CN117423320A - Backlight unit control method, dimming controller and display device - Google Patents
Backlight unit control method, dimming controller and display device Download PDFInfo
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Abstract
According to the control method, the dimming controller and the display device for the backlight unit, the dimming controller obtains the number of columns of driving units in the backlight unit, sends an initial counting signal to at least one column of driving units, and receives a counting feedback signal returned by at least one column of driving units, so that parameters of backlight partitions in the backlight unit are determined according to the number of columns of the driving units and the counting feedback signal returned by at least one column of driving units, and the parameters of the backlight partitions are sent to the time sequence controller, so that the time sequence controller can generate dimming data of each driving unit according to the parameters of the backlight partitions and image data by using a preset dimming algorithm, backlight units of different scales can be adapted, partition data do not need to be configured in the time sequence controller in advance, and the debugging efficiency of the time sequence controller is improved.
Description
Technical Field
The present application relates to, but is not limited to, a control method of a backlight unit, a dimming controller, and a display device.
Background
With the development of technology, display devices are an important component of many electronic devices, such as: a liquid crystal display (Liquid Crystal Display, LCD display for short).
The display device is generally composed of a liquid crystal panel and a backlight unit. The backlight unit is positioned below the liquid crystal panel and is used for providing a backlight source for the liquid crystal panel.
Disclosure of Invention
Some embodiments of the present application provide a control method of a backlight unit, where the backlight unit includes a plurality of driving units arranged in an array, and the driving units in the same column are connected in cascade, and the control method is applied to a dimming controller, and the control method includes:
acquiring the column number of a driving unit in a backlight unit;
sending an initial counting signal to at least one column driving unit and receiving a counting feedback signal returned by the at least one column driving unit;
determining parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signals returned by at least one column driving unit;
and sending the parameters of the backlight partition to a time sequence controller, wherein the time sequence controller is used for processing the parameters of the backlight partition and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
Some embodiments of the present application provide a control method of a backlight unit, where the backlight unit includes a plurality of driving units arranged in an array, and the driving units in the same column are connected in cascade, and the control method is applied to a controller, and the control method includes:
Acquiring the column number of a driving unit in a backlight unit;
sending an initial counting signal to at least one column driving unit and receiving a counting feedback signal returned by the at least one column driving unit;
determining parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signals returned by at least one column driving unit;
and acquiring image data, and processing the parameters of the backlight partition and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
Some embodiments of the present application provide a dimming controller, where a backlight unit includes a plurality of driving units arranged in an array, and the driving units in the same column are connected in cascade, and the dimming controller includes a first transceiver, a storage module, an initial count signal module, a second transceiver, and a processing module;
the first transceiver receives the column number of the driving unit in the backlight unit and stores the column number of the driving unit in the storage module;
the second transceiver transmits an initial counting signal to at least one column driving unit and receives a counting feedback signal returned by the at least one column driving unit; and storing the count feedback signal in a memory module;
the processing module determines parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signals returned by at least one column driving unit;
The first transceiver transmits parameters of the backlight partition to the time schedule controller, and the time schedule controller is used for processing the parameters of the backlight partition and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
Some embodiments of the present application provide a display apparatus including the dimming controller, the timing controller, the backlight unit, and the liquid crystal panel according to the above embodiments.
According to the control method, the dimming controller and the display device for the backlight unit, the dimming controller obtains the number of columns of the driving units in the backlight unit, sends an initial counting signal to at least one column of driving units, and receives a counting feedback signal returned by at least one column of driving units, so that parameters of backlight partitions in the backlight unit are determined according to the number of columns of the driving units and the counting feedback signal returned by at least one column of driving units, and the parameters of the backlight partitions are sent to the time sequence controller, so that the time sequence controller generates dimming data of each driving unit according to the parameters of the backlight partitions and image data by using a preset dimming algorithm, backlight units of different scales can be adapted, partition data do not need to be configured in the time sequence controller in advance, and the debugging efficiency of the time sequence controller is improved.
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 a schematic structural diagram of a display device according to some embodiments of the present application;
fig. 2 is a schematic structural diagram of a display device according to other embodiments of the present application;
fig. 3 is a schematic structural view of a backlight unit according to other embodiments of the present application;
FIG. 4 is a flowchart of a method for controlling a backlight unit according to other embodiments of the present disclosure;
FIG. 5A is a flow chart of signal transmission of the 1 st driving unit according to some embodiments of the present application;
FIG. 5B is a flow chart of signal transmission of the 2 nd drive unit according to some embodiments of the present application;
FIG. 5C is a flow chart of signal transmission of the 3 rd drive unit according to some embodiments of the present application;
FIG. 5D is a flow chart of signal transmission of the 4 th driving unit according to some embodiments of the present application;
FIG. 5E is a schematic diagram of a controller receiving a count feedback signal according to some embodiments of the present application;
FIG. 6 is a schematic diagram of generating a count feedback signal according to further embodiments of the present application;
Fig. 7 is a schematic structural diagram of a dimming controller according to some embodiments of the present application.
Reference numerals:
101. a backlight unit; 102. a liquid crystal panel; 104. a timing controller; 105. a dimming controller; 10. a driving unit; 20. and a light emitting unit.
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 aspects of the present application.
Display devices are an important component of many electronic devices, for example: a television provided with a display device, a monitor provided with a display device, and the like.
Fig. 1 is a schematic structural diagram of a display device according to some embodiments of the present application, and as shown in fig. 1, the display device according to some embodiments of the present application includes a controller 103, a backlight Unit (BLU) and a liquid crystal panel 102. The controller 103 is configured to receive video data and generate image data based on the video data, the image data being used to drive the liquid crystal panel 102 to operate. The controller is further configured to generate dimming data according to the image data, the dimming data being configured to control a driving unit within the backlight unit 101 to generate a backlight driving signal. The driving unit supplies a backlight driving signal to the light emitting unit, and the backlight driving signal can control the light emitting brightness of the light emitting unit so as to provide backlights with different brightness.
Fig. 2 is a schematic structural diagram of a display device according to other embodiments of the present application, and as shown in fig. 2, the controller 103 includes a dimming controller (Dimming Controller) and a timing controller (Timing Controller, abbreviated as TCON). The timing controller is used for generating image data according to video data, and the dimming controller 105 generates dimming data according to the image data output by the timing controller.
In some embodiments, the timing controller is configured to generate image data from the video data and to generate dimming data from the image data. The dimming controller receives the dimming data output by the timing controller and forwards the dimming data to the backlight unit.
Compared with the LED chip for providing a backlight source, the Mini LED is used as the backlight source, so that the traditional LED chip is reduced. Therefore, the original dozens, hundreds and thousands of backlight beads are changed into thousands and tens of thousands, the number of backlight partitions can be increased from dozens, hundreds to thousands and tens of thousands, each area corresponds to a plurality of pixel points, and the area dimming technology is combined to perform finer brightness control on the backlight.
Mini LEDs are illustrated as backlights below. Fig. 3 is a schematic structural diagram of a backlight unit 101 according to other embodiments of the present application, and as shown in fig. 3, the backlight unit 101 includes a plurality of driving units 10, and the plurality of driving units 10 are distributed in an array. For example: distributed in an M x N array. Each driving unit 10 is connected to a plurality of light emitting units 20. More specifically, the driving unit 10 is provided with a plurality of output channels, each of which is connected to a control terminal of one of the light emitting units 20, and a power supply terminal of each of the light emitting units 20 is connected to a power source (not shown), and the driving unit 10 is configured to supply the backlight driving signal to the light emitting unit 20. For example: the light emitting unit 20 includes a plurality of Mini light emitting diodes (Mini LEDs) connected in series, and a positive electrode of the Mini light emitting diode located at a head end is used as a power supply end of the light emitting unit 20 for connection to a power source. The cathode of the mini light emitting diode at the end is used as the control terminal of the light emitting unit 20 for connection with the driving unit 10.
More specifically, the driving unit sends a backlight driving signal to each output channel of the driving unit based on the acquired control data, and controls the light emitting brightness of the light emitting unit corresponding to each output channel, thereby controlling the backlight brightness of the backlight partition where each light emitting unit is located.
With continued reference to fig. 3, the driving units 10 arranged in the first direction H are referred to as a column driving unit 10, and the driving units 10 arranged in the second direction V are referred to as a row driving unit 10. For example: in fig. 3, N column driving units 10 and m row driving units 10 are shown.
The driving units 10 on the same column are connected in cascade, and the driving unit 10 on the 1 st column is also connected with a controller. For example: taking the 1 st column driving unit as an example, the driving unit of the 1 st row is connected with the controller through a data line, the driving unit of the 1 st row is connected with the driving unit of the 2 nd row through a data line, the driving unit of the 2 nd row is connected with the driving unit of the 3 rd row through a data line, and the driving unit of the (M-1) row is connected with the driving unit of the M th row through a data line. The data lines between the controller and the 1 st row driving unit, the data lines between the 1 st row driving unit and the 2 nd row driving unit, and the data lines between the driving unit of the (M-1) th row and the driving unit of the M-th row … … are referred to as data transmission lines 201.
The controller is configured to send dimming data to the plurality of cascaded driving units 10, where the dimming data includes data packets corresponding to the plurality of driving units 10 arranged in sequence, and each data packet corresponding to the driving unit 10 includes control data corresponding to the driving unit 10 and an end bit.
The driving unit 10 is configured to obtain control data of a preset length from the controller or a previous driving unit 10, and detect whether the end bit is a preset value; if the end bit is a preset value and the next driving unit 10 exists, the dimming data after the end bit is transmitted to the next driving unit 10.
Specifically, the controller is configured to transmit dimming data, and the dimming data may include data packets corresponding to the plurality of driving units 10, wherein an arrangement order of the data packets is the same as a cascade order of the driving units 10. That is, in the dimming data, the ith data packet is a data packet corresponding to the ith driving unit 10, i is 1+.ltoreq.m, and M is the number of driving units 10.
Each driving unit 10 is configured to obtain a corresponding data packet, and perform a corresponding operation according to the corresponding data packet. Each data packet may include control data and an end bit, the control data may be a preset length, and the control data may be disposed before the end bit. The end bit must be a predetermined value to continue transmitting dimming data downward.
For convenience of description, in the embodiment of the present invention, the length of the control data corresponding to each driving unit is 4, and the preset value is 0.
After each driving unit acquires the 4-bit control data, it can detect whether the 5 th bit data, i.e. the end bit, is 0, if so, the dimming data after the end bit is transferred to the next driving unit, and if not, the dimming data is not transferred downwards.
The dimming data sent by the controller may be 1010 0 1001 0 001 … …. The 1 st driving unit collects the 4-bit control data as 1010, then detects that the 5 th bit, namely the end bit, is 0, meets the requirements, and can downwards transmit the following data to the 2 nd driving unit. Thus, the signal of the output of the 1 st driving unit is 1001 0 001 … ….
After the 2 nd driving unit collects the 4 th control data 1001, it detects that the 5 th bit, i.e. the end bit, is 0, which meets the requirements, and can transfer the following data to the 3 rd driving unit. Therefore, the signal of the output of the 2 nd driving unit is 001 … …. And so on until the data is transferred to the last drive unit, so that the configuration of all drive units can be completed.
The principles and processes of operation of embodiments of the present invention have been described above by specific examples. It will be appreciated by those skilled in the art that the above examples may be adjusted according to actual needs, for example, the end bit may be set to 1 to indicate that the data is correct, or two or more data lines may be connected between two adjacent driving units 10 to transmit more data at a time, so as to improve the data transmission efficiency.
In some embodiments, the drive unit 10 implements control of whether data is transferred downwards by setting a flag. The drive unit 10 may also be used to: if it is detected that the end bit is a preset value, a transmission flag signal (Bypass flag) is set to a first state value to transmit the dimming data after the end bit to the next driving unit 10.
In some embodiments, the drive unit 10 may include a transmission switch; when the transmission flag signal is a first state value, the driving unit 10 controls the transmission switch to be turned on so as to transmit data to the next driving unit 10; when the transmission flag signal is not the first state value, the driving unit 10 controls the transmission switch to be turned off so as not to transfer data backward.
Fig. 4 is a flowchart of a control method of a backlight unit according to other embodiments of the present application, and as shown in fig. 4, some embodiments of the present application provide a control method of a backlight unit. The backlight unit comprises a plurality of driving units which are arranged in an array, the driving units in the same column are connected in cascade, the control method is applied to the dimming controller, and the control method comprises the following steps:
s101, the dimming controller acquires the column number of the driving unit in the backlight unit.
The number of columns of the driving units is used as a preset parameter, and the controller can receive the number of columns of the driving units sent by the external equipment, or can determine the number of columns of the driving units in the backlight unit by detecting the number of data transmission lines.
S102, the dimming controller sends an initial counting signal to at least one column driving unit and receives a counting feedback signal returned by the at least one column driving unit.
Wherein the backlight unit includes a plurality of column driving units.
In some embodiments, an initial count signal may be sent to each column drive unit, causing the drive units of each column to return a count feedback signal.
Taking the backlight unit shown in fig. 3 as an example, N initial count signals are generated when the number of columns of the driving units in the backlight unit is N. The 1 st initial count signal is sent to the 1 st column drive unit, causing the 1 st column drive unit to return a count feedback signal. The 2 nd initial count signal is sent to the 2 nd column drive unit, causing the 2 nd column drive unit to return a count feedback signal. And by analogy, the N initial counting signal is sent to the N driving unit, so that the N driving unit returns a counting feedback signal.
In some embodiments, an initial count signal may be sent to a portion of the column drive units, causing the column drive units to return a count feedback signal.
Taking the backlight unit shown in fig. 3 as an example, if the number of columns of the driving units in the backlight unit is N, 3 initial count signals are generated. The 1 st initial count signal is sent to the 1 st column drive unit, causing the 1 st column drive unit to return a count feedback signal. The 3 rd initial count signal is sent to the 3 rd column drive unit, causing the 3 rd column drive unit to return a count feedback signal. And sending the N initial counting signal to the driving unit of the N column to enable the driving unit of the N column to return the counting feedback signal.
In some embodiments, an initial count signal may be sent to any one of the column drive units, causing that column drive unit to return a count feedback signal.
S103, the dimming controller determines parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signal returned by at least one column driving unit.
In some embodiments, the parameters of the backlight partition include the total number of driving units, and the dimming controller determines the parameters of the backlight partition in the backlight unit according to the number of columns of the driving units and the count feedback signal returned by at least one column driving unit, and specifically includes:
And determining the total number of the driving units in the backlight unit according to the column number of the driving units and the counting feedback signal returned by at least one column driving unit.
In some embodiments, the parameters of the backlight partitions include the total number of the backlight partitions, and the dimming controller determines the parameters of the backlight partitions in the backlight unit according to the number of columns of the driving units and the count feedback signal returned by at least one column driving unit, and specifically includes:
and determining the total number of the driving units in the backlight unit according to the column number of the driving units and the counting feedback signal returned by at least one column driving unit.
The total number of backlight partitions is obtained from the total number of driving units and the number of output channels of the driving units.
In some embodiments, the total number of backlight partitions is obtained according to the total number of driving units and the number of output channels of the driving units, and specifically includes: the product of the total number of driving units and the number of output channels of the driving units is taken as the total number of backlight partitions.
In some embodiments, determining the total number of driving units in the backlight unit according to the number of columns of the driving units and the count feedback signal returned by at least one column driving unit specifically includes:
The number of rows of the driving units is determined according to the count feedback signal fed back by at least one column driving unit, and the total number of driving units in the backlight unit is determined according to the number of columns of the driving units and the number of rows of the driving units.
Wherein the product of the number of columns of drive units and the number of rows of drive units is taken as the total number of drive units in the backlight unit.
In some embodiments, determining the number of rows of the driving units according to the count feedback signal fed back by at least one column of the driving units specifically includes:
if the initial count signal is sent to only one column driving unit, the number of the column driving units is calculated based on the count feedback signal returned by the column driving unit, and the number of the column driving units is used as the number of rows of the driving units.
In some embodiments, determining the number of rows of the driving units according to the count feedback signal fed back by at least one column of the driving units specifically includes:
when the counting feedback signals fed back by the multiple column driving units are received, the number of the driving units in each column driving unit returning the counting feedback signals is determined according to the counting feedback signals returned by the column driving units. The number of rows of drive units in the backlight unit is determined based on the number of drive units in each column of drive units that return the count feedback signal.
Wherein when the number of the obtained column driving units is the same, the number of any one column driving unit is obtained as the number of rows of the driving units.
And when the number of the obtained column driving units is different, re-sending an initial counting signal to at least one column driving unit, receiving a new counting feedback signal returned by at least one column driving unit, re-determining the number of the column driving units based on the new counting feedback signal returned by each column driving unit, and when the number of the re-determined column driving units is the same, taking the number of any one re-determined driving unit as the number of rows of the driving units. And reporting a counting error when the number of the redetermined column driving units is different.
For example: and receiving a counting feedback signal returned by the 1 st column driving unit, a counting feedback signal returned by the 2 nd column driving unit, a counting feedback signal returned by the 3 rd column driving unit and a counting feedback signal returned by the 4 th column driving unit.
If the number of driving units in the 1 st column driving unit is 10 based on the counting feedback signal returned by the 1 st column driving unit, the number of driving units in the 2 nd column driving unit is 10 based on the counting feedback signal returned by the 2 nd column driving unit, the number of driving units in the 3 rd column driving unit is 10 based on the counting feedback signal returned by the 3 rd column driving unit, the number of driving units in the 4 th column driving unit is 10 based on the counting feedback signal returned by the 4 th column driving unit, and the number of driving units in the 4 th column driving unit is the same, the number of driving units is 10 as the number of rows of the driving units.
If the number of driving units in the 1 st column driving unit is 9 based on the counting feedback signals returned by the 1 st column driving unit, the number of driving units in the 2 nd column driving unit is 10 based on the counting feedback signals returned by the 2 nd column driving unit, the number of driving units in the 3 rd column driving unit is 10 based on the counting feedback signals returned by the 3 rd column driving unit, the number of driving units in the 4 th column driving unit is 10 based on the counting feedback signals returned by the 4 th column driving unit, that is, the number of the 4 driving units is different, initial counting signals are sent to the 1 st column driving unit, the 2 nd column driving unit, the 3 rd column driving unit and the 4 th column driving unit again.
Receiving the counting feedback signal returned by the 1 st column driving unit, the counting feedback signal returned by the 2 nd column driving unit, the counting feedback signal returned by the 3 rd column driving unit, the counting feedback signal returned by the 4 th column driving unit,
if the number of driving units in the 1 st column driving unit is redetermined to be 10 based on the count feedback signal returned by the 1 st column driving unit, the number of driving units in the 2 nd column driving unit is redetermined to be 10 based on the count feedback signal returned by the 2 nd column driving unit, the number of driving units in the 3 rd column driving unit is redetermined to be 10 based on the count feedback signal returned by the 3 rd column driving unit, the number of driving units in the 4 th column driving unit is redetermined to be 10 based on the count feedback signal returned by the 4 th column driving unit, and the number of driving units in the 4 th column driving unit is the same, the number of driving units is 10 as the number of lines of the driving units.
If the number of the driving units in the 1 st column driving unit is redetermined to be 9 based on the counting feedback signals returned by the 1 st column driving unit, the number of the driving units in the 2 nd column driving unit is redetermined to be 10 based on the counting feedback signals returned by the 2 nd column driving unit, the number of the driving units in the 3 rd column driving unit is redetermined to be 10 based on the counting feedback signals returned by the 3 rd column driving unit, the number of the driving units in the 4 th column driving unit is redetermined to be 10 based on the counting feedback signals returned by the 4 th column driving unit, and the number of the driving units in the 4 th column driving unit is different, reporting a counting error.
In some embodiments, if an initial count signal is sent to the multiple column driving units, the number of the driving units in each column is calculated based on the count feedback signal returned by the driving units in each column, the number of the driving units in each column is counted, and the number of the driving units with the largest counted number is used as the number of rows of the driving units.
For example: and receiving a counting feedback signal returned by the 1 st column driving unit, a counting feedback signal returned by the 2 nd column driving unit, a counting feedback signal returned by the 3 rd column driving unit and a counting feedback signal returned by the 4 th column driving unit.
If the number of driving units in the 1 st column driving unit is determined to be 9 based on the count feedback signal returned by the 1 st column driving unit, the number of driving units in the 2 nd column driving unit is determined to be 10 based on the count feedback signal returned by the 2 nd column driving unit, the number of driving units in the 3 rd column driving unit is determined to be 10 based on the count feedback signal returned by the 3 rd column driving unit, and the number of driving units in the 4 th column driving unit is determined to be 10 based on the count feedback signal returned by the 4 th column driving unit. If the number of 10 is 3 and the number of 9 is 1, 10 lines are used as driving units.
S104, the dimming controller sends the parameters of the backlight partition to the time sequence controller.
S105, the time schedule controller acquires image data, and generates dimming data of each driving unit according to the parameters of the backlight partition and the image data by using a preset dimming algorithm.
In some embodiments, the parameters of the backlight partitions include a total number of driving units, and the timing controller is configured to obtain the total number of backlight partitions according to the total number of driving units and a number of output channels of the driving units, and process the total number of backlight partitions and the image data using a preset dimming algorithm to generate dimming data of each driving unit.
In some embodiments, the parameters of the backlight partitions include a total number of backlight partitions, and the timing controller is configured to process the total number of backlight partitions and the image data using a preset dimming algorithm to generate dimming data of each driving unit.
The image data is sent by the external equipment, and is used for driving the liquid crystal display screen and generating dimming data. The dimming data may be calculated using an existing dimming algorithm, which is not described here.
The driving units in the column driving units generate driving signals based on the corresponding dimming data, and the driving signals control the light emitting units connected with the driving units to emit light to provide backlight light sources.
In the technical scheme, the dimming controller acquires the column number of the driving units in the backlight unit, sends an initial counting signal to at least one column driving unit, and receives a counting feedback signal returned by at least one column driving unit, so that the parameters of the backlight partition in the backlight unit are determined according to the column number of the driving units and the counting feedback signal returned by at least one column driving unit, and the parameters of the backlight partition are sent to the time sequence controller, so that the time sequence controller uses a preset dimming algorithm to generate dimming data of each driving unit according to the parameters of the backlight partition and the image data, and thus the dimming controller can adapt to backlight units of different scales without configuring partition data in the time sequence controller in advance, and improves the debugging efficiency of the time sequence controller.
Some embodiments of the present application provide a method for controlling a backlight unit. The backlight unit comprises a plurality of driving units which are arranged in an array, the driving units in the same column are connected in cascade, the control method is applied to the controller, and the control method comprises the following steps:
s201, the controller acquires the column number of the driving unit in the backlight unit.
This step is already explained in S101, and will not be described again here.
S202, the controller sends an initial counting signal to at least one column driving unit and receives a counting feedback signal returned by the at least one column driving unit.
This step is already explained in S102, and will not be described again here.
S203, the controller determines parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signals returned by at least one column driving unit.
This step is already explained in S103, and will not be described again here.
S204, the controller acquires image data, and generates dimming data of each driving unit according to the parameters of the backlight partition and the image data by using a preset dimming algorithm.
This step is already explained in S105, and will not be described here.
In the technical scheme, the controller acquires the column number of the driving units in the backlight unit, sends an initial counting signal to at least one column driving unit, and receives a counting feedback signal returned by at least one column driving unit, so that parameters of backlight partitions in the backlight unit are determined according to the column number of the driving units and the counting feedback signal returned by at least one column driving unit, and dimming data of each driving unit are generated according to the parameters of the backlight partitions and image data by using a preset dimming algorithm, so that the controller can adapt to backlight units of different scales, partition data do not need to be configured in the controller in advance, and the debugging efficiency of the controller is improved.
For ease of understanding, it should be noted that the controller described below may be the controller shown in fig. 1, or may be the dimming controller shown in fig. 2.
In some implementations, a column driving unit returns a count feedback signal, specifically including: each driving unit checks the initial counting signal when receiving the initial counting signal, returns a counting feedback signal to the controller when the initial counting signal passes the check, and sends the initial counting signal to the next driving unit when determining that the next driving unit exists, so that a plurality of counting feedback signals are returned by one row of driving units.
More specifically, a column driving unit returns a count feedback signal, specifically comprising the steps of:
s301, the 1 st driving unit receives an initial counting signal sent by the controller, checks the initial counting signal, generates a counting feedback signal when the initial counting signal passes the check, and returns the counting feedback signal to the controller. The count feedback signal is not generated when the verification fails. When the 1 st driving unit determines that there is a next driving unit, an initial count signal is transmitted to the 2 nd driving unit. When the 1 st driving unit determines that there is no next driving unit, the transmission of the initial count signal to the next driving unit is stopped.
Wherein, by configuring the check count signal in each driving unit, the check count signal configured in each driving unit is the same. The count feedback signal returned by each drive unit is the same. For example: the verify count signal may be 1010 and the count feedback signal may be 10.
After receiving the initial counting signal, the 1 st driving unit compares the initial counting signal with the checking counting signal, if the initial counting signal is the same as the checking counting signal, the checking is confirmed to pass, and a counting feedback signal is generated. If the two signals are different, the fact that the verification is not passed is determined, and a counting feedback signal is not generated.
More specifically, when it is determined that there is a next driving unit, the 1 st driving unit transmits an initial count signal to the 2 nd driving unit through a data transmission line. When the verification passes, the 1 st driving unit returns a counting feedback signal to the controller through the data transmission line.
S302, the 2 nd driving unit receives the initial counting signal, checks the initial counting signal, generates a counting feedback signal when the initial counting signal passes the check, and returns the counting feedback signal to the controller. The count feedback signal is not generated when the verification fails. When the 2 nd driving unit determines that there is a next driving unit, an initial count signal is transmitted to the 3 rd driving unit. When the 2 nd driving unit determines that there is no next driving unit, the transmission of the initial count signal to the next driving unit is stopped.
Wherein the 2 nd driving unit transmits an initial count signal to the 3 rd driving unit through the data transmission line when it is determined that there is a next driving unit. When the verification passes, the 2 nd driving unit returns a counting feedback signal to the controller through the data transmission line.
S30i, the ith driving unit receives the initial counting signal, checks the initial counting signal, generates a counting feedback signal when the initial counting signal passes the check, and returns the counting feedback signal to the controller. The count feedback signal is not generated when the verification fails. When the ith driving unit determines that there is a next driving unit, an initial count signal is transmitted to the next driving unit. When the ith driving unit determines that there is no next driving unit, the transmission of the initial count signal to the next driving unit is stopped.
Wherein i is a positive integer. When it is determined that there is a next driving unit, the i-th driving unit transmits an initial count signal to the i+1-th driving unit through the data transmission line. When the verification passes, the ith driving unit returns a counting feedback signal to the controller through the data transmission line.
Correspondingly, the controller determines the number of rows of the driving units according to the count feedback signals fed back by at least one column of driving units, and specifically comprises the following steps:
And counting the received counting feedback signals aiming at the counting feedback signals fed back by a column driving unit, and taking the counting result as the row number of the driving units in the column driving unit.
In some embodiments, for a count feedback signal fed back by a column driving unit, counting the received count feedback signal, and taking the counted result as the number of rows of the driving units in the column driving unit, the method specifically includes:
and receiving a counting feedback signal at the current moment, and adding a counting unit to the counting value to obtain an updated counting value.
Judging whether a next counting feedback signal is received within a preset time difference value after the current moment, if not, outputting the updated counting value as the row number of the driving units in the column driving unit, and if the next counting feedback signal is received, continuously adding a counting unit to the counting value to obtain the updated counting value.
The preset time difference value can be fixed or updated in real time. When the preset time difference is fixed, taking the difference between the receiving moments of any two counting feedback signals as the preset time difference, for example: the difference between the receiving time of the 1 st count feedback signal and the receiving time of the 2 nd count feedback signal is taken as a preset time difference.
The counting feedback signals fed back by a column driving unit are counted when the preset time difference value is updated in real time, and the counting result is used as the number of rows of the driving units in the column driving unit, and the counting method specifically comprises the following steps:
and receiving a counting feedback signal at the current moment, and adding a counting unit to the counting value to obtain an updated counting value.
The method comprises the steps of obtaining a difference value between a current time and a receiving time of receiving a last counting feedback signal as a current difference value, obtaining a last difference value average value, updating the last difference value average value by using the current difference value and an updated counting value, and taking the updated difference value average value as a preset time difference value.
Judging whether a next counting feedback signal is received within a preset time difference value after the current moment, if not, outputting the updated counting value as the row number of the driving units in the column driving unit, and if the next counting feedback signal is received, continuously adding a counting unit to the counting value to obtain the updated counting value.
The method for updating the average value of the previous difference value by using the current difference value and the updated count value specifically comprises the following steps: and calculating the product between the average value of the previous difference and the count value before updating to obtain a product result. And calculating the sum of the product result and the current difference value, and dividing the sum of the product result and the current difference value by the updated count value to obtain a preset time difference value. The count value before update and the count value after update differ by one count unit.
More specifically, the controller records the reception timing of each count feedback signal. And calculating the difference value of the receiving moments of two adjacent counting feedback signals to obtain a plurality of moment difference values. And calculating a difference average value among the plurality of time differences, taking the current time as a reference point, judging whether a next counting feedback signal is received within the difference average value time, namely whether the next counting feedback signal is received within the difference average value time period from the current time, if the next counting feedback signal is not received, counting the number of the counting feedback signals which are already received, and taking the counted result as the number of the driving units in the column driving unit.
In the above technical solution, each driving unit checks the initial count signal after receiving the initial count signal transmitted by the previous driving unit or the controller, and generates a count feedback signal after the check is passed, and returns to the controller through the transmission line, and when determining that there is a next driving unit, sends the initial count signal to the next driving unit, so that the next driving unit generates the count feedback signal, and the controller determines the number of driving units in the column driving unit by counting the received count feedback signals.
For ease of understanding, a list of 4 drive units is illustrated here.
As shown in fig. 5A, the 1 st driving unit checks the initial count signal 1010, generates the count feedback signal 10 when the check passes, returns the count feedback signal 10 to the controller through the data transmission line 201, and transmits the initial count signal 1010 to the 2 nd driving unit through the data transmission line 201.
As shown in fig. 5B, the 2 nd driving unit checks the initial count signal 1010, generates the count feedback signal 10 when the check passes, returns the count feedback signal 10 to the controller through the data transmission line 201, and transmits the initial count signal 1010 to the 3 rd driving unit through the data transmission line 201.
As shown in fig. 5C, the 3 rd driving unit checks the initial count signal 1010, generates the count feedback signal 10 when the check passes, returns the count feedback signal 10 to the controller through the data transmission line 201, and transmits the initial count signal 1010 to the 4 th driving unit through the data transmission line 201.
As shown in fig. 5D, the 4 th driving unit checks the initial count signal 1010, generates the count feedback signal 10 when the check passes, and returns the count feedback signal 10 to the controller through the data transmission line 201.
As shown in fig. 5E, the time when the controller receives the 1 st count feedback signal is the receiving time t1, the time when the controller receives the 2 nd count feedback signal is the receiving time t2, and the count value is set to 2, and the difference Δt1 between the receiving time t1 and the receiving time t2 is calculated.
And judging whether the 3 rd counting feedback signal is received within the time delta t1 from the receiving time t2, and if the 3 rd counting feedback signal is received, updating the counting value to be 3. The reception time t3 of the received 3 rd count feedback signal is recorded. The difference Deltat 2 between the reception time t2 and the reception time t3 is calculated, and the difference Deltat 1 and the difference average E Deltat 1 of the difference Deltat 2 are calculated.
And judging whether the 4 th counting feedback signal is received within the time of the difference average value E delta t1 from the receiving time t3, if the 4 th counting feedback signal is received, updating the count value 4, and recording the receiving time t4 of the received 4 th counting feedback signal. The difference Deltat 3 between the reception time t3 and the reception time t4 is calculated, and the difference Deltat 1, the difference Deltat 2 and the average E Deltat 2 of the difference Deltat 3 are calculated.
Judging whether the 5 th counting feedback signal is received within the time of the difference average value E delta t2 from the receiving time t4, stopping counting if the 5 th counting feedback signal is not received, and outputting the number of the driving units in the column driving unit as 4.
In some embodiments, a column driving unit returns a count feedback signal, specifically comprising the steps of:
s301, the 1 st driving unit receives the initial counting signal, generates the 1 st coding signal, and outputs the 1 st intermediate signal after superimposing the 1 st coding signal on the initial counting signal, and transmits the 1 st intermediate signal to the 2 nd driving unit, and jumps to S302.
The initial counting signal comprises a plurality of sub-signals, the 1 st coding signal is overlapped on the 1 st sub-signal, and the 1 st sub-signal and the rest sub-signals overlapped with the 1 st coding signal are used as 1 st intermediate signals.
S302, the 2 nd driving unit receives the 1 st intermediate signal, generates the 1 st encoded signal, superimposes the 2 nd encoded signal on the 1 st intermediate signal, outputs the 2 nd intermediate signal, determines whether a driving unit of the next stage exists, if yes, enters S3021, otherwise, enters S3022.
Wherein, the 2 nd code signal is overlapped on the 2 nd sub-signal, and the 1 st sub-signal overlapped with the 1 st code signal, the 2 nd sub-signal overlapped with the 2 nd code signal and the rest sub-signals are used as the 2 nd intermediate signal.
S3021, when it is determined that there is a driving unit of the next stage, transmitting the 2 nd intermediate signal to the 3 rd driving unit, and jumping to S303.
S3022, when it is determined that there is no driving unit of the next stage, the 2 nd intermediate signal is returned as the count feedback signal.
The 2 nd driving unit returns the counting feedback signal to the 1 st driving unit, and the 1 st driving unit returns the counting feedback signal to the controller.
S30i, the ith driving unit receives the (i-1) th intermediate signal, generates the ith encoded signal, superimposes the ith encoded signal on the (i-1) th intermediate signal, outputs the ith intermediate signal, determines whether a driving unit of the next stage exists, if yes, enters S30i1, otherwise, enters S30i2. Wherein i is a positive integer.
The ith sub-signal is superimposed on the ith sub-signal, and the ith sub-signal, in which the 1 st sub-signal of the 1 st encoded signal is superimposed, the 2 nd sub-signal of the 2 nd encoded signal is superimposed, and the … … th sub-signal of the ith encoded signal and the remaining sub-signals are superimposed as the ith intermediate signal.
And S30i1, transmitting the ith intermediate signal to the (i+1) th driving unit when the driving unit of the next stage is determined.
S30i2, when no driving unit of the next stage is determined, returning the ith intermediate signal as a counting feedback signal.
The ith driving unit returns the counting feedback signal to the (i-1) th driving unit, the (i-1) th driving unit returns the counting feedback signal to the (i-2) th driving unit, and so on until the 1 st driving unit returns the counting feedback signal to the controller.
Correspondingly, the controller determines the number of rows of the driving units according to the count feedback signals fed back by at least one column of driving units, and specifically comprises the following steps:
for the counting feedback signals fed back by a column driving unit, the counting feedback signals are segmented according to the length of the decoding sub-signals, and a plurality of feedback sub-signals are obtained.
Comparing the feedback sub-signal with the decoding sub-signal for each feedback sub-signal, and if the feedback sub-signal is the same with the decoding sub-signal, increasing the count value by one unit; until all feedback sub-signals are traversed, the final count value is taken as the row number of the driving units in the column driving unit. The decoded sub-signal is identical to the sub-signal in the initial count signal.
In the above technical solution, the number of driving units is encoded in the output signal of the next driving unit by superimposing the encoded signal of the next driving unit on the output signal of the previous driving unit, and after the last driving unit finishes encoding, the signal is returned to the controller, so that the controller decodes and counts the count feedback signal, and the number of driving units in the column driving unit is obtained.
For ease of understanding, a list of 4 drive units is illustrated here.
As shown in fig. 6, the initial count signal includes 4 sub-signals, each of which is the same, 101010. After the 1 st driving unit receives the initial count signal, the 1 st sub-signal of the superimposed encoded signal is changed to 111010 by superimposing the encoded signal 111000 on the 1 st sub-signal, and the 1 st sub-signal 111010 and the 2 nd sub-signal 101010 to the 4 th sub-signal 101010 of the superimposed encoded signal are outputted as the 1 st intermediate signal.
After receiving the initial count signal, the 2 nd driving unit superimposes the encoded signal 111000 on the 2 nd sub-signal, and the 2 nd sub-signal of the superimposed encoded signal becomes 111010, and outputs the 1 st sub-signal 111010 of the superimposed encoded signal, the 2 nd sub-signal 111010 of the superimposed encoded signal, and the 3 rd sub-signal 101010 to the 4 th sub-signal 101010 as 2 nd intermediate signals.
After receiving the initial count signal, the 3 rd driving unit superimposes the encoded signal 111000 on the 3 rd sub-signal, and the 3 rd sub-signal of the superimposed encoded signal becomes 111010, and outputs the 1 st sub-signal 111010 of the superimposed encoded signal, the 2 nd sub-signal 111010 of the superimposed encoded signal, the 3 rd sub-signal 111010 of the superimposed encoded signal, and the 4 th sub-signal 101010 of the superimposed encoded signal as the 3 rd intermediate signal.
After receiving the initial count signal, the 4 th driving unit superimposes the encoded signal 111000 on the 4 th sub-signal, and the 4 th sub-signal of the superimposed encoded signal becomes 111010, and uses the 1 st sub-signal 111010 of the superimposed encoded signal, the 2 nd sub-signal 111010 of the superimposed encoded signal, the 3 rd sub-signal 111010 of the superimposed encoded signal, and the 4 th sub-signal 111010 of the superimposed encoded signal as 4 th intermediate signals, and returns the 4 th intermediate signals as count feedback signals, and returns to the controller via the transmission signal line.
The controller segments the count feedback signal into a plurality of sub-signals according to the length of the decoded sub-signals, compares the locally stored decoded sub-signal 101010 with the sub-signals for each sub-signal, if the decoded sub-signals are the same, indicates that no encoded signals are superimposed, if the decoded sub-signals are different, indicates that the encoded signals are superimposed, adds a count value to one count unit until all the sub-signals are traversed, and outputs the final count value as the number of driving units in the column driving unit.
Some embodiments of the present application provide a method for controlling a backlight unit. The backlight unit comprises a plurality of driving units which are arranged in an array, the driving units in the same column are connected in cascade, the control method is applied to the dimming controller, and the control method comprises the following steps:
S401, the dimming controller acquires the column number of the driving unit in the backlight unit.
The number of columns of the driving unit is used as a preset parameter, and the controller can receive the number of columns of the driving unit sent by the external device.
S402, the dimming controller sends an initial counting signal to at least one column driving unit and receives a counting feedback signal returned by the at least one column driving unit.
S403, the dimming controller determines parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signal returned by at least one column driving unit.
S404, the dimming controller sends the parameters of the backlight partition to the time schedule controller.
S405, the time schedule controller acquires image data, and generates dimming data of each column driving unit according to the parameters of the backlight partition and the image data by using a preset dimming algorithm.
And S406, the dimming controller sends corresponding dimming data to each column driving unit.
The dimming controller receives the dimming data sent by the timing controller, combines the dimming data of the driving units in the same column, and generates the dimming data of the driving units in each column, so that the dimming data is convenient to transmit in the corresponding column.
In the above technical solution, the dimming controller may receive the count feedback signal returned by each column driving unit by sending the initial count signal, determine the parameter of the backlight partition based on the count feedback signal and the column number of the driving unit, and generate the dimming data of each column driving unit based on the parameter of the backlight partition and the image data, so as to facilitate the dimming data to be transmitted in the corresponding column.
Fig. 7 is a schematic structural diagram of a dimming controller provided in some embodiments of the present application, as shown in fig. 7, where a backlight unit includes a plurality of driving units arranged in an array, the driving units in the same column are connected in cascade, and the dimming controller includes a first transceiver, a storage module, a second transceiver and a processing module;
the first transceiver receives the column number of the driving unit in the backlight unit and stores the column number of the driving unit in the storage module;
the second transceiver transmits an initial counting signal to at least one column driving unit and receives a counting feedback signal returned by the at least one column driving unit; and storing the count feedback signal in a memory module;
the processing module determines parameters of backlight partitions in the backlight unit according to the column number of the driving units and the counting feedback signals returned by at least one column driving unit;
the first transceiver transmits parameters for determining backlight partitions in the backlight units to the timing controller, so that the timing controller processes the total number of the driving units and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
More specifically, the dimming controller is connected to the 1 st driving unit of a column driving unit through one data transmission line, the dimming controller determines the number of the data transmission lines, and generates N initial count signals according to the number of the data transmission lines. N is the number of data transmission lines.
For each column driving unit, the dimming controller sends an initial counting signal to each data transmission line, the initial counting signal is transmitted in the column driving unit step by step, the number of longitudinal driving units is counted, and the number of longitudinal partitions is calculated according to the number of longitudinal partitions controlled by each driving unit.
If there are N drive units in the longitudinal direction, each drive unit controls the number of zones by 2 in the longitudinal direction, the number of zones in the longitudinal direction is 2N. Each driving unit transversely controls 2 partitions, and the number of the transverse partitions is 2N when the data transmission lines are N. After the number of the partitions in the transverse direction and the longitudinal direction is calculated, the total number of the partitions is 2N multiplied by 2N, the total number of the partitions is sent to a time sequence controller, the time sequence controller generates dimming data according to the total number of the partitions, the dimming data of each driving unit has 81 bits, the duty ratio of backlight driving signals of each output channel of the driving unit is regulated and controlled, and the current is controlled.
The data bit of a driving unit is 81bit data, which comprises 8bit preamble command bit, 8bit address bit, 64bit data bit and 1bit end command bit. Each partition occupies 16bit data bits to control the current output of the drive unit. According to the calculated partition number, if there are 10 driving units in the vertical direction and 10 driving units in the horizontal direction, the total number of data bits is 81x 100=8100 bits, and control data bits are sent to the backlight driving chip through 201, so that the driving units output current to drive the light emitting units.
In some embodiments, the dimming controller is connected to an external device, the external device transmits the number of data transmission lines to the dimming controller and stores the number of data transmission lines in the memory module, the second transceiver transmits an initial count signal to at least one data transmission line, detects the number of driving units per column through the initial count signal, and stores the number of driving units per column in the memory module.
The above-described embodiments refer to the concept that both high and low levels are opposite (i.e., the voltage value of the high level is higher than the voltage value of the low level corresponding thereto), and are not limited to the specific voltage value of the high level or the specific voltage value of the low level. The high levels applied to the different signal lines in this embodiment are not limited to being equal, nor are the high levels applied to the specific signal lines at different stages. It will be appreciated by those skilled in the art that the values of the respective high and low levels may be set by themselves, depending on process nodes, speed requirements, reliability requirements, etc.
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 (10)
1. The control method of the backlight unit is characterized in that the backlight unit comprises a plurality of driving units which are arranged in an array, the driving units in the same column are connected in cascade, the control method is applied to a dimming controller, and the control method comprises the following steps:
acquiring the column number of a driving unit in the backlight unit;
sending an initial counting signal to at least one row of driving units and receiving a counting feedback signal returned by at least one row of driving units;
determining parameters of backlight partitions in the backlight unit according to the column number of the driving unit and at least one column of counting feedback signals returned by the driving unit;
and sending the parameters of the backlight partition to a time sequence controller, wherein the time sequence controller is used for processing the parameters of the backlight partition and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
2. The control method according to claim 1, wherein determining the parameters of the backlight partitions in the backlight unit according to the number of columns of the driving unit and the count feedback signal returned by at least one column of the driving unit, specifically comprises:
Determining the number of rows of the driving units in the backlight unit according to at least one row of counting feedback signals fed back by the driving units;
and determining parameters of backlight partitions in the backlight unit according to the column number of the driving unit and the row number of the driving unit.
3. The control method according to claim 2, wherein determining the number of rows of the driving units in the backlight unit according to the count feedback signal fed back by at least one column of the driving units, specifically comprises:
counting the received counting feedback signals aiming at a row of counting feedback signals fed back by the driving units, and taking the counting result as the row number of the driving units in the row driving units;
each driving unit checks the initial counting signal when receiving the initial counting signal, returns a counting feedback signal to the dimming controller when the initial counting signal passes the check, and sends the initial counting signal to the next driving unit.
4. A control method according to claim 3, wherein counting the received count feedback signals for a row of the count feedback signals fed back by the driving units, and using the counted result as the number of rows of the driving units in the row driving unit, specifically comprising:
Receiving a counting feedback signal at the current moment, and adding a counting unit to the counting value to obtain an updated counting value;
judging whether a next counting feedback signal is received within a preset time difference value from the current moment, and if not, outputting the updated counting value as the row number of the driving units in the column driving unit.
5. The control method according to claim 4, wherein a count feedback signal is received at the present time, and a count unit is added to the count value to obtain an updated count value, the method further comprising;
and acquiring a current difference value between the current time and the receiving time of the last counting feedback signal, acquiring a last difference value average value, updating the last difference value average value by using the current difference value and the updated counting value, and taking the updated difference value average value as the preset time difference value.
6. The control method according to claim 2, wherein determining the number of rows of the driving units in the backlight unit according to the count feedback signal fed back by at least one column of the driving units, specifically comprises:
for a row of counting feedback signals fed back by the driving unit, segmenting the counting feedback signals according to the length of decoding sub-signals to obtain a plurality of feedback sub-signals;
Comparing the feedback sub-signal with the decoding sub-signal for each feedback sub-signal, and if the feedback sub-signal is the same, increasing the count value by one unit; until all feedback sub-signals are traversed, the final count value is taken as the row number of the driving units in the column driving unit.
7. The control method according to claim 2, wherein determining the number of rows of the driving units in the backlight unit according to the count feedback signal fed back by at least one column of the driving units, specifically comprises:
when counting feedback signals fed back by a plurality of columns of driving units are received, determining the number of driving units in each column of driving units which return the counting feedback signals according to the counting feedback signals returned by the column driving units;
the number of rows of drive units in the backlight unit is determined based on the number of drive units in each column of drive units that return the count feedback signal.
8. The control method of the backlight unit is characterized in that the backlight unit comprises a plurality of driving units which are arranged in an array, the driving units in the same column are connected in cascade, the control method is applied to a controller, and the control method comprises the following steps:
acquiring the column number of a driving unit in the backlight unit;
Sending an initial counting signal to at least one row of driving units and receiving a counting feedback signal returned by at least one row of driving units;
determining parameters of backlight partitions in the backlight unit according to the column number of the driving unit and at least one column of counting feedback signals returned by the driving unit;
and acquiring image data, and processing the parameters of the backlight partition and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
9. The dimming controller is characterized by comprising a plurality of driving units which are arranged in an array, wherein the driving units in the same column are connected in cascade, and the dimming controller comprises a first transceiver, a storage module, an initial counting signal module, a second transceiver and a processing module;
the first transceiver receives the column number of the driving unit in the backlight unit and stores the column number of the driving unit in the storage module;
the second transceiver sends an initial counting signal to at least one row of the driving units and receives a counting feedback signal returned by at least one row of the driving units; and storing the count feedback signal in the memory module;
The processing module determines parameters of backlight partitions in the backlight unit according to the column number of the driving unit and at least one column of counting feedback signals returned by the driving unit;
the first transceiver sends the parameters of the backlight partition to a time schedule controller, and the time schedule controller is used for processing the parameters of the backlight partition and the image data by using a preset dimming algorithm to generate dimming data of each driving unit.
10. A display device comprising the dimming controller, the timing controller, the backlight unit, and the liquid crystal panel according to claim 9.
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