WO2020056872A1 - Système de commande de gradation et procédé de commande de gradation pour source de rétroéclairage, et dispositif d'affichage - Google Patents

Système de commande de gradation et procédé de commande de gradation pour source de rétroéclairage, et dispositif d'affichage Download PDF

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Publication number
WO2020056872A1
WO2020056872A1 PCT/CN2018/113594 CN2018113594W WO2020056872A1 WO 2020056872 A1 WO2020056872 A1 WO 2020056872A1 CN 2018113594 W CN2018113594 W CN 2018113594W WO 2020056872 A1 WO2020056872 A1 WO 2020056872A1
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Prior art keywords
backlight
dimming
constant current
data processing
control chip
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PCT/CN2018/113594
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English (en)
Chinese (zh)
Inventor
巢铁牛
沈思宽
戴奇峰
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深圳创维－Rgb电子有限公司
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Publication of WO2020056872A1 publication Critical patent/WO2020056872A1/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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. 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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Definitions

  • the present disclosure relates to the field of display technology, for example, a dimming control system, a dimming control method, and a display device of a backlight source.
  • MiniLED With the development of technology, a small batch of MiniLED with ultra-small process structure has achieved mass production. Because of its small structure, MiniLED can achieve more partitions. Compared to traditional LCD display technology, MiniLED has more backlight partitions. The TV picture quality is higher, the energy consumption is lower, the picture is more detailed, and the contrast is more obvious.
  • the conventional partitioned localdimming backlight TV uses a single light zone control, that is, one partition requires one control source.
  • the number of backlight partitions is increasing, and the control system will be more and more complicated.
  • the control system is prone to errors and affects the reliability and stability of the product.
  • an object of the present disclosure is to provide a dimming control system, a dimming control method, and a display device for a backlight, which can use a small number of constant current control modules to perform multi-zone control, thereby Double the number of constant current control modules.
  • a backlight dimming control system includes:
  • a main control chip for sending a dimming control signal to the data processing control chip
  • the data processing control chip is used for receiving the dimming control signal of the main control chip and processing it, and then sends it to the constant current control module, and sends the line switching signal of the specific timing to the line scanning unit circuit;
  • Power supply module for powering the main control chip, data processing control chip and backlight LED
  • At least one line scanning unit circuit configured to control the positive electrodes of the backlight LEDs in a plurality of areas to be turned on in a time-sharing manner according to the line switching signals of a specific timing sent by the data processing control chip;
  • At least one constant current control module is configured to divide the backlight LED into a plurality of regions, and control the time-divisional amount of backlight LEDs in multiple regions to be turned off according to the dimming control signal processed by the data processing control chip.
  • the data processing control chip is set with a communication protocol, and the communication protocol is one of an SPI communication protocol, an I2C protocol, a two-wire protocol, or a multi-wire protocol.
  • the line scanning unit circuit includes a plurality of line scan switches, one end of each line scan switch is connected to a power supply module, and the other end of each line scan switch is connected to a backlight LED area. , The control end of each line scan switch is connected to a data processing control chip.
  • the data processing control chip is specifically configured to receive and process the dimming control signals of the main control chip, and generate N line switching signals according to the number of line scanning switches in the line scanning unit circuit. It then sends it to the corresponding line scan switch in the line scan unit circuit, where the timings of any two line switch signals being high-level signals are different, and N represents the number of line scan switches.
  • the sum of the durations of the N high-level signals of the row switch signals is the period of the field synchronization signal of the dimming control signal.
  • the constant current control module includes a constant current control unit and a high-voltage isolating switch control unit, and the high-voltage isolating switch control unit is connected to the negative electrode of the backlight LED in multiple regions and the constant current control.
  • the constant current control unit is also connected to a data processing control chip.
  • the constant current control unit is a constant current control chip.
  • the constant current control unit is configured to divide the backlight LED into several regions, and control the division of the backlight LEDs in multiple regions according to a dimming control signal processed by the data processing control chip. Time out.
  • the high-voltage isolation switch control unit is configured to set a maximum voltage value of the constant current control unit.
  • the backlight LEDs are arranged in a matrix, and each row of backlight LEDs constitutes a backlight LED area.
  • the negative electrodes of the backlight LEDs in the same column are connected and connected to a high-voltage isolation switch control unit.
  • the high-voltage isolation switch control unit includes a MOS tube, a first resistor, and a second resistor, a drain of the MOS tube is connected to a negative electrode of the backlight LED, and a gate of the MOS tube One end of the first resistor and one end of the second resistor, the source of the MOS tube is connected to the constant current control unit, the other end of the first resistor is grounded, and the other end of the second resistor is connected to a DC power source.
  • the MOS tube is an NMOS tube.
  • a voltage value of the DC power source is smaller than a maximum withstand voltage value of the constant current control unit.
  • a dimming control method using a backlight dimming control system as described above includes the following steps:
  • the data processing control chip receives and processes the dimming control signal sent by the main control chip
  • the data processing control chip sends the processed dimming control signal to the constant current control module, and sends a line switch signal of a specific timing to the line scanning unit circuit;
  • the line scanning unit circuit controls the positive polarity of the backlight LEDs in multiple areas to be turned on in a time-sharing manner according to the line switching signals of a specific timing sent by the data processing control chip;
  • the constant current control module divides the backlight LED into several areas, and controls the time division quantity of the backlight LEDs in multiple areas according to the dimming control signal processed by the data processing control chip.
  • a display device includes a dimming control system for a backlight as described above, and the display device performs dimming by using the dimming control method described above.
  • the present invention provides a dimming control system, a dimming control method and a display device for a backlight.
  • the system includes a main control chip, a data processing control chip, a power supply module, at least one line scanning unit circuit, and at least one constant current control module.
  • the data processing control chip sends the processed dimming control signal to the constant current control module, and sends the line switching signal of a specific timing to the line scanning unit circuit, and then the line scanning unit circuit sends the specific
  • the sequential line switching signals control the positive polarity of the backlight LEDs in multiple areas to be turned on in a time-sharing manner.
  • the backlight LED is divided into several areas by the constant current control module, and the multiple areas are controlled according to the dimming control signals processed by the data processing control chip.
  • the time-division of the backlight LED is turned off, so that a constant current channel can be controlled in multiple partitions, a small number of channels can be controlled in multiple partitions, which can achieve the effect of multiple channels and multiple partitions, reduce costs, facilitate control of the dimming system, and increase Increased product reliability and stability.
  • FIG. 1 is a structural block diagram of a dimming control system for a backlight source provided by the present disclosure.
  • FIG. 2 is a schematic diagram of a line scanning unit circuit in a dimming control system of a backlight source provided by the present disclosure.
  • FIG. 3 is a schematic diagram of the high-voltage isolation switch control unit in a dimming control system for a backlight source provided by the present disclosure.
  • FIG. 4 is a timing control diagram of a row scan switch in a dimming control system of a backlight source provided by the present disclosure.
  • FIG. 5 is a flowchart of a backlight dimming control method provided by the present disclosure.
  • the present disclosure provides a dimming control system, a dimming control method, and a display device for a backlight.
  • a backlight dimming control system provided by the present disclosure includes a main control chip 10, a data processing control chip 20, a power supply module 30, at least one line scanning unit circuit 40, and at least one constant current control module. 50.
  • the main control chip 10 is connected to the data processing control chip 20.
  • the data processing control chip 20 is connected to the line scanning unit circuit 40 and the constant current control module 50.
  • the power supply module 30 is connected to the main control chip 10 and data. Process control chip 20.
  • the main control chip 10 is configured to generate a dimming control signal and send it to the data processing control chip 20 to determine the number of partitions; the data processing control chip 20 is configured to receive dimming of the main control chip 10
  • the control signal is processed and sent to the constant current control module 50, and sends a specific timing line switch signal to the line scanning unit circuit 40.
  • the data processing control chip 20 is set with a communication protocol, which can be an SPI communication protocol, an I2C protocol Or a two-wire or multi-wire protocol.
  • the data processing control chip 20 accepts the dimming control signals (including the backlight brightness signal and the zone control signal) sent by the main control chip 10, and after the data processing control chip 20 processes, Sends out control signals to drive and control the line scanning unit circuit 40 and the constant current control module 50; the power supply module 30 is used to supply power to the main control chip 10, the data processing control chip 20 and the backlight LED; The positive electrode of the backlight LEDs in a plurality of areas is switched on in a time-sharing manner according to a row switch signal of a specific timing sent by the data processing control chip 20.
  • the element circuit 40 is connected to a plurality of backlight LED regions, and the row switching signals of the specific timing will cause the positive poles of the respective backlight LED regions to be turned on in a time-sharing manner, thereby achieving the purpose of multi-zone control of a small number of constant current channels;
  • the constant current control module 50 It is used to divide the backlight LED into several areas, and control the time division of the backlight LEDs in multiple areas according to the dimming control signal processed by the data processing control chip 20.
  • the brightness of the LED light is controlled by the dimming control signal, and According to the different on-times of the positive poles of the backlight LEDs in the multiple areas, the constant current control module 50 controls the amount of backlight LEDs in multiple areas to be turned off at different times.
  • the effect of multiple channels and multiple partitions, wherein the number of the constant current control modules 50 may be one or more, and is the same as the number of the line scanning unit circuits 40.
  • the line scanning unit circuit 40 includes a plurality of line scan switches (indicated by SW1, SW2, ..., SWn in FIG. 2), and one end of each line scan switch is connected to a power supply. Module 30. The other end of each line scan switch is connected to the positive pole of a backlight LED area. The control end of each line scan switch is connected to the data processing control chip 20.
  • the line scan unit circuit 40 When the line scan unit circuit 40 is turned on, the power supply voltage provides the LED with a positive pole. Voltage.
  • the constant current control module 50 When the constant current control module 50 is activated, the constant current channel is opened to illuminate the LED lamp, and the brightness of the lamp is controlled by the brightness data signal.
  • each scan switch of the line scan unit circuit 40 is controlled by a line switch signal sent by the data processing control chip 20.
  • the line switch signal controls the conduction of different line scan switches in different periods, so that the backlight in different areas
  • the positive electrode of the LED is turned on at different times, and then the amount of the turned-on backlight LED area is controlled by the constant current control module 50 to control the brightness of the LED light.
  • the data processing control chip 20 is specifically configured to receive and process the dimming control signals of the main control chip 10, and generate N line switch signals according to the number of the line scan switches in the line scan unit circuit 40 and send them to the Corresponding line scan switches in the line scan unit circuit 40, in which the time when any two line switch signals are high-level signals are different, and N represents the number of line scan switches.
  • the sum of the durations of the N high-level signals of the row switching signals is the period of the field synchronization signal of a dimming control signal.
  • the present disclosure adopts a time-division scanning multiplexing method.
  • the time-division scanning multiplexing is to refresh the data multiple times through timing control within a certain period of time, and refresh the data several times with a few scans to achieve a constant
  • the flow control module controls the purpose of multiple partitions. In order to achieve more than one control, it is necessary to connect several scans, that is, the negative ends of several street lights are connected together. If it is designed to be 3 scans, the negative ends of the three rows of LEDs in the first column are connected together, and the positive ends of each zone Controlled by row switch signals.
  • the data processing control chip 20 After the data processing control chip 20 receives the signal from the main control chip 10, the data processing control chip 20 accepts the data, and uses the Vsync (field synchronization signal) time as a reference.
  • Vsync field synchronization signal
  • a Vsync cycle is divided into N parts, starting from the line scan switch SW1, the SW1 switch is turned on, and all the corresponding LED1_1 to LED1_N are connected to the positive pole of the power supply, and then the data that needs to be turned on are turned on according to the data signal.
  • the opening time of SW1 reaches the Vsync / N time, turn off SW1, and then turn on the scan switch SW2.
  • the LED2_1 to LED2_N corresponding to SW2 are connected to the positive pole of the power supply, and then according to the data signal, open the channel that needs to be opened.
  • a round-robin cycle is implemented to realize N-scan multiplexing.
  • the constant current control module 50 includes a constant current control unit 501 and a high-voltage isolating switch control unit 502.
  • the high-voltage isolating switch control unit 502 connects a negative electrode of a backlight LED and a constant-current control unit 501 in multiple regions.
  • the constant current control unit 501 is further connected to a data processing control chip 20.
  • the constant current control unit 501 may be a constant current control chip, which is configured to divide the backlight LED into several regions, and control the backlight LEDs in multiple regions according to a dimming control signal processed by the data processing control chip. Time-division quantity is turned off; the high-voltage isolating switch control unit 502 is used to set the highest voltage value of the constant current control unit 501 to protect the constant current control unit 501 from being damaged by overvoltage.
  • the backlight LEDs are arranged in a matrix type. Each row of backlight LEDs constitutes a backlight LED area.
  • the negative electrodes of the backlight LEDs in the same column are connected and connected to the high-voltage isolating switch control unit 502, so as to achieve the purpose of multiple control.
  • the high-voltage isolation switch control unit 502 includes a MOS tube Q1, a first resistor R1, and a second resistor R2.
  • a drain of the MOS tube Q1 is connected to a negative electrode of a backlight LED, and a gate of the MOS tube Q1.
  • the source of the MOS transistor Q1 is connected to the constant current control unit 501, the other end of the first resistor R1 is grounded, and the other end of the second resistor R2 Connect DC power.
  • the constant current control unit 501 when the constant current control unit 501 is turned on, the voltage here is low.
  • the constant current control unit 501 When the constant current control unit 501 is turned off, the negative terminal voltage of the constant current control unit is the positive terminal voltage of the backlight LED. This voltage As the number of LEDs in series determines the voltage level, the voltage value here continues to rise, and the GS threshold voltage of the MOS tube Q1 continues to decrease until it rises below the GS threshold voltage, and the MOS tube Q1 is turned off, thereby protecting the purpose.
  • the MOS tube is an NMOS tube, and the voltage value of the DC power source is set according to the maximum withstand voltage value of the constant current control unit. The voltage value of the DC power source is selected to be smaller than the maximum withstand voltage value of the constant current control unit.
  • the present disclosure also provides a backlight dimming control method. Please refer to FIG. 5, which includes the following steps:
  • the data processing control chip receives and processes the dimming control signal sent by the main control chip;
  • the data processing control chip sends the processed dimming control signal to the constant current control module, and sends a line switch signal of a specific timing to the line scanning unit circuit;
  • the line scan unit circuit controls the positive polarity of the backlight LEDs in multiple regions to be turned on in a time-sharing manner according to the line switching signals of a specific timing sent by the data processing control chip.
  • the constant current control module divides the backlight LED into a plurality of areas, and controls the time-division of the backlight LEDs in multiple areas according to the dimming control signal processed by the data processing control chip.
  • the positive electrodes of the backlight LEDs in multiple regions are controlled in a time-sharing manner by using a line scanning unit circuit, so that the constant current control module can control the quantity of backlight LEDs in multiple regions in a time-sharing manner, thereby achieving a constant
  • the flow channel controls multiple partitions to achieve the effect of multiple channels and multiple partitions. Since the dimming control system of the backlight has been described in detail above, it will not be repeated here.
  • the present disclosure also correspondingly provides a display device.
  • the display device includes the backlight dimming control system according to the foregoing embodiment.
  • the display device Dimming is performed by using the dimming control method described in the above embodiment.
  • the system includes a main control chip, a data processing control chip, a power supply module, at least one line scanning unit circuit, and At least one constant current control module.
  • the data processing control chip sends the processed dimming control signal to the constant current control module, and sends a row switch signal of a specific timing to the row scanning unit circuit, and then the row scanning unit circuit according to the data
  • the row switch signal of the specific timing sent by the control chip is used to control the positive polarity of the backlight LEDs in multiple regions to be turned on in a time-sharing manner.
  • the backlight LED is divided into several regions by the constant current control module, and the dimming after the chip processing is controlled according to the data processing.
  • the control signal controls the time-division of the backlight LEDs in multiple areas, thereby achieving a constant current channel to control multiple partitions, achieving a small number of channels and multiple partitions, achieving the effect of multiple channels and multiple partitions, reducing costs and facilitating dimming.
  • the control of the system but also increases the reliability and stability of the product.
  • the present invention provides a backlight dimming control system, a dimming control method and a display device.
  • a data processing control chip sends a processed dimming control signal to a constant current control module, and sends a row switch signal of a specific timing to The line scanning unit circuit, and then the line scanning unit circuit controls the positive polarity of the backlight LEDs in multiple areas to be turned on in a time-sharing manner according to the line switching signals of a specific timing, and is controlled by the constant current control module according to the dimming control signal processed by the data processing control chip
  • the backlight LEDs of multiple areas are time-divisioned, so that a constant current channel can be controlled in multiple partitions, a small number of channels can be controlled in multiple partitions, and the effect of multiple channels and multiple partitions can be achieved, which reduces costs and facilitates control of the dimming system. , And increase the reliability and stability of the product.

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

Abstract

L'invention concerne un circuit de commande de gradation et un procédé de commande de gradation pour une source de rétroéclairage, et un dispositif d'affichage. Le système comprend une puce de commande maîtresse (10), une puce de commande de traitement de données (20), un module d'alimentation électrique (30), au moins un circuit d'unité de balayage de rangées (40), et au moins un module de commande de courant constant (50). La puce de commande de traitement de données (20) transmet un signal de commande de gradation traité au module de commande de courant constant (50) et transmet un signal de commutation de rangée d'un minutage spécifique au circuit d'unité de balayage de rangées (40), puis le circuit d'unité de balayage de rangées (40) commande la connexion par répartition temporelle d'électrodes positives de DEL de rétroéclairage de multiples zones sur la base du signal de commutation de rangée du minutage spécifique, et le module de commande de courant constant (50) commande la mise sous/hors tension par répartition temporelle des DEL de rétroéclairage des multiples zones sur la base du signal de commande de gradation traité par la puce de commande (20), mettant ainsi en œuvre la commande de multiples zones par un seul canal de courant constant, mettant en œuvre la commande de multiples zones par un petit nombre de canaux, obtenant l'effet de multiples canaux et de multiples zones, réduisant les coûts, facilitant la commande d'un système de gradation, et augmentant la fiabilité et la stabilité d'un produit.
PCT/CN2018/113594 2018-09-21 2018-11-02 Système de commande de gradation et procédé de commande de gradation pour source de rétroéclairage, et dispositif d'affichage WO2020056872A1 (fr)

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CN201811107385.6 2018-09-21
CN201811107385.6A CN109166532A (zh) 2018-09-21 2018-09-21 一种背光源的调光控制系统、调光控制方法及显示装置

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CN114023273B (zh) * 2021-11-22 2023-03-21 深圳创维－Rgb电子有限公司 局域调光驱动电路、方法、系统及电子设备
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CN114333714A (zh) * 2021-12-31 2022-04-12 上海中航光电子有限公司 一种背光模组及其调光方法、显示装置
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