KR102653774B1 - Stretchable display device - Google Patents

Abstract

A stretchable display device according to an embodiment of the present invention includes a plurality of island substrates on which a plurality of pixels are defined and spaced apart from each other; a lower substrate disposed below the plurality of island substrates and having a plurality of grooves; a plurality of connection wires electrically connecting pads disposed on neighboring island substrates among the plurality of island substrates; and a lower adhesive layer disposed between the lower substrate and the plurality of island substrates to fill the plurality of grooves.

Description

Stretchable display device {STRETCHABLE DISPLAY DEVICE}

The present invention relates to a stretchable display device, and more specifically, to a stretchable display device in which bending and stretching movements are improved more freely by using a substrate that is stretchable and has a structure that can improve adhesion. .

Display devices used in computer monitors, TVs, mobile phones, etc. include organic light emitting displays (OLED) that emit light on their own, and liquid crystal displays (LCD) that require a separate light source. there is.

The scope of application of display devices is becoming more diverse, including not only computer monitors and TVs but also personal portable devices, and research is being conducted on display devices that have a large display area but reduced volume and weight.

In addition, stretchable display devices, which are manufactured by forming the display portion and wiring on a flexible substrate such as plastic, a flexible material, so that they can stretch and contract in a specific direction and change into various shapes, are the next-generation display devices. is attracting attention.

The problem to be solved by the present invention is to provide a stretchable display device that can improve the adhesive strength between the lower substrate and the island substrate by increasing the surface area where the lower substrate is in contact with the adhesive layer.

Another problem to be solved by the present invention is to provide a stretchable display device that minimizes deformation of the rigid region due to stretching of the stretchable display device by disposing a rigid material in the rigid region of the lower substrate.

Another problem to be solved by the present invention is to provide a stretchable display device that minimizes damage to the connection wires disposed between the rigid substrates when the stretchable display device is stretched by arranging a substrate connecting the rigid substrates. will be.

Another problem to be solved by the present invention is to provide a stretchable display device that minimizes damage to the connection wiring when stretching the stretchable display device by configuring the connection wiring to have an aspect ratio greater than 1.

Another problem to be solved by the present invention is to provide a stretchable display device that minimizes interference in transistors by placing a metal material on a lower substrate and applying a constant voltage.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the problems described above, a stretchable display device according to an embodiment of the present invention includes a plurality of island substrates in which a plurality of pixels are defined and spaced apart from each other; a lower substrate disposed below the plurality of island substrates and having a plurality of grooves; a plurality of connection wires electrically connecting pads disposed on neighboring island substrates among the plurality of island substrates; and a lower adhesive layer disposed between the lower substrate and the plurality of island substrates to fill the plurality of grooves.

A stretchable display device according to another embodiment of the present invention includes a lower flexible substrate including a rigid region and a flexible region; A plurality of rigid substrates disposed on a lower flexible substrate in the rigid region and having a plurality of pixels defined thereon; a plurality of rigid parts disposed on the lower flexible substrate to overlap the plurality of rigid substrates; And it may include a lower adhesive layer that attaches the lower flexible substrate and the plurality of rigid parts to the plurality of rigid substrates.

Specific details of other embodiments are included in the detailed description and drawings.

The present invention is configured to fill the groove of the lower substrate with an adhesive layer to increase the surface area where the lower substrate is in contact with the adhesive layer, thereby reducing delamination of the lower substrate and the plurality of island substrates when the stretchable display device is stretched. .

The present invention has the effect of disposing a rigid part on the lower substrate, thereby reducing the stretching or deformation of the lower substrate compared to the plurality of island substrates when the stretchable display device is stretched.

The present invention has the effect of reducing stress concentrated on the connection wiring when the stretchable display device is stretched by disposing a connection substrate between a plurality of island substrates.

The present invention has the effect of configuring the aspect ratio of the connection wires to be greater than 1, allowing the connection wires to be stretched more easily when the stretchable display device is stretched.

The present invention has the effect of reducing interference caused by current in the transistor by grounding the rigid part.

The effects according to the present invention are not limited to the details exemplified above, and further various effects are included within the present invention.

1 is an exploded perspective view of a stretchable display device according to an embodiment of the present invention.
Figure 2 is an enlarged plan view of a stretchable display device according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of one sub-pixel of FIG. 1.
Figure 4 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention.
Figure 5 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention.
Figure 6 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention.
Figure 7 is an image of the lower flexible substrate of a stretchable display device according to another embodiment of the present invention.
8A to 8D are schematic cross-sectional views of stretchable display devices according to various embodiments of the present invention.
Figure 9 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention.
Figure 10 is an image of the lower flexible substrate of a stretchable display device according to another embodiment of the present invention.
FIG. 11A is a cross-sectional view taken along line XI-XI' of FIG. 10.
FIG. 11B is a cross-sectional view taken along line XII-XII' of FIG. 10.
Figure 12 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention.
Figure 13 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention.
Figure 14 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention.
15A and 15B are cross-sectional views of connection wiring according to various embodiments of the present invention.
Figure 16 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and are known to those skilled in the art in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shape, area, ratio, angle, number, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'comprises', 'has', 'consists of', etc. mentioned in the present invention are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

When an element or layer is referred to as “on” another element or layer, it includes instances where the other layer or other element is directly on top of or interposed between the other elements.

Additionally, first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The area and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the area and thickness of the components shown.

Each feature of the various embodiments of the present invention can be combined or combined with each other, partially or entirely, and various technological interconnections and operations are possible, and each embodiment can be implemented independently of each other or together in a related relationship. It may be possible.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings.

<Stretchable display device>

A stretchable display device may be referred to as a display device that can display an image even if it is bent or stretched. A stretchable display device can have high flexibility compared to a typical conventional display device. Accordingly, the shape of the stretchable display device can be freely changed according to the user's manipulation, such as by bending or stretching the stretchable display device. For example, when a user holds an end of the stretchable display device and pulls it, the stretchable display device may be stretched by the user's force. Alternatively, when a user places the stretchable display device on a non-flat wall, the stretchable display device may be placed to bend along the shape of the surface of the wall. Additionally, when the force applied by the user is removed, the stretchable display device can return to its original form.

1 is an exploded perspective view of a display device according to an embodiment of the present invention. Referring to FIG. 1 , the stretchable display device 100 includes a lower substrate 110, a plurality of island substrates 111, a connection wire 180, a COF 130 (Chip on Flim), and a printed circuit board 140. ), an upper substrate 120, and a polarizing layer 190. In Figure 1, for convenience of explanation, the lower adhesive layer for adhering the lower substrate 110 and the upper substrate 120 is omitted.

The lower substrate 110 is a substrate for supporting and protecting various components of the stretchable display device 100. The lower substrate 110 is a flexible substrate and may be made of an insulating material that can be bent or stretched. For example, the lower substrate 110 is made of an elastomer such as silicone rubber such as polydimethylsiloxane (PDMS), polyurethane (PU), or polytetrafluoroethylene (PTFE). Accordingly, it can have flexible properties. However, the material of the lower substrate 110 is not limited thereto.

The lower substrate 110 is a flexible substrate and can be reversibly expanded and contracted. Additionally, the elastic modulus may be several MPa to hundreds of MPa, and the elongation failure rate may be 100% or more. The thickness of the lower substrate may be 10um to 1mm, but is not limited thereto.

The lower substrate 110 may have a display area AA and a non-display area NA surrounding the display area AA.

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 disposed. The display area AA includes a plurality of pixels including a plurality of sub-pixels. A plurality of pixels are arranged in the display area AA and include a plurality of display elements. Each of the plurality of sub-pixels may be connected to various wiring lines. For example, each of the plurality of sub-pixels may be connected to various wiring such as a gate wiring, data wiring, high-potential power wiring, low-potential power wiring, and reference voltage wiring.

The non-display area (NA) is an area adjacent to the display area (AA). The non-display area (NA) is an area adjacent to the display area (AA) and surrounding the display area (AA). The non-display area (NA) is an area where images are not displayed, and wiring and circuit parts may be formed. For example, a plurality of pads may be disposed in the non-display area NA, and each pad may be connected to each of a plurality of sub-pixels in the display area AA.

A plurality of island substrates 111 are disposed on the lower substrate 110. The plurality of island substrates 111 are rigid substrates and are arranged on the lower substrate 110 to be spaced apart from each other. The plurality of island substrates 111 may be stiffer than the lower substrate 110. That is, the lower substrate 110 may have softer characteristics than the plurality of island substrates 111, and the plurality of island substrates 111 may have stiffer characteristics than the lower substrate 110.

The plurality of island substrates 111, which are a plurality of rigid substrates, may be made of a plastic material with flexibility, for example, polyimide (PI), polyacrylate, polyacetate ( polyacetate), etc.

The modulus of the plurality of island substrates 111 may be higher than the modulus of the lower substrate 110. Modulus is an elastic coefficient that represents the ratio of deformation due to stress to the stress applied to the substrate. When the modulus is relatively high, the hardness may be relatively high. Accordingly, the plurality of island substrates 111 may be a plurality of rigid substrates having greater rigidity than the lower substrate 110 . The modulus of the plurality of island substrates 111 may be 1000 times greater than the modulus of the lower substrate 110, but is not limited thereto.

Connection wires 180 are disposed between the plurality of island substrates 111. The connection wires 180 may be disposed between pads disposed on the plurality of island substrates 111 to electrically connect each pad. A more detailed description of the connection wire 180 will be described in detail with reference to FIG. 2 .

The COF 130 is a film in which various components are arranged on a flexible base film 131, and is a component for supplying signals to a plurality of sub-pixels in the display area AA. The COF 130 may be bonded to a plurality of pads disposed in the non-display area NA, and supplies power voltage, data voltage, gate voltage, etc. to each of the plurality of sub-pixels in the display area AA through the pads. . The COF 130 includes a base film 131 and a driving IC 132, and various other components may be disposed therein.

The base film 131 is a layer that supports the driving IC 132 of the COF 130. The base film 131 may be made of an insulating material, for example, an insulating material with flexibility.

The driving IC 132 is a component that processes data for displaying images and driving signals for processing them. In FIG. 1, the driver IC 132 is shown as being mounted using the COF 130 method, but this is not limited to this, and the driver IC 132 is mounted using a COG (Chip On Glass), TCP (Tape Carrier Package) method, etc. It could be.

The printed circuit board 140 may be equipped with a control unit such as an IC chip or circuit unit. Additionally, memory, processors, etc. may be mounted on the printed circuit board 140. The printed circuit board 140 is a component that transmits signals for driving the display element from the control unit to the display element.

The printed circuit board 140 may be connected to the COF 130 and electrically connected to each of the plurality of sub-pixels of the plurality of island boards 111 .

The upper substrate 120 is a substrate that overlaps the lower substrate 110 to protect various components of the stretchable display device 100. The upper substrate 120 is a flexible substrate and may be made of an insulating material that can be bent or stretched. For example, the upper substrate 120 may be made of a flexible material and may be made of the same material as the lower substrate 110, but is not limited thereto.

The polarization layer 190 is a component that suppresses external light reflection of the stretchable display device 100 and may be disposed on the upper substrate 120 by overlapping with the upper substrate 120 . However, the present invention is not limited to this, and the polarization layer 190 may be disposed below the upper substrate 120 or may be omitted depending on the configuration of the stretchable display device 100.

Hereinafter, FIGS. 2 and 3 will be referred to for a more detailed description of the stretchable display device 100 according to an embodiment of the present invention.

<Plane and cross-sectional structure>

Figure 2 is an enlarged plan view of a stretchable display device according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the sub-pixel of FIG. 1. For convenience of explanation, description will be made with reference to FIG. 1.

Referring to FIGS. 2 and 3 , a plurality of island substrates 111 are disposed on the lower substrate 110 . The plurality of island substrates 111 are spaced apart from each other and disposed on the lower substrate 110. For example, the plurality of island substrates 111 may be arranged in a matrix form on the lower substrate 110 as shown in FIGS. 1 and 2, but is not limited thereto.

Referring to FIG. 3, a buffer layer 112 is disposed on the plurality of island substrates 111. The buffer layer 112 protects various components of the stretchable display device 100 from penetration of moisture (H ₂ O) and oxygen (O ₂ ) from the outside of the lower substrate 110 and the plurality of island substrates 111. It is formed on a plurality of island substrates 111 for protection. The buffer layer 112 may be made of an insulating material, for example, an inorganic layer made of graphite, silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), etc. may be formed as a single or double layer. It can be configured. However, the buffer layer 112 may be omitted depending on the structure or characteristics of the stretchable display device 100.

At this time, the buffer layer 112 may be formed only in areas that overlap the plurality of island substrates 111. As described above, since the buffer layer 112 may be made of an inorganic material, it may easily be damaged, such as by generating cracks, during the process of stretching the stretchable display device 100. Accordingly, the buffer layer 112 may not be formed in the area between the plurality of island substrates 111, but may be patterned in the shape of the plurality of island substrates 111 and formed only on top of the plurality of island substrates 111. Accordingly, the stretchable display device 100 according to an embodiment of the present invention forms the buffer layer 112 only in the area that overlaps the plurality of island substrates 111, which are rigid substrates, so that the stretchable display device 100 Damage to the buffer layer 112 can be prevented even when it is deformed, such as bending or stretching.

Referring to FIG. 3, a transistor 150 including a gate electrode 151, an active layer 152, a source electrode 153, and a drain electrode 154 is formed on the buffer layer 112. For example, the active layer 152 is formed on the buffer layer 112, and the gate insulating layer 113 is formed on the active layer 152 to insulate the active layer 152 and the gate electrode 151. . An interlayer insulating layer 114 is formed to insulate the gate electrode 151, the source electrode 153, and the drain electrode 154, and the source electrode ( 153) and a drain electrode 154 are formed.

Additionally, the gate insulating layer 113 and the interlayer insulating layer 114 may be patterned and formed only in areas that overlap the plurality of island substrates 111 . Since the gate insulating layer 113 and the interlayer insulating layer 114 may be made of the same inorganic material as the buffer layer 112, they may easily be damaged, such as cracks, during the process of stretching the stretchable display device 100. . Accordingly, the gate insulating layer 113 and the interlayer insulating layer 114 are not formed in the area between the plurality of island substrates 111, but are patterned in the shape of the plurality of island substrates 111 to form the plurality of island substrates 111. It can only be formed at the top.

In FIG. 3 , for convenience of explanation, only a driving transistor is shown among various transistors that may be included in the stretchable display device 100, but switching transistors, capacitors, etc. may also be included in the display device. Additionally, in this specification, the transistor 150 is described as having a coplanar structure, but various transistors such as a staggered structure may also be used.

Referring to FIG. 3, a gate pad 171 is disposed on the gate insulating layer 113. The gate pad 171 is a pad for transmitting a gate signal to a plurality of sub-pixels (SPX). The gate pad 171 may be made of the same material as the gate electrode 151, but is not limited thereto.

Referring to FIG. 3, a planarization layer 115 is formed on the transistor 150 and the interlayer insulating layer 114. The planarization layer 115 planarizes the upper part of the transistor 150. The planarization layer 115 may be composed of a single layer or multiple layers, and may be made of an organic material. For example, the planarization layer 115 may be made of an acryl-based organic material, but is not limited thereto. The planarization layer 115 includes a contact hole for electrically connecting the transistor 150 and the anode 161, a contact hole for electrically connecting the data pad 173 and the source electrode 153, and a connection pad 172. It may include a contact hole for electrically connecting the gate pad 171 and the gate pad 171.

In some embodiments, a passivation layer may be formed between the transistor 150 and the planarization layer 115. That is, in order to protect the transistor 150 from penetration of moisture and oxygen, a passivation layer may be formed to cover the transistor 150. The passivation layer may be made of an inorganic material and may be made of a single layer or a double layer, but is not limited thereto.

Referring to FIG. 3, a data pad 173, a connection pad 172, and an organic light emitting device 160 are disposed on the planarization layer 115.

The data pad 173 can transmit data signals from the connection line 180, which functions as a data line, to a plurality of sub-pixels (SPX). The data pad 173 is connected to the source electrode 153 of the transistor 150 through a contact hole formed in the planarization layer 115. The data pad 173 may be made of the same material as the anode 161 of the organic light emitting device 160, but is not limited thereto. Additionally, the data pad 173 may be formed on the interlayer insulating layer 114 rather than on the planarization layer 115 and may be formed of the same material as the source electrode 153 and the drain electrode 154 of the transistor 150. .

The connection pad 172 can transmit a gate signal from the connection wire 180, which functions as a gate wire, to a plurality of sub-pixels (SPX). The connection pad 172 is connected to the gate pad 171 through a contact hole formed in the planarization layer 115 and the interlayer insulating layer 114, and transmits a gate signal to the gate pad 171. The connection pad 172 may be made of the same material as the data pad 173, but is not limited thereto.

The organic light emitting device 160 is arranged to correspond to each of the plurality of sub-pixels (SPX) and is a component that emits light having a specific wavelength band. That is, the organic light-emitting device 160 may be a blue organic light-emitting device that emits blue light, a red organic light-emitting device that emits red light, a green organic light-emitting device that emits green light, or a white organic light-emitting device that emits white light, but is limited thereto. It doesn't work. When the organic light emitting device 160 is a white organic light emitting device, the stretchable display device 100 may further include a color filter.

The organic light emitting device 160 includes an anode 161, an organic light emitting layer 162, and a cathode 163. Specifically, the anode 161 is disposed on the planarization layer 115. The anode 161 is an electrode configured to supply holes to the organic light emitting layer 162. The anode 161 may be made of a transparent conductive material with a high work function. Here, the transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). The anode 161 may be made of the same material as the data pad 173 and the gate pad 171 disposed on the planarization layer 115, but is not limited thereto. Additionally, when the stretchable display device 100 is implemented using a top emission method, the anode 161 may further include a reflector.

The anode 161 is arranged to be spaced apart for each sub-pixel (SPX) and is electrically connected to the transistor 150 through a contact hole in the planarization layer 115. For example, in FIG. 2, the anode 161 is shown as being electrically connected to the drain electrode 154 of the transistor 150, but may also be electrically connected to the source electrode 153.

A bank 116 is formed on the anode 161, data pad 173, connection pad 172, and planarization layer 115. The bank 116 is a component that separates adjacent sub-pixels (SPX). The bank 116 is arranged to cover at least a portion of both sides of the adjacent anode 161 and exposes a portion of the upper surface of the anode 161. The bank 116 serves to prevent the problem of unintended sub-pixels (SPX) emitting light or mixing colors due to light being emitted toward the side of the anode 161 due to current concentration at the corner of the anode 161. It can also be done. The bank 116 may be made of acryl-based resin, benzocyclobutene (BCB)-based resin, or polyimide, but is not limited thereto.

The bank 116 includes a contact hole connecting the connection wire 180, which functions as a data wire, and the data pad 173, and a contact hole connecting the connection wire 180, which functions as a gate wire, and the connection pad 172. do.

The organic light-emitting layer 162 is disposed on the anode 161. The organic light emitting layer 162 is configured to emit light. The organic light-emitting layer 162 may include a light-emitting material, and the light-emitting material may include, but is not limited to, a phosphorescent material or a fluorescent material.

The organic light-emitting layer 162 may be composed of one light-emitting layer. Alternatively, the organic light-emitting layer 162 may have a stack structure in which a plurality of light-emitting layers are stacked with a charge generation layer interposed between them. Additionally, the organic light-emitting layer 162 may further include at least one organic layer selected from the group consisting of a hole transport layer, an electron transport layer, a hole blocking layer, an electron blocking layer, a hole injection layer, and an electron injection layer.

2 and 3, the cathode 163 is disposed on the organic light emitting layer 162. The cathode 163 supplies electrons to the organic light emitting layer 162. The cathode 163 is made of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and tin. It may be made of an oxide (Tin Oxide, TO)-based transparent conductive oxide or a ytterbium (Yb) alloy. Alternatively, the cathode 163 may be made of a metal material.

The cathode 163 may be patterned and formed to overlap each of the plurality of island substrates 111 . That is, the cathode 163 may be formed only in areas that overlap the plurality of island substrates 111 and may not be formed in areas between the plurality of island substrates 111 . Since the cathode 163 is made of a material such as a transparent conductive oxide, a metal material, etc., when the cathode 163 is also formed in the area between the plurality of island substrates 111, the process of stretching the stretchable display device 100 The cathode 163 may be damaged. Accordingly, the cathode 163 may be formed to correspond to each of the plurality of island substrates 111 on a plane surface. Referring to FIGS. 2 and 3 , the cathode 163 may be formed to have an area that does not overlap with the area where the connection wire 180 is disposed in the area that overlaps the plurality of island substrates 111 .

Different from a typical organic light emitting display device, in the stretchable display device 100 according to an embodiment of the present invention, the cathode 163 is patterned to correspond to the plurality of island substrates 111. Accordingly, each of the cathodes 163 disposed on the plurality of island substrates 111 can independently receive low-potential power through the connection wiring 180.

Referring to FIGS. 2 and 3 , an encapsulation layer 117 is disposed on the organic light emitting device 160. The encapsulation layer 117 covers the organic light emitting device 160 and may contact a portion of the upper surface of the bank 116 to seal the organic light emitting device 160. Accordingly, the encapsulation layer 117 protects the organic light emitting device 160 from moisture, air, or physical shock that may penetrate from the outside.

The encapsulation layer 117 covers each of the cathodes 163 patterned to overlap each of the plurality of island substrates 111, and may be formed for each of the plurality of island substrates 111. That is, the encapsulation layer 117 is disposed to cover one cathode 163 disposed on one island substrate 111, and the encapsulation layers 117 disposed on each of the plurality of island substrates 111 are spaced apart from each other. You can.

The encapsulation layer 117 may be formed only in areas that overlap the plurality of island substrates 111 . As described above, the encapsulation layer 117 may be configured to include an inorganic layer, and therefore may easily be damaged, such as cracks, during the process of stretching the stretchable display device 100. In particular, the organic light emitting device 160 is vulnerable to moisture or oxygen, so if the encapsulation layer 117 is damaged, the reliability of the organic light emitting device 160 may decrease. Accordingly, in the stretchable display device 100 according to an embodiment of the present invention, the encapsulation layer 117 is not formed in the area between the plurality of island substrates 111, so that the stretchable display device 100 Even in the case of deformation such as bending or stretching, damage to the encapsulation layer 117 can be minimized.

When comparing the stretchable display device 100 according to an embodiment of the present invention with a typical conventional flexible organic light emitting display device, the stretchable display device 100 includes a plurality of island substrates 111 that are relatively rigid. It has a structure in which they are spaced apart from each other and disposed on a relatively soft lower substrate 110. Additionally, the cathode 163 and the encapsulation layer 117 of the stretchable display device 100 are patterned and disposed to correspond to each of the plurality of island substrates 111. That is, in the stretchable display device 100 according to an embodiment of the present invention, the stretchable display device 100 can be more easily deformed when the user stretches or bends the stretchable display device 100. It may have a structure that minimizes damage to components of the stretchable display device 100 during the process of deforming the stretchable display device 100.

<Connection wiring composed of base polymer and conductive particles>

The connection wire 180 refers to a wire that electrically connects the pads on the plurality of island substrates 111. The connection wire 180 includes a first connection wire 181 and a second connection wire 182. The first connection wire 181 refers to a wire extending in the X-axis direction among the connection wires 180, and the second connection wire 182 refers to a wire extending in the Y-axis direction among the connection wires 180.

In a typical organic light emitting display device, various wires, such as a plurality of gate wires and a plurality of data wires, are extended and arranged between a plurality of sub-pixels, and a plurality of sub-pixels are connected to one signal wire. Accordingly, in the case of a general organic light emitting display device, various wiring such as gate wiring, data wiring, high potential power wiring, reference voltage wiring, etc. extend from one side of the organic light emitting display device to the other side without interruption on the substrate.

In contrast, in the case of the stretchable display device 100 according to an embodiment of the present invention, various wiring such as gate wiring, data wiring, high-potential power wiring, and reference voltage wiring made of a metal material are formed on a plurality of island substrates ( 111) It is placed only on the top. That is, in the stretchable display device 100 according to an embodiment of the present invention, various wirings made of metal materials are disposed only on the plurality of island substrates 111 and may not be formed to contact the lower substrate 110. there is. Accordingly, various wires may be patterned to correspond to the plurality of island substrates 111 and disposed discontinuously.

In the display device 100 according to an embodiment of the present invention, in order to connect these discontinuous wires, pads on two adjacent island substrates 111 may be connected by a connection wire 180. That is, the connection wire 180 electrically connects pads on two adjacent island substrates 111. Accordingly, the stretchable display device 100 of the present invention includes a plurality of connection wires to electrically connect various wires such as gate wires, data wires, high-potential power wires, reference voltage wires, etc. between the plurality of island substrates 111. It may include (180). For example, gate wiring may be disposed on a plurality of island substrates 111 arranged adjacent to each other in the X-axis direction, and gate pads 171 may be disposed at both ends of the gate wiring. At this time, each of the plurality of gate pads 171 on the plurality of island substrates 111 arranged adjacent to each other in the X-axis direction may be connected to each other by a connection wire 180 that functions as a gate wire. Accordingly, the gate wires arranged on the plurality of island substrates 111 and the connection wires 180 arranged on the lower substrate 110 may function as one gate wire. In addition, all various wires that may be included in the stretchable display device 100, such as data wires, high-potential power wires, reference voltage wires, etc., can also function as one wire by the connection wire 180 as described above. .

Referring to FIG. 2 , the first connection wire 181 may connect pads on two island boards 111 arranged side by side among the pads on a plurality of island boards 111 arranged adjacent to each other in the X-axis direction. The first connection wire 181 may function as a gate wire or a low-potential power wire, but is not limited thereto. For example, the first connection wire 181 may function as a gate wire, and the gate pad 171 on the two island substrates 111 arranged side by side in the X-axis direction through the contact hole formed in the bank 116. can be electrically connected. Accordingly, as described above, the gate pads 171 on the plurality of island substrates 111 arranged in the X-axis direction may be connected by the first connection wire 181 functioning as a gate wire, and one gate signal It can be delivered.

Referring to FIG. 2 , the second connection wire 182 may connect pads on two island boards 111 arranged side by side among the pads on a plurality of island boards 111 arranged adjacent to each other in the Y-axis direction. The second connection wire 182 may function as a data wire, a high-potential power wire, or a reference voltage wire, but is not limited thereto. For example, the second connection wire 182 may function as a data wire, and the data pad 173 on the two island boards 111 arranged side by side in the Y-axis direction through the contact hole formed in the bank 116. can be electrically connected. Accordingly, as described above, the data pads 173 on the plurality of island substrates 111 arranged in the Y-axis direction may be connected by a plurality of second connection wires 182 functioning as data wires, and may be connected as one data wire. Signals can be transmitted.

Referring to FIG. 2, the connection wire 180 includes a base polymer and conductive particles. Specifically, the first connection wire 181 includes a base polymer and conductive particles, and the second connection wire 182 includes a base polymer and conductive particles.

The first connection wire 181 is connected to the top and side surfaces of the bank 116 disposed on the island substrate 111, the planarization layer 115, the interlayer insulating layer 114, the buffer layer 112, and the plurality of island substrates 111. ) and may be formed to extend to the upper surface of the lower substrate 110. Accordingly, the first connection wire 181 is in contact with the upper surface of the lower substrate 110, the side surface of the neighboring island substrate 111, the buffer layer 112 disposed on the neighboring island substrate 111, and the gate insulator. It may be in contact with the side surfaces of the layer 113, the interlayer insulating layer 114, the planarization layer 115, and the bank 116. Additionally, the first connection wire 181 may contact the connection pad 172 disposed on the neighboring island substrate 111, but is not limited thereto.

The base polymer of the first connection wire 181 may be made of an insulating material that can be bent or stretched similarly to the lower substrate 110. The base polymer may include, for example, SBS (Styrene Butadiene Styrene), but is not limited thereto. Accordingly, when the stretchable display device 100 is bent or stretched, the base polymer may not be damaged. The base polymer may be formed by coating a material constituting the base polymer on the lower substrate 110 and the island substrate 111 or applying it using a slit.

Conductive particles of the first connection wire 181 may be dispersed in the base polymer. Specifically, the first connection wire 181 may include conductive particles dispersed at a constant concentration within the base polymer. For example, the first connection wire 181 is formed by uniformly stirring the conductive particles in the base polymer, then coating and curing the base polymer in which the conductive particles are dispersed on the lower substrate 110 and the island substrate 111. It may be formed in any way, but is not limited thereto. Conductive particles may include at least one of silver (Ag), gold (Au), and carbon, but are not limited thereto.

Conductive particles dispersed and disposed in the base polymer of the first connection wire 181 may form a conductive path that electrically connects the connection pads 172 disposed on neighboring island substrates 111. Additionally, a conductive path may be formed by electrically connecting the gate pad 171 formed on the outermost island substrate 111 among the plurality of island substrates 111 and the pad disposed in the non-display area (NA).

Referring to FIG. 2 , the base polymer of the first connection wire 181 and the conductive particles dispersed in the base polymer may connect pads disposed on adjacent island substrates 111 in a straight line. To this end, during the manufacturing process, the base polymer may be formed into a straight shape connecting pads disposed on each of the plurality of island substrates 111. Accordingly, the conductive path formed by the conductive particles dispersed in the base polymer may also be linear. However, the formation process and shape of the base polymer and conductive particles of the first connection wire 181 may not be limited thereto.

Referring to FIG. 2, the second connection wire 182 is connected to the top and side surfaces of the bank 116 disposed on the island substrate 111, a planarization layer 115, an interlayer insulating layer 114, a buffer layer 112, It may be formed to contact the side surfaces of the plurality of island substrates 111 and extend to the upper surface of the lower substrate 110. Accordingly, the second connection wire 182 is in contact with the upper surface of the lower substrate 110, the side surface of the neighboring island substrate 111, the buffer layer 112 disposed on the neighboring island substrate 111, and data insulation. It may be in contact with the side surfaces of the layer 113, the interlayer insulating layer 114, the planarization layer 115, and the bank 116. Additionally, the second connection wire 182 may contact the data pad 173 disposed on the neighboring island substrate 111, but is not limited thereto.

The base polymer of the second connection wire 182 may be made of an insulating material that can be bent or stretched similarly to the lower substrate 110, and may be the same material as the base polymer of the first connection wire 181. The base polymer may include, for example, SBS (Styrene Butadiene Styrene), but is not limited thereto.

Additionally, the conductive particles of the second connection wire 182 may be dispersed in the base polymer. Specifically, the second connection wire 183 may include conductive particles dispersed at a constant concentration in the base polymer. At this time, the concentration of the conductive particles dispersed on the upper part of the base polymer of the second connection wire 182 and the concentration of the conductive particles dispersed on the lower part of the base polymer may be substantially the same. Additionally, the manufacturing process of the second connection wire 181 may be the same as the manufacturing process of the first connection wire 181, and may be performed simultaneously.

Conductive particles dispersed in the base polymer of the second connection wire 182 may form a conductive path that electrically connects the data pads 173 disposed on neighboring island substrates 111. Additionally, a conductive path may be formed by electrically connecting the data pad 173 formed on the outermost island substrate 111 among the plurality of island substrates 111 and the pad disposed in the non-display area (NA).

Referring to FIG. 2 , the base polymer of the second connection wire 182 and the conductive particles dispersed in the base polymer may connect pads disposed on adjacent island substrates 111 in a straight line. To this end, during the manufacturing process, the base polymer may be formed into a straight shape connecting pads disposed on each of the plurality of island substrates 111. Accordingly, the conductive path formed by the conductive particles dispersed in the base polymer may also be linear. However, the formation process and shape of the base polymer and conductive particles of the second connection wire 182 may not be limited thereto.

In some embodiments, the conductive particles dispersed in the base polymer of the connection wire 180 may be arranged to be dispersed and have a concentration gradient within the base polymer. The concentration of conductive particles decreases from the top to the bottom of the base polymer, and therefore, the conductivity due to the conductive particles may be greatest at the top of the base polymer. Specifically, the conductive particles can be injected and dispersed into the base polymer using an ink printing process that uses a conductive precursor on the upper surface of the base polymer. In the process of injecting conductive particles into the base polymer, the polymer may swell several times, causing the conductive particles to penetrate into the empty space of the base polymer. Thereafter, the connection wiring 180 can be formed by dipping the base polymer injected with conductive particles into a reducing material or reducing it with vapor. Accordingly, the penetration area of the upper part of the base polymer may have a high enough concentration of conductive particles to form a conductive path. The thickness of the penetration area dispersed at a high concentration in the conductive particles on the top of the base polymer may vary depending on the time and intensity at which the conductive particles are injected from the top of the base polymer. For example, when the conductive particles are injected from the top of the base polymer. If the time or intensity is increased, the thickness of the penetration area can become thicker. Additionally, each conductive particle may contact each other on top of the base polymer, and thus a conductive path may be formed through the conductive particles in contact with each other, thereby allowing electrical signals to be transmitted.

Additionally, in some embodiments, the base polymer of the connection wiring 180 may be formed as a single layer on the lower substrate 110 between adjacent island substrates 111. Specifically, unlike what is shown in FIG. 2, the base polymer may be disposed as a single layer in contact with the lower substrate 110 in the area between the island substrates 111 that are closest to each other in the X-axis direction. The base polymer may be formed to overlap all of the plurality of pads formed side by side on one side of one island substrate 111. Additionally, the conductive particles may be formed separately to form a plurality of conductive paths on the base polymer arranged in one layer and correspond to each of the plurality of pads. Accordingly, the conductive path formed by the conductive particles can connect pads disposed on adjacent island substrates 111 in a straight line, for example, a base disposed as a single layer between a plurality of island substrates 111. Conductive particles can be injected into the polymer top surface to form four conductive paths.

Additionally, in some embodiments, the base polymer of the connection wire 180 may be disposed in the entire area excluding the area where the plurality of island substrates 111 are disposed. The base polymer may be disposed as a single layer in contact with the lower substrate 110 in the remaining area excluding the area overlapping with the plurality of rigid substrates, that is, the plurality of island substrates 111 among the lower substrate 110 . Accordingly, the remaining area of the lower substrate 110, excluding the area overlapping with the plurality of island substrates 111, may be covered by the base polymer, and the base polymer may be in contact with the pads of the plurality of island substrates 111, so that the base polymer may be in contact with the pads of the plurality of island substrates 111. A portion of the polymer may be disposed to cover the edges of the plurality of island substrates 111. Additionally, the conductive particles may form a conductive path connecting pads on a plurality of adjacent island substrates 111 on the base polymer.

When the base polymer is disposed as a single layer on the entire area of the lower substrate 110 except for the area where the plurality of island substrates 111 are disposed, the base polymer is disposed on the lower substrate 110 with the plurality of island substrates 111 Since it can be formed by applying it to all areas except the exposed area, a separate process for patterning the base polymer may not be necessary. Accordingly, the manufacturing process of the base polymer and the connecting wiring can be simplified, and the process cost and time can be reduced.

In addition, the base polymer is disposed as a single layer on the entire area of the lower substrate 110 except for the area where the plurality of island substrates 111 are disposed, thereby reducing the force applied when the stretchable display device 100 is bent or stretched. It can be dispersed. Additionally, in some embodiments, the top surface of the base polymer of the connecting wire 180 may be flat. Specifically, unlike what is shown in FIG. 3, the top surface of the base polymer of the connection wiring 180, such as the gate wiring and data wiring, may be higher than the top surface of the planarization layer 115 on the plurality of island substrates 111. Additionally, the top surface of the base polymer may be higher than the top surface of the banks 116 on the plurality of island substrates 111. Accordingly, the base polymer of the connection wiring 180 may have the same height of the upper surface of the portion overlapping with the plurality of island substrates 111 and the same height of the upper surface of the region disposed between the plurality of island substrates 111. Accordingly, the top surface of the connection wire 180 may be flat. Accordingly, the upper surface of the conductive particles dispersed on top of the base polymer may have the shape of a straight line without any bends in a cross-sectional view.

A step may exist between the upper surface of the bank 116 and the upper surface of the lower substrate 110 due to various components on the plurality of island substrates 111 spaced apart from each other on the lower substrate 110. In this case, the base polymer itself may be broken due to the step on the upper surface of the base polymer, which may block the electrical path between pads disposed on adjacent island substrates 111, and the defect rate of the stretchable display device may increase. You can.

At this time, if the upper surface of the base polymer is flat, the step between the upper surface of the devices arranged on the plurality of island substrates 111 and the upper surface of the lower substrate 110 on which the plurality of island substrates 111 are not arranged can be eliminated. there is. Accordingly, even if the stretchable display device 100 is bent or stretched, the connection wiring 180 including the base polymer and conductive particles is prevented from being broken due to a step. In addition, in the stretchable display device 100 according to another embodiment of the present invention, the top surface of the base polymer is flat, so damage to the connection wiring 180 during the manufacturing process of the stretchable display device 100 can be minimized. there is.

Referring again to FIG. 3, an upper substrate 120, a polarizing layer 190, and an upper adhesive layer 118 are disposed on the encapsulation layer 117 and the lower substrate 110.

The upper substrate 120 is a substrate that supports various components disposed below the upper substrate 120. The upper substrate 120 is a flexible substrate and may be made of an insulating material that can be bent or stretched. The upper substrate 120 is a flexible substrate and can be reversibly expanded and contracted. Additionally, the elastic modulus may be several MPa to hundreds of MPa, and the elongation failure rate may be 100% or more. The thickness of the upper substrate 120 may be 10um to 1mm, but is not limited thereto.

The upper substrate 120 may be made of the same material as the lower substrate 110, for example, silicone rubber such as polydimethylsiloxane (PDMS), polyurethane (PU), or PTFE ( It is made of an elastomer such as polytetrafluoroethylene, and therefore can have flexible properties. However, the material of the upper substrate 120 is not limited thereto.

The upper substrate 120 may be formed as a film type. Accordingly, pressure is applied to the upper substrate 120 and the lower substrate 110, and the upper substrate 120 and the lower substrate 110 can be bonded by the upper adhesive layer 118 disposed below the upper substrate 120. . However, the present invention is not limited to this, and the upper adhesive layer 118 may be omitted depending on the embodiment. Additionally, the upper substrate 120 may be formed using a coating method rather than a film type, and in this case, the upper adhesive layer 118 may be omitted.

A polarizing layer 190 is disposed on the upper substrate 120. The polarization layer 190 may polarize light incident from the outside of the stretchable display device 100. Polarized light that passes through the polarization layer 190 and is incident on the inside of the stretchable display device 100 may be reflected inside the stretchable display device 100, and thus its phase may be switched. Phase-converted light may not pass through the polarization layer 190. Accordingly, the light incident from the outside of the stretchable display device 100 into the inside of the stretchable display device 100 is not emitted again to the outside of the stretchable display device 100, so that the stretchable display device 100 )'s external light reflection can be reduced.

<Stretching characteristics by multiple island substrates>

Since a stretchable display device must have the property of being easily bent or stretched, attempts have been made to use a substrate with a small modulus and flexible properties. However, when a soft material such as polydimethylsiloxane (PDMS), which has a small modulus, is used as the lower substrate on which the display device is manufactured, the material that has a small modulus is weak to heat and is used to form transistors and display devices. A problem occurred in which the substrate was damaged due to high temperatures generated during the process, for example, temperatures above 100°C.

Accordingly, the display element must be formed on a substrate made of a material that can withstand high temperatures to prevent damage to the substrate during the process of forming the display element. Accordingly, attempts have been made to form a substrate with materials that can withstand the high temperatures generated during the manufacturing process, such as polyimide (PI), but materials that can withstand high temperatures have a large modulus and do not have ductility characteristics, so they are not stretchable. In the process of stretching the device, problems arose where the substrate was difficult to bend or stretch.

Accordingly, in the stretchable display device 100 according to an embodiment of the present invention, a plurality of island substrates 111, which are rigid substrates, are disposed only in the area where the transistor 150 or the organic light emitting device 160 is disposed to It is possible to prevent the plurality of island substrates 111 from being damaged by high temperatures in the manufacturing process of 150 or the organic light emitting device 160.

Additionally, in the stretchable display device 100 according to an embodiment of the present invention, a lower substrate 110 and an upper substrate 120, which are flexible substrates, may be disposed below and above the plurality of island substrates 111. Accordingly, the remaining areas of the lower substrate 110 and the upper substrate 120, excluding the areas overlapping with the plurality of island substrates 111, can be easily stretched or bent, so that the stretchable display device 100 can be implemented. there is. In addition, the transistor 150, the organic light emitting device 160, etc. disposed on the plurality of island substrates 111, which are rigid substrates, can be prevented from being damaged due to bending or stretching of the stretchable display device 100. .

<Effect of connection wiring>

Meanwhile, when the stretchable display device is bent or stretched, the lower substrate made of a flexible substrate may be deformed, and the island substrate made of a rigid substrate on which the organic light emitting device is disposed may not be deformed. In this case, if the wiring connecting each pad arranged on the plurality of island boards is not made of a material that bends or stretches easily, the wiring may be damaged, such as cracks, due to deformation of the lower board.

On the other hand, in the stretchable display device 100 according to an embodiment of the present invention, the pad disposed on each of the plurality of island substrates 111 is electrically connected to the connection wire 180 containing a base polymer and conductive particles. You can. The base polymer is ductile and can be easily deformed. Accordingly, in the stretchable display device 100 according to an embodiment of the present invention, even if the stretchable display device 100 is deformed, such as bending or stretching, the connection wiring 180 including the base polymer is connected to the plurality of island substrates. (111) This has the effect of allowing the region between them to be easily modified.

In addition, in the stretchable display device 100 according to an embodiment of the present invention, the connection wiring 180 includes conductive particles, so that damage such as cracks is prevented even by deformation of the base polymer in the conductive path made of conductive particles. This may not occur. For example, when the stretchable display device 100 is deformed, such as by bending or stretching, the lower substrate 110, which is a flexible substrate, is deformed in the remaining area except for the area where the plurality of island substrates 111, which are rigid substrates, are arranged. It can be. At this time, the distance between the plurality of conductive particles disposed on the deformed lower substrate 110 may change. At this time, the concentration of the plurality of conductive particles disposed on the base polymer and forming the conductive path can be maintained high so that the electrical signal can be transmitted even if the distance between the plurality of conductive particles increases. Therefore, even if the base polymer is bent or stretched, the conductive path by the plurality of conductive particles can smoothly transmit electrical signals, and even if the stretchable display device 100 is deformed, such as bending or stretching, electrical signals can be transmitted between each pad. It can be delivered.

In the stretchable display device 100 according to an embodiment of the present invention, the connection wire 180 includes a base polymer and conductive particles, thereby connecting pads disposed on a plurality of island substrates 111 adjacent to each other. The connecting wires 180 may be arranged in the shortest distance, that is, in a straight line. That is, the stretchable display device 100 can be implemented even if the connection wiring 180 is not formed in a curved shape. The conductive particles of the connection wire 180 are dispersed in the base polymer to form a conductive path. Additionally, as the stretchable display device 100 is deformed, such as by bending or stretching, the conductive path caused by the conductive particles may bend or stretch. In this case, the distance between the conductive particles is only changed, but the conductive path formed by the conductive particles can still transmit electrical signals. Accordingly, in the stretchable display device 100 according to an embodiment of the present invention, the space occupied by the connection wire 180 can be minimized.

<Lower substrate including multiple rigid patterns and flexible patterns>

Figure 4 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 400 of FIG. 4 is substantially the same as the stretchable display device 100 of FIGS. 1 to 3 except that the lower substrate 410 is different, and redundant description will be omitted. .

Referring to FIG. 4 , a lower substrate 410 supporting components of the stretchable display device 400 is disposed. In more detail, referring to FIG. 4 , the lower substrate 410 includes a plurality of first lower patterns 410A and second lower patterns 410B.

The plurality of first lower patterns 410A are disposed in an area that overlaps the plurality of island substrates 111 of the lower substrate 410. The plurality of first lower patterns 410A may be disposed below the plurality of island substrates 111 and their upper surfaces may be adhered to the lower surfaces of the plurality of island substrates 111 by the lower adhesive layer 419.

Additionally, the second lower pattern 410B is disposed in an area of the lower substrate 410 excluding the plurality of first lower patterns 410A. That is, the second lower pattern 410B may be arranged to surround the side and bottom surfaces of the plurality of first lower patterns 410A. However, the present invention is not limited thereto, and the second lower pattern 410B may be arranged on the same plane as the first lower pattern 410A. Additionally, the second lower pattern 410B may be adhered to the lower surface of the connection wire 180 by the lower adhesive layer 419. In addition, although not shown in FIG. 4, an additional adhesive layer may be used to adhere the first lower pattern 410A and the second lower pattern 410B.

At this time, the modulus of the plurality of first lower patterns 410A may be greater than the modulus of the second lower patterns 410B. Accordingly, the plurality of first lower patterns 410A may be a plurality of rigid lower patterns having stiffness compared to the second lower pattern 410B, and the second lower patterns 410B may be a plurality of first lower patterns 410A. ) It may be a soft lower pattern that has ductility compared to ). The modulus of the plurality of first lower patterns 410A may be 1000 times greater than the modulus of the second lower patterns 410B, but is not limited thereto.

The plurality of first lower patterns 410A may be made of the same material as the plurality of island substrates 111, and may be made of a plastic material with flexibility, for example, polyimide (PI). ) It may be made of polyacrylate, polyacetate, etc. However, the present invention is not limited thereto, and the plurality of first lower patterns 410A may be made of a material having a modulus equal to or smaller than the modulus of the plurality of island substrates 111 .

In addition, the second lower pattern 410B is a flexible lower pattern that can be reversibly expanded and contracted, has an elastic modulus of several MPa to hundreds of MPa, and a stretching failure rate of 100% or more. . Accordingly, the second lower pattern 410B may be made of an insulating material that can be bent or stretched, and the second lower pattern 410B may be made of silicone rubber such as polydimethylsiloxane (PDMS), or polyurethane. It may be made of an elastomer such as polyurethane (PU) or PTFE (polytetrafluoroethylene), but is not limited thereto.

Referring to FIG. 4, a plurality of island substrates 111 are disposed on the lower substrate 410. The plurality of island substrates 111 are disposed in an area that overlaps the first lower pattern 410A of the lower substrate 410. The plurality of island substrates 111 are spaced apart from each other and disposed on the lower substrate 410. At this time, the separation distance between the plurality of island substrates 111 and the separation distance between the plurality of first lower patterns 410A of the lower substrate 410 may be the same. In this way, the plurality of island substrates 111 are arranged at a certain distance apart, so that the plurality of island substrates 111 can be arranged in a matrix form on the lower substrate 410, as shown in FIGS. 1 and 2. , but is not limited to this. In addition, in FIG. 4, the size of the island substrate 111 is shown to be the same as the size of the first pattern 410A, but this is not limited, and the size of the first pattern 410A may be larger than the size of the island substrate 111. It may be possible.

In the stretchable display device 400 according to another embodiment of the present invention, the lower substrate 410 includes a plurality of first lower patterns 410A overlapping the plurality of island substrates 111 and a plurality of first lower patterns ( It includes second lower patterns 410B excluding 410A), and the modulus of the plurality of first lower patterns 410A is greater than the modulus of the second lower patterns 410B. When the stretchable display device 400 is deformed, such as by bending or stretching, the plurality of first lower patterns 410A disposed below the plurality of island substrates 111, which are rigid substrates, are a plurality of island substrates ( 111) can be supported. Accordingly, various elements disposed on the plurality of island substrates 111 may be supported by the plurality of first lower patterns 410A together with the plurality of island substrates 111, and the stretchable display device 400 may be deformed. As time goes by, damage can be reduced.

In addition, when the stretchable display device 400 is deformed, such as by bending or stretching, the plurality of first lower patterns 410A are made of the same material as the plurality of island substrates 111, and the modulus of the second lower pattern 410B is By having a higher modulus, the plurality of first lower patterns 410A may not be deformed, such as being stretched further than the plurality of island substrates 111, and the plurality of first lower patterns 410A and the plurality of island substrates 111 ) can be maintained firmly. Accordingly, in the stretchable display device 400 according to another embodiment of the present invention, the adhesion between the plurality of first lower patterns 410A and the plurality of island substrates 111 can be maintained strongly, and the stretchable display device 400 can be Even when the display device 400 is continuously deformed, such as being bent or stretched, the occurrence of defects in the stretchable display device 400 can be reduced.

In addition, the second lower pattern 410B, which does not overlap the plurality of island substrates 111, has softer characteristics compared to the plurality of first lower patterns 410A, so that the second lower pattern 410B between the plurality of island substrates 111 The area where the lower pattern 410B is disposed can be freely bent or stretched. Accordingly, the connection wire 180 disposed to overlap the second lower pattern 410B can also be bent or stretched more freely. Accordingly, deformation such as bending or stretching of the stretchable display device 400 according to another embodiment of the present invention can be performed more easily.

<Lower substrate including lower flexible substrate and rigid portion>

Figure 5 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. Figure 6 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention. Figure 7 is an image of the lower flexible substrate of a stretchable display device according to another embodiment of the present invention. The stretchable display device 500 of FIGS. 5 to 7 is substantially the same as the stretchable display device 400 of FIG. 4 except that the lower substrate 510 and the lower adhesive layer 519 are different. However, duplicate explanations will be omitted. In FIG. 7 , an image of the lower flexible substrate 510X is shown to express a more realistic structure of the lower flexible substrate 510X.

The lower substrate 510 may include a rigid region and a flexible region. Here, the rigid region is a region that is relatively rigid compared to the flexible region, and may be defined as an area that overlaps at least the island substrate 111. Additionally, the ductile region is an area that is relatively ductile compared to the rigid region and may be defined as an area other than the rigid region.

Referring to FIGS. 5 and 6 , the lower substrate 510 includes a lower flexible substrate 510X and a rigid portion 510Y on the lower flexible substrate 510X.

The lower flexible substrate 510X is disposed in the rigid region and the flexible region of the lower substrate 510. The lower flexible substrate 510X is a member for providing flexibility to the stretchable display device 500 and is made of silicone rubber such as polydimethylsiloxane (PDMS), urethane rubber, or polyurethane. It may be made of an elastomer such as polyurethane (PU) or PTFE (polytetrafluoroethylene), or a soft material such as polytetrafluoroethylene (PTFE), but is not limited thereto.

The rigid portion 510Y is disposed on the lower flexible substrate 510X in the rigid region of the lower substrate 510. Specifically, the rigid portion 510Y may be disposed along the upper surface of the lower flexible substrate 510X in the rigid region.

The rigid portion 510Y is a member for providing rigidity to the lower substrate 510 and may be made of a material that is more rigid than the lower flexible substrate 510X. Accordingly, the rigid portion 510Y may be made of a material with a higher modulus than the lower flexible substrate 510X. For example, the rigid portion 510Y is made of metal such as aluminum (Al), titanium (Ti), copper (Cu), molybdenum (Mo), aluminum (Al), titanium (Ti), copper (Cu), and molybdenum (Mo). ), metal alloys _{using metals} such as _aluminum oxide ( _Al Organic materials with higher rigidity than the substrate 510X, for example, polyimide (PI), polyacrylate, polyacetate, polyamide, epoxy, polycarbonate ( It can be made of one of the organic substances such as polycarbonate).

Referring to FIGS. 5 and 6 , the lower substrate 510 may have a plurality of grooves. At this time, a plurality of grooves may be formed in the lower flexible substrate 510X. The plurality of grooves may be arranged at regular intervals from the plurality of grooves in neighboring rows or columns on a plane, but is not limited thereto. Additionally, the plurality of grooves may be arranged to be staggered with respect to the plurality of grooves in adjacent rows or columns on a plane, but the present invention is not limited thereto.

Referring to FIG. 6, the cross-sectional shape of the plurality of grooves may be semicircular. Accordingly, the adhesive area between the lower adhesive layer 519 and the lower substrate 510 may be increased compared to the case where the lower substrate 510 does not include a plurality of grooves.

Referring to FIGS. 6 and 7 , the boundaries of each of the plurality of grooves of the lower flexible substrate 510X may have a sharp shape toward the upper side of the lower flexible substrate 510X, for example, a pincushion shape, but is limited to this. It doesn't work. That is, the boundaries of each of the plurality of grooves may have a flat upper surface.

Referring to FIG. 6, a lower adhesive layer 519 is disposed between the lower substrate 510 and the plurality of island substrates 111. Specifically, the lower adhesive layer 519 bonds the rigid portion 510Y of the lower substrate 510 and the island substrate 111 in the rigid region where the rigid portion 510Y is disposed, and in the flexible region where the rigid portion 510Y is not disposed. The connection wiring and the lower flexible substrate 510X of the lower substrate 510 are bonded.

The lower adhesive layer 519 may be arranged to fill a plurality of grooves. Specifically, the lower adhesive layer 519 includes the plurality of grooves of the lower flexible substrate 510X in the flexible region and the plurality of grooves of the lower flexible substrate 510X in the rigid region, excluding the portion where the rigid portion 510Y is disposed. It can be arranged to fill. Accordingly, the lower adhesive layer 519 may have a shape corresponding to the shape of the plurality of grooves.

The stretchable display device 500 according to another embodiment of the present invention has the lower substrate 510 having a plurality of grooves, so that the lower substrate 510 is connected to a plurality of island substrates through the lower adhesive layer 519. When bonded with (111), the bonding strength can be improved.

Stretchable display device (400) Stretchable display device (500) stiffness area soft area stiffness area soft area adhesive strength
[N/cm] 0.21 0.25 0.98 0.95

[Table 1] shows the adhesive strength measured in the rigid region and flexible region for each of the stretchable display device 400 shown in FIG. 4 and the stretchable display device 500 shown in FIGS. 5 to 7. This is a table showing the results. In the case of the stretchable display device 400 shown in FIG. 4, polyimide (PI) is used as the plurality of first lower patterns 410A of the lower substrate 410, and polyimide (PI) is used as the second lower pattern 410B. Polydimethylsiloxane (PDMS) was used, polyimide (PI) was used as the island substrate 111, and silicone adhesive was used as the lower adhesive layer 419. In the case of the stretchable display device 500 shown in FIGS. 5 to 7, polydimethylsiloxane (PDMS) is used as the lower flexible substrate 510X, and silicon oxide (SiOx) and silicon are used as the rigid portion 510Y. A nitride (SiNx) stacked structure was used, the distance between the grooves of the lower substrate 510 was 8㎛, the thickness of the lower flexible substrate 510X was 10㎛, and the thickness of the rigid portion 510Y was 1.2㎛. did. Additionally, the adhesive strength was measured using UTM equipment from Tinius Olson/H5KT.

Referring to [Table 1], the stretchable display device 500 shown in FIGS. 5 to 7 has an increase in both the rigid and flexible areas compared to the stretchable display device 400 shown in FIG. 4. , it can be seen that it has increased by about 4.7 times in the rigid region and by about 3.8 times in the soft region.

In the case of the stretchable display device 400 shown in FIG. 4, the upper surface of the lower substrate 410 is configured to be flat and is adhered to the plurality of island substrates 111 and the connection wires 180. Accordingly, the adhesive strength in both the rigid region and the flexible region may be relatively low. Therefore, when the lower substrate 410 has the structure shown in FIG. 4 and the stretchable display device 400 is repeatedly stretched, the first lower pattern 410A and the second lower pattern 410A of the lower substrate 410 The adhesion between the lower patterns 410B may decrease and the first lower pattern 410A and the second lower pattern 410B may be separated. In particular, since the first lower pattern 410AB and the second lower pattern 410B are made of different materials, the interfacial adhesion may be lower, thereby causing a peeling problem between the first lower pattern 410A and the second lower pattern 410B. In addition, when the stretchable display device 400 is repeatedly stretched, the adhesive force between the lower substrate 410 and the island substrate 111 is weakened, so that the plurality of island substrates 111 are formed on the lower substrate ( 410) may deviate from this.

However, in the stretchable display device 500 according to another embodiment of the present invention, a plurality of grooves are formed in the lower substrate 510 to increase the surface area where the lower substrate 510 is in contact with the lower adhesive layer 519. You can. Accordingly, the lower adhesive layer 519 is arranged to fill a plurality of grooves of the lower substrate 510, so that it can contact the lower substrate 510 over a wider area and promotes adhesion between the island substrate 111 and the lower substrate 510. Strength may be increased. Accordingly, even if the stretchable display device 500 is repeatedly stretched, the phenomenon of the island substrate 111 and the lower substrate 510 being separated from each other can be minimized.

In addition, in another stretchable display device 500 of the present invention, the rigid portion 510Y is disposed on the lower flexible substrate 510X in the rigid region, so that when the stretchable display device 500 is stretched, the lower substrate 510 ) can be made to be stretched relatively more easily than the rigid region. Therefore, by using the rigid portion 510Y, deformation such as the lower substrate 510 in the rigid region being stretched further than the island substrate 111 is prevented from occurring, so that the gap between the lower substrate 510 and the island substrate 111 in the rigid region is maintained. Adhesion can be maintained firmly.

<Various shapes of the lower substrate>

8A to 8D are schematic cross-sectional views of stretchable display devices according to various embodiments of the present invention. Compared to the stretchable display device 500 of FIGS. 5 to 7 , each of the stretchable display devices 800A, 800B, 800C, and 800D of FIGS. 8A to 8D has lower substrates 810A, 810B, 810C, and 810D. ) Only the shapes of the plurality of grooves and the lower adhesive layers 819A, 819B, 819C, and 819D are different, and other configurations are substantially the same, so redundant description will be omitted.

Referring to FIG. 8A, the cross-sectional shape of the plurality of grooves of the lower substrate 810A may have a triangular shape. Accordingly, the cross-sectional shape of the rigid portion 810YA disposed on the lower flexible substrate 810XA in the rigid region of the lower substrate 810A may also have a triangular shape. Accordingly, the lower adhesive layer 819A is arranged to fill between a plurality of triangular grooves disposed in the lower substrate 810A, so that the cross-sectional shape of the lower adhesive layer 819A may also have a triangular shape.

Referring to FIG. 8B, the cross-sectional shape of the plurality of grooves of the lower substrate 810B may have a shape corresponding to a convex semicircular shape. Specifically, the lower flexible substrate 810XB may include a plurality of protrusions corresponding to a convex semicircular shape, and the plurality of grooves may have a shape corresponding to an area where the plurality of protrusions are not disposed. Accordingly, the cross-sectional shape of the rigid portion 810YB disposed on the lower flexible substrate 810XB in the rigid region of the lower substrate 810B may also have a shape corresponding to a convex semicircular shape. Accordingly, the lower adhesive layer 819B may be arranged to fill the space between a plurality of grooves disposed on the lower substrate 810B.

Referring to FIG. 8C, the cross-sectional shape of the plurality of grooves of the lower substrate 810C may have a square shape. Accordingly, the cross-sectional shape of the rigid portion 810YC disposed on the lower flexible substrate 810XC in the rigid region of the lower substrate 810C may also have a square shape. Accordingly, the lower adhesive layer 819C is arranged to fill the space between the plurality of square-shaped grooves disposed in the lower substrate 810C, so that the cross-sectional shape of the lower adhesive layer 819C may also have a square shape.

Referring to FIG. 8D, the cross-sectional shape of the plurality of grooves of the lower substrate 810D may have a trapezoidal shape. Accordingly, the cross-sectional shape of the rigid portion 810YD disposed on the lower flexible substrate 810XD in the rigid region of the lower substrate 810D may also have a trapezoidal shape. Accordingly, the lower adhesive layer 819D is arranged to fill the space between the plurality of trapezoidal grooves disposed in the lower substrate 810D, so that the cross-sectional shape of the lower adhesive layer 819D may also have a trapezoidal shape.

Meanwhile, in FIGS. 8A to 8D, the cross-sectional shapes of the plurality of grooves of the lower substrates 810A, 810B, 810C, and 810D are shown to be triangular, semicircular, square, and trapezoidal, but the lower substrates 810A, 810B, There is no limit to this as long as the surface area of the upper surface of (810C, 810D) can be expanded. For example, the plurality of grooves of the lower substrates 810A, 810B, 810C, and 810D may have various cross-sectional shapes such as polygonal shapes, elliptical shapes, etc.

In addition, in FIGS. 8A to 8D, the cross-sectional shapes of the plurality of grooves of the lower substrates 810A, 810B, 810C, and 810D are shown to be the same. However, the cross-sectional shapes of the plurality of grooves of the lower substrates 810A, 810B, 810C, and 810D are different from each other. The shapes may be different from each other. For example, some of the grooves of the lower substrates 810A, 810B, 810C, and 810D may have a polygonal shape, and other grooves may have a circular shape. Additionally, a plurality of grooves having a larger cross-sectional area may be disposed in a ductile region that requires relatively greater ductility than a rigid region.

<Application of constant voltage to rigid part>

Figure 9 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 900 of FIG. 9 is different from the stretchable display device 500 of FIGS. 5 to 7 only in the configuration of the rigid portion 910Y, and other configurations are substantially the same, so there is no overlap. The explanation is omitted.

Referring to FIG. 9 , the rigid portion 910Y disposed on the lower flexible substrate 510X in the rigid region of the lower substrate 910 may be configured to be grounded. Accordingly, it is possible to prevent parasitic capacitance from occurring in the transistor 150 disposed on the rigid portion 910Y of the lower substrate 910. When the rigid portion 910Y is electrically floating, parasitic capacitance may be formed with the transistor 150 or other conductive components disposed on the rigid portion 910Y. Accordingly, in the stretchable display device 900 according to another embodiment of the present invention, the rigid portion 910Y is grounded to generate parasitic capacitance in the transistor 150 or capacitor disposed on the rigid portion 910Y of the lower substrate 910. can be prevented from occurring. Although not shown in FIG. 9, the rigid portion 910Y may receive a ground voltage through a separate wiring.

In some embodiments, the rigid portion 910Y may be configured to apply a constant voltage. That is, the rigid portion 910Y may be configured to apply a constant voltage through a high-potential power supply wire, a low-potential power supply wire, etc. As a constant voltage is applied to the rigid portion 910Y, parasitic capacitance as described above can be prevented from occurring.

<Lower flexible substrate containing multiple pores>

Figure 10 is an image of the lower flexible substrate of a stretchable display device according to another embodiment of the present invention. FIG. 11A is a cross-sectional view taken along line XI-XI' of FIG. 10. FIG. 11B is a cross-sectional view taken along line XII-XII' of FIG. 10. The stretchable display device 1000 of FIGS. 10 to 11B is different from the stretchable display device 500 of FIGS. 5 to 7 only in the shapes of the lower substrate 1010 and the lower adhesive layer 1019. However, since other configurations are substantially the same, redundant description will be omitted. In FIG. 10, area A is an image corresponding to the actual lower flexible substrate 1010X, and area B is a peel-off image of the upper part of the lower flexible substrate 1010X in area A to illustrate the inside of the lower flexible substrate 1010X. off) is an image.

10 to 11B, the lower flexible substrate 1010X may have a plurality of pores. Specifically, the lower flexible substrate 1010X may be disposed in a matrix form, and a plurality of pores communicating with each other may be disposed within the lower flexible substrate 1010X.

The plurality of pores of the lower flexible substrate 1010X may be of uniform size on a plane. At this time, the boundaries of each of the plurality of pores may be implemented in such a way that a sharp shape extending downward from the upper surface of the lower flexible substrate 1010X and a sharp shape extending upward from the lower surface of the lower flexible substrate 1010X are connected to each other. . That is, the boundaries of each of the plurality of pores of the lower flexible substrate 1010X may be formed such that a portion extending downward from the upper surface and a portion extending upward from the lower surface are connected to each other, but is not limited thereto. Additionally, the plurality of pores of the lower flexible substrate 1010X may be arranged to alternate with the plurality of pores arranged in adjacent rows or columns on a plane, and the plurality of pores may be connected to each other within the lower flexible substrate 1010X.

Referring to FIG. 11A, the shapes of the lower substrate 1010 and the lower adhesive layer 1019 in a cross-sectional view along the area where a plurality of pores are exposed are similar to the shapes of the lower substrate 510 and the lower adhesive layer in the cross-sectional view shown in FIG. 6 described above. It may be substantially the same as the shape of (519). However, referring to FIG. 11B, the shape of the lower substrate 1010 and the lower adhesive layer 1019 in the cross-sectional view along the area where the plurality of pores are not exposed is similar to the shape of the lower substrate 510 in the cross-sectional view shown in FIG. 6 described above. and the shape of the lower adhesive layer 519 may be different.

Referring to FIG. 11B, the lower flexible substrate 1010X has a plurality of pores, and the cross-section of the plurality of pores may be circular.

A plurality of pores of the lower flexible substrate 1010X may be formed by coating a hydrophobic polymer solution on a material constituting the lower flexible substrate 1010X in a wet-condition. By coating the material constituting the lower flexible substrate (1010X) with a hydrophobic polymer solution, the moisture at the coating interface can be uniformly aggregated, and by using this phenomenon to proceed with coating and curing, the lower part with uniform pores Flexible substrates (1010X) can be produced. Additionally, the lower flexible substrate 1010X can be manufactured by coating an in situ polymerized solution using uniform colloid polymer particles and subjecting it to forced-drying. However, the manufacturing process of the lower flexible substrate 1010X is not limited to this.

The rigid portion 1010Y may cover the surface of a plurality of pores of the lower flexible substrate 1010X in the rigid region. Specifically, the rigid portion 1010Y may be arranged to cover the surfaces of the plurality of pores along the surface of the lower flexible substrate 1010X. Accordingly, as shown in FIG. 11B, the rigid portion 1010Y may be arranged to cover the surface of the lower flexible substrate 1010X in the area where the plurality of pores are disposed.

The rigid portion 1010Y may be formed by applying or depositing a material constituting the rigid portion 1010Y into a plurality of pores of the lower flexible substrate 1010X and then removing the remaining portions except for necessary portions. When the rigid portion 1010Y is made of metal, inorganic material, or organic material, the rigid portion 1010Y may be formed through a patterning process, and the final shape may appear different depending on the matrix shape of the lower flexible substrate 1010X. there is. In addition, when the rigid portion 1010Y is composed of solvent-free resin, the rigid portion 1010Y is partially directly applied to the rigid area of the lower flexible substrate 1010X without performing a separate patterning process. A rigid portion 1010Y may be formed. However, the manufacturing process of the rigid portion 1010Y is not limited to this.

Referring to FIG. 11B, a lower adhesive layer 1019 is disposed between the lower substrate 1010, the plurality of island substrates 111, and the connection wiring 180. Specifically, the lower adhesive layer 1019 bonds the lower substrate 1010 and the island substrate 111 in the rigid area where the rigid portion 1010Y is disposed, and bonds the lower substrate 1010 and the connection wiring in the flexible area.

Additionally, the lower adhesive layer 1019 is arranged to fill a plurality of pores of the lower flexible substrate 1010X. That is, the lower adhesive layer 1019 is arranged to fill the space surrounded by the rigid parts 1010Y arranged in a plurality of pores in the rigid region of the lower substrate 1010 where the rigid parts 1010Y are disposed, and the rigid parts 1010Y are arranged. In the soft area that is not open, it is arranged to fill all of the plurality of pores. Accordingly, the lower adhesive layer 1019 may have a shape corresponding to a plurality of pores.

The stretchable display device 1000 according to another embodiment of the present invention configures a plurality of pores in the lower substrate 1010 to increase the surface area where the lower substrate 1010 contacts the lower adhesive layer 1019. You can. As shown in FIG. 11A, in the area where the plurality of pores are exposed, the lower adhesive layer 1019 may be arranged to fill the groove consisting of the plurality of pores of the lower substrate 1010. Additionally, as shown in FIG. 11B, in areas where the plurality of pores are not exposed, the lower adhesive layer 1019 may be arranged to fill the inside of the plurality of pores. Therefore, in the stretchable display device 1000 according to another embodiment of the present invention, the lower adhesive layer 1019 fills a plurality of pores of the lower substrate 1010, so that the lower substrate 1010 and the lower adhesive layer 1019 This contact surface area can be further increased. Accordingly, even if the stretchable display device 1000 is repeatedly stretched, the phenomenon of the island substrate 111 and the lower substrate 1010 being separated from each other can be minimized.

<Another embodiment with rigidity>

Figure 12 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 1200 of FIG. 12 is different from the stretchable display device 1000 of FIGS. 10 to 11B only in the shape of the rigid portion 1210Y, and other configurations are substantially the same, so there is no overlap. The explanation is omitted.

Referring to FIG. 12 , the rigid portion 1210Y may be arranged to fill a portion of a plurality of pores of the lower flexible substrate 1010X in the rigid region. That is, the rigid portion 1210Y may be disposed in a shape that fills a portion of the lower portion of the plurality of pores shown as circular in plan, but is not limited to this.

As described in FIGS. 10 to 11B, the rigid portion 1210Y may be formed by applying or depositing a material constituting the rigid portion 1210Y on the lower flexible substrate 1010X having a plurality of pores. At this time, it may be difficult to uniformly form the rigid portion 1210Y along the surface of the lower flexible substrate 1010X in areas where the plurality of pores are not exposed to the outside. Accordingly, the rigid portion 1210Y may be formed by filling the lower portion of the plurality of pores of the lower flexible substrate 1010X, as shown in FIG. 12 .

Referring to FIG. 12, the lower adhesive layer 1219 bonds the lower substrate 1210 and the island substrate 111 in the rigid area where the rigid portion 1210Y is disposed, and bonds the lower substrate 1210 and the connection wires in the flexible area. I order it.

Additionally, the lower adhesive layer 1219 may be arranged to fill the space remaining in the rigid region of the lower substrate 1210 where the rigid portion 1210Y is disposed, excluding the space where the rigid portion 1210Y is disposed in the plurality of pores. That is, the lower portion of the plurality of pores in the rigid region of the lower flexible substrate 1010X may be filled by the rigid portion 1210Y, and the upper portion may be filled by the lower adhesive layer 1219.

The stretchable display device 1200 according to another embodiment of the present invention forms a plurality of pores in the lower substrate 1210, and the lower adhesive layer 1219 fills the plurality of pores, thereby forming the lower substrate 1210. The surface area in contact between the and the lower adhesive layer 1219 can be increased. That is, the lower adhesive layer 1219 is arranged to fill the space in the plurality of pores in the rigid region where the rigid portion 1210Y is not disposed, and to fill all of the plurality of pores in the flexible region, so that the lower substrate 1210 and the lower adhesive layer ( 1219) can further increase the contact surface area. Accordingly, the adhesive strength between the island substrate 111 and the lower substrate 1210 can be increased, and even if the stretchable display device 1200 is repeatedly stretched, the island substrate 111 and the lower substrate 1210 are prevented from peeling off from each other. The phenomenon can be minimized.

<Connection board connecting multiple island boards>

Figure 13 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. Figure 14 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 1300 of FIGS. 13 and 14 has an additional connection substrate CS and a different connection wire 1380 compared to the stretchable display device 500 of FIGS. 5 and 7. Other than that, they are substantially the same, so redundant description will be omitted.

Referring to FIG. 13 , the stretchable display device 1300 includes a plurality of connection substrates CS disposed between a plurality of island substrates 1311 . The plurality of island substrates CS are substrates that connect adjacent island substrates 1311 to each other, and may be formed simultaneously and integrally from the same material as the island substrate 1311, but are not limited thereto.

Referring to FIG. 13, the plurality of connection substrates CS have a curved shape. For example, as shown in FIG. 13, the plurality of connection substrates CS may have a sinusoidal shape. However, the shape of the plurality of connection substrates CS is not limited to this. For example, the plurality of connection substrates CS may extend in a zigzag shape, and a plurality of diamond-shaped substrates may be connected and extend at the vertices. It can have various shapes, such as: Additionally, the number and shape of the plurality of connection substrates CS shown in FIG. 13 are exemplary, and the number and shape of the plurality of connection substrates CS may vary depending on the design, but are not limited thereto.

Referring to FIG. 13 , a plurality of connection wires 1380 are disposed on each of the plurality of connection substrates CS.

Referring to FIG. 13, the plurality of connection wires 1380 have a curved shape. The plurality of connection wires 1380 electrically connect pads disposed on neighboring island substrates 111 among the plurality of island substrates 111 and extend between each pad in a curved shape rather than a straight line. For example, as shown in FIG. 13, the plurality of connection wires 1380 may have a sine wave shape. However, the shape of the plurality of connection wires 1380 is not limited to this. For example, the plurality of connection wires 1380 may extend in a zigzag shape, and a plurality of diamond-shaped wires 1380 may be connected at the vertices. It can have various shapes, such as being extended.

Referring to FIGS. 13 and 14 , the plurality of connection substrates CS and the plurality of connection wires 1380 have shapes corresponding to each other. That is, the plurality of connection substrates CS may have the shape of a sine wave, and accordingly, the plurality of connection wires 1380 disposed on the plurality of connection substrates CS may also have the shape of a sine wave. However, the plurality of connection substrates CS may have a wider width than the plurality of connection wires 1380 in order to stably support the plurality of connection wires 1380 .

Referring to FIGS. 13 and 14 , the plurality of connection substrates CS may be adhered to the lower substrate 510 through the lower adhesive layer 1319 . Specifically, the plurality of connection substrates CS may be disposed to correspond to the flexible area of the lower substrate 510 and adhered to the lower substrate 510 by the lower adhesive layer 1319.

Referring to FIG. 14, a gate pad 1371 is formed on the gate insulating layer 113, and first connection wires 1381 are formed on the gate insulating layer 113 and the plurality of connection substrates CS.

Referring to FIG. 14 , the first connection wire 1381 that can function as a gate wire is connected to the gate pad 1371 and extends from the gate insulating layer 113 onto the plurality of connection substrates CS. Accordingly, the first connection wire 1381 may electrically connect the gate pads 1371 formed on each of the adjacent island substrates 111. The first connection wiring 1381 contacts the plurality of connection substrates CS between the plurality of island substrates 111 .

The first connection wire 1381 and the gate pad 1371 may be made of the same material as the gate electrode 151. Accordingly, the first connection wire 1381 and the gate pad 1371 may be formed simultaneously in the same process as the gate electrode 151. Accordingly, the first connection wire 1381 may extend from the gate pad 1371 and be integrally formed. However, the present invention is not limited thereto, and the gate pad 1371 and the first connection wire 1381 may be made of different materials, or may be placed on different layers and electrically connected to each other.

Referring to FIG. 14, a second connection wire 1382 that can function as a data wire is formed on the interlayer insulating layer 114. At this time, the source electrode 153 extends to the outside of the island substrate 111 to function as a data pad, and may be electrically connected to the second connection wire 1382. However, the data pad is not limited to this, and may be defined as a separately formed data pad extending from the source electrode 153 or electrically connected to the source electrode 153.

Additionally, the second connection wire 1382 is connected to the source electrode 153 and extends from the adjacent island substrate 111 onto the plurality of connection substrates CS. Accordingly, the second connection wire 1382 can electrically connect data pads formed on each of the adjacent island substrates 111. The second connection wiring 1382 contacts the plurality of connection substrates CS between the plurality of island substrates 111 .

The second connection wire 1382 may be made of the same material as the data pad, that is, the source electrode 153. Accordingly, the second connection wire 1382, the source electrode 153, and the drain electrode 154 can be formed simultaneously in the same process. Accordingly, the second connection wire 1382 may extend from the source electrode 153 and be integrally formed. However, the present invention is not limited thereto, and the second connection wire 1382 and the source electrode 153 may be made of different materials, or may be placed on different layers and electrically connected to each other.

In the stretchable display device 1300 according to another embodiment of the present invention, pads formed on the plurality of island substrates 111, such as the first connection wire 1381 and the second connection wire 1382, are electrically connected to each other. The connection wire 1380 may be made of the same material as at least one of the plurality of conductive components disposed on the plurality of island substrates 111. For example, the first connection wire 1381 may be made of the same material as the gate electrode 151, and the second connection wire 1382 may be made of the same material as the source electrode 153. However, the connection wiring 1380 is not limited to this, and in addition to the gate electrode 151 and the source electrode 153, the drain electrode 154, the anode 151 and the cathode 153 of the organic light emitting device 160 are connected. It may be made of the same material as the electrode of the light emitting device 160 and various wiring included in the stretchable display device 1300. Accordingly, in the stretchable display device 1300 according to another embodiment of the present invention, conductive components disposed on a plurality of island substrates 111 and made of the same material as the connection wiring 1380 are connected during the manufacturing process. Since the wiring 1380 can be formed simultaneously, a separate manufacturing process may not be required to form the connecting wiring 1380.

Hereinafter, FIGS. 15A and 15B will be referred to together for a more detailed description of the shape of the connection wiring 1380 disposed on the connection substrate CS.

<Connection board connecting multiple island boards>

15A and 15B are cross-sectional views of connection wiring according to various embodiments of the present invention. 15A and 15B show cross-sectional views of the flexible region of the lower substrate 510.

First, referring to FIG. 15A , the aspect ratio of the plurality of connection wires 1380A disposed on the plurality of connection substrates CS may be greater than 1. That is, the vertical length (b) of the plurality of connection wires 1380A is configured to be greater than the horizontal length (a), so that damage to the plurality of connection wires 1380A can be minimized when the stretchable display device 1300 is stretched. You can.

Additionally, referring to FIG. 15B, each of the plurality of connection substrates CS may include a buried portion. That is, the stretchable display device 1300 may have a structure in which a plurality of connection wires 1380B are buried in groove-shaped buried portions of a plurality of connection substrates CS. The aspect ratio of the plurality of connection wires 1380B embedded in the plurality of connection substrates CS may be greater than 1. That is, the vertical length (b) of the plurality of connection wires 1380 is configured to be greater than the horizontal length (a), so that damage to the plurality of connection wires 1380B can be minimized when the stretchable display device 1300 is stretched. You can.

In the stretchable display device 1300 according to another embodiment of the present invention, a plurality of curved connection substrates (CS) and a plurality of connection wires 1380 are arranged between the plurality of island substrates 111. , it is possible to minimize stress concentrated on the plurality of connection wires 1380 when the stretchable display device 1300 is stretched.

In the stretchable display device 1300 according to another embodiment of the present invention, a plurality of connection wires 1380 disposed on a plurality of connection substrates CS and a plurality of connection wires 1380 embedded in the plurality of connection substrates CS. By configuring the aspect ratio of the connection wires 1380 to be greater than 1, damage to the plurality of connection wires 1380 can be minimized when the stretchable display device 1300 is stretched. For example, when the aspect ratio of the plurality of connection wires 1380 is less than 1, when the stretchable display device 1300 is stretched, the deformation of the plurality of connection wires 1380 becomes relatively large, so that the plurality of connection wires 1380 ) may be damaged. Accordingly, by configuring the aspect ratio of the plurality of connection wires 1380 to be greater than 1, damage or breakage of the plurality of connection wires 1380 can be minimized when the stretchable display device 1300 is stretched.

<Stretchable display device including micro LED>

Figure 16 is a schematic cross-sectional view of one sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 1600 of FIG. 16 is substantially the same as the stretchable display device 500 of FIGS. 5 to 7 except that the LED 1660 is different, and thus redundant description will be omitted.

Referring to FIG. 16, a common wiring CL is disposed on the gate insulating layer 113. The common wiring CL is a wiring that applies a common voltage to the plurality of sub-pixels SPX. The common wiring CL may be made of the same material as the source electrode 153 and the drain electrode 154 of the transistor 150, but is not limited thereto.

And, a reflective layer 1683 is disposed on the interlayer insulating layer 114. The reflective layer 1683 is a layer for reflecting light emitted from the LED 1660 toward the lower substrate 110 toward the upper part of the stretchable display device 1600 to emit light to the outside. The reflective layer 1683 may be made of a metal material with high reflectivity.

An adhesive layer 1617 covering the reflective layer 1683 is disposed on the reflective layer 1683. The adhesive layer 1617 is a layer for adhering the LED 1660 to the reflective layer 1683, and may insulate the LED 1660 from the reflective layer 1683 made of a metal material. The adhesive layer 1617 may be made of a heat-curable material or a light-curable material, but is not limited thereto. In FIG. 16, the adhesive layer 1617 is shown to cover only the reflective layer 1683, but the placement position of the adhesive layer 1617 is not limited thereto.

An LED 1660 is disposed on the adhesive layer 1617. The LED 1660 is disposed to overlap the reflective layer 1683. The LED 1660 includes an n-type layer 1661, an active layer 1662, a p-type layer 1663, an n-electrode 1665, and a p-electrode 1664. Hereinafter, it will be described that an LED 1660 having a lateral structure is used as the LED 1660, but the structure of the LED 1660 is not limited thereto.

Specifically, the n-type layer 1661 of the LED 1660 is disposed to overlap the reflective layer 1683 on the adhesive layer 1617. The n-type layer 1661 can be formed by implanting n-type impurities into gallium nitride, which has excellent crystallinity. An active layer 1662 is disposed on the n-type layer 1661. The active layer 1662 is a light-emitting layer that emits light from the LED 1660, and may be made of a nitride semiconductor, for example, indium gallium nitride. A p-type layer 1663 is disposed on the active layer 1662. The p-type layer 1663 can be formed by implanting p-type impurities into gallium nitride. However, the constituent materials of the n-type layer 1661, the active layer 1662, and the p-type layer 1663 are not limited thereto.

A p-electrode 1664 is disposed on the p-type layer 1663 of the LED 1660. Additionally, an n-electrode 1665 is disposed on the n-type layer 1661 of the LED 1660. The n-electrode 1665 is arranged to be spaced apart from the p-electrode 1664. Specifically, in the LED 1660, an n-type layer 1661, an active layer 1662, and a p-type layer 1663 are sequentially stacked, a predetermined portion of the active layer 1662 and a p-type layer 1663 is etched, and an n-electrode is formed. It can be manufactured by forming (1665) and p-electrode (1664). At this time, the predetermined portion is a space for separating the n-electrode 1665 and the p-electrode 1664, and the predetermined portion may be etched to expose a portion of the n-type layer 1661. In other words, the surface of the LED 1660 on which the n-electrode 1665 and the p-electrode 1664 are to be disposed may have different height levels rather than a flat surface. Accordingly, the p electrode 1664 is disposed on the p-type layer 1663, the n electrode 1665 is disposed on the n-type layer 1661, and the p electrode 1664 and n electrode 1665 are at different height levels. are placed spaced apart from each other. Accordingly, the n electrode 1665 may be disposed closer to the reflective layer 1683 than the p electrode 1664. Additionally, the n electrode 1665 and the p electrode 1664 may be made of a conductive material, for example, a transparent conductive oxide. Additionally, the n electrode 1665 and the p electrode 1664 may be made of the same material, but are not limited thereto.

A planarization layer 115 is disposed on the interlayer insulating layer 114 and the adhesive layer 1617. The planarization layer 115 is a layer that planarizes the upper surface of the transistor 150. The planarization layer 115 may be disposed to flatten the upper surface of the planarization layer 115 in areas other than the area where the LED 1660 is disposed. At this time, the planarization layer 115 may be composed of two or more layers.

A first electrode 1681 and a second electrode 1682 are disposed on the planarization layer 115. The first electrode 1681 is an electrode that electrically connects the transistor 150 and the LED 1660. The first electrode 1681 is connected to the p electrode 1664 of the LED 1660 through a contact hole formed in the planarization layer 115. Additionally, the first electrode 1681 is connected to the drain electrode 154 of the transistor 150 through a contact hole formed in the planarization layer 115 and the interlayer insulating layer 114. However, the present invention is not limited thereto, and depending on the type of transistor 150, the first electrode 1681 may be connected to the source electrode 153 of the transistor 150. The p electrode 1664 of the LED 1660 and the drain electrode 154 of the transistor 150 are electrically connected by the first electrode 1681.

The second electrode 1682 is an electrode that electrically connects the LED 1660 and the common wiring CL. Specifically, the second electrode 1682 is connected to the common wiring (CL) through a contact hole formed in the planarization layer 115 and the interlayer insulating layer 114, and the LED ( It is connected to the n electrode 1665 of 1660). Accordingly, the common wiring CL and the n electrode 1665 of the LED 1660 are electrically connected.

When the stretchable display device 1600 is turned on, voltages at different levels may be applied to the drain electrode 154 of the transistor 150 and the common wiring CL. The voltage applied to the drain electrode 154 of the transistor 150 may be applied to the first electrode 1681, and a common voltage may be applied to the second electrode 1682. Voltages of different levels may be applied to the p electrode 1664 and the n electrode 1665 through the first electrode 1681 and the second electrode 1682, and thus the LED 1660 may emit light.

In FIG. 16, it is explained that the transistor 150 is electrically connected to the p electrode 1664 and the common wiring CL is electrically connected to the n electrode 1665, but this is not limited, and the transistor 150 is electrically connected to the n electrode 1665. It may be electrically connected to (1665) and the common wiring (CL) may be electrically connected to the p electrode (1664).

A bank 116 is disposed on the planarization layer 115, the first electrode 1681, and the second electrode 1682. The bank 116 is arranged to overlap the end of the reflective layer 1683, and a portion of the reflective layer 1683 that does not overlap the bank 116 may be defined as a light-emitting area. The bank 116 may be made of an organic insulating material and may be made of the same material as the planarization layer 115. Additionally, the bank 116 may be configured to include a black material to prevent color mixing from occurring when light emitted from the LED 1660 is transmitted to the adjacent sub-pixel (SPX).

A stretchable display device 1600 according to another embodiment of the present invention includes an LED 1660. Since the LED 1660 is made of an inorganic material rather than an organic material, it has excellent reliability and has a longer lifespan than a liquid crystal display device or an organic light emitting device. In addition, the LED (1660) not only has a fast lighting speed, but also has low power consumption, strong impact resistance, excellent stability, and excellent luminous efficiency, so it can display high-brightness images, making it a device suitable for application to ultra-large screens. . In particular, since the LED 1660 is made of an inorganic material rather than an organic material, the required encapsulation layer may not be used when using an organic light-emitting device. Accordingly, the encapsulation layer, which can easily generate cracks or be damaged during the process of stretching the stretchable display device 1600, can be omitted. Accordingly, the stretchable display device 1600 according to another embodiment of the present invention uses the LED 1660 as a display element, and may be damaged when the stretchable display device 1600 is deformed, such as bending or stretching. The use of the existing encapsulation layer can be omitted. In addition, since the LED 1660 is made of an inorganic material rather than an organic material, the display element of the stretchable display device 1600 according to another embodiment of the present invention can be protected from moisture or oxygen and has excellent reliability. can do.

Exemplary embodiments of the present invention may be described as follows.

In order to solve the problems described above, a stretchable display device according to an embodiment of the present invention includes a plurality of island substrates in which a plurality of pixels are defined and spaced apart from each other; a lower substrate disposed below the plurality of island substrates and having a plurality of grooves; a plurality of connection wires electrically connecting pads disposed on neighboring island substrates among the plurality of island substrates; and a lower adhesive layer disposed between the lower substrate and the plurality of island substrates to fill the plurality of grooves.

According to another feature of the present invention, the lower substrate includes a rigid region where a plurality of island substrates are disposed and a flexible region between the plurality of island substrates, and the lower substrate includes a rigid region and a lower flexible substrate disposed in the flexible region and a rigid region. The region may include a rigid portion disposed on the lower flexible substrate.

According to another feature of the present invention, the rigid portion may be disposed along the upper surface of the lower flexible substrate in the rigid region.

According to another feature of the present invention, the rigid portion may be arranged to fill a portion of a plurality of grooves in the rigid region.

According to another feature of the present invention, the rigid part may be configured to apply a constant voltage.

According to another feature of the present invention, the rigid portion may be made of one of metals, metal alloys, metal oxides, inorganic insulating materials, and organic materials with higher rigidity than the lower flexible substrate.

According to another feature of the present invention, the lower substrate includes a rigid region where a plurality of island substrates are disposed and a flexible region between the plurality of island substrates, and the lower substrate is disposed in the rigid region and the flexible region and has a plurality of pores ( It may include a lower flexible substrate having pores and a rigid portion that covers at least a portion of the surface of the plurality of pores of the lower flexible substrate in the rigid region.

According to another feature of the present invention, a plurality of pores may be connected to each other.

According to another feature of the present invention, the cross-sectional shape of the plurality of grooves may be at least one of a polygonal shape, a semicircular shape, and an elliptical shape.

According to another feature of the present invention, a stretchable display device includes a plurality of conductive components disposed on each of a plurality of island substrates; and a plurality of connection substrates connecting adjacent island substrates among the plurality of island substrates and each having a plurality of connection wires disposed thereon, wherein the plurality of connection substrates and the plurality of connection wires have a curved shape, and The connection wiring may be made of the same material as at least one of the plurality of conductive components.

According to another feature of the present invention, the aspect ratio of the plurality of connection wires disposed on the plurality of connection substrates may be greater than 1.

According to another feature of the present invention, each of the plurality of connection substrates may include a buried portion in which each of the plurality of connection wires is buried.

A stretchable display device according to another embodiment of the present invention includes a lower flexible substrate including a rigid region and a flexible region; A plurality of rigid substrates disposed on a lower flexible substrate in the rigid region and having a plurality of pixels defined thereon; a plurality of rigid parts disposed on the lower flexible substrate to overlap the plurality of rigid substrates; And it may include a lower adhesive layer that attaches the lower flexible substrate and the plurality of rigid parts to the plurality of rigid substrates.

According to another feature of the present invention, the lower flexible substrate may have a plurality of grooves, a plurality of rigid parts may be disposed in the plurality of grooves, and the lower adhesive layer may be arranged to fill the remaining space of the plurality of grooves.

According to another feature of the present invention, the lower flexible substrate may have a plurality of pores, a plurality of rigid parts may be disposed in some of the plurality of pores, and the lower adhesive layer may be disposed to fill the remaining space of the plurality of grooves.

According to another feature of the present invention, a constant voltage may be applied to the plurality of rigid parts.

According to another feature of the present invention, a stretchable display device includes a plurality of connection substrates integrated with the rigid substrate to connect adjacent rigid substrates among the plurality of rigid substrates; and a plurality of connection wires disposed on a plurality of rigid substrates and a plurality of connection substrates, wherein the plurality of connection substrates and the plurality of connection wires have a curved shape, and a plurality of connection wires disposed on the plurality of connection substrates. The vertical length of may be greater than the horizontal length.

According to another feature of the present invention, a plurality of connection wires may have a structure embedded in grooves of a plurality of connection substrates. According to another feature of the present invention, the rigid portion may be made of a material with higher rigidity than the lower flexible substrate.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100, 400, 500, 800A, 800B, 800C, 800D, 900, 1000, 1200, 1300, 1600: Stretchable display device
110, 510, 810A, 810B, 810C, 810D, 910, 1010, 1210: lower substrate
111, 1311: Island board
112: buffer layer
113: Gate insulating layer
114: Interlayer insulation layer
115: Flattening layer
116: bank
117: Encapsulation layer
118: upper adhesive layer
120: upper substrate
130: C.O.F.
131: base film
132: driver IC
140: printed circuit board
150: transistor
151: Gate electrode
152: active layer
153: source electrode
154: drain electrode
160: Organic light emitting device
161: anode
162: Organic light emitting layer
163: cathode
171, 971: gate pad
172: Connection pad
173: data pad
180, 1380, 1380A, 1380B: Connection wiring
181, 1381: first connection wiring
182, 1382: second connection wiring
190: Polarizing layer
410A: first lower pattern
410B: second lower pattern
419, 519, 819A, 819B, 819C, 819D, 1019, 1219, 1319: Lower adhesive layer
510X, 810XA, 810XB, 810XC, 810XD, 1010X, 1210X: Bottom flexible board
510Y, 810YA, 810YB, 810YC, 810YD, 910Y, 1010Y, 1210Y: Rigid section
CS: connection board
1660:LED
1661: n-type layer
1662: active layer
1663: p-type layer
1664: p electrode
1665: n-electrode
1617: Adhesive layer
1681: first electrode
1682: second electrode
1683: Reflective layer
CL: Common wiring

Claims (19)

A plurality of island substrates on which a plurality of pixels are defined and spaced apart from each other;
a lower substrate disposed below the plurality of island substrates and having a plurality of grooves disposed to overlap the plurality of island substrates;
a plurality of connection wires electrically connecting pads disposed on neighboring island substrates among the plurality of island substrates; and
A stretchable display device comprising a lower adhesive layer disposed between the lower substrate and the plurality of island substrates and filling the plurality of grooves. According to paragraph 1,
The lower substrate includes a rigid region where the plurality of island substrates are disposed and a flexible region between the plurality of island substrates,
The lower substrate includes a lower flexible substrate disposed in the rigid region and the flexible region, and a rigid portion disposed on the lower flexible substrate in the rigid region. According to paragraph 2,
The rigid portion is disposed along a top surface of the lower flexible substrate in the rigid region. According to paragraph 2,
The rigid portion is arranged to fill a portion of the plurality of grooves in the rigid region. According to paragraph 2,
A stretchable display device wherein the rigid part is configured to apply a constant voltage. According to paragraph 2,
A stretchable display device, wherein the rigid portion is made of one of metal, metal alloy, metal oxide, inorganic insulating material, and an organic material with higher rigidity than the lower flexible substrate. According to paragraph 1,
The lower substrate includes a rigid region where the plurality of island substrates are disposed and a flexible region between the plurality of island substrates,
The lower substrate is disposed in the rigid region and the flexible region and includes a lower flexible substrate having a plurality of pores and a rigid portion covering at least a portion of the surface of the plurality of pores of the lower flexible substrate in the rigid region. , stretchable display device. In clause 7,
A stretchable display device wherein the plurality of pores are connected to each other. According to paragraph 1,
A stretchable display device, wherein the cross-sectional shape of the plurality of grooves is at least one of a polygonal shape, a semicircular shape, and an elliptical shape. According to paragraph 1,
a plurality of conductive components disposed on each of the plurality of island substrates; and
It further includes a plurality of connection substrates connecting adjacent island substrates among the plurality of island substrates, and each of the plurality of connection wires is disposed,
The plurality of connection substrates and the plurality of connection wires have a curved shape,
The stretchable display device, wherein the plurality of connection wires are made of the same material as at least one of the plurality of conductive components. According to clause 10,
A stretchable display device, wherein the aspect ratio of the plurality of connection wires disposed on the plurality of connection substrates is greater than 1. According to clause 11,
Each of the plurality of connection substrates includes a buried portion in which each of the plurality of connection wires is buried. a lower flexible substrate including a rigid region and a flexible region;
a plurality of rigid substrates disposed on the lower flexible substrate in the rigid region and having a plurality of pixels defined thereon;
a plurality of rigid parts disposed on the lower flexible substrate to overlap the plurality of rigid substrates; and
A stretchable display device comprising: the lower flexible substrate and a lower adhesive layer that attaches the plurality of rigid parts to the plurality of rigid substrates. According to clause 13,
The lower flexible substrate has a plurality of grooves,
The plurality of rigid parts are disposed in the plurality of grooves,
The lower adhesive layer is arranged to fill the remaining space of the plurality of grooves. According to clause 13,
The lower flexible substrate has a plurality of pores,
The plurality of rigid parts are disposed in some of the plurality of pores,
The lower adhesive layer is arranged to fill the remaining space of the plurality of grooves. According to clause 13,
A stretchable display device configured to apply a constant voltage to the plurality of rigid parts. According to clause 13,
a plurality of connection substrates integrated with the rigid substrate to connect adjacent rigid substrates among the plurality of rigid substrates; and
Further comprising a plurality of connection wires disposed on the plurality of rigid substrates and the plurality of connection substrates,
The plurality of connection substrates and the plurality of connection wires have a curved shape,
A stretchable display device, wherein the vertical length of the plurality of connection wires disposed on the plurality of connection substrates is greater than the horizontal length. According to clause 17,
A stretchable display device, wherein the plurality of connection wires have a structure embedded in grooves of the plurality of connection substrates. According to clause 13,
A stretchable display device, wherein the rigid portion is made of a material with higher rigidity than the lower flexible substrate.

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