CN109326264B - Brightness Demura method and system of liquid crystal display module - Google Patents

Brightness Demura method and system of liquid crystal display module Download PDF

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CN109326264B
CN109326264B CN201811563176.2A CN201811563176A CN109326264B CN 109326264 B CN109326264 B CN 109326264B CN 201811563176 A CN201811563176 A CN 201811563176A CN 109326264 B CN109326264 B CN 109326264B
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gray
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crystal display
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CN109326264A (en
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黄建军
刘世仁
李桐
黄敬雄
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Shenzhen University
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—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
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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Abstract

The invention discloses a brightness Demura method of a liquid crystal display module, which comprises the following steps: setting gray values of a plurality of input signals, respectively obtaining brightness values displayed by the input signals on the liquid crystal display module, solving coefficients of a gray-brightness piecewise conversion function through fitting according to the gray values of the input signals and the corresponding brightness values, setting gray values of gray scales to be corrected input by the liquid crystal display module, obtaining target brightness values output by the gray scales to be corrected according to a gamma relation, obtaining compensation data corresponding to the gray scales to be corrected according to the target brightness values, the gray-brightness piecewise conversion function and the gray scales to be corrected, and correcting the brightness values output by the liquid crystal display module by using the compensation data to enable the brightness values output by the liquid crystal display module to be the target brightness values, thereby eliminating Mura of the liquid crystal display module. Because the gray scale-brightness piecewise conversion function can more accurately represent the relation between the actual input gray scale and the output brightness of the liquid crystal display module, the effect of eliminating the Mura of the liquid crystal display module by adopting the method is superior to the prior art.

Description

Brightness Demura method and system of liquid crystal display module
Technical Field
The invention relates to the technical field of display, in particular to a brightness Demura method and system of a liquid crystal display module.
Background
With the development of liquid crystal display technology, liquid crystal displays have been widely used in various fields of life. The liquid crystal display module is a main component of the liquid crystal display, and various display non-uniformity phenomena (Mura) occur in the liquid crystal display module due to reasons such as materials, production processes and the like in the production process. The existing method for eliminating the uneven imagination of the display of the liquid crystal display module is a Demura method (a method for eliminating Mura), brightness unevenness (Mura) on the liquid crystal display module is reduced or even eliminated through brightness compensation, but the existing Demura method is difficult to meet the requirements of quality and production efficiency along with the fact that the size of the liquid crystal display module is more and more obvious.
The traditional liquid crystal display module brightness correction process is as follows: firstly, gamma correction is carried out on the liquid crystal display module, calculated gamma correction data is stored in a Flash ROM (Flash Memory) of the liquid crystal display module, then brightness Demura is carried out on the liquid crystal display module, brightness compensation data is calculated and finally stored in the Flash ROM of the liquid crystal display module, when the liquid crystal display module needs to display images, a control circuit of the liquid crystal display module controls display brightness according to a gray level value displayed by current display requirements and the Flash ROM data searched by a table look-up method, and correction of the display brightness is completed.
For the brightness of the liquid crystal display module, the method adopted by the existing product is as follows: firstly, collecting a brightness image of the liquid crystal display module, then fitting the relation between the gray scale and the brightness of the liquid crystal display module by using a single-form function, calculating brightness compensation data, storing the data into a Flash ROM of the liquid crystal display module, and finally controlling the liquid crystal display module to display the brightness image, wherein the liquid crystal display module utilizes the current compensation data to correct the brightness display brightness.
In the traditional brightness correction process, gamma correction is firstly carried out on the liquid crystal display module by using gamma correction equipment, and then Mura of the display module is eliminated by using brightness Demura equipment. When the gamma correction effect is not good, the gamma value is larger or smaller, which affects the following Demura process, resulting in poor Mura elimination effect, or the gamma value reaches the requirement after the gamma correction, but the gamma value is changed in the Demura process of the liquid crystal display module, resulting in the gamma value not meeting the requirement, and thus the gamma correction is carried out again.
The existing Demura method eliminates the poor effect of the Mura of the liquid crystal display module, so that the product quality can not meet the requirement, and the condition of performing gamma correction again appears after Demura, thereby reducing the production efficiency. Therefore, the Mura eliminating effect of the liquid crystal display module in the prior art is influenced by the size of the gamma value and the gamma value is not in accordance with the requirement due to the Demura, so that the quality and the production efficiency of the display module product are reduced.
Disclosure of Invention
The invention mainly aims to provide a brightness Demura method and system of a liquid crystal display module, which are used for solving the technical problem that the effect of eliminating the Mura of the liquid crystal display module is poor in the existing method.
In order to achieve the above object, a first aspect of the present invention provides a brightness Demura method for a liquid crystal display module, the method comprising:
setting gray values of a plurality of input signals, and respectively acquiring brightness values displayed by the input signals in the liquid crystal display module;
solving a coefficient of a gray-brightness piecewise conversion function through fitting according to the gray values of the plurality of input signals and the corresponding brightness values, wherein the gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module;
setting gray values of all input gray scales to be corrected of the liquid crystal display module, and acquiring target brightness values output by the gray scales to be corrected according to a gamma relation;
obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray-brightness piecewise conversion function and the gray scale to be corrected;
and correcting the brightness value output by the liquid crystal display module by using the compensation data to enable the brightness value output by the liquid crystal display module to be a target brightness value.
The invention provides a brightness Demura system of a liquid crystal display module, which comprises:
the first setting module is used for setting gray values of a plurality of input signals and respectively acquiring brightness values displayed by the input signals on the liquid crystal display module;
the solving module is used for solving the coefficient of a gray-brightness piecewise conversion function through fitting according to the gray values of the plurality of input signals and the corresponding brightness values, wherein the gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module;
the second setting module is used for setting gray values of all input gray scales to be corrected of the liquid crystal display module and acquiring target brightness values output by the gray scales to be corrected according to a gamma relation;
the processing module is used for obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray scale-brightness piecewise conversion function and the gray scale to be corrected;
and the correction module is used for correcting the brightness value output by the liquid crystal display module by using the compensation data so as to enable the brightness value output by the liquid crystal display module to be a target brightness value.
In the technical scheme, the gray-brightness piecewise conversion function can be used for more accurately representing the relation between the gray value of the actual input signal of the liquid crystal display module and the output brightness value, and the compensation data can be accurately calculated according to the gray-brightness piecewise conversion function, so that the elimination effect of eliminating the Mura of the liquid crystal display module is improved, and the elimination effect is superior to that of the prior art. According to the technical scheme, the target brightness value of the gray scale output to be corrected is set according to the gamma relation, the gamma value of the liquid crystal display module after Demura meets the requirement, the condition that gamma correction needs to be carried out again does not occur, and the generation efficiency is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a brightness Demura method for a liquid crystal display module according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a brightness Demura method of a liquid crystal display module according to another embodiment of the present invention;
FIG. 3 is a diagram illustrating the relationship between the LCD module and Gamma;
FIG. 4 is a schematic structural diagram of a brightness Demura system of a liquid crystal display module according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a brightness Demura system of a liquid crystal display module according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a computing device according to another embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical problem of poor effect of eliminating the Mura of the liquid crystal display module in the prior art is solved. In order to solve the above technical problems, the present invention provides a brightness Demura method for a liquid crystal display module.
Referring to fig. 1, a schematic flow chart of a brightness Demura method of a liquid crystal display module according to an embodiment of the present invention is shown, where the brightness Demura method of the liquid crystal display module specifically includes:
step 101, setting gray values of a plurality of input signals, and respectively obtaining brightness values displayed by the input signals in the liquid crystal display module.
Specifically, gray values of a plurality of signals are set, the signals are input into the liquid crystal display module, the liquid crystal display module displays the signals, the brightness value of the signals displayed by the liquid crystal display module is obtained by the brightness value obtaining device, and the brightness value displayed by the liquid crystal display module corresponds to the gray values of the input signals one to one.
The input signal is the input signal of all pixels, each pixel input signal corresponds to one signal component in each input signal, and the gray value of the input signal is the specific gray value of the input signal, and the gray value is known.
And 102, solving a coefficient of a gray-brightness piecewise conversion function through fitting according to the gray values of the plurality of input signals and the corresponding brightness values, wherein the gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module.
Specifically, the gray scale values and corresponding luminance values of a plurality of input signals are substituted into a gray scale-luminance piecewise conversion function, and each coefficient of the gray scale-luminance piecewise conversion function is calculated by a fitting method, wherein the gray scale-luminance piecewise conversion function is expressed by a polynomial function at a low gray scale and is expressed by an exponential function at a high gray scale, and the gray scale-luminance piecewise conversion function is:
Figure BDA0001913809740000051
where (x, y) is the two-dimensional coordinate of each input signal, ak(x，y)、b0(x, y) and b1(x, y) is a coefficient, K is 0, 1, 2,.. K, G is a segmentation point of the gray-to-luminance segmentation conversion function, K is the order of a polynomial, G (x, y) is a gray value of an input signal, f (G (x, y); x, y) is an output luminance value;
the resolution of the liquid crystal display module is nxm, the two-dimensional coordinates (x, y) of each input signal of the liquid crystal display module are respectively as follows: the gray-to-brightness piecewise conversion function represents the relation between the gray value g (x, y) of the input signal and the output brightness value f (g (x, y); x, y), and when the gray value of the input signal belongs to a middle-low gray level section, the relation between g (x, y) and f (g (x, y); x, y) is represented by a polynomial function positioned above in the gray-to-brightness piecewise conversion function; when the gray value of the input signal belongs to a high gray segment, the relationship between g (x, y) and f (g (x, y); x, y) is expressed by an exponential function located below in the gray-to-luminance piecewise conversion function.
It should be noted that, in each liquid crystal display module, the coefficients of the gray-to-brightness piecewise conversion function solved by fitting according to the gray value of the input signal and the corresponding brightness value are different, and the gray-to-brightness piecewise conversion function solved according to the data of the liquid crystal display module can more accurately represent the relationship between the gray value of the input signal of the liquid crystal display module and the output brightness value.
103, setting gray values of the gray scales to be corrected input by the liquid crystal display module, and acquiring target brightness values output by the gray scales to be corrected according to the gamma relation.
Specifically, gray values of S gray scales to be corrected are set, and corresponding output target brightness values of the S gray scales to be corrected are obtained according to the gamma relation between the gray values of the gray scales to be corrected and the output target brightness values;
the gamma relationship is:
Figure BDA0001913809740000061
wherein D isiIs the gray value of the ith gray scale to be corrected, LiIs the ith target brightness value, i 1, 2maxThe maximum brightness value L displayed by the liquid crystal display moduleminThe minimum brightness value displayed by the liquid crystal display module is gamma value of the liquid crystal display module, and gamma is more than or equal to 0 and less than or equal to 2.4.
It should be noted that, the gray scale to be corrected is a gray scale value of the input signal, Gamma (Gamma) is a physical property of the liquid crystal display module, when the input signal and the output signal displayed by the liquid crystal display module conform to a Gamma curve, the display of the liquid crystal display module conforms to the visual characteristics of human eyes, and the human eyes are comfortable when observing the display of the liquid crystal display module. Namely, when the relation curve of the gray scale value of the gray scale to be corrected and the output target brightness value of the liquid crystal display module meets the Gamma curve, the liquid crystal display module displays the gray scale meeting the visual characteristics of human eyes, and the human eyes are comfortable when observing the display of the display equipment. The gamma value normally ranges from (0, 2.7).
And 104, obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray scale-brightness segmentation conversion function and the gray scale to be corrected.
The compensation data corresponding to the gray scale to be corrected is solved by selecting a specific function relation in a gray-brightness piecewise conversion function according to the specific gray scale value of the gray scale to be corrected, wherein the gray scale to be corrected corresponds to the compensation data. And solving different compensation data according to different gray values of the gray scale to be corrected. And storing a compensation data table comprising a plurality of compensation data of the gray scales to be corrected in the liquid crystal display module.
And 105, correcting the brightness value output by the liquid crystal display module by using the compensation data to enable the brightness value output by the liquid crystal display module to be a target brightness value.
For the input signal of the liquid crystal display module, the compensation data corresponding to the gray value in the compensation data table can be searched according to the specific gray value of the input signal. Therefore, the brightness value output by the signal is corrected according to the compensation data, so that the brightness value output by the liquid crystal display module is a target brightness value. And adjusting the brightness value output by the signal to be a target brightness value corresponding to the input signals with the same gray scale value, thereby eliminating the Mura phenomenon of the liquid crystal display module.
It is seen from the brightness Demura method of the liquid crystal display module that the method corrects the output brightness value of the liquid crystal display module according to the compensation data to make the output brightness value of the liquid crystal display module be the target brightness value, thereby eliminating the Mura of the liquid crystal display module. The gray-brightness piecewise conversion function in the method represents the brightness conversion relation of the liquid crystal display module, the gray-brightness piecewise conversion function coefficient is calculated according to the gray values and the output brightness values of a plurality of input signals of the liquid crystal display module, the gray-brightness piecewise conversion function can more accurately represent the relation between the gray values and the output brightness values of the actual input signals of the liquid crystal display module, and the compensation data can be accurately calculated according to the gray-brightness piecewise conversion function, so that the elimination effect of eliminating the Mura of the liquid crystal display module is improved.
As shown in fig. 2, fig. 2 is a schematic flow chart of a brightness Demura method of a liquid crystal display module according to another embodiment of the present invention, the method including:
step 201, setting gray values of a plurality of input signals, and respectively obtaining brightness values displayed by the input signals in the liquid crystal display module.
Specifically, gray values of the N signals are set, the N signals are input into the liquid crystal display module, the liquid crystal display module displays the signals, the brightness value of the signals displayed by the liquid crystal display module is obtained through the brightness value obtaining device, and the obtained N brightness values correspond to the gray values of the N signals one to one.
The relationship of the gray values of the N signals set satisfies the following: g is not less than 01(x，y)＜g2(x，y)＜…＜
Figure BDA0001913809740000081
Wherein the content of the first and second substances,
Figure BDA0001913809740000082
Figure BDA0001913809740000083
inputting the N signals into the liquid crystal display module in sequence, sequentially acquiring the brightness value of the signal displayed by the liquid crystal display module, and acquiring the corresponding N brightness values:
Figure BDA0001913809740000084
for a commonly-used 8-bit display, the gray value range of an input signal is 0-255, and N values are related to the number of solving coefficients.
Step 202, solving the coefficient of the gray-brightness piecewise conversion function by fitting according to the gray values of the plurality of input signals and the corresponding brightness values, wherein the gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module.
The gray scale values and the corresponding brightness values of the N input signals are substituted into a gray scale-brightness piecewise conversion function, and each coefficient of the gray scale-brightness piecewise conversion function is calculated by a fitting method, wherein the gray scale-brightness piecewise conversion function is shown as the following formula:
Figure BDA0001913809740000085
where (x, y) is the two-dimensional coordinate of each input signal, ak(x，y)、b0(x, y) and b1(x, y) is a coefficient, K is 0, 1, 2,.. K, G is a segmentation point of the gray-to-luminance segmentation conversion function, K is the order of a polynomial, G (x, y) is a gray value of an input signal, f (G (x, y); x, y) is an output luminance value;
specifically, the first N1Gray value of an input signal
Figure BDA0001913809740000086
And corresponding output brightness value
Figure BDA0001913809740000087
Substituting into a polynomial formula of a gray-brightness piecewise conversion function to solve the coefficient a in the polynomial functionk(x, y) and then
Figure BDA0001913809740000088
And corresponding
Figure BDA0001913809740000089
Substituting into the formula of exponential function of gray-brightness segment conversion function, and solving the coefficient b of the formula of exponential function by curve fitting method0(x, y) and b1(x, y). Solving each coefficient of the gray scale-brightness piecewise conversion function, namely solving the brightness conversion relation.
Step 203, setting gray values of the S input gray scales to be corrected of the liquid crystal display module, and acquiring target brightness values output by the S gray scales to be corrected according to the gamma relationship.
Specifically, the gray values of S gray scales to be corrected are set to be D respectively1，D2，...，DSSolving the target brightness value output by the S gray scales to be corrected according to the gamma relation: l is1，L2，...，LS。
Wherein, the gamma relationship is specifically as follows:
Figure BDA0001913809740000091
wherein D isiIs the gray value of the ith gray scale to be corrected, LiIs the ith luminance value to be corrected, i is 1, 2maxThe maximum brightness value L displayed by the liquid crystal display moduleminThe minimum brightness value displayed by the liquid crystal display module is gamma value of the liquid crystal display module, and gamma is more than or equal to 0 and less than or equal to 2.4.
Step 204, inputting the target brightness outputted corresponding to the S gray scales to be corrected into the gray-brightness piecewise conversion function, and solving the input signals corresponding to the S gray scales to be correctedThe gray-scale values, i.e. the gray-scale values at which the input signal is solved, are: gi(x，y)＝f-1(Li；x，y)，i＝1，2，...，S。
Specifically, if the gray level D of the gray level to be corrected is set1When in the range of [0, G), the gray scale D to be corrected1Corresponding target brightness value L1The polynomial formula input to the gray-to-luminance piecewise conversion function is as follows:
Figure BDA0001913809740000092
from the above equation, the gradation value g (x, y) of the input signal whose output luminance is the target luminance is solved.
If the gray value D of the gray scale to be corrected1In [ G, G ]max]Within the range, the gray scale D to be corrected1Corresponding target brightness value L1The input to the exponential function relation of the gray-scale-luminance piecewise conversion function is as follows:
Figure BDA0001913809740000093
from the above equation, the gradation value g (x, y) of the input signal whose output luminance is the target luminance is solved.
Step 205, obtaining the compensation data of the gray scale to be corrected according to the gray scale to be corrected and the gray scale value of the corresponding input signal.
Specifically, based on the gray scale to be corrected and the gray scale value of the corresponding input signal, the compensation data is calculated according to a compensation data generation formula, where the compensation data generation formula is:
ΔDi(x，y)＝gi(x，y)-Di (5)
wherein D isiG corresponding to the ith gray scale to be correctedi(x, y) is the sum of the gray-scale values of the input signal and Δ Di(x, y) is compensation data, i 1, 2.., S;
generating the compensation data Δ D of the gray scale D1 to be corrected according to the above formula1(xY), correspondingly, respectively generating the gray scales D to be corrected according to the compensation data generation formula1，D2，...，DSCorresponding compensation data Δ D1(x，y)，ΔD2(x，y)，...，ΔDS(x，y)。
Note that, the compensation data table includes: and acquiring compensation data corresponding to the gray scale to be corrected according to the gray scale value of the gray scale to be corrected. And storing the compensation data table into a Flash ROM of the display equipment according to a hardware circuit of the liquid crystal display module so as to be used for correcting the display brightness of the display equipment in the following.
It should be noted that step 204 and step 205 of the present embodiment are the refinement steps of step 104 of the previous embodiment.
And step 206, correcting the brightness value output by the liquid crystal display module by using the compensation data to make the brightness value output by the liquid crystal display module be a target brightness value.
Specifically, a correction amount is calculated based on the compensation data, and the luminance value of the output of the signal is corrected based on the correction amount.
After the output brightness value of the input signal is corrected by the correction quantity, the brightness values of the output signal are all corrected brightness, so that the image displayed by the liquid crystal display module can be observed by naked eyes of human eyes, and the display effect that Mura cannot be seen by naked eyes of human eyes can be achieved.
In the embodiment of the present invention, the two-dimensional coordinates of each signal are set to (x, y), where x has a value of 0, 1maxThe maximum value of the pixel gray scale is 255, 0 is larger than or equal to G (x, y) is smaller than or equal to 255, the dividing point G of the gray scale-brightness segmentation conversion function is set to be 200, and the order K of the polynomial function is set to be 4. The gray scale-brightness piecewise conversion function of the liquid crystal display module expressing the brightness conversion relation is as follows:
Figure BDA0001913809740000101
wherein, a0(x，y)、a1(x，y)、a2(x，y)、a3(x，y)、a4(x，y)、b0(x, y) and b1(x, y) are coefficients.
In the embodiment of the invention, the number N of the set input signals is 6, and the gray values of the input signals are respectively g1(x，y)＝0，g2(x，y)＝20，g3(x，y)＝50，g4(x，y)＝100，g5(x，y)＝200，g6The (x, y) ═ 255 is input to the liquid crystal display module in sequence, and the 6 input signals are obtained, and the 6 brightness values displayed in the liquid crystal display module are respectively f (g)1(x，y)；x，y)，f(g2(x，y)；x，y)，f(g3(x，y)；x，y)，f(g4(x，y)；x，y)，f(g5(x，y)；x，y)，f(g6(x, y); x, y). As the dividing point G of the gray-scale-brightness piecewise conversion function is 200, 0, 20, 50, 100, 200 and the corresponding display brightness value are input into the formula (a), and the coefficient a of the formula (a) is solved by adopting a least square curve fitting method0(x，y)，a1(x，y)，a2(x，y)，a3(x，y)，a4(x, y), then solving the coefficient b in the formula (b) by using a curve fitting method0(x, y) and b1(x, y). Thereby solving the expression of the gray-to-brightness piecewise conversion function.
In the embodiment of the present invention, after solving the expression of the gray-to-brightness piecewise conversion function, the process of generating the compensation data is specifically as follows: setting the value of the number S of the gray scales to be corrected to be 3, wherein the 3 gray scales to be corrected are respectively as follows: d1＝24，D2＝65，D3Inputting the value of the gray scale to be corrected into a Gamma relation formula (2), wherein the Gamma value in the formula (2) is 2.2, and the corresponding target brightness values are respectively L1，L2，L3Wherein the gray scale D to be corrected1Is in the range of [0, 200), the gray scale D to be corrected1Corresponding target brightness value L1Substituting into equation (a) yields the following equation:
Figure BDA0001913809740000111
solving the target brightness value L from the above formula by Newton iteration method1Gray value g of the input signal24(x, y), the compensation data of the gray level 24 to be corrected is:
ΔD1(x，y)＝g24(x，y)-24 (d)
to-be-corrected gray scale D2Is in the range of [0, 200), the gray scale D to be corrected2Corresponding target brightness value L2Substituting into equation (a) yields the following equation:
Figure BDA0001913809740000112
solving the target brightness value L from the above formula by Newton iteration method2Gray value g of the input signal65(x, y), the compensation data of the gray level 65 to be corrected is:
ΔD2(x，y)＝g65(x，y)-65 (f)
to-be-corrected gray scale D3At a gray scale value of [200, 255 ]]Within the range, the gray scale D to be corrected3Corresponding target brightness value L3Substituting into equation (b) yields the following equation:
Figure BDA0001913809740000121
directly solving the target brightness value L from the above formula3Gray value g of the input signal220(x, y), the compensation data of the gray level to be corrected 220 is:
ΔD3(x，y)＝g220(x，y)-220 (h)
wherein, Δ D1(x，y)，ΔD2(x，y)，ΔD3(x, y) are respectively the compensation data generated corresponding to the gray scale 24 to be corrected, the gray scale 65 to be corrected and the gray scale 220 to be corrected. The generated compensation data is converted into a data table with a corresponding format by a hardware circuit of the liquid crystal display module, and is stored in a Flash ROM for correcting the display brightness of the liquid crystal display moduleAnd (4) degree. The brightness value of the output signal can be corrected according to the compensation data table, so that the effect of eliminating the Mura of the liquid crystal display module is achieved.
In the embodiment of the invention, the gray value of the input signal of the liquid crystal display module is 100, the display signal of the liquid crystal display module is acquired by a camera, the display signal is a display image, the displayed image has bright twill, dark twill, oblique-strip-shaped black band, oblique-strip-shaped white band, vertical black band and black-block Mura, and the Mura area reaches 95%. After the method is adopted to carry out brightness Demura on the liquid crystal display module, the liquid crystal display module displays an image with a gray value of any value, and the image is observed by naked eyes without observing the Mura phenomenon of the image.
As shown in fig. 3, fig. 3 is a graph showing the relationship between the liquid crystal display module and Gamma, and fig. 3 is a graph showing that 20 Gamma values of 500 liquid crystal display modules are randomly measured after the liquid crystal display modules are processed by the brightness Demura method of the liquid crystal display module. It should be noted that the national television system committee recommends a Gamma value of 2.2, and the general industry requires a Gamma value of 2.0 to 2.4 when the gray scale of the liquid crystal display module after Demura is between 10 and 245. Table 1 shows the results of processing 500 lcd modules by the method, and the statistics on the surface and the back surface are the main Mura types, the corresponding severity and Just recognizable thresholds (JND) of the 500 lcd modules before processing, and the Mura elimination conditions after processing. The grade of Mura is measured by a JND value internationally, and the Mura elimination index meets the requirement when the JND value is less than 1.
TABLE 1
Figure BDA0001913809740000131
It should be noted that the brightness Demura method of the liquid crystal display module can also be used for brightness Demura of other display devices.
As seen from the brightness Demura method of the lcd module provided in this embodiment, in the first aspect, the method corrects the output brightness value of the lcd module according to the compensation data to make the output brightness value of the lcd module be the target brightness value, so as to eliminate the Mura of the lcd module. The gray-brightness piecewise conversion function in the method represents the brightness conversion relation of the liquid crystal display module, the gray-brightness piecewise conversion function coefficient is calculated according to the gray values and the output brightness values of a plurality of input signals of the liquid crystal display module, the gray-brightness piecewise conversion function can more accurately represent the relation between the gray values and the output brightness values of the actual input signals of the liquid crystal display module, and the compensation data can be accurately calculated according to the gray-brightness piecewise conversion function, so that the elimination effect of eliminating the Mura of the liquid crystal display module is improved; in a second aspect, the compensation data of the method is calculated according to the gray scale to be corrected and the target brightness value thereof, so that the output brightness is the target brightness after the input signal passes through the brightness corrected by the compensation data, the Mura phenomenon of the equipment is eliminated, the method sets the target brightness value output by the gray scale to be corrected according to the gamma relation, the gamma value of the liquid crystal display module after Demura meets the requirement, the gamma correction is not needed subsequently, and compared with the prior art, the generation efficiency is improved.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a brightness Demura system of a liquid crystal display module according to another embodiment of the present invention, where the brightness Demura system of the liquid crystal display module includes:
the first setting module 301 is configured to set gray values of a plurality of input signals, and respectively obtain brightness values of the input signals displayed by the liquid crystal display module.
Specifically, the first setting module 301 sets gray values of a plurality of signals, and inputs the signals into the liquid crystal display module, the liquid crystal display module displays the signals, and the luminance value of the signals displayed by the liquid crystal display module is obtained by the luminance value obtaining device, and the luminance values displayed by the liquid crystal display module correspond to the gray values of the input signals one to one.
The input signal is the input signal of all pixels, each pixel input signal corresponds to one signal component in each input signal, and the gray value of the input signal is the specific gray value of the input signal, and the gray value is known.
The solving module 302 is configured to solve a coefficient of a gray-to-brightness piecewise conversion function by fitting according to the gray values of the plurality of input signals and the corresponding brightness values, where the gray-to-brightness piecewise conversion function represents a brightness conversion relationship of the liquid crystal display module.
Specifically, the solving module 302 substitutes the gray scale values of the plurality of input signals and the corresponding luminance values into a gray scale-luminance piecewise conversion function, and calculates by using a fitting method to obtain each coefficient of the gray scale-luminance piecewise conversion function, where the gray scale-luminance piecewise conversion function is expressed by a polynomial function at a low gray scale and expressed by an exponential function at a high gray scale, and the gray scale-luminance piecewise conversion function is:
Figure BDA0001913809740000141
where (x, y) is the two-dimensional coordinate of each input signal, ak(x，y)、b0(x, y) and b1(x, y) is a coefficient, K is 0, 1, 2,.. K, G is a segmentation point of the gray-to-luminance segmentation conversion function, K is the order of a polynomial, G (x, y) is a gray value of an input signal, f (G (x, y); x, y) is an output luminance value;
the resolution of the liquid crystal display module is nxm, the two-dimensional coordinates (x, y) of each input signal of the liquid crystal display module are respectively as follows: the gray-to-brightness piecewise conversion function represents the relation between the gray value g (x, y) of the input signal and the output brightness value f (g (x, y); x, y), and when the gray value of the input signal belongs to a middle-low gray level section, the relation between g (x, y) and f (g (x, y); x, y) is represented by a polynomial function positioned above in the gray-to-brightness piecewise conversion function; when the gray value of the input signal belongs to a high gray segment, the relationship between g (x, y) and f (g (x, y); x, y) is expressed by an exponential function located below in the gray-to-luminance piecewise conversion function.
It should be noted that, in each liquid crystal display module, the solving module 302 solves the coefficients of the gray-to-brightness piecewise conversion function by fitting according to the gray value of the input signal and the corresponding brightness value, and the gray-to-brightness piecewise conversion function solved according to the data of the liquid crystal display module can more accurately represent the relationship between the gray value of the input signal of the liquid crystal display module and the output brightness value.
The second setting module 303 is configured to set gray-scale values of the to-be-corrected gray-scales input by the liquid crystal display module, and obtain a target brightness value output by the to-be-corrected gray-scale according to a gamma relationship.
Specifically, the second setting module 303 sets gray values of S to-be-corrected gray scales, and obtains target brightness values, which are output correspondingly, of the S to-be-corrected gray scales according to a gamma relationship between the gray values of the to-be-corrected gray scales and the output target brightness values;
the gamma relationship is:
Figure BDA0001913809740000151
wherein D isiIs the gray value of the ith gray scale to be corrected, LiIs the ith target brightness value, i 1, 2maxThe maximum brightness value L displayed by the liquid crystal display moduleminThe minimum brightness value displayed by the liquid crystal display module is gamma value of the liquid crystal display module, and gamma is more than or equal to 0 and less than or equal to 2.4.
It should be noted that, the gray scale to be corrected is a target gray scale value of the input signal, Gamma (Gamma) is a physical property of the liquid crystal display module, when the input signal and the output signal displayed by the liquid crystal display module conform to a Gamma curve, the display of the liquid crystal display module conforms to the visual characteristics of human eyes, and the human eyes are comfortable when observing the display of the liquid crystal display module. Namely, when the relation curve of the gray scale value of the gray scale to be corrected and the output target brightness value of the liquid crystal display module meets the Gamma curve, the liquid crystal display module displays the gray scale meeting the visual characteristics of human eyes, and the human eyes are comfortable when observing the display of the display equipment. The gamma value normally ranges from (0, 2.7).
The processing module 304 is configured to obtain compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray-brightness piecewise conversion function, and the gray scale to be corrected.
The processing module 304 needs to select a specific function relation in the gray-brightness piecewise conversion function according to the specific gray value of the gray scale to be corrected to solve the compensation data corresponding to the gray scale to be corrected, where the gray scale to be corrected corresponds to the compensation data. And solving different compensation data according to different gray values of the gray scale to be corrected. And storing a compensation data table comprising a plurality of compensation data of the gray scales to be corrected in the liquid crystal display module.
The correcting module 305 is configured to correct the brightness value output by the lcd module by using the compensation data, so that the brightness value output by the lcd module is a target brightness value.
For the input signal of the lcd module, the correction module 305 may search the compensation data corresponding to the gray value in the compensation data table according to the specific gray value of the input signal. Therefore, the brightness value output by the signal is corrected according to the compensation data, so that the brightness value output by the liquid crystal display module is a target brightness value. And adjusting the brightness value output by the signal to be a target brightness value corresponding to the input signals with the same gray value, thereby eliminating the mura phenomenon of the liquid crystal display module.
As seen from the brightness Demura system of the lcd module provided in this embodiment, the correcting module 305 in the system corrects the output brightness value of the lcd module according to the compensation data, so that the output brightness value of the lcd module is the target brightness value, thereby eliminating the Mura of the lcd module. The gray-brightness piecewise conversion function in the system represents the brightness conversion relation of the liquid crystal display module, the gray-brightness piecewise conversion function coefficient is calculated by the solving module 302 according to the gray values and the output brightness values of a plurality of input signals of the liquid crystal display module, the gray-brightness piecewise conversion function can more accurately represent the relation between the gray values and the output brightness values of the actual input signals of the liquid crystal display module, and the compensation data can be accurately calculated according to the gray-brightness piecewise conversion function, so that the elimination effect of eliminating the Mura of the liquid crystal display module is improved.
As shown in fig. 5, fig. 5 is a schematic structural diagram of a brightness Demura system of a liquid crystal display module according to another embodiment of the present invention, the system includes:
the first setting module 401 is configured to set gray values of a plurality of input signals, and obtain brightness values displayed by the plurality of input signals in the liquid crystal display module.
Specifically, the first setting module 401 sets the gray values of the N signals, inputs the N signals into the liquid crystal display module, displays the signals by the liquid crystal display module, and obtains the brightness values of the signals displayed by the liquid crystal display module by using the brightness value obtaining device, where the obtained N brightness values correspond to the gray values of the N signals one to one.
The relationship of the gradation values of the N signals set by the first setting module 401 satisfies the following:
Figure BDA0001913809740000171
Figure BDA0001913809740000172
wherein the content of the first and second substances,
Figure BDA0001913809740000173
Figure BDA0001913809740000174
the first setting module 401 sequentially inputs the N signals into the liquid crystal display module, sequentially obtains the brightness value of the signal displayed by the liquid crystal display module, and obtains the corresponding N brightness values:
Figure BDA0001913809740000175
for a commonly-used 8-bit display, the gray value range of an input signal is 0-255, and N values are related to the number of solving coefficients.
And a solving module 402, configured to solve a coefficient of a gray-to-brightness piecewise conversion function by fitting according to the gray values of the plurality of input signals and the corresponding brightness values, where the gray-to-brightness piecewise conversion function represents a brightness conversion relationship of the liquid crystal display module.
The solving module 402 substitutes the gray values of the N input signals and the corresponding brightness values into a gray-brightness piecewise conversion function, and calculates each coefficient of the gray-brightness piecewise conversion function by using a fitting method, where the gray-brightness piecewise conversion function is expressed by the following formula:
Figure BDA0001913809740000176
where (x, y) is the two-dimensional coordinate of each input signal, ak(x，y)、b0(x, y) and b1(x, y) is a coefficient, K is 0, 1, 2,.. K, G is a segmentation point of the gray-to-luminance segmentation conversion function, K is the order of a polynomial, G (x, y) is a gray value of an input signal, f (G (x, y); x, y) is an output luminance value;
specifically, the solving module 402 solves the top N1Gray value of an input signal
Figure BDA0001913809740000181
And corresponding output brightness value
Figure BDA0001913809740000182
Inputting the data into a polynomial formula of a gray-brightness piecewise conversion function, and solving a coefficient a in the polynomial functionk(x, y) and then
Figure BDA0001913809740000183
And corresponding
Figure BDA0001913809740000184
Inputting the data into the formula of the exponential function of the gray-brightness piecewise conversion function, and solving the coefficient b of the formula of the exponential function by a curve fitting method0(x, y) and b1(x, y). Solving each coefficient of the gray scale-brightness piecewise conversion function, namely solving the brightness conversion relation.
The second setting module 403 is configured to set gray values of S input to-be-corrected gray scales of the liquid crystal display module, and obtain target brightness values output by the S to-be-corrected gray scales according to the gamma relationship.
Specifically, the second setting module 403 sets the gray-level values of the S to-be-corrected gray-levels to D respectively1，D2，...，DSSolving the target brightness value output by the S gray scales to be corrected according to the gamma relation: l is1，L2，...，LS。
Wherein, the gamma relationship is specifically as follows:
Figure BDA0001913809740000185
wherein D isiIs the gray value of the ith gray scale to be corrected, LiIs the ith target brightness value, i 1, 2maxThe maximum brightness value L displayed by the liquid crystal display moduleminThe minimum brightness value displayed by the liquid crystal display module is gamma value of the liquid crystal display module, and gamma is more than or equal to 0 and less than or equal to 2.4.
The first calculating module 404 is configured to input the target luminance output corresponding to the S to-be-corrected gray scales into the gray-luminance piecewise conversion function, and solve a gray value of the input signal corresponding to the S to-be-corrected gray scales, where the solved gray value of the input signal is: gi(x，y)＝f-1(Li；x，y)，i＝1，2，...，S。
Specifically, if the gray level D of the gray level to be corrected is set1In the range of [0, G), the first calculation module 404 will correct the gray scale D1Corresponding target brightness value L1The polynomial formula input to the gray-to-luminance piecewise conversion function is as follows:
Figure BDA0001913809740000191
according to the above formula, the first calculating module 404 solves the gray value g (x, y) of the input signal with the output brightness being the target brightness.
If the gray value D of the gray scale to be corrected1In [ G, G ]max]Within the range, the first calculating module 404 will correct the gray scale D1Corresponding target brightness value L1The input to the exponential function relation of the gray-scale-luminance piecewise conversion function is as follows:
Figure BDA0001913809740000192
according to the above formula, the first calculating module 404 solves the gray value g (x, y) of the input signal with the output brightness being the target brightness.
The second calculating module 405 is configured to obtain compensation data of the to-be-corrected gray scale according to the to-be-corrected gray scale and the gray scale value of the input signal corresponding to the to-be-corrected gray scale.
Specifically, the second calculating module 405 calculates compensation data according to a compensation data generating formula based on the gray scale to be corrected and the gray scale value of the corresponding input signal, where the compensation data generating formula is:
ΔDi(x，y)＝gi(x，y)-Di (5)
wherein D isiG corresponding to the ith gray scale to be correctedi(x, y) is the sum of the gray-scale values of the input signal and Δ Di(x, y) is compensation data, i 1, 2.., S;
the second calculating module 405 generates the compensation data Δ D of the gray scale D1 to be corrected according to the above formula1(x, y) correspondingly, respectively generating the gray scales D to be corrected according to the compensation data generation formula1，D2，...，DSCorresponding compensation data Δ D1(x，y)，ΔD2(x，y)，...，ΔDS(x，y)。
Note that, the compensation data table includes: and acquiring compensation data corresponding to the gray scale to be corrected according to the gray scale value of the gray scale to be corrected. And storing the compensation data table into a Flash ROM of the display equipment according to a hardware circuit of the liquid crystal display module so as to be used for correcting the display brightness of the display equipment in the following.
It should be further noted that the first calculating module 404 and the second calculating module 405 of the present embodiment are refinement modules of the processing module 304 of the previous embodiment.
The correcting module 406 is configured to correct the brightness value output by the liquid crystal display module by using the compensation data, so that the brightness value output by the liquid crystal display module is a target brightness value.
Specifically, the correction module 406 calculates a correction amount according to the compensation data, and corrects the output brightness value of the signal according to the correction amount.
After the output brightness value of the input signal is corrected by the correction quantity, the brightness values of the output signal are all corrected brightness, so that the image displayed by the liquid crystal display module can be observed by naked eyes of human eyes, and the display effect that Mura cannot be seen by naked eyes of human eyes can be achieved.
In the embodiment of the present invention, the first setting module 401 sets the two-dimensional coordinates of each signal to be (x, y), where x has a value of 0, 1,.. and 3839, and y has a value of 0, 1,.. and 2159, and G, respectivelymaxThe maximum value of the pixel gray scale is 255, 0 is larger than or equal to G (x, y) is smaller than or equal to 255, the dividing point G of the gray scale-brightness segmentation conversion function is set to be 200, and the order K of the polynomial function is set to be 4. The gray scale-brightness piecewise conversion function of the liquid crystal display module expressing the brightness conversion relation is as follows:
Figure BDA0001913809740000201
wherein, a0(x，y)、a1(x，y)、a2(x，y)、a3(x，y)、a4(x，y)、b0(x, y) and b1(x, y) are coefficients.
In this embodiment of the present invention, the number N of the input signals set by the first setting module 401 is 6, and the gray-level values of the input signals are g by the first setting module 401 respectively1(x，y)＝0，g2(x，y)＝20，g3(x，y)＝50，g4(x，y)＝100，g5(x，y)＝200，g6The (x, y) ═ 255 is input to the liquid crystal display module in sequence, and the 6 input signals are obtained, and the 6 brightness values displayed in the liquid crystal display module are respectively f (g)1(x，y)；x，y)，f(g2(x，y)；x，y)，f(g3(x，y)；x，y)，f(g4(x，y)；x，y)，f(g5(x，y)；x，y)，f(g6(x, y); x, y). Since the dividing point G of the gray-to-brightness piecewise conversion function is 200, the first setting module 401 inputs 0, 20, 50, 100, 200 and the corresponding display brightness value into the formula (a), and the solving module 402 solves the coefficient a of the formula (a) by using the least square curve fitting method0(x，y)，a1(x，y)，a2(x，y)，a3(x，y)，a4(x, y), then solving the coefficient b in the formula (b) by using a curve fitting method0(x, y) and b1(x, y). Thereby solving the expression of the gray-to-brightness piecewise conversion function.
In the embodiment of the present invention, after the solving module 402 solves the expression of the gray-to-brightness piecewise conversion function, the second setting module 403 sets the value of the number S of the to-be-corrected gray scales to be 3, and the 3 to-be-corrected gray scales are respectively: d1＝24，D2＝65，D3The second setting module 403 inputs the value of the gray scale to be corrected into the Gamma relation (2) where the Gamma value is 2.2, and the corresponding target brightness values are L1，L2，L3。
Wherein, the gray scale D to be corrected1Is in the range of [0, 200), the first calculation module 404 will correct the gray scale D1Corresponding target brightness value L1Substituting into equation (a) yields the following equation:
Figure BDA0001913809740000211
solving the target brightness value L from the above formula by Newton iteration method1Gray value g of the input signal24(x, y), the compensation data of the gray scale 24 to be corrected solved by the second calculating module 405 is:
ΔD1(x，y)＝g24(x，y)-24 (d)
to-be-corrected gray scale D2Is in the range of [0, 200), the first calculation module 404 will correct the gray scale D2Corresponding target brightness value L2Substituting into formula(a) To give the following formula:
Figure BDA0001913809740000212
solving the target brightness value L from the above formula by Newton iteration method2Gray value g of the input signal65(x, y), the compensation data of the to-be-corrected gray scale 65 solved by the second calculating module 405 is:
ΔD2(x，y)＝g65(x，y)-65 (f)
to-be-corrected gray scale D3At a gray scale value of [200, 255 ]]Within the range, the first calculating module 404 will correct the gray scale D3Corresponding target brightness value L3Substituting into equation (b) yields the following equation:
Figure BDA0001913809740000213
directly solving the target brightness value L from the above formula3Gray value g of the input signal220(x, y), the compensation data of the gray scale 220 to be corrected solved by the second calculating module 405 is:
ΔD3(x，y)＝g220(x，y)-220 (h)
wherein, Δ D1(x，y)，ΔD2(x，y)，ΔD3(x, y) are respectively the compensation data generated corresponding to the gray scale 24 to be corrected, the gray scale 65 to be corrected and the gray scale 220 to be corrected. The generated compensation data is converted into a data table with a corresponding format by a hardware circuit of the liquid crystal display module, and is stored in a Flash ROM for correcting the display brightness of the liquid crystal display module. The brightness value of the output signal can be corrected according to the compensation data table, and the effect of eliminating the image Mura is achieved.
In the embodiment of the invention, the gray value of the input signal of the liquid crystal display module is 100, the display signal of the liquid crystal display module is acquired by a camera, the display signal is a display image, the displayed image has bright twill, dark twill, oblique-strip-shaped black band, oblique-strip-shaped white band, vertical black band and black-block Mura, and the Mura area reaches 95%. After the method is adopted to carry out brightness Demura on the liquid crystal display module, the liquid crystal display module displays an image with a gray value of any value, and the image is observed by naked eyes without observing the Mura phenomenon of the image.
It should be noted that the brightness Demura method of the liquid crystal display module can also be used for brightness Demura of other display devices.
As seen from the brightness Demura system of the lcd module provided in this embodiment, in the first aspect, the correcting module 406 in the system corrects the output brightness value of the lcd module according to the compensation data, so that the output brightness value of the lcd module is the target brightness value, thereby eliminating the Mura of the lcd module. The gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module, the coefficient of the gray-brightness piecewise conversion function is calculated by the solving module 402 according to the gray values and the output brightness values of a plurality of input signals of the liquid crystal display module, the gray-brightness piecewise conversion function can more accurately represent the relation between the gray values and the output brightness values of the actual input signals of the liquid crystal display module, and the compensation data can be accurately calculated according to the gray-brightness piecewise conversion function, so that the elimination effect of eliminating the Mura of the liquid crystal display module is improved. In a second aspect, the compensation data in the system is calculated according to the gray scale to be corrected and the target brightness value thereof, so that the output brightness is the target brightness after the input signal passes through the brightness corrected by the compensation data, the Mura phenomenon of the equipment is eliminated, the system sets the target brightness value output by the gray scale to be corrected according to the gamma relation, the gamma value of the liquid crystal display module after Demura meets the requirement, the gamma correction is not needed subsequently, and compared with the prior art, the generation efficiency is improved.
Fig. 6 is a schematic structural diagram of a computing device according to another embodiment of the present invention. As shown in fig. 6, the computing device 5 of this embodiment includes: a processor 501, a memory 502, and a computer program 503, such as a program for the brightness Demura method of a liquid crystal display module, stored in the memory 502 and executable on the processor 501. The processor 501 executes the computer program 503 to implement the steps of the brightness Demura method embodiment of the lcd module, such as the steps 101 to 105 shown in fig. 1. Alternatively, the processor 501, when executing the computer program 503, implements the functions of the modules/units in the above-described apparatus embodiments, such as the functions of the first setting module 301, the solving module 302, the second setting module 303, the processing module 304, and the modifying module 305 shown in fig. 4.
Illustratively, the computer program 503 for the brightness Demura method of the lcd module mainly includes: setting gray values of a plurality of input signals, and respectively acquiring brightness values displayed by the input signals in the liquid crystal display module; solving the coefficient of a gray-brightness piecewise conversion function through fitting according to the gray values and the corresponding brightness values of the plurality of input signals, wherein the gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module; setting gray values of all input gray scales to be corrected of the liquid crystal display module, and acquiring target brightness values output by all the gray scales to be corrected according to a gamma relation; obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray scale-brightness subsection conversion function formula and the gray scale to be corrected; and correcting the brightness value output by the liquid crystal display module by using the compensation data to enable the brightness value output by the liquid crystal display module to be a target brightness value. The computer program 503 may be divided into one or more modules/units, which are stored in the memory 502 and executed by the processor 501 to accomplish the present invention. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions that describe the execution of computer program 503 in computing device 5. For example, the computer program 503 may be divided into functions of the first setting module 301, the solving module 302, the second setting module 303, the processing module 304, and the modifying module 305 (modules in the virtual device), and the specific functions of each module are as follows: the first setting module 301 is configured to set gray values of the plurality of input signals and obtain brightness values displayed by the plurality of input signals on the liquid crystal display module; a solving module 302, configured to solve a coefficient of a gray-to-brightness piecewise conversion function by fitting according to gray values of the plurality of input signals and corresponding brightness values, where the gray-to-brightness piecewise conversion function represents a brightness conversion relationship of the liquid crystal display module; the second setting module 303 is configured to set gray values of the to-be-corrected gray scales input by the liquid crystal display module, and obtain target brightness values output by the to-be-corrected gray scales according to a gamma relationship; the processing module 304 is configured to obtain compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray-brightness piecewise conversion function, and the gray scale to be corrected; the correcting module 305 is configured to correct the brightness value output by the lcd module by using the compensation data, so that the brightness value output by the lcd module is a target brightness value.
Computing device 5 may include, but is not limited to, a processor 501, a memory 502. Those skilled in the art will appreciate that fig. 6 is merely an example of computing device 5 and is not intended to be limiting of computing device 5 and may include more or fewer components than those shown, or some of the components may be combined, or different components, e.g., the computing device may also include input output devices, network access devices, buses, etc.
The Processor 501 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Memory 502 may be an internal storage unit of computing device 5, such as a hard disk or memory of computing device 5. Memory 502 may also be an external storage device of computing device 5, such as a plug-in hard drive provided on computing device 5, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and so forth. Further, memory 502 may also include both internal storage units of computing device 5 and external storage devices. The memory 502 is used to store computer programs and other programs and data required by the computing device. The memory 502 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/computing device and method may be implemented in other ways. For example, the above-described apparatus/computing device embodiments are merely illustrative, and for example, a division of modules or units is merely a logical division, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the method of the embodiments of the present invention may also be implemented by instructing related hardware through a computer program, where the computer program of the brightness Demura method of the liquid crystal display module may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the methods may be implemented, that is, setting gray values of a plurality of input signals, and respectively obtaining the brightness values displayed by the input signals on the liquid crystal display module; solving the coefficient of a gray-brightness piecewise conversion function through fitting according to the gray values and the corresponding brightness values of the plurality of input signals, wherein the gray-brightness piecewise conversion function represents the brightness conversion relation of the liquid crystal display module; setting gray values of all input gray scales to be corrected of the liquid crystal display module, and acquiring target brightness values output by all the gray scales to be corrected according to a gamma relation; obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray scale-brightness subsection conversion function formula and the gray scale to be corrected; and correcting the brightness value output by the liquid crystal display module by using the compensation data to enable the brightness value output by the liquid crystal display module to be a target brightness value.
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 medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. 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 media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals. The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
In view of the above description of the brightness Demura method and system for a liquid crystal display module according to the present invention, those skilled in the art will recognize that there are variations in the embodiments and applications of the invention.

Claims (9)

1. A brightness Demura method of a liquid crystal display module is characterized by comprising the following steps:
setting gray values of a plurality of input signals, and respectively acquiring brightness values displayed by the input signals in the liquid crystal display module;
solving coefficients of a gray-brightness piecewise conversion function by fitting according to gray values of the plurality of input signals and the corresponding brightness values, wherein the gray-brightness piecewise conversion function represents a brightness conversion relation of the liquid crystal display module, the gray-brightness piecewise conversion function is represented by a polynomial function at a low gray scale and is represented by an exponential function at a high gray scale, and the gray-brightness piecewise conversion function is as follows:
Figure FDA0002784091520000011
where (x, y) is the two-dimensional coordinate of each input signal, ak(x，y)、b0(x, y) and b1(x, y) is a coefficient, K is 0, 1, 2,.. K, G is a segmentation point of the gray-to-luminance segmentation conversion function, K is the order of a polynomial, G (x, y) is a gray value of an input signal, f (G (x, y); x, y) is an output luminance value;
setting gray values of all input gray scales to be corrected of the liquid crystal display module, and acquiring target brightness values output by the gray scales to be corrected according to a gamma relation;
obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray-brightness piecewise conversion function and the gray scale to be corrected;
and correcting the brightness value output by the liquid crystal display module by using the compensation data to enable the brightness value output by the liquid crystal display module to be a target brightness value.
2. The method according to claim 1, wherein the step of setting gray-scale values of the gray-scale to be corrected inputted by each of the liquid crystal display modules, and obtaining target brightness values outputted by the gray-scale to be corrected according to a gamma relationship comprises:
setting gray values of S gray scales to be corrected, and obtaining corresponding output target brightness values of the S gray scales to be corrected according to the gamma relation between the gray values of the gray scales to be corrected and the output target brightness values;
the gamma relationship is as follows:
Figure FDA0002784091520000021
wherein D isiIs the gray value of the ith gray scale to be corrected, LiIs the ith target brightness value, i 1, 2maxThe maximum brightness value L displayed by the liquid crystal display moduleminThe minimum brightness value displayed by the liquid crystal display module is gamma value of the liquid crystal display module, and gamma is more than or equal to 0 and less than or equal to 2.4.
3. The method according to claim 2, wherein the step of obtaining the compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray-brightness piecewise conversion function and the gray scale to be corrected comprises:
inputting target brightness output corresponding to S gray scales to be corrected into a gray-brightness piecewise conversion function, solving gray values of input signals corresponding to the S gray scales to be corrected, and solving gray values of the input signals corresponding to the S gray scales to be corrected, wherein the gray values are as follows: gi(x，y)＝f-1(Li；x，y)，i＝1，2，...，S；
And obtaining compensation data of the gray scale to be corrected according to the gray scale to be corrected and the gray scale value of the input signal corresponding to the gray scale to be corrected.
4. The method according to claim 3, wherein the step of obtaining the compensation data of the gray scale to be corrected according to the gray scale to be corrected and the corresponding gray scale value of the input signal comprises:
calculating to obtain compensation data according to a compensation data generation formula based on the gray scale to be corrected and the gray scale value of the corresponding input signal, wherein the compensation data generation formula is as follows:
ΔDi(x，y)＝gi(x，y)-Di
wherein D isiG corresponding to the ith gray scale to be correctedi(x, y) is the sum of the gray-scale values of the input signal and Δ Di(x, y) is compensation data, i 1, 2.
5. A brightness Demura system of a liquid crystal display module, the system comprising:
the first setting module is used for setting gray values of a plurality of input signals and respectively acquiring brightness values displayed by the input signals on the liquid crystal display module;
a solving module, configured to solve, according to the gray scale values of the plurality of input signals and the corresponding luminance values, coefficients of a gray-luminance piecewise conversion function by fitting, where the gray-luminance piecewise conversion function represents a luminance conversion relationship of the liquid crystal display module, where the gray-luminance piecewise conversion function is represented by a polynomial function at a low gray scale and is represented by an exponential function at a high gray scale, and the gray-luminance piecewise conversion function is:
Figure FDA0002784091520000031
where (x, y) is the two-dimensional coordinate of each input signal, ak(x，y)、b0(x, y) and b1(x, y) is a coefficient, K is 0, 1, 2,.. K, G is a segmentation point of the gray-to-luminance segmentation conversion function, K is the order of a polynomial, G (x, y) is a gray value of an input signal, f (G (x, y); x, y) is an output luminance value;
the second setting module is used for setting gray values of all input gray scales to be corrected of the liquid crystal display module and acquiring target brightness values output by the gray scales to be corrected according to a gamma relation;
the processing module is used for obtaining compensation data corresponding to each gray scale to be corrected according to the target brightness value, the gray scale-brightness piecewise conversion function and the gray scale to be corrected;
and the correction module is used for correcting the brightness value output by the liquid crystal display module by using the compensation data so as to enable the brightness value output by the liquid crystal display module to be a target brightness value.
6. The system of claim 5, wherein the processing module comprises:
the first calculation module is configured to input target luminance output corresponding to the S to-be-corrected gray scales into a gray-luminance piecewise conversion function, and solve gray values of input signals corresponding to the S to-be-corrected gray scales, where the gray values are: gi(x，y)＝f-1(Li；x，y)，i＝1，2，...，S；
And the second calculation module is used for obtaining compensation data of the gray scale to be corrected according to the gray scale to be corrected and the gray scale value of the input signal corresponding to the gray scale to be corrected.
7. The system according to claim 6, wherein the second calculating module is specifically configured to calculate compensation data according to a compensation data generating formula based on the gray scale to be corrected and the gray scale value of the corresponding input signal, and the compensation data generating formula is as follows:
ΔDi(x，y)＝gi(x，y)-Di
wherein D isiG corresponding to the ith gray scale to be correctedi(x, y) is the sum of the gray-scale values of the input signal and Δ Di(x, y) is compensation data, i 1, 2.
8. A computing device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 4 when executing the computer program.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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