Touch display substrate and display device

Abstract

The present disclosure provides a touch display substrate and a display device, and belongs to the technical field of display, which can solve the problem of large touch blind area of the existing touch display substrate. The touch display substrate has a display area and a peripheral area, and comprises a substrate, a display layer and a touch layer. The touch layer comprises a plurality of touch electrodes and a plurality of touch signal lines connected one by one with the plurality of touch electrodes. The plurality of touch electrodes are located in the display area, and the plurality of touch signal lines extend from the display area to the peripheral area. The touch display substrate further comprises a plurality of multiplexers located in the peripheral area. The plurality of touch electrodes are divided into a plurality of groups arranged side by side along a second direction. The touch electrodes in each group are arranged side by side along a first direction, and the touch electrodes in each group are divided into a plurality of touch units. At least part of the plurality of touch units in the same group are connected to the multiplexers located on different sides of the display area. The touch display substrate can effectively reduce the proportion of the touch blind area.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a touch display substrate and a display device. Background Technology

[0002] Touch display devices are display devices with touch sensing structures. When a user touches an icon on the screen, the touch sensing system sends a touch signal to the display device's processor. The processor then performs the corresponding function according to a pre-set program. Common touch sensing systems employ resistive, capacitive, acoustic, and pressure sensing technologies. Regardless of the sensing technology used, the principle of touch display devices is to identify and detect the user's touch points, convert them into coordinate inputs, and transmit them to the display device. The display device then executes the next operation, thereby achieving human-computer interaction.

[0003] It is evident that touch display devices are an emerging industry integrating display technology and sensor technology, and have become an indispensable and important component of many electronic products. In recent years, the development of displays towards flexible displays has driven the development of touch displays towards flexible touch technology. Flexible touch displays require the use of flexible substrates, and the touch sensing electrodes must possess characteristics such as thinness, strong adhesion to the flexible substrate, high flexibility, and high conductivity, in order to achieve the function of displaying high-quality images under different curvatures. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. On one hand, it provides a touch display substrate having a display area and a peripheral area located around the display area. The touch display substrate includes a substrate, a display layer disposed on the substrate, and a touch layer located on the side of the display layer opposite to the substrate. The touch layer includes a plurality of touch electrodes and a plurality of touch signal lines connected to the plurality of touch electrodes in a one-to-one correspondence. The plurality of touch electrodes are located in the display area, and the plurality of touch signal lines extend from the display area to the peripheral area. The touch display substrate also includes a plurality of multiplexers located in the peripheral area. The plurality of touch electrodes are divided into multiple groups arranged side-by-side along a second direction, and the touch electrodes in each group are arranged side-by-side along a first direction, and each group of touch electrodes is divided into a plurality of touch units. At least a portion of the plurality of touch units located in the same group are connected to multiplexers located on different sides of the display area.

[0005] In some examples, the display area has a first side and a second side disposed opposite to each other along the second direction; the touch electrodes in each group are divided into two touch units, the two touch units pointing from the first side to the second side being a first touch unit and a second touch unit, respectively; the plurality of multiplexers include a first multiplexer located on the first side and a second multiplexer located on the second side; each touch electrode in the first touch unit is connected to the first multiplexer via a touch signal line connected thereto; each touch electrode in the second touch unit is connected to the second multiplexer via a touch signal line connected thereto.

[0006] In some examples, both the first multiplexer and the second multiplexer include a plurality of first multiplexing units; the plurality of first touch units are divided into a plurality of first touch unit groups arranged side by side along the second direction, and one first touch unit group is connected to one of the first multiplexing units in the first multiplexer; the plurality of second touch units are divided into a plurality of second touch unit groups arranged side by side along the second direction, and one second touch unit group is connected to one of the first multiplexing units in the second multiplexer.

[0007] In some examples, both the first multiplexer and the second multiplexer include a second multiplexing unit and a plurality of first multiplexing units connected to the second multiplexing unit; the plurality of first touch units are divided into a plurality of first touch unit groups arranged side by side along the second direction, and one first touch unit group is connected to one of the first multiplexing units in the first multiplexer; the plurality of second touch units are divided into a plurality of second touch unit groups arranged side by side along the second direction, and one second touch unit group is connected to one of the first multiplexing units in the second multiplexer.

[0008] In some examples, the plurality of first multiplexing units in the first multiplexer are arranged side by side along the second direction; and / or, the plurality of second multiplexing units in the second multiplexer are arranged side by side along the second direction.

[0009] In some examples, the second multiplexing unit and the plurality of first multiplexing units in the first multiplexer are arranged side by side along the second direction; and / or, the second multiplexing unit and the plurality of first multiplexing units in the second multiplexer are arranged side by side along the second direction.

[0010] In some examples, the difference between the number of touch electrodes in the first touch unit and the number of touch electrodes in the second touch unit is no greater than 1.

[0011] In some examples, the touch display substrate also includes a touch driver chip located in the peripheral area, and the plurality of multiplexers are all connected to the touch chip.

[0012] In some examples, the display layer includes a plurality of pixel units located on the substrate, each pixel unit including a pixel driving circuit and a light-emitting device connected to the pixel driving circuit; the pixel driving circuit includes a second thin-film transistor, and the multiplexer includes a first thin-film transistor; the first thin-film transistor and the second thin-film transistor are disposed in the same layer and are made of the same material.

[0013] In some examples, the display layer includes a plurality of pixel units located on the substrate, each pixel unit including a pixel driving circuit and a light-emitting device connected to the pixel driving circuit; the light-emitting device includes a first electrode, a light-emitting layer and a second electrode arranged sequentially in a direction away from the substrate; the touch signal line at least partially overlaps with the orthographic projection of the second electrode on the substrate.

[0014] In some examples, the multiplexer includes a first thin-film transistor, and the touch signal line is disposed on the same layer as the touch electrode; the touch signal line is connected to the drain of the first thin-film transistor via a first adapter electrode.

[0015] In some examples, the pixel driving circuit includes a second thin-film transistor; the first electrode of the light-emitting device is connected to the drain of the second thin-film transistor via a second transfer electrode; the first transfer electrode and the second transfer electrode are disposed in the same layer and are made of the same material.

[0016] In some examples, the display layer further includes an encapsulation layer disposed on the side of the light-emitting device away from the substrate; the touch layer is formed on the side of the encapsulation layer away from the substrate, and includes a barrier layer, a touch electrode and a touch adhesive layer stacked sequentially in the direction away from the substrate.

[0017] In some examples, the barrier layer has a conductive via extending through its thickness; the conductive via is located in the peripheral region and does not overlap with the orthographic projection of the encapsulation layer onto the substrate; the touch signal line is connected to the first adapter electrode through the conductive via.

[0018] In a second aspect, the present invention provides a display device comprising a touch display substrate as described in any of the above examples. Attached Figure Description

[0019] Figure 1 This is a planar schematic diagram of a touch display substrate.

[0020] Figure 2 This is a schematic diagram of the touch display substrate along its thickness direction.

[0021] Figure 3 This is a schematic diagram of the structure of the display layer along the thickness direction.

[0022] Figure 4 This is a planar schematic diagram of a touch layer in related technologies.

[0023] Figure 5 This is a planar schematic diagram of the touch layer provided in an embodiment of this disclosure.

[0024] Figure 6 This is a schematic diagram showing how a set of touch electrodes is divided into two touch units.

[0025] Figure 7 A schematic diagram showing the division of multiple first / second touch units into multiple first / second touch unit groups.

[0026] Figure 8 This is a schematic diagram of a first / second multiplexer including a second multiplexing unit and multiple first multiplexing units.

[0027] Figure 9 This is a schematic diagram of the peripheral area of ​​the touch display substrate provided in this disclosure along the thickness direction.

[0028] Figure 10 This is a planar schematic diagram of another touch layer provided in this disclosure.

[0029] Figure 11 This is a schematic diagram of a first / second multiplexer comprising multiple second multiplexing units and multiple first multiplexing units.

[0030] Figure 12 This is a schematic diagram showing the connection between the control terminal and the control signal line of the first / second multiplexing unit.

[0031] Figure 13 for Figure 10 The diagram shows the transmission path of the touch signal on the third side of the touch display substrate.

[0032] The attached figures are labeled as follows:

[0033] 11. Substrate; 12. Display layer; 13. Touch layer; 12a. Pixel driving circuit; 12b. Light-emitting device; 116. Planarization layer; 116a. First planarization layer; 116b. Second planarization layer; 118. Encapsulation layer; 118a. First inorganic encapsulation layer; 118b. Organic encapsulation layer; 118c. Second inorganic encapsulation layer; 21. Barrier layer; 22. Touch electrode layer; 23. Touch adhesive layer; 113. Pixel defining portion; 132. Support portion; 101. Polyimide; 102. Buffer layer; 105. First gate insulating layer; 108. Second gate insulating layer; 103. Interlayer dielectric layer; 134. Passivation layer; 104. Active layer; 106. Gate; 110. Source; 111. Drain; 133. Second adapter electrode; 112, First electrode; 114a, Light-emitting part; 115, Second electrode; 130, First electrode plate; 131, Second electrode plate; 5, Touch blind zone; 41, Touch electrode; 42, Touch signal line; S1, First side; S2, Second side; S3, Third side; S4, Fourth side; 401, First touch unit; 402, Second touch unit; 51, First multiplexing unit; 52, Second multiplexing unit; 61, First touch unit group; 62, Second touch unit group; 112a, First conductive layer; 115a, Second conductive layer; 133a, First adapter electrode; 80, Control lead; 70, Control signal line; 71, Ground lead; 72, First control signal line; 73, Second control signal line. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0036] As used herein, “parallel” and “perpendicular” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°.

[0037] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0038] In this article, "electrical connection" includes the situation where constituent elements are connected together by a component that has a certain electrical function. There are no particular restrictions on the "component that has a certain electrical function" as long as it enables the transmission and reception of electrical signals between the connected constituent elements. Examples of "components that have a certain electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components with various functions.

[0039] In this document, a transistor is defined as a device that includes at least three terminals: a gate, a source, and a drain. A transistor has a channel region between the drain (drain terminal, drain region, or drain electrode) and the source (source terminal, source region, or source electrode), and current can flow through the drain, the channel region, and the source.

[0040] In this specification, the first terminal can be the drain and the second terminal can be the source, or vice versa. In cases where transistors with opposite polarities are used or the current direction changes during circuit operation, the functions of the "source" and "drain" are sometimes interchanged. Therefore, in this specification, the "source" and "drain" can be interchanged.

[0041] This document describes exemplary embodiments with reference to sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Therefore, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0042] Capacitive touchscreens include self-capacitive touchscreens and mutual-capacitive touchscreens. In self-capacitive touchscreens, the touch structure typically uses self-capacitive electrodes. These self-capacitive electrodes and the ground electrode form a capacitor; that is, the self-capacitive electrode itself has capacitance to ground. The principle of a self-capacitive touchscreen is that when a user's finger touches the screen, the capacitance of the finger is added to the capacitance of the self-capacitive electrode itself, thus increasing the capacitance. Therefore, during touch detection, when the user's finger touches the screen, it causes a change in the capacitance of the self-capacitive electrode at the touch point. By detecting this change in capacitance, the coordinates of the touch point can be determined.

[0043] Flexible touch displays typically include Flexible Single Layer On Cell (FSLOC) touch displays and Flexible Multi-Layer On Cell (FMLOC) touch displays. FSLOC touchscreens feature a single-layer touch structure, meaning their touch electrodes are single-layer self-capacitive electrodes. Therefore, compared to FMLOC touchscreens, FSLOC touchscreens perform better in low-thickness inkjet printing. Furthermore, due to their single-layer nature, fewer masks are required during FSLOC fabrication, resulting in lower touch costs. Additionally, due to the self-capacitance principle, the electrode area per channel is smaller, leading to lower capacitive load and avoiding poor grounding quality issues, making them more suitable for medium to large-sized and foldable screen products.

[0044] Figure 1 This is a planar schematic diagram of a touch display substrate in related technologies. Figure 2 yes Figure 1 The diagram shows the structure of the touch display substrate along its thickness direction. (Refer to...) Figure 1 The touch display substrate can be divided into a display (Active Area, AA) area and a peripheral area (Border Area, BA) area surrounding the display area. (See reference...) Figure 2 The touch display substrate typically includes a substrate 11 along its thickness direction, a display layer 12 disposed on the substrate 11, and a touch layer 13 located on the side of the display layer 12 facing away from the substrate 11. The display layer 12 includes a plurality of pixel units 300 located on the substrate 11. Each pixel unit 300 includes a pixel driving circuit 12a and a light-emitting device 12b connected to the pixel driving circuit 12a. Typically, each pixel unit 300 includes a plurality of sub-pixels, for example... Figure 2 The middle pixel unit 300 includes three sub-pixels: red, green, and blue.

[0045] Figure 3 This is a schematic diagram of the specific film structure of display layer 12. (See attached diagram.) Figure 3As shown, the substrate 11 can be a two-layer structure, for example, it can include a polyimide (PI) layer 101 and a buffer layer 102 stacked sequentially. The buffer layer 102 can be made of materials such as silicon oxide and silicon nitride to achieve the effects of blocking water and oxygen and blocking alkaline ions. A pixel driving circuit 12a can be formed on the substrate 11. This pixel driving circuit 12a can include an interlayer dielectric layer 103 located in the display area, which is made of inorganic materials such as silicon oxide and silicon nitride. The pixel driving circuit 12a also includes thin-film transistors and capacitor structures located in the display area, such as... Figure 3 As shown, the thin-film transistor can be a top-gate type, including an active layer 104, a first gate insulating layer 105, a gate 106, a second gate insulating layer 108, an interlayer dielectric layer 103, a source 110, and a drain 111; the capacitor structure can include a first electrode 130 and a second electrode 131. The first electrode 130 is disposed on the same layer as the gate 103, and the second electrode 131 is located between the second gate insulating layer 105 and the interlayer dielectric layer 103, and is disposed opposite to the first electrode 130. The light-emitting device 12b may include a first electrode 112 and a pixel defining portion 113 sequentially formed on the interlayer dielectric layer 103. The portion of the pixel defining portion 113 located in the display area has a pixel opening that exposes the first electrode 112. It is understood that the light-emitting device 12b also includes a light-emitting portion 114a and a second electrode 115. The light-emitting portion 114a is located in the pixel opening and formed on the first electrode 112. The second electrode 115 covers the light-emitting portion 114a, and the polarity of the second electrode 115 is opposite to that of the first electrode 112. For example, the first electrode 112 may be an anode and the second electrode 115 may be a cathode.

[0046] Additionally, before fabricating the light-emitting device 12b, a planarization layer (PLN) 116 can be fabricated, which is formed between the interlayer dielectric layer 103 and the first electrode 112. For example... Figure 3 As shown, the first electrode 112 can also be electrically connected to the drain electrode 111 via the second transfer electrode 133. When the first electrode 112 is electrically connected to the drain electrode 111 via the second transfer electrode 133, the planarization portion 116 can be a double-layer structure, specifically including a first planarization layer (PLN1) 116a and a second planarization layer (PLN2) 116b formed sequentially.

[0047] Figure 4 This is a planar schematic diagram of a touch layer in related technologies, which can be applied to common FSLOC touchscreens. For example... Figure 4As shown, the touch layer 13 includes multiple arrayed touch electrodes 41 and multiple touch signal lines 42 connected one-to-one with each touch electrode 41. The touch electrodes 41 can be self-capacitive electrodes. Each touch electrode 41 is connected to the touch driver chip (TIC) located in the peripheral area via a corresponding touch signal line 42; that is, the touch signal lines 42 extend from the display area to the peripheral area. However, as the size of the touchscreen increases, the number of touch electrodes 41 increases dramatically, and correspondingly, the number of touch signal lines 42 also increases. A large number of touch signal lines 42 requires a large wiring area, resulting in increased spacing between adjacent rows of touch electrodes 41. The wiring area of ​​the touch signal lines 42 is often referred to as the touch blind zone 5. In other words, as the size of the touch screen increases, the area of ​​the touch blind zone 5 also increases. The more touch blind zones 5 there are, the lower the touch sensitivity of the touch screen. In addition, the touch signal line 42 extends from the display area to the peripheral area and connects to the touch driver chip TIC. As the number of touch signal lines 42 increases, the wiring in the peripheral area becomes more complicated, which is not conducive to the wiring design of the bezel area.

[0048] It should be noted that, unless otherwise specified, the first direction or X direction mentioned in this article refers to the direction of the row, the second direction or Y direction refers to the direction of the column, and the Z direction refers to the direction of the thickness.

[0049] To address at least one of the aforementioned technical problems, in one aspect, embodiments of this disclosure provide a touch display substrate having a display area and a peripheral area located around the display area (refer to...). Figure 1 The touch display substrate provided in this disclosure includes a substrate 11, a display layer 12 disposed on the substrate 11, and a touch layer 13 located on the side of the display layer 12 facing away from the substrate 11 (see reference). Figure 2 The touch layer 13 includes a plurality of touch electrodes 41 and a plurality of touch signal lines 42 connected one-to-one with the plurality of touch electrodes 41. The plurality of touch electrodes 41 are located in the display area, and the plurality of touch signal lines extend from the display area to the peripheral area. The touch display substrate provided in this disclosure also includes a plurality of multiplexers located in the peripheral area. The plurality of touch electrodes 41 are divided into multiple groups arranged side-by-side along a second direction. The touch electrodes 41 in each group are arranged side-by-side along a first direction, and the touch electrodes 41 in each group are divided into a plurality of touch units. At least some of the multiple touch units located in the same group are connected to multiplexers located on different sides of the display area.

[0050] The touch display substrate provided in this disclosure divides the multiple touch electrodes 41 of the touch layer 13 into multiple groups along the second direction, and divides each group of touch electrodes 41 into multiple touch units. At least some of the multiple touch units are connected to multiplexers located on different sides of the display area. This can achieve at least the following beneficial effects: by connecting the multiple touch units in a group to multiplexers located on different sides of the display area, the area of ​​the wiring region of the touch signal lines 42 connected to the group of touch electrodes 41 can be effectively reduced. In this case, on the one hand, the proportion of the touch blind zone 5 can be reduced, and on the other hand, the number of touch electrodes 41 can be increased without changing the size of the touch electrodes 41. This can effectively improve the touch sensitivity and accuracy of the touch display substrate, which is beneficial to the large size of the touch screen.

[0051] The specific implementation examples are described below.

[0052] Figure 5 This is a planar schematic diagram of a touch layer provided in an embodiment of this disclosure. Figure 5 As shown, in this embodiment, the second direction / Y direction refers to the direction of the column, and the first direction / X direction refers to the direction of the row. Multiple touch electrodes 41 are divided into M groups arranged side-by-side along the Y direction, each group including N touch electrodes 41. The N touch electrodes 41 in one group are arranged side-by-side along the X direction; in other words, the multiple touch electrodes 41 are arranged in M ​​rows and N columns. The display area has a first side S1 and a second side S2 arranged opposite each other along the Y direction. In this case, the touch electrodes 41 in each group are divided into two touch units. The two touch units pointing from the first side S1 to the second side S2 are the first touch unit 401 and the second touch unit 402, respectively.

[0053] Figure 6 A schematic diagram showing a set of touch electrodes divided into two touch units, as shown below. Figure 6 As shown, the i-th group (or i-th row) of touch electrodes 41 includes N touch electrodes 41 arranged side by side along the X direction. In this embodiment, these N touch electrodes 41 are divided into two touch units, namely the first touch unit 401 and the second touch unit 402. Meanwhile, multiple multiplexers include a first multiplexer 501 located on the first side S1 of the display area and a second multiplexer 502 located on the second side S2 of the display area. Each touch electrode 41 in the first touch unit 401 is connected to the first multiplexer 501 via a touch signal line 42, and each touch electrode 42 in the second touch unit 402 is connected to the second multiplexer 502 via a touch signal line 42.

[0054] from Figure 6As can be seen from the embodiments provided in this disclosure, the area of ​​the touch blind zone 5 should depend on the one with a larger number of touch electrodes 41 in the two touch units. That is, the area occupied by the touch signal line 42 corresponding to the one with a larger number of touch electrodes in the two touch units is the area of ​​the touch blind zone 5 in the embodiments provided in this disclosure. The touch layer 13 provided in related technologies (e.g., Figure 4 As shown, the area of ​​the touch blind zone 5 is equal to the wiring area occupied by the touch signal lines 42 corresponding to all touch electrodes 41 in a set of touch electrodes. Obviously, compared with the related technologies, the embodiments provided in this disclosure can effectively reduce the wiring area of ​​the touch signal lines 42, that is, can effectively reduce the proportion of the touch blind zone 5.

[0055] Furthermore, in a preferred embodiment, the difference between the number of touch electrodes 41 in the first touch unit 401 and the number of touch electrodes 41 in the second touch unit 402 is no greater than 1. For example, when the number N of a set of touch electrodes 41 is even, the number of touch electrodes 41 in both the first touch unit 401 and the second touch unit 402 is N / 2; when the number N of a set of touch electrodes 41 is odd, one of the two touch units (e.g., the first touch unit 401) has a number of touch electrodes 41 of N / 2. The number of touch electrodes 41 in the other (e.g., the second touch unit 402) is The beneficial effects of this setup are: it can maximize the compression of the wiring area occupied by the touch signal line 42 corresponding to a set of touch electrodes 41, thereby maximizing the compression of the proportion of the touch blind zone 5 and improving the touch sensitivity and accuracy of the touch screen.

[0056] Furthermore, in some examples, both the first multiplexer 501 and the second multiplexer 502 include a plurality of first multiplexing units 51. Figure 7 The diagram shown illustrates a first multiplexer 501 comprising multiple first multiplexing units 51. Figure 7 As shown, in this example, both the first multiplexer 501 and the second multiplexer 502 include multiple first multiplexing units 51; M first touch units 401 are divided into multiple first touch unit groups 61 arranged side by side along the Y direction, and one first touch unit group 61 is connected to one of the first multiplexing units 51 in the first multiplexer 501; M second touch units 402 are divided into multiple second touch unit groups 62 arranged side by side along the Y direction, and one second touch unit group 62 is connected to one of the first multiplexing units 51 in the second multiplexer 502.

[0057] In the above example, both the first multiplexer 501 and the second multiplexer 502 include multiple first multiplexing units 51. Connecting the touch electrode 41 in a first touch unit group 61 to a first multiplexing unit 51 of the first multiplexer 501, and connecting the touch electrode 41 in a second touch unit group 62 to a first multiplexing unit 51 of the second multiplexer 502, can produce the following beneficial effects: splitting the first multiplexer 501 and the second multiplexer 502 into multiple first multiplexing units 51 can reduce the hardware complexity and fabrication complexity of the first multiplexer 501 and the second multiplexer 502. On the other hand, each first multiplexing unit 51 can be optimized and independently designed according to requirements, improving the flexibility and scalability of the device. Furthermore, each first multiplexing unit 51 is independent of each other, facilitating individual maintenance and upgrades in case of failure, reducing maintenance costs and failure risks.

[0058] Additionally, as a preferred embodiment, refer to Figure 7 In the first multiplexer 501, multiple first multiplexing units 51 are arranged side by side along the Y direction. Similarly, in the second multiplexer 502, multiple first multiplexing units 51 are also arranged side by side along the Y direction. This arrangement helps to reduce the bezel area occupied by the multiple first multiplexing units 51, which is beneficial for achieving a narrower bezel on the touchscreen.

[0059] In other examples, both the first multiplexer 501 and the second multiplexer 502 include a second multiplexing unit 52 and a plurality of first multiplexing units 51 connected to the second multiplexing unit 52. Figure 9 A schematic diagram showing a first multiplexer 501 including a second multiplexing unit 52 and a plurality of first multiplexing units 51 connected to the second multiplexing unit 52, as shown below. Figure 9 As shown, in this example, both the first multiplexer 501 and the second multiplexer 502 include a second multiplexing unit 52 and a plurality of first multiplexing units 51 connected to the second multiplexing unit 52; the M first touch units 401 are divided into a plurality of first touch unit groups 61 arranged side by side along the Y direction, and one first touch unit group 61 is connected to one of the first multiplexing units 51 in the first multiplexer 501; the M second touch units 402 are divided into a plurality of second touch unit groups 62 arranged side by side along the Y direction, and one second touch unit group 62 is connected to one of the first multiplexing units 51 in the second multiplexer 502.

[0060] In the above example, both the first multiplexer 501 and the second multiplexer 502 include a second multiplexing unit 52 and a plurality of first multiplexing units 51 connected to the second multiplexing unit 52. A touch electrode 41 in a first touch unit group 61 is connected to a first multiplexing unit 51 of the first multiplexer 501, and a touch electrode 41 in a second touch unit group 62 is connected to a first multiplexing unit 51 of the second multiplexer 502. This example, in addition to achieving… Figure 7 In addition to the beneficial effects of the example shown, the following beneficial effects can also be achieved: by splitting the first multiplexer 501 and the second multiplexer 502 into two stages, the first stage includes a second multiplexing unit 52 and the second stage includes multiple first multiplexing units 51, on the one hand, the complex signal processing process can be decomposed into two simpler stages, reducing the complexity and load of the single-stage multiplexer and improving the stability of the device; on the other hand, the two-stage multiplexing unit can improve the flexibility of layout and expansion, making it easier to add signal channels according to actual needs, thereby expanding the applicable scenarios of the product.

[0061] Furthermore, as a preferred embodiment, refer to Figure 8 In the first multiplexer 501, the second multiplexing unit 52 and the plurality of first multiplexing units 51 are arranged side by side along the Y direction. Similarly, in the second multiplexer 502, the second multiplexing unit 52 and the plurality of first multiplexing units 51 are also arranged side by side along the Y direction. This arrangement helps to reduce the bezel area occupied by the second multiplexing unit 52 and the plurality of first multiplexing units 51, which is beneficial to the narrow bezel design of the touchscreen.

[0062] In some other examples, both the first multiplexer 501 and the second multiplexer 502 include a plurality of second multiplexing units 52 and a plurality of first multiplexing units 51 respectively connected to each of the second multiplexing units 52. Figure 11 A schematic diagram of a first / second multiplexer including multiple second multiplexing units 52 and multiple first multiplexing units 51, as shown below. Figure 11 As shown, in this example, both the first multiplexer 501 and the second multiplexer 502 include multiple second multiplexing units 52 and multiple first multiplexing units 51 respectively connected to each of the second multiplexing units 52; the M first touch units 401 are divided into multiple first touch unit groups 61 arranged side by side along the Y direction, and one first touch unit group 61 is connected to one of the first multiplexing units 51 in the first multiplexer 501; the M second touch units 402 are divided into multiple second touch unit groups 62 arranged side by side along the Y direction, and one second touch unit group 62 is connected to one of the first multiplexing units 51 in the second multiplexer 502.

[0063] In the above example, both the first multiplexer 501 and the second multiplexer 502 include multiple second multiplexing units 52 and multiple first multiplexing units 51 respectively connected to each of the second multiplexing units 52. A touch electrode 41 in a first touch unit group 61 is connected to a first multiplexing unit 51 of the first multiplexer 501, and a touch electrode 41 in a second touch unit group 62 is connected to a first multiplexing unit 51 of the second multiplexer. This example, in addition to achieving… Figure 7 and Figure 8 In addition to the beneficial effects of the example shown, the following beneficial effects can also be achieved: on the one hand, it can further decompose the complex signal processing process, thereby reducing the complexity and load of the single-stage multiplexer and improving the stability of the device; on the other hand, this example, compared to... Figure 7 and Figure 8 In the example shown, the wiring area of ​​the multiplexer in the peripheral area can be reduced, which helps to achieve a narrow bezel.

[0064] Furthermore, as a preferred embodiment, refer to Figure 11 In the first multiplexer 501, multiple second multiplexing units 52 and multiple first multiplexing units 51 are arranged side-by-side along the Y direction. Similarly, in the second multiplexer 502, multiple second multiplexing units 52 and multiple first multiplexing units 51 are also arranged side-by-side along the Y direction. This arrangement helps to reduce the bezel area occupied by the multiple second multiplexing units 52 and multiple first multiplexing units 51, which is beneficial for achieving a narrower bezel on the touchscreen.

[0065] Those skilled in the art will understand that the touch display substrate provided in this disclosure also includes a touch driver chip (TIC) located in the peripheral area, and multiple multiplexers are connected to the touch driver chip (TIC). Specifically, in Figure 7 In the example shown, multiple first multiplexing units 51 of the first multiplexer 501 and the second multiplexer 502 are connected to the touch driver chip TIC. Figure 8 In the example shown, the second multiplexing unit 52 in the first multiplexer 501 and the second multiplexer 502 is connected to the touch driver chip TIC. Figure 12 In the example shown, multiple second multiplexing units 52 in the first multiplexer 501 and the second multiplexer 502 are all connected to the touch driver chip TIC.

[0066] The following uses data to illustrate the effectiveness of the technical solution provided in reducing touch blind spots. For a 12.3-inch touchscreen (its length W1 along the X direction is 109.728mm, and its length L1 along the Y direction is 292.608mm), when the size of each touch electrode 41 is 5.5mm × 6.16mm (where 5.5mm is the length W2 along the X direction of the touch electrode 41, and 6.16mm is the length L2 along the Y direction of the touch electrode 41), the touch layer 13 can accommodate approximately 48 × 20 touch electrodes 41, i.e., 48 rows and 20 columns. For this type of touchscreen, if the pixel pitch in its display layer 12 is 152.4μm and each pixel pitch can accommodate two touch signal lines 42, when using the touch layer 13 in related technologies (e.g., Figure 4 When the touch layer 13 is shown, the touch blind area 5 of the touch screen occupies an area of ​​the entire touch layer 13 that is greater than R. B It should be calculated according to the following formula: That is, the touch blind zone 5 occupies 66.5% of the entire touch layer 13, which is much greater than the requirement in the art that the proportion of the touch blind zone 5 of a touch screen should be less than 35%. However, when the touch layer 13 provided in the embodiments of this disclosure is used, that is, for each row of 20 touch electrodes 41, they can be divided into two touch units, each touch unit including 10 touch electrodes 41. In other words, the 48 rows and 20 columns of touch electrodes 41 are divided into 48 first touch units 401 and 48 second touch units 402. Both the first multiplexer 501 and the second multiplexer 502 may include one second multiplexing unit 52 and four first multiplexing units 51. The 48 first touch units 401 are divided into four first touch unit groups 61, each group comprising 12 first touch units 401. The touch electrode 41 in one first touch unit group 61 is connected to one first multiplexing unit 51 of the first multiplexer 501. Similarly, the 48 second touch units 402 are divided into four second touch unit groups 62, each group comprising 12 second touch units 401. The touch electrode 41 in one second touch unit group 62 is connected to one first multiplexing unit 51 of the second multiplexer 503. Simultaneously, the second multiplexing unit 52 is connected to the touch driver chip (TIC).

[0067] For a 12.3-inch touchscreen, when using the touch layer 13 provided in this disclosure, the touch blind area 5 occupies a certain percentage (R) of the total area of ​​the touch layer 13. B It should be calculated according to the following formula: When the touch layer 13 in the related technology is used, the proportion of touch blind zone 5 of the touch screen is as high as 66.5%. However, when the touch layer 13 provided in this disclosure is used, the proportion of touch blind zone 5 of the touch screen can be reduced to 12.37%. It can be seen that the touch layer 13 provided in this disclosure can effectively reduce the proportion of touch blind zone 5, thereby effectively improving the touch sensitivity and accuracy of the touch screen.

[0068] Based on the same inventive concept. Figure 10 This is a schematic planar view of another touch layer provided in an embodiment of this disclosure. In this embodiment, the second direction / Y direction still refers to the direction where the column is located, and the first direction / X direction still refers to the direction where the row is located. However, compared with... Figure 5 Unlike the illustrated embodiment, in this embodiment, the multiple touch electrodes 41 are divided into J groups (i.e., J columns) arranged side-by-side along the X direction. Each group includes I touch electrodes 41, and the I touch electrodes 41 in one group are arranged side-by-side along the Y direction. In other words, the multiple touch electrodes 41 are arranged in I rows and J columns. Correspondingly, the display area has a third side S3 and a fourth side S4 arranged opposite to each other along the X direction. The first multiplexer 501 is located on the third side S3, and the second multiplexer 502 is located on the fourth side S4. Both the first multiplexer 501 and the second multiplexer 502 include multiple first multiplexing units 51. At this time, the touch electrodes 41 in each group are divided into two touch units. The two touch units pointing from the third side S3 to the fourth side S4 are the first touch unit 401 and the second touch unit 402, respectively.

[0069] Continue to refer to Figure 10 J first touch units 401 are divided into multiple first touch unit groups 61 arranged side by side along the X direction, and one first touch unit group 61 is connected to one first multiplexing unit 51 in the first multiplexer 501; J second touch units 402 are divided into multiple second touch unit groups 62 arranged side by side along the Y direction, and one second touch unit group 62 is connected to one first multiplexing unit 51 in the second multiplexer 502.

[0070] In the above embodiment, by dividing the touch electrodes 41 in the same column into two touch units, and connecting the touch electrodes 41 in different touch units to multiplexers located on different sides, the wiring area of ​​the touch signal line 42 can be effectively reduced. That is, the proportion of the touch blind zone 5 can be effectively reduced, thereby improving the touch sensitivity and accuracy of the touch screen.

[0071] In a preferred embodiment, the plurality of first multiplexing units 51 located on the third side S3 are arranged side by side along the X direction, and the plurality of first multiplexing units 51 located on the fourth side S4 are arranged side by side along the X direction. This arrangement can reduce the area occupied by the multiplexer in the peripheral area, which is conducive to the narrow bezel design of the touch screen.

[0072] In some examples, refer to Figure 2 The display layer 12 includes a plurality of pixel units 300 located on the substrate 11. Each pixel unit 300 includes a pixel driving circuit 12a and a light-emitting device 12b connected to the pixel driving circuit 12a.

[0073] Specifically, refer to Figure 3 The pixel driving circuit 12a includes a second thin-film transistor and a capacitor structure. Commonly, the pixel driving circuit 12a can be a 3T1C, 4T1C, 5T1C, 5T2C, 6T1C, 7T1C or 8T1C circuit structure, and this disclosure does not limit it.

[0074] The second thin-film transistor can be a top-gate type, including an active layer 104, a first gate insulating layer 105, a gate 106, a second gate insulating layer 108, an interlayer dielectric layer 103, a source 110, and a drain 111. Specifically, the active layer 104 can be formed on the buffer layer 102, the first gate insulating layer 105 covers the buffer layer 102 and the active layer 104, the gate 106 is formed on the side of the first gate insulating layer 105 away from the active layer 104, the second gate insulating layer 108 covers the gate 106 and the first gate insulating layer 105, the interlayer dielectric layer 103 covers the second gate insulating layer 108, the source 110 and the drain 111 are formed on the side of the interlayer dielectric layer 103 away from the substrate and are located on opposite sides of the gate 106, respectively. The source 110 and the drain 111 can contact the opposite sides of the active layer 104 through vias (e.g., metal vias). It should be understood that this second thin-film transistor can also be a bottom-gate type.

[0075] The capacitor structure may include a first electrode 130 and a second electrode 131. The first electrode 130 is disposed on the same layer as the gate 103, and the second electrode 131 is located between the second gate insulating layer 105 and the interlayer dielectric layer 103, and is disposed opposite to the first electrode 130. For example, the materials of the gate 103, the first electrode 130, and the second electrode 131 may include metallic or alloy materials, such as molybdenum, aluminum, and titanium. The source 110 and the drain 111 may include metallic or alloy materials, such as a single-layer or multi-layer metal structure formed of molybdenum, aluminum, and titanium. For example, the multi-layer structure is a multi-metal stack, such as a titanium, aluminum, and titanium three-layer metal stack (Ti / Al / Ti).

[0076] Preferably, the multiplexer provided in this disclosure has its film layers disposed on the same layer as the film layers of the pixel driving circuit 12a, and the materials are the same. For example, the multiplexer includes a first thin-film transistor, the structure of which is the same as the structure of the second thin-film transistor of the pixel driving circuit 12a, and the film layers of the first thin-film transistor can be disposed on the same layer as the film layers of the second thin-film transistor, and the materials are the same.

[0077] Continue to refer to Figure 3 The light-emitting device 12b includes a first electrode 112 and a pixel defining portion 113 disposed along a direction away from the substrate 11, as well as a light-emitting portion 114a and a second electrode 115. Typically, a planarization layer 116 needs to be fabricated before the light-emitting device 12b is formed. The planarization layer 116 can be a double-layer structure, specifically including a first planarization layer 116a and a second planarization layer 116b formed sequentially. The first electrode 112 can be electrically connected to the drain 111 via the second transfer electrode 133. The first electrode 112 can be an anode, which can be made of materials such as ITO (indium tin oxide), indium zinc oxide (IZO), and zinc oxide (ZnO). The pixel defining portion 113 can be formed on the planarization layer 116. This pixel defining portion 113 can be made of organic materials, such as photoresist, and the portion of the pixel defining portion 113 located in the display area can have a pixel opening that exposes the first electrode 112. The light-emitting portion 114a is located inside the pixel opening and formed on the first electrode 112. The light-emitting portion 114a may include... Small molecule organic materials or polymeric organic materials can be fluorescent or phosphorescent materials, emitting red, green, blue, or white light, etc.; and, depending on different actual needs, in different examples, the light-emitting part 114a can further include functional layers such as an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer; the second electrode 115 covers the light-emitting part 114a, and the polarity of the second electrode 115 is opposite to that of the first electrode 112; this second electrode 115 can be a cathode, which can be made of metallic materials such as lithium (Li), aluminum (Al), magnesium (Mg), and silver (Ag).

[0078] In some examples, the first electrodes 112 of each sub-pixel are independent of each other, and the second electrodes 115 of each sub-pixel are connected across the entire surface. That is, the second electrode 115 is a full-surface structure disposed in the display layer 12 and is configured as the common electrode of multiple light-emitting devices 12b.

[0079] Furthermore, the display layer 12 also includes an encapsulation layer 118 formed on the side of the light-emitting device 12b facing away from the substrate 11. For example, see reference... Figure 3The encapsulation layer 118 may include a first inorganic encapsulation layer 118a, an organic encapsulation layer 118b, and a second inorganic encapsulation layer 118c, which are stacked sequentially. The first inorganic encapsulation layer 118a and the second inorganic encapsulation layer 118c may be made of inorganic materials such as silicon nitride and silicon oxide. The organic encapsulation layer 118b is used for planarization to facilitate the fabrication of the second inorganic encapsulation layer 118c, and this organic encapsulation layer 118b may be made of materials such as acrylic polymers and silicon polymers. Furthermore, the first inorganic encapsulation layer 118a and the second inorganic encapsulation layer 118c may be fabricated using chemical vapor deposition (CVD), but are not limited to this; physical vapor deposition (PVD) may also be used. The organic encapsulation layer 118b may be fabricated using inkjet printing (IJP), but is not limited to this; spraying may also be used.

[0080] Reference Figure 2 The touch layer 13 is formed on the side of the encapsulation layer 118 facing away from the substrate 11, and may include a barrier layer 21, a touch electrode layer 22, and a touch adhesive layer 23. Multiple touch electrodes 41 are located in the touch electrode layer 22, and touch signal lines 42 are also located in the touch electrode layer 22 and formed simultaneously with the touch electrodes 41. In some examples, the touch signal lines 42 in the touch layer 13 at least partially overlap with the orthographic projection of the second electrode 115 on the substrate 11; preferably, the orthographic projection of the touch signal lines 42 on the substrate 11 lies within the orthographic projection of the second electrode 115 on the substrate 11. In this case, the second electrode 115, formed over its entire surface, creates an electric field shielding region for the touch signal lines 42, which can prevent other signals from interfering with the touch signal.

[0081] Figure 9 This is a schematic diagram of the film layer structure in the peripheral region of the touch display substrate provided in this disclosure. Figure 9As shown, a multiplexer is formed on the peripheral substrate 11. The multiplexer includes a first thin-film transistor, which is disposed on the same layer and made of the same material as the second thin-film transistor in the pixel driving circuit 12a of the display area. A planarization layer 116 is formed on the side of the multiplexer away from the substrate 11. The planarization layer 116 has a double-layer structure, including a first planarization layer 116a and a second planarization layer 116b. A first conductive layer 112a and a second conductive layer 115a are formed on the side of the planarization layer 116 away from the substrate 11. An encapsulation layer 118 is formed on the side of the second conductive layer 115a away from the substrate 11. A touch layer 13 is formed on the side of the encapsulation layer 118 away from the substrate 11, specifically including a barrier layer 21 formed on the side of the encapsulation layer 118 away from the substrate 11, a touch electrode layer 22 formed on the side of the barrier layer 21 away from the substrate 11, and a touch adhesive layer 23. The touch signal line 42 is located in the touch electrode layer 22. The touch signal line 42 is connected to the second conductive layer 115a through a conductive via (e.g., a metal via). The second conductive layer 115a and the first conductive layer 112a are stacked. The first conductive layer 112a is connected to the drain of the first thin film transistor in the multiplexer through the first transition electrode 133a. In other words, the touch signal line 42 is connected to the drain of the first thin film transistor through the first transition electrode 133a.

[0082] Preferably, the first conductive layer 112a and the first electrode 112 of the display area are disposed in the same layer and made of the same material; the second conductive layer 115a and the second electrode 115 of the display area are disposed in the same layer and made of the same material; the first transition electrode 133a and the second transition electrode 133 of the display area are disposed in the same layer and made of the same material. This arrangement simplifies the manufacturing process and reduces manufacturing costs. In addition, preferably, the orthographic projection of the conductive vias on the barrier layer 21 onto the substrate does not overlap with the orthographic projection of the encapsulation layer 118 onto the substrate. That is, the conductive vias are formed in areas not covered by the encapsulation layer 118. This arrangement avoids the problem of high difficulty in forming conductive vias due to the excessive thickness of the encapsulation layer 118.

[0083] Those skilled in the art will understand that both the first multiplexing unit 51 and the second multiplexing unit 52 provided in this disclosure have multiple output terminals, a single input terminal, and multiple control terminals. For example, a 4:1 multiplexing unit has four output terminals, one input terminal, and two control terminals. For the touch display substrate provided in this disclosure, the control terminals of both the first multiplexing unit 51 and the second multiplexing unit 52 are connected to the control signal line 70, thereby connecting to the control pins of the touch driver chip TIC. Figure 12 The wiring layout of the control terminals of the first and second multiplexing units is as follows: Figure 12As shown, some control terminals of the first multiplexer unit 51 and the second multiplexer unit 52 can share the control signal line 70. For example, the ground terminals of the first multiplexer unit 51 and the second multiplexer unit 52 can share the same ground lead 71. Figure 12 The first multiplexing unit 51 is connected to the control pin of the touch driver chip TIC via the first control signal line 72, and the second multiplexing unit 52 is connected to the control pin of the touch driver chip TIC via the second control signal line 73. In the above example, some control terminals of the first multiplexing unit 51 and the second multiplexing unit 52 share the same control signal line 70, which can reduce the number and area of ​​control signal lines in the bezel area, thereby contributing to narrow bezels.

[0084] For ease of explanation, the connection line between the control terminals of the first multiplexing unit 51 and the second multiplexing unit 52 and the control signal line 70 of the touch driver chip TIC will be referred to as the control lead 80.

[0085] When the structure of touch layer 13 is Figure 8 or Figure 11 As shown, the control leads 80 of the first multiplexing unit 51 and the second multiplexing unit 52 can be disposed on the same layer as the gate 103 of the second thin-film transistor. For example... Figure 9 As shown, the touch signal is transmitted to the drain of the first thin-film transistor (TFT) through the first transfer electrode 133a. The drains of the first TFT and the second TFT 111 are disposed on the same layer. That is, the input and output signals of the first multiplexer 501 or the second multiplexer 502 are transmitted in the layer where the drain 111 is located. The control lead 80 of the first multiplexer 501 or the second multiplexer 502 is disposed in the layer where the gate 103 is located. Therefore, the control signal of the first multiplexer 501 or the second multiplexer 502 is transmitted in the layer where the gate 103 is located. In this way, mutual interference between the touch signal and the control signal can be avoided, which would affect the accuracy and stability of the touch display substrate.

[0086] Those skilled in the art will understand that, in some examples, the display layer 12 also includes data signal lines and scan signal lines located in the display area connected to the pixel driving circuit 12a, as well as a timing controller (TCON), a data driving circuit S-IC, and a scan driving circuit G-IC located in the peripheral area, and typically the scan driving circuit G-IC is disposed on the same layer as the pixel driving circuit 12a (and the multiplexer). When the structure of the touch layer 13 is... Figure 10 As shown, the transmission path of the input and output signals of the multiplexer in its peripheral area is similar to... Figure 8 or Figure 11 The touch display substrate is slightly different. Specifically, the path of the touch signal located on the third side S3 is as follows: Figure 13 As shown, the touch signal line 42 is located on the touch electrode layer 22, and is connected to the drain of the first thin-film transistor in the first multiplexing unit 51 via the first transition electrode 133a located on the planarization layer 116. It can be understood that the drain of the first thin-film transistor here corresponds to the output terminal of the multiplexing unit. Figure 8 or Figure 11 In the touch display substrate shown, when the touch signal is transmitted to the touch driver chip via the input terminal, its transmission layer is still located on the source and drain layer of the second thin-film transistor, that is, on the same layer as the scan driving circuit G-IC. Figure 9 (Not shown in the image). However, in Figure 10 In the touch display substrate shown, the transmission path of the touch signal is as follows: Figure 13 As shown, when the touch signal is transmitted to the touch driver chip via the input terminal, it is first transmitted to the touch electrode layer 22, and then transmitted in the touch electrode layer 22 to the touch driver chip TIC located on the fourth side S4 of the display substrate. At this time, the touch signal is transmitted to the touch driver chip TIC through the touch electrode layer 22, which is located on a different layer from the scan driver circuit G-IC. The beneficial effect of this is that it avoids increasing the number of signal lines and the wiring area of ​​the scan driver circuit G-IC layer, thereby avoiding expanding the bezel area on the left and right sides of the display device and helping to achieve a narrow bezel.

[0087] In some examples, refer to Figure 3 A support portion 132 may be provided on the side of the pixel defining portion 113 facing away from the substrate 11. This support portion 132 can support the protective film layer (not shown in the figure) to prevent the protective film layer from contacting the first electrode 112 or other traces, which could easily damage the first electrode 112 or other traces. It should be noted that this protective film layer mainly appears during the transfer of semi-finished products to prevent damage to the semi-finished products during the transfer process. Specifically, when transferring the substrate with the support portion 132 to the evaporation line, a protective film layer can be applied. When the evaporation of the light-emitting material is required, the protective film layer is removed.

[0088] For example, the material of the support portion 132 may be the same as the material of the pixel defining portion 113, and the support portion 132 and the pixel defining portion 113 may be formed using the same patterning process. However, it is not limited to this. The material of the support portion 132 may also be different from the material of the pixel defining portion 113, and the support portion 132 and the pixel defining portion 113 may also be formed using different patterning processes.

[0089] Furthermore, the touch electrode 41 can be made of metal and its shape can be the rectangle shown in this disclosure, or it can be any one or more of triangles, trapezoids, rhombuses, pentagons, or other polygons. This disclosure does not limit this. The number of touch electrodes 41 can also be set according to the specific device size, pixel pitch, and touch accuracy.

[0090] In a second aspect, this disclosure provides a display device that includes the touch display substrate provided in the first aspect.

[0091] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A touch display substrate having a display area and a peripheral area located around the display area; the touch display substrate includes a substrate, a display layer disposed on the substrate, and a touch layer located on the side of the display layer opposite to the substrate; The touch layer includes multiple touch electrodes and multiple touch signal lines connected to each of the multiple touch electrodes; the multiple touch electrodes are located in the display area, and the multiple touch signal lines extend from the display area to the peripheral area; The touch display substrate also includes multiple multiplexers located in the peripheral area; wherein... The plurality of touch electrodes are divided into multiple groups arranged side by side along the second direction, and the touch electrodes in each group are arranged side by side along the first direction, and the touch electrodes in each group are divided into multiple touch units. At least some of the plurality of touch units located in the same group are connected to multiplexers located on different sides of the display area.

2. The touch display substrate according to claim 1, wherein, The display area has a first side and a second side that are disposed opposite to each other along the second direction; The touch electrodes in each group are divided into two touch units, and the two touch units pointing from the first side to the second side are the first touch unit and the second touch unit, respectively. The plurality of multiplexers includes a first multiplexer located on the first side and a second multiplexer located on the second side; Each of the touch electrodes in the first touch unit is connected to the first multiplexer via a touch signal line; each of the touch electrodes in the second touch unit is connected to the second multiplexer via a touch signal line.

3. The touch display substrate according to claim 2, wherein, Both the first multiplexer and the second multiplexer include multiple first multiplexing units; The plurality of first touch units are divided into a plurality of first touch unit groups arranged side by side along the second direction, and one first touch unit group is connected to one of the first multiplexer units in the first multiplexer; The plurality of second touch units are divided into a plurality of second touch unit groups arranged side by side along the second direction, and one of the second touch unit groups is connected to one of the first multiplexing units in the second multiplexer.

4. The touch display substrate according to claim 2, wherein, Both the first multiplexer and the second multiplexer include a second multiplexing unit and a plurality of first multiplexing units connected to the second multiplexing unit; The plurality of first touch units are divided into a plurality of first touch unit groups arranged side by side along the second direction, and one first touch unit group is connected to one of the first multiplexer units in the first multiplexer; The plurality of second touch units are divided into a plurality of second touch unit groups arranged side by side along the second direction, and one of the second touch unit groups is connected to one of the first multiplexing units in the second multiplexer.

5. The touch display substrate according to claim 3 or 4, wherein, The plurality of first multiplexing units in the first multiplexer are arranged side by side along the second direction; and / or, The plurality of second multiplexing units in the second multiplexer are arranged side by side along the second direction.

6. The touch display substrate according to claim 4, wherein, The second multiplexing unit and the plurality of first multiplexing units in the first multiplexer are arranged side by side along the second direction; and / or, The second multiplexing unit and the plurality of first multiplexing units in the second multiplexer are arranged side by side along the second direction.

7. The touch display substrate according to claim 2, wherein, The difference between the number of touch electrodes in the first touch unit and the number of touch electrodes in the second touch unit is no greater than 1.

8. The touch display substrate according to claim 1, wherein, It also includes a touch driver chip located in the peripheral area, and the plurality of multiplexers are all connected to the touch driver chip.

9. The touch display substrate according to claim 1, wherein, The display layer includes a plurality of pixel units located on the substrate, each pixel unit including a pixel driving circuit and a light-emitting device connected to the pixel driving circuit; the pixel driving circuit includes a second thin-film transistor, and the multiplexer includes a first thin-film transistor; The first thin-film transistor and the second thin-film transistor are disposed in the same layer and are made of the same material.

10. The touch display substrate according to claim 1, wherein, The display layer includes a plurality of pixel units located on the substrate, and each pixel unit includes a pixel driving circuit and a light-emitting device connected to the pixel driving circuit. The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode arranged sequentially along a direction away from the substrate; the touch signal line and the orthogonal projection of the second electrode on the substrate at least partially overlap.

11. The touch display substrate according to claim 10, wherein, The multiplexer includes a first thin-film transistor, and the touch signal line is disposed on the same layer as the touch electrode; the touch signal line is connected to the first electrode of the first thin-film transistor through a first adapter electrode.

12. The touch display substrate according to claim 11, wherein, The pixel driving circuit includes a second thin-film transistor; the first electrode of the light-emitting device is connected to the first electrode of the second thin-film transistor via a second transfer electrode. The first and second transfer electrodes are disposed in the same layer and are made of the same material.

13. The touch display substrate according to claim 12, wherein, The display layer further includes an encapsulation layer disposed on the side of the light-emitting device away from the substrate; the touch layer is formed on the side of the encapsulation layer away from the substrate, and includes a barrier layer, a touch electrode and a touch adhesive layer stacked sequentially along the direction away from the substrate.

14. The touch display substrate according to claim 13, wherein, The barrier layer has a conductive via extending through its thickness; the conductive via is located in the peripheral region and does not overlap with the orthographic projection of the encapsulation layer onto the substrate. The touch signal line is connected to the first adapter electrode through the conductive via.

15. A display device comprising a touch display substrate as described in any one of claims 1-14.

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