Foldable display panel and foldable display device

Abstract

The application relates to a foldable display panel and a foldable display device. The foldable display panel has a bending area, and comprises a display substrate. One side of the display substrate is provided with touch control leads, the touch control leads comprise first touch control leads and second touch control leads, and the second touch control leads are located on the side, away from the display substrate, of the first touch control leads. In the thickness direction of the display substrate, the thickness of the second touch control leads is greater than the thickness of the first touch control leads. In at least part of the bending area, the orthographic projection of the first touch control leads on the display substrate is located in the orthographic projection of the second touch control leads on the display substrate. Therefore, the foldable display panel and the foldable display device provided by the application can solve the problem that the touch control leads are prone to breakage.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a foldable display panel and a foldable display device. Background Technology

[0002] With the continuous development of display technology, people have higher demands for display devices, hoping to satisfy the user experience of large screens and wide viewing angles when in use, while also desiring good portability when not in use. To meet this demand, foldable display devices have been mass-produced and have become a typical example of combining large screens and portability.

[0003] However, during the folding process of the aforementioned foldable display device, the touch leads located in the bezel area are prone to breakage. Summary of the Invention

[0004] Therefore, it is necessary to provide a foldable display panel and a foldable display device to solve the problem of easy breakage of touch leads.

[0005] In a first aspect, embodiments of this application provide a foldable display panel having a first bending region. The foldable display panel includes a display substrate, and a touch lead is disposed on one side of the display substrate. The touch lead includes a first touch lead and a second touch lead, which are stacked. The second touch lead is located on the side of the first touch lead opposite to the display substrate. Along the thickness direction of the display substrate, the thickness of the second touch lead is greater than the thickness of the first touch lead. In at least a portion of the first bending region, the orthographic projection of the first touch lead onto the display substrate lies within the orthographic projection of the second touch lead onto the display substrate.

[0006] The foldable display panel provided in this application embodiment has an edge of the orthographic projection of the second touch lead onto the display substrate located outside the orthographic projection of the first touch lead onto the display substrate in at least a portion of the first bending area. This ensures that the edge of the second touch lead and the first touch lead are not directly aligned along the thickness direction of the display substrate. When the foldable display panel is folded, in this at least a portion of the first bending area, the edge of the second touch lead will not exert force on the first touch lead, and the force exerted on the first touch lead by the non-edge portion of the second touch lead is more uniform, thereby mitigating the possibility of breakage of the first touch lead.

[0007] Secondly, embodiments of this application provide a foldable display device, including the foldable display panel described in the first aspect above.

[0008] The foldable display device provided in this application includes a foldable display panel. In at least a portion of the first bending area, the edge of the orthographic projection of the second touch lead on the display substrate is located outside the orthographic projection of the first touch lead on the display substrate, such that the edge of the second touch lead and the first touch lead are not directly opposite each other along the thickness direction of the display substrate. When the foldable display panel is folded, in the at least a portion of the first bending area, the edge of the second touch lead will not exert force on the first touch lead, and the force exerted on the first touch lead by the non-edge portion of the second touch lead is more uniform, thereby mitigating the possibility of breakage of the first touch lead. Attached Figure Description

[0009] Figure 1 This is a top view of the foldable display panel provided in an embodiment of this application.

[0010] Figure 2 A partial top view of the first touch lead, the second touch lead, and the display substrate in the first bending area provided in the embodiments of this application.

[0011] Figure 3 for Figure 2 A sectional view along the AA direction.

[0012] Figure 4a A partial cross-sectional view of the first touch lead, the second touch lead, and the display substrate in the non-bending area provided in an embodiment of this application.

[0013] Figure 4b Another partial cross-sectional view of the first touch lead, the second touch lead, and the display substrate in the non-bending area provided in the embodiments of this application.

[0014] Figure 5 A partial top view of the first touch lead, the second touch lead, and the display substrate in the first display area provided in the embodiments of this application.

[0015] Figure 6 for Figure 5 An enlarged structural diagram of part E.

[0016] Figure 7 for Figure 6 BB-direction sectional view.

[0017] Figure 8 for Figure 6 CC-direction sectional view.

[0018] Figure 9 for Figure 5 An enlarged structural diagram of part F.

[0019] Figure 10A partial top view of the first touch lead, the second touch lead, and the conductive element of the first sub-non-display area provided in the embodiments of this application.

[0020] Figure 11 for Figure 10 DD section view.

[0021] Figure 12 This is a scanning electron microscope image of a cross-section of the first non-display region.

[0022] Figure 13 A cross-sectional scanning electron microscope image of the first sub-display area provided in an embodiment of this application.

[0023] Figure label:

[0024] 100. Foldable display panel; 101a. First bending area; 101b. First display area; 101c. First non-display area; 1011. First boundary; 1012. Second boundary; 102a. Second bending area; 100d. Non-bending area; 101d. First non-bending area; 102d. Second non-bending area; 102b. Second display area; 102c. Second non-display area; 1021c. First sub-non-display area; 1022c. Second sub-non-display area; 110. First touch lead; 111. First segment; 1111. First side; 1112. Second side; 113. Third segment; 115. Fifth segment; 115 5. Fifth side; 1156. Sixth side; 117. Seventh segment; 119. Ninth segment; 120. Second touch lead; 122. Second segment; 1223. Third side; 1224. Fourth side; 124. Fourth segment; 126. Sixth segment; 1267. Seventh side; 1268. Eighth side; 128. Eighth segment; 1281. First sub-segment; 1282. Second sub-segment; 1210. Tenth segment; 130. Display substrate; 141. First insulating layer; 142. Second insulating layer; 151. First via; 152. Second via; 153. Third via; 154. Fourth via; 160. Conductive component. Detailed Implementation

[0025] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] When describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more light-emitting units present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more light-emitting units present.

[0028] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0029] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0030] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0031] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0032] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0033] In related technologies, foldable display panels include a bending region and non-bending regions located on both sides of the bending region. In the bending region, the display panel may include a first touch lead and a second touch lead disposed on one side of a substrate. The second touch lead is located on the side of the first touch lead facing away from the substrate. The width of the first touch lead is equal to the width of the second touch lead, and the thickness of the second touch lead is greater than the thickness of the first touch lead. When the foldable display panel is in a folded state, the first and second touch leads undergo significant deformation. The relatively thin first touch lead becomes even thinner after bending, making it more prone to breakage under high stress.

[0034] However, because the width of the first touch lead is equal to the width of the second touch lead, and due to manufacturing process errors, the overlapping portions of the first and second touch leads along the thickness direction of the substrate cannot completely overlap. The edge of the orthographic projection of the second touch lead onto the substrate lies within the orthographic projection of the first touch lead onto the substrate, causing the edge of the second touch lead to be directly opposite the center of the first touch lead along the thickness direction of the substrate. When the foldable display panel is in a folded state, this edge of the second touch lead, directly opposite the center of the first touch lead, will exert a significant force on the first touch lead (since this force is a line force). The stress generated by this edge of the second touch lead on the first touch lead is relatively concentrated, causing the thinner first touch lead to break under the force of this edge of the second touch lead.

[0035] Based on the aforementioned technical problems, the inventors have discovered that this application provides a foldable display panel and a foldable display device. In at least a portion of the first bending area, the orthographic projection of the first touch lead on the display substrate lies within the orthographic projection of the second touch lead on the display substrate. This arrangement ensures that, in at least a portion of the first bending area, the edge of the orthographic projection of the second touch lead on the display substrate lies outside the orthographic projection of the first touch lead on the display substrate, preventing the edge of the second touch lead from directly aligning with the first touch lead along the thickness direction of the display substrate. When the foldable display panel is folded, in this at least a portion of the first bending area, the edge of the second touch lead does not exert force on the first touch lead, and the force exerted on the first touch lead by the non-edge portion of the second touch lead is more uniform (this force is a surface force), thereby mitigating the risk of breakage of the first touch lead.

[0036] The above is the core idea of ​​this application. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] The following will combine Figures 1-13 The foldable display device provided in the embodiments of this application will be described.

[0038] This embodiment provides a foldable display device, which may include a foldable display panel 100. The foldable display device can be a mobile phone or any electronic product with display function, including but not limited to the following categories: televisions, laptops, desktop monitors, tablets, digital cameras, smart bracelets, smart glasses, automotive displays, industrial control equipment, medical displays, touch interactive terminals, etc. This application embodiment does not make any special limitations on these categories.

[0039] In some embodiments, the foldable display panel 100 may include an organic light-emitting diode (OLED) display panel, a quantum dot light-emitting diode (QLED) display panel, a mini light-emitting diode display (Mini LED), or a micro light-emitting diode display (Micro LED), etc. This application uses an OLED display panel as an example for illustration.

[0040] For example, the foldable display panel 100 can be applied to screens with large curvature, such as quadruple or double-curved screens.

[0041] See Figure 1 The foldable display panel 100 may have a first direction X, a second direction Y, and a third direction, all of which are different. The first direction X and the second direction Y can be any two different directions parallel to the foldable display panel 100, and the third direction can be any direction intersecting a plane parallel to the foldable display panel 100. For example, the first direction X, the second direction Y, and the third direction can be mutually perpendicular. For example, the first direction X can be the length direction of the foldable display panel 100, the second direction Y can be the width direction of the foldable display panel 100, and the third direction can be the thickness direction of the foldable display panel 100. The length, width, and thickness in the embodiments of this application are merely for descriptive convenience and do not imply any limitation on the dimensions. For example, the width can be greater than, equal to, or less than the length.

[0042] In some embodiments, see Figure 1The foldable display panel 100 may include a first bending area 101a and a non-bending area 100d, which are arranged adjacent to each other. For example, the first bending area 101a and the non-bending area 100d may be arranged adjacent to each other along a second direction Y. The number of first bending areas 101a and non-bending areas 100d is at least one, and one first bending area 101a and one non-bending area 100d are alternately arranged.

[0043] For example, the number of first bending regions 101a can be any number of 1, 2, 3, or more than 3. The number of non-bending regions 100d can be any number of 1, 2, 3, or more than 3.

[0044] This application embodiment uses the example of one first bending region 101a and two non-bending regions 100d, with the two non-bending regions 100d connected through the first bending region 101a, for illustration.

[0045] For example, see Figure 1 The first bending region 101a may have a first boundary 1011 and a second boundary 1012 spaced apart along the second direction Y. The distance between the first boundary 1011 and the second boundary 1012 may be greater than or equal to 4 mm and less than or equal to 8 mm. That is, the size range of the first bending region 101a along the second direction Y can be 4 mm to 8 mm, thereby avoiding the distance between the first boundary 1011 and the second boundary 1012 being too small, thus making the stress of the foldable display panel 100 in the first bending region 101a smaller when bent, so as to reduce the bending stress on each film layer. In addition, it can also avoid the distance between the first boundary 1011 and the second boundary 1012 being too large, which would be detrimental to the thinness of the foldable display panel 100 in the folded state.

[0046] For example, the distance between the first boundary 1011 and the second boundary 1012 can be 4mm, 5mm, 6mm, 7mm, 8mm or any value between 4mm and 8mm.

[0047] See Figure 1 The two non-bending areas 100d may include a first non-bending area 101d and a second non-bending area 102d, with the first bending area 101a located between the first non-bending area 101d and the second non-bending area 102d. The foldable display panel 100 located in the first bending area 101a can be bent and flattened, thereby realizing the folding and flattening of the foldable display panel 100.

[0048] It should be noted that the foldable display panel 100 may include a flattened state, a folded state, and an intermediate state between the two. The state of the foldable display panel 100 is also the state of the foldable display device.

[0049] like Figure 1 As shown, the flattened state refers to the state in which all parts of the foldable display panel 100 are approximately on the same plane. In this state, the first non-bending area 101d, the second non-bending area 102d, and the first bending area 101a are approximately on the same plane, and the angle between the first non-bending area 101d and the second non-bending area 102d is approximately 180 degrees. In the flattened state, the foldable display panel 100 has a larger display area to ensure a better user experience.

[0050] The folded state refers to the first bending area 101a of the foldable display panel 100 being bent, and the first non-bending area 101d and the second non-bending area 102d of the foldable display panel 100 at least partially overlapping in the thickness direction of the foldable display panel 100, with the included angle between the first non-bending area 101d and the second non-bending area 102d being approximately 0 degrees. In the folded state, the foldable display panel 100 and the foldable display device having the foldable display panel 100 are smaller in size, making it convenient for storage and carrying of the foldable display device.

[0051] For example, the foldable display panel 100 can be bent in a teardrop shape, and the distance between the two non-bending areas 100d of the foldable display panel 100 is relatively close, which can reduce the entry of external dust into the space between the two non-bending areas 100d of the foldable display panel 100, thereby protecting the foldable display panel 100.

[0052] In some embodiments, the first bending area 101a may include a first display area 101b and a first non-display area 101c arranged along the first direction X, and the first non-display area 101c may be located on at least one side of the first display area 101b along the first direction X.

[0053] In some embodiments, see Figure 1 Each non-bending area 100d may include a second display area 102b and a second non-display area 102c. The second non-display area 102c may be located outside the second display area 102b. For example, the second non-display area 102c may be located on at least one side of the second display area 102b along the first direction X. The second non-display area 102c may also be located on the side of the second display area 102b opposite to the first display area 101b. The second display area 102b and the first display area 101b may be connected, and the second non-display area 102c and the first non-display area 101c may be connected.

[0054] The non-display areas 101c and 102c together form the non-display area of ​​the foldable display panel 100, and the display area of ​​the foldable display panel 100 is formed by all the first display areas 101b and 102b together. The non-display areas may surround at least a portion of the outer periphery of the display area.

[0055] For example, the display area may include multiple open areas and non-open areas surrounding each open area, and the foldable display panel 100 may also include multiple light-emitting elements and touch leads. Figure 2 The first touch lead 110 and / or the second touch lead 120 are provided, and the light-emitting element is correspondingly disposed with respect to the opening area, with at least a portion of the light-emitting element located within the corresponding opening area. The touch lead can be located in a non-opening area, thereby avoiding the touch lead from affecting the light emission of the light-emitting element.

[0056] In some embodiments, see Figure 1 The foldable display panel 100 may include a second bending area 102a, which may be located on the side of the first non-bending area 101d away from the first bending area 101a. By bending the foldable display panel 100 in the second bending area 102a, a flexible circuit board (not shown in the figure) connected to the foldable display panel 100 can be disposed on the backlight surface of the foldable display panel 100, thereby reducing the bezel width of the foldable display device.

[0057] In some embodiments, see Figure 1 In the first non-bending area 101d, the second non-display area 102c may include a first sub-non-display area 1021c and a second sub-non-display area 1022c. The first sub-non-display area 1021c is located on the side of the second display area 102b away from the first bending area 101a, and the second sub-non-display area 1022c is located on opposite sides of the second display area 102b along the first direction X.

[0058] In some embodiments, see Figure 3 The foldable display panel 100 may include a display substrate 130 and touch leads (first touch lead 110 and / or second touch lead 120) located on one side of the display substrate 130. The display substrate 130 may provide support for the remaining structural layers subsequently installed. The touch leads may be used to implement touch functionality.

[0059] For example, see Figure 3 The touch lead may include a first touch lead 110 and a second touch lead 120 stacked together, and the second touch lead 120 may be located on the side of the first touch lead 110 away from the display substrate 130.

[0060] For example, along the thickness direction of the display substrate 130, the thickness of the second touch lead 120 can be greater than the thickness of the first touch lead 110, thereby making the second touch lead 120 thicker and less prone to breakage when folded. In addition, the thickness of the first touch lead 110 is smaller, which is beneficial to the thinning of the foldable display panel 100.

[0061] In some embodiments, see Figure 3 The foldable display device can be an inwardly folding display device, meaning that when the foldable display device is in a folded state, the folded touch lead is located inside the display substrate 130. At this time, the surface of the display substrate 130 in the first non-bending region 101d facing the touch lead and the surface of the display substrate 130 in the second non-bending region 102d facing the touch lead are arranged opposite each other. In this case, the foldable display panel 100 is an inwardly folding display panel.

[0062] In some embodiments, the foldable display device can be an outward-folding display device. That is, when the foldable display device is in a folded state, the folded touch lead is located on the outside of the display substrate 130, and the foldable display panel 100 can perform display functions in the folded state to meet different display scenario requirements. At this time, the surface of the display substrate 130 in the first non-bending region 101d facing away from the touch lead and the surface of the display substrate 130 in the second non-bending region 102d facing away from the touch lead are arranged opposite to each other. At this time, the foldable display panel 100 is an outward-folding display panel.

[0063] This application uses an example of an inwardly foldable display panel 100 to illustrate the embodiments.

[0064] The following is a detailed description of each film layer of the foldable display panel 100 provided in the embodiments of this application.

[0065] In some embodiments, see Figure 11 A first insulating layer 141 (e.g., an inorganic material, low cost) may be provided between the first touch lead 110 and the second touch lead 120. The first insulating layer 141 can be used to electrically isolate the first touch lead 110 and the second touch lead 120. A second insulating layer 142 may be provided on the side of the first touch lead 110 and the second touch lead 120 that is further away from the display substrate 130. The second insulating layer 142 can be used to protect the touch lead and can also serve a planarization function (e.g., an organic material).

[0066] See Figure 1 and Figure 2In at least a portion of the first bending region 101a (e.g., the first non-display region 101c, and / or, a portion of the first display region 101b), the orthographic projection of the first touch lead 110 on the display substrate 130 can lie within the orthographic projection of the second touch lead 120 on the display substrate 130. This configuration ensures that, in at least a portion of the first bending region 101a, the size of the second touch lead 120 is larger than the size of the first touch lead 110, and the edge of the orthographic projection of the second touch lead 120 on the display substrate 130 lies outside the orthographic projection of the first touch lead 110 on the display substrate 130, so that the edge of the second touch lead 120 and the first touch lead 110 are not directly opposite each other along the thickness direction of the display substrate 130. When the foldable display panel 100 is folded, in the at least part of the first bending area 101a, the edge of the second touch lead 120 will not exert force on the first touch lead 110, and the force applied to the first touch lead 110 by the non-edge part of the second touch lead 120 is more uniform (this force is a surface force), thereby alleviating the breakage of the first touch lead 110.

[0067] The touch leads of the first non-display area 101c provided in the embodiments of this application will be described below.

[0068] In some embodiments, see Figure 2 and Figure 3 In the first non-display area 101c, the first touch lead 110 may include a first segment 111, and the second touch lead 120 may include a second segment 122. Both the first segment 111 and the second segment 122 may extend along the second direction Y. The first segment 111 and the second segment 122 may be electrically connected, thereby realizing the parallel connection of the first segment 111 and the second segment 122, so as to reduce the resistance of the touch leads at the first segment 111 and the second segment 122 and improve the signal transmission stability of the touch leads at the first segment 111 and the second segment 122.

[0069] For example, see Figure 2 and Figure 3 The width of the first segment 111 along the first direction X is smaller than the width of the second segment 122 along the first direction X. The orthographic projection of the first segment 111 on the display substrate 130 lies within the orthographic projection of the second segment 122 on the display substrate 130. With this configuration, the width of the second segment 122 along the first direction X is greater than the width of the first segment 111 along the first direction X, ensuring that the edges of the second segment 122 along both sides of the first direction X are not directly opposite the first segment 111 along the thickness direction of the display substrate 130. After the foldable display panel 100 is folded, the edges of the second segment 122 along both sides of the first direction X will not exert force on the first segment 111, thereby mitigating the risk of breakage of the first segment 111. The principle has already been explained and will not be repeated here.

[0070] For example, see Figure 3 The first segment 111 may have a first side 1111 and a second side 1112 disposed opposite to each other along the first direction X, and the second segment 122 may have a third side 1223 and a fourth side 1224 disposed opposite to each other along the first direction X. The first side 1111 and the third side 1223 are close to each other, and the second side 1112 and the fourth side 1224 are close to each other. The orthographic projection of the first side 1111 on the display substrate 130 and the orthographic projection of the third side 1223 on the display substrate 130 have a first distance, and the orthographic projection of the second side 1112 on the display substrate 130 and the orthographic projection of the fourth side 1224 on the display substrate 130 have a second distance.

[0071] For example, the first distance can be greater than or equal to 10μm and less than or equal to 20μm, thereby avoiding the first distance being too small. This ensures that the edges of the second segment 122 along the first direction X and the first segment 111 along the thickness direction of the display substrate 130 are not directly opposite each other, even with manufacturing process errors. This helps to better mitigate the breakage of the first segment 111. In addition, it can also avoid the first distance being too large, thereby increasing the density of the touch lead layout.

[0072] For example, the first distance can be greater than or equal to 13μm and less than or equal to 18μm, which can better alleviate the breakage of the first segment 111. In addition, it can also better improve the layout density of the touch lead.

[0073] For example, the first distance can be 10μm, 12μm, 13μm, 15μm, 18μm, 20μm or any value between 10μm and 20μm.

[0074] For example, the second distance can be greater than or equal to 10μm and less than or equal to 20μm, which can alleviate the breakage of the first segment 111. In addition, it can also increase the layout density of the touch lead. The principle has been explained and will not be repeated here.

[0075] For example, the second distance can be greater than or equal to 13μm and less than or equal to 18μm, which can better alleviate the breakage of the first segment 111. In addition, it can also better improve the layout density of the touch lead.

[0076] For example, the second distance can be 10μm, 12μm, 13μm, 15μm, 18μm, 20μm or any value between 10μm and 20μm.

[0077] For example, the first distance can be equal to the second distance, which helps to ensure the uniformity of the force exerted by the second segment 122 on the first segment 111. In other examples, the first distance may not be equal to the second distance, which can reduce the difficulty of fabrication.

[0078] The touch lead of the non-bending area 100d provided in the embodiments of this application will be described below.

[0079] In some embodiments, see Figure 4a and Figure 4b In the non-bending area 100d, the first touch lead 110 may include a third segment 113, and the second touch lead 120 may include a fourth segment 124. For example, the third segment 113 and the fourth segment 124 may extend in the same direction. For example, both the third segment 113 and the fourth segment 124 may intersect obliquely with the first direction X. Alternatively, both the third segment 113 and the fourth segment 124 may be parallel to either the first direction X or the second direction Y.

[0080] For example, see Figure 4a Along the extension direction perpendicular to the third segment 113, the width of the third segment 113 is smaller than the width of the fourth segment 124. The orthographic projection of the third segment 113 onto the display substrate 130 can lie within the orthographic projection of the fourth segment 124 onto the display substrate 130, resulting in a larger width for the fourth segment 124. This facilitates electrical connection between the third segment 113 and the fourth segment 124. For example, the third segment 113 and the fourth segment 124 can be connected via a second via 152. Furthermore, the larger width of the fourth segment 124 allows for better shielding of the third segment 113, thereby effectively mitigating the reflection of ambient light by the third segment 113.

[0081] For example, see Figure 4b Along the extension direction perpendicular to the third segment 113, the width of the third segment 113 can be equal to the width of the fourth segment 124. The orthographic projection of the third segment 113 on the display substrate 130 and the orthographic projection of the fourth segment 124 on the display substrate 130 can coincide, which helps to reduce the layout space of the foldable display panel 100 occupied by the third segment 113 and the fourth segment 124, and helps to improve the aperture ratio of the foldable display panel 100.

[0082] The touch leads of the first display area 101b provided in the embodiments of this application will be described below.

[0083] In some embodiments, see Figure 5 and Figure 6In the first display area 101b, the first touch lead 110 may include a fifth segment 115, and the second touch lead 120 may include a sixth segment 126. The fifth segment 115 and the sixth segment 126 may extend in the same direction. For example, both the fifth segment 115 and the sixth segment 126 may intersect obliquely with the first direction X. Alternatively, both the fifth segment 115 and the sixth segment 126 may be parallel to either the first direction X or the second direction Y.

[0084] For example, see Figure 7 and Figure 8 The fifth section and the sixth section 126 can be connected through the third through hole 153.

[0085] For example, see Figure 6 and Figure 7 Along the extension direction perpendicular to the fifth segment 115, the width of the fifth segment 115 can be smaller than the width of the sixth segment 126. The orthographic projection of the fifth segment 115 on the display substrate 130 lies within the orthographic projection of the sixth segment 126 on the display substrate 130. Both the fifth segment 115 and the sixth segment 126 can be located in the overlapping region G. Figure 6 In this configuration, the edges on both sides of the sixth segment 126 in the width direction are not directly aligned with the fifth segment 115 along the thickness direction of the display substrate 130. After the foldable display panel 100 is folded, the edges on both sides of the sixth segment 126 in the width direction will not exert force on the fifth segment 115, thereby mitigating the possibility of breakage of the fifth segment 115. The principle has been explained and will not be repeated here.

[0086] For example, see Figure 6 and Figure 7 Along the extending direction perpendicular to the fifth segment 115, the fifth segment 115 may have a fifth side 1155 and a sixth side 1156 arranged opposite to each other, and the sixth segment 126 may have a seventh side 1267 and an eighth side 1268 arranged opposite to each other. The fifth side 1155 and the seventh side 1267 are close to each other, and the sixth side 1156 and the eighth side 1268 are close to each other. The orthographic projection of the fifth side 1155 on the display substrate 130 and the orthographic projection of the seventh side 1267 on the display substrate 130 may have a third distance, and the orthographic projection of the sixth side 1156 on the display substrate 130 and the orthographic projection of the eighth side 1268 on the display substrate 130 may have a fourth distance.

[0087] For example, the third distance can be greater than or equal to 0.5 μm and less than or equal to 12 μm, thereby avoiding the third distance being too small. This ensures that the edges on both sides of the width direction of the sixth segment 126 and the fifth segment 115 are not directly aligned with each other along the thickness direction of the display substrate 130, even under the premise of manufacturing process errors. This can better alleviate the breakage of the fifth segment 115. In addition, it can also avoid the third distance being too large, which can help improve the aperture ratio of the foldable display panel 100.

[0088] For example, the third distance can be greater than or equal to 0.7 μm and less than or equal to 10 μm, which can better alleviate the breakage of the fifth segment 115. In addition, it can also better improve the aperture ratio of the foldable display panel 100.

[0089] For example, the third distance can be 0.5μm, 1μm, 2μm, 5μm, 10μm, 12μm or any value between 0.5μm and 12μm.

[0090] For example, the fourth distance can be greater than or equal to 0.5 μm and less than or equal to 12 μm, which can alleviate the breakage of the fifth segment 115. In addition, it can also improve the aperture ratio of the foldable display panel 100. The principle has been explained and will not be repeated here.

[0091] For example, the fourth distance can be greater than or equal to 0.7 μm and less than or equal to 10 μm, which can better alleviate the breakage of the fifth segment 115. In addition, it can also better improve the aperture ratio of the foldable display panel 100.

[0092] For example, the fourth distance can be 0.5μm, 1μm, 2μm, 5μm, 10μm, 12μm or any value between 0.5μm and 12μm.

[0093] For example, the third distance can be equal to the fourth distance, which helps to ensure the uniformity of the force applied by the sixth segment 126 to the fifth segment 115 after the foldable display panel 100 is folded. In other examples, the third distance may not be equal to the fourth distance, thereby reducing the difficulty of manufacturing.

[0094] In some embodiments, see Figure 5 and Figure 9Within the first display area 101b, the first touch lead 110 may include a seventh segment 117, and the second touch lead 120 may include an eighth segment 128. The extending directions of the seventh segment 117 and the eighth segment 128 may be different, and the seventh segment 117 and the eighth segment 128 may intersect each other. For example, the eighth segment 128 may include a connected first sub-segment 1281 and a second sub-segment 1282. Along the extending direction perpendicular to the eighth segment 128, the width of the first sub-segment 1281 may be greater than the width of the second sub-segment 1282, thereby making the width of the second sub-segment 1282 smaller, which is beneficial to improving the aperture ratio. Furthermore, the orthographic projection of the seventh segment 117 on the display substrate 130 and the orthographic projection of the eighth segment 128 on the display substrate 130 intersect the orthographic projection of the first sub-segment 1281 on the display substrate 130. Since the width of the first sub-segment 1281 is relatively large, the area of ​​the first sub-segment 1281 is relatively large. When the foldable display panel 100 is folded, the force exerted by the first sub-segment 1281 on the seventh segment 117 can be more dispersed on the first insulating layer 141, thereby relieving the stress on the seventh segment 117 and mitigating the phenomenon of breakage of the seventh segment 117. In addition, the facing area of ​​the first sub-segment 1281 and the seventh segment 117 along the thickness direction of the display substrate 130 is relatively large, which makes the force exerted by the first sub-segment 1281 on the seventh segment 117 more dispersed and uniform, thereby further mitigating the phenomenon of breakage of the seventh segment 117.

[0095] For example, the first sub-segment 1281 is a circular or polygonal structure, which is beneficial for better expanding the area of ​​the first sub-segment 1281.

[0096] The touch leads of the first sub-non-display area 1021c provided in the embodiments of this application will be described below.

[0097] In some embodiments, see Figure 10 and Figure 11 In the first sub-non-display area 1021c, the first touch lead 110 may include a ninth segment 119, and the second touch lead 120 may include a tenth segment 1210. The tenth segment 1210 is located closer to the light-emitting side of the foldable display panel 100 than the ninth segment 119. Figure 11 Upper middle level, section 119 of the ninth part is located Figure 11 Lower middle layer. Both the ninth segment 119 and the tenth segment 1210 extend in the second direction Y. For example, the ninth segment 119 and the tenth segment 1210 can be electrically connected through the fourth via 154, thereby reducing the resistance of the touch leads at the ninth segment 119 and the tenth segment 1210.

[0098] For example, the display panel 100 may be provided with a conductive element 160, which can be used to transfer touch leads to other layers. For example, the conductive element 160 may be located in the first sub-non-display area 1021c.

[0099] It should be noted that ink may be provided in the non-display area of ​​the foldable display panel 100. If the ink in the first sub-non-display area 1021c does not completely cover the first sub-non-display area 1021c due to process errors, the end of the first sub-non-display area 1021c near the second display area 102 may not be covered by ink.

[0100] For example, touch leads located in the display area can be connected to the touch chip via touch leads located in the non-display area. Touch leads located in the non-display areas on both sides of the display area along the first direction X can extend into the first sub-non-display area 1021c and then into the second bending area 102a. Therefore, the number of touch leads in the first sub-non-display area 1021c is relatively large. If one end of the first sub-non-display area 1021c near the second display area 102 is not covered by ink, a large number of touch leads will not be covered by the ink layer and will reflect ambient light. Figure 12 The image shows a cross-sectional scanning electron microscope (SEM) image of the ninth segment 119 and the tenth segment 1210 when their widths are equal. Because the ninth segment 119 and the tenth segment 1210 have equal widths, they are prone to not being able to completely overlap along the thickness direction of the display substrate 130. This results in the tenth segment 1210, which is directly opposite the edge of the ninth segment 119, sinking. Consequently, the metallic reflective area of ​​the side edge of the tenth segment 1210 in the area not covered by ink increases, leading to the visual problem of reflective white spots.

[0101] Therefore, see Figure 10 and Figure 11 This can be achieved by moving the tenth segment 1210 closer to the second display area 102b ( Figure 1 The orthographic projection of one end of the ninth segment 119 on the display substrate 130 is set to be within the orthographic projection of the end of the ninth segment 119 near the second display area 102b on the display substrate 130. Along the first direction X, the width of the end of the ninth segment 119 near the second display area 102b is greater than the width of the end of the tenth segment 1210 near the second display area 102b, so that the tenth segment 1210 will not be directly opposite the edge of the ninth segment 119 along the thickness direction of the display substrate 130, thereby alleviating the phenomenon of the tenth segment 1210 sinking and thus alleviating the problem of reflective white spot visual effect. Figure 13 The image shows a cross-sectional scanning electron microscope image when the width of the ninth segment 119 is greater than the width of the tenth segment 1210. It can be seen that the tenth segment 1210 does not show any sinking phenomenon.

[0102] In some embodiments, one of the first touch lead 110 and the second touch lead 120 is a bridging layer, and the other of the first touch lead 110 and the second touch lead 120 can be a touch function layer. This application embodiment uses the first touch lead 110 as a bridging layer and the second touch lead 120 as a touch function layer as an example for illustration.

[0103] For example, the touch function layer may include multiple first touch electrodes extending along a first direction X and multiple second touch electrodes extending along a second direction Y, with the first and second touch electrodes interleaved (i.e., crossing). Each first touch electrode may include multiple first touch electrode blocks arranged along the first direction X, and the first touch electrode blocks may be a grid structure formed by intersecting second touch leads 120. Each second touch electrode may include multiple second touch electrode blocks arranged along the second direction Y, and the second touch electrode blocks may be a grid structure formed by intersecting second touch leads 120. Since the touch electrode blocks (first touch electrode blocks and second touch electrode blocks) are grid structures, the grid structure touch electrode blocks can be located in non-opening areas so that the grid structure does not obstruct the opening areas, thereby reducing the impact of touch leads on the display effect of the display area.

[0104] For example, multiple touch electrode blocks of one of the first and second touch electrodes can be connected by the second touch lead 120 to form an uninterrupted structure. Multiple touch electrode blocks of the other of the first and second touch electrodes are discontinuous and can be connected by a bridge formed by the first touch lead 110. The bridge can be located at the intersection of the first and second touch electrodes to avoid short circuits between the first and second touch electrodes at the intersection.

[0105] For example, one of the first touch electrode and the second touch electrode is a driving electrode, and the other of the first touch electrode and the second touch electrode is a sensing electrode (detection electrode).

[0106] For example, the material of at least one of the first touch lead 110 and the second touch lead 120 may include metals such as titanium, silver, copper, aluminum, and molybdenum, or alloys, or conductive oxides (such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), aluminum zinc oxide (AZO), zinc gallium oxide, titanium tantalum oxide, tin oxide, cadmium oxide, and indium oxide, or any one or more of these.

[0107] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A foldable display panel, characterized in that, The foldable display panel has a first bending area. The foldable display panel includes a display substrate and a touch lead located on one side of the display substrate. The touch lead includes a first touch lead and a second touch lead. The second touch lead is located on the side of the first touch lead away from the display substrate. Along the thickness direction of the display substrate, the thickness of the second touch lead is greater than the thickness of the first touch lead. In at least a portion of the first bending area, the orthographic projection of the first touch lead on the display substrate is located within the orthographic projection of the second touch lead on the display substrate, such that the edge of the orthographic projection of the second touch lead on the display substrate is located outside the orthographic projection of the first touch lead on the display substrate, so as to avoid the edge of the second touch lead being directly opposite the first touch lead along the thickness direction of the display substrate. The first bending area has a non-bending area on at least one side along the second direction; the non-bending area includes a first non-bending area, which includes a second display area and a first sub-non-display area, the first sub-non-display area being located on the side of the second display area away from the first bending area; in the first sub-non-display area, the first touch lead includes a ninth segment, the second touch lead includes a tenth segment, the ninth segment and the tenth segment both extend along the second direction and are electrically connected; The orthographic projection of the end of the tenth segment near the second display area on the display substrate is located within the orthographic projection of the end of the ninth segment near the second display area on the display substrate.

2. The foldable display panel according to claim 1, characterized in that, The first bending area includes a first display area and a first non-display area arranged along a first direction, and the first direction and the second direction intersect.

3. The foldable display panel according to claim 2, characterized in that, In the first non-display area, the first touch lead includes a first segment, and the second touch lead includes a second segment. Both the first segment and the second segment extend along the second direction and are electrically connected. The width of the first segment along the first direction is smaller than the width of the second segment along the first direction, and the orthographic projection of the first segment on the display substrate is located within the orthographic projection of the second segment on the display substrate.

4. The foldable display panel according to claim 3, characterized in that, The first segment has a first side and a second side disposed opposite to each other along the first direction, and the second segment has a third side and a fourth side disposed opposite to each other along the first direction; The orthographic projection of the first side on the display substrate and the orthographic projection of the third side on the display substrate have a first distance, and the orthographic projection of the second side on the display substrate and the orthographic projection of the fourth side on the display substrate have a second distance; The first distance is greater than or equal to 10 μm and less than or equal to 20 μm; And / or, the second distance is greater than or equal to 10 μm and less than or equal to 20 μm.

5. The foldable display panel according to claim 4, characterized in that, The first distance is greater than or equal to 13 μm and less than or equal to 18 μm; And / or, the second distance is greater than or equal to 13 μm and less than or equal to 18 μm.

6. The foldable display panel according to claim 4, characterized in that, The first distance is equal to the second distance.

7. The foldable display panel according to any one of claims 2-6, characterized in that, The first bending region has a first boundary and a second boundary that are spaced apart along the second direction; The distance between the first boundary and the second boundary is greater than or equal to 4 mm and less than or equal to 8 mm.

8. The foldable display panel according to any one of claims 2-6, characterized in that, In the non-bending area, the first touch lead further includes a third segment, and the second touch lead further includes a fourth segment, wherein the third segment and the fourth segment extend in the same direction; Along the extension direction perpendicular to the third segment, the width of the third segment is smaller than the width of the fourth segment, and the orthographic projection of the third segment on the display substrate is located within the orthographic projection of the fourth segment on the display substrate.

9. The foldable display panel according to any one of claims 2-6, characterized in that, In the non-bending area, the first touch lead further includes a third segment, and the second touch lead further includes a fourth segment, wherein the third segment and the fourth segment extend in the same direction; Along the extension direction perpendicular to the third segment, the width of the third segment is equal to the width of the fourth segment, and the orthographic projection of the third segment on the display substrate coincides with the orthographic projection of the fourth segment on the display substrate.

10. The foldable display panel according to any one of claims 2-6, characterized in that, In the first display area, the first touch lead includes a fifth segment, and the second touch lead includes a sixth segment, wherein the fifth segment and the sixth segment extend in the same direction; Along the extension direction perpendicular to the fifth segment, the width of the fifth segment is smaller than the width of the sixth segment, and the orthographic projection of the fifth segment on the display substrate is located within the orthographic projection of the sixth segment on the display substrate.

11. The foldable display panel according to claim 10, characterized in that, Along the extension direction perpendicular to the fifth segment, the fifth segment has a fifth side and a sixth side arranged opposite to each other, and the sixth segment has a seventh side and an eighth side arranged opposite to each other; The orthographic projection of the fifth side on the display substrate and the orthographic projection of the seventh side on the display substrate have a third distance, and the orthographic projection of the sixth side on the display substrate and the orthographic projection of the eighth side on the display substrate have a fourth distance; The third distance is greater than or equal to 0.5 μm and less than or equal to 12 μm; And / or, the fourth distance is greater than or equal to 0.5 μm and less than or equal to 12 μm.

12. The foldable display panel according to claim 11, characterized in that, The third distance is greater than or equal to 0.7 μm and less than or equal to 10 μm; And / or, the fourth distance is greater than or equal to 0.7 μm and less than or equal to 10 μm.

13. The foldable display panel according to claim 11, characterized in that, The third distance is equal to the fourth distance.

14. The foldable display panel according to any one of claims 2-6, characterized in that, Within the first display area, the first touch lead includes a seventh segment, and the second touch lead includes an eighth segment. The extension directions of the seventh segment and the eighth segment are different, and the eighth segment has a connected first sub-segment and a second sub-segment. Along the extension direction perpendicular to the eighth segment, the width of the first sub-segment is greater than the width of the second sub-segment, and the orthographic projection of the seventh segment on the display substrate and the orthographic projection of the eighth segment on the display substrate intersect at the orthographic projection of the first sub-segment on the display substrate.

15. The foldable display panel according to claim 14, characterized in that, The first sub-segment is a circular or polygonal structure.

16. The foldable display panel according to any one of claims 2-6, characterized in that, In the first non-bending area, the first non-bending area includes a second non-display area, the second non-display area is located on a portion of the outer side of the second display area, the second display area is connected to the first display area, and the second non-display area is connected to the first non-display area; The second non-display area includes the first sub-non-display area; Along the first direction, the width of the ninth segment near the second display area is greater than the width of the tenth segment near the second display area.

17. A foldable display device, characterized in that, Includes the foldable display panel according to any one of claims 1 to 16.

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