Display substrate and display device

Abstract

Embodiments of the present invention provide a display substrate and a display device. The display substrate includes: a flexible substrate having a display area and a peripheral area located at least on one side of the display area, wherein the peripheral area includes a wiring area, a bending area, and a pad area in sequence along a direction away from the display area; a first electrical structure located on a side of the bending area of ​​the flexible substrate away from the pad area; a second electrical structure located in the pad area; wherein the flexible substrate includes: a first flexible substrate; a second flexible substrate located on the first flexible substrate; and a wiring located between the first flexible substrate and the second flexible substrate, wherein the wiring has a first portion located in the wiring area, a second portion in the bending area, and a third portion in the pad area, wherein the first electrical structure is connected to the first portion of the wiring, and the second electrical structure is connected to the third portion of the wiring.

Description

Technical Field

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

[0002] Flexible displays are widely used in smart terminal products such as mobile phones and tablets. Summary of the invention

[0003] Embodiments of the present invention provide a display substrate and a display device, which can reduce the thickness of the display substrate and the width of the lower frame of the display substrate.

[0004] In a first aspect of the present invention, a display substrate is provided. The display substrate comprises: a flexible substrate having a display area and a peripheral area located at least on one side of the display area, wherein the peripheral area includes a wiring area, a bending area and a pad area in sequence along a direction away from the display area; a first electrical structure located on a side of the bending area of ​​the flexible substrate away from the pad area; a second electrical structure located in the pad area; wherein the flexible substrate comprises: a first flexible substrate; a second flexible substrate located on the first flexible substrate; and a wiring located between the first flexible substrate and the second flexible substrate, wherein the wiring has a first portion located in the wiring area, a second portion in the bending area and a third portion in the pad area, wherein the first electrical structure is connected to the first portion of the wiring, and the second electrical structure is connected to the third portion of the wiring.

[0005] In an embodiment of the present invention, the display substrate further includes: a thin film transistor located in the display area, the thin film transistor including an active layer located on the flexible substrate, a gate insulating layer located on the active layer and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer has a first portion located in the display area and the wiring area, and the gate is a portion of a first conductive layer located on the first insulating layer; wherein the first conductive layer includes the first electrical structure.

[0006] In an embodiment of the present invention, the first insulating layer has a first side facing the flexible substrate, a second side facing away from the flexible substrate, and a third side connecting the first side and the second side and adjacent to the first part of the first insulating layer of the bending region, and the first electrical structure also includes a first part of the second side covering the first part of the first insulating layer and a second part covering the third side, wherein the first electrical structure contacts the first part of the wiring via the first opening of the second flexible substrate.

[0007] In an embodiment of the present invention, the display substrate further includes: a thin film transistor located in the display area, the thin film transistor including an active layer located on the flexible substrate, a gate insulating layer located on the active layer and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer having a first portion located in the display area and the wiring area, and the gate being a portion of a first conductive layer located on the first insulating layer; a second insulating layer including a first portion on the first portion of the first insulating layer located in the display area and the wiring area and a first portion on the first conductive layer; a second conductive layer located on the second insulating layer; wherein at least one of the first conductive layer and the second conductive layer includes the first electrical structure.

[0008] In an embodiment of the present invention, the second conductive layer includes the first electrical structure, the second insulating layer has a first side facing the flexible substrate, a second side away from the flexible substrate, and a third side of the first part of the second insulating layer connecting the first side and the second side and adjacent to the bending area, the first electrical structure also includes a first part of the second side covering the first part of the second insulating layer and a second part covering the third side, wherein the first electrical structure contacts the first part of the wiring via the first opening of the second flexible substrate.

[0009] In an embodiment of the present invention, the display substrate further comprises: a thin film transistor located in the display area, the thin film transistor comprising an active layer located on the flexible substrate, a gate insulating layer located on the active layer and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer having a first portion located in the display area and the wiring area, and the gate being a portion of a first conductive layer located on the first insulating layer; a second insulating layer comprising a first portion on the first portion of the first insulating layer and a first portion on the first conductive layer located in the display area and the wiring area; a second conductive layer located on the second insulating layer; a third insulating layer comprising a first portion of the second insulating layer and a first portion on the second conductive layer located in the display area and the wiring area; a third conductive layer located on the third insulating layer, wherein the third conductive layer comprises a source / drain electrode of the thin film transistor, the source / drain electrode being connected to the source / drain region of the active layer of the thin film transistor through a hole passing through the first insulating layer, the second insulating layer and the third insulating layer; wherein at least one of the first conductive layer, the second conductive layer and the third conductive layer comprises the first electrical structure.

[0010] In an embodiment of the present invention, the third conductive layer includes the first electrical structure, the third insulating layer has a first side facing the flexible substrate, a second side away from the flexible substrate, and a third side of the first part of the third insulating layer connecting the first side and the second side and adjacent to the bending area, the first electrical structure also includes a first part of the second side covering the first part of the third insulating layer and a second part covering the third side, wherein the first electrical structure contacts the first part of the wiring via a first opening of the second flexible substrate.

[0011] In an embodiment of the present invention, the display substrate further comprises: a thin film transistor, which is located in the display area, the thin film transistor comprising an active layer located on the flexible substrate, a gate insulating layer located on the active layer and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer having a first portion located in the display area and the wiring area, and the gate being a portion of a first conductive layer located on the first insulating layer; a second insulating layer comprising a first portion on the first portion of the first insulating layer located in the display area and the wiring area and a first portion on the first conductive layer; a second conductive layer located on the second insulating layer; a third insulating layer comprising a first portion located in the display area and the wiring area a first portion of the second insulating layer within the display area and the wiring area and a first portion on the second conductive layer; a third conductive layer located on the third insulating layer, wherein the third conductive layer includes a source / drain electrode of the thin film transistor, and the source / drain electrode is connected to the source / drain region of the active layer of the thin film transistor through a hole passing through the first insulating layer, the second insulating layer and the third insulating layer; a fourth insulating layer including a first portion on the first portion of the third insulating layer within the display area and the wiring area; and a fourth conductive layer located on the fourth insulating layer; wherein at least one of the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer includes the first electrical structure.

[0012] In an embodiment of the present invention, the fourth conductive layer includes the first electrical structure, the fourth insulating layer has a first side facing the flexible substrate, a second side away from the flexible substrate, and a third side of the first part of the fourth insulating layer connecting the first side and the second side and adjacent to the bending area, the first electrical structure also includes a first part of the second side covering the first part of the fourth insulating layer and a second part covering the third side, wherein the first electrical structure contacts the first part of the wiring via the first opening of the second flexible substrate.

[0013] In an embodiment of the present invention, the first conductive layer includes the first electrical structure, and the display substrate further includes a third electrical structure located on the third insulating layer, and the third electrical structure is connected to the first electrical structure through a hole passing through the third insulating layer.

[0014] In an embodiment of the present invention, the second conductive layer includes the first electrical structure, and the display substrate further includes a third electrical structure located on the third insulating layer, and the third electrical structure is connected to the first electrical structure through a hole passing through the third insulating layer.

[0015] In an embodiment of the present invention, at least one of the third conductive layer and the fourth conductive layer includes the third electrical structure.

[0016] In an embodiment of the present invention, the first insulating layer also includes a second portion located in the pad area, the second insulating layer also includes a second portion on the second portion of the first insulating layer in the pad area; the third insulating layer also includes a second portion on the second portion of the second insulating layer in the pad area; the fourth insulating layer also includes a second portion on the second portion of the third insulating layer in the pad area; and wherein at least one of the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer also includes a second electrical structure, and the second electrical structure is connected to the third portion of the wiring via the second opening of the second flexible substrate.

[0017] In an embodiment of the present invention, the wiring includes a first wiring, a second wiring, a third wiring and a fourth wiring arranged at intervals along a direction perpendicular to the direction from the display area to the pad area, the first electrical structure includes a first sub-electrical structure, a second sub-electrical structure, a third sub-electrical structure and a fourth sub-electrical structure, the second electrical structure includes a fifth sub-electrical structure, a sixth sub-electrical structure, a seventh sub-electrical structure and an eighth sub-electrical structure; wherein the first conductive layer includes the first sub-electrical structure and the fifth sub-electrical structure; the second conductive layer includes the second sub-electrical structure and the sixth sub-electrical structure; the third conductive layer includes the third sub-electrical structure and the seventh sub-electrical structure; and the fourth conductive layer includes the fourth sub-electrical structure and the eighth sub-electrical structure.

[0018] In an embodiment of the present invention, the first portion of the wiring extends to the display area in a direction from the pad area to the display area, and the flexible substrate further includes an insulating layer located between the first flexible substrate and the second flexible substrate, wherein the insulating layer includes a first portion located in the display area and the wiring and a second portion located in the pad area, at least a portion of the first portion of the wiring is located between the first portion of the insulating layer and the second flexible substrate, and at least a portion of the third portion of the wiring is located between the second portion of the insulating layer and the second flexible substrate.

[0019] In an embodiment of the present invention, the first portion of the wiring includes a first sub-portion located between the first portion of the insulating layer and the second flexible substrate, a second sub-portion located between the first portion of the insulating layer and the first flexible substrate, and a third sub-portion connecting the first sub-portion and the second sub-portion, wherein the third portion of the wiring includes a first sub-portion located between the second portion of the insulating layer and the second flexible substrate, a second sub-portion located between the second portion of the insulating layer and the first flexible substrate, and a third sub-portion connecting the first sub-portion and the second sub-portion.

[0020] In an embodiment of the present invention, the second conductive layer comprises the first electrical structure, and the first electrical structure is connected to the first portion of the wiring through a hole passing through the first insulating layer, the second insulating layer and the second flexible substrate.

[0021] In a second aspect of the present invention, a display device is provided, comprising any one of the display substrates described in the first aspect of the present invention.

[0022] In the embodiment described in the present invention, by configuring the wiring that sequentially passes through the display area, the bending area, and the pad area to be arranged between the first flexible substrate and the second flexible substrate, various wirings in the peripheral area around the display area can be jumped to the wiring, thereby reducing the width of the peripheral area. In addition, in the bending area, since the wiring is arranged between the first flexible substrate and the second flexible substrate, the wiring is located at the neutral layer of the overall substrate composed of the first flexible substrate and the second flexible substrate, so there is no need to additionally use ultraviolet glue, thereby avoiding the increase in the width of the border area caused by the ultraviolet glue.

[0023] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present application can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for illustrative purposes and are not intended to limit the scope of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are for illustrative purposes only of selected embodiments, not all possible implementations, and are not intended to limit the scope of the present application, wherein:

[0025] Figure 1A A schematic diagram of a flexible display substrate is shown;

[0026] Figure 1B A cross-sectional view of a flexible display substrate in a bending region is shown;

[0027] Figure 2A A schematic diagram showing a display substrate according to an embodiment of the present invention is shown;

[0028] Figure 2B shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0029] Figure 3 shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0030] Figure 4 shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0031] Figure 5 shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0032] Figure 6 shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0033] Figure 7 shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0034] Figure 8 shows a top view of a display substrate according to an embodiment of the present invention;

[0035] Fig. 9 shows a cross-sectional view of a display substrate according to an embodiment of the present invention;

[0036] Fig.10 A cross-sectional view of a display substrate according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0037] Various embodiments will now be described in detail with reference to the accompanying drawings, which are provided as exemplary examples of the present invention to enable those skilled in the art to implement the present invention.

[0038] It is noteworthy that the following drawings and examples are not meant to limit the scope of the present invention. In the case where a specific element of the present invention can be partially or completely implemented using a known assembly (or method or process), only those parts of such known assembly (or method or process) required for understanding the present invention will be described, and the detailed description of other parts of such known assembly will be omitted so as not to confuse the present invention. Further, various embodiments include equivalents known now and in the future that are equivalent to the assembly involved herein by way of illustration.

[0039] In the description of the present disclosure, the terms "on", "above", "below", "under", "between", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer, or there can be an intermediate element or layer; similarly, when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or layer, or there can be at least one intermediate element or layer; when an element or layer is referred to as being "between" two elements or layers, it can be the only element or layer between the two elements or layers, or there can be more than one intermediate element or layer.

[0040] Unless otherwise clearly indicated in the context, the singular form of the words used in this article and the appended claims includes the plural, and vice versa. Thus, when referring to the singular, the plural of the corresponding term is usually included. Similarly, the terms "comprise", "include", "contain" and "have" and their grammatical variations are intended to be inclusive and represent that there may be other elements in addition to the listed elements. Where the term "example" is used in this article, especially when it is located after a group of terms, the "example" is merely exemplary and illustrative, and should not be considered exclusive or extensive. The terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance and formation order.

[0041] Figure 1A FIG. 1 is a schematic diagram of a flexible display substrate 10. Figure 1A As shown, the lower frame of the flexible display substrate 10 is provided with power signal lines (VSS, VDD) and fan-out lines (Fanout) of the data signal lines, which results in a problem that the width of the lower frame of the flexible display substrate 10 is relatively large, which is not conducive to realizing a narrow frame design. In the related art, the lower frame of the flexible display substrate is often bent to reduce the width of the lower frame.

[0042] Figure 1BShows Figure 1A The cross-sectional view of the flexible display substrate 10 in the bending area is shown. Figure 1B As shown, the flexible display substrate 10 includes a flexible base 11 and wiring 12 for connecting pixels and integrated circuit chips. Since the wiring 12 is usually not an organic material, it is resistant to compression but not to tension. In the absence of ultraviolet (UV) glue 13, the wiring 12 is in a tensile state when it is bent, so it is easy to break. In material mechanics, when a structure A with a multilayer structure is bent and deformed, some layers are elongated and deformed, and other layers are compressed. At the junction of the elongated layer and the compressed layer, the layer that neither elongates nor shortens is called the neutral layer of structure A. By coating a layer of UV glue 13 on the wiring 12, the position of the neutral layer can be adjusted so that the bent wiring 12 is in a compressed state rather than a tensile state, thereby avoiding the problem of wiring 12 breaking. However, the additional UV glue 13 will lead to an increase in the thickness of the flexible display substrate 10 in the bending area.

[0043] Figure 2A 1 is a schematic diagram showing a display substrate according to an embodiment of the present invention, Figure 2B Shows Figure 2A The cross-sectional view of the display substrate at line LL is shown. Figure 2A and 2B As shown, the display substrate may include a flexible substrate 21, a first electrical structure 22, and a second electrical structure 23. The flexible substrate 21 has a display area AA and a peripheral area located at least on one side of the display area AA. Figure 2A As shown, the peripheral area includes a wiring area DD, a bending area CC and a pad area BB in sequence along a direction away from the display area AA. The flexible substrate 21 may include a first flexible substrate 211, a second flexible substrate 212 located on the first flexible substrate 211, and a wiring 213 located between the first flexible substrate 211 and the second flexible substrate 212. The second flexible substrate 212 may have a first opening 2121 located in the display area AA and a second opening 2122 located in the pad area BB. The wiring 213 has a first portion 2131 located in the wiring area DD, a second portion 2132 located in the bending area CC, and a third portion 2133 located in the pad BB area. The first electrical structure 22 is located on a side of the bending area CC of the flexible substrate 21 away from the pad area BB. As shown in FIG. 2, the first electrical structure 22 is located in the wiring area DD and / or the display area AA, and is connected to the first portion 2131 of the wiring 213 via the first opening 2121. The second electrical structure 23 is located in the pad region BB of the flexible substrate 21 and is connected to the third portion 2133 of the wiring 213 via the second opening 2122 .

[0044] In an embodiment of the present invention, the materials of the first flexible substrate and the second flexible substrate may include polyimide, and the wiring material may include metal molybdenum, a stacked structure of Ti / Al / Ti, or other conductive materials. The first electrical structure may include a data signal line, a scan signal line, a light emitting signal line, a power line, etc. The second electrical structure may include a signal line, a pad or an integrated circuit chip, etc.

[0045] Through the above configuration that the wiring that passes through the wiring area, the bending area and the pad area in sequence is arranged between the first flexible substrate and the second flexible substrate, various wirings located in the wiring area and / or the display area can be jumped to the wiring. In addition, in the bending area, since the wiring is arranged between the first flexible substrate and the second flexible substrate, the wiring is located at the neutral layer of the overall substrate composed of the first flexible substrate and the second flexible substrate, so there is no need to additionally use UV glue, thereby avoiding the increase in the thickness of the border area caused by the UV glue. In the present application, thickness refers to the height of the surface away from the substrate from the surface close to the substrate in the direction perpendicular to the plane of the substrate.

[0046] Figure 3 1 shows a cross-sectional view of a display substrate according to an embodiment of the present invention. In the present application, the cross-sectional view of the display substrate may be taken along Figure 2A The display substrate is shown as being intercepted by line LL. Figure 3 As shown, the display substrate also includes a thin film transistor 24, a first insulating layer 25 (25a, 25b), a first conductive layer 26, a second insulating layer 27 (27a, 27b), a second conductive layer 28, a third insulating layer 29 (29a, 29b), a third conductive layer 30, a fourth insulating layer 31 (31a, 31b) and a fourth conductive layer 32.

[0047] It should be noted that for the sake of clarity, Figure 3 The first electrical structure 22 and the second electrical structure 23 are not shown. Figure 4-7 Various configurations of the first electrical structure 22 and the second electrical structure 23 are shown in detail in FIG.

[0048] Continue to refer Figure 3 , the thin film transistor 24 is located in the display area AA and includes an active layer 241 located on the flexible substrate 21, a gate insulating layer 242 located on the active layer 241, and a gate 243 located on the gate insulating layer 242. In an embodiment of the present invention, the gate insulating layer 242 is a part of the first insulating layer 25, the gate 243 is a part of the first conductive layer 26, and the source / drain electrode 244 is a part of the third conductive layer 30. The source / drain electrode 244 can be connected to the source / drain region of the active layer 241 of the thin film transistor 24 through a hole passing through the first insulating layer 25, the second insulating layer 27, and the third insulating layer 29.

[0049] like Figure 3 As shown, the first insulating layer 25 may cover the flexible substrate 21 and have a first portion 25a located in the display area AA and the wiring area DD and a second portion 25b located in the pad area BB. The first conductive layer 26 may be located on the first insulating layer 25. The second insulating layer 27 may include a first portion 27a and a second portion 27b, wherein the first portion 27a is located on the first portion 25a of the first insulating layer 25 and the first conductive layer 26 in the display area AA and the wiring area DD, and the second portion 27b is located on the second portion 25b of the first insulating layer 25 in the pad area BB. The second conductive layer 28 may be located on the second insulating layer 27. The third insulating layer 29 may include a first portion 29a and a second portion 29b, wherein the first portion 29a is located on the first portion 27a and the second conductive layer 28 of the second insulating layer 27 in the display area AA and the wiring area DD, and the second portion 29b is located on the second portion 27b of the second insulating layer 27 in the pad area BB. The third conductive layer 30 may be located on the third insulating layer 29 and may include the source / drain electrode 244 of the thin film transistor 24. The fourth insulating layer 31 may include a first portion 31a and a second portion 31b, wherein the first portion 31a is located on the first portion 29a of the third insulating layer 29 and the third conductive layer 30 in the display area AA and the wiring area DD, and the second portion 31b is located on the second portion 29b of the third insulating layer 29 in the pad area BB. The fourth conductive layer 32 may be located on the fourth insulating layer 31.

[0050] Figure 3 The display substrate shown may further include: a first barrier layer 34 (i.e., as a part of the flexible substrate 21) located between the first flexible substrate 211 and the second flexible substrate 212, a second barrier layer 35 located between the first insulating layer 25 and the second flexible substrate 212, a first planarization layer 36 located on the fourth insulating layer 31, a second planarization layer 37 as a fifth insulating layer located on the first planarization layer 36 and covering the fourth conductive layer 32, an anode layer 38 as a part of the light emitting device located on the second planarization layer 37, and a pixel defining layer 39 located on the second planarization layer 37 and the anode layer 38. Figure 3 As shown, the fourth conductive layer 32 may be located on the first planarization layer 36 and contact the third conductive layer 30 through a hole passing through the first planarization layer 36 and the first portion 31a of the fourth insulating layer 31. It should be understood that Figure 3 The display substrate shown may also include other additional film layers or structures depending on actual needs, which are not specifically limited or described herein.

[0051] In an embodiment of the present invention, Figure 3 At least one of the illustrated first conductive layer 26 , second conductive layer 28 , third conductive layer 30 , and fourth conductive layer 32 may include the first electrical structure 22 shown in FIG. 2 .

[0052] Figure 4 FIG. 4 shows a cross-sectional view of a display substrate according to an embodiment of the present invention, wherein the first conductive layer 26 includes a first electrical structure 22a and a second electrical structure 23a. Figure 4 As shown, the first insulating layer 25 has a first side facing the flexible substrate 21, a second side facing away from the flexible substrate 21, and a third side of the first portion 25a of the first insulating layer 25 connecting the first side and the second side and adjacent to the bending region CC. The first electrical structure 22a may include a first portion 22a1 and a second portion 22a2. The first portion 22a1 may cover the second side of the first portion 25a of the first insulating layer 25. The second portion 22a2 may cover the third side of the first portion 25a of the first insulating layer 25, and may contact the first portion 2131 of the wiring 213 via the first opening in the second flexible substrate 212.

[0053] like Figure 4 As shown, the second portion 25b of the first insulating layer 25 has a fourth side connecting the first side and the second side of the first insulating layer 25 and adjacent to the bending region CC. The second electrical structure 23a may include a first portion 23a1 and a second portion 23a2. The first portion 23a1 may cover the second side of the second portion 25b of the first insulating layer 25. The second portion 23a2 may cover the fourth side of the second portion 25b of the first insulating layer 25 and may contact the third portion 2133 of the wiring 213 via the second opening in the second flexible substrate 212.

[0054] exist Figure 4In the example shown, the third conductive layer 30 of the display substrate also includes a third electrical structure 301 located in the display area AA and an electrical structure 30″ located in the pad area BB. The third electrical structure 301 of the third conductive layer 30 can contact the first portion 22a1 of the first electrical structure 22a via openings in the first portion 27a of the second insulating layer 27 and the first portion 29a of the third insulating layer 29. The electrical structure 30″ can contact the first portion 23a1 of the second electrical structure 23a via openings in the second portion 27b of the second insulating layer 27 and the second portion 29b of the third insulating layer 29. In addition, the fourth conductive layer 32 of the display substrate also includes a third electrical structure 301 located in the display area AA and an electrical structure 32″ located in the pad area BB. The third electrical structure 301 of the fourth conductive layer 32 can contact the third electrical structure 301 of the third conductive layer 32 via the first portion 31a of the fourth insulating layer 31 and the opening in the first planarization layer 36. The electrical structure 32″ can contact the electrical structure 30″ via the second portion 31b of the fourth insulating layer 31 and the opening in the first planarization layer 36. In the present application, the electrical structure 30″ and the electrical structure 32″ can be set according to the function of the circuit. For example, the electrical structures 30″ and 32″ can be any desired functional components, for example, connecting parts connecting other electrical structures.

[0055] Figure 5 2 shows a display substrate according to an embodiment of the present invention, wherein the second conductive layer 28 of the display substrate includes a first electrical structure 22b and a second electrical structure 23b. Figure 5 As shown, the second insulating layer 27 has a first side facing the flexible substrate 21, a second side facing away from the flexible substrate 21, and a third side of the first portion 27a of the second insulating layer 27 connecting the first side and the second side and adjacent to the bending region CC. The first electrical structure 22b includes a first portion 22b1 and a second portion 22b2. The first portion 22b1 may cover the second side of the first portion 27a of the second insulating layer 27. The second portion 22b2 may cover the third side of the first portion 27a of the second insulating layer 27 and contact the first portion 2131 of the wiring 213 via the first opening in the second flexible substrate 212.

[0056] like Figure 5 As shown, the second portion 27b of the second insulating layer 27 has a fourth side connecting the first side and the second side of the second insulating layer 27 and adjacent to the bending region CC. The second electrical structure 23b includes a first portion 23b1 and a second portion 23b2. The first portion 23b1 may cover the second side of the second portion 27b of the second insulating layer 27. The second portion 23b2 covers the fourth side of the second portion 27b of the second insulating layer 27 and contacts the third portion 2133 of the wiring 213 via the second opening in the second flexible substrate 212.

[0057] exist Figure 5 In the example shown, the third conductive layer 30 of the display substrate also includes a third electrical structure 301 located in the display area AA and an electrical structure 30″ located in the bending area CC. The third electrical structure 301 of the third conductive layer 30 contacts the first part 22b1 of the first electrical structure 22b via an opening in the first part 29a of the third insulating layer 29. The electrical structure 30″ contacts the first part 23b1 of the second electrical structure 23b via an opening in the second part 29b of the third insulating layer 29. In addition, the fourth conductive layer 32 of the display substrate also includes a third electrical structure 301 located in the display area AA and an electrical structure 32″ located in the pad area BB. The third electrical structure 301 of the fourth conductive layer 32 contacts the third electrical structure 301 of the third conductive layer 32 via an opening in the first part 31a of the fourth insulating layer 31 and the first planarization layer 36. The electrical structure 32″ contacts the electrical structure 30″ via the second part 31b of the fourth insulating layer 31 and the opening in the first planarization layer 36.

[0058] Figure 6 FIG. 4 shows a display substrate according to an embodiment of the present invention, wherein the third conductive layer 30 of the display substrate includes a first electrical structure 22c and a second electrical structure 23c. Figure 6 As shown, the third insulating layer 29 has a first side facing the flexible substrate 21, a second side facing away from the flexible substrate 21, and a third side of the first portion 29a of the third insulating layer 29 connecting the first side and the second side and adjacent to the bending area CC. The first electrical structure 22c may include a first portion 22c1 and a second portion 22c2. The first portion 22c1 may cover the second side of the first portion 29a of the third insulating layer 29. The second portion 22c2 may cover the third side of the first portion 29a of the third insulating layer 29 and contact the first portion 2131 of the wiring 213 via the first opening in the second flexible substrate 212.

[0059] like Figure 6 As shown, the second portion 29b of the third insulating layer 29 has a fourth side connecting the first side and the second side of the third insulating layer 29 and adjacent to the bending region CC. The second electrical structure 23c includes a first portion 23c1 and a second portion 23c2. The first portion 23c1 may cover the second side of the second portion 29b of the third insulating layer 29. The second portion 23c2 may cover the fourth side of the second portion 29b of the third insulating layer 29 and contact the third portion 2133 of the wiring 213 via the second opening in the second flexible substrate 21.

[0060] Figure 7 1 shows a display substrate according to an embodiment of the present invention, wherein the fourth conductive layer 32 of the display substrate includes a first electrical structure 22d and a second electrical structure 23d. Figure 7As shown, the fourth insulating layer 31 has a first side facing the flexible substrate 21, a second side facing away from the flexible substrate 21, and a third side of the first portion 31a of the fourth insulating layer 31 connecting the first side and the second side and adjacent to the bending region CC. The first electrical structure 22d includes a first portion 22d1 and a second portion 22d2. The first portion 22d1 may cover the second side of the first portion 31a of the fourth insulating layer 31. The second portion 22d2 may cover the third side of the first portion 31a of the fourth insulating layer 31 and contact the first portion 2131 of the wiring 213 via the first opening in the second flexible substrate.

[0061] like Figure 7 As shown, the second portion 31b of the fourth insulating layer 31 has a fourth side connecting the first side and the second side of the fourth insulating layer 31 and adjacent to the bending region CC. The second electrical structure 23d includes a first portion 23d1 and a second portion 23d2. The first portion 23d1 may cover the second side of the second portion 31b of the fourth insulating layer 31. The second portion 23d2 may cover the fourth side of the second portion 31b of the fourth insulating layer 31 and contact the third portion 2133 of the wiring 213 via the second opening in the second flexible substrate.

[0062] Figure 8 FIG. 2 shows a top view of a display substrate according to an embodiment of the present invention. Figure 8 As shown, the wiring of the display substrate may include a first wiring 213a, a second wiring 213b, a third wiring 213c, and a fourth wiring 213d spaced apart along the x direction. The x direction is perpendicular to the direction from the display area AA to the pad area BB (i.e., the y direction). In this example, the first wiring 213a is Figure 4 The first wiring 213 and the second wiring 213b are shown in FIG. Figure 5 The first wiring 213 and the third wiring 213c are shown. Figure 6 The first wiring 213 and the fourth wiring 213d are shown. Figure 7 In this example, the first electrical structure of the display substrate may include a first sub-electrical structure (eg, Figure 4 The first electrical structure 22a shown), the second sub-electrical structure (eg, Figure 5 The first electrical structure 22b shown), the third sub-electrical structure (eg, Figure 6 The first electrical structure 22c shown) and the fourth sub-electrical structure (eg, Figure 7 In this example, the second electrical structure of the display substrate may include a fifth sub-electrical structure (eg, Figure 4 The second electrical structure 23a shown), the sixth sub-electrical structure (eg, Figure 5 The second electrical structure 23b shown), the seventh sub-electrical structure (eg, Figure 6 The second electrical structure 23c shown) and the eighth sub-electrical structure (eg, Figure 7 The second electrical structure 23d) is shown.

[0063] In this example, the first conductive layer of the display substrate may include a first sub-electrical structure and a fifth sub-electrical structure, the second conductive layer may include a second sub-electrical structure and a sixth sub-electrical structure, the third conductive layer may include a third sub-electrical structure and a seventh sub-electrical structure, and the fourth conductive layer may include a fourth sub-electrical structure and an eighth sub-electrical structure.

[0064] Fig. 9 1 shows a cross-sectional view of a display substrate according to an embodiment of the present invention. Fig. 9 As shown, the thin film transistor of the display substrate may include an edge thin film transistor 24' closest to the bending region CC along the y direction (i.e., the direction from the display region AA to the pad region BB). The first portion 2131 of the wiring 213 of the display substrate extends beyond the edge thin film transistor 24' and extends to the display region AA in the opposite direction of the y direction. Fig. 9 As shown, the flexible substrate 21 further includes an insulating layer 214 located between the first flexible substrate 211 and the second flexible substrate 212. The insulating layer 214 includes a first portion 214a located in the display area AA and the wiring area DD and a second portion 214b located in the pad area BB.

[0065] In an embodiment of the present invention, at least a portion of the first portion 2131 of the wiring 213 may be located between the first portion 214a of the insulating layer 214 and the second flexible substrate 212, and at least a portion of the third portion 2133 of the wiring 213 may be located between the second portion 214b of the insulating layer 214 and the second flexible substrate 212.

[0066] exist Fig. 9 In the example shown, the first portion 2131 of the wiring 213 may include a first sub-portion 2131a located between the first portion 214a of the insulating layer 214 and the second flexible substrate 212, a second sub-portion 2131b located between the first portion 214a of the insulating layer 214 and the first flexible substrate 211, and a third sub-portion 2131c connecting the first sub-portion 2131a and the second sub-portion 2131b. Fig. 9As shown, the third sub-portion 2131c may connect the first sub-portion 2131a and the second sub-portion 2131b via a hole in the first portion 214a of the insulating layer 214. The third portion 2133 of the wiring 213 may include a first sub-portion 2133a located between the second portion 214b of the insulating layer 214 and the second flexible substrate 212, a second sub-portion 2133b located between the second portion 214b of the insulating layer 214 and the first flexible substrate 211, and a third sub-portion 2133c connecting the first sub-portion 2133a and the second sub-portion 2133b. Fig. 9 As shown, the third sub-portion 2133 c may connect the first sub-portion 2133 a and the second sub-portion 2133 b via a hole in the second portion 214 b of the insulating layer 214 .

[0067] like Fig. 9 As shown, the second conductive layer 28 of the display substrate may include the first electrical structure 22 shown in FIG. 2. The first electrical structure 22 is located in the display area AA. The first electrical structure 22 is connected to the first sub-portion 2131a of the first portion 2131 of the wiring 213 through a hole passing through the first portion 27a of the second insulating layer, the first portion 25a of the first insulating layer, the second barrier layer 35, and the second flexible substrate 212. The second conductive layer 28 is also located on the second insulating layer 27b in the pad area BB, and the second conductive layer 28 may include the second electrical structure 23 shown in FIG. 2, and the second electrical structure 23 is connected to the first sub-portion 2133a of the third portion 2133 of the wiring 213 through a hole passing through the second portion 27b of the second insulating layer, the second portion 25b of the first insulating layer, the second barrier layer 35, and the second flexible substrate 212. It should be noted that Fig. 9 The other layers or structures of the display substrate shown are Figure 3 The film layers or structures of the display substrates shown are the same and will not be described again. Fig. 9 The first electrical structure 22 shown may also be located between the edge thin film transistor 24 ′ and the wiring region DD.

[0068] Fig.10 1 shows a cross-sectional view of a display substrate according to an embodiment of the present invention. Fig.10As shown, the insulating layer 214 has a first side facing the flexible substrate 21, a second side facing away from the flexible substrate 21, and a third side of the first portion 214a of the insulating layer 214 connecting the first side and the second side and adjacent to the bending zone CC. The third sub-portion 2131c of the first portion 2131 of the wiring 213 of the display substrate can cover the third side of the first portion 214a of the insulating layer 214 to connect the first sub-portion 2131a and the second sub-portion 2131b. The second portion 214b of the insulating layer 214 has a fourth side connecting the first side and the second side of the insulating layer 214 and adjacent to the bending zone CC. The third sub-portion 2133c of the third portion 2133 of the wiring 213 can cover the fourth side of the second portion 214b of the insulating layer 214 to connect the first sub-portion 2133a and the second sub-portion 2133b. It should be noted that Fig.10 The other layers or structures of the display substrate shown are Fig. 9 The film layers or structures of the display substrates shown are the same and will not be described again.

[0069] Although this application Figure 4-7 as well as Figure 9-10 Taking the display substrate including the first insulating layer, the first conductive layer, the second insulating layer, the second conductive layer, the third insulating layer, the third conductive layer, the fourth insulating layer and the fourth conductive layer as an example, it can be understood that these film layers can be increased or decreased according to actual needs. In addition, the first electrical structure and the second electrical structure can be simultaneously arranged in the corresponding conductive layer as needed.

[0070] In another aspect of the present invention, a display device including the display substrate described in the aforementioned embodiment is also provided. By configuring the wiring that passes through the display area, the bending area, and the pad area in sequence to be arranged between the first flexible substrate and the second flexible substrate, various wirings in the peripheral area around the display area can be jumped to the wiring, thereby reducing the width of the peripheral area. In addition, in the bending area, since the wiring is arranged between the first flexible substrate and the second flexible substrate, the wiring is located at the neutral layer of the overall substrate composed of the first flexible substrate and the second flexible substrate, so that there is no need to additionally use UV glue, thereby avoiding the increase in the width of the border area caused by the UV glue.

[0071] The foregoing description of the embodiment is provided above for the purpose of illustration and description. It is not intended to be exhaustive or to limit the present application. Each element or feature of a particular embodiment is generally not limited to a particular embodiment, but, in appropriate circumstances, these elements and features are interchangeable and can be used in selected embodiments, even if not specifically shown or described. Also can be changed in many ways. This change cannot be considered to be out of the present application, and all these modifications are included in the scope of the present application.

Claims

1. A display substrate, comprising: A flexible substrate having a display area and a peripheral area located at at least one side of the display area, wherein the peripheral area includes a wiring area, a bending area and a pad area in sequence along a direction away from the display area; a first electrical structure located on a side of the bending region of the flexible substrate away from the pad region; a second electrical structure located within the pad region; Wherein, the flexible substrate comprises: a first flexible substrate; a second flexible substrate, located on the first flexible substrate; and a wiring located between the first flexible substrate and the second flexible substrate, wherein the wiring has a first portion located in the wiring area, a second portion in the bending area, and a third portion in the pad area, wherein the first electrical structure is connected to the first portion of the wiring, and the second electrical structure is connected to the third portion of the wiring, The second flexible substrate has a first opening located in the display area and a second opening located in the pad area, wherein the first electrical structure contacts the first portion of the wiring via the first opening, and wherein the second electrical structure is connected to the third portion of the wiring via the second opening.

2. The display substrate according to claim 1, further comprising: a thin film transistor located in the display area, the thin film transistor comprising an active layer located on the flexible substrate, a gate insulating layer located on the active layer, and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer has a first portion located in the display area and the wiring area, and the gate is a portion of a first conductive layer located on the first insulating layer; Wherein, the first conductive layer includes the first electrical structure.

3. The display substrate according to claim 2, wherein: The first insulating layer has a first side facing the flexible substrate, a second side facing away from the flexible substrate, and a third side of the first portion of the first insulating layer connecting the first side and the second side and adjacent to the bending region, and the first electrical structure also includes a first portion of the second side covering the first portion of the first insulating layer and a second portion covering the third side.

4. The display substrate according to claim 1, further comprising: a thin film transistor located in the display area, the thin film transistor comprising an active layer located on the flexible substrate, a gate insulating layer located on the active layer, and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer has a first portion located in the display area and the wiring area, and the gate is a portion of a first conductive layer located on the first insulating layer; a second insulating layer including a first portion located on the first portion of the first insulating layer in the display area and the wiring area and on the first conductive layer; a second conductive layer, located on the second insulating layer; Wherein, at least one of the first conductive layer and the second conductive layer includes the first electrical structure.

5. The display substrate according to claim 4, wherein: The second conductive layer includes the first electrical structure, the second insulating layer has a first side facing the flexible substrate, a second side facing away from the flexible substrate, and a third side of the first portion of the second insulating layer connecting the first side and the second side and adjacent to the bending area, the first electrical structure also includes a first portion of the second side covering the first portion of the second insulating layer and a second portion covering the third side.

6. The display substrate according to claim 1, further comprising: a thin film transistor located in the display area, the thin film transistor comprising an active layer located on the flexible substrate, a gate insulating layer located on the active layer, and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer has a first portion located in the display area and the wiring area, and the gate is a portion of a first conductive layer located on the first insulating layer; a second insulating layer including a first portion located on the first portion of the first insulating layer in the display area and the wiring area and on the first conductive layer; a second conductive layer, located on the second insulating layer; a third insulating layer, comprising a first portion of the second insulating layer located in the display area and the wiring area and a first portion on the second conductive layer; a third conductive layer, located on the third insulating layer, wherein the third conductive layer includes a source / drain electrode of the thin film transistor, and the source / drain electrode is connected to a source / drain region of the active layer of the thin film transistor through a hole passing through the first insulating layer, the second insulating layer, and the third insulating layer; Wherein, at least one of the first conductive layer, the second conductive layer and the third conductive layer includes the first electrical structure.

7. The display substrate according to claim 6, wherein: The third conductive layer includes the first electrical structure, the third insulating layer has a first side facing the flexible substrate, a second side facing away from the flexible substrate, and a third side of the first portion of the third insulating layer connecting the first side and the second side and adjacent to the bending region, the first electrical structure also includes a first portion of the second side covering the first portion of the third insulating layer and a second portion covering the third side.

8. The display substrate according to claim 1, further comprising: a thin film transistor located in the display area, the thin film transistor comprising an active layer located on the flexible substrate, a gate insulating layer located on the active layer, and a gate located on the gate insulating layer, wherein the gate insulating layer is a portion of a first insulating layer covering the flexible substrate, the first insulating layer has a first portion located in the display area and the wiring area, and the gate is a portion of a first conductive layer located on the first insulating layer; a second insulating layer including a first portion located on the first portion of the first insulating layer in the display area and the wiring area and on the first conductive layer; a second conductive layer, located on the second insulating layer; a third insulating layer, comprising a first portion of the second insulating layer located in the display area and the wiring area and a first portion on the second conductive layer; a third conductive layer, located on the third insulating layer, wherein the third conductive layer includes a source / drain electrode of the thin film transistor, and the source / drain electrode is connected to a source / drain region of the active layer of the thin film transistor through a hole passing through the first insulating layer, the second insulating layer, and the third insulating layer; a fourth insulating layer including a first portion located on the first portion of the third insulating layer in the display area and the wiring area; and a fourth conductive layer, located on the fourth insulating layer; Wherein, at least one of the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer includes the first electrical structure.

9. The display substrate according to claim 8, wherein: The fourth conductive layer includes the first electrical structure, the fourth insulating layer has a first side facing the flexible substrate, a second side away from the flexible substrate, and a third side of the first portion of the fourth insulating layer connecting the first side and the second side and adjacent to the bending region, the first electrical structure also includes a first portion of the second side covering the first portion of the fourth insulating layer and a second portion covering the third side.

10. The display substrate according to claim 8, wherein: The first conductive layer includes the first electrical structure, and the display substrate further includes a third electrical structure located on the third insulating layer, wherein the third electrical structure is connected to the first electrical structure via a hole passing through the third insulating layer.

11. The display substrate according to claim 8, wherein: The second conductive layer includes the first electrical structure, and the display substrate further includes a third electrical structure located on the third insulating layer, wherein the third electrical structure is connected to the first electrical structure via a hole passing through the third insulating layer.

12. The display substrate according to claim 10 or 11, wherein: At least one of the third conductive layer and the fourth conductive layer includes the third electrical structure.

13. The display substrate according to claim 8, wherein: The first insulating layer further includes a second portion located in the pad region, The second insulating layer further includes a second portion located on the second portion of the first insulating layer in the pad region; The third insulating layer further includes a second portion located on the second portion of the second insulating layer in the pad region; The fourth insulating layer further includes a second portion located on the second portion of the third insulating layer within the pad region; as well as Wherein, at least one of the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer further includes a second electrical structure.

14. The display substrate according to claim 8, wherein: The wiring includes a first wiring, a second wiring, a third wiring and a fourth wiring arranged in a direction perpendicular to the direction from the display area to the pad area, the first electrical structure includes a first sub-electrical structure, a second sub-electrical structure, a third sub-electrical structure and a fourth sub-electrical structure, and the second electrical structure includes a fifth sub-electrical structure, a sixth sub-electrical structure, a seventh sub-electrical structure and an eighth sub-electrical structure; Among them, the first conductive layer includes the first sub-electrical structure and the fifth sub-electrical structure; the second conductive layer includes the second sub-electrical structure and the sixth sub-electrical structure; the third conductive layer includes the third sub-electrical structure and the seventh sub-electrical structure; and the fourth conductive layer includes the fourth sub-electrical structure and the eighth sub-electrical structure.

15. The display substrate according to claim 1, wherein: The first portion of the wiring extends to the display area in a direction from the pad area to the display area, and the flexible substrate further includes an insulating layer located between the first flexible substrate and the second flexible substrate, wherein The insulating layer includes a first portion located within the display area and the wiring and a second portion located within the pad area, at least a portion of the first portion of the wiring is located between the first portion of the insulating layer and the second flexible substrate, and at least a portion of the third portion of the wiring is located between the second portion of the insulating layer and the second flexible substrate.

16. The display substrate according to claim 15, wherein: The first portion of the wiring includes a first sub-portion located between the first portion of the insulating layer and the second flexible substrate, a second sub-portion located between the first portion of the insulating layer and the first flexible substrate, and a third sub-portion connecting the first sub-portion and the second sub-portion, The third portion of the wiring includes a first sub-portion located between the second portion of the insulating layer and the second flexible substrate, a second sub-portion located between the second portion of the insulating layer and the first flexible substrate, and a third sub-portion connecting the first sub-portion and the second sub-portion. 17 . The display substrate of claim 15 , the second conductive layer comprising the first electrical structure connected to the first portion of the wiring through a hole passing through the first insulating layer, the second insulating layer, and the second flexible substrate.

18. A display device comprising the display substrate according to any one of claims 1 to 17.

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