KR20200127762A - Light emitting display apparatus - Google Patents

Abstract

According to one embodiment of the present invention, a light emitting display device comprises: a substrate; an insulating layer disposed on the substrate and having a base unit and a protrusion unit; a first electrode disposed to cover sides of the base unit and the protrusion unit; a bank layer covering a part of the insulating layer and the first electrode; and a light emitting layer and second electrode disposed on the first electrode and the bank layer. The sides of the protrusion unit have a plurality of faces configured with different inclination angles.

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 in which light extraction efficiency is improved and power consumption can be improved.

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 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), and is expected to be used in various fields. have.

Light emitted from the light emitting layer of the light emitting display device passes through various components of the light emitting display device and exits the light emitting display device. However, among the light emitted from the light emitting layer, there are lights that cannot come out of the light emitting display device and are trapped inside the light emitting display device, so that light extraction efficiency of the light emitting display device becomes a problem.

For example, there is a problem in that light is trapped inside the light emitting display device due to total reflection loss, optical waveguide loss, and surface plasmon loss among the light emitted from the emission layer. Here, the total reflection loss refers to a decrease in light extraction efficiency due to light trapped inside the light emitting display device due to total reflection at the interface between the substrate and air among the light emitted from the emission layer. Optical waveguide loss refers to a decrease in light extraction efficiency due to light trapped therein due to total reflection at the interface of components inside the light emitting display. The loss of surface plasmon refers to a phenomenon in which light is absorbed from the metal surface during the incident and propagation of light, causing the light to vibrate free electrons on the metal surface, so that the light cannot be reflected or transmitted, thereby reducing the light extraction efficiency. .

The inventors of the present invention invented a light emitting display device having a new structure in order to improve light extraction efficiency of a light emitting display device by improving total reflection loss and optical waveguide loss. For example, the inventors of the present invention formed an overcoat layer to have a base portion having a flat upper surface and a protruding portion protruding from the base portion, and disposed an anode having a reflective layer on the sides of the base portion and the protruding portion. Accordingly, the reflective layer of the anode formed on the side of the protrusion can function as a side mirror, and some of the light trapped inside the light emitting display device by total reflection is extracted toward the front of the light emitting display device. The light extraction efficiency of the device has been improved.

However, the inventors of the present invention have recognized the problem that even when the above-described light emitting display device is used, light that is lost due to optical waveguide loss still exists.

For example, some of the light emitted from the emission layer may be totally reflected between the anode disposed under the emission layer and the cathode disposed on the emission layer and may be trapped. The organic material constituting the light emitting layer has a refractive index of about 1.8. In addition, when the cathode is made of a metallic material, the refractive index is very low. For example, when the cathode is made of silver (Ag), the refractive index of the cathode has a very low value of about 0.13. Accordingly, even if the cathode is formed very thin in order to implement a light emitting display device in a top emission method, light incident at an incidence angle greater than or equal to the critical angle among the light emitted from the emission layer and incident on the cathode may be reflected back to the emission layer. . In this way, the light reflected by the light emitting layer is reflected back from the reflective layer of the anode and is incident on the cathode, and may be repeatedly totally reflected between the anode and the cathode to be trapped.

In order to implement a light emitting display device in a top emission method, the cathode may be formed of a transparent conductive oxide such as indium tin oxide (ITO). In this case, since the transparent conductive oxide has a refractive index of about 1.8 to about 1.9, total reflection may not be achieved at the interface between the light emitting layer and the cathode. However, since the inorganic layer or the organic layer of the encapsulation portion disposed on the cathode may have a refractive index lower than that of the light emitting layer and the material constituting the cathode, light incident on the encapsulation portion may be reflected back to the anode side and trapped.

Accordingly, the inventors of the present invention invented a light emitting display device having a new structure capable of improving light extraction efficiency for light lost due to optical waveguide loss.

An object of the present invention is to provide a light emitting display device capable of improving light extraction efficiency by using an anode having a side mirror shape.

In addition, another problem to be solved by the present invention is to provide a light emitting display device capable of minimizing light loss due to optical waveguide loss that may occur despite using a side mirror-shaped anode.

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.

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.

A light emitting display device according to an embodiment of the present invention includes a substrate, an insulating layer disposed on the substrate and having a base portion and a protrusion, a first electrode, an insulating layer, and a first electrode disposed to cover side portions of the base and the protrusion And a bank layer covering a part of the first electrode, and a light emitting layer and a second electrode disposed on the bank layer, and side portions of the protrusions have a plurality of surfaces configured with different inclination angles. Accordingly, light extraction efficiency of the light emitting display device can be improved.

A light-emitting display device according to another exemplary embodiment of the present invention includes a substrate, an insulating layer including a base portion and a protrusion on the substrate, and a light emitting device disposed in contact with the insulating layer, and including a first electrode, a light emitting layer, and a second electrode. And, the side portion of the protrusion on which the light emitting device is disposed includes a plurality of surfaces to improve light extraction efficiency for light emitted from the light emitting device. Accordingly, power consumption of the light emitting display device can be improved.

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

In the present invention, the light extraction efficiency of the light emitting display device may be improved by using the anode having a side mirror shape.

The present invention can increase light extraction efficiency by reducing light lost due to loss of optical waveguide among light emitted from the light emitting layer.

The present invention can improve light extraction efficiency and implement 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 schematic plan 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
3 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention.
4 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention.
5 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention.
6 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention.
7 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention.
8A and 8B are simulation results according to a comparative example and an embodiment of the present invention.

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 forms, only the present embodiments make the disclosure of the present invention complete, 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, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies 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 other element is interposed directly on or in the middle of another element.

In addition, 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. Therefore, the first component mentioned below may be a second component within the technical idea of the present invention.

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

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not limited to the size 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 can be implemented independently of each other or can be implemented together in a related relationship. May be.

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

1 is a schematic plan 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 may include a substrate 110, a thin film transistor 120, a light emitting element 130, an overcoat layer 140, and a bank layer 114. The light emitting display device 100 may be implemented as a top emission type light emitting display device.

1 and 2, the substrate 110 is a substrate for supporting and protecting 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 display area A/A and a non-display area N/A.

The display area A/A is an area in which an image is displayed on the display device 100, and a display element and various driving elements for driving the display element may be disposed in the display area A/A. For example, the display device may include a light emitting device 130 including a first electrode 131, a light emitting layer 132, and a second electrode 133. 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 A/A.

A plurality of sub-pixels SP may be included in the display area A/A. 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 130 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 a 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 130. For example, the driving circuit may include the thin film transistor 120 and a capacitor, but is not limited thereto.

The non-display area N/A 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 A/A may be disposed. For example, a driving IC, a flexible film, etc. that supply signals for driving the plurality of sub-pixels SP may be disposed.

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

Referring to FIG. 2, a buffer layer 111 is disposed on a 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 is not an essential component and may be omitted based on the type and material of the substrate 110 and the structure and type of the thin film transistor 120.

A 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, the active layer 122 is disposed on the gate electrode 121, and the source electrode 123 and the source electrode 123 are disposed on the active layer 122. A structure in which the drain electrode 124 is disposed, and the thin film transistor 120 having a bottom gate structure in which the gate electrode 121 is disposed at the bottom, 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 may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or an organic semiconductor.

An etch stopper 117 is disposed on the active layer 122. When the etch stopper 117 is formed by patterning the source electrode 123 and the drain electrode 124 by an etching method, the surface of the active layer 122 may be a layer formed to prevent damage due to plasma. One end of the etch stopper 117 may overlap the source electrode 123 and the other end may overlap the drain electrode 124. However, the etch stopper 117 may be omitted.

The source electrode 123 and the drain electrode 124 are disposed on the active layer 122 and the etch stopper 117. 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.

An overcoat layer 140 is disposed on the thin film transistor 120. The overcoat layer 140 is an insulating layer for protecting the thin film transistor 120 and smoothing a step difference between layers disposed on the substrate 110. The overcoat layer 140 is an acrylic resin, epoxy resin, phenol resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, benzocyclobutene and photoresist. It may be formed as one, but is not limited thereto.

The overcoat layer 140 includes a base portion 141 and a protrusion portion 142. The base portion 141 and the protrusion portion 142 may be integrally formed as shown in FIG. 2. For example, the base portion 141 and the protrusion portion 142 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.

The base portion 141 is disposed on the thin film transistor 120. The upper surface of the base portion 141 has a surface parallel to the substrate 110. Accordingly, the base portion 141 may flatten a step that may occur due to a component disposed below.

A protrusion 142 is disposed on the base portion 141. The protrusion 142 is formed integrally with the base part 141 and has a shape protruding from the base part 141. Accordingly, the upper surface of the protrusion 141 may be disposed smaller than the lower surface. However, it is not limited thereto.

The protrusion 142 has an upper surface and a plurality of side surfaces S1, S2, S3. The upper surface of the protrusion 142 is a surface positioned at the top of the protrusion 142 and may be a surface substantially parallel to the base 141 or the substrate 110. The plurality of side surfaces S1, S2, S3 may be a surface connecting the upper surface of the protrusion 142 and the base part 141.

The plurality of side surfaces (S1, S2, S3) of the protrusion 142 include a first surface S1 extending from the base part 141, a second surface S2 extending from the upper surface of the protrusion 142, and a first It may include a third surface (S3) between the surface (S1) and the second surface (S2). For example, the first surface (S1) extends from the base portion 141, the third surface (S3) extends from the first surface (S1), and the second surface (S2) is the third surface (S3) It extends from and may connect the third surface S3 and the upper surface. The third surface S3 is disposed different from the inclination angle of the first surface S1 and the second surface S2. In FIG. 2, the protrusion 142 is shown to have three side surfaces S1, S2, and S3, but the number of side surfaces is not limited thereto. For example, an additional surface may be included to connect the first surface S1 and the second surface S2. In addition, the plurality of side surfaces S1, S2, S3 may be connected to each other at different inclination angles.

The first surface S1 may have a positive inclination angle based on the base part 141. Here, the fact that the first surface S1 has a positive inclination angle with respect to the base part 141 means that the first surface S1 is located on the upper part 141 of the base part, as shown in FIG. The surface S1 may be inclined to the upper surface of the base portion 141. In addition, the third surface S3 may be parallel to the base portion 141. Accordingly, the third surface S3 may be parallel to the upper surfaces of the substrate 110 and the protrusion 142. In addition, the second surface S2 may have a positive inclination angle with respect to the base portion 141. The inclination angle of the first surface S1 and the inclination angle of the second surface S2 may be the same or different.

In FIG. 2, it has been described that one third surface S3 is disposed between the first surface S1 and the second surface S2, but is not limited thereto, and the first surface S1 and the second surface S2 ), an additional surface may be arranged. In this case, at least one of the plurality of side surfaces S1, S2, and S3 may be parallel to the base portion 141.

In FIG. 2, it has been described that the over-coating layer 140 includes a base portion 141 having a flat top surface and a protrusion 142 protruding from the base portion 141, but the over-coating layer 140 and the base portion 141 If it has a shape implemented by the protrusion 142, the detailed configuration of the overcoat layer 140 is not limited to the base portion 141 and the protrusion 142, and may be variously defined.

Referring to FIG. 2, the light emitting device 130 is disposed on the overcoat layer 140. The light emitting device 130 includes a first electrode 131 disposed on the overcoat layer 140, a light emitting layer 132 disposed on the first electrode 131, and a second electrode 133 disposed on the light emitting layer 132. ).

The first electrode 131 is disposed on the overcoat layer 140 and disposed to cover the side portions of the base portion 141 and the protrusion portion 142. For example, the first electrode 131 is disposed on a portion of the upper surface of the base portion 141 where the protrusion 142 is not disposed, the side surface of the protrusion 142, and the upper surface, and the base portion 141 and the protrusion It is arranged along the shape of 142. However, the present invention is not limited thereto, and the first electrode 131 may be disposed only on the top surface of the base part 141 on which the protrusion part 142 is not disposed and a side surface of the protrusion part 142.

The first electrode 131 includes a reflective layer 131A electrically connected to the thin film transistor 140 and a transparent conductive layer 131B disposed on the reflective layer 131A.

The reflective layer 131A of the first electrode 131 is disposed on the overcoat layer 140. Since the light emitting display device 100 according to an exemplary embodiment of the present invention is a top emission type light emitting display device, the reflective layer 131A performs a function of reflecting light emitted from the light emitting element 130 upward. The light generated by the light emitting layer 132 of the light emitting device 130 may not emit light only upward, but may also emit light from the side. The light emitted from the side is directed to the inside of the light emitting display device 100, and may be trapped inside the light emitting display device 100 due to total reflection, and may further be extinguished while traveling in a direction inside the light emitting display device 100. Accordingly, the reflective layer 131A is disposed under the emission layer 132 and is disposed to cover the side of the protrusion 142, so that the direction of light traveling toward the side of the emission layer 132 may be changed to the front direction.

The reflective layer 131A may be made of a metal material, and may be made of a metal material such as aluminum (Al), silver (Ag), copper (Cu), magnesium-silver alloy (Mg:Ag), etc. It is not limited. The reflective layer 131A may be electrically connected to the drain electrode 124 through a contact hole formed in the overcoat layer 140. However, the present invention is not limited thereto, and the reflective layer 131A may be electrically connected to the source electrode 123 through a contact hole formed in the overcoat layer 140.

The transparent conductive layer 131B is disposed on the reflective layer 131A. The transparent conductive layer 131B is disposed on the reflective layer 131A, and is electrically connected to the drain electrode 124 through the reflective layer 131A. The transparent conductive layer 131B may be made of a conductive material having a high work function to supply holes to the light emitting layer 132. For example, the transparent conductive layer 131B is Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Indium Tin Zinc Oxide (ITZO), and Zinc Oxide (ITZO). Oxide, ZnO) and tin oxide (Tin Oxide, TO)-based transparent conductive oxide may be formed, but is not limited thereto.

Referring to FIG. 2, a bank layer 114 is disposed on the first electrode 131 and the overcoat layer 140. The bank layer 114 covers a part of the first electrode 131 of the light emitting device 130 and may include a first region A1 that is an emission region and a second region A2 that is a non-emission region. For example, the bank layer 114 in the second area A2 may be disposed between the first electrode 131 and the emission layer 132 to block light generation in the second area A2. Since the bank layer 114 is not disposed in the first region A1, the light emitting layer 132 is directly positioned on the first electrode 131 to generate light from the light emitting layer 132.

The bank layer 114 may be made of an organic material or an inorganic material. For example, the bank layer 114 may be made of an organic material such as polyimide, acrylic, or benzocyclobutene resin, or may be made of an inorganic material such as silicon nitride (SiNx) or silicon oxide (SiOx), but is limited thereto. It is not. 2 shows that the bank layer 114 is formed of an inorganic material and the bank layer 114 is formed along the shape of the first electrode 131 located under the bank layer 114, but the bank layer 114 is necessarily made of an inorganic material. It does not happen.

The emission layer 132 is disposed on the first electrode 131. For example, the emission layer 132 may be disposed on the first electrode 131 according to the shape of the first electrode 131. The emission layer 132 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 132 may further include various layers such as a hole transport layer, a hole injection layer, an electron injection layer and an electron transport layer. The refractive index of the emission layer 132 may vary depending on the type of organic material constituting the emission layer 132, but the organic material that can be used as the emission layer 132 may have a refractive index of about 1.8 on average. The emission layer 132 may be an organic emission layer made of an organic material, but is not limited thereto. For example, the light emitting layer 132 may be formed of a quantum dot light emitting layer or a micro LED.

The second electrode 133 is disposed on the emission layer 132. For example, the second electrode 133 may be disposed on the emission layer 132 according to the shape of the emission layer 132. The second electrode 133 supplies electrons to the light emitting layer 132. The second electrode 133 may be made of a metal material such as silver (Ag), copper (Cu), and magnesium-silver alloy (Mg:Ag), but is not limited thereto. When the second electrode 133 is made of a metal material, it has a very low refractive index. For example, when silver (Ag) is used as the second electrode 133, the refractive index of the second electrode 133 is about 0.13 It can be about.

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 an embodiment of the present invention, by setting a distance between the reflective layer 131A and the second electrode 133, constructive interference with light emitted from the light emitting layer 132 is prevented. By implementing, light efficiency can be improved.

In previous light emitting display devices, among the light emitted from the light emitting layer, light trapped and lost inside the light emitting display device has become a factor of lowering light efficiency. For example, among the light emitted from the light emitting layer, light that cannot be extracted to the outside of the light emitting display device due to total reflection loss or optical waveguide loss is generated, and thus light extraction efficiency of the light emitting display device is degraded. For example, in the previous light emitting display device, since the first electrode formed on the overcoat layer having a flat top surface is used, the light emitted from the light emitting layer at a low emission angle is emitted due to total reflection loss or optical waveguide loss. Could get stuck in the display device.

Accordingly, the light emitting display device 100 according to the exemplary embodiment may improve light extraction efficiency of the light emitting device 130 by using the overcoat layer 140 having the protrusion 142. For example, in the light emitting display device 100 according to an embodiment of the present invention, the overcoat layer 140 includes a base portion 141 and a protrusion 142 protruding from the base portion 141, and the light emitting device ( The reflective layer 131A of the first electrode 131 of 130 is disposed to cover the base portion 141 and at least the side surfaces of the protrusion portion 142. Accordingly, among the light emitted from the light emitting layer 132 of the light emitting display device 100, light emitted at a low emission angle may be extracted in the front direction by the reflective layer 131A disposed on the side of the protrusion 142. For example, referring to FIG. 2, when a first electrode is disposed on a flat overcoat layer like a conventional light-emitting display device, light directed to the side, for example, light emitted at a low emission angle May not proceed in the front direction and may not be extracted outside the light emitting display device due to total reflection loss or optical waveguide loss. However, in the light-emitting display device 100 according to an embodiment of the present invention, light emitted from the light-emitting layer 132 at a low emission angle is reflected from the reflective layer 131A disposed on the side of the protrusion 142 and is extracted in the front direction. Can be. Accordingly, in the light emitting display device 100 according to the exemplary embodiment, the reflective layer 131A disposed on the side of the overcoat layer 140 functions like a side mirror and may be lost in the light emitting display device 100. Since the existing light can be extracted in the front direction, the light extraction efficiency can be improved and power consumption can be improved.

In addition, in the light emitting display device 100 according to the exemplary embodiment, the protrusion 142 of the overcoat layer 140 includes a plurality of surfaces having different inclination angles, so that light extraction efficiency may be further improved. . For example, some of the light emitted from the light emitting layer 132 may be totally reflected between the first electrode 131 disposed under the light emitting layer 132 and the second electrode 133 disposed above the light emitting layer 132 and may be trapped. have. The organic material constituting the emission layer 132 has a refractive index of about 1.8. In addition, when the second electrode 133 is formed of a metallic material, the refractive index is very low. For example, when the second electrode 133 is formed of silver (Ag), the refractive index of the second electrode 133 is about 0.13 It has a very low value. Accordingly, even if the second electrode 133 is formed very thin to implement the light emitting display device 100 in the top emission method, the incident angle of the light emitted from the light emitting layer 132 and incident on the second electrode 133 is equal to or greater than the critical angle. Light incident to the light may be reflected back to the emission layer 132. As such, the light reflected by the light emitting layer 132 is reflected back from the reflective layer 131A of the first electrode 131 and enters the second electrode 133, and between the reflective layer 131A and the second electrode 133 It can be trapped due to repeated total reflection.

Accordingly, in the light emitting display device 100 according to an exemplary embodiment, the side surface of the protrusion 142 is the first surface S1 extending from the base part 141 and the second surface S1 extending from the upper surface of the protrusion 142. It includes a surface S2, and a third surface S3 between the first surface S1 and the second surface S2. In this case, the first surface S1 may have a positive inclination angle with respect to the base part 141, the third surface S3 may be parallel to the base part 141, and the second surface S2 is It may have a positive inclination angle based on the base part 141. The first surface S1, the second surface S2, and the third surface S3 may be arranged in a zigzag shape, and accordingly, the side portion of the overcoat layer 140 may have multiple steps. Accordingly, the light guided by total reflection between the reflective layer 131A and the second electrode 133 is extracted in the front direction by changing the traveling direction on the side of the protruding portion 142. For example, referring to FIG. 2, light guided by total reflection between the reflective layer 131A and the second electrode 133 is a first point near the boundary between the base portion 141 and the first surface S1 (P1), the fourth point (P4) near the boundary between the first surface (S1) and the third surface (S3), and the third point (P3) near the boundary between the third surface (S3) and the second surface (S2) ) And the second point P2 near the boundary between the upper surface of the protrusion 142 and the second surface S2, which does not correspond to the total reflection condition, and may be extracted in the front direction. Accordingly, in the light-emitting display device 100 according to an exemplary embodiment of the present invention, since light that may be lost in the light-emitting display device 100 can be extracted in the front direction, light extraction efficiency can be improved and power consumption. This can be improved.

3 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention. The light emitting display device 300 of FIG. 3 differs from the light emitting display device 100 of FIGS. 1 and 2 in the overcoat layer 340, the bank layer 314, and the light emitting element 330, and other configurations are substantially Since it is the same, duplicate description will be omitted.

Referring to FIG. 3, the overcoat layer 340 includes a base portion 141 and a protrusion portion 342. The protrusion 342 is formed integrally with the base part 141 and has a shape protruding from the base part 141. Accordingly, the upper surface of the protrusion 342 may be disposed smaller than the lower surface. However, it is not limited thereto.

The protrusion 342 has an upper surface and a plurality of side surfaces S1, S2, S3. The upper surface of the protrusion 342 is a surface positioned at the top of the protrusion 342 and may be a surface substantially parallel to the base portion 141 or the substrate 110. The plurality of side surfaces S1, S2, and S3 may be a surface connecting the upper surface of the protrusion 342 and the base part 141.

The plurality of side surfaces (S1, S2, S3) of the protrusion 342 are a first surface S1 extending from the base part 141, a second surface S2 extending from the upper surface of the protrusion 342, and a first It may include a third surface (S3) between the surface (S1) and the second surface (S2). For example, the first surface (S1) extends from the base portion 141, the third surface (S3) extends from the first surface (S1), and the second surface (S2) is the third surface (S3) It extends from and may connect the third surface S3 and the upper surface. The third surface S3 is disposed different from the inclination angle of the first surface S1 and the second surface S2. In FIG. 3, the protrusion 142 is illustrated as having three side surfaces S1, S2, and S3, but the number of side surfaces is not limited thereto. For example, an additional surface may be included to connect the first surface S1 and the second surface S2. In addition, the plurality of side surfaces S1, S2, S3 may be connected to each other at different inclination angles.

The first and third surfaces S1 and S3 may have opposite signs of inclination with respect to the upper surface of the base portion 141. For example, as shown in FIG. 3, when the first surface S1 has a negative slope, for example, when it has a shape that is inclined toward the lower right, the third surface S3 is a positive slope It may have a shape that is inclined to the lower left. Accordingly, the first surface S1 and the third surface S3 may have a pointed shape upward.

In addition, the third surface S3 and the second surface S2 may have opposite signs of inclination with respect to the top surface of the base portion 141. For example, as shown in FIG. 3, when the third surface S3 has a positive inclination, for example, when it has a shape inclined toward the lower left, the second surface S2 has a negative inclination May have, and may have a shape inclined toward the lower right. Accordingly, the third surface S3 and the second surface S2 may have a sharp shape downward.

In FIG. 3, it has been described that one third surface S3 is disposed between the first surface S1 and the second surface S2, but is not limited thereto, and the first surface S1 and the second surface S2 ), an additional surface may be arranged. For example, a plurality of surfaces disposed between the first surface S1 and the second surface S2 may also be configured such that signs of inclinations of the surfaces adjacent to each other are opposite to each other. Accordingly, the side portion of the protrusion 342 may have a zigzag shape, for example, may have a sawtooth shape, but is not limited thereto.

Referring to FIG. 3, a light emitting device 330 and a bank layer 314 are disposed on the overcoat layer 340. The light emitting device 330 includes a first electrode 331 disposed on the overcoat layer 340, a light emitting layer 332 disposed on the first electrode 331, and a second electrode 333 disposed on the light emitting layer 332. ). Therefore, all of the reflective layer 331A, the transparent conductive layer 331B, the bank layer 314, the light emitting layer 332, and the second electrode 333 disposed on the over-coating layer 340 are along the top surface of the over-coating layer 340. Can be formed.

The light emitting display device 300 according to another exemplary embodiment of the present invention may improve light extraction efficiency of the light emitting device 330 by using the overcoat layer 340 having the protruding portion 342. For example, among the light emitted from the light emitting layer 332 of the light emitting display device 300, light emitted at a low emission angle may be extracted in the front direction by the reflective layer 331A disposed on the side of the protrusion 342 . Therefore, in the light emitting display device 300 according to another embodiment of the present invention, the reflective layer 331A disposed on the side of the overcoat layer 340 functions like a side mirror and may be lost in the light emitting display device 300. Existing light can be extracted in the front direction, thereby improving light extraction efficiency and improving power consumption.

In addition, in the light emitting display device 300 according to another exemplary embodiment of the present invention, a side surface of the protrusion 342 is a first surface S1 extending from the base part 141 and a second surface S1 extending from the upper surface of the protrusion 342. It includes a surface S2, and a third surface S3 between the first surface S1 and the second surface S2. The first and third surfaces S1 and S3 may have opposite signs of inclination, and the third and third surfaces S3 and S1 may have opposite signs of inclination. Accordingly, the first surface (S1), the second surface (S2), and the third surface (S3) may be arranged in a zigzag shape, and accordingly, the side portion of the overcoat layer 340 may have multiple steps. have. Therefore, the light guided by total reflection between the reflective layer 331A and the second electrode 333 is near the boundary between the base portion 141 and the first surface S1, the first surface S1 and the third surface S3. ), in the vicinity of the boundary between the third surface (S3) and the second surface (S2), and in the vicinity of the boundary between the upper surface of the second surface (S2) and the protrusion (342). Can be. Accordingly, since light that may be lost in the light emitting display device 300 can be extracted in the front direction, light extraction efficiency can be improved and power consumption can be improved.

4 is a cross-sectional view of a luminescent labeling device according to another exemplary embodiment of the present invention. The light emitting display device 400 of FIG. 4 differs from the light emitting display device 100 of FIGS. 1 and 2 in the overcoat layer 440, the bank layer 414, and the light emitting element 430, and other configurations are substantially Since it is the same, duplicate description will be omitted.

Referring to FIG. 4, the overcoat layer 440 includes a base portion 141 and a protrusion portion 442. The protrusion 442 is formed integrally with the base portion 141 and has a shape protruding from the base portion 141. Accordingly, the upper surface of the protrusion 442 may be disposed smaller than the lower surface. However, it is not limited thereto.

The protrusion 442 has an upper surface and a plurality of side surfaces S1, S2, S3. The upper surface of the protrusion 442 is a surface positioned at the top of the protrusion 442, and may be a surface substantially parallel to the base portion 141 or the substrate 110. The plurality of side surfaces S1, S2, and S3 may be surfaces connecting the upper surface of the protrusion 442 and the base part 141.

The plurality of side surfaces (S1, S2, S3) of the protrusion 442 include a first surface S1 extending from the base part 141, a second surface S2 extending from the upper surface of the protrusion 442, and a first It may include a third surface (S3) between the surface (S1) and the second surface (S2). For example, the first surface (S1) extends from the base portion 141, the third surface (S3) extends from the first surface (S1), and the second surface (S2) is the third surface (S3) It extends from and may connect the third surface S3 and the upper surface. The third surface S3 is disposed different from the inclination angle of the first surface S1 and the second surface S2. In FIG. 4, the protrusion 142 is illustrated as having three side surfaces S1, S2, and S3, but the number of side surfaces is not limited thereto. For example, an additional surface may be included to connect the first surface S1 and the second surface S2. In addition, the plurality of side surfaces S1, S2, S3 may be connected to each other at different inclination angles.

Referring to FIG. 4, all of the side surfaces S1, S2, and S3 may be disposed to have a positive slope with respect to the base portion 141. The plurality of side surfaces S1, S2, and S3 disposed between the base portion 141 and the upper surface of the protrusion 442 may be disposed to have the same inclination direction on the cross-section. For example, referring to the left side of FIG. 4, a plurality of side surfaces S1, S2, and S3 may have a shape inclined toward the lower right of the mode, and all may have a negative slope. In addition, referring to the right side of FIG. 4, all of the side surfaces S1, S2, and S3 may have a shape inclined toward the lower left side, and all may have a positive inclination. The inclination angle of the plurality of side surfaces S1, S2, and S3 may decrease as the distance from the base portion 141 increases. For example, the absolute value of the inclination of the plurality of side surfaces S1, S2, and S3 may be smaller as the surface is disposed farther from the base portion 141.

In FIG. 4, it has been described that one third surface S3 is disposed between the first surface S1 and the second surface S2, but is not limited thereto, and the first surface S1 and the second surface S2 ), an additional surface may be arranged. For example, an inclination angle of a plurality of surfaces disposed between the first surface S1 and the second surface S2 may also decrease as the distance from the base portion 141 increases.

Referring to FIG. 4, a light emitting device 430 and a bank layer 414 are disposed on the overcoat layer 440. The light emitting device 430 includes a first electrode 431 disposed on the overcoat layer 440, a light emitting layer 432 disposed on the first electrode 431, and a second electrode 433 disposed on the light emitting layer 432. ). Accordingly, all of the reflective layer 431A, the transparent conductive layer 431B, the bank layer 414, the light emitting layer 432, and the second electrode 433 disposed on the over-coating layer 440 are all along the top surface of the over-coating layer 440. Can be formed.

The light emitting display device 400 according to another exemplary embodiment of the present invention may improve light extraction efficiency of the light emitting device 430 by using the overcoat layer 440 having the protrusion 442. Specifically, among the light emitted from the emission layer 432 of the light emitting display device 400, light emitted at a low emission angle may be extracted in the front direction by the reflective layer 431A disposed on the side of the protrusion 442. Accordingly, in the light emitting display device 400 according to another exemplary embodiment of the present invention, the reflective layer 431A disposed on the side of the overcoat layer 440 functions as a side mirror and is thus lost in the light emitting display device 400. Since the possible light can be extracted in the front direction, light extraction efficiency can be improved, and power consumption can be improved.

In addition, in the light emitting display device 400 according to another exemplary embodiment of the present invention, a side surface of the protrusion 442 is a first surface S1 extending from the base unit 141 and a first surface S1 extending from the upper surface of the protrusion 442. It includes a second surface (S2), and a third surface (S3) between the first surface (S1) and the second surface (S2). The inclination angle of the plurality of side surfaces S1, S2, and S3 may decrease as the distance from the base portion 141 increases. Accordingly, the light guided by total reflection between the reflective layer 431A and the second electrode 433 is near the boundary between the base portion 141 and the first surface S1, the first surface S1 and the third surface S3. ), in the vicinity of the boundary between the third surface (S3) and the second surface (S2), and in the vicinity of the boundary between the upper surface of the second surface (S2) and the protrusion 442. Can be. Accordingly, light that may be lost in the light emitting display device 400 can be extracted in the front direction, thereby improving light extraction efficiency and improving power consumption.

5 is a cross-sectional view of a luminescent labeling device according to another embodiment of the present invention. The overcoat layer 540 of the light emitting display device 500 of FIG. 5 is different from that of the light emitting display device 100 of FIGS. 1 and 2, and the other configurations are substantially the same, and thus, a duplicate description will be omitted.

Referring to FIG. 5, the overcoat layer 540 includes a base portion 141 and a protrusion portion 542. The protrusion 542 may be formed integrally with the base portion 141 to have a shape protruding from the base portion 141. Accordingly, the protrusion 441 may have an upper surface smaller than a lower surface. However, it is not limited thereto.

The protrusion 542 may include a first protrusion 542A and a second protrusion 542B. The first protrusion 542A and the second protrusion 542B may be separated. For example, an interface may exist between the first protrusion 542A and the second protrusion 542B. Accordingly, the first protrusion 542A may be formed at the same time as the base portion 141, and the second protrusion 542B may be formed in a process separate from the first protrusion 542A.

The protrusion 542 has an upper surface and a plurality of side surfaces S1, S2, S3. The upper surface of the protrusion 542 is a surface positioned at the top of the protrusion 542 and may be a surface substantially parallel to the base portion 141 or the substrate 110. The plurality of side surfaces S1, S2, and S3 may be surfaces connecting the upper surface of the protrusion 542 and the base part 141.

The plurality of side surfaces (S1, S2, S3) of the protrusion 542 include a first surface S1 extending from the base part 141, a second surface S2 extending from the upper surface of the protrusion 542, and a first It may include a third surface (S3) between the surface (S1) and the second surface (S2).

The first surface S1 may have a positive inclination angle based on the base part 141. The first surface S1 may be a side surface of the first protrusion 542A of the protrusion 542. In addition, the third surface S3 may be parallel to the base portion 141. The third surface S3 may be a part of the upper surface of the first protrusion 542A. Accordingly, the lower surface of the second protrusion 542B may be smaller than the upper surface of the first protrusion 542A. In addition, the second surface S2 may have a positive inclination angle with respect to the base portion 141. The second surface S2 may be a side surface of the second protrusion 542B.

In the light emitting display device 500 according to another exemplary embodiment, the protrusion 542 includes a first protrusion 542A and a second protrusion 542B, and the first protrusion 542A and the second protrusion 542B ) Can be arranged separately from each other. That is, the first protrusion 542A and the second protrusion 542B may be formed in separate processes. Accordingly, in the light emitting display device 500 according to another exemplary embodiment of the present invention, the shape of the side surfaces S1, S2, and S3 of the protrusion 542 may be more freely implemented. For example, since the protrusion 542 is not formed in a single process, the first protrusion 542A and the second protrusion 542B of the protrusion 542 are formed through a plurality of processes, so that the first protrusion 542A and The shape of the second protrusion 542B may be more freely implemented. Accordingly, in the vicinity of the boundary between the base portion 141 and the first surface S1 capable of extracting the light guided by total reflection between the reflective layer 131A and the second electrode 133 in the front direction, the first surface ( It is possible to more freely implement the vicinity of the boundary between S1) and the third surface (S3), the boundary between the third surface (S3) and the second surface (S2), and the boundary between the upper surface of the second surface (S2) and the protrusion 542. I can. Accordingly, a structure of the overcoat layer 540 capable of extracting light that may be lost in the light emitting display device 500 in the front direction may be more easily implemented.

In FIG. 5, it has been described that the protrusion 542 includes the first protrusion 542A and the second protrusion 542B, but the protrusion 542 may be formed of three or more lower protrusions.

6 is a cross-sectional view of a luminescent labeling device according to another embodiment of the present invention. The overcoat layer 640 of the light emitting display device 600 of FIG. 6 is different from that of the light emitting display device 400 of FIG. 4, and other configurations are substantially the same, and thus, a redundant description will be omitted.

Referring to FIG. 6, the overcoat layer 640 includes a base portion 141 and a protrusion portion 642. The protrusion 642 is formed integrally with the base part 141 and has a shape protruding from the base part 141. Accordingly, the protrusion 441 may have an upper surface smaller than a lower surface. However, it is not limited thereto.

The protrusion 642 may include a first protrusion 642A and a second protrusion 642B. The first protrusion 642A and the second protrusion 642B may be separated. For example, an interface may exist between the first protrusion 642A and the second protrusion 642B. Accordingly, the first protrusion 642A may be formed at the same time as the base portion 141, and the second protrusion 642B may be formed in a process separate from the first protrusion 642A.

The protrusion 642 has an upper surface and a plurality of side surfaces S1, S2, S3. The upper surface of the protrusion 642 is a surface positioned at the top of the protrusion 642 and may be a surface substantially parallel to the base portion 141 or the substrate 110. The plurality of side surfaces S1, S2, and S3 may be surfaces connecting the upper surface of the protrusion 642 and the base part 141.

The plurality of side surfaces (S1, S2, S3) of the protrusion 642 include a first surface S1 extending from the base part 141, a second surface S2 extending from the upper surface of the protrusion 642, and a first It may include a third surface (S3) between the surface (S1) and the second surface (S2).

The first surface S1 may have a positive inclination angle based on the base part 141. The first surface S1 may be a side surface of the first protrusion 642A of the protrusion 642. In addition, the third surface S3 may have a positive inclination angle based on the base part 141, but may be smaller than the inclination angle of the first surface S1. The third surface S3 may be a side surface of the second protrusion 642B. Further, the second surface S2 may have a positive inclination angle based on the base portion 141, but may be smaller than the inclination angle of the third surface S3. The second surface S2 may be a side surface of the second protrusion 642B.

In the light emitting display device 600 according to another embodiment of the present invention, the protrusion 642 includes a first protrusion 642A and a second protrusion 642B, and the first protrusion 642A and the second protrusion 642B ) Can be arranged separately from each other. For example, the first protrusion 642A and the second protrusion 642B may be formed in separate processes. Accordingly, in the light emitting display device 600 according to another exemplary embodiment of the present invention, the shape of the side surfaces S1, S2, and S3 of the protrusion 642 may be more freely implemented.

7 is a cross-sectional view of a light emitting display device according to another exemplary embodiment of the present invention. Compared to the light-emitting display device 100 of FIGS. 1 and 2, the light-emitting element 730 is different and the encapsulation part 750 is added, and the other configurations are substantially the same, so a redundant description will be omitted. .

Referring to FIG. 7, a light emitting device 730 is disposed on the overcoat layer 140. The light emitting device 730 includes a first electrode 131 disposed on the overcoat layer 140, a light emitting layer 132 disposed on the first electrode 131, and a second electrode 733 disposed on the light emitting layer 132. ).

The second electrode 733 is disposed on the emission layer 132. For example, the second electrode 733 may be disposed on the emission layer 132 according to the shape of the emission layer 132. The second electrode 133 supplies electrons to the light emitting layer 132. The second electrode 733 may be made of a transparent conductive material. For example, the second electrode 733 is Indium Tin Oxide (ITO), Indium Zin Oxide (IZO), Indium Tin Zinc Oxide (ITZO), Zinc Oxide (Zinc Oxide, ZnO) and tin oxide (Tin Oxide, TO)-based transparent conductive oxide or ytterbium (Yb) alloy may be formed, but is not limited thereto. When the second electrode 733 is made of a transparent conductive oxide such as indium tin oxide (ITO), the refractive index of the second electrode 733 may be about 1.8 to 1.9.

Referring to FIG. 7, the encapsulation part 750 is disposed on the overcoat layer 140 and the light emitting device 730. The encapsulation unit 750 may block oxygen and moisture penetrating into the light emitting display 700 from the outside. For example, when the light emitting display device 700 is exposed to moisture or oxygen, a pixel shrinkage phenomenon in which the emission area is reduced or black spots in the emission area may occur. Accordingly, the encapsulation unit 750 may protect the light emitting display device 700 by blocking oxygen and moisture.

Referring to FIG. 7, the encapsulation portion 750 includes a first inorganic layer 751, an organic layer 752, and a second inorganic layer 753.

The first inorganic layer 751 may be disposed on the second electrode 733 to suppress penetration of moisture or oxygen. The first inorganic layer 751 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), or aluminum oxide (AlyOz), but is not limited thereto. The first inorganic layer 751 may be made of a material having a higher refractive index than the organic layer 752, and for example, when the first inorganic layer 751 is made of silicon nitride (SiNx) or silicon oxynitride (SiNxOy), The refractive index of the first inorganic layer 751 may be about 1.8.

The organic layer 752 may be disposed on the first inorganic layer 751 to planarize the surface. In addition, the organic layer 752 may cover foreign substances or particles that may occur during a manufacturing process. The organic layer 752 may be formed of an organic material, for example, silicon oxycarbon (SiOxCz), acrylic or epoxy-based resin, but is not limited thereto. The organic layer 752 may be made of a material having a lower refractive index than the first inorganic layer 751. For example, when the organic layer 752 is an acrylic resin, the refractive index of the organic layer 752 is about 1.5 to about 1.6. It can be about.

The second inorganic layer 753 is disposed on the organic layer 752, and like the first inorganic layer 751, penetration of moisture or oxygen can be suppressed. The second inorganic layer 752 may be made 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 second inorganic layer 753 may be made of the same material as the first inorganic layer 751 or may be made of a different material.

In addition, in the light emitting display device 700 according to another exemplary embodiment of the present invention, the protrusion 142 of the overcoat layer 140 includes a plurality of surfaces having different inclination angles, so that light extraction efficiency can be further improved. have. For example, some of the light emitted from the emission layer 132 may be totally reflected between the first electrode 131 disposed under the emission layer 132 and the organic layer 752 of the encapsulation unit 750 and may be trapped. The organic material constituting the emission layer 132 has a refractive index of about 1.8, and when the second electrode 733 is made of a material having a refractive index similar to that of the emission layer 132 as described above, the emission layer 132 and the second The electrode 733 and the first inorganic layer 751 may have substantially the same refractive index. Accordingly, among the light emitted from the emission layer 132 and incident on the organic layer 752, light incident at an incidence angle greater than or equal to the critical angle may be reflected back to the emission layer 132. Therefore, the light reflected by the light emitting layer 132 is reflected back from the reflective layer 131A of the first electrode 131 and enters the organic layer 752, and is repeatedly totally reflected between the reflective layer 131A and the organic layer 752. You can get trapped.

Accordingly, in the light emitting display device 700 according to another embodiment of the present invention, the side surface of the protrusion 142 is the first surface S1 extending from the base unit 141 and the first surface S1 extending from the upper surface of the protrusion 142. It includes a second surface (S2), and a third surface (S3) between the first surface (S1) and the second surface (S2). The first surface S1 may have a positive inclination angle with respect to the base part 141, the third surface S3 may be parallel to the base part 141, and the second surface S2 is the base part. It can have a positive inclination angle based on (141). Accordingly, the light guided by total reflection between the reflective layer 131A and the organic layer 752 is extracted in the front direction by changing the traveling direction on the side of the protruding portion 142. For example, the light guided by total reflection between the reflective layer 131A and the organic layer 752 is near the boundary between the base portion 141 and the first surface S1, the first surface S1 and the third surface In the vicinity of the boundary of (S3), the boundary between the third surface (S3) and the second surface (S2), and near the boundary between the upper surface of the second surface (S2) and the protrusion 142, the total reflection condition is not met. Can be extracted with Therefore, in the light-emitting display device 700 according to another embodiment of the present invention, light that may be lost in the light-emitting display device 700 can be extracted in the front direction, so that light extraction efficiency can be improved and consumption Power can be improved.

The structure and constituent material of the encapsulation unit 750 applied to the light-emitting display device 700 according to another exemplary embodiment of the present invention, and the constituent material of the second electrode 733 of the light-emitting element 730 are various implementations of the present invention. It is applicable to all of the light emitting display devices 100, 300, 400, 500, and 600 according to the examples.

Hereinafter, the effect of the light emitting display device 100 according to an exemplary embodiment will be described with reference to 8A and 8B in order to describe in more detail.

8A is a simulation of a path of light in the display device according to the comparative example. 8B is a simulation of a path of light in a display device according to an exemplary embodiment of the present invention. 8B is a simulation of a path of light in the light emitting display device 100 according to an exemplary embodiment of the present invention. In FIG. 8B, a portion corresponding to the overcoat layer 140 of the light emitting display device 100 according to an exemplary embodiment of the present invention is denoted by A', and the reflective layer 131A disposed on the overcoat layer 140 is denoted by B'. And the light emitting layer 132 disposed between the reflective layer 131A and the second electrode 133 is indicated by C′, and the components disposed on the second electrode 133 and the second electrode 133 are indicated by It is expressed as D'assuming that it is an air layer. In the light emitting display device according to the comparative example of FIG. 8A, compared to the display device 100 according to an exemplary embodiment of the present invention, other components are substantially different except that the side surface of the overcoat layer is not composed of a plurality of surfaces. same. In FIG. 8A, a portion corresponding to the over-coating layer is denoted by A, the reflective layer disposed on the over-coating layer is denoted by B, and the light emitting layer disposed between the reflective layer and the second electrode is denoted by C, and the second electrode and the second electrode The component disposed on the electrode is denoted as D on the assumption that it is an air layer. 8A and 8B show that in the Ray Optics simulation program, the refractive index of the overcoat layers (A, A') is set to 1.5, the refractive indexes of the light emitting layers (C, C') are 1.8, and the refractive indexes of the air layers (D, D') are It was set to 1. The simulations of FIGS. 8A and 8B are simulations of light extraction occurring at the side of the protrusions of the overcoat layers A and A', and thus the illustration of the light emitted to the central region is omitted.

In Comparative Examples and Examples according to the simulation results, the number of light emitted from the side of the protrusion of the overcoat layer (A, A') to the outside is shown in Table 1 below.

Number of light Increase rate (%) Comparative example 7 - Example 14 100%

First, referring to FIG. 8A, in a comparative example, it is understood that the light that was guided by being totally reflected between the reflective layer (B) and the air layer (D) is extracted into the air layer (D) at the first point P1 and the second point P2. can do. The first point (P1) and the second point (P2) are points at which the inclination angle of the surface constituting the overcoat layer (A) is changed, and the light reflected and waved along the upper surface of the reflective layer (B) is transmitted to the first point (P1). It indicates that the light path is changed at the second point P2 and does not correspond to the total reflection condition, and light is extracted to the air layer D.

Next, referring to FIG. 8B, in the light emitting display device 100 according to an exemplary embodiment of the present invention, a side surface of the protrusion of the overcoat layer A′ includes a plurality of surfaces, and a reflective layer ( B') and the light emitting layer (C') are formed along the surface of the overcoat layer (A'). Accordingly, compared to the comparative example shown in FIG. 8A, the third point P3 and the fourth point P4 at which the inclination angle changes are additionally disposed.

Accordingly, in the embodiment of the present invention, the light that has been totally reflected and guided between the reflective layer B'and the air layer D'is transmitted to the first point P1, the second point P2, the third point P3, and It can be said that it is extracted into the air layer D'at point P4. Therefore, in the example, the point at which light is extracted to the air layer (D') was added more than the comparative example, and accordingly, the number of light extracted to the air layer (D') as shown in [Table 1] is doubled I can.

The light emitting display device according to the exemplary embodiments may be described as follows.

A light emitting display device according to an embodiment of the present invention includes a substrate, an insulating layer disposed on the substrate and having a base portion and a protrusion, a first electrode, an insulating layer, and a first electrode disposed to cover side portions of the base and the protrusion And a bank layer covering a part of the first electrode, and a light emitting layer and a second electrode disposed on the bank layer, and side portions of the protrusions have a plurality of surfaces configured with different inclination angles.

According to another feature of the present invention, the plurality of surfaces may constitute a zigzag shape.

According to another feature of the present invention, at least one of the plurality of surfaces may be parallel to the base portion.

According to another feature of the present invention, all of the plurality of surfaces may have a positive inclination angle based on the base portion.

According to another feature of the present invention, the inclination angle of the plurality of surfaces may decrease as the distance from the base portion increases.

According to another feature of the present invention, the protrusion includes a first protrusion on the base portion and a second protrusion on the first protrusion, and the first protrusion and the second protrusion may be separated.

According to another feature of the present invention, a lower surface of the second protrusion may be smaller than an upper surface of the first protrusion.

According to another feature of the present invention, the side portion of the protrusion may include a side surface of the first protrusion, an upper surface of the first protrusion that does not overlap with the second protrusion, and a side surface of the second protrusion.

According to another feature of the present invention, the side portion of the protrusion may be composed of a side surface of the first protrusion and a side surface of the second protrusion.

According to another feature of the present invention, the refractive index of the second electrode may be less than that of the light emitting layer.

According to another feature of the present invention, the light emitting display device is disposed on the second electrode, further includes an encapsulation portion in which an inorganic layer, an organic layer, and a second inorganic layer are stacked, and the light emitting layer, the second electrode, and the first inorganic layer are The refractive index may be greater than the refractive index of the organic layer.

A light-emitting display device according to another exemplary embodiment of the present invention includes a substrate, an insulating layer including a base portion and a protrusion on the substrate, and a light emitting device disposed in contact with the insulating layer, and including a first electrode, a light emitting layer, and a second electrode. And, the side portion of the protrusion on which the light emitting device is disposed includes a plurality of surfaces to improve light extraction efficiency for light emitted from the light emitting device.

According to another feature of the present invention, the upper surface of the protrusion may be smaller than the lower surface of the protrusion.

According to another feature of the present invention, the plurality of faces include a first face extending from the base portion, a second face extending from the upper face of the protrusion, and connecting the first face and the second face, and the first face and the second face The second side and the third side having different inclination angles may be included.

According to another feature of the invention, the third surface may be parallel to the base portion.

According to another feature of the present invention, a sign of the slope of the third surface may be opposite to that of the first surface and the slope of the second surface.

According to another feature of the present invention, the inclination angle of the first surface may be greater than that of the third surface, and the inclination angle of the third surface may be greater than the inclination angle of the second surface.

According to another feature of the present invention, the protrusion may include a plurality of protrusions separated from each other.

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 can 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 not limiting. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100, 300, 400, 500, 600: light-emitting display device
110: substrate
111: buffer layer
112: gate insulating layer
114, 314, 414, 514, 614: bank layer
117: etch stopper
120: thin film transistor
121: gate electrode
122: active layer
123: source electrode
124: drain electrode
130, 330, 430, 530, 630, 730: light-emitting element
131, 331, 431, 531, 631: first electrode
131A, 331A, 431A, 531A, 631A: reflective layer
131B, 331B, 431B, 531B, 631B: transparent conductive layer
132, 332, 432, 532, 632: light emitting layer
133, 333, 433, 533, 633, 733: second electrode
140, 340, 440, 540, 640: overcoat layer
141: base portion
142, 342, 442, 542, 642: protrusions
542A, 642A: first protrusion
542B, 642B: second protrusion
750: bag
751: first inorganic layer
752: organic layer
753: second inorganic layer
A/A: display area
N/A: Non-display area
SP: sub pixel
A1: light emitting area
A2: Non-luminous area
P1: first point
P2: second point
P3: 3rd point
P4: 4th point

Claims (18)

Board;
An insulating layer disposed on the substrate and having a base portion and a protrusion portion;
A first electrode disposed to cover side portions of the base portion and the protrusion portion;
A bank layer covering a portion of the insulating layer and the first electrode; And
A light emitting layer and a second electrode disposed on the first electrode and the bank layer,
The light emitting display device, wherein side portions of the protrusions have a plurality of surfaces configured with different inclination angles. The method of claim 1,
The light emitting display device, wherein the plurality of surfaces have a zigzag shape. The method of claim 1,
At least one of the plurality of surfaces is parallel to the base portion. The method of claim 1,
All the plurality of surfaces have a positive inclination angle with respect to the base part. The method of claim 4,
The inclination angle of the plurality of surfaces decreases as a distance from the base portion increases. The method of claim 1,
The protrusion includes a first protrusion on the base part and a second protrusion on the first protrusion,
The first and second protrusions are separated from each other. The method of claim 6,
A lower surface of the second protrusion is smaller than an upper surface of the first protrusion. The method of claim 6,
A side portion of the protrusion includes a side surface of the first protrusion, an upper surface of the first protrusion not overlapping with the second protrusion, and a side surface of the second protrusion. The method of claim 6,
A side portion of the protrusion includes a side surface of the first protrusion and a side surface of the second protrusion. The method of claim 1,
The light emitting display device, wherein a refractive index of the second electrode is smaller than a refractive index of the emission layer. The method of claim 1,
It is disposed on the second electrode, further comprising a first inorganic layer, an organic layer, and an encapsulation portion stacked with the second inorganic layer,
The light emitting display device, wherein a refractive index of the emission layer, the second electrode, and the first inorganic layer is greater than that of the organic layer. Board;
An insulating layer including a base portion and a protrusion on the substrate; And
It is disposed so as to be in contact with the insulating layer and includes a light emitting device including a first electrode, a light emitting layer, and a second electrode,
The light emitting display device, wherein a side portion of the protrusion on which the light emitting element is disposed includes a plurality of surfaces to improve light extraction efficiency for light emitted from the light emitting element. The method of claim 12,
An upper surface of the protrusion is smaller than a lower surface of the protrusion. The method of claim 13,
The plurality of sides,
A first surface extending from the base portion;
A second surface extending from an upper surface of the protrusion; And
A light emitting display device comprising: a third surface connecting the first surface and the second surface, and having a different inclination angle from the first surface and the second surface. The method of claim 14,
The third surface is parallel to the base portion. The method of claim 14,
A light emitting display device, wherein a slope of the third surface is opposite to a slope of the first surface and a slope of the second surface. The method of claim 14,
The inclination angle of the first surface is greater than the inclination angle of the third surface,
An inclination angle of the third surface is greater than an inclination angle of the second surface. The method of claim 12,
The light emitting display device, wherein the protrusion includes a plurality of protrusions separated from each other.

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