Light-emitting display device

Abstract

Disclosed is a light-emitting display device including a light-transmitting portion between a plurality of light-emitting portions, a first bank exposing each of the light-emitting portions and the light-transmitting portion, the first bank having a first side surface adjacent to the light-emitting portions, and an intermediate layer on the plurality of light-emitting portions and the first bank, and a second side surface adjacent to the light transmissive portion, and the second side surface has an inverted cone.

Description

Technical Field

[0001] The present disclosure relates to a light emitting display device, and more particularly, to a light emitting display device capable of preventing leakage current from flowing to adjacent sub-pixels. Background Art

[0002] With the advent of the information society, displays for visually expressing electrical information signals have been rapidly developed. In response to this, various display devices having superior performance such as slimness, reduced weight, and lower power consumption are being studied and developed.

[0003] Among them, the light-emitting display device includes a light-emitting element capable of spontaneously emitting light, and thus does not require a separate light source used in a non-light-emitting element, thereby achieving reduced weight and thickness.

[0004] The light emitting element includes an intermediate layer between a first electrode and a second electrode, and emits light when an electric field is applied between the first electrode and the second electrode.

[0005] A light-emitting display device including a light-emitting element may have a problem in which at least one sub-pixel among a plurality of sub-pixels emits light due to leakage current flowing from an adjacent sub-pixel. 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 capable of preventing light emission in some of the sub-pixels PXL due to leakage current flowing from adjacent sub-pixels.

[0008] Another object of the present disclosure is to provide a light emitting display device capable of preventing light emission in some of the sub-pixels PXL due to leakage current flowing from adjacent sub-pixels while preventing degradation of a light emitting element.

[0009] Additional advantages, purposes, and features of the present disclosure will be described in part in the following description, and in part will become apparent to those of ordinary skill in the art after examining the following description, or may be learned from the practice of the present disclosure. The purposes and other advantages of the present disclosure may be realized and obtained by the structures particularly pointed out in the written description and its claims and the accompanying drawings.

[0010] The light-emitting display device of the present disclosure can minimize the contact between the corresponding light-emitting portions of a plurality of sub-pixels by arranging the corresponding light-transmitting portions of the plurality of sub-pixels, thereby maximizing the path through which leakage current flows between adjacent sub-pixels.

[0011] In addition, the light emitting display device of the present disclosure includes an undercut region adjacent to the light transmitting portion, thereby blocking a path through which leakage current flows between adjacent sub-pixels, and at the same time, uniformly deposits an intermediate layer over the light emitting portion.

[0012] In addition, the light emitting display device of the present disclosure includes a nucleation suppressing layer in a light transmitting portion, thereby greatly reducing the thickness of an intermediate layer deposited on the nucleation suppressing layer and preventing leakage current from flowing through the intermediate layer having a high resistance on the light transmitting portion.

[0013] Therefore, according to one embodiment of the present disclosure, a light-emitting display device includes: a light-transmitting part located between a plurality of light-emitting parts, a first embankment exposing each of the light-emitting parts and the light-transmitting part, and an intermediate layer located on the plurality of light-emitting parts and the first embankment, wherein the first embankment has a first side surface adjacent to the light-emitting part, and a second side surface adjacent to the light-transmitting part, and the second side surface has a negative taper shape.

[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 in and constitute a part of this application, 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 illustrating a configuration of a light emitting display device according to a first embodiment of the present disclosure;

[0017] Figure 2 It is along Figure 1 A cross-sectional view taken along line II';

[0018] Figure 3 According to the second embodiment of the present disclosure, Figure 1 A cross-sectional view taken along line II';

[0019] Figure 4 According to the third embodiment of the present disclosure, Figure 1 A cross-sectional view taken along line II';

[0020] Figure 5 According to the fourth embodiment of the present disclosure, Figure 1 A cross-sectional view taken along line II';

[0021] Figure 6is a cross-sectional view illustrating a light emitting display device according to a fifth embodiment of the present disclosure;

[0022] Figure 7 is a cross-sectional view illustrating a light emitting display device according to a sixth embodiment of the present disclosure;

[0023] Figure 8 is a plan view illustrating a light emitting display device according to a seventh embodiment of the present disclosure; and

[0024] Fig. 9 It is along Figure 8 A cross-sectional view taken along line II-II'. DETAILED DESCRIPTION

[0025] According to the preferred embodiments described below with reference to the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving the advantages and features will be clearly understood. However, the present disclosure is not limited to the embodiments and can be implemented in different forms. It is suggested that these embodiments are only to provide a thorough and complete understanding of the disclosed context and to fully inform the technical concept of the present disclosure to those skilled in the art, and the embodiments of the present disclosure are limited only by the scope of the claims.

[0026] The shapes, sizes, dimensions (e.g., length, width, height, thickness, radius, diameter, area, etc.), ratios, angles, number of elements, etc. illustrated in the drawings for describing embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto.

[0027] For ease of description, dimensions including size and thickness of each component shown in the figures are illustrated, and the present disclosure is not limited to the size and thickness of the components shown. Instead, it should be noted that the relative dimensions including the relative size, position and thickness of the components shown in the various figures submitted herein are part of the present disclosure.

[0028] 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 the plural unless specifically stated otherwise.

[0029] Even without special description of the addition, the components included in the embodiments of the present disclosure should be construed to include an error range.

[0030] In describing various embodiments of the present disclosure, when terms describing positional relationships (such as "on," "over," "below," and "immediately adjacent") are used, unless "immediately" or "directly" are also used, at least one intermediate element may be present between the two components.

[0031] In describing various embodiments of the present disclosure, when terms related to a time relationship are used, such as "after," "subsequently," "next," and "before," discontinuities may be included unless "immediately" or "immediately" is also used.

[0032] In 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, throughout the present disclosure, unless otherwise specifically mentioned, a "first" component may be the same as a "second" component within the technical concept of the present disclosure.

[0033] The terms “first horizontal axis direction”, “second horizontal axis direction” and “vertical axis direction” should not be interpreted as a unique geometric relationship in which the relationship between each other is perpendicular, but should be interpreted as having a wider range of directions as long as the configuration of the present disclosure can function functionally.

[0034] 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" can refer to each of the first, second, and third items, and any combination of two or more of the first, second, and third items.

[0035] The features of different embodiments of the present disclosure may be partially or completely connected or combined with each other, and may interoperate and be technically driven differently from each other. The embodiments of the present disclosure may be performed independently of each other, or may be performed together in an interrelated manner.

[0036] When adding reference numerals to components in the various drawings, the same components may have the same reference numerals as much as possible even if they are shown in different drawings. In addition, for ease of description, the scales of the components shown in the drawings have a scale different from the actual scale and are therefore not limited to the scales shown in the drawings.

[0037] Hereinafter, preferred 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.

[0038] Figure 1 is a plan view of a light-emitting display device 1000 according to a first embodiment of the present disclosure. Figure 2 It is along Figure 1 A cross-sectional view taken along line II'.

[0039] Reference Figure 1, a light-emitting display device 1000 according to an embodiment of the present disclosure includes: a plurality of sub-pixels (PXL: PXL1, PXL2, PXL3, and PXL4) including a plurality of light-emitting parts (EA: EA1, EA2, EA3, and EA4) and a plurality of light-transmitting parts (TA: TA1, TA2, TA3, and TA4), a dam structure BK exposing the light-emitting parts EA and the light-transmitting parts TA, and an undercut area UA surrounding the light-transmitting parts TA. The undercut area UA may be disposed in the dam structure BK.

[0040] The subpixel PXL may be defined by a gate line and a data line, which are formed in a matrix form while intersecting each other on a substrate within a display area. At least one unit pixel of the subpixel PXL may include first to fourth subpixels PXL1, PXL2, PXL3, and PXL4. The first to fourth subpixels PXL1, PXL2, PXL3, and PXL4 may be arranged in a two-row and two-column structure. The fourth subpixel PXL4 may be arranged at the intersection of the first row and the first column, the third subpixel PXL3 may be arranged at the intersection of the first row and the second column, the first subpixel PXL1 may be arranged at the intersection of the second row and the first column, and the second subpixel PXL2 may be arranged at the intersection of the second row and the second column.

[0041] Each of the first to fourth sub-pixels PXL1, PXL2, PXL3, and PXL4 may include one emitting portion EA and one light-transmitting portion. Specifically, the first sub-pixel PXL1 may include a first emitting portion EA1 and a first light-transmitting portion TA1, the second sub-pixel PXL2 may include a second emitting portion EA2 and a second light-transmitting portion TA2, the third sub-pixel PXL3 may include a third emitting portion EA3 and a third light-transmitting portion TA3, and the fourth sub-pixel PXL4 may include a fourth emitting portion EA4 and a fourth light-transmitting portion TA4. Here, the first to fourth emitting portions EA1, EA2, EA3, and EA4 may emit red light, green light, blue light, and white light, respectively. For example, the emitting portion EA1 may emit red light, the second emitting portion EA2 may emit green light, the third emitting portion EA3 may emit blue light, and the fourth emitting portion EA4 may emit white light. In some cases, the fourth sub-pixel PXL4 emitting white light may be omitted, and the fourth sub-pixel PXL4 may include sub-pixels emitting at least two of red light, green light, blue light, yellow light, magenta light, and cyan light. In addition, a specific type of color filter may or may not be formed in the sub-pixels PXL, and the sub-pixels PXL may emit light of their own color.

[0042] In the sub-pixel PXL according to the first embodiment, the light emitting portion EA and the light transmitting portion TA may exist in an area ratio of 1:1. In addition, the corresponding light emitting portion EA of the sub-pixel PXL may be formed to extend longitudinally in one direction, and the corresponding light transmitting portion TA may have the same shape as the light emitting portion EA. For example, the first light emitting portion EA1 and the first light transmitting portion TA1 having the same shape as each other may be arranged parallel to each other on a plane. Similarly, the second light emitting portion EA2 and the second light transmitting portion TA2 may be arranged parallel to each other on a plane, the third light emitting portion EA3 and the third light transmitting portion TA3 may be arranged parallel to each other on a plane, and the fourth light emitting portion EA4 and the fourth light transmitting portion TA4 may be arranged parallel to each other on a plane.

[0043] The first to fourth sub-pixels PXL1, PXL2, PXL3, and PXL4 may be arranged such that the first to fourth light-transmitting portions TA1, TA2, TA3, and TA4 are concentrated at the center of the unit pixel. Figure 1 As shown, the first light transmission part TA1 and the second light transmission part TA2 may be adjacent to each other and may be arranged vertically, and the third light transmission part TA3 and the fourth light transmission part TA4 may be adjacent to each other and may be arranged vertically. In addition, the first light transmission part TA1 and the second light transmission part TA2 may be adjacent to the third light transmission part TA3 and the fourth light transmission part TA4. In addition, the first sub-pixel PXL1 has a shape corresponding to the fourth sub-pixel PXL4 rotated 90° counterclockwise, the second sub-pixel PXL2 has a shape corresponding to the first sub-pixel PXL1 rotated 90° counterclockwise, the third sub-pixel PXL3 has a shape corresponding to the second sub-pixel PXL2 rotated 90° counterclockwise, and the fourth sub-pixel PXL4 has a shape corresponding to the third sub-pixel PXL3 rotated 90° counterclockwise.

[0044] The arrangement of the first to fourth sub-pixels PXL1, PXL2, PXL3, and PXL4 enables the first to fourth light-emitting parts EA1, EA2, EA3, and EA4 to be spaced apart from each other in a manner that the first to fourth light-transmitting parts TA1, TA2, TA3, and TA4 are interposed therebetween. Therefore, the light-emitting display device of the present disclosure can ensure the spacing distance d between the light-emitting parts EA, thereby increasing the path of the leakage current between adjacent sub-pixels PXL. In addition, the increased leakage current path can prevent the leakage current from flowing between adjacent sub-pixels PXL.

[0045] In addition, the light-emitting display device 1000 of the present disclosure includes an undercut region UA ​​around the light-transmitting portion TA in the bank structure BK, the undercut region exposing the light-emitting portion EA and the light-transmitting portion TA, thereby blocking a path through which leakage current flows between sub-pixels PXL. Figure 2 The intermediate layer 113 in the embankment structure BK may contain a material that increases charge mobility. When the intermediate layer 113 is commonly formed in a plurality of sub-pixels PXL, it may cause leakage current between adjacent sub-pixels PXL. However, in the light-emitting display device 1000 of the present disclosure, the intermediate layer 113 may be disconnected due to the undercut area UA of the embankment structure BK. Therefore, the light-emitting display device of the present disclosure may prevent leakage current from flowing between adjacent sub-pixels PXL due to the disconnected intermediate layer 113.

[0046] Specifically, refer to Figure 2 According to the first embodiment, the light-emitting display device 1000 of the present disclosure includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 111 connected to each of the thin film transistors TFT, a light-emitting element 110 including the first electrode 111, an intermediate layer 113 and a second electrode 115, a first embankment 120 exposing a light-emitting portion EA and a light-transmitting portion TA, and an encapsulation film 170 covering the light-emitting element 110.

[0047] The substrate 10 is divided into a display area where a picture appears and a peripheral area where the picture does not appear, and the display area may include a plurality of sub-pixels PXL. Each sub-pixel PXL may include a light-emitting portion EA that actually emits light, and a non-light-emitting area around the light-emitting portion EA that does not emit light. The non-light-emitting portion may include a light-transmitting portion TA through which external light is transmitted. Here, the area of ​​the light-emitting portion EA and the area of ​​the light-transmitting portion TA are divided based on the embankment structure BK or the first embankment 120, but the light-emitting portion EA is not limited thereto. According to the light-emitting form, the light-emitting portion EA may be defined as an area extending from the first side surface 121 of the first embankment 120 to a portion of the top of the first embankment 120, and the light-transmitting portion TA may be defined as an area extending from the second side surface 122 of the first embankment 120 to a portion of the top of the first embankment 120. For example, when the substrate 10 is a plastic substrate, it may contain polyimide or polyamide. The first embankment 120 also has an upper surface US between the first side surface 121 and the second side surface 122.

[0048] On the substrate 10, various signal lines such as a data signal line and a gate signal line, transistors such as a switching thin film transistor and a driving thin film transistor, and circuit elements including a capacitor may be formed for each sub-pixel PXL. Transistors such as a switching thin film transistor and a driving thin film transistor may not overlap with the light transmission portion TA. For ease of explanation, a single thin film transistor TFT that drives one light emitting portion EA may be provided. In addition, as Figure 2 As shown, the thin film transistor TFT may overlap the emission portion EA, but the present disclosure is not limited thereto, and the thin film transistor TFT does not overlap the emission portion EA but overlaps the first bank 120 of the non-emission portion.

[0049] The thin film transistor TFT includes: an active layer 37, a gate electrode 43 overlapping the channel region 35 of the active layer 37 with a gate insulating film 41 located therebetween, and a source electrode 53 and a drain electrode 51 connected to both sides of the active layer 37, with a gate insulating film 41 between the gate electrode and the channel region.

[0050] The active layer 37 of the thin film transistor TFT includes a source region 33 and a drain region 31 on both sides thereof, with a channel region 35 between the source region and the drain region. Each of the source region 33 and the drain region 31 is formed of a semiconductor material doped with n-type or p-type impurities. The channel region 35 overlapping the gate electrode 43 may be formed of a semiconductor material not doped with n-type or p-type impurities.

[0051] The gate electrode 45 of the thin film transistor TFT is arranged to overlap the channel region 35 of the active layer 37, and has the same width as the channel region 35, and the gate insulating film 41 is inserted between the gate electrode and the channel region. The gate insulating film 41 overlaps the channel region 25 of the active layer 27 with the same pattern as the gate electrode 43. For example, the gate electrode 43 can be a single layer or multilayer containing one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof. In addition, the gate insulating film 41 can include an inorganic insulating material, and can include, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), a silicon oxynitride film (SiOxNy), or a plurality of films thereof.

[0052] In addition, the light blocking layer 21 on the substrate 10 overlaps at least the channel region 35 of the active layer 37 of the thin film transistor TFT and is disposed below the active layer 37. The light blocking layer 21 prevents external light from penetrating the substrate 10 and transmitting to the thin film transistor TFT. For example, the light blocking layer 21 may be a single layer containing a metal material such as molybdenum (Mo), titanium (Ti), aluminum-neodymium (AlNd), aluminum (Al), chromium (Cr), or an alloy thereof, or a multilayer structure using a single layer.

[0053] like Figure 2 As shown, the thin film transistor TFT is electrically connected to the light emitting element 110. In addition, the thin film transistor TFT overlaps the light emitting element 110 in a plan view.

[0054] The buffer film 20 on the light blocking layer 21 is provided in the form of covering the light blocking layer 21. For example, the buffer film 20 may have a single layer or multi-layer structure including silicon oxide (SiOx) or silicon nitride (SiNx).

[0055] The interlayer insulating film 30 on the buffer film 20 includes a source contact hole and a drain contact hole that expose each of the source region 33 and the drain region 31 of the active layer 37, and covers the gate insulating film 41 and the gate electrode 43. For example, the interlayer insulating film 30 may include an inorganic insulating material. For example, the interlayer insulating film 30 may be a single layer or multiple layers including a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a silicon oxynitride film (SiOxNy).

[0056] The source electrode 53 and the drain electrode 51 may be disposed in the same layer on the interlayer insulating film 30. Each of the source electrode 53 and the drain electrode 51 is connected to the source region 33 and the drain region 31 of the active layer 37 through a source contact hole and a drain contact hole. For example, the source electrode 53 and the drain electrode 51 may be a single layer containing a metal material such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), or an alloy thereof, or a multilayer structure using a single layer.

[0057] The passivation layer 40 on the interlayer insulating film 30 may be provided in the form of covering the thin film transistor region TFT. As a result, the thin film transistor region TFT may be protected by the passivation layer 40. For example, the passivation layer 40 is an inorganic insulating film and may be provided as a single-layer or multi-layer silicon oxide film (SiOx), a silicon nitride film (SiNx), or a silicon oxynitride film (SiOxNx).

[0058] A planarization layer 50 may be provided on the passivation layer 40. The planarization layer 50 is formed to a thickness sufficient to planarize the surface step at the top of the thin film transistor region TFT, and may be formed of an organic insulating film. In some cases, when the planarization layer 50 also functions to protect the thin film transistor TFT, the passivation layer 40 may be omitted. For example, the planarization layer 50 is an organic insulating film, and may be any one of photoacryl, polyimide, benzocyclobutene resin, and acrylate. In some cases, the planarization layer 50 may be formed as a multilayer.

[0059] The light emitting element 110 including a stacked structure of a first electrode 111, an intermediate layer 113, and a second electrode 115 may be provided on the planarization layer 50. In addition, the first bank 120 may be provided over the entire region in which the light emitting portion EA and the light transmitting portion TA are not present between the planarization layer 50 and the light emitting element 110. The light emitting element 110 may operate based on a mechanism in which, when a current is supplied from a power supply voltage line to the second electrode 115 and a high voltage current is supplied from the thin film transistor TFT to the first electrode 111, an electric field is formed between the first electrode 111 and the second electrode 115, and the intermediate layer 113 emits light.

[0060] The first electrode 111 may be disposed in each of a plurality of sub-pixels PXL and may not overlap with the light transmission portion TA. The first electrode 111 may be formed into a multilayer structure including a transparent conductive film and an opaque conductive film having a high reflection efficiency. The transparent conductive film of the first electrode 111 includes 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 may be a single layer or multilayer including any one of the group consisting of silver (Ag), aluminum (Al), copper (Cu), molybdenum (Mo), titanium (Ti), nickel (Ni), chromium (Cr), or tungsten (W) or an alloy thereof. For example, the first electrode 111 may have a structure in which a transparent conductive film, an opaque conductive film, and a transparent conductive film are stacked in sequence, or a structure in which a transparent conductive film and an opaque conductive film are stacked in sequence.

[0061] A first bank 120 covering the edge of the first electrode 111 may be disposed over the entire surface of the planarization layer 50 in such a manner as to expose the light emitting portions EA1 and EA2 and the light transmitting portion TA2. A first side surface 121 of the first bank 120 exposing the light emitting portions EA1 and EA2 has a forward tapered shape, and a second side surface 122 of the first bank 120 exposing the light transmitting portion TA2 has an inverse tapered shape.

[0062] In some embodiments, the intermediate layer 113 of the light emitting element 110 is located on the upper surface US of the first bank 120 . In addition, the second electrode 115 of the light emitting element 110 is located on the upper surface US of the first bank 120 .

[0063] exist Figure 2, the first side surface 121 and the second side surface 122 are inclined in the same direction. The first side surface 121 may have a first inclination angle relative to the planarization layer 50, and the second side surface 122 may have a second inclination angle θ (also referred to as a second side angle θ) relative to the planarization layer 50. In some embodiments, the first inclination angle of the first side surface 121 may be the same as the second inclination angle θ of the second side surface 122. In other embodiments, although the first inclination angle of the first side surface 121 may be different from the second inclination angle θ of the second side surface 122, the first side surface 121 and the second side surface 122 may extend substantially in the same direction (see Figure 2 and Fig. 9 However, in a completely different embodiment, the first side surface 121 may extend in a first direction, and the second side surface 122 may extend in a second direction transverse to the first direction (see Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 ).

[0064] Reference Figure 2 According to some embodiments, the intermediate layer 113 or the second electrode 115 extends continuously and continously from the light emitting element 110 to the upper surface US of the first bank 120. In some embodiments, the intermediate layer 113 or the second electrode 115 covers the first side surface 121 of the first bank 120. Here, the intermediate layer 113 directly contacts both the first side surface 121 and the upper surface US of the first bank 120. However, the intermediate layer 113 is spaced apart from the second side surface 122 of the first bank 120 and does not directly contact the second side surface 122 of the first bank 120.

[0065] In the present disclosure, the reverse taper shape means that the side surface of the object is reversely inclined relative to the forming plane. The reverse taper shape can be used as the same meaning as "reverse taper shape (reverse taper)".

[0066] In the present disclosure, a positive tapered shape means that the side surface of an object is positively inclined relative to a forming plane. The positive tapered shape may be used as the same meaning as a "regular tapered shape".

[0067] The intermediate layer 113 may be formed more uniformly on the first side surface 121 of the first bank 120 having a forward tapered shape than on the second side surface 122 having an inverted tapered shape. The intermediate layer 113 on the first bank 120 may be deposited in a manner concentrated below the side surface of the inverted tapered shape. In this way, when the side surface of the inverted tapered shape is provided in an area adjacent to the light-emitting portion, during the generation of an electric field in the light-emitting device, the electric field generated in the area where the intermediate layer material is concentrated below the inverted tapered shape is not emitted as light, and causes degradation of the light-emitting device. This may lead to a problem of shortening the life of the light-emitting device. However, the first bank 120 according to this embodiment has an inverted tapered shape on the second side surface 122 adjacent to the light-transmitting portion TA2, and the first side surface 121 has a forward tapered shape. Thus, the phenomenon that the deposited material is concentrated at the corner between the first side surface 121 and the first electrode 111 is prevented. Therefore, in the light-emitting display device of the present disclosure, an electric field may be constantly applied to the light-emitting portions EA1 and EA2, thereby preventing degradation of the light-emitting element 110.

[0068] The second side surface 122 of the first bank 120 may have an inverted tapered shape. The second side surface 122 having an inverted tapered shape may have a predetermined angle through a process such as over-etching. Here, the region where the second side surface 122 of the first bank 120 is formed may be an undercut region ( Figure 1 UA in). The outer angle θ relative to the second side surface 122 may be at least less than 90°. More specifically, the second side angle θ may be set to 70° or less so that the layer deposited on the top of the first bank 120 is disconnected, but the present disclosure is not limited thereto. Depending on the characteristics such as the thickness of the first bank 120 or the thickness of the intermediate layer 113 deposited on the first bank 120 and the step coverage, the second side angle θ may be about 70°. Therefore, the second side surface 122 of the first bank 120 has an inverted tapered shape so that the intermediate layer 133 deposited on the first bank 120 can be separated between the light-emitting parts EA1 and EA2 and the light-transmitting part TA2. Therefore, the light-emitting display device of the present disclosure has a second side surface 122 having an inverted tapered shape adjacent to the light-transmitting part TA2, thereby preventing degradation of the light-emitting element 110 and preventing leakage current from flowing between adjacent sub-pixels PXL1 and PXL2.

[0069] For example, the first bank 120 may be made of an organic material such as polyimide, acrylate, or benzocyclobutene resin.

[0070] The intermediate layer 113 may be disposed over the entire region of the substrate 10 on the first electrode 111 and the first bank 120. The intermediate layer 113 may refer to a single stack organic layer including a plurality of layers including a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML1 or EML2), an electron transport layer (ETL), and an electron injection layer (EIL). Figure 2 As shown, the intermediate layer 113 has a light-emitting unit having a series structure including a plurality of stacks (a first stack and a second stack), each stack having a first light-emitting layer (EML1) and a second light-emitting layer (EML2), and a charge generation layer (CGL) between the stacks. The series structure is not limited to the double stack structure shown, and may include a multi-layer stack having three or more stacks.

[0071] Here, the first light-emitting layer (EML1) and the second light-emitting layer (EML2) in the plurality of stacks may be light-emitting layers of the same color that emit one of red light, green light, and blue light, and may be partially disposed in each sub-pixel PXL. The other plurality of layers of the intermediate layer 113 other than the first light-emitting layer (EML1) and the second light-emitting layer (EML2) may be disposed over the entire surface of the substrate 10 as a common mask. Alternatively, when white light is emitted by the first light-emitting layer (EML1) and the second light-emitting layer (EML2) in the double stack structure or by the light-emitting layer in the multi-stack structure having three or more stacks, each of the light-emitting layers may be disposed over the entire surface of the substrate 10, as with the other intermediate layers 113.

[0072] The charge generation layer (CGL) may be composed of an n-type and p-type double layer. The n-type charge generation layer and the p-type charge generation layer of the charge generation layer (CGL) may include an n-type dopant and a p-type dopant, respectively. For example, the n-type dopant may include a metal dopant such as lithium (Li) or ytterbium (Yb). Such a metal dopant increases the charge mobility, so that the n-type charge generation layer formed in common in a plurality of sub-pixels may cause leakage current between adjacent sub-pixels. In addition to the n-type charge generation layer, the layer of the intermediate layer 113 containing a material having a high charge mobility may also cause leakage current.

[0073] However, the intermediate layer 113 of the present disclosure may be discontinuously deposited on the light transmission portion TA2 at the top of the first bank 120, rather than being continuously deposited on the adjacent light transmission portion TA2, due to the second side surface 122 of the first bank 120. The intermediate layer 113 on the light transmission portion TA2 may be provided as a dummy pattern 150 on the light transmission portion TA2, which is disconnected from the intermediate layer 113 on the first bank 120. Therefore, in the light-emitting display device according to the present disclosure, the intermediate layer 113 may be uniformly deposited in the light-emitting portions EA1 and EA2, and may be disconnected near the light transmission portion TA2, thereby preventing the light-emitting element 110 from being degraded and simultaneously preventing leakage current from flowing between sub-pixels PXL through the intermediate layer 113.

[0074] The second electrode 115 on the intermediate layer 113 may be formed over the entire surface of the substrate 10 by a common mask. The second electrode 115 made of metal is not limited to Figure 2 The configuration shown in FIG. 1 and has a better step coverage characteristic than the intermediate layer 113 made of an organic material or made of both an organic material and an inorganic material, so that it covers the exposed side surface of the intermediate layer 113 on the bank 120. In addition, the second electrode 115 may be separated on the light transmission portion TA2 by at least the second side surface 122 having an inverted tapered shape of the bank 120. Therefore, the dummy pattern 150 on the light transmission portion TA2 may include the second electrode 115 as well as the intermediate layer 113. For example, the second electrode 115 may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), and may be made of silver (Ag), aluminum (Al), magnesium (Mg) or calcium (Ca), or an alloy thereof having a thickness small enough to transmit light.

[0075] The encapsulation film 170 may be disposed on the second electrode 115 to completely cover the display area and the non-display area. The encapsulation film 170 prevents oxygen and moisture from penetrating into the light emitting element 110, thereby improving the life of the light emitting display device. For example, the encapsulation film 170 may be formed by stacking one or more pairs of inorganic encapsulation films and organic encapsulation films, or may be formed by stacking a filling material and an opposing substrate.

[0076] like Figure 2As shown, the dummy pattern 150 is adjacent to the first bank 120. The dummy pattern 150 includes an intermediate layer 113 and a second electrode 150. The intermediate layer 113 and the second electrode 150 of the dummy pattern 150 are the intermediate layer 113 and the second electrode 150 from the light emitting element 110. That is, when the intermediate layer 113 and the second electrode 150 of the light emitting element 110 are deposited, the intermediate layer 113 and the second electrode 150 of the dummy pattern 150 are deposited at the same time using the same material. However, as shown in the figure, the intermediate layer 113 and the second electrode 150 of the dummy pattern 150 are disconnected from the intermediate layer 113 and the second electrode 150 disposed on the upper surface US of the first bank 120.

[0077] Figure 3 According to the second embodiment, Figure 1 Hereinafter, description of the same configuration as that of the previous embodiment is omitted.

[0078] Reference Figure 3 The light-emitting display device according to the second embodiment of the present disclosure includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 211 connected to each of the plurality of thin film transistors TFT, a light-emitting element 210 including the first electrode 211, an intermediate layer 213 and a second electrode 215, and a dam structure ( Figure 1 BK in the figure) and a packaging film 170 covering the light emitting element 210.

[0079] The intermediate layer 213 and the second electrode 215 on the light transmission portion TA2 may be provided as a dummy pattern 250. The intermediate layer 213 of the dummy pattern 250 on the light transmission portion TA2 is disconnected from the intermediate layer 213 on the bank structure BK. The second electrode 215 of the dummy pattern 250 on the light transmission portion TA2 is disconnected from the second electrode 215 on the bank structure BK.

[0080] In the light-emitting display device according to the second embodiment of the present disclosure, the bank structure BK further includes a first bank 220 and a second bank 230 under the first bank 220. In addition, in the light-emitting display device according to the second embodiment of the present disclosure, the lower surface of the first bank 220 may contact the side surface of the second bank 230 adjacent to the light-transmitting portion TA2. For example, the first bank 220 and the second bank 230 may include the same material, but the present disclosure is not limited thereto. In some cases, the first bank 220 and the second bank 230 may include different materials.

[0081] The second bank 230 includes a first side surface 231, a second side surface 232 opposite to the first side surface 231, and an upper surface US located between the first side surface 231 and the second side surface 232. The first bank 220 includes a first side surface 221, a second side surface 222 opposite to the first side surface 221, and a lower surface LS located between the first side surface 221 and the second side surface 222. The lower surface LS of the bank 220 directly contacts the second side surface 232 of the second bank 230. The dummy pattern 250 may be disconnected from the second side surface 232 of the second bank 230 and the first bank 220.

[0082] The first bank 220 may have a first side surface 221 adjacent to the light emitting parts EA1 and EA2 and a second side surface 222 adjacent to the light transmitting part TA2. Here, the second side surface 222 of the first bank 220 may be a surface facing the substrate 10 and may have an inverted tapered shape. In addition, the lower surface of the first bank 220 may be defined as a surface between the first side surface 221 and the second side surface 222 that contacts the second bank 230. As the lower surface of the first bank 220 contacts the side surface 231 of the second bank 230, the lower surface and the upper surface of the first bank 220 are parallel to the side surface 231 of the second bank 230. In other words, the intermediate layer 213 may be easily deposited on the upper surface of the first bank 220. However, although the second side surface 222 of the first bank 220 has an inverted tapered shape, the first bank 220 may form an undercut on the side surface 231 of the second bank 230. Therefore, the first bank 220 has a second side surface 222 including an inverse tapered shape, thereby disconnecting the intermediate layer 213. The area occupied by the first bank 220 between the light emitting portion EA and the light transmitting portion TA2 may correspond to Figure 1 The undercut area UA in.

[0083] In addition, the first bank 220 may be disposed on the side surface 231 of the second bank 230 at a height at least higher than the thickness of the intermediate layer 213. That is, a vertical distance A1 between the lower surface of the second bank 230 and the first bank 220 may be greater than the thickness A2 of the intermediate layer 213. More specifically, the distance A1 may be a vertical distance between an edge between the second side surface 222 and the lower surface of the first bank 220 and the lower surface of the second bank 230. Therefore, a sufficient spacing distance between the second side surface 222 of the first bank 220 and the planarization layer 50 (which is at least the thickness A2 of the intermediate layer 213) enables the intermediate layer 213 to be separated by the first bank 220.

[0084] Likewise, the second side surface 222 of the first bank 220 has an inverted tapered shape structure and is spaced apart from the lower surface of the second bank 230 by a predetermined distance A1 on the side surface 231 of the second bank 230 so as to disconnect the intermediate layer 213 deposited on the first bank 220. Therefore, the material of the intermediate layer 213 deposited as a common mask over the entire surface of the substrate 10 is separated from the light emitting portions EA1 and EA2 into the light transmitting portion TA2 by the second side surface 222 of the first bank 220 having the inverted tapered shape.

[0085] In addition, the first side surface 221 adjacent to the light emitting portions EA1 and EA2 of the first bank 220 may have various shapes according to a process method for forming the second side surface 222 having the reverse tapered shape. Figure 3 It is shown that the first side surface 221 of the first bank 220 adjacent to the light emitting parts EA1 and EA2 has an inverted tapered shape. The first side surface 221 having the inverted tapered shape may have an inclination relative to the deposition direction of the material of the intermediate layer 213. Therefore, less intermediate layer 213 may be deposited on the first side surface 221 having the inverted tapered shape compared to the side perpendicular to the deposition direction of the material of the intermediate layer 213. Therefore, since the first side surface 221 has the inverted tapered shape, the intermediate layer 213 may be relatively easily disconnected, but the present disclosure is not limited thereto, and the first side surface 221 of the first bank 220 may have a forward tapered shape or a side surface 231 perpendicular to the second bank 230.

[0086] The side surface 231 of the second bank 230 may have a forward tapered shape. The side surface 231 of the second bank 230 adjacent to the light emitting parts EA1 and EA2 has a forward tapered shape, and the intermediate layer 213 deposited on the first electrode 211 and the second bank 230 may be uniformly deposited. Therefore, the light emitting display device of the present disclosure enables uniform deposition of the intermediate layer 213 material in the light emitting parts EA1 and EA2, thereby preventing degradation of the light emitting element 210.

[0087] The width between the light emitting parts EA1 and EA2 and the light transmitting part TA2 on the cross-sectional surface of the first bank 220 and the second bank 230 according to the second embodiment may be equal to the width between the light emitting parts EA1 and EA2 and the light transmitting part TA2 on the cross-sectional surface of the first bank 120 according to the first embodiment. For this reason, the first bank 220 according to the second embodiment may have a size smaller than that of the first bank 120 according to the first embodiment. Therefore, even if an additional bank is provided in the width direction in the second embodiment, the size of the first bank 220 according to the second embodiment is different from that of the first bank of the first embodiment, so that the area between the light emitting parts EA1 and EA2 and the light transmitting part TA2 may not be occupied separately, but the present disclosure is not limited thereto. In some cases, without adjusting the size of the first bank 220, the cross-sectional width occupied by the bank structure BK according to the first embodiment and the cross-sectional width occupied by the bank structure BK according to the second embodiment may be different.

[0088] According to some embodiments, the lower surface LS of the bank 220 directly contacts the upper surface US of the bank structure or the bank structure (eg, the bank 230; see Figure 3 )'s second side surface 232. Figure 5 An example is illustrated in which the lower surface LS of the bank 420 directly contacts the upper surface US of the bank 430 .

[0089] In some embodiments, the intermediate layer 213, 313, 413, 513, 713 or the second electrode 215, 315, 415, 515, 715 extends continuously and continually from the light emitting element 210, 310, 410, 510, 710 to the upper surface US of the embankment 230, 330, 430, 530, 730 and the first side surface 231, 331, 431, 731 of the embankment.

[0090] In some embodiments, the intermediate layer or the second electrode does not contact the second side surface 222 of the bank 220 (in Figure 3 In some embodiments, the intermediate layer or the second electrode does not contact the second side surface 322 of the bank 320 (in Figure 4 In some embodiments, the intermediate layer or the second electrode does not contact the second side surface 422 of the bank 420 (in Figure 5 In some embodiments, the intermediate layer or the second electrode does not contact the second side surface 722 of the bank 720 (in Figure 7 middle).

[0091] Figure 4 According to the third embodiment of the present disclosure, Figure 1 A cross-sectional view taken along line II'.

[0092] Reference Figure 4 The light-emitting display device according to the third embodiment includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 311 connected to each of the plurality of thin film transistors TFT, a light-emitting element 310 including the first electrode 311, an intermediate layer 313 and a second electrode 315, and a levee structure ( Figure 1 The first bank 320 includes a first side surface 321, a second side surface 322 opposite to the first side surface 321, and a lower surface LS between the first side surface 321 and the second side surface 322. The lower surface LS of the first bank 320 directly contacts the second side surface 332 of the second bank 330.

[0093] The intermediate layer 313 and the second electrode 315 on the light transmission portion TA2 may be provided as a dummy pattern 350. The intermediate layer 313 of the dummy pattern 350 on the light transmission portion TA2 is disconnected from the intermediate layer 313 on the bank structure BK. The second electrode 315 of the dummy pattern 350 on the light transmission portion TA2 is disconnected from the second electrode 315 on the bank structure BK. The dummy pattern 350 may be disconnected from the second side surface 332 of the second bank 330 and the first bank 320.

[0094] In the light-emitting display device according to the third embodiment of the present disclosure, the embankment structure BK may have a concave portion (CA) on one side adjacent to the light-transmitting portion TA2. Specifically, the embankment structure BK further includes a first embankment 320 and a second embankment 330 below the first embankment 320. In addition, in the light-emitting display device according to the third embodiment of the present disclosure, the lower surface of the first embankment 320 may contact the side surface of the second embankment 330 adjacent to the light-transmitting portion TA2. Here, the concave portion CA may be provided between the second side surface 322 of the first embankment 320 and the side surface 331 of the second embankment 330. The concave portion CA may cause an undercut in the embankment structure BK.

[0095] To this end, the second side surface 322 of the first bank 320 facing the substrate 10 may have a forward tapered shape relative to the second bank 330. In addition, the second side surface 322 may have an outer angle θ of 70° or less relative to the substrate 10. Therefore, the intermediate layer 313 deposited in the direction of the substrate 10 may be disconnected by the second side surface 322 of the first bank 320 having the forward tapered shape. In addition, since the first bank 320 is located above the side surface 331 of the second bank 330 adjacent to the light transmission part TA2, the intermediate layer 313 may be disconnected near the light transmission part TA2. That is, the material for the intermediate layer 313 may separate the light emitting parts EA1 and EA2 from the light transmission part TA2 through the first bank 320.

[0096] In addition, the upper surface of the first bank 320 between the first side surface 321 and the second side surface 322 may be located at a height on the side surface 331 of the second bank 330 that is at least greater than the thickness A2 of the intermediate layer 313. That is, a vertical distance A1 of the first bank 320 from the lower surface of the second bank 330 may be greater than the thickness A2 of the intermediate layer 313. Therefore, a sufficient spacing distance (at least not less than the thickness A2 of the intermediate layer 313) between the second side surface 322 of the first bank 320 and the planarization layer 50 enables the intermediate layer 313 to be separated to the light transmission portion TA2 by the first bank 320.

[0097] also, Figure 4 It is shown that the first side surface 321 of the first embankment 320 adjacent to the light-emitting parts EA1 and EA2 is in an inverted cone shape or is reversely inclined relative to the side surface 331 of the second embankment 330 adjacent to the light-transmitting part TA2, but the first side surface 321 of the first embankment 320 is not limited to this, and can be in an inverted cone shape or reversely inclined relative to the side surface 331 of the second embankment 330, in a regular cone shape or positively inclined relative to the side surface 331 of the second embankment 330, or perpendicular to the side surface 331 of the second embankment 330.

[0098] Figure 5 According to the fourth embodiment of the present disclosure, Figure 1 A cross-sectional view taken along line II'.

[0099] Reference Figure 5 The light-emitting display device according to the fourth embodiment includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 411 connected to each of the plurality of thin film transistors TFT, a light-emitting element 410 including the first electrode 411, an intermediate layer 413 and a second electrode 415, and a levee structure ( Figure 1The first embankment 420 includes a first side surface 421, a second side surface 422 opposite to the first side surface 421, and a lower surface LS between the first side surface 421 and the second side surface 422. The lower surface LS of the first embankment 420 directly contacts the upper surface US of the second embankment 430.

[0100] The intermediate layer 413 and the second electrode 415 on the light transmission portion TA2 may be provided as a dummy pattern 450. The intermediate layer 413 of the dummy pattern 450 on the light transmission portion TA2 is disconnected from the intermediate layer 413 on the bank structure BK. The second electrode 415 of the dummy pattern 450 on the light transmission portion TA2 is disconnected from the second electrode 415 on the bank structure BK. The dummy pattern 450 may be disconnected from the first bank 420.

[0101] In the light emitting display device according to the fourth embodiment of the present disclosure, the bank structure BK may have an undercut region ( Figure 1 UA in the figure). Specifically, the embankment structure BK according to the fourth embodiment may further include a first embankment 420 and a second embankment 430 located below the first embankment 420. At the same time, the lower surface LS of the first embankment 420 may contact the upper surface US of the second embankment 430. At this time, the second side surface 422 of the first embankment 420 adjacent to the light transmission part TA2 has an inverted tapered shape and may cause an undercut in the embankment structure BK. The upper surface 421 of the first embankment 420 contacts the intermediate layer 413.

[0102] like Figure 5 As shown, the lower surface LS of the first bank 420 may be disposed on the upper surface US of the second bank 430 adjacent to the light transmission portion TA2 to provide the recess CA. In other words, the recess CA may be disposed between the second side surface 422 of the first bank 420 and the side surface 432 of the second bank 430.

[0103] The second side surface 422 of the first bank 420 may have an outer angle θ of 70° or less relative to the substrate 10. This enables the intermediate layer 413 to be disconnected by the second side surface 422 of the first bank 420. The outer angle θ of the second side surface 422 is 70°, which facilitates the disconnection of the intermediate layer 413, but the present disclosure is not limited thereto. According to the step coverage characteristics of the material forming the intermediate layer 413 or the thickness of the intermediate layer 413, the outer angle θ of the second side surface 422 is about 70°.

[0104] Therefore, the first bank 420 has a second side surface 422 in an inverted tapered shape, so that the intermediate layer 413 deposited on the first bank 420 is disconnected in a region adjacent to the light transmission portion TA2. Therefore, the intermediate layer 413 deposited on the entire surface of the substrate 10 as a common mask separates the light emitting parts EA1 and EA2 from the light transmission portion TA2 through the second side surface 422 in an inverted tapered shape of the first bank 420.

[0105] Figure 6 This is a light emitting display device according to a fifth embodiment of the present disclosure.

[0106] Reference Figure 6 According to the fifth embodiment, the light-emitting display device includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 511 connected to each of the plurality of thin film transistors TFT, a light-emitting element 510 including the first electrode 511, an intermediate layer 513 and a second electrode 515, a bank 530 exposing the light-emitting portion (EA1, EA2) and the light-transmitting portion TA2, a nucleation inhibition layer 560 on the light-transmitting portion TA, and an encapsulation film 170 covering the light-emitting element 510.

[0107] The light-emitting display device according to the fifth embodiment of the present disclosure includes one bank 530, and the side surface of the bank 530 adjacent to the light-emitting portion EA and the light-transmitting portion TA may have a forward tapered shape. In the structure of the bank 530 having the forward tapered shape, the disconnection of the intermediate layer 513 may not be easy. However, in the light-emitting display device according to the fifth embodiment of the present disclosure, in order to prevent the leakage current from flowing between the adjacent sub-pixels PXL through the intermediate layer 513, the nucleation suppression layer 560 is provided in the light-transmitting portion TA.

[0108] A nucleation suppression layer 560 may be disposed on the planarization layer 50 between the banks 530 exposing the light transmission portion TA. The nucleation suppression layer 560 has a surface having a low affinity for the conductive material, thereby suppressing the deposition of the intermediate layer 513 including the conductive material. To this end, the nucleation suppression layer 560 and the intermediate layer 513 may each include a material having the following properties.

[0109] The nucleation inhibition layer 560 includes an organic material. In some embodiments, the nucleation inhibition layer 560 may include an organic material and an organic polymer, and may include a polycyclic aromatic hydrocarbon compound containing at least one heteroatom (e.g., N (nitrogen), S (sulfur), O (oxygen), phosphorus (P), or aluminum (Al)). The polycyclic aromatic hydrocarbon compound may include an organic molecule including a core moiety and at least one end portion bonded to the core moiety. For example, the material used for the nucleation inhibition layer 560 is 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (BA1q), 2-(4-(9,10-di(naphthalen-2-yl) anthracen-2-yl) phenyl) -1-phenyl-1H-benzo- [D] imidazole, 8-hydroxyquinoline lithium (Liq) and N (diphenyl-4-yl) 9,9-dimethyl-N-(4 (9-phenyl-9H-carbasol-3-yl) phenyl) -9H-fluoren-2-amine, etc.

[0110] In addition, the nucleation suppression layer 560 may have a thickness sufficient to maintain a predetermined transmittance of the light transmission portion TA. In addition, the material for the nucleation suppression layer 560 may be selectively limited to a material that suppresses deposition of the material of the intermediate layer 513 in order to maintain a predetermined transmittance of the light transmission portion TA.

[0111] The intermediate layer 513 is composed of a plurality of layers, including a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), an electron transport layer (ETL), an electron injection layer (EIL), and a charge generation layer (CGL) between the stacked layers. In addition, each layer forming the intermediate layer 513 may include a conductive material. For example, the material for the hole injection layer (HIL) and the hole transport layer (HTL) may be a low molecular weight material, a high molecular weight material (e.g., PEDPT:PSS, MoO3, ReO3, and NiO x) and metal oxides, but not limited thereto. The materials for the hole injection layer (HIL) and the hole transport layer (HTL) may be materials having a hole injection function and a hole transport function, respectively, and are generally known hole injection materials and hole transport materials. For example, the electron injection layer (EIL) and the electron transport layer (ETL) are alkali metals with a low work function such as Li, Ca, and Mg, metal ions such as LiF and CsF, and compounds such as Cs2CO3 and RbCO3, but the electron injection layer (EIL) and the electron transport layer (ETL) are not limited thereto. The materials for the electron injection layer (EIL) and the electron transport layer (ETL) are materials having an electron injection function and an electron transport function, respectively, and are generally known electron injection materials and electron transport materials. The charge generation layer (CGL) may have a double-layer structure of an n-type and p-type charge generation layer (CGL). The n-type charge generation layer and the p-type charge generation layer of the charge generation layer (CGL) may include an n-type dopant and a p-type dopant, respectively. For example, the n-type dopant may include a metal dopant such as lithium (Li) or ytterbium (Yb).

[0112] Likewise, the plurality of layers constituting the intermediate layer 513 may include a conductive material as well as an organic material. When the plurality of layers forming the intermediate layer 513 are sequentially deposited on the surface of the nucleation inhibition layer 560, the conductive material contained in each layer may not adhere to the surface of the nucleation inhibition layer 560 due to the low affinity to the material forming the nucleation inhibition layer 560. In other words, the conductive material used to form the intermediate layer 513 has a very low surface adhesion probability to the nucleation inhibition layer 560. Here, in the case of depositing the conductive material, the surface adhesion probability may be measured by depositing the conductive material in an amount required to form a closed-pack layer having an average thickness of 1 nm on the surface of the nucleation inhibition layer 560. Specifically, the conductive material is simultaneously deposited on the surface of the nucleation inhibition layer 560, and when the average thickness of the layer concentrated on the surface of the nucleation inhibition layer 560 reaches 1 nm, the average thickness of the conductive material deposited on the substrate is compared to obtain the probability of the conductive material adhering to the surface of the nucleation inhibition layer 560.

[0113] The deposition of the intermediate layer 513 containing the conductive material can be fixed to the surface of the nucleation inhibition layer 560 by the nucleation and growth process. However, as described above, the intermediate layer 513 containing the conductive material can have a low probability of adhesion to the nucleation inhibition layer 560. The probability of the conductive material to the surface of the nucleation inhibition layer 560 can be at most 0.3 (or 30%) and at most 0.0008 (or 0.08%) or less. Therefore, during the nucleation and growth process, the conductive material constituting the intermediate layer 513 can be separated due to the low affinity to the nucleation inhibition layer 560, and may not be formed to a set thickness or may be formed only partially. Each layer constituting the intermediate layer 513 is formed very thin and can affect the nucleation inhibition layer 560 in the layer below. As a result, the entire thickness of the intermediate layer 513 formed on the nucleation inhibition layer 560 is much smaller than the thickness of the intermediate layer 513 formed simultaneously on the area (the light emitting part, and the area between the light emitting part and the light transmitting part) where the nucleation inhibition layer 560 is not provided. That is, due to the nucleation suppression layer 560, the second thickness (t2) of the intermediate layer 513 on the light transmission part TA is much smaller than the first thickness (t1) of the intermediate layer 513 on the bank 530 and the first electrode 511 of the light emitting part EA. Therefore, the intermediate layer 513 in the light transmission part TA between the sub-pixels PXL has a very high resistance due to its small thickness, thereby suppressing the flow of current. Therefore, the light emitting display device of the present disclosure prevents leakage current from flowing through the intermediate layer 513.

[0114] Figure 7 is a cross-sectional view illustrating a light emitting display device according to a sixth embodiment of the present disclosure.

[0115] Reference Figure 7 The light-emitting display device according to the sixth embodiment includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 511 connected to each of the plurality of thin film transistors TFT, a light-emitting element 710 including a first electrode 711, an intermediate layer 713 and a second electrode 715, and a bank structure ( Figure 1 The light emitting display device according to the sixth embodiment of the present disclosure includes the first bank 720 and the second bank 720 and 730 and the nucleation suppression layer 760, thereby more effectively preventing the leakage current from flowing through the intermediate layer 713 between the adjacent sub-pixels PXL. The bank 730 includes a first side surface 731, a second side surface 732 opposite to the first side surface 731, and an upper surface US located between the first side surface 731 and the second side surface 732.

[0116] In the light emitting display device according to the sixth embodiment, the bank structure BK is not limited to Figure 7configuration shown, and can optionally provide Figures 2 to 5 Any of the bank structures BK shown. That is, the light-emitting display device according to the sixth embodiment has an undercut through the first bank portion 720 adjacent to the light-transmitting portion TA in the bank structure BK, thereby disconnecting the intermediate layer 713. In addition, by providing the nucleation suppression layer 760 on the planarization layer 50 of the light-transmitting portion TA, the intermediate layer pattern 713a on the nucleation suppression layer 760 can be formed to a second thickness t2. The second thickness (t2) of the intermediate layer pattern 713a on the nucleation suppression layer 760 can be less than the first thickness (t1) of the intermediate layer 713 on the first electrode 711 and the bank portion 730. Therefore, in the light-emitting display device according to the sixth embodiment, even if the intermediate layer 713 is not disconnected by the first bank portion 720, the nucleation suppression layer 760 prevents current from flowing between the intermediate layer 713 and the intermediate layer pattern 713a, thereby preventing leakage current from flowing through the intermediate layer 713. In addition, the intermediate layer pattern 713 a contacting the nucleation suppression layer 760 may be formed as a dummy pattern 750 in the light transmitting portion TA together with the second electrode 715 .

[0117] Figure 8 is a plan view illustrating a light emitting display device according to a seventh embodiment of the present disclosure. Fig. 9 It is along Figure 8 A cross-sectional view taken along line II-II'.

[0118] Reference Figure 8 The light-emitting display device according to the seventh embodiment of the present disclosure includes: a plurality of sub-pixels including light-emitting parts (EA: EA1, EA2, EA3, and EA4) and light-transmitting parts (TA: TA1, TA2, TA3, and TA4), a dam structure BK exposing the light-emitting parts EA and the light-transmitting parts TA, and an undercut area UA around the light-emitting parts EA. Here, the undercut area UA according to the seventh embodiment may be provided around the light-emitting parts EA.

[0119] In addition, refer to Fig. 9 According to the seventh embodiment, the light-emitting display device of the present disclosure includes: a plurality of thin film transistors TFT on a substrate 10, a first electrode 611 connected to each of the plurality of thin film transistors TFT, a light-emitting element 610 including the first electrode 611, an intermediate layer 613 and a second electrode 615, a dam 620 and a packaging film 170 covering the light-emitting element 610.

[0120] At least one unit pixel of the plurality of sub-pixels PXL may include first to fourth sub-pixels PXL1, PXL2, PXL3, and PXL4. The first to fourth sub-pixels PXL1, PXL2, PXL3, and PXL4 may be arranged in a two-row and two-column structure. The fourth sub-pixel PXL4 may be arranged at an intersection of the first row and the first column, the third sub-pixel PXL3 may be arranged at an intersection of the first row and the second column, the first sub-pixel PXL1 may be arranged at an intersection of the second row and the first column, and the second sub-pixel PXL2 may be arranged at an intersection of the second row and the second column.

[0121] Compared with the first embodiment, the light-emitting display device according to the seventh embodiment may have an increased area of ​​each light-transmitting portion TA. The first to fourth light-transmitting portions TA1, TA2, TA3, and TA4 may be arranged along the outer edges of the corresponding first to fourth light-emitting portions EA1, EA2, EA3, and EA4. For example, in the fourth subpixel PXL4, the fourth light-transmitting portion TA4 may be arranged along the outer edge of the fourth light-emitting portion EA4 in a space adjacent to the fourth light-emitting portion EA4 between the first to third subpixels PXL1, PXL2, and PXL3. In addition, the third subpixel PXL3 may have the same structure as the fourth subpixel PXL4 described above. In addition, the first subpixel PXL1 and the second subpixel PXL2 may be arranged below the third subpixel PXL3 and the fourth subpixel PXL4 symmetrically with each other based on the column axis with the third subpixel PXL3 and the fourth subpixel PXL4. Therefore, by changing the arrangement structure of the sub-pixels PXL from that of the first embodiment, the light-emitting display device of the present disclosure according to the seventh embodiment has an increased spacing distance (d) between two adjacent light-emitting portions EA compared to the first embodiment. Therefore, in the light-emitting display device according to the seventh embodiment, due to the increased spacing distance d, the path of the leakage current may also be increased, thereby preventing the leakage current from flowing between the adjacent sub-pixels PXL.

[0122] In addition, in the first to fourth subpixels PXL1, PXL2, PXL3, and PXL4, each of the light emitting parts EA1, EA2, EA3, and EA4 and the corresponding light transmitting parts of the light transmitting parts TA1, TA2, TA3, and TA4 may exist in an area ratio of 1 to 3. Compared with the first embodiment in which the area ratio of the light emitting part EA to the light transmitting part TA is 1 to 1, the light emitting display device according to the seventh embodiment has increased transmittance due to the increased area of ​​the light transmitting part TA.

[0123] Reference Fig. 9, the bank 620 according to the seventh embodiment includes: a first side surface 621 having an inverted tapered shape exposing the light-emitting parts EA1 and EA2, and a second side surface 622 having a forward tapered shape exposing the light-transmitting part TA2. The bank 620 according to the seventh embodiment may have a forward tapered shape adjacent to the light-emitting parts EA1 and EA2. Therefore, the path of the intermediate layer 613 between the adjacent sub-pixels PXL1 and PXL2 may be increased. Therefore, even if the separation of the intermediate layer 613 does not occur at the first side surface 621, the bank 620 according to the seventh embodiment increases the path of the intermediate layer 613 between the adjacent light-emitting parts EA1 and EA2, thereby preventing the leakage current from flowing between the adjacent sub-pixels PXL1 and PXL2 through the intermediate layer 613.

[0124] In addition, the outer angle θ relative to the first side surface 621 of the bank 620 may be less than 90°. More specifically, the first side angle θ may be set to 70° or less so that the layer deposited on the top of the bank 620 is disconnected, but the present disclosure is not limited thereto. Considering factors such as the thickness of the bank 620, the thickness of the intermediate layer 613 deposited on the bank 620, and the characteristics of the step coverage, the first side angle θ may be about 70°. Therefore, the bank 620 may separate the intermediate layer 613 between the adjacent sub-pixels PXL1 and PXL2.

[0125] In addition, the dummy pattern 650 has an inverted tapered shape of the first side surface 621 of the bank 620 formed adjacent to the light emitting portions EA1 and EA2, thereby providing an upper surface and a side surface of the bank 620. Therefore, the dummy pattern 650 according to the seventh embodiment may be disposed on the top surface and the second side surface 622 of the bank 620 and the planarization layer 50 of the light transmitting portion TA2.

[0126] As described above, the light emitting display device according to the seventh embodiment can minimize the contact between the light emitting parts EA of each of the plurality of sub-pixels PXL by the arrangement of the light transmitting portion TA of each of the plurality of sub-pixels PXL and the inverted tapered shape of the bank 620 adjacent to the light emitting part EA in the first light emitting part EA. Therefore, even if the intermediate layer 613 is not completely separated by the first side surface 621 having the inverted tapered shape, the light emitting display device according to the seventh embodiment maximizes the path through which the leakage current can flow between the adjacent sub-pixels PXL, thereby providing an effect of preventing light emission in some of the sub-pixels PXL caused by the leakage current flowing from the adjacent sub-pixels.

[0127] A light emitting display device according to one embodiment of the present disclosure may include a light transmitting portion between a plurality of light emitting portions, a first bank exposing each of the light emitting portion and the light transmitting portion, and an intermediate layer on the light emitting portion and the first bank.

[0128] In the light emitting display device according to one embodiment of the present disclosure, the first bank may have a first side surface adjacent to one of the plurality of light emitting portions and a second side surface adjacent to the light transmitting portion.

[0129] In the light emitting display device according to one embodiment of the present disclosure, the second side surface may have an inverse tapered shape.

[0130] In the light emitting display device according to one embodiment of the present disclosure, the first side surface may have a forward tapered shape.

[0131] The light emitting display device according to one embodiment of the present disclosure may further include a second bank under the first bank. A side surface of the second bank adjacent to one of the plurality of light emitting parts and a side surface adjacent to the light transmitting part may have a forward tapered shape.

[0132] In the light emitting display device according to one embodiment of the present disclosure, a lower surface of the first bank between the first side surface and the second side surface may be disposed above a side surface of the second bank adjacent to the light transmitting portion.

[0133] In the light emitting display device according to one embodiment of the present disclosure, a vertical distance between a lower surface of the second bank and the first bank may be greater than a thickness of the intermediate layer.

[0134] The light-emitting display device according to one embodiment of the present disclosure may further include a dummy pattern located in the light transmission portion. The dummy pattern may be disposed on the same layer as at least one of the plurality of layers included in the intermediate layer. The dummy pattern and the intermediate layer may be discontinuous.

[0135] In the light emitting display device according to one embodiment of the present disclosure, each of the dummy pattern and the intermediate layer may include at least one charge generation layer. The at least one charge generation layer of the dummy pattern may be disposed in the same layer as the at least one charge generation layer of the intermediate layer.

[0136] The light emitting display device according to one embodiment of the present disclosure may further include a nucleation inhibiting layer under the dummy pattern.

[0137] In the light emitting display device according to one embodiment of the present disclosure, the dummy pattern may include an intermediate layer pattern. A thickness of the intermediate layer pattern may be smaller than a thickness of the intermediate layer.

[0138] In the light emitting display device according to one embodiment of the present disclosure, a lower surface of the first bank between the first side surface and the second side surface may be disposed on an upper surface of the second bank.

[0139] In the light emitting display device according to one embodiment of the present disclosure, a lower surface of the first bank may be disposed at an edge of an upper surface of the second bank adjacent to the light transmitting portion.

[0140] In the light emitting display device according to one embodiment of the present disclosure, the first side surface may have an inverse tapered shape.

[0141] A light emitting display device according to one embodiment of the present disclosure includes a light transmitting portion between a plurality of light emitting portions and a dam structure exposing each of the light emitting portion and the light transmitting portion, wherein a side surface of the dam structure adjacent to the light transmitting portion has a recess.

[0142] In a light-emitting display device according to an embodiment of the present disclosure, the embankment structure includes: a first embankment having a first side surface adjacent to one of a plurality of light-emitting parts and a second side surface adjacent to a light-transmitting part; and a second embankment located below the first embankment. A lower surface of the first embankment located between the first side surface and the second side surface may be disposed above a side surface of the second embankment adjacent to the light-transmitting part. A recess may be disposed between the second side surface of the first embankment and a side surface of the second embankment.

[0143] In the light emitting display device according to one embodiment of the present disclosure, the second side surface of the first bank and the side surface of the second bank may have a forward tapered shape.

[0144] In the light emitting display device according to one embodiment of the present disclosure, the first bank and the second bank may include materials different from each other.

[0145] According to one embodiment of the present disclosure, a light-emitting display device may include: a substrate including a plurality of light-emitting portions and a light-transmitting portion located between the light-emitting portions; a dam structure disposed on the substrate and exposing each of the light-emitting portions and the light-transmitting portions; and a nucleation inhibition layer disposed at the light-transmitting portion on the substrate.

[0146] In the light-emitting display device according to one embodiment of the present disclosure, the nucleation inhibition layer may include a polycyclic aromatic hydrocarbon compound including organic molecules.

[0147] The light-emitting display device according to an embodiment of the present disclosure may further include an intermediate layer located on the plurality of light-emitting portions, the bank structure and the nucleation suppression layer. The thickness of the intermediate layer on the nucleation suppression layer may be smaller than the thickness of the intermediate layer on the plurality of light-emitting portions and the bank structure.

[0148] As is apparent from the foregoing, the light-emitting display device of the present disclosure has the following effects.

[0149] First, the light-emitting display device of the present disclosure minimizes the contact between the light-emitting parts of each of the plurality of sub-pixels by arranging the light-transmitting parts of each of the plurality of sub-pixels, thereby maximizing the path through which leakage current can flow between adjacent sub-pixels. Therefore, the light-emitting display device of the present disclosure has the effect of preventing light emission in some of the plurality of sub-pixels due to leakage current flowing from adjacent sub-pixels.

[0150] Second, the light-emitting display device disclosed in the present invention can prevent some of the multiple sub-pixels from emitting light due to leakage current flowing out from adjacent sub-pixels based on the bottom cut area adjacent to the light-transmitting part, and at the same time, can prevent the degradation and life reduction of the light-emitting element based on the uniform deposition of the intermediate layer formed in the light-emitting part.

[0151] Third, the light emitting display device of the present disclosure has a nucleation suppressing layer in a light transmitting portion to adjust the thickness of an intermediate layer deposited on the nucleation suppressing layer to a smaller level, thereby preventing leakage current from flowing to adjacent sub-pixels through the intermediate layer.

[0152] Fourth, the light-emitting display device of the present disclosure sets an undercut region in the transparent portion, thereby preventing leakage current from flowing between adjacent sub-pixels, preventing degradation and life reduction of the light-emitting element, and reducing power consumption and energy required for production. Therefore, the light-emitting display device of the present disclosure has an ESG (environment / social / governance) effect in terms of eco-friendliness, low power consumption, and process optimization.

[0153] It is obvious to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is intended to cover such modifications and variations as long as they fall within the scope of the appended claims and their equivalents.

[0154] These and other changes can be made to the embodiments in light of the above detailed description. Generally, in the appended claims, the terms used should not be interpreted as limiting the claims to the specific embodiments disclosed in the specification and claims, but should be interpreted as including all possible embodiments and the full range of equivalents granted by these claims. Therefore, the claims are not limited by this disclosure.

[0155] CROSS-REFERENCE TO RELATED APPLICATIONS

[0156] This application claims priority to Korean Patent Application No. 10-2023-0092549, filed on Jul. 17, 2023, which is hereby incorporated by reference as if fully set forth herein.

Claims

1. A light-emitting display device, comprising: a light-transmitting portion, the light-transmitting portion being located between the plurality of light-emitting portions; a first electrode located at each of the plurality of light emitting portions; a first bank exposing each of the light emitting portion and the light transmitting portion; an intermediate layer, the intermediate layer being located on the light emitting portion and the first bank; as well as a second electrode, the second electrode being located on the intermediate layer, wherein the first bank has a first side surface adjacent to one of the plurality of light emitting portions and a second side surface adjacent to the light transmitting portion, and The second side surface has an inverted tapered shape.

2. The light-emitting display device according to claim 1, wherein: The embankment structure includes an upper surface located between the first side surface and the second side surface, wherein the first side surface and the second side surface are inclined in a first direction, and The first side surface overlaps with a portion of the first electrode.

3. The light-emitting display device according to claim 1, wherein: The first side surface has a forward tapered shape.

4. The light-emitting display device according to claim 1, wherein: The embankment structure includes an upper surface located between the first side surface and the second side surface, wherein the first side surface is inclined in a first direction, and the second side surface is inclined in a second direction transverse to the first direction, and Wherein, the first side surface overlaps with the first electrode.

5. The light-emitting display device according to claim 1, further comprising a second bank portion, the second bank portion being adjacent to the first bank portion, in, A side surface of the second bank adjacent to one of the plurality of light emitting portions and a side surface adjacent to the light transmitting portion have a forward tapered shape.

6. The light-emitting display device according to claim 5, wherein: A lower surface of the first bank between the first side surface and the second side surface is disposed on a side surface of the second bank adjacent to the light transmitting portion.

7. The light-emitting display device according to claim 5, wherein: A vertical distance between a lower surface of the second bank and the first bank is greater than a thickness of the intermediate layer.

8. The light emitting display device according to claim 7, further comprising a dummy pattern, wherein the dummy pattern is located in the light transmitting portion. in, The dummy pattern is disposed in the same layer as at least one layer among a plurality of layers included in the intermediate layer, and Wherein, the dummy pattern and the intermediate layer are discontinuous.

9. The light-emitting display device according to claim 8, wherein: Each of the dummy pattern and the intermediate layer includes at least one charge generation layer, and The at least one charge generation layer of the dummy pattern is disposed in the same layer as the at least one charge generation layer of the intermediate layer. 10 . The light emitting display device according to claim 8 , further comprising a nucleation inhibiting layer located below the dummy pattern.

11. The light emitting display device according to claim 10, wherein: The dummy pattern includes an intermediate layer pattern, and The thickness of the intermediate layer pattern is smaller than the thickness of the intermediate layer.

12. The light-emitting display device according to claim 5, wherein: A lower surface of the first bank between the first side surface and the second side surface is disposed on an upper surface of the second bank.

13. The light emitting display device according to claim 12, wherein: The lower surface of the first bank is disposed at an edge of the upper surface of the second bank adjacent to the light transmitting portion.

14. The light emitting display device according to claim 6, wherein: The first side surface has an inverted tapered shape.

15. A light-emitting display device, comprising: a light-transmitting portion, the light-transmitting portion being located between the plurality of light-emitting portions; a light emitting element including a first electrode, a second electrode, and an intermediate layer between the first electrode and the second electrode at each of the light emitting portions; as well as a bank structure exposing each of the light emitting portion and the light transmitting portion, One side surface of the bank structure overlaps a portion of the first electrode, and the other side surface of the bank structure adjacent to the light transmission portion has a concave portion.

16. The light emitting display device according to claim 15, wherein: The embankment structure comprises: a first bank having a first side surface adjacent to one of the plurality of light emitting portions and a second side surface adjacent to the light transmitting portion; and a second embankment, the second embankment being adjacent to the first embankment, wherein a lower surface of the first bank portion located between the first side surface and the second side surface is disposed on a side surface of the second bank portion adjacent to the light transmission portion, and The recessed portion is provided between the second side surface of the first bank and the side surface of the second bank.

17. The light emitting display device according to claim 16, wherein: The second side surface of the first bank and the side surface of the second bank have a forward tapered shape.

18. The light emitting display device according to claim 16, wherein: The first bank and the second bank include materials different from each other.

19. A light-emitting display device, comprising: a substrate including a plurality of light emitting portions and a light transmitting portion located between the light emitting portions; a light emitting element including a first electrode, a second electrode, and an intermediate layer between the first electrode and the second electrode at each of the light emitting portions; as well as a bank structure disposed to overlap a portion of the first electrode and to expose each of the light emitting portion and the light transmitting portion; as well as A nucleation suppression layer is provided at the light transmission portion on the substrate.

20. The light emitting display device according to claim 19, wherein: The nucleation inhibition layer includes a polycyclic aromatic hydrocarbon compound including organic molecules.

21. The light-emitting display device according to claim 19, further comprising an intermediate layer, the intermediate layer being located on the plurality of light-emitting portions, the bank structure and the nucleation suppression layer, in, A thickness of the intermediate layer on the nucleation inhibiting layer is smaller than a thickness of the intermediate layer on the plurality of light emitting portions and the bank structure.

22. A light-emitting display device, comprising: A light-emitting element, comprising a first electrode, a second electrode, and an intermediate layer between the first electrode and the second electrode; a dam structure adjacent to the light emitting element, the dam structure having a first side surface, a second side surface opposite to the first side surface, and an upper surface located between the first side surface and the second side surface; a thin film transistor, the thin film transistor being electrically connected to the light emitting element, the thin film transistor overlapping the light emitting element; as well as a light-transmitting portion adjacent to the second side surface of the embankment structure, The intermediate layer is located on the upper surface of the embankment structure and is discontinuous between the second side surface of the embankment structure and the light transmission portion.

23. The light-emitting display device according to claim 22, wherein: The first side surface and the second side surface are inclined in a first direction.

24. The light-emitting display device according to claim 23, wherein: The intermediate layer or the second electrode extends continuously and continually from the light emitting element to the upper surface of the bank structure, and wherein the intermediate layer or the second electrode directly contacts the first side surface of the bank structure.

25. The light-emitting display device according to claim 23, further comprising: a dummy pattern, the dummy pattern being adjacent to the bank structure, the dummy pattern including the intermediate layer and the second electrode, wherein the intermediate layer of the dummy pattern is spaced apart from the intermediate layer on the upper surface of the bank structure.

26. The light-emitting display device according to claim 25, wherein: The second electrode of the dummy pattern is spaced apart from the second side surface of the bank structure.

27. The light-emitting display device according to claim 22, wherein: The first side surface is inclined in a first direction, and the second side surface is inclined in a second direction transverse to the first direction.

28. The light-emitting display device according to claim 27, further comprising a second bank structure on the upper surface of the bank structure or on the second side surface of the bank structure, in, The second embankment structure includes a first side surface, a second side surface opposite to the first side surface, and a lower surface located between the first side surface and the second side surface, and wherein the lower surface of the second embankment structure directly contacts the upper surface of the embankment structure or the second side surface of the embankment structure.

29. The light-emitting display device according to claim 28, wherein: The intermediate layer or the second electrode extends continuously and continually from the light emitting element to the upper surface of the bank structure and the first side surface of the second bank structure.

30. The light emitting display device according to claim 28, wherein: The intermediate layer or the second electrode directly contacts the first side surface of the second bank structure.

31. The light-emitting display device according to claim 28, wherein: The intermediate layer or the second electrode does not contact the second side surface of the second bank structure.

32. The light-emitting display device according to claim 28, further comprising: a dummy pattern, the dummy pattern being adjacent to the second bank structure, the dummy pattern including the intermediate layer and the second electrode, Wherein, at least one of the intermediate layer of the dummy pattern and the second electrode is spaced apart from the second side surface of the bank structure and the second side surface of the second bank structure.

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