CN117558241A - Backlight circuit and backlight system - Google Patents
Backlight circuit and backlight system Download PDFInfo
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- CN117558241A CN117558241A CN202311755329.4A CN202311755329A CN117558241A CN 117558241 A CN117558241 A CN 117558241A CN 202311755329 A CN202311755329 A CN 202311755329A CN 117558241 A CN117558241 A CN 117558241A
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- 239000004973 liquid crystal related substance Substances 0.000 description 4
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Classifications
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
Abstract
According to the backlight circuit and the backlight system, when the control chip obtains the local dimming data, the brightness adjustment data are also obtained, the local dimming data are compensated and/or adjusted based on the brightness adjustment data, the driving signals are generated based on the compensated and/or adjusted local dimming data, the light-emitting elements are driven to emit light, the data integrity is improved in the process of compensating and/or adjusting the local dimming data, the backlight control precision based on the driving signals is improved, compared with the process of performing the operation in the main controller at the upstream of the control chip, the process of converting the data format based on the SPI protocol is saved, the processing flow is simplified, and the light-emitting efficiency of the backlight circuit is guaranteed.
Description
Technical Field
The embodiment of the application relates to the field of LED display, in particular to a backlight circuit and a backlight system.
Background
The display device includes a backlight circuit board and an LCD display, and the backlight circuit board provides backlight to the LCD display to display a picture. The display device adjusts the brightness generated by the backlight circuit board according to different requirements so as to regulate and control the picture display quality, and is energy-saving and environment-friendly.
In the prior art, a local dimming data calculation circuit is generally set in a controller, and the local dimming data calculation circuit generates local dimming data according to data to be displayed, and transmits the local dimming data to a backlight circuit board based on a serial peripheral interface (Serial Peripheral Interface, abbreviated as SPI) protocol to drive the backlight circuit board to emit light. However, due to the different structures of the local dimming data calculation circuits in different controllers, the supported formats of the SPI protocols are different, so that the content of the local dimming data transmitted by different controllers in the same scene is different. For example: the command formats are different, and the data types contained in the backlight data are different; the amount of data contained in the local dimming data is different. When the controller supporting the SPI protocol with less information transmits the local dimming data to the backlight circuit board, the backlight circuit board obtains less local dimming data (such as lack of current data), and the effect of backlight adjustment is poor.
In a local dimming data calculation circuit, local backlight data is regulated based on preset dimming information (for example, brightness information set by a user through control equipment), and then output based on an SPI protocol, so that the backlight brightness regulation effect is improved.
Therefore, how to simply and rapidly improve the backlight adjusting effect of the backlight circuit board has become an important point of research.
Disclosure of Invention
The application provides a backlight circuit and a backlight system, which are used for solving the technical problems.
In a first aspect, embodiments of the present application provide a backlight circuit board, including a control chip and a plurality of light emitting elements, where the control chip is electrically connected to the plurality of light emitting elements;
the control chip obtains local dimming data and brightness adjustment data, and compensates and/or adjusts the local dimming data based on the brightness adjustment data;
the control chip generates a driving signal based on the compensated and/or adjusted local dimming data to drive the plurality of light emitting elements to emit light.
In the technical scheme, the control chip compensates and/or adjusts the local dimming data based on the SPI protocol by utilizing the brightness adjustment data, generates a driving signal based on the compensated and/or adjusted local dimming data, and drives the light-emitting element to emit light.
Optionally, the local dimming data includes a plurality of dimming sub-data, the brightness adjustment data includes a plurality of adjustment sub-data, and the dimming sub-data and the adjustment sub-data are in one-to-one correspondence;
the control chip obtains local dimming data and brightness adjustment data, compensates and/or adjusts the local dimming data based on the brightness adjustment data, and comprises:
for each dimming sub-data, the control chip acquires the corresponding adjusting sub-data of the dimming sub-data according to the one-to-one correspondence of the dimming sub-data and the adjusting sub-data, and compensates and/or adjusts the dimming sub-data based on the adjusting sub-data.
Optionally, for each piece of the dimming sub data, the control chip obtains adjustment sub data corresponding to the dimming sub data according to a one-to-one correspondence between the dimming sub data and the adjustment sub data, and compensates and/or adjusts the dimming sub data based on the adjustment sub data, including:
for each piece of dimming sub data, the control chip arranges the dimming sub data and the corresponding adjustment sub data according to a preset compensation sequence to generate compensated dimming sub data;
and/or
For each piece of dimming sub-data, the control chip calculates the dimming sub-data and the corresponding adjustment sub-data according to a preset operation rule to generate the adjusted dimming sub-data.
Optionally, the dimmer sub-data comprises drive data;
when the driving data comprise PWM data, the adjustment sub-data comprise current data corresponding to the driving data;
when the driving data comprise current data, the adjustment sub-data comprise PWM data corresponding to the driving data;
for each dimming sub-data, the control chip arranges the dimming sub-data and the corresponding adjustment sub-data according to a preset compensation sequence, and generates compensated dimming sub-data, which comprises:
and the control chip arranges the corresponding PWM data and current data according to a first preset compensation sequence to generate compensated driving data.
In the technical scheme, when the local dimming data lacks part of the driving data due to the format limitation of the SPI protocol, the control chip obtains the brightness adjustment data and compensates the driving data, so that the backlight circuit can emit light based on PWM data and current data in the driving data, and the control precision of the backlight circuit is improved.
Optionally, the dimmer sub-data comprises control data; when the format of the control data does not meet the preset format, the adjustment sub-data comprises control compensation data corresponding to the control data;
for each dimming sub-data, the control chip arranges the dimming sub-data and the corresponding adjustment sub-data according to a preset compensation sequence, and generates compensated dimming sub-data, which comprises:
and the control chip arranges the corresponding control compensation data and the control data according to a second preset compensation sequence to generate compensated control data.
In the above technical solution, when the control chip loses the control data due to format limitation of the SPI protocol, the control chip obtains the brightness adjustment data, and compensates the corresponding control data by using a plurality of control compensation data in the brightness adjustment data, so that the compensated control data supports more control modes without changing a circuit structure for controlling the generation of the control data, thereby increasing control diversity of the backlight circuit.
Optionally, the dimming sub-data includes driving data, the driving data including PWM data and/or current data;
the adjustment sub-data comprises driving adjustment data corresponding to the driving data;
the preset operation rule comprises a preset replacement rule;
for each dimming sub-data, the control chip calculates the dimming sub-data and the corresponding adjustment sub-data according to a preset operation rule, and generates adjusted dimming sub-data, which comprises:
and for each dimming sub-data, the control chip replaces the PWM data or the current data with the driving adjustment data according to the preset replacement rule.
Optionally, the drive adjustment data includes PWM replacement data and/or current replacement data;
for each dimming sub-data, the control chip replaces the PWM data or the current data with the driving adjustment data according to the preset replacement rule, including:
when the driving adjustment data comprise current replacement data, replacing current data in driving data corresponding to the driving adjustment data with the current replacement data;
when the driving adjustment data comprise PWM replacement data, the PWM data in the driving data corresponding to the driving adjustment data are replaced by the PWM replacement data.
Optionally, the dimming sub-data includes driving data, and the adjustment sub-data includes an adjustment ratio corresponding to the driving data;
the preset operation rule comprises a preset calculation rule;
for each dimming sub-data, the control chip calculates the dimming sub-data and the corresponding adjustment sub-data according to a preset operation rule, and generates adjusted dimming sub-data, which comprises:
for each dimming sub-data, the control chip takes the product of the adjustment ratio and the corresponding driving data as adjusted driving data according to the preset calculation rule.
Optionally, the driving data includes PWM data and/or current data, and the adjustment ratio includes a first sub-adjustment ratio and/or a second sub-adjustment ratio;
for each dimming sub-data, the control chip takes the product of the adjustment ratio and the corresponding driving data as adjusted driving data according to the preset calculation rule, and the method comprises the following steps:
when the adjustment ratio comprises the first sub-adjustment ratio, taking the product of the PWM data and the first sub-adjustment ratio as adjusted PWM data;
and when the adjustment ratio comprises the second sub-adjustment ratio, taking the product of the current data and the second sub-adjustment ratio as adjusted current data.
In the technical scheme, the control chip adjusts the local dimming data by utilizing the brightness adjustment data, so that the controller generating the local dimming data can be prevented from converting the data based on the SPI protocol after adjusting, the data supporting SPI protocol transmission can be generated, the dimming process is simplified, and the control efficiency is improved.
Optionally, the control chip is provided with a first input end and a second input end;
the control chip acquires the local dimming data from the first input end;
the control chip acquires the brightness adjustment data from the second input end;
the first input end supports a serial peripheral interface SPI protocol, and the second input end does not support the SPI protocol.
In the technical scheme, the control chip is provided with the first input end and the second input end to respectively obtain the original local dimming data and the brightness adjustment data, so that the control chip can obtain the data in parallel, and the data acquisition efficiency is ensured.
Optionally, the control chip includes a register;
the control chip acquires the pre-stored brightness adjustment data from the register.
In a second aspect, the present application provides a backlight system comprising a controller and the backlight circuit of the first aspect;
the controller is provided with a first output end and a second output end;
the first output end is electrically connected with the first input end of the control chip through a first I2C bus to transmit the local dimming data, wherein the first I2C bus supports SPI protocol;
the second output end is electrically connected with the second input end of the control chip through a second I2C bus to transmit the brightness adjustment data, wherein the second I2C bus does not support the SPI protocol.
The backlight circuit and the backlight system provided by the embodiment of the application comprise the control chip and the plurality of light emitting elements electrically connected with the control chip, wherein the control chip obtains local dimming data and brightness adjustment data, and compensates and/or adjusts the local dimming data based on the brightness adjustment data, so that the control chip generates driving signals based on the compensated and/or adjusted local dimming data to drive the plurality of light emitting elements to emit light.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is an application scenario diagram of a display device provided according to an exemplary embodiment of the present application;
fig. 2A and 2B are circuit configuration diagrams of a conventional display device provided according to an exemplary embodiment of the present application;
FIG. 3 is a schematic diagram of a control chip according to an exemplary embodiment of the present application;
fig. 4A and 4B are circuit configuration diagrams of a backlight circuit provided according to an exemplary embodiment of the present application;
fig. 5 is a circuit configuration diagram of a dimming controller provided according to an exemplary embodiment of the present application.
Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element, and furthermore, elements having the same name in different embodiments of the present application may have the same meaning or may have different meanings, a particular meaning of which is to be determined by its interpretation in this particular embodiment or by further combining the context of this particular embodiment.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Fig. 1 is an application scenario diagram of a display device according to an exemplary embodiment of the present application. As shown in fig. 1, the application scenario includes a server 001, a display device 002, a control apparatus 003, and a user 004.
The display device 002 is a device that can output an image or video, that is, a device that generates a corresponding image from input image data or video data.
In some scenarios, the display 002 is controlled to operate by the control device 003. In this case, the control device 003 is communicatively connected to the display apparatus 002, and after obtaining the configuration information, the display apparatus 002 generates control information based on the configuration information and transmits the control information to the display apparatus 002 to control it to display the corresponding screen.
The control device 003 includes, but is not limited to, an intelligent terminal and a remote control device. Configuration information is entered by user 004 through input devices of control device 003, including, but not limited to: keyboard, mouse, touch screen, voice input device.
In other cases, the display device 002 directly displays the corresponding screen with the configuration information obtained by its input device. For example: configuration information obtained through a touch screen integrated in the display device 002 or configuration information obtained by gesture information, voice information of the user 004.
The display device 002 is also communicatively connected to the server 001, and downloads display data from the server 001 to perform a corresponding display.
A schematic circuit structure of a conventional display device 002 is shown in fig. 2A and 2B. The display device comprises a control unit and a display unit, wherein the control unit is electrically connected with the display unit, the control unit generates a driving signal, and the display unit displays a picture based on the driving signal.
The control unit includes a dimming controller 20, a main controller 30, and a timing controller (Timing Controller, abbreviated as TCON) 50. The display unit includes a backlight circuit board 10 and a liquid crystal display panel 40.
The main controller 30 is electrically connected to the TCON 50, and is configured to acquire display data and transmit the display data to the corresponding TCON 50. The TCON 50 is electrically connected to the liquid crystal display panel 40, and is configured to generate a control signal according to the display data, and control an LCD driver on the liquid crystal display panel 40 to drive a liquid crystal unit to display a picture corresponding to the display data.
The main controller 30 is electrically connected to the dimming controller 20, and the dimming controller 20 is electrically connected to the plurality of light emitting units 101 on the backlight circuit board 10. In one embodiment, the dimming controller 20 is disposed on the backlight circuit board 10, as shown in fig. 2A, the dimming controller 20 is electrically connected to the plurality of light emitting units 101 through on-board wiring; in another embodiment, the dimming controller 20 is a chip disposed outside the backlight circuit board 10, as shown in fig. 2B, and is electrically connected to a connector 102 disposed on the backlight circuit board 10 through a connection wire, and the connector 102 is electrically connected to the plurality of light emitting units 101 through on-board wiring. In one embodiment, the connection lines are flexible circuit boards (Flexible Printed Circuit, abbreviated as FPCs).
The main controller 30 is further configured to obtain display data, split the display data according to the number of the dimming controllers 20, and transmit the split display sub-data to the corresponding dimming controllers 20.
The backlight circuit board 10 has a plurality of light emitting units 101 distributed in an array, and the dimming controller 20 is provided with a plurality of output terminals, and each output terminal is electrically connected with a group of light emitting units 101 connected in series. As shown in fig. 3, each light emitting unit 101 includes a driving unit 1011 and at least one light emitting element 1012, and the driving unit 1011 and the light emitting element 1012 are electrically connected.
The driving unit 1011 is provided with an input terminal DI, a power supply terminal VDD, a ground terminal GND, and an output terminal DO. The power supply terminal VDD is electrically connected to a power line laid out on the backlight circuit board 10 for receiving a power signal; the ground terminal GND is electrically connected to a ground line laid out on the backlight circuit board 10 for grounding; the input terminal DI is electrically connected to the output terminal of the device located upstream, and is configured to receive a signal transmitted by the device located upstream, so that the driving unit 1011 obtains driving data of a preset length corresponding to the current display unit from the obtained signal, generates a driving signal according to the driving data, drives the light emitting elements 1012 electrically connected to the plurality of output terminals thereof to emit light, and outputs a signal containing the remaining driving data from the output terminal DO thereof. The light-emitting element 1012 has different light-emitting luminance depending on the driving signal.
The light emitting element 1012 includes a plurality of LEDs, each of which is electrically connected in series in one embodiment. In the light emitting element 1012, the driving signals obtained by the LEDs are the same, and the average light emission luminance generated in accordance with the driving signals in one frame light emission period is the same. The LEDs include, but are not limited to, organic light-emitting diodes (OLEDs), mini LEDs, micro-OLEDs.
The master controller 30 includes a local dimming data calculation circuit 301, and the local dimming data (Local Dimming Data, abbreviated as LD data) outputted from the output terminal of the local dimming data calculation circuit 301 is data supporting the serial peripheral interface (Serial Peripheral interface, abbreviated as SPI) protocol, so that the local dimming data calculation circuit 301 needs to perform format conversion according to a data format supported by the SPI protocol after generating the local dimming data based on the display data, and then transmit the local dimming data to the dimming controller 20.
However, the local dimming data calculation circuit 301 in different masters 30 has different structures, and the supported SPI protocol has different formats, which results in different contents of the local dimming data transmitted in the same scene. For example: control data (command) formats are different; the types of data contained in the local dimming data are different; the amount of data contained in the local dimming data is different.
Wherein, the command formats are different in terms of different data lengths of the command, and the corresponding achievable control modes are different, and in some embodiments, the control modes include: PWM mode, DC mode, black insertion function, global dimming (backlight normally on) mode, ticker mode.
The different data types of the local dimming data are inconsistent driving data in the LD data, and the local dimming data are current data and/or PWM data, wherein the current data regulate and control the light emitting brightness of the light emitting element 1012 at instant through a PAM driving circuit in the control chip, the PWM data regulate and control the light emitting duration duty ratio of the light emitting element 1012 in a frame light emitting period through a PWM driving circuit in the control chip, and the current data and the PWM data are used for jointly driving the light emitting brightness of the light emitting element 1012 through the PAM driving circuit and the PWM driving circuit in the control chip, wherein the current data and the PWM data are jointly driven and regulated, and the light emitting precision of the backlight circuit board 10 is highest.
The difference in the amount of data contained in the local dimming data is represented by the difference in the bit width of the driving data in the LD data, for example: 8bit, 22bit, etc., and the driving precision of driving data of different bit widths is different.
After the master 30 supporting the SPI protocol with less information transmits the local dimming data to the backlight circuit board 10, the backlight circuit board 10 has a poor effect on backlight adjustment based on the local dimming data, and in some scenes, cannot meet the dimming requirement of the user. Because the local dimming data calculation circuit 301 supporting the SPI protocol in the master controller 30 has a complex structure and is not easy to adjust, and meanwhile, the calculation process of the circuit on the local dimming data based on the preset dimming information is complex, which affects the calculation efficiency of the master controller.
Therefore, how to simply and rapidly improve the backlight adjusting effect of the backlight circuit board has become an important point of research.
In order to solve the above problems, the present application provides a backlight circuit and a backlight system. The technical conception of the application is as follows: when the control chip obtains the local dimming data, brightness adjustment data is also obtained, the local dimming data is compensated and/or adjusted based on the brightness adjustment data, a driving signal is generated based on the compensated and/or adjusted local dimming data, and the light-emitting element is driven to emit light.
The circuit configuration of the backlight system provided in the present application is explained below. The circuit structure of the backlight system is shown in fig. 4A and 4B.
In fig. 4A and 4B, a local dimming data calculation circuit 301 and a brightness adjustment data generation circuit 302 are provided in the master 30.
The local dimming data calculation circuit 301 is configured to obtain display data and generate local dimming data, i.e., an LD signal as illustrated, from the display data.
The brightness adjustment data generation circuit 302 is configured to obtain brightness configuration information, and generate data for adjusting local dimming data based on the brightness configuration information, as brightness adjustment data.
In some embodiments, brightness adjustment data generation circuit 302 also obtains a data format supporting the SPI protocol with the largest amount of data, determines what needs to be compensated for the local dimming data based on the data format, and adds the compensated content to the brightness adjustment data.
The control chip of the backlight circuit is electrically connected to the local dimming data calculation circuit 301 and the luminance adjustment data generation circuit 302, and after the luminance adjustment data and the local dimming data are obtained, the local dimming data are compensated and/or adjusted based on the luminance adjustment data, and a driving signal is generated according to the compensated and/or adjusted local dimming data, so that the plurality of light emitting elements 1012 electrically connected to the control chip are driven to emit light.
In some embodiments, the control chip includes a dimming controller 20 and a driving unit 1011 of each light emitting unit 101.
In some cases, the dimming controller 20 obtains the brightness adjustment data and the local dimming data, compensates and/or adjusts the brightness adjustment data based on the local dimming data, generates target local dimming data, transmits the target local dimming data to each light emitting unit 101, obtains the corresponding sub-data from the target local dimming book by the driving unit 1011 in the light emitting unit 101, and generates a driving signal based on the sub-data to drive the light emitting element 1012 electrically connected thereto to emit light.
In other cases, the dimming controller 20 obtains the brightness adjustment data and the local dimming data, the brightness adjustment data includes dimming sub-data and adjustment sub-data corresponding to each light emitting unit 101, the dimming controller 20 constructs a plurality of groups of data based on the corresponding relationship between each dimming sub-data and adjustment sub-data, integrates the plurality of groups of data to generate target local dimming data, and transmits the target local dimming data to each driving unit 101, so that the driving unit 1011 obtains the corresponding dimming sub-data and adjustment sub-data therefrom, adjusts and/or compensates the dimming sub-data based on the adjustment sub-data, and then generates a driving signal to drive the corresponding light emitting element 1012 to emit light.
The control chip is provided with a first input end and a second input end, the main controller 30 is provided with a first output end and a second output end, and the first output end of the main controller 30 is electrically connected with the first input end of the control chip and is used for transmitting local dimming data. A second output of the master controller 30 is electrically coupled to a second input of the control chip for transmitting the brightness adjustment data.
An I2C bus is arranged between the first input end and the first output end, the bus supports the SPI protocol of the serial peripheral interface, an I2C bus is arranged between the second input end and the second output end, and the bus does not support the SPI protocol. The local dimming data calculation circuit 301 in the master 30 includes a circuit for performing data generation of the SPI protocol, and the brightness adjustment data generation band 302 does not need to include a circuit for performing data generation of the SPI protocol.
The data processing process of the brightness adjustment data by the local dimming data is explained below by taking the control chip as an execution main body.
The control chip obtains a plurality of dimming sub-data from the local dimming data, obtains a plurality of adjustment sub-data from the brightness adjustment data, and determines a correspondence between each dimming sub-data and each adjustment sub-data. In some embodiments, the control chip may determine the correspondence between the dimming sub-data and the adjustment sub-data based on the consistency principle according to the position information of each sub-data or the address information of the corresponding driving unit.
And the control chip compensates and/or adjusts the corresponding dimming sub-data based on the corresponding relation between the dimming sub-data and the adjusting sub-data.
The data structure of the local dimming data supporting the SPI protocol generated by the master will be briefly described as shown in table 1.
TABLE 1
| Wave head | Control data | Drive data | Wave tail |
| SPI signal identification zone bit | Command1～CommandN | Data1～DataN | Check bit |
As can be seen from table 1, the local dimming data includes a wave head, control data, driving data, and a wave tail.
There are a number of situations where the local dimming data transmitted based on the SPI protocol:
(1) The word number of the control data is smaller than the maximum word number, and the corresponding supported control mode is insufficient;
(2) Only current data exists in the driving data;
(3) Only PWM data exists in the driving data;
(4) The data bit width of the driving data is smaller than the maximum bit width, and the corresponding supported control precision is insufficient;
(5) The data in the control data and the driving data are initial information provided by the data source, and the set dimming configuration information is not correspondingly adjusted.
For the cases described in (1) to (4), it is necessary to compensate the local dimming data. When the data is compensated, aiming at each dimming sub-data in the local dimming data, the control chip arranges the corresponding adjusting sub-data in the dimming sub-data and the brightness adjusting data according to a preset compensation sequence to generate the compensated dimming sub-data.
The policies correspondingly generated by the backlight system are explained below for various cases.
Under the scene that the word number of the control data is smaller than the maximum word number, namely when the format of the control data does not meet the preset format, a plurality of control compensation data are obtained from a plurality of adjustment sub-data of the brightness adjustment data; the plurality of control compensation data and the plurality of control data are in one-to-one correspondence. The control chip arranges the corresponding control compensation data and the control data according to a second preset compensation sequence to generate compensated control data.
That is, each control compensation data is added to the corresponding control data to form new control data after or in the middle of the corresponding control data, so that the number of words of the compensated control data reaches the maximum number of words, the compensated control data supports more control modes, the circuit structure for generating the control data does not need to be changed, and the control diversity of the backlight circuit is increased.
Under the scene that only current data or only PWM data exist in the driving data, first driving compensation data are obtained from all adjustment sub-data of brightness adjustment data; the driving data and the first driving compensation data are in one-to-one correspondence, the first driving compensation data are data corresponding to the missing type in the driving data, and the first driving compensation data are further regulation and control data for the data which are already set in the driving data.
The control chip arranges the driving data and the corresponding first driving compensation data according to a first preset compensation sequence to generate compensated driving data.
More specifically, when only a plurality of current data exists in the driving data, the control chip obtains a corresponding number of PWM data, which is first driving compensation data, from the brightness adjustment data; when the driving data includes PWM data, the control chip acquires a corresponding amount of current data, which is first driving compensation data, from the brightness adjustment data.
And when the data bit width of the driving data is smaller than the maximum bit width, acquiring second driving compensation data from each adjustment sub-data of the brightness adjustment data, and arranging the driving data and the corresponding second driving compensation data according to the corresponding relation between each second driving compensation data and each driving data in the local dimming data and a third preset compensation sequence to generate compensated driving data.
For the case described in (5), data adjustment of the local dimming data is required. When the data is adjusted, aiming at each dimming sub-data in the local dimming data, the control chip calculates the corresponding adjusting sub-data in the dimming sub-data and the brightness adjusting data according to a preset operation rule, and generates the adjusted dimming sub-data.
In some cases, when the driving data includes PWM data and current data, the control chip acquires driving adjustment data corresponding to each driving data from the brightness adjustment data, and for each dimming sub-data, the control chip replaces the PWM data or the current data with the driving adjustment data according to a preset replacement rule.
For example: when the display device carries out backlight adjustment, the main controller at the upstream of the control chip generates corresponding current data according to preset brightness configuration information, the current data is applied to part or all areas of the backlight circuit, and the backlight of each display unit is adjusted by setting different PWM data for each display unit in the area with the same current data. At this time, when the local dimming data obtained by the control chip includes the current data set in history, the control chip obtains the brightness adjustment data including the current data generated by the updated brightness configuration information, and replaces the current data in the brightness adjustment data with the original current data in the local dimming data, so as to realize dimming.
The brightness adjustment data are data transmitted to the control chip by the main controller, and may be data preset in the control chip.
In other cases, the display device needs to perform backlight adjustment by adjusting the driving data proportionally, and then the control chip obtains an adjustment ratio corresponding to each driving data in the local dimming data from the brightness adjustment data, and for each dimming sub-data, the control chip takes the product of the adjustment ratio and the corresponding driving data as adjusted driving data according to a preset calculation rule.
More specifically, when the driving data includes PWM data and/or current data, the adjustment ratio includes a first sub-adjustment ratio corresponding to each PWM data and/or a second sub-adjustment ratio corresponding to each current data.
When the PWM data in each driving data are adjusted, a first sub-adjustment ratio is obtained from the adjustment ratio, and the product of the PWM data and the first sub-adjustment ratio is used as adjusted PWM data.
When the current data in each driving data is adjusted, a second sub-adjustment ratio is obtained from the adjustment ratio, and the product of the current data and the second sub-adjustment ratio is used as adjusted current data.
When the above-described process of compensating and/or adjusting data is performed in the dimming controller 20, the circuit structure of the dimming controller 20 includes a first signal receiving circuit 201, a second signal receiving circuit 202, a data processor, a register 204, and a driving signal transmitting circuit 205 as shown in fig. 5.
The first signal receiving circuit 201 is electrically connected to a first output terminal of the main controller 301, and is configured to receive a local dimming signal, i.e., an LD signal.
The second signal receiving circuit 202 is electrically connected to the second output terminal of the main controller 301, and is configured to receive the brightness adjustment data.
Wherein the first signal receiving circuit 201 and the second signal receiving circuit 202 simultaneously receive corresponding data within the same period.
The first signal receiving circuit 201 and the second signal receiving circuit 202 are respectively electrically connected to the data processor 203, and the data processor 203 is configured to obtain brightness adjustment data and local dimming data, process the local dimming data based on the above-mentioned compensated and/or adjusted data processing procedure, and then transmit the processed data to the driving signal transmitting circuit 205 electrically connected thereto, and further store the obtained data in the register 204.
The register 204 is electrically connected to the data processor 203 and also electrically connected to the drive signal transmitting circuit 205, in which pre-configured data is stored, for example: configuration information corresponding to each control mode.
After obtaining the local dimming data, the data processor 203 may obtain control data therefrom and transmit the control data into the register 204, so that the register 204 transmits corresponding configuration information to the driving signal transmission circuit 205 in response to the obtained control data.
The driving signal transmitting circuit 205 generates driving data based on the obtained driving data and the configuration information corresponding to the control data supplied from the register 204, and transmits the driving data to each driving unit 1011 electrically connected thereto, so that each driving unit 1011 generates a corresponding driving signal based on the driving data to drive the light emitting element 1012 to emit light.
In other embodiments, the dimming controller 20 obtains the brightness adjustment data from its second signal receiving circuit 202 only after the brightness adjustment data generating circuit 302 in the master 30 upstream thereof obtains the changed brightness configuration information. For example: the luminance adjustment data includes fixed current data set based on the luminance configuration information or an adjustment ratio set based on the luminance configuration information.
The second receiving circuit 202 transmits the brightness adjustment data to the data processor 203, so that the data processor 203 stores the brightness adjustment data in the register 204. When the LD signal is obtained from the first receiving circuit 201, the data processor 203 acquires the pre-stored luminance adjustment data from the register 204, compensates and/or adjusts the LD signal using the luminance adjustment data, and transmits the result to the driving signal transmitting circuit 205 so that it generates driving data.
The present application further provides a display, which includes the backlight system shown in fig. 4A and fig. 4B, where the circuit structure of the backlight system is explained in detail in the foregoing embodiments, and will not be described herein again.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (12)
1. A backlight circuit, comprising a control chip and a plurality of light emitting elements, wherein the control chip is electrically connected with the plurality of light emitting elements;
the control chip obtains local dimming data and brightness adjustment data, and compensates and/or adjusts the local dimming data based on the brightness adjustment data;
the control chip generates a driving signal based on the compensated and/or adjusted local dimming data to drive the plurality of light emitting elements to emit light.
2. The backlight circuit of claim 1, wherein the local dimming data comprises a plurality of dimming sub-data, the brightness adjustment data comprises a plurality of adjustment sub-data, the dimming sub-data and the adjustment sub-data are in one-to-one correspondence;
the control chip obtains local dimming data and brightness adjustment data, compensates and/or adjusts the local dimming data based on the brightness adjustment data, and comprises:
for each dimming sub-data, the control chip acquires the corresponding adjusting sub-data of the dimming sub-data according to the one-to-one correspondence of the dimming sub-data and the adjusting sub-data, and compensates and/or adjusts the dimming sub-data based on the adjusting sub-data.
3. The backlight circuit according to claim 2, wherein for each of the dimming sub-data, the control chip obtains adjustment sub-data corresponding to the dimming sub-data according to a one-to-one correspondence between the dimming sub-data and the adjustment sub-data, and compensates and/or adjusts the dimming sub-data based on the adjustment sub-data, comprising:
for each piece of dimming sub data, the control chip arranges the dimming sub data and the corresponding adjustment sub data according to a preset compensation sequence to generate compensated dimming sub data;
and/or
For each piece of dimming sub-data, the control chip calculates the dimming sub-data and the corresponding adjustment sub-data according to a preset operation rule to generate the adjusted dimming sub-data.
4. A backlight circuit according to claim 3, wherein the dimming sub-data comprises driving data;
when the driving data comprise PWM data, the adjustment sub-data comprise current data corresponding to the driving data;
when the driving data comprise current data, the adjustment sub-data comprise PWM data corresponding to the driving data;
for each dimming sub-data, the control chip arranges the dimming sub-data and the corresponding adjustment sub-data according to a preset compensation sequence, and generates compensated dimming sub-data, which comprises:
and the control chip arranges the corresponding PWM data and current data according to a first preset compensation sequence to generate compensated driving data.
5. A backlight circuit according to claim 3 or 4, wherein the dimming sub-data comprises control data; when the format of the control data does not meet the preset format, the adjustment sub-data comprises control compensation data corresponding to the control data;
for each dimming sub-data, the control chip arranges the dimming sub-data and the corresponding adjustment sub-data according to a preset compensation sequence, and generates compensated dimming sub-data, which comprises:
and the control chip arranges the corresponding control compensation data and the control data according to a second preset compensation sequence to generate compensated control data.
6. A backlight circuit according to claim 3 or 4, wherein the dimming sub-data comprises drive data, the drive data comprising PWM data and/or current data;
the adjustment sub-data comprises driving adjustment data corresponding to the driving data;
the preset operation rule comprises a preset replacement rule;
for each dimming sub-data, the control chip calculates the dimming sub-data and the corresponding adjustment sub-data according to a preset operation rule, and generates adjusted dimming sub-data, which comprises:
and for each dimming sub-data, the control chip replaces the PWM data or the current data with the driving adjustment data according to the preset replacement rule.
7. A backlight circuit as claimed in claim 6, wherein,
the drive adjustment data includes PWM replacement data and/or current replacement data;
for each dimming sub-data, the control chip replaces the PWM data or the current data with the driving adjustment data according to the preset replacement rule, including:
when the driving adjustment data comprise current replacement data, replacing current data in driving data corresponding to the driving adjustment data with the current replacement data;
when the driving adjustment data comprise PWM replacement data, the PWM data in the driving data corresponding to the driving adjustment data are replaced by the PWM replacement data.
8. A backlight circuit according to claim 3 or 4, wherein the dimming sub-data comprises driving data, and the adjustment sub-data comprises an adjustment value corresponding to the driving data;
the preset operation rule comprises a preset calculation rule;
for each dimming sub-data, the control chip calculates the dimming sub-data and the corresponding adjustment sub-data according to a preset operation rule, and generates adjusted dimming sub-data, which comprises:
for each dimming sub-data, the control chip takes the product of the adjustment ratio and the corresponding driving data as adjusted driving data according to the preset calculation rule.
9. A backlight circuit according to claim 8, wherein the driving data comprises PWM data and/or current data, the adjustment ratio comprising a first sub-adjustment ratio and/or a second sub-adjustment ratio;
for each dimming sub-data, the control chip takes the product of the adjustment ratio and the corresponding driving data as adjusted driving data according to the preset calculation rule, and the method comprises the following steps:
when the adjustment ratio comprises the first sub-adjustment ratio, taking the product of the PWM data and the first sub-adjustment ratio as adjusted PWM data;
and when the adjustment ratio comprises the second sub-adjustment ratio, taking the product of the current data and the second sub-adjustment ratio as adjusted current data.
10. A backlight circuit according to any one of claims 1 to 4, wherein the control chip is provided with a first input and a second input;
the control chip acquires the local dimming data from the first input end;
the control chip acquires the brightness adjustment data from the second input end;
the first input end supports a serial peripheral interface SPI protocol, and the second input end does not support the SPI protocol.
11. The backlight circuit of claim 10, wherein the control chip comprises a register;
the control chip acquires the pre-stored brightness adjustment data from the register.
12. A backlight system comprising a controller and a backlight circuit as claimed in any one of claims 1 to 11;
the controller is provided with a first output end and a second output end;
the first output end is electrically connected with the first input end of the control chip through a first I2C bus to transmit the local dimming data, wherein the first I2C bus supports SPI protocol;
the second output end is electrically connected with the second input end of the control chip through a second I2C bus to transmit the brightness adjustment data, wherein the second I2C bus does not support the SPI protocol.
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| CN202311755329.4A CN117558241A (en) | 2023-12-19 | 2023-12-19 | Backlight circuit and backlight system |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110187283A1 (en) * | 2010-01-31 | 2011-08-04 | Microsemi Corporation | Dimming input suitable for multiple dimming signal types |
| CN102314844A (en) * | 2010-07-09 | 2012-01-11 | 乐金显示有限公司 | Liquid crystal indicator and local dimming drive the method for this liquid crystal indicator |
| CN105190454A (en) * | 2013-05-09 | 2015-12-23 | 三菱电机株式会社 | Programmable indicator |
| CN107864080A (en) * | 2017-10-20 | 2018-03-30 | 深圳市元征软件开发有限公司 | Auto communication method, apparatus and computer-readable recording medium |
| CN110147536A (en) * | 2019-05-24 | 2019-08-20 | 深圳市多翼创新科技有限公司 | A kind of data processing method based on File Mapping, device and equipment |
| CN110568806A (en) * | 2019-10-25 | 2019-12-13 | 上海电气集团股份有限公司 | Servo driver and servo driving system |
| CN111917752A (en) * | 2020-07-24 | 2020-11-10 | 南昌欧菲光电技术有限公司 | Communication interface conversion device |
| US20220036835A1 (en) * | 2020-07-30 | 2022-02-03 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Driving method and driver chip for display panel, and display device |
| CN115424594A (en) * | 2022-09-16 | 2022-12-02 | 北京显芯科技有限公司 | Data transmission method and controller |
-
2023
- 2023-12-19 CN CN202311755329.4A patent/CN117558241A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110187283A1 (en) * | 2010-01-31 | 2011-08-04 | Microsemi Corporation | Dimming input suitable for multiple dimming signal types |
| CN102314844A (en) * | 2010-07-09 | 2012-01-11 | 乐金显示有限公司 | Liquid crystal indicator and local dimming drive the method for this liquid crystal indicator |
| CN105190454A (en) * | 2013-05-09 | 2015-12-23 | 三菱电机株式会社 | Programmable indicator |
| CN107864080A (en) * | 2017-10-20 | 2018-03-30 | 深圳市元征软件开发有限公司 | Auto communication method, apparatus and computer-readable recording medium |
| CN110147536A (en) * | 2019-05-24 | 2019-08-20 | 深圳市多翼创新科技有限公司 | A kind of data processing method based on File Mapping, device and equipment |
| CN110568806A (en) * | 2019-10-25 | 2019-12-13 | 上海电气集团股份有限公司 | Servo driver and servo driving system |
| CN111917752A (en) * | 2020-07-24 | 2020-11-10 | 南昌欧菲光电技术有限公司 | Communication interface conversion device |
| US20220036835A1 (en) * | 2020-07-30 | 2022-02-03 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Driving method and driver chip for display panel, and display device |
| CN115424594A (en) * | 2022-09-16 | 2022-12-02 | 北京显芯科技有限公司 | Data transmission method and controller |
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