TWI780747B - Double-sided e-paper display panel and operating method of display apparatus - Google Patents

Abstract

The present invention provides a double-sided e-paper display panel including a first substrate, a second substrate, a display medium layer, a first light isolation pattern layer, a second light isolation pattern layer, a first electrode layer, and a second electrode layer. The second substrate and the first substrate are disposed opposite to each other. The display medium layer is disposed between the first substrate and the second substrate. The first light isolation pattern layer is disposed on a surface of the first substrate opposite to the display medium layer, and the first light isolation pattern layer and the second light isolation pattern layer at least partially does not overlap in a top view direction. The first electrode layer is disposed between the first substrate and the display medium layer, and the second electrode layer is disposed between the display medium layer and the second substrate.

Description

Double-sided electronic paper display panel and operation method of display device

The invention relates to an electronic paper display panel and a method for operating a display device, in particular to an electronic paper display panel capable of double-sided display and an operating method for a display device.

Many types of display devices have been developed, such as liquid crystal display devices, organic light emitting diode display devices, or electronic paper (E-paper) display devices. Since the electronic paper display device uses ambient light as the light source, it does not need an active light source, and it can still display continuously when the electronic paper display device is turned off. Therefore, it has become the most power-saving technology in the current display device, and the displayed image is most similar to paper. However, the existing electronic paper display devices are for single-sided display and cannot display double-sided display, so that their application fields are limited.

According to another embodiment of the present invention (disclosure), a double-sided electronic paper display panel is provided, which includes a first substrate, a second substrate, a display medium layer, a first optical isolation pattern layer, a second optical isolation pattern layer, and a second optical isolation pattern layer. An electrode layer and a second electrode layer. The second substrate is opposite to the first substrate. The display medium layer is disposed between the first substrate and the second substrate. The first optical isolation pattern layer is arranged on the surface of the first substrate opposite to the display medium layer, the second optical isolation pattern layer is arranged on the surface of the second substrate opposite to the display medium layer, and the first optical isolation pattern layer and the second The light-isolating pattern layer is at least partially non-overlapping in a plan view direction. The first electrode layer is arranged between the first substrate and the display medium layer, and the second electrode layer is arranged between the display medium layer and the second substrate.

According to still another embodiment of the present invention (disclosure), a method for operating a display device is provided, which The middle display device includes a double-sided electronic paper display unit, a control unit, a drive unit, and an input unit. The control unit is electrically connected to the double-sided electronic paper display unit through the drive unit, and the input unit is electrically connected to the control unit. The double-sided electronic paper display unit includes a first substrate, a second substrate, a display medium layer, a first light isolation pattern layer, a second light isolation pattern layer, a first electrode layer and a second electrode layer. The second substrate is opposite to the first substrate. The display medium layer is disposed between the first substrate and the second substrate. The first optical isolation pattern layer is arranged on the surface of the first substrate opposite to the display medium layer, the second optical isolation pattern layer is arranged on the surface of the second substrate opposite to the display medium layer, and the first optical isolation pattern layer and the second The light-isolating pattern layer is at least partially non-overlapping in a plan view direction. The first electrode layer is arranged between the first substrate and the display medium layer, and the second electrode layer is arranged between the display medium layer and the second substrate. Firstly, display data is received through the input unit. Then, the display mode of the double-sided electronic paper display unit is judged through the control unit according to the display data. When the control unit determines that the display mode is the single-sided display mode, the double-sided electronic paper display unit is driven through the driving unit according to the display data to display images on the display surface of the double-sided electronic paper display unit. When the control unit determines that the display mode is the double-sided display mode, the double-sided electronic paper display unit is driven through the driving unit according to the display data to display images on the display surface and the other display surface of the double-sided electronic paper display unit.

1,2,3,4,5,6,7,8: double-sided electronic paper display panel

102: The first substrate

104: Second substrate

106: Optical isolation layer

108,408: the first display medium layer

110,410: the second display medium layer

112,312,412,512,712: first electrode layer

112a, 412a, 512a1, 712a: first electrode

114,314,414,514,714: second electrode layer

114a, 414a, 512a2, 714a: second electrode

116: The third electrode layer

116a, 312a: the first common electrode

118: The third substrate

120: Microcapsules

120A: plastic case

120B, 620B: fluid

120C: positively charged particles

120D: negatively charged particles

1S1, 1S2: display surface

222: The fourth electrode layer

222a: second common electrode

224: The fourth substrate

226,228: Color filter layer

226B: blue filter

226G: Green filter

226R: red filter

408A, 708A, 808A: the first display unit

410A, 708B, 808B: second display unit

430: The first retaining wall

432: Second retaining wall

508,608,708: display medium layer

512a: electrode

514a: common electrode

516: the first optical isolation pattern layer

516A: first opening

516B: The first optical isolation block

518: the second optical isolation pattern layer

518A: second opening

518B: The second optical isolation block

608a: display unit

620C: charged particles

630,830: retaining wall

9: Double-sided electronic paper display device

902:Double-sided electronic paper display unit

904: drive unit

9041:First drive

9042: Second drive

906: control unit

908: input unit

910: memory unit

D1: the first direction

D2: Second direction

HD: horizontal direction

L, L1, L2: light

S12, S14, S16, S18, S20, S22, S24: steps

VD: looking down direction

FIG. 1 is a schematic cross-sectional view of a double-sided electronic paper display panel according to a first embodiment of the present invention (disclosure).

FIG. 2 is a schematic cross-sectional view of a double-sided electronic paper display panel according to a second embodiment of the present invention (disclosure).

FIG. 3 is a schematic cross-sectional view of a double-sided electronic paper display panel according to a third embodiment of the present invention (disclosure).

Figure 4 shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a fourth embodiment of the present invention (disclosure) picture.

FIG. 5 is a schematic cross-sectional view of a double-sided electronic paper display panel according to a fifth embodiment of the present invention (disclosure).

FIG. 6 shows a plurality of exemplary top-view patterns of the first light-isolating pattern layer and the second light-isolating pattern layer of the present invention (disclosure).

FIG. 7 is a schematic cross-sectional view of a double-sided electronic paper display panel according to a sixth embodiment of the present invention (disclosure).

FIG. 8 is a schematic cross-sectional view of a double-sided electronic paper display panel according to a seventh embodiment of the present invention (disclosure).

FIG. 9 is a schematic cross-sectional view of a double-sided electronic paper display panel according to an eighth embodiment of the present invention (disclosure).

FIG. 10 is a schematic block diagram of a double-sided electronic paper display device according to an embodiment of the present invention (disclosure).

FIG. 11 is a schematic flow chart of the operation method of the double-sided electronic paper display device according to an embodiment of the present invention (disclosure).

The content of the present disclosure is described in detail below in conjunction with specific embodiments and accompanying drawings, and in order to make the content of the present invention (disclosure) clearer and easier to understand, each of the following drawings may be a simplified schematic diagram, and the elements therein may not be according to Drawn to scale. Moreover, the number and size of each element in the drawings are only for illustration, and are not intended to limit the scope of the present disclosure.

Please refer to FIG. 1 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a first embodiment of the present invention (disclosure). As shown in Figure 1, the double-sided electronic paper display panel 1 provided in this embodiment has two display surfaces 1S1 and 1S2 facing each other, and the double-sided electronic paper display panel 1 can display images from the display surfaces 1S1 and 1S2 respectively. . Specifically, the double-sided electronic paper display panel 1 includes a first substrate 102, a second substrate 104, an optical isolation layer 106, a first display medium layer 108, a second display medium layer 110, a first electrode layer 112, The second electrode layer 114 and the third electrode layer 116 . The first substrate 102 and the second substrate 104 are disposed opposite to each other, and the first substrate 102 and the second substrate 104 may respectively include flexible or inflexible transparent substrates, for example. Materials of the first substrate 102 and the second substrate 104 may include, for example, glass, ceramic, quartz, sapphire, acrylic, polyimide (PI) , polyethylene terephthalate (polyethylene terephthalate, PET), other suitable materials or combinations thereof, but not limited thereto. In this embodiment, the surface of the first substrate 102 opposite to the second substrate 104 can be used as the display surface 1S1 for displaying an image, and the surface of the second substrate 104 opposite to the first substrate 102 can be used as the display surface 1S2. Used to display another image, but not limited thereto.

The light isolation layer 106 is disposed between the first substrate 102 and the second substrate 104 for isolating or absorbing light entering from the display surfaces 1S1 and 1S2 and passing through the first display medium layer 108 and the second display medium layer 110 . In this embodiment, the double-sided electronic paper display panel 1 may further include a third substrate 118 disposed between the first substrate 102 and the second substrate 104, and the optical isolation layer 106 is disposed on the third substrate 118 facing the second substrate. on the surface of the substrate 104, but not limited thereto. The material of the third substrate 118 may be similar or identical to that of the first substrate 102 or the second substrate 104 , but is not limited thereto. In some embodiments, the optical isolation layer 106 can also be disposed on the surface of the third substrate 118 facing the first substrate 102 . The light isolation layer 106 can be, for example, a black material or a white material. The black material can include, for example, a black photoresist material or a black film material, and the white material can include, for example, a white photoresist material or a white film material, but not limited thereto. The color of the optical isolation layer 106 can determine the background color of the image. For example, when the optical isolation layer 106 is a black material, the background of the image can be a black background, and the pattern of the image can be white. On the contrary, when the optical isolation layer 106 is white When using materials, the background of the image can be a white background, and the pattern of the image can be black, but not limited thereto. The color of the light isolation layer 106 can be determined according to design requirements. The optical isolation layer 106 can be formed on the third substrate 118 by coating or pasting, but is not limited thereto.

The first display medium layer 108 is disposed between the first substrate 102 and the optical isolation layer 106, the second display medium layer 110 is disposed between the optical isolation layer 106 and the second substrate 104, and the first display medium layer 108 and The second display medium layer 110 may include a fluid 120B and a plurality of charged particles. In this embodiment, the first display medium layer 108 and the second display medium layer 110 may respectively include a plurality of microcapsules 120, and each microcapsule 120 may include a shell 120A, a part of the fluid 120B and a plurality of charged particles, The shell 120A encloses the portion of the fluid 120B, and the charged particles are dispersed in the fluid 120B. The plastic shell 120A may include, for example, a polymer material or other suitable materials, the charged particles may, for example, include titanium dioxide or other suitable materials, and the fluid 120B may, for example, be a liquid, wherein the liquid may include, but is not limited to, ink. Therefore, the double-sided electronic paper display panel 1 of this embodiment can be microcapsule electrophoretic type, but not limited thereto. For example, the charged particles may include a plurality of positively charged particles 120C and a plurality of negatively charged particles 120D, and the positively charged particles 120C and the negatively charged particles 120D have different colors. In a monochrome display embodiment, one of the positively charged particles 120C and the negatively charged particles 120D may be white, and the other may be black, but not limited thereto. In this case, the fluid 120B may be transparent or black, but not limited thereto. The positively charged particles 120C and the negatively charged particles 120D of the present invention can also be in other suitable colors according to actual needs. In some embodiments, the charged particles can also be all positively charged particles with the same color or all negatively charged particles, and the color of the charged particles can be different from the color of the fluid 120B, for example, the charged particles can be white while the fluid 120B is black .

The first electrode layer 112 is arranged between the first substrate 102 and the first display medium layer 108, and the second electrode layer 114 is arranged between the second display medium layer 110 and the second substrate 104, and the third electrode layer 116 is arranged Between the first display medium layer 108 and the optical isolation layer 106 . In this embodiment, the third substrate 118 is disposed between the third electrode layer 116 and the optical isolation layer 106, so that the third electrode layer 116 can be formed on the surface of the third substrate 118 opposite to the optical isolation layer 106, but not limited to this. In some embodiments, the third electrode layer 116 may be located between the third substrate 118 and the optical isolation layer 106 or between the optical isolation layer 106 and the second display medium layer 110 . The materials of the first electrode layer 112, the second electrode layer 114 and the third electrode layer 116 may include transparent conductive materials to allow light to pass through. For example, the transparent conductive materials may include indium tin oxide, indium zinc oxide or other materials. suitable conductive material.

In this embodiment, the first electrode layer 112 may include a plurality of first electrodes 112a separated from each other, disposed on the surface of the first substrate 102 facing the second substrate 104, and the first electrodes 112a may be arranged in an array, for example. . The second electrode layer 114 may include a plurality of second electrodes 114 a separated from each other, disposed on the surface of the second substrate 104 facing the first substrate 102 , and the second electrodes 114 a may be arranged in an array, for example. Although not shown in FIG. 1 , the first substrate 102 and the second substrate 104 may include active array circuits or passive array circuits for electrically connecting and providing voltages to the first electrodes 112 a and the second electrodes 114 a. The third electrode layer 116 may include a first common electrode 116a, which overlaps the first electrode 112a and the second electrode 114a in the vertical direction VD perpendicular to the display surface 1S1 or the display surface 1S2, thereby being located between the first electrode 112a and the second electrode 116a. The charged particles between a common electrode 116a can be controlled by the voltage difference between the first electrode 112a and the first common electrode 116a, and the charged particles between the second electrode 114a and the first common electrode 116a can be controlled by the voltage difference between the second electrode 112a and the first common electrode 116a. The voltage difference between 114a and the first common electrode 116a is controlled. In this embodiment, the first electrode 112a may overlap with the plurality of microcapsules 120 of the first display medium layer 108 in the top view direction VD, but is not limited thereto. In some embodiments, one microcapsule 120 of the first display medium layer 108 may overlap with one or a plurality of first electrodes 112 a in the top view direction VD.

For example, as shown in FIG. 1, when the positively charged particles 120C are black and the negatively charged particles 120D are white, by applying a negative voltage to the first electrode 112a, the voltage lower than that of the first common electrode 116a (such as the ground voltage) , the positively charged particles 120C will be attracted by the first electrode 112a and move toward the first electrode 112a, and the negatively charged particles 120D will be attracted by the first common electrode 116a and move toward the first common electrode 116a, so they enter from the display surface 1S1 The light L can be reflected by the black positively charged particles 120C, so that the image displayed on the display surface 1S1 of the double-sided electronic paper display panel 1 presents a dark state or a color close to the dark state. Conversely, when the positive voltage applied to the first electrode 112a is higher than the voltage of the first common electrode 116a (such as the ground voltage), the image displayed by the double-sided electronic paper display panel 1 from the display surface 1S1 can be in a bright state or close to a bright state s color. Through the size of the voltage difference between the first electrode 112a and the first common electrode 116a or the time length, frequency or timing of applying the voltage difference, the number of black positively charged particles 120C adjacent to the first electrode 112a can be controlled. The quantity and the quantity of the white negatively charged particles 120D adjacent to the first common electrode 116a can present different display gray scales. Likewise, the image displayed by the double-sided electronic paper display panel 1 from the display surface 1S2 can be controlled through the voltage difference between the second electrode 114a and the first common electrode 116a. In this way, the display surfaces 1S1 and 1S2 can display independent images, thereby improving the application field of the double-sided electronic paper display panel 1 . Moreover, the double-sided electronic paper display panel 1 of this embodiment can reduce the cost of the substrate, optical isolation layer, electrode layer and other control elements compared to only two independent single-sided electronic paper display panels being bonded back to back. The arrangement can not only reduce the thickness in the top view direction VD, but also reduce the material and manufacturing costs.

The double-sided electronic paper display panel is not limited to the above embodiments, and may have different embodiments. To simplify the description, the different embodiments below will use the same symbols as those in the first embodiment to denote the same elements. In order to clearly illustrate different embodiments, differences between the first embodiment and different embodiments will be described below, and repeated descriptions will not be repeated.

Please refer to FIG. 2 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a second embodiment of the present invention (disclosure). As shown in Figure 2, the difference between the double-sided electronic paper display panel 2 provided in this embodiment and the double-sided electronic paper display panel 1 shown in Figure 1 is that the double-sided electronic paper display panel 2 of this embodiment is additionally It includes a fourth electrode layer 222 disposed between the light isolation layer 106 and the second display medium layer 110 . Specifically, the fourth electrode layer 222 may include the second common electrode 222a, and the image displayed from the display surface 1S2 can be controlled by the voltage difference between the second electrode 114a and the second common electrode 222a, and the image displayed from the display surface 1S1 The displayed image is still controlled by the voltage difference between the first electrode 112a and the first common electrode 116a. The material of the fourth electrode layer 222 may include a transparent conductive material to allow light to pass through. For example, the transparent conductive material may include indium tin oxide, indium zinc oxide or other suitable conductive materials. In some embodiments, the double-sided electronic paper display panel 2 may further include a fourth substrate 224 disposed between the fourth electrode layer 222 and the optical isolation layer 106, so that the fourth electrode layer 222 may be formed on the fourth substrate 224 On the surface facing the second substrate 104 , the optical isolation layer 106 may be disposed between the third substrate 118 and the fourth substrate 224 , but is not limited thereto. The material of the fourth substrate 224 may be similar or identical to the material of the first substrate 102 or the second substrate 104, but is not limited to this. In some embodiments, the fourth electrode layer 222 may also be formed on the surface of the fourth substrate 224 facing the third substrate 118 .

In some embodiments, the double-sided electronic paper display panel 2 may further include a color filter layer 226 disposed on the surface of the first substrate 102 opposite to the second substrate 104, so that the display surface 1S1 of the double-sided electronic paper display panel 2 Full color images can be displayed. The surface of the color filter layer 226 opposite to the first substrate 102 can be used as the display surface 1S1 , but not limited thereto. For example, the color filter layer 226 may include a red filter 226R, a green filter 226G, and a blue filter 226B. In some embodiments, a color filter layer 228 may also be disposed on the surface of the second substrate 104 opposite to the first substrate 102 . The surface of the color filter layer 228 opposite to the second substrate 104 can be used as the display surface 1S2 , but not limited thereto. In some embodiments, the color filter layers 226 and 228 can also be applied to the double-sided electronic paper display panel 1 shown in FIG. 1 or any of the following embodiments.

Please refer to FIG. 3 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a third embodiment of the present invention (disclosure). As shown in Figure 3, the difference between the double-sided electronic paper display panel 3 provided in this embodiment and the double-sided electronic paper display panel 2 shown in Figure 2 is that the first electrode layer 112 shown in Figure 2 The structure and the structure of the third electrode layer 116 may be interchanged with each other, and/or the structure of the second electrode layer 114 and the structure of the fourth electrode layer 222 . Specifically, the first electrode layer 312 includes a first common electrode 312a, the second electrode layer 314 includes a second common electrode 314a, the third electrode layer 316 includes a plurality of first electrodes 316a, and the fourth electrode layer 322 includes a plurality of a second electrode 322a. In this embodiment, the image displayed on the display surface 1S1 can be controlled by the voltage difference between the first electrode 316a and the first common electrode 312a, and the image displayed on the display surface 1S2 can be controlled by the voltage difference between the second electrode 322a and the second common electrode 312a. The voltage difference between the common electrodes 314a is controlled.

Please refer to FIG. 4 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a fourth embodiment of the present invention (disclosure). As shown in Figure 4, the difference between the double-sided electronic paper display panel 4 provided in this embodiment and the double-sided electronic paper display panel 1 shown in Figure 1 is that the first display medium layer 408 includes a plurality of first display unit 408A, and each first display unit 408A may include fluid 120B and charged particles. For clarity, FIG. 4 only shows that the double-sided electronic paper display panel 4 corresponds to a single first display unit 408A area, but not limited thereto. The first display unit 408A may respectively correspond to one pixel or sub-pixel of the image displayed by the double-sided electronic paper display panel 4 from the display surface 1S1 , for example. The first electrode layer 412 includes a plurality of electrode pairs separated from each other, respectively corresponding to a first display unit 408A, and each electrode pair may include two first electrodes 412a separated from each other, respectively adjacent to two corresponding first display units 408A. Side setting. Moreover, the first electrode layer 412 may include an opaque conductive material, such as metal or other suitable materials.

Specifically, the double-sided electronic paper display panel 4 may further include a plurality of first barrier walls 430 disposed between the first substrate 102 and the optical isolation layer 106, thereby separating the first display unit 408A and A cavity is formed between the first substrate 102 and the light isolation layer 106 for setting the fluid 120B and the charged particles of the first display unit 408A. Moreover, the first electrodes 412 a corresponding to the same first display unit 408A can be disposed on the first substrate 102 in the cavity and adjacent to the first barrier wall 430 . It should be noted that the charged particles in this embodiment may include positively charged particles 120C and negatively charged particles 120D with different colors, and the distribution of the positively charged particles 120C and negatively charged particles 120D in the horizontal direction HD can pass through between the first electrodes 412a The voltage difference and the time to provide the voltage difference are adjusted. The horizontal direction HD is, for example, the arrangement direction of the first electrodes 412a, but is not limited thereto. For example, when the negatively charged particles 120D can be white and the positively charged particles 120C are black, a voltage difference can be provided on the first electrode 412a, for example, the first electrode 412a on the left in FIG. The first electrode 412a applies a negative voltage to generate an electric field in the horizontal direction, so that the white negatively charged particles 120D can be arranged between the first electrodes 412a, and the black positively charged particles 120C are located between one of the first electrodes 412a and the optical isolation layer. 106 and are shielded by the first electrode 412a, so that a white image can be displayed on the display surface 1S1. By applying different voltages to the first electrode 412a, the relationship between the distribution position and quantity of the white negatively charged particles 120D and the black positively charged particles 120C in the horizontal direction can be changed, so that the display surface 1S1 can display desired gray scales. The color of the charged particles of the present invention is not limited to the above, and can also have other colors, or different first display units 408A can have different colors that can be mixed into white, for example, there can be charged particles of red and black, and charged particles of green and black. The particles or blue and black charged particles enable the display surface 1S1 to display color images.

In some embodiments, the second display medium layer 410 may also include a plurality of second display units 410A, and each second display unit 410A may include the fluid 120B and charged particles. The second electrode layer 414 includes a plurality of electrode pairs separated from each other, respectively corresponding to a second display unit 410A, and each electrode pair may include two second electrodes 414a separated from each other, respectively adjacent to two of the corresponding second display unit 410A. Side setting. Moreover, the second electrode layer 414 may include an opaque conductive material, such as metal or other suitable materials, so as to shield the charged particles between the second electrode 414 a and the light isolation layer 106 . The second display unit 410A may, for example, respectively correspond to a pixel or a sub-pixel of the image displayed by the double-sided electronic paper display panel 4 from the display surface 1S2 . Moreover, the double-sided electronic paper display panel 4 may further include a plurality of second barrier walls 432 disposed between the second substrate 104 and the optical isolation layer 106, thereby separating the second display unit 410A, and in the second A chamber is formed between the second substrate 104 and the optical isolation layer 106 for setting the fluid 120B and the charged particles of the second display unit 410A. Moreover, the second electrode 414 a corresponding to the same second display unit 410A can be disposed on the second substrate 104 in the chamber and adjacent to the second barrier wall 432 . In this embodiment, the charged particles in the second display unit 410A may also include positively charged particles 120C and negatively charged particles 120D with different colors, and the distribution of the positively charged particles 120C and negatively charged particles 120D in the horizontal direction can be transmitted through the second display unit 410A. The voltage difference between the electrodes 414a and the time for providing the voltage difference are adjusted, so that the display surface 1S2 can display the desired gray scale. Since the second display unit 410A displays images or drives in a manner similar or identical to that of the first display unit 408A, details are not repeated here. In some embodiments, a third substrate (such as the third substrate 118 shown in FIG. 3 ) may be disposed between the optical isolation layer 106 and the first display unit 408A, and/or A fourth substrate (such as the fourth substrate 224 shown in FIG. 3 ) may be disposed between 410A, but is not limited thereto.

Please refer to Figure 5 and Figure 6, Figure 5 shows a cross-sectional schematic diagram of a double-sided electronic paper display panel according to a fifth embodiment of the present invention (disclosure), and Figure 6 illustrates the first embodiment of the present invention (disclosure) Several schematic diagrams of top-view patterns of the light-isolation pattern layer and the second light-isolation pattern layer. As shown in FIG. 5, the double-sided electronic paper display panel 5 provided in this embodiment may only include a single display medium layer 508, which is arranged on the first substrate 102 Between the second substrate 104 , the thickness of the double-sided electronic paper display panel 5 can be reduced. Specifically, the double-sided electronic paper display panel 5 may further include a first light isolation pattern layer 516 , a second light isolation pattern layer 518 , a first electrode layer 512 and a second electrode layer 514 . The first electrode layer 512 is disposed between the first substrate 102 and the display medium layer 508 , and the second electrode layer 514 is disposed between the display medium layer 508 and the second substrate 104 . One of the first electrode layer 512 and the second electrode layer 514 includes a plurality of electrodes separated from each other, while the other layer includes a common electrode, so that the display medium layer 508 can be controlled by providing a voltage difference between the electrodes and the common electrode. , and the desired image is displayed. For example, the first electrode layer 512 may include a plurality of electrodes 512a, and the second electrode layer 514 may include a common electrode 514a, but not limited thereto, and vice versa. Materials of the first electrode layer 512 and the second electrode layer 514 may include transparent conductive materials, such as indium tin oxide, indium zinc oxide or other suitable conductive materials. The display medium layer 508 may, for example, be similar or identical to the first display medium layer or the second display medium layer of the first embodiment, but is not limited thereto. The materials of the first light-isolation pattern layer 516 and the second light-isolation pattern layer 518 can be, for example, black material, white material or other colors of materials, and the black material can, for example, include black photoresist material or black film material, while the white material can be, for example, Including white photoresist material or white film material, but not limited thereto. For example, the material of the first light isolation pattern layer 516 and the second light isolation pattern layer 518 may be the same as that of the light isolation layer 106 of the first embodiment above, but not limited thereto.

The first optical isolation pattern layer 516 is disposed on the surface of the first substrate 102 opposite to the display medium layer 508, the second optical isolation pattern layer 518 is disposed on the surface of the second substrate 104 opposite to the display medium layer 508, and the first optical The isolation pattern layer 516 and the second optical isolation pattern layer 518 do not overlap at least partially in the top view direction VD, so that the first optical isolation pattern layer 516 can shield a part of the display medium layer 508 from the display surface 1S1, while the second optical isolation pattern layer 518 can shield another part of the display medium layer from the display surface 1S2. Specifically, the first light-isolation pattern layer 516 may include at least one first opening 516A, and overlap the second light-isolation pattern layer 518 in the top view direction VD, and the second light-isolation pattern layer 518 may include at least one second opening 518A. , overlapping with the first light isolation pattern layer 516 in the plan view direction VD. In this embodiment, the first light The isolation pattern layer 516 can include a plurality of first openings 516A and a plurality of first optical isolation blocks 516B, and the second optical isolation pattern layer 518 can include a plurality of second openings 518A and a plurality of second optical isolation blocks 518B, each The first optical isolation block 516B overlaps a corresponding second opening 518A in the top view direction VD, and each second light isolation block 518B overlaps a corresponding first opening 516A in the top view direction VD. The electrodes 512a may include a plurality of first electrodes 512a1 and a plurality of second electrodes 512a2. In the top view direction VD, the first opening 516A and the corresponding second optical isolation block 518B can overlap with at least one first electrode 512a1 (such as the one shown in FIG. 5 ), and overlap with at least one microcapsule 120 (such as the one shown in FIG. 5) overlap, and likewise, the second opening 518A and the corresponding first optical isolation block 516B may overlap with at least one second electrode 512a2 (such as the one shown in FIG. At least one microcapsule 120 (eg, two as shown in FIG. 5 ) overlaps. In this way, the light L1 that strikes the double-sided electronic paper display panel 5 from below the double-sided electronic paper display panel 5 only enters through the first opening 516A, and the first optical isolation block 516B can shield the light from the double-sided electronic paper display panel 5. The light entering the area corresponding to the second electrode 512a2 from below, and the voltage difference between the first electrode 512a1 corresponding to the first opening 516A and the corresponding part of the common electrode 514a can control the microcapsules 120 located therebetween, so that the double-sided electronic paper The image displayed by the display panel 5 from the display surface 1S1 can be displayed through the first opening 516A. The light L2 emitted from above the double-sided electronic paper display panel 5 to the double-sided electronic paper display panel 5 will only enter through the second opening 518A, and the second optical isolation block 518B can block the light entering from above the double-sided electronic paper display panel 5 The light corresponding to the area of the first electrode 512a1, and the voltage difference between the second electrode 512a2 and the corresponding part of the common electrode 514a can control the microcapsules 120 located therebetween, so that the double-sided electronic paper display panel 5 can display from the display surface 1S2 Images can be displayed through the second opening 518A. Therefore, by disposing the first light isolation pattern layer 506 on the outer surface of the first substrate 102 and the second light isolation pattern layer 518 on the outer surface of the second substrate 104, the double-sided electronic paper display panels 5 can be made to face each other. The display surfaces 1S1 and 1S2 display independent images. Since the double-sided electronic paper display panel 5 of this embodiment only uses a single-layer display medium layer 508, compared with the third and fourth embodiments, the settings of two substrates and two electrode layers can be reduced, so that the double-sided The electronic paper display panel 5 reduces the Thickness, and further reduce material and production costs. In the present invention, the number of first electrodes 512a1 and the number of microcapsules 120 corresponding to the same first opening 516A and the number of second electrodes 512a2 and the number of microcapsules 120 corresponding to the same second opening 518A can be adjusted according to actual needs.

It should be noted that, when light of the same gray scale is displayed from the first opening 516A and the second opening 518A, the voltage difference provided between the first electrode 512a1 and the common electrode 514a may be the same as that provided to the second electrode 512a2 and the common electrode 512a. The voltage difference of the electrode 514a may be a voltage difference capable of generating complementary gray scales. Taking the 256-bit grayscale (for example, 0 to 255) as an example, when light with a grayscale of 0 (for example, completely black) is displayed from the first opening 516A, the grayscale of this area viewed from the display surface 1S2 should be 255 (for example, all white), so if the second opening 518A is intended to display light with a grayscale of 0 (for example, all black), the grayscale of this area viewed from the display surface 1S1 should be 255 (for example, all white). It can be seen that the voltage difference provided between the first electrode 512a1 and the common electrode 514a when the first opening 516A shows a gray scale of 0 can be compared with that provided to the second electrode when the second opening 518A shows a gray scale of 255. The voltage difference between 512a2 and common electrode 514a is the same. By analogy, the driving control corresponding to the first opening 516A and the driving control corresponding to the second opening 518A can be complementary in color and brightness.

As shown in FIG. 6, viewed along the top view direction VD, the top view pattern of the first light isolation pattern layer 516 and the top view pattern of the second light isolation pattern layer 518 can be, for example, checkerboard, stripe or block, but not limited to this. Specifically, in examples (i) and (ii) and examples (v) and (vi) shown in FIG. And the second opening 518A and the second light isolation block 518B of the second light isolation pattern layer 518 can be, for example, strip-shaped respectively. In examples (i) and (ii), the first opening 516A, the first optical isolation block 516B, the second opening 518A, and the second optical isolation block 518B may respectively extend along the first direction D1, wherein the first opening 516A and the first optical isolation blocks 516B may be alternately arranged in sequence along the second direction D2, and the second openings 518A and the second optical isolation blocks 518B may be alternately arranged in sequence along the second direction D2, but not limited thereto. . In examples (v) and (vi), the first opening 516A, the first optical isolation block 516B, the second opening 518A, and the second optical isolation block 518B may respectively extend along the second direction D2, wherein the first opening 516A and the first optical isolation block 516B can be alternately arranged in sequence along the first direction D1 row, and the second openings 518A and the second optical isolation blocks 518B may be alternately arranged in sequence along the first direction D1, but not limited thereto. In the examples (iii) and (iv) shown in FIG. 6, the first optical isolation block 516A and the second optical isolation block 518B can be arranged in a checkerboard shape, and in the top view direction VD, the first optical isolation area The block 516B and the second optical isolation block 518B are offset from each other. For example, the first optical isolation block 516B can be located in the even row of the odd column and the odd row of the even column of the matrix, and the second optical isolation block 518B can be located in the odd row of the odd column and the even column of the matrix in the even-numbered rows of , but not limited to. In the examples (vii) and (viii) shown in FIG. 6, the first optical isolation pattern layer 516 may only have a single first opening 516A and a single first optical isolation block 516B, and the first optical isolation region The block 516B is located on the left side of the first opening 516A, and the second optical isolation pattern layer 518 may only have a single second opening 518A and a single second optical isolation block 518B, and the second optical isolation block 518B is located at the second opening Right side of 518A. In some embodiments, the area of the first optical isolation block 516B and the area of the second optical isolation block 518B may be the same or different from each other, or the area of the first optical isolation block 516B and the area of the first opening 516A The ratio and the ratio of the area of the second optical isolation block 518B to the area of the second opening 518A may be the same or different from each other. The above top view patterns of the first light isolation pattern layer 516 and the second light isolation pattern layer 518 are just examples, but not limited thereto, and can be adjusted according to actual needs.

Please refer to FIG. 7 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a sixth embodiment of the present invention (disclosure). As shown in FIG. 7, the difference between the double-sided electronic paper display panel 6 provided in this embodiment and the double-sided electronic paper display panel 5 shown in FIG. It is not separated by the plastic shell, but separated by the retaining wall 630 . Specifically, the display medium layer 608 may include a plurality of display units 608a, and each display unit 608a may include a fluid 620B and a plurality of charged particles 620C. For example, a single first optical isolation block 516B (or a single second opening 518A) can overlap at least one display unit 608a in the top view direction VD, and a single second optical isolation block 518B (or a single first opening 516A ) may overlap with at least one display unit 608a in the top view direction VD. In this embodiment, the double-sided electronic paper display panel 6 further includes a plurality of retaining walls 630, which are arranged on the first Between the substrate 102 and the second substrate 104, the display unit is separated, and the barrier wall 630, the first substrate 102 and the second substrate 104 can form a chamber for setting the fluid 620B and the charged particles of the display unit 608a 620C. The retaining wall 630 may be similar or identical to the first retaining wall 430 or the second retaining wall 432 shown in FIG. 4 , for example, but is not limited thereto. In some embodiments, the charged particles 620C in the same display unit 608a may have the same charge type, for example, all positively charged particles or all negatively charged particles. In this case, the fluid 620B and the charged particles 620C may have different colors, such as black and white, respectively. Taking the positively charged particles 620C as an example, when the positive voltage supplied to the first electrode 512a1 is higher than the voltage of the common electrode 514a (for example, the ground voltage), the charged particles 620C will move close to the common electrode 514a, thus corresponding to the first electrode 512a1. The display surface 1S1 of the opening 516A displays a dark state or a color close to the dark state, and when the negative voltage supplied to the first electrode 512a1 is lower than the voltage of the common electrode 514a (for example, the ground voltage), the charged particles 620C will move close to the first electrode 512a1. The electrode 512a1, therefore, the display surface 1S1 corresponding to the first opening 516A displays a bright state or a color close to the bright state. Conversely, when the positive voltage supplied to the second electrode 512a2 is higher than the voltage of the common electrode 514a, the display surface 1S2 corresponding to the second opening 518A will display a color that is bright or close to the bright state, and when the positive voltage supplied to the second electrode When the negative voltage of 512a2 is lower than the voltage of the common electrode 514a, the display surface 1S2 corresponding to the second opening 518A will display a dark state or a color close to the dark state. It can be known from this that the double-sided electronic paper display panel 6 of this embodiment can be, for example, a microcup electrophoretic type.

In some embodiments, the fluid 620B can also have different colors that can be mixed into white, for example, the fluid 620B in different display units 608a corresponding to the first opening 516A or corresponding to the second opening 518A can have red, green and blue colors respectively, But not limited to this. In some embodiments, the charged particles 620C in the same display unit 608a may also include positively charged particles and negatively charged particles of different colors, and the fluid 620B may be, for example, a gas. In this case, the double-sided electronic paper display panel 6 may For example, it is a quick response-liquid power display (QR-LPD) electronic paper.

Please refer to FIG. 8 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to a seventh embodiment of the present invention (disclosure). As shown in Figure 8, the double-sided electronic paper display panel 7 and The difference between the double-sided electronic paper display panel 6 shown in FIG. 7 is that the first electrode layer 712 and the second electrode layer 714 of this embodiment can be similar or identical to the first electrode layer 412 and the first electrode layer 412 shown in FIG. 4 respectively. The second electrode layer 414 may include opaque conductive materials, such as metal or other suitable materials. Moreover, the display medium layer 708 may be similar or identical to the first display medium layer 408 or the second display medium layer 410 shown in FIG. 4 . Specifically, the display medium layer 708 may include at least one first display unit 708A and at least one second display unit 708B, and in this embodiment, may include a plurality of first display units 708A and a plurality of second display units 708B, But not limited to this. At least one first display unit 708A can be disposed corresponding to a first opening 516A, and at least one second display unit 708B can be disposed corresponding to a second opening 518A. The first electrode layer 712 includes a plurality of first electrode pairs separated from each other, respectively corresponding to a first display unit 708A, and each electrode pair may include two first electrodes 712a separated from each other, respectively adjacent to the corresponding first display unit 708A The two sides of the first display unit 708A are disposed on the first substrate 102 , for example, adjacent to or in contact with the retaining walls 630 on both sides of the first display unit 708A. The second electrode layer 714 includes a plurality of second electrode pairs separated from each other, respectively corresponding to a second display unit 708B, and each electrode pair may include two second electrodes 714a separated from each other, respectively adjacent to the corresponding second display unit 708B The two sides of the second display unit 708B are disposed on the second substrate 104 , for example, adjacent to or in contact with the retaining walls 630 on both sides of the second display unit 708B. Moreover, the charged particles in the first display unit 708A and the second display unit 708B may include positively charged particles 120C and negatively charged particles 120D with different colors. Through the voltage difference between the first electrodes 712a or the time length, number of times or timing of providing the voltage difference, the distribution position and quantity of the positively charged particles 120C and negatively charged particles 120D in the first display unit 708A can be controlled, so that the display surface 1S1 The corresponding color and grayscale are displayed. Similarly, through the voltage difference between the second electrodes 714a and the time of supplying the voltage difference, the distribution position and quantity of the positively charged particles 120C and negatively charged particles 120D in the second display unit 708B can be controlled, so that the display surface 1S2 can display Corresponding color and gray scale. Since the control methods of the positively charged particles 120C and the negatively charged particles 120D in the first display unit 708A and the second display unit 708B may be similar or identical to the first display unit 408A in FIG. 4 , details are not repeated here.

Please refer to FIG. 9 , which shows a schematic cross-sectional view of a double-sided electronic paper display panel according to an eighth embodiment of the present invention (disclosure). As shown in FIG. 9, the difference between the double-sided electronic paper display panel 8 provided in this embodiment and the double-sided electronic paper display panel 7 shown in FIG. 8 lies in that the first display unit 808A corresponding to the first opening 516A The cross-sectional shape may be a trapezoid, and the cross-sectional shape of the second display unit 808B corresponding to the second opening 518A may be an inverted trapezoid. For example, the extension direction of the side wall 830 between two adjacent first display units 808A and second display unit 808B may not be parallel to the top view direction VD, but may have an angle greater than 0 degrees and less than 90 degrees to the top view direction VD. Therefore, the retaining wall 830 can form a groove with a wide opening and a narrow bottom with the second substrate 104 , and can also form a groove with a wide opening and a narrow bottom with the first substrate 102 . Thus, the surface area of the first display unit 808A adjacent to the display surface 1S1 can be greater than the surface area adjacent to the second optical isolation region 518B, and the surface area of the second display unit 808B adjacent to the display surface 1S2 can be larger than that adjacent to the first optical isolation region Surface area of block 516B. In other words, the area of the first optical isolation block 516B may be smaller than the area of the corresponding second opening 518A, and the area of the second optical isolation block 518B may be smaller than the area of the corresponding first opening 516A. Therefore, the brightness of the light entering and exiting from the first opening 516A and the second opening 518A can be increased, thereby improving the image contrast or color saturation of the double-sided electronic paper display panel 8 . In some embodiments, a reflective layer may be disposed on the surface of the blocking wall 830 facing the first display unit 808A and the second display unit 808B, or the surface of the first light isolation pattern layer 516 facing the first substrate 102 and the second A reflective layer may be disposed on the surface of the second light-isolation pattern layer 518 facing the second substrate 104, so as to reflect the light passing through the first display unit 808A and the second display unit 808B, so as to enhance the transmission from the first opening 516A and the second display unit 808B. The brightness of the light emitted from the second opening 518A.

The following will further describe a display device applying the double-sided electronic paper display panel of the above-mentioned embodiments and an operation method thereof. Please refer to FIG. 10 , which shows a schematic block diagram of a double-sided electronic paper display device according to an embodiment of the present invention (disclosure). As shown in FIG. 10 , the double-sided electronic paper display device 9 provided in this embodiment may include a double-sided electronic paper display unit 902 , a drive unit 904 , a control unit 906 , an input unit 908 and a memory unit 910 . The double-sided electronic paper display unit 902 can be, for example, the double-sided An electronic paper display panel or a double-sided electronic paper display panel combining at least two embodiments, but not limited thereto. The driving unit 904 is electrically connected between the control unit 906 and the double-sided electronic paper display unit 902, and can be used to drive the double-sided electronic paper display unit 902 and control the voltage of the electrodes. The memory unit 910 is electrically connected to the control unit 906 and can be used to store the executed program, or can store processed data, set data or other data to be stored or temporarily stored during the executed program. The input unit 908 is electrically connected to the control unit 906 and can be, for example, a unit for inputting display data for receiving display data for displaying images on a single display surface or simultaneously displaying images on two display surfaces. For example, the interface connecting the input unit 908 to the outside may include a wired input interface, such as a video graphics array (video graphics array, VGA), a high definition multimedia interface (HDMI), a digital video interface (digital visual interface, DVI), display interface (DisplayPort), universal serial bus (universal serial bus, USB) or other suitable wired transmission interface, or wireless input interface, such as wireless network (WiFi), Bluetooth, 5G communication, optical communication or other wireless transmission interfaces, but not limited thereto. The control unit 906 can execute the program in the memory unit 910 , obtain display information from the memory unit 910 through the input unit 908 , and drive the double-sided electronic paper display unit 902 through the driving unit 904 . The control unit 906 can determine whether the display data is displayed on one of the display surfaces of the double-sided electronic paper display unit 902 or simultaneously displayed on both display surfaces. When displayed on the two display surfaces, the images displayed on the two display surfaces may be the same or different from each other. In some embodiments, the driving unit 904 may include a first driver 9041 and a second driver 9042, wherein the first driver 9041 can be used to drive the structure displayed from one display surface in the double-sided electronic paper display unit 902, and the second driver 9042 It can be used to drive the structure of the double-sided electronic paper display unit 902 to display from another display surface, thereby simplifying the processing of the controller. Taking the double-sided electronic paper display panel 1 shown in Figure 1 as an example, the first driver 9041 can be used to provide voltage to the first electrode layer 112 to drive the first display medium layer 108, and the second driver 9042 can be used to provide voltage to the second electrode layer 114 to drive the second display medium layer 110 . Taking the double-sided electronic paper display panel 5 shown in FIG. 5 as an example, the first driver 9041 can be used to provide a voltage to the first electrode 512a1 corresponding to the first opening 516A, and the second driver 9042 can be used to provide a voltage. Press to the second electrode 512a2 corresponding to the second opening 518A.

Please refer to FIG. 11 , which shows a schematic flowchart of the operation method of the double-sided electronic paper display device according to an embodiment of the present invention (disclosure). As shown in FIG. 11 , the operation method of the double-sided electronic paper display device provided by this embodiment may include steps S12 to S24. The double-sided electronic paper display device 9 in FIG. 10 and the double-sided electronic paper display unit 902 will be further described below using the double-sided electronic paper display panel 5 in FIG. 5 as an example, but not limited thereto. The operation method of this embodiment is also applicable to the double-sided electronic paper display panels of other embodiments above. First, start from step S12 to input display data, so that the control unit 906 can receive the display data through the input unit 908 . Then, proceed to step S14, when the control unit 906 receives the display data, the control unit 906 can judge which display mode the double-sided electronic paper display panel 1 is according to the display data, wherein the display mode can be divided into the first single-side display mode , a second single-sided display mode and a double-sided display mode.

When the display data can include the first display data displayed from the display surface 1S1, the through control unit 906 can determine that the display mode is the first single-sided display mode, so step S16 can be performed, and the control unit 906 can pass through the first display data according to the first display data. The driving unit 904 (such as the first driver 9041 ) drives the double-sided electronic paper display unit 902 to display images on the display surface 1S1 of the double-sided electronic paper display unit 902 . For example, the first driver 9041 can provide a corresponding voltage to the first electrode 512a1 according to the first display data, so as to control the black positively charged particles 120C and white negatively charged particles 120D corresponding to the first electrode 512a1 . The second driver 9042 can provide a positive voltage to the second electrode 512a2 to attract the white negatively charged particles 120C, so that the black positively charged particles 120C approach the display surface 1S2, so the display surface 1S2 can be in a dark state without displaying images.

When the display data can include the second display data displayed from the display surface 1S2, the control unit 906 can determine that the display mode is the second single-sided display mode, so step S18 can be performed, and the control unit 906 can drive the display according to the second display data. The unit 904 (such as the second driver 9042 ) drives the double-sided electronic paper display unit 902 to display images on the display surface 1S2 of the double-sided electronic paper display unit 902 . In this mode, the first driver 9041 can provide a negative voltage to the first electrode 512a1 to attract black positively charged particles 120C, so the display surface 1S1 can be in a dark state without displaying images.

When the display data includes the first display data displayed from the display surface 1S1 and the second display data displayed from the display surface 1S2, the control unit 906 determines that the display mode is a double-sided display mode, so step S20 can be performed, and the control unit 906 can Drive the double-sided electronic paper display unit 902 through the driving unit 904 (for example, the first driver 9041 and the second driver 9042) according to the first display data and the second display data, so as to display the display surface 1S1 and the display surface 1S1 of the double-sided electronic paper display unit 902 respectively. The display surface 1S2 displays images. The first display data and the second display data may respectively include, for example, the position, color, and brightness of a pixel or a sub-pixel, but are not limited thereto.

In some embodiments, when the double-sided electronic paper display unit 902 is any one of the above-mentioned embodiments in Fig. 5 and Fig. 7, the voltage difference provided by the first driver 9041 and the second driver 9042 is a complementary gray scale to display the corresponding image. In some embodiments, the driving unit 904 does not include the first driver 9041 and the second driver 9042 , but stores a control program in the memory unit 910 to drive the structure displayed from the two display surfaces. In this case, when the double-sided electronic paper display unit 902 is any one of the above-mentioned embodiments in FIG. 5 and FIG. 7, the memory unit 910 can include a voltage complementary conversion program, so that the control unit 906 can The voltages provided to the first electrode 512a1 and the second electrode 512a2 are converted to display corresponding images.

After steps S16 , S18 , and S20 , proceed to step S22 , through the control unit 906 to determine whether there is updated display data, that is, to determine whether the input unit 908 receives another display data. When the control unit 906 determines that the input unit 908 has received another display data, that is, updated display data, step S12 and subsequent steps are repeated. When the control unit 906 determines that the input unit 908 has not received another display data, it proceeds to step S24 to stop driving the double-sided electronic paper display unit 902 , that is, to stop providing the driving voltage to the double-sided electronic paper display unit 902 through the driving unit 904 . Since the charged particles of the double-sided electronic paper display unit 902 do not change positions when the voltage is stopped, the double-sided electronic paper display unit 902 can still continuously display images corresponding to the original display data.

To sum up, in the double-sided electronic paper display panel of the present invention, since the display surfaces facing each other can display independent images, the application field of the double-sided electronic paper display panel can be improved. Moreover, since the double-sided electronic paper display panel only uses a single-layer optical isolation layer or a single-layer display medium layer, the thickness in the top view direction VD can be reduced, and material and manufacturing costs can be further reduced.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

5: Double-sided electronic paper display panel

1S1, 1S2: display surface

102: The first substrate

104: Second substrate

120: Microcapsules

120A: plastic case

120B: fluid

120C: positively charged particles

120D: negatively charged particles

508: Display medium layer

512: the first electrode layer

512a: electrode

512a1: first electrode

514: second electrode layer

512a2: second electrode

514a: common electrode

516: the first optical isolation pattern layer

516A: first opening

516B: The first optical isolation block

518: the second optical isolation pattern layer

518A: second opening

518B: The second optical isolation block

D1: the first direction

D2: Second direction

L, L1, L2: light

VD: looking down direction

Claims (15)

A double-sided electronic paper display panel, comprising: a first substrate; a second substrate, arranged opposite to the first substrate; a display medium layer, arranged between the first substrate and the second substrate, wherein the display The medium layer includes a plurality of fluids and a plurality of charged particles; a first optical isolation pattern layer is arranged on the surface of the first substrate opposite to the display medium layer; a second optical isolation pattern layer is arranged on the second substrate On the surface opposite to the display medium layer, and the first optical isolation pattern layer and the second optical isolation pattern layer do not overlap at least partially in a plan view direction; a first electrode layer is arranged on the first substrate and the between the display medium layers; and a second electrode layer disposed between the display medium layer and the second substrate. The double-sided electronic paper display panel as claimed in claim 1, wherein one of the first electrode layer and the second electrode layer includes a plurality of electrodes, and the other one of the first electrode layer and the second electrode layer A common electrode is included. The double-sided electronic paper display panel as claimed in item 1, wherein the display medium layer includes a plurality of microcapsules, each of which includes a fluid of the fluids and a plurality of charged particles of the charged particles, the The plurality of charged particles in the charged particles includes a plurality of positively charged particles and a plurality of negatively charged particles, and the positively charged particles and the negatively charged particles are dispersed in the fluid of the fluids and have different colors. The double-sided electronic paper display panel according to claim 1, wherein the display medium layer includes a plurality of display units, and each display unit includes a fluid of the fluids and a plurality of charged particles of the charged particles. The double-sided electronic paper display panel as claimed in claim 4, wherein the fluid in the fluids and the charged particles of the charged particles have different colors. The double-sided electronic paper display panel as claimed in claim 4 further includes a plurality of barriers disposed between the first substrate and the second substrate for separating the display units. The double-sided electronic paper display panel as claimed in claim 1, wherein the top view pattern of the first light isolation pattern layer and the top view pattern of the second light isolation pattern layer are checkerboard, stripe or block. The double-sided electronic paper display panel as claimed in item 1, wherein the first light-isolating pattern layer includes at least one first opening, overlaps with the second light-isolating pattern layer in the plan view direction, and the second light-isolating pattern layer The layer includes at least one second opening overlapping with the first light isolation pattern layer in the plan view direction. The double-sided electronic paper display panel as claimed in item 8, wherein the display medium layer includes at least one first display unit and at least one second display unit, respectively corresponding to the at least one first opening and the at least one second opening , the first electrode layer includes two first electrodes, respectively adjacent to the two sides of the at least one first display unit, and the second electrode layer includes two second electrodes, respectively adjacent to the two sides of the at least one second display unit edge, and the first electrode layer and the second electrode layer include opaque conductive material. The double-sided electronic paper display panel according to claim 9, wherein the cross-sectional shape of the at least one first display unit is trapezoidal, and the cross-sectional shape of the at least one second display unit is an inverted trapezoidal shape. The double-sided electronic paper display panel as claimed in item 8, wherein the first optical isolation pattern layer includes a plurality of first optical isolation blocks, the second optical isolation pattern layer includes a plurality of second openings, and each of the first optical isolation pattern layers A light isolation block overlaps with one of the second openings in the plan view direction. The double-sided electronic paper display panel as claimed in claim 11, wherein the second light-isolation pattern layer includes a plurality of second light-isolation blocks, the first light-isolation pattern layer includes a plurality of first openings, and each of the first light-isolation pattern layers The two optical isolation blocks overlap with one of the first openings in the plan view direction. The double-sided electronic paper display panel as claimed in claim 12, wherein the area of one of the first optical isolation regions is smaller than the area of one of the corresponding second openings, and the second optical isolation regions The area of one of the blocks is smaller than the area of the corresponding one of the first openings. A method for operating a display device, wherein the display device includes a double-sided electronic paper display panel as described in Claim 1, a control unit, a drive unit, and an input unit, and the control unit is electrically connected to the double-sided electronic paper through the drive unit An electronic paper display panel, and the input unit is electrically connected to the control unit, the operation method includes: receiving a display data through the input unit; judging a display mode of the double-sided electronic paper display panel through the control unit according to the display data; When the control unit determines that the display mode is a single-sided display mode, drive the double-sided electronic paper display panel through the drive unit according to the display data, so as to display images on a display surface of the double-sided electronic paper display panel; And when the control unit judges that the display mode is a double-sided display mode, drive the double-sided electronic paper display panel through the drive unit according to the display data, so as to display the double-sided electronic paper display panel on the display surface and the other side of the double-sided electronic paper display panel. The image is displayed on the display surface. The operating method of the display device as described in claim 14, further comprising judging through the control unit whether the input unit has received another display data, and when the control unit judges that the input unit has not received the other display data, Stop driving the double-sided electronic paper display panel.

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