Stretchable display device

Abstract

A stretchable display device according to an embodiment of the present invention comprises: a transistor substrate including first regions and a second region on a base substrate, the first regions in

Description

STRETCHABLE DISPLAY DEVICE [Technical Field]

[0001] The present disclosure relates to a stretchable display apparatus. [Background Art]

[0002] As information technology advances, the market for display apparatuses which are connection mediums connecting a user to information is growing. Therefore, the use of display apparatuses such as organic light emitting display (OLED) apparatuses, liquid crystal display (LCD) apparatuses, and plasma display panel (PDP) is increasing.

[0003] Recently, as technology associated with display apparatuses advances, flexible display apparatuses capable of being folded or changed to a roll shape are being researched and developed. The flexible display apparatuses may be implemented as various types such as bendable display apparatuses, foldable display apparatuses, and rollable display apparatuses. Furthermore, research and development are being actively done on the stretchable display apparatuses capable of being stretched in a widthwise or lengthwise direction.

[0004] Such stretchable display apparatuses may be applied to televisions (TVs), vehicle displays, and wearable devices as well as mobile devices such as smartphones and tablet personal computers (PCs), and the application field thereof is expanding. [DETAILED DESCRIPTION OF THE INVENTION] [Technical Problem]

[0005] The present disclosure may provide a stretchable display apparatus in which a reduction pattern is disposed on a connection line electrically connecting pixel substrates to decrease a stress occurring in a bent region of the connection line, thereby enhancing the reliability of a display panel. [Technical Solution]

[0006] To achieve these objects and other advantages and in accordance with the purpose of the disclosure, as embodied and broadly described herein, a stretchable display apparatus includes a transistor substrate including a first region, where a plurality of pixel substrates are disposed on a base substrate, and a second region where a surface of the base substrate is exposed between a plurality of first regions, a connection line connecting each of the plurality of pixel substrates to an adjacent pixel substrate and extending on the plurality of pixel substrates, and accordingly, disposed in the second region, and a reduction pattern disposed apart from the connection line in the second region. Here, the reduction pattern may include a first reduction pattern disposed in the second region to overlap the connection line disposed in the second region and a second reduction pattern disposed apart from the first reduction pattern by a first interval to have a shape corresponding to a partial region along a shape of the connection line.

[0007] Moreover, each of the connection line and the first reduction pattern may include a first shape region disposed in a wavy shape and a second shape region disposed in a rectilinear shape, the first shape region and the second shape region being provided as one body, and the second reduction pattern may be disposed in a shape corresponding to an outer circumference surface of the first shape region.

[0008] Moreover, a third reduction pattem disposed to correspond to an inner circumference surface of the first shape region may be further provided.

[0009] Here, the third reduction pattern may be disposed in one shape selected from among an oval pattern, a semicircular pattern, a line pattern, and a combination shape thereof, which have an island shape along the inner circumference surface of the first shape region.

[00010] The first to third reduction patterns may include the same material.

[00011] The second reduction pattern may further include a connection pattern connecting the second reduction pattern to the third reduction pattern.

[00012] Here, one side of an end portion of the third reduction pattern may be disposed adjacent to the inner circumference surface of the first shape region, and the other side of the end of the third reduction pattern may be disposed adjacent to a boundary portion between the first shape region and the second shape region, an end portion of the other side of the third reduction pattern may be connected to the connection pattern, and end portions of one side and the other side of the connection pattern may connect end portions of a plurality of second reduction patterns.

[00013] The first reduction pattern may be disposed to contact a side surface of a corresponding pixel substrate of the plurality of pixel substrates.

[00014] Moreover, the first reduction pattern may be disposed to have a thickness which is less than or equal to a thickness of each of the plurality of pixel substrates.

[00015] The reduction pattern may include one material selected from among polyimide (Pl)-based resin, epoxy-based resin, and a compound thereof each having the same flexibility as flexibility of the base substrate.

[00016] The first interval may be within a range of about 0.01 umn to about 4 um.

[00017] Moreover, the third reduction pattern and the connection line may be disposed apart from each other by a second interval, and the second interval is within a range of about 0.01 um to about 4 um.

[00018] The connection line may be provided in plurality, and the first reduction pattern may be disposed to correspond to each of the plurality of connection lines.

[00019] The transistor substrate according to an embodiment of the present disclosure may include a pixel substrate disposed in only a first region of the base substrate to have rigidity which is greater than rigidity of the base substrate, a buffer layer disposed on each of the plurality of pixel substrates, a transistor including a gate electrode disposed on the buffer layer, a gate line provided as one body with the gate electrode, a gate insulation layer disposed on the gate electrode, an active layer disposed on the gate insulation layer, an interlayer insulation layer disposed on the active layer, a source / drain electrode disposed on the interlayer insulation layer, a data line provided as one body with the source / drain electrode, and a planarization layer disposed on the source / drain electrode and the data line, a data line pad and a gate line pad disposed on the planarization layer and respectively connected to the data line and the gate line, and an organic light emitting device connected to the transistor, and the connection line may include a first connection line connected to the gate line pad to travel in a widthwise direction of the plurality of pixel substrates and a second connection line connected to the data line pad to travel in a lengthwise direction of the plurality of pixel substrates.

[00020] The buffer layer may include one material selected from among silicon rubber including polydimethylsiloxane (PDMS), elastomer including polyurethane (PU), and a compound thereof.

[00021] The organic light emitting device according to an embodiment of the present disclosure may include an anode connected to the transistor and disposed on the planarization layer, a bank including an opening portion exposing a portion of the anode and a contact hole exposing a portion of each of the data line pad and the gate line pad, an organic light emitting layer disposed on the anode exposed by the bank, and a cathode disposed on the organic light emitting layer, and the first connection line and the second connection line, respectively connected to the gate line pad and the data line pad each exposed through the contact hole, may be disposed on the bank.

[00022] Here, the gate line pad, the data line pad, and the anode may include the same material.

[00023] Moreover, the first connection line and the second connection line may be disposed to contact a top surface and a side surface of the bank 270 disposed on the plurality of pixel substrates, the planarization layer, the interlayer insulation layer, the gate insulation layer, the buffer layer, and side surfaces of the plurality of pixel substrates and to extend to a top surface of the first reduction pattern.

[00024] Specific details of other embodiments are included in the detailed description and drawings. [ADVANTAGES OF THE INVENTION]

[00025] Inthe stretchable display apparatus according to the embodiments of the present disclosure, a reduction pattern may be disposed adjacent to a connection line electrically connecting pixel substrates, thereby decreasing a stress occurring in a bent region of the connection line.

[00026] Moreover, in the stretchable display apparatus according to the embodiments of the present disclosure, by using the reduction pattern disposed adjacent to the connection line, an elongation characteristic may be secured and a crack of the connection line may be prevented, thereby enhancing the reliability of a display panel.

[00027] The effects according to the present disclosure are not limited to the above examples, and other various effects may be included in the specification. [Description of Drawings]

[00028] FIG. 1 is a perspective view of a stretchable display apparatus according to an embodiment of the present disclosure;

[00029] FIG. 2 is an exploded perspective view of a stretchable display apparatus according to an embodiment of the present disclosure:

[00030] FIG. 3 is an enlarged plan view illustrating the enlargement of a region A of FIG. 2:

[00031] FIG. 4 is an enlarged plan view illustrating the enlargement of a region B of FIG. 3:

[00032] FIG. 5is a cross-sectional view taken along line |-I' of FIG. 4;

[00033] FIG. 6 is a cross-sectional view schematically illustrating an example of a subpixel structure of a stretchable display apparatus according to another embodiment of the present disclosure;

[00034] FIG. 7 is a plan view illustrating a shape of a third reduction pattern of a stretchable display apparatus according to another embodiment of the present disclosure;

[00035] FIG. 8 is a plan view illustrating a shape of a third reduction pattern of a stretchable display apparatus according to another embodiment of the present disclosure; and

[00036] FIG. 9 is a plan view illustrating a shape of a third reduction pattern of a stretchable display apparatus according to another embodiment of the present disclosure. [SPECIFIC CONTENTS FOR PRACTICING THE INVENTION]

[00037] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the specification, in adding reference numerals for elements in each drawing, it should be noted that like reference numerals already used to denote like elements in other drawings are used for elements wherever possible. In the following description, when the detailed description of the relevant known function or configuration is determined to unnecessarily obscure the important point of the present disclosure, the detailed description will be omitted. In describing embodiments, the same elements are representatively described at a beginning part.

[00038] It will be understood that, although the terms including ordinal numbers such as “first” and “second” may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[00039] A flexible display apparatus according to the present disclosure may be a display apparatus where a display device is provided on a flexible substrate. Examples of the flexible display apparatus may use an organic light emitting display apparatus, a liquid crystal display (LCD) apparatus, and an electrophoresis display apparatus, but in the present disclosure, an organic light emitting display apparatus will be described for example. The organic light emitting display apparatus may include an organic light emitting layer which is disposed between a first electrode (an anode) and a second electrode (a cathode) and includes an organic material. Accordingly, the organic light emitting display apparatus may be a self-emitting display apparatus where a hole supplied from the first electrode and an electron supplied from the second electrode are combined in the organic light emitting layer to generate an exciton which is a hole-electron pair, and light is emitted with energy generated based on the shift of the exciton to a ground state.

[00040] The flexible display apparatus according to the present disclosure may be a stretchable display apparatus. The stretchable display apparatus may be referred to as a display apparatus for displaying an image despite being bent or stretched. The stretchable display apparatus may have flexibility which is higher than general display apparatuses. Therefore, a user may allow the stretchable display apparatus to be bent or stretched, and thus, a shape of the stretchable display apparatus may be freely changed based on the manipulation of the user. For example, when the user pulls an end of the stretchable display apparatus with a hand of the user, the stretchable display apparatus may be stretched by a force of the user. Alternatively, when the user places the stretchable display apparatus on a non-flat wall, the stretchable display apparatus may be disposed to be bent along a shape of a surface of the wall. Also, when the force applied by the user is released, the stretchable display apparatus may return to an original shape again.

[00041] FIG. 1 is a perspective view of a stretchable display apparatus 1000 according to an embodiment of the present disclosure, and FIG. 2 is an exploded perspective view of the stretchable display apparatus 1000 according to an embodiment of the present disclosure.

[00042] Asiillustrated in FIGS. 1 and 2, the stretchable display apparatus 1000 according to an embodiment of the present disclosure may include a display panel 100, a connection member 800, and a flexible printed circuit board (FPCB) 300.

[00043] The display panel 100 may be elastic in one of a first direction X and a second direction Y. The display panel 100 may be two-dimensionally elastic in the first direction X and the second direction Y. Here, the first direction X and the second direction Y may configure a plane of the stretchable display apparatus 1000, and the second direction Y may be a direction vertical to the first direction X.

[00044] The display panel 100 may include a transistor substrate 110 and an encapsulation film 400. Also, although not shown in FIG. 1, the display panel 100 may further include a polarizer which may be disposed under the transistor substrate 110 or on the encapsulation film 400.

[00045] The encapsulation film 400 may be disposed to overlap the transistor substrate 110 and may be a substrate for protecting some elements of the display panel 100. The encapsulation film 400 may be a flexible substrate and may include a material which is bendable or flexible. For example, the encapsulation film 400 may include a material having elasticity, but is not limited thereto.

[00046] The display panel 100 may include a display area A / A displaying an image and a non-display area N / A which is disposed to surround the display area A / A in a region adjacent to the display area A / A.

[00047] The display area A / A may include a plurality of pixels each including a plurality of subpixels. Each of the plurality of subpixels may include a light emitting device and may be connected to various lines such as a gate line, a data line, a high level power line, a low level power line, and a reference voltage line.

[00048] The non-display area N / A may be an area which is adjacent to the display area A / A and surrounds the display area A / A and may be an area which does not display an image. A circuit unit and a line, which is disposed to extend from a line disposed in the display area A / A, may be disposed in the non-display area N / A. For example, a plurality of bonding pads or signal pads may be disposed in the non-display area N / A, and each of the pads may be connected to each of the plurality of subpixels of the display area A / A.

[00049] The connection member 800 connected to other elements in the non-display area N / A and disposed outside the non-display area N / A may transfer a signal, input from the FPCB 300, to the display panel 100. That is, the connection member 800 may be a connection film which is disposed between the display panel 100 and the FPCB 300 and electrically connects the display panel 100 to the FPCB 300.

[00050] The connection member 800 may be bonded to the plurality of bonding pads disposed in the non-display area N / A and may supply a source voltage, a data voltage, and a gate voltage to each of the plurality of subpixels of the display area A / A through the bonding pad.

[00051] The connection member 800 may include a base film 810, a driving circuit chip 820 disposed on the base film 810, and a plurality of conductive lines (not shown) which are disposed on the base film 810 and transfer a driving signal or a control signal.

[00052] The base film 810 may be a layer which supports the driving circuit chip 820. The base film 810 may include an insulating material having flexibility, and for example, may include polyimide (Pl)-based resin or epoxy-based resin.

[00053] The driving circuit chip 820 may process data for processing an image input from the outside and a driving signal for processing the data. In FIGS. 1 and 2, the driving circuit chip 820 is illustrated as being mounted as a chip-on film (COF) type, but is not limited thereto and may be mounted as a type such as a chip-on glass (COG) type or a tape carrier package (TCP) type.

[00054] Although not shown, the connection member 800 may further include a plurality of conductive lines which are disposed on at least one surface of the base film 810. The plurality of conductive lines may transfer image data and driving data, input from the FPCB 300, to the driving circuit chip 820 and may transfer a data signal and a driving control signal, output from the driving circuit chip 820, to the display panel 100. The conductive lines may each have a wavy shape or a diamond shape, so as to minimize damage in elongating.

[00055] The stretchable display apparatus 1000 according to an embodiment of the present disclosure may divide the base film 810 of the connection member 800 to correspond to each of the plurality of conductive lines disposed on the base film 810 in a one-to-one relationship, and thus, when the display panel 100 elongates, the connection member 800 may be deformed to correspond thereto, thereby minimizing a stress of the connection member 800 caused by the elongation of the display panel 100.

[00056] The transistor substrate 110 may be a substrate which supports some elements disposed in the display panel 100. The transistor substrate 110 may include a base substrate 111, which includes a flexible material and is bendable or extendable, and a pixel substrate 115 of the transistor substrate 110 which is disposed on the base substrate 111 and includes a rigid material which is more ridged than that of the transistor substrate 110.

[00057] Here, the pixel substrate 115 of the transistor substrate 110 may not be disposed on a front surface of the base substrate 111 of the transistor substrate 110 and may be selectively disposed in an island shape in a predetermined region, and adjacent pixel substrates 115 may be disposed apart from each other.

[00058] Moreover, a first region F1 and a second region F2 having different modulus may be defined in the display area A / A and the non-display area N / A.

[00059] Here, in the display area A / A, the first region F1 may be a region where each of a plurality of pixels is disposed, and the second region F2 may be a region where a plurality of connection lines 500 electrically connecting the pixels are disposed. In detail, the first region F1 may be a region where the pixel substrate 15 is disposed, and the second region F2 may be a region where a surface of the base substrate 111 is exposed because the pixel substrate 115 is not disposed.

[00060] Moreover, in the non-display area N / A, the first region F1 may be a region where the bonding pad electrically connected to the connection member 800 or the signal pad or the circuit unit applying a driving signal to each of the plurality of pixels is disposed, and the second region F2 may be a region where a connection line 500 disposed in the display area A / A is disposed to extend.

[00061] The connection line 500 may have a wavy shape or a diamond shape, so as to minimize damage in elongating.

[00062] In the stretchable display apparatus 1000 according to an embodiment of the present disclosure, in a case where a plurality of connection lines 500 are disposed in the second region F2 of the base substrate 111 to connect the pixel substrates 115, the connection line 500 may be deformed to correspond thereto, thereby minimizing a stress of the connection line 500 caused by the elongation of the display panel 100.

[00063] Hereinafter, the stretchable display apparatus 1000 according to an embodiment of the present disclosure will be described in more detail. Particularly, a structure of the stretchable display panel 100 among the elements of the stretchable display apparatus 1000 will be described in more detail

[00064] FIG. 3 is an enlarged plan view illustrating the enlargement of a region A of FIG. 2, FIG. 4 is an enlarged plan view illustrating the enlargement of a region B of FIG. 3, and FIG. 5 is a cross-sectional view taken along line I-I' of FIG. 4.

[00065] As illustrated in FIGS. 3 to 5, a transistor 110 of a stretchable display apparatus 1000 according to an embodiment of the present disclosure may include a base substrate 111, a plurality of pixel substrates 115, a connection line 500, and a reduction pattern 700.

[00066] The base substrate 111 may be a substrate which supports and protects some elements of the stretchable display apparatus 1000. The base substrate 111 may be a flexible substrate and may include an insulating material which is bendable or flexible. For example, the base substrate 111 may include silicon rubber, such as polydimethylsiloxane (PDMS), or elastomer such as polyurethane (PU). However, a material of the base substrate 111 is not limited thereto.

[00067] The base substrate 111 may be modulus of several MPa to hundreds MPa, and an elongation failure rate thereof may be 100% or more. A thickness of the base substrate 111 may be about 10 xm to about 1 mm, but is not limited thereto.

[00068] A plurality of pixel substrates 115 may be disposed on the base substrate 111. The plurality of pixel substrates 115 may each be a rigid substrate having rigidity compared to the base substrate 111 and may be disposed apart from one another in a first region F1 of the base substrate 111. In more detail, the plurality of pixel substrates 115 may be less in elasticity than the base substrate 111 and may have a rigid characteristic.

[00069] Modulus of the plurality of pixel substrates 115 may be 1,000 or more higher than modulus of the base substrate 111. The plurality of pixel substrates 115 may include a plastic material having flexibility, and for example, may include Pl-based resin or epoxy- based resin.

[00070] As described above, the base substrate 111 and the plurality of pixel substrates 115 may have different rigidities, and thus, the transistor substrates 110 may have different modulus. Therefore, the transistor substrate 115 of the stretchable display apparatus according to an embodiment of the present disclosure may include the first region F1 and a second region F2, which have different modulus.

[00071] In more detail, the first region F1 may be a region where the pixel substrate 115 is disposed, and the second region F2 may be a region where the pixel substrate 115 is not disposed. The first region F1 may have modulus which is higher than that of the second region F2. Here, modulus may be an elastic coefficient representing a rate which is deformed by a stress with respect to a stress applied to a substrate, and when modulus is relatively high, rigidity may be relatively high.

[00072] Therefore, the first region F1 may be a rigid region having rigidity which is higher than that of the second region F2. Therefore, a pixel PX including a plurality of subpixels SPX for displaying an image may be disposed in the first region F1 (i.e., each of the plurality of pixel substrates 115). A detailed description of a structure of each subpixel SPX will be described below with reference to FIG. 8.

[00073] The connection line 500 may be disposed between the plurality of pixel substrates 115 (i.e., in the second region F2). The connection line 500 may be disposed between pads or lines disposed on the plurality of pixel substrates 115 and may electrically connect the pads or the lines.

[00074] The connection line 500 may include a first connection line 510 and a second connection line 520. The first connection line 510 may be a line which is disposed in an x- axis direction in the display panel 100, and the second connection line 520 may be a line which is disposed in a y-axis direction in the display panel 100.

[00075] In FIG. 3, the connection line 500 is illustrated as having a wavy shape, but is not limited thereto and may be disposed in a diamond shape so as to prevent the damage of the connection line 500 when the display panel 100 is elongating.

[00076] In general organic light emitting display apparatuses, various lines such as a plurality of gate lines and a plurality of data lines may be disposed to extend between a plurality of subpixels, and a plurality of subpixels may be connected to one signal line. Therefore, in the general organic light emitting display apparatuses, various lines such as a gate line, a data line, a high level power line, a low level power line, and a reference voltage line may extend from one side of an organic light emitting display apparatus to the other side thereof without disconnection, on a substrate.

[00077] In the stretchable display apparatus 1000 according to an embodiment of the present disclosure, various lines such as a gate line, a data line, a high level power line, a low level power line, and a reference voltage line each including a metal material may be disposed on only the plurality of pixel substrates 115.

[00078] That is, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, various lines including a metal material may be disposed on only the plurality of pixel substrates 115 and may not be provided to contact the base substrate 111. Therefore, the various lines may be patterned to correspond to the plurality of pixel substrates 115 and may be discontinuously disposed.

[00079] In the stretchable display apparatus 1000 according to an embodiment of the present disclosure, pads or lines on two pixel substrates 115 adjacent to each other may be connected to each other by the connection line 500, so as to connect discontinuous lines.

[00080] That is, the connection line 500 may electrically connect two adjacent pixel substrates 115 having an island shape. For example, a gate line may be disposed in each of a plurality of pixel substrates 115 disposed adjacent to one another in the x-axis direction, and a gate line pad may be disposed on each of the pixel substrates 115 at both ends of the gate line.

[00081] Here, a plurality of gate line pads may be electrically connected to one another by the connection line 500 disposed between one pixel substrate 115 and another pixel substrate 115 adjacent to the one pixel substrate 115. Also, the connection line extending in the x-axis direction may function as a gate line for transferring a gate signal.

[00082] That is, as illustrated in FIG. 3, the first connection line 510 may function as a gate line, but is not limited thereto and may also function as a low level power line. In other words, the connection line 500 may be provided in plurality and may function as a low level power line and a gate line.

[00083] The second connection line 520 may connect pads or lines on two pixel substrates 115 disposed adjacent to each other among a plurality of pads or lines on a plurality of pixel substrates 115 disposed adjacent to one another in the y-axis direction. The second connection line 520 may be provided in plurality and may function as a data line, a high level power line, and a gate line, but is not limited thereto.

[00084] Atleast one of the first connection line 510 and the second connection line 520 of the connection line 500 may include one material, selected from among the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[00085] The stretchable display apparatus 1000 according to an embodiment of the present disclosure may include the reduction pattern 700 disposed in the second region F2 of the transistor substrate 110.

[00086] The reduction pattern 700 may be disposed in the second region F2 of the base substrate 111 and may include a first reduction pattern 710 disposed to overlap the connection line 500 and a second reduction pattern 720 which is apart from the first reduction pattern 710 by a first interval D1 and is disposed in a shape corresponding to a partial region along a shape of the connection line 500.

[00087] In detail, referring to FIGS. 4 and 5, the first reduction pattern 710 may be disposed between the base substrate 111 and the connection line 500. In other words, the first reduction pattern 710 may be disposed in the same shape as that of the connection line 500 in the second region F2, but is not limited thereto and may be disposed to have a wider area than a width of the connection line 500 depending on the case.

[00088] The first reduction pattern 710 and the connection line 500 may include a first shape region Q1 disposed in a wavy shape and a second shape region Q2 disposed in a rectilinear shape. The first shape region Q1 and the second shape region Q2 may be formed as one body.

[00089] Moreover, the first shape region Q1 disposed in a wavy shape may include an outer circumference surface OCP and an inner circumference surface ICP, which are formed in a bent region. A compressed tensile force may be generated in the outer circumference surface OCP of the first shape region Q1, and thus, a stress may be in the outer circumference surface OCP of the connection line 500. The stress may cause a crack to occur along the outer circumference surface OCP of the connection line 500. The crack may increase the breakdown or resistance of the connection line 500, causing a reduction in total reliability of the display panel 100.

[00090] Therefore, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the second reduction pattern 720 for reducing a stress occurring along the outer circumference surface OCP of the connection line 500 may be disposed in a shape corresponding to the outer circumference surface OCP of the first shape region Q1. In other words, because the second reduction pattern 720 is disposed in a shape corresponding to the outer circumference surface OCP of the first shape region Q1, the second reduction pattern 720 may be formed in a wavy shape.

[00091] In the first shape region Q1 of the connection pattern 500, the second reduction pattern 720 may be disposed apart from the connection pattern 500 by the first interval D1. The first interval D1 may be within a range of about 0.01 um to about 4 «mn. The first interval D1 may be a space for absorbing a stress occurring in the outer circumference surface OCP of the connection line 500. When the first interval D1 is less than about 0.01 um, the connection line 500 may be disposed adjacent to the first reduction pattern 710, and thus, an efficiency of transferring a stress of the connection line 500 to the second reduction pattern 720 may be reduced. When the first interval D1 is more than about 4 xn, a separation distance between the second reduction pattern 720 and the connection line 500 may increase, and thus, the second reduction pattern 720 may not easily absorb a stress of the connection line 500.

[00092] Moreover, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the third reduction pattern 730 for reducing a stress occurring along the inner circumference surface ICP of the connection line 500 may be disposed on the inner circumference surface ICP of the first shape region Q1.

[00093] The third reduction pattern 730 may be formed as an island-shaped pattern along the inner circumference surface ICP of the first shape region Q1. As another example, the third reduction pattern 730 may be disposed in one shape selected from among an oval pattern, a semicircular pattern, a line pattern, and a combination shape thereof. As another example, the third reduction pattern 730 may be disposed to be connected to the second reduction pattern 720.

[00084] In the inner circumference surface ICP of the first shape region Q1 of the connection pattern 500, the third reduction pattern 730 may be disposed apart from the connection pattern 500 by a second interval D2. The second interval D2 may be within a range of about 0.01 un to about 4 um. The second interval D2 may be a space for absorbing a stress occurring in the inner circumference surface ICP of the connection line 500. When the second interval D2 is less than about 0.01 ¢m, the connection line 500 may be disposed adjacent to the first reduction pattern 710, and thus, an efficiency of transferring a stress of the connection line 500 to the third reduction pattern 730 may be reduced. When the second interval D2 is more than about 4 um, a separation distance between the third reduction pattern 730 and the connection line 500 may increase, and thus, the third reduction pattern 730 may not easily absorb a stress of the connection line 500.

[00095] The reduction pattern 700 including the first to third reduction patterns 710 to 730 may include one material selected from among Pl-based resin, epoxy-based resin, and a compound thereof each having a flexible characteristic which is the same as or similar to that of the base substrate 111.

[00096] The reduction pattern 700 including the first to third reduction patterns 710 to 730 may include the same material, and thus, even without an additional process, cracks occurring in the outer circumference surface OCP and the inner circumference surface ICP of the first shape region Q1, which is wavy, of the connection pattern 500 may be minimized. [000971 Therefore, the reduction pattern 700 of the stretchable display apparatus 1000 according to an embodiment of the present disclosure may minimize a crack occurring in the connection line 500 when the base substrate 111 is bent, stretched, or contracted, thereby enhancing the reliability of the display panel 100.

[00098] In the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the base substrate 111 having a flexible characteristic may be disposed under the plurality of pixel substrates 115.

[00099] Therefore, a region, other than a region overlapping the plurality of pixel substrates 115, of the base substrate 111 may be easily stretched or bent, and thus, the stretchable display apparatus 1000 may be implemented. [000100] Moreover, transistors and organic light emitting devices disposed on the plurality of pixel substrates 115 which are rigid substrates may be prevented from being damaged when the stretchable display apparatus 1000 is bent or stretched. [000101] Hereinafter, a subpixel structure SPX of the stretchable display apparatus 1000 according to the present disclosure will be described in more detail. [000102] FIG. 6 is a cross-sectional view schematically illustrating an example of a subpixel structure of a stretchable display apparatus 1000 according to an embodiment of the present disclosure. [000103] Referring to FIG. 6, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, a plurality of pixel substrates 115 may be disposed in a first region F1 of a base substrate 111, and a buffer layer 213 may be disposed on the pixel substrate 115. [000104] The buffer layer 213 may be disposed on the plurality of pixel substrates 115 so as to protect various elements of the stretchable display apparatus 1000 from the penetration of oxygen and water from the outside. [000105] The buffer layer 213 may include an insulating material, and for example, may be formed of a single layer or a multilayer including an organic layer including silicon nitride (SiNx), silicon oxide (SiOx), or silicon oxynitride (SiON). [000106] Here, the buffer layer 213 may be formed in only a region overlapping the plurality of pixel substrates 115. As described above, the buffer layer 213 may include an organic material, and due to this, a crack may easily occur in a process of elongating the stretchable display apparatus 1000, causing damage. Accordingly, the buffer layer 213 may not be formed in a region between the plurality of pixel substrates 115, and may be patterned similar to a shape of the plurality of pixel substrates 115 and thus may be formed on only the plurality of pixel substrates 115. [000107] Therefore, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the buffer layer 213 may be formed in only a region overlapping the plurality of pixel substrates 115 which are rigid substrates, and thus, even when deformation such as the bending or stretching of the stretchable display apparatus 1000 occurs, the damage of the buffer layer 113 may be prevented. [000108] As another example, the buffer layer 213 disposed in the first region F1 which is ridged may include a material selected from among silicon rubber including polydimethylsiloxane (PDMS), elastomer including polyurethane (PU), and a compound thereof. [000109] When a Young's modulus difference between the second region F2 which is stretchable and the first region F1 which is ridged occurs largely, the pixel substrate 115 may be detached from the base substrate 111. Accordingly, when a material having a flexible characteristic is applied to the buffer layer 213, a stress may widely spread in the first region F1 which is ridged. In other words, when a material having a flexible characteristic is applied to the buffer layer 213, a stress may be slight in the first region F1 which is ridged, thereby protecting a transistor (TFT, 240) characteristic. [000110] The transistor 240 including a gate electrode 241, an active layer 242, a source electrode 243, and a drain electrode 244 may be formed on the buffer layer 213. To describe a process of forming the transistor 240, for example, the active layer 242 may be formed on the buffer layer 213, and a gate insulation layer 214 for insulating the active layer 242 from the gate electrode 241 may be formed on the active layer 242. An interlayer insulation layer 215 for insulating the gate electrode 241, the source electrode 243, and the drain electrode 244 may be formed, and the source electrode 243 and the drain electrode 244 each contacting the active layer 242 may be formed on the interlayer insulation layer 215. [000111] Moreover, the gate insulation layer 214 and the interlayer insulation layer 215 may be patterned and may be formed in only a region overlapping the plurality of pixel substrates 115. The gate insulation layer 214 and the interlayer insulation layer 215 may also include the same inorganic material as that of the buffer layer 213, and thus, a crack may easily occur in a process of elongating the stretchable display apparatus 100, causing damage. [000112] Therefore, the gate insulation layer 214 and the interlayer insulation layer 215 may not be formed in a region (i.e., the second region F2) between the plurality of pixel substrates 115, and moreover, may be patterned similar to a shape of the plurality of pixel substrates 115 and may be formed on only the plurality of pixel substrates 115. [000113] In FIG. 6, for convenience of description, only a driving transistor among various transistors included in the stretchable display apparatus 1000 is illustrated, but a switching transistor, a capacitor, and the like may be included in the stretchable display apparatus 1000. Also, in the specification, the transistor 240 is described as having a coplanar structure, but is not limited thereto and various transistors having a staggered structure may be used. [000114] A gate line 261 may be disposed on the gate insulation layer 214. The gate line 261 may be a line for transferring a gate signal to the plurality of subpixels SPX. The gate line 216 may include the same material as that of the gate electrode 241, but is not limited thereto. In other words, the gate line 261 and the gate electrode 241 may be formed as one body. [000115] A planarization layer 216 may be formed on the transistor 240 and the interlayer insulation layer 215. The planarization layer 216 may planarize an upper portion of the transistor 240. The planarization layer 216 may include a single layer or a plurality of layers and may include an organic material. For example, the planarization layer 216 may include an acrylic organic material, but is not limited thereto. [000116] The planarization layer 216 may include a contact hole for electrically connecting the transistor 240 to an anode 251, a contact hole for electrically connecting a data line pad 263 to the source electrode 243, and a contact hole for electrically connecting the gate line 261 to a gate line pad 262. [000117] A passivation layer may be formed between the transistor 240 and the planarization layer 216. That is, the passivation layer covering the transistor 240 may be formed for protecting the transistor 240 from the penetration of water and oxygen. The passivation layer may include an inorganic material and may include a single layer or a multilayer, but is not limited thereto. [000118] The data line pad 263, the gate line pad 262, and an organic light emitting device 250 may be disposed. [000119] The data line pad 263 may transfer a data signal, supplied through the connection line 500 acting as a data line, to the plurality of subpixels SPX. In detail, the data line pad 263 may be connected to the second connection line 520. [000120] The data line pad 263 may be connected to the source electrode 243 of the transistor 240 through a contact hole formed in the planarization layer 216. In other words, in the first region F1, a data line may be formed as one body with the source electrode 243, and thus, may not be referred to by a separate reference numeral. The data line pad 263 may include the same material as that of the anode 251 of the organic light emitting device 250, but is not limited thereto. [000121] Moreover, the data line pad 263 may be formed on the interlayer insulation layer 215 instead of the planarization layer 216 and may include the same material as that of each of the source electrode 243 and the drain electrode 244 of the transistor 240. [000122] The gate line pad 262 may transfer a gate signal, supplied through the connection line 500 acting as the gate line 261, to the plurality of subpixels SPX. In detail, the gate line pad 262 may be connected to the first connection line 510. [000123] The gate line pad 262 may be connected to the gate line 261 through a contact hole which is formed in the planarization layer 216 and the interlayer insulation layer 215 and may transfer the gate signal to the gate line pad 262. [000124] The gate line pad 262 may include the same material as that of the data line pad 263, but is not limited thereto. [000125] A first reduction pattern 710 may be disposed in the first connection line 510 and the second reduction line 520. In terms of a plane of the second region F2, the first reduction pattern 710 may be formed to have the same width as that of the first connection line 510 and the second connection line 520. [000126] Also, the first reduction pattern 710 may directly contact a side surface of the pixel substrate 115. Here, the first reduction pattern 710 may be formed to have the same thickness as that of the pixel substrate 115, or may be formed to have a thickness which is less than that of the pixel substrate 115. In the drawing, it is illustrated that the first reduction pattern 710 is formed to have a thickness which is less than that of the pixel substrate 115. [000127] Moreover, the connection line 500 disposed to overlap the first reduction pattern 710 may be disposed apart from a second reduction pattern 720 by a first interval D1, or may be disposed apart from a third reduction pattern 730 by a second interval D2. In the drawing, it is illustrated that the second reduction pattern 730 is disposed, but the third reduction pattern 730 may be disposed in a direction of a cross-sectional surface. In a case where the third reduction pattern 730 is disposed adjacent to the first reduction pattern 710, the third reduction pattern 730 may be disposed apart from the first reduction pattern 710 by a separation distance corresponding to the second interval D2. [000128] The organic light emitting device 250 may be an element which is disposed to correspond to each of the plurality of subpixels SPX and emits light having a specific wavelength band. That is, the organic light emitting device 250 may be a blue organic light emitting device emitting blue light, a red organic light emitting device emitting red light, a green organic light emitting device emitting green light, or a white organic light emitting device emitting white light, but is not limited thereto. When the organic light emitting device 250 is a white organic light emitting device, the stretchable display apparatus 1000 may further include a color filter. [000129] The organic light emitting device 250 may include an anode 251, an organic light emitting layer 252, and a cathode 253. In detail, the anode 251 may be disposed on the planarization layer 216. The anode 251 may be an electrode which is configured to supply a hole to the organic light emitting layer 252. The anode 251 may include a transparent conductive material having a high work function. Here, the transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (1IZO), and indium tin zinc oxide (ITZO). [000130] The anode 251 may include the same material as that of each of the gate line pad 261 and the data line pad 263 disposed on the planarization layer 216, but is not limited thereto. [000131] Moreover, in a case where the stretchable display apparatus 1000 is implemented as a top emission type, the anode 251 may further include a reflector. [000132] The anode 251 may be disposed apart from another anode for each subpixel SPX and may be electrically connected to the transistor 240 through a contact hole of the planarization layer 216. For example, in FIG. 6, the anode 251 is illustrated as being electrically connected to the drain electrode 214 of the transistor 240, but may be electrically connected to the source electrode 243. [000133] A bank 270 may be formed on the anode 251, the data line pad 263, the gate line pad 262, and the planarization layer 216. The bank 270 may be an element which divides adjacent subpixels SPX. [000134] The bank 270 may be disposed to cover at least a portion of each of both sides of an adjacent anode 251 and may expose a portion of a top surface of the anode 251. The bank 270 may solve a problem where the subpixel SPX emits undesired light or colors are mixed because light is emitted in a lateral direction of the anode 251 due to the concentration of a current on a corner of the anode 251. The bank 270 may include acrylic resin, benzocyclobutene (BCB)-based resin, or polyimide, but is not limited thereto. [000135] The bank 270 may include a contact hole CH, connecting the data line pad 263 to the second connection line 520 acting as a data line, and a contact hole CH connecting the gate line pad 262 to the first connection line 510 acting as a gate line. Therefore, the data line pad 263 exposed at the contact hole CH may be disposed on the bank 270, and the first connection line 510 and the second connection line 520 may be respectively disposed on the data line pad 263 and the gate line pad 262. [000136] The connection line 500 including the first connection line 510 and the second connection line 520 may be formed to contact a top surface and a side surface of the bank 270 disposed on the pixel substrate 115, the planarization layer 216, the interlayer insulation layer 215, the gate insulation layer 214, the buffer layer 214, and side surfaces of the plurality of pixel substrates 115 and to extend to a top surface of the first reduction pattern 710. [000137] Moreover, the connection line 500 may contact the line pads 262 and 263 (in detail, the data line pad 263 and the gate line pad 262) on the pixel substrate 115 closest thereto among the plurality of pixel substrates 115. [000138] The organic light emitting layer 252 may be disposed on the anode 251. The organic light emitting layer 252 may be configured to emit light. The organic light emitting layer 252 may include a light emitting material, and the light emitting material may include a phosphorescent material or a fluorescent material. However, the present disclosure is not limited thereto. [000139] The organic light emitting layer 252 may include one light emitting layer. Alternatively, the organic light emitting layer 252 may have a stack structure where a plurality of light emitting layers are stacked with a charge generating layer therebetween. Also, the organic light emitting layer 252 may further include at least one organic layer of a hole transporting layer, an electron transporting layer, a hole blocking layer, an electron blocking layer, a hole injecting layer, and an electron injecting layer. [000140] The cathode 253 may be disposed on the organic light emitting layer 252. The cathode 253 may supply an electron to the organic light emitting layer 252. The cathode 253 may include transparent conductive oxide, such as ITO, IZO, ITZO, zinc oxide (ZnO), or tin oxide (TO), or an ytterbium (Yb) alloy. Alternatively, the cathode 153 may include a metal material. [000141] The cathode 253 may be patterned and formed to overlap each of the plurality of pixel substrates 115. Thatis, the cathode 253 may be formed in only a region overlapping the plurality of pixel substrates 115 and may be disposed not to be provided in a region between the plurality of pixel substrates 115. The cathode 253 may include a material such as transparent conductive oxide or a metal material, and thus, in a case where the cathode 253 is formed between the plurality of pixel substrates 115, the cathode 253 may be damaged in a process of contracting and stretching the stretchable display apparatus 1000. [000142] Therefore, in terms of a plane, the cathode 253 may be formed to correspond to each of the plurality of pixel substrates 115. The cathode 253 may be formed to have an area which does not overlap a region, where the connection line 500 is disposed, of a region overlapping the plurality of pixel substrates 115. [000143] Unlike general organic light emitting display apparatuses, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the cathode 253 may be patterned and formed to correspond to the plurality of pixel substrates 115. Therefore, each of a plurality of cathodes 253 disposed on the plurality of pixel substrates 115 may be independently supplied with a low level power through the connection line 500. This may denote that light for implementing an input image may be provided at a position corresponding to the pixel substrate 115. [000144] As described above, when the base substrate 111 is bent, stretched, or contracted, the reduction pattern 700 of the stretchable display apparatus 1000 according to an embodiment of the present disclosure may minimize a crack occurring in the connection line 500, thereby enhancing the reliability of the display panel 100. [000145] Therefore, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the reduction pattern 700 may be disposed adjacent to the connection line 500 electrically connecting the plurality of pixel substrates 115, thereby reducing a stress occurring in a curve region of the connection line 500. [000146] Moreover, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, a flexible characteristic may be secured by using the reduction pattern 700 disposed adjacent to the connection line 500, and a crack of the connection line 500 may be prevented, thereby enhancing the reliability of the display panel. [000147] FIG. 7 is a plan view illustrating a shape of a third reduction pattern of a stretchable display apparatus according to another embodiment of the present disclosure, and FIG. 8 is a plan view illustrating a shape of a third reduction pattern of a stretchable display apparatus 1000 according to another embodiment of the present disclosure. [000148] In describing FIGS. 7 and 8, repetitive descriptions are omitted, and for convenience of description, the following descriptions will be given with reference to FIGS. 7 and 8 in conjunction with FIGS. 1 to 6. [000149] Referring to FIGS. 7 and 8, the stretchable display apparatus 1000 according to an embodiment of the present disclosure may include a plurality of third reduction patterns 730-2 and 730-3, and the third reduction patterns 730-2 and 730-3 may be formed in a semicircular shape or an oval shape. [000150] The third reduction pattern 730-2 having an island pattern and a semicircular shape and the third reduction pattern 730-3 having an island pattern and an oval shape may be formed along an inner circumference surface ICP of a connection line 500 and may reduce a stress of a first shape region Q1. [000151] In a case where a third reduction pattern 730 is formed in a line shape or a dot shape of an island pattern, a structure corresponding to a shape of the inner circumference surface ICP of the connection line 500 may not be implemented, and thus, some stresses occurring in an inner circumference surface ICP of the first shape region Q1 may be transferred to a peripheral region. However, in a case where the third reduction pattern 730- 3 is formed in a shape corresponding to the inner circumference surface ICP of the first shape region Q1, the third reduction pattern 730-2 having a semicircular shape and the third reduction pattern 730-3 having an oval shape may efficiently reduce a stress occurring in the inner circumference surface ICP. [000152] Therefore, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, the reduction pattern 730 may be disposed adjacent to the connection line 500 electrically connecting a plurality of pixel substrates 115, and particularly, the third reduction pattern 730-2 having a semicircular shape and the third reduction pattern 730-3 having an oval shape may be disposed along the inner circumference surface ICP, thereby reducing a stress occurring in a curve region of the connection line 500. [000153] Moreover, in the stretchable display apparatus 1000 according to an embodiment of the present disclosure, a flexible characteristic may be secured by using the reduction pattern 730 disposed adjacent to the connection line 500 (particularly, the third reduction pattern 730-2 having a semicircular shape and the third reduction pattern 730-3 having an oval shape), and a crack of the connection line 500 may be prevented, thereby enhancing the reliability of the display panel 100. [000154] Therefore, when the base substrate 111 is bent, stretched, or contracted, the reduction pattern 730 of the stretchable display apparatus 1000 according to an embodiment of the present disclosure may minimize a crack occurring in the connection line 500, thereby enhancing the reliability of the display panel 100. [000155] FIG. 9 is a plan view illustrating a shape of a third reduction pattern of a stretchable display apparatus 1000 according to another embodiment of the present disclosure [000156] In describing FIG. 9, repetitive descriptions are omitted, and for convenience of description, the following descriptions will be given with reference to FIG. 9 in conjunction with FIGS. 1t0 6. [000157] Referring to FIG. 9, the stretchable display apparatus 1000 according to another embodiment of the present disclosure may include a reduction pattern 700, and the reduction pattern 700 may include a second reduction pattern 720, a third reduction pattern 730, and a connection pattern 750 connecting the second reduction pattern 720 to the third reduction pattern 730. [000158] The third reduction pattern 730 may be formed to have a line-shaped pattern along a second shape region Q2. Here, the third reduction pattern 730 is not limited to a line shape and a plurality of third reduction patterns 730 may be disposed along the second shape region Q2. Alternatively, as in FIGS. 7 and 8, the third reduction pattern 730 may be formed in an oval shape, and particularly, the third reduction pattern 730-3 having an oval shape of FIG. 8 may be disposed in a 90-degree-rotated direction. [000159] One side of an end portion of the third reduction pattern 730 may be disposed adjacent to an inner circumference surface ICP of a first shape region Q1, and the other side of the end portion of the third reduction pattern 730 may be disposed adjacent to an end portion of a second shape region Q2. [000160] An end portion of the other side of the third reduction pattern 730 may be connected to the connection pattern 750 and end portions of one side and the other side of the connection pattern 750 may connect end portions of a plurality of second reduction patterns 720, and thus, the connection pattern 750 may connect the second reduction pattern 720 to the third reduction pattern 730. [000161] The connection pattern 750 may be disposed at a portion (i.e., a boundary portion) at which the first shape region Q1 of a connection line 500 is connected to the second shape region Q2 of the connection line 500. Accordingly, the connection pattern 750 for reducing a stress may be formed up to a boundary portion of the first shape region Q1, thereby reducing a stress occurring in a curve region of the connection line 500. [000162] Therefore, in the stretchable display apparatus 1000 according to another embodiment of the present disclosure, the reduction pattern 700 may be disposed adjacent to the connection line 500 electrically connecting a plurality of pixel substrates 115, and particularly, the connection pattern 750 connecting the third reduction pattern 730 to the second reduction pattern 720 may be further disposed, thereby reducing a stress occurring in a curve region of the connection line 500. [000163] Moreover, in the stretchable display apparatus 1000 according to another embodiment of the present disclosure, a flexible characteristic may be secured by using the reduction pattern 700 disposed adjacent to the connection line 500 (particularly, the connection pattern 750 connecting the third reduction pattern 730 to the third reduction pattern 720), and a crack of the connection line 500 may be prevented, thereby enhancing the reliability of the display panel 100. [000164] Therefore, when a base substrate 111 is bent, stretched, or contracted, the reduction pattern 730 of the stretchable display apparatus 1000 according to another embodiment of the present disclosure may minimize a crack occurring in the connection line 500, thereby enhancing the reliability of the display panel 100. [000165] While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims. [Mode for Invention] [000166] Various embodiments have been described in the best mode for carrying out the present disclosure.

Claims

[CLAIMS]

1. A stretchable display apparatus comprising: a transistor substrate including a first region where a plurality of pixel substrates are disposed on a base substrate, and a second region where a surface of the base substrate is exposed between a plurality of first regions; a connection line connecting each of the plurality of pixel substrates to an adjacent pixel substrate and extending on the plurality of pixel substrates, and accordingly, disposed in the second region; and a reduction pattern disposed apart from the connection line in the second region, wherein the reduction pattern comprises: a first reduction pattern disposed in the second region to overlap the connection line disposed in the second region; and a second reduction pattern disposed apart from the first reduction pattern by a first interval to have a shape corresponding to a partial region along a shape of the connection line.

2. The stretchable display apparatus of claim 1, wherein each of the connection line and the first reduction pattern comprises a first shape region disposed in a wavy shape and a second shape region disposed in a rectilinear shape, the first shape region and the second shape region being provided as one body, and the second reduction pattern is disposed in a shape corresponding to an outer circumference surface of the first shape region.

3. The stretchable display apparatus of claim 2, wherein a third reduction pattern disposed to correspond to an inner circumference surface of the first shape region is further provided.

4. The stretchable display apparatus of claim 3, wherein the third reduction pattern is disposed in one shape selected from among an oval pattern, a semicircular pattern, a line pattern, and a combination shape thereof, which have an island shape along the inner circumference surface of the first shape region.

5. The stretchable display apparatus of claim 3, wherein the first to third reduction patterns comprise the same material.

8. The stretchable display apparatus of claim 3, wherein the second reduction pattern further comprises a connection pattern connecting the second reduction pattern to the third reduction pattern.

7. The stretchable display apparatus of claim 6, wherein one side of an end portion of the third reduction pattern is disposed adjacent to the inner circumference surface of the first shape region, and the other side of the end of the third reduction pattern is disposed adjacent to a boundary portion between the first shape region and the second shape region, an end portion of the other side of the third reduction pattern is connected to the connection pattern, and end portions of one side and the other side of the connection pattern connect end portions of a plurality of second reduction patterns.

8. The stretchable display apparatus of claim 1, wherein the first reduction pattern is disposed to contact a side surface of a corresponding pixel substrate of the plurality of pixel substrates.

9. The stretchable display apparatus of claim 1, wherein the first reduction pattern is disposed to have a thickness which is less than or equal to a thickness of each of the plurality of pixel substrates.

10. The stretchable display apparatus of claim 1, wherein the reduction pattern comprises one material selected from among polyimide (Pl)-based resin, epoxy-based resin, and a compound thereof each having the same flexibility as flexibility of the base substrate

11. The stretchable display apparatus of claim 1, wherein the first interval is within a range of about 0.01 um to about 4 um.

12. The stretchable display apparatus of claim 3, wherein the third reduction pattern and the connection line are disposed apart from each other by a second interval, and the second interval is within a range of about 0.01 xm to about 4 um.

13. The stretchable display apparatus of claim 1, wherein the connection line is provided in plurality, and the first reduction pattern is disposed to correspond to each of the plurality of connection lines.

14. The stretchable display apparatus of claim 1, wherein the transistor substrate comprises: a pixel substrate disposed in only a first region of the base substrate to have rigidity which is greater than rigidity of the base substrate; a buffer layer disposed on each of the plurality of pixel substrates; a transistor including a gate electrode disposed on the buffer layer, a gate line provided as one body with the gate electrode, a gate insulation layer disposed on the gate electrode, an active layer disposed on the gate insulation layer, an interlayer insulation layer disposed on the active layer, a source / drain electrode disposed on the interlayer insulation layer, a data line provided as one body with the source / drain electrode, and a planarization layer disposed on the source / drain electrode and the data line; a data line pad and a gate line pad disposed on the planarization layer and respectively connected to the data line and the gate line; and an organic light emitting device connected to the transistor, and the connection line comprises: a first connection line connected to the gate line pad to travel in a widthwise direction of the plurality of pixel substrates; and a second connection line connected to the data line pad to travel in a lengthwise direction of the plurality of pixel substrates.

15. The stretchable display apparatus of claim 14, wherein the buffer layer comprises one material selected from among silicon rubber including polydimethyisiloxane (PDMS), elastomer including polyurethane (PU), and a compound thereof.

16. The stretchable display apparatus of claim 14, wherein the organic light emitting device comprises: an anode connected to the transistor and disposed on the planarization layer; a bank including an opening portion exposing a portion of the anode and a contact hole exposing a portion of each of the data line pad and the gate line pad; an organic light emitting layer disposed on the anode exposed by the bank; and a cathode disposed on the organic light emitting layer, and the first connection line and the second connection line, respectively connected to the gate line pad and the data line pad each exposed through the contact hole, are disposed on the bank.

17. The stretchable display apparatus of claim 16, wherein the gate line pad, the data line pad, and the anode comprise the same material.

18. The stretchable display apparatus of claim 16, wherein the first connection line and the second connection line are disposed to contact a top surface and a side surface of the bank disposed on the plurality of pixel substrates, the planarization layer, the interlayer insulation layer, the gate insulation layer, the buffer layer, and side surfaces of the plurality of pixel substrates and to extend to a top surface of the first reduction pattern.

Images