CN107863083B

CN107863083B - Driving method and driving device of display device

Info

Publication number: CN107863083B
Application number: CN201711381859.1A
Authority: CN
Inventors: 何怀亮
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2019-12-13
Anticipated expiration: 2037-12-20
Also published as: CN107863083A; WO2019119791A1

Abstract

A driving method of a display device, comprising: obtaining chromaticity coordinates of sub-pixels corresponding to each pixel unit in a preset area in an RGB color gamut space; respectively calculating data characteristic values of a plurality of chromaticity coordinates of each sub-pixel in a preset area in the RGB color gamut space according to the chromaticity coordinates of the sub-pixels in the RGB color gamut space; converting the data characteristic value of the chromaticity coordinate of the sub-pixel in the RGB color gamut space into the chromaticity coordinate in the LCH color gamut space; if the saturation and hue in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel in the sub-pixels in the preset area are increased according to the third preset condition. The gamma values of the green sub-pixel and the blue sub-pixel in the adjusted sub-pixels become larger, so that the brightness proportion of the green sub-pixel and the blue sub-pixel under a large visual angle is reduced relative to that of the red sub-pixel, and the vividness of the hue of the red sub-pixel under the large visual angle can be improved, thereby playing a role in adjusting color cast.

Description

driving method and driving device of display device

Technical Field

The present application belongs to the field of display technologies, and in particular, to a driving method and a driving apparatus for a display device.

Background

because a Liquid Crystal Display (LCD) screen has the advantages of energy saving, environmental protection, portability and the like, the LCD screen is widely applied to the field of displays at present, and because a direct type LCD screen has higher contrast and faster response speed, the LCD screen is generally accepted in the market.

However, the direct-type LCD screen has a disadvantage of a relatively serious color shift phenomenon at a large viewing angle, and the disadvantage is inherent in the design of the direct-type LCD screen, that is, the color shift phenomenon at a large viewing angle caused by the design structure of the direct-type LCD screen cannot be completely eliminated.

Disclosure of Invention

In view of the above, embodiments of the present disclosure provide a driving method and a driving apparatus for a display device to improve the color shift phenomenon of the current display device under a large viewing angle.

The embodiment of the application provides a driving method of a display device, which comprises the following steps:

Obtaining chromaticity coordinates of sub-pixels corresponding to each pixel unit in a preset area in an RGB color gamut space;

Respectively calculating data characteristic values of a plurality of chromaticity coordinates of each sub-pixel in the preset area in the RGB color gamut space according to the chromaticity coordinates of the sub-pixels in the RGB color gamut space;

Converting the data characteristic value of the chromaticity coordinate of the sub-pixel in the RGB color gamut space into the chromaticity coordinate in the LCH color gamut space;

If the saturation and hue in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, respectively adjusting the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel in the sub-pixels in the preset region according to the third preset condition, so that the gamma value of the adjusted green sub-pixel is greater than the gamma value of the green sub-pixel before adjustment, and the gamma value of the adjusted blue sub-pixel is greater than the gamma value of the blue sub-pixel before adjustment.

An embodiment of the present application further provides a driving apparatus for a display apparatus, including:

The acquisition module is used for acquiring the chromaticity coordinates of the sub-pixels corresponding to each pixel unit in the preset area in the RGB color gamut space;

The data characteristic value calculating module is used for respectively calculating the data characteristic values of a plurality of chromaticity coordinates of each sub-pixel in the preset area in the RGB color gamut space according to the chromaticity coordinates of the sub-pixels in the RGB color gamut space;

the conversion module is used for converting the data characteristic value of the chromaticity coordinate of the sub-pixel in the RGB color gamut space into the chromaticity coordinate in the LCH color gamut space;

and the processing module is used for respectively adjusting the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel in the sub-pixels in the preset area according to a third preset condition if C and H in the chromaticity coordinate in the LCH color gamut space meet the third preset condition, so that the gamma value of the green sub-pixel after adjustment is larger than the gamma value of the green sub-pixel before adjustment, and the gamma value of the blue sub-pixel after adjustment is larger than the gamma value of the blue sub-pixel before adjustment.

The embodiment of the application also provides a driving method of the display device, which comprises the following steps:

If the saturation and the hue in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, respectively adjusting the gamma value of a green sub-pixel and the gamma value of a blue sub-pixel in the sub-pixels in the preset region according to the third preset condition, so that the gamma value of the adjusted green sub-pixel is greater than the gamma value of the green sub-pixel before adjustment, and the gamma value of the adjusted blue sub-pixel is greater than the gamma value of the blue sub-pixel before adjustment;

Taking the gamma value of the green sub-pixel before adjustment as the initial gamma value of the green sub-pixel, taking the gamma value of the green sub-pixel after adjustment as the target gamma value of the green sub-pixel, taking the gamma value of the blue sub-pixel before adjustment as the initial gamma value of the blue sub-pixel, and taking the gamma value of the blue sub-pixel after adjustment as the target gamma value of the blue sub-pixel;

acquiring a brightness value corresponding to an initial gamma value of the green sub-pixel and a brightness value corresponding to a target gamma value of the green sub-pixel;

Calculating according to a brightness value corresponding to the initial gamma value of the green sub-pixel and a brightness value corresponding to the target gamma value of the green sub-pixel to obtain a backlight target brightness signal value of the green sub-pixel in the corresponding backlight sub-pixel in the preset area;

Acquiring a brightness value corresponding to an initial gamma value of the blue sub-pixel and a brightness value corresponding to a target gamma value of the blue sub-pixel;

Calculating to obtain a backlight target brightness signal value of a blue sub-pixel in a corresponding back sub-pixel in the preset region according to a brightness value corresponding to the initial gamma value of the blue sub-pixel and a brightness value corresponding to the target gamma value of the blue sub-pixel;

If the saturation and hue in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, respectively adjusting the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel in the sub-pixels in the preset region according to the third preset condition includes:

If H is within the range of 345 deg., 360 deg]And C ∈ [ C ∈ >_TL1，C_TH1]Then γ' G ═ γ G₁，γ'B＝γB₁；

If H e (330 deg., 345 deg. °)]And C ∈ [ C ∈ >_TL2，C_TH2]then γ' G ═ γ G₂，γ'B＝γB₂；

If H e (315 deg., 330 deg. °)]And C ∈ [ C ∈ >_TL3，C_TH3]Then γ' G ═ γ G₃，γ'B＝γB₃；

if H is within the range of 0 DEG, 15 DEG]and C ∈ [ C ∈ >_TL4，C_TH4]Then γ' G ═ γ G₄，γ'B＝γB₄；

If H is within the range of 15 DEG, 30 DEG]And C ∈ [ C ∈ >_TL5，C_TH5]Then γ' G ═ γ G₅，γ'B＝γB₅；

If H is within the range of 30 DEG, 45 DEG]And C ∈ [ C ∈ >_TL6，C_TH6]when γ' G is equal to γ G₆，γ'B＝γB₆；

The H represents the hue of the preset area in the LCH color gamut space; c represents the saturation of the preset area in the LCH color gamut space, and C is more than or equal to 0_TLi＜100，0＜C_THi≤100，C_THi≥C_TLii is 1,2,3,4,5, 6; the gamma 'G represents the gamma value of the adjusted green sub-pixel, and the gamma' B represents the gamma value of the adjusted blue sub-pixel.

An embodiment of the present application further provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method provided in the first aspect of the embodiment of the present application when executing the computer program.

Embodiments of the present application further provide a computer-readable storage medium, which stores a computer program, and the computer program, when executed by one or more processors, implements the steps of the method provided in the first aspect of the embodiments of the present application.

In the embodiment of the application, chromaticity coordinates of sub-pixels (a red sub-pixel, a green sub-pixel, a blue sub-pixel, or R, G, B) corresponding to each pixel unit in a preset area in an RGB color gamut space are obtained first, the chromaticity coordinates in the RGB color gamut space can be represented by gray scales, and since each pixel unit has a gray scale value of a red sub-pixel, a gray scale value of a green sub-pixel, and a gray scale value of a blue sub-pixel, data characteristic values of a plurality of gray scale values corresponding to each sub-pixel are respectively calculated according to the obtained gray scale of the sub-pixel of each pixel unit, and the data characteristic values of the gray scales of the sub-pixels are converted into the chromaticity coordinates in an LCH color gamut space; if the saturation and the hue in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, where the third preset condition is a range value of the saturation and the hue when the color shift phenomenon is severe under a large viewing angle, the input gamma signals of the green sub-pixel and the blue sub-pixel in the sub-pixel are increased, so that after the gamma values of the green sub-pixel and the blue sub-pixel are increased, the luminance ratio of the green sub-pixel and the blue sub-pixel under the large viewing angle is decreased relative to the red sub-pixel, and the red sub-pixel is more vivid relative to the adjusted green sub-pixel and blue sub-pixel, thereby improving the color shift phenomenon under the large viewing angle.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a diagram of the large viewing angle and front view perspective changes of various representative color systems of an LCD;

Fig. 2 is a schematic flow chart illustrating an implementation of a driving method of a display device according to an embodiment of the present application;

Fig. 3 is a schematic flow chart illustrating an implementation of a driving method of a display device according to another embodiment of the present application;

FIG. 4 is a view angle color difference variation of a 60 ° horizontal view angle under different red color mixing conditions;

Fig. 5 is a schematic flow chart illustrating an implementation of a driving method of a display device according to another embodiment of the present application;

Fig. 6 is a schematic flow chart illustrating an implementation of a driving method of a display device according to another embodiment of the present application;

Fig. 7 is a schematic flow chart illustrating an implementation of a driving method of a display device according to another embodiment of the present application;

FIG. 8 is a CIE LCH color gamut space system;

Fig. 9 is a schematic flow chart illustrating an implementation of a driving method of a display device according to another embodiment of the present application;

Fig. 10 is a schematic block diagram of a driving apparatus of a display apparatus according to an embodiment of the present application;

Fig. 11 is a schematic block diagram of a terminal device according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

for the sake of convenience in the following description, we will refer to the red sub-pixel as R, the green sub-pixel as G, the blue sub-pixel as B, the saturation in the LCH gamut space as C, and the hue as H.

fig. 1 shows the change of large viewing angle and front view character shift of various representative color systems of a liquid crystal display, and it is found from fig. 1 that the color shift phenomenon is more serious in the large viewing angle of the color systems with red, green and blue hues than in other color systems, so that the whole color shift phenomenon in the large viewing angle can be improved by solving the color shift defect of R, G, B hues in the display.

The lcd panel is composed of a plurality of pixel units, each of which represents an image signal, wherein each of the pixel units is composed of three liquid crystal cells, and red (R), green (G), and blue (B) filters are respectively disposed under each of the three liquid crystal cells (or sub-pixels R, G, B are directly used as backlight sources), so that light passing through different cells can display different colors on a screen. Three cells in each pixel unit have independent driving signals, and the proportion of a plurality of sub-pixels can be adjusted through the independent driving signals, so that each pixel unit can present different colors.

in order to explain the technical solution described in the present application, the following description will be given by way of specific examples.

Fig. 2 is a schematic implementation flow diagram of a driving method of a display device according to an embodiment of the present application, where the method may include the following steps:

In step S201, a gray scale of a sub-pixel corresponding to each pixel unit in a preset region is obtained.

In one embodiment, since the lcd panel is composed of a plurality of pixel units, if the color shift efficiency of each pixel unit is adjusted individually, the lcd panel can be divided into a plurality of partitions, each partition is composed of a plurality of pixel units, and the size of the partition can be set according to the actual situation. For example, the display is divided into a plurality of partitions (L rows, H columns), each of which can be regarded as a small area, and then the display is equivalently composed of L × H small areas. One small area is selected as a preset area, the small area is located in the Nth row and the Mth column, and the value range of N is as follows: n is more than or equal to 1 and less than or equal to L, and the value range of M is as follows: m is more than or equal to 1 and less than or equal to H. That is, if the display panel of the display is divided into 5 rows and 8 columns, then L is 5 and H is 8, then the preset area is represented by (N, M), and the value range of N is: n is more than or equal to 1 and less than or equal to 5, and the value range of M is as follows: m is more than or equal to 1 and less than or equal to 8, and N and M both represent integers. Assuming that the default region selected by us is row 3, column 6, the default region (N, M) can be represented by (3, 6). Of course, different ways of representing the preset region may also be evolved from the above. If one of the partitions can be composed of i columns and j rows of pixel units, and then the partition has i × j pixel units, we will explain the method of the embodiment of the present application by taking the example of adjusting the color shift in one partition.

The preset area is one of the partitions, the interior of the partition is provided with a plurality of pixel units, each pixel unit is composed of three sub-pixels (R, G, B), each sub-pixel has a corresponding chromaticity coordinate in an RGB color gamut space, for example, a chromaticity coordinate of a gray scale value used in the RGB color gamut space, the gray scale represents a gradation level with different brightness from the darkest to the brightest, can represent 256 brightness gradations, and can be specifically represented by a numerical value of 0-255. First, we obtain the gray-scale value corresponding to each sub-pixel in each pixel unit.

Step S202, respectively calculating the data characteristic values of a plurality of gray scales corresponding to each sub-pixel in the preset area according to the gray scales of the sub-pixels.

In one embodiment, after obtaining the chromaticity coordinates (gray-scale values) of each sub-pixel in each pixel unit in the RGB color gamut space, we can obtain the gray-scale values of each sub-pixel (e.g., the sub-pixel corresponding to the red color phase) in each pixel unit, so that each sub-pixel obtains i × j gray-scale values. The data characteristic value is a value that can be used to characterize a set of data or that can characterize an analysis of data. In one embodiment, the average value may be used as the data characteristic value of a set of data, that is, the average value of the plurality of gray levels corresponding to each sub-pixel is obtained, and the average value may include an arithmetic average, an additive average, and a geometric average. It should be noted that the data feature value may also include a variance, an arithmetic mean after removing abnormal gray-scale data, or the like, which is not limited herein.

Step S203, if the data characteristic values of the plurality of gray scales corresponding to each sub-pixel in the preset region meet a first preset condition, respectively adjusting the gamma value of G and the gamma value of B in the sub-pixel in the preset region according to the first preset condition, so that the gamma value of G after adjustment is greater than the gamma value of G before adjustment, and the gamma value of B after adjustment is greater than the gamma value of B before adjustment.

in one embodiment, the first predetermined condition is that the color shift phenomenon is severe when the data characteristic value of the gray scale corresponding to each sub-pixel is under the condition. Therefore, when the color cast phenomenon is serious, the color cast phenomenon of the liquid crystal display panel under a large visual angle can be improved by adjusting various parameters of the sub-pixels. For example, the input gamma signal of the sub-pixel is adjusted, the input gamma signal is specifically represented by a gamma value, the gamma value is actually a relation value between the output and the input, and the input gamma value can be obtained by the formula output ═ input^γInput represents an input signal, output represents an output signal, and gamma value γ is a power exponent and is also referred to as a gamma coefficient. By adjusting the gamma value, the output signal can be changed without changing the input signal, or the input signal can be equivalently adjusted by changing the gamma value without changing the input signal. In popular terms, without changing the video source data received by the display, the gamma value is adjusted to change the image of the video presented to the user, or the image of the video seen by the user is changed, and the changes are expressed in brightness, color and the like.

In order to further obtain the parameters of the sub-pixels that need to be adjusted, the gray scale relationship of R, G, B under the large viewing angle and the large viewing angle is compared, taking the mixed color gray scale of the front viewing angle (0 °) as R160, G50 and B50 as an example, the ratio of the mixed color gray scale of the front viewing angle RX, GY and BZ to the full gray scale R255, G255 and B255 is 37%, 3% and 3% respectively, and the ratio of the mixed color of the front viewing angle RX, GY and BZ to the full gray scale R255, G255 and B255 under the large viewing angle (60 °) is 54%, 23% and 28% respectively, so that the mixed color of the front viewing angle and the mixed color of the large viewing angle RX, GY and BZ is completely different, that is, the same gray scale value (input parameter signal) is larger than the luminance ratio between the R, G, R and B shown under the front viewing angle, that is, the ratio of the blue hue and the green hue under the large viewing angle is not negligible, which causes the red hue under the large viewing angle to be less obvious than the, thus, color shift occurs at large viewing angles. It should be noted that this example is merely an example, and in practice, the color shift phenomenon may not be the same in different viewing angles and different color mixing conditions.

According to the comparison, the gamma values of G and B are adjusted, so that the equivalent gray scales of G and B after the gamma values of G and B are adjusted become smaller, and the equivalent gray scales of G and B are smaller than the gray scale of R under a large viewing angle. The red hue can be revealed again. Making the equivalent gray levels of G and B smaller requires the gamma values of G and B to be adjusted larger. Since output is input^γIt is assumed that the input signal is a gray level value, and the presented gray level is changed after the gamma value is changed, and the presented gray level is equivalent to an equivalent gray level.

According to the embodiment of the application, through acquiring the data characteristic values of the plurality of gray scales corresponding to the sub-pixels, if the data characteristic values of the plurality of gray scales corresponding to the sub-pixels can show the color cast phenomenon under a large viewing angle, the gamma values of G and B are adjusted to be large, after the gamma values are adjusted to be large, the equivalent gray scales of G and B become small, the difference between the equivalent gray scales of G and B and the data characteristic values of the gray scales of R becomes large, so that the color of R looks brighter, and the color cast phenomenon under the large viewing angle can be obviously improved.

fig. 3 is a schematic implementation flow diagram of a driving method of a display device according to another embodiment of the present application, and as shown in the figure, after step S203, the method may further include the following steps:

in step S301, the gamma value of G before adjustment is used as the initial gamma value of G, the gamma value of G after adjustment is used as the target gamma value of G, the gamma value of B before adjustment is used as the initial gamma value of B, and the gamma value of B after adjustment is used as the target gamma value of B.

In one embodiment, in order to distinguish between the value before the gamma value of G is adjusted and the value after the gamma value of G is adjusted, the gamma value of G before the adjustment is used as the initial gamma value of G, the gamma value of G after the adjustment is used as the target gamma value of G, the gamma value of B before the adjustment is used as the initial gamma value of B, and the gamma value of B after the adjustment is used as the target gamma value of B.

Step S302, obtaining a brightness value corresponding to the initial gamma value of G and a brightness value corresponding to the target gamma value of G.

In one embodiment, although the color shift phenomenon at a large viewing angle is improved by adjusting the gamma values of G and B, since the brightness has a corresponding effect after adjusting the gamma values, the brightness of G and B changes at a normal viewing angle, so that the colors of G and B change at the normal viewing angle, and the colors combined by the sub-pixels R, G, B also change, so we need to obtain the brightness value corresponding to the initial gamma value of G and the brightness value corresponding to the target gamma value of G, and check how much the brightness changes, so as to recover the brightness value at the normal viewing angle, and the performance of the original color will not be affected by adjusting the gamma value of G.

as another embodiment of the present application, we can obtain the brightness value corresponding to the initial gamma value of G and the brightness value corresponding to the target gamma value of G in the following manner.

the brightness value corresponding to the initial gamma value of G is obtained by the following formula:

the brightness value corresponding to the target gamma value of G is obtained through the following formula:

Said L_N,MG represents a brightness value corresponding to the initial gamma value of G, L'_N,Mg represents a brightness value corresponding to the target gamma value of G; LG (255) represents a luminance value when the gray level of G is 255, G_Grepresenting the data characteristic value of the gray scale of G in each pixel unit in a preset area; gamma G represents an initial gamma value of G, and gamma' G represents a target gamma value of G;

in one embodiment, G is greater than the initial gamma value of G due to the target gamma value of G_GIs a value of not more than 255, so L'_N,MG relative to L_N,MG is actuallyit is darkened, that is, after the gamma value of G is increased, the brightness of G is darkened. It should be noted that, the above is only one way of acquiring the brightness value corresponding to the initial gamma value of G and the brightness value corresponding to the target gamma value of G, and in practical applications, the above may also be acquired according to other ways.

Step S303, calculating to obtain a backlight target brightness signal value of G in the corresponding backlight sub-pixel in the preset region according to the brightness value corresponding to the initial gamma value of G and the brightness value corresponding to the target gamma value of G.

in one embodiment, the brightness is presented by the input brightness signal, and the change of the brightness value needs to be realized by adjusting the value of the brightness signal. Therefore, a backlight target brightness signal value can be obtained through calculation according to the brightness value corresponding to the initial gamma value of G, the brightness value corresponding to the target gamma value of G and the current backlight brightness signal value, and the backlight target brightness signal value can enable the brightness presented by G in the front view angle to be restored to the brightness presented by the gamma value of G before being adjusted.

in one embodiment, the obtaining, according to the calculation of the brightness value corresponding to the initial gamma value of G and the brightness value corresponding to the target gamma value of G, the backlight target brightness signal value of G in the corresponding backlight sub-pixel in the preset region includes:

by the formulaCalculating a backlight target brightness signal value of a green sub-pixel in the corresponding backlight sub-pixels in the preset area;

a'_N,MG represents the backlight target brightness signal value corresponding to G in the backlight sub-pixel in the preset area, A_N,MG represents the current backlight brightness signal value of G in the corresponding backlight sub-pixel in the preset area; said L_N,MG represents a brightness value corresponding to an initial gamma value of G in the sub-pixels in the preset region, and L'_N,MG represents the brightness value corresponding to the target gamma value of G in the three sub-pixels in the preset area, and N and M respectively represent the brightness values of the preset area in the divided multiple areasthe number of rows and columns.

If the brightness value corresponding to the initial gamma value of G and the brightness value corresponding to the target gamma value of G are obtained in step S302, the backlight target brightness signal value of G is obtained by the following formula:

Step S304, obtaining a brightness value corresponding to the initial gamma value of B and a brightness value corresponding to the target gamma value of B.

This step is similar to that in step S302 except that step S302 obtains a brightness value corresponding to an initial gamma value of G and a brightness value corresponding to a target gamma value of G, and that step S302 obtains a brightness value corresponding to an initial gamma value of B and a brightness value corresponding to a target gamma value of B. The calculation method is the same, and is not described herein again.

As another embodiment, the obtaining the brightness value corresponding to the initial gamma value of B and the brightness value corresponding to the target gamma value of B includes:

The brightness value corresponding to the initial gamma value of B is obtained by the following formula:

the brightness value corresponding to the target gamma value of B is obtained through the following formula:

Said L_N,MB represents a brightness value corresponding to the initial gamma value of B, L'_N,Mb represents a brightness value corresponding to the target gamma value of B; the LB (255) represents a luminance value g when the gray scale of B is 255_BRepresenting the data characteristic value of the gray scale of B in each pixel unit in a preset area; γ B represents the initial gamma value of B, and γ' B represents the target gamma value of B.

step S305, obtaining a backlight target brightness signal value of B in the corresponding backlight sub-pixel in the preset region according to the brightness value corresponding to the initial gamma value of B and the brightness value corresponding to the target gamma value of B.

This step is similar to that in step S303 except that in step S303, the backlight target luminance signal value of G is calculated, and in step S303, the backlight target luminance signal value of B is calculated. And will not be described in detail herein.

As another embodiment of the present application, the obtaining, according to the calculation of the brightness value corresponding to the initial gamma value of B and the brightness value corresponding to the target gamma value of B, the target brightness signal value of B in the corresponding backlight sub-pixel in the preset region includes:

By the formulaCalculating a backlight target brightness signal value of a blue sub-pixel in a corresponding back sub-pixel in the preset region;

A'_N,Mb represents the backlight target brightness signal value corresponding to B in the backlight sub-pixel in the preset area, A_N,MB represents the current backlight brightness signal value of B in the corresponding backlight sub-pixel in the preset area, and L is_N,MB represents a brightness value corresponding to an initial gamma value of B in the sub-pixels in the preset region, and L'_N,MB represents a brightness value corresponding to a target gamma value of B in the sub-pixels in the preset area, and N and M respectively represent the number of rows and columns of the preset area in the divided areas.

Similarly, the backlight target brightness signal value of B is obtained by the following formula:

In the embodiment of the application, R, G, B are driven independently because of their own drive. According to the process of calculating the backlight target brightness signal value of G, the backlight target brightness signal value of B can be obtained by correspondingly replacing various parameters of G with various parameters of B. Specifically, it is not limited to calculate the backlight target luminance signal value of G first or calculate the backlight target luminance signal value of B first, and the backlight target luminance signal value of G and the backlight target luminance signal value of B may be calculated at the same time.

Fig. 4 shows the variation of the viewing angle color difference under different color mixing conditions of red color system with a horizontal viewing angle of 60 degrees, the abscissa represents the gray levels of G and B, and the ordinate represents the color shift, as shown in the figure, when the R (red) gray level is 255, the G (green) gray level and the B (blue) gray level are between 0 and 255, and the color shift of the R hue is more serious as the signal of the G, B gray level is reduced. When the gray level of red is 200, the gray level of G, B is between 0-180 gray levels, and the lower the gray level signal of G, B is, the more serious the color shift of the red hue is. When the gray level of red is 160, the gray level of G, B is between 0-160, and the lower the gray level signal of G, B, the more serious the color shift of the red hue. When the gray level of the red color is 100, the gray level of G, B is between 0-100 gray levels, and the lower the gray level signal of G, B is, the more serious the color shift of the red color phase is.

Fig. 4 shows that when the red color shift is severe, the ranges of the gray scales of the sub-pixels are respectively located, and the ranges are used as a first preset condition, that is, when the data characteristic values of the gray scales corresponding to each sub-pixel meet the first preset condition, the color shift phenomenon is severe under a large viewing angle, and fig. 4 also shows that when the gray scale of R is fixed, the gray scales of G and B are small to a certain degree, at this time, R is relatively more vivid, and the color shift is relatively small (using the leftmost part of each curve in fig. 4). Therefore, we can improve the color shift phenomenon at large viewing angles by adjusting the gamma value of G and the gamma value of B in the sub-pixels.

As another embodiment of the present application, if the data characteristic values of the plurality of gray scales corresponding to each sub-pixel in the preset region meet a first preset condition, respectively adjusting the gamma value of G and the gamma value of B in the three sub-pixels in the preset region according to the first preset condition includes:

If g is_R∈(200,255]And g is_G∈[0，200]And g is_B∈[0，200]Then γ' G ═ γ G₁，γ'B＝γB₁；

If g is_R∈(150,200]And g is_G∈[0，180]And g is_B∈[0，180]Then γ' G ═γG₂，γ'B＝γB₂；

If g is_R∈(100,150]And g is_G∈[0，150]And g is_B∈[0，150]Then γ' G ═ γ G₃，γ'B＝γB₃；

if g is_R∈(50,100]And g is_G∈[0，100]And g is_B∈[0，100]Then γ' G ═ γ G₄，γ'B＝γB₄；

If g is_R∈[0,50]And g is_G∈[0，50]and g is_B∈[0，50]Then γ' G ═ γ G₅，γ'B＝γB₅；

Said g is_RRepresenting data characteristic values of a plurality of gray scales of R in a preset region; said g is_GData characteristic value representing multiple gray levels of G in preset region_BAnd the gamma 'G represents the gamma value of the adjusted G, and the gamma' B represents the gamma value of the adjusted B. The values of gamma 'G and gamma' B are different according to different preset conditions, and gamma G₁、γG₂… … represent different gamma values.

in practical application, different preset conditions may be set according to the gray scale range of the sub-pixel when the color cast is severe under a large viewing angle, different target gamma values are set corresponding to the different preset conditions, each corresponding target gamma value is not only required to be greater than the initial gamma value, but is determined according to the gray scale value of R, G, B in the preset conditions, of course, the target gamma value may also be an empirical value, and after the target gamma value is adjusted, the color cast phenomenon may be improved, and the degree of improving the color cast phenomenon may be different by setting different target gamma values.

according to the embodiment of the application, a plurality of first preset conditions are set by comparing color cast conditions under different color mixing conditions of a red system under a positive visual angle and a large visual angle, and a target gamma value is set for each first preset condition, so that the color cast phenomenon under the large visual angle can be improved by adjusting the gamma values of G and B according to the first preset conditions as long as the data characteristic value of the gray value of the sub-pixel meets the first preset condition as long as the first preset condition basically covers the range of the gray value of the sub-pixel under the condition of serious color cast phenomenon.

fig. 5 is a schematic flow chart illustrating an implementation of a driving method of a display device according to an embodiment of the present application, which is different from the embodiment shown in fig. 2 in that: the gamma value of R is adjusted in this embodiment, and the gamma values of G and B are adjusted in the embodiment shown in FIG. 2, and the method can include the following steps as shown in the figure:

Step S501, obtaining a gray scale of a sub-pixel corresponding to each pixel unit in a preset region.

Step S502, respectively calculating the data characteristic values of a plurality of gray scales corresponding to each sub-pixel in the preset area according to the gray scales of the sub-pixels.

Step S503, if the data characteristic values of the plurality of gray scales corresponding to each sub-pixel in the preset region meet a second preset condition, adjusting the gamma value of R in the sub-pixel in the preset region according to the second preset condition, so that the gamma value of R after adjustment is greater than the gamma value of R before adjustment, the equivalent gray scale of R after adjustment is greater than the data characteristic value of the gray scale of G, and the equivalent gray scale of R after adjustment is greater than the data characteristic value of the gray scale of B.

To obtain the parameters to be adjusted from another aspect, we continue to use fig. 4 to describe the variation of the viewing angle color difference under different color mixing conditions of the red color system at the horizontal viewing angle of 60 °, as shown in fig. 4, when the same red hue (the same red gray scale) corresponds to the same G, B gray scale signal, the lower the color mixing R signal (the gray scale of the red hue), the smaller the color difference (color shift) can be found, for example, when R is a 200 gray scale signal, the color difference of G, B color mixing gray scale signal is 0.015 gray scale, when R is a 160 gray scale signal, the color difference of G, B color mixing gray scale signal is 0.01 gray scale, when R is a 100 gray scale signal, the color difference of G, B color mixing gray scale signal is 0.003 gray scale. Therefore, the embodiment of the present application can reduce the R gray scale signal (reduce the gray scale value) to make the Red gray scale signal approach G, B color mixture gray scale signal, that is, the gray scale value of R is reduced to a gray scale value approaching G, B, and it can be seen from the figure that when the gray scale signal of R, G, B is approaching (using the rightmost part of each curve in fig. 4), for example, both are 200, or R is 200 and G, B is approaching 200, the color shift phenomenon is very small, because the overall color is shifted to the neutral black-and-white gray scale color, so the color shift phenomenon at a large viewing angle can be improved. However, the equivalent gray scale of R cannot be decreased without limit, and the equivalent gray scale of R still needs to be larger than the data characteristic of the gray scale of G and larger than the data characteristic value of the gray scale of B, because it can be seen from the figure that the gray scale of R must be larger than the gray scales of G and B to improve the color shift imagination. Therefore, when the gamma value of R is increased, the equivalent gray scale of R is decreased, but the adjusted equivalent gray scale of R is greater than the data characteristic of the gray scale of G, and the adjusted equivalent gray scale of R is greater than the data characteristic of the gray scale of G.

According to the embodiment of the application, by acquiring the data characteristic values of the plurality of gray scales corresponding to the sub-pixels, if the data characteristic values of the plurality of gray scales corresponding to the sub-pixels show color cast under a large viewing angle, the gamma value of R is increased, and after the gamma value is increased, the brightness or the equivalent gray scale of R is decreased, when the equivalent gray scale of R is close to G and B, neutral color is also shown, and the whole color cast phenomenon is improved.

As another embodiment of the present application, after step S503, if the adjusted gamma value is R, as shown in fig. 6, the method further includes:

In step S601, the gamma value of R before adjustment is used as the initial gamma value of R, and the gamma value of R after adjustment is used as the target gamma value of R.

Step S602, obtaining a brightness value corresponding to the initial gamma value of R and a brightness value corresponding to the target gamma value of R.

step S603, calculating to obtain a backlight target brightness signal value of R in the corresponding backlight sub-pixel in the preset region according to the brightness value corresponding to the initial gamma value of R and the brightness value corresponding to the target gamma value of R.

This step is similar to steps S301-S303 except that steps S301-S303 are angle descriptions of G and steps S301-S303 are angle descriptions of R. The content is the same as the calculation method, only G is replaced by R, and details are not repeated here.

in an embodiment, although the color shift phenomenon at a large viewing angle is improved by adjusting the gamma value of R, since the brightness also has a corresponding effect after adjusting the gamma value, the brightness of R changes at a front viewing angle, so that the color of R changes at the front viewing angle, and the color combined together through R, G, B also changes, so we need to obtain the brightness value corresponding to the initial gamma value of R and the brightness value corresponding to the target gamma value of R, and check how much the brightness changes, so as to recover the brightness value at the front viewing angle, and the performance of the original color will not be affected by adjusting the gamma value of R.

We can obtain the brightness value corresponding to the initial gamma value of R and the brightness value corresponding to the target gamma value of R in the following manner.

The brightness value corresponding to the initial gamma value of R is obtained by the following formula:

the brightness value corresponding to the target gamma value of R is obtained through the following formula:

said L_N,MR represents a brightness value corresponding to the initial gamma value of R, L'_N,Mr represents a brightness value corresponding to a target gamma value of R; LR (255) represents a luminance value when the gray level of R is 255, g_Rrepresenting the data characteristic value of the gray scale of R in each pixel unit in a preset area; γ R represents the initial gamma value of R, and γ' R represents the target gamma value of R.

In one embodiment, g is greater than the initial gamma value of R because the target gamma value of R is greater than the initial gamma value of R_Ris a value of not more than 255, so L'_N,Mr relative to L_N,MR is actually darkened, namely, the brightness of R is darkened after the gamma value of R is increased. It should be noted that, the above is only one way of acquiring the brightness value corresponding to the initial gamma value of R and the brightness value corresponding to the target gamma value of R, and in practical applications, the above may also be acquired according to other ways.

In one embodiment, we can calculate and obtain a backlight target brightness signal value according to a brightness value corresponding to an initial gamma value of R and a brightness value corresponding to a target gamma value of R and a current brightness signal value, and the backlight target brightness signal value can make the brightness presented by R restore to the brightness presented by adjusting the gamma value of R.

the backlight target brightness signal value of the R in the corresponding backlight sub-pixel in the preset region obtained by calculating according to the brightness value corresponding to the initial gamma value of the R and the brightness value corresponding to the target gamma value of the R is:

By the formulaCalculating a backlight target brightness signal value of a red sub-pixel in the corresponding backlight sub-pixels in the preset area;

A'_N,MR represents the backlight target brightness signal value of R in the corresponding backlight sub-pixel in the preset area, A_N,Mr represents the current backlight brightness signal value of R in the corresponding backlight sub-pixel in the preset area; said L_N,MR represents a brightness value corresponding to an initial gamma value of R in the sub-pixels in the preset region, and L'_N,MAnd the N and M respectively represent the number of rows and the number of columns of the preset region in the divided multiple regions.

the backlight target brightness signal value of R is obtained by the following formula:

As another embodiment of the present application, if the data characteristic values of the plurality of gray scales corresponding to each sub-pixel in the preset region meet a second preset condition, adjusting the gamma value of R in the sub-pixel in the preset region according to the second preset condition includes:

If g is_R∈(200,255]and g is_G∈[0，200]And g is_B∈[0，200]Then γ' R ═ γ R₁and is and

If g is_R∈(150,200]And g is_G∈[0，180]And g is_B∈[0，180]then γ' R ═ γ R₂And is and

if g is_R∈(100,150]and g is_G∈[0，150]And g is_B∈[0，150]Then γ' R ═ γ R₃and is and

If g is_R∈(50,100]And g is_G∈[0，100]And g is_B∈[0，100]Then γ' R ═ γ R₄And is and

if g is_R∈[0,50]And g is_G∈[0，50]And g is_B∈[0，50]Then γ' R ═ γ R₅And is and

Said g is_RRepresenting data characteristic values of a plurality of gray scales of R in a preset region; said g is_Gdata characteristic value representing multiple gray levels of G in preset region_Bdata characteristic values representing a plurality of gray levels of B within a preset region, wherein gamma' R represents an adjusted gamma value of R,The equivalent gray scale of R after adjustment to the target gamma value is represented, i is 1,2,3,4, 5.

we obtain the second preset condition of the gray level of R, G, B when the color shift phenomenon is severe by further analyzing fig. 4. As shown in the figure, when the R (red) gray scale is 255, the G (green) and B (blue) gray scales are between 0 and 255, and the color shift of the R hue is more serious as the G, B gray scale signal is reduced. When the gray level of red is 200, the gray level of G, B is between 0-180 gray levels, and the lower the gray level signal of G, B is, the more serious the color shift of the red hue is. When the gray level of red is 160, the gray level of G, B is between 0-160, and the lower the gray level signal of G, B, the more serious the color shift of the red hue. When the gray level of the red color is 100, the gray level of G, B is between 0-100 gray levels, and the lower the gray level signal of G, B is, the more serious the color shift of the red color phase is.

Through fig. 4, we can find out the range where the gray levels of the sub-pixels are respectively located when the red color shift is severe, and use the range as a second preset condition, that is, when the data characteristic values of the plurality of gray levels corresponding to each sub-pixel meet the second preset condition, it indicates that the color shift phenomenon is severe under the large viewing angle, and we can improve the color shift phenomenon under the large viewing angle by adjusting the gamma value of R in the sub-pixel.

According to the embodiment of the application, a plurality of second preset conditions are set by comparing the color cast conditions under different color mixing conditions of red color systems under a positive visual angle and a large visual angle, and a target gamma value is set for each second preset condition.

Fig. 7 is a schematic implementation flow chart of a driving method of a display device according to an embodiment of the present application, where the method may include the following steps:

Step S701, obtaining chromaticity coordinates of the sub-pixels corresponding to each pixel unit in the preset region in the RGB color gamut space.

step S702, respectively calculating data characteristic values of a plurality of chromaticity coordinates of each sub-pixel in the preset region in the RGB color gamut space according to the chromaticity coordinates of the sub-pixel in the RGB color gamut space.

Step S703 is to convert the data characteristic value of the chromaticity coordinate of the sub-pixel in the RGB color gamut space into the chromaticity coordinate in the LCH color gamut space.

Step S704, if C and H in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, respectively adjusting the gamma value of G and the gamma value of B in the sub-pixel in the preset region according to the third preset condition, so that the gamma value of G after adjustment is greater than the gamma value of G before adjustment, and the gamma value of B after adjustment is greater than the gamma value of B before adjustment.

in one embodiment, the RGB gamut space is most commonly used in computer graphics because color displays use RGB to produce the desired colors. Therefore, the selection of the RGB color gamut space simplifies the construction and design of the system. Also, since the RGB gamut space has been used for many years, most existing software program modules can be utilized. However, the RGB gamut space is not very efficient in processing "real" images. All R, G, B must have the same bandwidth to produce any color within the RGB color cube. This directly results in each R, G, B requiring a frame memory with the same pixel depth and display resolution. Moreover, processing an image in the RGB gamut space is also not generally the most efficient way. For example, to change the luminance or chrominance of a pixel, we must read all RGB color values from the frame buffer, calculate the luminance or chrominance, then make corresponding changes to them, calculate the new RGB values, and write them back to the frame buffer. Some processing steps are faster if the system accesses images that are stored directly in luminance and chrominance. For these and other reasons, many video standards use luminance and two color difference signals. Therefore, in order to process "real" images conveniently, in practical applications, other color gamut spaces may be adopted, such as the LCH color gamut space provided in the embodiments of the present application, so we convert the data characteristic values of the chromaticity coordinates of the sub-pixels in the RGB color gamut space into the chromaticity coordinates in the LCH color gamut space.

Fig. 8 is a CIE LCH gamut space system, with chromaticity coordinates in LCH gamut space represented by L, C, H, respectively. L, C, H may be translated by chromaticity coordinates R, G, B in the RGB color gamut space, e.g., L ═ f (R, G, B), C ═ f (R, G, B), and H ═ f (R, G, B). L represents luminance; h represents hue, namely color, and the value range is 0-360 degrees, wherein 0 degrees is defined as red, 90 degrees is defined as yellow, 180 degrees is defined as green, and 270 degrees is defined as blue; c represents the purity or saturation of hue, namely the vividness of color, the value range is 0-100, 100 represents the most vividness of color, and in practical application, C also represents the display of high and low voltage signals on the LCD display screen.

In one embodiment, the third preset condition means that the color shift phenomenon is severe when C and H in chromaticity coordinates in the LCH color gamut space are under the condition. Therefore, when the color cast phenomenon is serious, the color cast phenomenon of the liquid crystal display panel under a large visual angle can be improved by adjusting various parameters of RGB sub-pixels in the display screen. Like the above analysis, we can adjust the gamma values of G and B to make the equivalent gray levels of G and B smaller after adjusting the gamma values of G and B, so that the equivalent gray levels of G and B are smaller than the gray level of R at a large viewing angle. The red hue can be revealed again. Gray scale value variations in the RGB gamut space result in variations in brightness, hue, and vividness in the LCH gamut space.

According to the method, the data characteristic values of the gray scales corresponding to the sub-pixels are obtained, the gray scale values in the RGB color gamut space are converted into the chromaticity coordinates in the LCH color gamut space, the applicable occasions are wider, if the chromaticity coordinates in the LCH color gamut space show the color cast phenomenon under a large visual angle, the gamma values of G and B are adjusted to be large, after the gamma values are adjusted to be large, the equivalent gray scales of G and B become small, the difference between the equivalent gray scales of G and B and the data characteristic values of the gray scales of R becomes large, the color of R looks brighter, and therefore the color cast phenomenon under the large visual angle is obviously improved.

after the gamma values of G and B are adjusted, the backlight target luminance signal value of B and the backlight target luminance signal value of G in the corresponding backlight sub-pixel in the preset region can be calculated and obtained according to the method of the embodiment shown in fig. 3.

Correspondingly, if C and H in the chromaticity coordinates in the LCH color gamut space meet a third preset condition, respectively adjusting the gamma value of G and the gamma value of B in the sub-pixel in the preset region according to the third preset condition includes:

The H represents the hue of the preset area in the LCH color gamut space; c represents the color purity of the preset area in the LCH color gamut space, and C is more than or equal to 0_TLi＜100，0＜C_THi≤100，C_THi≥C_TLii is 1,2,3,4,5, 6; the gamma 'G represents the gamma value of the adjusted G, and the gamma' B represents the gamma value of the adjusted B.

In one embodiment, when the color shift phenomenon is severe, the range where C and H in the LCH color gamut space are located is found, and the range is taken as a third preset condition, that is, when the values of C and H meet the third preset condition or are within the third preset range, it is indicated that the color shift phenomenon is severe under the large viewing angle, and we can improve the color shift phenomenon under the large viewing angle by adjusting the gamma value of G and the gamma value of B in the sub-pixel.

In practical application, different preset conditions can be set according to the ranges of C and H when color cast is serious under a large viewing angle, different target gamma values are set corresponding to the different preset conditions, each corresponding target gamma value is not only larger than the initial gamma value, but also needs to be determined according to the values of C and H in the preset conditions, of course, the target gamma value can also be an empirical value, the color cast phenomenon can be improved after the target gamma value is adjusted, and the degree of the color cast phenomenon can be improved by setting different target gamma values. The embodiment of the application actually utilizes that when the gray scale of R is fixed, the gray scales of G and B are small to a certain degree, then R is relatively more bright, and meanwhile, the color cast imagination is relatively small. We can improve the color shift phenomenon at large viewing angles by increasing the gamma values of G and B.

According to the embodiment of the application, a plurality of third preset conditions are set according to the range of L and C when the color cast phenomenon is serious, and each third preset condition corresponds to different target gamma values, so that the color cast phenomenon under a large visual angle can be improved by adjusting the gamma values of G and B according to the third preset conditions as long as H and C meet the third preset conditions.

Fig. 9 is a schematic implementation flow chart of a driving method of a display device according to an embodiment of the present application, where the method may include the following steps:

Step S901, obtaining chromaticity coordinates of a sub-pixel corresponding to each pixel unit in a preset region in an RGB color gamut space.

Step S902, respectively calculating data characteristic values of a plurality of chromaticity coordinates of each sub-pixel in the preset region in the RGB color gamut space according to the chromaticity coordinates of the sub-pixel in the RGB color gamut space.

Step S903, converting the data characteristic value of the chromaticity coordinate of the sub-pixel in the RGB color gamut space into the chromaticity coordinate in the LCH color gamut space.

step S904, if C and H in the chromaticity coordinate in the LCH color gamut space meet a fourth preset condition, adjusting the gamma value of R in the sub-pixel in the preset region according to the fourth preset condition, so that the gamma value of R after adjustment is greater than the gamma value of R before adjustment, the equivalent gray scale of R after adjustment is greater than the data characteristic value of the gray scale of G, and the equivalent gray scale of R after adjustment is greater than the data characteristic value of the gray scale of B.

In one embodiment, the fourth preset condition means that the color shift phenomenon is severe when C and H in chromaticity coordinates in the LCH color gamut space are under the condition. Therefore, when the color cast phenomenon is serious, the color cast phenomenon of the liquid crystal display panel under a large visual angle can be improved by adjusting various parameters of RGB sub-pixels in the display screen.

After the gamma value of R is adjusted, the backlight target brightness signal value of R in the corresponding backlight sub-pixel in the preset region can be calculated and obtained according to the method of the embodiment shown in fig. 6.

As another embodiment of the present application, if C and H in the chromaticity coordinates in the LCH color gamut space meet a fourth preset condition, adjusting the gamma value of R in the sub-pixel in the preset region according to the fourth preset condition includes:

If H is within the range of 345 deg., 360 deg]And C ∈ [ C ∈ >_TL1，C_TH1]then γ' R ═ γ R₁and is and

If H e (330 deg., 345 deg. °)]And C ∈ [ C ∈ >_TL2，C_TH2]Then γ' R ═ γ R₂and is and

if H e (315 deg., 330 deg. °)]And C ∈ [ C ∈ >_TL3，C_TH3]then γ' R ═ γ R₃and is and

If H is within the range of 0 DEG, 15 DEG]And C ∈ [ C ∈ >_TL4，C_TH4]then γ' R ═ γ R₄And is and

If H is within the range of 15 DEG, 30 DEG]And C ∈ [ C ∈ >_TL5，C_TH5]Then γ' R ═ γ R₅and is and

if H is within the range of 30 DEG, 45 DEG]and C ∈ [ C ∈ >_TL6，C_TH6]Then γ' R ═ γ R₆And is and

The H represents the hue of the preset area in the LCH color gamut space; c represents the saturation of the hue of the preset area in the LCH color gamut space, and C is more than or equal to 0_TLi＜100，0＜C_THi≤100，C_THi≥C_TLiI is 1,2,3,4,5, 6; the gamma' R represents the gamma value of the adjusted R,the equivalent gray scale of R after adjusting the gamma value of R is represented, i is 1,2,3,4, 5.

It should be noted that, in the method for adjusting color shift in the embodiment of the present application, one is to adjust the gamma values of G and B so that the equivalent gray scales of G and B become smaller (when the gray scales of G and B on the leftmost side of each curve in fig. 4 tend to be 0), and the other is to adjust the gamma value of R so that the equivalent gray scale of R becomes smaller (when the equivalent gray scale of R on the rightmost side of each curve in fig. 4 tends to be equal to the gray scales of G and B); therefore, the two cases have different applicable conditions, and the first preset condition and the second preset condition are derived. Meanwhile, due to different application conditions of different color gamut spaces, although the color cast adjustment effect can be realized by adjusting the gamma values of G and B or adjusting the gamma value of R in the LCH color gamut space, the application conditions respectively become the application conditions in the LCH color gamut space, and thus the third preset condition and the fourth preset condition are derived. It should be noted that other applicable conditions may also be derived in the RGB color gamut space according to the curve given in fig. 4, and the gamma value of R, G, B may be adjusted according to different applicable conditions; meanwhile, other applicable conditions may be derived according to the conversion relationship between the other color gamut spaces and the RGB color gamut space, and the gamma value of R, G, B may be adjusted according to different applicable conditions.

it should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

fig. 10 is a schematic block diagram of a driving device of a display device according to an embodiment of the present application, and only a portion related to the embodiment of the present application is shown for convenience of description.

The driving device 10 of the display device may be a software unit, a hardware unit, or a combination of software and hardware unit built in a terminal device (a display, a television, or the like), or may be integrated as a separate pendant into the terminal device.

The driving device 10 of the display device includes:

The obtaining module 101 is configured to obtain chromaticity coordinates of a sub-pixel corresponding to each pixel unit in a preset region in an RGB color gamut space;

The data characteristic value calculating module 102 is configured to calculate, according to the chromaticity coordinates of the sub-pixels in the RGB color gamut space, data characteristic values of a plurality of chromaticity coordinates of each sub-pixel in the preset region in the RGB color gamut space respectively;

the conversion module 103 is configured to convert the data characteristic value of the chromaticity coordinate of the sub-pixel in the RGB color gamut space into the chromaticity coordinate in the LCH color gamut space;

And the processing module 104 is configured to, if C and H in the chromaticity coordinates in the LCH color gamut space meet a third preset condition, respectively adjust the gamma value of G and the gamma value of B in the sub-pixels in the preset region according to the third preset condition, so that the gamma value of G after adjustment is greater than the gamma value of G before adjustment, and the gamma value of B after adjustment is greater than the gamma value of B before adjustment.

Optionally, the method further includes:

A brightness value obtaining module 105 of the green sub-pixel, configured to use a gamma value of G before adjustment as an initial gamma value of G, use a gamma value of G after adjustment as a target gamma value of G, and obtain a brightness value corresponding to the initial gamma value of G and a brightness value corresponding to the target gamma value of G;

A target brightness signal value determining module 106 of the green sub-pixel, configured to calculate, according to a brightness value corresponding to the initial gamma value of G and a brightness value corresponding to the target gamma value of G, a backlight target brightness signal value of G in the corresponding backlight sub-pixel in the preset area;

A brightness value obtaining module 107 of the blue sub-pixel, configured to use a gamma value of B before being adjusted as an initial gamma value of B, use a gamma value of B after being adjusted as a target gamma value of B, and obtain a brightness value corresponding to the initial gamma value of B and a brightness value corresponding to the target gamma value of B;

and a target brightness signal value determination module 108 of the blue sub-pixel, configured to calculate, according to the brightness value corresponding to the initial gamma value of B and the brightness value corresponding to the target gamma value of B, to obtain a backlight target brightness signal value of B in the corresponding backlight sub-pixel in the preset area.

Optionally, the backlight target luminance signal value of the green sub-pixel determining module 106 is configured to:

a'_N,Mg represents the backlight target brightness signal value corresponding to G in the backlight sub-pixel in the preset area, A_N,MG represents the current backlight brightness signal value of G in the corresponding backlight sub-pixel in the preset area; said L_N,MG represents a brightness value corresponding to an initial gamma value of G in the sub-pixels in the preset region, and L'_N,Mg represents a brightness value corresponding to a target gamma value of G in the sub-pixels in the preset area, and N and M respectively represent the number of rows and columns of the preset area in the divided areas;

The target luminance signal value for the blue sub-pixel determination module 108 is configured to:

optionally, the luminance value obtaining module 105 of the green sub-pixel includes:

An initial brightness value obtaining unit 1051 of the green sub-pixel, configured to obtain a brightness value corresponding to the initial gamma value of G by the following formula:

a target brightness value obtaining unit 1052 of the green sub-pixel, configured to obtain a brightness value corresponding to the target gamma value of G by the following formula:

The luminance value obtaining module 107 of the blue sub-pixel includes:

An initial luminance value obtaining unit 1071 of the blue sub-pixel, configured to obtain a luminance value corresponding to the initial gamma value of B by the following formula:

a target luminance value obtaining unit 1072 of the blue sub-pixel, configured to obtain a luminance value corresponding to the target gamma value of B by the following formula:

Optionally, the processing module 104 is configured to:

optionally, the data characteristic value includes: arithmetic mean, addend mean, geometric mean, variance.

it will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing functional modules and units are merely illustrated in terms of division, and in practical applications, the foregoing functional allocation may be performed by different functional modules or units according to needs, that is, the internal structure of the driving device of the display device is divided into different functional modules or units to perform all or part of the above-described functions.

fig. 11 is a schematic block diagram of a terminal device according to an embodiment of the present application. As shown in fig. 11, the terminal device 11 of this embodiment includes: one or more processors 110, a memory 111, and a computer program 112 stored in the memory 111 and executable on the processors 110. The processor 110 executes the computer program 112 to implement the steps in the above-described embodiments of the driving method of each display device, such as the steps S701 to S704 shown in fig. 7. Alternatively, the processor 110 executes the computer program 112 to implement the functions of the modules in the driving device embodiment of the display device, for example, the functions of the modules 101 to 104 shown in fig. 10. If the terminal device is a display, a display panel should be included.

Illustratively, the computer program 112 may be partitioned into one or more modules/units that are stored in the memory 111 and executed by the processor 110 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program 112 in the terminal device 11. For example, the computer program 112 may be divided into an acquisition module, a data feature value calculation module, a conversion module, a processing module.

the acquisition module is used for acquiring chromaticity coordinates of the sub-pixels corresponding to each pixel unit in the preset area in the RGB color gamut space;

The processing module is configured to, if the saturation and the hue in the chromaticity coordinate in the LCH color gamut space meet a third preset condition, respectively adjust the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel in the sub-pixels in the preset region according to the third preset condition, so that the gamma value of the adjusted green sub-pixel is greater than the gamma value of the green sub-pixel before adjustment, and the gamma value of the adjusted blue sub-pixel is greater than the gamma value of the blue sub-pixel before adjustment.

The other modules or units may refer to the description of each module or unit in the driving device of the display device, and are not described herein again.

The terminal device includes, but is not limited to, a processor 110 and a memory 111. Those skilled in the art will appreciate that fig. 11 is merely an example of a terminal device 11 and is not intended to limit the terminal device 11 and may include more or less components than those shown, or some components may be combined, or different components, for example, the terminal device may also include input devices, output devices, network access devices, buses, etc.

the storage 111 may be an internal storage unit of the terminal device 11, such as a hard disk or a memory of the terminal device 11. The memory 111 may also be an external storage device of the terminal device 11, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 11. Further, the memory 111 may also include both an internal storage unit and an external storage device of the terminal device 11. The memory 111 is used for storing the computer program and other programs and data required by the terminal device. The memory 111 may also be used to temporarily store data that has been output or is to be output.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A method of driving a display device, comprising:

The third preset condition refers to a range value of saturation and hue in chromaticity coordinates in the LCH color gamut space when the color shift phenomenon is severe under a large viewing angle.

2. the method according to claim 1, wherein after adjusting the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel of the sub-pixels in the predetermined area according to the third predetermined condition, respectively, the method comprises:

And calculating to obtain a backlight target brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset region according to the brightness value corresponding to the initial gamma value of the blue sub-pixel and the brightness value corresponding to the target gamma value of the blue sub-pixel.

3. The method according to claim 2, wherein the calculating the backlight target brightness signal value of the green sub-pixel in the backlight sub-pixel corresponding to the preset region according to the brightness value corresponding to the initial gamma value of the green sub-pixel and the brightness value corresponding to the target gamma value of the green sub-pixel comprises:

A'_N,MG represents the backlight target brightness signal value of the green sub-pixel in the corresponding backlight sub-pixel in the preset area, A_N, _MG represents the current backlight brightness signal value of the green sub-pixel in the corresponding backlight sub-pixel in the preset area; said L_N,MG represents a brightness value corresponding to an initial gamma value of a green sub-pixel in the sub-pixels in the preset area, and L'_N,MG represents a brightness value corresponding to a target gamma value of a green sub-pixel in sub-pixels in the preset area, and N and M respectively represent the number of rows and columns of the preset area in the divided multiple areas;

The calculating and obtaining the backlight target brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset region according to the brightness value corresponding to the initial gamma value of the blue sub-pixel and the brightness value corresponding to the target gamma value of the blue sub-pixel comprises:

A'_N,MB represents the backlight target brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset area, A_N, _MB represents the current backlight brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset area, and L represents the current backlight brightness signal value_N,MB represents a brightness value L 'corresponding to an initial gamma value of a blue sub-pixel in the sub-pixels in the preset area'_N,MB represents a brightness value corresponding to a target gamma value of a blue sub-pixel in the sub-pixels in the preset area, and N and M respectively represent the number of rows and the number of columns of the preset area in the divided areas.

4. The method of claim 3, wherein the obtaining the brightness value corresponding to the initial gamma value of the green sub-pixel and the brightness value corresponding to the target gamma value of the green sub-pixel comprises:

the brightness value corresponding to the initial gamma value of the green sub-pixel is obtained by the following formula:

the brightness value corresponding to the target gamma value of the green sub-pixel is obtained through the following formula:

Said L_N,MG represents a brightness value corresponding to the initial gamma value of the green sub-pixel, L'_N,MG represents a brightness value corresponding to the target gamma value of the green sub-pixel; LG (255) represents the brightness value of the green sub-pixel with the gray scale of 255, g_GIndicating presetsThe gray scale data characteristic value of the green sub-pixel in each pixel unit in the area; gamma G represents an initial gamma value of the green sub-pixel, and gamma' G represents a target gamma value of the green sub-pixel;

The acquiring a brightness value corresponding to an initial gamma value of the blue sub-pixel and a brightness value corresponding to a target gamma value of the blue sub-pixel comprises:

The brightness value corresponding to the initial gamma value of the blue sub-pixel is obtained through the following formula:

The brightness value corresponding to the target gamma value of the blue sub-pixel is obtained through the following formula:

Said L_N,Mb represents a brightness value corresponding to the initial gamma value of the blue sub-pixel, L'_N,MB represents a brightness value corresponding to the target gamma value of the blue sub-pixel; LB (255) represents a luminance value when the gray scale of the blue sub-pixel is 255, g_BRepresenting the data characteristic value of the gray scale of the blue sub-pixel in each pixel unit in the preset area; γ B represents an initial gamma value of the blue sub-pixel, and γ' B represents a target gamma value of the blue sub-pixel.

5. The method according to claim 1, wherein if the saturation and hue in the chromaticity coordinates in the LCH color gamut space meet a third predetermined condition, adjusting the gamma value of the green sub-pixel and the gamma value of the blue sub-pixel in the sub-pixels in the predetermined region according to the third predetermined condition comprises:

6. The method for driving a display device according to any one of claims 1 to 5, wherein the data characteristic value includes: arithmetic mean, addend mean, geometric mean, variance.

7. A driving apparatus of a display apparatus, comprising:

the processing module is used for respectively adjusting the gamma value of a green sub-pixel and the gamma value of a blue sub-pixel in the sub-pixels in the preset area according to a third preset condition if the saturation and the hue in the chromaticity coordinate in the LCH color gamut space meet the third preset condition, so that the gamma value of the green sub-pixel after adjustment is larger than the gamma value of the green sub-pixel before adjustment, and the gamma value of the blue sub-pixel after adjustment is larger than the gamma value of the blue sub-pixel before adjustment;

8. The driving device of a display device according to claim 7, further comprising:

The brightness value acquisition module of the green sub-pixel is used for taking the gamma value of the green sub-pixel before adjustment as the initial gamma value of the green sub-pixel, taking the gamma value of the green sub-pixel after adjustment as the target gamma value of the green sub-pixel, and acquiring the brightness value corresponding to the initial gamma value of the green sub-pixel and the brightness value corresponding to the target gamma value of the green sub-pixel;

the backlight target brightness signal value determining module of the green sub-pixel is used for calculating according to a brightness value corresponding to the initial gamma value of the green sub-pixel and a brightness value corresponding to the target gamma value of the green sub-pixel to obtain a backlight target brightness signal value of the green sub-pixel in the corresponding backlight sub-pixel in the preset area;

The brightness value acquisition module of the blue sub-pixel is used for taking the gamma value of the blue sub-pixel before adjustment as an initial gamma value of the blue sub-pixel, taking the gamma value of the blue sub-pixel after adjustment as a target gamma value of the blue sub-pixel, and acquiring a brightness value corresponding to the initial gamma value of the blue sub-pixel and a brightness value corresponding to the target gamma value of the blue sub-pixel;

And the backlight target brightness signal value determining module of the blue sub-pixel is used for calculating and obtaining the backlight target brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset region according to the brightness value corresponding to the initial gamma value of the blue sub-pixel and the brightness value corresponding to the target gamma value of the blue sub-pixel.

9. The driving apparatus of a display apparatus according to claim 8, wherein the backlight target luminance signal value determining module of the green sub-pixel is configured to:

the backlight target brightness signal value determination module of the blue sub-pixel is used for:

a'_N,MB represents the backlight target brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset area, A_N, _Mb represents the current backlight brightness signal value of the blue sub-pixel in the corresponding back sub-pixel in the preset area, and L represents the current backlight brightness signal value_N,MB represents a brightness value L 'corresponding to an initial gamma value of a blue sub-pixel in the sub-pixels in the preset area'_N,MB represents saidAnd brightness values corresponding to target gamma values of blue sub-pixels in a preset area, wherein N and M respectively represent the number of rows and the number of columns of the preset area in the divided areas.

10. A method of driving a display device, comprising: