Display panel and display apparatus

Abstract

To provide a display apparatus capable of improving performances including a light extraction efficiency of a light emitting element layer.SOLUTION: A display panel in an embodiment, can include a first subpixel and a second subpixel that are arranged on a substrate, the first subpixel is adjacent to the second subpixel, and the first subpixel includes a first light-emitting region, and the second subpixel includes a second light-emitting region. The display panel includes: a pixel electrode disposed in the first subpixel; and an insulation layer disposed between the pixel electrode and the substrate. The insulation layer includes a plurality of concave portions including a first concave portion and a second concave portion having a shape that is difference from the first concave portion. Also, the display panel may include: a pattern portion disposed between the first subpixel and the second subpixel; and a reflective portion overlapping with the pattern portion.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a display panel and a display device that display an image with improved light extraction efficiency and an improved viewing angle.

Background Art

[0002] An organic light-emitting display device has a high response speed, low power consumption, and is self-luminous without the need for a separate light source unlike a liquid crystal display device, so it has no problem with the viewing angle and is attracting attention as a next-generation flat panel display device.

[0003] Such a display device displays an image through the light emission of a light-emitting element layer including a light-emitting layer interposed between two electrodes.

[0004] On the other hand, in the display device, since part of the light emitted from the light-emitting element layer is not emitted to the outside due to total reflection at the interface between the light-emitting element layer and the electrode and / or the interface between the substrate and the air layer, the light extraction efficiency decreases.

[0005] There is also a problem that color mixing may occur between adjacent sub-pixels.

[0006] Therefore, there is a need to improve the light extraction efficiency of the display device.

[0007] There is also a need to prevent color mixing from occurring between adjacent sub-pixels of the display device.

[0008] Furthermore, there is a need for a display device that can be made thinner with a smaller number of layers, has improved brightness, and reduces the number of manufacturing steps.

Summary of the Invention

Problems to be Solved by the Invention

[0009] This specification aims to solve the technical problem of providing a display device capable of improving the light extraction efficiency of light emitted from a light-emitting element layer.

[0010] Furthermore, this specification aims to solve the technical problem of providing a display device capable of improving the viewing angle.

[0011] Also, this specification aims to solve the technical problem of providing a display device capable of maximizing the light extraction efficiency through light extraction in a non-light-emitting region.

[0012] Also, this specification aims to solve the technical problem of providing a display device capable of reducing the overall power consumption by increasing light extraction in a non-light-emitting region.

[0013] The problems to be solved by the examples in this specification are not limited to the above problems, and other problems not mentioned will be clearly understood by those with ordinary knowledge in the technical field to which the technical idea of this specification belongs from the following description.

Means for Solving the Problems

[0014] A display panel according to an example of this specification is disposed on a substrate, and includes a first sub-pixel having a first light-emitting region, a second sub-pixel disposed on the substrate adjacent to the first sub-pixel and having a second light-emitting region, a pixel electrode disposed in the first sub-pixel, an insulating layer disposed between the pixel electrode and the substrate and including a plurality of recesses including a first recess and a second recess having a shape different from that of the first recess, a pattern portion disposed between the first sub-pixel and the second sub-pixel, and a reflection portion overlapping the pattern portion.

[0015] A display panel according to an example of this specification can be configured such that the reflection portion redirects in the direction toward the substrate the light emitted from the first sub-pixel and passing through one of the plurality of recesses.

[0016] A display panel according to an example of this specification, wherein the pattern portion is a trench formed in the insulating layer, and the lowest surface of the trench is configured to be lower than the pixel electrode.

[0017] In a display panel according to an example of this specification, a trench surrounds at least a majority of the outer periphery of a pixel electrode of a first sub-pixel on a plane, and the trench is configured to be separated from the pixel electrode.

[0018] In a display panel according to an example of this specification, the cross-section of the trench is configured to have a "V" shape or a "U" shape in a non-light-emitting region between a first sub-pixel and a second sub-pixel.

[0019] In a display panel according to an example of this specification, a reflective portion is a part of a reflective electrode of a first sub-pixel that continuously extends across a patterned portion.

[0020] In a display panel according to an example of this specification, a first recess overlaps with an edge region of the pixel electrode, and a second recess overlaps with a central region of the pixel electrode.

[0021] In a display panel according to an example of this specification, the first recess in the edge region is configured to be wider than the second recess.

[0022] In a display panel according to an example of this specification, the second recess is configured to be wider than the first recess in the edge region.

[0023] In a display panel according to an example of this specification, the first depth of the first recess is configured to be different from the second depth of the second recess.

[0024] In a display panel according to an example of this specification, it further includes a bank located at an end of the pixel electrode and overlapping with an inclined surface of the patterned portion.

[0025] In a display panel according to an example of this specification, it further includes a light-emitting layer disposed in the first sub-pixel and directly contacting the inclined surface of the patterned portion.

[0026] A display panel according to an example of this specification includes a first layer in which an insulating layer has a first refractive index and a second layer in which the insulating layer has a second refractive index greater than the first refractive index, and the second layer is configured to be disposed between the pixel electrode and the first layer.

[0027] A display panel according to an example of this specification has a first recess that is one of a plurality of first recesses of a first sub-pixel and a second recess that is one of a plurality of second recesses of the first sub-pixel, and a first aspect ratio of the plurality of first recesses is configured to be different from a second aspect ratio of the plurality of second recesses.

[0028] A display device according to an example of this specification includes a display panel including a plurality of sub-pixels, a gate driver that supplies a gate signal to a gate line connected to the plurality of sub-pixels, and a data driver that supplies a data signal to a data line connected to the plurality of sub-pixels. The display panel is disposed on a substrate and includes a first sub-pixel having a first light-emitting region, a second sub-pixel having a second light-emitting region disposed on the substrate adjacent to the first sub-pixel, a pixel electrode disposed in the first sub-pixel, an insulating layer disposed between the pixel electrode and the substrate and including a plurality of recesses including a first recess and a second recess having a shape different from that of the first recess, a pattern portion disposed between the first sub-pixel and the second sub-pixel, and a reflection portion that overlaps the pattern portion.

[0029] A display device according to an example of this specification further includes a first data line electrically connected to the first sub-pixel through a connection portion of the pixel electrode. The pattern portion surrounds at least most of the outer periphery of the pixel electrode of the first sub-pixel on a plane. The pattern portion is separated from the pixel electrode. The connection portion of the pixel electrode does not cover the pattern portion on the plane and crosses between adjacent portions of the pattern portion. A part of the first data line is configured to intersect the pattern portion without covering most of the pattern portion on the plane.

[0030] A display device according to an example of this specification is configured such that the reflection portion emits light from the first sub-pixel and redirects light that has passed through one of the plurality of recesses in a direction toward the substrate.

[0031] A display device according to an example of this specification has a trench in which a pattern portion is formed in an insulating layer, and is configured such that the lowest surface of the trench is lower than the pixel electrode.

[0032] A display device according to an example of this specification is configured such that the trench surrounds at least most of the outer periphery of the pixel electrode of the first sub-pixel on a plane and the trench is separated from the pixel electrode.

[0033] A display device according to an example of this specification is configured such that a cross-section of the trench has a "V" shape or a "U" shape in a non-light-emitting region between the first sub-pixel and the second sub-pixel.

[0034] A display device according to an example of this specification has a reflection portion that is a part of a reflection electrode of a first sub-pixel that continuously extends across the pattern portion.

[0035] A display device according to an example of this specification is configured such that a first recess overlaps with an edge region of the pixel electrode and a second recess overlaps with a central region of the pixel electrode.

[0036] A display device according to an example of this specification is configured such that the first recess in the edge region is wider than the second recess.

[0037] A display device according to an example of this specification is configured such that the second recess is wider than the first recess in the edge region.

[0038] A display device according to an example of this specification is configured such that a first depth of the first recess is different from a second depth of the second recess.

[0039] A display device according to an example of this specification further includes a bank that is located at an end of the pixel electrode and overlaps with an inclined surface of the pattern portion.

[0040] A display device according to an example of this specification further includes a light-emitting layer that is disposed in the first sub-pixel and directly contacts the inclined surface of the pattern portion.

[0041] A display device according to an example of this specification includes a first layer having a first refractive index and a second layer having a second refractive index greater than the first refractive index, and the second layer is configured to be disposed between the pixel electrode and the first layer.

[0042] A display device according to an example of this specification is such that a first recess is one of a plurality of first recesses of a first sub-pixel, a second recess is one of a plurality of second recesses of the first sub-pixel, and a first aspect ratio of the plurality of first recesses is configured to be different from a second aspect ratio of the plurality of second recesses.

[0043] A display device according to an example of this specification further includes a first data line electrically connected to the first sub-pixel, and the first data line is configured not to overlap with the pixel electrode.

[0044] A display device according to an example of this specification includes a first sub-pixel disposed on a substrate and having a first light-emitting region, a second sub-pixel disposed adjacent to the first sub-pixel on the substrate and having a second light-emitting region, a pixel electrode disposed in the first sub-pixel, an insulating layer disposed between the pixel electrode and the substrate and including a plurality of recesses including a first recess and a second recess having a shape different from that of the first recess, a pattern portion disposed between the first sub-pixel and the second sub-pixel, a display panel including a reflection portion overlapping the pattern portion, a gate driver configured to supply a gate signal to a gate line connected to the first sub-pixel and the second sub-pixel, and a data driver configured to supply a data signal to a data line connected to the first sub-pixel and the second sub-pixel.

[0045] A display device according to an example of this specification further includes a power supply line connected to the first sub-pixel, the pattern portion surrounds at least most of the outer periphery of the pixel electrode in the first sub-pixel on a plane, the pattern portion is spaced apart from the pixel electrode, a part of the power supply line crosses the pattern portion without covering most of the pattern portion on the plane, and a part of the first data line connected to the first sub-pixel intersects the pattern portion without covering most of the pattern portion on the plane.

Advantages of the Invention

[0046] The display panel according to this specification is arranged on a substrate, includes a first sub-pixel having a first light-emitting region, a second sub-pixel having a second light-emitting region and arranged on the substrate adjacent to the first sub-pixel, a pixel electrode arranged in the first partial pixel, an insulating layer including a plurality of recesses arranged between the pixel electrode and the substrate and including a first recess and a second recess having a shape different from that of the first recess, a pattern part arranged between the first sub-pixel and the second sub-pixel, and a reflection part overlapping with the pattern part. By being configured in this way, the light extraction efficiency of the light emitted by the light-emitting element layer can be improved.

[0047] The display device according to this specification includes a display panel including a plurality of sub-pixels, a gate driver that supplies a gate signal to a gate line connected to the plurality of sub-pixels, and a data driver that supplies a data signal to a data line connected to the plurality of sub-pixels. The display panel is arranged on a substrate, includes a first sub-pixel having a first light-emitting region, a second sub-pixel having a second light-emitting region and arranged on the substrate adjacent to the first sub-pixel, a pixel electrode arranged in the first sub-pixel, and an insulating layer including a plurality of recesses arranged between the pixel electrode and the substrate and including a first recess and a second recess having a shape different from that of the first recess. And by being configured to include a pattern part arranged between the second sub-pixels and a reflection part overlapping with the pattern part, the amount of light reaching the reflection part can be increased, and the viewing angle can be improved compared with the case where the first recess and the second recess are formed to have the same size.

[0048] The display device according to this specification is configured such that the reflection part deflects the light emitted from the first sub-pixel and passing through one of the plurality of recesses in the direction toward the substrate, so that the light extraction efficiency in the non-light-emitting region can be maximized.

[0049] The display device according to this specification can have the same luminous efficiency as or higher luminous efficiency than a display device without a reflection part even at low power, and can reduce the overall power consumption.

[0050] The effects obtained in this specification are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those with ordinary knowledge in the technical field to which this specification belongs from the following description.

Brief Description of the Drawings

[0051]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Modes for Carrying Out the Invention

[0052] The advantages and features of this specification, as well as the methods for achieving them, will become apparent by referring to the embodiments described in detail hereinafter together with the accompanying drawings. However, this specification is not limited to the embodiments disclosed below, but is configured in various different forms, and the embodiments are merely provided to make the disclosure of this specification complete and to fully inform those with ordinary knowledge in the technical field to which this specification pertains of the scope of the invention.

[0053] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of this specification are exemplary, and this specification is not limited to the matters shown in the drawings. Throughout the specification, the same reference numerals refer to the same components. In addition, in the description of this specification, when it is determined that a specific description of related known technologies may unnecessarily obscure the gist of this specification, the detailed description thereof will be omitted.

[0054] When terms such as "comprising", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, it includes the case of including a plurality unless there are specific descriptions.

[0055] In interpreting a component, even if there is no separate explicit description regarding the error range, it is interpreted as including the error range.

[0056] In the case of an explanation of a positional relationship, for example, when the positional relationship between two parts is explained by "on ~", "above ~", "below ~", "beside ~", etc., unless the expressions "immediately" or "directly" are used, one or more other parts may also be positioned between the two parts.

[0057] In the case of an explanation regarding the relationship of time, for example, when the chronological relationship is explained using expressions such as "after ~", "subsequent to ~", "next to ~", "before ~", etc., unless the expressions "immediately" or "directly" are used, it may include cases that are not continuous.

[0058] The first, second, etc. are used to explain various components, but these components are not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical idea of this specification.

[0059] The "X-axis direction", "Y-axis direction", and "Z-axis direction" should not be interpreted as only having a geometric relationship perpendicular to each other, and may mean having a broader direction within the range where the configuration of this specification can function effectively.

[0060] The term "at least one" must be understood to include all combinations that can be presented from one or more related items. For example, the meaning of "at least one of the first item, the second item, and the third item" may mean each of the first item, the second item, or the third item, as well as all combinations of two or more items that can be presented from among the first item, the second item, and the third item.

[0061] The features of each of several embodiments of this specification can be partially or wholly combined or combined with each other, enabling various technical linkages and drives, and each embodiment can be implemented independently of each other or can be implemented together in an associated relationship.

[0062] Hereinafter, preferred embodiments of this specification will be described in detail with reference to the accompanying drawings. All components of each display device according to all embodiments of the present invention are configured to be operably coupled.

[0063] FIG. 1 is a schematic plan view of a display device according to an embodiment of the present specification, FIG. 2 is a schematic plan view showing one pixel shown in FIG. 1, and FIG. 3 is a schematic cross-sectional view taken along line I-I' shown in FIG. 2.

[0064] Hereinafter, with reference to FIG. 2, the first direction (for example, the X-axis direction) indicates the direction in which the gate line (GL) is arranged horizontally and long, the second direction (for example, the Y-axis direction) indicates the direction in which the data line (for example, the first data line (DL1)) is arranged vertically and long, and the third direction (for example, the Z-axis direction) is the direction intersecting with each of the first direction (X-axis direction) and the second direction (Y-axis direction), and indicates the thickness direction of the display device 100.

[0065] Referring to FIGS. 1 to 3, a display device 100 according to an embodiment of the present specification includes a substrate 110 having a plurality of pixels (P) having a plurality of sub-pixels (SP), a pattern portion 120 formed in a concave shape between the plurality of sub-pixels (SP) disposed on the substrate 110, and a reflection portion 130 disposed obliquely on the pattern portion 120.

[0066] The plurality of sub-pixels (SP) may include a plurality of recesses 140 disposed apart from the reflection portion 130 on the substrate 110. The plurality of recesses 140 according to an example may include a first recess 141 disposed adjacent to the pattern portion 120, and a second recess 142 connected to the first recess 141 and disposed further apart from the pattern portion 120 than the first recess 141. For example, the second recess 142 may be disposed further apart from the pattern portion 120 in the first direction (X-axis direction) than the first recess 141. The first recess 141 may be configured to have a different size from the second recess 142. For example, the aspect ratio of the first recess 141 may be configured to be smaller than the aspect ratio of the second recess 142. For example, the first recess 141 may be wider and larger than the second recess 142. Also, the depth of the first recess 141 may be the same as or substantially the same as the depth of the second recess 142. For example, the depth of the first recess 141 may be different from the depth of the second recess 142.

[0067] Referring to FIG. 4, the aspect ratio of the first recess 141 according to an example can be the ratio of the first vertical length (H1) from the center (C1) of the first recess to the outer contour of the first recess 141 to the first radius (R1) of the first recess 141. The outer contour of the first recess 141 can, with reference to FIG. 4, mean a surface formed in a lens shape at the interface between the first layer 1131 and the second layer 1132 of the overcoat layer 113 (for example, the interface can be located on the upper surface or the uppermost surface of the first layer 1131). Also, the overcoat layer 113 can be called an insulating layer. The first vertical length (H1) is the vertical length from the center (C1) of the first recess 141 to the outer contour of the first recess 141 and can be a direction parallel to the third direction (Z-axis direction). The first radius (R1) of the first recess 141 is the horizontal length from the center (C1) of the first recess 141 to the outer contour of the first recess 141 and can be a direction parallel to the first direction (X-axis direction).

[0068] The aspect ratio of the second recess 142 according to an example can be the ratio of the second vertical length (H2) from the center (C2) of the second recess to the outer contour of the second recess 142 to the second radius (R2) of the second recess 142. The outer contour of the second recess 142 is connected to the outer contour of the first recess 141 and can, with reference to FIG. 4, mean a surface formed in a lens form at the interface between the first layer 1131 and the second layer 1132 of the overcoat layer 113. The second vertical length (H2) is the vertical length from the center (C2) of the second recess 142 to the outer contour of the second recess 142 and can be a direction parallel to the third direction (Z-axis direction). The second radius (R2) of the second recess 142 is the horizontal length from the center (C2) of the second recess 142 to the outer contour of the second recess 142 and can be a direction parallel to the first direction (X-axis direction).

[0069] The reason why the aspect ratio of the first recess 141 is configured to be smaller than the aspect ratio of the second recess 142 is to allow more light that is emitted from each of the plurality of sub-pixels (SP) and incident on the first recess 141 to reach the reflecting portion 130. That is, when the first recess 141 at the end of the light-emitting region is wider than the second recess 142, more light can reach the reflecting portion 130 and be reflected outside the device, so that the luminance and the light extraction efficiency can be improved. For example, when the aspect ratio of the first recess 141 is smaller than the aspect ratio of the second recess 142, the length (CL1, shown in FIG. 4) of the left outer contour of the first recess 141 with respect to the center (C1) of the first recess 141 can be longer than the length (CL2, shown in FIG. 4) of the left outer contour of the second recess 142 with respect to the center (C2) of the second recess 142. Therefore, the amount of light refracted by the reflecting portion 130 (or the left reflecting portion) through the left outer contour of the first recess 141 having a longer length (or area) than the second recess 142 can increase for the light incident on the first recess 141.

[0070] Since FIG. 4 is an enlarged view of the left side portion of the sub-pixel (SP), the right side portion of the sub-pixel (SP) can be configured such that the length of the right outer contour of the first recess 141 with respect to the center (C1) of the first recess 141 is longer than the length of the right outer contour of the second recess 142 with respect to the center (C2) of the second recess 142. Therefore, the amount of light refracted by the reflecting portion 130 (or the right reflecting portion) through the right outer contour of the first recess 141 having a longer length (or area) than the second recess 142 can increase for the light incident on the first recess 141. That is, the larger first recess 141 can be disposed around the end or the periphery or the edge region (EDA) of the pixel electrode 114 so that more light is extracted outside the device, and the smaller second recess 142 can be located inside, for example, surrounded by the first recess 141.

[0071] Therefore, in the display device 100 according to an embodiment of the present specification, since the aspect ratio of the first recess 141 is configured to be smaller than the aspect ratio of the second recess 142, the amount of light reaching the reflection unit 130 can be increased compared to the case where the first recess and the second recess are formed with the same aspect ratio (or the same size). Thus, the extraction efficiency of the light emitted to the outside of the substrate 110 (or the light extraction efficiency of the reflected light (L1)) can be further improved.

[0072] In addition, in the display device 100 according to an embodiment of the present specification, since the aspect ratio of the first recess 141 is configured to be smaller than the aspect ratio of the second recess 142, the amount of light emitted to the side through the reflection unit 130 can be increased compared to the case where the first recess and the second recess are formed with the same aspect ratio (or the same size or the same width), and the viewing angle can be improved.

[0073] In the display device 100 according to an embodiment of the present specification, the first radius (R1) of the first recess 141 may be larger than the second radius (R2) of the second recess 142, and the first vertical length (H1) of the first recess 141 may be equal to the second vertical length (H2) of the second recess 142. Therefore, the aspect ratio of the first recess 141 may be smaller than the aspect ratio of the second recess 142.

[0074] On the other hand, in the display device 100 according to an embodiment of the present specification, the width (W) of the edge region (EDA) where at least a part of the first recess 141 is overlapped and arranged can be determined by a mathematical formula. For example, the width (W) of the edge region (EDA) can be derived by a mathematical formula related to the vertical distance from the organic light-emitting layer 116 to the substrate 110 and the maximum angle at which the light emitted from the organic light-emitting layer 116 is emitted to the outside of the substrate 110 without total reflection on the upper surface 110a of the substrate 110. This will be described later in connection with the mathematical formula and FIG. 4.

[0075] According to an embodiment of the present specification, the display device 100 is configured such that at least a part of the first recess 141 is disposed (or disposed in an overlapping manner) in the edge region (EDA), so that the amount of light refracted to the reflecting portion 130 through the first recess 141 can be increased, and the light extraction efficiency can be maximized. An example of the edge region (EDA) is a region including an end portion of the light emitting region (EA), and may be a region surrounding the center region (ECA) of the sub-pixel.

[0076] Hereinafter, with reference to FIGS. 1 to 3, the display device 100 according to an embodiment of the present specification will be described in more detail.

[0077] Each of a plurality of sub-pixels (SP) according to an example may include a light emitting region (EA), a non-light emitting region (NEA) adjacent to the light emitting region (EA), and a plurality of recesses 140 at least a part of which overlaps the light emitting region (EA).

[0078] The light emitting region (EA) is a region where light is emitted, and may be included in the display region (DA). As shown in FIG. 3, the light emitting region (EA) may be disposed at a distance from the pattern portion 120. For example, the pattern portion 120 may have a shape or form similar to a trench, a recess, or a moat surrounding or mostly surrounding each sub-pixel. Since the reflecting portion 130 is disposed on the pattern portion 120 (for example, a trench), the light emitting region (EA) may be disposed at a distance from the reflecting portion 130. For example, the light emitting region (EA) may be disposed at a first distance (D1, for example, shown in FIG. 4) from the reflecting portion 130. The first distance (D1) is the shortest horizontal distance between the light emitting region (EA) and the reflecting portion 130, and may be in a direction parallel to the first direction (X-axis direction). For example, the first distance (D1) may be the distance from the point where the organic light emitting layer 116 contacts the edge region of the pixel electrode 114 to the point on the lower surface of the reflecting portion 130 in the region overlapping the trench or the pattern portion 120 (for example, see FIG. 4).

[0079] The non-emitting region (NEA) is a region where light does not emit and can be a region adjacent to the emitting region (EA). The non-emitting region (NEA) can be represented by the term peripheral region. The reflecting part 130 can be arranged in the non-emitting region (NEA) at a distance from the plurality of concave parts 140 (or the emitting region (EA)) (for example, the region between adjacent sub-pixels).

[0080] Therefore, in the display device 100 according to an embodiment of the present specification, the reflecting part 130 arranged in the non-emitting region (NEA) can reflect the light among the light emitted in the emitting region (EA) and directed toward the adjacent sub-pixels toward the emitting sub-pixel (SP). Thus, the light efficiency (or light extraction efficiency) of the emitting sub-pixel (SP) can be improved, and color mixing between adjacent sub-pixels can be prevented.

[0081] On the other hand, according to an example, the reflecting part 130 can be arranged to be inclined on the pattern part 120 (for example, a concave part or a trench) in the non-emitting region (NEA). Therefore, among the light refracted by the plurality of concave parts 140, the light directed toward the reflecting part 130 can be reflected by the inclined reflecting part 130 and emitted to the outside of the substrate 110 (for example, toward the user's eyes outside the display device).

[0082] According to one example, the non-emitting area (NEA) may include a first area (A1) adjacent to the emitting area (EA) and a second area (A2) adjacent to the first area (A1) and spaced apart from the emitting area (EA). According to one example, the first area (A1) may be a bank area where the bank 115 (or the bank 115 covering the end of the pixel electrode 114) defining the emitting area (EA) is disposed. For example, the bank 115 may be disposed on the opposite side of the pattern portion 120 (e.g., the opposite side of the trench / recess). In such a manner, the height of the reflective inclined portion of the reflective portion 130 can be increased, and the inclination can be adjusted or made steeper so that more light can be controlled to be reflected outside the device. According to one example, the second area (A2) may be a bank-less area where the bank 115 is not disposed in the non-emitting area (NEA) (e.g., the area between the trenches or on the opposite side of the pattern portion 120). According to another example, the first area (A1) may be an area adjacent to the emitting area (EA) and where the second layer 1132 of the overcoat layer 113 is partially disposed, as shown in FIG. 5. According to another example, the second area (A2) may be an area adjacent to the first area (A1) and where the organic light-emitting layer 116 contacts the bottom surface 120b of the pattern portion 120, as shown in FIG. 5. For example, the second area (A2) may correspond to the exposed bottom surface of the trench or the pattern portion 120 (e.g., the bottom exposed by the bank or the bottom exposed by the second layer 1132 of the overcoat layer 113 according to the embodiment).

[0083] Referring back to FIG. 3, the pattern portion 120 according to an example may be formed in a concave shape in a non-emitting region (NEA) (e.g., a concave portion, an arc, or a trench configuration). For example, the pattern portion 120 may be formed in a concave shape in the overcoat layer 113 on the substrate 110. For example, the pattern portion 120 may be formed by etching or digging the upper surface of the overcoat layer 113, but is not limited thereto. The pattern portion 120 may be a kind of trench that partially surrounds or surrounds the sub-pixel. The pattern portion 120 may be disposed at a distance from the light-emitting region (EA). The pattern portion 120 according to an example may be configured to surround the light-emitting region (EA) in the form of a slit or a trench. According to another embodiment, the pattern portion 120 may be a kind of opening that extends completely through the overcoat layer 113 to expose the underlying layer. For example, the width of the pattern portion 120 may be formed to decrease as it goes in the direction toward the substrate 110 in the reflection portion 130 (e.g., the cross-section of the pattern portion 120 may have a tapered shape opposite to the substrate). Also, as shown in FIG. 3, the pattern portion 120 may include an exposed region (e.g., the upper surface of the first layer 1131) of the overcoat layer 113 that is not covered by the bank 115. Therefore, the pattern portion 120 may be expressed in terms of home, slit, concave portion, arc, trench, bank slit, bank trench. However, it is not limited thereto. As shown in FIG. 3, the pattern portion 120 may include an inclined surface 120s formed in the first region (A1) and a bottom surface 120b extending from the inclined surface 120s to the second region (A2). The bottom surface 120b may be flat, but the embodiment is not limited thereto. For example, according to another embodiment, the bottom surface 120b may be concave.

[0084] According to one example, the reflective portion 130 may be formed in a concave shape along the profile of the pattern portion 120 formed in a concave shape in the non-emitting region (NEA), so as to be inclined with respect to the non-emitting region (NEA) (for example, the cross-section of the reflective portion 130 may form a kind of "V" shape between adjacent sub-pixels). Since the reflective portion 130 is composed of a substance capable of reflecting light, the light emitted in the light-emitting region (EA) can be reflected toward the light-emitting region (EA) that emits light and travels toward the adjacent sub-pixel (SP). That is, the reflective portion 130 can change the direction of the light traveling toward the adjacent sub-pixel and change the path so as to be reflected outside the display device (for example, it can prevent color mixing and improve the light extraction efficiency). As shown in FIG. 3, since the reflective portion 130 is disposed inclined on the pattern portion 120 while surrounding the light-emitting region (EA), it can be expressed by terms such as a side reflective portion, an inclined reflective portion, or a reflective inclined portion.

[0085] Additionally, the display device 100 according to an embodiment of the present specification may be configured as bottom emission in which the light emitted in the light-emitting region (EA) is emitted to the lower surface of the substrate 110. Therefore, as shown in FIG. 3, in the display device 100 according to an embodiment of the present specification, the light emitted to the lower surface of the substrate 110 is the reflected light (L1) that is emitted in the light-emitting region (EA), refracted by at least one recess 140, reflected by the reflective portion 130, and then emitted to the lower surface of the substrate 110, and the direct light (L2) that is emitted in the light-emitting region (EA), refracted by at least one recess 140, and directly emitted to the lower surface of the substrate 110. That is, the small second recess 142 that overlaps with the intermediate region of the sub-pixel can help align or generate more direct light (L2) that directly travels toward the user's eyes, while the larger first recess 141 removes the light that escapes in the side direction, changes the direction, or converts it into reflected light (L1) and can be located at or around the edge of the sub-pixel so as to travel toward the user's eyes. Thereby, the display device 100 according to an embodiment of the present specification can further improve the light extraction efficiency and prevent color mixing between adjacent sub-pixels as compared with a display device having no reflective portion 130 disposed in an inclined manner.

[0086] Referring to FIGS. 1 and 2, a display device 100 according to an embodiment of the present specification may further include a display panel including a gate driving unit (GD), a plurality of recesses 140 at least partially overlapping with a light emitting region (EA), a source drive integrated circuit (hereinafter referred to as "IC") 150, a flexible film 160, a circuit board 170, and a timing control unit 180.

[0087] The display panel may include a substrate 110 and a counter substrate 200 (shown in FIG. 3).

[0088] The substrate 110 includes a thin film transistor and may be a transistor array substrate, a lower substrate, a base substrate, or a first substrate. The substrate 110 may be a transparent glass substrate or a transparent plastic substrate. The substrate 110 may include a display area (DA) and a non-display area (NDA).

[0089] The display area (DA) is an area where an image is displayed and may be a pixel array area, an active area, a pixel array unit, a display unit, or a screen. For example, the display area (DA) may be disposed at a central portion of the display panel. The display area (DA) may include a plurality of pixels (P).

[0090] The counter substrate 200 may seal (or encapsulate) the display area (DA) disposed on the substrate 110. For example, the counter substrate 200 may be opposed and attached to the substrate 110 via an adhesive member (or a transparent adhesive). The counter substrate 200 may be an upper substrate, a second substrate, or a sealing substrate.

[0091] The gate driving unit (GD) supplies a gate signal to a gate line in response to a gate control signal input from the timing control unit 180. The gate driving unit (GD) may be formed in a GIP (gate driver in panel) method on one side of the light emitting region (EA) or in a non-light emitting region (NEA) of the outer periphery on both sides of the light emitting region (EA) as shown in FIG. 1.

[0092] The non-display area (NDA) is an area where an image is not displayed, and can be a peripheral area, a signal supply area, an inactive area, or a bezel area. The non-display area (NDA) can be configured to be around the display area (DA). That is, the non-display area (NDA) can be arranged to surround the display area (DA).

[0093] A pad portion (PA) can be arranged in the non-display area (NDA). The pad portion (PA) can supply power and / or signals for pixels (P) configured in the display area (DA) to output an image. Based on FIG. 1, the pad portion (PA) can be configured above the display area (DA).

[0094] The source drive IC 150 receives an input of digital video data and a source control signal from the timing control unit 180. The source drive IC 150 converts the digital video data into an analog data voltage according to the source control signal and supplies it to the data line. Therefore, the data line can supply data signals to each of a plurality of sub-pixels. When the source drive IC 150 is manufactured as a drive chip, it can be mounted on the flexible film 160 by a COF (chip on film) or COP (chip on plastic) method.

[0095] Pads such as data pads can be formed in the non-display area (NDA) of the display panel. The flexible film 160 can form wirings connecting the pads and the source drive IC 150, and wirings connecting the pads and the wirings of the circuit board 170. The flexible film 160 can be attached onto the pads using an anisotropic conductive film, thereby connecting the pads and the wirings of the flexible film 160.

[0096] The circuit board 170 can be attached to the flexible film 160. The circuit board 170 can mount a plurality of circuits configured as drive chips. For example, the timing control unit 180 can be mounted on the circuit board 170. The circuit board 170 can be a printed circuit board or a flexible printed circuit board.

[0097] The timing control unit 180 receives the input of digital video data and a timing signal from an external system board via a cable of the circuit board 170. The timing control unit 180 generates a gate control signal for controlling the operation timing of the gate driver unit (GD) based on the timing signal, and a source control signal for controlling the source drive IC 150. The timing control unit 180 supplies the gate control signal to the gate driver unit (GD) and supplies the source control signal to the source drive IC 150.

[0098] Referring to FIG. 3, a substrate 110 according to an example may include a light-emitting region (EA) and a non-light-emitting region (NEA).

[0099] The light-emitting region (EA) is a region where light is emitted, and may mean a region not blocked by the bank 115. In the light-emitting region (EA), a light-emitting element layer (E) including a pixel electrode 114, an organic light-emitting layer 116, and a reflective electrode 117 may be disposed. When an electric field is formed between the pixel electrode 114 and the reflective electrode 117, the organic light-emitting layer 116 in the light-emitting region (EA) may emit light. On the other hand, the light-emitting region (EA) may have the same or a similar shape to the shape of the pixel electrode 114. This is because light can be emitted from the organic light-emitting layer 116 by the formation of an electric field between the pixel electrode 114 and the reflective electrode 117. Since the region where light is emitted is the light-emitting region (EA), the light-emitting region (EA) may be formed along the shape of the pixel electrode 114. A pattern portion 120 according to an example (for example, a trench or a recess) is configured to surround the light-emitting region (EA), and as a result, the pattern portion 120 may be formed along the shape of the pixel electrode 114. For example, the pattern portion 120 may extend around the outer contour of the pixel electrode 114 at a distance from the pixel electrode 114. The light-emitting region (EA) may include an edge region (EDA) and a center region (ECA).

[0100] An edge region (EDA) according to one example can be a region disposed adjacent to the reflective portion 130 in the non-emitting region (NEA). A center region (ECA) according to one example can be a region disposed further away from the reflective portion 130 than the edge region (EDA). As shown in FIG. 3, the center region (ECA) can be a region including the center of the light-emitting region (EA). Also, the edge region (EDA) is a region including the edge of the light-emitting region (EA) and can be a region surrounding the center region (ECA).

[0101] In the display device 100 according to an embodiment of the present specification, at least a part of a first recess 141 according to one example can be disposed to overlap with the edge region (EDA). In FIG. 3, only one first recess 141 that partially overlaps with the edge region (EDA) is shown, but depending on the aspect ratio of the first recess 141, at least one or more (or a plurality of) first recesses 141 can be disposed to overlap with the edge region (EDA). A second recess 142 according to one example can be disposed to overlap with the center region (ECA). As shown in FIG. 3, the second recess 142 can be disposed to overlap at least one or more (or a plurality of) with the center region (ECA). However, it is not limited thereto, and only one second recess 142 can be disposed to overlap with the center region (ECA).

[0102] As described above, the first recess 141 can be configured to have an aspect ratio smaller than that of the second recess 142. Therefore, the display device 100 according to an embodiment of the present specification can increase the amount of light reaching the reflective portion 130 disposed to be inclined on the pattern portion 120, and can improve the viewing angle and / or light extraction efficiency compared to the case where the first recess and the second recess are formed with the same aspect ratio (or the same size), and can better prevent color mixing between adjacent sub-pixels. Also, by configuring the reflective portion 130 and the pattern portion 120, additional layers and components such as an additional black matrix can be omitted or made smaller, and the display device can be thinned, the light extraction can be improved, and color mixing can be prevented.

[0103] Referring back to FIG. 2, an exemplary light-emitting region (EA) may include a gate line, a data line, a pixel driving power line, and a plurality of pixels (P). Each of the plurality of pixels (P) may include a plurality of sub-pixels (SP) that may be defined by the gate line and the data line.

[0104] On the other hand, among the plurality of sub-pixels (SP), at least four sub-pixels configured to emit different colors and arranged adjacent to each other may constitute one pixel (P) (or a unit pixel). One pixel (P) may include, but is not limited to, a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. One pixel (P) may be composed of three sub-pixels (SP) configured to emit different colors and arranged adjacent to each other. For example, one pixel (P) may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0105] Each of the plurality of sub-pixels (SP) may include a thin-film transistor and a light-emitting element layer (E) connected to the thin-film transistor. Each of the plurality of sub-pixels may include a light-emitting layer (or an organic light-emitting layer) interposed between a pixel electrode and a reflective electrode.

[0106] The light-emitting layers disposed in each of the plurality of sub-pixels (SP) may commonly emit white light. Since the light-emitting layers of each of the plurality of sub-pixels (SP) commonly emit white light, each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel may include a color filter (CF) (or a wavelength conversion member (CF)) that converts white light into different color lights. In this case, the white sub-pixel may not constitute a color filter.

[0107] In the display device 100 according to an embodiment of the present specification, the region where the red color filter is formed may be a red sub-pixel or a first sub-pixel, the region where the green color filter is formed may be a green sub-pixel or a second sub-pixel, the region where the blue color filter is formed may be a blue sub-pixel or a third sub-pixel, and the region where no color filter is formed may be a white sub-pixel or a fourth sub-pixel.

[0108] When a gate signal is input from a gate line to each of the sub-pixels (SP) using a thin film transistor, a predetermined current is supplied to the organic light emitting element according to the data voltage of the data line. As a result, the light emitting layer of each sub-pixel can emit light with a predetermined brightness by a predetermined current.

[0109] A plurality of sub-pixels (SP) according to an example may be arranged adjacent to each other in a first direction (X-axis direction). The plurality of sub-pixels (SP) may include a first sub-pixel (SP1), a second sub-pixel (SP2), a third sub-pixel (SP3), and a fourth sub-pixel (SP4) arranged adjacent to each other (or in order) in the first direction (X-axis direction). For example, the first sub-pixel (SP1) may be a red sub-pixel, the second sub-pixel (SP2) may be a white sub-pixel, the third sub-pixel (SP3) may be a blue sub-pixel, and the fourth sub-pixel (SP4) may be a green sub-pixel. However, it is not necessarily limited to this, and the arrangement order of the first sub-pixel (SP1), the second sub-pixel (SP2), the third sub-pixel (SP3), and the fourth sub-pixel (SP4) may be changed.

[0110] Each of the first to fourth sub-pixels (SP1 to SP4) may include a light emitting region (EA) and a circuit region. The light emitting region (EA) is arranged on one side (or the upper side) of the sub-pixel region, and the circuit region (CA) may be arranged on the other side (or the lower side) of the sub-pixel region. For example, as shown in FIG. 2, the circuit region (CA) may be arranged below the light emitting region (EA) with respect to the second direction (Y-axis direction). The light emitting regions (EA) of the first to fourth sub-pixels (SP1 to SP4) may have the same size (or area) or different sizes (or areas) from each other.

[0111] Each of the first to fourth sub-pixels (SP1 to SP4) can be arranged adjacent to each other along the first direction (X-axis direction). For example, between the first sub-pixel (SP1) and the second sub-pixel (SP2), and between the third sub-pixel (SP3) and the fourth sub-pixel (SP4), two data lines extending along the second direction (Y-axis direction) can be arranged parallel to each other. A pixel power line (EVDD) extending along the first direction (X-axis direction) can be arranged between the light-emitting region (EA) and the circuit region of each of the first to fourth sub-pixels (SP1 to SP4). The gate line (GL) and the sensing line (SL) can be arranged under the circuit region (CA). A pixel power line (EVDD, shown in FIG. 2) extending along the second direction (Y-axis direction) can be arranged on one side of the first sub-pixel (SP1) or the fourth sub-pixel (SP4). A reference line (RL) that is long in the second direction (Y-axis direction) can be configured between the second sub-pixel (SP2) and the third sub-pixel (SP3). The reference line (RL) can be used as a sensing line for externally sensing changes in the characteristics of the driving thin-film transistor arranged in the circuit region (CA) and / or changes in the characteristics of the light-emitting element layer during the sensing driving mode of the pixel (P). As shown in FIG. 2, at least a part of the reference line (RL) according to an example can overlap with the pattern portion 120. The data lines can include a first data line (DL1) for driving the first sub-pixel (SP1), a second data line (DL2) for driving the second sub-pixel (SP2), a third data line (DL3) for driving the third sub-pixel (SP3), and a fourth data line (DL4) for driving the fourth sub-pixel (SP4).

[0112] In the display device 100 according to an embodiment of the present specification, a data line, for example, the first data line (DL1), may be arranged so as not to overlap with the light emitting region (EA) and the reflecting portion 130 (or reflecting portion 117a) on the pattern portion 120. For example, as shown in FIG. 3, the first data line (DL1) may be arranged to overlap with the first region (A1). Therefore, in the display device 100 according to an embodiment of the present specification, since the first data line (DL1) does not block (or interfere with) the light reflected by the reflecting portion 130 (or reflecting portion 117a), a decrease in light extraction efficiency can be prevented. The second data line (DL2), the third data line (DL3), and the fourth data line (DL4) may be arranged in the first region (A1) of the corresponding sub-pixel so as not to overlap with the light emitting region (EA) of the corresponding sub-pixel and the reflecting portion 117a in the third direction (Z-axis direction), similar to the first data line (DL1). Therefore, in the display device 100 according to an embodiment of the present specification, the data lines (DL1, DL2, DL3, DL4) may have a structural feature of not overlapping with the pattern portion 120. That is, since the wiring does not block much of the light reflected by the configuration of the reflecting portion 130 and the pattern portion 120, the configuration of the reflecting portion 130 and the pattern portion 120 may be separated without overlapping with each other in a plane mainly with respect to the wiring (for example, RL, DL, EVDD, etc.) (see, for example, FIG. 2).

[0113] However, it is not necessarily limited thereto. The first data line (DL1) according to another example may partially overlap with the inclined surface 120s of the pattern portion 120 between the first sub-pixel (SP1) and the second sub-pixel (SP2). The second data line (DL2) may partially overlap with the bottom surface 120b of the pattern portion 120 between the first sub-pixel (SP1) and the second sub-pixel (SP2). The pixel power supply line (EVDD) or the reference line (RL) may partially overlap with the bottom surface 120b and the inclined surface 120s of the pattern portion 120.

[0114] In the display device 100 according to an embodiment of the present specification, each of the data lines (DL1, DL2, DL3, DL4) can be arranged long in a second direction (Y-axis direction) intersecting the first direction (X-axis direction) among a plurality of sub-pixels (SP) arranged in the first direction (X-axis direction). As shown in FIG. 2, the pattern portion 120 according to an example can be partially superimposed on the data lines (DL1, DL2, DL3, DL4) in the first direction (X-axis direction) and the second direction (Y-axis direction). This is because, as shown in FIG. 2, the pattern portion 120 is arranged so as to surround most of the light-emitting region (EA).

[0115] In the display device 100 according to an embodiment of the present specification, each of the plurality of sub-pixels (SP) can include a plurality of recesses 140. The plurality of recesses 140 can be formed in the overcoat layer 113 so as to partially overlap with the light-emitting region (EA) of the sub-pixel. The plurality of recesses 140 are formed in the overcoat layer 113 of the light-emitting region (EA) so as to have a bent (or uneven) shape, thereby changing the traveling path of the light emitted from the light-emitting element layer (E) and increasing the light extraction efficiency. For example, the plurality of recesses 140 can be a non-flat portion, an uneven pattern portion, a microlens portion, or a light scattering pattern portion.

[0116] The plurality of recesses 140 can be formed in a concave shape inside the overcoat layer 113. For example, the plurality of recesses 140 can be formed in a concave shape from the upper surface 1131a of the first layer 1131 included in the overcoat layer 113. Therefore, the first layer 1131 can include the plurality of recesses 140. The first layer 1131 can be arranged between the substrate 110 and the light-emitting element layer (E) in the third direction (Z-axis direction). The recess 140 can include a first recess 141 arranged adjacent to the pattern portion 120 in the first direction (X-axis direction) and a second recess 142 connected to the first recess 141 and arranged further away from the pattern portion 120 than the first recess 141.

[0117] A second layer 1132 of the overcoat layer 113 may be disposed between the first layer 1131 and the light-emitting element layer (E) (or the pixel electrode 114 shown in FIG. 3). The second layer 1132 according to an example may be formed wider than the pixel electrode 114 in the first direction (X-axis direction). Thus, a part of the second layer 1132 may overlap with the light-emitting region (EA), and the remainder may contact a part of the bottom surface 120b while covering the inclined surface 120s of the pattern portion 120. That is, as shown in FIG. 3, the second layer 1132 may extend from the light-emitting region (EA) to the first region (A1) and contact a part of the bottom surface 120b of the pattern portion 120 while covering the inclined surface 120s of the pattern portion 120. Since the upper surface 1132a of the second layer 1132 is configured to be flat, the pixel electrode 114 disposed on the upper surface 1132a of the second layer 1132 may also be configured to be flat. An organic light-emitting layer 116 may be disposed on the pixel electrode 114.

[0118] On the other hand, the refractive index of the second layer 1132 may be configured to be larger than the refractive index of the first layer 1131. Thus, as shown in FIG. 3, a part of the light emitted from the organic light-emitting layer 116 toward the substrate 110 may change the optical path toward the reflection portion 130 due to the refractive index difference between the second layer 1132 forming the plurality of recesses 140 and the first layer 1131. For example, as shown in FIG. 3, a part of the light emitted from the organic light-emitting layer 116 toward the substrate 110 may be refracted by the first recess 141 disposed adjacent to the pattern portion 120 to form an optical path to the reflection portion 130 (for example, due to the difference in refractive index, the light may be aligned more linearly and may reach the user's eye better like the dotted line (L2)). Therefore, the light whose path is formed to the reflection portion 130 by the first recess 141 may be reflected by the reflection portion 130 and emitted toward the light-emitting region (EA) side of the sub-pixel (SP) that emits light. Therefore, in the display device 100 according to an embodiment of the present specification, the first recess 141 disposed at an end of the plurality of recesses 140 increases the amount of light refracted by the reflection portion 130, thereby increasing the amount of light reflected by the reflection portion 130 and emitted outside the substrate 110 and improving the viewing angle. Hereinafter, the light reflected by the reflection portion 130 and emitted toward the substrate 110 is defined as reflected light (L1).

[0119] On the other hand, in FIG. 3, only the case where the light reflected by the reflection portion 130 is emitted to the light-emitting region (EA) of the sub-pixel (SP) (or the first sub-pixel (SP)) that emits light is illustrated. However, the light reflected by the reflection portion 130 may be emitted from the non-light-emitting region (NEA) surrounding the light-emitting sub-pixel (SP) (or the first sub-pixel (SP)). Therefore, the display device 100 according to an embodiment of the present specification can extract reflected light (L1) from the non-light-emitting region (NEA) by the reflection portion 130 disposed in the non-light-emitting region (NEA), so that the light extraction efficiency can be maximized.

[0120] The display device 100 according to an embodiment of the present specification may further include light that is emitted to the substrate 110 through the plurality of recesses 140 without being reflected by the reflection portion 130. For example, as shown by the dotted line in FIG. 3, after emitting light from the organic light-emitting layer 116 and entering the plurality of recesses 140, it refracts at the outer contour of each of the plurality of recesses 140 (or the interface between the second layer 1132 and the first layer 1131) and directly goes toward the substrate 110 and may further include direct light (L2) that is emitted outside the display device. Therefore, the display device 100 according to an embodiment of the present specification can be emitted to the outside of the substrate 110 in the form of reflected light (L1) and direct light (L2) through the plurality of recesses 140 and the reflection portion 130, so that the overall light extraction efficiency can be improved.

[0121] On the other hand, in the display device 100 according to an embodiment of the present specification, since the pattern portion 120 is disposed so as to surround the light-emitting region (EA), at least a part of the reflection portion 130 on the pattern portion 120 may be disposed so as to surround the light-emitting region (EA). Therefore, the reflected light can be emitted toward the substrate 110 at a position separated from the light-emitting region (EA) while surrounding at least a part of the light-emitting region (EA). Therefore, in the display device 100 according to an embodiment of the present specification, light that disappears due to a waveguide (or optical waveguide) and / or light that disappears due to total internal reflection can be emitted from the non-light-emitting region (NEA) in the form of reflected light through the reflection portion 130 surrounding at least a part of the light-emitting region (EA), so that the light extraction efficiency is improved and the overall light emission efficiency can be improved.

[0122] Hereinafter, the structure of each of the plurality of sub-pixels (SP) will be specifically described.

[0123] Referring to FIG. 3, a display device 100 according to an embodiment of the present specification may further include a buffer layer (BL), a circuit element layer, a thin film transistor (not shown), a pixel electrode 114, a bank 115, an organic light emitting layer 116, a reflective electrode 117, a sealing layer 118, and a color filter (CF).

[0124] More specifically, each of the sub-pixels (SP) according to an embodiment is formed on the upper surface of the buffer layer (BL) and includes a circuit element layer including a gate insulating layer (not shown), an interlayer insulating layer 111, and a passivation layer 112, an overcoat layer 113 formed on the circuit element layer, a pixel electrode 114 formed on the overcoat layer 113, a bank 115 covering the ends of the pixel electrode 114, an organic light emitting layer 116 on the pixel electrode 114 and the bank 115, a reflective electrode 117 on the organic light emitting layer 116, and a sealing layer 118 on the reflective electrode 117.

[0125] A thin film transistor for driving the sub-pixel (SP) may be disposed in the circuit element layer. The circuit element layer can be represented by the term of an inorganic film layer. The pixel electrode 114, the organic light emitting layer 116, and the reflective electrode 117 may be included in the light emitting element layer (E).

[0126] The buffer layer (BL) may be formed between the substrate 110 and the gate insulating layer to protect the thin film transistor. The buffer layer (BL) may be disposed over the entire surface (or front surface) of the substrate 110. A pixel power supply line (EVDD) for pixel driving may be disposed between the buffer layer (BL) and the passivation layer 112. However, it is not limited thereto, and the pixel power supply line (EVDD) may be disposed between the substrate 110 and the buffer layer (BL). The buffer layer (BL) can also serve to block the outgassing or diffusion of substances contained in the substrate 110 into the transistor layer during the manufacturing process of the thin film transistor. Optionally, the buffer layer (BL) may be omitted in some cases.

[0127] A thin film transistor (or driving transistor) according to an example may include an active layer, a gate electrode, a source electrode, and a drain electrode. The active layer may include a channel region, a drain region, and a source region formed in a thin film transistor region of a circuit region of a sub-pixel (SP). The drain region and the source region may be spaced apart from each other in parallel with the channel region interposed therebetween.

[0128] The active layer may be composed of a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxides, and organic materials.

[0129] The gate insulating layer may be formed over the channel region of the active layer. As an example, the gate insulating layer may be formed in an island form only over the channel region of the active layer, or may be formed over the entire front surface of the substrate 110 or the buffer layer (BL) including the active layer.

[0130] The gate electrode may be formed over the gate insulating layer so as to overlap with the channel region of the active layer.

[0131] The interlayer insulating layer 111 may be formed so as to partially overlap with the gate electrode and the drain region and the source region of the active layer. The interlayer insulating layer 111 may be formed over the entire light emitting region where light is emitted in the circuit region and the sub-pixel (SP).

[0132] The source electrode may be electrically connected to the source region of the active layer through a source contact hole provided in the interlayer insulating layer overlapping with the source region of the active layer. The drain electrode may be electrically connected to the drain region of the active layer through a drain contact hole provided in the interlayer insulating layer 111 overlapping with the drain region of the active layer.

[0133] Each of the drain electrode and the source electrode may be made of the same metal material. For example, each of the drain electrode and the source electrode may be composed of the same or different single metal layer as the gate electrode, a single layer of an alloy, or a multilayer of two or more layers.

[0134] On the other hand, in the display device 100 according to an embodiment of the present specification, the substrate 110 may include a connection region (CNA) where the thin film transistor in the circuit region (CA) is connected to the pixel electrode 114. The connection region (CNA) according to an example is a region where the thin film transistor in the circuit region (CA) is connected to the pixel electrode 114. As shown in FIG. 2, the connection region (CNA) according to an example may be a region between the light emitting region (EA) and the circuit region (CA). Since the connection region (CNA) is a region where the thin film transistor is connected to the pixel electrode 114, the pattern portion 120 may not be formed in the connection region (CNA). For example, the pattern portion 120 may have a small area where the wiring connection can pass through and is disconnected. When the pattern portion 120 is formed in the connection region (CNA), the thickness of the pixel electrode 114 becomes thin due to the step of the pattern portion 120, and the pixel electrode 114 may be short-circuited. Therefore, the display device 100 according to an embodiment of the present specification can prevent the connection between the pixel electrode 114 and the thin film transistor from being weakened by configuring the pattern portion 120 not to be formed in the connection region (CNA).

[0135] Additionally, the circuit region may further include first and second switching thin film transistors arranged together with the thin film transistor, and a capacitor. Each of the first and second switching thin film transistors is provided on the circuit region of the sub-pixel (SP) so as to have the same structure as the thin film transistor, and thus the description thereof will be omitted. The capacitor can be provided in a superimposed region between the gate electrode and the source electrode of the thin film transistor that are superimposed with each other across the interlayer insulating layer 111.

[0136] Additionally, although the thin-film transistor provided in the pixel region may have a characteristic that its threshold voltage shifts due to light, in order to prevent this, the display panel or the substrate 110 may further include a light-shielding layer provided under at least one active layer among the thin-film transistor, the first switching thin-film transistor, and the second switching thin-film transistor. The light-shielding layer is provided between the substrate 110 and the active layer, and by blocking the light incident on the active layer side through the substrate 110, it is possible to minimize the change in the threshold voltage of the transistor due to external light. Also, by providing the light-shielding layer between the substrate 110 and the active layer, it is possible to prevent the thin-film transistor from being visible to the user.

[0137] The passivation layer 112 can be provided on the substrate 110 so as to cover the pixel region. The passivation layer 112 covers the drain electrode, source electrode, gate electrode of the thin-film transistor, and the buffer layer. Between the passivation layer 112 and the interlayer insulating layer 111, data lines, for example, as shown in FIG. 3, the first data line (DL1) and the second data line (DL2) can be arranged. The first data line (DL1), the second data line (DL2), and the pixel power supply line (EVDD) can be arranged in the non-emitting region (NEA) so as not to block the light-emitting region (EA). The passivation layer 112 can be formed over the entire circuit region (CA) and the light-emitting region (EA). Such a passivation layer 112 can be omitted. A color filter (CF) can be arranged on the passivation layer 112.

[0138] The overcoat layer 113 can be provided on the substrate 110 so as to cover the passivation layer 112 and the color filter (CF). When the passivation layer 112 is omitted, the overcoat layer 113 can be provided on the substrate 110 so as to cover the circuit region. The overcoat layer 113 can be formed over the entire circuit region and the light-emitting region (EA) where the thin-film transistors are disposed. Also, the overcoat layer 113 can be formed over the entire non-display region (NDA) and the display region (DA) excluding the pad portion (PA) in the non-display region (NDA). For example, the overcoat layer 113 may include an extension portion (or an extended portion) that extends or expands toward the remaining non-display region (NDA) excluding the pad portion (PA) from the display region (DA). Accordingly, the overcoat layer 113 may have a relatively larger size than the display region (DA).

[0139] The overcoat layer 113 according to an example may be formed to have a relatively thick thickness and can provide a flat surface over the display region (DA) and the non-display region (NDA). For example, the overcoat layer 113 can be made of an organic material such as photoacrylic, benzocyclobutene, polyimide, and fluororesin.

[0140] The overcoat layer 113 formed in the display region (DA) (or the light-emitting region (EA)) may include a plurality of recesses 140 (for example, the recesses 140 may have a dimple shape or a shape with an opening). Also, the recesses 140 may be alternately arranged on a plane (for example, a honeycomb arrangement). The plurality of recesses 140 are configured to enhance the light efficiency of the light-emitting region (EA) and can be formed inside the overcoat layer 113. Specifically, as shown in FIG. 3, the plurality of recesses 140 may be formed in a concave shape in the first layer 1131 of the overcoat layer 113. The plurality of recesses 140 (or the first recess 141 and the second recess 142) may be configured to be connected to each other.

[0141] On the first layer 1131, a second layer 1132 having a refractive index greater than that of the first layer 1131 can be formed (for example, refractive index of 1132 > refractive index of 1131). Due to the refractive index difference between the second layer 1132 and the first layer 1131, among the light emitted from the light-emitting element layer (E), the light traveling toward the adjacent sub-pixels (SP) can change its optical path toward the reflection portion 130. The second layer 1132 is configured to cover the plurality of recesses 140 formed in the first layer 1131, and the upper surface 1132a can be configured to be flat.

[0142] When the pixel electrode 114 is formed on the upper surface 1132a of such a second layer 1132, the pixel electrode 114 can also be configured to be flat, and the organic light-emitting layer 116 and the reflective electrode 117 formed thereon can also be configured in a flat form. Since the pixel electrode 114, the organic light-emitting layer 116, and the reflective electrode 117, that is, the light-emitting element layer (E) are configured to be flat in the light-emitting region (EA), the thicknesses of the pixel electrode 114, the organic light-emitting layer 116, and the reflective electrode 117 in the light-emitting region (EA) can be formed uniformly. Therefore, the organic light-emitting layer 116 can emit light uniformly without deviation in the light-emitting region (EA).

[0143] The plurality of recesses 140 can be formed in the first layer 1131 through a photolithography process using a mask that forms an opening after the first layer 1131 is coated to cover the passivation layer 112 and the color filter (CF), and after the photolithography process, through a patterning (or etching) or ashing process. However, it is not necessarily limited to this. The plurality of recesses 140 can be formed in a region that overlaps with the color filter (CF) and / or a region that does not overlap with the bank 115 of the non-light-emitting region (EA). However, it is not limited to this, and the first recess 141 among the plurality of recesses 140 can also be formed so as to partially overlap with the bank 115.

[0144] On the other hand, in the display device 100 according to an embodiment of the present specification, since the aspect ratio of the first recess 141 is configured to be smaller than the aspect ratio of the second recess 142, the first radius (R1) of the first recess 141 and the second radius (R2) of the second recess 142 can be configured to be different from each other. The respective radii of the first recess 141 and the second recess 142 can be formed to have different radii when the sizes of the openings of the mask are made different. Therefore, the display device 100 according to an embodiment of the present specification can form the first recess 141 and the second recess 142 having different radii (or aspect ratios) without adding a mask, so that the light extraction efficiency through the first recess 141 can be improved without increasing the manufacturing cost.

[0145] Referring to FIG. 3 again, the color filter (CF) disposed in the light emitting region (EA) can be configured between the substrate 110 and the overcoat layer 113. Therefore, the color filter (CF) can be disposed between the pixel driving wiring, for example, between the pixel power line (EVDD) and the reflection part 130, or between the pixel power line (EVDD) and the pattern part 120. The color filter (CF) may include a red color filter (or first color filter) (CF1) that converts white light emitted from the organic light emitting layer 116 into red light, a blue color filter (or second color filter) (CF2) that converts white light into blue light, and a green color filter (or third color filter) (CF3) that converts white light into green light. The fourth sub-pixel, which is a white sub-pixel, may not include a color filter because the organic light emitting layer 116 emits white light.

[0146] The display device 100 according to an embodiment of the present specification can be configured such that color filters having different colors partially overlap at the boundary portions of a plurality of sub-pixels (SP). For example, as shown in FIG. 3, the first color filter (CF1) of the first sub-pixel (SP1) can partially overlap with the third color filter (CF3') of the fourth sub-pixel (SP4') between the first sub-pixel (SP1) and the fourth sub-pixel (SP4') of another pixel adjacent to the first sub-pixel (SP1) (for example, a kind of black matrix is formed in the region between adjacent sub-pixels). Therefore, the display device 100 according to an embodiment of the present specification can prevent the light emitted from each sub-pixel (SP) from being emitted to an adjacent sub-pixel (SP) by the color filter overlapping at the boundary portion of the sub-pixel (SP), and can prevent color mixing between the sub-pixels (SP). Further, the region where the color filter (for example, the black matrix portion) overlaps can overlap with the center of the reflection portion 130 and the pattern portion 120 configuration, and can more effectively prevent color mixing between sub-pixels.

[0147] The pixel electrode 114 of the sub-pixel (SP) can be formed on the overcoat layer 113. The pixel electrode 114 can be connected to the drain electrode or the source electrode of the thin film transistor through a contact hole penetrating the overcoat layer 113 and the passivation layer 112. The end portion of the pixel electrode 114 can be covered with the bank 115.

[0148] Since the display device 100 according to an embodiment of the present specification is of a bottom emission type, the pixel electrode 114 can be formed of a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO that can transmit light, or a semi-transmissive conductive material (Semi-transmissive Conductive Material) such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag).

[0149] On the other hand, the material forming the pixel electrode 114 may include MoTi. Such a pixel electrode 114 can be represented by the term of the first electrode or the anode electrode.

[0150] Bank 115 may be configured to surround the light-emitting portions (or a plurality of recesses 140) each of the plurality of sub-pixels (SP) in a region where light does not emit. That is, Bank 115 may partition (or define) the recesses 140 each of the light-emitting portion or the sub-pixel (SP). The light-emitting portion may mean a portion where the pixel electrode 114 and the reflective electrode 117 are in contact with the upper surface and the lower surface of the organic light-emitting layer 116 with the organic light-emitting layer 116 interposed therebetween.

[0151] Bank 115 may be formed to cover each end of the pixel electrode 114 each of the sub-pixels (SP) and to expose a part of each of the pixel electrodes 114. That is, Bank 115 can partially cover the pixel electrode 114. Thereby, Bank 115 can prevent the pixel electrode 114 and the reflective electrode 117 from contacting at each end of each of the pixel electrodes 114. The exposed portion of the pixel electrode 114 not blocked by the Bank 115 may be included in the light-emitting portion (or the light-emitting region (EA)). Since such a light-emitting portion can be formed on a plurality of recesses 140 as shown in FIG. 3, the light-emitting portion (or the light-emitting region (EA)) can partially overlap with the recesses 140 in the thickness direction of the substrate 110 (or the third direction (Z-axis direction)). In addition, the configurations of Bank 115, the reflective portion 130, and the pattern portion 120 can help prevent current leakage between adjacent sub-pixels.

[0152] After Bank 115 is formed, the organic light-emitting layer 116 may be formed to cover the pixel electrode 114 and Bank 115. Therefore, Bank 115 can be configured between the pixel electrode 114 and the organic light-emitting layer 116. Such a Bank 115 can be expressed in terms of a pixel defining film. An example of Bank 115 may include an organic substance and / or an inorganic substance. As shown in FIG. 3, Bank 115 may be formed to be concave or inclined along the profile of the pattern portion 120 (or the second layer 1132).

[0153] Referring to FIG. 3 again, the organic light-emitting layer 116 can be formed on the pixel electrode 114 and the bank 115. Since the organic light-emitting layer 116 is configured between the pixel electrode 114 and the reflective electrode 117, when voltages are applied to the pixel electrode 114 and the reflective electrode 117 respectively, an electric field can be formed between the pixel electrode 114 and the reflective electrode 117 to emit light. The organic light-emitting layer 116 can be formed of a plurality of sub-pixels (SP) and a common layer configured on the bank 115.

[0154] According to an example, the organic light-emitting layer 116 can be configured to emit white light. The organic light-emitting layer 116 can include a plurality of stacks that emit light of different hues. For example, the organic light-emitting layer 116 can include a first stack, a second stack, and a charge generation layer (CGL) configured between the first stack and the second stack. By configuring the light-emitting layer to emit white light, each of the plurality of sub-pixels (SP) can include a color filter (CF) that codes for the corresponding color.

[0155] The first stack is configured on the pixel electrode 114, and a hole injecting layer (HIL), a hole transporting layer (HTL), a blue light-emitting layer (EML(B)), and an electron transporting layer (ETL) can be sequentially stacked and configured.

[0156] The charge generation layer serves to supply charges to the first stack and the second stack. The charge generation layer can include an N-type charge generation layer for supplying electrons to the first stack and a P-type charge generation layer for supplying holes to the second stack. The N-type charge generation layer can include a metal substance as a dopant.

[0157] The second stack is formed on the first stack and can have a structure in which a hole transport layer (HTL), a yellow green (YG) emitting layer (Emitting Layer; EML(YG)), an electron transport layer (ETL), and an electron injection layer (Electron Injecting Layer; EIL) are laminated in order.

[0158] In the display device 100 according to an embodiment of the present specification, since the organic light emitting layer 116 is configured as a common layer, the first stack, the charge generation layer, and the second stack can be arranged over a plurality of sub-pixels (SP). On the other hand, the organic light emitting layer 116 is not limited to a two-stack tandem structure and can be configured as a three-stack or four-stack tandem structure depending on the light emitting structure.

[0159] The reflective electrode 117 can be formed on the organic light emitting layer 116. The reflective electrode 117 can be arranged in a light emitting region (EA) and a non-light emitting region (NEA). The reflective electrode 117 according to an example can include a metal substance. The reflective electrode 117 can reflect the light emitted from the organic light emitting layer 116 in the plurality of sub-pixels (SP) toward the lower surface of the substrate 110. Therefore, the display device 100 according to an embodiment of the present specification can be configured as a bottom emission type display device.

[0160] The display device 100 according to an embodiment of the present specification is a bottom emission type, and since the light emitted by the organic light emitting layer 116 must be reflected toward the substrate 110, the reflective electrode 117 can be made of a metal substance with a high reflectivity. The reflective electrode 117 according to an example can be formed of a metal substance with a high reflectivity such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, and a laminated structure of an Ag alloy and ITO (ITO / Ag alloy / ITO). The Ag alloy can be an alloy of silver (Ag), palladium (Pd), copper (Cu), etc. Such a reflective electrode 117 can be represented by terms such as a second electrode, a cathode electrode, and a counter electrode.

[0161] On the one hand, in the display device 100 according to an embodiment of the present specification, the reflection part 130 may be a part of the reflection electrode 117. However, the embodiment is not limited thereto. For example, according to another embodiment, the reflection part 130 may be a separate layer separated from the reflection electrode 117. Therefore, the reflection part 130 can reflect light toward the light emitting region (EA) of the sub-pixel (SP) that emits light to the adjacent sub-pixel (SP). Since the reflection part 130 is a part of the reflection electrode 117, it can also be denoted by the drawing reference numeral 117a as shown in FIG. 3. In the present specification, the reflection part 130 may mean the reflection electrode 117 that overlaps the pattern part 120. In particular, the reflection part 130 may mean the reflection electrode 117 that is inclined while overlapping the pattern part 120. Thereby, as shown in FIG. 3, the reflection part 130 can reflect light toward the light emitting region (EA) of the sub-pixel (SP) that emits light and / or light that disappears through total reflection between interfaces, or the non-light emitting region (NEA).

[0162] A sealing layer 118 is formed on the reflection electrode 117. The sealing layer 118 serves to prevent oxygen and moisture from penetrating into the organic light emitting layer 116 and the reflection electrode 117. For this purpose, the sealing layer 118 may include at least one inorganic film and at least one organic film. The sealing layer 118 can be disposed not only in the light emitting region (EA) but also in the non-light emitting region (NEA). The sealing layer 118 can be disposed between the reflection electrode 117 and the counter substrate 200.

[0163] Referring to FIG. 3, the pattern part 120 can be formed in a concave shape (for example, a recess or a trench) in the first layer 1131 of the overcoat layer 113. Such a pattern part 120 can be disposed in the non-light emitting region (NEA) as shown in FIG. 3. That is, the pattern part 120 can be disposed so as to surround the light emitting region (EA) adjacent to the plurality of recesses 140. When a plurality of recesses 140 are formed in the light emitting region (EA), the pattern part 120 can be formed together in the non-light emitting region (NEA) (for example, the same etching process or the same mask process, etc.). The pattern part 120 may include a bottom surface 120b and an inclined surface 120s.

[0164] In one example, the bottom surface 120b of the pattern portion 120 is the surface formed closest to the substrate 110 in the pattern portion 120, and can be disposed closer to the substrate 110 (or the upper surface 110a of the substrate) than the pixel electrode 114 (or the lower surface of the pixel electrode 114) in the light emitting region (EA). For example, the lowermost portion of the pattern portion 120 can be positioned closer to the substrate than the lowermost portion of the pixel electrode 114. Accordingly, the bottom surface 120b of the pattern portion 120 can be configured with the same or a similar depth as the respective depths of the plurality of recesses 140. However, if the depth of the pattern portion 120 is lower than the depth of the recess 140, the area of the reflective portion 130 becomes small, which may reduce the light extraction efficiency. Accordingly, the display device 100 according to an embodiment of the present specification can be configured such that the depth of the pattern portion 120 is the same as or deeper than the depth of the recess 140 (for example, the pattern portion 120 can be formed deeper or closer to the substrate than the recess 140).

[0165] The inclined surface 120s of the pattern portion 120 can be disposed between the bottom surface 120b and the plurality of recesses 140. Accordingly, the inclined surface 120s of the pattern portion 120 can be configured to surround the light emitting region (EA) or the plurality of recesses 140. As shown in FIG. 3, the inclined surface 120s can be connected to the bottom surface 120b. The inclined surface 120s can form a predetermined angle with the bottom surface 120b. For example, the angle formed by the inclined surface 120s and the bottom surface 120b can be an obtuse angle. Accordingly, the width of the pattern portion 120 can be configured to gradually decrease in the direction from the counter substrate 200 (or the reflective portion 130) toward the substrate 110 (or the third direction (Z-axis direction)). By the inclined surface 120s and the bottom surface 120b forming an obtuse angle, the second layer 1132, the bank 115, the organic light emitting layer 116, and the reflective portion 130 formed in subsequent processes can be formed in a concave shape along the profile of the pattern portion 120.

[0166] As shown in FIG. 3, the pattern portion 120 may be configured to surround the light-emitting region (EA). By configuring the pattern portion 120 to surround the light-emitting region (EA), at least a part of the reflecting portion 130 disposed obliquely on the pattern portion 120 may be configured to surround the light-emitting region (EA). Thereby, the display device 100 according to an embodiment of the present specification can perform light extraction even in the non-light-emitting region (NEA) around the edge of the light-emitting region (EA), so that the overall light efficiency can be improved. Therefore, the display device 100 according to an embodiment of the present specification can have the same light-emitting efficiency with lower power or improve the light-emitting efficiency more than that of a general display device without the pattern portion 120 and the reflecting portion 130 on the pattern portion 120, so that the overall power consumption can be reduced.

[0167] In addition, since the display device 100 according to an embodiment of the present specification can emit light from the light-emitting element layer (E) even with low power, the lifespan of the light-emitting element layer (E) (or the organic light-emitting layer 116) can be improved.

[0168] Since the pattern portion 120 is arranged to surround the light-emitting region (EA), it can be arranged between sub-pixels (SP) that emit different colors from each other. Therefore, the reflecting portion 130 arranged obliquely on the pattern portion 120 can also be arranged between sub-pixels (SP) that emit different colors from each other, whereby the reflecting portion 130 can prevent light of different colors from being emitted to other adjacent sub-pixels (SP). Therefore, the display device 100 according to the present specification can prevent color mixing (or color shift) between sub-pixels (SP) that emit different colors from each other, improve color purity, and improve the quality of the image.

[0169] Referring to FIG. 2, the pattern portion 120 may include a first pattern line 121 that is long in the first direction (X-axis direction) between the circuit region (CA) and the light-emitting region (EA), and a second pattern line 122 that is long in the second direction (Y-axis direction) intersecting the first direction (X-axis direction). Based on FIG. 2, the first pattern line 121 can mean the pattern portion 120 arranged long in the horizontal direction, and the second pattern line 122 can mean the pattern portion 120 arranged long in the vertical direction.

[0170] The first pattern line 121 may include a bottom surface and an inclined surface. The second pattern line 122 may include a bottom surface 122b and an inclined surface 122s. Since the bottom surface and the inclined surface of the first pattern line 121 and the bottom surface 122b and the inclined surface 122s of the second pattern line 122 are the same as those of the bottom surface 120b and the inclined surface 120s of the pattern portion 120, the description thereof will be omitted. The first pattern line 121 and the second pattern line 122 may be connected together in the non-light-emitting region (NEA) (or peripheral region) so as to surround the light-emitting region (EA). The first pattern line 121 may be arranged between sub-pixels (SP) that emit the same color light. The second pattern line 122 may be arranged between sub-pixels (SP) that emit different colors of light.

[0171] Since the second pattern line 122 is arranged between sub-pixels (SP) that emit different colors of light, the reflection portion 130 on the second pattern line 122 can prevent light of different colors from being emitted to other adjacent sub-pixels (SP). Therefore, the display device 100 according to the present specification can prevent color mixing (or color shift) between sub-pixels (SP) that emit different colors of light, and can improve color purity.

[0172] In addition, since the second pattern line 122 is arranged to be long in the second direction (Y-axis direction) among sub-pixels (SPs) that emit light of different colors from each other, the second pattern line 122 may not overlap with the data line (for example, the first data line (DL1)) in the second direction (Y-axis direction). On the contrary, since the first pattern line 121 is arranged to be long in the first direction (X-axis direction), it may partially overlap with the data line (for example, the first data line (DL1)) in the second direction (Y-axis direction).

[0173] On the other hand, the second layer 1132 of the overcoat layer 113 can further extend from the light-emitting region (EA) to the non-light-emitting region (NEA) and partially cover the inclined surface 120s of the pattern portion 120. Therefore, as shown in FIG. 3, the end 1132c of the second layer 1132 can contact the bottom surface 120b of the pattern portion 120. However, in this case, the end 1132c of the second layer 1132 can only contact a part of the bottom surface 120b. This is because if the second layer 1132 covers the entire bottom surface 120b, the depth of the reflection portion 130 formed relatively on the pattern portion 120 becomes shallow, and the reflection efficiency may decrease. Therefore, the display device 100 according to an embodiment of the present specification is configured such that the second layer 1132 does not cover the entire bottom surface 120b of the pattern portion 120 but only contacts a part of the bottom surface 120b, so that the reflection portion 130 formed in a subsequent process can be formed to be located near the bottom surface 120b, and the reflection efficiency can be improved.

[0174] The bank 115 may extend to cover the inclined surface 1132b of the second layer 1132 while covering the inclined surface 120s of the pattern portion 120 while covering the end of the pixel electrode 114. Accordingly, the bank 115 may contact a part of the bottom surface 120b of the pattern portion 120 that is not covered by the second layer 1132. This is because if the bank 115 covers the entire bottom surface 120b, the depth of the reflection portion 130 formed relatively on the pattern portion 120 becomes shallow, which may reduce the reflection efficiency. Thus, as shown in FIG. 3, the second layer 1132 and the bank 115 on the bottom surface 120b of the pattern portion 120 may be configured discontinuously. That is, on the bottom surface 120b of the pattern portion 120, the second layer 1132 and the bank 115 may be cut off from each other. As a result, the display device 100 according to an embodiment of the present specification is configured such that the bank 115 contacts only a part of the bottom surface 120b without covering the entire bottom surface 120b, and is formed in a subsequent process. The reflection portion 130 can be formed so as to be close to the bottom surface 120b, and the reflection efficiency can be improved.

[0175] On the other hand, since the bank 115 is configured to contact only a part of the bottom surface 120b of the pattern portion 120, the bank 115 can be disconnected by the pattern portion 120 as shown in FIG. 3. When the bank 115 is disconnected by the pattern portion 120, the reflection portion 130 disposed on the pattern portion 120 can be disposed close to the bottom surface 120b of the pattern portion 120. Therefore, compared with the case where the bank is not disconnected by the pattern portion, the reflection portion 130 can be formed as deeply as possible in the pattern portion 120, and the reflection efficiency can be improved. As shown in FIG. 3, since the pattern portion 120 is disposed between sub-pixels (SP), the second layer 1132, the bank 115, the organic light-emitting layer 116, and the reflection portion 130 can be configured in a symmetric form with respect to the center of the pattern portion 120 (or the center of the second region (A2)).

[0176] In the display device 100 according to an embodiment of the present specification, a plurality of wirings, for example, a pixel power line (EVDD), a data line, and a reference line (RL) can be arranged so as not to block the light emitting region (EA) (or not to overlap the light emitting region (EA)). This is because if the plurality of wirings overlap or block the light emitting region (EA), the light reflected by the reflection unit 130 is blocked by the plurality of wirings and cannot be emitted toward the substrate 110. Therefore, the display device 100 according to an embodiment of the present specification can maximize the light extraction efficiency by arranging the plurality of wirings in the non-light emitting region (NEA) so as not to overlap the light emitting region (EA). Further, since the display device 100 according to an embodiment of the present specification is configured such that the plurality of wirings do not overlap the light emitting region (EA), the aperture ratio can be increased and the luminance can be improved as compared with the case where the plurality of wirings overlap the light emitting region. In FIG. 3, the arrangement structure of the first data line (DL1) and the second data line (DL2) in the first sub-pixel (SP1) and the second sub-pixel (SP2) is described as an example, but such a structure can be similarly applied to the third sub-pixel (SP3) and the fourth sub-pixel (SP4).

[0177] On the other hand, when the bank 115 is cut off by the pattern portion 120, the organic light emitting layer 116 and the reflection portion 130 (or the reflection electrode 117) formed in a subsequent process can be formed along the profiles of the bank 115 and the bottom surface 120b of the pattern portion 120.

[0178] According to one example, the reflective portion 130 is formed in a concave shape on the pattern portion 120 along the profile of the pattern portion 120 formed in a concave shape around the non-emitting area (NEA), so that it can be formed to incline around the non-emitting area (NEA). According to one example, the reflective portion 130 may include a flat surface 131 disposed at the central portion of the second region (A2) and an inclined surface 132 connected to the flat surface 131, as shown in FIG. 3. The inclined surface 132 may include a lower surface 1321 (or a side surface 1321) where light refracted by the recess 140 and incident thereon is reflected. The flat surface 131 may be disposed parallel to the bottom surface 120b of the pattern portion 120. The inclined surface 132 may be formed to incline along the profile of the inclined surface 120s of the pattern portion 120. Among the light emitted from the light-emitting sub-pixels (SP), most of the light traveling toward the adjacent sub-pixels (SP) can be reflected by the inclined surface 132 (or the lower surface 1321) of the reflective portion 130 and then emitted to the light-emitting area (EA) of the light-emitting sub-pixels (SP) or the non-emitting area (NEA) of the light-emitting sub-pixels (SP).

[0179] The display device 100 according to an embodiment of the present specification may determine the width (W) of the edge region (EDA) where at least a part of the first recess 141 is superimposed by a formula. For example, the width (W) of the edge region (EDA) can be derived by a formula related to the vertical distance from the organic light-emitting layer 116 to the substrate 110 and the largest angle at which the light emitted from the organic light-emitting layer 116 is emitted outside the substrate 110 without total reflection on the upper surface 110a of the substrate 110. This will be described with reference to FIG. 4.

[0180] FIG. 4 is an enlarged view of the A portion of FIG. 3.

[0181] Referring to FIG. 4, the width (W) of the edge region (EDA) is the following formula (or Formula 1),

Equation

[0182] The foregoing T may be the vertical distance from the lower surface 1161 of the organic light-emitting layer 116 to the upper surface 110a of the substrate 110. As shown in FIG. 4, the vertical distance may be in a direction parallel to the third direction (Z-axis direction). The foregoing θ final may be the largest angle at which the light emitted from the organic light-emitting layer 116 is emitted to the outside of the substrate 110 without total reflection on the upper surface 110a of the substrate 110. That is, θ final may be the largest angle at which the light is emitted to the outside without being confined in the substrate 110.

[0183] As shown in FIG. 4, since the first radius (R1) of the first recess 141 is larger than the second radius (R2) of the second recess 142, the first recess 141 may partially overlap with the edge region (EDA). For example, as shown in FIG. 4, a part of the left side of the first recess 141 can overlap with the first region (A1), and the remainder excluding a part of the left side of the first recess 141 can overlap with the edge region (EDA). In FIG. 4, although it is shown in the figure that the first recess 141 partially overlaps with the edge region (EDA), the present invention is not limited thereto, and the entire first recess 141 can also overlap with the edge region (EDA). In the display device 100 according to an embodiment of the present specification, the first recess 141 having an aspect ratio smaller than that of the second recess 142 is arranged to overlap with the edge region (EDA), so that the light emitted from the organic light-emitting layer 116 and incident on the first recess 141 can reach the reflection part 130 through the outer contour on the left side of the first recess 141 more, whereby the light extraction efficiency and / or the viewing angle can be improved.

[0184] In the case of a general display device in which all of the plurality of recesses are formed in the same form, the cavity condition becomes weaker at the end portion (or edge portion) than at the center portion of the light-emitting region, and the light efficiency decreases. This is because the recess at the end portion is configured in the same form as the recess at the center portion, so that the amount of light refracted toward the reflection part is small.

[0185] On the other hand, according to the foregoing Equation 1, when the first recess 141 overlaps with the center region (ECA), the light emitted from the organic light-emitting layer 116 is θ finalSince it enters the first concave portion 141 at a larger angle, it is totally reflected by the substrate 110 and cannot be emitted outside the substrate 110.

[0186] Therefore, the display device 100 according to an embodiment of the present specification arranges the first concave portion 141 having an aspect ratio smaller than that of the second concave portion 142 to overlap with the edge region (EDA) satisfying the above Equation 1, so that the amount of light refracted by the reflecting portion 130 for the light incident on the first concave portion 141 can be increased. Thus, a decrease in light efficiency can be prevented at the end portion of the light emitting region (EA), or rather, the light efficiency can be improved, the display device can be made brighter, and an improved image quality can be provided.

[0187] In the display device 100 according to an embodiment of the present specification, the largest angle (θ final )(or the emission angle (θ final )) at which the light emitted from the organic light emitting layer 116 is emitted outside the substrate 110 without being totally reflected by the upper surface 110a of the substrate 110 can be configured to be smaller than the angle (θ substrate )(or the extinction angle (θ substrate )) at which the light emitted from the organic light emitting layer 116 is totally reflected by the upper surface 110a of the substrate 110 and cannot be emitted outside the substrate 110. As described above, when the emission angle (θ final ) is equal to or larger than the extinction angle (θ substrate ), the light emitted from the organic light emitting layer 116 is totally reflected by the substrate 110 and cannot be emitted outside. Therefore, the display device 100 according to an embodiment of the present specification is configured such that the emission angle (θ final ) is smaller than the extinction angle (θ substrate ), so that there is no or the light totally reflected by the substrate 110 (or the upper surface 110a of the substrate 110) can be reduced, and thus the light extraction efficiency can be improved.

[0188] On the other hand, the angle (θ substrate )(or the extinction angle (θ substrate )) at which the light emitted from the organic light emitting layer 116 is totally reflected by the upper surface 110a of the substrate 110 and cannot be emitted outside the substrate 110 is the following equation (or Equation 2),

Number

[0189] Said n Anode is the refractive index of the pixel electrode 114, and said n OC1 is the refractive index of the first layer 1131, and n OC2 can be the refractive index of said second layer 1132.

[0190] The display device 100 according to an embodiment of the present specification has an emission angle (θ final ) smaller than the extinction angle (θ substrate ) that satisfies the above formula (2), so that the light totally reflected by the substrate 110 (or the upper surface 110a of the substrate 110) can be absent or reduced, and the light extraction efficiency can be improved.

[0191] FIG. 5 is a schematic cross-sectional view showing a modified example of the display device according to an embodiment of the present specification. For example, the configuration of FIG. 5 is similar to the configuration of FIG. 3, but the bank 115 is omitted.

[0192] Referring to FIG. 5, the modified example of the display device 100 according to an embodiment of the present specification is the same as the display device according to FIG. 3 described above, except that it has a bankless structure without a bank 115. Therefore, the same reference numerals are assigned to the same configurations, and only the different configurations will be described below.

[0193] In the case of the display device according to FIG. 3 described above, the bank 115 is configured to cover the ends of the pixel electrode 114 while surrounding the entire light-emitting region (EA). Therefore, in the case of the display device according to FIG. 3, the light-emitting region (EA) and the reflecting portion 130 are separated by a first distance (D1, shown in FIG. 4), so that part of the light emitted in the light-emitting region (EA) is reflected by the reflecting portion 130, or part of the light emitted in the light-emitting region (EA) is refracted by a plurality of recesses 140 (or the first recess 141) and then reflected by the reflecting portion 130 and can be emitted to the non-light-emitting region (NEA) and / or the light-emitting region (EA).

[0194] On the contrary, in the case of the display device according to FIG. 5, it may not have the bank 115 that covers the ends of the pixel electrode 114 (for example, the bank 1115 can be omitted). Therefore, as shown in FIG. 5, the reflecting portion 130 can be disposed at a second distance (D2) shorter than the first distance (D1) from the light-emitting region (EA). Since the display device according to FIG. 5 is configured with a bankless structure, the reflecting portion 130 can be positioned closer to the light-emitting region (EA) by the thickness of the bank (for example, the reflecting portion 130 can be configured closer to the end of the light-emitting region (EA)). When the distance between the reflecting portion 130 and the light-emitting region (EA) is shortened, the light that is extinguished or damaged by the layer formed between the reflecting portion 130 and the light-emitting region (EA) (for example, the second layer 1132 or the organic light-emitting layer 116 in the non-light-emitting region (NEA)) is reduced, so that the light efficiency can be further improved. Therefore, the display device according to FIG. 5 can further improve the efficiency of the light reflected by the reflecting portion 130 among the light emitted by the organic light-emitting layer 116 by disposing the reflecting portion 130 at a second distance (D2) shorter than the first distance (D1) from the light-emitting region (EA).

[0195] On the other hand, since the display device 100 according to FIG. 5 is configured with a bankless structure, as shown in FIG. 5, the organic light-emitting layer 116 may have a structural feature of contacting the second layer 1132 (or the inclined surface 1132b of the second layer 1132) in the first region (A1) and contacting the first layer 1131 (or the bottom surface 120b of the pattern portion 120) in the second region (A2).

[0196] FIG. 6A is a schematic cross-sectional view of a display device according to a second embodiment of the present specification, and FIG. 6B is an enlarged view of a portion B of FIG. 6A.

[0197] Referring to FIGS. 6A and 6B, the display device 100 according to the second embodiment of the present specification is the same as the display device according to FIG. 3 described above, except that the structure of the first recess 141 disposed in the edge region (EDA) is changed (for example, while the larger second recess 142 is located at the center of the sub-pixel, the smaller first recess 141 is located around the edge of the sub-pixel). Therefore, the same reference numerals are assigned to the same configurations, and only the different configurations will be described below.

[0198] In the case of the display device according to FIG. 3 described above, the first radius (R1) of the first recess 141 is larger than the second radius (R2) of the second recess 142, and the first vertical length (H1) of the first recess 141 is configured to be the same as the second vertical length (H2) of the second recess 142. Therefore, in the case of the display device according to FIG. 3, one first recess 141 (or a part of the first recess 141) can be disposed in the edge region (EDA). Thereby, the display device according to FIG. 3 is configured such that the length of the left outer contour (CL1) of the first recess 141 is longer than the length of the left outer contour (CL2) of the second recess 142, so that the amount of light refracted to the reflecting portion 130 can be increased, and thus the light extraction efficiency can be improved.

[0199] On the contrary, in the case of the display device according to FIG. 6A, the first radius (R1) of the first recess 141 is smaller than the second radius (R2) of the second recess 142, and the first vertical length (H1) of the first recess 141 is configured to be shorter than the second vertical length (H2) of the second recess 142. Therefore, in the case of the display device according to FIG. 6A, at least one or more (or a plurality of) first recesses 141 can be arranged in the edge region (EDA). For example, as shown in FIG. 6A, one first recess 141 can be completely superimposed on the edge region (EDA), and the other first recess 141 can be partially superimposed. Thereby, in the case of the display device according to FIG. 6A, the amount of light refracted to the reflecting portion 130 can be increased by the plurality of first recesses 141 superimposed in the edge region (EDA), so that the light extraction efficiency can be improved (for example, a larger number of recesses can be densely filled in the edge region (EDA)).

[0200] As a result, as shown in FIG. 6A, in the display device 100 according to the second embodiment of the present specification, at least one or more first recesses 141 are superimposed and arranged in the edge region (EDA), and at least one or more second recesses 142 are superimposed and arranged in the center region (ECA). Thus, the amount of light refracted to the reflecting portion 130 through the plurality of first recesses 141 is increased (for example, because the number of recesses in the edge region (EDA) is large), the light extraction efficiency of the reflected light can be improved, and the light extraction efficiency of the direct light can be improved through the second recess 142. Since the reflected light is the light reflected by the reflecting portion 130 and emitted outside the substrate 110, the improvement of the light extraction efficiency of the reflected light may mean an improvement in the viewing angle. And the improvement of the light extraction efficiency of the direct light may mean an improvement in the light extraction efficiency of the front surface by increasing the amount of light emitted to the front surface side rather than the side surface. Also, the depth of the first recess 141 may be shallower than the depth of the second recess 142.

[0201] On the other hand, in the case of the display device according to FIG. 3, since only the radii of the first recess 141 and the second recess 142 are different from each other and the vertical lengths are the same as each other, if only the sizes of the openings of one mask are different from each other, the first recess 141 and the second recess 142 can be easily formed without an additional mask.

[0202] In contrast, in the case of the display device according to FIG. 6A, since the first vertical length (H1) of the first recess 141 is configured to be shorter than the second vertical length (H2) of the second recess 142, the second recess 142 and the first recess 141 can be formed by different etching processes (or ashing processes). However, in the case of the display device according to FIG. 6A, since the first vertical length (H1) of the first recess 141 is configured to be shorter than the second vertical length (H2) of the second recess 142, the refraction area of the light refracted by the first recess 141 and reaching the reflection part 130 may be larger than the refraction area of the light refracted by the second recess 142 and reaching the reflection part 130. That is, the second recess 142 may be formed wider and deeper than the first recess 141. Therefore, in the case of the display device according to FIG. 6A, the path of the light reaching the reflection part 130 can be optimized by the plurality of first recesses 141 arranged in the edge region (EDA), the amount of light reaching the reflection part 130 can be increased, and thereby the light extraction efficiency can be improved.

[0203] On the other hand, in the display device 100 according to FIG. 6A, since the bank 115 covers the end of the pixel electrode 114, the reflection part 130 can be arranged at a first distance (D1') from the light emitting region (EA).

[0204] FIG. 7A is a schematic cross-sectional view showing a modified example of the display device according to the second embodiment of the present specification, and FIG. 7B is an enlarged view of a C portion of FIG. 7A.

[0205] Referring to FIGS. 7A and 7B, a modified example of the display device 100 according to the second embodiment of the present specification is the same as the display device according to FIG. 6A described above, except that it has a bankless structure without a bank 115. Therefore, the same reference numerals are assigned to the same configurations, and only the different configurations will be described below.

[0206] In the case of the display device according to FIG. 6A described above, the bank 115 is configured to cover the ends of the pixel electrodes 114 while surrounding the entire light-emitting region (EA). Therefore, in the case of the display device according to FIG. 6A, by separating the light-emitting region (EA) and the reflection portion 130 by a first distance (D1', shown in FIG. 6A), a part of the light emitted in the light-emitting region (EA) is reflected by the reflection portion 130, or a part of the light emitted in the light-emitting region (EA) is refracted by the plurality of recesses 140 (or the first recess 141) and then reflected by the reflection portion 130 and emitted to the non-light-emitting region (NEA) and / or the light-emitting region (EA).

[0207] On the contrary, in the case of the display device according to FIG. 7A, the bank 115 covering the ends of the pixel electrodes 114 may not be configured. Therefore, as shown in FIG. 7A, the reflection portion 130 may be disposed at a second distance (D2') shorter than the first distance (D1') from the light-emitting region (EA). Since the display device according to FIG. 7A is configured with a bankless structure without a bank, the reflection portion 130 can be positioned closer to the light-emitting region (EA) by the thickness of the bank. When the distance between the reflection portion 130 and the light-emitting region (EA) is shortened, the light that is extinguished by the layer (for example, the second layer 1132 or the organic light-emitting layer 116 in the non-light-emitting region (NEA)) formed between the reflection portion 130 and the light-emitting region (EA) is reduced, so that the light efficiency can be further improved. Therefore, in the display device according to FIG. 7A, by disposing the reflection portion 130 at a second distance (D2') shorter than the first distance (D1') from the light-emitting region (EA), the light efficiency of the light reflected by the reflection portion 130 among the light emitted from the organic light-emitting layer 116 can be further improved.

[0208] On the one hand, since the display device 100 according to FIG. 7A is configured with a bankless structure, as shown in FIG. 7A, the organic light-emitting layer 116 may have a structural feature of contacting the second layer 1132 (or the inclined surface 1132b of the second layer 1132) in the first region (A1) and contacting the first layer 1131 (or the bottom surface 120b of the pattern portion 120) in the second region (A2).

[0209] FIG. 8A is a schematic cross-sectional view of a display device according to the third embodiment of the present specification, and FIG. 8B is an enlarged view of a D portion of FIG. 8A. Here, the first recess 141 and the second recess 142 may have the same width and different depths.

[0210] Referring to FIGS. 8A and 8B, the display device 100 according to the third embodiment of the present specification is the same as the display device according to FIG. 3 described above, except that the structure of the first recess 141 disposed in the edge region (EDA) is changed. Therefore, the same reference numerals are given to the same configurations, and only the different configurations will be described below.

[0211] In the case of the display device according to FIG. 3 described above, the first radius (R1) of the first recess 141 is larger than the second radius (R2) of the second recess 142, and the first vertical length (H1) of the first recess 141 is configured to be the same as the second vertical length (H2) of the second recess 142. Therefore, in the case of the display device according to FIG. 3, one first recess 141 (or a part of the first recess 141) can be disposed in the edge region (EDA). Thereby, the display device according to FIG. 3 is configured such that the length of the left outer contour (CL1) of the first recess 141 is longer than the length of the left outer contour (CL2) of the second recess 142, so that the amount of light refracted by the reflecting portion 130 can be increased, and thus the light extraction efficiency can be improved.

[0212] On the contrary, in the case of the display device according to FIG. 8A, the first radius (R1) of the first recess 141 is the same as or substantially the same as the second radius (R2) of the second recess 142, and the first vertical length (H1) of the first recess 141 is configured to be shorter than the second vertical length (H2) of the second recess 142. Therefore, in the case of the display device according to FIG. 8A, one first recess 141 shallower than the second recess 142 can be disposed in the edge region (EDA). For example, as shown in FIG. 8A, in the edge region (EDA), one first recess 141 shallower than the second recess 142 may partially overlap. However, it is not limited thereto, and the entire first recess 141 shallower than the second recess 142 can be disposed to overlap in the edge region (EDA). Thereby, in the case of the display device according to FIG. 8A, the amount of light refracted by the first recess 141 overlapping in the edge region (EDA) to the reflecting part 130 can be increased, so that the light extraction efficiency can be improved.

[0213] As a result, as shown in FIG. 8A, the display device 100 according to the third embodiment of the present specification partially overlaps and disposes the first recess 141 shallower than the second recess 142 in the edge region (EDA), so that the refraction area refracted by the first recess 141 and reaching the reflecting part 130 can be increased, and the amount of light refracted by the reflecting part 130 can be increased, thereby improving the light extraction efficiency (and / or viewing angle) of the reflected light. In the center region (ECA), a plurality of second recesses 142 having the same radius as the first recess 141 are disposed, so that the light extraction efficiency of direct light (and / or front light extraction efficiency) can be maximized.

[0214] On the other hand, in the case of the display device according to FIG. 8A, since the first vertical length (H1) of the first recess 141 is configured to be shorter than the second vertical length (H2) of the second recess 142, the second recess 142 and the first recess 141 can be formed by different etching processes (or ashing processes). Further, in the display device 100 according to FIG. 8A, since the bank 115 covers the end of the pixel electrode 114, the reflecting part 130 can be disposed at a first distance (D1'') from the light emitting region (EA).

[0215] FIG. 9A is a schematic cross-sectional view showing a modified example of the display device according to the third embodiment of the present specification, and FIG. 9B is an enlarged view of the F portion of FIG. 9A. Here, the configuration of FIG. 9A is similar to the configuration of FIG. 8A, but the bank is removed to provide a bankless configuration.

[0216] Referring to FIGS. 9A and 9B, the modified example of the display device 100 according to the third embodiment of the present specification is the same as the display device according to FIG. 8A described above, except that it has a bankless structure without the bank 115. Therefore, the same reference numerals are assigned to the same configurations, and only the different configurations will be described below.

[0217] In the case of the display device according to FIG. 8A described above, the bank 115 is configured to surround the entire light-emitting region (EA) and cover the end of the pixel electrode 114. Therefore, in the case of the display device according to FIG. 8A, the light-emitting region (EA) and the reflecting portion 130 are separated by a first distance (D1'', shown in FIG. 8A), so that a part of the light emitted from the light-emitting region (EA) is reflected by the reflecting portion 130, or a part of the light emitted from the light-emitting region (EA) is refracted by the plurality of recesses 140 (or the first recess 141) and then reflected by the reflecting portion 130 and emitted to the non-light-emitting region (NEA) and / or the light-emitting region (EA).

[0218] On the contrary, in the case of the display device according to FIG. 9A, the bank 115 covering the ends of the pixel electrodes 114 may not be configured. Therefore, as shown in FIG. 9A, the reflective portion 130 can be disposed at a second distance (D2'') shorter than the first distance (D1'') from the light-emitting region (EA). Since the display device according to FIG. 9A is configured with a bankless structure, the reflective portion 130 can be positioned closer to the light-emitting region (EA) by the thickness of the bank. When the distance between the reflective portion 130 and the light-emitting region (EA) is shortened, the light that is extinguished by the layer formed between the reflective portion 130 and the light-emitting region (EA) (for example, the second layer 1132 or the organic light-emitting layer 116 in the non-light-emitting region NEA) is reduced, so the light efficiency can be further improved. Therefore, the display device according to FIG. 9A can further improve the light efficiency of the light reflected by the reflective portion 130 among the light emitted from the organic light-emitting layer 116 by disposing the reflective portion 130 at a second distance (D2'') shorter than the first distance (D1'') from the light-emitting region (EA).

[0219] On the other hand, since the display device 100 according to FIG. 9A is configured with a bankless structure, as shown in FIG. 9A, the organic light-emitting layer 116 may have a structural feature of contacting the second layer 1132 (or the inclined surface 1132b of the second layer 1132) in the first region (A1) and contacting the first layer 1131 (or the bottom surface 120b of the pattern portion 120) in the second region (A2).

[0220] As described above, the embodiments of the present specification have been described in more detail with reference to the accompanying drawings. However, the present specification is not necessarily limited to such embodiments, and various modifications can be made without departing from the technical idea of the present specification. Therefore, the embodiments disclosed in the present specification are for explaining rather than limiting the technical idea of the present specification, and do not limit the scope of the technical idea of the present specification. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. All technical ideas within the protection scope of the present specification should be construed as being included in the scope of rights of the present specification.

Description of Reference Numerals

[0221] 100: Display device 110: Substrate P: Pixel 111: Interlayer insulating layer 112: Passivation layer 113: Overcoat layer 114: Pixel electrode 115: Bank 116: Light-emitting layer 117: Reflective electrode 118: Encapsulation layer 120: Pattern portion 130: Reflective portion 131: Flat surface 132: Inclined surface 140: Plurality of recesses 141: First recess 142: Second recess 1131: First layer 1132: Second layer EDA: Edge area ECA: Center area

Claims

1. A first sub-pixel disposed on a substrate and having a first light-emitting region, a second sub-pixel adjacent to the first sub-pixel, disposed on the substrate, and having a second light-emitting region, a pixel electrode disposed in the first sub-pixel, an insulating layer disposed between the pixel electrode and the substrate, the insulating layer including a plurality of recesses including a first recess and a second recess having a shape different from that of the first recess, a pattern portion disposed between the first sub-pixel and the second sub-pixel, a display panel including a reflective portion that overlaps the pattern portion.

2. The display panel according to claim 1, wherein the reflective portion is configured to redirect light emitted from the first sub-pixel and passing through one of the plurality of recesses in a direction toward the substrate.

3. The pattern portion is a trench formed in the insulating layer, the display panel according to claim 1, wherein a bottom surface of the trench is lower than the pixel electrode.

4. The trench surrounds at least most of an outline of the pixel electrode in the first sub-pixel on a plane, the display panel according to claim 3, wherein the trench is spaced apart from the pixel electrode.

5. The display panel according to claim 3, wherein a cross-section of the trench has a "V" shape or a "U" shape in a non-light-emitting region between the first sub-pixel and the second sub-pixel.

6. The display panel according to claim 1, wherein the reflective portion is a part of a reflective electrode of the first sub-pixel that continuously extends across the pattern portion.

7. The first recess overlaps an edge region of the pixel electrode, the display panel according to claim 1, wherein the second recess overlaps a central region of the pixel electrode.

8. The display panel according to claim 7, wherein the first recess in the edge region is wider than the second recess.

9. The display panel according to claim 7, wherein the second recess is wider than the first recess in the edge region.

10. The display panel according to claim 7, wherein a first depth of the first recess is different from a second depth of the second recess.

11. The display panel according to claim 1, further including a bank located at an end of the pixel electrode and overlapping an inclined surface of the pattern portion.

12. The display panel according to claim 1, further including a light-emitting layer disposed in the first sub-pixel and directly contacting the inclined surface of the pattern portion.

13. The insulating layer includes a first layer having a first refractive index and a second layer having a second refractive index greater than the first refractive index. The display panel according to claim 1, wherein the second layer is disposed between the pixel electrode and the first layer.

14. The first recess is one of a plurality of first recesses of the first sub-pixel. The second recess is one of a plurality of second recesses of the first sub-pixel. The display panel according to claim 1, wherein a first aspect ratio of the plurality of first recesses is different from a second aspect ratio of the plurality of second recesses.

15. A display panel including a plurality of sub-pixels, a gate driver that supplies a gate signal to a gate line connected to the plurality of sub-pixels, and a data driver that supplies a data signal to a data line connected to the plurality of sub-pixels, wherein the display panel is disposed on a substrate and includes a first sub-pixel having a first light-emitting region, a second sub-pixel adjacent to the first sub-pixel and disposed on the substrate and having a second light-emitting region, a pixel electrode disposed in the first sub-pixel, an insulating layer disposed between the pixel electrode and the substrate and including a plurality of recesses including a first recess and a second recess having a shape different from that of the first recess, a pattern portion disposed between the first sub-pixel and the second sub-pixel, and a display device including a reflective portion that overlaps the pattern portion.

16. The display device according to claim 15, further including a first data line electrically connected to the first sub-pixel through a connection portion of the pixel electrode, wherein the pattern portion surrounds at least most of an outer periphery of the pixel electrode of the first sub-pixel on a plane, the pattern portion is spaced apart from the pixel electrode, the connection portion of the pixel electrode crosses between adjacent portions of the pattern portion without covering the pattern portion on the plane, and a part of the first data line intersects the pattern portion without covering most of the pattern portion on the plane.

17. The display device according to claim 15, wherein the reflective portion is configured to redirect light emitted from the first sub-pixel and passing through one of the plurality of recesses in a direction toward the substrate.

18. The display device according to claim 15, wherein the pattern portion is a trench formed in the insulating layer, and a lowest surface of the trench is lower than the pixel electrode.

19. The trench surrounds at least a majority of the outer periphery of the pixel electrode of the first sub-pixel on a plane, The trench is separated from the pixel electrode, and the display device according to claim 18.

20. The cross-section of the trench has a "V" shape or a "U" shape in a non-light-emitting region between the first sub-pixel and the second sub-pixel, and the display device according to claim 18.

21. The reflective portion is a part of the reflective electrode of the first sub-pixel that continuously extends across the pattern portion, and the display device according to claim 15.

22. The first recess overlaps with an edge region of the pixel electrode, The second recess overlaps with a central region of the pixel electrode, and the display device according to claim 15.

23. The first recess in the edge region is wider than the second recess, and the display device according to claim 22.

24. The second recess is wider than the first recess in the edge region, and the display device according to claim 22.

25. A first depth of the first recess is different from a second depth of the second recess, and the display device according to claim 22.

26. The display device according to claim 15, further including a bank located at an end of the pixel electrode and overlapping with an inclined surface of the pattern portion.

27. The display device according to claim 15, further including a light-emitting layer disposed in the first sub-pixel and directly contacting the inclined surface of the pattern portion.

28. The insulating layer includes a first layer having a first refractive index and a second layer having a second refractive index greater than the first refractive index, The second layer is disposed between the pixel electrode and the first layer, and the display device according to claim 15.

29. The first recess is one of a plurality of first recesses of the first sub-pixel, The second recess is one of a plurality of second recesses of the first sub-pixel, A first aspect ratio of the plurality of first recesses is different from a second aspect ratio of the plurality of second recesses, and the display device according to claim 15.

30. The display device according to claim 15, further including a first data line electrically connected to the first sub-pixel, The first data line does not overlap with the pixel electrode.

31. A display panel according to claim 1, A gate driver that supplies a gate signal to a gate line connected to the first sub-pixel and the second sub-pixel, A display device including a data driving unit that supplies a data signal to a data line connected to the first sub-pixel and the second sub-pixel.

32. Further including a power supply line connected to the first sub-pixel, The pattern portion surrounds at least most of the outline of the pixel electrode in the first sub-pixel on a plane, The pattern portion is separated from the pixel electrode, A part of the power supply line crosses the pattern portion without covering most of the pattern portion on the plane, The display device according to claim 31, wherein a part of the first data line connected to the first sub-pixel intersects the pattern portion without covering most of the pattern portion on the plane.

Images