Electronic paper display device and control method

Abstract

The application discloses an electronic paper display device and a control method. 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 driving unit, a first driving electrode, a second driving electrode, a first common electrode and a second common electrode. The driving unit is embedded in the substrate and exposed on two opposite side surfaces of the substrate. The first driving electrode is connected to the driving unit and the first electronic paper film. The first common electrode is arranged on the side of the substrate facing the first electronic paper film. The second driving electrode is connected to the driving unit and the second electronic paper film. The second common electrode is arranged on the side of the substrate facing the second electronic paper film. One driving unit can drive the first electronic paper film and the second electronic paper film to display, thereby reducing the thickness and the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an electronic paper display device and a control method. 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 have the same readability and portability as printed matter.

[0003] The electronic paper screen displays patterns by reflecting ambient light, and has a paper printing 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, the known electronic paper display devices currently need to use different driving units to drive the display of the two sides respectively, thereby resulting in a larger thickness, higher cost, and lower display aperture ratio. 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 driving unit, a first driving electrode, a second driving electrode, a first common electrode and a second common electrode. The driving unit is embedded in the substrate and is exposed on the two opposite side surfaces of the substrate. The first driving electrode is connected to the driving unit and the first electronic paper film. The first common electrode is arranged on the side of the substrate facing the first electronic paper film. The second driving electrode is connected to the driving unit and the second electronic paper film. The second common electrode is arranged on the side of the substrate facing the second electronic paper film. The driving unit is used to drive the first electronic paper film to work through the first driving electrode and the first common electrode, and to drive the second electronic paper film to work through the second driving electrode and the second common electrode.

[0007] In some embodiments, the first common electrode comprises a plurality of first sub-electrodes, and the plurality of first sub-electrodes are arranged at intervals. Each first sub-electrode is connected to a control chip.

[0008] In some embodiments, the second common electrode comprises a plurality of second sub-electrodes, one second sub-electrode is electrically connected with other second sub-electrodes adjacent to it.

[0009] In some embodiments, the driving substrate further comprises a first insulating layer, the first insulating layer is arranged on the side of the substrate facing the first electronic paper film and covers the first common electrode, and the first driving electrode is arranged on the side of the first insulating layer away from the first common electrode.

[0010] In some embodiments, the driving substrate further comprises a second insulating layer, the second insulating layer is arranged on the side of the substrate facing the second electronic paper film and covers the second common electrode, and the second driving electrode is arranged on the side of the second insulating layer away from the second common electrode.

[0011] In some embodiments, the driving substrate further comprises a conductive part, the substrate is provided with a through hole penetrating through the two opposite surfaces of the substrate, the conductive part is arranged on the side of the substrate away from the first driving electrode and corresponds to the through hole, and the conductive part is connected with the driving unit and the second driving electrode respectively.

[0012] In some embodiments, the driving unit comprises a data line, and the data line is arranged on the side surface of the substrate facing the second common electrode.

[0013] In some embodiments, the substrate has a through hole penetrating through the two opposite surfaces of the substrate, the driving unit comprises a gate, an active layer and a source, the source is arranged on the side of the substrate away from the data line and surrounds the through hole, the source is connected with the first driving electrode and the second driving electrode respectively, the active layer comprises an embedded part and a surrounding part, the surrounding part is arranged on the side of the source away from the substrate, the surrounding part is connected with the embedded part and arranged around the embedded part, the embedded part is embedded in the through hole and connected with the data line, and the embedded part is formed with a receiving groove, and the gate is at least partially inserted into the receiving groove, and the gate is spaced from the active layer by the first insulating layer.

[0014] To solve the above problems, the application further provides a control method of the electronic paper display device, the control method comprising: monitoring whether the driving voltage of the driving unit changes; in response to the driving voltage not changing, controlling the electronic paper display device to display in a first working mode; wherein in the first working mode, the voltages of the first driving electrode and the second driving electrode are the same, and the voltages of the first common electrode and the second common electrode are the same; in response to the driving voltage changing, controlling the electronic paper display device to display in a second working mode; wherein in the second working mode, the voltages of the first driving electrode and the second driving electrode are the same, and the voltages of the first common electrode and the second common electrode are different.

[0015] In some embodiments, after the step of controlling the electronic paper display device to display in the second working mode, the control method comprises: in response to the second common electrode being at the first working voltage, determining a first driving voltage of the driving unit according to the target voltage difference and the first common voltage of the first common electrode; in response to the second common electrode being adjusted from the first working voltage to the second working voltage, adjusting the first driving voltage of the driving unit to a second driving voltage according to the second working voltage; adjusting the first common voltage of the first common electrode to a second common voltage according to the target voltage difference and the pressure difference between the first driving voltage and the second driving voltage.

[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, a driving unit, a first driving electrode, a second driving electrode, a first common electrode and a second common electrode, the driving unit is embedded in the substrate and is exposed on the two opposite side surfaces of the substrate respectively, the first driving electrode is connected to the driving unit and the first electronic paper film, the first common electrode is arranged on the side of the substrate facing the first electronic paper film, the second driving electrode is connected to the driving unit and the second electronic paper film, and the second common electrode is arranged on the side of the substrate facing the second electronic paper film, the driving unit is used to drive the first electronic paper film to work through the first driving electrode and the first common electrode, and is used to drive the second electronic paper film to work through the second driving electrode and the second common electrode. Through the above-mentioned implementation, the driving unit cooperates with the first driving electrode and the first common electrode, the second driving electrode and the second common electrode to drive the first electronic paper film and the second electronic paper film respectively. Therefore, one driving unit can drive the first electronic paper film and the second electronic paper film to display respectively, which reduces the thickness of the electronic paper display device, reduces the cost, and improves the display aperture ratio at the same time. 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 drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[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 a structural schematic diagram of an electronic paper display device according to Figure 1 the electronic paper display device shown in FIG. 1 is a cross-sectional view along the A-A direction;

[0020] Figure 3 is an equivalent circuit diagram of an electronic paper display device according to one or more embodiments of the present application;

[0021] Figure 4 is a layout schematic diagram of a first sub-electrode of an electronic paper display device according to one or more embodiments of the present application;

[0022] Figure 5 is a layout schematic diagram of a second sub-electrode of an electronic paper display device according to one or more embodiments of the present application;

[0023] Figure 6 is a flow schematic diagram of a control method according to one or more embodiments of the present application.

[0024] FIG. 1 is an electronic paper display device; FIG. 2 is a cross-sectional view of the electronic paper display device; FIG. 3 is a layout schematic diagram of a first sub-electrode of the electronic paper display device; FIG. 4 is a layout schematic diagram of a second sub-electrode of the electronic paper display device; FIG. 5 is a layout schematic diagram of a first driving electrode of the electronic paper display device; FIG. 6 is a layout schematic diagram of a second driving electrode of the electronic paper display device; FIG. 7 is a layout schematic diagram of a first common electrode of the electronic paper display device; FIG. 8 is a layout schematic diagram of a second common electrode of the electronic paper display device; FIG. 9 is a layout schematic diagram of a first insulating layer of the electronic paper display device; FIG. 10 is a layout schematic diagram of a second insulating layer of the electronic paper display device; FIG. 11 is a layout schematic diagram of a conductive part of the electronic paper display device; FIG. 12 is a layout schematic diagram of a first electronic paper film of the electronic paper display device; FIG. 13 is a layout schematic diagram of a second electronic paper film of the electronic paper display device; FIG. 14 is a layout schematic diagram of a control chip of the electronic paper display device; FIG. 15 is a flow schematic diagram of a control method according to one or more embodiments of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the technical solutions of the present application will be described in detail below with reference to 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.

[0026] 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 of the present application, 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 not exclusive inclusion.

[0027] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0028] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0029] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0030] In the description of the embodiments of the application, the term“a plurality of” means more than two (including two), and similarly, “a plurality of groups” means more than two groups (including two groups), and “a plurality of pieces” means more than two pieces (including two pieces).

[0031] In the description of the embodiments of the 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 based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0032] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; 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 of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0033] 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 harm the eyes has been widely used. Modern electronic paper display has developed to have the same readability and portability as printed matter.

[0034] Electronic paper screen displays patterns by reflecting ambient light, and has a paper-printing-like effect. Compared with traditional transmissive liquid crystal display, electronic paper display does not need backlight, is easy to read, and is still clear even in sunlight. Since electronic paper display does not need a backlight module, it can ensure eye health and is more eye-friendly to use, and has an advantage of smaller thickness and weight than traditional display.

[0035] Based on various advantages of electronic paper, the application scenarios of electronic paper will become more and more extensive. However, the known electronic paper display device needs to use different driving units to respectively drive the display of two sides, thereby resulting in a large thickness, a high cost, and a low display aperture ratio.

[0036] Please refer to Figures 1-5 , 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 a sectional view of the electronic paper display device shown in Figure 1 along the A-A direction; Figure 3 is an equivalent circuit diagram of an electronic paper display device according to one or more embodiments of the present application; Figure 4 is a schematic diagram of the arrangement of a first sub-electrode of an electronic paper display device according to one or more embodiments of the present application; Figure 5 is a schematic diagram of the arrangement of a second sub-electrode of an electronic paper display device according to one or more embodiments of the present application.

[0037] 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; wherein the driving substrate 10 comprises a substrate substrate 11, a driving unit 12, a first driving electrode 13, a second driving electrode 14, a first common electrode 15 and a second common electrode 16. The driving unit 12 is embedded in the substrate substrate 11 and is exposed on the opposite side surfaces of the substrate substrate 11 respectively. The first driving electrode 13 is connected to the driving unit 12 and the first electronic paper film 20. The first common electrode 15 is arranged on the side of the substrate substrate 11 facing the first electronic paper film 20. The second driving electrode 14 is connected to the driving unit 12 and the second electronic paper film 30. The second common electrode 16 is arranged on the side of the substrate substrate 11 facing the second electronic paper film 30. The driving unit 12 is used to drive the first electronic paper film 20 to work through the first driving electrode 13 and the first common electrode 15, and to drive the second electronic paper film 30 to work through the second driving electrode 14 and the second common electrode 16.

[0038] The first e-paper film 20 can include a plurality of microcapsules, each of which is composed of positive and negative charged particles. Exemplarily, in some application scenarios, when a negative electric field is applied to both ends of the microcapsule, the white particles with positive charge move to the negative pole of the electric field under the action of the electric field, while the particles with negative charge 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 pictures through different driving states of the plurality of microcapsules.

[0039] The driving substrate 10 can be used to drive the first e-paper film 20 and the second e-paper film 30 to make the first e-paper film 20 and the second e-paper film 30 display pictures, specifically, the driving substrate 10 can be used to drive the plurality of microcapsules on the first e-paper film 20 and the second e-paper film 30. The driving substrate 10 includes a substrate substrate 11, a driving unit 12, a first driving electrode 13, a second driving electrode 14, a first common electrode 15 and a second common electrode 16, wherein the substrate substrate 11 can be a glass substrate, or a flexible substrate, and the material of the flexible substrate is polyimide (PI). The driving unit 12 can include a thin film transistor (TFT) device and a capacitor. Among them, TFT (Thin Film Transistor), namely thin film field effect transistor, is the most basic and important three-terminal electronic component in the semiconductor industry, which has been widely used in consumer products such as flat panel display and radio frequency tag. Each pixel relies on TFT for switching and driving. According to the difference of the semiconductor material of the active layer of TFT, the TFT device can be low temperature poly-silicon (LTPS) type, or metal oxide semiconductor (MOS) type, such as metal oxide semiconductor type of indium gallium zinc oxide (IGZO).

[0040] The first driving electrode 13 and the first common electrode 15 can be correspondingly and spacedly arranged, and the second driving electrode 14 and the second common electrode 16 can be correspondingly and spacedly arranged. In some application scenarios, the orthographic projection of the first driving electrode 13 and the first common electrode 15 on the substrate 11 can at least partially coincide; the orthographic projection of the second driving electrode 14 and the second common electrode 16 on the substrate 11 can also at least partially coincide. A voltage difference can be formed between the first driving electrode 13 and the first common electrode 15, so as to drive the microcapsules on the first electronic paper film 20 through the voltage difference, so as to make the first electronic paper film 20 display a picture. A voltage difference can be formed between the second driving electrode 14 and the second common electrode 16, so as to drive the microcapsules on the second electronic paper film 30 through the voltage difference, so as to make the second electronic paper film 30 display a picture. It can be understood that the voltage difference between the first common electrode 15 and the first driving electrode 13 can correspond to the display picture of the first electronic paper film 20, and different voltage differences between the first common electrode 15 and the first driving electrode 13 can be controlled to make the first electronic paper film 20 display different pictures; the voltage difference between the second common electrode 16 and the second driving electrode 14 can correspond to the display picture of the second electronic paper film 30, and different voltage differences between the second common electrode 16 and the second driving electrode 14 can be controlled to make the second electronic paper film 30 display different pictures.

[0041] Through the above implementation, the driving unit 12 cooperates with the first driving electrode 13 and the first common electrode 15, and the second driving electrode 14 and the second common electrode 16 to drive the first electronic paper film 20 and the second electronic paper film 30, respectively. Thus, one driving unit 12 can drive the first electronic paper film 20 and the second electronic paper film 30 to display, respectively, thereby reducing the thickness of the electronic paper display device 1, reducing the cost, and improving the display aperture ratio.

[0042] In some embodiments, the first common electrode 15 includes a plurality of first sub-electrodes 151, and the plurality of first sub-electrodes 151 are spacedly arranged with each other. Each first sub-electrode 151 is connected with the control chip 40, respectively. The plurality of first sub-electrodes 151 are electrically isolated with each other. In some application scenarios, the plurality of first sub-electrodes 151 can be arranged in an array when viewed in a direction perpendicular to the substrate 11. For example, the plurality of first sub-electrodes 151 can be arranged in a rectangular array. Each first sub-electrode 151 is connected with the control chip 40, respectively, and the control chip 40 can control the voltage on each first sub-electrode 151, respectively. Thus, the plurality of first sub-electrodes 151 in the first common electrode 15 can have independent voltages, thereby improving the flexibility of voltage control of the first common electrode 15, and facilitating better control of the display picture of the first electronic paper film 20.

[0043] In some embodiments, the second common electrode 16 comprises a plurality of second sub-electrodes 161, one second sub-electrode 161 is electrically connected with other second sub-electrodes 161 adjacent to it. In some application scenarios, the plurality of second sub-electrodes 161 can be arranged in an array as viewed in a direction perpendicular to the substrate 11, for example, the plurality of second sub-electrodes 161 can be arranged in a rectangular array, one second sub-electrode 161 is electrically connected with other second sub-electrodes 161 adjacent to it in the rectangular array, for example, one second sub-electrode 161 is electrically connected with second sub-electrodes 161 adjacent to it in the lateral and longitudinal directions in the rectangular array. Thus, the voltage on the plurality of second sub-electrodes 161 of the second common electrode 16 is the same, which improves the uniformity of the second common electrode 16, thereby improving the stability of the display image of the second electronic paper film 30.

[0044] In some embodiments, the driving substrate 10 further comprises a first insulating layer 17, the first insulating layer 17 is disposed on the side of the substrate 11 facing the first electronic paper film 20 and covers the first common electrode 15, and the first driving electrode 13 is disposed on the side of the first insulating layer 17 away from the first common electrode 15. The material of the first insulating layer 17 can include but is not limited to silicon oxide (SiO2), silicon nitride (Si3N4), silicon oxynitride (Si2N2O), or a combination thereof. The first insulating layer 17 is located between the first common electrode 15 and the first driving electrode 13, thereby alleviating the risk of electrical interference such as short circuit between the first driving electrode 13 and the first common electrode 15, thereby facilitating the formation of a stable voltage difference between the first driving electrode 13 and the first common electrode 15 to drive the first electronic paper film 20. In some application scenarios, the first insulating layer 17 is also disposed in the same layer as the driving unit 12, thereby alleviating the risk of short circuit of the driving unit 12. Thus, the first insulating layer 17 improves the reliability of the electronic paper display device 1.

[0045] In some embodiments, the driving substrate 10 further comprises a second insulating layer 18, the second insulating layer 18 is disposed on the side of the substrate 11 facing the second electronic paper film 30 and covers the second common electrode 16, and the second driving electrode 14 is disposed on the side of the second insulating layer 18 away from the second common electrode 16. The material of the second insulating layer 18 can include but is not limited to silicon oxide (SiO2), silicon nitride (Si3N4), silicon oxynitride (Si2N2O), or a combination thereof. The second insulating layer 18 is located between the second common electrode 16 and the second driving electrode 14, thereby alleviating the risk of electrical interference such as short circuit between the second driving electrode 14 and the second common electrode 16, thereby facilitating the formation of a stable voltage difference between the second driving electrode 14 and the second common electrode 16 to drive the second electronic paper film 30. Thus, the second insulating layer 18 improves the reliability of the electronic paper display device 1.

[0046] In some embodiments, the driving substrate 10 further comprises a conductive part 19, the substrate 11 is provided with a through hole 101 penetrating through the two opposite surfaces of the substrate 11, the conductive part 19 is arranged on the side of the substrate 11 away from the first driving electrode 13 and is arranged corresponding to the through hole 101, and the conductive part 19 is connected with the driving unit 12 and the second driving electrode 14 respectively. In some application scenarios, the through hole 101 penetrating through the two opposite surfaces of the substrate 11 can be formed by a method including but not limited to laser drilling. The conductive part 19 is arranged on the side of the substrate 11 away from the first driving electrode 13, and the conductive part 19 is arranged corresponding to the through hole 101. For example, the conductive part 19 can block one end of the through hole 101 away from the first driving electrode 13. The driving unit 12 can extend into the through hole 101 and be electrically connected with the conductive part 19, and the conductive part 19 is also electrically connected with the second driving electrode 14. Therefore, the driving unit 12 can be electrically connected with the second driving electrode 14 through the conductive part 19, so as to drive the second electronic paper film 30 in cooperation with the second driving electrode 14 and the second common electrode 16. The conductive part 19 improves the stability of the connection between the driving unit 12 and the second driving electrode 14.

[0047] In some embodiments, the driving unit 12 comprises a data line 121, and the data line 121 is arranged on the side surface of the substrate 11 facing the second common electrode 16. The driving unit 12 can receive a data signal through the data line 121, and can drive the first electronic paper film 20 and the second electronic paper film 30 in cooperation with the first driving electrode 13, the first common electrode 15, the second driving electrode 14 and the second common electrode 16 according to the data signal. The driving unit 12 is embedded in the substrate 11, and the data line 121 is arranged on the side surface of the substrate 11 facing the second common electrode 16, which reduces the height of the driving unit 12 protruding from the substrate 11, thereby reducing the overall thickness of the driving substrate 10. At the same time, the other side of the substrate 11 does not need to be provided with the data line 121, which improves the display aperture ratio of the electronic paper display device 1.

[0048] In some embodiments, the substrate 11 has a through hole 111 penetrating through two opposite surfaces of the substrate 11, the driving unit 12 includes a gate 122, an active layer 123 and a source 124, the source 124 is arranged on the side of the substrate 11 away from the data line 121 and surrounds the through hole 111, the source 124 is connected with the first driving electrode 13 and the second driving electrode 14 respectively; the active layer 123 includes an embedded part 1231 and a surrounding part 1232, the surrounding part 1232 is arranged on the side of the source 124 away from the substrate 11, the surrounding part 1232 is connected with the embedded part 1231 and arranged around the embedded part 1231, the embedded part 1231 is embedded in the through hole 111 and connected with the data line 121, the embedded part 1231 is formed with a receiving groove 1233; the gate 122 is at least partially inserted into the receiving groove 1233, and the gate 122 is spaced from the active layer 123 by the first insulating layer 17. The through hole 111 penetrating through two opposite surfaces of the substrate can be formed on the substrate 11 by means including but not limited to laser drilling. The source 124 can be arranged around the through hole 111, and the embedded part 1231 of the active layer 123 can be embedded in the through hole 111 and connected with the data line 121. In some application scenarios, the embedded part 1231 can be connected with the data line 121 through the bottom wall of the receiving groove 1233 formed by the embedded part 1231. The surrounding part 1232 is located on the side of the source 124 away from the substrate 11 and connected with the embedded part 1231, and the active layer 123 can be overlapped with the source 124 through the surrounding part 1232. It can be understood that the embedded part 1231 can be connected with the data line 121 and the source 124 at the same time, so as to receive the data signal from the data line 121 and transmit the data signal to the source 124. The surrounding part 1232 can further increase the contact area of the active layer 123 and the source 124, so as to improve the connection stability of the active layer 123 and the source 124 in cooperation with the embedded part 1231. Further, the source 124 is electrically connected with the first driving electrode 13 and the second driving electrode 14, which facilitates the source 124 to drive the first electronic paper film 20 and the second electronic paper film 30 according to the data signal in cooperation with the first driving electrode 13 and the second driving electrode 14 respectively. It can be understood that the first driving electrode 13 can form a corresponding voltage difference between the first common electrode 15 according to the data signal received by the source 124, and the second driving electrode 14 can form a corresponding voltage difference between the second common electrode 16 according to the data signal received by the source 124. The gate 122 is at least partially inserted into the receiving groove 1233 and spaced from the active layer 123 by the insulating layer, and the gate 122 can be used to control the switch of the driving unit 12. For example, the driving unit 12 can be turned on by providing a corresponding voltage to the gate 122, and when the driving unit 12 is turned on, the source 124 can receive the data signal from the data line 121 through the active layer 123.The first insulating layer 17 can be at least partially filled between the active layer 123 and the gate 122, so as to reduce the risk of short circuit between the gate 122 and the active layer 123, and improve the reliability of the driving unit 12. In some application scenarios, as viewed in a direction perpendicular to the substrate 11, the source 124 surrounds the active layer 123, the active layer 123 surrounds the gate 122, and the gate 122 and the active layer 123 are separated by the insulating layer. Thus, the driving unit 12 has a smaller volume, so as to reduce the proportion of the space occupied by the driving unit 12, and facilitate further increasing the display aperture ratio.

[0049] Please refer to Figure 6 , Figure 6 is a flowchart of a control method according to one or more embodiments of the present application.

[0050] To solve the above problems, the present application also provides a control method of the electronic paper display device 1, the control method comprising:

[0051] Step S111: monitoring whether the driving voltage of the driving unit 12 changes.

[0052] The driving voltage of the driving unit 12 can refer to the received data voltage signal on the driving unit 12. In some application scenarios, the driving unit 12 can include a data line 121, and the driving voltage of the driving unit 12 can be the voltage signal on the data line 121. Specifically, the driving voltage of the driving unit 12 can be monitored at a preset frequency, for example, once every preset frame, or in real time.

[0053] Step S112: in response to the driving voltage not changing, controlling the electronic paper display device 1 to display in a first working mode; wherein in the first working mode, the voltages of the first driving electrode 13 and the second driving electrode 14 are the same, and the voltages of the first common electrode 15 and the second common electrode 16 are the same.

[0054] The driving voltage not changing can refer to the driving voltage at the current moment being the same as the driving voltage at the previous moment. For example, when the driving voltage of the driving unit 12 is monitored at a preset frequency, if the currently monitored driving voltage is the same as the previously monitored driving voltage, it can be considered that the driving voltage does not change. It can be understood that in the first working mode, the voltages of the first driving electrode 13 and the second driving electrode 14 are the same, and the voltages of the first common electrode 15 and the second common electrode 16 are the same, so the voltage difference between the first driving electrode 13 and the first common electrode 15 and the voltage difference between the second driving electrode 14 and the second common electrode 16 are the same, and thus the pictures displayed by the first electronic paper film 20 and the second electronic paper film 30 are also the same.

[0055] Step S113: in response to the change of the driving voltage, the electronic paper display device 1 is controlled to display in the second working mode; wherein in the second working mode, the voltage of the first driving electrode 13 and the second driving electrode 14 is the same, and the voltage of the first common electrode 15 and the second common electrode 16 is different.

[0056] The change of the driving voltage can mean that the driving voltage at the current moment is different from the driving voltage at the previous moment. For example, when the driving voltage of the driving unit 12 is monitored at a preset frequency, if the currently monitored driving voltage is different from the previously monitored driving voltage, it can be considered that the driving voltage has changed. It can be understood that in the second working mode, the voltage of the first driving electrode 13 and the second driving electrode 14 is the same, and the voltage of the first common electrode 15 and the second common electrode 16 is different, so the voltage difference between the first driving electrode 13 and the first common electrode 15 and the voltage difference between the second driving electrode 14 and the second common electrode 16 are different, and thus the pictures displayed by the first electronic paper film 20 and the second electronic paper film 30 are also different.

[0057] In some embodiments, after the above step S113, the control method further comprises: in response to the second common electrode 16 being at the first working voltage, determining the first driving voltage of the driving unit 12 according to the target voltage difference and the first common voltage of the first common electrode 15; in response to the second common electrode 16 being adjusted from the first working voltage to the second working voltage, adjusting the first driving voltage of the driving unit 12 to the second driving voltage according to the second working voltage; adjusting the first common voltage of the first common electrode 15 to the second common voltage according to the target voltage difference and the voltage difference between the first driving voltage and the second driving voltage.

[0058] In some application scenarios, the first working voltage of the first common electrode 15 can be 0 V, and the second working voltage of the second common electrode 16 can be 0 V. In this case, the first common electrode 15 and the second common electrode 16 are not applied with voltage, and there is no voltage difference between the first common electrode 15 and the first driving electrode 13 and between the second common electrode 16 and the second driving electrode 14. In this case, the first electronic paper film 20 and the second electronic paper film 30 do not display any picture.

[0059] In some application scenarios, the second common electrode 16 is adjusted from the first working voltage to the second working voltage, which can mean that the second common electrode 16 is adjusted from not being applied with voltage to being applied with a specific voltage, and a voltage difference can be formed between the second common electrode 16 and the second driving electrode 14. Specifically, adjusting the first driving voltage of the driving unit 12 to the second driving voltage according to the second working voltage can mean that the second driving voltage is determined according to the target voltage difference corresponding to the picture displayed by the second electronic paper film 30. For the second electronic paper film 30, the target voltage difference can be embodied as the voltage difference between the second driving electrode 14 and the second common electrode 16, and the second common electrode 16 is the second working voltage at this time. Therefore, the voltage of the second driving electrode 14 can be obtained according to the second working voltage and the target voltage difference of the second electronic paper film 30, and the voltage of the second driving electrode 14 is the same as the voltage of the driving unit 12, so as to determine the second driving voltage.

[0060] According to the target voltage difference and the voltage difference between the first driving voltage and the second driving voltage, the first common voltage of the first common electrode 15 is adjusted to the second common voltage. Specifically, it can refer to adjusting the first common voltage on the first common electrode 15 to the second common voltage, wherein the voltage difference between the second common voltage and the first common voltage is equal to the voltage difference between the first driving voltage and the second driving, and the voltage difference between the second common voltage and the second driving voltage is the same as the target voltage difference of the first electronic paper film 20. Thus, the first electronic paper film 20 and the second electronic paper film 30 can be simultaneously driven for display by the same driving unit 12, and the pictures displayed by the first electronic paper film 20 and the second electronic paper film 30 can be different.

[0061] In some embodiments, in the second working mode, the second common electrode 16 can be switched between the first working voltage and the second working voltage according to a preset period. For example, the preset period can be one frame, one half frame, or the like of the electronic paper film. Taking one frame as an example, in the first half frame, the second common electrode 16 can be at the first working voltage, and in the second half frame, the second common electrode 16 can be at the second working voltage. It can be understood that if the first working voltage is not applied to the second common electrode 16, in the first half frame, the first electronic paper film 20 displays a picture, and the second electronic paper film 30 can not display a picture. In the second half frame, the first electronic paper film 20 and the second electronic paper film 30 both display pictures, and the pictures displayed by the first electronic paper film 20 and the second electronic paper film 30 are different.

[0062] In summary, the electronic paper display device 1 of the present 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; 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; wherein the driving substrate 10 comprises a substrate 11, a driving unit 12, a first driving electrode 13, a second driving electrode 14, a first common electrode 15 and a second common electrode 16, the driving unit 12 is embedded in the substrate 11 and respectively exposed on the two opposite side surfaces of the substrate 11, the first driving electrode 13 is connected to the driving unit 12 and the first electronic paper film 20, the first common electrode 15 is arranged on the side of the substrate 11 facing the first electronic paper film 20, the second driving electrode 14 is connected to the driving unit 12 and the second electronic paper film 30, the second common electrode 16 is arranged on the side of the substrate 11 facing the second electronic paper film 30, the driving unit 12 is used to drive the first electronic paper film 20 to work through the first driving electrode 13 and the first common electrode 15, and is used to drive the second electronic paper film 30 to work through the second driving electrode 14 and the second common electrode 16. Through the above-mentioned embodiments, the driving unit 12 cooperates with the first driving electrode 13 and the first common electrode 15, the second driving electrode 14 and the second common electrode 16 to drive the first electronic paper film 20 and the second electronic paper film 30 respectively. Therefore, the first electronic paper film 20 and the second electronic paper film 30 can be driven to display respectively by one driving unit 12, which reduces the thickness of the electronic paper display device 1, reduces the cost, and improves the display aperture ratio at the same time. Compared with other electronic paper display devices, the electronic paper display device 1 of the present application has lower cost, thinner thickness and larger aperture ratio for double-sided display.

[0063] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. 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; wherein the driving substrate comprises a substrate, a driving unit, a first driving electrode, a second driving electrode, a first common electrode and a second common electrode, the driving unit is embedded in the substrate and exposed on the two opposite side surfaces of the substrate, the first driving electrode is connected to the driving unit and the first electronic paper film, the first common electrode is arranged on the side of the substrate facing the first electronic paper film, the second driving electrode is connected to the driving unit and the second electronic paper film, the second common electrode is arranged on the side of the substrate facing the second electronic paper film, the driving unit is used to drive the first electronic paper film to work through the first driving electrode and the first common electrode, and is used to drive the second electronic paper film to work through the second driving electrode and the second common electrode, the voltage of the first driving electrode and the second driving electrode is the same as the driving voltage of the driving unit; in the first working mode, the voltage of the first common electrode and the second common electrode is the same, so that the pictures displayed by the first electronic paper film and the second electronic paper film are the same; in the second working mode, the voltage of the first common electrode and the second common electrode is different, in response to the second common electrode being at a first working voltage, the driving unit being at a first driving voltage, wherein the first driving voltage is determined according to the target voltage difference of the first electronic paper film and the first common voltage of the first common electrode; in response to the second common electrode being adjusted from the first working voltage to a second working voltage, the driving unit being adjusted from the first driving voltage to a second driving voltage, and the first common electrode being adjusted from a first common voltage to a second common voltage, wherein the second common voltage is determined according to the target voltage difference of the first electronic paper film and the voltage difference between the first driving voltage and the second driving voltage, so that the pictures displayed by the first electronic paper film and the second electronic paper film are different; wherein the target voltage difference of the first electronic paper film corresponds to the target picture displayed by the first electronic paper film, and the target voltage difference of the first electronic paper film is the voltage difference between the first driving electrode and the first common electrode in the state that the first electronic paper film displays the target picture. 2.The electronic paper display device of claim 1, wherein, The first common electrode comprises a plurality of first sub-electrodes, and the plurality of first sub-electrodes are arranged at intervals. 3.The electronic paper display device according to claim 1 or 2, characterized by The second common electrode comprises a plurality of second sub-electrodes, and one second sub-electrode is electrically connected to other second sub-electrodes adjacent to it. 4.The electronic paper display device of claim 1, wherein, The driving substrate further comprises a first insulating layer arranged on the side of the substrate facing the first electronic paper film and covering the first common electrode, and the first driving electrode is arranged on the side of the first insulating layer away from the first common electrode. 5.The electronic paper display device of claim 4, wherein, The driving substrate further comprises a second insulating layer, the second insulating layer is arranged on the side of the substrate facing the second electronic paper film and covers the second common electrode, and the second driving electrode is arranged on the side of the second insulating layer away from the second common electrode. 6.The electronic paper display device of claim 5, wherein, The driving substrate further comprises a conductive part, the substrate is provided with a through hole penetrating through the opposite surfaces of the substrate, the conductive part is arranged on the side of the substrate away from the first driving electrode and is arranged corresponding to the through hole, and the conductive part is connected to the driving unit and the second driving electrode respectively. 7.The electronic paper display device of claim 4, wherein, The driving unit comprises a data line, and the data line is arranged on the side surface of the substrate facing the second common electrode. 8.The electronic paper display device of claim 7, wherein, The substrate has a through hole penetrating through the opposite surfaces of the substrate, the driving unit comprises a gate, an active layer and a source, the source is arranged on the side of the substrate away from the data line and surrounds the through hole, and the source is connected to the first driving electrode and the second driving electrode respectively; The active layer comprises an embedded part and a surrounding part, the surrounding part is arranged on the side of the source away from the substrate, the surrounding part is connected to the embedded part and arranged around the embedded part, the embedded part is embedded in the through hole and connected to the data line, and the embedded part is formed with a receiving groove; The gate is at least partially inserted into the receiving groove, and the gate is spaced from the active layer by the first insulating layer.

9. A control method of the electronic paper display device according to any one of claims 1 to 8, characterized by, The control method comprises: monitoring whether the driving voltage of the driving unit changes; in response to the driving voltage not changing, controlling the electronic paper display device to display in a first working mode; wherein in the first working mode, the voltages of the first driving electrode and the second driving electrode are the same, and the voltages of the first common electrode and the second common electrode are the same; in response to the driving voltage changing, controlling the electronic paper display device to display in a second working mode; wherein in the second working mode, the voltages of the first driving electrode and the second driving electrode are the same, and the voltages of the first common electrode and the second common electrode are different.

10. The control method according to claim 9, characterized by, After the step of controlling the electronic paper display device to display in the second working mode, the control method comprises: in response to the second common electrode being at a first working voltage, determining a first driving voltage of the driving unit according to a target voltage difference and a first common voltage of the first common electrode; in response to the second common electrode being adjusted from the first working voltage to a second working voltage, adjusting the first driving voltage of the driving unit to a second driving voltage according to the second working voltage; adjusting the first common voltage of the first common electrode to a second common voltage according to the target voltage difference and the voltage difference between the first driving voltage and the second driving voltage.

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