WO2022089191A1

WO2022089191A1 - Backlight control method and apparatus, and electronic device, and computer readable storage medium

Info

Publication number: WO2022089191A1
Application number: PCT/CN2021/123190
Authority: WO
Inventors: 武勇; 钱立红
Original assignee: Oppo广东移动通信有限公司
Priority date: 2020-10-30
Filing date: 2021-10-12
Publication date: 2022-05-05
Also published as: CN112382240A

Abstract

A backlight control method and apparatus, and an electronic device, and a computer readable storage medium. The method comprises: obtaining a first duration in which a backlight duty ratio corresponding to the current backlight partition is greater than a preset maximum threshold; when the first duration is greater than a first time threshold, decreasing the maximum backlight duty ratio of the current backlight partition according to the preset maximum threshold; and when detecting that a scenario on a display screen is switched, restoring the maximum backlight duty ratio of each backlight partition of the display screen to a configuration value corresponding to the current display state of the display screen.

Description

Backlight control method, apparatus, electronic device, and computer-readable storage medium

This application claims the priority of the Chinese patent application filed on October 30, 2020 with the application number 2020111910345 and the application title is "Backlight Control Method, Device, Electronic Device and Readable Storage Medium", the entire content of which is approved by Reference is incorporated in this application.

technical field

The present application relates to the field of display screen display technology, and in particular, to a backlight control method, apparatus, electronic device and computer-readable storage medium.

Background technique

With the development of display technology, backlight modulation technology is usually used to control the brightness of the backlight, and the luminous effect of the backlight will directly affect the visual effect of the display.

When it is lit for a long time, the temperature of the light source will rise linearly, causing the temperature of the display device to rise and affecting the life of the lamp.

SUMMARY OF THE INVENTION

According to various embodiments disclosed in the present application, a backlight control method, apparatus, electronic device, and computer-readable storage medium are provided.

A backlight control method, executed by an electronic device, the method comprising:

obtaining a first duration of time in which the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold, where the current backlight partition is the backlight partition in the display screen;

When the first duration is greater than a first time threshold, reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold; and

When it is detected that the display screen scene is switched, the maximum backlight duty cycle of each backlight partition of the display screen is restored to the configuration value corresponding to the current display state of the display screen.

A backlight control device, comprising:

an obtaining module, configured to obtain a first duration of time when the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold, and the current backlight partition is the backlight partition in the display screen;

a reducing module, configured to reduce the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold when the first duration is greater than a first time threshold; and

The restoration module is used to restore the maximum backlight duty cycle of each backlight partition of the display screen to a configuration value corresponding to the current display state of the display screen when the scene switching of the display screen is detected.

A computer device comprising a memory and one or more processors, the memory storing computer-readable instructions that, when executed by the one or more processors, cause the one or more processors The processor executes the steps of the above-mentioned backlight control method.

One or more non-volatile computer-readable storage media having computer-readable instructions stored thereon that, when executed by one or more processors, cause the one or multiple processors to perform the steps of the above-mentioned backlight control method.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features and advantages of the present application will become apparent from the description, drawings, and claims

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is an application environment diagram of a backlight control method in one or more embodiments;

2 is a flowchart of a backlight control method in one or more embodiments;

3 is a flowchart of a backlight control method in another or more embodiments;

4 is a schematic flowchart of backlight control through first-layer logic in one or more specific embodiments;

FIG. 5 is a schematic flowchart of backlight control through second-layer logic in one or more specific embodiments;

6 is a schematic diagram of a maximum duty value allocation table corresponding to a current backlight partition when different display windows are accounted for in one or more embodiments;

7 is a structural block diagram of a backlight control apparatus in one or more embodiments;

8 is a schematic diagram of an internal structure of an electronic device in one or more embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various data, but these data are not limited by these terms. These terms are only used to distinguish the first data from another. For example, a first duration may be referred to as a second duration, and similarly, a second duration may be referred to as a first duration, without departing from the scope of this application. Both the first duration and the second duration are durations, but they are not the same duration.

FIG. 1 is a schematic diagram of an application environment of a backlight control method in one embodiment. As shown in FIG. 1 , the application environment includes a display screen 102, wherein the display screen 102 includes a plurality of backlight partitions, and each backlight partition includes at least one backlight source. The backlight brightness of the partition can be adjusted. Wherein, the display screen 102 can be, but is not limited to, a display screen of various televisions, personal computers, notebook computers, smart phones, tablet computers and portable wearable devices. According to the different images displayed on the display screen, each backlight partition has a corresponding backlight duty cycle, and obtain the first duration for which the backlight duty cycle corresponding to the current backlight partition is greater than the preset maximum threshold. When the first duration is greater than the first When the time threshold is set, the maximum backlight duty cycle of the current backlight partition is reduced according to the preset maximum threshold value. When the scene switching of the display screen is detected, the maximum backlight duty cycle of each backlight partition of the display screen is restored to the current display state of the display screen. the corresponding configuration value. When controlling the brightness of the backlight source in the prior art, the temperature rise of the display device is usually slowed down by adding a heat sink, which has the problem of increasing the cost of the display device.

FIG. 2 is a flowchart of a backlight control method in one embodiment. The backlight control method in this embodiment is described by taking the operation on the display screen 102 in FIG. 1 as an example. Method the following steps:

Step 202: Acquire a first duration of time when the duty cycle of the backlight corresponding to the current backlight partition is greater than a preset maximum threshold.

The current backlight partition is any one of the backlight partitions in the display. The duty cycle of the backlight refers to the ratio of the power-on time to the total time in a pulse cycle. For example, a pulse sequence with a pulse width of 1μs and a signal period of 4μs has a duty cycle The ratio is 0.25. In one embodiment, the display screen includes 210 backlight sub-regions, and each backlight sub-region includes 2 light tubes.

Specifically, the backlight duty cycle is adjusted in units of backlight partitions, and the preset maximum threshold may be different according to the properties of the lamp. In one embodiment, if a single lamp exceeds 60% of the duty, it will burn for more than 5 minutes. risk of bad lamps, so the preset max threshold can be set to 60%. The first duration can be obtained by counting the counters. Different backlight partitions correspond to different backlight duty ratios. In one embodiment, different maximum backlight duty cycles are allocated to the backlight partitions according to the display window ratio of the display screen. For example, when the window ratio is greater than the first preset window When the threshold is set, the backlight partition keeps the first preset maximum backlight duty cycle unchanged, and when the window ratio is less than the second preset window threshold, the backlight partition maintains the second preset maximum backlight duty cycle unchanged, wherein the first A preset window threshold is greater than the second preset window threshold, and the first preset maximum backlight duty ratio is smaller than the second preset maximum backlight duty cycle. When the window ratio is between the second preset window threshold and the first preset window threshold, the maximum backlight duty ratio corresponding to the backlight partition is decreased as the window ratio increases. In one embodiment, the first preset window threshold is 70%, the second preset window threshold is 15%, the first preset maximum backlight duty cycle is 40%, and the second preset maximum backlight duty cycle is 100%. That is, when the window ratio is less than 15%, the maximum backlight duty cycle corresponding to the backlight partition is 100%. When the window ratio is greater than or equal to 15% and less than or equal to 70%, as the window continues to increase, the corresponding backlight partition The maximum backlight duty cycle is continuously reduced until the window ratio is greater than 70%, and the maximum backlight duty cycle corresponding to the backlight partition remains unchanged at 40%.

Step 204, when the first duration is greater than the first time threshold, reduce the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold.

The first time threshold can be customized. In one embodiment, the first time threshold is an empirical value obtained according to the statistics of the video content and the characteristics of the human eye. For example, the first duration is 40s. Normally, a picture is maintained at the current The state generally does not exceed 40 seconds. For example, a sun is currently playing, and the brightness corresponding to the sun is the maximum value. If the lamp tube of the backlight zone corresponding to the sun position exceeds 40 seconds, the lamp tube of the backlight zone corresponding to the sun position will start to become hot, and the maximum value of the backlight zone of this position needs to be The backlight duty cycle is reduced, which reduces brightness and reduces lamp temperature.

Specifically, by reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold, the maximum backlight duty cycle of the current backlight partition can be gradually reduced to be equal to or less than the preset maximum threshold. The gradually decreasing algorithm can be customized. For example, you can customize the acceleration to gradually reduce the maximum backlight duty cycle of the current backlight partition, or you can gradually reduce the maximum backlight duty cycle of the current backlight partition at a constant speed. The reduction speed can be determined by reducing the preset magnitude by the preset number of frames.

Step 206 , when detecting the scene switching of the display screen, restore the maximum backlight duty cycle of each backlight partition of the display screen to a configuration value corresponding to the current display state of the display screen.

Specifically, scene switching means that the display content of the display screen changes in the scene. The scene switching can be detected by the extent of the change in the display content exceeding a preset threshold, and the scene switching can be detected by detecting the occupancy of the lamp that has changed beyond the preset gray level. More recently, it is determined whether a scene switch has occurred. The current display state of the display screen can be determined according to the configuration strategy of the maximum backlight duty cycle. If the configuration strategy is to determine the maximum backlight duty cycle of each backlight partition according to the window size, the current display state of the display screen is determined according to the current display screen of the display screen. The proportion of the display window, for example, the proportion of the display window corresponding to the current display picture is the moon is 20%, and the proportion of the display window corresponding to the current display picture is the star is 10%. When the configuration strategy is that the maximum backlight duty cycle of each backlight partition changes according to other display parameters, the current display state of the display screen can be other display parameters, such as the size of the area of interest. Restore the maximum backlight duty cycle of each backlight partition of the display screen to the configuration value corresponding to the current display state of the display screen, so that when scene switching occurs, the display of the screen is not affected by the previous adjustment of the maximum backlight duty cycle of the current backlight partition. , to ensure the display quality of the picture when scene switching occurs.

In the backlight control method in this embodiment, obtain the first duration time when the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold; when the first duration is greater than the first time threshold, decrease according to the preset maximum threshold The maximum backlight duty cycle of the current backlight partition; when the screen scene switching is detected, the maximum backlight duty cycle of each backlight partition of the display screen is restored to the configuration value corresponding to the current display state of the display screen. In this way, when the backlight duty cycle is continuously greater than the preset maximum threshold, the maximum backlight duty cycle of the current backlight partition can be automatically reduced, thereby reducing the brightness, reducing the temperature of the lamp tube, and prolonging the life of the lamp tube. The display of the picture is not affected by the previous adjustment of the maximum backlight duty cycle of the current backlight partition, which ensures the display quality of the picture when the scene is switched. There is no need to add additional heat dissipation devices, and the balance between display quality and heat dissipation is achieved. Cost control Guaranteed display quality.

In one embodiment, step 202 includes: counting the first duration by using a first timer corresponding to the current backlight partition. The backlight control method further includes: when the maximum backlight duty ratio of the current backlight partition is reduced according to the preset maximum threshold, clearing the first timer, and when the display screen scene is switched, clearing the first timer.

Specifically, each backlight partition has a corresponding first timer for counting the first duration, and when the first duration is greater than the first time threshold, the maximum backlight occupation of the current backlight partition is reduced according to the preset maximum threshold duty cycle, while clearing the first timer. In one embodiment, when the maximum backlight duty cycle of the current backlight partition is reduced to be equal to or less than a preset maximum threshold, the timing trigger function of the first timer is restarted, so that the next time the current backlight partition corresponds to the backlight duty cycle When it is greater than the preset maximum threshold, the timing function of the first timer can be triggered. When the maximum backlight duty cycle of the current backlight partition is gradually decreasing, the timing trigger function of the first timer is turned off. During the adjustment process, although the backlight duty cycle corresponding to the current backlight partition is greater than the preset maximum threshold, the The adjustment has already started, and there is no need to activate the timing function of the first timer. When the display screen scene is switched, the maximum backlight duty cycle of each backlight partition of the display screen is restored to the configuration value corresponding to the current display state of the display screen, and the first timer is cleared at this time, and the backlight corresponding to the next current backlight partition When the duty cycle is greater than the preset maximum threshold, the first timer starts to count again.

In this embodiment, when starting to adjust the maximum backlight duty cycle of the current backlight partition or switch the display screen scene, the first timer is cleared to make it easier for the first timer to work normally and keep the timing accurate. Clear to zero and count time intelligently.

In one embodiment, as shown in FIG. 3 , the backlight control method further includes:

Step 302 , using a second timer corresponding to the current backlight partition to count the second duration time for which the duty cycle of the backlight corresponding to the current backlight partition is greater than a preset maximum threshold.

Specifically, each backlight partition has a corresponding second timer, and the timing rule of the second timer is different from that of the first timer. When the display screen scene is switched, the second timer will not be cleared.

Step 304, when the second duration is greater than the second time threshold, reduce the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold, and clear the second timer, and the second time threshold is greater than the first time threshold.

The second time threshold can be customized, and the second time threshold is greater than the first time threshold. In one of the embodiments, the second time threshold is a critical value at which the lamp is at risk of burnout. For example, if a single lamp exceeds 60% of the duty and the time exceeds 5 minutes, the lamp may be at risk of burnout, the second time can be The threshold was set to 5 minutes.

Specifically, when the second duration is greater than the second time threshold, the maximum backlight duty cycle of the current backlight partition is decreased according to the preset maximum threshold, and the maximum backlight duty cycle of the current backlight partition can be gradually reduced to be equal to or less than the preset maximum backlight duty cycle. Set the maximum threshold. The gradually decreasing algorithm can be customized. For example, you can customize the acceleration to gradually reduce the maximum backlight duty cycle of the current backlight partition, or you can gradually reduce the maximum backlight duty cycle of the current backlight partition at a constant speed. The reduction speed can be determined by reducing the preset magnitude by the preset number of frames. At the same time, the second timer is cleared. Because the second timer will not be cleared when the screen scene is switched, if the screen keeps switching scenes, the timing time of the second timer reaches the second time threshold, such as 5 minutes, the duty should be lowered to reduce the current The maximum backlight duty cycle for the backlight partition.

In the backlight control method in this embodiment, through the auxiliary function of the second timer, when the display screen keeps switching scenes, the first timer is cleared and the duration of the backlight duty cycle greater than the preset maximum threshold cannot be counted. The second timer performs statistics, so that when the second time threshold is reached, the maximum backlight duty cycle of the current backlight partition is automatically reduced, so as to protect the lamp tube and prolong the life of the lamp tube.

In one embodiment, reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold includes: for the current backlight partition, gradually reducing the corresponding maximum backlight duty cycle according to the display image frame period until the maximum backlight duty cycle of the current backlight partition is reached. The backlight duty cycle is equal to or less than the preset maximum threshold.

Specifically, the display image frame period can be customized. For example, the display image frame period can be set to 4 frames, and the gradual decrease in each display image frame period can also be customized. For example, the gradual decrease can be set to 1% duty. , the duty is reduced by 1% every 4 frames, and the maximum backlight duty cycle of the current backlight partition is steadily reduced in each display image frame period until the maximum backlight duty cycle of the current backlight partition is equal to or less than the preset maximum threshold, and can be stopped. , the specific stop conditions can be customized.

The backlight control method in this embodiment can gradually reduce the heat of the lamp tube by steadily reducing the maximum backlight duty cycle of the current backlight partition in each display image frame period, and at the same time, the brightness of the displayed image will not change abruptly. Balance with heat dissipation, prolong lamp life, and ensure display quality while controlling costs.

In one embodiment, after reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold, the method further includes: acquiring a third duration for which the backlight duty cycle corresponding to the current backlight partition is smaller than the preset maximum threshold; when When the third duration is greater than the third time threshold, the maximum backlight duty cycle of the current backlight partition is increased.

A counter can be set to count the third duration of time when the duty cycle of the backlight corresponding to the current backlight partition is less than the preset maximum threshold. The third time threshold can be customized. In one embodiment, the third time threshold is equal to the second time threshold. , for 5 minutes.

Specifically, when the third duration of the backlight duty cycle corresponding to the current backlight partition is less than the preset maximum threshold and exceeds the third time threshold, the lamp has dissipated heat, and the maximum backlight duty cycle of the current backlight partition can be increased to restore it. to the initial value or restore to the configuration value corresponding to the current display state of the display. To increase the maximum backlight duty cycle of the current backlight partition, you can gradually increase it according to a custom algorithm. For example, you can customize the acceleration to gradually increase the maximum backlight duty cycle of the current backlight partition, or you can gradually increase the maximum backlight volume of the current backlight partition at a constant speed. The duty cycle of the backlight, wherein the increasing speed can be determined by increasing the preset number of frames by the preset amplitude.

In the backlight control method in this embodiment, after the lamp tube is cooled down, by increasing the maximum backlight duty cycle of the current backlight partition, the maximum allowable brightness of the lamp tube can be increased imperceptibly, so that the lamp tube can meet the screen design according to a specific standard. And the maximum brightness produced, not only to protect the lamp from overheating and burning, but also to try to achieve the maximum display brightness of the display.

In one embodiment, step 206 includes: determining the corresponding current display window ratio according to the current display image of the display screen; determining the corresponding configuration value for the maximum backlight duty ratio of each backlight partition of the display screen based on the current display window ratio .

The proportion of the current display window is determined according to the brightness of the current display screen. The target backlight partition corresponding to the display area exceeding the preset brightness threshold can be counted. According to the proportion of the target backlight partition to all backlight partitions, the current display window proportion and brightness can be obtained. The larger the area exceeding the preset brightness threshold, the larger the proportion of the corresponding current display window.

Specifically, when the current proportions of the display windows are different, different configuration values are determined for the maximum backlight duty ratios of each backlight partition of the display screen. The maximum backlight duty cycle determines the maximum brightness that the backlight partition can display. In one embodiment, when the current display window ratio is less than the second preset window threshold, a higher maximum backlight duty cycle can be set, such as the maximum The backlight duty cycle is 100%. When the current display window ratio is between the second preset window threshold and the first preset window threshold, as the window continues to increase, the maximum backlight duty cycle corresponding to the backlight partition continues to decrease until the window ratio is greater than the first At a preset window threshold, the maximum backlight duty cycle corresponding to the backlight partition remains unchanged. As the window continues to increase, it means that the number of lamps in the display screen whose brightness exceeds the preset brightness threshold increases, and the heat generated by the lamps increases. At this time, it is necessary to reduce the maximum backlight duty cycle corresponding to the backlight partition, so as to reduce the heat of the lamps and protect the light tube.

The backlight control method in this embodiment can determine the corresponding configuration value for the maximum backlight duty cycle of each backlight partition of the display screen according to the current proportion of the display window, so as to achieve dynamic configuration, the configuration is flexible and conforms to the characteristics of the human eye, and the lamp can be adjusted flexibly. tube for protection.

In one of the embodiments, the backlight control method further includes: when the display brightness change corresponding to a preset proportion of the backlight partitions in the display screen exceeds a brightness change threshold, determining that the display screen is switched between scenes.

Specifically, the statistics of the display brightness changes corresponding to the preset proportions of the backlight partitions in the display screen can be obtained through the grayscale histogram algorithm. When the display brightness changes corresponding to the preset proportions of the backlight partitions in the display screen exceed the brightness change threshold, such as When more than 10% of the lamps have more than one grayscale change, it is determined that the display screen has switched scenes.

In the backlight control method in this embodiment, it is efficient and convenient to determine that the display screen is switched between scenes by determining that the display brightness change corresponding to the backlight partition of the preset ratio exceeds the brightness change threshold.

In one of the specific embodiments, as shown in FIG. 4 and FIG. 5 , it is a schematic flowchart of a backlight control method in one embodiment. The display screen includes 210 backlight partitions, and each backlight partition includes 2 lamps. When the duty of a single lamp exceeds 60% and the time exceeds 5 minutes, there is a risk of burning out the lamp. The lamps are processed separately through 2 layers of logic. Protection, the specific process is as follows:

1. As shown in Figure 4, the first layer of logic is based on a single backlight partition, and each backlight partition has 3 parameters, namely:

a. After processing by the 40% power allocation algorithm, the duty value input to the current backlight partition, as shown in Figure 6, is the maximum duty value allocation table corresponding to the current backlight partition when the 40% power allocation algorithm occupies different display windows. The maximum duty value corresponding to the current backlight partition determines the actual duty value of each backlight partition.

b. Duration of the lamp exceeding 60% duty value

c. The maximum duty value allowed by the lamp

According to the conditions of parameters a and b, the value of parameter c is determined in real time to adjust the brightness of the lamp tube; the first timer counts the duration of the backlight duty cycle corresponding to the current backlight partition exceeding 60% duty, when the duration exceeds 40 seconds, then slowly reduce the maximum duty value allowed by the lamps of the current backlight partition, which can protect the actual duty of the lamps not to exceed the duty range specified by the hardware. In this embodiment, the duty range is required to be 60%. When the duty cycle of the backlight corresponding to the current backlight partition does not exceed 60% duty for a period of time, the timing trigger function of parameter b will be restored, and the maximum duty allowed by parameter c will also be restored to the initial value, or to the corresponding value according to the current display state of the display. configuration value.

When more than 10% of the lamps have more than one grayscale change, that is, when the screen has a large scene switching, the parameters a, b, and c are reset, the first timer is cleared, and the maximum value of each backlight partition of the display screen is reset. The duty cycle of the backlight is restored to the configuration value corresponding to the current display state of the display screen, and the brightness is immediately reset to the maximum after the scene switching to ensure the display image quality after the scene switching.

2. As shown in Figure 5, the second layer of logic is based on a single backlight partition, and each backlight partition has 3 parameters, namely:

a. After the first layer of logic processing of the front lamp protection, the duty value input to the current backlight partition

b. Duration of the lamp exceeding 60% duty value

c. The maximum duty value allowed by the lamp

The second timer is used to count the duration of the backlight duty cycle corresponding to the current backlight partition exceeding 60% duty. The second timer does not need to be reset when the screen is switched to a larger scene. When the duration exceeds 5 minutes (that is, 300 seconds) ), slowly reduce the maximum duty value that the lamps of the current backlight partition can achieve until the actual duty of the lamps does not exceed 60% duty. When the duty cycle of the backlight corresponding to the current backlight partition does not exceed 60% duty for a period of time, the lamp has dissipated heat, the timing trigger function of parameter b will be restored, and the maximum duty allowed by parameter c will also return to the initial value, or according to the current display on the display The state returns to the corresponding configuration value, and the display brightness increases. When the second timer counts the backlight duty cycle corresponding to the current backlight partition exceeding 60% duty for more than 5 minutes, it is also possible to reset each parameter, and then return to continue to count the backlight duty cycle corresponding to the current backlight partition exceeding 60% duty. In the step of 60% duty duration, if the second timer counts the duration of the backlight duty cycle corresponding to the current backlight partition exceeding 60% duty for less than 5 minutes, the logic part of the first layer can be entered.

In this embodiment, the two-layer logic can automatically reduce the maximum backlight duty cycle of the current backlight partition when the backlight duty cycle is continuously greater than the preset maximum threshold, which will imperceptibly reduce the maximum allowable display brightness, so as to reach the light The purpose of cooling the tube is to prolong the life of the lamp. When the scene is switched, the display of the screen will not be affected by the previous adjustment of the maximum backlight duty cycle of the current backlight partition, so as to ensure the display quality of the screen when the scene is switched, and wait for the lamp to cool down. After that, the maximum allowable brightness will be increased indiscernibly, so that the lamp tube can reach the maximum brightness of the screen designed and manufactured according to a specific standard, protect the lamp tube from overheating and burn out, and try to achieve the purpose of the maximum display brightness of the screen. There is no need to add additional heat dissipation devices, a balance between display quality and heat dissipation is achieved, and display quality is guaranteed while controlling costs.

It should be understood that although the steps in the flowcharts of FIGS. 2-5 are shown in sequence according to the arrows, these steps are not necessarily executed in the sequence shown by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order, and these steps may be performed in other orders. Moreover, at least a part of the steps in FIGS. 2-5 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed and completed at the same time, but may be executed at different times. These sub-steps or stages are not necessarily completed at the same time. The order of execution of the steps is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a part of sub-steps or stages of other steps.

FIG. 7 is a structural block diagram of a backlight control apparatus according to one embodiment. As shown in FIG. 7, a backlight control device includes an acquisition module 402, a reduction module 404, and a recovery module 406, wherein:

The obtaining module 402 is configured to obtain the first duration of time when the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold, and the current backlight partition is the backlight partition in the display screen.

A reducing module 404 is configured to reduce the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold when the first duration is greater than the first time threshold.

The restoration module 406 is configured to restore the maximum backlight duty cycle of each backlight partition of the display screen to a configuration value corresponding to the current display state of the display screen when a scene switching of the display screen is detected.

The backlight control device in this embodiment obtains the first duration of time when the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold; when the first duration is greater than the first time threshold, decreases according to the preset maximum threshold The maximum backlight duty cycle of the current backlight partition; when the screen scene switching is detected, the maximum backlight duty cycle of each backlight partition of the display screen is restored to the configuration value corresponding to the current display state of the display screen. In this way, when the backlight duty cycle is continuously greater than the preset maximum threshold, the maximum backlight duty cycle of the current backlight partition can be automatically reduced, thereby reducing the brightness, reducing the temperature of the lamp tube, and prolonging the life of the lamp tube. The display of the picture is not affected by the previous adjustment of the maximum backlight duty cycle of the current backlight partition, which ensures the display quality of the picture when the scene is switched. There is no need to add additional heat dissipation devices, and the balance between display quality and heat dissipation is achieved. Cost control Guaranteed display quality.

In one embodiment, the acquiring module 402 is further configured to count the first duration by using the first timer corresponding to the current backlight partition.

The device also includes:

The clearing module 408 is configured to clear the first timer when the maximum backlight duty cycle of the current backlight partition is reduced according to the preset maximum threshold, and clear the first timer when the display screen scene is switched.

The backlight control device in this embodiment, when starting to adjust the maximum backlight duty ratio of the current backlight partition or switching the display screen scene, clears the first timer, so that the first timer can work normally and the timing is accurate. When conditions are met, it is automatically cleared and intelligently counts the time.

In one embodiment, the apparatus further includes:

The adjustment module 410 is configured to count the second duration time of the backlight duty cycle corresponding to the current backlight partition that is greater than the preset maximum threshold through the second timer corresponding to the current backlight partition, and when the second duration is greater than the second time threshold, according to The preset maximum threshold reduces the maximum backlight duty cycle of the current backlight partition, clears the second timer, and the second time threshold is greater than the first time threshold.

The backlight control device in this embodiment, through the auxiliary function of the second timer, can also pass the time when the display screen keeps switching scenes and the first timer is cleared and the duration of the backlight duty cycle greater than the preset maximum threshold cannot be counted. The second timer performs statistics, so that when the second time threshold is reached, the maximum backlight duty cycle of the current backlight partition is automatically reduced, so as to protect the lamp tube and prolong the life of the lamp tube.

In one embodiment, the reducing module 404 or the adjusting module 410 is further configured to gradually reduce the corresponding maximum backlight duty cycle for the current backlight partition according to the display image frame period, until the maximum backlight duty cycle of the current backlight partition is equal to or less than Preset maximum threshold.

The backlight control device in this embodiment can gradually reduce the heat of the lamp tube by steadily reducing the maximum backlight duty cycle of the current backlight partition during each display image frame period, and at the same time, the brightness of the displayed image will not change abruptly. Balance with heat dissipation, prolong lamp life, and ensure display quality while controlling costs.

In one embodiment, the apparatus further includes:

The increasing module 412 is used to obtain the third duration time when the backlight duty cycle corresponding to the current backlight partition is smaller than the preset maximum threshold, and when the third duration is greater than the third time threshold, increase the maximum backlight duty cycle of the current backlight partition Compare.

The backlight control device in this embodiment increases the maximum backlight duty cycle of the current backlight partition after the lamp is cooled, so that the maximum allowable brightness of the lamp is imperceptibly increased, so that the lamp can meet the screen design according to a specific standard. And the maximum brightness produced, not only protects the lamp from overheating and burns, but also tries to achieve the maximum display brightness of the display.

In one embodiment, the recovery module 406 is further configured to determine the corresponding current display window ratio according to the current display image of the display screen, and determine the corresponding current display window ratio for the maximum backlight duty ratio of each backlight partition of the display screen based on the current display window ratio configuration value.

The backlight control device in this embodiment can determine the corresponding configuration value for the maximum backlight duty cycle of each backlight partition of the display screen according to the current display window ratio, so as to achieve dynamic configuration, the configuration is flexible and conforms to the characteristics of the human eye, and it can adjust the light tube for protection.

In one embodiment, the apparatus further includes:

The determining module 414 is configured to determine that the display screen is switched between scenes when the display brightness change corresponding to the preset proportion of the backlight partitions in the display screen exceeds the brightness change threshold.

The backlight control device in this embodiment determines that the display screen is switched between scenes by determining that the display screen is switched between scenes according to the change of the display brightness corresponding to the backlight partition of the preset ratio exceeding the brightness change threshold, which is efficient and convenient.

The division of each module in the above backlight control device is only used for illustration. In other embodiments, the backlight control device can be divided into different modules as required to complete all or part of the functions of the above backlight control device.

For specific limitations on the backlight control device, reference may be made to the limitations on the backlight control method above, which will not be repeated here. Each module in the above-mentioned backlight control device can be implemented in whole or in part by software, hardware and combinations thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

FIG. 8 is a schematic diagram of the internal structure of an electronic device in one embodiment. As shown in FIG. 8, the electronic device includes a processor and a memory connected by a system bus. Among them, the processor is used to provide computing and control capabilities to support the operation of the entire electronic device. The memory may include non-volatile storage media and internal memory. The non-volatile storage medium stores an operating system and computer-readable instructions. The computer-readable instructions can be executed by the processor to implement a backlight control method provided by the following embodiments. Internal memory provides a cached execution environment for operating system computer-readable instructions in a non-volatile storage medium. The electronic device can be a mobile phone, a TV, a tablet computer, a PDA (Personal Digital Assistant, personal digital assistant), a POS (Point of Sales, a sales terminal), a vehicle computer, a wearable device, and other electronic devices that include a display screen.

The implementation of each module in the backlight control apparatus provided in the embodiments of the present application may be in the form of computer-readable instructions. The computer readable instructions can be executed on a terminal or server. The program modules constituted by the computer readable instructions may be stored on the memory of the electronic device. When the computer-readable instructions are executed by the processor, the steps of the methods described in the embodiments of the present application are implemented.

In the embodiments of the present application, when one or more processors included in the electronic device execute the computer-readable instructions stored in the memory, the backlight control methods in the foregoing embodiments are implemented.

Embodiments of the present application also provide a computer-readable storage medium. One or more non-volatile computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the backlighting of the various embodiments described above Control Method.

A computer program product containing instructions, when executed on a computer, causes the computer to perform the backlight control method of the various embodiments described above.

Any reference to a memory, storage, database, or other medium as used herein may include non-volatile and/or volatile memory. Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Memory Bus (Rambus) Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM).

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims

A backlight control method, executed by an electronic device, the method comprising:

obtaining a first duration of time in which the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold, where the current backlight partition is the backlight partition in the display screen;

When the first duration is greater than a first time threshold, reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold; and

When it is detected that the display screen scene is switched, the maximum backlight duty cycle of each backlight partition of the display screen is restored to the configuration value corresponding to the current display state of the display screen.
The method according to claim 1, wherein the obtaining the first duration of the backlight duty cycle corresponding to the current backlight partition is greater than a preset maximum threshold, comprising:

The first duration is counted by the first timer corresponding to the current backlight partition;

The method also includes:

when the maximum backlight duty cycle of the current backlight partition is decreased according to the preset maximum threshold, clearing the first timer; and

When the display screen scene is switched, the first timer is cleared.
The method of claim 2, wherein the method further comprises:

Using the second timer corresponding to the current backlight partition to count the second duration of time when the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold; and

When the second duration is greater than the second time threshold, the maximum backlight duty cycle of the current backlight partition is reduced according to the preset maximum threshold, the second timer is cleared, and the second time The threshold is greater than the first time threshold.
The method according to any one of claims 1 to 3, wherein the reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold value comprises:

For the current backlight partition, the corresponding maximum backlight duty cycle is gradually decreased according to the display image frame period until the maximum backlight duty cycle of the current backlight partition is equal to or less than the preset maximum threshold.
The method according to any one of claims 1 to 3, wherein after the reducing the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold value, the method further comprises:

obtaining a third duration for which the backlight duty cycle corresponding to the current backlight partition is less than the preset maximum threshold; and

When the third duration is greater than a third time threshold, the maximum backlight duty cycle of the current backlight partition is increased.
The method according to claim 1, wherein the restoring the maximum backlight duty cycle of each backlight partition of the display screen to a configuration value corresponding to the current display state of the display screen comprises:

Determine the corresponding current display window proportion according to the current display screen of the display screen; and

A corresponding configuration value is determined for the maximum backlight duty cycle of each backlight partition of the display screen based on the current display window ratio.
The method of claim 1, wherein the method further comprises:

When the change of the display brightness corresponding to the preset proportion of the backlight partitions in the display screen exceeds the brightness change threshold, it is determined that the display screen has undergone scene switching.
A backlight control device, comprising:

an obtaining module, configured to obtain a first duration of time when the duty cycle of the backlight corresponding to the current backlight partition is greater than the preset maximum threshold, and the current backlight partition is the backlight partition in the display screen;

a reducing module, configured to reduce the maximum backlight duty cycle of the current backlight partition according to the preset maximum threshold when the first duration is greater than a first time threshold; and

The restoration module is used to restore the maximum backlight duty cycle of each backlight partition of the display screen to a configuration value corresponding to the current display state of the display screen when the scene switching of the display screen is detected.
The apparatus according to claim 8, wherein the obtaining module is further configured to count the first duration by using a first timer corresponding to the current backlight partition, and the apparatus further comprises:

A zero clearing module is used to clear the first timer when the maximum backlight duty cycle of the current backlight partition is reduced according to the preset maximum threshold, and when the display screen scene is switched, all The first timer is cleared.
The apparatus of claim 9, wherein the apparatus further comprises:

The adjustment module is used to count the second duration time of the backlight duty cycle corresponding to the current backlight partition that is greater than the preset maximum threshold through the second timer corresponding to the current backlight partition, and when the second duration is greater than the second time threshold, The maximum backlight duty cycle of the current backlight partition is reduced according to the preset maximum threshold, and the second timer is cleared, and the second time threshold is greater than the first time threshold.
The device according to any one of claims 8 to 10, wherein the reducing module or the adjusting module is further configured to gradually reduce the corresponding maximum backlight duty cycle according to the display image frame period for the current backlight partition until the current backlight The maximum backlight duty cycle of the partition is equal to or less than the preset maximum threshold.
The apparatus according to any one of claims 8 to 10, wherein the apparatus further comprises:

The increasing module is used to obtain a third duration of time when the duty cycle of the backlight corresponding to the current backlight partition is less than a preset maximum threshold, and when the third duration is greater than the third time threshold, increase the maximum duration of the current backlight partition. Backlight duty cycle.
The device according to claim 8, wherein the recovery module is further configured to determine the corresponding current display window ratio according to the current display screen of the display screen, and based on the current display window ratio, each backlight partition of the display screen is The maximum backlight duty cycle determines the corresponding configuration value.
The apparatus of claim 8, wherein the apparatus further comprises:

The judgment module is used for judging that scene switching occurs on the display screen when the display brightness change corresponding to the preset proportion of the backlight partitions in the display screen exceeds the brightness change threshold.
An electronic device comprising a memory and one or more processors, the memory having computer-readable instructions stored therein, wherein the computer-readable instructions, when executed by the one or more processors, cause the one or more processors to perform the steps of the method of any of claims 1 to 7.
One or more computer-readable storage media storing computer-readable instructions which, when executed by one or more processors, cause the steps of the method of any one of claims 1 to 7 to be implemented.