inverting input terminal of the comparator D1
  • the second input terminal of the voltage comparison module 101 is the non-inverting input terminal of the comparator D1
  • the output terminal of the voltage comparison module 101 is the output of the comparator D1 end.
  • the voltage of the non-inverting input terminal of the comparator D1 is the same as the voltage of the inverting input terminal, and the comparator D1 outputs a low level, so that the input terminal and the output terminal of the controlled switch module 102 are turned on; At this time, the voltage at the non-inverting input terminal of the comparator D1 is greater than the voltage at the inverting input terminal, and the comparator D1 outputs a high level, so that the input terminal and the output terminal of the controlled switch module 102 are turned off.
  • the voltage comparison module 101 further includes a rising edge D flip-flop D2;
  • the control terminal C of the rising edge D flip-flop D2 is connected to the output terminal of the comparator D1, the pulse input terminal D of the rising edge D flip-flop D2 is set to access a preset high-level signal, and the output terminal Q of the rising edge D flip-flop D2 It is the output of the voltage comparison module 101.
  • the voltage of the non-inverting input terminal of the comparator D1 when the logic signal is normal, the voltage of the non-inverting input terminal of the comparator D1 is the same as the voltage of the inverting input terminal, the comparator D1 outputs a low level, and the control terminal C of the flip-flop D2 of the rising edge receives low Level, the output Q of the flip-flop D2 at the rising edge outputs a low level, making the input and output of the controlled switch module 102 conductive; when the logic signal is overcurrent, the voltage at the non-inverting input of the comparator D1 is greater than the inverse Phase input voltage, the output of the comparator D1 changes from low level to high level, when the control terminal C of the rising edge D flip-flop D2 receives the rising edge from low level to high level, the rising edge D flip-flop D2 assigns the preset high-level signal of its pulse input terminal D to the output terminal Q to control the input terminal and the output terminal of the controlled switch module 102 to be turned off. In one of
  • it further includes a first protection resistor R1;
  • the output terminal of the comparator D1 is set to be grounded through the first protection resistor R1.
  • it further includes a second protection resistor R2;
  • the output terminal Q of the rising edge D flip-flop D2 is set to be grounded through the second protection resistor R2.
  • FIG. 3 is another overcurrent protection circuit diagram according to one or more embodiments.
  • the voltage comparison module 101 includes a NAND circuit D3;
  • the first input terminal of the voltage comparison module 101 is an input terminal of the NAND circuit D3
  • the second input terminal of the voltage comparison module 101 is the other input terminal of the NAND circuit D3
  • the output terminal of the voltage comparison module 101 is The output of NOT gate D3.
  • the corresponding voltage when the logic signal is normal, the corresponding voltage is a high-level voltage 1; when the logic signal is overcurrent, the corresponding voltage is a low-level voltage 0.
  • the NAND circuit When the logic signal is normal, the NAND circuit outputs a low-level voltage of 0, so that the input terminal and the output terminal of the controlled switch module 102 are turned on; when the logic signal is overcurrent, the NAND circuit outputs a high-level voltage 1. In order to turn off the input terminal and the output terminal of the controlled switch module 102.
  • the embodiment of the invention also provides a display driving device.
  • the display driving device includes a driving chip 200 and an overcurrent protection circuit 201;
  • the overcurrent protection circuit 201 includes a voltage generation module 100, a voltage comparison module 101, and a controlled switch module 102;
  • the first input terminal of the voltage comparison module 101 is configured to access the logic signal
  • the second input terminal of the voltage comparison module 101 is configured to access the logic signal through the voltage generation module 100
  • the output terminal of the voltage comparison module 101 is connected to the controlled switch module 102 Controlled end of
  • the input end of the controlled switch module 102 is set to access logic signals, and the output end of the controlled switch module 102 is set to the input end connected to the driving chip 200;
  • the voltage comparison module 101 is configured to control the conduction of the input terminal and the output terminal of the controlled switch module 102 through the controlled terminal when the voltage at the first input terminal is the same as the voltage at the second input terminal, otherwise the controlled terminal
  • the input end and output end of the module 102 are turned off;
  • the output end of the driving chip 200 is configured to output a driving signal to the display array of the liquid crystal display panel.
  • the voltage generation module 100 makes the voltage at the first input terminal and the second input terminal of the voltage comparison module 101 the same, and the input of the controlled switch module 102 The terminal and the output terminal are connected, and the logic signal is transmitted to the driving chip for normal operation.
  • the voltage comparison module 101 controls the input terminal of the controlled switch module 102 to The output terminal is turned off to prevent the overcurrent front-end input current from being transmitted to the driver chip and avoid damage to the driver chip. Based on this, the effect of overcurrent on the driver chip is effectively prevented.
  • a display device including a display driving device, a backlight board and a display array
  • the display driving device includes a driving chip and an overcurrent protection circuit
  • the overcurrent protection circuit includes a voltage generation module, a voltage comparison module and a controlled switch module;
  • the first input terminal of the voltage comparison module is configured to access the logic signal
  • the second input terminal of the voltage comparison module is configured to access the logic signal through the voltage generation module
  • the output terminal of the voltage comparison module is connected to the controlled terminal of the controlled switch module
  • the input terminal of the controlled switch module is set to access logic signals, and the output terminal of the controlled switch module is set to the input terminal connected to the driver chip;
  • the voltage comparison module is configured to control the conduction of the input and output terminals of the controlled switch module through the controlled terminal when the voltage at the first input terminal is the same as the voltage at the second input terminal; otherwise, the controlled terminal controls the The input and output terminals are turned off;
  • the output end of the driving chip is set to output a driving signal to the display array
  • the backlight panel is configured to provide a light source to the display array.
  • the display array includes a liquid crystal display array.

Abstract

一种过流保护电路及显示驱动装置包括：在逻辑信号对应的前端输入电流出现过流时，防止过流的前端输入电流传输至驱动芯片，避免驱动芯片的损坏。

Description

过流保护电路及显示驱动装置
本申请要求于2018年10月29日提交中国专利局，申请号为2018112712452，申请名称为“过流保护电路及显示驱动装置”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
本申请涉及一种过流保护电路及显示驱动装置。
背景技术
液晶显示面板是由一定数量的彩色或黑白像素组成，放置于光源或反射面前方的显示设备。TFT-LCD(Thin Film Transistor Liquid Crystal Display薄膜晶体管液晶显示面板)是当前液晶显示面板的主要品种之一，已经成为了现代IT、视讯产品中重要的显示平台。以TFT-LCD的显示驱动为例，系统主板将R/G/B压缩信号、控制信号及电源通过线材与PCB板上的connector相连接，数据经过PCB板上的TCON(Timing Controller时序控制器)IC处理后，经PCB板，通过S-COF(Source-Chip on Film源级薄膜驱动芯片)和G-COF(Gate-Chip on Film栅极薄膜驱动芯片)与显示区连接，通过显示阵列上的Data line(数据线)和Scan line(扫描线)对电压进行传输，从而使TFT-LCD实现显示功能。即是说，在液晶显示面板中，前端输入的逻辑信号，需要经过相应驱动芯片转换成驱动信号。
但发明人意识到，因为前端输入异常或显示阵列异常，容易导致输入驱动芯片的电流过大，使得驱动芯片因过流损伤。
申请内容
根据本申请公开的各种实施例，提供一种过流保护电路及显示驱动装置。
一种过流保护电路，包括电压生成模块、电压比较模块和受控开关模块；
电压比较模块的第一输入端设置为接入逻辑信号，电压比较模块的第二输入端设置为通过电压生成模块接入逻辑信号，电压比较模块的输出端连接受控开关模块的受控端；
受控开关模块的输入端设置为接入逻辑信号，受控开关模块的输出端设置为连接驱动芯片的输入端；
电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过受控端控制 受控开关模块的输入端与输出端导通，否则通过受控端控制受控开关模块的输入端与输出端关断。
在其中一个实施例中，电压生成模块包括稳压电路；
稳压电路一端设置为接入逻辑信号，并连接第二输入端；
稳压电路的另一端设置为接地。
在其中一个实施例中，稳压电路包括稳压电容。
在其中一个实施例中，受控开关模块包括电子开关或场效应管；
受控开关模块的受控端为场效应管的栅极。
在其中一个实施例中，受控开关模块包括P沟道场效应管；
受控开关模块的受控端为P沟道场效应管的栅极，受控开关模块的输入端为P沟道场效应管的源极，受控开关模块的输出端为P沟道场效应管的漏极。
在其中一个实施例中，还包括偏置电阻；
P沟道场效应管的栅极通过偏置电阻连接P沟道场效应管的源极。
在其中一个实施例中，电压比较模块包括比较器；
电压比较模块的第一输入端为比较器的反相输入端，电压比较模块的第二输入端为比较器的同相输入端，电压比较模块的输出端为比较器的输出端。
在其中一个实施例中，电压比较模块还包括上升沿D触发器；
上升沿D触发器的控制端连接比较器的输出端，上升沿D触发器的脉冲输入端设置为接入预设高电平信号，上升沿D触发器的输出端为电压比较模块的输出端。
在其中一个实施例中，电压比较模块包括与非门电路；
电压比较模块的第一输入端为与非门电路的一输入端，电压比较模块的第二输入端为与非门电路的另一输入端，电压比较模块的输出端为与非门电路的输出端。
一种显示驱动装置，包括驱动芯片和过流保护电路；
过流保护电路包括电压生成模块、电压比较模块和受控开关模块；
电压比较模块的第一输入端设置为接入逻辑信号，电压比较模块的第二输入端设置为通过电压生成模块接入逻辑信号，电压比较模块的输出端连接受控开关模块的受控端；
受控开关模块的输入端设置为接入逻辑信号，受控开关模块的输出端设置为连接驱动 芯片的输入端；
电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过受控端控制受控开关模块的输入端与输出端导通，否则通过受控端控制受控开关模块的输入端与输出端关断；
驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号。
在其中一个实施例中，电压生成模块包括稳压电路；
稳压电路一端设置为接入逻辑信号，并连接第二输入端；
稳压电路的另一端设置为接地。
在其中一个实施例中，稳压电路包括稳压电容。
在其中一个实施例中，受控开关模块包括电子开关或场效应管；
受控开关模块的受控端为场效应管的栅极。
在其中一个实施例中，受控开关模块包括P沟道场效应管；
受控开关模块的受控端为P沟道场效应管的栅极，受控开关模块的输入端为P沟道场效应管的源极，受控开关模块的输出端为P沟道场效应管的漏极。
在其中一个实施例中，还包括偏置电阻；
P沟道场效应管的栅极通过偏置电阻连接P沟道场效应管的源极。
在其中一个实施例中，电压比较模块包括比较器；
电压比较模块的第一输入端为比较器的反相输入端，电压比较模块的第二输入端为比较器的同相输入端，电压比较模块的输出端为比较器的输出端。
在其中一个实施例中，电压比较模块还包括上升沿D触发器；
上升沿D触发器的控制端连接比较器的输出端，上升沿D触发器的脉冲输入端设置为接入预设高电平信号，上升沿D触发器的输出端为电压比较模块的输出端。
在其中一个实施例中，电压比较模块包括与非门电路；
电压比较模块的第一输入端为与非门电路的一输入端，电压比较模块的第二输入端为与非门电路的另一输入端，电压比较模块的输出端为与非门电路的输出端。
一种显示装置，包括显示驱动装置、背光板和显示阵列；
显示驱动装置包括驱动芯片和过流保护电路；
过流保护电路包括电压生成模块、电压比较模块和受控开关模块；
电压比较模块的第一输入端设置为接入逻辑信号，电压比较模块的第二输入端设置为通过电压生成模块接入逻辑信号，电压比较模块的输出端连接受控开关模块的受控端；
受控开关模块的输入端设置为接入逻辑信号，受控开关模块的输出端设置为连接驱动芯片的输入端；
电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过受控端控制受控开关模块的输入端与输出端导通，否则通过受控端控制受控开关模块的输入端与输出端关断；
驱动芯片的输出端设置为向显示阵列输出驱动信号；
背光板设置为给显示阵列提供光源。
在其中一个实施例中，显示阵列包括液晶显示阵列。
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。本申请的其它特征和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为根据一个或多个实施例中过流保护电路模块结构图；
图2为根据一个或多个实施例中过流保护电路图；
图3为根据一个或多个实施例中另一过流保护电路图；
图4为根据一个或多个实施例中显示驱动装置模块结构图。
具体实施方式
为了使本申请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，此处描述的具体实施例仅仅用以解释本申请，并不设置为限定本申请。
本发明实施例提供一种过流保护电路。
图1为根据一个或多个实施例中过流保护电路模块结构图，如图1所示，一实施方式的过流保护电路包括电压生成模块100、电压比较模块101和受控开关模块102；
电压比较模块101的第一输入端设置为接入逻辑信号，电压比较模块101的第二输入端设置为通过电压生成模块100接入逻辑信号，电压比较模块101的输出端连接受控开关模块的受控端；
在其中一个实施例中，接入的逻辑信号为前端输入的逻辑信号，一般是电压脉冲形式的电信号，由系统主板向驱动芯片进行传递。由于系统主板的功率恒定，在前端输入出现过流时，逻辑信号对应的电压会出现下降。在其中一个实施例中，电压生成模块100用根据正常逻辑信号对应的电压在电压比较模块101的第二输入端生成一个基准电压。作为一个较优的实施方式，基准电压与正常逻辑信号对应的电压相同。同时，在逻辑信号出现过流，逻辑信号对应的电压变小时，电压生成模块100生成的基准电压大小保持不变。
在其中一个实施例中，电压生成模块100包括稳压电路；
稳压电路一端设置为接入逻辑信号，并连接第二输入端；
稳压电路的另一端设置为接地。
在其中一个实施例中，在逻辑信号正常时，第二输入端的电压与第一输入端相同。在逻辑信号出现过流时，第一输出端的电压下降，第二输出端的电压由于稳压电路的稳压作用而保持不变。因此，在逻辑信号出现过流时，第一输入端与第二输出端出现电压差。
在其中一个实施例中，图2为根据一个或多个实施例中过流保护电路图，如图2所示，稳压电路包括稳压电容C1；
在其中一个实施例中，在逻辑信号正常时，稳压电容C1充电，在充电完毕后使第二输入端电压与第一输入端电压相同。在逻辑信号出现过流时，第一输入端电压下降，而稳压电容C1由于充电完成，稳压电容C1两端保持稳定的电压差，使第二输入端的电压保持不变。
在其中一个实施例中，稳压电路包括稳压二极管；
稳压二极管的负极设置为接入逻辑信号，并连接第二输入端；
稳压二极管的正极设置为接地。
受控开关模块102的输入端设置为接入逻辑信号，受控开关模块102的输出端设置为连接驱动芯片的输入端；
在其中一个实施例中，受控开关模块102的输入端与输出端导通时形成通路，逻辑信号可依次经受控开关模块102的输入端与输出端传递至驱动芯片的输入端。
电压比较模块101设置为在其第一输入端电压与第二输入端电压相同时，通过受控端控制受控开关模块102的输入端与输出端导通，否则通过受控端控制受控开关模块102的输入端与输出端关断。
在其中一个实施例中，电压比较模块101比较其第一输入端电压与第二输入端电压，根据比较结果输出一个电信号至受控开关模块102的受控端，以控制受控开关模块102的导通或关断。在其中一个实施例中，电压比较模块101在其第一输入端电压与第二输入端电压相同时，输出的电信号可使受控开关模块102的输入端与输出端导通；电压比较模块101在其第一输入端电压与第二输入端电压不同时，输出的电信号可使受控开关模块102的输入端与输出端关断。
在其中一个实施例中，受控开关模块102包括电子开关或场效应管；
在其中一个实施例中，受控开关模块102的受控端为场效应管的栅极。
在其中一个实施例中，以电子开关为例，电子开关的受控端接收电压比较模块101传递的电信号，根据预设逻辑控制其输入端与输出端导通或关断。以场效应管为例，电压比较模块101传递的电信号即可决定场效应管栅极电压的逻辑电平为高电平或低电平，以导通或关断源极和漏极。
在其中一个实施例中，如图2所示，受控开关模块102包括P沟道场效应管；
受控开关模块102的受控端为P沟道场效应管Q1的栅极，受控开关模块102的输入端为P沟道场效应管Q1的源极，受控开关模块102的输出端为P沟道场效应管Q1的漏极。
在其中一个实施例中，电压比较模块101在其第一输入端电压与第二输入端电压相同时，输出的电信号为低电平，P沟道场效应管Q1导通；电压比较模块101在其第一输入端电压与第二输入端电压不同时，输出的电信号为高电平，P沟道场效应管Q1关断。
在其中一个实施例中，如图2所示，还包括偏置电阻Rt；
P沟道场效应管Q1的栅极通过偏置电阻Rt连接P沟道场效应管Q1的源极。
在其中一个实施例中，P沟道场效应管Q1的栅极通过一偏置电阻Rt连接其源极。在其中一个实施例中，通过偏置电阻Rt，为场效应管提供偏置电压，更好地保持场效应管的工作特性
在其中一个实施例中，如图2所示，电压比较模块101包括比较器D1；
电压比较模块101的第一输入端为比较器D1的反相输入端，电压比较模块101的第二输入端为比较器D1的同相输入端，电压比较模块101的输出端为比较器D1的输出端。
在逻辑信号正常时，比较器D1的同相输入端电压与反相输入端电压相同，比较器D1输出低电平，使受控开关模块102的输入端与输出端导通；在逻辑信号过流时，比较器D1的同相输入端电压大于反向输入端电压，比较器D1输出高电平，使受控开关模块102的输入端与输出端关断。
作为一个较优的实施方式，如图2所示，电压比较模块101还包括上升沿D触发器D2；
上升沿D触发器D2的控制端C连接比较器D1的输出端，上升沿D触发器D2的脉冲输入端D设置为接入预设高电平信号，上升沿D触发器D2的输出端Q为电压比较模块101的输出端。
在其中一个实施例中，在逻辑信号正常时，比较器D1的同相输入端电压与反相输入端电压相同，比较器D1输出低电平，上升沿D触发器D2的控制端C接收到低电平，上升沿D触发器D2的输出端Q输出低电平，使受控开关模块102的输入端与输出端导通；在逻辑信号过流时，比较器D1的同相输入端电压大于反相输入端电压，比较器D1输出由低电平转为高电平，上升沿D触发器D2的控制端C接收到由低电平转为高电平的上升沿时，上升沿D触发器D2将其脉冲输入端D的预设高电平信号赋值给输出端Q，以控制受控开关模块102的输入端与输出端关断。在其中一个实施例中，通过预设高电平信号的预先设置，可满足不同受控开关模块102的工作特性，且可稳定地输出高电平以满足受控开关模块102的工作要求。
在其中一个实施例中，如图2所示，还包括第一保护电阻R1；
比较器D1的输出端设置为通过所述第一保护电阻R1接地。
在其中一个实施例中，如图2所示，还包括第二保护电阻R2；
上升沿D触发器D2的输出端Q设置为通过所述第二保护电阻R2接地。
在其中一个实施例中，图3为根据一个或多个实施例中另一过流保护电路图，如图3所示，电压比较模块101包括与非门电路D3；
电压比较模块101的第一输入端为与非门电路D3的一输入端，电压比较模块101的第二输入端为与非门电路D3的另一输入端，电压比较模块101的输出端为与非门电路D3的输出端。
在其中一个实施例中，在逻辑信号正常时，对应的电压为高电平电压1；在逻辑信号过流时，对应的电压为低电平电压0。在逻辑信号正常时，与非门电路输出低电平电压0，以使受控开关模块102的输入端与输出端间导通；在逻辑信号过流时，与非门电路输出高电平电压1，以使受控开关模块102的输入端与输出端间关断。
本发明实施例还提供一种显示驱动装置。
图4为根据一个或多个实施例中显示驱动装置模块结构图，如图4所示，显示驱动装置包括驱动芯片200和过流保护电路201；
过流保护电路201包括电压生成模块100、电压比较模块101和受控开关模块102；
电压比较模块101的第一输入端设置为接入逻辑信号，电压比较模块101的第二输入端设置为通过电压生成模块100接入逻辑信号，电压比较模块101的输出端连接受控开关模块102的受控端；
受控开关模块102的输入端设置为接入逻辑信号，受控开关模块102的输出端设置为连接驱动芯片200的输入端；
电压比较模块101设置为在其第一输入端电压与第二输入端电压相同时，通过受控端控制受控开关模块102的输入端与输出端导通，否则通过受控端控制受控开关模块102的输入端与输出端关断；
驱动芯片200的输出端设置为向液晶显示面板的显示阵列输出驱动信号。
上述过流保护电路及显示驱动装置，在逻辑信号对应的前端输入电流正常时，电压生成模块100使电压比较模块101的第一输入端与第二输入端电压相同，受控开关模块102的输入端与输出端导通，逻辑信号传输至驱动芯片进行正常的运行。在逻辑信号对应的前 端输入电流出现过流时，电压比较模块101的第一输入端的电压降低，而第二输入端的电压不变，此时电压比较模块101控制受控开关模块102的输入端与输出端关断，防止过流的前端输入电流传输至驱动芯片，避免驱动芯片的损坏。基于此，有效地防止过流对驱动芯片的影响。
本发明实施例还提供一种显示装置：
一种显示装置，包括显示驱动装置、背光板和显示阵列；
显示驱动装置包括驱动芯片和过流保护电路；
过流保护电路包括电压生成模块、电压比较模块和受控开关模块；
电压比较模块的第一输入端设置为接入逻辑信号，电压比较模块的第二输入端设置为通过电压生成模块接入逻辑信号，电压比较模块的输出端连接受控开关模块的受控端；
受控开关模块的输入端设置为接入逻辑信号，受控开关模块的输出端设置为连接驱动芯片的输入端；
电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过受控端控制受控开关模块的输入端与输出端导通，否则通过受控端控制受控开关模块的输入端与输出端关断；
驱动芯片的输出端设置为向显示阵列输出驱动信号；
背光板设置为给显示阵列提供光源。
在其中一个实施例中，显示阵列包括液晶显示阵列。
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。
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本申请专利范围的限制。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。

Claims (20)

  1. 一种过流保护电路，包括电压生成模块、电压比较模块和受控开关模块；
    所述电压比较模块的第一输入端设置为接入逻辑信号，所述电压比较模块的第二输入端设置为通过所述电压生成模块接入所述逻辑信号，所述电压比较模块的输出端连接所述受控开关模块的受控端；
    所述受控开关模块的输入端设置为接入逻辑信号，所述受控开关模块的输出端设置为连接驱动芯片的输入端；
    所述电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过所述受控端控制所述受控开关模块的输入端与输出端导通，否则通过所述受控端控制所述受控开关模块的输入端与输出端关断。
  2. 根据权利要求1所述的过流保护电路，其中，所述电压生成模块包括稳压电路；
    所述稳压电路一端设置为接入所述逻辑信号，并连接所述第二输入端；
    所述稳压电路的另一端设置为接地。
  3. 根据权利要求2所述的过流保护电路，其中，所述稳压电路包括稳压电容。
  4. 根据权利要求1所述的过流保护电路，其中，所述受控开关模块包括电子开关或场效应管；
    所述受控开关模块的受控端为所述场效应管的栅极。
  5. 根据权利要求4所述的过流保护电路，其中，所述受控开关模块包括P沟道场效应管；
    所述受控开关模块的受控端为所述P沟道场效应管的栅极，所述受控开关模块的输入端为所述P沟道场效应管的源极，所述受控开关模块的输出端为所述P沟道场效应管的漏极。
  6. 根据权利要求5所述的过流保护电路，还包括偏置电阻；
    所述P沟道场效应管的栅极通过所述偏置电阻连接所述P沟道场效应管的源极。
  7. 根据权利要求1所述的过流保护电路，其中，所述电压比较模块包括比较器；
    所述电压比较模块的第一输入端为所述比较器的反相输入端，所述电压比较模块的第二输入端为所述比较器的同相输入端，所述电压比较模块的输出端为所述比较器的输出 端。
  8. 根据权利要求7所述的过流保护电路，其中，所述电压比较模块还包括上升沿D触发器；
    所述上升沿D触发器的控制端连接所述比较器的输出端，所述上升沿D触发器的脉冲输入端设置为接入预设高电平信号，所述上升沿D触发器的输出端为所述电压比较模块的输出端。
  9. 根据权利要求1所述的过流保护电路，其中，所述电压比较模块包括与非门电路；
    所述电压比较模块的第一输入端为所述与非门电路的一输入端，所述电压比较模块的第二输入端为所述与非门电路的另一输入端，所述电压比较模块的输出端为所述与非门电路的输出端。
  10. 一种显示驱动装置，包括驱动芯片和过流保护电路；
    所述过流保护电路包括电压生成模块、电压比较模块和受控开关模块；
    所述电压比较模块的第一输入端设置为接入逻辑信号，所述电压比较模块的第二输入端设置为通过所述电压生成模块接入所述逻辑信号，所述电压比较模块的输出端连接所述受控开关模块的受控端；
    所述受控开关模块的输入端设置为接入逻辑信号，所述受控开关模块的输出端设置为连接所述驱动芯片的输入端；
    所述电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过所述受控端控制所述受控开关模块的输入端与输出端导通，否则通过所述受控端控制所述受控开关模块的输入端与输出端关断；
    所述驱动芯片的输出端设置为向液晶显示面板的显示阵列输出驱动信号。
  11. 根据权利要求10所述的显示驱动装置，其中，所述电压生成模块包括稳压电路；
    所述稳压电路一端设置为接入所述逻辑信号，并连接所述第二输入端；
    所述稳压电路的另一端设置为接地。
  12. 根据权利要求11所述的显示驱动装置，其中，所述稳压电路包括稳压电容。
  13. 根据权利要求10所述的显示驱动装置，其中，所述受控开关模块包括电子开关或场效应管；
    所述受控开关模块的受控端为所述场效应管的栅极。
  14. 根据权利要求13所述的显示驱动装置，其中，所述受控开关模块包括P沟道场效应管；
    所述受控开关模块的受控端为所述P沟道场效应管的栅极，所述受控开关模块的输入端为所述P沟道场效应管的源极，所述受控开关模块的输出端为所述P沟道场效应管的漏极。
  15. 根据权利要求14所述的显示驱动装置，还包括偏置电阻；
    所述P沟道场效应管的栅极通过所述偏置电阻连接所述P沟道场效应管的源极。
  16. 根据权利要求10所述的显示驱动装置，其中，所述电压比较模块包括比较器；
    所述电压比较模块的第一输入端为所述比较器的反相输入端，所述电压比较模块的第二输入端为所述比较器的同相输入端，所述电压比较模块的输出端为所述比较器的输出端。
  17. 根据权利要求16所述的显示驱动装置，其中，所述电压比较模块还包括上升沿D触发器；
    所述上升沿D触发器的控制端连接所述比较器的输出端，所述上升沿D触发器的脉冲输入端设置为接入预设高电平信号，所述上升沿D触发器的输出端为所述电压比较模块的输出端。
  18. 根据权利要求10所述的显示驱动装置，其中，所述电压比较模块包括与非门电路；
    所述电压比较模块的第一输入端为所述与非门电路的一输入端，所述电压比较模块的第二输入端为所述与非门电路的另一输入端，所述电压比较模块的输出端为所述与非门电路的输出端。
  19. 一种显示装置，包括显示驱动装置、背光板和显示阵列；
    所述显示驱动装置包括驱动芯片和过流保护电路；
    所述过流保护电路包括电压生成模块、电压比较模块和受控开关模块；
    所述电压比较模块的第一输入端设置为接入逻辑信号，所述电压比较模块的第二输入端设置为通过所述电压生成模块接入所述逻辑信号，所述电压比较模块的输出端连接所述 受控开关模块的受控端；
    所述受控开关模块的输入端设置为接入逻辑信号，所述受控开关模块的输出端设置为连接所述驱动芯片的输入端；
    所述电压比较模块设置为在其第一输入端电压与第二输入端电压相同时，通过所述受控端控制所述受控开关模块的输入端与输出端导通，否则通过所述受控端控制所述受控开关模块的输入端与输出端关断；
    所述驱动芯片的输出端设置为向所述显示阵列输出驱动信号；
    所述背光板设置为给所述显示阵列提供光源。
  20. 根据权利要求19所述的显示装置，其中，所述显示阵列包括液晶显示阵列。
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US20210027738A1 (en) 2021-01-28
CN109087613A (zh) 2018-12-25

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