Patent Description:
<CIT> describes that an electronic device may have control circuitry coupled to input-output devices such as a display. A flexible input-output device may be formed from an elastomeric substrate layer. The substrate layer may have signal paths to which components are mounted. Openings may be formed in the elastomeric substrate layer between the signal paths to create a stretchable mesh-shaped substrate. The electrical components may each include an interposer having solder pads soldered to the elastomeric substrate. Electrical devices such as micro-light-emitting diodes may be soldered to the interposers. The electrical components may also include electrical devices such as sensors and actuators. A stretchable lighting unit may have a stretchable light guide illuminated by a stretchable light source.

<CIT> describes a stiffness local conversion stretchable substrate for applying to stretchable electronic devices such as skin patch type electronic devices, electronic skin, smart clothing, wearable electronic devices, slap-on devices, smart watches, and the like, and flexible electronic device packages using the same.

<CIT> describes a stretchable display device, a manufacturing method thereof and an electronic device. The stretchable display device includes a stretchable substrate, a stretchable wire, and a plurality of rigid islands. Both of the stretchable wire and the rigid islands are disposed on the stretchable substrate. Wherein, the plurality of rigid islands are disposed on the stretchable substrate at intervals; each rigid island is formed with a pixel package; the stretchable wire is connected to the pixel package to form a power supply circuit of the pixel package.

An organic light emitting display (OLED) that emits light by itself and a liquid crystal display (LCD) that requires separate light sources are currently used as display devices for a computer monitor, a TV and a mobile phone, etc..

The display devices have been applied in various fields including not only a computer monitor and a TV, but personal mobile devices, and the display devices having a wide active area and reduced volume and weight is currently studied.

Recently, a stretchable display device manufactured that can be stretched/contracted in a specific direction and changed into various shapes by forming a display unit, lines, etc. on a flexible substrate such as plastic that is a flexible material has been spotlighted as a next generation display device.

Accordingly, the present disclosure is directed to a stretchable display device that substantially obviates one or more of problems due to limitations and disadvantages of the prior art.

Additional features and advantages of the disclosure will be set forth in the description which follows and in part will be apparent from the description, or may be learned by practice of the invention. Other advantages of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

An object of the present disclosure is to provide a stretchable display device that can minimize stress that concentrates on the boundaries of a plurality of island substrates when the stretchable display device is stretched, by disposing an adhesive layer to overlap the boundaries of the plurality of island substrates.

Another object of the present disclosure is to provide a stretchable display device that can improve the adhesive strength of a first lower pattern and a second lower pattern that constitute a lower substrate by disposing an adhesive layer between the first lower pattern and the second lower pattern.

Another object of the present disclosure is to provide a stretchable display device that can minimize stress that is generated when the stretchable display device is stretched, by configuring an adhesive layer disposed between a first lower pattern and a second lower pattern as a multi-layer.

Another object of the present disclosure is to provide a stretchable display device that can minimize stress that concentrates on connecting lines when the stretchable display device is stretched, by disposing an adhesive layer under the connecting lines.

Objects of the present disclosure are not limited to the above-mentioned objects, and other objects, which are not mentioned above, can be clearly understood by those skilled in the art from the following descriptions. An invention is defined in the claims.

In order to achieve the objects of the present disclosure, a stretchable display device according to the invention is disclosed as recited in claim <NUM>.

Another stretchable display device includes: a plurality of rigid substrates in which a plurality of pixels is defined and that is spaced apart from each other; a flexible substrate disposed under the plurality of rigid substrates and including a plurality of rigid lower patterns and a flexible lower pattern; and a lower adhesive layer disposed to overlap boundaries of the plurality of rigid substrates, in which the lower adhesive layer may bond the plurality of rigid lower patterns, the flexible lower pattern, and the plurality of rigid substrates.

Other detailed matters of the present disclosure are included in the detailed description and the drawings.

The present disclosure has the effect of reducing stress that concentrates on boundaries of island substrates when a stretchable display device is stretched.

The present disclosure has the effect of being able to minimize separation of a plurality of island substrates from a lower substrate when a stretchable display device is stretched.

The present disclosure has the effect of reducing damage to connecting lines due to stress when a stretchable display device is stretched.

The present disclosure has the effect of reducing movement of display elements according to stretching of a stretchable display device.

Features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:.

Advantages and characteristics of the present disclosure and a method of achieving the advantages and characteristics will be clear by referring to exemplary embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed herein but will be implemented in various forms. The exemplary embodiments are provided by way of example only so that those skilled in the art can fully understand the disclosures of the present disclosure and the scope of the present disclosure. Therefore, the present disclosure will be defined only by the scope of the appended claims.

The shapes, sizes, ratios, angles, numbers, and the like illustrated in the accompanying drawings for describing the exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Further, in the following description of the present disclosure, a detailed explanation of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. The terms such as "including," "having," and "consist of" used herein are generally intended to allow other components to be added unless the terms are used with the term "only". Any references to singular may include plural unless expressly stated otherwise.

The terms "lower", "upper", "bottom" and "top", where referring to spatial positioning, are referenced to the typical orientation from which the display is viewed. That is to say that "upper" and "top" are closer to the typical viewing surface than "lower" and "bottom".

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

A stretchable display device may be referred to as a display device that can display images even if it bends or stretches. A stretchable display device may have high flexibility, as compared with conventional display devices. Accordingly, the shape of the stretchable display device may be freely changed in accordance with operation by the user such as bending or stretching the stretchable display device. For example, when a user holds and pulls an end of a stretchable display device, the stretchable display device can be stretched by the force of the user. Alternatively, when a user puts a stretchable display device on an uneven wall, the stretchable display device may be disposed to be bent into the surface shape of the wall. Further, when the force applied by a user is removed, the stretchable display device can return to the initial shape.

<FIG> is an exploded perspective view of a display device according to an example useful for understanding the present disclosure. Referring to <FIG>, a stretchable display device <NUM> includes a lower substrate <NUM>, a plurality of island substrates <NUM>, a plurality of connecting lines <NUM>, Chip on Films (COF) <NUM>, a printed circuit board <NUM>, an upper substrate <NUM>, and a polarizing layer <NUM>. The X-axis direction and Y-axis direction are positioned in a plane parallel to the display surface and are referenced to the typical viewing orientation.

The lower substrate <NUM> is a substrate for supporting and protecting various components of the stretchable display device <NUM>. The lower substrate <NUM>, which is a flexible substrate, may be made of a bendable or stretchable insulating material. For example, the lower substrate <NUM> may be made of silicon rubber such as polydimethylsiloxane (PDMS) or an elastomer such as polyurethane (PU) and polytetrafluoroethylene (PTFE), so it can have flexibility. The material of the lower substrate <NUM>, however, is not limited thereto.

The lower substrate <NUM>, which is a flexible substrate, may reversibly expand and contract. Further, an elastic modulus may be several to hundreds of MPa and a tensile fracture rate may be <NUM>% or more. The thickness of the lower substrate may be <NUM> to <NUM>, but is not limited thereto.

The lower substrate <NUM> may have an active area AA and a non-active area NA surrounding the active area AA.

The active area AA is an area where images are displayed on the stretchable display device <NUM>, and display elements and various driving elements for driving the display elements are disposed in the active area AA. The active area AA includes a plurality of pixels including a plurality of subpixels. The plurality of pixels is disposed in the active area AA and includes a plurality of display elements. The plurality of subpixels each can be connected with various lines. For example, the plurality of subpixels each can be connected with various lines such as a gate line, a data line, a high-potential power line, a low-potential power line, and a reference voltage line.

The non-active area NA is an area adjacent to the active area AA. The non-active area NA is an area disposed adjacent to the active area AA and surrounding the active area AA. The non-active area NA is an area where an image is not displayed, and lines, circuit units, etc. may be disposed in the non-active area NA. For example, a plurality of pads may be disposed in the non-active area NA and each of the pads may be connected with each of the subpixels in the active area AA.

The plurality of island substrates <NUM> is disposed on the lower substrate <NUM>. The plurality of island substrates <NUM>, which is rigid substrates, is spaced apart from each other and disposed on the lower substrate <NUM>. The plurality of island substrates <NUM> may be more rigid than the lower substrate <NUM>. That is, the lower substrate <NUM> may be softer than the plurality of island substrates <NUM> and the plurality of island substrates <NUM> may be more rigid than the lower substrate <NUM>.

The plurality of island substrates <NUM>, which is a plurality of rigid substrates, may be made of a plastic material having flexibility and, for example, may be made of polyimide (PI), polyacrylate, polyacetate, etc..

The modulus of the plurality of island substrates <NUM> may be higher than that of the lower substrate <NUM>. The modulus is an elastic modulus showing the ratio of deformation of a substrate caused by stress to stress applied to the substrate, and when the modulus is relatively high, the hardness may be relatively high. Accordingly, the plurality of island substrates <NUM> may be a plurality of rigid substrates that is more rigid than the lower substrate <NUM>. The modulus of the plurality of island substrates <NUM> may be at least a thousand times larger than that of the lower substrate <NUM>, but is not limited thereto.

The plurality of connecting lines <NUM> is disposed between the plurality of island substrates <NUM>. The connecting lines <NUM> may be disposed between the pads disposed on the plurality of island substrates <NUM> and may electrically connect each pad. The connecting lines <NUM> will be described in more detail with reference to <FIG>.

The COFs <NUM>, which are films having various components on flexible base films <NUM>, are components for supplying signals to the plurality of subpixels in the active area AA. The COFs <NUM> may be bonded to the plurality of pads disposed in the non-active area NA and supply a power voltage, a data voltage, a gate voltage, etc. to each of the plurality of subpixels in the active area AA through the pads. The COFs <NUM> include a base film <NUM> and a driving IC <NUM> and, in addition, the COFs <NUM> may include various other components.

The base films <NUM> are layers supporting the driving ICs <NUM> of the COFs <NUM>. The base films <NUM> may be made of an insulating material, for example, an insulating material having flexibility.

The driving ICs <NUM> are components that process data for displaying images and driving signals for processing the data. Although the driving ICs <NUM> are mounted in the type of the COF <NUM> in <FIG>, the driving ICs <NUM> are not limited thereto, and the driving ICs <NUM> may be mounted in the type of chip on glass (COG), tape carrier package (TCP), etc..

Controllers such as an IC chip and a circuit unit may be mounted on the printed circuit board <NUM>. Further, a memory, a processor, etc. also may be mounted on the printed circuit board <NUM>. The printed circuit board <NUM> has a configuration that transmits signals for driving the display elements from the controllers to the display elements.

The printed circuit board <NUM> is connected with the COFs <NUM>, so they can be electrically connected with each of the plurality of subpixels on the plurality of island substrates <NUM>.

The upper substrate <NUM> is a substrate overlapping the lower substrate <NUM> to protect various components of the stretchable display device <NUM>. The upper substrate <NUM>, which is a flexible substrate, may be made of a bendable or stretchable insulating material. For example, the upper substrate <NUM> may be made of a flexible material and may be made of the same material as the lower substrate <NUM>, but is not limited thereto.

The polarizing layer <NUM>, which has a configuration suppressing external light reflection of the stretchable display device <NUM>, may overlap the upper substrate <NUM> and may be disposed on the upper substrate <NUM>. However, the polarizing layer <NUM> is not limited thereto and, may be disposed under the upper substrate <NUM>, or may be omitted, depending on the configuration of the stretchable display device <NUM>.

<FIG> are referred to hereafter to describe in more detail the stretchable display device <NUM> according to an example useful for understanding the present disclosure.

<FIG> is an enlarged plan view of the stretchable display device according to an example useful for understanding the present disclosure. <FIG> is a schematic cross-sectional view of a subpixel of <FIG> is referred to for the convenience of description.

Referring to <FIG> and <FIG>, the plurality of island substrates <NUM> is disposed on the lower substrate <NUM>. The plurality of island substrates <NUM> is spaced apart from each other and disposed on the lower substrate <NUM>. For example, the plurality of island substrates <NUM>, as shown in <FIG> and <FIG>, may be disposed in a matrix shape on the lower substrate <NUM>, but is not limited thereto.

Referring to <FIG>, a buffer layer <NUM> is disposed on the plurality of island substrates <NUM>. The buffer layer <NUM> is formed on the plurality of island substrates <NUM> to protect various components of the stretchable display device <NUM> against permeation of water (H<NUM>O), oxygen (O<NUM>), etc. from the outside from the lower substrate <NUM> and the plurality of island substrates <NUM>. The buffer layer <NUM> may be made of an insulating material, and for example, may be a single inorganic layer or a multi-inorganic layer made of one of graphite, silicon nitride, silicon oxide (SiOx), silicon oxynitride (SiON), and the like. However, the buffer layer <NUM> may be omitted, depending on the structure or characteristics of the stretchable display device <NUM>.

In this regard, the buffer layer <NUM> may be formed only in the areas overlapping the plurality of island substrates <NUM>. As described above, since the buffer layers <NUM> may be made of an inorganic material, they may be easily damaged, such as cracking, when the stretchable display device <NUM> is stretched. Accordingly, the buffer layer <NUM> is patterned in the shape of the plurality of island substrates <NUM> without being formed in the areas between the plurality of island substrates <NUM>, whereby it can be formed only over the plurality of island substrates <NUM>. Therefore, since the buffer layer <NUM> is formed only in the areas overlapping the plurality of island substrates <NUM> that is rigid substrates, damage to the buffer layer <NUM> can be suppressed even though the stretchable display device <NUM> according to an embodiment of the present disclosure is deformed, such as, bending or stretching.

Referring to <FIG>, a transistor <NUM> including a gate electrode <NUM>, an active layer <NUM>, a source electrode <NUM>, and a drain electrode <NUM> is formed on the buffer layer <NUM>. For example, the active layer <NUM> is formed on the buffer layer <NUM>, and a gate insulating layer <NUM> for insulating the active layer <NUM> and the gate electrode <NUM> from each other is formed on the active layer <NUM>. An inter-layer insulating layer <NUM> is formed to insulate the gate electrode <NUM>, the source electrode <NUM>, and the drain electrode <NUM>, and the source electrode <NUM> and the drain electrode <NUM>, which are respectively in contact with the active layer <NUM> and are formed on the inter-layer insulating layer <NUM>.

The gate insulating layer <NUM> and the inter-layer insulating layer <NUM> may be formed only in the areas overlapping the plurality of island substrates <NUM> by patterning. The gate insulating layer <NUM> and the inter-layer insulating layer <NUM> may also be made of an inorganic material, like the buffer layer <NUM>, so they may be easily damaged such as cracking when the stretchable display device <NUM> is stretched. Accordingly, the gate insulating layer <NUM> and the inter-layer insulating layer <NUM> are patterned in the shape of the plurality of island substrates <NUM> without being formed in the areas between the plurality of island substrates <NUM>. Thus, they can be formed only on the plurality of island substrates <NUM>.

Only a driving transistor among various transistors that may be included in the stretchable display device <NUM> is shown in <FIG> for the convenience of description, but a switching transistor, a capacitor, etc. can also be included in the display device. Further, although the transistor <NUM> is described as having a coplanar structure in this specification, various transistors, for example, having a staggered structure also may be used.

Referring to <FIG>, a gate pad <NUM> is disposed on the gate insulating layer <NUM>. The gate pad <NUM> is a pad for transmitting a gate signal to a plurality of subpixels SPX. The gate pad <NUM> may be made of the same material as the gate electrode <NUM>, but is not limited thereto.

Referring to <FIG>, a planarization layer <NUM> is formed on the transistor <NUM> and the inter-layer insulating layer <NUM>. The planarization layer <NUM> planarizes the top of the transistor <NUM>. The planarization layer <NUM> may be composed of a single layer or a plurality of layers and may be made of an organic material. For example, the planarization layer <NUM> may be made of an acrylic-based organic material, but is not limited thereto. The planarization layer <NUM> may have a contact hole for electrically connecting the transistor <NUM> and an anode <NUM>, a contact hole for electrically connecting a data pad <NUM> and the source electrode <NUM>, and a contact hole for electrically connecting a connecting pad <NUM> and a gate pad <NUM>.

In some embodiments, a passivation layer may be formed between the transistor <NUM> and the planarization layer <NUM>. That is, the passivation layer covering the transistor <NUM> may be formed to protect the transistor <NUM> from permeation of water, oxygen, etc. The passivation layer may be made of an inorganic material and may be composed of a single layer or a multi-layer, but is not limited thereto.

Referring to <FIG>, the data pad <NUM>, the connecting pad <NUM>, and the organic light emitting element <NUM> are disposed on the planarization layer <NUM>.

The data pad <NUM> may transmit a data signal from a connecting line <NUM>, which functions as a data line, to a plurality of subpixels SPX. The data pad <NUM> is connected with the source electrode <NUM> of the transistor <NUM> through a contact hole formed at the planarization layer <NUM>. The data pad <NUM> may be made of the same material as the anode <NUM> of the organic light emitting element <NUM>, but is not limited thereto. Further, the data pad <NUM> may be made of the same material as the source electrode <NUM> and the drain electrode <NUM> of the transistor <NUM>, not on the planarization layer <NUM>, but on the inter-layer insulating layer <NUM>.

The connecting pad <NUM> can transmit a gate signal from a connecting line <NUM>, which functions as a gate line, to a plurality of subpixels SPX. The connecting pad <NUM> is connected with the gate pad <NUM> through contact holes formed at the planarization layer <NUM> and the inter-layer insulating layer <NUM> and transmits a gate signal to the gate pad <NUM>. The connecting pad <NUM> may be made of the same material as the data pad <NUM>, but is not limited thereto.

The organic light emitting elements <NUM> are components disposed to correspond to a plurality of subpixel SPX, respectively, and emitting light having a specific wavelength band. That is, the organic light emitting element <NUM> may be a blue organic light emitting element that emits blue light, a red organic light emitting element that emits red light, a green organic light emitting element that emits green light, or a white organic light emitting element that emits white light, but is not limited thereto. When the organic light emitting element <NUM> is a white organic light emitting element, the stretchable display device <NUM> may further include a color filter.

The organic light emitting element <NUM> includes an anode <NUM>, an organic light emitting layer <NUM>, and a cathode <NUM>. In detail, the anode <NUM> is disposed on the planarization layer <NUM>. The anode <NUM> is an electrode configured to supply holes to the organic light emitting layer <NUM>. The anode <NUM> 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 <NUM> may be made of the same material as the data pad <NUM> and the gate pad <NUM> disposed on the planarization layer <NUM>, but is not limited thereto. Further, when the stretchable display device <NUM> is implemented in a top emission type, the anode <NUM> may further include a reflective plate.

The anodes <NUM> are spaced apart from each other respectively for subpixels SPX and electrically connected with the transistor <NUM> through a contact hole of the planarization layer <NUM>. For example, although the anode <NUM> is electrically connected with the drain electrode <NUM> of the transistor <NUM> in <FIG>, the anode <NUM> may be electrically connected with the source electrode <NUM>.

A bank <NUM> is formed on the anode <NUM>, the data pad <NUM>, the connecting pad <NUM>, and the planarization layer <NUM>. The bank <NUM> is a component separating adjacent subpixels SPX. The bank <NUM> is disposed to cover at least partially both sides of adjacent anodes <NUM>, thereby partially exposing the top surface of the anode <NUM>. The bank <NUM> may perform a role in suppressing the problem that an unexpected subpixel SPX emits light or colors are mixed by light emitted in the lateral direction of the anode <NUM> due to concentration of a current on the corner of the anode <NUM>. The bank <NUM> may be made of acrylic-based resin, benzocyclobutene (BCB)-based resin, or polyimide, but is not limited thereto.

Although the organic light emitting element <NUM> is described as being used as a light emitting element in this specification, the present disclosure is not limited thereto and a light emitting diode (an LED) may be used as the light emitting element.

The bank <NUM> has a contact hole for connecting the connecting line <NUM> functioning as a data line and the data pad <NUM> and a contact hole for connecting the connecting line <NUM> functioning as a gate line and the connecting pad <NUM>.

The organic light emitting layer <NUM> is disposed on the anode <NUM>. The organic light emitting layer <NUM> is configured to emit light. The organic light emitting layer <NUM> may include a luminescent material, and the luminescent material may include a phosphorous material or a fluorescent material, but is not limited thereto.

The organic light emitting layer <NUM> may be composed of one light emitting layer. Alternatively, the organic light emitting layer <NUM> may have a stacked structure in which a plurality of light emitting layers is stacked with a charge generation layer therebetween. The organic light emitting layer <NUM> may further include at least one organic layer of a hole transporting layer, an electron transporting layer, a hole blocking layer, an electron blocking layer, a hole injection layer, and an electron injection layer.

Referring to <FIG> and <FIG>, the cathode <NUM> is disposed on the organic light emitting layer <NUM>. The cathode <NUM> supplies electrons to the organic light emitting layer <NUM>. The cathode <NUM> may be made of indium tin oxide (ITO)-based, indium zin oxide (IZO)-based, indium tin zinc oxide (ITZO)-based, zinc oxide (ZnO)-based, and tin oxide (TO)-based transparent conductive oxides or an Ytterbium (Yb) alloy. Alternatively, the cathode <NUM> may be made of a metal material.

The cathodes <NUM> may be formed by patterning to respectively overlap the plurality of island substrates <NUM>. That is, the cathodes <NUM> may be disposed not in the areas between the plurality of island substrates <NUM>, but only in the areas overlapping the plurality of island substrates <NUM>. Since the cathodes <NUM> are made of a material, such as, a transparent conductive oxide, a metal material, etc., when the cathodes <NUM> are formed even in the areas between the plurality of island substrates <NUM>, the cathodes <NUM> may be damaged when the stretchable display device <NUM> is stretched/contracted. Accordingly, the cathodes <NUM> may be formed to respectively correspond to the plurality of island substrates <NUM> on the plane. Referring to <FIG> and <FIG>, the cathodes <NUM> may be formed to have an area not overlapping the area where a connection line <NUM> is disposed, of the areas overlapping the plurality of island substrates <NUM>.

Unlike the conventional organic light emitting display devices, the cathodes <NUM> are formed by patterning to correspond to the plurality of island substrate <NUM> in the stretchable display device <NUM> according to an embodiment of the present disclosure. Accordingly, each of the cathodes <NUM> disposed on the plurality of island substrates <NUM> may be independently supplied with low-potential power through the connecting lines <NUM>.

Referring to <FIG> and <FIG>, an encapsulation layer <NUM> is disposed on the organic light emitting element <NUM>. The encapsulation layer <NUM> can seal the organic light emitting element <NUM> by covering the organic light emitting element <NUM> in contact with a portion of the top surface of the bank <NUM>. Accordingly, the encapsulation layer <NUM> protects the organic light emitting element <NUM> from water, air, or physical shock that may permeate from the outside.

The encapsulation layers <NUM> respectively cover the cathodes <NUM> patterned to respectively overlap the plurality of island substrate <NUM> and may be formed on the plurality of island substrates <NUM>, respectively. That is, the encapsulation layer <NUM> is disposed to cover one cathode <NUM> on one island substrate <NUM> and the encapsulation layers <NUM> disposed on each of the plurality of island substrates <NUM> may be spaced apart from each other.

The encapsulation layer <NUM> may be formed only in the areas overlapping the plurality of island substrates <NUM>. As described above, since the encapsulation layers <NUM> may be configured to include an inorganic layer, they may be easily damaged, such as cracking, when the stretchable display device <NUM> is stretched. In particular, since the organic light emitting element <NUM> is vulnerable to water or oxygen, when the encapsulation layer <NUM> is damaged, reliability of the organic light emitting element <NUM> may be reduced. Therefore, since the encapsulation layer <NUM> is not formed in the areas between the plurality of island substrates <NUM> in the stretchable display device <NUM> according to an embodiment of the present disclosure, damage to the encapsulation layer <NUM> can be minimized even though the stretchable display device <NUM> according to an embodiment of the present disclosure is deformed, such as, bending or stretching.

Compared with the conventional flexible organic light emitting display devices, the stretchable display device <NUM> according to an embodiment of the present disclosure has a structure in which the plurality of island substrates <NUM> that is relatively rigid is spaced apart from each other and disposed on the lower substrate <NUM> that is relatively soft. The cathodes <NUM> and the encapsulation layers <NUM> of the stretchable display device <NUM> are disposed by patterning to correspond to the plurality of island substrates <NUM>, respectively. That is, the stretchable display device <NUM> according to an embodiment of the present disclosure may have a structure that enables the stretchable display device <NUM> to be more easily deformed when a user stretches or bends the stretchable display device <NUM> and may have a structure that can minimize damage to the components of the stretchable display device <NUM> when the stretchable display device <NUM> is deformed.

The connecting lines <NUM> are lines that electrically connect the pads on the plurality of island substrates <NUM>. The connecting lines <NUM> include first connecting lines <NUM> and second connecting lines <NUM>. The first connecting lines <NUM> are lines extending in the X-axial direction of the connecting lines <NUM> and the second connecting lines <NUM> are lines extending in the Y-axial direction of the connecting lines <NUM>.

In the conventional organic light emitting display devices, various lines such as a plurality of gate lines and a plurality of data lines are extended and disposed between a plurality of subpixels, and a plurality of subpixels is connected to one signal line. Accordingly, in the conventional organic light emitting display devices, various lines such as gate lines, data lines, high-potential power lines, and reference voltage lines extend from a side to the other side of the organic light emitting display devices without disconnecting on the substrate.

However, in the stretchable display device <NUM> according to an embodiment of the present disclosure, various lines such as gate lines, data lines, high-potential power lines, and reference voltage lines, which are made of a metal material, are disposed only on the plurality of island substrates <NUM>. That is, in the stretchable display device <NUM> according to an embodiment of the present disclosure, various lines made of a metal material may be disposed only on the plurality of island substrates <NUM> and may not be formed to be in contact with the lower substrate <NUM>. Accordingly, various lines may be patterned to correspond to the plurality of island substrates <NUM> and discontinuously disposed.

In the stretchable display device <NUM> according to an embodiment of the present disclosure, the pads on two adjacent island substrates <NUM> may be connected by a connecting line <NUM> to connect the discontinuous lines. That is, a connecting line <NUM> electrically connects the pads on two adjacent island substrates <NUM>. Accordingly, the stretchable display device <NUM> of the present disclosure includes a plurality of connecting lines <NUM> to electrically connect various lines such as gate lines, data lines, high-potential power lines, and reference voltage lines between the plurality of island substrates <NUM>. For example, the gate lines may be disposed on a plurality of island substrates <NUM> disposed adjacent to each other in the X-axial direction, and the gate pads <NUM> may be disposed at both ends of the gate lines. At this time, each of the plurality of gate pads <NUM> on the plurality of island substrates <NUM> disposed adjacent to each other in the X-axial direction can be connected to each other by a connecting line <NUM> functioning as a gate line. Accordingly, the gate lines disposed on the plurality of island substrates <NUM> and the connecting lines <NUM> disposed on the lower substrate <NUM> may function as one gate line. Further, all various lines that may be included in the stretchable display device <NUM>, such as the data lines, high-potential power lines, and reference voltage lines, also each may function as one line by a connecting line <NUM>, as described above.

Referring to <FIG>, a first connecting line <NUM> may connect the pads on two parallel island substrates <NUM> of the pads of the plurality of island substrates <NUM> disposed adjacent to each other in the X-axial direction. The first connecting line <NUM> may function as a gate line or a low-potential power line, but is not limited thereto. For example, the first connecting line <NUM> may function as a gate line and may electrically connect the gate pads <NUM> on two X-axially parallel island substrates <NUM> through a contact hole formed at the bank <NUM>. Accordingly, as described above, the gate pads <NUM> on a plurality of island substrates <NUM> disposed in the X-axial direction may be connected by first connecting lines <NUM> that function as gate lines, and one gate signal may be transmitted.

Referring to <FIG>, a second connecting line <NUM> may connect the pads on two parallel island substrates <NUM> of the pads on the plurality of island substrates <NUM> disposed adjacent to each other in the Y-axial direction. The second connecting line <NUM> may function as a data line, a high-potential power line, or a reference voltage line, but is not limited thereto. For example, the second connecting line <NUM> may function as a data line and may electrically connect the data pads <NUM> on two Y-axially parallel island substrates <NUM> through a contact hole formed at the bank <NUM>. Accordingly, as described above, the data pads <NUM> on a plurality of island substrates <NUM> disposed in the Y-axial direction may be connected by a plurality of second connecting lines <NUM> that functions as data lines, and one data signal may be transmitted.

Referring to <FIG>, the connecting line <NUM> includes a base polymer and conductive particles. In detail, the first connecting line <NUM> includes a base polymer and conductive particles and the second connecting line <NUM> includes a base polymer and conductive particles.

The first connecting line <NUM> may be formed by extending to the top surface of the lower substrate <NUM> in contact with the top surface and a side surface of the bank <NUM>, and side surfaces of the planarization layer <NUM>, the inter-layer insulating layer <NUM>, and the buffer layer <NUM>, which are disposed on the island substrate <NUM>, and sides of the plurality of island substrates <NUM>. Accordingly, the first connecting line <NUM> may be in contact with the top surface of the lower substrate <NUM>, a side surface of an adjacent island substrate <NUM>, and side surfaces of the buffer layer <NUM>, the gate insulating layer <NUM>, the inter-layer insulating layer <NUM>, the planarization layer <NUM>, and the bank <NUM> disposed on the adjacent island substrate <NUM>. The first connecting line <NUM> may be in contact with the connecting pads <NUM> disposed on adjacent island substrates <NUM>, but is not limited thereto.

The base polymer of the first connecting line <NUM> may be made of a bendable or stretchable insulating material similar to the lower substrate <NUM>. The base polymer, for example, may include silicon rubber such as polydimethylsiloxane (PDMS), an elastomer such as polyurethane (PU) and polytetrafluoroethylene (PTFE)(), styrene butadiene styrene (SBS), etc., but is not limited thereto. Accordingly, when the stretchable display device <NUM> 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 or applying the material using a slit on the lower substrate <NUM> and an island substrate <NUM>.

The conductive particles of the first connecting line <NUM> may be distributed in the base polymer. In detail, the first connecting line <NUM> may include conductive particles distributed with predetermined density in the base polymer. The first connecting line <NUM>, for example, may be formed by uniformly stirring conductive particles in a base polymer and then coating or hardening the base polymer with the conductive particles distributed therein onto the lower substrate <NUM> and the island substrate <NUM>, but is not limited thereto. The conductive particles may include at least one of silver (Ag), gold (Au), and carbon, but is not limited thereto.

The conductive particles disposed and distributed in the base polymer of the first connecting line <NUM> may form a conductive path electrically connecting the connecting pads <NUM> each disposed on adjacent island substrates <NUM>. Further, the conductive particles may form a conductive path by electrically connecting a gate pad <NUM> formed on island substrates <NUM> disposed on the outermost island substrate <NUM> to a pad disposed in the non-active area NA.

Referring to <FIG>, the base polymer of the first connecting line <NUM> and the conductive particles distributed in the base polymer may connect in a straight shape the pads disposed on adjacent island substrates <NUM>. To this end, the base polymers may be formed in a straight shape connecting the pads disposed on each of the plurality of island substrates <NUM> in the manufacturing process. Accordingly, the conductive paths formed by the conductive particles distributed in the base polymers also may be a straight shape. However, the shape and the process of forming the base polymer and the conductive particles of the first connecting line <NUM> may not be limited thereto.

Referring to <FIG>, the second connecting line <NUM> may be formed by extending to the top surface of the lower substrate <NUM> in contact with the top surface and a side surface of the bank <NUM>, and side surfaces of the planarization layer <NUM>, the inter-layer insulating layer <NUM>, and the buffer layer <NUM>, which are formed on the island substrate <NUM>, and sides of the plurality of island substrates <NUM>. Accordingly, the second connecting line <NUM> may be in contact with the top surface of the lower substrate <NUM>, a side surface of an adjacent island substrate <NUM>, and side surfaces of the buffer layer <NUM>, the gate insulating layer <NUM>, the inter-layer insulating layer <NUM>, the planarization layer <NUM>, and the bank <NUM> disposed on the adjacent island substrate <NUM>. The second connecting line <NUM> may be in contact with the data pads <NUM> disposed on adjacent island substrates <NUM>, but is not limited thereto.

The base polymer of the second connecting line <NUM> may be made of a bendable or stretchable insulating material similar to the lower substrate <NUM>, and may be made of the same material as the base polymer of the first connecting line <NUM>. The base polymer, for example, may include silicon rubber such as polydimethylsiloxane (PDMS), an elastomer such as polyurethane (PU) and polytetrafluoroethylene (PTFE), styrene butadiene styrene (SBS), etc., but is not limited thereto.

Further, the conductive particles of the second connecting line <NUM> may be distributed in the base polymer. In detail, the second connecting line <NUM> may include conductive particles distributed with predetermined density in the base polymer. At this time, the conductive particles distributed at the upper portion and the lower portion in the base polymer of the second connecting line <NUM> may be substantially the same in density. The manufacturing process of the second connecting line <NUM> may be the same as that of the first connecting line <NUM> or may be simultaneously performed.

The conductive particles disposed and distributed in the base polymer of the second connecting line <NUM> may form a conductive path electrically connecting the data pads <NUM> respectively disposed on adjacent island substrates <NUM>. Further, the conductive particles may form a conductive path by electrically connecting a data pad <NUM> formed on the outermost island substrate <NUM> of a plurality of island substrates <NUM> to a pad disposed in the non-active area NA.

Referring to <FIG>, the base polymer of the second connecting line <NUM> and the conductive particles distributed in the base polymer may connect in a straight shape the pads disposed on adjacent island substrates <NUM>. To this end, the base polymers may be formed in a straight shape connecting between the pads disposed on each of the plurality of island substrates <NUM> in the manufacturing process. Accordingly, the conductive paths formed by the conductive particles distributed in the base polymers also may be a straight shape. However, the shape and the process of forming the base polymer and the conductive particles of the second connecting line <NUM> may not be limited thereto.

Referring to <FIG> again, the upper substrate <NUM> and the polarizing layer <NUM> are disposed on the encapsulation layer <NUM> and the lower substrate <NUM>.

The upper substrate <NUM> is a substrate supporting various components disposed under the upper substrate <NUM>. In detail, the upper substrate <NUM> may be formed by coating a material constituting the upper substrate <NUM> onto the lower substrate <NUM>, the island substrate <NUM>, and the connecting line <NUM> and then hardening the substrate. Accordingly, the upper substrate <NUM> may be disposed in contact with the lower substrate <NUM>, the island substrate <NUM>, and the connecting line <NUM>.

However, the present disclosure is not limited thereto, and the upper substrate <NUM> may be formed in a film type. Accordingly, the upper substrate <NUM> may be bonded by disposing a separate adhesive layer to the bottom surface of the upper substrate <NUM> and then laminating the upper substrate <NUM> and the adhesive layer to the lower substrate <NUM>, the island substrate <NUM>, and the connecting line <NUM>.

The upper substrate <NUM>, which is a flexible substrate, may be made of a bendable or stretchable insulating material. The upper substrate <NUM>, which is a flexible substrate, may reversibly expand and contract. Further, an elastic modulus may be several to hundreds of MPa and a tensile fracture rate may be <NUM>% or more. The thickness of the upper substrate <NUM> may be <NUM> to <NUM>, but is not limited thereto.

The upper substrate <NUM> may be made of the same material as the lower substrate <NUM>. For example, the upper substrate <NUM> may be made of silicon rubber such as polydimethylsiloxane (PDMS) or an elastomer such as polyurethane (PU) and polytetrafluoroethylene (PTFE), so it may have flexibility. The material of the upper substrate <NUM>, however, is not limited thereto.

The polarizing layer <NUM> is disposed on the upper substrate <NUM>. The polarizing layer <NUM> can polarize light incident into the stretchable display device <NUM> from the outside. The polarized light incident into the stretchable display device <NUM> through the polarizing layer <NUM> may be reflected in the stretchable display device <NUM>, so the phase of the light may be changed. The light with the changed phase may not pass through the polarizing layer <NUM>. Accordingly, the light incident into the stretchable display device <NUM> from the outside of the stretchable display device <NUM> is not discharged back to the outside of the stretchable display device <NUM>, so the external light reflection of the stretchable display device <NUM> may be reduced.

A stretchable display device needs an easily bending or stretching characteristic, so there have been attempts to use substrates that have a flexible property due to a small modulus. However, when a flexible material such as polydimethylsiloxane (PDMS) having a small modulus is used as a lower substrate that is disposed in the process of manufacturing display elements, there is a problem that the substrate is damaged by high temperature, for example, temperature over <NUM> that is generated in the process of forming transistors and the display elements due to the characteristic that a material having a small modulus is weak to heat.

Accordingly, the display elements should be formed on a substrate made of a material that can withstand high temperature, so damage to the substrate can be suppressed in the process of manufacturing the display elements. Accordingly, there have been attempts to manufacture a substrate using materials that can withstand high temperature, which is generated in the manufacturing process, such as polyimide (PI). However, the materials that can withstand high temperature do not have flexible properties due to large moduli, so the substrates are not easily bent or stretched when the stretchable display devices are stretched.

Therefore, since the plurality of island substrates <NUM> that is rigid substrates is disposed only in the areas where transistors <NUM> or organic light emitting elements <NUM> are disposed in the stretchable display device <NUM> according to an embodiment of the present disclosure, damage to the plurality of island substrates <NUM> due to high temperature in the process of manufacturing the transistors <NUM> or the organic light emitting elements <NUM> may be suppressed.

Further, the lower substrate <NUM> and the upper substrate <NUM> that are flexible substrates may be disposed under and over the plurality of island substrates <NUM> in the stretchable display device <NUM> according to an embodiment of the present disclosure. Accordingly, the other areas of the lower substrate <NUM> and the upper substrate <NUM> excepting the areas overlapping the plurality of island substrates <NUM> can be easily stretched or bent, so the stretchable display device <NUM> can be achieved. Further, it is possible to suppress the damage of the stretchable display device <NUM> by the transistors <NUM>, the organic light emitting elements <NUM>, etc. disposed on the plurality of island substrates <NUM> that is rigid substrates when the stretchable display device <NUM> is bent or stretched.

Meanwhile, when a stretchable display device is bent or stretched, a lower substrate that is a flexible substrate is deformed and island substrates that are rigid substrates on which organic light emitting elements are disposed may not be deformed. In this case, if the lines connecting each of the pads disposed on the plurality of island substrates are not made of an easily bendable or stretchable material, the lines may be damaged, such as cracking, due to deformation of the lower substrate.

Unlike this, in the stretchable display device <NUM> according to an embodiment of the present disclosure, it is possible to electrically connect the pads disposed on each of the plurality of island substrates <NUM>, using the connecting lines <NUM> including a base polymer and conductive particles. The base polymer is soft to be able to be easily deformed. Accordingly, the stretchable display device <NUM> of an embodiment of the present invention has an effect that even though the stretchable display device <NUM> is deformed such as bending or stretching, the areas between the plurality of island substrates <NUM> can be easily deformed by the connecting lines <NUM> including the base polymer.

Further, according to the stretchable display device <NUM> of an embodiment of the present invention, since the connecting lines <NUM> include conductive particles, the conductive paths composed of the conductive particles may not be damaged such as cracking even by deformation of the base polymer. For example, when the stretchable display device <NUM> is deformed such as bending or stretching, the lower substrate <NUM> that is a flexible substrate may be deformed in the other areas excepting the areas where the plurality of island substrates <NUM> that is rigid substrates is disposed. At this time, the distance between the conductive particles disposed on the deforming lower substrate <NUM> may be changed. At this time, the density of the plurality of conductive particles disposed at the upper portion of the base polymers and forming the conductive paths may be maintained at a high level to be able to transmit electrical signals even though the distance between the plurality of conductive particles is increased. Accordingly, even if the base polymers are bent or stretched, the conductive paths formed by the plurality of conductive particles may smoothly transmit electrical signals. Further, even though the stretchable display device <NUM> is deformed such as bending or stretching, electrical signals may be transmitted each between the pads.

In the stretchable display device <NUM> according to an embodiment of the present disclosure, since the connecting lines <NUM> include a base polymer and conductive particles, the connecting lines <NUM> respectively connecting the pads disposed on the plurality of adjacent island substrates <NUM> may be disposed in a straight shape to make a shortest distance. That is, the stretchable display device <NUM> may be achieved even if the connecting lines <NUM> are not formed in a curved shape. The conductive particles of the connecting lines <NUM> are distributed in the base polymers and form conductive paths. Further, when the stretchable display device <NUM> is deformed such as bending or stretching, the conductive paths formed by the conductive particles may be bent or stretched. In this case, only the distance between the conductive particles is changed and the conductive paths formed by the conductive particles can still transmit electrical signals. Therefore, in the stretchable display device <NUM> according to an embodiment of the present disclosure, it is possible to minimize the space occupied by the connecting lines <NUM>.

<FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. A stretchable display device <NUM> shown in <FIG> is substantially the same as the stretchable display device <NUM> shown in <FIG> except for having a different lower substrate <NUM> and lower adhesive layer <NUM>, so repeated description is not provided.

Referring to <FIG>, the lower substrate <NUM> supporting components of the stretchable display device <NUM> is disposed. In more detail, referring to <FIG>, the lower substrate <NUM> includes a plurality of first lower patterns 410Aand second lower patterns 410B.

A plurality of first lower patterns 410A is disposed in the areas overlapping a plurality of island substrates <NUM> on the lower substrate <NUM>. The plurality of first lower patterns 410A may be disposed under the plurality of island substrates <NUM> with the top surfaces bonded to the bottom surfaces of the plurality of island substrates <NUM> by a lower adhesive layer <NUM>.

Further, the second lower pattern 410B includes a plurality of grooves. In detail, the first lower pattern 410A and the lower adhesive layer <NUM> are disposed in the plurality of grooves of the second lower pattern 410B. That is, the second lower patterns 410B may be disposed to surround the side surfaces and the bottom surfaces of the plurality of first lower patterns 410A and the lower adhesive layer <NUM>. However, the second lower patterns 410B are not limited thereto and may be disposed in the same plane as the first lower patterns 410A. Further, the second lower substrate 410B may be in contact with the bottom surface of the connecting line <NUM>.

The plurality of first lower patterns 410A is larger in modulus than the second lower patterns 410B. Accordingly, the plurality of first lower patterns 410A may be a plurality of lower rigid patterns that is more rigid than the second lower patterns 410B, and the second lower patterns 410B may be flexible lower patterns that are more flexible than the plurality of first lower patterns 410A. The modulus of the plurality of first lower patterns 410A may be a thousand times or more larger than that 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 <NUM>, may be made of a plastic material having flexibility, and for example, may be made of polyimide (PI), polyacrylate, polyacetate, or the like. However, the plurality of first lower patterns 410A is not limited thereto and may be made of a material having a modulus that is the same as or smaller than that of the island substrates <NUM>.

The second lower patterns 410B, which are flexible lower substrates, may reversibly expand and contract and may have an elastic modulus of several to hundreds of MPa and a tensile fracture rate of <NUM>% or more. Accordingly, the second lower patterns 410B may be made of a bendable or stretchable insulating material and may be made of silicon rubber such as polydimethylsiloxane (PDMS) or an elastomer such as polyurethane (PU) and polytetrafluoroethylene (PTFE), but are not limited thereto.

Referring to <FIG>, the plurality of island substrates <NUM> is disposed on the lower substrate <NUM>. The plurality of island substrates <NUM> is disposed in areas overlapping the first lower patterns 410Aof the lower substrate <NUM>. The plurality of island substrates <NUM> is spaced apart from each other and disposed on the lower substrate <NUM>. The separation distance between the plurality of island substrates <NUM> and the separation distance between the plurality of first lower patterns 410A of the lower substrate <NUM> may be the same. For example, the plurality of island substrates <NUM> is spaced a predetermined distance apart from each other, so they may be disposed in a matrix shape on the lower substrate <NUM>, as shown in <FIG> and <FIG>, but are not limited thereto. Further, although the size of the island substrate <NUM> is shown as the same as the size of the first lower pattern 410A, the present disclosure is not limited thereto and the size of the first lower pattern 410A may be larger than the size of the island substrate <NUM>.

In the stretchable display device <NUM> according to another embodiment of the present disclosure, the lower substrate <NUM> includes the plurality of first lower patterns 410A overlapping the plurality of island substrates <NUM> and the second lower patterns 410B excepting the plurality of first lower patterns 410A. Further, the plurality of first lower patterns 410A is larger in modulus than the second lower patterns 410B. When the stretchable display device <NUM> is deformed such as bending or stretching, the plurality of first lower patterns 410A disposed under the plurality of island substrates <NUM> may support the plurality of island substrates <NUM> as rigid lower patterns. Accordingly, various elements disposed on the plurality of island substrates <NUM> may be supported together with the plurality of island substrates <NUM> by the plurality of first lower patterns 410A and damage to the elements due to deformation of the stretchable display device <NUM> may be reduced.

Further, as described above, the plurality of first lower patterns 410A is made of the same material as the plurality of island substrates <NUM> and has a modulus higher than the second lower patterns 410B. Accordingly, when the stretchable display device <NUM> is deformed such as bending or stretching, the plurality of first lower patterns 410A ise stretched more than the plurality of island substrates <NUM> without deformation, and the plurality of first lower patterns 410A and the plurality of island substrates <NUM> may keep firmly bonded to each other. Therefore, since the plurality of first lower patterns 410A and the plurality of island substrates <NUM> may keep firmly bonded to each other in the stretchable display device <NUM> according to another embodiment of the present disclosure, defect of the stretchable display device <NUM> can be reduced even if the stretchable display device <NUM> is continuously deformed such as bending or stretching.

Since the second lower patterns 410B not overlapping the plurality of island substrates <NUM> have a flexible property in comparison with the plurality of first lower patterns 410A, the areas where the second lower patterns 410B are disposed between the plurality of island substrates <NUM> may be freely bent or stretched. Accordingly, the connecting lines <NUM> disposed by overlapping the second lower patterns 410B also may be freely bent or stretched. Therefore, the stretchable display device <NUM> according to another embodiment of the present disclosure may be more easily deformed such as bending or stretching.

<FIG> is an enlarged plan view of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. <FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. The stretchable display device <NUM> of <FIG> and <FIG> is substantially the same as the stretchable display device <NUM> shown in <FIG> except for having a different lower substrate <NUM> and lower adhesive layer <NUM>, so repeated description is not provided.

First, referring to <FIG>, the lower substrate <NUM> is disposed under a plurality of island substrates <NUM> and connecting lines <NUM> and includes a plurality of first lower patterns 510A and a second lower pattern 510B. In this case, the plurality of first lower patterns 510A may be respectively disposed in a plurality of grooves of a second lower pattern 510B, the bottom surfaces of the plurality of first lower patterns 510A may be disposed so as to be in contact with the top surface of the second lower pattern 510B, and sides of the plurality of first lower patterns 510A may be disposed to be spaced apart from the second lower pattern 510B. Further, the top surfaces of the plurality of first lower patterns 510A may be disposed so as to be in contact with the bottom surfaces of the plurality of island substrates <NUM>.

Referring to <FIG> and <FIG>, the lower adhesive layer <NUM> may be disposed to overlap the boundary of a plurality of island substrate <NUM>. In detail, a portion of the lower adhesive layer <NUM> is disposed to overlap the plurality of island substrates <NUM> and the other potion is disposed to overlap a connecting line <NUM>, thereby being able to bond the plurality of island substrates <NUM> and the connecting line <NUM>. In detail, the top surface of the lower adhesive layer <NUM> may overlap the boundary of an island substrate <NUM>, and the top surface of the lower adhesive layer <NUM> disposed inside with respect to the boundary of the island substrate <NUM> may be in contact with the bottom surface of the island substrate <NUM>, and the top surface of the lower adhesive layer <NUM> disposed outside with respect to the boundary of the island substrate <NUM> may be in contact with the bottom surface of a connecting line <NUM>.

Referring to <FIG>, the lower adhesive layer <NUM> may be disposed between a plurality of first lower patterns 510A and second lower patterns 510B of the lower substrate <NUM>. In detail, the lower adhesive layer <NUM> may be disposed to overlap the boundaries of the plurality of island substrates <NUM> in the plurality of grooves of the second lower pattern 510B and to surround sides of the plurality of first lower patterns 510A. Accordingly, the lower adhesive layer <NUM> may bond the plurality of first lower patterns 510Aand second lower patterns 510B and may bond the plurality of island substrates <NUM> and the connecting lines <NUM>.

In this case, the lower adhesive layer <NUM> may be made of a material having a relatively low modulus. For example, the lower adhesive layer <NUM> has a lower modulus than a plurality of first lower patterns 510Aand second lower patterns 510B of the lower substrate <NUM>. Accordingly, the lower adhesive layer <NUM> is able to more easily attenuate stress that is generated when the stretchable display device <NUM> is stretched than the lower substrate <NUM>.

In general, when a stretchable display device is stretched, stress concentrates on the boundaries of a plurality of island substrates. Accordingly, when a stretchable display device is stretched, a plurality of island substrates and a lower substrate are separated from each other or the island substrates may be damaged due to the stress concentrating on the boundaries of the plurality of island substrates.

Accordingly, in the stretchable display device <NUM> according to another embodiment of the present disclosure, the lower adhesive layer <NUM> is disposed to overlap the boundaries of a plurality of island substrates <NUM>, thereby being able to minimize stress that concentrates on the plurality of island substrates <NUM> when the stretchable display device <NUM> is stretched. In detail, referring to <FIG> and <FIG>, the top surface of the lower adhesive layer <NUM> may overlap the boundary of an island substrate <NUM>, and the top surface of the lower adhesive layer <NUM> disposed inside with respect to the boundary of the island substrate <NUM> may be in contact with the bottom surface of the island substrate <NUM>, and the top surface of the lower adhesive layer <NUM> disposed outside with respect to the boundary of the island substrate <NUM> may be in contact with the bottom surface of a connecting line <NUM>. Further, since the lower adhesive layer <NUM> has a smaller modulus than the plurality of island substrates <NUM> and the lower substrate <NUM>, it may perform functions that reduce stress that concentrates on the island substrates <NUM> when the stretchable display device <NUM> is stretched and bonds the island substrates <NUM> and the lower substrate <NUM>. Accordingly, in the stretchable display device <NUM> according to another embodiment of the present disclosure, the lower adhesive layer <NUM> is disposed at the boundaries of the plurality of island substrates <NUM>, whereby it is possible to reduce stress that concentrates on the plurality of island substrates <NUM> when the stretchable display device <NUM> is stretched. Therefore, even though the stretchable display device <NUM> is repeatedly stretched, the phenomenon of separation of the island substrates <NUM> and the lower substrate <NUM> can be minimized.

<FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. A stretchable display device <NUM> of <FIG> is substantially the same as the stretchable display device <NUM> shown in <FIG> and <FIG> except for having a different lower substrate <NUM> and lower adhesive layer <NUM>, so repeated description is not provided.

Referring to <FIG>, a plurality of first lower patterns 710A and second lower patterns 710B are spaced apart from each other by lower adhesive layers <NUM> on a lower substrate <NUM>. That is, the plurality of first lower patterns 710Aand the second lower patterns 710B can be spaced apart from each other by disposing the lower adhesive layers <NUM> in a plurality of grooves of the second lower patterns 710B and disposing the plurality of first lower patterns 710A on the lower adhesive layer <NUM>.

Referring to <FIG>, the lower adhesive layers <NUM> may be disposed between the plurality of first lower patterns 710A and the second lower patterns 710B of the lower substrates <NUM>. In detail, the lower adhesive layers <NUM> are disposed to surround the side surfaces and the bottom surfaces of the plurality of first lower patterns 710A and the second lower patterns 710B are disposed to surround the side surfaces and the bottom surfaces of the lower adhesive layers <NUM>, whereby the plurality of first lower patterns 710A and the second lower patterns 710B can be bonded by the adhesive layers <NUM>.

In the stretchable display device <NUM> according to another embodiment of the present disclosure, the lower adhesive layers <NUM> may be disposed to surround the plurality of first lower patterns 710A and the second lower patterns 710B may be disposed to surround the lower adhesive layers <NUM>. Accordingly, the lower adhesive layers <NUM> are disposed so as to be in contact with all surfaces except for the surfaces where the plurality of first lower patterns 710A is in contact with the island substrates <NUM> and in contact with all inner surfaces of the grooves of the second lower patterns 710B. Accordingly, in the stretchable display device <NUM> according to another embodiment of the present disclosure, it is possible to effectively attenuate stress that concentrates on the boundaries of the plurality of island substrates <NUM> when the stretchable display device <NUM> is stretched, and it is possible to increase the adhesive strength of the plurality of first lower patterns 710A and the second lower patterns 710B. Accordingly, even though the stretchable display device <NUM> is repeatedly stretched, the phenomenon of separation of the island substrates <NUM> and the lower substrate <NUM> from each other and the phenomenon of separation of the plurality of first lower patterns 710A and the second lower patterns 710B of the lower substrate <NUM> from each other can be minimized.

<FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. The stretchable display device <NUM> of <FIG> is substantially the same as the stretchable display device <NUM> of <FIG> except that a protective member P and an upper adhesive layer <NUM> are further formed, so repeated description is not provided.

Referring to <FIG>, the stretchable display device <NUM> may further include an upper adhesive layer <NUM> and a protective member P.

First, the protective member P may be disposed to cover a display element such as the organic light emitting element <NUM>. In detail, the protective member P may be disposed to cover the organic light emitting element <NUM> and to be surrounded by the upper adhesive layer <NUM>. In this case, the protective member P is made of a material having the same modulus as the modulus of a plurality of island substrates <NUM>, so that it is possible to fix the organic light emitting element <NUM> that is moved in accordance with stretch of the stretchable display device <NUM>. However, the present disclosure is not limited thereto, and the protective member P may be omitted, depending on design of the stretchable display device <NUM>.

Referring to <FIG>, the upper adhesive layer <NUM> is disposed to cover the plurality of island substrates <NUM>, the organic light emitting element <NUM>, and portions of a plurality of connecting lines <NUM> disposed on the plurality of island substrates <NUM>. The upper adhesive layer <NUM> may be disposed to overlap the boundaries of the plurality of island substrates <NUM>. For example, in a plane surface, the upper adhesive layer <NUM> may be disposed to overlap a lower adhesive layer <NUM> and the upper adhesive layer <NUM> may have the same area as the lower adhesive layer <NUM>. The upper adhesive layer <NUM> may be made of the same modulus as a modulus of the lower adhesive layer <NUM>, but is not limited thereto.

Referring to <FIG>, an upper substrate <NUM> may be disposed to surround the upper adhesive layer <NUM>. In detail, the upper substrate <NUM> may be formed by coating on the upper adhesive layer <NUM>, the plurality of connecting lines <NUM>, and the lower substrate <NUM>.

In the stretchable display device <NUM> according to another embodiment of the present disclosure, the upper adhesive layer <NUM> may be disposed to cover a display element such as the organic light emitting element <NUM> and portions of the connecting lines <NUM>. In this case, the upper adhesive layer <NUM> may be disposed to overlap a lower adhesive layer <NUM> and the upper adhesive layer <NUM> may be made of a material having the same modulus as the modulus of the lower adhesive layer <NUM>. Accordingly, the stretchable display device <NUM> according to another embodiment of the present disclosure further includes the upper adhesive layer <NUM> and the upper adhesive layer <NUM> is disposed to cover the boundaries of the plurality of island substrates <NUM>. Therefore, it is possible to more effectively reduce the stress that concentrates on the boundaries of the plurality of island substrates <NUM> and the connecting lines <NUM> when the stretchable display device <NUM> is stretched. Accordingly, damage to the plurality of island substrates <NUM> and the connecting lines <NUM> can be minimized.

Further, in the stretchable display device <NUM> according to another embodiment of the present disclosure, the protective member P may be disposed between a display element such as the organic light emitting element <NUM> and the upper adhesive layer <NUM>. In this case, the protective member P may be made of a material having the same modulus as the modulus of the island substrates <NUM>. That is, the protective member P may be made of a material having a higher modulus than the upper adhesive layer <NUM>. Accordingly, the stretchable display device <NUM> according to another embodiment of the present disclosure, since the protective member P is disposed between a display element such as the organic light emitting element <NUM> and the upper adhesive layer <NUM>, it is possible to reduce movement of the organic light emitting element <NUM> when the stretchable display device <NUM> is stretched.

<FIG> is an enlarged plan view of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. The stretchable display device <NUM> of <FIG> is substantially the same as the stretchable display device <NUM> of <FIG> except for having a different lower adhesive layer <NUM>, so repeated description is not provided.

Referring to <FIG>, the lower adhesive layer <NUM> includes a first adhesive layer 919A and a plurality of second adhesive layers 919B protruding from the first adhesive layer 919A.

The first adhesive layer 919A is disposed between a plurality of first lower patterns 710A and second lower patterns 710B. In detail, the first adhesive layer 919A is disposed at the boundaries of a plurality of island substrates <NUM>, that is, a portion of the first adhesive layer 919A is disposed to overlap the plurality of island substrates <NUM> and the other portion is disposed to overlap connecting lines <NUM>, thereby being able to bond the plurality of island substrates <NUM> and the connecting lines <NUM>. The first adhesive layer 910A is substantially the same as the lower adhesive layer <NUM> described with reference to <FIG>, repeated description is not provided.

The second adhesive layers 919B may be defined as portions protruding from the first adhesive layer 919A in accordance with the shape of the plurality of connecting lines <NUM>. In detail, the second adhesive layer 919B may be disposed under the connecting lines <NUM> in accordance with the shapes in which the connecting lines <NUM> extend from each side of the first adhesive layer 919A.

In the stretchable display device <NUM> according to another embodiment of the present invention, the lower adhesive layer <NUM> is configured to include the first adhesive layer 919A and the second adhesive layer 919B, so it is possible to effectively reduce damage to the connecting lines <NUM> when the stretchable display device <NUM> is stretched. In detail, when the stretchable display device <NUM> is stretched, stress may concentrate not only at the boundaries of the plurality of island substrates <NUM>, but on the plurality of connecting lines <NUM>. Accordingly, in the stretchable display device <NUM> according to another embodiment of the present disclosure, the lower adhesive layer <NUM> is configured to include not only the first adhesive layer 919A disposed at the boundaries of the plurality of island substrates <NUM>, but the second adhesive layer 919B disposed on the bottom surface adjacent to the plurality of island substrates <NUM>, so it is also possible to effectively reduce damage to the connecting lines <NUM> when the stretchable display device <NUM> is stretched.

<FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. The stretchable display device <NUM> of <FIG> is substantially the same as the stretchable display device <NUM> of <FIG> except for having a different lower substrate <NUM> and lower adhesive layer <NUM>, so repeated description is not provided.

Referring to <FIG>, the lower adhesive layer <NUM> may include a plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c. In detail, the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c of the lower adhesive layer <NUM> may be sequentially disposed between a plurality of first lower patterns 1010A and second lower patterns 1010B.

Referring to <FIG>, the lower adhesive layer <NUM> may be composed of a first sub-lower adhesive layer 1019a, a second sub-lower adhesive layer 1019b, and a third sub-lower adhesive layer 1019c. In this case, the sub-lower adhesive layers 1019a, 1019b, and 1019c may be disposed to surround sub-lower adhesive layers 1019a, 1019b, and 1019c disposed at an upper side, respectively. In detail, the first sub-lower adhesive layer 1019a may be disposed to surround the plurality of first lower patterns 1010A of the lower substrate <NUM>, the second sub-lower adhesive layer 1019b may be disposed to surround the first sub-lower adhesive layer 1019a, and the third sub-lower adhesive layer 1019c may be disposed to surround the second sub-lower adhesive layer 1019b. In this case, the second lower pattern 1010B of the lower substrate <NUM> may be disposed to surround the third sub-lower adhesive layer 1019c. However, the number of the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c shown in <FIG> is an example, and the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c may be changed in various ways in accordance with design and is not limited thereto.

The modulus of each of the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c may decrease as it goes away from the plurality of island substrates <NUM>. In detail, the modulus of the second sub-lower adhesive layer 1019b may be smaller than the modulus of the first sub-lower adhesive layer 1019a and the modulus of the third sub-lower adhesive layer 1019c may be smaller than the modulus of the second sub-lower adhesive layer 1019b. Further, the modulus of the first sub-lower adhesive layer 1019a may be smaller than the modulus of the plurality of first lower patterns 1010A and the modulus of the second lower pattern 1010B may be smaller than the modulus of the third sub-lower adhesive layer 1019c. That is, the plurality of first lower patterns 1010A, the first sub-lower adhesive layer 1019a, the second sub-lower adhesive layer 1019b, the third sub-lower adhesive layer 1019c, and the second lower pattern 1010B may sequentially decrease in modulus.

In the stretchable display device <NUM> according to another embodiment of the present invention, the lower adhesive layer <NUM> is configured to include the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c, so it is possible to more effectively reduce stress that concentrates on the plurality of island substrates <NUM> when the stretchable display device <NUM> is stretched. In detail, the modulus of the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c may decrease as they go away from the plurality of island substrates <NUM>. That is, the modulus may decrease as it goes from the plurality of first lower patterns 1010A to the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c and the second lower pattern 1010B. Accordingly, when the lower adhesive layer <NUM> is composed of the plurality of sub-lower adhesive layers 1019a, 1019b, and 1019c, it is possible to effectively reduce stress that concentrates on the plurality of island substrates <NUM> when the stretchable display device <NUM> is stretched.

<FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. The stretchable display device <NUM> of <FIG> is substantially the same as the stretchable display device <NUM> of <FIG> except for having different island substrates <NUM>, connecting substrates CS, and connecting lines <NUM>, so repeated description is not provided.

Referring to <FIG>, the stretchable display device <NUM> further includes a plurality of connecting substrates CS. In detail, the plurality of connecting substrates CS is substrates that are disposed between a plurality of island substrates <NUM> and connects adjacent island substrates <NUM>. The plurality of connecting substrates CS may be simultaneously made of the same material as the island substrates <NUM>, but is not limited thereto.

Referring to <FIG>, each of the plurality of connecting lines <NUM> is disposed on each of the plurality of connecting substrates CS. The plurality of connecting substrates CS and the plurality of connecting lines <NUM> may have shapes corresponding to each other. For example, when the plurality of connecting substrates CS has the shape of a sine wave, the plurality of connecting lines <NUM> disposed on the plurality of connecting substrates CS may also have the shape of a sine wave. However, the plurality of connecting substrates CS may have a width larger than that of the plurality of connecting lines <NUM> to stably support the plurality of connecting lines <NUM>.

Referring to <FIG>, a lower adhesive layer <NUM> may be disposed at the boundaries of the plurality of connecting substrates CS. In detail, the lower adhesive layer <NUM> is disposed to overlap the boundaries where the plurality of island substrates <NUM> is in contact with the plurality of connecting substrates CS, thereby being able to bond the plurality of island substrates <NUM>, the plurality of connecting substrates CS, and the lower substrate <NUM>.

Referring to <FIG>, a gate pad <NUM> is formed on a gate insulating layer <NUM> and a first connecting line <NUM> is formed on the gate insulating layer <NUM> and a plurality of connecting substrates CS.

Referring to <FIG>, the first connecting line <NUM> that can function as a gate line is connected with the gate pad <NUM> and extends from the gate insulating layer <NUM> to the connecting substrates CS. Accordingly, the first connecting lines <NUM> may electrically connect the gate pads <NUM> respectively formed on adjacent island substrates <NUM>. The first connecting lines <NUM> are in contact with the plurality of connecting substrates CS between the plurality of island substrates <NUM>.

The first connecting line <NUM> and the gate pad <NUM> may be made of the same material as a gate electrode <NUM>. Accordingly, the first connecting line <NUM> and the gate pad <NUM> may be simultaneously formed in the same process as the gate electrode <NUM>. Accordingly, the first connecting line <NUM> may be integrally formed by extending from the gate pad <NUM>. However, the present disclosure is not limited thereto, and the gate pad <NUM> and the first connecting line <NUM> may be made of different materials, and may be disposed on different layers and electrically connected.

Referring to <FIG>, a second connecting line <NUM> that can function as a data line is formed on an inter-layer insulating layer <NUM>. At this time, the source electrode <NUM> may extend outside an island substrate <NUM>, may function as a data pad, and may be electrically connected with the second connecting line <NUM>. However, the present disclosure is not limited thereto, and a separate data pad may be defined as extending from the source electrode <NUM> or being electrically connected with the source electrode <NUM>.

The second connecting line <NUM> is connected with the source electrode <NUM> and extends from an adjacent island substrate <NUM> to the plurality of connecting substrates CS. Accordingly, the second connecting line <NUM> can electrically connect the data pad formed on each of adjacent island substrates <NUM>. The second connecting lines <NUM> are in contact with the plurality of connecting substrates CS between the plurality of island substrates <NUM>.

The second connecting line <NUM> may be made of the same material as a data pad, that is, the source electrode <NUM>. Accordingly, the second connecting line <NUM>, the source electrode <NUM>, and the drain electrode <NUM> may be simultaneously formed in the same process. Accordingly, the second connecting line <NUM> may be integrally formed by extending from the source electrode <NUM> However, the present disclosure is not limited thereto, and the second connecting line <NUM> and the source electrode <NUM> may be made of different materials and may be disposed on different layers and electrically connected.

In the stretchable display device <NUM> according to another embodiment of the present disclosure, connecting lines <NUM> electrically connecting pads formed on the plurality of island substrates <NUM>, such as the first connecting line <NUM> and the second connecting line <NUM>, may be made of the same material as at least one of a plurality of conductive components disposed on the plurality of island substrates <NUM>. For example, the first connecting line <NUM> may be made of the same material as the gate electrode <NUM> and the second connecting line <NUM> may be made of the same material as the source electrode <NUM>. However, the present disclosure is not limited thereto and the connecting lines <NUM> may be made of the same materials as, other than the gate electrode <NUM> and the source electrode <NUM>, a drain electrode <NUM>, the electrodes of an organic light emitting element <NUM> such as an anode <NUM> and a cathode <NUM> of the organic light emitting element <NUM>, and various lines included in the stretchable display device <NUM>. Accordingly, the connecting lines <NUM> may be simultaneously formed in the manufacturing process of conductive components disposed on the plurality of island substrates <NUM> and made of the same material as the connecting lines <NUM> in the stretchable display device <NUM> according to another embodiment of the present disclosure. Therefore, there may not be a need for a separate manufacturing process for forming the connecting lines <NUM>.

<FIG> is a schematic cross-sectional view of one subpixel of a stretchable display device according to another embodiment of the present disclosure, which is an embodiment of the invention. The stretchable display device <NUM> of <FIG> is substantially the same as the stretchable display device <NUM> of <FIG> except for having a different plurality of island substrates <NUM> and a different lower substrate <NUM>, so repeated description is not provided.

Referring to <FIG>, the plurality of island substrates <NUM> may further include a protrusion 1211B. In detail, the protrusion 1211B may protrude from bases 1211A of the plurality of island substrates <NUM> toward the lower portions of the plurality of island substrates <NUM> to have a step.

Referring to <FIG>, the protrusion 1211B may be disposed in a plurality of grooves of the lower substrate <NUM>. In detail, the protrusion 1211B may be disposed on lower adhesive layers <NUM> disposed in the plurality of grooves of the lower substrate <NUM>. That is, the lower adhesive layers <NUM> may be disposed to surround the protrusions 1211B of the plurality of island substrates <NUM> and the lower substrate <NUM> may be disposed to surround the lower adhesive layers <NUM>.

In the stretchable display device <NUM> according to another embodiment of the present disclosure, the plurality of island substrates <NUM> includes the protrusions 1211B, so the process may be simple and the process cost may be low when the plurality of island substrates <NUM> is manufactured. That is, since the plurality of island substrates <NUM> themselves includes the protrusions 1211B without using a separate lower pattern, a simpler process may be achieved.

The exemplary embodiments of the present disclosure can also be described as follows:.

According to an aspect of the present disclosure, a stretchable display device comprises a plurality of island substrates in which a plurality of pixels is defined and that is spaced apart from each other; a lower substrate disposed under the plurality of island substrates and including a plurality of grooves; a plurality of connecting lines electrically connecting pads disposed on adjacent island substrates of the plurality of island substrates; and a lower adhesive layer disposed under the plurality of island substrates and the plurality of connecting lines, wherein the lower adhesive layer is disposed to overlap the plurality of island substrates.

The lower substrate may include a second lower pattern including the plurality of grooves; and a plurality of first lower patterns disposed in the plurality of grooves, and wherein a modulus of the plurality of first lower patterns may be larger than a modulus of the second lower pattern.

The lower adhesive layer may be disposed between the plurality of first lower patterns and the second lower pattern.

Bottom surfaces of the plurality of first lower patterns and top surface of the second lower pattern may be in contact with each other, and the lower adhesive layer may be disposed to surround side surfaces of the plurality of first lower patterns, thereby bonding the plurality of first lower patterns and the second lower pattern.

The plurality of first lower patterns and the second lower pattern may be spaced apart from each other, and the lower adhesive layer may be disposed to surround the side surfaces and the bottom surfaces of the plurality of first lower patterns, thereby bonding the plurality of first lower patterns and the second lower pattern.

The stretchable display device may further comprise a display element disposed on the plurality of island substrates; an upper adhesive layer covering the plurality of island substrates and portions of the plurality of connecting lines; and an upper substrate disposed on the upper adhesive layer, the plurality of connecting lines, and the lower substrate, wherein the upper adhesive layer may be disposed to overlap boundaries of the plurality of island substrates.

The stretchable display device may further comprise a protective member disposed to cover the display element and surrounded by the upper adhesive layer, wherein a modulus of the protective member may be the same as a modulus of the plurality of island substrates.

A modulus of the upper adhesive layer may be the same as a modulus of the lower adhesive layer.

The lower adhesive layer may include a plurality of sub-lower adhesive layers, and a modulus of each of the plurality of sub-lower adhesive layers may decrease as it goes away from the plurality of island substrates.

The lower adhesive layer may include a first adhesive layer disposed between the plurality of first lower patterns and the second lower pattern; and a plurality of second adhesive layers protruding from the first adhesive layer in accordance with a shape of the plurality of connecting lines.

The plurality of island substrates may further include a protrusion disposed in the plurality of grooves.

The plurality of island substrates may be in contact with the plurality of connecting lines, the plurality of connecting lines may be in contact with the lower substrate, and a portion of a top surface of the lower adhesive layer may be in contact with the plurality of island substrates, and the other portion may be in contact with the plurality of connecting lines.

The stretchable display device may further comprise a plurality of conductive components disposed respectively on the plurality of island substrates; and a plurality of connecting substrates connecting adjacent island substrates of the plurality of island substrates and having the plurality of connecting lines thereon, wherein the plurality of connecting lines may be made of the same material as at least one of the plurality of conductive components, and a portion of a top surface of the lower adhesive layer may be in contact with the plurality of island substrates, and the other portion may be in contact with the plurality of connecting substrates.

A modulus of the lower adhesive layer may be smaller than a modulus of the lower substrate.

According to another aspect of the present disclosure, a stretchable display device comprises a plurality of rigid substrates in which a plurality of pixels is defined and that is spaced apart from each other; a flexible substrate disposed under the plurality of rigid substrates and including a plurality of rigid lower patterns and a flexible lower pattern; and a lower adhesive layer disposed to overlap boundaries of the plurality of rigid substrates, wherein the lower adhesive layer bonds the plurality of rigid lower patterns, the flexible lower pattern, and the plurality of rigid substrates.

The lower adhesive layer may be disposed to cover the plurality of rigid substrates.

The stretchable display device may further comprise a display element disposed on the plurality of rigid substrates; a plurality of connecting lines electrically connecting pads disposed on adjacent rigid substrates of the plurality of rigid substrates; an upper adhesive layer disposed to overlap boundaries of the plurality of rigid substrates; and an upper substrate disposed on the upper adhesive layer, the plurality of connecting lines, and the flexible substrate. The stretchable display device may further comprise a plurality of connecting substrates connecting adjacent rigid substrates of the plurality of rigid substrates and each having the plurality of connecting lines thereon, wherein a top surface of the lower adhesive layer may be in contact with all of the plurality of rigid substrates and the plurality of connecting substrates.

Claim 1:
A stretchable display device comprising:
a plurality of island substrates (<NUM>), the plurality of island substrates being spaced apart from each other and defining a plurality of pixels;
a lower substrate (<NUM>) disposed under the plurality of island substrates and including:
a plurality of first lower patterns (410A); and
a second lower pattern (410B);
wherein an elastic modulus of the plurality of first lower patterns (410A) is higher than that of the second lower pattern (410B); and
wherein each island substrate of the plurality of island substrates (<NUM>) is located on a respective first lower pattern of the plurality of first lower patterns (410A); and
a plurality of connecting lines (<NUM>) electrically connecting pads disposed on adjacent island substrates of the plurality of island substrates;
characterised by
the second lower pattern including a plurality of grooves, wherein the plurality of first lower patterns is disposed in the plurality of grooves, and
a lower adhesive layer (<NUM>) disposed to bond the plurality of first lower patterns (410A) and the plurality of island substrates, the lower adhesive layer (<NUM>) further being disposed under the plurality of connecting lines and under the plurality of island substrates (<NUM>),
wherein the lower adhesive layer is disposed to overlap the plurality of island substrates.