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WO2020135021A1 - Procédé de protection contre les surintensités, panneau d'affichage et appareil de protection contre les surintensités - Google Patents

Procédé de protection contre les surintensités, panneau d'affichage et appareil de protection contre les surintensités Download PDF

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Publication number
WO2020135021A1
WO2020135021A1 PCT/CN2019/124260 CN2019124260W WO2020135021A1 WO 2020135021 A1 WO2020135021 A1 WO 2020135021A1 CN 2019124260 W CN2019124260 W CN 2019124260W WO 2020135021 A1 WO2020135021 A1 WO 2020135021A1
Authority
WO
WIPO (PCT)
Prior art keywords
clock control
control signal
preset threshold
difference
maximum current
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2019/124260
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English (en)
Chinese (zh)
Inventor
郭东胜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HKC Co Ltd
Original Assignee
HKC Co Ltd
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 HKC Co Ltd filed Critical HKC Co Ltd
Publication of WO2020135021A1 publication Critical patent/WO2020135021A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • G09G3/3674—Details of drivers for scan electrodes

Definitions

  • the present application relates to the technical field of display panels, in particular to an overcurrent protection method, a display panel and an overcurrent protection device.
  • Array substrate row drive (Gate Driver On Array, GOA) technology is a kind of thin film transistor (Thin Film Transistor, TFT) gate scanning drive circuit is made on the array substrate to replace the drive chip made by external silicon chip. Since the GOA circuit can be made directly around the panel, the LCD can be lowered (Liquid Crystal The thickness of the panel of Display, LCD) simplifies the manufacturing process, and can reduce product cost and improve the integration of the LCD panel. In the exemplary technology, the application of GOA technology will cause a short circuit in the display panel, causing a problem of screen burning.
  • TFT Thi Film Transistor
  • the main purpose of the present application is to provide an over-current protection method, a display panel and an over-current protection device to avoid short circuit in the display panel and cause screen burn.
  • an overcurrent protection method proposed in this application includes the following steps:
  • the level shifter set to generate each clock control signal is turned off
  • the clock control signal is controlled to turn on the switching device line by line.
  • the method further includes:
  • the level shifter set to generate each channel of the clock control signal is turned off, wherein the second preset threshold is greater than the first preset Threshold;
  • the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signal of the different channels is performed.
  • the step of acquiring the target maximum current value of each clock control signal within a preset duration includes:
  • the target maximum current value is the maximum current value within one cycle of the clock control signal.
  • the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:
  • the difference between the target maximum current value of the remaining clock control signals of each channel and the reference value is obtained, and the absolute value is obtained for the difference value.
  • the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:
  • the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:
  • the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:
  • the step of turning off the level shifter set to generate each clock control signal includes:
  • the level shifter set to generate each clock control signal is turned off.
  • the step of turning off the level shifter set to generate each clock control signal includes:
  • the level shifter set to generate each clock control signal is turned off; wherein, the third preset threshold is less than the first preset threshold.
  • the method before the step of controlling the clock control signal to turn on the switching device line by line, the method further includes:
  • the first preset threshold is a preset voltage threshold, and when any absolute value of the difference is greater than the first preset threshold, the level shifter configured to generate each clock control signal is turned off.
  • the steps include:
  • the level shifter that generates each clock control signal is turned off.
  • the switching device is a thin film transistor.
  • the present application also provides an overcurrent protection method, which includes the following steps:
  • the level shifter set to generate each clock control signal is turned off
  • the clock control signal is controlled to turn on the switching device line by line.
  • the step of acquiring the average current value of the plurality of maximum current values in multiple clock cycles of each clock control signal, and using the average current value as the target maximum current value includes:
  • the level shifter set to generate each channel of the clock control signal is turned off, wherein the second preset threshold is greater than the first preset Threshold;
  • the target maximum current value of each channel of the clock control signal is less than the second preset threshold, the target maximum current value of any channel of the clock control signal is used as a reference value to obtain the target of the remaining clock control signals. The step of determining the absolute value of the difference between the maximum current value and the reference value.
  • the present application also provides a display panel including a timing controller, a level shifter, a current sensor, and a comparator that are electrically connected in sequence.
  • a display panel including a timing controller, a level shifter, a current sensor, and a comparator that are electrically connected in sequence.
  • the timing controller turns off the level shifter set to generate each clock control signal
  • the timing controller controls the clock control signal to turn on the switching device line by line.
  • the display panel further includes an output buffer connected between the level shifter and the switching device, and the buffer is used to amplify the current of the clock control signal to drive The switching device is turned on.
  • the present application also provides an overcurrent protection device.
  • the overcurrent protection device includes: a memory, a processor, and an overcurrent protection program stored on the memory and executable on the processor, When the overcurrent protection program is executed by the processor, the following steps are implemented:
  • the level shifter set to generate each clock control signal is turned off
  • the clock control signal is controlled to turn on the switching device line by line.
  • a level shifter that generates each clock control signal, interrupts the transmission process of the clock control signal, to prevent the display panel from being burned, and controls the display panel when the absolute value of all differences is less than the first preset threshold normal work.
  • the comparison between the absolute value of the difference between the target maximum current of the different clock control signals and the preset first threshold is used to control whether to turn off the level shifter.
  • the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small.
  • the level shifter will also be turned off in time to prevent the clock control signal from fluctuating without being detected. Heat is accumulated in the display panel to prevent excessive heat accumulated in the display panel from burning out the display device.
  • FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of an embodiment of an overcurrent protection method of the present invention
  • FIG. 3 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention.
  • FIG. 5 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention.
  • FIG. 6 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention.
  • FIG. 8 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention.
  • FIG. 9 is a schematic diagram of the circuit frame of the display panel of the present application.
  • the level shifter set to generate each clock control signal is turned off
  • the clock control signal is controlled to turn on the switching device line by line.
  • the application of GOA technology will cause a short circuit in the display panel, causing a problem of screen burning.
  • This application obtains the target maximum current value of each clock control signal and obtains the absolute value of the difference between the target maximum currents of different clock control signals.
  • the A level shifter of a clock control signal interrupting the transmission process of the clock control signal to prevent the display panel from being burnt out, and controlling the display panel to work normally when the absolute value of all differences is less than the first preset threshold .
  • the comparison between the absolute value of the difference between the target maximum current of the different clock control signals and the preset first threshold is used to control whether to turn off the level shifter.
  • the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small.
  • the level shifter will also be turned off in time to prevent the clock control signal from having a small fluctuation and not being detected. The heat accumulated in the display panel prevents excessive heat accumulated in the display panel from burning out the display device.
  • FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment involved in a solution of an embodiment of the present application.
  • the terminal may be a PC, or may be a mobile terminal device with a display function, such as a smart phone, a tablet computer, or a portable computer.
  • the terminal may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002.
  • the communication bus 1002 is configured to implement connection communication between these components.
  • the user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface and a wireless interface.
  • the network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).
  • the memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as disk storage.
  • the memory 1005 may optionally be a storage device independent of the foregoing processor 1001.
  • FIG. 1 does not constitute a limitation on the terminal, and may include more or less components than those illustrated, or combine certain components, or have different component arrangements.
  • the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an overcurrent protection program.
  • the network interface 1004 is mainly configured to connect to a background server and perform data communication with the background server;
  • the user interface 1003 is mainly configured to connect to a client (user side) and perform data communication with the client;
  • the processor 1001 can be set to call the overcurrent protection program stored in the memory 1005 and perform the following operations:
  • the level shifter set to generate each clock control signal is turned off
  • the clock control signal is controlled to turn on the switching device line by line.
  • processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:
  • the level shifter set to generate each clock control signal is turned off
  • the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signal of the different channels is performed.
  • processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:
  • processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:
  • the level shifter configured to generate each clock control signal is turned off.
  • processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:
  • the third preset threshold is less than the first preset threshold.
  • processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:
  • processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:
  • the level shifter that generates each clock control signal is turned off.
  • the overcurrent protection method includes the following steps:
  • the clock control signal is Shifter
  • each of the level shifters generates one channel of the clock control signal
  • one channel of the clock control signal corresponds to controlling a row of switching devices on or off, for example, when the clock control signal is directed to the corresponding row of switching devices
  • the switching device of the corresponding row is turned on, and when the clock control signal outputs a low level to the switching device of the corresponding row, the switching device of the corresponding row is turned off.
  • the current value of the clock control signal is sensed by the current sensor at any time or at a preset sampling point, And obtain the target maximum current value from the current value.
  • the target maximum current value may be a maximum current value within one cycle of the clock control signal, or may be an average value of multiple maximum current values corresponding to multiple cycles of one clock control signal.
  • the switching device is a thin film transistor.
  • the target maximum current value of any clock control signal of any channel may be used as a reference value to obtain the difference between the target maximum current value of the remaining clock control signals of each channel and the reference value, such as 4 clocks Control signal CLK-1 in, CLK-2 in, CLK-3 in, CLK-4 in as an example, assuming CLK-1 in, CLK-2 in, CLK-3 in, CLK-4
  • the target maximum current values of in are CLK-1-Imax, CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax, with CLK-1
  • the target maximum current value corresponding to in is the reference value, and the difference between the target maximum current values CLK-2-Imax, CLK-3-Imax and CLK-4-Imax of the remaining clock control signals and the reference value is obtained, then Have:
  • any one of CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax may be used as a reference value, and then the reference value and the target maximum current value of the remaining clock control signals may be obtained.
  • the difference may also be obtained by comparing the target maximum current values of two adjacent clock control signals, such as:
  • the target maximum current value of the clock control signal whose difference has been calculated is not repeatedly calculated, such as:
  • the calculation result of the above difference may be a positive value or a negative value, so all the above differences are taken as absolute values.
  • the first preset threshold may be a preset current value or a preset voltage value.
  • the first preset threshold can be designed to be relatively small, such as can be set It is 0.1V, 0.2V, 0.5V, etc.
  • the absolute value of the difference when the absolute value of the difference is greater than the first preset threshold, such as the difference A, B, C, D, E, F, G, H, I, J, K, L, M
  • the first preset threshold such as the difference A, B, C, D, E, F, G, H, I, J, K, L, M
  • the absolute value of any difference of N is greater than the first preset threshold, it is proved that one of the two clock control signals corresponding to the absolute value of the difference has a larger target maximum current value, and the larger The target maximum current value may be caused by a short circuit in the display panel. Even if it is not caused by a short circuit in the display panel, the larger target maximum current value may cause heat accumulation in the display panel.
  • Short circuit or heat accumulation in the display panel may cause the display panel Burnout, therefore, when any of the absolute values of the difference is greater than the first preset threshold, the level shifter set to generate each clock control signal is promptly closed, and the clock signal is interrupted to continue the transmission process to the display panel To effectively prevent the display panel from being burned.
  • the clock control signal is controlled to turn on the switching device line by line to realize the normal display function of the display panel.
  • the absolute value of any difference is greater than the first preset threshold ,
  • the level shifter that generates each clock control signal is turned off, the transmission process of the clock control signal is interrupted, and the display panel is prevented from being burned.
  • the control The display panel described above works normally.
  • the comparison between the absolute value of the difference between the target maximum current of the different clock control signals and the preset first threshold is used to control whether to turn off the level shifter.
  • the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small.
  • the level shifter will also be turned off in time to prevent the clock control signal from having a small fluctuation and not being detected. The heat accumulated in the display panel prevents excessive heat accumulated in the display panel from burning out the display device.
  • the method further includes:
  • step S20 is continued.
  • the second preset threshold may be a preset current value or a preset voltage value.
  • the level shifter set to generate each clock control signal is directly turned off without acquiring the target maximum current of the clock control signal of a different path
  • the absolute value of the difference between the values is then compared with the first preset threshold, thereby simplifying the processing process and increasing the processing speed.
  • the step S10 includes:
  • the target maximum current value is the maximum current value within one cycle of the clock signal
  • a misjudgment will occur and turning off the level shifter will cause the display panel to not work normally
  • the average current value of multiple maximum current values in multiple clock cycles of each clock control signal is obtained, and the average current value is used as the target maximum current value. If the absolute value of the difference between the average current value of the maximum current value and the first preset threshold is still greater than the first preset threshold, it may be determined that a short circuit or heat accumulation has occurred in the display panel, thereby avoiding the occurrence of a misjudgment.
  • the step S40 includes:
  • the absolute value of the difference when only one of the absolute values of the difference is greater than the first preset threshold, the absolute value of the difference may be caused by load fluctuations in the display panel and may cause a misjudgment and close the level shifter. As a result, the display panel cannot work normally, so in this embodiment, the average value of the plurality of absolute values of the differences is obtained, and the average value and the third preset threshold are used to judge the size. When there is only one larger difference When the absolute value of the value is greater than the other absolute values of the differences due to load fluctuations, the average value of all the absolute values of the differences must be less than the first preset threshold. The panel works normally to avoid misjudgment.
  • the step S40 includes:
  • the third preset threshold may be a preset current value or a preset voltage value.
  • the third preset threshold is less than the first preset threshold, the third preset threshold can be The smaller fluctuations in the display panel can be used to turn off the level shifter to more sensitively avoid the screen burning problem caused by heat accumulation.
  • the method further includes:
  • S80 Amplify the current value of the clock control signal and keep the voltage value of the clock control signal unchanged.
  • Out Buffer to amplify the current value of the clock control signal signal to enhance the driving capability of the clock signal to drive the switching device to turn on line by line, while keeping the voltage value of the clock control signal unchanged, that is, to maintain the The voltage value of the clock control signal is the turn-on voltage of the switching device.
  • the first preset threshold is a preset voltage threshold
  • the step S40 includes:
  • the first preset threshold is generally set to a voltage value
  • the difference is the difference between the target maximum current
  • the difference is also the current value, so it is necessary to The difference value is converted into a current value for comparison with the preset voltage threshold.
  • each difference value is mirrored by a mirror current source to obtain a mirror current, and the difference value is obtained according to the mirror current Corresponding voltage value, and compare the voltage value with the preset voltage threshold to determine whether to turn off the level shifter that generates each clock control signal.
  • the present application also provides a display panel, the display panel includes a timing controller 10, a level shifter 20, a current sensor 30 and a comparator 40 electrically connected in sequence, the display panel During operation, perform the following steps of the overcurrent protection method:
  • the timing controller 10 turns off the level shifter 20 configured to generate each clock control signal;
  • the timing controller controls the clock control signal to turn on the switching device line by line.
  • the current value of the clock control signal signal is amplified by the output buffer 50 to enhance the driving capability of the clock signal to drive the switching device to turn on line by line, while keeping the voltage value of the clock control signal unchanged, That is, the voltage value of the clock control signal is maintained at the turn-on voltage of the switching device.
  • the present application also provides an overcurrent protection device.
  • the overcurrent protection device includes: a memory, a processor, and an overcurrent protection program stored on the memory and executable on the processor. When the stream protection program is executed by the processor, the following steps are implemented:
  • the level shifter set to generate each clock control signal is turned off
  • the clock control signal is controlled to turn on the switching device line by line.

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

Abstract

L'invention concerne un procédé de protection contre les surintensités, un appareil de protection contre les surintensités et un panneau d'affichage. Le procédé de protection contre les surintensités comprend les étapes consistant : à acquérir des valeurs de différence absolue entre des valeurs de courant maximum cible de chaque signal de commande d'horloge pendant une durée prédéfinie ; lorsque toute valeur de différence absolue est supérieure à un premier seuil prédéfini, à désactiver un convertisseur de niveau configuré pour générer chaque signal de commande d'horloge ; et lorsque chaque valeur de différence absolue est inférieure au premier seuil prédéfini, à amener les signaux de commande d'horloge à activer les dispositifs de commutation rangée par rangée.
PCT/CN2019/124260 2018-12-25 2019-12-10 Procédé de protection contre les surintensités, panneau d'affichage et appareil de protection contre les surintensités Ceased WO2020135021A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811595967.3A CN109584829B (zh) 2018-12-25 2018-12-25 过流保护方法、显示面板及过流保护装置
CN201811595967.3 2018-12-25

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WO2020135021A1 true WO2020135021A1 (fr) 2020-07-02

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CN110060644B (zh) * 2019-04-10 2021-01-01 深圳市华星光电技术有限公司 液晶显示装置及其过流保护方法
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