Touch display module, preparation method thereof and display device

Abstract

The invention discloses a touch display module, a preparation method thereof and a display device, and solves the problem that an OLED (Organic Light Emitting Diode) touch display module in the prior art is relatively large in thickness. The touch display module comprises a substrate; the isolation structure is located on the substrate, and the isolation structure comprises a conductive part; the insulating part is superposed on one side, deviating from the substrate, of the isolation structure; the conducting layer comprises a first electrode and a first touch electrode, the first electrode is surrounded by the isolation structure and makes contact with the conducting part of the isolation structure, and the first touch electrode is stacked on the side, away from the substrate, of at least part of the insulation part; the second touch electrodes are located on the sides, away from the substrate, of the first touch electrodes, the second touch electrodes and the first touch electrodes are arranged in an insulated mode, and the orthographic projection of at least part of the second touch electrodes on the substrate is overlapped with the orthographic projection of the first touch electrodes on the substrate.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a touch display module and a preparation method thereof, and a display device. Background Art

[0002] The organic light-emitting diode (OLED) touch display module in the related art has a large number of film layers, resulting in a large thickness, which is not conducive to the development of lightweight and thin products. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a touch display module and a preparation method thereof, and a display device to solve the problem of high production cost of OLED touch display modules in the prior art.

[0004] In a first aspect, the present application provides a touch display module, comprising: a substrate; an isolation structure located on the substrate, the isolation structure comprising a conductive portion; an insulating portion stacked on a side of the isolation structure facing away from the substrate; a conductive layer comprising a first electrode and a first touch electrode, the first electrode being surrounded by the isolation structure and in contact with the conductive portion of the isolation structure, the first touch electrode being stacked on a side of at least part of the insulating portion facing away from the substrate; and a second touch electrode located on a side of the first touch electrode facing away from the substrate and insulated from the first touch electrode, wherein at least part of the orthographic projection of the second touch electrode on the substrate overlaps with the orthographic projection of the first touch electrode on the substrate.

[0005] In one embodiment, the orthographic projections of the first touch electrode and the second touch electrode on the substrate both have hollowed-out grid patterns, and in the area where the orthographic projections overlap, the grid patterns of the orthographic projection of the first touch electrode and the orthographic projection of the second touch electrode overlap in an offset manner.

[0006] In one embodiment, the orthographic projections of the first touch electrode and the second touch electrode on the substrate both have hollowed-out grid patterns, and the hollowed-out areas of the orthographic projections of the first touch electrode and the second touch electrode on the substrate are different.

[0007] In one embodiment, a redundant touch electrode is further included, which is located in the same film layer as the second touch electrode; the redundant touch electrode is not connected to the touch signal line, and the orthographic projections of the redundant touch electrode and the second touch electrode on the substrate are both hollowed-out grid patterns, and the hollowed-out area of ​​the orthographic projection of the second touch electrode on the substrate is equivalent to the hollowed-out area of ​​the orthographic projection of the redundant touch electrode on the substrate; optionally, the orthographic projection of the second touch electrode on the substrate surrounds the orthographic projection of the redundant touch electrode on the substrate.

[0008] In one embodiment, there are multiple first touch electrodes, the multiple first touch electrodes are arranged at intervals, and the intervals between adjacent first touch electrodes are non-straight lines; and / or there are multiple second touch electrodes, the multiple second touch electrodes are arranged at intervals, and the intervals between adjacent second touch electrodes are non-straight lines.

[0009] In one embodiment, the insulating part includes at least one of an inorganic insulating layer and an organic insulating layer; preferably, the insulating part includes an organic insulating layer, the organic insulating layer includes a redundant light-emitting unit, and the redundant light-emitting unit is arranged on the same layer as the light-emitting unit; further preferably, the isolation structure also includes an inorganic insulating layer, and the conductive part, the inorganic insulating layer, the redundant light-emitting unit and the first touch electrode are stacked in sequence; further preferably, the inorganic insulating layer includes a first surface close to the conductive part and a second surface close to the redundant light-emitting unit, and the orthographic projection of the second surface on the substrate is located within the orthographic projection range of the first surface on the substrate; further preferably, the organic insulating layer also includes an organic insulating sublayer, which is stacked between the conductive part and the inorganic insulating layer; further preferably, the organic insulating sublayer includes a third surface close to the conductive part and a fourth surface close to the inorganic insulating layer, and the orthographic projection of the third surface on the substrate is located within the orthographic projection range of the fourth surface on the substrate.

[0010] In one embodiment, the conductive portion includes a first conductive sublayer and a second conductive sublayer stacked together, the first conductive sublayer is located on a side of the second conductive sublayer close to the substrate, and the orthographic projection of the first conductive sublayer on the substrate is located within the range of the orthographic projection of the second conductive sublayer on the substrate; preferably, the conductive portion also includes a third conductive sublayer, the third conductive sublayer is stacked on a side of the first conductive sublayer close to the substrate, and the orthographic projection of the first conductive sublayer on the substrate is located within the range of the orthographic projection of the third conductive sublayer on the substrate.

[0011] In one embodiment, it also includes a pixel definition layer, which encloses a pixel opening, and at least part of the isolation structure is located between adjacent pixel openings; preferably, the light-emitting device also includes a second electrode, which is located on the side of the first electrode close to the substrate, and the second electrode and the conductive part are arranged in the same layer; preferably, it also includes a thin film encapsulation layer, which is stacked between the first touch electrode and the second touch electrode.

[0012] The second aspect of the present application provides a method for preparing a touch display module, comprising: preparing a conductive layer on a preset substrate; wherein the preset substrate comprises a substrate, an isolation structure is provided on one side surface of the substrate, an insulating portion is provided on a surface of the isolation structure facing away from the substrate, and the isolation structure comprises a conductive portion; the conductive layer comprises a first electrode and a first touch electrode, the first electrode is surrounded by the isolation structure and contacts the conductive portion of the isolation structure, and the first touch electrode is stacked on a side of at least part of the insulating portion facing away from the substrate; preparing an insulating layer on the conductive layer; preparing a second touch electrode on the insulating layer to obtain a touch display module; wherein at least part of the orthographic projection of the second touch electrode on the substrate overlaps with the orthographic projection of the first touch electrode on the substrate.

[0013] A third aspect of the present application provides a display device, comprising the touch display module provided by any of the above embodiments.

[0014] According to the touch display module and its preparation method and display device provided in the embodiments of the present application, the first electrode and the first touch electrode are both located in the same conductive layer. Compared with being respectively arranged in different conductive layers, the number of film layers is reduced, thereby reducing the thickness of the touch display module, which is conducive to the development of lightweight and thin products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an external OLED touch display module in the related art.

[0016] Figure 2 It is a structural schematic diagram of an On-cell OLED touch module in the related art.

[0017] Figure 3 This is a schematic structural diagram of a touch display module provided in the first embodiment of the present application.

[0018] Figure 4 This is a schematic top view of the structure of the first touch electrode provided in the first embodiment of the present application.

[0019] Figure 5 This is a schematic top view of the structure of a second touch electrode provided in the second embodiment of the present application.

[0020] Figure 6 A schematic diagram of the positional relationship between the first touch electrode and the second touch electrode provided in the first embodiment of the present application.

[0021] Figure 7 A schematic structural diagram of a second electrode and a conductive portion provided in one embodiment of the present application.

[0022] Figure 8 This is a schematic diagram of the structure of a touch display module provided in the second embodiment of the present application.

[0023] Fig. 9 This is a schematic diagram of the structure of a touch display module provided in the third embodiment of the present application.

[0024] Fig.10 This is a schematic structural diagram of a touch display module provided in the fourth embodiment of the present application.

[0025] Fig.11 A schematic diagram of the positional relationship between the first touch electrode and the second touch electrode provided in the second embodiment of the present application.

[0026] Fig.12 A schematic diagram of the positional relationship between the first touch electrode and the second touch electrode provided in the third embodiment of the present application.

[0027] Fig.13 This is a schematic top view of the structure of a second touch electrode provided in the second embodiment of the present application.

[0028] Fig.14 This is a schematic top view of the structure of a first touch electrode provided in the second embodiment of the present application.

[0029] Fig.15 A schematic diagram of a process of a touch display module provided in one embodiment of the present application.

[0030] Fig.16 A schematic diagram of the structure of a display device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0031] The OLED touch display modules in the related art include external type and embedded type (On cell).

[0032] Figure 1 FIG. 1 is a schematic diagram of the structure of an external OLED touch display module in the related art. Figure 1 As shown, the touch panel 10 is adhered between the display panel 20 and the polarizer 30 through an adhesive layer. The external touch display module needs to manufacture the touch panel 10 separately and adhere it between the display panel 20 and the polarizer 30, which has a complicated process and high cost.

[0033] Figure 2 FIG. 1 is a schematic diagram of the structure of an On-cell OLED touch module in the related art. Figure 2 As shown, the touch panel 10 is directly manufactured between the light emitting device layer 21 and the thin film encapsulation layer 22 of the display panel 20. The manufacturing process of the on-cell touch panel 10 is complicated, resulting in high cost.

[0034] After careful research, the inventor found that the light-emitting device layer 21 includes a light-emitting device, which is a sandwich structure, including a stacked anode, a light-emitting unit and a cathode. The touch panel 10 is also a sandwich structure, including a stacked first touch electrode, an insulating layer and a second touch electrode. Based on this, the inventor thought of setting a touch electrode of the touch panel 10 and a functional layer of the light-emitting device in the same film layer to reduce the number of film layers, thereby reducing the thickness of the touch module, which is conducive to the development of lightweight products.

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Figure 3 This is a schematic diagram of the structure of the touch display module provided in the first embodiment of the present application. Figure 3 As shown, the touch display module includes: a substrate 11 , an isolation structure 12 , an insulating portion 13 , a conductive layer 14 and a second touch electrode 15 .

[0037] The substrate 11 is used to provide support and can be ultra-thin glass, polyimide film, etc.

[0038] The isolation structure 12 is located on the substrate 11, and the isolation structure 12 encloses an isolation opening, and the sidewall of the isolation structure 12 is concave. The isolation structure 12 includes a conductive portion 12. Exemplarily, the conductive portion 12 includes a stacked first conductive sublayer and a second conductive sublayer, the first conductive sublayer is located on a side of the second conductive sublayer close to the substrate 17, and the orthographic projection of the first conductive sublayer on the substrate 17 is located within the orthographic projection range of the second conductive sublayer on the substrate 17. In this case, a concave structure can be formed on the sidewall of the conductive portion. Accordingly, when a film layer is evaporated on the side of the isolation structure 12 away from the substrate 11, the evaporated film layer can be disconnected at the edge of the second conductive sublayer, thereby omitting the fine metal mask plate.

[0039] The conductive part 12 may further include a third conductive sublayer, which is stacked on a side of the first conductive sublayer close to the substrate 17, and the orthographic projection of the first conductive sublayer on the substrate 17 is located within the orthographic projection range of the third conductive sublayer on the substrate 17. In this case, the third conductive sublayer, the first conductive sublayer, and the second conductive sublayer constitute an isolation structure 12 having an I-shaped cross-section. Exemplarily, the conductive part may adopt a Ti / Al / Ti structure.

[0040] The insulating portion 13 is stacked on a side of the isolation structure 12 facing away from the substrate 11 .

[0041] The conductive layer 14 includes a first electrode 141 and a first touch electrode 142, and the first electrode 141 and the first touch electrode 142 are equivalent to the conductive layer 14 being disconnected at the edge of the isolation structure 12. Among them, the first electrode 141 is located in the isolation opening, surrounded by the isolation structure 12, and contacts the conductive part of the isolation structure 12. In one embodiment, the first electrode 141 can contact the conductive part in the isolation structure 12 in an overlapping manner. The first touch electrode 142 is superimposed on the side of the insulating part 13 away from the substrate 11. It should be noted that the first touch electrode 142 can be set only on the side of the partial insulating part 13 away from the substrate 11.

[0042] The second touch electrode 15 is located on the side of the first touch electrode 142 away from the substrate 11, and is insulated from the first touch electrode 142. For example, the touch display module further includes an encapsulation layer 19, which is located between the conductive layer 14 and the second touch electrode 15 to insulate the conductive layer 14 from the second touch electrode 15. The thin film encapsulation layer may include, for example, a first inorganic layer, an organic layer, and a second inorganic layer stacked in sequence. At least part of the orthographic projection of the second touch electrode 15 on the substrate 11 overlaps with the orthographic projection of the first touch electrode 142 on the substrate 11.

[0043] In the touch display module provided in the embodiment of the present application, the first touch electrode 142 and the first electrode 141 are located in the same film layer, thereby reducing the number of film layers, thereby reducing the thickness of the touch display module, which is conducive to the development of lightweight and thin products.

[0044] In one embodiment, the touch display module further includes a light emitting structure layer, including a plurality of light emitting structures 16, which are stacked on the side of the first electrode 141 facing the substrate 11 and surrounded by the isolation structure 12. The light emitting structure 16 and the insulating portion 13 can be obtained by disconnecting the same film layer at the isolation structure 12, that is, the light emitting structure 16 and the insulating portion 13 are located in the same film layer. In this case, the insulating portion 13 can be regarded as a redundant light emitting structure, that is, a light emitting structure that is not used for emitting light.

[0045] In one embodiment, the touch display module further includes a second electrode layer, including a plurality of second electrodes 17, which are located on the side of the light emitting structure 16 away from the first electrode 141 and surrounded by the isolation structure 12. The second electrode 17, the light emitting structure 16 and the first electrode 141 stacked in sequence constitute a light emitting device. The second electrode 17 can be an anode, in which case the first electrode 141 is a cathode; or the second electrode 17 is a cathode, and the first electrode 141 is an anode.

[0046] like Figure 3As shown, the touch display module may also include: a pixel definition layer 18, which is located on the side of the substrate 11 where the isolation structure 12 is located, that is, the pixel definition layer 18 and the isolation structure 12 are located on the same side of the substrate 11. The pixel definition layer 18 includes a plurality of pixel definition units, and the isolation structure 12 is located between the pixel definition units to separate the pixel definition units. Each pixel definition unit encloses a pixel opening, and the pixel opening exposes the second electrode 17, and the pixel definition unit can isolate the second electrode 17 from the isolation structure 12. In this case, the isolation structure 12 is a mesh structure, and a grid of the isolation structure 12 surrounds a pixel opening. It should be noted that in other embodiments, the isolation structure 12 may also be superimposed on the side of the pixel definition layer 18 away from the substrate 11. In this case, the pixel definition layer 18 and the isolation structure 12 are both mesh structures.

[0047] In one embodiment, Figure 3 As shown, the touch display module may further include: an array layer 110, located between the substrate 11 and the isolation structure 12. The array layer 110 includes a pixel circuit, and the pixel circuit is electrically connected to the light-emitting device to drive the light-emitting device to emit light according to a predetermined brightness. The pixel circuit may be a 7T1C pixel circuit. It should be understood that the pixel circuit may also be integrated into a chip outside the touch display module. In this case, the touch display module does not include the array layer 110.

[0048] Figure 4 FIG. 1 is a schematic diagram of a top view of the first touch electrode provided in the first embodiment of the present application. Figure 4 As shown, the first touch electrode 142 includes a plurality of first touch electrode units 1420, the first touch electrode units 1420 are a mesh structure, the first touch electrode units 1420 extend along the second direction x, and the plurality of first touch electrode units 1420 are arranged along the first direction y, and the first direction y intersects the second direction x. The plurality of first touch electrode units 1420 form a first full-surface mesh structure, and adjacent first touch electrode units 1420 are disconnected at the grid lines to be spaced from each other. That is, the orthographic projection of the first touch electrode 142 on the substrate 11 is a hollowed-out mesh pattern.

[0049] Figure 5 FIG. 1 is a schematic diagram of a top view of the second touch electrode provided in the first embodiment of the present application. Figure 5 As shown, the second touch electrode 15 includes a plurality of second touch electrode units 150, and the second touch electrode units 150 are a mesh structure. The second touch electrode units 150 extend along the first direction y, and the plurality of second touch electrode units 150 are arranged along the second direction x. The plurality of second touch electrode units 150 form a second full-surface mesh structure, and adjacent second touch electrode units 150 are disconnected at the grid lines to be spaced from each other. That is, the orthographic projection of the second touch electrode 15 on the substrate 11 is a hollowed-out mesh pattern.

[0050] Figure 6 Schematic diagram of the positional relationship between the first touch electrode and the second touch electrode provided in the first embodiment of the present application. Figure 6 As shown, the orthographic projection of the second touch electrode 15 on the substrate 11 intersects with the orthographic projection of the first touch electrode 142 on the substrate 11 to form a mutual capacitance touch structure. Specifically, the first touch electrode unit 1420 extends along the second direction x, and a plurality of first touch electrode units 1420 are arranged in parallel along the first direction y. The second touch electrode unit 150 extends along the first direction y, and a plurality of second touch electrode units 150 are arranged in parallel along the second direction x.

[0051] The hollow area of ​​the orthographic projection of the first touch electrode 142 on the substrate 11 is equal to the hollow area of ​​the orthographic projection of the second touch electrode 15 on the substrate 11 , that is, the grid density of the first touch electrode 142 and the second touch electrode 15 is the same, and the grid of the first touch electrode 142 is aligned with the grid of the second touch electrode 16 .

[0052] Figure 7 A schematic diagram of the structure of the second electrode and the conductive part provided in one embodiment of the present application. Figure 7 and Figure 3 As shown, the second electrode 17 and the conductive part of the isolation structure 12 are arranged in the same layer. Specifically, the pixel definition layer 18 includes a plurality of pixel definition units 180, and the pixel definition units 180 are stacked on the second electrode 17. Each pixel definition unit 180 is surrounded to form a pixel opening, and the pixel opening exposes the second electrode 17. The conductive part is located in the interval area between adjacent pixel definition units 180, and the conductive part is a mesh structure. The second electrode 17 is located in the mesh formed by the conductive part 12.

[0053] The second electrode 17 and the conductive part are prepared in the same layer, so that the preparation process of the touch display module does not add additional process due to the conductive part.

[0054] Figure 8 This is a schematic diagram of the structure of the touch display module provided in the second embodiment of the present application. Figure 8 As shown, the touch display module and Figure 3The difference between the touch display module shown is that the touch display module provided in this embodiment also includes an organic insulating layer 21, which is stacked between the conductive part of the isolation structure 12 and the first touch electrode 142, specifically between the conductive part and the light-emitting structure 13, or between the light-emitting structure 13 and the first touch electrode 142. The provision of the organic insulating layer 21 increases the thickness of the insulating medium between the conductive part and the first touch electrode 142, thereby reducing the parasitic capacitance between the two. The organic insulating layer 21 can be a light-emitting functional layer, such as an electron transport layer, a hole transport layer, an electron blocking layer, a hole blocking layer, etc., or the material of the organic insulating layer 21 is the same as that of the pixel definition layer 11.

[0055] Fig. 9 This is a schematic diagram of the structure of the touch display module provided in the third embodiment of the present application. Fig. 9 As shown, the touch display module and Figure 3 The difference between the touch display module shown in the figure is that the touch display module provided in this embodiment further includes an inorganic insulating layer 22, which is stacked between the conductive part of the isolation structure 12 and the first touch electrode 142, specifically between the conductive part and the light emitting structure 13, or between the light emitting structure 13 and the first touch electrode 142. The material of the inorganic insulating layer 22 can be silicon carbide, silicon nitride, etc. The provision of the inorganic insulating layer 22 increases the thickness of the insulating medium between the conductive part and the first touch electrode 142, thereby reducing the parasitic capacitance between the two.

[0056] Figure 8 The touch display module and Fig. 9 In comparison with the touch display module shown, the organic insulating layer 21 is thicker and has a smaller dielectric constant than the inorganic insulating layer 22 , so the parasitic capacitance between the conductive portion and the first touch electrode 142 can be smaller.

[0057] Fig.10 This is a schematic diagram of the structure of the touch display module provided in the fourth embodiment of the present application. Fig.10 As shown, the touch display module and Figure 3 The difference between the touch display module shown is that the touch display module further includes an organic insulating layer 21 and an inorganic insulating layer 22 stacked between the conductive portion and the first touch electrode 142, specifically between the conductive portion and the light emitting structure 13, or between the light emitting structure 13 and the first touch electrode 142. The organic insulating layer 21 is located on the side of the inorganic insulating layer 22 close to the conductive portion. The organic insulating layer 21 and the inorganic insulating layer 22 are provided at the same time, further increasing the thickness of the insulating medium between the conductive portion and the first touch electrode 142, thereby further reducing the parasitic capacitance.

[0058] Fig.11Schematic diagram of the positional relationship between the first touch electrode and the second touch electrode provided in the second embodiment of the present application. Figure 6 The difference of the provided touch display module is that, in this embodiment, the orthographic projections of the first touch electrode 142 and the second touch electrode 15 on the substrate both have a hollow grid pattern, and the grid patterns of the orthographic projection of the first touch electrode 142 on the substrate 17 and the orthographic projection of the adjacent second touch electrode 15 on the substrate 17 are staggered and overlapped.

[0059] Specifically, the plurality of first touch electrode units 1420 in the first touch electrodes 142 form a first full-surface grid pattern, and the plurality of second touch electrode units 150 in the second touch electrodes 15 form a second full-surface grid pattern. The grids of the first full-surface grid pattern and the second full-surface grid pattern are staggered and overlapped.

[0060] Since the larger the overlapping area of ​​the first touch electrode 142 and the second touch electrode 15 is, the larger the effective capacitance is and the lower the sensitivity is, the first touch electrode 142 and the second touch electrode 15 are staggered and overlapped, and the overlapping area of ​​the first touch electrode 142 and the second touch electrode 15 can be reasonably adjusted by setting the staggered distance, so as to achieve a compromise between the effective capacitance and the sensitivity.

[0061] Fig.12 Schematic diagram of the positional relationship between the first touch electrode and the second touch electrode provided in the third embodiment of the present application. Figure 6 The difference of the touch display module provided is that, in this embodiment, the orthographic projections of the first touch electrode 142 and the second touch electrode 15 on the substrate are both hollowed-out mesh patterns, and the hollowed-out areas of the orthographic projections of the first touch electrode 142 on the substrate and the hollowed-out areas of the orthographic projections of the second touch electrode 15 on the substrate are not equal. In other words, the first touch electrode 142 and the second touch electrode 15 are both mesh structures, and the mesh densities of the first touch electrode 142 and the second touch electrode 15 are not equal. For example, Fig.12 As shown, the mesh density of the second touch electrodes 15 is greater than the mesh density of the first touch electrodes 142 .

[0062] The grid density determines the signal amount and the parasitic capacitance. The greater the grid density, the greater the signal amount, but the greater the parasitic capacitance. Since the grid density of the first touch electrode 142 is limited by the spacing between adjacent pixel openings, the grid density of the second touch electrode 15 can be reasonably set so that the grid densities of the first touch electrode 142 and the second touch electrode 15 are different, so as to achieve a compromise between the signal amount and the parasitic capacitance.

[0063] Fig.13FIG. 1 is a schematic diagram of a top view of a second touch electrode provided in the second embodiment of the present application. The touch display module and Figure 5 The difference between the touch display modules provided is that the touch layer provided in this embodiment further includes a redundant touch electrode 151, which is arranged in the same layer as the second touch electrode 15, and the orthographic projections of the redundant touch electrode 151 and the second touch electrode 15 on the substrate are both hollowed-out grid patterns, and the hollowed-out area of ​​the orthographic projection of the second touch electrode 15 on the substrate is equivalent to the hollowed-out area of ​​the orthographic projection of the redundant touch electrode 151 on the substrate. In other words, the redundant touch electrode 151 and the second touch electrode 15 are both mesh structures, and the grids of the second touch electrode 15 and the redundant touch electrode 151 are evenly distributed.

[0064] The redundant touch electrodes 151 are not connected to electrical signals. The second touch electrode unit 150 is a mesh structure, and the meshes of the second touch electrode unit 150 and the redundant touch electrodes 151 form a whole mesh structure, and the meshes of the second touch electrode unit 150 and the redundant touch electrodes 151 are evenly distributed.

[0065] like Fig.13 As shown, the redundant touch electrode 151 can be surrounded by the second touch electrode unit 150, that is, the redundant touch electrode 151 is arranged inside the second touch electrode unit 150. In this case, the area of ​​the second touch electrode 15 can be reduced accordingly, thereby avoiding the second touch electrode 15 and the metal layer below it from forming a large parasitic capacitance.

[0066] The redundant touch electrodes 151 may also be disposed between adjacent second touch electrode units 150. In this case, a uniform grid structure may be formed on the film layer where the second touch electrode units 150 are located, so that the display device emits light more uniformly, thereby ensuring a good display effect.

[0067] It should be understood that this embodiment only takes the example of setting the redundant touch electrode 151 in the film layer where the second touch electrode 15 is located. In a specific implementation, the redundant touch electrode 151 can also be set in the film layer where the first touch electrode 142 is located, that is, in the isolation structure, or the redundant touch electrode 151 can be set in the film layer where the second touch electrode 15 and the first touch electrode 142 are located at the same time.

[0068] Fig.14 FIG. 1 is a schematic diagram of a top view of a first touch control electrode provided in the second embodiment of the present application. The touch control display module and Figure 4 The difference of the provided touch display module is that, in this embodiment, the spacing gaps 143 between adjacent first touch electrodes 142 are non-linear; and / or the spacing gaps between adjacent second touch electrodes 16 are non-linear.

[0069] Specifically, the spacing gaps 143 between adjacent first touch electrode units 1420 are non-straight lines. The spacing gaps 143 may be curves or fold lines, etc. In this case, the first touch electrodes 142 do not form slits, thereby avoiding interference fringes.

[0070] It should be understood that the spacing gaps between adjacent second touch electrode units 150 may also be set to be non-straight lines.

[0071] The embodiment of the present application also provides a method for preparing a touch display module. Fig.15 This is a schematic diagram of a touch display module process provided by an embodiment of the present application. Fig.15 As shown, the method for preparing the touch display module includes:

[0072] Step S151, preparing a conductive layer on a preset substrate.

[0073] See also Figure 3 The pre-mounted substrate includes a substrate 11, an isolation structure 12 is provided on one side surface of the substrate 11, an insulating portion 13 is provided on the surface of the isolation structure 12 facing away from the substrate 11, and the isolation structure 12 includes a conductive portion; the conductive layer 14 includes a first electrode 141 and a first touch electrode 142, the first electrode 141 is surrounded by the isolation structure 12 and contacts with the conductive portion of the isolation structure 12, and the first touch electrode 142 is overlapped on a side of at least part of the insulating portion 13 facing away from the substrate 11.

[0074] Step S152 , preparing an insulating layer on the conductive layer 14 .

[0075] Step S153 , preparing second touch electrodes 15 on the insulating layer to obtain a touch display module; wherein at least a portion of the orthographic projection of the second touch electrodes 15 on the substrate 11 overlaps with the orthographic projection of the first touch electrodes 142 on the substrate 11 .

[0076] According to the method for preparing the touch display module provided in this embodiment, the first touch electrode 142 and the first electrode 141 are located in the same film layer, thereby reducing the number of film layers and thus reducing the thickness of the touch display module, which is conducive to the development of lightweight and thin products.

[0077] The method for preparing the touch display module provided in this embodiment belongs to the same application concept as the touch display module provided in the embodiment of the present application, and the preparation method is used to prepare the touch display module provided in any of the above embodiments. For technical details not fully described in the preparation method embodiment, please refer to the touch display module provided in the embodiment of the present application, and will not be repeated here.

[0078] The embodiment of the present application also provides a display device. Fig.16 This is a schematic diagram of the structure of a display device provided in one embodiment of the present application. Fig.16As shown, the display device 100 includes the touch display module provided by any of the above embodiments.

[0079] The display device is an intelligent display terminal with touch function, such as a mobile phone, computer, television, instrument, wearable device, etc.

[0080] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A touch display module, characterized in that: include: substrate; An isolation structure, located on the substrate, the isolation structure comprising a conductive portion; An insulating portion, stacked on a side of the isolation structure away from the substrate; A conductive layer, comprising a first electrode and a first touch electrode, wherein the first electrode is surrounded by the isolation structure and contacts the conductive portion of the isolation structure, and the first touch electrode is stacked on a side of at least a portion of the insulating portion away from the substrate; as well as The second touch electrode is located on a side of the first touch electrode away from the substrate and is insulated from the first touch electrode. At least a portion of the orthographic projection of the second touch electrode on the substrate overlaps with the orthographic projection of the first touch electrode on the substrate.

2. The touch display module according to claim 1, characterized in that: The orthographic projections of the first touch electrode and the second touch electrode on the substrate both have hollowed-out grid patterns, and in an area where the orthographic projections overlap, the grid patterns of the orthographic projection of the first touch electrode and the orthographic projection of the second touch electrode are staggered and overlapped.

3. The touch display module according to claim 1, characterized in that: The orthographic projections of the first touch electrode and the second touch electrode on the substrate both have hollowed-out grid patterns, and the hollowed-out areas of the orthographic projections of the first touch electrode on the substrate and the second touch electrode on the substrate are different.

4. The touch display module according to claim 1, characterized in that: Also includes a redundant touch electrode, which is located in the same film layer as the second touch electrode; the redundant touch electrode is not connected to the touch signal line, the orthographic projections of the redundant touch electrode and the second touch electrode on the substrate are both hollowed-out grid patterns, and the hollowed-out area of ​​the orthographic projection of the second touch electrode on the substrate is equivalent to the hollowed-out area of ​​the orthographic projection of the redundant touch electrode on the substrate; Optionally, the orthographic projection of the second touch electrode on the substrate surrounds the orthographic projection of the redundant touch electrode on the substrate.

5. The touch display module according to claim 1, characterized in that: There are a plurality of first touch electrodes, the plurality of first touch electrodes are arranged at intervals, and intervals between adjacent first touch electrodes are non-straight lines; and / or There are a plurality of second touch control electrodes, the plurality of second touch control electrodes are arranged at intervals, and the intervals between adjacent second touch control electrodes are non-straight lines.

6. The touch display module according to any one of claims 1 to 5, characterized in that: The insulating portion includes at least one of an inorganic insulating layer and an organic insulating layer; Preferably, the insulating portion includes the organic insulating layer, the organic insulating layer includes a redundant light-emitting unit, and the redundant light-emitting unit is arranged in the same layer as the light-emitting unit; Further preferably, the isolation structure further includes the inorganic insulating layer, and the conductive portion, the inorganic insulating layer, the redundant light-emitting unit and the first touch electrode are stacked in sequence; More preferably, the inorganic insulating layer includes a first surface close to the conductive portion and a second surface close to the redundant light-emitting unit, and the orthographic projection of the second surface on the substrate is located within the orthographic projection range of the first surface on the substrate; More preferably, the organic insulating layer further comprises an organic insulating sublayer stacked between the conductive portion and the inorganic insulating layer; Still further preferably, the organic insulating sublayer comprises a third surface close to the conductive portion and a fourth surface close to the inorganic insulating layer, and the orthographic projection of the third surface on the substrate is within the orthographic projection range of the fourth surface on the substrate.

7. The touch display module according to any one of claims 1 to 5, characterized in that: The conductive portion includes a first conductive sublayer and a second conductive sublayer stacked together, the first conductive sublayer is located on a side of the second conductive sublayer close to the substrate, and an orthographic projection of the first conductive sublayer on the substrate is within a range of an orthographic projection of the second conductive sublayer on the substrate; Preferably, the conductive part further includes a third conductive sublayer, which is stacked on a side of the first conductive sublayer close to the substrate, and the orthographic projection of the first conductive sublayer on the substrate is within the orthographic projection range of the third conductive sublayer on the substrate.

8. The touch display module according to any one of claims 1 to 5, characterized in that: It also includes a pixel definition layer, wherein the pixel definition layer encloses pixel openings, and at least part of the isolation structure is located between adjacent pixel openings; Preferably, the light emitting device further comprises a second electrode, which is located on a side of the first electrode close to the substrate, and the second electrode and the conductive part are arranged in the same layer; Preferably, the device further comprises a thin film encapsulation layer stacked between the first touch electrode and the second touch electrode.

9. A method for preparing a touch display module, characterized in that: include: A conductive layer is prepared on a pre-fabricated substrate; wherein the pre-fabricated substrate comprises a substrate, an isolation structure is provided on one side surface of the substrate, an insulating portion is provided on a surface of the isolation structure away from the substrate, and the isolation structure comprises a conductive portion; the conductive layer comprises a first electrode and a first touch electrode, the first electrode is surrounded by the isolation structure and contacts the conductive portion of the isolation structure, and the first touch electrode is stacked on at least a part of the insulating portion away from the substrate; preparing an insulating layer on the conductive layer; A second touch electrode is prepared on the insulating layer to obtain the touch display module; wherein at least a portion of the orthographic projection of the second touch electrode on the substrate overlaps with the orthographic projection of the first touch electrode on the substrate.

10. A display device, comprising the touch display module according to any one of claims 1 to 8.

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