TWI712170B - Stretchable display device - Google Patents

Abstract

The present disclosure provides a stretchable display device, comprising: a lower substrate made of a stretchable insulating material and having an active area and a non-active area surrounding the active area; a plurality of island substrates spaced apart from each other and disposed in the active area of the lower substrate; pixels disposed on the plurality of island substrates respectively; and a plurality of connecting lines disposed between the plurality of island substrates on the lower substrate, and electrically connecting corresponding pads disposed within the plurality of island substrates respectively. The modulus of the plurality of island substrates is higher than the lower substrate.

Description

Stretchable display device

The present invention relates to a stretchable display device, particularly a stretchable display device that has an improved aperture ratio and compensated image quality even when stretched.

In computer monitors, televisions, and mobile phones, there are display devices that use self-luminous organic light-emitting displays (OLED) or liquid crystal displays (LCD) that require independent light sources.

Display devices are being used in more and more various fields, including not only computer monitors and televisions, but also personal mobile devices, and a display device with a wide active area, small size and low weight is also being studied.

Recently, a stretchable display device has been manufactured, which can be stretched or contracted in a specific direction, and can be achieved by forming display units or display circuits on a flexible substrate such as a flexible material plastic. It can be changed into various shapes and has attracted much attention as a next-generation display device.

The object of the present invention is to provide a stretchable display device, which can suppress image degradation of the display device when the display device is stretched by providing extra pixels with non-uniform shapes on the lower substrate.

Another object of the present invention is to provide a stretchable display device, which can improve the aperture ratio by arranging additional pixels in the area where the multiple island substrates and connection lines are not provided on the lower substrate.

Another object of the present invention is to provide a stretchable display device, which can minimize the stress concentration of the wires when the substrate is stretched by forming a non-uniform shape in the area formed by the connection lines on the lower substrate. Suppress line cracking.

The present invention is not limited to the above objects, and those skilled in the art can clearly understand other objects not mentioned above from the following description.

The stretchable display device provided by one aspect of the present invention includes a bottom substrate, a plurality of island substrates, a plurality of pixels, and a plurality of connection lines. The lower substrate is made of a stretchable insulating material, and the lower substrate has an active area and an inactive area, wherein the inactive area surrounds the active area. The island substrates are separated from each other and are arranged in the active area of the lower substrate. The pixels are respectively arranged on the island substrate. The connection lines are arranged between the island substrates on the lower substrate and are electrically connected to the corresponding pads, and the corresponding ones are respectively arranged in the island substrates. A modulus of the island substrate is higher than that of the lower substrate.

Other details of the exemplary embodiment are included in the detailed description and drawings.

The present invention has the following effects: by arranging additional sub-pixels in other areas on the lower substrate except the light-emitting area and the circuit area, the area that can stretch the display device is effectively used and the aperture ratio is increased.

The present invention has the following effects: by forming additional sub-pixels that can be stretched and in a curved shape, when the stretchable display device is stretched, the image quality of the stretchable display device is prevented from deteriorating.

The present invention has the following effects: by connecting additional sub-pixels to a circuit unit different from the existing sub-pixels, the sub-pixels are independently driven, thereby increasing the resolution.

In the present invention, by providing a flexible packaging layer on the additional sub-pixels, even when the stretchable display device is deformed such as bending or stretching, the additional sub-pixels can still be protected.

The present invention applies the uneven structure to the area where the connection circuit is arranged on the lower substrate, and converts the stress into bending stress when the substrate is stretched, thereby suppressing the crack of the lower substrate and the circuit.

The effects according to the present invention are not limited to the contents of the above examples, and more effects are included in this specification.

Through the exemplary embodiments described in detail below and with reference to the drawings, the advantages, features, and achieved implementations of the present invention will be clearly understood. Although the present invention is described in various forms of embodiments, the technical spirit of the present invention is not limited to these embodiments. These embodiments are provided only to fully convey the scope and disclosure content of the present invention to those skilled in the art. Therefore, the present invention is only defined by the scope of patent application.

The shapes, sizes, ratios, angles, numbers, etc. in the drawings are merely illustrative of the embodiments of the present invention, and the present invention is not limited to the drawings. In this specification, the same reference numerals generally always indicate the same elements. In addition, the description of known related technologies will be omitted in the following description to avoid obscuring the gist of the present invention. In the case of using "include", "include" and "have" in this manual, unless "only" is used, it should be understood that other components can be added. Unless clearly stated in the specification, terms in the singular form may include the meaning of the plural form.

Even if it is not clearly stated, the general error range should be included when explaining the components.

When describing the positional relationship between two components, the terms "upper", "above", "below", "below" and "near" are used. Unless the terms "only" or "direct" are used, these two terms can be included. There are one or more other components between two components.

If it is mentioned that the first element is "on" the second element, another element may be directly inserted or located between the first element and the second element.

Although terms such as "first" and "second" are used to describe various components, these elements are not limited to these terms. These terms are only used to distinguish one component from another. Therefore, in the technical thinking of the present invention, the first element may be named as the second element because it is mentioned later.

In this specification, the same reference numerals generally always indicate the same elements.

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

The features of the various embodiments of the present invention can be partially or completely combined or combined with each other, and can be interlocked and operated in various technical ways. The embodiments of the present invention can be executed independently of each other or can be executed in association with each other.

Hereinafter, a stretchable display device related to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

>Stretchable display device>

A stretchable display device may refer to a display device that can display images even if it is bent or stretched. Compared with general display devices in the prior art, the stretchable display device can have high flexibility. Therefore, the shape of the stretchable display device can be freely changed according to the user's operation methods such as bending or stretching the stretchable display device. For example, when the user holds and pulls one end of the stretchable display device, the stretchable display device can be stretched due to the force applied by the user. Or, when the user places the stretchable display device on an uneven wall, the stretchable display device can be bent into the shape of the wall. In addition, when the external force applied by the user is removed, the stretchable display device can be restored to its original shape.

FIG. 1 is an exploded schematic diagram of a stretchable display device according to an embodiment of the invention. Please refer to FIG. 1, the stretchable display device 100 includes a lower substrate 110, a plurality of island substrates 111, a plurality of connection lines 180, a plurality of chip on film (COF) 130, and a printed circuit board 140, an upper substrate 120 and a polarizing layer 190. For ease of description, FIG. 1 does not show an adhesive layer for bonding the lower substrate 110 and the upper substrate 120.

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 its material can be a bendable or stretchable insulating material. For example, the material of the lower substrate 110 may be silicone rubber such as polydimethylsiloxane (PDMS) or an elastomer such as polyurethane (PU), so the lower substrate 110 is flexible. However, the material of the lower substrate 110 is not limited to this.

The lower substrate 110, which is a flexible substrate, can be reversibly stretched and compressed. In addition, the elastic modulus of the lower substrate 110 can reach hundreds of megapascals (MPa), and the tensile fracture rate of the lower substrate 110 can reach 100% or more. The thickness of the lower substrate 110 may be 10 micrometers (μm) to 1 millimeter (mm), but is not limited to this.

The lower substrate 110 may have an active area AA and an inactive area NA, where the inactive area NA surrounds the active area AA.

The active area AA is a stretchable area for displaying images in the display device 100, and the active area AA is provided with light-emitting elements and various driving elements. The driving elements are used to drive the light-emitting elements. The active area AA includes a plurality of pixels, and these pixels include a plurality of sub-pixels. A plurality of pixels are arranged in the active area AA and include a plurality of light-emitting elements. Each sub-pixel can be connected to various lines. For example, each sub-pixel can be connected to various lines such as gate lines, data lines, high-potential power lines, low-potential power lines, and reference voltage lines.

The non-active area NA is an area adjacent to the active area AA. The non-active area NA is an area located beside and surrounding the active area AA. The non-active area NA is an area where no image is displayed, and lines, circuit elements, etc. can be arranged in the non-active area NA. For example, a plurality of pad portions may be provided in the non-active area NA, and the pad portions may be respectively connected to sub-pixels in the active area AA.

A plurality of island substrates 111 are provided on the lower substrate 110. The plurality of island substrates 111 are rigid substrates, are separated from each other, and are disposed on the lower substrate 110. The island substrate 111 may be harder than the lower substrate 110. In other words, the lower substrate 110 may be softer or more flexible than the island substrate 111, and the island substrate 111 may be more rigid than the lower substrate 110.

The material of the island substrate 111 can also be a flexible plastic material, for example, it can be polyimide (PI), polyacrylate, polyacetate, and so on.

The modulus of the island substrate 111 may be higher than the modulus of the lower substrate 110. This modulus is the modulus of elasticity, which represents the ratio of the amount of deformation of the substrate deformed by stress to the amount of stress applied to the substrate, and when the modulus is relatively high, the hardness is relatively high. Therefore, the island substrate 111 may be a rigid substrate that is more rigid than the lower substrate 110. The modulus of the island substrate 111 may be greater than the modulus of the lower substrate 110, or a thousand times the modulus of the lower substrate 110, but is not limited to this.

The connection line 180 is provided between these island substrates 111. The connection line 180 may be disposed between a plurality of pad portions and may be electrically connected to each pad portion, wherein the pad portion is disposed on the island substrate 111. The connection line 180 will be described in more detail with reference to FIG. 2.

The chip-on-chip laminated film 130 is a film with various components on the flexible base film 131, and is also a component used to provide signals to the sub-pixels in the active area AA. The flip-chip laminated film 130 can be bonded to the pad portion provided in the non-active area NA, and the power supply voltage, the data voltage, the gate voltage, etc. can be provided to each sub-pixel in the active area AA through the pad portion. Each flip-chip laminate film 130 includes a base film 131 and a driving integrated circuit 132, and in addition, may also include various other components.

The base film 131 is a layer that supports the drive integrated circuit 132 of the flip chip laminated film 130. The material of the base film 131 can be, for example, an insulating material with flexibility.

The driving integrated circuit 132 is a component that processes data for displaying images and a driving signal for processing data. Although the driving integrated circuit 132 is mounted in the manner of flip chip laminated film in FIG. 1, the driving integrated circuit 132 is not limited to this. The driving integrated circuit 132 can also be installed in a manner such as Chip On Glass (COG) or Tape Carrier Package (TCP).

Controllers such as integrated circuit chips and circuit units can be mounted on the printed circuit board 140. In addition, a memory or a processor, etc. can also be installed on the printed circuit board 140. The printed circuit board 140 is used to send signals for driving the pixels from the controller to the pixels.

The printed circuit board 140 is connected to the chip on film 130, so the chip on film 130 and the printed circuit board 140 can be electrically connected to each sub-pixel on the island substrate 111.

The upper substrate 120 is a substrate overlapping the lower substrate 110 to protect various components of the stretchable display device 100. The upper substrate 120 is a flexible substrate, and its material can be a bendable or stretchable insulating material. For example, the material of the upper substrate 120 may be a flexible material and may be the same as the material of the lower substrate 110, but is not limited to this.

The polarizing layer 190 is used to suppress the reflection of external light of the stretchable display device 100 and can be overlapped on the upper substrate 120 and can be disposed on the upper substrate 120. However, the polarizing layer 190 is not limited to this, and may be disposed under the upper substrate 120, or the polarizing layer 190 may be omitted, depending on the configuration of the stretchable display device 100.

Hereinafter, please refer to FIGS. 2 and 3 to describe in detail a stretchable display device 100 according to an embodiment of the present invention.

>Plane and section structure>

FIG. 2 is an enlarged plan view of a stretchable display device according to an embodiment of the invention. FIG. 3 is a schematic cross-sectional view of a sub-pixel in FIG. 1. Please also refer to Figure 1 for convenience.

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

Please refer to FIG. 3, a buffer layer 112 is disposed on the island substrate 111. The buffer layer 112 is formed on the island substrate 111 to protect various components of the stretchable display device 100 from the penetration of moisture and oxygen in the external environment from the lower substrate 110 and the island substrate 111. The material of the buffer layer 112 may be an insulating material. For example, it may be a single inorganic layer or multiple inorganic layers including silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), and the like. 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 formed only in the area overlapping the plurality of island substrates 111. As described above, because the material of the buffer layer 112 may be an inorganic material, when the stretchable display device 100 is stretched, the buffer layer 112 may be easily damaged such as cracking. Therefore, the buffer layer 112 is patterned in the shape of the island substrate 111 and is not formed in a region between the island substrates 111, so the buffer layer 112 can be formed only on the island substrate 111. As such, since the buffer layer 112 is formed only in the area overlapping with the rigid island substrate 111, even when the stretchable display device according to an embodiment of the present invention is deformed such as bending or stretching, The damage of the buffer layer 112 can still be suppressed.

3, a first transistor 150 is formed on the buffer layer 112, and the first transistor 150 includes a first gate 151, a first active layer 152, a first source 153, and a first drain 154. For example, a first active layer 152 is formed on the buffer layer 112, and a gate insulating layer 113 is formed on the first active layer 152 to insulate the first active layer 152 and the first gate 151 from each other. The interlayer insulating layer 114 is formed to insulate the first gate 151, the first source 153, and the first drain 154, and the first source 153 and the first drain 154 are formed on the interlayer insulating layer 114, wherein the first source 153 and the first drain electrode 154 are in contact with the first active layer 152 respectively.

The gate insulating layer 113 and the interlayer insulating layer 114 can be formed by patterning only in the area overlapping with the island substrate 111. The material of the gate insulating layer 113 and the interlayer insulating layer 114 can also be the same inorganic material as that of the buffer layer 112. Therefore, when the stretchable display device 100 is stretched, the gate insulating layer 113 and the interlayer insulating layer 114 may be Prone to damage such as cracking. Therefore, the gate insulating layer 113 and the interlayer insulating layer 114 are patterned in the shape of the island substrate 111 and are not formed in the area between the island substrates 111, so the gate insulating layer can be formed only on the island substrate 111 113 and the interlayer insulating layer 114.

For ease of description, FIG. 3 only shows driving transistors of various transistors included in the stretchable display device 100, but the display device may include switching transistors, capacitors, and so on. In addition, although the first transistor 150 is described as having a coplanar structure in this specification, various transistors having, for example, a staggered structure may be used.

Please refer to FIG. 3, a gate pad 171 is provided on the gate insulating layer 113. The gate pad 171 is used to send gate signals to the pad portions of the sub-pixels SPX. The material of the gate pad 171 can be the same material as the material of the first gate 151, but is not limited to this.

Referring to FIG. 3, a planarization layer 115 is formed on the first transistor 150 and the interlayer insulating layer 114. The planarization layer 115 planarizes the top of the first transistor 150. The planarization layer 115 may be a single-layer or multi-layer structure, and the material of the planarization layer 115 may be an organic material. For example, the material of the planarization layer 115 may be an acrylic-based organic material, but it is not limited thereto. The planarization layer 115 may have a contact hole for electrically connecting the first transistor 150 and an anode 161, a contact hole for electrically connecting a data pad 173 and the first source 153, and a contact hole for electrically connecting to a The contact hole between the connection pad 172 and the gate pad 171.

In some embodiments, a passivation layer may be formed between the first transistor 150 and the planarization layer 115. In other words, a passivation layer covering the first transistor 150 can be formed, so as to prevent the first transistor 150 from being penetrated by moisture, oxidation, and the like. The material of the passivation layer can be an inorganic material, and the passivation layer can be a single-layer or multi-layer structure, but it is not limited thereto.

Please refer to FIG. 3, the data pad 173, the connection pad 172 and the light-emitting element are disposed on the planarization layer 115. The light-emitting element may be any one of an organic light-emitting element and a light-emitting diode. It is worth noting that although the organic light emitting element 160 is exemplified as a light emitting element in FIG. 3 and other figures, the light emitting element of the stretchable display device according to the present invention may also be a light emitting diode or other forms of light emitting elements.

The data pad 173 can send the data signal from the connection line 180 as a data line to the sub-pixel SPX. The data pad 173 is connected to the first source electrode 153 of the first transistor 150 through the contact hole formed in the planarization layer 115. The material of the data pad 173 can be the same as the material of the anode 161 of the organic light emitting device 160, but is not limited to this. In addition, the material of the data pad 173 can be the same material as the material of the first source 153 and the first drain 154 of the first transistor 150, wherein the first source 153 and the first drain 154 are located in the interlayer insulating layer 114 instead of on the planarization layer 115.

The connection pad 172 can transmit the gate signal from the connection line 180 as a gate line to the sub-pixel SPX. The connection pad 172 is connected to the gate pad 171 through a contact hole formed in the planarization layer 115 and the interlayer insulating layer 114, and the connection pad 172 transmits a gate signal to the gate pad 171. The material of the connection pad 172 can be the same as the material of the data pad 173, but is not limited to this.

The plurality of organic light emitting elements 160 respectively correspond to the plurality of sub-pixels SPX, and emit light having a specific wavelength band. That is, the organic light-emitting element 160 may be a blue organic light-emitting element emitting blue light, a red organic light-emitting element emitting red light, a green organic light-emitting element emitting green light, or a white organic light-emitting element emitting white light. This is limited. When the organic light-emitting element 160 is a white organic light-emitting element, the stretchable display device may further include a color filter.

The organic light-emitting device 160 includes an anode 161, an organic light-emitting layer 162 and a cathode 163. In detail, the anode 161 is disposed on the planarization layer 115. The anode 161 is an electrode for providing holes to the organic light emitting layer 162. The material of the anode 161 may be a transparent conductive material with a high work function. The transparent conductive material may include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and Indium Tin Zinc Oxide (ITZO). The material of the anode 161 can be the same as the material of the connection pad 172 and the material pad 173 provided on the planarization layer 115, but it is not limited thereto. When the stretchable display device 100 is implemented in a top emission type, the anode 161 may further include a reflective plate.

The anode 161 is separated from the sub-pixel SPX, and is electrically connected to the first transistor 150 through the contact hole of the planarization layer 115. For example, although the anode 161 is shown in FIG. 2 as being electrically connected to the first drain electrode 154 of the first transistor 150, the anode 161 may be electrically connected to the first source electrode 153.

A bank 116 is formed on the anode 161, the data pad 173, the connection pad 172, and the planarization layer 115. The bank 116 is a member that separates adjacent sub-pixels SPX. The bank 116 at least partially covers both sides of the adjacent anode 161, thereby partially exposing the top surface of the anode 161. The bank 116 can suppress the color mixing of the light emitted by the anode 161 in the lateral direction due to current concentration at the corners of the anode 161, and the unexpected sub-pixel SPX will emit light. The material of the bank 116 can be acrylic-based resin, benzocyclobutene-based resin (BCB-based resin), or polyimide, but is not limited thereto.

The bank 116 has a contact hole for connecting the data pad 173 and the connection line 180 as a data line, and a contact hole for connecting the connection pad 172 and the connection line 180 as a gate line.

The organic light-emitting layer 162 is disposed on the anode 161. The organic light emitting layer 162 is used to emit light. The organic light emitting layer 162 may include a luminescent material, and the luminescent material may include a phosphorous material or a fluorescent material, but it is not limited thereto.

The organic light emitting layer 162 may be composed of one light emitting layer. Alternatively, the organic light-emitting layer 162 may have a stacked structure, in which multiple light-emitting layers are stacked, and a charge generation layer is provided between the multiple light-emitting layers. The organic light emitting layer 162 may further include at least one organic layer among a hole transport layer, an electron transport layer, a hole blocking layer, an electron blocking layer, a hole injection layer, and an electron injection layer.

2 and 3, the cathode 163 is disposed on the organic light-emitting layer 162. The cathode 163 supplies electrons to the organic light emitting layer 162. The material of the cathode 163 can be indium tin oxide based, indium zinc oxide based, indium tin zinc oxide based, zinc oxide based and tin oxide based transparent conductive oxide or Ytterbium (Yb) alloy. Alternatively, the material of the cathode 163 may be metal.

The cathodes 163 can be formed by patterning so as to overlap the island substrate 111 respectively. In other words, the cathode 163 may not be provided in the region between the plurality of island substrates 111 but only in the region overlapping with the island substrate 111. Because the material of the cathode 163 is transparent conductive oxide or metal material, etc., even if the cathode 163 is formed in the region between the plurality of island substrates 111, when the stretchable display device 100 is stretched or compressed, the cathode 163 It will be damaged. Therefore, the cathode 163 may be formed on a plane corresponding to a plurality of island substrates 111, respectively. Referring to FIGS. 2 and 3, the cathode 163 may have an area that does not overlap with the area where the connection line 180 is provided and overlaps with the plurality of island substrates 111.

Different from ordinary organic light-emitting display devices, the cathode 163 can be formed by patterning to correspond to the multiple island substrates 111 in the stretchable display device 100 according to an embodiment of the present invention. Therefore, each cathode 163 provided on the island substrate 111 can independently provide low-potential power through the connection line 180.

2 and 3, an encapsulation layer 117 is disposed on the organic light emitting element 160. The encapsulation layer 117 can seal the organic light emitting element 160 by covering the organic light emitting element 160 contacting a part of the top surface of the bank 116. Therefore, the encapsulation layer 117 protects the organic light emitting element 160 from moisture, air or physical impact that may penetrate from the outside.

The encapsulation layer 117 respectively covers the cathode 163 and can be formed on a plurality of island substrates 111 respectively, wherein the cathode 163 is patterned to overlap the island substrate 111. That is, the encapsulation layers 117 each cover one cathode 163 on one island substrate 111, and the encapsulation layers 117 provided on each island substrate 111 can be separated from each other.

The encapsulation layer 117 may be formed only in a region overlapping with the island substrate 111. As described above, because the encapsulation layer 117 may include an inorganic layer, when the stretchable display device 100 is stretched, the encapsulation layer 117 may be easily damaged such as cracks. In particular, because the organic light emitting element 160 is easily affected by moisture or oxygen, when the encapsulation layer 117 is damaged, the reliability of the organic light emitting element 160 may be reduced. Therefore, since in the stretchable display device 100 according to an embodiment of the present invention, the encapsulation layer 117 is not formed in the area between the plurality of island substrates 111, even the stretchable display device 100 according to an embodiment of the present invention When the stretched display device 100 is deformed such as bending or stretching, the damage to the encapsulation layer 117 can still be minimized.

Compared with conventional flexible organic light emitting display devices, the stretchable display device 100 according to an embodiment of the present invention has the following structural features: a plurality of island substrates 111 that are relatively rigid and separated from each other are arranged On the lower substrate 110 which is relatively soft or relatively flexible. The cathode 163 and the encapsulation layer 117 of the stretchable device 100 respectively correspond to the island substrate 111 by patterning. In other words, the stretchable display device 100 according to an embodiment of the present invention may have a specific structure, so that when the user stretches or bends the stretchable display device 100, the stretchable display device 100 can be more It is easily deformed; and can have a specific structure, so that when the stretchable display device 100 is deformed, damage to the components of the stretchable display device 100 can be minimized.

>Connecting circuit composed of basic polymer and conductive particles>

The connecting circuit 180 is a circuit electrically connected to the pad on the island substrate 111. The connection line 180 includes a first connection line 181 and a second connection line 182. The first connecting line 181 is a line extending along the X-axis direction of the connecting line 180, and the second connecting line 182 is a line extending along the Y-axis direction of the connecting line 180.

In a general organic light emitting display device, various lines such as gate lines and data lines are extended and arranged between a plurality of sub-pixels, and the plurality of sub-pixels are connected to a signal line. Therefore, in general organic light-emitting display devices, various lines such as gate lines, data lines, high-potential power lines, and reference voltage lines extend from one side of the organic light-emitting display device to the other without being disconnected on the substrate.

However, in the stretchable display device 100 according to an embodiment of the present invention, lines made of metal such as gate lines, data lines, high-potential power lines, and reference voltage lines are only provided on the island substrate 111 . In other words, in the stretchable display device 100 according to an embodiment of the present invention, the wires made of various materials and metals may be provided only on the island substrate 111 and may not be in contact with the lower substrate 110. Therefore, various circuits can be arranged in a patterned manner, thereby corresponding to the island substrate 111, and various circuits can be arranged in a discontinuous manner.

In the stretchable display device 100 according to an embodiment of the present invention, the pads on two adjacent island substrates 111 can be connected by a connecting line 180 to connect discontinuous line segments. In other words, the connection line 180 electrically connects the pads on two adjacent island substrates 111. Therefore, the stretchable display device 100 of the present invention may include a plurality of connection lines 180 to electrically connect various lines between the plurality of island substrates 111, and the various lines are, for example, gate lines, data lines, and high-potential power lines. Circuit and reference voltage circuit. For example, the gate line may be provided on a plurality of island substrates 111 arranged adjacent to each other along the X-axis direction, and the gate pads 171 may be provided at both ends of the gate line. At this time, each of the gate pads 171 on the plurality of island substrates 111 arranged adjacent to each other along the X-axis direction can be connected to each other by the connection line 180 as a gate line. Therefore, the gate line provided on the island substrate 111 and the connection line 180 provided on the lower substrate 110 can be used as one gate line. In addition, all the various circuits that can be included in the stretchable display device 100 can also be used as one circuit by connecting the circuit 180 as described above. The various circuits are, for example, gate circuits, high-potential power circuits, and reference voltages. line.

Referring to FIG. 2, the first connection line 181 may be connected to the pad portion, wherein the pad portion is attached to two parallel island substrates 111 among the plurality of island substrates 111 arranged adjacently along the X-axis direction. The first connection line 181 can be used as a gate line or a low-potential power line, but is not limited to this. For example, the first connection line 181 can be used as a gate line, and is electrically connected to a plurality of gate pads on two island substrates 111 parallel to the X axis through a contact hole formed in the bank 116 171. Therefore, as described above, the gate pads 171 on the plurality of island substrates 111 arranged along the X-axis direction can be connected to each other by the first connection line 181 as the gate line, and can send a gate signal .

Referring to FIG. 2, the second connection line 182 may be connected to the pad portion, wherein the pad portion is attached to two parallel island substrates 111 among the plurality of island substrates 111 arranged adjacently along the Y direction. The second connection line 182 can be used as a data line, a high-potential power line or a reference voltage line, but is not limited to this. For example, the second connection line 182 can be used as a data line and is electrically connected to a plurality of data pads 173 on two island substrates 111 parallel to the Y axis through a contact hole formed in the bank 116. Therefore, as described above, the data pads 173 on the island substrate 111 arranged along the Y-axis direction can be connected to each other through the second connection line 182 as the data line, and can send a data signal.

Please refer to FIG. 2, the connecting circuit 180 includes a base polymer (also referred to as a base film) and a plurality of conductive particles. In detail, the first connection line 181 includes a basic polymer and a plurality of conductive particles, and the second connection line 182 includes a basic polymer and a plurality of conductive particles.

The first connection line 181 can be formed by extending from the top surface of the lower substrate 110, so that the first connection line 181 is in contact with multiple sides of the island substrate 111 and the buffer layer 112, which is provided on the island substrate 111, The gate insulating layer 113, the interlayer insulating layer 114, the planarization layer 115, and the side portions of the bank 116 are in contact with the top and side portions of the bank 116. Therefore, the first connection line 181 can contact the top surface of the lower substrate 110, the side of the adjacent island substrate 111, and the buffer layer 112, the gate insulating layer 113, and the interlayer provided on the adjacent island substrate 111. These sides of the insulating layer 114, the planarization layer 115, and the bank 116. The first connection line 181 can contact the connection pad 172 provided on the adjacent island substrate 111, but is not limited to this.

The material of the base polymer of the first connection line 181 may be similar to the material of the lower substrate 110 but a bendable or stretchable insulating material. For example, the base polymer may include styrene butadiene styrene (SBS), but not limited thereto. Therefore, when the stretchable display device 100 is bent or stretched, the base polymer is not damaged. The base polymer can be formed by coating the material for the base polymer, or applying the material through the slits on the lower substrate 110 and the island substrate 111.

The conductive particles of the first connection line 181 can be distributed by the base polymer. In detail, the first connection line 181 may include conductive particles distributed in a predetermined density in the base polymer. For example, the first connection line 181 can be formed by uniformly stirring the conductive particles in the base polymer, and then the base polymer with the conductive particles distributed is coated or hardened on the lower substrate 110 and the island substrate 111 , But not limited to this. The conductive particles may include at least one of silver, gold, and carbon, but not limited thereto.

The conductive particles distributed in the base polymer of the first connection line 181 can form a conductive path electrically connected to the connection pad 172, wherein each connection pad 172 is disposed on the adjacent island substrate 111. In addition, the conductive particles can form a conductive path that electrically connects the gate pad 171 to the pad. The gate pad 171 is formed on the outermost island substrate 111, and the pad is disposed in the non-active area NA .

Please refer to FIG. 2, the conductive particles and the base polymer distributed in the base polymer of the first connection line 181 may be connected in a linear shape between the pads provided on the adjacent island substrate 111. For this reason, in the manufacturing process, the base polymer may be formed in a linear shape and connected between the pads provided on the island substrate 111. Therefore, the conductive path formed by the conductive particles distributed in the base polymer may also have a linear shape. However, the process of forming the conductive particles of the base polymer and the first connecting line 181 and their shapes are not limited to this.

Referring to FIG. 2, the second connection line 182 can be formed by extending from the top surface of the lower substrate 110, so that the second connection line 182 is in contact with multiple sides of the island substrate 111 and is disposed on the island substrate 111 The buffer layer 112, the gate insulating layer 113, the interlayer insulating layer 114, the planarization layer 115 and the side portions of the bank 116 are in contact with the top and side portions of the bank 116. Therefore, the second connection line 182 can contact the top surface of the lower substrate 110, the side of the adjacent island substrate 111, and the buffer layer 112, the gate insulating layer 113, and the interlayer provided on the adjacent island substrate 111. These sides of the insulating layer 114, the planarization layer 115, and the bank 116. The second connection line 182 can contact the data pad 173 provided on the adjacent island substrate 111, but is not limited to this.

The material of the base polymer of the second connection line 182 may be similar to the material of the lower substrate 110 and be a bendable or stretchable insulating material, and may be the same material as the material of the base polymer of the first connection line 181. For example, the base polymer may include styrene butadiene styrene, etc., but not limited thereto.

In addition, the conductive particles of the second connection line 182 may be distributed in the base polymer. In detail, the second connection line 182 may include conductive particles distributed in a predetermined density in the base polymer. At this time, the top and bottom conductive particles distributed in the base polymer may have substantially the same density. In addition, the manufacturing process of the second connection line 182 may be the same as the manufacturing process of the first connection line 181 or performed simultaneously.

The conductive particles distributed in the base polymer of the second connection line 182 can form a conductive path electrically connected to the data pad 173, wherein the data pads 173 are respectively disposed on the adjacent island substrate 111. In addition, the conductive particles can form a conductive path that electrically connects the data pad 173 to the pad portion. The data pad 173 is formed on the outermost island substrate 111, and the pad portion is disposed in the non-active area NA.

Referring to FIG. 2, the conductive particles and the base polymer distributed in the base polymer of the second connection line 182 may be connected in a linear shape between the pads provided on the adjacent island substrate 111. For this reason, in the manufacturing process, the base polymer may be formed in a linear shape and connected between the pads provided on the island substrate 111. Therefore, the conductive path formed by the conductive particles distributed in the base polymer may also have a linear shape. However, the process of forming the conductive particles of the base polymer and the second connecting line 182 and their shapes are not limited to this.

In some embodiments, the conductive particles distributed in the base polymer of the connection line 180 may be distributed and arranged in the base polymer with a density gradient. Because the density of the conductive particles gradually decreases from the top to the bottom of the base polymer, the conductivity of the conductive particles can be the largest on the top of the base polymer. In detail, the conductive particles can be injected and distributed in the base polymer by performing an ink printing process, wherein the ink printing process uses a conductive precursor or the like on the top surface of the base polymer. When the conductive particles are injected into the base polymer, the conductive particles can penetrate into the voids of the base polymer while the polymer expands several times. Thereafter, the connection line 180 may be formed by immersing the base polymer infused with conductive particles into the reducing material, or reducing the base polymer with steam. Therefore, the conductive particles on the permeation area on the top of the base polymer can have a high density, so that a conductive path can be formed. The thickness of the penetration area where high-density conductive particles are distributed on the top of the base polymer may depend on the time and intensity of injecting the conductive particles through the top surface of the base polymer. For example, when the time and intensity of injecting conductive particles through the top surface of the base polymer increase, the thickness of the penetration area can be increased. Because each conductive particle can be in contact with each other on top of the base polymer, the conductive particles in contact with each other can form a conductive path, and then can send an electrical signal.

In some embodiments, the base polymer of the connection line 180 may be formed as a single layer between adjacent island substrates 111 on the lower substrate 110. In detail, different from FIG. 2, the base polymer may be provided as a single layer in contact with the lower substrate 110 between the island substrates 111 that are most adjacent in the X-axis direction. The base polymer can be overlapped with all the pads arranged in parallel on one side of the island substrate 111. The conductive particles can be formed independently to form a plurality of conductive paths on a single layer of the base polymer, and thereby correspond to a plurality of pad parts respectively. Therefore, the conductive path formed by the conductive particles can be connected in a linear shape between the pads provided on the adjacent island substrate 111. For example, conductive particles can be injected to form four conductive paths on the base polymer as a single layer between the island substrates 111.

In addition, in some embodiments, the base polymer of the connection line 180 may be provided in all areas where the island substrate 111 is not provided. The base polymer may be used as a single layer in contact with the lower substrate 110 and disposed on the rigid substrate of the lower substrate 110, that is, disposed in other regions that do not overlap with the island substrate 111. Therefore, because the base polymer can cover other areas of the lower substrate 110 that are not overlapped with the island substrate 111, and the base polymer can contact the pad of the island substrate 111, part of the base polymer can cover the island. The edge of the substrate 111. In addition, the conductive particles can form a conductive path in the base polymer, wherein the conductive path connects a plurality of pads on the adjacent island substrate 111.

When the base polymer is provided as a single layer in the entire area of the lower substrate 110 where the island substrate 111 is not provided, the base polymer can be formed by applying the base polymer to the entire area of the lower substrate 110 where the island substrate 111 is not provided. Things. Therefore, there is no need for a separate process to pattern the base polymer. Therefore, the manufacturing process of the base polymer and the connecting line can be simplified, and the manufacturing cost and time can be reduced.

In addition, because the base polymer is provided as a single layer in the entire area of the lower substrate 110 where the island substrate 111 is not provided, when the stretchable display device 100 is bent or stretched, the applied force can be dispersed. In addition, in some embodiments, the top surface of the base polymer of the connecting circuit 180 may be flat. In detail, different from FIG. 3, the top surface of the base polymer, such as the connection line 180 of the gate line and the data line, can be higher than the top surface of the planarization layer 115 on the island substrate 111. . In addition, the top surface of the base polymer may be higher than the top surface of the bank 116 on the island substrate 111. Therefore, the height of the top surface of the portion overlapping with the island substrate 111 may be the same as the height of the top surface of the area provided between the island substrate 111. Therefore, the top surface of the connection line 180 can be flat. Therefore, in the cross-sectional view, the top surface of the conductive particles distributed on the top of the base polymer may be straight or straight without having a curved shape.

Because of the various components present on the island substrate 111 separately provided on the lower substrate 110, there may be a step difference between the top surface of the bank 116 and the top surface of the lower substrate 110. In this situation, the base polymer itself can be cut by the step difference on the top surface of the base polymer, so the conductive path between the pads on the adjacent island substrate 111 may be cut, and it can be stretched. The percentage defective of the display device may increase.

At this time, when the top surface of the base polymer is flat, the level difference between the top surface of the element provided on the island substrate 111 and the top surface of the lower substrate 110 where the island substrate 111 is not provided can be removed. Therefore, even if the stretchable display device 100 is bent or stretched, the cutting phenomenon caused by the step difference of the connection line 180 can be suppressed, wherein the connection line 180 includes a base polymer and conductive particles. In addition, because the top surface of the base polymer is flat in the stretchable display device 100 according to another embodiment of the present invention, it is possible to minimize the damage to the connecting line 180 during the manufacturing process of the stretchable display device 100. damage.

Please refer to FIG. 3 again, the upper substrate 120, the polarizing layer 190 and the adhesion layer 118 are disposed on the encapsulation layer 117 and the lower substrate 110.

The upper substrate 120 is a substrate supporting various components provided under the upper substrate 120. The upper substrate 120 is a flexible substrate, and its material can be a bendable or stretchable insulating material. The upper substrate 120 which is a flexible substrate can be reversibly stretched and compressed. In addition, the elastic modulus of the upper substrate 120 can reach hundreds of megapascals, and the tensile fracture rate of the upper substrate 120 can reach 100% or more. The thickness of the upper substrate 120 may be 10 μm to 1 mm, but is not limited thereto.

The material of the upper substrate 120 may be the same as the material of the lower substrate 110. For example, the material of the upper substrate 120 may be silicone rubber such as polydimethylsiloxane, or an elastomer such as polyurethane, so the upper substrate 120 has Flexible, but the material of the upper substrate 120 is not limited to this.

The upper substrate 120 and the lower substrate 110 can be bonded through the adhesive layer 118 provided under the upper substrate 120 and applying pressure to the upper substrate 120 and the lower substrate 110. However, the present invention is not limited to this, and the adhesive layer 118 may be omitted, depending on the aspect of each embodiment.

The polarizing layer 190 is provided on the upper substrate 120. The polarizing layer 190 may polarize light incident on the stretchable display device 100 from the outside. Since the light incident to the stretchable display device 100 and polarized through the polarizing layer 190 may be reflected in the stretchable display device 100, the phase of the light may be changed. The light whose phase has been changed may not pass through the polarizing layer 190. Therefore, light incident on the stretchable display device 100 from the outside will not be reflected to the outside of the stretchable display device 100, so the light reflection outside the stretchable display device 100 can be reduced.

>Tensile properties of multiple island substrates>

Because stretchable display devices need to be easily bent or stretched, attempts have been made to use substrates that are soft or flexible due to a smaller modulus. However, when these soft materials or flexible materials with a small modulus such as polydimethylsiloxane are used as the lower substrate in the manufacturing process of the light-emitting element, the problems are: Since materials with a smaller modulus are less heat-resistant, high temperatures, such as over 100 degrees Celsius, generated in the process of forming transistors and light-emitting elements can damage the substrate.

Accordingly, the light-emitting element should be formed on a substrate made of a material that can withstand high temperatures, so that damage to the substrate can be suppressed during the manufacturing process of the light-emitting element. Therefore, attempts have been made to manufacture the substrate using a material that can withstand the high temperature generated during the manufacturing process, such as polyimide. However, because the material that can withstand high temperatures has a large modulus and is not soft or flexible enough, when the stretchable display device is stretched, the substrate is not easily bent or stretched.

Therefore, because the island substrate 111 as a rigid substrate is only provided in the area where the first transistor 150 or the organic light-emitting element 160 of the stretchable display device 100 according to an embodiment of the present invention is provided, the first transistor Damage to the island substrate 111 due to high temperature during the manufacturing process of the organic light emitting element 160 or the organic light emitting element 160 can be suppressed.

In addition, the lower substrate 110 and the upper substrate 120 as flexible substrates may be disposed below or above the island substrate 111 in the stretchable display device 100 according to an embodiment of the present invention. In this way, other areas of the lower substrate 110 and the upper substrate 120 that are not overlapped with the island substrate 111 can be easily stretched or bent, so as to achieve the function of the stretchable display device 100. In addition, when the stretchable display device 100 is bent or stretched, damage to the first transistor 150, the organic light emitting element 160 and the like provided on the island substrate 111 as a rigid substrate can be suppressed.

>Efficacy of the connection line>

At the same time, when the stretchable display device is bent or stretched, the lower substrate, which is a flexible substrate, deforms, while the island substrate with organic light-emitting elements and is a rigid substrate does not deform. In this situation, if the circuit connected to each pad on the island substrate is not made of a material that can be easily bent or stretched, the circuit may be damaged such as cracking due to the deformation of the lower substrate .

In contrast, in the stretchable display device 100 according to an embodiment of the present invention, the connecting circuit 180 containing a base polymer and conductive particles may be used to connect the pads provided on each island substrate 111 Make electrical connections. The base polymer is soft or flexible and can be easily deformed. Therefore, the stretchable display device 100 according to an embodiment of the present invention may have the following effects: even if the stretchable display device 100 is deformed such as bending or stretching, the area between the island substrates 111 can still be easily borrowed It is deformed by the connection line 180 containing the base polymer.

In addition, according to the stretchable display device 100 according to an embodiment of the present invention, because the connection lines 180 contain conductive particles, even if the base polymer is deformed, the conductive path formed by the conductive particles will not suffer such as cracking. damage. For example, when the stretchable display device 100 undergoes deformation such as bending or stretching, the substrate 110 under the flexible substrate may be deformed in other regions where the island substrate 111 is not provided as a rigid substrate. At this time, the distance between the conductive particles provided on the deformed lower substrate 110 may change. Even when the distance between the conductive particles is increased, the conductive particles arranged on the top of the base polymer and forming a conductive path can still maintain a high-level density, and thus can still send electrical signals. Therefore, even if the base polymer is bent or stretched, the conductive path formed by the conductive particles can still send electrical signals smoothly. In addition, even if the stretchable display device 100 is deformed such as bending or stretching, electrical signals can still be sent between the pads respectively.

In the stretchable display device 100 according to an embodiment of the present invention, because the connection lines 180 include a base polymer and conductive particles, they are connected to the pads provided on the adjacent island substrate 111 respectively. The line 180 may be arranged in a linear shape to form the shortest distance. In other words, even if the connecting line 180 is not formed in a curved shape, the function of the stretchable display device 100 can still be achieved. The conductive particles of the connection line 180 are distributed in the base polymer and form a conductive path. In addition, when the stretchable display device 100 undergoes deformation such as bending or stretching, the conductive path formed by the conductive particles may be bent or stretched. In this situation, only the distance between the conductive particles is changed, and the conductive path formed by the conductive particles can still send electrical signals. Therefore, in the stretchable display device 100 according to an embodiment of the present invention, the space occupied by the connection line 180 can be minimized.

>Contains conductive parts and has a curved connection line>

4 is an enlarged plan view of a stretchable display device according to another embodiment of the invention. FIG. 5 is a schematic cross-sectional view of a sub-pixel of the stretchable display device of FIG. 4. The essential difference between the stretchable display device 400 shown in FIG. 4 and FIG. 5 and the stretchable display device 100 shown in FIG. 3 is only that the stretchable display device 400 has different connection lines 480, so the same I will not repeat them here. For ease of description, FIG. 4 only shows the encapsulation layer 117 and the connection lines 480 of various components disposed on the island substrate 111.

Referring to FIG. 4, the connection line 480 of the stretchable display device 400 has a curved shape. The connection lines 480 are electrically connected to the pads provided on the adjacent island substrates 111 among the plurality of island substrates 111, and respectively extend into a curved shape instead of extending into a linear shape. For example, as shown in FIG. 4, the connecting line 480 may have a sine wave-like shape. However, the connection line 480 is not limited to this shape but may have various shapes. For example, the connection line 480 may extend into a saw shape, or a connection line that extends into a plurality of diamond shapes and is connected at the highest point.

Referring to FIG. 5, a gate pad 171 is formed on the gate insulating layer 113, and a first connection line 481 is formed on the gate insulating layer 113 and the lower substrate 110.

Referring to FIG. 5, the first connection line 481 which can be used as a gate line is connected to the gate pad 471 and extends from the top surface of the gate insulating layer 113 to the top surface of the lower substrate 110. Therefore, the first connection lines 481 can be electrically connected to the gate pads 471 respectively formed on the island substrate 111. The first connection line 481 contacts the lower substrate 110 between the island substrates 111.

The material of the first connection line 481 and the gate pad 471 may be the same as the material of the first gate 151. In this way, the first connection line 481 and the gate pad 471 can be formed simultaneously with the first gate 151 in the same manufacturing process. In this way, the first connection line 481 can be integrally formed by extending from the gate pad 471. However, the present invention is not limited to this. The gate pad 471 and the first connection line 481 can be made of different materials and can be electrically connected to each other and arranged on different layers.

Referring to FIG. 5, a second connection line 482, which can be used as a data line, is formed on the interlayer insulating layer 114. At this time, the first source electrode 153 that can be used as a data pad can extend to the outside of the first transistor 150 and can be electrically connected to the second connection line 482. However, the present invention is not limited to this, and the independent pad portion may be defined as extending from the first source electrode 153 or electrically connected to the first source electrode 153.

In addition, the second connection line 482 is connected to the first source electrode 153 and extends from the top surface of the adjacent island substrate 111 to the top surface of the lower substrate 110. In this way, the second connection line 482 can be electrically connected to the data pad formed on each adjacent island substrate 111. The second connection line 482 is in contact with the lower substrate 110 between the island substrates 111.

The material of the second connection line 482 may be the same as the material of the data pad, that is, the material of the first source electrode 153 is the same. In this way, the second connection line 482, the first source 153, and the first drain 154 can be simultaneously formed in the same manufacturing process. In this way, the second connection line 482 can be integrally formed by extending from the first source electrode 153. However, the present invention is not limited to this, and the material of the second connection line 482 and the first source electrode 153 may be different, and they may be electrically connected to each other and arranged on different layers.

In the stretchable display device 400 according to another embodiment of the present invention, the connection lines 480 such as the first connection line 481 and the second connection line 482 are electrically connected to the formed on the island substrate 111 The pad may have the same material as at least one of the plurality of conductive components provided on the island substrate 111. For example, the material of the first connection line 481 can be the same as the material of the first gate 151, and the material of the second connection line 482 can be the same as the material of the first source 153. However, the present invention is not limited to this, and the material of the connection line 480 can be the same as the following components: the first drain electrode 154 except the first gate electrode 151 and the first source electrode 153, organic materials such as the anode 161 and the cathode 163 The electrodes of the light-emitting element 160 and various circuits included in the stretchable display device 400. In this way, the connecting lines 480 can be formed at the same time during the manufacturing process of the conductive components provided on the island substrate 111, wherein these conductive components are connected to the connecting lines in the stretchable display device 400 according to another embodiment of the present invention. 480 has the same material. Therefore, there is no need for a separate manufacturing process to form the connection line 480.

At the same time, a conductive reinforcing member can be provided above or below the predetermined area of the connection line 480 in FIGS. 4 and 5. The conductive reinforcement is a component that prevents damage or cutting of the connection line when the stretchable display device 400 is repeatedly stretched, and is in contact with the connection line to assist in transmitting electrical signals even when the connection line is cut.

The conductive reinforcement may be a conductive polymer containing a base polymer and conductive particles, wherein the conductive particles are uniformly distributed in the base polymer. Since the base polymer has the property of being easily stretched, the conductive reinforcement can have flexibility.

The base polymer is a base layer body in which conductive particles may be distributed, and may include styrene butadiene styrene, but is not limited thereto. In addition, the conductive particles having conductivity may include at least one of silver, gold, and carbon.

The conductive reinforcement may be disposed above or below the connection line 480 and adjacent to one side of the island substrate 111. For example, the conductive stiffener may be in contact with the bottom of the connecting circuit 480 and the side of the island substrate 111, or in contact with the top surface of the connecting circuit 480 and the side of the island substrate 111.

Due to the thickness of the various components provided on the island substrate 111, there may be a step difference between the connection line 480 provided on the island substrate 111 and the connection line 480 provided on the lower substrate 110. At this time, a conductive stiffener containing a flexible base polymer can be arranged above or below the connecting circuit 480 to minimize the damage that may be applied to the connecting circuit 480, wherein the conductive stiffener is arranged on the connecting circuit 480 The upper or lower side is in contact with or adjacent to the side of the island substrate 111.

In addition, when the conductive reinforcement is disposed between the connection line 480 and the lower substrate 110, the adhesion between the connection line 480 and the lower substrate 110 can be increased, and the separation of the connection line 480 from the lower substrate 110 can be suppressed.

In addition, when the conductive reinforcement is provided on the connection line 480, it is before the upper substrate 120 and the polarizing layer 190 are joined together by the adhesive layer 118, and after all the connection lines 480 and various components on the island substrate 111 are formed. , The conductive reinforcement can be formed on the connection line 480. In this way, the conductive reinforcement can be manufactured more easily, and the manufacturing time or cost can be minimized.

Meanwhile, the conductive reinforcement may include liquid metal. The liquid metal here refers to metal that is liquid at room temperature. For example, the liquid metal may include at least one of gallium, indium, sodium, lithium, and alloys of the above four, but it is not limited thereto. When a crack occurs in the connection line 480, the liquid metal can fill the crack in the connection line 480. In this way, because the conductive stiffener contains liquid metal, when the stretchable display device 400 is deformed such as bending or stretching and a crack is generated in the connection line 480, the crack can be filled with liquid metal, thereby minimizing the connection line 480 possibility of disconnection. In addition, the liquid metal has conductivity, so the total resistance of the connection line 480 and the liquid metal can be reduced. In this way, it has the effect of smoothly sending electrical signals between the pads on the island substrate 111.

At the same time, the conductive reinforcement may be provided in the peak area of the connection line 480. The peak area of the connecting line 480 here refers to the area with the largest amplitude in the bent connecting line 480. For example, when the connecting line 480 has a sine wave-like shape, the point with the largest amplitude in the connecting line 480 is defined as the peak area. Compared with other areas of the connecting line 480, when the stretchable display device 400 deforms like bending or stretching, more concentrated stress may be generated in the peak area of the connecting line 480. For example, the top and bottom regions of the bent connection line 480 may be peak regions.

At this time, the conductive reinforcement may be provided on the inner edge of the peak area of the connection line 480. Here, the inner edge of the peak area of the connecting line 480 refers to the area with a relatively small radius of curvature in the peak area, and the outer edge of the peak area of the connecting line 480 refers to the area with a relatively large radius of curvature in the peak area. area. At this time, the conductive reinforcing member may be disposed on the outer edge of the peak area of the connection line 480, and located below or above the connection line 480.

When the stretchable display device 400 is deformed such as bending or stretching, damages such as cracking or breaking may easily occur in the peak area of the connecting line 480, especially compared to other areas. The inner edge of the peak area is more prone to the above-mentioned damage. At this time, even if damage occurs in the peak area or the inner edge of the peak area of the connecting line 480, because the conductive reinforcement can suppress the blocking of the electrical signal, the electrical performance can be stably performed in the stretchable display device 400 Sending of signals.

>Additional sub-pixels>

FIG. 6 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. FIG. 7A is a schematic cross-sectional view of the stretchable display device of FIG. 6. FIG. 7B is a schematic cross-sectional view when the stretchable display device of FIG. 7A is stretched. The substantial difference between the stretchable display device 600 shown in FIG. 6 and the stretchable display device 100 shown in FIGS. 1 to 3 is only the shape of the lower substrate 610 and the additional pixels provided on the lower substrate 610 The APX and the connection line 680 are changed, so the similarities will not be repeated.

Referring to FIG. 6, a first area A1, a second area A2, and a third area A3 are defined on the lower substrate 610 of the stretchable display device 600, wherein a plurality of island substrates 111 are provided in the plurality of first areas A1 , The first connection line 681 and the second connection line 682 belonging to the connection line 680 are provided in the plurality of second areas A2, and are defined in the plurality of third areas A3 except the first area A1 and the second area A2 A plurality of additional sub-pixels ASPX1, ASPX2, ASPX3 included in the additional pixel APX.

Referring to FIGS. 6 and 7A, the plurality of first regions A1 provided with the plurality of island substrates 111 are regions with rigidity. A plurality of first regions A1 separated from each other are defined on the lower substrate 610. For example, as shown in FIG. 6, a plurality of first regions A1 may be arranged in a matrix shape on the lower substrate 610, but it is not limited to this.

Referring to FIG. 7A, the top surface of the first area A1 of the lower substrate 610 is flat. In other words, the first area A1 of the lower substrate 610 does not have curvature or unevenness, so the plurality of island substrates 111 provided on the first area A1 of the lower substrate 610 may also be flat.

Referring to FIGS. 6 and 7A, the organic light emitting element 160 is arranged in each first area A1 to correspond to the sub-pixels SPX1, SPX2, and SPX3 of the pixel PX, respectively. In detail, the first organic light emitting element emitting red light may be disposed on the first sub-pixel SPX1, the second organic light emitting element emitting green light may be disposed on the second subpixel SPX2, and the third organic light emitting element emitting blue light may be disposed on the second subpixel SPX2. The element may be arranged on the third sub-pixel SPX3. In addition, a fourth organic light emitting element emitting white light may be additionally provided. In this way, the first area A1 can be referred to as a first light-emitting area or a first opening area.

Please refer to FIG. 6, a second area A2 is defined adjacent to the first area A1. In detail, the second area A2 is located between two adjacent first areas A1. In this way, as shown in FIG. 6, the first area A1 can be defined as being on the upper, lower, left, and right sides of the second area A2. The second area A2 where the first connection line 681 and the second connection line 682 belonging to the connection line 680 are provided is a flexible area. In other words, the first connection line 681 and the second connection line 682 connected to the pads of the adjacent island substrate 111 are disposed in the second area A2. A plurality of second regions A2 separated from each other are defined on the lower substrate 610. For example, as shown in FIG. 6, a plurality of second areas A2 may be arranged in a matrix shape on the lower substrate 610, but it is not limited to this. Meanwhile, the second area A2 may be referred to as a line area in this specification.

Referring to FIG. 7A, the top surface of the second area A2 of the lower substrate 610 has an uneven shape. In other words, the cross-section of the top surface of the second area A2 of the lower substrate 610 may have a curved shape. In this way, the second connection line 682 provided on the second area A2 of the lower substrate 610 can also correspond to the uneven shape of the top surface of the second area A2. In this way, the cross section of the second connecting line 682 has an uneven shape such as a sine wave, for example. In addition, although not shown in FIG. 7A, the first connection line 681 can also correspond to the uneven shape of the top surface of the second area A2.

Referring to FIG. 6, a third area A3 is defined in the part surrounded by the first area A1 and the second area A2. Referring to FIG. 6, the second area A2 is defined as being on the upper, lower, left and right sides of the third area A3, and the first area A1 is defined as four diagonal directions adjacent to the third area A3.

The additional organic light emitting element 660' may be disposed in each third area A3 to correspond to a plurality of additional sub-pixels ASPX1, ASPX2, ASPX3, respectively. In detail, the first additional organic light emitting element emitting red light is arranged on the first additional sub-pixel ASPX1, the second additional organic light emitting element emitting green light is arranged on the second additional sub-pixel ASPX2, and the third additional organic light emitting element emitting blue light is arranged on the second additional sub-pixel ASPX2. The additional organic light emitting element is disposed on the third additional sub-pixel ASPX3. In this way, the third area A3 can be referred to as a second light-emitting area or a second opening area.

Referring to FIG. 7A, the top surface of the third area A3 of the lower substrate 610 has an uneven shape. That is, the cross section of the top surface of the third area A3 of the lower substrate 610 has a curved shape. Therefore, the additional organic light emitting element 660' disposed on the third area A3 of the lower substrate 610 can also correspond to the uneven shape of the top surface of the third area A3. As such, the additional anode 661', the additional organic light emitting layer 662', and the additional cathode 663' of the additional organic light emitting element 660' may have an uneven shape corresponding to the third area A3 of the lower substrate 610. Meanwhile, the third area A3 may be referred to as a second light-emitting area in this specification.

Please refer to FIG. 6 and FIG. 7A, the connection line 680 is provided on the lower substrate 610. In detail, the connection line 680 may include a first connection line 681, a second connection line 682, a third connection line 683, and a fourth connection line 684. The first connection line 681 and the second connection line 682 are connected to the pads of the adjacent island substrate 111. The third connection line 683 is connected to the anode 161 of the organic light emitting element 160 and the additional anode 661' of the additional organic light emitting element 660'. The anode 161 is provided in the sub-pixels SPX1, SPX2, SPX3 of the first area A1. The additional anode 661' is disposed in the additional sub-pixels ASPX1, ASPX2, ASPX3 in the third area A3. The fourth connection line 684 is connected to the cathode 163 of the organic light emitting element 160 in the first area A1 and the additional cathode 663' of the additional organic light emitting element 660' in the third area A3.

6 and 7A, the first connection line 681 and the second connection line 682 in the second area A2 can be connected to the pad portion of the island substrate 111 disposed in the adjacent first area A1. As shown in FIG. 7B, the first connection line 681 extends and is arranged along the X-axis direction, and the second connection line 682 is extended and arranged along the Y-axis direction.

6 and 7A, the third connection line 683 can be connected to the anode 161 provided in the first area A1 and the additional anode 661' provided in the third area A3. In this way, the material of the third connection line 683 can be the same as the material of the anode 161 and the additional anode 661'. For example, the third connection line 683, the anode 161 of the organic light emitting element 160, and the additional anode 661' of the additional organic light emitting element 660' may have the same material, so they may be integrally formed. However, the present invention is not limited to this. The material of the third connection line 683 can be different from the material of the anode 161 and the additional anode 661', and the manufacturing process of the third connection line 683 can be different from the anode 161 and the additional anode 661' The manufacturing process. For example, the material of the third connection line 683 may be the same as the material of any one of the first gate 151, the first source 153, and the first drain 154 of the first transistor 150.

At the same time, the third connection line 683 can be connected to the additional organic light-emitting element 660' of the additional sub-pixels ASPX1, ASPX2, and ASPX3. The organic light emitting element 160 emits light of the same color. That is, the third connection line 683 may be connected to the anode of the first organic light-emitting element of the first sub-pixel SPX1 that emits red light and the additional anode of the first additional organic light-emitting element of the first additional sub-pixel ASPX1 that emits red light. . Furthermore, the third connection line 683 may be connected to the anode of the second organic light emitting element of the second subpixel SPX2 emitting green light and the additional anode of the second additional organic light emitting element of the second additional subpixel ASPX2 emitting green light. In addition, the third connection line 683 may be connected to the anode of the third organic light emitting element of the third subpixel SPX3 emitting blue light and the additional anode of the third additional organic light emitting element of the third additional subpixel ASPX3 emitting blue light. In this way, when any one of the sub-pixels SPX1, SPX2, SPX3 emits light, the additional sub-pixels ASPX1, ASPX2, and ASPX3 that emit light of the same color can emit light together.

The third connection line 683 is formed by extending from the top surface of the planarization layer 115 to the top surface of the lower substrate 610, and the third connection line 683 contacts the island substrate 111, the buffer layer 112, the interlayer insulating layer 114, and the planarization layer. The side of layer 115. In addition, the third connection line 683 contacts the lower substrate 610 between the island substrate 111 and the additional sub-pixels ASPX1, ASPX2, ASPX3.

Referring to FIG. 7A, the bank 616 provided on the island substrate 111 extends to a partial area on the additional anode 661' of the additional organic light emitting element 660' provided on the third area A3. In detail, the bank 616 is arranged to cover only a part of the area on the additional anode 661' of the additional organic light emitting element 660' arranged on the third area A3. In this way, the bank 616 can play a role in suppressing the short-circuit of the additional anode 661' and the additional cathode 663' in the additional organic light emitting element 660'.

Referring to FIG. 7A, the additional organic light emitting layer 662' is disposed on the additional anode 661' of the additional organic light emitting element 660'. The additional organic light emitting layer 662' may have an uneven shape to correspond to the additional anode 661' having an uneven shape in the additional organic light emitting element 660'.

In addition, the organic light-emitting layer 162 of the organic light-emitting element 160 of each sub-pixel SPX1, SPX2, SPX3 and the additional organic light-emitting layer 662 of the additional organic light-emitting element 660' of each additional sub-pixel ASPX1, ASPX2, ASPX3 emitting light of the same color 'Have the same material. The organic light emitting layer of the first organic light emitting element of the first subpixel SPX1 emitting red light and the additional organic light emitting layer of the first additional organic light emitting element of the first additional subpixel ASPX1 emitting red light have the same material. The organic light emitting layer of the second organic light emitting element of the second subpixel SPX2 emitting green light and the additional organic light emitting layer of the second additional organic light emitting element of the second additional subpixel ASPX2 emitting green light have the same material. The organic light emitting layer of the third organic light emitting element of the third subpixel SPX3 emitting blue light and the additional organic light emitting layer of the third additional organic light emitting element of the third additional subpixel ASPX3 emitting blue light have the same material.

Referring to FIG. 7A, the additional cathode 663' is disposed on the additional organic light emitting layer 662' of the additional organic light emitting element 660'. The additional cathode 663' may be formed by patterning so that the additional cathode 663' overlaps each lower substrate 610 in the third area A3. At this time, the additional cathode 663' can be provided as a single cathode on the additional sub-pixels ASPX1, ASPX2, ASPX3. Here, the additional cathode 663' has an uneven shape to correspond to the additional anode 661' having an uneven shape in the additional organic light emitting element 660'.

Meanwhile, the fourth connection line 684 may be connected to the cathode 163 disposed in the first area A1 and the additional cathode 663' disposed in the third area A3. In this way, the material of the fourth connection line 684 can be the same as the material of the cathode 163 and the additional cathode 663'. For example, as shown in FIG. 6, the fourth connection line 684, the cathode 163 of the organic light emitting element 160, and the additional cathode 663' of the additional organic light emitting element 660' may have the same material at the same time, so they may be integrally formed. However, the fourth connection line 684 is not limited to this. The material of the fourth connection line 684 may be different from the material of the cathode 163 and the additional cathode 663', and the fourth connection line 684 can be manufactured through an independent process.

Referring to FIG. 7B, when the stretchable display device 600 is stretched, the connection line 680 and the lower substrate 610 can be stretched together. For example, when the lower substrate 610 is stretched, the second connection lines 682 and the third connection lines 683 that were originally formed in the second area A2 and the third area A3 with uneven shapes may become linear shapes when stretched. .

In addition, referring to FIG. 7B, when the stretchable display device 600 is stretched, the additional organic light emitting element 660' may be stretched together with the lower substrate 610. In detail, the extra anode 661', the extra organic light emitting layer 662', and the extra cathode 663' which originally have a curved shape in the extra organic light emitting element 660' may become linear shapes when stretched.

Generally speaking, when the stretchable display device is bent or stretched, the lower substrate composed of the flexible substrate will deform, while the island substrate with a rigid substrate and provided with organic light emitting elements will not deform. In this case, if the material of the wires connected to the pads provided on the island substrate is not a material that can be easily bent or stretched, the wires may be subject to cracks such as cracks due to the deformation of the lower substrate. damage.

Therefore, the additional pixels APX are provided in the portion of the lower substrate 610 that is not used as a dummy. That is, in the stretchable display device 600 according to another embodiment of the present invention, the third area A3 is provided in addition to There are areas other than the first area A1 of the island substrate 111 and the second area A2 where the connection line 680 is provided. In this way, this area of the stretchable display device 600 can be effectively used, and the aperture ratio of the stretchable display device 600 can also be increased. For example, as shown in FIG. 6, when the additional pixels APX are provided in the stretchable display device 600, the aperture ratio can be doubled. In this way, the illuminance of the stretchable display device 600 according to another embodiment of the present invention can also be improved.

In addition, in the stretchable display device 600 according to another embodiment of the present invention, the pixels PX and the additional pixels APX share the first transistor 150 provided on the island substrate 111. That is, when the first transistor 150 is driven, the organic light emitting element 160 and the additional organic light emitting element 660' connected to the same first transistor 150 can be driven. In this way, in the stretchable display device 600 according to another embodiment of the present invention, the organic light-emitting element 160 and the additional organic light-emitting element 660' share a first transistor 150 provided on the island substrate 111, so that The aperture ratio of the stretchable display device 600 can be increased without adding independent circuit components.

In addition, in the stretchable display device 600 according to another embodiment of the present invention, by forming additional pixels APX in the third area A3, even when the stretchable display device 600 is stretched, the stretchable The image quality of the display device 600 has deteriorated. That is, when the additional pixels APX are not used, only the pixels PX provided on the island substrate 111 emit light, and when the stretchable display device 600 is stretched, it will emit light in the region between the island substrates 111. Is stretched. As a result, the gap between the island substrates 111 may increase compared to before stretching. As a result, when the stretchable display device 600 is stretched, the image quality of the stretchable display device 600 is degraded. In this way, in the stretchable display device 600 according to another embodiment of the present invention, by arranging the additional pixels APX in the third area A3, the stretchable display device 600 can maintain light emission even if the stretchable display device 600 is stretched. The gap between regions. In this way, in the stretchable display device 600 according to another embodiment of the present invention, when the stretchable display device 600 is stretched, the deterioration of the image quality of the stretchable display device 600 can still be minimized.

In addition, in the stretchable display device 600 according to another embodiment of the present invention, the additional organic light emitting element 660' may have a curved shape in a state between being stretched. That is, due to the uneven shape of the lower substrate 610 disposed under the additional organic light-emitting element 660', the additional organic light-emitting element 660' may also have an uneven shape, so the optical of the additional organic light-emitting element 660' can be improved. Extraction efficiency (optical extraction efficiency).

In addition, in the stretchable display device 600 according to another embodiment of the present invention, the top surfaces of the second area A2 and the third area A3 where the connection line 680 and the additional pixels APX are provided in the lower substrate 610 have uneven shape. In this way, the stress generated when the stretchable display device 600 is stretched is attenuated. That is, the shape of the additional organic light emitting element 660' and the connection line 680 disposed in the additional pixel APX corresponds to the uneven shape of the top surfaces of the second area A2 and the third area A3 of the lower substrate 610. In this way, when the stretchable display device 600 is stretched, the connection line 680 and the additional organic light emitting element 660' can be stretched easily. In addition, by attenuating the stress that may be generated in the connection line 680 and the additional organic light emitting element 660', the damage of the connection line 680 and the additional organic light emitting element 660' can be minimized, and the increase of the resistance of the connection line 680 can be minimized.

Meanwhile, although not shown in FIGS. 6 to 7B, the lower substrate 610, the upper substrate 120, and the polarizing layer 190 of the stretchable display device 600 may include rigid patterns and flexible patterns. In this regard, the flexible pattern can also be referred to as a flexible pattern. For example, the lower substrate 610 may include a rigid pattern provided on an area overlapping with the island substrate 111, and a flexible pattern provided on an area where the rigid pattern is not provided. Here, the rigid pattern is a pattern that has a higher modulus and is relatively rigid than a flexible pattern, and may have the same modulus as the island substrate 111. In addition, the upper substrate 120 and the polarizing layer 190 may include a rigid pattern provided on an area overlapping with the island substrate 111, and a flexible pattern provided on an area not provided with a rigid pattern. In this way, the lower substrate 610, the upper substrate 120, and the polarizing layer 190 located in the area overlapping the island substrate 111 have rigidity, while the lower substrate 610, the lower substrate 610 located in the area not overlapping the island substrate 111, The upper substrate 120 and the polarizing layer 190 have flexibility. Therefore, when the stretchable display device 600 is stretched, only the region that does not overlap the island substrate 111 can be stretched.

>Extra pixels driven independently from the pixels>

FIG. 8 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of the stretchable display device of FIG. 8. The essential difference between the stretchable display device 800 shown in FIGS. 8 and 9 and the stretchable display device 600 shown in FIGS. 6 to 7B is that the stretchable display device 800 adds a second transistor 850' Therefore, the similarities will not be repeated.

Referring to FIGS. 8 and 9, a second transistor 850' is formed on the buffer layer 112, and the second transistor 850' includes a second gate 851', a second active layer 852', and a second source Pole 853' and a second drain pole 854'. For example, a second active layer 852' is formed on the buffer layer 112, and a gate insulating layer 113 is formed on the second active layer 852' to insulate the second active layer 852' and the second gate 851' from each other. Forming an interlayer insulating layer 114 to insulate the second gate electrode 851', the second source electrode 853' and the second drain electrode 854', and forming the second source electrode 853' and the second drain electrode 854' on the interlayer insulating layer 114, The second source 853' and the second drain 854' respectively contact the second active layer 852'.

In addition, a planarization layer 115 is formed on the first transistor 150, the second transistor 850', and the interlayer insulating layer 114. The planarization layer 115 planarizes the tops of the first transistor 150 and the second transistor 850'. The planarization layer 115 may have a contact hole for electrically connecting to the first transistor 150 and the anode 161, a contact hole for electrically connecting to the data pad 173 and the first source electrode 153, and a contact hole for electrically connecting to the second drain electrode. A contact hole between the pole 854' and the third connection line 883.

In some embodiments, a passivation layer may be formed between the first transistor 150, the second transistor 850' and the planarization layer 115. In other words, a passivation layer covering the first transistor 150 and the second transistor 850' can be formed, so as to protect the first transistor 150 and the second transistor 850' from penetration by moisture, oxidation, etc. The material of the passivation layer can be an inorganic material, and the passivation layer can be a single-layer or multi-layer structure, but it is not limited thereto.

Referring to FIG. 9, the additional organic light emitting element 660' connected to the second transistor 850' through the third connecting line 883 is disposed in the third area A3 of the lower substrate 610. The organic light emitting element 160 and the additional organic light emitting element 660' provided on the island substrate 111 are respectively connected to different transistors, so they can be driven independently.

The additional sub-pixels ASPX1, ASPX2, and ASPX3 of the stretchable display device 800 according to another embodiment of the present invention are connected to circuits other than the sub-pixels SPX1, SPX2, and SPX3 provided on the island substrate 111. In this way, in the stretchable display device 800 according to another embodiment of the present invention, because the additional sub-pixels ASPX1, ASPX2, ASPX3 and the sub-pixels SPX1, SPX2, SPX3 are independently driven, the resolution can be increased. . For example, as shown in FIG. 8, when the additional pixels APX are provided in the stretchable display device 800, the resolution can be doubled.

>Flexible encapsulation layer>

FIG. 10 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. FIG. 11 is a schematic cross-sectional view of the stretchable display device of FIG. 10. 12 is a schematic cross-sectional view of a stretchable display device according to another embodiment of the invention. The essential difference between the stretchable display device 1000 shown in FIGS. 10 and 11 and the stretchable display device 600 shown in FIGS. 6 to 7B is only that the stretchable display device 1000 has a different encapsulation layer 1017 Therefore, the similarities will not be repeated. In addition, the essential difference between the stretchable display device 1200 shown in FIG. 12 and the stretchable display device 800 shown in FIG. 8 to FIG. 6 is only that the stretchable display device 1200 has a different encapsulation layer 1017. The similarities are not repeated here.

First, referring to FIG. 10 and FIG. 11, an encapsulation layer 1017 includes a plurality of first encapsulation layers 1017a and a plurality of second encapsulation layers 1017b, wherein the first encapsulation layer 1017a is disposed on the organic light emitting element disposed in the first area A1 160, and the second encapsulation layer 1017b is disposed on the connection line 680 and the additional organic light emitting element 660' respectively disposed in the second area A2 and the third area A3. The first encapsulation layer 1017a can seal the organic light emitting element 160 by covering the organic light emitting element 160, wherein the organic light emitting element 160 is in contact with a part of the top surface of a bank 116. In addition, the second encapsulation layer 1017b can cover the connection line 680 provided in the second area A2 and the additional organic light emitting element 660' provided in the third area A3. However, the present invention is not limited to this. For example, the second encapsulation layer 1017b may not be disposed in the second area A2 to minimize damage to the encapsulation layer 1017 when the stretchable display device 1000 is deformed.

The material of the encapsulation layer 1017 can be flexible, has excellent elasticity, and can prevent the organic light emitting element 160 and the additional organic light emitting element 660' from being affected by water and air that may penetrate from the outside. In other words, the material of the packaging layer 1017 can be a soft or flexible packaging material. For example, the material of the encapsulation layer 1017 may be graphene. Graphene is a material in which carbon atoms form a honeycomb structure in a plane. It is very thin, transparent, and has excellent elasticity. In addition, the material of the encapsulation layer 1017 may be graphene oxide (GO) or reduced graphene oxide (rGO). However, the encapsulation layer 1017 is not limited to this, as long as it has excellent elasticity and can prevent the organic light-emitting element 160 and the additional organic light-emitting element 660' from being affected by moisture, air, etc., various materials can be used for the encapsulation layer. 1017.

In addition, please refer to FIG. 12, which is the same as the stretchable display device 1000 described in FIG. 10 and FIG. 11 in that it is flexible, has excellent elasticity, and can prevent the organic light emitting element 160 and the additional organic light emitting element 660' from being The encapsulation layer 1017, which is affected by water and air that may penetrate from the outside, can also be used in the stretchable display device 1200.

In the stretchable display devices 1000 and 1200 according to other embodiments of the present invention, the formed encapsulation layer 1017 is flexible, has excellent elasticity, and can prevent the organic light-emitting element 160 and the additional organic light-emitting element 660' It is affected by the water and air that may penetrate from the outside. In this way, when the stretchable display devices 1000 and 1200 are stretched, damage such as cracking of the packaging layer 1017 can be effectively suppressed. In addition, because the second encapsulation layer 1017b inhibits moisture or oxygen from damaging the additional organic light-emitting element 660', the reliability of the additional organic light-emitting element 660' can be improved.

In addition, in the stretchable display devices 1000 and 1200 according to some embodiments of the present invention, since the encapsulation layer 1017 is not formed between the island substrates 111, even if the encapsulation layer 1017 is not formed between the island substrates 111, even according to some embodiments of the present invention, The stretched display devices 1000 and 1200 undergo deformation such as bending or stretching, and damage to the packaging layer 1017 can still be minimized.

>Light-emitting diodes set on the sub-pixels>

At the same time, as described above, the stretchable display device according to an embodiment of the present invention is described by taking an organic light-emitting element as an example of the light-emitting element. However, the light-emitting element of the stretchable display device 1300 may include a light-emitting diode. Hereinafter, the structure of the sub-pixel will be described in the case where the light-emitting element included in the stretchable display device 1300 according to an embodiment of the present invention is a light-emitting diode.

13A is a schematic cross-sectional view of a sub-pixel of a stretchable display device according to another embodiment of the invention. FIG. 13B is a schematic cross-sectional view of the stretchable display device of FIG. 13A when it is stretched. The substantial difference between the stretchable display device 1300 shown in FIGS. 13A and 13B and the stretchable display device 600 shown in FIGS. 7A and 7B is only that the light-emitting element is a light-emitting diode 1360 and therefore the same I will not repeat it here.

Referring to FIG. 13A, a common circuit CL is provided on the gate insulating layer 113. The common line CL is a line that provides a common voltage to the sub-pixel SPX. The material of the common line CL can be the same as the material of the first gate 151 of the first transistor 150, but is not limited to this.

A first connection pad 1381 and a second connection pad 1383 are disposed on the planarization layer 115.

The first connection pad 1381 is electrically connected to the first transistor 150 and the light emitting diode 1360. The first connection pad 1381 is connected to the first drain electrode 154 of the first transistor 150 through the contact hole formed in the planarization layer 115. However, the first connection pad 1381 is not limited to this, and the first connection pad 1381 can be connected to the first source 153 of the first transistor 150 depending on the type of the first transistor 150. In this way, the P electrode 1365 of the light emitting diode 1360 can be electrically connected to the first drain electrode 154 of the first transistor 150 through the first connection pad 1381.

The second connection pad 1383 is electrically connected to the light emitting diode 1360 and the common line CL. In detail, the second connection pad 1383 is connected to the common line CL through the contact hole formed in the planarization layer 115 and the interlayer insulating layer 114. In this way, the common line CL can be electrically connected to the N pole 1364 of the light emitting diode 1360 through the second connection pad 1383.

The light emitting diode 1360 is disposed on the first connection pad 1381 and the second connection pad 1383. The light emitting diode 1360 includes an N-type layer 1361, an active layer 1362, a P-type layer 1363, an N-pole 1364, and a P-pole 1365. According to another embodiment of the present invention, the light emitting diode 1360 of the stretchable display device 1300 has a flip-chip structure, and the N pole 1364 and the P pole 1365 are formed on one surface.

The N-type layer 1361 may be formed by implanting n-type impurity (n-type impurity) into gallium nitride (GaN) having excellent crystallinity. The N-type layer 1361 may be provided on a separate substrate.

The active layer 1362 is disposed on the N-type layer 1361. The active layer 1362 is a light emitting layer that emits light in the light emitting diode 1360, and the material of the active layer 1362 can be, for example, a nitride semiconductor such as indium gallium nitride (InGaN). The P-type layer 1363 is disposed on the active layer 1362. The P-type layer 1363 can be formed by implanting P-type impurities into gallium oxide.

As described above, the light emitting diode 1360 according to an embodiment of the present invention is to sequentially stack the N-type layer 1361, the active layer 1362, and the P-type layer 1363, etch a predetermined portion, and then form the N-pole 1364 and the P-type layer 1363. Pole 1365 is manufactured in this way. In this process, the so-called "predetermined part" is used to separate the space between the N pole 1364 and the P electrode 1365, and this "predetermined part" is etched to expose a part of the N-type layer 1361. In other words, the surface where the N pole 1364 and the P pole 1365 are expected to be provided in the light emitting diode 1360 is not a flat surface and has different height levels.

The N pole 1364 is disposed in the etching area. In other words, the N-type layer 1361 is exposed to the outside through the etching process as described above. The material of the N pole 1364 can be a conductive material. At the same time, the P pole 1365 is disposed in the non-etched area, that is, the P-type layer 1363. The material of the P pole 1365 may also be a conductive material, and for example, the material of the N pole 1364 is the same.

Because the adhesive layer AD is disposed on the top surfaces of the first connection pad 1381 and the second connection pad 1383, and is interposed between the first connection pad 1381 and the second connection pad 1383, the light emitting diode 1360 can be bonded to the first connection pad 1383. A connection pad 1381 and a second connection pad 1383. In this configuration, the N pole 1364 can be provided on the second connection pad 1383, and the P pole 1365 can be provided on the first connection pad 1381.

The adhesive layer AD may be a conductive adhesive layer in which conductive balls are distributed in an insulating substrate. In this way, when heat or pressure is applied to the adhesive layer AD, because the conductive ball is electrically connected to the part where the heat or pressure is applied, this part can have conductive properties. In addition, the non-pressurized area may have insulating properties. For example, the N pole 1364 is electrically connected to the second connection pad 1383 through the adhesive layer AD, and the P pole 1365 is electrically connected to the first connection pad 1381 through the adhesive layer AD. In other words, the adhesive layer AD can be applied to the first connection pad 1381 and the second connection pad 1383 through methods such as inkjet, and the light-emitting diode 1360 on the adhesive layer AD can be moved and then the light-emitting diode 1360 presses and heats the method to electrically connect the first connection pad 1381 to the P pole 1365 and the second connection pad 1383 to the N pole 1364. However, the other parts of the adhesive layer AD that are not disposed between the N electrode 1364 and the second connection pad 1383 and the parts of the adhesion layer AD disposed between the P electrode 1365 and the first connection pad 1381 have insulating properties. At the same time, the adhesive layer AD can be arranged on each of the first connection pad 1381 and the second connection pad 1383 in an independent manner.

As described above, in the stretchable display device 1300 according to another embodiment of the present invention, because the stretchable display device 1300 has a light emitting diode 1360 on the lower substrate 110 where the first transistor 150 is disposed Therefore, when the stretchable display device 1300 is turned on, the voltages applied to the first connection pad 1381 and the second connection pad 1383 at different levels will be transmitted to the N pole 1364 and the P pole 1365, respectively, so that The light-emitting diode 1360 emits light.

On the other hand, referring to FIG. 13B, when the stretchable display device 1300 is stretched, the second connection line 682 and the third connection line 683 can be stretched together with the lower substrate 610. For example, when the lower substrate 610 is stretched, the second connection lines 682 and the third connection lines 683 formed with non-uniform shapes in the second area A2 and the third area A3 may become linear shapes during stretching .

In addition, referring to FIG. 13B, when the stretchable display device 600 is stretched, the additional organic light emitting element 660' can be stretched together with the lower substrate 610. In detail, the additional anode 661', the additional organic light-emitting layer 662' and the additional cathode 663' having a curved shape in the additional organic light-emitting element 660' may become linear shapes when stretched.

As described above, in the stretchable display device 1300 according to another embodiment of the present invention, the light-emitting element may be a light-emitting diode 1360. Because the material of the light-emitting diode 1360 is an inorganic material instead of an organic material, it is highly reliable. Therefore, the service life of the light-emitting diode 1360 is longer than that of a liquid crystal display element or an organic light-emitting element. In addition, the light-emitting diode 1360 starts quickly, consumes a small amount of power, has high stability due to its high impact resistance, and can display high-illuminance images due to its high emission efficiency. In this way, the light-emitting diode 1360 is suitable for use in very large screens. In particular, because the material of the light-emitting diode 1360 is an inorganic material instead of an organic material, when an organic light-emitting element is used, an encapsulation layer may not be required. In this way, it is possible to omit the encapsulation layer, which is easily damaged such as cracks when the stretchable display device is stretched. In this way, the light emitting diode 1360 can be used as a light emitting element in a stretchable display device, and the encapsulation layer is omitted, which is easy to be bent or stretched in the stretchable display device of another embodiment of the present invention. Components that suffer damage such as cracks when they are deformed. In addition, because the material of the light-emitting diode 1360 is an inorganic material instead of an organic material, the light-emitting element of the stretchable display device according to another embodiment of the present invention can be protected from moisture or oxygen, and can be Have excellent reliability.

>Light-emitting diodes set on additional pixels>

As described above, it has been exemplified that in the stretchable display device according to another embodiment of the present invention, the organic light-emitting element is disposed on the additional sub-pixels. However, in the stretchable display device 1400, the light-emitting element disposed on the additional sub-pixel may include a light-emitting diode. Next, a description will be given of the case where the light-emitting element provided on the additional sub-pixel is a light-emitting diode in a stretchable display device 1400 according to another embodiment of the present invention.

14A is a schematic cross-sectional view of a sub-pixel of a stretchable display device according to another embodiment of the invention. FIG. 14B is a schematic cross-sectional view when the stretchable display device of FIG. 14B is stretched. The substantial difference between the stretchable display device 1400 shown in FIGS. 14A and 14B and the stretchable display device 1300 shown in FIGS. 13A and 13B is only that the light-emitting elements provided in the additional sub-pixels are additional Therefore, the similarities of the light emitting diode 1460 will not be repeated.

Please refer to FIG. 14A, an additional island substrate 1411 may be disposed on the portion of the lower substrate 610 located in the third area A3. In other words, the additional island substrate 1411 and the island substrate 111 are separated in the same layer of the lower substrate 610, and the island substrate 111 is disposed in the first area A1. In addition, the top surface and the bottom surface of the additional island substrate 1411 may be flat, and the top surface of the portion of the lower substrate 610 that contacts the additional island substrate 1411 may also be flat.

In addition, the additional island substrate 1411 is a component for installing the additional light emitting diode 1460, and compared to the lower substrate 610, the additional island substrate 1411 can be more rigid. In other words, the lower substrate 610 may be softer than the additional island substrate 1411, and the additional island substrate 1411 may be more rigid than the lower substrate 610.

The additional island substrate 1411 is a rigid substrate, and its material can be a flexible plastic material, where the flexible plastic material can be, for example, polyimide, polyacrylate, polyvinyl acetate, etc.

The modulus of the additional island substrate 1411 may be higher than the modulus of the lower substrate 610. This modulus is the modulus of elasticity, which represents the ratio of the amount of deformation caused by the stress on the substrate to the stress applied to the substrate, and the higher the modulus, the higher the hardness. In this way, the additional island substrate 1411 can be a rigid substrate that is stiffer than the lower substrate 610. The modulus of the additional island substrate 1411 may be greater than the modulus of the lower substrate 610, or a thousand times the modulus of the lower substrate 610, but is not limited thereto.

A third connection pad 1481 and a fourth connection pad 1483 are disposed on the additional island substrate 1411.

The third connection pad 1481 is electrically connected to the third connection line 683 and the additional light emitting diode 1460. In detail, the third connection line 683 and the P pole 1465 of the additional light emitting diode 1460 are electrically connected through the third connection pad 1481.

The fourth connection pad 1483 is electrically connected to the additional light emitting diode 1460 and the common line CL. Although not shown in detail in FIG. 14A, the fourth connection pad 1483 is electrically connected to the common line CL, and in the third area A3, the fourth connection pad 1483 is connected to the additional light emitting diode 1460 through the adhesive layer AD. In this way, the common circuit CL of the additional light emitting diode 1460 and the N pole 1464 are electrically connected through the fourth connection pad 1483.

The additional light emitting diode 1460 is disposed on the third connection pad 1481 and the fourth connection pad 1483. The additional light-emitting diode 1460 includes an N-type layer 1461, an active layer 1462, a P-type layer 1463, an N-pole 1464, and a P-pole 1465. The additional light emitting diode 1460 of the stretchable display device 1400 according to another embodiment of the present invention has a flip-chip structure, so that the N pole 1464 and the P pole 1465 are formed on one surface.

The N-type layer 1461 may be formed by implanting N-type impurities into gallium oxide having excellent crystallinity. The N-type layer 1461 may be provided on a separate substrate.

The active layer 1462 is disposed on the N-type layer 1461. The active layer 1462 is a light emitting layer that emits light in the additional light emitting diode 1460, and the material of the active layer 1462 can be, for example, a nitride semiconductor such as indium gallium nitride. The P-type layer 1463 is disposed on the active layer 1462. The P-type layer 1463 may be formed by implanting P-type impurities into gallium oxide.

As described above, the additional light emitting diode 1460 according to an embodiment of the present invention is to sequentially stack the N-type layer 1461, the active layer 1462, and the P-type layer 1463, etch a predetermined part, and then form the N-pole 1464 and P pole 1465 is manufactured in this way. In this process, the so-called "predetermined portion" is used to separate the space between the N pole 1464 and the P pole 1465, and this "predetermined portion" is etched to expose a part of the N-type layer 1461. In other words, the surface where the N pole 1464 and the P pole 1465 are expected to be provided in the additional light emitting diode 1460 is not a flat surface and has different height levels.

The N pole 1464 is disposed in the etching area. In other words, the N-type layer 1461 is exposed to the outside through the etching process as described above. The material of the N pole 1464 can be a conductive material. At the same time, the P pole 1465 is disposed in the non-etched area, that is, the P-type layer 1463. The material of the P pole 1465 may also be a conductive material, and for example, the material of the N pole 1464 is the same.

Because the adhesive layer AD is disposed on the top surface of the third connection pad 1481 and the fourth connection pad 1483 and is between the third connection pad 1481 and the fourth connection pad 1483, the additional light emitting diode 1460 can be bonded to The third connection pad 1481 and the fourth connection pad 1483. In this configuration, the N pole 1464 can be provided on the fourth connection pad 1483, and the P pole 1465 can be provided on the third connection pad 1481.

The adhesive layer AD may be a conductive adhesive layer in which conductive balls are distributed on an insulating substrate. In this way, when heat or pressure is applied to the adhesive layer AD, because the conductive ball is electrically connected to the part where the heat or pressure is applied, this part can have conductive properties. In addition, the non-pressurized area may have insulating properties. For example, the N pole 1464 is electrically connected to the fourth connection pad 1483 through the adhesive layer AD, and the P pole 1465 is electrically connected to the third connection pad 1481 through the adhesive layer AD. That is to say, the adhesive layer AD can be applied to the third connection pad 1481 and the fourth connection pad 1483 through methods such as inkjet, and the additional light-emitting diode 1460 on the adhesive layer AD can be moved and then the additional light-emitting two The pole body 1460 is pressurized and heated to electrically connect the third connection pad 1481 to the P pole 1465 and the fourth connection pad 1483 to the N pole 1464. However, the other parts of the adhesive layer AD that are not provided between the N pole 1464 and the fourth connection pad 1483 and the parts of the adhesive layer AD that are provided between the P pole 1465 and the third connection pad 1481 have insulating properties. At the same time, the adhesive layer AD can be arranged on each of the third connection pad 1481 and the fourth connection pad 1483 in an independent manner.

As described above, in the stretchable display device 1400 according to another embodiment of the present invention, because the stretchable display device 1400 has an additional light emitting diode 1460 in the third area A3 where the additional sub-pixels are provided. Therefore, when the stretchable display device 1400 is turned on, the voltages applied to the third connection pad 1481 and the fourth connection pad 1483 at different levels will be transmitted to the N pole 1464 and the P pole 1465, respectively, so that The additional light emitting diode 1460 emits light.

On the other hand, referring to FIG. 14B, when the stretchable display device 1400 is stretched, the second connection line 682 and the third connection line 683 can be stretched together with the lower substrate 610. For example, when the lower substrate 610 is stretched, the second connection lines 682 and the third connection lines 683 formed with non-uniform shapes in the second area A2 and the third area A3 may become linear shapes during stretching .

However, even if the stretchable display device 1400 is stretched, the additional island substrate 1411, which is a rigid substrate, will not be stretched. Therefore, the additional light emitting diode 1460 provided on the additional island substrate 1411 will not be stretched. Will be stretched. In this way, since the external force generated by the stretching is not applied to the additional light-emitting diode 1460, the additional light-emitting diode 1460 will not be damaged by stretching the stretchable display device 1400.

As described above, in the stretchable display device 1400 according to another embodiment of the present invention, the additional light emitting diode 1460 may be disposed on the additional sub-pixels. Because the material of the additional light-emitting diode 1460 is an inorganic material instead of an organic material, it has excellent reliability. Therefore, the service life of the additional light-emitting diode 1460 is longer than that of a liquid crystal display element or an organic light-emitting element. In addition, the additional light-emitting diode 1460 starts quickly, consumes a small amount of power, has high stability due to its high impact resistance, and can display high-illuminance images due to its high emission efficiency. In this way, the additional LED 1460 is suitable for application in very large screens. In particular, because the material of the additional light-emitting diode 1460 is an inorganic material instead of an organic material, when an organic light-emitting element is used, it is not necessary to use an encapsulation layer. In this way, it is possible to omit the encapsulation layer, which is easily damaged such as cracks when the stretchable display device is stretched. In this way, the additional light-emitting diode 1460 can be used as the light-emitting element in the stretchable display device, and the encapsulation layer is omitted, which is easy to be bent or bent in the stretchable display device of another embodiment of the present invention. An element that suffers damage such as cracking during deformation such as stretching. In addition, because the material of the additional light-emitting diode 1460 is an inorganic material instead of an organic material, the light-emitting element of the stretchable display device according to another embodiment of the present invention can be protected from moisture or oxygen, and May have excellent reliability.

15 is a schematic cross-sectional view of a sub-pixel of a stretchable display device according to another embodiment of the invention. The substantial difference between the stretchable display device 1500 shown in FIG. 15 and the stretchable display device 1400 shown in FIG. 14A and FIG. 14B is only that the stretchable display device 1500 adds a second transistor 1550' In addition, the similarities are not repeated here.

Referring to FIG. 15, a second transistor 1550' is formed on the buffer layer 112, and the second transistor 1550' includes a second gate 1551', a second active layer 1552', and a second source 1553' And a second drain 1554'. For example, a second active layer 1552' is formed on the buffer layer 112, and a gate insulating layer 113 is formed on the second active layer 1552' to insulate the second active layer 1552' and the second gate 1551' from each other. Forming an interlayer insulating layer 114 to insulate the second gate 1551', the second source 1553', and the second drain 1554', and forming the second source 1553' and the second drain 1554' on the interlayer insulating layer 114, The second source 1553' and the second drain 1554' respectively contact the second active layer 1552'.

In addition, a planarization layer 115 is formed on the first transistor 150, the second transistor 1550' and the interlayer insulating layer 114. The planarization layer 115 planarizes the tops of the first transistor 150 and the second transistor 1550'. The planarization layer 115 may have a contact hole for electrically connecting the first transistor 150 and the first connection pad 1381, a contact hole for electrically connecting the data pad 173 and the first source electrode 153, and a contact hole for electrically connecting to the first transistor 150 and the first source electrode 153. The contact hole between the second drain 1554' and the third connection line 683.

In some embodiments, a passivation layer may be formed between the first transistor 150, the second transistor 1550' and the planarization layer 115. In other words, a passivation layer covering the first transistor 150 and the second transistor 1550' can be formed, so that the first transistor 150 and the second transistor 1550' are protected from the penetration of moisture, oxidation, and the like. The material of the passivation layer can be an inorganic material, and the passivation layer can be a single-layer or multi-layer structure, but it is not limited thereto.

Please refer to FIG. 15, an additional light emitting diode 1460 connected to the second transistor 1550' through the third connection line 683 is disposed in the third area A3 of the lower substrate 610. The additional light emitting diode 1460 provided on the additional island substrate 1411 and the light emitting diode 1360 provided on the island substrate 111 are respectively connected to different transistors, so they can be driven independently.

The additional sub-pixels ASPX1, ASPX2, and ASPX3 of the stretchable display device 1500 according to another embodiment of the present invention are connected to circuits other than the sub-pixels SPX1, SPX2, and SPX3 provided on the island substrate 111. In this way, in the stretchable display device 1500 according to another embodiment of the present invention, because the additional sub-pixels ASPX1, ASPX2, ASPX3 and the sub-pixels SPX1, SPX2, SPX3 are independently driven, the resolution can be increased. .

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

100, 400, 600, 800, 1000, 1200, 1300, 1400, 1500: stretchable display device 110, 610: lower substrate 111: Island substrate 1411: Additional island substrate 112: buffer layer 113: Gate insulation layer 114: Interlayer insulation 115: Planarization layer 116, 616: Embankment 117, 1017: Encapsulation layer 1017a: The first encapsulation layer 1017b: second encapsulation layer 118, AD: Adhesive layer 120: upper substrate 130: Flip chip laminated film 131: Basement membrane 132: drive integrated circuit 140: printed circuit board 150: first transistor 850’, 1550’: second transistor 151: First Gate 851’, 1551’: the second gate 152: The first active layer 852’, 1552’: Second active layer 153: First Source 853’, 1553’: second source 154: The first drain 854’, 1554’: second drain 160: organic light-emitting element 660’: Extra organic light emitting element 161: Anode 661’: Extra anode 162: organic light emitting layer 662’: Extra organic light emitting layer 163: Cathode 663’: Extra cathode 171, 471: Gate pads 172: connection pad 173: Data Pad 180, 480, 680: connection line 181, 481, 681: the first connection line 182, 482, 682: second connection line 683, 883: third connection line 684: Fourth Connection Line 190: Polarizing layer 1360: LED 1460: Extra LED 1361, 1461: N-type layer 1362, 1462: Active layer 1363, 1463: P-type layer 1364, 1464: N pole 1365, 1465: P pole 1381: The first connection pad 1383: second connection pad 1481: third connection pad 1483: Fourth connection pad AA: active area NA: Inactive area A1: The first area A2: The second area A3: The third area PX: pixel APX: Extra pixels SPX, SPX1, SPX1, SPX3: sub-pixel ASPX1, ASPX2, ASPX3: additional sub-pixels CL: Shared line

The above and other aspects, features and other advantages of the present invention will be understood more clearly through the following detailed description and with reference to the accompanying drawings, among which: FIG. 1 is an exploded schematic diagram of a stretchable display device according to an embodiment of the invention. FIG. 2 is an enlarged plan view of a stretchable display device according to an embodiment of the invention. FIG. 3 is a schematic cross-sectional view of a sub-pixel in FIG. 1. 4 is an enlarged plan view of a stretchable display device according to another embodiment of the invention. FIG. 5 is a schematic cross-sectional view of a sub-pixel of the stretchable display device of FIG. 4. FIG. 6 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. FIG. 7A is a schematic cross-sectional view of the stretchable display device of FIG. 6. FIG. 7B is a schematic cross-sectional view when the stretchable display device of FIG. 7A is stretched. FIG. 8 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of the stretchable display device of FIG. 8. FIG. 10 is an enlarged plan view of a stretchable display device according to another embodiment of the present invention. FIG. 11 is a schematic cross-sectional view of the stretchable display device of FIG. 10. 12 is a schematic cross-sectional view of a stretchable display device according to another embodiment of the invention. 13A is a schematic cross-sectional view of a sub-pixel of a stretchable display device according to another embodiment of the invention. FIG. 13B is a schematic cross-sectional view of the stretchable display device of FIG. 13A when it is stretched. 14A is a schematic cross-sectional view of a sub-pixel of a stretchable display device according to another embodiment of the invention. FIG. 14B is a schematic cross-sectional view when the stretchable display device of FIG. 14B is stretched. 15 is a schematic cross-sectional view of a sub-pixel of a stretchable display device according to another embodiment of the invention.

600: Stretchable display device

610: Lower substrate

111: Island substrate

117: Encapsulation layer

163: Cathode

663’: Extra cathode

680: connection line

681: first connection line

682: second connection line

683: third connection line

684: Fourth Connection Line

A1: The first area

A2: The second area

A3: The third area

PX: pixel

APX: Extra pixels

SPX, SPX1, SPX1, SPX3: sub-pixel

ASPX1, ASPX2, ASPX3: additional sub-pixels

Claims (28)

A stretchable display device includes: a lower substrate made of a stretchable insulating material, and the lower substrate has an active area and a non-active area, the non-active area surrounds the active area; a plurality of islands The substrates are separated from each other and arranged in the active area of the lower substrate; a plurality of pixels are respectively arranged on the island substrates; and a plurality of connection lines are arranged on the island substrates on the lower substrate And are electrically connected to corresponding pad portions, and the corresponding pad portions are respectively disposed in the island substrates; wherein the elastic modulus of the island substrates is higher than that of the lower substrate The active area of the lower substrate is divided into a plurality of first regions, a plurality of second regions and a plurality of third regions, the island substrates are disposed in the first regions, and the connection lines are disposed in the The second regions, and the third regions are surrounded by the first regions and the second regions; wherein the stretchable display device further includes a plurality of additional pixels, and the additional pixels are respectively formed on the lower substrate Of these third areas. The stretchable display device described in item 1 of the scope of patent application further includes: a buffer layer disposed on the island substrates; a gate insulating layer disposed on the buffer layer; an interlayer insulating layer, Arranged on the gate insulating layer; and a planarization layer arranged on the interlayer insulating layer; Wherein, the buffer layer, the gate insulating layer, the interlayer insulating layer and the planarization layer are formed by patterning so as to correspond to the island substrates, respectively. According to the stretchable display device described in claim 1, wherein each of the connecting lines includes a base polymer and a plurality of conductive particles, the base polymer is made of a stretchable insulating material, and The conductive particles are arranged in the base polymer. The stretchable display device described in item 3 of the scope of patent application, wherein the base polymer and the conductive particles are formed into a linear shape. The stretchable display device described in item 3 of the scope of the patent application, wherein the base polymer is formed as a single layer to cover the area of the lower substrate that does not overlap with the island substrates, and the conductive particles are in the The base polymer is formed in a linear shape. In the stretchable display device described in item 3 of the scope of patent application, the top surface of each of the connecting lines is flat. In the stretchable display device described in the first item of the patent application, each of the connecting lines is made of conductive elements, and each of the connecting lines is formed in a curved shape on the lower substrate. As for the stretchable display device described in claim 7, wherein the connection lines include a plurality of first connection lines and a plurality of second connection lines, and the first connection lines extend along a first direction, The second connecting lines extend along a second direction different from the first direction, and the gates of the driving transistors included in the pixels are made of the same material as the first connecting lines. The plurality of source electrodes or the plurality of drain electrodes of the driving transistors and the second connecting lines are made of the same material. The stretchable display device described in item 7 of the scope of patent application, wherein A conductive reinforcing member is arranged above or below a predetermined area of the connecting lines. According to the stretchable display device described in claim 9, wherein the conductive reinforcing member is made of a conductive polymer or a liquid metal, and the conductive polymer includes a base polymer and a plurality of conductive particles. According to the stretchable display device described in item 9 of the scope of patent application, the conductive reinforcing member is disposed in a peak area of the connecting lines. In the stretchable display device described in claim 11, the peak area is an area where tensile stress is concentrated. According to the stretchable display device described in claim 1, wherein the top surfaces of the third regions of the lower substrate have a non-uniform shape, and the plurality of first regions of the lower substrate The top mask has a flat shape. The stretchable display device described in claim 1 further includes a plurality of additional light-emitting elements, and the additional light-emitting elements are arranged in the additional pixels. The stretchable display device described in claim 14, wherein the top surfaces of the third regions of the lower substrate have a non-uniform shape, and each of the additional light-emitting elements includes an anode and an organic The light-emitting layer and a cathode, and the anode, the organic light-emitting layer and the cathode each have a shape corresponding to the non-uniform shape. In the stretchable display device described in claim 14, wherein the additional light-emitting elements are light-emitting diodes. According to the stretchable display device described in claim 1, wherein the plurality of driving transistors included in the pixels formed in the first regions are commonly used for the plurality of driving transistors formed in the third regions. Extra pixels. According to the stretchable display device described in claim 1, wherein the additional pixels include a plurality of additional driving transistors, and the additional driving transistors are respectively disposed on the island substrates and drive the additional Pixels. The stretchable display device described in claim 1 further includes an encapsulation layer covering the pixels on the island substrates and the additional pixels formed on the third regions . In the stretchable display device described in claim 19, the encapsulation layer does not cover the second regions of the lower substrate. According to the stretchable display device described in claim 1, wherein the top surfaces of the second regions of the lower substrate have a non-uniform shape. In the stretchable display device described in item 21 of the scope of patent application, the connecting lines have a shape corresponding to the non-uniform shape. The stretchable display device described in item 1 of the scope of the patent application further includes an upper substrate and a polarizing layer. The upper substrate is made of a stretchable insulating material. The upper substrate overlaps the lower substrate. The polarizing layer is disposed on the upper substrate and used to suppress external light reflection. As described in the first item of the scope of patent application, the stretchable display device further includes a plurality of light-emitting elements and a plurality of additional light-emitting elements. The light-emitting elements are arranged in a plurality of sub-pixels, and the additional light-emitting elements are arranged in a plurality of additional light-emitting elements. In the sub-pixel, the same voltage is applied to an anode of a first light-emitting element of the light-emitting elements and an anode of a first additional light-emitting element of the additional light-emitting elements. The stretchable display device described in item 24 of the scope of patent application, wherein the The anode of the first light-emitting element is integral with the anode of the first additional light-emitting element. As described in item 24 of the scope of patent application, the stretchable display device further includes a transistor disposed on one of the island substrates on which the first light-emitting element is disposed, and The same voltage is applied to the anode of the first light-emitting element and the anode of the first additional light-emitting element. The stretchable display device described in claim 1 further includes a plurality of light-emitting elements and a plurality of additional light-emitting elements. The light-emitting elements are arranged on a plurality of sub-pixels, and the additional light-emitting elements are arranged on a plurality of additional light-emitting elements. On the sub-pixels, the light-emitting elements and the additional light-emitting elements are used to be driven independently of each other. The stretchable display device described in claim 27, further comprising a first transistor and a second transistor, and the first transistor is connected to an anode of a first light-emitting element of the light-emitting elements , The first transistor is disposed on one of the island substrates on which the first light-emitting element is disposed, and the second transistor is connected to one of the first additional light-emitting elements of the additional light-emitting elements The anode, the second transistor and the first transistor are arranged on the same one of the island substrates.

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