CN109256095B - LED current protection method, display and storage medium - Google Patents

LED current protection method, display and storage medium Download PDF

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Publication number
CN109256095B
CN109256095B CN201811248428.2A CN201811248428A CN109256095B CN 109256095 B CN109256095 B CN 109256095B CN 201811248428 A CN201811248428 A CN 201811248428A CN 109256095 B CN109256095 B CN 109256095B
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current
preset
average value
led
led backlight
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CN109256095A (en
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陈洪波
肖志林
全晓荣
刘海安
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Shenzhen Skyworth RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention discloses an LED current protection method, a display and a storage medium, comprising the following steps: acquiring the current average value of each partition of the LED backlight within a preset time; obtaining the maximum current average value in all the subareas according to the current average value of each subarea of the LED backlight; determining whether the maximum current average value is greater than a preset current frame voltage extreme value; and if the maximum current average value is larger than the preset current frame voltage extreme value, setting the current of each subarea of the LED backlight as the preset safe current. The invention can monitor the current average value of each subarea of the LED backlight and adjust the current of each subarea of the LED backlight when the maximum current average value is overhigh, thereby improving the service life of the LED and enhancing the safety of the LED backlight while ensuring the display effect.

Description

LED current protection method, display and storage medium
Technical Field
The invention relates to the field of displays, in particular to a light-emitting diode (LED) current protection method, a display and a storage medium.
Background
With the rapid development of liquid crystal display technology, the resolution of the liquid crystal display is higher and higher, and more image display processing technologies can be realized. In the prior art, LEDs (Light Emitting diodes) are widely used as backlight sources in liquid crystal displays. The LED can adjust the LED backlight through a local dimming boost function, so that the contrast of a display picture is greatly improved. The local dimming boost function is to control the current of a plurality of LED backlight partitions to realize the local adjustment of the LED backlight.
When the current of each subarea of the LED backlight is adjusted, the current flowing through the LED is also improved along with the increase of the contrast, and the LED is kept under the condition of larger current for a long time, so that the heating and the temperature rise of the LED are easily caused, the service life of the LED is influenced, and the LED is also easily damaged due to overheating. Therefore, how to reduce the current of the LED under the condition of a large current to avoid life attenuation and potential safety hazard is a problem to be solved urgently at present.
Disclosure of Invention
The invention mainly aims to provide an LED current protection method, a display and a storage medium, aiming at monitoring and adjusting the current of an LED backlight and avoiding the problems of service life attenuation and potential safety hazard of an LED caused by overhigh current.
In order to achieve the above object, the present invention provides an LED current protection method, including the steps of:
acquiring the current average value of each partition of the LED backlight within a preset time;
obtaining the maximum current average value in all the subareas according to the current average value of each subarea of the LED backlight;
determining whether the maximum current average value is greater than a preset current frame voltage extreme value;
and if the maximum current average value is larger than the preset current frame voltage extreme value, setting the current of each subarea of the LED backlight as the preset safe current.
Optionally, the step of obtaining the maximum current average value in all the partitions according to the current average value of each partition of the LED backlight includes:
determining whether the maximum current average value is larger than a preset current frame voltage threshold value;
and if the maximum current average value is larger than a preset current frame voltage threshold value, acquiring a preset current frame voltage extreme value, wherein the preset current frame voltage extreme value is larger than the preset current frame voltage threshold value.
Optionally, the step of determining whether the maximum current average value is greater than a preset current frame voltage threshold value is followed by:
if the maximum current average value is less than or equal to a preset current frame voltage threshold value, returning to the execution step: and acquiring the current average value of each partition of the LED backlight within a preset time.
Optionally, the step of determining whether the maximum current average value is greater than a preset current frame voltage limit value is followed by:
if the maximum current average value is less than or equal to the preset current frame voltage extreme value, increasing the preset duration, and executing the following steps: and acquiring the current average value of each partition of the LED backlight within a preset time.
Optionally, the step of obtaining the average value of the current of each partition of the LED backlight within the preset time includes:
starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
the step of increasing the preset time length further comprises the following steps:
if the maximum current average value is less than or equal to a preset current frame voltage extreme value, judging whether the timing time reaches a preset time threshold value, wherein the preset time threshold value is greater than the preset time length;
and when the timing time does not reach a preset time threshold value, executing a step of increasing a preset time length.
Optionally, the step of determining whether the timing time reaches the preset time threshold includes:
when the timing time reaches a preset time threshold, judging whether the maximum current average value is greater than a preset current final value, wherein the preset current final value is greater than a preset current frame voltage threshold;
if the maximum current average value is less than or equal to a preset current final value, returning to the execution step: starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
and if the maximum current average value is larger than the preset current final value, setting the current of each subarea of the LED backlight as the preset safe current.
Optionally, the step of setting the current of each partition of the LED backlight to the preset safe current includes:
reducing the PWM duty ratio of each partition current of the LED backlight to set each partition current of the LED backlight as a preset safe current;
and keeping the current of each subarea of the LED backlight at the preset safe current within the preset current reduction duration.
Optionally, after the step of maintaining the current of each section of the LED backlight at the preset safe current for the preset current reduction time period, the method includes:
when the preset current reduction duration is reached, improving the PWM duty ratio of the current of each partition of the LED backlight to recover the current of each partition of the LED backlight, and executing the following steps: and acquiring the current average value of each partition of the LED backlight within a preset time.
Further, to achieve the above object, the present invention also provides a display comprising: a memory, a processor and a LED current protection program stored on the memory and executable on the processor, the LED current protection program when executed by the processor implementing the steps of the LED current protection method as described above.
Further, to achieve the above object, the present invention also provides a computer readable storage medium having stored thereon an LED current protection program, which when executed by a processor, implements the steps of the LED current protection method as described above.
According to the LED current protection method, the display and the storage medium provided by the embodiment of the invention, the LED backlight partition with the largest current average value is obtained by obtaining the average value of the current of each partition of the LED backlight within a preset certain time period, and the current average value of the partition is the maximum current average value. And comparing the maximum current average value with a preset current frame voltage extreme value, and when the maximum current average value is greater than the preset current frame voltage extreme value, judging that the current of the LED backlight is overlarge at the moment, and reducing the current of each subarea of the LED backlight to a preset safe current. By monitoring the current of each partition of the LED backlight and timely adjusting the current when the current is too large, the potential safety hazards of service life attenuation of the LED, burning out of the LED and the like caused by the too large current are avoided, and the service life of the LED is prolonged while the image effect of the display is ensured.
Drawings
FIG. 1 is a schematic 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 LED current protection method according to the present invention;
fig. 3 is a schematic flow chart of a second embodiment and a third embodiment of the LED current protection method according to the present invention;
fig. 4 is a schematic flow chart of a fourth embodiment and a fifth embodiment of the LED current protection method according to the present invention;
fig. 5 is a detailed flowchart of step S40 in the first embodiment of the LED current 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.
As shown in fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal in the embodiment of the present invention may be a display, a PC (Personal Computer), a television, a smart phone, a tablet Computer, an e-book reader, an MP3(Moving Picture Experts Group Audio Layer III, motion Picture Experts compression standard Audio Layer 3) player, an MP4(Moving Picture Experts Group Audio Layer IV, motion Picture Experts compression standard Audio Layer 4) player, a portable Computer, or a mobile terminal device with a display function.
As shown in fig. 1, the 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 terminal may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that adjusts the brightness of the display screen based on the ambient light level and a proximity sensor that turns off the display screen and/or backlight when the hardware device is moved to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when the motion sensor is stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for recognizing the attitude of hardware equipment, and related functions (such as pedometer and tapping) for vibration recognition; of course, the hardware device may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and so on, which are not described herein again.
The processor 1001 may be configured to call the LED current protection program stored in the memory 1005, and execute the following steps implemented in the LED current protection method:
acquiring the current average value of each partition of the LED backlight within a preset time;
obtaining the maximum current average value in all the subareas according to the current average value of each subarea of the LED backlight;
determining whether the maximum current average value is greater than a preset current frame voltage extreme value;
and if the maximum current average value is larger than the preset current frame voltage extreme value, setting the current of each subarea of the LED backlight as the preset safe current.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
determining whether the maximum current average value is larger than a preset current frame voltage threshold value;
and if the maximum current average value is larger than a preset current frame voltage threshold value, acquiring a preset current frame voltage extreme value, wherein the preset current frame voltage extreme value is larger than the preset current frame voltage threshold value.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
if the maximum current average value is less than or equal to a preset current frame voltage threshold value, returning to the execution step: and acquiring the current average value of each partition of the LED backlight within a preset time.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
if the maximum current average value is less than or equal to the preset current frame voltage extreme value, increasing the preset duration, and executing the following steps: and acquiring the current average value of each partition of the LED backlight within a preset time.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
if the maximum current average value is less than or equal to a preset current frame voltage extreme value, judging whether the timing time reaches a preset time threshold value, wherein the preset time threshold value is greater than the preset time length;
and when the timing time does not reach a preset time threshold value, executing a step of increasing a preset time length.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
when the timing time reaches a preset time threshold, judging whether the maximum current average value is greater than a preset current final value, wherein the preset current final value is greater than a preset current frame voltage threshold;
if the maximum current average value is less than or equal to a preset current final value, returning to the execution step: starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
and if the maximum current average value is larger than the preset current final value, setting the current of each subarea of the LED backlight as the preset safe current.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
reducing the PWM duty ratio of each partition current of the LED backlight to set each partition current of the LED backlight as a preset safe current;
and keeping the current of each subarea of the LED backlight at the preset safe current within the preset current reduction duration.
Further, the processor 1001 may be configured to invoke the LED current protection program stored in the memory 1005, and further perform the following operations:
when the preset current reduction duration is reached, improving the PWM duty ratio of the current of each partition of the LED backlight to recover the current of each partition of the LED backlight, and executing the following steps: and acquiring the current average value of each partition of the LED backlight within a preset time.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the LED current protection method of the present invention, including the following steps:
step S10, acquiring the current average value of each partition of the LED backlight within a preset time;
in this embodiment, the LED current protection method may be applied to a display terminal such as a television terminal and a display, and may also be applied to a mobile terminal, and the following explanation is given by taking the television terminal as an example. The television terminal comprises a liquid crystal display screen, the liquid crystal display screen uses LEDs as backlight sources, the liquid crystal display screen comprises a plurality of LED backlight partitions, and each LED backlight partition at least comprises one LED. It should be noted that the current duty cycle and the current of the LED backlight partition are the current duty cycle and the current of each LED in the LED backlight partition.
When the television terminal displays image data through the LED backlight, all the partitions of the LED backlight are in a running state and have current passing through, wherein the current passing through all the partitions of the LED backlight is different in magnitude. The television terminal determines a preset time length and counts the average value of the currents flowing through all the partitions of the LED backlight in the preset time length. The current in different LED backlight subareas is different from time to time, and the current average value of each subarea obtained through final calculation is also different.
It should be noted that the average value of the current of the LEDs refers to the average value of the current of each LED in a preset time period, and the average value of the current of each LED partition refers to the average value of the current of all the LEDs in the LED partition in the preset time period. The average value of the current of each LED partition can also be the average value of the total current in the LED partition within a preset time period.
Step S20, obtaining the maximum current average value in all the subareas according to the current average value of each subarea of the LED backlight;
in this embodiment, after the current average value of each partition of the LED backlight is obtained through calculation, the partition with the largest current average value is selected from the current average values in all the partitions, and the current average value of the partition is the largest current average value.
Step S30, determining whether the maximum current average value is larger than a preset current frame voltage extreme value;
in this embodiment, after the maximum current average value of the LED backlight within the preset time is obtained, the corresponding preset current frame voltage extreme value is obtained according to the preset time. The preset current frame voltage extreme value is a preset current value, and within a preset time length, if the maximum current average value of the LED backlight reaches the value, the current pressure in the LED backlight is considered to be overlarge at the moment, and the current needs to be limited to protect the LED backlight.
If the maximum current average value is greater than the preset current frame voltage extreme value, executing step S40, and setting the current of each partition of the LED backlight as a preset safe current.
Comparing the maximum current average value of the LED backlight within the preset time with the preset current frame voltage extreme value, and when the maximum current average value is greater than the preset current frame voltage extreme value, indicating that the current passing through the LED backlight within the preset time is too large, the service life of the LED may be affected, and the LED backlight may be damaged. Because the average value of the current of the partition with the largest current pressure in the preset time in each partition of the LED is too large, the current in each partition of the LED needs to be reduced to the preset safe current so as to reduce the current of the LED backlight and protect the LED backlight and the display.
In this embodiment, when the LED backlight is in an operating state, currents flowing through the respective partitions of the LED backlight are not equal. According to the preset duration of the monitoring current, the current of each partition of the LED backlight within the duration is calculated in a statistical mode to obtain the current average value of each partition of the LED backlight within the duration, the partition with the largest current average value is selected from the current average values of the partitions to serve as the current largest partition, and the current average value of the partition is the maximum current average value. And comparing a preset current frame voltage extreme value corresponding to the detection current duration with the maximum current average value, and determining that the current flowing through the LED backlight in the duration is too large after the maximum current average value exceeds the preset current frame voltage extreme value, so that the current of all the subareas of the LED backlight is adjusted to reduce the current of each subarea to a preset safe current, and the LED backlight can safely work for a long time under the preset safe current.
After the currents of all the partitions in the LED backlight within a certain time are counted and the average value of the currents is obtained, if the judgment shows that the current pressure of the LED backlight is too large at the moment, the current of the LED backlight is adjusted so as to avoid the LED backlight from being damaged due to the fact that the LED backlight is in a state of too high current for a long time. The LED backlight protection device can effectively protect the internal LED by adjusting the current of the LED backlight under the condition of ensuring the normal work of the LED backlight, and improves the service life of the LED while ensuring the display effect.
Further, referring to fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the LED current protection method of the present invention, in this embodiment, the step S20, obtaining the maximum current average value in all the partitions according to the current average value of each partition of the LED backlight includes:
step S50, determining whether the maximum current average value is larger than a preset current frame voltage threshold value;
if the maximum current average value is greater than the preset current frame voltage threshold, executing step S60 to obtain a preset current frame voltage extreme value, where the preset current frame voltage extreme value is greater than the preset current frame voltage threshold.
In this embodiment, after obtaining the maximum current average value of the LED backlight, a preset current frame voltage threshold is obtained first, where the preset current frame voltage threshold refers to a threshold of a stable current when the LED backlight can operate for a long time. When the current frame voltage exceeds the preset current frame voltage threshold value, the current in the operation process of the LED backlight reaches the reminding value, and at the moment, if the LED backlight continues to operate under the condition of high current, the LED may be damaged. In this scheme, the value of the preset current frame voltage extreme value is greater than the value of the preset current frame voltage threshold, and when the maximum current average value is greater than the preset current frame voltage threshold, if the maximum current average value is also greater than the preset current frame voltage extreme value, it indicates that the current of the LED backlight is too high within the preset time period, and the current of each partition of the LED backlight needs to be reduced.
When the television terminal is in operation, the LED backlight on the display is in an operation state, the average value of each partition of the current of the LED backlight in a period of time is calculated, and when the maximum current average value is larger than a preset reminding value, namely a preset current frame voltage threshold value, whether the maximum current average value is larger than a preset warning value or not is judged, namely a preset current frame voltage extreme value is judged. And after the maximum current average value exceeds a preset current frame voltage extreme value, adjusting the current of the LED backlight to protect the LED.
Further, with reference to fig. 3 continuously, fig. 3 is a flowchart illustrating a second embodiment of the LED current protection method according to the present invention, in this embodiment, the step of determining whether the maximum current average value is greater than the preset current frame voltage threshold at step S50 includes:
and if the maximum current average value is less than or equal to the preset current frame voltage threshold value, returning to execute the step S10, and obtaining the current average value of each partition of the LED backlight within the preset time length.
In this embodiment, after the maximum current average value of the LED backlight and the preset current frame voltage threshold are obtained, if the maximum current average value does not exceed the preset current frame voltage threshold, that is, the maximum current average value is less than or equal to the preset current frame voltage threshold, it indicates that the current flowing through the LED backlight is small within the preset time, and the use of the LED is not affected, so that the operating state of the LED can be continuously maintained.
And after confirming that the current average value of the maximum partition of the LED backlight current still does not exceed the preset current frame voltage threshold value, re-acquiring the preset time length, and counting and calculating the current average value of each partition of the LED backlight in the next preset time length to continue the current protection of the LED backlight. When the fact that the average value of the current of the LED in a preset time period does not exceed the current value capable of working stably for a long time is confirmed, the average value of the current of the LED backlight partition in the next preset time period is recalculated, the data acquisition amount and the calculation amount can be effectively reduced, and the operation pressure of a processor in the television terminal is reduced.
Further, with reference to fig. 3 continuously, fig. 3 is a flowchart illustrating a third embodiment of the LED current protection method according to the present invention, in this embodiment, the step of determining whether the maximum current average value is greater than the preset current frame voltage limit value in step S30 includes:
and if the maximum current average value is less than or equal to the preset current frame voltage extreme value, executing the step S41, increasing the preset time length, returning to the step S10, and acquiring the current average value of each partition of the LED backlight within the preset time length.
In this embodiment, after determining that the maximum current average value is greater than the preset current frame voltage threshold, the preset current frame voltage extreme value is obtained, and then the maximum current average value is compared with the preset current frame voltage extreme value. It should be noted that, in the present technical solution, the preset current frame voltage threshold and the preset current frame voltage extreme are both preset current values, and the preset current frame voltage extreme is greater than the preset current frame voltage threshold. When the maximum current average value is less than or equal to the preset current frame voltage extreme value, the maximum current average value is between the preset current frame voltage threshold value and the preset current frame voltage extreme value, the current average value of the current maximum subarea of the LED backlight exceeds the current value of long-time stable work, but does not reach the current value needing to limit and protect the current of the LED backlight, and the average current of the LED backlight needs to be further monitored to determine whether to limit and protect the current of the LED backlight. By increasing the preset time, counting and calculating the maximum current average value of the LED backlight within the increased preset time, and continuing to execute the current protection step, the current of the LED backlight can be reduced when the current of the LED backlight is monitored to be overlarge, the LED is prevented from being damaged, and the service life of the LED is prolonged.
Further, referring to fig. 4, fig. 4 is a flowchart illustrating a fourth embodiment of the LED current protection method according to the present invention, in this embodiment, the step S10 of obtaining the average value of the current of each partition of the LED backlight within a preset time includes:
step S11, starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
in step S41, the step of increasing the preset duration further includes:
if the maximum current average value is less than or equal to a preset current frame voltage extreme value, executing step S42, and determining whether the timing time reaches a preset time threshold, where the preset time threshold is greater than the preset duration;
and when the timing time does not reach a preset time threshold value, executing a step of increasing a preset time length.
In this embodiment, after obtaining the preset time duration, timing is started, in the timing process, when the calculated maximum current average value of the LED backlight is greater than the preset current frame voltage threshold and less than or equal to the preset current frame voltage extreme value, before increasing the preset time duration, it is determined whether the timing time reaches the time threshold, and after the timing time does not reach the preset time threshold, the preset time duration is increased, and the current average value of each partition of the LED backlight in the increased preset time period is continuously obtained.
The preset time threshold is the termination time preset by a user, and when the termination time is reached, even if the maximum current average value is still in the interval of the preset current frame voltage threshold and the preset current frame voltage extreme value, the preset time length is not increased any more and the current average value of each subarea of the LED backlight in the time length is calculated. Due to the fact that the processor of the terminal is limited in operation capacity, operation rate and operation effect cannot be kept in the process that the preset time is increased all the time, a termination time needs to be set, when the timing time does not reach the termination time, the preset time is continuously increased, and current statistics of the LED backlight partitions in the preset time is carried out.
Further, referring to fig. 4, fig. 4 is a schematic flowchart of a fifth embodiment of the LED current protection method according to the present invention, in this embodiment, the step S42 of determining whether the timing time reaches the preset time threshold includes:
step S43, when the timing time reaches a preset time threshold, judging whether the maximum current average value is larger than a preset current final value, wherein the preset current final value is larger than the preset current frame voltage threshold;
if the maximum current average value is less than or equal to the preset current final value, returning to execute the step S11, starting timing, and obtaining the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
if the maximum current average value is greater than the preset current final value, executing step S44, and setting the current of each partition of the LED backlight as the preset safe current.
In this embodiment, after the timing time reaches the preset time threshold, it indicates that the end time has been reached, the maximum current average value of the LED backlight in the timing time is the current average value of the partition with the maximum LED current pressure in the period of time, the maximum current average value is compared with the preset current end value, similarly, the preset current end value is a preset current value, which indicates the current minimum value that the current of the LED backlight needs to be reduced due to the excessive current when the timing time reaches the end time, and the preset current end value is greater than the preset current frame voltage threshold. When the maximum current average value does not exceed the preset current final value, the current of the LED backlight does not need to be subjected to current reduction processing, and only the preset time length needs to be obtained again and the current statistics of the LED backlight partition in the preset time length is carried out; when the maximum current average value exceeds the preset current final value, the average value of the current flowing through the LED backlight within the timing time is too high, and the current of each partition of the LED backlight needs to be reduced to the preset safe current range, so as to protect the LED and improve the safety of the LED backlight.
Further, referring to fig. 5, fig. 5 is a detailed flowchart of the LED current protection method of the present invention, in this embodiment, the step S40 of setting the current of each partition of the LED backlight to the preset safe current includes:
step S45, reducing the PWM duty ratio of each partition current of the LED backlight to set each partition current of the LED backlight as a preset safe current;
and step S46, keeping the current of each partition of the LED backlight at the preset safe current within the preset current reduction duration.
In this embodiment, the current of each partition of the LED backlight is set to be the preset safe current, that is, the PWM duty of the current of each partition of the LED backlight is adjusted to reduce the current of each partition of the LED backlight to be the preset safe current or below the preset safe current, and the current is maintained for a period of time, and the preset current reduction duration is the duration of reducing the current of each partition of the LED backlight to be the preset safe current. After the current of the LED backlight is reduced, the LED backlight operates under a smaller current, the temperature of each subarea of the LED backlight is also reduced, and the effects of protecting the LED backlight and prolonging the service life of the LED are achieved.
Preferably, the PWM duty ratio of the current of each section of the LED backlight may be reduced to half of the original duty ratio to reduce the current when the LED backlight is operated. The preset down-flow duration may be set to a preset duration when the LED backlight exceeds a preset current frame voltage limit. The preset down-flow duration may also be set to a fixed duration, for example 10 minutes.
Further, with reference to fig. 5, in this embodiment, the step S46, after the step of maintaining the currents of the LED backlight partitions at the preset safe current for the preset current-dropping duration, includes:
step S47, when the preset current reduction duration is reached, the PWM duty ratio of the current of each partition of the LED backlight is increased to recover the current of each partition of the LED backlight, and the steps are executed: and acquiring the current average value of each partition of the LED backlight within a preset time.
In this embodiment, after the current of the LED backlight is reduced to the preset safe current and the preset current reduction duration is maintained, the current PWM duty of each partition of the LED backlight is increased, so that the current of the LED backlight is restored to the current required when the television terminal normally operates. And continuously acquiring the preset time, counting the average value of the current of each partition of the LED backlight in the preset time, and monitoring and adjusting the current of each partition of the LED backlight to avoid the service life attenuation of the LED and the potential safety hazard caused by overhigh current.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which an LED current protection program is stored, where the storage medium may be the Memory 1005 in the terminal in fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several instructions to enable a terminal device (which may be a mobile phone, a computer, a server, or a television, etc.) having a processor to execute the LED current protection method according to the embodiments of the present invention.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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 (8)

1. A LED current protection method is applied to a display and is characterized by comprising the following steps:
starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
obtaining the maximum current average value in all the subareas according to the current average value of each subarea of the LED backlight;
determining whether the maximum current average value is greater than a preset current frame voltage extreme value;
if the maximum current average value is less than or equal to a preset current frame voltage extreme value, judging whether the timing time reaches a preset time threshold value, wherein the preset time threshold value is greater than the preset time length;
when the timing time does not reach the preset time threshold value, increasing the preset time length, and returning to the execution step: acquiring the current average value of each partition of the LED backlight within a preset time;
and if the maximum current average value is larger than the preset current frame voltage extreme value, setting the current of each subarea of the LED backlight as the preset safe current.
2. The LED current protection method according to claim 1, wherein the step of obtaining the maximum average current value in all the partitions according to the average current value of each partition of the LED backlight comprises:
determining whether the maximum current average value is larger than a preset current frame voltage threshold value;
and if the maximum current average value is larger than a preset current frame voltage threshold value, acquiring a preset current frame voltage extreme value, wherein the preset current frame voltage extreme value is larger than the preset current frame voltage threshold value.
3. The LED current protection method of claim 2, wherein said step of determining whether said maximum current average is greater than a preset current frame voltage threshold is followed by:
if the maximum current average value is less than or equal to a preset current frame voltage threshold value, returning to the execution step: and acquiring the current average value of each partition of the LED backlight within a preset time.
4. The LED current protection method of claim 2, wherein said step of determining whether the timed time reaches a predetermined time threshold is followed by:
when the timing time reaches a preset time threshold, judging whether the maximum current average value is greater than a preset current final value, wherein the preset current final value is greater than a preset current frame voltage threshold;
if the maximum current average value is less than or equal to a preset current final value, returning to the execution step: starting timing, and acquiring the current average value of each partition of the LED backlight in the preset time when the timing time reaches the preset time;
and if the maximum current average value is larger than the preset current final value, setting the current of each subarea of the LED backlight as the preset safe current.
5. The LED current protection method according to any one of claims 1 to 4, wherein the step of setting the current of each section of the LED backlight to a preset safe current comprises:
reducing the Pulse Width Modulation (PWM) duty ratio of each partition current of the LED backlight to set each partition current of the LED backlight to be a preset safe current;
and keeping the current of each subarea of the LED backlight at the preset safe current within the preset current reduction duration.
6. The LED current protection method according to claim 5, wherein the step of maintaining the current of each section of the LED backlight at the preset safe current for the preset current reduction period comprises the following steps:
when the preset current reduction duration is reached, improving the PWM duty ratio of the current of each partition of the LED backlight to recover the current of each partition of the LED backlight, and executing the following steps: and acquiring the current average value of each partition of the LED backlight within a preset time.
7. A display, comprising a memory, a processor, and an LED current protection program stored on the memory and executable on the processor, wherein: the LED current protection program when executed by the processor implements the steps of the LED current protection method of any one of claims 1 to 6.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a LED current protection program, which when executed by a processor implements the steps of the LED current protection method according to any one of claims 1 to 6.
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