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 PDFInfo
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- 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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- power supply
- feedback
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency 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
- H02H5/042—Emergency 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
-
- 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
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
Description
Claims (20)
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
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| Application Number | Priority Date | Filing Date | Title |
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| US15/734,874 US11222610B2 (en) | 2018-12-03 | 2018-12-17 | Protection circuit, power supply circuit, and display panel |
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| CN201811465795.8A CN109377956B (zh) | 2018-12-03 | 2018-12-03 | 保护电路和供电电路 |
| CN201811465795.8 | 2018-12-03 |
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| CN111313662B (zh) * | 2020-05-09 | 2020-12-25 | 上海思路迪医学检验所有限公司 | 可实现过温度保护的h桥驱动电路以及电气系统 |
| CN113077736A (zh) * | 2021-03-19 | 2021-07-06 | Tcl华星光电技术有限公司 | 控制电路、显示装置以及电子设备 |
| CN114299872B (zh) * | 2022-01-04 | 2023-07-18 | 京东方科技集团股份有限公司 | 一种驱动电路及其驱动方法、显示装置 |
| CN115134971A (zh) * | 2022-07-04 | 2022-09-30 | 矽力杰半导体技术(杭州)有限公司 | 线性led驱动电路 |
| CN115294888B (zh) * | 2022-08-29 | 2024-07-26 | 京东方科技集团股份有限公司 | 显示模组及显示装置 |
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- 2018-12-03 CN CN201811465795.8A patent/CN109377956B/zh active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| US11222610B2 (en) | 2022-01-11 |
| CN109377956A (zh) | 2019-02-22 |
| US20210134238A1 (en) | 2021-05-06 |
| CN109377956B (zh) | 2020-05-12 |
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