CN113327560B

CN113327560B - Method and device for improving large-viewing-angle color cast and display panel

Info

Publication number: CN113327560B
Application number: CN202010129708.2A
Authority: CN
Inventors: 黄小骅; 王柏钧; 赵玉财
Original assignee: Xianyang Caihong Optoelectronics Technology Co Ltd
Current assignee: Xianyang Caihong Optoelectronics Technology Co Ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2022-11-18
Anticipated expiration: 2040-02-28
Also published as: CN113327560A

Abstract

The invention discloses a method and a device for improving large-viewing-angle color cast and a display panel, wherein the method comprises the following steps: inputting a gray scale value of an original image; converting the gray-scale value of any pixel of the original image into the brightness with the Gamma of 2.2 through photoelectric conversion; obtaining the optimal HL tables of the three sub-pixels through color separation logic calculation according to the brightness proportion of the three sub-pixels RGB in the pixel; the HL Table is output. The display panel comprises the calculation method and the device for improving the large-view-angle color cast, the calculation principle is utilized to take into account the view-angle color cast of all colors, a group of better and new RGB HL tables is obtained through design calculation, the calculation method is utilized to enable the view angle to reach the full color level HL optimization, and therefore the color cast is more superior in optical representation, and the improvement of the large-view-angle color cast is optimized.

Description

Method and device for improving large-viewing-angle color cast and display panel

Technical Field

The invention belongs to the technical field of display, and particularly relates to a method and a device for improving large-viewing-angle color cast 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 (VA) is one of the wide viewing angle technologies currently widely used in liquid crystal display panels. For a display device using a VA (vertical alignment) panel, there is often a color washout phenomenon in side view as compared with a front view. In order to solve the color shift problem in the LCD industry, several technologies are used to improve the taste of Panel (display Panel), and one way to reduce the color shift is to use a Low Color Shift (LCS) technology to divide each Sub-pixel (Sub pixel) into two regions, and to separately control or use a capacitive coupling discharge method to make the two regions respectively display a high gray level and a low gray level; for example, 8-Domain VA mode (8 Domain VA mode), which combines pixels (pixels) with high and low sub-pixels, compensates for the viewing angle color shift of the liquid crystal at the side viewing angle.

Another method for reducing color shift is to use a Digital Low Color Shift (DLCS) technique to adjust the display gray scale value of the sub-pixels or the voltage of the sub-pixels by using a digital signal control method of a control board or a drive board (CB), and to create two Gamma (Gamma) curves on the basis of the defined gray scale of 12-bits to maintain the 4K image quality, for example, to make the adjacent sub-pixels respectively display a high gray scale and a low gray scale, which can also improve the color shift and the aperture ratio thereof can be larger than that of the conventional low color shift technique, such as a 4-Domain VA mode digital low color shift (4 Domain VA mode DLCS).

When the sub-pixel is a 4Domain VA mode without the DLCS technology, color shift occurs in 45 ° and 60 ° side views, such as white shift shown in fig. 1a, 1b, and 1c, and the color shift of the viewing angle is shown on the Gamma curve as shown in fig. 2a, the larger the viewing angle is, the larger the Gamma is, the more the color shift is; the 4Domain VA mode DLCS shown in fig. 2b is a virtual 8Domain VA mode based on the 4Domain VA mode added with DLCS technology, which can also improve the color shift problem, and the technology can obtain a higher penetration rate, which is about 20% to 30% higher than that of the 8Domain VA mode.

However, in the current DLCS or ALCS (algorithmic Low Color Shift) technology, as shown in fig. 2c and fig. 2d, sub pixel red, green, and blue (RGB) respectively have a set of Low Color Shift compensation parameter tables (HL tables), only the HL Table of one white Color is considered, the setting of the HL Table cannot take into account the viewing angle Color Shift of all colors, the Color Shift problem still exists when viewing from a large viewing angle side, and the setting trends of two colors in the national standard shown in fig. 3a and fig. 3b are completely opposite.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides a method and an apparatus for improving color shift with large viewing angle, and a display panel. The technical problem to be solved by the invention is realized by the following technical scheme:

the embodiment of the invention firstly provides an algorithm method for improving the color cast of a large visual angle, which comprises the following steps:

inputting original image data;

converting the gray-scale value of any pixel of the original image into the brightness of a preset Gamma value through photoelectric conversion;

obtaining new HL tables of the three sub-pixels through color separation logic calculation according to the brightness proportion of the RGB of the three sub-pixels in the pixel;

and outputting the HL Table and performing color cast compensation.

In a specific embodiment, the preset Gamma value is 2.2, and the HL Table stores an HL value.

In one embodiment, the color separation logic calculation process includes:

taking any pixel;

calculating the proportion of each color in each sub pixel of the pixels through color separation logic;

and obtaining the final HL tables of the RGB through the HL tables of the colors according to the proportion.

In a specific embodiment, the HL tables of the colors refer to HL tables of multiple national standard colors including white, including:

HL Table for R (red) G (green) B (blue);

medi (middle value) HL value for C (cyan), Y (yellow), M (Magenta, violet).

In a particular embodiment, the HL values of the medi (C, Y, M) are different;

the HL values of the G and the B are different;

the HL values of the R and the G are different;

and the HL values of the R and the B are different.

In a specific embodiment, the HL value of any one of the sub-pixels is related to the other two sub-pixels.

In one embodiment, the three sub-pixel RGB of the pixel includes: max sub pixel, medi sub pixel, min sub pixel; the HL value of the max sub pixel is calculated by the color separation of three colors; the medi sub pixel is calculated by two colors participating in color separation; the min sub pixel is calculated by a color participating in color separation.

In one embodiment, the new HL Table is an optimal HL Table, the output of which is used to make large viewing angles exhibit low color cast.

An embodiment of the present invention further includes an arithmetic device for improving the large-viewing angle low color shift, which is used for implementing any of the arithmetic methods for improving the large-viewing angle color shift in a driving and control system of a display device, 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 conversion unit is used for converting the sub-pixel gray-scale value into the brightness of a preset Gamma value;

the calculation unit is used for calculating to obtain new HL tables of the three sub-pixels according to the brightness proportion of the three sub-pixels in the pixel;

and the output unit is used for outputting the HL Table and performing color cast compensation.

An embodiment of the invention further includes a display panel including the calculation apparatus for improving color shift of large viewing angle.

Compared with the prior art, the invention has the following beneficial effects:

the embodiment of the invention aims at all colors in HL tables of 7 colors or national standards, utilizes the algorithm color separation principle to take account of the viewing angle color deviation of all colors, obtains a group of better and new HL tables of RGB by design and calculation, and utilizes the algorithm to optimize the viewing angle to reach the full color level HL, so that the color deviation is more superior in optical representation, and the improvement of the large viewing angle color deviation is optimized.

Drawings

FIGS. 1a to 1c are schematic diagrams illustrating a color cast phenomenon of a display screen at different viewing angles according to the present invention;

FIG. 2a is a schematic diagram illustrating a relationship between gray scale values and gamma values at different viewing angles according to the present invention;

FIG. 2b is a schematic diagram of the relationship between the gray scale value and gamma value of 4Domain VA mode + ALCS;

FIG. 2c is a schematic diagram of Sub Pixel of 4Domain + ALCS of the present invention;

FIG. 2d is a schematic diagram of ALCS technology for the HL Table of white color in accordance with the present invention;

3 a-3 b are schematic diagrams of the setting trends of two colors in the national standard of the invention;

fig. 4a to 4b are schematic diagrams illustrating a flow of a calculation method for improving color shift of a large viewing angle according to an embodiment of the present invention;

fig. 5a is a schematic diagram of photoelectric conversion provided by an embodiment of the present invention;

fig. 5b is a schematic diagram of an arrangement of img _ cur _ ln image electrical signals of m × n img Input according to an embodiment of the present invention;

fig. 5c is a schematic diagram of an arrangement of the img _ pre _ ln image electronic signals of m × n img Input according to the embodiment of the present invention;

FIG. 5d is a schematic diagram of a process of obtaining luminance through photoelectric conversion according to an embodiment of the present invention;

FIG. 6a is a schematic diagram of a calculation process of a color separation logic according to an embodiment of the present invention;

FIG. 6b is a sub-pixel diagram in the color separation logic calculation process according to an embodiment of the present invention;

FIG. 6c is a schematic diagram of a process for calculating an optimal HL value for sub-pixel luminance according to the embodiment of the invention;

FIG. 7a is a schematic diagram of a color separation principle according to an embodiment of the present invention;

FIG. 7b is a schematic diagram illustrating a photoelectric conversion process of RGB gray-scale values and RGB luminance values according to an embodiment of the present invention;

FIG. 7c is a schematic diagram illustrating the proportion of each color in each sub-pixel according to an embodiment of the present invention;

FIG. 8a is a schematic diagram of an input/output process of the multi-color separation algorithm according to the embodiment of the present invention;

fig. 8b is a simulation diagram of a display screen before and after color shift improvement for a large viewing angle 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. As used herein, the terms "vertical," "horizontal," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Example one

Referring to fig. 4a and fig. 4b, fig. 4a to fig. 4b are schematic flow charts of a calculation method for improving color cast with a large viewing angle according to an embodiment of the present invention. The calculation method for improving the color cast of the large viewing angle of the embodiment includes:

s1, inputting original image data;

specifically, please refer to fig. 5b and 5c, specifically, as shown in fig. 5b and 5c, fig. 5b is a schematic diagram of an arrangement of electronic signals of an img _ cur _ ln image of an m × n img Input according to an embodiment of the present invention, and fig. 5c is a schematic diagram of an arrangement of electronic signals of an img _ pre _ ln image of an m × n img Input according to an embodiment of the present invention; when the artwork or the function graph (img) data is input (data.in), 4P img _cur _inand img _ pre _ in are input from four ports (4 ports) by one clock signal (1 ClK) for example, with 4P being input at a time.

S2, converting the gray value of any pixel of the original image into the brightness of a preset Gamma value through photoelectric conversion;

specifically, please refer to fig. 5a, fig. 5a is a schematic diagram of a photoelectric conversion according to an embodiment of the present invention; for example, a Gamma value of 2.2 is preset, and the spatial arrangement of the sub-pixels of pixels in the storage unit of the display panel is shown in table 1; as shown in fig. 5, fig. 5d is a schematic diagram of a process of obtaining luminance through photoelectric conversion according to an embodiment of the present invention, a calculation formula of the luminance value after photoelectric conversion is Ln = L256 × 10^ (2.2 × log (n/256)), and a calculation formula of the luminance of each sub-pixel is:

R1PL＝256*10^(2.2*Log(R1P/256))

G1PL＝256*10^(2.2*Log(G1P/256))

B1PL＝256*10^(2.2*Log(B1P/256))

TABLE 1

S3, according to the brightness proportion of the three sub-pixels RGB in the pixel, obtaining new HL tables of the three sub-pixels through color separation logic calculation;

specifically, referring to fig. 6, fig. 6a is a schematic diagram of a color separation logic calculation process according to an embodiment of the present invention; FIG. 6b is a sub-pixel diagram in the color separation logic calculation process according to an embodiment of the present invention; fig. 6c is a schematic diagram of a process of calculating an optimal HL to obtain a sub-pixel luminance according to color separation according to an embodiment of the present invention. In the color separation logic calculation process, any one pixel is selected, the proportion of each color in each sub pixel of the pixel is calculated through the color separation logic, and then the HL value of the RGB is obtained through the HL Table of each color according to the proportion.

In this embodiment, the HL tables of the colors refer to HL tables of various national standard colors including white, which include: HL Table and medi (intermediate) C (cyan), Y (yellow), M (Magenta or Magenta), HL value of W (white) for R (red) G (green) B (blue); and HL values of medi (C, Y, M), HL values of G and B, HL values of R and G, and HL values of R and B are different from each other. For example, the HL Table of the initial rgbcywmw is Input (Input), specifically as shown in Table 2, and the spatial arrangement of the sub-pixels of the pixel in the storage unit of the display panel is shown in Table 3; through the color separation logic calculation of the color separation principle, the three sub-pixels present the conditions of R1PL = max, G1PL = medi and B1P1= min in pixel, and the optimal HL value calculated by the final color separation is as follows:

RH1P＝(R1PL-G1PL)/RIPL*[R]RH+(G1PL-B1PL)/R1PL*[Y]RH+B1PL/R1PL*[W]RH

RL1P＝(R1PL-G1PL)/RIPL*[R]RL+(G1PL-B1PL)/R1PL*[Y]RL+B1PL/R1PL*[W]RL

GH1P＝(G1PL-B1PL)/G1PL*[Y]GH+B1PL/G1PL*[B]GH

GL1P＝(G1PL-B1PL)/G1PL*[Y]GL+B1PL/G1PL*[B]GL

BH1P＝B1PL/B1PL*[W]BH

BL1P＝B1PL/B1PL*[W]BL

TABLE 2

TABLE 3

Specifically, in the color separation logic calculation process, a pixel is arbitrarily selected, the proportion of each color in each sub-pixel of the pixel is calculated through the color separation logic, and the HL value of RGB is obtained through the HL Table of each color according to the proportion, wherein the specific calculation formula is as follows:

RH＝(253.8-55.7)/253.8*[R]RH+(55.7-11.7)/253.8*[Y]RH+11.7/253.8*[W]RH

RL＝(253.8-55.7)/253.8*[R]RL+(55.7-11.7)/253.8*[Y]RL+11.7/253.8*[W]RL

GH＝(55.7-11.7)/55.7*[Y]GH+11.7/55.7*[W]GH

GL＝(55.7-11.7)/55.7*[Y]GL+11.7/55.7*[W]GL

BH＝11.7/11.7*[W]BH

BL＝11.7/11.7*[W]BL

further, the optimal HL value is stored in the low color shift adopted optical quality adjustment parameter Table HL Table shown in Table 4, so as to be called when performing the low color shift compensation operation.

TABLE 4

And S4, outputting the new HL Table and performing color cast compensation.

Based on the above steps, this embodiment uses the algorithm color separation principle to consider the viewing angle color shift of all colors for all colors in the HL tables of 7 colors or national standard, designs and calculates to obtain a set of better and new HL tables of RGB, and uses the algorithm to optimize the viewing angle to reach the full color level HL, so that the color shift is more superior in optical representation, and the improvement of the large viewing angle color shift is optimized.

Example two

Referring to fig. 4a and 4b again, fig. 4a to 4b are schematic flow charts of a calculation method for improving color shift of a large viewing angle according to an embodiment of the present invention. The calculation method for improving the large viewing angle color cast of the embodiment includes:

s1, inputting original image data;

specifically, please refer to fig. 5b and fig. 5c, specifically referring to fig. 5b and fig. 5c, fig. 5b is a schematic diagram of an arrangement of electronic signals of an img _ cur _ ln image of m × n img Input according to an embodiment of the present invention, and fig. 5c is a schematic diagram of an arrangement of electronic signals of an img _ pre _ ln image of m × n img Input according to an embodiment of the present invention; when the original or function graph (img) data is input (data.in), for example, 4P is input at a time, and 4P img _cur _, and img _ pre _ in are input from four ports (4 ports) by one clock signal (1 ClK).

specifically, please refer to fig. 5a, fig. 5a is a schematic diagram of photoelectric conversion according to an embodiment of the present invention; for example, a Gamma value of 2.2 is preset, and the spatial arrangement of the sub-pixels of pixels in the storage unit of the display panel is shown in table 1; as shown in fig. 5, fig. 5d is a schematic diagram of a process of obtaining luminance through photoelectric conversion according to an embodiment of the present invention, a calculation formula of the luminance value after photoelectric conversion is Ln = L256 × 10^ (2.2 × log (n/256)), and a calculation formula of the luminance of each sub-pixel is:

R1PL＝256*10^(2.2*Log(R1P/256))

G1PL＝256*10^(2.2*Log(G1P/256))

B1PL＝256*10^(2.2*Log(B1P/256))

TABLE 1

specifically, please refer to fig. 6a and 6c, fig. 6a is a schematic diagram of a color separation logic calculation process according to an embodiment of the present invention; FIG. 6c is a schematic diagram of a process for calculating an optimal HL value for sub-pixel luminance according to color separation according to the embodiment of the present invention; in the color separation logic calculation process, one pixel is arbitrarily selected, the proportion of each color in each sub-pixel of the pixel is calculated through the color separation logic, and then the HL value of RGB is obtained through the HL Table of each color according to the proportion, and furthermore, the HL Table of each color in this embodiment refers to the HL tables of various national standard colors including white, including: HL Table of R (Red) G (Green) B (blue) and medi (middle) C (cyan), Y (yellow), M (Magenta or Magenta), HL value of W (white); and HL values of medi (C, Y, M), HL values of G and B, HL values of R and G, and HL values of R and B are different from each other.

Further, please refer to fig. 6b, where fig. 6b is a sub-pixel diagram in the color separation logic calculation process according to the embodiment of the present invention. The HL value of any one sub pixel in a pixel (pixel) is related to the other two sub pixels, and the three sub pixel RGB of the pixel comprises: max sub pixel, medi sub pixel, min sub pixel; the HL value of the max sub pixel is calculated by the color separation of three colors; the medi sub pixel is calculated by two colors participating in color separation; the min sub pixel is calculated by a color participating in color separation.

Specifically, for example, an HL Table of the initial RGBCYMW is Input (Input), as shown in Table 2, and the spatial arrangement of the sub-pixels of the pixel in the storage unit of the display panel is shown in Table 3; through the color separation logic calculation of the color separation principle, the three sub-pixels present the conditions of R1PL = max, G1PL = medi and B1P1= min in pixel, and the optimal HL value calculated by the final color separation is as follows:

RH1P＝(R1PL-G1PL)/RIPL*[R]RH+(G1PL-B1PL)/R1PL*[Y]RH+B1PL/R1PL*[W]RH

RL1P＝(R1PL-G1PL)/RIPL*[R]RL+(G1PL-B1PL)/R1PL*[Y]RL+B1PL/R1PL*[W]RL

GH1P＝(G1PL-B1PL)/G1PL*[Y]GH+B1PL/G1PL*[B]GH

GL1P＝(G1PL-B1PL)/G1PL*[Y]GL+B1PL/G1PL*[B]GL

BH1P＝B1PL/B1PL*[W]BH

BL1P＝B1PL/B1PL*[W]BL

TABLE 2

TABLE 3

Specifically, the color separation logic calculation formula is as follows:

RH＝(253.8-55.7)/253.8*[R]RH+(55.7-11.7)/253.8*[Y]RH+11.7/253.8*[W]RH

RL＝(253.8-55.7)/253.8*[R]RL+(55.7-11.7)/253.8*[Y]RL+11.7/253.8*[W]RL

GH＝(55.7-11.7)/55.7*[Y]GH+11.7/55.7*[W]GH

GL＝(55.7-11.7)/55.7*[Y]GL+11.7/55.7*[W]GL

BH＝11.7/11.7*[W]BH

BL＝11.7/11.7*[W]BL

further, the optimal HL value is stored in the low color shift HL Table shown in Table 4, so as to be called during the low color shift compensation operation.

TABLE 4

And S4, outputting the new HL Table and performing color cast compensation.

EXAMPLE III

The calculation device for improving the large viewing angle and the low color cast provided by the embodiment of the invention is used for realizing the method in the driving and control system of the display device. For example, a conventional or active matrix display device generally comprises: a display panel having a gate driving circuit and a source driving circuit thereon; the display control circuit on the driving circuit board is electrically connected with the gate driving circuit and the source driving circuit; the system-level chip on the system board is internally provided with an optical quality adjustment IP core; and the connecting assembly is electrically connected with the display panel, the driving circuit board, the system board and each module of the system board.

Generally, a display control circuit includes a level conversion circuit, a direct current voltage conversion circuit, and a Gamma correction circuit; the direct current voltage conversion circuit is used for receiving an input direct current voltage and generating a grid switch voltage and a reference voltage according to the input direct current voltage, and the grid switch voltage and the reference voltage are respectively transmitted to the level conversion circuit and the Gamma correction circuit; the level conversion circuit is used for receiving the reference timing signal to generate a grid control signal to the grid driving circuit according to the reference timing signal and the grid switch voltage; the Gamma correction circuit generates a plurality of Gamma voltages to the source drive circuit according to the reference voltage.

In particular, the display control circuit sometimes further includes a signal conversion circuit, and by additionally providing the signal conversion circuit (for example, in the form of a chip) in the display control circuit, the signal conversion circuit performs interface signal conversion on one side, so that an interface between a driver in the source driving circuit and the driving circuit board assembly performs conversion; on the other hand, the signal conversion circuit can generate a time sequence control signal required by the display panel, and is convenient for panel factories to debug and revise the panel.

Generally, the driving circuit board further has a nonvolatile memory, and the nonvolatile memory stores an optical quality adjustment parameter table. In this way, the system on chip can read the optical quality adjustment parameters stored in the non-volatile memory of the driving circuit board through the connection component in a suitable communication manner and load the optical quality adjustment parameters to the optical quality adjustment IP core to adjust the optical quality of the display panel.

Specifically, the optical quality adjustment IP kernel includes a Mura elimination (Demura) IP kernel, a white balancing (white tracking) adjustment IP kernel, a low color shift (low color shift) compensation IP kernel, an over-voltage drive (OD) IP kernel, and a dither processing IP kernel; correspondingly, the optical quality adjustment parameter table comprises a Mura elimination parameter table, a white balance adjustment parameter table, a low color cast compensation parameter table, an overvoltage driving parameter table and a jitter processing parameter table.

More specifically, the Mura elimination IP core is configured to perform a Mura (i.e., a phenomenon of various traces due to uneven display brightness) elimination operation according to a Mura elimination parameter table, the white balance adjustment IP core is configured to perform a white balance adjustment operation according to the white balance adjustment parameter table, the low color shift compensation IP core is configured to perform a low color shift compensation operation according to the low color shift compensation parameter table so that the display panel achieves a low color shift display quality, the overdrive IP core is configured to perform an overdrive operation according to the overdrive parameter table, and the dither processing IP core is configured to perform a dither processing operation, such as temporal dither processing (temporal dither) and/or spatial dither processing (spatial dither processing), according to the dither processing parameter table.

In a driving and controlling system (driving circuit board or system board) of a display device, the calculating device for improving a large viewing angle and a low color shift provided in this embodiment specifically includes: 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 conversion unit is used for converting the sub-pixel gray-scale value into the brightness of a preset gamma value; the calculation unit is used for calculating to obtain a new HL table of the three sub-pixels according to the brightness proportion of the three sub-pixels in the pixel; and the output unit is used for outputting the HL table and performing low color cast compensation.

The parameters, methods or devices required for the Mura elimination operation, the white balance adjustment operation, the over-voltage driving operation and the dithering operation are known mature technologies and are not described herein again.

In this embodiment, an arithmetic unit for improving the large viewing angle and the low color shift is built in the display device to realize the methods of the foregoing embodiments, and for all colors in the HL tables or national standards of 7 colors, an arithmetic-color separation principle is used to take into account the viewing angle color shifts of all colors, and a set of better and new RGB HL tables is obtained through design and calculation, and the viewing angle of the display device is optimized to full color level HL by using an arithmetic method, so that the color shift in optical representation is more superior, and the improvement of the large viewing angle color shift is optimized.

Example four

The embodiment of the present invention further provides a display panel, which includes the calculation apparatus for improving color shift of a large viewing angle described in the third embodiment, and by implementing the method described in the first embodiment or the second embodiment, the viewing angle of the display panel can be optimized to a full color level HL, so that the color shift in optical performance is more excellent, and the improvement of the color shift of the large viewing angle can be optimized.

The optical quality adjustment parameters, methods or devices of the display panel and the specific structure of the display device are well known and mature technologies, and are not described herein again.

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. Some english letters or english words belong to code or terms, which are used for convenience of description or calling by industry custom, and cannot be interpreted as being disadvantageous to the present invention or limiting or restricting the present invention. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.

Claims

1. An algorithm method for improving color cast at large viewing angles, comprising:

inputting original image data;

obtaining a new HL table of the three sub-pixels through color separation logic calculation according to the brightness proportion of the RGB sub-pixels in the pixel;

outputting the HL table and performing color cast compensation;

wherein the HL value of any one sub-pixel in the pixel is related to the other two sub-pixels;

wherein three sub-pixels RGB of the pixel comprise: largest, middle, and smallest sub-pixels;

the HL value of the maximum sub-pixel is calculated by the color separation of three colors;

the middle sub-pixel is calculated by two colors participating in color separation;

the minimum sub-pixel is calculated by one color participating in color separation.

2. The method of claim 1,

the preset gamma value is 2.2;

the HL table is used for storing HL values.

3. The method of claim 2,

the color separation logic calculation process comprises the following steps:

arbitrarily taking one pixel;

calculating the proportion of each color in each sub-pixel of the pixel through color separation logic;

and obtaining the final HL table of RGB through the HL tables of all colors according to the proportion.

4. The method according to claim 3, wherein the HL tables for the respective colors refer to HL tables of a plurality of national standard colors including white, which comprises:

HL value for R G B;

HL value for Medi (C, Y, M);

where R denotes red, G denotes green, B denotes blue, C denotes cyan, Y denotes yellow, M denotes magenta or magenta, and medi denotes an intermediate value.

5. The method of claim 4,

the HL values of C, Y and M are different;

the HL values of the G and the B are different;

the HL values of the R and the G are different;

and the HL values of the R and the B are different.

6. The method of claim 1,

the new HL table is an optimal HL table, the output of which is used to make large viewing angles show low color cast.

7. A calculation apparatus for improving color shift at large viewing angles, which is used for implementing the method of any one of claims 1-6 in a driving and control system of a display apparatus, comprising:

the calculation unit is used for calculating and obtaining a new HL table of the three sub-pixels according to the brightness proportion of the three sub-pixels in the pixel;

8. A display panel comprising the calculation apparatus for improving color shift with large viewing angle according to claim 7.