TW201211956A - Reflection display device - Google Patents

Abstract

A reflection display device including a plurality of pixel units is provided. Each pixel unit includes a first substrate, a reflective layer on the first substrate; a color pigment layer on the reflective layer and having a first color pigment pattern and a second color pigment pattern; a first electrode layer on the color pigment layer; a second substrate having a first surface and a second surface, the first surface facing the first substrate; a second electrode layer on the first surface of the second substrate; a light absorption display medium between the first electrode layer and the second electrode layer; a solution layer between the first substrate and the second substrate; a third substrate opposite to the second surface of the second substrate; a third electrode layer on the second surface of the second substrate; a fourth electrode layer on the third substrate; and a reflective display medium between the third electrode layer and the fourth electrode layer, the reflective display medium reflecting a third color light.

Description

2〇12Π956ΐΝν 34944twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a reflective display device, and more particularly to a color reflective display device. [Prior Art] The development of colorized e-books has always been the focus of efforts from all walks of life, but currently colorized e-books often have problems of insufficient reflectivity. In the reflective & display panel, there are two technologies that are attracting attention, one is electrochromic = display technology, and the other is cholesterol liquid crystal display technology. However, both of the above display technologies have problems that must be overcome in colorization. In the electrochromic display panel, since the perfect material has not yet been released, = this must be done in the colored state and the degree of penetration in the decolored state: ': - straight is not reasonable (four) purification scheme, and Difficult to color the application of e-books. In a single solid-state liquid crystal display panel, since the liquid crystal can only reflect the first of 2 (for example, left-handed or right-handed light), the reflectivity of the liquid crystal display panel must be colored for multiple external solid-state liquid crystal display panels. The τα " blue sub-picture area will be presented. However, due to its reflectivity, it has the problem of poor color rendering and low contrast. SUMMARY OF THE INVENTION A plurality of embodiments provide a reflective display device having an early 70' per-pixel unit including a first substrate, a reflective layer, and a face 34944twf.doc/n 201211956

The roiyy'J〇29TW material layer, the first electrode layer, the second substrate, the second electrode layer, the light-absorbing display medium layer, the solution layer, the third substrate, the third electrode layer, the fourth electrode layer, and the reflective display medium. The reflective layer is on the first substrate. The pigment layer is on the reflective layer, and the pigment layer has a first color pattern and a second color pattern. The first electrode layer is on the pigment layer. The second substrate has opposing first and second surfaces, and the first surface faces the first substrate. The second electrode layer is on the first surface of the second substrate. The light absorbing display medium layer is between the first electrode layer and the second electrode layer. The solution layer is between the first substrate and the second substrate. The third substrate is located opposite to the second surface of the second substrate. The third electrode layer is located on the second surface of the second substrate. The fourth electrode layer is on the third substrate. The reflective display medium is positioned between the third electrode layer and the fourth electrode layer, wherein the reflective display medium reflects the third color of light. Another embodiment of the present invention provides a reflective display device having a plurality of pixel units, each pixel unit including a reflective substrate, a pigment layer, a first electrode layer, a second substrate, a second electrode layer, and a light absorption display. a dielectric layer, a solution layer, a third substrate, a third electrode layer, a fourth electrode layer, and a reflective display medium. The pigment layer is on the reflective substrate, and the pigment layer has a first color pattern and a first color pattern. The first electrode layer is located on the pigment. The second substrate has opposing first and second surfaces, and the first surface faces the first substrate. The second electrode layer is on the first surface of the second substrate. The light absorbing display medium layer is located between the first electrode layer and the second electrode layer. The solution layer is between the first substrate and the second substrate. The third substrate is located opposite the second surface of the second substrate. The third electrode layer is located on the second surface of the second substrate. The fourth electrode layer is on the third substrate. The reflective display medium is located between the second electrode layer and the fourth electrode layer of the 201211956 Γ ι ι fW 34944 twf. doc/n, wherein the reflective display medium reflects the third color light. In order to make the invention more apparent, the following detailed description of the embodiments and the accompanying drawings are set forth below. [Embodiment] FIG. 1 is a schematic cross-sectional view showing a reflective display device according to an embodiment of the present invention. In order to clearly illustrate the present embodiment, only one of the pixel units in the reflective display device is illustrated in FIG. In general, the display device is composed of a plurality of pixel units arranged in an array, and those skilled in the art can understand the structure of the reflective display device of the present embodiment from the description of the pixel unit of Fig. 1. Please refer to FIG. 1 'The reflective display device of the present embodiment includes a plurality of pixel units 100' and each of the pixel units may include a first substrate 102, a reflective layer 104, a pigment layer 106, a first electrode layer 110, and a second The substrate U8, the second electrode layer 116, the light-absorbing display medium layer U4, the solution layer U2, the third substrate 126, the third electrode layer 120, the fourth electrode layer 124, and the reflective display medium 122 are each according to the present embodiment. The prime unit 1 has a first unit area 100a and a second unit area 100b. The first substrate 102 is mainly used as a carrier member and a film layer. The first substrate 102 may be a rigid substrate or a flexible substrate. In addition, the first substrate 102 may be a transparent substrate or a reflective substrate (the reflective substrate may be used without a reflective layer), and the material may be glass, germanium, metal, high molecular polymer or other suitable materials. 201211956

29TW 34944twf.doc/n The reflective layer 104 is located on the first substrate 102. In the present embodiment, the reflective layer 104 may be overlaid on the surface of the first substrate 1〇2 in a comprehensive manner. The material of the reflective layer 104 may be a metal or a metal oxide having a reflective property (for example, titanium dioxide). The pigment layer 106 is on the reflective layer 1〇4, and the pigment layer 1〇6 has a first color pattern 106a and a second color pattern i〇6b. In the present embodiment, the first color pattern 106a and the second color pattern i〇6b are located in the first unit area 10a and the second unit area 1%, respectively. The pigment layer 1〇6 • can be, for example, a nano pigment' which can cause the light passing through the pigment layer 1〇6 to exhibit a corresponding color light. Further, the first color pattern 1〇6a and the second color pattern 106b may be selected from a combination of any two of a red pigment, a green pigment, and a blue pigment. For example, the first color pattern 1〇6a and the second color pattern 106b may be a combination of a red pigment_green pigment, a combination of a red pigment and a blue pigment, or a combination of a blue pigment_green pigment. In the present embodiment, a flat layer 108 may be further provided on the pigment layer 1〇6. The material of the flat layer 108 may be an organic insulating material or an insulative material, and the flat layer (10) is a transparent insulating material. The first electrode layer 110 is located on the pigment layer 106. In this embodiment, the first electrode layer 110 is a patterned electrode layer having an electrode pattern 11〇a 2 and an electrode pattern 11Gb′t: a pole is arranged along the 11Qa; and is disposed in the cell region 1〇〇& t and the electrode pattern 11Gb It is set in the single (four) domain. In addition, for example, the second drain layer 110 is a transparent electrode layer, and the material thereof may be a metal oxide such as bismuth indium tin oxide, indium zinc oxide, (tetra) oxide, squamous oxide, indium antimony zinc oxide or other suitable Material. 201211956 rw 34944twf.doc/n The second substrate 118 is disposed on the opposite side of the first substrate 1〇2. The second substrate 118 has opposing first and second surfaces U8a, 118b, and the first surface 118a faces the first substrate 1'2. Similarly, the second substrate 118 is primarily used as a carrier member and a film layer. The second substrate may be a rigid substrate or a flexible substrate. Further, the second substrate 118 is a transparent substrate ‘the material of which may be glass, high molecular polymer or other transparent material. The second electrode layer 116 is located on the first surface 118& of the second substrate 118. In the present embodiment, the second electrode layer 116 is a patterned electrode layer having an electrode pattern 116a and an electrode pattern U6b, the electrode patterns 116 & ^ are disposed in the cell region 1GGa' and the electrode pattern U6b is disposed in the single = region ι _Inside. In addition, the second electrode layer 116_the electrode layer may be made of a metal oxide, such as an oxide, an indium zinc oxide, an indium tin oxide, an IS zinc oxide, an indium antimony zinc oxide, and other suitable materials. . The light absorbing display medium layer 114 is located between the first electrode layer 11A and the layer U6. In other words, the first electrode layer 11 and the second electrode = 疋 are used to control the light-display medium layer 114. In the present embodiment, the absorbing medium layer 114 has the light absorbing display medium pattern ma and the light absorbing medium pattern U4b'. The light absorbing display medium pattern (10) is disposed inside the cell region' and the light absorbing display medium pattern 114b is disposed in the cell region. In addition, the light absorbing display medium layer 114 may comprise an electrowetting display medium or; I: the electric drive may display a transparent or colored display medium, preferably the absorbing tissue layer 1M may comprise an electrochromic material. 201211956 71 77w29TW 34944twf.doc/n Here, the above-mentioned light-absorbing display medium layer 114 may be a black material, a blue electro-chromic (four), a green electro-chromic material, a transparent electrochromic material. , black · transparent electrowetting display 2 blue · transparent electric · display medium, green. transparent electrowetting display medium or red · transparent electric display medium. In other words, the operation of transmitting the voltages of the 110th and second electrode layers 114 can cause the electric or electrowetting display medium to change between blue and transparent between black and transparent, or in green and The change of the solution layer m between the red and the transparent is between the first substrate 102 and the second substrate ι8. In the present embodiment, the light absorbing display medium 114 is an electrochromic material, and the solution layer 112 includes a solvent and a metal salt dissolved in a solvent. In the present embodiment, the light-absorbing display medium f 114 is an electrowetting display medium, and the solution layer ιι 2 may be a polar liquid such as water, a polar solvent, a metal salt dissolved in water or a polar hydrazine solvent. The third substrate 126 is located on the second surface of the second substrate 118. Similarly, the third substrate 126 is mainly used as a carrier element and the substrate 126 of the film may be a rigid substrate or a flexible substrate. Further, the third substrate 126 is a drenched plate, and the material f may be a lang, a polymer or other transparent material. The third electrode layer 120 is located on the second surface of the second substrate 118. According to the present embodiment, the third electrode layer 12G may be disposed between the unit region_a and the single region 100b, that is, the third electrode layer (10) may not need to be patterned between the unit region 100a and the unit region 100b. In addition, the 201211956 r 〇i yy\j\jjiy fW 34944twf.doc/n three-electrode layer 120 is a transparent electrode layer, which may be made of a metal oxide such as indium tin oxide, indium zinc oxide, aluminum tin oxide. Matter, aluminum zinc oxide, indium antimony zinc oxide or other suitable materials. The fourth electrode layer 124 is located on the third substrate 126. According to the present embodiment, the fourth electrode layer 124 is disposed in the cell region 嶋 and the cell region 〇〇b, that is, the fourth electrode layer 124 is not patterned between the cell region _ and the cell region 100b. In addition, the fourth electrode layer 124 electrode layer 'material may be a metal oxide, such as indium tin oxide, indium oxide, aluminum tin oxide, aluminum zinc oxide, indium antimony zinc oxide or other suitable Material. The reflective display medium 122 is located between the third electrode layer 12A and the fourth electrode layer 124. The third electrode layer 120 and the fourth electrode layer 124 are used to control the arrangement of the reflective display medium 122 such that it exhibits a reflected light state or a non-reflected light state. In addition, the reflective display medium 122 is a display medium capable of reflecting red light, a display medium capable of reflecting green light, or a display medium capable of reflecting blue light. In addition, in the embodiment, the reflective display medium 122 is located in the first unit area i〇〇a φ and the second unit area 10b. According to the embodiment, the reflective display medium 122 may include cholesterol. The liquid crystal material may be a cholesteric liquid crystal material that reflects red light, a cholesteric liquid crystal material that reflects green light, or a cholesteric liquid crystal material that reflects blue light. It is worth mentioning that the reflective display medium 122 needs to be matched with the first color pattern i〇6a and the second color pattern l〇6b of the pigment layer 106. In other words, the color light reflected by the reflective display medium 122 and the color of the first color pattern of the color pattern of the first color are the combination of the three colors of red, green and blue.

For example, if the first color pattern 106a and the second color pattern 106b of the pigment layer 106 are respectively a red pigment and a blue pigment, the reflective display medium 122 is a display medium that reflects green light. If the first color pattern 106a and the second color pattern 106b of the pigment layer 1〇6 are respectively a red pigment and a green pigment, the reflective display medium 122 is a display medium that reflects blue light. If the first color pattern 1〇6& and the second color pattern 106b of the pigment layer 106 are respectively a green pigment and a blue pigment, the reflective display medium 122 is a display medium that reflects red light. In addition, in the above description, the light-absorbing display medium layer 114 may be a black-transparent electrochromic material or an electrowetting display medium, a blue-transparent electrochromic material or an electrowetting display medium, green- A transparent electrochromic material or an electrowetting display medium, or a red-transparent electrochromic material or an electrowetting medium. If the electrochromic material 114 is black-transparent f-induced discoloration (four) or electro-depositive medium, the reflective display medium mWX of the county is an anti-pulse light medium, a display medium that can reflect green light, or a reflective blue color. Light display medium. = '县吸丝介介(四)妓色__Electrochromic^枓^赖Display medium, green·transparent electrochromic material or electrowetting ί not red-transparent electrochromic material or electrowetting display The display medium 122 and the light-absorbing display medium layer 114 are required to be used as the light-absorbing display medium layer (4) (for example, an electrochromic material or an electric 'inspector', I quality) m color needs to be reflected with the reflective display medium 122 201211956 ... 1&quot The color of the light called rw 34944twfdoc/n is the same. For example, if the light absorbing display medium layer (electrochromic material or electrowetting display medium) 114 is a blue-transparent material, the reflective display medium 122 is a display medium that reflects blue light. The reflective display medium 122 is a display medium that reflects green light if the light-absorbing display medium layer (electrochromic material or electrowetting display medium) Π4 is green_transparent material. If the light absorbing display medium layer (electrochromic material or electrowetting display medium) 114 is a red-transparent material, the reflective display medium 122 is a display medium that reflects red light. 2 to 6 are schematic views showing the operation of the reflective display device of Fig. 1. In order to clearly illustrate the operation of the reflective display device of the present invention, in the reflective display device of the following embodiments, the light-absorbing display medium layer 114 may be a black-transparent electrochromic material, and the first color pattern i颜料6a of the pigment layer 106. The second color pattern 106b is a red pigment and a blue pigment, respectively, and the reflective display medium 122 is a display medium that can reflect green light.

Referring to FIG. 2, when the pixel unit ι0 of the reflective display device is to be white, the first electrode layer 110 and the second electrode layer 116 are applied with a voltage to make the light-absorbing display medium layer (for example, electricity). The photochromic material 114 is in a transparent state. Further, a voltage is applied to the third electrode layer 120 and the fourth electrode layer 124 so that the arrangement of the reflective display medium 122 can reflect the green light. At this time, when the external light WL enters the halogen unit 100 of the reflective display device, a part of the light WL can penetrate the reflective display medium 122 and the transparent light-absorbing display medium layer 114, and then enter the red pigment 106a and the blue pigment. 106b is reflected by the reflective layer 104 to form a red ray RL and a blue ray bl. In addition, another portion of the light WL 201211956 η i yyuu29TW 34944twf.doc/n is reflected by the reflective display medium 122 to form green light GL. In other words, after the external light WL enters the halogen unit 100 of the reflective display panel, red light RL, blue light BL, and green light GL are reflected. Since the red ray RL, the blue ray BL, and the green ray GL can be mixed into white light, the pixel unit 1 显示 is displayed in white at this time. Referring to FIG. 3, when the pixel unit 1 of the reflective display device is to be black, a voltage is applied to the first electrode layer .110 and the second electrode layer 116 to make the light-absorbing display medium layer (for example, The electrochromic material 114 is in a black state. Further, a voltage ' is applied to the third electrode layer 120 and the fourth electrode layer 124 so that the arrangement of the reflective display medium 122 does not reflect light. At this time, when the external light WL enters the pixel unit 1 of the reflective display device, the light WL can penetrate the reflective display medium 122, and then the light WL is completely absorbed by the black after entering the black light-absorbing display medium layer 114. The display medium layer 114 is absorbed. In other words, after the ambient light WL enters the halogen unit 100 of the reflective display device, no light is reflected. Therefore, the pixel unit 100 is now displayed in black. Referring to FIG. 4, 'when the pixel unit 10 of the reflective display device is to be displayed in red, the electrode patterns 11a and 110b of the first electrode layer 11 and the electrode pattern U6a of the second electrode layer 116 are respectively formed, 116b is applied with a voltage such that the light-absorbing display medium layer (e.g., electrochromic material) 114a in the cell region 110a exhibits a transparent state 'to make the light-absorbing display medium layer (e.g., electrochromic material) 114b in the cell region n〇b In a black state, in addition, a voltage is applied to the third electrode layer 120 and the fourth electrode layer 124 such that the reflective display medium 122 is arranged to reflect light. At this time, when the external light 13 201211956^ 34944twf.doc/n WL enters the pixel unit of the reflective display device, the light WL can penetrate the reflective display medium 122. Thereafter, a portion of the light w1 penetrates the transparent light-absorbing display medium 114a, then enters the red pigment i〇6a and is reflected by the reflective layer 104 to form a red light RL; the other portion of the light WL enters the black light-absorbing display medium 114b and is completely It is absorbed by the black light-absorbing display medium 114b. In other words, after the external light WL enters the pixel unit 1 of the reflective display device, only the red light RL is reflected, so that the pixel unit 100 is displayed in red. Referring to FIG. 5, when the pixel unit 100 of the reflective display device is to be green, a voltage is applied to the first electrode layer 11 and the second electrode layer 116 to make the light-absorbing display medium layer (for example, electro-induced). The color changing material 114 is in a black state. Further, a voltage is applied to the third electrode layer 120 and the fourth electrode layer 124 so that the arrangement of the reflective display medium 122 can reflect the green light. At this time, when the external light WL enters the pixel unit 100 of the reflective display device, a part of the light WL can penetrate the reflective display medium 122 and enter the black light-absorbing display medium layer 114 to be black by the light-absorbing display medium layer 114. Absorbing; another portion of the light WL is reflected by the reflective display medium 122 to form green light GL. In other words, after the ambient light WL enters the pixel unit 100 of the reflective display device, only the green light line GL is reflected, so that the pixel unit 100 displays green at this time. Referring to FIG. 6, when the pixel unit 100 of the reflective display device is to be blue, the electrode patterns 110a, 11b and the electrode pattern 116a of the second electrode layer 116 are respectively applied to the first electrode layer 110. , 116b is applied with a voltage to cause the light-absorbing display medium layer in the cell region ll〇a (for example, electrochromic 14 34944twf.doc/n 201211956

roiyyuu29TW

The material 114a is in a black state, so that the light-absorbing display medium layer (e.g., electrochromic material) 114b in the cell region 11b is in a transparent state. Further, a voltage is applied to the third electrode layer 120 and the fourth electrode layer 124 so that the arrangement of the reflective display medium 122 can not reflect light. At this time, the light WL can penetrate the reflective display medium 122 when the external light WL enters the pixel unit 100 of the reflective display device. Thereafter, a portion of the light ^ is completely absorbed by the black light-absorbing display medium 114a after entering the black light-absorbing display medium 114a; the other portion of the light WL penetrates the transparent light-absorbing display medium 114b, and then enters the blue pigment i〇6a and is reflected by the reflective layer 104. 'to form a blue light BL. In other words, after the ambient light WL enters the pixel unit 100 of the reflective display device, only the blue light ray BL is reflected out. Thus, the pixel unit 1 显示 is blue. According to the operation of the above-mentioned FIG. 2 to FIG. 6, the pixel unit 1 of the reflective display device can be white, black, red, green, and blue, so that the full color can be achieved. The reflective display device of the present embodiment achieves full colorization by using two kinds of pigments and a light-absorbing display medium with a reflective display medium of monochromatic light. Such a reflective display device has better full-color performance and contrast than a conventional electrochromic display panel or a cholesteric liquid crystal display surface. VIII- In addition, in the above-mentioned operation descriptions of FIG. 2 to FIG. 6, the light-emitting display "quality 114 is a black-transparent electrochromic material, and the first pattern of the pigment layer 106a and the second color pattern lion are respectively red pigments. The embodiment of the present invention is not limited thereto. It should be understood that the first color pattern lG6a of the pigment layer i〇6 and the second color _ secret color and the color light reflected by the reflective display medium 122 may be combined to achieve the purpose of full colorization. The present invention has been disclosed in the above embodiments, but it is not intended to limit the invention, and any one of ordinary skill in the art, without departing from the spirit and scope of the invention, may make some modifications and The scope of protection is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a reflective display of a skirt according to an embodiment of the present invention. Fig. 1 is a schematic diagram of the operation of the reflective display device. [Main element symbol description] 100: Alizarin unit 100a, 100b: Unit area 102: First substrate 104: Reflective layer 106: Pigment layer 106a, 106b: Color pattern 108: Flat Layer 110: first electrode layer 110a, 110b: electrode pattern 201211956 roi^yuu29TW 34944twf.doc/n 112: solution layer 114: light absorbing display medium layer 114a, 114b: light absorbing display medium pattern 116: second electrode layer 116a, 116b: Electrode pattern 118: second substrate 118a, 118b: surface 120: third electrode layer 122: reflective display medium 124: fourth electrode layer 126 · third substrate WL: external light RL: red light BL: blue light GL : green light

17

Claims (1)

201211956 .........M 34944twf.doc/n VII. Patent application: k A reflective display device having a plurality of pixel units, each pixel unit comprising: a first substrate; a reflective layer located at On the first substrate; a pigment layer on the reflective layer, the pigment layer having a first color pattern and a second color pattern; a first electrode layer on the pigment layer; a second substrate; Having a first surface opposite to a first surface and a first surface facing the first substrate; a second electrode layer 'on the first surface of the second substrate; a light absorbing display medium layer located at Between the first electrode layer and the second electrode layer; a solution layer between the first substrate and the second substrate; a third substrate located opposite the second surface of the second substrate; a third electrode layer on the second surface of the second substrate; a fourth electrode layer on the third substrate; and a reflective display medium on the third electrode layer and the fourth electrode layer Between The reflective display medium reflects a third color of light. 2. The reflective display device of claim 1, wherein the first color pattern and the second color pattern of the pigment layer are respectively a red pigment and a blue pigment, and the reflective display medium reflects green Light. 3. The reflective display device of claim 1, wherein the first color pattern and the second color pattern of the pigment layer are red 201211956 roiyW9TW 34944twf.doc/n color pigment and green pigment, respectively. The reflection shows that the medium reflects blue light. 4. The reflective display device of claim 2, wherein the first color map multiplied by the pigment layer and the second color pattern are respectively a green pigment and a blue pigment, and the reflective display medium reflects Red light. 5. The reflective display device of claim 2, wherein the reflective display medium comprises a cholesteric liquid crystal material. 6. The reflective display device of claim 1, wherein the light-absorbing display medium layer comprises an electrochromic material, an electrowetting display medium or an electric drive to display a transparent or colored display. medium. 7. The reflective display device of claim 6, wherein the electrochromic material comprises a black-transparent electrochromic material, and the reflective display medium reflects red light, green light or blue light. 8. The reflective display device of claim 6, wherein the electrochromic material comprises a blue-transparent electrochromic material, and the reflective display medium reflects blue light. 9. The reflective display device of claim 6, wherein the electrochromic material comprises a green · transparent electrochromic material, and the reflective display medium reflects green light. 10. The reflective display device of claim 6, wherein the electrochromic material comprises a red · transparent electrochromic material, and the reflective display medium reflects red light. 11. The reflective display device of claim 6, wherein the electrowetting display material comprises a black-transparent electrowetting display material, and the reflective display medium reflects red light, green light, or blue light. The reflective display device of the invention of claim 6, wherein the electrowetting display material comprises a blue-transparent electro-wet display material and the reflective display medium reflects blue light. 13. The reflective display device of claim 6, wherein the electrowetting display material comprises a green-transparent electrowetting display material and the reflective display medium reflects green light. 14. As claimed in claim 6 The reflective display device of the item 'where the electrowetting display material comprises a red-transparent electrowetting display material' and the reflective display medium reflects red light. 15. The reflective display device of claim 1, wherein each pixel unit has a first unit area and a second unit area, and the first color pattern and the second color pattern are respectively located. The first unit area and the second unit area. 16. The reflective display device of claim 15 wherein the reflective display medium is located within the first unit area and the first % element area. 17. The reflective display device of claim 2, wherein the first and second electrode layers are each a patterned electrode layer. 18. The reflective display according to claim 1, wherein the first, second, third and fourth electrode layers are respectively ~^, the pole layer.反射明% 19. A reflective display device having a plurality of 昼-昼-element units comprising: % 奄 a reflective substrate; 20 201211956 x vi7^vv29TW 34944twf.doc/n a pigment layer on the reflective substrate The pigment layer has a first color pattern and a second color pattern; a first electrode layer on the pigment layer; a second substrate having a first surface and a second surface opposite to each other, and The first surface faces the first substrate; a second electrode layer is located on the first surface of the second substrate; a light absorbing display medium layer is located between the first electrode layer and the second electrode layer; a solution layer between the first substrate and the second substrate; a third substrate located opposite the second surface of the second substrate; a third electrode layer located at the second of the second substrate a fourth electrode layer on the third substrate; and a reflective display medium between the third electrode layer and the fourth electrode layer, wherein the reflective display medium reflects a third color light twenty one