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

Abstract

The invention discloses a four-color electronic paper display data conversion, mapping and display method and device. The method comprises the following steps: converting picture data into gray data; each display subunit comprises N * N pixel points; the interval of the gray scale data is divided into four gray scale intervals; one gray interval corresponds to one color of the electronic paper; calculating the gray average value A1 of the N * N pixel points of the display subunits; and if the gray average value A1 is judged to fall into the corresponding gray interval range, the display subunit displays the color corresponding to the gray interval. For one display color of the electronic paper, four gray scale units are established; each gray scale unit comprises M pixel units; the gray scale unit comprises gray scale units K1 to K4, and each gray scale unit comprises M1 to M4 color developing pixels; m1 is greater than M2, M2 is greater than M3, and M3 is greater than M4; the standard image is divided into display subunits according to W pixel units, and the gray average value of pixels in the display subunits corresponds to one gray unit in four colors.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a four-color electronic paper display data conversion and mapping and display method and device. Background Art

[0002] E-paper has the characteristics of ultra-low power consumption, paper-like texture, and visibility in sunlight. It is widely used in industries such as retail, education, medical care, and advertising. It saves various resources while improving the level of intelligence in the industry. For example, in the retail industry, using electronic price tags to replace traditional paper labels can effectively save labor costs.

[0003] Currently, common ink screens include black and white screens; there are also color electronic paper ink screens, such as black, red, yellow, and white or blue, white, red, and green four-color electronic paper. Images need to be processed and converted into fewer colors to be better displayed on electronic ink screens. End customers have higher and higher requirements for the display effect of electronic paper, hoping that the display effect will be more realistic.

[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 directly display four colors, which will make the screen color display monotonous; how to solve the above problem and make the color display have richer levels is a technical problem to be solved. Summary of the invention

[0005] In order to solve the problem in the prior art that fewer colors and directly displaying four colors will make the screen color display single, a four-color electronic paper display data conversion and mapping and display method and device are provided to make the display color levels of the entire picture fuller.

[0006] The technical solution of the present application to solve the above-mentioned technical problems is a four-color electronic paper display data conversion method, which takes a color picture in a standard picture format to obtain picture data; converts the picture data into grayscale data; divides the picture into display subunits, each display subunit includes N×N pixels; the interval of grayscale data is divided into four grayscale intervals; one grayscale interval corresponds to one color of the electronic paper; calculates the grayscale average value A1 of the N×N pixels of the display subunit; determines the grayscale interval range into which the grayscale average value A1 falls; if it falls into the corresponding grayscale interval range, the display subunit displays the color corresponding to the grayscale interval.

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

[0008] Colors include blue, white, red, green.

[0009] Among the N×N pixels, N is 4, and the display sub-unit size is 4×4.

[0010] In the first grayscale interval, a grayscale average value A1 of 0 indicates the darkest color, and all 4×4 pixels of the display subunit are displayed in black; a grayscale average value A1 of 63 indicates a lighter black color, and some 4×4 pixels of the display subunit are displayed in black.

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

[0012] In the third grayscale interval, the grayscale average value A1 of 128 indicates the yellowest color, and all of the 4×4 pixels of the display subunit display yellow; the grayscale average value A1 of 191 indicates a lighter color, and some of the 4×4 pixels of the display subunit display yellow.

[0013] In the fourth grayscale interval, the grayscale average value A1 of 192 indicates the whitest, and all 4×4 pixels of the display subunit are displayed in white; the grayscale average value A1 of 255 is lighter, and some 4×4 pixels of the display subunit are displayed in white.

[0014] The first grayscale interval is divided into 4 grayscale sub-intervals Q11, Q12, Q13, and Q14, which are respectively: Q11[0-15]; Q12[16-31]; Q13[32-47]; Q14[48-63]; when the grayscale average value A1 falls into the Q11 interval, all 4×4 pixels of the display subunit are displayed in black; when the grayscale average value A1 falls into the Q12 interval, 10 pixels of the 4×4 pixels of the display subunit are displayed in black; when the grayscale average value A1 falls into the Q13 interval, 6 pixels of the 4×4 pixels of the display subunit are displayed in black; when the grayscale average value A1 falls into the Q14 interval, 1 pixel of the 4×4 pixels of the display subunit is displayed in black.

[0015] The second grayscale interval is divided into 4 grayscale sub-intervals Q21, Q22, Q23, and Q24, which are respectively: Q21[64-79]; Q22[80-95]; Q23[96-111]; Q24[112-127]; when the grayscale average value A1 falls into the Q21 interval, all of the 4×4 pixels of the display subunit are displayed in red; when the grayscale average value A1 falls into the Q22 interval, 10 of the 4×4 pixels of the display subunit are displayed in red; when the grayscale average value A1 falls into the Q23 interval, 6 of the 4×4 pixels of the display subunit are displayed in red; when the grayscale average value A1 falls into the Q24 interval, 1 of the 4×4 pixels of the display subunit is displayed in red.

[0016] The third grayscale interval is divided into 4 grayscale sub-intervals Q31, Q32, Q33, and Q34, which are: Q31[128-143]; Q32[144-159]; Q33[160-175]; Q34[176-191]; the grayscale average value A1 falls into the Q21 interval, and all 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q22 interval, and 10 pixels of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q23 interval, and 6 pixels of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q24 interval, and 1 pixel of the 4×4 pixels of the display subunit is displayed in yellow.

[0017] The fourth grayscale interval is divided into 4 grayscale sub-intervals Q41, Q42, Q43, and Q44, respectively: Q41[192-207]; Q42[208-223]; Q43[224-239]; Q44[240-255]; when the grayscale average value A1 falls into the Q41 interval, all 4×4 pixels of the display subunit are displayed in white; when the grayscale average value A1 falls into the Q42 interval, 10 pixels of the 4×4 pixels of the display subunit are displayed in white; when the grayscale average value A1 falls into the Q43 interval, 6 pixels of the 4×4 pixels of the display subunit are displayed in white; when the grayscale average value A1 falls into the Q44 interval, 1 pixel of the 4×4 pixels of the display subunit is displayed in white.

[0018] The technical solution of the present application to solve the above-mentioned technical problems can also be a four-color electronic paper display data mapping method, wherein four grayscale units are established for one display color of the electronic paper; each grayscale unit includes M pixel units; the grayscale units include grayscale unit K1, grayscale unit K2, grayscale unit K3, and grayscale unit K4; the grayscale unit K1 includes M1 color-developing pixels; the grayscale unit K2 includes M2 color-developing pixels; the grayscale unit K3 includes M3 color-developing pixels; the grayscale unit K4 includes M4 color-developing 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 grayscale average value of the pixels in the display sub-unit corresponds to one grayscale unit among the four colors.

[0019] Four-color electronic paper display data mapping method, the electronic paper has four display colors, namely black, red, yellow and white.

[0020] Four-color electronic paper display data mapping method, the electronic paper has four display colors, namely blue, white, red and green.

[0021] It can be that 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 can be that the W value is equal to the M value, and W is equal to 16.

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

[0025] The technical solution of the present application to solve the above technical problem can also be a full-color electronic paper display device, which is displayed based on the above method.

[0026] One of the beneficial effects of the technical solution in the present application is that a grayscale range corresponds to a color, so that each color on the electronic paper can correspond to a grayscale value range, and then according to the specific grayscale value of the grayscale value range, the color is expressed in more delicate multiple levels.

[0027] One of the beneficial effects of the technical solution in the present application is that the color can be expressed into multiple more delicate levels according to the specific grayscale values ​​in the grayscale value interval; such a corresponding relationship 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 the present application is that four grayscale intervals correspond to four colors, and more colors or different types of color intervals can be matched according to the characteristics of different electronic papers.

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

[0030] One of the beneficial effects of the technical solution in the present application is that each grayscale interval is further divided into four sub-intervals, further enriching the color level.

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

[0032] One of the beneficial effects of the technical solution in the present application is that the color display pixels M1, M2, M3, and M4 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 the present application is that the W value is equal to the M value, which is equal to 16, which is very suitable for the integer segmentation of the conventional 256 data range, making it easier to establish a mapping relationship, simplifying the calculation process and saving computing power. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0037] Figure 4 It is a schematic diagram of data conversion during the conversion process;

[0038] Figure 5 It is a schematic diagram of the interval of the grayscale average value;

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

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

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

[0042] Fig. 9 It is a schematic diagram showing that the grayscale average value falls into different grayscale sub-intervals;

[0043] Fig.10 It is a schematic diagram of color pixels showing that the grayscale average value of the subunit falls into different grayscale sub-intervals. DETAILED DESCRIPTION

[0044] The implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings.

[0045] It should be noted that the following is a description of the preferred embodiments of the present application, which does not constitute any limitation to the present application. The description of the preferred embodiments of the present application is only an explanation of the general principles of the present application. The embodiments described in this application are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and technical features numbered with Arabic numerals 1, 2, 3, etc., and numbers such as "A" and "B", are only used for descriptive purposes and are only for the convenience of explanation, and do not represent a sequential relationship in time or space; they cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and numbered with Arabic numerals 1, 2, 3, etc. may explicitly or implicitly include one or more of the features. In the description of the present application, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0047] like Figures 1 to 3 A four-color electronic paper display data conversion method takes a color picture in a standard picture format and obtains picture data. Figure 2 , convert the image data into grayscale data.

[0048] like Figure 3 and Figure 4 , divide the image into display sub-units, each display sub-unit includes N×N pixels; divide the image into 4×4 display sub-units, and calculate the average grayscale data value of 16 pixels; divide the grayscale data interval into four grayscale intervals; one grayscale interval corresponds to a color of the electronic paper; calculate the grayscale average value A1 of the N×N pixels of the display sub-unit; determine the grayscale interval range into which the grayscale average value A1 falls; if it falls into the corresponding grayscale interval range, the display sub-unit displays the color corresponding to the grayscale interval.

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

[0050] In other embodiments, the colors of the electronic paper include blue, white, red, and green.

[0051] like Figure 7, among N×N pixels, N is 4, and the display subunit size is 4×4.

[0052] like Figures 6 to 9 In the first grayscale interval, the grayscale average value A1 of 0 indicates the darkest, and all 4×4 pixels of the display subunit are displayed in black; the grayscale average value A1 of 63 indicates that the black is lighter; and some of the 4×4 pixels of the display subunit are displayed in black.

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

[0054] like Figures 6 to 9 In the third grayscale interval, the grayscale average value A1 of 128 indicates the yellowest color, and all of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 of 191 indicates a lighter color; and some of the 4×4 pixels of the display subunit are displayed in yellow.

[0055] like Figures 6 to 9 In the fourth grayscale interval, the grayscale average value A1 is 192, which indicates the whitest color. All 4×4 pixels of the display subunit are displayed in white. The grayscale average value A1 is 255, which indicates a lighter color. Some 4×4 pixels of the display subunit are displayed in white.

[0056] like Figure 8 , the first grayscale interval is divided into 4 grayscale sub-intervals Q11, Q12, Q13, and Q14; respectively: Q11 [0-15]; Q12 [16-31]; Q13 [32-47]; Q14 [48-63]; the grayscale average value A1 falls into the Q11 interval, and all 4×4 pixels of the display subunit are displayed in black; the grayscale average value A1 falls into the Q12 interval, and 10 pixels of the 4×4 pixels of the display subunit are displayed in black; the grayscale average value A1 falls into the Q13 interval, and 6 pixels of the 4×4 pixels of the display subunit are displayed in black; the grayscale average value A1 falls into the Q14 interval, and 1 pixel of the 4×4 pixels of the display subunit is displayed in black. If the grayscale average value A1 = 40; it falls into the 32-47 interval.

[0057] like Figure 7, the second grayscale interval is divided into 4 grayscale sub-intervals Q21, Q22, Q23, and Q24; respectively: Q21 [64-79]; Q22 [80-95]; Q23 [96-111]; Q24 [112-127]; the grayscale average value A1 falls into the Q21 interval, and all 4×4 pixels of the display subunit are displayed in red; the grayscale average value A1 falls into the Q22 interval, and 10 pixels of the 4×4 pixels of the display subunit are displayed in red; the grayscale average value A1 falls into the Q23 interval, and 6 pixels of the 4×4 pixels of the display subunit are displayed in red; the grayscale average value A1 falls into the Q24 interval, and 1 pixel of the 4×4 pixels of the display subunit is displayed in red. If the grayscale average value A1 = 64; it falls into the 64-127 interval.

[0058] like Figure 6 , the third grayscale interval is divided into 4 grayscale sub-intervals Q31, Q32, Q33, and Q34, respectively: Q31 [128-143]; Q32 [144-159]; Q33 [160-175]; Q34 [176-191]; the grayscale average value A1 falls into the Q21 interval, and all 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q22 interval, and 10 pixels of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q23 interval, and 6 pixels of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q24 interval, and 1 pixel of the 4×4 pixels of the display subunit is displayed in yellow. If the grayscale average value A1 = 130; it falls into the 128-191 interval.

[0059] like Fig.10 , if the grayscale average value A1=130; it falls within the interval of 128-191, then in the 4×4 pixel display subunit, all 16 pixels display yellow. If the grayscale average value falls within the interval of 144-159, then in the 4×4 pixel display subunit, 10 pixels display yellow. If the grayscale average value falls within the interval of 160-175, then in the 4×4 pixel display subunit, 6 pixels display yellow. If the grayscale average value falls within the interval of 176-191, then in the 4×4 pixel display subunit, 1 pixel displays yellow. The number of pixels can be set in steps. The threshold limits of Q31, Q32, Q33, and Q34 can also be set or adjusted.

[0060] like Fig. 9, the fourth grayscale interval is divided into 4 grayscale sub-intervals Q41, Q42, Q43, and Q44, respectively: Q41 [192-207]; Q42 [208-223]; Q43 [224-239]; Q44 [240-255]; the grayscale average value A1 falls into the Q41 interval, and all 4×4 pixels of the display subunit are displayed in white; the grayscale average value A1 falls into the Q42 interval, and 10 pixels of the 4×4 pixels of the display subunit are displayed in white; the grayscale average value A1 falls into the Q43 interval, and 6 pixels of the 4×4 pixels of the display subunit are displayed in white; the grayscale average value A1 falls into the Q44 interval, and 1 pixel of the 4×4 pixels of the display subunit is displayed in white. If the grayscale average value A1 = 208, it falls into the 208-223 interval.

[0061] like Fig.10 , a four-color electronic paper display data mapping method, a display color of the electronic paper, establishes 4 grayscale units; 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; it can be that M1, M2, M3, and M4 color pixels are evenly distributed in the corresponding grayscale unit space.

[0062] The standard image is divided into display sub-units according to W pixel units, where W is N×N pixels and N is a natural number. Fig.10 In the example, W is 16. The grayscale average value of the pixels in the display subunit corresponds to one grayscale unit among the four colors. It can be that the W value is equal to the M value, and W is equal to 16.

[0063] Four-color electronic paper display data mapping method, the electronic paper has 4 display colors, namely black, red, yellow, and white. Four-color electronic paper display data mapping method, the electronic paper has 4 display colors, namely blue, white, red, and green.

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

[0065] The technical solution of the present application to solve the above technical problem can also be a full-color electronic paper display device, which is displayed based on the above method.

[0066] As shown in the accompanying drawings, the above are only embodiments of the present application, and the patent scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the invention description and the accompanying drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A four-color electronic paper display data conversion method, characterized in that: Take a color picture in a standard picture format and obtain picture data; Convert the image data into grayscale data; Divide the image into display sub-units, each display sub-unit includes N×N pixels; The interval of grayscale data is divided into four grayscale intervals; One grayscale interval corresponds to one color of the electronic paper; Calculate the grayscale average value A1 of N×N pixels of the display subunit; Determine the grayscale interval range that the grayscale average value A1 falls into; If the grayscale range falls within the corresponding range, the display subunit displays the color corresponding to the grayscale range.

2. The four-color electronic paper display data conversion method according to claim 1, characterized in that: The colors of the electronic paper include black, red, yellow and white; The interval of 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.

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

4. The four-color electronic paper display data conversion method according to claim 2, characterized in that: Among the N×N pixel points, N is 4, and the size of the display subunit is 4×4.

5. The four-color electronic paper display data conversion method according to claim 4, characterized in that: In the first grayscale interval, the grayscale average value A1 is 0, indicating the darkest, and all 4×4 pixels of the display subunit are displayed in black; The grayscale average value A1 is 63, indicating that black is lighter; some of the 4×4 pixels of the display subunit display black; In the second grayscale interval, the grayscale average value A1 is 64, indicating the reddest color, and all 4×4 pixels of the display subunit display red; The grayscale average value A1 is 127, which means it is lighter; Some of the 4×4 pixels of the display subunit are displayed in red; In the third grayscale interval, the grayscale average value A1 is 128, indicating the most yellow, and all 4×4 pixels of the display subunit display yellow; The grayscale average value A1 is 191, which means it is lighter; Some of the 4×4 pixels of the display subunit are displayed in yellow; In the fourth grayscale interval, the grayscale average value A1 is 192, indicating the whitest color, and all 4×4 pixels of the display subunit are displayed in white; The grayscale average value A1 is 255 and is relatively light; some of the 4×4 pixels of the display subunit are displayed in white.

6. The four-color electronic paper display data conversion method according to claim 4, characterized in that: The first grayscale interval is divided into four grayscale sub-intervals Q11, Q12, Q13, and Q14, respectively: Q11 [0-15]; Q12 [16-31]; Q13 [32-47]; Q14 [48-63]; The grayscale average value A1 falls into the Q11 interval, and all of the 4×4 pixels of the display subunit are displayed in black; the grayscale average value A1 falls into the Q12 interval, and 10 of the 4×4 pixels of the display subunit are displayed in black; the grayscale average value A1 falls into the Q13 interval, and 6 of the 4×4 pixels of the display subunit are displayed in black; The grayscale average value A1 falls into the Q14 interval, and one pixel among the 4×4 pixels of the display subunit is displayed in black; The second grayscale interval is divided into four grayscale sub-intervals Q21, Q22, Q23, and Q24, respectively: Q21 [64-79]; Q22 [80-95]; Q23 [96-111]; Q24 [112-127]; The grayscale average value A1 falls into the Q21 interval, and all of the 4×4 pixels of the display subunit are displayed in red; the grayscale average value A1 falls into the Q22 interval, and 10 of the 4×4 pixels of the display subunit are displayed in red; the grayscale average value A1 falls into the Q23 interval, and 6 of the 4×4 pixels of the display subunit are displayed in red; the grayscale average value A1 falls into the Q24 interval, and 1 of the 4×4 pixels of the display subunit is displayed in red; The third grayscale interval is divided into four grayscale sub-intervals Q31, Q32, Q33, and Q34, respectively: Q31 [128-143]; Q32 [144-159]; Q33 [160-175]; Q34 [176-191]; The grayscale average value A1 falls into the Q21 interval, and all of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q22 interval, and 10 of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q23 interval, and 6 of the 4×4 pixels of the display subunit are displayed in yellow; the grayscale average value A1 falls into the Q24 interval, and 1 of the 4×4 pixels of the display subunit is displayed in yellow; The fourth grayscale interval is divided into four grayscale sub-intervals Q41, Q42, Q43, and Q44, respectively: Q41 [192-207]; Q42 [208-223]; Q43 [224-239]; Q44 [240-255]; The grayscale average value A1 falls into the Q41 interval, and all of the 4×4 pixels of the display subunit are displayed in white; the grayscale average value A1 falls into the Q42 interval, and 10 of the 4×4 pixels of the display subunit are displayed in white; the grayscale average value A1 falls into the Q43 interval, and 6 of the 4×4 pixels of the display subunit are displayed in white; The grayscale average value A1 falls into the Q44 interval, and one pixel among the 4×4 pixels of the display subunit displays white.

7. A four-color electronic paper display data mapping method, characterized in that: One display color of the electronic paper, establish 4 grayscale units; Each grayscale unit includes M pixel units; The grayscale units include grayscale unit K1, grayscale unit K2, grayscale unit K3, and grayscale unit K4; The grayscale unit K1 includes M1 color pixels; The grayscale unit K2 includes M2 color pixels; Grayscale unit K3 includes M3 color pixels; The grayscale 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 according to W pixel units, and the grayscale average value of the pixels in the display sub-unit corresponds to one grayscale unit among the four colors.

8. The four-color electronic paper display data mapping method according to claim 1, characterized in that: Include any of the following technical features: TA10: The electronic paper has four display colors: black, red, yellow, and white; TA20: The electronic paper has four display colors: blue, white, red, and green; TA30: W is 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 is equal to 16.

9. A full-color electronic paper display method, characterized in that: Based on the data format conversion method described in any one of claims 1 to 8, the pixel data format in the image to be displayed is converted into a full-color electronic paper image format.

10. A full-color electronic paper display device, characterized in that: The method according to claim 9 is shown.

Images