CN117392937B - Color point separation and demura method, device and system for white picture of display panel - Google Patents
Color point separation and demura method, device and system for white picture of display panel Download PDFInfo
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Abstract
The invention provides a color point separation and demura method, a device and a system of a white picture of a display panel, wherein the color point separation method comprises the following steps: determining a first image capturing image of a white picture displayed on a display panel acquired by a monochromatic camera under a transparent filter or a filter-free filter under a first gray scale; performing color point separation on the first imaging image based on the mask matrix of each primary color to obtain an image with separated color points of each primary color; the mask matrix of each primary color is obtained according to a second image capturing image of each primary color, which is obtained by capturing the white picture displayed by the display panel under the second gray scale under the filter of each primary color by the single-color camera; the gray scale value of the second gray scale is larger than the gray scale value of the first gray scale. The invention can separate the images of each primary color from the white picture acquired by the monochromatic camera so as to detect the mura defect of the white picture of the display panel, and perform the demura on the white picture of the display panel, thereby reducing the image acquisition time and having better demura effect compared with the primary color respectively lighting mode.
Description
Technical Field
The invention belongs to the field of display panel detection, and in particular relates to a color point separation and demura method, device and system for a white picture of a display panel.
Background
Display panels represented by liquid crystal displays (Liquid Crystal Display, LCDs) and Organic Light-Emitting diodes (OLEDs) are becoming increasingly popular in people's lives. However, the display panel undergoes a plurality of process steps in the preparation process, and each step may introduce flaws and defects, which ultimately affect the yield of the display panel and increase the cost, so that the display panel needs to be photographed in the production process, the brightness of each pixel is extracted, and then brightness uniformity correction (demura) is performed.
In a conventional display panel demux, each primary color is usually required to be lighted up, an image of each primary color is acquired, and then the demux for each primary color is realized by extracting the luminance of a subpixel for each primary color. Accordingly, when the display panel demura is needed to perform demura on display pictures with different gray scales, the display pictures displayed by the display panel are usually mainly white pictures, and for the OLED, especially in low gray scales, due to leakage current between adjacent color points, the brightness of the white pictures is not the sum of the measured brightness when each primary color picture is independently lighted. In which, in the worst case, a reddish screen may be observed at low gray levels, which is evidence of leakage currents in adjacent color points.
In summary, since the conventional display panel demux is implemented by respectively lighting the primary colors, the mode of respectively lighting the primary colors to capture an image and demux cannot meet the demand of demux for white screen, and a method for applying the same is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a color point separation and demura method, a device and a system for a white picture of a display panel, which aim to solve the problem that the prior mode of respectively lighting primary colors to carry out image capturing and demura cannot meet the demand of the white picture demura.
To achieve the above object, in a first aspect, the present invention provides a color point separation method for a white screen of a display panel, including:
determining a first image capturing image of a white picture displayed on a display panel acquired by a monochromatic camera under a transparent filter or a filter-free filter under a first gray scale;
performing color point separation on the first imaging image based on the mask matrix of each primary color to obtain an image with separated color points of each primary color;
the mask matrix of each primary color is obtained according to a second image capturing image of each primary color, which is obtained by capturing the white picture displayed by the display panel under the second gray scale under the filter of each primary color by the single-color camera; the gray scale value of the second gray scale is larger than the gray scale value of the first gray scale.
Specifically, the mask matrix is used to reflect the distribution of sub-pixel positions of the respective primary colors in the white picture of the camera. Colloquially, when a certain camera pixel corresponds to a certain primary color point, setting a matrix element value as a second value, and reflecting that the color point at the position corresponds to a certain preset primary color; if the matrix element value is the first value, the color point is reflected not to correspond to the preset primary color. The mask matrix for each primary color reflects the position distribution of the sub-pixels for that primary color.
Wherein, for facilitating subsequent calculation, the first value may be set to 0 and the second value may be set to 1.
In the case of performing demux on white images of a display panel, it is necessary to perform demux on white images of different gray scales, and therefore, it is necessary to perform color point separation on white images of different gray scales. The color point separation can be performed on the white picture in the mode of taking the image after the primary color filters, but in general, the exposure time required for taking the image of the low gray-scale white picture is longer than the exposure time required for taking the image of the high gray-scale white picture; therefore, if the color point separation is carried out by adopting the mode of respectively taking images by the primary color filters on the white pictures with different gray scales, the required exposure time is long when the gray scale value is smaller than a certain value; and because the white picture needs to be imaged by each primary color filter in turn, the exposure time under low gray scale is greatly increased, so that the imaging process under each gray scale is complicated and the imaging time is long, and the efficiency of demura is low.
In general, the positions of the sub-pixels of different primary colors under different gray scales are not changed and are relatively fixed. In addition, the gray level of the second gray level is larger than the gray level of the first gray level, which can be understood as the high gray level of the second gray level and the low gray level of the first gray level. The high gray level and the low gray level are relatively speaking, and the gray level is relatively high when the gray level is relatively large, and the gray level is relatively low when the gray level is relatively small.
It can be understood that the invention obtains each primary color image after color point separation by taking an image of a white picture through each primary color filter under high gray level, and then obtains a mask matrix of each primary color by binarizing the image after color point separation under high gray level. And then, under at least one low gray level, directly taking an image of the white picture or taking an image through a transparent filter, and then directly performing logical AND operation on the taken image of the white picture under the low gray level through the mask matrix of each primary color determined under the high gray level to obtain an image with color points of each primary color separated.
Specifically, the exposure time required at the high gray level is relatively low, and although the images with separated color points of the primary colors are required to be obtained through different primary color filters at the high gray level, only one operation for multiple image capturing operations is required, and then only one image capturing operation is required for the white image at the low gray level. Therefore, a mask matrix of each primary color can be obtained by adopting a shorter exposure time, a white picture with low gray scale can be obtained by adopting a shorter exposure time, and finally, an image with separated primary color points can be obtained by carrying out simple logical AND operation on the white picture with low gray scale through the mask matrix.
In one possible implementation manner, the obtaining, by the mask matrix of each primary color, the second captured image obtained by capturing, according to the monochrome camera, a white image displayed by the display panel at the second gray level under the filter of each primary color, respectively, includes:
and binarizing the second imaging image of each primary color to obtain a mask matrix of the corresponding primary color.
In one possible implementation manner, the color point separation of the first captured image by the mask matrix based on each primary color further includes:
performing logical AND operation on the mask matrixes of the primary colors to obtain a position matrix corresponding to the overlapped pixels; the overlapping pixels refer to the brightness of one pixel location contributed by at least two primary colors;
obtaining a scale factor reflecting the contribution proportion of each primary color overlapped at each overlapped pixel to the brightness according to the second imaging image of each primary color and the corresponding position matrix;
correcting the mask matrix of each primary color based on the scale factors to obtain a corrected gray scale mask matrix of each primary color;
and performing color point separation on the first imaging image based on the corrected gray scale mask matrix of each primary color to obtain an image with separated color points of each primary color.
It should be noted that, under the condition that overlapping pixels exist on the display panel, assuming that the contribution ratio of the position of the overlapping pixels at the high gray level and the position of the overlapping pixels at the low gray level and the contribution ratio of different color points at the position remain unchanged, a corrected gray level mask matrix can be obtained at the high gray level first, and then the corrected gray level mask matrix is utilized to directly calculate the white picture at the low gray level to obtain the image after color point separation.
Specifically, the matrix elements of the modified gray-scale mask matrix have gray-scale values that are not binary.
In one possible implementation manner, the obtaining, according to the second captured image of each primary color and the corresponding position matrix, a scaling factor reflecting a proportion that each primary color overlapped at each overlapped pixel contributes to brightness, includes:
performing logical AND operation on each position matrix and the second imaging images of the two corresponding primary colors respectively to obtain brightness contribution values of each primary color at each overlapped pixel;
the scale factor is obtained by determining the proportion of the primary colors contributing to the luminance at each overlapping pixel based on the luminance contribution values of the different primary colors at that overlapping pixel.
In one example, the color point separation is performed on the first captured image based on a mask matrix of each primary color or a corrected gray scale mask matrix of each primary color, specifically: and respectively calculating the mask matrix or the corrected gray-scale mask matrix of each primary color with the first imaging image to obtain an image with separated color points of each primary color. The color point separated image is an image obtained by obtaining each primary color, and only one primary color is displayed in the image.
Specifically, the above operation refers to multiplication of matrix elements at corresponding positions.
In the present invention, the ratio of the contribution of each primary color at the overlapping pixels with the default low gray scale is the same as the ratio of the contribution of each primary color at the overlapping pixels with the high gray scale. Even though there is a small difference in the contribution ratio of each primary color at the overlapping pixels under different gray scales, the error introduced by the difference is not enough to affect the brightness extraction and demura effect of the display panel, so the color point separation method provided by the invention can be widely applied.
In one possible implementation manner, the color point separation method of the white screen of the display panel is executed by an operation module of the image capturing device.
In a second aspect, the present invention provides a demura method of a display panel, including:
obtaining an image with separated color points of each primary color based on the color point separation method of the white screen of the display panel described in the first aspect or any possible implementation manner of the first aspect;
and performing demura processing on the white picture displayed under the first gray scale of the display panel based on the images separated by the color points of the primary colors.
It will be appreciated by those skilled in the art that the white color point separation method provided in the first aspect can directly separate the images of each primary color from the low-gray-scale white screen based on the mask matrix obtained in advance, and then locate and extract the sub-pixels based on the images of each primary color, so as to perform demura on the white screen of the display panel according to the extracted brightness, and eliminate the brightness non-uniformity.
In addition, when the display panel demura is used, it is necessary to perform luminance compensation for each of the sub-pixels of each of the primary colors, but the conventional method of individually lighting each of the primary colors is only capable of performing luminance compensation for the display panel screen when each of the primary colors is individually lit, and is not capable of performing luminance compensation for the white screen when all of the primary colors are lit together. Further, there is an inconsistency (due to load imbalance or leakage current, etc.) between the luminance of the sub-pixel extracted when each primary color is individually turned on and the luminance of the sub-pixel extracted when all primary colors are turned on; the invention extracts the images of each primary color based on the white picture, and then extracts the corresponding brightness to perform demura, so that the inconsistency can be well overcome, the demura of the white picture of the display panel is well realized, and the scheme of the invention is simple and efficient to operate, thus having good application prospect.
In a third aspect, the present invention provides a color point separating device for a white screen of a display panel, including:
the device comprises a monochromatic camera, a filter device and an operation unit, wherein the filter device is provided with a filtering state and a transparent state of a plurality of primary colors;
the monochrome camera is used for acquiring a first image capturing image of a display panel displaying a white picture under a first gray level when the filter device is in a transparent state, and also used for respectively capturing images of the display panel displaying a white picture under a second gray level when the filter device is in a filtering state of multiple primary colors to obtain a second image capturing image of each primary color, wherein the gray level value of the second gray level is larger than that of the first gray level;
the operation unit is used for carrying out operation on the second imaging image to obtain a mask matrix of each primary color,
the operation unit is further configured to perform color point separation on the first captured image based on the mask matrix of each primary color, so as to obtain an image with color points separated for each primary color.
In one possible implementation manner, the operation unit is further configured to logically and-operate the mask matrices of each primary color two by two to obtain a position matrix corresponding to the overlapped pixel; the overlapping pixels refer to the brightness of one pixel location contributed by at least two primary colors; obtaining a scale factor reflecting the contribution proportion of each primary color overlapped at each overlapped pixel to the brightness according to the second imaging image of each primary color and the corresponding position matrix; correcting the mask matrix of each primary color based on the scale factors to obtain a corrected gray scale mask matrix of each primary color; and performing color point separation on the first imaging image based on the corrected gray scale mask matrix of each primary color to obtain an image with separated color points of each primary color.
In one possible implementation manner, the operation unit performs logical and operation on each position matrix and the second captured images of the two corresponding primary colors respectively to obtain brightness contribution values of the primary colors at each overlapped pixel; and determining the proportion of each primary color contributing to the brightness at each overlapped pixel based on the brightness contribution value of different primary colors at the overlapped pixel, thereby obtaining the proportion factor.
In one possible implementation, the arithmetic unit is integrated within the monochrome camera.
In a fourth aspect, the present invention provides a demura system of a display panel, including:
a color point separation unit, configured to obtain an image with separated color points of each primary color according to the color point separation method of the white screen of the display panel described in the first aspect or any possible implementation manner of the first aspect;
and the Demura unit is used for carrying out Demura processing on the white picture displayed under the first gray scale of the display panel based on the image separated by the color points of the primary colors.
In a fifth aspect, the present invention provides an electronic device, comprising: at least one memory for storing a program; at least one processor for executing a memory-stored program, which when executed is adapted to carry out the method of the first aspect, any one of the possible implementations of the first aspect or the second aspect.
In a sixth aspect, the present invention provides a computer readable storage medium storing a computer program which, when run on a processor, causes the processor to perform the method of the first aspect, any one of the possible implementations of the first aspect or the second aspect.
In a seventh aspect, the invention provides a computer program product which, when run on a processor, causes the processor to perform the method of the first aspect, any one of the possible implementations of the first aspect or the second aspect.
It will be appreciated that the advantages of the third to seventh aspects may be found in the relevant description of the first and/or second aspects and are not described in detail herein.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
the invention provides a color point separation and demura method, a device and a system for a white picture of a display panel, which utilize the characteristics of a camera exposure time period under high gray level, determine a mask matrix of each primary color through an image capturing image after passing through each primary color filter under high gray level, and then utilize the mask matrix to calculate the single image capturing image of the white picture under low gray level to obtain an image after separating the color points of the primary colors, thereby minimizing the image acquisition time, greatly shortening the exposure time of the camera, furthest reducing errors caused by lens distortion and chromatic dispersion, simplifying the image acquisition step, and separating the color points of the white picture by adopting simple calculation.
The invention provides a color point separation and demura method, a color point separation and demura device and a color point separation and demura system for a white picture of a display panel, which can realize high-resolution color point separation by using a monochromatic camera to replace a color camera and reduce hardware cost. Because the mask matrix obtained under the high gray level can be suitable for the low gray level scene, and each low gray level only needs to shoot a white picture once, the shooting time is shortened, and especially, the white picture is shot only once under the lower gray level without a filter or a lens filter, the light intensity loss caused by the existence of each primary color filter is avoided, and the accuracy of image acquisition is ensured.
The invention provides a color point separation and demux method, device and system for a white picture of a display panel, which can directly separate the color point of the white picture, and then demux the white picture of the display panel according to the separated image, thereby being capable of better adapting to the demux requirement of the white picture of the display panel and improving the accuracy of the demux of the white picture of the display panel.
Drawings
FIG. 1 is a flow chart of a color point separation method for a white frame of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of acquiring each primary color mask according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a color point separation process of a white screen with low gray scale according to an embodiment of the present invention;
fig. 4 (a) is a schematic diagram of calculating a contribution ratio of each primary color in an overlapped pixel according to an embodiment of the present invention;
FIG. 4 (b) is a schematic flow chart of mask correction according to an embodiment of the present invention;
FIG. 5 (a) is a schematic diagram of a mask for R primary color according to an embodiment of the present invention;
FIG. 5 (b) is a schematic diagram of a mask for the G primary color provided by an embodiment of the present invention;
FIG. 5 (c) is a schematic diagram of a mask for the B primary color provided by an embodiment of the present invention;
FIG. 6 is a flowchart of a method for removing white images of a display panel according to an embodiment of the present invention;
FIG. 7 is a color point separating device frame diagram of a white frame of a display panel according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a display panel white-screen demura system according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The term "and/or" herein is an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. The symbol "/" herein indicates that the associated object is or is a relationship, e.g., A/B indicates A or B.
The terms "first" and "second" and the like in the description and in the claims are used for distinguishing between different objects and not for describing a particular sequential order of objects. For example, the first captured image and the second captured image are used to distinguish between different captured images, rather than to describe a particular order of captured images.
In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
Next, the technical scheme provided in the embodiment of the present invention is described.
FIG. 1 is a flow chart of a color point separation method for a white frame of a display panel according to an embodiment of the present invention; as shown in fig. 1, the method comprises the following steps:
s101, determining a first image capturing image of a white picture displayed on a display panel acquired by a monochromatic camera under a transparent filter or no filter under a first gray scale;
s102, performing color point separation on the first imaging image based on a mask matrix of each primary color to obtain an image with separated color points of each primary color;
the mask matrix of each primary color is obtained according to a second image capturing image of each primary color, which is obtained by capturing the white picture displayed by the display panel under the second gray scale under the filter of each primary color by the single-color camera; the gray scale value of the second gray scale is larger than the gray scale value of the first gray scale.
In particular, primary color refers to the basic color that the display panel uses in the optical and visual fields to create all other colors. Common display screen primaries are Red (Red, R), green (G), and Blue (B), which are also known as RGB primaries. The invention is not limited to any specific combination of primary colors, and in the specific embodiment of the invention, only three primary colors of RGB are used for illustration.
FIG. 2 is a schematic flow chart of acquiring each primary color mask according to an embodiment of the present invention; as shown in fig. 2, taking RGB three primary colors as an example, the process of obtaining each primary color mask is as follows:
step 1, displaying a white picture under high gray scale;
step 2, taking images under R, G, B filters respectively, and obtaining R images P_r, G images P_g and B images P_b which correspond to the color point separation under high gray scale;
step 3, binarizing p_r, p_g and p_b to obtain masks of R primary color, G primary color and B primary color respectively: m_ R, M _g and m_b.
Further, the mask matrix is generated by binarizing an image obtained by taking an image of a white screen of the display panel under a filter of each primary color.
In one example, the binarization process may be: when the brightness of a certain pixel is larger than the preset value, the binarization of the pixel is 1, and otherwise, the binarization is 0.
It should be noted that the high gray level and the low gray level mentioned in the present invention are relatively, and the high gray level may be set to a gray level maximum value, for example 255, or greater than a certain relatively high gray level value, for example, greater than 200, etc. In short, the present invention can be applied to color point separation for a white screen having a relatively small gray scale value, as long as the mask is specified based on a white screen having a large gray scale value.
FIG. 3 is a schematic diagram of a color point separation process of a white screen with low gray scale according to an embodiment of the present invention; as shown in fig. 3, at least one low-gray-level white picture can be obtained through a monochrome camera without a filter or through a transparent filter, and then the low-gray-level white picture is processed based on the masks of the primary colors obtained in fig. 2, so as to obtain a three-channel separation picture under each gray level.
Specifically, the low gray-scale value may be set to 128, 32, 16, or the like, and a specific gray-scale value may be set according to actual needs by those skilled in the art.
Further, the filter-less filter or the transparent filter may be a K filter.
In the case of using the mask described above, there may be a problem of overlapping pixels in order to reduce the resolution required for the camera or the color point separation processing of the captured image, and therefore, the fine reduction can be performed by using the separation contribution ratio. Fig. 4 (a) is a schematic diagram of calculating a contribution ratio of each primary color in an overlapped pixel according to an embodiment of the present invention; as shown in fig. 4 (a), the method comprises the following steps:
first, in step 3 of the R, G, B, K filter method, m_ R, M _g and m_b are multiplied by each other to obtain a position matrix of overlapping pixel positions: the position matrix m_rg of the R-primary and G-primary overlapping pixels, the position matrix m_gb of the G-primary and B-primary overlapping pixels, and the position matrix m_br of the B-primary and R-primary overlapping pixels.
Further, the position matrix m_rg of the overlapping pixels is multiplied by p_r and p_g, respectively, to obtain the luminance contribution matrix o_r of the R primary color at the overlapping position and the luminance contribution matrix o_g of the G primary color at the overlapping position, which are obtained from the position matrix m_rg, and similarly, the luminance contribution value of each corresponding primary color at the overlapping position is obtained by multiplying the other two position matrices by the corresponding captured images, respectively.
For example, the luminance contribution values at the corresponding positions of the corresponding luminance contribution matrix are normalized to obtain the corresponding scale factor matrix, and the above process can be understood as follows: and determining the brightness contribution ratio of each primary color at each position according to the brightness contribution value of each primary color at each position, taking the corresponding contribution ratio as an element of a matrix, and setting other elements of the matrix to 0 to obtain a scale factor matrix of the contribution ratio of each primary color.
As shown in fig. 4 (a), normalizing o_r and o_g, respectively, will result in a corresponding scale factor matrix: o_rg_r and o_rg_g.
FIG. 4 (b) is a schematic flow chart of mask correction according to an embodiment of the present invention; referring to fig. 4 (b), taking the correction mask m_r as an example: multiplying the normalized matrixes O_rg_r and O_br_r with corresponding position matrix elements of M_R respectively to obtain two multiplied matrixes which respectively correspond to contribution scale factors of red in the red-green overlapped pixels and the red-blue overlapped pixels; subtracting M_rg and M_br from M_R to obtain a subtracted matrix, wherein the contribution ratio of red photosensitive pixels corresponding to non-overlapped pixels is 100%; finally, adding the two multiplied matrixes and the subtracted matrix to obtain a M_R corrected gray-scale mask matrix. The correction process of the masks m_g and m_b can be referred to as correction of m_r, and will not be described herein.
In particular, the multiplication referred to herein refers to multiplication or logical and operation of matrix elements at corresponding positions.
Thus, the gray scale correction mask matrix of each primary color on all overlapped pixels can be obtained, and the gray scale correction values are used for replacing the corresponding matrix elements of the overlapped pixels in the original binarization mask matrix, so that the correction mask matrix of the whole picture is obtained, and the gray scale correction mask matrix is obtained.
In one embodiment, assuming 9×9 pixels on the display panel, the mask matrix M_R for the R primary color isThe method comprises the steps of carrying out a first treatment on the surface of the Mask matrix M_G of the G primary color is +.>The method comprises the steps of carrying out a first treatment on the surface of the Mask matrix M_B of primary color B is +.>The method comprises the steps of carrying out a first treatment on the surface of the The first position matrix M_rg obtained by performing logical AND operation on the R primary color mask matrix and the G primary color mask matrix is +.>The second position matrix M_br obtained by performing logical AND operation on the R primary color mask matrix and the B primary color mask matrix is +.>A third position matrix M_gb obtained by performing logical AND operation on the B primary color mask matrix and the G primary color mask matrix is +.>。
Further, if the R image p_r obtained by the primary color filter at the high gray level isG picture P_g is +.>B picture P_b is +.>The method comprises the steps of carrying out a first treatment on the surface of the R picture +.>Respectively performing logic AND with the first position matrix M_rg and the second position matrix M_br to respectively obtain brightness contribution value O_rg_R of R primary color in each pixel as +.>And O_br_R is +.>The method comprises the steps of carrying out a first treatment on the surface of the G image +.>Respectively with the first position matrix M_rg and the first position matrixThe three-position matrix M_gb is logically ANDed to obtain the brightness contribution value O_rg_G of the G primary color in each pixel asAnd O_gb_G is +.>The method comprises the steps of carrying out a first treatment on the surface of the B picture +.>Respectively carrying out logical AND with the second position matrix M_br and the third position matrix M_gb to respectively obtain brightness contribution values O_br_B of B primary colors in each pixel asAnd O_gb_B is +.>。
The matrix of the luminance contribution values, such as o_rg_ R, O _br_r, is a non-normalized matrix. And o_rg_r and o_br_r etc. are corresponding normalized scaling factor matrices derived from different overlapping position matrices.
Further, for the convenience of calculation, the brightness contribution ratio of a primary color at different overlapping pixels may be used as an element value of a matrix, and other element values of the matrix are set to 0, so as to obtain a scale factor matrix of the primary color.
Then, referring to the previous example, the contribution ratio of each primary color at each pixel position is determined according to the result obtained above, and for the R primary color, the scale factor matrix corresponding to the contribution ratio of each primary color at each pixel position isFor the G primary color, the proportion factor matrix corresponding to the contribution proportion of each pixel position isFor the B primary color, the corresponding scale factor matrix of the contribution ratio of each pixel position is +.>。
Further, the mask matrix of each primary color is multiplied by the scale factor matrix of each primary color, so as to obtain the value of the corrected gray-scale mask matrix element of the primary color on each overlapped pixel.
It will be appreciated that, with reference to the previous example, the mask matrix M_R for the R primary color prior to correction isThe method comprises the steps of carrying out a first treatment on the surface of the Mask matrix M_G of the G primary color is +.>The method comprises the steps of carrying out a first treatment on the surface of the Mask matrix M_B of primary color B is +.>The method comprises the steps of carrying out a first treatment on the surface of the After correction by the scale factor matrix, the corrected gray-scale mask matrix of the R primary color is +.>Is->Correction gray-scale mask matrix of G primary color>Is thatCorrection gray-scale mask matrix of B primary color>Is->。
It should be noted that, for a white screen, it is assumed that the overlapping pixels and contribution ratio of the high gray level are still suitable for the low gray level, and the error caused by this may not be enough to affect the demura result. In addition, the errors of this assumption can be subtly checked with experimental data.
The invention uses the mentioned red-green-blue mask for locating pixels with overlapping red-green-blue color point contributions with adjacent RGB points, wherein the contribution ratio of the adjacent red-green-blue color points to overlapping pixels is calculated by taking the image under the red-green-blue filter as input; the contribution ratio of the overlapping pixels is used as a correction term for the mask, and the revised mask replaces the binarized mask with a gray-scale mask; the gray scale mask is then used to process the white picture image taken at other gray scales to separate the red, green and blue dots to produce separate red, green and blue images.
Fig. 5 (a) to 5 (c) are schematic diagrams of masks of R, G, and B primary colors according to an embodiment of the present invention; the brightness at the corresponding pixel position can be set according to the obtained mask matrix of each primary color and different matrix values, and then the mask schematic diagram is obtained.
The invention uses a high-resolution monochromatic camera to shoot a white picture, and simultaneously lights red, green and blue sub-pixels on a display panel; the position of the rgb sub-pixels can be determined by taking an additional set of rgb filters at a selected gray level using rgb filters, typically with a higher gray level selected to shorten the required exposure time. By binarizing the image taken under the color filter, a corresponding red, green and blue mask of sub-pixel positions is generated.
Further, a white image of simultaneously lit red, green and blue pixels is photographed for each gray level required for demura, and a mask is applied to each white frame to separate red, green and blue color points in the white image, thereby obtaining an image with separated color points.
FIG. 6 is a flowchart of a method for removing white images of a display panel according to an embodiment of the present invention; as shown in fig. 6, the method comprises the following steps:
s201, obtaining an image with separated color points of each primary color based on the color point separation method of the white picture of the display panel provided by FIG. 1;
s202, performing demura processing on a white picture displayed at a first gray level of the display panel based on the images separated by the color points of the primary colors.
It should be noted that the present invention can utilize the existing mature demura algorithm to perform demura processing to compensate for the uneven brightness of the display panel. The invention is not limited to a specific demura process, and a person skilled in the art can select a suitable algorithm according to the need.
FIG. 7 is a block diagram of a color point separating device for white images of a display panel according to an embodiment of the present invention; as shown in fig. 7, the apparatus includes: a monochrome camera 710, a filter device 720, and an arithmetic unit 730.
The filter device 720 has a filtering state and a transparent state of a plurality of primary colors;
the monochrome camera 710 is configured to obtain, when the filter device 720 is in a transparent state, a first image capturing image of a display panel displaying a white screen at a first gray level, and further configured to respectively capture, when the filter device 720 is in a filtering state of multiple primary colors, images of the display panel displaying the white screen at a second gray level to obtain second image capturing images of the primary colors, where a gray level value of the second gray level is greater than a gray level value of the first gray level;
the operation unit 730 is configured to perform an operation on the second captured image to obtain a mask matrix of each primary color,
the operation unit 730 is further configured to perform color point separation on the first captured image based on the mask matrix of each primary color, so as to obtain an image with color points of each primary color separated.
Further, the operation unit 730 is further configured to perform logical and operation on the mask matrices of each primary color to obtain a position matrix corresponding to the overlapped pixel; the overlapping pixels refer to the brightness of one pixel location contributed by at least two primary colors; obtaining a scale factor reflecting the contribution proportion of each primary color overlapped at each overlapped pixel to the brightness according to the second imaging image of each primary color and the corresponding position matrix; correcting the mask matrix of each primary color based on the scale factors to obtain a corrected gray scale mask matrix of each primary color; and performing color point separation on the first imaging image based on the corrected gray scale mask matrix of each primary color to obtain an image with separated color points of each primary color.
In one example, the arithmetic unit 730 is integrated within the monochrome camera 710.
As shown in fig. 7, for convenience of operation, the R filter, the B filter, the G filter, and the K filter (i.e., the transparent filter or the non-filter) may be manufactured as a rotatable filter group, and different filters are selected by rotating the filter group to filter the white screen, and then a monochrome camera is used to capture an image.
In one example, the present invention may use a monochrome camera with red, green, and blue filters to capture images and to help separate the position and size of red, green, and blue pixels in the captured image. For example, one skilled in the art can also select other cameras or image capturing devices to capture images as long as the corresponding pictures can be captured.
FIG. 8 is a schematic diagram of a display panel white demura system according to an embodiment of the invention; as shown in fig. 8, the system includes:
a color point separation unit 810, configured to obtain color point separated images of the primary colors according to the color point separation method of the white screen of the display panel described in the first aspect or any possible implementation manner of the first aspect;
and a demux unit 820 for performing demux processing on the white screen displayed on the first gray scale of the display panel based on the separated images of the color points of the primary colors.
It should be understood that the apparatus and system shown in fig. 7 and fig. 8 are used to perform the method in the foregoing embodiments, and the corresponding program units in the apparatus and system implement principles and technical effects similar to those described in the foregoing methods, and the operation of the apparatus and system may refer to the corresponding processes in the foregoing methods, which are not repeated herein.
Based on the method in the above embodiment, the embodiment of the invention provides an electronic device. The apparatus may include: at least one memory for storing programs and at least one processor for executing the programs stored by the memory. Wherein the processor is adapted to perform the method described in the above embodiments when the program stored in the memory is executed.
Based on the method in the above embodiment, the embodiment of the present invention provides a computer-readable storage medium storing a computer program, which when executed on a processor, causes the processor to perform the method in the above embodiment.
Based on the method in the above embodiments, an embodiment of the present invention provides a computer program product, which when run on a processor causes the processor to perform the method in the above embodiments.
It is to be appreciated that the processor in embodiments of the invention may be a central processing unit (centralprocessing unit, CPU), other general purpose processor, digital signal processor (digital signalprocessor, DSP), application specific integrated circuit (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic device, transistor logic device, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.
The steps of the method in the embodiment of the present invention may be implemented by hardware, or may be implemented by executing software instructions by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory (random access memory, RAM), flash memory, read-only memory (ROM), programmable ROM (PROM), erasable programmable PROM (EPROM), electrically erasable programmable EPROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present invention, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted across a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.
It will be appreciated that the various numerical numbers referred to in the embodiments of the present invention are merely for ease of description and are not intended to limit the scope of the embodiments of the present invention.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A color point separation method for a white picture of a display panel, comprising:
determining a first image capturing image of a white picture displayed on a display panel acquired by a monochromatic camera under a transparent filter or a filter-free filter under a first gray scale;
performing color point separation on the first imaging image based on the mask matrix of each primary color to obtain an image with separated color points of each primary color;
the mask matrix of each primary color is obtained by binarizing a second imaging image of each primary color, which is obtained by taking an image of a white picture displayed by the display panel under a second gray scale, under a filter of each primary color according to the monochromatic camera; the gray scale value of the second gray scale is larger than the gray scale value of the first gray scale.
2. The method of claim 1, wherein the color point separating the first captured image based on the mask matrix of primary colors further comprises:
performing logical AND operation on the mask matrixes of the primary colors to obtain a position matrix corresponding to the overlapped pixels; the overlapping pixels refer to the brightness of one pixel location contributed by at least two primary colors;
obtaining a scale factor reflecting the contribution proportion of each primary color overlapped at each overlapped pixel to the brightness according to the second imaging image of each primary color and the corresponding position matrix;
correcting the mask matrix of each primary color based on the scale factors to obtain a corrected gray scale mask matrix of each primary color;
and performing color point separation on the first imaging image based on the corrected gray scale mask matrix of each primary color to obtain an image with separated color points of each primary color.
3. The method according to claim 2, wherein obtaining a scale factor reflecting a proportion of each primary color overlapping at each overlapping pixel to each contribution to brightness according to the position matrix of the second captured image of each primary color corresponding to the overlapping pixel, comprises:
performing logical AND operation on each position matrix and the second imaging images of the two corresponding primary colors respectively to obtain brightness contribution values of each primary color at each overlapped pixel;
the scale factor is obtained by determining the proportion of the primary colors contributing to the luminance at each overlapping pixel based on the luminance contribution values of the different primary colors at that overlapping pixel.
4. A method according to claim 2 or 3, wherein the operation of generating the modified gray scale mask matrix comprises multiplying the mask matrix for each primary color by the matrix corresponding position of the corresponding primary color scale factor; the matrix of scale factors is determined from the scale factors of the primary colors at each overlapping pixel.
5. A demura method of a display panel, comprising:
obtaining an image with separated primary color points based on the color point separation method of the display panel white screen of any one of claims 1 to 4;
and performing demura processing on the white picture displayed under the first gray scale of the display panel based on the images separated by the color points of the primary colors.
6. A color point separation device for a white picture of a display panel, comprising:
the device comprises a monochromatic camera, a filter device and an operation unit, wherein the filter device is provided with a filtering state and a transparent state of a plurality of primary colors;
the monochrome camera is used for acquiring a first image capturing image of a display panel displaying a white picture under a first gray level when the filter device is in a transparent state, and also used for respectively capturing images of the display panel displaying a white picture under a second gray level when the filter device is in a filtering state of multiple primary colors to obtain a second image capturing image of each primary color, wherein the gray level value of the second gray level is larger than that of the first gray level;
the operation unit is used for binarizing the second imaging image to obtain mask matrixes of the primary colors,
the operation unit is further configured to perform color point separation on the first captured image based on the mask matrix of each primary color, so as to obtain an image with color points separated for each primary color.
7. The apparatus of claim 6, wherein the device comprises a plurality of sensors,
the arithmetic unit is also used for the purpose of,
performing logical AND operation on the mask matrixes of the primary colors to obtain a position matrix corresponding to the overlapped pixels; the overlapping pixels refer to the brightness of one pixel location contributed by at least two primary colors;
obtaining a scale factor reflecting the contribution proportion of each primary color overlapped at each overlapped pixel to the brightness according to the second imaging image of each primary color and the corresponding position matrix;
correcting the mask matrix of each primary color based on the scale factors to obtain a corrected gray scale mask matrix of each primary color;
and performing color point separation on the first imaging image based on the corrected gray scale mask matrix of each primary color to obtain an image with separated color points of each primary color.
8. The apparatus of claim 6, wherein the arithmetic unit is integrated within the monochrome camera.
9. A demura system of a display panel, comprising:
a color point separation unit for obtaining color point separated images of respective primary colors based on the color point separation method of a display panel white screen as defined in any one of claims 1 to 4;
and the Demura unit is used for carrying out Demura processing on the white picture displayed under the first gray scale of the display panel based on the image separated by the color points of the primary colors.
10. An electronic device, comprising:
at least one memory for storing a program;
at least one processor for executing the memory-stored program, which processor is adapted to perform the method of any one of claims 1-4 or claim 5 when the memory-stored program is executed.
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