Stretchable display panels, stretchable display devices, and wearable devices

Abstract

This application relates to the field of display technology, providing a stretchable display panel, a stretchable display device, and a wearable device. The stretchable display panel includes a display area and a non-display area; the non-display area includes a first flexible area and a second flexible area, the first flexible area extending along a first direction and the second flexible area extending along a second direction, dividing the display area into multiple parts by the first flexible area and the second flexible area; both the first flexible area and the second flexible area have multiple first grooves and multiple second grooves, the first grooves and the second grooves extending in different directions, and adjacent first grooves and second grooves are staggered. This allows for easier manufacturing and lower costs.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a stretchable display panel, a stretchable display device, and a wearable device. Background Technology

[0002] OLED (Organic Light Emitting Diode) devices are considered the most promising flat panel display devices and the most likely display technology to be made into flexible displays. As flexible OLED technology matures, products using flexible OLED components are becoming increasingly diverse, exhibiting a flourishing and competitive landscape. In recent years, foldable, rollable, and flexible products have gradually entered the consumer market. Researchers are further expanding the application areas of flexible products.

[0003] Stretchability technology has become a key research focus for researchers recently. Currently, engineers primarily use island-bridge structures, where display units are concentrated on islands connected by metal traces. The main deformation of stretchable displays is concentrated on the islands with only traces. This design requires high precision in the thin-film encapsulation process. To avoid damage to the OLED during stretching, the organic layer of the thin-film encapsulation must be fabricated only on the islands. However, due to equipment limitations, this requirement is currently only theoretically feasible. Therefore, currently, stretchable products use pure inorganic encapsulation. However, because stretchable devices have a complex, uneven structure with high stress concentration, their reliability is significantly lower than that of conventional products. Summary of the Invention

[0004] A primary objective of this application is to address the issues of high stress concentration and poor reliability in existing stretchable devices, and to provide a stretchable display panel, stretchable display device, and wearable device that is easier to manufacture and has lower cost.

[0005] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0006] According to one aspect of this application, a stretchable display panel is provided, comprising: a display area and a non-display area; the non-display area includes a first flexible area and a second flexible area, the first flexible area extending along a first direction and the second flexible area extending along a second direction, the first flexible area and the second flexible area dividing the display area into multiple parts; both the first flexible area and the second flexible area are provided with multiple first grooves and multiple second grooves, the first grooves and the second grooves extending in different directions, and adjacent first grooves and second grooves being staggered.

[0007] According to an embodiment of this application, both the first groove and the second groove are provided with partitions around their outer peripheries. The partitions are either surrounding the first groove or surrounding the second groove, or the first groove or the second groove is located between the two partitions.

[0008] According to an embodiment of this application, the first groove extends in a first direction, and the second groove extends in a second direction; within the first flexible region, the length of the first groove is greater than the length of the second groove; within the second flexible region, the length of the second groove is greater than the length of the first groove.

[0009] According to an embodiment of this application, the partition includes two partitions spaced apart from each other, and the two partitions extend in parallel.

[0010] According to an embodiment of this application, the partition includes a first partition, a second partition, and a third partition that are spaced apart from each other. Among the three, the first partition has the smallest distance from the boundary of the first groove or the second groove, and the third partition has the largest distance from the boundary of the first groove or the second groove. The second partition is located between the first partition and the third partition.

[0011] According to embodiments of this application, the partition is a partition structure formed by photolithography and negative resist curing, or...

[0012] The partition is a partition structure formed by etching the metal signal line layer of the display functional layer, or...

[0013] The partition is a partition structure formed by etching the buffer layer of the display functional layer, or...

[0014] The partition is a partition structure formed by etching the substrate layer of the display functional layer.

[0015] According to an embodiment of this application, the substrate sequentially includes: a first buffer layer, a first flexible substrate layer, a second buffer layer, and a second flexible substrate layer, wherein the first trench and the second trench are at least formed in the first buffer layer.

[0016] According to an embodiment of this application, the first trench and the second trench are formed on the substrate by dry etching or laser etching.

[0017] According to an embodiment of this application, the partition member has an inverted trapezoidal cross-section, and the end of the partition member furthest from the substrate has a larger dimension.

[0018] According to an embodiment of this application, the non-display area is strip-shaped and extends in a first direction and / or a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0019] On the other hand, this application provides a stretchable display device, including the stretchable display panel as described above.

[0020] In another aspect, a wearable device is provided, including the stretchable display device as described above.

[0021] The advantages of this application's embodiments compared to the prior art are as follows:

[0022] By utilizing blind via regions formed within the non-display area, consisting of multiple first trenches and multiple second trenches, with adjacent first trenches and second trenches staggered, a stretchable and deformable flexible region is provided without affecting the structural integrity of the non-display area. These flexible regions also separate multiple display areas, thus ensuring stretchability. Because these blind via regions are formed within the non-display area, there is no need to configure signal lines, pixel structures, electrode lines, or TFT circuits within them. Therefore, the design and manufacturing precision requirements for this part are different, overcoming the problems of high stress concentration and poor reliability. It also offers the technical advantages of high structural stability and low cost.

[0023] By incorporating both conventional and non-display areas within the panel, and providing sufficient flexibility, the reliability of the display components can be guaranteed. Furthermore, depending on the product form and display content, the design area for non-blind holes can be organically integrated with the product's requirements, enhancing the customer's product experience. For example, in addition to the display unit, health sensors can be configured for health monitoring. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a top view schematic diagram of a stretchable display panel according to one embodiment.

[0027] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0028] Figure 3 yes Figure 1A magnified structural diagram at point B in the middle.

[0029] Figure 4 This is a partial cross-sectional structural diagram of the first trench of a light-emitting display device according to an embodiment.

[0030] Figure 5 This is a partial cross-sectional view of the trench structure of a light-emitting display device as shown in a top view according to an embodiment.

[0031] Figure 6 This is a partial top view of the trench structure of a light-emitting display device according to another embodiment.

[0032] Figure 7 This is a partial cross-sectional structural schematic diagram of a partition of a light-emitting display device according to another embodiment.

[0033] Figure 8 This is a partial cross-sectional structural schematic diagram of a planar partition of a light-emitting display device according to an embodiment.

[0034] Figure 9 This is a partial cross-sectional structural schematic diagram of a partition of a light-emitting display device according to another embodiment.

[0035] Figure 10 This is a partial top view of the trench structure of a light-emitting display device according to another embodiment.

[0036] Figure 11 This is a schematic diagram of the light-emitting display device applied to the first product in the embodiment.

[0037] Figure 12 This is a schematic diagram of the light-emitting display device applied to the second type of product in the embodiment. Attached Figure Description

[0039] 1. Display area; 10. Display panel; 2. Non-display area; 2A. First flexible area; 2B. Second flexible area; Y. First direction; X. Second direction; 21. First trench; 22. Second trench; 23. First partition; 24. Second partition; 25. Third partition; 11. First substrate layer; 12. First insulating layer; 13. Buffer layer; 14. Second insulating layer; 15. Insulating buffer layer; 16. Metal signal line layer; 17. First metal signal layer; 18. Second metal signal layer; 19. Third metal signal layer; 3. Display screen; 31. First display area; 32. Second display area; 33. Third display area. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In order to address the problems of stress concentration and poor reliability in existing stretchable devices, the applicant believes that, in order to improve the reliability and popularity of stretchable display panels, it is possible to consider using common processes for development instead of processes with extremely high precision requirements, and to use more flexible and replaceable technologies for fabrication. This would provide a stretchable device that is easier to produce and has a lower cost from the perspective of facilitating practical applications.

[0042] This invention relates to a stretchable flexible organic electroluminescent display device, which is particularly suitable for wearable applications, such as textiles, clothing, and decorations.

[0043] Figure 1 This is a top view schematic diagram of a stretchable display panel according to one embodiment, wherein, Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle. Figure 3 yes Figure 1 A magnified structural diagram at point B in the middle.

[0044] This application provides a stretchable display panel 10, which mainly includes a display area 1 and a non-display area 2. The non-display area 2 includes a plurality of first flexible areas 2A and a plurality of second flexible areas 2B. The first flexible areas 2A extend along a first direction Y, and the second flexible areas 2B extend along a second direction X. The first flexible areas 2A and the second flexible areas 2B divide the display area 1 into multiple parts. A plurality of first grooves 21 and a plurality of second grooves 22 are formed in both the first flexible areas 2A and the second flexible areas 2B. The first grooves 21 and the second grooves 22 extend in different directions, and adjacent first grooves 21 and second grooves 22 are staggered.

[0045] Thus, by utilizing the blind via regions formed within the non-display area 2, consisting of multiple first trenches 21 and multiple second trenches 22, with adjacent first trenches 21 and second trenches 22 staggered from each other, a stretchable and deformable flexible region is provided using the multiple first trenches 21 and multiple second trenches 22 without affecting the structural integrity of the non-display area 2. These flexible regions also separate multiple display areas, thereby ensuring stretchability. Because these blind via regions are formed within the non-display area 2, there is no need to configure signal lines, pixel structures, electrode lines, or TFT circuits within the blind via regions. Therefore, the design and manufacturing precision requirements for this part are different, thus overcoming the problems of high stress concentration and poor reliability. It also offers the technical advantages of high structural stability and low cost.

[0046] It is understood that, in a specific embodiment, the first flexible region 2A and the second flexible region 2B can be considered to extend along the warp and weft directions, respectively. Multiple first flexible regions 2A and second flexible regions 2B form a grid structure to provide stretchable clearance at the edges of multiple block-shaped display areas. The first flexible region 2A and the second flexible region 2B further include multiple first grooves 21 and multiple second grooves 22, which extend along the warp and weft directions, respectively. Furthermore, intersecting first grooves 21 and second grooves 22 do not directly intersect; a connecting section is left at the closest point to avoid completely breaking the substrate. In other words, the first flexible region 2A and the second flexible region 2B can be considered to form a textile-shaped blind hole structure area composed of multiple first grooves 21 and multiple second grooves 22. This allows for stretchable deformation in different directions, avoiding stress concentration in individual directions and preventing basic damage.

[0047] It should be understood that the textile pattern mentioned here is not limited to orthogonal straight weave textile patterns, but can also be oblique intersecting twill textile patterns, without being specifically limited.

[0048] The display panel is divided into a conventional display area 1 and a non-display area 2. The conventional display area mainly consists of an OLED display panel 10, which includes a flexible substrate, TFT switches, OLED devices, and encapsulation layers. TFT thin-film transistors are fabricated using conventional processes, including Active layer, Gate, GI, ILD, SD, PLN, AND, PDL, and PS layers. The functional layers of the OLED device are deposited using vacuum evaporation. A thin-film encapsulation layer is then fabricated on top of the deposited layers. The textile area is interspersed with the conventional display area, providing a deformation range for wearable display devices. The textile area is a non-display area within the panel, formed by creating non-through-hole trenches between pixel areas. Figure 1 The textile groove area shown is implemented horizontally and vertically as the groove area in this embodiment. Its microscopic top-view effect is as follows: Figure 2 , Figure 3 As shown, the cross-sectional effect is as follows Figure 4 As shown. The groove structure along the meridian or parallel can be as follows: Figure 2 As shown, it consists of a discontinuous arrangement of ring-shaped isolation columns, or it can be as follows: Figure 3 As shown, the woven area consists of continuous line grooves. Vertically, the woven area grooves extend to the top of the flexible substrate or to the middle of the substrate, but do not form a complete through-hole. Isolation pillars can be provided at the edges of the woven area grooves, or not, but are preferred. The advantage of providing isolation pillars is that they isolate the OLED's vapor-deposited material, preventing damage to the conventional display area during subsequent stretching and deformation. The number or type of pixels in the display area formed between the woven areas is not limited.

[0049] More specifically, both the first trench 21 and the second trench 22 are provided with partitions around their outer peripheries. The partitions surround either the first trench 21 or the second trench 22, or the first trench 21 or the second trench 22 is located between two partitions. The main function of the partitions is to facilitate effective bonding with the encapsulation layer, thereby improving the sealing performance of the encapsulation layer at the trench edges.

[0050] In this embodiment, the first groove 21 extends in the first direction Y, and the second groove 22 extends in the second direction X. Within the first flexible region 2A, the length of the first groove 21 is greater than the length of the second groove 22; within the second flexible region 2A, the length of the second groove 22 is greater than the length of the first groove 21. This is mainly because, for example, within the first flexible region 2A, the extension direction of the first groove 21 is exactly the same as the extension direction of the first flexible region 2A, thus allowing the first groove 21 to extend a long distance. In other words, the arrangement pattern of the first groove 21 and the second groove 22 is the same throughout the entire panel, which effectively controls design and manufacturing costs, while providing uniform stretchable and deformable performance for the entire display component.

[0051] Figure 4 This is a partial cross-sectional structural schematic diagram of a first trench in a light-emitting display device according to one embodiment. The partition includes two spaced-apart partitions that extend parallel to each other. The main function of the partitions is to facilitate a second effective bonding with the encapsulation layer, further improving the sealing performance of the encapsulation layer at the trench edge.

[0052] In this embodiment, the partition includes a first partition 23, a second partition 24, and a third partition 25 spaced apart from each other. The first partition 23 has the smallest boundary distance from the first trench 21 or the second trench 22, while the third partition 25 has the largest boundary distance from the first trench 21 or the second trench 22. The second partition 24 is located between the first partition 23 and the third partition 25. In other words, three partition layers can be formed, facilitating multiple effective bonding with the encapsulation layer and further improving the sealing performance of the encapsulation layer at the trench edge.

[0053] See Figure 5 This is a partial cross-sectional view of a trench in a light-emitting display device according to one embodiment. It can be seen that the first partition 23, the second partition 24, and the third partition 25 can concentrically surround the first trench 21 or the second trench 22, thus forming a multi-layered protective structure surrounding the first trench 21 or the second trench 22, thereby ensuring the sealing of the non-display area 2.

[0054] Figure 6 This is a partial top view of a trench structure for a light-emitting display device according to another embodiment. In this embodiment, the first partition 23, the second partition 24, and the third partition 25 on one side extend in a straight line, and the first partition 23, the second partition 24, and the third partition 25 on the other side also extend in a straight line, with the first trench 21 or the second trench 22 located between the two sets of partitions. This structural embodiment is mainly for cases where the first trench 21 or the second trench 22 needs to extend to the end face of the substrate.

[0055] See Figure 4 As exemplified, the partition is a partition structure cured by photolithographic negative resist. The partition has an inverted trapezoidal cross-section, with the end of the partition furthest from the substrate having a larger dimension. The substrate mainly includes a flexible first substrate layer 11 and a first insulating layer 12. This substrate integrates the display area and the non-display area; the difference in the non-display area is that it does not contain the structures required for display units such as pixel units. The formation steps of the first partition 23, the second partition 24, and the third partition 25 are as follows: first, a curable photolithographic negative resist is coated onto the first insulating layer 12 to form a curable photolithographic negative resist layer. This curable photolithographic negative resist can be thermoplastic or thermosetting, and it can be cured by heating. For example, the curable photolithographic negative resist can be a polyimide (PI) photolithographic negative resist, specifically, PIPR negative resist provided by Shanghai Toray Industries Co., Ltd.

[0056] The curable photoresist negative layer can cover the first insulating layer 12, exposing the pattern on the photomask onto the curable photoresist negative layer. The exposure area can be the region to be removed. Thus, areas on the first insulating layer 12 other than the partitions are not exposed. After development, the curable photoresist negative layer in the non-exposed areas can be removed. Therefore, on the first insulating layer 12, the curable photoresist negative layer is retained only in the partition region. Simultaneously, the partitions will have an undercut at the bottom. This undercut is due to the higher acidity at the bottom of the photoresist, resulting in a higher deprotection reaction at the bottom compared to other areas, meaning the bottom cross-section of the formed structure is smaller.

[0057] In another embodiment, Figure 7 This is a partial cross-sectional structural diagram of a partition for a light-emitting display device according to another embodiment. The partition is a partition structure formed by etching the metal signal line layer of the display functional layer. The metal signal line layer 16 of the display functional layer and the underlying insulating buffer layer 15 can cover the second insulating layer 14 of the non-display area. Then, the area outside the partition is etched away to obtain the partition structure. Thus, the partition structure is retained only within the partition area on the second insulating layer 14. As described above, in this embodiment, the metal signal line layer of the display functional layer extends to the non-display area 2. The partition formed with this metal layer structure can have better structural and chemical stability, thereby facilitating a stable connection and seal with the encapsulation layer.

[0058] Figure 8 This is a partial cross-sectional schematic diagram of a planar partition structure of a light-emitting display device according to an embodiment. The partition structure is formed by etching the substrate layer of the display functional layer. As shown in the figure, the partition structure can be considered as a partition structure formed by etching the buffer layer of the display functional layer. The partition structure described here is actually formed simultaneously in the etching steps of the first trench 21 or the second trench 22 due to the different etching ratios of the organic material of the PI substrate of the buffer layer 13 and the inorganic layer of the second insulating layer 14. That is, the second insulating layer 14 extends a longer distance towards the center of the first trench 21 or the second trench 22, thereby forming an effective partition at the edge of the buffer layer 13 in the first trench 21 or the second trench 22.

[0059] Figure 9This is a partial cross-sectional structural diagram of a partition in a light-emitting display device according to another embodiment. The partition structure is formed using different etching ratios of the metal layers in an SD (Source Drain) layer, such as titanium, aluminum, or titanium (TI / AL / TI) structure. The first metal signal layer 17, the second metal signal layer 18, and the third metal signal layer 19 of the display functional layer are shown. The first metal signal layer 17 and the third metal signal layer 19 are titanium layers with higher hardness. The area outside the partition is then etched away, resulting in a partition structure that is narrow in the middle and wide at both ends. Thus, the partition structure is retained only within the partition area on the second insulating layer 14. As described above, in this embodiment, the metal signal line layer of the display functional layer extends to the non-display area 2. The partition formed with this metal layer structure can have better structural and chemical stability, thereby facilitating a stable connection and seal with the encapsulation layer.

[0060] Figure 10 This is a partial top view of the trench structure of a light-emitting display device according to another embodiment. The first trench 21 and the second trench 22, which are interlaced, can be aligned on the same plane, that is, in the structure of a double-layer flexible substrate, the textile trenches all extend to the top of the buffer layer 13 or to the middle of the substrate. Alternatively, they can not be on the same plane, such as the warp direction extending to the top of the first substrate 11 or to the middle of the substrate, and the weft direction extending to the top of the buffer layer 13 or to the middle of the substrate.

[0061] In one aspect, this invention ensures the reliability of display components by providing a certain degree of deformability to the panel while incorporating a conventional display area and a textile area within the panel. Furthermore, by organically combining the design area of ​​non-blind apertures with product requirements according to different product forms and display content, it enhances the customer's product experience. For example, in addition to providing display functions, it can also integrate sensors for health monitoring.

[0062] On the other hand, by introducing an oriented support structure, the deformation rate and springback rate during the actual stretching process are controlled, thereby ensuring the reliability of the stretchable product.

[0063] The isolation pillar structure can be formed by selectively etching organic and inorganic materials at different ratios. As shown in the figure, by utilizing the different etching ratios of the organic material in the PI substrate and the waterproof inorganic layer, a structure with an isolation structure can be directly formed. Alternatively, inverted trapezoidal isolation pillars can be fabricated using negative adhesive, or the isolation structure can be formed by utilizing the different etching ratios of the metal layers in the SD layer (TI / AL / TI) structure. The organic and inorganic layers of the thin-film encapsulation layer are fabricated normally in the textile area.

[0064] The product provided in this application embodiment can organically combine the design area of ​​the non-blind hole with the actual product requirements according to different product forms and display content, so as to improve the customer product experience. Figure 11 This is a schematic diagram illustrating the application of the light-emitting display device in the first product in this embodiment. Figure 12 This is a schematic diagram illustrating the application of the light-emitting display device in the second product in this embodiment. The display screen shown not only has a display function but can also carry sensors to monitor and provide feedback on the user's health information.

[0065] Furthermore, to ensure the reliability of the stretchable product, a support structure can be installed on the back. This support structure can be patterned or made of a malleable material, such as a metal sheet or an elastomer, with an elastomer being preferred. The support structure is configured corresponding to the display panel. Vertically, the support structure corresponding to the display area is a complete plane, and the support structure corresponding to the textile area also has a graphic. This graphic can be the same as or different from that of the textile area, depending on the product form. Figure 11 and Figure 12 .

[0066] For example, in clothing applications, the grooved area can be evenly distributed across the entire panel area, forming a single display screen 3. In products like handbags, it can be divided into larger areas. Taking a handbag as an example, since the shape of a handbag is relatively fixed and it is not frequently subjected to crumpling or other actions, the deformation area can be minimized. Based on the usage requirements of the handbag, the overall display screen 3 can be divided into a first display area 31, a second display area 32, and a third display area 33 to display different content, such as a logo area, a function display area, and an advertising area. This expands the application areas of stretchable products and also relatively reduces the reliability requirements for stretchable products, further controlling production costs.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A stretchable display panel, characterized by, The display panel comprises a display area and a non-display area; The non-display area comprises a first flexible area and a second flexible area, the first flexible area extends along a first direction, and the second flexible area extends along a second direction, the display area is divided into multiple parts by the first flexible area and the second flexible area; the first flexible area and the second flexible area are both provided with a plurality of first grooves and a plurality of second grooves, the first grooves and the second grooves extend in different directions, and adjacent first grooves and second grooves are staggered with each other; The back of the display panel is provided with a support structure, and the first grooves and the second grooves penetrate to above the flexible substrate or the middle position of the substrate. The first grooves and the second grooves are both provided with a partition piece, the partition piece surrounds the first grooves or the second grooves, or the first grooves or the second grooves are between the two partition pieces. The first grooves extend along the first direction, and the second grooves extend along the second direction; wherein the plurality of first grooves and the plurality of second grooves extend along the warp direction and the weft direction respectively; in the first flexible area and the second flexible area, a woven blind hole structure area is formed by the plurality of first grooves and the plurality of second grooves; in the first flexible area, the length of the first grooves is greater than the length of the second grooves; in the second flexible area, the length of the second grooves is greater than the length of the first grooves.

2. The stretchable display panel of claim 1, wherein, The partition piece comprises two partition pieces spaced from each other, and the two partition pieces extend in parallel; and / or The partition piece comprises a plurality of partition columns which do not extend in connection, or the partition piece comprises a partition column which extends in connection.

3. The stretchable display panel of claim 1, wherein, The partition piece comprises a first partition piece, a second partition piece and a third partition piece which are spaced from each other, among the three, the first partition piece is closest to the boundary of the first grooves or the second grooves, among the three, the third partition piece is farthest from the boundary of the first grooves or the second grooves, and the second partition piece is located between the first partition piece and the third partition piece.

4. The stretchable display panel of claim 1, wherein, The partition piece is a partition structure formed by photolithography and negative gel curing, or The partition piece is a partition structure formed by etching a metal signal line layer of a display functional layer, or The partition piece is a partition structure formed by etching a buffer layer of a display functional layer, or The partition piece is a partition structure formed by etching a substrate layer of a display functional layer.

5. The stretchable display panel of claim 1, wherein, The substrate of the display panel comprises in sequence: a first substrate layer, a first insulating layer, a buffer layer and a second insulating layer, and the first grooves and the second grooves are at least formed in the first substrate layer.

6. The stretchable display panel of claim 1, wherein, The first grooves and the second grooves are formed on the substrate by dry etching or laser etching.

7. The stretchable display panel according to any one of claims 1 to 6, wherein, The partition piece is a structure with an inverted trapezoidal cross section, and the size of the end of the partition piece away from the substrate is larger.

8. A stretchable display device, characterized by, The stretchable display panel comprises any one of the display panels according to claims 1 to 7.

9. A wearable device, comprising: The stretchable display device comprises the stretchable display panel according to claim 8.

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