CN113129841A - Partitioned backlight control method, terminal and storage medium - Google Patents
Partitioned backlight control method, terminal and storage medium Download PDFInfo
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- CN113129841A CN113129841A CN201911403438.3A CN201911403438A CN113129841A CN 113129841 A CN113129841 A CN 113129841A CN 201911403438 A CN201911403438 A CN 201911403438A CN 113129841 A CN113129841 A CN 113129841A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention discloses a partition backlight control method, a terminal and a storage medium, wherein the partition backlight control method comprises the following steps: detecting current values of the partitions of the backlight; judging whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first time period; and when the sum of the currents exceeds a preset threshold value, reducing the currents of the subareas to a preset safe threshold current in a second subsequent time period. According to the invention, the target current of the partition in the subsequent second time duration is determined according to the current sum of the backlight partition in the first time duration, so that the luminance of the screen backlight is controlled, the actual luminance of the backlight can be timely adjusted when the backlight temperature rise is too high, the safety risk caused by overheating of the backlight is prevented, and the safety of the screen backlight is improved.
Description
Technical Field
The present invention relates to the field of backlight technologies, and in particular, to a method, a terminal, and a storage medium for controlling a partitioned backlight.
Background
Local Dimming (Local Dimming) refers to a technology that the backlight of a display screen can be adjusted in a partition mode, and when screen display is achieved through the technology, the contrast of a display picture can be improved. However, when a high-contrast high-definition picture is viewed for a long time, a partial backlight area can keep high brightness for a long time and continuously raise the temperature, so that the partial backlight area is overheated, and potential safety hazards exist.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The present invention provides a partitioned backlight control method, a terminal and a storage medium, aiming at solving the problem that when a Local Dimming technology is used for screen display in the prior art, a part of the backlight area is overheated.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method of zoned backlight control, wherein the method comprises:
detecting current values of the partitions of the backlight;
judging whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first time period;
and when the sum of the currents exceeds a preset threshold value, reducing the currents of the subareas to a preset safe threshold current in a second subsequent time period.
The method for controlling the partitioned backlight, wherein the detecting the current value of each partition of the backlight specifically comprises:
acquiring each frame output by an image processor;
and acquiring the current value backlight of each subarea according to the brightness information of each frame.
The method for controlling the partitioned backlight, wherein the determining whether the sum of the currents of the partitioned areas exceeds a preset threshold value within a preset first time period specifically includes:
acquiring a first current sum corresponding to all frames of the partition in the first duration;
and judging whether the first current sum exceeds a preset first threshold value.
The method for controlling the partitioned backlight, wherein the determining whether the sum of the currents of the partitioned areas exceeds a preset threshold value within a preset first time period specifically includes:
respectively acquiring a first current sum corresponding to all frames of each partition in the N adjacent partitions in the first duration;
and acquiring a second current sum of the N adjacent subareas, wherein N is a positive integer, and the second current sum is the sum of the first current sums respectively corresponding to each of the N adjacent subareas.
The method for controlling the zoned backlight comprises the step of reducing the currents of the adjacent N zones to the preset safe threshold current simultaneously within a second subsequent time period when the sum of the second currents exceeds the second threshold value.
The method for controlling the partitioned backlight, wherein the step of reducing the current of the partitioned backlight to the preset safe threshold current in the subsequent second time period specifically includes:
and reducing the current of the subarea according to a preset step value, so that the current of the subarea is reduced to the safe threshold current in the second time period.
The method for controlling the partitioned backlight, wherein the reducing the current of the partition according to the preset step value specifically includes:
setting target current corresponding to each frame of the subarea in the second time length according to a preset step value;
and adjusting the actual current of the subarea according to the target current.
The method for controlling the partitioned backlight, wherein the adjusting the actual current of the partition according to the target current specifically includes:
and inputting the target current corresponding to each frame of the subarea to a driving control chip corresponding to the subarea, so that the driving control chip adjusts the actual current backlight of the subarea according to the target current.
A terminal, wherein the terminal comprises: the system comprises a processor and a storage medium which is in communication connection with the processor, wherein the storage medium is suitable for storing a plurality of instructions, and the processor is suitable for calling the instructions in the storage medium to execute the steps of realizing the partition backlight control method.
A storage medium, wherein the storage medium stores one or more programs, which are executable by one or more processors to implement the steps of any of the above-described partitioned backlight control methods.
Has the advantages that: compared with the prior art, the invention provides a partition backlight control method, a terminal and a storage medium, wherein the partition backlight control method determines the target current of a partition in a subsequent second time length according to the current sum of the backlight partition in the first time length so as to control the luminance of the screen backlight, and can adjust the actual luminance of the backlight in time when the backlight temperature rise is too high, thereby preventing the safety risk of the backlight caused by overheating and improving the safety of the screen backlight.
Drawings
Fig. 1 is a flowchart of a first embodiment of a method for controlling a partitioned backlight according to the present invention;
FIG. 2 is a schematic diagram illustrating brightness control of each sub-area in the sub-area backlight control method according to the present invention;
fig. 3 is a schematic structural diagram of a terminal provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The partition backlight control method provided by the invention can be applied to a terminal. The terminal may be, but is not limited to, various personal computers, notebook computers, mobile phones, tablet computers, vehicle-mounted computers, and portable wearable devices. The terminal of the invention adopts a multi-core processor. The processor of the terminal may be at least one of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Video Processing Unit (VPU), and the like.
Example one
Referring to fig. 1, fig. 1 is a flowchart illustrating a partition backlight control method according to a first embodiment of the present invention. The method comprises the following steps:
s100, detecting the current value of each partition of the backlight.
Specifically, the screen backlight is correspondingly adjusted in brightness according to brightness data of an image displayed by the screen, and the brightness adjustment of the backlight is controlled by current, that is, the current of the screen backlight reflects the brightness of the screen backlight, and the brighter the screen backlight, the more heat is generated. In this embodiment, the current value of each partition of the detected backlight may reflect the brightness of the screen backlight, so as to reflect the heating degree of the screen backlight.
In this embodiment, the screen is displayed by Local Dimming (Local Dimming) technology, that is, the backlight of the screen includes at least one partition, and the driving processor adjusts the brightness of each partition separately. The detecting the current value of each partition of the backlight specifically includes:
s110, acquiring each frame output by the image processor;
and S120, acquiring the current value of each subarea according to the brightness information of each frame.
When the screen displays the image, the image is displayed by taking a frame as a unit, specifically, the image processor processes the image data and outputs a frame of image, and the screen receives and displays the frame of image. For a frame of image, the brightness corresponding to different regions is different, so when the image information corresponding to each frame output by the image processor is obtained, the brightness of each partition of the screen backlight corresponds to different brightness, while as described above, the brightness adjustment of the screen backlight is implemented by current adjustment, so in order to implement that the screen can accurately display each frame according to the image information, it is necessary to obtain the current value of each partition in the corresponding frame according to the image information corresponding to each frame.
Specifically, after the image processor outputs each frame, before the screen displays the corresponding frame, it is necessary to determine how each partition of the backlight should be displayed according to the image information of the frame, for example, determine the color of each partition of the backlight according to the color information in the image information of the frame, determine the brightness of each partition of the backlight according to the brightness information in the image information of the frame, and so on. And the brightness of each subarea of the backlight is directly related to the current of each subarea of the backlight, so that the current value respectively corresponding to each subarea in each frame can be obtained according to the brightness information respectively corresponding to each frame. It is obvious that the current value is a theoretical value obtained from the image information, and when the temperature of a partition is normal, the actual current value of the partition may be set as the theoretical value in order to obtain a better display effect, but if the partition is continuously heated and the theoretical value of the partition corresponding to the current frame is kept at a higher level, the actual current value of the screen backlight is set as the theoretical value, which obviously increases the heating degree of the partition, so that the temperature of the partition is continuously increased, and the backlight of the partition is damaged or even burned. Therefore, in the method for controlling the partitioned backlight provided by the present invention, the actual current of each partition in the current frame is controlled according to the current value of each partition within the preset time duration.
In a possible implementation manner, when obtaining the current value, the current value may be obtained by combining brightness settings of a screen, specifically, since different users have different senses and requirements for brightness, during a screen use process, a user may set the overall brightness of the screen, for example, to 80%, 60%, and the like of a standard brightness, and at this time, when obtaining the current value corresponding to each partition in each frame according to image information corresponding to each frame, the current value needs to be determined by combining the brightness settings of the screen in addition to determining the current value according to brightness information in the image information. For example, the luminance information of a certain partition in the image information is 2, and the luminance of the screen is set to 80% of the standard luminance, then the theoretical luminance value that the partition needs to display is 2 x 80% — 1.6, and the current value corresponding to the partition is obtained according to the luminance information of 1.6.
Specifically, the method further includes, after the detecting the current value of each segment of the backlight, the steps of:
s200, judging whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first time period.
The sum of the currents of the subareas in the preset first time period reflects the heating condition of the subareas in the first time period. The first time period may be determined by the heat-resistant performance of the backlight, such as 200s, 300s, and the like. In this embodiment, in order to better reflect the current temperature accumulated increase condition of the partition, that is, the temperature increase degree, when it is determined whether the current sum of the partition exceeds a preset threshold value within a preset first time period, the current sum of the partition within the first time period before a current frame is obtained, where the current frame is a frame that is already output by the image processor but is not yet displayed on the screen. That is to say, when the image information of the current frame output by the image processor is acquired and the current value corresponding to the partition in the current frame is acquired according to the image information, the partition is not immediately adjusted according to the current value, but the current sum corresponding to all frames of the partition in the first duration before the current frame is acquired first.
In a possible implementation manner, each partition in the backlight is separately determined, and when a sum of currents of one partition in the first time period exceeds a preset threshold, the currents of the partition are adjusted, specifically, determining whether the sum of currents of the partitions exceeds the preset threshold in the preset first time period includes:
s210, acquiring a first current sum corresponding to all frames of the partition in the first duration.
As will be apparent from the foregoing description, for each partition, there is one current value corresponding to each frame, and a first current sum corresponding to the partition in the first duration is a sum of the current values corresponding to all frames of the partition in the first duration, where the partition has a plurality of current values. For example, the frequency of the image information of the frame output by the image processor is 50Hz, the first preset time duration is 300s, then 50 frames are obtained per second, 15000 frames exist in the first preset time duration, then each of the partitions corresponds to 15000 current values in the first preset time duration, and the sum of the 15000 current values corresponding to the partitions is obtained as the first current sum.
S220, judging whether the first current sum exceeds a preset first threshold value.
And after the first current sum corresponding to the partition is obtained, judging whether the first current sum exceeds a preset first threshold value. And when the sum of the first currents exceeds a preset first threshold value, reducing the currents of the subareas within a second subsequent preset time period so as to prevent the subarea temperature rise from being too high.
The first threshold may be obtained according to the heat resistance of the backlight, and in a possible implementation manner, the first threshold may be obtained through temperature rise experimental data of the backlight, and different manufacturers have different temperature rise experimental standards, for example, the backlight temperature rise in 3 minutes cannot exceed 80 ℃, the first threshold is correspondingly obtained according to 80 ℃, or the backlight temperature rise in 2 minutes cannot exceed 70 ℃, the first threshold is correspondingly obtained according to 70 ℃, and the like. Moreover, the first threshold may be different for different backlight models, and the present invention is not limited to this specifically.
Since the number of partitions is often large on the backlight of one screen, and comparing the first current sum with the first threshold value for each partition respectively brings a large calculation amount, in another possible implementation manner, the adjacent N partitions are analyzed as a whole, so that the operation process is simplified, and the backlight control method for the backlight partitions provided by the invention has higher efficiency. Specifically, in this implementation manner, the determining whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first time period specifically includes:
s230, acquiring a first current sum corresponding to all frames of each partition in the N adjacent partitions in the first time length;
s240, acquiring a second current sum of the adjacent N subareas, wherein N is a positive integer, and the second current sum is the sum of the first current sums respectively corresponding to each of the adjacent N subareas.
When analyzing the adjacent N partitions as a whole, the current sum of the adjacent N partitions is obtained. Specifically, a first current sum corresponding to all frames of each of the N adjacent partitions in the first time period is obtained, and as described above, the first current sum corresponding to all frames of each of the N adjacent partitions in the first time period is a sum of the current values corresponding to all frames of the partition in the first time period. After the first current sums respectively corresponding to each of the N partitions are obtained, the N first current sums are added to obtain current sums corresponding to the adjacent N partitions as a whole (for convenience of distinction, referred to as second current sums). The sum of the second currents corresponding to all the N partitions in the current frame can better reflect the temperature accumulated rise of the N partitions in front of the current frame.
And S250, judging whether the sum of the second currents exceeds a preset second threshold value.
After the second current sum is obtained, the second current sum is compared with a preset second threshold, similarly, the second threshold may also be obtained according to the heat resistance of the backlight, the second threshold may be N times of the temperature rise threshold of a single partition, and the temperature rise literature value of a single partition may be obtained as in the foregoing method for obtaining the first threshold. Referring to fig. 1 again, the method for controlling backlight partition provided in the first embodiment further includes the steps of:
s300, when the sum of the currents exceeds a preset threshold value, reducing the currents of the subareas to a preset safe threshold current in a second period of time.
When judging whether the sum of the currents exceeds a preset threshold value or not for a single subarea, reducing the current of the single subarea to a preset safe threshold current in a subsequent second time period; and when judging whether the sum of the currents exceeds a preset threshold value by taking the adjacent N subareas as a whole, reducing the currents of the adjacent N subareas to the preset safe threshold value current at the same time in a subsequent second time period.
The reducing the current of the partition to the preset safe threshold current is reducing the current of the partition according to a preset step value, so that the current of the partition is reduced to the safe threshold current within the second time period, and the reducing the current of the partition according to the preset step value specifically includes:
and S310, setting the target current corresponding to each frame of the partition in the second time length according to a preset step value.
The target current is the current that the partition needs to achieve, that is, after the target current is obtained, the actual current of the partition is adjusted according to the target current, and the actual current of the partition of the physician is consistent with the target current.
Specifically, when the sum of the currents of the partitions in the first duration does not exceed a preset threshold, it is indicated that the luminance data of the partitions in the frame displayed in the first duration before the current frame does not exceed the temperature rise standard of the partitions, that is, the temperature rise condition of the partitions is safe, and then, when the current frame is displayed, the current value corresponding to the partition in the current frame may be set as the target current, that is, the partitions may emit light according to the luminance data of the current frame, so as to achieve a better display effect.
When the sum of the currents of the partitions in the first time period exceeds a preset threshold value, it is indicated that the luminance data of the partitions in the frame displayed in the first time period before the current frame exceeds the temperature rise standard of the prime partition, that is, the temperature of the backlight of the partitions may continuously rise, and there is a risk of too high temperature rise.
Specifically, the safe threshold current is a preset value, and may be specifically set according to the heat resistance of the screen backlight, in a possible implementation manner, the safe threshold current may be a maximum current that can be allowed to be reached by a single LED lamp bead, and may be 200mA, 250mA, and the like, at least one LED lamp bead connected in series is respectively present in each of the partitions, and the safe threshold current of the partition may be the number of LED lamp beads in the partition plus 80% or 70% of the maximum current, and the like.
As already explained above, the current of the partition is directly related to the brightness, and therefore, in this embodiment, in order to prevent the brightness of the partition from suddenly decreasing and causing a problem of poor experience of a viewer, when it is determined that the sum of the currents of the partitions exceeds a preset threshold, the target current of the partition is not immediately set as the safe threshold current, but the target current corresponding to each frame of the partition in the second duration is set according to a preset step value, so as to achieve that the target current of the partition slowly reaches the safe threshold current in the second duration after the current frame. Specifically, the step value may be an adjustment amount of the target current in each frame in the second time period, and the step value may be a fixed value, for example, 1mA, 3mA, or the like, or the step value may be obtained by first obtaining the current value corresponding to the partition in the current frame, calculating a difference between the current value and the safety threshold current, and obtaining the step value according to the difference and the second time period, where the second time period may be 60s, 80s, or the like. For example, the safety threshold current is 160mA, the sum of the currents corresponding to the partitions in the current frame is 190mA, the second preset time period is 60s, the frequency of the image processor outputting frames is 50Hz, and there are 300 frames in the second time period, then the step value may be set to 0.1mA, the target current corresponding to the partition in the current frame is set to 189.9mA, and the target current corresponding to the next frame is set to 189.8mA, until after the second preset time period, the target current of the partition is 160mA, so that the temperature rise of the backlight of the partition can be reduced, and the brightness of the partition can be prevented from changing suddenly to affect the viewing experience of the screen. Of course, the above is only an example, and there may be other implementation manners for setting the target current as the safe threshold current, and those skilled in the art can fully conceive other schemes for setting the target current as the safe threshold current through the above description, for example, setting the step value as an adjustment amount of the target current every ten frames in the second duration, that is, adjusting the target current once every ten frames, so that the target current reaches the safe threshold current after the second duration, and so on.
After the target current corresponding to each frame of the partition in the second time period is set according to a preset step value, the method further includes:
and S320, adjusting the actual current of the subarea according to the target current.
As shown in fig. 2, the brightness of the screen backlight is controlled by a driving control chip, each partition corresponds to a driving control chip, each driving control chip controls the brightness of at least one partition, and the adjusting the actual current of the partition according to the target current specifically includes:
and inputting the target current corresponding to each frame of the subarea to a driving control chip corresponding to the subarea, so that the driving control chip adjusts the actual current of the subarea according to the target current.
After the target current corresponding to each frame of the partition is obtained, the target current is input to a current register in the driving control chip corresponding to the partition, and the current register controls the actual current of the partition according to the target current corresponding to each frame of the partition, so that the brightness of each partition is controlled.
It should be noted that, when the sum of currents does not exceed a preset threshold, after the current value corresponding to the current frame of the partition is taken as the target current, the step of determining whether the sum of currents of the partition exceeds a preset threshold within a preset first time period is continuously performed, and when the sum of currents exceeds a preset threshold, the step of determining whether the sum of currents of the partition exceeds a preset threshold within a preset first time period is not performed until the target current reaches the safety threshold, that is, when the sum of currents of the partition does not exceed a preset threshold, the step of determining whether the sum of currents of the partition exceeds a preset threshold within a preset first time period is cyclically performed on the partition until the sum of currents of the partition exceeds a preset threshold, and at the moment, after the actual current of the subarea is controlled to the safe threshold current, the step of judging whether the sum of the currents of the subareas exceeds a preset threshold value within a preset first time length is carried out on the subarea.
In summary, in the embodiment, the target current of the partition in the subsequent second time duration is determined according to the sum of the currents of the backlight partitions in the first time duration, so as to control the light emitting brightness of the screen backlight, and the actual brightness of the backlight can be timely adjusted when the backlight temperature rise is too high, thereby preventing the safety risk caused by overheating of the backlight and improving the safety of the screen backlight.
It should be understood that, although the steps in the flowcharts shown in the figures of the present specification are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in the flowchart may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Example two
Based on the above embodiments, the present invention further provides a terminal, and a schematic block diagram thereof may be as shown in fig. 3. The terminal comprises a processor, a memory, a network interface, a display screen and a temperature sensor which are connected through a system bus. Wherein the processor of the terminal is configured to provide computing and control capabilities. The memory of the terminal comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the terminal is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method of partitioned backlight control. The display screen of the terminal can be a liquid crystal display screen or an electronic ink display screen, and the temperature sensor of the terminal is arranged in the terminal in advance and used for detecting the current operating temperature of internal equipment.
It will be understood by those skilled in the art that the block diagram shown in fig. 3 is a block diagram of only a portion of the structure associated with the inventive arrangements and is not intended to limit the terminals to which the inventive arrangements may be applied, and that a particular terminal may include more or less components than those shown, or may have some components combined, or may have a different arrangement of components.
In one embodiment, a terminal is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program implementing at least the following steps:
detecting current values of the partitions of the backlight;
judging whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first time period;
and when the sum of the currents exceeds a preset threshold value, reducing the currents of the subareas to a preset safe threshold current in a second subsequent time period.
The detecting the current value of each partition of the backlight specifically includes:
acquiring each frame output by an image processor;
and acquiring the current value backlight of each subarea according to the brightness information of each frame.
Wherein, the determining whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first duration specifically includes:
acquiring a first current sum corresponding to all frames of the partition in the first duration;
and judging whether the first current sum exceeds a preset first threshold value.
Wherein, the judging whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first duration specifically includes:
respectively acquiring a first current sum corresponding to all frames of each partition in the N adjacent partitions in the first duration;
and acquiring a second current sum of the N adjacent subareas, wherein N is a positive integer, and the second current sum is the sum of the first current sums respectively corresponding to each of the N adjacent subareas.
When the second current sum exceeds the second threshold value, the currents of the adjacent N subareas are simultaneously reduced to a preset safe threshold current in a second subsequent time period.
Wherein, in the subsequent second period, reducing the current of the partition to the preset safe threshold current specifically includes:
and reducing the current of the subarea according to a preset step value, so that the current of the subarea is reduced to the safe threshold current in the second time period.
Wherein reducing the partition current according to a preset step value specifically comprises:
setting target current corresponding to each frame of the subarea in the second time length according to a preset step value;
and adjusting the actual current of the subarea according to the target current.
Wherein the adjusting the actual current of the partition according to the target current specifically includes:
and inputting the target current corresponding to each frame of the subarea to a driving control chip corresponding to the subarea, so that the driving control chip adjusts the actual current of the subarea according to the target current.
EXAMPLE III
The present invention also provides a storage medium storing one or more programs executable by one or more processors to implement the steps of the partitioned backlight control method described in the above embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for zonal backlight control, the method comprising:
detecting current values of the partitions of the backlight;
judging whether the sum of the currents of the partitions exceeds a preset threshold value within a preset first time period;
and when the sum of the currents exceeds a preset threshold value, reducing the currents of the subareas to a preset safe threshold current in a second subsequent time period.
2. The method according to claim 1, wherein the detecting the current value of each segment of the backlight specifically comprises:
acquiring each frame output by an image processor;
and acquiring the current value of each subarea according to the brightness information of each frame.
3. The method according to claim 2, wherein the determining whether the sum of the currents of the sub-areas exceeds a preset threshold value within a preset first time period specifically comprises:
acquiring a first current sum corresponding to all frames of the partition in the first duration;
and judging whether the first current sum exceeds a preset first threshold value.
4. The method according to claim 3, wherein the determining whether the sum of the currents of the sub-areas exceeds a preset threshold value within a preset first time period specifically comprises:
respectively acquiring a first current sum corresponding to all frames of each partition in the N adjacent partitions in the first time length;
acquiring a second current sum of the N adjacent partitions, wherein N is a positive integer, and the second current sum is the sum of the first current sums respectively corresponding to each partition in the N adjacent partitions;
and judging whether the second current sum exceeds a preset second threshold value.
5. The method according to claim 4, wherein when the sum of the second currents exceeds the second threshold, the currents of the adjacent N sub-areas are simultaneously decreased to a preset safe threshold current for a second period of time.
6. The method according to any one of claims 1 to 5, wherein the step of reducing the current of the sub-area to the preset safe threshold current in the subsequent second period specifically comprises:
and reducing the current of the subarea according to a preset step value, so that the current of the subarea is reduced to the safe threshold current in the second time period.
7. The method according to claim 6, wherein the reducing the partition currents by the preset step values specifically comprises:
setting target current corresponding to each frame of the subarea in the second time length according to a preset step value;
and adjusting the actual current of the subarea according to the target current.
8. The method according to claim 7, wherein the adjusting the actual currents of the segments according to the target currents specifically comprises:
and inputting the target current corresponding to each frame of the subarea to a driving control chip corresponding to the subarea, so that the driving control chip adjusts the actual current of the subarea according to the target current.
9. A terminal, characterized in that the terminal comprises: a processor, a storage medium communicatively coupled to the processor, the storage medium adapted to store a plurality of instructions, the processor adapted to invoke the instructions in the storage medium to perform the steps of implementing the backlight partition backlight control method of any of claims 1-8.
10. A storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the steps of the backlight partition backlight control method of any one of claims 1-8.
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