Brightness Adjustment Method, Backlight Driving Module, Electronic Device, and Storage Medium

Abstract

Embodiments of the present application provide a brightness adjustment method, a backlight driving module, an electronic device, and a storage medium, relating to the field of terminal technologies. The method includes: receiving a first instruction for instructing to adjust the screen brightness of an LCD display screen from a first brightness to a second brightness; and adjusting the brightness of the backlight of the LCD display screen according to the second brightness when the brightness of the display screen meets a first preset condition. In this way, it is possible to confirm whether to adjust the brightness of the backlight according to the brightness of the display screen. When the display screen of the electronic device is relatively bright, no brightness adjustment is performed; when the display screen of the electronic device is relatively dark, brightness adjustment can be performed.

Description

Technical Field

[0001] This application relates to the technical field of terminals, and in particular, to a brightness adjustment method, a backlight driving module, an electronic device, and a storage medium. Background Art

[0002] During the use of electronic devices such as mobile phones and tablets, the brightness adjustment of the display screen may be involved. For example, in the case of a change in the ambient light, in order to view the display screen of the screen more clearly and comfortably, the user can manually adjust the screen brightness, or the electronic device automatically adjusts the screen brightness.

[0003] However, during the process of adjusting the screen brightness, brightness jump may occur, resulting in poor user experience. Summary of the Invention

[0004] Embodiments of this application provide a brightness adjustment method, a backlight driving module, an electronic device, and a storage medium, which are applied to the technical field of terminals. It helps to reduce the situation of screen brightness jump.

[0005] In a first aspect, embodiments of this application propose a brightness adjustment method. This method can be applied to a backlight driving module, a device including a backlight driving module (for example, a display screen), and a device including a backlight driving module. The backlight driving module is used to drive the backlight in the LCD display screen.

[0006] This method includes: receiving a first instruction, where the first instruction is used to indicate adjusting the screen brightness of the LCD display screen from a first brightness to a second brightness; and when the brightness of the display screen of the LCD display screen meets a first preset condition, adjusting the brightness of the backlight of the LCD display screen according to the second brightness.

[0007] The first preset condition may correspond to the preset condition A in the following text. The first brightness may correspond to the screen brightness before adjustment in the following text; the second brightness may correspond to the screen brightness after adjustment. The first brightness and the second brightness are different. The first brightness may be greater than the second brightness or less than the second brightness, and no specific limitation is made here. The first instruction may be generated in response to a first operation or a change in ambient light brightness. The display screen may also be referred to as a display interface, an interface, etc., and no specific limitation is made here.

[0008] In this way, it is possible to confirm whether to adjust the brightness of the backlight according to the brightness of the display screen. When the display screen of the electronic device is relatively bright, no brightness adjustment is performed; when the display screen of the electronic device is relatively dark, brightness adjustment can be performed to reduce the situation of brightness jump and improve the user experience.

[0009] In some embodiments, the method further includes: when the brightness of the display screen of the LCD display does not meet the first preset condition, not adjusting the brightness of the backlight, and continuing to determine whether the brightness of the display screen of the LCD display meets the first preset condition.

[0010] It can also be understood that when the brightness of the display screen of the LCD display does not meet the first preset condition, the brightness of the backlight of the LCD display is not adjusted until the brightness of the display screen of the LCD display meets the first preset condition. In this way, waiting for the brightness of the display screen to be darker before adjusting the brightness of the backlight can reduce the situation of brightness jump and improve the user experience.

[0011] In a possible implementation manner, the first preset condition includes: the average brightness of the display screen of the LCD display is less than or equal to the first threshold, or the maximum brightness of the display screen of the LCD display is less than or equal to the second threshold.

[0012] The first threshold can correspond to the brightness threshold A in the following text; the second threshold can correspond to the brightness threshold B in the following text, and no specific limitation is made here.

[0013] In this way, the brightness of the display screen can be characterized by the average brightness or the maximum brightness.

[0014] In a possible implementation manner, when the brightness of the display screen of the LCD display meets the first preset condition, adjusting the brightness of the backlight according to the second brightness includes: when the first brightness meets the second preset condition and the brightness of the display screen meets the first preset condition, adjusting the brightness of the backlight according to the second brightness.

[0015] The second preset condition can correspond to the preset condition B in the following text.

[0016] In this way, when the screen brightness before adjustment does not meet the preset condition B, the brightness judgment of the display screen is not performed, and there is no need to wait for the brightness of the display screen to be darker. The brightness of the backlight can be directly adjusted, shortening the brightness adjustment time of the backlight and making timely adjustment.

[0017] In some embodiments, when the brightness of the display screen of the LCD display does not meet the first preset condition, not adjusting the brightness of the backlight and continuing to determine whether the brightness of the display screen of the LCD display meets the first preset condition includes: when the first brightness meets the second preset condition and the brightness of the display screen of the LCD display does not meet the first preset condition, not adjusting the brightness of the backlight and continuing to determine whether the brightness of the display screen of the LCD display meets the first preset condition.

[0018] In this way, when the brightness of the display screen satisfies the second preset condition but does not satisfy the first preset condition, the brightness of the backlight of the LCD display screen is adjusted until the brightness of the display screen satisfies the first preset condition. In this way, waiting for the brightness of the display screen to become darker and then adjusting the brightness of the backlight reduces the situation of brightness jump and improves the user experience.

[0019] In a possible implementation manner, the method further includes: when the first brightness does not satisfy the second preset condition, adjusting the brightness of the backlight according to the second brightness.

[0020] In this way, when the brightness is relatively high, the user's sensitivity to brightness is weak, the time for brightness adjustment can be shortened, and the brightness can be adjusted in time.

[0021] In a possible implementation manner, the second preset condition includes: the first brightness is less than or equal to a third threshold. The third threshold may correspond to threshold A in the following text.

[0022] In a possible implementation manner, when the brightness of the display screen of the LCD display screen satisfies the first preset condition, adjusting the brightness of the backlight according to the second brightness includes: when the first brightness and the second brightness satisfy the third preset condition and the brightness of the display screen of the LCD display screen satisfies the first preset condition, adjusting the brightness of the backlight according to the second brightness.

[0023] The third preset condition may correspond to preset condition C in the following text.

[0024] In this way, when the brightness adjustment range is large, there is no need to wait for the display screen to be darker, the brightness adjustment time can be shortened, and the user's need for quickly adjusting the screen brightness can be met; when the brightness adjustment range is small, waiting for the display screen to be darker before adjusting the brightness reduces the situation of brightness jump and improves the user experience.

[0025] In some embodiments, when the brightness of the display screen of the LCD display screen does not satisfy the first preset condition, the brightness of the backlight is not adjusted, and it continues to be determined whether the brightness of the display screen of the LCD display screen satisfies the first preset condition, including: when the first brightness and the second brightness satisfy the third preset condition and the brightness of the display screen of the LCD display screen does not satisfy the first preset condition, the brightness of the backlight is not adjusted, and it continues to be determined whether the brightness of the display screen of the LCD display screen satisfies the first preset condition.

[0026] In this way, when the brightness of the display screen satisfies the third preset condition but does not satisfy the first preset condition, the brightness of the backlight of the LCD display screen is adjusted until the brightness of the display screen satisfies the first preset condition. Waiting for the brightness of the display screen to be darker and then adjusting the brightness of the backlight reduces the situation of brightness jump and improves the user experience.

[0027] In a possible implementation, the method further includes: when the brightness of the display screen does not meet the third preset condition, adjusting the brightness of the backlight of the LCD display screen. In this way, when the brightness adjustment range is large, there is no need to wait for the display screen to be darker, which can shorten the brightness adjustment time and meet the user's need for quickly adjusting the screen brightness.

[0028] In a possible implementation, the third preset condition includes: the absolute value of the difference between the first brightness and the second brightness is less than or equal to a fourth threshold value. The fourth threshold value can correspond to the preset value A in the following text.

[0029] In a possible implementation, when the brightness of the display screen meets the first preset condition, adjusting the brightness of the backlight of the LCD display screen according to the second brightness includes: when the brightness of the display screen meets the first preset condition, the first brightness meets the second preset condition, and the first brightness and the second brightness meet the third preset condition, adjusting the brightness of the backlight according to the second brightness.

[0030] In this way, when the screen brightness is relatively low, the screen brightness is adjusted in a small range, and the display screen is relatively dark, the brightness of the backlight is adjusted to reduce the brightness jump and improve the user experience.

[0031] In some embodiments, when the brightness of the display screen of the LCD display screen does not meet the first preset condition, the brightness of the backlight is not adjusted, and it is continuously determined whether the brightness of the display screen of the LCD display screen meets the first preset condition, including: when the first brightness meets the second preset condition, the first brightness and the second brightness meet the third preset condition, and the brightness of the display screen of the LCD display screen does not meet the first preset condition, the brightness of the backlight is not adjusted, and it is continuously determined whether the brightness of the display screen of the LCD display screen meets the first preset condition.

[0032] In this way, when the screen brightness is relatively low and the screen brightness is adjusted in a small range, wait for the display screen to be darker before adjusting the brightness to reduce the brightness jump and improve the user experience.

[0033] In a possible implementation, the method further includes: when the first brightness meets the second preset condition, the first brightness and the second brightness meet the third preset condition, and the brightness of the display screen meets the first preset condition, adjusting the brightness of the backlight according to the second brightness.

[0034] In this way, when the screen brightness is relatively high or the brightness adjustment range is large, there is no need to wait for the display screen to be darker, which can shorten the brightness adjustment time and meet the user's need for quickly adjusting the screen brightness.

[0035] In a possible implementation, the backlight driving module includes: a current source unit, the current source unit includes at least one current source, and the at least one current source corresponds to the LED lamp strings in the backlight one by one; adjusting the brightness of the backlight according to the second brightness includes: adjusting the input voltage of each LED lamp string in the backlight according to a first current value and a first preset value; the first current value is the current value corresponding to the LED lamp string at the second brightness; when the current values of all the LED lamp strings satisfy a fourth preset condition, adjusting the current values of all the LED lamp strings through the current sources corresponding to the LED lamp strings until the current values of all the LED lamp strings satisfy a fifth preset condition; the fourth preset condition includes: the absolute value of the difference between the first current value and the current value of the LED lamp string is less than or equal to the first preset value; the fifth preset condition includes: the absolute value of the difference between the first current value and the current value of the LED lamp string is less than or equal to a second preset value, and the second preset value is less than the first preset value.

[0036] The first preset value may correspond to the preset value B in the following text, and the second preset value may correspond to the preset value C in the following text. The current value of the LED lamp string may correspond to the actual lamp string current in the following text, and the first current value may correspond to the adjusted current of the LED lamp string in the following text.

[0037] In this way, the current of the LED lamp string is roughly adjusted by adjusting the output voltage first, and then finely adjusted by the current source. The change of the current adjustment of the current source can be reduced, and the power consumption of the current source can be reduced. In addition, the input voltages corresponding to the LED lamp strings can be different, reducing the power consumption.

[0038] In a second aspect, an embodiment of the present application provides a backlight driving module. The backlight driving module can be used to execute the method described in the first aspect or any possible implementation of the first aspect above.

[0039] In a possible implementation, the backlight driving module includes: a first port and a second port; the first port is used to receive a first instruction from a first chip; the first instruction is used to instruct to adjust the screen brightness of the LCD display screen from a first brightness to a second brightness; the second port is used to receive the brightness information of the display screen, and the brightness information of the display screen comes from the first chip or the timing controller in the LCD display screen.

[0040] The first port and the second port may correspond to the ports in the following text Figure 6 Here, no specific limitation is made. The first chip may correspond to the processor or a chip with the same function in the following text, and no specific limitation is made here.

[0041] In a possible implementation, the second port is specifically configured to receive a first signal; wherein, when the first signal is at a first level, the first signal is used to indicate that the brightness of the display screen meets a first preset condition; when the first signal is at a second level, the first signal is used to indicate that the brightness of the display screen does not meet the first preset condition; the backlight driving module is specifically configured to, when the first signal is at the first level, adjust the brightness of the backlight of the LCD display screen according to a second brightness.

[0042] In a possible implementation, the backlight driving module further includes: a current amplification circuit and a first comparator; the current amplification circuit is configured to collect the current of the LED string and convert it into a voltage signal; the first comparator is configured to compare the voltage signal with a first reference signal and output a second signal; wherein, the first reference signal is determined according to a second preset condition; when the second signal is at a third level, the second signal is used to indicate that a first brightness meets the second preset condition; when the second signal is at a fourth level, the second signal is used to indicate that the first brightness does not meet the second preset condition; the backlight driving module is specifically configured to, when the first signal is at the first level and the second signal is at the third level, adjust the brightness of the backlight according to the second brightness; the backlight driving module is further configured to, when the second signal is at the fourth level, adjust the brightness of the backlight according to the second brightness.

[0043] The backlight driving module may correspond to Figure 7A the backlight driving module shown, and the second signal may correspond to the signal for indicating the determination result in the following text.

[0044] In a possible implementation, the backlight driving module further includes: a register unit and a second comparator; the register unit is configured to store the first brightness; the second comparator is configured to compare the voltage signal corresponding to the first brightness with a second reference signal and output a second signal; wherein, the second reference signal is determined according to a second preset condition; when the second signal is at a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is at a fourth level, the second signal is used to indicate that the first brightness does not meet the second preset condition; the backlight driving module is specifically configured to, when the first signal is at the first level and the second signal is at the third level, adjust the brightness of the backlight of the LCD display screen according to the second brightness; the backlight driving module is further configured to, when the second signal is at the fourth level, adjust the brightness of the backlight of the LCD display screen according to the second brightness.

[0045] The backlight driving module may correspond to Figure 7B the backlight driving module shown.

[0046] In a possible implementation, the backlight driving module further includes: a register unit and an arithmetic circuit; the register unit is configured to store a first brightness and a second brightness; the arithmetic circuit is configured to obtain a third signal according to the first brightness and the second brightness; wherein, when the third signal is at a fifth level, the third signal is used to indicate that the first brightness and the second brightness meet a third preset condition; when the third signal is at a sixth level, the third signal is used to indicate that the first brightness and the second brightness do not meet the third preset condition; the backlight driving module is specifically configured to adjust the brightness of the backlight of the LCD display screen according to the second brightness when the first signal is at a first level and the third signal is at a fifth level; the backlight driving module is further configured to adjust the brightness of the backlight of the LCD display screen according to the second brightness when the third signal is at a sixth level.

[0047] The backlight driving module may correspond to Figure 8 the backlight driving module shown in

[0048] In a possible implementation, the backlight driving module further includes: a register unit, an arithmetic circuit and a second comparator; the register unit is configured to store a first brightness and a second brightness; the second comparator is configured to compare the voltage signal corresponding to the first brightness with a second reference signal and output a second signal; wherein, the second reference signal is determined according to a second preset condition; when the second signal is at a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is at a fourth level, the second signal is used to indicate that the first brightness does not meet the second preset condition; the arithmetic circuit is configured to obtain a third signal according to the first brightness and the second brightness; wherein, when the third signal is at a fifth level, the third signal is used to indicate that the first brightness and the second brightness meet a third preset condition; when the third signal is at a sixth level, the third signal is used to indicate that the first brightness and the second brightness do not meet the third preset condition.

[0049] The backlight driving module is specifically configured to adjust the brightness of the backlight of the LCD display screen according to the second brightness when the first signal is at a first level, the second signal is at a third level, and the third signal is at a fifth level; the backlight driving module is further configured to adjust the brightness of the backlight of the LCD display screen according to the second brightness when the second signal is at a fourth level, or the third signal is at a sixth level.

[0050] The backlight driving module may correspond to Figure 9 the backlight driving module shown in

[0051] In a possible implementation, the backlight driving module further includes: an AND gate circuit; the AND gate circuit is configured to obtain a fifth signal according to a second signal and a third signal; wherein, when the second signal is at a third level and the third signal is at a fifth level, the fifth signal is at an eighth level; when the second signal is at a fourth level or the third signal is at a sixth level, the fifth signal is at a seventh level.

[0052] Specifically, the backlight driving module is configured to adjust the brightness of the backlight of the LCD display screen according to a second brightness when the first signal is at a first level and the fifth signal is at an eighth level; specifically, the backlight driving module is configured to adjust the brightness of the backlight of the LCD display screen according to a second brightness when the fifth signal is at a seventh level.

[0053] The backlight driving module may correspond to Figure 9 the backlight driving module shown.

[0054] In a third aspect, an embodiment of the present application provides a brightness adjustment method. The method can be applied to a first chip and a device including the first chip. The method includes: when the screen brightness of the LCD display screen is a first brightness, obtaining a second brightness in response to a first operation or a change in ambient light intensity; when the brightness of the display screen of the LCD display screen meets a first preset condition, sending a first instruction to the backlight driving module; wherein, the first instruction is used to instruct to adjust the screen brightness of the LCD display screen from the first brightness to the second brightness, and the backlight driving module is used to drive the backlight in the LCD display screen.

[0055] The first preset condition may correspond to preset condition A in the following text. The first brightness may correspond to the screen brightness before adjustment in the following text; the second brightness may correspond to the screen brightness after adjustment. The first brightness and the second brightness are different. The first brightness may be greater than the second brightness or less than the second brightness, and no specific limitation is made here.

[0056] In this way, it is possible to confirm whether to adjust the brightness of the backlight according to the brightness of the display screen. When the display screen of the electronic device is relatively bright, no brightness adjustment is performed; when the display screen of the electronic device is relatively dark, brightness adjustment can be performed to reduce the brightness jump and improve the user experience.

[0057] In some embodiments, the method further includes: when the brightness of the display screen of the LCD display screen does not meet the first preset condition, not sending the first instruction to the backlight driving module, and continuing to determine whether the brightness of the display screen of the LCD display screen meets the first preset condition.

[0058] It can also be understood that when the brightness of the display screen of the LCD display does not meet the first preset condition, the first instruction is not sent until the brightness of the display screen of the LCD display meets the first preset condition. In this way, waiting for the brightness of the display screen to become darker before adjusting the brightness of the backlight can reduce the situation of brightness jump and improve the user experience.

[0059] In a possible implementation, the first preset condition includes: the average brightness of the display screen of the LCD display is less than or equal to the first threshold, or the maximum brightness of the display screen is less than or equal to the second threshold.

[0060] The first threshold can correspond to the brightness threshold A in the following text; the second threshold can correspond to the brightness threshold B in the following text, and no specific limitation is made here.

[0061] In this way, the brightness of the display screen can be characterized by the average brightness or the maximum brightness.

[0062] In a possible implementation, when the brightness of the display screen of the LCD display meets the first preset condition, sending the first instruction to the backlight driving module includes: when the first brightness meets the second preset condition and the brightness of the display screen meets the first preset condition, sending the first instruction to the backlight driving module.

[0063] The second preset condition can correspond to the preset condition B in the following text.

[0064] In this way, when the screen brightness before adjustment does not meet the preset condition B, the brightness judgment of the display screen is not performed, and there is no need to wait for the brightness of the display screen to become darker. The brightness of the backlight can be controlled by the backlight driving module for adjustment, shortening the brightness adjustment time of the backlight and making timely adjustment.

[0065] In some embodiments, when the brightness of the display screen of the LCD display does not meet the first preset condition, the first instruction is not sent to the backlight driving module, and it continues to judge whether the brightness of the display screen of the LCD display meets the first preset condition, including: when the first brightness meets the second preset condition and the brightness of the display screen of the LCD display does not meet the first preset condition, the first instruction is not sent to the backlight driving module, and it continues to judge whether the brightness of the display screen of the LCD display meets the first preset condition.

[0066] In this way, when the brightness of the display screen meets the second preset condition and does not meet the first preset condition, the brightness of the backlight of the LCD display is adjusted until the brightness of the display screen meets the first preset condition. In this way, waiting for the brightness of the display screen to become darker before adjusting the brightness of the backlight can reduce the situation of brightness jump and improve the user experience.

[0067] In a possible implementation, the method further includes: when the first brightness does not meet the second preset condition, sending a first instruction to the backlight driving module.

[0068] In this way, when the brightness is relatively high, the user's sensitivity to brightness is weak, the brightness adjustment time can be shortened, and the brightness can be adjusted in a timely manner.

[0069] In a possible implementation, the second preset condition includes: the first brightness is less than or equal to a third threshold. The third threshold may correspond to threshold A in the following text.

[0070] In a possible implementation, when the brightness of the display screen of the LCD display meets the first preset condition, sending a first instruction to the backlight driving module includes: when the first brightness and the second brightness meet the third preset condition, and the brightness of the display screen of the LCD display meets the first preset condition, sending a first instruction to the backlight driving module.

[0071] The third preset condition may correspond to preset condition C in the following text.

[0072] In this way, when the brightness adjustment range is large, there is no need to wait for the display screen to be darker, the brightness adjustment time can be shortened, and the user's need for quickly adjusting the screen brightness can be met; when the brightness adjustment range is small, wait for the display screen to be darker before adjusting the brightness, reducing the situation of brightness jump and improving the user experience.

[0073] In some embodiments, when the brightness of the display screen of the LCD display does not meet the first preset condition, do not send a first instruction to the backlight driving module, and continue to determine whether the brightness of the display screen of the LCD display meets the first preset condition, including: when the first brightness and the second brightness meet the third preset condition, and the brightness of the display screen of the LCD display does not meet the first preset condition, do not send a first instruction to the backlight driving module, and continue to determine whether the brightness of the display screen of the LCD display meets the first preset condition.

[0074] In this way, when the brightness of the display screen meets the third preset condition and does not meet the first preset condition, adjust the brightness of the backlight of the LCD display until the brightness of the display screen meets the first preset condition. Wait until the brightness of the display screen is darker and then adjust the brightness of the backlight, reducing the situation of brightness jump and improving the user experience.

[0075] In a possible implementation, the method further includes: when the brightness of the display screen does not meet the third preset condition, sending a first instruction to the backlight driving module. In this way, when the brightness adjustment range is large, there is no need to wait for the display screen to be darker, the brightness adjustment time can be shortened, and the user's need for quickly adjusting the screen brightness can be met.

[0076] In a possible implementation, the third preset condition includes: the absolute value of the difference between the first brightness and the second brightness is less than or equal to a fourth threshold. The fourth threshold may correspond to the preset value A described below.

[0077] In a possible implementation, when the brightness of the display screen satisfies the first preset condition, sending a first instruction to the backlight driving module includes: when the brightness of the display screen satisfies the first preset condition, the first brightness satisfies the second preset condition, and the first brightness and the second brightness satisfy the third preset condition, sending a first instruction to the backlight driving module.

[0078] In this way, when the screen brightness is relatively dim, the screen brightness is adjusted in a small range, and the display screen is relatively dim, the brightness of the backlight source is adjusted to reduce the brightness jump and improve the user experience.

[0079] In some embodiments, when the brightness of the display screen of the LCD display does not satisfy the first preset condition, the first instruction is not sent to the backlight driving module, and it is continuously determined whether the brightness of the display screen of the LCD display satisfies the first preset condition, including: when the first brightness satisfies the second preset condition, the first brightness and the second brightness satisfy the third preset condition, and the brightness of the display screen of the LCD display does not satisfy the first preset condition, the first instruction is not sent to the backlight driving module, and it is continuously determined whether the brightness of the display screen of the LCD display satisfies the first preset condition.

[0080] In this way, when the screen brightness is relatively dim and the screen brightness is adjusted in a small range, wait until the display screen is relatively dim before adjusting the brightness to reduce the brightness jump and improve the user experience.

[0081] In a possible implementation, the method further includes: when the first brightness satisfies the second preset condition, the first brightness and the second brightness satisfy the third preset condition, and the brightness of the display screen satisfies the first preset condition, sending a first instruction to the backlight driving module.

[0082] In this way, when the screen brightness is relatively high or the brightness adjustment range is relatively large, there is no need to wait until the display screen is relatively dim, which can shorten the brightness adjustment time and meet the user's need for quickly adjusting the screen brightness.

[0083] In a fourth aspect, an embodiment of the present application provides an LCD display. The display includes: a liquid crystal panel, a backlight source, and a backlight driving module described in the second aspect or any one of the possible implementations of the second aspect. The liquid crystal panel is used to adjust the transmittance of the light emitted by the backlight source; the backlight source is used to emit light; the backlight driving module is used to adjust the intensity of the light emitted by the backlight source.

[0084] Fourth aspect, an embodiment of the present application provides an electronic device, which includes: the LCD display screen described in the second aspect or any possible implementation manner of the second aspect.

[0085] Fifth aspect, an embodiment of the present application provides an electronic device, including a processor and a memory. The memory is used to store code instructions, and the processor is used to run the code instructions to execute the method described in the first aspect or any possible implementation manner of the first aspect, or execute the method described in the third aspect or any possible implementation manner of the third aspect.

[0086] Sixth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction runs on a computer, the computer is enabled to execute the method described in the first aspect or any possible implementation manner of the first aspect, or execute the method described in the third aspect or any possible implementation manner of the third aspect.

[0087] Seventh aspect, an embodiment of the present application provides a computer program product including a computer program. When the computer program runs on a computer, the computer is enabled to execute the method described in the first aspect or any possible implementation manner of the first aspect, or execute the method described in the third aspect or any possible implementation manner of the third aspect.

[0088] Eighth aspect, the present application provides a chip or a chip system. The chip or the chip system includes at least one processor and a communication interface. The communication interface and the at least one processor are interconnected by a line. The at least one processor is used to run a computer program or instruction to execute the method described in the first aspect or any possible implementation manner of the first aspect, or execute the method described in the third aspect or any possible implementation manner of the third aspect. Among them, the communication interface in the chip can be an input / output interface, a pin, a circuit, etc.

[0089] In a possible implementation, the chip or the chip system described above in the present application further includes at least one memory, and instructions are stored in the at least one memory. The memory can be a storage unit inside the chip, such as a register, a cache, etc., or a storage unit of the chip (such as a read-only memory, a random access memory, etc.).

[0090] It should be understood that the second aspect to the eighth aspect of the present application correspond to the technical solutions of the first aspect of the present application. The beneficial effects obtained by each aspect and the corresponding feasible implementation manners are similar and will not be repeated. Description of the Drawings

[0091] Figure 1A schematic diagram of an interface for adjusting the screen brightness provided by an embodiment of the present application;

[0092] Figure 2 A schematic diagram of the structure of a display circuit provided by an embodiment of the present application;

[0093] Figure 3 A schematic diagram of the structure of a current source provided by an embodiment of the present application;

[0094] Figure 4 A schematic diagram of the change in lamp string current and brightness provided by an embodiment of the present application;

[0095] Figure 5 A schematic diagram of the structure of a brightness adjustment circuit provided by an embodiment of the present application;

[0096] Figure 6 A schematic diagram of the structure of a backlight driving module provided by an embodiment of the present application;

[0097] Figure 7A A schematic diagram of the structure of a backlight driving module provided by an embodiment of the present application;

[0098] Figure 7B Another schematic diagram of the structure of a backlight driving module provided by an embodiment of the present application;

[0099] Figure 8 Another schematic diagram of the structure of a backlight driving module provided by an embodiment of the present application;

[0100] Figure 9 Another schematic diagram of the structure of a backlight driving module provided by an embodiment of the present application;

[0101] Figure 10A A schematic diagram of the process flow of a brightness adjustment method provided by an embodiment of the present application;

[0102] Figure 10B Another schematic diagram of the process flow of a brightness adjustment method provided by an embodiment of the present application;

[0103] Figure 11 A schematic diagram of the structure of a voltage adjustment unit provided by an embodiment of the present application;

[0104] Figure 12 Another schematic diagram of the structure of a voltage adjustment unit provided by an embodiment of the present application;

[0105] Figure 13 A timing diagram provided by an embodiment of the present application;

[0106] Figure 14 Another timing diagram provided by an embodiment of the present application;

[0107] Figure 15 A voltage schematic diagram required for each LED string provided by an embodiment of the present application;

[0108] Figure 16 A flowchart of a method for adjusting the brightness of a backlight provided by an embodiment of the present application. Detailed implementation manners

[0109] To facilitate a clear description of the technical solutions of the embodiments of the present application, the following briefly introduces some terms and technologies involved in the embodiments of the present application:

[0110] 1. Liquid crystal display (LCD)

[0111] An LCD is a display that uses liquid crystal light transmittance control technology to achieve colors. The working principle of an LCD is to change the arrangement direction of liquid crystals through an electric current, thereby controlling whether light passes through, and then cooperating with color filters to achieve the purpose of displaying color images.

[0112] In some embodiments, a backlight is provided below the liquid crystal display layer (liquid crystal panel) of the LCD screen, and a color filter is provided above the liquid crystal display layer. The backlight emits a white light source that irradiates into the liquid crystal display layer. The liquid crystal display layer flips the angles of liquid crystal particles through a thin film transistor (TFT) circuit to control the light propagation direction, and cooperates with polarizing plates provided on both sides of the liquid crystal display layer to control the light transmittance into the color filter, and combines the RGB colors printed on the color filter film to form a color image.

[0113] It should be noted that the brightness of the LCD screen depends on the intensity of the white light source provided by the backlight board, or it can be understood that the brightness adjustment of the LCD is usually achieved by controlling the brightness of the backlight.

[0114] Specifically, the brightness of the backlight can be adjusted by changing the current flowing through the light emitting diodes (LEDs) in the backlight, or by using pulse width modulation (PWM) technology to change the light emission of the light emitting diodes in the backlight.

[0115] 2. Other terms

[0116] In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. For example, the first chip and the second chip are only used to distinguish different chips, and do not limit their sequence. Those skilled in the art can understand that the terms "first" and "second" do not limit the quantity and execution order, and the terms "first" and "second" do not necessarily limit to be different.

[0117] It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0118] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (item)" or similar expressions thereof refer to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple. In the embodiments of the present application, an example of an equal implementation of a judgment situation is used for illustration, and the equal situation can also correspond to another judgment situation. No specific limitation is made here.

[0119] 3. Electronic device

[0120] The electronic device according to the embodiments of the present application may include a handheld device with a display function, a vehicle-mounted device, etc. For example, some electronic devices are: mobile phone, tablet computer, handheld computer, laptop computer, mobile internet device (MID), wearable device (such as smart watch, smart glasses, smart bracelet or smart jewelry, etc.), virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication function, computing device or other processing devices connected to a wireless modem, vehicle-mounted device, terminal device in the internet of things (IoT) system, terminal device in a 5G network or terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto.

[0121] The electronic device in the embodiments of the present application may also be referred to as: terminal device, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile platform, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0122] In the embodiments of the present application, an electronic device or each network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also known as main memory). The operating system can be any one or more computer operating systems that implement service processing through processes. For example, the Linux operating system, the Unix operating system, the Android operating system, the iOS operating system, or the Windows operating system, etc. The application layer includes applications such as a browser, an address book, a word processing software, and an instant messaging software.

[0123] Electronic devices such as mobile phones and tablets usually have the function of automatically adjusting the screen brightness. When the ambient brightness around the electronic device is high, the electronic device can automatically increase the screen brightness; when the ambient brightness around the electronic device is low, the electronic device can automatically decrease the screen brightness.

[0124] In addition, the electronic device can also adjust the screen brightness according to the user's operation on the brightness bar. The brightness bar can be understood as a user interface element for displaying and adjusting the screen brightness. The user can adjust the screen brightness by dragging the slider in the brightness bar or clicking on different positions of the brightness bar.

[0125] Exemplarily, Figure 1 FIG. is a schematic diagram of an interface for adjusting the screen brightness provided by the embodiments of the present application. Taking the electronic device as a mobile phone as an example, as Figure 1 shown, after the mobile phone receives the operation of the user's finger sliding down from the top of the display screen in interface 1a, the notification bar interface 1b is displayed.

[0126] The notification bar interface 1b includes: a control center card 101, and the control center card 101 includes a brightness bar 102 and multiple controls. Among them, a slider is set on the brightness bar 102; the multiple controls can include: controls such as WLAN, Bluetooth, mobile data, mute, and auto-rotation.

[0127] When the electronic device receives an operation for indicating to adjust the position of the slider on the brightness bar, the screen brightness of the electronic device is changed according to the position of the slider on the brightness bar. Among them, the position of the slider on the brightness bar can be represented by a percentage. The starting position is 0%, and the corresponding screen brightness is a (the minimum brightness for manual adjustment); the ending position is 100%, and the corresponding screen brightness is b (the maximum brightness for manual adjustment). As Figure 1 shown, the position of the slider on the brightness bar 102 is 70%.

[0128] It can be understood that, in addition to the above horizontal form, the brightness bar can also be in a vertical form or any other form. In the embodiments of the present application, no specific limitations are imposed on the position, form, slider adjustment method, etc. of the brightness bar. In addition, Figure 1 The interface shown is only an example, and the interface of the electronic device may also include more or fewer elements. No specific limitations are imposed here.

[0129] It should be understood that, in addition to automatically adjusting the screen brightness according to the ambient brightness as described above, and Figure 1 adjusting the screen brightness through the brightness bar shown, the electronic device can also adjust the screen brightness in any other way, for example, voice control, etc. No specific limitations are imposed here. It can be understood that the above Figure 1 describes the scenario of adjusting the screen brightness in the notification bar interface, and the screen brightness can also be adjusted in other scenarios. For example, during video playback, the screen brightness can be adjusted by a sliding operation, or the screen brightness can be changed by triggering a key on the display screen. No specific limitations are imposed here.

[0130] However, during the process of adjusting the screen brightness, the user may perceive a stepped change in the screen brightness, resulting in a poor user experience. Especially in the case of low screen brightness, when adjusting the screen brightness, the user is more likely to perceive the change in the screen brightness.

[0131] It should be noted that the screen brightness of the LCD display screen depends on the intensity of the light source provided by the backlight. The intensity of the light source provided by the backlight is usually related to the magnitude of the current flowing through the backlight. In the embodiments of the present application, the brightness of the backlight in the LCD display screen is adjusted to change the screen brightness. Therefore, the process of adjusting the screen brightness can also be understood as the process of adjusting the brightness of the backlight, or the process of adjusting the magnitude of the current flowing through the backlight.

[0132] Exemplarily, Figure 2 is a schematic structural diagram of a display circuit provided by an embodiment of the present application. As Figure 2 shown, the display circuit includes: a backlight driving module 201 and a backlight 202. Among them, the backlight driving module 201 includes: a voltage adjustment unit 201a, a control unit 201b, and a current source unit 201c.

[0133] The input end of the voltage adjustment unit 2a is used to connect to the battery; the output end of the voltage adjustment unit 201a is connected to the output end of the backlight 202; the output end of the backlight 202 is connected to the current source unit 201c.

[0134] In the embodiments of the present application, the backlight 202 may include: one or more LED lamp strings 202a. The current source unit 2c includes one or more current sources 2a. In some embodiments, the current sources may correspond to the LED lamp strings 202a one by one.

[0135] Figure 2 Among them, the voltage adjustment unit 201a is used to adjust the voltage output by the battery to a suitable voltage to supply power to the LED lamp string (which can also be simply referred to as the lamp string). The control unit 201b is used to confirm the adjusted current of the LED lamp string according to the adjusted screen brightness in the brightness modification instruction from the processor.

[0136] The control unit 201b transmits the adjusted current of the LED lamp string to the current source unit.

[0137] The current source unit 201c is used to control the magnitude of the current flowing through the backlight according to the adjusted current of the LED lamp string. The current source unit 201c can also control the adjustment of the output voltage of the voltage adjustment unit 201a according to the adjusted current of the LED lamp string.

[0138] In some embodiments, the current source unit 201c can adjust the current of the backlight 202 by adjusting the conduction state of the switching transistor of the current source.

[0139] It should be noted that the conduction state of the switching transistor (such as on or off, on-resistance, etc.) can be changed by adjusting the voltage applied to the control terminal of the switching transistor, thereby changing the current flowing through the switching transistor and the current flowing through the current source. It can be understood that when the switching transistor operates in the linear region, the resistance value between the first end and the second end of the switching transistor can change with the voltage of the control terminal. The linear region in the switching transistor can also be called the non-saturation region, the resistance variable region, the variable resistance region, etc. The specific name of the linear region in the embodiments of the present application is not limited.

[0140] Exemplarily, Figure 3 is a schematic structural diagram of a current source provided by an embodiment of the present application. As Figure 3 shown, the current source 2a includes: a switching transistor S1, a switching transistor S2, a switching transistor S3, and a switching transistor S4. One end of the switching transistor S1, one end of the switching transistor S2, one end of the switching transistor S3, and one end of the switching transistor S4 are all connected to the LED lamp string 202a; the other end of the switching transistor S1, the other end of the switching transistor S2, the other end of the switching transistor S3, and the other end of the switching transistor S4 are all grounded; the control terminals (such as the G pole) of the switching transistors S1 to S4 are all controlled by the control circuit in the current source unit 201c; this control circuit is used to drive each current source in the current source unit 201c to perform current adjustment.

[0141] In the embodiments of the present application, the current ranges corresponding to the switching transistors S1 to S4 are different, and the adjustment precision of the current is different. Exemplarily, the current range corresponding to the switching transistor S1 is 0 - 10 mA, and the adjustment precision can be 0.1 mA; the current range corresponding to the switching transistor S2 is 0 - 5 mA, and the adjustment precision can be 0.05 mA; the current range corresponding to the switching transistor S3 is 0 - 2.5 mA, and the adjustment precision can be 0.025 mA; the current range corresponding to the switching transistor S4 is 0 - 1.25 mA, and the adjustment precision can be 0.0125 mA.

[0142] It can be understood that Figure 3 in the circuit shown, the current flowing through the current source 2a can be understood as the sum of the currents flowing through the switching transistors S1 to S4. By adjusting the conduction states of the switching transistors S1 to S4, the current flowing through the current source can be adjusted, and further the current of the LED string can be adjusted.

[0143] However, during the process of adjusting the screen brightness, the situation of brightness jump may occur.

[0144] Exemplarily, Figure 4 is a schematic diagram of the current and brightness change of a lamp string provided by an embodiment of the present application. Taking the current source as Figure 3 shown, and taking the lamp string current Iled changing from 0 mA to 2.5 mA as an example.

[0145] From Figure 4 it can be seen that when the lamp string current is 1.25 mA, the lamp string brightness jumps.

[0146] Based on Figure 3 the circuit analysis shown, when the lamp string current is less than 1.25 mA, the switching transistor S4 is turned on, and the switching transistors S1, S2, and S3 are all turned off. When the lamp string current is between 1.25 mA and 2.5 mA, the switching transistor S3 is turned on, and the switching transistors S1, S2, and S4 are all turned off. Therefore, when the lamp string current is 1.25 mA, the switching transistor through which the current source is turned on is switched. Specifically, the current source switches from the switching transistor S4 being turned on and the switching transistor S3 being turned off to the switching transistor S4 being turned off and the switching transistor S3 being turned on.

[0147] It should be noted that due to differences in manufacturing processes, materials, etc., the characteristic parameters (such as on-resistance, current gain, etc.) corresponding to different switching transistors are different. Therefore, when switching the switching transistor that is turned on, it may cause a sudden change in the brightness of the LED lamp string.

[0148] In view of this, the embodiments of the present application provide a brightness adjustment method, a backlight driving module, an electronic device, and a storage medium. When the display screen of the electronic device is relatively bright, the brightness is not adjusted; when the display screen of the electronic device is relatively dark, the brightness can be adjusted.

[0149] It should be noted that the screen brightness perceived by the user is related not only to the brightness of the backlight source but also to the light transmittance of the liquid crystal layer. And the light transmittance of the liquid crystal layer is positively correlated with the brightness of the display screen. Therefore, when the display screen is darker, the light transmittance is poorer; when the display screen is darker, the light transmittance is poorer.

[0150] In this way, when the display screen is darker, the light received by the user's eyes from the display screen is generally weaker. Therefore, before and after the screen brightness is adjusted, the change in the light received by the user's eyes is small, making it difficult for the user to perceive the change in the screen brightness and improving the user experience.

[0151] Exemplarily, Figure 5 FIG. is a schematic structural diagram of a brightness adjustment circuit provided by an embodiment of the present application. As Figure 5 shown, the circuit includes: a processor 501, a backlight driving module 502, and a backlight source 503.

[0152] The processor 501 is configured to transmit a brightness modification instruction to the backlight driving module 502. The instruction includes: the adjusted screen brightness.

[0153] The backlight driving module 502 is configured to confirm whether to delay the brightness adjustment according to the brightness of the display screen and a preset condition A.

[0154] Specifically, when the brightness of the display screen meets the preset condition A, the current of the backlight source 503 is adjusted according to the adjusted screen brightness in the brightness modification instruction. When the brightness of the display screen does not meet the preset condition A, the brightness adjustment is delayed until the brightness of the display screen meets the preset condition A, and the current of the backlight source 503 is adjusted according to the adjusted screen brightness in the brightness modification instruction.

[0155] In this way, it is possible to confirm whether to delay the adjustment of the screen brightness according to the brightness of the display screen. When the display screen is darker, the screen brightness is adjusted to reduce the situation where the user perceives a sudden change in the screen brightness and improve the user experience.

[0156] The preset condition A may include: the average brightness of the display screen is less than or equal to the brightness threshold A, or the maximum brightness of the display screen is less than or equal to the brightness threshold B. In this way, the brightness of the display screen can be confirmed by the average brightness or the highest brightness of the display screen.

[0157] In some embodiments, the brightness of the display screen may be represented by the gray value of the pixels. Exemplarily, the brightness of the display screen may be represented by the average gray value of all the pixels in the screen. Taking the brightness of the screen represented by the gray value of the pixels as an example, the brightness threshold A may be 100, 50 or any value; the brightness threshold B may be 168, 150 or any value. No specific limitation is made here.

[0158] In the embodiments of the present application, the backlight driving module 502 may include: a voltage adjustment unit 502a, a control unit 502b, and a current source unit 502c. Among them, the functions and structures of the voltage adjustment unit 502a, the control unit 502b, and the current source unit 502c are similar to those of the voltage adjustment unit 201a, the control unit 201b, and the current source unit 201c described above. Specifically, reference may be made to the corresponding descriptions above, and details are not elaborated herein. The current source unit 201c may also confirm the preset voltage corresponding to the LED string according to the adjusted LED string current; the voltage adjustment unit adjusts the voltage of the output terminal corresponding to the LED string according to the preset voltage.

[0159] Exemplarily, Figure 6 is a schematic structural diagram of a backlight driving module 502 provided by an embodiment of the present application. As Figure 6 shown, the backlight driving module 502 includes: a port 3a and a port 3b.

[0160] The port 3a is used to receive a brightness modification instruction from the processor 501. The brightness modification instruction may be generated by the processor 501 in response to an operation for indicating adjustment of the screen brightness or after detecting a change in the ambient brightness.

[0161] The operation for indicating adjustment of the screen brightness may be an operation of a user sliding a slider on the brightness bar, a voice operation for adjusting the screen brightness, or any operation indicating brightness adjustment, etc., which is not specifically limited herein.

[0162] The port 3a may be an I2C port or any other port that can achieve the same function. This is not specifically limited herein.

[0163] The port 3b is used to receive a first signal. The first signal is used to indicate the brightness of the display screen. When the display screen meets the preset condition A, the first signal is level one; when the display screen does not meet the preset condition A, the first signal is level two. The port 3b may be a GPIO port or any other port that can achieve the same function. This is not specifically limited herein. The port 3b may be connected to the current source unit 502c.

[0164] Level one and level two are different. Taking level one being higher than level two as an example, level one may be a high level and level two may be a low level; or, taking level one being lower than level two as an example, level one may be a low level and level two may be a high level, which is not specifically limited herein. The embodiments of the present application do not specifically limit the values of level one and level two.

[0165] The first signal can come from the processor 501 or from the timing controller (Tcon) of the LCD display screen. The timing controller can also be referred to as a display controller, display chip, graphics card, etc. There is no specific limitation here.

[0166] Taking the first signal coming from the processor 501 as an example. The processor 501 can calculate in real time the brightness of the display screen (display panel). When the brightness of the display screen meets the preset condition A, it is considered that the display content of the screen is dim at this time, and the first signal is level two. Otherwise, it is considered that the display content of the screen is bright at this time, and the first signal is level one.

[0167] It can be understood that the Tcon can receive the image data from the processor 501 and convert it into the driving signals (such as synchronization signals, vertical synchronization signals, clock signals, etc.) required by the liquid crystal layer (which can also be called the liquid crystal panel) of the LCD display screen.

[0168] In some embodiments, the control unit 502b is used to output a driving signal A to the current source unit 502c according to the brightness modification instruction. The driving signal A is used to drive the current source unit 502c to perform current adjustment. The driving signal A can be used to indicate the adjusted LED current. After receiving the driving signal A, the current source unit 502c confirms whether to perform brightness adjustment according to the first signal transmitted through port 3b.

[0169] The following combines Figure 5 and Figure 6 to illustrate the brightness adjustment process.

[0170] After detecting a change in the ambient brightness or receiving an operation instruction for indicating the adjustment of the screen brightness, the processor 501 transmits a brightness modification instruction to the control unit 502b in the backlight driving module 502.

[0171] The control unit 502b can obtain the driving signal A according to the brightness modification instruction. The driving signal A includes: the current of the adjusted LED string.

[0172] The current source unit 502c can obtain the brightness of the display screen from the processor 501 or the timing controller. When the brightness of the display screen meets the preset condition, the control unit 502b adjusts the current flowing through the backlight source according to the driving signal A, and controls the voltage adjustment unit to adjust its output voltage.

[0173] In some embodiments, the backlight driving module can confirm whether to delay the adjustment of the screen brightness according to the brightness of the display screen when the screen brightness before adjustment meets the preset condition B; when the screen brightness before adjustment does not meet the preset condition B, it does not perform the brightness judgment of the display screen and can adjust the screen brightness.

[0174] The preset condition B is used to indicate that the screen brightness before adjustment is less than the threshold A. Taking the screen brightness expressed as a percentage of the maximum screen brightness as an example, the threshold A can be 30%, 15% or any value, which is not specifically limited here. Taking the maximum brightness of the screen as 500 nit as an example, the threshold A can be 150 nit, 200 nit or any value. Taking the screen brightness expressed by the brightness level as an example, the threshold A can be the brightness level corresponding to 150 nit, the brightness level corresponding to 200 nit, or any value, which is not specifically limited here. The embodiments of the present application do not limit the specific value of the threshold A.

[0175] It can be understood that, generally, when the screen brightness is low, since the human eye is easily aware of the change in the screen brightness, the dimming accuracy requirement of the terminal device is relatively high. When the screen brightness is high, due to sufficient light, the human eye is not easily aware of the change in the screen brightness.

[0176] It can be understood that, in addition to the above method, it is also possible to confirm whether the screen brightness before adjustment meets the preset condition B by the current of the LED string before adjustment.

[0177] In some embodiments, the backlight driving module can confirm by itself whether the preset condition C is met.

[0178] In a possible implementation manner 1, the backlight driving module can confirm whether the screen brightness before adjustment meets the preset condition B by the current of the LED string before adjustment.

[0179] Exemplarily, Figure 7A is a schematic structural diagram of a backlight driving module provided by an embodiment of the present application. As Figure 7A shown, the backlight driving module includes: a current sampling circuit 701 and a comparator 702.

[0180] The current sampling circuit 701 is used to represent the current of the LED string through an analog voltage signal. Exemplarily, the current sampling circuit 701 may include: a resistor R1 and a comparator U1. Among them, the resistor R1 is located between the LED string and the current source. The two input terminals of the comparator U1 are respectively connected to both sides of the resistor R1. The comparator U1 can obtain the voltage across the resistor R1, and thus obtain the current of the LED string.

[0181] The comparator 702 is used to output a determination result of the screen brightness by comparing the analog voltage signal with a reference voltage Vref1. The reference voltage Vref1 is determined by the above threshold A.

[0182] The current source unit can confirm whether to perform brightness adjustment according to the first signal.

[0183] When the first signal is at level one, brightness adjustment is performed. When the first signal is at level two, brightness adjustment is not performed until the first signal becomes level one and then brightness adjustment is carried out.

[0184] When the analog voltage signal is greater than or equal to the reference voltage Vref, the determination result is level three, indicating that the screen brightness does not meet the preset condition B; when the analog voltage signal is less than Vref, the determination result is level four, indicating that the screen brightness meets the preset condition B.

[0185] Level three and level four are different. Taking level three being higher than level four as an example, level three can be a high level and level four can be a low level; or, taking level three being lower than level four as an example, level three can be a low level and level four can be a high level. No specific limitation is made here. The embodiments of the present application do not make specific limitations on the values of level three and level four.

[0186] In this way, the judgment of the preset condition B can be realized through a simple circuit, and the method is simple and easy to implement.

[0187] In the second possible implementation manner, it is judged whether the preset condition B is met by the current backlight brightness value.

[0188] Exemplarily, Figure 7B is a schematic structural diagram of another backlight driving module provided by the embodiments of the present application. As Figure 7B shown, the backlight driving module includes: a register unit 703 and a comparator 704.

[0189] The register unit 703 stores the current backlight brightness value (which can also be understood as the backlight brightness value before adjustment). The comparator 704 can compare the voltage corresponding to the current backlight brightness value with the reference voltage Vref2 and output the determination result of the screen brightness. The reference voltage Vref2 is determined by the above-mentioned threshold A.

[0190] The current source unit can confirm whether to perform brightness adjustment according to the determination result and the first signal.

[0191] When the determination result is level three and the first signal is level one, brightness adjustment is performed. When the signal A is level four, brightness adjustment is performed. When the determination result is level three and the first signal is level two, brightness adjustment is not performed until the first signal becomes level one and then brightness adjustment is carried out.

[0192] In some other embodiments, the backlight driving module can receive the above determination result. The determination result can come from a processor or a timing controller of an LCD display screen. No specific limitation is made here.

[0193] Based on the above embodiments, the backlight driving module can also confirm whether to adjust the brightness according to the brightness of the display screen according to the adjustment range of the screen brightness.

[0194] Specifically, when the screen brightness before and after adjustment meets the preset condition C, it is confirmed whether to delay the brightness adjustment according to the brightness of the display screen; when the screen brightness before and after adjustment does not meet the preset condition C, the judgment of delaying the brightness adjustment is not performed, and the brightness adjustment can be performed.

[0195] In some embodiments, the preset condition C includes: the absolute value of the difference between the screen brightness before and after adjustment is less than the preset value A. Taking the screen brightness expressed as a percentage of the maximum screen brightness as an example, the preset value A can be 10%, 5% or any value, which is not specifically limited here. Taking the maximum brightness of the screen as 500 nit as an example, the preset value A can be 50 nit, 10 nit or any value. Taking the screen brightness expressed by the brightness level as an example, the preset value A can be the brightness level corresponding to 10 nit, the brightness level corresponding to 500 nit, or any value, which is not specifically limited here. The specific value of the preset value in the embodiments of the present application is not limited.

[0196] In other embodiments, the screen brightness can be divided into multiple intervals, and the preset condition C includes: the screen brightness before and after adjustment is within the same interval. Exemplarily, taking the screen brightness expressed as a percentage of the maximum screen brightness as an example, the screen brightness can be divided into 3 intervals such as 0 to 15%, 15% to 40%, and 40% to 100%. When the screen brightness before and after adjustment is within the range of 0 to 15% interval, the preset condition C is met. When the screen brightness before adjustment is between 40% and 100% and the screen brightness after adjustment is between 0 and 15%, the preset condition C is not met. The preset condition C in the embodiments of the present application is not specifically limited.

[0197] In this way, in the case of a large brightness adjustment range, there is no need to wait for the display screen to be darker, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness; in the case of a small brightness adjustment range, wait for the display screen to be darker before adjusting the brightness, reducing the situation of brightness jump and improving the user experience.

[0198] In some embodiments, the backlight driving module can confirm by itself whether the preset condition C is met.

[0199] Exemplarily, Figure 8 is a schematic structural diagram of a backlight driving module provided by an embodiment of the present application. As Figure 8 shown, the backlight driving module includes: a register unit 801 and an arithmetic circuit 802.

[0200] The register unit 801 stores the current backlight brightness value (which can also be understood as the backlight brightness value before adjustment), and the to-be-executed backlight brightness value (which can also be referred to as the adjusted screen brightness value, adjusted screen brightness, etc.).

[0201] The arithmetic circuit 802 can obtain signal B based on the voltage corresponding to the current backlight brightness value and the voltage corresponding to the to-be-executed backlight brightness value.

[0202] Exemplarily, as Figure 8 shown, the arithmetic circuit 802 may include: subtraction circuit 81, subtraction circuit 82, comparator 83, comparator 84, and AND gate circuit 85.

[0203] The subtraction circuit 81 can calculate the difference between the voltage corresponding to the current backlight brightness value and the voltage corresponding to the to-be-executed backlight brightness value to obtain the difference voltage A. The comparator 83 can compare the difference voltage A with the reference voltage Vref3 to obtain the comparison signal 1.

[0204] The subtraction circuit 82 can calculate the difference between the voltage corresponding to the to-be-executed backlight brightness value and the voltage corresponding to the current backlight brightness value to obtain the difference voltage B. The comparator 84 can compare the difference voltage B with the reference voltage Vref3 to obtain the comparison signal 2.

[0205] The AND gate circuit 85 can obtain signal B based on the comparison signal 1 and the comparison signal 2.

[0206] Exemplarily, when the difference voltage A is less than or equal to the reference voltage Vref3, the comparison signal 1 is at a high level; when the difference voltage A is greater than the reference voltage Vref3, the comparison signal 1 is at a low level. When the difference voltage B is less than or equal to the reference voltage Vref3, the comparison signal 2 is at a high level; when the difference voltage B is greater than the reference voltage Vref3, the comparison signal 2 is at a low level.

[0207] When both the comparison signal 1 and the comparison signal 2 are at a high level, a high-level signal B is output, indicating that the screen brightness before and after adjustment meets the preset condition C; when the comparison signal 1 or the comparison signal 2 is at a low level, a low-level signal B is output, indicating that the screen brightness before and after adjustment does not meet the preset condition C.

[0208] Exemplarily, when the difference voltage A is less than or equal to the reference voltage Vref3, the comparison signal 1 is at a low level; when the difference voltage A is greater than the reference voltage Vref3, the comparison signal 1 is at a high level. When the difference voltage B is less than or equal to the reference voltage Vref3, the comparison signal 2 is at a low level; when the difference voltage B is greater than the reference voltage Vref3, the comparison signal 2 is at a high level.

[0209] When both comparison signal 1 and comparison signal 2 are at low level, output signal B at low level, indicating that the screen brightness before and after adjustment meets the preset condition C; when comparison signal 1 or comparison signal 2 is at high level, output signal B at high level, indicating that the screen brightness before and after adjustment does not meet the preset condition C.

[0210] The structure of the arithmetic circuit 802 shown in the above embodiment is only an example and can also be replaced by any other structure that can achieve the same function, and no specific limitation is made here. The embodiments of the present application do not specifically limit the structure of the arithmetic circuit 802.

[0211] The current source unit can confirm whether to perform brightness adjustment according to signal B and the first signal.

[0212] When signal B indicates that the screen brightness before and after adjustment meets the preset condition C and the first signal is at level one, perform brightness adjustment. When signal B indicates that the screen brightness before and after adjustment does not meet the preset condition C, perform brightness adjustment. When signal B indicates that the screen brightness before and after adjustment meets the preset condition C and the first signal is at level two, do not perform brightness adjustment until the first signal becomes level one and then perform brightness adjustment.

[0213] In some other embodiments, the backlight driving module can receive signal B. Signal B is used to indicate whether the screen brightness before and after adjustment meets the preset condition C. Exemplarily, when signal B is at level five, it indicates that the screen brightness before and after adjustment meets the preset condition C; when signal B is at level six, it indicates that the screen brightness before and after adjustment does not meet the preset condition C. Signal B can come from a processor or a timing controller of an LCD display screen. No specific limitation is made here.

[0214] Level five and level six are different. Taking level five being higher than level six as an example, level five can be at high level and level six can be at low level; or, taking level five being lower than level six as an example, level five can be at low level and level six can be at high level. No specific limitation is made here. The embodiments of the present application do not specifically limit the values of level five and level six.

[0215] Specifically, the backlight driving module further includes: a port for receiving signal B. The backlight driving module can confirm whether to adjust the screen brightness through the first signal and signal B.

[0216] Specifically, when signal B is at level five and the first signal is at level one, output a signal for indicating to adjust the screen brightness; when signal B is at level six or the first signal is at level two, output a signal for indicating not to adjust the screen brightness.

[0217] In this way, the judgment of preset condition A and preset condition C can be realized through a simple circuit, and the method is simple and easy to implement.

[0218] The embodiments of the present application do not limit the specific circuit implementation of the backlight driving module.

[0219] It can be understood that the above embodiments illustrate the situation of determining whether to adjust the brightness through the judgment of two preset conditions (for example, preset condition A and preset condition B, and preset condition A and preset condition C). It is also possible to determine whether to adjust the brightness through the judgment of 3 preset conditions.

[0220] Exemplarily, when preset condition A, preset condition B, and preset condition C are satisfied, the brightness can be adjusted; when preset condition B is not satisfied or preset condition C is not satisfied, the brightness can be adjusted. When preset condition B and preset condition C are not satisfied, and preset condition A is not satisfied, no adjustment is made until the display screen satisfies preset condition A and then the brightness is adjusted.

[0221] In this way, when the brightness adjustment range is large or the screen brightness is high, there is no need to wait for the display screen to be darker, which can shorten the brightness adjustment time and meet the user's need for quickly adjusting the screen brightness; when the brightness adjustment range is small, wait for the display screen to be darker before adjusting the brightness, reducing the situation of brightness jump and improving the user experience.

[0222] Exemplarily, Figure 9 is a schematic structural diagram of a backlight driving unit provided by an embodiment of the present application. As Figure 9 shown, the backlight driving module includes: a register unit 901, a comparator 902, an arithmetic circuit 903, and an AND gate circuit 904.

[0223] The register unit 901 and the arithmetic circuit 903 can refer to the descriptions of the corresponding devices above Figure 8 and will not be elaborated here in detail. The comparator 902 can refer to the descriptions of the corresponding devices above Figure 7B and will not be elaborated here in detail.

[0224] The AND gate circuit 904 is used to output signal A according to the determination result and signal B. When signal A is at the seventh level, it is used to indicate whether to adjust the screen brightness according to the first signal. When signal A is at the eighth level, it is used to indicate adjusting the screen brightness.

[0225] The seventh level is different from the eighth level. Taking the seventh level being higher than the eighth level as an example, the seventh level can be a high level and the eighth level can be a low level; or, taking the seventh level being lower than the eighth level as an example, the seventh level can be a low level and the eighth level can be a high level, which is not specifically limited here. The embodiments of the present application do not specifically limit the values of the seventh level and the eighth level.

[0226] The current source unit can confirm whether to adjust the brightness according to signal A and the first signal.

[0227] When the signal A is at the seventh level and the first signal is at level one, brightness adjustment is performed. When the signal A is at level eight, brightness adjustment is performed. When the signal A is at the seventh level and the first signal is at level two, brightness adjustment is not performed until the first signal becomes at level one and then brightness adjustment is performed.

[0228] The structures of the respective circuits in the above embodiments are only examples and are not specifically limited.

[0229] In the above embodiments, in addition to the above manner, the backlight driving module may also confirm the screen brightness before adjustment in any other manner (for example, the brightness value stored in the register), etc. This is not specifically limited here.

[0230] In the above embodiments, the backlight driving module may obtain the first signal and the signal B from the processor and make a judgment based on the two signals. In some embodiments, the processor may also control whether to perform brightness adjustment through one signal when the preset condition A and the preset condition C are satisfied. The processor may also control whether to perform brightness adjustment through one signal when the preset condition A, the preset condition B, and the preset condition C are satisfied. The embodiments of the present application do not specifically limit the number of signals transmitted by the processor to the backlight driving module.

[0231] The structure of the display circuit is described in the above embodiments. Next, in combination with Figure 10A the brightness adjustment method provided in the embodiments of the present application will be described. Exemplarily, Figure 10A is a schematic flowchart of a brightness adjustment method provided in the embodiments of the present application. As Figure 10A shown, the method includes:

[0232] S1001. The backlight driving module receives a brightness modification instruction. The instruction includes: the adjusted screen brightness.

[0233] S1002. The backlight driving module confirms whether the screen brightness before adjustment meets the preset condition B.

[0234] The preset condition B may refer to the corresponding description above and will not be elaborated in detail here. Taking the confirmation of the screen brightness before adjustment by the LED string current value as an example, the preset condition B may be that the LED string current value is less than the reference current. Taking the circuit structure shown above Figure 7A as an example, the preset condition B is that the voltage across the resistor R1 is less than the reference voltage Vref1. The embodiments of the present application do not limit the specific form of the preset condition B.

[0235] When the screen brightness before adjustment does not meet the preset condition B, S1005 is executed. When the screen brightness before adjustment meets the preset condition B, S1003 is executed.

[0236] It is understandable that when the preset condition C is satisfied, the confirmed brightness is modified to an extremely low brightness scenario (which can also be referred to as a low brightness scenario), and when the preset condition C is not satisfied, the confirmed brightness is modified to a non-extremely low scenario (which can also be referred to as a high brightness scenario).

[0237] In this way, when the screen brightness is relatively high, the brightness can be directly adjusted; when the screen brightness is relatively low, wait until the display screen is darker before adjusting the brightness, reducing the situation of brightness jump and improving the user experience.

[0238] In some embodiments, S1002 may not be executed either.

[0239] S1003. The backlight driving module confirms whether the screen brightness before and after adjustment meets the preset condition C.

[0240] The preset condition C can refer to the corresponding description above and will not be elaborated in detail here. Exemplarily, the preset condition C can be that the absolute value of the difference between the brightness value of the LED string after adjustment and the brightness value of the LED string before adjustment is less than the preset value A.

[0241] When the screen brightness before and after adjustment does not meet the preset condition C, S1005 is executed. When the screen brightness before and after adjustment meets the preset condition C, S1004 is executed.

[0242] It is understandable that when the preset condition C is satisfied, the confirmed brightness is modified to a fine-tuning scenario (small-range adjustment), and when the preset condition C is not satisfied, the confirmed brightness is modified to a non-fine-tuning scenario (large-range adjustment).

[0243] In this way, when the brightness adjustment range is large, there is no need to wait until the display screen is darker, which can shorten the brightness adjustment time and meet the user's need for quickly adjusting the screen brightness; when the brightness adjustment range is small, wait until the display screen is darker before adjusting the brightness, reducing the situation of brightness jump and improving the user experience.

[0244] In some embodiments, S1003 may not be executed either.

[0245] Exemplarily, taking Figure 8 the shown circuit as an example, the backlight driving module can confirm whether the screen brightness before and after adjustment meets the preset condition C through the signal transmitted by port 3d.

[0246] S1004. The backlight driving module confirms whether the brightness of the display screen meets the preset condition A.

[0247] The preset condition A can refer to the corresponding description above and will not be elaborated in detail here.

[0248] When the display screen meets the preset condition A, execute S1005. When the display screen does not meet the preset condition A, continue to execute S1014 until the display screen meets the preset condition A and then execute S1005.

[0249] In this way, when the display screen is relatively dim, the screen brightness is adjusted to reduce the situation where the user perceives a sudden change in screen brightness and improve the user experience.

[0250] Exemplarily, taking the circuit shown in the above embodiment as an example, the backlight driving module can confirm whether the brightness of the display screen meets the preset condition A through the signal transmitted by port 3b.

[0251] S1005: Perform brightness adjustment.

[0252] In summary, when the display screen of the electronic device is relatively bright, no brightness adjustment is performed to reduce the situation of sudden brightness change; when the display screen of the electronic device is relatively dim, brightness adjustment can be performed so that the user can hardly perceive the change in screen brightness and improve the user experience.

[0253] The above Figures 6 to 10A In the above-described embodiments, it is described from the perspective of the backlight driving module to confirm whether the preset conditions (preset condition A, preset condition B, preset condition C) are met. In some other embodiments, the processor can also confirm whether to issue a brightness modification instruction to the backlight driving module when the preset conditions (preset condition A, preset condition B, preset condition C) are met.

[0254] In some embodiments, taking preset condition A as an example, when the preset condition A is met, a brightness modification instruction is issued; when the preset condition A is not met, it continues to be judged whether the preset condition A is met.

[0255] Taking preset condition A and preset condition B as examples, the processor can issue a brightness modification instruction when preset condition B is not met; the processor can confirm whether preset condition A is met when preset condition B is met; when preset condition A is met, a brightness modification instruction is issued; when preset condition A is not met, it continues to be judged whether the preset condition A is met.

[0256] Taking preset condition A and preset condition B as examples, the processor can issue a brightness modification instruction when preset condition B is not met; the processor can confirm whether preset condition A is met when preset condition B is met; when preset condition A is met, a brightness modification instruction is issued; when preset condition A is not met, it continues to be judged whether the preset condition A is met.

[0257] Taking three preset conditions as an example, the processor can issue a brightness modification instruction when dissatisfied with preset condition B or when preset condition C is not met; the processor can confirm whether preset condition A is met when preset condition B is met and preset condition C is met; when preset condition A is met, issue a brightness modification instruction; when preset condition A is not met, continue to determine whether preset condition A is met.

[0258] Exemplarily, Figure 10B is a schematic flowchart of another brightness adjustment method provided by this application. As Figure 10B shown, the method includes:

[0259] S1011. The processor receives an operation for indicating screen brightness adjustment or detects a change in ambient light to obtain a second brightness;

[0260] S1012. The processor confirms whether the screen brightness before adjustment meets preset condition B.

[0261] Preset condition B can refer to the corresponding description above and will not be elaborated here in detail. Taking the confirmation of the screen brightness before adjustment through the LED string current value as an example, preset condition B can be that the LED string current value is less than the reference current.

[0262] If the screen brightness before adjustment does not meet preset condition B, execute S1015. If the screen brightness before adjustment meets preset condition B, execute S1013.

[0263] In this way, when the screen brightness is high, the brightness can be directly adjusted; when the screen brightness is low, wait until the display screen is darker before adjusting the brightness, reducing the situation of brightness jump and improving the user experience.

[0264] In some embodiments, S1012 may not be executed either.

[0265] S1013. The processor confirms whether the screen brightness before and after adjustment meets preset condition C.

[0266] Preset condition C can refer to the corresponding description above and will not be elaborated here in detail. Exemplarily, preset condition C can be that the absolute value of the difference between the brightness value of the LED string after adjustment and the brightness value of the LED string before adjustment is less than preset value A.

[0267] If the screen brightness before and after adjustment does not meet preset condition C, execute S1015. If the screen brightness before and after adjustment meets preset condition C, execute S1014.

[0268] In this way, in the case of a large brightness adjustment range, there is no need to wait for the display screen to be darker, which can shorten the brightness adjustment time and meet the user's need for quickly adjusting the screen brightness; in the case of a small brightness adjustment range, wait for the display screen to be darker before adjusting the brightness, reducing the situation of brightness jump and enhancing the user experience.

[0269] In some embodiments, S1013 may not be executed.

[0270] Exemplarily, taking Figure 8 the circuit shown as an example, the backlight driving module can confirm whether the screen brightness before and after adjustment meets the preset condition C through the signal transmitted by port 3d.

[0271] S1014. The processor confirms whether the brightness of the display screen meets the preset condition A.

[0272] The preset condition A can refer to the corresponding description above and will not be elaborated here in detail.

[0273] When the display screen meets the preset condition A, execute S1015. When the display screen does not meet the preset condition A, continue to execute S1014 until the display screen meets the preset condition A and then execute S1015.

[0274] In this way, when adjusting the screen brightness in the case of a darker display screen, the situation where the user perceives the screen brightness jump is reduced, enhancing the user experience.

[0275] Exemplarily, taking the circuit shown in the above embodiment as an example, the backlight driving module can confirm whether the brightness of the display screen meets the preset condition A through the signal transmitted by port 3b.

[0276] In some embodiments, if S1012 is not executed, when the preset condition C is met, the brightness modification scenario can be adjusted to the fine-tuning scenario, and when the preset condition C is not met, the brightness modification scenario is adjusted to the non-fine-tuning scenario. In this way, the scenarios are distinguished, which is convenient for subsequent judgment on whether to continue executing S1014 and reduces the situation of repeated execution of S1013.

[0277] If S1012 is executed, when the preset condition B and the preset condition C are met, the brightness modification scenario can be adjusted to the fine-tuning scenario, distinguishing the scenarios, which is convenient for subsequent judgment on whether to continue executing S1014. In this way, the scenarios are distinguished, which is convenient for subsequent judgment on whether to continue executing S1014 and reduces the situation of repeated execution of S1012 and S1013.

[0278] It should be understood that the processor can confirm whether it is a fine-tuning scenario through the value of the register. The fine-tuning scenario and the non-fine-tuning scenario can correspond to different values of the same register. Exemplarily, the value of the register corresponding to the fine-tuning scenario can be 1, and the value of the register corresponding to the non-fine-tuning scenario can be 2. There is no specific limitation here.

[0279] S1015. The processor transmits a brightness modification instruction to the backlight driving module.

[0280] S1016. The backlight driving module performs brightness adjustment.

[0281] In summary, when the display screen of the electronic device is relatively bright, no brightness adjustment is performed to reduce the brightness jump; when the display screen of the electronic device is relatively dark, brightness adjustment can be performed so that the user can hardly perceive the change in the screen brightness, improving the user experience.

[0282] It should be noted that the processor in the above embodiments can also be replaced with any other device with corresponding functions, such as a system on chip (SOC), a microcontroller unit (MCU), etc. The backlight driving module in the above embodiments can also be referred to as a backlight driving circuit (backlight IC). The backlight driving module can also be replaced with any other device with corresponding functions. There is no specific limitation on the replacement structure of the processor and the replacement structure of the backlight driving module.

[0283] The above embodiments illustrate whether to trigger the adjustment of the brightness of the backlight source. The adjustment principle of the backlight source will be described below in combination with a specific circuit.

[0284] In some embodiments, the LED strings in the backlight source 503 adopt a common anode design, that is, the anodes of multiple LED strings are all connected to the same output terminal of the voltage adjustment unit 502a, and the cathodes of each LED string are respectively connected to different current sources (as Figure 5 shown). The common anode design can also be understood as the anodes of each lamp string being short-circuited.

[0285] In this way, the power supply for all the lamp strings of the backlight source is realized through one power supply.

[0286] It can be understood that the output voltage of the battery is usually less than the operating voltage of the LED string. Therefore, the voltage adjustment unit usually has a boost function.

[0287] Exemplarily, the output voltage of the battery is usually between 3.6V and 4.5V. The operating voltage of one LED lamp is usually between 2.72V and 2.9V, and an LED string usually includes 6 or more LED lamps. Therefore, the operating voltage of an LED string is usually greater than 16V, which is greater than the output voltage of the battery.

[0288] Taking the voltage boosting of the output voltage of the battery by the voltage adjustment unit as an example, the structure of the voltage adjustment unit will be described below.

[0289] Exemplarily, Figure 11 FIG. is a schematic structural diagram of a voltage adjustment unit provided by an embodiment of the present application. As Figure 11 shown, the voltage adjustment unit includes: a boost circuit 1101 and a boost control circuit 1102. Among them, the boost circuit 1101 may include: an inductor L1, a switching transistor Qn, a diode D1, a resistor R2, a resistor R3, and a capacitor Co.

[0290] One end of the inductor L1 is connected to the input end of the voltage adjustment unit, and the other end of the inductor L1 is connected to the input end of the diode D1. The output end of the diode D1 is connected to one end of the capacitor C0, and the other end of the capacitor C0 is grounded; the output end of the diode D1 is also connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded; the other end of the inductor L1 is also connected to the first end of the switching transistor Qn, the second end of the switching transistor Qn is grounded, and the control end of the switching transistor Qn is controlled by the boost control circuit 1102.

[0291] In some embodiments, the diode D1 can also be replaced by a switching transistor. No specific limitation is made here.

[0292] Next, the working principle of the boost circuit 1101 will be described.

[0293] When the switching transistor Qn is turned on, the input voltage Vin charges the inductor L1. The capacitor C0 supplies power to the resistor R2, the resistor R3, and the LED lamp string. The voltage difference between the two ends of the resistor R2 and the resistor R3 is the discharge voltage of the capacitor C1.

[0294] When the switching transistor Qn is turned off, the inductor L1 can discharge through the diode D1, the inductor current IL linearly decreases, and the output voltage Vout is maintained by the discharge Ic of the capacitor C0 and the decreasing inductor current IL and slowly decreases. If the switching transistor Qn remains off, Vout will eventually drop to 0V.

[0295] In the boost control circuit 1102, the magnitude of the output voltage of the boost circuit 1101 can be controlled by controlling the duty cycle of the conduction and cutoff of the switching transistor Qn. The boost control circuit 1102 can collect the voltage between the resistor R2 and the resistor R3, and then confirm the output voltage Vout through this voltage to confirm whether the output voltage reaches the preset voltage. In some embodiments, the preset voltage can be determined by the current source unit 502c by detecting the current of the LED lamp string corresponding to each output end.

[0296] In some other embodiments, the voltage adjustment unit 502a may have multiple output terminals, and the multiple output terminals may be connected to different LED lamp strings in the backlight 503.

[0297] In some embodiments, the number of output terminals corresponds one-to-one to the number of LED lamp strings.

[0298] Exemplarily, Figure 12 FIG. is a schematic structural diagram of another voltage adjustment unit provided by an embodiment of the present application. Taking the case of including N output terminals, each output terminal corresponding to an LED lamp string respectively, as Figure 12 shown, the voltage adjustment unit includes: a SIMO circuit 1201 and a boost control circuit 1202. The SIMO circuit 1201 includes: an inductor, an upper switching tube, N lower switching tubes, 2N resistors, and N capacitors. Among them, any one output terminal may correspond to 1 switching tube, 2 resistors, and 1 capacitor. The 1 switching tube, 2 resistors, and 1 capacitor may form a boost circuit with the inductor and the upper switching tube.

[0299] The boost control circuit 1202 may be an integral body, or may include: N sub-control circuits, each sub-control circuit corresponding to one output terminal. The structure of the boost control circuit 1202 is not specifically limited herein. The boost control circuit 1202 may be integrated with the control unit and the control circuit of the voltage adjustment unit, or may exist independently, which is not specifically limited herein.

[0300] Taking 3 output terminals as an example, as Figure 12 shown, the SIMO circuit 1201 includes: an inductor L2, a switching tube Q, a switching tube Q1, a switching tube Q2, a switching tube Q3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor Cout1, a capacitor Cout2, and a capacitor Cout3. Among them, the switching tube Q is the upper switching tube; the switching tubes Q1, Q2, and Q3 are all lower switching tubes.

[0301] Specifically, the inductor L2, the switching tube Q, the switching tube Q1, the resistor R4, the resistor R5, and the capacitor Cout1 may form a boost circuit; the inductor L2, the switching tube Q, the switching tube Q2, the resistor R6, the resistor R7, and the capacitor Cout2 may form a boost circuit; the inductor L2, the switching tube Q, the switching tube Q3, the resistor R8, the resistor R9, and the capacitor Cout3 may form a boost circuit.

[0302] It should be noted that by controlling the duty cycle of the conduction and cut-off of the upper switching tube Q and the conduction and cut-off of each lower switching tube, the output voltage of each output terminal can be controlled.

[0303] In some embodiments, within one conduction and cutoff cycle of the upper switching transistor Q, each lower switching transistor is controlled to conduct. At the same moment, one lower switching transistor conducts, and the remaining lower switching transistors are all cutoff.

[0304] Exemplarily, Figure 13 A timing diagram provided by an embodiment of the present application is shown. As Figure 13 shown, taking the period from time t0 to time t4 as one conduction and cutoff cycle of the switching transistor Q as an example.

[0305] At time t0, the switching transistor Q conducts; from time t0 to time t1, the switching transistor Q continuously conducts, and the switching transistors Q1, Q2, and Q3 all remain cutoff. The induced current IL of the inductor L2 increases.

[0306] At time t1, the switching transistor Q cutoff, the switching transistor Q1 conducts, and the switching transistors Q2 and Q3 all remain cutoff. From time t1 to time t2, the switching transistor Q1 continuously conducts, and the switching transistors Q, Q2, and Q3 all remain cutoff. The induced current IL of the inductor L2 starts to decrease.

[0307] At time t2, the switching transistor Q cutoff, the switching transistor Q2 conducts, and the switching transistors Q1 and Q3 all remain cutoff. From time t2 to time t3, the switching transistor Q2 continuously conducts, and the switching transistors Q, Q1, and Q3 all remain cutoff. The induced current IL of the inductor L2 continues to decrease.

[0308] At time t3, the switching transistor Q cutoff, the switching transistor Q3 conducts, and the switching transistors Q1 and Q2 all remain cutoff. From time t3 to time t4, the switching transistor Q3 continuously conducts, and the switching transistors Q, Q1, and Q2 all remain cutoff. The induced current IL of the inductor L2 continues to decrease.

[0309] In this way, by controlling the conduction time of each lower switching transistor, the output voltage of its corresponding output terminal can be controlled.

[0310] In other embodiments, within one conduction and cutoff cycle of the upper switching transistor Q, only one lower switching transistor conducts, and the remaining lower switching transistors all remain cutoff. The output voltage of each output terminal is controlled through multiple cycles.

[0311] Exemplarily, Figure 14 A timing diagram provided by an embodiment of the present application is shown. As Figure 14 shown, at time t0, the switching transistor Q is cutoff and the switching transistor Q1 conducts; from time t0 to time t1, the switching transistor Q1 continuously conducts, and the switching transistors Q, Q2, and Q3 all remain cutoff. The induced current IL of the inductor L2 starts to decrease.

[0312] At time t1, the switching transistor Q is turned on, and the switching transistors Q1, Q2, and Q3 are all turned off. From time t1 to time t2, the switching transistor Q remains turned on, and the switching transistors Q1, Q2, and Q3 are all turned off. The induced current IL of the inductor L2 starts to increase.

[0313] At time t2, the switching transistor Q is turned off, and the switching transistor Q2 is turned on, while the switching transistors Q1 and Q3 are both turned off. From time t2 to time t3, the switching transistor Q2 remains turned on, and the switching transistors Q, Q1, and Q3 are all turned off. The induced current IL of the inductor L2 starts to decrease.

[0314] At time t3, the switching transistor Q is turned on, and the switching transistors Q3, Q1, and Q2 are all turned off. From time t3 to time t4, the switching transistor Q remains turned on, and the switching transistors Q1, Q2, and Q3 are all turned off. The induced current IL of the inductor L2 starts to increase.

[0315] At time t4, the switching transistor Q is turned off, and the switching transistor Q3 is turned on, while the switching transistors Q1 and Q2 are both turned off. From time t4 to time t5, the switching transistor Q3 remains turned on, and the switching transistors Q, Q1, and Q2 are all turned off. The induced current IL of the inductor L2 starts to decrease.

[0316] At time t5, the switching transistor Q is turned on, and the switching transistors Q3, Q1, and Q2 are all turned off. The induced current IL of the inductor L2 starts to increase.

[0317] In this way, by controlling the conduction time of each lower switching transistor, the output voltage of its corresponding output terminal can be controlled. In addition, in different cycles, the interference between the switching transistors can be reduced, and the cross current can be reduced.

[0318] It should be noted that since the required output voltages of each LED lamp string are different, the duty cycles of the lower switching transistors corresponding to the output terminals of each LED lamp string are different.

[0319] In the embodiment of the present application, the boost control circuit 1202 can adjust the output voltages of each output terminal one by one (which can also be understood as adjusting the duty cycle of the lower switching transistor) to reduce the calculation amount; or it can also adjust the output voltages of each output terminal simultaneously (which can also be understood as adjusting the duty cycle of the lower switching transistor), and no specific limitation is made here.

[0320] The boost control circuit 1102 can collect the voltage between two resistors corresponding to each output terminal, and then confirm the output voltage Vout of its corresponding output terminal through this voltage, and further confirm whether its corresponding output voltage reaches the preset voltage corresponding to this output terminal. In some embodiments, the preset voltage can be determined by the current source unit by detecting the current of the LED lamp string at its corresponding output terminal.

[0321] It can be understood that due to reasons such as manufacturing processes, the voltage drops of different LED lights are different, and thus the conduction voltage drops of different lamp strings are different. Therefore, if the LED lamp strings in the backlight source are connected using a common anode design scheme, the output voltage of the voltage adjustment unit needs to be greater than the maximum voltage drop voltage among all the LED lamp strings in the backlight source. In addition, the current source also has a certain voltage drop. Therefore, the output voltage of the voltage adjustment unit is usually greater than the sum of the maximum voltage drop voltage among all the LED lamp strings and the fixed voltage value Voffset.

[0322] If the LED lamp strings in the backlight source respectively correspond to different output terminals, the output voltages of the output terminals of the voltage adjustment unit can be the same or different. The output voltages of the output terminals of the voltage adjustment unit do not need to be determined based on the maximum voltage drop voltage among all the LED lamp strings. The output voltages of the voltage adjustment unit do not all need to be greater than the sum of the maximum voltage drop voltage among all the LED lamp strings and the fixed voltage value.

[0323] Exemplarily, Figure 15 is a schematic diagram of the voltages required for each LED lamp string provided by an embodiment of the present application. As Figure 15 shown, taking the backlight source including LED lamp string 1, LED lamp string 2, LED lamp string 3, LED lamp string 4, LED lamp string 5, and LED lamp string as an example, the conduction voltage drops required for each LED lamp string are different.

[0324] If the 6 LED lamp strings are connected using a common anode design scheme, the output voltage of the voltage adjustment unit needs to be greater than the sum of the maximum voltage drop voltage among the 6 LED lamp strings and the fixed voltage value. For example, the output voltage of the voltage adjustment unit can be Vout4.

[0325] If the 6 LED lamp strings respectively correspond to different output terminals, the output voltages of the 6 output terminals of the voltage adjustment unit are different. The output voltages of the 6 output terminals do not all need to be greater than the sum of the maximum voltage drop voltage among the 6 LED lamp strings and the fixed voltage value.

[0326] Exemplarily, the output voltages of the output terminals corresponding to LED lamp string 1, LED lamp string 2, LED lamp string 3, LED lamp string 4, LED lamp string 5, and LED lamp string can be Vout1, Vout2, Vout3, Vout4, Vout5, and Vout6 respectively. Among them, Vout1, Vout2, Vout3, Vout5, and Vout6 are all less than Vout4.

[0327] In this way, each LED lamp string can be powered separately, thereby reducing the power consumption loss caused by the excessively high output voltage of the voltage adjustment unit.

[0328] Exemplarily, taking a single LED string including 12 LED lamps as an example, the voltage drop VF of a single LED lamp is usually between 2.7V and 2.9V. Then, the voltage drop VFsum of the LED string is VF * 12, that is, between 32.4V and 34.8V. If there is an LED string with the maximum voltage drop of the lamp string VFSUM_MAX, that is, 34.8V; the voltage drops of the remaining lamp strings are the minimum voltage drop of the lamp string VFSUM_MIN, that is, 32.4V. If the voltage of the current source Vheadroom is 0.5V, the current ILED of a single LED string is 25mA.

[0329] In the common anode scheme, the output voltage VoutMAX of the voltage adjustment unit in the backlight driving module is the sum of VFSUM_MAX and Vheadroom, that is, 35.3V. The total current ILED_SUM of 8 LED strings is 200mA, and the total power consumption Pt is VoutMAX * ILED_SUM, that is, 7060mW.

[0330] In the scheme of different output terminals, the total power consumption Pt is (VFSUM_MAX + Voffset1) * ILED + (VFSUM_MIN + Voffset1) * ILED * 7. It can be understood that according to the I-V characteristic curve of the backlight LED (light emitting diode), Voffset1 is very small and not in the same order of magnitude as VFSUM_MAX, so it can be ignored. Therefore, the total power consumption Pt is 6480mW. The energy consumption is relatively small.

[0331] In some embodiments, after confirming the brightness adjustment, the backlight driving module can adjust the current of the LED string through the current source.

[0332] In other embodiments, after confirming the brightness adjustment, the backlight driving module can also first adjust the output voltage of each output terminal, and then adjust the current of the LED string through the current source.

[0333] In the embodiments of the present application, since Figure 12 In the circuit shown, the output voltages of each output terminal are independent. Therefore, the current of each LED string can be roughly adjusted by adjusting the output voltage VBOOSTx of each output terminal until the actual lamp string current reaches the required lamp string current. After completing the adjustment of the VBOOSTx voltage, the current source connected to the cathode of the LEDx string can further finely adjust the lamp string current. In this way, the output voltage VBOOSTx of each output terminal can be further compressed.

[0334] Exemplarily, Figure 16 is a schematic flow chart of a method for adjusting the brightness of a backlight source provided by an embodiment of the present application. As Figure 16 shown, the method includes:

[0335] S1601. After receiving the brightness modification instruction, the backlight driving module confirms the adjusted current of the LED string according to the adjusted screen brightness in the brightness modification instruction.

[0336] S1602. After confirming the brightness adjustment, adjust the output voltage VBOOSTx of each output terminal according to the adjusted current of the LED string and the preset value B.

[0337] The confirmation process of the brightness adjustment can refer to the Figure 10A or Figure 10B method flow shown above, which will not be elaborated here in detail.

[0338] In some embodiments, for any LED string, the current source unit can confirm the preset voltage corresponding to the LED string according to the adjusted current of the LED string; the voltage adjustment unit adjusts the voltage of the output terminal corresponding to the LED string according to the preset voltage. The current source unit can update the preset voltage corresponding to the LED string according to the actual current of the LED string, and the adjustment unit adjusts according to the updated preset voltage until the absolute value of the difference between the actual current of the LED string and the adjusted current of the LED string is less than the preset value B.

[0339] S1603. When the absolute value of the difference between the actual current of the LED string and the adjusted current of the LED string is less than the preset value B, raise the output voltage of each output terminal by a fixed voltage value Voffset. The fixed voltage value Voffset is determined according to the voltage drop of the current source.

[0340] In some embodiments, for any LED string, the current source unit can confirm the preset voltage corresponding to the LED string according to the fixed voltage value Voffset; the voltage adjustment unit adjusts the voltage of the output terminal corresponding to the LED string according to the preset voltage.

[0341] It should be understood that the current source unit can update the preset voltage corresponding to each output terminal in the voltage adjustment unit according to the fixed voltage value Voffset; subsequently, the voltage adjustment unit can adjust the output voltage based on the updated preset voltage.

[0342] The current source unit can also transmit the fixed voltage value Voffset or a signal for indicating an increase in the fixed voltage value to the voltage adjustment unit, and the voltage adjustment unit controls the output voltage of each output terminal to increase by a fixed voltage value Voffset according to the fixed voltage value Voffset or the signal.

[0343] S1604. Adjust the current of the LED string through the current source.

[0344] When the absolute value of the difference between the actual string current and the current of the adjusted LED string is less than a preset value C, stop the adjustment.

[0345] The preset value C is less than the preset value B. The embodiments of the present application do not specifically limit the values of the preset value B and the preset value C.

[0346] In this way, first, the current of the LED string is roughly adjusted by adjusting the output voltage, and then fine adjustment is performed by the current source. The change in the current adjustment of the current source can be reduced, and the power consumption of the current source can be reduced.

[0347] It can be understood that if the processor can also confirm whether to issue a brightness modification instruction to the backlight driving module by confirming whether the preset conditions (preset condition A, preset condition B, preset condition C) are met. Then before the processor sends the brightness modification instruction, the processor has determined whether to perform brightness adjustment; the backlight driving module does not need to confirm whether to perform brightness adjustment before executing S1602.

[0348] The embodiments of the present application provide a backlight driving module. The backlight driving module can include one or more processors, and one or more processors are used to call computer instructions to enable the electronic device to execute the technical solutions in the above embodiments. Its implementation principle and technical effects are similar to those of the above related embodiments, and will not be described in detail here.

[0349] The embodiments of the present application provide an LCD display screen. The display screen includes: a liquid crystal panel, a backlight, and the backlight driving module described in any one of the above possible implementation manners. The liquid crystal panel is used to adjust the transmittance of the light emitted by the backlight; the backlight is used to emit light; the backlight driving module is used to adjust the intensity of the light emitted by the backlight.

[0350] The embodiments of the present application provide an electronic device, and the electronic device includes: the above various possible LCD display screens.

[0351] It should be noted that the module names involved in the embodiments of the present application can all be defined as other names, as long as the functions of each module can be realized, and the names of the modules are not specifically limited.

[0352] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the embodiments of the present application are all information and data that have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or refuse.

[0353] The method provided by the embodiments of the present application has been described above. Next, the device for executing the above method provided by the embodiments of the present application will be described. Those skilled in the art can understand that the method and the device can be combined and cited with each other. The related device provided by the embodiments of the present application can execute the steps in the above method.

[0354] The method provided by the embodiments of the present application can be applied to an electronic device with a display function. The electronic device includes a terminal device. For the specific device form of the terminal device and the like, reference can be made to the above related description, which will not be elaborated here.

[0355] The embodiments of the present application provide an electronic device, which includes: one or more processors and a memory; the memory is coupled to the one or more processors, and the memory is used to store computer program code. The computer program code includes computer instructions, and the one or more processors call the computer instructions to enable the electronic device to execute the above method.

[0356] The embodiments of the present application provide a chip or a chip system. The chip or the chip system includes one or more processors, and the one or more processors are used to call computer instructions to enable the electronic device to execute the technical solutions in the above embodiments. The implementation principle and technical effects are similar to those of the above related embodiments, which will not be elaborated here.

[0357] The embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium includes computer instructions. When the computer instructions run on the electronic device, the electronic device is enabled to execute the above method. The methods described in the above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the functions can be stored as one or more instructions or codes on a computer-readable medium or transmitted on a computer-readable medium. The computer-readable medium can include a computer storage medium and a communication medium, and can also include any medium that can transfer a computer program from one place to another. The storage medium can be any target medium accessible by a computer.

[0358] In one possible implementation, the computer-readable medium may include RAM, ROM, compact disc read-only memory (CD-ROM), or other optical disc storage, magnetic disk storage, or any other medium that is intended to carry or store the desired program code in the form of instructions or data structures and that can be accessed by a computer. Moreover, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of the medium. As used herein, disk and disc include optical disc, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0359] An embodiment of the present application provides a computer program product, which includes computer program code that, when run, causes a computer to execute the above method.

[0360] Embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processing unit of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable devices to generate a machine, such that the instructions executed by the processing unit of the computer or other programmable data processing device generate means for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0361] The above specific embodiments further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present invention should be included within the protection scope of the present invention.

Claims

1. A brightness adjustment method, characterized in that: Applied to a backlight driving module, the backlight driving module is used to drive a backlight source in an LCD display screen, the method comprising: Receiving a first instruction, wherein the first instruction is used to instruct to adjust the screen brightness of the LCD display screen from a first brightness to a second brightness; When the brightness of the display screen of the LCD screen meets the first preset condition, adjusting the brightness of the backlight source according to the second brightness; When the brightness of the display image of the LCD display screen does not satisfy the first preset condition, the brightness of the backlight source is not adjusted, and it is continued to be determined whether the brightness of the display image of the LCD display screen satisfies the first preset condition; When the first brightness does not satisfy a second preset condition, the brightness of the backlight source is adjusted according to the second brightness.

2. The method according to claim 1, characterized in that The first preset condition includes: the average brightness of the display image of the LCD display screen is less than or equal to a first threshold, or the maximum brightness of the display image of the LCD display screen is less than or equal to a second threshold.

3. The method according to claim 1, characterized in that When the brightness of the display screen on the LCD display screen satisfies a first preset condition, adjusting the brightness of the backlight source according to the second brightness includes: When the first brightness satisfies the second preset condition and the brightness of the display screen satisfies the first preset condition, adjusting the brightness of the backlight source according to the second brightness; When the brightness of the display screen of the LCD display screen does not meet the first preset condition, the brightness of the backlight source is not adjusted, and the brightness of the display screen of the LCD display screen is continuously determined to meet the first preset condition, including: When the first brightness satisfies the second preset condition and the brightness of the display image of the LCD display screen does not meet the first preset condition, the brightness of the backlight source is not adjusted, and it is continued to be determined whether the brightness of the display image of the LCD display screen meets the first preset condition.

4. The method according to claim 1 or 3, characterized in that: The second preset condition includes: the first brightness is less than or equal to a third threshold.

5. The method according to claim 1, characterized in that When the brightness of the display screen on the LCD display screen satisfies a first preset condition, adjusting the brightness of the backlight source according to the second brightness includes: When the first brightness and the second brightness meet a third preset condition, and the brightness of the display screen of the LCD display screen meets the first preset condition, adjusting the brightness of the backlight source according to the second brightness; When the brightness of the display screen of the LCD display screen does not meet the first preset condition, the brightness of the backlight source is not adjusted, and the brightness of the display screen of the LCD display screen is continuously determined to meet the first preset condition, including: When the first brightness and the second brightness satisfy the third preset condition, and the brightness of the display image of the LCD display screen does not satisfy the first preset condition, the brightness of the backlight source is not adjusted, and it is continued to be determined whether the brightness of the display image of the LCD display screen satisfies the first preset condition.

6. The method according to claim 5, characterized in that The method further includes: if the first brightness and the second brightness do not satisfy the third preset condition, adjusting the brightness of the backlight source according to the second brightness.

7. The method according to claim 5 or 6, characterized in that: The third preset condition includes: an absolute value of a difference between the first brightness and the second brightness is less than or equal to a fourth threshold.

8. The method according to claim 1, characterized in that When the brightness of the display screen on the LCD display screen satisfies a first preset condition, adjusting the brightness of the backlight source according to the second brightness includes: When the first brightness satisfies a second preset condition, the first brightness and the second brightness satisfy a third preset condition, and the brightness of the display screen satisfies the first preset condition, adjusting the brightness of the backlight source according to the second brightness; When the brightness of the display screen of the LCD display screen does not meet the first preset condition, the brightness of the backlight source is not adjusted, and the brightness of the display screen of the LCD display screen is continuously determined to meet the first preset condition, including: When the first brightness satisfies the second preset condition, the first brightness and the second brightness satisfy the third preset condition, and the brightness of the display image of the LCD display screen does not satisfy the first preset condition, the brightness of the backlight source is not adjusted, and it is continued to be determined whether the brightness of the display image of the LCD display screen satisfies the first preset condition.

9. The method according to claim 8, characterized in that The method further includes: if the first brightness does not satisfy the second preset condition, or the first brightness and the second brightness do not satisfy the third preset condition, adjusting the brightness of the backlight source according to the second brightness.

10. The method according to any one of claims 1-3, 5, 8 or 9, characterized in that: The backlight driving module comprises: a current source unit, the current source unit comprises at least one current source, and the at least one current source corresponds one-to-one to the LED light string in the backlight source; The adjusting the brightness of the backlight source according to the second brightness includes: Adjust the input voltage of each LED light string in the backlight source according to a first current value and a first preset value; the first current value is the current value corresponding to the LED light string at the second brightness; When the current values ​​of the LED light strings all meet the fourth preset condition, the current values ​​of the LED light strings are adjusted by the current sources corresponding to the LED light strings until the current values ​​of the LED light strings all meet the fifth preset condition; The fourth preset condition includes: the absolute value of the difference between the first current value and the current value of the LED light string is less than or equal to the first preset value; the fifth preset condition includes: the absolute value of the difference between the first current value and the current value of the LED light string is less than or equal to the second preset value, and the second preset value is less than the first preset value.

11. A backlight driving module, characterized in that: The backlight driving module is used to execute the method according to any one of claims 1-10.

12. The backlight driving module according to claim 11, characterized in that: The backlight driving module comprises: a first port and a second port; The first port is used to receive a first instruction from the first chip; the first instruction is used to instruct to adjust the screen brightness of the LCD display screen from the first brightness to the second brightness; The second port is used to receive brightness information of a display image of the LCD display screen, and the brightness information of the display image of the LCD display screen comes from the first chip or a timing controller in the LCD display screen.

13. The backlight driving module according to claim 12, characterized in that: The second port is specifically used to receive a first signal; wherein, when the first signal is at a first level, the first signal is used to indicate that the brightness of the display screen of the LCD display screen meets a first preset condition; when the first signal is at a second level, the first signal is used to indicate that the brightness of the display screen of the LCD display screen does not meet the first preset condition; The backlight driving module is specifically configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the first signal is at the first level.

14. The backlight driving module according to claim 13, characterized in that: The backlight driving module further includes: a current amplifying circuit and a first comparator; The current amplifying circuit is used to collect the current of the LED light string and convert it into a voltage signal; The first comparator is used to compare the voltage signal with a first reference signal and output a second signal; wherein the first reference signal is determined according to a second preset condition; when the second signal is at a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is at a fourth level, the second signal is used to indicate that the first brightness does not meet the second preset condition; The backlight driving module is specifically configured to adjust the brightness of the backlight source according to the second brightness when the first signal is at the first level and the second signal is at the third level; The backlight driving module is further configured to adjust the brightness of the backlight source according to the second brightness when the second signal is at the fourth level.

15. The backlight driving module according to claim 13, characterized in that: The backlight driving module further includes: a register unit and a second comparator; The register unit is used to store the first brightness; The second comparator is used to compare the voltage signal corresponding to the first brightness with a second reference signal, and output a second signal; wherein the second reference signal is determined according to a second preset condition; when the second signal is at a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is at a fourth level, the second signal is used to indicate that the first brightness does not meet the second preset condition; The backlight driving module is specifically configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the first signal is at the first level and the second signal is at the third level; The backlight driving module is further configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the second signal is at the fourth level.

16. The backlight driving module according to claim 13, characterized in that: The backlight driving module further includes: a register unit and an operation circuit; The register unit is used to store the first brightness and the second brightness; The operation circuit is used to obtain a third signal according to the first brightness and the second brightness; wherein, when the third signal is at a fifth level, the third signal is used to indicate that the first brightness and the second brightness meet a third preset condition; when the third signal is at a sixth level, the third signal is used to indicate that the first brightness and the second brightness do not meet the third preset condition; The backlight driving module is specifically configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the first signal is at the first level and the third signal is at the fifth level; The backlight driving module is further configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the third signal is at the sixth level.

17. The backlight driving module according to claim 13, characterized in that: The backlight driving module further includes: a register unit, an operation circuit and a second comparator; The register unit is used to store the first brightness and the second brightness; The second comparator is used to compare the voltage signal corresponding to the first brightness with a second reference signal, and output a second signal; wherein the second reference signal is determined according to a second preset condition; when the second signal is at a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is at a fourth level, the second signal is used to indicate that the first brightness does not meet the second preset condition; The operation circuit is used to obtain a third signal according to the first brightness and the second brightness; wherein, when the third signal is at a fifth level, the third signal is used to indicate that the first brightness and the second brightness meet a third preset condition; when the third signal is at a sixth level, the third signal is used to indicate that the first brightness and the second brightness do not meet the third preset condition; The backlight driving module is specifically configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the first signal is at the first level, the second signal is at the third level, and the third signal is at the fifth level; The backlight driving module is further configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the second signal is at the fourth level or the third signal is at the sixth level.

18. The backlight driving module according to claim 17, characterized in that: The backlight driving module further includes: an AND gate circuit; The AND gate circuit is used to obtain a fifth signal according to the second signal and the third signal; wherein, when the second signal is at the third level and the third signal is at the fifth level, the fifth signal is at the eighth level; and when the second signal is at the fourth level or the third signal is at the sixth level, the fifth signal is at the seventh level; The backlight driving module is specifically configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the first signal is at the first level and the fifth signal is at the eighth level; The backlight driving module is specifically configured to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the fifth signal is at the seventh level.

19. An LCD display screen, characterized in that: The display screen comprises: a liquid crystal panel, a backlight source, and a backlight driving module according to any one of claims 11 to 18; The liquid crystal panel is used to adjust the transmittance of the light emitted by the backlight source; The backlight source is used to emit light; The backlight driving module is used to adjust the intensity of the light emitted by the backlight source.

20. An electronic device, characterized in that: Includes the LCD display screen as described in claim 19.

21. A computer-readable storage medium, characterized in that: The computer-readable storage medium comprises computer instructions, and when the computer instructions are executed on a backlight driving module, the backlight driving module is caused to perform the method according to any one of claims 1 to 10.

22. A computer program product, characterized in that The computer program product comprises a computer program code, and when the computer program code runs on a backlight driving module, the backlight driving module is enabled to perform the method according to any one of claims 1 to 10.

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