WO2020097978A1 - 显示面板的驱动电路及显示装置 - Google Patents

显示面板的驱动电路及显示装置 Download PDF

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Publication number
WO2020097978A1
WO2020097978A1 PCT/CN2018/117730 CN2018117730W WO2020097978A1 WO 2020097978 A1 WO2020097978 A1 WO 2020097978A1 CN 2018117730 W CN2018117730 W CN 2018117730W WO 2020097978 A1 WO2020097978 A1 WO 2020097978A1
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Prior art keywords
circuit
switch
electrically connected
input
switching
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Ceased
Application number
PCT/CN2018/117730
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English (en)
French (fr)
Inventor
黄笑宇
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HKC Co Ltd
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HKC Co Ltd
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Application filed by HKC Co Ltd filed Critical HKC Co Ltd
Priority to US17/043,565 priority Critical patent/US11094271B2/en
Publication of WO2020097978A1 publication Critical patent/WO2020097978A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0245—Clearing or presetting the whole screen independently of waveforms, e.g. on power-on
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/027—Arrangements or methods related to powering off a display

Definitions

  • the present application relates to the technical field of liquid crystal display, and more specifically, to a driving circuit and a display device of a display panel.
  • TFT-LCD Thin Film Transistor Liquid Crystal
  • the main driving principle of TFT-LCD is: the system board connects the R / G / B compressed signal (three primary color signals), control signal and power supply to the Connector on the PCB board (printed circuit board) through the wire; After being processed by the TCON (Timing Controller) IC on the PCB (printed circuit board), through the PCB board, through the S-COF (Source-Chip on Film) and G-COF ( Gate-Chip Film (gate film driver chip) is connected to the display area; thus enabling the LCD to obtain the required power and signals.
  • TCON Transmission Controller
  • S-COF Source-Chip on Film
  • G-COF Gate-Chip Film (gate film driver chip)
  • the G-COF has an integrated XAO (Output All On) function. That is, when shutting down, all G-COF outputs are output with a gate-on signal, all TFTs in the display panel are turned on, and the charge in the pixel electrodes is neutralized to avoid the residual image caused by the residual charge after shutdown.
  • XAO Output All On
  • the GOA technology because its gate driver chip is integrated on the array substrate, cannot solve the problem of residual image after shutdown.
  • a driving circuit for a display panel including:
  • a first circuit a first preset voltage is input through a first input terminal of the first circuit, a second preset voltage is input through a second input terminal of the first circuit, and a second input of the first circuit
  • the terminal is electrically connected to the energy storage circuit
  • First switch circuit The first input end of the first switch circuit is electrically connected to the output end of the first circuit and the output end of the current limiting circuit, respectively, and the second input end of the first switch circuit is electrically connected There is an output end of the driving chip, and the output end of the first switch circuit is electrically connected to the display panel;
  • a second switch circuit the first input terminal of the second switch circuit is electrically connected to the output terminal of the first circuit and the output terminal of the current limiting circuit, respectively, through the second input terminal of the second switch circuit Input a third preset voltage, the output end of the second switch circuit is electrically connected to the display panel;
  • the energy storage circuit includes:
  • a capacitor one end of the capacitor is electrically connected to the second preset voltage and the second input end of the first circuit, respectively, and the other end of the capacitor is grounded.
  • the first circuit includes:
  • a comparator a first preset voltage is input through the first input terminal of the comparator, a second preset voltage is input through the second input terminal of the comparator, and the second input terminal of the comparator is
  • the energy storage circuit is electrically connected, and the output end of the comparator is electrically connected to the first input end of the first switching circuit and the first input end of the second switching circuit, respectively.
  • the current limiting circuit includes:
  • a first resistor one end of the first resistor is electrically connected to the first input end of the first switching circuit and the first input end of the second switching circuit, respectively, and the other end of the first resistor is connected to the power supply
  • the output terminal is electrically connected.
  • the first switching circuit includes:
  • a first switch tube, the gate of the first switch tube is electrically connected to the output terminal of the first circuit and the output terminal of the current limiting circuit, respectively, the source electrode of the first switch tube and the driving chip
  • the output of the first switch is electrically connected, the drain of the first switch tube is electrically connected to the display panel; or,
  • the source electrode of the first switch tube is electrically connected to the display panel, and the drain electrode of the first switch tube is electrically connected to the output end of the driving chip.
  • the second switch circuit includes:
  • a second switching tube the gate of the second switching tube is electrically connected to the output terminal of the first circuit and the output terminal of the current limiting circuit, and a third pre-input is input through the source of the second switching tube Set a voltage, the drain of the second switch tube is electrically connected to the display panel; or,
  • the source of the second switch is electrically connected to the display panel, and the third preset voltage is input through the drain of the second switch.
  • the step-down circuit is electrically connected between the third preset voltage and the second input terminal of the second switching circuit.
  • the step-down circuit includes:
  • a second resistor one end of the second resistor is electrically connected to the third preset voltage, and the other end of the second resistor is electrically connected to the second input terminal of the second switching circuit.
  • a driving circuit for a display panel including:
  • a comparator a first preset voltage is input through a first input terminal of the comparator, a second preset voltage is input through a second input terminal of the comparator, and the second input terminal of the comparator is connected to the
  • the energy storage circuit is electrically connected;
  • a current limiting circuit the input end of the current limiting circuit is electrically connected to the output end of the power supply;
  • a first switch the first input of the first switch is electrically connected to the output of the comparator and the output of the current limiting circuit, and the second input of the first switch is electrically connected There is an output end of the driving chip, and the output end of the first switch tube is electrically connected to the display panel;
  • a second switching tube the first input terminal of the second switching tube is electrically connected to the output terminal of the comparator and the output terminal of the current limiting circuit, and is input through the second input terminal of the second switching tube
  • a third preset voltage the output end of the second switch tube is electrically connected to the display panel
  • the second switching tube When the first switching tube is turned on, the second switching tube is turned off, and when the second switching tube is turned on, the first switching tube is turned off.
  • the first switch circuit is controlled by the first circuit And the opening and closing of the second switch circuit, so as to realize that under the GOA architecture, the problem of afterimages of shutdown can be avoided, product quality is improved, and product competitiveness is further improved.
  • FIG. 1 is a structural block diagram of a driving circuit provided by an embodiment of this application.
  • FIG. 2 is a circuit schematic diagram of a driving circuit provided by an embodiment of the present application.
  • FIG. 3 is a structural block diagram of a driving circuit provided by another embodiment of this application.
  • FIG. 4 is a structural block diagram of a display provided by an embodiment of the present application.
  • the embodiment of the present application discloses a driving circuit and a display device of a display panel, so as to realize that the GOA (Gate On Array, gate driver chip integrated in the array substrate) architecture can avoid the problem of shutdown afterimages, improve product quality, and improve Product competitiveness.
  • GOA Gate On Array, gate driver chip integrated in the array substrate
  • an embodiment of the present application provides a driving circuit, including an energy storage circuit 100, a first circuit 200, a current limiting circuit 300, a first switching circuit 400 and a second switching circuit 500.
  • the first preset voltage 210 is input through the first input terminal of the first circuit 200.
  • a second preset voltage 220 is input through the second input terminal of the first circuit 200, and the second input terminal of the first circuit 200 is electrically connected to the energy storage circuit 100.
  • the input terminal of the current limiting circuit 300 is electrically connected to the output terminal of the power supply 310.
  • the first input terminal of the first switch circuit 400 is electrically connected to the output terminal of the first circuit 200 and the output terminal of the current limiting circuit 300, respectively.
  • the second input terminal of the first switch circuit 400 is electrically connected to the output terminal of the driving chip 410.
  • the output terminal of the first switch circuit 400 is electrically connected to the display panel 420.
  • the first input terminal of the second switch circuit 500 is electrically connected to the output terminal of the first circuit 200 and the output terminal of the current limiting circuit 300, respectively.
  • the third preset voltage 510 is input through the second input terminal of the second switch circuit 500.
  • the output terminal of the second switch circuit 500 is electrically connected to the display panel 420.
  • the first circuit 200 is used to control the first switch circuit 400 and the second switch circuit 500 to turn on.
  • the first circuit 200 is also used to control the disconnection of the first switching circuit 400 and the second switching circuit 500.
  • the first switch circuit 400 is turned on, the second switch circuit 500 is turned off.
  • the second switch circuit 500 is turned on, the first switch circuit 400 is turned off.
  • the specific structure of the energy storage circuit 100 is not specifically limited, as long as it can guarantee energy storage.
  • the energy storage circuit 100 may be composed of a first capacitor.
  • the energy storage circuit 100 may be composed of a battery.
  • the specific structure of the energy storage circuit 100 can be selected according to actual needs.
  • the first preset voltage 210 is input through the first input terminal of the first circuit 200.
  • the first preset voltage 210 refers to the input voltage of the display panel 420. It can be understood that the specific value of the first preset voltage 210 is not limited, as long as the first preset voltage 210 is kept constant. In one embodiment, the value of the first preset voltage 210 may be a DC voltage of 12V. In one embodiment, the value of the first preset voltage 210 may be a DC voltage of 14V. The specific value of the first preset voltage 210 can be selected according to actual needs.
  • the second preset voltage 220 is input through the second input terminal of the first circuit 200. The second preset voltage 220 refers to the input voltage after voltage regulation. Similarly, the specific value of the second preset voltage 220 is not specifically limited. In one embodiment, the second preset voltage 220 may be set to 12V or 14V.
  • the specific structure of the first circuit 200 may not be specifically limited, as long as the control of the first switching circuit 400 based on the first preset voltage 210 and the second preset voltage 220 and all
  • the second switching circuit 500 may be closed and opened.
  • the first circuit 200 may be composed of an operational amplifier. The operational amplifier outputs a control signal to control the closing and opening of the first switching circuit 400 and the second switching circuit 500.
  • the first circuit 200 may also be composed of a first comparator. Specifically, when the first comparator outputs a high level, the first switch circuit 400 is opened, and the second switch circuit 500 is closed. When the first comparator outputs a low level, the first switching circuit 400 is closed, and the second switching circuit 500 is open.
  • the specific structure of the current limiting circuit 300 may not be specifically limited, as long as the safety of the driving circuit 10 is ensured.
  • the current limiting circuit 300 may be composed of a resistor with a fixed resistance.
  • the current limiting circuit 300 may be composed of a sliding rheostat. The specific structure can be selected according to actual needs.
  • the first switch circuit 400 receives the control signal of the first circuit 200. When the control signal is at a low level, the first switch circuit 400 is in an on state. When the control signal is at a high level, the first switch circuit 400 is in an off state.
  • the specific structure of the first switch circuit 400 may not be specifically limited, as long as it can ensure the function of switching according to the control signal output by the first circuit 200.
  • the first switch circuit 400 is a relay control switch. In one embodiment, the first switch circuit 400 is a switch control switch.
  • the second switch circuit 500 receives the control signal of the first circuit 200. When the control signal is at a low level, the second switch circuit 500 is in an off state. When the control signal is at a high level, the second switch circuit 500 is in an on state.
  • the specific structure of the second switch circuit 500 may not be specifically limited, as long as it can ensure the function of switching according to the control signal output by the first circuit 200.
  • the second switch circuit 500 is a relay control switch. In one embodiment, the second switch circuit 500 is a switch control switch.
  • the first The circuit 200 controls the opening and closing of the first switch circuit 400 and the second switch circuit 500, so as to avoid the problem of shutdown afterimages under the GOA architecture, improve product quality, and thus improve product competitiveness.
  • the energy storage circuit 100 includes a capacitor 110.
  • One end of the capacitor 110 is electrically connected to the second preset voltage 220 and the second input end of the first circuit 200 respectively, and the other end of the capacitor 110 is grounded.
  • the second preset voltage 220 is temporarily maintained at the original voltage by the voltage stabilizing effect of the capacitor 110 (that is, the stored electrical energy is released), so that The first circuit 200 outputs a high level.
  • the first circuit 200 includes a comparator 230.
  • the first preset voltage 210 is input through the first input terminal of the comparator 230.
  • a second preset voltage 220 is input through the second input terminal of the comparator 230, and the second input terminal of the comparator 230 is electrically connected to the energy storage circuit 100.
  • the output terminal of the comparator 230 is electrically connected to the first input terminal of the first switch circuit 400 and the first input terminal of the second switch circuit 500, respectively.
  • the comparator 230 when the comparator 230 outputs a high level, the first switch circuit 400 is opened, and the second switch circuit 500 is closed. In one embodiment, when the comparator 230 outputs a low level, the first switching circuit 400 is closed, and the second switching circuit 500 is open. In one embodiment, the comparator 230 can also be replaced with an operational amplifier or the like.
  • the current limiting circuit 300 includes a first resistor 320.
  • One end of the first resistor 320 is electrically connected to the first input end of the first switch circuit 400 and the first input end of the second switch circuit 500, respectively, and the other end of the first resistor 320 is connected to the The output of the power supply 310 is electrically connected.
  • the specific structure of the first resistor 320 may not be specifically limited, as long as the current limiting function is guaranteed.
  • the first resistor 320 is a sliding rheostat with variable resistance.
  • the first resistor 320 is a resistor with a fixed resistance.
  • the first switch circuit 400 includes a first switch 430.
  • the gate of the first switch tube 430 is electrically connected to the output terminal of the first circuit 200 and the output terminal of the current limiting circuit 300, respectively.
  • the source of the first switch 430 is electrically connected to the output end of the driving chip 410; the drain of the first switch 430 is electrically connected to the display panel 420.
  • the source of the first switch 430 is electrically connected to the display panel 420; the drain of the first switch 430 is electrically connected to the output end of the driving chip 410.
  • the drain of the first switch 430 is electrically connected to the display panel 420.
  • the drain of the first switch tube 330 is electrically connected to the output end of the driving chip 410
  • the source of the first switch tube 430 is electrically connected to the display panel 420. That is, the drain and source of the first switch tube 430 can be selected according to actual requirements, and the positional relationship between the two is not specifically limited.
  • the first switching tube 430 may use a first MOS tube (field effect transistor) 431.
  • the first switching tube 430 can be an N-channel MOS tube.
  • the first switching tube 430 may also use a P-channel MOS tube. The specific structure can be selected according to actual needs.
  • the second switch circuit 500 includes a second switch 520.
  • the gate of the second switch 520 is electrically connected to the output of the first circuit 200 and the output of the current limiting circuit 300 respectively.
  • a third preset voltage 510 is input through the source of the second switch 410; the drain of the second switch 520 is electrically connected to the display panel 420.
  • the source of the second switch 520 is electrically connected to the display panel 420; the third preset voltage 510 is input through the drain of the second switch 520.
  • the drain of the second switch 520 is electrically connected to the display panel 420.
  • the source of the second switch 520 is electrically connected to the display panel 420. That is, the drain and source of the second switch 520 can be selected according to actual needs, and the positional relationship between the two is not specifically limited.
  • the second switching transistor 520 may use a second MOS transistor (field effect transistor) 521.
  • the second switching transistor 520 may be an N-channel MOS transistor.
  • the second switching tube 520 can also use a P-channel MOS tube. The specific structure can be selected according to actual needs.
  • the second switching tube 520 is a P-channel MOS tube
  • the first switching tube 430 is an N-channel MOS tube.
  • the second switch tube 520 uses an N-channel MOS tube
  • the first switch tube 430 uses a P-channel MOS tube.
  • the specific value of the third preset voltage 510 is not limited, as long as all TFTs (thin film transistors) in the display panel 420 are turned on. In one embodiment, the value of the third preset voltage 510 may be 28V. In one embodiment, the value of the third preset voltage 510 may be 33V. The specific value of the third preset voltage 510 can be selected according to actual needs.
  • the driving circuit 10 further includes a step-down circuit 530 electrically connected between the third preset voltage 510 and the second input terminal of the second switching circuit 400.
  • the specific structure of the step-down circuit 530 may not be specifically limited, as long as the safety of the driving circuit 10 is ensured.
  • the step-down circuit 530 may be composed of a resistor with a fixed resistance.
  • the step-down circuit 530 may be composed of a variable resistance sliding rheostat. The specific structure of the step-down circuit 530 can be selected according to actual needs.
  • the step-down circuit 530 includes a second resistor 531.
  • One end of the second resistor 531 is electrically connected to the third preset voltage 510.
  • the other end of the second resistor 531 is electrically connected to the second input end of the second switch circuit 400. It can be understood that the specific structure of the second resistor 531 may not be specifically limited, as long as the current limiting function is guaranteed.
  • the second resistor 531 is a sliding rheostat with variable resistance.
  • the second resistor 531 is a resistor with a fixed resistance.
  • a driving circuit of a display panel includes an energy storage circuit 100, a comparator 230, a current limiting circuit 300, a first switching tube 430, and a second switching tube 520.
  • the first preset voltage 210 is input through the first input terminal of the comparator 230.
  • a second preset voltage 220 is input through the second input terminal of the comparator 230, and the second input terminal of the comparator 230 is electrically connected to the energy storage circuit 100.
  • the input terminal of the current limiting circuit 300 is electrically connected to the output terminal of the power supply 310.
  • the first input terminal of the first switch 430 is electrically connected to the output terminal of the comparator 230 and the output terminal of the current limiting circuit 300, respectively.
  • the second input terminal of the first switch tube 430 is electrically connected to the output terminal of the driving chip 410.
  • the output end of the first switch tube 430 is electrically connected to the display panel 420.
  • the first input terminal of the second switch 520 is electrically connected to the output terminal of the comparator 230 and the output terminal of the current limiting circuit 300, respectively.
  • the third preset voltage 510 is input through the second input terminal of the second switch tube 520.
  • the output end of the second switch tube 520 is electrically connected to the display panel 420.
  • the specific structure of the energy storage circuit 100 is not specifically limited, as long as it can guarantee energy storage.
  • the energy storage circuit 100 may be composed of a first capacitor.
  • the energy storage circuit 100 may be composed of a battery.
  • the specific structure of the energy storage circuit 100 can be selected according to actual needs.
  • the first preset voltage 210 refers to the input voltage of the display panel 420. It can be understood that the specific value of the first preset voltage 210 is not limited, as long as the first preset voltage 210 is kept constant. In one embodiment, the value of the first preset voltage 210 may be a DC voltage of 12V. In one embodiment, the value of the first preset voltage 210 may be a DC voltage of 14V. The specific value of the first preset voltage 210 can be selected according to actual needs.
  • the second preset voltage 220 refers to the input voltage after voltage regulation. Similarly, the specific value of the second preset voltage 220 is not specifically limited. In one embodiment, the second preset voltage 220 may be set to 12V or 14V.
  • the comparator 230 when the comparator 230 outputs a high level, the first switch 430 is opened, and the second switch 520 is closed. In one embodiment, when the comparator 230 outputs a low level, the first switch 430 is closed, and the second switch 520 is open. In one embodiment, the comparator 230 can also be replaced with an operational amplifier or the like.
  • the specific structure of the current limiting circuit 300 may not be specifically limited, as long as the safety of the driving circuit 10 is ensured.
  • the current limiting circuit 300 may be composed of a resistor with a fixed resistance.
  • the current limiting circuit 300 may be composed of a sliding rheostat. The specific structure can be selected according to actual needs.
  • the first switch 430 receives the control signal of the comparator 230. When the control signal is at a low level, the first switch 430 is in an on state. When the control signal is at a high level, the first switch 430 is in an off state.
  • the specific structure of the first switch 430 may not be specifically limited, as long as it can ensure the function of switching according to the control signal output by the comparator 230.
  • the first switch tube 430 may be a relay control switch.
  • the first switch 430 may be a MOS switch.
  • the second switch 520 receives the control signal of the comparator 230. When the control signal is at a low level, the second switch 520 is in an off state. When the control signal is at a high level, the second switch 520 is in an on state.
  • the specific structure of the second switch tube 520 may not be specifically limited, as long as it can ensure the function of switching according to the control signal output by the comparator 230.
  • the second switch tube 520 is a relay control switch. In one embodiment, the second switch 520 is a switch control switch.
  • the comparator 230 Controlling the opening and closing of the first switch tube 430 and the second switch tube 520, so as to avoid the problem of afterimage shutdown under the GOA architecture, improve product quality, and thus improve product competitiveness.
  • the second switching circuit 500 uses N-channel MOS transistors. When the control signal received by the gate of the N-channel MOS tube is at a high level, the N-channel MOS tube is turned on. When the control signal received by the gate of the N-channel MOS tube is at a low level, the N-channel MOS tube is turned off.
  • the first switch circuit 400 uses P-channel MOS transistors. When the control signal received by the gate of the P-channel MOS tube is at a low level, the P-channel MOS tube is turned on. When the control signal received by the gate of the P-channel MOS tube is at a high level, the P-channel MOS tube is turned off.
  • the first circuit 200 may use a comparator 230.
  • the comparator 230 When the positive terminal voltage of the comparator 230 (ie, the second preset voltage 220) is less than or equal to the negative terminal voltage (ie, the first preset voltage 210), the comparator 230 outputs a low level. When the positive terminal voltage of the comparator 230 (ie, the second preset voltage 220) is greater than the negative terminal voltage (ie, the first preset voltage 210), the comparator 230 outputs a high level.
  • the energy storage circuit 100 uses the capacitor 110 as a voltage stabilizing capacitor.
  • the negative terminal voltage of the comparator 230 is a constant DC voltage (that is, the first preset voltage 210, usually 12V).
  • the positive terminal voltage of the comparator 230 (that is, the second preset voltage 220) is equal to the negative terminal voltage (that is, the first preset voltage 210), that is, the output of the comparator 230 is low at this time.
  • Level. The control signals received by the gates of the N-channel MOS tube and the P-channel MOS tube are both low level. At this time, the P-channel MOS tube is turned on, and the N-channel MOS tube is turned off. At this time, the output voltage of the driving chip 410 is equal to the input voltage of the display panel 420.
  • the externally input voltage ie, the first preset voltage 210 drops.
  • the second preset voltage 220 temporarily maintains the original voltage (ie, the positive terminal voltage of the comparator 230 is greater than the negative terminal voltage) due to the voltage stabilizing effect of the capacitor 110 (that is, the stored electrical energy is released).
  • the comparator 230 outputs a high level. That is, the control signals received by the gates of the N-channel MOS tube and the P-channel MOS tube are both high level.
  • the P-channel MOS tube is turned off, and the N-channel MOS tube is turned on.
  • the input voltage of the display panel 420 is equal to the third preset voltage 510. That is, all the TFTs (thin film transistors) in the display panel 420 are turned on, and the charges in the pixel electrodes are neutralized to avoid the shutdown image caused by the residual charges after shutdown.
  • the first circuit 200 controls the opening and closing of the first switch circuit 400 and the second switch circuit 500, so as to avoid the problem of afterimage shutdown under the GOA architecture, improve product quality, and thus improve product competitiveness.
  • an embodiment of the present application further provides a display device 20 including a display panel 420 and the driving circuit 10 described in any one of the foregoing embodiments.

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Abstract

公开了一种驱动电路，包括储能电路（100）、第一电路（200）、限流电路（300）、第一开关电路（400）以及第二开关电路（500）。通过第一电路（200）输入第一预设电压（210）和第二预设电压（220）。第一电路（200）与储能电路（100）电连接。限流电路（300）与电源（310）电连接。第一开关电路（400）分别与第一电路（200）和限流电路（300）电连接。第一开关电路（400）电连接有显示面板（420）和驱动芯片（410）的输出端。第二开关电路（500）与第一电路（200）和限流电路（300）电连接。第二开关电路（500）的输出端与显示面板（420）电连接。还提供了一种显示装置。

Description

显示面板的驱动电路及显示装置
相关申请
本申请要求2018年11月12日申请的，申请号为201811338866.8，名称为“显示面板的驱动电路及显示装置”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及液晶显示技术领域，更具体的说，涉及一种显示面板的驱动电路及显示装置。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
TFT-LCD(Thin Film Transistor Liquid Crystal Display，薄膜晶体管液晶显示器)是当前平板显示的主要品种之一，已经成为了现代IT、视讯产品中重要的显示平台。
TFT-LCD主要驱动原理为：系统主板将R/G/B压缩信号(三基色信号)、控制信号及电源通过线材与PCB板(印制电路板)上的Connector(连接器)相连接；数据经过PCB板(印制电路板)上的TCON(Timing Controller，时序控制器)IC处理后，经PCB板，通过S-COF(Source-Chip on Film，源极薄膜驱动芯片)和G-COF(Gate-Chip on Film，栅极薄膜驱动芯片)与显示区连接；从而使得LCD获得所需的电源、信号。
现近年来，为满足超窄边框及成本降低的需求，GOA(Gate On Array，栅级驱动芯片集成于阵列基板)技术得到飞速发展。
在实际运行中，为解决关机残影等问题，在传统架构中，G-COF有集成XAO (Output All On，栅极输出全部开启)功能。即在关机时将全部G-COF的output均输出栅极开启讯号，将显示面板内的TFT全部打开，将画素电极内的电荷进行中和，避免关机后残余电荷造成的关机残影。而GOA技术因为其栅级驱动芯片集成于阵列基板，所以无法解决关机残影的问题。
申请内容
有鉴于此，本申请公开一种显示面板的驱动电路及显示装置，以实现在GOA(Gate On Array，栅级驱动芯片集成于阵列基板)架构下可以避免关机残影的问题，提升产品品质，提升产品竞争力。
一种显示面板的驱动电路，包括：
储能电路；
第一电路，通过所述第一电路的第一输入端输入第一预设电压，通过所述第一电路的第二输入端输入第二预设电压，且所述第一电路的第二输入端与所述储能电路电连接；
限流电路，所述限流电路的输入端与电源的输出端电连接；
第一开关电路所述第一开关电路的第一输入端分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第一开关电路的第二输入端电连接有驱动芯片的输出端，所述第一开关电路的输出端与显示面板电连接；
第二开关电路，所述第二开关电路的第一输入端分别与所述第一电路的输出端和所述限流电路的输出端电连接，通过所述第二开关电路的第二输入端输入第三预设电压，所述第二开关电路的输出端与所述显示面板电连接；
所述第一电路用于控制所述第一开关电路与所述第二开关电路的开启，所述第一电路还用于控制所述第一开关电路与所述第二开关电路的断开，当所述第一开关电路开启时，所述第二开关电路断开，当所述第二开关电路开启时，所述第一开关电路断开。
在其中一个实施例中，所述储能电路包括：
电容，所述电容的一端分别与所述第二预设电压和所述第一电路的第二输入端电连接，所述电容的另一端接地。
在其中一个实施例中，所述第一电路包括：
比较器，通过所述比较器的第一输入端输入第一预设电压，通过所述比较器的第二输入端输入第二预设电压，且所述比较器的第二输入端与所述储能电路电连接，所述比较器的输出端分别与所述第一开关电路的第一输入端和所述第二开关电路的第一输入端电连接。
在其中一个实施例中，所述限流电路包括：
第一电阻，所述第一电阻的一端分别与所述第一开关电路的第一输入端和所述第二开关电路的第一输入端电连接，所述第一电阻另一端与所述电源的输出端电连接。
在其中一个实施例中，所述第一开关电路包括：
第一开关管，所述第一开关管的栅极分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第一开关管的源极与所述驱动芯片的输出端电连接，所述第一开关管的漏极与所述显示面板电连接；或者，
所述第一开关管的源极与所述显示面板电连接，所述第一开关管的漏极与所述驱动芯片的输出端电连接。
在其中一个实施例中，所述第二开关电路包括：
第二开关管，所述第二开关管的栅极分别与所述第一电路的输出端和所述限流电路的输出端电连接，通过所述第二开关管的源极输入第三预设电压，所述第二开关管的漏极与所述显示面板电连接；或者，
所述第二开关管的源极与所述显示面板电连接，通过所述第二开关管的漏极输入所述第三预设电压。
在其中一个实施例中，所述驱动电路还包括：
降压电路，电连接于所述第三预设电压和所述第二开关电路的第二输入端之间。
在其中一个实施例中，所述降压电路包括：
第二电阻，所述第二电阻的一端与所述第三预设电压电连接，所述第二电阻的另一端与所述第二开关电路的第二输入端电连接。
一种显示面板的驱动电路，包括：
储能电路；
比较器，通过所述比较器的第一输入端输入第一预设电压，通过所述比较器的第二输入端输入第二预设电压，且所述比较器的第二输入端与所述储能电路电连接；
限流电路，所述限流电路的输入端与电源的输出端电连接；
第一开关管，所述第一开关管的第一输入端分别与所述比较器的输出端和所述限流电路的输出端电连接，所述第一开关管的第二输入端电连接有驱动芯片的输出端，所述第一开关管的输出端与显示面板电连接；
第二开关管，所述第二开关管的第一输入端分别与所述比较器的输出端和所述限流电路的输出端电连接，通过所述第二开关管的第二输入端输入第三预设电压，所述第二开关管的输出端与所述显示面板电连接；
当所述第一开关管开启时，所述第二开关管断开，当所述第二开关管开启时，所述第一开关管断开。
本申请通过所述储能电路、所述第一电路、所述限流电路、所述第一开关电路以及所述第二开关电路的配合，通过所述第一电路控制所述第一开关电路以及所述第二开关电路的开启与闭合，从而实现在GOA架构下可以避免关机残影的问题，提升产品品质，进而提升产品竞争力。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据公开的附图获得其他的附图。
图1为本申请一实施例提供的驱动电路的结构框图；
图2为本申请一实施例提供的驱动电路的电路示意图；
图3为本申请另一实施例提供的驱动电路的结构框图；
图4为本申请一实施例提供的显示器的结构框图。
附图标记
10  驱动电路
100 储能电路
110 电容
20  显示装置
200 第一电路
210 第一预设电压
220 第二预设电压
230 比较器
300 限流电路
310 电源
320 第一电阻
400 第一开关电路
410 驱动芯片
420 显示面板
430 第一开关管
431 第一场效应晶体管
500 第二开关电路
510 第三预设电压
520 第二开关管
521 第二场效应晶体管
530 降压电路
531 第二电阻
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请实施例公开了一种显示面板的驱动电路及显示装置，以实现在GOA(Gate On Array，栅级驱动芯片集成于阵列基板)架构下可以避免关机残影的问题，提升产品品质，提升产品竞争力。
请参见图1，本申请一实施例提供一种驱动电路，包括储能电路100、第一电路200、限流电路300、第一开关电路400以及第二开关电路500。通过所述第一电路200的第一输入端输入第一预设电压210。通过所述第一电路200的第二输入端输入第二预设电压220，且所述第一电路200的第二输入端与所述储能电路100电连接。所述限流电路300的输入端与电源310的输出端电连接。
所述第一开关电路400的第一输入端分别与所述第一电路200的输出端和所述限流电路300的输出端电连接。所述第一开关电路400的第二输入端电连接有驱动芯片410的输出端。所述第一开关电路400的输出端与显示面板420 电连接。所述第二开关电路500的第一输入端分别与所述第一电路200的输出端和所述限流电路300的输出端电连接。通过所述第二开关电路500的第二输入端输入第三预设电压510。所述第二开关电路500的输出端与所述显示面板420电连接。
所述第一电路200用于控制所述第一开关电路400与所述第二开关电路500的开启。所述第一电路200还用于控制所述第一开关电路400与所述第二开关电路500的断开。当所述第一开关电路400开启时，所述第二开关电路500断开。当所述第二开关电路500开启时，所述第一开关电路400断开。
可以理解，所述储能电路100的具体结构不做具体的限定，只要保证能够储能即可。在一个实施例中，所述储能电路100可由第一电容组成。在一个实施例中，所述储能电路100可由蓄电池组成。所述储能电路100的具体结构，可根据实际需求进行选择。
通过所述第一电路200的第一输入端输入第一预设电压210。所述第一预设电压210是指所述显示面板420的输入电压。可以理解，所述第一预设电压210的具体数值不做限定，只要保证所述第一预设电压210恒定即可。在一个实施例中，所述第一预设电压210的数值可为12V的直流电压。在一个实施例中，所述第一预设电压210的数值可为14V的直流电压。所述第一预设电压210的具体数值，可根据实际需求进行选择。通过所述第一电路200的第二输入端输入第二预设电压220。所述第二预设电压220是指经过稳压后的输入电压。同样的，所述第二预设电压220的具体数值也不做具体的限定。在一个实施例中，所述第二预设电压220可设定为12V或14V。
可以理解，所述第一电路200的具体结构可以不做具体的限定，只要能够实现基于所述第一预设电压210和所述第二预设电压220控制所述第一开关电路400以及所述第二开关电路500的闭合与断开即可。在一个实施例中，所述 第一电路200可由运算放大器组成。通过所述运算放大器输出控制信号，从而控制所述第一开关电路400以及所述第二开关电路500的闭合与断开。在一个实施例中，所述第一电路200也可由第一比较器组成。具体的，当所述第一比较器输出高电平时，所述第一开关电路400断开，所述第二开关电路500闭合。当所述第一比较器输出低电平时，所述第一开关电路400闭合，所述第二开关电路500断开。
可以理解，所述限流电路300的具体结构可以不做具体的限定，只要保证所述驱动电路10的安全即可。在一个实施例中，所述限流电路300可由固定阻值的电阻组成。在一个实施例中，所述限流电路300可由滑动变阻器组成。具体的结构，可根据实际需求进行选择。
所述第一开关电路400接收所述第一电路200的控制信号。当所述控制信号为低电平时，所述第一开关电路400处于开启状态。当所述控制信号为高电平时，所述第一开关电路400处于断开状态。所述第一开关电路400的具体结构可以不做具体的限定，只要能够保证依据所述第一电路200输出的控制信号进行切换的功能即可。在一个实施例中，所述第一开关电路400为继电器控制开关。在一个实施例中，所述第一开关电路400为开关管控制开关。
所述第二开关电路500接收所述第一电路200的控制信号。当所述控制信号为低电平时，所述第二开关电路500处于断开状态。当所述控制信号为高电平时，所述第二开关电路500处于开启状态。所述第二开关电路500的具体结构可以不做具体的限定，只要能够保证依据所述第一电路200输出的控制信号进行切换的功能即可。在一个实施例中，所述第二开关电路500为继电器控制开关。在一个实施例中，所述第二开关电路500为开关管控制开关。
本实施例中，通过所述储能电路100、所述第一电路200、所述限流电路300、所述第一开关电路400以及所述第二开关电路500的配合，通过所述第一电路 200控制所述第一开关电路400以及所述第二开关电路500的开启与闭合，从而实现在GOA架构下可以避免关机残影的问题，提升产品品质，进而提升产品竞争力。
请参见图2，在一个实施例中，所述储能电路100包括电容110。所述电容110的一端分别与所述第二预设电压220和所述第一电路200的第二输入端电连接，所述电容110的另一端接地。当系统关机时(即所述驱动电路10关机)，通过所述电容110的稳压作用(即将储存的电能进行释放)，从而使所述第二预设电压220暂时维持原电压，进而使得所述第一电路200输出高电平。
在一个实施例中，所述第一电路200包括比较器230。通过所述比较器230的第一输入端输入第一预设电压210。通过所述比较器230的第二输入端输入第二预设电压220，且所述比较器230的第二输入端与所述储能电路100电连接。所述比较器230的输出端分别与所述第一开关电路400的第一输入端和所述第二开关电路500的第一输入端电连接。
在一个实施例中，当所述比较器230输出高电平时，所述第一开关电路400断开，所述第二开关电路500闭合。在一个实施例中，当所述比较器230输出低电平时，所述第一开关电路400闭合，所述第二开关电路500断开。在一个实施例中，所述比较器230也可替换为运算放大器等。
在一个实施例中，所述限流电路300包括第一电阻320。所述第一电阻320的一端分别与所述第一开关电路400的第一输入端和所述第二开关电路500的第一输入端电连接，所述第一电阻320的另一端与所述电源310的输出端电连接。可以理解，所述第一电阻320的具体结构可以不做具体的限定，只要保证能实现限流的功能即可。在一个实施例中，所述第一电阻320为阻值可变的滑动变阻器。在一个实施例中，所述第一电阻320为阻值固定的电阻。
在一个实施例中，所述第一开关电路400包括第一开关管430。所述第一开 关管430的栅极分别与所述第一电路200的输出端和所述限流电路300的输出端电连接。所述第一开关管430的源极与所述驱动芯片410的输出端电连接；所述第一开关管430的漏极与所述显示面板420电连接。或者，所述第一开关管430的源极与所述显示面板420电连接；所述第一开关管430的漏极与所述驱动芯片410的输出端电连接。
可以理解，当所述第一开关管430的源极与所述驱动芯片410的输出端电连接，则所述第一开关管430的漏极与所述显示面板420电连接。当所述第一开关管330的漏极与所述驱动芯片410的输出端电连接，则所述第一开关管430的源极与所述显示面板420电连接。即所述第一开关管430的漏极与源极是可以根据实际需求进行选择的，二者的位置关系不做具体的限定。所述第一开关管430可采用第一MOS管(场效应晶体管)431。在一个实施例中，所述第一开关管430可采用N道沟MOS管。在一个实施例中，所述第一开关管430也可采用P道沟MOS管。具体的结构，可根据实际需求进行选择。
在一个实施例中，所述第二开关电路500包括第二开关管520。所述第二开关管520的栅极分别与所述第一电路200的输出端和所述限流电路300的输出端电连接。通过所述第二开关管410的源极输入第三预设电压510；所述第二开关管520的漏极与所述显示面板420电连接。或者，所述第二开关管520的源极与所述显示面板420电连接；通过所述第二开关管520的漏极输入所述第三预设电压510。
可以理解，当所述第二开关管520的源极与所述第一电路200的第一输入端电连接，则所述第二开关管520的漏极与所述显示面板420电连接。当所述第二开关管520的漏极与所述第一电路200的第一输入端电连接，则所述第二开关管520的源极与所述显示面板420电连接。即所述第二开关管520的漏极与源极是可以根据实际需求进行选择的，二者的位置关系不做具体的限定。
在一个实施例中，所述第二开关管520可采用第二MOS管(场效应晶体管)521。在一个实施例中，所述第二开关管520可采用N道沟MOS管。在一个实施例中，所述第二开关管520也可采用P道沟MOS管。具体的结构，可根据实际需求进行选择。在一个实施例中，所述第二开关管520采用P道沟MOS管，所述第一开关管430采用N道沟MOS管。在一个实施例中，所述第二开关管520采用N道沟MOS管，所述第一开关管430采用P道沟MOS管。
可以理解，所述第三预设电压510的具体数值不做限定，只要保证将所述显示面板420内的TFT(薄膜晶体管)全部打开即可。在一个实施例中，所述第三预设电压510的数值可为28V。在一个实施例中，所述第三预设电压510的数值可为33V。所述第三预设电压510的具体数值，可根据实际需求进行选择。
在一个实施例中，所述驱动电路10还包括降压电路530，电连接于所述第三预设电压510和所述第二开关电路400的第二输入端之间。可以理解，所述降压电路530的具体结构可以不做具体的限定，只要保证所述驱动电路10的安全即可。在一个实施例中，所述降压电路530可由固定阻值的电阻组成。在一个实施例中，所述降压电路530可由阻值可变的滑动变阻器组成。所述降压电路530具体的结构，可根据实际需求进行选择。
在一个实施例中，所述降压电路530包括第二电阻531。所述第二电阻531的一端与所述第三预设电压510电连接。所述第二电阻531的另一端与所述第二开关电路400的第二输入端电连接。可以理解，所述第二电阻531的具体结构可以不做具体的限定，只要保证能实现限流的功能即可。在一个实施例中，所述第二电阻531为阻值可变的滑动变阻器。在一个实施例中，所述第二电阻531为阻值固定的电阻。
请参见图3，本申请一实施例一种显示面板的驱动电路，包括储能电路100、 比较器230、限流电路300、第一开关管430和第二开关管520。通过所述比较器230的第一输入端输入第一预设电压210。通过所述比较器230的第二输入端输入第二预设电压220，且所述比较器230的第二输入端与所述储能电路100电连接。所述限流电路300的输入端与电源310的输出端电连接。
所述第一开关管430的第一输入端分别与所述比较器230的输出端和所述限流电路300的输出端电连接。所述第一开关管430的第二输入端电连接有驱动芯片410的输出端。所述第一开关管430的输出端与显示面板420电连接。所述第二开关管520的第一输入端分别与所述比较器230的输出端和所述限流电路300的输出端电连接。通过所述第二开关管520的第二输入端输入第三预设电压510。所述第二开关管520的输出端与所述显示面板420电连接。当所述第一开关管430开启时，所述第二开关管520断开；当所述第二开关管520开启时，所述第一开关管430断开。
可以理解，所述储能电路100的具体结构不做具体的限定，只要保证能够储能即可。在一个实施例中，所述储能电路100可由第一电容组成。在一个实施例中，所述储能电路100可由蓄电池组成。所述储能电路100的具体结构，可根据实际需求进行选择。
所述第一预设电压210是指所述显示面板420的输入电压。可以理解，所述第一预设电压210的具体数值不做限定，只要保证所述第一预设电压210恒定即可。在一个实施例中，所述第一预设电压210的数值可为12V的直流电压。在一个实施例中，所述第一预设电压210的数值可为14V的直流电压。所述第一预设电压210的具体数值，可根据实际需求进行选择。所述第二预设电压220是指经过稳压后的输入电压。同样的，所述第二预设电压220的具体数值也不做具体的限定。在一个实施例中，所述第二预设电压220可设定为12V或14V。
在一个实施例中，当所述比较器230输出高电平时，所述第一开关管430 断开，所述第二开关管520闭合。在一个实施例中，当所述比较器230输出低电平时，所述第一开关管430闭合，所述第二开关管520断开。在一个实施例中，所述比较器230也可替换为运算放大器等。
可以理解，所述限流电路300的具体结构可以不做具体的限定，只要保证所述驱动电路10的安全即可。在一个实施例中，所述限流电路300可由固定阻值的电阻组成。在一个实施例中，所述限流电路300可由滑动变阻器组成。具体的结构，可根据实际需求进行选择。
所述第一开关管430接收所述比较器230的控制信号。当所述控制信号为低电平时，所述第一开关管430处于开启状态。当所述控制信号为高电平时，所述第一开关管430处于断开状态。所述第一开关管430的具体结构可以不做具体的限定，只要能够保证依据所述比较器230输出的控制信号进行切换的功能即可。在一个实施例中，所述第一开关管430可为继电器控制开关。在一个实施例中，所述第一开关管430可为MOS管开关。
所述第二开关管520接收所述比较器230的控制信号。当所述控制信号为低电平时，所述第二开关管520处于断开状态。当所述控制信号为高电平时，所述第二开关管520处于开启状态。所述第二开关管520的具体结构可以不做具体的限定，只要能够保证依据所述比较器230输出的控制信号进行切换的功能即可。在一个实施例中，所述第二开关管520为继电器控制开关。在一个实施例中，所述第二开关管520为开关管控制开关。
本实施例中，通过所述储能电路100、所述比较器230、所述限流电路300、所述第一开关管430以及所述第二开关管520的配合，通过所述比较器230控制所述第一开关管430以及所述第二开关管520的开启与闭合，从而实现在GOA架构下可以避免关机残影的问题，提升产品品质，进而提升产品竞争力。
本申请的工作过程如下：
所述第二开关电路500采用N道沟MOS管。当所述N道沟MOS管的栅极接收到的控制信号为高电平时，所述N道沟MOS管开启。当所述N道沟MOS管的栅极接收到的控制信号为低电平时，所述N道沟MOS管断开。所述第一开关电路400采用P道沟MOS管。当所述P道沟MOS管的栅极接收到的控制信号为低电平时，所述P道沟MOS管开启。当所述P道沟MOS管的栅极接收到的控制信号为高电平时，所述P道沟MOS管断开。所述第一电路200可采用比较器230。当所述比较器230的正端电压(即所述第二预设电压220)小于或等于负端电压(即所述第一预设电压210)时，所述比较器230输出低电平。当所述比较器230的正端电压(即所述第二预设电压220)大于负端电压(即所述第一预设电压210)时，所述比较器230输出高电平。所述储能电路100采用所述电容110为稳压电容。
在正常工作时，所述比较器230的负端电压为恒定的直流电压(即所述第一预设电压210，通常为12V)。此时所述比较器230的正端电压(即所述第二预设电压220)等于所述负端电压(即所述第一预设电压210)，即所述比较器230此时输出低电平。所述N道沟MOS管以及所述P道沟MOS管的栅极接收到的控制信号均为低电平。此时所述P道沟MOS管开启，所述N道沟MOS管关闭。此时所述驱动芯片410的输出电压与所述显示面板420的输入电压相等。
当系统关机时，外部输入的电压(即所述第一预设电压210)下降。此时因为所述电容110的稳压作用(即将储存的电能进行释放)，使所述第二预设电压220暂时维持原电压(即所述比较器230的正端电压大于负端电压)。此时所述比较器230输出高电平。即所述N道沟MOS管以及所述P道沟MOS管的栅极接收到的控制信号均为高电平。此时所述P道沟MOS管断开，所述N道沟MOS管开启。此时所述显示面板420的输入电压与所述第三预设电压510相等。即所述显示面板420内的TFT(薄膜晶体管)全部打开，将画素电极内的电荷进 行中和，避免关机后残余电荷造成的关机残影。
综上所述，本申请通过所述储能电路100、所述第一电路200、所述限流电路300、所述第一开关电路400以及所述第二开关电路500的配合，通过所述第一电路200控制所述第一开关电路400以及所述第二开关电路500的开启与闭合，从而实现在GOA架构下可以避免关机残影的问题，提升产品品质，进而提升产品竞争力。
请参见图4，本申请一实施例还提供一种显示装置20，包括显示面板420以及上述任一项实施例所述的驱动电路10。
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本申请。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本申请的精神或范围的情况下，在其它实施例中实现。因此，本申请将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (20)

  1. 一种显示面板的驱动电路，其特征在于，包括：
    储能电路；
    第一电路，通过所述第一电路的第一输入端输入第一预设电压，通过所述第一电路的第二输入端输入第二预设电压，且所述第一电路的第二输入端与所述储能电路电连接；
    限流电路，所述限流电路的输入端与电源的输出端电连接；
    第一开关电路，所述第一开关电路的第一输入端分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第一开关电路的第二输入端电连接有驱动芯片的输出端，所述第一开关电路的输出端与显示面板电连接；
    第二开关电路，所述第二开关电路的第一输入端分别与所述第一电路的输出端和所述限流电路的输出端电连接，通过所述第二开关电路的第二输入端输入第三预设电压，所述第二开关电路的输出端与所述显示面板电连接；
    所述第一电路用于控制所述第一开关电路与所述第二开关电路的开启，所述第一电路还用于控制所述第一开关电路与所述第二开关电路的断开，当所述第一开关电路开启时，所述第二开关电路断开，当所述第二开关电路开启时，所述第一开关电路断开。
  2. 根据权利要求1所述的驱动电路，其特征在于，所述储能电路包括：
    电容，所述电容的一端分别与所述第二预设电压和所述第一电路的第二输入端电连接，所述电容的另一端接地。
  3. 根据权利要求1所述的驱动电路，其特征在于，所述第一电路包括：
    比较器，通过所述比较器的第一输入端输入第一预设电压，通过所述比较器的第二输入端输入第二预设电压，且所述比较器的第二输入端与所述储能电路电连接，所述比较器的输出端分别与所述第一开关电路的第一输入端和所述 第二开关电路的第一输入端电连接。
  4. 根据权利要求1所述的驱动电路，其特征在于，所述限流电路包括：
    第一电阻，所述第一电阻的一端分别与所述第一开关电路的第一输入端和所述第二开关电路的第一输入端电连接，所述第一电阻的另一端与所述电源的输出端电连接。
  5. 根据权利要求1所述的驱动电路，其特征在于，所述第一开关电路包括：
    第一开关管，所述第一开关管的栅极分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第一开关管的源极与所述驱动芯片的输出端电连接，所述第一开关管的漏极与所述显示面板电连接。
  6. 根据权利要求5所述的驱动电路，其中，所述第一开关管为第一场效应晶体管。
  7. 根据权利要求1所述的驱动电路，其特征在于，所述第一开关电路包括：
    第一开关管，所述第一开关管的栅极分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第一开关管的源极与所述显示面板电连接，所述第一开关管的漏极与所述驱动芯片的输出端电连接。
  8. 根据权利要求7所述的驱动电路，其中，所述第一开关管为第一场效应晶体管。
  9. 根据权利要求1所述的驱动电路，其特征在于，所述第二开关电路包括：
    第二开关管，所述第二开关管的栅极分别与所述第一电路的输出端和所述限流电路的输出端电连接，通过所述第二开关管的源极输入第三预设电压，所述第二开关管的漏极与所述显示面板电连接。
  10. 根据权利要求8所述的驱动电路，其中，所述第二开关管为第二场效应晶体管。
  11. 根据权利要求1所述的驱动电路，其特征在于，所述第二开关电路包 括：
    第二开关管，所述第二开关管的栅极分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第二开关管的源极与所述显示面板电连接，通过所述第二开关管的漏极输入所述第三预设电压。
  12. 根据权利要求11所述的驱动电路，其中，所述第二开关管为第二场效应晶体管。
  13. 根据权利要求1所述的驱动电路，其特征在于，还包括：
    降压电路，电连接于所述第三预设电压和所述第二开关电路的第二输入端之间。
  14. 根据权利要求13所述的驱动电路，其特征在于，所述降压电路包括：
    第二电阻，所述第二电阻的一端与所述第三预设电压电连接，所述第二电阻的另一端与所述第二开关电路的第二输入端电连接。
  15. 一种显示面板的驱动电路，其特征在于，包括：
    储能电路；
    比较器，通过所述比较器的第一输入端输入第一预设电压，通过所述比较器的第二输入端输入第二预设电压，且所述比较器的第二输入端与所述储能电路电连接；
    限流电路，所述限流电路的输入端与电源的输出端电连接；
    第一开关管，所述第一开关管的第一输入端分别与所述比较器的输出端和所述限流电路的输出端电连接，所述第一开关管的第二输入端电连接有驱动芯片的输出端，所述第一开关管的输出端与显示面板电连接；
    第二开关管，所述第二开关管的第一输入端分别与所述比较器的输出端和所述限流电路的输出端电连接，通过所述第二开关管的第二输入端输入第三预设电压，所述第二开关管的输出端与所述显示面板电连接；
    当所述第一开关管开启时，所述第二开关管断开，当所述第二开关管开启时，所述第一开关管断开。
  16. 根据权利要求15所述的驱动电路，其特征在于，所述储能电路包括：
    电容，所述电容的一端分别与所述第二预设电压和所述第一电路的第二输入端电连接，所述电容的另一端接地。
  17. 根据权利要求16所述的驱动电路，其特征在于，所述限流电路包括：
    第一电阻，所述第一电阻的一端分别与所述第一开关管的第一输入端和所述第二开关管的第一输入端电连接，所述第一电阻的另一端与所述电源的输出端电连接。
  18. 根据权利要求1所述的驱动电路，其特征在于，还包括：
    降压电路，电连接于所述第三预设电压和所述第二开关管的第二输入端之间。
  19. 根据权利要求18所述的驱动电路，其特征在于，所述降压电路包括：
    第二电阻，所述第二电阻的一端与所述第三预设电压电连接，所述第二电阻的另一端与所述第二开关管的第二输入端电连接。
  20. 一种显示装置，其特征在于，包括：显示面板和驱动电路，所述驱动电路包括：
    储能电路；
    第一电路，通过所述第一电路的第一输入端输入第一预设电压，通过所述第一电路的第二输入端输入第二预设电压，且所述第一电路的第二输入端与所述储能电路电连接；
    限流电路，所述限流电路的输入端与电源的输出端电连接；
    第一开关电路，所述第一开关电路的第一输入端分别与所述第一电路的输出端和所述限流电路的输出端电连接，所述第一开关电路的第二输入端电连接 有驱动芯片的输出端，所述第一开关电路的输出端与显示面板电连接；
    第二开关电路，所述第二开关电路的第一输入端分别与所述第一电路的输出端和所述限流电路的输出端电连接，通过所述第二开关电路的第二输入端输入第三预设电压，所述第二开关电路的输出端与所述显示面板电连接；
    所述第一电路用于控制所述第一开关电路与所述第二开关电路的开启，所述第一电路还用于控制所述第一开关电路与所述第二开关电路的断开，当所述第一开关电路开启时，所述第二开关电路断开，当所述第二开关电路开启时，所述第一开关电路断开。
PCT/CN2018/117730 2018-11-12 2018-11-27 显示面板的驱动电路及显示装置 Ceased WO2020097978A1 (zh)

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