Backlight control circuit and method, display device and electronic equipment

Abstract

The invention relates to a backlight control circuit and method, a display device and electronic equipment. The backlight control circuit comprises a backlight assembly, a backlight controller and a time schedule controller, the backlight assembly provides a backlight source, and after the time schedule controller is powered on, the first dimming signal is received, and it is indicated that the brightness of the backlight source needs to be adjusted to the first brightness. When a backlight control signal received by the backlight controller is switched from a low level to a high level, the time sequence controller firstly outputs a second dimming signal to the backlight controller so as to adjust the brightness of the backlight source from the darkest to a second brightness corresponding to the second dimming signal, and the second brightness is lower than the first brightness. Afterwards, the time sequence controller continues to output a third dimming signal, so that the brightness of the backlight source is progressively increased from the second brightness until the first brightness is reached, smooth progressive increase of the backlight brightness is achieved instead of being directly changed from the darkest brightness to the first brightness, the dazzling condition is avoided, and then the user experience is improved.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and in particular to a backlight control circuit, method, display device, and electronic equipment. Background Technology

[0002] The backlight brightness of notebook devices (such as laptops) is typically adjusted using a timing control IC (TCON) and a backlight controller.

[0003] When a laptop wakes up from sleep, the front-end system of the laptop sets the backlight brightness and inputs the dimming signal corresponding to the backlight brightness to the timing controller. The timing controller outputs the dimming signal to the backlight controller to control the brightness of the backlight source to reach the set backlight brightness.

[0004] However, when waking from sleep, if the set backlight brightness is high, the backlight source will be too bright, which may cause glare and result in a poor user experience. Summary of the Invention

[0005] This application provides a backlight control circuit, method, display device, and electronic device to avoid glare from the backlight source and improve the user experience, thereby at least partially solving the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a backlight control circuit is provided, comprising: Backlight assembly, used to provide a backlight source; A backlight controller, connected to the backlight assembly, is used to receive backlight control signals and control the brightness of the backlight source; The timing controller, connected to the backlight controller, is configured as follows: After power-on, a first dimming signal is received; wherein, the first dimming signal is used to trigger the brightness of the backlight source to be adjusted to a first brightness; When the backlight control signal switches from low level to high level, a second dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to a second brightness; wherein the second brightness is lower than the first brightness; A third dimming signal is output to the backlight controller to control the backlight controller to increase the brightness of the backlight source from the second brightness until the brightness of the backlight source reaches the first brightness.

[0007] In some embodiments, after the brightness of the backlight source reaches the first brightness, the timing controller is further configured to: Receive a fourth dimming signal; wherein the fourth dimming signal is used to trigger the brightness of the backlight source to be adjusted to a third brightness; The fourth dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to the third brightness.

[0008] In some embodiments, the duty cycle of the first dimming signal is a first duty cycle; The duty cycle of the second dimming signal is a second duty cycle, which is less than the first duty cycle; The duty cycle of the third dimming signal is a third duty cycle, which is greater than the second duty cycle.

[0009] In some embodiments, the timing controller is further configured to: A second dimming signal is output to the backlight controller to control the backlight controller to output the drive current corresponding to the second duty cycle to the backlight source.

[0010] In some embodiments, when the difference between the third duty cycle of the third dimming signal and the first duty cycle is less than or equal to a preset difference, the brightness of the backlight source reaches the first brightness.

[0011] In some embodiments, the second duty cycle is preset; or, The second duty cycle is positively correlated with the ambient brightness of the backlight source.

[0012] In some embodiments, the timing controller is further configured to: The third dimming signal is continuously output; The duty cycle of the continuously output third dimming signal increases linearly. or, The duty cycle of the continuously output third dimming signal increases exponentially; or, The duty cycle of the continuously output third dimming signal increases linearly in a piecewise manner.

[0013] According to a second aspect of this application, a backlight control method is provided, applied to a timing controller of a backlight control circuit as described in the first aspect above, the method comprising: After power-on, a first dimming signal is received; wherein, the first dimming signal is used to trigger the brightness of the backlight source to be adjusted to a first brightness; When the backlight control signal switches from low level to high level, a second dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to a second brightness; wherein the second brightness is lower than the first brightness; A third dimming signal is output to the backlight controller to control the backlight controller to increase the brightness of the backlight source from the second brightness until the brightness of the backlight source reaches the first brightness.

[0014] According to a third aspect of this application, a chip is provided, including a memory storing a plurality of instructions; a processor loads instructions from the memory to execute steps in any of the backlight control methods provided in the embodiments of this application.

[0015] Optionally, the processor may include a timing controller.

[0016] According to a fourth aspect of this application, a computer-readable storage medium is provided, which stores a plurality of instructions adapted for loading by a processor to perform the steps in any of the backlight control methods provided in this application.

[0017] According to a fifth aspect of this application, a computer program product is provided, comprising a computer program or instructions that, when executed by a processor, implement the steps of any of the backlight control methods provided in this application.

[0018] According to a sixth aspect of this application, a display device is provided, including a display panel and a backlight control circuit as described in the first aspect above; The display panel includes a pixel array having multiple pixel units arranged in an array; The backlight component in the backlight control circuit is used to provide a backlight source to the display panel.

[0019] According to a sixth aspect of this application, an electronic device is provided, including a host and a display device as described above; The host is connected to the timing controller and the backlight controller circuit respectively. The host is used to output the first dimming signal to the timing controller and the backlight control signal to the backlight controller when the electronic device wakes up from sleep.

[0020] The backlight control circuit provided in this application includes a backlight assembly, a backlight controller, and a timing controller. After the timing controller is powered on, it receives a first dimming signal, indicating that the brightness of the backlight source in the backlight assembly needs to be adjusted to a first brightness level. When the backlight control signal received by the backlight controller switches from a low level to a high level, indicating that the backlight source needs to be turned on, the timing controller can control the brightness of the backlight source to gradually increase. That is, instead of directly adjusting the brightness of the backlight source to the first brightness level, it first outputs a second dimming signal to the backlight controller, which adjusts the brightness of the backlight source from the dimmest level to the second brightness level corresponding to the second dimming signal. This second brightness level is lower than the first brightness level, meaning the brightness of the backlight source is first adjusted to a dimmer level. Afterwards, the timing controller can continue to output a third dimming signal, which, through the backlight controller, gradually increases the brightness of the backlight source from the second brightness level until it reaches the first brightness level. This achieves a smooth increase in backlight brightness, rather than a direct jump from the dimmest level to the first brightness level, avoiding glare and improving the user experience.

[0021] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a backlight control circuit provided in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a backlight control circuit provided in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of a dimming signal duty cycle provided in an embodiment of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of a backlight control circuit provided in an embodiment of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of a dimming signal duty cycle provided in an embodiment of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the structure of a backlight control circuit provided in an embodiment of the present invention. Figure 4 ; Figure 9 This is a schematic diagram of a dimming signal duty cycle provided in an embodiment of the present invention. Figure 3 ; Figure 10 This is a schematic flowchart of a backlight control method provided in an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] The liquid crystal display (LCD) in notebook devices (such as laptops) typically uses pulse width modulation (PWM) dimming. In the backlight control circuit of the liquid crystal module (LCM), the PWM dimming signal enters the timing controller and then the backlight controller (also known as the backlight driver chip) to adjust the brightness of the backlight source of the LCD through the timing controller and the backlight controller.

[0025] When a laptop wakes up from sleep mode, the laptop's front-end system (or host, computer system) sets the backlight brightness and inputs the corresponding PWM dimming signal (or PWMI dimming signal) to the timing controller. The timing controller then outputs the corresponding PWM dimming signal (or PWMO dimming signal) to the backlight controller to control the backlight source brightness to reach the set backlight brightness.

[0026] In this context, the duty cycle of the PWMO dimming signal is equal to that of the PWMI dimming signal. It can be understood that the duty cycle of a signal refers to the ratio of the duration of a high-level signal within one cycle to the total signal cycle.

[0027] For example, taking a laptop computer as an example, such as Figure 1 As shown, when a laptop wakes up from sleep mode, the laptop's host outputs a 3.3V power supply voltage to the power management IC (PMIC). The PMIC then powers the timing controller, which in turn starts operating. The timing controller receives a PWMI dimming signal from the host, with a duty cycle of 55.2%, triggering the backlight brightness to be adjusted to brightness level 1. The duty cycle of the PWMI dimming signal is set by the host; in other words, brightness level 1 is the backlight brightness set by the host for wake-up from sleep mode.

[0028] Subsequently, the timing controller outputs a PWM0 dimming signal with a duty cycle of 55.2% to the backlight controller, controlling the backlight controller to adjust the brightness of the backlight assembly to brightness level 1. The duty cycle determines the backlight brightness. A higher duty cycle indicates a longer high-level duration, resulting in higher backlight brightness. Conversely, a lower duty cycle results in lower backlight brightness. Simply put, as... Figure 2 As shown, the host outputs backlight brightness 1 to the timing controller, the timing controller receives backlight brightness 1, and controls the brightness of the backlight source to reach backlight brightness 1.

[0029] In addition, as mentioned above Figure 1 As shown, the host sends a backlight control signal to the backlight controller. During sleep / wake-up, the backlight control signal sent by the host to the backlight controller switches from a low level to a high level. For example, the backlight control signal is the BL_EN signal.

[0030] When a laptop device wakes up from sleep mode, the timing controller typically outputs a corresponding backlight brightness setting from the front-end system. This ensures the display panel's backlight brightness reaches the set level, causing the timing controller's PWM0 dimming signal to follow the PWMI dimming signal (e.g., ...). Figure 3 As shown in the diagram, this is to achieve the set backlight brightness. When the front-end system sets a high backlight brightness, the backlight brightness will switch directly from the dimmest (sleep state) to the brightest (the set backlight brightness) during the wake-up process, resulting in glare. As the backlight brightness of the laptop device is set higher and higher, the glare becomes more and more obvious during sleep wake-up, resulting in a poor user experience.

[0031] In addition, after the laptop device is working normally, the PWMO dimming signal of the timing controller also follows the PWMI dimming signal (as described above). Figure 3 As shown in the figure, this ensures that the actual backlight brightness matches the backlight brightness set by the front-end system.

[0032] In this context, the PWMO dimming signal following the PWMI dimming signal can be understood as the duty cycle of the PWMO dimming signal being consistent with that of the PWMI dimming signal.

[0033] It should be noted that during the normal boot-up process of a laptop, the screen may also switch directly from the darkest to the brightest. However, since the interface displayed during the boot-up process usually includes patterns (such as logos), the visual glare is not very noticeable.

[0034] Therefore, to address the aforementioned issues, this application provides a backlight control circuit. During sleep / wake-up, the timing controller in the backlight control circuit does not directly follow the backlight brightness setting of the front-end system. Instead, it smoothly transitions the brightness of the backlight component to the set backlight brightness, avoiding a direct switch from the dimmest to the brightest backlight, thus preventing glare and improving the user experience.

[0035] The backlight control circuit provided in this application will be described in detail below. Figure 4 As shown, the backlight control circuit includes: Backlight assembly, used to provide a backlight source; A backlight controller, connected to the backlight assembly, is used to receive backlight control signals and control the brightness of the backlight source. The timing controller, connected to the backlight controller, is configured as follows: After power-on, a first dimming signal is received; wherein, the first dimming signal is used to trigger the adjustment of the brightness of the backlight source to a first brightness; When the backlight control signal switches from low level to high level, a second dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to a second brightness; wherein the second brightness is lower than the first brightness; A third dimming signal is output to the backlight controller to control the backlight controller to increase the brightness of the backlight source from the second brightness until the brightness of the backlight source reaches the first brightness.

[0036] In this embodiment, after the timing controller is powered on, it receives a first dimming signal, indicating that the brightness of the backlight source needs to be adjusted to a first brightness, which is the set backlight brightness. When it is determined that the backlight control signal received by the backlight controller switches from a low level to a high level, it indicates that the backlight source is currently in a turned-off state and needs to be turned on. Therefore, the timing controller can gradually increase the brightness of the backlight source. The timing controller can first output a second dimming signal to the backlight controller to adjust the brightness of the backlight source to a brightness lower than the first brightness (i.e., the second brightness).

[0037] Then, the timing controller continuously outputs a third dimming signal to the backlight controller, that is, it outputs multiple third dimming signals to continuously increase the brightness of the backlight source. When the brightness of the backlight source reaches the set first brightness, it indicates that the brightness of the backlight source has reached the set brightness, so the brightness of the backlight source can be stopped from increasing further, so that the brightness of the backlight source is consistent with the set brightness.

[0038] Optionally, the backlight brightness can be adjusted by the duty cycle. The duty cycle of the first dimming signal is the first duty cycle.

[0039] The duty cycle of the second dimming signal is the second duty cycle, which is less than the first duty cycle.

[0040] The duty cycle of the third dimming signal is the third duty cycle, which is greater than the second duty cycle.

[0041] Accordingly, if the difference between the third duty cycle and the first duty cycle of the third dimming signal output by the timing controller is less than or equal to a preset difference, the timing controller can determine that the duty cycle of the third dimming signal is consistent with the first duty cycle. In other words, the brightness of the backlight source reaches the first brightness, so that the backlight brightness reaches the set brightness. In this way, the timing controller stops increasing the duty cycle of the third dimming signal, so that the actual backlight brightness always follows the set backlight brightness.

[0042] Optionally, the second duty cycle is preset, such as 2%. For example, if the backlight control circuit is used to control the backlight brightness of electronic devices (such as laptops), then the second duty cycle can be the duty cycle set by the host of the electronic device during sleep and wake-up.

[0043] or, The aforementioned second duty cycle is matched with the ambient brightness of the backlight source, and they are positively correlated. The darker the ambient brightness, the smaller the second duty cycle can be. In other words, the timing controller initially adjusts the backlight brightness to be lower to avoid the initial brightness of the backlight source being too bright in a dark environment, thus preventing glare.

[0044] For example, the second duty cycle can be determined by the electronic device (such as the host in the electronic device) where the backlight control circuit is located. In the case of sleep-wake, the host finds the duty cycle corresponding to the ambient brightness of the electronic device and uses it as the second duty cycle, and then outputs the second duty cycle to the timing controller.

[0045] In some embodiments, the duty cycles of the plurality of third dimming signals are linearly increasing. For example, the timing controller can determine the duty cycle increment for each step, gradually increasing the duty cycle in uniform steps until the first duty cycle is reached. Specifically, the incrementing duty cycle is determined based on a preset total transition time. For instance, the second duty cycle D0 = 2%, the first duty cycle Dmax = 55.2%, and the total transition time T = 690ms. If the PWM dimming signal period is 10ms, then the total number of transition steps N = T / signal period = 690ms / 10ms ≈ 69 steps. That is, the number of third dimming signals is 69.

[0046] The duty cycle increment per step ΔD = (Dmax - D0) / N = (55.2% - 2%) / 69 ≈ 0.771%; The incremental process is as follows: the duty cycle of the first third dimming signal is D = 2% + 0.771% ≈ 2.771%, the duty cycle of the second third dimming signal is D ≈ 3.542%, ..., the duty cycle of the 69th third dimming signal is D ≈ 55.2%.

[0047] Based on this, the duty cycle increment method is simple, requires low computing power from the timing controller, and can achieve a smooth transition of the duty cycle.

[0048] In other embodiments, the duty cycles of the aforementioned plurality of third dimming signals increase exponentially. Based on the characteristics of an exponential function, the duty cycle increment step is small in the initial stage (i.e., the backlight brightness increases slowly), the step size gradually increases in the middle stage, and then decreases again when approaching the set first duty cycle, eventually converging smoothly to the first duty cycle. Based on this, a smooth transition of duty cycle is achieved. Furthermore, considering that the human eye is more sensitive to changes in low brightness and less sensitive to changes in high brightness, exponential increment can avoid the abruptness of backlight brightness changes in the low brightness stage, conforming to the user's visual characteristics and improving the user experience.

[0049] In other embodiments, the duty cycles of the aforementioned plurality of third dimming signals increase linearly in a piecewise manner. For example, the entire transition process is divided into multiple stages, each stage using a different increment step size. For instance, a small step size is used in the low brightness stage (2%-20%), and a large step size is used in the medium-high brightness stage (20%-55.2%). This avoids the abruptness caused by an excessively large step size in the low brightness stage while ensuring transition efficiency.

[0050] In some embodiments, the backlight controller can resolve the duty cycle of the dimming signal, thereby outputting a drive current corresponding to that duty cycle to the backlight source. The magnitude of the current determines the brightness of the backlight source (such as an LED strip). For example, the timing controller outputs a second dimming signal to the backlight controller to control the backlight controller to output a drive current corresponding to the second duty cycle to the backlight source.

[0051] In some embodiments, the timing controller can directly control the brightness of the backlight source to smoothly transition to the first brightness after power-on and if it receives the first dimming signal, without needing to detect the backlight control signal level switching from low to high.

[0052] In some embodiments, the backlight control circuit described above may further include a power management chip. The power management chip can supply power to the timing controller, enabling the timing controller to operate. For example, the power management chip can convert an externally input DC voltage into the operating voltage required by the timing controller (e.g., 3.3V). Of course, the power management chip can also supply power to other devices (such as the backlight controller), and this application is not limiting in this regard.

[0053] In some embodiments, the dimming signal can be a PWM dimming signal. The first dimming signal is a PWMI dimming signal, and the second and third dimming signals are both PWMO dimming signals. The backlight control signal is the BL_EN signal.

[0054] In some embodiments, after the brightness of the backlight source reaches a first brightness, the timing controller is further configured to: Receive the fourth dimming signal; wherein the fourth dimming signal is used to trigger the adjustment of the backlight source brightness to the third brightness; Output the fourth dimming signal to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to the third brightness.

[0055] For example, after normal operation, the timing controller controls the brightness of the backlight source to follow the set backlight brightness (such as the host setting). Simply put, the PWMO dimming signal is consistent with the PWMI dimming signal.

[0056] In this application, after the timing controller is powered on, it receives a first dimming signal, indicating that the brightness of the backlight source in the backlight assembly needs to be adjusted to a first brightness level. When the backlight control signal received by the backlight controller switches from a low level to a high level, it indicates that the backlight source needs to be turned on. The timing controller can then control the brightness of the backlight source to gradually increase; that is, instead of directly adjusting the brightness to the first brightness level, it first outputs a second dimming signal to the backlight controller. The backlight controller then adjusts the brightness of the backlight source from the dimmest level to the second brightness level corresponding to the second dimming signal. This second brightness level is lower than the first brightness level, meaning the backlight source brightness is initially adjusted to a dimmer level. Afterward, the timing controller can continue to output a third dimming signal, which, through the backlight controller, gradually increases the brightness of the backlight source from the second brightness level until it reaches the first brightness level. This achieves a smooth increase in backlight brightness, rather than a direct jump from the dimmest to the first brightness level, avoiding glare and improving the user experience.

[0057] In some embodiments, this application also provides a display device, such as... Figure 5 As shown, the display device includes a display panel and a backlight control circuit as described above; The display panel includes a pixel array with multiple pixel units arranged in an array.

[0058] The backlight assembly in the backlight control circuit is used to provide the backlight source to the display panel.

[0059] In some embodiments, this application also provides an electronic device, such as Figure 6 As shown, the electronic device includes a host and the display device as described above.

[0060] The host is connected to the timing controller and the backlight controller circuits respectively, and the host outputs the backlight control signal to the backlight controller.

[0061] The host is used to output a first dimming signal to the timing controller and a high-level backlight control signal to the backlight controller when the electronic device wakes up from sleep.

[0062] In this embodiment, when the electronic device wakes up from sleep mode, the host outputs a first dimming signal to the timing controller, and the backlight control signal sent to the backlight controller switches from a low level to a high level. Upon receiving the first dimming signal and the backlight controller switching from a low level to a high level, the timing controller does not directly output the first dimming signal to the backlight controller. Instead, it outputs a second dimming signal to the backlight controller to control the backlight source to adjust from its dimmest setting to a lower brightness. Subsequently, the timing controller can continue to output a third dimming signal to the backlight controller to gradually increase the brightness of the backlight source until it reaches the first brightness corresponding to the first dimming signal.

[0063] In addition, after the electronic device is working normally, the timing controller can follow the backlight brightness set by the host. For example, after the first brightness is reached, the timing controller outputs the first dimming signal to the backlight controller so that the brightness of the backlight source follows the first brightness set by the host.

[0064] For example, the timing controller receives the fourth dimming signal from the host and outputs the fourth dimming signal to the backlight controller.

[0065] Optionally, as mentioned above, the dimming signal can be a PWM dimming signal.

[0066] For example, when an electronic device wakes up from sleep, the timing controller is powered on. The timing controller receives a PWMI dimming signal (i.e., the first dimming signal mentioned above) from the host, the duty cycle of which is 55.2%, thereby triggering the backlight brightness to be adjusted to brightness 1.

[0067] like Figure 7 As shown, when BL_EN switches from low to high, a smooth transition is initiated. The timing controller outputs a PWM0 dimming signal with a duty cycle of 55.2% (i.e., the second dimming signal mentioned above) to the backlight controller to control the backlight controller to adjust the brightness of the backlight component to brightness 1.

[0068] Subsequently, the timing controller outputs a PWM0 dimming signal (i.e., the third dimming signal mentioned above) with a gradually increasing duty cycle to the backlight controller, such as... Figure 7 The PWMO dimming signal shown has a duty cycle of 28.8%.

[0069] The smooth transition ends when the duty cycle of the PWMO dimming signal (i.e., the third dimming signal mentioned above) output by the timing controller is consistent with that of the PWMI dimming signal.

[0070] Simply put, such as Figure 8 As shown, the host outputs backlight brightness 1 to the timing controller. The timing controller receives backlight brightness 1 and first controls the brightness of the backlight source to reach backlight brightness 2, where backlight brightness 2 is less than backlight brightness 1. After that, the timing controller controls the brightness of the backlight source to smoothly transition to backlight brightness 1.

[0071] In this embodiment, when the electronic device wakes up from sleep mode, the timing controller does not directly output the duty cycle set by the front-end system. Instead, it gradually increases the duty cycle of the output dimming signal, so that the duty cycle of the output dimming signal gradually increases to the duty cycle set by the front-end system. Ultimately, this causes the PWM0 dimming signal of the timing controller to follow the PWMI dimming signal (e.g., ...). Figure 9 As shown in the figure, this allows for a gradual increase in backlight brightness until it matches the set backlight brightness.

[0072] In addition, after the electronic device is working normally, the PWMO dimming signal of the timing controller also follows the PWMI dimming signal (as described above). Figure 9 As shown in the figure, this ensures that the actual backlight brightness matches the backlight brightness set by the front-end system.

[0073] In some embodiments, the timing controller can actively detect whether the backlight control signal switches from a low level to a high level. For example, after the timing controller is powered on (VCC3.3 power supply starts), the timing controller samples the BL_EN signal to determine whether the backlight control signal has undergone a level switch.

[0074] For example, the timing controller has a built-in input pin corresponding to the BL_EN signal, which is connected to the BL_EN signal output circuit of the host to receive the level status of the BL_EN signal in real time.

[0075] In other embodiments, the level switching of the backlight control signal may be notified by the backlight controller.

[0076] like Figure 10 As shown, to avoid glare, this embodiment also provides a backlight control method executed by the timing controller, which includes steps S101-S103 executed by the timing controller.

[0077] S101. After power-on, receive a first dimming signal; wherein, the first dimming signal is used to trigger the adjustment of the brightness of the backlight source to a first brightness.

[0078] S102. When the backlight control signal switches from low level to high level, a second dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to a second brightness; wherein the second brightness is lower than the first brightness.

[0079] S103. Output a third dimming signal to the backlight controller to control the backlight controller to increase the brightness of the backlight source from the second brightness until the brightness of the backlight source reaches the first brightness.

[0080] The implementation process of S101-S103 can be found in the previous text, and will not be repeated here.

[0081] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor (such as the timing controller described above).

[0082] Therefore, embodiments of this application provide a computer-readable storage medium storing a computer program thereon, which is loaded by a processor to execute the steps described in the above-described method embodiments of this application. For example, the computer program loaded by the processor can execute the backlight control method as described above.

[0083] For details on the implementation of each of the above operations / steps, please refer to the previous examples, which will not be repeated here.

[0084] The computer-readable storage medium may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0085] Since the computer program stored in the computer-readable storage medium can execute the steps in any of the above method embodiments provided in the embodiments of this application, the beneficial effects that the methods described in any of the above method embodiments can achieve can be realized, as detailed in the preceding embodiments, and will not be repeated here.

[0086] This application also provides a chip, including a memory storing multiple instructions; a processor loads instructions from the memory to execute steps in any of the backlight control methods provided in this application.

[0087] This application also provides a computer program product or computer program that includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations of the above embodiments.

[0088] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A backlight control circuit, characterized in that, include: Backlight assembly, used to provide a backlight source; A backlight controller, connected to the backlight assembly, is used to receive backlight control signals and control the brightness of the backlight source; The timing controller, connected to the backlight controller, is configured as follows: After power-on, a first dimming signal is received; wherein, the first dimming signal is used to trigger the brightness of the backlight source to be adjusted to a first brightness; When the backlight control signal switches from low level to high level, a second dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to a second brightness; wherein the second brightness is lower than the first brightness; A third dimming signal is output to the backlight controller to control the backlight controller to increase the brightness of the backlight source from the second brightness until the brightness of the backlight source reaches the first brightness.

2. The backlight control circuit according to claim 1, characterized in that, After the backlight source reaches the first brightness, the timing controller is further configured to: Receive a fourth dimming signal; wherein the fourth dimming signal is used to trigger the brightness of the backlight source to be adjusted to a third brightness; The fourth dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to the third brightness.

3. The backlight control circuit according to claim 1 or 2, characterized in that, The duty cycle of the first dimming signal is the first duty cycle; The duty cycle of the second dimming signal is a second duty cycle, which is less than the first duty cycle; The duty cycle of the third dimming signal is a third duty cycle, which is greater than the second duty cycle.

4. The backlight control circuit according to claim 3, characterized in that, The timing controller is also used for: The second dimming signal is output to the backlight controller to control the backlight controller to output the drive current corresponding to the second duty cycle to the backlight source.

5. The backlight control circuit according to claim 3, characterized in that, When the difference between the third duty cycle and the first duty cycle of the third dimming signal is less than or equal to a preset difference, the brightness of the backlight source reaches the first brightness.

6. The backlight control circuit according to claim 3, characterized in that, The second duty cycle is preset; or, The second duty cycle is positively correlated with the ambient brightness of the backlight source.

7. The backlight control circuit according to claim 3, characterized in that, The number of the third dimming signals is multiple; Among them, the duty cycle of the multiple third dimming signals increases linearly; or, The duty cycles of the multiple third dimming signals increase exponentially; or, The duty cycles of the multiple third dimming signals increase linearly in a piecewise manner.

8. A backlight control method, characterized in that, The method, applied to a timing controller of a backlight control circuit as described in any one of claims 1 to 7, comprises: After power-on, a first dimming signal is received; wherein, the first dimming signal is used to trigger the brightness of the backlight source to be adjusted to a first brightness; When the backlight control signal switches from low level to high level, a second dimming signal is output to the backlight controller to control the backlight controller to adjust the brightness of the backlight source to a second brightness; wherein the second brightness is lower than the first brightness; A third dimming signal is output to the backlight controller to control the backlight controller to increase the brightness of the backlight source from the second brightness until the brightness of the backlight source reaches the first brightness.

9. A display device, characterized in that, Includes a display panel and a backlight control circuit as described in any one of claims 1 to 7; The display panel includes a pixel array having multiple pixel units arranged in an array; The backlight component in the backlight control circuit is used to provide a backlight source to the display panel.

10. An electronic device, characterized in that, Includes a host computer and a display device as described in claim 9; The host is connected to the timing controller and the backlight controller circuit respectively. The host is used to output the first dimming signal to the timing controller and output the high-level backlight control signal to the backlight controller when the electronic device wakes up from sleep.

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