Stretchable display device

Abstract

The invention relates to a stretchable display device. A stretchable display device according to an exemplary embodiment of the present disclosure includes: a lower substrate in which a plurality of pixels are defined, the pixels including a plurality of sub-pixels; a plurality of island-like substrates disposed on the lower substrate and spaced apart from each other, each island-like substrate corresponding to a respective pixel; a plurality of connecting lines that electrically connect the pads provided in the adjacent island-shaped substrates among the plurality of island-shaped substrates; the upper base plate is arranged above the lower base plate; and a viewing angle panel disposed over the upper substrate and including a plurality of structures configured to deform during stretching, and each sub-pixel including a display element region, a first wiring region, a second wiring region, and a transparent region.

Description

Technical Field

[0001] This disclosure relates to an apparatus, and more particularly, for example, but not limited to, a stretchable display apparatus. Background Technology

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

[0003] The application of display devices has expanded to personal digital assistants, computer monitors, and televisions, and research is underway on display devices with large display areas and reduced size and weight.

[0004] In addition, recently, stretchable display devices have been gaining attention as the next generation of display devices. Stretchable display devices are manufactured by placing flexible display units and wiring lines on a flexible substrate (such as plastic) as a flexible material so that they can be stretched in a specific direction and changed in various forms. Summary of the Invention

[0005] The objective of this disclosure is to provide a stretchable display device that improves upon the resolution degradation caused by stretching of the stretchable display device.

[0006] Another objective of this disclosure is to provide a stretchable display device that suppresses damage or breakage caused by stretching of the stretchable display device.

[0007] Another objective of this disclosure is to provide a stretchable display device that improves the visibility of a slightly yellowish reflection in the wiring area.

[0008] The purpose of this disclosure is not limited to the foregoing, and other purposes not mentioned will be clearly understood by those skilled in the art from the following description.

[0009] To achieve the above objectives, according to one aspect of this disclosure, a stretchable display device includes: a lower substrate defining a plurality of pixels, each pixel including a plurality of sub-pixels; a plurality of island substrates disposed on the lower substrate and spaced apart from each other, each island substrate corresponding to a corresponding pixel; a plurality of connecting lines electrically connecting pads disposed in adjacent island substrates among the plurality of island substrates; an upper substrate disposed above the lower substrate; and a viewing angle panel disposed above the upper substrate and including a plurality of structures configured to deform during stretching. Each sub-pixel may include a display element region, a first wiring region, a second wiring region, and a transparent region.

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

[0011] According to this disclosure, a flexible viewing angle panel having a structure that deforms during stretching is disposed above a display panel to mitigate resolution degradation during stretching. Furthermore, the flexible viewing angle panel suppresses stress exceeding the tensile limit when the display panel is stretched, thereby preventing damage or breakage of the display panel due to stretching.

[0012] According to this disclosure, a corresponding structure is provided above the connecting line in the line area to improve the visibility of the slight yellow reflection caused by the connecting line.

[0013] The effects of this disclosure are not limited to those illustrated above, and many more effects are included in this specification.

[0014] Other systems, methods, features, and advantages will be apparent to those skilled in the art upon examination of the following figures and detailed description. All such additional systems, methods, features, and advantages are intended to be included within this specification, within the scope of this disclosure, and protected by the appended claims. Nothing in this section should be construed as limiting these claims. Other aspects and advantages are discussed below in conjunction with embodiments of this disclosure.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed disclosure concept. Attached Figure Description

[0016] The above and other aspects, features and advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 This is an exploded perspective view of a stretchable display device according to exemplary embodiments of the present disclosure;

[0018] Figure 2 This is an enlarged plan view of a stretchable display device according to a first exemplary embodiment of the present disclosure;

[0019] Figure 3 It is along the first exemplary embodiment of this disclosure. Figure 2 A cross-sectional view taken from line A-A';

[0020] Figure 4 This is based on a first exemplary embodiment of the present disclosure. Figure 3 A plan view of the viewing panel of a stretchable display device;

[0021] Figure 5This is based on a first exemplary embodiment of the present disclosure. Figure 3 A cross-sectional view of the stretchable display device after it has been stretched;

[0022] Figure 6 This is based on a first exemplary embodiment of the present disclosure. Figure 4 The view panel is a stretched planar view;

[0023] Figure 7 It is a graph showing the brightness according to the viewing angle according to a first exemplary embodiment of the present disclosure;

[0024] Figure 8 This is a cross-sectional view of a stretchable display device according to a second exemplary embodiment of the present disclosure;

[0025] Figure 9 This is a second exemplary embodiment according to the present disclosure. Figure 8 A plan view of the viewing panel of a stretchable display device;

[0026] Figure 10 This is a second exemplary embodiment according to the present disclosure. Figure 8 A cross-sectional view of the stretchable display device after it has been stretched;

[0027] Figure 11 This is a second exemplary embodiment according to the present disclosure. Figure 9 The view panel is a stretched planar view;

[0028] Figure 12 This is a plan view of a stretchable display device according to a third exemplary embodiment of the present disclosure;

[0029] Figure 13 It is according to the third exemplary embodiment of this disclosure. Figure 12 A cross-sectional view taken from line B-B';

[0030] Figure 14 This is based on a third exemplary embodiment of the present disclosure. Figure 13 A plan view of the viewing panel of a stretchable display device;

[0031] Figure 15 This is based on a third exemplary embodiment of the present disclosure. Figure 13 A cross-sectional view of the stretchable display device after it has been stretched;

[0032] Figure 16 This is based on a third exemplary embodiment of the present disclosure. Figure 14 The view panel is a stretched planar view;

[0033] Figure 17 This is a plan view of a stretchable display device according to a fourth exemplary embodiment of the present disclosure;

[0034] Figure 18 It is along the fourth exemplary embodiment of this disclosure. Figure 17 The cross-sectional view taken at C-C'; and

[0035] Figure 19 This is according to the fourth exemplary embodiment of this disclosure. Figure 17 A cross-sectional view of the stretchable display device after it has been stretched.

[0036] Throughout the accompanying drawings and detailed description, unless otherwise described, the same reference numerals shall be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative dimensions and illustrations of these elements may be enlarged. Detailed Implementation

[0037] Reference will now be made in detail to embodiments of this disclosure, examples of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations relevant to this document will be omitted or may be briefly discussed where it is determined that such detailed descriptions would unnecessarily obscure the essential points of the disclosed concept. The described progression of processing steps and / or operations is exemplary; however, the order of steps and / or operations is not limited to the order set forth herein and can be varied as is known in the art, except for steps and / or operations that must occur in a specific order. The same reference numerals always denote the same elements. The names of the various elements used in the following description may be chosen solely for ease of writing the specification and may therefore differ from those used in actual products.

[0038] The advantages and features of this disclosure, as well as methods for achieving these advantages and features, will become clear from the exemplary embodiments described in detail below with reference to the accompanying drawings. However, this 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 disclosure and scope of this disclosure.

[0039] The shapes, dimensions, ratios, angles, quantities, etc., shown in the accompanying drawings to describe exemplary embodiments of this disclosure are merely examples, and this disclosure is not limited thereto. Throughout the specification, the same reference numerals generally denote the same elements. Furthermore, in the following description of this disclosure, detailed explanations of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of this disclosure. Terms used herein, such as “comprising,” “having,” and “consisting of,” are generally intended to allow for the addition of additional components, unless these terms are used in conjunction with the term “only.” Unless otherwise expressly stated, any reference to the singular may include the plural.

[0040] Even without explicit explanation, components are interpreted as including the normal tolerance range.

[0041] Any implementation described in this article as an "example" is not necessarily to be interpreted as superior to or better than other implementations.

[0042] When using terms such as “above,” “over,” “below,” and “next” to describe the positional relationship between two parts, one or more parts may be located between the two parts, unless these terms are used with the terms “immediately” or “directly.”

[0043] When an element or layer is placed "on" another element or layer, the other layer or element can be directly inserted onto the other element or between the element or layer and other elements.

[0044] When describing temporal relationships, discontinuous cases may be included when the temporal order is described as such as "after", "following", "next", and "before", unless more restrictive terms such as "only", "immediately", or "directly" are used.

[0045] Although the terms "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components. Therefore, the first component mentioned below may be the second component in the technical concept of this disclosure.

[0046] Furthermore, when a component or layer is “connected,” “joined,” or “adhered” to another component or layer, this means that the component or layer can be directly connected or adhered to the other component or layer, or indirectly connected or adhered to the other component or layer, wherein one or more intermediate components or layers are “set” or “inserted” between these components or layers, unless otherwise specified. It should be understood that this means components can be configured to be in direct contact with each other, or they can be configured not to be in direct contact with each other.

[0047] The expressions "first element," "second element," and " / or" "third element" should be understood as one of the first element, the second element, and the third element, or any combination or all combinations of the first element, the second element, and the third element. For example, A, B, and / or C can refer to: only A; only B; only C; any combination or some combination of A, B, and C; or all of A, B, and C.

[0048] Throughout the specification, the same reference numerals generally denote the same elements.

[0049] For ease of description, the dimensions and thickness / coarseness of each component shown in the figures are illustrated, and this disclosure is not limited to the dimensions and thickness / coarseness of the components shown.

[0050] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments pertain. It should also be understood that terms such as those defined in common dictionaries shall be interpreted as having a meaning consistent, for example, with their meaning in the context of the relevant field, and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein. For example, as one of ordinary skill in the art will understand, the terms “component” or “unit” may, for example, apply to a single circuit or structure, an integrated circuit, a computational block of a circuit device, or any structure configured to perform the described functions.

[0051] Instead, these embodiments may be provided to make this disclosure thorough and complete enough to assist those skilled in the art in fully understanding its scope. Furthermore, this disclosure is limited only by the scope of the claims.

[0052] Features of the various embodiments of this disclosure may be partially or completely adhered to or combined with each other, and may be interlocked and operated in various technical ways, and these embodiments may be performed independently or in association with each other.

[0053] Exemplary embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0054] A stretchable display device refers to a display device that can display images even when bent or stretched. Stretchable display devices offer greater flexibility compared to conventional display devices. Therefore, the shape of a stretchable display device can be freely changed according to user manipulation to bend or stretch it. For example, when a user holds the end of the stretchable display device and pulls it, the device can extend under the user's force. Alternatively, when the user places the stretchable display device on an uneven wall surface, it can be configured to bend according to the shape of the wall surface. Furthermore, when the force applied by the user is removed, the stretchable display device can return to its original shape.

[0055] Figure 1 This is an exploded perspective view of a stretchable display device according to exemplary embodiments of the present disclosure.

[0056] Reference Figure 1 The stretchable display device 100 may include a lower substrate 110, a plurality of island substrates 111, connecting lines 180, a chip on film (COF) 130, a printed circuit board 140, an upper substrate 120, and a polarizing layer 125.

[0057] For ease of description, Figure 1 The lower adhesive layer used for attaching the lower substrate 110 and the upper substrate 120 is not shown in the diagram.

[0058] The lower substrate 110 is a substrate that supports and protects several components of the stretchable display device 100. As a flexible substrate, the lower substrate 110 can be made of a bendable or stretchable insulating material.

[0059] For example, the lower substrate 110 can be formed of silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE), and thus has flexible properties. However, the material of the lower substrate 110 is not limited to this.

[0060] The lower substrate 110 is a flexible substrate to allow for reversible expansion and contraction. Furthermore, the elastic modulus of the lower substrate can range from several megapascals (MPa) to several hundred megapascals, and the elongation at break can be 100% or higher. For example, the thickness of the lower substrate 110 can range from 10 μm to 1 mm, but is not limited thereto.

[0061] For example, the lower substrate 110 may have an active region AA and a non-active region NA surrounding the active region AA.

[0062] First, the active area AA is the area in the stretchable display device 100 where an image is displayed, and display elements and various driving elements for driving the display elements can be disposed in the active area AA. The active area AA may include multiple pixels, and the multiple pixels include multiple sub-pixels. The multiple pixels are disposed in the active area AA and may include multiple display elements. The multiple sub-pixels can be connected to various wiring lines respectively. For example, each of the multiple sub-pixels can be connected to various wiring lines such as gate lines, data lines, high-potential power lines, low-potential power lines, and reference voltage lines.

[0063] The non-active region NA is the region adjacent to the active region AA. The non-active region NA surrounds the active region AA. No image is displayed in the non-active region NA, but wiring lines and circuit units can be set there. For example, multiple pads are provided in the non-active region NA, and these pads can be individually connected to multiple sub-pixels of the active region AA.

[0064] Multiple island substrates 111 may be disposed on a lower substrate 110. The multiple island substrates 111 are rigid substrates and are spaced apart from each other to be disposed on the lower substrate 110. The multiple island substrates 111 may be more rigid than the lower substrate 110. That is, the lower substrate 110 may have relatively higher ductility than the multiple island substrates 111, and the multiple island substrates 111 may have relatively higher rigidity than the lower substrate 110.

[0065] The island substrate 111 is formed of a plastic material with high rigidity and flexibility, and may be formed, for example, of polyimide (PI), polyacrylate or polyacetate.

[0066] The modulus of the multiple island substrates 111 can be higher than that of the lower substrate 110. Modulus is an elastic modulus that represents the ratio of the amount of deformation of a substrate under applied stress to that stress. A relatively high modulus indicates relatively high hardness. Therefore, the multiple island substrates 111 can be multiple rigid substrates that are more rigid than the lower substrate 110. For example, the modulus of the multiple island substrates 111 can be 1000 times higher or 1000 times higher than that of the lower substrate 110, but is not limited to this.

[0067] Connector 180 can be disposed between multiple island substrates 111. For example, connector 180 is disposed between pads disposed above multiple island substrates 111 to electrically connect the pads to each other. Reference will be made below. Figure 2 A more detailed description of the 180 connecting cable.

[0068] COF 130 is a film on a malleable base film 131 on which various components, such as a driver IC 132, are disposed and to provide signals to multiple sub-pixels in the active region AA. COF 130 can be bonded to multiple pads disposed in the non-active region NA, and supply power voltage, data voltage, and gating voltage to the multiple sub-pixels in the active region AA through the pads. COF 130 includes a base film 131 and a driver IC 132. Furthermore, various components can be additionally disposed on COF 130.

[0069] The base film 131 is a layer that supports the driver IC 132 of the COF 130. The base film 131 can be formed of an insulating material, and for example, it can be formed of a flexible insulating material.

[0070] The driver IC 132 is a component that processes data for displaying images and drive signals for processing images.

[0071] exist Figure 1 Although the driver IC 132 is shown to be mounted using COF 130 technology, this disclosure is not limited thereto, and the driver IC 132 can be mounted using technologies such as chip-on-glass (COG) or tape-on-carrier (TCP).

[0072] Control units, such as IC chips or circuit units, can be mounted on the printed circuit board 140. Furthermore, a memory or processor can be mounted on the printed circuit board 140. The printed circuit board 140 is a component that transmits signals used to drive the display element from the control unit to the display element.

[0073] Printed circuit board 140 is connected to COF 130 to be electrically connected to each of the multiple sub-pixels of multiple island substrates 111.

[0074] The upper substrate 120 overlaps with the lower substrate 110 to protect various components of the stretchable display device 100. The upper substrate 120, as a flexible substrate, can be made of a bendable or stretchable insulating material. For example, the upper substrate 120 can be formed of a flexible material and can be formed of the same material as the lower substrate 110, but is not limited thereto.

[0075] Furthermore, the polarizing layer 125 is configured to suppress external light reflection from the stretchable display device 100 and overlaps with the upper substrate 120 to be disposed on the upper substrate 120. However, the polarizing layer 125 is not limited to this, and may be disposed below the upper substrate 120 or omitted depending on the configuration of the stretchable display device 100.

[0076] In the following text, reference will be made to Figures 2 to 6 A stretchable display device 100 according to exemplary embodiments of the present disclosure will be described in more detail.

[0077] Figure 2 This is an enlarged plan view of a stretchable display device according to a first exemplary embodiment of the present disclosure.

[0078] Figure 3 It is along Figure 2 A cross-sectional view taken from line A-A'.

[0079] Figure 4 yes Figure 3 A plan view of the viewing panel of a stretchable display device.

[0080] Figure 5 yes Figure 3 A cross-sectional view of the stretchable display device after it has been stretched.

[0081] Figure 6 yes Figure 4 The view panel is a flat view after being stretched.

[0082] Figures 2 to 6 The stretchable display device of the first exemplary embodiment of this disclosure is illustrated by taking stretching in the horizontal direction (i.e., the X-axis direction) as an example. In this case, the structure can be arranged in a direction substantially perpendicular to the stretching direction (i.e., the Y-axis direction).

[0083] Figure 4 It corresponds to Figure 3 A schematic plan view of the viewing angle panel of a subpixel in a stretchable display device.

[0084] Figure 5 and Figure 6 These are cross-sectional views and plan views of the viewing panel of a stretchable display device after it has been stretched in the horizontal direction (i.e., the X-axis direction).

[0085] For ease of description, references will also be made. Figure 1 Describe it.

[0086] refer to Figures 2 to 6 Multiple island-shaped substrates 111 can be disposed on the lower substrate 110. The multiple island-shaped substrates 111 are spaced apart from each other to be disposed on the lower substrate 110. For example, as... Figure 1 and Figure 2 As shown, multiple island substrates 111 can be arranged in a matrix on the lower substrate 110, but are not limited thereto.

[0087] For example, the lower substrate 110 may have an active region AA and a non-active region NA surrounding the active region AA.

[0088] For example, the active area AA includes multiple pixels PX, each pixel PX includes multiple sub-pixels SPX, and a sub-pixel SPX may include the display element area DA, the first wiring area WA1, the second wiring area WA2, and the transparent area TA.

[0089] In the display element area DA, display elements and various driving elements used to drive the display elements can be set.

[0090] For example, the display element may be a miniature LED 160, but is not limited thereto, and the display element may be an organic light-emitting diode or a liquid crystal display element including an anode, an organic light-emitting layer and a cathode.

[0091] For example, the driving element may be transistor 150, but this disclosure is not limited thereto.

[0092] At this time, the first wiring area WA1 is set on one side of the display element area DA, and can be set between adjacent display element areas DA in the X-axis direction.

[0093] For example, the first connecting line 181 can be provided in the first wiring area WA1. The first connecting line 181 refers to the wiring line in the connecting line 180 that extends in the X-axis direction.

[0094] The first connection line 181 can connect to pads on two island substrates 111 that are arranged in parallel / parallel directions among the pads on top of a plurality of adjacent island substrates 111 in the X-axis direction. The first connection line 181 can be used as a gate line or a low-potential power line, but is not limited thereto.

[0095] In addition, the second wiring area WA2 is located on the other side of the display element area DA, and is located between adjacent display element areas DA in the Y-axis direction.

[0096] For example, the second connecting line 182 can be provided in the second wiring area WA2. The second connecting line 182 refers to the wiring line in the connecting line 180 that extends in the Y-axis direction.

[0097] The second connection line 182 can connect to pads on two parallel / parallel island substrates 111 among pads on top of multiple adjacent island substrates 111 in the Y-axis direction. The second connection line 182 can serve as a data line, a high-potential power line, or a reference voltage line, but is not limited thereto.

[0098] Furthermore, the transparent area TA can be set between adjacent first wiring areas WA1 in the Y-axis direction and between adjacent second wiring areas WA2 in the X-axis direction. Meanwhile, areas other than those in the first wiring areas WA1 and the second wiring areas WA2 where the first connecting line 181 and the second connecting line 182 are provided are also considered transparent areas because no opaque components are provided in these areas.

[0099] In the transparent area TA, no opaque components are provided, and a lower substrate 110 formed of an elastomer is provided, so that the transparent area can be semi-transparent.

[0100] Multiple island-shaped substrates 111 can be arranged in the display element area DA.

[0101] The buffer layer 112 can be disposed on a plurality of island substrates 111. For example, the buffer layer 112 can be formed on a plurality of island substrates 111 to protect various components of the stretchable display device 100 from the penetration of moisture H2O and oxygen O2 from the outside of the lower substrate 110 and the plurality of island substrates 111.

[0102] In this case, the buffer layer 112 can be made of an insulating material, such as a single or double inorganic layer formed of silicon nitride (SiNx), silicon oxide (SiOx), and silicon oxynitride (SiON). However, depending on the structure or characteristics of the stretchable display device 100, the buffer layer 112 can be omitted.

[0103] The buffer layer 112 may be formed only in the region overlapping with the plurality of island substrates 111. As described above, the buffer layer 112 may be formed of an inorganic material, and therefore the buffer layer may be easily broken or damaged during the stretching of the stretchable display device 100. Therefore, the buffer layer 112 is not disposed in the region between the plurality of island substrates 111, but is patterned to have the shape of the plurality of island substrates 111 so that it is formed only on the plurality of island substrates 111. Therefore, in the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, the buffer layer 112 is disposed only in the region overlapping with the plurality of island substrates 111, which are rigid substrates. Therefore, even if the stretchable display device 100 is bent or stretched and deformed, damage to the buffer layer 112 can be suppressed.

[0104] Gate pad 171 may be disposed on buffer layer 112, but is not limited thereto. Gate pad 171 is a pad that transmits a gating signal to multiple sub-pixels SPX. Gate pad 171 may be formed of the same material as gating electrode 151, but is not limited thereto.

[0105] A transistor 150, including a gate electrode 151, an active layer 152, a source electrode 153, and a drain electrode 154, can be formed above the buffer layer 112.

[0106] Transistor 150 can be placed in the display element area DA.

[0107] For example, the active layer 152 is disposed on the buffer layer 112, and the gate insulating layer 113 may be disposed on the active layer 152 to insulate the active layer 152 and the gate electrode 151 from each other.

[0108] The common line CL can be disposed on the gate insulating layer 113.

[0109] The common line CL is a wiring line that applies a common voltage to multiple sub-pixels SPX. The common line CL can be formed of the same material as the source electrode 153 and drain electrode 154 of transistor 150, but is not limited to this.

[0110] Furthermore, an interlayer insulating layer 114 may be disposed on the gate insulating layer 113 to insulate the gate electrode 151 and the source electrode 153 from the drain electrode 154. Additionally, the source electrode 153 and the drain electrode 154, which are in contact with the active layer 152, may be disposed on the interlayer insulating layer 114.

[0111] The gate insulating layer 113 and the interlayer insulating layer 114 are patterned to be disposed only in the regions overlapping with the plurality of island substrates 111. Similar to the buffer layer 112, the gate insulating layer 113 and the interlayer insulating layer 114 are also formed of inorganic materials, making them prone to breakage and damage during the stretching of the stretchable display device 100. Therefore, the gate insulating layer 113 and the interlayer insulating layer 114 are not disposed in the regions between the plurality of island substrates 111, but are patterned to have the shape of the plurality of island substrates 111, so that they are disposed only above the plurality of island substrates 111.

[0112] exist Figure 3 The various transistors that may be included in the stretchable display device 100 are not limited to driving transistors, although only driving transistors are shown for ease of description. Switching transistors or capacitors may also be included in the display device. Furthermore, although transistor 150 is described as having a coplanar structure in this specification, various transistors such as interleaved structures may also be used.

[0113] In addition, the reflective layer 183 can be disposed on the interlayer insulating layer 114.

[0114] The reflective layer 183 is a layer that reflects light emitted from the LED 160 and directed to the lower substrate 110 onto the upper part of the stretchable display device 100 to output the light to the outside. The reflective layer 183 may be formed of a metallic material with high reflectivity.

[0115] The adhesive layer 119 can be disposed on the reflective layer 183 to cover the reflective layer 183.

[0116] The adhesive layer 119 is used to bond the LED 160 to the reflective layer 183, and also to insulate the reflective layer 183, which is formed of a metallic material, from the LED 160. For example, the adhesive layer 119 may be formed of a thermosetting or photocurable material, but is not limited to these. Figure 3 Although it is shown that the adhesive layer 119 is configured to cover only the reflective layer 183, the placement of the adhesive layer 119 is not limited to this.

[0117] LED 160 can be disposed above adhesive layer 119. LED 160 can be disposed overlapping with reflective layer 183.

[0118] LED 160 can be set in the display element area DA.

[0119] LED 160 may include an n-type layer 161, an active layer 162, a p-type layer 163, an n-electrode 165, and a p-electrode 164. The following description uses a horizontal LED 160 as an example of LED 160, but it is not limited to this.

[0120] For example, the n-type layer 161 of the LED 160 can be disposed on the adhesive layer 119 to overlap with the reflective layer 183. The n-type layer 161 can be formed by implanting an n-type impurity into gallium nitride, which has excellent crystallinity. The active layer 162 can be disposed on the n-type layer 161. The active layer 162 is the light-emitting layer in the LED 160 that emits light, and can be formed of a nitride semiconductor (e.g., indium gallium nitride). The p-type layer 163 can be disposed on the active layer 162. The p-type layer 163 can be formed by implanting a p-type impurity into gallium nitride. However, the constituent materials of the n-type layer 161, the active layer 162, and the p-type layer 163 are not limited thereto.

[0121] The p-electrode 164 can be disposed on the p-type layer 163 of the LED 160. The n-electrode 165 can be disposed on the n-type layer 161 of the LED 160. The n-electrode 165 can be spaced apart from the p-electrode 164. For example, the LED 160 is manufactured by sequentially stacking the n-type layer 161, the active layer 162, and the p-type layer 163, etching predetermined portions of the active layer 162 and the p-type layer 163, and forming the n-electrode 165 and the p-electrode 164. In this case, a predetermined portion serving as a space for separating the n-electrode 165 and the p-electrode 164 from each other can be etched to expose a portion of the n-type layer 161. That is, the surface of the LED 160 on which the n-electrode 165 and the p-electrode 164 are disposed is not a flat surface and has different heights. Therefore, the p-electrode 164 is disposed on the p-type layer 163 and the n-electrode 165 is disposed on the n-type layer 161, and the p-electrode 164 and the n-electrode 165 can be disposed at different levels and spaced apart from each other.

[0122] Furthermore, the n-electrode 165 can be positioned closer to the reflective layer 183 than the p-electrode 164. Additionally, both the n-electrode 165 and the p-electrode 164 can be formed of a conductive material, and for example, of a transparent conductive oxide. Furthermore, the n-electrode 165 and the p-electrode 164 can be formed of the same material, but are not limited to this.

[0123] The planarization layer 115 can be disposed above the interlayer insulation layer 114 and the adhesive layer 119.

[0124] The planarization layer 115 planarizes the upper surface of the transistor 150. While planarizing the upper surface of the planarization layer 115, the planarization layer 115 can be disposed in an area excluding the area where the LED 160 is disposed. The planarization layer 115 can consist of two or more layers.

[0125] In some exemplary embodiments, an additional insulating layer may be formed between the transistor 150 and the planarization layer 115. That is, an additional insulating layer covering the transistor 150 may be provided to protect the transistor 150 from the penetration of moisture and oxygen. The additional insulating layer may be formed of an inorganic material and may be formed of a single layer or a double layer, and the additional insulating layer may be a passivation layer, but this disclosure is not limited thereto.

[0126] The first electrode 166 and the second electrode 167 can be disposed on the planarization layer 115. The first electrode 166 is the electrode that electrically connects the transistor 150 and the LED 160.

[0127] The first electrode 166 can be connected to the p electrode 164 of the LED 160 through contact holes formed in the planarization layer 115. Furthermore, the first electrode 166 can be connected to the drain electrode 154 of the transistor 150 through contact holes formed in the planarization layer 115 and the interlayer insulating layer 114. However, the first electrode 166 is not limited to this, and can be connected to the source electrode 153 of the transistor 150 depending on the type of the transistor 150. The p electrode 164 of the LED 160 and the drain electrode 154 of the transistor 150 can be electrically connected to each other through the first electrode 166.

[0128] Furthermore, the second electrode 167 is an electrode that electrically connects the LED 160 and the common line CL. For example, the second electrode 167 is connected to the common line CL through contact holes formed in the planarization layer 115 and the interlayer insulating layer 114, and can also be connected to the n electrode 165 of the LED 160 through contact holes formed in the planarization layer 115. Therefore, the n electrode 165 of the LED 160 and the common line CL can be electrically connected.

[0129] When the stretchable display device 100 is turned on, different voltage levels can be applied to the drain electrode 154 and common line CL of transistor 150. The voltage applied to the drain electrode 154 of transistor 150 is applied to the first electrode 166, and the common voltage can be applied to the second electrode 167. Different voltage levels can be applied to the p electrode 164 and n electrode 165 through the first electrode 166 and the second electrode 167, causing LED 160 to emit light.

[0130] exist Figure 3 In the illustration, transistor 150 is shown to be electrically connected to p-electrode 164 and common line CL is shown to be electrically connected to n-electrode 165, but this disclosure is not limited thereto. Therefore, transistor 150 is electrically connected to n-electrode 165, and common line CL may be electrically connected to p-electrode 164.

[0131] Data pads 173 and connection pads 172 can be positioned above the planarization layer 115.

[0132] Data pad 173 can transmit data signals from connection line 180, which serves as a data line, to multiple sub-pixels SPX. Data pad 173 can be connected to the source electrode 153 of transistor 150 through contact holes formed in planarization layer 115.

[0133] Furthermore, the connection pad 172 transmits the gating signal from the connection line 180, which serves as the gating line, to multiple sub-pixels (SPX). The connection pad 172 is connected to the gate pad 171 through contact holes formed in the planarization layer 115 and the interlayer insulating layer 114, and can transmit the gating signal to the gate pad 171. The connection pad 172 may be formed of the same material as the data pad 173, but is not limited thereto.

[0134] A dam 116 may be disposed on the planarization layer 115, the first electrode 166, and the second electrode 167. The dam 116 is configured to overlap with the end of the reflective layer 183, and the portion of the reflective layer 183 that does not overlap with the dam 116 can be defined as a light-emitting region. The dam 116 may be formed of an organic insulating material and may be formed of the same material as the planarization layer 115. Furthermore, the dam 116 may be configured to include a black material to suppress color mixing caused by light emitted from the light-emitting diode LED 160 transmitting to adjacent sub-pixels SPX. For example, the dam 116 may be formed of polyimide, acrylic resin, or benzocyclobutene (BCB)-based resin, but is not limited thereto.

[0135] The stretchable display device 100 according to the first exemplary embodiment of this disclosure may include an LED 160. Since the LED 160 is formed of inorganic materials instead of organic materials, it exhibits excellent reliability, resulting in a lifespan longer than that of liquid crystal display elements or organic light-emitting diodes (OLEDs). Furthermore, the LED 160 has a fast light emission speed, low power consumption, and excellent stability due to high shock resistance, and possesses excellent luminous efficiency for displaying high-brightness images, making it suitable for very large screens. Specifically, the LED 160 is formed of inorganic materials instead of organic materials, eliminating the need for the encapsulation layer required when using organic light-emitting diodes. Therefore, the encapsulation layer, which is prone to breakage or damage during the stretching of the stretchable display device 100, can be omitted. Thus, in the stretchable display device 100 according to the first exemplary embodiment of this disclosure, the LED 160 serves as a display element, eliminating the need for the encapsulation layer, which is prone to damage when the stretchable display device 100 is bent or stretched. Furthermore, the LED 160 is formed of inorganic materials rather than organic materials, which allows the display elements of the stretchable display device 100 according to the first exemplary embodiment of the present disclosure to be protected from moisture or oxygen and to have excellent reliability.

[0136] The stretchable display device 100 of the first exemplary embodiment of this disclosure has a structure in which a plurality of island-shaped substrates 111 having relative rigidity are spaced apart from each other to be disposed on a lower substrate 110 having relative ductility. Therefore, in the stretchable display device 100 according to the first exemplary embodiment of this disclosure, the stretchable display device 100 is more easily deformed when a user stretches or bends it. Furthermore, when the stretchable display device 100 deforms, damage to the components of the stretchable display device 100 due to deformation can be minimized or reduced.

[0137] Connector 180 refers to wiring lines that electrically connect pads above a plurality of island substrates 111. Connector 180 may include a first connector 181 and a second connector 182. The first connector 181 refers to the wiring line in connector 180 that extends in the X-axis direction, and the second connector 182 refers to the wiring line in connector 180 that extends in the Y-axis direction.

[0138] In typical stretchable display devices, various wiring lines, such as multiple gate lines and multiple data lines, extend between multiple sub-pixels, and multiple sub-pixels are connected to a single signal line. Therefore, in typical stretchable display devices, various wiring lines, such as gate lines, data lines, high-potential power lines, and reference voltage lines, extend from one side of the stretchable display device to the other without being interrupted on the substrate.

[0139] In contrast, in the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, various wiring lines (such as gate lines, data lines, high-potential power lines, and reference voltage lines) formed of a metallic material can be provided only above the plurality of island substrates 111. That is, in the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, the various wiring lines formed of a metallic material are provided only above the plurality of island substrates 111, but may not contact the lower substrate 110. Therefore, various wiring lines can be patterned to correspond to the plurality of island substrates 111 in a discontinuous manner.

[0140] In the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, in order to connect discontinuous wiring lines, the pads above two adjacent island substrates 111 can be connected by a connecting line 180. That is, the connecting line 180 can electrically connect the pads above two adjacent island substrates 111. Therefore, the stretchable display device 100 of the present disclosure can include multiple connecting lines 180 to electrically connect various wiring lines such as gate lines, data lines, high-potential power lines, and reference voltage lines between multiple island substrates 111. For example, a gate line can be provided above multiple island substrates 111 that are adjacent to each other along the X-axis direction, and a gate pad 171 can be provided at both ends of the gate line. In this case, multiple gate pads 171 above multiple island substrates 111 that are adjacent in the X-axis direction can be connected to each other by the connecting line 180, which serves as a gate line. Therefore, the gate line provided above multiple island substrates 111 and the connecting line 180 provided above the lower substrate 110 can serve as a single gate line. In other words, all the various wiring lines (such as data lines, high-potential power lines and reference voltage lines) that can be included in the stretchable display device 100 can also be used as a wiring line through the connection line 180 as described above.

[0141] The first connection line 181 can connect pads on two parallel / parallel island substrates 111 among the pads on top of a plurality of adjacent island substrates 111 in the X-axis direction. The first connection line 181 can serve as a gate line or a low-potential power line, but is not limited thereto. For example, the first connection line 181 can be used as a gate line and electrically connect gate pads 171 on two parallel / parallel island substrates 111 in the X-axis direction through contact holes formed in the dam 116. Therefore, as described above, the gate pads 171 on top of a plurality of island substrates 111 arranged in the X-axis direction can be connected by the first connection line 181 as a gate line and a gate signal can be transmitted.

[0142] The first connecting line 181 can be set in the first wiring area WA1.

[0143] The second connection line 182 can connect pads on two parallel / parallel island substrates 111 among the pads on top of a plurality of adjacent island substrates 111 in the Y-axis direction. The second connection line 182 can serve as a data line, a high-potential power line, or a reference voltage line, but is not limited thereto. For example, the second connection line 182 can be used as a data line, and data pads 173 on two parallel / parallel island substrates 111 in the Y-axis direction can be electrically connected via contact holes formed in the dam 116. Therefore, as described above, the data pads 173 on top of a plurality of island substrates 111 arranged in the Y-axis direction can be connected and transmit a data signal via multiple second connection lines 182 used as data lines.

[0144] The second connecting line 182 can be set in the second wiring area WA2.

[0145] Connector 180 may include a base polymer and conductive particles. For example, first connector 181 may include a base polymer and conductive particles, and second connector 182 may include a base polymer and conductive particles.

[0146] The first connection line 181 can be formed to extend to the top surface of the lower substrate 110, and simultaneously contact the top and side surfaces of the embankment 116 disposed above the island substrate 111, as well as the planarization layer 115, the interlayer insulating layer 114, the buffer layer 112, and the side surfaces of the plurality of island substrates 111. Therefore, the first connection line 181 contacts the top surface of the lower substrate 110, contacts the side surfaces of adjacent island substrates 111, and can also contact the side surfaces of the buffer layer 112, the gate insulating layer 113, the interlayer insulating layer 114, the planarization layer 115, and the embankment 116 disposed above adjacent island substrates 111. Furthermore, the first connection line 181 can contact the connection pads 172 disposed in adjacent island substrates 111, but is not limited thereto.

[0147] At this time, similar to the lower substrate 110, the base polymer of the first connecting line 181 can be made of a flexible or stretchable insulating material. The base polymer may include, for example, styrene-butadiene styrene (SBS), but is not limited thereto. Therefore, the base polymer will not be damaged when the stretchable display device 100 is bent or stretched. The base polymer can be formed by coating the upper part of the lower substrate 110 or the island substrate 111 with the material constituting the base polymer, or by applying the material constituting the base polymer using a slit.

[0148] The conductive particles of the first connecting line 181 can be dispersed in the base polymer. In this case, the first connecting line 181 may include conductive particles dispersed in the base polymer at a predetermined concentration. The first connecting line 181 can be formed by uniformly stirring the conductive particles in the base polymer, and then coating and curing the base polymer with the dispersed conductive particles onto the lower substrate 110 and the island substrate 111, but is not limited thereto. The conductive particles may include at least one of silver (Ag), gold (Au), and carbon, but are not limited thereto.

[0149] Conductive particles dispersed in the base polymer of the first connection line 181 can form a conductive path that electrically connects the connection pads 172 disposed on adjacent island substrates 111. Furthermore, the conductive particles can form a conductive path by electrically connecting the gate pads 171 disposed on the outermost island substrate 111 and the pads disposed in the non-active region NA.

[0150] The base polymer of the first interconnect 181 and the conductive particles dispersed in the base polymer can be linearly connected to pads disposed on adjacent island substrates 111. Therefore, during the manufacturing process, the base polymer can be formed into a linear shape connecting pads disposed on multiple island substrates 111. Thus, the conductive path formed by the conductive particles dispersed in the base polymer can also have a linear shape. However, the process and shape of forming the base polymer and conductive particles of the first interconnect 181 are not limited thereto.

[0151] The second connection line 182 can be formed to extend to the top surface of the lower substrate 110, and simultaneously contact the top and side surfaces of the embankment 116 disposed above the island substrate 111, as well as the planarization layer 115, the interlayer insulating layer 114, the buffer layer 112, and the side surfaces of the plurality of island substrates 111. Therefore, the second connection line 182 contacts the top surface of the lower substrate 110, contacts the side surfaces of the adjacent island substrate 111, and contacts the side surfaces of the buffer layer 112, the gate insulating layer 113, the interlayer insulating layer 114, the planarization layer 115, and the embankment 116 disposed above the adjacent island substrate 111. Furthermore, the second connection line 182 can contact the data pads 173 disposed in the adjacent island substrate 111, but is not limited thereto.

[0152] Furthermore, similar to the lower substrate 110, the base polymer of the second connecting line 182 can be made of a flexible or stretchable insulating material, and can be the same material as the base polymer of the first connecting line 181. The base polymer can include, for example, SBS, but is not limited thereto.

[0153] Furthermore, the conductive particles of the second connecting line 182 can be dispersed in the base polymer. For example, the second connecting line 182 may include conductive particles dispersed in the base polymer at a predetermined concentration. The concentration of conductive particles dispersed in the upper part of the base polymer of the second connecting line 182 can be substantially the same as the concentration of conductive particles dispersed in the lower part of the base polymer. Furthermore, the manufacturing process of the second connecting line 182 can be the same as the manufacturing process of the first connecting line 181, and the manufacturing processes can be performed simultaneously.

[0154] Conductive particles dispersed in the base polymer of the second connection line 182 can form a conductive path that electrically connects data pads 173 disposed on adjacent island substrates 111. Furthermore, data pads 173 disposed on the outermost island substrate 111 and pads disposed in the non-active region NA are electrically connected to form a conductive path.

[0155] The base polymer of the second interconnect 182 and the conductive particles dispersed in the base polymer can be linearly connected to pads disposed on adjacent island substrates 111. Therefore, during the manufacturing process, the base polymer can be formed into a linear shape connecting pads disposed on multiple island substrates 111. Consequently, the conductive path formed by the conductive particles dispersed in the base polymer can also have a linear shape. However, the process for forming the base polymer and conductive particles of the second interconnect 182, and their shapes, are not limited to this.

[0156] In some exemplary embodiments, the conductive particles dispersed in the base polymer of the connecting line 180 may be configured to be dispersed in the base polymer in a concentration gradient.

[0157] For example, the concentration of conductive particles decreases from the top to the bottom of the base polymer, thus the conductivity of the conductive particles can be maximized in the top part of the base polymer. Specifically, in this case, an ink printing process can be used to inject the conductive particles into the base polymer, which uses conductive precursors dispersed on the top surface of the base polymer.

[0158] Simultaneously, during the injection of conductive particles into the base polymer, the polymer expands multiple times, allowing the conductive particles to penetrate into the empty spaces of the base polymer. As described above, when the base polymer containing the injected conductive particles is immersed in a reducing agent or reduced using steam, a connecting line 180 can be formed.

[0159] Therefore, in the permeation region above the base polymer, the concentration of conductive particles can be high enough to form a conductive path.

[0160] The thickness of the penetration region, in which conductive particles are dispersed at a high concentration in the upper part of the base polymer, can vary depending on the time and intensity at which the conductive particles are injected onto the top surface of the base polymer. For example, the longer or more intense the conductive particles are injected onto the top surface of the base polymer, the greater the thickness of the penetration region. Furthermore, the conductive particles can come into contact with each other on the upper part of the base polymer, thereby forming conductive paths through the contacting particles to transmit electrical signals.

[0161] Furthermore, in some exemplary embodiments, the base polymer of the connecting line 180 can be formed as a monolayer between adjacent island substrates 111 above the lower substrate 110. Specifically, with Figure 2 As shown, the base polymer can be configured as a single layer to contact the lower substrate 110 in the region between the closest adjacent island substrates 111 in the X-axis direction. The base polymer can be formed to overlap with all the plurality of pads formed parallel / in parallel to each other on an upper surface of one island substrate 111. Furthermore, conductive particles can be formed individually to correspond to the plurality of pads, while simultaneously forming multiple conductive paths on the base polymer layer. Therefore, the conductive paths formed by the conductive particles can linearly connect the pads disposed on adjacent island substrates 111. For example, conductive particles can be injected onto the top surface of the base polymer layer disposed between the plurality of island substrates 111 to form four conductive paths.

[0162] In some exemplary embodiments, the base polymer of the interconnect 180 can be disposed over the entire area except for the region where the plurality of island substrates 111 are disposed. The base polymer can be configured as a single layer to contact the lower substrate 110 in areas of the lower substrate 110 excluding areas overlapping with the plurality of rigid substrates (i.e., the plurality of island substrates 111). Therefore, the area of ​​the lower substrate 110 excluding the areas overlapping with the plurality of island substrates 111 can be covered by the base polymer. The base polymer can contact the pads of the plurality of island substrates 111 such that a portion of the base polymer can be configured to cover the edges of the plurality of island substrates 111. Furthermore, conductive particles can form conductive paths on the base polymer connecting the pads on the plurality of island substrates 111 that are adjacent to each other.

[0163] When the base polymer is disposed as a single layer over the entire area of ​​the lower substrate 110 except for the area where multiple island substrates 111 are disposed above the lower substrate 110, the base polymer can be formed to be applied to the entire area of ​​the lower substrate 110 except for the area where multiple island substrates 111 are disposed. Therefore, a separate process for patterning the base polymer may not be required. Thus, the manufacturing process of the base polymer and the interconnects can be simplified, and process costs and time can be reduced.

[0164] Because the base polymer is disposed as a single layer over the entire region except for the area where a plurality of island substrates 111 are disposed above the lower substrate 110, the force applied when the stretchable display device 100 is bent or stretched can be dispersed. Furthermore, in some exemplary embodiments, the top surface of the base polymer of the connecting lines 180 may be flat.

[0165] For example, with Figure 3 As shown, the top surface of the base polymer of the connecting lines 180 (such as gate lines and data lines) can be higher than the top surface of the planarization layer 115 above the plurality of island substrates 111. The top surface of the base polymer can be higher than the top surface of the embankment 116 above the plurality of island substrates 111. Therefore, in the base polymer of the connecting lines 180, the height of the top surface of the portion overlapping with the plurality of island substrates 111 can be equal to the height of the top surface of the region disposed between the plurality of island substrates 111. Therefore, the top surface of the connecting lines 180 can be flat. Therefore, in the cross-sectional view, the top surface of the conductive particles dispersed above the base polymer can have a linear shape without curvature.

[0166] Because of the various components above the multiple island substrates 111 spaced apart on the lower substrate 110, a step may exist between the upper surface of the embankment 116 and the upper surface of the lower substrate 110. In this case, the base polymer may be cut off due to the step on the top surface of the base polymer, thereby blocking the electrical path between the pads provided in the adjacent island substrates 111, which may increase the defect rate of the stretchable display device.

[0167] In this configuration, when the upper surface of the base polymer is flat, the step between the top surface of the elements disposed on the multiple island substrates 111 and the top surface of the lower substrate 110 where the multiple island substrates 111 are not disposed can be eliminated. Therefore, even if the stretchable display device 100 is bent or stretched, the connecting wires 180, including the base polymer and conductive particles, can be prevented from being cut due to this step. Furthermore, the flattened top surface of the base polymer minimizes or reduces damage to the connecting wires 180 during the manufacturing process of the stretchable display device 100.

[0168] The upper substrate 120, the polarizing layer 125, and the upper adhesive layer 118 can be disposed above the lower substrate 110 configured as described above.

[0169] The upper substrate 120 is a substrate that supports various components disposed below it. The upper substrate 120, being a flexible substrate, can be made of a bendable or stretchable insulating material. The upper substrate 120 is flexible to allow for reversible expansion and contraction. Furthermore, the elastic modulus can range from several MPa to several hundred MPa, and the elongation at break can be 100% or higher.

[0170] The thickness of the upper substrate 120 can be from 10 μm to 1 mm, but is not limited to this.

[0171] For example, the upper substrate 120 may be formed of the same material as the lower substrate 110, and may be formed of, for example, silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE), and thus have flexible properties. However, the material of the upper substrate 120 is not limited to this.

[0172] The upper substrate 120 can be formed as a film. Pressure is applied from the upper or lower portion to the upper substrate 120 and the lower substrate 110, such that the upper substrate 120 and the lower substrate 110 can be bonded by an upper adhesive layer 118 disposed below the upper substrate 120. However, this disclosure is not limited thereto, and in some exemplary embodiments, the upper adhesive layer 118 may be omitted. Furthermore, the upper substrate 120 can be formed by a coating method instead of a film, and in this case, the upper adhesive layer 118 may be omitted.

[0173] A polarizing layer 125 can be disposed on the upper substrate 120. In this case, the polarizing layer 125 polarizes light incident from the outside of the stretchable display device 100. Polarized light passing through the polarizing layer 125 and incident into the stretchable display device 100 can be reflected within the stretchable display device 100, causing a phase shift. Light with a shifted phase can then bypass the polarizing layer 125. Therefore, light incident from the outside of the stretchable display device 100 into the stretchable display device 100 is not released to the outside of the stretchable display device 100, thereby reducing external light reflection from the stretchable display device 100.

[0174] As mentioned above, stretchable display devices need to be easily bent or stretched, resulting in a low modulus. Therefore, a substrate with high ductility can be used for stretchable display devices. In this case, the substrate can be made of a flexible material with a low modulus, such as polydimethylsiloxane (PDMS). When this material is used as the lower substrate on which display elements are deposited during manufacturing, the low modulus material is susceptible to heat, which may damage the substrate due to the high temperatures (e.g., 100°C or higher) generated during the process of forming transistors or display elements.

[0175] Therefore, damage to the substrate during the formation of the display element can be suppressed by forming the display element on top of a substrate made of a high-temperature resistant material. Thus, attempts are made to use materials capable of withstanding the high temperatures generated during the manufacturing process (such as polyimide (PI)) to form the substrate. However, because high-temperature resistant materials have a high modulus, there is a problem that the material lacks ductility, resulting in the substrate hardly bending or stretching during the stretchable display device process.

[0176] Therefore, in the stretchable display device 100 according to the first exemplary embodiment of this disclosure, the plurality of island substrates 111, which are rigid substrates, are only provided in the areas where transistors 150 or LEDs 160 are provided. Therefore, damage to the plurality of island substrates 111 due to high temperatures during the manufacture of transistors 150 or LEDs 160 can be avoided.

[0177] Furthermore, in the stretchable display device 100 according to the first exemplary embodiment of this disclosure, the lower substrate 110 and the upper substrate 120, which are flexible substrates, can be disposed below and above the plurality of island substrates 111, respectively. Therefore, the remaining areas of the lower substrate 110 and the upper substrate 120, except for the areas overlapping with the plurality of island substrates 111, can be easily stretched and bent, thereby realizing the stretchable display device 100. Furthermore, damage to the transistors 150 and organic light-emitting diodes 160 disposed above the plurality of island substrates 111, which are rigid substrates, can be prevented when the stretchable display device 100 is bent or stretched.

[0178] Meanwhile, when the stretchable display device is bent or stretched, the lower substrate formed by the flexible substrate deforms, but the island substrate formed by the rigid substrate on which organic light-emitting diodes are disposed does not deform. In this case, if the wiring lines connecting the pads disposed on the multiple island substrates are not formed by a material that is easy to bend or stretch, the wiring lines may be easily broken and damaged due to the deformation of the lower substrate.

[0179] Conversely, in the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, the pads disposed in the plurality of island substrates 111 can be electrically connected by connecting lines 180 comprising a base polymer and conductive particles. The base polymer has ductility that allows the base polymer to be easily deformed. Therefore, even if the stretchable display device 100 according to the first exemplary embodiment of the present disclosure is bent or stretched, the region of the connecting lines 180 comprising the base polymer between the plurality of island substrates 111 can be easily deformed.

[0180] Furthermore, in the stretchable display device 100 according to the first exemplary embodiment of this disclosure, the connecting lines 180 include conductive particles, so that even if the base polymer is deformed, damage such as cracking will not occur in the conductive path formed by the conductive particles. For example, when the stretchable display device 100 is bent or stretched, the lower substrate 110, which is a flexible substrate, can deform in the area other than the area where the plurality of island substrates 111, which are rigid substrates, are disposed. In this case, the distance between the plurality of conductive particles disposed above the deformed lower substrate 110 can be changed. In this case, the concentration of the plurality of conductive particles disposed above the base polymer to form a conductive path can be kept high, so that electrical signals can be transmitted even if the distance between the plurality of conductive particles increases. Therefore, even if the base polymer is bent or stretched, electrical signals can be transmitted smoothly in the conductive path formed by the plurality of conductive particles. Furthermore, even if the stretchable display device 100 is bent or stretched and deformed, electrical signals can be transmitted between the pads.

[0181] In the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, the connecting lines 180 include a base polymer and conductive particles. Therefore, the connecting lines 180 connecting pads disposed on a plurality of adjacent island substrates 111 can be formed to have the shortest distance, i.e., to have a linear shape. That is, the stretchable display device 100 can be realized even if the connecting lines 180 are not formed to have a curved shape. The conductive particles of the connecting lines 180 are dispersed in the base polymer to form conductive paths. Furthermore, when the stretchable display device 100 is bent or stretched and deformed, the conductive paths formed by the conductive particles can be bent or stretched. In this case, only the distance between the conductive particles changes, but the conductive paths formed by the conductive particles can still transmit electrical signals. Therefore, in the stretchable display device 100 according to the first exemplary embodiment of the present disclosure, the space occupied by the connecting lines 180 can be minimized or reduced.

[0182] Typically, in stretchable displays, when a user stretches or bends the display, causing it to stretch, the distance between pixels increases, resulting in a decrease in the number of pixels per unit area. Therefore, the resolution decreases and the image may become distorted.

[0183] Furthermore, the lower or upper substrate is a flexible substrate to be bent or stretched, but the tensile strength is limited, which means that if the stretchable display device is stretched beyond the tensile strength, there is a possibility that the flexible substrate and display elements will be damaged.

[0184] Therefore, in the stretchable display device 100 according to the first exemplary embodiment of this disclosure, a flexible viewing angle panel WP having a structure 190 that deforms upon stretching can be disposed above the display panel DP. Thus, by suppressing the tensile strength exceeding that of the stretchable display device 100 during stretching, damage or breakage of the display panel DP due to stretching can be prevented.

[0185] For example, the viewing panel WP can be set on the display element area DA, the first wiring area WA1, the second wiring area WA2, and the transparent area TA.

[0186] Meanwhile, the adhesive layer 193 may be disposed between the display panel DP and the viewing angle panel WP, but is not limited thereto. The display panel DP and the viewing angle panel WP can be joined by the adhesive layer 193. However, this disclosure is not limited thereto, and the adhesive layer 193 may be omitted according to exemplary embodiments. For example, the adhesive layer 193 may include an optically clear adhesive (OCA) or be composed of a rubber-based adhesive, an acrylic-based adhesive, or a silicone-based adhesive.

[0187] The viewing angle panel WP may include a substrate 191, a plurality of structures 190 disposed on the substrate 191, and a protective layer 192 covering the plurality of structures 190 and disposed on the substrate 191.

[0188] The substrate 191 is a structure used to support and protect the multiple structures 190 and the protective layer 192. The substrate 191 is a flexible substrate and may be made of a bendable or stretchable insulating material.

[0189] For example, substrate 191 can be formed of silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE), and thus has flexible properties. However, the material of substrate 191 is not limited to this.

[0190] The substrate 191 is a flexible substrate to allow for reversible expansion and contraction. Furthermore, the elastic modulus of the substrate 191 can range from several MPa to several hundred MPa, and the ductile fracture rate can be 100% or higher. For example, the thickness of the substrate 191 can range from 10 μm to 1 mm, but is not limited to this.

[0191] For example, substrate 191 can be disposed above display element area DA, first wiring area WA1, second wiring area WA2 and transparent area TA.

[0192] Multiple structures 190 can be disposed on the substrate 191. In this case, for example, similar to the substrate 191, the structure 190 can be formed of silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE).

[0193] The process for forming multiple structures 190 on substrate 191 is as follows.

[0194] First, while the substrate 191 is in a semi-cured state, the substrate 191 is stretched in one direction. For example, one direction could be the X-axis direction.

[0195] For example, substrate 191 may be formed of silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE).

[0196] Printing is performed on the stretched substrate 191 as described above to form a plurality of structures 190 on the substrate 191.

[0197] For example, multiple structures 190 can be patterned by embossing. Furthermore, for example, the multiple structures 190 can be formed to be parallel to each other in a Y-axis direction perpendicular to one direction.

[0198] At this time, multiple structures 190 can be formed on the substrate 191 in a stretched state. For example, multiple structures 190 can be formed parallel / parallel in the Y-axis direction and can be formed on the substrate 191 to have a trapezoidal cross-section, in which the width of the upper base is greater than the width of the lower base, but is not limited thereto.

[0199] Next, a protective layer 192 is formed on the substrate 191 on which multiple structures 190 are formed using a low-refractive-index material. For example, the protective layer 192 is formed by coating a low-refractive-index material, or it can be formed by attaching a low-refractive-index optically transparent adhesive (OCA).

[0200] Structure 190 and protective layer 192 may have different refractive indices. In the first exemplary embodiment of this disclosure, the refractive index n1 of structure 190 may be greater than the refractive index n2 of protective layer 192, but this disclosure is not limited thereto.

[0201] The substrate 191 and the protective layer 192 may have different moduli. In the first exemplary embodiment of this disclosure, the modulus m1 of the substrate 191 may be greater than the modulus m2 of the protective layer 192, but this disclosure is not limited thereto.

[0202] The shape of multiple structures 190 can be changed before and after stretching.

[0203] When stretching is performed in the horizontal direction (X-axis direction), the structure 190 of the first exemplary embodiment can be positioned in a direction substantially perpendicular to the stretching direction (Y-axis direction) (see [link]). Figure 3 and Figure 4 For example, multiple structures 190 can be configured parallel to the second connecting line 182. Multiple structures 190 can be configured at predetermined intervals.

[0204] Therefore, multiple structures 190 can be configured to overlap with the second connecting line 182 along the second connecting line 182. Furthermore, multiple structures 190 can be configured to span the first connecting line 181, but are not limited thereto.

[0205] For example, multiple structures 190 have rectangular or square cross-sectional shapes that are parallel / parallel in one direction (i.e., the Y-axis direction) before being stretched (see...). Figure 3 and Figure 4 However, after stretching, it has a trapezoidal cross-sectional shape in which the upper base is wider than the lower base (see...). Figure 5 and Figure 6 ).

[0206] As described above, in the stretchable display device 100 of the first exemplary embodiment of this disclosure, the cross-section of the structure 190 is deformed into a trapezoidal shape (where the upper base is wider than the lower base) to diffuse the light emitted from the LED 160 like a lens. In this case, the viewing angle is widened, and the resolution degradation caused by the stretching of the stretchable display device can be mitigated. That is, by compensating for the number of physical pixels PX through the diffusion of light emitted from the LED 160, the resolution degradation caused by the stretching of the stretchable display device can be mitigated, and image distortion can be minimized or reduced.

[0207] Figure 7 It is a graph showing the brightness according to the viewing angle.

[0208] Figure 7 The results show a comparison of brightness based on viewing angle before and after stretching.

[0209] Reference Figure 7 It should be understood that after stretching, the lateral brightness is improved through light diffusion, depending on the brightness of the viewing angle. Therefore, the viewing angle is expanded in the lateral direction.

[0210] As described above, when a viewing panel with the structure of this disclosure is applied, the cross-section of the stretched structure is changed to a trapezoidal shape with the upper base wider than the lower base, so as to diffuse the light emitted from the LED like a lens.

[0211] Furthermore, this disclosure is also applicable to cases involving stretching in the vertical / vertical direction (i.e., the Y-axis direction), which will be described in detail with reference to the second exemplary embodiment of this disclosure.

[0212] Figure 8 This is a cross-sectional view of a stretchable display device according to a second embodiment of the present disclosure.

[0213] Figure 9 yes Figure 8 A plan view of the viewing panel of a stretchable display device.

[0214] Figure 10 yes Figure 8 A cross-sectional view of the stretchable display device after it has been stretched.

[0215] Figure 11 yes Figure 9 The view panel is a flat view after being stretched.

[0216] Figures 8 to 11 A stretchable display device according to a second exemplary embodiment of the present disclosure is illustrated by taking stretching in the vertical direction (i.e., the Y-axis direction) as an example. In this case, the structure can be arranged in a direction substantially perpendicular to the stretching direction (i.e., the X-axis direction).

[0217] Figure 8 and Figure 10 Is along with Figure 2 A cross-sectional view taken from the same direction as A-A'.

[0218] Figure 9 Is Figure 8 A schematic plan view of a viewing panel corresponding to a subpixel in a stretchable display device.

[0219] Figure 10 and Figure 11 These are cross-sectional views and plan views of the viewing panel of a stretchable display device after it has been stretched in the vertical direction (i.e., the Y-axis direction).

[0220] Figures 8 to 11 The second exemplary embodiment of this disclosure and Figures 2 to 6 The differences between the first exemplary embodiments of this disclosure are the stretching direction and placement direction of the structure, but other constructions are substantially the same, so redundant descriptions will be omitted. Identical constructions will be denoted by the same reference numerals. Here, the description of the same reference numerals can be found by referring to... Figures 1 to 6 .

[0221] refer to Figures 8 to 11 Multiple island substrates 111 can be disposed on the lower substrate 110. The multiple island substrates 111 are spaced apart from each other to be disposed on the lower substrate 110.

[0222] As described above, a sub-pixel SPX may include a display element area DA, a first wiring area WA1, a second wiring area WA2, and a transparent area TA.

[0223] Multiple island-shaped substrates 111 can be arranged in the display element area DA.

[0224] Transistor 150 can be disposed above multiple island substrates 111.

[0225] Transistor 150 can be placed in the display element area DA.

[0226] LED 160 can be disposed above multiple island substrates 111.

[0227] LED 160 can be set in the display element area DA.

[0228] Meanwhile, the first connecting line 181 can be set in the first wiring area WA1.

[0229] In addition, the second connecting line 182 can be set in the second wiring area WA2.

[0230] As described above, the upper substrate 120, the polarizing layer 125, and the upper adhesive layer 118 can be disposed above the lower substrate 110.

[0231] Furthermore, a flexible viewing panel WP having a structure 290 that deforms during stretching according to a second exemplary embodiment of the present disclosure can be disposed above a display panel DP configured as described above.

[0232] The adhesive layer 193 can be disposed between the display panel DP and the viewing panel WP.

[0233] For example, the viewing panel WP can be positioned above the display element area DA, the first wiring area WA1, the second wiring area WA2, and the transparent area TA.

[0234] For example, the viewing angle panel WP according to the second exemplary embodiment of the present disclosure may include a substrate 191, a plurality of structures 290 disposed on the substrate 191, and a protective layer 292 covering the plurality of structures 290 and disposed on the substrate 191.

[0235] Multiple structures 290 can be disposed on the substrate 191. At this time, for example, similar to the substrate 191, the structure 290 can be formed of silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE).

[0236] Structure 290 and protective layer 292 may have different refractive indices. In the second exemplary embodiment of this disclosure, the refractive index n1 of structure 290 may be greater than the refractive index n2 of protective layer 192, but this disclosure is not limited thereto.

[0237] The substrate 191 and the protective layer 292 may have different moduli. In the second exemplary embodiment of this disclosure, the modulus m1 of the substrate 191 may be greater than the modulus m2 of the protective layer 292, but this disclosure is not limited thereto.

[0238] The shape of multiple structures 290 can be changed before and after stretching.

[0239] When stretching is performed in the vertical direction (Y-axis direction), the structure 290 of the second exemplary embodiment can be arranged in a direction substantially perpendicular to the stretching direction (X-axis direction). For example, multiple structures 290 can be arranged parallel to the first connecting line 181. The multiple structures 290 can be arranged at predetermined intervals.

[0240] Therefore, multiple structures 290 can be configured to overlap with the first connecting line 181 along the first connecting line 181. Furthermore, multiple structures 290 can be configured to span the second connecting line 182, but are not limited thereto.

[0241] For example, multiple structures 290 have rectangular or square cross-sectional shapes that are parallel in one direction (i.e., the X-axis direction) before being stretched (see...). Figure 8 and Figure 9 However, after being stretched, it has a trapezoidal cross-sectional shape in which the upper base is wider than the lower base (see...). Figure 10 and Figure 11 ).

[0242] As described above, even if the stretchable display device of the second exemplary embodiment of this disclosure is stretched in the vertical direction (i.e., the Y-axis direction), since the structure 290 is arranged in a direction substantially perpendicular to the stretching direction (i.e., the X-axis direction), the cross-section of the structure 290 is deformed into a trapezoidal shape with the upper base wider than the lower base. Therefore, the light emitted from the LED 160 can be diffused. In this case, the viewing angle is widened, and the resolution degradation caused by the stretching of the stretchable display device can be improved.

[0243] Furthermore, when stretching is performed in either the X-axis or Y-axis, the first and second exemplary embodiments described above can be applied, but are not limited thereto. Therefore, this disclosure can be applied when stretching is performed in any direction, which will be described in detail with reference to the following third exemplary embodiment.

[0244] Figure 12This is a plan view of a stretchable display device according to a third exemplary embodiment of the present disclosure.

[0245] Figure 13 It is along Figure 12 The cross-sectional view taken by line B-B'.

[0246] Figure 14 yes Figure 13 A plan view of the viewing panel of a stretchable display device.

[0247] Figure 15 yes Figure 13 A cross-sectional view of the stretchable display device after it has been stretched.

[0248] Figure 16 yes Figure 14 The view panel is a flat view after being stretched.

[0249] Figures 12 to 16 As an example, a stretchable display device according to a third exemplary embodiment of this disclosure is shown when stretching is performed in any direction.

[0250] Figure 14 Is Figure 13 A schematic plan view of a viewing panel corresponding to a subpixel in a stretchable display device.

[0251] Figure 15 and Figure 16 It is a cross-sectional view and a plan view of the viewing panel of a stretchable display device after stretching in any direction.

[0252] Figures 12 to 16 The third exemplary embodiment of this disclosure and Figures 2 to 6 The first exemplary embodiment of this disclosure and Figures 8 to 11 The difference between the second exemplary embodiments of this disclosure lies in the shape and placement orientation of the structure due to the position of the sub-pixels. However, other constructions are substantially the same, so redundant descriptions will be omitted. Identical constructions will be denoted by the same reference numerals. Here, the description of the same reference numerals can be found by referring to... Figures 1 to 11 .

[0253] Reference Figures 12 to 16 As described above, the sub-pixel SPX of the third exemplary embodiment of this disclosure may include a display element region DA, a first wiring region WA1, a second wiring region WA2, and a transparent region TA.

[0254] In the display element area DA, island substrate 111, display elements such as LED 160, and various driving elements such as transistor 150 can be arranged.

[0255] Multiple sub-pixels (SPXs) can be connected to various wiring lines. For example, multiple sub-pixels (SPXs) can be connected to various wiring lines, such as gate lines, data lines, high-potential power lines, low-potential power lines, and reference voltage lines.

[0256] Meanwhile, the first wiring area WA1 is located on one side of the display element area DA, and can be located between adjacent display element areas DA in the X-axis direction.

[0257] The first connecting line 181 can be set in the first wiring area WA1. The first connecting line 181 refers to the wiring line extending in the X-axis direction in the connecting line 180. Therefore, the first wiring area WA1 can be a horizontally stretched area.

[0258] The first connection line 181 can connect to pads on two island substrates 111 that are arranged in parallel / parallel directions among the pads on top of a plurality of adjacent island substrates 111 in the X-axis direction. The first connection line 181 can be used as a gate line or a low-potential power line, but is not limited thereto.

[0259] In addition, the second wiring area WA2 is located on the other side of the display element area DA, and is located between adjacent display element areas DA in the Y-axis direction.

[0260] The second connecting line 182 can be set in the second wiring area WA2. The second connecting line 182 refers to the wiring in the connecting line 180 that extends in the Y-axis direction. Therefore, the second wiring area WA2 can be a vertically stretched area.

[0261] The second connection line 182 can connect to pads on two parallel / parallel island substrates 111 among pads on top of multiple adjacent island substrates 111 in the Y-axis direction. The second connection line 182 can serve as a data line, a high-potential power line, or a reference voltage line, but is not limited thereto.

[0262] In addition, the transparent area TA can be set between the first wiring area WA1 adjacent in the Y-axis direction and the second wiring area WA2 adjacent in the X-axis direction.

[0263] In the transparent region TA, no opaque components are provided, and a lower substrate 110 formed of an elastomer is provided, so that the transparent region can be semi-transparent. The transparent region TA can be a horizontally and vertically stretched region.

[0264] As described above, the upper substrate 120, the polarizing layer 125, and the upper adhesive layer 118 can be disposed above the lower substrate 110.

[0265] Furthermore, a flexible viewing panel WP having a structure 390 that deforms during stretching according to a third exemplary embodiment of the present disclosure can be disposed above a display panel DP configured as described above.

[0266] The adhesive layer 193 can be disposed between the display panel DP and the viewing panel WP.

[0267] For example, the viewing panel WP can be positioned above the display element area DA, the first wiring area WA1, the second wiring area WA2, and the transparent area TA.

[0268] For example, the viewing angle panel WP according to the third exemplary embodiment of the present disclosure may include a substrate 191, a plurality of structures 390 disposed on the substrate 191, and a protective layer 392 covering the plurality of structures 390 and disposed on the substrate 191.

[0269] Multiple structures 390 can be disposed on the substrate 191. At this time, for example, similar to the substrate 191, the structure 390 can be formed of silicone rubber such as polydimethylsiloxane (PDMS) or elastomer such as polyurethane (PU) or polytetrafluoroethylene (PTFE).

[0270] For example, the structure 390 of the third exemplary embodiment of this disclosure may include first structures 390a' and 390a'", a second structure 390b, and a third structure 390c. The first structure deforms along the vertical direction (i.e., the Y-axis direction) during the stretching process, the second structure deforms along the horizontal direction (i.e., the X-axis direction) during the stretching process, and the third structure deforms along both the horizontal and vertical directions during the stretching process.

[0271] For example, the protective layer 392 may include a first protective layer 392' disposed in the display element region DA and a second protective layer 392 disposed in the first wiring region WA1, the second wiring region WA2 and the transparent region TA.

[0272] For example, the first structures 390a' and 390a' may include a first-1 structure 390a' disposed in the display element region DA and a first-2 structure 390a disposed in the first wiring region WA1 and the transparent region TA.

[0273] In addition, the second structure 390b can be set in the second wiring area WA2 and the transparent area TA.

[0274] In addition, the third structure 390c can be set in the transparent area TA.

[0275] Furthermore, for example, the first-1 structure 390a' can be deformed into a trapezoidal cross-sectional shape during stretching, in which the upper base is narrower than the lower base.

[0276] In contrast, the first-second structure 390a, the second structure 390b, and the third structure 390c can be deformed into a trapezoidal cross-sectional shape during stretching, in which the upper base is wider than the lower base.

[0277] As described above, according to the third exemplary embodiment of the present disclosure, the structures 390 with different placement directions and deformation directions are set according to the positions of the sub-pixels SPX.

[0278] For example, in the display element region DA, the first-first structure 390a' can be set in the X-axis direction. In this case, the first-first structure 390a' can have a rectangular or square cross-sectional shape parallel to one direction (e.g., parallel to the X-axis direction) before stretching (see Figure 13 and Figure 14 ). However, the present disclosure is not limited thereto, and the first-first structure 390a' can have a rectangular or square cross-sectional shape parallel to the Y-axis direction. In addition, the first-first structure 390a' is parallel to one direction as a whole, but it can also be set in a zigzag shape. In addition, the first-first structure 390a' can be set at an angle of about 0 to 10 degrees in the X-axis direction.

[0279] In addition, the first-first structure 390a' can be configured to be deformed into a trapezoidal cross-sectional shape (where the upper base is narrower than the lower base) during stretching to collect the light emitted from the LED 160 (see Figure 15 and Figure 16 ).

[0280] The first-first structure 390a' and the first protective layer 392' can have different refractive indices. The refractive index n1 of the first-first structure 390a' is less than the refractive index n2 of the first protective layer 392'. For example, the value of the refractive index n1 of the first-first structure 390a' is 1.3 < n1 < 1.5, and the value of the refractive index n2 of the first protective layer 392' can be 1.5 < n2 < 1.7, but it is not limited thereto.

[0281] For example, the spacing between the first-first structures 390a' can have a value of 15 μm or less. In addition, the interval S between the first-first structures 390a' can have a value of 5 μm < S < 10 μm. In addition, the height H of the first-first structure 390a' can have a value of 1 μm < H < 10 μm. In addition, the length Lu of the upper base of the first-first structure 390a' can have a value of 2 μm < Lu < 7 μm, and the length Lb of the lower base can have a value of 10 μm < Lb < 14 μm.

[0282] The substrate 191 and the first protective layer 392' can have different moduli.

[0283] According to a third exemplary embodiment of the present disclosure, the modulus m1 of the substrate 191 may be less than the modulus m2 of the first protective layer 392, but the present disclosure is not limited thereto.

[0284] Therefore, the 1-1 structure 390a' of the third exemplary embodiment of the present disclosure may be deformed into a trapezoidal cross-sectional shape after stretching, in which the upper base is narrower than the lower base (see Figure 15 and Figure 16 ).

[0285] Therefore, the light emitted from the LED 160 is collected in the display element region DA to allow a clearer image to be seen.

[0286] For example, in the first wiring region WA1, the 1-2 structure 390a'' may be provided in the X-axis direction. In this case, the 1-2 structure 390a'' has a rectangular or square cross-sectional shape parallel to one direction (for example, in the X-axis direction) before stretching (see Figure 13 and 14 ). However, the present disclosure is not limited thereto, and the 1-2 structure 390a'' may have a rectangular or square cross-sectional shape parallel to the Y-axis direction. In addition, the 1-2 structure 390a'' is parallel to one direction as a whole, but may also be provided in a zigzag shape. In addition, the 1-2 structure 390a'' may be provided at an angle of about 0 to 10 degrees in the X-axis direction.

[0287] For example, the 1-2 structure 390a'' may be provided parallel to the first connection line 181. A plurality of 1-2 structures 390a'' may be provided at a predetermined interval.

[0288] Therefore, for example, the 1-2 structure 390a'' may be provided to overlap the first connection line 181 along the first connection line 181.

[0289] In addition, the 1-2 structure 390a'' may be configured to be deformed into a trapezoidal cross-sectional shape during stretching, in which the upper base is wider than the lower base, to diffuse the light emitted from the LED 160 (see Figure 15 and Figure 16 ).

[0290] The 1-2 structure 390a'' and the second protective layer 392'' may have different refractive indices.

[0291] The refractive index n3 of the 1-2 structure 390a'' may be greater than the refractive index n4 of the second protective layer 392''. For example, the value of the refractive index n3 of the 1-2 structure 390a'' is 1.5 < n3 < 1.7, and the value of the refractive index n4 of the second protective layer 392'' is 1.3 < n4 < 1.5, but is not limited thereto. <00007For example, the spacing between the first and second structures 390a” may have a value of 15 μm or less. In addition, the interval S between the first and second structures 390a” may have a value of 5 μm < S < 10 μm. In addition, the height H of the first and second structures 390a” may have a value of 1 μm < H < 10 μm. In addition, the length Lu of the upper base of the first and second structures 390a may have a value of 10 μm < Lu < 14 μm, and the length Lb of the lower base may have a value of 2 μm < Lb < 7 μm.

[0293] Meanwhile, the second structure 390b may be disposed in the second wiring region WA2 in the Y-axis direction. In this case, the second structure 390b may have a rectangular or square cross-sectional shape parallel to one direction (e.g., the Y-axis direction) before stretching (see Figure 13 and Figure 14 ). However, the present disclosure is not limited thereto, and the second structure 390b may have a rectangular or square cross-sectional shape parallel to the X-axis direction. In addition, the second structure 390b is parallel to one direction as a whole, but may also be arranged in a zigzag shape. In addition, the second structure 390b may be disposed at an angle of about 0 to 10 degrees in the Y-axis direction.

[0294] For example, the second structure 390b may be arranged parallel to the second connection line 182. A plurality of second structures 390b may be arranged at a predetermined interval.

[0295] Therefore, a plurality of second structures 390b may be arranged to overlap the second connection line 182 along the second connection line 182.

[0296] In addition, the second structure 390b is configured to be deformed into a trapezoidal cross-sectional shape during stretching, in which the upper base is wider than the lower base to diffuse the light emitted from the LED 160 (see Figure 15 and Figure 16 ).

[0297] The second structure 390b and the second protective layer 392” may have different refractive indices.

[0298] The refractive index n3 of the second structure 390b may be greater than the refractive index n4 of the second protective layer 392”. For example, the value of the refractive index n3 of the second structure 390b is 1.5 < n3 < 1.7, and the value of the refractive index n4 of the second protective layer 392” is 1.3 < n4 < 1.5.

[0299] For example, the spacing between the second structures 390b may have a value of 15 μm or less. In addition, the interval S between the second structures 390b may have a value of 5 μm < S < 10 μm. In addition, the height H of the second structures 390b may have a value of 1 μm < H < 10 μm. In addition, the length Lu of the upper base of the second structures 390b may have a value of 10 μm < Lu < 14 μm, and the length Lb of the lower base may have a value of 2 μm < Lb < 7 μm.

[0300] In addition, in the first wiring region WA1 and the second wiring region WA2, the substrate 191 and the second protective layer 392” have different moduli.

[0301] According to the third exemplary embodiment of the present disclosure, the modulus m1 of the substrate 191 may be greater than the modulus m2 of the second protective layer 392”, but the present disclosure is not limited thereto.

[0302] Therefore, the 1-2 structure 390a” and the second structure 390b of the third exemplary embodiment of the present disclosure may be deformed into a trapezoidal cross-sectional shape after being stretched, in which the upper base is wider than the lower base (see Figure 15 and Figure 16 ).

[0303] Therefore, the light emitted from the LED 160 is diffused vertically and horizontally in the first wiring region WA1 and the second wiring region WA2 to expand the viewing angle and improve the resolution degradation caused by the stretching of the stretchable display device.

[0304] In addition, according to the third exemplary embodiment of the present disclosure, the 1-2 structure 390a” and the second structure 390b are provided corresponding to the upper part of the first connection line 181 in the first wiring region WA1 and the upper part of the second connection line 182 in the second wiring region WA2. By doing so, the visibility of the micro-yellow reflection caused by the connection line 180 can be improved.

[0305] Meanwhile, in the transparent region TA, the 1-2 structure 390a”, the second structure 390b, and the third structure 390c may be provided. The 1-2 structure 390a”, the second structure 390b, and the third structure 390c provided in the transparent region TA have a rectangular or square cross-sectional shape before being stretched (see Figure 13 and Figure 14 ). For example, multiple 1-2 structures 390a”, second structures 390b, and third structures 390c may be randomly provided.

[0306] The third structure 390c and the second protective layer 392” may have different refractive indices.

[0307] The refractive index n5 of the third structure 390c may be greater than the refractive index n4 of the second protective layer 392”. For example, the value of the refractive index n5 of the third structure 390c is 1.5 < n5 < 1.7, and the value of the refractive index n4 of the second protective layer 392” is 1.3 < n4 < 1.5.

[0308] The spacing between the 1-2 structure 390a”, the second structure 390b, and the third structure 390c may have a value of 15 μm or less. In addition, the interval S between the 1-2 structure 390a”, the second structure 390b, and the third structure 390c may have a value of 5 μm < S < 10 μm. In addition, the height H of the third structure 390c may have a value of 1 μm < H < 10 μm. In addition, the length Lu of the upper base of the third structure 390c may have a value of 10 μm < Lu < 14 μm, and the length Lb of the lower base may have a value of 2 μm < Lb < 7 μm.

[0309] The substrate 191 and the second protective layer 392” in the transparent region TA may have different moduli.

[0310] In addition, for example, the 1-2 structure 390a”, the second structure 390b, and the third structure 390c in the transparent region TA may be configured to deform into a trapezoidal cross-sectional shape (where the upper base is wider than the lower base) during stretching to diffuse the light emitted from the LED 160 (see Figure 15 and Figure 16 ).

[0311] Therefore, the effect of vertically and horizontally diffusing the light emitted from the LED 160 in the transparent region TA to expand the viewing angle is achieved, and the resolution degradation caused by the stretching of the stretchable display device can be improved.

[0312] As described above, according to the third exemplary embodiment of the present disclosure, not only when stretched in one direction (such as the X-axis or Y-axis), but also when stretched in an arbitrary direction or various directions, the light emitted from the LED 160 is vertically and horizontally diffused. Therefore, the resolution degradation caused by the stretching of the stretchable display device can be effectively improved.

[0313] Meanwhile, in the above first to third embodiments, an LED is taken as an example of the display element, but it is not limited thereto. However, in the present disclosure, an organic light emitting diode is used as the display element, which will be described in detail in reference to the following fourth exemplary embodiment.

[0314] Figure 17 is a plan view of a stretchable display device according to a fourth exemplary embodiment of the present disclosure.

[0315] Figure 18 is along Figure 17The cross-sectional view taken from C-C'.

[0316] Figure 19 yes Figure 17 A cross-sectional view of the stretchable display device after it has been stretched.

[0317] Figures 17 to 19 As an example, a stretchable display device according to a fourth exemplary embodiment of this disclosure is shown when stretching is performed in any direction.

[0318] Figure 19 It is a cross-sectional view of the stretchable display device after stretching when stretched in any direction.

[0319] Figures 17 to 19 The fourth exemplary embodiment of this disclosure and Figures 12 to 16 The difference between the above-described third exemplary embodiments lies in the use of an organic light-emitting diode as the display device; however, the other structures are essentially the same, and therefore redundant descriptions will be omitted. Identical structures will be denoted by the same reference numerals. Here, the description of the same reference numerals can be found by referring to... Figures 1 to 16 .

[0320] Reference Figures 17 to 19 As described above, multiple island-shaped substrates 111 can be disposed on the lower substrate 110.

[0321] The buffer layer 112 can be disposed on multiple island substrates 111.

[0322] A transistor 150, including a gate electrode 151, an active layer 152, a source electrode 153, and a drain electrode 154, can be formed above the buffer layer 112.

[0323] The gate pad 171 can be disposed on the gate insulating layer 113.

[0324] A planarization layer 115 may be disposed above the transistor 150 and the interlayer insulating layer 114. The planarization layer 115 planarizes the upper part of the transistor 150. The planarization layer 115 may be composed of a single layer or multiple layers and may be formed of an organic material. For example, the planarization layer 115 may be formed of an acrylic organic material, but is not limited thereto. The planarization layer 115 may include contact holes for electrically connecting the transistor 150 and the anode 461, contact holes for electrically connecting the data pad 173 and the source electrode 153, and contact holes for electrically connecting the connection pad 172 and the gate pad 171.

[0325] In some exemplary embodiments, an additional insulating layer may be formed between the transistor 150 and the planarization layer 115. The additional insulating layer covering the transistor 150 may be provided to protect the transistor 150 from moisture and oxygen penetration. The additional insulating layer may be formed of an inorganic material and may be formed as a single layer or a double layer. The additional insulating layer may be a passivation layer, but this disclosure is not limited thereto.

[0326] Data pad 173, connection pad 172 and organic light-emitting diode 460 can be disposed above planarization layer 115.

[0327] The organic light-emitting element 460 can be configured to correspond to each of the multiple sub-pixels SPX and emit light with a specific wavelength. For example, the organic light-emitting diode 460 can be a blue organic light-emitting diode that emits blue light, a red organic light-emitting diode that emits red light, a green organic light-emitting diode that emits green light, or a white organic light-emitting diode that emits white light, but is not limited thereto. When the organic light-emitting diode 460 is a white organic light-emitting diode, the stretchable display device 400 may also include a color filter.

[0328] The organic light-emitting diode 460 may include an anode 461, an organic light-emitting layer 462, and a cathode 463. Specifically, the anode 461 may be disposed on the planarization layer 115. In this case, the anode 461 serves as an electrode for providing holes to the organic light-emitting layer 462. The anode 461 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), or indium tin zinc oxide (ITZO). The anode 461 may be formed of the same material as, but is not limited to, the data pads 173 and gate pads 171 disposed on the planarization layer 115. Furthermore, when the stretchable display device 400 is implemented as a top-emitting type, the anode 461 may also include a reflector.

[0329] Anodes 461 are configured to be spaced apart from each other for each sub-pixel SPX, so as to be electrically connected to transistors 150 through contact holes in planarization layer 115. For example, in Figure 18 and Figure 19 In the example shown, the anode 461 is electrically connected to the drain electrode 154 of the transistor 150, but this disclosure is not limited thereto, and the anode 461 may be electrically connected to the source electrode 153.

[0330] A dam 116 may be formed over the anode 461, data pad 173, connection pad 172, and planarization layer 115. The dam 116 is a component that separates adjacent sub-pixel SPXs. The dam 116 is configured to cover at least a portion of both sides of the adjacent anode 461 to expose a portion of the top surface of the anode 461. The dam 116 can suppress the problem that current concentration at the corners of the anode 461 causes light to be emitted onto the side surface of the anode 461, resulting in unwanted sub-pixel SPX emission or color mixing. For example, the dam 116 may be formed of polyimide, acrylic resin, or benzocyclobutene (BCB)-based resin, but is not limited to these.

[0331] Here, the dam 116 includes contact holes for connecting the connecting line 180, which is a data line, and the data pad 173, and contact holes for connecting the connecting line 180, which is a gate line, and the connecting pad 172.

[0332] An organic light-emitting layer 462 may be disposed on the anode 461. The organic light-emitting layer 462 may be configured to emit light. The organic light-emitting layer 462 may include a light-emitting material, and the light-emitting material may include, but is not limited to, phosphorescent or fluorescent materials.

[0333] The organic light-emitting layer 462 is configured as a light-emitting layer, but is not limited thereto, and may have a stacked structure in which multiple light-emitting layers are stacked and a charge-generating layer is present between them. In addition, the organic light-emitting layer 462 may also include at least one organic layer selected from hole transport layer, electron transport layer, hole blocking layer, electron blocking layer, hole injection layer and electron injection layer.

[0334] A cathode 463 may be disposed on the organic light-emitting layer 462. The cathode 463 may supply electrons to the organic light-emitting layer 462. For example, the cathode 463 may be formed of a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and tin oxide (TO) or ytterbium (Yb) alloys. Alternatively, the cathode 463 may be formed of a metallic material.

[0335] The cathode 463 can be patterned to overlap with the plurality of island substrates 111. The cathode 463 is formed only in the regions overlapping with the plurality of island substrates 111, and may not be formed in the regions between the plurality of island substrates 111. Since the cathode 463 is formed of a material such as a transparent conductive oxide or a metallic material, when the cathode 463 is formed in the regions between the plurality of island substrates 111, the cathode 463 may be damaged during the stretching of the stretchable display device 400. Therefore, the cathode 463 can be configured to correspond to each of the plurality of island substrates 111 on a flat surface. The cathode 463 is configured to have regions in the regions overlapping with the plurality of island substrates 111 that do not overlap with the regions where the connecting lines 180 are provided.

[0336] Unlike typical organic light-emitting display devices, in the stretchable display device 400 according to the fourth exemplary embodiment of this disclosure, the cathode 463 is patterned to correspond to a plurality of island substrates 111. Therefore, the cathodes 463 disposed above the plurality of island substrates 111 can be independently supplied with low-potential power via the connecting lines 180.

[0337] An encapsulation layer 417 may be disposed above the organic light-emitting diode 460. The encapsulation layer 417 covers the organic light-emitting diode 460 and contacts a portion of the top surface of the dike 116 to seal the organic light-emitting diode 460. Therefore, the encapsulation layer 417 can protect the organic light-emitting diode 460 from moisture, air, or physical impacts that may penetrate from the outside.

[0338] Encapsulation layer 417 covers cathodes 463 patterned to overlap with a plurality of island substrates 111, and may be disposed in each of the plurality of island substrates 111. Encapsulation layer 417 is configured to cover one cathode 463 disposed in one island substrate 111, and encapsulation layers 417 disposed on the plurality of island substrates 111 may be spaced apart from each other.

[0339] The encapsulation layer 417 may be formed only in the region overlapping with the plurality of island substrates 111. As described above, the encapsulation layer 417 may be configured to include an inorganic layer, making it susceptible to breakage or damage during the stretching of the stretchable display device 400. Specifically, since the organic light-emitting diode 460 is susceptible to moisture or oxygen, damage to the encapsulation layer 417 would reduce the reliability of the organic light-emitting diode 460. Therefore, in the stretchable display device 400 according to the fourth exemplary embodiment of the present disclosure, the encapsulation layer 417 is not formed in the region between the plurality of island substrates 111. Therefore, even if the stretchable display device 400 is bent or stretched and deformed, damage to the encapsulation layer 417 can be minimized or reduced.

[0340] As described above, the upper substrate 120, the polarizing layer 125, and the upper adhesive layer 118 can be disposed above the lower substrate 110.

[0341] Furthermore, a flexible viewing panel WP having a structure 390 that deforms during stretching according to a fourth exemplary embodiment of the present disclosure can be disposed above a display panel DP constructed as described above.

[0342] The adhesive layer 193 can be disposed between the display panel DP and the viewing panel WP.

[0343] For example, the viewing angle panel WP according to the fourth exemplary embodiment of this disclosure may include a substrate 191, a plurality of structures 390 disposed on the substrate 191, and a protective layer 392 covering the plurality of structures 390 and disposed on the substrate 191. Here, the viewing angle panel WP of the fourth exemplary embodiment is substantially the same as the viewing angle panel of the third exemplary embodiment, and therefore its description will be omitted.

[0344] Exemplary embodiments of this disclosure can also be described as follows:

[0345] According to one aspect of this disclosure, a stretchable display device is provided. The stretchable display device includes: a lower substrate defining a plurality of pixels, each pixel including a plurality of sub-pixels; a plurality of island substrates disposed on the lower substrate and spaced apart from each other, each island substrate corresponding to a corresponding pixel; a plurality of connecting lines electrically connecting pads disposed in adjacent island substrates among the plurality of island substrates; an upper substrate disposed above the lower substrate; and a viewing angle panel disposed above the upper substrate and including a plurality of structures configured to deform during stretching, each sub-pixel including a display element region, a first wiring region, a second wiring region, and a transparent region.

[0346] The lower substrate and the upper substrate may have higher ductility than the plurality of island substrates, and the modulus of the plurality of island substrates may be higher than the modulus of the lower substrate and the upper substrate.

[0347] The display element area may include a display element and a driving element for driving the display element. The display element may include an LED, an organic light-emitting diode, or a liquid crystal display element, and the driving element may include a transistor.

[0348] The first wiring area may be located on one side of the display element area and may be located between adjacent display element areas in one direction, and a first connecting line extending in one direction may be provided in the first wiring area.

[0349] The second wiring area may be located on the other side of the display element area, and may be located between adjacent display element areas in another direction, and a second connecting line extending in another direction may be provided in the second wiring area.

[0350] The transparent area can be positioned between the first wiring areas that are adjacent in another direction and between the second wiring areas that are adjacent in one direction.

[0351] The viewing panel can be positioned above the display element area, the first wiring area, the second wiring area, and the transparent area.

[0352] The viewing panel may include: a substrate; a plurality of structures disposed on the substrate; and a protective layer covering the plurality of structures and disposed on the substrate.

[0353] The refractive index of the structure can be greater than that of the protective layer, and the modulus of the substrate can be greater than that of the protective layer.

[0354] The plurality of structures can be arranged in a direction parallel to the second connecting line, the plurality of structures can be configured to overlap with the second connecting line along the second connecting line, and the plurality of structures can be arranged across the first connecting line.

[0355] The plurality of structures can be arranged in a direction parallel to the first connecting line, the plurality of structures can be arranged along the first connecting line and overlapping the first connecting line, and the plurality of structures can be arranged across the second connecting line.

[0356] The plurality of structures may have a rectangular or square cross-sectional shape before being stretched, and may be deformed into a trapezoidal cross-sectional shape after being stretched, wherein the upper base is wider than the lower base.

[0357] The structure may include: a first structure, which deforms in another direction when stretched; a second structure, which deforms in the first direction when stretched; and a third structure, which deforms in both the first and second directions when stretched.

[0358] The protective layer may include: a first protective layer disposed in the display element area; and a second protective layer disposed in the first wiring area, the second wiring area, and the transparent area.

[0359] The first structure may include: a first-1 structure disposed in the display element area and a first-2 structure disposed in the first wiring area and the transparent area.

[0360] The second structure can be disposed in the second wiring area and the transparent area, and the third structure can be disposed in the transparent area.

[0361] When the first-1 structure is stretched, the first-1 structure can be deformed into a trapezoidal cross-sectional shape with an upper base narrower than the lower base, and when the first-2 structure, the second structure and the third structure are stretched, the first-2 structure, the second structure and the third structure can be deformed into a trapezoidal cross-sectional shape with an upper base wider than the lower base.

[0362] The refractive index of the 1-1 structure can be less than the refractive index of the first protective layer, and the modulus of the substrate can be less than the modulus of the first protective layer.

[0363] The first-2 structures can be arranged in a direction parallel to the first connecting line, and the plurality of first-2 structures are arranged to overlap with the first connecting line along the first connecting line. The second structure can be arranged in a direction parallel to the second connecting line, and the plurality of second structures are arranged to overlap with the second connecting line along the second connecting line.

[0364] The refractive index of the first-second structure can be greater than the refractive index of the second protective layer, the refractive index of the second structure can be greater than the refractive index of the second protective layer, and the modulus of the substrate can be greater than the modulus of the second protective layer.

[0365] In the transparent area, the first-second structure, the second structure, and the third structure can be randomly set.

[0366] While exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and may be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above exemplary embodiments are illustrative in all respects and do not limit the present disclosure. All technical concepts within the equivalent scope of the present disclosure should be construed as falling within the scope of the present disclosure.

[0367] Cross-references to related applications

[0368] This application claims priority to Korean Patent Application No. 10-2024-0117844, filed with the Korean Intellectual Property Office on August 30, 2024, the disclosure of which is incorporated herein by reference.

Claims

1. A stretchable display device, the stretchable display device comprising: a lower substrate in which a plurality of pixels are defined, the pixels including a plurality of sub-pixels; a plurality of island substrates provided on the lower substrate and spaced apart from each other, each of the plurality of island substrates corresponding to a respective pixel; a plurality of connection lines electrically connecting pads provided in adjacent ones of the plurality of island substrates; an upper substrate provided above the lower substrate; and a viewing angle panel provided above the upper substrate and including a plurality of structures configured to deform during stretching, wherein each sub-pixel includes a display element region, a first wiring region, a second wiring region, and a transparent region. The lower substrate and the upper substrate have higher ductility than the plurality of island substrates, and the plurality of island substrates have higher modulus than the lower substrate and the upper substrate.

2. The stretchable display device of claim 1, wherein, A display element and a driving element for driving the display element are provided in the display element region, the display element including an LED, an organic light emitting diode, or a liquid crystal display element, and the driving element including a transistor.

3. The stretchable display device of claim 1, wherein, The first wiring region is provided on one side of the display element region and between the display element regions adjacent in one direction, and 4. The stretchable display device of claim 1, wherein, wherein a first connection line extending in one direction is provided in the first wiring region. The second wiring region is provided on the other side of the display element region and between the display element regions adjacent in the other direction, and 5. The stretchable display device of claim 4, wherein, wherein a second connection line extending in the other direction is provided in the second wiring region. The transparent region is provided between the first wiring regions adjacent in the other direction and between the second wiring regions adjacent in one direction.

6. The stretchable display device of claim 5, wherein, The viewing angle panel is provided above the display element region, the first wiring region, the second wiring region, and the transparent region.

7. The stretchable display device of claim 1, wherein, The viewing angle panel includes:

8. The stretchable display device of claim 5, wherein, a substrate; a plurality of structures provided on the substrate; and a protective layer covering the plurality of structures and provided on the substrate. The structures have a refractive index greater than a refractive index of the protective layer, and the substrate has a modulus greater than a modulus of the protective layer.

9. The stretchable display device of claim 8, wherein, The plurality of structures are provided in a direction parallel to the second connection lines, the plurality of structures being provided to overlap the second connection lines along the second connection lines, and the plurality of structures being provided across the first connection lines.

10. The stretchable display device of claim 8, wherein, The plurality of structures are provided in a direction parallel to the first connection lines, the plurality of structures being provided to overlap the first connection lines along the first connection lines, and the plurality of structures being provided across the second connection lines.

11. The stretchable display device of claim 8, wherein, The plurality of structures have a rectangular or square cross-sectional shape before being stretched and are deformed to have a trapezoidal cross-sectional shape after being stretched, in which an upper base is wider than a lower base.

12. The stretchable display device of claim 10 or 11, wherein, The structures include:

13. The stretchable display device of claim 8, wherein, a first structure that deforms in the other direction when the first structure is stretched; ​ a second structure that deforms in the one direction when the second structure is stretched; and a third structure that deforms in the one direction and the other direction when the third structure is stretched.

14. The stretchable display device of claim 13, wherein, The protective layer includes: a first protective layer provided in the display element region; and a second protective layer provided in the first wiring region, the second wiring region, and the transparent region.

15. The stretchable display device of claim 14, wherein, The first structure includes: a 1-1 structure provided in the display element region; and a 1-2 structure provided in the first wiring region and the transparent region, and wherein the second structure is provided in the second wiring region and the transparent region, and the third structure is provided in the transparent region.

16. The stretchable display device of claim 15, wherein, When the 1-1 structure is stretched, the 1-1 structure deforms to have a trapezoidal cross-sectional shape with a narrow upper base than a lower base, and when the 1-2 structure, the second structure, and the third structure are stretched, the 1-2 structure, the second structure, and the third structure deform to have a trapezoidal cross-sectional shape with a wide upper base than a lower base.

17. The stretchable display device of claim 15, wherein, The 1-1 structure has a refractive index smaller than a refractive index of the first protective layer, and the substrate has a modulus smaller than a modulus of the first protective layer.

18. The stretchable display device of claim 15, wherein, The 1-2 structure is provided in a direction parallel to the first connection line, the 1-2 structure is provided to overlap the first connection line along the first connection line, and the second structure is provided in a direction parallel to the second connection line, and the second structure is provided to overlap the second connection line along the second connection line.

19. The stretchable display device of claim 15, wherein, The 1-2 structure has a refractive index greater than a refractive index of the second protective layer, the second structure has a refractive index greater than a refractive index of the second protective layer, and the substrate has a modulus greater than a modulus of the second protective layer.

20. The stretchable display device of claim 15, wherein, In the transparent region, the 1-2 structure, the second structure, and the third structure are provided at random.

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