WO2022223030A1 - 背光驱动装置、图像显示设备和背光驱动方法 - Google Patents

背光驱动装置、图像显示设备和背光驱动方法 Download PDF

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Publication number
WO2022223030A1
WO2022223030A1 PCT/CN2022/088539 CN2022088539W WO2022223030A1 WO 2022223030 A1 WO2022223030 A1 WO 2022223030A1 CN 2022088539 W CN2022088539 W CN 2022088539W WO 2022223030 A1 WO2022223030 A1 WO 2022223030A1
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WIPO (PCT)
Prior art keywords
backlight
data
driver
driving
image
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PCT/CN2022/088539
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English (en)
French (fr)
Inventor
张玉欣
杜强
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海信视像科技股份有限公司
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Publication of WO2022223030A1 publication Critical patent/WO2022223030A1/zh

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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
    • 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

Definitions

  • the present application relates to the field of display technology, and in particular, to a backlight driving device, an image display device and a backlight driving method.
  • image display devices have been widely used in all walks of life.
  • liquid crystal displays are used in televisions to display screen images.
  • the image display device is usually provided with a display panel and a backlight.
  • the display panel is used to display a picture image based on the received image data
  • the backlight is used to provide a backlight for the display panel under the driving of a backlight driver.
  • the backlight source is usually divided into many backlight partitions, such as hundreds of backlight partitions or even thousands of backlight partitions. Each partition needs to control its brightness separately. When the number of partitions is large, it leads to too many cables connecting the light source.
  • the LED lamps of different backlight partitions require different backlight drivers to control their backlight brightness individually, resulting in too many cables connecting the backlight driver and the LED lamps, resulting in complex interleaving of the connection cables.
  • an embodiment of the present application provides a backlight driving device, comprising: a backlight data processing module and a plurality of backlight driver groups, each backlight driver group is connected to the backlight data processing module through a serial bus; each backlight driver group is connected to the backlight data processing module through a serial bus;
  • the driver group includes at least one backlight driver, and each backlight driver corresponds to driving at least one backlight partition of the backlight source;
  • the backlight data processing module is used to determine the backlight drive data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device, and send the corresponding backlight driver group through each serial bus to the corresponding backlight driver group.
  • Backlight driving data corresponding to the backlight driver; the partition brightness information is determined by the image processing apparatus according to the image data to be displayed.
  • each backlight driver group includes a plurality of backlight drivers, and each backlight driver group is connected to the backlight data processing module through a serial bus, instead of requiring each backlight driver to pass a line Therefore, the number of connecting cables in the backlight driving system can be greatly reduced, and the complexity of the backlight driving system can be effectively reduced.
  • the backlight data processing module sends backlight driving data to a corresponding backlight driver group through each serial bus based on a synchronization signal transmitted by the image processing device; the synchronization signal is the image
  • the processing device is used to control the synchronization signal for the display panel to display based on the image data.
  • the backlight data processing module receives the partition brightness information determined by the image processing device according to the image data to be displayed, and the backlight data processing module can determine the backlight drive data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device. , and based on the synchronization signal transmitted by the image processing device, send the backlight drive data corresponding to the backlight driver in the backlight driver group to the corresponding backlight driver group through each serial bus, which can ensure that each backlight driver receives the corresponding backlight. Time synchronization of drive data.
  • the backlight driver drives the corresponding backlight partitions according to the received backlight driving data, which can ensure that the brightness changes of the respective backlight partitions are basically synchronized.
  • the image processing device controls the display panel to display the image according to the image data based on the synchronization signal, so as to ensure that the brightness change of each backlight partition corresponds to the content change of the image displayed by the display panel, thereby improving the display effect of the image display device.
  • the backlight data processing module includes a cache unit, a data calculation unit and a data distribution unit;
  • the cache unit is used to cache the partition brightness information transmitted by the image processing device
  • the data calculation unit is configured to obtain the partition brightness information from the cache unit, and determine the backlight drive data corresponding to each backlight driver according to the partition brightness information;
  • the data distribution unit is used for distributing each backlight driving data to the bus interface of the corresponding serial bus.
  • the partition brightness information transmitted by the image processing device is first buffered in the buffer unit, and data can be extracted from the buffer for processing and transmission according to time requirements, which is beneficial to make the timing of sending the backlight driving data more consistent with the synchronization signal.
  • the bus interface of each serial bus sends the backlight driving data as follows:
  • a data frame is sent to the corresponding backlight driver group through the serial bus; the data frame includes sequentially arranged driving data, and the driving data is the backlight driver group connected by the serial bus.
  • Backlight driving data corresponding to each backlight driver in the .
  • the data frame further includes check data, the check data is a checksum of all driving data in the data frame, and the check data is located at the head of the data frame or tail.
  • the checksum of all driving data is added in the data frame as check data, which can realize frame check and ensure the integrity and accuracy of the transmitted backlight driving data.
  • some or all of the backlight driver set includes a plurality of backlight drivers connected in series.
  • each data frame further includes the driver address, register address and data length of the backlight drivers in the backlight driver group; each backlight driver group, according to the driver address and register address in the received data frame, The backlight driving data corresponding to each backlight driver is written into the corresponding register, and each backlight driver generates a driving signal to drive the corresponding backlight partition according to the backlight driving data in the corresponding register.
  • the data frame includes the driver address and register address of the backlight driver, which can ensure that each backlight driving data is accurately sent to the corresponding backlight driver and stored in the corresponding register.
  • the backlight driving data corresponding to each backlight driver includes backlight current amplitude and PWM duty cycle data.
  • the backlight driver is disposed on a backlight panel on which the backlight source is mounted.
  • each backlight driver is installed on the backlight board of the backlight source, and there is no need to connect with the backlight source through connecting cables, which greatly reduces the number of connecting cables in the backlight driving system, which can effectively reduce the backlight driving system. complexity.
  • an embodiment of the present application provides an image display device, including an image processing device, a backlight driving device, a display panel, and a backlight source connected in sequence; the backlight driving device adopts the backlight driving device described in the first aspect;
  • the image processing device is configured to transmit partition brightness information to the backlight driving device according to the image data to be displayed, transmit a synchronization signal to the backlight driving device, and control the display panel according to the image data based on the synchronization signal data display;
  • the backlight source is used to provide backlight for the display panel, and has a plurality of backlight partitions.
  • an embodiment of the present application provides a backlight driving method, which is performed by a backlight driving device, and the method includes:
  • the partition brightness information transmitted by the image processing device determine the backlight drive data corresponding to each backlight driver; wherein each backlight driver is used to drive at least one backlight partition of the backlight source according to the corresponding backlight drive data; the partition brightness information is The image processing device is determined according to the image data to be displayed;
  • the backlight driving data corresponding to the backlight drivers in the backlight driver group is respectively sent to the corresponding backlight driver group through each serial bus; wherein each backlight driver group includes at least one backlight a driver; the synchronization signal is a synchronization signal used by the image processing device to control the display panel to display based on the image data.
  • the bus interface of each serial bus sends the backlight driving data as follows:
  • a data frame is sent to the corresponding backlight driver group through the serial bus; the data frame includes sequentially arranged driving data, and the driving data is the backlight driver group connected by the serial bus.
  • Backlight driving data corresponding to each backlight driver in the .
  • the data frame further includes check data, the check data is a checksum of all driving data in the data frame, and the check data is located at the head of the data frame or tail.
  • FIG. 1 shows a schematic structural diagram of an image display device of the related art
  • FIG. 2 shows a schematic diagram of a liquid crystal television set provided by an embodiment of the present application
  • FIG. 3 shows a schematic block diagram of the backlight control of an image display device provided by an embodiment of the present application
  • FIG. 4 shows a schematic structural diagram of a backlight driving device provided by an embodiment of the present application
  • FIG. 5 shows a schematic structural diagram of another backlight driving device provided by an embodiment of the present application.
  • FIG. 6 shows a schematic structural diagram of a lamp driver integrated board provided by an embodiment of the present application.
  • FIG. 7 shows a schematic structural diagram of a backlight data processing module provided by an embodiment of the present application.
  • FIG. 8 shows a sequence diagram of data transmission through a serial bus provided by an embodiment of the present application.
  • FIG. 9 shows a schematic diagram of a format of a serially transmitted data frame provided by an embodiment of the present application.
  • FIG. 10 shows a schematic diagram of the format of another serially transmitted data frame provided by an embodiment of the present application.
  • FIG. 11 shows a schematic diagram of a serial bus transmission of data provided by an embodiment of the present application.
  • FIG. 12 shows a schematic diagram of the format of another serially transmitted data frame provided by an embodiment of the present application.
  • FIG. 13 shows a schematic flowchart of a backlight driving method provided by an embodiment of the present application.
  • the liquid crystal display device is mainly composed of a backlight module and a liquid crystal display panel.
  • the liquid crystal display panel itself does not emit light, and needs to rely on the light source provided by the backlight module to achieve brightness display.
  • the imaging principle of the liquid crystal display device is to place the liquid crystal between two pieces of conductive glass, driven by the electric field between the two electrodes, to cause the electric field effect of the liquid crystal molecules to twist, so as to control the transmission or shielding function of the backlight source, so as to display the image. come out. If a color filter is added, color images can be displayed.
  • the backlight partition adjustment technology is a technology that divides the backlight into multiple regions (ie, partitions), and adjusts the backlight for different regions of the backlight respectively.
  • This technology adjusts the brightness of the backlight according to the image corresponding to the partition of the backlight.
  • This technology greatly improves the quality of the liquid crystal display. In general, the more partitions, the better the display effect. . However, with the increase of partitions, the control of the backlight part becomes complicated accordingly.
  • the backlight source is usually divided into many backlight partitions, such as hundreds of backlight partitions or even thousands of backlight partitions. Each partition needs to control its brightness separately. When the number of partitions is large, it will lead to too many cables connecting the light source.
  • the LED lamps of different backlight partitions require different backlight drivers to control their backlight brightness individually, resulting in too many cables connecting the backlight driver and the LED lamps, resulting in complex interleaving of the connection cables.
  • the image display device in the related art is usually provided with a plurality of backlight data processing modules.
  • the image display device shown in FIG. 1 includes a plurality of MCUs (Micro Control Units) connected to the image display device.
  • MCUs Micro Control Units
  • each MCU is a backlight data processing module, and each MCU is powered by a DC/DC power supply.
  • Each MCU is connected to a part of the backlight driver, and each MCU receives the backlight information corresponding to the backlight partition sent by the image display device, generates backlight driving data and sends it to the backlight driver corresponding to the backlight partition, and the backlight driver drives the corresponding backlight according to the backlight driving data sent by the MCU. partition.
  • each MCU transmits the backlight driving data to the backlight driver connected to it respectively, the time when the backlight driving data is transmitted to each backlight driver will be asynchronous, which will lead to inconsistent brightness changes of each backlight partition.
  • the content of the screen image displayed by the panel does not correspond to the change, thereby affecting the display effect of the screen image.
  • embodiments of the present application provide a backlight driving apparatus, an image display device, and a backlight driving method.
  • the image display device 10 in the present application may be a TV, a computer or other electronic devices.
  • the following description will take a TV as an example.
  • the LCD TV includes a display panel 500 .
  • FIG. 3 The schematic block diagram of the backlight control of the image display device 10 is shown in FIG. 3 .
  • the image processing device 100 receives the image signal to be displayed, that is, the TV signal, and after performing image processing on the image signal, outputs the image data to the timing controller 300, and outputs the global brightness information and the partition brightness information to the backlight driving device 200 to drive the backlight source. 400 realizes backlight brightness control.
  • the global brightness information may be determined by the image processing apparatus 100 according to the image data to be displayed, or may be set by the user. For example, the user may adjust the backlight brightness of the LCD TV 10 through a remote control.
  • the global brightness information is usually a PWM (Pulse Width Modulation, pulse width modulation) signal.
  • the image processing apparatus 100 may transmit the global brightness information to the backlight driving apparatus 200 through the PWM signal line; in other embodiments, the image processing apparatus 100 may transmit the global brightness information to the backlight through the I 2 C bus Drive device 200 .
  • the partition brightness information is determined by the image processing device 100 according to the image data to be displayed and the partition situation of the backlight source, and can be transmitted through an SPI (Service Provider Interface, service provider interface) bus, which is a type of serial bus.
  • SPI Service Provider Interface, service provider interface
  • the image processing device 100 performs image processing on the image signal, it generates two parts of information: one part is image data, the image data is transmitted to the timing controller 300, and the timing controller 300 controls the display panel 500 to display the corresponding information based on the image data.
  • TV screen image the other part is backlight brightness information, including global brightness information and partition brightness information.
  • the backlight brightness information is transmitted to the backlight driving device 200, and the backlight driving device 200 drives the backlight source 400 to provide backlight for the display panel 500 based on the backlight brightness information.
  • the backlight source 400 may use an LED lamp as a light source.
  • the image processing apparatus 100 respectively transmits image data to the timing controller 300 and transmits the partition brightness information to the backlight driving apparatus 200 based on the same synchronization signal.
  • the synchronization signal is sent to the timing controller 300 and the backlight driving device 200, so that the timing controller 300 controls the display panel 500 to display an image based on the synchronization signal, and the backlight driving device 200 drives the backlight source based on the same synchronization signal. Therefore, it can be ensured that the change of the brightness of the backlight is consistent with the content change of the screen image displayed by the display panel, and the display effect of the image display device is improved.
  • the internal structure of the backlight driving apparatus 200 may be as shown in FIG. 4 , the backlight driving apparatus 200 includes a backlight data processing module 210 and a plurality of backlight drivers 221 , each backlight driver 221 correspondingly drives the One backlight partition of the backlight source 400 .
  • the plurality of backlight drivers 221 are divided into a plurality of backlight driver groups, each backlight driver group includes at least one backlight driver, and each backlight driver group is connected to the backlight data processing module 210 through a serial bus.
  • each backlight driver group includes a plurality of backlight drivers 221 connected in series. In other embodiments, some backlight driver groups may include only one backlight driver 221 , or each backlight driver group may include only one backlight driver 221 .
  • each backlight driver group includes a plurality of backlight drivers, and each backlight driver group is connected to the backlight data processing module through a serial bus, instead of requiring each backlight driver to pass a line Therefore, the number of connecting cables in the backlight driving system can be greatly reduced, and the complexity of the backlight driving system can be effectively reduced.
  • the backlight data processing module 210 can determine the backlight driving data corresponding to each backlight driver 221 based on the corresponding relationship between the backlight driver and the backlight partition of the backlight source according to the global brightness information and the partition brightness information transmitted by the image processing apparatus 100 in FIG. 3 .
  • the backlight driver 221 may also be referred to as a PWM driver.
  • the backlight data processing module 210 Based on the synchronization signal transmitted by the image processing device 100, the backlight data processing module 210 sends the corresponding backlight driver data of the backlight driver in the backlight driver group to the corresponding backlight driver group through each serial bus, and transmits the synchronization signal to each backlight driver group.
  • a backlight driver group Based on the synchronization signal transmitted by the image processing device 100, the backlight data processing module 210 sends the corresponding backlight driver data of the backlight driver in the backlight driver group to the corresponding backlight driver group through each serial bus, and transmits the synchronization signal to each backlight driver group.
  • each backlight driver 221 receives the corresponding backlight driving data is basically synchronized.
  • the backlight driver 221 drives the corresponding backlight partitions according to the received backlight driving data, which can ensure that the brightness changes of the backlight partitions are consistent.
  • the backlight driving device is provided with a plurality of backlight drivers, each backlight driver corresponds to driving at least one backlight partition of the backlight source, the plurality of backlight drivers are divided into a plurality of backlight driver groups, and each backlight driver group communicates with the backlight data through a serial bus. Handling module connections.
  • the backlight data processing module receives the partition brightness information determined by the image processing device according to the image data to be displayed, and the backlight data processing module can determine the backlight drive data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device, and based on the image processing
  • the synchronization signal transmitted by the device sends the corresponding backlight driver data to the corresponding backlight driver group through each serial bus respectively, which can ensure the time synchronization of each backlight driver receiving the corresponding backlight driver data.
  • the backlight driver drives the corresponding backlight partitions according to the received backlight driving data, which can ensure that the brightness changes of each backlight partition are basically synchronized.
  • the image processing device controls the display panel to display the image according to the image data based on the synchronization signal, so as to ensure that the brightness change of each backlight partition corresponds to the content change of the image displayed by the display panel, thereby improving the display effect of the image display device.
  • the internal structure of the backlight driver 200 is shown in FIG. 5 , the backlight drivers belonging to the same backlight driver group are installed on the same lamp driver integrated board 220 , and the backlight drivers belonging to different backlight driver groups are installed on different lamp driver integrated boards 220 .
  • the light driver integrated board 220 is also a light board for installing the backlight.
  • the backlight data processing module 210 transmits the backlight drive data corresponding to the backlight driver in each backlight driver group to each backlight driver in the backlight driver group through the serial bus, and transmits the synchronization signal to the backlight through the synchronization signal line respectively.
  • Each backlight driver in the driver group is shown in FIG. 5 , the backlight drivers belonging to the same backlight driver group are installed on the same lamp driver integrated board 220 , and the backlight drivers belonging to different backlight driver groups are installed on different lamp driver integrated boards 220 .
  • the light driver integrated board 220 is also a light board for installing the backlight.
  • the backlight data processing module 210 transmits
  • the backlight driver needs to be connected to the LED lamp of the corresponding driven backlight partition through a connecting cable.
  • the connecting cable By connecting the LED lamp with the connecting cable, the number of connecting cables in the backlight driving system is greatly reduced, and the complexity of the backlight driving system can be effectively reduced.
  • each backlight driver 221 includes an SDI pin and an SDO pin, that is, a data input pin and a data output pin.
  • the SDI pin of the first backlight driver 221 is connected with the SDI port of the serial bus connection port
  • the SDO pin of each backlight driver is connected with the SDI pin of the next backlight driver
  • the SDO pin of the last backlight driver is connected with the serial bus
  • the SDO port of the row bus connection port is connected, so that the closed-loop transmission of data can be completed.
  • each backlight driver 221 is connected to the VSYNC port of the serial bus connection port for receiving synchronization signals, and each backlight driver 221 is provided with IC pins, which are respectively connected to the SCK port of the serial bus connection port for synchronization. clock signal.
  • the content structure of the backlight data processing module 210 is shown in FIG.
  • the SPI communication unit 211 is configured to receive the partition brightness information transmitted by the image processing apparatus 100 through the SPI bus, and buffer the received partition brightness information into the buffer unit 212 .
  • other types of bus communication units may also be used to replace the SPI communication unit 211 for receiving partition brightness information.
  • the cache unit 212 may use RAM memory to cache the partition brightness information.
  • the data calculation unit 213 is configured to obtain the partition brightness information from the cache unit 212, and determine the backlight drive data corresponding to each backlight driver according to the partition brightness information and the global brightness information transmitted by the image processing device 100, The backlight driving data are all transmitted to the data distribution unit 214 .
  • the data distribution unit 214 is used to distribute each backlight driving data to the bus interface of the corresponding serial bus, that is, to the corresponding SPI transceiver unit 215, and each SPI transceiver unit 215 passes the received backlight drive data through the serial bus. It is transmitted to the backlight driver 221 installed on the corresponding lamp driver integrated board.
  • the bus interface of the serial bus can also be other types of transceiver units.
  • the embodiments of the present application provide a one-to-many serial bus distribution method, which can distribute backlight driving data from one backlight data processing module to multiple integrated lamp driving boards through multiple serial buses based on synchronization signals.
  • the buffer unit 212 is set up. Based on the pipeline data distribution method of RAM buffer, in one data transmission frame, the serial bus data received by the SPI communication unit 211 is stored. , through the RAM cache, the data is distributed to the multi-channel SPI transceiver unit 215 in real time.
  • the backlight data processing module 210 of the embodiment of the present application completes the statistics, gain calculation and partition position mapping of all backlight data according to the global brightness information and the partition brightness information, and distributes the data to a plurality of Backlight driver groups, each backlight driver group may specifically be a lamp driver integrated board 220 .
  • the serial data sent to each light driver integrated board 220 may include a driver address (DevAddr), a register address (RegAddr), a data length (Length) and data (Data1-DataN).
  • the data (Data1-DataN) are backlight driving data, which may include PWM duty cycle data and backlight current amplitude.
  • the backlight data processing module 210 transmits the PWM duty cycle data and the backlight current amplitude to the corresponding backlight driver through this data format, and the backlight driver can generate multiple channels of PWM control according to the synchronization signal, the PWM duty cycle data and the backlight current amplitude.
  • the signal is sent to the corresponding backlight partition in the backlight source for brightness control.
  • the bus interface of the serial bus can send data according to the timing shown in FIG. 8 : at each rising edge of the synchronization signal SYNC, the enable signal DEN rises to a high level, data transmission is enabled, and data frame transmission begins.
  • the data frame includes backlight driving data corresponding to N RAM buffers, and the backlight driving data corresponding to each RAM buffer is transmitted in turn in turn.
  • the enable signal DEN drops to a low level, ends the data transmission, waits for the next synchronization signal SYNC, and then rises to a high level.
  • each serial bus sends the backlight driving data in the following manner: in response to a synchronization signal, a data frame is sent through the serial bus.
  • the data frame includes sequentially arranged driving data, and the driving data is backlight driving data corresponding to each backlight driver in the backlight driver group connected to the serial bus.
  • a data frame is transmitted between one synchronization signal SYNC and the next synchronization signal SYNC, and the data frame includes N backlight driving data from Data1 to DataN, corresponding to N backlight partitions the backlight drive data.
  • each data frame may include backlight driving data of backlight partitions of M rows*N columns in total from Data1 to DataM*N.
  • the data frame may further include check data, where the check data is the checksum of all drive data in the data frame.
  • the position of the check data in the data frame can be the head or the tail.
  • FIG. 10 shows a data frame format of the drive data of a serial bus with a check mechanism.
  • SOH Start Of Heading, frame data header
  • CMD Command, command word
  • EOF End Of Frame, frame data tail
  • EOF can be a preset fixed number, or the checksum of all the data of the current frame, so as to realize the frame check and ensure the data integrity of the communication.
  • the serial bus can be completed with two signal lines, namely the data line SDI and the clock signal line SCK, as shown in Figure 11.
  • each data frame may further include driver addresses, register addresses and data lengths of the backlight drivers in the backlight driver group.
  • a data frame includes a driver address (DevAddr), a register address (RegAddr), a data length (Length) and data (Data1-DataN).
  • the data (Data1-DataN) are backlight driving data corresponding to the N backlight drivers, which may include PWM duty cycle data and backlight current amplitude.
  • Each backlight driver group writes the backlight drive data corresponding to each backlight driver into the corresponding register according to the driver address and register address in the received data frame, and each backlight driver generates a driver according to the backlight drive data in the corresponding register.
  • the signal drives the corresponding backlight partition.
  • the application embodiment also provides an image display device.
  • the image display device may include an image processing device 100, a backlight driving device 200, a timing controller 300, The backlight 400 and the display panel 500 .
  • the backlight driving apparatus 200 may adopt the backlight driving apparatus provided in the above embodiments.
  • the image processing device 100 is configured to transmit the partition brightness information to the backlight driving device 200 according to the image data to be displayed, transmit a synchronization signal to the backlight driving device 200, and control the display panel 500 to display according to the image data based on the synchronization signal.
  • the backlight driving device 200 is configured to drive the backlight source 400 to provide backlight for the display panel 500 based on the synchronization signal.
  • the backlight source 400 can use an LED lamp as a light source, and the backlight source 400 has a plurality of backlight partitions.
  • the image display device provided by the embodiment of the present application is provided with a plurality of backlight drivers, each backlight driver corresponds to at least one backlight partition for driving a backlight source, the plurality of backlight drivers are divided into a plurality of backlight driver groups, and each backlight driver group passes through a channel
  • the serial bus is connected with the backlight data processing module.
  • the backlight data processing module receives the partition brightness information determined by the image processing device according to the image data to be displayed, and the backlight data processing module can determine the backlight drive data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device, and based on the image processing
  • the synchronization signal transmitted by the device sends the corresponding backlight driver data to the corresponding backlight driver group through each serial bus respectively, which can ensure the time synchronization of each backlight driver receiving the corresponding backlight driver data.
  • the backlight driver drives the corresponding backlight partitions according to the received backlight driving data, which can ensure that the brightness changes of each backlight partition are consistent.
  • the image processing device controls the display panel to display the image according to the image data based on the synchronization signal, so as to ensure that the brightness change of each backlight partition corresponds to the content change of the image displayed by the display panel, thereby improving the display effect of the image display device.
  • the application embodiment also provides a backlight driving method, as shown in FIG. 13 , the method includes:
  • Step S1301 the backlight data processing module determines the backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device.
  • each backlight driver is used for driving at least one backlight sub-region of the backlight source according to corresponding backlight driving data; the sub-region brightness information is determined by the image processing apparatus according to the image data to be displayed.
  • Step S1302 the backlight data processing module transmits the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each serial bus based on the synchronization signal transmitted by the image processing device.
  • each backlight driver group includes at least one backlight driver;
  • the synchronization signal is a synchronization signal used by the image processing apparatus to control the display panel to display based on the image data.
  • a data frame may be sent through the serial bus; the data frame includes sequentially arranged driving data, and the driving data is the serial bus Backlight driving data corresponding to each backlight driver in the connected backlight driver group.
  • the embodiments of the present application may be provided as a method, apparatus, apparatus, system or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions
  • the apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

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Abstract

一种背光驱动装置（200）、图像显示设备（10）和背光驱动方法，属于显示技术领域。图像显示设备（10）中设置有至少一个背光驱动器组，每个背光驱动器组包括多个背光驱动器（221），每个背光驱动器组通过一路串行总线与背光数据处理模块（210）连接，而不需要每个背光驱动器（221）分别通过线缆与背光数据处理模块（210）连接，因此，可以大量减少背光驱动***中连接线缆的数量，有效降低背光驱动***的复杂度。其中，背光数据处理模块（210）根据图像处理装置（100）传输的分区亮度信息，确定每个背光驱动器（221）对应的背光驱动数据，并基于图像处理装置（100）传输的同步信号，分别通过每路串行总线向对应的背光驱动器组发送背光驱动数据，可以保证各个背光驱动器（221）接收到相应的背光驱动数据的时间同步。

Description

背光驱动装置、图像显示设备和背光驱动方法
相关申请的交叉引用
本申请要求于2021年04月22日提交中国专利局、申请号为202110437795.2、申请名称为“背光驱动装置、图像显示设备和背光驱动方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，具体涉及一种背光驱动装置、图像显示设备和背光驱动方法。
背景技术
目前，随着显示技术的发展，图像显示设备已经广泛应用于各行各业。例如，液晶显示器应用在电视中，用于显示画面图像。图像显示设备通常设置有显示面板和背光源，显示面板用于基于接收到的影像数据显示画面图像，背光源用于在背光驱动器的驱动下，为显示面板提供背光。
背光源通常分为很多个背光分区，比如几百个背光分区甚至上千个背光分区，每个分区需要单独控制其亮度，当分区数量较多时，导致连接光源的线缆太多。不同的背光分区的LED灯需要不同的背光驱动器单独控制其背光亮度，导致连接背光驱动器和LED灯的线缆过多，造成连接线缆的复杂交错。
发明内容
第一方面，本申请实施例提供一种背光驱动装置，包括：背光数据处理模块和多个背光驱动器组，每个背光驱动器组通过一路串行总线与所述背光数据处理模块连接；每个背光驱动器组包括至少一个背光驱动器，每个背光驱动器对应驱动背光源的至少一个背光分区；
所述背光数据处理模块用于根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据，并分别通过每路串行总线向对应的背光驱动器组发送该背光驱动器组中的背光驱动器对应的背光驱动数据；所述分区亮度信息是所述图像处理装置根据待显示的影像数据确定的。
本申请实施例设置有至少一个背光驱动器组，每个背光驱动器组包括多个背光驱动器，每个背光驱动器组通过一路串行总线与背光数据处理模块连接，而不需要每个背光驱动器分别通过线缆与背光数据处理模块连接，因此，可以大量减少背光驱动***中连接线缆的 数量，有效降低背光驱动***的复杂度。
在某些实施例中，所述背光数据处理模块基于所述图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组发送背光驱动数据；所述同步信号为所述图像处理装置用来控制显示面板基于所述影像数据进行显示的同步信号。
上述实施例中，背光数据处理模块接收图像处理装置根据待显示的影像数据确定的分区亮度信息，背光数据处理模块可以根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据，并基于图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组，发送该背光驱动器组中的背光驱动器对应的背光驱动数据，可以保证各个背光驱动器接收到相应的背光驱动数据的时间同步。背光驱动器根据接收到的背光驱动数据驱动对应的背光分区，可以保证各个背光分区的亮度变化基本同步。同时，图像处理装置基于该同步信号控制显示面板根据影像数据显示画面图像，从而可以保证各个背光分区的亮度变化与显示面板显示的画面图像的内容变化相对应，提高图像显示设备的显示效果。
在某些实施例中，所述背光数据处理模块包括缓存单元、数据计算单元和数据分发单元；
所述缓存单元用于缓存图像处理装置传输的分区亮度信息；
所述数据计算单元用于从所述缓存单元获取所述分区亮度信息，并根据所述分区亮度信息，确定每个背光驱动器对应的背光驱动数据；
所述数据分发单元用于将每个背光驱动数据分发至对应的串行总线的总线接口。
上述实施例中，将图像处理装置传输的分区亮度信息先缓存到缓存单元，可以根据时间需要从缓存中提取数据进行处理和传输，有利于使发送背光驱动数据的时刻能够与同步信号更吻合。
在某些实施例中，每路串行总线的总线接口均按照如下方式发送背光驱动数据：
响应于一个同步信号，通过所述串行总线向对应的背光驱动器组发送一个数据帧；所述数据帧包括顺次排列的驱动数据，所述驱动数据为所述串行总线连接的背光驱动器组中的每个背光驱动器对应的背光驱动数据。
在某些实施例中，所述数据帧还包括校验数据，所述校验数据为所述数据帧中所有驱动数据的校验和，所述校验数据位于所述数据帧的头部或尾部。
上述实施例中，在数据帧中增加所有驱动数据的校验和作为校验数据，可以实现帧校验，保证传输的背光驱动数据的完整性和准确性。
在某些实施例中，部分或全部背光驱动器组包括串行连接的多个背光驱动器。
在某些实施例中，每个数据帧中还包含背光驱动器组中的背光驱动器的驱动器地址、寄存器地址和数据长度；每个背光驱动器组根据接收到的数据帧中的驱动器地址和寄存器 地址，将每个背光驱动器对应的背光驱动数据写入对应的寄存器中，每个背光驱动器根据对应寄存器中的背光驱动数据生成驱动信号驱动相应的背光分区。
上述实施例中，数据帧中包含背光驱动器的驱动器地址和寄存器地址，可以保证将每个背光驱动数据均准确地发送至对应的背光驱动器，并保存至对应的寄存器中。
在某些实施例中，每个背光驱动器对应的背光驱动数据包括背光电流幅值和PWM占空比数据。
在某些实施例中，所述背光驱动器设置在用于安装所述背光源的背光板上。
上述实施例中，每个背光驱动器均安装在背光源的背光板上，不需要再通过连接线缆与背光源连接，大量减少了背光驱动***中连接线缆的数量，能够有效降低背光驱动***的复杂度。
第二方面，本申请实施例提供一种图像显示设备，包括依次连接的图像处理装置、背光驱动装置、显示面板和背光源；所述背光驱动装置采用第一方面所述的背光驱动装置；
所述图像处理装置用于根据待显示的影像数据向所述背光驱动装置传输分区亮度信息，并向所述背光驱动装置传输同步信号，以及基于所述同步信号控制所述显示面板根据所述影像数据进行显示；
所述背光源用于为所述显示面板提供背光，且具有多个背光分区。
第三方面，本申请实施例提供一种背光驱动方法，由背光驱动装置执行，所述方法包括：
根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据；其中，每个背光驱动器用于根据对应的背光驱动数据驱动背光源的至少一个背光分区；所述分区亮度信息是所述图像处理装置根据待显示的影像数据确定的；
基于所述图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组发送该背光驱动器组中的背光驱动器对应的背光驱动数据；其中，每个背光驱动器组包括至少一个背光驱动器；所述同步信号为所述图像处理装置用来控制显示面板基于所述影像数据进行显示的同步信号。
在某些实施例中，每路串行总线的总线接口均按照如下方式发送背光驱动数据：
响应于一个同步信号，通过所述串行总线向对应的背光驱动器组发送一个数据帧；所述数据帧包括顺次排列的驱动数据，所述驱动数据为所述串行总线连接的背光驱动器组中的每个背光驱动器对应的背光驱动数据。
在某些实施例中，所述数据帧还包括校验数据，所述校验数据为所述数据帧中所有驱动数据的校验和，所述校验数据位于所述数据帧的头部或尾部。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1示出相关技术的一种图像显示设备的结构示意图；
图2示出本申请实施例提供的一种液晶电视机的示意图；
图3示出本申请实施例提供的一种图像显示设备的背光控制原理框图；
图4示出本申请实施例提供的一种背光驱动装置的结构示意图；
图5示出本申请实施例提供的另一种背光驱动装置的结构示意图；
图6示出本申请实施例提供的一种灯驱一体板的结构示意图；
图7示出本申请实施例提供的一种背光数据处理模块的结构示意图；
图8示出本申请实施例提供的一种通过串行总线传输数据的时序图；
图9示出本申请实施例提供的一种串行传输的数据帧的格式示意图；
图10示出本申请实施例提供的另一种串行传输的数据帧的格式示意图；
图11示出本申请实施例提供的一种串行总线传输数据的示意图；
图12示出本申请实施例提供的另一种串行传输的数据帧的格式示意图；
图13示出本申请实施例提供的一种背光驱动方法的流程示意图。
具体实施方式
本申请实施例描述的架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
液晶显示设备主要由背光模组和液晶显示面板构成。液晶显示面板本身不发光，需要依靠背光模组提供的光源实现亮度显示。
液晶显示设备的显像原理，是将液晶置于两片导电玻璃之间，靠两个电极间电场的驱动，引起液晶分子扭曲的电场效应，以控制背光源透射或遮蔽功能，从而将影像显示出来。若加上彩色滤光片，则可显示彩色影像。
背光分区调节技术，是一种将背光源划分为多个区域(即分区)，对背光源不同区域分别进行背光调整的技术。这种技术根据背光源的分区对应的图像对背光源的亮度进行调整，这种技术在很大程度上提高了液晶显示的质量，而且在一般情况下，分区越多，其显示效果就越好。但是随着分区的增多，背光源部分的控制也相应地变得复杂。
背光源通常分为很多个背光分区，比如几百个背光分区甚至上千个背光分区，每个分 区需要单独控制其亮度，当分区数量较多时，导致连接光源的线缆太多。不同的背光分区的LED灯需要不同的背光驱动器单独控制其背光亮度，导致连接背光驱动器和LED灯的线缆过多，造成连接线缆的复杂交错。
同时，相关技术中图像显示设备通常设置有多个背光数据处理模块，如图1所示的图像显示设备，包括多个与图像显示装置连接的MCU(Micro Control Unit，微控制单元)，MCU1～MCUn，每个MCU为一个背光数据处理模块，每个MCU均由DC/DC电源供电。每个MCU连接部分背光驱动器，每个MCU接收图像显示装置发送背光分区对应的背光信息，分别生成背光驱动数据发送给背光分区对应的背光驱动器，背光驱动器根据MCU发送的背光驱动数据驱动对应的背光分区。由于每个MCU分别将背光驱动数据传输至与其连接的背光驱动器，会导致背光驱动数据传输至各个背光驱动器的时间不同步，进而导致各个背光分区的亮度变化不一致，各个背光分区的亮度变化与显示面板显示的画面图像的内容变化不对应，从而影响画面图像的显示效果。
基于以上问题，本申请实施例提供了一种背光驱动装置、图像显示设备和背光驱动方法。
本申请中的图像显示设备10可以是电视机、电脑或其他电子设备，下文以电视机为例进行说明，如图2所示的液晶电视机，液晶电视机包括显示面板500。
图像显示设备10的背光控制原理框图如图3所示，该图像显示设备包括图像处理装置100，背光驱动装置200，时序控制器300、背光源400和显示面板500。
图像处理装置100接收待显示的影像信号，即电视信号，对影像信号进行图像处理之后，向时序控制器300输出影像数据，并向背光驱动装置200输出全局亮度信息和分区亮度信息来驱动背光源400实现背光亮度控制。
其中，全局亮度信息可以是图像处理装置100根据待显示的影像数据确定的，也可以是由用户设定的，如用户可以通过遥控器调整液晶电视机10的背光亮度。全局亮度信息通常为PWM(Pulse Width Modulation，脉冲宽度调制)信号。在一些实施例中，图像处理装置100可以通过PWM信号线将全局亮度信息传输至背光驱动装置200；在另一些实施例中，图像处理装置100可以通过I 2C总线将全局亮度信息传输至背光驱动装置200。
分区亮度信息是图像处理装置100根据待显示的影像数据，按照背光源的分区情况确定的，可以通过SPI(Service Provider Interface，服务提供接口)总线传输，SPI总线属于串行总线的一种。
也可以说，图像处理装置100对影像信号进行图像处理之后，生成两部分信息：一部分为影像数据，影像数据传输至时序控制器300，由时序控制器300基于影像数据控制显示面板500显示对应的电视画面图像；另一部分为背光亮度信息，包括全局亮度信息和分区亮度信息，背光亮度信息传输至背光驱动装置200，由背光驱动装置200基于背光亮度 信息驱动背光源400为显示面板500提供背光。背光源400可以采用LED灯作为光源。
图像处理装置100基于相同的同步信号分别向时序控制器300传输影像数据，以及向背光驱动装置200传输分区亮度信息。同时，将同步信号传送至时序控制器300和背光驱动装置200，以使时序控制器300基于同步信号控制显示面板500显示画面图像，并使背光驱动装置200基于相同的同步信号驱动背光源。从而可以保证背光亮度变化与显示面板显示的画面图像的内容变化一致，提高图像显示设备的显示效果。
在一些实施例中，背光驱动装置200的内部结构可以如图4所示，该背光驱动装置200包括一个背光数据处理模块210和多个背光驱动器221，每个背光驱动器221对应驱动图3中的背光源400的一个背光分区。多个背光驱动器221被分为多个背光驱动器组，每个背光驱动器组包括至少一个背光驱动器，每个背光驱动器组通过一路串行总线与背光数据处理模块210连接。在图4所示的背光驱动装置200中，每个背光驱动器组都包括串行连接的多个背光驱动器221。在另外的实施例中，部分背光驱动器组可以只包括一个背光驱动器221，或者，每个背光驱动器组都可以只包括一个背光驱动器221。
本申请实施例设置有至少一个背光驱动器组，每个背光驱动器组包括多个背光驱动器，每个背光驱动器组通过一路串行总线与背光数据处理模块连接，而不需要每个背光驱动器分别通过线缆与背光数据处理模块连接，因此，可以大量减少背光驱动***中连接线缆的数量，有效降低背光驱动***的复杂度。
背光数据处理模块210可以根据图3中的图像处理装置100传输的全局亮度信息和分区亮度信息，基于背光驱动器与背光源的背光分区的对应关系，确定每个背光驱动器221对应的背光驱动数据。背光驱动器221也可以称为PWM驱动器。背光数据处理模块210基于图像处理装置100传输的同步信号，分别通过每路串行总线向对应的背光驱动器组发送该背光驱动器组中的背光驱动器对应的背光驱动数据，并将同步信号传输至每个背光驱动器组。从而可以保证各个背光驱动器221接收到相应的背光驱动数据的时间基本同步。背光驱动器221根据接收到的背光驱动数据驱动对应的背光分区，可以保证各个背光分区的亮度变化一致。
该背光驱动装置设置有多个背光驱动器，每个背光驱动器对应驱动背光源的至少一个背光分区，多个背光驱动器被划分至多个背光驱动器组，每个背光驱动器组通过一路串行总线与背光数据处理模块连接。背光数据处理模块接收图像处理装置根据待显示的影像数据确定的分区亮度信息，背光数据处理模块可以根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据，并基于图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组，发送该背光驱动器组中的背光驱动器对应的背光驱动数据，可以保证各个背光驱动器接收到相应的背光驱动数据的时间同步。背光驱动器根据接收到的背光驱动数据驱动对应的背光分区，可以保证各个背光分区的亮度变化基本 同步。同时，图像处理装置基于该同步信号控制显示面板根据影像数据显示画面图像，从而可以保证各个背光分区的亮度变化与显示面板显示的画面图像的内容变化相对应，提高图像显示设备的显示效果。
在另一些实施例中，背光驱动装置200的内部结构如图5所示，属于同一个背光驱动器组的背光驱动器安装在同一块灯驱一体板220上，属于不同背光驱动器组的背光驱动器安装在不同的灯驱一体板220上。灯驱一体板220也就是用于安装背光源的灯板。背光数据处理模块210将每个背光驱动器组中的背光驱动器对应的背光驱动数据通过串行总线传输至该背光驱动器组中的每个背光驱动器，并将同步信号分别通过同步信号线传送至该背光驱动器组中的每个背光驱动器。
与相关技术中背光驱动器需要通过连接线缆与其对应驱动的背光分区的LED灯连接相比，本申请实施例中的每个背光驱动器均设置在其驱动的背光分区对应的灯板上，不需要再通过连接线缆与LED灯连接，大量减少了背光驱动***中连接线缆的数量，能够有效降低背光驱动***的复杂度。
具体地，安装在每个灯驱一体板上的背光驱动器可以通过图6所示的串行总线连接端口连接到串行总线上，并通过串行总线与背光数据处理模块210连接。如图6所示，每个背光驱动器221均包含SDI引脚和SDO引脚，即数据输入引脚和数据输出引脚。第一个背光驱动器221的SDI引脚与串行总线连接端口的SDI端口连接，每个背光驱动器的SDO引脚与下一个背光驱动器的SDI引脚连接，最后一个背光驱动器的SDO引脚与串行总线连接端口的SDO端口连接，从而可以完成数据的闭环传输。
并且，每个背光驱动器221均连接串行总线连接端口的VSYNC端口，用于接收同步信号，每个背光驱动器221均设置有IC引脚，分别连接串行总线连接端口的SCK端口，用于同步时钟信号。
在某些实施例中，背光数据处理模块210的内容结构如图7所示，包括缓存单元212、数据计算单元213和数据分发单元214，还可以包括SPI通讯单元211和SPI收发单元215。
其中，SPI通讯单元211用于通过SPI总线接收图像处理装置100传输的分区亮度信息，并将接收到的分区亮度信息缓存至缓存单元212。在其他实施例中，也可以采用其他类型的总线通讯单元替代SPI通讯单元211，用于接收分区亮度信息。缓存单元212可以采用RAM存储器缓存分区亮度信息。数据计算单元213用于从缓存单元212获取所述分区亮度信息，并根据所述分区亮度信息和图像处理装置100传输的全局亮度信息，确定每个背光驱动器对应的背光驱动数据，将所确定的背光驱动数据均传输至数据分发单元214。数据分发单元214用于将每个背光驱动数据分发至对应的串行总线的总线接口，即分发至对应的SPI收发单元215，每个SPI收发单元215将接收到的背光驱动数据通过串行总线传输至安装在对应的灯驱一体板上的背光驱动器221中。在其他的实施例中，串行总线的 总线接口也可以是其他类型的收发单元。
本申请实施例提供了一种一对多的串行总线分配方式，可以基于同步信号将背光驱动数据从一个背光数据处理模块分别通过多路串行总线分发至多个灯驱一体板。为了使发送背光驱动数据的时刻能够与同步信号更吻合，设置了缓存单元212，基于RAM缓存的流水线式数据分配方式，在一个数据传输帧内，将SPI通讯单元211接收到的串行总线数据，通过RAM缓存，实时将数据分发到多路SPI收发单元215。
本申请实施例的背光数据处理模块210根据全局亮度信息和分区亮度信息完成所有背光数据的统计、增益计算和分区位置映射，并且以预设的数据格式按照同步方式通过串行总线分发给多个背光驱动器组，每个背光驱动器组具体可以是灯驱一体板220。发送给每个灯驱一体板220的串行数据中，可以包含驱动器地址(DevAddr)、寄存器地址(RegAddr)、数据长度(Length)和数据(Data1-DataN)。其中，数据(Data1-DataN)为背光驱动数据，可以包括PWM占空比数据和背光电流幅值。背光数据处理模块210通过此数据格式将PWM占空比数据和背光电流幅值输送给对应的背光驱动器，而背光驱动器可以根据同步信号、PWM占空比数据和背光电流幅值生成多路PWM控制信号输送给背光源中对应的背光分区进行亮度控制。
具体地，串行总线的总线接口可以按照图8所示的时序发送数据：在每个同步信号SYNC的上升沿，使能信号DEN上升为高电平，数据传输使能，开始传输数据帧。数据帧中包括N个RAM缓存对应的背光驱动数据，依次轮流传输每个RAM缓存对应的背光驱动数据。当该数据帧全部传输完成后，使能信号DEN下降为低电平，结束数据传输，等待下一个同步信号SYNC，再上升为高电平。
也就是说，每路串行总线的总线接口均按照如下方式发送背光驱动数据：响应于一个同步信号，通过串行总线发送一个数据帧。所述数据帧包括顺次排列的驱动数据，所述驱动数据为与串行总线连接的背光驱动器组中的每个背光驱动器对应的背光驱动数据。在一些实施例中，如图9所示，在一个同步信号SYNC与下一个同步信号SYNC之间，传输一个数据帧，该数据帧包括Data1～DataN共N个背光驱动数据，对应N个背光分区的背光驱动数据。在一种实施例中，每个数据帧可以包括Data1～DataM*N共M行*N列的背光分区的背光驱动数据。
在另一些实施例中，为了保通讯数据的完整性和准确性，上述数据帧还可以包括校验数据，所述校验数据为该数据帧中所有驱动数据的校验和。校验数据在数据帧的位置可以是头部或尾部。示例性地，图10示出了一种具有校验机制的串行总线的驱动数据的数据帧格式，在背光驱动数据Data1～DataN之外，在数据帧中还增加有位于背光驱动数据Data1之前的SOH(Start Of Heading，帧数据头)，位于SOH之后的CMD(Command，命令字)，以及位于背光驱动数据DataN之后的EOF(End Of Frame，帧数据尾)。其中，EOF可以 是预设的固定数，或者是当前帧所有数据的校验和，以此实现帧校验，保证通讯的数据完整性。通常，在背光数据处理模块和背光驱动器之间只需要单方向传递数据，所以串行总线可以使用2根信号线完成，即数据线SDI和时钟信号线SCK，具体如图11所示。
在一种可选的实施例中，每个数据帧中还可以包含背光驱动器组中的背光驱动器的驱动器地址、寄存器地址和数据长度。如图12所示，一个数据帧中包含驱动器地址(DevAddr)、寄存器地址(RegAddr)、数据长度(Length)和数据(Data1-DataN)。其中，数据(Data1-DataN)为N个背光驱动器对应的背光驱动数据，可以包括PWM占空比数据和背光电流幅值。每个背光驱动器组根据接收到的数据帧中的驱动器地址和寄存器地址，将每个背光驱动器对应的背光驱动数据写入对应的寄存器中，每个背光驱动器根据对应寄存器中的背光驱动数据生成驱动信号驱动相应的背光分区。
与上述背光驱动装置基于相同的发明构思，申请实施例还提供了一种图像显示设备，如图3所示，该图像显示设备可以包括图像处理装置100，背光驱动装置200，时序控制器300、背光源400和显示面板500。其中，背光驱动装置200可以采用上述实施例提供的背光驱动装置。图像处理装置100用于根据待显示的影像数据向背光驱动装置200传输分区亮度信息，并向背光驱动装置200传输同步信号，以及基于同步信号控制显示面板500根据所述影像数据进行显示。背光驱动装置200用于基于所述同步信号，驱动背光源400为显示面板500提供背光。背光源400可以采用LED灯作为光源，背光源400具有多个背光分区。
本申请实施例提供的图像显示设备，设置有多个背光驱动器，每个背光驱动器对应驱动背光源的至少一个背光分区，多个背光驱动器被划分至多个背光驱动器组，每个背光驱动器组通过一路串行总线与背光数据处理模块连接。背光数据处理模块接收图像处理装置根据待显示的影像数据确定的分区亮度信息，背光数据处理模块可以根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据，并基于图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组，发送该背光驱动器组中的背光驱动器对应的背光驱动数据，可以保证各个背光驱动器接收到相应的背光驱动数据的时间同步。背光驱动器根据接收到的背光驱动数据驱动对应的背光分区，可以保证各个背光分区的亮度变化一致。同时，图像处理装置基于该同步信号控制显示面板根据影像数据显示画面图像，从而可以保证各个背光分区的亮度变化与显示面板显示的画面图像的内容变化相对应，提高图像显示设备的显示效果。
与上述背光驱动装置基于相同的发明构思，申请实施例还提供了一种背光驱动方法，如图13所示，该方法包括：
步骤S1301，背光数据处理模块根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据。
其中，每个背光驱动器用于根据对应的背光驱动数据驱动背光源的至少一个背光分区；所述分区亮度信息是所述图像处理装置根据待显示的影像数据确定的。
步骤S1302，背光数据处理模块基于所述图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组发送该背光驱动器组中的背光驱动器对应的背光驱动数据。
其中，每个背光驱动器组包括至少一个背光驱动器；所述同步信号为所述图像处理装置用来控制显示面板基于所述影像数据进行显示的同步信号。
具体地，针对每路串行总线，响应于一个同步信号，可以通过所述串行总线发送一个数据帧；所述数据帧包括顺次排列的驱动数据，所述驱动数据为所述串行总线连接的背光驱动器组中的每个背光驱动器对应的背光驱动数据。
本领域内的技术人员应明白，本申请的实施例可提供为方法、装置、设备、***或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (11)

  1. 一种背光驱动装置，其特征在于，包括：背光数据处理模块和至少一个背光驱动器组，每个背光驱动器组通过一路串行总线与所述背光数据处理模块连接；每个背光驱动器组包括至少一个背光驱动器，每个背光驱动器对应驱动背光源的至少一个背光分区；
    所述背光数据处理模块用于根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据，并分别通过每路串行总线向对应的背光驱动器组发送该背光驱动器组中的背光驱动器对应的背光驱动数据；所述分区亮度信息是所述图像处理装置根据待显示的影像数据确定的。
  2. 根据权利要求1所述的背光驱动装置，其特征在于，所述背光数据处理模块基于所述图像处理装置传输的同步信号，分别通过每路串行总线向对应的背光驱动器组发送背光驱动数据；所述同步信号为所述图像处理装置用来控制显示面板基于所述影像数据进行显示的同步信号。
  3. 根据权利要求2所述的背光驱动装置，其特征在于，所述背光数据处理模块包括缓存单元、数据计算单元和数据分发单元；
    所述缓存单元用于缓存图像处理装置传输的分区亮度信息；
    所述数据计算单元用于从所述缓存单元获取所述分区亮度信息，并根据所述分区亮度信息，确定每个背光驱动器对应的背光驱动数据；
    所述数据分发单元用于基于所述同步信号将每个背光驱动数据分发至对应的串行总线的总线接口。
  4. 根据权利要求3所述的背光驱动装置，其特征在于，每路串行总线的总线接口均按照如下方式发送背光驱动数据：
    响应于一个同步信号，通过所述串行总线向对应的背光驱动器组发送一个数据帧；所述数据帧包括顺次排列的驱动数据，所述驱动数据为所述串行总线连接的背光驱动器组中的每个背光驱动器对应的背光驱动数据。
  5. 根据权利要求4所述的背光驱动装置，其特征在于，所述数据帧还包括校验数据，所述校验数据为所述数据帧中所有驱动数据的校验和，所述校验数据位于所述数据帧的头部或尾部。
  6. 根据权利要求4所述的背光驱动装置，其特征在于，每个数据帧中还包含背光驱动器组中的背光驱动器的驱动器地址、寄存器地址和数据长度；每个背光驱动器组根据接收到的数据帧中的驱动器地址和寄存器地址，将每个背光驱动器对应的背光驱动数据写入对应的寄存器中，每个背光驱动器根据对应寄存器中的背光驱动数据生成驱动信号驱动相应的背光分区。
  7. 根据权利要求6所述的背光驱动装置，其特征在于，每个背光驱动器对应的背光驱动数据包括背光电流幅值和PWM占空比数据。
  8. 根据权利要求1～7中任一项所述的背光驱动装置，其特征在于，每个所述背光驱动器组中的多个背光驱动器串行连接；所述背光驱动器设置在用于安装所述背光源的背光板上。
  9. 一种图像显示设备，其特征在于，包括图像处理装置、背光驱动装置、显示面板和背光源；所述背光驱动装置采用权利要求1～8任一项所述的背光驱动装置；
    所述图像处理装置用于根据待显示的影像数据向所述背光驱动装置传输分区亮度信息，以及控制所述显示面板根据所述影像数据进行显示；
    所述背光驱动装置用于驱动所述背光源为所述显示面板提供背光，所述背光源具有多个背光分区。
  10. 一种背光驱动方法，其特征在于，包括：
    根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据；其中，每个背光驱动器用于根据对应的背光驱动数据驱动背光源的至少一个背光分区；所述分区亮度信息是所述图像处理装置根据待显示的影像数据确定的；
    分别通过每路串行总线向对应的背光驱动器组发送该背光驱动器组中的背光驱动器对应的背光驱动数据；其中，每个背光驱动器组包括多个背光驱动器。
  11. 一种图像显示设备，其特征在于，所述图像显示设备包括：图像处理装置、背光数据处理模块、灯驱一体板和显示面板；
    所述图像处理装置用于根据待显示的影像数据向所述背光数据处理模块传输分区亮度信息，以及控制所述显示面板根据所述影像数据进行显示；
    所述灯驱一体板上设置有背光源和至少一个背光驱动器，所述背光源包括至少一个背光分区；
    所述背光数据处理模块用于根据图像处理装置传输的分区亮度信息，确定每个背光驱动器对应的背光驱动数据，所述背光数据处理模块通过串行总线向所述灯驱一体板上的背光驱动器发送对应的背光驱动数据。
PCT/CN2022/088539 2021-04-22 2022-04-22 背光驱动装置、图像显示设备和背光驱动方法 WO2022223030A1 (zh)

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