CN108133692B - Method and device for compensating and adjusting pixel data and liquid crystal display panel - Google Patents
Method and device for compensating and adjusting pixel data and liquid crystal display panel Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for compensating and adjusting pixel data, which comprises the following steps of 1, receiving pixel original gray scale data of a picture to be displayed; step 2, inquiring a first compensation table for each pixel original gray scale data to obtain a first gray scale value and a second gray scale value corresponding to each sub-pixel original gray scale data; step 3, inquiring a second compensation table to obtain a first adjustment value and a second adjustment value corresponding to the original gray scale data of each sub-pixel in the pixel; step 4, adjusting the first gray-scale value of each sub-pixel in the pixel by using the first adjusting value of the sub-pixel to obtain the adjusted first gray-scale value of the sub-pixel; adjusting the second gray scale value by the second adjusting value to obtain the adjusted second gray scale value of the sub-pixel; and 5, displaying the adjusted first gray-scale value and the second gray-scale value corresponding to each sub-pixel of each pixel. The invention also discloses a corresponding device and a liquid crystal display panel. By implementing the embodiment of the invention, the visual angle of the screen can be increased, the granular sensation of the pixel can be reduced, and the side-looking color effect can be improved.
Description
Technical Field
The present invention relates to the field of display, and in particular, to a method and an apparatus for performing compensation adjustment on pixel data, and a liquid crystal display panel.
Background
With the development of technology, the demand for large-sized liquid crystal display screens is increasing, and the sizes of the liquid crystal display screens which can be produced are also increasing, and for the large-sized liquid crystal display screens, the viewing angle parameters are particularly important.
Among the different types of liquid crystal display panels, the High Vertical Alignment (HVA) mode liquid crystal display panel has a significant disadvantage In viewing angle versus In-Plane Switching (IPS) mode liquid crystal display panel. Therefore, for the large-sized HVA type liquid crystal display panel, it is generally required to adopt a viewing angle compensation technique (VAC) to improve the brightness effect of the side view.
In an existing technology, the viewing angle compensation can be realized by adopting a main pixel area and a sub-pixel area for each sub-pixel of each pixel, namely, a higher gray scale is displayed in the main pixel area, and a lower gray scale is displayed in the sub-pixel area, so that the higher gray scale and the lower gray scale are pieced together, the pieced together of the higher gray scale and the lower gray scale in the front view is adaptive to the gray scale brightness effect of the original pixel, and meanwhile, in the side view, the higher gray scale can exert positive influence to improve the side view brightness effect.
As shown in fig. 1, a graph of a higher gray level and a lower gray level corresponding to a red sub-pixel (R) is shown. Therein, it can be seen that each of the original gray scale values corresponding to the R sub-pixels corresponds to a unique higher gray scale (R)H) And a lower gray level (R)L) (ii) a It will be appreciated that the other two sub-pixels also have similar higher and lower gray scale plots, i.e. corresponding to each original gray scale value of the green sub-pixel (G), which corresponds to a unique higher gray scale (G)H) And a lower gray level (G)L) (ii) a Corresponding to each original gray level value of the green sub-pixel (B), which corresponds to a unique higher gray level (B)H) And a lower gray level (B)L)。
In practical applications, in order to maximize the improvement of the side view effect, the difference between the higher gray level and the lower gray level corresponding to each sub-pixel is usually maximized. However, it brings about some disadvantages:
firstly, the matching of high and low gray scales can make the picture have larger granular sensation;
meanwhile, when the gray level difference corresponding to each sub-pixel in the original gray level values of some pixels is large, the image in the side view will appear a whitening phenomenon. The reasons for this are briefly described below:
as shown in fig. 2, a graph of relationship between gray level and intensity value of front view and side view of a red sub-pixel (R) before and after compensation by a viewing angle compensation technique is shown, wherein a line (1) represents a front view effect before compensation, a line (2) represents a side view effect before compensation, a line (3) represents a front view effect after compensation, and a line (4) represents a side view effect after compensation; it can be seen that the front viewing effect is substantially the same before and after compensation, and that the side viewing effect changes after compensation. Similar changes occur in the other two color sub-pixels, i.e., the green sub-pixel (G) and the blue sub-pixel (B). Fig. 3 shows a schematic side view of three sub-pixels after compensation. Wherein line (4) represents the side-viewing effect of the red sub-pixel, line (5) represents the side-viewing effect of the green sub-pixel, and line (6) represents the side-viewing effect of the blue sub-pixel.
In conjunction with fig. 2 and fig. 3, we can fit a graph of the relationship between the gray level and the intensity value of the front and the side view compensated by the viewing angle compensation technique, as shown in fig. 4, and it can be understood that since the relationship between the front and the side view of the RGB sub-pixels is substantially the same, the R, G, B sub-pixels are not distinguished in fig. 4. From this, it can be seen that the side view curves ("Off-axis" in the figure) deviate from the front view curves ("On-axis" in the figure). When the difference of the gray scale values among R, G, B sub-pixels in the original pixel is small, the size proportion relation of the RGB gray scale obtained from the side view is close to the front view; however, if the gray level difference of R, G, B in the original pixel is large, the RGB gray level scaling system obtained for the side view will change greatly, and the color effect displayed in the side view will deviate. As shown in fig. 5, a front view color effect diagram and a side view color effect diagram compensated by the viewing angle compensation technique are shown, for example, for the original pixels (220, 150, 100), the viewing angle compensation technique is compensated, and as can be seen from fig. 2, the pixel effect displayed in the side view is equivalent to the pixel (215, 192, 176) corresponding to the same light intensity, which causes the color whitening phenomenon.
Disclosure of Invention
The present invention provides a method and an apparatus for performing compensation adjustment on pixel data, and a liquid crystal display panel, which can increase the viewing angle of a screen, reduce the granular sensation of pixels, and improve the color effect of side view.
In order to solve the above technical problem, an aspect of the embodiments of the present invention provides a method for performing compensation adjustment on pixel data, which at least includes the following steps:
and 5, displaying the adjusted first gray-scale value and the second gray-scale value corresponding to each sub-pixel of each pixel.
Wherein, the step 5 specifically comprises the following steps:
for each sub-pixel in the pixel, subtracting the first gray-scale value of the sub-pixel from the first adjustment value of the sub-pixel to obtain an adjusted first gray-scale value of the sub-pixel; and adding the second gray scale value to the second adjustment value to obtain the adjusted second gray scale value.
Wherein, further comprising the step of obtaining the second compensation table in advance, comprising:
according to the size relation of the gray-scale values of three sub-pixels in the pixel, six index relations are planned under six conditions that two sub-pixels are the same and are different from the third sub-pixel;
for each index relationship, selecting an original pixel gray-scale value which accords with the index relationship, inputting each group of original gray-scale data with the difference value corresponding to 0-256 into the liquid crystal display panel by taking the maximum difference value of each sub-pixel gray-scale value in the original pixel gray-scale value as a basis, debugging each group of original gray-scale data to enable the side-view and front-view display effects to be close, and obtaining a first adjusting value and a second adjusting value corresponding to each sub-pixel in each group of original gray-scale data;
determining two kinds of index relations which are closest to the original pixel gray-scale value which does not accord with the index relation according to the size relation of each sub-pixel, obtaining a first adjusting value and a second adjusting value which correspond to corresponding difference values in the two kinds of index relations, and carrying out interpolation calculation according to the two groups of first adjusting values and second adjusting values to obtain a first adjusting value and a second adjusting value which correspond to the pixel;
and forming a second compensation table according to the first adjustment value and the second adjustment value corresponding to all the pixels which accord with the six index relationships and the first adjustment value and the second adjustment value corresponding to all the pixels which do not accord with the six index relationships.
Accordingly, another aspect of the embodiments of the present invention further includes an apparatus for performing compensation adjustment on pixel data, which is implemented in a timing controller of a display panel, and includes:
the pixel original gray scale data receiving unit is used for receiving pixel original gray scale data of a picture to be displayed;
the first compensation table query unit is used for querying a first compensation table for each pixel original gray scale data to obtain a first gray scale value and a second gray scale value corresponding to each sub-pixel original gray scale data in the pixel, wherein the first gray scale value is larger than the original gray scale data of the sub-pixel, and the second gray scale value is smaller than the original gray scale data of the sub-pixel;
a second compensation table query unit, configured to query a second compensation table according to the pixel original gray-scale data, to obtain a first adjustment value and a second adjustment value corresponding to each sub-pixel original gray-scale data in the pixel, where the first adjustment value and the second adjustment value are associated with a maximum difference value of each sub-pixel in the pixel original gray-scale data;
the compensation calculation unit is used for adjusting the first gray-scale value by using a first adjustment value of each sub-pixel in the pixel to obtain an adjusted first gray-scale value of the sub-pixel; adjusting the second gray scale value by using a second adjustment value of the first gray scale value to obtain an adjusted second gray scale value of the sub-pixel;
and the adjusted pixel data sending unit is used for sending the adjusted first gray-scale value and the adjusted second gray-scale value corresponding to each sub-pixel of each pixel to the display panel for displaying.
Wherein the compensation calculation unit includes:
the first gray-scale value calculation unit is used for subtracting the first adjustment value from the first gray-scale value of each sub-pixel in the pixel to obtain the adjusted first gray-scale value;
and the second gray-scale value calculating unit is used for adding the second gray-scale value of each sub-pixel in the pixel to the second adjusting value of the sub-pixel to obtain the adjusted second gray-scale value of the sub-pixel.
Wherein, the device further comprises a storage unit for storing the first compensation table and the second compensation table.
Wherein, further include: a second compensation table generating unit, the second compensation table generating unit further comprising:
the index relation dividing unit is used for planning six index relations according to the size relation of the gray-scale values of three sub-pixels in the pixel, wherein two sub-pixels are the same and different from the third sub-pixel;
an index relation adjustment value obtaining unit, configured to select, for each index relation, an original pixel gray-scale value that meets the index relation, input each set of original gray-scale data, in which the difference corresponds to 0 to 256, into the liquid crystal display panel based on a maximum difference of each sub-pixel gray-scale value in the original pixel gray-scale value, debug each set of original gray-scale data, so that a side-view display effect and a front-view display effect of each set of original gray-scale data are close to each other, and obtain a first adjustment value and a second adjustment value that correspond to each sub-pixel in each set of original gray-scale data;
the other adjustment value obtaining unit is used for determining two closest index relationships of the original pixel gray-scale value which does not conform to the index relationship according to the size relationship of each sub-pixel, obtaining a first adjustment value and a second adjustment value which correspond to corresponding difference values in the two index relationships, and carrying out interpolation calculation according to the two groups of first adjustment values and second adjustment values to obtain a first adjustment value and a second adjustment value which correspond to the pixel;
and the second compensation table synthesis unit is used for forming a second compensation table according to the first adjustment value and the second adjustment value corresponding to all the pixels which accord with the six index relationships and the first adjustment value and the second adjustment value corresponding to all the pixels which do not accord with the six index relationships.
Accordingly, in another aspect, an embodiment of the present invention further provides a liquid crystal display panel, where the display panel includes a timing processor; the sequential processor at least comprises the device for compensating and adjusting the pixel data.
The embodiment of the invention has the following beneficial effects:
first, in the embodiment of the present invention, it adds the attenuation data (the first adjustment value and the second adjustment value in the second compensation table) with the magnitude relation between R, G, B sub-pixels as a variable on the basis of the first compensation table (i.e. HL table) of R, G, B sub-pixels with the largest pull-apart sub-pixels to properly reduce the difference between the higher gray level and the lower gray level of each pixel, so that the graininess can be reduced and the viewing angle can be further improved;
secondly, the proportional relationship between the sub-pixels of the pixel in the side view and the proportional relationship between the sub-pixels in the front view can be closer by adjusting the gray scale difference between the higher gray scale and the lower gray scale of each sub-pixel through the second compensation table, so that the color displayed in the side view is closer to the color displayed in the front view, and the phenomenon of whitening can be reduced;
in addition, due to the adoption of the forms of the first compensation table and the second compensation table, for the liquid crystal display panels with the same size or batch, the completely same first compensation table can be adopted, and only the corresponding second compensation table needs to be obtained for each liquid crystal display panel, so that the pixel compensation mode is more flexible, and the adaptability of the method is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph showing a higher gray level and a lower gray level corresponding to a conventional red sub-pixel (R);
FIG. 2 is a graph showing gray scale values versus intensity values for front and side views compensated by a conventional viewing angle compensation technique;
FIG. 3 is a graph showing gray scale values versus intensity values for front and side views of a red sub-pixel (R) before and after compensation by a viewing angle compensation technique;
FIG. 4 is a graph of gray scale values versus intensity values for the compensated side view corresponding to the three subpixels of FIG. 3;
FIG. 5 is a diagram illustrating front and side color effects compensated by a viewing angle compensation technique;
fig. 6 is a schematic diagram illustrating a principle involved in a method for performing compensation adjustment on pixel data according to the present invention;
FIG. 7 is a schematic flow chart illustrating an embodiment of a method for performing compensation adjustment on pixel data according to the present invention;
FIG. 8 is a graph showing the relationship between the gray scale values of the three sub-pixels involved in FIG. 7;
fig. 9 is a schematic structural diagram illustrating an embodiment of an apparatus for performing compensation adjustment on pixel data according to the present invention;
FIG. 10 is a schematic structural diagram of a second compensation table generating unit in FIG. 9;
FIG. 11 is a schematic diagram of the compensation calculating unit in FIG. 6;
fig. 12 is a schematic structural diagram of a liquid crystal display panel according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
Based on the defects in the prior art, the inventor considers that the curve relationship between the gray scale and the intensity can be changed by adjusting the gray scale value of each sub-pixel in the pixel, so that the proportional relationship between the sub-pixels of each pixel in the side view is closer to the proportional relationship between the sub-pixels in the front view, the color displayed in the side view is closer to the color displayed in the front view, and the phenomenon of whitening can be reduced. As shown in fig. 6, a schematic diagram is shown, from which it can be seen that the side-looking effect (i.e. thick dotted line) of the whole pixel can be changed to restore the skin color by changing a part of the line (4) (see the R Δ part dotted line) and changing the line (5) to represent a part of the green color (see the G Δ part dotted line), which is proportional to the RGB relationship in the front-looking skin color. Fig. 7 is a main flow chart of an embodiment of a method for performing compensation adjustment on pixel data according to the present invention, where the method at least includes the following steps:
step S10, receiving pixel original gray scale data of a picture to be displayed;
step S11, for each pixel original gray scale data, querying a first compensation table to obtain a first gray scale value and a second gray scale value corresponding to each sub-pixel original gray scale data in the pixel, where the first gray scale value is greater than the original gray scale data of the sub-pixel, and the second gray scale value is less than the original gray scale data of the sub-pixel, and more specifically, in one example, the first gray scale value is a higher gray scale of the sub-pixel, and the second gray scale value is a lower gray scale of the sub-pixel, where the higher gray scale and the lower gray scale have a larger difference as much as possible;
step S12, according to the pixel original gray scale data, querying a second compensation table to obtain a first adjustment value and a second adjustment value corresponding to each sub-pixel original gray scale data in the pixel, where the first adjustment value and the second adjustment value are associated with a maximum difference value of each sub-pixel in the pixel original gray scale data;
step S13, adjusting the first gray-scale value by the first adjustment value of each sub-pixel in the pixel to obtain an adjusted first gray-scale value of the sub-pixel; adjusting the second gray scale value by using a second adjustment value of the first gray scale value to obtain an adjusted second gray scale value of the sub-pixel;
step S14, displaying the adjusted first and second gray scale values corresponding to the sub-pixels of each pixel.
Wherein, further comprising the step of obtaining the second compensation table in advance, the step comprises:
step S20, according to the relationship of the gray-scale values of three sub-pixels in the pixel, six conditions that two sub-pixels are the same and different from the third sub-pixel are planned to form six index relationships;
as shown in fig. 8, three kinds of relationship diagrams of gray scale values of the sub-pixels are shown. Wherein, the closer to a certain vertex, the larger the gray-scale value of the sub-pixel marked by the vertex is, and the smaller the gray-scale values of the other two sub-pixels are; for example, for vertex G, indicating that the closer to the vertex, the larger the gray scale value of subpixel G, the smaller the gray scale values of subpixels B and R; at the point O, the gray scale values corresponding to the three sub-pixels RGB are equal, and may be specifically 0 to 255. It can be seen that fig. 8 represents the correspondence of the gray-scale values of the three sub-pixels, not the specific gray-scale values. Six indexing relationships can be defined from the O point issue. Specifically, a line segment 1 represents R ═ G > B (indicated by the number 1 marked in a circle in the figure), and a point on this line segment represents that all the sub-pixel gray-scale values conform to the R ═ G > B relationship pixel set; similarly, line 2 represents G > B ═ R, line 3 represents G ═ B > R, line 4 represents B ═ G ═ R, line 5 represents B ═ R > G, and line 6 represents R ═ B ═ G;
step S21, for each index relationship, selecting an original pixel gray-scale value which accords with the index relationship, inputting each group of original gray-scale data with the difference value corresponding to 0-256 into the liquid crystal display panel by taking the maximum difference value of each sub-pixel gray-scale value in the original pixel gray-scale value as a basis, debugging each group of original gray-scale data to enable the display effect of the side view and the front view of each group of original gray-scale data to be close, and obtaining a first adjusting value and a second adjusting value which correspond to each sub-pixel in each group of original gray-scale data;
specifically, for example, for a pixel point set in segment 1, where the gray scale difference is R-B or G-B (because R ═ G on segment 1), through debugging, an index table of adjustment values corresponding to each gray scale difference corresponding to segment 1 can be obtained, as shown in table one below, where Δ rh is a first adjustment value corresponding to a red subpixel for adjusting the higher gray scale thereof; and delta rl is a second adjustment value corresponding to the green sub-pixel and is used for adjusting the lower gray scale of the green sub-pixel. Similarly, Δ gh and Δ gl are the first adjustment value and the second adjustment value corresponding to the green sub-pixel, respectively; Δ bh and Δ bl are the first adjustment value and the second adjustment value corresponding to the blue sub-pixel, respectively.
Index table for adjusting value corresponding to each gray scale difference corresponding to a line segment 1
Similarly, an index table of adjustment values corresponding to gray scale differences of the line segments 2 to 6 can be obtained.
It can be understood that, in a specific implementation, as for the difference values 0 to 255, only a plurality of groups of difference values may be selected for debugging processing, so as to obtain corresponding first adjustment values and second adjustment values; other groups may be obtained by means of interpolation calculations.
Step S22, determining two closest index relations according to the size relation of each sub-pixel for the gray-scale value of the original pixel not conforming to the index relation, obtaining a first adjustment value and a second adjustment value corresponding to the corresponding difference value in the two index relations, and performing interpolation calculation according to the two groups of first adjustment values and second adjustment values to obtain a first adjustment value and a second adjustment value corresponding to the pixel;
specifically, in fig. 8, the area between two adjacent line segments can be used to characterize other original pixel gray-scale value relationships that do not conform to the index relationship. In one embodiment, the difference between segment 1 and segment 6 is defined as region a, which is used to indicate that R > -G > B; a region B between segment 1 and segment 2 for indicating that G > R > ═ B; region c is used to indicate G > -B > R; d is used to indicate B > G > -R; the e region is used for representing B > -R > G; the f region is used to indicate R > B > -G.
For example, for a pixel (220, 150, 100), the maximum difference of its sub-pixels is 120; firstly, judging that the line is in an area a, and respectively setting two corresponding adjacent line segments as a line segment 1 and a line segment 6; obtaining values of Δ rh, Δ rl, Δ gh, Δ gl, Δ bh and Δ bl corresponding to the maximum difference value of 120 from the line segment 1; obtaining values of delta rh, delta rl, delta gh, delta gl, delta bh and delta bl corresponding to the maximum difference value of 120 from the line segment 6; and finally obtaining values of delta rh, delta rl, delta gh, delta gl, delta bh and delta bl corresponding to the pixel points (220, 150 and 100) by carrying out interpolation operation on the two groups of data. Therefore, adjustment value data corresponding to all original pixel gray-scale values which do not accord with the index relation can be obtained;
step S24, forming a second compensation table according to the first adjustment value and the second adjustment value corresponding to all pixels that conform to the six index relationships, and the first adjustment value and the second adjustment value corresponding to all pixels that do not conform to the six index relationships;
specifically, in one embodiment, the second compensation table may be in the form described below;
TABLE 2 second Compensation watch
Wherein, the step 5 specifically comprises the following steps:
for each sub-pixel in the pixel, subtracting the first gray-scale value of the sub-pixel from the first adjustment value of the sub-pixel to obtain an adjusted first gray-scale value of the sub-pixel; and adding the second gray scale value to the second adjustment value to obtain the adjusted second gray scale value.
Specifically, the adjusted higher gray level corresponding to the red sub-pixel is: rHΔ rh, lower gray scale: rL+. DELTA rl; the higher gray levels for the green sub-pixel are: gHΔ gh, lower gray levels: gL+. Δ gl; the higher gray levels for the blue sub-pixel are: b isHΔ bh, lower gray levels: b isL+△bl。
It is understood that, in the embodiment of the present invention, it is possible to reduce the graininess and further improve the viewing angle by adding the reduction data (the first adjustment value and the second adjustment value in the second compensation table) with the magnitude relation between R, G, B sub-pixels as a variable on the basis of the first compensation table (i.e., HL table) of R, G, B sub-pixels with the greatest pull-apart, so as to appropriately reduce the difference between the higher gray level and the lower gray level of each pixel. Meanwhile, the proportional relation between the sub-pixels of the pixel in the side view and the proportional relation between the sub-pixels in the front view can be closer by adjusting the gray scale difference between the higher gray scale and the lower gray scale of each sub-pixel through the second compensation table, so that the color displayed in the side view is closer to the color displayed in the front view, and the phenomenon of whitening can be reduced.
Fig. 9 is a schematic structural diagram illustrating an embodiment of an apparatus for performing compensation adjustment on pixel data according to the present invention. As shown in fig. 10 to 12 together, in this embodiment, the apparatus is provided in a timing controller of a display panel, and the apparatus 1 includes:
a pixel original gray scale data receiving unit 10, configured to receive pixel original gray scale data of a picture to be displayed;
a first compensation table query unit 11, configured to query a first compensation table for each pixel original gray-scale data, to obtain a first gray-scale value and a second gray-scale value corresponding to each sub-pixel original gray-scale data in the pixel, where the first gray-scale value is greater than the sub-pixel original gray-scale data, and the second gray-scale value is smaller than the sub-pixel original gray-scale data;
a second compensation table query unit 12, configured to query a second compensation table according to the pixel original gray-scale data, to obtain a first adjustment value and a second adjustment value corresponding to each sub-pixel original gray-scale data in the pixel, where the first adjustment value and the second adjustment value are associated with a maximum difference value of each sub-pixel in the pixel original gray-scale data;
a compensation calculating unit 13, configured to adjust the first gray-scale value by using a first adjustment value of each sub-pixel in the pixel, so as to obtain an adjusted first gray-scale value of the sub-pixel; adjusting the second gray scale value by using a second adjustment value of the first gray scale value to obtain an adjusted second gray scale value of the sub-pixel;
an adjusted pixel data sending unit 14, configured to send the adjusted first gray scale value and the adjusted second gray scale value corresponding to each sub-pixel of each pixel to a display panel for displaying;
a second compensation table generating unit 16 for generating a second compensation table;
a storage unit 15, configured to store the first compensation table and the second compensation table.
Wherein the second compensation table generating unit 16 further includes:
an index relation dividing unit 160, configured to plan six kinds of index relations according to the magnitude relation of the gray-scale values of three sub-pixels in the pixel, where two sub-pixels are the same and different from the third sub-pixel;
an index relation adjustment value obtaining unit 161, configured to select, for each index relation, an original pixel gray-scale value that meets the index relation, input each set of original gray-scale data, where the difference corresponds to 0 to 256, into the liquid crystal display panel according to a maximum difference between sub-pixel gray-scale values in the original pixel gray-scale value, debug each set of original gray-scale data, so that a side-view display effect is close to a front-view display effect, and obtain a first adjustment value and a second adjustment value that correspond to each sub-pixel in each set of original gray-scale data;
the other adjustment value obtaining unit 162 is configured to determine, according to a size relationship of each sub-pixel, two closest index relationships for an original pixel gray-scale value that does not conform to the index relationship, obtain a first adjustment value and a second adjustment value corresponding to a corresponding difference in the two index relationships, and perform interpolation calculation according to the two sets of first adjustment values and second adjustment values to obtain a first adjustment value and a second adjustment value corresponding to the pixel;
the second compensation table synthesizing unit 163 is configured to form a second compensation table according to the first adjustment value and the second adjustment value corresponding to all pixels that meet the six kinds of index relationships, and the first adjustment value and the second adjustment value corresponding to all pixels that do not meet the six kinds of index relationships.
Wherein the compensation calculation 13 unit comprises:
a first gray-scale value calculating unit 130, configured to subtract, from each sub-pixel in the pixel, a first adjustment value of the sub-pixel to obtain an adjusted first gray-scale value;
the second gray-scale value calculating unit 131 is configured to add the second gray-scale value to the second adjustment value of each sub-pixel in the pixel to obtain an adjusted second gray-scale value.
It is understood that, for more details of the apparatus 1 for performing compensation adjustment on pixel data, reference may be made to the foregoing description of fig. 7 to 8, and details are not repeated here.
It is understood that in another aspect of the present invention, a liquid crystal display panel is also provided. As shown in fig. 12, a schematic diagram of a display panel provided by the present invention is shown. Wherein, the liquid crystal display panel 2 at least comprises a time sequence processor 3; at least the device 1 for compensation adjustment of pixel data described above is included in the timing processor 3. It is understood that other components, such as an array substrate, a color filter, a liquid crystal layer disposed between the array substrate and the color filter, and the like, exist in the liquid crystal display panel, and are not described in detail herein. Accordingly, reference may be made to the preceding description of fig. 7-11 for more details of the apparatus 1 for compensation adjustment of pixel data.
The embodiment of the invention has the following beneficial effects:
first, in the embodiment of the present invention, it adds the attenuation data (the first adjustment value and the second adjustment value in the second compensation table) with the magnitude relation between R, G, B sub-pixels as a variable on the basis of the first compensation table (i.e. HL table) of R, G, B sub-pixels with the largest pull-apart sub-pixels to properly reduce the difference between the higher gray level and the lower gray level of each pixel, so that the graininess can be reduced and the viewing angle can be further improved;
secondly, the proportional relationship between the sub-pixels of the pixel in the side view and the proportional relationship between the sub-pixels in the front view can be closer by adjusting the gray scale difference between the higher gray scale and the lower gray scale of each sub-pixel through the second compensation table, so that the color displayed in the side view is closer to the color displayed in the front view, and the phenomenon of whitening can be reduced;
in addition, due to the adoption of the forms of the first compensation table and the second compensation table, for the liquid crystal display panels with the same size or batch, the completely same first compensation table can be adopted, and only the corresponding second compensation table needs to be obtained for each liquid crystal display panel, so that the pixel compensation mode is more flexible, and the adaptability of the method is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
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 (8)
1. A method for performing compensation adjustment on pixel data, comprising:
step 1, receiving pixel original gray scale data of a picture to be displayed;
step 2, inquiring a first compensation table for the original gray scale data of each pixel to obtain a first gray scale value and a second gray scale value corresponding to the original gray scale data of each sub-pixel in the pixel, wherein the first gray scale value is larger than the original gray scale data of the sub-pixel, and the second gray scale value is smaller than the original gray scale data of the sub-pixel;
step 3, inquiring a second compensation table according to the pixel original gray scale data to obtain a first adjustment value and a second adjustment value corresponding to each sub-pixel original gray scale data in the pixel, wherein the first adjustment value and the second adjustment value are associated with the maximum difference value of each sub-pixel in the pixel original gray scale data;
step 4, adjusting the first gray-scale value by the first adjusting value of each sub-pixel in the pixel to obtain the adjusted first gray-scale value of the sub-pixel; adjusting the second gray scale value by using a second adjustment value of the first gray scale value to obtain an adjusted second gray scale value of the sub-pixel;
step 5, displaying the adjusted first gray scale value and the second gray scale value corresponding to each sub-pixel of each pixel;
further comprising the step of pre-obtaining the second compensation table, comprising:
planning an index relation according to the size relation of the gray-scale values of three sub-pixels in the pixel; respectively obtaining a first adjusting value and a second adjusting value corresponding to each sub-pixel in each group of original gray scale data for each index relation and the gray scale value of the original pixel which does not conform to the index relation; and forming a second compensation table according to the first adjustment value and the second adjustment value.
2. The method according to claim 1, characterized in that in said step 5 in particular:
for each sub-pixel in the pixel, subtracting the first gray-scale value of the sub-pixel from the first adjustment value of the sub-pixel to obtain an adjusted first gray-scale value of the sub-pixel; and adding the second gray scale value to the second adjustment value to obtain the adjusted second gray scale value.
3. The method according to claim 2, wherein the step of obtaining the second compensation table in advance specifically includes:
according to the size relation of the gray-scale values of three sub-pixels in the pixel, six index relations are planned under six conditions that two sub-pixels are the same and are different from the third sub-pixel;
for each index relationship, selecting an original pixel gray-scale value which accords with the index relationship, inputting each group of original gray-scale data with the difference value corresponding to 0-256 into a liquid crystal display panel by taking the maximum difference value of each sub-pixel gray-scale value in the original pixel gray-scale value as a basis, debugging each group of original gray-scale data to enable the side-view and front-view display effects to be close to each other, and obtaining a first adjusting value and a second adjusting value corresponding to each sub-pixel in each group of original gray-scale data;
determining two kinds of index relations which are closest to the original pixel gray-scale value which does not accord with the index relation according to the size relation of each sub-pixel, obtaining a first adjusting value and a second adjusting value which correspond to the corresponding maximum difference value in the two kinds of index relations, and carrying out interpolation calculation according to the two groups of first adjusting values and second adjusting values to obtain a first adjusting value and a second adjusting value which correspond to the pixel;
and forming a second compensation table according to the first adjustment value and the second adjustment value corresponding to all the pixels which accord with the six index relationships and the first adjustment value and the second adjustment value corresponding to all the pixels which do not accord with the six index relationships.
4. An apparatus for performing compensation adjustment of pixel data, which is implemented in a timing controller of a liquid crystal display panel, comprising:
the pixel original gray scale data receiving unit is used for receiving pixel original gray scale data of a picture to be displayed;
the first compensation table query unit is used for querying a first compensation table for each pixel original gray scale data to obtain a first gray scale value and a second gray scale value corresponding to each sub-pixel original gray scale data in the pixel, wherein the first gray scale value is larger than the original gray scale data of the sub-pixel, and the second gray scale value is smaller than the original gray scale data of the sub-pixel;
a second compensation table query unit, configured to query a second compensation table according to the pixel original gray-scale data, to obtain a first adjustment value and a second adjustment value corresponding to each sub-pixel original gray-scale data in the pixel, where the first adjustment value and the second adjustment value are associated with a maximum difference value of each sub-pixel in the pixel original gray-scale data;
the compensation calculation unit is used for adjusting the first gray-scale value by using a first adjustment value of each sub-pixel in the pixel to obtain an adjusted first gray-scale value of the sub-pixel; adjusting the second gray scale value by using a second adjustment value of the first gray scale value to obtain an adjusted second gray scale value of the sub-pixel;
the adjusted pixel data sending unit is used for sending the adjusted first gray-scale value and the adjusted second gray-scale value corresponding to each sub-pixel of each pixel to the liquid crystal display panel for displaying;
further comprising:
the second compensation table generating unit is used for planning an index relation according to the size relation of the gray-scale values of the three sub-pixels in the pixel; respectively obtaining a first adjusting value and a second adjusting value corresponding to each sub-pixel in each group of original gray scale data for each index relation and the gray scale value of the original pixel which does not conform to the index relation; and forming a second compensation table according to the first adjustment value and the second adjustment value.
5. The apparatus of claim 4, wherein the compensation calculation unit comprises:
the first gray-scale value calculation unit is used for subtracting the first adjustment value from the first gray-scale value of each sub-pixel in the pixel to obtain the adjusted first gray-scale value;
and the second gray-scale value calculating unit is used for adding the second gray-scale value of each sub-pixel in the pixel to the second adjusting value of the sub-pixel to obtain the adjusted second gray-scale value of the sub-pixel.
6. The apparatus of claim 5, further comprising a storage unit to store the first compensation table and the second compensation table.
7. The apparatus of claim 6, wherein the second compensation table generation unit further comprises:
the index relation dividing unit is used for planning six index relations according to the size relation of the gray-scale values of three sub-pixels in the pixel, wherein two sub-pixels are the same and different from the third sub-pixel;
an index relation adjustment value obtaining unit, configured to select, for each index relation, an original pixel gray-scale value that meets the index relation, input each set of original gray-scale data, in which the difference corresponds to 0 to 256, into the liquid crystal display panel based on a maximum difference of each sub-pixel gray-scale value in the original pixel gray-scale value, debug each set of original gray-scale data, so that a side-view display effect and a front-view display effect of each set of original gray-scale data are close to each other, and obtain a first adjustment value and a second adjustment value that correspond to each sub-pixel in each set of original gray-scale data;
the other adjustment value obtaining unit is used for determining two closest index relationships of the original pixel gray-scale value which does not conform to the index relationship according to the size relationship of each sub-pixel, obtaining a first adjustment value and a second adjustment value which correspond to the corresponding maximum difference value in the two index relationships, and carrying out interpolation calculation according to the two groups of the first adjustment value and the second adjustment value to obtain the first adjustment value and the second adjustment value which correspond to the pixel;
and the second compensation table synthesis unit is used for forming a second compensation table according to the first adjustment value and the second adjustment value corresponding to all the pixels which accord with the six index relationships and the first adjustment value and the second adjustment value corresponding to all the pixels which do not accord with the six index relationships.
8. A liquid crystal display panel comprises a time sequence processor; -means for compensation adjustment of pixel data according to any of claims 4 to 7, wherein at least said means are included in said sequential processor.
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