KR102661877B1 - Stretchable display device - Google Patents

Abstract

The present invention relates to a stretchable display device. The stretchable display device according to an embodiment of the present invention has a plurality of sub-pixels defined, a plurality of first regions spaced apart from each other, and one of the plurality of first regions. A lower substrate including a plurality of second regions in which a plurality of connection wires connecting adjacent first regions are arranged and a plurality of third regions excluding the plurality of first regions and the plurality of second regions, a plurality of first regions, It includes a plurality of additional sub-pixels arranged in each of the three regions and a plurality of piezoelectric patterns electrically connected to each of the plurality of additional sub-pixels. Accordingly, it is possible to minimize deterioration in image quality of the stretchable display device when the display device is stretched.

Description

Stretchable display device {STRETCHABLE DISPLAY DEVICE}

The present invention relates to a stretchable display device, and more specifically, to a stretchable display device in which the aperture ratio is improved and image quality is compensated even when stretched.

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

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

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

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

Such stretchable display devices are implemented to be divided into a rigid region and a flexible region. Specifically, the rigid region is the region where the display element is placed and actual light is emitted, and the flexible region is the region where the stretchable display device is actually stretched when force is applied.

As described above, when stretching a stretchable display device, the entire stretchable display device may not be stretched uniformly and only the flexible region may be substantially stretched. Accordingly, when the stretchable display device is stretched, the distance between rigid areas increases, and accordingly, the distance between light emitting elements also increases. Accordingly, the density of the light emitting area in the stretchable display device decreases, and image quality deteriorates. Accordingly, when the stretchable display device is stretched, the grid feeling felt by the user, that is, the stripe-shaped stains visible due to the decrease in luminance in the area between the plurality of light emitting elements, becomes more severe. In addition, when the stretchable display device is stretched, the screen sags in the stretching direction, distorting the ratio of the image displayed on the stretchable display device.

The inventors of the present invention recognized the problems in stretching the stretchable display device as described above, and invented a stretchable display device with a new structure that can solve the problem.

The problem to be solved by the present invention is to provide a stretchable display device that can minimize deterioration in image quality of the display device when the stretchable display device is stretched by disposing a plurality of additional light-emitting devices on the lower substrate. will be.

Another problem that the present invention aims to solve is a stretchable display that can reduce the appearance of lattice-shaped irregularities when stretching the stretchable display device by arranging a plurality of additional light-emitting devices on the flexible area between the plurality of light-emitting devices. The device is provided.

Another problem that the present invention aims to solve is that the ratio of the image displayed on the stretchable display device is distorted when the stretchable display device is stretched by disposing a plurality of additional light emitting devices on the flexible area between the plurality of light emitting devices. The goal is to provide a stretchable display device that can compensate for this.

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

In order to solve the above-described problem, a stretchable display device according to an embodiment of the present invention has a plurality of sub-pixels defined, a plurality of first regions spaced apart from each other, and adjacent first regions among the plurality of first regions. A lower substrate including a plurality of second regions with a plurality of connection wires connecting one region and a plurality of third regions excluding the plurality of first regions and the plurality of second regions, each of the plurality of third regions It includes a plurality of additional sub-pixels disposed in and a plurality of piezoelectric patterns electrically connected to each of the plurality of additional sub-pixels. Accordingly, it is possible to minimize deterioration in image quality of the stretchable display device when the display device is stretched.

In order to solve the above-described problem, a stretchable display device according to another embodiment of the present invention includes a plurality of light-emitting devices arranged, a plurality of rigid substrates spaced apart from each other, and rigid substrates adjacent to each other among the plurality of rigid substrates. A plurality of connection wires electrically connecting the pads disposed in, a lower substrate disposed below the plurality of rigid substrates and the plurality of connection wirings, and a plurality of additions arranged to be spaced apart from the plurality of rigid substrates and the plurality of connection wirings on the lower substrate. It is electrically connected to the light emitting element and the plurality of additional light emitting elements, and includes a plurality of piezoelectric patterns that generate a first voltage by stretching the lower substrate, and minimizes the lattice feeling generated when the lower substrate is stretched. , light may be emitted from a plurality of additional light-emitting elements by the first voltage from the plurality of piezoelectric patterns.

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

The present invention has the effect of efficiently utilizing the area of the stretchable display device and increasing the aperture ratio at the same time by arranging additional sub-pixels in the remaining area of the lower substrate excluding the area where the plurality of island substrates and the plurality of connection wires are arranged. There is.

The present invention has the effect of increasing resolution by connecting additional sub-pixels to different circuit parts from existing sub-pixels, so that each sub-pixel operates independently.

The present invention has the effect of increasing the area of the light emitting area by efficiently utilizing a limited area by arranging additional pixels in an area that served as a dummy area on the lower substrate.

The present invention arranges a plurality of additional light-emitting devices capable of emitting light when the stretchable display device is stretched between the plurality of light-emitting devices, so that the distance between the plurality of light-emitting devices increases when the stretchable display device is stretched. It has the effect of compensating for the decrease in luminance.

The present invention has the effect of minimizing screen distortion and grid-like appearance when the stretchable display device is stretched by disposing a plurality of additional sub-pixels on the flexible area between the plurality of island substrates.

The effects according to the present invention are not limited to the contents exemplified above, and further various effects are included in the present specification.

1 is an exploded perspective view of a stretchable display device according to an embodiment of the present invention.
Figure 2 is an enlarged plan view of a stretchable display device according to an embodiment of the present invention.
Figure 3 is a schematic cross-sectional view of a sub-pixel and an additional sub-pixel of a stretchable display device according to an embodiment of the present invention.
Figure 4 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention.
Figure 5 is a schematic cross-sectional view of a sub-pixel and an additional sub-pixel of a stretchable display device according to another embodiment of the present invention.
Figure 6 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention.
Figure 7 is a schematic cross-sectional view of a sub-pixel and an additional sub-pixel of a stretchable display device according to another embodiment of the present invention.
Figure 8 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention.
9 is a schematic cross-sectional view of an additional sub-pixel of a stretchable display device according to another embodiment of the present invention.
10A and 10B are schematic process diagrams of a stretchable display device according to another embodiment of the present invention.
11A and 11B are schematic plan views of additional sub-pixels according to another embodiment of the present invention.
12A and 12B are schematic cross-sectional views of additional sub-pixels of a stretchable display device according to another embodiment of the present invention.

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

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in the specification are used, other parts may be added unless 'only' is used. In cases where a component is expressed in the singular, the plural is included unless specifically stated otherwise.

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

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

When an element or layer is referred to as being on another element or layer, it includes all cases where another layer or other element is interposed directly on or in the middle of another element.

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

Like reference numerals refer to like elements throughout the specification.

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

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. It may be possible to conduct them together due to a related relationship.

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

1 is an exploded perspective view of a display device according to an embodiment of the present invention. Referring to FIG. 1, the stretchable display device 100 includes a lower substrate 110, a plurality of island substrates 111, a plurality of connection substrates (CS), a COF (Chip on Film), and a printed circuit board. (180), an upper substrate 160, and a polarizing layer 190. In FIG. 1 , illustration of a plurality of additional connection boards (CSA) is omitted for convenience of explanation.

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

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

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

The display area AA is an area where an image is displayed in the stretchable display device 100, and a plurality of light-emitting devices 140 and various driving devices for driving the plurality of light-emitting devices 140 are disposed.

The non-display area (NA) is an area adjacent to the display area (AA). The non-display area (NA) is an area adjacent to the display area (AA) and surrounding the display area (AA). The non-display area (NA) is an area where images are not displayed, and wiring and circuit parts may be formed. For example, a plurality of pads may be disposed in the non-display area (NA), and each pad may include a plurality of light-emitting devices 140 in the display area (AA) and driving devices for driving the light-emitting devices 140. can be connected to

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

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

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

As the plurality of island substrates 111 having rigid characteristics are disposed on the lower substrate 110, some areas of the lower substrate 110 that overlap the plurality of island substrates 111 are attached to the plurality of island substrates 111. It can be defined as a rigid region with rigidity. Additionally, the remaining area of the lower substrate 110 that does not overlap the plurality of island substrates 111 can be defined as a flexible area because only the lower substrate 110 is disposed. That is, the area where the plurality of island substrates 111 are disposed may be defined as a plurality of rigid regions, and the area where the plurality of island substrates 111 are not disposed may be defined as a flexible region. At this time, since the plurality of island substrates 111 are arranged to be spaced apart from each other, the plurality of rigid regions may also be defined as being arranged to be spaced apart from each other, and the flexible region may be defined as surrounding the plurality of rigid regions.

At this time, in some embodiments, the portion of the lower substrate 110 disposed in the rigid region may have a higher modulus than the portion disposed in the flexible region. That is, the area of the lower substrate 110 that overlaps the island substrate 111 may be made of a material with a modulus similar to that of the island substrate 111, and the area that does not overlap the island substrate 111 may be made of a material having a modulus similar to that of the island substrate 111. It may be made of a material with a lower modulus.

A plurality of connection substrates CS are disposed between the plurality of island substrates 111 . The plurality of connection substrates CS are substrates that connect the plurality of island substrates 111 adjacent to each other. The plurality of connection substrates CS may be formed integrally with the plurality of island substrates 111, but is not limited thereto.

The plurality of connection substrates CS have a curved shape. For example, as shown in FIG. 1, the plurality of connection substrates CS may have a sinusoidal shape. However, the shape of the plurality of connection substrates CS is not limited to this. For example, the plurality of connection substrates CS may extend in a zigzag shape, and a plurality of diamond-shaped substrates may be connected and extend at the vertices. It can have various shapes, such as: Additionally, the number and shape of the plurality of connection substrates CS shown in FIG. 1 are exemplary, and the number and shape of the plurality of connection substrates CS may vary depending on the design, but are not limited thereto.

The COF 170 is a film in which various components are placed on a flexible base film 171, and includes a plurality of light-emitting elements 140 in the display area AA and various driving elements for driving the plurality of light-emitting elements 140. It is a component for supplying signals to the device. The COF 170 may be bonded to a plurality of pads disposed in the non-display area NA, and transmits power voltage, data voltage, gate voltage, etc. to the plurality of light emitting elements 140 and the display area AA through the pads. It is supplied to each of the various driving elements for driving the plurality of light emitting elements 140. The COF 170 includes a base film 171 and a driver IC 172, and various other components may be placed therein.

The base film 171 is a layer that supports the driving IC 172 of the COF 170. The base film 171 may be made of an insulating material, for example, an insulating material with flexibility.

The driving IC 172 is a component that processes data for displaying images and driving signals for processing them. In FIG. 1, the driver IC 172 is shown as being mounted using the COF 170 method, but this is not limited to this, and the driver IC 172 is mounted using a COG (Chip On Glass), TCP (Tape Carrier Package) method, etc. It could be.

The printed circuit board 180 may be equipped with a control unit such as an IC chip or circuit unit. Additionally, memory, processors, etc. may be mounted on the printed circuit board 180. The printed circuit board 180 is configured to transmit signals for driving the plurality of light emitting devices 140 from the control unit to the display area AA. The printed circuit board 180 may be connected to the COF 170 and electrically connected to the plurality of light-emitting devices 140 in the display area AA and various driving devices for driving the plurality of light-emitting devices 140.

The upper substrate 160 is a substrate that overlaps the lower substrate 110 to protect various components of the stretchable display device 100. The upper substrate 160 is a flexible substrate and may be made of an insulating material that can be bent or stretched. For example, the upper substrate 160 may be made of a flexible material and may be made of the same material as the lower substrate 110, but is not limited thereto.

The polarization layer 190 is a component that suppresses external light reflection of the stretchable display device 100 and may be disposed on the upper substrate 160 by overlapping with the upper substrate 160 . However, the present invention is not limited to this, and the polarization layer 190 may be disposed below the upper substrate 160 or may be omitted depending on the configuration of the stretchable display device 100.

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

Figure 2 is an enlarged plan view of a stretchable display device according to an embodiment of the present invention. Figure 3 is a schematic cross-sectional view of a sub-pixel and an additional sub-pixel of a stretchable display device according to an embodiment of the present invention.

Referring to FIGS. 2 and 3 , the lower substrate 110 includes a plurality of first areas A1 where a plurality of island substrates 111 are disposed, and a plurality of second regions where a plurality of connection wires 150 are disposed ( A2) and a plurality of first areas A1 and a plurality of second areas A2, and a plurality of third areas A3 in which a plurality of additional sub-pixels SPXA are defined.

The plurality of first areas A1 of the lower substrate 110 are areas where the plurality of island substrates 111 are disposed, and may be rigid areas. A plurality of first areas A1 are defined on the lower substrate 110 and spaced apart from each other. For example, the plurality of first areas A1 may be arranged in a matrix form on the lower substrate 110 as shown in FIG. 2, but is not limited thereto.

Referring to FIG. 2 , a plurality of pixels PX including a plurality of sub-pixels SPX are defined on the plurality of island substrates 111 in the plurality of first areas A1. A plurality of light-emitting elements 140 and various driving elements for driving the plurality of light-emitting elements 140 may be disposed in each of the plurality of sub-pixels (SPX), and each of the plurality of sub-pixels (SPX) may be connected to various wires. You can. For example, each of the plurality of sub-pixels (SPX) may be connected to various wiring such as a gate wiring, data wiring, high-potential power wiring, low-potential power wiring, reference voltage wiring, and common wiring (CL).

The lower substrate 110 is defined with a plurality of second areas A2 adjacent to the plurality of first areas A1. A plurality of second areas A2 are defined between two adjacent first areas A1. Accordingly, as shown in FIG. 2, a plurality of second areas A2 are defined above, below, to the left, and to the right of one first area A1. The plurality of second areas A2 is an area where a plurality of connection wires 150 and a plurality of connection substrates CS are disposed, and is a flexible area. A plurality of second areas A2 are defined on the lower substrate 110 and spaced apart from each other. For example, the plurality of second areas A2 may be arranged in a matrix form on the lower substrate 110 as shown in FIG. 2, but is not limited thereto.

A plurality of connection wires 150 and a plurality of connection substrates CS are disposed in the plurality of second areas A2 of the lower substrate 110 . The plurality of connection wires 150 are disposed on the plurality of connection substrates CS, and the plurality of connection wires 150 electrically connect pads on the plurality of island substrates 111. Specifically, the plurality of connection wires 150 may electrically connect pads disposed on neighboring island substrates 111 among the plurality of island substrates 111 . The plurality of connection wires 150 are disposed on the plurality of second areas A2 between the plurality of first areas A1 where the plurality of island substrates 111 are disposed, and form the pads of the plurality of island substrates 111. can be electrically connected.

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

In contrast, in the case of the stretchable display device 100 according to an embodiment of the present invention, the gate wire, data wire, high-potential power wire, low-potential power wire, reference voltage wire, and common wire (CL) are made of a metal material. ), etc. are disposed only on the plurality of island substrates 111. That is, in the stretchable display device 100 according to an embodiment of the present invention, various wires made of metal materials may be disposed only on the plurality of island substrates 111 and not in contact with the lower substrate 110. there is. Accordingly, various wires made of metallic materials may be patterned to correspond to the plurality of island substrates 111 and disposed discontinuously.

In the stretchable display device 100 according to an embodiment of the present invention, in order to connect the wires on the plurality of discontinuous island substrates 111, a plurality of connection wires are formed between two adjacent island substrates 111. (150) can be arranged. Specifically, the plurality of connection wires 150 are connected to each pad on two island substrates 111 adjacent to each other. And various wiring such as gate wiring, data wiring, high-potential power wiring, low-potential power wiring, reference voltage wiring, common wiring (CL), etc. on the two island boards 111 adjacent to each other by a plurality of connecting wirings 150. They can be electrically connected.

For example, gate wiring may be disposed on a plurality of island substrates 111 arranged adjacent to each other in the X-axis direction, and gate pads GP may be disposed at both ends of the gate wiring. At this time, each of the plurality of gate pads GP on the plurality of island substrates 111 arranged adjacent to each other in the X-axis direction may be connected to each other by a plurality of connection wires 150 functioning as gate wires. Accordingly, the gate wires arranged on the plurality of island substrates 111 in the first area A1 and the plurality of connection wires 150 arranged on the second area A2 may function as one gate wire. . In addition, all various wires that may be included in the stretchable display device 100, such as data wires, high-potential power wires, low-potential power wires, reference voltage wires, common wires (CL), etc., are also included as a plurality of connection wires as described above. It can function as one wiring by (150).

A plurality of connection wires 150 are disposed on a plurality of connection substrates CS. As described above with reference to FIG. 1 , the plurality of connection substrates CS have a curved shape. Therefore, the plurality of connection wires 150 disposed on the plurality of connection substrates CS may also have the same curved shape as the plurality of connection substrates CS.

The plurality of connection wires 150 may be made of a conductive material. The connection wiring 150 may be made of the same material as the various conductive components disposed on the plurality of island substrates, for example, may be made of a metal material, but is not limited thereto, and may be made of a base polymer and dispersed in the base polymer. It may also contain conductive particles.

Referring to FIG. 2 , the plurality of connection wires 150 includes a plurality of first connection wires 151 and a plurality of second connection wires 152.

The plurality of first connection wires 151 are wires extending in the X-axis direction among the plurality of connection wires 150. The plurality of first connection wires 151 may connect pads on two neighboring island substrates 111 among the plurality of island substrates 111 arranged adjacent to each other in the X-axis direction. The plurality of first connection wires 151 may function as gate wires or low-potential power wires, but are not limited thereto. For example, when the plurality of first connection wires 151 function as gate wires, gate pads GP on two island substrates 111 arranged side by side in the X-axis direction may be electrically connected.

The plurality of second connection wires 152 are wires extending in the Y-axis direction among the plurality of connection wires 150. The plurality of second connection wires 152 may connect pads on two adjacent island substrates 111 among the plurality of island substrates 111 arranged adjacent to each other in the Y-axis direction. The plurality of second connection wires 152 may function as data wires or high-potential power wires, but are not limited thereto. For example, when the plurality of second connection wires 152 function as data wires, data pads on two island boards 111 arranged side by side in the Y-axis direction can be electrically connected.

Referring to FIG. 2 , the lower substrate 110 has a plurality of third areas A3 defined in a portion surrounded by a plurality of first areas A1 and a plurality of second areas A2. It can be defined as a second area (A2) disposed on the upper, lower, right, and left sides of each of the plurality of third areas (A3), and a first area (A1) disposed adjacent to each of the plurality of third areas (A3) in four diagonal directions.

A plurality of additional pixels (PXA) including a plurality of additional sub-pixels (SPXA) are defined in the plurality of third areas (A3) of the lower substrate 110. A plurality of additional light-emitting devices 140A may be disposed in each of the plurality of additional sub-pixels SPXA, and each of the plurality of additional sub-pixels SPXA may be connected to a plurality of additional connection wires 150A.

A plurality of additional connection substrates (CSA) extending from the plurality of island substrates 111 to each of the plurality of additional sub-pixels (SPXA) are disposed. The plurality of additional connection substrates CSA may be arranged to extend from the first plurality of areas A1 toward the plurality of third areas A3. The plurality of additional connection substrates (CSA) are boards that connect the plurality of island substrates 111 and the plurality of additional sub-pixels (SPXA). The plurality of additional connection substrates (CSA) may be formed integrally with the plurality of island substrates 111, but the present invention is not limited thereto.

Meanwhile, referring to FIG. 3, a plurality of additional connection substrates (CSA) are disposed on the same plane as a plurality of connection substrates (CS). Since the plurality of additional connection substrates (CSA) are disposed on the same plane as the plurality of connection substrates (CS), the plurality of additional connection wirings 150A and the plurality of connection substrates (CS) on the plurality of additional connection substrates (CSA) A plurality of connection wires 150 may also be arranged on the same plane. Additionally, the plurality of additional connection substrates (CSA) and the plurality of connection substrates (CS) may be arranged to be spaced apart from each other without overlapping each other. If the plurality of additional connection substrates (CSA) and the plurality of connection substrates (CS) are in contact with each other, the plurality of additional connection wirings 150A on the plurality of additional connection substrates (CSA) and the plurality of connection wirings 150A on the plurality of connection substrates (CS) The connection wires 150 may also come into contact with each other, which may lead to reduced reliability of the stretchable display device 100. Accordingly, the plurality of additional connection substrates (CSA) and the plurality of connection substrates (CS) may be arranged to be spaced apart from each other on the same plane.

The plurality of additional connection substrates (CSA) have a curved shape. For example, the plurality of additional connection substrates (CSA) may have a sinusoidal shape like the plurality of connection substrates (CS). However, the shape of the plurality of additional connection substrates (CSA) is not limited thereto. For example, the plurality of additional connection substrates (CSA) may extend in a zigzag shape, or may have various shapes such as a plurality of diamond-shaped substrates connected and extending at the vertices.

A plurality of additional connection wires 150A are disposed on a plurality of additional connection boards (CSA). The plurality of additional connection wires 150A may electrically connect each of the plurality of additional sub-pixels SPXA and the plurality of sub-pixels SPX. For example, the plurality of additional connection wires 150A may electrically connect the driving elements of each of the plurality of sub-pixels SPX and the additional light-emitting elements 140A of the plurality of additional sub-pixels SPXA. The plurality of additional connection wires 150A may transmit the voltage of each of the plurality of sub-pixels SPX to each of the plurality of additional sub-pixels SPXA.

Each of the plurality of additional sub-pixels (SPXA) is disposed at an angle with respect to the direction in which the plurality of connection wires 150 extend. Additionally, the additional connection substrate (CSA) and the additional connection wiring (150A) extending from the plurality of island substrates (111) toward the plurality of additional sub-pixels (SPXA) may also be arranged at an angle with respect to the direction in which the plurality of connection wirings (150) extend. there is.

The third area A3 corresponding to the flexible area may be stretched when the stretchable display device 100 is stretched. Accordingly, external force due to stretching of the stretchable display device 100 may be applied to the plurality of additional connection wires 150A and the plurality of additional connection substrates CSA disposed on the third area A3. For example, when the stretchable display device 100 is stretched in the An external force may be applied to elongate in the X-axis direction. However, since the plurality of additional connection wires 150A and the plurality of additional connection boards (CSA) are arranged to have an inclination with respect to the X-axis direction, the plurality of additional connection wires 150A and the plurality of additional connection boards (CSA) The applied external force can be distributed. Additionally, when the stretchable display device 100 is stretched in the Y-axis direction along which the plurality of second connection wires 152 extend, the plurality of additional connection wires 150A and the plurality of additional connection substrates CSA have Y An external force may be applied to stretch in the axial direction. However, since the plurality of additional connection wires 150A and the plurality of additional connection boards (CSA) are arranged to have an inclination with respect to the Y-axis direction, the plurality of additional connection wires 150A and the plurality of additional connection boards (CSA) The applied external force can be distributed. That is, the plurality of additional connection wires 150A and the plurality of additional connection substrates CSA are arranged to have an inclination with respect to the X-axis direction and the Y-axis direction, so that when the stretchable display device 100 is stretched, a plurality of additional connection External force applied to the wiring 150A and the plurality of additional connection substrates CSA can be reduced, and damage to the plurality of additional connection wiring 150A and the plurality of additional connection substrates CSA can be reduced.

Hereinafter, the plurality of sub-pixels (SPX) and the plurality of additional sub-pixels (SPXA) will be described in more detail with reference to FIG. 3.

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

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

A first transistor 120 including a first gate electrode 122, a first active layer 121, a first source electrode 123, and a first drain electrode 124 is disposed on the buffer layer 112.

First, the first active layer 121 is disposed on the buffer layer 112. For example, the first active layer may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or organic semiconductor, etc. there is.

A gate insulating layer 113 is disposed on the first active layer 121. The gate insulating layer 113 is a layer for electrically insulating the first gate electrode 122 and the first active layer 121, and may be made of an insulating material. For example, the gate insulating layer 113 may be composed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multiple layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. It doesn't work.

A first gate electrode 122 is disposed on the buffer layer 112. The first gate electrode 122 is disposed to overlap the first active layer 121. The first gate electrode 122 is made of various metal materials, such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), and neodymium (Nd). , and copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

An interlayer insulating layer 114 is disposed on the first gate electrode 122. The interlayer insulating layer 114 is a layer for insulating the first gate electrode 122, the first source electrode 123, and the first drain electrode 124, and may be made of an inorganic material like the buffer layer 112. For example, the interlayer insulating layer 114 may be composed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multiple layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. It doesn't work.

A first source electrode 123 and a first drain electrode 124 respectively contacting the first active layer 121 are disposed on the interlayer insulating layer 114. The first source electrode 123 and the first drain electrode 124 are arranged to be spaced apart from each other on the same layer. The first source electrode 123 and the first drain electrode 124 may be electrically connected to the first active layer 121 by contacting the first active layer 121 . The first source electrode 123 and the first drain electrode 124 are made of various metal materials, such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), and nickel. It may be any one of (Ni), neodymium (Nd), and copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

The gate insulating layer 113 and the interlayer insulating layer 114 may be patterned and disposed only in areas that overlap the plurality of island substrates 111 . The gate insulating layer 113 and the interlayer insulating layer 114 may also be made of the same inorganic material as the buffer layer 112. Therefore, the gate insulating layer 113 and the interlayer insulating layer 114 may easily generate cracks or be damaged during the process of stretching the stretchable display device 100. Accordingly, the gate insulating layer 113 and the interlayer insulating layer 114 are not disposed in the area between the plurality of island substrates 111, but are patterned in the shape of the plurality of island substrates 111 to form the plurality of island substrates 111. It can only be placed on top.

In FIG. 3 , for convenience of explanation, only the first transistor 120, which is a driving transistor, is shown among various transistors that can be included in the stretchable display device 100. However, switching transistors, capacitors, etc. may also be included in the display device. Additionally, in this specification, the first transistor 120 is described as having a coplanar structure, but various transistors such as a staggered structure may also be used.

Referring to FIG. 3, a gate pad GP is disposed on the gate insulating layer 113. The gate pad (GP) is a pad for transmitting a gate signal to a plurality of sub-pixels (SPX). The gate pad GP may be made of the same material as the first gate electrode 122, but is not limited thereto.

The gate pad GP can transmit a gate signal from the connection wire 150, which functions as a gate wire, to a plurality of sub-pixels SPX. The gate pad (GP) is connected to the connection wire 150 and transmits the gate signal to the plurality of sub-pixels (SPX).

The connection wire 150 is arranged to extend from the top surface of the connection substrate CS to the side surfaces of the buffer layer 112, the gate insulation layer 113, and the interlayer insulation layer 114, and to the top surface of the interlayer insulation layer 114. Additionally, the connection wire 150 may be in contact with the gate pad GP through the contact hole of the interlayer insulating layer 114. Accordingly, the connection wire 150 is electrically connected to the gate pad GP and can transmit the gate signal to the gate pad GP.

A common wiring CL is disposed on the interlayer insulating layer 114. The common wiring CL is a wiring that applies a common voltage to the plurality of sub-pixels SPX. The common wiring CL may be made of the same material as the first source electrode 123 and the first drain electrode 124 of the first transistor 120, but is not limited thereto.

A planarization layer 115 is disposed on the first transistor 120, the common wiring CL, and the interlayer insulating layer 114. The planarization layer 115 planarizes the upper portion of the plurality of island substrates 111 including the first transistor 120 or the lower portion of the light emitting device 140 where the light emitting device 140 is disposed. The planarization layer 115 may be composed of a single layer or multiple layers, and may be made of an organic material. For example, the planarization layer 115 may be made of an acryl-based organic material, but is not limited thereto. The planarization layer 115 includes a contact hole for electrically connecting the first transistor 120 and the light emitting device 140, a contact hole for electrically connecting the gate pad (GP) and the connection pad, and a common wiring (CL) It may include a contact hole for electrically connecting the light emitting device 140.

In some embodiments, a passivation layer may be formed between the first transistor 120 and the planarization layer 115. That is, in order to protect the first transistor 120 from penetration of moisture and oxygen, a passivation layer may be formed to cover the first transistor 120. The passivation layer may be made of an inorganic material and may be made of a single layer or a double layer, but is not limited thereto.

The first pad 131 and the second pad 132 are disposed on the planarization layer 115.

The first pad 131 is an electrode that electrically connects the first transistor 120 and the light emitting device 140. The first pad 131 is disposed on the planarization layer 115 and can be in contact with the light emitting device 140, and the first pad 131 is connected to the first transistor 120 through a contact hole formed in the planarization layer 115. It may be in contact with the first drain electrode 124. Accordingly, the light emitting device 140 and the first drain electrode 124 of the first transistor 120 may be electrically connected by the first pad 131. However, depending on the type of the first transistor 120, the first pad 131 may be connected to the first source electrode 123 of the first transistor 120, but is not limited thereto.

The second pad 132 is an electrode that electrically connects the light emitting device 140 and the common wiring CL. The second pad 132 is disposed on the planarization layer 115 and can be in contact with the light emitting device 140, and the second pad 132 is connected to the common wiring CL through a contact hole formed in the planarization layer 115. You can access it. Accordingly, the light emitting device 140 and the common wiring CL may be electrically connected by the second pad 132.

A bank 116 is disposed on the first pad 131, the second pad 132, and the planarization layer 115. The bank 116 may be configured to include a black material to prevent the light emitted from the light emitting device 140 from being transmitted to the adjacent sub-pixel (SPX) and mixing colors. The bank 116 may be made of an organic insulating material and may be made of the same material as the planarization layer 115. For example, the bank 116 may be made of acryl-based resin, benzocyclobutene (BCB)-based resin, or polyimide, but is not limited thereto.

The light emitting device 140 is disposed on the first pad 131, the second pad 132, and the planarization layer 115. The light emitting element 140 is arranged to correspond to each of the plurality of sub-pixels (SPX) and is a component that emits light in a specific wavelength range. For example, the light-emitting device 140 may be a blue light-emitting device 140 that emits blue light, a red light-emitting device 140 that emits red light, or a green light-emitting device 140 that emits green light. Not limited.

The light emitting device 140 may be defined differently depending on the type of stretchable display device 100. When the stretchable display device 100 is an organic light emitting stretchable display device, the light emitting device 140 may be an organic light emitting device 140 including an anode, an organic light emitting layer 142, and a cathode. When the stretchable display device 100 is an inorganic light-emitting stretchable display device, the light emitting element 140 is an LED (Light Emitting Diode) including an n-type semiconductor layer, a light emitting layer 142, and a p-type semiconductor layer, especially It may be a micro LED (Micro Light Emitting Diode). Hereinafter, the light-emitting device 140 will be described assuming that it is a micro LED made of an inorganic light-emitting material, but is not limited thereto and may be used as a light-emitting device 140 made of an organic light-emitting material.

The light emitting device 140 includes a first semiconductor layer 141, a light emitting layer 142, a second semiconductor layer 143, a first electrode 144, and a second electrode 145. Hereinafter, for convenience of explanation, it is assumed that the light emitting device 140 is a micro LED with a flip chip structure. However, the light emitting device 140 is a micro LED with a lateral structure or a vertical structure. It may be, but is not limited to this.

The first electrode 144 is disposed on the first pad 131, and the second electrode 145 is disposed on the second pad 132. Each of the first electrode 144 and the second electrode 145 is electrically connected to the first pad 131 and the second pad 132. The first electrode 144 may transmit the voltage from the drain electrode of the first transistor 120 to the first semiconductor layer 141, and the second electrode 145 may transmit the voltage from the common wiring CL to the second semiconductor layer 141. It can be transferred to the semiconductor layer 143.

Meanwhile, a plurality of connection patterns BP are disposed between the first pad 131 and the second pad 132 and the light emitting device 140. The plurality of connection patterns BP are a medium for bonding the plurality of light emitting devices 140 to the first pad 131 and the second pad 132. For example, the plurality of connection patterns BP may be gold (Au) bumps or solder bumps, but are not limited thereto.

The plurality of connection patterns BP includes a first connection pattern BP1 and a second connection pattern BP2. A first connection pattern (BP1) is disposed between the first pad 131 and the first electrode 144, and a second connection pattern (BP2) is disposed between the second pad 132 and the second electrode 145. do. The plurality of light emitting devices 140 are connected through a plurality of connection patterns BP disposed between the first electrode 144 and the first pad 131 and between the second electrode 145 and the second pad 132. It may be bonded on a plurality of island substrates 111. In addition, among the plurality of connection patterns BP, the second connection pattern BP2 disposed between the second electrode 145 and the second pad 132 is connected to the second electrode 145 and the second pad 132 of the light emitting device 140. The step between the pads 132 can be compensated.

A first semiconductor layer 141 is disposed on the first electrode 144, and a second semiconductor layer 143 is disposed on the first semiconductor layer 141. The first semiconductor layer 141 and the second semiconductor layer 143 may be formed by implanting n-type or p-type impurities into gallium nitride (GaN). For example, the first semiconductor layer 141 is a p-type semiconductor layer formed by implanting a p-type impurity into gallium nitride, and the second semiconductor layer 143 is an n-type semiconductor layer formed by implanting an n-type impurity into gallium nitride. It may be a semiconductor layer, but is not limited thereto. The p-type impurities may be magnesium (Mg), zinc (Zn), beryllium (Be), etc., and the n-type impurities may be silicon (Si), germanium (Ge), tin (Sn), etc., but are not limited thereto. No.

The light emitting layer 142 is disposed between the first semiconductor layer 141 and the second semiconductor layer 143. The light emitting layer 142 may emit light by receiving holes and electrons from the first semiconductor layer 141 and the second semiconductor layer 143. The light-emitting layer 142 may have a single-layer or multi-quantum well (MQW) structure. For example, the light emitting layer 142 may be made of indium gallium nitride (InGaN) or gallium nitride (GaN), but is not limited thereto.

Meanwhile, a portion of the second semiconductor layer 143 protrudes to the outside of the light emitting layer 142 and the first semiconductor layer 141. In other words, the light emitting layer 142 and the first semiconductor layer 141 may be smaller than the second semiconductor layer 143 to expose the lower surface of the second semiconductor layer 143. The second semiconductor layer 143 may be exposed from the light emitting layer 142 and the first semiconductor layer 141 to be electrically connected to the second pad 132.

Referring to FIG. 3 , an additional connection board (CSA) extending from the first area (A1) to the third area (A3) of the lower board 110 and an additional connection wire 150A are disposed on the lower board 110. do. The additional connection wire 150A may be formed integrally with the first drain electrode 124 of the first transistor 120 of the island substrate 111. The additional connection wire 150A may be arranged to extend from the first drain electrode 124 on the first area A1 of the lower substrate 110 to the third area A3. Accordingly, the additional connection wire 150A may be electrically connected to the first drain electrode 124 of the first transistor 120 of the lower substrate 110, and the voltage from the first drain electrode 124 may be applied to the additional connection wire. It can be transmitted to an additional light-emitting element (140A) connected to (150A). However, the present invention is not limited thereto, and the additional connection wire 150A may be disposed on a different layer from the first drain electrode 124 of the first transistor 120 and may be made of a different material. For example, the additional connection wire 150A may be made of the same material on the same layer as the first pad 131 and the first gate electrode 122.

A plurality of piezoelectric patterns PP are disposed in the third area A3 of the lower substrate 110 . Specifically, a plurality of piezoelectric patterns (PP) are disposed adjacent to the end of the additional connection substrate (CSA). The lower substrate 110 has a plurality of grooves arranged in the plurality of third areas A3, and a plurality of piezoelectric patterns PP are arranged in the plurality of grooves.

If a plurality of piezoelectric patterns PP are disposed on the upper surface of the lower substrate 110, when the stretchable display device 100 is stretched, stress is applied to the plurality of piezoelectric patterns PP, causing the plurality of piezoelectric patterns (PP) PP) may break, peel, or scatter. Accordingly, by disposing the plurality of piezoelectric patterns PP in the plurality of grooves, cracking, peeling, and scattering of the plurality of piezoelectric patterns PP can be minimized when the stretchable display device 100 is stretched.

A plurality of piezoelectric patterns (PP) are devices that convert mechanical energy into electrical energy. For example, when an external force, that is, stress, is applied to the plurality of piezoelectric patterns PP, voltage may be generated from the plurality of piezoelectric patterns PP.

Meanwhile, the plurality of piezoelectric patterns PP are disposed in the groove of the lower substrate 110 in the third area A3 corresponding to the flexible region, so that when the stretchable display device 100 is stretched, the lower substrate 110 and An external force may be applied to the plurality of piezoelectric patterns PP mounted on the lower substrate 110. Additionally, when an external force, that is, mechanical energy, due to stretching of the stretchable display device 100 is applied to the plurality of piezoelectric patterns PP, electrical energy may be generated from the plurality of piezoelectric patterns PP. Accordingly, when the stretchable display device 100 is stretched, external force due to stretching, that is, stress, may be applied to the plurality of piezoelectric patterns PP, thereby generating voltage.

When stress is applied to a plurality of piezoelectric patterns (PP), the voltage generated from the plurality of piezoelectric patterns (PP) temporarily has a maximum value immediately after the stress is applied, and then a voltage drop occurs and converges to a specific voltage. . For example, when stress is applied to the plurality of piezoelectric patterns PP, a maximum voltage may be instantly generated from the plurality of piezoelectric patterns PP. And after the maximum voltage is generated, a voltage drop occurs and the voltage value generated from the plurality of piezoelectric patterns (PP) may drastically decrease. However, the voltage value generated from the plurality of piezoelectric patterns PP may not continue to decrease but may converge to a specific voltage value. At this time, a specific voltage value that finally converges from the plurality of piezoelectric patterns PP may be defined as the first voltage. Accordingly, when stress is applied to the plurality of piezoelectric patterns PP, a first voltage may be generated from the plurality of piezoelectric patterns PP.

When the stress applied from the plurality of piezoelectric patterns (PP) is removed, the voltage generated from the plurality of piezoelectric patterns (PP) has a maximum value of opposite polarity to the maximum value that occurred when the stress was applied immediately after the stress is removed. Afterwards, it may be in a floating state. For example, when the stress applied to the plurality of piezoelectric patterns PP is removed, the maximum voltage may be instantly generated from the plurality of piezoelectric patterns PP. The maximum voltage generated at this time may have an opposite polarity to the maximum voltage generated immediately after stress is applied to the plurality of piezoelectric patterns PP. And the plurality of piezoelectric patterns (PP) can be floated. Accordingly, if stress is not applied to the plurality of piezoelectric patterns PP, the plurality of piezoelectric patterns PP may float.

In summary, when the stretchable display device 100 is not stretched, mechanical energy, that is, stress, is not applied to the plurality of piezoelectric patterns PP, so the plurality of piezoelectric patterns PP can float. Also, when the stretchable display device 100 is stretched, mechanical energy, that is, stress, is applied to the plurality of piezoelectric patterns PP, so that the plurality of piezoelectric patterns PP may generate a first voltage.

Meanwhile, the maximum voltage generated from the plurality of piezoelectric patterns PP may be proportional to the size of the plurality of piezoelectric patterns PP. For example, when the length of the plurality of piezoelectric patterns PP is about 2 cm, the maximum voltage generated from the plurality of piezoelectric patterns PP may be about 8V. In addition, the length of the plurality of additional light-emitting elements 140A disposed on the plurality of piezoelectric patterns PP is about 500 um, and the length of the plurality of piezoelectric patterns PP is adjusted to correspond to the length of the plurality of additional light-emitting elements 140A. When set, the maximum voltage generated from the plurality of piezoelectric patterns PP may be about 0.2V. Specifically, when a plurality of piezoelectric patterns (PP) have a length of 2cm, the maximum voltage is 8V, and when a plurality of piezoelectric patterns (PP) have a length of 500um, the maximum voltage also has a value of about 0.2V in proportion to the length. You can have it. Accordingly, the maximum voltage of the plurality of piezoelectric patterns PP is about 0.2V, and the first voltage is also 0V as described above, so the difference between the maximum voltage and the first voltage may be small. Therefore, the plurality of additional light emitting elements 140A do not emit light only when the first voltage occurs in the plurality of piezoelectric patterns PP, but rather the period from the maximum voltage to convergence to the first voltage in the plurality of piezoelectric patterns PP. Even during this time, a plurality of additional light emitting devices 140A may emit light. That is, after the stretchable display device 100 is stretched, the plurality of additional light-emitting devices 140A do not emit light late, but the plurality of additional light-emitting devices 140A emit light simultaneously with the stretching of the stretchable display device 100. may emit light, and the plurality of additional light-emitting devices 140A may compensate for a decrease in luminance when the stretchable display device 100 is stretched without delay.

An additional light emitting device 140A is disposed in the third area A3 of the lower substrate 110. An additional light emitting element 140A is disposed on the additional connection substrate CSA, the additional connection wiring 150A, and the plurality of piezoelectric patterns PP. The additional light-emitting device 140A is disposed to correspond to each of the plurality of additional sub-pixels (SPXA) and is a component that emits light in a specific wavelength range. The light-emitting device 140 is disposed in each of the plurality of sub-pixels (SPX). may be substantially the same as

The additional light-emitting device 140A includes a first additional semiconductor layer 141A, an additional light-emitting layer 142A, a second additional semiconductor layer 143A, a first additional electrode (A and B), and a second additional electrode 145A. .

A first additional electrode 144A is disposed on one end of the additional connection wiring 150A, and a second additional electrode 145A is disposed on the plurality of piezoelectric patterns PP. Each of the first additional electrode 144A and the second additional electrode 145A is electrically connected to a plurality of additional connection wires 150A and a plurality of piezoelectric patterns PP. The first additional electrode 144A may transfer voltage from the drain electrode of the first transistor 120 to the first additional semiconductor layer 141A, and the second additional electrode 145A may be used to apply voltage to the piezoelectric pattern PP. In this case, the first voltage from the piezoelectric pattern PP may be transmitted to the second additional semiconductor layer 143A.

Meanwhile, a plurality of additional connection patterns BPA are disposed between the first additional electrode 144A and the additional connection wiring 150A and between the second additional electrode 145A and the piezoelectric pattern PP. The plurality of additional connection patterns (BPA) are a medium for bonding the plurality of additional light-emitting elements (140A) to the plurality of additional connection wires (150A) and the plurality of piezoelectric patterns (PP). For example, the plurality of additional connection patterns (BPA) may be gold (Au) bumps or solder bumps, but are not limited thereto.

The plurality of additional connection patterns (BPA) includes a first additional connection pattern (BP1A) and a second additional connection pattern (BP2A). A first additional connection pattern (BP1A) is disposed between the additional connection wire (150A) and the first additional electrode (144A), and a second additional connection pattern (BP2A) is disposed between the piezoelectric pattern (PP) and the second additional electrode (145A). ) is placed. The plurality of additional light emitting devices 140A may be bonded to the third area A3 of the lower substrate 110 via a plurality of additional connection patterns BPA. In addition, the second additional connection pattern BP2A may compensate for the step between the second additional electrode 145A and the piezoelectric pattern PP.

Meanwhile, in the case of the second additional connection pattern (BP2A) disposed between the second additional electrode (145A) and the piezoelectric pattern (PP) among the plurality of additional connection patterns (BPA), the piezoelectric pattern (PP) and the second additional electrode ( 145A), and may further include the same material as the piezoelectric pattern PP to supply voltage to a plurality of additional light emitting elements 140A when stress is applied.

A first additional semiconductor layer 141A is disposed on the first additional electrode 144A, and a second additional semiconductor layer 143A is disposed on the first additional semiconductor layer 141A. The first additional semiconductor layer 141A and the second additional semiconductor layer 143A may be formed by implanting n-type or p-type impurities into gallium nitride (GaN). For example, the first additional semiconductor layer 141A is a p-type semiconductor layer formed by implanting p-type impurities into gallium nitride, and the second additional semiconductor layer 143A is formed by implanting n-type impurities into gallium nitride. It may be an n-type semiconductor layer, but is not limited thereto. The p-type impurities may be magnesium (Mg), zinc (Zn), beryllium (Be), etc., and the n-type impurities may be silicon (Si), germanium (Ge), tin (Sn), etc., but are not limited thereto. No.

An additional light emitting layer 142A is disposed between the first additional semiconductor layer 141A and the second additional semiconductor layer 143A. The additional light emitting layer 142A may emit light by receiving holes and electrons from the first additional semiconductor layer 141A and the second additional semiconductor layer 143A. The additional light-emitting layer 142A may have a single-layer or multi-quantum well (MQW) structure. For example, the additional light emitting layer 142A may be made of indium gallium nitride (InGaN) or gallium nitride (GaN), but is not limited thereto.

Meanwhile, a portion of the second additional semiconductor layer 143A protrudes to the outside of the additional light emitting layer 142A and the first additional semiconductor layer 141A. In other words, the additional light emitting layer 142A and the first additional semiconductor layer 141A may be smaller than the second additional semiconductor layer 143A so as to expose the lower surface of the second additional semiconductor layer 143A. The second additional semiconductor layer 143A may be exposed from the additional light-emitting layer 142A and the first additional semiconductor layer 141A to be electrically connected to the piezoelectric pattern PP.

Meanwhile, when the stretchable display device 100 is turned on, the plurality of light emitting devices 140 on the plurality of island substrates 111 may be turned on. Specifically, voltages at different levels may be applied to each of the first drain electrode 124 and the common wiring CL of the first transistor 120 that is electrically connected to the plurality of light emitting devices 140. Additionally, a voltage from the first drain electrode 124 of the first transistor 120 may be applied to the first electrode 144 of the light emitting device 140, and a voltage from the common wiring CL may be applied to the second electrode 145. A common voltage of may be applied. And as voltages of different levels are applied to the first electrode 144 and the second electrode 145 of the light emitting device 140, current flows to the light emitting layer 142 and the light emitting device 140 can emit light.

Meanwhile, the first drain electrode 124 of the first transistor 120 connected to each of the plurality of light emitting devices 140 on the plurality of island substrates 111 in the first area A1 is diagonally aligned with the first area A1. may also be electrically connected to each of the plurality of additional light emitting devices 140A on the adjacent third area A3. The plurality of light emitting devices 140 on the plurality of island substrates 111 and the plurality of additional light emitting devices 140A in the third area A3 are electrically connected to the first drain electrode 124 of the same first transistor 120. can be connected That is, one light-emitting device 140 and one additional light-emitting device 140A may be electrically connected to the first drain electrode 124 of one first transistor 120 at the same time. Therefore, in order to cause one light-emitting device 140 to emit light, when the voltage from the first drain electrode 124 of the first transistor 120 is applied to the first electrode 144 of one light-emitting device 140 , the same voltage may be simultaneously applied to the first additional electrode 144A of one additional light emitting device 140A.

However, in the case of the additional light-emitting device 140A, even if the voltage from the first drain electrode 124 is applied to the first additional electrode 144A, the additional light-emitting device 140A can be driven on the second additional electrode 145A. Only when a certain voltage is applied, current flows to the additional light-emitting layer 142A so that the additional light-emitting device 140A can emit light.

The second additional electrode 145A of the additional light emitting element 140A is electrically connected to each of the plurality of piezoelectric patterns PP as described above. When an external force due to stretching of the stretchable display device 100 is applied to the plurality of piezoelectric patterns PP, the plurality of piezoelectric patterns PP may generate a first voltage. Accordingly, when the light-emitting device 140 corresponding to one additional light-emitting device 140A emits light, the stretchable display device 100 is stretched and a first voltage is generated from the piezoelectric pattern PP, one The additional light emitting element 140A may also emit light together with one light emitting element 140. Accordingly, when the stretchable display device 100 is stretched, the additional light-emitting devices 140A corresponding to some of the light-emitting devices 140 among the plurality of light-emitting devices 140 may also emit light.

At this time, the first voltage generated from the piezoelectric pattern PP may be a voltage of a different level than the voltage from the first drain electrode 124. For example, the first voltage may be 0V, but is not limited thereto. .

Referring to FIG. 3, the upper substrate 160 is disposed on the lower substrate 110. Specifically, the upper substrate 160 is disposed on the plurality of light-emitting devices 140 and the plurality of additional light-emitting devices 140A of the lower substrate 110. The upper substrate 160 is a substrate that supports various components disposed below the upper substrate 160. The upper substrate 160 is a flexible substrate and may be made of an insulating material that can be bent or stretched. The upper substrate 160 is a flexible substrate and can be reversibly expanded and contracted. Additionally, the elastic modulus may be several MPa to hundreds of MPa, and the elongation failure rate may be 100% or more. The thickness of the upper substrate 160 may be 10um to 1mm, but is not limited thereto.

The upper substrate 160 may be made of the same material as the lower substrate 110, for example, silicone rubber such as polydimethylsiloxane (PDMS), or elastic material such as polyurethane (PU). It is made of a polymer (elastomer), and therefore can have flexible properties. However, the material of the upper substrate 160 is not limited thereto.

Pressure is applied to the upper substrate 160 and the lower substrate 110 so that the upper substrate 160 and the lower substrate 110 can be bonded by the adhesive layer 117 disposed below the upper substrate 160. The adhesive layer 117 may have flexible properties so that it expands or contracts as the upper substrate 160 expands or contracts. However, the present invention is not limited to this, and the adhesive layer 117 may be omitted depending on the embodiment.

A polarizing layer 190 is disposed on the upper substrate 160. The polarization layer 190 may polarize light incident from the outside of the stretchable display device 100. Polarized light that passes through the polarization layer 190 and is incident on the inside of the stretchable display device 100 may be reflected inside the stretchable display device 100, and thus its phase may be switched. Phase-converted light may not pass through the polarization layer 190. Accordingly, the light incident from the outside of the stretchable display device 100 into the inside of the stretchable display device 100 is not emitted again to the outside of the stretchable display device 100, so that the stretchable display device 100 )'s external light reflection can be reduced.

The stretchable display device 100 according to an embodiment of the present invention is a dummy portion of the lower substrate 110 that does not have any function, that is, a plurality of first regions where a plurality of island substrates 111 are disposed ( By arranging the additional pixels PXA in the plurality of third areas A3, which are areas excluding the plurality of second areas A2 where the plurality of connection wires 150 are disposed, the stretchable display device efficiently By utilizing the area of 100, the aperture ratio of the stretchable display device 100 can be improved. For example, as shown in FIG. 2 , when additional pixels (PXA) are placed in the stretchable display device 100, the aperture ratio may increase. Accordingly, the luminance of the stretchable display device 100 according to an embodiment of the present invention may also be improved.

In the stretchable display device 100 according to an embodiment of the present invention, the pixel PX and the additional pixel PXA share the first transistor 120 disposed on the plurality of island substrates 111 to create additional pixels. (PXA) can be operated easily. In a situation where the first transistor 120 is driven and the light-emitting device 140 emits light, an additional light-emitting device 140A connected to the same first transistor 120 is simultaneously activated depending on whether the stretchable display device 100 is stretched. It can emit light. Accordingly, in the stretchable display device 100 according to an embodiment of the present invention, the light-emitting device 140 and the additional light-emitting device 140A are formed by one first transistor 120 disposed on the plurality of island substrates 111. ), a plurality of additional light emitting devices 140A can easily emit light without adding a separate circuit part, and the aperture ratio of the stretchable display device 100 can be improved.

In addition, in the stretchable display device 100 according to an embodiment of the present invention, additional pixels PXA are formed in the plurality of third areas A3, so that the stretchable display device 100 is stretched. Deterioration in image quality and grid feeling of the relatable display device 100 can be minimized. Specifically, the voltage from the first drain electrode 124 of the first transistor 120 is applied to the first additional electrode 144A of the additional light emitting device 140A, but the piezoelectric pattern PP is in a floating state. A separate voltage may not be applied to the second additional electrode 145A. Accordingly, when the stretchable display device 100 is not stretched and the distance between the plurality of island substrates 111 is minimal, the additional light emitting elements 140A between the plurality of island substrates 111 do not emit light, and the plurality of island substrates 111 do not emit light. Only the plurality of light emitting devices 140 on the island substrate 111 may emit light. On the other hand, since the area between the plurality of island substrates 111 is stretched when the stretchable display device 100 is stretched, the gap between the plurality of island substrates 111 may increase compared to before stretching. Accordingly, when the stretchable display device 100 is stretched, grid-shaped spots may be visible due to a decrease in luminance in the area between the plurality of island substrates 111, and a problem of deterioration of image quality may occur. Accordingly, the stretchable display device 100 according to an embodiment of the present invention includes a light emitting device 140 connected to the same first transistor 120 and an additional light emitting device when the stretchable display device 100 is stretched. (140A) Both can be driven simultaneously. Specifically, when one light-emitting device 140 is driven by the first transistor 120 when the stretchable display device 100 is stretched, the second light-emitting device 140A connected to the same first transistor 120 1 The voltage from the first drain electrode 124 of the first transistor 120 is applied to the additional electrode 144A, and the first voltage generated in the piezoelectric pattern PP due to stress is applied to the second additional electrode 145A. Voltage may be applied. Accordingly, when the stretchable display device 100 is stretched and the distance between the plurality of island substrates 111 increases, the additional light emitting element 140A between the plurality of island substrates 111 emits light, thereby emitting a plurality of light. The decrease in luminance that occurs as the distance between elements 140 increases can be compensated for. That is, when the stretchable display device 100 is stretched, the additional light-emitting device 140A compensates for the gap between the light-emitting elements 140 that become distant, so that the gap between the light-emitting elements 140 appears to be constant. . Therefore, in the stretchable display device 100 according to an embodiment of the present invention, it is possible to minimize screen distortion and grid-like appearance when the stretchable display device 100 is stretched.

Figure 4 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. Figure 5 is a schematic cross-sectional view of a sub-pixel and an additional sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 400 of FIGS. 4 and 5 has an additional connection wire 450A that is different from the stretchable display device 100 shown in FIGS. 1 to 3 and an additional insulating layer 418. and an additional wiring LL, so that redundant description thereof will be omitted.

Referring to FIGS. 4 and 5 , an additional wiring LL is disposed on the interlayer insulating layer 114 . The additional wiring LL may be made of the same material as the first source electrode 123 and the first drain electrode 124 of the first transistor 120, but is not limited thereto.

The additional wiring LL is disposed on the plurality of island substrates 111 and can transmit various signals to the plurality of sub-pixels SPX. The additional wiring LL may be, for example, a gate wiring, a data wiring, a high-potential power wiring, a low-potential power wiring, a reference voltage wiring, a common wiring (CL), etc., but is not limited thereto.

An additional insulating layer 418 covering the additional wiring LL is disposed on the additional wiring LL. The additional insulating layer 418 may be disposed to cover the first drain electrode 124 and the additional wiring LL. Additionally, the additional insulating layer 418 may extend to the outside of the plurality of island substrates 111 to cover the additional connection substrate (CSA). The additional insulating layer 418 may include a contact hole for electrically connecting the first drain electrode 124 of the first transistor 120 and the additional connection wire 450A.

The additional insulating layer 418 may be made of an insulating material, and since the additional insulating layer 418 is extended and disposed on the additional connection substrate (CSA) of the third area (A3), which is a flexible area, it may be made of a flexible insulating material. It can be done. For example, the additional insulating layer 418 may be made of the same material as the plurality of island substrates 111 and the plurality of additional connection substrates (CSA), but is not limited thereto.

Meanwhile, in FIG. 5 , the additional insulating layer 418 is shown extending to the outside of the plurality of island substrates 111, but the additional insulating layer 418 may be disposed only on the plurality of island substrates 111. . In this case, the additional insulating layer 418 may be composed of a single layer of silicon nitride (SiNx) or silicon oxide (SiOx), which are inorganic insulating materials, or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx). It is not limited to this.

An additional connection wire 450A is disposed on the additional insulating layer 418. The additional connection wiring 450A is disposed on the upper surface of the additional insulating layer 418 and extends from the plurality of island substrates 111 toward the third area A3. The additional connection wire 450A may be in contact with the first drain electrode 124 through a contact hole in the additional insulating layer 418, so that the additional connection wire 450A may be electrically connected to the first drain electrode 124. And one end of the additional connection wire 450A extending toward the third area A3 is connected to the first additional electrode 144A of the additional light emitting device 140A of the third area A3 through a plurality of additional connection patterns BPA. can be electrically connected to. Accordingly, the additional connection wire 450A transmits the voltage from the first drain electrode 124 of the first transistor 120 on the plurality of island substrates 111 to the additional light emitting device 140A in the third area A3. You can.

The stretchable display device 400 according to another embodiment of the present invention includes various wires arranged on the island substrate 111 and an additional connection wire 450A extending from the island substrate 111 toward the third area A3. ) can be placed between the additional insulating layers 418 to prevent short circuits between various wires and the additional connection wire 450A. Various wirings made of metal materials are disposed only on the plurality of island substrates 111. For example, various wiring such as gate wiring, data wiring, high potential power wiring, low potential power wiring, reference voltage wiring, common wiring (CL), etc. may be disposed only on the plurality of island substrates 111. And the plurality of additional connection wires 450A are electrically connected to the first drain electrode 124 of the first transistor 120 on the plurality of island substrates 111, and the first transistor 120 is connected to the additional light emitting device 140A. ) can transmit voltage from. At this time, among the various wirings of the island substrate 111, a wiring disposed on the same plane as the first drain electrode 124 of the first transistor 120 may be disposed. For example, the first drain electrode 124 and the additional wiring LL may be disposed on the same plane. Accordingly, an additional insulating layer 418 covering the additional wiring LL is formed to prevent the additional wiring LL from contacting the additional connection wiring 450A extending from the first drain electrode 124 to the outside of the island substrate 111. More can be placed. The additional insulating layer 418 is disposed from the island substrate 111 to the additional connection substrate (CSA) and extends from the first drain electrode 124 to the outside of the island substrate 111 to connect the additional connection wire 450A to the island. It can be insulated from various wiring on the substrate 111. The additional insulating layer 418 may be made of an insulating material, for example, the same material as the plurality of island substrates 111 and the plurality of additional connection substrates (CSA). Accordingly, the stretchable display device 400 according to another embodiment of the present invention includes various wirings on the plurality of island substrates 111 and additional connections extending from the plurality of island substrates 111 to the third area A3. By insulating the wiring 450A, the reliability of the stretchable display device 400 can be improved.

Figure 6 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. Figure 7 is a schematic cross-sectional view of a sub-pixel and an additional sub-pixel of a stretchable display device according to another embodiment of the present invention. The stretchable display device 600 of FIGS. 6 and 7 is substantially the same as the stretchable display device 100 shown in FIGS. 1 to 3 except that it further includes a second transistor 620. However, duplicate explanations will be omitted.

Referring to FIGS. 6 and 7 , a plurality of second transistors 620 are disposed on a plurality of island substrates 111 . Each of the plurality of second transistors 620 includes a second active layer 621, a second gate electrode 622, a second source electrode 623, and a second drain electrode 624.

First, the second active layer 621 is disposed on the buffer layer 112. For example, the second active layer may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or organic semiconductor, etc. there is.

A gate insulating layer 113 is disposed on the second active layer 621. The gate insulating layer 113 is a layer for electrically insulating the second gate electrode 622 and the second active layer 621, and may be made of an insulating material. For example, the gate insulating layer 113 may be composed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multiple layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. It doesn't work.

A second gate electrode 622 is disposed on the buffer layer 112. The second gate electrode 622 is disposed to overlap the second active layer 621. The second gate electrode 622 is made of various metal materials, such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), and neodymium (Nd). , and copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

An interlayer insulating layer 114 is disposed on the second gate electrode 622. The interlayer insulating layer 114 is a layer for insulating the second gate electrode 622, the second source electrode 623, and the second drain electrode 624, and may be made of an inorganic material like the buffer layer 112. For example, the interlayer insulating layer 114 may be composed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multiple layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. It doesn't work.

A second source electrode 623 and a second drain electrode 624 are disposed on the interlayer insulating layer 114, respectively, in contact with the second active layer 621. The second source electrode 623 and the second drain electrode 624 are arranged to be spaced apart from each other on the same layer. The second source electrode 623 and the second drain electrode 624 may be electrically connected to the second active layer 621 by contacting the second active layer 621. The second source electrode 623 and the second drain electrode 624 are made of various metal materials, such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), and nickel. It may be any one of (Ni), neodymium (Nd), and copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

An additional connection substrate (CSA) and an additional connection wire 150A extending from the island substrate 111 of the first area A1 to the third area A3 are disposed on the lower substrate 110. The additional connection wire 150A may be arranged to extend from the second drain electrode 624 of the second transistor 620 on the island substrate 111 to the third area A3. The additional connection wire 150A may be integrated with the second drain electrode 624 and extended to the third area A3. Accordingly, the additional connection wire 150A may be electrically connected to the second drain electrode 624 of the second transistor 620, and the voltage from the second drain electrode 624 may be applied to the additional connection wire 150A. It can be transmitted to the light emitting device (140A).

Meanwhile, the first transistor 120 and the second transistor 620 may operate individually. For example, voltages from different wiring may be applied to the first source electrode 123 of the first transistor 120 and the second source electrode 623 of the second transistor 620. And, a voltage may be applied to the first drain electrode 124 and the first electrode 144 of the light emitting device 140 by the voltage applied to the first source electrode 123, and to the second source electrode 623. The voltage may be applied to the second drain electrode 624 and the first additional electrode 144A of the additional light emitting device 140A by the applied voltage. At this time, the common voltage from the second electrode 145 of the light emitting device 140 and the first voltage from the second additional electrode 145A of the additional light emitting device 140A may each have a fixed value. Accordingly, the voltage applied to the first source electrode 123 of the first transistor 120 and the second source electrode 523 of the second transistor 620 is adjusted to control the light emitting device 140 and the additional light emitting device 140A. The brightness of the light emitted from each can be adjusted.

The additional sub-pixel (SPXA) of the stretchable display device 600 according to another embodiment of the present invention may be driven independently from the sub-pixels (SPX) disposed on the plurality of island substrates 111. Specifically, the light emitting device 140 on the plurality of island substrates 111 is electrically connected to the first drain electrode 124 of the first transistor 120 to receive the voltage from the first drain electrode 124. You can. Therefore, the light emitting devices 140 on the plurality of island substrates 111 can be driven by receiving voltage from the first transistor 120, and the additional light emitting devices 140A on the plurality of third areas A3 can be driven by receiving voltage from the first transistor 120. It can be driven by receiving voltage from the transistor 620. Accordingly, the stretchable display device 600 according to another embodiment of the present invention can increase resolution by independently driving the sub-pixel (SPX) and the additional sub-pixel (SPXA), and is a stretchable display device. When stretching 600, the quality of the displayed image can be improved by selectively driving the additional sub-pixel (SPXA).

The stretchable display device 600 according to another embodiment of the present invention can reduce the luminance difference between the plurality of additional sub-pixels (SPXA) and the plurality of sub-pixels (SPX). First, the first voltage applied to the second additional electrode 145A of the additional light-emitting device 140A and the common voltage applied to the second electrode 145 of the light-emitting device 140 may be the same or have different values. You can have If there is a potential difference between the first voltage and the common voltage, and the same voltage is applied to the first transistor 120 and the second transistor 620, the luminance difference between the light-emitting device 140 and the additional light-emitting device 140A It can happen. Accordingly, in the stretchable display device 600 according to another embodiment of the present invention, the voltage applied to the first transistor 120 and the second transistor 620 is adjusted even if a difference occurs between the first voltage and the common voltage. As a result, the luminance deviation of the light-emitting device 140 and the additional light-emitting device 140A can be reduced. Specifically, while the common voltage applied to the second electrode 145 of the light-emitting device 140 is fixed, the voltage from the first transistor 120 applied to the first electrode 144 of the light-emitting device 140 By adjusting , the potential difference between the first electrode 144 and the second electrode 145 can be adjusted, and the brightness of the light emitted from the light emitting device 140 can be adjusted. And while the first voltage applied to the second additional electrode 145A of the additional light-emitting device 140A is fixed, the second transistor 620 is applied to the first additional electrode 144A of the additional light-emitting device 140A. By adjusting the voltage from the first additional electrode 144A and the second additional electrode 145A, the potential difference can be adjusted, and the brightness of the light emitted from the additional light emitting device 140A can be adjusted. Therefore, in the stretchable display device 600 according to another embodiment of the present invention, the first transistor 120 and the second transistor 620 are individually driven to generate the light emitting device 140 and the additional light emitting device 140A. The luminance deviation between the two can be minimized.

Figure 8 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. Figure 9 is a schematic cross-sectional view of an additional sub-pixel of a stretchable display device according to another embodiment of the present invention. 10A and 10B are schematic process diagrams of a stretchable display device according to another embodiment of the present invention. 11A and 11B are schematic plan views of additional sub-pixels according to another embodiment of the present invention. The stretchable display device 800 of FIGS. 8 to 11B is substantially the same as the stretchable display device 100 shown in FIGS. 1 to 3 except that it further includes a reinforcement layer 916. However, duplicate explanations will be omitted.

FIG. 9 is a cross-sectional view taken along region I-I' of the stretchable display device 800 shown in FIG. 8. When the stretchable display device 800 is stretched, the third area A3 is an area that can be stretched by external pressure, so the additional light emitting device 140A disposed in the third area A3 is in the first area A1. Reliability may be relatively reduced compared to the light emitting device 140 disposed in . The additional light-emitting device 140A is fixed to the lower substrate 110 by an additional connection pattern (BPA), but because it is continuously exposed to external stress, its adhesion to the lower substrate 110 may decrease. Accordingly, by disposing the reinforcement layer 916 between the lower substrate 110 and the additional light-emitting device 140A, the additional light-emitting device 140A can be more firmly fixed to the lower substrate 110.

Referring to FIGS. 8 and 9 , the reinforcement layer 916 is disposed in the third area A3 on the lower substrate 110. The reinforcement layer 916 may be composed of a single layer or multiple layers, and may be made of an organic material. For example, the reinforcement layer 916 may be made of an acryl-based organic material, but is not limited thereto.

Referring to FIGS. 10A and 10B , the process in which the additional light emitting device 140A is firmly fixed to the lower substrate 110 by the reinforcement layer 916 can be confirmed. First, an enhancement layer 916 is formed on the lower substrate 110 in an area where the additional sub-pixel (SPXA) will be placed. The reinforcement layer 916 may be formed on the piezoelectric pattern PP and the periphery of the area where the additional light emitting element 140A will be placed. Additionally, it may be formed around the end of the additional connection substrate (CSA). However, it is preferable that it is formed so as not to overlap the first additional electrode 144A and the second additional electrode 145A. After the reinforcement layer 916 is formed on the lower substrate 110, the additional light emitting device 140A is transferred to the additional sub-pixel (SPXA) area. At this time, when pressure is applied from the top of the additional light emitting device 140A, the reinforcement layer 916 and the additional light emitting device 140A may be brought into closer contact. That is, as the void between the reinforcement layer 916 and the additional light-emitting device 140A is filled with the reinforcement layer 916, the rigidity of the area where the additional light-emitting device 140A is located can be increased. Accordingly, even if the third area A3 expands due to external pressure, etc., the additional light emitting device 140A can be safely protected. Meanwhile, the stretchable display device 800 shown in FIGS. 8 and 9 may further include an adhesive layer 117 on the lower substrate 110 on which the reinforcement layer 916 and the additional light emitting device 140A are disposed. there is. The configuration of the adhesive layer 117 is substantially the same as that of the stretchable display device 100 shown in FIGS. 2 and 3, and duplicate descriptions will be omitted.

FIGS. 11A and 11B are enlarged plan views of region II of the stretchable display device 800 shown in FIG. 8 . Referring to FIG. 11A, the enhancement layer 916 may be arranged to overlap a plurality of additional sub-pixels (SPXA). Additionally, the reinforcement layer 916 may be arranged to surround the periphery of the additional pixel (SPA). Accordingly, the additional light emitting device 140A can be firmly fixed to the lower substrate 110. Referring to FIG. 11B, the enhancement layer 916 may be arranged in a plurality of isolated forms in the additional pixel (PXA) area. That is, the enhancement layer 916 may be arranged to overlap each additional sub-pixel (SPXA) or surround each additional sub-pixel (SPXA). Accordingly, the additional light emitting device 140A disposed in each additional sub-pixel SPXA can be tightly bound to the lower substrate 110 and at the same time, the third area A3 can be stretched more flexibly.

FIGS. 12A and 12B are schematic cross-sectional views of additional sub-pixels of a stretchable display device according to another embodiment of the present invention, showing regions Ⅰ-Ⅰ' of the stretchable display device 800 shown in FIG. 8. This is a cross-sectional view of the additional sub-pixel (SPXA). Compared to the stretchable display device 100 shown in FIGS. 1 to 3, the stretchable display device 800 of FIGS. 12A and 12B further includes a reinforcement layer 916 and has a piezoelectric pattern PP', Since they are substantially the same except that the form of PP'') is different, redundant description will be omitted.

Referring to FIG. 12A , the piezoelectric pattern PP' may be formed to include an area that overlaps with the reinforcement layer 916 and an area that does not overlap. That is, the piezoelectric pattern PP' overlaps with the reinforcement layer 916, thereby weakening the degree to which the lower substrate 110 is stretched, and does not overlap with the reinforcement layer 816 in an area that is relatively less stressed by external pressure. The lower substrate 110 can be better stretched and formed in all areas that are highly stressed by external pressure. Therefore, even if the third area A3 is expanded, the piezoelectric pattern PP' maintains a firm electrical bond with the additional light emitting element 140A, and the time to converge to a specific voltage can be shortened by evenly receiving stress from external pressure. there is.

The piezoelectric pattern PP'' may include a plurality of uneven portions. The piezoelectric pattern PP'' shown in FIG. 12B has an increased contact surface with the lower substrate 110 compared to the piezoelectric pattern PP' shown in FIG. 12A. And, as the surface in contact with the lower substrate 110 increases, the piezoelectric pattern PP'' receives more stress from external pressure. Meanwhile, the plurality of concavo-convex portions included in the piezoelectric pattern PP'' may be mainly distributed in areas that do not overlap with the reinforcement layer 916. Accordingly, the piezoelectric pattern PP'' may be more greatly affected by stress when the lower substrate 110 is stretched. The uneven portion may be formed to include a plurality of protrusions from the flat piezoelectric pattern (PP'') body. Some areas of the uneven portion may overlap with the reinforcement layer, and some remaining areas may not overlap with the reinforcement layer. However, it is not limited to this, and the uneven portion may be formed only in areas that do not overlap with the reinforcement layer.

In FIG. 12B, the piezoelectric pattern PP'' is shown as having a shape with a plurality of concavo-convex structures protruding from the lower surface, but it is not necessarily limited to this. For example, the piezoelectric pattern may have a polygonal cross-section or a shape that protrudes in a plane direction. Additionally, the area protruding in the planar direction may further include a plurality of uneven portions protruding in the vertical direction. In this way, the piezoelectric pattern with an increased area in contact with the lower substrate 110 receives stress due to external pressure more efficiently, and thus the time to converge to a specific voltage can be shortened. Additionally, the piezoelectric pattern may be shaped to include a portion extending in a direction perpendicular to the direction in which the third area A3 is stretched so that more stress from external pressure is applied.

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

A stretchable display device according to an embodiment of the present invention has a plurality of sub-pixels defined, a plurality of first regions spaced apart from each other, and a plurality of connection wires connecting adjacent first regions of the plurality of first regions. A lower substrate including a plurality of second regions and a plurality of third regions excluding the plurality of first regions and the plurality of second regions, a plurality of additional sub-pixels disposed in each of the plurality of third regions, and It includes a plurality of piezoelectric patterns electrically connected to each of a plurality of additional sub-pixels.

According to another feature of the present invention, a plurality of island substrates arranged in a plurality of first areas and having a plurality of sub-pixels defined, a plurality of light emitting elements arranged in a plurality of sub-pixels on the plurality of island substrates, and a plurality of additional sub-pixels. It further includes a plurality of additional light-emitting elements disposed in the pixel, wherein the plurality of light-emitting elements include a light-emitting layer, a first electrode electrically connected to the light-emitting layer, and a second electrode electrically connected to the light-emitting layer and spaced apart from the first electrode. , each of the plurality of additional light-emitting elements includes an additional light-emitting layer, a first additional electrode electrically connected to the additional light-emitting layer, and a second additional electrode electrically connected to the additional light-emitting layer and spaced apart from the first additional electrode, and a plurality of piezoelectric patterns. may be electrically connected to the second additional electrode of the plurality of additional light emitting devices.

According to another feature of the present invention, the same voltage may be applied to the first electrode of the first light-emitting device among the plurality of light-emitting devices and the first additional electrode of the first additional light-emitting device among the plurality of additional light-emitting devices.

According to another feature of the present invention, among the plurality of island substrates, the first light-emitting device is disposed on an island substrate, and the same voltage is applied to the first electrode of the first light-emitting device and the first additional electrode of the first additional light-emitting device. It may further include a first transistor for applying power.

According to another feature of the present invention, the plurality of light-emitting elements and the plurality of additional light-emitting elements may be configured to be driven independently.

According to another feature of the present invention, a first transistor connected to the first electrode of the first light-emitting device among the plurality of light-emitting devices and disposed on the island substrate on which the first light-emitting device is disposed among the plurality of island substrates and a plurality of additional transistors It may further include a second transistor connected to the first additional electrode of the first additional light emitting device among the light emitting devices and disposed on the same island substrate as the first transistor.

According to another feature of the present invention, a plurality of additional connection wires are electrically connected to the first additional electrodes of each of the plurality of additional light emitting elements, and the plurality of additional connection wires are disposed between the plurality of additional connection wires and the lower substrate, and are integrated with the plurality of island substrates. It may further include a plurality of additional connection substrates made of.

According to another feature of the present invention, it may further include a plurality of additional connection patterns disposed adjacent to the plurality of additional connection substrates and electrically connecting the plurality of piezoelectric patterns and the second additional electrodes of the plurality of additional light-emitting devices. there is.

According to another feature of the present invention, it may further include an additional insulating layer disposed between the plurality of additional connection wires and the plurality of additional connection substrates.

According to another feature of the present invention, each of the plurality of additional sub-pixels may be arranged at an angle with respect to the direction in which the plurality of connection wires extend.

According to another feature of the present invention, the lower substrate further includes grooves disposed in a plurality of third regions, and a plurality of piezoelectric patterns may be disposed in the grooves.

According to another feature of the present invention, it further includes an enhancement layer disposed in a plurality of additional sub-pixels, and the enhancement layer may be arranged to overlap the additional light-emitting device.

According to another feature of the present invention, the plurality of piezoelectric patterns may include a plurality of protrusions in contact with the lower substrate.

A stretchable display device according to another embodiment of the present invention includes a plurality of light-emitting elements disposed, a plurality of rigid substrates spaced apart from each other, and a pad disposed on adjacent rigid substrates among the plurality of rigid substrates. A plurality of connection wires, a plurality of rigid substrates and a lower substrate disposed below the plurality of connection wirings, a plurality of additional light-emitting elements arranged to be spaced apart from the plurality of rigid substrates and the plurality of connection wirings on the lower substrate, and a plurality of additional light-emitting elements; A plurality of piezoelectric patterns are electrically connected and generate a first voltage by stretching the lower substrate, and the first voltage from the plurality of piezoelectric patterns is generated when the lower substrate is stretched to minimize the grid feeling generated when the lower substrate is stretched. Light may be emitted from a plurality of additional light emitting elements by voltage.

According to another feature of the present invention, when an external force is applied to the plurality of piezoelectric patterns by stretching the lower substrate, the first voltage is applied from the plurality of piezoelectric patterns to the plurality of additional light-emitting elements, and is applied to the plurality of piezoelectric patterns. When the external force is removed, the plurality of piezoelectric patterns may be electrically floating.

According to another feature of the present invention, the plurality of additional light-emitting elements are electrically connected to a plurality of additional light-emitting layers, a plurality of first electrodes electrically connected to each of the plurality of additional light-emitting layers, and each of the plurality of additional light-emitting layers, and It includes a plurality of second additional electrodes spaced apart from each of the first additional electrodes, and each of the plurality of second additional electrodes may be electrically connected to each of the plurality of piezoelectric patterns.

According to another feature of the present invention, a plurality of first transistors disposed on a plurality of rigid substrates and electrically connected to each of the plurality of light-emitting devices, and a plurality of first transistors and a plurality of additional first transistors and a plurality of additional light-emitting devices. It may further include a plurality of additional connection wires that electrically connect the electrodes.

According to another feature of the present invention, a plurality of first transistors disposed on a plurality of rigid substrates and electrically connected to each of the plurality of light emitting devices, a plurality of second transistors disposed on a plurality of rigid substrates, and a plurality of 2. It may further include a plurality of additional connection wires electrically connecting the transistor and the plurality of additional first electrodes of the plurality of additional light emitting devices.

According to another feature of the present invention, the plurality of additional connection wires may be arranged to have an inclination with respect to the plurality of connection wires.

According to another feature of the present invention, the lower surface of the plurality of piezoelectric patterns may be disposed between the lower surface of the lower substrate and the upper surface of the lower substrate.

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

100, 400, 600: Stretchable display device
110: lower substrate
111: Island board
112: buffer layer
113: Gate insulating layer
114: Interlayer insulation layer
115: Flattening layer
116: bank
117: Adhesive layer
418: additional insulating layer
120: first transistor
121: first active layer
122: first gate electrode
123: first source electrode
124: first drain electrode
620: second transistor
621: second active layer
622: second gate electrode
623: second source electrode
624: second drain electrode
131: first pad
132: second pad
140: light emitting element
141: first semiconductor layer
142: light emitting layer
143: second semiconductor layer
144: first electrode
145: second electrode
140A: Additional light emitting element
141A: first additional semiconductor layer
142A: Additional emitting layer
143A: second additional semiconductor layer
144A: first additional electrode
145A: second additional electrode
150: connection wiring
151: first connection wiring
152: second connection wiring
150A, 450A: Additional connection wiring
160: upper substrate
170: C.O.F.
171: Base film
172: driver IC
180: printed circuit board
190: Polarizing layer
916: Reinforced layer
AA: display area
NA: Non-display area
CS: Connecting board
CSA: Additional connection board
A1: first area
A2: Second area
A3: Third area
PX: pixels
SPX: Sub pixel
PXA: Additional Pixels
SPXA: Additional sub-pixel
CL: Common wiring
GP: gate pad
BP: connection pattern
BP1: first connection pattern
BP2: Second connection pattern
BPA: Additional Access Patterns
BP1A: First additional connection pattern
BP2A: Second additional connection pattern
PP, PP', PP'': piezoelectric pattern
LL: Additional wiring

Claims (20)

A plurality of first regions in which a plurality of sub-pixels are defined and spaced apart from each other, a plurality of second regions in which a plurality of connection wires connecting neighboring first regions among the plurality of first regions are disposed, and the plurality of first regions are disposed. a lower substrate including one region and a plurality of third regions excluding the plurality of second regions;
a plurality of island substrates disposed on the lower substrate in the plurality of first regions and having stiffer characteristics than the lower substrate;
a plurality of additional sub-pixels disposed in each of the plurality of third areas; and
Comprising a plurality of piezoelectric patterns electrically connected to each of the plurality of additional sub-pixels,
The plurality of sub-pixels are disposed on the island substrate,
A stretchable display device, wherein the plurality of additional sub-pixels are disposed on the lower substrate. According to paragraph 1,
a plurality of light emitting elements disposed in the plurality of sub-pixels on the plurality of island substrates; and
Further comprising a plurality of additional light-emitting devices disposed in the plurality of additional sub-pixels on the lower substrate,
The plurality of light emitting devices are:
light emitting layer;
a first electrode electrically connected to the light emitting layer; and
Comprising a second electrode electrically connected to the light emitting layer and spaced apart from the first electrode,
Each of the plurality of additional light-emitting devices,
Additional light-emitting layer;
a first additional electrode electrically connected to the additional light emitting layer; and
A second additional electrode electrically connected to the additional light emitting layer and spaced apart from the first additional electrode,
A stretchable display device, wherein the plurality of piezoelectric patterns are electrically connected to second additional electrodes of the plurality of additional light-emitting devices. According to paragraph 2,
The stretchable display device is configured such that the same voltage is applied to the first electrode of the first light-emitting device among the plurality of light-emitting devices and the first additional electrode of the first light-emitting device among the plurality of additional light-emitting devices. According to paragraph 3,
A first transistor disposed on the island substrate on which the first light-emitting device is disposed among the plurality of island substrates, and applying the same voltage to the first electrode of the first light-emitting device and the first additional electrode of the first additional light-emitting device A stretchable display device further comprising: According to paragraph 2,
A stretchable display device wherein the plurality of light-emitting devices and the plurality of additional light-emitting devices are configured to be driven independently. According to clause 5,
a first transistor connected to a first electrode of a first light-emitting device among the plurality of light-emitting devices and disposed on an island substrate among the plurality of island substrates on which the first light-emitting device is disposed; and
The stretchable display device further includes a second transistor connected to a first additional electrode of a first additional light-emitting device among the plurality of additional light-emitting devices and disposed on the same island substrate as the first transistor. According to paragraph 2,
a plurality of additional connection wires electrically connected to first additional electrodes of each of the plurality of additional light emitting devices; and
The stretchable display device further includes a plurality of additional connection substrates disposed between the plurality of additional connection wires and the lower substrate and integral with the plurality of island substrates. In clause 7,
The stretchable display device further includes a plurality of additional connection patterns disposed adjacent to the plurality of additional connection substrates and electrically connecting the plurality of piezoelectric patterns and second additional electrodes of the plurality of additional light-emitting devices. In clause 7,
The stretchable display device further includes an additional insulating layer disposed between the plurality of additional connection wires and the plurality of additional connection substrates. According to paragraph 1,
A stretchable display device, wherein each of the plurality of additional sub-pixels is disposed at an angle with respect to an extension direction of the plurality of connection wires. According to paragraph 1,
The lower substrate further includes grooves disposed in the plurality of third regions,
A stretchable display device, wherein the plurality of piezoelectric patterns are disposed in the groove. According to paragraph 2,
Further comprising a reinforcement layer disposed in the plurality of additional sub-pixels,
A stretchable display device, wherein the reinforcement layer overlaps the additional light emitting element. According to paragraph 2,
A stretchable display device, wherein the plurality of piezoelectric patterns include a plurality of protrusions in contact with the lower substrate. A plurality of rigid substrates on which a plurality of light emitting elements are disposed and spaced apart from each other;
a plurality of connection wires electrically connecting pads disposed on adjacent rigid substrates among the plurality of rigid substrates;
a lower substrate disposed below the plurality of rigid substrates and the plurality of connection wires;
a plurality of additional light emitting devices arranged on the lower substrate to be spaced apart from the plurality of rigid substrates and the plurality of connection wires; and
A plurality of piezoelectric patterns electrically connected to the plurality of additional light emitting elements and generating a first voltage by stretching the lower substrate,
A stretchable display device in which light is emitted from the plurality of additional light-emitting elements by the first voltage from the plurality of piezoelectric patterns when the lower substrate is stretched to minimize the grid feeling generated when the lower substrate is stretched. According to clause 14,
When an external force is applied to the plurality of piezoelectric patterns by stretching the lower substrate, the first voltage is applied from the plurality of piezoelectric patterns to the plurality of additional light-emitting devices,
When an external force applied to the plurality of piezoelectric patterns is removed, the plurality of piezoelectric patterns are electrically floating. According to clause 14,
The plurality of additional light-emitting devices are:
a plurality of additional light-emitting layers;
a plurality of first additional electrodes electrically connected to each of the plurality of additional light emitting layers; and
A plurality of second additional electrodes are electrically connected to each of the plurality of additional light-emitting layers and are spaced apart from each of the plurality of first additional electrodes,
Each of the plurality of second additional electrodes is electrically connected to each of the plurality of piezoelectric patterns. According to clause 16,
a plurality of first transistors disposed on the plurality of rigid substrates and electrically connected to each of the plurality of light emitting devices; and
The stretchable display device further includes a plurality of additional connection wires electrically connecting the plurality of first transistors and the plurality of additional electrodes of the plurality of additional light-emitting devices. According to clause 16,
a plurality of first transistors disposed on the plurality of rigid substrates and electrically connected to each of the plurality of light emitting devices;
a plurality of second transistors disposed on the plurality of rigid substrates; and
The stretchable display device further includes a plurality of additional connection wires electrically connecting the plurality of second transistors and the plurality of first additional electrodes of the plurality of additional light-emitting devices. According to any one of claims 17 and 18,
A stretchable display device, wherein the plurality of additional connection wires are arranged to have an inclination with respect to the plurality of connection wires. According to clause 14,
A stretchable display device wherein the lower surface of the plurality of piezoelectric patterns is disposed between the lower surface of the lower substrate and the upper surface of the lower substrate.

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