Patent Publication Number: US-2023140381-A1

Title: Stretchable display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial no. 110140136 filed on Oct. 28, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to a stretchable display panel. 
     Description of Related Art 
     With the increasing development of electronic technology, electronic products are constantly innovating. In order to apply electronic products in various fields, more and more attention has gradually been placed on the characteristics of stretchability, thinness, and design flexibility. That is, there has been an increasing demand that electronic products exhibit different appearances according to different applications and environments. To cope with such demand, electronic products need to be stretchable. For example, a stretchable display device may be integrated onto a spherical surface, thereby obtaining a spherical display device. 
     SUMMARY 
     The disclosure provides a stretchable display panel capable of reducing breakage after stretching. 
     At least one embodiment of the disclosure provides a stretchable display panel. The stretchable display panel includes a first stretchable film, a first transparent optical clear adhesive, a patterned organic layer, multiple light-emitting elements, and multiple wires. The first transparent optical clear adhesive is located on the first stretchable film. The patterned organic layer includes multiple first island portions and multiple first bridge portions. Adjacent first island portions of the first island portions are connected via a corresponding first bridge portion of the first bridge portions. The light-emitting elements are located above the first island portions. The first transparent optical clear adhesive is located between the light-emitting elements and the first stretchable film. The first surface of the patterned organic layer faces away from the light-emitting elements. An included angle between the first surface and the first side surface of the first island portions is greater than 90 degrees. The wires are located above the first bridge portions. 
     To make the aforementioned more comprehensible, several embodiments accompanied with drawings are described in detail as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. 
         FIG.  1 A  and  FIG.  1 B  are partial top schematic views of a stretchable display panel according to an embodiment of the disclosure. 
         FIG.  2 A  is a cross-sectional schematic view along a line a-a′ of  FIG.  1 A . 
         FIG.  2 B  is a cross-sectional schematic view along a line b-b′ of  FIG.  1 A . 
         FIG.  3 A  to  FIG.  3 G  are cross-sectional schematic views of a manufacturing method of a stretchable display panel according to an embodiment of the disclosure. 
         FIG.  4    is a top schematic view of a stretchable display panel according to an embodiment of the disclosure. 
         FIG.  5    is a cross-sectional schematic view of a stretchable display panel according to an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS 
       FIG.  1 A  and  FIG.  1 B  are partial top schematic views of a stretchable display panel according to an embodiment of the disclosure. Specifically,  FIG.  1 B  illustrates a state in which the stretchable display panel of  FIG.  1 A  is stretched along a direction of an arrow F.  FIG.  2 A  is a cross-sectional schematic view along a line a-a′ of  FIG.  1 A .  FIG.  2 B  is a cross-sectional schematic view along a line b-b′ of  FIG.  1 A .  FIG.  1 A  and  FIG.  1 B  illustrate a first stretchable film  100 , a patterned organic layer  120 , a patterned insulating structure  130 , and a light-emitting element LD, and other components are omitted and not shown. 
     Referring to  FIG.  1 A ,  FIG.  1 B ,  FIG.  2 A  and  FIG.  2 B , a stretchable display panel  10  includes the first stretchable film  100 , a first transparent optical clear adhesive  110 , the patterned organic layer  120 , multiple light-emitting elements LD, and multiple wires SL. In this embodiment, the stretchable display panel  10  further includes a patterned insulating structure  130 , a second stretchable film  140 , a second transparent optical clear adhesive  150 , and a cover layer OC. 
     The patterned organic layer  120  includes multiple first island portions TP 1  and multiple first bridge portions WP 1 . The adjacent first island portions TP 1  are connected via the corresponding first bridge portion WP 1 . A width W 1  of each of the first bridge portions WP 1  is smaller than a width W 2  of each of the first island portions TP 1 . In the embodiment of FIG.  1 A, the width W 1  of the first bridge portion WP 1  is parallel to a side of the light-emitting element LD. In the embodiment of  FIG.  1 A , the width W 2  of the first island portion TP 1  is parallel to the side of the light-emitting element LD. The first island portions TP 1  are arranged into an array along a first direction E 1  and a second direction E 2 . In at least some of the first bridge portions WP 1 , two ends of the first bridge portion WP 1  are respectively connected to two corresponding first island portions TP 1 . At least two of the first island portions TP 1  are separated by a through hole TH 1 . In this embodiment, each of the through holes TH 1  is surrounded by corresponding four first island portions TP 1  and corresponding four first bridge portions WP 1 . In this embodiment, the through hole TH 1  of the patterned organic layer  120  is dumbbell-shaped, some of the through holes TH 1  extend along the first direction E 1 , and other through holes TH 1  extend along the second direction E 2 . The through holes TH 1  extending along the first direction E 1  and the other through holes TH 1  extending along the second direction E 2  are alternately arranged, thereby facilitating the stretchability of the stretchable display panel  10 . 
     In some embodiments, the material of the patterned organic layer  120  includes polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polycarbonates (PC), polyether sulfone (PES), or polyarylate, or a combination thereof, or other suitable materials. In some embodiments, the patterned organic layer  120  may include a material that can withstand the temperature of a thin film transistor manufacturing process. In some embodiments, a thickness T 1  of the patterned organic layer  120  is 0.5 μm to 10 μm. 
     The patterned insulating structure  130  is located on the patterned organic layer  120 . In this embodiment, the patterned insulating structure  130  includes a first insulating layer PL 1 , a second insulating layer PL 2 , and a third insulating layer PL 3 , and optionally includes a first buffer layer BP 1 , a second buffer layer BP 2 , and a third buffer layer BP 3 . 
     The first insulating layer PL 1  is located above the patterned organic layer  120 . In some embodiments, the first buffer layer BP 1  is optionally provided between the first insulating layer PL 1  and the patterned organic layer  120 . 
     The second insulating layer PL 2  is located above the first insulating layer PL 1 . In some embodiments, the second buffer layer BP 2  is optionally provided between the second insulating layer PL 2  and the first insulating layer PL 1 . 
     The third insulating layer PL 3  is located above the second insulating layer PL 2 . In some embodiments, a third buffer layer BP 3  is optionally provided between the third insulating layer PL 3  and the second insulating layer PL 2 . 
     In some embodiments, the patterned insulating structure  130  includes organic and inorganic insulating materials. The forming method of the patterned insulating structure  130  includes a lithography process and an etching process. For example, the first insulating layer PL 1 , the second insulating layer PL 2 , and the third insulating layer PL 3  all include a cured photoresist material, and the first buffer layer BP 1 , the second buffer layer BP 2 , and the third buffer layer BP 3  include a cured photoresist material or an inorganic material that is patterned through etching. In other words, the patterned insulating structure  130  includes a stack of multiple cured photoresist layers and multiple inorganic layers. 
     In this embodiment, the patterned insulating structure  130  includes multiple second island portions TP 2  and multiple second bridge portions WP 2 . The adjacent second island portions TP 2  are connected via the corresponding second bridge portion WP 2 . A width W 3  of each of the second bridge portions WP 2  is smaller than a width W 4  of each of the second island portions TP 2 . In the embodiment of  FIG.  1 A , the width W 3  of the second bridge portion WP 2  is parallel to a side of the light-emitting element LD. In the embodiment of  FIG.  1 A , the width W 4  of the second island portion TP 2  is parallel to the side of the light-emitting element LD. The second island portions TP 2  are arranged into an array along the first direction E 1  and the second direction E 2 . In at least some of the second bridge portions WP 2 , two ends of the second bridge portion WP 2  are respectively connected to two corresponding second island portions TP 2 . At least two of the second island portions TP 2  are separated by a through hole TH 2 . In this embodiment, each of the through holes TH 2  is surrounded by corresponding four second island portions TP 2  and corresponding four second bridge portions WP 2 . In this embodiment, the through hole TH 2  of the patterned insulating structure  130  is dumbbell-shaped, some of the through holes TH 2  extend along the first direction E 1 , and other through holes TH 2  extend along the second direction E 2 . The through holes TH 2  extending along the first direction E 1  and the other through holes TH 2  extending along the second direction E 2  are alternately arranged, thereby facilitating the stretchability of the stretchable display panel  10 . In this embodiment, the through hole TH 2  of the patterned insulating structure  130  overlaps the through hole TH 1  of the patterned organic layer  120 , and the size of the through hole TH 2  of the patterned insulating structure  130  is larger than that of the through hole TH 1  of the patterned organic layer  120 . In other words, the area of an orthogonal projection of the patterned insulating structure  130  is smaller than the area of an orthogonal projection of the patterned organic layer  120 . 
     In this embodiment, the first insulating layer PL 1 , the first buffer layer BP 1 , the second insulating layer PL 2 , the second buffer layer BP 2 , the third insulating layer PL 3 , and the third buffer layer BP 3  of the patterned insulating structure  130  are located at the second island portion TP 2 , and the first insulating layer PL 1 , the first buffer layer BP 1 , the second insulating layer PL 2 , the second buffer layer BP 2 , the third insulating layer PL 3 , and the third buffer layer BP 3  optionally extend into the second bridge portion WP 2 . In some embodiments, a thickness of the second bridge portion WP 2  is smaller than a thickness of the second island portion TP 2 . For example, the second island portion TP 2  includes a greater number of insulating layers and/or a greater number of buffer layers than the insulating layers and/or the buffer layers of the second bridge portion WP 2 , but the disclosure is not limited thereto. In this embodiment, the second island portion TP 2  includes multiple inorganic insulating layers (i.e., the first buffer layer BP 1 , the second buffer layer BP 2 , and the third buffer layer BP 3 ), and the inorganic insulating layers do not extend into the second bridge portion WP 2  (i.e., the second bridge portion WP 2  does not include the first buffer layer BP 1 , the second buffer layer BP 2 , and the third buffer layer BP 3 ). Accordingly, the breakage of the second bridge portion WP 2  after stretching can be reduced. 
     In this embodiment, the patterned organic layer  120  has a first surface  122  and a second surface  124 , and the first surface  122  is opposite to the second surface  124 . The second surface  124  of the patterned organic layer  120  faces toward the patterned insulating structure  130 . In some embodiments, the area of a bottom surface  132  of the patterned insulating structure  130  contacting the patterned organic layer  120  is smaller than the area of the second surface  124  of the patterned organic layer  120  facing toward the patterned insulating structure  130 . In this embodiment, a width of the second bridge portion WP 2  is smaller than a width of the first bridge portion WP 1 . In some embodiments, each of the second bridge portions WP 2  is located on a corresponding first bridge portion WP 1 , and a side surface of each of the second bridge portions WP 2  deviates from a side surface of the corresponding first bridge portion WP 1 . Specifically, a distance L 1  between the second bridge portion WP 2  and a side surface of the first bridge portion WP 1  is greater than a distance L 2  between the second bridge portion WP 2  and another side surface of the first bridge portion WP 1 . In the embodiment of  FIG.  1 A , the distance L 1  and the distance L 2  are parallel to the side of the light-emitting element LD. With the second bridge portion WP 2  arranged deflectively above the first bridge portion WP 1 , stress concentration which leads to breakage of the wire SL in the second bridge portion WP 2  can be avoided. Although in this embodiment, the second bridge portion WP 2  is arranged deflectively above the first bridge portion WP 1 , the disclosure is not limited thereto. In other embodiments, the second bridge portion WP 2  may also be arranged to be aligned to the center the first bridge portion WP 1 . In other words, the distance L 1  may be optionally equal to the distance L 2 . 
     A first conductive layer M 1 , a second conductive layer M 2 , and a third conductive layer M 3  are located in the patterned insulating structure  130 . In this embodiment, the first conductive layer M 1  is located above the patterned organic layer  120  and is optionally located above the first buffer layer BP 1 . The second conductive layer M 2  is located above the first insulating layer PL 1  and is optionally located above the second buffer layer BP 2 , and the second conductive layer M 2  is optionally electrically connected to the first conductive layer M 1 . For example, a portion of the second conductive layer M 2  is electrically connected to the first conductive layer M 1  through a conductive via V 1  in the first insulating layer PL 1 . The second conductive layer M 2  and the conductive via V 1  are formed together, for example. The third conductive layer M 3  is located above the second insulating layer PL 2  and is optionally located above the third buffer layer BP 3 , and the third conductive layer M 3  is optionally electrically connected to the second conductive layer M 2 . For example, a portion of the third conductive layer M 3  is electrically connected to the second conductive layer M 2  through a conductive via V 2  in the second insulating layer PL 2 . The third conductive layer M 3  and the conductive via V 2  are formed together, for example. 
     In this embodiment, at least one of the first conductive layer M 1 , the second conductive layer M 2 , and the third conductive layer M 3  includes the wire SL. The wire SL is located above the first bridge portion WP 1  of the patterned organic layer  120 , and located in the second bridge portion WP 2  of the patterned insulating structure  130 . In some embodiments, some or all of the wires SL extend from the second bridge portion WP 2  of the patterned insulating structure  130  into the second island portion TP 2 . In other words, the wire SL extends from the above of the first bridge portion WP 1  into above of the first island portion TP 1 . 
     In this embodiment, the first conductive layer M 1 , the second conductive layer M 2 , and the third conductive layer M 3  all include the wires SL, and some of the wires SL (the wire SL of the first conductive layer MD directly contact the patterned organic layer  120 . 
     In this embodiment, openings O of the third insulating layer PL 3  overlap the third conductive layer M 3 . In other words, the openings O expose portions of the third conductive layer M 3 . Multiple electrodes E are formed in the openings O and cover the third conductive layer M 3  at the bottom of the openings O. In some embodiments, the electrode E includes a metal oxide, such as indium tin oxide, but the disclosure is not limited thereto. The electrode E may include other conductive materials suitable for protecting the portion of the third conductive layer M 3  exposed by the opening O. 
     The light-emitting element LD is located above the first island portion TP 1 . The first surface  122  of the patterned organic layer  120  faces away from the light-emitting element LD. In this embodiment, the light-emitting element LD is located above the second island portion TP 2  and is electrically connected to the electrode E through a conductive connection structure CC. In some embodiments, the conductive connection structure CC includes, for example, indium, tin, bismuth, conductive paste, a combination thereof, or other suitable materials. In some embodiments, the light-emitting element LD is placed on the electrode E by a bulk transfer process. The light-emitting element LD is electrically connected to the third conductive layer M 3  through the electrode E, and is further electrically connected to the wire SL located in the second bridge portion WP 2  of the third conductive layer M 3 , the second conductive layer M 2 , and/or the first conductive layer M 1 . In some embodiments, the light-emitting element LD includes an organic light-emitting diode, a micro light-emitting diode, or other light-emitting element. The light-emitting element LD is electrically connected to the electrodes E through, for example, eutectic bonding, conductive adhesive bonding, welding, or other similar processes. In this embodiment, light-emitting elements LD of different colors are disposed above the respective second island portions TP 2  to form color pixels. For example, a red display element, a green display element, and a blue display element are disposed above the respective second island portions TP 2 . 
     In this embodiment, multiple cover layers OC are located on the second island portions TP 2 , and each of the cover layers OC is located on a corresponding second island portion TP 2 . The cover layer OC covers and envelops the corresponding light-emitting element LD. The cover layer OC is, for example, a transparent optical clear adhesive (or transparent packing adhesive), and is suitable for protecting the light-emitting element LD. In some embodiments, a process for forming the cover layer OC includes ink jet printing or other suitable processes. 
     In some embodiments, the material of the first stretchable film  100  includes a thermoplastic polymer, such as thermoplastic polyurethane (TPU), silicone, epoxy, or other suitable materials. In some embodiments, a thickness T 2  of the first stretchable film  100  is 50 μm to 1000 μm. 
     The first transparent optical clear adhesive  110  is located on the first stretchable film  100 . The first transparent optical clear adhesive  110  is located between the light-emitting element LD and the first stretchable film  100 . In this embodiment, the first transparent optical clear adhesive  110  contacts the cover layer OC, and the first transparent optical clear adhesive  110  optionally contacts the second island portion TP 2  and the second bridge portion WP 2  of the patterned insulating structure  130 . In some embodiments, the first transparent optical clear adhesive  110  is formed on the entire surface of the first stretchable film  100 . 
     In some embodiments, the first transparent optical clear adhesive  110  is an optical clear adhesive, acrylic adhesive, UV curable adhesive, or other suitable adhesive materials. In some embodiments, the thickness of the first transparent optical clear adhesive  110  is 10 μm or more. 
     In some embodiments, the first stretchable film  100  and the first transparent optical clear adhesive  110  are in a structure with a full surface without holes. In other words, the first stretchable film  100  and the first transparent optical clear adhesive  110  overlap the through hole TH 1  of the patterned organic layer  120  and the through hole TH 2  of the patterned insulating structure  130 . In other embodiments, the first stretchable film  100  and the first transparent optical clear adhesive  110  may have a mesh structure. With the mesh structure, the stretchability of the first stretchable film  100  and the first transparent optical clear adhesive  110  can be further facilitated. 
     In this embodiment, an included angle θ 1  between the first surface  122  of the patterned organic layer  120  and a first side surface  126  of the first island portion TP 1  is greater than 90 degrees, as shown in  FIG.  2 A . In this embodiment, the included angle θ 1  between each side surface of the first island portion TP 1  and the first surface  122  is greater than 90 degrees. In some embodiments, an included angle θ 2  between the first surface  122  of the patterned organic layer  120  and a second side surface  128  of the first bridge portion WP 1  is greater than 90 degrees, as shown in  FIG.  2 B . In this embodiment, the included angle θ 2  between each side surface of the first bridge portion WP 1  and the first surface  122  is greater than 90 degrees. Since the included angle θ 1  and the included angle θ 2  are greater than 90 degrees, the area of the second surface  124  of the patterned organic layer  120  close to the light-emitting element LD is larger than the area of the first surface  122  of the patterned organic layer  120  facing away from the light-emitting element LD. 
     In this embodiment, by setting the included angle θ 1  and the included angle θ 2 , the patterned organic layer  120  can be more easily taken off from a temporary substrate (not shown in  FIG.  1 A ,  FIG.  2 A , and  FIG.  2 B ). The description of the temporary substrate is described in the following embodiments. 
     In some embodiments, the material of the second stretchable film  140  includes a thermoplastic polymer, such as thermoplastic polyurethane (TPU), silicone, epoxy, or other suitable materials. The material of the second stretchable film  140  and the material of the first stretchable film  100  may be the same as or different from each other. In some embodiments, a thickness T 3  of the second stretchable film  140  is 50 μm to 1000 μm. 
     The second transparent optical clear adhesive  150  is located on the second stretchable film  140 . The second transparent optical clear adhesive  150  is located between the patterned organic layer  120  and the second stretchable film  140 . In this embodiment, the second transparent optical clear adhesive  150  contacts the first surface  122  of the patterned organic layer  120 . In some embodiments, the entire surface of the second transparent optical clear adhesive  150  is formed on the second stretchable film  140 . 
     In some embodiments, the second transparent optical clear adhesive  150  is an optical clear adhesive, acrylic adhesive, UV curable adhesive, or other suitable adhesive materials. In some embodiments, the thickness of the second transparent optical clear adhesive  150  is 10 μm to 1000 μm. The thickness of the first transparent optical clear adhesive  110  and the thickness of the second transparent optical clear adhesive  150  may be the same as or different from each other. 
     In some embodiments, the second stretchable film  140  and the second transparent optical clear adhesive  150  are in a structure with a full surface without holes. In other words, the second stretchable film  140  and the second transparent optical clear adhesive  150  overlap the through hole TH 1  of the patterned organic layer  120  and the through hole TH 2  of the patterned insulating structure  130 . In other embodiments, the second stretchable film  140  and the second transparent optical clear adhesive  150  may have a mesh structure. With such a mesh structure, the stretchability of the second stretchable film  140  and the second transparent optical clear adhesive  150  can be facilitated. In some embodiments, the second transparent optical clear adhesive  150  and the first transparent optical clear adhesive  110  are connected to or separated from each other in the through hole TH 1  of the patterned organic layer  120 . For example, as shown in  FIG.  2 A  and  FIG.  2 B , the first transparent optical clear adhesive  110  fills into the through hole TH 1  and contacts the second transparent optical clear adhesive  150 . In other embodiments, the first transparent optical clear adhesive  110  does not fill into the through hole TH 1  of the patterned organic layer  120 , the second transparent optical clear adhesive  150  and the first transparent optical clear adhesive  110  are separated from each other, and an air gap is present between the second transparent optical clear adhesive  150  and the first transparent optical clear adhesive  110 . 
       FIG.  3 A  to  FIG.  3 G  are cross-sectional schematic views of a manufacturing method of a stretchable display panel according to an embodiment of the disclosure. It is noted here that the element reference numerals and a portion of the contents of the embodiments of  FIG.  1 A , 
       FIG.  2 A , and  FIG.  2 B  are used in the embodiment of  FIG.  3 A  to  FIG.  3 E , the same or similar reference numerals are used to denote the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portion, reference may be made to the above embodiment, and details are not described herein.  FIG.  3 A  to  FIG.  3 G  illustrate one of the through holes TH 1  and one of the through holes TH 2  of the stretchable display panel as an example, but in practice, the patterned insulating structure  130  of the stretchable display panel may include multiple through holes TH 1  and multiple through holes TH 2 . 
     Referring to  FIG.  3 A , a temporary substrate TS is formed on a carrier CS. The carrier CS is, for example, a glass carrier, a semiconductor carrier, a metal carrier, or other suitable carriers. In some embodiments, the material of the temporary substrate TS may include polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polycarbonates (PC), polyether sulfone (PES), or polyarylate, other suitable materials, or a combination of at least two of the above-mentioned materials, but the disclosure is not limited thereto. In some embodiments, a thickness T 4  of the temporary substrate TS is 5 μm to 50 μm. 
     Referring to  FIG.  3 B , an organic layer  120 ′ is formed on the temporary substrate TS. The material of the organic layer  120 ′ includes polyimide, polyethylene naphthalate, polyethylene terephthalate, polycarbonate, polyether sulfone, or polyarylate, or a combination thereof, or other suitable materials. In some embodiments, the organic layer  120 ′ and the temporary substrate TS may include materials that can withstand the temperature of a thin film transistor manufacturing process. In some embodiments, the thickness T 1  of the organic layer  120 ′ is 0.5 μm to 10 μm. 
     In some embodiments, the organic layer  120 ′ and the temporary substrate TS include the same organic material (for example, both include polyimide). Nevertheless, different elements, different groups, or different dopants may be added to the organic material to provide the organic layer  120 ′ and the temporary substrate TS with different properties. For example, the organic layer  120 ′ and the temporary substrate TS have different etch rates. In other embodiments, the organic layer  120 ′ and the temporary substrate TS include different organic materials. 
     Referring to  FIG.  3 C , the patterned insulating structure  130 , the light-emitting element LD, the cover layer OC, and wires (not shown) are formed on the organic layer  120 ′. The patterned insulating structure  130  includes the second bridge portion (not shown) and the second island portion TP 2 . 
     Referring to  FIG.  3 D , a patterned mask layer PR is formed on the organic layer  120 ′. The patterned mask layer PR is, for example, a photoresist, and the patterned mask layer PR covers the patterned insulating structure  130 , the light-emitting element LD, the cover layer OC, and the wires (not shown). In this embodiment, the patterned mask layer PR optionally envelops the side surfaces of the patterned insulating structure  130 . In other words, the patterned mask layer PR optionally fills the through hole TH 2  of the patterned insulating structure  130 . However, the patterned mask layer PR exposes a portion of the organic layer  120 ′ at the bottom of the through hole TH 2 . 
     Referring to  FIG.  3 E , an etching process is performed with the patterned mask layer PR as a mask to remove a portion of the organic layer  120 ′ and the temporary substrate TS and obtain the patterned organic layer  120  and a temporary substrate TS&#39;. The patterned organic layer  120  includes multiple through holes TH 1 . 
     In some embodiments, the etching process includes dry etching or wet etching, such as plasma etching. In some embodiments, the gas used for plasma etching includes O 2 , Ar, CF 4 , SF 6 , or other suitable gases. In some embodiments, the etch rate of the organic layer  120 ′ in the etching process is higher than the etch rate of the temporary substrate TS, so an included angle is present at a junction between the patterned organic layer  120  and the temporary substrate TS′. Specifically, a cavity H formed by etching includes the through hole TH 1  of the patterned organic layer  120  and the opening of the temporary substrate TS′ overlapping the through hole TH 1 . On a sidewall of the cavity H, an included angle α is present between a side surface of the patterned organic layer  120  and a side surface of the temporary substrate TS′. Therefore, an included angle β between the side surface and a bottom surface of the patterned organic layer  120  is greater than 90 degrees. The included angle β is the included angle θ 1  of  FIG.  2 A  or the included angle θ 2  of  FIG.  2 B . Meanwhile, an included angle γ between the side surface and a top surface of the temporary substrate TS′ is greater than 90 degrees. 
     Referring to  FIG.  3 F , the first stretchable film  100  and the first transparent optical clear adhesive  110  are bonded to the cover layer OC and selectively bonded to the patterned insulating structure  130 . The structure on the temporary substrate TS′ is peeled off from the top surface of the temporary substrate TS′ by bonding the first stretchable film  100  and the first transparent optical clear adhesive  110  to the cover layer OC. In this embodiment, since the included angle β between the side surface and the bottom surface of the patterned organic layer  120  is greater than 90 degrees, the patterned organic layer  120  can be easily peeled off from the top surface of the temporary substrate TS′. In this embodiment, the first transparent optical clear adhesive  110  does not fill into the through hole TH 1  and the through hole TH 2 , but the disclosure is not limited thereto. In other embodiments, the first transparent optical clear adhesive  110  is filled into the through hole TH 1  and the through hole TH 2 . 
     In this embodiment, the carrier CS can be removed without a laser lift off process. Therefore, the manufacturing cost is reduced. In addition, the thickness of the patterned organic layer  120  is smaller than the thickness of the temporary substrate TS′. Therefore, the overall thickness of the device is reduced by removing the temporary substrate TS′. 
     Referring to  FIG.  3 G , the second stretchable film  140  and the second transparent optical clear adhesive  150  are bonded to the patterned organic layer  120 . Accordingly, the stretchable display panel  10  is substantially completed. 
       FIG.  4    is a top schematic view of a stretchable display panel according to an embodiment of the disclosure.  FIG.  4    illustrates the patterned organic layer  120 , the patterned insulating structure  130 , the second conductive layer M 2 , the third conductive layer M 3 , and the light-emitting element LD, whereas other components are omitted. The element reference numerals and a portion of the contents of the embodiments of  FIG.  1 A ,  FIG.  2 A , and  FIG.  2 B  are used in the embodiment of  FIG.  4   , the same or similar reference numerals are used to denote the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portion, reference may be made to the above embodiment, and details are not described herein. 
     Referring to  FIG.  4   , a stretchable display panel  20  includes a first stretchable film (omitted and not shown in  FIG.  4   ), a first transparent optical clear adhesive (omitted and not shown in  FIG.  4   ), the patterned organic layer  120 , the patterned insulating structure  130 , multiple light-emitting elements LD, and multiple wires. In this embodiment, the second conductive layer M 2  and the third conductive layer M 3  include wires. In this embodiment, the wires include multiple first wires SL 1  and multiple second wires SL 2 . 
     The multiple first wires SL 1  extend along the first direction E 1  and are electrically connected to the light-emitting elements LD on the second island portions TP 2  arranged in the first direction E 1 . For example, in this embodiment, the first wire SL 1  includes a transmission portion SL 1   a  belonging to the second conductive layer M 2  and a connection portion SL 1   b  belonging to the third conductive layer M 3 . The transmission portion SL 1   a  is located in the second bridge portion WP 2  of the patterned insulating structure  130  and extends into the second island portion TP 2  of the patterned insulating structure  130 . The connection portion SL 1   b  is located in the second island portion TP 2  of the patterned insulating structure  130 , and is electrically connected to the transmission portion SL 1   a  through the conductive via V 2 . 
     In some embodiments, at least three corresponding light-emitting elements LD on each of the second island portions TP 2  are electrically connected to the same, corresponding first wire SL 1 . For example, the third insulating layer has three openings (omitted in  FIG.  4   ) overlapping the connection portion SL 1   b,  three electrodes (omitted in  FIG.  4   ) are respectively formed in the three openings. The three light-emitting elements LD are electrically connected to the connection portion SL 1   b  through the three electrodes The first wire SL 1  is, for example, suitable for transmitting a ground voltage signal or a common voltage signal. 
     The multiple second wires SL 2  extend along the second direction E 2  and are electrically connected to the light-emitting elements LD on the second island portions TP 2  arranged in the second direction E 2 . For example, in this embodiment, the second wire SL 2  includes a transmission portion SL 2   a  belonging to the second conductive layer M 2  and a connection portion SL 2   b  belonging to the third conductive layer M 3 . The transmission portion SL 2   a  is located in the second bridge portion WP 2  of the patterned insulating structure  130  and extends into the second island portion TP 2  of the patterned insulating structure  130 . The connection portion SL 2   b  is located in the second island portion TP 2  of the patterned insulating structure  130 , and is electrically connected to the transmission portion SL 2   a  through the conductive via V 2 . In this embodiment, the width of the first wire SL 1  is greater than the width of the second wire SL 2 . 
     In some embodiments, at least three corresponding light-emitting elements LD on each of the second island portions TP 2  are respectively electrically connected to at least three corresponding second wires SL 2 . For example, the third insulating layer has three openings (omitted in  FIG.  4   ) overlapping the connection portion SL 2   b,  and three electrodes (omitted in  FIG.  4   ) are respectively formed in the three openings. The three light-emitting elements LD are electrically connected to the connection portion SL 2   b  through the three electrodes. 
     It should be noted that the stretchable display panel  20  of  FIG.  4    is a passive display device, and no active elements are disposed in the patterned insulating structure  130 . However, the disclosure is not limited thereto. In other embodiments, active elements may be disposed in the patterned insulating structure of the stretchable display panel, and the stretchable display panel is an active display device. 
       FIG.  5    is a cross-sectional schematic view of a stretchable substrate according to an embodiment of the disclosure. The element reference numerals and a portion of the contents of the embodiments of  FIG.  1 A ,  FIG.  2 A , and  FIG.  2 B  are used in the embodiment of  FIG.  5   , the same or similar reference numerals are used to denote the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portion, reference may be made to the above embodiment, and details are not described herein. 
     Referring to  FIG.  5   , in this embodiment, a stretchable display panel  30  further includes an active element TFT. The active element TFT is located in a patterned insulating structure  130   a  and is electrically connected to the light-emitting element LD. 
     In this embodiment, the patterned insulating structure  130   a  includes a barrier layer BF, a gate insulating layer GI, an interlayer dielectric layer ILD, the first insulating layer PL 1 , the second insulating layer PL 2 , and the third insulating layer PL 3 . In this embodiment, the patterned insulating structure  130   a  optionally includes the first buffer layer BP 1 , the second buffer layer BP 2 , the third buffer layer BP 3 , and a fourth buffer layer BP 4 . 
     In some embodiments, the barrier layer BF, the gate insulating layer GI, the interlayer dielectric layer ILD, the first buffer layer BP 1 , the first insulating layer PL 1 , the second buffer layer BP 2 , the second insulating layer PL 2 , the third buffer layer BP 3  , the third insulating layer PL 3 , and the fourth buffer layer BP 4  include an organic or inorganic insulating material. In some embodiments, the respective thicknesses of the first insulating layer PL 1 , the second insulating layer PL 2  and the third insulating layer PL 3  are, for example, 1 μm to 5 μm, and the respective thicknesses of the first buffer layer BP 1 , the second buffer layer BP 2 , the third buffer layer BP 3 , and the fourth buffer layer BP 4  are, for example, 100 Å to 10,000 Å, but the disclosure is not limited thereto. In some embodiments, the total thickness of the barrier layer BF, the gate insulating layer GI, and the interlayer dielectric layer ILD is 0.5 μm to 5 μm, such as about 1.8 μm, but the disclosure is not limited thereto. 
     The barrier layer BF is located on the patterned organic layer  120 . A semiconductor channel layer CH is located on the barrier layer BF. The gate insulating layer GI is located on the semiconductor channel layer CH. A gate GE in the first conductive layer M 1  is located on the gate insulating layer GI and overlapped with the semiconductor channel layer CH. The interlayer dielectric layer ILD is located on the first conductive layer M 1  and the gate insulating layer GI. A drain D and a source S of the second conductive layer M 2  are located on the interlayer dielectric layer ILD, and are electrically connected to the semiconductor channel layer CH. In this embodiment, the active element TFT includes the gate G, the semiconductor channel layer CH, the drain D, and the source S. In this embodiment, the active element TFT is a top gate type thin film transistor, but the disclosure is not limited thereto. In other embodiments, the active element TFT is a bottom gate type thin film transistor or other types of thin film transistors. 
     The first buffer layer BP 1 , the first insulating layer PL 1  and the second buffer layer BP 2  are located on the second conductive layer M 2 , and the interlayer dielectric layer ILD. The third conductive layer M 3  is located on the second buffer layer BP 2 , and at least a portion of the third conductive layer M 3  is electrically connected to the active element TFT. The second insulating layer PL 2  and the third buffer layer BP 3  are located on the third conductive layer M 3  and the second buffer layer BP 2 . The fourth conductive layer M 4  is located on the third buffer layer BP 3 , and at least a portion of the fourth conductive layer M 4  is electrically connected to the third conductive layer M 3 . The third insulating layer PL 3  and the fourth buffer layer BP 4  are located on the fourth conductive layer M 4 . The electrode E is located on the fourth buffer layer BP 4 , and at least a portion of the electrode E is electrically connected to the active element TFT through the fourth conductive layer M 4  and the third conductive layer M 3 . The light-emitting element LD is electrically connected to the electrode E through the conductive connection structure CC. In some embodiments, the conductive connection structure CC includes, for example, indium, tin, bismuth, conductive paste, a combination thereof, or other suitable materials. 
     The cover layer OC is located on the light-emitting element LD. The first stretchable film  100  is bonded to the cover layer OC through the first transparent optical clear adhesive  110 . In some embodiments, the first stretchable film  100  is further bonded to the patterned insulating structure  130   a  through the first transparent optical clear adhesive  110 . The second stretchable film  140  is bonded to the patterned organic layer  120  through the second transparent optical clear adhesive  150 . 
     To sum up, in the stretchable display panel of the embodiments of the disclosure, with the included angle in the patterned organic layer being greater than 90 degrees, the patterned organic layer can be easily peeled off from the temporary substrate. Accordingly, the manufacturing cost as well as the overall device thickness can be reduced. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.