KR20210026452A - Light emitting display apparatus - Google Patents

Abstract

According to one embodiment of the present invention, a light emitting display device comprises: a substrate on which a plurality of sub-pixels are disposed, and including a first region and a second region; an overcoating layer disposed on the substrate; a plurality of first electrodes disposed on the plurality of sub-pixels on the overcoating layer; a bank layer disposed on partial regions of the plurality of first electrodes on the overcoating layer and defining light emitting regions and non-emission regions of the plurality of sub-pixels; a light emitting layer disposed to cover the first electrode and the bank layer; and a second electrode disposed on the light emitting layer. The overcoating layer may include a base unit disposed in the first region and the second region and a plurality of protrusion units protruding from the base unit in the second region. According to the present invention, the decrease in luminance according to a viewing angle of the light emitting display device can be improved by disposing the protrusion units in a curved region or a bending region.

Description

Light emitting display device {LIGHT EMITTING DISPLAY APPARATUS}

The present invention relates to a light-emitting display device, and more particularly, to a light-emitting display device with improved luminance and viewing angle.

As the current information age enters, the field of display devices that visually display electrical information signals is rapidly developing, and research is continuing to develop performances such as thinner, lighter, and low power consumption for various display devices.

Among these various display devices, a light-emitting display device is a self-illuminating display device, and unlike a liquid crystal display device, since a separate light source is not required, it can be manufactured in a lightweight and thin form. In addition, the light emitting display device is not only advantageous in terms of power consumption by low voltage driving, but also has excellent color realization, response speed, viewing angle, and contrast ratio (CR), so it is expected to be used in various fields. Has become.

In the case of a top emission type light emitting display device, a material having a transmissive property is used as a cathode in order to emit light emitted from the emission layer upward. Even if the cathode has a transmissive property, some of the light emitted from the light emitting layer is reflected from the cathode having the transmissive property and is directed toward the anode, and is reflected again at the anode, thereby generating light that is repeatedly reflected between the anode and the cathode. In this case, a microcavity may be implemented in which luminance of light of a specific wavelength among light emitted from the emission layer is improved through constructive interference based on a distance between layers through which light emitted from the emission layer is repeatedly reflected.

The inventors of the present invention have recognized that when a micro-cavity is implemented in a light-emitting display device, the luminance in the front direction of the light-emitting display device is increased, so that light extraction efficiency from the front side is improved. However, the inventors of the present invention recognized that when implementing a micro-cavity, as opposed to improving the front luminance, the luminance at the side decreases and the color coordinate changes. That is, when implementing the micro-cavity, it was confirmed that luminance and color shift occurred according to the viewing angle.

When the inventors of the present invention implement an edge bending light emitting display device with an edge bending, the pixels disposed in the bending area of the light emitting display device are disposed to face the side according to the bending angle, and bend. It was recognized that the luminance and viewing angle in the region were lowered. For example, even if the user looks at the light emitting display device from the front direction, the same phenomenon occurs with respect to the pixels arranged in the bending area as when looking at the pixels in an oblique direction instead of the front direction. Accordingly, when a user views the edge-bending light emitting display device in which the micro-cavity is implemented from the front, a difference in luminance and color coordinates occurs between the flat portion and the curved portion. For example, as the bending angle increases toward the outer periphery of the light emitting display device, luminance and viewing angle may be severely deteriorated.

Accordingly, the inventors of the present invention invented a new structure of a light emitting display device capable of improving light extraction efficiency in a bending area of a light emitting display device and reducing uniformity according to luminance and viewing angle.

An object to be solved by the present invention is to provide a light emitting display device capable of improving luminance reduction according to a viewing angle in a curved area or a bending area by arranging a pattern for correcting inclination of a pixel in a curved area or a bending area.

In addition, another problem to be solved by the present invention is to provide a light emitting display device capable of improving power consumption by improving light extraction efficiency and front efficiency in a curved area or a bending area.

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

In the light emitting display device according to an exemplary embodiment of the present invention, a plurality of sub-pixels are disposed, and a substrate including a first region and a second region, an over-coating layer disposed on the substrate, and a plurality of sub-pixels disposed on the over-coating layer. A light emitting layer disposed on a plurality of first electrodes and an overcoat layer in a partial area of the plurality of first electrodes and disposed to cover the bank layer defining the light emitting area and the non-emitting area of the plurality of sub-pixels, the first electrode, and the bank layer , And a second electrode disposed on the emission layer, and the overcoat layer may include a base portion disposed in the first region and the second region, and a plurality of protrusions protruding from the base portion in the second region.

A light emitting display device according to another exemplary embodiment of the present invention includes a substrate including a flat portion and a curved portion, an insulating layer disposed on the substrate, and a light emitting device disposed on the insulating layer, and including a first electrode, a light emitting layer, and a second electrode. , And a bank layer disposed in a partial region of the first electrode, and the insulating layer may include a plurality of viewing angle improvement patterns disposed at different positions from the bank layer in the curved portion.

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

According to the present invention, by disposing the protrusion in the curved area or the bent area, it is possible to improve the reduction in luminance according to the viewing angle of the light emitting display device.

According to the present invention, light extraction efficiency may be increased by changing a path of light emitted from a light emitting layer in a curved area or a bent area.

The present invention can improve light extraction efficiency and frontal efficiency, thereby implementing a light emitting display device with improved power consumption.

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

1 is a perspective view of a light emitting display device according to an exemplary embodiment of the present invention.
FIG. 2 is a cross-sectional view of a light emitting display according to II-II' of FIG. 1.
3A is a cross-sectional view of the light emitting display according to III-III' of FIG. 1 before bending.
3B is a cross-sectional view of the light emitting display according to III-III' of FIG. 1 after bending.
4A is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention before bending.
4B is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention after bending.
5 is an image for explaining light extraction efficiency in a light emitting display device according to a comparative example.
6 is an image illustrating light extraction efficiency in a light emitting display device according to an exemplary embodiment of the present invention.
7 is an image illustrating light extraction efficiency in a light emitting display device according to another exemplary embodiment of the present invention.
8A to 8C are images for explaining light extraction efficiency according to an inclination angle of a substrate, a height of a protrusion, and a third angle in the light emitting display device according to example embodiments.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, only these embodiments are intended to complete the disclosure of the present invention, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims.

The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present invention, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When'include','have','consists of' and the like mentioned in the present invention are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

When an element or layer is referred to as “on” another element or layer, it includes all cases in which another layer or another element is interposed directly on or in the middle of another element.

Also, the first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first constituent element mentioned below may be a second constituent element within the technical idea of the present invention.

The same reference numerals refer to the same elements throughout the specification.

The area and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not necessarily limited to the area and thickness of the illustrated component.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or can be implemented together in an association relationship. May be.

Hereinafter, the present invention will be described with reference to the drawings.

1 is a perspective view of a light emitting display device according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of a light emitting display according to II-II' of FIG. 1. 1 and 2, the light emitting display device 100 includes a substrate 110, a thin film transistor 120, an overcoat layer 130, a bank layer 140, a light emitting device 150, and an encapsulation unit 170. It may include. The light emitting display device 100 is implemented as a top emission type light emitting display device. In FIG. 1, only the substrate 110 is illustrated among various components of the light emitting display device 100 for convenience of description.

1 and 2, the substrate 110 may support and protect various components of the light emitting display device 100. The substrate 110 may be made of glass or a plastic material having flexibility. When the substrate 110 is made of a plastic material, for example, it may be made of polyimide (PI). However, it is not limited thereto. The substrate 110 includes a first area A1 and a second area A2. The first area A1 is a planar area, and the second area A2 is a curved area. The first area A1 may be a flat area, and the second area A2 may be a curved area. The first area A1 may be a flat portion, and the second area A2 may be a curved portion or a bent portion. In the first region A1, for example, the second region A2 is disposed on both sides of the first region A1, and the slope may increase as the distance from the first region A1 increases. However, the present invention is not limited thereto, and each of the second regions A2 disposed on both sides of the first region A1 may be disposed with a different curvature. Also, the second area A2 may be disposed on only one side of the first area A1 or may be disposed on all sides of the first area A1. For example, when the first area A1 has four sides, the second area A2 may be disposed on one or more of the four sides, or may be disposed on all sides of the four sides.

The substrate 110 includes a display area AA and a non-display area NA. The display area AA and the non-display area NA may be disposed in the first area A1 and the second area A2 of the substrate 110, respectively.

The display area AA is an area in which an image is displayed in the light emitting display device 100, and a display element and various driving elements for driving the display element may be disposed in the display area AA. For example, the display device may include a light emitting device 150 including a first electrode 151, a light emitting layer 152, and a second electrode 153. In addition, various driving elements such as a thin film transistor 120 for driving the display element, a capacitor, and a wiring may be disposed in the display area AA.

A plurality of sub-pixels SP may be included in the display area AA. The sub-pixel SP is a minimum unit constituting a screen, and each of the plurality of sub-pixels SP may include a light emitting element 150 and a driving circuit. In addition, each of the plurality of sub-pixels SP may emit light having a different wavelength. For example, the plurality of sub-pixels SP may include at least one red sub-pixel, a green sub-pixel, and a blue sub-pixel. This is not limited thereto, and the plurality of sub-pixels SP may further include a white sub-pixel.

The driving circuit of the sub-pixel SP is a circuit for controlling driving of the light emitting element 150. For example, the driving circuit may include the thin film transistor 120 and a capacitor, but is not limited thereto.

The non-display area NA is an area in which an image is not displayed, and various components for driving the plurality of sub-pixels SP disposed in the display area AA may be disposed. For example, a driving IC that supplies signals for driving the plurality of sub-pixels SP, a flexible film, and the like may be disposed.

The non-display area NA may be an area surrounding the display area AA as illustrated in FIG. 1. However, it is not limited thereto. For example, the non-display area NA may be an area extending from the display area AA.

The sub-pixel SP disposed in the first area A1 will be described with reference to FIG. 2. The buffer layer 111 is disposed on the substrate 110. The buffer layer 111 may improve adhesion between layers formed on the buffer layer 111 and the substrate 110, and may block an alkali component, etc., leaking out from the substrate 110. The buffer layer 111 may be formed of a single layer of silicon nitride (SiNx) or silicon oxide (SiOx), or a multiple layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto. The buffer layer 111 may be omitted based on the type and material of the substrate 110 and the structure and type of the thin film transistor 120.

The thin film transistor 120 is disposed on the substrate 110. The thin film transistor 120 may be used as a driving element of the light emitting display device 100. The thin film transistor 120 includes a gate electrode 121, an active layer 122, a source electrode 123, and a drain electrode 124. In the light emitting display device 100 according to an exemplary embodiment of the present invention, in the thin film transistor 120, an active layer 122 is disposed on a gate electrode 121, and a source electrode 123 and a source electrode 123 are disposed on the active layer 122. A structure in which the drain electrode 124 is disposed, and may be a thin film transistor 120 having a bottom gate structure in which the gate electrode 121 is disposed at the bottom. However, it is not limited thereto.

The gate electrode 121 of the thin film transistor 120 is disposed on the substrate 110. The gate electrode 121 is a variety of metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and Any one of copper (Cu), an alloy of two or more, or a multilayer thereof may be used, but the present invention is not limited thereto.

A gate insulating layer 112 is disposed on the gate electrode 121. The gate insulating layer 112 is a layer for electrically insulating the gate electrode 121 and the active layer 122 and may be made of an insulating material. For example, the gate insulating layer 112 may be composed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx), or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. It does not become.

The active layer 122 is disposed on the gate insulating layer 112. The active layer 122 is disposed to overlap the gate electrode 121. For example, the active layer 122 may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or an organic semiconductor. I can.

An etch stopper 113 is disposed on the active layer 122. When the source electrode 123 and the drain electrode 124 are patterned and formed by an etching method, the surface of the active layer 122 may be prevented from being damaged due to plasma by the etch stopper 113. One side of the etch stopper 113 may overlap the source electrode 123 and the other side may overlap the drain electrode 124. However, the etch stopper 113 may be omitted.

The source electrode 123 and the drain electrode 124 are disposed on the active layer 122 and the etch stopper 113. The source electrode 123 and the drain electrode 124 are disposed to be spaced apart on the same layer. The source electrode 123 and the drain electrode 124 may be electrically connected to the active layer 122 in a manner that contacts the active layer 122. The source electrode 123 and the drain electrode 124 are various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), Any one of neodymium (Nd) and copper (Cu), an alloy of two or more, or a multilayer thereof may be used, but the present invention is not limited thereto.

The overcoat layer 130 is disposed on the thin film transistor 120. The overcoat layer 130 may protect the thin film transistor 120 and smooth a step difference between layers disposed on the substrate 110. The overcoat layer 130 is an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene resin, a polyphenylene sulfide resin, a benzocyclobutene, and a photoresist. It may be formed of one of, but is not limited thereto.

The overcoat layer 130 includes a base portion 131. The base portion 131 is disposed on the thin film transistor 120 in the first region A1 and the second region A2 of the substrate 110. The upper surface of the base portion 131 has a surface substantially parallel to the substrate 110. Accordingly, the base portion 131 may protect the thin film transistor 120 and may flatten a level difference between layers disposed on the substrate 110.

Referring to FIG. 2, the light emitting device 150 is disposed on the overcoat layer 130. The light emitting device 150 includes a first electrode 151 disposed on the overcoat layer 130, a light emitting layer 152 disposed on the first electrode 151, and a second electrode disposed on the light emitting layer 152 ( 153).

The first electrode 151 is disposed on the overcoat layer 130 and disposed to cover a part of the upper surface of the base portion 131. The first electrode 151 may be electrically connected to the thin film transistor 120 on the base portion 131 of the overcoat layer 130.

The first electrode 151 may include a reflective layer and a transparent conductive layer disposed on the reflective layer. Since the light emitting display device 100 according to the exemplary embodiment of the present invention is a top emission type light emitting display device, the reflective layer may reflect light emitted from the light emitting element 150 upward. The reflective layer may be made of a metal material, and for example, may be made of a metal material such as aluminum (Al), silver (Ag), palladium (Pd), copper (Cu), and magnesium-silver alloy (Mg:Ag). . However, it is not limited thereto. The reflective layer may be electrically connected to the drain electrode 124 through a contact hole formed in the overcoat layer 130. The present invention is not limited thereto, and the reflective layer may be electrically connected to the source electrode 123 through a contact hole formed in the overcoat layer 130.

The transparent conductive layer of the first electrode 151 is disposed on the reflective layer and is electrically connected to the drain electrode 124 through the reflective layer. The transparent conductive layer 151b may be made of a conductive material having a high work function to supply holes to the light emitting layer 152. For example, the transparent conductive layer is Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Indium Tin Zinc Oxide (ITZO), Zinc Oxide (ZnO). ) And tin oxide (TO)-based transparent conductive oxide, but is not limited thereto.

Referring to FIG. 2, a bank layer 140 is disposed on the first electrode 151 and the overcoat layer 130. The bank layer 140 may be disposed so as to cover an end portion of the first electrode 151 of the light emitting device 150 and may include a light emitting area EA and a non-emissive area NEA. For example, the bank layer 140 may be disposed between the first electrode 151 and the emission layer 152 in the non-emissive area NEA to block light generation in the non-emissive area NEA. In addition, since the bank layer 140 is not disposed in the emission area EA, the emission layer 152 is directly positioned on the first electrode 151 to generate light from the emission layer 152.

The bank layer 140 may be formed of an organic material. For example, the bank layer 140 may be made of polyimide, acrylic, or benzocyclobutene-based resin, but is not limited thereto. In addition, the thickness of the bank layer 140 may be about 1.2 μm. It is not limited thereto.

The bank layer 140 may include an upper surface, a lower surface, and a side surface, and the upper surface thereof may be disposed smaller than the lower surface. The top surface of the bank layer 140 is a surface positioned at the top of the bank layer 140 and may be a surface substantially parallel to the base portion 131 of the overcoat layer 130 or the substrate 110. The lower surface of the bank layer 140 may be a surface in contact with the base portion 131 at the lowermost portion of the bank layer 140. The side surface of the bank layer 140 may be a surface connecting the top surface of the bank layer 140 and the base portion 131 of the overcoat layer 130. The side surface of the bank layer 140 may have a shape inclined toward the base portion 131 from the upper surface.

The emission layer 152 is disposed on the first electrode 151 and the bank layer 140. For example, the light-emitting layer 152 is disposed on the first electrode 151 in the light-emitting area EA, and is disposed on the bank layer 140 in the non-emissive area NEA.

The emission layer 152 is a layer for emitting light of a specific color, and may include at least one of a red emission layer, a green emission layer, a blue emission layer, and a white emission layer. In addition, the emission layer 152 may further include various layers such as a hole transport layer, a hole injection layer, a hole blocking layer, an electron injection layer, an electron blocking layer, an electron transport layer, and the like. The emission layer 152 may be an organic emission layer made of an organic material, but is not limited thereto. For example, the light emitting layer 152 may be a quantum dot light emitting layer or a micro LED.

As the emission layer 152 is disposed on the bank layer 140 in the non-emission area NEA, the emission layer 152 may also be disposed along the shape of the bank layer 140. Accordingly, the emission layer 152 has a flat top surface on the top surface of the first electrode 151 in the emission area EA and the bank layer 140 in the non-emission area NEA, and on the side of the bank layer 140 It can have an inclined top surface.

The second electrode 153 is disposed on the emission layer 152. The second electrode 153 supplies electrons to the emission layer 152. The second electrode 153 is indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), and zinc oxide (ZnO). And a tin oxide (TO)-based transparent conductive oxide or a ytterbium (Yb) alloy. In addition, the second electrode 153 may be made of a metal material such as silver (Ag), copper (Cu), magnesium-silver alloy (Mg:Ag), or a metal material having a very thin thickness. As the light emitting display device 100 is a top emission type light emitting display device, the second electrode 153 has a very thin thickness, so the refractive index of the second electrode 133 may not affect the progress of light. have.

As the second electrode 153 is disposed on the emission layer 152 in the non-emission area NEA, the second electrode 153 may also be disposed along the shape of the bank layer 140. Accordingly, the second electrode 153 has a flat top surface on the top surface of the first electrode 151 in the light-emitting area EA and the top surface of the bank layer 140 in the non-emission area NEA. It may have an inclined top surface on the side.

Referring to FIG. 2, an encapsulation part 170 is disposed on the light emitting device 150. The encapsulation part 170 may be disposed to cover the second electrode 153. The encapsulation unit 170 may protect the light emitting layer 150 from moisture or oxygen penetrating from the outside of the light emitting display device 100.

The encapsulation part 170 includes a first encapsulation layer 171, a second encapsulation layer 172, and a third encapsulation layer 173.

The first encapsulation layer 171 is disposed on the second electrode 153 to suppress penetration of moisture or oxygen. The first encapsulation layer 171 may be made of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), or aluminum oxide (AlyOz), but is not limited thereto.

As the first encapsulation layer 171 is disposed on the second electrode 153, the first encapsulation layer 171 may also be disposed along the shape of the second electrode 153. Accordingly, the first encapsulation layer 171 has a flat top surface on the top surface of the first electrode 151 in the light-emitting area EA and the top surface of the bank layer 140 in the non-emission area NEA, and the bank layer 140 It may have an inclined top surface on the side of.

The second encapsulation layer 172 is disposed on the first encapsulation layer 171 to planarize the surface. In addition, the second encapsulation layer 172 may cover foreign substances or particles that may occur during the manufacturing process. The second encapsulation layer 172 may be formed of an organic material such as silicon oxycarbon (SiOxCz), acrylic or epoxy resin, but is not limited thereto.

The third encapsulation layer 173 is disposed on the second encapsulation layer 172 and, like the first encapsulation layer 171, can suppress penetration of moisture or oxygen. The third encapsulation layer 173 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), silicon oxide (SiOx), or aluminum oxide (AlyOz), but is not limited thereto. The third encapsulation layer 173 may be made of the same material as the first encapsulation layer 171 or may be made of a different material.

Since the light emitting display device 100 according to the exemplary embodiment of the present invention is a top emission type light emitting display device, it may be manufactured to implement a micro-cavity. For example, in the light emitting display device 100 according to the exemplary embodiment, by setting a distance between the reflective layer of the first electrode 151 and the second electrode 153, the light emitted from the light emitting layer 152 is By implementing constructive interference against, it is possible to improve light efficiency.

Hereinafter, for a more detailed description of the sub-pixel SP disposed in the second area A2, refer to FIGS. 3A and 3B.

3A is a cross-sectional view of the light emitting display according to III-III' of FIG. 1 before bending. 3B is a cross-sectional view of the light emitting display according to III-III' of FIG. 1 after bending. Compared to the sub-pixel SP of the first region A1, the sub-pixel SP of the second region A2 differs only in the shape of the overcoat layer 130, the light emitting device 150, and the encapsulation part 170. Therefore, redundant description is omitted. Although the second area A2 after bending has a curved shape, since the size of one sub-pixel SP is very small, FIG. 3B shows that the substrate 110 after bending has a planar shape rather than a curved shape.

Referring to FIG. 3A, the overcoat layer 130 includes a plurality of protrusions 132 in the second area A2 of the substrate 110. The plurality of protrusions 132 may be formed to protrude from the base portion 131 in the light emitting area EA of the second area A2. In this case, the plurality of protrusions 132 and the base 131 may be integrally formed. For example, the base portion 131 and the protrusion portion 132 may be formed of the same material and may be simultaneously formed through the same process, for example, a mask process, but is not limited thereto. Since the color coordinate change according to the viewing angle in the second region A2 of the substrate 110 can be improved by the plurality of protrusions 132, a viewing angle improvement pattern may be used.

A plurality of protrusions 132 are disposed in one sub-pixel SP. For example, in the plurality of protrusions 132, as illustrated in FIGS. 3A and 3B, five protrusions 132 may be disposed in one sub-pixel SP. However, the present invention is not limited thereto, and the number of the plurality of protrusions 132 may be variously changed according to design.

The plurality of protrusions 132 may have a right triangle shape in cross section. For example, the cross section of the plurality of protrusions 132 is a first side (S1) and a first side (S1) and the base portion 131 disposed relatively close to the first area (A2) of the substrate 110 And the second side S2 disposed relatively close to the outer side of the substrate 110, and the first angle θ1 formed by the first side S1 and the second side S2 is a right angle. Can be In FIGS. 3A and 3B, it is shown that the point P where the first side S1 and the second side S2 of the plurality of protrusions 132 meet is formed in an angular shape, but the first side ( The shape of the point P where S1) and the second side S2 meet may be round.

The distance from the point P where the first side (S1) and the second side (S2) of the plurality of protrusions 132 meet to a point perpendicular to the upper surface of the base part 131, for example, a plurality of protrusions The height h of 132 may be about 0.75 μm to improve light extraction efficiency. However, the present invention is not limited thereto, and the height h of the plurality of protrusions 132 may be variously changed according to design.

The first electrode 151 is disposed on the plurality of protrusions 132. The first electrode 151 may be disposed on the plurality of protrusions 132 in the light emitting area EA of the second area A2 and may be disposed along the shape of the plurality of protrusions 132. Accordingly, the first electrode 151 may have a shape corresponding to the shape of the top surfaces of the plurality of protrusions 132 of the emission area EA, and may have a flat top surface on the base portion 131 of the non-emission area NEA. have.

The bank layer 140 is disposed on the first electrode 151. The bank layer 140 may be disposed to cover a part of the end of the first electrode 151 in the non-emission area NEA. Accordingly, the bank layer 140 may be disposed at different positions from the plurality of protrusions 132.

The emission layer 152 is disposed on the first electrode 151 and the bank layer 140. As the emission layer 152 is disposed on the first electrode 151 in the emission area EA of the second area A2, the emission layer 152 may also be disposed along the shape of the plurality of protrusions 132. Accordingly, the light-emitting layer 152 has a shape corresponding to the shape of the top surfaces of the plurality of protrusions 132 of the light-emitting area EA, and has a flat top surface on the top surface of the bank layer 140 of the non-light-emitting area NEA, The bank layer 140 may have an inclined top surface on the side surface.

The second electrode 153 is disposed on the emission layer 152. As the second electrode 153 is disposed on the emission layer 152 in the emission area EA of the second area A2, the second electrode 153 may also be disposed along the shape of the plurality of protrusions 132. have. Accordingly, the second electrode 153 has a shape corresponding to the shape of the top surfaces of the plurality of protrusions 132 of the light emitting area EA, and has a flat top surface on the top surface of the bank layer 140 of the non-emissive area NEA. And may have an inclined upper surface on the side surface of the bank layer 140.

A first encapsulation layer 171 is disposed on the second electrode 153. As the first encapsulation layer 171 is disposed on the second electrode 153 in the light emission area EA of the second area A2, the first encapsulation layer 171 also has a shape of the plurality of protrusions 132. Can be arranged accordingly. Accordingly, the first encapsulation layer 171 has a shape corresponding to the shape of the top surfaces of the plurality of protrusions 132 of the emission area EA, and a flat top surface on the top surface of the bank layer 140 of the non-emission area NEA. And may have an inclined top surface on the side of the bank layer 140.

Referring to FIG. 3B, the second angle θ2 formed by the first side S1 of the plurality of protrusions 132 and the base 131 is inclined at the substrate 110 on which the corresponding light emitting area EA is disposed. It can be the same as the angle. Accordingly, the second angle θ2 may be larger when the substrate 110 on which the corresponding light emitting area EA is disposed is bent at a larger inclination angle than when the substrate 110 is bent at a small inclination angle. For example, when the substrate 110 is bent as shown in FIG. 1, the second of the plurality of protrusions 132 disposed in the light emitting area EA disposed relatively adjacent to the first area A1 The angle θ2 may be smaller than the second angle θ2 of the plurality of protrusions 132 disposed in the light emitting area EA disposed relatively far from the first area A1. For example, when the second area A2 of the substrate 110 on which the light emitting area EA is disposed is inclined at an angle of about 15° from the virtual surface PS parallel to the first area A2, For example, when the inclination angle θ4 of the substrate 110 on which the plurality of protrusions 132 is located is about 15°, the first side S1 of the plurality of protrusions 132 and the base part 131 The second angle θ2 may also be about 15°, and the third angle θ3 formed by the second side S2 of the plurality of protrusions 132 and the base portion 131 may be about 75°. Accordingly, the first side S1 of the plurality of protrusions 132 is disposed in parallel with the virtual surface PS parallel to the first region A2 of the substrate 110, so that the plurality of protrusions 132 are formed in parallel. Light emitted from the light emitting layer 152 disposed on the first side S1 may be emitted toward the front of the light emitting display device 100.

When a micro-cavity is implemented in a conventional edge-bending light-emitting display device, the light-emitting elements disposed in the bending area of the substrate are inclined together, and the amount of light emitted from the light-emitting element to the front of the light-emitting display device decreases. A difference in luminance may occur between the bending area and the planar area. In addition, the optical distance between the first electrode and the second electrode in the bending area in the front direction and the optical distance between the first electrode and the second electrode in the planar area in the front direction are different, so that the bending area and the flat area A severe change in the color coordinates of the liver may occur.

Accordingly, in the light emitting display device 100 according to an exemplary embodiment, a plurality of protrusions 132 having a right-angled triangle shape are disposed in the light emitting area EA of the second area A2 of the substrate 110 to emit light. A decrease in luminance according to the viewing angle in the second area A2 of the display device 100 may be improved. For example, the second angle θ2 formed by the first side S1 of the plurality of protrusions 132 and the base part 131 may be the same as the inclination angle θ4 of the substrate 110. For example, the second angle θ2 formed by the first side S1 of the plurality of protrusions 132 and the base part 131 is the same as the inclination angle θ4 of the substrate 110 corresponding to the protrusions 132 can do. Accordingly, when the substrate 110 is bent, the first side S1 of the plurality of protrusions 132 is disposed in parallel with the virtual surface PS parallel to the first region A2 of the substrate 110. , The first side S1 of the plurality of protrusions 132 may face the front side of the light emitting display device 100. Accordingly, light emitted from the light emitting layer 152 disposed on the first side S1 of the plurality of protrusions 132 may be emitted toward the front of the light emitting display device 100. In addition, some of the light emitted from the light emitting layer 152 disposed on the second side S2 of the plurality of protrusions 132 is a first electrode disposed on the first side S1 of the plurality of protrusions 132 It is reflected by 151 and can proceed in the front direction. Accordingly, in the light emitting display device 100 according to the exemplary embodiment, the plurality of protrusions 132 are formed so that the second angle θ2 of the plurality of protrusions 132 is the same as the inclination angle θ4 of the substrate 110. By arranging, it is possible to improve the front luminance and viewing angle in the second region A2 of the light emitting display device 100, and solve the problem of luminance unevenness and color coordinate fluctuation between the first region A1 and the second region A2. I can. In addition, light emitted from the light emitting layer 152 may be additionally extracted in the front direction of the light emitting display device 100, thereby improving light extraction efficiency of the light emitting display device 100.

4A is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention before bending. 4B is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention after bending. The light emitting display device 400 of FIGS. 4A and 4B differs from the light emitting display device 400 of FIGS. 1 to 3B in the overcoat layer 430, the light emitting element 450, and the encapsulation part 470, Since other configurations are substantially the same, redundant descriptions may be omitted or simplified.

Referring to FIG. 4A, the plurality of protrusions 432 of the overcoat layer 430 may have an obtuse triangle shape in cross section. For example, the cross section of the plurality of protrusions 432 is composed of a first side (S1) and a second side (S2), and a first angle (θ1) formed by the first side (S1) and the second side (S2) ) Can be an obtuse angle. In FIGS. 4A and 4B, it is shown that the point P where the first side S1 and the second side S2 of the plurality of protrusions 432 meet is formed in an angular shape, but the first side ( The shape formed by the point P where S1) and the second side S2 meet may be a round shape.

The distance from the point P where the first side (S1) and the second side (S2) of the plurality of protrusions 432 meet to a point perpendicular to the upper surface of the base part 131, for example, a plurality of protrusions The height h of 432 may be about 0.75 μm to improve light extraction efficiency. However, the present invention is not limited thereto, and the height h of the plurality of protrusions 432 may be variously changed according to design.

The first electrode 451 is disposed on the plurality of protrusions 432. The first electrode 451 may be disposed on the plurality of protrusions 432 in the light emitting area EA of the second area A2 and may be disposed along the shape of the plurality of protrusions 432. Accordingly, the first electrode 451 may have a shape corresponding to the shape of the top surfaces of the plurality of protrusions 432 of the light-emitting area EA, and may have a flat top surface on the base portion 131 of the non-emissive area NEA. have.

The bank layer 140 is disposed on the first electrode 451. The bank layer 140 may be disposed to cover a part of the end of the first electrode 451 in the non-emission area NEA. Accordingly, the bank layer 140 may be disposed at different positions from the plurality of protrusions 432.

The emission layer 452 is disposed on the first electrode 451 and the bank layer 140. As the emission layer 452 is disposed on the first electrode 451 in the emission area EA of the second area A2, the emission layer 452 may also be disposed along the shape of the plurality of protrusions 432. Accordingly, the light emitting layer 452 has a shape corresponding to the shape of the top surfaces of the plurality of protrusions 432 of the light emitting area EA, and has a flat top surface on the top surface of the bank layer 140 of the non-emissive area NEA, The bank layer 140 may have an inclined top surface on the side surface.

The second electrode 453 is disposed on the emission layer 452. As the second electrode 453 is disposed on the emission layer 452 in the emission area EA of the second area A2, the second electrode 453 may also be disposed along the shape of the plurality of protrusions 432. have. Accordingly, the second electrode 453 has a shape corresponding to the shape of the top surfaces of the plurality of protrusions 432 of the light emitting area EA, and has a flat top surface on the top surface of the bank layer 140 of the non-emissive area NEA. And may have an inclined upper surface on the side surface of the bank layer 140.

A first encapsulation layer 471 is disposed on the second electrode 453. As the first encapsulation layer 471 is disposed on the second electrode 453 in the light emission area EA of the second area A2, the first encapsulation layer 471 also has a shape of the plurality of protrusions 432. Can be arranged accordingly. Accordingly, the first encapsulation layer 471 has a shape corresponding to the shape of the top surfaces of the plurality of protrusions 432 of the light-emitting area EA, and a flat top surface on the top surface of the bank layer 140 of the non-emissive area NEA. And may have an inclined top surface on the side of the bank layer 140.

Referring to FIG. 4B, the second angle θ2 formed by the first side S1 of the plurality of protrusions 432 and the base portion 131 is inclined at the substrate 110 on which the corresponding light emitting area EA is disposed. It can be the same as the angle. Accordingly, the second angle θ2 may be larger when the substrate 110 on which the corresponding light emitting area EA is disposed is bent at a larger inclination angle than when the substrate 110 is bent at a small inclination angle. For example, when the substrate 110 is bent as shown in FIG. 1, the second of the plurality of protrusions 432 disposed in the light emitting area EA disposed relatively adjacent to the first area A1 The angle θ2 may be smaller than the second angle θ2 of the plurality of protrusions 132 disposed in the light emitting area EA disposed relatively far from the first area A1. For example, when the second area A2 of the substrate 110 on which the light emitting area EA is disposed is inclined at an angle of about 15° from the virtual surface PS parallel to the first area A2, For example, when the inclination angle θ4 of the substrate 110 on which the plurality of protrusions 432 is located is about 15°, the first side S1 of the plurality of protrusions 432 and the base part 131 2 The angle θ2 may also be about 15°. Accordingly, the first side S1 of the plurality of protrusions 432 is disposed in parallel with the virtual surface PS parallel to the first region A2 of the substrate 110, so that the plurality of protrusions 432 are formed in parallel. Light emitted from the light emitting layer 152 disposed on the first side S1 may be emitted toward the front of the light emitting display device 100.

Referring to FIG. 4B, the third angle θ3 formed by the second side S2 of the plurality of protrusions 432 and the base part 131 may be smaller than a difference between 90° and the second angle θ2. As described above, since the second angle θ2 increases as the inclination angle θ4 of the substrate 110 increases, the third angle θ3 may decrease. For example, when the second area A2 of the substrate 110 on which the light emitting area EA is disposed is inclined at an angle of about 15° from the virtual surface PS parallel to the first area A2, The second angle θ2 formed by the first side S1 and the base portion 131 of the plurality of protrusions 432 may also be about 15°, and the second side S2 and the base of the plurality of protrusions 432 The third angle θ3 formed by the portion 131 may be about 75°. Accordingly, some of the light emitted from the light emitting layer 452 disposed on the first side S1 of the plurality of protrusions 432 is changed by the second side S2 of the adjacent protrusion 432 , May be extracted in the front direction of the light emitting display device 400.

In the light-emitting display device 400 according to another exemplary embodiment of the present invention, a plurality of protrusions 432 having an obtuse triangle shape are disposed in the light-emitting area EA of the second area A2 of the substrate 110, It is possible to improve the reduction in luminance according to the viewing angle in the second area A2 of 400. For example, the second angle θ2 formed by the first side S1 of the plurality of protrusions 432 and the base portion 131 may be the same as the inclination angle θ4 of the substrate 110. Accordingly, light emitted from the light emitting layer 452 disposed on the first side S1 of the plurality of protrusions 432 may be emitted toward the front of the light emitting display device 400. Accordingly, in the light emitting display device 400 according to another exemplary embodiment of the present invention, the front luminance and the viewing angle in the second area A2 of the light emitting display device 400 can be improved, and the first area A1 and the first area It is possible to solve the problem of luminance non-uniformity and color viewing angle variation between the two areas A2.

In addition, in the light-emitting display device 400 according to another exemplary embodiment of the present invention, the plurality of protrusions 432 are arranged in an obtuse triangle shape to improve light extraction efficiency of the light-emitting display device 400. For example, the third angle θ3 formed by the second side S2 of the plurality of protrusions 432 and the base portion 131 may be smaller than a difference between 90° and the second angle θ2. Accordingly, while the second area A2 of the light emitting display device 400 is bent, the second side S2 of the plurality of protrusions 432 may be disposed in an inclined shape. Accordingly, some of the light emitted from the light emitting layer 452 disposed on the second side S2 of the plurality of protrusions 432 may be extracted in the front direction. In addition, some of the light emitted from the light emitting layer 452 disposed on the first side S1 of the protrusion 432 adjacent to the plurality of protrusions 432 is the second side S2 of the plurality of protrusions 432 The light path is changed by being reflected by the first electrode 451 disposed thereon, so that it may be extracted in the front direction of the light emitting display device 400. Accordingly, in the light emitting display device 400 according to another exemplary embodiment of the present invention, a plurality of protrusions 432 having an obtuse triangle shape are disposed to additionally transmit light emitted from the light emitting layer 452 in the front direction of the light emitting display device 400. By allowing the light to be extracted, light extraction efficiency of the light emitting display device 400 may be improved.

5 is an image for explaining light extraction efficiency in a light emitting display device according to a comparative example. 6 is an image illustrating light extraction efficiency in a light emitting display device according to an exemplary embodiment of the present invention. 5 and 6 are images simulating light extraction efficiency in the light emitting display devices 10 and 100 according to a comparative example and an embodiment of the present invention using a finite difference time domain (FDTD) method. to be. The light emitting display devices 10 and 100 of FIGS. 5 and 6 are all bent. The light emitting display devices 10 and 100 of FIGS. 5 and 6 are formed of the same material and have the same thickness, and the second of the substrate 110 is assumed to have an inclination angle θ4 of about 15°. This is an image showing that the area A2 is bent. In addition, it is assumed that the height h of the plurality of protrusions 132 in the light emitting display device 100 of FIG. 6 is about 0.75 μm. In addition, light extracted from the light emitting display devices 10 and 100 of FIGS. 5 and 6 is shown in white. For convenience of description of FIG. 6, reference may be made to FIGS. 3A and 3B.

First, referring to FIG. 5, in the light-emitting display device 10 according to the comparative example, the light-emitting element 50 is disposed on the overcoat layer 30, and the encapsulation part 70 is disposed on the light-emitting element 50. . When the substrate is bent, the top surface of the overcoat layer 30 is flat. Accordingly, some of the light emitted from the light emitting layer 52 may be extracted to the front of the light emitting display device 10, but in the light emitting area EA, a plurality of light emitting display devices 100 according to an embodiment of the present invention may be The configuration corresponding to the protrusion 132 is not disposed. Accordingly, in the light emitting display device 10 according to the comparative example, there is no structure for reflecting the light emitted toward the side of the light emitting display device 10 among the light emitted from the light emitting area EA.

Referring to FIG. 6, in the light emitting display device 100 according to an exemplary embodiment of the present invention, a plurality of protrusions 132 are disposed on the base part 131 of the overcoat layer 130, and the plurality of protrusions 132 The first angle (θ1) formed by the first side (S1) and the second side (S2) of is a right angle, and the second angle formed by the first side (S1) and the base part 131 of the plurality of protrusions 132 (θ2) is disposed so as to be the same as the inclination angle (θ4) of the substrate 110. Accordingly, the light emitting layer 152 disposed on the first side S1 of the plurality of protrusions 132 is disposed so that the first side S1 of the plurality of protrusions 132 faces the top of the light emitting display device 100. It can be seen that the ratio of light directed to the front of the light emitting display device 100 is high among the light emitted from ). Accordingly, the plurality of protrusions 132 are arranged so that the second angle θ2 formed by the first side S1 of the plurality of protrusions 132 and the base part 131 is the same as the inclination angle θ4 of the substrate 110 Accordingly, it can be seen that among the light emitted from the light emitting layer 152 disposed on the first side S1 of the plurality of protrusions 132, the amount of light directed toward the front of the light emitting display device 100 is increased.

[Table 1] is a table comparing the amount of improvement in light extraction efficiency in the light emitting display device 100 according to the exemplary embodiment of the present invention of FIG. 6 compared to the light emitting display device 10 according to the comparative example of FIG. 5 to be. [Table 1] is calculated based on the light extraction efficiency of 1 in the light emitting display device 10 according to the comparative example of FIG. 5 using a finite difference time domain (FDTD) simulation. It is one result.

Referring to Table 1 below, it can be seen that in the light emitting display device 100 according to an embodiment of the present invention, the light extraction efficiency is increased by about 12.00% compared to the light emitting display device 10 according to the comparative example of FIG. 5. I can.

Comparative example Light-emitting display device 100 Rate of increase Light extraction efficiency 1.00 1.12 12.00%

7 is an image for explaining light extraction efficiency in the light emitting display device 400 according to another exemplary embodiment of the present invention. 7 is an image simulating light extraction efficiency in the light emitting display device 400 according to another exemplary embodiment of the present invention using a finite difference time domain (FDTD) method. The light emitting display device 400 of FIG. 7 assumes that the inclination angle θ4 and the second angle θ2 of the substrate 110 are about 15°, and the third angle θ3 is about 45°, and the substrate 110 This is an image showing that the second area A2 of) is bent. In addition, it is assumed that the height h of the plurality of protrusions 432 in the light emitting display device 400 of FIG. 7 is about 0.75 μm. In addition, light extracted from the light emitting display device 400 of FIG. 7 is shown in white. For convenience of description of FIG. 7, reference may be made to FIGS. 4A and 4B. Referring to FIG. 7, in the light emitting display device 400 according to another exemplary embodiment of the present invention, the base portion of the overcoat layer 430 ( A plurality of protrusions 432 are disposed on the 131, and a first angle θ1 formed by the first side S1 and the second side S2 of the plurality of protrusions 432 is an obtuse angle, and the plurality of protrusions ( The second angle θ2 formed by the first side S1 of the 432 and the base portion 131 is disposed to be the same as the inclination angle θ4 of the substrate 110. The second side S2 of the plurality of protrusions 432 is disposed in an inclined shape toward the first side S1 of the adjacent protrusions 432. Some of the light emitted from the light emitting layer 452 disposed on the first side S1 of the protrusion 432 adjacent to the plurality of protrusions 432 is directed to the second side S2 of the plurality of protrusions 432. , The optical path can be changed. Therefore, as the plurality of protrusions 432 are arranged in an obtuse triangle shape, among the light emitted from the light emitting layer 452 disposed on the first side S1 of the protrusion 432 adjacent to the plurality of protrusions 432 Part of the light path is changed by the second side S2 of the plurality of protrusions 432, so that the amount of light directed to the front direction of the light emitting display device 400 increases, and thus, the outside of the light emitting display device 400 It can be seen that the amount of light extracted by is increased.

[Table 2] is for comparing the amount of improvement in light extraction efficiency in the light-emitting display device 400 according to another embodiment of the present invention of FIG. 7 compared to the light-emitting display device 10 according to the comparative example of FIG. 5. It is a table. [Table 2] is calculated based on the light extraction efficiency of 1 in the light emitting display device 10 according to the comparative example of FIG. 5 using a finite difference time domain (FDTD) simulation. It is one result.

Referring to Table 2 below, it can be seen that in the light emitting display device 400 according to another embodiment of the present invention, the light extraction efficiency is increased by about 39.00% compared to the light emitting display device 10 according to the comparative example of FIG. 5. I can.

Comparative example Light-emitting display device 400 Rate of increase Light extraction efficiency 1.00 1.39 39.00%

8A to 8C are images for explaining light extraction efficiency according to an inclination angle of a substrate, a height of a protrusion, and a third angle in the light emitting display device according to example embodiments. 8A shows the height h and the third angle θ3 of the protrusion 432 in the light emitting display device 400 according to another exemplary embodiment of the present invention when the inclination angle θ4 of the substrate 110 is about 10°. This image is for explaining the light extraction efficiency according to ). FIG. 8B shows the height h and the lengths of the protrusions 132 and 432 in the light emitting display devices 100 and 400 according to the embodiments of the present invention when the inclination angle θ4 of the substrate 110 is about 15°. This image is for explaining the light extraction efficiency according to the 3 angle (θ3). 8C illustrates a height h and a third angle θ3 of the protrusion 432 in the light emitting display device 400 according to another exemplary embodiment of the present invention when the inclination angle θ4 of the substrate 110 is about 20°. This image is for explaining the light extraction efficiency according to ). In FIGS. 8A to 8C, the X-axis is the height h of the protrusion 432, and the Y-axis is the third angle θ3 formed by the second side S2 of the protrusion 432 and the base 131. In FIGS. 8A to 8C, the color is the light extraction efficiency, and the closer to red, the more the amount of light extracted by the protrusion 432 increases. In FIGS. 8A and 8C, the third angle θ3 was measured in a range of about 30° to 60°, and in FIG. 8B, the third angle θ3 was measured in a range of about 30° to 75°. For convenience of description of FIGS. 8A to 8C, reference may be made to FIGS. 3A to 4B. Referring to FIGS. 8A to 8C, a substrate It can be seen that as the inclination angle θ4 of 110 increases, the angle of the third angle θ3 representing the maximum light extraction amount of the light emitting display device 400 increases. In addition, it can be seen that as the inclination angle θ4 of the substrate 110 increases, the amount of light extracted by the plurality of protrusions 132 and 432 increases.

Referring to FIG. 8A, when the inclination angle θ4 of the substrate 110 is about 10°, it can be seen that the light extraction efficiency increases as the size of the third angle θ3 decreases. In particular, in a region where the height h of the plurality of protrusions 432 is close to about 0.5 μm and the third angle θ3 is about 30° to 35°, it can be seen that the light extraction efficiency is maximized.

Referring to FIG. 8B, in the light emitting display device 100 according to the exemplary embodiment of the present invention, when the inclination angle θ4 of the substrate 110 is about 15°, the height h of the plurality of protrusions 132 is It can be seen that the light extraction efficiency increases in a region close to about 0.75 μm and the third angle θ3 is about 75°.

In addition, in the light emitting display device 400 according to another embodiment of the present invention, when the inclination angle θ4 of the substrate 110 is about 15°, the size of the third angle θ3 is 30° to 60°, and the protrusion It can be seen that the light extraction efficiency increases in a region where the height h of 432 is about 0.5 μm to 0.9 μm. In particular, in a region where the height h of the plurality of protrusions 432 is close to about 0.6 μm and the third angle θ3 is about 35° to 50°, it can be seen that the light extraction efficiency is maximized.

Referring to FIG. 8C, when the inclination angle θ4 of the substrate 110 is about 20°, in a region where the height h of the protrusion 432 is less than about 0.5 μm, the height h of the protrusion 432 is low. It can be seen that as the size of the third angle θ3 increases, the light extraction efficiency increases. In addition, in the region where the height h of the protrusion 432 is about 0.6 μm or more, it is confirmed that the height h of the protrusion 432 increases and the light extraction efficiency increases as the size of the third angle θ3 increases. I can. In particular, in the region where the height h of the plurality of protrusions 432 is about 0.25 μm or less and the third angle θ3 is about 45° to 60°, it can be seen that the light extraction efficiency is increased to the maximum.

A light emitting display device according to various embodiments of the present invention may be described as follows.

In the light emitting display device according to an exemplary embodiment of the present invention, a plurality of sub-pixels are disposed, and a substrate including a first region and a second region, an over-coating layer disposed on the substrate, and a plurality of sub-pixels disposed on the over-coating layer. A light emitting layer disposed on a plurality of first electrodes and an overcoat layer in a partial area of the plurality of first electrodes and disposed to cover the bank layer including the light emitting area and the non-emitting area of the plurality of sub-pixels, the first electrode, and the bank layer , And a second electrode disposed on the emission layer, and the overcoat layer may include a base portion disposed in the first region and the second region, and a plurality of protrusions protruding from the base portion in the second region.

According to another feature of the present invention, the first region may be a planar region, and the second region may be a curved region.

According to another feature of the present invention, a plurality of protrusions may be disposed in the light emitting area.

According to another feature of the present invention, a plurality of protrusions may be disposed in one sub-pixel.

According to another feature of the present invention, an angle between one side of the protrusion and the base may be the same as the inclination angle of the substrate corresponding to the protrusion.

According to another feature of the present invention, the cross section of the protrusion may have a right triangle shape.

According to another feature of the present invention, the cross section of the protrusion may have an obtuse triangle shape.

According to another feature of the present invention, the cross section of the protrusion includes a first side disposed adjacent to the first region and a second side connecting the first side and the base, and the angle formed by the second side and the base portion is 90 It may be less than or equal to the difference between ° and the angle formed by the first side and the base portion.

A light emitting display device according to another exemplary embodiment of the present invention includes a substrate including a flat portion and a curved portion, an insulating layer disposed on the substrate, and a light emitting device disposed on the insulating layer, and including a first electrode, a light emitting layer, and a second electrode. , And a bank layer disposed in a partial region of the first electrode, and the insulating layer may include a plurality of viewing angle improvement patterns disposed at different positions from the bank layer in the curved portion.

According to another feature of the present invention, the bank layer may be disposed in the non-emission area, and a plurality of viewing angle improvement patterns may be disposed in the light emitting area in the curved portion.

According to another feature of the present invention, the light emitting display device further includes a plurality of sub-pixels disposed on a substrate, and a plurality of viewing angle improvement patterns may be disposed in a plurality of each of the plurality of sub-pixels.

According to still another feature of the present invention, a cross section of the plurality of viewing angle improvement patterns may have a triangular shape.

According to another feature of the present invention, one side of the plurality of viewing angle improvement patterns may be disposed in parallel with a parallel plane of the planar portion.

According to another feature of the present invention, the light emitting display device is a top emission type light emitting display device, and the light emitting device may be implemented as a micro-cavity.

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

100, 400: light-emitting display device
110: substrate
111: buffer layer
112: gate insulating layer
113: etch stopper
120: thin film transistor
121: gate electrode
122: active layer
123: source electrode
124: drain electrode
130, 430: overcoat layer
131: base portion
132, 432: protrusions
140: bank layer
150, 450: light-emitting element
151, 451: first electrode
152, 452: light emitting layer
153, 453: second electrode
170, 470: bag
171, 471: first encapsulation layer
172: second encapsulation layer
173: third encapsulation layer
AA: display area
NA: Non-display area
SP: sub pixel
A1: first area
A2: second area
EA: light-emitting area
NEA: light emitting area
S1: first side
S2: second side
θ1: first angle
θ2: second angle
θ3: third angle
θ4: inclination angle of the substrate
P: the point where the first and second sides meet
PS: a virtual plane in which the second area is parallel to the first area
h: height of the protrusion

Claims (14)

A substrate on which a plurality of sub-pixels are disposed and including a first region and a second region;
An overcoat layer disposed on the substrate;
A plurality of first electrodes disposed on the plurality of sub-pixels on the overcoat layer;
A bank layer disposed on the overcoat layer in some regions of the plurality of first electrodes and including an emission region and a non-emission region of the plurality of sub-pixels;
A light emitting layer disposed to cover the first electrode and the bank layer; And
Including a second electrode disposed on the emission layer,
The overcoat layer,
A base portion disposed in the first area and the second area; And
A light emitting display device comprising a plurality of protrusions protruding from the base in the second region. The method of claim 1,
The first region is a planar region,
The second area is a curved area. The method of claim 2,
The plurality of protrusions are disposed in the light emitting area. The method of claim 2,
A light emitting display device, wherein a plurality of the plurality of protrusions are disposed in one sub-pixel. The method of claim 1,
An angle formed by one side of the protrusion and the base part is the same as an inclination angle of the substrate corresponding to the protrusion. The method of claim 1,
The cross-section of the protrusion has a right triangle shape. The method of claim 1,
The cross-section of the protrusion has an obtuse triangle shape. The method of claim 7,
The cross section of the protrusion includes a first side disposed adjacent to the first region and a second side connecting the first side and the base part,
An angle formed by the second side and the base portion is equal to or less than 90° and a difference between an angle between the first side and the base portion. A substrate including a flat portion and a curved portion;
An insulating layer disposed on the substrate;
A light emitting device disposed on the insulating layer and including a first electrode, a light emitting layer, and a second electrode; And
A bank layer disposed in a partial region of the first electrode,
The insulating layer includes a plurality of viewing angle improvement patterns disposed at different positions from the bank layer on the curved portion. The method of claim 9,
The bank layer is disposed in the non-emission area,
The plurality of viewing angle improvement patterns are disposed in a light emitting area in the curved portion. The method of claim 9,
Further comprising a plurality of sub-pixels disposed on the substrate,
The plurality of viewing angle improvement patterns are disposed in plurality in each of the plurality of sub-pixels. The method of claim 11,
The plurality of viewing angle improvement patterns have a triangular cross-section. The method of claim 12,
One side of the plurality of viewing angle improvement patterns is disposed in parallel with a parallel surface of the planar portion. The method of claim 9,
The light emitting display device is a top emission type light emitting display device,
The light emitting device is a light emitting display device implemented as a micro-cavity.

Images