Touch display substrate and display device

Abstract

The present disclosure provides a touch display substrate and a display device, the touch display substrate having a display area and a peripheral area located outside the display area. The touch display substrate includes: a substrate, a display array layer located above the substrate, a light-emitting layer, and a touch layer. The light-emitting layer includes a plurality of pixel units located within the display area, each pixel unit including at least two sub-pixels of different colors. The touch layer includes a touch grid pattern. Each touch grid of the touch grid pattern is arranged around at least one sub-pixel. The touch grid corresponding to the sub-pixel near the peripheral area has the same shape as the touch grid corresponding to the sub-pixel of the same color in the center of the display area. The touch display substrate and display device provided by the embodiments of the present disclosure can improve edge chromatic aberration and color shift.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a touch display substrate and a display device. Background Art

[0002] With the advancement of technology, OLED (organic light-emitting diode) has become increasingly common in mobile phones due to its more realistic and richer display properties. Flexible OLEDs are particularly popular because they can bend at the edges, improving the user experience. However, curved edges can easily lead to color shifts. Therefore, achieving color uniformity at edges is a major challenge. Summary of the Invention

[0003] The embodiments of the present disclosure provide a touch display substrate and a display device, which can improve edge chromatic aberration and color shift.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] An embodiment of the present disclosure provides a touch display substrate, which has a display area and a peripheral area located outside the display area; the touch display substrate includes: a substrate, a display array layer located above the substrate, a light-emitting layer and a touch layer; the light-emitting layer includes a plurality of pixel units located within the display area, each of the pixel units including at least two sub-pixels of different colors, and the touch layer includes a touch grid pattern; each touch grid of the touch grid pattern is arranged around at least one sub-pixel; and the touch grid corresponding to the sub-pixel close to the peripheral area has the same shape as the touch grid corresponding to the sub-pixel of the same color in the center of the display area.

[0006] Exemplarily, multiple peripheral signal lines are arranged in the peripheral area, and the peripheral signal line closest to the display area among the multiple peripheral signal lines is the first peripheral signal line; the minimum spacing b between the first peripheral signal line and the sub-pixel closest to the first peripheral signal line is 30 to 40 μm.

[0007] Exemplarily, the minimum distance a between the first peripheral signal line and the touch grid closest to the first peripheral signal line is 15-25 μm.

[0008] Exemplarily, the ratio a / b of the minimum spacing a between the first peripheral signal line and the touch grid closest to the first peripheral signal line to the minimum spacing b between the first peripheral signal line and the sub-pixel light-emitting area closest to the first peripheral signal line ranges from 3 / 8 to 5 / 6.

[0009] Exemplarily, the minimum spacing b between the first peripheral signal line and the sub-pixel closest to the first peripheral signal line is 35.5 μm; the minimum spacing between the first peripheral signal line and the touch grid closest to the first peripheral signal line is 19.58 μm.

[0010] Exemplarily, the spacing between adjacent ones of the plurality of peripheral signal lines ranges from 4 to 10 μm.

[0011] Exemplarily, the line width of each peripheral signal line ranges from 3.5 to 50 μm.

[0012] Exemplarily, the light-emitting layer includes a first electrode and a second electrode that are oppositely disposed and an electroluminescent material layer located between the first electrode and the second electrode.

[0013] Exemplarily, the touch grid pattern and at least part of the first peripheral signal lines are arranged on the same layer.

[0014] The embodiments of the present disclosure further provide a display device, including the touch display substrate provided by the embodiments of the present disclosure.

[0015] The beneficial effects brought about by the embodiments of the present disclosure are as follows:

[0016] In the touch display substrate and display device provided in the embodiments of the present disclosure, the touch grid pattern of the touch layer thereof is such that, for sub-pixels of the same color, the touch grids at the edge near the peripheral area have the same shape as the touch grids in the center of the display area. For example, if the touch grid pattern for a sub-pixel of a certain color in the center of the display area is a complete grid, the touch grid corresponding to the sub-pixel of that color near the peripheral area is also a complete grid. In this way, the touch grid corresponding to the sub-pixel at the outermost edge is the same as the touch grid corresponding to the sub-pixel in the center of the display area, thereby preventing color difference and color shift issues at the outermost sub-pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing the edge of a touch grid pattern of a touch display substrate in the related art;

[0018] Figure 2 A schematic diagram showing the edge of a touch grid pattern of a touch display substrate provided by an embodiment of the present disclosure;

[0019] Figure 3 Another schematic diagram showing the edge of the touch grid pattern of the touch display substrate provided by an embodiment of the present disclosure;

[0020] Figure 4 A partial cross-sectional schematic diagram of a touch display substrate provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0022] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] Before describing in detail the touch display panel and display device provided by the embodiments of the present disclosure, it is necessary to describe the related technologies as follows:

[0024] In related technologies, OLED curved display products are increasingly being used. However, due to the presence of curved edges, color deviation and color cast occur at the edges. Therefore, achieving color uniformity at the edges is currently a major challenge.

[0025] The reasons for color cast and color difference at the edge are as follows:

[0026] For touch display products, the touch layer (TSP) is set on the substrate, and the touch grid pattern (TSPMesh) of the touch layer is arranged in the display area. Each color sub-pixel in the touch grid pattern corresponds to a touch grid, and multiple peripheral signal traces (Trace) are arranged in the peripheral area of ​​the substrate, such as peripheral display signal lines or peripheral touch signal lines.

[0027] like Figure 1As shown, in order to prevent signal short circuits and meet the requirements of narrow bezels, for the edge area, the touch grid pattern design rule is that the distance a between the touch grid 1 and the non-access area of ​​the surrounding signal lines 2 is approximately 15 to 20 μm, and the distance b between the position of the sub-pixel 3 in the display area (i.e., the pixel opening of the pixel definition layer) and the surrounding signal lines 2 is 25 to 30 μm. Due to space limitations, this design results in an incomplete touch grid shape on the sub-pixel at the outermost edge relative to the touch grid shape of the sub-pixel in the middle of the display area, resulting in differences in the touch grid shading effect above the edge sub-pixel and the middle sub-pixel, which in turn leads to color cast and color difference.

[0028] In order to solve the above problems, embodiments of the present disclosure provide a touch display substrate and a display device, which can improve edge chromatic aberration and color shift phenomena.

[0029] like Figure 2 As shown, the touch display substrate provided by the embodiment of the present disclosure has a display area A and a peripheral area B located outside the display area A.

[0030] The touch display substrate includes: a substrate 100, a display array layer, a light-emitting layer and a touch layer located on the substrate 100. In some embodiments, the display array layer, the light-emitting layer and the touch layer are arranged in sequence from a side close to the substrate 100 to a side away from the substrate 100; the light-emitting layer includes a plurality of pixel units located in the display area A, each of the pixel units includes at least two sub-pixels 200 of different colors, and the touch layer includes a touch grid pattern 300; each touch grid of the touch grid pattern 300 is arranged around at least one sub-pixel 200; and the touch grid corresponding to the sub-pixel 200 close to the peripheral area B has the same shape as the touch grid corresponding to the sub-pixel 200 of the same color in the middle of the display area A.

[0031] In the above solution, for sub-pixels 200 of the same color, the touch grid pattern 300 on the touch display substrate has the same shape as the touch grid above the sub-pixel 200 at the outermost edge and the touch grid above the sub-pixel 200 in the middle of the display area A. Therefore, the touch grid corresponding to the sub-pixel 200 at the outermost edge is consistent with the touch grid corresponding to the sub-pixel 200 in the middle of the display area A, preventing color difference and color shift problems at the outermost sub-pixel 200.

[0032] by Figure 2 As shown in the figure, the pixel unit may include a red sub-pixel (R) 210, a green sub-pixel (G) 220 and a blue sub-pixel (B) 230. Figure 2 As shown in FIG, there are two green sub-pixels, and each color sub-pixel corresponds to a touch grid.

[0033] It should be noted that here, the touch grid near the edge of the peripheral area B has the same shape as the touch grid in the middle of the display area A, which means that the touch grid pattern 300 corresponding to a certain color sub-pixel 200 in the middle of the display area A is regarded as a complete grid. Then, the touch grid corresponding to the sub-pixel 200 near the peripheral area B is also a complete grid.

[0034] For example, as shown in the figure, the shape of the touch grid corresponding to the sub-pixel 200 in the middle of the display area A can be a complete hexagonal shape, and the touch grid shape corresponding to the sub-pixel 200 at the edge can also be a hexagon consistent with the touch grid shape of the central sub-pixel 200.

[0035] It should also be noted that the above specific shapes of the touch grid are merely examples and are not limiting. For example, if the touch grid in the middle of the display area A is a complete quadrilateral, the touch grids at the edges are also complete quadrilaterals.

[0036] In the embodiment of the present disclosure, a plurality of peripheral signal lines 400 are arranged in the peripheral area B. The plurality of peripheral signal lines 400 may include display signal peripheral lines connected to the driving circuit in the display array layer or touch signal peripheral lines connected to the touch grid pattern 300 in the touch layer.

[0037] Among the plurality of peripheral signal lines 400 , the peripheral signal line 400 closest to the display area A is a first peripheral signal line 410 .

[0038] The first peripheral signal trace 410 may be a signal guard trace or a touch signal peripheral trace, such as a TX trace (transmitting signal trace) or an RX trace (receiving signal trace).

[0039] It should be noted that when the plurality of peripheral signal lines 400 include touch signal peripheral lines, they will be connected to the touch grid pattern 300 . Therefore, the plurality of peripheral signal lines 400 may include areas connected to the touch grid pattern 300 and areas not connected to the touch grid pattern 300 .

[0040] Figure 3 FIG. 4 shows a layout diagram of a plurality of peripheral signal traces 400 and a touch grid pattern 300 in an access area. Figure 3 As shown in FIG, in the access area, the touch grid shape on the sub-pixel at the edge is incomplete relative to the touch grid shape of the sub-pixel in the middle of the display area, and is directly connected to the corresponding peripheral signal lines. Figure 3 The first peripheral trace 410 closest to the display area is an Rx peripheral signal line, and the Rx lines 310 in the outermost touch grid are directly connected to the Rx peripheral signal line 410 .

[0041] Regarding the area where the touch grid pattern and the surrounding signal lines are not connected, in related technologies, such as Figure 2 As shown, the minimum spacing a between the first peripheral signal line closest to the display area and the sub-pixel light-emitting area closest to the line (i.e., the pixel opening of the pixel definition layer PD) is approximately 15 to 20 μm, and the distance b between the sub-pixel light-emitting area in the display area and the peripheral signal line is 25 to 30 μm. The limited space will cause the touch grid shape at the edge to be incomplete.

[0042] In the embodiment of the present disclosure, the touch grid pattern 300 and the peripheral signal line 400 are not connected to the area, and the minimum spacing b between the first peripheral signal line 410 and the sub-pixel light-emitting area closest to the first peripheral signal line 410 is 30 to 40 μm; the minimum spacing a between the first peripheral signal line 410 and the touch grid closest to the first peripheral signal line 410 is 15 to 25 μm.

[0043] By adopting the above solution, the first peripheral signal line 410 among the multiple peripheral signal lines 400 is moved outward compared to the peripheral signal lines 400 in the prior art to increase the minimum distance b between the edge sub-pixel 200 and the first peripheral signal line 410, providing space for the design of a complete touch grid at the edge. The minimum spacing a between the first peripheral signal line 410 and the touch grid closest to the first peripheral signal line 410 is 15 to 25 μm, and an a value of approximately 20 μm can be achieved without the risk of short circuit. For example, the minimum distance b can be 35.5 μm and a can be 19.58 μm.

[0044] In some embodiments, a ratio (a / b) of the minimum spacing a between the first peripheral signal line and the touch grid closest to the first peripheral signal line to the minimum spacing b between the first peripheral signal line and the sub-pixel light-emitting area closest to the first peripheral signal line ranges from 3 / 8 to 5 / 6.

[0045] It should be noted that since the first peripheral signal line 410 is moved outward by about 10 μm compared to the related art, if multiple peripheral signal lines 400 are moved outward as a whole, the outermost peripheral signal line 400 may be too close to the frame. Therefore, the line width of the peripheral signal line 400 and / or the gap between adjacent peripheral signal lines 400 can be appropriately reduced to compensate for the outward distance of the first peripheral signal line 410 to ensure that the position of the outermost peripheral signal line 400 relative to the edge remains unchanged.

[0046] For example, in some embodiments, the spacing between adjacent peripheral signal lines 400 ranges from 4 to 10 μm, and the line width of each peripheral signal line 400 ranges from 3.5 to 50 μm. For example, in some embodiments, the spacing between adjacent peripheral signal lines 400 ranges from 3.5 μm.

[0047] In actual applications, for different models of products, the outward displacement distance of the first peripheral signal line is the line width and gap compensation size of multiple peripheral signal lines. The compensation size can be reasonably distributed according to the layout of multiple peripheral signal lines. For example, the compensation size is 10μm and the number of peripheral signal lines is 10. Then, compared with the related technology, the line width of each peripheral signal line can be reduced by 1μm when designing.

[0048] Furthermore, it should be noted that the touch display substrate in the embodiments of the present disclosure may be an OLED display substrate. In this case, the light-emitting layer includes a first electrode and a second electrode disposed opposite each other, and an electroluminescent material layer located between the first electrode and the second electrode. It is understood that the touch display substrate is not limited to an OLED display substrate and may also be, for example, a QLED display substrate.

[0049] In addition, in some embodiments, the touch grid pattern 300 and the first peripheral signal lines 410 are arranged on the same layer. It should be noted that the touch grid pattern 300 and the first peripheral signal lines 410 are arranged on the same layer, which means, for example, when the touch grid pattern 300 includes two layers of touch signal lines, the first peripheral signal lines 410 are arranged on the same layer as at least one layer of touch signal lines.

[0050] Figure 4 FIG. 1 is a schematic diagram of a partial cross-sectional structure of an embodiment of a touch display substrate disclosed herein.

[0051] like Figure 4 As shown, the touch display substrate includes a substrate 100 and a display array layer 10 , a light emitting layer 20 and a touch layer 30 located on the substrate 100 .

[0052] In some embodiments, the display array layer 10, the light-emitting layer 20 and the touch layer 30 are arranged in sequence from a side close to the substrate 100 to a side away from the substrate 100, wherein a first buffer layer is provided on the substrate 100, and the display array layer 10 is provided on the first buffer layer 40. The display array layer 10 may include thin film transistors, gate lines, data lines, etc.

[0053] For example, the display array layer 10 may include an active layer 11 (Active) arranged on a first buffer layer 40, a first gate insulating layer (GI1) 12 covering the active layer 11, a gate layer (Gate) 13 located on the first gate insulating layer 12, a second gate insulating layer (GI2) 14 covering the gate layer 13, an interlayer dielectric layer (ILD) 15 located on the second gate insulating layer 14, a source-drain metal layer (SD) 16 located on the interlayer dielectric layer 15, etc.; wherein the pattern of the gate layer 13 may include a gate and a gate line; the pattern of the source-drain metal layer includes a source electrode, a drain electrode, a data line, etc.

[0054] It should be noted that Figure 4 The gate layer 13 shown in FIG is located on the side of the active layer 11 away from the substrate, which is only an example. In other embodiments, the gate layer 13 may also be located on the side of the active layer 11 close to the substrate. Figure 4 In the embodiment shown, the source-drain metal layer 16 has two layers (i.e., a double SD metal layer structure), including a first SD layer (SD1) 161 and a second SD layer (SD2) 162. A first insulating layer (PVX) 17, a second insulating layer (PLN1) 18 and other insulating layers are provided between the first SD layer and the second SD layer. In other embodiments, the source-drain metal layer may also include only one SD layer.

[0055] The light-emitting layer 20 is arranged on a flat layer PLN2)21( on the side of the source / drain metal layer 16 facing away from the substrate, wherein a pixel definition layer (PDL) 22 is provided on the flat layer 21, and an opening is opened on the pixel definition layer 22 to define a sub-pixel light-emitting area. The light-emitting layer 20 can be located in the sub-pixel light-emitting area, and the light-emitting layer may include a first electrode 23 connected to the source / drain metal layer, an organic light-emitting layer 24 located on the side of the first electrode facing away from the substrate, and a second electrode 25 located on the side of the organic light-emitting layer facing away from the substrate.

[0056] Illustratively, the first electrode 23 may be an anode, and the second electrode 25 may be a cathode; or, the first electrode 23 is a cathode, and the second electrode 25 is an anode.

[0057] The light emitting layer 20 is covered with an organic encapsulation layer 50 and an inorganic encapsulation layer 60 .

[0058] In some embodiments, such as Figure 4As shown, the touch layer 30 includes a second buffer layer 31 disposed on the light-emitting layer 20 and at least two touch metal layers disposed on the side of the second buffer layer 31 facing away from the substrate. Exemplarily, the touch layer 30 includes a first touch signal line 32 disposed sequentially from the side away from the substrate to the side close to the substrate, an insulating layer 33 located on the side of the first touch signal line 32 facing away from the substrate, and a second touch signal line 34 located in the insulating layer. The second touch signal line includes a plurality of touch grids distributed in an array. The touch grids arranged in the same row in the first direction are directly connected via connection bridges provided on the same layer as the touch grids; the touch grids arranged in the same column in the second direction are connected via touch bridges on different layers from the touch grids. The second touch signal line 34 includes the touch grids and the connection bridges; the first touch signal line 32 includes the touch bridges.

[0059] In addition, illustratively, a photosensitive adhesive layer (OC layer) 60 is further provided on the side of the touch layer 30 facing away from the substrate.

[0060] In addition, it should be noted that in the embodiment of the present disclosure, the outermost sub-pixel 200 can be a red sub-pixel 200, and the touch grid around the red sub-pixel 200 at the edge is missing. In actual applications, the outermost sub-pixel 200 can also be a green sub-pixel 200 or a blue sub-pixel 200, which is determined by the pixel arrangement.

[0061] In addition, it should be noted that the touch display substrate provided in the embodiments of the present disclosure is particularly suitable for a curved display substrate.

[0062] In addition, the present disclosure also provides a display device including the touch display substrate provided in the present disclosure. Obviously, the display device provided in the present disclosure can also bring about the beneficial effects brought about by the touch display substrate provided in the present disclosure.

[0063] The display device provided in the embodiments of the present disclosure can be various types of display products such as mobile phones, tablets, smart wearable devices, etc.

[0064] There are a few points to note:

[0065] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0066] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present disclosure are exaggerated or reduced, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or intervening elements may be present.

[0067] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0068] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A touch display substrate, comprising: a display area and a peripheral area located outside the display area; the touch display substrate comprising: A substrate, a display array layer, a light-emitting layer, and a touch layer located on the substrate; the light-emitting layer includes a plurality of pixel units located in the display area, each of the pixel units includes at least two sub-pixels of different colors, and the touch layer includes a touch grid pattern; characterized in that: Each touch grid of the touch grid pattern is arranged around at least one sub-pixel; and the touch grid corresponding to the sub-pixel near the peripheral area has the same shape as the touch grid corresponding to the sub-pixel of the same color in the central part of the display area; A plurality of peripheral signal lines are arranged in the peripheral area, wherein a peripheral signal line closest to the display area among the plurality of peripheral signal lines is a first peripheral signal line; The minimum distance b between the first peripheral signal line and the sub-pixel light-emitting area closest to the first peripheral signal line is 30-40 μm; The minimum spacing a between the first peripheral signal line and the touch grid closest to the first peripheral signal line is 15 to 25 μm; The ratio a / b of the minimum spacing a between the first peripheral signal line and the touch grid closest to the first peripheral signal line to the minimum spacing b between the first peripheral signal line and the sub-pixel light-emitting area closest to the first peripheral signal line is in the range of 3 / 8 to 5 / 6.

2. The touch display substrate according to claim 1, wherein: The minimum distance b between the first peripheral signal line and the sub-pixel closest to the first peripheral signal line is 35.5 μm; the minimum distance between the first peripheral signal line and the touch grid closest to the first peripheral signal line is 19.58 μm.

3. The touch display substrate according to claim 1, wherein: The spacing between adjacent ones of the plurality of peripheral signal lines ranges from 4 to 10 μm.

4. The touch display substrate according to claim 3, wherein: The line width of each peripheral signal line ranges from 3.5 to 50 μm.

5. The touch display substrate according to claim 1, wherein: The light-emitting layer includes a first electrode and a second electrode that are opposite to each other and an electroluminescent material layer located between the first electrode and the second electrode.

6. The touch display substrate according to claim 1, wherein: The touch grid pattern and at least a portion of the first peripheral signal lines are arranged on the same layer.

7. A display device, characterized in that: The touch display substrate comprises the touch display substrate according to any one of claims 1 to 6.

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