WO2020113665A1 - 保护电路、供电电路和显示面板 - Google Patents

保护电路、供电电路和显示面板 Download PDF

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Publication number
WO2020113665A1
WO2020113665A1 PCT/CN2018/121564 CN2018121564W WO2020113665A1 WO 2020113665 A1 WO2020113665 A1 WO 2020113665A1 CN 2018121564 W CN2018121564 W CN 2018121564W WO 2020113665 A1 WO2020113665 A1 WO 2020113665A1
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Prior art keywords
power supply
feedback
voltage
circuit
resistor
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PCT/CN2018/121564
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English (en)
French (fr)
Inventor
张良
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HKC Co Ltd
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HKC Co Ltd
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Priority to US15/734,874 priority Critical patent/US11222610B2/en
Publication of WO2020113665A1 publication Critical patent/WO2020113665A1/zh
Anticipated expiration legal-status Critical
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3688Details of drivers for data electrodes suitable for active matrices only
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3696Generation of voltages supplied to electrode drivers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3685Details of drivers for data electrodes
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/042Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04Display protection
    • G09G2330/045Protection against panel overheating

Definitions

  • the present application relates to the field of display, in particular to a protection circuit, a power supply circuit and a display panel.
  • LCD TVs have been widely used because of their advantages of light weight, thin thickness and low power consumption. With the improvement of national living standards, LCD TVs with large size, high resolution and high frame rate are becoming more and more popular.
  • the current of the data driving chip in the liquid crystal panel is getting larger and higher, the temperature is getting higher and higher, and the temperature resistance limit of the chip is getting closer and closer, so how to deal with abnormal situations Therefore, protecting the data driver chip from burning has become an urgent problem to be solved.
  • the over-current protection function is set in the power integrated chip on the LCD TV drive board, but because the output of the power integrated chip is now for all the data drive chips in the LCD panel, plus the large number of data drive chips, the power IC cannot Accurately sense the current consumption of each one, so it often happens that individual data driver chips burn out.
  • the present application provides a protection circuit, a power supply circuit, and a display panel to solve the problem that the data driving chip is burned out due to its internal temperature being too high.
  • An embodiment of the present application provides a protection circuit, including:
  • the first input terminal is connected to the power supply, and the second input terminal is grounded, used for receiving the power supply voltage, adjusting its first total resistance value according to the temperature of the data driving chip, and according to the power supply voltage and the adjusted The first total resistance value generates a feedback voltage;
  • the first input terminal is connected to the power supply and the first input terminal of the feedback circuit
  • the second input terminal is connected to the output terminal of the feedback circuit for receiving the power supply voltage and the feedback voltage And generate a driving current according to the feedback voltage and the power supply voltage, and provide it to the data driving chip, wherein the driving current decreases as the temperature of the data driving chip increases.
  • the feedback circuit includes:
  • the first feedback branch the first input terminal is connected to the power supply, and the second input terminal is grounded, used to receive the power supply voltage, adjust its third total resistance value according to the temperature of the data driving chip, and according to the power supply
  • the voltage and the adjusted third total resistance value generate a feedback control voltage, wherein when the temperature of the data driving chip increases, the third total resistance value decreases and the feedback control voltage decreases;
  • the first input terminal is connected to the power supply and the first input terminal of the first feedback branch
  • the second input terminal is connected to the output terminal of the first feedback branch
  • the output terminal is connected to all
  • the second input terminal of the current adjustment circuit is connected to receive the power supply voltage and the feedback control voltage output by the first feedback branch, adjust its own fourth total resistance value according to the feedback control voltage, according to the The power supply voltage and the adjusted fourth total resistance value generate the feedback voltage and output to the current adjustment circuit, where the feedback voltage increases as the feedback control voltage decreases.
  • the first feedback branch includes:
  • a first resistor one end is connected to the power supply, and the other end is connected to the second input end of the second feedback branch;
  • the thermistor has one end connected to the first resistance and the second input end of the second feedback branch, and the other end is grounded.
  • the second feedback branch includes:
  • a second resistor one end is connected to the power supply, and the other end is connected to the second input end of the current adjustment circuit;
  • a third resistor one end is connected to the second resistor and the second input end of the current adjustment circuit, and the other end is connected to the drain of the first switch tube;
  • the gate is connected to the first resistor and the thermistor, the drain is connected to the third resistor, and the source is grounded.
  • the thermistor is a negative temperature coefficient thermistor.
  • the current adjustment circuit includes a second switch tube, a gate is connected to the second resistor and the third resistor, a source is connected to the second resistor and the power supply voltage, and the drain The pole is connected to the data driving chip.
  • the feedback circuit includes:
  • the first feedback branch the first input terminal is connected to the power supply, and the second input terminal is grounded, used to receive the power supply voltage, adjust its third total resistance value according to the temperature of the data driving chip, and according to the power supply voltage and The adjusted third total resistance value generates a feedback control voltage, wherein when the temperature of the data driving chip increases, the third total resistance value decreases and the feedback control voltage increases;
  • the first input terminal is connected to the power supply and the first input terminal of the first feedback branch
  • the second input terminal is connected to the output terminal of the first feedback branch
  • the output terminal is connected to all
  • the second input terminal of the current adjustment circuit is connected to receive the power supply voltage and the feedback control voltage output by the first feedback branch, adjust its own fourth total resistance value according to the feedback control voltage, according to the The power supply voltage and the adjusted fourth total resistance value generate the feedback voltage and output to the current adjustment circuit, wherein the feedback voltage increases as the feedback control voltage increases.
  • the first feedback branch includes:
  • a thermistor one end is connected to the power supply, and the other end is connected to the second input end of the second feedback branch;
  • One end of the first resistor is connected to the first resistor and the second input end of the second feedback branch, and the other end is grounded.
  • the second feedback branch includes:
  • a second resistor one end is connected to the power supply, and the other end is connected to the second input end of the current adjustment circuit;
  • a third resistor one end is connected to the second resistor and the second input end of the current adjustment circuit, and the other end is connected to the source of the first switch tube;
  • the gate is connected to the first resistor and the thermistor, the source is connected to the third resistor, and the drain is grounded.
  • the current adjustment circuit includes a second switch tube, a gate is connected to the second resistor and the third resistor, a source is connected to the second resistor and the power supply voltage, and the drain The pole is connected to the data driving chip.
  • the present application also provides a power supply circuit, the power supply circuit includes a power supply and a protection circuit; wherein the protection circuit includes:
  • the first input terminal is connected to the power supply and the first input terminal of the feedback circuit
  • the second input terminal is connected to the output terminal of the feedback circuit for receiving the power supply voltage and the feedback voltage , Generating a driving current according to the feedback voltage and the power supply voltage, and providing it to the data driving chip, wherein the driving current decreases as the temperature of the data driving chip increases.
  • the first feedback branch the first input terminal is connected to the power supply, and the second input terminal is grounded, used for receiving the power supply voltage, and adjusting its third total resistance according to the temperature of the data driving chip Value, and generate a feedback control voltage according to the power supply voltage and the adjusted third total resistance value, wherein when the temperature of the data driving chip increases, the third total resistance value decreases, the feedback The control voltage is reduced;
  • the first input terminal is connected to the power supply and the first input terminal of the first feedback branch
  • the second input terminal is connected to the output terminal of the first feedback branch
  • the output terminal is connected to all
  • the second input terminal of the current adjustment circuit is connected to receive the power supply voltage and the feedback control voltage output by the first feedback branch, adjust its own fourth total resistance value according to the feedback control voltage, according to the The power supply voltage and the adjusted fourth total resistance value generate the feedback voltage and output to the current adjustment circuit, where the feedback voltage increases as the feedback control voltage decreases.
  • the first feedback branch includes:
  • a first resistor one end is connected to the power supply, and the other end is connected to the second input end of the second feedback branch;
  • the thermistor has one end connected to the first resistance and the second input end of the second feedback branch, and the other end is grounded.
  • the second feedback branch includes:
  • a second resistor one end is connected to the power supply, and the other end is connected to the second input end of the current adjustment circuit;
  • a third resistor one end is connected to the second resistor and the second input end of the current adjustment circuit, and the other end is connected to the drain of the first switch tube;
  • the gate is connected to the first resistor and the thermistor, the drain is connected to the third resistor, and the source is grounded.
  • the thermistor is a negative temperature coefficient thermistor.
  • the feedback circuit includes:
  • the first feedback branch the first input terminal is connected to the power supply, and the second input terminal is grounded, used to receive the power supply voltage, adjust its third total resistance value according to the temperature of the data driving chip, and according to the power supply voltage
  • the adjusted third total resistance value generates a feedback control voltage, wherein when the temperature of the data driving chip increases, the third total resistance value decreases and the feedback control voltage increases;
  • the first input terminal is connected to the power supply and the first input terminal of the first feedback branch
  • the second input terminal is connected to the output terminal of the first feedback branch
  • the output terminal is connected to all
  • the second input terminal of the current adjustment circuit is connected to receive the power supply voltage and the feedback control voltage output by the first feedback branch, adjust its own fourth total resistance value according to the feedback control voltage, according to the The power supply voltage and the adjusted fourth total resistance value generate the feedback voltage and output to the current adjustment circuit, wherein the feedback voltage increases as the feedback control voltage increases.
  • the first feedback branch includes:
  • a thermistor one end is connected to the power supply, and the other end is connected to the second input end of the second feedback branch;
  • One end of the first resistor is connected to the first resistor and the second input end of the second feedback branch, and the other end is grounded.
  • the second feedback branch includes:
  • a second resistor one end is connected to the power supply, and the other end is connected to the second input end of the current adjustment circuit;
  • a third resistor one end is connected to the second resistor and the second input end of the current adjustment circuit, and the other end is connected to the source of the first switch tube;
  • the gate is connected to the first resistor and the thermistor, the source is connected to the third resistor, and the drain is grounded.
  • the current adjustment circuit includes a second switch tube, a gate is connected to the second resistor and the third resistor, a source is connected to the second resistor and the power supply voltage, and the drain The pole is connected to the data driving chip.
  • the present application also provides a display panel, including:
  • the peripheral circuit area is used to supply power and drive signals to the display area, and the peripheral circuit area includes a protection circuit;
  • the power supply circuit includes:
  • the first input terminal is connected to the power supply, and the second input terminal is grounded, used for receiving the power supply voltage, adjusting its first total resistance value according to the temperature of the data driving chip, and according to the power supply voltage and the adjusted The first total resistance value generates a feedback voltage;
  • the first input terminal is connected to the power supply and the first input terminal of the feedback circuit
  • the second input terminal is connected to the output terminal of the feedback circuit for receiving the power supply voltage and the feedback voltage , Generating a driving current according to the feedback voltage and the power supply voltage, and providing it to the data driving chip, wherein the driving current decreases as the temperature of the data driving chip increases.
  • this application provides a protection circuit, a power supply circuit, and a display panel.
  • the protection circuit includes a feedback circuit and a current adjustment circuit.
  • the first input terminal of the feedback circuit is connected to the power supply, and the second input terminal of the feedback circuit is grounded for receiving the power supply voltage, adjusting its first total resistance value according to the temperature of the data driving chip, and according to the The power supply voltage and the adjusted first total resistance value generate a feedback voltage.
  • the first input end of the current adjustment circuit is connected to the power supply and the first input end of the feedback circuit
  • the second input end of the current adjustment circuit is connected to the output end of the feedback circuit
  • the current adjustment The circuit is used to receive the power supply voltage and the feedback voltage, generate a driving current according to the feedback voltage and the power supply voltage, and provide it to the data driving chip, wherein the driving current varies with the temperature of the data driving chip Increase and decrease.
  • the feedback circuit generates a feedback voltage according to the temperature of the data driving chip, so that the current adjustment circuit adjusts the output driving current according to the feedback circuit, wherein when the temperature of the data driving chip rises When it is high, the driving current is reduced, and the thermal energy consumption of the data driving chip is reduced, thereby preventing the data driving chip from being burned due to an excessively high internal temperature.
  • FIG. 1 is a schematic structural diagram of a driving structure of a liquid crystal panel
  • FIG. 2 is a schematic structural diagram of a protection circuit provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of another protection circuit provided by an embodiment of the present application.
  • FIG. 1 In the current overall drive architecture of the common ultra-high-definition LCD panel, there are a total of 16 gate drive chips and 12 data drive chips on both sides.
  • the drive board is responsible for power output and signal output.
  • the power IC detects the total power supply current of all 12 data driver chips. If only some of the data driver chips have excessive current, it may not trigger the overcurrent protection of the power IC, but for abnormal ICs In other words, it may quickly reach the temperature limit and burn.
  • the present application provides a protection circuit 10 that includes a feedback circuit 100 and a current adjustment circuit 200.
  • the first input terminal of the feedback circuit 100 is connected to the power supply, and the second input terminal of the feedback circuit 100 is grounded.
  • the feedback circuit 100 is used to receive the power supply voltage and adjust its first total resistance according to the temperature of the data driving chip Value, and generate a feedback voltage according to the power supply voltage and the adjusted first total resistance value.
  • the first input end of the current adjustment circuit 200 is connected to the power supply and the first input end of the feedback circuit 100, and the second input end of the current adjustment circuit 200 is connected to the output end of the feedback circuit 100,
  • the current adjustment circuit 200 is used to receive the power supply voltage and the feedback voltage, generate a drive current according to the feedback voltage and the power supply voltage, and provide it to the data driving chip, wherein the drive current varies with the The temperature of the data driving chip increases and decreases.
  • the feedback circuit 100 generates a feedback voltage according to the temperature of the data driving chip, so that the current adjustment circuit 200 adjusts the output drive current according to the feedback circuit 100, wherein when the When the temperature of the data driving chip is increased, the driving current is reduced, and the thermal energy consumption of the data driving chip is reduced, thereby preventing the data driving chip from being burned due to an excessively high internal temperature.
  • the feedback circuit 100 includes a first feedback branch 110 and a second feedback branch 120.
  • the first input terminal of the first feedback branch 110 is connected to the power supply, and the second input terminal of the first feedback branch 110 is grounded.
  • the first feedback branch 110 is used to receive the power supply voltage, adjust its own third total resistance value according to the temperature of the data driving chip, and according to the power supply voltage and the adjusted third total resistance value A feedback control voltage is generated, wherein when the temperature of the data driving chip increases, the third total resistance value decreases, and the feedback control voltage decreases.
  • the first input terminal of the second feedback branch 120 is connected to the power supply and the first input terminal of the first feedback branch 110, and the second input terminal of the second feedback branch 120 is connected to the first
  • the output terminal of a feedback branch 110 is connected, and the output terminal of the second feedback branch 120 is connected to the second input terminal of the current adjustment circuit 200.
  • the second feedback branch 120 is used to receive the power supply voltage and the feedback control voltage output by the first feedback branch 110, adjust its own fourth total resistance according to the feedback control voltage, and according to the power supply voltage And the adjusted fourth total resistance value generates the feedback voltage and outputs it to the current adjustment circuit 200, where the feedback voltage increases as the feedback control voltage decreases.
  • the first feedback branch 110 includes a first resistor R1 and a thermistor Rtemp.
  • one end of the first resistor R1 is connected to the power supply, and the other end of the first resistor R1 is connected to the second input end of the second feedback branch 120.
  • One end of the thermistor Rtemp is connected to the first resistor R1 and the second input end of the second feedback branch 120, and the other end of the thermistor Rtemp is grounded.
  • the resistance value of the thermistor Rtemp becomes smaller, and the third total resistance value of the first feedback branch 110 (equal to the first resistance R1 and The sum of the resistance values of the thermistor Rtemp becomes smaller, the current through the first feedback branch 110 increases, the voltage across the first resistor R1 increases, and the corresponding voltage across the thermistor Rtemp Reduced, the feedback control voltage is equal to the voltage across the thermistor Rtemp, so the feedback control voltage becomes smaller.
  • the resistance value of the thermistor Rtemp becomes larger, the third total resistance value of the first feedback branch 110 becomes larger, and through the first feedback branch 110
  • the current decreases, the voltage across the first resistor R1 decreases, the corresponding voltage across the thermistor Rtemp increases, the feedback control voltage is equal to the voltage across the thermistor Rtemp, so the feedback The control voltage increases.
  • the second feedback branch 120 includes a second resistor R2, a third resistor R3, and a first switch M1.
  • One end of the second resistor R2 is connected to the power supply, and the other end of the second resistor R2 is connected to the second input end of the current adjustment circuit 200.
  • One end of the third resistor R3 is connected to the second resistor R2 and the second input end of the current adjustment circuit 200, and the other end of the third resistor R3 is connected to the drain of the first switch M1.
  • the gate of the first switch M1 is connected to the first resistor R1 and the thermistor Rtemp, the drain of the first switch M1 is connected to the third resistor R3, the first The source of the switch M1 is grounded.
  • the fourth total resistance of the second feedback branch 120 (equal to the sum of the resistance of the second resistor R2, the resistance of the third resistor R3 and the on-resistance of the first switch M1) increases, and the The current in the second feedback circuit 100 becomes smaller, and the voltage across the second resistor R2 becomes smaller.
  • the feedback voltage is equal to the voltage across the third resistor R3 and the first switch M1, that is, equal to the difference between the power supply voltage and the voltage across the second resistor R2, so when the second resistor The voltage across R2 becomes smaller and the feedback voltage increases.
  • the current adjustment circuit 200 includes a second switch M2, a gate is connected to the second resistor R2 and the third resistor R3, and a source is connected to the second resistor R2 and the power supply voltage The drain is connected to the data driving chip.
  • the resistance of the thermistor Rtemp decreases as the temperature increases, so the thermistor Rtemp can be used to detect the temperature of the data driving chip as a temperature sensing device.
  • the thermistor Rtemp should be disposed inside the data driving chip, or the thermistor Rtemp should be disposed close to the data driving chip Position, the position of other components can be set according to actual needs.
  • the first resistor R1, the thermistor Rtemp and the first switch tube M1 are packaged inside the data driving chip.
  • the first resistor R1, the second resistor R2, and the third resistor R3 are all ordinary resistors with a fixed resistance
  • the first switch tube M1 is an N-type field effect tube.
  • the second switch tube M2 is a P-type field effect tube.
  • the Rtemp When the data driving chip is in a normal temperature state, the Rtemp is larger, the voltage VRtemp across the thermistor Rtemp is higher, the gate voltage of the first field effect transistor is higher, and the The on-resistance is small and the on-state is good.
  • the power supply is grounded through the second resistor R2, the third resistor R3, and the first switch tube M1.
  • the feedback voltage Vf VAA*(R3+RN1)/(R2+R3+RN1), Vf ⁇ VAA
  • the second switch M2 is turned on.
  • the power supply normally supplies power to the data driving chip.
  • the Rtemp decreases
  • the feedback control voltage decreases
  • the on-resistance of the first field effect transistor increases
  • the feedback voltage Vf increases
  • the The voltage difference between the gate and source of the second switch M2 (equal to VAA-Vf) decreases
  • the on-resistance RN2 of the second switch M2 increases
  • the drive current output by the voltage adjustment circuit decreases It is small, thereby reducing the thermal energy consumption of the data driving chip.
  • the thermistor Rtemp has a self-recovery characteristic.
  • the resistance value of the thermistor Rtemp also returns to normal, and the power supply of the data driving chip also returns to normal. Therefore, the protection circuit 10 provided by the present application can automatically track temperature changes and adapt to different working states, thereby providing durable protection for the data driving chip.
  • the thermistor Rtemp is a negative temperature coefficient thermistor Rtemp.
  • the resistance of the negative temperature absorption thermistor Rtemp will decrease as the temperature increases, thereby reducing the power consumption of the protection circuit 10.
  • the feedback circuit 100 includes a first feedback branch 110 and a second feedback branch 120.
  • the first input terminal of the first feedback branch 110 is connected to the power supply, the second input terminal of the first feedback branch 110 is grounded, and the first feedback branch 110 is used to receive the power supply voltage, according to the data
  • the temperature of the driving chip adjusts its third total resistance value, and generates a feedback control voltage according to the power supply voltage and the adjusted third total resistance value, wherein when the temperature of the data driving chip increases, the The third total resistance value decreases, and the feedback control voltage increases.
  • the first input terminal of the second feedback branch 120 is connected to the power supply and the first input terminal of the first feedback branch 110, and the second input terminal of the second feedback branch 120 is connected to the first An output terminal of a feedback branch 110 is connected, an output terminal of the second feedback branch 120 is connected to a second input terminal of the current adjustment circuit 200, and the second feedback branch 120 is used to receive the power supply voltage And the feedback control voltage output by the first feedback branch 110, adjust its own fourth total resistance value according to the feedback control voltage, and generate the feedback according to the power supply voltage and the adjusted fourth total resistance value And output the voltage to the current adjustment circuit 200, wherein the feedback voltage increases as the feedback control voltage increases.
  • the first feedback branch 110 includes a thermistor Rtemp and a first resistor R1:
  • One end of the thermistor Rtemp is connected to the power supply, and the other end of the thermistor Rtemp is connected to the second input end of the second feedback branch 120.
  • One end of the first resistor R1 is connected to the first resistor R1 and the second input terminal of the second feedback branch 120, and the other end of the first resistor R1 is grounded.
  • the resistance value of the thermistor Rtemp becomes smaller, and the third total resistance value of the first feedback branch 110 (equal to the first resistance R1 and The sum of the resistance values of the thermistor Rtemp becomes smaller, the current through the first feedback branch 110 increases, the voltage across the first resistor R1 increases, and the feedback control voltage is equal to the first The voltage across the resistor R1, so the feedback control voltage increases.
  • the second feedback branch 120 includes a second resistor R2, a third resistor R3 and a first switch M1:
  • One end of the second resistor R2 is connected to the power supply, and the other end of the second resistor R2 is connected to the second input end of the current adjustment circuit 200.
  • One end of the third resistor R3 is connected to the second resistor R2 and the second input terminal of the current adjustment circuit 200, and the other end of the third resistor R3 is connected to the source of the first switch M1.
  • the gate of the first switch M1 is connected to the first resistor R1 and the thermistor Rtemp, the source of the first switch M1 is connected to the third resistor R3, the first The drain of the switch M1 is grounded.
  • the fourth total resistance of the second feedback branch 120 (equal to the sum of the resistance of the second resistor R2, the resistance of the third resistor R3 and the on-resistance of the first switch M1) increases, so The current in the second feedback circuit 100 becomes smaller, and the voltage across the second resistor R2 becomes smaller.
  • the feedback voltage is equal to the voltage across the third resistor R3 and the first switch M1, that is, equal to the difference between the power supply voltage and the voltage across the second resistor R2, so when the second resistor The voltage across R2 becomes smaller and the feedback voltage increases.
  • the first resistor R1, the second resistor R2, and the third resistor R3 are all ordinary resistors with a fixed resistance
  • the first switch tube M1 and the second switch tube M2 are both P-type field effect tube.
  • the Rtemp When the data driving chip is in a normal temperature state, the Rtemp is larger, the voltage VRtemp across the thermistor Rtemp is higher, the gate voltage of the first field effect transistor is smaller, and the first field effect transistor is turned on
  • the impedance RN1 is small and the conduction state is good.
  • the power supply is grounded through the second resistor R2, the third resistor R3, and the first switch tube M1.
  • the feedback voltage Vf VAA*(R3+RN1)/(R2+R3+RN1), Vf ⁇ VAA, this When the second switch tube M2 is turned on, the power supply normally supplies the data driving chip.
  • the Rtemp decreases, the feedback control voltage increases, the on-resistance of the first field effect transistor increases, the feedback voltage Vf increases, the The voltage difference (equal to VAA-Vf) between the gate and the source of the second switch M2 decreases, the on-resistance RN2 of the second switch M2 increases, and the drive current output by the voltage adjustment circuit decreases It is small, thereby reducing the thermal energy consumption of the data driving chip.
  • the voltage across the thermistor Rtemp is close to 0, the gate voltage of the first switch M1 is VAA, and the first The switch M1 is turned off, the feedback voltage is equal to the power supply voltage VAA, the voltage difference between the gate and the source of the second switch M2 is 0, the second switch M2 will also be cut off, and the power is no longer Power supply for the data driving chip, the data driving chip stops working, avoiding the serious consequences of being burnt out.
  • the present application also provides a power supply circuit, which includes a power supply and a protection circuit.
  • the power supply circuit can be used in the overall driving structure of the ultra-high-definition liquid crystal panel to prevent the data driving chip from being burnt out.
  • the protection circuit includes:
  • the feedback circuit 100 and the current adjustment circuit 200 are The feedback circuit 100 and the current adjustment circuit 200.
  • the first input terminal of the feedback circuit 100 is connected to the power supply, and the second input terminal of the feedback circuit 100 is grounded.
  • the feedback circuit 100 is used to receive the power supply voltage and adjust its first total resistance according to the temperature of the data driving chip Value, and generate a feedback voltage according to the power supply voltage and the adjusted first total resistance value.
  • the first input end of the current adjustment circuit 200 is connected to the power supply and the first input end of the feedback circuit 100, and the second input end of the current adjustment circuit 200 is connected to the output end of the feedback circuit 100,
  • the current adjustment circuit 200 is used to receive the power supply voltage and the feedback voltage, generate a drive current according to the feedback voltage and the power supply voltage, and provide it to the data driving chip, wherein the drive current varies with the The temperature of the data driving chip increases and decreases.
  • the feedback circuit 100 includes a first feedback branch 110 and a second feedback branch 120.
  • the first input terminal of the first feedback branch 110 is connected to the power supply, and the second input terminal of the first feedback branch 110 is grounded.
  • the first feedback branch 110 is used to receive the power supply voltage, adjust its third total resistance value according to the temperature of the data driving chip, and according to the power supply voltage and the adjusted third total resistance value A feedback control voltage is generated, wherein when the temperature of the data driving chip increases, the third total resistance value decreases, and the feedback control voltage decreases.
  • the first input terminal of the second feedback branch 120 is connected to the power supply and the first input terminal of the first feedback branch 110, and the second input terminal of the second feedback branch 120 is connected to the first
  • the output terminal of a feedback branch 110 is connected, and the output terminal of the second feedback branch 120 is connected to the second input terminal of the current adjustment circuit 200.
  • the second feedback branch 120 is used to receive the power supply voltage and the feedback control voltage output by the first feedback branch 110, adjust its own fourth total resistance according to the feedback control voltage, and according to the power supply voltage And the adjusted fourth total resistance value generates the feedback voltage and outputs it to the current adjustment circuit 200, where the feedback voltage increases as the feedback control voltage decreases.
  • the first feedback branch 110 includes a first resistor R1 and a thermistor Rtemp.
  • One end of the first resistor R1 is connected to the power supply, and the other end of the first resistor R1 is connected to the second input terminal of the second feedback branch 120.
  • One end of the thermistor Rtemp is connected to the first resistor R1 and the second input end of the second feedback branch 120, and the other end of the thermistor Rtemp is grounded.
  • the second feedback branch 120 includes a second resistor R2, a third resistor R3 and a first switch M1.
  • One end of the second resistor R2 is connected to the power supply, and the other end of the second resistor R2 is connected to the second input end of the current adjustment circuit 200.
  • One end of the third resistor R3 is connected to the second resistor R2 and the second input end of the current adjustment circuit 200, and the other end of the third resistor R3 is connected to the drain of the first switch M1.
  • the gate of the first switch M1 is connected to the first resistor R1 and the thermistor Rtemp, the drain of the first switch M1 is connected to the third resistor R3, the first The source of the switch M1 is grounded.
  • the current adjustment circuit 200 includes a second switch M2, a gate is connected to the second resistor R2 and the third resistor R3, and a source is connected to the second resistor R2 and the power supply voltage The drain is connected to the data driving chip.
  • the first input terminal of the first feedback branch 110 is connected to a power source, the second input terminal of the first feedback branch 110 is grounded, and the first feedback branch 110 is used to receive
  • the power supply voltage adjusts its third total resistance value according to the temperature of the data driving chip, and generates a feedback control voltage according to the power supply voltage and the adjusted third total resistance value.
  • the third total resistance value decreases, and the feedback control voltage increases.
  • the first input terminal of the second feedback branch 120 is connected to the power supply and the first input terminal of the first feedback branch 110, and the second input terminal of the second feedback branch 120 is connected to the first An output terminal of a feedback branch 110 is connected, an output terminal of the second feedback branch 120 is connected to a second input terminal of the current adjustment circuit 200, and the second feedback branch 120 is used to receive the power supply voltage And the feedback control voltage output by the first feedback branch 110, adjust its own fourth total resistance value according to the feedback control voltage, and generate the feedback according to the power supply voltage and the adjusted fourth total resistance value And output the voltage to the current adjustment circuit 200, wherein the feedback voltage increases as the feedback control voltage increases.
  • the first feedback branch 110 includes a thermistor Rtemp and a first resistor R1.
  • One end of the thermistor Rtemp is connected to the power supply, and the other end of the thermistor Rtemp is connected to the second input end of the second feedback branch 120.
  • One end of the first resistor R1 is connected to the first resistor R1 and the second input terminal of the second feedback branch 120, and the other end of the first resistor R1 is grounded.
  • the second feedback branch 120 includes a second resistor R2, a third resistor R3 and a first switch M1.
  • One end of the second resistor R2 is connected to the power supply, and the other end of the second resistor R2 is connected to the second input terminal of the current adjustment circuit 200.
  • One end of the third resistor R3 is connected to the second resistor R2 and the second input terminal of the current adjustment circuit 200, and the other end of the third resistor R3 is connected to the source of the first switch M1.
  • the gate of the first switch M1 is connected to the first resistor R1 and the thermistor Rtemp, the source of the first switch M1 is connected to the third resistor R3, the first The drain of the switch M1 is grounded.
  • the present application also provides a display panel.
  • the display panel includes a display area and a peripheral circuit area.
  • the display area is used for display.
  • the peripheral circuit area is used to supply power and drive signals to the display area, and the peripheral circuit area includes a protection circuit.
  • the power supply circuit includes a feedback circuit 100 and a current adjustment circuit 200.
  • the first input terminal of the feedback circuit 100 is connected to the power supply, and the second input terminal of the feedback circuit 100 is grounded.
  • the feedback circuit 100 is used to receive the power supply voltage and adjust its first total resistance according to the temperature of the data driving chip Value, and generate a feedback voltage according to the power supply voltage and the adjusted first total resistance value.
  • the first input end of the current adjustment circuit 200 is connected to the power supply and the first input end of the feedback circuit 100, and the second input end of the current adjustment circuit 200 is connected to the output end of the feedback circuit 100,
  • the current adjustment circuit 200 is used to receive the power supply voltage and the feedback voltage, generate a drive current according to the feedback voltage and the power supply voltage, and provide it to the data driving chip, wherein the drive current varies with the The temperature of the data driving chip increases and decreases.
  • the protection circuit 10 includes a feedback circuit 100 and a current adjustment circuit 200.
  • the first input terminal of the feedback circuit 100 is connected to the power supply, the second input terminal of the feedback circuit 100 is grounded, and is used to receive the power supply voltage, adjust its first total resistance value according to the temperature of the data driving chip, and A feedback voltage is generated according to the power supply voltage and the adjusted first total resistance value.
  • the first input end of the current adjustment circuit 200 is connected to the power supply and the first input end of the feedback circuit 100, and the second input end of the current adjustment circuit 200 is connected to the output end of the feedback circuit 100,
  • the current adjustment circuit 200 is used to receive the power supply voltage and the feedback voltage, generate a drive current according to the feedback voltage and the power supply voltage, and provide it to the data driving chip, wherein the drive current varies with the The temperature of the data driving chip increases and decreases.
  • the feedback circuit 100 generates a feedback voltage according to the temperature of the data driving chip, so that the current adjustment circuit 200 adjusts the output driving current according to the feedback circuit 100, wherein when the data drives the chip When the temperature rises, the driving current is reduced, and the thermal energy consumption of the data driving chip is reduced, thereby preventing the data driving chip from being burned due to an excessively high internal temperature.

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Abstract

一种保护电路(10)、供电电路和显示面板。所述保护电路(10)包括反馈电路(100)和电流调整电路(200)。反馈电路(100)用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据电源电压和调整后的第一总阻值生成反馈电压。电流调整电路(200)用于接收电源电压和反馈电压,根据反馈电压和电源电压生成并输出驱动电流,驱动电流随数据驱动芯片的温度升高而减小,驱动电流减小,数据驱动芯片的热能功耗降低以避免因其内部温度过高被烧坏。

Description

保护电路、供电电路和显示面板 技术领域
本申请涉及显示领域,尤其涉及一种保护电路、供电电路和显示面板。
背景技术
这里的陈述仅提供与本申请有关的背景信息,而不必然地构成现有技术。
液晶电视因其具有重量轻、厚度薄和功耗小等优点,已被广泛应用。随着国民生活水平的提高,具备大尺寸、高解析度和高帧频的液晶电视愈来愈受欢迎。但随着这些技术指标的升高,液晶面板中的数据驱动芯片的电流越来越大,温度越来越高,距离芯片的耐温极限也越来越近,因此如何在发生异常的情形下,保护数据驱动芯片免于烧毁成为了当前急需解决的问题。
目前液晶电视驱动板上的电源集成芯片中设置了过流保护功能,但是由于现在电源集成芯片的输出是针对液晶面板中所有的数据驱动芯片,再加上数据驱动芯片数量较多,电源IC无法精准的感知每一颗的电流消耗情况,因此经常会发生有个别数据驱动芯片烧毁的情况。
发明内容
基于此,本申请提供了一种保护电路、供电电路和显示面板以解决数据驱动芯片因其内部温度过高而被烧坏的问题,。
本申请实施例提供了一种保护电路,包括:
反馈电路,第一输入端与电源连接,第二输入端接地,用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压;以及
电流调整电路,第一输入端与所述电源以及所述反馈电路的第一输入端连接,第二输入端与所述反馈电路的输出端连接,用于接收所述电源电压和 所述反馈电压,并根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
在其中一个实施例中,所述反馈电路包括:
第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据所述数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压减小;以及
第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的减小而增大。
在其中一个实施例中,所述第一反馈支路包括:
第一电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
热敏电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
本申请提供的一些实施例中,所述第二反馈支路包括:
第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的漏极连接;以及
所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,漏极与所述第三电阻的连接,源极接地。
在其中一个实施例中,所述热敏电阻为负温度系数热敏电阻。
在其中一个实施例中,所述电流调整电路包括第二开关管,栅极与所述第二电阻以及所述第三电阻连接,源极与所述第二电阻以及所述电源电压连接,漏极与所述数据驱动芯片连接。
在其中一个实施例中,所述反馈电路包括:
第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所 述电源电压,根据数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压增大;以及
第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的增大而增大。
在其中一个实施例中,所述第一反馈支路包括:
热敏电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
第一电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
在其中一个实施例中,所述第二反馈支路包括:
第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的源极连接;以及
所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,源极与所述第三电阻的连接,漏极接地。
在其中一个实施例中,所述电流调整电路包括第二开关管,栅极与所述第二电阻以及所述第三电阻连接,源极与所述第二电阻以及所述电源电压连接,漏极与所述数据驱动芯片连接。
基于同一发明构思,本申请还提供了一种供电电路,所述供电电路包括电源和保护电路;其中所述保护电路包括:
根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压;以及
电流调整电路,第一输入端与所述电源以及所述反馈电路的第一输入端连接,第二输入端与所述反馈电路的输出端连接,用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
在其中一个实施例中,第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据所述数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压减小;以及
第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的减小而增大。
在其中一个实施例中,所述第一反馈支路包括:
第一电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
热敏电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
在其中一个实施例中,所述第二反馈支路包括:
第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的漏极连接;以及
所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,漏极与所述第三电阻的连接,源极接地。
在其中一个实施例中,所述热敏电阻为负温度系数热敏电阻。
在其中一个实施例中,所述反馈电路包括:
第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压增大;以及
第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根 据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的增大而增大。
在其中一个实施例中,所述第一反馈支路包括:
热敏电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
第一电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
在其中一个实施例中,所述第二反馈支路包括:
第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的源极连接;以及
所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,源极与所述第三电阻的连接,漏极接地。
在其中一个实施例中,所述电流调整电路包括第二开关管,栅极与所述第二电阻以及所述第三电阻连接,源极与所述第二电阻以及所述电源电压连接,漏极与所述数据驱动芯片连接。
基于同一发明构思,本申请还提供了一种显示面板,包括:
显示区域,用于进行显示;以及
周边电路区域,用于为所述显示区域供电以及提供驱动信号,所述周边电路区域包括保护电路;
其中,所述供电电路包括:
反馈电路,第一输入端与电源连接,第二输入端接地,用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压;以及
电流调整电路,第一输入端与所述电源以及所述反馈电路的第一输入端连接,第二输入端与所述反馈电路的输出端连接,用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
综上,本申请提供了一种保护电路、供电电路和显示面板。所述保护电路包括反馈电路和电流调整电路。所述反馈电路的第一输入端与电源连接,所述反馈电路的第二输入端接地,用于接收电源电压,根据所述数据驱动芯 片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压。所述电流调整电路的第一输入端与所述电源以及所述反馈电路的第一输入端连接,所述电流调整电路的第二输入端与所述反馈电路的输出端连接,所述电流调整电路用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。本申请中通过所述反馈电路根据所述数据驱动芯片的温度生成反馈电压,以使得所述电流调整电路根据所述反馈电路调整输出的所述驱动电流,其中当所述数据驱动芯片的温度升高时,所述驱动电流减小,所述数据驱动芯片的热能功耗降低,从而避免了所述数据驱动芯片因其内部温度过高而被烧坏。
附图说明
图1为液晶面板的驱动架构的结构示意图;
图2为本申请实施例提供的一种保护电路的结构示意图;
图3为本申请实施例提供的另一种保护电路的结构示意图。
具体实施方式
为使本申请的上述目的、特征和优点能够更加明显易懂,下面结合附图对本申请的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本申请。但是本申请能够以很多不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本申请内涵的情况下做类似改进,因此本申请不受下面公开的具体实施的限制。
请参见图1,目前常见的超高清液晶面板的整体驱动架构中,共有双边16颗门驱动芯片和12颗数据驱动芯片,驱动板负责电源输出和信号输出,其中电源IC(Integrated circuit,集成电路)一般都会有过流保护的功能,通过侦测数据驱动芯片电源的输出电流,来判断是否关断电源的输出。但是,电源IC侦测的是全部12颗数据驱动芯片的总供电电流,若只有其中个别数据驱动芯片发生电流过大问题,可能并不会触发电源IC的过流保护,但是对于发生异常的IC来说,便有可能很快达到温度极限而烧毁。
为解决上述问题,本申请提供了一种保护电路10,所述保护电路10包括反馈电路100和电流调整电路200。
所述反馈电路100的第一输入端与电源连接,所述反馈电路100的第二 输入端接地,所述反馈电路100用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压。
所述电流调整电路200的第一输入端与所述电源以及所述反馈电路100的第一输入端连接,所述电流调整电路200的第二输入端与所述反馈电路100的输出端连接,所述电流调整电路200用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
可以理解,本申请中通过所述反馈电路100根据所述数据驱动芯片的温度生成反馈电压,以使得所述电流调整电路200根据所述反馈电路100调整输出的所述驱动电流,其中当所述数据驱动芯片的温度升高时,所述驱动电流减小,所述数据驱动芯片的热能功耗降低,从而避免了所述数据驱动芯片因其内部温度过高而被烧坏。
在其中一个实施例中,所述反馈电路100包括第一反馈支路110和第二反馈支路120。
所述第一反馈支路110的第一输入端与电源连接,所述第一反馈支路110的第二输入端接地。所述第一反馈支路110用于接收所述电源电压,根据所述数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压减小。
所述第二反馈支路120的第一输入端与所述电源以及所述第一反馈支路110的第一输入端连接,所述第二反馈支路120的第二输入端与所述第一反馈支路110的输出端连接,所述第二反馈支路120的输出端与所述电流调整电路200的第二输入端连接。所述第二反馈支路120用于接收所述电源电压以及所述第一反馈支路110输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路200,其中反馈电压随所述反馈控制电压的减小而增大。
在其中一个实施例中,所述第一反馈支路110包括第一电阻R1和热敏电阻Rtemp。
请参见图2,所述第一电阻R1的一端与所述电源连接,所述第一电阻R1的另一端与所述第二反馈支路120的第二输入端连接。
所述热敏电阻Rtemp的一端与所述第一电阻R1以及所述第二反馈支路 120的第二输入端连接,所述热敏电阻Rtemp的另一端接地。
可以理解,当所述数据驱动芯片的温度升高时,所述热敏电阻Rtemp的阻值变小,所述第一反馈支路110的第三总阻值(等于所述第一电阻R1和热敏电阻Rtemp的阻值之和)变小,通过所述第一反馈支路110的电流增大,所述第一电阻R1两端的电压增大,相应的所述热敏电阻Rtemp两端的电压减小,所述反馈控制电压等于所述热敏电阻Rtemp两端的电压,因此所述反馈控制电压变小。
当所述数据驱动芯片的温度降低时,所述热敏电阻Rtemp的阻值变大,所述第一反馈支路110的第三总阻值变大,通过所述第一反馈支路110的电流减小,所述第一电阻R1两端的电压减小,相应的所述热敏电阻Rtemp两端的电压增大,所述反馈控制电压等于所述热敏电阻Rtemp两端的电压,因此所述反馈控制电压增大。
本实施例中,所述第二反馈支路120包括第二电阻R2、第三电阻R3和第一开关管M1。
所述第二电阻R2的一端与所述电源连接,所述第二电阻R2的另一端与所述电流调整电路200的第二输入端连接。
所述第三电阻R3的一端与所述第二电阻R2以及所述电流调整电路200的第二输入端连接,所述第三电阻R3的另一端与第一开关管M1的漏极连接。
所述第一开关管M1的栅极与所述第一电阻R1以及所述热敏电阻Rtemp连接,所述第一开关管M1的漏极与所述第三电阻R3的连接,所述第一开关管M1的源极接地。
可以理解,当所述数据驱动芯片的温度升高时,所述反馈控制电压变小,所述第一开关管M1的栅极电压降低,所述第一开关管M1的导通阻抗变大,因此所述第二反馈支路120的第四总阻值(等于第二电阻R2的阻值、第三电阻R3的阻值和第一开关管M1的导通阻抗之和)增大,所述第二反馈电路100中的电流变小,所述第二电阻R2两端的电压变小。所述反馈电压等于所述第三电阻R3和所述第一开关管M1两端的电压,即等于所述电源电压与所述第二电阻R2两端的电压的差值,因此当所述第二电阻R2两端的电压变小,所述反馈电压增大。
本实施例中,所述电流调整电路200包括第二开关管M2,栅极与所述第二电阻R2以及所述第三电阻R3连接,源极与所述第二电阻R2以及所述电源电压连接,漏极与所述数据驱动芯片连接。
可以理解,当所述数据驱动芯片的温度升高时,所述反馈电压增大,所 述第二开关管M2的栅极电压升高,所述第二开关管M2的导通阻抗增大,因此,所述电流调整电路200输出的驱动电流件减小,从而降低所述数据驱动芯片中的热能功耗,以使所述数据驱动芯片可通过散热恢复至正常温度范围。
可以理解,所述热敏电阻Rtemp的阻值随温度的升高而减小,因此可以利用热敏电阻Rtemp来侦测所述数据驱动芯片的温度,作为温度的传感装置。为了更准确的侦测所述数据驱动芯片的温度,应至少将所述热敏电阻Rtemp设置在所述数据驱动芯片的内部,或者将所述热敏电阻Rtemp设置在靠近所述数据驱动芯片的位置,其他元件的位置可根据实际需要进行设置。本实施例中,将所述第一电阻R1、所述热敏电阻Rtemp和所述第一开关管M1封装在所述数据驱动芯片的内部。
本实施例中,所述第一电阻R1、所述第二电阻R2和所述第三电阻R3均为固定阻值的普通电阻,所述第一开关管M1为N型场效应管,所述第二开关管M2为P型场效应管。所述第一电阻R1和所述热敏电阻Rtemp串联形成分压电路,对输入的电源电压VAA进行分压,所述热敏电阻Rtemp两端的电压VRtemp=VAA*Rtemp/(Rtemp+R1),并将所述热敏电阻Rtemp两端的电压VRtemp作为反馈控制电压,以控制所述第一开关管M1的导通。
当所述数据驱动芯片处于常温状态时,所述Rtemp较大,所述热敏电阻Rtemp两端的电压VRtemp较高,所述第一场效应管的栅极电压较高,第一场效应管的导通阻抗较小,导通状况良好。此时电源通过第二电阻R2、第三电阻R3和第一开关管M1接地,此时所述反馈电压Vf=VAA*(R3+RN1)/(R2+R3+RN1),Vf<VAA,此时第二开关管M2导通。电源正常为所述数据驱动芯片供电。当所述数据驱动芯片的温度升高时,所述Rtemp减小,所述反馈控制电压减小,所述第一场效应管的导通阻抗增大,所述反馈电压Vf增大,所述第二开关管M2的栅极与源极之间的电压差(等于VAA-Vf)减小,所述第二开关管M2的导通阻抗RN2增大,所述电压调整电路输出的驱动电流减小,从而降低了所述数据驱动芯片的热能功耗。
当所述数据驱动芯片由于异常状况,温度接近被烧坏的边缘时,所述热敏电阻Rtemp两端的电压接近于0,所述第一开关管M1被关闭,所述反馈电压等于所述电源电压,所述第二开关管M2的栅极与源极的电压差为0,所述第二开关管M2也会截止,电源不再为所述数据驱动芯片供电,所述数据驱动芯片停止工作,避免了被烧坏的严重后果。
另外,所述热敏电阻Rtemp的具有自恢复特性,当所述数据驱动芯片的温度恢复正常时,热敏电阻Rtemp阻值也恢复正常,所述数据驱动芯片的供 电也恢复正常。因此,本申请提供的保护电路10,可以自动跟踪温度变化,适应不同的工作状态,从而为所述数据驱动芯片提供持久的保护。
本实施例中,所述热敏电阻Rtemp为负温度系数热敏电阻Rtemp。负温度吸收热敏电阻Rtemp的阻值会随温度的升高而减小,从而降低所述保护电路10的功耗。
在其中一个实施例中,请参见图3,所述反馈电路100包括第一反馈支路110和第二反馈支路120。
所述第一反馈支路110的第一输入端与电源连接,所述第一反馈支路110的第二输入端接地,所述第一反馈支路110用于接收所述电源电压,根据数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压增大。
所述第二反馈支路120的第一输入端与所述电源以及所述第一反馈支路110的第一输入端连接,所述第二反馈支路120的第二输入端与所述第一反馈支路110的输出端连接,所述第二反馈支路120的输出端与所述电流调整电路200的第二输入端连接,所述第二反馈支路120用于接收所述电源电压以及所述第一反馈支路110输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路200,其中反馈电压随所述反馈控制电压的增大而增大。
本实施例中,所述第一反馈支路110包括热敏电阻Rtemp和第一电阻R1:
所述热敏电阻Rtemp的一端与所述电源连接,所述热敏电阻Rtemp的另一端与所述第二反馈支路120的第二输入端连接。
所述第一电阻R1的一端与所述第一电阻R1以及所述第二反馈支路120的第二输入端连接,所述第一电阻R1的另一端接地。
可以理解,当所述数据驱动芯片的温度升高时,所述热敏电阻Rtemp的阻值变小,所述第一反馈支路110的第三总阻值(等于所述第一电阻R1和热敏电阻Rtemp的阻值之和)变小,通过所述第一反馈支路110的电流增大,所述第一电阻R1的两端电压增大,所述反馈控制电压等于所述第一电阻R1两端的电压,因此所述反馈控制电压增大。
所述第二反馈支路120包括第二电阻R2、第三电阻R3和第一开关管M1:
所述第二电阻R2的一端与所述电源连接,所述第二电阻R2的另一端与所述电流调整电路200的第二输入端连接。
所述第三电阻R3的一端与所述第二电阻R2以及所述电流调整电路200的第二输入端连接,所述第三电阻R3的另一端与第一开关管M1的源极连接。
所述第一开关管M1的栅极与所述第一电阻R1以及所述热敏电阻Rtemp连接,所述第一开关管M1的源极与所述第三电阻R3的连接,所述第一开关管M1的漏极接地。
可以理解,当所述数据驱动芯片的温度升高时,所述反馈控制电压增大,所述第一开关管M1的栅极电压增大,所述第一开关管M1的导通阻抗变大,因此所述第二反馈支路120的第四总阻值(等于第二电阻R2的阻值、第三电阻R3的阻值和第一开关管M1的导通阻抗之和)增大,所述第二反馈电路100中的电流变小,所述第二电阻R2两端的电压变小。所述反馈电压等于所述第三电阻R3和所述第一开关管M1两端的电压,即等于所述电源电压与所述第二电阻R2两端的电压的差值,因此当所述第二电阻R2两端的电压变小,所述反馈电压增大。
本实施例中,所述第一电阻R1、所述第二电阻R2和所述第三电阻R3均为固定阻值的普通电阻,所述第一开关管M1和所述第二开关管M2均为P型场效应管。所述第一电阻R1和所述热敏电阻Rtemp串联形成分压电路,对输入的电源电压VAA进行分压,假设所述热敏电阻Rtemp两端的电压为VRtemp,则VRtemp=VAA*Rtemp/(Rtemp+R1),并将所述热敏电阻Rtemp两端的电压VRtemp作为反馈控制电压,以控制所述第一开关管M1的导通。
当所述数据驱动芯片处于常温状态时,所述Rtemp较大,所述热敏电阻Rtemp两端的电压VRtemp较高,第一场效应管的栅极电压较小,第一场效应管的导通阻抗RN1较小,导通状况良好。此时电源通过第二电阻R2、第三电阻R3和第一开关管M1接地,此时所述反馈电压Vf=VAA*(R3+RN1)/(R2+R3+RN1),Vf<VAA,此时第二开关管M2导通,所述电源为所述数据驱动芯片正常供电。当所述数据驱动芯片的温度升高时,所述Rtemp减小,所述反馈控制电压增大,所述第一场效应管的导通阻抗增大,所述反馈电压Vf增大,所述第二开关管M2的栅极与源极之间的电压差(等于VAA-Vf)减小,所述第二开关管M2的导通阻抗RN2增大,所述电压调整电路输出的驱动电流减小,从而降低了所述数据驱动芯片的热能功耗。
当所述数据驱动芯片由于异常状况,温度接近被烧坏的边缘时,所述热敏电阻Rtemp两端的电压接近于0,所述第一开关管M1的栅极电压为VAA,所述第一开关管M1被关闭,所述反馈电压等于所述电源电压VAA,所述第二开关管M2的栅极与源极的电压差为0,所述第二开关管M2也会截止,电 源不再为所述数据驱动芯片供电,所述数据驱动芯片停止工作,避免了被烧坏的严重后果。
基于同一发明构思,本申请还提供了一种供电电路,所述供电电路包括电源和保护电路。所述供电电路可用于超高清液晶面板的整体驱动架构中,防止发生数据驱动芯片烧毁的情况。
本实施例中,所述保护电路包括:
反馈电路100和电流调整电路200。
所述反馈电路100的第一输入端与电源连接,所述反馈电路100的第二输入端接地,所述反馈电路100用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压。
所述电流调整电路200的第一输入端与所述电源以及所述反馈电路100的第一输入端连接,所述电流调整电路200的第二输入端与所述反馈电路100的输出端连接,所述电流调整电路200用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
在其中一个实施例中,所述反馈电路100包括第一反馈支路110和第二反馈支路120。
所述第一反馈支路110的第一输入端与电源连接,所述第一反馈支路110的第二输入端接地。所述第一反馈支路110用于接收所述电源电压,根据所述数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压减小。
所述第二反馈支路120的第一输入端与所述电源以及所述第一反馈支路110的第一输入端连接,所述第二反馈支路120的第二输入端与所述第一反馈支路110的输出端连接,所述第二反馈支路120的输出端与所述电流调整电路200的第二输入端连接。所述第二反馈支路120用于接收所述电源电压以及所述第一反馈支路110输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路200,其中反馈电压随所述反馈控制电压的减小而增大。
所述第一反馈支路110包括第一电阻R1和热敏电阻Rtemp。所述第一电阻R1的一端与所述电源连接,所述第一电阻R1的另一端与所述第二反馈支 路120的第二输入端连接。所述热敏电阻Rtemp的一端与所述第一电阻R1以及所述第二反馈支路120的第二输入端连接,所述热敏电阻Rtemp的另一端接地。
所述第二反馈支路120包括第二电阻R2、第三电阻R3和第一开关管M1。所述第二电阻R2的一端与所述电源连接,所述第二电阻R2的另一端与所述电流调整电路200的第二输入端连接。所述第三电阻R3的一端与所述第二电阻R2以及所述电流调整电路200的第二输入端连接,所述第三电阻R3的另一端与第一开关管M1的漏极连接。所述第一开关管M1的栅极与所述第一电阻R1以及所述热敏电阻Rtemp连接,所述第一开关管M1的漏极与所述第三电阻R3的连接,所述第一开关管M1的源极接地。
本实施例中,所述电流调整电路200包括第二开关管M2,栅极与所述第二电阻R2以及所述第三电阻R3连接,源极与所述第二电阻R2以及所述电源电压连接,漏极与所述数据驱动芯片连接。
在其中一个实施例中,所述第一反馈支路110的第一输入端与电源连接,所述第一反馈支路110的第二输入端接地,所述第一反馈支路110用于接收所述电源电压,根据数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压增大。
所述第二反馈支路120的第一输入端与所述电源以及所述第一反馈支路110的第一输入端连接,所述第二反馈支路120的第二输入端与所述第一反馈支路110的输出端连接,所述第二反馈支路120的输出端与所述电流调整电路200的第二输入端连接,所述第二反馈支路120用于接收所述电源电压以及所述第一反馈支路110输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路200,其中反馈电压随所述反馈控制电压的增大而增大。
本实施例中,所述第一反馈支路110包括热敏电阻Rtemp和第一电阻R1。所述热敏电阻Rtemp的一端与所述电源连接,所述热敏电阻Rtemp的另一端与所述第二反馈支路120的第二输入端连接。所述第一电阻R1的一端与所述第一电阻R1以及所述第二反馈支路120的第二输入端连接,所述第一电阻R1的另一端接地。
所述第二反馈支路120包括第二电阻R2、第三电阻R3和第一开关管M1。所述第二电阻R2的一端与所述电源连接,所述第二电阻R2的另一端与所述 电流调整电路200的第二输入端连接。所述第三电阻R3的一端与所述第二电阻R2以及所述电流调整电路200的第二输入端连接,所述第三电阻R3的另一端与第一开关管M1的源极连接。所述第一开关管M1的栅极与所述第一电阻R1以及所述热敏电阻Rtemp连接,所述第一开关管M1的源极与所述第三电阻R3的连接,所述第一开关管M1的漏极接地。
基于同一发明构思,本申请还提供了一种显示面板,所述显示面板包括显示区域和周边电路区域。所述显示区域用于进行显示。所述周边电路区域用于为所述显示区域供电以及提供驱动信号,所述周边电路区域包括保护电路。
其中,所述供电电路包括反馈电路100和电流调整电路200。
所述反馈电路100的第一输入端与电源连接,所述反馈电路100的第二输入端接地,所述反馈电路100用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压。
所述电流调整电路200的第一输入端与所述电源以及所述反馈电路100的第一输入端连接,所述电流调整电路200的第二输入端与所述反馈电路100的输出端连接,所述电流调整电路200用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
综上,本申请提供了一种保护电路、供电电路和显示面板。所述保护电路10包括反馈电路100和电流调整电路200。所述反馈电路100的第一输入端与电源连接,所述反馈电路100的第二输入端接地,用于接收电源电压,根据所述数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压。所述电流调整电路200的第一输入端与所述电源以及所述反馈电路100的第一输入端连接,所述电流调整电路200的第二输入端与所述反馈电路100的输出端连接,所述电流调整电路200用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。本申请中通过所述反馈电路100根据所述数据驱动芯片的温度生成反馈电压,以使得所述电流调整电路200根据所述反馈电路100调整输出的所述驱动电流,其中当所述数据驱动芯片的温度升高时,所述驱动电流减小,所述数据驱动芯片的热能功耗降低,从而避免了所述数据驱动芯片因其内部温度过高而被烧坏。
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,在不脱离本发明构思的前提下,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. 一种保护电路,包括:
    反馈电路,第一输入端与电源连接,第二输入端接地,用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压;以及
    电流调整电路,第一输入端与所述电源以及所述反馈电路的第一输入端连接,第二输入端与所述反馈电路的输出端连接,用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
  2. 如权利要求1所述的保护电路,其中所述反馈电路包括:
    第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据所述数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压减小;以及
    第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的减小而增大。
  3. 如权利要求2所述的保护电路,其中所述第一反馈支路包括:
    第一电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
    热敏电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
  4. 如权利要求3所述的保护电路,其中所述第二反馈支路包括:
    第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
    第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连 接,另一端与第一开关管的漏极连接;以及
    所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,漏极与所述第三电阻的连接,源极接地。
  5. 如权利要求4所述的保护电路,其中所述热敏电阻为负温度系数热敏电阻。
  6. 如权利要求5所述的保护电路,其中所述电流调整电路包括第二开关管,栅极与所述第二电阻以及所述第三电阻连接,源极与所述第二电阻以及所述电源电压连接,漏极与所述数据驱动芯片连接。
  7. 如权利要求1所述的保护电路,其中所述反馈电路包括:
    第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压增大;以及
    第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的增大而增大。
  8. 如权利要求7所述的保护电路,其中所述第一反馈支路包括:
    热敏电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
    第一电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
  9. 如权利要求8所述的保护电路,其中所述第二反馈支路包括:
    第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
    第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的源极连接;以及
    所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,源极与所述第三电阻的连接,漏极接地。
  10. 如权利要求9所述的保护电路,其中所述电流调整电路包括第二开关管,栅极与所述第二电阻以及所述第三电阻连接,源极与所述第二电阻以 及所述电源电压连接,漏极与所述数据驱动芯片连接。
  11. 一种供电电路,所述供电电路包括电源和保护电路;其中,所述保护电路包括:
    反馈电路,第一输入端与电源连接,第二输入端接地,用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压;以及
    电流调整电路,第一输入端与所述电源以及所述反馈电路的第一输入端连接,第二输入端与所述反馈电路的输出端连接,用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
  12. 如权利要求11所述的供电电路,其中所述反馈电路包括:
    第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据所述数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压减小;以及
    第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的减小而增大。
  13. 如权利要求12所述的供电电路,其中所述第一反馈支路包括:
    第一电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
    热敏电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
  14. 如权利要求13所述的供电电路,其中所述第二反馈支路包括:
    第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
    第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的漏极连接;以及
    所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,漏极与所述第三电阻的连接,源极接地。
  15. 如权利要求14所述的供电电路,其中所述热敏电阻为负温度系数热敏电阻。
  16. 如权利要求11所述的供电电路,其中所述反馈电路包括:
    第一反馈支路,第一输入端与电源连接,第二输入端接地,用于接收所述电源电压,根据数据驱动芯片的温度调整自身的第三总阻值,并根据所述电源电压和所述调整后的第三总阻值生成反馈控制电压,其中当所述数据驱动芯片的温度升高时,所述第三总阻值减小,所述反馈控制电压增大;以及
    第二反馈支路,第一输入端与所述电源以及所述第一反馈支路的第一输入端连接,第二输入端与所述第一反馈支路的输出端连接,输出端与所述电流调整电路的第二输入端连接,用于接收所述电源电压以及所述第一反馈支路输出的反馈控制电压,根据所述反馈控制电压调整自身的第四总阻值,根据所述电源电压以及所述调整后的第四总阻值生成所述反馈电压,并输出给所述电流调整电路,其中反馈电压随所述反馈控制电压的增大而增大。
  17. 如权利要求11所述的供电电路,其中所述第一反馈支路包括:
    热敏电阻,一端与所述电源连接,另一端与所述第二反馈支路的第二输入端连接;以及
    第一电阻,一端与所述第一电阻以及所述第二反馈支路的第二输入端连接,另一端接地。
  18. 如权利要求17所述的供电电路,其中所述第二反馈支路包括:
    第二电阻,一端与所述电源连接,另一端与所述电流调整电路的第二输入端连接;
    第三电阻,一端与所述第二电阻以及所述电流调整电路的第二输入端连接,另一端与第一开关管的源极连接;以及
    所述第一开关管,栅极与所述第一电阻以及所述热敏电阻连接,源极与所述第三电阻的连接,漏极接地。
  19. 如权利要求18所述的供电电路,其中所述电流调整电路包括第二开关管,栅极与所述第二电阻以及所述第三电阻连接,源极与所述第二电阻以及所述电源电压连接,漏极与所述数据驱动芯片连接。
  20. 一种显示面板,包括:
    显示区域,用于进行显示;以及
    周边电路区域,用于为所述显示区域供电以及提供驱动信号,所述周边 电路区域包括保护电路;
    其中,所述供电电路包括:
    反馈电路,第一输入端与电源连接,第二输入端接地,用于接收电源电压,根据数据驱动芯片的温度调整自身的第一总阻值,并根据所述电源电压和所述调整后的第一总阻值生成反馈电压;以及
    电流调整电路,第一输入端与所述电源以及所述反馈电路的第一输入端连接,第二输入端与所述反馈电路的输出端连接,用于接收所述电源电压和所述反馈电压,根据所述反馈电压和所述电源电压生成驱动电流,并提供给所述数据驱动芯片,其中所述驱动电流随所述数据驱动芯片的温度升高而减小。
PCT/CN2018/121564 2018-12-03 2018-12-17 保护电路、供电电路和显示面板 Ceased WO2020113665A1 (zh)

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