CN108364614B - LED over-temperature protection method, terminal and computer readable storage medium - Google Patents
LED over-temperature protection method, terminal and computer readable storage medium Download PDFInfo
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- CN108364614B CN108364614B CN201810131685.1A CN201810131685A CN108364614B CN 108364614 B CN108364614 B CN 108364614B CN 201810131685 A CN201810131685 A CN 201810131685A CN 108364614 B CN108364614 B CN 108364614B
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- 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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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Abstract
The invention discloses an LED over-temperature protection method, a terminal and a computer readable storage medium, wherein for the terminal using an LED as a backlight source, when image data to be displayed is received and the current of each LED backlight partition is a preset maximum current, whether the current duty ratio of at least one LED backlight partition is higher than a preset current duty ratio is determined, if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, the current duty ratio of at least one LED backlight partition is determined to be higher than the accumulated duration of the preset current duty ratio, if the accumulated duration reaches a preset threshold, the current of the corresponding LED backlight partition is reduced to be safe current, and the current is kept for a period of time, so that the temperature of the corresponding LED backlight partition can be rapidly reduced, and the LED can be prevented from being damaged due to over-high temperature.
Description
Technical Field
The invention relates to the technical field of image display processing, in particular to an LED over-temperature protection method, a terminal and a computer readable storage medium.
Background
With the rapid development of the liquid crystal display technology, the resolution of the liquid crystal display screen is higher and higher, more and more image enhancement technologies can be supported, and the size of the liquid crystal display screen is larger and larger. In the prior art, an LED (light emitting Diode) is widely used as a backlight source in a large-sized liquid crystal display. When the backlight source is driven by the backlight control circuit driving circuit, the LEDs of a plurality of backlight partitions need to be controlled simultaneously, the current of the LED of each backlight partition is accurately controlled by adjusting the current of the driving circuit, and therefore the backlight brightness of the backlight partitions is controlled.
At present, by adopting an HDR (High-Dynamic Range, High Dynamic Range image) technology, an image brightness Range and rich picture colors can be effectively improved, along with the improvement of the image brightness Range, a current Range of an LED is also improved, when the brightness of an image to be displayed is higher, a current required to flow through the LED is also higher, so that the backlight brightness meets the brightness requirement of the image to be displayed, and the higher the current flowing through the LED is, the LED is easy to generate heat, so that the LED is in a higher temperature state, and because a liquid crystal display screen generally needs to work for a long time, the LED is easy to be burnt out due to overheating when the LED is in the higher temperature state for a long time.
Therefore, how to rapidly reduce the temperature of the LED when the temperature of the LED is high to prevent the LED from being damaged due to the high temperature is an urgent problem to be solved at present.
Disclosure of Invention
The invention mainly aims to provide an LED over-temperature protection method, a terminal and a computer readable storage medium, aiming at rapidly reducing the temperature of an LED when the temperature of the LED is higher and preventing the LED from being damaged due to over-high temperature.
In order to achieve the above object, the present invention provides an LED over-temperature protection method, including the steps of:
when image data to be displayed is received, determining whether the current of each LED backlight partition is adjusted to be a preset maximum current or not according to a film source format or a current image display mode of the image data to be displayed;
if the current of each LED backlight partition is adjusted to be the preset maximum current, determining whether the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio;
if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, determining the accumulated duration of the current duty ratio of the at least one LED backlight partition higher than the preset current duty ratio;
and if the accumulated duration reaches a preset threshold, reducing the current of the at least one LED backlight subarea to a preset safe current, and keeping the current of the at least one LED backlight subarea at the preset safe current within the preset duration.
Optionally, the step of determining whether to adjust the current of each LED backlight partition to a preset maximum current according to the slice source format of the image data to be displayed or the current image display mode includes:
judging whether the film source format of the image data to be displayed is a preset format or not, or judging whether the current image display mode is a preset image display mode or not;
and if the format of the image data to be displayed is a preset format or the current image display mode is a preset image display mode, adjusting the current of each LED backlight subarea to be a preset maximum current.
Optionally, the step of determining the accumulated duration of the current duty ratio of the at least one LED backlight partition being higher than the preset current duty ratio comprises:
recording a first continuous duration that the current duty ratio of the at least one LED backlight partition is higher than a preset current duty ratio;
when the fact that the current duty ratio of the at least one LED backlight partition is changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio is detected, recording a second continuous duration that the current duty ratio of the at least one LED backlight partition is lower than or equal to the preset current duty ratio;
and determining the accumulated duration that the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio according to the first continuous duration and the second continuous duration.
Optionally, the step of determining, according to the first continuous duration and the second continuous duration, a cumulative duration that the current duty ratio of the at least one LED backlight partition is higher than a preset current duty ratio includes:
inquiring a mapping relation table between the continuous duration and the back-off coefficient, and determining the back-off coefficient corresponding to the second continuous duration;
and multiplying the back-off coefficient by the second continuous duration to obtain a back-off duration, and subtracting the back-off duration from the first continuous duration to determine the accumulated duration.
Optionally, the step of determining, according to the first continuous duration and the second continuous duration, a cumulative duration that the current duty ratio of the at least one LED backlight partition is higher than a preset current duty ratio further includes:
acquiring a preset back-off coefficient, and multiplying the preset back-off coefficient by the second continuous duration to acquire a back-off duration;
subtracting the back-off duration from the first continuous duration to determine an accumulated duration that the current duty cycle of the at least one LED backlight partition is higher than a preset current duty cycle.
Optionally, the LED over-temperature protection method further includes:
triggering the sleep protection timing when the current duty ratio of at least one LED backlight partition is detected to be higher than the preset current duty ratio;
and when the accumulated time length of the sleep protection timing reaches the preset accumulated time length, reducing the current of each LED backlight subarea into a preset safe current.
Optionally, the LED over-temperature protection method further includes:
calculating the power of each LED backlight partition, and adding the power of each LED backlight partition to obtain the total power of the LEDs;
comparing the total power of the LEDs with a preset power supply power;
and if the total power of the LEDs is higher than the power of a preset power supply, adjusting the current duty ratio of each LED backlight partition.
Optionally, the step of adjusting the current duty ratio of each LED backlight partition includes:
calculating the ratio of the total power of the LEDs to the power of a preset power supply, and acquiring the current duty ratio of each LED backlight partition;
and multiplying the ratio of the total power of the LEDs to the power of a preset power supply by the current duty ratio of each LED backlight partition so as to adjust the current duty ratio of each LED backlight partition.
In addition, in order to achieve the above object, the present invention further provides an LED over-temperature protection terminal, including: the LED over-temperature protection device comprises a memory, a processor and an LED over-temperature protection program which is stored on the memory and can run on the processor, wherein the steps of the LED over-temperature protection method are realized when the LED over-temperature protection program is executed by the processor.
The invention also provides a computer readable storage medium, on which an LED over-temperature protection program is stored, which when executed by a processor implements the steps of the LED over-temperature protection method as described above.
The invention provides an LED over-temperature protection method, a terminal and a computer readable storage medium, for the terminal using an LED as a backlight source, when receiving image data to be displayed and the current of each LED backlight subarea is a preset maximum current, determining whether the current duty ratio of at least one LED backlight subarea is higher than the preset current duty ratio, if the current duty ratio of at least one LED backlight subarea is higher than the preset current duty ratio, determining the accumulated duration time that the current duty ratio of at least one LED backlight subarea is higher than the preset current duty ratio, if the accumulated duration time reaches a preset threshold value, reducing the current corresponding to the LED backlight subarea to a safe current, and keeping for a period of time, because the current of each LED backlight subarea reaches the maximum, the image display effect is effectively enhanced, and meanwhile, the current duty ratio of any LED backlight subarea is higher than a limit value, when the time is continuously limited, the current corresponding to the LED backlight subarea is reduced, the time is kept for a while, the temperature corresponding to the LED backlight subarea can be rapidly reduced, the LED is prevented from being damaged due to overhigh temperature, the service life of the LED is prolonged, and the service life of the LED is prolonged while the image display effect is considered.
Drawings
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a method for protecting an LED from over-temperature according to the present invention;
FIG. 3 is a detailed flowchart of step S103 in the first embodiment of the present invention;
fig. 4 is a schematic flow chart of a second embodiment of the LED over-temperature protection method according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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 main solution of the embodiment of the invention is as follows: when image data to be displayed are received and the current of each LED backlight partition is the preset maximum current, whether the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio is determined, if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, the accumulated duration of the current duty ratio of at least one LED backlight partition is determined, if the accumulated duration reaches the preset threshold, the current corresponding to the LED backlight partition is reduced to be safe current, the current is kept for a period of time, the temperature of the corresponding LED backlight partition is rapidly reduced, the LED is prevented from being damaged due to overhigh temperature, and the service life of the LED is prolonged.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The LED over-temperature protection terminal can be a PC and a television, and can also be a mobile terminal with a display function, such as a smart phone, a tablet computer, an electronic book reader, a portable computer and the like.
As shown in fig. 1, the LED over-temperature protection terminal may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the LED over-temperature protection terminal may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like.
It will be understood by those skilled in the art that the LED overtemperature protection terminal structure shown in fig. 1 does not constitute a limitation of the LED overtemperature protection terminal and may include more or fewer components than illustrated, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an LED over-temperature protection program.
In the LED over-temperature protection terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the LED over-temperature protection program stored in the memory 1005, and perform the following steps:
when image data to be displayed is received, determining whether the current of each LED backlight partition is adjusted to be a preset maximum current or not according to a film source format or a current image display mode of the image data to be displayed;
if the current of each LED backlight partition is adjusted to be the preset maximum current, determining whether the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio;
if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, determining the accumulated duration of the current duty ratio of the at least one LED backlight partition higher than the preset current duty ratio;
and if the accumulated duration reaches a preset threshold, reducing the current of the at least one LED backlight subarea to a preset safe current, and keeping the current of the at least one LED backlight subarea at the preset safe current within the preset duration.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
judging whether the film source format of the image data to be displayed is a preset format or not, or judging whether the current image display mode is a preset image display mode or not;
and if the format of the image data to be displayed is a preset format or the current image display mode is a preset image display mode, adjusting the current of each LED backlight subarea to be a preset maximum current.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
recording a first continuous duration that the current duty ratio of the at least one LED backlight partition is higher than a preset current duty ratio;
when the fact that the current duty ratio of the at least one LED backlight partition is changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio is detected, recording a second continuous duration that the current duty ratio of the at least one LED backlight partition is lower than or equal to the preset current duty ratio;
and determining the accumulated duration that the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio according to the first continuous duration and the second continuous duration.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
inquiring a mapping relation table between the continuous duration and the back-off coefficient, and determining the back-off coefficient corresponding to the second continuous duration;
and multiplying the back-off coefficient by the second continuous duration to obtain a back-off duration, and subtracting the back-off duration from the first continuous duration to determine the accumulated duration.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
acquiring a preset back-off coefficient, and multiplying the preset back-off coefficient by the second continuous duration to acquire a back-off duration;
subtracting the back-off duration from the first continuous duration to determine an accumulated duration that the current duty cycle of the at least one LED backlight partition is higher than a preset current duty cycle.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
triggering the sleep protection timing when the current duty ratio of at least one LED backlight partition is detected to be higher than the preset current duty ratio;
and when the accumulated time length of the sleep protection timing reaches the preset accumulated time length, reducing the current of each LED backlight subarea into a preset safe current.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
calculating the power of each LED backlight partition, and adding the power of each LED backlight partition to obtain the total power of the LEDs;
comparing the total power of the LEDs with a preset power supply power;
and if the total power of the LEDs is higher than the power of a preset power supply, adjusting the current duty ratio of each LED backlight partition.
Further, the processor 1001 may call the LED over-temperature protection program stored in the memory 1005, and further perform the following steps:
calculating the ratio of the total power of the LEDs to the power of a preset power supply, and acquiring the current duty ratio of each LED backlight partition;
and multiplying the ratio of the total power of the LEDs to the power of a preset power supply by the current duty ratio of each LED backlight partition so as to adjust the current duty ratio of each LED backlight partition.
The specific embodiment of the LED over-temperature protection terminal of the present invention is substantially the same as each specific embodiment of the LED over-temperature protection method described below, and will not be described herein again.
The invention provides an LED over-temperature protection method.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the LED over-temperature protection method of the present invention.
In this embodiment, the LED over-temperature protection method includes:
step S101, when image data to be displayed is received, whether the current of each LED backlight partition is adjusted to be a preset maximum current or not is determined according to a chip source format or a current image display mode of the image data to be displayed;
in this embodiment, the LED over-temperature protection method may be selectively applied to a television terminal, or may be selectively applied to a mobile terminal, and the following explanation takes the television terminal as an example. The television terminal comprises a liquid crystal display screen, the liquid crystal display screen uses an LED as a backlight source, the liquid crystal display screen comprises a plurality of LED backlight partitions, each LED backlight partition at least comprises one LED, and it needs to be noted that the current duty ratio and the current of the LED backlight partition are the current duty ratio and the current of each LED in the LED backlight partition; the image display modes of the Television terminal include, but are not limited to, a standard mode, a bright mode, a Dynamic mode, a soft mode, a natural mode, and a movie mode, and the film source formats include, but are not limited to, an HDR (High-Dynamic Range image) format, a dvdrop format, an HR-HDTV (High Resolution High Definition Television) format, and a BD format (Blu-ray Disc).
When the television terminal receives image data to be displayed, whether the current of each LED backlight partition is adjusted to be the preset maximum current or not is determined according to the film source format or the current image display mode of the image data to be displayed. Specifically, in the present embodiment, step S101 includes:
step A1: judging whether the film source format of the image data to be displayed is a preset format or not, or judging whether the current image display mode is a preset image display mode or not;
step A2: and if the format of the image data to be displayed is a preset format or the current image display mode is a preset image display mode, adjusting the current of each LED backlight subarea to be a preset maximum current.
When the television terminal receives image data to be displayed, judging whether a chip source format of the image data to be displayed is a preset format, if so, adjusting the current of each LED backlight partition to be a preset maximum current, and if not, determining the backlight brightness of each LED backlight partition according to a brightness histogram of the image data to be displayed. Or when the television terminal receives image data to be displayed, judging whether the current image display mode of the television terminal is a preset image display mode, if the current image display mode of the television terminal is the preset image display mode, adjusting the current of each LED backlight partition to be a preset maximum current, and if the current image display mode of the television terminal is not the preset image display mode, determining the backlight brightness of each LED backlight partition according to the brightness histogram of the image data to be displayed. It should be noted that the preset maximum current, the preset format, and the preset image display mode may be set by those skilled in the art based on actual situations, and this embodiment is not particularly limited to this, and preferably, the preset maximum current is 180 milliamperes, the preset format is an HDR format or a BD format, and the preset image display mode is a bright mode or a movie mode.
Step S102, if the current of each LED backlight partition is adjusted to be the preset maximum current, determining whether the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio;
if the television terminal adjusts the current of each LED backlight partition to be the preset maximum current, determining whether the current duty ratio of at least one LED backlight partition in each LED backlight partition of the television terminal is higher than the preset current duty ratio, namely, acquiring a brightness histogram of image data to be displayed, determining the current duty ratio of each LED backlight partition according to the brightness histogram, and then determining whether the current duty ratio of each LED backlight partition is lower than the preset current duty ratio. It should be noted that the preset current duty ratio may be set by a person skilled in the art based on actual situations, and this embodiment is not particularly limited thereto.
Step S103, if the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio, determining the accumulated duration of the current duty ratio of the at least one LED backlight partition higher than the preset current duty ratio;
and if the current duty ratio of at least one LED backlight partition exists in each LED backlight partition, the television terminal determines the accumulated duration of the current duty ratio of the at least one LED backlight partition being higher than the preset current duty ratio. Specifically, referring to fig. 3, step S103 includes:
step S1031, recording a first continuous duration that the current duty ratio of at least one LED backlight partition is higher than a preset current duty ratio;
step S1032, when the fact that the current duty ratio of the at least one LED backlight partition is changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio is detected, recording a second continuous duration that the current duty ratio of the at least one LED backlight partition is lower than or equal to the preset current duty ratio;
step S1033, determining an accumulated duration that the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio according to the first continuous duration and the second continuous duration.
The method comprises the steps that a television terminal firstly records a first continuous duration when the current duty ratio of at least one LED backlight partition is higher than a preset current duty ratio, namely when the current duty ratio of any LED backlight partition is detected to be higher than the preset current duty ratio, the starting time is recorded, when the current duty ratio of the corresponding LED backlight partition is detected to be changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio, the ending time is recorded, and the first continuous duration when the current duty ratio of the corresponding LED backlight partition is higher than the preset current duty ratio is calculated based on the recorded starting time and the recorded ending time;
then when the current duty ratio of at least one LED backlight partition is detected to be changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio, recording a second continuous duration when the current duty ratio of at least one LED backlight partition is detected to be lower than or equal to the preset current duty ratio from being higher than the preset current duty ratio, namely, when the current duty ratio of at least one LED backlight partition is detected to be lower than or equal to the preset current duty ratio from being higher than the preset current duty ratio, recording a starting moment, when the current duty ratio of the corresponding LED backlight partition is detected to be higher than the preset current duty ratio from being lower than or equal to the preset current duty ratio, recording an ending moment, and calculating a second continuous duration when the current duty ratio of the corresponding LED backlight partition is lower than or equal to the preset;
and finally, determining the accumulated duration that the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio according to the first continuous duration and the second continuous duration, namely determining the back-off duration according to the first continuous duration and/or the second continuous duration, and then subtracting the back-off duration from the first continuous duration to obtain the accumulated duration that the current duty ratio of the corresponding LED backlight partition is higher than the preset current duty ratio. It should be noted that, when the second continuous duration is longer than the first continuous duration, a duration difference between the second continuous duration and the first continuous duration is calculated, and when the duration difference is longer than a set value, an accumulated duration that the current duty ratio of the corresponding LED backlight partition is longer than the preset current duty ratio may be determined as zero. The first continuous duration is lower than a preset accumulated duration, and the accumulated duration is determined based on the first continuous duration and the second continuous duration.
The specific determination mode of the accumulated duration comprises the following steps:
mode 1: in this embodiment, step S1033 specifically includes:
step B1: inquiring a mapping relation table between the continuous duration and the back-off coefficient, and determining the back-off coefficient corresponding to the second continuous duration;
step B2: multiplying the backoff coefficient by the second continuous duration to obtain a backoff duration, and subtracting the backoff duration from the first continuous duration to determine an accumulated duration.
Assuming that the accumulated duration is T, the backoff factor is k, the first duration is T1, and the second duration is T2, the accumulated duration may be represented as T1-T2 × k. After the television terminal acquires the first continuous duration and the second continuous duration, inquiring a mapping relation table between the continuous duration and the back-off coefficient, determining the back-off coefficient corresponding to the second continuous duration, multiplying the back-off coefficient and the second continuous duration to acquire the back-off duration, and subtracting the back-off duration from the first continuous duration to determine the accumulated duration. It should be noted that the table of the mapping relationship between the continuous duration and the back-off coefficient is obtained by those skilled in the art based on a plurality of experiments, and the back-off coefficient is less than or equal to 1. For example, assuming that the first continuous duration is 8 seconds, the second continuous duration is 2 seconds, and the backoff factor corresponding to the second continuous duration is 0.5, the cumulative duration is 8-2 × 0.5 to 7 seconds, and assuming that the first continuous duration is 12 seconds, the second continuous duration is 5 seconds, and the backoff factor corresponding to the second continuous duration is 0.4, the cumulative duration is 12-5 × 0.4 to 10 seconds. In this embodiment, by setting the mapping relationship table between the continuous duration and the back-off coefficient, a more accurate back-off coefficient can be obtained, so that the back-off of the accumulated duration is performed when the back-off condition is satisfied, and further, the current of the corresponding LED backlight partition is reduced due to the fact that the determined accumulated duration is inaccurate, and the image display effect of the television terminal is reduced.
Mode 2: in this embodiment, step S1033 specifically includes:
step B3: acquiring a preset back-off coefficient, and multiplying the preset back-off coefficient by the second continuous duration to acquire a back-off duration;
step B4: subtracting the back-off duration from the first duration to determine an accumulated duration that the current duty cycle of the at least one LED backlight partition is higher than the preset current duty cycle.
After the television terminal acquires the first continuous duration and the second continuous duration, acquiring a preset back-off coefficient, multiplying the preset back-off coefficient by the second continuous duration to acquire a back-off duration, and subtracting the back-off duration from the first continuous duration to determine that the current duty ratio of the at least one LED backlight partition is higher than the accumulated duration of the preset current duty ratio, where it should be noted that the preset back-off coefficient is obtained by a person skilled in the art based on multiple tests, and preferably, the preset back-off coefficient is 0.2. For example, if the first continuous duration is 10 seconds, the second continuous duration is 4 seconds, and the predetermined backoff factor is 0.2, the cumulative duration is 10-4 × 0.2 seconds to 9.2 seconds, and if the first continuous duration is 8 seconds, the second continuous duration is 5 seconds, and the predetermined backoff factor is 0.2, the cumulative duration is 8-5 × 0.2 seconds to 7 seconds. In this embodiment, by setting the back-off coefficient, the back-off of the accumulated duration can be performed when the back-off condition is satisfied, thereby effectively preventing the current of the corresponding LED backlight partition from being reduced due to the inaccuracy of the determined accumulated duration, and reducing the image display effect of the television terminal.
Mode 3: in the embodiment, in the process of determining the accumulated duration, when it is detected that the current duty ratio of at least one LED backlight partition changes from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio, a first current temperature of the corresponding LED backlight partition is obtained, and when it is detected that the current duty ratio of the corresponding LED backlight partition changes from being lower than or equal to the preset current duty ratio to being higher than the preset current duty ratio, a second current temperature of the corresponding LED backlight partition is obtained, and then the accumulated duration of the current duty ratio of the corresponding LED backlight partition being higher than the preset current duty ratio is determined according to the first current temperature and the second current temperature, that is, a temperature difference between the first current temperature and the second current temperature is calculated, a mapping relation table between the temperature difference and a back-off coefficient is queried, a back-off coefficient corresponding to the temperature difference is determined, and then the back-off coefficient is multiplied by the second continuous duration, and subtracting the back-off duration from the first continuous duration to determine the accumulated duration that the current duty ratio of the corresponding LED backlight partition is higher than the preset current duty ratio. It should be noted that the mapping table between the temperature difference and the inverse coefficient is obtained by those skilled in the art based on a plurality of experiments. In the embodiment, because the generation and the dissipation of heat are both related to the temperature, the back-off coefficient can be more accurately determined through the temperature difference, and the back-off of the accumulated duration can be performed when the back-off condition is met, so that the current of the corresponding LED backlight partition is further effectively prevented from being reduced due to the fact that the determined accumulated duration is inaccurate, and the image display effect of the television terminal is reduced.
The specific determination manner of the accumulated duration listed above is only exemplary, and those skilled in the art may utilize the technical idea of the present invention, and other various specific manners for determining the accumulated duration proposed according to their specific requirements are within the protection scope of the present invention, and are not exhaustive herein.
And step S104, if the accumulated duration reaches a preset threshold, reducing the current of the at least one LED backlight partition into a preset safe current, and keeping the current of the at least one LED backlight partition at the preset safe current within the preset duration.
After the television terminal determines the accumulated duration, whether the accumulated duration reaches a preset threshold is determined, if the accumulated duration reaches the preset threshold, the current of at least one LED backlight partition is reduced to a preset safe current, and the current of at least one LED backlight partition is kept at the preset safe current within the preset duration, namely, the temperature of the corresponding LED backlight partition can be quickly reduced by reducing the current of the corresponding LED backlight partition and keeping the current for a period of time. It should be noted that the preset threshold, the preset safety current and the preset time period may be set by those skilled in the art based on practical situations, which are not specifically limited in this embodiment, and preferably, the preset threshold is 15 seconds, the preset safety current is 130 milliamperes, and the preset time period is 30 seconds.
In this embodiment, for a terminal using LEDs as a backlight, when receiving image data to be displayed and the current of each LED backlight partition is a preset maximum current, the present invention determines whether the current duty ratio of at least one LED backlight partition is higher than a preset current duty ratio, if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, determines the accumulated duration time that the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, and if the accumulated duration time reaches a preset threshold, reduces the current corresponding to the LED backlight partition to a safe current and keeps for a period of time, since the current of each LED backlight partition reaches the maximum, the image display effect is effectively enhanced, and at the same time, when the current duty ratio of any LED backlight partition is higher than a limit value and continues to be limited, the current corresponding to the LED backlight partition is reduced, and the temperature of the corresponding LED backlight subarea can be quickly reduced after a period of time, the LED is prevented from being damaged due to overhigh temperature, the service life of the LED is prolonged, and the service life of the LED is prolonged while the image display effect is considered.
Further, referring to fig. 4, a second embodiment of the LED over-temperature protection method of the present invention is proposed based on the first embodiment, and the difference from the previous embodiment is that the LED over-temperature protection method further includes:
step S105, when the current duty ratio of at least one LED backlight partition is detected to be higher than a preset current duty ratio, triggering sleep protection timing;
and step S106, when the accumulative duration of the sleep protection timing reaches the preset accumulative duration, reducing the current of each LED backlight subarea into a preset safe current.
It should be noted that, based on the foregoing embodiments, the present invention provides a specific sleep mode for LED backlight partition, and only this will be described below, and other embodiments can be referred to.
When the television terminal detects that the current duty ratio of at least one LED backlight partition exists in each LED backlight partition is higher than the preset current duty ratio, the sleep protection timing is triggered, namely, the cumulative duration of the sleep protection timing is recorded, when the cumulative duration of the sleep protection timing reaches the preset cumulative duration, the current of each LED backlight partition is reduced to be the preset safe current and is continuously set for a duration, and when the duration of the current of each LED backlight partition, which is the preset safe current, reaches the set duration, the current of each LED backlight partition is increased to be the preset maximum current. It should be noted that the preset safe current, the preset accumulated time period, and the preset maximum current may all be set by a person skilled in the art based on actual conditions, which is not specifically limited in this embodiment, and preferably, the preset safe current, the preset accumulated time period, and the preset maximum current are 130 milliamperes, 2 hours, and 180 milliamperes, respectively.
In this embodiment, when the sleep condition of the LED backlight partitions is satisfied, the current of each LED backlight partition is reduced to the safe current, so as to further improve the service life of the LED backlight partition.
Further, based on the first or second embodiment, a third embodiment of the LED over-temperature protection method of the present invention is provided, which is different from the foregoing embodiment in that the LED over-temperature protection method further includes:
and C: calculating the power of each LED backlight partition, and adding the power consumption of each LED backlight partition to obtain the total power of the LEDs;
step D: comparing the total power of the LEDs with the preset power supply power;
step E: and if the total power of the LEDs is higher than the preset power supply power, adjusting the current duty ratio of each LED backlight partition.
The present invention proposes a specific adjustment method of the current duty ratio based on the foregoing embodiments, and only this will be described below, and other embodiments can be referred to.
The television terminal calculates the power of each LED backlight partition, adds the power of each LED backlight partition to obtain the total power of the LEDs, compares the total power of the LEDs with the power of a preset power supply, and adjusts the current duty ratio of each LED backlight partition if the total power of the LEDs is higher than the power of the preset power supply.
Specifically, in this embodiment, step E includes:
step E1, calculating the ratio of the total power of the LEDs to the power of a preset power supply, and acquiring the current duty ratio of each LED backlight partition;
and E2, multiplying the ratio of the total power of the LEDs to the power of the preset power supply by the current duty ratio of each LED backlight partition so as to adjust the current duty ratio of each LED backlight partition.
Wherein, the current duty ratio is set to duty1, the total power of the LEDs is set to P, and the power of the preset power supply is set to PmaxAnd the adjusted current duty cycle is duty2, then the adjusted current duty cycle is duty2 (P/P)max) duty 1. The television terminal calculates the ratio of the total power of the LEDs to the preset power supply power, acquires the current duty ratio of each LED backlight partition, and multiplies the ratio of the total power of the LEDs to the preset power supply power by the current duty ratio of each LED backlight partition to adjust the current duty ratio of each LED backlight partition. It should be noted that the preset power may be set by a person skilled in the art based on actual conditions, and this embodiment is not limited in this respect.
In the embodiment, when the sum of the power of each LED backlight partition is higher than the set power, the current duty ratio of each LED backlight partition can be adjusted, the power supply is prevented from being damaged due to overhigh power, and the service life of the power supply is prolonged.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where an LED over-temperature protection program is stored on the computer-readable storage medium, and when executed by a processor, the LED over-temperature protection program implements the following steps:
when image data to be displayed is received, determining whether the current of each LED backlight partition is adjusted to be a preset maximum current or not according to a film source format or a current image display mode of the image data to be displayed;
if the current of each LED backlight partition is adjusted to be the preset maximum current, determining whether the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio;
if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, determining the accumulated duration of the current duty ratio of the at least one LED backlight partition higher than the preset current duty ratio;
and if the accumulated duration reaches a preset threshold, reducing the current of the at least one LED backlight subarea to a preset safe current, and keeping the current of the at least one LED backlight subarea at the preset safe current within the preset duration.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
judging whether the film source format of the image data to be displayed is a preset format or not, or judging whether the current image display mode is a preset image display mode or not;
and if the format of the image data to be displayed is a preset format or the current image display mode is a preset image display mode, adjusting the current of each LED backlight subarea to be a preset maximum current.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
recording a first continuous duration that the current duty ratio of the at least one LED backlight partition is higher than a preset current duty ratio;
when the fact that the current duty ratio of the at least one LED backlight partition is changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio is detected, recording a second continuous duration that the current duty ratio of the at least one LED backlight partition is lower than or equal to the preset current duty ratio;
and determining the accumulated duration that the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio according to the first continuous duration and the second continuous duration.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
inquiring a mapping relation table between the continuous duration and the back-off coefficient, and determining the back-off coefficient corresponding to the second continuous duration;
and multiplying the back-off coefficient by the second continuous duration to obtain a back-off duration, and subtracting the back-off duration from the first continuous duration to determine the accumulated duration.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
acquiring a preset back-off coefficient, and multiplying the preset back-off coefficient by the second continuous duration to acquire a back-off duration;
subtracting the back-off duration from the first continuous duration to determine an accumulated duration that the current duty cycle of the at least one LED backlight partition is higher than a preset current duty cycle.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
triggering the sleep protection timing when the current duty ratio of at least one LED backlight partition is detected to be higher than the preset current duty ratio;
and when the accumulated time length of the sleep protection timing reaches the preset accumulated time length, reducing the current of each LED backlight subarea into a preset safe current.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
calculating the power of each LED backlight partition, and adding the power of each LED backlight partition to obtain the total power of the LEDs;
comparing the total power of the LEDs with a preset power supply power;
and if the total power of the LEDs is higher than the power of a preset power supply, adjusting the current duty ratio of each LED backlight partition.
Further, when being executed by the processor, the LED over-temperature protection program further realizes the following steps:
calculating the ratio of the total power of the LEDs to the power of a preset power supply, and acquiring the current duty ratio of each LED backlight partition;
and multiplying the ratio of the total power of the LEDs to the power of a preset power supply by the current duty ratio of each LED backlight partition so as to adjust the current duty ratio of each LED backlight partition.
The specific embodiment of the computer-readable storage medium of the present invention is substantially the same as the specific embodiments of the LED over-temperature protection method described above, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An LED over-temperature protection method is characterized by comprising the following steps:
when image data to be displayed is received, determining whether the current of each LED backlight partition is adjusted to be a preset maximum current or not according to a film source format or a current image display mode of the image data to be displayed;
if the current of each LED backlight partition is adjusted to be the preset maximum current, determining whether the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio;
if the current duty ratio of at least one LED backlight partition is higher than the preset current duty ratio, determining the accumulated duration of the current duty ratio of the at least one LED backlight partition higher than the preset current duty ratio;
if the accumulated duration reaches a preset threshold, reducing the current of the at least one LED backlight subarea to a preset safe current, and keeping the current of the at least one LED backlight subarea at the preset safe current within the preset duration;
wherein the step of determining the accumulated duration that the current duty cycle of the at least one LED backlight partition is higher than the preset current duty cycle comprises:
recording a first continuous duration that the current duty ratio of the at least one LED backlight partition is higher than a preset current duty ratio;
when the fact that the current duty ratio of the at least one LED backlight partition is changed from being higher than the preset current duty ratio to being lower than or equal to the preset current duty ratio is detected, recording a second continuous duration that the current duty ratio of the at least one LED backlight partition is lower than or equal to the preset current duty ratio;
and determining the accumulated duration that the current duty ratio of the at least one LED backlight partition is higher than the preset current duty ratio according to the first continuous duration and the second continuous duration.
2. The LED over-temperature protection method of claim 1, wherein the step of determining whether to adjust the current of each LED backlight partition to a preset maximum current according to the slice source format of the image data to be displayed or the current image display mode comprises:
judging whether the film source format of the image data to be displayed is a preset format or not, or judging whether the current image display mode is a preset image display mode or not;
and if the format of the image data to be displayed is a preset format or the current image display mode is a preset image display mode, adjusting the current of each LED backlight subarea to be a preset maximum current.
3. The method of claim 1, wherein determining the cumulative duration that the current duty cycle of the at least one LED backlight partition is higher than the preset current duty cycle based on the first continuous duration and the second continuous duration comprises:
inquiring a mapping relation table between the continuous duration and the back-off coefficient, and determining the back-off coefficient corresponding to the second continuous duration;
and multiplying the back-off coefficient by the second continuous duration to obtain a back-off duration, and subtracting the back-off duration from the first continuous duration to determine the accumulated duration.
4. The method of claim 1, wherein determining the cumulative duration that the current duty cycle of the at least one LED backlight partition is higher than the preset current duty cycle based on the first continuous duration and the second continuous duration further comprises:
acquiring a preset back-off coefficient, and multiplying the preset back-off coefficient by the second continuous duration to acquire a back-off duration;
subtracting the back-off duration from the first continuous duration to determine an accumulated duration that the current duty cycle of the at least one LED backlight partition is higher than a preset current duty cycle.
5. The LED over-temperature protection method according to any one of claims 1-4, further comprising:
triggering the sleep protection timing when the current duty ratio of at least one LED backlight partition is detected to be higher than the preset current duty ratio;
and when the accumulated time length of the sleep protection timing reaches the preset accumulated time length, reducing the current of each LED backlight subarea into a preset safe current.
6. The LED over-temperature protection method according to any one of claims 1-4, further comprising:
calculating the power of each LED backlight partition, and adding the power of each LED backlight partition to obtain the total power of the LEDs;
comparing the total power of the LEDs with a preset power supply power;
and if the total power of the LEDs is higher than the power of a preset power supply, adjusting the current duty ratio of each LED backlight partition.
7. The method of claim 6, wherein the step of adjusting the current duty cycle of each LED backlight partition comprises:
calculating the ratio of the total power of the LEDs to the power of a preset power supply, and acquiring the current duty ratio of each LED backlight partition;
and multiplying the ratio of the total power of the LEDs to the power of a preset power supply by the current duty ratio of each LED backlight partition so as to adjust the current duty ratio of each LED backlight partition.
8. The utility model provides a LED excess temperature protection terminal which characterized in that, LED excess temperature protection terminal includes: memory, a processor and an LED over-temperature protection program stored on the memory and executable on the processor, the LED over-temperature protection program when executed by the processor implementing the steps of the LED over-temperature protection method according to any one of claims 1 to 7.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon an LED over-temperature protection program, which when executed by a processor implements the steps of the LED over-temperature protection method according to any one of claims 1 to 7.
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| CN113129841B (en) * | 2019-12-30 | 2022-06-10 | 惠州视维新技术有限公司 | Partitioned backlight control method, terminal and storage medium |
| CN112382240A (en) * | 2020-10-30 | 2021-02-19 | Oppo广东移动通信有限公司 | Backlight control method and device, electronic equipment and readable storage medium |
| CN112218411A (en) * | 2020-11-03 | 2021-01-12 | 深圳茂硕电子科技有限公司 | LED power supply state monitoring method |
| CN112967687A (en) * | 2021-02-26 | 2021-06-15 | Tcl华星光电技术有限公司 | Method for preventing backlight module from overheating and display device |
| CN114420040A (en) * | 2021-11-17 | 2022-04-29 | 高创(苏州)电子有限公司 | Control method and device of display panel, electronic equipment and storage medium |
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