WO2020177212A1 - Circuit et procédé de compensation d'affichage, et appareil d'affichage - Google Patents

Circuit et procédé de compensation d'affichage, et appareil d'affichage Download PDF

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Publication number
WO2020177212A1
WO2020177212A1 PCT/CN2019/085928 CN2019085928W WO2020177212A1 WO 2020177212 A1 WO2020177212 A1 WO 2020177212A1 CN 2019085928 W CN2019085928 W CN 2019085928W WO 2020177212 A1 WO2020177212 A1 WO 2020177212A1
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WO
WIPO (PCT)
Prior art keywords
display
circuit
display compensation
timing controller
pulse width
Prior art date
Application number
PCT/CN2019/085928
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English (en)
Chinese (zh)
Inventor
吴苗发
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Publication of WO2020177212A1 publication Critical patent/WO2020177212A1/fr

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Classifications

    • 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

Definitions

  • This application relates to the field of display technology, in particular to a display compensation circuit and method, and a display device.
  • the display compensation circuit When performing factory calibration and screening, as shown in Figure 1, the display compensation circuit will communicate through reading signals to read and write data in the display area. It needs to be restarted after each read and write operation. When restarting through the reset signal, the pulse width modulation circuit will output the GOA signal before the timing controller reads and writes the data, which interferes with the communication of the SPI signal, resulting in abnormal communication of the read signal, and the timing controller cannot accurately read and write data.
  • the existing display compensation circuit has a technical problem that the read signal is interfered.
  • the present application provides a display compensation circuit and method, and a display device to alleviate the technical problem that the read signal is interfered with in the existing display compensation circuit.
  • An embodiment of the application provides a display compensation circuit, including a timing controller, a pulse width modulation circuit, and an anti-interference circuit.
  • the timing controller is used to read display compensation parameters stored in a memory
  • the pulse width modulation circuit is used to
  • the display compensation parameter performs display compensation
  • the anti-interference circuit is used to trigger the pulse width modulation circuit to stop working when the timing controller reads the display compensation parameter.
  • the anti-interference circuit is also used to trigger the pulse width modulation circuit to start working after the timing controller finishes reading the display parameters.
  • the anti-interference circuit is used to receive a completion signal from the timing controller, and upon receiving the completion signal, determine that the timing controller completes the display compensation parameter Read.
  • the anti-interference circuit includes a microprocessor in the pulse width modulation chip.
  • the anti-interference circuit is used to detect the reset signal of the timing controller, and when the reset signal is detected, it is determined that the timing controller starts to read the display compensation parameters.
  • An embodiment of the present application provides a display compensation method, which includes a timing controller reading display compensation parameters stored in a memory, a pulse width modulation circuit performs display compensation according to the display compensation parameters, and an anti-interference circuit reads the display compensation parameters in the timing controller.
  • a display compensation method which includes a timing controller reading display compensation parameters stored in a memory, a pulse width modulation circuit performs display compensation according to the display compensation parameters, and an anti-interference circuit reads the display compensation parameters in the timing controller.
  • the pulse width modulation circuit is triggered to stop working.
  • the anti-interference circuit triggers the pulse width modulation circuit to start working after the timing controller finishes reading the display parameters.
  • the anti-interference circuit receives a completion signal from the timing controller, and upon receiving the completion signal, determines that the timing controller completes the display compensation parameter Read.
  • the method further includes that the anti-interference circuit triggers the pulse width modulation when the timing controller reads the display compensation parameter through the microprocessor in the pulse width modulation chip. The circuit stops working.
  • the display compensation method further includes the anti-interference circuit detecting the reset signal of the timing controller, and when the reset signal is detected, determining that the timing controller starts to read the display compensation parameters.
  • the embodiment of the application provides a display device, which includes a main control board, a printed circuit board, and a display panel.
  • the main control board and the printed circuit board are connected through a connector, and the printed circuit board and the display panel are connected through a connecting terminal;
  • the main control board is used to read the display compensation parameters stored in the printed circuit board, control the printed circuit board to perform display compensation of the display panel according to the display compensation parameters, and when the display compensation parameters are read, stop according to all
  • the display compensation parameter controls the printed circuit board to perform display compensation of the display panel
  • the printed circuit board is used to store the display compensation parameter, and perform display compensation of the display panel according to the display compensation parameter;
  • the display panel is used to work under the driving of the printed circuit board.
  • a memory and a drive circuit are provided on the printed circuit board, the memory is used to store the display compensation parameter, and the drive circuit is used to display according to the display compensation parameter Panel display compensation.
  • the driving circuit includes a gate driving integrated circuit and a source driving integrated circuit.
  • the main control board is provided with a timing controller, a pulse width modulation circuit, and an anti-interference circuit, wherein:
  • the timing controller is used to read the display compensation parameters stored in the memory
  • the pulse width modulation circuit is used to perform display compensation according to the display compensation parameter
  • the anti-interference circuit is used to trigger the pulse width modulation circuit to stop working when the timing controller reads the display compensation parameter.
  • the anti-interference circuit is a microcontroller in a pulse width modulation circuit.
  • the anti-interference circuit is further configured to trigger the pulse width modulation circuit to start working after the timing controller finishes reading the display parameters.
  • the anti-interference circuit is configured to receive a completion signal from the timing controller, and upon receiving the completion signal, determine that the timing controller completes the display compensation Reading of parameters.
  • the timing controller is used to control the work of the anti-interference circuit through a completion signal.
  • the anti-interference circuit is used to detect the reset signal of the timing controller, and when the reset signal is detected, it is determined that the timing controller starts to read the display compensation parameters .
  • the display device is a liquid crystal display device.
  • the present application provides a display compensation circuit and method, and a display device.
  • the display compensation circuit includes a timing controller, a pulse width modulation circuit, and an anti-interference circuit.
  • the timing controller is used to read display compensation parameters stored in a memory.
  • the pulse width modulation circuit is used to perform display compensation according to the display compensation parameter, and the anti-interference circuit is used to trigger the pulse width modulation circuit to stop working when the timing controller reads the display compensation parameter;
  • the display compensation circuit is controlled by sending different commands under different working conditions, and the display compensation circuit directly controls the switch of the GOA signal of the pulse width modulation circuit, which realizes the recovery when the signal is read. Interference signal, the GOA signal is turned off when the reset signal restarts, which alleviates the technical problem of interference when the existing display compensation circuit reads the signal and communicates.
  • Fig. 1 is a circuit diagram of a conventional display compensation circuit.
  • FIG. 2 is a circuit diagram of a display compensation circuit provided by an embodiment of the application.
  • FIG. 3 is a flowchart of a display compensation method provided by an embodiment of the application.
  • FIG. 4 is a circuit diagram of a display device provided by an embodiment of the application.
  • the embodiment of the present application can alleviate this problem.
  • the display compensation circuit 2 includes a timing controller 201, a pulse width modulation circuit 202, and an anti-interference circuit 203, in which:
  • the timing controller 201 is used to read the display compensation parameters stored in the memory
  • the pulse width modulation circuit 202 is configured to perform display compensation according to the display compensation parameter
  • the anti-interference circuit 203 is configured to trigger the pulse width modulation circuit 202 to stop working when the timing controller 201 reads the display compensation parameter.
  • the display compensation circuit includes a timing controller, a pulse width modulation circuit, and an anti-interference circuit.
  • the timing controller is used to read display compensation parameters stored in a memory
  • the pulse width modulation circuit is used to Display compensation parameters for display compensation
  • the anti-interference circuit is used to trigger the pulse width modulation circuit to stop working when the timing controller reads the display compensation parameters; in this way, when performing factory calibration and screening, display compensation Under different working conditions, the circuit controls the display compensation circuit by sending different commands.
  • the display compensation circuit directly controls the switch of the GOA signal of the pulse width modulation circuit, so that the interference signal is restored when the signal is read, and the GOA is closed when the reset signal is restarted. The signal solves the technical problem of interference when the existing display compensation circuit reads the signal communication.
  • the anti-interference circuit 203 is further configured to trigger the pulse width modulation circuit 202 to start working after the timing controller 201 finishes reading the display parameters.
  • the pulse width modulation circuit starts to work through the control of the anti-interference circuit, and the pulse width modulation circuit functions as a driving circuit here.
  • the pulse width modulation circuit is controlled by the anti-interference circuit and will be closed. Until the next data reading is completed, it is restored through the control of the anti-interference circuit, and the whole circuit works in this way.
  • the anti-interference circuit 203 is configured to receive a completion signal from the timing controller 201, and upon receiving the completion signal, determine that the timing controller 201 completes the display compensation parameter Read.
  • the timing controller controls the work of the anti-interference circuit by completing the signal.
  • the anti-interference circuit 203 includes a microprocessor in the pulse width modulation chip.
  • the anti-interference circuit 203 is used to detect the reset signal of the timing controller 201, and when the reset signal is detected, determine that the timing controller 201 starts to read the display compensation parameters.
  • the reset signal indicates that the entire circuit will read data the next time. After the reset signal is detected, when the anti-interference circuit detects that the timing controller starts to read the display compensation data, in order to prevent the pulse width modulation circuit The GOA signal interferes with the SPI reading signal. At this time, the anti-interference circuit needs to control the pulse width modulation circuit to stop working.
  • the display compensation method provided by the present application includes the following steps:
  • Step S301 the timing controller reads the display compensation parameters stored in the memory
  • Step S302 the pulse width modulation circuit performs display compensation according to the display compensation parameter
  • Step S303 The anti-interference circuit triggers the pulse width modulation circuit to stop working when the timing controller reads the display compensation parameter.
  • the display compensation method provided in this embodiment includes the timing controller reading the display compensation parameters stored in the memory; the pulse width modulation circuit performs display compensation according to the display compensation parameters; the anti-interference circuit reads the display in the timing controller When the parameters are compensated, the pulse width modulation circuit is triggered to stop working; in this way, when performing factory calibration and screening, the display compensation circuit is controlled by sending different commands under different working conditions, and the display compensation circuit directly controls the pulse width modulation
  • the switching of the GOA signal of the circuit realizes the restoration of the interference signal when the signal reading is completed, and the GOA signal is turned off when the reset signal is restarted, which solves the technical problem of interference when the signal communication is read by the existing display compensation circuit.
  • the method shown in FIG. 3 further includes that the anti-interference circuit triggers the pulse width modulation circuit to start working after the timing controller finishes reading the display parameters.
  • the method shown in FIG. 3 further includes the anti-interference circuit receiving a completion signal from the timing controller, and upon receiving the completion signal, determining that the timing controller completes the display Compensation parameter reading.
  • the method shown in FIG. 3 further includes that the anti-interference circuit triggers the pulse when the timing controller reads the display compensation parameter through the microprocessor in the pulse width modulation chip The wide modulation circuit stops working.
  • the method shown in FIG. 3 further includes the anti-interference circuit detecting the reset signal of the timing controller, and when the reset signal is detected, determining that the timing controller starts to read the display compensation parameter.
  • the Tcon timing controller 101
  • S-IC integrated active drive integrated circuit
  • the memory Flash on the XB performs read and write operations. Every time you do Demura, you need to restart it to read the data. The reset function is used to restart the Tcon. Tcon starts Reset when doing Demura.
  • PWM Pulse Width Modulation Circuit 102
  • SPI signal should normally be 3.3V WP, which is deformed by CK signal interference, resulting in SPI The signal is distorted, and the SPI communication is abnormal at this time, causing Tcon to fail to download the Demura data on the XB.
  • this embodiment introduces an anti-interference mechanism to ensure that after Tcon starts Reset, the three-in-one PWM immediately stops output. After Reset is completed, Tcon passes SPI communication download the Demura data on XB, and then PWM resumes work.
  • the display device provided by the present application includes a main control board CB41, a printed circuit board XB42, and a display panel 43.
  • the main control board CB41 and the printed circuit board XB42 are connected through a connector 44, and the printed circuit board
  • the circuit board XB42 and the display panel 43 are directly connected through connecting terminals; among them,
  • the main control board CB41 is used to read the display compensation parameters stored in the printed circuit board XB42, control the printed circuit board XB42 to perform display compensation on the display panel 43 according to the display compensation parameters, and when reading the display compensation parameters , Stop controlling the printed circuit board XB42 to perform display compensation on the display panel 43 according to the display compensation parameter;
  • the printed circuit board XB42 is used to store the display compensation parameters, and perform display compensation of the display panel 43 according to the display compensation parameters;
  • the display panel 43 is used to work under the driving of the printed circuit board XB42.
  • the printed circuit board XB42 is provided with a memory 421 and a drive circuit COF422, the memory 421 is used to store the display compensation parameters, and the drive circuit COF422 is used to The display compensation parameter performs display compensation on the display panel 43.
  • the drive circuit COF422 includes a gate drive integrated circuit G-IC and a source drive integrated circuit S-IC.
  • the main control board CB41 is provided with a timing controller Tcon411, a pulse width modulation circuit PWM412, and an anti-interference circuit MCU413, wherein:
  • the timing controller Tcon411 is used to read the display compensation parameters stored in the memory
  • the pulse width modulation circuit PWM412 is used to perform display compensation according to the display compensation parameter
  • the anti-interference circuit MCU413 is configured to trigger the pulse width modulation circuit 412 to stop working when the timing controller 411 reads the display compensation parameter.
  • the MCU is used to implement real-time monitoring of the Reset signal of Tcon.
  • the Reset signal will be pulled up when the system is working normally, and after Tcon starts the Reset function, it will be pulled down; this anti-interference mechanism is divided into Two states: When the MCU detects that the Reset signal is at a low level, the MCU immediately sends an OFF command to the PWM, and the PWM will stop output; then Tcon normally downloads the valid data of the Flash on the XB through the SPI communication; when the Tcon reads the valid data Send a command to the MCU, the MCU immediately sends an ON command to the PWM, and the PWM resume signal output for display compensation.
  • the existing Tcon and PWM parallel working mode is changed to the serial working mode, which can effectively prevent the SPI communication from being interfered by the PWM signal when the Tcon starts the Reset function.
  • the anti-interference circuit MCU413 is a microcontroller MCU in the pulse width modulation circuit PWM412.
  • the anti-interference circuit MCU413 is further configured to trigger the pulse width modulation circuit PWM412 to start working after the timing controller Tcon411 finishes reading the display parameters.
  • the pulse width modulation circuit starts to work through the control of the anti-interference circuit, and the pulse width modulation circuit functions as a driving circuit here.
  • the pulse width modulation circuit is controlled by the anti-interference circuit and will be closed. Until the next data reading is completed, it is restored through the control of the anti-interference circuit, and the whole circuit works in this way.
  • the anti-interference circuit MCU413 is configured to receive a completion signal from the timing controller Tcon411, and upon receiving the completion signal, determine that the timing controller Tcon411 completes the display compensation parameters Read.
  • the timing controller controls the work of the anti-interference circuit by completing the signal.
  • the anti-interference circuit MCU413 is used to detect the reset signal of the timing controller Tcon411, and when the reset signal is detected, determine that the timing controller Tcon411 starts to read the display compensation parameters.
  • the reset signal indicates that the entire circuit will read data the next time. After the reset signal is detected, when the anti-interference circuit detects that the timing controller starts to read the display compensation data, in order to prevent the pulse width modulation circuit The GOA signal interferes with the SPI reading signal. At this time, the anti-interference circuit needs to control the pulse width modulation circuit to stop working.
  • the display device provided in the embodiment of the present application is a liquid crystal display device.
  • the present application provides a display compensation circuit and method, and a display device.
  • the display compensation circuit includes a timing controller, a pulse width modulation circuit, and an anti-interference circuit.
  • the timing controller is used to read display compensation parameters stored in a memory.
  • the pulse width modulation circuit is used to perform display compensation according to the display compensation parameter, and the anti-interference circuit is used to trigger the pulse width modulation circuit to stop working when the timing controller reads the display compensation parameter;
  • the display compensation circuit is controlled by sending different commands under different working conditions, and the display compensation circuit directly controls the switch of the GOA signal of the pulse width modulation circuit, which realizes the recovery when the signal is read. Interference signal, the GOA signal is turned off when the reset signal restarts, which solves the technical problem of interference when the existing display compensation circuit reads the signal communication.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention concerne un circuit de compensation d'affichage, un procédé de compensation d'affichage et un appareil d'affichage. Lorsque le circuit de compensation d'affichage (2) est dans des états de fonctionnement différents, le circuit de compensation d'affichage (2) est commandé au moyen de l'envoi de différentes instructions de telle sorte que le circuit de compensation d'affichage (2) commande directement l'activation et la désactivation d'un signal GOA d'un circuit de modulation de largeur d'impulsions (202), ce qui permet ainsi de récupérer un signal de brouillage lorsqu'un signal est complètement lu, et d'arrêter un signal GOA lorsqu'un signal de réinitialisation est redémarré, ce qui résout dans une certaine mesure le problème technique existant selon lequel un brouillage est subi lorsqu'un circuit de compensation d'affichage lit une communication de signal.
PCT/CN2019/085928 2019-03-06 2019-05-08 Circuit et procédé de compensation d'affichage, et appareil d'affichage WO2020177212A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910166303.3A CN109903713B (zh) 2019-03-06 2019-03-06 显示补偿电路和显示补偿方法
CN201910166303.3 2019-03-06

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WO2020177212A1 true WO2020177212A1 (fr) 2020-09-10

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CN110930920B (zh) * 2019-11-21 2022-07-12 Tcl华星光电技术有限公司 一种显示装置及其驱动方法
CN110910848A (zh) 2019-11-28 2020-03-24 Tcl华星光电技术有限公司 液晶显示器的驱动电路及驱动方法
CN110969979B (zh) * 2019-12-25 2021-09-03 Tcl华星光电技术有限公司 一种显示面板的驱动电路及其驱动方法
US11120731B2 (en) 2019-12-25 2021-09-14 Tcl China Star Optoelectronics Technology Co., Ltd. Driving circuit for display panel and method of driving same
CN111681585B (zh) * 2020-06-05 2023-10-13 Tcl华星光电技术有限公司 一种显示面板的驱动电路及显示装置

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