Light-emitting display device

Abstract

Disclosed is a light emitting display device including: a substrate including a plurality of sub-pixels; a first coating layer provided on the entire surface of the substrate; a second coating layer disposed on the first coating layer in each of the plurality of sub-pixels, and having a side surface overlapping a reflection region of each sub-pixel; a first electrode overlapping the light emitting region of each sub-pixel and disposed on an upper surface of the second coating layer; an intermediate layer on the first coating layer, the second coating layer, and the first electrode; and a second electrode on the intermediate layer and having a higher reflectivity than the first electrode. Each sub-pixel is configured such that the reflection region is located outside the light emitting region; and a second electrode positioned along a side surface of the second coating layer in the reflective region to surround an end portion of the first electrode.

Description

Technical Field

[0001] The present disclosure relates to a light-emitting display device, and more particularly, to a light-emitting display device that can improve light extraction efficiency by extracting light lost in an optical waveguide mode to the outside of a substrate. Background Art

[0002] As society enters the information age, the field of display devices that visually display electronic information signals is rapidly developing. Therefore, research is continuing on the performance development of various display devices, such as reducing thickness, weight, and power consumption.

[0003] Among them, a light-emitting display device includes a light-emitting element which is a self-luminous element, and does not require any separate light source used in a non-luminous element, thereby being able to reduce weight and thickness.

[0004] The light emitting element includes a first electrode, a second electrode, and an intermediate layer including various organic and / or inorganic materials located between the first electrode and the second electrode, and emits light by applying an electric field between the first electrode and the second electrode. Here, the light emitted from the intermediate layer may not escape to the outside of the substrate, but may be confined within the light emitting element, and thus, the light extraction efficiency of the light escaping to the outside of the substrate is reduced compared to the original light emitting efficiency of the light emitting element.

[0005] In particular, part of the light generated during this process is confined within the optical waveguide mode formed by the refractive index difference between the first electrode and the intermediate layer. Therefore, not all of the light generated from the light emitting element escapes to the outside of the substrate, resulting in reduced light extraction efficiency. Summary of the invention

[0006] Accordingly, the present disclosure is directed to a light emitting display device that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0007] An object of the present disclosure is to provide a light-emitting display device which can improve forward light extraction efficiency by extracting light confined in an optical waveguide mode toward the front of a substrate.

[0008] Another object of the present disclosure is to provide a light emitting display device which can improve viewing angle characteristics by extracting light confined in an optical waveguide mode in a lateral direction.

[0009] Another object of the present disclosure is to provide a light-emitting display device that can save space, provide bright sub-pixels, reduce power consumption, and provide a wider viewing angle.

[0010] Additional advantages, objectives and features of the present disclosure will be described in part in the following description, and in part will become clear to those of ordinary skill in the art after studying the following, or may be learned from the practice of the present disclosure. The purposes and other advantages of the present disclosure may be achieved and obtained through the structures specifically indicated in the written description and the accompanying drawings.

[0011] The light-emitting display device of the present disclosure enables the end of the first electrode to surround the parabolic second electrode, thereby being able to release light generated from the intermediate layer that cannot escape to the outside of the substrate, especially to release light in an optical waveguide mode.

[0012] To achieve these objectives and other advantages, and in accordance with the purposes of the present disclosure, as embodied and broadly described herein, a light-emitting display device includes: a substrate including a plurality of sub-pixels; a first coating layer disposed on the entire surface of the substrate; a second coating layer disposed on the first coating layer in each of the plurality of sub-pixels and having a side surface configured to overlap with a reflective region of each of the plurality of sub-pixels; a first electrode configured to overlap with a light-emitting region of each of the plurality of sub-pixels and disposed on an upper surface of the second coating layer; an intermediate layer disposed above the first coating layer, the second coating layer and the first electrode; and a second electrode disposed above the intermediate layer and configured to have a higher reflectivity than the first electrode. Each of the plurality of sub-pixels is configured so that the reflective region is located outside the light-emitting region; and the second electrode is positioned along the side surface of the second coating layer in the reflective region to surround an end of the first electrode.

[0013] To achieve these objects and other advantages, and in accordance with the purposes of the present disclosure, as embodied and broadly described herein, a light emitting display device includes: a substrate including a plurality of sub-pixels; a coating layer located on the substrate, the coating layer including a flat region overlapping with a light emitting region of each of the plurality of sub-pixels, and a first concave region surrounding the flat region and overlapping with a reflective region of each of the plurality of sub-pixels; a first electrode located on the flat region of the coating layer; an intermediate layer located above the coating layer and the first electrode; and a second electrode located above the intermediate layer, the second electrode being positioned along the first concave region of the coating layer to surround an end of the first electrode. The second electrode has a higher reflectivity than the first electrode.

[0014] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0016] Figure 1 is a plan view of a light emitting display device according to an embodiment of the present disclosure;

[0017] Figure 2 According to the embodiment of the present disclosure Figure 1 A cross-sectional view taken along line II′;

[0018] Figure 3 According to the embodiments of the present disclosure Figure 2 Enlarged view of middle area A1;

[0019] Figure 4A is a diagram showing a light waveguide path of a light emitting display device according to an embodiment of the present disclosure;

[0020] Figure 4B is a diagram plotting a parabolic region of a second electrode according to an embodiment of the present disclosure in a coordinate system;

[0021] Figure 5A According to the embodiment of the present disclosure, Figure 1 A cross-sectional view taken along line II-II′;

[0022] Figure 5B is a diagram showing another embodiment of the present disclosure. Figure 1 A cross-sectional view taken along line II-II′;

[0023] Figure 6 is a plan view of a light emitting display device according to another embodiment of the present disclosure;

[0024] Figure 7 According to the embodiment of the present disclosure Figure 6 A cross-sectional view taken along line III-III′;

[0025] Figure 8 According to the embodiments of the present disclosure Figure 7 An enlarged view of area A2;

[0026] Fig.9A is a diagram showing a light waveguide path of a light emitting display device according to an embodiment of the present disclosure;

[0027] Fig. 9B is a diagram showing a parabolic region of a second electrode according to an embodiment of the present disclosure in a coordinate system; and

[0028] Fig.10 is a diagram showing light distribution in an optical waveguide mode according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] With reference to the accompanying drawings, the advantages and features of the present disclosure and the methods for implementing the present disclosure will be clearly understood from the following preferred embodiments. However, the present disclosure is not limited to these embodiments and can be embodied in different forms. The embodiments are proposed only to provide a thorough and complete understanding of the disclosed content and to fully inform those skilled in the art of the technical concept of the present disclosure.

[0030] The shapes, sizes, proportions, angles, quantities, etc. shown in the drawings for illustrating various embodiments of the present disclosure are provided for illustration only, and the present disclosure is not limited to the contents shown in the drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or similar components. In the following description, detailed descriptions of techniques or configurations related to the present disclosure may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure.

[0031] When terms such as "including," "having," and "comprising" are used throughout this disclosure, additional components may be present unless "only" is used. Components described in the singular encompass their plural nature unless specifically stated otherwise.

[0032] Even without additional specific description, the components included in the embodiments of the present disclosure should be construed as including the error range.

[0033] When describing various embodiments of the present disclosure, when terms such as "on," "above," "below," and "beside" are used to describe positional relationships, there may be at least one intervening element between two elements unless "immediately adjacent" or "directly" is also used.

[0034] When describing various embodiments of the present disclosure, when terms related to a time relationship such as "after," "subsequently," "next," and "before" are used, non-sequential cases may be included unless "immediately after" or "directly" is also used.

[0035] When describing various embodiments of the present disclosure, terms such as "first" and "second" may be used to describe various components, but these terms are intended only to distinguish identical or similar components from each other. Therefore, unless specifically mentioned otherwise, throughout the present disclosure, a "first" component may be identical to a "second" component within the technical concept of the present disclosure.

[0036] The terms “first horizontal axis direction”, “second horizontal axis direction” and “vertical axis direction” should not be interpreted as only geometric relationships that are perpendicular to each other, but should have a wider range of directions as long as the configuration of the present disclosure is functionally possible.

[0037] The term "at least one" should be understood to include all possible combinations of one or more related items. For example, "at least one of the first, second, and third items" refers to each of the first, second, or third items, and any combination of two or more of the first, second, and third items.

[0038] The features of various embodiments of the present disclosure may be partially or completely connected or combined with each other, and may interoperate and technically drive each other in various ways. The embodiments of the present disclosure may be implemented independently of each other, or may be implemented together in a manner associated with each other.

[0039] When adding reference numerals to components in each figure, even if the same components are shown in different figures, they may have the same reference numerals as much as possible. In addition, for ease of explanation, the proportions of the components shown in the drawings are different from the actual proportions and are therefore not limited to the proportions shown in the drawings.

[0040] Hereinafter, exemplary examples of a light emitting display device according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 is a schematic plan view of a light-emitting display device 1 of the present disclosure according to an embodiment of the present disclosure.

[0042] Reference Figure 1 The light-emitting display device 1 may include a substrate 10 ( Figure 2 ) and a thin film transistor TFT provided in each of a plurality of sub-pixels P1, P2, P3 and P4.

[0043] The substrate 10 may be divided into an active area for displaying an image and an inactive area for not displaying an image, and the active area may be formed by repeatedly arranging a plurality of sub-pixels P1, P2, P3, and P4. For example, if the substrate 10 is a plastic substrate, it may include polyimide or polyamide.

[0044] A plurality of sub-pixels P1, P2, P3, and P4 may emit light of different colors, and may emit red light, white light, green light, and blue light, respectively. In some cases, a sub-pixel emitting white light may be omitted, and a sub-pixel emitting at least two of red light, green light, blue light, yellow light, magenta light, or cyan light may be provided. However, the present disclosure is not limited thereto.

[0045] although Figure 1 It is illustrated that the plurality of sub-pixels P1 , P2 , P3 , and P4 have the same area, but the present disclosure is not limited thereto, and the plurality of sub-pixels P2 , P3 , and P4 may be formed to have different areas in consideration of light emitting characteristics of each sub-pixel.

[0046] The plurality of sub-pixels P1, P2, P3, and P4 may be defined by gate lines and data lines formed in a matrix form, crossing each other on the substrate 10. In addition, in the present disclosure, a power supply voltage line configured to provide a high voltage to the plurality of sub-pixels P1, P2, P3, and P4 and a reference voltage line configured to provide a reference voltage to the plurality of sub-pixels P1, P2, P3, and P4 may be provided. Figure 1 , the second line 55b, the third line 55c, the fifth line 55e and the sixth line 55f may be data lines, the first line 55a and the seventh line 55g may be power supply voltage lines, and the fourth line 55d may be a power supply voltage line. The first to seventh lines 55a, 55b, 55c, 55d, 55e, 55f and 55g may be arranged to be spaced apart from each other in one direction.

[0047] In addition, the eighth line 55i and the ninth line 55j may be arranged in a direction intersecting the first to seventh lines 55a, 55b, 55c, 55d, 55e, 55f and 55g. The eighth line 55i may be conductively connected to the first line 55a and provide the power supply voltage of the first line 55a to the adjacent second sub-pixel P2. The ninth line 55j may be conductively connected to the seventh line 55g and provide the power supply voltage of the seventh line 55g to the adjacent third sub-pixel P3. In addition, the gating line may be arranged in a direction intersecting the first to seventh lines 55a, 55b, 55c, 55d, 55e, 55f and 55g.

[0048] A plurality of thin film transistors may be provided in each of the plurality of sub-pixels P1, P2, P3, and P4. For ease of explanation, the present disclosure illustrates one thin film transistor TFT. That is, the present disclosure is not limited thereto, and a driving thin film transistor, a switching thin film transistor, a sensing thin film transistor, a capacitor, etc. may be provided to drive each sub-pixel.

[0049] The thin film transistor TFT may include a source electrode 45b, a drain electrode 45a, and a gate electrode 43. Upon receiving a data signal from the gate electrode 43, the thin film transistor TFT may provide a driving voltage provided from a power supply voltage to the first electrode 61. Here, in the thin film transistor TFT, the first gate line 55a and the source electrode 45b may be connected to receive the power supply voltage, and when the thin film transistor TFT receives the data signal and thus the channel region of the active layer 37 is activated by the gate electrode 43, the thin film transistor TFT may control the power supply voltage through the drain electrode 45a connected to the first electrode 61 to be transmitted to the first electrode 61, thereby being able to drive the corresponding sub-pixel.

[0050] Each of the plurality of sub-pixels P1, P2, P3, and P4 may include a light emitting area EA and a non-light emitting area NEA around the light emitting area EA. The light emitting area EA may be a region where light is actually emitted. Specifically, by bonding the first electrode 61 and the second electrode 65 ( Figure 2 ) form an electric field between the intermediate layer 63 (e.g., the light-emitting layer) ( Figure 2 The non-emission area NEA may be an area where light is not actually emitted by the first electrode 61, the second electrode 65, and the intermediate layer 63.

[0051] In addition, the light emitting area EA may overlap with the patterned first electrode 61. Figure 2 In the embodiment, the reserved area on the coating layer 50 where the patterned first electrode 61 is provided can form the light emitting area EA. In addition, the non-reserved area where the patterned first electrode 61 is not provided can form a reflected light emission area (e.g., a reflective area). Since the first electrode 61 is not provided in the non-reserved area, at least one of the intermediate layer 63 or the second electrode 65 can be in direct contact with the coating layer 50. In addition, as the reflected light emission area, an area where at least two lines (or wirings) of the first line to the seventh line 55a, 55b, 55c, 55d, 55e, 55f and 55g arranged in one direction partially overlap (e.g., an area between two adjacent sub-pixels) can be provided.

[0052] The light emitting area EA according to the first embodiment may be disposed in the flat area FA having a flat surface in which the first electrode 61 is disposed. That is, the light emitting area EA may overlap with a portion of the flat area FA except for the edge of the flat area FA, and may overlap with a portion of the first electrode 61 except for at least the contact hole CH of the first electrode 61. Specifically, the present disclosure may be provided with a bank 67 ( Figure 5A). Here, the area where the embankment 67 is formed can define an opening, and the area where the embankment 67 is not formed can define a non-opening portion. The embankment 67 of the present disclosure can cover the thin film transistor area TA in which the thin film transistor TFT is provided in the non-opening portion. In addition, the embankment 67 can contact the light emitting area EA along one direction in the opening. Therefore, the remaining part of the edge of the first electrode 61 except for at least one side of the edge of the first electrode 61 can be exposed from the embankment 67. Here, the area of ​​the first electrode 61 covered by the embankment 67 can be a region in which the thin film transistor TFT is provided, or can be at least a region of the contact hole CH connected to the thin film transistor TFT. It will be described later. Figure 5A and Figure 5B The bank 67 is described in detail in the figure. Returning to the above, the present disclosure can prevent the light emitted from the light emitting area EA from being refracted or lost through the bank 67 by exposing the edge of the first electrode 61 from the bank 67. Therefore, the present disclosure can extract light from a wider area than the light emitting area EA from which the light is actually emitted. That is, in the present disclosure, the area from which light is extracted from the substrate 10 is not limited to the light emitting area EA, and can also include a portion of the non-light emitting area NEA around the light emitting area EA that can also extract light and redirect the light out of the display device.

[0053] In the present disclosure, the non-luminous area NEA may have an area that emits light. The light-emitting display device according to the present disclosure may release light emitted from the light-emitting area EA to the non-luminous area NEA through the second electrode 65 surrounding the end of the first electrode 61. Here, the light-emitting display device of the present disclosure may include a reflective area RA in the non-luminous area NEA in which the light from the light-emitting area EA is reflected. Here, the reflective area RA may include the above-mentioned reflective light emitting area. In other words, the second electrode 65 may include a reflective material, and at least a portion of the second electrode 65 disposed between adjacent first electrodes may be used to reflect more light out of the device. For example, light emitted in a lateral direction that would otherwise be lost or limited may be reflected by the second electrode 65 and redirected out of the display device and toward the user.

[0054] The reflective area RA may be disposed outside the flat area FA along the edge of the flat area FA. That is, the reflective area RA may be disposed along the edge of the first electrode 61, spaced apart from the first electrode 61 and the edge of the light-emitting area EA. The reflective area RA or the reflective light emitting area may be formed to surround at least three surfaces of the light-emitting area EA. In detail, the reflective area RA or the reflective light emitting area may be formed to surround at least three surfaces of the flat area FA. That is, the reflective area RA may be omitted from a portion of the edge of the first electrode 61 corresponding to the area where the thin film transistor TFT is disposed. The reflective area RA is a component for light extraction and may not be disposed in the thin film transistor area TA, which may be an area where light is not extracted in some cases. However, the present disclosure is not limited thereto, and the reflective area RA may be disposed along all portions of the edge of the first electrode 61.

[0055] The reflection area RA may include a first reflection area RA1 and a second reflection area RA2 disposed outside the first reflection area RA1. The first reflection area RA1 and the second reflection area RA2 may have different functions for light generated from the light emitting area EA. The first reflection area RA1 may reflect the light generated from the light emitting area EA in a forward direction perpendicular to the substrate 10. The second reflection area RA2 may reflect the light generated from the light emitting area EA in a lateral direction intersecting the substrate 10. Here, the direction intersecting the substrate 10 may be a direction moving toward the substrate 10 at an angle different from the forward direction. In this way, since the first reflection area RA1 and the second reflection area RA2 have different functions, one of the first reflection area RA1 and the second reflection area RA2 may have a larger area depending on the direction in which light is to be extracted. For example, in the present disclosure, the second reflection area RA2 may be formed to have a larger area than the first reflection area RA1 to improve the viewing angle.

[0056] In addition, the reflective area RA may further include a third reflective area RA3 ( Figure 3 The third reflective area RA3 is located above the first electrode 61 and may reflect light generated from the light emitting area EA including the light waveguide mode in a forward direction of the substrate 10. Such a third reflective area RA3 may include a flat area FA.

[0057] In the following, reference will be made to Figures 2 to 5B A light emitting display device of the present disclosure according to a first embodiment is described in detail. Figure 2 According to the embodiment of the present disclosure Figure 1 A cross-sectional view taken along line II′. Figure 3 yes Figure 2 An enlarged view of area A1. Figure 4Ais a diagram showing a light waveguide path of a light emitting display device according to an embodiment, and Figure 4B is a diagram plotting a parabolic region of the second electrode according to an embodiment of the present disclosure in a coordinate system. Figure 5A and Figure 5B is a diagram showing different embodiments of the Figure 1 A cross-sectional view taken along line II-II′.

[0058] Reference Figure 2 According to one embodiment of the present disclosure, a light-emitting display device may include: a substrate 10 including a plurality of sub-pixels P1, P2, P3 and P4, a first coating layer 51 disposed on the entire surface of the substrate 10, a second coating layer 53 located on the first coating layer 51 in each of the plurality of sub-pixels P1, P2, P3 and P4 and having a side surface 53b overlapping with a reflective area RA of each of the plurality of sub-pixels P1, P2, P3 and P4, a first electrode 61 disposed on an upper surface 53c of the second coating layer 53 and overlapping with a light-emitting area EA of each of the plurality of sub-pixels P1, P2, P3 and P4, an intermediate layer 63 disposed on the first coating layer 51, and a second electrode 65 disposed on the intermediate layer 63 and having a higher reflectivity than the first electrode 61. Multiple sub-pixels P1, P2, P3 and P4 can be constructed so that the reflective area RA is located outside the light-emitting area EA of each of the multiple sub-pixels P1, P2, P3 and P4, and the second electrode 65 is positioned along the side surface 53b of the second coating layer 53 in the reflective area RA to surround the end 61a of the first electrode 61.

[0059] The light-emitting display device according to the first embodiment of the present disclosure may include a first color filter 71, a third color filter 73, and a fourth color filter 75 in regions corresponding to the first subpixel P1, the third subpixel P3, and the fourth subpixel P4 of the substrate 10, respectively, and may include a light-emitting element 60 on the coating layer 50 covering the first color filter 71, the third color filter 73, and the fourth color filter 75. The second subpixel P2 without a color filter may be a subpixel emitting white light.

[0060] The buffer film 20, the interlayer insulating film 30 and the passivation layer 40 may be sequentially disposed on the substrate 10 with the transistor TFT and the light shielding layer 21 interposed therebetween. Figure 1 The plurality of lines 55a, 55b, 55c, 55d, 55e, 55f, 55g, 55i, and 55j may be located on the interlayer insulating film 30 and may be formed to be aligned with the source electrode 45b and the drain electrode 45a ( Figure 5A and Figure 5B in the same layer.

[0061] Color filters 71, 73, and 75 corresponding to the first subpixel P1, the third subpixel P3, and the fourth subpixel P4 may be disposed on the passivation layer 40. Figure 2 As shown, the second sub-pixel P2 may not have a color filter. In this case, the second sub-pixel P2 may be a sub-pixel emitting white light. If the first sub-pixel P1, the third sub-pixel P3, and the fourth sub-pixel P4 emit light of a specific color, the first sub-pixel P1, the third sub-pixel P3, and the fourth sub-pixel P4 may include a first color filter 71, a third color filter 73, and a fourth color filter 75, respectively. In this way, the first sub-pixel P1, the third sub-pixel P3, and the fourth sub-pixel P4 may include a first color filter 71, a third color filter 73, and a fourth color filter 75 that emit light of different colors. For example, the first color filter 71 may emit red light, the third color filter 73 may emit green light, and the fourth color filter 75 may emit blue light. However, the present disclosure is not limited thereto.

[0062] Each of the first color filter 71, the third color filter 73, and the fourth color filter 75 may overlap at least the emission area EA of a corresponding one of the first subpixel P1, the third subpixel P3, and the fourth subpixel P4. In addition, each of the first color filter 71, the third color filter 73, and the fourth color filter 75 may overlap a portion of the non-emission area NEA of a corresponding one of the first subpixel P1, the third subpixel P3, and the fourth subpixel P4. At least, each of the first color filter 71, the third color filter 73, and the fourth color filter 75 may overlap the reflection area RA among the non-emission area NEA of a corresponding one of the first subpixel P1, the third subpixel P3, and the fourth subpixel P4. In the present disclosure, since the area where light is emitted includes the luminous area EA and the reflective area RA among the non-luminous area NEA, each of the first color filter 71, the third color filter 73 and the fourth color filter 75 can overlap with at least the luminous area EA and the reflective area RA of a corresponding one of the first subpixel P1, the third subpixel P3 and the fourth subpixel P4.

[0063] Each of the first color filter 71, the third color filter 73, and the fourth color filter 75 may overlap a signal line adjacent to a corresponding one of the first subpixel P1, the third subpixel P3, and the fourth subpixel P4. For example, the first color filter 71 may overlap the first line 55a and the second line 55b, the third color filter 73 may overlap the fourth line 55d and the fifth line 55e, and the fourth color filter 75 may overlap the sixth line 55f and the seventh line 55g.

[0064] Reference Figure 2In area B, the third color filter 73 and the fourth color filter 75 corresponding to the third sub-pixel P3 and the fourth sub-pixel P4 positioned adjacent to each other can overlap with each other to form a stacked structure. That is, if the corresponding sub-pixels are sub-pixels that emit colored light instead of white light, the corresponding color filters adjacent to each other can overlap with each other so that one color filter is stacked on another adjacent color filter. If adjacent color filters overlap with each other to form a stacked structure, color mixing between corresponding adjacent sub-pixels can be prevented. That is, in the present disclosure, adjacent color filters overlap with each other to form a stacked structure, so that even if the area between the light-emitting areas of corresponding adjacent sub-pixels is exposed from the embankment, the function of preventing color mixing can be exhibited (for example, the overlapping portion of the color filter can be provided with a type of black matrix to block light).

[0065] The coating layer 50 may be disposed over the entire active region and the inactive region on the substrate 10. The coating layer 50 may cover the color filters 71, 73, and 75, the plurality of lines 55a, 55b, 55c, 55d, 55e, 55f, 55g, 55i, and 55j, the transistor TFT, and the like. The coating layer 50 may be formed to have a thickness sufficient to flatten the surface steps caused by components such as the transistor TFT on the substrate 10. For example, the coating layer 50 is an organic insulating film and may be one of photo acrylic, polyimide, benzocyclobutene resin, and acrylate, and in some cases, the coating layer 50 may be formed as a multilayer structure.

[0066] The first coating layer 51 and the second coating layer 53 may be formed of the same material in the same process. Alternatively, the first coating layer 51 and the second coating layer 53 may be formed of the same material in different processes. In some cases, the first coating layer 51 and the second coating layer 53 may be formed of different materials.

[0067] The coating layer 50 may have at least one concave area CA1. The coating layer 50 according to the first embodiment may include a first coating layer 51 and a second coating layer 53. Therefore, the coating layer 50 including the first coating layer 51 and the second coating layer 53 may include a flat area FA and a first concave area CA1. For example, the concave area CA1 may be formed between adjacent sub-pixels. In addition, a portion of the second electrode 65 may follow the curve of the concave area CA1 to form a reflective area RA. In addition, the cross-section of the reflective area RA may have a "V" shape or a "U" shape between adjacent sub-pixels.

[0068] The flat area FA of the coating layer 50 is an area where the surface of the second coating layer 53 is flat, and a first electrode 61 conductively connected to the thin film transistor TFT is disposed thereon. Figure 2As shown, the first electrode 61 may have an area overlapping a portion of the flat area FA. Figure 7 As shown, the first electrode 61 may have an area overlapping with a portion of the flat area FA, and an area where the first electrode 61 and the flat area FA do not overlap each other may be disposed outside the area where the first electrode 61 and the flat area FA overlap each other. However, the overlapping relationship between the first electrode 61 and the flat area FA is not limited thereto, and in some cases, the first electrode 61 is disposed on the entire flat area FA to completely overlap the flat area FA. The first electrode 61 may be disposed on the flat area FA of the second coating layer 53 so that the flat area FA may overlap with the light emitting area EA.

[0069] The first concave area CA1 of the coating layer 50 may be disposed between adjacent flat areas FA. The first concave area CA1 may be an area that is recessed from the flat area FA of the second coating layer 53 toward the surface 51a of the first coating layer 51. Therefore, in the recessed area of ​​the flat area FA connected to the second coating layer 53, the first concave area CA1 may have a first inclined surface that becomes a side surface of the second coating layer 53. The first concave area CA1 may extend along three or more sides of the corresponding sub-pixel in a plan view. Here, the reflective light emission area may be disposed on the first inclined surface of the first concave area CA1. Here, the reflective light emission area on the first inclined surface of the first concave area CA1 is the inner surface of the first inclined surface of the second electrode 65 facing the first concave area CA1. In this way, the first concave area CA1 may overlap with the non-luminous area NEA, and may overlap with the reflective area RA outside the luminous area EA. The first concave area CA1 described in the present disclosure may be a contact hole CH( Figure 5A different parts.

[0070] Common Reference Figure 2 and Figure 3 The first coating layer 51 may be disposed on the entire surface of the substrate 10 and may make contact with the surface of the passivation layer 40 and the surfaces of the first, third, and fourth color filters 71, 73, and 75. The surface 51a of the first coating layer 51 may be flattened by flattening the steps on the substrate 10.

[0071] The second coating layer 53 may be disposed on the first coating layer 51 to correspond to each of the plurality of sub-pixels P1, P2, P3, and P4. The second coating layer 53 may be formed to protrude from the surface 51a of the first coating layer 51. The second coating layer 53 may be independently disposed in each of the plurality of sub-pixels P1, P2, P3, and P4. Specifically, the second coating layer 53 may include a lower surface 53a in contact with the surface 51a of the first coating layer 51, an upper surface 53c opposite to the lower surface 53a, and a side surface 53b connecting the lower surface 53a and the upper surface 53c.

[0072] The lower surface 53a of the second coating layer 53 may overlap with the emission area EA of each sub-pixel and the reflection area RA located outside the emission area EA. The upper surface 53c of the second coating layer 53 may overlap with the emission area EA of each sub-pixel. Therefore, the side surface 53b between the upper surface 53c and the lower surface 53a of the second coating layer 53 may overlap with at least a portion of the reflection area RA of each sub-pixel.

[0073] The upper surface 53c of the second coating layer 53 may be the flat area FA of the coating layer 50. The upper surface 53c of the second coating layer 53 may also overlap a portion of the reflective area RA in addition to the emission area EA of each sub-pixel. The reflective area RA partially overlapping the upper surface 53c of the second coating layer 53 may include a third reflective area RA3.

[0074] The side surface 53b of the second coating layer 53 may overlap the first reflection area RA1 and the second reflection area RA2 of each sub-pixel. In addition, the side surface 53b of the second coating layer 53 may include a first side surface portion S1 and a second side surface portion S2 located outside the first side surface portion S1. The first side surface portion S1 of the second coating layer 53 may be positioned adjacent to the upper surface 53c, and the second side surface portion S2 may be positioned adjacent to the lower surface 53a. Here, the side surfaces 53b in the first side surface portion S1 and the second side surface portion S2 of the second coating layer 53 may be formed to have different shapes, respectively.

[0075] The first side surface portion S1 of the second coating layer 53 may be formed as a curve or have a curved portion (e.g., a curved slope). Specifically, the first side surface portion S1 of the second coating layer 53 may be formed as a parabola. The parabolic first side surface portion S2 of the second coating layer 53 may correspond to the shape of the second electrode 65 in the first reflection area RA1 formed according to a predetermined parabolic equation. In other words, the parabolic first side surface portion S2 of the second coating layer 53 may serve as a basis for forming a parabolic shape of the second electrode 65 to extract an optical waveguide mode in the forward direction of the substrate 10.

[0076] The second side surface portion S2 of the second coating layer 53 may be formed as a straight line or a straight slope. The straight second side surface portion S2 of the second coating layer 53 may serve as a basis for forming a straight line shape of the second electrode 65 overlapping the second reflective area RA2.

[0077] The second side surface portion S2 of the second coating layer 53 may be formed at a first angle θ with respect to the lower surface 53a of the second coating layer 53. Since the side surface 53b of the second coating layer 53 becomes parabolic as it approaches the upper surface 53c, the angle formed by the first side surface portion S1 of the second coating layer 53 and the lower surface 53a of the second coating layer 53 may be smaller than the first angle θ. Here, considering the light distribution characteristics of the optical waveguide mode to be described below, the first angle θ may be between 45° and 75°.

[0078] In addition, as the vertical distance h1 between the upper surface 53c and the lower surface 53a of the second coating layer 53 increases, the straight area or the straight slope area can increase. Due to the characteristics of the parabola, as the vertical distance h1 increases, the straight line segment can increase. Due to the properties of the parabola, the origin o( Figure 4B The area adjacent to the vertical distance h1 forms a curved surface, but the straight line segment may increase as the distance from the origin o increases. Therefore, the increase in the vertical distance h1 may result in an increase in the second side surface portion S2 having a straight slope. In addition, since the increase in the vertical distance h1 results in an increase in the straight line segment, the viewing angle extraction area increases, and the non-luminous area NEA increases compared to the luminous area EA, which may shorten the life of the luminous display device. In order to prevent this problem, the vertical distance h1 may be set to be equal to or less than an appropriate value. For example, the vertical distance h1 may be set to be equal to or less than 3.5 μm.

[0079] The light-emitting display device according to the present disclosure may determine the shape of the layers included in the light-emitting element 60 deposited on the second coating layer 53 according to the shapes of the upper surface 53c and the side surface 53b of the second coating layer 53. The light-emitting element 60 including the first electrode 61, the intermediate layer 63, and the second electrode 65 may be disposed on the coating layer 50. The layers included in the light-emitting element 60 may be formed of a very thin organic film or metal with good step coverage, and may be deposited along the surface shape of the coating layer 50. Here, the light-emitting element 60 may be a commonly used organic light-emitting diode.

[0080] The first electrode 61 may be disposed to correspond to each of the plurality of sub-pixels P1, P2, P3, and P4, and may be disposed on the upper surface 53c of the second coating layer 53. The first electrode 61 may be spaced apart from at least one concave region of the coating layer 50. Therefore, the first electrode 61 according to the first embodiment may be spaced apart from the first concave region CA1. Specifically, the first electrode 61 may be disposed to completely overlap with the upper surface 53c of the second coating layer 53, or may be disposed to overlap with a portion of the upper surface 53c of the second coating layer 53. If the first electrode 61 overlaps with a portion of the upper surface 53c of the second coating layer 53, the first electrode 61 may be disposed to expose the edge of the upper surface 53c of the second coating layer 53 (for example, according to the embodiment, the first electrode 61 may not overlap with the outer edge of the upper surface 53c of the second coating layer 53). From a process perspective, the first electrode 61 is disposed to not overlap with the edge of the upper surface 53c of the second coating layer 53 to form a certain free space (or margin) to form the first electrode 61 in the flat area FA. In addition, from an optical point of view, the first electrode 61 is set to not overlap with the edge of the upper surface 53c of the second coating layer 53, which can be the following optical condition: light emitted from the end 61a is reflected by the inner surface of the second electrode 65 along the optical waveguide path in the first electrode 61 to extract light toward the front surface of the substrate 10.

[0081] The end 61a of the first electrode 61 may become thinner as it approaches the substrate 10 (for example, the end 61a of the first electrode 61 may taper to a point or have an inclined edge). Therefore, the intermediate layer 63 of the organic material deposited on the first electrode 61 may be stably deposited on the inclined end 61a compared to the vertical end. In the case of the light waveguide mode, the shape of the end 61a of the first electrode 61 may not directly affect the effect that the light in the light waveguide mode emitted from the end 61a is reflected by the first reflective area RA1 toward the front surface of the substrate 10.

[0082] In addition, the light-emitting display device according to the present disclosure may be formed as a bottom emission type in which light emitted from the intermediate layer 63 is emitted toward the substrate 10 on which the transistor TFT is disposed. Therefore, the first electrode 61 may be formed as a conductive layer formed of a transparent material. For example, the first electrode 61 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0083] The intermediate layer 63 on the first electrode 61 may be disposed over the entire area of ​​the substrate 10 (e.g., laid as a common layer). In the present disclosure, the intermediate layer 63 may include an organic material and may be a common organic light-emitting layer. Specifically, the intermediate layer 63 may refer to an organic layer of a single stack including a plurality of layers, the plurality of layers including a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL). In some cases, the intermediate layer 63 may have the following cascade structure: it includes a plurality of stacks (i.e., a first stack and a second stack), each stack including a light-emitting layer and a charge generation layer CGL between the stacks. In addition, the cascade structure of the intermediate layer 63 is not limited to a structure of two stacks, but may also include a plurality of stacks, i.e., more than three stacks.

[0084] In a plurality of stacks, each light-emitting layer may be a light-emitting layer that emits light of the same color (i.e., any one of red light, green light, and blue light), and may be provided in each of some of the plurality of sub-pixels P1, P2, P3, and P4. The other layers included in the intermediate layer 63 except the light-emitting layer may be provided over the entire surface of the substrate 10 through a common mask. Alternatively, when white light is emitted by the light-emitting layer in a double stack structure or a multi-layer stack structure including three or more stacks, each light-emitting layer may be provided over the entire surface of the substrate 10 through a common mask in the same manner as the other layers included in the intermediate layer 63.

[0085] The charge generation layer may be formed in a double-layer structure including an n-type charge generation layer and a p-type charge generation layer. The n-type charge generation layer and the p-type charge generation layer of the charge generation layer may include an n-type dopant and a p-type dopant, respectively.

[0086] The second electrode 65 on the intermediate layer 63 can be arranged on the entire surface of the substrate 10 by a common mask. The second electrode 65 can be laid as a common layer, for example, laid as a common layer. The second electrode 65 can be formed to have a higher reflection efficiency than the first electrode 61 to reflect the light generated from the intermediate layer 63. For example, the second electrode 65 can be formed into a multilayer structure, which includes a transparent conductive film and an opaque conductive film with high reflection efficiency. The transparent conductive film of the second electrode 65 can be formed of a material having a relatively high work function value, such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the opaque conductive film can be formed into a single layer or multilayer structure including at least one selected from the group consisting of: silver (Ag), aluminum (Al), copper (Cu), molybdenum (Mo), titanium (Ti), nickel (Ni), chromium (Cr), tungsten (W) and alloys thereof. For example, the second electrode 65 can be formed into a structure in which a transparent conductive film, an opaque conductive film and a transparent conductive film are sequentially stacked, or a structure in which a transparent conductive film and an opaque conductive film are sequentially stacked.

[0087] The second electrode 65 may be disposed along the shape of the upper surface 53c and the side surface 53b of the second coating layer 53 and the surface 51a of the first coating layer 51. The second electrode 65 may be positioned along the side surface 53b of the second coating layer 53 in the reflection area RA to surround the end 61a of the first electrode 61. Therefore, the second electrode 65 disposed in the reflection area RA may reflect light traveling laterally among the light generated from the light emitting area EA toward the substrate 10.

[0088] In the present disclosure, the second electrode 65 may be formed along the surface shape of the coating layer 50, but due to the thickness of the intermediate layer 63 disposed between the coating layer 50 and the second electrode 65, the parabolic region of the second electrode 65 may be offset outward from the parabolic region of the coating layer 50 by the thickness of the intermediate layer 63. That is, the first reflection region RA1 representing the parabolic region of the second electrode 65 may not completely overlap with the first side surface portion S1 of the coating layer 50, and the first reflection region RA1 may be offset outward from the first side surface portion S1 while overlapping a portion of the first side surface portion S1.

[0089] In the following, reference will be made to Fig.10 Describe in detail the light distribution in the optical waveguide mode. Fig.10 In the graph shown, the horizontal axis represents the angle at which the optical waveguide mode advances relative to the substrate 10, and the vertical axis represents the light intensity of the optical waveguide mode. Fig.10, the optical waveguide mode can advance toward the front surface and the side surface of the substrate 10, based on the angle of light traveling perpendicular to the substrate 10 being 0°, and the angle of light traveling parallel to the substrate 10 can be defined as 90°. In addition, in the optical waveguide mode, assuming that the intensity of light traveling at an angle of 0° (i.e., in the forward direction of the substrate 10) is set to 1, the intensity of light traveling at other angles is expressed relative to it. Specifically, the optical waveguide mode can have a light intensity of less than 1 at an angle between 0° and 45°, and can have a light intensity of more than 2 at an angle between 45° and 90°. Specifically, the optical waveguide mode can have a light intensity of 2 at an angle of about 75°, which exhibits the best efficiency. Observation Fig.10 In the area surrounded by the horizontal axis and the vertical axis, the light intensity in the angle range from 0° to 45° can account for about 35% of the total light intensity in the optical waveguide mode, and the light intensity in the angle range from 45° to 90° can account for about 65% of the total light intensity in the optical waveguide mode. Therefore, it can be seen that the optical waveguide mode mainly advances at an angle above 45°. Specifically, it can be seen that the optical waveguide mode mainly advances at an angle from 75° to 90°.

[0090] Therefore, the present disclosure may be provided with the second electrode 65 to extract light in the optical waveguide mode toward the substrate 10 in the angle region of 75° to 90° in which the efficiency of the optical waveguide mode is the highest.

[0091] Reference Figure 4A The second electrode 65 is formed as a parabola satisfying the following equation 1 at least in the first reflection area RA1, so that the light in the optical waveguide mode among the light generated from the light emitting area EA and traveling laterally can be reflected in the forward direction L11 of the substrate 10. That is, referring to Figure 4A , an optical waveguide mode emitted from one focus (0, −a) of the end 61a of the first electrode 61 may travel in a forward direction L11 of the substrate 10 perpendicular to the substrate 10 through the second electrode 65 corresponding to the first reflection area RA1.

[0092] Equation 1: -x 2 =4ay (a is a constant greater than 0)

[0093] Common Reference Figure 4B , Equation 1 may satisfy the following conditions: the focus has coordinates (0, -a) at the end 61a of the first electrode 61, y=a is a directrix, and a is a constant greater than 0. Here, the x-axis may be parallel to the first electrode 61. In addition, the end 61a of the first electrode 61 may be an emission point of the optical waveguide mode light, and the emission point of the optical waveguide mode may represent the focus (0, -a) of the parabola equation of Equation 1. Figure 4B The r1 and r2 shown are Fig.10The points where the light in the optical waveguide mode traveling in the 90° direction and the light in the optical waveguide mode traveling in the 75° direction respectively intersect with the parabola following Equation 1. The parabolic region between r1 and r2 may have the effect of extracting the optical waveguide mode in the forward direction of the substrate 10, which is a direction perpendicular to the substrate 10. That is, the second electrode 65 disposed in the first reflective region RA1 of the present disclosure may have the same Figure 4B Therefore, in the present disclosure, by providing the second electrode 65 in the first reflective area RA1 to surround the end 61a of the first electrode 61, the light waveguide mode emitted from the end 61a of the first electrode 61 is extracted in the forward direction of the substrate 10, thereby further improving the forward light extraction efficiency of the light-emitting display device.

[0094] The area of ​​the second electrode 65 corresponding to the second reflection area RA2 may reflect the light waveguide mode in the lateral direction L12 of the substrate 10. According to equation 1 of the parabola of the second electrode 65 overlapping the first reflection area RA1, the straight area of ​​the second electrode 65 overlapping the second reflection area RA2 of the second electrode 65 may be a straight line segment of the parabola extending toward the second reflection area RA2. In some cases, the second side surface portion S2 of the second coating layer 53 may be formed as a straight line that does not follow equation 1 of the parabola of the first side surface portion S1. In the present disclosure, as an example, the area of ​​the second electrode 65 in the second reflection area RA2 is described as a straight line segment following equation 1.

[0095] Since the area of ​​the second electrode 65 corresponding to the second reflective area RA2 is formed along the shape of the side surface 53b of the second coating layer 53, the angle of the straight area of ​​the second electrode 65 and the substrate 10 may be the first angle θ. The first angle θ may satisfy Equation 2 below.

[0096] Equation 2: θ = (180 - α) / 2

[0097] Here, α can be expressed as Fig.10 In the present disclosure, the optical waveguide mode has the best efficiency at an angle of 75° to 90°, and by substituting these angles into α, the optimal condition of the first angle θ can be derived. In Equation 2, by substituting 75° and 90° into α, respectively, the optimal condition of the first angle θ can be in the range of 45° to 52.5°. In addition, referring to Fig.10, if the advancing angle of the optical waveguide mode with the maximum efficiency is about 75°, the first angle θ may be 52.5°. That is, when the angle between the area corresponding to the second reflection area RA2 in the second electrode 65 and the substrate 10 is in the range of 45° to 52.5°, the light-emitting display device of the present disclosure may extract the optical waveguide mode with the highest efficiency in the forward direction of the substrate 10. In addition, when the angle between the area corresponding to the second reflection area RA2 in the second electrode 65 and the substrate 10 is 52.5°, the light-emitting display device of the present disclosure may achieve the maximum efficiency of extracting the optical waveguide mode in the forward direction of the substrate 10. However, the first angle θ of the present disclosure is not limited thereto, and may be less than 45° or greater than 52.5° to extract light in the optical waveguide mode.

[0098] The area of ​​the second electrode 65 corresponding to the third reflection area RA3 may guide the light waveguide mode toward the front surface of the substrate 10. The area of ​​the second electrode 65 corresponding to the third reflection area RA3 may be located above the first electrode 61. When light, which is a component of the light waveguide mode emitted from the first electrode 61, is reflected by the area of ​​the second electrode 65 in the third reflection area RA3, the light may be reflected at half the light exit angle and reach the area of ​​the second electrode 65 corresponding to the first reflection area RA1 or the second reflection area RA2. As a result, the light, which is a component of the light waveguide mode reflected by the area of ​​the second electrode 65 in the third reflection area RA3, may be reflected again by the area of ​​the second electrode 65 corresponding to the first reflection area RA1 or the second reflection area RA2, and may be emitted in the forward direction of the substrate 10. Therefore, the area of ​​the second electrode 65 in the third reflection area RA3 may indirectly reflect and extract, toward the substrate 10, light traveling in an upward direction opposite to the front surface of the substrate 10 among the light generated from the light emitting area EA.

[0099] As such, the light emitting display device of the present disclosure is configured such that the second electrode 65 surrounds the end portion 61a of the first electrode 61, and the light waveguide mode emitted from the end portion 61a of the first electrode 61 can be released toward the substrate 10. In particular, since the parabolic region of the second electrode 65 corresponding to the first reflective region RA1 and satisfying Equation 1 can be formed in the forward direction L11 ( Figure 4A In the embodiment of the present invention, the light emitting display device can significantly improve the forward light extraction efficiency and make each sub-pixel brighter. In addition, since the straight line area of ​​the second electrode 65 corresponding to the second reflective area RA2 can be in the lateral direction L12 ( Figure 4AThe reflective light waveguide mode is reflected on the surface of the light emitting display device according to the present disclosure, so the light emitting display device according to the present disclosure can have the effect of improving the viewing angle. (For example, the sub-pixels can be made brighter, but also provide a wider viewing angle, save space and reduce power consumption). For example, the sub-pixels can be packed more closely together and a higher resolution can be provided.

[0100] Reference Figure 5A and Figure 5B , the bank 67 or 167 of the present disclosure may be provided to cover the contact hole CH formed in the coating layer 50. That is, the bank 67 or 167 of the present disclosure may be provided above the thin film transistor TFT provided with the contact hole CH at the end of the first electrode 61.

[0101] The thin film transistor TFT of the present disclosure includes an active layer, a gate electrode 43 overlapping the channel region of the active layer 37 by interposing a gate insulating film 41 therebetween, and a source electrode 45b and a drain electrode 45a connected to both sides of the active layer 37.

[0102] The active layer 37 of the thin film transistor TFT may have a source region and a drain region on both sides thereof with a channel region interposed therebetween. Each of the source region and the drain region is formed of a semiconductor material implanted with n-type or p-type impurities.

[0103] The gate electrode 43 of the thin film transistor TFT may be set to have the same width as the channel region of the active layer 37 to overlap with the channel region of the active layer 37, and the gate insulating film 41 is interposed between the gate electrode 43 and the channel region of the active layer 37. The gate insulating film 41 overlaps the channel region of the active layer 37 in the same pattern as the gate electrode 43. For example, the gate electrode 43 may be a single-layer or multi-layer structure formed of at least one selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys. The gate insulating film 41 may be formed of an inorganic insulating material, for example, silicon oxide (SiO x ) film, silicon nitride (SiN x ) film, silicon oxynitride (SiO x N y ) film or a multilayer film thereof.

[0104] The light shielding layer 21 on the substrate 10 is disposed below the active layer 37 to overlap at least the channel region of the active layer 37 of the thin film transistor TFT. The light shielding layer 21 prevents external light from penetrating the substrate 10 and transmitting to the thin film transistor TFT. For example, the light shielding layer 21 may be formed as a single layer of a metal material such as molybdenum (Mo), titanium (Ti), aluminum neodymium (AlNd), aluminum (Al), chromium (Cr), or an alloy thereof, or a multilayer structure thereof.

[0105] Reference Figure 5A According to one embodiment, the bank 67 may be disposed on the overcoat layer 50 to fill the contact hole CH and cover the thin film transistor region TA in which the thin film transistor TFT is disposed. Figure 1 Therefore, in the present disclosure, the bank 67 covers the contact hole CH and the thin film transistor TFT, and the intermediate layer 63 is not provided on the first electrode 61, so that light emission in the region where the contact hole CH and the thin film transistor TFT are provided can be prevented. In this case, the bank 67 can be formed of an organic insulating film. For example, the bank 67 according to one embodiment can be formed of any one of photo acrylic, polyimide, benzocyclobutene resin, and acrylate.

[0106] Reference Figure 5B , the bank 167 according to another embodiment may be provided on a region of the first electrode 61 corresponding to the contact hole CH, a region of the first electrode 61 adjacent to the contact hole CH, and an end of the first electrode 61. In this way, the present disclosure may be applied to the liner-type bank 167 to provide the bank 167 in a minimum area. In this case, the bank 167 may be formed of an inorganic insulating film so that the bank can be easily formed thinly. For example, the bank 167 according to another embodiment may be formed of silicon oxide (SiO x ) film, silicon nitride (SiN x ) film and silicon oxynitride (SiO x N y ) film is formed.

[0107] In addition, a protective film and an encapsulation layer may be further provided on the bank 67 or 167 and the light-emitting element 60. The protective film may include a covering layer containing an organic insulating material to improve the optical properties of the second electrode 65 and protect the second electrode 65 and / or an inorganic protective film containing an inorganic insulating material. The encapsulation layer may be provided in the form of a stack of one or more pairs of organic encapsulation layers and inorganic encapsulation layers to cover the entire active area and the inactive area on the substrate 10. The encapsulation layer may prevent oxygen and moisture from penetrating into the light-emitting element, thereby being able to increase the life of the light-emitting display device. Here, the encapsulation layer may be formed as an encapsulation substrate, and the encapsulation substrate and the substrate 10 provided with the thin film transistor TFT may be bonded to each other by interposing an adhesive layer having adhesive properties therebetween, or may be bonded to each other by a sealant applied to the edges of the encapsulation substrate and the substrate 10 in a state where the encapsulation substrate and the substrate 10 face each other.

[0108] Next, Figures 6 to 9B is a diagram showing a light emitting display device according to a second embodiment. Figure 6 is a plan view of a light emitting display device according to an embodiment. Figure 7 is along Figure 6 A cross-sectional view taken along line III-III′. Figure 8 According to the embodiments of the present disclosure Figure 7 An enlarged view of area A2. Fig.9A is a diagram showing a light waveguide path of a light emitting display device according to an embodiment of the present disclosure. Fig. 9B is a diagram plotting a parabolic region of a second electrode according to an embodiment of the present disclosure in a coordinate system. Hereinafter, a light emitting display device according to a second embodiment will be described while omitting description of the same components as those of the previous embodiment.

[0109] Reference Figure 6, the light-emitting display device of the present disclosure according to the second embodiment may have a light-emitting area EA wider than the flat area FA (for example, a portion of the light-emitting area EA may extend along the inclined area). In addition, the third reflection area RA3, the first reflection area RA1, and the second reflection area RA2 may be sequentially arranged outside the light-emitting area EA. The third reflection area RA3 may be arranged outside the light-emitting area EA along the edge of the light-emitting area EA. The first reflection area RA1 may be arranged outside the third reflection area RA3, and may not be arranged outside the area of ​​the first electrode 161 where the thin film transistor area TA is arranged. The second reflection area RA2 may be arranged outside the first reflection area RA1, and may not be arranged outside the area of ​​the first electrode 161 where the thin film transistor area TA is arranged. The first reflection area RA1 and the second reflection area RA2 are components for light extraction, and may not be arranged in the thin film transistor area TA, which may be an area where light is not extracted in some cases. However, the present disclosure is not limited thereto, and the first reflection area RA1 and the second reflection area RA2 may be arranged along all edge areas of the first electrode 161. In addition, the second reflection area RA2 located at the outermost position among the first to third reflection areas RA1, RA2 and RA3 may partially overlap with at least two lines (or wirings) among the first to seventh lines 55a, 55b, 55c, 55d, 55e, 55f and 55g arranged in one direction.

[0110] Reference Figure 7 , the light-emitting display device of the present disclosure according to the second embodiment may have a coating layer 150 including a first coating layer 151, a second coating layer 153, and a third coating layer 155. That is, the coating layer 150 according to the second embodiment may further include a third coating layer 155 protruding corresponding to a specific area on the second coating layer 53 of the coating layer 50 according to the first embodiment. For example, the third coating layer 155 may provide a ridge or a convex portion (e.g., a type of a double ridge structure or a double ridge structure) disposed on opposite sides of the first concave area CA1.

[0111] The coating layer 150 may be disposed on the entire active area and the inactive area on the substrate 10. The coating layer 150 may cover the color filters 71, 73 and 75, the plurality of lines 55a, 55b, 55c, 55d, 55e, 55f, 55g, 55i and 55j ( Figure 6 ), transistor TFT ( Figure 6 The coating layer 150 may be formed to have a thickness sufficient to flatten or planarize a surface step caused by components such as a transistor TFT on the substrate 10 .

[0112] The first to third coating layers 151, 153, and 155 can be formed of the same material in the same process. Alternatively, the first to third coating layers 151, 153, and 155 can be formed of the same material in different processes. In some cases, the first to third coating layers 151, 153, and 155 can be formed of different materials.

[0113] The coating layer 150 may have a flat area FA, a first concave area CA1, and a second concave area CA2 located between the flat area FA and the first concave area CA1. Here, the second concave area CA2 may have a second inclined surface extending from the flat area FA. The second inclined surface of the second concave area CA2 and the first inclined surface of the first concave area CA1 may be inclined in different directions and protrude from the first coating layer 151 to form a convex shape. In addition, the first electrode 161 may be disposed on the second inclined surface of the second concave area CA2, and the reflective light emitting area may be disposed on the second inclined surface of the second concave area CA2 that does not overlap with the first electrode 161.

[0114] The flat area FA of the coating layer 150 is an area where the surface of the second coating layer 153 is flat, and a first electrode 161 conductively connected to the thin film transistor TFT is disposed thereon. Figure 7 As shown, the first electrode 161 may have an area completely overlapping with the flat area FA of the second coating layer 153 exposed from the third coating layer 155 , and overlap with a portion of the second concave area CA2 .

[0115] The first concave area CA1 of the coating layer 150 may be disposed between adjacent flat areas FA. In addition, the second concave area CA2 may be disposed between the first concave area CA1 of the coating layer 150 and the flat area FA adjacent thereto. The first concave area CA1 and the second concave area CA2 described in the present disclosure are areas surrounding the light emitting area EA and may be components other than the hole for contact. In addition, the first concave area CA1 and the second concave area CA2 may surround three or more sides of the corresponding sub-pixel in a plan view.

[0116] The first concave area CA1 according to the second embodiment may be an area recessed toward the surface 151a of the first coating layer 151 along the side surface 153b of the second coating layer 153 and the first surface 155b of the third coating layer 155 formed continuously with the side surface 153b. The first concave area CA1 may overlap the non-emission area NEA and may overlap the reflective area RA outside the emission area EA.

[0117] The second concave area CA2 may be an area of ​​the third surface 155c of the third coating layer 155 having an inclination in a different direction from the first surface 155b. A portion of the first electrode 161 extending from the flat area FA may be disposed on the second concave area CA2, and the second concave area CA2 may overlap a portion of the emission area EA.

[0118] Common Reference Figure 8 The first coating layer 151 may be disposed on the entire surface of the substrate 10 and may contact the surface of the passivation layer 40 and the surfaces of the first, third, and fourth color filters 71, 73, and 75. By flattening the steps on the substrate 10, the surface 151a of the first coating layer 151 may be flattened.

[0119] The second coating layer 153 may be disposed on the first coating layer 151 to correspond to each of the plurality of sub-pixels P1, P2, P3, and P4. The second coating layer 153 may be formed to protrude from the surface 151a of the first coating layer 151. The second coating layer 153 may be independently disposed in each of the plurality of sub-pixels P1, P2, P3, and P4. Specifically, the second coating layer 153 may include a lower surface 153a in contact with the surface 151a of the first coating layer 151, an upper surface 153c opposite to the lower surface 153a, and a side surface 153b configured to connect the lower surface 153a and the upper surface 153c. Here, the side surface 153b of the second coating layer 153 may overlap at least with the second reflective area RA2.

[0120] The upper surface 153c of the second coating layer 153 may partially overlap with the flat area FA of the coating layer 150. For example, the flat area FA may overlap with the central portion of the upper surface 153c of the second coating layer 153. The third coating layer 155 may be disposed on the upper surface 153c that does not overlap with the flat area FA of the second coating layer 153. In addition to the light emitting area EA of each sub-pixel, the upper surface 153c of the second coating layer 153 may also overlap with a portion of the reflective area RA. The reflective area RA partially overlapping with the upper surface 153c of the second coating layer 153 may include a first reflective area RA1 and a third reflective area RA3.

[0121] The side surface 153b of the second coating layer 153 may overlap at least the second reflective area RA2. The side surface 153b of the second coating layer 153 may be disposed between the surface 151a of the first coating layer 151 and the first surface 155b of the third coating layer 155. In addition, the side surface 153b of the second coating layer 153 may form a first angle θ with the lower surface 153a. Fig.9A and Fig. 9B The first angle θ is described in detail in .

[0122] The third coating layer 155 may be disposed on the upper surface 153c of the second coating layer 153. The third coating layer 155 may be disposed along the edge of the upper surface 153c of the second coating layer 153, and the flat area FA may be disposed in the area where the third coating layer 155 is disposed. In addition, the third coating layer 155 may be disposed between the first electrode 161 and the second coating layer 153, and the first electrode 161 is disposed on a portion of the inner surface of the third coating layer 155. The third coating layer 155 may have a first surface 155b and a third surface 155c serving as two side surfaces, and a second surface 155a serving as a lower surface between the two side surfaces.

[0123] The second surface 155a of the third coating layer 155 may contact the upper surface 153c of the second coating layer 153. The second surface 155a of the third coating layer 155 may have a region overlapping the emission area EA and a region overlapping the non-emission area NEA.

[0124] The first surface 155b of the third coating layer 155 may be connected to the side surface 153b of the second coating layer 153. The first surface 155b of the third coating layer 155 may overlap the first reflective area RA1.

[0125] The third surface 155c of the third coating layer 155 may contact the lower portion of the edge of the first electrode 161, and may have an inclination of the second angle φ relative to the second surface 155a. The second angle φ may be set in consideration of the bending degree of the first electrode 161 from the flat area to the second concave area CA. The optical waveguide mode advancing in the first electrode 161 may advance to the end 161a of the first electrode 161 along the inside of the first electrode 161 in the flat area FA having a relatively large area. At this time, the optical waveguide mode in the first electrode 161 in the flat area FA may advance in a direction parallel to the flat area FA, and in this case, when the edge of the first electrode 161 is sharply bent, the light traveling in the direction parallel to the flat area FA may not reach the end 161a of the first electrode 161, but may directly advance to the coating layer 155. Therefore, considering the characteristics of the optical waveguide mode, the second angle φ may be set in the range of 15° to 35° to control the bending degree of the first electrode 161.

[0126] The inner surface of the coating layer 150 including both the side surface 153b of the second coating layer 153 and the first surface 155b of the third coating layer 155 in the first concave area CA1 may include a first side surface portion S1 and a second side surface portion S2. The inner surface of the coating layer 150 in the first side surface portion S1 and the inner surface of the coating layer 150 in the second side surface portion S2 may be formed to have different shapes.

[0127] The inner surface of the coating layer 150 in the second side surface portion S2 may be formed into a corresponding shape so that the second electrode 165 forms a shape capable of reflecting the optical waveguide mode in the lateral direction of the substrate 10. The inner surface of the coating layer 150 in the second side surface portion S2 may be formed into a straight line. In addition, the inner surface of the coating layer 150 in the second side surface portion S2 may form a first angle θ with the lower surface 153a of the second coating layer 153. Here, considering the light distribution characteristics of the optical waveguide mode to be described below, the first angle θ may be between 27.5° and 35°.

[0128] In addition, as the vertical distance h2 between the upper surface 153c and the lower surface 153a of the second coating layer 153 increases, the straight line area may increase. Due to the characteristics of the parabola, as the vertical distance h2 increases, the straight line segment or the straight slope portion may increase. In addition, since the increase in the vertical distance h2 causes the straight line segment to increase, the viewing angle extraction area increases, and the non-luminous area NEA increases compared to the luminous area EA, which may shorten the life of the luminous display device. Therefore, in order to prevent this problem, the vertical distance h2 can be set to an appropriate value or less. For example, the vertical distance h2 can be set to 1 μm or less.

[0129] The light-emitting display device according to the present disclosure may determine the shape of the layers included in the light-emitting element 160 deposited on the coating layer 150 according to the shapes of the side surface 153b of the second coating layer 153 and the first surface 155b of the third coating layer 155. The light-emitting element 160 including the first electrode 161, the intermediate layer 163, and the second electrode 165 may be disposed on the coating layer 150. The layers included in the light-emitting element 160 may be formed of a metal or a very thin organic film having good step coverage, and may be deposited along the surface shape of the coating layer 150.

[0130] The first electrode 161 may be disposed in each of the plurality of sub-pixels P1, P2, P3, and P4, and may be disposed on the upper surface 153c of the second coating layer 153 and the third surface 155c of the third coating layer 155. The first electrode 161 may be disposed on a portion of the third surface 155c of the third coating layer 155 along the upper surface 153c of the second coating layer 153 exposed by the third coating layer 155. Disposing the first electrode 161 to expose the upper portion of the third surface 155c of the third coating layer 155 may provide a basis for forming the second electrode 165 along the first surface 155b of the third coating layer 155 while minimizing the portion of the first electrode 161 that is bent upward. In addition, from an optical point of view, disposing the first electrode 161 to expose the upper portion of the third surface 155c of the third coating layer 155 may be an optical condition in which light emitted from the end portion 161a is reflected by the inner surface of the second electrode 165 along the optical waveguide path in the first electrode 161 to extract light toward the front surface of the substrate 10.

[0131] Here, when the light traveling in the first electrode 161 in the flat area FA is bent in the second concave area CA2, the traveling direction of the light changes, and the light may have difficulty reaching the end 161a of the first electrode 161, resulting in difficulty in emitting the light waveguide mode. Therefore, in the present disclosure, in order to emit light in the light waveguide mode from the end 161a of the first electrode 161, the upward bent portion of the first electrode 161 can be minimized. In a conventional light-emitting display device, the upward bent portion of the first electrode 161 according to the present disclosure (i.e., the region in the first electrode 161 that contacts the third surface 155c of the third coating layer 55) may have a length d of about 2 μm.

[0132] The second electrode 165 on the intermediate layer 163 may be formed on the entire surface of the substrate 10 through a common mask (eg, laid as a common layer). The second electrode 165 may be formed to have higher reflection efficiency than the first electrode 161 to reflect light generated from the intermediate layer 163 .

[0133] The second electrode 165 may be disposed along the surface shape of the coating layer 150. The second electrode 165 may be positioned along the side surface 153b of the second coating layer 153 and the first surface 155b of the third coating layer 155 in the reflection area RA to surround the end 161a of the first electrode 161. Therefore, the second electrode 165 disposed in the reflection area RA may reflect light traveling laterally among the light generated from the light emitting area EA toward the substrate 10.

[0134] As mentioned above Fig.10As described above, the optical waveguide mode may have a light intensity of 1 or less at an angle between 0° and 45°, and may have a light intensity of 2 or more at an angle between 45° and 90°. From this, it can be seen that the optical waveguide mode mainly advances at an angle from 75° to 90°. Specifically, the optical waveguide mode may have a light intensity of 2 at an angle of about 75°, which exhibits the best efficiency.

[0135] Compared with the first embodiment, the direction of emitting the optical waveguide mode from the first electrode 161 according to the second embodiment may be raised upward by the second angle φ. That is, the angle range with the best efficiency in the light distribution of the optical waveguide mode may be "75°+φ" to "90°+φ". Therefore, the present disclosure may have the following second electrode 165, which is configured to extract light in the optical waveguide mode in the "75°+φ" to "90°+φ" region where the optical waveguide mode efficiency is best to the substrate 10.

[0136] Reference Fig.9A The second electrode 165 is formed as a parabola satisfying the following equation 1 at least in the first reflection area RA1, so that it is possible to reflect light in the optical waveguide mode among the light generated from the light emitting area EA and traveling laterally in the forward direction L21 of the substrate 10. That is, referring to Fig.9A , an optical waveguide mode emitted from one focus (0, −a) of the end 161a of the first electrode 161 may advance in a forward direction L21 of the substrate 10 perpendicular to the substrate 10 through the second electrode 165 corresponding to the first reflection area RA1.

[0137] Equation 1: -x 2 =4ay (a is a constant greater than 0)

[0138] Common Reference Fig. 9B , Equation 1 may satisfy the following condition: the focus has coordinates (0, -a) at the end 161a of the first electrode 161, y=a is a directrix, and a is a constant greater than 0. Here, the x-axis may be parallel to the first electrode 161. In addition, the end 61a of the first electrode 61 may be an emission point of an optical waveguide mode, and the emission point of the optical waveguide mode may represent a focus (0, -a) of the parabola equation of Equation 1. Here, the focus (0, -a) according to the second embodiment may have different coordinates from the focus (0, -a) according to the first embodiment. Fig. 9B The r1 and r2 shown are Fig.10The point where the light in the optical waveguide mode traveling in the 90° direction and the light in the optical waveguide mode traveling in the 75° direction intersect the parabola following Equation 1. The parabolic region between r1 and r2 may have the effect of extracting the optical waveguide mode in the forward direction of the substrate 10, which is a direction perpendicular to the substrate 10. That is, the second electrode 165 disposed in the first reflective region RA1 of the present disclosure may have the same Fig. 9B Therefore, in the present disclosure, by providing the second electrode 165 in the first reflective area RA1 to surround the end 161a of the first electrode 161, the light waveguide mode emitted from the end 161a of the first electrode 161 is extracted in the forward direction of the substrate 10, thereby further improving the forward light extraction efficiency of the light-emitting display device.

[0139] The area of ​​the second electrode 165 corresponding to the second reflection area RA2 may reflect the light waveguide mode in the lateral direction L22 of the substrate 10. According to Equation 1 of the parabola of the second electrode 165 overlapping the first reflection area RA1, the straight line area of ​​the second electrode 165 overlapping the second reflection area RA2 of the second electrode 165 may be a straight line segment of the parabola extending toward the second reflection area RA2. Since the area of ​​the second electrode 165 corresponding to the second reflection area RA2 is formed along the shape of the side surface 153b of the second coating layer 153, the angle of such a straight line area of ​​the second electrode 165 and the substrate 10 may be a first angle θ. The first angle θ may satisfy the following Equation 3.

[0140] Equation 3: θ={180-(α+φ)} / 2

[0141] Here, considering the second angle φ, α+φ can be expressed as Fig.10The advancing angle of the optical waveguide mode in the equation 3. In the present disclosure, the optical waveguide mode has the best efficiency at an angle of 75° to 90°, and the optimal condition of the first angle θ can be derived by substituting these angles into α and substituting, for example, 35° (which is the optimal angle as the second angle φ) into φ. By substituting 75° and 90° into α and 35° into φ in Equation 3, respectively, the optimal condition of the first angle θ can be in the range of 27.5° to 35°. That is, when the angle between the area of ​​the second electrode 165 corresponding to the second reflection area RA2 and the substrate 10 is in the range of 27.5° to 35°, the light-emitting display device of the present disclosure can extract the optical waveguide mode with the highest efficiency in the forward direction of the substrate 10. In addition, when the angle between the area of ​​the second electrode 165 corresponding to the second reflection area RA2 and the substrate 10 is 35°, the light-emitting display device of the present disclosure can achieve the maximum efficiency of optical waveguide mode extraction in the forward direction of the substrate 10. However, the first angle θ of the present disclosure is not limited thereto, and may be less than 27.5° or greater than 35° to extract light in the optical waveguide mode.

[0142] The area of ​​the second electrode 165 corresponding to the third reflection area RA3 may guide the light waveguide mode in the forward direction of the substrate 10. When light as a light waveguide mode component emitted from the first electrode 161 is reflected by the area of ​​the second electrode 165 in the third reflection area RA3, the light may be reflected at half of the light exit angle and reach the area of ​​the second electrode 165 corresponding to the first reflection area RA1 or the second reflection area RA2. As a result, the light as a light waveguide mode component reflected by the area of ​​the second electrode 165 in the third reflection area RA3 may be reflected again by the area of ​​the second electrode 165 corresponding to the first reflection area RA1 or the second reflection area RA2, and may be emitted in the forward direction of the substrate 10. Therefore, the area of ​​the second electrode 165 in the third reflection area RA3 may be located above the first electrode 161. Therefore, the area of ​​the second electrode 165 in the third reflection area RA3 may indirectly reflect and extract, toward the substrate 10, light traveling in an upward direction opposite to the front surface of the substrate 10 among the light generated from the light emitting area EA.

[0143] In this way, the light emitting display device of the present disclosure is configured such that the second electrode 165 surrounds the end 161a of the first electrode 161 and emits the light waveguide mode emitted from the end 61a of the first electrode 61 toward the substrate 10. Specifically, since the parabolic region of the second electrode 165 corresponding to the first reflective area RA1 and satisfying equation 1 can be Fig.9AIn the embodiment of the present invention, the light emitting display device can significantly improve the forward light extraction efficiency. In addition, since the straight line area of ​​the second electrode 615 corresponding to the second reflective area RA2 can be in the lateral direction L22 ( Fig.9A In the embodiment of the present invention, a reflective light waveguide mode is formed on the surface of the light emitting device, so the light emitting display device according to the present invention can have the effect of improving the viewing angle (for example, the sub-pixels can be brighter and have a wider viewing angle, reduce power consumption, and be more tightly packaged together).

[0144] In addition, the light-emitting display device of the present disclosure according to the second embodiment has the following structure: it includes a flat area FA, a first concave area CA1, and a second concave area CA2, so that the edge of the first electrode 161 is bent upward toward the second concave area CA2, thereby increasing the light emission angle of the light waveguide mode by the second angle φ, so that the first angle θ can be realized as a low angle compared to the first embodiment. Therefore, the light-emitting display device of the present disclosure according to the second embodiment can realize a relatively low-angle conical structure. In other words, since the edge of the first electrode 161 is slightly bent upward, the waveguide mode can provide a better emission angle for the light leaving the first electrode 161, and the light can be incident on the parabolic portion of the second electrode 165 at an optimal angle to be optimally guided out of the device and toward the user's eyes.

[0145] In addition, the light-emitting display device disclosed in the present invention minimizes the embankment corresponding to the contact hole of the thin film transistor and the first electrode, thereby reducing the non-opening portion compared to the conventional structure having the embankment disposed on the edge of the first electrode, thereby improving the life of the light-emitting display device.

[0146] According to one embodiment of the present disclosure, a light-emitting display device may include: a substrate including a plurality of sub-pixels; a first coating layer located on the entire surface of the substrate; a second coating layer located on the first coating layer, the second coating layer having a side surface overlapping with a reflective region of each of the plurality of sub-pixels; a first electrode located on an upper surface of the second coating layer at a light-emitting region of each of the plurality of sub-pixels; an intermediate layer located above the first coating layer, the second coating layer and the first electrode; and a second electrode located above the intermediate layer, the second electrode having a higher reflectivity than the first electrode.

[0147] In a light-emitting display device according to an embodiment of the present disclosure, the reflective region may be located outside the light-emitting region; and the second electrode may be positioned along a side surface of the second coating layer in the reflective region to surround an end of the first electrode.

[0148] In a light-emitting display device according to one embodiment of the present disclosure, the side surface of the second coating layer may include: a first side surface portion, which is adjacent to the upper surface of the second coating layer; and a second side surface portion, which is adjacent to the lower surface of the second coating layer, and the second side surface portion has a different shape from the first side surface portion.

[0149] In the light emitting display device according to one embodiment of the present disclosure, the first side surface part may include a curved line in a cross-sectional view.

[0150] In the light emitting display device according to one embodiment of the present disclosure, the first side surface part may include a parabola in a cross-sectional view.

[0151] In the light emitting display device according to one embodiment of the present disclosure, the reflective region may include a first reflective region provided with a region of the second electrode in a parabola shape following the first side surface portion. The parabola may satisfy the following equation: 2 =4ay (a is a constant greater than 0) to have a focus with coordinates (0, -a) at the end of the first electrode and a directrix of y=a; and the x-axis is parallel to the first electrode, and the y-axis passes through the focus with coordinates (0, -a).

[0152] In the light emitting display device according to one embodiment of the present disclosure, the second side surface portion may include a straight line in a cross-sectional view.

[0153] In a light-emitting display device according to one embodiment of the present disclosure, the first angle may be between the second side surface portion of the second coating layer and the lower surface of the second coating layer; and the angle between the first side surface portion of the second coating layer and the lower surface of the second coating layer is smaller than the first angle.

[0154] In the light emitting display device according to one embodiment of the present disclosure, an upper surface of the second coating layer may include a region overlapping the first electrode.

[0155] The light emitting display device according to one embodiment of the present disclosure may further include a third coating layer between the second coating layer and the first electrode.

[0156] In the light emitting display device according to one embodiment of the present disclosure, the third coating layer may include a first surface connected to a side surface of the second coating layer. The second electrode may be located in the reflective region along the first surface of the third coating layer.

[0157] In the light emitting display device according to one embodiment of the present disclosure, the side surface of the second coating layer and the first surface of the third coating layer may have different shapes.

[0158] In the light emitting display device according to one embodiment of the present disclosure, the first surface of the third coating layer may include a curved line in a cross-sectional view.

[0159] In the light emitting display device according to one embodiment of the present disclosure, the first surface of the third coating layer may include a parabola.

[0160] In a light-emitting display device according to an embodiment of the present disclosure, the reflective region may include a first reflective region provided with a region of the second electrode having a parabola shape following the first surface. The parabola may satisfy the following equation: 2 =4ay (a is a constant greater than 0) to have a focus with coordinates (0, -a) at the end of the first electrode and a directrix of y=a; and the x-axis is parallel to the first electrode, and the y-axis passes through the focus with coordinates (0, -a).

[0161] In the light-emitting display device according to one embodiment of the present disclosure, the third coating layer may further include: a second surface contacting an upper surface of the second coating layer; and a third surface contacting a lower portion of an edge of the first electrode and having a second angle with the second surface.

[0162] In the light emitting display device according to one embodiment of the present disclosure, a side surface of the second coating layer may include a straight line in a cross-sectional view.

[0163] In a light-emitting display device according to an embodiment of the present disclosure, the first angle may be between a side surface of the second coating layer and a lower surface of the second coating layer; and an angle between the first surface and the second surface of the third coating layer may be smaller than the first angle.

[0164] In the light emitting display device according to one embodiment of the present disclosure, the end portion of the first electrode may become thinner as the distance from the center of the first electrode increases.

[0165] The light-emitting display device according to one embodiment of the present disclosure may further include: a color filter located between the first coating layer and the substrate at the plurality of sub-pixels. Each color filter may overlap the light-emitting region and the reflective region.

[0166] According to one embodiment of the present disclosure, a light-emitting display device may include: a substrate including a plurality of sub-pixels; a coating layer located on the substrate, the coating layer including a flat area overlapping with a light-emitting area of ​​each of the plurality of sub-pixels, and a first concave area surrounding the flat area and overlapping with a reflective area of ​​each of the plurality of sub-pixels; a first electrode located on the flat area of ​​the coating layer; an intermediate layer located above the coating layer and the first electrode; and a second electrode located above the intermediate layer, the second electrode being positioned along the first concave area of ​​the coating layer to surround an end of the first electrode.

[0167] In the light emitting display device according to one embodiment of the present disclosure, the second electrode may have a higher reflectivity than the first electrode.

[0168] In a light-emitting display device according to one embodiment of the present disclosure, the reflective area may include: a first reflective area overlapping with the first concave area of ​​the coating layer; a second reflective area located outside the first reflective area relative to the flat area of ​​the coating layer; and a third reflective area overlapping with the edge of the flat area of ​​the coating layer.

[0169] In the light emitting display device according to one embodiment of the present disclosure, a region of the second electrode overlapping with the first reflective region and a region of the second electrode overlapping with the second reflective region may have different shapes.

[0170] In the light emitting display device according to one embodiment of the present disclosure, a region of the second electrode overlapping the first reflective region may include a curved line in a cross-sectional view.

[0171] In the light emitting display device according to one embodiment of the present disclosure, a region of the second electrode overlapping the second reflective region may include a straight line in a cross-sectional view.

[0172] In the light emitting display device according to one embodiment of the present disclosure, the first electrode may not overlap with the reflective area.

[0173] In the light emitting display device according to one embodiment of the present disclosure, the coating layer may further include a second concave region located between the planar region and the first concave region to surround the planar region.

[0174] In the light emitting display device according to one embodiment of the present disclosure, the first electrode may have a region overlapping a portion of the second concave region.

[0175] According to one embodiment of the present disclosure, a light-emitting display device may include: a substrate including a plurality of sub-pixels; a thin film transistor located on the substrate; a coating layer located on the entire surface of the substrate and having at least one concave area; a first electrode spaced apart from the at least one concave area on the coating layer to correspond to each of the plurality of sub-pixels; an organic light-emitting layer located above the first electrode; and a second electrode located above the organic light-emitting layer.

[0176] In the light emitting display device according to one embodiment of the present disclosure, a light emitting region may be provided at a location where the first electrode is located, and a reflective light emitting region may be provided at a location where the first electrode is not located.

[0177] In the light emitting display device according to one embodiment of the present disclosure, at least one of the organic light emitting layer and the second electrode may be in direct contact with the coating layer at the reflective light emission region.

[0178] In the light-emitting display device according to one embodiment of the present disclosure, the reflective light emission area may surround at least three surfaces of the light-emitting area.

[0179] In the light-emitting display device according to one embodiment of the present disclosure, the coating layer may have a first concave region, and the reflective light emitting region may be disposed on a first inclined surface of the first concave region.

[0180] The light-emitting display device according to one embodiment of the present disclosure may further include a plurality of wirings along the first direction on the substrate.

[0181] In the light emitting display device according to one embodiment of the present disclosure, at least two of the plurality of wirings may overlap a portion of the reflective light emitting region in the first direction.

[0182] The light-emitting display device according to an embodiment of the present disclosure may further include a bank located above the thin film transistor. The bank may cover the thin film transistor and contact the light-emitting region in the second direction.

[0183] In the light-emitting display device according to one embodiment of the present disclosure, the coating layer may further include a flat surface and a second concave area having a second inclined surface configured to extend from the flat surface. The light-emitting area including the second concave area may be larger than the flat surface and may surround the flat surface.

[0184] In the light emitting display device according to an embodiment of the present disclosure, the reflective light emitting area may include a first reflective area, a second reflective area and a third reflective area. The reflective light emitting area may surround the light emitting area in the order of the third reflective area, the first reflective area and the second reflective area.

[0185] The light-emitting display device according to an embodiment of the present disclosure may further include a plurality of wirings along the first direction on the substrate. The second reflective region may overlap at least two of the plurality of wirings.

[0186] As is apparent from the above description, the light emitting display device of the present disclosure has the following effects.

[0187] First, in the light-emitting display device of the present disclosure, the side surface of the coating layer is formed into a parabola, and therefore, the second electrode formed along the side surface of the coating layer can surround the end of the first electrode in a parabolic shape. Since the second electrode surrounds the end of the first electrode in a parabolic shape, the light-emitting display device of the present disclosure can extract the optical waveguide mode in the forward direction of the substrate, thereby improving the forward light extraction efficiency.

[0188] Second, in the light-emitting display device of the present disclosure, the coating layer has a straight area of ​​the side surface below the parabolic area of ​​the side surface, so the second electrode formed along the side surface of the coating layer may also include a straight area. Therefore, the light-emitting display device of the present disclosure can extract light confined in the optical waveguide mode from the light generated from the intermediate layer between the first electrode and the second electrode in the lateral direction of the substrate, thereby improving the viewing angle characteristics.

[0189] Third, the light emitting display device of the present disclosure minimizes the bank so that the bank is disposed in a region where the contact hole of the thin film transistor and the first electrode are disposed, thereby being able to improve the opening, thereby improving the life of the light emitting display device.

[0190] Fourth, in the light-emitting display device of the present disclosure, the second electrode extracts the light waveguide mode to the outside of the substrate through the shape of the side surface of the coating layer, so that the light extraction efficiency can be improved without any separate element, thereby reducing production energy consumption. Therefore, the light-emitting display device according to the present disclosure has an environmental, social and governance (ESG) effect in terms of environmental friendliness and process optimization.

[0191] The effects of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood from the above description by those skilled in the art.

[0192] It will be apparent to those skilled in the art that various modifications and variations may be made to the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure.

[0193] CROSS-REFERENCE TO RELATED APPLICATIONS

[0194] This application claims priority to Korean Patent Application No. 10-2023-0128334, filed on September 25, 2023, which is hereby incorporated by reference as if fully set forth herein.

Claims

1. A light-emitting display device, comprising: a substrate comprising a plurality of sub-pixels; a first coating layer, the first coating layer being located on the entire surface of the substrate; a second coating layer, the second coating layer being located on the first coating layer, the second coating layer having a side surface overlapping with a reflective region of each of the plurality of sub-pixels; a first electrode located on an upper surface of the second coating layer at a light emitting region of each of the plurality of sub-pixels; an intermediate layer, the intermediate layer being located above the first coating layer, the second coating layer and the first electrode; as well as a second electrode, the second electrode being located above the intermediate layer, the second electrode having a higher reflectivity than the first electrode, in: The reflective area is located outside the light emitting area; and The second electrode is positioned along a side surface of the second coating layer in the reflective region to surround an end portion of the first electrode.

2. The light-emitting display device according to claim 1, wherein: The side surface of the second coating layer comprises: a first side surface portion adjacent to the upper surface of the second coating layer; and A second side surface portion is adjacent to a lower surface of the second coating layer, and the second side surface portion has a shape different from that of the first side surface portion.

3. The light-emitting display device according to claim 2, wherein: The first side surface portion includes a curved line in a cross-sectional view.

4. The light-emitting display device according to claim 3, wherein: The first side surface portion includes a parabola in a cross-sectional view.

5. The light-emitting display device according to claim 4, wherein: The reflection region includes a first reflection region provided with a region of the second electrode following a parabola shape of the first side surface portion; The parabola satisfies the following equation to have a focus with coordinates (0, -a) at the end of the first electrode and a directrix with y=a; and The x-axis is parallel to the first electrode, and the y-axis passes through the focus of the coordinate (0, -a), Equation: -x 2 =4ay, where a is a constant greater than 0.

6. The light-emitting display device according to claim 2, wherein: The second side surface portion includes a straight line in a cross-sectional view.

7. The light-emitting display device according to claim 6, wherein: A first angle is between the second side surface portion of the second coating layer and the lower surface of the second coating layer; and An angle between the first side surface portion of the second coating layer and the lower surface of the second coating layer is smaller than the first angle.

8. The light-emitting display device according to claim 1, wherein: The upper surface of the second coating layer includes a region overlapping the first electrode.

9. The light-emitting display device according to claim 1, further comprising: a third coating layer, the third coating layer being located between the second coating layer and the first electrode, wherein the third coating layer comprises a first surface connected to the side surface of the second coating layer, Wherein, the second electrode is located in the reflective region along the first surface of the third coating layer.

10. The light emitting display device according to claim 9, wherein: The side surface of the second coating layer and the first surface of the third coating layer have different shapes.

11. The light-emitting display device according to claim 9, wherein: The first surface of the third coating layer includes a curved line in a cross-sectional view.

12. The light-emitting display device according to claim 11, wherein: The first surface of the third coating layer includes a parabola.

13. The light emitting display device according to claim 12, wherein: The reflective region includes a first reflective region provided with a region of the second electrode that follows the shape of the parabola of the first surface; The parabola satisfies the following equation to have a focus with coordinates (0, -a) at the end of the first electrode and a directrix with y=a; and The x-axis is parallel to the first electrode, and the y-axis passes through the focus of the coordinate (0, -a), Equation: -x 2 =4ay, where a is a constant greater than 0.

14. The light emitting display device according to claim 13, wherein: The third coating layer further comprises: a second surface in contact with the upper surface of the second coating layer; and A third surface contacts a lower portion of an edge of the first electrode and has a second angle with the second surface.

15. The light emitting display device according to claim 14, wherein: The side surface of the second coating layer includes a straight line in a cross-sectional view.

16. The light emitting display device according to claim 15, wherein: A first angle is between the side surface of the second coating layer and a lower surface of the second coating layer; and An angle between the first surface and the second surface of the third coating layer is smaller than the first angle.

17. The light-emitting display device according to claim 1, wherein: The end portion of the first electrode becomes thinner as the distance from the center of the first electrode increases.

18. The light-emitting display device according to claim 1, further comprising: a color filter located between the first coating layer and the substrate at the plurality of sub-pixels, Each of the color filters overlaps with the light emitting area and the reflective area.

19. A light-emitting display device, comprising: a substrate comprising a plurality of sub-pixels; a coating layer located on the substrate, the coating layer comprising a flat region overlapping with the light emitting region of each of the plurality of sub-pixels, and a first concave region surrounding the flat region and overlapping with the reflective region of each of the plurality of sub-pixels; a first electrode, the first electrode being located on the flat region of the coating layer; an intermediate layer, the intermediate layer being located above the coating layer and the first electrode; as well as a second electrode located above the intermediate layer, the second electrode being positioned along the first concave region of the coating layer to surround an end of the first electrode, The second electrode has a higher reflectivity than the first electrode.

20. The light emitting display device according to claim 19, wherein: The reflective area includes: a first reflective region, the first reflective region overlapping the first concave region of the coating layer; a second reflective region, the second reflective region being located outside the first reflective region relative to the flat region of the coating layer; and A third reflective region overlaps with an edge of the planar region of the coating layer.

21. The light-emitting display device according to claim 20, wherein: A region of the second electrode overlapping the first reflective region and a region of the second electrode overlapping the second reflective region have different shapes.

22. The light-emitting display device according to claim 20, wherein: A region of the second electrode overlapping the first reflective region includes a curved line in a cross-sectional view.

23. The light-emitting display device according to claim 20, wherein: A region of the second electrode overlapping the second reflective region includes a straight line in a cross-sectional view.

24. The light-emitting display device according to claim 20, wherein: The first electrode does not overlap with the reflective area.

25. The light emitting display device according to claim 19, wherein: The coating layer further includes a second concave area located between the flat area and the first concave area to surround the flat area.

26. The light-emitting display device according to claim 25, wherein: The first electrode has a region overlapping a portion of the second concave region.

27. A light-emitting display device, comprising: a substrate comprising a plurality of sub-pixels; A thin film transistor, the thin film transistor being located on the substrate; a coating layer located on the entire surface of the substrate and having at least one concave area; a first electrode spaced apart from the at least one concave region on the coating layer to correspond to each of the plurality of sub-pixels; an organic light-emitting layer, wherein the organic light-emitting layer is located above the first electrode; as well as a second electrode, the second electrode being located above the organic light-emitting layer, A light emitting area is arranged at the position where the first electrode is located, and a reflected light emitting area is arranged at the position where the first electrode is not located.

28. The light-emitting display device according to claim 27, wherein: At least one of the organic light emitting layer and the second electrode is in direct contact with the coating layer at the reflective light emission region.

29. The light-emitting display device according to claim 28, wherein: The reflective light emitting area surrounds at least three surfaces of the light emitting area.

30. The light-emitting display device according to claim 29, wherein: The coating layer has a first concave region; and The reflected light emitting region is disposed on the first inclined surface of the first concave region.

31. The light-emitting display device according to claim 30, further comprising a plurality of wirings along a first direction on the substrate, in, At least two of the plurality of wirings overlap a portion of the reflected light emitting region in the first direction.

32. The light-emitting display device according to claim 31, further comprising: a bank portion, the bank portion being located above the thin film transistor, The bank covers the thin film transistor and contacts the light emitting region in the second direction.

33. The light-emitting display device according to claim 30, in, The coating layer further includes a flat surface and a second concave region having a second inclined surface configured to extend from the flat surface, and The light emitting area including the second concave area is larger than an area of ​​the flat surface and surrounds the flat surface.

34. The light-emitting display device according to claim 33, wherein: The reflected light emitting area includes a first reflection area, a second reflection area and a third reflection area; and The reflective light emitting area surrounds the light emitting area in the order of the third reflective area, the first reflective area, and the second reflective area.

35. The light-emitting display device according to claim 34, further comprising: A plurality of wirings are provided along a first direction on the substrate, wherein the second reflective region overlaps at least two of the plurality of wirings.

36. A light-emitting display device, comprising: A first sub-pixel and a second sub-pixel are disposed on a substrate; a coating layer disposed between the first sub-pixel and the second sub-pixel and the substrate, the coating layer comprising a concave area between the first sub-pixel and the second sub-pixel; A first electrode disposed in the first sub-pixel and the second sub-pixel; a light-emitting layer, the light-emitting layer being arranged across the first sub-pixel, the concave region of the coating layer, and the second sub-pixel; as well as a second electrode, the second electrode being disposed on the light emitting layer and spanning the first sub-pixel, the concave region of the coating layer, and the second sub-pixel, A portion of the second electrode disposed in the concave region of the coating layer is closer to the substrate than the first electrodes of the first sub-pixel and the second sub-pixel.

37. The light-emitting display device according to claim 36, wherein: In a plan view, the concave region surrounds at least three sides of the first sub-pixel.

38. The light-emitting display device according to claim 36, wherein: The outer edge of the first electrode in the first sub-pixel has an inclined surface or a gradually tapering shape, and The outer edge of the first electrode in the second sub-pixel has an inclined surface or a gradually tapering shape.

39. The light-emitting display device according to claim 36, wherein: A portion of the second electrode overlapping the concave region has a curved shape or a parabolic shape and is configured to reflect light emitted from the light emitting layer in a direction toward the substrate.

40. The light-emitting display device according to claim 36, wherein: The coating layer further includes a first ridge portion disposed between the first sub-pixel and the second sub-pixel and a second ridge portion disposed between the first sub-pixel and the second sub-pixel, and Wherein, the concave area is located between the first ridge and the second ridge of the coating layer.

41. The light-emitting display device according to claim 40, wherein: A first peak of the first ridge of the coating layer and a second peak of the second ridge of the coating layer are located farther from the substrate than both the first electrode in the first sub-pixel and the first electrode in the second sub-pixel.

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