Four-color electronic paper display data conversion, mapping, and display method and apparatus

Abstract

In the four-color electronic paper display data conversion, mapping, and display method and apparatus, image data is converted into grayscale data; each display sub-unit includes N×N pixels; the grayscale data interval is divided into four grayscale intervals; one grayscale interval corresponds to one color of electronic paper; the average grayscale value A1 of the N×N pixels of the display sub-unit is calculated; if the average grayscale value A1 falls within the corresponding grayscale interval range, the display sub-unit displays the color corresponding to that grayscale interval. For one display color of electronic paper, four grayscale units are established; each grayscale unit includes M pixel units; the grayscale unit includes grayscale units K1 to K4, each including M1 to M4 color-displaying pixels; M1 is greater than M2, M2 is greater than M3, and M3 is greater than M4; the standard image is divided into display sub-units according to W pixel units, and the average grayscale value of the pixels in the display sub-unit corresponds to one grayscale unit of the four colors.

Description

Technical Field

[0001] This application belongs to the field of display technology, specifically relating to a four-color electronic paper display data conversion and mapping method and display device. Background Technology

[0002] Electronic paper features ultra-low power consumption, paper-like texture, and sunlight visibility, and is widely used in industries such as retail, education, healthcare, and advertising. It improves the level of intelligence in these industries while saving various resources. For example, in the retail industry, using electronic price tags to replace traditional paper labels can effectively save labor costs.

[0003] Currently, common e-ink displays include monochrome displays; there are also color e-paper displays, such as four-color e-paper (black, red, yellow, white) or blue, white, red, and green. Images need to be processed and converted into fewer colors to better display on e-ink displays. End users have increasingly higher requirements for the display effect of e-paper, hoping for a more realistic display.

[0004] Therefore, how to process images to achieve a more realistic effect with fewer colors is particularly important in the e-paper industry. Hardware systems with fewer colors will result in a monotonous screen display by directly displaying only four colors; how to solve this problem and create richer color gradations is a technical challenge that needs to be addressed. Summary of the Invention

[0005] To address the issue that displaying only four colors in existing technologies results in a monotonous screen color display, a four-color electronic paper display data conversion, mapping, and display method and apparatus is provided that can make the color gradation of the entire screen display richer.

[0006] The technical solution of this application to solve the above-mentioned technical problems is a four-color electronic paper display data conversion method. It adopts a color image in a standard image format to obtain image data; converts the image data into grayscale data; divides the image into display sub-units, each display sub-unit including N×N pixels; divides the grayscale data into four grayscale intervals; each grayscale interval corresponds to a color of the electronic paper; calculates the average grayscale value A1 of the N×N pixels in the display sub-unit; determines the grayscale interval range into which the average grayscale value A1 falls; if it falls into the corresponding grayscale interval range, the display sub-unit displays the color corresponding to that grayscale interval.

[0007] The colors of electronic paper include black, red, yellow, and white; the grayscale data is divided into four grayscale ranges: the first grayscale range: 0-63 represents black; the second grayscale range: 64-127 represents red; the third grayscale range: 128-191 represents yellow; and the fourth grayscale range: 192-255 represents white.

[0008] The colors include blue, white, red, and green.

[0009] In an N×N pixel array, where N is 4, the size of the display sub-unit is 4×4.

[0010] In the first grayscale range, a grayscale average value A1 of 0 indicates the darkest black, and all 4×4 pixels of the display sub-unit are displayed as black; a grayscale average value A1 of 63 indicates a lighter black, and some of the 4×4 pixels of the display sub-unit are displayed as black.

[0011] In the second grayscale range, a grayscale average value A1 of 64 indicates the reddest color, and all 4×4 pixels of the display sub-unit are red; a grayscale average value A1 of 127 indicates a lighter color, and some of the 4×4 pixels of the display sub-unit are red.

[0012] In the third grayscale range, a grayscale average value A1 of 128 indicates the yellowest color, where all 4×4 pixels of the display sub-unit are yellow; a grayscale average value A1 of 191 indicates a lighter color, where some of the 4×4 pixels of the display sub-unit are yellow.

[0013] In the fourth grayscale range, a grayscale average value A1 of 192 indicates the whitest color, and all 4×4 pixels of the display sub-unit are displayed as white; a grayscale average value A1 of 255 is lighter, and some of the 4×4 pixels of the display sub-unit are displayed as white.

[0014] The first grayscale range is divided into four grayscale sub-ranges: Q11, Q12, Q13, and Q14. These are: Q11 [0-15]; Q12 [16-31]; Q13 [32-47]; and Q14 [48-63]. If the average grayscale value A1 falls into the Q11 range, all pixels in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 falls into the Q12 range, 10 pixels in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 falls into the Q13 range, 6 pixels in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 falls into the Q14 range, 1 pixel in the 4×4 pixel sub-unit will be black.

[0015] The second grayscale range is divided into four sub-ranges: Q21, Q22, Q23, and Q24. These are: Q21 [64-79]; Q22 [80-95]; Q23 [96-111]; and Q24 [112-127]. If the average grayscale value A1 falls within the Q21 range, all pixels in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 falls within the Q22 range, 10 pixels in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 falls within the Q23 range, 6 pixels in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 falls within the Q24 range, 1 pixel in the 4×4 pixel sub-unit will be red.

[0016] The third grayscale range is divided into four sub-ranges: Q31, Q32, Q33, and Q34. These are: Q31 [128-143]; Q32 [144-159]; Q33 [160-175]; and Q34 [176-191]. If the average grayscale value A1 falls into the Q21 range, all pixels in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 falls into the Q22 range, 10 pixels in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 falls into the Q23 range, 6 pixels in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 falls into the Q24 range, 1 pixel in the 4×4 pixel sub-unit will display yellow.

[0017] The fourth grayscale range is divided into four sub-ranges: Q41, Q42, Q43, and Q44. These are: Q41 [192-207]; Q42 [208-223]; Q43 [224-239]; and Q44 [240-255]. If the average grayscale value A1 falls into the Q41 range, all pixels in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 falls into the Q42 range, 10 pixels in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 falls into the Q43 range, 6 pixels in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 falls into the Q44 range, 1 pixel in the 4×4 pixel sub-unit will be white.

[0018] The technical solution of this application to solve the above-mentioned technical problems can also be a four-color electronic paper display data mapping method. For one display color of the electronic paper, four grayscale units are established; each grayscale unit includes M pixel units; the grayscale units include grayscale unit K1, grayscale unit K2, grayscale unit K3, and grayscale unit K4; grayscale unit K1 includes M1 color-displaying pixels; grayscale unit K2 includes M2 color-displaying pixels; grayscale unit K3 includes M3 color-displaying pixels; grayscale unit K4 includes M4 color-displaying pixels; M1 is greater than M2, M2 is greater than M3, and M3 is greater than M4; the standard image is divided into display sub-units according to W pixel units, and the average grayscale value of the pixels in the display sub-unit corresponds to one grayscale unit of the four colors.

[0019] The four-color electronic paper display data mapping method uses four colors: black, red, yellow, and white.

[0020] The four-color electronic paper display data mapping method uses four colors: blue, white, red, and green.

[0021] It can be, where W is N×N pixels, and N is a natural number.

[0022] It can be that M1, M2, M3, and M4 color pixels are evenly distributed in the corresponding grayscale unit space.

[0023] It is possible that the W value equals the M value, and W equals 16.

[0024] The technical solution of this application to solve the above-mentioned technical problems can also be a full-color electronic paper display method, which converts the pixel data format in the image to be displayed into a full-color electronic paper image format based on the above-mentioned data format conversion method.

[0025] The technical solution of this application to solve the above-mentioned technical problems can also be a full-color electronic paper display device, which displays based on the above method.

[0026] One of the beneficial effects of the technical solution in this application is that a grayscale range corresponds to a color, allowing each color on the electronic paper to correspond to a grayscale value range, and then, based on the specific grayscale values ​​of the grayscale value range, the color can be expressed in more subtle multiple levels.

[0027] One of the beneficial effects of the technical solution in this application is that colors can be expressed in more subtle multiple levels according to the specific gray values ​​within the gray value range; such a correspondence can be expanded as needed, and the finer the distinction, the richer the color levels.

[0028] One of the beneficial effects of the technical solution in this application is that the four grayscale ranges correspond to four colors, and more colors or different types of colors can be matched in the ranges according to the characteristics of different electronic papers.

[0029] One of the beneficial effects of the technical solution in this application is that the display subunit includes N×N pixels, providing a gradient space for displaying different shades of color.

[0030] One of the beneficial effects of the technical solution in this application is that each grayscale range is further divided into four sub-ranges, which further enriches the color levels.

[0031] One of the beneficial effects of the technical solution in this application is that the four-color electronic paper display data mapping method establishes a partitioned correspondence between grayscale and color, making the color display levels richer.

[0032] One of the beneficial effects of the technical solution in this application is that the M1, M2, M3, and M4 color pixels are evenly distributed in the corresponding grayscale unit space, making the gradient of each color more uniform.

[0033] One of the beneficial effects of the technical solution in this application is that the W value is equal to the M value, which is equal to 16. This is very suitable for integer division of the conventional 256 data range, making it easier to establish mapping relationships, simplifying the calculation process, and saving computing power. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the conversion method;

[0035] Figure 2 This is a schematic diagram of the conversion method;

[0036] Figure 3 This is a schematic diagram of the conversion method;

[0037] Figure 4 This is a schematic diagram illustrating the data transformation process.

[0038] Figure 5 This is a schematic diagram of the range of average grayscale values;

[0039] Figure 6 This is a schematic diagram showing the average grayscale value falling into different grayscale sub-intervals;

[0040] Figure 7 This is a schematic diagram showing the average grayscale value falling into different grayscale sub-intervals;

[0041] Figure 8 This is a schematic diagram showing the average grayscale value falling into different grayscale sub-intervals;

[0042] Figure 9 This is a schematic diagram showing the average grayscale value falling into different grayscale sub-intervals;

[0043] Figure 10 This is a schematic diagram of color-displaying pixels where the average grayscale value of the display sub-unit falls into different grayscale sub-ranges. Detailed Implementation

[0044] The embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0045] It should be noted that the following description of preferred embodiments of this application does not constitute any limitation on this application. The description of preferred embodiments is merely an illustration of the general principles of this application. The embodiments described in this application are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and technical features numbered with Arabic numerals 1, 2, 3, etc., and designations such as "A" and "B," are used for descriptive purposes only, for ease of explanation, and do not represent a temporal or spatial order; they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first," "second," and numbered with Arabic numerals 1, 2, 3, etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "several" means two or more, unless otherwise expressly and specifically defined.

[0047] like Figures 1 to 3 A method for converting data in a four-color electronic paper display involves taking a color image in a standard image format and obtaining image data. For example... Figure 2 This converts image data into grayscale data.

[0048] like Figure 3 and Figure 4 The image is divided into display sub-units, each containing N×N pixels. The image is divided into 4×4 display sub-units, and the average grayscale value of 16 pixels is calculated. The grayscale data is divided into four grayscale intervals. Each grayscale interval corresponds to a color of electronic paper. The average grayscale value A1 of the N×N pixels in the display sub-unit is calculated. The range of grayscale intervals that the average grayscale value A1 falls into is determined. If the average grayscale value A1 falls into the corresponding grayscale interval, the display sub-unit displays the color corresponding to that grayscale interval.

[0049] like Figure 5 The electronic paper's colors include black, red, yellow, and white. The grayscale data is divided into four grayscale ranges: the first grayscale range (0-63) represents black; the second grayscale range (64-127) represents red; the third grayscale range (128-191) represents yellow; and the fourth grayscale range (192-255) represents white. The threshold values ​​of 64, 128, and 192 can be adjusted to other values.

[0050] In other embodiments, the electronic paper is colored blue, white, red, or green.

[0051] like Figure 7In a set of N×N pixels, where N is 4, the size of the display sub-unit is 4×4.

[0052] like Figures 6 to 9 In the first grayscale range, a grayscale average value A1 of 0 indicates the darkest black, and all 4×4 pixels of the display sub-unit are displayed as black; a grayscale average value A1 of 63 indicates a lighter black, and some of the 4×4 pixels of the display sub-unit are displayed as black.

[0053] like Figures 6 to 9 In the second grayscale range, a grayscale average value A1 of 64 indicates the reddest color, and all 4×4 pixels of the display sub-unit are red; a grayscale average value A1 of 127 indicates a lighter color, and some of the 4×4 pixels of the display sub-unit are red.

[0054] like Figures 6 to 9 In the third grayscale range, a grayscale average value A1 of 128 indicates the yellowest color, meaning all 4×4 pixels of the display sub-unit will display yellow; a grayscale average value A1 of 191 indicates a lighter color, meaning some of the 4×4 pixels of the display sub-unit will display yellow.

[0055] like Figures 6 to 9 In the fourth grayscale range, a grayscale average value A1 of 192 indicates the whitest color, and all 4×4 pixels of the display sub-unit are displayed as white; a grayscale average value A1 of 255 is lighter, and some of the 4×4 pixels of the display sub-unit are displayed as white.

[0056] like Figure 8 The first grayscale range is divided into four sub-ranges: Q11, Q12, Q13, and Q14. These are: Q11 [0-15]; Q12 [16-31]; Q13 [32-47]; and Q14 [48-63]. If the average grayscale value A1 falls within the Q11 range, all pixels in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 falls within the Q12 range, 10 pixels in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 falls within the Q13 range, 6 pixels in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 falls within the Q14 range, 1 pixel in the 4×4 pixel sub-unit will be black. If the average grayscale value A1 = 40, then it falls within the 32-47 range.

[0057] like Figure 7The second grayscale range is divided into four sub-ranges: Q21, Q22, Q23, and Q24. These are: Q21 [64-79]; Q22 [80-95]; Q23 [96-111]; and Q24 [112-127]. If the average grayscale value A1 falls within the Q21 range, all pixels in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 falls within the Q22 range, 10 pixels in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 falls within the Q23 range, 6 pixels in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 falls within the Q24 range, 1 pixel in the 4×4 pixel sub-unit will be red. If the average grayscale value A1 = 64, then it falls within the 64-127 range.

[0058] like Figure 6 The third grayscale range is divided into four sub-ranges Q31, Q32, Q33, and Q34: Q31 [128-143]; Q32 [144-159]; Q33 [160-175]; Q34 [176-191]. If the average grayscale value A1 falls into the Q21 range, all pixels in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 falls into the Q22 range, 10 pixels in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 falls into the Q23 range, 6 pixels in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 falls into the Q24 range, 1 pixel in the 4×4 pixel sub-unit will display yellow. If the average grayscale value A1 = 130, then it falls into the 128-191 range.

[0059] like Figure 10 If the average grayscale value A1 = 130, then falling within the 128-191 range, all 16 pixels in the 4×4 pixel display sub-unit will display yellow. If the average grayscale value falls within the 144-159 range, then 10 pixels in the 4×4 pixel display sub-unit will display yellow. If the average grayscale value falls within the 160-175 range, then 6 pixels in the 4×4 pixel display sub-unit will display yellow. If the average grayscale value falls within the 176-191 range, then 1 pixel in the 4×4 pixel display sub-unit will display yellow. The number of pixels can be set. The threshold limits for Q31, Q32, Q33, and Q34 can also be set or adjusted.

[0060] like Figure 9The fourth grayscale range is divided into four sub-ranges Q41, Q42, Q43, and Q44: Q41 [192-207]; Q42 [208-223]; Q43 [224-239]; Q44 [240-255]. If the average grayscale value A1 falls within the Q41 range, all pixels in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 falls within the Q42 range, 10 pixels in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 falls within the Q43 range, 6 pixels in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 falls within the Q44 range, 1 pixel in the 4×4 pixel sub-unit will be white. If the average grayscale value A1 = 208, then it falls within the 208-223 range.

[0061] like Figure 10 A four-color electronic paper display data mapping method is proposed. For one display color of the electronic paper, four grayscale units are established; each grayscale unit includes M pixel units; M is 16. The grayscale units include grayscale unit K1, grayscale unit K2, grayscale unit K3, and grayscale unit K4. Grayscale unit K1 includes M1 color pixels; M1 is 16. Grayscale unit K2 includes M2 color pixels; M2 is 10. Grayscale unit K3 includes M3 color pixels; M3 is 6. Grayscale unit K4 includes M4 color pixels; M4 is 1. M1 is greater than M2, M2 is greater than M3, and M3 is greater than M4; the M1, M2, M3, and M4 color pixels can be evenly distributed in the corresponding grayscale unit space.

[0062] A standard image is divided into display sub-units of W pixels, where W is N×N pixels and N is a natural number. Figure 10 In this context, W is 16. The average grayscale value of the pixels in the display sub-unit corresponds to one of the four grayscale units. Alternatively, the W value can be equal to the M value, or W can be equal to 16.

[0063] The four-color electronic paper display data mapping method uses four colors: black, red, yellow, and white. The four-color electronic paper display data mapping method also uses four colors: blue, white, red, and green.

[0064] The technical solution of this application to solve the above-mentioned technical problems can also be a full-color electronic paper display method, which converts the pixel data format in the image to be displayed into a full-color electronic paper image format based on the above-mentioned data format conversion method.

[0065] The technical solution of this application to solve the above-mentioned technical problems can also be a full-color electronic paper display device, which displays based on the above method.

[0066] As shown in the accompanying drawings, the above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of the invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for converting data in a four-color electronic paper display, characterized in that, Obtain a color image in standard image format to get the image data; Convert the image data into grayscale data; The image is divided into display sub-units, each of which contains N×N pixels; The grayscale data is divided into four grayscale intervals; One grayscale range corresponds to one color of electronic paper; Calculate the average grayscale value A1 of the N×N pixels in the display subunit; Determine the range of grayscale values ​​that the average grayscale value A1 falls within; If the grayscale value falls within the corresponding grayscale range, the display sub-unit will display the color corresponding to that grayscale range. The electronic paper comes in colors including black, red, yellow, and white; The grayscale data is divided into four grayscale intervals: The first grayscale range: 0-63 represents black; The second grayscale range: 64-127 represents red; The third grayscale range: 128-191 represents yellow; The fourth grayscale range: 192-255 represents white; In the N×N pixels, N takes the value of 4, and the size of the display subunit is 4×4; The first grayscale range is divided into four grayscale sub-ranges: Q11, Q12, Q13, and Q14; namely: Q11[0-15]; Q12[16-31]; Q13[32-47]; Q14[48-63]; When the average grayscale value A1 falls into the Q11 range, all pixels in the 4×4 pixel sub-unit are displayed as black; when the average grayscale value A1 falls into the Q12 range, 10 pixels in the 4×4 pixel sub-unit are displayed as black; when the average grayscale value A1 falls into the Q13 range, 6 pixels in the 4×4 pixel sub-unit are displayed as black. The average grayscale value A1 falls within the Q14 range, and in the 4×4 pixels of the display sub-unit, 1 pixel displays black; The second grayscale range is divided into four sub-grayscale ranges: Q21, Q22, Q23, and Q24; namely: Q21 [64-79]; Q22 [80-95]; Q23 [96-111]; Q24 [112-127]; When the average grayscale value A1 falls within the Q21 range, all pixels in the 4×4 pixel sub-unit are displayed in red; when the average grayscale value A1 falls within the Q22 range, 10 pixels in the 4×4 pixel sub-unit are displayed in red; when the average grayscale value A1 falls within the Q23 range, 6 pixels in the 4×4 pixel sub-unit are displayed in red; when the average grayscale value A1 falls within the Q24 range, 1 pixel in the 4×4 pixel sub-unit is displayed in red. The third grayscale range is divided into four sub-grayscale ranges: Q31, Q32, Q33, and Q34; namely: Q31 [128-143]; Q32 [144-159]; Q33 [160-175]; Q34 [176-191]; When the average grayscale value A1 falls within the Q21 range, all pixels in the 4×4 pixel sub-unit will display yellow; when the average grayscale value A1 falls within the Q22 range, 10 pixels in the 4×4 pixel sub-unit will display yellow; when the average grayscale value A1 falls within the Q23 range, 6 pixels in the 4×4 pixel sub-unit will display yellow; when the average grayscale value A1 falls within the Q24 range, 1 pixel in the 4×4 pixel sub-unit will display yellow. The fourth grayscale range is divided into four sub-ranges: Q41, Q42, Q43, and Q44; namely: Q41 [192-207]; Q42 [208-223]; Q43 [224-239]; Q44 [240-255]; When the average grayscale value A1 falls into the Q41 range, all pixels in the 4×4 pixel sub-unit are displayed as white; when the average grayscale value A1 falls into the Q42 range, 10 pixels in the 4×4 pixel sub-unit are displayed as white; when the average grayscale value A1 falls into the Q43 range, 6 pixels in the 4×4 pixel sub-unit are displayed as white. The average grayscale value A1 falls within the Q44 range, and in the 4×4 pixels of the display sub-unit, one pixel displays white.

2. The four-color electronic paper display data conversion method according to claim 1, characterized in that, The colors include blue, white, red, and green.

3. The four-color electronic paper display data conversion method according to claim 1, characterized in that, In the first grayscale range, a grayscale average value A1 of 0 indicates the darkest color, and all pixels in the 4×4 pixels of the display sub-unit are displayed as black. A grayscale average value of A1 of 63 indicates that the black is relatively light; within the 4×4 pixels of the display sub-unit, some areas are displayed as black. In the second grayscale range, the average grayscale value A1 is 64, indicating the reddest color. In this case, all 4×4 pixels of the display sub-unit will be red. A grayscale average value of A1 of 127 indicates a lighter gray level; Within the 4×4 pixels of the display sub-unit, a portion is shown in red; In the third grayscale range, the average grayscale value A1 is 128, indicating the yellowest color. In this case, all 4×4 pixels of the display sub-unit will be yellow. A grayscale average value of A1 of 191 indicates a relatively light gray level. Within the 4×4 pixels of the display sub-unit, a portion is shown in yellow; In the fourth grayscale range, the average grayscale value A1 is 192, which indicates the whitest color. In this case, all 4×4 pixels of the display sub-unit will be white. The average grayscale value A1 is 255, which is relatively light; in the 4×4 pixels of the display sub-unit, some parts are white.

4. A four-color electronic paper display data mapping method, characterized in that, One display color for electronic paper, establishing 4 grayscale units; Each grayscale unit includes M pixel units; The grayscale unit includes grayscale unit K1, grayscale unit K2, grayscale unit K3, and grayscale unit K4; Gray unit K1 includes M1 color pixels; Gray unit K2 includes M2 color pixels; Grayscale unit K3 includes M3 color pixels; Gray unit K4 includes M4 color pixels; M1 is greater than M2, M2 is greater than M3, M3 is greater than M4; The image is divided into display sub-units of W pixels, and the average gray level of the pixels in the display sub-unit corresponds to one gray level unit of the four colors; The grayscale data is obtained based on the four-color electronic paper display data conversion method described in claim 1.

5. The four-color electronic paper display data mapping method according to claim 4, characterized in that, Includes any one of the following technical features: TA10: The electronic paper displays four colors: black, red, yellow, and white; TA20: The electronic paper displays four colors: blue, white, red, and green. TA30: W represents N×N pixels, where N is a natural number; TA40: The M1, M2, M3, and M4 color pixels are evenly distributed in the corresponding grayscale unit space; TA50: The W value is equal to the M value, and the W value is 16.

6. A method for displaying full-color electronic paper, characterized in that, Based on the data format conversion method according to any one of claims 1 to 3, the pixel data format in the image to be displayed is converted into a full-color electronic paper image format.

7. A full-color electronic paper display device, characterized in that, The method described in claim 6 is shown.

Images