Touch display panel, preparation method and touch display device

Abstract

The invention belongs to the technical field of display, and particularly relates to a touch display panel, a preparation method and a touch display device.The touch display panel comprises a substrate, a driving circuit layer and an electronic paper film; the driving circuit layer comprises a common electrode unit, a pixel electrode block and a connecting signal line; the electronic paper film comprises a plurality of electrophoresis units, each electrophoresis unit comprises a micro-capsule structure, a first conductive electrode, a second conductive electrode and a third conductive electrode, and the third conductive electrode is connected with the connecting signal line; the second conductive electrode, the connecting signal line and the common electrode unit are respectively connected with different pins of the driving chip; one of the common electrode unit and the third conductive electrode serves as a touch sensing electrode, the other one serves as a touch driving electrode, the orthographic projection of the common electrode unit on the substrate and the orthographic projection of the third conductive electrode on the substrate have an overlapping area, and the overlapping area serves as a touch detection point. When the touch display panel is touched, it can be guaranteed that the display effect is not affected.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a touch display panel, a preparation method and a touch display device. Background Art

[0002] As a substitute for traditional paper books, the electronic paper module can meet the needs of users for reading, meetings, notes, etc., and has gradually become one of the mainstream products in the field. The electronic paper module may include a display drive system and a touch drive system, which operate independently to enable it to have display and touch functions. When the electronic paper module displays the screen, the user can touch the electronic paper module to make the electronic paper module perform functions switching, book page turning, note writing and other actions. However, when the electronic paper module is displaying and touching at the same time, mutual interference is likely to occur, resulting in display abnormalities. Summary of the invention

[0003] The purpose of the present application is to provide a touch display panel, a preparation method and a touch display device, which can ensure that the display effect of the touch display panel is not affected when the touch display panel is touched.

[0004] In a first aspect, the present application provides a touch display panel, comprising a base substrate, a driving circuit layer and an electronic paper film arranged on the base substrate, wherein the driving circuit layer is arranged on a side of the electronic paper film close to the base substrate; the driving circuit layer comprises a common electrode unit, a pixel electrode block and a connecting signal line, the common electrode unit is arranged on a side of the pixel electrode block away from the base substrate, and an insulating layer is formed between the common electrode unit and the pixel electrode block; the extending direction of the connecting signal line intersects with the extending direction of the common electrode unit;

[0005] The electronic paper film comprises a plurality of electrophoretic units arranged in an array in a row direction and a column direction, wherein the electrophoretic unit comprises a microcapsule structure, a first conductive electrode, a second conductive electrode and a third conductive electrode, wherein the first conductive electrode and the second conductive electrode are arranged on opposite sides of the microcapsule structure, and the first conductive electrode is connected to the pixel electrode block; the third conductive electrode is arranged on the same side of the first conductive electrode and the second conductive electrode, and is spaced apart from the first conductive electrode and the second conductive electrode, and the orthographic projection of the third conductive electrode on the base substrate is located within the orthographic projection of the connection signal line on the base substrate, and the third conductive electrode is connected to the connection signal line;

[0006] Among them, the second conductive electrode, the connecting signal line and the common electrode unit are respectively connected to different pins of the driving chip, and the third conductive electrodes in the electrophoresis units in adjacent rows are connected to each other; one of the common electrode unit and the third conductive electrode is used as a touch sensing electrode, and the other is used as a touch driving electrode, and the orthographic projection of the common electrode unit on the base substrate and the orthographic projection of the third conductive electrode on the base substrate have an overlapping area, and the overlapping area is used as a touch detection point.

[0007] In an exemplary embodiment of the present application, the connecting signal line and the pixel electrode block are arranged in the same layer and are spaced apart from each other.

[0008] In an exemplary embodiment of the present application, the driving circuit layer further includes a transistor, the transistor includes a gate, an active layer, and a first electrode and a second electrode in the same layer and arranged at intervals, a gate insulating layer is provided between the gate and the active layer, the gate insulating layer covers the gate, the active layer is provided on a side of the gate insulating layer away from the base substrate, and the orthographic projection of the active layer on the base substrate and the orthographic projection of the gate on the base substrate at least partially overlap, the first electrode and the second electrode are respectively overlapped at opposite ends of the active layer, a flat layer is provided between the pixel electrode and the first electrode and the second electrode, the flat layer covers the first electrode, the active layer and the second electrode, the pixel electrode is provided on a side of the flat layer away from the base substrate, and the pixel electrode is connected to the first electrode through a first via structure;

[0009] The common electrode unit is arranged in the same layer as the first electrode and the second electrode, and is spaced from each other.

[0010] In an exemplary embodiment of the present application, the driving circuit layer includes:

[0011] A plurality of groups of common electrode units, wherein the plurality of groups of common electrode units are arranged at intervals in the column direction and the common electrode units extend in the row direction; each group of the common electrode units comprises a plurality of common electrode blocks arranged at intervals in the row direction, adjacent common electrode blocks are connected by connecting lines, the orthographic projections of the common electrode blocks on the base substrate and the orthographic projections of the pixel electrode blocks on the base substrate have the overlapping areas, and the orthographic projections of the connecting lines on the base substrate and the orthographic projections of the third conductive electrodes on the base substrate have the overlapping areas;

[0012] A plurality of connection signal lines are provided, the plurality of connection signal lines are arranged at intervals in the row direction, and the connection signal lines extend in the column direction.

[0013] In an exemplary embodiment of the present application, the electrophoresis unit further includes a fourth conductive electrode, which is arranged opposite to the third conductive electrode, the fourth conductive electrode is located on the same side of the first conductive electrode and the second conductive electrode, and is spaced apart from the first conductive electrode and the second conductive electrode, and the fourth conductive electrode and the third conductive electrode are respectively connected to two adjacent connection signal lines.

[0014] In an exemplary embodiment of the present application, the driving circuit layer further includes:

[0015] The first electrode is in the same layer as the gate and is arranged at an interval. A second via structure is provided on the gate insulating layer, and the second via structure exposes a portion of the first electrode. The first electrode is connected to the first electrode through the second via structure, and the orthographic projection of the first electrode on the base substrate and the orthographic projection of the common electrode on the base substrate have at least a partial overlapping area.

[0016] A second aspect of the present application provides a method for preparing a touch display panel as described in any one of the above items, the method comprising:

[0017] providing a substrate base plate;

[0018] A driving circuit layer is formed on the base substrate, the driving circuit layer comprising a common electrode unit, a pixel electrode block and a connecting signal line, the common electrode unit is arranged on a side of the pixel electrode block away from the base substrate, and an insulating layer is formed between the common electrode unit and the pixel electrode block; the extending direction of the connecting signal line intersects with the extending direction of the common electrode unit;

[0019] An electronic paper film is formed on a side of the driving circuit layer away from the base substrate, the electronic paper film comprising a plurality of electrophoretic units arranged in an array in a row direction and a column direction, the electrophoretic unit comprising a microcapsule structure, a first conductive electrode, a second conductive electrode and a third conductive electrode, the first conductive electrode and the second conductive electrode are arranged on opposite sides of the microcapsule structure, the first conductive electrode is connected to the pixel electrode block; the third conductive electrode is arranged on the same side of the first conductive electrode and the second conductive electrode, and is spaced apart from the first conductive electrode and the second conductive electrode, the orthographic projection of the third conductive electrode on the base substrate is located within the orthographic projection of the connecting signal line on the base substrate, and the third conductive electrode is connected to the connecting signal line; the second conductive electrode, the connecting signal line and the common electrode unit are respectively connected to different pins of the driving chip, and the third conductive electrodes in the electrophoretic units of adjacent rows are connected to each other; one of the common electrode unit and the third conductive electrode is used as a touch sensing electrode, and the other is used as a touch driving electrode, and the orthographic projection of the common electrode unit on the base substrate and the orthographic projection of the third conductive electrode on the base substrate have an overlapping area, and the overlapping area is used as a touch detection point.

[0020] In another exemplary embodiment of the present application, a preparation method for forming the driving circuit layer on the base substrate includes:

[0021] Forming a first metal layer on the base substrate, and patterning the first metal layer to form a gate;

[0022] Forming a gate insulating layer and an active layer in sequence on the base substrate, wherein the gate insulating layer covers the gate;

[0023] forming a second metal layer on the gate insulating layer, and patterning the second metal layer to form a first electrode, a second electrode and a common electrode unit;

[0024] forming a flat layer on the gate insulating layer, the flat layer covering the first electrode, the active layer, the second electrode and the common electrode, and providing a first via structure in a portion corresponding to the first electrode, the first via structure exposing a portion of the first electrode;

[0025] A transparent layer is formed on the flat layer, and the transparent layer is patterned to form pixel electrode blocks and connecting signal lines that are spaced apart from each other, wherein the pixel electrode blocks are connected to the first electrode through the first via structure.

[0026] In another exemplary embodiment of the present application, before forming the active layer on the base substrate, the preparation method further includes:

[0027] Forming a first metal layer on the base substrate, and patterning the first metal layer to form a gate and a first electrode;

[0028] A gate insulating layer is formed on the base substrate, the gate insulating layer covers the gate and the first electrode, and a second via structure is opened in a portion corresponding to the first electrode, the second via structure exposes a portion of the first electrode, and the first electrode is connected to the first electrode through the second via structure.

[0029] A third aspect of the present application provides a touch display device, comprising:

[0030] Driver chip; and

[0031] In the touch display panel described in any of the above items, the driving chip is connected to the second conductive electrode, the connecting signal line and the common electrode unit in the touch display panel, and the second conductive electrode, the connecting signal line and the common electrode unit are connected to different pins of the driving chip.

[0032] The touch display panel, preparation method and touch display device of the present application have at least the following beneficial effects:

[0033] The touch display panel in the present application includes a base substrate, a driving circuit layer and an electronic paper film, wherein the driving circuit layer includes a common electrode unit, a pixel electrode block and a connection signal line, wherein a plurality of common electrode units are arranged at intervals in the column direction, the common electrode unit extends in the row direction, the connection signal line extends in the column direction, and a plurality of connection signal lines are arranged at intervals in the row direction; the electronic paper film includes a microcapsule structure, a first conductive electrode, a second conductive electrode and a third conductive electrode, wherein the first conductive electrode and the second conductive electrode are respectively arranged on opposite sides of the microcapsule structure, wherein the first conductive electrode is connected to the pixel electrode block, the first conductive electrode and the second conductive electrode are used to drive the particles in the microcapsule structure to move, the third conductive electrode is arranged on one side of the first conductive electrode and the second conductive electrode, and is connected to the connection signal line, wherein one of the common electrode unit and the third conductive electrode is used as a touch sensing electrode, and the other is used as a touch driving electrode, the common electrode block and the third conductive electrode have an overlapping area, and the overlapping area can be used as a touch detection point, thereby realizing the touch function. The second conductive electrode, the connecting signal line and the common electrode unit are respectively connected to different pins of the driving chip, that is, the separate driving pin of the driving chip drives the second conductive electrode. When the touch display panel is touched, the signal fluctuation will not change the voltage of the first conductive electrode and the second conductive electrode, will not affect the particles in the microcapsule structure, and will not affect the display, thereby ensuring the coexistence of display and touch.

[0034] In addition, the second conductive electrode is disposed on the driving circuit layer as one of the touch sensing electrode and the touch driving electrode, thereby avoiding the shielding effect of the common electrode unit and improving the touch accuracy.

[0035] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of a structure in which a driving circuit layer and an electronic paper film are provided on a substrate provided in Embodiments 1 to 3 of the present application is shown;

[0039] Figure 2 It shows a schematic structural diagram of an electrophoresis unit provided in Embodiments 1 to 3 of the present application, which is arranged on a driving circuit layer;

[0040] Figure 3 It shows a schematic structural diagram of the connection of adjacent rows of electrophoresis units provided in Embodiments 1 to 3 of the present application;

[0041] Figure 4 It shows a schematic diagram of a structure in which the third conductive electrode and the common electrode provided in the first to third embodiments of the present application are multiplexed into a touch driving electrode and a touch sensing electrode;

[0042] Figure 5 The schematic diagram of the structure of the electrophoresis unit provided in Embodiments 1 to 3 of the present application is shown;

[0043] Figure 6 The schematic diagram of the top view of the electrophoresis unit provided in Embodiments 1 to 3 of the present application is shown;

[0044] Figure 7 A schematic flow chart of a method for preparing a touch display panel provided in Embodiment 2 or Embodiment 3 of the present application is shown;

[0045] Figure 8 A schematic flow chart of a method for preparing a driving circuit layer provided in Embodiment 2 or Embodiment 3 of the present application is shown;

[0046] Fig. 9 A schematic flow chart of a method for preparing a first electrode provided in Embodiment 2 or Embodiment 3 of the present application is shown;

[0047] Fig.10 A schematic diagram showing the steps of preparing a touch display panel provided in Embodiment 2 or Embodiment 3 of the present application is shown;

[0048] Fig.11 A schematic diagram of the structure of the connection between the driving chip and the touch display panel provided in Embodiments 1 to 3 of the present application is shown.

[0049] Description of reference numerals:

[0050] 10. Touch display device; 100. Touch display panel; 110. Base substrate; 120. Driving circuit layer; 121. Common electrode unit; 1210. Common electrode block; 1211. Connecting line; 122. Pixel electrode block; 123. Connecting signal line; 124. Transistor; 1240. Gate; 1241. Active layer; 1242. First electrode; 1243. Second electrode; 1244. Gate insulating layer; 1245. Flat layer; 1 25. First electrode; 130. Electronic paper film; 131. Electrophoretic unit; 1310. Microcapsule structure; 13100. Electrophoretic particles; 1311. First conductive electrode; 1312. Second conductive electrode; 1313. Third conductive electrode; 1314. Fourth conductive electrode; 200. Driver chip; Cst1. First storage capacitor; Cst2. Second storage capacitor; M1. First via structure; M2. Second via structure; A. Overlapping area. DETAILED DESCRIPTION

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0052] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0055] Embodiment 1

[0056] See also Figure 1 As shown, the first embodiment of the present application provides a touch display panel 100, which includes a base substrate 110 and a driving circuit layer 120 and an electronic paper film 130 arranged on the base substrate 110, and the electronic paper film 130 is attached to the side of the driving circuit layer 120 away from the base substrate 110.

[0057] This base substrate 110 can be a rigid substrate made of glass, but is not limited to this. It can also be a flexible substrate made of materials such as polyimide (abbreviated as Polyimide, abbreviated as PI). In other words, the touch display panel 100 of the present application is not limited to a rigid, non-bendable panel, but can also be a flexible, bendable panel.

[0058] The driving circuit layer 120 is disposed between the electronic paper film 130 and the base substrate 110 . The driving circuit layer 120 includes a common electrode unit 121 , a pixel electrode block 122 and a connecting signal line 123 .

[0059] The common electrode unit 121 is disposed on a side of the pixel electrode block 122 away from the base substrate 110 , and an insulating layer is formed between the common electrode unit 121 and the pixel electrode block 122 . The extension direction of the common electrode unit 121 intersects with the extension direction of the connection signal line 123 .

[0060] See also Figure 1As shown, the pixel electrode block 122 is disposed on a side of the common electrode unit 121 away from the base substrate 110, and the pixel electrode block 122 can be connected to the first electrode 1242 of the transistor 124 described below, so that the data signal of the data line can be transmitted to the pixel electrode block 122. The pixel electrode block 122 can be a transparent electrode, for example, it can be made of ITO (indium tin oxide) material to improve light transmittance, but is not limited thereto, and can also be made of other transparent conductive materials.

[0061] See also Figure 2 As shown, the electronic paper film 130 includes a plurality of electrophoretic units 131 arranged in an array in the row direction and the column direction. Each electrophoretic unit 131 includes a microcapsule structure 1310 , a first conductive electrode 1311 , a second conductive electrode 1312 and a third conductive electrode 1313 .

[0062] See also Figure 2 As shown, the first conductive electrode 1311 and the second conductive electrode 1312 are respectively disposed on opposite sides of the microcapsule structure 1310. The first conductive electrode 1311 is electrically connected to the pixel electrode block 122 when the electronic paper film 130 is attached to the driving circuit layer 120, that is, the first conductive electrode 1311 is disposed on the lower side of the microcapsule structure 1310. Correspondingly, the second conductive electrode 1312 is disposed on the upper side of the microcapsule structure 1310, and the first conductive electrode 1311 and the second conductive electrode 1312 are used to drive the movement of the electrophoretic particles 13100 in the microcapsule structure 1310.

[0063] It can be understood that, since the first conductive electrode 1311 is electrically connected to the pixel electrode block 122 , the voltage signal of the first conductive electrode 1311 is the same as the voltage signal of the pixel electrode block 122 .

[0064] See also Figure 2 and Figure 3 As shown, the third conductive electrode 1313 is arranged on the same side of the first conductive electrode 1311 and the second conductive electrode 1312, that is, the third conductive electrode 1313 is arranged on the left or right side of the microcapsule structure 1310, and is spaced from the first conductive electrode 1311 and the second conductive electrode 1312 to avoid interference with each other and ensure the display effect; the orthographic projection of the third conductive electrode 1313 on the base substrate 110 is located within the orthographic projection of the connection signal line 123 on the base substrate 110, and is connected to the connection signal line 123, and the extension direction of the third conductive electrode 1313 is the same as the extension direction of the connection signal line 123.

[0065] It should be noted that see Figure 3 and Figure 4As shown, the electrophoresis units 131 in adjacent rows can be connected to each other, that is, the first conductive electrodes 1311 in the adjacent row direction can be connected to each other, and the first conductive electrodes 1311 are extended in the column direction. Correspondingly, the third conductive electrodes 1313 in the adjacent column direction can also be connected to each other, and the third conductive electrodes 1313 are also extended in the column direction.

[0066] Among them, the second conductive electrode 1312, the connecting signal line 123 and the common electrode unit 121 can be connected to different driving pins of the driving chip 200 respectively. Since the voltage of the first conductive electrode 1311 and the voltage of the second conductive electrode 1312 are used to control the movement of the electrophoretic particles 13100 in the microcapsule structure 1310, when the second conductive electrode 1312 is connected to a driving pin different from the connecting signal line 123 and the common electrode unit 121, the second conductive electrode 1312 is driven by a separate driving pin. When the touch display panel 100 is touched, the signal fluctuation will not change the voltage on the first conductive electrode 1311 and the second conductive electrode 1312, and will not affect the movement of the electrophoretic particles 13100, and will not affect the display.

[0067] For touch control, see Figure 4 As shown, one of the common electrode unit 121 and the third conductive electrode 1313 is used as a touch sensing electrode (RX), and the other is used as a touch driving electrode (TX). The orthographic projection of the common electrode unit 121 on the base substrate 110 and the orthographic projection of the third conductive electrode 1313 on the base substrate 110 have an overlapping area A, and the overlapping area A is used as a touch detection point.

[0068] It can be understood that by multiplexing the common electrode unit 121 in the driving circuit layer 120 as a touch sensing electrode (RX) or a touch driving electrode (TX), and multiplexing the third conductive electrode 1313 as a touch driving electrode (TX) or a touch sensing electrode (RX), the design film layers of the touch driving electrode (TX) and the touch sensing electrode (RX) can be reduced, and the thickness of the touch display panel 100 can be reduced.

[0069] In addition, when the touch sensing electrodes (RX) or the touch driving electrodes (TX) are disposed on the electronic paper film 130 layer, the shielding effect of the common electrode unit 121 on the touch sensing electrodes (RX) or the touch driving electrodes (TX) can be avoided, thereby improving the touch accuracy of the touch display panel 100.

[0070] In the examples of this application, see Figure 1 As shown, the connection signal line 123 and the pixel electrode block 122 are arranged in the same layer and are spaced apart from each other to avoid mutual interference between the connection signal line 123 and the pixel electrode block 122 .

[0071] It should be noted that "same-layer arrangement" refers to the use of the same film-forming process to form a film layer for forming a specific pattern, and then using the same mask to form a layer structure through a single patterning process. That is, one patterning process corresponds to a mask (also called a photomask). Depending on the specific pattern, a single patterning process may include multiple exposure, development or etching processes, and the specific pattern in the formed layer structure may be continuous or discontinuous, and these specific patterns may also be at different heights or have different thicknesses. This simplifies the manufacturing process, saves manufacturing costs, and improves production efficiency.

[0072] That is, the connecting signal line 123 and the pixel electrode block 122 are manufactured through the same process and are made of the same material.

[0073] It is understandable that the connection signal line 123 can also be made of a different material from the pixel electrode block 122. The connection signal line 123 and the pixel electrode block 122 are arranged on the same layer, which reduces the number of design layers of the connection signal line 123, thereby reducing the number of layers of the touch display panel 100, which is conducive to reducing the thickness of the touch display panel 100 and is more conducive to a thin and light design.

[0074] In the examples of this application, see Figure 1 or Figure 2 As shown, this driving circuit layer 120 also includes a transistor 124, and the transistor 124 may include a gate 1240, an active layer 1241, and a first electrode 1242 and a second electrode 1243 arranged in the same layer. A gate insulating layer 1244 may be arranged between the gate 1240 and the active layer 1241 to insulate the gate 1240 and the active layer 1241 from each other; and the first electrode 1242 and the second electrode 1243 may be respectively connected to the source and drain doping regions of the active layer 1241. Specifically, the corresponding connection relationship between the first electrode 1242 and the second electrode 1243 and the source and drain doping regions of the active layer 1241 can be determined according to whether the transistor 124 is N-type or P-type, which will not be described in detail here.

[0075] For example, the transistor 124 of the embodiment of the present application may be a bottom gate type, that is, the gate 1240 may be first formed on the base substrate 110; then, a gate insulating layer 1244 is formed on the base substrate 110, and the gate insulating layer 1244 covers the gate 1240; then, an active layer 1241 is formed on the side of the gate insulating layer 1244 away from the base substrate 110, that is, the active layer 1241 is located on the side of the gate 1240 away from the base substrate 110, and the active layer 1241 and the gate 1240 are on the base substrate 110. There is overlap in the orthographic projections on the substrate 110. For example, the orthographic projection of the active layer 1241 on the base substrate 110 may be located within the orthographic projection of the gate 1240 on the base substrate 110; the first pole 1242 and the second pole 1243 may be formed after the active layer 1241 is formed, and at least a portion of the first pole 1242 may overlap on a doped region of the source and drain doped regions of the active layer 1241; at least a portion of the second pole 1243 may overlap on another doped region of the source and drain doped regions of the active layer 1241.

[0076] It should be noted that the transistor 124 in the embodiment of the present application is not limited to the bottom gate type mentioned above, but can also be a top gate type.

[0077] In addition, the gate 1240 can be made of metal or alloy materials, such as molybdenum, aluminum and titanium, to ensure good electrical conductivity, but not limited thereto, and can also be made of other materials with good electrical conductivity. The first pole 1242 and the second pole 1243 can also be made of metal or alloy materials, such as molybdenum, aluminum and titanium, to ensure good electrical conductivity, but not limited thereto, and can also be made of other materials with good electrical conductivity.

[0078] The pixel electrode block 122 may be formed after the first electrode 1242 and the second electrode 1243 of the transistor 124 are formed, and a planar layer 1245 may be provided between the pixel electrode block 122 and the metal layer where the first electrode 1242 and the second electrode 1243 of the transistor 124 are located, and the pixel electrode block 122 may be connected to the first electrode 1242 of the transistor 124 through a first via structure M1 penetrating the planar layer 1245. When the transistor 124 is turned on in response to a scan signal provided by the gate 1240, a data signal will flow into the first electrode 1242 of the transistor 124 through the second electrode 1243, thereby writing the data signal into the pixel electrode block 122.

[0079] See also Figure 1 or Figure 2As shown, in order to reduce the number of extra layers occupied by the common electrode unit 121, the common electrode unit 121 is arranged on the same layer as the first pole 1242 and the second pole 1243. That is to say, the common electrode unit 121 and the first pole 1242 and the second pole 1243 can be formed by the same film forming process, and then formed by a single composition process using the same mask. This design can simplify the manufacturing process, save manufacturing costs, and improve production efficiency. In addition, compared with the solution of designing them on different layers, the common electrode unit 121 and the first pole 1242 and the second pole 1243 are arranged on the same layer, which can also reduce the overall thickness of the touch display panel 100, which is conducive to realizing a thin and light display product.

[0080] In addition, in order to avoid crosstalk between the common electrode unit 121 and the first electrode 1242 and the second electrode 1243 , the common electrode unit 121 is spaced apart from the first electrode 1242 and the second electrode 1243 .

[0081] In the examples of this application, see Figure 4 As shown, the common electrode unit 121 is multiplexed as a touch sensing electrode (RX), and the third conductive electrode 1313 is multiplexed as a touch driving electrode (TX). Multiplexing the third conductive electrode 1313 as a touch driving electrode (TX) can reduce the thickness of the entire touch display panel 100, and because the third conductive electrode 1313 is located on the driving circuit layer 120, the shielding effect of the common electrode unit 121 on it is avoided, thereby improving the touch accuracy.

[0082] For touch control, see Figure 4 As shown, the driving circuit layer 120 includes a plurality of common electrode units 121 and a plurality of connecting signal lines 123. The extending direction of the common electrode units 121 intersects with the extending direction of the connecting signal lines 123, and may intersect perpendicularly or at an acute angle.

[0083] In the examples of this application, see Figure 4 As shown, the extension direction of the common electrode unit 121 is perpendicular to the extension direction of the connection signal line 123 .

[0084] Among them, see Figure 4 As shown, the driving circuit layer 120 includes a plurality of groups of common electrode units 121, which are arranged at intervals in the column direction, and each group of common electrode units 121 is extended in the row direction. The common electrode units 121 and the pixel electrode blocks 122 are arranged in sequence in the thickness direction of the base substrate 110, and an insulating layer is formed between the common electrode units 121 and the pixel electrode blocks 122, and the insulating layer is the flat layer 1245 mentioned above.

[0085] See also Figure 4As shown, each group of common electrode units 121 includes a plurality of common electrode blocks 1210 arranged at intervals in the row direction, and adjacent common electrode blocks 1210 are connected by connecting lines 1211 for signal transmission. The orthographic projection of the common electrode block 1210 on the base substrate 110 and the orthographic projection of the pixel electrode block 122 on the base substrate 110 have an overlapping area, and the common electrode block 1210 and the pixel electrode block 122 form a first storage capacitor Cst1.

[0086] The orthographic projection of the connection line 1211 on the base substrate 110 and the orthographic projection of the third conductive electrode 1313 on the base substrate 110 have an overlapping area A, and the overlapping area A is a touch detection point, thereby realizing the touch function.

[0087] See also Figure 1 or Figure 4 As shown, the driving circuit layer 120 also includes a plurality of connecting signal lines 123 , which are spaced apart in the row direction, and each connecting signal line 123 extends in the column direction and is arranged on one side of the pixel electrode block 122 , that is, the pixel electrode block 122 is located between adjacent connecting signal lines 123 .

[0088] In the embodiment of the present application, each group of common electrode units 121 is connected to the corresponding first driving pin, each connecting signal line 123 is connected to the corresponding second driving pin, and the second conductive electrode 1312 is connected to the corresponding third driving pin. By connecting the three to different pins respectively, it can be achieved that the signal fluctuations generated during touch will not affect the display effect.

[0089] It is worth mentioning that the second conductive electrode 1312 is usually input with a common signal.

[0090] In the examples of this application, see Figure 5 and Figure 6 As shown, the electrophoresis unit 131 further includes a fourth conductive electrode 1314, which is arranged opposite to the third conductive electrode 1313, that is, the fourth conductive electrode 1314 is located on the other side of the first conductive electrode 1311 and the second conductive electrode 1312, and the fourth conductive electrode 1314 is spaced from the first conductive electrode 1311 and the second conductive electrode 1312. That is, the fourth conductive electrode 1314 is located on the right side or the left side of the microcapsule structure 1310. The fourth conductive electrodes 1314 of the electrophoresis units 131 in adjacent rows are connected, and the fourth conductive electrode 1314 and the third conductive electrode 1313 are respectively connected to the adjacent connection signal lines 123 on both sides of the pixel electrode block 122, so as to increase the number of touch driving electrodes and improve the touch accuracy.

[0091] It can be understood that the third conductive electrode 1313 and the fourth conductive electrode 1314 can also be located at the front and rear sides of the microcapsule structure 1310, that is, the third conductive electrode 1313 and the fourth conductive electrode 1314 are extended in the row direction, and the extension directions of the connecting signal line 123 and the common electrode unit 121 are mutually converted, that is, the connecting signal line 123 is extended in the row direction, and the common electrode unit 121 is extended in the column direction.

[0092] In addition, the third conductive electrodes 1313 and the fourth conductive electrodes 1314 may also be arranged in other directions, which may be specifically designed according to different embodiments, as long as the third conductive electrodes 1313 and the fourth conductive electrodes 1314 are reused as touch driving electrodes (TX).

[0093] It is worth mentioning that see Figure 1 or Figure 2 As shown, the orthographic projections of the fourth conductive electrode 1314 and the connecting signal line 123 connected to the fourth conductive electrode 1314 on the base substrate 110 do not overlap with the orthographic projections of the active layer 1241 on the base substrate 110, so as to avoid the fourth conductive electrode 1314 and the connecting signal line 123 from electrically affecting the channel region of the transistor 124, thereby ensuring the transmission stability of the signal.

[0094] When the microcapsule structure 1310 is disposed between the first conductive electrode 1311 , the second conductive electrode 1312 , the third conductive electrode 1313 and the fourth conductive electrode 1314 , the microcapsule structure 1310 can be prevented from sliding into other pixel regions, thereby ensuring the display effect.

[0095] See also Figure 2 and Figure 5 As shown, in order to ensure the connection between the third conductive electrode 1313 and the fourth conductive electrode 1314 and the connection signal line 123 , the lower edges of the third conductive electrode 1313 and the fourth conductive electrode 1314 are flush with the lower edge of the first conductive electrode 1311 .

[0096] In the examples of this application, see Figure 5 As shown, the microcapsule structure 1310 includes an electrophoretic liquid and at least two electrophoretic particles 13100 of different colors. The electrophoretic particles 13100 can move in the electrophoretic liquid under the voltage of the first conductive electrode 1311 and the second conductive electrode 1312 to present different display images.

[0097] The touch display panel 100 can realize both black and white display and color display. When the touch display panel 100 realizes black and white display, the microcapsule structure 1310 only includes black particles and white particles.

[0098] In the embodiment of the present application, the touch display panel 100 includes a plurality of pixel units arranged in an array in the row direction and the column direction. Each pixel unit includes at least one sub-pixel, and a sub-pixel includes a microcapsule structure 1310 .

[0099] For example, see Figure 5 As shown, this touch display panel 100 can realize color display. Each pixel unit includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and each sub-pixel corresponds to a microcapsule structure 1310. The microcapsule structures 1310 corresponding to the red sub-pixel, the green sub-pixel and the blue sub-pixel each include electrophoretic particles 13100 of three different colors. Among them, the microcapsule structure 1310 corresponding to the red sub-pixel includes red particles, white particles and black particles; the microcapsule structure 1310 corresponding to the green sub-pixel includes green particles, white particles and black particles; the microcapsule structure 1310 corresponding to the blue sub-pixel includes blue particles, white particles and black particles.

[0100] See also Figure 1 or Figure 2 As shown, the driving circuit layer 120 also includes a first electrode 125, and the first electrode 125 is arranged on the same layer as the gate electrode 1240. That is to say, the first electrode 125 and the gate electrode 1240 can be formed by the same film forming process, and then formed by a single composition process using the same mask. Such a design can simplify the manufacturing process, save manufacturing costs, and improve production efficiency. In addition, compared with the solution of designing them on different layers, the first electrode 125 and the gate electrode 1240 are arranged on the same layer, which can also reduce the overall thickness of the touch display panel 100, thereby facilitating the realization of a thin and light display product.

[0101] In order to avoid mutual interference between the first electrode 125 and the gate 1240 , the first electrode 125 and the gate 1240 are spaced apart from each other.

[0102] In the examples of this application, see Figure 1 or Figure 2 As shown, a second via structure M2 is provided on the gate insulating layer 1244, and the second via structure M2 exposes a portion of the first electrode 125. The first electrode 1242 is connected to the first electrode 125 through the second via structure M2, and the first electrode 125 receives a data signal transmitted by the first electrode 1242. The orthographic projection of the first electrode 125 on the base substrate 110 and the orthographic projection of the common electrode unit 121 on the base substrate 110 have at least a partially overlapping area, and the first electrode 125 and the common electrode unit 121 form a second storage capacitor Cst2.

[0103] The second storage capacitor Cst2 formed by the first electrode 125 and the common electrode unit 121 can increase the storage capacitor in the touch display panel 100 , thereby improving the optical quality of the touch display panel 100 .

[0104] The present application scheme reduces the number of design layers of the touch drive electrode (TX) and the touch sensing electrode (RX) by reusing the third conductive electrode 1313 and the fourth conductive electrode 1314 in the electrophoresis unit 131 as the touch drive electrode (TX), and reusing the common electrode unit 121 in the drive circuit layer 120 as the touch sensing electrode (RX), thereby reducing the thickness of the entire touch display panel 100. Designing the touch drive electrode (TX) on the drive circuit layer 120 can avoid the influence of the common electrode block 1210 on the touch drive electrode (TX), thereby improving the touch accuracy. In addition, connecting the second conductive electrode 1312, the connecting signal line 123 and the common electrode unit 121 to different pins of the drive chip 200 can ensure that when touching, the voltage on the second conductive electrode 1312 will not change due to signal fluctuations, thereby ensuring a normal display effect when touching.

[0105] Embodiment 2

[0106] See also Figure 7 and Fig.10 As shown, the third embodiment of the present application provides a method for preparing a touch display panel 100, which mainly includes the following steps:

[0107] Step S100, providing a base substrate 110;

[0108] Step S200, forming a driving circuit layer 120 on the base substrate 110;

[0109] The driving circuit layer 120 includes a common electrode unit 121, a pixel electrode block 122 and a connecting signal line 123. The common electrode unit 121 is arranged on a side of the pixel electrode block 122 away from the base substrate 110, and an insulating layer is formed between the pixel electrode block 122; the extension direction of the connecting signal line 123 intersects with the extension direction of the common electrode unit 121.

[0110] In step S300 , an electronic paper film 130 is formed on a side of the driving circuit layer 120 away from the base substrate 110 .

[0111] The electronic paper film 130 includes a plurality of electrophoretic cells 131 arranged in an array in the row direction and the column direction. Each electrophoretic cell 131 includes a microcapsule structure 1310 , a first conductive electrode 1311 , a second conductive electrode 1312 , and a third conductive electrode 1313 .

[0112] See also Figure 1As shown, the first conductive electrode 1311 and the second conductive electrode 1312 are respectively disposed on opposite sides of the microcapsule structure 1310. The first conductive electrode 1311 is electrically connected to the pixel electrode block 122 when the electronic paper film 130 is attached to the driving circuit layer 120, that is, the first conductive electrode 1311 is disposed on the lower side of the microcapsule structure 1310. Correspondingly, the second conductive electrode 1312 is disposed on the upper side of the microcapsule structure 1310, and the first conductive electrode 1311 and the second conductive electrode 1312 are used to drive the movement of the electrophoretic particles 13100 in the microcapsule structure 1310.

[0113] It can be understood that, since the first conductive electrode 1311 is electrically connected to the pixel electrode block 122 , the voltage signal of the first conductive electrode 1311 is the same as the voltage signal of the pixel electrode block 122 .

[0114] See also Figure 6 As shown, the third conductive electrode 1313 is arranged on the same side of the first conductive electrode 1311 and the second conductive electrode 1312, that is, the third conductive electrode 1313 is arranged on the left or right side of the microcapsule structure 1310, and is spaced from the first conductive electrode 1311 and the second conductive electrode 1312 to avoid interference with each other and ensure the display effect; the orthographic projection of the third conductive electrode 1313 on the base substrate 110 is located within the orthographic projection of the connection signal line 123 on the base substrate 110, and is connected to the connection signal line 123, and the extension direction of the third conductive electrode 1313 is the same as the extension direction of the connection signal line 123.

[0115] It should be noted that the electrophoresis units 131 in adjacent rows may be connected to each other, that is, the first conductive electrodes 1311 in adjacent row directions may be connected to each other, and the first conductive electrodes 1311 are extended in the column direction. Correspondingly, the third conductive electrodes 1313 in adjacent column directions may also be connected to each other, and the third conductive electrodes 1313 are also extended in the column direction.

[0116] Among them, the second conductive electrode 1312, the connecting signal line 123 and the common electrode unit 121 can be connected to different driving pins of the driving chip 200 respectively. Since the voltage of the first conductive electrode 1311 and the voltage of the second conductive electrode 1312 are used to control the movement of the electrophoretic particles 13100 in the microcapsule structure 1310, when the second conductive electrode 1312 is connected to a driving pin different from the connecting signal line 123 and the common electrode unit 121, the second conductive electrode 1312 is driven by a separate driving pin. When the touch display panel 100 is touched, the signal fluctuation will not change the voltage on the first conductive electrode 1311 and the second conductive electrode 1312, and will not affect the movement of the electrophoretic particles 13100, and will not affect the display.

[0117] See also Figure 4As shown, in order to realize touch control, one of the common electrode unit 121 and the third conductive electrode 1313 is used as a touch sensing electrode (RX), and the other is used as a touch driving electrode (TX). In addition, the orthographic projection of the common electrode unit 121 on the base substrate 110 and the orthographic projection of the third conductive electrode 1313 on the base substrate 110 have an overlapping area A, and the overlapping area A is used as a touch detection point.

[0118] It can be understood that by multiplexing the common electrode unit 121 in the driving circuit layer 120 as a touch sensing electrode (RX) or a touch driving electrode (TX), and multiplexing the third conductive electrode 1313 as a touch driving electrode (TX) or a touch sensing electrode (RX), the design film layers of the touch driving electrode (TX) and the touch sensing electrode (RX) can be reduced, and the thickness of the touch display panel 100 can be reduced.

[0119] In addition, when the touch sensing electrodes (RX) or the touch driving electrodes (TX) are disposed on the electronic paper film 130 layer, the shielding effect of the common electrode unit 121 on the touch sensing electrodes (RX) or the touch driving electrodes (TX) can be avoided, thereby improving the touch accuracy of the touch display panel 100.

[0120] It is worth mentioning that the connecting signal line 123 is disposed in the same layer as the pixel electrode block 122 and is spaced apart from each other. The common electrode unit 121 is disposed in the same layer as the first electrode 1242 and the second electrode 1243 and is spaced apart from each other.

[0121] See also Figure 8 and Fig.10 As shown, this preparation method also includes the following steps:

[0122] Step S210, forming a first metal layer on the base substrate 110, and patterning the first metal layer to form a gate 1240;

[0123] Step S220 , forming a gate insulating layer 1244 and an active layer 1241 in sequence on the base substrate 110 , wherein the gate insulating layer 1244 covers the gate 1240 ;

[0124] Step S230, forming a second metal layer on the gate insulating layer 1244, and patterning the second metal layer to form a first electrode 1242, a second electrode 1243 and a common electrode unit 121;

[0125] Step S240, forming a planar layer 1245 on the gate insulating layer 1244, the planar layer 1245 covers the first electrode 1242, the active layer 1241, the second electrode 1243 and the common electrode, and opening a first via structure M1 in a portion corresponding to the first electrode 1242, the first via structure M1 exposing a portion of the first electrode 1242;

[0126] Step S250 , forming a transparent layer on the planar layer 1245 , and patterning the transparent layer to form pixel electrode blocks 122 and connecting signal lines 123 spaced apart from each other, wherein the pixel electrode blocks 122 are connected to the first electrode 1242 through the first via structure M1 .

[0127] It can be understood that by arranging the common electrode unit 121 on the same layer as the first electrode 1242 and the second electrode 1243, and arranging the connecting signal line 123 and the pixel electrode block 122 on the same side, the number of design layers of the connecting signal line 123 and the common electrode unit 121 can be reduced, thereby reducing the number of layers of the touch display panel 100, which is beneficial to reducing the thickness of the touch display panel 100 and is more conducive to a lightweight design.

[0128] In addition, in the examples of this application, see Fig. 9 and Fig.10 As shown, the driving circuit layer 120 further includes a first electrode 125, and the first electrode 125 is disposed in the same layer as the gate electrode 1240, that is, before forming the active layer 1241 on the base substrate 110, the preparation method further includes:

[0129] Step S211, forming a first metal layer on the base substrate 110, and patterning the first metal layer to form a gate 1240 and a first electrode 125;

[0130] In step S212, a gate insulating layer 1244 is formed on the base substrate 110, the gate insulating layer 1244 covers the gate 1240 and the first electrode 125, and a second via structure M2 is opened in a portion corresponding to the first electrode 125, the second via structure M2 exposes a portion of the first electrode 125, and the first electrode 1242 is connected to the first electrode 125 through the second via structure M2.

[0131] The first electrode 125 and the common electrode unit 121 form a second storage capacitor Cst2 , which increases the storage capacitance of the touch display panel 100 and effectively improves the display effect of the touch display panel 100 .

[0132] Embodiment 3

[0133] See also Fig.11As shown, embodiment 3 of the present application provides a touch display device 10, which includes a driver chip 200 and a touch display panel 100 described in any way in embodiment 1. The driver chip 200 is connected to the second conductive electrode 1312, the connecting signal line 123 and the common electrode unit 121 in the touch display panel 100, and the second conductive electrode 1312, the connecting signal line 123 and the common electrode unit 121 are connected to different pins of the driver chip 200, so that touch and display are separated from each other. When the touch display panel 100 is touched, signal fluctuations will not affect the voltage between the first conductive electrode 1311 and the second conductive electrode 1312, and will not affect the movement of the electrophoretic particles 13100 in the microcapsule structure 1310, and will not affect the display.

[0134] According to the embodiment of the present application, the specific type of the touch display device 10 is not particularly limited, and any type of touch display device 10 commonly used in the art can be used, for example, mobile devices such as mobile phones and computers, wearable devices such as watches, VR devices, etc. Those skilled in the art can make corresponding selections according to the specific purpose of the display device, which will not be described in detail here.

[0135] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0136] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. A touch display panel, comprising a base substrate, a driving circuit layer and an electronic paper film arranged on the base substrate, wherein the driving circuit layer is arranged on a side of the electronic paper film close to the base substrate; characterized in that: The driving circuit layer includes a common electrode unit, a pixel electrode block and a connecting signal line. The common electrode unit is arranged on a side of the pixel electrode block away from the base substrate and an insulating layer is formed between the common electrode unit and the pixel electrode block. The extending direction of the connecting signal line intersects with the extending direction of the common electrode unit. The electronic paper film comprises a plurality of electrophoretic units arranged in an array in a row direction and a column direction, wherein the electrophoretic unit comprises a microcapsule structure, a first conductive electrode, a second conductive electrode and a third conductive electrode, wherein the first conductive electrode and the second conductive electrode are arranged on opposite sides of the microcapsule structure, and the first conductive electrode is connected to the pixel electrode block; the third conductive electrode is arranged on the same side of the first conductive electrode and the second conductive electrode, and is spaced apart from the first conductive electrode and the second conductive electrode, and the orthographic projection of the third conductive electrode on the base substrate is located within the orthographic projection of the connection signal line on the base substrate, and the third conductive electrode is connected to the connection signal line; Among them, the second conductive electrode, the connecting signal line and the common electrode unit are respectively connected to different pins of the driving chip, and the third conductive electrodes in the electrophoresis units in adjacent rows are connected to each other; one of the common electrode unit and the third conductive electrode is used as a touch sensing electrode, and the other is used as a touch driving electrode, and the orthographic projection of the common electrode unit on the base substrate and the orthographic projection of the third conductive electrode on the base substrate have an overlapping area, and the overlapping area is used as a touch detection point.

2. The touch display panel according to claim 1, characterized in that: The connecting signal line and the pixel electrode block are arranged in the same layer and are spaced apart from each other.

3. The touch display panel according to claim 1 or 2, characterized in that: The driving circuit layer also includes a transistor, the transistor includes a gate, an active layer, and a first electrode and a second electrode that are in the same layer and are spaced apart, a gate insulating layer is provided between the gate and the active layer, the gate insulating layer covers the gate, the active layer is provided on a side of the gate insulating layer away from the base substrate, and the orthographic projection of the active layer on the base substrate and the orthographic projection of the gate on the base substrate at least partially overlap, the first electrode and the second electrode are respectively overlapped at opposite ends of the active layer, a flat layer is provided between the pixel electrode and the first electrode and the second electrode, the flat layer covers the first electrode, the active layer and the second electrode, the pixel electrode is provided on a side of the flat layer away from the base substrate, and the pixel electrode is connected to the first electrode through a first via structure; The common electrode unit is arranged in the same layer as the first electrode and the second electrode, and is spaced from each other.

4. The touch display panel according to claim 3, characterized in that: The driving circuit layer comprises: A plurality of groups of common electrode units, wherein the plurality of groups of common electrode units are arranged at intervals in the column direction and the common electrode units extend in the row direction; each group of the common electrode units comprises a plurality of common electrode blocks arranged at intervals in the row direction, adjacent common electrode blocks are connected by connecting lines, the orthographic projections of the common electrode blocks on the base substrate and the orthographic projections of the pixel electrode blocks on the base substrate have the overlapping areas, and the orthographic projections of the connecting lines on the base substrate and the orthographic projections of the third conductive electrodes on the base substrate have the overlapping areas; A plurality of connection signal lines are provided, the plurality of connection signal lines are arranged at intervals in the row direction, and the connection signal lines extend in the column direction.

5. The touch display panel according to claim 4, characterized in that: The electrophoresis unit further includes a fourth conductive electrode, which is arranged opposite to the third conductive electrode, is located on the same side of the first conductive electrode and the second conductive electrode, and is spaced apart from the first conductive electrode and the second conductive electrode, and the fourth conductive electrode and the third conductive electrode are respectively connected to two adjacent connection signal lines.

6. The touch display panel according to claim 3, characterized in that: The driving circuit layer also includes: The first electrode is in the same layer as the gate and is arranged at an interval. A second via structure is provided on the gate insulating layer, and the second via structure exposes a portion of the first electrode. The first electrode is connected to the first electrode through the second via structure, and the orthographic projection of the first electrode on the base substrate and the orthographic projection of the common electrode on the base substrate have at least a partial overlapping area.

7. A method for preparing a touch display panel according to any one of claims 1 to 6, characterized in that: The preparation method comprises: providing a substrate base plate; A driving circuit layer is formed on the base substrate, the driving circuit layer comprising a common electrode unit, a pixel electrode block and a connecting signal line, the common electrode unit is arranged on a side of the pixel electrode block away from the base substrate, and an insulating layer is formed between the common electrode unit and the pixel electrode block; the extending direction of the connecting signal line intersects with the extending direction of the common electrode unit; An electronic paper film is formed on a side of the driving circuit layer away from the base substrate, the electronic paper film comprising a plurality of electrophoretic units arranged in an array in a row direction and a column direction, the electrophoretic unit comprising a microcapsule structure, a first conductive electrode, a second conductive electrode and a third conductive electrode, the first conductive electrode and the second conductive electrode are arranged on opposite sides of the microcapsule structure, the first conductive electrode is connected to the pixel electrode block; the third conductive electrode is arranged on the same side of the first conductive electrode and the second conductive electrode, and is spaced apart from the first conductive electrode and the second conductive electrode, the orthographic projection of the third conductive electrode on the base substrate is located within the orthographic projection of the connecting signal line on the base substrate, and the third conductive electrode is connected to the connecting signal line; the second conductive electrode, the connecting signal line and the common electrode unit are respectively connected to different pins of the driving chip, and the third conductive electrodes in the electrophoretic units of adjacent rows are connected to each other; one of the common electrode unit and the third conductive electrode is used as a touch sensing electrode, and the other is used as a touch driving electrode, and the orthographic projection of the common electrode unit on the base substrate and the orthographic projection of the third conductive electrode on the base substrate have an overlapping area, and the overlapping area is used as a touch detection point.

8. The preparation method according to claim 7, characterized in that: The preparation method of forming the driving circuit layer on the base substrate comprises: Forming a first metal layer on the base substrate, and patterning the first metal layer to form a gate; Forming a gate insulating layer and an active layer in sequence on the base substrate, wherein the gate insulating layer covers the gate; forming a second metal layer on the gate insulating layer, and patterning the second metal layer to form a first electrode, a second electrode and a common electrode unit; forming a flat layer on the gate insulating layer, the flat layer covering the first electrode, the active layer, the second electrode and the common electrode, and providing a first via structure in a portion corresponding to the first electrode, the first via structure exposing a portion of the first electrode; A transparent layer is formed on the flat layer, and the transparent layer is patterned to form pixel electrode blocks and connecting signal lines that are spaced apart from each other, wherein the pixel electrode blocks are connected to the first electrode through the first via structure.

9. The preparation method according to claim 8, characterized in that: Before forming the active layer on the base substrate, the preparation method further comprises: Forming a first metal layer on the base substrate, and patterning the first metal layer to form a gate and a first electrode; A gate insulating layer is formed on the base substrate, the gate insulating layer covers the gate and the first electrode, and a second via structure is opened in a portion corresponding to the first electrode, the second via structure exposes a portion of the first electrode, and the first electrode is connected to the first electrode through the second via structure.

10. A touch display device, characterized in that: include: Driver chip; as well as The touch display panel according to any one of claims 1 to 6, wherein the driving chip is connected to the second conductive electrode, the connecting signal line and the common electrode unit in the touch display panel, and the second conductive electrode, the connecting signal line and the common electrode unit are connected to different pins of the driving chip.

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