Brightness adjustment method, backlight driving module, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a brightness adjusting method, a backlight driving module, electronic equipment and a storage medium, and relates to the technical field of terminals. The method comprises the following steps: receiving a first instruction, wherein the first instruction is used for indicating to adjust the screen brightness of the LCD display screen from first brightness to second brightness; and under the condition that the brightness of the display picture meets the first preset condition, adjusting the brightness of the backlight source of the LCD display screen according to the second brightness. Therefore, whether the brightness of the backlight source is adjusted can be determined according to the brightness of the display picture. Under the condition that a display picture of the electronic equipment is bright, brightness adjustment is not carried out; under the condition that the display picture of the electronic equipment is dark, the brightness can be adjusted.

Description

Technical Field

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

[0002] When using electronic devices such as mobile phones and tablets, the brightness of the display screen may be adjusted. For example, when the ambient light changes, in order to view the screen display more clearly and comfortably, the user can manually adjust the screen brightness, or the electronic device can automatically adjust the screen brightness.

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

[0004] The embodiments of the present application provide a brightness adjustment method, a backlight driving module, an electronic device and a storage medium, which are applied in the field of terminal technology and help reduce the situation of screen brightness jump.

[0005] In a first aspect, an embodiment of the present application provides a brightness adjustment method. The method can be applied to a backlight driver module, a device (e.g., a display screen) including a backlight driver module, and a device including a backlight driver module. The backlight driver module is used to drive a backlight source in an LCD display screen.

[0006] The method includes: receiving a first instruction, 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 display screen meets a first preset condition, adjusting the brightness of the backlight source of the LCD display screen according to the second brightness.

[0007] The first preset condition may correspond to preset condition A described below. The first brightness may correspond to the screen brightness before adjustment described below; 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 may be less than the second brightness, which is not specifically limited here. The first instruction may be generated in response to the first operation or the change in ambient light brightness. The display screen may also be referred to as a display interface, an interface, etc., which is not specifically limited here.

[0008] In this way, it is possible to determine whether to adjust the brightness of the backlight source according to the brightness of the display screen. When the display screen of the electronic device is bright, the brightness adjustment is not performed; when the display screen of the electronic device is dark, the brightness adjustment can be performed to reduce the brightness jump and improve the user experience.

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

[0010] It can also be understood that 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 of the LCD display screen is not adjusted until the brightness of the display screen of the LCD display screen meets the first preset condition. In this way, the brightness of the backlight source is adjusted after the brightness of the display screen is darker, thereby reducing the brightness jump and improving the user experience.

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

[0012] The first threshold may correspond to the brightness threshold A mentioned below; the second threshold may correspond to the brightness threshold B mentioned below, which is not specifically limited here.

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

[0014] In one possible implementation, when the brightness of a display image of an LCD display screen satisfies a first preset condition, the brightness of the backlight source is adjusted according to a second brightness, including: when the first brightness satisfies the second preset condition and the brightness of the display image satisfies the first preset condition, adjusting the brightness of the backlight source according to the second brightness.

[0015] The second preset condition may correspond to the preset condition B described below.

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

[0017] In some embodiments, when 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 judged whether the brightness of the display image of the LCD display screen meets the first preset condition, including: when the first brightness meets 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 judged whether the brightness of the display image of the LCD display screen meets the first preset condition.

[0018] 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 source of the LCD display screen is adjusted until the brightness of the display screen meets the first preset condition. In this way, the brightness of the backlight source is adjusted after the brightness of the display screen is darker, which reduces the brightness jump and improves the user experience.

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

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

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

[0022] In one possible implementation, when the brightness of the display image of the LCD display screen satisfies a first preset condition, the brightness of the backlight source is adjusted according to the second brightness, including: when the first brightness and the second brightness satisfy a third preset condition, and the brightness of the display image of the LCD display screen satisfies the first preset condition, the brightness of the backlight source is adjusted according to the second brightness.

[0023] The third preset condition may correspond to the preset condition C below.

[0024] In this way, when the brightness adjustment range is large, there is no need to wait for the display image to darken, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness; when the brightness adjustment range is small, wait for the display image to darken before adjusting the brightness, which reduces brightness jumps and improves user experience.

[0025] In some embodiments, when 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 the brightness of the display image of the LCD display screen continues to be judged whether it 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 image 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 image of the LCD display screen continues to be judged whether it meets the first preset condition.

[0026] In this way, when the brightness of the display screen meets the third preset condition and does not meet the first preset condition, the brightness of the backlight source of the LCD display screen is adjusted until the brightness of the display screen meets the first preset condition. The brightness of the backlight source is adjusted after the brightness of the display screen is darker, thereby reducing the brightness jump and improving the user experience.

[0027] In a possible implementation, the method further includes: if the brightness of the displayed image does not meet the third preset condition, adjusting the brightness of the backlight source of the LCD display screen. In this way, when the brightness adjustment range is large, there is no need to wait until the displayed image is dark, and the brightness adjustment time can be shortened, thereby meeting the user's need to quickly adjust the screen brightness.

[0028] In a possible implementation, 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 value. The fourth threshold value may correspond to a preset value A mentioned below.

[0029] In one possible implementation, when the brightness of a displayed image satisfies a first preset condition, the brightness of a backlight source of an LCD display screen is adjusted according to a second brightness, including: when the brightness of a displayed image satisfies a first preset condition, the first brightness satisfies a second preset condition, and the first brightness and the second brightness satisfy a third preset condition, the brightness of the backlight source is adjusted according to the second brightness.

[0030] In this way, when the screen brightness is dim, the screen brightness is adjusted in a small range, or the displayed image is dark, the brightness of the backlight source is adjusted to reduce brightness jumps and improve the user experience.

[0031] In some embodiments, when 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 judged whether the brightness of the display image 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 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 judged whether the brightness of the display image of the LCD display screen meets the first preset condition.

[0032] In this way, when the screen brightness is dim and the screen brightness is adjusted in a small range, wait until the display image is darker before adjusting the brightness, reducing brightness jumps and improving user experience.

[0033] 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, adjusting the brightness of the backlight source according to the second brightness.

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

[0035] In one 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 light string in the backlight source; adjusting the brightness of the backlight source according to the second brightness, including: adjusting the input voltage of each LED light string in the backlight source according to the first current value and the first preset value; the first current value is the current value corresponding to the LED light string at the second brightness; when the current value of each LED light string meets the fourth preset condition, adjusting the current value of each LED light string through the current source corresponding to each LED light string until the current value of each LED light string meets 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.

[0036] The first preset value may correspond to the preset value B mentioned below, and the second preset value may correspond to the preset value C mentioned below. The current value of the LED light string may correspond to the actual light string current mentioned below, and the first current value may correspond to the adjusted current of the LED light string mentioned below.

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

[0039] In one 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 from a first brightness to a second brightness; the second port is used to receive brightness information of a display screen, and the brightness information of the display screen comes from the first chip or a timing controller in the LCD display screen.

[0040] The first port and the second port may correspond to the following Figure 6 The first chip may correspond to the processor described below or a chip that can achieve the same function, which is not specifically limited here.

[0041] In one possible implementation, 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 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; and the backlight driving module is specifically used to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the first signal is at a first level.

[0042] In a possible implementation, the backlight driving module also 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 the 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 a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is 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 used to adjust the brightness of the backlight source according to the second brightness when the first signal is a first level and the second signal is a third level; the backlight driving module is also used to adjust the brightness of the backlight source according to the second brightness when the second signal is a fourth level.

[0043] The backlight driver module can correspond to Fig. 7A In the backlight driving module shown, the second signal may correspond to the signal used to indicate the determination result described below.

[0044] In a possible implementation, the backlight driving module also 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 the second reference signal and output the second signal; wherein the second reference signal is determined according to the second preset condition; when the second signal is a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is 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 used to adjust the brightness of the backlight source of the LCD display according to the second brightness when the first signal is the first level and the second signal is the third level; the backlight driving module is also used to adjust the brightness of the backlight source of the LCD display according to the second brightness when the second signal is the fourth level.

[0045] The backlight driver module can correspond to Figure 7B The backlight driver module shown.

[0046] In a possible implementation, the backlight driving module also 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 used to adjust the brightness of the backlight source 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 also used to adjust the brightness of the backlight source of the LCD display screen according to the second brightness when the third signal is at a sixth level.

[0047] The backlight driver module can correspond to Figure 8 The backlight driver module shown.

[0048] In a possible implementation, the backlight driving module also 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 the second reference signal and output the second signal; wherein the second reference signal is determined according to the second preset condition; when the second signal is a third level, the second signal is used to indicate that the first brightness meets the second preset condition; when the second signal is 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 a fifth level, the third signal is used to indicate that the first brightness and the second brightness meet the third preset condition; when the third signal is 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 used 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 also used 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.

[0050] The backlight driver module can correspond to Fig. 9 The backlight driver module shown.

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

[0052] The backlight driving module is specifically used to adjust the brightness of the backlight source of the LCD display 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 used to adjust the brightness of the backlight source of the LCD display according to the second brightness when the fifth signal is at the seventh level.

[0053] The backlight driver module can correspond to Fig. 9 The backlight driver module shown.

[0054] In a third aspect, an embodiment of the present application proposes a brightness adjustment method. The method can be applied to a first chip or a device including the first chip. The method comprises: when the screen brightness of the LCD display screen is a first brightness, in response to a first operation or a change in the ambient light intensity, obtaining a second brightness; when the brightness of the display screen of the LCD display screen satisfies a first preset condition, sending a first instruction to a 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 source in the LCD display screen.

[0055] The first preset condition may correspond to the preset condition A described below. The first brightness may correspond to the screen brightness before adjustment described below; the second brightness may correspond to the screen brightness after adjustment. The first brightness is different from the second brightness. The first brightness may be greater than the second brightness or less than the second brightness, which is not specifically limited here.

[0056] In this way, it is possible to determine whether to adjust the brightness of the backlight source according to the brightness of the display screen. When the display screen of the electronic device is bright, the brightness adjustment is not performed; when the display screen of the electronic device is dark, the 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 image 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 image 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 screen does not meet the first preset condition, the first instruction is not sent until the brightness of the display screen of the LCD display screen meets the first preset condition. In this way, the brightness of the backlight source is adjusted after the brightness of the display screen is darker, thereby reducing the brightness jump and improving the user experience.

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

[0060] The first threshold may correspond to the brightness threshold A mentioned below; the second threshold may correspond to the brightness threshold B mentioned below, which is not specifically limited here.

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

[0062] In one possible implementation, when the brightness of a display image of an LCD display screen satisfies a first preset condition, a first instruction is sent to a backlight driving module, including: when the first brightness satisfies a second preset condition and the brightness of the display image satisfies the first preset condition, a first instruction is sent to the backlight driving module.

[0063] The second preset condition may correspond to the preset condition B described below.

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

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

[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 source of the LCD display screen is adjusted until the brightness of the display screen meets the first preset condition. In this way, the brightness of the backlight source is adjusted after the brightness of the display screen is darker, which reduces the brightness jump and improves the user experience.

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

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

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

[0070] In one possible implementation, when the brightness of the display image of the LCD display screen satisfies a first preset condition, a first instruction is sent to a backlight driving module, including: when the first brightness and the second brightness satisfy a third preset condition, and the brightness of the display image of the LCD display screen satisfies the first preset condition, a first instruction is sent to the backlight driving module.

[0071] The third preset condition may correspond to the preset condition C below.

[0072] In this way, when the brightness adjustment range is large, there is no need to wait for the display image to darken, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness; when the brightness adjustment range is small, wait for the display image to darken before adjusting the brightness, which reduces brightness jumps and improves user experience.

[0073] In some embodiments, when the brightness of the display screen of the LCD display screen does not meet the first preset condition, the first instruction is not sent to the backlight driving module, and the judgment on whether the brightness of the display screen of the LCD display screen meets the first preset condition is continued, 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 screen does not meet the first preset condition, the first instruction is not sent to the backlight driving module, and the judgment on whether the brightness of the display screen of the LCD display screen meets the first preset condition is continued.

[0074] In this way, when the brightness of the display screen meets the third preset condition and does not meet the first preset condition, the brightness of the backlight source of the LCD display screen is adjusted until the brightness of the display screen meets the first preset condition. The brightness of the backlight source is adjusted after the brightness of the display screen is darker, thereby reducing the 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 until the display screen is dark, and the brightness adjustment time can be shortened to meet the user's need to quickly adjust the screen brightness.

[0076] In a possible implementation, 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 value. The fourth threshold value may correspond to a preset value A mentioned below.

[0077] In one possible implementation, when the brightness of the displayed image satisfies a first preset condition, a first instruction is sent to the backlight driving module, including: when the brightness of the displayed image satisfies the first preset condition, the first brightness satisfies the second preset condition, and the first brightness and the second brightness satisfy a third preset condition, the first instruction is sent to the backlight driving module.

[0078] In this way, when the screen brightness is dim, the screen brightness is adjusted in a small range, or the displayed image is dark, the brightness of the backlight source is adjusted to reduce brightness jumps and improve user experience.

[0079] In some embodiments, when the brightness of the display screen of the LCD display screen does not meet the first preset condition, the first instruction is not sent to the backlight driving module, and the judgment on whether the brightness of the display screen of the LCD display screen meets the first preset condition is continued, 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 first instruction is not sent to the backlight driving module, and the judgment on whether the brightness of the display screen of the LCD display screen meets the first preset condition is continued.

[0080] In this way, when the screen brightness is dim and the screen brightness is adjusted in a small range, wait until the display image is darker before adjusting the brightness, reducing brightness jumps and improving user experience.

[0081] In a possible implementation, the method further includes: sending a first instruction to the backlight driving module 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.

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

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

[0084] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising: an LCD display screen described in the second aspect or any possible implementation manner of the second aspect.

[0085] In a fifth aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory, the memory being used to store code instructions, and the processor being used to run the code instructions to execute the method described in the first aspect or any possible implementation of the first aspect, or to execute the method described in the third aspect or any possible implementation of the third aspect.

[0086] In a 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 is run on a computer, the computer executes the method described in the first aspect or any possible implementation of the first aspect, or executes the method described in the third aspect or any possible implementation of the third aspect.

[0087] In the 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, it enables the computer to execute the method described in the first aspect or any possible implementation of the first aspect, or execute the method described in the third aspect or any possible implementation of the third aspect.

[0088] In an eighth aspect, the present application provides a chip or a chip system, the chip or chip system comprising at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and 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 of the first aspect, or to execute the method described in the third aspect or any possible implementation of the third aspect. The communication interface in the chip can be an input / output interface, a pin or a circuit, etc.

[0089] In a possible implementation, the chip or chip system described above in the present application further includes at least one memory, in which instructions are stored. The memory may 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 to eighth aspects of the present application correspond to the technical solutions of the first aspect of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

[0098] Figure 7B A schematic diagram of the structure of another backlight driving module provided in an embodiment of the present application;

[0099] Figure 8 A schematic diagram of the structure of another backlight driving module provided in an embodiment of the present application;

[0100] Fig. 9 A schematic diagram of the structure of another backlight driving module provided in an embodiment of the present application;

[0101] Fig. 10A A schematic diagram of a process of brightness adjustment method provided in an embodiment of the present application;

[0102] Fig. 10B A schematic diagram of a flow chart of another brightness adjustment method provided in an embodiment of the present application;

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

[0104] Fig.12 A schematic diagram of the structure of another voltage adjustment unit provided in an embodiment of the present application;

[0105] Fig.13 A timing diagram provided for an embodiment of the present application;

[0106] Fig.14 Another timing diagram provided for an embodiment of the present application;

[0107] Fig.15 A schematic diagram of the voltage required for each LED light string provided in an embodiment of the present application;

[0108] Fig.16 A schematic flow chart of a backlight source brightness adjustment method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0109] In order to clearly describe the technical solutions of the embodiments of the present application, some terms and technologies involved in the embodiments of the present application are briefly introduced below:

[0110] 1. Liquid crystal display (LCD)

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

[0112] In some embodiments, the LCD screen is provided with a backlight source below the liquid crystal display layer (liquid crystal panel) and a color filter above the liquid crystal display layer. The backlight source emits a white light source to illuminate the liquid crystal display layer. The liquid crystal display layer flips the angle of the liquid crystal particles through a thin film transistor (TFT) circuit to control the propagation direction of the light, cooperates with the polarizers provided on both sides of the liquid crystal display layer to control the amount of light transmitted into the color filter, and forms a color image in combination with the RGB colors printed on the color filter film.

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

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

[0115] 2. Other terms

[0116] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same functions and effects. For example, the first chip and the second chip are only used to distinguish different chips, and their order is not limited. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them 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 indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

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

[0119] 3. Electronic equipment

[0120] The electronic device of the embodiment 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 phones, tablet computers, PDAs, laptop computers, mobile internet devices (MIDs), wearable devices (e.g., smart watches, smart glasses, smart bracelets or smart jewelry, etc.), virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, internet of things (IoT), and the like. The present invention relates to terminal devices in an Internet of Things (IoT) system, terminal devices in a 5G network, or terminal devices in a future evolved public land mobile network (PLMN), etc., and the embodiments of the present application are not limited to this.

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

[0122] In an embodiment of the present application, the 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 called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

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

[0125] For example, Figure 1 A schematic diagram of a screen brightness adjustment interface provided in an embodiment of the present application. Taking a mobile phone as an example, Figure 1 As shown, after the mobile phone receives the operation of the user's finger sliding down from the top of the display screen on the interface 1a, the notification bar interface 1b is displayed.

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

[0127] When the electronic device receives an operation for instructing 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, where the position of the slider on the brightness bar can be expressed as a percentage. The starting position is 0%, and the corresponding screen brightness is a (manually adjusted minimum brightness); the ending position is 100%, and the corresponding screen brightness is b (manually adjusted maximum brightness). Figure 1 As shown, the slider is at a position of 70% on the brightness bar 102.

[0128] It is understandable that the brightness bar can be in a vertical form or any other form in addition to the horizontal form. The embodiment of the present application does not specifically limit the position, form, slider adjustment method, etc. of the brightness bar. Figure 1 The interface shown is only an example, and the interface of the electronic device may also include more or fewer elements, which are not specifically limited here.

[0129] It should be understood that in addition to the above automatic adjustment of screen brightness according to ambient brightness, Figure 1 In addition to adjusting the screen brightness by the brightness bar, the electronic device can also adjust the screen brightness by any other means, such as voice control, etc., which is not specifically limited here. It is understandable that the above Figure 1 The scenario of adjusting the screen brightness in the notification bar interface is described, and the screen brightness can also be adjusted in other scenarios. For example, the screen brightness can be adjusted by sliding during video playback, and the screen brightness change can be triggered by buttons on the display. No specific restrictions are made here.

[0130] However, in the process of adjusting the screen brightness, the user may perceive a step-by-step change in screen brightness, resulting in a poor user experience. In particular, in the case of low screen brightness, the user is more likely to perceive the change in screen brightness when adjusting the screen brightness.

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

[0132] For example, Figure 2 This is a schematic diagram of a display circuit provided in an embodiment of the present application. Figure 2 As shown, the display circuit includes: a backlight driving module 201 and a backlight source 202. 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 201a is used to connect to a battery; the output end of the voltage adjustment unit 201a is connected to the output end of the backlight source 202; and the output end of the backlight source 202 is connected to the current source unit 201c.

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

[0135] Figure 2 In the embodiment, the voltage adjustment unit 201a is used to adjust the voltage output by the battery to a suitable voltage to realize the power supply of the LED light string (also referred to as the light string for short). The control unit 201b is used to confirm the current of the adjusted LED light string according to the adjusted screen brightness in the brightness modification instruction from the processor.

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

[0137] The current source unit 201c is used to control the current flowing through the backlight source according to the adjusted current of the LED light 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 light string.

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

[0139] It should be noted that the conduction state of the switch tube (for example, whether it is on or not, on-resistance, etc.) can be changed by adjusting the voltage applied to the control terminal of the switch tube, thereby changing the current flowing through the switch tube and changing the current flowing through the current source. It is understandable that when the switch tube operates in the linear region, the resistance between the first end and the second end of the switch tube can change with the voltage change of the control terminal. The linear region can also be called a non-saturated region, a variable resistance region, a variable resistance region, etc. in the switch tube. The specific name of the linear region is not limited in the embodiment of the present application.

[0140] For example, Figure 3 A schematic diagram of the structure of a current source provided in an embodiment of the present application. Figure 3 As shown, the current source 2a includes: a switch tube S1, a switch tube S2, a switch tube S3 and a switch tube S4. One end of the switch tube S1, one end of the switch tube S2, one end of the switch tube S3 and one end of the switch tube S4 are all connected to the LED light string 202a; the other end of the switch tube S1, the other end of the switch tube S2, the other end of the switch tube S3 and the other end of the switch tube S4 are all grounded; the control ends (for example, G poles) of the switch tubes S1 to S4 are all controlled by the control circuit in the current source unit 201c; the control circuit is used to drive each current source in the current source unit 201c to adjust the current.

[0141] In the embodiment of the present application, the current ranges corresponding to the switch tubes S1 to S4 are different, and the current adjustment precision is different. For example, the current range corresponding to the switch tube S1 is 0-10mA, and the adjustment precision can be 0.1mA; the current range corresponding to the switch tube S2 is 0-5mA, and the adjustment precision can be 0.05mA; the current range corresponding to the switch tube S3 is 0-2.5mA, and the adjustment precision can be 0.025mA; the current range corresponding to the switch tube S4 is 0-1.25mA, and the adjustment precision can be 0.0125mA.

[0142] Understandably, 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 switch tubes S1 to S4. By adjusting the conduction state of the switch tubes S1 to S4, the current flowing through the current source can be adjusted, thereby achieving the current adjustment of the LED light string.

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

[0144] For example, Figure 4 Schematic diagram of the current and brightness change of a light string provided in an embodiment of the present application. Figure 3 As shown, the lamp string current Iled changes from 0mA to 2.5mA as an example.

[0145] from Figure 4 It can be seen that when the light string current is 1.25mA, the brightness of the light string changes suddenly.

[0146] based on Figure 3 According to the circuit analysis shown, when the light string current is less than 1.25mA, the switch tube S4 is turned on, and the switch tubes S1, S2 and S3 are all turned off. When the light string current is between 1.25mA and 2.5mA, the switch tube S3 is turned on, and the switch tubes S1, S2 and S4 are all turned off. Therefore, when the light string current is 1.25mA, the current source switches the switch tube that is turned on. Specifically, the current source switches from the switch tube S4 being turned on and the switch tube S3 being turned off to the switch tube S4 being turned off and the switch tube S3 being turned on.

[0147] It should be noted that due to differences in manufacturing processes, materials, etc., different switch tubes have different characteristic parameters (for example, on-resistance, current gain, etc.). Therefore, when switching on the switch tube, the brightness of the LED light string may change suddenly.

[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 electronic device displays a bright picture, the brightness adjustment is not performed; when the electronic device displays a dark picture, the brightness adjustment can be performed.

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

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

[0151] For example, Figure 5 This is a schematic diagram of the structure of a brightness adjustment circuit provided in an embodiment of the present application. Figure 5 As shown, the circuit includes: a processor 501 , a backlight driving module 502 and a backlight source 503 .

[0152] The processor 501 is used 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 used to determine whether to delay the brightness adjustment according to the brightness of the display image and the preset condition A.

[0154] Specifically, when the brightness of the displayed image 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 displayed image does not meet the preset condition A, the brightness adjustment is delayed until the brightness of the displayed image 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, the screen brightness can be used to confirm whether to delay adjusting the screen brightness. When the display screen is dark, the screen brightness is adjusted to reduce the situation where the user perceives the screen brightness jump, thereby improving 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 maximum brightness of the display screen.

[0157] In some embodiments, the brightness of the displayed image can be represented by the grayscale value of the pixel. Exemplarily, the brightness of the displayed image can be represented by the average grayscale value of all pixels in the image. Taking the grayscale value of the pixel as an example to represent the brightness of the image, the brightness threshold A can be 100, 50 or any value; the brightness threshold B can be 168, 150 or any value. No specific limitation is made here.

[0158] In the embodiment 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. 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 mentioned above. For details, please refer to the corresponding descriptions above, and no further details will be given here. The current source unit 201c can also confirm the preset voltage corresponding to the LED light string according to the adjusted current of the LED light string; the voltage adjustment unit adjusts the voltage of the output end corresponding to the LED light string according to the preset voltage.

[0159] For example, Figure 6 FIG. 5 is a schematic diagram of the structure of a backlight driving module 502 provided in an embodiment of the present application. Figure 6 As shown, the backlight driving module 502 includes: a port 3a and a port 3b.

[0160] Port 3a is used to receive a brightness modification instruction from processor 501. The brightness modification instruction may be generated by processor 501 in response to an operation for instructing to adjust screen brightness, or after detecting a change in ambient brightness.

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

[0162] Port 3a may be an I2C port, or any other port that can achieve the same function, which is not specifically limited here.

[0163] 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 1; when the display screen does not meet the preset condition A, the first signal is level 2. Port 3b can be a GPIO port, or any other port that can achieve the same function. No specific limitation is made here. Port 3b can be connected to the current source unit 502c.

[0164] Level 1 and level 2 are different. Taking level 1 being higher than level 2 as an example, level 1 can be a high level and level 2 can be a low level; or, taking level 1 being lower than level 2 as an example, level 1 can be a low level and level 2 can be a high level, which is not specifically limited here. The embodiment of the present application does not specifically limit the values ​​of level 1 and level 2.

[0165] The first signal may come from the processor 501 or from a timing controller (Tcon) of an LCD display screen. The timing controller may also be called a display controller, a display chip, a graphics card, etc., which is not specifically limited here.

[0166] Take the first signal from the processor 501 as an example. The processor 501 can calculate the brightness of the display screen (display screen) in real time. When the brightness of the display screen meets the preset condition A, it is considered that the screen display content is dim at this time, and the first signal is level 2. Otherwise, it is considered that the screen display content is bright at this time, and the first signal is level 1.

[0167] It is understandable that Tcon can receive image data from the processor 501 and convert it into driving signals (eg, synchronization signals, field synchronization signals, clock signals, etc.) required by the liquid crystal layer (also referred to as a 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 adjust the current. 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 adjust the brightness according to the first signal transmitted by the port 3b.

[0169] Combine the following Figure 5 and Figure 6 The brightness adjustment process is described.

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

[0171] The control unit 502b can obtain a driving signal A according to the brightness modification instruction, and the driving signal A includes: the current of the LED light string after adjustment.

[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 adjusting the screen brightness based on the brightness of the displayed image when the screen brightness before adjustment meets the preset condition B; if the screen brightness before adjustment does not meet the preset condition B, the brightness of the displayed image is not judged and the screen brightness can be adjusted.

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

[0175] It is understandable that, generally, when the screen brightness is low, the human eye can easily perceive the change in screen brightness, so the dimming accuracy of the terminal device is required to be high. When the screen brightness is high, the human eye cannot easily perceive the change in screen brightness due to sufficient light.

[0176] It is understandable 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 adjusting the current of the LED light string before adjustment.

[0177] In some embodiments, the backlight driving module can automatically determine whether the preset condition C is satisfied.

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

[0179] For example, Fig. 7A This is a schematic diagram of the structure of a backlight driving module provided in an embodiment of the present application. Fig. 7A As shown, the backlight driving module includes: a current sampling circuit 701 and a comparator 702 .

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

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

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

[0183] When the first signal is at level 1, the brightness is adjusted. When the first signal is at level 2, the brightness is not adjusted until the first signal is at level 1.

[0184] When the analog voltage signal is greater than or equal to the reference voltage Vref, the judgment 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 judgment result is level four, indicating that the screen brightness meets the preset condition B.

[0185] Level 3 and level 4 are different. Taking level 3 being higher than level 4 as an example, level 3 can be a high level and level 4 can be a low level; or, taking level 3 being lower than level 4 as an example, level 3 can be a low level and level 4 can be a high level, which is not specifically limited here. The embodiment of the present application does not specifically limit the values ​​of level 3 and level 4.

[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 possible implementation mode 2, whether the preset condition B is met is determined by the current backlight brightness value.

[0188] For example, Figure 7B This is a schematic diagram of the structure of another backlight driving module provided in an embodiment of the present application. Figure 7B As 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 threshold A mentioned above.

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

[0191] When the determination result is level 3 and the first signal is level 1, the brightness is adjusted. When signal A is level 4, the brightness is adjusted. When the determination result is level 3 and the first signal is level 2, the brightness is not adjusted until the first signal is level 1, and then the brightness is adjusted.

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

[0193] On the basis of the above embodiment, the backlight driving module can also determine whether to adjust the brightness according to the brightness of the display image according to the adjustment range of the screen brightness.

[0194] Specifically, when the screen brightness before and after adjustment meets the preset condition C, whether to delay the brightness adjustment is determined based on the brightness of the displayed image; when the screen brightness before and after adjustment does not meet the preset condition C, the brightness adjustment is not delayed 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 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 500nit as an example, the preset value A can be 50nit, 10nit or any value. Taking the screen brightness as an example of a brightness level, the preset value A can be the brightness level corresponding to 10nit, the brightness level corresponding to 500nit, or any value, which is not specifically limited here. The embodiments of the present application do not limit the specific value of the preset value.

[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 in the same interval. Exemplarily, taking the screen brightness as a percentage of the maximum screen brightness as an example, the screen brightness can be divided into three intervals: 0 to 15%, 15% to 40%, and 40% to 100%. When the screen brightness before and after adjustment is both within the range of 0 to 15%, 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 embodiment of the present application does not specifically limit the preset condition C.

[0197] In this way, when the brightness adjustment range is large, there is no need to wait for the display image to darken, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness; when the brightness adjustment range is small, wait for the display image to darken before adjusting the brightness, which reduces brightness jumps and improves user experience.

[0198] In some embodiments, the backlight driving module can automatically determine whether the preset condition C is satisfied.

[0199] For example, Figure 8 This is a schematic diagram of the structure of a backlight driving module provided in an embodiment of the present application. Figure 8 As shown, the backlight driving module includes: a register unit 801 and an operation 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 backlight brightness value to be executed (which can also be referred to as the adjusted screen brightness value, the adjusted screen brightness, etc.).

[0201] The operation circuit 802 can obtain the signal B according to the voltage corresponding to the current backlight brightness value and the voltage corresponding to the backlight brightness value to be executed.

[0202] For example, Figure 8 As shown, the operation circuit 802 may include: a subtraction circuit 81 , a subtraction circuit 82 , a comparator 83 , a comparator 84 , and an 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 a difference voltage A. The comparator 83 can compare the difference voltage A with the reference voltage Vref3 to obtain a 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 a difference voltage B. The comparator 84 can compare the difference voltage B with the reference voltage Vref3 to obtain a comparison signal 2 .

[0205] The AND gate circuit 85 can obtain the signal B according to 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 comparison signal 1 and comparison signal 2 are high level, a high level signal B is output, indicating that the screen brightness before and after adjustment meets the preset condition C; when comparison signal 1 or comparison signal 2 is 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 low level, a low level signal B is output, indicating that the screen brightness before and after adjustment meets the preset condition C; when comparison signal 1 or comparison signal 2 is high level, a high level signal B is output, indicating that the screen brightness before and after adjustment does not meet the preset condition C.

[0210] The structure of the operation circuit 802 shown in the above embodiment is only an example, and can be replaced by any other structure that can achieve the same function, which is not specifically limited here. The embodiment of the present application does not specifically limit the structure of the operation circuit 802.

[0211] The current source unit may determine whether to perform brightness adjustment according to the 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 level 1, brightness adjustment is performed. When signal B indicates that the screen brightness before and after adjustment does not meet the preset condition C, brightness adjustment is performed. When signal B indicates that the screen brightness before and after adjustment meets the preset condition C and the first signal is level 2, brightness adjustment is not performed until the first signal reaches level 1 and brightness adjustment is performed.

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

[0214] Level 5 and level 6 are different. Taking level 5 being higher than level 6 as an example, level 5 can be a high level and level 6 can be a low level; or, taking level 5 being lower than level 6 as an example, level 5 can be a low level and level 6 can be a high level, which is not specifically limited here. The embodiment of the present application does not specifically limit the values ​​of level 5 and level 6.

[0215] Specifically, the backlight driving module further includes: a port for receiving signal B. 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 level five and the first signal is level one, a signal for indicating adjustment of the screen brightness is output; when signal B is level six, or the first signal is level two, a signal for indicating not adjusting the screen brightness is output.

[0217] In this way, the judgment of the preset condition A and the 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 is understandable that the above embodiment describes the case where two preset conditions (for example, preset condition A and preset condition B, and preset condition A and preset condition C) are used to determine whether to adjust the brightness. It is also possible to determine whether to adjust the brightness based on three preset conditions.

[0220] For example, when preset conditions A, B, and C are met, brightness adjustment can be performed; when preset conditions B or C are not met, brightness adjustment can be performed. When preset conditions B and C are not met, and preset condition A is not met, no adjustment is performed until the display screen meets preset condition A, and then brightness adjustment is performed.

[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 image to darken, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness. When the brightness adjustment range is small, wait for the display image to darken before adjusting the brightness, which reduces brightness jumps and improves user experience.

[0222] For example, Fig. 9 This is a schematic diagram of the structure of a backlight driving unit provided in an embodiment of the present application. Fig. 9 As shown, the backlight driving module includes: a register unit 901 , a comparator 902 , an operation circuit 903 and an AND gate circuit 904 .

[0223] The register unit 901 and the operation circuit 903 can refer to the above Figure 8 The description of the corresponding components in the above will not be repeated in detail here. Figure 7B The description of the corresponding devices in will not be repeated in detail here.

[0224] AND gate circuit 904 is used to output signal A according to the determination result and signal B. When signal A is at level 7, it is used to indicate whether to adjust the screen brightness according to the first signal. When signal A is at level 8, it is used to indicate to adjust 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 embodiment of the present application does not specifically limit the values ​​of the seventh level and the eighth level.

[0226] The current source unit may determine whether to perform brightness adjustment according to the signal A and the first signal.

[0227] When signal A is at level 7 and the first signal is at level 1, brightness adjustment is performed. When signal A is at level 8, brightness adjustment is performed. When signal A is at level 7 and the first signal is at level 2, brightness adjustment is not performed until the first signal is at level 1, and brightness adjustment is performed.

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

[0229] In the above embodiment, in addition to the above method, the backlight driving module can also confirm the screen brightness before adjustment (for example, the brightness value stored in the register) in any other manner, etc. No specific limitation is made here.

[0230] In the above embodiment, the backlight driving module can obtain the first signal and the signal B from the processor and make a judgment through the two signals. In some embodiments, the processor can also control whether to adjust the brightness through a signal when the preset condition A and the preset condition C are met. The processor can also control whether to adjust the brightness through a signal when the preset condition A, the preset condition B and the preset condition C are met. The embodiment of the present application does not specifically limit the number of signals transmitted by the processor to the backlight driving module.

[0231] The above embodiment describes the structure of the display circuit. Fig. 10A The brightness adjustment method provided in the embodiment of the present application is described. For example, Fig. 10A A schematic diagram of a brightness adjustment method provided in an embodiment of the present application. Fig. 10A As shown, the method includes:

[0232] S1001: The backlight driving module receives a brightness modification instruction, which 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 can refer to the above corresponding description, which will not be described in detail here. Taking the LED light string current value as an example to confirm the screen brightness before adjustment, the preset condition B can be that the LED light string current value is less than the reference current. Fig. 7A Taking the circuit structure shown as an example, the preset condition B is that the voltage across the resistor R1 is less than the reference voltage Vref1. The specific form of the preset condition B is not limited in the embodiment of the present application.

[0235] If the screen brightness before adjustment does not satisfy the preset condition B, S1005 is executed. If the screen brightness before adjustment satisfies the preset condition B, S1003 is executed.

[0236] It can be understood that when the preset condition C is met, the brightness is confirmed to be modified to an extremely low brightness scene (also called a low brightness scene), and when the preset condition C is not met, the brightness is confirmed to be modified to a non-extremely low brightness scene (also called a high brightness scene).

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

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

[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 above corresponding description, which will not be described in detail here. Exemplarily, the preset condition C can be that the absolute value of the difference between the brightness value of the LED light string after adjustment and the brightness value of the LED light string before adjustment is less than the preset value A.

[0241] If the screen brightness before and after adjustment does not satisfy the preset condition C, S1005 is executed. If the screen brightness before and after adjustment satisfies the preset condition C, S1004 is executed.

[0242] It can be understood that when the preset condition C is met, the brightness modification is confirmed as a fine-tuning scene (small-range adjustment), and when the preset condition C is not met, the brightness modification is confirmed as a non-fine-tuning scene (large-range adjustment).

[0243] In this way, when the brightness adjustment range is large, there is no need to wait for the display image to darken, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness; when the brightness adjustment range is small, wait for the display image to darken before adjusting the brightness, which reduces brightness jumps and improves user experience.

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

[0245] For example, Figure 8 Taking 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.

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

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

[0248] If the displayed image meets the preset condition A, S1005 is executed. If the displayed image does not meet the preset condition A, S1014 is continued to be executed until the displayed image meets the preset condition A, and then S1005 is executed.

[0249] In this way, the screen brightness is adjusted when the display image is dark, reducing the user's perception of screen brightness jumps and improving 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 the port 3b.

[0251] S1005: Adjust brightness.

[0252] In summary, when the display screen of the electronic device is brighter, the brightness adjustment is not performed to reduce the brightness jump; when the display screen of the electronic device is darker, the brightness adjustment can be performed to make it difficult for users to perceive the change in screen brightness, thereby improving the user experience.

[0253] Above Figures 6 to 10A In the illustrated embodiments, the backlight driver module is used to confirm whether the preset conditions (preset condition A, preset condition B, preset condition C) are met. In other embodiments, the processor may also confirm whether to send a brightness modification instruction to the backlight driver 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 preset condition A is met, a brightness modification instruction is issued; when preset condition A is not met, it is further determined whether preset condition A is met.

[0255] Taking preset condition A and preset condition B as an example, the processor may issue a brightness modification instruction when preset condition B is not satisfied; the processor may confirm whether preset condition A is satisfied when preset condition B is satisfied; issue a brightness modification instruction when preset condition A is satisfied; and continue to determine whether preset condition A is satisfied when preset condition A is not satisfied.

[0256] Taking preset condition A and preset condition B as an example, the processor may issue a brightness modification instruction when preset condition B is not satisfied; the processor may confirm whether preset condition A is satisfied when preset condition B is satisfied; issue a brightness modification instruction when preset condition A is satisfied; and continue to determine whether preset condition A is satisfied when preset condition A is not satisfied.

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

[0258] For example, Fig. 10B This is a flow chart of another brightness adjustment method provided by this application. Fig. 10B As shown, the method includes:

[0259] S1011: The processor receives an operation for instructing screen brightness adjustment or detects a change in ambient light, and obtains a second brightness;

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

[0261] The preset condition B can refer to the above corresponding description, which will not be described in detail here. Taking the LED light string current value to confirm the screen brightness before adjustment as an example, the preset condition B can be that the LED light string current value is less than the reference current.

[0262] If the screen brightness before adjustment does not satisfy the preset condition B, S1015 is executed. If the screen brightness before adjustment satisfies the preset condition B, S1013 is executed.

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

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

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

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

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

[0268] In this way, when the brightness adjustment range is large, there is no need to wait for the display image to darken, which can shorten the brightness adjustment time and meet the user's need to quickly adjust the screen brightness; when the brightness adjustment range is small, wait for the display image to darken before adjusting the brightness, which reduces brightness jumps and improves user experience.

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

[0270] For example, Figure 8 Taking 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 determines whether the brightness of the display screen meets preset condition A.

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

[0273] If the displayed image meets the preset condition A, S1015 is executed. If the displayed image does not meet the preset condition A, S1014 is continued to be executed until the displayed image meets the preset condition A, and then S1015 is executed.

[0274] In this way, the screen brightness is adjusted when the display image is dark, reducing the user's perception of screen brightness jumps and improving 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 the port 3b.

[0276] In some embodiments, if S1012 is not executed, the brightness modification scene can be adjusted to a fine-tuning scene when the preset condition C is met, and the brightness modification scene can be adjusted to a non-fine-tuning scene when the preset condition C is not met. In this way, the scenes are distinguished to facilitate the subsequent determination of whether to continue to execute S1014, thereby reducing the situation of repeated execution of S1013.

[0277] If S1012 is executed, when the preset conditions B and C are met, the brightness modification scene can be adjusted to the fine-tuning scene to distinguish the scenes, which is convenient for subsequent judgment on whether to continue to execute S1014. In this way, the scenes are distinguished, which is convenient for subsequent judgment on whether to continue to execute S1014, and the situation of repeated execution of S1012 and S1013 is reduced.

[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 may correspond to different values ​​of the same register. Exemplarily, the value of the register corresponding to the fine-tuning scenario may be 1, and the value of the register corresponding to the non-fine-tuning scenario may be 2. No specific limitation is made here.

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

[0280] S1016: The backlight driving module adjusts the brightness.

[0281] In summary, when the electronic device displays a bright screen, the brightness adjustment is not performed to reduce brightness jumps; when the electronic device displays a dark screen, the brightness adjustment can be performed to make it difficult for users to perceive changes in screen brightness, thereby improving user experience.

[0282] It should be noted that the processor in the above embodiment can also be replaced by any other device with corresponding functions, such as a system on chip (SOC), a microcontroller unit (MCU), etc. The backlight driver module in the above embodiment can also be called a backlight driver circuit (backlight IC). The backlight driver module can also be replaced by 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 driver module.

[0283] The above embodiment describes whether to trigger the adjustment of the brightness of the backlight source. The following describes the adjustment principle of the backlight source in conjunction with a specific circuit.

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

[0285] In this way, all the light strings of the backlight source are powered by one power supply.

[0286] It is understandable that the output voltage of the battery is usually lower than the operating voltage of the LED light string. Therefore, the voltage adjustment unit usually has a boost function.

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

[0288] The structure of the voltage adjustment unit is described below by taking the example of the voltage adjustment unit boosting the output voltage of the battery.

[0289] For example, Fig.11 This is a schematic diagram of the structure of a voltage adjustment unit provided in an embodiment of the present application. Fig.11 As shown, the voltage adjustment unit includes: a boost circuit 1101 and a boost control circuit 1102. The boost circuit 1101 may include: an inductor L1, a switch tube Qn, a diode D1, resistors R2 and 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, and 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 switch tube Qn, and the second end of the switch tube Qn is grounded. The control end of the switch tube Qn is controlled by the boost control circuit 1102.

[0291] In some embodiments, the diode D1 may also be replaced by a switch tube, which is not specifically limited here.

[0292] The working principle of the boost circuit 1101 is described below.

[0293] When the switch 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 string. The voltage difference between the resistor R2 and the resistor R3 is the discharge voltage of the capacitor C1.

[0294] When the switch tube Qn is turned off, the inductor L1 can be discharged through the diode D1, the inductor current IL decreases linearly, and the output voltage Vout is maintained to slowly decrease by the discharge Ic of the capacitor C0 and the reduced inductor current IL. If the switch tube Qn is continuously turned off, Vout will eventually drop to 0V.

[0295] In the boost control circuit 1102, the output voltage of the boost circuit 1101 can be controlled by controlling the duty cycle of the switch tube 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 the 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 light string corresponding to each output end.

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

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

[0298] For example, Fig.12 A schematic diagram of another voltage adjustment unit provided in an embodiment of the present application. For example, a voltage adjustment unit including N output terminals, each of which corresponds to an LED light string, Fig.12 As shown, the voltage adjustment unit includes: SIMO circuit 1201 and boost control circuit 1202. SIMO circuit 1201 includes: an inductor, an upper switch tube, N lower switch tubes, 2N resistors and N capacitors. Among them, any output end can correspond to 1 switch tube, 2 resistors and 1 capacitor. The 1 switch tube, 2 resistors and 1 capacitor can form a boost circuit with the inductor and the upper switch tube.

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

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

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

[0302] It should be noted that the output voltage of each output terminal can be controlled by controlling the duty cycle of the upper switch tube Q and the on and off of each lower switch tube.

[0303] In some embodiments, in an on-off cycle of the upper switch tube Q, each lower switch tube is controlled to be turned on respectively. At the same time, one lower switch tube is turned on, and the other lower switch tubes are turned off.

[0304] For example, Fig.13 A timing diagram provided in an embodiment of the present application. Fig.13 As shown, the time from t0 to t4 is taken as an example of an on-off cycle of the switch tube Q.

[0305] At time t0, the switch tube Q is turned on; from time t0 to time t1, the switch tube Q is continuously turned on, and the switch tubes Q1, Q2, and Q3 are all turned off. The inductive current IL of the inductor L2 increases.

[0306] At time t1, switch Q is turned off, switch Q1 is turned on, and switch Q2 and switch Q3 remain turned off. From time t1 to time t2, switch Q1 is continuously turned on, and switch Q, switch Q2, and switch Q3 remain turned off. The inductive current IL of inductor L2 begins to decrease.

[0307] At time t2, switch Q is turned off, switch Q2 is turned on, and switch Q1 and switch Q3 remain turned off. From time t2 to time t3, switch Q2 continues to be turned on, and switch Q, switch Q1, and switch Q3 remain turned off. The inductive current IL of inductor L2 continues to decrease.

[0308] At time t3, switch Q is turned off, switch Q3 is turned on, and switch Q1 and switch Q2 remain turned off. From time t3 to time t4, switch Q3 continues to be turned on, and switch Q, switch Q1, and switch Q2 remain turned off. The inductive current IL of inductor L2 continues to decrease.

[0309] In this way, by controlling the conduction time of each lower switch tube, the output voltage of the corresponding output terminal of the controller can be controlled.

[0310] In some other embodiments, in one on-off cycle of the upper switch tube Q, only one lower switch tube is turned on, and the other lower switch tubes are kept off. The output voltage control of each output terminal is achieved through multiple cycles.

[0311] For example, Fig.14 A timing diagram provided in an embodiment of the present application. Fig.14 As shown, at time t0, switch tube Q is turned off and switch tube Q1 is turned on; from time t0 to time t1, switch tube Q1 is continuously turned on, and switch tubes Q, Q2, and Q3 are all turned off. The inductive current IL of inductor L2 begins to decrease.

[0312] At time t1, the switch tube Q is turned on, and the switches Q1, Q2, and Q3 are all turned off. From time t1 to time t2, the switch tube Q is continuously turned on, and the switches Q1, Q2, and Q3 are all turned off. The inductive current IL of the inductor L2 begins to increase.

[0313] At time t2, switch Q is turned off, switch Q2 is turned on, and switch Q1 and switch Q3 remain turned off. From time t2 to time t3, switch Q2 is continuously turned on, and switch Q, switch Q1, and switch Q3 remain turned off. The inductive current IL of inductor L2 begins to decrease.

[0314] At time t3, the switch tube Q is turned on, and the switch tubes Q3, Q1, and Q2 are all turned off. From time t3 to time t4, the switch tube Q is continuously turned on, and the switch tubes Q1, Q2, and Q3 are all turned off. The inductive current IL of the inductor L2 begins to increase.

[0315] At time t4, switch Q is turned off, switch Q3 is turned on, and switch Q1 and switch Q2 remain turned off. From time t4 to time t5, switch Q3 continues to be turned on, and switch Q, switch Q1, and switch Q2 remain turned off. The inductive current IL of inductor L2 begins to decrease.

[0316] At time t5, the switch tube Q is turned on, and the switch tubes Q3, Q1, and Q2 are all turned off. The inductive current IL of the inductor L2 begins to increase.

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

[0318] It should be noted that, since the output voltage required by each LED light string is different, the duty cycle of the lower switch tube corresponding to the output end corresponding to each LED light string is different.

[0319] In the embodiment of the present application, the boost control circuit 1202 can adjust the output voltage of each output terminal one by one (which can also be understood as adjusting the duty cycle of the lower switch tube) to reduce the amount of calculation; it can also adjust the output voltage of each output terminal at the same time (which can also be understood as adjusting the duty cycle of the lower switch tube), which is not specifically limited here.

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

[0321] It is understandable that due to manufacturing processes and other reasons, different LED lamps have different voltage drops, and thus different light strings have different conduction voltage drops. Therefore, if the LED light strings in the backlight source are connected using a common anode design, the output voltage of the voltage adjustment unit must be greater than the maximum voltage drop voltage among all LED light strings in the backlight source. In addition, the current source also has a certain voltage drop, so the output voltage of the voltage adjustment unit is usually greater than the sum of the maximum voltage drop voltage among all LED light strings and the fixed voltage value Voffset.

[0322] If the LED light strings in the backlight source correspond to different output terminals, the output voltages of the output terminals of the voltage adjustment unit may 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 LED light strings. The output voltages of the voltage adjustment unit do not need to be greater than the sum of the maximum voltage drop voltage among all LED light strings and the fixed voltage value.

[0323] For example, Fig.15 A schematic diagram of the voltage required for each LED light string provided in an embodiment of the present application. Fig.15 As shown, taking the backlight source including LED light string 1, LED light string 2, LED light string 3, LED light string 4, LED light string 5 and LED light string as an example, the conduction voltage drop required by each LED light string is different.

[0324] If the six LED light strings are connected using a common anode design, the output voltage of the voltage adjustment unit must be greater than the sum of the maximum voltage drop among the six LED light strings and the fixed voltage value. For example, the output voltage of the voltage adjustment unit may be Vout4.

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

[0326] Exemplarily, the output voltages of the output terminals corresponding to LED light string 1, LED light string 2, LED light string 3, LED light string 4, LED light string 5 and LED light string 6 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 light string can be powered separately, thereby reducing power consumption loss caused by excessive output voltage of the voltage adjustment unit.

[0328] For example, a single LED light string includes 12 LED lights. The voltage drop VF of a single LED light is usually between 2.7V and 2.9V. The voltage drop VFsum of the LED light string is VF*12, that is, between 32.4 and 34.8V. If there is a LED light string with a maximum voltage drop VFSUM_MAX, that is, 34.8V; the voltage drop of the remaining light strings is the minimum voltage drop VFSUM_MIN, that is, 32.4V. If the voltage Vheadroom of the current source is 0.5V, the current ILED of a single LED light string is 25mA.

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

[0330] In the schemes with different output ends, the total power consumption Pt is (VFSUM_MAX+Voffset1)*ILED+(VFSUM_MIN+Voffset1)*ILED*7. It can be understood that according to the IV characteristic curve of the backlight LED lamp (light-emitting diode), Voffset1 is very small and is not of 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, the backlight driving module may adjust the current of the LED light string through a current source after confirming that the brightness adjustment is to be performed.

[0332] In some other embodiments, after confirming that the brightness adjustment is to be performed, the backlight driving module may first adjust the output voltage of each output terminal, and then adjust the current of the LED light string through the current source.

[0333] In the present application embodiment, due to Fig.12 In the circuit shown, the output voltage of each output terminal is independent, so the current of each LED string can be roughly adjusted by adjusting the output voltage VBOOSTx of each output terminal until the actual string current reaches the required string current. After completing the VBOOSTx voltage regulation, the current source connected to the cathode of the LEDx string can further fine-tune the string current. In this way, the output voltage VBOOSTx of each output terminal can be further compressed.

[0334] For example, Fig.16 The following is a flow chart of a method for adjusting the brightness of a backlight source provided in an embodiment of the present application. Fig.16 As shown, the method includes:

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

[0336] S1602: After confirming that the brightness adjustment is to be performed, the output voltage VBOOSTx of each output terminal is adjusted according to the adjusted current of the LED light string and the preset value B.

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

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

[0339] S1603: when the absolute value of the difference between the actual light string current and the adjusted LED light string current is less than a preset value B, the output voltage of each output terminal is increased 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 light string, the current source unit can determine a preset voltage corresponding to the light string according to a fixed voltage value Voffset; and the voltage adjustment unit adjusts the voltage of the output end corresponding to the LED light 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; and the subsequent voltage adjustment unit can adjust the output voltage based on the updated preset voltage.

[0342] The current source unit may also transmit a 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, regulating the current of the LED light string through a current source.

[0344] When the absolute value of the difference between the actual light string current and the adjusted LED light string current is smaller than the preset value C, the adjustment is stopped.

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

[0346] In this way, the current of the LED light string is roughly adjusted by adjusting the output voltage first, and then finely adjusted by the current source, which can reduce the current regulation variation of the current source and reduce the power consumption of the current source.

[0347] It is understandable that if the processor can also confirm whether to send a brightness modification instruction to the backlight driver module by confirming whether the preset conditions (preset condition A, preset condition B, preset condition C) are met, the processor has determined whether to adjust the brightness before sending the brightness modification instruction; the backlight driver module does not need to confirm whether to adjust the brightness before executing S1602.

[0348] The embodiment of the present application provides a backlight driving module. The backlight driving module can be implemented to include 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 solution in the above embodiment. Its implementation principle and technical effect are similar to those of the above related embodiments, and will not be repeated here.

[0349] The embodiment of the present application provides an LCD display screen. The display screen includes: a liquid crystal panel, a backlight source, and a backlight driving module described in any one of the above possible implementations. 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; and the backlight driving module is used to adjust the intensity of the light emitted by the backlight source.

[0350] An embodiment of the present application provides an electronic device, which includes: the possible LCD display screens described above.

[0351] It should be noted that the module names involved in the embodiments of the present application can be defined as other names as long as the functions of each module can be achieved, and there is no specific restriction on the names of the modules.

[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 used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0353] The method provided in the embodiment of the present application has been described above, and the device for executing the above method provided in the embodiment of the present application is described below. Those skilled in the art can understand that the method and the device can be combined and referenced with each other, and the relevant device provided in the embodiment of the present application can execute the steps in the above method.

[0354] The method provided in the embodiment of the present application can be applied to an electronic device with a display function. The electronic device includes a terminal device, and the specific device form of the terminal device can refer to the above related description, which will not be repeated here.

[0355] An embodiment of the present application provides an electronic device, which includes: one or more processors and a memory; the memory is coupled to the one or more processors, 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 embodiment of the present application provides a chip or chip system. The chip or 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 solution in the above embodiment. Its implementation principle and technical effect are similar to those of the above-mentioned related embodiments, and will not be repeated here.

[0357] The embodiment of the present application also provides a computer-readable storage medium. The computer-readable storage medium includes computer instructions, and when the computer instructions are run on an electronic device, the electronic device executes the above method. The method described in the above embodiment can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the function can be stored as one or more instructions or codes on a computer-readable medium or transmitted on a computer-readable medium. Computer-readable media may include computer storage media and communication media, and may also include any medium that can transfer a computer program from one place to another. The storage medium can be any target medium that can be accessed by a computer.

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

[0359] An embodiment of the present application provides a computer program product, which includes a computer program code. When the computer program code is executed, the computer executes the above method.

[0360] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processing unit of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable device to generate a machine, so that the instructions executed by the processing unit of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0361] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present invention should be included in the scope of protection 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.

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 a 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 3, characterized in that The method further includes: if the first brightness does not satisfy the second preset condition, adjusting the brightness of the backlight source according to the second brightness.

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

6. 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.

7. The method according to claim 6, 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.

8. The method according to claim 6 or 7, 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.

9. 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.

10. The method according to claim 9, 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.

11. The method according to any one of claims 1 to 4, 6, 9 or 10, 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.

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

13. The backlight driving module according to claim 12, 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, where 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.

14. The backlight driving module according to claim 13, 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.

15. The backlight driving module according to claim 14, 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.

16. The backlight driving module according to claim 14, 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.

17. The backlight driving module according to claim 14, 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.

18. The backlight driving module according to claim 14, 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.

19. The backlight driving module according to claim 18, 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.

20. 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 12 to 19; 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.

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

22. 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 11.

23. 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 executes the method according to any one of claims 1 to 11.

Images