KR20160054867A - Flexible organic light emitting display device and method for manufacturing the same - Google Patents

Abstract

A flexible organic light emitting display device according to an embodiment of the present invention includes a flexible substrate which has a pixel region including sub pixels, a planarization layer arranged on the flexible substrate, a first electrode on the planarization layer, a bank layer covering the edge of the first electrode, an organic light emitting layer arranged on the first electrode, and a second electrode arranged on the organic light emitting layer. A hole pattern is formed in at least one of the planarization and the bank layers. The hole pattern separates the at least one of the planarization layer and the bank layer from the flexible substrate. The flexible organic light emitting display device according to an embodiment of the present invention can prevent the generation of cracks in the planarization layer and the bank layer.

Description

TECHNICAL FIELD [0001] The present invention relates to a flexible organic light emitting display, and a flexible organic light emitting display,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible organic light emitting display and a method of manufacturing the same, and more particularly, to a flexible organic light emitting display capable of minimizing occurrence of cracks in a planarizing layer and a bank layer due to repetitive bending operations, .

2. Description of the Related Art In recent years, a flexible display device capable of displaying an image even if bent like paper by forming a display portion, wiring, or the like on a flexible substrate such as a flexible plastic material has been attracting attention as a next generation display device.

Flexible display devices have been applied to personal computers and monitors as well as personal portable devices. Therefore, flexible display devices having a large display area and reduced volume and weight have been studied. Particularly, since an organic light emitting display (OLED) does not require a separate light source unlike a liquid crystal display (LCD), it can be implemented with a relatively thin thickness, As a flexible display device.

A planarization layer is generally disposed on a flexible substrate of a flexible organic light emitting display. Then, after the first electrode, such as the anode, is disposed on the planarization layer, the bank layer is generally disposed on the planarization layer and to cover the edge of the first electrode. Each of the planarization layer and the bank layer is made of an insulating material, and the planarization layer functions to flatten a step due to a thin film transistor or the like, and the bank layer performs a role of dividing a sub pixel region. The planarizing layer is disposed as a single continuous layer on the entire surface of the flexible substrate, and the bank layer is also disposed as a single continuous layer having a mesh shape on the entire surface of the flexible substrate.

Since the flexible organic light emitting display device is constructed so as to be capable of bending, it has various problems due to repetitive bending. Particularly, the problem of frequent occurrence of cracks in the bank layer and the planarization layer due to repetitive bending has been emphasized. This is because the bank layer and the planarization layer are adjacent to the organic light emitting layer and the thin film transistor and when the cracks generated in the bank layer and the planarization layer propagate to the organic light emitting layer or the thin film transistor, the reliability of the flexible organic light emitting display is greatly reduced to be.

 [Related Technical Literature]

1. Display device and its manufacturing method (Patent Application No. 10-2009-0124052)

The inventors of the present invention have recognized the problems of the conventional flexible organic light emitting diode display as described above and can minimize the occurrence of cracks in the bank layer and the planarization layer and reduce the cracks already generated in the bank layer and the planarization layer Emitting layer or a thin-film transistor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flexible organic light emitting display device and a method of manufacturing the same that can reduce the possibility of cracking in a bank layer and a planarization layer.

Another object of the present invention is to provide a flexible organic light emitting display capable of minimizing the propagation of cracks generated in the bank layer and the planarizing layer to adjacent components and a method of manufacturing the same.

Another object of the present invention is to provide a flexible organic light emitting display having excellent lifetime characteristics and reliability and a method of manufacturing the same.

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

According to an aspect of the present invention, there is provided a flexible organic light emitting display including a flexible substrate having a pixel region including a plurality of sub-pixel regions, a planarization layer disposed on the flexible substrate, A bank layer disposed to cover an edge of the first electrode, an organic light emitting layer disposed on the first electrode, and a second electrode disposed on the organic light emitting layer, wherein the planarization layer and the bank layer And at least one of the planarization layer and the bank layer is separated and disposed on the flexible substrate by the hole pattern. The flexible organic light emitting display device according to an embodiment of the present invention has an advantage of suppressing the occurrence of cracks in the planarization layer and the bank layer.

According to another aspect of the present invention, only the planarization layer among the planarization layer and the bank layer can be disposed separately on the flexible substrate.

According to another aspect of the present invention, the bank layer is characterized by filling the hole pattern.

According to another aspect of the present invention, both the planarization layer and the bank layer can be disposed separately on the flexible substrate.

According to still another aspect of the present invention, only the bank layer of the planarization layer and the bank layer can be disposed separately on the flexible substrate.

According to another aspect of the present invention, the minimum width of the hole pattern may be 1 [mu] m to 50 [mu] m.

According to another aspect of the present invention, the planarization layer may comprise photosensitive photoacryl or photosensitive polyimide.

According to another aspect of the present invention, the bank layer may be made of polyimide, photoacrylic or benzocyclobutene (BCB).

According to another aspect of the present invention, the hole pattern may have a mesh structure.

According to another aspect of the present invention, at least one of the planarization layer and the bank layer may be disposed separately on a flexible substrate by one sub pixel region.

According to another aspect of the present invention, at least one of the planarization layer and the bank layer may be disposed separately on a flexible substrate for each pixel region.

According to another aspect of the present invention, the occurrence of cracks in at least one of the planarization layer and the bank layer is minimized by the hole pattern, and propagation of cracks generated in at least one of the planarization layer and the bank layer can be suppressed.

According to another aspect of the present invention, there is provided a method of fabricating a flexible organic light emitting display, including: disposing a planarization layer on a flexible substrate; forming a planarization layer on the flexible substrate, Forming a hole pattern in the planarization layer, disposing a first electrode in the planarization layer, disposing the bank layer so as to cover the edge of the first electrode and fill the hole pattern, disposing the organic light- And a step of disposing a second electrode on the organic light emitting layer. The flexible organic light emitting display device having excellent lifetime characteristics and reliability can be manufactured by using the manufacturing method of the flexible organic light emitting display device according to an embodiment of the present invention.

According to another aspect of the present invention, there is provided a method of manufacturing a flexible organic light emitting display, wherein the step of forming a hole pattern in the planarization layer is performed using a photoresist pattern.

According to another aspect of the present invention, there is provided a method of fabricating a flexible organic light emitting display, including: disposing a planarization layer on a flexible substrate; disposing a first electrode on the planarization layer; Forming a hole pattern in the bank layer so that the bank layer is separated and disposed on the flexible substrate; disposing an organic light-emitting layer on the first electrode; And disposing a second electrode on the second electrode. It is possible to manufacture a flexible organic light emitting display capable of suppressing propagation of cracks generated in the planarization layer and the bank layer to adjacent components by using the manufacturing method of a flexible organic light emitting display device according to another embodiment of the present invention .

According to another aspect of the present invention, forming the hole pattern in the bank layer may include forming a hole pattern in both the bank layer and the planarizing layer such that both the bank layer and the planarizing layer are separately disposed on the flexible substrate have.

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

The present invention has the effect of minimizing the occurrence of cracks in the planarization layer or the bank layer due to repetitive bending.

The present invention has the effect of preventing cracks inevitably generated in the planarizing layer and the bank layer from propagating to the organic light emitting layer or the thin film transistor.

The present invention has an effect of providing a flexible organic light emitting display device which can be used for a long time with high reliability.

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

1A is a schematic plan view of a top emission type flexible organic light emitting display according to an embodiment of the present invention.
FIG. 1B is a schematic cross-sectional view of a flexible organic light emitting display device according to Ib-Ib of FIG. 1A.
1C is a schematic plan view showing only a pixel region, a flexible substrate, and a planarization layer in the flexible organic light emitting display of FIG. 1A.
2A is a schematic cross-sectional view of a flexible organic light emitting display according to another embodiment of the present invention.
FIG. 2B is a schematic plan view showing only a pixel region, a flexible substrate, an anode, and a bank layer in the flexible organic light emitting display of FIG. 2A.
3 is a schematic cross-sectional view of a flexible organic light emitting display according to another embodiment of the present invention.
Fig. 4 is a view for explaining the stress applied to the second layer when the adjacent first and second continuous layers are bent; Fig.
5 is a view for explaining the stress applied to the second layer when the first layer and the second layer which are adjacent to each other and are separated from each other are bent.
6 is a schematic cross-sectional view for explaining another effect of the present invention.
7 is a flowchart illustrating a method of manufacturing a flexible organic light emitting display according to an embodiment of the present invention.
FIGS. 8A to 8D are cross-sectional views for explaining a manufacturing method of the flexible organic light emitting display device of FIG.
9 is a flowchart illustrating a method of manufacturing a flexible organic light emitting display according to another embodiment of the present invention.
FIGS. 10A to 10D are cross-sectional views for explaining a manufacturing method of the flexible organic light emitting display of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

An element or layer is referred to as being another element or layer "on ", including both intervening layers or other elements directly on or in between.

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

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1A is a schematic plan view of a top emission type flexible organic light emitting display according to an embodiment of the present invention.

Referring to FIG. 1A, a flexible organic light emitting display 110 according to an exemplary embodiment of the present invention includes a plurality of pixel regions P. Referring to FIG. Each of the plurality of pixel regions P includes a plurality of sub pixel regions R, G, and B as regions for displaying one color. 1A, one pixel region P may include a first sub-pixel region R, a second sub-pixel region G, and a third sub-pixel region B. As shown in FIG. Light of different colors is emitted in each of the first sub pixel region R, the second sub pixel region G and the third sub pixel region B. Specifically, any one of red, green, and blue light is emitted And is emitted.

1B is a schematic cross-sectional view of a flexible organic light emitting diode display device according to a first embodiment of the present invention. FIG. 1C is a schematic plan view showing only a pixel region, a flexible substrate, and a planarization layer in the flexible organic light emitting display device of FIG. to be.

1B and 1C, a flexible organic light emitting diode display 100 according to an exemplary embodiment of the present invention includes a flexible substrate 110, a buffer layer 120, a thin film transistor, a gate insulating layer 130, an active layer The first electrode 160, the bank layer 170, the organic light emitting layers 180a, 180b, and 180c, and the second electrode 190. The first electrode 160 and the second electrode 190 are formed on the first electrode 160 and the second electrode 190, respectively.

The flexible substrate 110 serves to support and protect various components of the flexible organic light emitting display 110. The flexible substrate 110 may be made of a material having flexibility, for example, a polyimide series material so that bending can be performed.

A buffer layer 120 is disposed on the flexible substrate 110. The buffer layer 120 prevents penetration of moisture or impurities through the flexible substrate 110 and flattens the upper portion of the flexible substrate 110. However, the buffer layer 120 is not necessarily required. Whether or not the buffer layer 120 is formed is determined based on the type of the substrate and the type of the thin film transistor used in the organic light emitting display. The buffer layer 120 may be formed of a transparent material.

A thin film transistor is disposed on the buffer layer 120. The thin film transistor is connected to the first electrode 160 to drive the flexible organic light emitting display 110. The thin film transistor includes an active layer 132 formed on the buffer layer 120, a gate electrode 142 formed on the gate insulating layer 130, a source electrode and a drain electrode 144 formed on the interlayer insulating layer 140 do. In FIG. 1B, the thin film transistor has a coplanar structure for the sake of convenience. However, the thin film transistor may be formed in an inverted staggered structure.

A planarization layer 150 is disposed on the buffer layer 120 and the thin film transistor. The planarization layer 150 is a layer for planarizing the upper portion of the flexible substrate 110, which is also referred to as an overcoat layer. In order to planarize the upper portion of the flexible substrate 110, the planarization layer 150 may be formed of an organic material, for example, a photosensitive photo-acryl or a photosensitive polyimide. In the planarization layer 150, a contact hole for electrically connecting the source electrode of the thin film transistor and the first electrode 160 is formed.

A hole pattern 152 is formed in the planarization layer 150. As shown in Fig. 1C, the hole pattern 152 has a mesh structure. The planarization layer 150 is separated and disposed on the flexible substrate 110 by the hole pattern 152. 1B and 1C, the planarization layer 150 is divided into one sub-pixel region (R, G, B) on the flexible substrate 110 by the hole pattern 152, In other words, are independently arranged in each of the plurality of sub pixel regions (R, G, B).

The minimum width of the hole pattern 152 is preferably about 1 to 50 mu m so as to effectively prevent cracks generated in a part of the separated planarization layer 150 from propagating to the organic light emitting layers 180a, 180b, 180c, Lt; / RTI > However, the numerical values relating to the minimum widths of the hole patterns 152 are only exemplary and are not necessarily limited thereto.

A first electrode 160 is disposed on the planarization layer 150. The first electrode 160 serves to apply a voltage to the organic light emitting layers 180a, 180b and 180c. 1B, the first electrode 160 is independently arranged in each of the plurality of sub-pixel regions R, G, and B. In other words, the first electrodes 160 are arranged separately for the sub-pixel regions R, G, and B.

The first electrode 160 may be an anode or a cathode. In this regard, the second electrode 190, which will be described later, may be a cathode when the first electrode 160 is an anode, and may be an anode when the first electrode 160 is a cathode. It will be understood by those skilled in the art that the first electrode 160 and the second electrode 190 can be easily changed in the vertical position. Therefore, in the following description, the first electrode 160 is an anode, It is assumed that the cathode 190 is a cathode.

The first electrode 160 may be made of a transparent conductive material having a high work function as an anode. For example, the first electrode 160 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide ), And tin oxide (Tin Oxide). The first electrode 160 may include a transparent conductive material having a high work function and a reflective plate. In FIG. 1B, for convenience of illustration, the first electrode 160 is represented as a single layer.

The bank layer 170 is disposed on the flexible substrate 110 so as to cover the edge of the first electrode 160. 1B, the bank layer 170 is arranged to fill the hole pattern 152 formed in the planarization layer 150. [0050] As shown in FIG. The bank layer 170 serves to divide the plurality of sub-pixel regions R, G, and B. The bank layer 170 may be made of a transparent organic material, for example, polyimide, photoacrylic, benzocyclobutene (BCB), or a material that exhibits black, for example, a black resin.

Organic light emitting layers 180a, 180b and 180c are disposed on the first electrode 160. [ The organic light emitting layers 180a, 180b, and 180c receive the voltage from the first electrode 160 and the second electrode 190 to emit light. Although not shown in FIG. 1B, the organic emission layers 180a, 180b, and 180c may include a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. 1B, the organic light emitting layers 180a, 180b and 180c are separately arranged in the first sub pixel region R, the second sub pixel region G and the third sub pixel region B, The organic light emitting layers 180a, 180b and 180c may be disposed in common in the first sub pixel region R, the second sub pixel region G and the third sub pixel region B. [

A second electrode 190 is disposed on the organic light emitting layers 180a, 180b, and 180c. The second electrode 190 is disposed in common to the first sub pixel region R, the second sub pixel region G and the third sub pixel region B. The second electrode 190 may be connected to a separate power supply voltage line to apply the same voltage to all the sub-pixel regions R, G, and B. The second electrode 190 may be formed of a metal material having a low work function such as silver (Ag), titanium (Ti), aluminum (Al), molybdenum (Mo), or an alloy of silver (Ag) .

1B and 1C, the planarization layer 150 is illustrated as being separated on one sub-pixel region R, G, B on the flexible substrate 110. However, the planarization layer 150 may be formed on the flexible substrate 110 And may be separated per pixel region P. Furthermore, the planarization layer 150 may be divided into a plurality of pixel regions P on the flexible substrate 110.

FIG. 2A is a schematic cross-sectional view of a flexible organic light emitting display according to another embodiment of the present invention, and FIG. 2B is a schematic view showing only a pixel region, a flexible substrate, an anode, and a bank layer in the flexible organic light emitting display of FIG. FIG. The flexible organic light emitting display device 200 of FIG. 2A differs from the flexible organic light emitting display device 100 of FIG. 1A only in that the hole pattern 272 is formed only on the bank layer 270, and the other structures are substantially the same Duplicate description is omitted.

2A and 2B, in a flexible organic light emitting display device 200 according to another embodiment of the present invention, a hole pattern is not formed in the planarization layer 250, and a hole pattern 272 Is formed. Thus, the bank layer 270 is separated and arranged on the flexible substrate 110 by the hole pattern 272. 2A and 2B, the bank layer 270 is divided into one sub-pixel region (R, G, B) on the flexible substrate 110 by the hole pattern 272, In other words, are independently arranged in each of the plurality of sub pixel regions (R, G, B).

As shown in FIG. 2A, the hole pattern 272 formed in the bank layer 270 may fill the second electrode 190.

3 is a schematic cross-sectional view of a flexible organic light emitting display according to another embodiment of the present invention. The flexible organic light emitting display 300 of FIG. 3 is different from the flexible organic light emitting display 100 of FIG. 1A only in that the hole pattern 352 is formed in both the planarization layer 350 and the bank layer 360 Other configurations are substantially the same, so duplicate descriptions are omitted.

Referring to FIG. 3, in the flexible organic light emitting display device 300 according to another embodiment of the present invention, not only the planarization layer 350 but also the bank layer 360, that is, the planarization layer 350 and the bank layer 360 are formed with a hole pattern 352. [ Accordingly, both the planarization layer 350 and the bank layer 360 are separated and arranged on the flexible substrate 110 by the hole pattern 352. 3, the planarization layer 350 and the bank layer 360 are separated from each other by a hole pattern 352 in one sub-pixel region (R, G, B) on the flexible substrate 110. As shown in FIG. In other words, are independently arranged in each of the plurality of sub pixel regions (R, G, B).

3, the hole pattern 352 formed in the planarization layer 350 and the bank layer 360 may be filled in the second electrode 190.

In the flexible organic light emitting display device of the present invention, at least one of the planarization layer and the bank layer made of an organic material is arranged on the flexible substrate by a hole pattern. Therefore, advantageous effects as compared with the conventional flexible organic light emitting display, in which the planarizing layer and the bank layer are not arranged separately from each other on the entire surface of the flexible substrate but arranged in one continuous layer, can be achieved have.

4 and 5 are views for explaining an advantageous effect of the present invention. 4 is a view for explaining the stress applied to the second layer when the adjacent first and second adjacent layers are bent, and FIG. 5 is a view for explaining stress applied to the second layer when the adjacent first and second layers are bent, And the stress applied to the second layer when the second layer is bent.

4, when the continuous second layer 404 is disposed on the continuous first layer 402, the stress? _Top applied to the second layer 404 is calculated by the following equation And if the stress applied to the second layer 404 exceeds a certain threshold value, cracks will occur in the second layer 404.

D2 is the thickness of the second layer; X is Y2 / Y1; Y1 is the Young's modulus of the first layer; Y2 is the Young's modulus of the first layer; ≪ / RTI > According to the above equation, it can be seen that the stress applied to the second layer 404 is determined according to the radius of curvature of the second layer 404.

In the conventional flexible organic light emitting display device, since the planarization layer and the bank layer are disposed as one continuous layer over the entire surface of the flexible substrate, in other words, both edges of the planarization layer and the bank layer and the center portion of the planarization layer and the bank layer are connected The radius of curvature R becomes relatively large when the flexible organic light emitting display device is bent. Therefore, a large stress is applied to the planarizing layer and the bank layer due to repetitive bending operations, and cracks are generated with high probability in the planarizing layer and the bank layer.

However, if the first layer 502 and the second layer 504 are separated from each other as shown in FIG. 5, even if the first layer 502 and the second layer 504 are bent at the same radius of curvature R as shown in FIG. 4, 502 and the second layer 504 and the central portion of the first layer 506 and the second layer 508 are separated from each other so that one unit first layer 506 and one unit The second layer 508 is bent at a very large radius of curvature. Therefore, even if repetitive bending operations are performed, a relatively small stress is applied to the first layer 502 and the second layer 504, and a crack is generated with a smaller probability.

The above effects can be similarly applied to the flexible organic light emitting displays 100, 200, and 300 of the present invention. In other words, in the flexible organic light emitting displays 100, 200, and 300 of the present invention, at least one of the planarization layers 150, 250, 350 and the bank layers 170, 270, A relatively small amount of stress is applied to the planarization layers 150, 250, 350 or the bank layers 170, 270, 370 even if repetitive bending operations are performed, and cracks are generated with a smaller probability.

6 is a schematic cross-sectional view for explaining another effect of the present invention.

6, when the second layer 604 separated from each other on the first layer 602 is disposed, the width of the cracks generated in the first layer 602 is smaller than the width of the cracks generated in the segment 602 of the second layer 604 segment length (S).

Because of this fact, in the conventional flexible organic light emitting display device in which the bank layer and the planarization layer are disposed as one continuous layer over the entire surface of the flexible substrate, a very wide width crack is generated in the bank layer, the planarization layer, . Since a wide width of cracks is more likely to damage wires and the like than a width of a small width of cracks, a wide width of cracks is a major cause of deteriorating the reliability of the flexible organic light emitting display.

However, in the flexible organic light emitting displays 100, 200 and 300 according to the present invention, at least one of the planarization layers 150, 250 and 350 and the bank layers 170, 270 and 370 are separated from each other on the flexible substrate 110 The width of such a crack is reduced even if cracks are generated in the planarization layers 150, 250, 350 or the bank layers 170, 270, 370 and adjacent layers thereof. Therefore, it is possible to reduce the possibility of damaging the wiring due to the crack caused by the repeated bending operation.

In the conventional organic light emitting display device, since the bank layer and the planarization layer are not arranged separately from each other on the entire surface of the flexible substrate, but are arranged in one continuous layer, the bank layer and a part of the planarization layer There is a problem that the generated crack easily propagates to the organic light emitting layer or the thin film transistor along the continuous bank layer and the planarization layer.

However, in the flexible organic light emitting displays 100, 200 and 300 of the present invention, at least one of the planarization layers 150, 250 and 350 and the bank layers 170, 270 and 370 is separated from the flexible substrate 110 250 or 350 or the bank layers 170, 270 and 370 as well as less cracks in the planarization layers 150, 250 and 350 or the bank layers 170, 270 and 370, 270, and 370, the propagation path is initially blocked, and the generated crack can not be easily propagated to the organic light emitting layers 180a, 180b, and 180c or the thin film transistor. Accordingly, the flexible organic light emitting displays 100, 200, and 300 of the present invention can have excellent lifetime characteristics and reliability.

7 is a flowchart illustrating a method of manufacturing a flexible organic light emitting display according to an embodiment of the present invention. 8A to 8D are cross-sectional views illustrating a manufacturing method of the flexible organic light emitting display of FIG.

Referring to FIG. 8A, a planarization layer 150 is disposed on a flexible substrate 110 including a plurality of sub-pixel regions R, G, and B (S710). The buffer layer 110 and the thin film transistor may be disposed on the flexible substrate 110 before the planarizing layer 150 is disposed.

Referring to FIG. 8B, a hole pattern 152 is formed in the planarization layer 150 such that the planarization layer 150 is separated and disposed on the flexible substrate 110 (S720). After forming a photoresist pattern on the planarization layer 150 to form the hole pattern 152 in the planarization layer 150, a part of the planarization layer 150 is etched with the etching solution to form the hole pattern 152, May be used.

Referring to FIG. 8C, a first electrode 160 is disposed on the planarization layer 150 (S730), a bank layer 170 is formed to cover the edge of the first electrode 160 and to fill the hole pattern 152 (S740). The first electrode 160 and the bank layer 170 may be disposed using a patterned mask.

8D, the organic light emitting layers 180a, 180b and 180c are disposed on the first electrode 160 in step S750 and the second electrode 190 is disposed on the organic light emitting layers 180a, 180b and 180c (S760). The organic light emitting layers 180a, 180b and 180c may also be arranged using a patterned mask.

9 is a flowchart illustrating a method of manufacturing a flexible organic light emitting display according to another embodiment of the present invention. 10A and 10B are cross-sectional views illustrating the manufacturing method of the flexible organic light emitting display of FIG.

Referring to FIG. 10A, a planarization layer 250 is disposed on a flexible substrate 110 including a plurality of sub-pixel regions R, G, and B (S910). The buffer layer 110 and the thin film transistor may be disposed on the flexible substrate 110 before the planarization layer 250 is disposed. The planarization layer 250 is disposed in common to the plurality of sub pixel regions R, G,

Referring to FIG. 10B, the first electrode 160 is disposed on the planarization layer 250 (S720), and the bank layer 270 is disposed to cover the edge of the first electrode 160 (S730).

Referring to FIG. 10C, a hole pattern 272 is formed in the bank layer 270 such that the bank layer 270 is separated and disposed on the flexible substrate 110 (S950). Accordingly, the planarization layer 250 can be exposed through the hole pattern 272. [ The hole pattern 272 of the bank layer 270 may be formed using a photoresist pattern.

10D, the organic light emitting layers 180a, 180b and 180c are disposed on the first electrode 160 in step S960 and the second electrode 190 is disposed on the organic light emitting layers 180a, 180b and 180c (S970). The second electrode 190 is arranged to fill the hole pattern 272.

In another embodiment of the present invention in which a hole pattern is formed not only in the bank layer but also in the planarization layer and in both the bank layer and the planarization layer when the hole pattern is formed in the bank layer A flexible organic light emitting display according to the present invention can be manufactured.

Although the foregoing description has been made with respect to the organic light emitting display device of the top emission type, the pixel array structure of the present invention can be equally applied to the bottom emission organic light emitting display device.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100, 200, 300: Flexible organic light emitting display
110: Flexible substrate
120: buffer layer
130: gate insulating layer
132: active layer
140: interlayer insulating layer
142: gate electrode
144: source electrode and drain electrode
150, 250, 350: planarization layer
152, 272, 352: hole patterns
160: first electrode
170, 270, 370: bank layer
180a, 180b and 180c: organic light-
190: second electrode
402, 502, 602: first layer
404, 504, 604: Second layer
506: unit first layer
508: unit second layer
P: pixel area
R: first sub pixel region
G: second sub pixel region
B: the third sub pixel region

Claims (16)

A flexible substrate having a pixel region including a plurality of sub pixel regions;
A planarization layer disposed on the flexible substrate;
A first electrode disposed on the planarization layer;
A bank layer disposed to cover an edge of the first electrode;
An organic light emitting layer disposed on the first electrode; And
And a second electrode disposed on the organic light emitting layer,
A hole pattern is formed in at least one of the planarization layer and the bank layer,
Wherein at least one of the planarization layer and the bank layer is disposed separately on the flexible substrate by the hole pattern. The method according to claim 1,
Wherein only the planarizing layer of the planarizing layer and the bank layer is disposed separately on the flexible substrate. 3. The method of claim 2,
Wherein the bank layer fills the hole pattern. The method according to claim 1,
Wherein both the planarization layer and the bank layer are disposed separately on the flexible substrate. The method according to claim 1,
Wherein only the bank layer among the planarization layer and the bank layer is disposed separately on the flexible substrate. The method according to claim 1,
Wherein a minimum width of the hole pattern is 1 占 퐉 to 50 占 퐉. The method according to claim 1,
Wherein the planarization layer is made of photosensitive photoacryl or photosensitive polyimide. The method according to claim 1,
Wherein the bank layer is made of polyimide, photoacrylic or benzocyclobutene (BCB). The method according to claim 1,
Wherein the hole pattern has a mesh structure. The method according to claim 1,
Wherein at least one of the planarization layer and the bank layer is disposed separately on one sub-pixel region on the flexible substrate. The method according to claim 1,
Wherein at least one of the planarization layer and the bank layer is disposed separately for each pixel region on the flexible substrate. The method according to claim 1,
Wherein cracks in at least one of the planarizing layer and the bank layer are minimized by the hole pattern and propagation of a crack generated in at least one of the planarizing layer and the bank layer is suppressed, Emitting display device. Disposing a planarization layer on the flexible substrate;
Forming a hole pattern in the planarization layer such that the planarization layer is separated and disposed on the flexible substrate;
Disposing a first electrode in the planarization layer;
Disposing a bank layer to cover the edge of the first electrode and fill the hole pattern;
Disposing an organic light emitting layer on the first electrode; And
And disposing a second electrode on the organic light emitting layer. 13. The method of claim 12,
Wherein the step of forming a hole pattern in the planarization layer is performed using a photoresist pattern. Disposing a planarization layer on the flexible substrate;
Disposing a first electrode on the planarization layer;
Disposing a bank layer to cover an edge of the first electrode;
Forming a hole pattern in the bank layer so that the bank layer is separated and disposed on the flexible substrate;
Disposing an organic light emitting layer on the first electrode; And
And disposing a second electrode on the organic light emitting layer. 16. The method of claim 15,
The step of forming the hole pattern in the bank layer includes forming the hole pattern in both the bank layer and the planarization layer such that both the bank layer and the planarization layer are separated and arranged on the flexible substrate Wherein the organic light emitting display device is a flexible organic light emitting display device.

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