Backlight control circuit, backlight control method and display device

Abstract

The invention discloses a backlight control circuit, a backlight control method and a display device, and relates to the technical field of display. In the application, the backlight control circuit comprises: a signal connector for outputting a first enable signal; the time schedule controller is used for outputting a second enable signal according to the first enable signal and the current state of the video transmission link; wherein the current state of the video transmission link is used for determining whether to adjust the first enable signal; and the backlight driving chip is used for controlling the backlight source to be turned on or turned off according to the second enable signal. According to the invention, the enable signal is introduced into the time schedule controller, and the time schedule controller adjusts the enable signal according to the current state of the video transmission link, so that the pulse width modulation signal is ensured to be normally output when the enable signal outputs a high level. The phenomenon that the peak voltage is mistakenly recognized as the high level when the backlight driving chip undetermines the level state of the pulse width modulation signal is avoided, and therefore the flicker phenomenon of the display device is avoided.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight control circuit, a backlight control method and a display device. Background Art

[0002] Liquid crystal display technology is one of the most widely used display technologies. However, liquid crystal materials themselves cannot emit light, and a backlight driver chip is needed to control the backlight source to emit light, so as to achieve the function of displaying images. Among them, the backlight driver chip needs a power supply to provide current, the enable signal controls the on and off of the backlight source, and the pulse width modulation (PWM) signal controls the brightness of the backlight source. Usually, Figure 1 As shown, the signal connector can output video data, enable signal and pulse modulation signal. Among them, the signal connector can be connected to the host computer to receive video data transmitted from the host computer. Figure 1 In the backlight control circuit shown, the enable signal output by the signal connector is directly input to the backlight driver chip, the pulse modulation signal is processed by the timing controller and then input to the backlight driver chip. In addition, the video data is directly input to the timing controller for displaying the picture.

[0003] Normally, the backlight power supply (backlight source power signal), enable signal, and pulse width modulation signal need to work according to the standard timing to ensure good function. However, if the standard timing is not set for various reasons during the hardware design or debugging of new products, it may cause abnormal display function. For example, Figure 2 is a possible standard timing diagram, compared to Figure 2 In the standard timing shown, the enable signal outputs a high level after the pulse width modulation signal. Figure 3 In the timing sequence shown, the enable signal outputs a high level before the pulse width modulation signal. If the timing controller (Tcon) has just been powered on and has not completed initialization when the display device is turned on, the output pulse width modulation signal will be in an uncertain level state, and there may be a peak voltage. Figure 3 The enable signal shown in the figure, the backlight driver chip will recognize the peak voltage of the pulse width modulation signal as a high level. Since the peak voltage is not a continuous voltage, the high level of the pulse width modulation signal caused by it is only a temporary state, which will cause the backlight source to turn on and off quickly, causing the display device to flicker at the moment of powering on. Summary of the invention

[0004] The embodiments of the present application provide a backlight control circuit, a backlight control method and a display device, which can improve the flickering phenomenon that occurs when the display device is turned on.

[0005] The embodiment of the present application provides a backlight control circuit, including:

[0006] A signal connector, used for outputting a first enabling signal;

[0007] A timing controller, configured to output a second enable signal according to the first enable signal and a current state of a video transmission link; wherein the video transmission link is used to transmit video data between the signal connector and the timing controller, and the current state of the video transmission link is used to determine whether to adjust the first enable signal;

[0008] The backlight driving chip is used to control the backlight source to turn on or off according to the second enable signal.

[0009] Optionally, the timing controller is further used for:

[0010] If the current state of the video transmission link is a data transmission state, outputting the second enable signal having the same level state as the first enable signal;

[0011] If the current state of the video transmission link is a non-data transmission state, the second enable signal whose level state is a low level is output.

[0012] Optionally, the timing controller is further used for:

[0013] If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a high level, adjusting the level state of the first enable signal from a high level to a low level to obtain the second enable signal;

[0014] If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a low level, the first enable signal is used as the second enable signal.

[0015] Optionally, the timing controller is further used for:

[0016] Acquire current data stored in a line buffer; wherein the line buffer is used to store the decoded video data;

[0017] If the current data stored in the line buffer is different from the preset data, determining that the current state of the video transmission link is the data transmission state;

[0018] If the current data stored in the line buffer is the same as the preset data, it is determined that the current state of the video transmission link is the non-data transmission state.

[0019] Optionally, the backlight driver chip is also used for:

[0020] If the level state of the second enable signal is a high level, controlling the backlight source to turn on;

[0021] If the level state of the second enable signal is a low level, the backlight source is controlled to be turned off.

[0022] Accordingly, an embodiment of the present application provides a display device, including: a backlight source, and the backlight control circuit as described above.

[0023] Accordingly, an embodiment of the present application provides a backlight control method, including:

[0024] receiving a first enable signal;

[0025] A second enable signal is output based on the first enable signal and the current state of the video transmission link; wherein the video transmission link is used to transmit video data between the signal connector and the timing controller, and the current state of the video transmission link is used to determine whether to adjust the first enable signal; and the second enable signal is used to control the backlight source to be turned on or off.

[0026] Optionally, outputting a second enable signal according to the first enable signal and a current state of the video transmission link includes:

[0027] If the current state of the video transmission link is a data transmission state, outputting the second enable signal having the same level state as the first enable signal;

[0028] If the current state of the video transmission link is a non-data transmission state, the second enable signal whose level state is a low level is output.

[0029] Optionally, if the current state of the video transmission link is a non-data transmission state, outputting the second enable signal whose level state is a low level includes:

[0030] If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a high level, adjusting the level state of the first enable signal from a high level to a low level to obtain the second enable signal;

[0031] If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a low level, the first enable signal is used as the second enable signal.

[0032] Optionally, the method further comprises:

[0033] Acquire current data stored in a line buffer; wherein the line buffer is used to store the decoded video data;

[0034] If the current data stored in the line buffer is different from the preset data, determining that the current state of the video transmission link is the data transmission state;

[0035] If the current data stored in the line buffer is the same as the preset data, it is determined that the current state of the video transmission link is the non-data transmission state.

[0036] The beneficial effects provided by the embodiments of the present application include at least:

[0037] The backlight control circuit provided by the embodiment of the present application includes a signal connector, a timing controller and a backlight driver chip, wherein the timing controller is used to output a second enable signal to the backlight driver chip according to the current state of the video transmission link and the first enable signal output by the signal connector, so that the backlight driver chip controls the backlight source to turn on or off according to the second enable signal. Since the pulse width modulation signal will be output normally without the spike voltage after the video transmission link is in the data transmission state, the embodiment of the present application introduces the enable signal into the timing controller, and the timing controller adjusts the enable signal according to the current state of the video transmission link to ensure that the pulse width modulation signal is normally output when the enable signal outputs a high level, so as to avoid the backlight driver chip mistakenly identifying the spike voltage that occurs when the pulse width modulation signal level state is uncertain as a high level, thereby avoiding causing the display device to flicker. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of a backlight control circuit;

[0039] Figure 2 It is a schematic diagram showing a working timing of a display device;

[0040] Figure 3 is a schematic diagram of another operating timing of the display device;

[0041] Figure 4 is a schematic diagram of a backlight control circuit provided in an embodiment of the present application;

[0042] Figure 5 is a schematic diagram of a processing logic provided by an embodiment of the present application;

[0043] Figure 6 It is a schematic diagram of a working sequence provided by an embodiment of the present application;

[0044] Figure 7 It is a flow chart of a backlight control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0046] In addition, the "plurality" in the embodiments of the present application refers to two or more. The "first" and "second" in the embodiments of the present application are used to distinguish different technical features, and do not indicate any order, quantity or importance.

[0047] The various embodiments provided in this application are similar, and features in different embodiments may be combined with each other.

[0048] The order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0049] To solve the above technical problems, the embodiments of the present application provide a backlight control circuit, a backlight control method and a display device. The display device can be integrated in a display device, which can be a TV, a smart phone, a tablet computer, a laptop computer, a desktop computer, a smart speaker, a smart watch, etc., but is not limited thereto.

[0050] According to a first aspect of an embodiment of the present application, an embodiment of the present application provides a backlight control circuit.

[0051] The backlight control circuit provided in the embodiment of the present application includes:

[0052] A signal connector, used for outputting a first enabling signal;

[0053] A timing controller, configured to output a second enable signal according to the first enable signal and a current state of a video transmission link; wherein the video transmission link is used to transmit video data between the signal connector and the timing controller, and the current state of the video transmission link is used to determine whether to adjust the first enable signal;

[0054] The backlight driving chip is used to control the backlight source to turn on or off according to the second enabling signal.

[0055] Different from Figure 1 In the backlight control circuit shown in the embodiment of the present application, the enable signal is introduced into the timing controller, that is, the enable signal output by the signal connector is input into the timing controller, and after being processed by the timing controller, the enable signal is output from the timing controller to the backlight driver chip, such as Figure 4 In this embodiment of the present application, the enable signal output by the signal connector is referred to as a first enable signal, and the enable signal output by the timing controller is referred to as a second enable signal.

[0056] After receiving the first enable signal output by the signal connector, the timing controller outputs a second enable signal according to the first enable signal and the current state of the video transmission link. The video transmission link is used to transmit video data, and the video transmission link may refer to the main link (Main Link) of the display device. Optionally, the state of the video transmission link includes: data transmission state (video), idle state (idle), link training state (link training) and off state (off), etc., which is not limited in the embodiments of the present application. Among them, the data transmission state means that the video transmission link is currently transmitting video data.

[0057] Since the pulse width modulation signal will be output normally without the occurrence of spike voltage after the video transmission link is in the data transmission state, the embodiment of the present application determines whether to adjust the first enable signal according to the current state of the video transmission link to ensure that the pulse width modulation signal is output normally when the enable signal outputs a high level, thereby preventing the backlight driver chip from misidentifying the spike voltage that occurs when the pulse width modulation signal level state is uncertain as a high level, thereby avoiding flickering in the display device.

[0058] Based on this, in some embodiments, the timing controller is used to: if the current state of the video transmission link is a data transmission state, then output a second enable signal with the same level state as the first enable signal; if the current state of the video transmission link is a non-data transmission state, then output a second enable signal with a low level state. That is to say, when the video transmission link is currently in a data transmission state, the level state of the enable signal output by the timing controller follows the level state of the enable signal input by the timing controller; when the video transmission link is currently in a non-data transmission state, no matter what level state the enable signal input by the timing controller is, the timing controller outputs an enable signal with a low level state. Among them, the non-data transmission state includes but is not limited to: idle state, closed state, link training state, etc., and the embodiments of the present application are not limited to this.

[0059] When the video transmission link is currently in a data transmission state, the level state of the second enable signal is the same as the level state of the first enable signal. Optionally, the timing controller can directly use the first enable signal as the second enable signal and output the second enable signal, that is, the timing controller directly outputs the input enable signal to the backlight driver chip; or, the timing controller can also generate a second enable signal that is the same as the first enable signal and output the second enable signal.

[0060] In the case where the video transmission link is currently in a non-data transmission state, the level state of the second enable signal is a low level. Optionally, in the case where the video transmission link is currently in a non-data transmission state, the timing controller can output the second enable signal in combination with the level state of the first enable signal; or, the timing controller can be pre-configured with a second enable signal with a low level, and when it is determined that the video transmission link is currently in a non-data transmission state, the pre-configured second enable signal is directly output. In the case where the timing controller outputs the second enable signal in combination with the level state of the first enable signal, if the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a high level, the timing controller adjusts the level state of the first enable signal from a high level to a low level, obtains and outputs the second enable signal; if the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a low level, the timing controller uses the first enable signal as the second enable signal, and outputs the second enable signal. In practical applications, the timing controller can also generate a second enable signal, rather than obtaining the second enable signal based on the adjustment of the first enable signal. For example, if the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a high level, the timing controller generates a second enable signal opposite to the first enable signal, and outputs the second enable signal; if the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a low level, the timing controller generates a second enable signal identical to the first enable signal, and outputs the second enable signal.

[0061] In order to identify the current state of the video transmission link, an embodiment of the present application obtains the current data stored in the line buffer and compares it with the preset data. Among them, the line buffer is used to store decoded video data, and the video data is transmitted through the video transmission link. The preset data refers to the default data pre-configured for the line buffer. The embodiment of the present application does not limit the specific content of the preset data. For example, the preset data is the data when the display device is black. Based on this, in some embodiments, the above-mentioned timing controller is also used to: obtain the current data stored in the line buffer; if the current data stored in the line buffer is different from the preset data, it is determined that the current state of the video transmission link is a data transmission state; if the current data stored in the line buffer is the same as the preset data, it is determined that the current state of the video transmission link is a non-data transmission state.

[0062] After being processed by the timing controller, the backlight driver chip receives the second enable signal output by the timing controller, and then controls the backlight source to be turned on or off according to the second enable signal. That is, the backlight driver chip is used to: if the level state of the second enable signal is high, then control the backlight source to be turned on; if the level state of the second enable signal is low, then control the backlight source to be turned off.

[0063] It can be seen from the above embodiments that the backlight driver chip can control the brightness of the backlight source according to the pulse width modulation signal. Based on this, in some embodiments, the signal connector is also used to output the first pulse width modulation signal; the timing controller is also used to adjust the duty cycle of the first pulse width modulation signal and output the second pulse width modulation signal corresponding to the first pulse width modulation signal; the backlight driver chip is also used to control the brightness of the backlight source according to the second pulse width modulation signal. Of course, in actual applications, the pulse width modulation signal output by the signal connector can also be directly input to the backlight driver chip, that is, the signal connector is also used to output the first pulse width modulation signal, and the backlight driver chip is also used to control the brightness of the backlight source according to the first pulse width modulation signal.

[0064] The following is an introduction to the embodiment of the present application using a specific example.

[0065] like Figure 4 As shown, in this example, the enable signal is introduced into the timing controller, and the timing controller may include an enable signal processing module, in which a data comparator and a line buffer may be built. After the timing controller receives the first enable signal output by the signal connector, the current data stored in the line buffer may be obtained through the data comparator, and the current data stored in the line buffer may be compared with the preset data to determine the current state of the video transmission link.

[0066] When the data comparator determines that the current state of the video transmission link is the data transmission state, the enable signal processing module can use the first enable signal as the second enable signal and output the second enable signal to the backlight driver chip. Figure 6 As shown, when the data comparator determines that the video transmission link is currently in the data transmission state, if the level state of the first enable signal is low, the enable signal processing module outputs a second enable signal with a low level; if the level state of the first enable signal is high, the enable signal processing module outputs a second enable signal with a high level.

[0067] When the data comparator determines that the current state of the video transmission link is a non-data transmission state, the enable signal processing module outputs a second enable signal with a low level to the backlight driving chip. Figure 6As shown, when the data comparator determines that the video transmission link is currently in a non-data transmission state, no matter what level state the first enable signal is, the enable signal processing module outputs a second enable signal with a low level. The enable signal processing module can identify the level state of the first enable signal. At this time, if the level state of the first enable signal is a low level, the first enable signal is used as the second enable signal, and the second enable signal is output to the backlight driver chip; if the level state of the first enable signal is a high level, the level state of the first enable signal is adjusted from a high level to a low level, the second enable signal is obtained, and the second enable signal is output to the backlight driver chip.

[0068] Based on this example, Figure 5 As shown, in the processing of the enable signal processing module, the level state of the first enable signal and the current state of the video transmission link are in a logical AND relationship. Figure 6 As shown, this example enables the input and output of the signal processing module in the following situations:

[0069] If the current state of the video transmission link is the data transmission state, and the level state of the first enable signal is a high level, then the level state of the second enable signal is a high level;

[0070] If the current state of the video transmission link is the data transmission state, and the level state of the first enable signal is a low level, then the level state of the second enable signal is a low level;

[0071] If the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a high level, the level state of the second enable signal is a low level;

[0072] If the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a low level, then the level state of the second enable signal is a low level.

[0073] like Figure 5 As shown, in this example, the timing controller may also include a pulse width modulation signal processing module. The signal connector inputs the first pulse width modulation signal to the timing controller, and the pulse width modulation signal processing module processes the first pulse width modulation signal, such as adjusting the duty cycle of the first pulse width modulation signal, thereby obtaining a second pulse width modulation signal, and outputting the second pulse width modulation signal to the backlight driver chip. Of course, Figure 5 Taking the timing controller including a pulse width modulation signal processing module as an example, in actual applications, the pulse width modulation signal may not need to be processed by the timing controller, but may be directly output from the signal connector to the backlight driver chip, that is, the timing controller may not include a pulse width modulation signal processing module.

[0074] In summary, the backlight control circuit provided by the embodiment of the present application includes a signal connector, a timing controller and a backlight driver chip, wherein the timing controller is used to output a second enable signal to the backlight driver chip according to the current state of the video transmission link and the first enable signal output by the signal connector, so that the backlight driver chip controls the backlight source to turn on or off according to the second enable signal. Since the pulse width modulation signal will be output normally without a spike voltage after the video transmission link is in the data transmission state, the embodiment of the present application introduces the enable signal into the timing controller, and the timing controller adjusts the enable signal according to the current state of the video transmission link to ensure that the pulse width modulation signal is normally output when the enable signal outputs a high level, so as to avoid the backlight driver chip from misidentifying the spike voltage that occurs when the pulse width modulation signal level state is uncertain as a high level, thereby avoiding causing the display device to flicker.

[0075] According to a second aspect of the embodiments of the present application, the embodiments of the present application provide a display device, which includes a backlight source and a backlight control circuit as described in the first aspect above.

[0076] It should be understood that the explanation of terms, specific implementation methods and corresponding beneficial effects in the display device provided in the embodiment of the present application can refer to the introduction and description of the backlight control circuit provided in the embodiment of the present application, and will not be elaborated here.

[0077] According to a third aspect of the embodiments of the present application, the embodiments of the present application provide a backlight control method, such as Figure 7 As shown, the backlight control method includes:

[0078] Step 710: Receive a first enable signal;

[0079] Step 720: Output a second enable signal based on the first enable signal and the current state of the video transmission link; wherein the video transmission link is used to transmit video data between the signal connector and the timing controller, and the current state of the video transmission link is used to determine whether to adjust the first enable signal; the second enable signal is used to control the backlight source to be turned on or off.

[0080] In some embodiments, the outputting of the second enable signal according to the first enable signal and the current state of the video transmission link includes:

[0081] If the current state of the video transmission link is the data transmission state, a second enable signal having the same level state as the first enable signal is output;

[0082] If the current state of the video transmission link is a non-data transmission state, the output level state is a second enable signal of a low level.

[0083] In some embodiments, if the current state of the video transmission link is a non-data transmission state, the second enable signal whose output level state is a low level includes:

[0084] If the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a high level, the level state of the first enable signal is adjusted from a high level to a low level to obtain a second enable signal;

[0085] If the current state of the video transmission link is a non-data transmission state, and the level state of the first enable signal is a low level, the first enable signal is used as the second enable signal.

[0086] In some embodiments, the above method further comprises:

[0087] Acquire current data stored in a line buffer; wherein the line buffer is used to store decoded video data;

[0088] If the current data stored in the line buffer is different from the preset data, determining that the current state of the video transmission link is a data transmission state;

[0089] If the current data stored in the line buffer is the same as the preset data, it is determined that the current state of the video transmission link is a non-data transmission state.

[0090] It should be understood that the backlight control method provided in the embodiment of the present application can be executed by the backlight control circuit described in the first aspect. The explanation of terms, specific implementation methods and corresponding beneficial effects in the backlight control method can refer to the introduction and description of the backlight control circuit provided in the embodiment of the present application, and will not be elaborated here.

[0091] Those skilled in the art will appreciate that the display device may store program codes, which may be used to execute the backlight control method. The program codes may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0092] To this end, an embodiment of the present application provides a computer-readable storage medium, in which program code is stored. The program code can be loaded by a processor to execute the steps in the backlight control method provided in the embodiment of the present application.

[0093] The computer-readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0094] Since the program code stored in the computer-readable storage medium can execute the steps in the backlight control method provided in the embodiment of the present application, the beneficial effects that can be achieved by the backlight control method provided in the embodiment of the present application can be achieved. Please refer to the previous embodiments for details and will not be elaborated here.

[0095] The above is a detailed introduction to a backlight control circuit, a backlight control method and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A backlight control circuit, characterized in that: The backlight control circuit comprises: A signal connector, used for outputting a first enabling signal; A timing controller, configured to output a second enable signal according to the first enable signal and a current state of a video transmission link; wherein the video transmission link is used to transmit video data between the signal connector and the timing controller, and the current state of the video transmission link is used to determine whether to adjust the first enable signal; The backlight driving chip is used to control the backlight source to turn on or off according to the second enable signal.

2. The backlight control circuit according to claim 1, characterized in that: The timing controller is also used for: If the current state of the video transmission link is a data transmission state, outputting the second enable signal having the same level state as the first enable signal; If the current state of the video transmission link is a non-data transmission state, the second enable signal whose level state is a low level is output.

3. The backlight control circuit according to claim 2, characterized in that: The timing controller is also used for: If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a high level, adjusting the level state of the first enable signal from a high level to a low level to obtain the second enable signal; If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a low level, the first enable signal is used as the second enable signal.

4. The backlight control circuit according to claim 2, characterized in that: The timing controller is also used for: Acquire current data stored in a line buffer; wherein the line buffer is used to store the decoded video data; If the current data stored in the line buffer is different from the preset data, determining that the current state of the video transmission link is the data transmission state; If the current data stored in the line buffer is the same as the preset data, it is determined that the current state of the video transmission link is the non-data transmission state.

5. The backlight control circuit according to any one of claims 1 to 4, characterized in that: The backlight driver chip is also used for: If the level state of the second enable signal is a high level, controlling the backlight source to turn on; If the level state of the second enable signal is a low level, the backlight source is controlled to be turned off.

6. A display device, characterized in that: The display device comprises: a backlight source, and the backlight control circuit according to any one of claims 1 to 5.

7. A backlight control method, characterized in that: The backlight control method comprises: receiving a first enable signal; A second enable signal is output based on the first enable signal and the current state of the video transmission link; wherein the video transmission link is used to transmit video data between the signal connector and the timing controller, and the current state of the video transmission link is used to determine whether to adjust the first enable signal; and the second enable signal is used to control the backlight source to be turned on or off.

8. The backlight control method according to claim 7, characterized in that: The step of outputting a second enable signal according to the first enable signal and a current state of the video transmission link includes: If the current state of the video transmission link is a data transmission state, outputting the second enable signal having the same level state as the first enable signal; If the current state of the video transmission link is a non-data transmission state, the second enable signal whose level state is a low level is output.

9. The backlight control method according to claim 8, characterized in that: If the current state of the video transmission link is a non-data transmission state, the second enable signal whose output level state is a low level includes: If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a high level, adjusting the level state of the first enable signal from a high level to a low level to obtain the second enable signal; If the current state of the video transmission link is the non-data transmission state, and the level state of the first enable signal is a low level, the first enable signal is used as the second enable signal.

10. The backlight control method according to claim 8, characterized in that: The method further comprises: Acquire current data stored in a line buffer; wherein the line buffer is used to store the decoded video data; If the current data stored in the line buffer is different from the preset data, determining the current state of the video transmission link, the data transmission state; If the current data stored in the line buffer is the same as the preset data, it is determined that the current state of the video transmission link is the non-data transmission state.

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