CN115240604A - Backlight driving device, image display apparatus, and backlight driving method - Google Patents
Backlight driving device, image display apparatus, and backlight driving method Download PDFInfo
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- 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
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- G—PHYSICS
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- 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
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Abstract
The application provides a backlight driving device, an image display device and a backlight driving method, and belongs to the technical field of display. The backlight driving device is provided with at least one backlight driver group, each backlight driver group comprises a plurality of backlight drivers, each backlight driver group is connected with the backlight data processing module through one path of serial bus, and each backlight driver is not required to be connected with the backlight data processing module through cables, so that the number of connecting cables in the backlight driving system can be greatly reduced, and the complexity of the backlight driving system is effectively reduced.
Description
The present application claims priority of chinese patent application entitled "backlight driving device, image display apparatus, and backlight driving method" filed by the intellectual property office of the people's republic of china, application number 202110437795.2, at 22/4/2021, the entire contents of which are incorporated herein by reference.
Technical Field
The present application relates to the field of display technologies, and in particular, to a backlight driving apparatus, an image display device, and a backlight driving method.
Background
Currently, with the development of display technologies, image display apparatuses have been widely used in various industries. For example, liquid crystal displays are used in televisions for displaying picture images. An image display apparatus is generally provided with a display panel for displaying a picture image based on received image data and a backlight for providing a backlight for the display panel under the drive 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, and the LED lamps of different backlight partitions need different backlight drivers to control their backlight brightness independently, so that too many cables for connecting the backlight drivers and the LED lamps are needed, and complicated interleaving of connecting cables is caused.
Disclosure of Invention
In order to solve the existing technical problem, embodiments of the present application provide a backlight driving device, an image display apparatus, and a backlight driving method, which can improve a display effect of the image display apparatus.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a backlight driving apparatus, including: the backlight driver group is connected with the backlight data processing module through a serial bus; each backlight driver set comprises a plurality of backlight drivers, and each backlight driver corresponds to at least one backlight partition for driving the backlight source;
the backlight data processing module is used for determining backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device and respectively sending the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus; the partition brightness information is determined by the image processing device according to image data to be displayed.
The backlight driver group is connected with the backlight data processing module through one path of serial bus, and each backlight driver is not required to be connected with the backlight data processing module through cables respectively.
In an optional embodiment, the backlight data processing module sends backlight driving data to the corresponding backlight driver group through each serial bus respectively based on a synchronization signal transmitted by the image processing device; the synchronous signal is used for controlling a display panel to display based on the image data by the image processing device.
In an optional embodiment, the backlight data processing module includes a buffer unit, a data calculating unit and a data distributing unit;
the cache unit is used for caching the partition brightness information transmitted by the image processing device;
the data calculation unit is used for acquiring the partition brightness information from the cache unit and determining backlight driving 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 a bus interface of a corresponding serial bus based on the synchronous signal.
In the above embodiment, the partition brightness information transmitted by the image processing apparatus is firstly 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 enabling the time of sending the backlight driving data to be more consistent with the synchronization signal.
In an alternative embodiment, the bus interface of each serial bus transmits the backlight driving data as follows:
transmitting a data frame to the corresponding backlight driver group through the serial bus in response to a synchronization signal; the data frame comprises driving data which are sequentially arranged, wherein the driving data are backlight driving data corresponding to each backlight driver in the backlight driver group connected with the serial bus.
In an optional embodiment, the data frame further includes check data, where the check data is a checksum of all driving data in the data frame, and the check data is located at a head or a tail of the data frame.
In the above embodiment, the checksum of all the driving data is added to the data frame as the verification data, so that frame verification can be realized, and the integrity and accuracy of the transmitted backlight driving data can be ensured.
In an alternative embodiment, each data frame further includes a driver address, a register address and a data length of the backlight driver in the backlight driver group; and each backlight driver group writes backlight driving data corresponding to each backlight driver into a corresponding register according to a driver address and a register address in the received data frame, and each backlight driver generates a driving signal according to the backlight driving data in the corresponding register to drive a corresponding backlight partition.
In the above embodiment, the data frame includes the driver address and the register address of the backlight driver, so that each backlight driving data can be accurately sent to the corresponding backlight driver and stored in the corresponding register.
In an alternative embodiment, the backlight driving data for each backlight driver includes backlight current amplitude and PWM duty cycle data.
In an alternative embodiment, the plurality of backlight drivers in each of the backlight driver groups are connected in series; the backlight driver is disposed on a backlight panel for mounting the backlight source.
In the above embodiment, each backlight driver is installed on the backlight plate of the backlight source, and is not required to be connected with the backlight source through a connection cable, so that the number of connection cables in the backlight driving system is greatly reduced, and the complexity of the backlight driving system can be effectively reduced.
In a second aspect, an embodiment of the present application provides an image display apparatus, including an image processing device, a backlight driving device, a display panel, and a backlight source, which are connected in sequence; the backlight driving device adopts the backlight driving device of the first aspect;
the image processing device is used for transmitting the partition brightness information to the backlight driving device according to the image data to be displayed and controlling the display panel to display according to the image data;
the backlight driving device is used for driving the backlight source to provide backlight for the display panel, and the backlight source is provided with a plurality of backlight subareas.
In a third aspect, an embodiment of the present application provides a backlight driving method, which is performed by a backlight driving apparatus, and includes:
determining backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device; wherein each backlight driver is configured to drive at least one backlight partition of the backlight source according to corresponding backlight drive data; the partition brightness information is determined by the image processing device according to image data to be displayed;
respectively sending backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus; wherein each backlight driver group comprises a plurality of backlight drivers; the synchronous signal is used for controlling a display panel to display based on the image data by the image processing device.
In an alternative embodiment, the bus interface of each serial bus transmits the backlight driving data as follows:
transmitting a data frame to the corresponding backlight driver group through the serial bus in response to a synchronization signal; the data frame comprises driving data which are sequentially arranged, wherein the driving data are backlight driving data corresponding to each backlight driver in the backlight driver group connected with the serial bus.
In an optional embodiment, the data frame further includes check data, where the check data is a checksum of all driving data in the data frame, and the check data is located at a head or a tail of the data frame.
The backlight driver group comprises a plurality of backlight driver groups, wherein each backlight driver group is connected with a backlight data processing module through a serial bus. The backlight data processing module receives the partition brightness information determined by the image processing device according to the image data to be displayed, the backlight data processing module can determine the backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device, and respectively sends the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus based on the synchronization signal transmitted by the image processing device, so that the time synchronization of each backlight driver receiving the corresponding backlight driving data can be ensured. The backlight driver drives the corresponding backlight subareas according to the received backlight driving data, so that the brightness change of each backlight subarea can be ensured to be consistent. Meanwhile, the image processing device controls the display panel to display the picture image according to the image data based on the synchronous signal, so that the brightness change of each backlight partition can be ensured to correspond to the content change of the picture image displayed by the display panel, and the display effect of the image display equipment is improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic view showing a structure of an image display apparatus of the related art;
fig. 2 shows a schematic diagram of a liquid crystal television provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an image display device provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram illustrating a backlight driving apparatus provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram illustrating another backlight driving apparatus provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram illustrating a lamp driver integrated board according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a backlight data processing module according to an embodiment of the present application;
FIG. 8 is a timing diagram illustrating a method for transmitting data over a serial bus according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram illustrating a format of a serially transmitted data frame according to an embodiment of the present application;
fig. 10 is a schematic diagram illustrating a format of another serially transmitted data frame according to an embodiment of the present application;
FIG. 11 is a schematic diagram illustrating a serial bus for data transmission according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram illustrating a format of another serially transmitted data frame provided in an embodiment of the present application;
fig. 13 is a flowchart illustrating a backlight driving method according to an embodiment of the present application.
Detailed Description
The architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that with the occurrence of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
At present, image display devices are widely used in electronic products such as televisions, computers, mobile phones, and the like. An existing image display device is generally provided with a plurality of backlight data processing modules, such as the image display device shown in fig. 1, which includes a plurality of MCUs (Micro Control units) connected to an image display device, and MCUs 1 to MCUn, where each MCU is a backlight data processing module and each MCU is powered by a DC/DC power supply. Each MCU is connected with a partial backlight driver, each MCU receives backlight information corresponding to the backlight partition sent by the image display device, respectively generates backlight driving data and sends the backlight driving data to the backlight driver corresponding to the backlight partition, and the backlight driver drives the corresponding backlight partition according to the backlight driving data sent by the MCU. Since each MCU respectively transmits the backlight driving data to the backlight driver connected thereto, the time for transmitting the backlight driving data to each backlight driver is asynchronous, and thus the luminance change of each backlight partition is inconsistent, and the luminance change of each backlight partition does not correspond to the content change of the picture image displayed by the display panel, thereby affecting the display effect of the picture image.
In order to solve the above problem, an embodiment of the present application provides a backlight driving apparatus, where the backlight driving apparatus 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 is connected to a backlight data processing module through a serial bus. The backlight data processing module receives the partition brightness information determined by the image processing device according to the image data to be displayed, the backlight data processing module can determine the backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device, and respectively sends the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus based on the synchronization signal transmitted by the image processing device, so that the time synchronization of each backlight driver receiving the corresponding backlight driving data can be ensured. The backlight driver drives the corresponding backlight subareas according to the received backlight driving data, so that the brightness change of each backlight subarea can be ensured to be basically synchronous. Meanwhile, the image processing device controls the display panel to display the picture image according to the image data based on the synchronous signal, so that the brightness change of each backlight partition can be ensured to correspond to the content change of the picture image displayed by the display panel, and the display effect of the image display equipment is improved.
And the backlight driver drives the corresponding backlight subarea according to the backlight brightness data sent by the backlight data processing module. In the prior art, a plurality of backlight data processing modules are usually provided, and each backlight data processing module is connected with part of the backlight driver. Each backlight data processing module respectively transmits backlight driving data to the backlight driver connected with the backlight data processing module, so that the time for transmitting the backlight driving data to each backlight driver is asynchronous, the brightness change of each backlight partition is inconsistent, the brightness change of each backlight partition does not correspond to the content change of the picture image displayed by the display panel, and the display effect of the picture image is influenced.
The backlight driving apparatus provided in the embodiment of the present application may be applied to an image display device, which may be a television, a computer, or other electronic devices, and will be described below with reference to a television as an example, such as the liquid crystal television 10 shown in fig. 2. The image display apparatus is configured as shown in fig. 3, and includes an image processing device 100, a backlight driving device 200, a timing controller 300, a backlight 400, and a display panel 500.
The image processing apparatus 100 receives a video signal to be displayed, i.e., a television signal, performs image processing on the video signal, outputs video data to the timing controller 300, and outputs global brightness information and partition brightness information to the backlight driving apparatus 200 to drive the backlight 400 to realize 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 a user, for example, the user may adjust the backlight brightness of the lcd tv 10 through a remote controller. The global luminance information is typically a PWM (Pulse Width Modulation) signal. In some embodiments, the image processing apparatus 100 may transmit the global luminance information to the backlight driving apparatus 200 through the PWM signal line; in other embodiments, the image processing apparatus 100 may pass through I 2 The C bus transmits the global luminance information to the backlight driving device 200.
The partition luminance information is determined by the image processing apparatus 100 according to the video data to be displayed and the partition condition of the backlight, and may be transmitted through an SPI (Service Provider Interface) bus, which is one of serial buses.
The image processing apparatus 100 may also generate two pieces of information after performing image processing on the video signal: a part of the image data is transmitted to the timing controller 300, and the timing controller 300 controls the display panel 500 to display a corresponding tv picture image based on the image data; 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 400 to provide backlight for the display panel 500 based on the backlight brightness information. The backlight 400 may employ LED lamps as light sources.
The image processing apparatus 100 transmits the image data to the timing controller 300 and the divisional luminance information to the backlight driving apparatus 200, respectively, based on the same synchronization signal. Meanwhile, the sync signal is transmitted to the timing controller 300 and the backlight driving device 200, so that the timing controller 300 controls the display panel 500 to display the picture image based on the sync signal, and the backlight driving device 200 drives the backlight based on the same sync signal. Therefore, the backlight brightness change can be consistent with the content change of the picture image displayed by the display panel, and the display effect of the image display equipment is improved.
In some embodiments, the internal structure of the backlight driving apparatus 200 may be as shown in fig. 4, where the backlight driving apparatus 200 includes a backlight data processing module 210 and a plurality of backlight drivers 221, and each backlight driver 221 corresponds to a backlight partition for driving the backlight source 400 in fig. 3. The backlight drivers 221 are divided into one or more 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. In the backlight driving apparatus 200 shown in fig. 4, each backlight driver group includes a plurality of backlight drivers 221 connected in series. In further embodiments, some of the backlight driver groups may comprise only one backlight driver 221, or each backlight driver group may comprise only one backlight driver 221.
The backlight data processing module 210 may determine the backlight driving data corresponding to each backlight driver 221 based on the correspondence relationship between the backlight driver and the backlight partition of the backlight source according to the global luminance information and the partition luminance 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 sends the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each serial bus respectively based on the synchronization signal transmitted by the image processing apparatus 100, and transmits the synchronization signal to each backlight driver group. So that it is possible to ensure that the times at which the respective backlight drivers 221 receive the corresponding backlight driving data are substantially synchronized. The backlight driver 221 drives the corresponding backlight partition according to the received backlight driving data, so that the brightness change of each backlight partition can be ensured to be consistent.
In other embodiments, the internal structure of the backlight driving apparatus 200 may be as shown in fig. 5, the backlight drivers belonging to the same backlight driver group are mounted on the same lamp driving integrated board 220, and the backlight drivers belonging to different backlight driver groups are mounted on different lamp driving integrated boards 220. The lamp driving body 220 is also a backlight panel for mounting a backlight. The backlight data processing module 210 transmits the backlight driving data corresponding to the backlight driver in each backlight driver group to each backlight driver in the backlight driver group through a serial bus, and transmits the synchronization signal to each backlight driver in the backlight driver group through a synchronization signal line.
Compared with the prior art in which the backlight driver needs to be connected with the LED lamps of the corresponding driving backlight partitions through the connecting cables, each backlight driver in the embodiment of the application is arranged on the backlight plate corresponding to the driving backlight partitions, and does not need to be connected with the LED lamps through the connecting cables, so that the number of the connecting cables in the backlight driving system is greatly reduced, and the complexity of the backlight driving system can be effectively reduced.
Specifically, the backlight driver mounted on each lamp driving body board may be connected to the serial bus through the serial bus connection port shown in fig. 6, and connected to the backlight data processing module 210 through the serial bus. As shown in fig. 6, each of the backlight drivers 221 includes an SDI pin and an SDO pin, i.e., a data input pin and a data output pin. The SDI pin of the first backlight driver 221 is connected to the SDI port of the serial bus connection port, the SDO pin of each backlight driver is connected to the SDI pin of the next backlight driver, and the SDO pin of the last backlight driver is connected to the SDO port of the serial bus connection port, so that closed-loop transmission of data can be completed.
Moreover, each backlight driver 221 is connected to the VSYNC port of the serial bus connection port for receiving a synchronization signal, and each backlight driver 221 is provided with an IC pin for respectively connecting to the SCK port of the serial bus connection port for synchronizing a clock signal.
In an alternative embodiment, the content structure of the backlight data processing module 210 is as shown in fig. 7, and includes a buffer unit 212, a data calculating unit 213, and a data distributing unit 214, and may further include an SPI communication unit 211 and an SPI transceiving unit 215.
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 to the buffer unit 212. In other embodiments, other types of bus communication units may be used instead of the SPI communication unit 211 for receiving the partition brightness information. The buffer unit 212 may buffer the partitioned luminance information using a RAM memory. The data calculating unit 213 is configured to obtain the partition brightness information from the buffer unit 212, determine backlight driving data corresponding to each backlight driver according to the partition brightness information and the global brightness information transmitted by the image processing apparatus 100, and transmit all the determined backlight driving data to the data distributing unit 214. The data distribution unit 214 is configured to distribute each backlight driving data to a bus interface of a corresponding serial bus, that is, to a corresponding SPI transceiving unit 215, and each SPI transceiving unit 215 transmits the received backlight driving data to the backlight driver 221 installed on the corresponding lamp driving integrated board through the serial bus. In other embodiments, the bus interface of the serial bus may be other types of transceiving units.
The embodiment of the application provides a one-to-many serial bus distribution mode, which can distribute backlight driving data from one backlight data processing module to a plurality of lamp driving integrated boards through a plurality of paths of serial buses respectively based on a synchronous signal. In order to make the time of sending the backlight driving data more consistent with the synchronous signal, a buffer unit 212 is provided, and serial bus data received by the SPI communication unit 211 is distributed to the multiple SPI transceiving units 215 in real time through RAM buffering in one data transmission frame based on a pipelined data distribution manner of RAM buffering.
The backlight data processing module 210 according to the embodiment of the present application completes 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 result to a plurality of backlight driver groups in a preset data format in a synchronous manner through a serial bus, where each backlight driver group may specifically be a lamp driver integrated board 220. The serial Data transmitted to each lamp driver integrated board 220 may include a driver address (DevAddr), a register address (RegAddr), a Data Length (Length), and Data (Data 1-DataN). The Data (Data 1-DataN) are backlight driving Data, and may include PWM duty Data and backlight current amplitude. The backlight data processing module 210 transmits the PWM duty ratio data and the backlight current amplitude to the corresponding backlight driver through the data format, and the backlight driver may generate a plurality of PWM control signals according to the synchronization signal, the PWM duty ratio data and the backlight current amplitude and transmit the PWM control signals to the corresponding backlight partition in the backlight source for brightness control.
Specifically, the bus interface of the serial bus may transmit data according to the timing shown in fig. 8: at the rising edge of each synchronization signal SYNC, the enable signal DEN rises to a high level, data transmission is enabled, and transmission of a data frame begins. The data frame comprises backlight driving data corresponding to N RAM caches, and the backlight driving data corresponding to each RAM cache is transmitted in turn. When the data frame is completely transmitted, the enable signal DEN is lowered to a low level, the data transmission is terminated, and the next synchronization signal SYNC is waited for and then raised to a high level.
That is, the bus interface of each serial bus transmits the backlight driving data as follows: a data frame is transmitted over the serial bus in response to a synchronization signal. The data frame includes driving data arranged in sequence, the driving data being backlight driving data corresponding to each backlight driver in a group of backlight drivers connected to the serial bus. In some embodiments, as shown in fig. 9, one Data frame is transmitted between one synchronization signal SYNC and the next synchronization signal SYNC, where the Data frame includes N backlight driving Data, which correspond to N backlight partitions, of Data1 to DataN. In one embodiment, each Data frame may include backlight driving Data for the backlight partition of M rows by N columns of Data1 to DataM by N.
In other embodiments, in order to ensure the integrity and accuracy of the communication data, the data frame may further include check data, where the check data is a checksum of all the driving data in the data frame. The position of the check data in the data frame may be a header or a trailer. Exemplarily, fig. 10 shows a Data Frame format Of driving Data Of a serial bus having a verification mechanism, in which, in addition to the backlight driving Data1 to DataN, an SOH (Start Of header, frame Data header) positioned before the backlight driving Data1, a CMD (Command word) positioned after the SOH, and an EOF (End Of Frame Data) positioned after the backlight driving Data DataN are added to a Data Frame. The EOF can be a preset fixed number or a checksum of all data of the current frame, so that frame verification is realized, and the integrity of communication data is ensured. Generally, only one-way data transfer is required between the backlight data processing module and the backlight driver, so the serial bus can be completed by using 2 signal lines, i.e. the data line SDI and the clock signal line SCK, as shown in fig. 11.
In an alternative embodiment, each data frame may further include a driver address, a register address, and a data length of the backlight driver in the backlight driver group. As shown in fig. 12, one Data frame includes a driver address (DevAddr), a register address (RegAddr), a Data Length (Length), and Data (Data 1-DataN). The Data (Data 1-DataN) are backlight driving Data corresponding to the N backlight drivers, and may include PWM duty Data and backlight current amplitude. And each backlight driver group writes backlight driving data corresponding to each backlight driver into a corresponding register according to a driver address and a register address in the received data frame, and each backlight driver generates a driving signal according to the backlight driving data in the corresponding register to drive a corresponding backlight partition.
Based on the same inventive concept as the above-described backlight driving device, the application embodiments also provide an image display apparatus, which may include an image processing device 100, a backlight driving device 200, a timing controller 300, a backlight 400, and a display panel 500, as shown in fig. 3. The backlight driving device 200 may adopt the backlight driving device provided in the above embodiments. The image processing apparatus 100 is configured to transmit the partition brightness information to the backlight driving apparatus 200 according to the image data to be displayed, transmit the synchronization signal to the backlight driving apparatus 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 used for driving the backlight 400 to provide backlight for the display panel 500 based on the synchronization signal. The backlight 400 may employ LED lamps as light sources, and the backlight 400 has a plurality of backlight partitions.
The image display device provided by the embodiment of the application is provided with a plurality of backlight drivers, each backlight driver corresponds to at least one backlight partition for driving the backlight source, the backlight drivers are divided into a plurality of backlight driver groups, and each backlight driver group is connected with the backlight data processing module through one path of serial bus. The backlight data processing module receives the partition brightness information determined by the image processing device according to the image data to be displayed, the backlight data processing module can determine the backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device, and respectively sends the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus based on the synchronization signal transmitted by the image processing device, so that the time synchronization of each backlight driver receiving the corresponding backlight driving data can be ensured. The backlight driver drives the corresponding backlight subareas according to the received backlight driving data, so that the brightness change of each backlight subarea can be ensured to be consistent. Meanwhile, the image processing device controls the display panel to display the picture images according to the image data based on the synchronous signals, so that the brightness change of each backlight partition can be ensured to correspond to the content change of the picture images displayed by the display panel, and the display effect of the image display equipment is improved.
Based on the same inventive concept as the backlight driving apparatus described above, an application embodiment further provides a backlight driving method, as shown in fig. 13, the method including:
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 apparatus.
Wherein each backlight driver is configured to drive at least one backlight partition of the backlight source according to corresponding backlight drive data; the partition brightness information is determined by the image processing apparatus based on image data to be displayed.
In step S1302, the backlight data processing module sends the backlight driving data corresponding to the backlight driver 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 apparatus.
Wherein each backlight driver group comprises at least one backlight driver; the synchronous signal is used for controlling a display panel to display based on the image data by the image processing device.
Specifically, for each serial bus, one data frame may be transmitted over the serial bus in response to one synchronization signal; the data frame comprises driving data which are sequentially arranged, wherein the driving data are backlight driving data corresponding to each backlight driver in the backlight driver group connected with the serial bus.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus, device, 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, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A backlight driving apparatus, comprising: the backlight driver group is connected with the backlight data processing module through a serial bus; each backlight driver set comprises a plurality of backlight drivers, and each backlight driver corresponds to at least one backlight partition for driving the backlight source;
the backlight data processing module is used for determining backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device and respectively sending the backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus; the partition brightness information is determined by the image processing apparatus based on image data to be displayed.
2. The backlight driving apparatus according to claim 1, wherein the backlight data processing module respectively sends backlight driving data to the corresponding backlight driver set through each serial bus based on the synchronization signal transmitted by the image processing apparatus; the synchronous signal is used for controlling a display panel to display based on the image data by the image processing device.
3. The backlight driving device according to claim 2, wherein the backlight data processing module comprises a buffer unit, a data calculating unit and a data distributing unit;
the cache unit is used for caching the partition brightness information transmitted by the image processing device;
the data calculation unit is used for acquiring the partition brightness information from the cache unit and determining backlight driving 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 a bus interface of a corresponding serial bus based on the synchronous signal.
4. The backlight driving device according to claim 3, wherein the bus interface of each serial bus transmits the backlight driving data as follows:
transmitting a data frame to the corresponding backlight driver group through the serial bus in response to a synchronization signal; the data frame comprises driving data which are sequentially arranged, wherein the driving data are backlight driving data corresponding to each backlight driver in the backlight driver group connected with the serial bus.
5. The backlight driving device according to claim 4, wherein the data frame further comprises a check data, the check data is a checksum of all driving data in the data frame, and the check data is located at a head or a tail of the data frame.
6. The backlight driving device according to claim 4, wherein each data frame further comprises a driver address, a register address and a data length of the backlight driver in the backlight driver group; and each backlight driver group writes backlight driving data corresponding to each backlight driver into a corresponding register according to a driver address and a register address in the received data frame, and each backlight driver generates a driving signal according to the backlight driving data in the corresponding register to drive a corresponding backlight partition.
7. The backlight driving apparatus according to claim 6, wherein the backlight driving data corresponding to each backlight driver comprises a backlight current amplitude and PWM duty data.
8. The backlight driving device according to any one of claims 1 to 7, wherein a plurality of backlight drivers in each of the backlight driver groups are connected in series; the backlight driver is disposed on a backlight panel for mounting the backlight.
9. An image display device is characterized by comprising an image processing device, a backlight driving device, a display panel and a backlight source which are connected in sequence; the backlight driving device adopts the backlight driving device of any one of claims 1 to 8;
the image processing device is used for transmitting the partition brightness information to the backlight driving device according to the image data to be displayed and controlling the display panel to display according to the image data;
the backlight driving device is used for driving the backlight source to provide backlight for the display panel, and the backlight source is provided with a plurality of backlight subareas.
10. A backlight driving method, comprising:
determining backlight driving data corresponding to each backlight driver according to the partition brightness information transmitted by the image processing device; wherein each backlight driver is configured to drive at least one backlight partition of the backlight source according to corresponding backlight drive data; the partition brightness information is determined by the image processing device according to image data to be displayed;
respectively sending backlight driving data corresponding to the backlight drivers in the backlight driver group to the corresponding backlight driver group through each path of serial bus; wherein each backlight driver group comprises a plurality of backlight drivers.
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| WO (1) | WO2022223030A1 (en) |
Cited By (2)
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|---|---|---|---|---|
| CN116682339A (en) * | 2023-03-21 | 2023-09-01 | 海信视像科技股份有限公司 | Data communication method, display device and electronic equipment |
| CN116913220A (en) * | 2023-07-14 | 2023-10-20 | 北京显芯科技有限公司 | Data transmission method, backlight controller and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010147293A1 (en) * | 2009-06-15 | 2010-12-23 | 엘지전자 주식회사 | Display device |
| CN106097982A (en) * | 2016-07-27 | 2016-11-09 | 青岛海信电器股份有限公司 | Method for controlling backlight thereof, device and liquid crystal indicator in liquid crystal indicator |
| CN106981273A (en) * | 2017-06-01 | 2017-07-25 | 青岛海信电器股份有限公司 | Backlight brightness control devices, image display device |
| CN109064980A (en) * | 2018-09-25 | 2018-12-21 | 四川长虹电器股份有限公司 | Liquid crystal display backlight multi partition control device |
| CN209591492U (en) * | 2019-03-15 | 2019-11-05 | 昆山龙腾光电有限公司 | A kind of backlight control circuit |
| CN210136709U (en) * | 2019-06-17 | 2020-03-10 | 昆山龙腾光电股份有限公司 | Backlight testing device and display |
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2021
- 2021-12-09 CN CN202111498322.XA patent/CN115240604A/en active Pending
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116682339A (en) * | 2023-03-21 | 2023-09-01 | 海信视像科技股份有限公司 | Data communication method, display device and electronic equipment |
| CN116682340A (en) * | 2023-03-21 | 2023-09-01 | 海信视像科技股份有限公司 | Data communication method, display device and electronic equipment |
| CN116682339B (en) * | 2023-03-21 | 2024-05-17 | 海信视像科技股份有限公司 | Data communication method, display device and electronic equipment |
| CN116913220A (en) * | 2023-07-14 | 2023-10-20 | 北京显芯科技有限公司 | Data transmission method, backlight controller and display device |
| CN116913220B (en) * | 2023-07-14 | 2024-05-03 | 北京显芯科技有限公司 | Data transmission method, backlight controller and display device |
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| WO2022223030A1 (en) | 2022-10-27 |
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