Color electronic paper display device

Abstract

The utility model discloses a color electronic paper display device which comprises a first transparent substrate, a second transparent substrate arranged opposite to the first transparent substrate and a plurality of retaining walls arranged between the first transparent substrate and the second transparent substrate, and the retaining walls divide a gap between the first transparent substrate and the second transparent substrate into a plurality of containing cavities. Each accommodating cavity corresponds to one sub-pixel, and charged ink particles are arranged in the accommodating cavities; a first side electrode and a second side electrode are arranged on the retaining walls on the two opposite sides of each containing cavity respectively, and the first side electrodes and the second side electrodes are used for controlling the motion state of the charged ink particles in the containing cavities; a colored reflective material layer is arranged on the second transparent substrate and is used for reflecting light rays with corresponding colors to one side of the first transparent substrate. The color reflective material layer is arranged on the second transparent substrate, so that color light can be reflected to one side of the first transparent substrate, and the color electronic paper display device can realize color display by reflecting ambient light.

Description

Technical Field

[0001] The utility model relates to the technical field of displays, in particular to a color electronic paper display device. Background Art

[0002] The display panel has the advantages of being thin, light, durable, and energy-saving and environmentally friendly with low power consumption. The electronic ink screen has become a display that meets the needs of the public. The electronic ink screen can use external light sources to display images, unlike LCD displays that require backlight sources. Therefore, in outdoor environments with strong sunlight, the information on the electronic ink screen can still be clearly seen without the problem of viewing angle. It is now widely used in e-readers (such as e-books, e-newspapers) or other electronic components (such as price tags).

[0003] Existing electronic ink screens usually use E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, cholesteric liquid crystal display (CLCD) technology, micro-electromechanical system (MEMS) technology or electrowetting technology. However, existing conventional electronic ink screens can only display black and white images, not color images. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a color electronic paper display device to solve the problem that the electronic paper in the prior art cannot display color images.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] The utility model provides a color electronic paper display device, comprising a first transparent substrate, a second transparent substrate arranged opposite to the first transparent substrate, and a plurality of retaining walls arranged between the first transparent substrate and the second transparent substrate, wherein the retaining walls divide the gap between the first transparent substrate and the second transparent substrate into a plurality of accommodating cavities, each of the accommodating cavities corresponds to a sub-pixel, and each of the accommodating cavities is provided with charged ink particles;

[0007] The retaining walls on opposite sides of each of the accommodating cavities are respectively provided with a first side electrode and a second side electrode, wherein the first side electrode and the second side electrode are used to control the movement state of the charged ink particles in the accommodating cavity;

[0008] A colored reflective material layer is disposed on the second transparent substrate, and the colored reflective material layer is used to reflect light of a corresponding color toward the first transparent substrate.

[0009] Furthermore, the colored reflective material layer includes a first color reflective material layer disposed on the entire surface, and the first color reflective material layer can reflect light of a first color;

[0010] The multiple sub-pixels include a first sub-pixel and a second sub-pixel. The first sub-pixel corresponds to the charged ink particles in the accommodating cavity, including black ink particles and second color reflective particles. The black ink particles and the second color reflective particles have opposite charges, and the second color reflective particles can reflect light of a second color. The second sub-pixel corresponds to the charged ink particles in the accommodating cavity, including black ink particles and third color reflective particles. The black ink particles and the third color reflective particles have opposite charges, and the third color reflective particles can reflect light of a third color.

[0011] Furthermore, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel and a third sub-pixel, the colored reflective material layer includes a first color reflective material layer corresponding to the first sub-pixel, a second color reflective material layer corresponding to the second sub-pixel and a third color reflective material layer corresponding to the third sub-pixel, the first color reflective material layer can reflect light of a first color, the second color reflective material layer can reflect light of a second color, and the third color reflective material layer can reflect light of a third color.

[0012] Furthermore, the charged ink particles in all the containing cavities include black ink particles and white ink particles, the black ink particles and the white ink particles carry opposite charges, and the white ink particles can reflect white light.

[0013] Furthermore, the first color reflective material layer, the second color reflective material layer and the third color reflective material layer are all provided with light focusing grooves on the side facing the first transparent substrate, and the light focusing grooves are used to focus the reflected light.

[0014] Furthermore, the second transparent substrate is further provided with a light-absorbing side wall which separates the first color reflective material layer, the second color reflective material layer and the third color reflective material layer from each other.

[0015] Furthermore, a reflective structure corresponding to the light-absorbing side wall is provided on the second transparent substrate. The cross-section of the reflective structure is an inverted triangle structure and is used to reflect the reflected light reflected by the colored reflective material layer to the colored reflective material layer for reuse.

[0016] Furthermore, a light-absorbing bottom plate is disposed on the second transparent substrate, and the light-absorbing bottom plate is located between the colored reflective material layer and the second transparent substrate;

[0017] Alternatively, a reflective bottom plate is disposed on the second transparent substrate in its entirety, and the reflective bottom plate is located between the colored reflective material layer and the second transparent substrate.

[0018] Furthermore, the first color, the second color and the third color are respectively one of red, green and blue, and the first color, the second color and the third color are different.

[0019] Furthermore, a black matrix corresponding to the retaining wall is provided on the first transparent substrate, and the width of the black matrix lines is greater than the sum of the widths of the retaining wall, the first side electrode and the second side electrode;

[0020] And / or, a plurality of mutually independent signal electrodes are provided on the second transparent substrate, the first side electrode and the second side electrode are respectively conductively connected to the corresponding signal electrodes, and the signal electrodes are used to apply corresponding electrical signals to the first side electrode and the second side electrode.

[0021] The beneficial effect of the utility model is that a colored reflective material layer is arranged on the second transparent substrate, so that colored light can be reflected toward the side of the first transparent substrate, and then the movement state of the charged ink particles in the accommodating cavity is controlled by the first side electrode and the second side electrode, so as to control the reflected colored light to be emitted from the first transparent substrate, so that the colored electronic paper display device realizes color display by reflecting ambient light. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the color electronic paper display device in the first embodiment of the present utility model in the initial state;

[0023] Figure 2 is a schematic structural diagram of the color electronic paper display device in the first embodiment of the present utility model in a black state;

[0024] Figure 3 This is a schematic structural diagram of the color electronic paper display device in the first embodiment of the present utility model when displaying a red picture;

[0025] Figure 4 This is a schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model when displaying a green picture;

[0026] Figure 5 This is a schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model when displaying a blue picture;

[0027] Figure 6 It is a structural schematic diagram of the color electronic paper display device in the first embodiment of the utility model when displaying a color pattern;

[0028] Figure 7 This is one of the structural schematic diagrams of the color electronic paper display device in the initial state in the second embodiment of the present utility model;

[0029] Figure 8 This is the second structural schematic diagram of the color electronic paper display device in the initial state in the second embodiment of the present utility model;

[0030] Fig. 9 is a schematic structural diagram of the color electronic paper display device in the initial state in the third embodiment of the present utility model;

[0031] Fig.10 is a schematic structural diagram of the color electronic paper display device in the third embodiment of the present utility model in the black state;

[0032] Fig.11 This is a schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a red picture;

[0033] Fig.12 This is a schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a green picture;

[0034] Fig.13 This is a schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a blue picture;

[0035] Fig.14 This is a schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a color pattern;

[0036] Fig.15 This is a schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a black and white pattern;

[0037] Fig.16 It is a structural schematic diagram of the color electronic paper display device in the fourth embodiment of the present utility model in the initial state. DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the present invention, the specific implementation, structure, features and effects of the color electronic paper display device proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0039] [Example 1]

[0040] Figure 1 Schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present invention in the initial state. Figure 1As shown, a color electronic paper display device provided in Embodiment 1 of the present invention includes a first transparent substrate 10, a second transparent substrate 20 arranged opposite to the first transparent substrate 10, and a plurality of retaining walls 30 arranged between the first transparent substrate 10 and the second transparent substrate 20. The retaining walls 30 separate the gap between the first transparent substrate 10 and the second transparent substrate 20 into a plurality of accommodating cavities 101, each accommodating cavity 101 corresponds to a sub-pixel, and each accommodating cavity 101 is provided with charged ink particles 40.

[0041] A first side electrode 31 and a second side electrode 32 are respectively disposed on the retaining walls 30 on opposite sides of each accommodating cavity 101 . The first side electrode 31 and the second side electrode 32 are used to control the movement state of the charged ink particles 40 in the accommodating cavity 101 .

[0042] A colored reflective material layer is disposed on the second transparent substrate 20 , and the colored reflective material layer is used to reflect light of a corresponding color toward the first transparent substrate 10 .

[0043] In the present application, a colored reflective material layer is arranged on the second transparent substrate 20, so that the colored light can be reflected toward the side of the first transparent substrate 10, and then the movement state of the charged ink particles 40 in the accommodating cavity 101 is controlled by the first side electrode 31 and the second side electrode 32, so as to control the reflected colored light to be emitted from the first transparent substrate 10, so that the color electronic paper display device realizes color display by reflecting ambient light.

[0044] In this embodiment, the colored reflective material layer includes a first color reflective material layer 22 disposed on the entire surface, and the first color reflective material layer 22 can reflect light of a first color.

[0045] The plurality of sub-pixels include first sub-pixels and second sub-pixels, that is, the plurality of sub-pixels are composed of two types of sub-pixels. Any two first sub-pixels are separated by the second sub-pixels, and any two second sub-pixels are separated by the first sub-pixels, so that the first sub-pixels and the second sub-pixels are arranged in a mosaic manner to increase the display effect.

[0046] The charged ink particles 40 in the first sub-pixel corresponding to the receiving cavity 101 include black ink particles 41 and second color reflective particles 42, the black ink particles 41 and the second color reflective particles 42 have opposite charges, and the second color reflective particles 42 can reflect the light of the second color. The charged ink particles 40 in the second sub-pixel corresponding to the receiving cavity 101 include black ink particles 41 and third color reflective particles 43, the black ink particles 41 and the third color reflective particles 43 have opposite charges, and the third color reflective particles 43 can reflect the light of the third color. Among them, the black ink particles 41 are negatively charged, and the second color reflective particles 42 and the third color reflective particles 43 are both positively charged; of course, the black ink particles 41 can also be positively charged, and the second color reflective particles 42 and the third color reflective particles 43 are both negatively charged, but the electrical signals applied to the first side electrode 31 and the second side electrode 32 need to be adjusted accordingly. Since the charged ink particles 40 in each receiving cavity 101 are single-color reflective particles, there is no afterimage problem, so that the screen switching is smoother.

[0047] Furthermore, the first color, the second color and the third color are respectively one of red, green and blue, and the first color, the second color and the third color are different. In this embodiment, the first color is blue (B), the second color is red (R), and the third color is green (G), that is, the first color reflective material layer 22 is a blue reflective material layer and reflects blue light, the second color reflective particles 42 are red reflective particles and reflect red light, and the third color reflective particles 43 are green reflective particles and reflect green light.

[0048] In this embodiment, a black matrix 11 corresponding to the retaining wall 30 is provided on the first transparent substrate 10, and the width of the lines of the black matrix 11 is greater than the sum of the widths of the retaining wall 30, the first side electrode 31 and the second side electrode 32. Therefore, when the reflective particles (the second color reflective particles 42 and the third color reflective particles 43) move to the surface of the first side electrode 31 and the second side electrode 32, the black matrix 11 can block the reflection at the edge of the sub-pixel to prevent the problem of color mixing and improve the color saturation.

[0049] Furthermore, a plurality of mutually independent signal electrodes 21 are provided on the second transparent substrate 20, and the first side electrode 31 and the second side electrode 32 are respectively conductively connected to the corresponding signal electrode 21, and the signal electrode 21 is used to apply corresponding electrical signals to the first side electrode 31 and the second side electrode 32, and each signal electrode 21 can independently apply an electrical signal to the corresponding first side electrode 31 or the second side electrode 32. The signal electrode 21 is provided on the side of the colored reflective material layer facing the accommodating cavity 101, so as to facilitate the conductive connection between the first side electrode 31 and the second side electrode 32 and the corresponding signal electrode 21.

[0050] The first transparent substrate 10 and the second transparent substrate 20 can be made of transparent substrates such as glass, acrylic and polycarbonate. The first side electrode 31 and the second side electrode 32 can be made of metal, such as copper, aluminum, molybdenum and other metals with good conductivity. The signal electrode 21 can be made of transparent conductive materials, such as indium tin oxide (ITO) or indium zinc oxide (IZO), so as to avoid affecting the light reflected by the color reflective material layer.

[0051] Figure 2 Schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model in the black state. Figure 2 As shown, when the color electronic paper display device is in the black state, all the first side electrodes 31 and the second side electrodes 32 are applied with negative polarity electric signals, the second color reflective particles 42 and the third color reflective particles 43 with positive charges are adsorbed on the surfaces of the first side electrodes 31 and the second side electrodes 32, and the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the entire color electronic paper display device appears black. Of course, in other embodiments, no electric signal may be applied to the first side electrode 31 and the second side electrode 32, the black ink particles 41, the second color reflective particles 42 and the third color reflective particles 43 are dispersed in the accommodating cavity 10, but the second color reflective particles 42 and the third color reflective particles 43 will have a small amount of reflected light, and the effect of the black state is poor, that is, the contrast is low.

[0052] Figure 3 Schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model when displaying a red picture. Figure 3 As shown, when the color electronic paper display device displays a red picture, a positive polarity electric signal is applied to the first side electrode 31 and the second side electrode 32 corresponding to the first sub-pixel, and the negatively charged black ink particles 41 are adsorbed on the surface of the first side electrode 31 and the second side electrode 32, while the positively charged second color reflective particles 42 are dispersed in the accommodating cavity 10 to reflect the light of the second color, that is, red light, so that the first sub-pixel appears red. A negative polarity electric signal is applied to the first side electrode 31 and the second side electrode 32 corresponding to the second sub-pixel, and the positively charged third color reflective particles 43 are adsorbed on the surface of the first side electrode 31 and the second side electrode 32, while the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the second sub-pixel appears black. Therefore, when the first sub-pixel appears red and the second sub-pixel appears black, the entire color electronic paper display device appears red.

[0053] Figure 4 Schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model when displaying a green picture. Figure 4As shown, when the color electronic paper display device displays a green picture, a positive polarity electric signal is applied to the first side electrode 31 and the second side electrode 32 corresponding to the second sub-pixel, and the negatively charged black ink particles 41 are adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, while the positively charged third color reflective particles 43 are dispersed in the accommodating cavity 10 to reflect the light of the third color, that is, reflect the green light, so that the second sub-pixel appears green. A negative polarity electric signal is applied to the first side electrode 31 and the second side electrode 32 corresponding to the first sub-pixel, and the positively charged second color reflective particles 42 are adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, while the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the first sub-pixel appears black. Therefore, when the second sub-pixel appears green and the first sub-pixel appears black, the entire color electronic paper display device appears green.

[0054] Figure 5 Schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model when displaying a blue picture. Figure 5 As shown, when the color electronic paper display device displays a blue picture, electric signals of opposite polarities are applied to all first side electrodes 31 and second side electrodes 32, for example, electric signals of positive polarity are applied to all first side electrodes 31, and electric signals of negative polarity are applied to all second side electrodes 32. The positively charged second color reflective particles 42 and third color reflective particles 43 are adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are adsorbed on the surface of the first side electrode 31, so that the accommodating cavity 101 is transparent, and the ambient light passes through the accommodating cavity 101 and is reflected by the first color reflective material layer 22, thereby reflecting the first color (blue) light, so that all sub-pixels appear blue, and therefore, the entire color electronic paper display device appears blue.

[0055] Figure 6 Schematic diagram of the structure of the color electronic paper display device in the first embodiment of the present utility model when displaying a color pattern. Figure 6As shown, when the color electronic paper display device displays a color pattern, in the corresponding sub-pixels (first sub-pixel and second sub-pixel) displaying black, the corresponding first side electrode 31 and the second side electrode 32 are both applied with negative polarity electric signals, and the positively charged second color reflective particles 42 or third color reflective particles 43 are both adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, while the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the corresponding sub-pixel appears black. In the corresponding first sub-pixel displaying red, the corresponding first side electrode 31 and the second side electrode 32 are both applied with positive polarity electric signals, and the negatively charged black ink particles 41 are adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, while the positively charged second color reflective particles 42 are dispersed in the accommodating cavity 10 to reflect the light of the second color, that is, reflect the red light, so that the corresponding first sub-pixel appears red. In the second sub-pixel corresponding to the green display, the corresponding first side electrode 31 and the second side electrode 32 are both applied with positive polarity electric signals, the negatively charged black ink particles 41 are adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, and the positively charged third color reflective particles 43 are dispersed in the accommodating cavity 10 to reflect the third color light, that is, reflect green light, so that the corresponding second sub-pixel appears green. In the sub-pixels corresponding to the blue display (first sub-pixel, second sub-pixel), the corresponding first side electrode 31 and the second side electrode 32 are both applied with electric signals of opposite polarity, for example, the first side electrode 31 is both applied with positive polarity electric signals, and the second side electrode 32 is both applied with negative polarity electric signals. The positively charged second color reflective particles 42 or third color reflective particles 43 are adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are adsorbed on the surface of the first side electrode 31, so that the accommodating cavity 101 is transparent, and the ambient light passes through the accommodating cavity 101 and is reflected by the first color reflective material layer 22, thereby reflecting the first color (blue) light, so that the corresponding sub-pixel appears blue. Under the mutual mixing of red light, green light, and blue light, the color electronic paper display device displays a color pattern. Of course, there are also black areas in the color pattern, and the sub-pixels in the black area appear black.

[0056] Among them, by sharing the first sub-pixel between the first color (blue) and the second color (red), and sharing the second sub-pixel between the first color (blue) and the third color (green), the resolution of the pixel can be increased to improve the display effect.

[0057] [Example 2]

[0058] Figure 7 This is one of the structural schematic diagrams of the color electronic paper display device in the initial state in the second embodiment of the present utility model. Figure 8This is the second structural diagram of the color electronic paper display device in the initial state in the second embodiment of the present utility model. Figure 7 and Figure 8 As shown, the color electronic paper display device provided in the second embodiment of the present invention is different from the color electronic paper display device provided in the first embodiment ( Figures 1 to 6 ) are substantially the same, except that, in this embodiment:

[0059] like Figure 7 As shown, the first color is green (G), the second color is red (R), and the third color is blue (B), that is, the first color reflective material layer 22 is a green reflective material layer and reflects green light, the second color reflective particles 42 are red reflective particles and reflect red light, and the third color reflective particles 43 are blue reflective particles and reflect blue light. Figure 8 As shown, the first color can also be red (R), the second color is blue (B), and the third color is green (G), that is, the first color reflective material layer 22 is a red reflective material layer and reflects red light, the second color reflective particles 42 are blue reflective particles and reflect blue light, and the third color reflective particles 43 are green reflective particles and reflect green light.

[0060] In other embodiments, the first color may also be blue (B), the second color is green (G), and the third color is red (R), that is, the first color reflective material layer 22 is a blue reflective material layer and reflects blue light, the second color reflective material layer 23 is a green reflective material layer and reflects green light, and the third color reflective material layer 24 is a red reflective material layer and reflects red light; the first color is green (G), the second color is blue (B), and the third color is red (R), that is, the first color reflective material layer 22 is a green reflective material layer. The first color reflective material layer 22 is a red reflective material layer and reflects red light, the second color reflective material layer 23 is a blue reflective material layer and reflects blue light, and the third color reflective material layer 24 is a red reflective material layer and reflects red light; or the first color is red (R), the second color is green (G), and the third color is blue (B), that is, the first color reflective material layer 22 is a red reflective material layer and reflects red light, the second color reflective material layer 23 is a green reflective material layer and reflects green light, and the third color reflective material layer 24 is a blue reflective material layer and reflects blue light. Any combination of the first color, the second color, and the third color is one of the three colors of red, green, and blue, and the first color, the second color, and the third color are different, is included in the present application.

[0061] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0062] [Example 3]

[0063] Fig. 9 Schematic diagram of the structure of the color electronic paper display device in the initial state in the third embodiment of the present utility model. Fig. 9 As shown, a color electronic paper display device provided in Embodiment 3 of the present invention comprises a first transparent substrate 10, a second transparent substrate 20 arranged opposite to the first transparent substrate 10, and a plurality of retaining walls 30 arranged between the first transparent substrate 10 and the second transparent substrate 20. The retaining walls 30 separate the gap between the first transparent substrate 10 and the second transparent substrate 20 into a plurality of accommodating cavities 101, each accommodating cavity 101 corresponds to a sub-pixel, and each accommodating cavity 101 is provided with charged ink particles 40.

[0064] A first side electrode 31 and a second side electrode 32 are respectively disposed on the retaining walls 30 on opposite sides of each accommodating cavity 101 . The first side electrode 31 and the second side electrode 32 are used to control the movement state of the charged ink particles 40 in the accommodating cavity 101 .

[0065] A colored reflective material layer is disposed on the second transparent substrate 20 , and the colored reflective material layer is used to reflect light of a corresponding color toward the first transparent substrate 10 .

[0066] In the present application, a colored reflective material layer is arranged on the second transparent substrate 20, so that the colored light can be reflected toward the side of the first transparent substrate 10, and then the movement state of the charged ink particles 40 in the accommodating cavity 101 is controlled by the first side electrode 31 and the second side electrode 32, so as to control the reflected colored light to be emitted from the first transparent substrate 10, so that the color electronic paper display device realizes color display by reflecting ambient light.

[0067] In this embodiment, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, that is, the plurality of sub-pixels are composed of three types of sub-pixels. A column of first sub-pixels, a column of second sub-pixels, and a column of third sub-pixels are periodically arranged in sequence in the row direction, that is, an RGB arrangement; of course, the first sub-pixel, the second sub-pixel, and the third sub-pixel may also be arranged in other ways.

[0068] The colored reflective material layer includes a first color reflective material layer 22 corresponding to the first sub-pixel, a second color reflective material layer 23 corresponding to the second sub-pixel, and a third color reflective material layer 24 corresponding to the third sub-pixel. The first color reflective material layer 22 can reflect light of the first color, the second color reflective material layer 23 can reflect light of the second color, and the third color reflective material layer 24 can reflect light of the third color. Since each sub-pixel reflects monochromatic light, there is no afterimage problem, so that the screen switching is smoother.

[0069] The first color, the second color and the third color are respectively one of the three colors of red, green and blue, and the first color, the second color and the third color are different. In this embodiment, the first color is blue (B), the second color is red (R), and the third color is green (G), that is, the first color reflective material layer 22 is a blue reflective material layer and reflects blue light, the second color reflective material layer 23 is a red reflective material layer and reflects red light, and the third color reflective material layer 24 is a green reflective material layer and reflects green light. Of course, in its embodiment, the first color can also be green (G), the second color is red (R), and the third color is blue (B), that is, the first color reflective material layer 22 is a green reflective material layer and reflects green light, the second color reflective material layer 23 is a red reflective material layer and reflects red light, and the third color reflective material layer 24 is a blue reflective material layer and reflects blue light; or, the first color is red (R), the second color is blue (B), and the third color is green (G), that is, the first color reflective material layer 22 is a red reflective material layer and reflects red light, the second color reflective material layer 23 is a blue reflective material layer and reflects blue light, and the third color reflective material layer 24 is a green reflective material layer and reflects green light; or, the first color is blue (B), the second color is green (G), and the third color is red (R), that is, the first color reflective material layer 22 is a blue reflective material layer and reflects blue light. The first color reflective material layer 22 is a green reflective material layer and reflects blue light, the second color reflective material layer 23 is a green reflective material layer and reflects green light, and the third color reflective material layer 24 is a red reflective material layer and reflects red light; or, the first color may also be green (G), the second color is blue (B), and the third color is red (R), that is, the first color reflective material layer 22 is a green reflective material layer and reflects green light, the second color reflective material layer 23 is a blue reflective material layer and reflects blue light, and the third color reflective material layer 24 is a red reflective material layer and reflects red light; or, the first color is red (R), the second color is green (G), and the third color is blue (B), that is, the first color reflective material layer 22 is a red reflective material layer and reflects red light, the second color reflective material layer 23 is a green reflective material layer and reflects green light, and the third color reflective material layer 24 is a blue reflective material layer and reflects blue light. Among them, as long as the first color, the second color and the third color are respectively one of the three colors of red, green and blue, and any arrangement and combination of the first color, the second color and the third color are different, they are included in the present application.

[0070] In this embodiment, the charged ink particles 40 in all the accommodating cavities 101 include black ink particles 41 and white ink particles 44. The black ink particles 41 and the white ink particles 44 carry opposite charges, and the white ink particles 44 can reflect white light. As a result, the color electronic paper display device can not only display color images, but also switch between color display images and black and white display images. Of course, when the black and white display mode is not required, the charged ink particles 40 can also be composed of only black ink particles 41. Among them, the black ink particles 41 are negatively charged, and the white ink particles 44 are positively charged; of course, the black ink particles 41 can also be positively charged, and the white ink particles 44 are negatively charged, but the electrical signals applied to the first side electrode 31 and the second side electrode 32 need to be adjusted accordingly.

[0071] Furthermore, the first color reflective material layer 22, the second color reflective material layer 23 and the third color reflective material layer 24 are all provided with focusing grooves on the side facing the first transparent substrate 10, and the focusing grooves are used to converge the reflected light, reduce the scattering of the reflected light to the edge, and make the reflected light emitted from the middle more concentrated, thereby improving the utilization rate of the light and improving the contrast and color saturation.

[0072] Furthermore, the second transparent substrate 20 is provided with a light-absorbing side wall 25 that separates the first color reflective material layer 22, the second color reflective material layer 23 and the third color reflective material layer 24 from each other, thereby avoiding the problem of color mixing between the reflected light of adjacent color reflective material layers to improve color saturation.

[0073] The second transparent substrate 20 is also provided with a reflective structure 27 corresponding to the light-absorbing side wall 25. The cross section of the reflective structure 27 is an inverted triangle structure, and is used to reflect the reflected light reflected by the colored reflective material layer to the colored reflective material layer for repeated use. Among them, part of the reflected light from the colored reflective material layer will be emitted to the edge area, and the reflective structure 27 will reflect the reflected light from this part of the edge area to the colored reflective material layer, and then the colored reflective material layer will reflect the first transparent substrate 10, so that the reflected light emitted from the middle is more concentrated, which can improve the utilization rate of light, and improve the contrast and color saturation. Optionally, the top angle of the reflective structure 27 is in contact with the light-absorbing side wall 25, that is, there is no gap between the top angle of the reflective structure 27 and the light-absorbing side wall 25, thereby avoiding the problem of color mixing between the reflective structures 27.

[0074] Furthermore, a light-absorbing bottom plate 26 is disposed on the second transparent substrate 20. The light-absorbing bottom plate 26 is located between the color reflective material layer and the second transparent substrate 20. The light-absorbing bottom plate 26 is used to absorb part of the light that passes through the color reflective material layer. The light-absorbing bottom plate 26 can be an integrated structure with the light-absorbing side wall 25. The light-absorbing bottom plate 26 and the light-absorbing side wall 25 together form a plurality of receiving grooves for receiving the color reflective material layer. The light-absorbing bottom plate 26 and the light-absorbing side wall 25 can be made of BM (black matrix) material.

[0075] The gaps between the color reflective material layer, the light absorbing side wall 25 and the reflective structure 27 may be filled with a flat layer material.

[0076] In this embodiment, a black matrix 11 corresponding to the retaining wall 30 is provided on the first transparent substrate 10, and the width of the lines of the black matrix 11 is greater than the sum of the widths of the retaining wall 30, the first side electrode 31 and the second side electrode 32. Therefore, when the white ink particles 44 move to the surfaces of the first side electrode 31 and the second side electrode 32, the black matrix 11 can block the reflection at the edge of the sub-pixel to prevent the problem of color mixing, thereby improving the color saturation.

[0077] Furthermore, a plurality of mutually independent signal electrodes 21 are provided on the second transparent substrate 20, and the first side electrode 31 and the second side electrode 32 are respectively conductively connected to the corresponding signal electrode 21, and the signal electrode 21 is used to apply corresponding electrical signals to the first side electrode 31 and the second side electrode 32, and each signal electrode 21 can independently apply an electrical signal to the corresponding first side electrode 31 or the second side electrode 32. The signal electrode 21 is provided on the side of the colored reflective material layer facing the accommodating cavity 101, so as to facilitate the conductive connection between the first side electrode 31 and the second side electrode 32 and the corresponding signal electrode 21.

[0078] The first transparent substrate 10 and the second transparent substrate 20 can be made of transparent substrates such as glass, acrylic and polycarbonate. The first side electrode 31 and the second side electrode 32 can be made of metal, such as copper, aluminum, molybdenum and other metals with good conductivity. The signal electrode 21 can be made of transparent conductive materials, such as indium tin oxide (ITO) or indium zinc oxide (IZO), so as to avoid affecting the light reflected by the color reflective material layer.

[0079] Fig.10 Schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model in the black state. Fig.10As shown, when the color electronic paper display device is in the black state, all the first side electrodes 31 and the second side electrodes 32 are applied with negative polarity electric signals, and the positively charged white ink particles 44 are adsorbed on the surfaces of the first side electrodes 31 and the second side electrodes 32, while the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the entire color electronic paper display device appears black. Of course, in other embodiments, no electric signal may be applied to the first side electrode 31 and the second side electrode 32, and the black ink particles 41 and the white ink particles 44 are dispersed in the accommodating cavity 10, but the white ink particles 44 will have a small amount of reflected light, but the effect of the black state is poor.

[0080] Fig.11 Schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a red picture. Fig.11 As shown, when the color electronic paper display device displays a red image, electric signals of opposite polarities are applied to the first side electrode 31 and the second side electrode 32 corresponding to the second sub-pixel, for example, the first side electrode 31 is applied with a positive electric signal, and the second side electrode 32 is applied with a negative electric signal. The positively charged white ink particles 44 are all adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are all adsorbed on the surface of the first side electrode 31, so that the accommodating cavity 101 corresponding to the second sub-pixel is in a transparent state, and the ambient light passes through the accommodating cavity 101 and is reflected by the second color reflective material layer 23, thereby reflecting the second color (red) light, so that the second sub-pixel appears red. Negative electric signals are applied to the first side electrode 31 and the second side electrode 32 corresponding to the first sub-pixel and the third sub-pixel, and the positively charged white ink particles 44 are adsorbed on the surface of the first side electrode 31 and the second side electrode 32, and the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the first sub-pixel and the third sub-pixel appear black. Therefore, when the first sub-pixel and the third sub-pixel appear black, and the second sub-pixel appears red, the entire color electronic paper display device appears red.

[0081] Fig.12 Schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a green picture. Fig.12As shown, when the color electronic paper display device displays a green image, electric signals of opposite polarities are applied to the first side electrode 31 and the second side electrode 32 corresponding to the third sub-pixel, for example, the first side electrode 31 is applied with a positive electric signal, and the second side electrode 32 is applied with a negative electric signal. The positively charged white ink particles 44 are all adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are all adsorbed on the surface of the first side electrode 31, so that the receiving cavity 101 corresponding to the third sub-pixel is in a transparent state, and the ambient light passes through the receiving cavity 101 and is reflected by the third color reflective material layer 24, thereby reflecting the third color (green) light, so that the third sub-pixel appears green. Negative electric signals are applied to the first side electrode 31 and the second side electrode 32 corresponding to the first sub-pixel and the second sub-pixel, and the positively charged white ink particles 44 are adsorbed on the surface of the first side electrode 31 and the second side electrode 32, and the negatively charged black ink particles 41 are dispersed in the receiving cavity 10 to absorb the ambient light, so that the first sub-pixel and the second sub-pixel appear black. Therefore, when the first sub-pixel and the second sub-pixel appear black, and the third sub-pixel appears green, the entire color electronic paper display device appears green.

[0082] Fig.13 Schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a blue picture. Fig.13 As shown, when the color electronic paper display device displays a blue image, electric signals of opposite polarities are applied to the first side electrode 31 and the second side electrode 32 corresponding to the first sub-pixel, for example, the first side electrode 31 is applied with a positive electric signal, and the second side electrode 32 is applied with a negative electric signal. The positively charged white ink particles 44 are all adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are all adsorbed on the surface of the first side electrode 31, so that the accommodating cavity 101 corresponding to the first sub-pixel is in a transparent state, and the ambient light passes through the accommodating cavity 101 and is reflected by the first color reflective material layer 22, thereby reflecting the light of the first color (blue), so that the first sub-pixel appears green. Negative electric signals are applied to the first side electrode 31 and the second side electrode 32 corresponding to the third sub-pixel and the second sub-pixel, and the positively charged white ink particles 44 are adsorbed on the surface of the first side electrode 31 and the second side electrode 32, and the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the third sub-pixel and the second sub-pixel appear black. Therefore, when the third sub-pixel and the second sub-pixel appear black, and the first sub-pixel appears blue, the entire color electronic paper display device appears blue.

[0083] Fig.14 Schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a color pattern. Fig.14 As shown, when the color electronic paper display device displays a color pattern, in the corresponding sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel) displaying black, the corresponding first side electrode 31 and the second side electrode 32 are both applied with negative polarity electric signals, the positively charged white ink particles 4 are both adsorbed on the surface of the first side electrode 31 and the second side electrode 32, and the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the corresponding sub-pixel appears black. In the corresponding second sub-pixel displaying red, the corresponding first side electrode 31 and the second side electrode 32 are applied with electric signals of opposite polarities, for example, the first side electrode 31 is applied with positive polarity electric signals, and the second side electrode 32 is applied with negative polarity electric signals. The positively charged white ink particles 44 are all adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are all adsorbed on the surface of the first side electrode 31, so that the corresponding second sub-pixel's receiving cavity 101 is in a transparent state, and the ambient light passes through the receiving cavity 101 and is reflected by the second color reflective material layer 23, thereby reflecting the second color (red) light, so that the corresponding second sub-pixel appears red. In the corresponding third sub-pixel that displays green, the corresponding first side electrode 31 and the second side electrode 32 are applied with electrical signals of opposite polarities, for example, the first side electrode 31 is applied with an electrical signal of positive polarity, and the second side electrode 32 is applied with an electrical signal of negative polarity. The positively charged white ink particles 44 are all adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are all adsorbed on the surface of the first side electrode 31, so that the corresponding third sub-pixel's receiving cavity 101 is in a transparent state, and the ambient light passes through the receiving cavity 101 and is reflected by the third color reflective material layer 24, thereby reflecting the third color (green) light, so that the corresponding third sub-pixel appears green. In the first sub-pixel corresponding to the blue display, the corresponding first side electrode 31 and the second side electrode 32 are applied with electric signals of opposite polarities, for example, the first side electrode 31 is applied with electric signals of positive polarity, and the second side electrode 32 is applied with electric signals of negative polarity. The positively charged white ink particles 44 are all adsorbed on the surface of the second side electrode 32, and the negatively charged black ink particles 41 are all adsorbed on the surface of the first side electrode 31, so that the corresponding first sub-pixel's accommodating cavity 101 is transparent, and the ambient light passes through the accommodating cavity 101 and is reflected by the first color reflective material layer 23, thereby reflecting the first color (blue) light, so that the corresponding first sub-pixel appears blue. Under the mutual mixing of red light, green light, and blue light, the color electronic paper display device displays a color pattern. Of course, there are also black areas in the color pattern, and the sub-pixels in the black area appear black.

[0084] Among them, when displaying a color pattern, there is also a white area in the color pattern. In the sub-pixels corresponding to the white area (the first sub-pixel, the second sub-pixel, and the third sub-pixel), positive polarity electrical signals are applied to the corresponding first side electrodes 31 and the second side electrodes 32. The negatively charged black ink particles 41 are adsorbed on the surfaces of the first side electrodes 31 and the second side electrodes 32, and the positively charged white ink particles 44 are dispersed in the accommodating cavity 10 to reflect white light, so that the corresponding sub-pixels appear white, and thus need to be synthesized through red light, green light, and blue light, with higher brightness to improve contrast.

[0085] Fig.15 Schematic diagram of the structure of the color electronic paper display device in the third embodiment of the present utility model when displaying a black and white pattern. Fig.15 As shown, when the color electronic paper display device displays a black and white pattern, in the corresponding sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel) that display black, the corresponding first side electrode 31 and the second side electrode 32 are both applied with negative polarity electrical signals, and the positively charged white ink particles 44 are both adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, while the negatively charged black ink particles 41 are dispersed in the accommodating cavity 10 to absorb the ambient light, so that the corresponding sub-pixels appear black. In the corresponding sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel) that display white, the corresponding first side electrode 31 and the second side electrode 32 are both applied with positive polarity electrical signals, and the negatively charged black ink particles 41 are adsorbed on the surfaces of the first side electrode 31 and the second side electrode 32, while the positively charged white ink particles 44 are dispersed in the accommodating cavity 10 to reflect white light, so that the corresponding sub-pixels appear white. Therefore, the color electronic paper display device can realize the display of black and white patterns.

[0086] [Example 4]

[0087] Fig.16 Schematic diagram of the structure of the color electronic paper display device in the fourth embodiment of the present utility model in the initial state. Fig.16 As shown, the color electronic paper display device provided by the fourth embodiment of the present invention is different from the color electronic paper display device provided by the third embodiment ( Figures 9 to 15 ) are substantially the same, except that, in this embodiment:

[0088] The second transparent substrate 20 is also provided with a reflective bottom plate 28 disposed on the entire surface, and the reflective bottom plate 28 is located between the colored reflective material layer and the second transparent substrate 20. That is, the reflective bottom plate 28 in this embodiment replaces the light-absorbing bottom plate 26 in the third embodiment. The reflective bottom plate 28 is used to reflect part of the light that passes through the colored reflective material layer, thereby improving the utilization rate of the light and improving the contrast and color saturation.

[0089] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the third embodiment, and will not be described in detail here.

[0090] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0091] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A color electronic paper display device, characterized in that: The invention comprises a first transparent substrate (10), a second transparent substrate (20) arranged opposite to the first transparent substrate (10), and a plurality of retaining walls (30) arranged between the first transparent substrate (10) and the second transparent substrate (20), wherein the retaining walls (30) divide the gap between the first transparent substrate (10) and the second transparent substrate (20) into a plurality of accommodating cavities (101), each of the accommodating cavities (101) corresponds to a sub-pixel, and each of the accommodating cavities (101) is provided with charged ink particles (40); A first side electrode (31) and a second side electrode (32) are respectively provided on the retaining walls (30) on opposite sides of each accommodating cavity (101), wherein the first side electrode (31) and the second side electrode (32) are used to control the movement state of the charged ink particles (40) in the accommodating cavity (101); A colored reflective material layer is provided on the second transparent substrate (20), and the colored reflective material layer is used to reflect light of a corresponding color toward the first transparent substrate (10).

2. The color electronic paper display device according to claim 1, characterized in that: The colored reflective material layer comprises a first color reflective material layer (22) disposed on the entire surface, and the first color reflective material layer (22) is capable of reflecting light of a first color; The plurality of sub-pixels include a first sub-pixel and a second sub-pixel. The first sub-pixel corresponds to the charged ink particles (40) in the accommodating cavity (101), including black ink particles (41) and second color reflective particles (42). The black ink particles (41) and the second color reflective particles (42) carry opposite charges, and the second color reflective particles (42) can reflect light of a second color. The second sub-pixel corresponds to the charged ink particles (40) in the accommodating cavity (101), including black ink particles (41) and third color reflective particles (43). The black ink particles (41) and the third color reflective particles (43) carry opposite charges, and the third color reflective particles (43) can reflect light of a third color.

3. The color electronic paper display device according to claim 1, characterized in that: The plurality of sub-pixels include a first sub-pixel, a second sub-pixel and a third sub-pixel; the colored reflective material layer includes a first color reflective material layer (22) corresponding to the first sub-pixel, a second color reflective material layer (23) corresponding to the second sub-pixel and a third color reflective material layer (24) corresponding to the third sub-pixel; the first color reflective material layer (22) can reflect light of a first color, the second color reflective material layer (23) can reflect light of a second color, and the third color reflective material layer (24) can reflect light of a third color.

4. The color electronic paper display device according to claim 3, characterized in that: The charged ink particles (40) in all the accommodating cavities (101) include black ink particles (41) and white ink particles (44); the black ink particles (41) and the white ink particles (44) have opposite charges; and the white ink particles (44) are capable of reflecting white light.

5. The color electronic paper display device according to claim 3, characterized in that: The first color reflective material layer (22), the second color reflective material layer (23) and the third color reflective material layer (24) are all provided with light focusing grooves on the side facing the first transparent substrate (10), and the light focusing grooves are used to focus reflected light.

6. The color electronic paper display device according to claim 3, characterized in that: The second transparent substrate (20) is also provided with a light-absorbing side wall (25) which separates the first color light-reflecting material layer (22), the second color light-reflecting material layer (23) and the third color light-reflecting material layer (24) from each other.

7. The color electronic paper display device according to claim 6, characterized in that: The second transparent substrate (20) is also provided with a reflective structure (27) corresponding to the light-absorbing side wall (25); the cross-section of the reflective structure (27) is an inverted triangle structure, and is used to reflect reflected light reflected by the colored reflective material layer to the colored reflective material layer for reuse.

8. The color electronic paper display device according to claim 3, characterized in that: The second transparent substrate (20) is also provided with a light-absorbing bottom plate (26) arranged on the entire surface, and the light-absorbing bottom plate (26) is located between the colored light-reflecting material layer and the second transparent substrate (20); Alternatively, a reflective bottom plate (28) is provided on the second transparent substrate (20) and is arranged entirely on the second transparent substrate; the reflective bottom plate (28) is located between the colored reflective material layer and the second transparent substrate (20).

9. The color electronic paper display device according to any one of claims 2 to 8, characterized in that: The first color, the second color and the third color are respectively one of red, green and blue, and the first color, the second color and the third color are different.

10. The color electronic paper display device according to claim 1, characterized in that: A black matrix (11) corresponding to the retaining wall (30) is provided on the first transparent substrate (10), and the width of the lines of the black matrix (11) is greater than the sum of the widths of the retaining wall (30), the first side electrode (31) and the second side electrode (32); And / or, a plurality of mutually independent signal electrodes (21) are provided on the second transparent substrate (20), the first side electrode (31) and the second side electrode (32) are respectively conductively connected to the corresponding signal electrodes (21), and the signal electrodes (21) are used to apply corresponding electrical signals to the first side electrode (31) and the second side electrode (32).

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