CN111489711B - Method and device for improving low color cast of visual angle by using algorithm and display panel - Google Patents
Method and device for improving low color cast of visual angle by using algorithm and display panel Download PDFInfo
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Abstract
The invention discloses a method, a device and a display panel for improving low color cast of a visual angle by utilizing an algorithm, wherein the method comprises the following steps: acquiring sub-pixels of a picture pixel to be displayed; distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set; and obtaining the H value and the L value of the sub-pixel according to the corresponding point set. The method of the embodiment of the invention does not increase the memory as much as possible, and considers the color cast of all colors of the visual angles, so that the visual angles reach the full color level optimization, and the optimal color cast state is shown on the optical representation.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a method and a device for improving low color cast of a visual angle by using an algorithm, and a display panel.
Background
With the development of Display technology, Liquid Crystal Displays (LCDs) have advantages of light weight, thinness, and low radiation, and are gradually replacing Cathode Ray Tube (CRT) Display devices, and becoming the most common Display devices in information terminals such as computers, smart phones, mobile phones, car navigation devices, and electronic books.
As the display specification of the lcd is continuously developing towards large size, the market demands the lcd performance to pay more and more attention to the characteristics of high contrast, fast response, wide viewing angle, etc. In order to overcome the viewing angle problem of large-sized liquid crystal display panels, the wide viewing angle technology of liquid crystal display panels must be continuously improved and broken through. Vertically Aligned liquid crystal (PSVA, Polmer Stabilized vertical Aligned) is one of the wide viewing angle technologies currently widely used in liquid crystal display panels.
However, the VA liquid crystal display panel has a structure that is likely to cause color washout (color washout) at a large viewing angle as the viewing angle is adjusted. Referring to fig. 1a to 1c and fig. 2, for 4domain VA, there is a problem of wash out at a large viewing angle, and if the viewing angle is changed to 45 ° or 60 °, the display will be shifted to white.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a method, an apparatus and a display panel for improving low color shift of viewing angle by using an algorithm. The technical problem to be solved by the invention is realized by the following technical scheme:
the embodiment of the invention provides a method for improving low color cast of a visual angle by utilizing an algorithm, which comprises the following steps:
acquiring sub-pixels of a picture pixel to be displayed;
distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
and obtaining the H value and the L value of the sub-pixel according to the corresponding point set.
In a specific embodiment, distributing the sub-pixels in a three-dimensional space according to a preset manner to obtain a corresponding point set, includes:
and distributing the sub-pixels in a three-dimensional space according to a first preset mode to obtain a corresponding point set.
In a specific embodiment, distributing the sub-pixels in a three-dimensional space according to a preset manner to obtain a corresponding point set, includes:
and distributing the sub-pixels in a three-dimensional space according to a second preset mode to obtain a corresponding point set.
In a specific embodiment, obtaining the H value and the L value of the sub-pixel according to the corresponding point set includes:
acquiring an H value and an L value of the corresponding point set according to an HL table, wherein the corresponding point set comprises a plurality of corresponding points;
and obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point.
In a specific embodiment, deriving the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point includes:
calculating the average value of the H values and the average value of the L values of all the corresponding points by using a preset method;
and obtaining the H value and the L value of the sub-pixel according to the average value of the H values and the average value of the L values of all the corresponding points.
An embodiment of the present invention further includes an apparatus for improving low color shift of viewing angle by using an algorithm, which is implemented in a timing processor of a display panel, including:
the device comprises an acquisition unit, a display unit and a display unit, wherein the acquisition unit is used for acquiring sub-pixels of a picture pixel to be displayed;
the corresponding point set conversion unit is used for distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
and the calculating unit is used for obtaining the H value and the L value of the sub-pixel according to the corresponding point set.
An embodiment of the present invention further includes a display panel, wherein the display panel includes a timing controller, and the timing processor includes the apparatus for improving low color shift of viewing angle by using the algorithm described in the above embodiments.
Compared with the prior art, the invention has the beneficial effects that:
in the embodiment of the invention, the sub-pixels are distributed in the three-dimensional space, and then the corresponding point sets are correspondingly obtained, so that the H value and the L value of the sub-pixels are obtained. The method of the embodiment of the invention does not increase the memory as much as possible, and considers the color cast of all colors of the visual angles, so that the visual angles reach the full color level optimization, and the optimal color cast state is shown on the optical representation.
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FIGS. 1a to 1c are schematic diagrams of color cast phenomena of pictures at different viewing angles according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a relationship between gray scale values and gamma values at different viewing angles according to the present invention;
FIG. 3 is a schematic flow chart illustrating a method for improving low color shift of a viewing angle by an algorithm according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first three-dimensional space according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating gray-scale values of sub-pixels corresponding to different pixels according to an embodiment of the present invention;
FIG. 6 is a diagram of an HL table in accordance with an embodiment of the present invention;
FIG. 7 is a diagram of an HL table with display pixels according to an embodiment of the present invention;
FIGS. 8a 8b are color trend graphs provided by embodiments of the present invention;
FIG. 9 is a table illustrating gray-scale values of sub-pixels with different colors according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a first three-dimensional space according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Example one
Referring to fig. 3, fig. 3 is a schematic flow chart of a method for improving low color shift of a viewing angle by using an algorithm according to an embodiment of the present invention. The method for improving low color shift of viewing angle by using algorithm of the embodiment comprises:
acquiring sub-pixels of a picture pixel to be displayed;
distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
and obtaining the H value and the L value of the sub-pixel according to the corresponding point set.
In the embodiment of the invention, the sub-pixels are distributed in the three-dimensional space, and then the corresponding point sets are correspondingly obtained, so that the H value and the L value of the sub-pixels are obtained. The method of the embodiment of the invention does not increase the memory as much as possible, and considers the color cast of all colors of the visual angles, so that the visual angles reach the full color level optimization, and the optimal color cast state is shown on the optical representation.
Example two
Referring to fig. 3, fig. 3 is a schematic flow chart of a method for improving low color shift of a viewing angle by using an algorithm according to an embodiment of the present invention. The method for improving low color shift of viewing angle by using algorithm of the embodiment comprises:
step one, obtaining sub-pixels of a picture pixel to be displayed;
specifically, each frame of the picture to be displayed is composed of a plurality of pixels, each pixel includes a sub-pixel, and the sub-pixels corresponding to each pixel in the embodiment are an R sub-pixel, a G sub-pixel, and a B sub-pixel.
Distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
the preset mode includes a first preset mode and a second preset mode, the three-dimensional space includes a first three-dimensional space and a second three-dimensional space, and in this embodiment, the first preset mode and the first three-dimensional space are mainly utilized.
Specifically, the sub-pixels are distributed in a three-dimensional space according to a first preset mode to obtain a corresponding point set.
The first preset mode is to distribute the sub-pixels corresponding to each pixel in the first three-dimensional space according to the gray-scale values corresponding to the sub-pixels.
Further, referring to fig. 4, fig. 4 is a first three-dimensional space, which belongs to a three-dimensional space and is a three-dimensional space distributed at equal intervals, that is, each point in the three-dimensional space is arranged at equal intervals, that is, points are inserted at equal intervals in the X-axis, the Y-axis and the Z-axis, for example, every 1 point is inserted. The R sub-pixels correspond to the X axis, namely the R sub-pixels are distributed on the X axis according to the gray-scale values corresponding to the R sub-pixels; the G sub-pixels correspond to the Y axis, namely the G sub-pixels are distributed on the Y axis according to the gray-scale value corresponding to the G sub-pixels; the B sub-pixels correspond to the Z axis, that is, the B sub-pixels are distributed on the Z axis according to the gray scale value corresponding to the B sub-pixels, it should be understood that the R sub-pixels may also correspond to the Y axis or the Z axis, the G sub-pixels may also correspond to the X axis or the Z axis, the B sub-pixels may also correspond to the Y axis and the X axis, and the setting of the pitch size may be set according to specific needs, which is not specifically limited herein.
For example, referring to fig. 4, where Base Point is different pixel points, R, G, and B sub-pixels of the pixel Point 8 correspond to (96, 0, 0), the gray scale value of 96 corresponding to the R sub-pixel is distributed at the Point of 96 on the X axis, the gray scale value of 0 corresponding to the G sub-pixel is distributed at the Point of 0 on the Y axis, and the gray scale value of 0 corresponding to the B sub-pixel is distributed at the Point of 0 on the Z axis.
When the R sub-pixels, the G sub-pixels, and the B sub-pixels are distributed in the first three-dimensional space, a plurality of corresponding points closest to the R sub-pixels, the G sub-pixels, and the B sub-pixels may be selected in the first three-dimensional space, and if the number of corresponding points is 8, a set of the 8 corresponding points forms a corresponding point set, and the corresponding point set is a set of points closest to the R sub-pixels in the three-dimensional space.
Thirdly, obtaining the H value and the L value of the sub-pixel according to the corresponding point set;
step 3.1, acquiring an H value and an L value of the corresponding point set according to an HL table, wherein the corresponding point set comprises a plurality of corresponding points which are closest to pixel points in a three-dimensional space;
specifically, the Algorithm Low-viewing-angle Color Shift (ALCS) is to calculate the viewing-angle Color Shift of the Color by design using an Algorithm.
In the current DLCS (Digital Low Color Shift, i.e. the design of controlling the voltage of the sub-pixels by using the Digital signal of CB), RGB respectively has a set of same HL tables (HL tables) which are obtained by measuring the intrinsic Gamma value of the panel, and using the Gamma values of the R sub-pixel, the G sub-pixel and the B sub-pixel, a set of H value and L value which are obtained by trial and error calculation and correspond to the optimal Color Shift state of the optical side view angle, the H value corresponds to the high voltage, the L value corresponds to the Low voltage, the timing controller can correspondingly adjust the gray level values of the sub-pixels to the high gray level or the Low gray level, and each sub-pixel can be adjusted to different high gray levels or Low gray levels, i.e. according to the different high gray levels or Low gray levels corresponding to each sub-pixel, and then for each sub-pixel, the high gray level or the Low gray level with the best display effect is correspondingly selected from the obtained different high gray levels or Low gray levels, the high gray scale is larger than the original gray scale value of the sub-pixel, the low gray scale is smaller than the original gray scale value of the sub-pixel, namely the high gray scale or the low gray scale with the best display effect can be correspondingly selected corresponding to different R sub-pixels, G sub-pixels and B sub-pixels, and therefore an HL table is established according to the high gray scale or the low gray scale with the best display effect corresponding to different R sub-pixels, G sub-pixels and B sub-pixels, namely the high gray scale corresponds to an H value, and the low gray scale corresponds to an L value. For example, referring to fig. 6, after testing and debugging, when the gray scale value corresponding to the pixel point is 115, the H value of the R sub-pixel corresponds to the high gray scale of 165, the L value of the R sub-pixel corresponds to the low gray scale of 75, the H value of the G sub-pixel corresponds to the high gray scale of 165, the L value of the G sub-pixel corresponds to the low gray scale of 75, the H value of the B sub-pixel corresponds to the high gray scale of 165, and the L value of the B sub-pixel corresponds to the low gray scale of 75.
When the sub-pixels corresponding to a certain pixel point are distributed in a three-dimensional space, a plurality of points closest to the certain pixel point can be selected from the three-dimensional space, the points are corresponding points, the X-axis coordinate value of each corresponding point corresponds to an R sub-pixel in an HL table, the Y-axis coordinate value of each corresponding point corresponds to a G sub-pixel in the HL table, the Z-axis coordinate value of each corresponding point corresponds to a B sub-pixel in the HL table, and the high gray scale and the low gray scale of the X-axis coordinate value (namely the gray scale value of the R sub-pixel), the Y-axis coordinate value (namely the gray scale value of the G sub-pixel) and the Z-axis coordinate value (namely the gray scale value of the B sub-pixel) corresponding to the corresponding points can be obtained by corresponding each corresponding point to the established HL table, so as to determine the H value and the L value.
For example, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the pixel point correspond to (96, 0, 0), and the 8 closest corresponding points are (64, 0, 0), (64, 64, 0), (64, 0, 64), (64, 64, 64), (128, 0, 0), (128, 64, 0), (128, 0, 64), and (128, 64, 64), respectively.
And 3.2, obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point.
Step 3.2.1, calculating the calculated values of the H values and the calculated values of the L values of all the corresponding points by using a preset method;
preferably, the preset method is a linear interpolation method (ALCS 02). .
Specifically, in this embodiment, the gray-scale values of all corresponding points are arranged according to a set sequence, where the set sequence is from small to large or from large to small, for example, from large to small, and selectedTaking the 1 st corresponding point X of the first two bits1And the 2 nd corresponding point X2Calculating the H value and L value of a point between the 1 st corresponding point and the 2 nd corresponding point by linear interpolation (for example, the point is X)11) Then, the 3 rd corresponding point X of the third bit is calculated by using a linear interpolation method3And the 4 th corresponding point X at which the fourth bit is arranged4H and L values at some point in between (e.g., X at that point)12) By analogy, the point X can be obtained13、X14Etc., then calculating point X by linear interpolation11And point X12H and L values at some point in between (e.g., X at that point)111) Then, the point X is calculated by using a linear interpolation method13And point X14H and L values at some point in between (e.g., X at that point)112) Finally, the point X is calculated by using a linear interpolation method111And point X112H and L values at some point in between (e.g., X at that point)1111) Then X is finally obtained1111And the corresponding H value and L value are the calculated values of the H value and the L value of all the corresponding points which are finally obtained.
Step 3.2.2, obtaining the H value and the L value of the sub-pixel according to the calculated value of the H value and the calculated value of the L value of all the corresponding points;
specifically, the calculated values of H values and L values of all corresponding points are the H values and L values of the sub-pixels. That is, the calculated value of the H value of the R sub-pixel of the corresponding point is the H value of the R sub-pixel of the pixel in the picture to be displayed, the calculated value of the L value of the R sub-pixel of the corresponding point is the L value of the R sub-pixel of the pixel in the picture to be displayed, the calculated value of the H value of the G sub-pixel of the corresponding point is the H value of the G sub-pixel of the pixel in the picture to be displayed, the calculated value of the L value of the G sub-pixel of the corresponding point is the L value of the G sub-pixel of the pixel in the picture to be displayed, the calculated value of the H value of the B sub-pixel of the corresponding point is the H value of the B sub-pixel of the pixel in the picture to be displayed, and the calculated value of the L value of the B sub-pixel of the corresponding point is the L value of the B sub-pixel of the pixel in the picture to be displayed.
For example, referring to fig. 7, the high gray scale corresponding to the H value of the R sub-pixel corresponding to the pixel (80,90,80) obtained by the above method is 120 and the low gray scale is 64, the high gray scale corresponding to the H value of the G sub-pixel is 134 and the low gray scale is 50, and the high gray scale corresponding to the H value of the B sub-pixel is 112 and the low gray scale is 43; for example, the high gray scale corresponding to the H value of the R sub-pixel corresponding to the pixel (10,22,7) is 24 and the low gray scale is 0, the high gray scale corresponding to the H value of the G sub-pixel is 36 and the low gray scale is 2, and the high gray scale corresponding to the H value of the B sub-pixel is 18 and the low gray scale is 4.
At present, the existing DLCS technology is calculated in a one-dimensional space, a memory is added, and RGB obtained by the one-dimensional technology has the same set of HL tables, and the setting thereof cannot take into account the viewing angle color cast of all colors, only the optimal color cast state in the gray scale state is considered, please refer to fig. 8a to 8b, and if two colors in the national standard want to reach the respective optimal color cast states, the setting trends thereof are completely opposite. If the ALCS02 is adopted to simulate the three-dimensional space and the HL Table is calculated by the three-dimensional mode, the memory is multiplied, and the optimization of the H value and the L value of the full color gradation is considered, the requirement of the memory is greatly increased, thereby generating the technical contradiction. In order to solve the problem of viewing angle color shift, and need to consider viewing angle color shifts of all colors, and in order not to increase cost and memory, the embodiment utilizes a 2.5-dimensional space to simulate a three-dimensional space, and distributes R sub-pixels, G sub-pixels and B sub-pixels in the three-dimensional space, and uses point coordinates in the three-dimensional space to correspond to corresponding space coordinate values of gray scales of some reference points, and then obtains H values and L values of the reference points correspondingly through HL tables, and finally obtains a group of HL tables with different H values and L values through linear interpolation calculation.
The embodiment of the invention simulates a three-dimensional space through a 2.5-dimensional space, under the consideration of the interaction effect of R sub-pixels, G sub-pixels and B sub-pixels, the R sub-pixels, the G sub-pixels and the B sub-pixels are distributed in the three-dimensional space, H values and L values of corresponding points are found out from the sub-pixel points through HL tables, and then HL tables with different H values and L values of a group of R sub-pixels, G sub-pixels and B sub-pixels are obtained through a linear interpolation algorithm. Therefore, the requirement of a memory can be not increased as much as possible, and the color cast of all colors of visual angles can be considered simultaneously, so that the visual angles reach the full-color-level optimization, and the optimal color cast state is shown on the optical representation.
In the embodiment of the invention, points in the first three-dimensional space are used as corresponding points and are used as reference points of sub-pixels of the pixel, the reference points are already in an optimal state under the interaction of the R sub-pixel, the G sub-pixel and the B sub-pixel, the gray scale of the sub-pixels of the pixel automatically searches a plurality of corresponding points which are closest to the sub-pixels of the pixel in the three-dimensional space through an algorithm to be used as the reference points, and the optimal H value and the optimal L value which correspond to the sub-pixels of the pixel are obtained through a linear interpolation algorithm, so that the viewing angle reaches the full-color level optimization.
The point positions in the first three-dimensional space of the embodiment of the invention are distributed at equal intervals, and the embodiment of the invention has the advantage that the distance of each input gray scale to the reference point is stable, so that the optimal color cast state can be expressed on optical representation
EXAMPLE III
Referring to fig. 3, fig. 3 is a schematic flow chart of a method for improving low color shift of a viewing angle by using an algorithm according to an embodiment of the present invention. The method for improving low color shift of viewing angle by using algorithm of the embodiment comprises:
step one, obtaining sub-pixels of a picture pixel to be displayed;
specifically, referring to fig. 9, each frame of the to-be-displayed picture is composed of a plurality of pixels, each pixel includes a sub-pixel, in this embodiment, the sub-pixels corresponding to each pixel are an R sub-pixel, a G sub-pixel, and a B sub-pixel, and the gray-scale values corresponding to the R sub-pixel, the G sub-pixel, and the B sub-pixel are determined according to the color of the pixel correspondingly displayed in the national standard (China SPEC), for example, the color displayed by the pixel is Blue (Blue), the gray-scale value of the R sub-pixel is 56, the gray-scale value of the G sub-pixel is 61, and the gray-scale value of the B sub-pixel is 150.
Distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
the preset mode includes a first preset mode and a second preset mode, the three-dimensional space includes a first three-dimensional space and a second three-dimensional space, and the second preset mode and the second three-dimensional space are mainly utilized in the embodiment.
Specifically, the sub-pixels are distributed in the three-dimensional space according to a second preset mode to obtain a corresponding point set.
The second preset mode is to distribute the sub-pixels corresponding to each pixel in the second three-dimensional space according to the gray-scale values of the sub-pixels corresponding to the colors displayed by the pixels.
Further, referring to fig. 10, fig. 10 is a second three-dimensional space, where the second three-dimensional space belongs to a three-dimensional space and is a non-equidistant three-dimensional space, that is, each point in the three-dimensional space is arranged in a non-equidistant manner, that is, points are inserted in the three-dimensional space in a non-equidistant manner, and the points inserted in the three-dimensional space are arranged in a non-equidistant manner because the ratio of RGB in each color is different, so that the R sub-pixel, the G sub-pixel, and the B sub-pixel can be distributed in the second three-dimensional space in a non-equidistant manner. The R sub-pixels correspond to the X axis, namely the R sub-pixels are distributed on the X axis according to the gray-scale values corresponding to the R sub-pixels; the G sub-pixels correspond to the Y axis, namely the G sub-pixels are distributed on the Y axis according to the gray-scale value corresponding to the G sub-pixels; the B sub-pixels correspond to the Z axis, that is, the G sub-pixels are distributed on the Z axis according to the gray scale value corresponding to the B sub-pixels, it should be understood that the R sub-pixels may also correspond to the Y axis or the Z axis, the G sub-pixels may also correspond to the X axis or the Z axis, the B sub-pixels may also correspond to the Y axis and the Z axis, and the setting of the non-pitch size may be set according to specific needs, which is not limited herein.
When the gray scale values of the sub-pixels corresponding to the colors displayed by the pixels are distributed in the second three-dimensional space, a plurality of corresponding points closest to the second three-dimensional space can be selected in the second three-dimensional space, if the number of the corresponding points is 8, the set of the 8 corresponding points forms a corresponding point set, and the corresponding point set is the set of the points closest to the sub-pixels in the three-dimensional space.
Thirdly, obtaining the H value and the L value of the sub-pixel according to the corresponding point set;
step 3.1, acquiring an H value and an L value of the corresponding point set according to an HL table, wherein the corresponding point set comprises a plurality of corresponding points which are closest to pixel points in a three-dimensional space;
specifically, the Algorithm Low-viewing-angle Color Shift (ALCS) is to calculate the viewing-angle Color Shift of the Color by design using an Algorithm.
In the current DLCS (Digital Low Color Shift, i.e. using CB Digital signal to control the voltage of the sub-pixel), RGB respectively has a set of HL tables (HLtable), an instant timing controller can correspondingly adjust the gray level value of the sub-pixel to a high gray level or a Low gray level, and each sub-pixel can be adjusted to a different high gray level or a different Low gray level, i.e. according to the different high gray level or Low gray level corresponding to each sub-pixel, then for each sub-pixel, a high gray level or a Low gray level with the best display effect is correspondingly selected from the different obtained high gray levels or Low gray levels, wherein the high gray level is greater than the original gray level value of the sub-pixel, and the Low gray level is smaller than the original gray level value of the sub-pixel, i.e. corresponding to different R sub-pixels, G sub-pixels and B sub-pixels, so as to correspondingly select the high gray level or the Low gray level with the best display effect according to different R sub-pixels, And the high gray scale or the low gray scale with the best display effect corresponding to the G sub-pixel and the B sub-pixel is used for establishing an HL table, namely the high gray scale corresponds to an H value, and the low gray scale corresponds to an L value. For example, referring to fig. 6, after testing and debugging, when the gray scale value corresponding to the pixel point is 115, the H value of the R sub-pixel corresponds to the high gray scale of 165, the L value of the R sub-pixel corresponds to the low gray scale of 75, the H value of the G sub-pixel corresponds to the high gray scale of 165, the L value of the G sub-pixel corresponds to the low gray scale of 75, the H value of the B sub-pixel corresponds to the high gray scale of 165, and the L value of the B sub-pixel corresponds to the low gray scale of 75.
When the sub-pixels corresponding to a certain pixel point are distributed in a three-dimensional space, a plurality of points closest to the certain pixel point can be selected from the three-dimensional space, the points are corresponding points, the X-axis coordinate value of each corresponding point corresponds to an R sub-pixel in an HL table, the Y-axis coordinate value of each corresponding point corresponds to a G sub-pixel in the HL table, the Z-axis coordinate value of each corresponding point corresponds to a B sub-pixel in the HL table, and the high gray scale and the low gray scale of the X-axis coordinate value (namely the gray scale value of the R sub-pixel), the Y-axis coordinate value (namely the gray scale value of the G sub-pixel) and the Z-axis coordinate value (namely the gray scale value of the B sub-pixel) corresponding to the corresponding points can be obtained by corresponding each corresponding point to the established HL table, so as to determine the H value and the L value.
And 3.2, obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point.
Step 3.2.1, calculating the calculated values of the H values and the calculated values of the L values of all the corresponding points by using a preset method;
preferably, the preset method is a linear interpolation method (ALCS 02).
Specifically, in this embodiment, the gray-scale values of all corresponding points are arranged according to a set sequence, where the set sequence is from small to large or from large to small, for example, from large to small, and the 1 st corresponding point X of the first two arranged bits is selected1And the 2 nd corresponding point X2Calculating the H value and L value of a point between the 1 st corresponding point and the 2 nd corresponding point by linear interpolation (for example, the point is X)11) Then, the 3 rd corresponding point X of the third bit is calculated by using a linear interpolation method3And the 4 th corresponding point X at which the fourth bit is arranged4H and L values at some point in between (e.g., X at that point)12) By analogy, the point X can be obtained13、X14Etc., then calculating point X by linear interpolation11And point X12H and L values at some point in between (e.g., X at that point)111) Then, the point X is calculated by using a linear interpolation method13And point X14H and L values at some point in between (e.g., X at that point)112) Finally, the point X is calculated by using a linear interpolation method111And point X112H and L values at some point in between (e.g., X at that point)1111) Then X is finally obtained1111And the corresponding H value and L value are the calculated values of the H value and the L value of all the corresponding points which are finally obtained.
Step 3.2.2, obtaining the H value and the L value of the sub-pixel according to the calculated value of the H value and the calculated value of the L value of all the corresponding points;
specifically, the calculated values of H values and L values of all corresponding points are the H values and L values of the sub-pixels. That is, the calculated value of the H value of the R sub-pixel of the corresponding point is the H value of the R sub-pixel of the pixel in the picture to be displayed, the calculated value of the L value of the R sub-pixel of the corresponding point is the L value of the R sub-pixel of the pixel in the picture to be displayed, the calculated value of the H value of the G sub-pixel of the corresponding point is the H value of the G sub-pixel of the pixel in the picture to be displayed, the calculated value of the L value of the G sub-pixel of the corresponding point is the L value of the G sub-pixel of the pixel in the picture to be displayed, the calculated value of the H value of the B sub-pixel of the corresponding point is the H value of the B sub-pixel of the pixel in the picture to be displayed, and the calculated value of the L value of the B sub-pixel of the corresponding point is the L value of the B sub-pixel of the pixel in the picture to be displayed.
At present, the existing DLCS technology is calculated in a one-dimensional space, a memory is added, and RGB obtained by the one-dimensional technology has a group of HL tables, and the setting thereof cannot take into account the viewing angle color cast of all colors, please refer to fig. 8a, where the setting trends of two colors in the national standard are completely opposite. If the ALCS02 is adopted to simulate the three-dimensional space and the HL Table is calculated by the three-dimensional mode, the memory is multiplied, and the optimization of the H value and the L value of the full color gradation is considered, the requirement of the memory is greatly increased, thereby generating the technical contradiction. In order to solve the problem of viewing angle color shift, and need to consider viewing angle color shifts of all colors, and in order not to increase cost and memory, the embodiment utilizes a 2.5-dimensional space to simulate a three-dimensional space, and distributes R sub-pixels, G sub-pixels and B sub-pixels in the three-dimensional space, and uses point coordinates in the three-dimensional space to correspond to corresponding space coordinate values of gray scales of some reference points, and then obtains H values and L values of the reference points correspondingly through HL tables, and finally obtains a group of HL tables with different H values and L values through linear interpolation calculation.
The embodiment of the invention simulates a three-dimensional space through a 2.5-dimensional space, under the consideration of the interaction effect of R sub-pixels, G sub-pixels and B sub-pixels, the R sub-pixels, the G sub-pixels and the B sub-pixels are distributed in the three-dimensional space, H values and L values of corresponding points are found out from the sub-pixel points through HL tables, and then HL tables with different H values and L values of a group of R sub-pixels, G sub-pixels and B sub-pixels are obtained through a linear interpolation algorithm. Therefore, the requirement of a memory can be not increased as much as possible, and the color cast of all colors of visual angles can be considered simultaneously, so that the visual angles reach the full-color-level optimization, and the optimal color cast state is shown on the optical representation.
In the embodiment of the invention, points in the second three-dimensional space are used as corresponding points and are used as reference points of sub-pixels of the pixel, the reference points are already in an optimal state under the interaction of the R sub-pixel, the G sub-pixel and the B sub-pixel, the gray scale of the sub-pixels of the pixel automatically searches a plurality of corresponding points which are closest to the sub-pixels of the pixel in the three-dimensional space through an algorithm to be used as the reference points, and the optimal H value and the optimal L value which correspond to the sub-pixels of the pixel are obtained through a linear interpolation algorithm, so that the viewing angle reaches the full-color level optimization.
The point positions in the second three-dimensional space of the embodiment of the invention are distributed at equal intervals, and the invention has the advantages that the distance of each input gray scale to the reference point is stable, and the optimal color cast state is shown on the optical representation.
According to the embodiment of the invention, the reference point position in the second three-dimensional space is set according to the national standard by adopting the color or the specification which is generally concerned in the industry, so that the operation resources can be concentrated on the color, and the improvement effect is obvious.
Example four
The embodiment of the present invention further provides a device for improving low color shift of viewing angle by using an algorithm, which is implemented in a timing processor of a display panel, and the device comprises: an acquisition unit, a corresponding point set conversion unit and a calculation unit, wherein,
the device comprises an acquisition unit, a display unit and a display unit, wherein the acquisition unit is used for acquiring sub-pixels of a picture pixel to be displayed;
the corresponding point set conversion unit is used for distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
specifically, the corresponding point set converting unit may distribute the sub-pixels in a three-dimensional space according to a first preset manner to obtain a corresponding point set; or the corresponding point set converting unit may distribute the sub-pixels in the three-dimensional space according to a second preset manner to obtain a corresponding point set, where the corresponding point set is a set of points closest to the sub-pixels in the three-dimensional space.
And the calculating unit is used for obtaining the H value and the L value of the sub-pixel according to the corresponding point set.
Specifically, an H value and an L value of the corresponding point set are obtained according to an HL table, and the corresponding point set comprises a plurality of corresponding points; and obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point.
Obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point includes: calculating the calculated values of the H values and the calculated values of the L values of all the corresponding points by using a preset method; and obtaining the H value and the L value of the sub-pixel according to the calculated values of the H value and the calculated value of the L value of all the corresponding points, wherein the preset method is a linear interpolation method.
The embodiment of the invention also provides a display panel, which comprises a time sequence controller, and the time sequence processor comprises the device for improving the low color cast of the visual angle by using the algorithm.
The device for improving low color cast at the visual angle by using the algorithm and the display panel thereof do not increase the memory as much as possible, and also consider the color cast at the visual angle of all colors, so that the visual angle reaches the full color level optimization, and the optimal color cast state is shown on the optical performance.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A method for improving low color shift of viewing angle by using an algorithm, comprising:
acquiring sub-pixels of a picture pixel to be displayed;
distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
obtaining the H value and the L value of the sub-pixel according to the corresponding point set;
obtaining the H value and the L value of the sub-pixel according to the corresponding point set, including:
acquiring an H value and an L value of the corresponding point set according to an HL table, wherein the corresponding point set comprises a plurality of corresponding points;
and obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point.
2. The method of claim 1, wherein distributing the sub-pixels in a predetermined manner in a three-dimensional space to obtain a corresponding set of points comprises:
distributing the sub-pixels in a three-dimensional space according to a first preset mode to obtain a corresponding point set;
the first preset mode is to distribute the sub-pixels corresponding to each pixel in the first three-dimensional space according to the gray-scale values corresponding to the sub-pixels.
3. The method of claim 1, wherein distributing the sub-pixels in a predetermined manner in a three-dimensional space to obtain a corresponding set of points comprises:
distributing the sub-pixels in a three-dimensional space according to a second preset mode to obtain a corresponding point set;
the second preset mode is to distribute the sub-pixels corresponding to each pixel in the second three-dimensional space according to the gray-scale value of the sub-pixels corresponding to the color displayed by the pixel.
4. The method of claim 1, wherein deriving the H value and the L value of the sub-pixel from the H value and the L value of the corresponding point comprises:
calculating the calculated values of the H values and the calculated values of the L values of all the corresponding points by using a preset method;
and obtaining the H value and the L value of the sub-pixel according to the calculated values of the H value and the calculated value of the L value of all the corresponding points.
5. The method of claim 4, wherein the predetermined method is a linear interpolation method.
6. The method of claim 1, wherein the set of corresponding points is a set of closest points in three-dimensional space to the sub-pixels.
7. An apparatus for improving low color shift at viewing angles using an algorithm implemented in a timing processor of a display panel, comprising:
the device comprises an acquisition unit, a display unit and a display unit, wherein the acquisition unit is used for acquiring sub-pixels of a picture pixel to be displayed;
the corresponding point set conversion unit is used for distributing the sub-pixels in a three-dimensional space according to a preset mode to obtain a corresponding point set;
the calculating unit is used for obtaining the H value and the L value of the sub-pixel according to the corresponding point set;
obtaining the H value and the L value of the sub-pixel according to the corresponding point set, including:
acquiring an H value and an L value of the corresponding point set according to an HL table, wherein the corresponding point set comprises a plurality of corresponding points;
and obtaining the H value and the L value of the sub-pixel according to the H value and the L value of the corresponding point.
8. A display panel comprising a timing controller in said display panel, wherein said timing processor comprises the apparatus for improving low color shift at viewing angles using the algorithm of claim 7.
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