[go: up one dir, main page]

CN110660352B - Point-to-point correction method, device and system for LED display screen and storage medium - Google Patents

Point-to-point correction method, device and system for LED display screen and storage medium Download PDF

Info

Publication number
CN110660352B
CN110660352B CN201911068223.0A CN201911068223A CN110660352B CN 110660352 B CN110660352 B CN 110660352B CN 201911068223 A CN201911068223 A CN 201911068223A CN 110660352 B CN110660352 B CN 110660352B
Authority
CN
China
Prior art keywords
point
matrix
led display
module
correction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911068223.0A
Other languages
Chinese (zh)
Other versions
CN110660352A (en
Inventor
谢明璞
孔德建
吴涵渠
吴振志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Aoto Electronics Co Ltd
Original Assignee
Shenzhen Aoto Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Aoto Electronics Co Ltd filed Critical Shenzhen Aoto Electronics Co Ltd
Priority to CN201911068223.0A priority Critical patent/CN110660352B/en
Publication of CN110660352A publication Critical patent/CN110660352A/en
Application granted granted Critical
Publication of CN110660352B publication Critical patent/CN110660352B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention relates to a point-by-point correction method, a device and a system for an LED display screen and a storage medium, wherein the point-by-point correction method for the LED display screen comprises the steps of acquiring a three-color tristimulus value matrix of the LED display screen as a correction data conversion target value; replacing the new LED display module, and reading back a three-color tristimulus value matrix of point-by-point chromaticity correction of the module; calculating a correction data change matrix T according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the replaced LED display module; calculating to obtain a changed correction data matrix of each pixel point according to the T and the correction data matrix of each pixel point on the updated LED display module; and performing point-by-point chromaticity correction on each pixel on the replaced LED module by using the obtained changed correction coefficient matrix, so that the brightness, chromaticity and uniformity of the LED display screen are greatly improved, and the system is faster and safer in operation speed.

Description

Point-to-point correction method, device and system for LED display screen and storage medium
Technical Field
The invention relates to the technical field of LED display correction, in particular to a point-by-point correction method, device and system for an LED display screen and a storage medium.
Background
In modern commercial environments, the LED display industry is rapidly evolving. The LED display screen is a flat panel display device composed of LED lattices, and compared with other traditional information media, the LED display screen has the advantages of adjustable brightness range, safety, reliability, electricity saving, environmental protection, accurate color embodiment, clear visual expression and the like. Along with the gradual improvement of the brightness of the LED display screen and the stronger optical density and adaptability, the display quality is rapidly improved.
In the existing point-by-point correction technology, the luminance and chromaticity data of each LED lamp point on the LED display screen are collected, the correction coefficient of each LED lamp point is obtained through calculation and then is sent to the control system, the control system applies the correction coefficient to realize point-to-point driving of each LED lamp point, and the pixel luminance, saturation and chromaticity uniformity of the LED display screen are improved. For a long time, the brightness, chromaticity and uniformity of the LED display screen are influenced by factors such as lamp beads, welding, structural design, heat dissipation and brightness of the LED display screen, and the development of the industry is seriously disturbed. When the point-by-point correction is performed, a correction target value needs to be selected, and the deviation of the value can cause chromatic aberration, so that the visual effect is obviously poor. At this time, the correction target value needs to be changed, and the correction coefficient needs to be recalculated, resulting in an increase in the number of calculations. Meanwhile, the number of LED pixels of the LED display screen is increased rapidly, which causes the calculation amount of the original brightness and chromaticity of the LED lamp to increase rapidly, and seriously affects the system operation speed and safety, and a more scientific point-by-point correction method, device, system and machine-readable storage medium for the LED display screen are needed.
Disclosure of Invention
In view of the above, in order to overcome the defects in the prior art, the invention provides a method, an apparatus, a system and a storage medium for correcting an LED display screen point by point.
An embodiment of the present invention provides a point-by-point correction method for an LED display screen, including:
acquiring a three-color tri-stimulus value matrix of the LED display screen as a correction data conversion target value;
replacing the new LED display module, and reading back a three-color tristimulus value matrix of point-by-point chromaticity correction of the module;
calculating a correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the updated LED display module;
calculating to obtain a changed correction data matrix of each pixel point according to the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module;
performing point-by-point chromaticity correction on each pixel on the updated LED module by using the obtained correction coefficient matrix after the change;
the method for acquiring the three-color tristimulus value matrix of the LED display screen as the correction data conversion target value comprises the following steps:
respectively measuring the brightness values and color coordinate values of the red, green, blue and white of the whole screen by using a cursor gun;
and performing fitting calculation by using the brightness values of red, green, blue and white and the color coordinate values.
Preferably, the fitting calculation is performed by using the brightness values and color coordinate values of red, green, blue and white colors to reduce the error of measuring the tristimulus values of red, green and blue colors, and the method comprises the following steps:
step 1: the brightness and color coordinate values obtained by measurement are respectively set as follows:
red is (Y)r，xr，yr)；
Green is (Y)g，xg，yg)；
Blue is (Y)b，xb，yb)；
White is (Y)w，xw，yw)；
Said Y isrIs a red luminance value, said YgFor green brightness value of said YbIs a blue luminance value, said YwIs a white luminance value, said (x)r，yr) Is a red coordinate value, said (x)g，yg) Is a green coordinate value, (x)b，yb) Is a blue coordinate value, (x)w，yw) Is a white coordinate value; the values of x, y are relatively precise; said Y isrRed luminance value of, the YgGreen luminance value of, the YbAnd said Y and said blue luminance value ofwIs relatively inaccurate; in the white color, the proportions of red, green and blue are r, g and b respectively, and then the step 2 is carried out;
step 2: the proportion of 3 colors of red, green and blue in white, namely the numerical values of r, g and b, is calculated by using relatively accurate color coordinate values, and the formula is as follows:
Figure GDA0002816907490000021
then, the brightness ratio r of red, green and blue 3 is calculatedy，gy，byThe formula is:
Figure GDA0002816907490000031
Figure GDA0002816907490000032
Figure GDA0002816907490000033
and step 3: the luminance value Y 'of white color was fitted by the least square method'wThe value, luminance value variance formula is:
(Yr-r Y’w)2+(Yg-g Y’w)2+(Yb-bY’w)2+(Yw-Y’w)2；
deriving the above formula and making the derivative be 0 to obtain Y 'with the minimum variance'wThe formula is as follows:
Figure GDA0002816907490000034
and 4, step 4: with the fitted white luminance value Y'wCalculating fitted three-color luminance values Y 'of red, green and blue'r，Y’g，Y’bThe Y ' r, Y ' g and Y ' b are the red, green and blue three-color brightness values calculated by fitting, are more accurate than the direct measurement of the light gun, and are distinguished by adding a superscript, and the formula is as follows:
Y’r＝rY’w
Y’g＝gY’w
Y’b＝bY’w
and 5: calculating the tristimulus values of the red, the green and the blue according to the fitted three-color brightness values of the red, the green and the blue and the measured coordinates of the red, the green and the blue, wherein the formula is as follows:
Figure GDA0002816907490000035
Yc＝Y′c
Figure GDA0002816907490000036
c, respectively taking r, g and b colors;
according to the three-color tristimulus values calculated by the formula, a whole-screen three-color tristimulus value matrix can be formed:
Figure GDA0002816907490000037
the M issAnd obtaining a three-color tristimulus value matrix of the LED display screen.
Preferably, the calculation formula for calculating the correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the replaced LED display module is as follows:
according to the three-color tristimulus values calculated by the formula, a whole-screen three-color tristimulus value matrix can be formed:
Figure GDA0002816907490000041
in the above formula, the three-color tristimulus value matrix of the replaced LED display module is Mm；
Figure GDA0002816907490000042
Is MmThe inverse matrix of (d); t is the correction data change matrix; the M issAnd obtaining a three-color tristimulus value matrix of the LED display screen.
Preferably, the method for obtaining the changed correction data matrix of each pixel point by calculation according to the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module includes;
storing correction data of each pixel point in the module in a memory on the LED display module, wherein the correction data of each pixel point comprises 9 coefficients and can form 1 3x3 matrix, namely, each pixel point on the module corresponds to 1 matrix Cp：
Figure GDA0002816907490000043
In the above formula, the subscript P represents a pixel;
with CgrFor example, CgrGreen before correction is applied to red after correction, and the other coefficients are sequentially estimated;
the method for obtaining the corrected matrix through calculation according to the correction data change matrix T and the correction data matrix of each pixel point on the updated LED display module comprises the following steps of;
the correction data change matrix is T, and the T is applied to the correction data C of each pixel of the updating modulepAnd, such that:
C′p＝CpT
obtaining the correction data matrix C 'after the change of the pixel points'p；
Then, after the correction data is changed, the calculation formula of the three-color tristimulus value matrix of the new module is replaced by:
Figure GDA0002816907490000051
in the above formula MpAnd CpAnd correcting the front three-color tristimulus value matrix and the chromaticity correction data matrix point by point for any pixel point on the LED module.
Preferably, the method for performing point-by-point chromaticity correction on each pixel on the updated LED module by using the obtained post-change correction coefficient matrix includes:
for any input image color value (R, G, B), the calculation formula of XYZ tristimulus values output on the entire LED display screen is:
Figure GDA0002816907490000052
and the calculation formula of the XYZ tristimulus values output on the replaced LED module is as follows:
Figure GDA0002816907490000053
in the above formula MpAnd CpAnd correcting the front three-color tristimulus value matrix and the chromaticity correction data matrix point by point for any pixel point on the LED module. R, G, B represent image pixel color values.
Preferably, before the step of replacing the new LED display module and reading back the tristimulus value matrix of the three-color with point-by-point chromaticity correction, the method further includes:
and storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during module production for providing the read-back module with the three tristimulus value matrix for point-by-point chromaticity correction.
The invention also provides a point-by-point correction device for the LED display screen, which comprises:
the acquisition module is used for acquiring the brightness value and the color coordinate value of the LED display screen, acquiring a three-color tristimulus value matrix of the LED display screen and taking the three-color tristimulus value matrix as a correction data conversion target value;
the processor is used for reading back a three-color tristimulus value matrix of the module point-by-point chromaticity correction; forming a point-by-point correction instruction of the LED display screen;
the matrix calculation module is used for calculating a correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the replaced LED display module; the correction data change matrix is used for changing the correction data matrix of each pixel point on the LED display module to obtain the correction data matrix of each pixel point;
the correction processing module is used for performing point-by-point chromaticity correction on each pixel on the LED display module group which is updated by using the obtained changed correction coefficient matrix;
the receiving and sending module is used for carrying out point-by-point chromaticity correction on the three-color tristimulus value matrix, the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module, and carrying out data interaction among the storage module, the calculation module and/or the processor; uploading the obtained point-by-point chromaticity correction data of each pixel on the LED display module group which is updated by the changed correction coefficient matrix to the LED display screen so as to finish the correction of the area to be corrected of the LED display screen;
the storage module is used for storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during production; the tri-color tri-stimulus value matrix is used for providing point-by-point chromaticity correction for the read-back module.
The invention also provides a point-by-point correction system of the LED display screen, which comprises the following steps:
the acquisition module is used for acquiring the brightness value and the color coordinate value of the LED display screen, acquiring a three-color tristimulus value matrix of the LED display screen and taking the three-color tristimulus value matrix as a correction data conversion target value;
the processor is used for reading back a three-color tristimulus value matrix of the module point-by-point chromaticity correction; forming a point-by-point correction instruction of the LED display screen;
the matrix calculation module is used for calculating a correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the replaced LED display module; the correction data change matrix is used for changing the correction data matrix of each pixel point on the LED display module to obtain the correction data matrix of each pixel point;
the correction processing module is used for performing point-by-point chromaticity correction on each pixel on the LED display module group which is updated by using the obtained changed correction coefficient matrix;
the receiving and sending module is used for carrying out point-by-point chromaticity correction on the three-color tristimulus value matrix, the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module, and carrying out data interaction among the storage module, the calculation module and/or the processor; uploading the obtained point-by-point chromaticity correction data of each pixel on the LED display module group which is updated by the changed correction coefficient matrix to the LED display screen so as to finish the correction of the area to be corrected of the LED display screen;
the storage module is used for storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during production; the tri-color tri-stimulus value matrix is used for providing point-by-point chromaticity correction for the read-back module.
The invention also provides a storage medium, which stores machine executable commands, and when the storage medium is called and executed by a processor, the processor executable commands realize any one of the LED display screen point-by-point correction methods.
The invention provides a point-by-point correction method for an LED display screen. When the module is replaced, the correction data change matrix T is calculated according to the brightness values and the color coordinate values of the red, green and blue pixel points and the white pixel points of the read-back module. And then, when the module color coordinate value correction data is read back, multiplying the correction matrix of each point by T to obtain an actual correction matrix and applying the actual correction matrix. The invention does not directly apply the correction data stored in the module, but applies the matrix method to transform the module correction data and apply the module correction data according to the difference of the color coordinate value parameters of the screen body and the module. When the module color coordinate parameters are different from the screen body color coordinate parameters, the module correction data can be used through calculation without re-correction. Therefore, the brightness, the chromaticity and the uniformity of the LED display screen are greatly improved, the chromatic aberration caused by directly selecting the stored correction target value during point-by-point correction is avoided, and the visual effect is obviously improved. Meanwhile, the increase of calculation times caused by repeatedly changing the correction target value is avoided, so that the system has higher running speed and is safer. Meanwhile, the method can be applied to large-scale LED display screens, and the rapid superposition and increase of the calculation amount of the original brightness and the chromaticity of the LED lamp points cannot be caused due to the rapid increase of the number of the LED pixel points. The invention can provide high-speed system operation and convenient and safe maintenance service for the large-scale LED display screen, and is a more scientific point-by-point correction method and device for the LED display screen and a machine readable storage medium.
Drawings
FIG. 1 is a flowchart illustrating a point-by-point calibration method for an LED display screen according to an embodiment of the present invention;
fig. 2 is a structural diagram of a point-by-point calibration apparatus for an LED display screen according to an embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, a method for correcting an LED display screen point by point includes:
s100: three-color tristimulus value matrix M of LED display screen is obtainedsAs a correction data conversion target value;
three-color tristimulus value matrix M of LED display screen is obtainedsThe method of converting the target value as the correction data includes;
respectively measuring the brightness values and color coordinate values of the red, green, blue and white of the whole screen by using a cursor gun;
and performing fitting calculation by using the brightness values of red, green, blue and white and the color coordinate values.
Fitting and calculating three-color tristimulus values of red, green and blue by using four-color brightness values and color coordinate values of red, green, blue and white to reduce measurement errors of the tristimulus values for directly measuring the red, green and blue, wherein the method comprises the following steps:
step 1: measuring the brightness values and color coordinate values of red, green and blue to obtain:
red is (Y)r，xr，yr)；
Green is (Y)g，xg，yg)；
Blue is (Y)b，xb，yb)；
White is (Y)w，xw，yw)；
Said Y isrIs a red luminance value, said YgFor green brightness value of said YbIs a blue luminance value, said YwIs a white luminance value, said (x)r，yr) Is a red coordinate value, said (x)g，yg) Is a green coordinate value, (x)b，yb) Is a blue coordinate value, (x)w，yw) Is a white coordinate value; the values of x, Y are relatively accurate and the values of Y are relatively inaccurate; said Y isrRed luminance value of, the YgGreen luminance value of, the YbAnd said Y and said blue luminance value ofwIs relatively inaccurate; because the accuracy of the color coordinate values measured by the light gun is higher than the absolute values of the brightness, the tristimulus values and the like measured by the light gun. Therefore, the color coordinates and brightness values of the four colors of red, green, blue and white are measured.
Step 2: and calculating the proportion of red, green and blue 3 colors in white by using the color coordinate values, namely the numerical values of r, g and b, wherein the formula is as follows:
Figure GDA0002816907490000091
then, the brightness ratio r of red, green and blue 3 is calculatedy，gy，byThe formula is:
Figure GDA0002816907490000092
Figure GDA0002816907490000093
Figure GDA0002816907490000094
and step 3: the luminance value Y 'of white color was fitted by the least square method'wA value;
for example, in the least squares method, the luminance value variance formula is:
(Yr-ry Y’w)2+(Yg-gy Y’w)2+(Yb-byY’w)2+(Yw-Y’w)2；
deriving the above formula and making the derivative be 0 to obtain Y 'with the minimum variance'w，
Figure GDA0002816907490000095
And 4, step 4: with the fitted white luminance value Y'wCalculating fitted three-color luminance values Y 'of red, green and blue'r,Y’g,Y’bThe Y ' r, Y ' g and Y ' b are three-color brightness values of red, green and blue which are calculated by fitting, and are more accurate than the brightness values directly measured by an optical gun, so that the three-color brightness values are marked to be distinguished, and the formula is as follows:
Y’r＝rY’w；
Y’g＝gY’w；
Y’b＝bY’w；
and 5: calculating the tristimulus values of the red, the green and the blue according to the fitted three-color brightness values of the red, the green and the blue and the measured coordinates of the red, the green and the blue, wherein the formula is as follows:
Figure GDA0002816907490000101
Yc＝Y′c
Figure GDA0002816907490000102
c, respectively taking three colors of r, g and b, wherein the three colors of r, g and b correspondingly represent three colors of red, green and blue;
according to the three-color tristimulus values calculated by the formula, a whole-screen three-color tristimulus value matrix can be formed:
Figure GDA0002816907490000103
s102: replacing the new LED display module and reading back the three-color tristimulus value matrix M of point-by-point chromaticity correction of the modulem；
The new LED display module is replaced, and a three-color tristimulus value matrix M of point-by-point chromaticity correction of the module is read backmBefore, still include:
storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module for providing the tristimulus value matrix M for point-by-point chromaticity correction of the read-back modulem。
And the new LED display module is replaced, and a three-color tristimulus value matrix of point-by-point chromaticity correction of the module is read back, specifically, a target red, green and blue tristimulus value matrix set when the point-by-point chromaticity correction is carried out during the production of the module is stored in a memory on the LED display module. The new LED display module is replaced, and the red, green and blue tristimulus value matrix M is read back from the memory in the replaced LED display modulem。
Storing the corrected three-color tristimulus values on the LED display module; red, green, blue, white brightness values and color coordinate values; the stored values include being stored in the form of luminance values and color coordinate values; the correction data change matrix T is stored in the form of a tristimulus value matrix.
S104: according to LThree-color tri-stimulus value matrix M of ED display screen bodysAnd the three-color tristimulus value matrix M of the LED display module which is updated and updatedmCalculating a correction data change matrix T; three-color tristimulus value matrix M according to LED display screensAnd three-color tristimulus value matrix M of replaced LED display modulemThe method for calculating the correction data change matrix T comprises the following calculation formula:
Figure GDA0002816907490000111
Yc＝Y′c
Figure GDA0002816907490000112
c, respectively taking r, g and b colors; the r, g and b three colors correspondingly represent red, green and blue colors;
according to the three-color tristimulus values calculated by the formula, a whole-screen three-color tristimulus value matrix can be formed:
Figure GDA0002816907490000113
Figure GDA0002816907490000114
in the above formula
Figure GDA0002816907490000115
Is MmThe inverse matrix of (c). In the above formula, T is the correction data change matrix. The M issAnd obtaining a three-color tristimulus value matrix of the LED display screen.
S106: calculating to obtain a changed correction data matrix of each pixel point according to the correction data change matrix T and the correction data matrix of each pixel point on the updated LED display module;
LEd, storing the correction data of each pixel point in the module in a memory on the display module, wherein the correction data of each pixel point comprises 9 coefficients and can form 1 matrix of 3x3, namely, each pixel point on the module corresponds to 1 matrix Cp：
Figure GDA0002816907490000116
In the above formula, the subscript P represents Pixel, and Chinese is a Pixel;
the chroma correction algorithm formula is as follows:
Figure GDA0002816907490000121
where (R, G, B) is the pixel RGB color value before the chroma correction and (R ', G ', B ') is the pixel RGB color value after the chroma correction. Thus with CgrFor example, CgrThe correction coefficient is a correction coefficient in which green color before correction acts on red color after correction, and other such values are sequentially estimated.
The method for obtaining the corrected matrix through calculation according to the correction data change matrix T and the correction data matrix of each pixel point on the updated LED display module comprises the following steps of;
applying T to correction data C for each pixel of the update modulepAnd, such that:
C′p＝CpT
obtaining the correction data matrix C 'after the change of the pixel points'p。
Then, after the correction data is changed, the calculation formula of the three-color tristimulus value matrix of the new module is replaced by:
Figure GDA0002816907490000122
in the above formula MpAnd CpAnd correcting the front three-color tristimulus value matrix and the chromaticity correction data matrix point by point for any pixel point on the LED module.
Figure GDA0002816907490000123
Represents MmThe inverse matrix of (c).
S108: and performing point-by-point chromaticity correction on each pixel on the replaced new LED module by using the obtained correction coefficient matrix after the change.
For any input image color value (R, G, B), the calculation formula of the X, Y, Z tristimulus values output on the whole LED display screen is as follows:
Figure GDA0002816907490000124
and the calculation formula of the XYZ tristimulus values output on the replaced LED module is as follows:
Figure GDA0002816907490000125
in the above formula MpAnd CpAnd correcting the front three-color tristimulus value matrix and the chromaticity correction data matrix point by point for any pixel point on the LED module. R, G, B represent image pixel color values.
Namely, for any same input image pixel color values (R, G, B), the X, Y and Z tristimulus values output on the whole LED display screen and the replaced LED module are the same.
Referring to fig. 2, an embodiment of the invention provides a point-by-point calibration apparatus 22 for an LED display screen, including:
the collecting module 12 is used for collecting the brightness value and the color coordinate value of the LED display screen to obtain a three-color tristimulus value matrix M of the LED display screensAs a correction data conversion target value;
a processor 14 for reading back a tristimulus value matrix M of the module point-by-point chromaticity correctionm(ii) a Forming a point-by-point correction instruction of the LED display screen;
a matrix calculation module 18 for calculating a tristimulus value matrix M of three colors of the LED display screensAnd replacing three-color tristimulus value moment of new LED display moduleMatrix MmCalculating a correction data change matrix T; the correction data matrix updating module is also used for calculating and obtaining a changed correction data matrix of each pixel point according to the correction data change matrix T and the correction data matrix of each pixel point on the updated LED display module;
the correction processing module 16 is used for performing point-by-point chromaticity correction on each pixel on the replaced and new LED module by using the obtained changed correction coefficient matrix;
a transceiver module 10 for correcting the chromaticity of the module by pointmThe correction data change matrix T is used for exchanging the correction data matrix of each pixel point on the LED display module, and data interaction is carried out among the storage module, the calculation module and/or the processor; and uploading the data of point-by-point chromaticity correction of each pixel on the updated LED display module by the obtained changed correction coefficient matrix to the LED display screen so as to finish the correction of the area to be corrected of the LED display screen.
The storage module 20 is used for storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during production; three-color tristimulus value matrix M for providing point-by-point chromaticity correction of the read-back modulem。
Specifically, the acquisition module 12 acquires a tristimulus value matrix M of the three colors of the LED display screensAnd is sent to the processor 14 via the transceiver module 10; the new LED display module is replaced, and the processor 14 reads back the three-color tristimulus value matrix M of point-by-point chromaticity correction of the modulem(ii) a The matrix calculation module 18 calculates a tristimulus value matrix M of the LED display screen according to the three colorssAnd three-color tristimulus value matrix M of replaced LED display modulemCalculating a correction data change matrix T; calculating to obtain a changed correction data matrix of each pixel point according to the correction data change matrix T and the correction data matrix of each pixel point on the updated LED display module; to the processor 14 via the transceiver module 10; the processor 14 sends the correction processing module 16 to use the obtained changed correction coefficient matrix to update each image on the LED display moduleThe pixels are corrected for chromaticity point by point.
The embodiment of the invention also provides a point-by-point correction system for the LED display screen, which comprises the following steps:
the collecting module 12 is used for collecting the brightness value and the color coordinate value of the LED display screen to obtain a three-color tristimulus value matrix M of the LED display screensAs a correction data conversion target value;
a processor 14 for reading back a tristimulus value matrix M of the module point-by-point chromaticity correctionm(ii) a Forming a point-by-point correction instruction of the LED display screen;
a matrix calculation module 18 for calculating a tristimulus value matrix M of three colors of the LED display screensAnd replacing three-color tristimulus value matrix M of new LED display modulemCalculating a correction data change matrix T; the correction data matrix updating module is also used for calculating and obtaining a changed correction data matrix of each pixel point according to the correction data change matrix T and the correction data matrix of each pixel point on the updated LED display module;
the correction processing module 16 is used for performing point-by-point chromaticity correction on each pixel on the replaced and new LED module by using the obtained changed correction coefficient matrix;
a transceiver module 10 for correcting the chromaticity of the module by pointmThe correction data change matrix T is used for exchanging the correction data matrix of each pixel point on the LED display module, and data interaction is carried out among the storage module, the calculation module and/or the processor; and uploading the data of point-by-point chromaticity correction of each pixel on the updated LED display module by the obtained changed correction coefficient matrix to the LED display screen so as to finish the correction of the area to be corrected of the LED display screen.
The storage module 20 is used for storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during production; three-color tristimulus value matrix M for providing point-by-point chromaticity correction of the read-back modulem。
An embodiment of the present invention further provides a machine-readable storage medium, which stores machine-executable commands, and when the machine-readable storage medium is called and executed by a processor, the machine-executable commands implement the point-by-point correction method for the LED display screen according to any one of the above embodiments.
The system/computer device integrated components/modules/units, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
In the several embodiments provided in the present invention, it should be understood that the disclosed system and method may be implemented in other ways. For example, the system embodiments described above are merely illustrative, and for example, the division of the components is only one logical division, and other divisions may be realized in practice.
In addition, each functional module/component in each embodiment of the present invention may be integrated into the same processing module/component, or each module/component may exist alone physically, or two or more modules/components may be integrated into the same module/component. The integrated modules/components can be implemented in the form of hardware, or can be implemented in the form of hardware plus software functional modules/components.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention are capable of being embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. A point-by-point correction method for an LED display screen is characterized by comprising the following steps:
acquiring a three-color tri-stimulus value matrix of the LED display screen as a correction data conversion target value;
replacing the new LED display module, and reading back a three-color tristimulus value matrix of point-by-point chromaticity correction of the module;
calculating a correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the updated LED display module;
calculating to obtain a changed correction data matrix of each pixel point according to the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module;
performing point-by-point chromaticity correction on each pixel on the updated LED module by using the obtained correction coefficient matrix after the change;
the method for acquiring the three-color tristimulus value matrix of the LED display screen as the correction data conversion target value comprises the following steps:
respectively measuring the brightness values and color coordinate values of the red, green, blue and white of the whole screen by using a cursor gun;
performing fitting calculation by using the brightness values and color coordinate values of red, green, blue and white;
the method for reducing the measurement error of the tristimulus values of the red, the green and the blue colors by performing fitting calculation by using the brightness values and the color coordinate values of the red, the green, the blue and the white colors comprises the following steps:
step 1: the brightness and color coordinate values obtained by measurement are respectively set as follows:
red is (Y)r，xr，yr)；
Green is (Y)g，xg，yg)；
Blue is (Y)b，xb，yb)；
White is (Y)w，xw，yw)；
Said Y isrIs a red luminance value, said YgFor green brightness value of said YbIs a blue luminance value, said YwIs a white luminance value, said (x)r，yr) Is a red coordinate value, said (x)g，yg) Is a green coordinate value, (x)b，yb) Is a blue coordinate value, (x)w，yw) Is a white coordinate value; what is needed isThe values of x and y are relatively precise; said Y isrRed luminance value of, the YgGreen luminance value of, the YbAnd said Y and said blue luminance value ofwIs relatively inaccurate; in the white color, the proportions of red, green and blue are r, g and b respectively, and then the step 2 is carried out;
step 2: the proportion of 3 colors of red, green and blue in white, namely the numerical values of r, g and b, is calculated by using relatively accurate color coordinate values, and the formula is as follows:
Figure FDA0002835757910000021
then, the brightness ratio r of red, green and blue 3 is calculatedy，gy，byThe formula is:
Figure FDA0002835757910000022
Figure FDA0002835757910000023
Figure FDA0002835757910000024
and step 3: the luminance value Y 'of white color was fitted by the least square method'wThe value, luminance value variance formula is:
(Yr-rY’w)2+(Yg-gY’w)2+(Yb-bY’w)2+(Yw-Y’w)2
deriving the above formula and making the derivative be 0 to obtain Y 'with the minimum variance'wThe formula is as follows:
Figure FDA0002835757910000025
and 4, step 4: with the fitted white luminance value Y'wCalculating fitted three-color luminance values Y 'of red, green and blue'r，Y’g，Y’bThe Y ' r, Y ' g and Y ' b are the red, green and blue three-color brightness values calculated by fitting, are more accurate than the direct measurement of the light gun, and are distinguished by adding a superscript, and the formula is as follows:
Y’r＝rY’w
Y’g＝gY’w
Y’b＝bY’w；
and 5: calculating the tristimulus values of the red, the green and the blue according to the fitted three-color brightness values of the red, the green and the blue and the measured coordinates of the red, the green and the blue, wherein the formula is as follows:
Figure FDA0002835757910000026
Yc＝Y′c
Figure FDA0002835757910000027
c, respectively taking r, g and b colors;
according to the three-color tristimulus values calculated by the formula, a whole-screen three-color tristimulus value matrix can be formed:
Figure FDA0002835757910000031
the M issAnd obtaining a three-color tristimulus value matrix of the LED display screen.
2. The method for correcting the LED display screen dot by dot according to claim 1, wherein the calculation formula for calculating the correction data change matrix according to the tristimulus values matrix of the LED display screen body and the tristimulus values matrix of the replaced LED display module is as follows:
Figure FDA0002835757910000032
in the above formula, the three-color tristimulus value matrix of the replaced LED display module is Mm；
Figure FDA0002835757910000033
Is MmThe inverse matrix of (d); t is the correction data change matrix; the M issAnd obtaining a three-color tristimulus value matrix of the LED display screen.
3. The method for correcting the LED display screen point by point according to claim 2, wherein the method for calculating the corrected data matrix after the change of each pixel point according to the corrected data change matrix and the corrected data matrix of each pixel point on the updated LED display module comprises;
storing correction data of each pixel point in the module in a memory on the LED display module, wherein the correction data of each pixel point comprises 9 coefficients and can form 1 3x3 matrix, namely, each pixel point on the module corresponds to 1 matrix Cp：
Figure FDA0002835757910000034
In the above formula, the subscript P represents a pixel;
the method for obtaining the corrected matrix through calculation according to the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module comprises the following steps of;
the correction data change matrix is T, and the T is applied to the correction data C of each pixel of the updating modulepAnd, such that:
C′p＝CpT
obtaining the correction data matrix C 'after the change of the pixel points'p；
Then, after the correction data is changed, the calculation formula of the three-color tristimulus value matrix of the new module is replaced by:
Figure FDA0002835757910000041
in the above formula MpAnd CpAnd correcting the front three-color tristimulus value matrix and the chromaticity correction data matrix point by point for any pixel point on the LED module.
4. The method for correcting the chromaticity of each pixel of the LED display screen point by point according to claim 3, wherein the method for correcting the chromaticity of each pixel of the updated LED module point by point using the obtained matrix of the changed correction coefficients comprises:
for any input image color value (R, G, B), the calculation formula of XYZ tristimulus values output on the entire LED display screen is:
Figure FDA0002835757910000042
and the calculation formula of the XYZ tristimulus values output on the replaced LED module is as follows:
Figure FDA0002835757910000043
in the above formula MpAnd CpAnd correcting the front three-color tristimulus value matrix and the chromaticity correction data matrix point by point for any pixel point on the LED module.
5. The method for correcting the LED display screen point by point according to claim 4, wherein before the new LED display module is replaced and the tristimulus value matrix of the three colors of the module for correcting the chromaticity point by point is read back, the method further comprises the following steps:
and storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during module production for providing the tristimulus value matrix for the point-by-point chromaticity correction of the read-back module.
6. A point-by-point correction device of an LED display screen is used for realizing the point-by-point correction method of the LED display screen according to any one of claims 1 to 5, and is characterized by comprising the following steps:
the acquisition module is used for acquiring the brightness value and the color coordinate value of the LED display screen, acquiring a three-color tristimulus value matrix of the LED display screen and taking the three-color tristimulus value matrix as a correction data conversion target value;
the processor is used for reading back a three-color tristimulus value matrix of the module point-by-point chromaticity correction; forming a point-by-point correction instruction of the LED display screen;
the matrix calculation module is used for calculating a correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the replaced LED display module; the correction data change matrix is used for changing the correction data matrix of each pixel point on the LED display module to obtain the correction data matrix of each pixel point;
the correction processing module is used for performing point-by-point chromaticity correction on each pixel on the LED display module group which is updated by using the obtained changed correction coefficient matrix;
the receiving and sending module is used for carrying out point-by-point chromaticity correction on the three-color tristimulus value matrix, the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module, and carrying out data interaction among the storage module, the calculation module and/or the processor; uploading the obtained point-by-point chromaticity correction data of each pixel on the LED display module group which is updated by the changed correction coefficient matrix to the LED display screen so as to finish the correction of the area to be corrected of the LED display screen;
the storage module is used for storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during production; the tri-color tri-stimulus value matrix is used for providing point-by-point chromaticity correction for the read-back module.
7. A point-by-point correction system of an LED display screen is used for realizing the point-by-point correction method of the LED display screen of any one of claims 1 to 5, and is characterized by comprising the following steps:
the acquisition module is used for acquiring the brightness value and the color coordinate value of the LED display screen, acquiring a three-color tristimulus value matrix of the LED display screen and taking the three-color tristimulus value matrix as a correction data conversion target value;
the processor is used for reading back a three-color tristimulus value matrix of the module point-by-point chromaticity correction; forming a point-by-point correction instruction of the LED display screen;
the matrix calculation module is used for calculating a correction data change matrix according to the three-color tristimulus value matrix of the LED display screen body and the three-color tristimulus value matrix of the replaced LED display module; the correction data change matrix is used for changing the correction data matrix of each pixel point on the LED display module to obtain the correction data matrix of each pixel point;
the correction processing module is used for performing point-by-point chromaticity correction on each pixel on the LED display module group which is updated by using the obtained changed correction coefficient matrix;
the receiving and sending module is used for carrying out point-by-point chromaticity correction on the three-color tristimulus value matrix, the correction data change matrix and the correction data matrix of each pixel point on the updated LED display module, and carrying out data interaction among the storage module, the calculation module and/or the processor; uploading the obtained point-by-point chromaticity correction data of each pixel on the LED display module group which is updated by the changed correction coefficient matrix to the LED display screen so as to finish the correction of the area to be corrected of the LED display screen;
the storage module is used for storing a target red, green and blue tristimulus value matrix set during point-by-point chromaticity correction in the LED display module during production; the tri-color tri-stimulus value matrix is used for providing point-by-point chromaticity correction for the read-back module.
8. A storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, perform the method steps of any of claims 1-5.
CN201911068223.0A 2019-11-05 2019-11-05 Point-to-point correction method, device and system for LED display screen and storage medium Active CN110660352B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911068223.0A CN110660352B (en) 2019-11-05 2019-11-05 Point-to-point correction method, device and system for LED display screen and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911068223.0A CN110660352B (en) 2019-11-05 2019-11-05 Point-to-point correction method, device and system for LED display screen and storage medium

Publications (2)

Publication Number Publication Date
CN110660352A CN110660352A (en) 2020-01-07
CN110660352B true CN110660352B (en) 2021-03-02

Family

ID=69043144

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911068223.0A Active CN110660352B (en) 2019-11-05 2019-11-05 Point-to-point correction method, device and system for LED display screen and storage medium

Country Status (1)

Country Link
CN (1) CN110660352B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113496683B (en) * 2020-04-01 2022-10-21 敦泰电子股份有限公司 Display adjustment method of vehicle display
CN111653244B (en) * 2020-06-30 2021-11-30 京东方科技集团股份有限公司 Brightness adjusting method
CN111754928B (en) * 2020-07-31 2021-07-23 卡莱特云科技股份有限公司 Display screen layered correction method and device
CN113936589B (en) * 2021-10-26 2022-09-30 卡莱特云科技股份有限公司 Virtual pixel brightness and chrominance correction method and device
CN113936590B (en) * 2021-10-26 2022-09-16 卡莱特云科技股份有限公司 Brightness correction method and device based on virtual pixel LED display screen and display system
CN115662342A (en) * 2022-11-03 2023-01-31 长春希达电子技术有限公司 LED display screen correction method capable of freely setting color gamut adjustment function
CN117037652A (en) * 2023-08-22 2023-11-10 北京凯视达科技股份有限公司 Point-to-point correction method and device for display screen and computer equipment

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7362357B2 (en) * 2001-08-07 2008-04-22 Signature Research, Inc. Calibration of digital color imagery
US7692666B1 (en) * 2004-04-07 2010-04-06 Adobe Systems Incorporated Constructing color profile for parameterized image color space
US7218358B2 (en) * 2004-06-15 2007-05-15 Coretronic Corporation Method and apparatus for calibrating color temperature of color display devices
CN101527108B (en) * 2009-04-17 2012-12-12 天津光电星球显示设备有限公司 Measuring method for colorimetric parameters of LED display screen
CN101866621B (en) * 2010-06-03 2016-01-20 北京中庆微数字设备开发有限公司 A kind of LED display corrective system and method
WO2012073342A1 (en) * 2010-11-30 2012-06-07 Ｎｅｃディスプレイソリューションズ株式会社 Correction device for display device and correction method for display device
US9251761B2 (en) * 2011-01-13 2016-02-02 Sharp Kabushiki Kaisha Gray-scale correction method for display device, and method of producing display device
CN102402937B (en) * 2011-12-15 2014-02-26 深圳市华星光电技术有限公司 Color adjustment device, color adjustment method and display
CN102402944B (en) * 2011-12-20 2014-11-12 深圳市奥拓电子股份有限公司 Point-by-point correcting system and point-by-point correcting method for LED display screen
CN103117037B (en) * 2013-02-19 2015-07-29 深圳市摩西尔电子有限公司 A kind of full color video display correction process method
CN106531060B (en) * 2016-11-16 2019-02-26 西安诺瓦电子科技有限公司 The bearing calibration of LED display bright chroma and device
CN107799081B (en) * 2017-11-08 2019-10-22 武汉华星光电半导体显示技术有限公司 Gamma corrects system and its bearing calibration
CN108682365B (en) * 2018-04-18 2022-02-18 武汉精测电子集团股份有限公司 OLED color spot detection and repair integrated system and method
CN109461418B (en) * 2018-12-17 2021-03-23 惠科股份有限公司 Method and device for converting three-color data into four-color data
CN109637434A (en) * 2018-12-29 2019-04-16 深圳市奥拓电子股份有限公司 Bearing calibration, correction system and the machine readable storage medium of mosaic display screen

Also Published As

Publication number Publication date
CN110660352A (en) 2020-01-07

Similar Documents

Publication Publication Date Title
CN110660352B (en) Point-to-point correction method, device and system for LED display screen and storage medium
CN104882098B (en) Method for correcting image and imaging sensor based on LED mosaic display screens
CN103067743B (en) Quick adjustment system and method for liquid crystal display television
CN102611897B (en) Method and system for carrying out vision perception high-fidelity transformation on color digital image
CN106791759B (en) The bearing calibration of medical display color uniformity and correction system
CN105096890B (en) A kind of white balance method of four color pixels system
CN108492776A (en) A kind of AMOLED screens brightness disproportionation intelligent external optical compensation method
CN111429827A (en) Display screen color calibration method and device, electronic equipment and readable storage medium
CN112289250B (en) Compensation method and device of display module
CN115841794B (en) OLED display screen detection method and device, display image processing method and device
CN111161683B (en) Image processing method, image processor and display device
CN106448525A (en) System and method for measuring color uniformity of medical display
CN115346464A (en) Display compensation data setting method, display compensation method and driving chip
CN105306917B (en) Low gray level white balance control method, control system and display
WO2024000465A1 (en) Method and apparatus for generating color mapping table, method and apparatus for correcting color mapping table, and medium and device
WO2022120799A1 (en) Image processing method and apparatus, electronic device, and storage medium
CN109119046B (en) Adjusting system and adjusting method for gray scale brightness and memory
CN110514303B (en) A detection method for display uniformity and gray balance for soft proofing
CN109410889B (en) White balance adjusting method and device and electronic equipment
CN117746808A (en) Display calibration method, display panel calibration system and display device
CN110880306B (en) Color restoration correction method for medical display
CN111739480B (en) Panel uniformity correction method
CN1543227B (en) A correction method for chromaticity space transformation of flat panel display
JP2011188319A (en) Color correction method and color correction device
JP2017146513A (en) Adjustment method and adjustment device for liquid crystal display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information
CB02 Change of applicant information

Address after: 518000 1805, tower 2, Shenye Jinyuan Building, No.112, Qingshuihe 1st Road, Qingshuihe community, Luohu District, Shenzhen City, Guangdong Province

Applicant after: SHENZHEN AOTO ELECTRONICS Co.,Ltd.

Address before: 518000 joint headquarters building, No. 63 High-tech Zone, Nanshan District Xuefu Road, Shenzhen City, Guangdong Province, 9

Applicant before: SHENZHEN AOTO ELECTRONICS Co.,Ltd.

GR01 Patent grant
GR01 Patent grant