Stretchable display panel and display device

Abstract

The invention discloses a stretchable display panel and a display device, the stretchable display panel comprises a supporting layer and a plurality of first pixel islands, the supporting layer comprises at least one elastic supporting strip, and the elastic supporting strip bends and extends in the plane where the supporting layer is located; the plurality of first pixel islands are located on one side of the supporting layer, the plurality of first pixel islands are arranged on the elastic supporting strips at intervals, a bent stretchable wire is connected between every two adjacent first pixel islands, and light emitting units are arranged on the first pixel islands. According to the scheme, the reliability can be ensured while the pixel density is improved.

Description

Technical Field

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

[0002] With the development of display technology, stretchable display panels have emerged. Stretchable display means that the area of ​​the display can be expanded (or compressed) under the action of tension to meet the needs of consumers in different usage scenarios.

[0003] However, the pixel density of stretchable display panels needs to be improved. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a stretchable display panel and a display device that can improve pixel density while ensuring reliability.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a stretchable display panel, including a supporting layer and a plurality of first pixel islands, the supporting layer including at least one elastic supporting bar, and the elastic supporting bar is bent and extended within the plane where the supporting layer is located; the plurality of first pixel islands are located on one side of the supporting layer, the plurality of first pixel islands are arranged on the elastic supporting bar at intervals, a curved stretchable trace is connected between two adjacent first pixel islands, and a light-emitting unit is provided on the first pixel island.

[0006] Preferably, there are multiple elastic support strips, and the multiple elastic support strips are distributed at intervals along the first direction.

[0007] Preferably, the supporting layer further comprises an elastic connector, and the elastic connector connects two adjacent elastic supporting strips.

[0008] Preferably, the stretchable display panel further comprises a second pixel island arranged on the elastic connector, and the curved stretchable traces are connected between two adjacent second pixel islands and between the second pixel island and the first pixel island.

[0009] Preferably, the elastic connecting body comprises a first elastic connecting portion, two ends of the first elastic connecting portion are respectively connected to two adjacent elastic supporting strips, and the first elastic connecting portion bends and extends within the plane where the supporting layer is located.

[0010] Preferably, the material of the first elastic connection portion is the same as that of the elastic supporting strip.

[0011] Preferably, the elastic connecting body further comprises a second elastic connecting portion, the second elastic connecting portion fills the space between two adjacent elastic supporting strips, and the elastic modulus of the second elastic connecting portion is smaller than the elastic modulus of the elastic supporting strips.

[0012] Preferably, the material of the second elastic connecting part includes styrene-ethylene / butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer or aliphatic aromatic random copolyester.

[0013] Preferably, the stretchable display panel further comprises: an elastic substrate, arranged on a side of the supporting layer away from the first pixel island.

[0014] Preferably, the elastic modulus of the elastic substrate is smaller than the elastic modulus of the elastic support strip.

[0015] Preferably, the material of the elastic substrate includes styrene-ethylene / butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer or aliphatic aromatic random copolyester.

[0016] Preferably, the material of the elastic support strip includes polydimethylsiloxane.

[0017] In order to solve the above technical problems, another technical solution adopted in the present application is: providing a stretchable display panel, including a supporting layer and a plurality of first pixel islands, the supporting layer including at least one elastic supporting bar, the elastic supporting bar including a first curved surface; the plurality of first pixel islands are located on one side of the supporting layer, the plurality of first pixel islands are arranged at intervals on the first curved surface, a curved stretchable wiring is connected between two adjacent first pixel islands, and a light-emitting unit is provided on the first pixel island.

[0018] Preferably, at least part of the stretchable wiring is attached to the first curved surface.

[0019] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a display device, comprising the stretchable display panel of any embodiment.

[0020] The beneficial effect of the present application is that, different from the prior art, the stretchable display panel provided by the present application includes at least one elastic support strip. Since the elastic support strip is curved or has a curved surface, the elastic support strip can be understood as an elastic body that can stretch in one direction. The total stretching amplitude of the elastic body is formed by superposition of two stretching types, wherein the elastic support strip itself or the first curved surface of the elastic support strip is gradually straightened from the curved state to the first stretching type, and the elastic deformation of the elastic material itself used in the elastic support strip is the second stretching type. It can be understood that the elastic body still has the stretching ability after being completely straightened. Therefore, compared with the related art, the support layer of the present application has a stronger deformation ability when stretched along the first direction, so that the adjacent two first pixel islands can be stretched to the same final spacing with a shorter initial spacing, and the pixel density of the stretchable display panel can be increased as the spacing between the first pixel islands is shortened. At the same time, under the premise of the same total stretching amplitude, as the pixel density increases, the individual stretching amount of the stretchable wiring between each two adjacent first pixel islands is correspondingly reduced, thereby reducing the probability of damage to the stretchable wiring and improving the reliability of the stretchable display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a top view of an embodiment of a stretchable display panel of the present application;

[0022] Figure 2 yes Figure 1 Sectional view along AA direction;

[0023] Figure 3a This is a schematic diagram of the structure of the elastic support strip of the present application in a non-stretched state;

[0024] Figure 3b This is a schematic diagram of the structure of the elastic support strip of the present application in a stretched state;

[0025] Figure 4 is a top view of another embodiment of the stretchable display panel of the present application;

[0026] Figure 5 is a top view of another embodiment of the stretchable display panel of the present application;

[0027] Figure 6 It is a cross-sectional view of another embodiment of the stretchable display panel of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] In order to improve the stretchability of the stretchable display panel, the pixel islands in the stretchable display panel are connected by curved stretchable wiring. In order to withstand large tensile strains, the stretchable wiring usually occupies a large space between the pixel islands, thereby reducing the pixel density (PPI, Pixel Per Inch) of the display panel. When the stretchable display panel is in the stretched state, the stretchable wiring is straightened, and the distance between the pixel islands increases, resulting in a further decrease in the pixel density of the display panel.

[0030] See also Figure 1 , Figure 1 is a top view of an embodiment of a stretchable display panel of the present application, Figure 2 yes Figure 1 Cross-sectional view along the AA direction. In the present embodiment, the stretchable display panel 10 includes a support layer 2 and a plurality of first pixel islands 3, the support layer 2 includes at least one elastic support bar 21, the elastic support bar 21 is bent and extended in the plane where the support layer 2 is located, specifically, the elastic support bar 21 is wavy, zigzag, etc., and the bending direction of the elastic support bar 21 has an extension component in the first direction (Y direction in the figure) and the second direction (X direction in the figure). The elastic support bar 21 includes two second curved surfaces 21b arranged opposite to each other, the two second curved surfaces 21b are bent synchronously, and the two sides of the first surface 21c are respectively connected to the two second curved surfaces 21b, and a plurality of first pixel islands 3 are arranged on the first surface 21c at intervals, and a curved stretchable wiring 4 is connected between two adjacent first pixel islands 3, and a light-emitting unit is provided on the first pixel island 3, wherein the first direction (Y direction in the figure) and the second direction (X direction in the figure) are substantially parallel to the plane where the support layer 2 is located. Specifically, the side surface (Y direction in the figure) of the elastic support bar 21 facing away from the first pixel island 3 is Figure 2The plane where the support layer 2 is located is defined as S (shown in FIG. 5 ), and the elastic support strip 21 extends in the plane where the first direction and the second direction are located, that is, the extension direction of the elastic support strip 21 is always basically parallel to the plane where the support layer 2 is located, and the specific angles between the first direction, the second direction and the plane where the support layer 2 is located can be within the range of ±5°. In this embodiment, the second curved surface 21b is the side surface of the elastic support strip 21, the first surface 21c is the upper surface, and the first pixel island 3 is arranged on the first surface 21c. In order to ensure that the heights of multiple first pixel islands 3 remain consistent during the stretching process, the first surface 21c is preferably a plane, and the first surfaces 21c of multiple elastic support strips 21 are arranged flush. When the elastic support strip 21 is stretched along the second direction, Figure 3a The state shown is transformed to Figure 3b In the state shown, the elastic support strip 21 is gradually straightened from the bent state on the one hand, and on the other hand, the material of the elastic support strip 21 itself undergoes elastic deformation, so that the elastic support strip 21 has a stronger deformation ability, thereby increasing the pixel density of the stretchable display panel 10, and the individual stretching amount of each stretchable trace 4 is correspondingly reduced, thereby improving the reliability of the stretchable display panel 10.

[0031] In the present application, the elastic support strip 21 is made of an elastic material. Specifically, the material of the elastic support strip 21 may include polydimethylsiloxane (PDMS). Since the elastic support strip 21 is curved, the elastic support strip 21 can be understood as an elastomer that can stretch in the second direction. The total stretching amplitude of the elastomer is formed by the superposition of two stretching types, wherein the elastic support strip 21 is gradually straightened from a curved state to form a first stretching type, and the elastic deformation of the elastic material itself used in the elastic support strip 21 is the second stretching type. It can be understood that the elastomer still has the ability to stretch after being completely straightened. It should be noted that the above two types of stretching exist simultaneously during the stretching process and should not be divided into two completely independent stretching steps. Therefore, compared with the related art, the support layer 2 of the present application has a stronger deformation ability when stretched along the second direction, so that two adjacent first pixel islands 3 can be stretched to reach the same final spacing with a shorter initial spacing, and the pixel density of the stretchable display panel 10 can increase as the spacing between the first pixel islands 3 shortens. At the same time, under the premise of the same total stretching amplitude, as the pixel density increases, the individual stretching amount of the stretchable wiring 4 between each two adjacent first pixel islands 3 is reduced accordingly, thereby reducing the probability of damage to the stretchable wiring 4 and improving the reliability of the stretchable display panel 10.

[0032] Continue reading Figure 3a and Figure 3bAt least part of the first pixel islands 3 are arranged in intervals along the first direction and along the second direction, that is, the trajectory of the arrangement of the first pixel islands 3 is also a curve consistent with the elastic support bar 21. On the one hand, the number of first pixel islands 3 per unit length can be increased, and the pixel density can be improved; on the other hand, when the elastic support bar 21 is stretched in the second direction, its bending degree is reduced, that is, the radius of curvature increases, and its width in the first direction (Y direction in the figure) is reduced, and the distance between two adjacent first pixel islands 3 on the elastic support bar 21 in the first direction is shortened accordingly, so that the stretchable display panel 10 can still maintain a high pixel density after stretching. In other embodiments, the first pixel islands 3 can also be arranged only in the second direction.

[0033] Optionally, continue to Figure 1 The number of the elastic support strips 21 is multiple, and the multiple elastic support strips 21 are arranged at intervals along the first direction. The multiple elastic support strips 21 are arranged in parallel along the first direction to expand the length of the stretchable display panel 10 in the first direction, and because there is a gap between two adjacent elastic support strips 21 of the supporting layer 2, the deformation capacity in the first direction can be increased.

[0034] Two adjacent elastic support strips 21 can be connected to each other through a variety of connection structures to form a complete support structure. In some embodiments, the support structure can be arranged in the same layer as the elastic support strips 21, that is, located in the support layer 2. Figure 4 In one embodiment shown, the support layer 2 further includes an elastic connector 22, which connects two adjacent elastic support strips 21. The elastic connector 22 is made of an elastic material, which can be the same as the elastic support strips 21 for convenient synchronous preparation. The elastic connector 22 enables the support layer 2 to also have a telescopic ability in the first direction (the Y direction in the figure).

[0035] Optionally, continue to Figure 4 The stretchable display panel 10 further includes a second pixel island 5 disposed on the elastic connector 22, and a curved stretchable trace 4 is connected between two adjacent second pixel islands 5 and between the second pixel island 5 and the first pixel island 3. Specifically, when a plurality of second pixel islands 5 are provided on the elastic connector 22, two adjacent second pixel islands 5 are connected by the stretchable trace 4, and the second pixel island 5 at the end is connected to the nearest first pixel island 3 by the stretchable trace 4. The above arrangement can further increase the pixel density of the stretchable display panel 10.

[0036] Optionally, continue to Figure 4The elastic connecting body 22 includes two ends of a first elastic connecting portion 221 spaced apart along a first direction (Y direction in the figure), the first elastic connecting portion 221 includes two third curved surfaces 22a arranged opposite to each other, the third curved surface 22a has extension components in the first direction and the second direction, the two third curved surfaces 22a are synchronously curved, and the first direction and the second direction are substantially parallel to the plane where the support layer 2 is located. In this embodiment, the first elastic connecting portion 221 is a curved structure similar to the elastic supporting strip 21, and the curved elastic supporting strip 21 and the first elastic connecting portion 221 are connected to form a mesh structure, which improves the tensile capacity while ensuring the strength of the support layer 2.

[0037] In such Figure 5 In another embodiment shown, the elastic connector 22 includes a second elastic connector 222, which is filled in the space between two adjacent elastic support strips 21, and the elastic modulus of the second elastic connector 222 is less than the elastic modulus of the elastic support strip 21. In this embodiment, the second elastic connector 222 further increases the deformation capacity of the support layer 2 by a lower elastic modulus. Specifically, the material of the second elastic connector 222 includes styrene-ethylene / butylene-styrene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SES) or aliphatic aromatic random copolyester (Ecoflex). In other embodiments, the elastic connector 22 may include a first elastic connector 221 and a second elastic connector 222 at the same time, and the second elastic connector 222 may be filled in the hollow of the mesh structure.

[0038] In other embodiments, the support structure may be disposed in a different layer from the elastic support strip 21. Figure 1 and Figure 2 , the stretchable display panel 10 also includes an elastic substrate 1, which is arranged on the side of the support layer 2 away from the first pixel island 3. Specifically, the elastic substrate 1 is a continuous film layer of the entire layer, and the elastic support strips 21 can be directly formed on the elastic substrate 1, and the elastic substrate 1 connects all the elastic support strips 21 while further providing deformation capability. Optionally, the elastic modulus of the elastic substrate 1 is less than the elastic modulus of the elastic support strips 21, and its material can specifically include styrene-ethylene / butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer or aliphatic aromatic random copolyester. In other embodiments, the elastic substrate 1 and the elastic connector 22 can be provided at the same time to improve the strength of the stretchable display panel 10.

[0039] The elastic support strip 21 of the present application can be bent in different directions. Figure 6 , Figure 6It is a cross-sectional view of another embodiment of the stretchable display panel of the present application. The stretchable display panel 10 includes a support layer 2 and a plurality of first pixel islands 3, the support layer 2 includes at least one elastic support bar 21, the elastic support bar 21 includes a first curved surface 21a, and a plurality of first pixel islands 3 are arranged on the first curved surface 21a, and the plane where the second direction (X direction in the figure) and the third direction (Z direction in the figure) are located is substantially perpendicular to the plane where the support layer 2 is located (shown in S in the figure). In this embodiment, the first curved surface 21a is the upper surface of the elastic support bar 21, that is, the plane where the curved trajectory of the elastic support bar 21 is located is a vertical plane perpendicular to the plane where the support layer 2 is located. Optionally, at least partially curved stretchable wiring 4 is fitted on the first curved surface 21a, so that the stretchable wiring 4 is curved and can be deformed with the elastic support bar 21, and the stretchable wiring 4 is supported and protected by the elastic support bar 21, ensuring reliability. In order to ensure that the height of the plurality of first pixel islands 3 remains consistent during the stretching process, the plurality of first pixel islands 3 are preferably arranged at the crest or trough of the first curved surface 21a. In this embodiment, a plurality of elastic support portions 211 continuously form a wavy elastic support strip 21. When the elastic support strip 21 is stretched along the second direction, the first curved surface 21a is gradually straightened from the bent state on the one hand, and the material of the elastic support strip 21 itself undergoes elastic deformation on the other hand, that is, the total stretching amplitude of the elastic support strip 21 is formed by the superposition of two types of stretching, so that the elastic support strip 21 has a stronger deformation ability, thereby increasing the pixel density of the stretchable display panel 10 and improving the reliability of the stretchable display panel 10. In this embodiment, a first pixel island 3 is provided on each crest of the elastic support strip 21. In other embodiments, one or more crests or troughs may be spaced between two adjacent first pixel islands 3 to increase the stretching amplitude. Figure 6 Only one elastic support bar 21 is shown in the figure. In this embodiment, the stretchable display panel 10 may also include a plurality of elastic support bars 21. The plurality of elastic support bars 21 may be formed by the elastic substrate 1, such as Figure 4 or Figure 5 In other embodiments, the structure of the elastic connector 22 connected to the elastic support strip 21 may also be similar to the structure of the elastic support strip 21, that is, the upper surface of the elastic connector 22 is a curved surface, and the plane where the two extension components of the curved surface are located is substantially perpendicular to the plane where the two extension components of the first curved surface 21a are located, and the plane where the support layer 2 is located.

[0040] The present application also provides a display device, including the stretchable display panel 10 in any of the above embodiments. The display device can specifically be human skin or a humanoid robot, etc.

[0041] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A stretchable display panel, characterized in that: include: The support layer comprises at least one elastic support strip, wherein the elastic support strip is bent and extends in the plane where the support layer is located; A plurality of first pixel islands are located on one side of the support layer. The plurality of first pixel islands are arranged at intervals on the elastic support strip. A curved stretchable wiring is connected between two adjacent first pixel islands. A light-emitting unit is provided on the first pixel island.

2. The stretchable display panel according to claim 1, characterized in that: There are multiple elastic support strips, and the multiple elastic support strips are distributed at intervals along the first direction.

3. The stretchable display panel according to claim 2, characterized in that: The support layer further comprises an elastic connector, which connects two adjacent elastic support strips; Preferably, the stretchable display panel further comprises a second pixel island arranged on the elastic connector, and the curved stretchable traces are connected between two adjacent second pixel islands and between the second pixel island and the first pixel island.

4. The stretchable display panel according to claim 3, characterized in that: The elastic connecting body comprises a first elastic connecting portion, two ends of which are respectively connected to two adjacent elastic supporting strips, and the first elastic connecting portion is bent and extended in the plane where the supporting layer is located; Preferably, the material of the first elastic connection portion is the same as that of the elastic supporting strip.

5. The stretchable display panel according to claim 3, characterized in that: The elastic connecting body further comprises a second elastic connecting portion, the second elastic connecting portion fills the space between two adjacent elastic supporting strips, and the elastic modulus of the second elastic connecting portion is smaller than the elastic modulus of the elastic supporting strips; Preferably, the material of the second elastic connecting part includes styrene-ethylene / butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer or aliphatic aromatic random copolyester.

6. The stretchable display panel according to any one of claims 1 to 5, characterized in that: Also includes: An elastic substrate, disposed on a side of the support layer away from the first pixel island; Preferably, the elastic modulus of the elastic substrate is smaller than the elastic modulus of the elastic support strip; Preferably, the material of the elastic substrate includes styrene-ethylene / butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer or aliphatic aromatic random copolyester.

7. The stretchable display panel according to claim 1, characterized in that: The material of the elastic support strip includes polydimethylsiloxane.

8. A stretchable display panel, characterized in that: include: A support layer, comprising at least one elastic support strip, wherein the elastic support strip comprises a first curved surface; A plurality of first pixel islands are located on one side of the support layer. The plurality of first pixel islands are arranged at intervals on the first curved surface. A curved stretchable wiring is connected between two adjacent first pixel islands. A light-emitting unit is provided on the first pixel island.

9. The stretchable display panel according to claim 8, characterized in that: At least part of the stretchable wiring is attached to the first curved surface.

10. A display device, characterized in that: Comprising a stretchable display panel as described in any one of claims 1-9.

Images