WO2020259484A1 - Circuit d'attaque et procédé pour panneau d'affichage, et dispositif d'affichage - Google Patents

Circuit d'attaque et procédé pour panneau d'affichage, et dispositif d'affichage Download PDF

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Publication number
WO2020259484A1
WO2020259484A1 PCT/CN2020/097667 CN2020097667W WO2020259484A1 WO 2020259484 A1 WO2020259484 A1 WO 2020259484A1 CN 2020097667 W CN2020097667 W CN 2020097667W WO 2020259484 A1 WO2020259484 A1 WO 2020259484A1
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WO
WIPO (PCT)
Prior art keywords
circuit
switch
display panel
control
voltage
Prior art date
Application number
PCT/CN2020/097667
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English (en)
Chinese (zh)
Inventor
黄笑宇
Original Assignee
惠科股份有限公司
重庆惠科金渝光电科技有限公司
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Publication of WO2020259484A1 publication Critical patent/WO2020259484A1/fr

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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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • 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

Definitions

  • the present application relates to the field of display technology, and in particular to a driving circuit, a driving method and a display device of a display panel.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • the system motherboard connects the R/G/B compression signal, control signal and power supply to the connector on the PCB board through wires, and the data is processed by the TCON (Timing Controller) IC on the PCB board.
  • TCON Timing Controller
  • S-COF Source-Chip on Film
  • G-COF Gate-Chip on Film
  • the purpose of this application is to provide a driving circuit, a driving method, and a display device for a display panel that can improve the afterimage of shutdown.
  • the present application discloses a driving circuit for a display panel, which includes a gate driving circuit and a charge neutralization control circuit.
  • the gate driving circuit includes a plurality of gate driving signal output terminals, and the plurality of gate driving signal output terminals Are respectively connected to the plurality of gate lines of the display panel in a one-to-one correspondence;
  • the charge neutralization control circuit is respectively connected to the plurality of gate drive signal output terminals and the plurality of gate lines of the display panel;
  • the charge neutralization control circuit includes a first power supply circuit, a switch control signal circuit, and a plurality of switch circuits.
  • the first power supply circuit provides a high-level signal; the switch control signal circuit detects the actual operating voltage of the display panel , And output a switch control signal according to the actual working voltage.
  • the control terminals of the multiple switch circuits are connected to the output terminals of the switch control signal circuit, and the input terminals are connected In the first power supply circuit, the output terminals are respectively connected to a plurality of the gate lines; wherein, when the switch control signal circuit of the charge neutralization control circuit detects that the actual operating voltage meets a preset rule, The switch control signal circuit generates a switch control signal to control turning on the plurality of switch circuits, and the high-level signal is output to the plurality of gate lines of the display panel.
  • the application also discloses a driving method of the driving circuit of the display panel, which is applied to the driving circuit of the above-mentioned display panel, and includes the steps:
  • a switch control signal controls a plurality of switch circuits to remain closed, and the gate drive circuit outputs a gate drive signal to the gate drive signal output terminal through the gate drive signal output terminal.
  • the gate line of the display panel when the actual operating voltage meets a preset rule, it is determined to be a shutdown state, and a switch control signal controls a plurality of switch circuits to conduct, so as to output a high level signal to all gates of the display panel line.
  • the application also discloses a display device, including a driving circuit and a display panel, and the driving circuit drives the display panel to display.
  • a charge neutralization control circuit provides a high level for all gate lines.
  • the charge neutralization control circuit receives the actual operating voltage of the display panel, it generates a switch control signal to control the conduction.
  • the plurality of switch circuits respectively corresponding to control each gate line of the display panel, the control terminal of each switch circuit is respectively connected to the output terminal connected to the switch control signal circuit, and the input terminal is respectively connected to a High level, when the display panel is working normally, all the switching circuits will remain closed, so that it will not affect the voltage input to the gate line when the display panel is working normally. Once it is turned off, the actual display panel will be detected.
  • the operating voltage will generate the switching control signal, and the switching circuit will be turned on one by one, providing the same voltage to all the gate lines, turning on all the thin film transistors, thereby quickly neutralizing the charges in all the pixel electrodes, improving the local Screen display problems, thereby improving the afterimage of shutdown.
  • FIG. 1 is a schematic diagram of a display device according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a gate driving circuit according to an embodiment of the present application.
  • Fig. 3 is a schematic diagram of a driving signal according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a gate driving circuit and its comparator according to another embodiment of the present application.
  • FIG. 5 is a schematic diagram of a driving signal of another embodiment of the present application.
  • FIG. 6 is a schematic diagram of a gate driving circuit, a comparator, and a flip-flop according to an embodiment of the present application
  • FIG. 7 is a schematic diagram of a driving method of an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a driving circuit of another embodiment of the present application.
  • FIG. 9 is a schematic diagram of a driving signal of another embodiment of the present application.
  • Fig. 10 is a schematic diagram of a charge neutralization control circuit and its inverter according to an embodiment of the present application.
  • FIG. 11 is a flowchart of a driving method according to an embodiment of the present application.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features; “plurality” means two or more.
  • the term “comprising” and any variations thereof means non-exclusive inclusion, the possibility of the presence or addition of one or more other features, integers, steps, operations, units, components, and/or combinations thereof.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection , It can also be electrical connection; it can be directly connected, it can also be indirectly connected through an intermediate medium, or the internal connection of two components.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection , It can also be electrical connection; it can be directly connected, it can also be indirectly connected through an intermediate medium, or the internal connection of two components.
  • an embodiment of the present application discloses a display device 100, which includes a driving circuit 300 and a display panel 200.
  • the driving circuit 300 drives the display panel 200 to display, and the driving circuit 300 includes a gate driver.
  • the gate driving circuit 320 includes a plurality of gate driving signal output terminals 321, and the plurality of gate driving signal output terminals 321 are respectively connected to the display panel 200 in a one-to-one correspondence.
  • the plurality of gate lines 340; the charge neutralization control circuit 330 is connected to the plurality of gate drive signal output terminals and the plurality of gate lines of the display panel, respectively.
  • the charge neutralization control circuit 330 includes a first power supply circuit 350, a switch control signal circuit 360, and a plurality of switch circuits 332.
  • the first power supply circuit provides a high-level signal (VGH);
  • the switch control The signal circuit 360 receives the actual operating voltage of the display panel, generates a switch control signal and outputs it; a plurality of switch circuits 332 control and output high-level signals to each different gate line 340 one by one, and the control terminal is connected to the switch
  • the output end of the control signal circuit, the input end is connected to the first power supply circuit, and the output ends are respectively connected to a plurality of the gate lines in a one-to-one correspondence; wherein, when the switch control signal circuit of the charge neutralization control circuit detects When the actual operating voltage complies with the preset rule, the switch control signal circuit generates a switch control signal to control to turn on the multiple switch circuits, and output the high voltage through multiple output terminals of the multiple switch circuits.
  • the flat signal is sent to the multiple gate lines of the display panel to turn on all the thin film transistor switches corresponding to all the gate lines 340, so that the charges in all the pixel electrodes in the display panel 200 are quickly neutralized, preventing shutdown ,
  • the voltage difference formed by the charge discharge causes display abnormalities, such as screen smear.
  • a comparator 333 is also provided in the switch control signal circuit, and the first input terminal of the comparator receives the actual display panel
  • the output terminal of the comparator is respectively connected to a plurality of control terminals of the plurality of switching circuits; the second input terminal of the comparator is connected to a preset reference voltage; wherein, the comparator receives the display For the actual operating voltage of the panel, the actual operating voltage of the display panel is compared with the preset reference voltage, and the switch control signal is generated according to the comparison result to control the switch circuit to be turned on or off.
  • the voltage of the display panel during normal operation is the rated operating voltage.
  • the circuit 332 causes other display problems. It compares the actual operating voltage of the display panel with the reference voltage, and outputs a high-level signal or a low-level signal according to the comparison result to control the switching circuit 332 to conduct, which is very convenient and quick. It should be noted that when setting the preset reference voltage, it will be set according to the specific parameters of the display panel 200. Different display panels 200 have different parameters, and the specific size of the preset reference voltage set is inconsistent.
  • the voltage is greater than 50% of the rated working voltage and less than 90% of the rated working voltage, and the preset reference voltage is equal to 90% of the actual working voltage. Within this range, shutdown can be prevented When the actual operating voltage drops too slowly, the switching comparator 333 fails to respond in time.
  • the switch circuit 332 is a switch turned on by a low-level signal, and the first input terminal The actual working voltage (VGH1) is collected, and the second input terminal is connected to a preset reference voltage (Vref). When the voltage of the actual working voltage is greater than the preset reference voltage, a high-level signal is output. At this time, the switch circuit 332 does not need to be turned on When the actual working voltage is less than the preset reference voltage, a low-level signal is output. At this time, the switch circuit 332 can select a thin film transistor that is turned on by the low-level signal, and the corresponding switch circuit is a low-level signal-turned switch.
  • a switch control signal is generated to control the turning on of the multiple switch circuits, and the high-level signal is output to the multiple gate lines to turn on All the thin film transistors in the display panel neutralize the charge in all the pixel electrodes in the display panel, thereby reducing or even eliminating the shutdown image.
  • the reference voltage can also determine that the display panel is already in shutdown mode.
  • a voltage detection circuit can also be used instead of the comparator. The voltage detection circuit determines whether the actual working voltage is equal to the preset reference voltage. When the reference voltage is set, a switch control signal is immediately generated to control to turn on the multiple switch circuits.
  • the switch control signal circuit further includes a preset logic level signal VDD and a flip-flop, the control pin of the flip-flop is connected to the output terminal of the comparator, and the flip-flop
  • the input pin is connected to the predetermined logic level signal, and the output pins of the trigger are respectively connected to the control terminals of a plurality of the switch circuits; wherein, the output terminals of the comparator are correspondingly connected through the trigger
  • a switch control signal is generated by the trigger to control the on or off of the multiple switch circuits,
  • the switch circuit 332 it can be a thin film transistor turned on by a high-level signal, or it may be a thin film transistor turned on by a low-level signal, which can be specifically set according to the actual circuit; it should be noted that,
  • the control pin of the flip-flop 334 is connected to the output terminal of the comparator 333, the input
  • the above-mentioned flip-flop 334 includes a falling edge flip-flop, the preset logic level signal is a logic high level signal, the switch circuit includes a high-level signal turn-on switch, the high-level signal turn-on switch is receiving Turn on when high-level signal, turn off when receiving low-level signal;
  • the comparator compares the actual working voltage with the preset reference voltage, and outputs a low level signal to trigger the trigger according to the comparison result, and after the trigger is triggered, outputs a high level
  • the switch control signal of the signal controls the switch circuit to conduct.
  • the switch circuit 332 does not need to perform Turn on, when the actual working voltage (VGH1) is less than the preset reference voltage (Vref), a high-level signal is output, the flip-flop 334 is selected as a rising edge trigger, and the preset logic level signal is a logic high level signal ,
  • the switch circuit includes a high-level signal turn-on switch, the high-level signal turn-on switch turns on when receiving a high-level signal, and turns off when receiving a low-level signal; the comparator turns the actual The operating voltage is compared with the preset reference voltage, and a high-level signal is output to trigger the trigger according to the comparison result. After the trigger is triggered, a switch control signal of a high-level signal is output to control the switch circuit Conduction.
  • the charge neutralization control circuit 330 further includes a flip-flop 334, and the flip-flop 334 communicates with the comparator. 333 and a plurality of the switch circuits 332, the control pin of the flip-flop 334 is connected to the output terminal of the comparator 333, and the input pin of the flip-flop 334 is connected to the output of a preset logic high level signal
  • the output pins of the flip-flop 334 are respectively connected to the multiple control terminals of the multiple switch circuits 332; the control terminal of each switch circuit 332 is respectively connected to the input of each switch circuit 332
  • the logic high level signal can be set to specific values according to the parameters of different display panels 200. The logic high level is sufficient to turn on all the thin film transistors in the display panel 200, and the charge of all the pixel electrodes in the display panel 200 In progress.
  • the display panel is divided into a display area and a non-display area
  • the non-display area includes a bonding area
  • the gate driving circuit and the charge neutralization control circuit are respectively connected through the bonding area.
  • the fixed area bonding is connected to the display panel.
  • the multiple output pins of the gate driving circuit and the gate driving circuit are arranged on the flip chip film, and the charge neutralization control circuit can also be arranged on the flip chip film , And then respectively connected to the output pins; or it can be set in the non-display area, and the fan-out wiring of the fan-out area is set on a different metal layer, and then respectively connected to multiple output pins or output pins and scan lines Fan-out routing between.
  • the charge neutralization control circuit 330 includes an inverter 335.
  • the inverter 335 connects the comparator 333 with the plurality of switch circuits 332, the input terminal of the inverter 335 is connected to the output terminal of the comparator 333, and the output terminal of the inverter 335 is respectively connected to Multiple control terminals of the switching circuit 332; wherein the inverter outputs an opposite level signal according to the received level signal, and the inverter generates the switch control signal according to the comparison of the comparator To control the conduction of a plurality of the switch circuits.
  • the inverter 335 outputs an opposite level signal according to the received level signal, a plurality of the switch circuits 332 are turned on when the low level signal is
  • the switch circuit 332 corresponds to the thin film transistor set to be turned on by the high-level signal.
  • the comparator outputs a high-level signal
  • the inverter 335 outputs a low-level signal
  • the switch circuit 332 Corresponding to the thin film transistors set to be turned on by low-level signals, as long as the switch circuit 332 can be turned on, it is feasible to output high-level signals to all the gate lines 340.
  • the driving circuit 300 of the present application further includes a grounding control circuit 370.
  • the grounding control circuit disconnects the pixel electrode 380 and the ground terminal.
  • the charge neutralization control circuit 330 sends a high level signal While outputting to all the gate lines 340, the grounding control circuit 370 is turned on to connect all the pixel electrodes 380 to the ground terminal for grounding discharge, so as to better eliminate the residual image and achieve a better effect of eliminating the residual image.
  • a method for driving a gate driving circuit of a display panel is disclosed, which is applied to the gate driving circuit in the above embodiment, and includes the steps:
  • S1 Detect the actual working voltage of the display panel, and correspondingly output different switch control signals according to whether the actual working voltage meets the preset rule to control the on or off of multiple switch circuits;
  • a switch control signal controls a plurality of switch circuits to remain closed, and the gate drive circuit outputs a gate drive through the gate drive signal output terminal Signal to the gate line of the display panel; when the actual working voltage satisfies the preset rule, it is determined to be the off state, and the switch control signal controls the multiple switch circuits to conduct, so as to output a high level signal to all the display panel Grid line.
  • whether the preset rules are met is determined by comparing the actual working voltage with the preset reference voltage.
  • the voltage when the display panel is in normal working state is the rated working voltage, and the preset reference voltage is greater than the rated working voltage. 50% of the voltage and less than 90% of the rated working voltage, when the actual working voltage is greater than the preset reference voltage, the actual working voltage does not meet the preset rule; when the actual working voltage is less than or equal to the preset reference voltage When the actual working voltage meets the preset rules.
  • the technical solution of the present application can be widely used in various display panels, such as twisted nematic (TN) display panels, in-plane switching (IPS) display panels, vertical alignment (Vertical Alignment, VA) ) Display panel, Multi-Domain Vertical Alignment (MVA) display panel, of course, it can also be other types of display panel, such as Organic Light-Emitting Diode (OLED) display panel.
  • TN twisted nematic
  • IPS in-plane switching
  • VA Vertical Alignment
  • MVA Multi-Domain Vertical Alignment
  • OLED Organic Light-Emitting Diode

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un circuit d'attaque et un procédé destinés à un panneau d'affichage, ainsi qu'un dispositif d'affichage. Le circuit d'attaque (300) comprend un circuit d'attaque de grille (320) et un circuit de commande de neutralisation de charge (330). Le circuit d'attaque de grille (320) comprend une pluralité d'extrémités de sortie de signal d'attaque de grille (321) respectivement connectées de manière correspondante à une pluralité de lignes de grille (340) d'un panneau d'affichage (200). Le circuit de commande de neutralisation de charge (330) comprend un premier circuit d'alimentation (350), une pluralité de circuits de commutation (332) et un circuit de signal de commande de commutation (360).
PCT/CN2020/097667 2019-06-27 2020-06-23 Circuit d'attaque et procédé pour panneau d'affichage, et dispositif d'affichage WO2020259484A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910564631.9 2019-06-27
CN201910564631.9A CN110459184A (zh) 2019-06-27 2019-06-27 一种显示面板的驱动电路、驱动方法和显示装置

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CN114283757A (zh) * 2021-12-29 2022-04-05 绵阳惠科光电科技有限公司 驱动电路和显示装置

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CN110459184A (zh) * 2019-06-27 2019-11-15 惠科股份有限公司 一种显示面板的驱动电路、驱动方法和显示装置
CN111161687A (zh) * 2019-12-12 2020-05-15 广州视源电子科技股份有限公司 一种电荷释放方法、装置、存储介质及电子设备
CN115472125B (zh) 2022-08-26 2024-02-27 惠科股份有限公司 显示面板的驱动电路和显示装置

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US20080042952A1 (en) * 2006-08-18 2008-02-21 Innocom Technology (Shenzhen) Co., Ltd. Power supply circuit of liquid crystal display for reducing residual image
CN106097973A (zh) * 2016-08-25 2016-11-09 深圳市华星光电技术有限公司 一种用于驱动amoled像素的电路
CN206532567U (zh) * 2017-01-04 2017-09-29 昆山龙腾光电有限公司 一种关机残影消除电路及具有其的液晶显示器
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CN110459184A (zh) * 2019-06-27 2019-11-15 惠科股份有限公司 一种显示面板的驱动电路、驱动方法和显示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114283757A (zh) * 2021-12-29 2022-04-05 绵阳惠科光电科技有限公司 驱动电路和显示装置
CN114283757B (zh) * 2021-12-29 2023-08-25 绵阳惠科光电科技有限公司 驱动电路和显示装置

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