CN104299565B - The low gray scale correction method and system of LED display - Google Patents
The low gray scale correction method and system of LED display Download PDFInfo
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Abstract
The present invention relates to the low gray scale correction method and system of LED display.Methods described includes step：A () control LED display shows the color of multiple GTGs and the color to multiple GTGs carries out data acquisition and distinguishes corresponding multiple brightness measurements at least to obtain multiple GTGs, wherein described color is same primary colours, and multiple GTGs are the part gray-scale being located in the corresponding all GTGs of the primary colours in low grey-scale range；And (b) obtains the corresponding multiple adjustment factors of multiple GTGs at least with the difference between the multiple brightness measurements for obtaining and multiple GTG corresponding brightness target values of difference, and multiple adjustment factors are uploaded to LED display so that LED display changes LED drive current so as to realize the correction to multiple GTGs when the multiple GTG is shown according to multiple adjustment factors.The present invention carries out calibration one by one by low GTG, is capable of achieving LED display current signal linear is responded when low GTG shows.
Description
Technical field
The present invention relates to technical field of LED display, the low gray scale correction method of more particularly to a kind of LED display and
A kind of low gray scale correction system of LED display.
Background technology
Gray scale i.e. so-called GTG, refer to the bright-dark degree of brightness；In LED display industries, every kind of primary colours are refered in particular to
Luminosity.The luminosity of primary colours is divided by intensity size, is exactly gray level.The gray level that LED display can be produced
Higher, the color and image level of display are more.For digitized Display Technique, gray scale is to show determining for number of colors
Determine factor.In general gray scale is higher, and the color of display is abundanter, and picture is also finer and smoother, is more easy to the abundant details of performance.
In digitization system, the ability of gray level control is represented by number of grey levels.So-called number of grey levels is exactly
Finger can be controlled gray level grade number.16 gray scales of rank can be for example controlled, its number of grey levels is just
It is 16.In digital circuit, 16 different numbers are represented with 4bit binary numbers.It can be seen that, for gray level control
Bit quantity is more, and the gray level that can be produced is bigger, and the image for showing is finer and smoother.
Tonal gradation depends primarily on the digital-to-analogue conversion digit of processing system, the video frequency processing chip of certain system, storage
Device and Transmission system are offered to the support of corresponding digit.Current LED display is mainly used：(a) 8 processing systems
System, namely 256 (2 8 powers) level gray scales are simple to understand to be exactly to have 256 kinds of brightness changes to white from black；(b) 10 treatment
System, namely 1024 (2 10 powers) level gray scales are simple to understand to be exactly to have 1024 kinds of brightness changes to white from black；(c) 12
Processing system, namely 4096 (2 12 powers) level gray scales are simple to understand to be exactly to have 4096 kinds of brightness changes to white from black；With
And (d) 14 processing systems, namely 16384 (2 14 powers) level gray scales are simple to understand to be exactly from black to having 16384 kinds in vain
Brightness changes.
In practice, LED display is linear luminescent device, but when electric current pulse width (namely low ash) just
It is not linearly.When electric current pulsewidth is very narrow, the driving chip and LED of LED display to the response of electric current all
Can deviate linear.The discreteness of discreteness, driving chip in addition with LED, the discreteness of LED light axle, mask mass colour
The factors such as discreteness, the inhomogeneities of inside modules heat distribution influence and cause response of the LED display to current signal inclined
Offline property.
The content of the invention
It is the defect and deficiency that overcome prior art to exist, the present invention proposes a kind of low gray scale correction of LED display
The low gray scale correction system of method and a kind of LED display, so that LED display is believed electric current when low GTG is shown
Number linear response.
Specifically, a kind of low gray scale correction method of LED display provided in an embodiment of the present invention, including step：
(S1) control LED display shows the color of multiple GTGs and the color to the multiple GTG carries out data acquisition with least
Obtain the multiple GTG and distinguish corresponding multiple brightness measurements, wherein the color is same primary colours, and the multiple ash
Rank is the part gray-scale that low grey-scale range is located in the corresponding all GTGs of the primary colours；And (b) is at least with the multiple
Difference between brightness measurements multiple brightness target values corresponding with the multiple GTG difference obtains the multiple GTG pair
The multiple adjustment factors answered, and the multiple adjustment factor is uploaded to the LED display for the LED display
LED drive current is changed so as to realize how the multiple GTG according to the multiple adjustment factor when the multiple GTG is shown
Correction.
In one embodiment of the invention, the color of above-mentioned multiple GTGs is sequentially to show.
In one embodiment of the invention, the color of above-mentioned multiple GTGs is that subregion shows simultaneously.
In one embodiment of the invention, above-mentioned steps (b) include：It is utilized respectively the multiple brightness measurements and institute
State the difference between multiple brightness target values and calculate multiple brightness correction coefficients respectively as the multiple adjustment factor.
In one embodiment of the invention, above-mentioned steps (a) include that carrying out data to the color of the multiple GTG adopts
Collection distinguishes corresponding multigroup bright chroma measured value to obtain the multiple GTG, and above-mentioned steps (b) include：It is utilized respectively described
Difference between multigroup bright chroma measured value and the multiple GTG respectively corresponding various bright chroma desired values calculates multiple
Bright chroma correction coefficient is respectively as the multiple adjustment factor；Wherein, each bright chroma correction coefficient is a coefficient square
Battle array.
In one embodiment of the invention, above-mentioned steps (b) include：It is utilized respectively the multiple brightness measurements and institute
State the difference between multiple brightness target values and calculate the corresponding multiple brightness ratios of the multiple GTG difference；And it is sharp respectively
Corresponding multiple gamma values are made with obtaining multiple target gamma values respectively to change the multiple GTG with the multiple brightness ratio
It is the multiple adjustment factor.
In one embodiment of the invention, above-mentioned steps (b) include：It is utilized respectively the multiple brightness measurements and institute
State the difference between multiple brightness target values and calculate the corresponding multiple brightness ratios of the multiple GTG difference；And utilize institute
State corresponding OE width described in the bit of the corresponding binary code of the multiple GTG of multiple brightness ratios modifications many to obtain
Individual target OE width is used as the multiple adjustment factor.
Additionally, a kind of low gray scale correction system of LED display provided in an embodiment of the present invention, including：Display control
Module, data acquisition module, adjustment factor computing module and adjustment factor uploading module.Specifically, display control module is used
In the color for controlling the multiple GTGs of LED display display, wherein the color is same primary colours, and the multiple GTG
To be located at the part gray-scale in low grey-scale range in the corresponding all GTGs of the primary colours.Data acquisition module is used for described many
The color of individual GTG carries out data acquisition and distinguishes corresponding multiple brightness measurements at least to obtain the multiple GTG.Regulation system
Number computing module is used at least with the multiple brightness measurements multiple luma targets corresponding with the multiple GTG difference
Difference between value obtains the corresponding multiple adjustment factors of the multiple GTG.Adjustment factor uploading module is used for will be the multiple
Adjustment factor is uploaded to the LED display, for the LED display show the multiple GTG when according to
Multiple adjustment factors change LED drive current so as to realize the correction to the multiple GTG.
In one embodiment of the invention, above-mentioned adjustment factor computing module specifically for：It is utilized respectively the multiple
Difference between brightness measurements and the multiple brightness target value calculates multiple brightness correction coefficients respectively as described many
Individual adjustment factor.Or, the data acquisition module specifically for the color to the multiple GTG carry out data acquisition with
Obtain the multiple GTG and distinguish corresponding various bright chroma measured values, and the adjustment factor computing module specifically for：
It is utilized respectively the difference between multigroup bright chroma measured value multigroup bright chroma desired value corresponding with the multiple GTG difference
It is different to calculate multiple bright chroma correction coefficient respectively as the multiple adjustment factor；Wherein, each bright chroma correction coefficient
It is a coefficient matrix.
In one embodiment of the invention, above-mentioned adjustment factor computing module specifically for：It is utilized respectively the multiple
Difference between brightness measurements and the multiple brightness target value calculates the multiple GTG and distinguishes corresponding multiple brightness
Ratio, and corresponding multiple gamma values are more to obtain respectively to be utilized respectively the multiple GTG of the multiple brightness ratio modification
Individual target gamma value is used as the multiple adjustment factor.
In one embodiment of the invention, above-mentioned adjustment factor computing module specifically for：It is utilized respectively the multiple
Difference between brightness measurements and the multiple brightness target value calculates the multiple GTG and distinguishes corresponding multiple brightness
Ratio, and change the OE corresponding to the bit of the corresponding binary code of the multiple GTG using the multiple brightness ratio
Width is to obtain multiple target OE width as the multiple adjustment factor.
The embodiment of the present invention is existed by carrying out calibration one by one, achievable LED display such as LED display to low GTG
Current signal linear is responded when low GTG shows, improves the definition and sophistication of LED display picture in low gray scale, energy
Enough solve electric current pulsewidth it is very narrow when, the response of the driving chip and LED of LED display to electric current all can deviated line
The problem of property, and can solve the problem that discreteness, the discreteness of driving chip, the discreteness of LED light axle, the mask due to LED
LED display is to electric current caused by the influences of factor such as discreteness, the inhomogeneities of inside modules heat distribution of mass colour
Response deviates linear problem.
By the detailed description below with reference to accompanying drawing, other side of the invention and feature become obvious.But should know
Road, the accompanying drawing is only the purpose design explained, not as the restriction of the scope of the present invention, because it should refer to
Appended claims.It should also be noted that unless otherwise noted, it is not necessary to scale accompanying drawing, they only try hard to concept
Ground explanation structure described herein and flow.
Brief description of the drawings
Below in conjunction with accompanying drawing, specific embodiment of the invention is described in detail.
Figure 1A and Figure 1B is multiple low GTGs in the low gray scale correction method of the LED display of first embodiment of the invention
Color two kinds of display mode schematic diagrames.
Fig. 2 is the waveform diagram in the low gray scale correction method of the LED display of third embodiment of the invention.
Fig. 3 is a kind of module diagram of the low gray scale correction system of LED display of fourth embodiment of the invention.
Specific embodiment
To enable the above objects, features and advantages of the present invention more obvious understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
【First embodiment】
The technical scheme of the low gray scale correction method of first embodiment of the invention LED display mainly includes two steps
Suddenly：The multiple low GTG is obtained first and distinguishes corresponding multigroup bright chroma measured value, then calculate multiple low GTG difference
Corresponding multiple correction coefficient are as adjustment factor and are uploaded to LED display, so that LED display is when low GTG shows
It is linear to current signal response.In the present embodiment, LED display for example includes the display of LED screen body and electrical connection LED screen body
Control system.Specifically：
During the corresponding multigroup bright chroma measured value of multiple low GTGs difference is obtained：Control LED display first shows
Show the color of multiple low GTGs, the method for display can make that whole screen all shows the color of certain GTG and multiple low GTGs are sequentially
It has been shown that, such as shown in Figure 1A；Can also be the color that multiple low GTGs are once shown using the shape subregion of trellis diagram, for example, scheme
Shown in 1B.After control LED display shows the color of multiple low GTGs, the color of the multiple low GTG to showing is entered respectively
Row data acquisition is obtaining the corresponding bright chroma measured value Lxy of the color of each low GTG.In the present embodiment, the reality of data acquisition
Existing method has various：(1) light tone angle value Lxy is measured again and again by light splitting type colorimeter, precision highest but less efficient；(2)
Light tone angle value Lxy is obtained by the industrial camera of band XYZ filter discs, precision is higher, efficiency is higher, but the industrial phase with XYZ filter discs
Machine is expensive；(3) light tone angle value Lxy is obtained by common color digital camera, first passes through color digital camera and obtain each
The RGB numerical value of LED point, it is XYZ numerical value then to change RGB numerical value, and then obtains light tone angle value Lxy.In the above method (3)
Conversion method can be：Modelling, look-up table (LUT, Look up Table), neural network etc..Wherein, modelling is to pass through
Founding mathematical models, realize the linearly or nonlinearly conversion between RGB=XYZ.For example S-curve models, Masking models,
GOG (Gain-Offset-Gamma) models or multinomial model etc..Look-up table is set up one one-dimensional or three-dimensional (3D-LUT)
Look-up table, look-up table finds out the corresponding relation between RGB=XYZ using interpolation or the algorithm of extrapolation, falls on sampling grid summit
On point value be vertex value, the nearest vertex value around of the point not on summit is obtained by interpolation algorithm.Nerve net
Network method is exactly using the characteristic of artificial neural network nonlinear transformation, it is established that the mapping of RGB=XYZ (positive network) is closed
System, appropriate selection network structure and the spatial distribution of training sample set, can obtain precision higher.
Multiple low GTGs are calculated, corresponding multiple correction coefficient are as adjustment factor respectively and are uploaded to LED display
During：Each low GTG is calculated first and distinguishes corresponding correction coefficient, be then uploaded to correction coefficient as adjustment factor
LED display.
Wherein, calculate each low GTG and distinguish corresponding correction coefficient, two kinds of gamma correction and chromaticity correction can be divided into：
Gamma correction is the brightness for only changing monochromatic LED lamp：
R_LEDout=a11R_LEDin；
G_LEDout=a22G_LEDin；
B_LEDout=a33B_LEDin；
Chromaticity correction is the brightness for not only changing monochromatic LED lamp, also changes its color by adding other monochromatic LED lamps
Degree, therefore generally also referred to as chromaticity correction is bright chroma correction：
In above formula, R_LEDin、G_LEDin、B_LEDinThe three primary colours before correction (red, green, blueness) LED is represented respectively
The bright chroma measured value of lamp, R_LEDout、G_LEDout、B_LEDoutThe bright chroma of the three-primary color LED lamp for needing to reach is represented respectively
Desired value, a11、a22、a33It is brightness correction coefficients,For bright chroma correction coefficient and be a coefficient matrix.
Following citing, the grey exponent number for certain each primary colours is 255 LED display, need to allow it in low GTG
To electric current linear response, by its low grey-scale range, carrying out calibration one by one to 10 low GTGs, it becomes possible to reach demand；
Namely first embodiment of the invention is the part being located in low grey-scale range in all GTGs (255 GTGs) to each primary colours
GTG carries out calibration one by one.Specific bearing calibration can be：First, 10 low GTGs are measured respectively distinguishes corresponding light tone angle value
Lxy；Secondly, using between the corresponding bright chroma desired value of each GTG and bright chroma measured value Lxy in this 10 low GTGs
Difference carry out being calculated the corresponding light tone correction coefficient of each GTG in this 10 low GTGs；Finally, will be calculated
Corresponding bright chroma correction coefficient is uploaded to LED display and is stored this 10 low GTGs respectively.Afterwards, shown in low GTG
When, LED display shows certain low GTG, will extract the GTG corresponding bright chroma correction coefficient and the GTG is corrected,
Then just shown and reached target bright chroma.In the citing, it is to be understood that can also only calculate gamma correction system
Count and omit chromaticity correction coefficient, its purpose that can also reach low gray scale correction.In the present embodiment, by obtaining each one by one
The brightness correction coefficients or bright chroma correction coefficient of low GTG, it is substantially to be driven to change LED when low GTG shows
Electric current.
【Second embodiment】
The technical scheme of the low gray scale correction method of second embodiment of the invention LED display mainly includes two steps
Suddenly：The multiple low GTG is obtained first and distinguishes corresponding multiple brightness measurements, then in modification Gamma (gamma) mapping table
Part gamma value after obtain the multiple low GTG corresponding multiple target gamma values as adjustment factor and be uploaded to respectively
LED display with update LED display storage Gamma mapping tables so that LED display when low GTG shows to electric current
Signal response is linear.In the present embodiment, LED display for example includes the display control system of LED screen body and electrical connection LED screen body
System.Specifically：
During the corresponding multiple brightness measurements of multiple low GTGs difference are obtained：Control LED display first shows
The color of multiple low GTGs, the method for display can make that whole screen all shows the color of certain GTG and multiple low GTGs sequentially show
Show, or once show the color of multiple low GTGs using the shape subregion of trellis diagram.Show many in control LED display
After the color of individual low GTG, the color of the multiple low GTG to showing carries out data acquisition to obtain each low GTG respectively
The corresponding bright chroma measured value Lxy of color.In the present embodiment, the implementation method of data acquisition has various：(1) by light splitting type color
Degree meter measures again and again light tone angle value Lxy, precision highest but less efficient；(2) obtained by the industrial camera of band XYZ filter discs
Light tone angle value Lxy, precision is higher, efficiency is higher, but industrial camera with XYZ filter discs is expensive；(3) by common colour
Digital camera obtains light tone angle value Lxy, first passes through the RGB numerical value that color digital camera obtains each LED point, then changes RGB
Numerical value is XYZ numerical value, and then obtains light tone angle value Lxy.Conversion method in the above method (3) can be：Modelling, look-up table
(LUT, Look up Table), neural network etc..Wherein, modelling be by founding mathematical models, realize RGB=XYZ it
Between linearly or nonlinearly conversion.For example S-curve models, Masking models, GOG (Gain-Offset-Gamma) models or
Multinomial model etc..Look-up table is to set up the look-up table of one-dimensional or three-dimensional (3D-LUT), and look-up table uses interpolation or extrapolation
Algorithm, find out the corresponding relation between RGB=XYZ, the point value fallen on sampling grid summit be vertex value, not on summit
On point obtained by interpolation algorithm using the nearest vertex value of surrounding.Neural net method is exactly non-using artificial neural network
The characteristic of linear transformation, it is established that the mapping relations of RGB=XYZ (positive network), appropriate selection network structure and training sample
The spatial distribution of this collection, can obtain precision higher.
During Gamma mapping tables are changed：The brightness measurements and brightness target value of each low GTG are calculated first
Brightness ratio, be then respectively modified the corresponding gamma value of each low GTG to obtain multiple using the brightness ratio being calculated
Target gamma value is uploaded to LED display as adjustment factor.
Calculate the brightness ratio ratio (or luminance difference) of certain GTG：
R_Lout=ratioRR_Lin；
G_Lout=ratioGG_Lin；
B_Lout=ratioBB_Lin；
Change the corresponding Gamma values of the GTG：
R_Gammaout=ratioRR_Gammain；
G_Gammaout=ratioGG_Gammain；
B_Gammaout=ratioBB_Gammain；
In above formula, R_LEDin、G_LEDin、B_LEDinThe three primary colours before correction (red, green, blueness) LED is represented respectively
The bright chroma measured value of lamp, R_LEDout、G_LEDout、B_LEDoutThe bright chroma of the three-primary color LED lamp for needing to reach is represented respectively
Desired value, ratioR、ratioG、ratioBThe brightness ratio of the three primary colours GTG, R_Gamma are represented respectivelyin、G_Gammain、
B_GammainThe Gamma values before the three primary colours gray scale corrections, R_Gamma are represented respectivelyout、G_Gammaout、B_GammaoutRespectively
Represent the Gamma values after the three primary colours gray scale corrections.
Following citing, the grey exponent number for certain each primary colours is 255 LED display, need to allow it in low GTG
To electric current linear response, by its low grey-scale range, carrying out calibration one by one to 10 low GTGs, it becomes possible to reach demand；
Namely second embodiment of the invention is the part being located in low grey-scale range in all GTGs (255 GTGs) to each primary colours
GTG carries out calibration one by one.Specific bearing calibration can be：First, 10 low GTGs are measured respectively distinguishes corresponding brightness value L；
Secondly, carried out using the difference between the corresponding brightness target value of each GTG and brightness measurements L in this 10 low GTGs
It is calculated the corresponding brightness ratio of each GTG in this 10 low GTGs；Finally, using this 10 low GTGs being calculated
Corresponding brightness ratio changes corresponding Gamma values and obtains multiple target Gamma values and be uploaded to LED as adjustment factor respectively
Display screen with update LED display storage Gamma mapping tables.Afterwards, when low GTG shows, LED display shows that certain is low
GTG, will utilize the Gamma mapping tables after updating to be corrected the GTG, then just shown and to be reached target bright
Degree.In the present embodiment, by updating Gamma mapping tables, it is substantially to drive electricity to change LED when low GTG shows
Stream.
【3rd embodiment】
The technical scheme of the low gray scale correction method of third embodiment of the invention LED display mainly includes two steps
Suddenly：The multiple low GTG is obtained first and distinguishes corresponding multiple brightness measurements, then change each low GTG corresponding two
OE width corresponding to bit (Bit) position of ary codes obtain multiple target OE width as adjustment factor and be uploaded to LED show
Display screen with update LED display storage each low GTG the corresponding OE width of bit so that LED display is in low ash
Current signal is responded when rank shows be linear.In the present embodiment, LED display for example includes LED screen body and electrical connection LED screen
The display control program of body.Specifically：
During the corresponding multiple brightness measurements of multiple low GTGs difference are obtained：Control LED display first shows
The color of multiple low GTGs, the method for display can make that whole screen all shows the color of certain GTG and multiple low GTGs sequentially show
Show, such as shown in Figure 1A；Can also be the color that multiple low GTGs are once shown using the shape subregion of trellis diagram, such as Figure 1B
It is shown.After control LED display shows the color of multiple low GTGs, the color of the multiple low GTG to showing is carried out respectively
Data acquisition is obtaining the corresponding bright chroma measured value Lxy of the color of each low GTG.In the present embodiment, the realization of data acquisition
Method has various：(1) light tone angle value Lxy is measured again and again by light splitting type colorimeter, precision highest but less efficient；(2) lead to
Cross the industrial camera with XYZ filter discs and obtain light tone angle value Lxy, precision is higher, efficiency is higher, but with the industrial camera of XYZ filter discs
It is expensive；(3) light tone angle value Lxy is obtained by common color digital camera, first passes through color digital camera and obtain each LED
The RGB numerical value of lamp point, it is XYZ numerical value then to change RGB numerical value, and then obtains light tone angle value Lxy.Turning in the above method (3)
The method of changing can be：Modelling, look-up table (LUT, Look up Table), neural network etc..Wherein, modelling is by building
Vertical Mathematical Modeling, realizes the linearly or nonlinearly conversion between RGB=XYZ.Such as S-curve models, Masking models, GOG
(Gain-Offset-Gamma) model or multinomial model etc..Look-up table is to set up looking into for one-dimensional or three-dimensional (3D-LUT)
Table, look-up table is looked for find out the corresponding relation between RGB=XYZ using interpolation or the algorithm of extrapolation, fall on sampling grid summit
Point value be vertex value, the nearest vertex value around of the point not on summit is obtained by interpolation algorithm.Neutral net
Method is exactly using the characteristic of artificial neural network nonlinear transformation, it is established that the mapping relations of RGB=XYZ (positive network),
Appropriate selection network structure and the spatial distribution of training sample set, can obtain precision higher.
During the OE width corresponding to bit (Bit) position of the corresponding binary code of each low GTG is changed：It is first
The brightness measurements of each low GTG and the brightness ratio of brightness target value are first calculated, then using the brightness ratio being calculated
It is respectively modified the OE width corresponding to the bit of the corresponding binary code of each low GTG and is made with obtaining multiple target OE width
For adjustment factor is uploaded to LED display.The calculation of target OE width is identical with the calculation of target Gamma value,
This is repeated no more.
Following citing, it is assumed that corresponding binary code is 0111 on hardware such as certain low GTG, as shown in Figure 2.In Fig. 2
In, waveform P1 correspondences binary code 0100 (correspondence GTG 4), waveform P2 correspondences binary code 0010 (correspondence GTG 2), waveform P3
Correspondence binary code 0001 (correspondence GTG 1).
After the brightness measurements for measuring low GTG, if the corresponding GTG of certain bit is inaccurate, using brightness
Ratio changes the corresponding OE width of bit (width of waveform), and the GTG is changed whereby.Therefore, by changing each bit
After the corresponding OE width in position, the LED drive current that LED display exported when low gray scale shows can accordingly change, so that
The brightness for obtaining each low GTG can be consistent with object brightness.
【Fourth embodiment】
Fig. 3 is referred to, fourth embodiment of the invention provides a kind of low gray scale correction system of LED display.Such as Fig. 3 institutes
State, the low gray scale correction system of the present embodiment includes：Display control module 31, data acquisition module 33, adjustment factor calculate mould
Block 35 and adjustment factor uploading module 37.Specifically, display control module 31 is used to control the LED display (for example
LED display) the multiple GTGs of display color, wherein the color is same primary colours (such as red, green is blue), and institute
It is the part gray-scale being located in the corresponding all GTGs of the primary colours in low grey-scale range to state multiple GTGs.Data acquisition module 33
Data acquisition is carried out for the color to the multiple GTG distinguish corresponding multiple brightness at least to obtain the multiple GTG
Measured value.Adjustment factor computing module 35 is used for corresponding respectively with the multiple GTG at least with the multiple brightness measurements
Multiple brightness target values between difference obtain the corresponding multiple adjustment factors of the multiple GTG.Adjustment factor uploading module
37 are used to for the multiple adjustment factor to be uploaded to the LED display, so that the LED display is showing described many
LED drive current is changed so as to realize the correction to the multiple GTG according to the multiple adjustment factor during individual GTG.Additionally,
The low gray scale correction system of fourth embodiment of the invention can be used to perform the low gray scale correction side of foregoing the first to 3rd embodiment
Method, detail refers to preceding description, will not be repeated here.
In sum, the embodiment of the present invention carries out calibration one by one by low GTG, and achievable LED display is for example
LED display is responded when low GTG shows to current signal linear, improves the definition of LED display picture in low gray scale
And sophistication, when can solve the problem that electric current pulsewidth is very narrow, the sound of the driving chip and LED of LED display to electric current
Ying Douhui deviates linear problem, and can solve the problem that discreteness due to LED, the discreteness of driving chip, LED light axle
LED shows caused by the influences of factor such as discreteness, the discreteness of mask mass colour, the inhomogeneities of inside modules heat distribution
Shield and linear problem is deviateed to the response of electric current.
So far, specific case used herein is to the low gray scale correction method and system of LED display of the present invention
Principle and implementation method are set forth, and the explanation of above example is only intended to help and understands the method for the present invention and its core
Thought；Simultaneously for those of ordinary skill in the art, according to thought of the invention, in specific embodiment and range of application
On will change, in sum, this specification content should not be construed as limiting the invention, protection model of the invention
Enclosing should be defined by appended claim.
Claims (9)
1. a kind of low gray scale correction method of LED display, it is characterised in that including step：
A () control LED display shows the colored picture of multiple GTGs and the colored picture to the multiple GTG enters line number
Corresponding multiple brightness measurements are distinguished at least to obtain the multiple GTG according to collection, wherein the color of the multiple GTG is drawn
Face is the colored picture of same primary colours, and the multiple GTG is to be located at low grey-scale range in the corresponding all GTGs of the primary colours
Interior part gray-scale；And
B () is at least between the multiple brightness measurements multiple brightness target values corresponding with the multiple GTG difference
Difference obtains the corresponding multiple adjustment factors of the multiple GTG, and the multiple adjustment factor is uploaded into the LED shows
Device drives electricity so that the LED display changes LED when the multiple GTG is shown according to the multiple adjustment factor
Stream is so as to realize the correction to the multiple GTG；Wherein,
The colored picture of the multiple GTG be multiple colored pictures corresponding with the multiple GTG difference for sequentially showing and
Each colored picture has a single GTG in the multiple colored pictures for sequentially showing, or the multiple GTG color
Picture is the same colored picture that the multiple GTG subregion shows simultaneously.
2. low gray scale correction method as claimed in claim 1, it is characterised in that the step (b) includes：
The difference being utilized respectively between the multiple brightness measurements and the multiple brightness target value calculates multiple brightness schools
Positive coefficient is respectively as the multiple adjustment factor.
3. low gray scale correction method as claimed in claim 1, it is characterised in that the step (a) is included to the multiple ash
The colored picture of rank carries out data acquisition and distinguishes corresponding multigroup bright chroma measured value to obtain the multiple GTG, and described
Step (b) includes：
It is utilized respectively between multigroup bright chroma measured value multigroup bright chroma desired value corresponding with the multiple GTG difference
Difference calculate multiple bright chroma correction coefficient respectively as the multiple adjustment factor；Wherein, each bright chroma correction
Coefficient is a coefficient matrix.
4. low gray scale correction method as claimed in claim 1, it is characterised in that the step (b) includes：
The difference being utilized respectively between the multiple brightness measurements and the multiple brightness target value calculates the multiple ash
Rank distinguishes corresponding multiple brightness ratios；And
Be utilized respectively the multiple brightness ratio change the multiple GTG respectively corresponding multiple gamma values to obtain multiple mesh
Mark gamma value is used as the multiple adjustment factor.
5. low gray scale correction method as claimed in claim 1, it is characterised in that the step (b) includes：
The difference being utilized respectively between the multiple brightness measurements and the multiple brightness target value calculates the multiple ash
Rank distinguishes corresponding multiple brightness ratios；And
The OE width corresponding to the bit of the corresponding binary code of the multiple GTG is changed using the multiple brightness ratio
To obtain multiple target OE width as the multiple adjustment factor.
6. the low gray scale correction system of a kind of LED display, it is characterised in that including：
Display control module, the colored picture for controlling the multiple GTGs of LED display display, wherein the multiple ash
The colored picture of rank is the colored picture of same primary colours, and the multiple GTG is to be located in the corresponding all GTGs of the primary colours
Part gray-scale in low grey-scale range, wherein, the colored picture of the multiple GTG is sequentially showing with the multiple GTG
Each colored picture has single ash in corresponding multiple colored pictures and the multiple colored pictures for sequentially showing respectively
Rank, or the multiple GTG colored picture be the multiple GTG subregion simultaneously show same colored picture；
Data acquisition module, carries out data acquisition at least to obtain the multiple GTG point for the color to the multiple GTG
Not corresponding multiple brightness measurements；
Adjustment factor computing module, for corresponding many with the multiple GTG difference at least with the multiple brightness measurements
Difference between individual brightness target value obtains the corresponding multiple adjustment factors of the multiple GTG；And
Adjustment factor uploading module, for the multiple adjustment factor to be uploaded into the LED display, for the LED
Display device changes LED drive current so as to realize to described when the multiple GTG is shown according to the multiple adjustment factor
The correction of multiple GTGs.
7. low gray scale correction system as claimed in claim 6, it is characterised in that the adjustment factor computing module is specifically used
In：The difference being utilized respectively between the multiple brightness measurements and the multiple brightness target value calculates multiple gamma corrections
Coefficient is respectively as the multiple adjustment factor；Or the data acquisition module is specifically for the color to the multiple GTG
Picture carries out data acquisition and distinguishes corresponding multigroup bright chroma measured value, and the adjustment factor to obtain the multiple GTG
Computing module specifically for：It is utilized respectively multigroup bright chroma measured value multigroup light tone corresponding with the multiple GTG difference
Difference between degree desired value calculates multiple bright chroma correction coefficient respectively as the multiple adjustment factor；Wherein, it is each
Individual bright chroma correction coefficient is a coefficient matrix.
8. low gray scale correction system as claimed in claim 6, it is characterised in that the adjustment factor computing module is specifically used
In：The difference being utilized respectively between the multiple brightness measurements and the multiple brightness target value calculates the multiple GTG
Distinguish corresponding multiple brightness ratios, and be utilized respectively the multiple GTG of the multiple brightness ratio modification and distinguish corresponding
Multiple gamma values are to obtain multiple target gamma values as the multiple adjustment factor.
9. low gray scale correction system as claimed in claim 6, it is characterised in that the adjustment factor computing module is specifically used
In：The difference being utilized respectively between the multiple brightness measurements and the multiple brightness target value calculates the multiple GTG
The corresponding multiple brightness ratios of difference, and change the corresponding binary code of the multiple GTG using the multiple brightness ratio
Bit corresponding to OE width to obtain multiple target OE width as the multiple adjustment factor.
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