CN109256095A - LED current guard method, display and storage medium - Google Patents
LED current guard method, display and storage medium Download PDFInfo
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- CN109256095A CN109256095A CN201811248428.2A CN201811248428A CN109256095A CN 109256095 A CN109256095 A CN 109256095A CN 201811248428 A CN201811248428 A CN 201811248428A CN 109256095 A CN109256095 A CN 109256095A
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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
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- 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
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- 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]
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Abstract
The invention discloses a kind of LED current guard method, display and storage mediums, comprising the following steps: obtains the current average of each subregion of LED backlight in preset duration；According to the current average of each subregion of the LED backlight, the maximum current average value in all subregions is obtained；Determine whether the maximum current average value is greater than predetermined current frame pressure extreme value；If the maximum current average value, which is greater than predetermined current frame, presses extreme value, the electric current of each subregion of LED backlight is set to default safe current.The present invention can monitor the current average of each subregion of LED backlight, and the electric current of adjustment each subregion of LED backlight enhances the safety of LED backlight to improve the service life of LED while guaranteeing display effect when maximum current average value is excessively high.
Description
Technical field
The present invention relates to field of display more particularly to a kind of LED current guard methods, display and storage medium.
Background technique
With the fast development of LCD technology, the resolution ratio of liquid crystal display is higher and higher, the figure that can be realized
As Display Processing Technology is also more and more.In the prior art, LED (Light Emitting Diode, light-emitting diodes are utilized
Pipe) it is widely used in liquid crystal display as backlight.Wherein, LED can pass through local dimming boost function
LED backlight is adjusted, greatly to promote the contrast of display picture.The local dimming boost function is
It is the electric current by controlling multiple LED backlight subregions, realizes the local modulation of LED backlight.
When adjusting the electric current of each subregion of LED backlight, with the increase of contrast, the electric current for flowing through LED also mentions therewith
It rises, and LED is maintained in the biggish situation of electric current easily leads to that LED is heating up for a long time, influences in the service life of LED, also to easily lead to
LED crosses cause thermal damage.Therefore, how to make LED can reduce electric current in the case where larger current, avoid generation time decaying and
Security risk becomes current urgent problem to be solved.
Summary of the invention
The main purpose of the present invention is to provide a kind of LED current guard method, display and storage mediums, it is intended to monitor
With the electric current of adjustment LED backlight, avoid electric current excessively high and the LED life decaying generated and security hidden trouble.
To achieve the above object, the present invention provides a kind of LED current guard method, and the LED current guard method includes
Following steps:
Obtain the current average of each subregion of LED backlight in preset duration；
According to the current average of each subregion of the LED backlight, the maximum current average value in all subregions is obtained；
Determine whether the maximum current average value is greater than predetermined current frame pressure extreme value；
If the maximum current average value, which is greater than predetermined current frame, presses extreme value, the electric current of each subregion of LED backlight is set to pre-
If safe current.
Optionally, the current average according to each subregion of the LED backlight, obtains the maximum current in all subregions
Include: after the step of average value
Determine whether the maximum current average value is greater than predetermined current frame pressure threshold value；
If the maximum current average value, which is greater than predetermined current frame, presses threshold value, obtains predetermined current frame and press extreme value, wherein institute
It states predetermined current frame pressure extreme value and is greater than predetermined current frame pressure threshold value.
Optionally, the determination maximum current average value wraps after whether being greater than the step of predetermined current frame pressure threshold value
It includes:
If the maximum current average value, which is less than or equal to predetermined current frame, presses threshold value, return to step: obtaining default
The current average of each subregion of LED backlight in duration.
Optionally, the determination maximum current average value wraps after whether being greater than the step of predetermined current frame pressure extreme value
It includes:
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, increase preset duration, and execute step
It is rapid: to obtain the current average of each subregion of LED backlight in preset duration.
Optionally, described the step of obtaining the current average of each subregion of LED backlight in preset duration, includes:
Start timing, and obtains the electric current of each subregion of LED backlight in preset duration when timing time reaches preset duration
Average value；
Before the step of increase preset duration further include:
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, judge whether timing time reaches pre-
If time threshold, wherein the preset time threshold is greater than the preset duration；
When the timing time is not up to preset time threshold, the step of increasing preset duration is executed.
Optionally, described to judge include: after the step of whether timing time reaches preset time threshold
When the timing time reaches preset time threshold, judge whether the maximum current average value is greater than default electricity
Final value is flowed, wherein the predetermined current final value, which is greater than the predetermined current frame, presses threshold value；
If the maximum current average value is less than or equal to predetermined current final value, return to step: starting timing, and
Timing time obtains the current average of each subregion of LED backlight in preset duration when reaching preset duration；
If the maximum current average value is greater than predetermined current final value, the electric current of each subregion of LED backlight is set to default peace
Total current.
Optionally, the step of electric current by each subregion of LED backlight is set to default safe current include:
The PWM duty cycle of each subregion electric current of LED backlight is reduced, each subregion electric current of LED backlight is set to default safety
Electric current；
The electric current of each subregion of LED backlight is maintained at default safe current in default drop flow/time length.
Optionally, described that the electric current of each subregion of LED backlight is maintained at default safe current in default drop flow/time length
Include: after step
After reaching default drop flow/time length, the PWM duty cycle of each subregion electric current of LED backlight is improved, it is each to restore LED backlight
The electric current of subregion, and execute step: obtain the current average of each subregion of LED backlight in preset duration.
In addition, to achieve the above object, the present invention also provides a kind of display, the display includes: memory, processing
Device and it is stored in the LED current protective program that can be run on the memory and on the processor, the LED current protection
Program realizes the step of LED current guard method as described above when being executed by the processor.
In addition, to achieve the above object, it is described computer-readable the present invention also provides a kind of computer readable storage medium
It is stored with LED current protective program on storage medium, is realized when the LED current protective program is executed by processor as described above
LED current guard method the step of.
A kind of LED current guard method, display and the storage medium that the embodiment of the present invention proposes, it is preset by obtaining
The average value of the electric current of each subregion of LED backlight in certain period of time therefrom obtains the maximum LED backlight of current average point
Area, the current average of the subregion are maximum current average value.Maximum current average value and preset current frame are pressed into extreme value
It is compared, when maximum current average value is greater than predetermined current frame pressure extreme value, then judges that the electric current of LED backlight at this time is excessive,
By the current reduction of each subregion of LED backlight to preset safe current.By monitoring the electric current of each subregion of LED backlight, and in electricity
Electric current is adjusted when flowing through big in time, avoids electric current is excessive from leading to the security risks such as LED life is decayed and LED is burnt out, is guaranteeing to show
While showing the image effect of device, the service life of LED is increased.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the hardware running environment that the embodiment of the present invention is related to；
Fig. 2 is the flow diagram of LED current guard method first embodiment of the present invention；
Fig. 3 is the flow diagram of LED current guard method second embodiment of the present invention, 3rd embodiment；
Fig. 4 is the flow diagram of LED current guard method fourth embodiment of the present invention, the 5th embodiment；
Fig. 5 is the refinement flow diagram of step S40 in LED current guard method first embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
As shown in Figure 1, Fig. 1 is the apparatus structure schematic diagram for the hardware running environment that the embodiment of the present invention is related to.
The terminal of that embodiment of the invention can be display, PC (Personal Computer, personal computer) and TV
Machine is also possible to smart phone, tablet computer, E-book reader, MP3 (Moving Picture Experts Group
Audio Layer III, dynamic image expert's compression standard audio level 3) player, MP4 (Moving Picture
Experts Group Audio Layer IV, dynamic image expert's compression standard audio level 4) player, portable computer
Etc. packaged type terminal device having a display function.
As shown in Figure 1, the terminal may include: processor 1001, such as CPU, communication bus 1002, user interface
1003, network interface 1004, memory 1005.Wherein, communication bus 1002 is for realizing the connection communication between these components.
User interface 1003 may include display screen (Display), input unit such as keyboard (Keyboard), optional user interface
1003 can also include standard wireline interface and wireless interface.Network interface 1004 optionally may include that the wired of standard connects
Mouth, wireless interface (such as WI-FI interface).Memory 1005 can be high speed RAM memory, be also possible to stable memory
(non-volatile memory), such as magnetic disk storage.Memory 1005 optionally can also be independently of aforementioned processor
1001 storage device.
Optionally, terminal can also include camera, RF (Radio Frequency, radio frequency) circuit, sensor, audio
Circuit, WiFi module etc..Wherein, sensor such as optical sensor, motion sensor and other sensors.Specifically, light
Sensor may include ambient light sensor and proximity sensor, wherein ambient light sensor can according to the light and shade of ambient light come
The brightness of display screen is adjusted, proximity sensor can close display screen and/or backlight when hardware device is moved in one's ear.As
One kind of motion sensor, gravity accelerometer can detect the size of (generally three axis) acceleration in all directions, quiet
Size and the direction that can detect that gravity when only, the application that can be used to identify hardware device posture are (such as horizontal/vertical screen switching, related
Game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, tap) etc.；Certainly, hardware device can also match
The other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor are set, details are not described herein.
Processor 1001 can be used for calling the LED current protective program stored in memory 1005, and execute following LED
Respectively implement the step in current protection method:
Obtain the current average of each subregion of LED backlight in preset duration；
According to the current average of each subregion of the LED backlight, the maximum current average value in all subregions is obtained；
Determine whether the maximum current average value is greater than predetermined current frame pressure extreme value；
If the maximum current average value, which is greater than predetermined current frame, presses extreme value, the electric current of each subregion of LED backlight is set to pre-
If safe current.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
Determine whether the maximum current average value is greater than predetermined current frame pressure threshold value；
If the maximum current average value, which is greater than predetermined current frame, presses threshold value, obtains predetermined current frame and press extreme value, wherein institute
It states predetermined current frame pressure extreme value and is greater than predetermined current frame pressure threshold value.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
If the maximum current average value, which is less than or equal to predetermined current frame, presses threshold value, return to step: obtaining default
The current average of each subregion of LED backlight in duration.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, increase preset duration, and execute step
It is rapid: to obtain the current average of each subregion of LED backlight in preset duration.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
Start timing, and obtains the electric current of each subregion of LED backlight in preset duration when timing time reaches preset duration
Average value；
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, judge whether timing time reaches pre-
If time threshold, wherein the preset time threshold is greater than the preset duration；
When the timing time is not up to preset time threshold, the step of increasing preset duration is executed.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
When the timing time reaches preset time threshold, judge whether the maximum current average value is greater than default electricity
Final value is flowed, wherein the predetermined current final value, which is greater than the predetermined current frame, presses threshold value；
If the maximum current average value is less than or equal to predetermined current final value, return to step: starting timing, and
Timing time obtains the current average of each subregion of LED backlight in preset duration when reaching preset duration；
If the maximum current average value is greater than predetermined current final value, the electric current of each subregion of LED backlight is set to default peace
Total current.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
The PWM duty cycle of each subregion electric current of LED backlight is reduced, each subregion electric current of LED backlight is set to default safety
Electric current；
The electric current of each subregion of LED backlight is maintained at default safe current in default drop flow/time length.
Further, processor 1001 can be used for calling the LED current protective program stored in memory 1005, also hold
The following operation of row:
After reaching default drop flow/time length, the PWM duty cycle of each subregion electric current of LED backlight is improved, it is each to restore LED backlight
The electric current of subregion, and execute step: obtain the current average of each subregion of LED backlight in preset duration.
It will be understood by those skilled in the art that the restriction of the not structure paired terminal of terminal structure shown in Fig. 1, can wrap
It includes than illustrating more or fewer components, perhaps combines certain components or different component layouts.
Referring to figure 2., Fig. 2 is the flow diagram of LED current guard method first embodiment of the present invention, including walks as follows
It is rapid:
Step S10 obtains the current average of each subregion of LED backlight in preset duration；
In the present embodiment, LED current guard method can be applied to the display terminals such as television terminal and display, can also
To be applied to mobile terminal, it is explained by taking television terminal as an example below.Wherein, television terminal includes liquid crystal display,
And the liquid crystal display uses LED as backlight, while liquid crystal display includes multiple LED backlight subregions, and each LED is carried on the back
Light subregion includes at least a LED.It should be noted that the current duty cycle and electric current of LED backlight subregion are the LED backlight point
The current duty cycle and electric current of each LED in area.
When television terminal passes through LED backlight display image data, each subregion of LED backlight is in operating status and has electric current
Pass through, wherein the size of current that each subregion of LED backlight is passed through is not identical.Television terminal determines a preset duration, statistics
The average value for the electric current that all subregions of LED backlight flow through in preset duration.Wherein, when different LED backlight subregions is due to presetting
Electric current in length is not constantly identical, and the current average for each subregion being finally calculated is not also identical.
It should be noted that the current average of LED refers to that the average value of electric current of each LED in preset duration, LED are each
The current average of subregion refers to the average value of the current average of all LED in preset duration in LED subregion.LED is each
The current average of subregion can also be the average value of total current in preset duration in LED subregion.
Step S20, according to the current average of each subregion of the LED backlight, the maximum current obtained in all subregions is flat
Mean value；
It is flat from the electric current in all subregions after the current average that each subregion of LED backlight is calculated in the present embodiment
The maximum subregion of current average is chosen in mean value, the current average of the subregion is maximum current average value.
Step S30, determines whether the maximum current average value is greater than predetermined current frame pressure extreme value；
In the present embodiment, after obtaining maximum current average value of the LED backlight in preset duration, obtained according to preset duration
Extreme value is pressed to corresponding predetermined current frame.It is preset current values that predetermined current frame, which presses extreme value, in preset duration, if
The maximum current average value of LED backlight reaches the numerical value, then it is assumed that the current stresses at this time in LED backlight are excessive, need to electricity
Stream is limited to protect LED backlight.
If the maximum current average value, which is greater than predetermined current frame, presses extreme value, step S40 is executed, by each subregion of LED backlight
Electric current be set to default safe current.
Maximum current average value of the LED backlight in preset duration is compared with predetermined current frame pressure extreme value, when most
When high current average value is greater than predetermined current frame pressure extreme value, then it represents that in the preset duration, electric current mistake that LED backlight is passed through
Greatly, the service life of LED may be influenced whether, and it is possible to cause the damage of LED backlight.When default due to this in each subregion of LED
The current average of the maximum subregion of current stresses is excessive in long, needs to be default peace by the current reduction in each subregion of LED
Total current protects LED backlight and display to reduce the electric current of LED backlight.
In the present embodiment, when LED backlight is in operating status, the electric current that each subregion of LED backlight flows through not phase
Deng.According to the duration of pre-set monitoring current, statistics calculating is carried out to the electric current of each subregion of LED backlight in the duration,
The current average of each subregion of LED backlight in the duration is obtained, it is flat that electric current is chosen in the current average of each subregion
For the maximum subregion of mean value as electric current maximum subregion, the current average of the subregion is maximum current average value.It will set in advance
Fixed current frame pressure extreme value corresponding with detection electric current duration is compared with maximum current average value, when maximum current is average
Value is more than after preset current frame presses extreme value, and the electric current for determining that LED backlight flows through in this section of duration is excessive, therefore, to LED backlight
The electric current of all subregions is adjusted, so that the current reduction of each subregion is pre-set safe current, in the default peace
Under total current, LED backlight can safely be worked for a long time.
After counting the electric current of each subregion in the LED backlight in certain time length and obtaining current average, if judgement
It was found that the current stresses of LED backlight are excessive at this time, then the electric current of LED backlight is adjusted, at LED backlight long-time
LED is caused to be damaged in the excessively high state of electric current.Can effectively it lead in the state of ensuring that LED backlight works normally
The electric current of adjustment LED backlight is crossed to protect internal LED to improve the service life of LED while guaranteeing display effect.
It further, is the flow diagram of LED current guard method second embodiment of the present invention referring to Fig. 3, Fig. 3,
In the present embodiment, the step S20 obtains the maximum in all subregions according to the current average of each subregion of the LED backlight
Include: after the step of current average
Step S50, determines whether the maximum current average value is greater than predetermined current frame pressure threshold value；
If the maximum current average value, which is greater than predetermined current frame, presses threshold value, step S60 is executed, obtains predetermined current frame pressure
Extreme value, wherein predetermined current frame pressure extreme value is greater than the predetermined current frame and presses threshold value.
In the present embodiment, it after getting the maximum current average value of LED backlight, first obtains predetermined current frame and presses threshold
Value, predetermined current frame pressure threshold value refer to the threshold value of stabling current when LED backlight can be worked for a long time.It is being more than default
When current frame presses threshold value, indicate that the electric current in LED backlight operational process has reached prompting numerical value, if LED backlight continues at this time
It is run under conditions of high current, may result in LED and be damaged.Need further to obtain predetermined current frame pressure pole at this time
Value, in the present solution, the numerical value of predetermined current frame pressure extreme value is greater than the numerical value of predetermined current frame pressure threshold value, when maximum current is average
When value is greater than predetermined current frame pressure threshold value, if maximum current average value presses extreme value also greater than predetermined current frame, then it represents that this is pre-
If duration in LED backlight electric current it is excessively high, need the electric current to each subregion of LED backlight to carry out drop stream.
At runtime, the LED backlight on display is in operating status for television terminal, calculates the electricity of LED backlight first
The average value for flowing each subregion whithin a period of time, when maximum current average value is greater than preset prompting numerical value, i.e. predetermined current
When frame presses threshold value, judge whether maximum current average value is greater than preset warning numerical value, i.e., predetermined current frame presses extreme value.In maximum
Current average is more than after predetermined current frame presses extreme value, to be adjusted to the electric current of LED backlight, to protect LED.
Further, illustrate with continued reference to the process that Fig. 3, Fig. 3 are LED current guard method second embodiment of the present invention
Figure, in the present embodiment, the step S50 determine whether the maximum current average value is greater than predetermined current frame pressure threshold value
Include: after step
If the maximum current average value, which is less than or equal to predetermined current frame, presses threshold value, S10 is returned to step, is obtained pre-
If the current average of each subregion of LED backlight in duration.
In the present embodiment, after the maximum current average value and predetermined current frame for getting LED backlight press threshold value, if most
High current average value is no more than predetermined current frame and presses threshold value, i.e. maximum current average value is less than or equal to predetermined current frame pressure threshold
Value, then it represents that the electric current that LED backlight is flowed through in preset duration is smaller, will not impact, can continue to the use of LED
Keep the operating status of LED.
After the current average of confirmation LED backlight electric current maximum subregion is still no more than preset current frame pressure threshold value,
Preset duration is reacquired, and the electric current for counting each subregion of LED backlight of the calculating in next preset duration is average
Value, to continue the current protection of LED backlight.When confirmation LED average value of electric current in one section of preset duration is less than
After capableing of the current values of long-term stable work, the electricity of the LED backlight subregion in following one section of preset duration is recalculated
Levelling mean value can effectively reduce the collection capacity and calculation amount of data, reduce the operation pressure of the processor inside television terminal
Power.
Further, illustrate with continued reference to the process that Fig. 3, Fig. 3 are LED current guard method 3rd embodiment of the present invention
Figure, in the present embodiment, the step S30 determine whether the maximum current average value is greater than predetermined current frame pressure extreme value
Include: after step
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, S41 is thened follow the steps, is increased default
Duration, and S10 is returned to step, obtain the current average of each subregion of LED backlight in preset duration.
In the present embodiment, it after determining that maximum current average value is greater than predetermined current frame pressure threshold value, gets preset
Current frame presses extreme value, then maximum current average value is compared with predetermined current frame pressure extreme value.It should be noted that in this skill
In art scheme, predetermined current frame pressure threshold value and predetermined current frame pressure extreme value are all pre-set current values, and predetermined current
Frame presses extreme value to be greater than predetermined current frame and presses threshold value.When maximum current average value is less than or equal to predetermined current frame pressure extreme value, table
Show that maximum current average value is pressed between threshold value and predetermined current frame pressure extreme value in predetermined current frame at this time, indicates LED backlight at this time
Electric current maximum subregion current average be more than long-term stable work current values, but not up to need to LED carry on the back
The electric current of light carries out the current values of limitation protection, needs further to be monitored the average current of LED backlight, is to determine
The no electric current to LED backlight carries out limitation protection.By increasing preset duration, counts and calculate in the preset duration after increase
LED backlight maximum current average value, the step of continuing to execute current protection, with can be in the electric current for monitoring LED backlight
The electric current that LED backlight is reduced when excessive, avoids LED from generating damage, extends LED service life.
It further, is the flow diagram of LED current guard method fourth embodiment of the present invention referring to Fig. 4, Fig. 4,
In the present embodiment, the step S10, obtain preset duration in each subregion of LED backlight current average the step of include:
Step S11 starts timing, and each point of LED backlight is obtained in preset duration when timing time reaches preset duration
The current average in area；
Before the step of step S41, increase preset duration further include:
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, step S42 is executed, when judging timing
Between whether reach preset time threshold, wherein the preset time threshold be greater than the preset duration；
When the timing time is not up to preset time threshold, the step of increasing preset duration is executed.
In the present embodiment, after obtaining preset duration, start to carry out timing, during timing, whenever calculating
The maximum current average value of LED backlight out, which is greater than predetermined current frame pressure threshold value and is less than or equal to predetermined current frame, presses extreme value
When, before increasing preset duration, first judge whether timing time reaches time threshold, is not up to preset time in timing time
After threshold value, increases preset duration and continue to obtain current average of each subregion of LED backlight in the preset time period after increase.
Preset time threshold is user's pre-set termination time, when reaching the termination time, even if maximum current is flat
Mean value is pressed still in predetermined current frame in the section of threshold value and predetermined current frame pressure extreme value, does not also continue to increase preset duration simultaneously
Calculate the current average of each subregion of LED backlight in the duration.Since the processor operational capability of terminal is limited, Wu Fa
Arithmetic speed and operation effect are kept during preset time is increased always, need to set a termination time, when timing
Between when not up to terminating the time, just continue to increase preset duration and carry out the electric current of the LED backlight subregion in this section of preset duration
Statistics.
It further, is the flow diagram of the 5th embodiment of LED current guard method of the present invention referring to Fig. 4, Fig. 4,
In the present embodiment, the step S42 judges include: after the step of whether timing time reaches preset time threshold
Step S43 judges whether the maximum current average value is big when the timing time reaches preset time threshold
In predetermined current final value, wherein the predetermined current final value, which is greater than the predetermined current frame, presses threshold value；
If the maximum current average value is less than or equal to predetermined current final value, S11 is returned to step, starts timing,
And the current average of each subregion of LED backlight in preset duration is obtained when timing time reaches preset duration；
If the maximum current average value is greater than predetermined current final value, step S44 is executed, by the electricity of each subregion of LED backlight
Stream is set to default safe current.
In the present embodiment, after timing time reaches preset time threshold, expression arrived at this time terminates the time, is counting
When the time in LED backlight maximum current average value be the maximum subregion of LED current pressure in this time electric current it is flat
Maximum current average value is compared by mean value with predetermined current final value, and similarly, predetermined current final value is pre-set electricity
Fluxion value indicates that the electric current of LED backlight carries out drop stream process because of excessive when timing time reaches and terminates the time
Current minimum, predetermined current final value are greater than predetermined current frame and press threshold value.It is whole to be no more than predetermined current in maximum current average value
When value, expression does not need to carry out drop stream process to the electric current of LED backlight at this time, it is only necessary to reacquire preset duration and is somebody's turn to do
The electric current statistics of LED backlight subregion in section preset duration；And when maximum current average value is more than predetermined current final value, at this time
The current average that LED backlight is flowed through in timing time is excessively high, needs the current reduction of each subregion of LED backlight to default
Safe current within the scope of, to protect LED, improve the safety of LED backlight.
Further, referring to Fig. 5, Fig. 5 is the refinement flow diagram of LED current guard method of the present invention, in this implementation
In example, the step S40, the step of electric current of each subregion of LED backlight is set to default safe current includes:
The PWM duty cycle of each subregion electric current of LED backlight is reduced, each subregion electric current of LED backlight is set to by step S45
Default safe current；
The electric current of each subregion of LED backlight is maintained at default safe current in default drop flow/time length by step S46.
In the present embodiment, the electric current of each subregion of LED backlight is set to default safe current, i.e. adjustment LED backlight
The current reduction of each subregion of LED backlight is default safe current or default safety electricity by the PWM accounting of the electric current of each subregion
Stream hereinafter, and keep the electric current for a period of time, preset drop flow/time length i.e. by the current reduction of LED backlight subregion to it is default safety electricity
The duration of stream.After the electric current for reducing LED backlight, LED backlight is run under lesser electric current, the temperature of each subregion of LED backlight
Degree is also the same to be reduced, and is reached protection LED backlight, is extended the effect of LED life.
Preferably, the PWM duty cycle of the electric current of each subregion of LED backlight can be reduced to the one of original duty ratio
Half, to reduce electric current when LED backlight operation.Default drop flow/time length may be configured as LED backlight and press extreme value more than predetermined current frame
When preset duration.Default drop flow/time length may be arranged as fixed duration, such as 10 minutes.
Further, with continued reference to Fig. 5, in the present embodiment, the step S46 carries on the back LED in default drop flow/time length
Include: after the step of electric current of each subregion of light is maintained at default safe current
Step S47 improves the PWM duty cycle of each subregion electric current of LED backlight after reaching default drop flow/time length, to restore
The electric current of each subregion of LED backlight, and execute step: obtain the current average of each subregion of LED backlight in preset duration.
In the present embodiment, after by the current reduction of LED backlight to default safe current and the default drop flow/time length of holding,
The electric current PWM duty cycle of each subregion of LED backlight is improved, so that when the electric current of LED backlight is restored to television terminal normal operation
The electric current of demand.Continue to obtain preset duration, and count the current average of each subregion of LED backlight in preset duration, LED is carried on the back
The electric current of each subregion of light is monitored and adjusts, to avoid electric current it is excessively high and make LED life decay and generate security risk.
Furthermore the embodiment of the present invention also proposes a kind of computer readable storage medium, is stored thereon with LED current protection journey
Sequence, the storage medium can be the memory 1005 in the terminal of Fig. 1, be also possible to as ROM (Read-Only Memory,
Read-only memory)/RAM (Random Access Memory, random access memory), magnetic disk, at least one of CD, institute
State computer readable storage medium include some instructions use so that one with processor terminal device (can be mobile phone,
Computer, server or television set etc.) execute LED current guard method described in each embodiment of the present invention.
It is understood that in the description of this specification, reference term " embodiment ", " another embodiment ", " other
The description of embodiment " or " first embodiment~N embodiment " etc. means specific spy described in conjunction with this embodiment or example
Sign, structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned
The schematic representation of term may not refer to the same embodiment or example.Moreover, the specific features of description, structure, material
Or feature can be combined in any suitable manner in any one or more of the embodiments or examples.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that terminal device (it can be mobile phone,
Computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of LED current guard method is applied to display, which comprises the following steps:
Obtain the current average of each subregion of LED backlight in preset duration；
According to the current average of each subregion of the LED backlight, the maximum current average value in all subregions is obtained；
Determine whether the maximum current average value is greater than predetermined current frame pressure extreme value；
If the maximum current average value, which is greater than predetermined current frame, presses extreme value, the electric current of each subregion of LED backlight is set to default peace
Total current.
2. LED current guard method as described in claim 1, which is characterized in that described according to each subregion of the LED backlight
Current average includes: after the step of obtaining the maximum current average value in all subregions
Determine whether the maximum current average value is greater than predetermined current frame pressure threshold value；
If the maximum current average value, which is greater than predetermined current frame, presses threshold value, obtains predetermined current frame and press extreme value, wherein described pre-
If current frame presses extreme value to be greater than the predetermined current frame and presses threshold value.
3. LED current guard method as claimed in claim 2, which is characterized in that the determination maximum current average value
Include: after the step of whether being greater than predetermined current frame pressure threshold value
If the maximum current average value, which is less than or equal to predetermined current frame, presses threshold value, return to step: obtaining preset duration
The current average of interior each subregion of LED backlight.
4. LED current guard method as claimed in claim 2, which is characterized in that the determination maximum current average value
Include: after the step of whether being greater than predetermined current frame pressure extreme value
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, increases preset duration, and execute step: obtaining
Take the current average of each subregion of LED backlight in preset duration.
5. LED current guard method as claimed in claim 4, which is characterized in that LED backlight is each in the acquisition preset duration
The step of current average of subregion includes:
Start timing, and the electric current of each subregion of LED backlight is average in acquisition preset duration when timing time reaches preset duration
Value；
Before the step of increase preset duration further include:
If the maximum current average value, which is less than or equal to predetermined current frame, presses extreme value, when judging whether timing time reaches default
Between threshold value, wherein the preset time threshold be greater than the preset duration；
When the timing time is not up to preset time threshold, the step of increasing preset duration is executed.
6. LED current guard method as claimed in claim 5, which is characterized in that described to judge whether timing time reaches pre-
If including: after the step of time threshold
When the timing time reaches preset time threshold, judge whether the maximum current average value is greater than predetermined current end
Value, wherein the predetermined current final value, which is greater than the predetermined current frame, presses threshold value；
If the maximum current average value is less than or equal to predetermined current final value, return to step: starting timing, and in timing
Time obtains the current average of each subregion of LED backlight in preset duration when reaching preset duration；
If the maximum current average value is greater than predetermined current final value, the electric current of each subregion of LED backlight is set to default safety electricity
Stream.
7. LED current guard method as claimed in any one of claims 1 to 6, which is characterized in that described by each subregion of LED backlight
Electric current the step of being set to default safe current include:
The pulse width modulation (PWM) duty ratio of each subregion electric current of LED backlight is reduced, each subregion electric current of LED backlight is set to
Default safe current；
The electric current of each subregion of LED backlight is maintained at default safe current in default drop flow/time length.
8. LED current guard method as claimed in claim 7, which is characterized in that described to carry on the back LED in default drop flow/time length
Include: after the step of electric current of each subregion of light is maintained at default safe current
After reaching default drop flow/time length, the PWM duty cycle of each subregion electric current of LED backlight is improved, to restore each subregion of LED backlight
Electric current, and execute step: obtaining the current average of each subregion of LED backlight in preset duration.
9. a kind of display, which is characterized in that the display includes memory, processor and is stored on the memory simultaneously
The LED current protective program that can be run on the processor, in which: the LED current protective program is held by the processor
It realizes when row such as the step of LED current guard method described in any item of the claim 1 to 8.
10. a kind of computer readable storage medium, which is characterized in that be stored with LED electricity on the computer readable storage medium
Protective program is flowed, is realized when the LED current protective program is executed by processor as described in any item of the claim 1 to 8
The step of LED current guard method.
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