An electronic paper display device

Abstract

The application discloses an electronic paper display device. The electronic paper display device comprises a driving substrate, a first electronic paper film and a second electronic paper film. The first electronic paper film is laid on one side surface of the driving substrate. The second electronic paper film is laid on the other side surface of the driving substrate away from the first electronic paper film. The driving substrate comprises a substrate, a data line, a first driving unit and a second driving unit. The first driving unit and the second driving unit are embedded in the substrate and are respectively exposed on the two opposite side surfaces of the substrate. The second driving unit is arranged at intervals from the first driving unit. The data line is arranged on one side of the substrate. The first driving unit and the second driving unit are connected with the data line. The first electronic paper film is connected with the first driving unit. The second electronic paper film is connected with the second driving unit. Thus, the first electronic paper film and the second electronic paper film can be independently displayed. The data line is arranged on one side of the substrate, thereby improving the display aperture ratio.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an electronic paper display device. BACKGROUND

[0002] In recent years, with the development of artificial intelligence and computer technology, society has entered the era of electronic information, and electronic paper as a new type of display technology that does not harm the eyes has been widely used. Modern electronic paper display has developed to be as easy to read and portable as printed matter.

[0003] The electronic paper screen displays patterns by reflecting ambient light, and has a paper printing-like effect. Compared with traditional transmissive liquid crystal displays, the electronic paper display screen does not need a backlight, is easy to read, and is still clearly visible even in sunlight. Since the electronic paper display screen does not need a backlight module, it can ensure eye health and is more eye-friendly to use, and can achieve a thickness and weight advantage over traditional displays.

[0004] Based on the various advantages of electronic paper, the application scenarios of electronic paper will become more and more extensive. However, most of the known electronic paper display devices are single-sided display, and some double-sided display electronic paper display devices have a small aperture ratio and a large thickness, which limits the application of electronic paper display devices in some application fields. SUMMARY

[0005] The main purpose of the present application is to provide an electronic paper display device, which aims to solve the above technical problems existing in the prior art.

[0006] To solve the above problems, the present application provides an electronic paper display device, which comprises a driving substrate, a first electronic paper film and a second electronic paper film. The first electronic paper film is laid on one side surface of the driving substrate; the second electronic paper film is laid on the other side surface of the driving substrate away from the first electronic paper film; wherein the driving substrate comprises a substrate, a data line, a first driving unit and a second driving unit. The first driving unit is embedded in the substrate and exposed on the two opposite side surfaces of the substrate respectively. The second driving unit is embedded in the substrate and exposed on the two opposite side surfaces of the substrate respectively. The second driving unit is arranged in a spaced manner with the first driving unit. The data line is arranged on one side surface of the substrate. The first driving unit and the second driving unit are connected with the data line respectively. The first electronic paper film is connected with the first driving unit. The second electronic paper film is connected with the second driving unit.

[0007] In some embodiments, the driving substrate further comprises a first insulating layer arranged on the side of the substrate away from the data line, and arranged in the same layer with the first driving unit and the second driving unit, and at least partially filled between the first driving unit and the second driving unit.

[0008] In some embodiments, the driving substrate further comprises a second insulating layer and a first driving layer group, the second insulating layer is arranged on the side of the first insulating layer away from the substrate, and the first driving layer group is arranged on the side of the second insulating layer away from the first insulating layer, and the first driving layer group is used to drive the first electronic paper film in cooperation with the first driving unit.

[0009] In some embodiments, the first driving layer group comprises a first common electrode, a third insulating layer and a first driving electrode, the first common electrode is arranged on the side of the second insulating layer away from the first insulating layer, the third insulating layer is arranged on the side of the second insulating layer away from the first insulating layer and covers the first common electrode, and the first driving electrode is arranged on the side of the third insulating layer away from the second insulating layer, and the first driving electrode is electrically connected with the first driving unit.

[0010] In some embodiments, the first insulating layer, the second insulating layer and the third insulating layer are all provided with first through holes in communication with each other, and the first driving electrode extends into the first through holes to be electrically connected with the first driving unit.

[0011] In some embodiments, the substrate has a first through hole penetrating through the two opposite surfaces of the substrate, the first driving unit comprises a first gate, a first active layer and a first source, the first source is arranged on the side of the substrate away from the data line and surrounds the first through hole, the first source is electrically connected with the first driving electrode, the first active layer comprises a first embedded part and a first surrounding part, the first surrounding part is arranged on the side of the first source away from the substrate, the first surrounding part is connected with the first embedded part and arranged around the first embedded part, the first embedded part is embedded in the first through hole and connected with the data line, and the first embedded part is formed with a first accommodating groove, and the first gate is at least partially inserted into the first accommodating groove, and the first gate is spaced from the first active layer by the first insulating layer.

[0012] In some embodiments, the driving substrate further comprises a second driving layer group, the second driving layer group comprises a second common electrode, a fourth insulating layer and a second driving electrode, the second common electrode is arranged on the side of the substrate facing the data line, the fourth insulating layer is arranged on the side of the substrate facing the data line and covers the data line and the second common electrode, and the second driving electrode is arranged on the side of the fourth insulating layer away from the substrate, and the second driving layer group is used to drive the second electronic paper film in cooperation with the second driving unit.

[0013] In some embodiments, the driving substrate further comprises a conductive part, the substrate is provided with a second through hole penetrating through the two sides of the substrate, the conductive part is arranged in the same layer as the data line and corresponds to the second through hole, the second driving unit extends into the second through hole to be electrically connected with the conductive part, and the conductive part is also electrically connected with the second driving electrode.

[0014] In some embodiments, the substrate substrate has a second through hole penetrating through the two opposite surfaces of the substrate substrate, the second driving unit includes a second gate, a second active layer and a second source electrode, the second source electrode is arranged on the side of the substrate substrate away from the data line and surrounds the second through hole, the second source electrode is electrically connected with the conductive part; the second active layer includes a second embedded part and a second surrounding part, the second surrounding part is arranged on the side of the second source electrode away from the substrate substrate, the second surrounding part is connected with the second embedded part and is arranged around the second embedded part, the second embedded part is embedded in the second through hole and connected with the data line, and the second embedded part is formed with a second accommodating groove; the second gate is at least partially inserted into the second accommodating groove, and the second gate is spaced from the second active layer by the first insulating layer.

[0015] In some embodiments, the fourth insulating layer is provided with a third via hole communicating the second driving electrode and the conductive part, and the second driving electrode extends into the third via hole to be electrically connected with the conductive part.

[0016] Compared with the prior art, the electronic paper display device of the present application comprises a driving substrate, a first electronic paper film and a second electronic paper film, the first electronic paper film is laid on one side surface of the driving substrate; the second electronic paper film is laid on the other side surface of the driving substrate away from the first electronic paper film; wherein the driving substrate comprises a substrate substrate, a data line, a first driving unit and a second driving unit, the first driving unit is embedded in the substrate substrate and is exposed on the two opposite side surfaces of the substrate substrate respectively, the second driving unit is embedded in the substrate substrate and is exposed on the two opposite side surfaces of the substrate substrate respectively, the second driving unit is arranged spaced from the first driving unit, the data line is arranged on one side surface of the substrate substrate, the first driving unit and the second driving unit are connected with the data line respectively, the first electronic paper film is connected with the first driving unit, and the second electronic paper film is connected with the second driving unit. Through the above-mentioned embodiments, the first driving unit and the second driving unit are embedded in the substrate substrate and are exposed on the two opposite side surfaces of the substrate substrate respectively, and are connected with the data line respectively, and the data line is arranged on one side surface of the substrate substrate, so that the first driving unit and the second driving unit can be controlled by the data line on one side surface of the substrate substrate to drive the first electronic paper film and the second electronic paper film. Therefore, the first electronic paper film and the second electronic paper film can be independently displayed under the driving of the first driving unit and the second driving unit respectively, at the same time, the first driving unit and the second driving unit can be controlled by the same data line, and the data line is located on one side of the substrate substrate, without the need to arrange the data line on both sides of the substrate substrate, thereby improving the display aperture ratio of the side of the driving substrate without the data line, further, the side of the driving substrate with the data line does not need to be provided with the driving unit, thereby improving the display aperture ratio of the side of the driving substrate with the data line, reducing the thickness of the electronic paper display device, and the production process is simpler. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0018] Figure 1 is a structural schematic diagram of an electronic paper display device according to one or more embodiments of the present application;

[0019] Figure 2 is an equivalent circuit diagram of an electronic paper display device according to Figure 1

[0020] Figure 3 is a wiring schematic diagram of a first common electrode of an electronic paper display device according to one or more embodiments of the present application.

[0021] Drawing reference: electronic paper display device 1; driving substrate 10; first via hole 101; second via hole 102; third via hole 103; substrate 11; first through hole 111; second through hole 112; data line 12; first driving unit 13; first gate 131; first active layer 132; first embedded part 1321; first surrounding part 1322; first accommodating groove 1323; first source 133; second driving unit 14; second gate 141; second active layer 142; second embedded part 1421; second surrounding part 1422; second accommodating groove 1423; second source 143; first insulating layer 15; second insulating layer 16; first driving layer group 17; first common electrode 171; third insulating layer 172; first driving electrode 173; second driving layer group 18; second common electrode 181; fourth insulating layer 182; second driving electrode 183; conductive part 19; first electronic paper film 20; second electronic paper film 30; first direction x1; second direction x2. DETAILED DESCRIPTION

[0022] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. ​

[0024] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0025] In this paper, the term "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0027] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] In recent years, with the development of artificial intelligence and computer technology, society has entered the era of electronic information, and electronic paper as a new display technology that does not hurt the eyes has been widely used. Modern electronic paper display has developed to be as easy to read and portable as printed matter.

[0031] The electronic paper screen displays patterns by reflecting ambient light, and has a paper printing-like effect. Compared with traditional transmissive liquid crystal displays, the electronic paper display does not need a backlight, is easy to read, and is still clear and visible even in sunlight. Since the electronic paper display does not need a backlight module, it can ensure eye health and is more eye-friendly to use, and can achieve a thickness and weight advantage over traditional displays.

[0032] Based on the various advantages of electronic paper, the application scenarios of electronic paper will become more and more extensive. However, most of the known electronic paper display devices are single-sided display, and some double-sided display electronic paper display devices have a small aperture ratio and a large thickness, which limits the application of electronic paper display devices in some application fields.

[0033] Please refer to Figures 1-2 , Figure 1 is a structural schematic diagram of an electronic paper display device according to one or more embodiments of the present application; Figure 2 is an equivalent circuit diagram of the electronic paper display device shown in Figure 1 .

[0034] To solve the above problems, the present application provides an electronic paper display device 1, which comprises a driving substrate 10, a first electronic paper film 20 and a second electronic paper film 30. The first electronic paper film 20 is laid on one side surface of the driving substrate 10. The second electronic paper film 30 is laid on the other side surface of the driving substrate 10 away from the first electronic paper film 20. The driving substrate 10 comprises a substrate substrate 11, a data line 12, a first driving unit 13 and a second driving unit 14. The first driving unit 13 is embedded in the substrate substrate 11 and respectively exposed on the two opposite side surfaces of the substrate substrate 11. The second driving unit 14 is embedded in the substrate substrate 11 and respectively exposed on the two opposite side surfaces of the substrate substrate 11. The second driving unit 14 is arranged in a spaced manner with the first driving unit 13. The data line 12 is arranged on one side surface of the substrate substrate 11. The first driving unit 13 and the second driving unit 14 are connected with the data line 12. The first electronic paper film 20 is connected with the first driving unit 13. The second electronic paper film 30 is connected with the second driving unit 14.

[0035] The first e-paper film 20 can include a plurality of microcapsules, each of which is composed of positively charged particles and negatively charged particles. Illustratively, in some application scenarios, when a negative electric field is applied to both ends of the microcapsule, the white particles with positive charges move to the negative pole of the electric field under the action of the electric field, and at the same time, the particles with negative charges move to the bottom of the microcapsule, at which time the surface displays white. When a positive electric field is applied to both ends of the microcapsule, the black particles move to the top of the microcapsule under the action of the electric field, at which time the surface appears black. Similarly, the second e-paper film 30 can also include a plurality of microcapsules, and it can be understood that the first e-paper film 20 and the second e-paper film 30 can display a picture through different driving states of the plurality of microcapsules.

[0036] The driving substrate 10 can be used to drive the first electronic paper film 20 and the second electronic paper film 30 to make the first electronic paper film 20 and the second electronic paper film 30 display a picture. Specifically, the driving substrate 10 can be used to drive a plurality of microcapsules on the first electronic paper film 20 and the second electronic paper film 30. The driving substrate 10 includes a substrate substrate 11, a data line 12, a first driving unit 13, and a second driving unit 14. The substrate substrate 11 can be a glass substrate or a flexible substrate, and the material of the flexible substrate is polyimide (PI). The first driving unit 13 and the second driving unit 14 can include a thin film transistor (TFT) device and a capacitor. The TFT (Thin Film Transistor) is a three-terminal electronic component that is the most basic and important in the semiconductor industry and has been widely used in consumer products such as flat panel displays and radio frequency tags. Each pixel relies on TFT for switching and driving. According to the different semiconductor materials of the TFT active layer, the TFT device can be a low-temperature polysilicon (LTPS) type or a metal oxide semiconductor (MOS) type, such as a metal oxide semiconductor type of indium gallium zinc oxide (IGZO). The first driving unit 13 can be used to drive the first electronic paper film 20 to make the first electronic paper film 20 display a picture, and the second driving unit 14 can be used to drive the second electronic paper film 30 to make the second electronic paper film 30 display a picture. The first driving unit 13 and the second driving unit 14 are embedded in the substrate substrate 11, and can be at least partially embedded in the substrate substrate 11. The second driving unit 14 and the first driving unit 13 are arranged in a spaced manner, thereby reducing the risk of short circuit between the first driving unit 13 and the second driving unit 14. The data line 12 can be used to transmit a data signal to the first driving unit 13 and the second driving unit 14. The data line 12 is arranged on one side surface of the substrate substrate 11. It should be noted that one of the first electronic paper film 20 and the second electronic paper film 30 can be located on the same side of the substrate substrate 11 as the data line 12. In some application scenarios, the first electronic paper film 20 can be located on the same side of the substrate substrate 11 as the data line 12, and the second electronic paper film 30 is located on the side of the substrate substrate 11 away from the data line 12. In other application scenarios, the second electronic paper film 30 can be located on the same side of the substrate substrate 11 as the data line 12, and the first electronic paper film 20 is located on the side of the substrate substrate 11 away from the data line 12. The first driving unit 13 and the second driving unit 14 are respectively exposed on the opposite side surfaces of the substrate substrate 11. Taking the second electronic paper film 30 and the data line 12 located on one side of the substrate substrate 11 as an example, the data line 12 can block and shield the first driving unit 13 and the second driving unit 14 exposed on the side of the substrate substrate 11 facing the second electronic paper film 30.Optionally, the data line 12 is attached to the side surface of the substrate 11 facing the second e-paper film 30 to shield the first driving unit 13 and the second driving unit 14 and make the first driving unit 13 and the second driving unit 14 not protrude from the side surface of the substrate 11 facing the data line 12, thereby increasing the display aperture ratio of the side of the substrate 11 on which the data line 12 is arranged.

[0037] In the above embodiment, the first driving unit 13 and the second driving unit 14 are embedded in the substrate 11 and respectively exposed on the opposite sides of the substrate 11, and are respectively connected with the data line 12 arranged on the side surface of the substrate 11, so that the first driving unit 13 and the second driving unit 14 can be controlled by the data line 12 on the side surface of the substrate 11 to drive the first e-paper film 20 and the second e-paper film 30. Thus, the first e-paper film 20 and the second e-paper film 30 can be independently displayed under the driving of the first driving unit 13 and the second driving unit 14 respectively, while the first driving unit 13 and the second driving unit 14 can be controlled by the same data line 12, and the data line 12 is located on one side of the substrate 11, so that the display aperture ratio of the side of the driving substrate 10 on which the data line 12 is not arranged is improved, further, the side of the driving substrate 10 on which the data line 12 is arranged does not need to be arranged with driving units, thereby improving the display aperture ratio of the side of the driving substrate 10 on which the data line 12 is arranged, reducing the thickness of the e-paper display device 1, and the production process is simpler.

[0038] In some embodiments, the driving substrate 10 further comprises a first insulating layer 15 arranged on the side of the substrate 11 away from the data line 12, and arranged in the same layer as the first driving unit 13 and the second driving unit 14, and at least partially filled between the first driving unit 13 and the second driving unit 14. The material of the first insulating layer 15 can include but is not limited to silicon oxide (SiO2), silicon nitride (Si3N4), silicon oxynitride (Si2N2O), or a combination thereof. For example, the first insulating layer 15 can be at least partially filled between the intervals of the first driving unit 13 and the second driving unit 14, so that the first driving unit 13 and the second driving unit 14 are electrically isolated, reducing the risk of electrical interference between the first driving unit 13 and the second driving unit 14, so that the first driving unit 13 and the second driving unit 14 drive the first e-paper film 20 and the second e-paper film 30 respectively.

[0039] In some embodiments, the driving substrate 10 further comprises a second insulating layer 16 and a first driving layer group 17, the second insulating layer 16 is arranged on the side of the first insulating layer 15 away from the substrate 11, and the first driving layer group 17 is arranged on the side of the second insulating layer 16 away from the first insulating layer 15, and the first driving layer group 17 is used to drive the first electronic paper film 20 in cooperation with the first driving unit 13. The material of the second insulating layer 16 can include but is not limited to silicon oxide (SiO2), silicon nitride (Si3N4), silicon oxynitride (Si2N2O) or a combination thereof. The first driving layer group 17 can drive the first electronic paper film 20 in cooperation with the first driving unit 13. It can be understood that the first driving layer group 17 can receive a driving signal from the first driving unit 13, thereby driving the first electronic paper film 20. For example, when the first driving unit 13 is turned on, the voltage signal on the data line 12 can be transmitted to the first driving layer group 17, and the first driving layer group 17 can drive the first electronic paper film 20 according to the voltage signal. The first driving layer group 17 is spaced from the first insulating layer 15 by the second insulating layer 16, and the first driving unit 13 and the second driving unit 14 are arranged in the same layer as the first insulating layer 15, so that the first driving layer group 17 is spaced from the first driving unit 13 and the second driving unit 14 by the second insulating layer 16, so that the first driving layer group 17 is electrically isolated from the first driving unit 13 and the second driving unit 14, reducing the risk of electrical interference between the first driving layer group 17 and the first driving unit 13 and the second driving unit 14, and improving the stability of the first electronic paper film 20 display.

[0040] In some embodiments, the first driving layer group 17 includes a first common electrode 171, a third insulating layer 172, and a first driving electrode 173. The first common electrode 171 is disposed on the side of the second insulating layer 16 away from the first insulating layer 15. The third insulating layer 172 is disposed on the side of the second insulating layer 16 away from the first insulating layer 15 and covers the first common electrode 171. The first driving electrode 173 is disposed on the side of the third insulating layer 172 away from the second insulating layer 16, and the first driving electrode 173 is electrically connected to the first driving unit 13. The first driving electrode 173 and the first common electrode 171 are correspondingly disposed. In some application scenarios, the orthographic projection of the first common electrode 171 and the first driving electrode 173 on the substrate 11 can at least partially coincide. A voltage difference can be formed between the first common electrode 171 and the first driving electrode 173, so that the microcapsules on the first e-paper film 20 are driven by the voltage difference to display a picture on the first e-paper film 20. The first common electrode 171 is electrically isolated from the first driving unit 13 and the second driving unit 14 by the second insulating layer 16, and the first driving electrode 173 is separated from the first common electrode 171 by the third insulating layer 172, reducing the risk of electrical interference such as short circuit between the first driving electrode 173 and the first common electrode 171, thereby facilitating the formation of a stable voltage difference between the first driving electrode 173 and the first common electrode 171 to drive the first e-paper film 20. It can be understood that the voltage difference between the first common electrode 171 and the first driving electrode 173 can correspond to the display picture of the first e-paper film 20, and different voltage differences between the first common electrode 171 and the first driving electrode 173 can be controlled to display different pictures on the first e-paper film 20.

[0041] In some embodiments, the first insulating layer 15, the second insulating layer 16, and the third insulating layer 172 are each provided with a first via hole 101, and the first driving electrode 173 extends into the first via hole 101 to be electrically connected to the first driving unit 13. In some application scenarios, the first via hole 101 can penetrate the first insulating layer 15, the second insulating layer 16, and the third insulating layer 172 from the thickness direction, so that the first driving electrode 173 can pass through the third insulating layer 172, the second insulating layer 16, and the first insulating layer 15 in sequence to be electrically connected to the first driving unit 13, thereby facilitating the first driving electrode 173 to receive a data signal from the first driving unit 13.

[0042] In some embodiments, the substrate 11 has a first through hole 111 penetrating through two opposite surfaces of the substrate 11, the first driving unit 13 includes a first gate 131, a first active layer 132 and a first source electrode 133, the first source electrode 133 is arranged on the side of the substrate 11 away from the data line 12 and surrounds the first through hole 111, and the first source electrode 133 is electrically connected with the first driving electrode 173; the first active layer 132 includes a first embedded part 1321 and a first surrounding part 1322, the first surrounding part 1322 is arranged on the side of the first source electrode 133 away from the substrate 11, the first surrounding part 1322 is connected with the first embedded part 1321 and is arranged around the first embedded part 1321, the first embedded part 1321 is embedded in the first through hole 111 and connected with the data line 12, and the first embedded part 1321 is formed with a first accommodating groove 1323; the first gate 131 is at least partially inserted into the first accommodating groove 1323, and the first gate 131 is spaced from the first active layer 132 by the first insulating layer 15. The first through hole 111 penetrating through two opposite surfaces of the substrate can be formed on the substrate 11 by a method including but not limited to laser drilling. The first source electrode 133 can be arranged around the first through hole 111, the first embedded part 1321 of the first active layer 132 can be embedded in the first through hole 111 and connected with the data line 12, in some application scenarios, the first embedded part 1321 can be connected with the data line 12 through the bottom wall part of the first accommodating groove 1323 formed by the first embedded part 1321. The first surrounding part 1322 is located on the side of the first source electrode 133 away from the substrate 11 and is connected with the first embedded part 1321, and the first active layer 132 can be overlapped with the first source electrode 133 through the first surrounding part 1322. It can be understood that the first embedded part 1321 can be connected with the data line 12 and the first source electrode 133 at the same time, so as to receive the data signal from the data line 12 and transmit the data signal to the first source electrode 133. The first surrounding part 1322 can further increase the contact area of the first active layer 132 and the first source electrode 133, so as to improve the connection stability of the first active layer 132 and the first source electrode 133 in cooperation with the first embedded part 1321. Further, the first source electrode 133 is electrically connected with the first driving electrode 173, which facilitates the first source electrode 133 to drive the first electronic paper film 20 according to the data signal in cooperation with the first driving electrode 173. It can be understood that the first driving electrode 173 can form a corresponding voltage difference between the first source electrode 133 and the first common electrode 171 according to the data signal received by the first source electrode 133. The first gate 131 is at least partially inserted into the first accommodating groove 1323 and is spaced from the first active layer 132 by the first insulating layer 15, and the first gate 131 can be used to control the switching of the first driving unit 13. For example, the first driving unit 13 can be turned on by providing a corresponding voltage to the first gate 131, and when the first driving unit 13 is turned on, the first source electrode 133 can receive the data signal from the data line 12 through the first active layer 132.The first insulating layer 15 can be at least partially filled between the first active layer 132 and the first gate 131, so as to reduce the risk of short circuit between the first gate 131 and the first active layer 132, and improve the reliability of the first driving unit 13. In some application scenarios, as viewed in a direction perpendicular to the substrate 11, the first source 133 surrounds the first active layer 132, the first active layer 132 surrounds the first gate 131, and the first gate 131 and the first active layer 132 are separated by the first insulating layer 15. Thus, the first driving unit 13 has a smaller volume, so as to reduce the proportion of space occupied by the first driving unit 13, and facilitate further increasing the display aperture ratio.

[0043] In some embodiments, the driving substrate 10 further comprises a second driving layer group 18, the second driving layer group 18 comprising a second common electrode 181, a fourth insulating layer 182 and a second driving electrode 183, the second common electrode 181 being disposed on the side of the substrate 11 facing the data lines 12, the fourth insulating layer 182 being located on the side of the substrate 11 facing the data lines 12 and covering the data lines 12 and the second common electrode 181, and the second driving electrode 183 being disposed on the side of the fourth insulating layer 182 away from the substrate 11, the second driving layer group 18 being configured to drive the second electronic paper film 30 in cooperation with the second driving unit 14. The second driving electrode 183 and the second common electrode 181 are correspondingly arranged, and in some application scenarios, the orthographic projection of the second common electrode 181 and the second driving electrode 183 on the substrate 11 can at least partially coincide. A voltage difference can be formed between the second common electrode 181 and the second driving electrode 183, so as to drive the microcapsules on the second electronic paper film 30 through the voltage difference, to make the second electronic paper film 30 display a picture. The second common electrode 181 is separated from the first driving unit 13 and the second driving unit 14 by the substrate 11, and the second driving electrode 183 is electrically isolated from the second common electrode 181 by the fourth insulating layer 182, so as to reduce the risk of electrical interference such as short circuit between the second driving electrode 183 and the second common electrode 181, and facilitate the formation of a stable voltage difference between the second driving electrode 183 and the second common electrode 181 to drive the second electronic paper film 30. It can be understood that the voltage difference between the second common electrode 181 and the second driving electrode 183 can correspond to the display picture of the second electronic paper film 30, and different voltage differences between the second common electrode 181 and the second driving electrode 183 can be controlled to make the second electronic paper film 30 display different pictures.

[0044] In some embodiments, the driving substrate 10 further comprises a conductive part 19, the substrate 11 is provided with a second through hole 102 penetrating through both sides of the substrate 11, the conductive part 19 is provided in the same layer as the data line 12 and corresponds to the second through hole 102, the second driving unit 14 extends into the second through hole 102 to be electrically connected with the conductive part 19, and the conductive part 19 is further electrically connected with the second driving electrode 183. In some application scenarios, the second through hole 102 penetrating through the opposite surfaces of the substrate 11 can be formed by means including but not limited to laser drilling. The conductive part 19 can be provided on the side of the substrate 11 facing the data line 12, the second driving unit 14 can extend into the second through hole 102 and be electrically connected with the conductive part 19, and the conductive part 19 is further electrically connected with the second driving electrode 183. Thus, the second driving unit 14 can be electrically connected with the second driving electrode 183 through the conductive part 19, so as to drive the second electronic paper film 30 in cooperation with the second driving electrode 183, and the conductive part 19 improves the stability of the connection between the second driving unit 14 and the second driving electrode 183.

[0045] In some embodiments, the substrate 11 has a second through hole 112 penetrating through two opposite surfaces of the substrate 11, the second driving unit 14 includes a second gate 141, a second active layer 142 and a second source 143, the second source 143 is arranged on the side of the substrate 11 away from the data line 12 and surrounds the second through hole 112, and the second source 143 is electrically connected with the conductive part 19; the second active layer 142 includes a second embedded part 1421 and a second surrounding part 1422, the second surrounding part 1422 is arranged on the side of the second source 143 away from the substrate 11, the second surrounding part 1422 is connected with the second embedded part 1421 and is arranged around the second embedded part 1421, the second embedded part 1421 is embedded in the second through hole 112 and is connected with the data line 12, and the second embedded part 1421 forms a second accommodating groove 1423; the second gate 141 is at least partially inserted into the second accommodating groove 1423, and the second gate 141 is spaced from the second active layer 142 by the first insulating layer 15. The second through hole 112 penetrating through two opposite surfaces of the substrate can be formed on the substrate 11 by a method including but not limited to laser drilling. The second source 143 can be arranged around the second through hole 112, the second embedded part 1421 of the second active layer 142 can be embedded in the second through hole 112 and connected with the data line 12, in some application scenarios, the second embedded part 1421 can be connected with the data line 12 through the bottom wall of the second accommodating groove 1423 formed by the second embedded part 1421. The second surrounding part 1422 is located on the side of the second source 143 away from the substrate 11 and is connected with the second embedded part 1421, and the second active layer 142 can be overlapped with the second source 143 through the second surrounding part 1422. It can be understood that the second embedded part 1421 can be connected with the data line 12 and the second source 143 at the same time, so as to receive the data signal from the data line 12 and transmit the data signal to the second source 143. The second surrounding part 1422 can further increase the contact area of the second active layer 142 and the second source 143, so as to improve the connection stability of the second active layer 142 and the second source 143 in cooperation with the second embedded part 1421. Further, the second source 143 is electrically connected with the second driving electrode 183, which facilitates the second source 143 to drive the second electronic paper film 30 according to the data signal in cooperation with the second driving electrode 183. It can be understood that the second driving electrode 183 can form a corresponding voltage difference between the second source 143 and the second common electrode 181 according to the data signal received by the second source 143. The second gate 141 is at least partially inserted into the second accommodating groove 1423 and is spaced from the second active layer 142 by the first insulating layer 15, and the second gate 141 can be used to control the switching of the second driving unit 14. For example, the second driving unit 14 can be turned on by providing a corresponding voltage to the second gate 141, and when the second driving unit 14 is turned on, the second source 143 can receive the data signal from the data line 12 through the second active layer 142.The first insulating layer 15 can at least partially fill between the second active layer 142 and the second gate 141, thereby reducing the risk of short circuit between the second gate 141 and the second active layer 142, and improving the reliability of the second driving unit 14. In some application scenarios, as viewed in a direction perpendicular to the substrate 11, the second source 143 surrounds the second active layer 142, the second active layer 142 surrounds the second gate 141, and the second gate 141 and the second active layer 142 are separated by the first insulating layer 15. Thus, the volume of the second driving unit 14 is small, thereby reducing the space occupied by the second driving unit 14 and facilitating further increase of the display aperture ratio. It can be understood that the first driving unit 13 and the second driving unit 14 can independently drive the first electronic paper film 20 and the second electronic paper film 30, respectively. For example, the first electronic paper film 20 and the second electronic paper film 30 can simultaneously display the same picture; or the first electronic paper film 20 and the second electronic paper film 30 simultaneously display different pictures; or the first electronic paper film 20 displays a picture and the second electronic paper film 30 does not display; or the first electronic paper film 20 does not display and the second electronic paper film 30 displays a picture; or neither the first electronic paper film 20 nor the second electronic paper film 30 displays a picture.

[0046] In some embodiments, the fourth insulating layer 182 is provided with a third via hole 103 communicating the second driving electrode 183 and the conductive part 19, and the second driving electrode 183 extends into the third via hole 103 to be electrically connected with the conductive part 19. Thus, the second driving electrode 183 is facilitated to be electrically connected with the conductive part 19 through the third via hole 103 to receive the data signal from the second driving unit 14.

[0047] Please refer to Figure 3 , Figure 3 is a schematic diagram of the wiring of the first common electrode of the electronic paper display device according to one or more embodiments of the present application.

[0048] In some embodiments, the first common electrode 171 and the second common electrode 181 respectively extend in a first direction x1 and a second direction x2 parallel to the substrate 11, wherein the first direction x1 is perpendicular to the second direction x2. For example, one or both of the first common electrode 171 and the second common electrode 181 can form a mesh structure, so that each part of the first common electrode 171 is electrically connected with each other and has the same voltage, and each part of the second common electrode 181 is electrically connected with each other and has the same voltage. Thus, the uniformity of the first common electrode 171 and the second common electrode 181 is improved, thereby improving the stability of the picture of the first electronic paper film 20 and the second electronic paper film 30.

[0049] In summary, the electronic paper display device 1 provided in the application comprises a driving substrate 10, a first electronic paper film 20 and a second electronic paper film 30, the first electronic paper film 20 is laid on one side surface of the driving substrate 10, and the second electronic paper film 30 is laid on the other side surface of the driving substrate 10 away from the first electronic paper film 20. The driving substrate 10 comprises a substrate 11, a data line 12, a first driving unit 13 and a second driving unit 14. The first driving unit 13 is embedded in the substrate 11 and exposed on the two opposite side surfaces of the substrate 11 respectively. The second driving unit 14 is embedded in the substrate 11 and exposed on the two opposite side surfaces of the substrate 11 respectively. The second driving unit 14 is arranged at intervals with the first driving unit 13. The data line 12 is arranged on one side surface of the substrate 11. The first driving unit 13 and the second driving unit 14 are connected with the data line 12 respectively. The first electronic paper film 20 is connected with the first driving unit 13, and the second electronic paper film 30 is connected with the second driving unit 14. Through the above-mentioned embodiment, the first driving unit 13 and the second driving unit 14 are embedded in the substrate 11 and exposed on the two opposite side surfaces of the substrate 11 respectively, and are connected with the data line 12 respectively. The data line 12 is arranged on one side surface of the substrate 11, so that the first driving unit 13 and the second driving unit 14 can be controlled by the data line 12 on one side surface of the substrate 11 to drive the first electronic paper film 20 and the second electronic paper film 30. Therefore, the first electronic paper film 20 and the second electronic paper film 30 can be independently displayed under the driving of the first driving unit 13 and the second driving unit 14 respectively. Meanwhile, the first driving unit 13 and the second driving unit 14 can be controlled by the same data line 12, and the data line 12 is located on one side of the substrate 11, so that the data line 12 does not need to be arranged on both sides of the substrate 11, thereby improving the display aperture ratio of the side of the driving substrate 10 without the data line 12. Further, the side of the driving substrate 10 with the data line 12 does not need to be arranged with the driving unit, thereby improving the display aperture ratio of the side of the driving substrate 10 with the data line 12, reducing the thickness of the electronic paper display device 1, and simplifying the production process. Compared with other electronic paper display devices, the electronic paper display device 1 provided in the application has a larger aperture ratio, a smaller thickness and a lower production cost.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electronic paper display device, characterized by comprising: The electronic paper display device comprises a driving substrate; a first electronic paper film laid on one side surface of the driving substrate; a second electronic paper film laid on the other side surface of the driving substrate away from the first electronic paper film; The driving substrate comprises a substrate, a data line, a first driving unit and a second driving unit, the first driving unit is embedded in the substrate and exposed on both side surfaces of the substrate, the second driving unit is embedded in the substrate and exposed on both side surfaces of the substrate, the second driving unit is arranged apart from the first driving unit, the data line is arranged on one side surface of the substrate, the first driving unit and the second driving unit are connected with the data line, the first electronic paper film is connected with the first driving unit, and the second electronic paper film is connected with the second driving unit. The driving substrate further comprises a first insulating layer arranged on the side of the substrate away from the data line, and arranged in the same layer with the first driving unit and the second driving unit, and at least partially filled between the first driving unit and the second driving unit. The driving substrate further comprises a second insulating layer and a first driving layer group, the second insulating layer is arranged on the side of the first insulating layer away from the substrate, and the first driving layer group is arranged on the side of the second insulating layer away from the first insulating layer, and the first driving layer group is used to drive the first electronic paper film in cooperation with the first driving unit. The first driving layer group comprises a first common electrode, a third insulating layer and a first driving electrode, the first common electrode is arranged on the side of the second insulating layer away from the first insulating layer, the third insulating layer is arranged on the side of the second insulating layer away from the first insulating layer and covers the first common electrode, and the first driving electrode is arranged on the side of the third insulating layer away from the second insulating layer, and the first driving electrode is electrically connected with the first driving unit. The substrate has a first through hole penetrating through both side surfaces of the substrate, the first driving unit comprises a first gate, a first active layer and a first source, the first source is arranged on the side of the substrate away from the data line and surrounds the first through hole, and the first source is electrically connected with the first driving electrode. The first active layer comprises a first embedded part and a first surrounding part, the first surrounding part is arranged on the side of the first source away from the substrate, the first surrounding part is connected with the first embedded part and arranged around the first embedded part, the first embedded part is embedded in the first through hole and connected with the data line, and the first embedded part forms a first accommodating groove. The first gate is at least partially inserted into the first accommodating groove, and the first gate is spaced apart from the first active layer through the first insulating layer. 2.The electronic paper display device of claim 1, wherein, The first insulating layer, the second insulating layer and the third insulating layer are all provided with first through holes in communication with each other, and the first driving electrode extends into the first through hole to be electrically connected with the first driving unit.

3. The electronic paper display device according to any one of claims 1 or 2, wherein The driving substrate further comprises a second driving layer group, the second driving layer group comprises a second common electrode, a fourth insulating layer and a second driving electrode, the second common electrode is arranged on the side of the substrate substrate facing the data line, the fourth insulating layer is located on the side of the substrate substrate facing the data line and covers the data line and the second common electrode, the second driving electrode is arranged on the side of the fourth insulating layer away from the substrate substrate, and the second driving layer group is used to drive the second electronic paper film in cooperation with the second driving unit. 4.The electronic paper display device of claim 3, wherein, The driving substrate further comprises a conductive part, the substrate substrate is provided with a second via hole penetrating through both sides of the substrate substrate, the conductive part is arranged in the same layer as the data line and is arranged corresponding to the second via hole, the second driving unit extends into the second via hole to be electrically connected with the conductive part, and the conductive part is also electrically connected with the second driving electrode. 5.The electronic paper display device of claim 4, wherein, The substrate substrate has a second through hole penetrating through the opposite surfaces of the substrate substrate, the second driving unit comprises a second gate, a second active layer and a second source electrode, the second source electrode is arranged on the side of the substrate substrate away from the data line and surrounds the second through hole, and the second source electrode is electrically connected with the conductive part; The second active layer comprises a second embedded part and a second surrounding part, the second surrounding part is arranged on the side of the second source electrode away from the substrate substrate, the second surrounding part is connected with the second embedded part and arranged around the second embedded part, the second embedded part is embedded in the second through hole and connected with the data line, and the second embedded part is formed with a second accommodating groove; The second gate is at least partially inserted into the second accommodating groove, and the second gate is spaced from the second active layer through the first insulating layer. 6.The electronic paper display device of claim 4, wherein, The fourth insulating layer is provided with a third via hole communicating the second driving electrode and the conductive part, and the second driving electrode extends into the third via hole to be electrically connected with the conductive part.

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