Display substrate, preparation method thereof and touch display device

Abstract

The invention relates to a display substrate, a preparation method thereof and a touch display device. The display substrate comprises a substrate, a display function layer and a touch function layer, wherein the display function layer and the touch function layer are located on the substrate. The display substrate is provided with a first display area and a second display area, and the light transmittance of the first display area is larger than that of the second display area. The touch function layer comprises a first touch electrode, a second touch electrode and at least one bridging electrode. The first touch electrode is located in the first display area and located on the side, facing the substrate, of the display function layer. The second touch electrode is located in the second display area and located on the side, away from the substrate, of the display function layer. The first touch electrodes are electrically connected with the bridging electrodes located in the second display area, and the light transmittance of the first touch electrodes is larger than that of the second touch electrodes. According to the invention, actual touch control can be realized on the UDC while the light transmittance of the UDC is ensured, so that the touch control performance is effectively improved.

Description

Technical Field

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

[0002] With the development of display technology, full-screen or narrow-frame display devices have gradually become the development trend in the display field with their large screen-to-body ratio and ultra-narrow frame. Full-screen or narrow-frame products usually use under-screen fingerprint or under-screen camera technology (Full display with camera, referred to as FDC), placing sensors such as cameras in the under-screen camera area (Under Display Camera, referred to as UDC) of the display substrate. The under-screen camera area not only has a certain light transmittance, but also has a display function. Summary of the invention

[0003] The embodiments of the present disclosure provide a display substrate and a method for manufacturing the same, and a touch display device, which can realize actual touch control on the UDC while ensuring the UDC transmittance, so as to effectively improve the touch performance.

[0004] In a first aspect, some embodiments of the present disclosure provide a display substrate, comprising: a substrate, and a display function layer and a touch function layer located on the substrate. The display substrate has a first display area and a second display area, and the transmittance of the first display area is greater than the transmittance of the second display area. The touch function layer comprises: a first touch electrode, a second touch electrode and at least one bridging electrode. The first touch electrode is located in the first display area, and the first touch electrode is located on the side of the display function layer facing the substrate. The second touch electrode is located in the second display area, and the second touch electrode is located on the side of the display function layer away from the substrate. The bridging electrode is located in the second display area, and the first touch electrode and the bridging electrode are electrically connected. Wherein, the transmittance of the first touch electrode is greater than the transmittance of the second touch electrode.

[0005] In some embodiments of the present disclosure, the display substrate further includes: an isolation structure. The isolation structure includes a first isolation portion and a second isolation portion; wherein the second isolation portion is located on a side of the first isolation portion away from the substrate, and the orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the second isolation portion on the substrate. The second touch electrode and / or the bridge electrode are at least arranged in the same layer as the isolation structure.

[0006] In some embodiments of the present disclosure, the cross-sectional morphology of the second touch electrode and / or the bridging electrode along a first direction perpendicular to the substrate is the same as the cross-sectional morphology of the isolation structure along the first direction; the first direction is the line width direction of the second touch electrode and / or the bridging electrode.

[0007] In some embodiments of the present disclosure, the material of the first isolation portion includes at least one of aluminum, copper or silver.

[0008] In some embodiments of the present disclosure, the material of the second isolation portion includes at least one of titanium or molybdenum.

[0009] In some embodiments of the present disclosure, the material of the second touch electrode and / or the bridge electrode is the same as the material of the isolation structure.

[0010] In some embodiments of the present disclosure, the isolation structure further includes a third isolation portion. The third isolation portion is located on a side of the first isolation portion facing the substrate, and the orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the third isolation portion on the substrate.

[0011] In some embodiments of the present disclosure, the material of the third isolation portion includes at least one of titanium or molybdenum.

[0012] In some embodiments of the present disclosure, the display function layer includes a pixel definition layer. The isolation structure is located on a side of the pixel definition layer away from the substrate.

[0013] In some embodiments of the present disclosure, the first touch electrode and / or the second touch electrode includes a conductive pattern distributed in a grid shape.

[0014] In some embodiments of the present disclosure, the display function layer further includes a pixel definition layer. The pixel definition layer has a plurality of pixel openings. The display function layer further includes: light emitting devices respectively located in each pixel opening. The orthographic projection of the conductive pattern on the substrate is distributed within the orthographic projection of the interval between the corresponding light emitting devices on the substrate.

[0015] In some embodiments of the present disclosure, a plurality of isolation openings are formed by enclosing the isolation structure, and the isolation openings are connected to the pixel openings. The orthographic projections of the conductive patterns on the substrate are at least distributed within the orthographic projections of the spaces between the corresponding isolation structures on the substrate.

[0016] In some embodiments of the present disclosure, the display substrate further comprises: an array layer disposed between the substrate and the display function layer. The array layer comprises a plurality of connecting electrodes. The second touch control electrode is connected to the connecting electrode.

[0017] Preferably, the first touch electrodes are connected to the corresponding connection electrodes in sequence through the bridging electrodes and the second touch electrodes.

[0018] Alternatively, preferably, the first touch electrode is connected to the corresponding connection electrode via a bridging electrode.

[0019] In some embodiments of the present disclosure, the display function layer includes a pixel definition layer. The display substrate also includes a planarization layer covering the array layer; wherein the first touch electrode is located between the planarization layer and the pixel definition layer. Vias are provided on the pixel definition layer and the planarization layer, and the second touch electrode is connected to the corresponding connection electrode through the vias.

[0020] In some embodiments of the present disclosure, the touch function layer includes: a plurality of touch unit areas; the plurality of touch units include at least one first touch unit area located in the first display area, and a plurality of second touch unit areas located in the second display area. The first touch unit area is provided with a first touch electrode; the second touch unit area is provided with a second touch electrode, and at least one of the second touch unit areas is provided with a bridging electrode; the first touch electrode of the first touch unit area is connected to the corresponding bridging electrode, and connected to the corresponding connecting electrode through the bridging electrode.

[0021] In some embodiments of the present disclosure, the touch function layer includes: a plurality of touch unit areas; the plurality of touch unit areas include: a single touch unit area and a mixed touch unit area. The mixed touch unit area is provided with a portion of first touch electrodes and a portion of second touch electrodes, as well as a bridging electrode; the first touch electrode of the mixed touch unit area is connected to the second touch electrode of the mixed touch unit area through the bridging electrode, and is connected to the corresponding connection electrode through the second touch electrode of the mixed touch unit area.

[0022] Preferably, the single touch unit area includes a first touch unit area and a second touch unit area. The first touch unit area is provided with a first touch electrode. The second touch unit area is provided with a second touch electrode. The first touch electrode of the first touch unit area is connected to the bridge electrode of the mixed touch unit area. Alternatively, at least one second touch unit area is further provided with a bridge electrode, and the first touch electrode of the first touch unit area is connected to the bridge electrode of the second touch unit area.

[0023] Preferably, the single touch unit area includes a second touch unit area. The second touch unit area is provided with a second touch electrode. The second touch electrode is connected to the corresponding connection electrode.

[0024] In some embodiments of the present disclosure, the first touch electrode includes a transparent conductive electrode.

[0025] Preferably, the material of the transparent conductive electrode includes: indium tin oxide, indium zinc oxide or indium gallium zinc oxide.

[0026] In some embodiments of the present disclosure, the first display area includes an under-screen camera area.

[0027] In a second aspect, some embodiments of the present disclosure further provide a method for preparing a display substrate, which is used to prepare the display substrate described in some of the above embodiments. The preparation method comprises the following steps.

[0028] A first touch electrode is formed on one side of the substrate, and the first touch electrode is located in the first display area.

[0029] A display function material layer is formed on a side of the substrate away from the first touch electrode.

[0030] At least one bridging electrode and a plurality of second touch electrodes are formed on a side of the display functional material layer away from the substrate; wherein the bridging electrode and the second touch electrodes are located in the second display area; the bridging electrode penetrates the display functional material layer and connects the corresponding first touch electrodes; the transmittance of the first display area is greater than the transmittance of the second display area, and the transmittance of the first touch electrode is greater than the transmittance of the second touch electrode.

[0031] In some embodiments of the present disclosure, the step of forming a display functional material layer on a side of the substrate away from the first touch electrode includes: forming a pixel definition material layer covering the first touch electrode on one side of the substrate, and etching the pixel definition material layer to form a via hole, and a portion of the first touch electrode is exposed through the corresponding via hole.

[0032] Preferably, the step of forming at least one bridging electrode and a plurality of second touch electrodes on a side of the display functional material layer away from the substrate includes: forming an isolation material layer on a side of the etched pixel definition material layer away from the substrate; patterning the isolation material layer to form second touch electrodes and bridging electrodes, and the bridging electrodes are connected to the first touch electrodes through corresponding vias.

[0033] In some embodiments of the present disclosure, the step of forming at least one bridging electrode and a plurality of second touch electrodes on a side of the display functional material layer away from the substrate also includes: forming an isolation structure while patterning the isolation material layer to form the second touch electrodes and the bridging electrodes, the isolation structure enclosing an isolation opening.

[0034] Preferably, the preparation method further comprises: etching the etched pixel definition material layer to form a plurality of pixel openings, wherein the pixel openings are connected to the corresponding isolation openings; and forming light-emitting devices in each pixel opening.

[0035] In some embodiments of the present disclosure, before forming the first touch electrode on one side of the substrate, the preparation method further includes: forming an array layer on the substrate, the array layer including a plurality of connection electrodes; and forming a planarization layer covering the array layer. Accordingly, the first touch electrode is formed on a side of the planarization layer away from the substrate.

[0036] Preferably, the process of etching the pixel definition material layer to form via holes further includes: etching the pixel definition material layer to form via holes, wherein the via holes expose the connection electrodes; and the second touch electrodes are connected to the connection electrodes through the corresponding via holes.

[0037] In a third aspect, some embodiments of the present disclosure further provide a touch display device, comprising: a display substrate as described in any of the above embodiments; or a display substrate prepared by the preparation method as described in any of the above embodiments.

[0038] The embodiments of the present disclosure may have / have at least one of the following advantages:

[0039] In the embodiment of the present disclosure, the transmittance of the first display area is greater than the transmittance of the second display area, the first touch electrode of the touch function layer located in the first display area is arranged between the display function layer and the substrate, the second touch electrode of the touch function layer located in the second display area is arranged on the side of the display function layer away from the substrate, and the first touch electrode can be connected and led out through the bridge electrode located in the second display area, and the transmittance of the first touch electrode is greater than the transmittance of the second touch electrode. In this way, the embodiment of the present disclosure realizes the integration of the touch function in the display substrate, which is not only easy to prepare to improve the production efficiency, but also can realize actual touch in the first display area while ensuring or even improving the transmittance of the first display area (for example, including the under-screen camera area UDC) by arranging the first touch electrode with higher transmittance in the first display area and connecting and leading out the first touch electrode through the bridge electrode located in the second display area, thereby effectively improving the touch performance of the display substrate.

[0040] The details of one or more embodiments of the present disclosure are set forth in the following drawings and description. Other features, objects, and advantages of the present disclosure will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 is a schematic top view of a display substrate provided in some embodiments;

[0043] Figure 2 is a partial cross-sectional view of a display substrate provided in some embodiments;

[0044] Figure 3 is a partial cross-sectional view of a second touch electrode in a display substrate provided in some embodiments;

[0045] Figure 4 A partial cross-sectional view of a bridging electrode in a display substrate provided in some embodiments;

[0046] Figure 5 A partial cross-sectional view of a first touch electrode in a display substrate provided in some embodiments;

[0047] Figure 6A partial cross-sectional view of a second touch electrode in another display substrate provided in some embodiments;

[0048] Figure 7 A partial cross-sectional view of another display substrate provided in some embodiments;

[0049] Figure 8 A partial cross-sectional view of another display substrate provided in some embodiments;

[0050] Fig. 9 A schematic diagram of the distribution of touch control units in a display substrate provided in some embodiments;

[0051] Fig.10 A schematic diagram of the distribution of touch control units in another display substrate provided in some embodiments;

[0052] Fig.11 A schematic diagram of the distribution of touch control units in another display substrate provided in some embodiments;

[0053] Fig.12 A schematic diagram of the distribution of touch control units in another display substrate provided in some embodiments;

[0054] Fig.13 is a flow chart of a method for preparing a display substrate provided in some embodiments;

[0055] Fig.14 A flowchart of some steps in another method for preparing a display substrate provided in some embodiments;

[0056] Fig.15 A flowchart of some steps in another method for preparing a display substrate provided in some embodiments;

[0057] Fig.16 The present invention is a flow chart of another method for preparing a display substrate provided in some embodiments.

[0058] Description of reference numerals:

[0059] 1-substrate, 2-display functional layer, 21-anode, 22-light-emitting device, 221-first functional layer, 222-light-emitting layer, 223-second functional layer, 23-cathode, 3-touch functional layer, 31-first touch electrode, 32-second touch electrode, 33-bridging electrode, 4-isolation structure, 41-first isolation part, 42-second isolation part, 43-third isolation part, 5-connecting electrode, AA1-first display area, AA2-second display area, UDC-under-screen camera area, PDL-pixel definition layer, PLN-planarization layer, U1-first touch unit area, U2-second touch unit area, U3-hybrid touch unit area. DETAILED DESCRIPTION

[0060] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0062] It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0063] It should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0064] It should be understood that directional terms such as "up", "down", "left" and "right" may be defined including but not limited to the orientation relative to the schematic placement of components in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative description and clarification, and may change accordingly according to changes in the orientation of the components in the drawings.

[0065] It should be understood that the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0066] It should be understood that exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0067] With the development of technology, more and more electronic devices are using touch display devices to ensure that users can conveniently control electronic devices through touch operations. However, due to the light transmittance requirements of the under-screen camera area (UDC), the under-screen camera area (UDC) cannot use the same metal touch lines as the normal display area.

[0068] Based on this, the embodiments of the present disclosure provide a display substrate and a method for preparing the same, and a touch display device, which can realize actual touch control on the UDC while ensuring the UDC transmittance, so as to effectively improve the touch performance.

[0069] See also Figure 1 and Figure 2 The display substrate provided by the embodiment of the present disclosure includes: a substrate 1, and a display function layer 2 and a touch function layer 3 located on the substrate 1. The display substrate has a first display area AA1 and a second display area AA2, and the transmittance of the first display area AA1 is greater than the transmittance of the second display area AA2. The touch function layer 3 includes: a first touch electrode 31, a second touch electrode 32 and at least one bridge electrode 33. The first touch electrode 31 is located in the first display area AA1, and the first touch electrode 31 is located on the side of the display function layer 2 facing the substrate 1. The second touch electrode 32 is located in the second display area AA2, and the second touch electrode 32 is located on the side of the display function layer 2 away from the substrate 1. The bridge electrode 33 is located in the second display area AA2, and the first touch electrode 31 and the bridge electrode 33 are electrically connected. Among them, the transmittance of the first touch electrode 31 is greater than the transmittance of the second touch electrode 32.

[0070] By way of example, the first display area AA1 includes an under-screen camera area UDC; that is, the orthographic projection of the first display area AA1 on the substrate 1 may overlap with the orthographic projection of the camera area UDC on the substrate 1, or the orthographic projection of the camera area UDC on the substrate 1 is located within the orthographic projection of the first display area AA1 on the substrate 1.

[0071] For example, the second display area AA2 is a common display area. The second display area AA2 can be arranged around the first display area AA1, or only arranged on one side or both sides of the first display area AA1, etc. The embodiments of the present disclosure are not limited to this.

[0072] Optionally, the first touch control electrode 31 includes a transparent conductive electrode. The number of the first touch control electrode 31 may be one or more.

[0073] In some examples, the material of the transparent conductive electrode includes: Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), or Indium Gallium Zinc Oxide (IGZO).

[0074] Optionally, the material of the second touch control electrode 32 includes: one or more of silver, copper, aluminum, titanium, molybdenum and alloys thereof. There are multiple second touch control electrodes 32 .

[0075] In some examples, the second touch electrode 32 includes a stacked structure of titanium, aluminum and titanium (ie, Ti / Al / Ti) or a stacked structure of molybdenum, aluminum and titanium (ie, Mo / Al / Ti).

[0076] In the embodiment of the present disclosure, the transmittance of the first display area AA1 is greater than the transmittance of the second display area AA2. In the embodiment of the present disclosure, the first touch electrode 31 of the touch function layer 3 located in the first display area AA1 is arranged between the display function layer 2 and the substrate 1, and the second touch electrode 32 of the touch function layer 3 located in the second display area AA2 is arranged on the side of the display function layer 2 away from the substrate 1, and the first touch electrode 31 can be connected and led out through the bridge electrode 33 located in the second display area AA2, and the transmittance of the first touch electrode 31 is greater than the transmittance of the second touch electrode 32. In this way, the embodiment of the present disclosure realizes the integration of the touch function in the display substrate, which is not only easy to prepare to improve the production efficiency, but also can realize actual touch control in the first display area AA1 by arranging the first touch electrode 31 with higher transmittance in the first display area AA1 and transmitting the signal through the bridge electrode 33, while ensuring or even improving the transmittance of the first display area AA1 (for example, including the under-screen camera area UDC), thereby effectively improving the touch performance of the display substrate.

[0077] It can be understood that the display function layer 2 in the display substrate is used to realize the display function, and there are many specific implementations. The embodiment of the present disclosure does not specifically limit the structure of the display function layer 2, and is limited to realizing the display function.

[0078] See also Figure 3~Figure 5In some embodiments of the present disclosure, the display substrate further includes an isolation structure 4. The isolation structure 4 includes a first isolation portion 41 and a second isolation portion 42; wherein the second isolation portion 42 is located on a side of the first isolation portion 41 away from the substrate 1, and the orthographic projection of the first isolation portion 41 on the substrate 1 is located within the orthographic projection of the second isolation portion 42 on the substrate 1. The second touch electrode 32 and / or the bridge electrode 33 are at least arranged on the same layer as the isolation structure 4.

[0079] In the embodiment of the present disclosure, the second touch electrode 32 and / or the bridge electrode 33 are at least disposed in the same layer as the isolation structure 4 , which can effectively reduce the thickness of the display substrate.

[0080] In addition, it can be understood that the main function of the isolation structure 4 in the display functional layer 2 is to isolate the light-emitting material in the light-emitting device to omit the evaporation process of the fine metal mask (FMM). The composition, preparation, etc. of the isolation structure 4 mentioned here and below are further described in patents PCT / CN2023 / 134518, 202310759370.2, 202310740412.8, 202310707209.0, and 202311346196.5 for reference. The disclosed embodiment does not limit the specific structure of the isolation structure 4. For example, the isolation structure 4 can be integrated or layered; for example, the cross-sectional morphology of the isolation structure 4 can be an inverted trapezoid, T-shaped, I-shaped or other shapes, and the overall appearance is wide at the top and narrow at the bottom, so as to achieve the isolation effect. Figure 3~Figure 5 In the above, the isolation structure 4 includes a first isolation portion 41 and a second isolation portion 42 covering the first isolation portion 41, but is not limited thereto. Figure 6 As shown in , in some examples, the isolation structure 4 further includes a third isolation portion 43. The third isolation portion 43 is located on the side of the first isolation portion 41 facing the substrate 1, and the orthographic projection of the first isolation portion 41 on the substrate 1 is located within the orthographic projection of the third isolation portion 43 on the substrate 1.

[0081] It should be added that the embodiment of the present disclosure does not limit the material of each isolation part in the isolation structure 4.

[0082] By way of example, the material of the first isolation portion 41 includes at least one of aluminum, copper or silver.

[0083] By way of example, the material of the second isolation portion 42 includes at least one of titanium or molybdenum.

[0084] Illustratively, the material of the third isolation portion 43 includes at least one of titanium or molybdenum.

[0085] In addition, in some embodiments of the present disclosure, the material of the second touch electrode 32 and / or the bridging electrode 33 is the same as that of the isolation structure 4; that is, the second touch electrode 32 and / or the bridging electrode 33 and the isolation structure 4 are arranged in the same layer and material, so that they can be prepared in the same preparation process, thereby simplifying the preparation process of the touch function layer 3, and effectively improving production efficiency and yield, and also helping to reduce production costs.

[0086] In some embodiments of the present disclosure, please combine Figure 3 and Figure 4 It is understood that the second touch electrode 32 and the bridging electrode 33 can be set in the same layer and the same material as the isolation structure 4, and the second touch electrode 32, the bridging electrode 33 and the isolation structure 4 can be formed in the same process, so that the structural morphology of the three is basically the same; in other words, the cross-sectional morphology of the second touch electrode 32 and the bridging electrode 33 along the first direction perpendicular to the substrate is the same as the cross-sectional morphology of the isolation structure 4 along the first direction; the first direction is the line width direction of the second touch electrode 32 and / or the bridging electrode 33 (for example, the X direction); it is worth noting that if the width of the cross section is different, it is also considered that the cross-sectional morphology is the same. In addition, the number of film layers constituting the isolation structure 4 is the same as the number of film layers constituting the second touch electrode 32 and the bridging electrode 33. For example, the cross-sectional morphology of the isolation structure 4 is T-shaped, and the cross-sectional morphology of the second touch electrode 32 and the bridging electrode 33 is also T-shaped; for another example, the cross-sectional morphology of the isolation structure 4 is I-shaped, and the cross-sectional morphology of the second touch electrode 32 and the bridging electrode 33 is also I-shaped.

[0087] Please continue reading Figure 3~Figure 6 In some embodiments of the present disclosure, the display function layer 2 includes a pixel definition layer PDL. The isolation structure 4 is located on a side of the pixel definition layer PDL away from the substrate 1 .

[0088] By way of example, the pixel definition layer PDL includes but is not limited to an inorganic pixel definition layer, that is, the pixel definition layer PDL may be formed by using an inorganic material.

[0089] In some embodiments of the present disclosure, please combine Figure 1 It is understood that the first touch electrodes 31 and / or the second touch electrodes 32 include conductive patterns distributed in a grid shape.

[0090] Here, the conductive pattern distributed in a grid shape includes: the conductive pattern can directly adopt a grid pattern (that is, each unit in the grid is a closed shape); or, the conductive pattern can include multiple independent sub-patterns to form a grid shape by interconnecting, for example: the second touch electrode 32 includes multiple block electrodes, and the block electrodes in the second touch electrode 32 can be interconnected into a grid shape through connecting electrodes.

[0091] In some examples, combine Figure 1 and Figure 3~Figure 6 It is understood that the display function layer 2 includes a pixel definition layer PDL. The pixel definition layer PDL has a plurality of pixel openings. The display function layer 2 also includes: light emitting devices 22 respectively located in each pixel opening. The orthographic projection of the conductive pattern on the substrate 1 is distributed within the orthographic projection of the interval between the corresponding light emitting devices 22 on the substrate 1. In this way, the electrodes of the touch function layer 3 integrated in the display substrate in the embodiment of the present disclosure can be wired around the peripheral intervals of the light emitting devices 22 to effectively improve the light transmittance of the display substrate.

[0092] By way of example, the light-emitting device 22 includes a stacked first functional layer 221, a light-emitting layer 222 and a second functional layer 223; wherein the first functional layer 221 includes, for example, a hole injection layer, a hole transport layer, an electron blocking layer, etc.; the second functional layer 223 includes, for example, an electron injection layer, an electron transport layer, a hole blocking layer, etc.

[0093] For example, the first functional layer 221 may be connected to the first electrode 21, which may be, for example, an anode. The second functional layer 223 may be connected to the second electrode 23, which may be, for example, a cathode.

[0094] For example, the first isolation portion 41 of the isolation structure 4 can be overlapped with the cathode, or directly used as a part of the cathode to transmit the voltage signal VSS. Of course, in other specific embodiments, the cathode can also be overlapped with the third isolation portion 43.

[0095] In other examples, combine Figure 1 and Figure 3~Figure 6 It is understood that a plurality of isolation openings are formed by the isolation structure 4, and the isolation openings are connected to the pixel openings. The orthographic projection of the conductive pattern on the substrate 1 is at least distributed within the orthographic projection of the intervals between the corresponding isolation structures 4 on the substrate 1. In this way, the electrodes of the touch function layer 3 integrated in the display substrate in the embodiment of the present disclosure can be wired based on the intervals between the isolation structures 4 to effectively improve the light transmittance of the display substrate.

[0096] It is understood that in some embodiments, the first touch electrode 31 and the isolation structure 4 are located in different layers. If the first touch electrode 31 is a grid-shaped conductive line, the orthographic projection of the first touch electrode 31 on the substrate 1 may also overlap with the orthographic projection of the isolation structure 4 on the substrate 1 .

[0097] Please combine Figure 1 and Figure 3~Figure 6It is understood that in some embodiments of the present disclosure, the display substrate further includes: an array layer disposed between the substrate 1 and the display function layer 2; the array layer includes a plurality of connection electrodes 5. The array layer includes multiple metal layers, for example, a first metal layer, a second metal layer, a third metal layer, and a fourth metal layer; an insulating layer is disposed between adjacent metal layers. Optionally, a pixel driving circuit is disposed in the array layer, the driving circuit is connected to the anode, and the pixel driving circuit includes a transistor and a storage capacitor. The transistor includes a semiconductor, a gate, a source and a drain. The storage capacitor includes a first plate and a second plate. As an example, the gate and the first plate can be located in the first metal layer, the second plate can be located in the second metal layer, and the source and the drain can be located in the third metal layer; part of the signal routing of the pixel driving circuit can be located in the fourth metal layer, and the connection electrode 5 can be disposed in the same layer as any metal layer in the array layer. Preferably, the connection electrode 5 is disposed in the same layer as the metal layer with the smallest distance from the anode.

[0098] By way of example, the second touch electrode 32 is connected to the connecting electrode 5 .

[0099] Here, the connecting electrode 5 corresponding to the second touch electrode 32 can not only perform wiring connection on the second touch electrode 32, for example, interconnect the second touch electrodes 32 in the same touch unit area into a grid shape, or interconnect the independent sub-patterns in the same second touch electrode 32 into a grid shape, etc., but can also be used as a routing to transmit the touch signal transmitted by the second touch electrode 32 to the touch IC.

[0100] For example, see Figure 7 The first touch electrodes 31 are connected to the corresponding connection electrodes 5 in sequence through the bridge electrodes 33 and the second touch electrodes 32 .

[0101] Here, the connection electrodes 5 correspondingly connected to the first touch electrodes 31 through the bridge electrodes 33 and the second touch electrodes 32 can be used as routing lines to transmit the touch signals transmitted by the first touch electrodes 31 to the touch IC.

[0102] Alternatively, in other specific embodiments, see Figure 8 The first touch control electrode 31 is connected to the corresponding connection electrode 5 through the bridge electrode 33, and the connection electrode 5 can be directly electrically connected to the touch control IC.

[0103] In other words, the second touch electrodes 32 in the touch function layer 3 can be directly connected to the connection electrodes 5 thereunder, so that the touch signals of the corresponding areas can be transmitted. In addition, in order to transmit the touch signals of the areas where the first touch electrodes 31 are located, for example Figure 7As shown in ; the first touch electrode 31 in the touch function layer 3 can be first connected to the second touch electrode 32 through the bridge electrode 33, and then the second touch electrode 32 is connected to the connection electrode 5 below it, so as to transmit the corresponding touch signal; it can also be for example Figure 8 As shown in , the bridging electrode 33 is directly connected to the corresponding connecting electrode 5 to transmit the corresponding touch signal.

[0104] For example, please continue to see Figure 3~Figure 5 , the display function layer 2 includes a pixel definition layer PDL. The display substrate also includes a planarization layer PLN covering the array layer; wherein the first touch electrode 31 is located between the planarization layer PLN and the pixel definition layer PDL. Vias are provided on the pixel definition layer PDL and the planarization layer PLN, and the second touch electrode 32 is connected to the corresponding connection electrode 5 through the vias. In some specific embodiments, the first touch electrode 31 can be arranged in the same layer as the anode 21; in other embodiments, the planarization layer PLN is provided with multiple layers, the anode 21 is located on the planarization layer PLN with the smallest distance from the pixel definition layer PDL, and the first touch electrode 31 can be located on the side of the anode 21 facing the substrate 1, and the first touch electrode 31 is located between the two layers of the planarization layer PLN, that is, the anode 21 and the first touch electrode 31 are located in different film layers.

[0105] It is worth mentioning that, in some embodiments of the present disclosure, the first display area AA1 includes an under-screen camera area UDC.

[0106] Please combine Fig. 9 and Figure 3~Figure 6 It is understood that the touch function layer 3 includes: multiple touch unit areas; the multiple touch unit areas include at least one first touch unit area U1 located in the first display area AA1, and multiple second touch unit areas U2 located in the second display area AA2. Among them, the first touch unit area U1 is provided with a first touch electrode 31; the second touch unit area U2 is provided with a second touch electrode 32; and at least one of the second touch unit areas U2 is provided with a bridge electrode 33. It is worth noting that the bridge electrode 33 is independently provided and is not connected to the second touch electrode 32 of the second touch unit area U2.

[0107] Correspondingly, the first touch electrodes 31 of the first touch unit area U1 are connected to the corresponding bridging electrodes 33 , and are connected to the corresponding connecting electrodes 5 through the bridging electrodes 33 .

[0108] Here, it can be understood that part of the edge of the first touch electrode 31 in the first touch unit area U1 can extend to directly below the bridge electrode 33 so that the bridge electrode 33 can be directly connected to the first touch electrode 31 through the corresponding via hole.

[0109] Please combine Figure 10~Figure 12 and Figure 3~Figure 6 It is understood that the touch function layer includes: multiple touch unit areas; the multiple touch unit areas include: a single touch unit area and a mixed touch unit area U3; wherein the mixed touch unit area U3 is simultaneously provided with a portion of first touch electrodes 31 and a portion of second touch electrodes 32 and a bridging electrode 33, and the first touch electrode 31 of the mixed touch unit area U3 is connected to the second touch electrode 32 of the mixed touch unit area U3 through the bridging electrode 33, and is connected to the corresponding connecting electrode 5 through the second touch electrode 32 of the mixed touch unit area U3.

[0110] For example, see Fig.10 , a single touch unit area includes a first touch unit area AA1 and a second touch unit area AA2. The first touch unit area U1 is provided with a first touch electrode 31. The second touch unit area U2 is provided with a second touch electrode 32. The first touch electrode 31 of the first touch unit area U1 is connected to the bridge electrode 33 of the hybrid touch unit area U3, and is connected to the corresponding connection electrode 5 through the bridge electrode 33. It is worth noting that the bridge electrode 33 connected to the first touch electrode 31 of the first touch unit area U1 and the bridge electrode 33 connected to the first touch electrode 31 of the hybrid touch unit area U3 itself are not connected to each other, that is, the two do not interfere with each other.

[0111] Alternatively, in some other embodiments, see Fig.11 At least one of the second touch unit areas U2 is further provided with a bridging electrode 33, which is independently arranged and is not connected to the second touch electrodes 32 in the second touch unit area U2. The first touch electrodes 31 in the first touch unit area U1 are connected to the bridging electrode 33 in the second touch unit area U2, and are connected to the corresponding connecting electrodes 5 through the bridging electrode 33.

[0112] For example, see Fig.12 , the single touch unit area includes a second touch unit area AA2. The second touch unit area U2 is provided with a second touch electrode 32. The second touch electrode 32 is connected to the corresponding connection electrode 5.

[0113] It should be noted that Figure 9~Figure 12 The bridging electrode 33 in the figure is a schematic expression, which is only used to illustrate the lead-out connection relationship of the first touch electrode 31, and is not limited to the illustrated shape and illustrated position. In addition, it can be understood that the first touch electrode 31, the second touch electrode 32 and the bridging electrode 33 in the embodiment of the present disclosure may include, for example, a plurality of independent sub-patterns (such as sub-electrodes) connected in series with each other, wherein each independent sub-pattern may be set in one-to-one correspondence with a pixel. This embodiment of the present disclosure will not be described in detail.

[0114] In addition, optionally, the multiple touch unit areas mentioned in the above embodiments can be distributed in an array, and the orthographic projection area of ​​each touch unit area on the substrate is the same. Optionally, the orthographic projection area of ​​the touch unit area on the substrate can be set to a first size or a second size to match the touch operation mode; wherein the first size is larger than or much larger than the second size; for example, if the orthographic projection area of ​​the touch unit area on the substrate adopts the first size, it is suitable for sensing touch operations that require a larger touch area or are farther away from the screen; or, for example, if the orthographic projection area of ​​the touch unit area on the substrate adopts the second size, it is suitable for sensing touch operations that require a smaller touch area or are closer to the screen.

[0115] Based on the same inventive concept, the embodiments of the present disclosure also provide a method for preparing a display substrate, which is used to prepare the display substrate described in some of the above embodiments. The technical advantages of the above display substrate are also possessed by the preparation method. Moreover, the implementation solution provided by the preparation method is similar to the implementation solution recorded in the above display substrate, so the specific limitations in one or more preparation method embodiments provided below can refer to the relevant limitations on the display substrate above, and will not be repeated here.

[0116] See also Fig.13 , the preparation method includes the following steps S100~S300.

[0117] S100 , forming a first touch electrode on one side of a substrate, wherein the first touch electrode is located in a first display area.

[0118] For example, the first touch control electrode is a light-transmitting conductive electrode. The material of the transparent conductive electrode includes but is not limited to indium tin oxide, indium zinc oxide or indium gallium zinc oxide.

[0119] For example, the first display area includes an under-screen camera area. The first touch electrodes can share a mask plate used for the UDC transparent conductive material in the display substrate, so as to etch the first touch electrodes of the UDC through a patterning process.

[0120] The patterning process mentioned herein generally refers to a process for forming a predetermined pattern, such as a photolithography process. Exemplarily, the first touch electrode is patterned using a photolithography process, which refers to a process for forming a pattern using tools or equipment such as photoresist, mask, and exposure machine, and includes film formation, exposure, development, etching, and other steps.

[0121] S200 , forming a display function material layer on a side of the substrate away from the first touch electrode.

[0122] S300, at least one bridging electrode and a plurality of second touch electrodes are formed on a side of the display functional material layer away from the substrate; wherein the bridging electrode and the second touch electrode are located in the second display area; the bridging electrode penetrates the display functional material layer and connects the corresponding first touch electrodes; the transmittance of the first display area is greater than the transmittance of the second display area, and the transmittance of the first touch electrode is greater than the transmittance of the second touch electrode.

[0123] For example, the second display area is a common display area. The second display area can be arranged around the first display area, or only arranged on one side or both sides of the first display area, etc. The embodiments of the present disclosure are not limited to this.

[0124] For example, the materials of the bridge electrode and the second touch electrode include: one or more of silver, copper, aluminum, titanium, molybdenum and alloys thereof; for example, the materials may be a stacked structure of titanium, aluminum and titanium.

[0125] See also Fig.14 In some embodiments of the present disclosure, a display function material layer is formed on a side of the substrate away from the first touch electrode in step S200, including S210.

[0126] S210, forming a pixel definition material layer covering the first touch electrode on one side of the substrate, and etching the pixel definition material layer to form a via hole, wherein a portion of the first touch electrode is exposed through the via hole.

[0127] Preferably, in step S300 , at least one bridging electrode and a plurality of second touch electrodes are formed on a side of the display functional material layer away from the substrate, including S310 .

[0128] S310, forming an isolation material layer on a side of the etched pixel definition material layer away from the substrate.

[0129] S320, patterning the isolation material layer to form a second touch electrode and a bridge electrode, and the bridge electrode is connected to the first touch electrode through a via hole.

[0130] See also Fig.15 In some embodiments of the present disclosure, at least one bridging electrode and a plurality of second touch electrodes are formed on a side of the display functional material layer away from the substrate in step S300, and the method may further include: in step S320, while patterning the isolation material layer to form the second touch electrodes and the bridging electrodes, an isolation structure is formed, and the isolation structure encloses an isolation opening.

[0131] In the disclosed embodiment, the second touch electrode and the bridging electrode are formed in the same step as the isolation structure, which can effectively simplify the preparation process of the touch function layer, effectively improve production efficiency and yield, and also help reduce production costs.

[0132] It is worth noting that since the cathode 23 is overlapped with the isolation structure 4 to realize the transmission of the cathode 23 signal, and for the display substrate, in the frame area, the isolation structure 4 is connected to the metal wiring in the array layer for transmitting the cathode 23 signal, so it is necessary to open a hole in the pixel definition layer PDL in the frame area to expose the metal wiring in the array layer, so as to facilitate the subsequent connection of the isolation structure 4 with the metal wiring in the hole area; in addition, the first touch electrode 31, the second touch electrode 32, and the bridging electrode 33 in the present embodiment have vias on the pixel definition layer PDL, so the hole in the frame area and the via can be formed in the same process without the need for additional masks, thereby reducing production costs.

[0133] From above, please continue to read Fig.15 , the method for preparing the display substrate further includes S400 and S500.

[0134] S400, etching the etched pixel definition material layer to form a plurality of pixel openings, wherein the pixel openings are connected to the corresponding isolation openings.

[0135] S500 , forming light-emitting devices in each pixel opening.

[0136] See also Fig.16 In some embodiments of the present disclosure, before forming the first touch electrode on one side of the substrate in step S100, the preparation method may further include the following steps S010 to S020.

[0137] S010, forming an array layer on a substrate, wherein the array layer includes a plurality of connecting electrodes.

[0138] S020, forming a planarization layer covering the array layer.

[0139] Accordingly, the first touch electrode in step S100 is formed on a side of the planarization layer away from the substrate.

[0140] The process of etching the pixel definition material layer to form via holes in step S210 also includes: etching the pixel definition material layer to form via holes, wherein the via holes expose the connection electrodes; and connecting the second touch electrodes to the connection electrodes through the corresponding via holes.

[0141] It can be understood that in some embodiments where the bridging electrode is directly connected to the connecting electrode, the bridging electrode is connected to the connecting electrode through the corresponding aforementioned via hole.

[0142] It is worth mentioning that in some of the above embodiments, the planarization layer covers the array layer (i.e., the connection electrode), and the via holes for exposing the connection electrode need to be formed in the planarization layer. Therefore, the via holes in the planarization layer and the pixel definition material layer can be formed in the same step, or the via holes in the planarization layer can be formed in advance, and then when the via holes are formed in the pixel definition material layer, the via holes in the pixel definition material layer are connected to the via holes in the planarization layer.

[0143] It should be understood that, although the various steps in the flow charts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flow charts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0144] Some embodiments of the present disclosure further provide a touch display device, comprising: a display substrate as described in any of the above embodiments; or a display substrate prepared by the preparation method as described in any of the above embodiments.

[0145] By way of example, the touch display device further includes: a touch IC. The touch IC is coupled to the display substrate and is configured to perform touch recognition according to the touch signals transmitted by the first touch electrodes and the second touch electrodes.

[0146] For example, the touch IC may be disposed on a PCB, or integrated on a display substrate.

[0147] For example, the touch display device is a self-capacitance touch display device, and each touch electrode (or touch unit) in the touch function layer can be connected to the touch IC through the corresponding connection electrode. When the user performs a touch operation (such as contact touch or floating touch), the capacitance of the corresponding touch electrode to the ground in the touch area will change, and transmit a signal to the touch IC, so that the touch IC can perform touch recognition according to the signal.

[0148] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0149] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A display substrate, characterized in that: include: A substrate and a display function layer and a touch function layer located on the substrate; The display substrate has a first display area and a second display area, and the light transmittance of the first display area is greater than the light transmittance of the second display area; The touch function layer includes: A first touch electrode is located in the first display area, and the first touch electrode is located on a side of the display function layer facing the substrate; A second touch electrode is located in the second display area, and the second touch electrode is located on a side of the display function layer away from the substrate; At least one bridging electrode; located in the second display area, the first touch electrode and the bridging electrode are electrically connected; Wherein, the light transmittance of the first touch electrode is greater than the light transmittance of the second touch electrode.

2. The display substrate according to claim 1, characterized in that: Also includes an isolation structure; the isolation structure includes a first isolation portion and a second isolation portion; wherein the second isolation portion is located on a side of the first isolation portion away from the substrate, and the orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the second isolation portion on the substrate; Wherein, the second touch electrode and / or the bridge electrode are at least arranged in the same layer as the isolation structure; Preferably, a cross-sectional morphology of the second touch electrode and / or the bridge electrode along a first direction perpendicular to the substrate is the same as a cross-sectional morphology of the isolation structure along the first direction; the first direction is a line width direction of the second touch electrode and / or the bridge electrode; Preferably, the material of the first isolation portion includes at least one of aluminum, copper or silver; Preferably, the material of the second isolation portion includes at least one of titanium or molybdenum; Preferably, the material of the second touch electrode and / or the bridge electrode is the same as the material of the isolation structure; Preferably, the isolation structure further comprises a third isolation portion, the third isolation portion is located on a side of the first isolation portion facing the substrate, and an orthographic projection of the first isolation portion on the substrate is located within an orthographic projection of the third isolation portion on the substrate; Preferably, the material of the third isolation portion includes at least one of titanium or molybdenum; Preferably, the display function layer includes a pixel definition layer; and the isolation structure is located on a side of the pixel definition layer away from the substrate.

3. The display substrate according to claim 2, characterized in that: The first touch electrode and / or the second touch electrode comprises a conductive pattern distributed in a grid shape; Preferably, the pixel definition layer has a plurality of pixel openings; the display function layer further comprises: light emitting devices respectively located in each of the pixel openings; the orthographic projection of the conductive pattern on the substrate is distributed within the orthographic projection of the corresponding interval between the light emitting devices on the substrate; Preferably, a plurality of isolation openings are formed by enclosing the isolation structure, and the isolation openings are connected to the pixel openings; the orthographic projection of the conductive pattern on the substrate is at least distributed within the orthographic projection of the intervals between the corresponding isolation structures on the substrate.

4. The display substrate according to claim 1, characterized in that: The display substrate further comprises: an array layer disposed between the substrate and the display function layer; the array layer comprises a plurality of connection electrodes; wherein, The second touch electrode is connected to the connecting electrode; The first touch electrode is connected to the corresponding connection electrode through the bridge electrode and the second touch electrode in sequence; or the first touch electrode is connected to the corresponding connection electrode through the bridge electrode.

5. The display substrate according to claim 4, characterized in that: The display function layer includes a pixel definition layer; the display substrate also includes a planarization layer covering the array layer; wherein, The first touch electrode is located between the planarization layer and the pixel definition layer; The pixel definition layer and the planarization layer are provided with via holes, and the second touch electrodes are connected to the corresponding connection electrodes through the via holes.

6. The display substrate according to claim 4, The touch function layer includes: A plurality of touch unit areas; the plurality of touch unit areas include at least one first touch unit area located in the first display area, and a plurality of second touch unit areas located in the second display area; The first touch control unit area is provided with the first touch control electrode; the second touch control unit area is provided with the second touch control electrode, and at least one of the second touch control unit areas is provided with the bridge electrode; The first touch control electrodes in the first touch control unit area are connected to the corresponding bridging electrodes, and are connected to the corresponding connecting electrodes through the bridging electrodes.

7. The display substrate according to claim 4, characterized in that: The touch function layer includes: a plurality of touch unit areas; the plurality of touch unit areas include: a single touch unit area and a mixed touch unit area; Among them, the hybrid touch unit area is simultaneously provided with a part of the first touch electrodes and a part of the second touch electrodes, as well as the bridging electrode; the first touch electrodes in the hybrid touch unit area are connected to the second touch electrodes in the hybrid touch unit area through the bridging electrode, and are connected to the corresponding connecting electrodes through the second touch electrodes in the hybrid touch unit area.

8. The display substrate according to claim 7, characterized in that: The single touch unit area includes the first touch unit area and the second touch unit area; the first touch unit area is provided with the first touch electrode; the second touch unit area is provided with the second touch electrode; the first touch electrode of the first touch unit area is connected to the bridge electrode of the mixed touch unit area; or at least one of the second touch unit areas is further provided with the bridge electrode, and the first touch electrode of the first touch unit area is connected to the bridge electrode of the second touch unit area; Preferably, the single touch unit area includes the second touch unit area; the second touch unit area is provided with the second touch electrodes; and the second touch electrodes are connected to the corresponding connection electrodes.

9. The display substrate according to any one of claims 1 to 8, characterized in that: The first touch electrode comprises a transparent conductive electrode; Preferably, the material of the transparent conductive electrode includes: indium tin oxide, indium zinc oxide or indium gallium zinc oxide.

10. The display substrate according to claim 1, characterized in that: The first display area includes an under-screen camera area.

11. A method for preparing a display substrate, characterized in that: include: forming a first touch electrode on one side of the substrate, wherein the first touch electrode is located in the first display area; forming a display function material layer on a side of the substrate away from the first touch electrode; At least one bridging electrode and a plurality of second touch electrodes are formed on a side of the display functional material layer away from the substrate; wherein the bridging electrode and the second touch electrodes are located in a second display area; the bridging electrode penetrates the display functional material layer and connects the corresponding first touch electrodes; the transmittance of the first display area is greater than the transmittance of the second display area, and the transmittance of the first touch electrode is greater than the transmittance of the second touch electrode.

12. The method for preparing a display substrate according to claim 11, characterized in that: The step of forming a display function material layer on a side of the substrate away from the first touch electrode includes: forming a pixel definition material layer covering the first touch electrode on one side of the substrate, and etching the pixel definition material layer to form a via hole, wherein a portion of the first touch electrode is exposed through the corresponding via hole; Preferably, the step of forming at least one bridging electrode and a plurality of second touch electrodes on a side of the display function material layer away from the substrate comprises: An isolation material layer is formed on a side of the etched pixel definition material layer away from the substrate; the isolation material layer is patterned to form the second touch electrode and the bridge electrode, and the bridge electrode is connected to the first touch electrode through the via hole.

13. The method for preparing a display substrate according to claim 12, characterized in that: The step of forming at least one bridging electrode and a plurality of second touch electrodes on a side of the display function material layer away from the substrate further includes: While patterning the isolation material layer to form the second touch electrode and the bridge electrode, an isolation structure is formed, wherein the isolation structure encloses an isolation opening; Preferably, the preparation method further comprises: etching the etched pixel definition material layer to form a plurality of pixel openings, wherein the pixel openings are connected to corresponding isolation openings; A light emitting device is formed in each of the pixel openings.

14. The method for preparing a display substrate according to claim 12, characterized in that: Before forming the first touch electrode on one side of the substrate, the preparation method further includes: forming an array layer on the substrate; the array layer comprises a plurality of connecting electrodes; forming a planarization layer covering the array layer; Wherein, the first touch electrode is formed on a side of the planarization layer away from the substrate; Preferably, the process of etching the pixel definition material layer to form via holes further includes: etching the pixel definition material layer to form via holes, wherein the via holes expose the connection electrodes; and the second touch electrodes are connected to the connection electrodes through the corresponding via holes.

15. A touch display device, characterized in that: include: A display substrate as claimed in any one of claims 1 to 10, or a display substrate prepared by the preparation method as claimed in any one of claims 11 to 14.

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