CN107845369B - A kind of dynamic adjusting method and system of LED backlight brightness - Google Patents
A kind of dynamic adjusting method and system of LED backlight brightness Download PDFInfo
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- CN107845369B CN107845369B CN201711146649.4A CN201711146649A CN107845369B CN 107845369 B CN107845369 B CN 107845369B CN 201711146649 A CN201711146649 A CN 201711146649A CN 107845369 B CN107845369 B CN 107845369B
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The present invention discloses the dynamic adjusting method and system of a kind of LED backlight brightness, this method comprises: test obtains the fixed position in LED backlight edge and center brightness value under different brightness degrees, calculates brightness mapping-factor；Fixed position brightness value is acquired, center brightness value is calculated according to brightness mapping-factor；Judge whether the difference of center brightness value and target brightness value exceeds allowable error range, otherwise continue to acquire, be, according to scale factor calculation compensation current and compensates；Continue to acquire fixed position brightness value and judges whether exceed allowable error range with the difference of target brightness value after calculating center brightness value, otherwise continue to acquire, it is that scale factor is increased or reduced according to the first adjustment factor or the second adjustment factor, compensation current is recalculated using scale factor adjusted and compensates；The process of iteration adjustment scale factor is until meet allowable error range.The quick dynamic equilibrium of LED backlight brightness can be achieved in the present invention.
Description
Technical field
The present invention relates to technical field of liquid crystal display.More particularly, to a kind of dynamic adjustment side of LED backlight brightness
Method and system.
Background technique
LED backlight is widely used in field of liquid crystal panel display, is most important light source, LED backlight in liquid crystal display
The performance in source directly determines the quality of liquid crystal display.Compared to traditional CCFL backlight, LED backlight possesses light emission luminance
The advantages that height, excitation purity, light angle are big, stable, environmentally friendly, the service life is long.
LED backlight is made of several layers of very thin doped semiconductor materials, wherein one layer has excessive electronics, another layer
Then lack electronics and form positively charged hole, when work drives current through, and electrons and holes be combined with each other, extra energy
It is then released in the form of light radiation, the size of driving current finally affects LED illumination brightness and coloration.
LED backlight after long-term use, especially in ageing environment after use, is inevitably present brightness and declines
Subtract, the negative effect such as color temperature change, especially LED backlight brightness decay can generate the identifiable colour cast of naked eyes, seriously affect
The quality of liquid crystal display.
Some modes that LED backlight driving current is adjusted according to the brightness value of actual measurement are currently, there are, but existing
That there are brightness acquisition precisions is low for regulative mode, adjustment speed is slowly (when changing brightness value every time and needing to wait longer balance
Between), brightness flicker, brightness (can not be jumped back and forth at target brightness value edge) and the problems such as stablize, introduce herein a kind of fast
Fast adjusting method, emphasis solve following technical problem:
Accordingly, it is desirable to provide a kind of dynamic of the LED backlight brightness of the achievable quick dynamic equilibrium of LED backlight brightness
Method of adjustment and system.
Summary of the invention
The purpose of the present invention is to provide a kind of LED backlight of achievable quick dynamic equilibrium of LED backlight brightness is bright
The dynamic adjusting method and system of degree.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
The present invention discloses a kind of dynamic adjusting method of LED backlight brightness, comprising:
S1, under different brightness degrees, according to the brightness value L for the fixed position in LED backlight edge that test obtainsEiWith
The brightness value L of LED backlight centerCi, calculate the brightness mapping-factor of each brightness degree: Ki=LCi/LEi；
S2, acquisition LED backlight edge fix the present intensity value of position, according to LED backlight edge fixed bit
The brightness mapping-factor of the brightness degree of the present intensity value and current setting set calculates the current bright of LED backlight center
Angle value；
S3, that whether the difference for judging between the present intensity value of LED backlight center and target brightness value exceeds is fair
Perhaps error range:
If being otherwise transferred to step S2；
If then according to difference and scale factor calculation compensation current, and according to compensation current to LED backlight
Driving current compensates, and is transferred to step S4；
S4, the compensated LED backlight edge of acquisition fix the present intensity value of position, are carried on the back according to compensated LED
The brightness mapping-factor of the brightness degree of the present intensity value and current setting of fixed position calculates compensated at light source edge
The present intensity value of LED backlight center；
S5, judge that the difference between the present intensity value and target brightness value of compensated LED backlight center is
The no error range beyond permission:
If being otherwise transferred to step S4；
And if the present intensity value of compensated LED backlight center be less than target brightness value, then according to difference
With the first adjustment factor adjustment proportional factor, using scale factor adjusted as new scale factor, according to difference and ratio
The factor calculates compensation current and is compensated according to driving current of the compensation current to LED backlight, is transferred to step S4；
And if the present intensity value of compensated LED backlight center be greater than target brightness value, then according to difference
With second adjustment factor adjustment proportional factor, using scale factor adjusted as new scale factor, according to difference and ratio
The factor calculates compensation current and is compensated according to driving current of the compensation current to LED backlight, is transferred to step S4.
Preferably, in this method, the formula of compensation current is calculated are as follows: △ I=(LS- LCr) × P, △ I are compensation electric current
Value, P is scale factor, LSFor target brightness value, LCrFor the present intensity value of LED backlight center.
Preferably, in this method,
The formula according to difference and the first adjustment factor adjustment proportional factor are as follows:
P`=P × 1.1+ (LS- LCr) × α, α are the first adjustment factor, and P` is scale factor adjusted, LSFor target
Brightness value, LCrFor the present intensity value of LED backlight center；
The formula according to difference and second adjustment factor adjustment proportional factor are as follows:
P`=P × 0.9+ (LS- LCr) × β, β are the second adjustment factor.
Preferably, in this method,
The present intensity value for acquiring the fixed position of LED backlight or compensated LED backlight edge includes: with fixation
Time interval acquires the brightness value of the fixed position of LED backlight or compensated LED backlight edge, is adopted according to continuously multiple
The mean value of the brightness value of the fixed position of the LED backlight of collection or compensated LED backlight edge is as LED backlight or benefit
The present intensity value of the fixed position in LED backlight edge after repaying.
Preferably, in this method, the multiple is 10.
Invention additionally discloses a kind of dynamic debugging systems of LED backlight brightness, comprising: luminance test instrument, computing module,
Memory module, luminance sensor, judgment module and compensating module；
The luminance test instrument, test obtains the fixed position in LED backlight edge or LED back under different brightness degrees
The brightness value of light source center position；
The computing module, according to from the fixed position in the LED backlight edge of the luminance test instrument and LED backlight
The brightness value of source center calculates the brightness mapping-factor of the edge fixed position and center of different brightness degrees；
The memory module, store the brightness mapping of the fixed position in edge and center of different brightness degrees because
Son；
The luminance sensor, the present intensity value of the fixed position in acquisition LED backlight edge；
The computing module, also according to the current of the fixed position in the LED backlight edge from the luminance sensor
Brightness value and the brightness mapping-factor calculating LED backlight read from the memory module according to the brightness degree of current setting
The present intensity value of center；
The judgment module, it is bright according to the present intensity value of the LED backlight center from computing module and target
The relationship of angle value exports compensating instruction；
The computing module, also based on the compensating instruction from the judgment module, according to LED backlight center
The difference and scale factor calculation compensation current of present intensity value and target brightness value；
The compensating module, according to the compensation current from the computing module to the driving current of LED backlight into
Row compensation；
The computing module, also according to the compensated LED backlight edge fixed bit from the luminance sensor
The present intensity value set and the brightness mapping-factor calculating benefit read according to the brightness degree of current setting by the memory module
The present intensity value of LED backlight center after repaying；
The judgment module, also according to the present intensity of the compensated LED backlight center from computing module
The relationship of value and target brightness value, the instruction of output adjustment scale factor；
The computing module, also based on the adjustment proportional factor instruction from the judgment module, according to compensated LED
The present intensity value of backlight center and the difference of target brightness value and the first adjustment factor or the second adjustment factor adjust
Scale factor, and using scale factor adjusted as new scale factor calculation compensation current.
Preferably, in the system, the computing module calculates the formula of compensation current are as follows: △ I=(LS- LCr) × P,
△ I is compensation current, and P is scale factor, LSFor target brightness value, LCrFor the present intensity value of LED backlight center.
Preferably, in the system, the computing module is according to the formula of difference and the first adjustment factor adjustment proportional factor
Are as follows:
P`=P × 1.1+ (LS- LCr) × α, α are the first adjustment factor, and P` is scale factor adjusted, LSFor target
Brightness value, LCrFor the present intensity value of LED backlight center；
The computing module is according to the formula of difference and second adjustment factor adjustment proportional factor are as follows:
P`=P × 0.9+ (LS- LCr) × β, β are the second adjustment factor.
Beneficial effects of the present invention are as follows:
Technical solution of the present invention does not need to manually adjust, and can realize the quick dynamic equilibrium of LED backlight brightness automatically；
The brightness of LED backlight, which can be realized to adjust in 5s, stablizes, and can realize in 2s and adjust when intrinsic brilliance value is close with target brightness value
Section is stablized；It, can be bright with infinite approach target in intrinsic brilliance value in the case where not considering that driving circuit staged adjusts error
Angle value.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Fig. 1 shows the flow chart of the dynamic adjusting method of LED backlight brightness.
Fig. 2 shows the nonlinear curve figures of acquisition brightness value.
Fig. 3 shows the nonlinear curve figure of LED drive current and brightness value.
Fig. 4 shows the schematic diagram of the dynamic debugging system of LED backlight brightness.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, the dynamic adjusting method of LED backlight brightness provided in this embodiment, comprising:
S1, under different brightness degrees, according to the brightness value L for the fixed position in LED backlight edge that test obtainsEiWith
The brightness value L of LED backlight centerCi, calculate the brightness mapping-factor of each brightness degree: Ki=LCi/LEi, KiIt is i-th
The brightness mapping-factor of brightness degree；
S2, acquisition LED backlight edge fix the present intensity value L of positionEr, fixed according to LED backlight edge
The present intensity value L of positionErWorking as LED backlight center is calculated with the brightness mapping-factor of the brightness degree of current setting
Preceding brightness value LCr；
S3, the present intensity value L for judging LED backlight centerCrWith target brightness value LSBetween difference whether surpass
The error range (error range of the permission is set according to intrinsic brilliance value accuracy requirement) allowed out:
If the present intensity value L of LED backlight centerCrWith target brightness value LSBetween difference without departing from permission
Error range is then transferred to step S2；
If the present intensity value L of LED backlight centerCrWith target brightness value LSBetween difference beyond allow mistake
Poor range then calculates compensation current △ I according to difference and scale factor P, and formula in the specific implementation is △ I=(LS?
LCr) × P, wherein the unit of scale factor P is mAm2/cd；And according to compensation current △ I to the driving electricity of LED backlight
Stream compensates, and is transferred to step S4；
S4, the compensated LED backlight edge of acquisition fix the present intensity value L of positionEr, according to compensated LED
The present intensity value L of the fixed position in backlight edgeErCompensation is calculated with the brightness mapping-factor of the brightness degree of current setting
The present intensity value L of LED backlight center afterwardsCr；
S5, the present intensity value L for judging compensated LED backlight centerCrWith target brightness value LSBetween difference
Whether value is beyond the error range allowed:
If the present intensity value L of compensated LED backlight centerCrWith target brightness value LSBetween difference do not surpass
The error range allowed out is then transferred to step S4；
If the present intensity value L of compensated LED backlight centerCrWith target brightness value LSBetween difference exceed
The present intensity value L of the error range of permission and compensated LED backlight centerCrLess than target brightness value LS, explanation
The scale factor P of current setting is too small, then according to difference and the first adjustment factor-alpha adjustment proportional factor P, in the specific implementation
Formula is P`=P × 1.1+ (LS- LCr) × α, α are the first adjustment factor, and P` is scale factor adjusted；It will be adjusted
Scale factor P` calculates compensation current as new scale factor P, according to difference and scale factor P, in the specific implementation
Formula is △ I=(LS- LCr)×P；And compensated according to driving current of the compensation current to LED backlight, it is transferred to step
S4；
If the present intensity value L of compensated LED backlight centerCrWith target brightness value LSBetween difference exceed
The present intensity value L of the error range of permission and compensated LED backlight centerCrGreater than target brightness value LS, explanation
The scale factor P of current setting is too big, then according to difference and second adjustment factor-beta adjustment proportional factor P, in the specific implementation
Formula is P`=P × 0.9+ (LS- LCr) × β, β are the second adjustment factor, and P` is scale factor adjusted；It will be adjusted
Scale factor P` calculates compensation current as new scale factor P, according to difference and scale factor P, in the specific implementation
Formula is △ I=(LS- LCr)×P；And compensated according to driving current of the compensation current to LED backlight, it is transferred to step
S4。
Since under the effect of identical driving current, the brightness value of all LED lamp beads be can not achieve completely in LED backlight
Identical, therefore, the dynamic adjusting method of LED backlight brightness provided in this embodiment is using the bright of LED backlight center
Brightness value of the angle value as LED backlight.But LED backlight center is directly acquired in the course of work of LED backlight
Brightness value liquid crystal display can be affected greatly, therefore, in order to minimize influence of the acquisition brightness value to liquid crystal display,
The dynamic adjusting method of LED backlight brightness provided in this embodiment in factory test phase using luminance test instrument by being acquired
The brightness value of the fixed position in LED backlight edge and the brightness value of LED backlight center and the brightness both calculated is reflected
Penetrate the factor；In the course of work of LED backlight, the bright of the fixed position in luminance sensor acquisition LED backlight edge is utilized
Angle value and in such a way that the brightness value of LED backlight center is calculated in brightness mapping-factor.In addition, since brightness passes
Sensor is as there are nonlinearity erron as shown in Figure 2, the driving currents and intrinsic brilliance of LED backlight for the difference of brightness degree
There are nonlinearity errons as shown in Figure 3 for value, therefore the dynamic adjusting method of LED backlight brightness provided in this embodiment uses
Different brightness degrees are calculated separately with the mode of brightness mapping-factor.
In the dynamic adjusting method of LED backlight brightness provided in this embodiment, the initial value of scale factor P determines bright
Spend the speed adjusted.The first adjustment factor-alpha and second adjustment factor-beta determine the speed that optimal value is found in entire equilibrium process
Degree, the too small of setting can make adjustment speed slow, and setting, which will lead to greatly very much, is not achieved stabilization.It is necessary to set suitable ratio
The value of factor P, the first adjustment factor-alpha and second adjustment factor-beta.It is dynamic based on LED backlight brightness provided in this embodiment
State method of adjustment can rapidly be adjusted the brightness value of LED backlight into the error range of the permission in target brightness value,
Such as 0.1% error range in.
In the specific implementation, in the dynamic adjusting method of LED backlight brightness provided in this embodiment, LED backlight is acquired
The present intensity value of the fixed position in source or compensated LED backlight edge includes: to acquire LED backlight with Fixed Time Interval
The brightness value of the fixed position in source or compensated LED backlight edge, according to the LED backlight or compensation of continuous multiple acquisitions
The mean value of the brightness value of the fixed position in LED backlight edge afterwards is as LED backlight or compensated LED backlight edge
Locate the present intensity value of fixed position.In the specific implementation, multiple is 10, i.e., acquires LED backlight with Fixed Time Interval
Or the brightness value of the fixed position in compensated LED backlight edge, after the LED backlight or compensation of continuous 10 acquisitions
The fixed position in LED backlight edge brightness value mean value as LED backlight or compensated LED backlight edge
The present intensity value of fixed position.The accuracy of the present intensity value of acquisition can be improved in this way.
As shown in figure 4, the dynamic debugging system of LED backlight brightness provided in this embodiment, comprising: luminance test instrument,
Computing module, memory module, luminance sensor, judgment module and compensating module；
Luminance test instrument, test obtains the brightness value L of the fixed position in LED backlight edge under different brightness degreesEi
Or the brightness value L of LED backlight centerCi；
Computing module, according to the brightness value L of the fixed position in the LED backlight edge from luminance test instrumentEiIt is carried on the back with LED
The brightness value L of light source center positionCiCalculate the brightness mapping of the fixed position in edge and center of different brightness degrees because
Son, calculation formula are as follows: Ki=LCi/LEi, KiFor the brightness mapping-factor of i-th of brightness degree；
Memory module stores the brightness mapping-factor of the edge fixed position and center of different brightness degrees；It can
Understanding, memory module can be the local memory device or expanding storage apparatus integrated, such as: pluggable storage card,
The present embodiment is not especially limited this；
Luminance sensor, the present intensity value L of the fixed position in acquisition LED backlight edgeEr；
Computing module, also according to the present intensity value L of the fixed position in the LED backlight edge from luminance sensorEr
The brightness mapping-factor read from memory module with the brightness degree according to current setting calculates LED backlight center
Present intensity value LCr；
Judgment module, according to the present intensity value L of the LED backlight center from computing moduleCrWith object brightness
Value LSRelationship (error range whether difference exceeds permission), export compensating instruction；
Computing module, also based on the compensating instruction from judgment module, according to the present intensity of LED backlight center
Value LCrWith target brightness value LSDifference and scale factor calculation compensation current △ I, calculation formula in the specific implementation be
△ I=(LS- LCr) × P, wherein the unit of scale factor P is mAm2/cd；
Compensating module mends the driving current of LED backlight according to the compensation current △ I from computing module
It repays；
Computing module, also according to the current of the fixed position in the compensated LED backlight edge from luminance sensor
Brightness value LErCompensated LED is calculated by the brightness mapping-factor that memory module is read with the brightness degree according to current setting to carry on the back
The present intensity value L of light source center positionCr；
Judgment module, also according to the present intensity value L of the compensated LED backlight center from computing moduleCr
With target brightness value LSRelationship (error range whether difference exceeds permission), output adjustment scale factor instruction；
Computing module, also based on the adjustment proportional factor instruction from judgment module, according in compensated LED backlight
The present intensity value L of heart positionCrWith target brightness value LSDifference and the first adjustment factor-alpha or second adjustment factor-beta adjust ratio
Example factor P, and compensation current is calculated using scale factor P` adjusted as new scale factor P.In the specific implementation, if
The present intensity value L of compensated LED backlight centerCrWith target brightness value LSBetween difference beyond allow error
The present intensity value L of range and compensated LED backlight centerCrLess than target brightness value LS, illustrate current setting
Scale factor P is too small, and computing module is according to difference and the first adjustment factor-alpha adjustment proportional factor P:P`=P × 1.1+ (LS?
LCr) × α, α are the first adjustment factor, and P` is scale factor adjusted.If compensated LED backlight center is current
Brightness value LCrWith target brightness value LSBetween difference beyond allow error range and compensated LED backlight center
Present intensity value LCrGreater than target brightness value LS, illustrate that the scale factor P of current setting is too big, computing module according to difference and
Second adjustment factor-beta adjustment proportional factor P:P`=P × 0.9+ (LS- LCr) × β, β are the second adjustment factor, and P` is after adjusting
Scale factor.
In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term " on ", "lower" is base
In orientation or positional relationship shown in the drawings, it is merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion
Signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this
The limitation of invention.Unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " shall be understood in a broad sense, example
Such as, it may be fixed connection or may be dismantle connection, or integral connection；It can be mechanical connection, be also possible to be electrically connected
It connects；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
It should also be noted that, in the description of the present invention, relational terms such as first and second and the like are only used
Distinguish one entity or operation from another entity or operation, without necessarily requiring or implying these entities or
There are any actual relationship or orders between operation.Moreover, the terms "include", "comprise" or its any other change
Body is intended to non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wrapped
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that equipment is intrinsic.In the absence of more restrictions, the element limited by sentence "including a ...", and
It is not excluded in process, method, article or equipment in the process, method, article or apparatus that includes the element that there is also other identical elements.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention for those of ordinary skill in the art on the basis of the above description can be with
It makes other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to the present invention
The obvious changes or variations extended out of technical solution still in the scope of protection of the present invention.
Claims (6)
1. a kind of dynamic adjusting method of LED backlight brightness characterized by comprising
S1, under different brightness degrees, according to the brightness value L for the fixed position in LED backlight edge that test obtainsEiAnd LED
The brightness value L of backlight centerCi, calculate the brightness mapping-factor of each brightness degree: Ki=LCi/LEi；
S2, acquisition LED backlight edge fix the present intensity value of position, according to the fixed position in LED backlight edge
The brightness mapping-factor of the brightness degree of present intensity value and current setting calculates the present intensity of LED backlight center
Value；
S3, judge whether the difference between the present intensity value of LED backlight center and target brightness value exceeds permission
Error range:
If being otherwise transferred to step S2；
If then according to difference and scale factor calculation compensation current, and the driving according to compensation current to LED backlight
Electric current compensates, and is transferred to step S4；
S4, the compensated LED backlight edge of acquisition fix the present intensity value of position, according to compensated LED backlight
The brightness mapping-factor of the brightness degree of the present intensity value and current setting of the fixed position in edge calculates compensated LED back
The present intensity value of light source center position；
S5, judge whether the difference between the present intensity value and target brightness value of compensated LED backlight center surpasses
The error range allowed out:
If being otherwise transferred to step S4；
And if the present intensity value of compensated LED backlight center is less than target brightness value, then according to difference and the
One Dynamic gene adjustment proportional factor, using scale factor adjusted as new scale factor, according to difference and scale factor
It calculates compensation current and is compensated according to driving current of the compensation current to LED backlight, be transferred to step S4；
And if the present intensity value of compensated LED backlight center is greater than target brightness value, then according to difference and the
Two Dynamic gene adjustment proportional factors, using scale factor adjusted as new scale factor, according to difference and scale factor
It calculates compensation current and is compensated according to driving current of the compensation current to LED backlight, be transferred to step S4；
The formula according to difference and the first adjustment factor adjustment proportional factor are as follows:
P`=P × 1.1+ (LS- LCr) × α, α are the first adjustment factor, and P is scale factor, and P` is scale factor adjusted, LS
For target brightness value, LCrFor the present intensity value of LED backlight center；
The formula according to difference and second adjustment factor adjustment proportional factor are as follows:
P`=P × 0.9+ (LS- LCr) × β, β are the second adjustment factor.
2. the dynamic adjusting method of LED backlight brightness according to claim 1, which is characterized in that calculate compensation electric current
The formula of value are as follows: △ I=(LS- LCr) × P, △ I are compensation current, LSFor target brightness value, LCrFor LED backlight center
The present intensity value of position.
3. the dynamic adjusting method of LED backlight brightness according to claim 1, which is characterized in that
The present intensity value for acquiring the fixed position of LED backlight or compensated LED backlight edge includes: with the set time
The brightness value of the fixed position of interval acquisition LED backlight or compensated LED backlight edge, according to continuous multiple acquisitions
After the mean value of the brightness value of the fixed position of LED backlight or compensated LED backlight edge is as LED backlight or compensation
The fixed position in LED backlight edge present intensity value.
4. the dynamic adjusting method of LED backlight brightness according to claim 3, which is characterized in that the multiple is 10
It is a.
5. a kind of dynamic debugging system of LED backlight brightness characterized by comprising luminance test instrument, is deposited computing module
Store up module, luminance sensor, judgment module and compensating module；
The luminance test instrument, test obtains the fixed position in LED backlight edge or LED backlight under different brightness degrees
The brightness value of center；
The computing module, according in the fixed position in the LED backlight edge of the luminance test instrument and LED backlight
The brightness value of heart position calculates the brightness mapping-factor of the edge fixed position and center of different brightness degrees；
The memory module stores the brightness mapping-factor of the edge fixed position and center of different brightness degrees；
The luminance sensor, the present intensity value of the fixed position in acquisition LED backlight edge；
The computing module, also according to the present intensity of the fixed position in the LED backlight edge from the luminance sensor
Value and the brightness mapping-factor calculating LED backlight center read from the memory module according to the brightness degree of current setting
The present intensity value of position；
The judgment module, according to the present intensity value and target brightness value of the LED backlight center from computing module
Relationship, export compensating instruction；
The computing module, also based on the compensating instruction from the judgment module, according to the current of LED backlight center
The difference and scale factor calculation compensation current of brightness value and target brightness value；
The compensating module is mended according to driving current of the compensation current from the computing module to LED backlight
It repays；
The computing module, also according to the fixed position in the compensated LED backlight edge from the luminance sensor
Present intensity value and after calculating compensation by the brightness mapping-factor that the memory module is read according to the brightness degree of current setting
LED backlight center present intensity value；
The judgment module, also according to the compensated LED backlight center from computing module present intensity value with
The relationship of target brightness value, the instruction of output adjustment scale factor；
The computing module, also based on the adjustment proportional factor instruction from the judgment module, according to compensated LED backlight
The present intensity value of source center and the difference of target brightness value and the first adjustment factor or the second adjustment factor adjust ratio
The factor, and using scale factor adjusted as new scale factor calculation compensation current, wherein it is adjusted according to difference and first
The formula of integral divisor adjustment proportional factor are as follows: P`=P × 1.1+ (LS- LCr) × α, α be the first adjustment factor, P be ratio because
Son, P` are scale factor adjusted, LSFor target brightness value, LCrFor the present intensity value of LED backlight center；According to
The formula of difference and second adjustment factor adjustment proportional factor are as follows: P`=P × 0.9+ (LS- LCr) × β, β be second adjustment because
Son.
6. the dynamic debugging system of LED backlight brightness according to claim 5, which is characterized in that the computing module
Calculate the formula of compensation current are as follows: △ I=(LS- LCr) × P, △ I are compensation current, LSFor target brightness value, LCrFor
The present intensity value of LED backlight center.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711146649.4A CN107845369B (en) | 2017-11-17 | 2017-11-17 | A kind of dynamic adjusting method and system of LED backlight brightness |
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| CN108648697A (en) * | 2018-03-30 | 2018-10-12 | 中兴通讯股份有限公司 | Screen intensity calibration method, apparatus and system, computer readable storage medium |
| CN109979401B (en) * | 2019-05-06 | 2021-01-08 | 京东方科技集团股份有限公司 | Driving method, driving apparatus, display device, and computer readable medium |
| CN111816121B (en) * | 2020-07-07 | 2021-11-05 | 合肥维信诺科技有限公司 | Display panel brightness compensation method and system and display panel |
| CN113284469B (en) * | 2021-05-26 | 2022-09-09 | 深圳市华星光电半导体显示技术有限公司 | Brightness adjusting method, brightness adjusting device and electronic equipment |
| CN113442439B (en) * | 2021-07-01 | 2022-05-13 | 浙江闪铸三维科技有限公司 | Intelligent control method for light intensity in 3D printer |
| CN115762404B (en) * | 2023-01-10 | 2023-04-07 | 禹创半导体(深圳)有限公司 | DBV remapping method and device for OLED dimming and OLED display equipment |
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