CN107799081B - Gamma corrects system and its bearing calibration - Google Patents
Gamma corrects system and its bearing calibration Download PDFInfo
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—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 using liquid crystals
- G09G3/3607—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 using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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- G—PHYSICS
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- 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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- 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
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The present invention provides a kind of Gamma correction system and its bearing calibration, by choosing n grayscale value, corresponding n the first brightness value of n grayscale value is calculated to each sub-pixel, it is again that ordinate forms n match point by abscissa, corresponding n the first brightness values of n grayscale value, the matched curve for obtaining each sub-pixel is fitted to n match point；Finally the matched curve that the total deviation of n the second brightness values n the first brightness value corresponding with the sub-pixel is less than threshold value as the matched curve of the sub-pixel and is stored into memory, each sub-pixel, which can be obtained, according to the matched curve gives brightness corresponding to grayscale value, it does not need to store grayscale value, save hardware resource, and entire correction course only needs to be fitted n match point, substantially reduces correction time.
Description
Technical field
The present invention relates to technical field of liquid crystal display more particularly to a kind of Gamma correction system and its bearing calibrations.
Background technique
Gamma correction is to edit to display screen gamma curve, and gamma curve is gray scale voltage and corresponding brightness
Relation curve, by the adjusting to gray scale voltage, non-linear editing is carried out to brightness of display screen method.Display screen at present
General Gamma value standard is 2.2, and the Gamma value in the case of picture distortion is to deviate 2.2, so the school Gamma of display screen
Face accurately shows essential for color.
Traditional Gamma bearing calibration has manual correction, look-up table.Manual correction needs to post each Gamma grayscale
Storage carries out gray value test, compares with target gray value, gray value debugging, solidifies, and correction time is long；Look-up table needs will be grey
Angle value and corresponding address are stored in memory, and input address is tabled look-up, output gray level value, and correction correctness is high, still
Store data volume is big, and it is big to occupy hardware store resource.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of Gamma correction system and its bearing calibration, needs
Correction time is shorter, does not need storage grayscale value, saves hardware resource.
It is proposed by the present invention the specific technical proposal is: providing a kind of Gamma bearing calibration of correction system, the correction side
Method comprising steps of
Obtain the chromaticity coordinates and brightness value of R sub-pixel, G sub-pixel, B sub-pixel in a pixel unit；
N grayscale value is chosen, according to the calculating of the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
R sub-pixel, G sub-pixel, corresponding n the first brightness value of n grayscale value of each sub-pixel in B sub-pixel, respectively with every
N grayscale value of one sub-pixel is abscissa, corresponding n the first brightness values are n that ordinate forms each sub-pixel
A match point；
The matched curve for obtaining each sub-pixel is fitted to n match point of each sub-pixel；
Corresponding n the second brightness value of n grayscale value is calculated separately according to the matched curve of each sub-pixel, judges n
Whether the total deviation of a second brightness value n the first brightness value corresponding with the sub-pixel is less than threshold value；
If n the second brightness values of the sub-pixel are less than the threshold value with the total deviation of corresponding n the first brightness values,
Then the corresponding matched curve of the sub-pixel is stored into memory.
Further, the R picture is calculated according to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Element, G sub-pixel, corresponding n the first brightness value of n grayscale value of each sub-pixel includes: in B sub-pixel
According to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value calculate W sub-pixel chromaticity coordinates and
Brightness value；
The tristimulus values of the W sub-pixel is calculated according to the chromaticity coordinates of the W sub-pixel and brightness value；
The target brightness value of the R sub-pixel, G sub-pixel, B sub-pixel is calculated according to the tristimulus values of the W sub-pixel；
The son is calculated according to the target brightness value of each sub-pixel in the R sub-pixel, G sub-pixel, B sub-pixel
Corresponding n the first brightness value of n grayscale value of pixel.
Further, the tristimulus values step of the W sub-pixel is calculated in the chromaticity coordinates and brightness value according to the W sub-pixel
Before rapid, the method also includes:
Obtain the maximum brightness value of the R sub-pixel, G sub-pixel, B sub-pixel；
The maximum brightness of the W sub-pixel is calculated according to the maximum brightness value of the R sub-pixel, G sub-pixel, B sub-pixel
Value；
Judge whether the maximum brightness value is greater than the brightness value of the W sub-pixel, if the maximum brightness value is greater than institute
The brightness value of W sub-pixel is stated, then calculates the tristimulus values of the W sub-pixel according to the chromaticity coordinates of the W sub-pixel and brightness value.
Further, method used by being fitted is least square method.
Further, function used by being fitted is Φ (x)=axb, wherein a > 0, b > 0, Φ (x) indicate grayscale value x
Corresponding second brightness value.
Further, n is not less than 4.
Further, n be equal to the value range of 4,4 grayscale values be respectively 0~64,65~128,129~192,193~
255。
Further, the calculating of n the second brightness values and the total deviation of corresponding n the first brightness values of the sub-pixel
Formula are as follows:
Wherein, xiIndicate i-th of grayscale value, Φ (xi) indicate i-th of grayscale value xiCorresponding second brightness value, Y (xi) table
Show i-th of grayscale value xiCorresponding first brightness value.
Further, the threshold value is 5~10.
The present invention also provides a kind of Gamma to correct system, and the Gamma correction system includes:
Acquiring unit, for obtaining R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness in a pixel unit
Value；
Match point generation unit, for choosing n grayscale value, according to the R sub-pixel, G sub-pixel, B sub-pixel color
Coordinate and brightness value calculate that the R sub-pixel, G sub-pixel, n grayscale value of each sub-pixel is n corresponding in B sub-pixel
First brightness value is respectively ordinate by abscissa, corresponding n the first brightness values of n grayscale value of each sub-pixel
Form n match point of each sub-pixel；
Matched curve generation unit is fitted for the n match point to each sub-pixel and obtains each height picture
The matched curve of element；
It is n second corresponding to calculate separately n grayscale value for the matched curve according to each sub-pixel for judging unit
Brightness value, judges whether the total deviation of n the second brightness values n the first brightness value corresponding with the sub-pixel is less than threshold value；
Memory is small for n the second brightness values and the total deviation of corresponding n the first brightness values in the sub-pixel
The sub-pixel corresponding matched curve is stored when the threshold value.
The bearing calibration of Gamma correction system proposed by the present invention, by choosing n grayscale value, to each sub-pixel
Corresponding n the first brightness value of n grayscale value is calculated, then is by abscissa, corresponding n the first brightness values of n grayscale value
Ordinate forms n match point, and the matched curve for obtaining each sub-pixel is fitted to n match point；Finally by n the
The total deviation of two brightness values n the first brightness value corresponding with the sub-pixel is less than the matched curve of threshold value as the sub- picture
The matched curve of element is simultaneously stored into memory, can be obtained each sub-pixel according to the matched curve and be given grayscale value institute
Corresponding brightness does not need to store grayscale value, saves hardware resource, and entire correction course is only needed to n
Match point is fitted, and substantially reduces correction time.
Detailed description of the invention
With reference to the accompanying drawing, by the way that detailed description of specific embodiments of the present invention, technical solution of the present invention will be made
And other beneficial effects are apparent.
Fig. 1 is the flow chart for the bearing calibration that Gamma corrects system；
Fig. 2 is the structure chart that Gamma corrects system.
Specific embodiment
Hereinafter, with reference to the accompanying drawings to detailed description of the present invention embodiment.However, it is possible to come in many different forms real
The present invention is applied, and the present invention should not be construed as limited to the specific embodiment illustrated here.On the contrary, providing these implementations
Example is in order to explain the principle of the present invention and its practical application, to make others skilled in the art it will be appreciated that the present invention
Various embodiments and be suitable for the various modifications of specific intended application.In the accompanying drawings, identical label will be used for table always
Show identical element.
Referring to Fig.1, Gamma provided in this embodiment correction system bearing calibration comprising steps of
S1, the chromaticity coordinates and brightness value for obtaining R sub-pixel, G sub-pixel, B sub-pixel in a pixel unit, wherein one
A pixel unit includes three sub-pixels, these three sub-pixels are respectively R sub-pixel, G sub-pixel, B sub-pixel；
S2, n grayscale value is chosen, R picture is calculated according to R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Element, G sub-pixel, corresponding n the first brightness value of n grayscale value of each sub-pixel in B sub-pixel, respectively with each height
N grayscale value of pixel is abscissa, corresponding n the first brightness values are that ordinate forms n of each sub-pixel and is fitted
Point；
S3, the matched curve for obtaining each sub-pixel is fitted to n match point of each sub-pixel；
S4, corresponding n the second brightness value of n grayscale value is calculated separately according to the matched curve of each sub-pixel, sentence
Whether the total deviation of a second brightness values of the n that breaks n the first brightness value corresponding with the sub-pixel is less than threshold value；
If n the second brightness values of S5, the sub-pixel are less than the threshold value with the total deviation of corresponding n the first brightness values,
Then the corresponding matched curve of the sub-pixel is stored into memory.
By taking the bearing calibration of Gamma correction system is applied in AMOLED as an example, below specifically in the present embodiment
Bearing calibration is described.
In step sl, the Gamma voltage of input test, obtain R sub-pixel, G sub-pixel, B sub-pixel chromaticity coordinates and
Brightness value, wherein the chromaticity coordinates of R sub-pixel and brightness are expressed as (xr, yr, Yr), xr, yrIndicate the chromaticity coordinates of R sub-pixel, YrTable
Show the brightness of R sub-pixel；The chromaticity coordinates of G sub-pixel and brightness are expressed as (xg, yg, Yg), xg, ygIndicate the chromaticity coordinates of G sub-pixel,
YgIndicate the brightness of G sub-pixel；The chromaticity coordinates of B sub-pixel and brightness are expressed as (xb, yb, Yb), xb, ybIndicate the color of B sub-pixel
Coordinate, YbIndicate the brightness of B sub-pixel；The chromaticity coordinates of W sub-pixel and brightness are expressed as (xw, yw, Yw), xw, ywIndicate W sub-pixel
Chromaticity coordinates, YwIndicate the brightness of W sub-pixel.
In step s 2, n grayscale value x is choseni, i=1~n, according to the color of R sub-pixel, G sub-pixel, B sub-pixel seat
Mark n a first corresponding with n grayscale value of each sub-pixel in brightness value calculating R sub-pixel, G sub-pixel, B sub-pixel is bright
Angle value Y (xi), i.e., n grayscale of R sub-pixel is first calculated according to R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
It is worth corresponding n the first brightness value YR(xi),YR(xi) indicate corresponding with R sub-pixel the first brightness value, further according to R sub-pixel,
G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value calculate corresponding n the first brightness value Y of n grayscale value of G sub-pixelG
(xi),YG(xi) indicate the first brightness value corresponding with R sub-pixel, finally sat according to the color of R sub-pixel, G sub-pixel, B sub-pixel
Mark n first brightness value Y corresponding with brightness value calculating n grayscale value of B sub-pixelB(xi),YB(xi) indicate and R sub-pixel
Corresponding first brightness value.
It is respectively that ordinate is formed by abscissa, corresponding n the first brightness values of n grayscale value of each sub-pixel
The corresponding n match point of n match point of each sub-pixel, i.e. R sub-pixel is (x1, YR(x1))、(x2, YR(x2))、……、
(xn, YR(xn)), the corresponding n match point of G sub-pixel is (x1, YG(x1))、(x2, YG(x2))、……、(xn, YG(xn)), B
The corresponding n match point of pixel is (x1, YB(x1))、(x2, YB(x2))、……、(xn, YB(xn))。
The quantity of match point is more, and the curve accuracy being fitted is higher, and the match point calculation amounts needed just more
It is bigger, therefore, it can determine the size of n value according to actual needs in fit procedure, n is not less than 3 in the present embodiment.It determines
After the quantity of match point, entire grayscale value range 0~255 is divided into the gray scale interval of several equal lengths, then each
A match point is chosen in section, for example, n=3, then gray scale interval is 0~85,86~171,172~255；N=4, gray area
Between be 0~64,65~128,129~192,193~255,4 grayscale values can for 64,128,192,255, n be other values
When, and so on.Preferably, n=4, the bearing calibration of the present embodiment will be described by taking n=4 as an example below.
Specifically, step S2 includes:
S21, according to R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value calculate W sub-pixel chromaticity coordinates and
Brightness value (xw, yw, Yw), wherein W sub-pixel is synthesized by R sub-pixel, G sub-pixel, B sub-pixel, and calculation formula is as follows:
S22, chromaticity coordinates and brightness value (x according to W sub-pixelw, yw, Yw) calculate W sub-pixel tristimulus values (XW, YW,
ZW), calculation formula is as follows:
S23, the tristimulus values (X according to W sub-pixelW, YW, ZW) to calculate R sub-pixel, G sub-pixel, the target of B sub-pixel bright
Angle value YR,YG,YB, calculation formula is as follows:
S24, sub-pixel is calculated according to the target brightness value of each sub-pixel in R sub-pixel, G sub-pixel, B sub-pixel
Corresponding n the first brightness value Y (x of n grayscale valuei), calculation formula is as follows:
YR(xi)=YR×(xi/255)^gamma
YG(xi)=YG×(xi/255)^gamma
YB(xi)=YB×(xi/255)^gamma
Wherein, gamma=2.2, i=1~4, then corresponding 4 match points of R sub-pixel are (x1, YR(x1))、(x2, YR
(x2))、(x3, YR(x3))、(x4, YR(x4))；Corresponding 4 match points of G sub-pixel are (x1, YG(x1))、(x2, YG(x2))、(x3,
YG(x3))、(x4, YG(x4))；Corresponding 4 match points of B sub-pixel are (x1, YB(x1))、(x2, YB(x2))、(x3, YB(x3))、
(x4, YB(x4))。
The present embodiment before step S22, the method also includes:
S211, the maximum brightness value for obtaining R sub-pixel, G sub-pixel, B sub-pixel；
S212, the maximum brightness value of W sub-pixel is determined according to the maximum brightness value of R sub-pixel, G sub-pixel, B sub-pixel,
Wherein, R sub-pixel, G sub-pixel, B sub-pixel maximum brightness value according to driving IC register set, W sub-pixel
Brightness is synthesized by the brightness of R sub-pixel, G sub-pixel, B sub-pixel, and therefore, the maximum brightness value of W sub-pixel is equal to R picture
Element, G sub-pixel, B sub-pixel maximum brightness value in maximum value；
S213, judge whether the maximum brightness value of W sub-pixel is greater than the brightness value of W sub-pixel, if W sub-pixel is most light
Angle value is greater than the brightness value of W sub-pixel, then enters step S22.
By the reliability of step S211~S213 data that can guarantee to obtain, so that guarantee entire fit procedure can
By property, the stability of entire correction system is promoted.
In step s3, the fitting song for obtaining each sub-pixel is fitted to n match point of each sub-pixel
Line, method used by being fitted in the present embodiment are least square method, and function used by being fitted is Φ (x)=axb, a > 0, b
> 0, Φ (x) indicate corresponding second brightness value of grayscale value x.Certainly, the fitting function in the present embodiment also can choose other
The fitting function of functional form, for example, polynomial function, here without limitation.
4 match points corresponding to R sub-pixel are (x1, YR(x1))、(x2, YR(x2))、(x3, YR(x3))、(x4, YR(x4))
Least square normal equation system used by being fitted are as follows:
Wherein,
The matched curve of R sub-pixel can be obtained by solving above-mentioned least square normal equation system
4 match points corresponding to G sub-pixel are (x1, YG(x1))、(x2, YG(x2))、(x3, YG(x3))、(x4, YG(x4))
Least square normal equation system used by being fitted are as follows:
Wherein,
The matched curve of G sub-pixel can be obtained by solving above-mentioned least square normal equation system
Similarly, 4 match points corresponding to B sub-pixel are (x1, YB(x1))、(x2, YB(x2))、(x3, YB(x3))、(x4, YB
(x4)) it is fitted used least square normal equation system are as follows:
Wherein,
The matched curve of G sub-pixel can be obtained by solving above-mentioned least square normal equation system
In step s 4, to calculate separately n grayscale value corresponding n second according to the matched curve of each sub-pixel bright
Angle value, judges whether the total deviation of n the second brightness values n the first brightness value corresponding with the sub-pixel is less than threshold epsilon0.This
In embodiment, the calculation formula of n the second brightness values and the total deviation ε of corresponding n the first brightness values of each sub-pixel
Are as follows:
Wherein, xiIndicate i-th of grayscale value, Φ (xi) indicate i-th of grayscale value xiCorresponding second brightness value, Y (xi) table
Show i-th of grayscale value xiCorresponding first brightness value.
Corresponding 4 the second brightness values of 4 grayscale values of R sub-pixel are (x1, ΦR(x1))、(x2, ΦR(x2))、(x3, ΦR
(x3))、(x4, ΦR(x4)), then the corresponding total deviation of R sub-pixel are as follows:
Corresponding 4 the second brightness values of 4 grayscale values of G sub-pixel are (x1, ΦG(x1))、(x2, ΦG(x2))、(x3, ΦG
(x3))、(x4, ΦG(x4)), then the corresponding total deviation of R sub-pixel are as follows:
Corresponding 4 the second brightness values of 4 grayscale values of B sub-pixel are (x1, ΦB(x1))、(x2, ΦB(x2))、(x3, ΦB
(x3))、(x4, ΦB(x4)), then the corresponding total deviation of R sub-pixel are as follows:
In step s 5, if n the second brightness values and the total deviation ε of corresponding n the first brightness values of the sub-pixel are small
In the threshold epsilon0, i.e. ε < ε0, then by the corresponding matched curve Φ (x) of the sub-pixel=axbIt stores into memory, the present embodiment
In 5≤ε0≤ 10, in practical correction course, it can according to need adjustment ε0Range.
The present embodiment can obtain each sub-pixel according to matched curve and give brightness corresponding to grayscale value, be not required to
Grayscale value is stored, save hardware resource, and entire correction course only needs to be fitted n match point,
Substantially reduce correction time.In addition, the present embodiment is generating the influence that W sub-pixel is also contemplated when matched curve, therefore, this
The bearing calibration of embodiment is also corrected white balance while correcting to Gamma, likewise, white balance is greatly saved
Correction time.
The present embodiment additionally provides a kind of Gamma correction system, and the Gamma correction system includes acquiring unit 1, fitting
Point generation unit 2, matched curve generation unit 3, judging unit 4, memory 5.Acquiring unit 1 is for obtaining a pixel unit
Middle R sub-pixel, G sub-pixel, B sub-pixel chromaticity coordinates and brightness value.
Match point generation unit 2 for choosing n grayscale value, according to the R sub-pixel, G sub-pixel, B sub-pixel color
Coordinate and brightness value calculate R sub-pixel, G sub-pixel, in B sub-pixel each sub-pixel the corresponding n of n grayscale value a first
Brightness value is respectively that ordinate is formed by abscissa, corresponding n the first brightness values of n grayscale value of each sub-pixel
N match point of each sub-pixel.
Matched curve generation unit 3, which is used to be fitted n match point of each sub-pixel, obtains each height picture
The matched curve of element.Judging unit 4 is used to calculate separately the corresponding n of n grayscale value according to the matched curve of each sub-pixel
A second brightness value, judges whether the total deviation of n the second brightness values n the first brightness value corresponding with the sub-pixel is less than threshold
Value.Memory 5 is used to be less than threshold value with the total deviation of corresponding n the first brightness values in n the second brightness values of the sub-pixel
When store the corresponding matched curve of the sub-pixel.
Match point generation unit 2 is also respectively applied for according to R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness
Value calculates the chromaticity coordinates and brightness value (x of W sub-pixelw, yw, Yw), according to the chromaticity coordinates and brightness value (x of W sub-pixelw, yw, Yw) meter
Calculate the tristimulus values (X of W sub-pixelW, YW, ZW), according to the tristimulus values (X of W sub-pixelW, YW, ZW) calculate R sub-pixel, G picture
The target brightness value Y of element, B sub-pixelR,YG,YBAnd according to each sub-pixel in R sub-pixel, G sub-pixel, B sub-pixel
Target brightness value calculates corresponding n the first brightness value Y (x of n grayscale value of sub-pixeli)。
In addition, match point generation unit 2 also be used to obtain R sub-pixel, G sub-pixel, B sub-pixel maximum brightness value,
It determines the maximum brightness value of W sub-pixel according to the maximum brightness value of R sub-pixel, G sub-pixel, B sub-pixel and judges W sub-pixel
Maximum brightness value whether be greater than the brightness value of W sub-pixel.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection scope of the application.
Claims (9)
1. a kind of bearing calibration of Gamma correction system, which is characterized in that comprising steps of
Obtain the chromaticity coordinates and brightness value of R sub-pixel, G sub-pixel, B sub-pixel in a pixel unit；
N grayscale value is chosen, R is calculated according to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Pixel, G sub-pixel, corresponding n the first brightness value of n grayscale value of each sub-pixel in B sub-pixel, respectively with each
N grayscale value of sub-pixel is abscissa, corresponding n the first brightness values be ordinate formed n of each sub-pixel it is quasi-
Chalaza；
The matched curve for obtaining each sub-pixel is fitted to n match point of each sub-pixel；
Corresponding n the second brightness values of n grayscale value are calculated separately according to the matched curve of each sub-pixel, judge n the
Whether the total deviation of two brightness values n the first brightness value corresponding with the sub-pixel is less than threshold value；
If n the second brightness values of the sub-pixel are less than the threshold value with the total deviation of corresponding n the first brightness values, will
The corresponding matched curve of the sub-pixel is stored into memory,
Wherein, the R sub-pixel, G picture are calculated according to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Corresponding n the first brightness value of n grayscale value of each sub-pixel includes: in element, B sub-pixel
Chromaticity coordinates and the brightness of W sub-pixel are calculated according to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Value；
The tristimulus values of the W sub-pixel is calculated according to the chromaticity coordinates of the W sub-pixel and brightness value；
The target brightness value of the R sub-pixel, G sub-pixel, B sub-pixel is calculated according to the tristimulus values of the W sub-pixel；
The sub-pixel is calculated according to the target brightness value of each sub-pixel in the R sub-pixel, G sub-pixel, B sub-pixel
Corresponding n the first brightness values of n grayscale value.
2. bearing calibration according to claim 1, which is characterized in that according to the W sub-pixel chromaticity coordinates and brightness
Before value calculates the tristimulus values step of the W sub-pixel, the method also includes:
Obtain the maximum brightness value of the R sub-pixel, G sub-pixel, B sub-pixel；
The maximum brightness value of the W sub-pixel is calculated according to the maximum brightness value of the R sub-pixel, G sub-pixel, B sub-pixel；
Judge whether the maximum brightness value is greater than the brightness value of the W sub-pixel, if the maximum brightness value is greater than W
The brightness value of pixel then calculates the tristimulus values of the W sub-pixel according to the chromaticity coordinates of the W sub-pixel and brightness value.
3. bearing calibration according to claim 1, which is characterized in that method used by being fitted is least square method.
4. bearing calibration according to claim 3, which is characterized in that function used by being fitted is Φ (x)=axb,
In, a > 0, b > 0, Φ (x) indicate corresponding second brightness value of grayscale value x.
5. bearing calibration according to claim 4, which is characterized in that n is not less than 3.
6. bearing calibration according to claim 4, which is characterized in that n be equal to 4,4 grayscale values value range be respectively
0~64,65~128,129~192,193~255.
7. bearing calibration according to claim 1, which is characterized in that the n of the sub-pixel the second brightness values with it is corresponding
N the first brightness value total deviation calculation formula are as follows:
Wherein, xiIndicate i-th of grayscale value, Φ (xi) indicate i-th of grayscale value xiCorresponding second brightness value, Y (xi) indicate i-th
A grayscale value xiCorresponding first brightness value.
8. bearing calibration according to claim 1, which is characterized in that the threshold value is 5~10.
9. a kind of Gamma corrects system characterized by comprising
Acquiring unit, for obtaining the chromaticity coordinates and brightness value of R sub-pixel, G sub-pixel, B sub-pixel in a pixel unit；
Match point generation unit, for choosing n grayscale value, according to the R sub-pixel, G sub-pixel, B sub-pixel chromaticity coordinates
Calculate that the R sub-pixel, G sub-pixel, n grayscale value of each sub-pixel is n first corresponding in B sub-pixel with brightness value
Brightness value is respectively that ordinate is formed by abscissa, corresponding n the first brightness values of n grayscale value of each sub-pixel
N match point of each sub-pixel,
Wherein, the R sub-pixel, G picture are calculated according to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Corresponding n the first brightness value of n grayscale value of each sub-pixel includes: in element, B sub-pixel
Chromaticity coordinates and the brightness of W sub-pixel are calculated according to the R sub-pixel, G sub-pixel, the chromaticity coordinates of B sub-pixel and brightness value
Value；
The tristimulus values of the W sub-pixel is calculated according to the chromaticity coordinates of the W sub-pixel and brightness value；
The target brightness value of the R sub-pixel, G sub-pixel, B sub-pixel is calculated according to the tristimulus values of the W sub-pixel；
The sub-pixel is calculated according to the target brightness value of each sub-pixel in the R sub-pixel, G sub-pixel, B sub-pixel
Corresponding n the first brightness values of n grayscale value；
Matched curve generation unit is fitted for the n match point to each sub-pixel and obtains each sub-pixel
Matched curve；
Judging unit calculates separately corresponding n the second brightness of n grayscale value for the matched curve according to each sub-pixel
Value, judges whether the total deviation of n the second brightness values n the first brightness value corresponding with the sub-pixel is less than threshold value；
Memory is less than institute with the total deviation of corresponding n the first brightness values for n the second brightness values in the sub-pixel
The sub-pixel corresponding matched curve is stored when stating threshold value.
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| CN109215614A (en) * | 2018-09-25 | 2019-01-15 | 深圳暴风统帅科技有限公司 | A kind of image quality adjusting method, regulating device and terminal device |
| CN109448644B (en) * | 2018-10-11 | 2021-07-16 | 广州视源电子科技股份有限公司 | Method for correcting gray scale display curve of display device, electronic device and computer readable storage medium |
| CN111326099B (en) * | 2018-12-14 | 2021-10-01 | 西安诺瓦星云科技股份有限公司 | Display correction method, device and system, storage medium and display system |
| CN110428777B (en) | 2019-08-14 | 2021-01-22 | 京东方科技集团股份有限公司 | Display correction method and device of display module |
| CN110660352B (en) * | 2019-11-05 | 2021-03-02 | 深圳市奥拓电子股份有限公司 | Point-to-point correction method, device and system for LED display screen and storage medium |
| CN110796979B (en) * | 2019-11-14 | 2020-07-31 | 华兴源创(成都)科技有限公司 | Driving method and driving device of display panel |
| CN110767164A (en) * | 2019-11-18 | 2020-02-07 | 安徽熙泰智能科技有限公司 | Gamma correction method for cubic spline curve fitting |
| CN111968590B (en) * | 2020-08-12 | 2021-10-08 | Tcl华星光电技术有限公司 | Picture display adjusting method and device, storage medium and display equipment |
| US11114051B1 (en) | 2020-08-12 | 2021-09-07 | Tcl China Star Optoelectronics Technology Co., Ltd. | Method, storage medium and display device for adjusting a displayed image |
| CN112201192B (en) * | 2020-10-15 | 2023-08-04 | 深圳市汇顶科技股份有限公司 | Method, device, equipment and medium for determining gamma value of display |
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