KR20180003972A - Organic Light Emitting Display Device - Google Patents

Abstract

According to the present invention, disclosed is an organic light emitting device which can exhibit better light extraction efficiency. According to an embodiment of the present invention, the organic light emitting device realizes a micro lens structure with an overcoating layer including two or more linear concave units and two or more linear convex units. According to another embodiment of the present invention, the organic light emitting device realizes a micro lens structure with an overcoating layer including two or more concave units and two or more convex units, and the plan view of the concave and convex units is one among a multi-shape, a plurality of multi-shapes with different centers, and a spiral shape or a combination thereof.

Description

[0001] The present invention relates to an organic light-

The present invention relates to an organic light emitting device for emitting light.

The organic light emitting device including the organic light emitting element is a self light emitting type device and can be manufactured in a thin and lightweight form. Further, the organic light emitting device is not only advantageous from the viewpoint of power consumption by low voltage driving but also excellent in hue of color, response speed, viewing angle, and contrast ratio (CR), and is being studied as a next generation display.

Light emitted from the organic light emitting layer of the organic light emitting device passes through various components of the organic light emitting device and is emitted to the outside of the organic light emitting device. However, among the light emitted from the organic light emitting layer, light that is trapped inside the organic light emitting device can not be emitted to the outside of the organic light emitting device, so that the light extraction efficiency of the organic light emitting device becomes a problem.

For example, in the organic light emitting device of the organic light emitting device, total reflection or light absorption by the anode electrode in the organic light emitting device is confined within the organic light emitting device, and the light emitted from the organic light emitting layer is about 50% Or light absorbed and confined in the organic light emitting device is about 30% of the light emitted from the organic light emitting layer.

As described above, about 80% of the light emitted from the organic light emitting layer is confined within the organic light emitting device, and only about 20% of the light is extracted to the outside, so that the light efficiency of the organic light emitting device is very low.

In order to improve the light extraction efficiency of such an organic light emitting device, a method of forming a micro lens array (MLA) on an overcoat layer of an organic light emitting device has been proposed. However, even though the microlens array is formed in the overcoat layer of the organic light emitting device, there is a problem that the amount of light (light amount) extracted to the outside is small because the light trapped in the device is large.

Therefore, there is a demand for an organic light emitting device capable of improving light emission efficiency and light extraction efficiency.

In order to solve the above problems, an embodiment of the present invention is to provide an organic light emitting device capable of further improving light extraction efficiency.

According to an embodiment of the present invention, there is provided an organic light emitting device including a substrate divided into a light emitting region and a non-emitting region, an overcoat layer disposed on the substrate, a first electrode disposed on the overcoat layer, An organic light emitting layer disposed on the first electrode, and a second electrode disposed on the organic light emitting layer.

The overcoat layer according to one embodiment may include two or more concave portions and two or more convex portions that are linear in plan view. The two or more concave portions and the two or more convex portions may be one of a zigzag shape, a straight shape, a wire shape, or a combination thereof in a planar manner.

According to another embodiment, the two or more concave portions and the two or more convex portions may be one of a multiple shape in plan view, a plurality of multiple shapes having different centers, a spiral shape, or a combination thereof.

The organic light emitting device according to the embodiment of the present invention minimizes the pitch between the concave portions or the convex portions included in the overcoat layer to increase the total light emitting area of the light emitting region, have.

1 is a view schematically showing a display device according to embodiments.
2 is a cross-sectional view of an organic light emitting device to which a microlens is applied.
3 is a plan view of an organic light emitting device to which a microlens is applied.
4 is a cross-sectional view of the organic light emitting device to which a microlens is applied, taken along line AB.
Figs. 5 and 6 show the shapes on the plane of the concave and convex portions of the overcoat layer.
Figures 7A and 7B illustrate the failure of the overcoat layer when the area of the exposed area of the mask is reduced in the process.
FIGS. 8A and 8B show defects of the overcoat layer when they are reduced in the process to the area of the unexposed area of the mask.
9 is a plan view of an organic light emitting device according to an embodiment.
10 is a cross-sectional view taken along line EF in Fig.
Fig. 11 shows another example of the direction of the concave portion and the convex portion of the overcoat layer in Fig.
12 is an enlarged plan view of a portion A in Fig.
Figs. 13 and 14 show other examples of the shapes of the concave and convex portions of the overcoat layer in Fig.
15A to 15D are plan views of an organic light emitting device according to another embodiment.
Figs. 16A to 16B show other examples of the shapes of the concave and convex portions of the overcoat layer of Figs. 15A to 15D.
Figs. 17A to 17B show other examples of the shapes of the concave and convex portions of the overcoat layer of Figs. 15A to 15D.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components.

1 is a view schematically showing an organic light emitting device according to embodiments.

Referring to FIG. 1, an organic light emitting device 100 according to an exemplary embodiment of the present invention may include a plurality of light emitting devices including an organic light emitting device or an organic light emitting device including two electrodes and an organic layer between the two electrodes.

The organic light emitting device 100 may be an organic light emitting display for displaying an image, a lighting device, a light source, or the like. For example, when the organic light emitting device 100 is an OLED display, a bottom emission display device, a top emission display device, a dual emission display device, a flexible display device, a transparent display device, And the present invention is not limited thereto.

If the organic light emitting device 100 is a lighting device, it can be applied to the above-described lighting devices in combination with an indoor or outdoor lighting device, a vehicle lighting device, or the like. For example, automotive lighting devices include headlights, high beams, taillights, brake lights, back-up lights, brake lights, fog lamps, A turn signal light, and an auxiliary lamp, but the present invention is not limited thereto.

When the organic light emitting device 100 is a light source, for example, a backlight of a liquid crystal display (LCD), a light source such as various sensors for illumination, a printer, a copying machine, A light source, a decoration, or various lights.

Hereinafter, the organic light emitting device 100 will be described as an organic light emitting display device, but the present invention is not limited thereto and may be an illumination device or a light source.

1, the organic light emitting device 100 according to the embodiments includes a plurality of first lines VL1 to VLm formed in a first direction and a plurality of second lines HL1 to HLn A first driver 120 for supplying a first signal to a plurality of first lines VL1 to VLm and a second driver 120 for supplying a second signal to a plurality of second lines HL1 to HLn, A controller 140 for controlling the second driver 130, the first driver 120 and the second driver 130, and the like.

The first driver 120 may be a data driver for supplying a data voltage to a data line. The second driver 130 may be a gate driver for supplying a scan signal to the gate line.

A plurality of pixels P are defined in accordance with the intersection of the first lines VL1 to VLm formed in the first direction and the plurality of second lines HL1 to HLn formed in the second direction. do.

An electrode connected to the thin film transistor for controlling light emission of each pixel region of the panel 110 is referred to as a first electrode and an electrode disposed on the entire surface of the panel 110 or arranged to include two or more pixel regions is referred to as a second electrode do. When the first electrode is an anode electrode, the second electrode is a cathode electrode, and vice versa. Hereinafter, an anode electrode according to an embodiment of the first electrode will be described with reference to a cathode electrode as an embodiment of the second electrode, but the present invention is not limited thereto.

Each pixel includes one or more subpixels, for example three or four subpixels. The sub-pixel means a unit in which a specific kind of color filter is formed, or a color filter is not formed, and the organic light emitting element can emit a specific color. (R), green (G), blue (B), and optionally white (W) as the color defined by the sub-pixel, but the present invention is not limited thereto. Each sub-pixel includes a separate thin film transistor and an electrode connected thereto.

In addition, a light-scattering layer may be disposed in the light emitting region in each sub-pixel to enhance light extraction efficiency of the organic light emitting layer. The light scattering layer may be referred to as a microlens array, a nano pattern, a diffuse pattern, or a silica bead.

Hereinafter, the microlens array will be mainly described as embodiments of the scattering layer, but the embodiments according to the present invention are not limited thereto. In the embodiments of the present invention, various structures for scattering light may be applied in combination .

2 is a cross-sectional view of an organic light emitting device to which a microlens is applied.

2, an organic light emitting device 200 to which a microlens is applied includes a thin film transistor 220 on a substrate 210 and an organic light emitting diode 230 electrically connected to the thin film transistor 220.

The substrate 210 may be divided into a light emitting region EA and a non-light emitting region NEA. The thin film transistor 220 may be located in the non-emission region NEA and the organic light emitting diode 230 may be located in the emission region EA.

The thin film transistor 220 includes an active layer 222, a gate electrode 224, a source electrode 226, and a drain electrode 228. A gate insulating film 223 is disposed between the active layer 222 and the gate electrode 224.

The organic light emitting device 230 includes a first electrode 232, an organic light emitting layer 234, and a second electrode 236.

An interlayer insulating film 240 is disposed on the gate electrode 224. The source electrode 226 and the drain electrode 228 are in contact with the active layer 222 through the first and second contact holes 242 and 244 existing in the interlayer insulating layer 240. A protective layer 250 is disposed on the source electrode 226 and the drain electrode 228.

An overcoat layer 260 is disposed on the substrate 210 including the protective layer 250. A first electrode 232 of the organic light emitting diode 230 connected to the drain electrode 226 of the thin film transistor 220 is disposed on the overcoat layer 260. On the overcoat layer 260, a bank 270 defining a pixel by exposing a part of the first electrode 232 is disposed. The organic light emitting layer 234 is disposed on the first electrode 232 and the bank 270 exposed by the bank 270.

Here, the organic light emitting layer 234 may be disposed on the first electrode 232 exposed by the bank 270, or may be disposed on the first electrode 232 and the bank 270. The second electrode 236 of the organic light emitting element 230 is disposed so as to overlap with the organic light emitting layer 234 and the bank 270.

The overcoat layer 260 may include a plurality of concave portions 262 and a plurality of convex portions 264 in the light emitting region EA in order to improve light extraction efficiency in the organic light emitting device 100. [ A structure composed of a plurality of concave portions 262 and a plurality of convex portions 264 is referred to as a microlens MLA.

In this case, of the light incident on the interface between the microlenses MLA and the first electrode 232 of the organic light emitting device 200, light incident at an incidence angle of less than the total reflection critical angle is extracted directly out of the substrate 210. Light incident at an incidence angle of more than a total reflection critical angle is incident on the microlens to change the optical path, and finally, the light is extracted out of the substrate 210. Therefore, the light extraction efficiency of the organic light emitting device 200 to which the microlens is applied can be improved.

3 is a plan view of an organic light emitting device to which a microlens is applied. 4 is a sectional view taken along line A-B of the organic light emitting device to which the microlens is applied.

Referring to FIGS. 3 and 4, the organic light emitting device 200 has a structure in which the overcoat layer 260 is formed on the basis of the thickness of the organic light emitting layer 234 of the organic light emitting diode 230, A first region 272 corresponding to the convex portion 264, a second region 274 positioned between the concave portion 262 and the convex portion 264 of the overcoat layer 260, And a third area 276 corresponding to the second area 262.

When the organic light emitting layer 234 is formed by a vapor deposition process having a straight line, the thickness of the organic light emitting layer 234 is set to a first region (a direction perpendicular to the inclined plane of the second region 274) in the second region 274 corresponding to the inclined plane 272 and the organic light-emitting layer 234 formed in the third region 276.

The organic light emitting element 230 is formed in the second region 274 to have a thickness smaller than that of the first region 272 and the third region 276, It mainly emits light with high density. In addition, since the incident angle of the light incident on the inclined surface of the microlens in the region corresponding to the second region 274 is mainly concentrated inside the total reflection critical angle, multiple reflections are possible and the light extraction efficiency is enhanced.

However, when the microlens is applied, the current density in the light emitting region is high, and thus the light emitting efficiency can be further increased if the second region 274 that emits light mainly increases. The distribution of the second regions 274 may coincide with the distribution of the microlens structures including the concave portions 262 and the convex portions 264 of the overcoat layer 260. In order to increase the distribution of the microlens structure, if the pitch of the microlens structure is relatively decreased, the distribution of the second region 274 also increases. As a result, the total area of the second region 274 increases, and the luminous efficiency can be improved.

Figs. 5 and 6 show the shapes on the plane of the concave and convex portions of the overcoat layer.

As shown in FIG. 5, the overcoat layer 260 may have a honeycomb shape in which a convex portion 264 of a specific shape, for example, a hexagonal shape, surrounds the concave portion 262 in a plan view.

A honeycomb overcoat layer 260 surrounding a concave portion 262 in a planar shape and surrounding a hexagonal convex portion 264 implements a microlens structure in the direction of the substrate 210 so that an image is displayed in the direction of the substrate 210 Type organic light emitting device.

5, a honeycomb overcoat layer 260 surrounding a hexagonal convex portion 264 around the concave portion 262 is formed on the substrate 210 by an overcoat layer 260 And then irradiating light to the honeycomb-shaped mask having the exposed portion corresponding to the concave portion 262, and then etching the light-irradiated region using an etching liquid. The material of the overcoat layer 260 may be a general positive photoresist, but is not limited thereto.

As shown in FIG. 6, the overcoat layer 260 may be a honeycomb shape having a specific shape, for example, a hexagonal concave portion 262 surrounding the convex portion 264.

The honeycomb overcoat layer 260 surrounding the convex portion 264 in a planar manner and surrounded by the hexagonal concave portion 262 implements the microlens structure in the direction opposite to the substrate 210, It can be applied to a column-type organic light emitting device for displaying an image.

6, a honeycomb overcoat layer 260 surrounding a hexagonal concave portion 262 around the convex portion 264 is formed on the substrate 210 by an overcoat layer 260 And then irradiating light to the honeycomb-shaped mask having the exposed portion corresponding to the convex portion 264, and then etching the light-unexposed region using an etching solution. The material of the overcoat layer 260 may thus generally be a negative photoresist, but is not limited thereto.

As described above, in order to relatively reduce the pitch of the microlens structure in order to increase the distribution of the microlens structure, one of the exposed portion unexposed to the mask and the non-exposed portion must be reduced.

Figures 7A and 7B illustrate the failure of the overcoat layer when the area of the exposed area of the mask is reduced in the process.

The optimal shape of the concave portion 262 or the convex portion 264 of the overcoat layer 260 can be ensured when the area of the exposed portion 282 of the mask 280 is relatively large as shown in Fig. . However, in order to relatively reduce the pitch (p1- > p2) of the microlens structure, when the area of the exposure portion 282 is relatively reduced in the mask 280 as shown in Fig. 7B, the actual exposure amount The material of the overcoat layer 260a is not hardened and the size and height of the concave portion 262 or the convex portion 264 of the overcoat layer 260 may be reduced to such an extent that the optimum shape can not be secured have.

FIGS. 8A and 8B show defects of the overcoat layer when they are reduced in the process to the area of the unexposed area of the mask.

8A, if the area of the unexposed portion 284 of the mask 280 is relatively large, the gap between the concave portions 262 of the overcoat layer 260 or the gap between the convex portions 264, that is, gap can be ensured. However, in order to relatively reduce the pitch (p3- > p4) of the microlens structure, as shown in Fig. 8B, the interval of the non-visible portion 284 in the mask 280, The concave portions 262 or the convex portions 264 may be flattened due to optical interference between the exposing portions 282, which may result in a problem that the final shape can not be secured.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. The organic light emitting device according to the present invention includes an overcoat layer in which two or more concave portions and two or more convex portions are linearly arranged instead of a honeycomb structure in which concave portions are surrounded by convex portions or vice versa. And to provide an organic light emitting device capable of further improving the light extraction efficiency in the light emitting region by minimizing the pitch between the concave portions or the convex portions.

9 is a plan view of an organic light emitting device according to an embodiment. 10 is a cross-sectional view taken along line E-F of Fig.

Referring to FIGS. 2 and 9, the organic light emitting device 300 according to an embodiment includes a substrate 310 divided into a light emitting region and a non-emitting region, a light emitting region 300 disposed on the substrate 310, An overcoat layer 360 including a concave portion 362 and two or more convex portions 364, a first electrode 332 disposed on the overcoat layer 360, an organic light emitting layer 350 disposed on the first electrode 332, And a second electrode 336 disposed on the first electrode 334 and the organic light emitting layer 334. The linearity includes any kind of linearity, such as a straight line or a line, or a combination thereof.

Two or more concave portions 362 and two or more convex portions 364 are linearly arranged in the overcoat layer 360 so that the pitch p between the concave portions 362 or between the convex portions 364 in the exposure process using the mask, Can be minimized.

The first electrode 332, the organic light emitting layer 334 and the second electrode 336 constitute an organic light emitting device 330 electrically connected to the thin film transistor 220 shown in FIG.

The interlayer insulating film 340 is disposed on the thin film transistor 220 composed of the active layer 222, the gate electrode 224, the source electrode 226 and the drain electrode 228 shown in FIG. A protective layer 350 is disposed on the interlayer insulating layer 340. An overcoat layer 360 is disposed on the substrate 310 including the protective layer 350.

A first electrode 332 of the organic light emitting diode 330 electrically connected to the thin film transistor 220 is disposed on the overcoat layer 360. A bank (270 in FIG. 2) for defining a pixel by exposing a part of the first electrode 332 is disposed on the overcoat layer 360. A bank is also referred to as a pixel definition layer. The first electrode 332 exposed by the bank and the organic light emitting layer 334 are disposed on the bank.

And the second electrode 336 of the organic light emitting element 330 is disposed so as to overlap with the organic light emitting layer 334.

In addition, although not shown, the organic light emitting device 300 to which the embodiments of the present invention may be applied may further include a color filter layer disposed on the protection layer 350 or the second electrode 336. However, the color filter layer may be disposed only in a part of sub-pixels among a plurality of sub-pixels constituting the organic light emitting device 300.

As shown in Figs. 9 and 11, the two or more concave portions 362 and the two or more convex portions 364 may be arranged in a zigzag shape, a linear shape as shown in Figs. 13 and 14, Or a combination thereof. When the two or more concave portions 362 and the two or more convex portions 364 are not linear, zigzag, or wired, the organic light emitting diode 320 emits light in various directions instead of emitting light in one direction. have.

When two or more concave portions 362 and two or more convex portions 364 are planar and zigzag as shown in Figs. 9 and 11, the angle between zigzag shapes may be 80 to 120 degrees, but is not limited thereto . As described above. When the two or more concave portions 362 and the two or more convex portions 364 are zigzag or wired, the viewing angle can be improved by emitting light in various directions. If the angle is less than 80 or more than 120 degrees, The improvement effect of the viewing angle may be relatively decreased. In other words, when the angle is between 80 degrees and 120 degrees therebetween, the improvement effect of the viewing angle can be maximized.

Two or more concave portions 362 and two or more convex portions 364 may be formed on the substrate 310 in a first direction or as shown in FIGS. 11 and 14, as shown in FIGS. 9 and 13, And may be linearly arranged in one of the second directions in different directions. The first direction and the second direction are respectively the transverse direction and the longitudinal direction and may be perpendicular to each other, but are not limited thereto. In other words, since the directions of the two or more concave portions 362 and the two or more convex portions 364 are not limited, the degree of freedom in designing the organic light emitting device 300 can be increased.

The pitch between two or more recesses 362 or between the two or more protrusions 364 may be less than or equal to a particular size, but is not limited thereto. The pitch p between the concave portions 362 or the convex portions 364 in the exposure process using the mask that linearly forms the concave portions 362 and the convex portions 364 in the overcoat layer 360 is set to be not more than a specific size Can be minimized.

The material of the overcoat layer 360 is not limited, but may be a positive photoresist or a negative photoresist.

If the material of the overcoat layer 360 is a positive photoresist, the pitch between the recesses 362 or between the projections 364 may be less than a certain size, but is not limited thereto. Also, if the material of the overcoat layer 360 is a negative photoresist, the pitch between the recesses 362 or between the protrusions may be less than or equal to a certain size, but is not limited thereto. In the case where the material of the overcoat layer 360 is a positive photoresist in the exposure process using the mask that linearly forms the concave portions 362 and the convex portions 364 in the overcoat layer 360 between the concave portions 362 or the convex portions 364, The pitch p between the first and second end portions 364 can be further minimized.

In the above-described embodiment, two or more concave portions 362 and two or more convex portions 364 are linearly arranged in the overcoat layer 360, but the present invention is not limited thereto. For example, the pitch between the concave portions or the convex portions is minimized by the concave portions and the convex portions having different shapes from the honeycomb structure in which the convex portions are surrounded by the convex portions or the concave portions are surrounded by the convex portions, and the light extraction efficiency is further improved in the light emitting region .

Hereinafter, another embodiment will be described in which, as another embodiment, a case in which two or more concave portions and two or more convex portions have different shapes in plan view, for example, multiple shapes, multiple multiple shapes with different centers, spiral shapes, The device will be described in detail.

15A to 15D are plan views of an organic light emitting device according to another embodiment. Figs. 16A to 16B show other examples of the shapes of the concave and convex portions of the overcoat layer of Figs. 15A to 15D. Figs. 17A to 17B show other examples of the shapes of the concave and convex portions of the overcoat layer of Figs. 15A to 15D.

10 and 15A to 17B, an organic light emitting device 400 according to another embodiment includes a substrate 310 divided into a light emitting region and a non-emitting region, A first electrode 332 disposed on the overcoat layer 360 and an organic light emitting layer (not shown) disposed on the first electrode 332. The overcoat layer 360 includes an overcoat layer 362 and two or more convex portions 364, 334 and a second electrode 336 disposed on the organic light emitting layer 334.

At this time, in the organic light emitting device 400, the overcoat layer 360 including the two or more concave portions 362 and the two or more convex portions 364 may have multiple shapes in plan view, multiple multiple shapes with different centers, Or a combination thereof.

15A to 15D, two or more concave portions 462 and two or more convex portions 464 may be multi-planar in shape.

The multiple features may be multiple, partially cut out shapes, e.g., multiple features with a cut out portion of the outer portion.

15A, two or more recesses 462 and protrusions 464 on two sides may be planar in multiple circular shapes and may be a multiple circular shape 466 with a portion of the outer, .

15B, two or more recesses 462 and protrusions 464 on two sides may be multi-oval in plan view and may be a multi-oval shape 466 in which a portion of the outer multi-oval shape is incised .

Referring to FIG. 15C, the two or more concave portions 462 and the convex portions 464 on the two sides may be in the form of a multiple rhombus in a plane, but may be in a multi-polygonal shape, for example, a multi-rectangular shape.

And may be a multi-rhombic shape 466 having a portion of the outer multi-elliptical shape cut out as shown in FIG. 15C.

15D, two or more recesses 462 and two protrusions 464 can be a concave multi-diamond shape 468 and a portion of the outer concave multi-diamond shape 468 can be a concave multi- Shape 466 as shown in FIG.

16A and 16B, two or more concave portions 462 and two or more convex portions 464 may be a plurality of multiple shapes having different centers in plan view.

The plurality of multiple shapes having different centers may be a plurality of multiple shapes that are partially cut out, for example, a plurality of multiple shapes in which a portion of the outer multiple shape portions are cut out.

16A, two or more concave portions 462 and two convex portions 464 may be formed in a plurality of multi-rectangular shapes having different centers in plan view.

Although FIG. 16A shows that a part of the outer multi-quadrangular shape of a plurality of multi-quadrangular shapes having different centers is not cut out, a part of the outer quadrangular shape may be an incised multi-quadrangle.

Referring to FIG. 16B, the two or more concave portions 462 and the two convex portions 464 may be formed in a plurality of multi-rhombic shapes having different planes from each other, and a plurality of outer rhombic shapes, 466).

17A to 17B illustrate a plurality of multiple rectangular shapes having different centers in the plane and a plurality of multiple rhombic shapes having different centers, but the present invention is not limited thereto. For example, a plurality of polygonal shapes having different centers, a plurality of multiple circular shapes having different centers, and a plurality of multiple oval shapes having different centers.

17A-17B, the two or more recesses 462 and the two protrusions 464 may be helically flat in shape.

The spiral shape may be a partially spiraled spiral shape, for example, a spiral shape in which a portion of the outer spiral shape is incised.

17A, two or more recesses 462 and protrusions 464 on two sides may be planar in a circular spiral shape, and a portion of the outer spiral shape may be an incised spiral shape 466. [

Referring to 17b, two or more recesses 462 and two protrusions 464 may be flat and square spiral. A portion of the outer helical shape may be an incised helical shape 466.

FIG. 17B shows that a portion of the outer square spiral shape is not cut, but a portion of the outer square spiral shape may be a cut-out multiple square.

17A and 17B illustrate that two or more concave portions 462 and two convex portions 464 have a circular spiral shape and a square spiral shape, but are not limited thereto. For example, a triangular spiral shape or a hexagonal spiral shape.

15A to 17B, two or more concave portions 462 or two or more convex portions 464 are formed by the concave portion 462 or the curved surface of the convex portion 464 so that the concave portions 362 The pitch p between the concave portions 462 or between the convex portions 464 in the exposure process using the mask can be minimized to a specific size or less as in the case of forming the convex portions 364 and the convex portions 364 linearly.

15A to 17B, the pitch p between two or more concave portions 462 or between two or more convex portions 464 may have the same size, and the organic light emitting element emits light in one direction But it is a dense shape that emits light in various directions, so that the light emitting efficiency and light extraction efficiency can be improved and the viewing angle can be improved.

As described above, since the organic light emitting devices 300 and 400 according to the embodiments are not honeycomb structures in which the convex portions are surrounded by the concave portions or conversely the convex portions are surrounded by the concave portions, the space between the concave portions 362 or between the convex portions 364 The pitch is minimized to increase the total area of the light emitting region that actually emits light, so that the light extraction efficiency can be further improved.

Further, since the organic light emitting device 300 according to the embodiments further improves the light extraction efficiency, it can improve the device luminance / efficiency / lifetime / power consumption as the light extraction performance is improved.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented.

Claims (12)

A substrate divided into a light emitting region and a non-emitting region;
An overcoat layer disposed on the substrate, the overcoat layer comprising at least two concave portions and at least two convex portions linearly in a plane;
A first electrode disposed on the overcoat layer;
An organic light emitting layer disposed on the first electrode; And
And a second electrode disposed on the organic light emitting layer.
The method according to claim 1,
Wherein the two or more concave portions and the two or more convex portions are one of a zigzag shape, a straight shape, and a wired shape in a plane or a combination thereof.
3. The method of claim 2,
Wherein an angle between the zigzag shapes when the two or more concave portions and the two or more convex portions are zigzag in a plane is 80 degrees to 120 degrees.
The method according to claim 1,
Wherein the two or more concave portions and the two or more convex portions are linearly arranged in one of a first direction on the substrate or a second direction different from the first direction.
The method according to claim 1,
Wherein the material of the overcoat layer is a positive photoresist or a negative photoresist.
A substrate divided into a light emitting region and a non-emitting region;
An overcoat layer disposed on the substrate, the overcoat layer comprising at least two concave portions and at least two convex portions that are multiple in shape in plan view, multiple multiple shapes with different centers, one or a combination of helical shapes, or combinations thereof;
A first electrode disposed on the overcoat layer;
An organic light emitting layer disposed on the first electrode; And
And a second electrode disposed on the organic light emitting layer.
The method according to claim 6,
Wherein the multiple shape, the plurality of multiple shapes having different centers, and the helical shape are partially cut shapes.
The method according to claim 6,
Wherein the multiple shape is one of a multiple circular shape, a multi-elliptical shape, a multi-polygonal shape, or a combination thereof.
9. The method of claim 8,
Wherein the multi-polygonal shape is one of a multi-rectangular shape, a multi-rhombic shape, or a combination thereof.
The method according to claim 6,
Wherein the plurality of multiple shapes having different centers are one of a plurality of multi-circular shapes having different centers, a plurality of multi-elliptical shapes having different centers, and a plurality of multi-polygonal shapes having different centers or a combination thereof.
11. The method of claim 10,
Wherein the plurality of multipole polygonal shapes having different centers are one of a plurality of multiple rectangular shapes having different centers and a plurality of multiple rhombic shapes having different centers or a combination thereof.
The method according to claim 6,
Wherein a pitch between the at least two concave portions or between the at least two convex portions is the same.

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