CN118824199A - Backlight unit control method and display device - Google Patents

Abstract

The present application provides a control method and display device for a backlight unit, wherein a controller receives the address and a first feedback instruction of a target backlight driver sent by a first-level target backlight driver through a data line, wherein the target backlight driver transmits the address and the first feedback instruction of the target backlight driver to the controller when the target backlight driver is detected to be abnormal; when the first feedback instruction indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver; the controller receives the abnormal information of the target backlight driver fed back by the target backlight driver through the signal line. The solution of the present application does not need to feed back all the working information of the backlight driver to the controller, thus reducing the data processing amount and processing complexity of the controller, and since the abnormal information is fed back during part of the time of occupying the signal line, the transmission speed of the data transmitted to the backlight driver can be increased.

Description

Backlight unit control method and display device

Technical Field

The present application relates to the field of display, and in particular to a control method of a backlight unit and a display device.

Background Art

At present, backlight drivers mainly use single-line transmission or dual-line transmission, and multi-line transmission can also be used. Regardless of single-line transmission, dual-line transmission or multi-line transmission, it is necessary to continuously transmit the working status of all backlight driver chips, and it is necessary to continuously transmit monitoring signals every frame.

This results in a very large amount of data processing, and since all backlight driver chips are read back continuously for each frame, a lot of time is taken up, affecting the transmission speed of the data transmitted to the backlight driver.

Summary of the invention

The present application provides a control method for a backlight unit and a display device, which reduce the amount of data processing and improve the data transmission speed.

In a first aspect, the present application provides a control method for a backlight unit, wherein the backlight unit includes a plurality of backlight drivers, wherein the backlight drivers are connected to a controller via data lines and signal lines, and the method is applicable to the controller, and the method includes:

receiving the address and the first return instruction of the target backlight driver sent by the target backlight driver through the data line; when the target backlight driver detects that the target backlight driver is abnormal, the target backlight driver transmits the address and the first return instruction of the target backlight driver to the controller;

When the first feedback instruction indicates that abnormal information needs to be fed back, the controller exclusively occupies the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver; the second feedback instruction is used to instruct the target backlight driver to feed back abnormal information of the target backlight driver;

The abnormal information of the target backlight driver is received and transmitted back by the target backlight driver through the signal line.

In some embodiments, adjacent backlight drivers in the same column are connected via the data line and the signal line, and the first-level backlight driver in each column is connected to the controller via the data line and the signal line, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit.

In some embodiments, adjacent backlight drivers in the same column are connected via the data line, and the first-stage backlight driver of each column is connected to the controller via the data line;

Each of the backlight drivers is connected to the controller via the signal line.

In some embodiments, sending a second feedback instruction to the target backlight driver according to the address of the target backlight driver specifically includes:

sending a second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver, and when the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver;

Or, a second feedback instruction is sent to the first-level backlight driver through the signal line according to the address of the target backlight driver. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver transmits the second feedback instruction backward in sequence through the signal line until it is transmitted to the target backlight driver.

In some embodiments, sending a second feedback instruction to the target backlight driver according to the address of the target backlight driver specifically includes:

sending a second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver, and when the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver;

Or, sending a second feedback instruction to the target backlight driver through the signal line according to the address of the target backlight driver.

In some embodiments, the number of the target backlight drivers is multiple;

The sending a second return instruction to the target backlight driver according to the address of the target backlight driver specifically includes:

A second feedback instruction is sent to the first-level backlight driver via the data line or the signal line, and the second feedback instruction includes the address of each of the target backlight drivers, so that each of the target backlight drivers recognizes that when the second feedback instruction carries the address of the corresponding target backlight driver, abnormal information of the corresponding target backlight driver is fed back.

In some embodiments, the number of the target backlight drivers is multiple;

The sending a second return instruction to the target backlight driver according to the address of the target backlight driver specifically includes:

Sending a second feedback instruction to the first-level backlight driver through the data line, wherein the second feedback instruction includes the address of each of the target backlight drivers, so that each of the target backlight drivers recognizes that when the second feedback instruction carries the address of the corresponding target backlight driver, it feedbacks abnormal information of the corresponding target backlight driver;

Or, a second feedback instruction is sent to each of the target backlight drivers through the signal line according to the address of the target backlight driver.

In some embodiments, when the first feedback instruction indicates that abnormal information needs to be fed back, the controller exclusively occupies the signal line and sends a second feedback instruction to the target backlight driver, specifically including:

When the first feedback instruction indicates that abnormal information needs to be fed back, the controller determines whether the signal line is occupied;

If the signal line is occupied, comparing the priority of the current transmission signal of the signal line with the abnormal information of the target backlight driver;

When the priority of the current transmission signal is higher than the priority of the abnormal information of the target backlight driver, after the current transmission signal is transmitted, sending the second return instruction to the target backlight driver;

When the priority of the current transmission signal of the signal line is lower than the priority of the abnormal information of the target backlight driver, interrupting the transmission of the current transmission signal and sending the return instruction to the target backlight driver;

If the signal line is not occupied, a second feedback instruction is sent to the target backlight driver.

In some embodiments, after receiving the abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line, the method further includes:

releasing the signal line, and sending a control instruction to the target backlight driver via the data line;

or, after sending the control instruction to the target backlight driver via the signal line, releasing the signal line;

The control instruction is generated according to the abnormal information of the target backlight driver.

In some embodiments, after receiving the abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line, the method further includes:

When there are multiple target backlight drivers, corresponding control instructions are sent to each target backlight driver in turn according to the abnormality priority of each target backlight driver, and the control instructions corresponding to each target backlight driver are generated according to the abnormality information of each target backlight driver.

In a second aspect, the present application provides a display device, comprising: a backlight unit and a controller, wherein the backlight unit comprises a plurality of backlight drivers, and the backlight drivers are connected to the controller via data lines and signal lines;

The target backlight driver transmits the address of the target backlight driver and the first return instruction to the controller when the target backlight driver is detected to be abnormal;

When the first feedback instruction indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver;

After receiving the second feedback instruction, the target backlight driver feeds back the abnormal information of the target backlight driver to the controller through the signal line.

In some embodiments, adjacent backlight drivers in the same column are connected via the data line and the signal line, and the first-level backlight driver in each column is connected to the controller via the data line and the signal line, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit.

In some embodiments, adjacent backlight drivers in the same column are connected via the data line, and the first-stage backlight driver of each column is connected to the controller via the data line;

Each of the backlight drivers is connected to the controller via the signal line.

The control method and display device of the backlight unit provided by the present application, the backlight unit includes a plurality of backlight drivers, the backlight drivers are connected to the controller through data lines and signal lines, the controller receives the address of the target backlight driver and the first return instruction sent by the target backlight driver through the data line, wherein the target backlight driver transmits the address of the target backlight driver and the first return instruction to the controller when the target backlight driver is monitored to have an abnormality; when the first return instruction indicates that the abnormal information needs to be returned, the controller monopolizes the signal line, and sends a second return instruction to the target backlight driver according to the address of the target backlight driver, the second return instruction is used to instruct the target backlight driver to return the abnormal information of the target backlight driver; then, the controller receives the abnormal information of the target backlight driver returned by the target backlight driver through the signal line. The scheme of the present application does not need to return all the working information of the backlight driver to the controller, which reduces the data processing amount and processing complexity of the controller, and because the abnormal information is returned by occupying part of the signal line, the transmission speed of the data transmitted to the backlight driver can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of a backlight unit provided in one embodiment of the present application;

FIG2 is a schematic flow chart of a method for controlling a backlight unit according to an embodiment of the present application;

FIG3 is a schematic flow chart of a method for controlling a backlight unit according to another embodiment of the present application;

FIG4 is a schematic diagram of a data communication protocol provided in an embodiment of the present application;

FIG5 is a schematic diagram of a signal communication protocol provided by an embodiment of the present application;

FIG6 is a schematic diagram of a data communication protocol provided in another embodiment of the present application;

FIG7 is a schematic diagram of a display device provided by an embodiment of the present application;

FIG8 is a schematic diagram of a display device provided by an embodiment of the present application;

FIG9 is a schematic diagram of another display device provided by an embodiment of the present application;

FIG10 is a schematic diagram of a display device provided by another embodiment of the present application;

FIG11 is a schematic diagram of a display device provided by yet another embodiment of the present application;

FIG12 is a schematic diagram of a display device provided by yet another embodiment of the present application;

FIG13 is a schematic diagram of a display device provided by an embodiment of the present application;

FIG. 14 is a pin diagram of a backlight driver provided in an embodiment of the present application.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

In the display field, LED (light-emitting diode) backlight driving circuit plays an important role. With the rapid development of high-definition and large-screen display technology, higher requirements are placed on the performance and accuracy of LED backlight driving circuit.

The LED backlight driving circuit includes a backlight driving chip (also called a backlight driver). The backlight driving chip is capable of feedback and intelligent monitoring. The feedback and intelligent monitoring of the backlight driving chip can be related to the display effect of the device and can also affect the performance and stability of the device.

The following is an analysis of the importance of feedback and intelligent monitoring of backlight driver chips:

Optimize display effects: The feedback mechanism of the backlight driver chip can adjust the brightness and color of the backlight in real time, ensuring that the display screen can present the best visual effect under various ambient light conditions. Intelligent monitoring can detect the working status of the backlight driver chip in real time to ensure the stability and consistency of the display effect.

Improve energy efficiency: Through intelligent monitoring, the working state of the backlight driver chip can be adjusted according to actual needs to avoid unnecessary waste, and this dynamic energy management helps to extend the battery life of the device and improve energy efficiency. For example, in the case of dim ambient light, the display system can reduce the brightness of the backlight unit to save energy.

Enhanced equipment stability: Feedback and intelligent monitoring of backlight driver chips help to detect and deal with potential problems in a timely manner, help reduce the failure rate of equipment, and improve equipment reliability and stability. For example, when the backlight driver chip fails or performance degrades, the intelligent monitoring system can issue an alarm to remind users or maintenance personnel to take timely measures to repair or replace it.

Improve user experience: By optimizing display effects and improving energy efficiency, feedback and intelligent monitoring of backlight driver chips help improve the overall user experience. Users can get clearer and more realistic display effects without worrying about performance degradation or failure of the device during use.

In summary, the feedback and intelligent monitoring of backlight driver chips are of great significance in electronic devices. They can not only improve the display effect and energy efficiency of the device, but also enhance the stability of the device and user experience.

Currently, backlight driving mainly adopts single-line transmission or dual-line transmission, and may also adopt multi-line transmission.

Single-line transmission uses a data line time-division multiplexing method. Specifically, within one frame, the controller transmits the control signal and the brightness signal to the backlight driver chip, and the backlight driver chip controls the LED to display the brightness. After that, the backlight driver chip transmits part or all of the monitoring signal back to the controller. The control signal is used to control the backlight driver chip to start the target function, which may include a delay function, an open circuit function, a disconnection function, etc.

Two-line or multi-line transmission uses a separate return line. Usually, within one frame, the controller transmits the control signal and brightness signal to the backlight driver chip, so that the backlight driver chip can control the LED to display brightness. After that, the backlight driver chip returns part or all of the monitoring signals of each frame to the controller through a dedicated return line, or the backlight driver chip can also return the monitoring signal of the previous frame to the controller at the beginning of each frame.

Therefore, in the above scheme, it is necessary to continuously transmit the working status of all backlight driver chips, and it is necessary to continuously transmit the monitoring signal every frame. The data processing volume is very large, and since all backlight driver chips are continuously read back every frame, it takes a lot of time, which affects the transmission speed of the data transmitted to the backlight driver and the number of connections of the backlight driver. There will also be problems such as large controller calculation volume, complex processing, and high cost.

To this end, the present application provides a control method for a backlight unit. When a first feedback instruction of a target backlight driver indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver, so that the target backlight driver feeds back the abnormal information of the target backlight driver through the signal line. Therefore, when an abnormality exists in the target backlight driver and the abnormal information of the target backlight driver is fed back, the abnormal information of the target backlight driver is fed back to the controller, and there is no need to feed back all the working information of the backlight driver to the controller, thereby reducing the data processing amount and processing complexity of the controller. Moreover, since the abnormal information is fed back through part of the time when the signal line is occupied by the signal, the transmission speed of the data transmitted to the backlight driver can be improved.

The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

In order to facilitate understanding of the solution of the present application, the backlight unit provided in the embodiment of the present application is first described. As shown in FIG1 , the backlight unit provided in the embodiment includes:

Multiple columns of backlight drivers 10, the backlight drivers 10 are connected to the controller 30 via data lines (data) 201 and signal (single) lines 202. For example, multiple backlight drivers 10 arranged in an array and one or more light-emitting units 20 connected to each backlight driver 10 may be included. In the same column of backlight drivers, adjacent backlight drivers are connected via data lines 201 and signal lines 202, and the first-level backlight driver of each column is connected to the controller 30 via data lines 201 and signal lines 202. The light-emitting unit 20 may include, for example, one or more light-emitting diodes (LEDs).

For example, the 1st row backlight driver serves as the first-level backlight driver, the 2nd row backlight driver serves as the second-level backlight driver, and so on. The M-1th row backlight driver serves as the M-1th-level backlight driver, and the Mth row backlight driver serves as the Mth-level backlight driver.

Taking the first column backlight driver as an example, the first-level backlight driver is connected to the second-level backlight driver through data lines and signal lines, the second-level backlight driver is connected to the third-level backlight driver through data lines and signal lines, and so on. The (M-1)-level backlight driver is connected to the M-level backlight driver through data lines and signal lines.

Next, the control method of the backlight unit provided in the embodiment of the present application is described, and the control method of the backlight unit is applied to a controller, and the controller can be any controller in Figures 7 to 10, and is not limited here. Figures 7 to 10 are schematic diagrams of the structure of the display device provided in some embodiments of the present application.

FIG2 is a schematic flow chart of a control method of a backlight unit provided in an embodiment of the present application. As shown in FIG2 , the control method of a backlight unit provided in an embodiment of the present application includes:

S101 . A controller receives an address of a target backlight driver and a first return instruction sent by a target backlight driver via a data line.

When the target backlight driver is detected to be abnormal, the target backlight driver transmits the address of the target backlight driver and the first return instruction to the controller. The target backlight driver can be any backlight driver in the backlight unit, and the number of target backlight drivers can be one or more, for example, two or three.

For example, the abnormality of the target backlight driver may include an abnormality of the target backlight driver itself, an abnormality of the data line connected to the target backlight driver, an abnormality of the light-emitting unit connected to the target backlight driver, etc. The abnormality of the target backlight driver itself may include a failure of the target backlight driver itself, an abnormal temperature of the target backlight driver, etc. The abnormality of the data line connected to the target backlight driver may include an open circuit, a short circuit, etc. of the data line connected to the target backlight driver. The abnormality of the light-emitting unit connected to the target backlight driver may include an open circuit, a short circuit, etc. of the light-emitting unit connected to the target backlight driver.

In this embodiment, within any frame period, each backlight driver can detect whether the backlight driver itself is abnormal, whether the data line connected to the backlight driver is abnormal, whether the light-emitting unit connected to the backlight driver is abnormal, etc.

In practical applications, the fault status of each backlight driver can be set in advance, which abnormalities need to be fed back and which abnormalities do not need to be fed back. For example, when a channel short circuit (SHORT) occurs, no feedback is required, and the channel can be closed. Specifically, each backlight driver is pre-set with a corresponding first feedback instruction. For example, each abnormality of each backlight driver has a corresponding first feedback instruction. The first feedback instruction is used to indicate that the abnormal information needs to be fed back or does not need to be fed back. For example, when the first feedback instruction is 1, the abnormal information needs to be fed back, and when the first feedback instruction is 0, the abnormal information does not need to be fed back.

In some embodiments, adjacent backlight drivers in the same column are connected via data lines and signal lines, and the first-level backlight driver in each column is connected to the controller via data lines and signal lines, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit.

For example, in the direction away from the controller, the backlight drivers of each column are sequentially referred to as the first-level backlight driver to the N-th-level backlight driver, where N is an integer greater than 1. Accordingly, the controller can receive the address and the first feedback instruction sent by the first-level backlight driver through the data line. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the target backlight driver transmits the address and the first feedback instruction of the target backlight driver to the first-level backlight driver in forward sequence through the data line. Among them, the forward sequential transmission refers to the transmission in the direction close to the controller, and the backward sequential transmission refers to the transmission in the direction away from the controller.

For example, the target backlight driver is the M-th level backlight driver, M is an integer greater than 0 and less than N, and N is the total number of backlight drivers. When the M-th level backlight driver detects that the M-th level backlight driver is abnormal, it transmits the address and the first feedback instruction of the M-th level backlight driver to the M-1-th level backlight driver in the same column through the data line, and the M-1-th level backlight driver transmits the address and the first feedback instruction of the M-th level backlight driver to the M-2-th level backlight driver in the same column through the data line, and so on, until the address and the first feedback instruction of the M-th level backlight driver are transmitted to the first-level backlight driver in the same column. The first-level backlight driver can send the address and the first feedback instruction of the M-th level backlight driver to the controller.

S102: When the first feedback instruction indicates that abnormal information needs to be fed back, the controller exclusively occupies the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver.

The second feedback instruction is used to instruct the target backlight driver to feedback abnormal information of the target backlight driver.

It should be noted that the controller exclusively occupies the signal line means that the controller controls the signal line to be used only for transmitting abnormal information of the target backlight driver during a preset time.

In some embodiments, adjacent backlight drivers in the same column are connected via data lines and signal lines, and the first-level backlight driver in each column is connected to the controller via data lines and signal lines, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit.

Accordingly, the controller may send the second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver. The controller may also send the second feedback instruction to the first-level backlight driver through the signal line according to the address of the target backlight driver. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the signal line until it is transmitted to the target backlight driver.

In some examples, there are multiple target backlight drivers. For example, a second return instruction can be sent to the first-level backlight driver via a data line, and the second return instruction includes the address of each target backlight driver, so that each target backlight driver recognizes that when the second return instruction carries the address of the corresponding target backlight driver, the abnormal information of the corresponding target backlight driver is returned. For example, a second return instruction can also be sent to the first-level backlight driver via a signal line, and the second return instruction includes the address of each target backlight driver, so that each target backlight driver recognizes that when the second return instruction carries the address of the corresponding backlight driver, the abnormal information of the corresponding target backlight driver is returned.

In other embodiments, adjacent backlight drivers in the same column are connected via data lines, and the first-stage backlight driver in each column is connected to the controller via the data line; and each backlight driver is connected to the controller via a signal line.

Accordingly, the controller can send the second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver. The controller can also send the second feedback instruction to the target backlight driver through the signal line according to the address of the target backlight driver.

In some examples, there are multiple target backlight drivers. For example, a second return instruction can be sent to the first-level backlight driver through a data line, and the second return instruction includes the address of each target backlight driver, so that each target backlight driver recognizes that when the second return instruction carries the address of the corresponding target backlight driver, the abnormal information of the corresponding target backlight driver is returned. For example, the second return instruction can also be sent to each target backlight driver through a signal line according to the address of the target backlight driver.

In some examples, when the first return instruction indicates that abnormal information needs to be returned, it is determined whether the signal line is occupied. If the signal line is occupied, compare the priority of the current transmission signal of the signal line with the abnormal information of the target backlight driver; when the priority of the current transmission signal is higher than the priority of the abnormal information of the target backlight driver, after the current transmission signal is transmitted, send a second return instruction to the target backlight driver so that the target backlight driver returns the abnormal information of the target backlight driver through the signal line; when the priority of the current transmission signal is lower than the priority of the abnormal information of the target backlight driver, interrupt the transmission of the current transmission signal, and send a second return instruction to the target backlight driver so that the target backlight driver returns the abnormal information of the target backlight driver through the signal line. If the signal line is not occupied, send a second return instruction to the target backlight driver so that the target backlight driver returns the abnormal information of the target backlight driver through the signal line. In this way, the timely transmission of signals or instructions with higher priority can be guaranteed. For example, the current transmission signal can be, for example, a clock signal, or abnormal information of other backlight drivers.

In some examples, when there are multiple target backlight drivers, the second return instruction may carry a return time, and the return time is used to indicate the time when the target backlight driver returns the abnormal information. For example, the return time may be related to the priority of the abnormal information of the target backlight driver. When the priority of the abnormal information is high, the return time is short. The short return time indicates that the target backlight driver returns the abnormal information as soon as possible. When the priority of the abnormal information is low, the return time is long. It can be understood that the higher the priority of the abnormal information, the faster it needs to be processed, so that the abnormality can be processed in time.

In other embodiments, when the return instruction indicates that the abnormal information does not need to be returned, the controller may not perform any processing.

S103: The controller receives abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line.

In some embodiments, adjacent backlight drivers in the same column are connected via data lines and signal lines, and the first-level backlight driver in each column is connected to the controller via data lines and signal lines, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit.

When the target backlight driver is a backlight driver of another level other than the first level backlight driver, the target backlight driver sequentially transmits the abnormal information of the target backlight driver to the first level backlight driver through the signal line. The first level backlight driver transmits the abnormal information of the target backlight driver back to the controller through the signal line. The controller can receive the abnormal information of the target backlight driver transmitted back by the first level backlight driver through the signal line.

In other embodiments, adjacent backlight drivers in the same column are connected via data lines, and the first-stage backlight driver in each column is connected to the controller via the data line; and each backlight driver is connected to the controller via a signal line.

Accordingly, the controller can send the second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver. The controller can also send the second feedback instruction to the target backlight driver through the signal line according to the address of the target backlight driver.

For example, when there are multiple target backlight drivers, each target backlight driver can determine the order of returning the abnormal information according to the reception time of the second return instruction, for example, the target backlight driver that receives the second return instruction first returns the abnormal information first. Each target backlight driver can also determine the order of returning the abnormal information according to the return time in the second return instruction, for example, if the return time is longer, the order of returning the abnormal information is later, and if the return time is shorter, the order of returning the abnormal information is earlier.

The present application provides a control method for a backlight unit. When a first feedback instruction of a target backlight driver indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver, so that the target backlight driver feeds back the abnormal information of the target backlight driver through the signal line. Thus, when an abnormality exists in the target backlight driver and the abnormal information of the target backlight driver is fed back, the abnormal information of the target backlight driver is fed back to the controller. There is no need to feed back the abnormal information of all backlight drivers to the controller, thereby reducing the data processing amount and processing complexity of the controller. Furthermore, since the abnormal information is fed back by occupying part of the signal line, the transmission speed of the data transmitted to the backlight driver can be improved.

FIG3 shows a control method of a backlight unit provided by another embodiment of the present application. As shown in FIG3 , the control method of a backlight unit provided by this embodiment includes:

S201 , the controller transmits the brightness data of each level of backlight drivers in each column to the first level of backlight drivers in each column through the data lines of each column.

The first-level backlight driver of each column receives the brightness data of all backlight drivers in the same column, obtains the brightness data of the first-level backlight driver of the current column, and transmits the brightness data from the second-level backlight driver to the last-level backlight driver of the current column to the second-level backlight driver of the current column, until the last-level backlight driver of the current column obtains the brightness data of the last-level backlight driver of the current column.

The brightness data may include the address and brightness signal of each backlight driver, for example, the address 11 and brightness signal 11 of the backlight driver 11, the address 21 and brightness signal 21 of the backlight driver 21, ..., the address M1 and brightness signal M1 of the backlight driver M1. Accordingly, the data communication protocol may include the address and brightness signal 11 of the backlight driver 11, the address 21 and brightness signal 21 of the backlight driver 21, ..., and the address M1 and brightness signal M1 of the backlight driver M1, as shown in FIG4. Wherein, M is the number of backlight drivers in the backlight unit.

The brightness signal may be, for example, a current, or a mixed mode of current and pulse width (PWM), etc. The backlight driver may control the brightness of the light-emitting unit according to the brightness signal.

When transmitting brightness data, an indicator and a backlight driver function instruction (CMD) can also be transmitted. The indicator is used to indicate the beginning of a frame of brightness data. For example, the frame header uses a specific flag to distinguish different data frames. These flags enable the transmitter and receiver to accurately identify the starting position of the frame. The backlight driver function instruction is used to instruct the backlight driver to turn on or off the target function. The target function may include, for example, a delay function, a voltage fast feedback function, a black insertion function, an open circuit function, a short circuit function, etc. After receiving the backlight driver function instruction, each level of backlight driver can turn on the corresponding function and perform the corresponding operation.

The backlight driving function instruction may occupy multiple data bits. The specific number of bits of data occupied by each function may be determined according to actual conditions, or each function may be fixed to occupy 8 bits, 16 bits of data, etc.

Among them, the delay function refers to delaying the time for the light-emitting unit to light up, the voltage fast feedback function refers to feeding back the channel voltage of the backlight driver to the controller, and the black insertion function refers to inserting a black frame between two normal frames to cover up the gray afterimage of the picture.

S202: The controller receives the address of the target backlight driver and the first feedback instruction sent by the target backlight driver through the data line.

When the target backlight driver is detected to be abnormal, the target backlight driver can transmit the address of the target backlight driver and the first feedback instruction to the previous backlight driver of the target backlight driver, until the address of the target backlight driver is transmitted to the first backlight driver of the same column. The first backlight driver sends the address of the target backlight driver and the first feedback instruction to the controller.

There can be multiple target backlight drivers, each of which can sequentially transmit the address and first return instruction of the current backlight driver forward until the first-level backlight driver, and the first-level backlight driver sends the address and first return instruction of each target backlight driver to the controller.

For example, the target backlight driver includes backlight driver 11 to backlight driver m1. Backlight driver 11 can send the address 11 and the first return instruction 11 of backlight driver 11 to the controller when an abnormality is detected in backlight driver 11. Backlight driver 21 can transmit the address 21 and the first return instruction 21 of backlight driver 21 to backlight driver 11 when an abnormality is detected in backlight driver 21. Backlight driver 11 transmits the address 21 and the first return instruction 21 of backlight driver 21 to backlight driver 11. Backlight driver m1 can transmit the address m1 and the first return instruction m1 of backlight driver m1 forward when an abnormality is detected in backlight driver m1 until they are transmitted to backlight driver 11. Backlight driver 11 transmits the address of backlight driver m1 and whether to return instruction m1 to the controller.

Accordingly, the data communication protocol may include driver feedback information, and the driver feedback information may include the address 11 and the first feedback instruction 11 of the backlight driver 11, the address 21 and the first feedback instruction 21 of the backlight driver 21, ..., and the address m1 and the first feedback instruction m1 of the backlight driver m1, as shown in FIG4. Wherein, m is the number of the backlight drivers having abnormalities.

S203: When the first feedback instruction indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver.

There may be multiple target backlight drivers. After receiving the first feedback instruction from each target backlight driver, the controller sends a second feedback instruction to the target backlight driver if the first feedback instruction indicates that abnormal information needs to be fed back.

For example, the target backlight drivers include backlight drivers 11 to backlight driver m1, and the target backlight drivers that need to return abnormal information include backlight drivers 11 to backlight driver n1, where n is less than m and n is the number of target backlight drivers that need to return abnormal information.

The controller sends a second feedback instruction to the backlight driver 11 to the backlight driver n1. Accordingly, the data communication protocol may include notifying the driver to feedback information, and the notifying driver feedback information may include the address 11 and the second feedback instruction of the backlight driver 11, the address 21 and the second feedback instruction of the backlight driver 21, ..., and the address and the second feedback instruction of the backlight driver n1, as shown in FIG4 .

The controller can also send a return time to the backlight driver 11 to the backlight driver n1, so that each target backlight driver staggers the occupied signal line to ensure the effectiveness of information transmission. Accordingly, the data communication protocol can include the return time 11 of the backlight driver 11, the return time 21 of the backlight driver 21, ..., and the return time n1 of the backlight driver n1, as shown in FIG4.

S204: The controller receives abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line.

Among them, step S204 is implemented in a similar manner to step S103 in the embodiment of FIG. 2 , and will not be described in detail in this embodiment.

In the control method of the backlight driver provided in this embodiment, the controller sends brightness data through the data line, receives a first feedback instruction and sends a feedback instruction, receives abnormal information of the target backlight driver through the signal line, and improves the transmission speed of the data transmitted to the backlight driver.

FIG5 is a control method of a backlight unit provided by another embodiment of the present application. As shown in FIG5 , the control method of a backlight unit provided by this embodiment includes:

S301: A controller receives an address of a target backlight driver and a first return instruction sent by a target backlight driver via a data line.

When the target backlight driver is detected to be abnormal in the target backlight driver, the target backlight driver transmits the address of the target backlight driver and the first feedback instruction to the controller.

S302: When the first feedback instruction indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver.

The second feedback instruction is used to instruct the target backlight driver to feedback abnormal information of the target backlight driver.

S303: The controller receives abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line.

For example, when the abnormal information of the backlight driver 11 to the backlight driver m1 needs to be transmitted back to the controller, the address 11 and abnormal information 11 of the backlight driver 11 can be sent to the controller, the address 21 and information 21 of the backlight driver 21 can be sent to the controller, ..., and the address and abnormal information m1 of the backlight driver m1 can be sent to the controller. Accordingly, the signal communication protocol corresponding to the signal line can include the address 11 and abnormal information 11 of the backlight driver 11, the address and abnormal information 21 of the backlight driver 21, ..., and the address m1 and control instruction m1 of the backlight driver m1, as shown in FIG6 .

S304: Send a control instruction to the target backlight driver, where the control instruction is generated according to the abnormal information of the target backlight driver.

In this step, the controller generates a control instruction according to the abnormal information of the target backlight driver, and sends the control instruction to the target backlight driver.

For example, the control instruction can be used to control the target backlight driver to stop working. The control instruction can also control the target backlight driver to close a channel, where the channel refers to the connection line between the target backlight driver and the light-emitting unit. If the abnormal information of the target backlight driver indicates that the light-emitting unit connected to the target backlight driver fails, a control instruction can be generated and sent to the target backlight driver to control the target backlight driver to stop working or control the target backlight driver to close a channel.

In a specific application, the address of the target backlight driver is sent together with the control instruction so that the target backlight driver can obtain the corresponding control instruction.

In some embodiments, the controller may first release the signal line and send a control instruction to the target backlight driver through the data line. For example, when the abnormal information from backlight driver 11 to backlight driver n1 is transmitted back to the controller, the address 11 and control instruction 11 of backlight driver 11 may be sent to backlight driver 11, the address 21 and control instruction 21 of backlight driver 21 may be sent to backlight driver 21, ..., and the address and control instruction n1 of backlight driver n1 may be sent to backlight driver n1. Accordingly, the signal communication protocol corresponding to the signal line may include the address 11 and control instruction 11 of backlight driver 11, the address and control instruction 21 of backlight driver 21, ..., and the address n1 and control instruction n1 of backlight driver n1, as shown in FIG6 .

The controller may also release the signal line after sending a control instruction to the target backlight driver through the signal line.

In this way, crosstalk can be avoided during information transmission, ensuring that the signal line can handle other tasks, such as transmitting clock signals. After receiving the second feedback instruction, the target backlight driver feedbacks the abnormal information of the target backlight driver to the previous level backlight driver of the target backlight driver, until the abnormal information of the target backlight driver is feedback to the first level backlight driver. The first level backlight driver feedbacks the abnormal information of the target backlight driver to the controller, thereby feedbacking the abnormal information of the target backlight driver to the controller.

In some embodiments, when there are multiple target backlight drivers, the controller may send corresponding control instructions to each target backlight driver in sequence according to the abnormality priority of the target backlight driver. Specifically, the controller may save the abnormal information received within a preset time, for example, abnormal information 1, abnormal information 2, ..., abnormal information i are received in sequence within the preset time, and then sort the abnormal information according to the priority, and send corresponding control instructions to the corresponding target backlight driver according to the sorting.

In the control method of the backlight unit provided in the present application, after the controller receives the abnormal information of the target backlight driver, the controller processes the target backlight driver according to the abnormal information of the target backlight driver to ensure the normal operation of the backlight driver.

FIG7 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. As shown in FIG7 , the display device provided in this embodiment includes:

The backlight unit 50 and the controller 30 . The backlight unit 50 includes a plurality of backlight drivers 20 . The backlight drivers 20 are connected to the controller 30 via data lines 201 and signal lines 202 .

The target backlight driver transmits the address of the target backlight driver and the first return instruction to the controller when the target backlight driver is detected to be abnormal;

When the first feedback instruction indicates that abnormal information needs to be fed back, the controller exclusively occupies the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver;

After receiving the second feedback instruction, the target backlight driver feeds back the abnormal information of the target backlight driver to the controller through the signal line.

In some embodiments, as shown in FIG. 8 , adjacent backlight drivers in the same column are connected via data lines 201 and signal lines 202 , and the first-level backlight driver in each column is connected to the controller 30 via data lines 201 and signal lines 202 , and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit.

When the target backlight driver is a backlight driver of another level other than the first level backlight driver, the target backlight driver transmits the abnormal information of the target backlight driver forward sequentially through the signal line 202 until the first level backlight driver, and the first level backlight driver sends the abnormal information of the target backlight driver to the controller 30.

In other embodiments, as shown in FIG. 9 , adjacent backlight drivers 102 in the same column are connected via a data line 201 , and the first-level backlight driver in each column is connected to the controller 30 via a data line, and each backlight driver 102 is connected to the controller 30 via a signal line 202 .

The target backlight driver sends the abnormal information of the target backlight driver to the controller 30 via the signal line 202 .

In some embodiments, as shown in FIG. 10 , the controller 30 includes a system on chip (SOC) 301, which integrates multiple functions such as a central processing unit (CPU), a graphics processor (GPU), an audio processor, a video decoding processor, and a network interface. The system on chip 301 can be responsible for controlling and processing signals, images, sounds, and other data to ensure the stability and reliability of the device.

In actual applications, the system-level chip 301 is the core component of the mini light-emitting diode TV (Mini LED TV). The system-level chip 301 can not only process video signals, but also support various advanced functions such as intelligent image processing and audio optimization through powerful computing power.

Since the system-level chip 301 can be responsible for the overall control and data processing of the device, the system-level chip 301 can directly control the backlight driver. In this embodiment, the system-level chip 301 is connected to the first-level backlight driver of each column, and the system-level chip 301 can determine the corresponding abnormality processing method according to the abnormality information of the target backlight driver, and process the target backlight driver according to the abnormality processing method.

For example, the system-level chip pre-sets multiple exception handling methods for faults. After receiving the exception information of the target backlight driver sent by the first-level backlight driver, it can determine the exception handling method corresponding to the target backlight driver according to the pre-set multiple exception handling methods for faults, and then process the target backlight driver according to the exception handling method corresponding to the target backlight driver.

For example, the system-level chip can generate a control instruction based on the abnormal information of the target backlight driver, and send the control instruction to the first-level backlight driver through the data line. The first-level backlight driver sends the control instruction to the second-level backlight driver through the data line until the control instruction is sent to the target backlight driver. The control instruction can instruct the target backlight driver to stop working or close the channel of the target backlight driver. Among them, the abnormal information of the target backlight driver received by the system-level chip may include the address of the target backlight driver. When the system-level chip generates the control instruction, the address of the target backlight driver can be carried in the control instruction so as to send the control instruction to the target backlight driver.

For another example, the system-level chip can send a stop instruction to the power system corresponding to the backlight unit according to the abnormal information of the target backlight driver, so as to control the power system to stop supplying power, so that the target backlight driver stops working.

In other embodiments, as shown in FIG11 , the controller 30 includes a system-level chip 301 and a backlight controller 302. The system-level chip 301 is connected to the backlight controller (Dimming controller) 302. The backlight controller 302 is responsible for the timing and brightness of the backlight unit to ensure that the brightness is scanned synchronously with the image, thereby achieving better image quality. The backlight controller 302 is connected to the first-level backlight driver of each column. At this time, the first-level backlight driver can send abnormal information of the target backlight driver to the backlight controller 302.

As an implementation method, a variety of fault exception handling methods can be pre-set in the backlight controller. Therefore, after the backlight driver receives the exception information of the target backlight driver, it can determine the exception handling method corresponding to the target backlight driver based on the exception information of the target backlight driver, and process the target backlight driver according to the exception handling method corresponding to the target backlight driver.

For example, the backlight controller can generate a control instruction based on the abnormal information of the target backlight driver, and send the control instruction to the first-level backlight driver through the data line. The first-level backlight driver sends the control instruction to the second-level backlight driver through the data line until the control instruction is sent to the target backlight driver to stop the target backlight driver from working or close the channel of the target backlight driver.

For another example, the backlight controller may control the backlight controller to stop working according to the abnormal information of the target backlight driver, so that the target backlight driver stops working.

For another example, the backlight controller may send a stop instruction to the power system corresponding to the backlight unit according to the abnormal information of the target backlight driver, and the stop instruction is used to control the power system to stop supplying power so that the target backlight driver stops working.

As another implementation method, a variety of fault exception handling methods can be pre-set in the system-level chip, so after the backlight driver receives the exception information of the target backlight driver, it can send the exception information of the target backlight driver to the system-level chip; the system-level chip can determine the exception handling method corresponding to the target backlight driver based on the exception information of the target backlight driver, and send the exception handling method corresponding to the target backlight driver to the backlight controller; the backlight controller processes the target backlight driver according to the exception handling method corresponding to the target backlight driver.

For example, the system-level chip may send a stop instruction to the backlight controller according to the abnormal information of the target backlight driver, so as to stop the backlight controller from working, thereby causing the target backlight driver to stop working.

For another example, the system-level chip may send a stop instruction to the power system corresponding to the backlight unit according to the abnormal information of the target backlight driver, so as to stop the power system from working, thereby stopping the target backlight driver from working.

For another example, the system-level chip can generate a control instruction based on the abnormal information of the target backlight driver, and send the control instruction to the backlight controller. The backlight controller sends the control instruction to the first-level backlight driver through the data line until the control instruction is sent to the target backlight driver to stop the target backlight driver from working or close the channel of the target backlight driver.

In some other embodiments, as shown in FIG12 , the controller includes a system-level chip 301, a timing controller (TCON) 303 and a backlight controller 302. The timing controller 303 is responsible for the timing action of the LCD screen to ensure that the image can be displayed correctly, and is also responsible for the display function and signal transmission of the backlight. The timing controller 303 converts the video signal output by the system-level chip 301 into a data signal that can be directly used by the LCD screen and a control signal of the backlight driver. The timing controller 303 can accurately control the brightness and timing of each light-emitting unit to achieve a higher contrast. The system-level chip 301, the timing controller 303 and the backlight controller 302 work together. The system-level chip 301, as a core component, is responsible for the overall control and data processing of the device; the timing controller 303 converts the video signal into a format that can be used by the LCD screen to ensure that the image is displayed correctly; and the backlight controller 302 focuses on backlight control to improve the picture quality. The three together constitute the display system of the display device, providing users with a better visual experience.

As an implementation method, a variety of fault exception handling methods can be pre-set in the backlight controller. Therefore, after the backlight controller receives the exception information of the target backlight driver, it can determine the exception handling method corresponding to the target backlight driver based on the exception information of the target backlight driver, and process the target backlight driver according to the exception handling method corresponding to the target backlight driver.

For example, the backlight controller can generate a control instruction based on the abnormal information of the target backlight driver, and send the control instruction to the first-level backlight driver through the data line. The first-level backlight driver sends the control instruction to the second-level backlight driver through the data line until the control instruction is sent to the target backlight driver to stop the target backlight driver from working or close the channel of the target backlight driver.

For another example, the backlight controller may control the backlight controller to stop working according to the abnormal information of the target backlight driver, so that the target backlight driver stops working.

For another example, the backlight controller may send a stop instruction to the power system corresponding to the backlight unit according to the abnormal information of the target backlight driver, and the stop instruction is used to control the power system to stop supplying power so that the target backlight driver stops working.

As another implementation method, a variety of fault exception handling methods can be pre-set in the timing controller, so after the backlight driver receives the exception information of the target backlight driver, the exception information of the target backlight driver can be sent to the timing controller; the timing controller can determine the corresponding exception handling method based on the exception information of the target backlight driver, and send the exception handling method to the backlight controller; the backlight controller processes the target backlight driver according to the exception handling method.

For example, the timing controller may send a stop instruction to the backlight controller according to the abnormal information of the target backlight driver, so as to stop the backlight controller from working, thereby causing the target backlight driver to stop working.

For another example, the timing controller may send a stop instruction to the power system corresponding to the backlight unit according to the abnormal information of the target backlight driver, so as to stop the power system from working, thereby stopping the target backlight driver from working.

For another example, the timing controller can generate a control instruction based on the abnormal information of the target backlight driver and send the control instruction to the backlight controller. The backlight controller sends the control instruction to the first-level backlight driver through the data line until the control instruction is sent to the target backlight driver to stop the target backlight driver from working or close the channel of the target backlight driver.

As another implementation method, a variety of fault exception handling methods can be pre-set in the system-level chip. Therefore, after the backlight driver receives the exception information of the target backlight driver, it can send the exception information of the target backlight driver to the timing controller, and the timing controller will send the exception information of the target backlight driver to the system-level chip; the system-level chip can determine the corresponding exception handling method based on the exception information of the target backlight driver, and send the exception handling method to the timing controller, and the timing controller sends the exception handling method to the backlight controller; the backlight controller processes the target backlight driver according to the exception handling method.

For example, the system-level chip can send a stop instruction to the timing controller according to the abnormal information of the target backlight driver, and the timing controller sends the stop instruction to the backlight controller to stop the backlight controller from working, thereby stopping the target backlight driver from working.

For another example, the system-level chip may send a stop instruction to the power system corresponding to the backlight unit according to the abnormal information of the target backlight driver, so as to stop the power system from working, thereby stopping the target backlight driver from working.

For another example, the system-level chip can generate a control instruction based on the abnormal information of the target backlight driver, send the control instruction to the timing controller, the timing controller sends the control instruction to the backlight controller, and the backlight controller sends the control instruction to the first-level backlight driver through the data line until the control instruction is sent to the target backlight driver to stop the target backlight driver from working or close the channel of the target backlight driver.

In some embodiments, as shown in FIG. 13 , each backlight driver includes a feedback function module 204, and the feedback function module 204 includes at least one of the following inspection modules: an input and output disconnection inspection module 2041, a fault inspection module 2042, an overheating inspection module 2043, a light-emitting unit open circuit inspection module 2044, a light-emitting unit short circuit inspection module 2045, and a driving channel voltage inspection module 2046. The input and output short circuit inspection module 2041 is used to check whether the data line connected to the corresponding backlight driver has a fault, such as whether there is an open circuit, a short circuit, etc. The fault inspection module 2042 is used to check whether the corresponding backlight driver itself has a fault. The overheating inspection module 2043 is used to check whether the temperature of the corresponding backlight driver is abnormal. The light-emitting unit open circuit inspection module 2044 is used to check whether the light-emitting unit connected to the corresponding backlight driver has an open circuit fault. The light-emitting unit short circuit inspection module 2045 is used to check whether the light-emitting unit connected to the corresponding backlight driver has a short circuit fault. The driving channel voltage detection module 2046 is used to check the voltage of each channel of the corresponding backlight driver, and can feed back the voltage of each channel of the backlight driver to the controller.

In actual application, as shown in FIG13 , each backlight driver may further include a logic processing module 205, a driving module 206, a power supply module 201, an input-output module 203, and an oscillator module 202. The power supply module 201 is connected to the logic processing module 205 and the driving module 206; the input-output module 203 is connected to the logic processing module 205 and the feedback function module 204; the oscillator module 202 is connected to the logic processing module 205; the logic processing module 205 is also connected to the feedback function module 204 and the driving module 206, and the driving module 206 is connected to the light-emitting unit.

The power supply module 201 is used to receive an external voltage VDD and to supply power to the logic processing module 205 and the driving module 206. The feedback function module 204 can transmit the current working information of the backlight driver to the logic processing module 205 and the driving module 206, and can also transmit the abnormal information of the current backlight driver to the input and output module 203.

The input-output module 203 can receive a brightness signal of at least one backlight driver, and send the brightness signal of the current backlight driver to the logic processing module 205. For example, the input-output module 203 can receive brightness signals of the current backlight driver and the remaining backlight drivers, take away the brightness signal of the current backlight driver, send the brightness signal of the current backlight driver to the logic processing module 205, and transmit the brightness signal of the remaining backlight drivers to the next level backlight driver of the current backlight driver, and the remaining backlight drivers refer to all backlight drivers after the current backlight driver in the same column.

The input/output module 203 may also transmit the abnormal information of the current backlight driver to a previous backlight driver of the current backlight driver after receiving the abnormal information of the current backlight driver output by the feedback function module 204 .

The oscillator module 202 is used to provide a clock signal for the logic processing module 205. The logic processing module 205 is used to generate a corresponding control signal according to the clock signal, the brightness signal and the feedback signal, and send the control signal to the corresponding driving module 206. For example, when the feedback signal indicates that the current backlight driver is in a normal working state, a corresponding control signal is generated according to the clock signal and the brightness signal.

The driving module 206 is used to control the brightness, flickering mode, etc. of the connected light-emitting units. For example, when the feedback signal indicates that the current backlight driver is in a normal working state, the brightness of the light-emitting unit is controlled, and when the feedback signal indicates that the light-emitting unit connected to the current backlight driver is abnormal, the control of the light-emitting unit is stopped.

In some embodiments, each backlight driver may include multiple pins, for example, a power pin VDD, a ground pin GND, an input pin DI, an output pin DO, a readback signal input pin SG_I, a readback signal output pin SG_O, etc., as shown in FIG. 14. In combination with FIG. 11 and FIG. 12, the power supply module 201 is connected to the power pin VDD to receive an external voltage through the power pin VDD. The ground pin GND of the backlight driver is grounded to ensure the safety of the backlight driver. The input pin DI and the output pin DO are connected to the input-output module 203, and the input-output module 203 receives the brightness signal of at least one backlight driver through the input pin DI, and transmits the brightness signal of the remaining backlight drivers to the next level backlight driver of the current backlight driver through the output pin DO. The feedback function module 204 is connected to the readback signal input pin SG_I and the readback signal output pin SG_O. The feedback function module 204 receives the abnormal information of the target backlight driver sent by the next-level backlight driver of the current backlight driver through the readback signal input pin SG_I. The feedback function module 204 transmits the abnormal information of the target backlight driver to the previous-level backlight driver of the current backlight driver through the readback signal output pin SG_O.

For example, taking a column of backlight drivers as an example, the input pin DI ₁ of the first-stage backlight driver is connected to the controller, the output pin DO ₁ of the first-stage backlight driver is connected to the input pin DI ₂ of the second-stage backlight driver, the output pin DO ₂ of the second-stage backlight driver is connected to the input pin DI ₃ of the third-stage backlight driver, and so on, the output pin DO _N-1 of the N-1-stage backlight driver is connected to the input pin DI _N of the N-stage backlight driver. After the input pin DI ₁ of the first-stage backlight driver receives the brightness signal, the brightness signal is input to the input pin DI ₂ of the second-stage backlight driver through the output pin DO ₁ of the first-stage backlight driver, and so on, until the brightness signal is transmitted to the N-stage backlight driver DI _N through the output pin DO _N-1 of the N-1-stage backlight driver.

The readback signal output pin SG_O ₁ of the first-level backlight driver is connected to the controller, the readback signal input pin SG_I ₁ of the first-level backlight driver is connected to the readback signal output pin SG_O ₂ of the second-level backlight driver, the readback signal input pin SG_I ₂ of the second-level backlight driver is connected to the readback signal output pin SG_O ₃ of the third-level backlight driver, and so on. The readback signal input pin SG_I _N-1 of the N-1th-level backlight driver is connected to the readback signal output pin SG_O _N of the Nth-level backlight driver.

If the target backlight driver is the Mth-level backlight driver, M is an integer greater than 1 and less than N, the Mth-level backlight driver transmits the abnormal signal of the Mth-level backlight driver to the readback signal input pin SG_I _M-1 of the M-1th-level backlight driver through the readback signal output pin SG_O _M of the Mth-level backlight driver, and so on, until the readback signal input pin SG_I ₁ of the first-level backlight driver receives the abnormal information of the Mth-level backlight driver, and then the first-level backlight driver can transmit the abnormal signal of the Mth-level backlight driver to the controller through the readback signal output pin SG_O ₁ .

In other embodiments, each backlight driver may include a readback pin SG, the readback pin SG is connected to the controller, and the target backlight driver may transmit abnormal information to the controller through the readback pin SG, and receive control instructions sent by the controller.

The display device provided in the present application includes a backlight unit and a controller. When the target backlight driver in the backlight unit monitors that there is an abnormality in the target backlight driver, the address and the first feedback instruction of the target backlight driver are sent to the controller, and after receiving the second feedback instruction of the controller, the abnormal information is sent to the controller through a signal line, thereby eliminating the need to feedback the working information of all the backlight drivers to the controller, reducing the amount of data processing, and improving the transmission speed of data transmitted to the backlight device.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (13)

1. A control method for a backlight unit, characterized in that the backlight unit comprises a plurality of backlight drivers, the backlight drivers are connected to a controller via data lines and signal lines, the method is applicable to the controller, and the method comprises: receiving the address and the first return instruction of the target backlight driver sent by the target backlight driver through the data line; when the target backlight driver detects that the target backlight driver is abnormal, the target backlight driver transmits the address and the first return instruction of the target backlight driver to the controller; When the first feedback instruction indicates that abnormal information needs to be fed back, the controller exclusively occupies the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver; the second feedback instruction is used to instruct the target backlight driver to feed back abnormal information of the target backlight driver; The abnormal information of the target backlight driver is received and transmitted back by the target backlight driver through the signal line. 2. The control method according to claim 1 is characterized in that adjacent backlight drivers in the same column are connected through the data line and the signal line, and the first-level backlight driver in each column is connected to the controller through the data line and the signal line, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit. 3. The control method according to claim 1, characterized in that adjacent backlight drivers in the same column are connected via the data line, and the first-stage backlight driver in each column is connected to the controller via the data line; Each of the backlight drivers is connected to the controller via the signal line. 4. The control method according to claim 2, wherein the step of sending a second feedback instruction to the target backlight driver according to the address of the target backlight driver comprises: sending a second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver, and when the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver; Or, a second feedback instruction is sent to the first-level backlight driver through the signal line according to the address of the target backlight driver. When the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver transmits the second feedback instruction backward in sequence through the signal line until it is transmitted to the target backlight driver. 5. The control method according to claim 3, wherein the step of sending a second feedback instruction to the target backlight driver according to the address of the target backlight driver specifically comprises: sending a second feedback instruction to the first-level backlight driver through the data line according to the address of the target backlight driver, and when the target backlight driver is a backlight driver of another level other than the first-level backlight driver, the first-level backlight driver sequentially transmits the second feedback instruction backward through the data line until it is transmitted to the target backlight driver; Or, sending a second feedback instruction to the target backlight driver through the signal line according to the address of the target backlight driver. 6. The control method according to claim 4, characterized in that the number of the target backlight drivers is multiple; The sending a second return instruction to the target backlight driver according to the address of the target backlight driver specifically includes: A second feedback instruction is sent to the first-level backlight driver via the data line or the signal line, and the second feedback instruction includes the address of each of the target backlight drivers, so that each of the target backlight drivers recognizes that when the second feedback instruction carries the address of the corresponding target backlight driver, abnormal information of the corresponding target backlight driver is fed back. 7. The control method according to claim 5, characterized in that the number of the target backlight drivers is multiple; The sending a second return instruction to the target backlight driver according to the address of the target backlight driver specifically includes: Sending a second feedback instruction to the first-level backlight driver through the data line, wherein the second feedback instruction includes the address of each of the target backlight drivers, so that each of the target backlight drivers recognizes that when the second feedback instruction carries the address of the corresponding target backlight driver, it feedbacks abnormal information of the corresponding target backlight driver; Or, a second feedback instruction is sent to each of the target backlight drivers through the signal line according to the address of the target backlight driver. 8. The control method according to any one of claims 1 to 7, characterized in that when the first feedback instruction indicates that abnormal information needs to be fed back, the controller exclusively occupies the signal line and sends a second feedback instruction to the target backlight driver, specifically comprising: When the first feedback instruction indicates that abnormal information needs to be fed back, the controller determines whether the signal line is occupied; If the signal line is occupied, comparing the priority of the current transmission signal of the signal line with the abnormal information of the target backlight driver; When the priority of the current transmission signal is higher than the priority of the abnormal information of the target backlight driver, after the current transmission signal is transmitted, sending the second return instruction to the target backlight driver; When the priority of the current transmission signal of the signal line is lower than the priority of the abnormal information of the target backlight driver, interrupting the transmission of the current transmission signal and sending the return instruction to the target backlight driver; If the signal line is not occupied, a second feedback instruction is sent to the target backlight driver. 9. The control method according to any one of claims 1 to 7, characterized in that after receiving the abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line, the method further comprises: releasing the signal line, and sending a control instruction to the target backlight driver via the data line; or, after sending the control instruction to the target backlight driver via the signal line, releasing the signal line; The control instruction is generated according to the abnormal information of the target backlight driver. 10. The control method according to any one of claims 1 to 7, characterized in that after receiving the abnormal information of the target backlight driver transmitted back by the target backlight driver through the signal line, the method further comprises: When there are multiple target backlight drivers, corresponding control instructions are sent to each target backlight driver in turn according to the abnormality priority of each target backlight driver, and the control instructions corresponding to each target backlight driver are generated according to the abnormality information of each target backlight driver. 11. A display device, comprising: a backlight unit and a controller, wherein the backlight unit comprises a plurality of backlight drivers, and the backlight drivers are connected to the controller via data lines and signal lines; The target backlight driver transmits the address of the target backlight driver and the first return instruction to the controller when the target backlight driver is detected to be abnormal; When the first feedback instruction indicates that abnormal information needs to be fed back, the controller monopolizes the signal line and sends a second feedback instruction to the target backlight driver according to the address of the target backlight driver; After receiving the second feedback instruction, the target backlight driver feeds back the abnormal information of the target backlight driver to the controller through the signal line. 12. The display device according to claim 11 is characterized in that adjacent backlight drivers in the same column are connected through the data line and the signal line, and the first-level backlight driver in each column is connected to the controller through the data line and the signal line, and the first-level backlight driver in each column is the backlight driver closest to the controller in the backlight unit. 13. The display device according to claim 11, characterized in that adjacent backlight drivers in the same column are connected through the data line, and the first-stage backlight driver of each column is connected to the controller through the data line; Each of the backlight drivers is connected to the controller via the signal line.