Stretchable display device

Abstract

Stretchable display device. According to one aspect of the present disclosure, a stretchable display device includes: a base substrate including a display area and a non-display area; a plurality of first substrates disposed on the display area and having a modulus greater than that of the base substrate; at least one transistor formed on each of the plurality of first substrates; a planarization layer covering the at least one transistor; at least one light-emitting diode electrically connected to the at least one transistor and formed on the planarization layer; and a plurality of bonding patterns attached to each of the at least one light-emitting diode, wherein the planarization layer includes at least one first depression pattern formed on a side of the at least one light-emitting diode, thereby suppressing deterioration of elongation.

Description

Technical Field

[0001] The present disclosure relates to a stretchable display device, and more particularly, to a stretchable display device having a pixel structure with suppressed elongation degradation. Background Art

[0002] As display devices for monitors of computers, televisions, or cellular phones, there are organic light emitting display devices (OLEDs) that are self-light emitting devices and liquid crystal display devices (LCDs) that require a separate light source.

[0003] The application range of the display device is diversified to personal digital assistants and monitors of computers and televisions, and a display device having a large display area and reduced size and weight is being studied.

[0004] Furthermore, recently, a stretchable display device, which is stretchable in a specific direction and changeable in various forms by forming a display unit and a conductive line on a flexible substrate such as plastic as a flexible material, is receiving attention as a next-generation display device. Summary of the invention

[0005] An object to be achieved by the present disclosure is to provide a stretchable display device capable of reducing the degradation of elongation.

[0006] Another object to be achieved by the present disclosure is to provide a stretchable display device, which can reduce driving failure of a light emitting diode.

[0007] The objects of the present disclosure are not limited to the above objects, and other objects not mentioned above can be clearly understood by those skilled in the art from the following description.

[0008] According to one aspect of the present disclosure, a stretchable display device includes: a base substrate, the base substrate including a display area and a non-display area; a plurality of first substrates, the plurality of first substrates are arranged on the display area and have a modulus greater than that of the base substrate; at least one transistor, the at least one transistor is formed on each of the plurality of first substrates; a planarization layer, the planarization layer covers the at least one transistor; at least one light emitting diode, the at least one light emitting diode is electrically connected to the at least one transistor and formed on the planarization layer; and a plurality of bonding patterns, the plurality of bonding patterns are attached to each of the at least one light emitting diode, wherein the planarization layer includes at least one first sink pattern formed on a side of the at least one light emitting diode, thereby suppressing degradation of elongation.

[0009] According to another aspect of the present disclosure, a stretchable display device includes: a soft substrate capable of being stretched; a plurality of rigid substrates, which are arranged on the soft substrate in a manner spaced apart from each other; a plurality of sub-pixels, which are defined on the plurality of rigid substrates and include light-emitting diodes attached by an adhesive layer; a plurality of first recessed patterns, which are formed on sides of the plurality of sub-pixels; at least one second recessed pattern, which connects the plurality of first recessed patterns; and a third recessed pattern, which surrounds the plurality of sub-pixels.

[0010] Additional details of exemplary embodiments are included in the detailed description and the accompanying drawings.

[0011] According to the present disclosure, when a light emitting diode is formed, an adhesive material that reduces elongation is suppressed so as not to overflow onto a soft substrate, thereby suppressing deterioration in elongation of a stretchable display device.

[0012] According to the present disclosure, the adhesive material does not penetrate into the side surface of the light emitting diode to suppress malfunction of the light emitting diode.

[0013] The effects according to the present disclosure are not limited to the contents of the above examples, and more various effects are included in this specification.

[0014] Note 1. A stretchable display device, comprising:

[0015] a base substrate, the base substrate comprising a display area and a non-display area adjacent to the display area;

[0016] a plurality of first substrates disposed on the display area and having a modulus greater than that of the base substrate;

[0017] at least one transistor formed on each of the plurality of first substrates;

[0018] a planarization layer on the at least one transistor;

[0019] at least one light emitting diode electrically connected to the at least one transistor and formed on the planarization layer; and

[0020] a plurality of bonding patterns on the planarization layer and attached to each of the at least one light emitting diode,

[0021] The planarization layer includes at least one first depressed pattern formed on a side of at least one light emitting diode.

[0022] Note 2. The stretchable display device according to Note 1,

[0023] wherein the conductive balls are dispersed in the plurality of bonding patterns, and

[0024] A width of each of the at least one first depression pattern is greater than a diameter of each of the conductive balls.

[0025] Note 3. The stretchable display device according to Note 1,

[0026] wherein each of the at least one light emitting diode comprises a first electrode and a second electrode,

[0027] The plurality of adhesive patterns include a first adhesive pattern attached to the first electrode and a second adhesive pattern attached to the second electrode, and

[0028] The planarization layer further includes at least one second depressed pattern formed between the first adhesive pattern and the second adhesive pattern.

[0029] Note 4. The stretchable display device according to Note 3,

[0030] Wherein, the at least one first depressed pattern is connected to the at least one second depressed pattern.

[0031] Note 5. The stretchable display device according to Note 3,

[0032] The conductive balls are dispersed in the plurality of bonding patterns, and the width of each of the at least one second recessed pattern is greater than the diameter of each of the conductive balls.

[0033] Note 6. The stretchable display device according to Note 1,

[0034] Each of the plurality of first substrates includes at least one third depressed pattern, and the at least one third depressed pattern is formed in a region where the planarization layer is not disposed.

[0035] Note 7. The stretchable display device according to Note 6,

[0036] Wherein, the at least one third depressed pattern surrounds the plurality of first substrates.

[0037] Supplement 8. The stretchable display device according to Supplement 1,

[0038] The side surface of the planarization layer has a slope, and at least one fourth depressed pattern is formed on the side surface of the planarization layer.

[0039] Note 9. The stretchable display device according to Note 1,

[0040] Wherein, the side surface of the planarization layer extends in one direction, and at least one fourth depressed pattern extends in the one direction.

[0041] Note 10. The stretchable display device according to Note 1, further comprising:

[0042] At least one dam is on the planarization layer, the at least one dam surrounding the at least one light emitting diode.

[0043] Note 11. The stretchable display device according to Note 10,

[0044] Wherein, the height of the at least one dam is lower than the height of the at least one light emitting diode.

[0045] Note 12. The stretchable display device according to Note 10,

[0046] Each of the at least one dam comprises a plurality of sub-dams having the same height.

[0047] Note 13. The stretchable display device according to Note 10,

[0048] Each of the at least one dam includes a plurality of sub-dams having different heights, and a sub-dam disposed outside among the plurality of sub-dams has a maximum height.

[0049] Note 14. The stretchable display device according to Note 1, further comprising:

[0050] an auxiliary buffer layer, the auxiliary buffer layer being formed between the plurality of first substrates and the planarization layer,

[0051] The auxiliary buffer layer includes at least one fifth depressed pattern formed in a region where the planarization layer is not disposed.

[0052] Note 15. The stretchable display device according to Note 14, wherein the at least one fifth depressed pattern surrounds the auxiliary buffer layer.

[0053] Note 16. A stretchable display device, comprising:

[0054] A soft substrate capable of stretching;

[0055] a plurality of rigid substrates, the plurality of rigid substrates being arranged on the soft substrate in a manner of being spaced apart from each other;

[0056] a plurality of sub-pixels defined on the plurality of rigid substrates and comprising light emitting diodes attached by an adhesive layer of the stretchable display device;

[0057] a plurality of first sunken patterns, the plurality of first sunken patterns being formed on sides of the plurality of sub-pixels;

[0058] at least one second depressed pattern, the at least one second depressed pattern connecting the plurality of first depressed patterns; and

[0059] A third depressed pattern surrounds the plurality of sub-pixels.

[0060] Note 17. The stretchable display device according to Note 16, further comprising:

[0061] a planarization layer disposed on the plurality of rigid substrates and forming the light emitting diodes on an upper surface thereof,

[0062] Wherein, the plurality of first recessed patterns and the at least one second recessed pattern are formed on the planarization layer.

[0063] Note 18. The stretchable display device according to Note 17,

[0064] The side surface of the planarization layer has a slope, and

[0065] At least one fourth depressed pattern is formed on the side surface of the planarization layer.

[0066] Note 19. The stretchable display device according to Note 17,

[0067] The third depressed pattern is formed in a region of the plurality of rigid substrates where the planarization layer is not provided.

[0068] Note 20. The stretchable display device according to Note 16, further comprising:

[0069] At least one dam surrounds the plurality of sub-pixels.

[0070] Note 21. The stretchable display device according to Note 20,

[0071] Wherein, the height of the at least one dam is lower than the height of the light emitting diode.

[0072] Note 22. The stretchable display device according to Note 20,

[0073] wherein each of the at least one dam comprises a plurality of sub-dams having different heights, and

[0074] A sub-dam adjacent to the sub-pixels among the plurality of sub-dams has a low height.

[0075] Note 23. The stretchable display device according to Note 17, further comprising:

[0076] an auxiliary buffer layer, the auxiliary buffer layer being formed between the plurality of rigid substrates and the planarization layer,

[0077] Wherein, the fifth recessed pattern is disposed at a peripheral region of the auxiliary buffer layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0079] Figure 1 is an exploded perspective view of a stretchable display device according to an embodiment of the present disclosure;

[0080] Figure 2 is an enlarged plan view of a stretchable display device according to an exemplary embodiment of the present disclosure;

[0081] Figure 3 yes Figure 2 A schematic cross-sectional view of a sub-pixel of ;

[0082] Figure 4 is a plan view showing one pixel of a stretchable display device according to an exemplary embodiment of the present disclosure;

[0083] Figure 5 is along Figure 4 A cross-sectional view taken along line V-V';

[0084] Figure 6 is a plan view showing one pixel of a stretchable display device according to another exemplary embodiment of the present disclosure;

[0085] Figure 7 is along Figure 6 A cross-sectional view taken along line VII-VII';

[0086] Figure 8 is a plan view showing one pixel of a stretchable display device according to still another exemplary embodiment of the present disclosure;

[0087] Fig. 9 is along Figure 8 A cross-sectional view taken along line IX-IX';

[0088] Fig.10 is a plan view showing one pixel of a stretchable display device according to still another exemplary embodiment of the present disclosure;

[0089] Fig.11A and Fig. 11B is along Fig.10 A cross-sectional view taken along line XI-XI';

[0090] Fig.12 is a plan view showing one pixel of a stretchable display device according to still another exemplary embodiment of the present disclosure; and

[0091] Fig.13 is along Fig.12 A cross-sectional view taken along line XIII-XIII'. DETAILED DESCRIPTION

[0092] By referring to the exemplary embodiments described in detail below and the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving the advantages and features will become clear. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. Exemplary embodiments are provided only by way of example so that those skilled in the art can fully understand the disclosure of the present disclosure and the scope of the present disclosure. Therefore, the present disclosure will only be limited by the scope of the appended claims.

[0093] The shapes, sizes, ratios, angles, quantities, etc. shown in the accompanying drawings for describing the exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Throughout the specification, similar reference numerals generally represent similar elements. In addition, in the following description of the present disclosure, detailed descriptions of known related technologies may be omitted to avoid making the subject matter of the present disclosure unclear unnecessarily. Terms such as "including", "having" and "consisting of..." used herein are generally intended to allow the addition of other components unless the term is used together with the term "only". Unless otherwise expressly stated, any reference to the singular may include the plural.

[0094] Even if not explicitly stated, components are interpreted as including normal margins of error.

[0095] When terms such as “on,” “over,” “lower,” and “next” are used to describe the positional relationship between two parts, unless these terms are used with the terms “immediately,” “just,” or “directly,” one or more components may be located between the two components.

[0096] When an element or layer is referred to as being “on” another element or layer, the other layer or element can be directly disposed on the other element or interposed therebetween.

[0097] Although the terms "first", "second", etc. are used to describe various components, these components are not limited to these terms. These terms are only used to distinguish one component from other components. Therefore, in the technical concept of the present disclosure, the first component to be mentioned below may be the second component.

[0098] Like reference numerals generally refer to like elements throughout the specification.

[0099] The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present disclosure is not limited to the illustrated sizes and thicknesses of the components.

[0100] The features of the various embodiments of the present disclosure may be partially or completely bonded or combined with each other, and may be technically interlocked and operated in various ways, and these embodiments may be performed independently or in association with each other.

[0101] Hereinafter, a stretchable display device according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0102] <Stretchable Display Device>

[0103] A stretchable display device may be referred to as a display device that can display an image even if the display device is bent or extended. Compared with a general display device of the prior art, a stretchable display device may have high flexibility. Therefore, the shape of the stretchable display device may be freely changed according to the operation of a user to bend or extend the stretchable display device. For example, when a user holds the end of the stretchable display device to pull the stretchable display device, the stretchable display device may be extended under the force of the user. Alternatively, when a user sets the stretchable display device on an uneven wall surface, the stretchable display device may be set to bend according to the shape of the surface of the wall. In addition, when the force applied by the user is removed, the stretchable display device may return to its original shape.

[0104] Figure 1 is an exploded perspective view of a stretchable display device according to an embodiment of the present disclosure.

[0105] Reference Figure 1 , the stretchable display device 100 includes: a base substrate DS, a plurality of first substrates ST1, a plurality of second substrates ST2, a plurality of connection substrates CS, a chip on film (COF) 140, a printed circuit board PCB and an upper substrate US.

[0106] The base substrate DS is a substrate that supports and protects the multiple components of the stretchable display device 100. The base substrate DS, which is a soft substrate or a flexible substrate, may be made of a bendable or stretchable insulating material. For example, the base substrate DS may be formed of a silicone rubber such as polydimethylsiloxane (PDMS) or an elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE), and thus has flexibility. However, the material of the base substrate DS is not limited thereto.

[0107] The base substrate DS is a soft substrate so as to reversibly expand and contract. In addition, the elastic modulus of the base substrate can be from several MPa to several hundred MPa, for example, from 0.5 MPa to 1 MPa. In addition, the ductile fracture rate of the base substrate DS can be 100% or more. Here, the ductile fracture rate refers to the extension distance when the object to be stretched breaks or ruptures. That is, the ductile fracture rate is defined as the percentage of the length of the original object when the object is stretched sufficiently so that it is considered to be broken to the length of the stretched object. For example, if the length of the object (e.g., the base substrate DS) is 100 cm when the object is not stretched, the object reaches a length of 110 cm when the object is stretched enough to break or rupture, and then the object is stretched to 110% of its original length. In this case, the ductile fracture rate of the object is 110%. This number can therefore also be called the ductile fracture rate because it is the ratio of the stretched length as the numerator when the fracture occurs to the original upward stretched length as the denominator.

[0108] An object is considered damaged when it no longer functions properly in a structure or circuit. For example, a wire as a conductor is considered broken when its ability to carry current is sufficiently reduced to operate within the circuit specification. Therefore, in some embodiments, it may not be necessary to completely disconnect the wire for it to be considered broken, and minor stresses at the connection ends, minor cracks, slight shifts in the position of the wire, or other movements that cause it to no longer function within its intended function will be considered broken wires. If an insulator is stretched sufficiently that it no longer provides the amount of insulation required by the structure or circuit, it is considered broken. In some embodiments, fracture will also include inelastic stretching, where the object has been stretched sufficiently that it does not return to its original length and / or shape when the object is no longer stretched. The thickness of the base substrate DS can be 10μm to 1mm, but is not limited to this.

[0109] The base substrate DS may have a display area AA and a non-display area NA adjacent to the display area AA.

[0110] The display area AA is an area where an image is displayed in the stretchable display device 100 and a display element and various driving elements for driving the display element are arranged in the display area AA. The display area AA may include a plurality of pixels including a plurality of sub-pixels. The plurality of pixels are arranged in the display area AA and include a plurality of display elements. The plurality of sub-pixels may be connected to various wires, respectively. For example, the plurality of sub-pixels may be connected to various wires such as a gate line, a data line, an emission signal line, a high potential power line, a low potential power line, a reference voltage line, and a compensation signal line.

[0111] The non-display area NA is adjacent to the display area AA. The non-display area NA is adjacent to the display area AA to surround the display area AA. In the non-display area NA, no image is displayed, and a conductive line and a circuit unit may be formed. For example, in the non-display area NA, a plurality of pads may be provided and the pads may be respectively connected to a plurality of sub-pixels of the display area AA.

[0112] A plurality of first substrates ST1 and a plurality of second substrates ST2 are disposed on the base substrate DS. The plurality of first substrates ST1 may be disposed in the display area AA of the base substrate DS, and the plurality of second substrates ST2 may be disposed in the non-display area NA of the base substrate DS. Figure 1 In the embodiment, the plurality of second substrates ST2 are disposed at the upper side and the left side in the non-display area NA, but are not limited thereto, and the plurality of second substrates ST2 may be disposed in any area of ​​the non-display area NA.

[0113] The plurality of first substrates ST1 and the plurality of second substrates ST2 are rigid substrates and are spaced apart from each other to be independently disposed on the base substrate DS. The plurality of first substrates ST1 and the plurality of second substrates ST2 may be more rigid than the base substrate DS. That is, the base substrate DS may have a greater flexibility than the plurality of first substrates ST1 and the plurality of second substrates ST2, and the plurality of first substrates ST1 and the plurality of second substrates ST2 may have a greater rigidity than the base substrate DS.

[0114] The plurality of first substrates ST1 and the plurality of second substrates ST2 as rigid substrates may be formed of a plastic material having flexibility, and may be formed of, for example, polyimide (PI), polyacrylate, or polyacetate. In this case, the plurality of first substrates ST1 and the plurality of second substrates ST2 may be formed of the same material, but are not limited thereto and may be formed of different materials.

[0115] The modulus of the plurality of first substrates ST1 and the plurality of second substrates ST2 may be higher than the modulus of the base substrate DS. The modulus is an elastic modulus, which indicates the ratio of stress applied to the substrate to strain. The higher the modulus, the higher the hardness. Therefore, compared with the base substrate DS, the plurality of first substrates ST1 and the plurality of second substrates ST2 may be a plurality of rigid substrates having greater rigidity. The modulus of the plurality of first substrates ST1 and the plurality of second substrates ST2 may be 1000 times the modulus of the base substrate DS, but is not limited thereto. For example, depending on the transparency, the elastic modulus of the plurality of first substrates ST1 and the plurality of second substrates ST2 may be 2GPa to 9GPa. More specifically, when the plurality of first substrates ST1 and the plurality of second substrates ST2 are transparent, the elastic modulus is 2GPa, and when the plurality of first substrates ST1 and the plurality of second substrates ST2 are opaque, the elastic modulus is 9GPa.

[0116] The COF 140 is a film in which various components are disposed on a base film 141 having flexibility, and provides signals to a plurality of sub-pixels of the display area AA. The COF 140 may be bonded to a plurality of pads of a plurality of second substrates ST2 disposed in the non-display area NA, and provide a power supply voltage, a data voltage, or a gate voltage to a plurality of sub-pixels of the display area AA through the pads. The COF 140 includes a base film 141 and a driving IC 142. In addition, various components may be additionally disposed thereon.

[0117] The base film 141 is a layer supporting the driving IC 142 of the COF 140. The base film 141 may be formed of an insulating material, and, for example, may be formed of an insulating material having flexibility.

[0118] The driver IC 142 is a component that processes data for displaying an image and a driving signal for processing the data. Figure 1 , although it is shown that the driving IC 142 is mounted by the COF 140 technology, it is not limited thereto, and the driving IC 142 may be mounted by a chip on glass (COG) or a tape carrier package (TCP).

[0119] exist Figure 1 In the embodiment, one second substrate ST2 is disposed in the non-display area NA at the upper side of the display area AA in a manner corresponding to one row of first substrates ST1 disposed in the display area, and one COF 140 is disposed for one second substrate ST2, but is not limited thereto. That is, one second substrate ST2 and one COF 140 may be disposed to correspond to a plurality of rows of first substrates ST1.

[0120] A control unit such as an IC chip or a circuit unit may be mounted on the printed circuit board PCB. In addition, on the printed circuit board PCB, a memory or a processor may also be mounted. The printed circuit board PCB is a component that transmits a signal for driving the display element from the controller to the display element. Figure 1 In the description, use of one printed circuit board PCB is described, but the number of printed circuit boards PCB is not limited.

[0121] In the following, reference will be made to Figure 2 and Figure 3 The stretchable display device 100 according to an exemplary embodiment of the present disclosure is described in more detail.

[0122] <Plane and cross-sectional structure>

[0123] Figure 2 is an enlarged plan view of a stretchable display device according to an exemplary embodiment of the present disclosure. Figure 3 yes Figure 2 For ease of description, reference will be made to Figure 1 A stretchable display device 100 according to an exemplary embodiment of the present disclosure is described together.

[0124] Reference Figure 2 and Figure 3 , the stretchable display device 100 includes: a base substrate DS, a plurality of first substrates ST1 , a plurality of connection substrates CS, a plurality of connection lines 120 , a plurality of pads 130 , a transistor 150 , and an LED 160 .

[0125] Reference Figure 1 and Figure 2 , a plurality of first substrates ST1 are disposed on the base substrate DS in the display area AA. The plurality of first substrates ST1 are spaced apart from each other to be disposed on the base substrate DS. Figure 1 and Figure 2 As shown, a plurality of first substrates ST1 may be disposed in a matrix form on the base substrate DS, but is not limited thereto.

[0126] Reference Figure 1 and Figure 2 , a plurality of sub-pixels SPX configuring a plurality of pixels PX are arranged on a plurality of first substrates ST1, and a gate driver GD is installed on a second substrate ST2 located on the left side of the display area AA among a plurality of second substrates ST2. When various components are manufactured on the first substrate ST1, the gate driver GD can be formed on the second substrate ST2 in the form of a gate in plate (GIP). Therefore, various circuit configurations of the gate driver GD such as various transistors, capacitors, and wires can be arranged on the plurality of second substrates ST2. However, the gate driver GD is not limited thereto and can be installed in the form of a chip on film (COF). In addition, a plurality of second substrates ST2 are also arranged in a non-display area NA located on the right side of the display area AA, and the gate driver GD can also be installed on a plurality of second substrates ST2 located on the right side of the display area AA.

[0127] Reference Figure 1 , the size of the plurality of second substrates ST2 may be larger than the size of the plurality of first substrates ST1. Specifically, the size of each of the plurality of second substrates ST2 may be larger than the size of each of the plurality of first substrates ST1. As described above, on each of the plurality of second substrates ST2, a gate driver GD is disposed. For example, a first-level STG of the gate driver GD may be disposed on each of the plurality of second substrates ST2. Therefore, the area occupied by various circuit configurations of the first-level STG configuring the gate driver GD may be relatively larger than the area of ​​the first substrate ST1 on which the pixels PX are disposed. As a result, the size of each of the plurality of second substrates ST2 may be larger than the size of each of the plurality of first substrates ST1.

[0128] Reference Figure 1 and Figure 2 , the plurality of connection substrates CS may be disposed between the plurality of first substrates ST1, between the plurality of second substrates ST2, or between the plurality of first substrates ST1 and the plurality of second substrates ST2. The plurality of connection substrates CS may be substrates that connect adjacent first substrates ST1, adjacent second substrates ST2, or first substrates ST1 and second substrates ST2 adjacent to each other. The plurality of connection substrates CS may be formed simultaneously and integrally of the same material as the plurality of first substrates ST1 or the plurality of second substrates ST2, but is not limited thereto.

[0129] Reference Figure 2 , the plurality of connection substrates CS have a curved shape on a flat surface. Figure 2 As shown, the plurality of connection substrates CS may have a sine wave shape. However, the shape of the plurality of connection substrates CS is not limited thereto, and for example, the plurality of connection substrates CS may extend in a zigzag shape, or may be formed into various shapes such as a shape extending by connecting a plurality of rhombus-shaped substrates at the vertices. In addition, Figure 2 The number and shape of the plurality of connection substrates CS shown are exemplary, and the number and shape of the plurality of connection substrates CS may vary according to design.

[0130] Reference Figure 3 , a buffer layer 112 is disposed on the plurality of first substrates ST1. The buffer layer 112 is formed on the plurality of first substrates ST1 to protect the various components of the stretchable display device 100 from moisture H2O and oxygen O2 penetrating from the outside of the base substrate DS and the plurality of first substrates ST1. The buffer layer 112 may be configured of an insulating material, and for example, by a single layer or double layer configuration of an inorganic layer formed of silicon nitride (SiNx), silicon oxide (SiOx), and silicon oxynitride (SiON). However, depending on the structure or characteristics of the stretchable display device 100, the buffer layer 112 may be omitted.

[0131] The buffer layer 112 may be formed only in the region where the base substrate DS overlaps with the plurality of first substrates ST1 and the plurality of second substrates ST2. As described above, the buffer layer 112 may be formed of an inorganic material so that the buffer layer 112 may be easily broken or damaged in the process of extending the stretchable display device 100. In this case, the buffer layer 112 is not formed in the region between the plurality of first substrates ST1 and the plurality of second substrates ST2, but is patterned to have the shape of the plurality of first substrates ST1 and the plurality of second substrates ST2 to be disposed only above the plurality of first substrates ST1 and the plurality of second substrates ST2. In other words, the buffer layer 112 may not be formed on the plurality of connection substrates CS. Therefore, in the stretchable display device 100 according to the exemplary embodiment of the present disclosure, the buffer layer 112 is formed only in the region overlapping with the plurality of first substrates ST1 and the plurality of second substrates ST2 as rigid substrates. Therefore, even if the stretchable display device 100 is bent or extended to deform, damage to the buffer layer 112 may be suppressed.

[0132] Reference Figure 3 , a transistor 150 including a gate 151 , an active layer 152 , a source 153 and a drain 154 is formed on the buffer layer 112 .

[0133] First, refer to Figure 3 , the active layer 152 is disposed on the buffer layer 112. For example, the active layer 152 may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or an organic semiconductor.

[0134] The gate insulating layer 113 is disposed on the active layer 152. The gate insulating layer 113 is a layer for electrically insulating the gate electrode 151 from the active layer 152, and may be formed of an insulating material. For example, the gate insulating layer 113 may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) as an inorganic material or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto.

[0135] The gate 151 is disposed on the gate insulating layer 113. The gate 151 is disposed to overlap the active layer 152. The gate 151 may be any one of various metal materials (e.g., any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu)) or an alloy of two or more of these metal materials, or a multilayer thereof, but is not limited thereto.

[0136] The interlayer insulating layer 114 is disposed on the gate electrode 151. The interlayer insulating layer 114 is a layer that insulates the gate electrode 151 from the source electrode 153 and the drain electrode 154, and may be formed of an inorganic material similar to the buffer layer 112. For example, the interlayer insulating layer 114 may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) as an inorganic material or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto.

[0137] The source electrode 153 and the drain electrode 154 contacting the active layer 152 are disposed on the interlayer insulating layer 114. The source electrode 153 and the drain electrode 154 are disposed on the same layer in a manner spaced apart from each other. The source electrode 153 and the drain electrode 154 may contact the active layer 152 to be electrically connected to the active layer 152. The source electrode 153 and the drain electrode 154 may be any one of various metal materials such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy of two or more thereof, or a multilayer thereof, but are not limited thereto.

[0138] In addition, the gate insulating layer 113 and the interlayer insulating layer 114 are patterned in such a manner that they are formed only in the region overlapping the plurality of first substrates ST1. Similar to the buffer layer 112, the gate insulating layer 113 and the interlayer insulating layer 114 are also formed of an inorganic material so that the gate insulating layer 113 and the interlayer insulating layer 114 are also easily broken and damaged in the process of extending the stretchable display device 100. Therefore, the gate insulating layer 113 and the interlayer insulating layer 114 are not formed in the region between the plurality of first substrates ST1, but are patterned to have the shape of the plurality of first substrates ST1 formed only above the plurality of first substrates ST1.

[0139] exist Figure 3 In the present invention, even among various transistors that can be included in the stretchable display device 100, only a driving transistor is shown for the purpose of convenience of description, but a switching transistor or a capacitor may also be included in the display device. In addition, in the specification, although the transistor 150 is described as having a coplanar structure, various transistors such as a staggered transistor may also be used.

[0140] Reference Figure 3, a plurality of pads 130 are disposed on the interlayer insulating layer 114. In the drawings, although it is shown that the plurality of pads 130 are disposed on the first substrate ST1, the plurality of pads 130 may also be disposed on the second substrate ST2. The plurality of pads 130 may be pads that transmit any of various signals such as a strobe signal, a data signal, an emission signal, a high potential power signal, a low potential power signal, a reference voltage signal, and a compensation signal to the plurality of sub-pixels SPX, but are not limited thereto. In addition, the plurality of pads 130 may be formed of the same or substantially the same material as the source electrode 153 and the drain electrode 154, but are not limited thereto.

[0141] The plurality of pads 130 include a first pad 131 and a second pad 132. The first pad 131 may be connected to the first connection line 121. Also, the second pad 132 may be connected to the second connection line 122.

[0142] Reference Figure 3 , a planarization layer 115 is formed on the transistor 150 and the interlayer insulating layer 114. The planarization layer 115 planarizes the upper portion of the transistor 150. The planarization layer 115 may be configured by a single layer or a multilayer, and may be formed of an organic material. Therefore, the planarization layer 115 may also be referred to as an organic insulating layer. For example, the planarization layer 115 may be formed of an acrylic organic material, but is not limited thereto.

[0143] Reference Figure 3 , the planarization layer 115 is disposed on the plurality of first substrates ST1 in a manner of covering the top and side surfaces of the buffer layer 112, the gate insulating layer 113, and the interlayer insulating layer 114, so as to surround the buffer layer 112, the gate insulating layer 113, and the interlayer insulating layer 114 together with the plurality of first substrates ST1. Specifically, the planarization layer 115 may be disposed to cover the top and side surfaces of the interlayer insulating layer 114, the side surface of the gate insulating layer 113, the side surface of the buffer layer 112, and a portion of the top surface of the plurality of first substrates ST1.

[0144] The planarization layer 115 may supplement the steps on the side surfaces of the buffer layer 112, the gate insulation layer 113, and the interlayer insulation layer 114, and enhance the adhesive strength of the planarization layer 115 and the connection line 120 disposed on the side surface of the planarization layer 115. For example, the side surface of the planarization layer 115 may have a slope that is gentler than the slope formed by the side surface of the interlayer insulation layer 114, the side surface of the gate insulation layer 113, and the side surface of the buffer layer 112. Therefore, the connection line 120 disposed in contact with the side surface of the planarization layer 115 is arranged at a gentle slope so that when the stretchable display device 100 is stretched, the stress generated in the connection line 120 is reduced. In addition, the occurrence of cracks in the connection line 120 or separation from the side of the planarization layer 115 can be suppressed.

[0145] In some exemplary embodiments, a passivation layer may be formed between the transistor 150 and the planarization layer 115. That is, the passivation layer may be formed to cover the transistor 150 to protect the transistor 150 from the penetration of moisture and oxygen. The passivation layer may be formed of an inorganic material and configured of a single layer or multiple layers, but is not limited thereto.

[0146] Reference Figure 3 , a common line CL is disposed on the gate insulating layer 113. The common line CL is a conductive line for applying a common voltage to the plurality of sub-pixels SPX. The common line CL may be formed of the same or substantially the same material as the gate electrode 151 of the transistor 150, but is not limited thereto.

[0147] Reference Figure 3 , a first connection pad 191 and a second connection pad 192 are disposed on the planarization layer 115. The first connection pad 191 is an electrode that electrically connects the LED 160 and the transistor 150 described below. For example, the first connection pad 191 may electrically connect the drain 154 of the transistor 150 and the LED 160 through a contact hole formed in the planarization layer 115.

[0148] The second connection pad 192 is an electrode electrically connecting the LED 160 and the common line CL. For example, the second connection pad 192 may electrically connect the common electrode CL and the LED 160 through a contact hole formed in the planarization layer 115.

[0149] Reference Figure 3 , the LED 160 is disposed on the first connection pad 191 and the second connection pad 192. The LED 160 includes an n-type layer 161, an active layer 162, a p-type layer 163, an n-electrode 164, and a p-electrode 165. The LED 160 of the stretchable display device 100 according to the exemplary embodiment of the present disclosure has a flip chip structure in which the n-electrode 164 and the p-electrode 165 are formed on one surface.

[0150] The n-type layer 161 may be formed by implanting n-type impurities into gallium nitride (GaN). The n-type layer 161 may be disposed on a separate base substrate formed of a material capable of emitting light.

[0151] The active layer 162 is disposed on the n-type layer 161. The active layer 162 is a light emitting layer that emits light in the LED 160 and may be formed of a nitride semiconductor such as indium gallium nitride (InGaN). The p-type layer 163 is disposed on the active layer 162. The p-type layer 163 may be formed by injecting p-type impurities into gallium nitride (GaN).

[0152] As described above, the LED 160 according to the exemplary embodiment of the present disclosure may be manufactured by sequentially stacking the n-type layer 161, the active layer 162, and the p-type layer 163, and then etching a predetermined portion to form the n-electrode 164 and the p-electrode 165. In this case, the predetermined portion may be etched to expose a portion of the n-type layer 161, the predetermined portion being a space for separating the n-electrode 164 and the p-electrode 165 from each other. In other words, the surface of the LED 160 provided with the n-electrode 164 and the p-electrode 165 is not a flat surface, but has different height levels.

[0153] As described above, in the etched region (in other words, on the n-type layer 161 exposed by the etching process), an n-electrode 164 is provided. The n-electrode 164 may be formed of a conductive material. Meanwhile, in the unetched region (in other words, on the p-type layer 163), a p-electrode 165 is provided. The p-electrode 165 is also formed of a conductive material, for example, may be formed of the same or substantially the same material as the n-electrode 164. The above-mentioned p-electrode 165 and n-electrode 164 may be defined as the first electrode and the second electrode of the LED 160, respectively.

[0154] The adhesive layer AD is disposed on the top surfaces of the first and second connection pads 191 and 192 and between the first and second connection pads 191 and 192 so that the LED 160 can be bonded to the first and second connection pads 191 and 192. In this case, the n-electrode 164 can be disposed on the second connection pad 192, and the p-electrode 165 can be disposed on the first connection pad 191.

[0155] The adhesive layer AD may be a conductive adhesive layer in which conductive balls are dispersed in an insulating base member. Therefore, when heat or pressure is applied to the adhesive layer AD, the conductive balls are electrically connected in the portion to which heat or pressure is applied to have conductive properties, and the area not pressurized may have insulating properties. For example, the n-electrode 164 is electrically connected to the second connection line 122 by means of the adhesive layer AD, and the p-electrode 165 is electrically connected to the first connection line 121 by means of the adhesive layer AD. That is, after applying the adhesive layer AD on the first connection pad 191 and the second connection pad 192 using an inkjet method, the LED 160 is transferred to the adhesive layer AD, and the LED 160 is pressurized and heated. By doing so, the first connection pad 191 may be electrically connected to the p-electrode 165, and the second connection pad 192 may be electrically connected to the n-electrode 164. However, another portion of the adhesive layer AD except for a portion of the adhesive layer AD disposed between the n-electrode 164 and the second connection pad 192 and a portion of the adhesive layer AD disposed between the p-electrode 165 and the first connection pad 191 has an insulating property.

[0156] Meanwhile, the adhesive layer AD may be divided into layers respectively disposed on the first connection pad 191 and the second connection pad 192. That is, the adhesive layer AD disposed between the p-electrode 165 and the first connection pad 191 may be defined as a first adhesive pattern, and the adhesive layer AD disposed between the n-electrode 164 and the second connection pad 192 may be defined as a second adhesive pattern.

[0157] As described above, the stretchable display device 100 according to the exemplary embodiment of the present disclosure has a structure in which the LED 160 is provided on the base substrate DS provided with the transistor 150. Therefore, when the stretchable display device 100 is turned on, different voltage levels applied to the first connection pad 191 and the second connection pad 192 are transmitted to the n-electrode 164 and the p-electrode 165, so that the LED 160 emits light.

[0158] At the same time, despite Figure 3 In the embodiment of the present invention, it is shown that the embankment is not used, but the embankment may also be formed on the first connection pad 191, the second connection pad 192, the connection line 180 and the planarization layer 115. The embankment may divide the sub-pixels SPX disposed on one side and the other side of the LED 160 into adjacent to each other. The embankment may be formed of an insulating material. In addition, the embankment may include a black material. The embankment includes a black material to block the wire that may be visible through the display area AA. For example, the embankment may be formed of a transparent carbon-based mixture, and specifically, includes carbon black. However, it is not limited thereto, and the embankment may be formed of a transparent insulating material.

[0159] Reference Figure 1 and Figure 3 , the upper substrate US is disposed on the LED 160 and the base substrate DS. The upper substrate US is a substrate that supports various components disposed below the upper substrate US. Specifically, the upper substrate US is formed by coating a material configuring the upper substrate US on the base substrate DS and then curing the material disposed in contact with the base substrate DS, the first substrate ST1, the second substrate ST2, and the connection substrate CS.

[0160] The upper substrate US as a flexible substrate may be configured of a bendable or stretchable insulating material. The upper substrate US is a flexible substrate, thereby reversibly expanding and contracting. In addition, the elastic modulus of the upper substrate may be several MPa to several hundred MPa, and the ductile fracture rate may be 100% or more. The thickness of the upper substrate US may be 10 μm to 1 mm, but is not limited thereto.

[0161] The upper substrate US may be formed of the same or substantially the same material as the base substrate DS. For example, the upper substrate US may be formed of silicone rubber such as polydimethylsiloxane (PDMS) or an elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE), and thus has flexibility. However, the material of the upper substrate US is not limited thereto.

[0162] At the same time, although not Figure 3 , but the polarizing layer may also be provided on the upper substrate US. The polarizing layer may perform the function of polarizing light incident from the outside of the stretchable display device 100 to reduce external light reflection. In addition, an optical film other than the polarizing layer may be provided on the upper substrate US.

[0163] Reference Figure 2 and Figure 3 , a plurality of connection lines 120 are provided on the planarization layer 115 and the plurality of connection substrates CS. The plurality of connection lines 120 refer to conductive lines that electrically connect a plurality of pads 130 adjacent to each other. In this case, the connection lines 120 and the pads 130 may be connected to each other through contact holes formed in the planarization layer 115. The plurality of connection lines 120 may be configured by one of various conductive lines such as a gate line, a data line, an emission signal line, a high potential power line, a low potential power line, a reference voltage line, and a compensation signal line, but is not limited thereto.

[0164] A plurality of connection lines 120 are disposed between two adjacent first substrates ST1 to electrically connect the two first substrates ST1. Specifically, the plurality of connection lines 120 are disposed on a connection substrate CS that connects the two adjacent first substrates ST1 and the two adjacent second substrates ST2. In addition, the plurality of connection lines 120 may be disposed between the two adjacent second substrates ST2 and between the first substrate ST1 and the second substrate ST2 that are adjacent to each other.

[0165] In the region corresponding to the connection substrate CS, the connection lines 120 are formed to have the same shape as the connection substrates CS to overlap each other. That is, the connection lines 120 may be above the connection substrates CS and have the same wavy shape as the connection substrates CS.

[0166] The plurality of connection lines 120 include first connection lines 121 and second connection lines 122. The first connection lines 121 and the second connection lines 122 may be disposed between the plurality of first substrates ST1, between the plurality of second substrates ST2, or between the plurality of first substrates ST1 and the plurality of second substrates ST2.

[0167] The first connection line 121 may be formed to extend to the top surface of the connection substrate CS while contacting the top and side surfaces of the planarization layer 115 disposed on the first substrate ST1. In addition, the second connection line 122 may be formed to extend to the top surface of the connection substrate CS while contacting the top and side surfaces of the planarization layer 115 disposed on the first substrate ST1.

[0168] exist Figure 1 and Figure 2 , the first connection line 121 may refer to a wire extending along the X-axis direction among the plurality of connection lines 120, and the second connection line 122 may refer to a wire extending along the Y-axis direction among the plurality of connection lines 120. The first connection line 121 and the second connection line 122 may be configured to send different signals to the plurality of sub-pixels SPX. That is, the signal sent by the first connection line 121 may be different from the signal sent by the second connection line 122.

[0169] The plurality of connection lines 120 may be formed of metal materials such as copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo) or a stacked structure of metal materials such as copper / molybdenum titanium (Cu / MoTi) or titanium / aluminum / titanium (Ti / Al / Ti), but is not limited thereto.

[0170] The display device includes various signal lines such as a gate line, a data line, an emission signal line, a high potential power line, a low potential power line, a reference voltage line, or a compensation signal line. In the case of a general display device, the various signal lines extend in a straight line between a plurality of sub-pixels, and a plurality of sub-pixels are connected to one signal line. Therefore, in a general display device, the various signal lines may extend from one side of the display device to the other side without being disconnected on the substrate.

[0171] In contrast, in the case of the stretchable display device 100 according to the exemplary embodiment of the present disclosure, straight signal lines considered for a general display device are provided only on the plurality of first substrates ST1 and the plurality of second substrates ST2. That is, in the stretchable display device 100 according to the exemplary embodiment of the present disclosure, straight signal lines may be provided only on the plurality of first substrates ST1 and the plurality of second substrates ST2.

[0172] In the stretchable display device 100 according to the exemplary embodiment of the present disclosure, in order to connect discontinuous conductive lines on the first substrate ST1 or the second substrate ST2, the pads 130 on the adjacent substrates ST1 and ST2 may be connected by the connection wires 120. That is, the connection wires 120 electrically connect the pads 130 on the adjacent two first substrates ST1, the adjacent two second substrates ST2, and the adjacent first substrates ST1 and second substrates ST2. Therefore, in the stretchable display device 100 according to the exemplary embodiment of the present disclosure, the straight signal lines on the plurality of first substrates ST1 and the plurality of second substrates ST2 may be electrically connected to each other by the plurality of connection wires 120.

[0173] For example, the gate line may be provided on a plurality of first substrates ST1 disposed adjacent to each other in the X-axis direction, and the gate pad may be provided on both ends of the gate line. For example, the first pad 131 may be one of the gate pads disposed on both ends of the gate line of the sub-pixel SPX. The first connection line 121 may be used as the gate line. In addition, the first pads 131 on the plurality of first substrates ST1 adjacent to each other in the X-axis direction may be connected to each other through the first connection line 121 on the connection substrate CS. Therefore, the gate lines disposed on the plurality of first substrates ST1 and the first connection line 121 disposed on the connection substrate CS may be used as one gate line. Therefore, one gate signal may be sent to the gates 151 of the plurality of sub-pixels SPX through the first pad 131, the first connection line 121, and the gate lines disposed on the plurality of first substrates ST1.

[0174] In addition, the data line is arranged on a plurality of first substrates ST1 arranged adjacent to each other in the Y-axis direction, and the data pads may be arranged at both ends of the data line. For example, the second pad 32 may be one of the data pads arranged on both ends of the data line of the sub-pixel SPX. The second connection line 122 may be used as the data line. In addition, the second pad 132 and another upper pad on the plurality of first substrates ST1 adjacent to each other in the Y-axis direction may be connected to each other through the second connection line 122 on the connection substrate CS. Therefore, the data line arranged on the plurality of first substrates ST1 and the second connection line 122 arranged on the connection substrate CS may be used as one data line. Therefore, one data signal may be sent to the plurality of sub-pixels SPX through the second pad 132, another upper pad, the second connection line 122, and the data line arranged on the plurality of first substrates ST1.

[0175] In addition, the connecting line 120 may also include a conductive wire that connects the pads on the multiple first substrates ST1 with the pads on the multiple second substrates ST2, or connects the pads on two second substrates ST2 that are arranged in parallel among the pads on the multiple second substrates ST2 adjacent in the Y-axis direction.

[0176] <First sink pattern>

[0177] Figure 4 is a plan view showing one pixel of a stretchable display device according to an exemplary embodiment of the present disclosure. Figure 5 is along Figure 4 For ease of description, Figure 4 and Figure 5 Not shown Figure 3 The connecting line 120, the plurality of pads 131 and 132, and the plurality of connecting pads 191 and 192 are shown.

[0178] Reference Figure 4 In the stretchable display device 100, a first depression pattern SNK1 may be formed in a region between a plurality of sub-pixels SPX. Figure 5 , the planarization layer 115 may include at least one first depressed pattern SNK1 formed at a side of the LED 160 that is a light emitting diode provided in the plurality of sub-pixels SPX.

[0179] exist Figure 4 , it is shown that only one first depression pattern SNK1 is provided between the plurality of sub-pixels SPX. However, the present disclosure is not limited thereto, and according to the necessity of the design of the stretchable display device, a plurality of first depression patterns SNK1 may be provided between the plurality of sub-pixels SPX, or the first depression pattern may not be provided between the plurality of sub-pixels SPX.

[0180] like Figure 4 and Figure 5 As shown in FIG. 1 , the LED 160 disposed in each sub-pixel SPX includes a p-electrode 165 as a first electrode and an n-electrode 164 as a second electrode. In addition, the first electrode 165 and the second electrode 164 are disposed along the Y direction. Figure 4 As shown, the LED 160 may extend in one direction (the Y direction). That is, the LED 160 may have a length in the Y direction.

[0181] In addition, as described above, the p-electrode 165 of the LED 160 may be attached through the first bonding pattern AD1, and the n-electrode 164 of the LED 160 may be attached through the second bonding pattern AD2. In addition, the first bonding pattern AD1 and the second bonding pattern AD2 may be conductive bonding patterns in which conductive balls are dispersed in the insulating base member. Typically, the diameter of the conductive ball electrically connecting the p-electrode 165 and the n-electrode 164 of the LED 160 may be 2 μm to 3 μm.

[0182] Based on the above description, the length of the first depressed pattern SNK1 in one direction (Y direction) may be greater than the length of the LED 160. In addition, the width W1 of the first depressed pattern SNK1 in another direction (X direction) perpendicular to the one direction may be greater than the diameter of the conductive ball of the first bonding pattern AD1 and the second bonding pattern AD2. That is, the width W1 of the first depressed pattern SNK1 may be 3 μm or more, but this is only an example, and the width W1 of the first depressed pattern SNK1 may vary according to the diameter of the conductive ball.

[0183] As described above, the p-electrode 165 of the LED 160 and the second connection pad 192 and the n-electrode 164 can be electrically connected by heating the LED after transferring the LED 160 onto the adhesive patterns AD1 and AD2 and pressurizing the LED 160. Unlike the stretchable display device according to the exemplary embodiment of the present disclosure, when the plurality of first depression patterns SNK1 are not formed on the planarization layer 115, during the process of pressurizing the LED 160, the adhesive patterns AD1 and AD2 overflow onto the adjacent sub-pixel SPX. Therefore, there may be a problem that the adhesive patterns are electrically connected to the adjacent sub-pixel SPX. In addition, during the process of pressurizing the LED 160, the adhesive patterns AD1 and AD2 overflow to the area outside the first substrate ST1, so that the adhesive patterns AD1 and AD2 may invade the base substrate DS where the first substrate ST1 is not provided. Thereafter, after the heating process, the adhesive patterns AD1 and AD2 that invade the base substrate DS where the first substrate ST1 is not provided are hardened so that the base substrate has a prescribed rigidity. Therefore, the base substrate DS without the first substrate ST1 needs to be bendable or stretchable, but the base substrate DS does not stretch due to the intruding adhesive patterns AD1 and AD2. That is, the adhesive patterns AD1 and AD2 invade the base substrate DS without the first substrate ST1, so there is a problem that the elongation of the stretchable display device is significantly reduced.

[0184] Therefore, in the display device according to the exemplary embodiment of the present disclosure, a plurality of first depressed patterns SNK1 are formed at the sides of the sub-pixels SPX on the planarization layer 115 so that the adhesive patterns AD1 and AD2 are suppressed from overflowing to the area outside the first substrate ST1 during the process of pressurizing the LED 160. That is, the adhesive patterns AD1 and AD2 are captured in the first depressed patterns SNK1.

[0185] In addition, the length of the first recessed pattern SNK1 in one direction (Y direction) is formed to be greater than the length of the LED 160 so that the adhesive patterns AD1 and AD2 disposed under the LED 160 may not intrude into the upper and lower portions of the first depressed pattern SNK1.

[0186] In addition, the width of the first depression pattern SNK1 is formed to be greater than the diameter of each of the conductive balls of the first and second adhesion patterns AD1 and AD2 so that the adhesion patterns AD1 and AD2 can be captured in the first depression pattern SNK1 .

[0187] If the width of the first depression pattern SNK1 is smaller than the diameter of each of the conductive balls of the first bonding pattern AD1 and the second bonding pattern AD2, the conductive balls block the upper portion of the first depression pattern SNK1 so that the bonding patterns AD1 and AD2 are not captured by the first depression pattern SNK1. Therefore, the width of the first depression pattern SNK1 needs to be formed to be larger than the diameter of each of the conductive balls of the first bonding pattern AD1 and the second bonding pattern AD2. By doing so, during the process of pressurizing the LED 160, the bonding patterns AD1 and AD2 may not overflow to the area outside the first substrate ST1.

[0188] <Another Exemplary Embodiment of the Present Disclosure—Second to Fourth Sag Patterns>

[0189] Figure 6 is a plan view showing one pixel of a stretchable display device according to another exemplary embodiment of the present disclosure. Figure 7 is along Figure 6 For ease of description, Figure 6 and Figure 7 Not shown Figure 3 The connecting wire 120, the plurality of pads 131 and 132, and the plurality of connecting pads 191 and 192 are shown. The components of another exemplary embodiment of the present disclosure are the same as those of an exemplary embodiment of the present disclosure except that the second to fourth recessed patterns SNK2 to SNK4 are added. Therefore, the second to fourth recessed patterns SNK2 to SNK4 will be described in detail.

[0190] Reference Figure 6 and Figure 7 According to another exemplary embodiment of the present disclosure, the stretchable display device may further include a second depression pattern SNK2 passing through a plurality of sub-pixels SPX, a third depression pattern SNK3 surrounding a peripheral area of ​​the pixel PX, and a fourth depression pattern SNK4 formed on the inclined surface of the planarization layer 115.

[0191] More specifically, the second depression pattern SNK2 is formed in a region between the first adhesion pattern AD1 and the second adhesion pattern AD2 or in a region between the p-electrode 165 as the first electrode and the n-electrode 164 as the second electrode on the planarization layer 115. In addition, the second depression pattern SNK2 extends in another direction (X direction) to be connected to the first depression pattern SNK1 extending in one direction.

[0192] Therefore, the second depression pattern SNK2 connected to the first depression pattern SNK1 is formed so that the bonding patterns AD1 and AD2 captured in the first depression pattern SNK1 can flow into the second depression pattern SNK2. Therefore, the accommodation capacity of the bonding patterns (AD1 and AD2) that capture the bonding patterns AD1 and AD2 flowing during the pressurization process is improved. Therefore, the bonding patterns AD1 and AD2 can be more captured in the first depression pattern SNK1 and the second depression pattern SNK2.

[0193] In addition, the third depressed pattern SNK3 is formed on the first substrate ST1 in the form of surrounding the peripheral region of the pixel PX. That is, the third depressed pattern SNK3 is disposed in the peripheral region of the first substrate ST1 where the planarization layer 115 is not disposed.

[0194] However, even in Figure 6 , it is shown that the third sunken pattern SNK3 is continuous as one band shape surrounding the first substrate ST1, but the present disclosure is not limited thereto, and the third sunken pattern SNK3 may be divided into a plurality of sunken patterns.

[0195] In addition, the fourth depressed pattern SNK4 may be formed on the inclined surface of the planarization layer 115. More specifically, the fourth depressed pattern SNK4 may be formed on the inclined surface of the planarization layer 115 as a pattern extending in a direction in which the inclined surface of the planarization layer 115 extends. In addition, a plurality of fourth depressed patterns SNK4 may be formed, and each of the fourth depressed patterns SNK4 may extend in parallel in a direction in which the inclined surface of the planarization layer 115 extends.

[0196] As described above, the third and fourth depression patterns SNK3 and SNK4 are formed so that the bonding patterns AD1 and AD2 do not overflow to the area outside the first substrate ST1 during the process of pressurizing the LED 160. That is, the third and fourth depression patterns SNK3 and SNK4 are both disposed in a path where the bonding patterns AD1 and AD2 invade the outside of the first substrate ST1. Therefore, during the process of pressurizing the LED 160, when the bonding patterns AD1 and AD2 overflow to the outside of the first substrate ST1, the bonding patterns AD1 and AD2 are captured by the third and fourth depression patterns SNK3 and SNK4. Therefore, the bonding patterns AD1 and AD2 do not invade the base substrate DS disposed outside the first substrate ST1. By doing so, even if the stretchable display device of the present disclosure is subjected to a heat treatment, deterioration of elongation does not occur.

[0197] In addition, the width W2 of the second depression pattern SNK2, the width W3 of the third depression pattern SNK3, and the width W4 of the fourth depression pattern SNK4 may be greater than the diameter of the conductive ball of the first bonding pattern AD1 and the second bonding pattern AD2. That is, the width W2 of the second depression pattern SNK2, the width W3 of the third depression pattern SNK3, and the width W4 of the fourth depression pattern SNK4 may be 3 μm or more, but these are only examples. Therefore, the width W2 of the second depression pattern SNK2, the width W3 of the third depression pattern SNK3, and the width W4 of the fourth depression pattern SNK4 may vary according to the diameter of each of the conductive balls.

[0198] If the width W2 of the second sag pattern SNK2, the width W3 of the third sag pattern SNK3, and the width W4 of the fourth sag pattern SNK4 are smaller than the diameter of each of the conductive balls of the first bonding pattern AD1 and the second bonding pattern AD2, the conductive balls block the upper portion of the second sag pattern SNK2, the upper portion of the third sag pattern SNK3, and the upper portion of the fourth sag pattern SNK4. Therefore, the second sag pattern SNK2, the third sag pattern SNK3, and the fourth sag pattern SNK4 may not be able to capture the bonding patterns AD1 and AD2. Therefore, the width W2 of the second sag pattern SNK2, the width W3 of the third sag pattern SNK3, and the width W4 of the fourth sag pattern SNK4 need to be greater than the diameter of each of the conductive balls of the first bonding pattern AD1 and the second bonding pattern AD2. By doing so, during the process of pressurizing the LED 160, the bonding patterns AD1 and AD2 do not overflow to the area outside the first substrate ST1.

[0199] <Another Exemplary Embodiment of the Present Disclosure—At Least One Dam>

[0200] Figure 8 is a plan view showing one pixel of a stretchable display device according to still another exemplary embodiment of the present disclosure. Fig. 9 is along Figure 8 A cross-sectional view taken along line IX-IX'. Fig.10 is a plan view showing one pixel of a stretchable display device according to still another exemplary embodiment of the present disclosure. Fig.11A and Fig. 11B is along Fig.10 For ease of description, Figures 8 to 11B Not shown Figure 3 The connecting line 120, the plurality of pads 131 and 132, and the plurality of connecting pads 191 and 192 are shown. The components of another exemplary embodiment of the present disclosure are the same as those of another exemplary embodiment of the present disclosure except that at least one dam DM is added. Therefore, the at least one dam DM will be described in detail.

[0201] Reference Figure 8 and Fig. 9 , the stretchable display device according to still another exemplary embodiment of the present disclosure may further include a dam DM surrounding a peripheral area of ​​the pixel PX.

[0202] Specifically, the dam DM is formed on the planarization layer 115 in the form of surrounding the peripheral area of ​​the pixel. In addition, since the planarization layer 115 is formed in the inner area of ​​the first substrate ST1, the dam DM formed on the planarization layer 115 can be disposed inside the third depression pattern SNK3 (arranged in the peripheral area of ​​the first substrate ST1). Figure 8 As shown, as seen from the top view, the dam DM may be formed to surround the plurality of sub-pixels SPX, and the third recessed pattern SNK3 may be formed to surround the dam DM.

[0203] In addition, the height H1 of the dam DM may be lower than the height H0 of the LED 160 .

[0204] As described above, the LED 160 is transferred onto the adhesive layer AD, and the LED 160 is pressurized and heated to electrically connect the LED 160. Therefore, when the height H1 of the dam DM is higher than the height H0 of the transferred LED 160, the LED 160 may not be connected because the height H1 of the dam DM may not pressurize the LED 160 from the upper side. Therefore, the height H1 of the dam DM needs to be lower than the height H0 of the LED 160.

[0205] However, in Figure 8 , it is shown that the dam DM is formed as one strip to be continuous, but the present disclosure is not limited thereto, and the dam DM may be divided into a plurality of dams.

[0206] As described above, the stretchable display device according to still another exemplary embodiment of the present disclosure includes the dam DM that surrounds the plurality of sub-pixels SPX on the planarization layer 115. Therefore, during the process of pressurizing the LED 160, the adhesive patterns AD1 and AD2 do not overflow to the first substrate ST1 due to the dam DM. Therefore, the adhesive patterns AD1 and AD2 do not invade the base substrate DS disposed outside the first substrate ST1. By doing so, even if the stretchable display device is subjected to a heating process, deterioration of elongation does not occur.

[0207] In addition, if Fig.10 , Fig.11A and Fig. 11B As shown, the dam DM may be composed of a plurality of sub-dams SDM1, SDM2 and SDM3.

[0208] That is, the dam DM may include a first sub-dam SDM1, a second sub-dam SDM2, and a third sub-dam SDM3.

[0209] Specifically, Fig.10 As shown, the first sub-dam SDM1 is disposed inside the second sub-dam SDM2, and the second sub-dam SDM2 is disposed inside the third sub-dam SDM3. In other words, the second sub-dam SDM2 may be disposed to surround the first sub-dam SDM1, and the third sub-dam SDM3 may be disposed to surround the second sub-dam SDM2.

[0210] In addition, if Fig.11A As shown, the heights H1 of the first sub-dam SDM1 , the second sub-dam SDM2 , and the third sub-dam SDM3 may be equal. That is, the heights H1 of the first sub-dam SDM1 , the second sub-dam SDM2 , and the third sub-dam SDM3 may be equal to or less than the height H0 of the LED 160 .

[0211] As described above, the stretchable display device according to still another exemplary embodiment of the present disclosure includes a plurality of sub-dams SDM1, SDM2, and SDM3 surrounding a plurality of sub-pixels SPX on the planarization layer 115. Therefore, the plurality of sub-dams SDM1, SDM2, and SDM3 are disposed in a path through which the adhesive patterns AD1 and AD2 flow during a process of pressurizing the LED 160 to more effectively block the path through which the adhesive patterns AD1 and AD2 flow.

[0212] In some exemplary embodiments, Fig. 11B As shown, the outer sub-dams arranged among the plurality of sub-dams SDM1, SDM2 and SDM3 may have a higher height H1.

[0213] That is, the height H1-2 of the second sub-dam SDM2 is higher than the height H1-1 of the first sub-dam SDM1, and the height H1-3 of the third sub-dam SDM3 is higher than the height H1-2 of the second sub-dam SDM2. In addition, as described above, the height H1-3 of the third sub-dam SDM3 may still be lower than the height H0 of the LED 160. In other words, the height H1-1 of the first sub-dam SDM1 most adjacent to the LED 160 may be the lowest.

[0214] As described above, since the height H1-1 of the first sub-dam SDM1 most adjacent to the LED 160 is the lowest, the adhesive patterns AD1 and AD2 pass over the first sub-dam ADM1 and are captured between the first sub-dam SDM1 and the second sub-dam SDM2 during the process of pressurizing the LED 160. Thereafter, the adhesive patterns AD1 and AD2 pass over the second sub-dam ADM2 to be captured between the second sub-dam SDM2 and the third sub-dam SDM3.

[0215] If the height H1-1 of the first sub-dam SDM1 is high, the adhesive patterns AD1 and AD2 do not go over the first sub-dam SDM1, so that the adhesive patterns are not caught between the first sub-dam SDM1 and the second sub-dam SDM2, but are accumulated along the side of the LED 160. Therefore, the LED 160 and the side of the adhesive patterns AD1 and AD2 may be electrically connected to each other, so that a driving failure of the LED 160 may occur.

[0216] Therefore, in some exemplary embodiments, the height H1 - 1 of the inner sub-dam SDM1 among the plurality of sub-dams DM is set low so that the adhesive patterns AD1 and AD2 may be effectively captured between the sub-dams DM during the process of pressurizing the LED 160 .

[0217] <Another Exemplary Embodiment of the Present Disclosure—Fifth Sag Pattern>

[0218] Fig.12 is a plan view showing one pixel of a stretchable display device according to still another exemplary embodiment of the present disclosure. Fig.13 is along Fig.12 ' is a cross-sectional view taken along line XIII-XIII' of FIG. Components of another exemplary embodiment of the present disclosure are the same as those of another exemplary embodiment of the present disclosure except that an auxiliary buffer layer having a fifth depression pattern formed therein is added. Therefore, the auxiliary buffer layer having the fifth depression pattern formed therein will be described in detail.

[0219] Reference Fig.12 and Fig.13 The stretchable display device according to still another exemplary embodiment of the present disclosure may further include an auxiliary buffer layer 116 on which a fifth sunken pattern SNK5 is formed.

[0220] Specifically, the auxiliary buffer layer 116 is disposed between the buffer layer 112 and the first substrate ST1. Specifically, the auxiliary buffer layer 116 may also be disposed between the planarization layer 115 covering the side of the buffer layer 112 and the first substrate ST1. That is, the lower surface of the auxiliary buffer layer 116 contacts the first substrate ST1, and the upper surface of the auxiliary buffer layer 116 may contact the buffer layer 112 and the planarization layer 115.

[0221] Similar to the buffer layer 112, the auxiliary buffer layer 116 is formed on the plurality of first substrates ST1 to protect various components of the stretchable display device 100 from moisture H2O and oxygen O2 that penetrate from the outside of the base substrate DS and the plurality of first substrates ST1. The auxiliary buffer layer 116 may be composed of an insulating material, and, for example, a single layer or double layer of an inorganic layer formed of silicon nitride (SiNx), silicon oxide (SiOx), and silicon oxynitride (SiON).

[0222] In addition, the fifth recessed pattern SNK5 may be formed in a peripheral region of the auxiliary buffer layer 116. That is, the fifth recessed pattern SNK5 is disposed in a peripheral region of the auxiliary buffer layer 116 where the buffer layer 112 and the planarization layer 115 are not disposed.

[0223] However, even in Figure 6 , it is shown that the fifth sunken pattern SNK5 is continuous as one band shape surrounding the first substrate ST1, the present disclosure is not limited thereto, and the fifth sunken pattern SNK5 may be divided into a plurality of sunken patterns.

[0224] As described above, the fifth depressed pattern SNK5 is formed so that the bonding patterns AD1 and AD2 do not overflow to the area outside the first substrate ST1 during the process of pressurizing the LED 160. That is, the fifth depressed pattern SNK5 is disposed in a path where the bonding patterns AD1 and AD2 invade the outside of the first substrate ST1. Therefore, during the process of pressurizing the LED 160, when the bonding patterns AD1 and AD2 overflow to the outside of the first substrate ST1, the bonding patterns AD1 and AD2 are captured by the fifth depressed pattern SNK5. Therefore, the bonding patterns AD1 and AD2 do not invade the base substrate DS disposed outside the first substrate ST1. By doing so, even if the stretchable display device is subjected to a heating process, deterioration of elongation does not occur.

[0225] In addition, the width W5 of the fifth depression pattern SNK5 may be greater than the diameter of each of the conductive balls of the first and second adhesion patterns AD1 and AD2. That is, the width W5 of the fifth depression pattern SNK5 may be 3 μm or more, but this is only an example and the width W5 of the fifth depression pattern SNK5 may vary according to the diameter of the conductive ball.

[0226] If the width W5 of the fifth sag pattern SNK5 is smaller than the diameter of each of the conductive balls of the first bonding pattern AD1 and the second bonding pattern AD2, the conductive balls block the upper portion of the fifth sag pattern SNK5 so that the bonding patterns AD1 and AD2 are not captured by the fifth sag pattern SNK5. Therefore, the width W5 of the fifth sag pattern SNK5 needs to be formed to be larger than the diameter of each of the conductive balls of the first bonding pattern AD1 and the second bonding pattern AD2. By doing so, during the process of pressurizing the LED 160, the bonding patterns AD1 and AD2 may not overflow to the area outside the first substrate ST1.

[0227] Exemplary embodiments of the present disclosure may also be described as follows:

[0228] According to one aspect of the present disclosure, a stretchable display device includes: a base substrate including a display area and a non-display area; a plurality of first substrates, which are arranged on the display area and have a modulus larger than that of the base substrate; at least one transistor, which is formed on each of the plurality of first substrates; a planarization layer, which covers the at least one transistor; at least one light-emitting diode, which is electrically connected to the at least one transistor and formed on the planarization layer; and a plurality of bonding patterns, which are attached to each of the at least one light-emitting diode, wherein the planarization layer includes at least one first depression pattern formed on the side of the at least one light-emitting diode, thereby suppressing the degradation of elongation.

[0229] The conductive balls may be dispersed in the plurality of bonding patterns, and a width of each of the at least one first depressed pattern may be greater than a diameter of each of the conductive balls.

[0230] The at least one light emitting diode may include a first electrode and a second electrode, and the plurality of adhesive patterns include a first adhesive pattern attached to the first electrode and a second adhesive pattern attached to the second electrode.

[0231] The planarization layer may further include at least one second depression pattern formed between the first adhesive pattern and the second adhesive pattern.

[0232] At least one first depressed pattern may be connected to at least one second depressed pattern.

[0233] The conductive balls may be dispersed in the plurality of bonding patterns, and a width of each of the at least one second depressed pattern may be greater than a diameter of each of the conductive balls.

[0234] Each of the plurality of first substrates includes at least one third depressed pattern formed in a region where the planarization layer is not disposed.

[0235] At least one third depressed pattern may surround the plurality of first substrates.

[0236] A side surface of the planarization layer has a slope, and at least one fourth depressed pattern may be formed on the side surface of the planarization layer.

[0237] A side surface of the planarization layer may extend in one direction, and the at least one fourth depressed pattern extends in the one direction.

[0238] The stretchable display device may further include at least one dam on the planarization layer, the at least one dam including surrounding the at least one light emitting diode.

[0239] A height of the at least one dam may be lower than a height of the at least one light emitting diode.

[0240] Each of the at least one dam may include a plurality of sub-dams having the same height.

[0241] Each of the at least one dam may include a plurality of sub-dams having different heights, and a sub-dam disposed outside among the plurality of sub-dams may have a largest height.

[0242] The stretchable display device may further include an auxiliary buffer layer formed between the plurality of first substrates and the planarization layer.

[0243] The auxiliary buffer layer includes at least one fifth depressed pattern formed in a region where the planarization layer is not disposed.

[0244] At least one fifth recessed pattern may surround the auxiliary buffer layer.

[0245] According to another aspect of the present disclosure, a stretchable display device includes: a soft substrate capable of being stretched; a plurality of rigid substrates, which are arranged on the soft substrate in a manner spaced apart from each other; a plurality of sub-pixels, which are defined on the plurality of rigid substrates and include light-emitting diodes attached by an adhesive layer; a plurality of first recessed patterns, which are formed on sides of the plurality of sub-pixels; at least one second recessed pattern, which connects the plurality of first recessed patterns; and a third recessed pattern, which surrounds the plurality of sub-pixels.

[0246] The stretchable display device also includes a planarization layer that is disposed on the plurality of rigid substrates and forms a light emitting diode on an upper surface.

[0247] A plurality of first depression patterns and at least one second depression pattern may be formed on the planarization layer.

[0248] A side surface of the planarization layer has a slope, and at least one fourth depressed pattern is formed on the side surface of the planarization layer.

[0249] The third depressed pattern may be formed in a region of the plurality of rigid substrates where the planarization layer is not disposed.

[0250] The stretchable display device may further include at least one dam surrounding the plurality of sub-pixels.

[0251] The height of at least one dam may be lower than the height of the light emitting diode.

[0252] Each of the at least one dam may include a plurality of sub-dams having different heights, and a sub-dam adjacent to the plurality of sub-pixels among the plurality of sub-dams may have a low height.

[0253] The stretchable display device may further include an auxiliary buffer layer formed between the plurality of rigid substrates and the planarization layer.

[0254] The fifth recessed pattern may be disposed at a peripheral region of the auxiliary buffer layer.

[0255] Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and may be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above exemplary embodiments are exemplary in all aspects and do not limit the present disclosure. The scope of protection of the present disclosure should be interpreted based on the attached claims, and all technical concepts within their equivalent scope should be interpreted as falling within the scope of the present disclosure.

[0256] CROSS-REFERENCE TO RELATED APPLICATIONS

[0257] This application claims the priority of Korean Patent Application No. 10-2019-0139302 filed on November 4, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

Claims

1. A stretchable display device, comprising: a base substrate, the base substrate comprising a display area and a non-display area adjacent to the display area; a plurality of first substrates disposed on the display area and having a modulus greater than that of the base substrate; at least one transistor formed on each of the plurality of first substrates; a planarization layer on the at least one transistor; at least one light emitting diode connected to the at least one transistor and formed on the planarization layer; a plurality of bonding patterns on the planarization layer and connected to each of the at least one light emitting diode, the plurality of bonding patterns comprising a first bonding pattern and a second bonding pattern; at least one first depressed pattern, the at least one first depressed pattern being included in the planarization layer, the at least one first depressed pattern being adjacent to the at least one light emitting diode; as well as at least one second depressed pattern, the at least one second depressed pattern being included in the planarization layer and formed between the first bonding pattern and the second bonding pattern, Wherein, the at least one first depressed pattern is connected to the at least one second depressed pattern.

2. The stretchable display device according to claim 1, in, The plurality of bonding patterns include conductive balls, and A width of each of the at least one first depression pattern is greater than a diameter of each of the conductive balls.

3. The stretchable display device according to claim 1, in, Each of the at least one light emitting diode includes a first electrode and a second electrode, and Wherein, the first adhesive pattern is attached to the first electrode, and the second adhesive pattern is attached to the second electrode.

4. The stretchable display device according to claim 3, in, The plurality of bonding patterns include conductive balls, and a width of each of the at least one second depressed pattern is greater than a diameter of each of the conductive balls.

5. The stretchable display device according to claim 1, further comprising: At least one dam is on the planarization layer, the at least one dam surrounding the at least one light emitting diode.

6. The stretchable display device according to claim 5, in, The at least one dam has a height lower than that of the at least one light emitting diode.

7. The stretchable display device according to claim 5, in, Each of the at least one dam includes a plurality of sub-dams having the same height.

8. The stretchable display device according to claim 5, in, Each of the at least one dam includes a plurality of sub-dams having different heights, and a sub-dam disposed outside among the plurality of sub-dams has a largest height.

9. The stretchable display device according to claim 1, further comprising: an auxiliary buffer layer, the auxiliary buffer layer being formed between the plurality of first substrates and the planarization layer, The auxiliary buffer layer includes at least one fifth depressed pattern formed in a region where the planarization layer is not disposed.

10. The stretchable display device according to claim 9, wherein: The at least one fifth depressed pattern surrounds the auxiliary buffer layer.

11. A stretchable display device, comprising: a base substrate, the base substrate comprising a display area and a non-display area adjacent to the display area; a plurality of first substrates disposed on the display area and having a modulus greater than that of the base substrate; at least one transistor formed on each of the plurality of first substrates; a planarization layer on the at least one transistor; at least one light emitting diode connected to the at least one transistor and formed on the planarization layer; a plurality of bonding patterns on the planarization layer and connected to each of the at least one light emitting diode; as well as at least one first depressed pattern, the at least one first depressed pattern being included in the planarization layer, the at least one first depressed pattern being adjacent to the at least one light emitting diode, Each of the plurality of first substrates includes at least one third depressed pattern, and the at least one third depressed pattern is formed in a region where the planarization layer is not disposed.

12. The stretchable display device according to claim 11, in, The at least one third depressed pattern surrounds the plurality of first substrates.

13. A stretchable display device, comprising: a base substrate, the base substrate comprising a display area and a non-display area adjacent to the display area; a plurality of first substrates disposed on the display area and having a modulus greater than that of the base substrate; at least one transistor formed on each of the plurality of first substrates; A planarization layer, the planarization layer is on the at least one transistor, and a side surface of the planarization layer has a slope; at least one light emitting diode connected to the at least one transistor and formed on the planarization layer; a plurality of bonding patterns on the planarization layer and connected to each of the at least one light emitting diode; at least one first depressed pattern, the at least one first depressed pattern being included in the planarization layer, the at least one first depressed pattern being adjacent to the at least one light emitting diode; as well as At least one fourth depressed pattern is formed on the side surface of the planarization layer.

14. The stretchable display device according to claim 13, in, A side surface of the planarization layer extends in one direction, and at least one fourth depressed pattern extends in the one direction.

15. A stretchable display device, comprising: A soft substrate capable of stretching; a plurality of rigid substrates, the plurality of rigid substrates being arranged on the soft substrate in a manner of being spaced apart from each other; a plurality of sub-pixels defined on the plurality of rigid substrates and comprising light emitting diodes attached by an adhesive layer of the stretchable display device; a plurality of first sunken patterns, the plurality of first sunken patterns being formed on sides of the plurality of sub-pixels; at least one second sunken pattern, the at least one second sunken pattern connecting the plurality of first sunken patterns; as well as A third depressed pattern surrounds the plurality of sub-pixels.

16. The stretchable display device according to claim 15, further comprising: a planarization layer disposed on the plurality of rigid substrates and forming the light emitting diodes on an upper surface thereof, Wherein, the plurality of first recessed patterns and the at least one second recessed pattern are formed on the planarization layer.

17. The stretchable display device according to claim 16, in, The side surface of the planarization layer has a slope, and At least one fourth depressed pattern is formed on the side surface of the planarization layer.

18. The stretchable display device according to claim 16, in, The third depressed pattern is formed in a region of the plurality of rigid substrates where the planarization layer is not disposed.

19. The stretchable display device according to claim 15, further comprising: At least one dam surrounds the plurality of sub-pixels.

20. The stretchable display device according to claim 19, in, The at least one dam has a height lower than that of the light emitting diode.

21. The stretchable display device according to claim 19, in, Each of the at least one dam includes a plurality of sub-dams having different heights, and A sub-dam adjacent to the sub-pixels among the plurality of sub-dams has a low height.

22. The stretchable display device according to claim 16, further comprising: an auxiliary buffer layer, the auxiliary buffer layer being formed between the plurality of rigid substrates and the planarization layer, Wherein, the fifth recessed pattern is disposed at a peripheral region of the auxiliary buffer layer.

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