CN111554224A - Display panel mura compensation method and device and display device - Google Patents
Display panel mura compensation method and device and display device Download PDFInfo
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Abstract
The invention discloses a mura compensation method and device for a display panel and a display device. The method comprises the following steps: acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; acquiring a gray scale picture of the display panel under the minimum value in the preset DBV, and determining a linkage DBV, wherein the linkage DBV does not have mura when the gray scale is larger than or equal to the reference gray scale; and taking the linkage DBV as a segmented node, and performing segmented compensation on the area of the display panel with mura. The embodiment of the invention can dynamically compensate the display panel according to the display brightness value of the display panel, and particularly can improve the compensation effect when the display brightness value is lower, thereby improving the display effect.
Description
Technical Field
The embodiment of the invention relates to a Demura technology, in particular to a display panel mura compensation method, a display panel mura compensation device and a display device.
Background
With the development of display technology, the application of display panels is more and more extensive, and the requirements on display panels are higher and higher correspondingly.
However, the mura (Display non-uniformity) phenomenon exists in the Display process of the conventional Display panel, and the mura compensation method of the conventional art cannot provide an appropriate compensation Value when the Display Brightness Value (DBV) of the Display panel changes, so that the Display effect of the Display panel is not good.
Disclosure of Invention
The invention provides a mura compensation method and device for a display panel and a display device, which are used for dynamically compensating the display panel according to display brightness values of the display panel and improving the display effect.
In a first aspect, an embodiment of the present invention provides a method for mura compensation of a display panel, where the method includes: acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; acquiring a gray scale picture of the display panel under the minimum value in the preset DBV, and determining a linkage DBV, wherein the linkage DBV does not have mura when the gray scale is larger than or equal to the reference gray scale; and taking the linkage DBV as a segmented node, and performing segmented compensation on the area of the display panel with mura.
Optionally, the node using the linkage DBV as a segment performs segment compensation on an area of the display panel where mura exists, including: obtaining gray scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a first gray scale compensation formula through fitting, wherein the first gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the first gray scale compensation formula is greater than or equal to the minimum value in the preset DBV and smaller than or equal to the linkage DBV; obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a second gray scale compensation formula through fitting, wherein the second gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the second gray scale compensation formula is less than or equal to the maximum value in the preset DBV and is greater than or equal to the linkage DBV; compensating the area of the display panel with mura by using gray scale compensation data acquired by the first gray scale compensation formula at the stage that the input DBV of the display panel is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; and at the stage that the input DBV of the display panel is less than or equal to the maximum value in the preset DBV and is greater than the linkage DBV, compensating the area of the display panel with mura by using the gray scale compensation data acquired by the second gray scale compensation formula.
Optionally, the first gray scale compensation formula is: z-a 1 x + b1 y + c 1; and/or the second gray level compensation formula is as follows: z-a 2 x + b2 y + c 2; the z is gray scale compensation data, the x is an input DBV, and the y is an input gray scale value; the a1, the b1, the c1, the a2, the b2 and the c2 are all constants.
Optionally, obtaining gray-scale compensation data when the input DBV of the display panel is the minimum value of the preset DBVs and the linkage DBV according to a preset mura compensation algorithm includes: obtaining a first corresponding relation between an input gray scale value and gray scale compensation data of the display panel under the current input DBV according to the preset mura compensation algorithm, and obtaining gray scale compensation data corresponding to a plurality of input gray scale values of the display panel under the current input DBV according to the first corresponding relation; and/or obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm, wherein the gray scale compensation data comprises the following data: and obtaining a second corresponding relation between the input gray scale value of the display panel under the current input DBV and gray scale compensation data according to the preset mura compensation algorithm, and obtaining the gray scale compensation data corresponding to a plurality of input gray scale values of the display panel under the current input DBV according to the second corresponding relation.
Optionally, the preset mura compensation algorithm includes: the Parameter Type method or the Inverse Profile Type method.
Optionally, the obtaining a gray scale picture of the display panel at a minimum value in a preset display brightness value DBV, and determining that a maximum gray scale of mura exists according to the gray scale picture, where the maximum gray scale serving as a reference gray scale includes: acquiring a minimum value of the display panel in a preset DBV (digital video), and a gray scale picture when the gray scale picture is a plurality of sampling gray scales, and determining that a mura maximum gray scale exists according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; wherein the plurality of sampling gray levels comprises: 16 gray levels, 32 gray levels, 64 gray levels, 128 gray levels, and 196 gray levels.
In a second aspect, an embodiment of the present invention further provides a display panel mura compensation apparatus, including: the first acquisition module is used for acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; the second acquisition module is used for acquiring a gray scale picture of the display panel under the minimum value in the preset DBV and determining a linkage DBV, wherein the linkage DBV does not have mura when the gray scale is larger than or equal to the reference gray scale; and the compensation module is used for carrying out sectional compensation on the area of the display panel with mura by taking the linkage DBV as a sectional node.
Optionally, wherein the compensation module comprises: the first fitting module is used for obtaining gray scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a first gray scale compensation formula through fitting, wherein the first gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the first gray scale compensation formula is greater than or equal to the minimum value in the preset DBV and smaller than or equal to the linkage DBV; the second fitting module is used for obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a second gray scale compensation formula through fitting, wherein the second gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the second gray scale compensation formula is less than or equal to the maximum value in the preset DBV and is greater than or equal to the linkage DBV; the compensation submodule is used for compensating the area of the display panel with mura by using gray scale compensation data acquired by the first gray scale compensation formula at the stage that the input DBV of the display panel is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; and at the stage that the input DBV of the display panel is less than or equal to the maximum value in the preset DBV and is greater than the linkage DBV, compensating the area of the display panel with mura by using the gray scale compensation data acquired by the second gray scale compensation formula.
Optionally, the first gray scale compensation formula is: z-a 1 x + b1 y + c 1; and/or the second gray level compensation formula is as follows: z-a 2 x + b2 y + c 2; the z is gray scale compensation data, the x is an input DBV, and the y is an input gray scale value; the a1, the b1, the c1, the a2, the b2 and the c2 are all constants.
In a third aspect, an embodiment of the present invention further provides a display device, including a storage module, configured to store grayscale compensation data, where the grayscale compensation data is obtained by the method according to the first aspect.
In the technical solution of this embodiment, the adopted mura compensation method for the display panel includes: acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; acquiring a gray scale picture of the display panel under the minimum value in a preset DBV, and determining a linkage DBV, wherein mura does not exist when the linkage DBV meets the condition that the gray scale is greater than or equal to a reference gray scale; and (4) performing segmented compensation on the area of the display panel with mura by taking the linkage DBV as a segmented node. Through obtaining linkage DBV, carry out the segmentation compensation to the region that display panel exists the mura, the input grey scale is the same but the input DBV of display panel is different (if input DBV is higher or when lower) compensation data is different, and then realizes according to display panel's input DBV to display panel dynamic compensation, especially can promote the compensation effect when input DBV is lower, and then promotes the display effect.
Drawings
FIG. 1 is a flowchart of a mura compensation method for a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a mura compensation apparatus of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background art, the conventional mura compensation method has a poor compensation effect when the DBV of the display panel changes, and the inventors have found through careful study that the reason for the technical problem is: the existing mura compensation method only collects gray scale images of a plurality of groups of display panels under a certain DBV for analysis, if the collected gray scales under the DBV are 16, 32, 64, 128 and 196, if mura signs exist at 64 gray scales, the mura signs are used as a reference for compensation processing, and all DBV compensation conditions are covered by the mura signs, however, if serious mura exists at the lower DBV brightness of the display panels, the mura signs are weak at the higher brightness, and therefore the mura signs may appear above 64 gray scales along with the reduction of the DBV, so that the existing mura compensation method cannot be effectively applied to mura improvement conditions under the low DBV and the low brightness.
In light of the above technical problems, the present invention proposes the following solutions:
fig. 1 is a flowchart of a mura compensation method of a display panel according to an embodiment of the present invention, and referring to fig. 1, the mura compensation method includes:
step S101, obtaining a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale;
specifically, the preset DBVs of the Gamma segments may be set first, the minimum value of the preset DBVs may be the minimum value of the DBV of the display panel, and the maximum value of the preset DBVs may be the maximum value of the DBV of the display panel, for example, the preset DBVs of the Gamma segments may be set to be 0x07FF, 0x0580, 0x03ED, 0x029E, 0x019E, 0x00DF, and 0x000A, and it should be noted that in some other embodiments, the preset DBV may also be another value. Firstly, enabling a display panel to display a gray scale picture with the minimum value in a plurality of preset DBVs, if the input DBV of the display panel is 0x000A, enabling the display panel to display a plurality of gray scale pictures corresponding to different input gray scales under the input DBV, if the display panel supports 256 gray scales, respectively acquiring the 256 gray scale pictures with different gray scales, and in other embodiments, acquiring the gray scale pictures at a plurality of sampling gray scale values; each gray scale picture can be collected through a CCD or other optical equipment, the collected gray scale pictures can be analyzed through a processor to determine that the maximum gray scale of mura exists in the plurality of gray scale pictures, and if the mura exists in the 128 gray scale and does not exist in the 128 gray scale or more than the 128 gray scale, the 128 gray scale is used as the reference gray scale of the display panel under the input DBV. It should be noted that the determination criterion of whether mura exists is well known by those skilled in the art and is not described herein, and meanwhile, the absence of mura when the gray scale is greater than 128 gray scale means that the mura degree of the display panel appearing when the gray scale is greater than 128 gray scale is far weaker than the mura degree of the display panel appearing when the gray scale is 128 gray scale, for example, the mura degree of the display panel appearing when the gray scale is greater than 128 gray scale is less than 1% of the mura degree of the display panel appearing when the gray scale is 128 gray scale; the degree of mura can be judged by human eyes or quantified by a quantification method.
Step S102, obtaining a gray scale picture of the display panel under the minimum value in a preset DBV, and determining a linkage DBV, wherein mura does not exist when the linkage DBV meets the condition that the gray scale is greater than or equal to a reference gray scale;
specifically, after the reference gray level is determined, a gray level frame of the preset DBV divided by the minimum value may be obtained, for example, the input DBV may be first increased from 0x000A to 0x00DF, a plurality of gray level frames with different input gray levels under the input DBV (i.e., the input DBV is 0x00DF) may be obtained, for example, the frames under the input DBV (0x00DF) may be obtained in the same manner as when the input DBV is 0x000A, if mura still exists at the 128 gray level, the input DBV may be continuously increased, and if the input DBV is 0x019E, the mura does not exist at the 128 gray level, 0x019E is used as the linkage DBV. It should be noted that, the linkage DBV can be a DBV with a gray scale greater than or equal to a reference gray scale in the preset DBV, and mura does not exist and the difference between the minimum value and the minimum value in the preset DBV is minimum, so that the linkage DBV can be closer to the minimum value in the preset DBV, and the compensation effect is better when the DBV is low.
And S103, carrying out sectional compensation on the area of the display panel with mura by taking the linkage DBV as a sectional node.
Specifically, when the input DBV of the display panel is smaller than the linkage DBV, the input DBV of the display panel is smaller, and when the input DBV of the display panel is larger than the linkage DBV, the input DBV of the display panel is larger, the sectional compensation is performed through the mura-existing region of the display panel, for example, the sectional compensation is performed by taking the minimum value of the preset DBVs to the linkage DBV as one section, and taking the maximum value of the linkage DBV to the preset DBVs as another section, and the compensation data are different when the input gray scales of the display panel are the same but the input DBVs are different (for example, when the input DBV is higher or lower), so that the dynamic compensation of the display panel according to the input DBV of the display panel is realized, especially the compensation effect when the input DBV is lower can be improved, and the display effect is further improved.
In the technical solution of this embodiment, the adopted mura compensation method for the display panel includes: acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; acquiring a gray scale picture of the display panel under the minimum value in a preset DBV, and determining a linkage DBV, wherein mura does not exist when the linkage DBV meets the condition that the gray scale is greater than or equal to a reference gray scale; and (4) performing segmented compensation on the area of the display panel with mura by taking the linkage DBV as a segmented node. Through obtaining linkage DBV, carry out the segmentation compensation to the region that display panel exists the mura, the input grey scale is the same but the input DBV of display panel is different (if input DBV is higher or when lower) compensation data is different, and then realizes according to display panel's input DBV to display panel dynamic compensation, especially can promote the compensation effect when input DBV is lower, and then promotes the display effect.
Optionally, with the linkage DBV as a node, performing segmented compensation on an area of the display panel where mura exists includes: obtaining gray scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura algorithm so as to fit a first gray scale compensation formula, wherein the first gray scale compensation formula is the corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the first gray scale compensation formula is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm, and fitting to obtain a second gray scale compensation formula, wherein the second gray scale compensation formula is the corresponding relation of the input DBV, the input gray scale value and the gray scale compensation data, and the input DBV corresponding to the second gray scale compensation formula is less than or equal to the maximum value in the preset DBV and is greater than or equal to the linkage DBV; compensating the area of the display panel with mura by using gray scale compensation data acquired by a first gray scale compensation formula at the stage that the input DBV of the display panel is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; and at the stage that the input DBV of the display panel is less than or equal to the maximum value in the preset DBV and is greater than the linkage DBV, compensating the area of the display panel with mura by using the gray scale compensation data acquired by the second gray scale compensation formula.
Specifically, when the preset mura compensation algorithm is used for obtaining gray scale compensation data when the input DBV of the display panel is the preset DBV, the algorithm is more mature, the obtained gray scale compensation data is more accurate, and meanwhile, the verification of the gray scale compensation data is facilitated; in the first gray scale compensation formula and the second gray scale compensation formula, the input DBV and the input gray scale value of the display panel are independent variables, and the gray scale compensation data are dependent variables, that is, when the input DBV and the input gray scale value of the display panel are obtained, the gray scale compensation data can be determined according to the input DBV and the input gray scale value, so that the mura area of the display panel is compensated, and the display effect is improved. It should be noted that the input DBV of the display panel can be input by a user, for example, the user adjusts the input DBV by adjusting the brightness bar of the display panel, and the input gray level value can be determined according to the required displayed frame. In the embodiment, the gray scale compensation data is related to both the input DBV and the input gray scale value of the display panel, and compared with the existing scheme that the gray scale compensation data is related to the input gray scale value only, the compensation effect is better, so that the display effect of the display panel is improved.
Optionally, the first compensation formula is: z-a 1 x + b1 y + c 1; and/or the second gray level compensation formula is: z-a 2 x + b2 y + c 2; z is gray scale compensation data, x is input DBV, and y is input gray scale value; a1, b1, c1, a2, b2 and c2 are all constants.
Specifically, the first gray scale compensation formula and the second gray scale compensation formula can both be linear formulas, so that the fitting difficulty of the first gray scale compensation formula and the second gray scale compensation formula can be reduced. For example, a1, b1, and c1 in the first compensation formula may be determined according to the following manner;
obtaining the minimum value of the input DBV of the display panel as the preset DBV and the gray scale compensation data of the linkage DBV according to the preset mura compensation algorithm, and if n gray scale compensation data are obtained in total, setting n fitting points (xi, yi, zi); wherein xi represents input DBV, the input DBV is the minimum value in the preset DBV or linkage DBV, yi represents input gray level value, zi represents gray level compensation data, each fitting point is positioned on the first gray level compensation formula, and then setting can be carried out
Calculating a partial derivative to obtain:
further obtaining:
the above formula is simplified as:
then a1, b1, and c1 are:
by using the same method, if the input DBV of the display panel is the maximum value in the preset DBV and the gray scale compensation data of the linkage DBV are obtained according to the preset mura compensation algorithm, if n gray scale compensation data are obtained, n fitting points (xi, yi, zi) can be set; wherein xi represents input DBV, the input DBV is the maximum value in the preset DBV or linkage DBV, yi represents input gray level value, zi represents gray level compensation data, each fitting point is positioned on the first gray level compensation formula, and then setting can be carried out
Calculating a partial derivative to obtain:
further obtaining:
the above formula is simplified as:
then a2, b2, and c2 are:
optionally, obtaining gray-scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm includes: obtaining a first corresponding relation between an input gray scale value and gray scale compensation data of the display panel under the current input DBV according to a preset mura compensation algorithm, and obtaining gray scale compensation data corresponding to a plurality of input gray scale values of the display panel under the current input DBV according to the first corresponding relation; and/or obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to the preset mura compensation algorithm, wherein the gray scale compensation data comprises the following data: and obtaining a second corresponding relation between the input gray scale value of the display panel under the current input DBV and the gray scale compensation data according to the preset mura compensation algorithm, and obtaining the gray scale compensation data corresponding to the plurality of input gray scale values of the display panel under the current input DBV according to the second corresponding relation.
Specifically, the first corresponding relationship can be calculated according to the mura gray scale of the display panel under the current input DBV, and then the first corresponding relationship is obtained, if the obtained first corresponding relationship is y ═ Ax + B, where x represents the input gray scale value, y represents the gray scale compensation data, a and B are constants determined by using a preset mura compensation algorithm, and after the first corresponding relationship is obtained, the first corresponding relationship is used to obtain the gray scale compensation data corresponding to the plurality of input gray scale values of the display panel under the input DBV, so as to be used for subsequently fitting the first gray scale compensation formula. The current input DBV is the minimum value in the preset DBV, the linkage DBV or the maximum value in the preset DBV, and when the current DBV is the minimum value in the preset DBV and the linkage DBV, a first corresponding relation can be obtained; when the current DBV is a maximum value in the preset DBV and the DBV is linked, a second correspondence may be obtained.
Optionally, the preset mura compensation algorithm includes: the Parameter Type method or the Inverse Profile Type method.
Specifically, the Parameter Type method or the Inverse Profile Type method has the advantages of high algorithm stability, accurate calculation and the like, the accuracy of gray scale compensation data obtained by the mura compensation method of the display panel can be further improved, and the use value of the mura compensation method of the display panel is improved.
Optionally, a gray scale picture of the display panel under a minimum value in a preset display brightness value DBV is obtained, and a maximum gray scale of mura is determined according to the gray scale picture, where the maximum gray scale is used as a reference gray scale and includes: acquiring a minimum value of a display panel in a preset DBV (digital video broadcasting), and a gray scale picture when the gray scale picture is a plurality of sampling gray scales, and determining that a mura maximum gray scale exists according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; wherein the plurality of sampling gray levels comprises: 16 gray levels, 32 gray levels, 64 gray levels, 128 gray levels, and 196 gray levels.
Specifically, if 256 gray scales of the display panel are obtained when the gray scale picture of the display panel under the minimum value in the preset DBV is obtained, the workload is greatly increased, the time cost is increased, and the gray scale picture can be obtained only at a few sampling gray scale values, so that the workload is greatly reduced, and the time cost is reduced. The maximum gray scale at this time is one of the sampling gray scales, and the sampling gray scale may be determined according to the model of the display panel or the model of the IC driving the display panel, and is not limited to the sampling gray scale provided in this embodiment. It should be noted that, the gray scale picture of the display panel in the preset DBV except the minimum value may also be obtained by only obtaining the gray scale pictures corresponding to several sampling gray scales of the display panel in a certain preset DBV, so as to further reduce the workload and reduce the time cost.
Fig. 2 is a schematic structural diagram of a mura compensation apparatus for a display panel according to an embodiment of the present invention, and referring to fig. 2, the compensation apparatus includes: a first obtaining module 201, configured to obtain a gray scale picture of the display panel at a minimum value in a preset display brightness value DBV, and determine a maximum gray scale with mura according to the gray scale picture, where the maximum gray scale is used as a reference gray scale; a second obtaining module 202, configured to obtain a gray scale picture of the display panel except for a minimum value in a preset DBV, and determine a linkage DBV, where mura does not exist when a gray scale of the linkage DBV is greater than or equal to a reference gray scale; and the compensation module 203 is used for performing segmented compensation on the area of the display panel with mura by taking the linkage DBV as a node.
Specifically, preset DBVs of a plurality of Gamma sections may be set first, a minimum value of the preset DBVs may be a minimum value of a DBV of the display panel, and a maximum value of the preset DBVs may be a maximum value of the DBV of the display panel. Firstly, enabling a display panel to display a gray scale picture with the minimum value in a plurality of preset DBVs, if the input DBV of the display panel is 0x000A, enabling the display panel to display a plurality of gray scale pictures corresponding to different input gray scales under the input DBV, and if the display panel supports 256 gray scales, respectively obtaining 256 gray scale pictures with different gray scales; each gray scale picture can be collected by a CCD or other optical equipment, the collected gray scale pictures can be analyzed by a processor to determine that the maximum gray scale of mura exists in the plurality of gray scale pictures, and if the input DBV is 0x000A, the mura exists in the 128 gray scale of the display panel, and if the mura does not exist in the display panel when the input DBV is larger than the 128 gray scale, the 128 gray scale is used as a reference gray scale. It should be noted that the determination criterion of whether mura exists is well known by those skilled in the art and is not described herein, and meanwhile, the absence of mura when the gray scale is greater than 128 gray scale means that the mura degree of the display panel appearing when the gray scale is greater than 128 gray scale is far weaker than the mura degree of the display panel appearing when the gray scale is 128 gray scale, for example, the mura degree of the display panel appearing when the gray scale is greater than 128 gray scale is less than 1% of the mura degree of the display panel appearing when the gray scale is 128 gray scale; the degree of mura can be judged by human eyes or quantified by a quantification method. After the reference gray scale is determined, a gray scale picture under the minimum value of the preset DBV can be obtained, if the input DBV is increased from 0x000A to 0x00DF, a plurality of gray scale pictures under the input DBV when the input gray scale is different are obtained, if the plurality of pictures under the input DBV are obtained in the same way as when the input DBV is 0x000A, if mura still exists at the 128 gray scale, the input DBV is continuously increased, and if the input DBV is 0x019E, the mura does not exist at the 128 gray scale, 0x019E is used as the linkage DBV. It should be noted that, the linkage DBV can be a DBV with a gray scale greater than or equal to a reference gray scale in the preset DBV, and mura does not exist and the difference between the minimum value and the minimum value in the preset DBV is minimum, so that the linkage DBV can be closer to the minimum value in the preset DBV, and the compensation effect is better when the DBV is low. When the input DBV of display panel is less than linkage DBV, the DBV of display panel is less this moment, and when the input DBV of display panel is greater than linkage DBV, the input DBV of display panel is great, through carrying out the segmentation compensation to the region that display panel exists mura, the input grey scale is the same but input DBV is different (if input DBV is higher or when lower) compensation data is different at display panel, and then realize according to display panel's input DBV to display panel dynamic compensation, especially can promote the compensation effect when input DBV is lower, and then promote the display effect.
In the technical solution of this embodiment, the adopted compensation device includes: a first obtaining module 201, configured to obtain a gray scale picture of the display panel at a minimum value in a preset display brightness value DBV, and determine a maximum gray scale with mura according to the gray scale picture, where the maximum gray scale is used as a reference gray scale; a second obtaining module 202, configured to obtain a gray scale picture of the display panel except for a minimum value in a preset DBV, and determine a linkage DBV, where mura does not exist when a gray scale of the linkage DBV is greater than or equal to a reference gray scale; and the compensation module 203 is used for performing segmented compensation on the area of the display panel with mura by taking the linkage DBV as a segmented node. Through obtaining linkage DBV, carry out the segmentation compensation to the region that display panel exists the mura, the input grey scale is the same but the input DBV of display panel is different (if input DBV is higher or when lower) compensation data is different, and then realizes according to display panel's input DBV to display panel dynamic compensation, especially can promote the compensation effect when input DBV is lower, and then promotes the display effect.
Optionally, with continued reference to fig. 2, the compensation module 203 comprises: the first fitting module 2031 is configured to obtain, according to a preset mura compensation algorithm, gray scale compensation data when the input DBV of the display panel is a minimum value in the preset DBV and a linkage DBV, and to fit the data to obtain a first gray scale compensation formula, where the first gray scale compensation formula is a corresponding relationship between the input DBV, an input gray scale value, and the gray scale compensation data, and the input DBV corresponding to the first gray scale compensation formula is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; the second fitting module 2032 is configured to obtain, according to a preset mura compensation algorithm, a second gray-scale compensation formula by fitting, where the input DBV of the display panel is a maximum value in the preset DBV and gray-scale compensation data when the linkage DBV is obtained, where the second gray-scale compensation formula is a corresponding relationship between the input DBV, an input gray-scale value, and the gray-scale compensation data, and the input DBV corresponding to the second gray-scale compensation formula is less than or equal to the maximum value in the preset DBV and greater than or equal to the linkage DBV; the compensation submodule 2033 is configured to, at a stage where the input DBV of the display panel is greater than or equal to a minimum value in preset DBVs and less than or equal to a linkage DBV, compensate an area of the display panel where mura exists with gray-scale compensation data obtained by a first gray-scale compensation formula; and compensating the area of the display panel with mura by using compensation data obtained by a second gray scale compensation formula at the stage that the input DBV of the display panel is less than or equal to the maximum value in the preset DBV and is greater than the linkage DBV.
Specifically, when the preset mura compensation algorithm is used for obtaining gray scale compensation data when the input DBV of the display panel is the preset DBV, the algorithm is more mature, the obtained gray scale compensation data is more accurate, and meanwhile, the verification of the gray scale compensation data is facilitated; in the first gray scale compensation formula and the second gray scale compensation formula, the input DBV and the input gray scale value of the display panel are independent variables, and the gray scale compensation data are dependent variables, that is, when the input DBV and the input gray scale value of the display panel are obtained, the gray scale compensation data can be determined according to the input DBV and the input gray scale value, so that the mura area of the display panel is compensated, and the display effect is improved. It should be noted that the input DBV of the display panel can be input by a user, for example, the user adjusts the input DBV by adjusting the brightness bar of the display panel, and the input gray level value can be determined according to the required displayed frame. In the embodiment, the gray scale compensation data is related to both the input DBV and the input gray scale value of the display panel, and compared with the existing scheme that the gray scale compensation data is related to the input gray scale value only, the compensation effect is better, so that the display effect of the display panel is improved.
Optionally, the first compensation formula is: z-a 1 x + b1 y + c 1; and/or the second gray level compensation formula is: z-a 2 x + b2 y + c 2; z is gray scale compensation data, x is input DBV, and y is input gray scale value; a1, b1, c1, a2, b2 and c2 are all constants.
Specifically, the first gray scale compensation formula and the second gray scale compensation formula can both be linear formulas, so that the fitting difficulty of the first gray scale compensation formula and the second gray scale compensation formula can be reduced.
Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 3, the display device includes a storage module, where the storage module is configured to store gray-scale compensation data, and the gray-scale compensation data is obtained by a mura compensation method of a display panel according to any embodiment of the present invention. The display device can be a mobile phone, a tablet personal computer, a computer, mp3, mp4, a smart watch or other wearable devices, and the like, and the display device can internally comprise a storage module, such as a storage module in a processor or other storage modules, and the like, and is used for storing gray scale compensation data.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for mura compensation of a display panel, the method comprising:
acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale;
acquiring a gray scale picture of the display panel under the minimum value in the preset DBV, and determining a linkage DBV, wherein the linkage DBV does not have mura when the gray scale is larger than or equal to the reference gray scale;
and taking the linkage DBV as a segmented node, and performing segmented compensation on the area of the display panel with mura.
2. The method of claim 1, wherein the node segmented by the linkage DBV, and the segmented compensation of the mura area of the display panel comprises:
obtaining gray scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a first gray scale compensation formula through fitting, wherein the first gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the first gray scale compensation formula is greater than or equal to the minimum value in the preset DBV and smaller than or equal to the linkage DBV;
obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a second gray scale compensation formula through fitting, wherein the second gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the second gray scale compensation formula is less than or equal to the maximum value in the preset DBV and is greater than or equal to the linkage DBV;
compensating the area of the display panel with mura by using gray scale compensation data acquired by the first gray scale compensation formula at the stage that the input DBV of the display panel is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; and at the stage that the input DBV of the display panel is less than or equal to the maximum value in the preset DBV and is greater than the linkage DBV, compensating the area of the display panel with mura by using the gray scale compensation data acquired by the second gray scale compensation formula.
3. The method of claim 2, wherein the first gray level compensation formula is:
z＝a1*x+b1*y+c1；
and/or the second gray level compensation formula is as follows:
z＝a2*x+b2*y+c2；
the z is gray scale compensation data, the x is an input DBV, and the y is an input gray scale value; the a1, the b1, the c1, the a2, the b2 and the c2 are all constants.
4. The method of claim 2,
obtaining gray scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm, wherein the gray scale compensation data comprises the following steps:
obtaining a first corresponding relation between an input gray scale value and gray scale compensation data of the display panel under the current input DBV according to the preset mura compensation algorithm, and obtaining gray scale compensation data corresponding to a plurality of input gray scale values of the display panel under the current input DBV according to the first corresponding relation; and/or the presence of a gas in the gas,
obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm, wherein the gray scale compensation data comprises the following steps:
and obtaining a second corresponding relation between the input gray scale value of the display panel under the current input DBV and gray scale compensation data according to the preset mura compensation algorithm, and obtaining the gray scale compensation data corresponding to a plurality of input gray scale values of the display panel under the current input DBV according to the second corresponding relation.
5. The method of claim 2, wherein the pre-set mura compensation algorithm comprises:
the Parameter Type method or the Inverse Profile Type method.
6. The method according to claim 1, wherein the obtaining a gray scale picture of the display panel at a minimum value of preset display brightness values DBV and determining that a maximum gray scale of mura exists according to the gray scale picture, wherein the maximum gray scale serving as a reference gray scale comprises:
acquiring a minimum value of the display panel in a preset DBV (digital video), and a gray scale picture when the gray scale picture is a plurality of sampling gray scales, and determining that a mura maximum gray scale exists according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale; wherein the plurality of sampling gray levels comprises:
16 gray levels, 32 gray levels, 64 gray levels, 128 gray levels, and 196 gray levels.
7. A display panel mura compensating apparatus, comprising:
the first acquisition module is used for acquiring a gray scale picture of the display panel under the minimum value in a preset display brightness value DBV, and determining the maximum gray scale of mura according to the gray scale picture, wherein the maximum gray scale is used as a reference gray scale;
the second acquisition module is used for acquiring a gray scale picture of the display panel under the minimum value in the preset DBV and determining a linkage DBV, wherein the linkage DBV does not have mura when the gray scale is larger than or equal to the reference gray scale;
and the compensation module is used for carrying out sectional compensation on the area of the display panel with mura by taking the linkage DBV as a sectional node.
8. The display panel mura compensating apparatus of claim 7 wherein,
the compensation module includes:
the first fitting module is used for obtaining gray scale compensation data when the input DBV of the display panel is the minimum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a first gray scale compensation formula through fitting, wherein the first gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the first gray scale compensation formula is greater than or equal to the minimum value in the preset DBV and smaller than or equal to the linkage DBV;
the second fitting module is used for obtaining gray scale compensation data when the input DBV of the display panel is the maximum value in the preset DBV and the linkage DBV according to a preset mura compensation algorithm so as to obtain a second gray scale compensation formula through fitting, wherein the second gray scale compensation formula is a corresponding relation of the input DBV, an input gray scale value and the gray scale compensation data, and the input DBV corresponding to the second gray scale compensation formula is less than or equal to the maximum value in the preset DBV and is greater than or equal to the linkage DBV;
the compensation submodule is used for compensating the area of the display panel with mura by using gray scale compensation data acquired by the first gray scale compensation formula at the stage that the input DBV of the display panel is greater than or equal to the minimum value in the preset DBV and less than or equal to the linkage DBV; and at the stage that the input DBV of the display panel is less than or equal to the maximum value in the preset DBV and is greater than the linkage DBV, compensating the area of the display panel with mura by using the gray scale compensation data acquired by the second gray scale compensation formula.
9. The mura compensation apparatus of claim 8 wherein the first gray scale compensation formula is:
z＝a1*x+b1*y+c1；
and/or the second gray level compensation formula is as follows:
z＝a2*x+b2*y+c2；
the z is gray scale compensation data, the x is an input DBV, and the y is an input gray scale value; the a1, the b1, the c1, the a2, the b2 and the c2 are all constants.
10. A display device comprising a storage module for storing gray scale compensation data, wherein the gray scale compensation data is obtained by the method of any one of claims 1-6.
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