CN119007664A

CN119007664A - Electronic ink screen gray level display method and driving device

Info

Publication number: CN119007664A
Application number: CN202411245901.7A
Authority: CN
Inventors: 毛华望
Original assignee: Jiangxi Xingtai Technology Co Ltd
Current assignee: Jiangxi Xingtai Technology Co Ltd
Priority date: 2024-09-06
Filing date: 2024-09-06
Publication date: 2024-11-22

Abstract

Decomposing a gray scale map into more than one gray scale display area, wherein the size of a pixel array of the gray scale display area is smaller than or equal to the size of a gray scale scattering table; the gray scale display area is compared with the gray scale scattering table according to pixels, the gray scale value is smaller than the gray scale scattering table, and white is displayed; the gray scale display area is compared with the gray scale scattering table according to pixels, the gray scale value is larger than the gray scale scattering table, and black is displayed; the values in the gray level scattering table are randomly distributed according to the set gray levels, and the set gray levels are 64, 16, 8 or 4. The brightness of the whole picture is more symmetrical, and the texture display is clear and not distorted.

Description

Electronic ink screen gray level display method and driving device

Technical Field

The application belongs to the technical field of display, and particularly relates to an image data processing method and device suitable for an electronic ink screen.

Background

The electronic paper has the characteristics of ultralow power consumption, paper-like texture, visibility in sunlight and the like, is widely used in industries of retail, education, medical treatment, advertisement and the like, and saves various resources while improving the intelligent level of the industry; for example, the electronic price tag is used for replacing the traditional paper tag in the retail industry, so that the labor cost can be effectively saved.

Currently common ink screens can be classified into black and white screens, black Bai Huangbing, black Bai Gongbing, black and white Huang Gongbing, and seven color screens. The picture needs to be processed and converted into fewer colors to be better displayed on the electronic ink screen. The display effect of the electronic paper is required to be higher and higher by the terminal clients, and the display effect is expected to be more real.

Therefore, how to process the pictures so that the pictures can achieve more real effects with fewer colors is particularly important in the electronic paper industry. In the current black-and-white screen of electronic paper, the number of gray scales is very limited. Usually only 16 gray levels, less only 8 gray levels, 4 gray levels.

The gray scale is realized by a dot gray scale algorithm, and the gray scale is represented by the density of white dots and black dots. The density distribution pattern of white and black points greatly affects the display effect.

The algorithm completes the dot gray scale based on the symmetrical energy. In this way, the dot layout of the whole picture can be made uniform. Close range viewing is relatively well-balanced.

Is a dot gray scale algorithm with symmetrical pictures. The brightness of the whole picture can be more uniform.

Disclosure of Invention

In order to solve the problems that in the prior art, the dither point algorithm is uneven in display effect and uneven in brightness of the whole picture due to the fact that energy is concentrated on the right side, the gray scale display method of the electronic ink screen is provided, and the brightness of the whole picture can be more even.

The problem that the texture display is distorted after the brightness sense of the whole picture is symmetrical can be further solved, and the gray scale display method of the electronic ink screen is provided, so that the brightness sense of the whole picture is more symmetrical, and meanwhile, the texture display is clear and not distorted.

The technical scheme for solving the technical problems is that the gray scale display method of the electronic ink screen comprises the steps of decomposing a gray scale image into more than one gray scale display area, wherein the size of a pixel array of the gray scale display area is smaller than or equal to that of a gray scale scattering table; the gray scale display area is compared with the gray scale scattering table according to pixels, the gray scale value is smaller than the gray scale scattering table, and white is displayed; the gray scale display area is compared with the gray scale scattering table according to pixels, the gray scale value is larger than the gray scale scattering table, and black is displayed; the values in the gray level scattering table are randomly distributed according to the set gray levels, and the set gray levels are 64, 16, 8 or 4.

The gray scale map is obtained by color picture conversion.

The gray level scattering table is 64 gray levels, and the gray level scattering table is 8 rows and 8 columns and has 64 pixel points.

The gray level scattering table is divided into 4 gray level scattering sub-tables, and each gray level scattering sub-table has 16 pixel points.

The pixel values in the gray level scattering sub-table are distributed according to random sizes.

The pixel values in the gray level scattering sub-table are distributed according to the shape of the Chinese character 'mi'.

And calculating the value of the gray level scattering sub-table according to the pixel number multiplied by 4 < + > sub-table.

The technical scheme for solving the technical problems can also be an electronic ink screen driving device, and the driving device displays gray values according to the gray display method of the electronic ink screen.

The technical scheme for solving the technical problems can also be a data storage device, wherein the data storage device stores a gray level scattering table in the gray level display method of the electronic ink screen.

The technical scheme of the application has the beneficial effects that 1, the values in the gray level scattering table are randomly distributed according to the set gray level, so that the display is more uniform.

The technical scheme of the application has the beneficial effects that 1, the gray level images are obtained by converting color pictures, and the method is applicable to various gray level images.

The technical scheme of the application has the beneficial effects that 1, the gray level scattering table is 64 gray levels, the gray level scattering table is 8 rows and 8 columns, 64 pixel points are arranged, and compared with the prior art, the gray level which can be displayed is more and the gray level is richer.

The technical scheme of the application has the beneficial effects that 1, the pixel values in the gray scale scattering sub-table are distributed according to random sizes, so that the gray scale map can be displayed more uniformly.

The technical scheme of the application has the beneficial effects that 1, the gray scale scattering sub-table value is calculated according to the pixel number multiplied by 4+ sub-table number, the calculated amount is small, and the gray scale display can be more uniform.

The technical scheme of the application has the beneficial effects that 1, the pixel values in the gray scale scattering sub-table are distributed according to the shape of the Chinese character 'mi', so that the display effect on the textured gray scale map is better, the display uniformity effect can be maintained, and the display effect of the texture can be maintained without distortion due to uniformity.

The electronic ink screen driving device has the beneficial effects that 1, the electronic ink screen driving device displays gray values by using the method, the effect is uniform, and textures are not distorted.

Drawings

FIG. 1 is a schematic illustration of an electronic ink gray scale display 1;

FIG. 2 is a schematic illustration of an electronic ink gray scale display 2;

FIG. 3 is a schematic illustration of an electronic ink gray scale display 3;

FIG. 4 is a schematic diagram 1 of a gray level scattering table;

FIG. 5 is a schematic diagram of a gray level scattering table 2;

FIG. 6 is a schematic diagram 3 of a gray level scattering table;

FIG. 7 is a partial encoding of a picture to be displayed;

FIG. 8 is a calculated code number of a picture to be displayed;

FIG. 9 is a black and white image encoding after random scattering;

FIG. 10 is a flow chart diagram 1 of a gray scale display method of an electronic ink screen;

FIG. 11 is a schematic illustration of an electronic ink gray scale display 4;

FIG. 12 is an electronic ink gray scale display schematic 5;

FIG. 13 is an electronic ink gray scale display schematic 6;

FIG. 14 is a schematic diagram of a gray level scattering table 4;

FIG. 15 is a schematic diagram of a calculation process of the local gray-scale scattering table in FIG. 14;

FIG. 16 is a schematic diagram of a calculation process of obtaining a black-and-white image code from the calculation of the local gray-scale scattering table in FIG. 15;

FIG. 17 is a schematic diagram 1 of an electronic ink screen gray scale display method;

FIG. 18 is a schematic diagram 2 of a gray scale display method of an electronic ink screen;

FIG. 19 is a schematic diagram 3 of a gray scale display method of an electronic ink screen;

fig. 20 is a schematic diagram 4 of a gray scale display method of an electronic ink screen.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the drawings.

The following description of the preferred embodiments of the present application is not intended to limit the present application. The description of the preferred embodiments of the present application is merely illustrative of the general principles of the application. The embodiments described in this disclosure are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings are merely for convenience in describing the present application and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and technical features numbered with numerals such as Arabic numerals 1,2, 3, etc., and such numbers as "A" and "B" are used for descriptive purposes only and are not intended to represent a temporal or spatial sequential relationship for ease of illustration; and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first", "second", and numbered with numerals 1,2, 3, etc., may explicitly or implicitly include one or more such features. In the description of the present application, the meaning of "a number" is two or more, unless explicitly defined otherwise.

As shown in fig. 17, a gray scale display method of an electronic ink screen includes decomposing a gray scale map into more than one gray scale display area, wherein the size of a pixel array of the gray scale display area is smaller than or equal to the size of a gray scale scattering table; the gray scale display area is compared with the gray scale scattering table according to pixels, the gray scale value is smaller than the gray scale scattering table, and white is displayed; the gray scale display area is compared with the gray scale scattering table according to pixels, the gray scale value is larger than the gray scale scattering table, and black is displayed; the values in the gray level scattering table are randomly distributed according to the set gray levels, and the set gray levels are 64, 16, 8 or 4.

As shown in fig. 17, the gray scale map and the gray scale scattering table are compared and calculated to obtain a black-and-white map code, and the display is driven to display according to the black-and-white map code. As in fig. 18, the gray-scale map is obtained by color picture conversion.

As shown in fig. 4 to 9, and fig. 14 to 16, the gray-scale scattering table is 64 gray scales, and the gray-scale scattering table is 8 rows, 8 columns, and 64 pixel points.

As shown in fig. 4 to 9, and fig. 14 to 16, the gray-scale dispersion table is divided into 4 gray-scale dispersion tables, each having 16 pixels. And calculating the value of the gray level scattering sub-table according to the pixel number multiplied by 4 < + > sub-table.

As shown in fig. 19, the sizes of the pixel values in the gray scale scattering sub-table are distributed according to random sizes.

As shown in fig. 20, the pixel values in the gray scale scattering sub-table are distributed according to the shape of "m".

As shown in fig. 1, a normal screen for an electronic paper display test is shown. In electronic paper displays, the number of gray levels is very limited, typically 16 gray levels; less only 8 gray scales and 4 gray scales. The dot gray scale algorithm is adopted in the gray scale realization. The dot gray scale algorithm is to represent gray scales by densities of white dots and black dots.

Shown in fig. 2 is a black-and-white dot matrix displayed using a dot gray scale algorithm conventional in the prior art. The conventional dot gray scale algorithm in the prior art is a dither dot algorithm. The dither algorithm is to sacrifice resolution to increase the number of colors. Gray scale display is performed by the degree of density of black dots. If the screen is only black and white, a portion of the area matrix, for example, a 2x 2 matrix, can be sampled to display 5 levels of gray scale, and when 4 pixels are used as one pixel, there will be 5 levels of gray scale. As shown in fig. 2, the dither point algorithm is uneven in display effect, mainly because the energy is too concentrated on the right side. So that the opposite right lattice is concentrated.

How to make the display effect better, the layout of the points of the whole picture can be symmetrical, and especially the display effect can be relatively symmetrical when the picture is watched at a short distance is a technical problem to be solved.

As shown in fig. 3, the black-and-white dot matrix displayed by the dot gray scale algorithm in the present application is shown. In the application, a random gray level scattering table is adopted to finish a dot gray level algorithm. The effect of point gray scale can be achieved, and calculation is greatly simplified.

In the application, the set point gray scale algorithm is firstly used for representing more or less gray scales. Such as: the 64 gray scales are characterized. Other gray scales are also possible. Typically 64, 128 gray levels, 256 gray levels. Fig. 4 and 5 are random gray-scale scattering tables for characterizing 64 gray-scales.

The gray-scale scattering table as in fig. 4 and 5 is divided into 4 areas. The upper left 16 lattices are the first areas; the upper right 16 lattices are the second areas; the bottom left 16 lattices are the fourth area; the bottom right 16 dots are the third region. The gray-scale scattering table 8×8 may be 16×4. Rectangular and square boxes are generally a relatively good choice. The present scheme employs 4 partitions, i.e., 16×4. More partitions are also possible, such as: 8 partitions, 6 partitions. The region is filled with data, and the state in the case is not limited. Relatively uniform.

As shown in FIG. 5, the first area is filled with data ：1,1×4+1＝5,2×4+1＝9,3×4+1＝13,4×4+1＝17,5×4+1＝21,6×4+1＝25,7×4+1＝29,8×4+1＝33,9×4+1＝37,10×4+1＝41,11×4+1＝45,12×4+1＝49,13×4+1＝53,14×4+1＝57,15×4+1＝61.

As in fig. 5, the second area is filled with data: 2,1×4+2,2×4+2,3×4+2,4×4+2. . . . . .15×4+2=62.

As in fig. 5, the third area is filled with data: 3,1×4+3,2×4+3,3×4+3,4×4+3. . . . . . .15×4+3=63.

As in fig. 5, the fourth area is filled with data: 4,1×4+4,2×4+4,3×4+4,4×4+4. . . . . .15×4+4=64.

Fig. 6 is a data distribution after each partition is randomly scattered on the basis of fig. 5. As shown in fig. 7, a 256-gradation, i.e., 8-gradation gray-scale image to be displayed is a 4×4 unit gray-scale structure. The corresponding positional relationship is shown in fig. 8.

Comparing the data x 4 of the corresponding position in the table of fig. 6 with the data of the corresponding position in fig. 7, and carrying out assignment of gray scale of each point according to the comparison result; the result of the assignment is output and calculated to fig. 8 for display. If data x 4 of fig. 6 is larger than data of the corresponding position of fig. 7, the dot gradation value is assigned 255. If data x 4 of fig. 6 is smaller than the data of the corresponding position in fig. 7, the point is assigned a value of 0. The calculated result is 0 and white is displayed; the calculated result is 255, and black is displayed.

As shown in the calculation process of fig. 6 to 8:

the point 0< 61X 4 is Nx y, so Nx y is calculated to be 0.

The point of Nx+1 y is 120>21 x 4 so that Nx+1 y is 255.

This point 65<53 x 4 for Nx+2 y is calculated to be 0 for Nx+2 y.

The point 129 of Nx+3 y is 13X 4, so Nx+3 y is 255.

Fig. 9 shows the calculation results according to fig. 6 and 7. As shown in fig. 3, the display effect using the algorithm described above. The algorithm is a dot gray scale algorithm completed based on regional probability statistics. The calculation rule of the algorithm is that a pixel point in a picture and a point in a random gray level scattering table are compared in size to determine whether 0 or 255 is a black point or a white point.

Any point in the pixel is taken. Such as 100 brightness. The probability that this 100 luminance is 0 is 39/64 and the probability is 25/64 of 255. If the entire picture appears 64 times 100 luminance values, there are likely 39 out of the 64 100 luminance values to be 0 and 25 to be 255. As is the result of the dither point algorithm. Perceptually, the dithering algorithm is that the probability of occurrence of the darker place 0 is a bit higher than the probability of occurrence of the whiter place 255. Thus, gray scales are formed. The same can be done with matrix probability tables.

The algorithm in the application uses a random gray level scattering table to scan the whole picture once. Black and white dot patterns of 0 and 255 are formed according to an algorithm. The random gray level scattering table is re-scattered once after being executed for several times. The uniformity of the picture is scattered by random gray scale. The random gray-scale scattering table has uniformly dispersed dots, so that the picture is also uniformly dispersed.

When the start command is clicked, the initialization state is completed, such as: reading in relevant data of the electronic paper, resetting basic parameters and the like. The image is then input and stored into ddr. When one picture is stored, the dot gray scale algorithm is started to operate. The result of the calculation is put back into ddr. When the calculation of one picture is completed. And reading out the dot gray scale graph. And outputting the data to electronic paper for display. The image data of the front end is processed into a gradation image, and then stored in ddr3 (memory) for gradation image. Then, the algorithm calculation is carried out, the calculated value is stored, when the display is ready, the proper waveform is searched according to the read brightness value, and the lighting is completed.

The algorithm adopts a random gray level scattering table to finish a dot gray level algorithm. The effect of point gray scale can be achieved, and calculation is greatly simplified.

As shown in fig. 3, the above algorithm can make the dot layout of the whole picture uniform. Close range viewing is relatively well-balanced. Where there are relatively many pictures, uniformity will look more pleasant.

However, when a picture including many lines such as text and form as shown in fig. 11 is displayed, the lines such as text and form are more prominent. The uniform algorithm breaks the ridge and the display appears to be abnormal as shown in fig. 13, and the vertical direction of the picture is symmetrical as much as that of fig. 12. However, when a ridge line exists in the picture of fig. 13, the ridge line display is destroyed, and a good effect is not obtained. Such as a rectangular table in the picture, because the ridge becomes skewed after homogenization. As shown in fig. 12, although the ridge line display effect is not deteriorated, the display effect is uneven, mainly because energy is too concentrated on the right side. Therefore, the opposite right lattice is concentrated. How to make the display uniform and protect the display effect of the ridge line under the balanced condition.

Based on fig. 6, according to fig. 14, the gray-scale scattering table is randomly scattered in a zigzag pattern. There are also rules for randomization as shown here. The standard texture state may be referred to as a "rice" type. Therefore, the scattering rules are scattered in the direction of the Chinese character Mi. Therefore, the rule of scattering is strict. Distribution rules of current cases: the order layout of "\"/"-" | "is shown.

Taking the partial picture of fig. 7 as an example, the calculation shown in fig. 15 is performed first. As shown in fig. 16, the result obtained by the calculation in fig. 15 is compared with fig. 7, and dot matrix data for displaying black and white, i.e., black and white map encoded dot matrix data is obtained. Display driving is performed according to black-and-white image coding in fig. 16.

The rule of this embodiment is different from that of the previous embodiment. The principle of random scattering is to let all close neighbors be scattered. Therefore, the gray-scale scattering table is completely irregular. And requires multiple breaks during operation. But not the texture, so that the similarity occurs in the texture direction. Therefore, the gray-scale scattering table is laid out in the direction of the texture. The texture gray level scattering table may not be updated. Only 1 is needed. The gray level scattering table may not be partitioned. The random break-up is evenly distributed. The texture breaks up unevenly. The random scattering is uniform for the picture and the gray scale is obvious. And the texture scattering is used for a scene with more textures, and the gray scale is less. Therefore, there may be a plurality of 1 s, a plurality of 60 s, etc. in the random gray level scattering table, or there may be no 20 s, 23 s, etc. According to the texture characteristics, gray scales are concentrated in black and white, and the gray scales in the middle are relatively small.

When the start command is clicked, the initialization state is completed, such as: reading in relevant data of the electronic paper, resetting basic parameters and the like. The image is then input and stored into ddr. When one picture is stored, the dot gray scale algorithm is started to operate. The result of the calculation is put back into ddr. When the calculation of one picture is completed. And reading out the dot gray scale graph. And outputting the data to electronic paper for display. The front image data is processed into gray level images, and then gray level images are stored in a ddr3 memory. Then, the algorithm calculation is carried out, the calculated value is stored, when the display is prepared, the proper waveform is searched according to the read brightness value, and the lighting is completed.

A driving device of an electronic ink screen displays gray values according to the gray display method of the electronic ink screen.

A data storage device is used for protecting a gray scale scattering table in the gray scale display method of the electronic ink screen.

The foregoing description of the embodiments of the application, as illustrated in the accompanying drawings, is not intended to limit the scope of the application, but rather to utilize the equivalent structures or equivalent flow modifications in the disclosure and the drawings, or directly or indirectly applied to other related technical fields, and the patent protection scope of the application is also included.

Claims

1. A grayscale display method for an electronic ink screen, characterized in that:

include:

Decomposing the grayscale image into more than one grayscale display area, wherein the pixel array size of the grayscale display area is less than or equal to the size of the grayscale decomposition table;

The grayscale display area is compared with the grayscale dispersion table according to pixels, and if the grayscale value is less than the value of the grayscale dispersion table, white is displayed;

The grayscale display area is compared with the grayscale dispersion table according to pixels, and if the grayscale value is greater than the value of the grayscale dispersion table, black is displayed;

The values in the grayscale scattering table are randomly distributed according to the set grayscale, and the set grayscale is 64, 16, 8 or 4.

2. The grayscale display method of the electronic ink screen according to claim 1 is characterized in that the grayscale image is obtained by converting a color image.

3. The grayscale display method of electronic ink screen according to claim 1, characterized in that:

The grayscale scattering table has 64 grayscales, and the grayscale scattering table has 8 rows and 8 columns, and has 64 pixel points.

4. The grayscale display method of electronic ink screen according to claim 3, characterized in that:

The grayscale scattering table is divided into 4 grayscale scattering sub-tables, and each grayscale scattering sub-table has 16 pixel points.

5. The electronic ink screen grayscale display method according to claim 4 is characterized in that the sizes of the pixel values inside the grayscale scattered sub-table are distributed in a random size.

6. The grayscale display method of an electronic ink screen according to claim 4 is characterized in that the sizes of the pixel values inside the grayscale scattered sub-table are distributed in a "M" shape.

7. The electronic ink screen grayscale display method according to claim 4 is characterized in that the value of the grayscale scattered sub-table is calculated according to pixel number × 4 + sub-table number.

8. An electronic ink screen driving device, characterized in that the driving device displays grayscale values according to the electronic ink screen grayscale display method according to any one of claims 1 to 7.

9. A data storage device, characterized in that the data storage device stores a grayscale dispersion table in the electronic ink screen grayscale display method according to any one of claims 1 to 7.