CN109192126B - Image processing method of display panel - Google Patents
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- CN109192126B CN109192126B CN201811177479.0A CN201811177479A CN109192126B CN 109192126 B CN109192126 B CN 109192126B CN 201811177479 A CN201811177479 A CN 201811177479A CN 109192126 B CN109192126 B CN 109192126B
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Abstract
The invention discloses an image processing method of a display panel, wherein image data of the display panel is divided into at least two adjacent sub-display areas for display, and the image processing method of the display panel comprises the following steps: selecting a first side processing area and a second side processing area from the boundary lines towards two different sides respectively by taking the boundary lines of two adjacent sub-display areas as a reference; determining the position of a pixel to be displayed in a first side processing area or a second side processing area, and obtaining a gain value and an output gray-scale value of the pixel to be displayed according to the position of the pixel to be displayed; and calculating the product of the gain value of the pixel to be displayed and the output gray-scale value to obtain the actual gray-scale value of the pixel to be displayed, and writing data voltage into the pixel to be displayed according to the actual gray-scale value. The invention determines the gain value and the output gray-scale value of the image data according to the position of the pixel, and adjusts the output gray-scale value by integrating the gain value and drives the pixel to be displayed, thereby being capable of fading the boundary line of the image data.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to an image processing method of a display panel.
Background
With the continuous updating of panel technologies, large-size panel designs with high pixel and high refresh rates continue to increase. In consideration of manufacturing technology or cost, a large-sized panel with high pixel and high refresh rate is designed to have a double-side driving scheme or a single 2 TCON (Timing Controller) scheme, image data division has an up-down split-screen driving scheme or a left-right split-screen driving scheme, and gate lines on both sides of a division boundary line are respectively driven and scanned to display the image data.
Due to the influence of various external factors, mura (color spots) phenomenon often exists at the segmentation junctions of the image data, the Block size (Block size, namely the minimum unit of algorithm processing) of the demura (color spot removal) algorithm of a common high-resolution screen is generally 16 × 16 pixels, the junctions are difficult to be adjusted completely, and discontinuous image display phenomenon occurs.
Disclosure of Invention
In view of the shortcomings of the prior art, the present invention provides an image processing method for a display panel, which can effectively fade the boundary line of the image data of the panel.
In order to achieve the purpose, the invention adopts the following technical scheme:
an image processing method of a display panel, wherein image data of the display panel is divided into at least two adjacent sub-display areas for display, the image processing method of the display panel comprises the following steps:
taking the boundary of two adjacent sub-display areas as a reference, and respectively selecting a first side processing area and a second side processing area from the boundary towards two different sides;
determining the position of a pixel to be displayed in the first side processing area or the second side processing area, and obtaining a gain value and an output gray-scale value of the pixel to be displayed according to the position of the pixel to be displayed;
and calculating the product of the gain value of the pixel to be displayed and the output gray-scale value to obtain the actual gray-scale value of the pixel to be displayed, and writing data voltage into the pixel to be displayed according to the actual gray-scale value.
As an implementation manner, the determining the position of the pixel to be displayed in the first side processing area or the second side processing area includes: dividing the first side processing area and the second side processing area into M rows and N columns of partitions respectively, wherein the dividing line is parallel to the row direction, and M, N is an integer not less than 2;
the obtaining of the gain value of the pixel to be displayed according to the position of the pixel to be displayed includes: and searching a gain table of the first side processing area or a gain table of the second side processing area according to the row number and the column number of the partition where the pixel to be displayed is located, and obtaining a gain value of the pixel to be displayed.
In one embodiment, the length/width of each of the partitions is an integer multiple of the length/width of a single pixel.
As an embodiment, the length/width of at least one of the partitions is greater than the length/width of a single pixel, and the gain value of each of the gain table of the first-side processing region and the gain table of the second-side processing region varies linearly in the row direction and the column direction in the partition having the length/width greater than the length/width of the single pixel.
As one embodiment, at least one of M, N is no greater than 8.
In one embodiment, the gain table of the first side processing region and the gain table of the second side processing region record gain values of intersection positions of row partition lines and column partition lines of each partition;
the obtaining of the gain value of the pixel to be displayed according to the position of the pixel to be displayed includes:
judging whether the pixel to be displayed is at the intersection point position of the row partition line and the column partition line;
if so, the gain value corresponding to the intersection point position of the row partition line and the column partition line is the gain value of the pixel to be displayed; if not, then,
and acquiring gain values corresponding to intersection points of four different row partition lines and column partition lines which surround the pixel to be displayed, and calculating the gain value of the pixel to be displayed according to a linear interpolation method.
As an embodiment, the deriving an output gray-scale value according to the position of the pixel to be displayed includes:
acquiring output gray-scale values of pixels in a previous row of the pixels to be displayed and output gray-scale values of pixels in a current row, and searching a first gray-scale table of the first side processing area or a second gray-scale table of the second side processing area to obtain output gray-scale values;
the first gray scale table and the second gray scale table record lookup values corresponding to output gray scale values of two adjacent rows of pixels, and the lookup values are the output gray scale values of the pixels to be displayed.
In one embodiment, in the first gray scale table and the second gray scale table, the output gray scale values of the previous row of pixels and the output gray scale values of the current row of pixels are used as lookup nodes, the output gray scale value range of the previous row of pixels and the output gray scale value range of the current row of pixels are divided into a plurality of gray scale partitions, at least one of the gray scale partitions includes a plurality of gray scale values, and the output gray scale values of the same row of pixels in the gray scale partition including the plurality of gray scale values are linearly changed.
As an implementation manner, the deriving an output gray-scale value according to a position of the pixel to be displayed further includes:
judging whether the output gray-scale values of the pixels in the previous row of the pixels to be displayed and the output gray-scale values of the pixels in the current row both fall at the end points of the gray-scale subareas;
if so, the output gray-scale value of the pixel in the previous row and the lookup value corresponding to the output gray-scale value of the pixel in the current row are the output gray-scale values; if not, then,
and acquiring two end points of the gray scale partition where the output gray scale value of the pixel in the previous row of the pixel to be displayed is located and search values corresponding to the two end points of the gray scale partition where the output gray scale value of the pixel in the current row is located, and calculating the output gray scale value of the pixel to be displayed according to a linear interpolation method.
In one embodiment, each gray scale partition contains the same number of gray scales.
The invention respectively determines the gain value and the output gray level value of the image data in the areas at the two sides of the boundary line of the image data according to the position of each pixel, and adjusts the output gray level value by integrating the gain value, thereby driving the pixels to be displayed according to the adjustment result and maximally fading the boundary line at the separation position of the image data.
Drawings
FIG. 1 is a schematic diagram illustrating a partition manner at a boundary of an image of a display panel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an image processing method according to an embodiment of the present invention;
FIG. 3 is a gain table of a region on one side of a boundary according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a method for calculating a gain value of a pixel using a gain table;
FIG. 5 is a gray scale table of a region on one side of a boundary according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a method for calculating an output gray level value of a pixel using a gray level table.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, in the display panel of the present invention, during the display process, the image data is divided into two adjacent sub-display regions for display, for example, the image is divided into two left and right portions or two upper and lower portions from the middle boundary line C for scanning, and the description will be given by taking the example that the image data is divided into two upper and lower portions.
As shown in fig. 2, the image processing method of the display panel of the present embodiment mainly includes:
s01, taking a boundary C of two adjacent sub-display areas as a reference, and selecting a first side processing area A and a second side processing area B near the boundary C from the boundary C towards two different upper and lower sides respectively, wherein the lengths of the first side processing area A and the second side processing area B are consistent with the width of the effective display area, so as to ensure that the whole line of pixel areas at two sides of the boundary C are optimized;
s02, determining the position of the pixel x to be displayed in the first side processing area A or the second side processing area B, and obtaining a gain value gain _ x and an output gray-scale value gray _ x of the pixel x to be displayed according to the position of the pixel x to be displayed;
s03, calculating the product of the gain value gain _ x of the pixel to be displayed and the output gray-scale value gray _ x to obtain the actual gray-scale value G _ x of the pixel to be displayed, and writing the data voltage into the pixel to be displayed according to the actual gray-scale value G _ x.
Specifically, in step S02, the process of determining the position of the pixel x to be displayed in the first side processing area a or the second side processing area B mainly includes:
s021, dividing the first side processing area A and the second side processing area B into M rows and N columns of partitions respectively, wherein a boundary C is parallel to the row direction, and M, N is an integer not less than 2;
s022, determining the row and the column of the pixel x to be displayed in the first side processing area A or the second side processing area B.
The system stores a gain table of a first side processing area A and a gain table of a second side processing area B, the two gain tables record gain values corresponding to different positions in the processing areas, and the process of obtaining a gain value gain _ x of a pixel x to be displayed according to the position of the pixel x to be displayed mainly comprises the following steps:
s023, according to the number of rows and columns of the partition where the pixel x to be displayed is located, the gain table of the first-side processing area a or the gain table of the second-side processing area B is searched, and the gain value gain _ x of the pixel x to be displayed is obtained.
In this embodiment, the boundary line C divides the effective display area of the display panel into two vertically symmetrical portions, and the widths of the first side processing area a and the second side processing area B are the same. It is to be understood that the widths of the first side processing region a and the second side processing region B may be different, the number of sub display regions or boundaries is not limited in the present invention, and in other embodiments, the image data may be divided into two or more adjacent sub display regions to be displayed, and this image processing method is also applicable.
As a preferred implementation, the length/width of each partition of the present embodiment is an integer multiple of the length/width of a single pixel, i.e. a partition corresponds to exactly the size of one or more pixels. Preferably, the length/width of at least one partition is greater than the length/width of a single pixel, and the width/length of each partition may be the same or different.
In the present embodiment, at least one of the M, N is not greater than 8, for example, the first side processing area a and the second side processing area B are divided into 8 rows and 16 columns of partitions, respectively, that is, the area composed of the first side processing area a and the second side processing area B is divided into 16 × 16 partitions.
Preferably, in the partition having a length/width larger than that of a single pixel, the gain table of the first-side processing region and the gain table of the second-side processing region have gain values of respective regions linearly changing in the row direction and the column direction.
First sideThe gain table of the processing area a and the gain table of the second side processing area B are set in substantially the same manner, and as shown in fig. 3, the gain table of the first side processing area a and the gain table of the second side processing area B have the row partition line R of each partition recorded thereinmAnd row partition line CnGain value gain (R) at the intersection positionm，Cn) For example, in the table shown in FIG. 3, the horizontal direction corresponds to 17 column dividing lines C0～C16Longitudinally corresponding to 9 line-dividing lines R0～R8Row partition line C7And a row division line R2Gain value gain (R) of the intersection position of (2)2，C7) A, column division line C8And a row division line R2Gain value gain (R) of the intersection position of (2)2，C8) B, column section line C7And a row division line R3Gain value gain (R) of the intersection position of (2)3，C7) C, column section line C8And a row division line R3Gain value gain (R) of the intersection position of (2)3，C8)＝d。
Specifically, in step S023, the process of obtaining the gain value gain _ x of the pixel x to be displayed according to the position of the pixel x to be displayed specifically includes:
s0231, judging whether the pixel x to be displayed is on the line partition line RmAnd row partition line CnThe position of the intersection point;
s0232, if yes, then line partition line RmAnd row partition line CnThe gain value gain (R) corresponding to the intersection positionm，Cn) I.e. the gain value gain _ x of the pixel x to be displayed, e.g. the gain value gain (R) at the intersection of the column partition line C7 and the row partition line R2 in FIG. 32，C7) A, column division line C8And a row division line R2Gain value gain (R) of the intersection position of (2)2，C8) B, column section line C7And a row division line R3Gain value gain (R) of the intersection position of (2)3，C7) C, column section line C8And a row division line R3Gain value gain (R) of the intersection position of (2)3，C8) D; if not, then,
S0233. obtaining four different row partition lines R enclosing a pixel x to be displayed thereinmAnd row partition line CnAnd calculating the gain value gain _ x of the pixel x to be displayed according to the gain value corresponding to the intersection position and a linear interpolation method.
For example, as shown in FIG. 4, two adjacent row partition lines RmTwo adjacent column partition lines CnThe division in between corresponds to the size of a plurality of pixels, and here, it is assumed that the position of the pixel x to be displayed has been determined to be exactly on the column division line C of the first side processing area a or the second side processing area B7、C8And is located at the row partition line R2、R3In between, by looking up the gain table, obtain the column partition line C7、C8Respectively with the row partition line R2、R3Gain values a, b, C, d at four vertex positions of a bounding rectangle, and column partitioning line C7、C8The distance between the two lines is m, and the line partition line R2、R3The distance between the pixel x and the column partition line C is n7The distance between the pixel x and the line partition line R is j2The distance between the two pixels is k, wherein m, n, j and k are integral multiples of the corresponding side length of a single pixel.
Calculating to obtain the line R of the row and the column division where the pixel x to be displayed is positioned2Gain value of intersection position X1
The row and column partition line R of the pixel x to be displayed3Gain value of intersection position X2
Thus, the gain value of the pixel x to be displayed
Referring to fig. 5, in step S02, the process of obtaining the output gray-scale value gray _ x according to the position of the pixel x to be displayed specifically includes:
s024, acquiring output gray scale values of pixels in a row before a pixel x to be displayed and output gray scale values of pixels in a current row, searching a first gray scale table of a first side processing area or a second gray scale table of a second side processing area, and obtaining an output gray scale value gray _ x; the first gray scale table and the second gray scale table in the system record lookup values corresponding to output gray scale values of two adjacent rows of pixels, and the corresponding lookup values can be found in the corresponding gray scale tables according to the output gray scale values of the pixels in the previous row and the output gray scale values of the pixels in the current row, wherein the lookup values are the output gray scale values of the pixels x to be displayed.
The first gray scale table and the second gray scale table can be used for searching and determining the output gray scale value of the current pixel according to the output gray scale value of the previous line partition and the output gray scale value of the current line partition. In the first gray scale table and the second gray scale table, the output gray scale value of the previous row of pixels and the output gray scale value of the current row of pixels are used as the search nodes, and the output gray scale value range of the previous row of pixels and the output gray scale value range of the current row of pixels are divided into a plurality of gray scale partitions, at least one gray scale partition comprises a plurality of gray scale values, and the output gray scale values of the same row of pixels in the gray scale partition comprising the plurality of gray scale values can be considered to be linearly changed.
According to this setting, step S024 specifically includes:
s0241, judging whether the output gray-scale values of the pixels in the previous row of the pixel x to be displayed and the output gray-scale values of the pixels in the current row are both in the end points of the gray-scale subareas;
s0242, if yes, the output gray-scale value of the previous line of pixels and the lookup value corresponding to the output gray-scale value of the current line of pixels are the output gray-scale value gray _ x; if not, then,
s0243, obtaining the two end points of the gray scale partition where the output gray scale value of the previous row of pixels of the pixel x to be displayed is located, and the search values corresponding to the two end points of the gray scale partition where the output gray scale value of the current row of pixels is located, and calculating according to a linear interpolation method to obtain the output gray scale value gray _ x of the pixel x to be displayed.
In one embodiment, the number of gray levels contained in each gray level partition is preferably the same. For example, as shown in FIG. 5, in this embodimentThe output gray scale of the previous row of pixels and the output gray scale of the current row of pixels divide 255 gray scales into 8 gray scale partitions uniformly. For the pixels near the boundary line C, the pixels in the previous row of pixels and the pixels in the current row are searched in the corresponding first gray scale table or the second gray scale table according to the output gray scale values of the pixels in the previous row of pixels and the output gray scale values of the pixels in the current row, and the output gray scale values of the pixels in the current row are both one of the endpoints of the gray scale partition, for example, 32 and 64 respectively, and then the search value f can be directly obtained and is the output gray scale value gray _ x of the pixel x to be displayed. But when the output gray-scale values of the pixels of the previous row and the output gray-scale values of the pixels of the current row are not both one of the end points of the gray-scale division, it needs to be calculated by linear interpolation, specifically, as shown in fig. 6, it is assumed that the output gray-scale values of the pixels in the previous row of the pixel x to be displayed and the output gray-scale values of the pixels in the current row are x1 and x2, x1 is between the two adjacent gray-scale endpoint values Xa and Xb, x2 is between the two adjacent gray-scale endpoint values Ya and Yb, namely Xa < x1 < Xb, Ya < x2 < Yb, (the output gray level value of the pixel in the previous line, the output gray level value of the pixel in the current line) are (Xa, Ya), (Xb, Ya), (Xa, Yb), (Xb, Yb), the search values of the corresponding output gray-scale value gray _ x are e, f, g, and h, respectively, and then the output gray-scale value of the previous row of pixels is x1 and the output gray-scale value of the current row of pixels is Ya are obtained through calculation.
The output gray scale of the previous row of pixels is x1, and the output gray scale of the current row of pixels is Yb
Calculating to obtain the output gray scale value of the pixel x to be displayed
Therefore, the finally obtained actual gray-scale value G _ x of the pixel x to be displayed is gain _ x × gray _ x, and the pixel x to be displayed is driven by the corresponding data voltage according to the actual gray-scale value G _ x. After processing, the gray levels of the pixels near the boundary C can be naturally transited, so that the transition line between the image data on both sides is faded and is no longer easily perceived.
In summary, in the invention, in the areas on both sides of the boundary line of the image data, the gain value and the output gray level value of the image data are respectively determined according to the position of each pixel, and the output gray level value is adjusted by integrating the gain value, so that the pixels to be displayed are driven according to the adjustment result, the boundary line at the separation position of the image data can be faded to the maximum extent, and the display effect is optimized.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (9)
1. An image processing method of a display panel, wherein image data of the display panel is divided into at least two adjacent sub-display regions for display, the image processing method of the display panel comprises:
taking the boundary of two adjacent sub-display areas as a reference, and respectively selecting a first side processing area and a second side processing area from the boundary towards two different sides;
determining the position of a pixel (x) to be displayed in the first side processing area or the second side processing area, and obtaining a gain value (gain _ x) and an output gray-scale value (gray _ x) of the pixel (x) to be displayed according to the position of the pixel (x) to be displayed;
calculating the product of the gain value (gain _ x) of the pixel to be displayed and the output gray-scale value (gray _ x) to obtain the actual gray-scale value (G _ x) of the pixel to be displayed, and writing data voltage into the pixel to be displayed according to the actual gray-scale value (G _ x);
the determining the position of the pixel (x) to be displayed in the first side processing area or the second side processing area comprises: dividing the first side processing area and the second side processing area into M rows and N columns of partitions respectively, wherein the dividing line is parallel to the row direction, and M, N is an integer not less than 2;
the obtaining of the gain value (gain _ x) of the pixel (x) to be displayed according to the position of the pixel (x) to be displayed comprises: and searching a gain table of the first side processing area or a gain table of the second side processing area according to the row number and the column number of the partition where the pixel (x) to be displayed is located, and obtaining a gain value (gain _ x) of the pixel (x) to be displayed.
2. The image processing method of a display panel according to claim 1, wherein the length/width of each of the divisional regions is an integral multiple of the length/width of a single pixel.
3. The image processing method of a display panel according to claim 2, wherein a length/width of at least one of the partitions is larger than a length/width of a single pixel, and within the partition having a length/width larger than the length/width of a single pixel, gain values of respective regions in the gain table of the first-side processing region and the gain table of the second-side processing region are linearly changed in a row direction and a column direction.
4. The image processing method of a display panel according to claim 1, wherein at least one of M, N is not more than 8.
5. The image processing method of a display panel according to claim 3, wherein gain values at intersection positions of row partition lines and column partition lines of each partition are recorded in the gain table of the first-side processing region and the gain table of the second-side processing region;
the obtaining of the gain value (gain _ x) of the pixel (x) to be displayed according to the position of the pixel (x) to be displayed comprises:
judging whether the pixel (x) to be displayed is at the intersection point position of the row partition line and the column partition line;
if so, the gain value corresponding to the intersection point position of the row partition line and the column partition line is the gain value (gain _ x) of the pixel (x) to be displayed; if not, then,
and acquiring gain values corresponding to intersection points of four different row partition lines and column partition lines enclosing the pixel (x) to be displayed, and calculating the gain value (gain _ x) of the pixel (x) to be displayed according to a linear interpolation method.
6. The method according to any of claims 1-5, wherein said deriving an output gray-scale value (gray _ x) according to the position of the pixel (x) to be displayed comprises:
acquiring output gray-scale values of pixels in a row before the pixel (x) to be displayed and output gray-scale values of pixels in a current row, and searching a first gray-scale table of the first side processing area or a second gray-scale table of the second side processing area to obtain an output gray-scale value (gray _ x);
the first gray scale table and the second gray scale table record lookup values corresponding to output gray scale values of two adjacent rows of pixels, and the lookup values are the output gray scale values of the pixel (x) to be displayed.
7. The method as claimed in claim 6, wherein the first gray scale table and the second gray scale table each have an output gray scale value of a previous row of pixels and an output gray scale value of a current row of pixels as a lookup node, the range of the output gray scale values of the previous row of pixels and the range of the output gray scale values of the current row of pixels are divided into a plurality of gray scale partitions, at least one of the gray scale partitions comprises a plurality of gray scale values, and the output gray scale values of the same row of pixels vary linearly within the gray scale partition comprising the plurality of gray scale values.
8. The method according to claim 7, wherein the deriving an output gray-scale value (gray _ x) according to the position of the pixel (x) to be displayed further comprises:
judging whether the output gray-scale values of the pixels in the previous row of the pixels (x) to be displayed and the output gray-scale values of the pixels in the current row both fall at the end points of the gray-scale subareas;
if so, the lookup value corresponding to the output gray-scale value of the previous row of pixels and the output gray-scale value of the current row of pixels is the output gray-scale value (gray _ x); if not, then,
and acquiring two end points of the gray scale partition where the output gray scale value of the pixel in the previous row of the pixel (x) to be displayed is located and search values corresponding to two end points of the gray scale partition where the output gray scale value of the pixel in the current row is located, and calculating according to a linear interpolation method to obtain the output gray scale value (gray _ x) of the pixel (x) to be displayed.
9. The method as claimed in claim 7, wherein the gray scale number of each gray scale section is the same.
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