Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel may include a first sub-pixel and a second sub-pixel disposed on a substrate, the first sub-pixel being adjacent to the second sub-pixel, the first sub-pixel having a first light emitting area, and the second sub-pixel having a second light emitting area. The display panel further includes a pixel electrode disposed in the first sub-pixel and an insulating layer disposed between the pixel electrode and the substrate. The insulating layer includes a plurality of recesses including a first recess and a second recess having a different shape from the first recess. In addition, the display panel may further include a pattern portion disposed between the first sub-pixel and the second sub-pixel and a reflection portion overlapping the pattern portion.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0194666, filed on December 28, 2023, the entire contents of which are incorporated herein by reference as if fully set forth herein. Technical Field

[0003] The present disclosure relates to a display panel and a display device for displaying an image, having improved light extraction efficiency and an improved viewing angle. Background Art

[0004] Unlike liquid crystal display devices, since organic light - emitting display devices have a high response speed and low power consumption, and emit light by themselves without a separate light source, there is no problem with the viewing angle, and thus organic light - emitting display devices have received attention as next - generation flat - panel display devices.

[0005] Such a display device displays an image by the light emission of a light - emitting element layer including a light - emitting layer disposed between two electrodes.

[0006] In addition, there is a problem in that some 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 between the substrate and the air layer, and thus the light extraction efficiency of the display device may be reduced.

[0007] In addition, there is a problem that light mixing may occur between adjacent sub - pixels.

[0008] Therefore, there is a need to improve the light extraction efficiency of the display device.

[0009] In addition, there is a need to prevent light mixing between adjacent sub - pixels of the display device.

[0010] In addition, there is a need for a more luminous display device that can be made thinner with fewer layers and also reduce the number of manufacturing steps. Summary of the Invention

[0011] One aspect of the present disclosure relates to providing a display device in which the light extraction efficiency of light emitted from a light - emitting element layer can be improved.

[0012] One aspect of the present disclosure aims to provide a display device capable of providing an improved viewing angle.

[0013] One aspect of the present disclosure relates to providing a display device in which the light extraction efficiency can be maximized by light extraction from a non - light - emitting region.

[0014] One aspect of the present disclosure relates to providing a display device in which overall power consumption can be reduced by increasing light extraction from a non-light-emitting region.

[0015] The problems to be solved by examples of the present disclosure are not limited to those mentioned above, and from the following description, other problems not mentioned will be apparent to those of ordinary skill in the art to which the technical spirit of the present disclosure pertains.

[0016] An object of the present disclosure is to provide a display panel including: a first sub-pixel and a second sub-pixel disposed on a substrate, the first sub-pixel and the second sub-pixel being adjacent to each other, the first sub-pixel having a first light-emitting region and the second sub-pixel 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, the 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.

[0017] Another object of the present disclosure is to provide a display device including: a display panel including a plurality of sub-pixels; a gate driver configured to supply a gate signal to a gate line connected to the plurality of sub-pixels; and a data driver configured to supply a data signal to a data line connected to the plurality of sub-pixels, wherein the display panel includes: a first sub-pixel and a second sub-pixel disposed on a substrate, the first sub-pixel and the second sub-pixel being adjacent to each other, the first sub-pixel having a first light-emitting region and the second sub-pixel 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, the 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.

[0018] Yet another object of the present disclosure is to provide a display device including: a display panel according to an embodiment of the present disclosure; 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.

[0019] The technical advantages of the present disclosure are not limited to the above advantages, and those skilled in the art can clearly understand other advantages not mentioned above from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. In the drawings:

[0021] Figure 1 is a schematic top view of a display device according to an embodiment of the present disclosure.

[0022] Figure 2 is a schematic plan view showing one pixel according to an embodiment of the present disclosure Figure 1 as shown.

[0023] Figure 3 is a schematic cross-sectional view of line I-I' according to an embodiment of the present disclosure Figure 2 as shown.

[0024] Figure 4 is an enlarged view of part A according to an embodiment of the present disclosure Figure 3 of.

[0025] Figure 5 is a schematic cross-sectional view showing an exemplary variation of a display device according to an embodiment of the present disclosure.

[0026] Figure 6A is a schematic cross-sectional view of a display device according to another embodiment of the present disclosure.

[0027] Figure 6B is an enlarged view of part B according to an embodiment of the present disclosure Figure 6A of.

[0028] Figure 7A is a schematic cross-sectional view showing a variant example of a display device of a second embodiment of the present disclosure.

[0029] Figure 7B is an enlarged view of part C according to an embodiment of the present disclosure Figure 7A of.

[0030] Figure 8A is a schematic cross-sectional view of a display device according to another embodiment of the present disclosure.

[0031] Figure 8B is an enlarged view of part D according to an embodiment of the present disclosure Figure 8A of.

[0032] Figure 9A is a schematic cross-sectional view showing a variant example of a display device according to another embodiment of the present disclosure according to an embodiment of the present disclosure.

[0033] Figure 9B is according to an embodiment of the present disclosure Figure 9A An enlarged view of part F of Specific embodiments

[0034] Now, embodiments of the present disclosure will be described in detail, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in the drawings to refer to the same or similar parts. The advantages and features of the present disclosure and the methods for realizing them will be clarified by the embodiments described below with reference to the drawings.

[0035] However, the present disclosure may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0036] The shapes, sizes, ratios, angles, and numbers disclosed in the drawings used to describe the embodiments of the present disclosure are merely examples, and thus the present disclosure is not limited to the details shown.

[0037] Similar reference numerals always refer to similar elements. In the following description, when the detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present disclosure, the detailed description will be omitted.

[0038] In cases where "comprising", "having", and "including" described in this specification are used, another part may be added unless "only" is used. A term in the singular form may include the plural form unless otherwise indicated.

[0039] When interpreting an element, although not explicitly described, the element is interpreted as including an error range. When describing a positional relationship, for example, when the positional relationship between two parts is described as "on...", "above...", "below...", and "next to...", one or more other parts may be provided between the two parts unless "exactly" or "directly" is used.

[0040] When describing a time relationship, for example, when the time sequence is described as "after...", "subsequently", "next", and "before...", a discontinuous case may be included unless "immediately" or "directly" is used.

[0041] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms.

[0042] These terms are only used to distinguish one element from other elements. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0043] The "X-axis direction", "Y-axis direction", and "Z-axis direction" should not be interpreted only by the geometric relationship of being perpendicular to each other, and may have a broader directivity within the range where the elements of the present disclosure can function.

[0044] The term "at least one" should be understood to include any and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of the first item, the second item, and the third item" represents all combinations of items selected from the first item, the second item, and the third item, as well as two or more of the first item, the second item, or the third item.

[0045] As can be fully understood by those skilled in the art, the features of the various embodiments of the present disclosure can be partially or wholly coupled or combined with each other, and can interoperate with each other in various ways and be technically driven. The embodiments of the present disclosure can be executed independently of each other, or can be executed together in a mutually dependent relationship.

[0046] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. All components of each display device according to all embodiments of the present disclosure are operably coupled and configured.

[0047] Figure 1 is a schematic top view of a display device according to an embodiment of the present disclosure, Figure 2 shows Figure 1 a schematic top view of one pixel shown, and Figure 3 is Figure 2 a schematic cross-sectional view of line I-I' shown.

[0048] Hereinafter, with reference to Figure 2 , the first direction (e.g., the X-axis direction) is the horizontal direction, indicating the direction in which the gate line GL extends, the second direction (e.g., the Y-axis direction) is the vertical direction, indicating the direction in which the data line (e.g., the first data line DL1) extends, and the third direction (e.g., the Z-axis direction) is the direction intersecting each of the first direction (X-axis direction) and the second direction (Y-axis direction), indicating the thickness direction of the display device 100.

[0049] With reference to Figures 1 to 3, a display device 100 according to an embodiment of the present disclosure includes: a substrate 110 having a plurality of pixels P, the plurality of pixels P having a plurality of sub-pixels SP; a pattern portion 120 provided on the substrate 110 and recessed between the plurality of sub-pixels SP; and a reflection portion 130 inclinedly provided on the pattern portion 120.

[0050] The plurality of sub-pixels SP may include a plurality of recesses 140 spaced apart from the reflection portion 130 on the substrate 110. According to an example, the plurality of recesses 140 may include a first recess 141 provided adjacent to the pattern portion 120 and a second recess 142 connected to the first recess 141 and provided farther from the pattern portion 120 than the first recess 141. For example, the second recess 142 may be provided to be farther from the pattern portion 120 than the first recess 141 in a first direction (X-axis direction). The first recess 141 may have a different size from the second recess 142. For example, the first recess 141 may have an aspect ratio smaller than that of the second recess 142. For example, the first recess 141 may be larger and wider than the second recess 142. In addition, the depth of the first recess 141 may be the same as or substantially the same as the depth of the second recess 142, but the embodiments are not limited thereto. For example, according to another embodiment, the depth of the first recess 141 may be different from the depth of the second recess 142.

[0051] Referring to Figure 4 , according to an example, the aspect ratio of the first recess 141 may be the ratio of a first vertical length H1 from the center C1 of the first recess to the boundary of the first recess 141 to a first radius R1 of the first recess 141. Referring to Figure 4 , the boundary of the first recess 141 may refer to a surface where the interface between the first layer 1131 and the second layer 1132 of the coating layer 113 is lens-shaped (for example, the interface may be located on the upper surface or the uppermost surface of the first layer 1131). In addition, the coating layer 113 may be referred to as an insulating layer. The first vertical length H1 may be the vertical length from the center C1 of the first recess 141 to the boundary of the first recess 141, and may be in 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 boundary of the first recess 141, which may be in a direction parallel to the first direction (X-axis direction).

[0052] According to an example, the aspect ratio of the second recess 142 may be the ratio of a second vertical length H2 from the center C2 of the second recess 142 to the boundary of the second recess 142 to a second radius R2 of the second recess 142. The boundary of the second recess 142 is connected to the boundary of the first recess 141. Referring to Figure 4, the boundary of the second concave portion 142 may refer to the lens-shaped interface between the first layer 1131 and the second layer 1132 of the coating layer 113. The second vertical length H2 may be the vertical length from the center C2 of the second concave portion 142 to the boundary of the second concave portion 142, and may be in a direction parallel to the third direction (Z-axis direction). The second radius R2 of the second concave portion 142 is the horizontal length from the center C2 of the second concave portion 142 to the boundary of the second concave portion 142, which may be in a direction parallel to the first direction (X-axis direction).

[0053] The reason why the aspect ratio of the first concave portion 141 is smaller than that of the second concave portion 142 is to allow more light emitted from each of the plurality of sub-pixels SP to be incident on the first concave portion 141 to reach the reflection portion 130. In other words, if the first concave portion 141 at the edge of the light-emitting region is wider than the second concave portion 142, more light can reach the reflection portion 130 and be reflected out of the device, so as to improve the brightness and light extraction efficiency. For example, if the aspect ratio of the first concave portion 141 is smaller than that of the second concave portion 142, the cross-sectional length CL1 ( Figure 4 as shown) of the left boundary of the first concave portion 141 with respect to the center C1 of the first concave portion 141 may be longer than the cross-sectional length CL2 ( Figure 4 as shown) of the left boundary of the second concave portion 142 with respect to the center C2 of the second concave portion 142. Therefore, the light incident on the first concave portion 141 can have a larger amount of light refracted to the reflection portion 130 (or the left reflection portion) through the left boundary of the first concave portion 141 having a length (or area) larger than that of the second concave portion 142.

[0054] Since Figure 4 is an enlarged view of the left side portion of the sub-pixel SP, the length of the right boundary of the first concave portion 141 of the right side portion of the sub-pixel SP with respect to the center C1 of the first concave portion 141 may be longer than the length of the right boundary of the second concave portion 142 with respect to the center C2 of the second concave portion 142. Therefore, the light incident on the first concave portion 141 can have a larger amount of light refracted to the reflection portion 130 (or the right reflection portion) through the right boundary of the first concave portion 141 having a length (or area) larger than that of the second concave portion 142. In other words, a larger first concave portion 141 may be provided at the edge or perimeter of the pixel electrode 114 or around the edge region EDA to allow more light to be extracted from the device, while a smaller second concave portion 142 may be located inside, for example, surrounded by the first concave portion 141.

[0055] Accordingly, the display device 100 according to an embodiment of the present disclosure may have an aspect ratio of the first recess 141 smaller than that of the second recess 142, which may increase the amount of light reaching the reflecting portion 130 as compared to when the first and second recesses are formed with the same aspect ratio (or the same size). Thereby, the light extraction efficiency of the light guided to the outside of the substrate 110 (or the light extraction efficiency of the reflected light L1) is further improved.

[0056] In addition, the display device 100 according to an embodiment of the present disclosure may have an aspect ratio of the first recess 141 smaller than that of the second recess 142, such that the amount of light laterally emitted through the reflecting portion 130 may be increased as compared to when the first and second recesses are formed with the same aspect ratio (or the same size or the same width), thereby improving the viewing angle.

[0057] The display device 100 according to an embodiment of the present disclosure may be configured such that a first radius R1 of the first recess 141 is greater than a second radius R2 of the second recess 142, and a first vertical length H1 of the first recess 141 is equal to a second vertical length H2 of the second recess 142. Accordingly, the aspect ratio of the first recess 141 may be smaller than that of the second recess 142.

[0058] On the other hand, in the display device 100 according to an embodiment of the present disclosure, a width W of an edge region EDA in which at least a part of the first recess 141 is overlapped may be determined by a mathematical formula. For example, the width W of the edge region EDA may be obtained through a mathematical expression related to a vertical distance between the organic light emitting layer 116 and the substrate 110 and a maximum angle at which the light emitted from the organic light emitting layer 116 is guided to the outside of the substrate 110 without total reflection from the upper surface 110a of the substrate 110. This will be described later in conjunction with the mathematical expression and Figure 4 will be described.

[0059] The display device 100 according to an embodiment of the present disclosure may be configured such that at least a part of the first recess 141 is disposed (or disposed to overlap) in the edge region EDA, such that the amount of light refracted through the first recess 141 toward the reflecting portion 130 may be increased, thereby maximizing the light extraction efficiency. According to an example, the edge region EDA is a region including an edge portion of the light emitting region EA, and this region may be a region surrounding the central region ECA of the sub-pixel.

[0060] Hereinafter, with reference to Figures 1 to 3 , the display device 100 according to an embodiment of the present specification will be described in more detail.

[0061] 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 that at least partially overlap with the light-emitting region EA.

[0062] The light-emitting region EA is a region from which light is emitted and may be included in the display region DA. As Figure 3 shown, the light-emitting region EA may be spaced apart from the pattern portion 120. For example, the pattern portion 120 may have a shape or form similar to a groove, depression, or moat that surrounds or mostly surrounds each sub-pixel. Since the reflection portion 130 is provided on the pattern portion 120 (e.g., in the groove), the light-emitting region EA may be spaced apart from the reflection portion 130. For example, the light-emitting region EA may be spaced apart from the reflection portion 130 by a first distance D1 (e.g., as Figure 4 shown). The first distance D1 may be the shortest horizontal distance between the light-emitting region EA and the reflection 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 between the point where the organic light-emitting layer 116 contacts the edge region of the pixel electrode 114 and the point on the lower surface of the reflection portion 130 in the region overlapping with the groove or the pattern portion 120 (e.g., see Figure 4 ).

[0063] The non-light-emitting region NEA is a region from which light is not emitted or generated and may be a region adjacent to the light-emitting region EA. The non-light-emitting region NEA may be referred to as a perimeter region. The reflection portion 130 is spaced apart from the plurality of recesses 140 (or the light-emitting region EA) and may be provided in the non-light-emitting region NEA (e.g., in the region between adjacent sub-pixels).

[0064] Therefore, in the display device 100 according to an embodiment of the present disclosure, since the reflection portion 130 provided in the non-light-emitting region NEA can reflect the light emitted from the light-emitting region EA and directed toward an adjacent sub-pixel back toward the sub-pixel SP for light emission, the light efficiency (or light extraction efficiency) of the sub-pixel SP for light emission can be improved and color mixing between adjacent sub-pixels can be prevented.

[0065] On the other hand, the reflection portion 130 according to an example may be inclinedly provided on the pattern portion 120 in the non-light-emitting region NEA (e.g., on a depression or a groove). Therefore, the light among the light refracted by the plurality of recesses 140 and directed toward the reflection portion 130 can be reflected by the inclinedly provided reflection portion 130 and guided to the outside of the substrate 110 (e.g., out of the display device and toward the user's eyes).

[0066] According to an 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 an example, the first area A1 may be a bank area where a bank (or bank 115 covering the edge of the pixel electrode 114) defining the emitting area EA is provided. For example, the bank 115 may be provided on the opposite side of the pattern portion 120 (e.g., on the opposite side of the trench / depression). In this way, the height of the reflective inclined portion of the reflective portion 130 can be increased, and the slope can be adjusted or made steeper to control more light to be reflected out of the device. According to an example, the second area A2 may be a bankless area (e.g., an area between the opposite sides of the trench or the pattern portion 120) where no bank is provided in the non-emitting area NEA. According to another example, the first area A1 may be an area of the second layer 1132 adjacent to the emitting area EA and partially provided with the coating layer 113, as Figure 5 shown. According to another example, the second area A2 may be adjacent to the first area A1 and may be an area where the organic light-emitting layer 116 contacts the bottom surface 120b of the pattern portion 120, as Figure 5 shown. For example, the second area A2 may correspond to the exposed lower surface of the trench or the pattern portion 120 (e.g., the bottom exposed by the bank or the second layer 1132 of the coating layer 113 according to an embodiment).

[0067] Return reference Figure 3 , according to an example, the pattern portion 120 may be formed as a recess (e.g., a depression, moat, or trench configuration) in the non-emitting area NEA. For example, the pattern portion 120 may be formed as a recess in the coating layer 113 on the substrate 110. For example, the pattern portion 120 may be formed by etching or excavating material from the upper surface of the coating layer 113, but the embodiment is not limited thereto. The pattern portion 120 may be of a trench type surrounding the sub-pixel or partially surrounding the sub-pixel. The pattern portion 120 may be provided to be spaced apart from the emitting area EA. According to an example, the pattern portion 120 may be provided in the form of a slit or a trench surrounding the emitting area EA. According to another embodiment, the pattern portion 120 may be of a hole type that extends through the coating layer 113 to expose the layer therebelow. For example, the width of the pattern portion 120 may be formed to decrease from the reflective portion 130 toward the substrate 110 (e.g., the cross-section of the pattern portion 120 may have an inverted conical shape with respect to the substrate). In addition, as Figure 3 shown, the pattern portion 120 may include an exposed area (e.g., the upper surface of the first layer 1131) of the coating layer 113 not covered by the bank 115. Therefore, the pattern portion 120 may be represented by terms such as trenches, slits, depressions, moats, grooves, bank slits, and bank trenches, but the embodiment is not limited thereto. As Figure 3As shown, 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 recessed.

[0068] According to an example, the reflecting portion 130 may be formed to be recessed along the contour of the pattern portion 120 formed in the recessed non-light-emitting region NEA, so as to be formed in the recessed non-light-emitting region NEA (for example, the cross-section of the reflecting portion 130 may form a "V" shape or a "U" shape type between adjacent sub-pixels). The reflecting portion 130 may be made of a material capable of reflecting light, and may reflect the light emitted from the light-emitting region EA and guided toward the adjacent sub-pixels SP back toward the light-emitting region EA for light emission. In other words, the reflecting portion 130 may redirect the light traveling toward the adjacent sub-pixels and change its path to be reflected out of the display device (for example, color mixing can be prevented and the light extraction efficiency can be improved). As Figure 3 shown, the reflecting portion 130 is inclinedly disposed on the pattern portion 120 while surrounding the light-emitting region EA, so the reflecting portion 130 may be represented by terms such as a side reflecting portion, an inclined reflecting portion, a reflecting inclined portion, or a reflecting ramp portion.

[0069] In addition, the display device 100 according to an embodiment of the present disclosure may be implemented as a bottom emission type in which the light emitted from the light-emitting region EA is guided to the bottom surface of the substrate 110. Thus, as Figure 3 shown, in the display device 100 according to an embodiment of the present disclosure, the light emitted from the lower surface of the substrate 110 may be a combination of reflected light L1 and direct light L2. In other words, the small second recess 142 overlapping the intermediate region of the sub-pixel may help align or generate more direct light L2 directly toward the user's eyes, while the larger first recess 141 may be located at the edge or perimeter of the sub-pixel to help clear the light escaping in the lateral type direction and redirect or convert it into reflected light L1 so that it can be directed toward the user's eyes. The reflected light L1 may mean the light that a part of the light emitted from the light-emitting region EA is refracted by at least one recess 140, reflected by the reflecting portion 130, and then emitted to the bottom surface of the substrate 110. The direct light L2 may mean the light that a part of the light emitted from the light-emitting region EA is refracted by at least one recess 140 and directly emitted to the bottom surface of the substrate 110. Therefore, compared with a display device not provided with the inclinedly disposed reflecting portion 130, the display device 100 according to an embodiment of the present disclosure may have improved light extraction efficiency and may prevent color mixing between adjacent sub-pixels.

[0070] Referring to Figure 1 andFigure 2 According to one embodiment of the present disclosure, the display device 100 may further include a display panel, a plurality of recesses 140, a source driver integrated circuit (hereinafter referred to as "IC") 150, a flexible film 160, a circuit board 170, and a timing control unit 180. Herein, the display panel includes a gate driver GD, and the plurality of recesses 140 overlap at least a part of the light-emitting region EA.

[0071] The display panel may include a substrate 110 and a counter substrate 200 (shown in Figure 3 ).

[0072] The substrate 110 may include thin film transistors 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.

[0073] 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 provided in the central portion of the display panel. The display area DA may include a plurality of pixels P.

[0074] The counter substrate 200 may encapsulate (or seal) the display area DA provided on the substrate 110. For example, the counter substrate 200 may be bonded to the substrate 110 via an adhesive member (or transparent glue). The counter substrate 200 may be an upper substrate, a second substrate, or a package substrate.

[0075] The gate driver GD supplies a gate signal to the gate line according to a gate control signal input from the timing controller 190. The gate driver GD may be formed in a gate driver in panel (GIP) method on one side of the light-emitting region EA or in a non-light-emitting region NEA outside both sides of the light-emitting region EA, as Figure 1 shown.

[0076] The non-display area NDA is an area where no image is displayed and may be a peripheral area, a signal supply area, a non-active area, or a border area. The non-display area NDA may be configured to be near the display area DA. That is, the non-display area NDA may be provided to surround the display area DA.

[0077] A pad area PA may be provided in the non-display area NDA. The pad area PA may supply power and / or signals for outputting an image to the pixels P provided in the display area DA. Referring to Figure 1 , the pad area PA may be provided above the display area DA.

[0078] The source driver IC 150 receives digital video data and a source control signal from the timing controller 180. The source driver IC 150 converts the digital video data into an analog data voltage according to the source control signal and supplies the analog data voltage to the data lines. Accordingly, the data lines can supply data signals to each of a plurality of sub-pixels. When the source driver IC 150 is manufactured as a driving chip, the source driver IC 150 can be encapsulated in the flexible film 160 by a chip on film (COF) method or a chip on plastic (COP) method.

[0079] Pads such as data pads can be formed in the non-display area NDA of the display panel. Lines connecting the pads to the source driver IC 150 and lines connecting the pads to the circuit board 170 can be formed in the flexible film 160. The flexible film 160 can be attached to the pads by using an anisotropic conductive film, whereby the pads can be connected to the lines of the flexible film 160.

[0080] The circuit board 170 can be attached to the flexible film 160. A plurality of circuits implemented as driving chips can be packaged in the circuit board 170. For example, the timing controller 180 can be packaged in the circuit board 170. The circuit board 170 can be a printed circuit board or a flexible printed circuit board.

[0081] The timing controller 180 receives digital video data and a timing signal from an external system board through a cable of the circuit board 170. The timing controller 180 generates a gate control signal for controlling the operation timing of the gate driver GD and a source control signal for controlling the source driver IC 150 based on the timing signal. The timing controller 180 supplies the gate control signal to the gate driver GD and supplies the source control signal to the source driver IC 150.

[0082] Refer to Figure 3 , the substrate 110 according to the example can include a light-emitting area EA and a non-light-emitting area NEA.

[0083] The light-emitting region EA may refer to a region where light is emitted and is 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 provided. 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 a shape that is the same as or similar to the shape of the pixel electrode 114. This is because light can be emitted from the organic light-emitting layer 116 according to the formation of the electric field of 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. According to an example, the pattern portion 120 is provided to surround the light-emitting region EA, and thus, the pattern portion 120 (e.g., a trench or a recess) may be formed along the shape of the pixel electrode 114. For example, the pattern portion 120 may be spaced apart from the pixel electrode 114 and may extend around the outer perimeter of the pixel electrode 114. The light-emitting region EA may include an edge region EDA and a center region ECA.

[0084] According to an example, the edge region EDA may be a region provided adjacent to the reflective portion 130 in the non-light-emitting region NEA. The center region ECA according to an example may be a region provided farther from the reflective portion 130 than the edge region EDA. As Figure 3 shown, the center region ECA may be a region including the center of the light-emitting region EA. In addition, the edge region EDA may be a region including the edge of the light-emitting region EA and may be a region surrounding the center region ECA.

[0085] In the display device 100 according to an embodiment of the present disclosure, at least a part of the first recess 141 may be provided to overlap with the edge region EDA. Although Figure 3 only one first recess 141 overlapping with the edge region EDA partially is shown, at least one (or more) of the first recesses 141 may overlap with the edge region EDA according to the aspect ratio of the first recess 141. According to an example, the second recess 142 may be provided to overlap with the center region ECA. As Figure 3 shown, at least one (or more) of the second recesses 142 may be provided to overlap with the center region ECA. However, it is not limited thereto, and only one second recess 142 may be provided to overlap with the center region ECA.

[0086] As described above, the first recess 141 may be configured to have a smaller aspect ratio than the second recess 142. Thus, the display device 100 according to an embodiment of the present disclosure may have an increased amount of light reaching the reflective portion 130 disposed obliquely on the pattern portion 120, which may result in improved viewing angles and / or light extraction efficiency and may better prevent color mixing between adjacent sub-pixels compared to the case where the first and second recesses are formed with the same aspect ratio (or the same size). In addition, the configuration of the reflective portion 130 and the pattern portion 120 may allow the display device to be thinner while also improving light extraction and preventing color mixing, since additional layers and elements such as additional black matrices may be avoided, omitted, or made smaller.

[0087] Return reference Figure 2 , according to the example, the light-emitting region EA may include gate lines, data lines, pixel driving power lines, 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 lines and the data lines.

[0088] Meanwhile, at least four sub-pixels among the plurality of sub-pixels SP that are configured to emit different colors and are disposed adjacent to each other may constitute one pixel P (or 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 include three sub-pixels SP that are configured to emit light of different colors and are disposed adjacent to each other. For example, one pixel P may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0089] Each of the plurality of sub-pixels SP includes 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 organic light-emitting layer) disposed between the pixel electrode and the reflective electrode.

[0090] The light-emitting layers respectively disposed in the plurality of sub-pixels SP may emit light of different colors individually or emit white light together. Since the light-emitting layers of each of the plurality of sub-pixels SP emit white light together, each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel may include a color filter CF (or wavelength conversion member CF) for converting the white light into light of its corresponding different color. In this case, the white sub-pixel may not include a color filter.

[0091] In the display device 100 according to an embodiment of the present disclosure, the region where the red color filter is provided may be the red sub-pixel or the first sub-pixel, the region where the green color filter is provided may be the green sub-pixel or the second sub-pixel, the region where the blue color filter is provided may be the blue sub-pixel or the third sub-pixel, and the region where no color filter is provided may be the white sub-pixel or the fourth sub-pixel.

[0092] When a gate signal is input from a gate line by using a thin film transistor, each of the sub-pixels SP supplies a predetermined current to the organic light emitting element according to the data voltage of the data line. To this end, the light emitting layer of each sub-pixel may emit light having a predetermined brightness according to the predetermined current.

[0093] A plurality of sub-pixels SP according to the 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 (or sequentially) to each other 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, but is not limited thereto. However, 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.

[0094] Each of the first sub-pixel SP1 to the fourth sub-pixel SP4 may include a light emitting region EA and a circuit region. The light emitting region EA may be provided on one side (or upper side) of the sub-pixel region, and the circuit region CA may be provided on the other side (or lower side) of the sub-pixel region. For example, as Figure 2 shown, the circuit region CA may be provided below the light emitting region EA based on a second direction (Y-axis direction). The light emitting regions EA of the first sub-pixel SP1 to the fourth sub-pixel SP4 may have the same size (or area) as each other, or different sizes (or areas) from each other.

[0095] The first sub-pixel SP1 to the fourth sub-pixel SP4 may be arranged adjacent to each other in the first direction (X-axis direction). For example, two data lines extending in the second direction (Y-axis direction) may be arranged parallel to each other 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. A pixel power line EVDD extending in the first direction (X-axis direction) may be provided between the light emitting region EA and the circuit region of each of the first sub-pixel SP1 to the fourth sub-pixel SP4. The gate line GL and the sense line SL may be provided below the circuit region CA. A pixel power line EVDD extending in the second direction (Y-axis direction) (in Figure 2As shown, it may be disposed on one side of the first sub-pixel SP1 or the fourth sub-pixel SP4. A reference line RL extending in the second direction (Y-axis direction) may be disposed between the second sub-pixel SP2 and the third sub-pixel SP3. The reference line RL may be used as a sensing line for sensing changes in the characteristics of the driving thin film transistor from the outside and / or changes in the characteristics of the light emitting element layer provided in the circuit region CA in the sensing driving mode of the pixel P. At least a part of the reference line RL according to an example may overlap with the pattern portion 120. As Figure 2 shown, at least a part of the reference line RL according to the example may overlap with the pattern portion 120. The data lines may 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.

[0096] In the display device 100 according to an embodiment of the present disclosure, the data line (e.g., the first data line DL1) may be arranged not to overlap with the light emitting region EA and the reflection portion 130 (or the reflection portion 117a), where the reflection portion 130 is provided on the pattern portion 120. For example, as Figure 3 shown, the first data line DL1 may be arranged to overlap with the first region A1. Therefore, it is possible to prevent the display device 100 according to an embodiment of the present disclosure from reducing the light extraction efficiency because the first data line DL1 does not block (or interfere with) the light reflected by the reflection portion 130 (or the reflection portion 117a). The second data line DL2, the third data line DL3, and the fourth data line DL4 may be disposed in the first region A1 of the corresponding sub-pixel, such as the first data line DL1, so that the light emitting region EA and the reflection portion 117a of the corresponding sub-pixel do not overlap in the third direction (Z-axis direction). Therefore, in the display device 100 according to an embodiment of the present disclosure, the data lines DL1, DL2, DL3, DL4 may have a structural feature of not overlapping with the pattern portion 120. In other words, the configurations of the reflection portion 130 and the pattern portion 120 may be mainly spaced apart from the wirings (e.g., RL, DL, EVDD, etc.) without overlapping in the plan view, so that the wirings do not block too much light reflected by the configurations of the reflection portion 130 and the pattern portion 120 (e.g., see Figure 2 ).

[0097] However, without being limited thereto, according to another example, the first data line DL1 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 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.

[0098] In the display device 100 according to an embodiment of the present disclosure, each of the data lines DL1, DL2, DL3, DL4 may extend in a second direction (Y-axis direction) intersecting the first direction (X-axis direction) between a plurality of sub-pixels SP arranged in the first direction (X-axis direction). The pattern portion 120 according to an example may partially overlap with the data lines DL1, DL2, DL3, DL4 in the first direction (X-axis direction) and the second direction (Y-axis direction), as Figure 2 shown. As Figure 2 shown, the pattern portion 120 is arranged to surround most of the light-emitting region EA.

[0099] In the display device 100 according to an embodiment of the present disclosure, each of the plurality of sub-pixels SP may include a plurality of recesses 140. The plurality of recesses 140 may be formed on the coating layer 113 to partially overlap with the light-emitting region EA of the sub-pixel. By forming the plurality of recesses 140 on the coating layer 113 of the light-emitting region EA to have a curved (or uneven) shape, the plurality of recesses 140 change the forward path of the light emitted from the light-emitting element layer E to improve the light extraction efficiency. For example, the plurality of recesses 140 may be a non-planar portion, an irregular pattern portion, a microlens portion, or a light-scattering pattern portion.

[0100] The plurality of recesses 140 may be formed to be recessed into the interior of the coating layer 113. For example, the plurality of recesses 140 may be recessedly formed on the upper surface 1131a of the first layer 1131 included in the coating layer 113. Accordingly, the first layer 1131 may include the plurality of recesses 140. The first layer 1131 may be arranged between the substrate 110 and the light-emitting element layer E in a third direction (Z-axis direction). The recess 140 may 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 farther from the pattern portion 120 than the first recess 141.

[0101] The second layer 1132 of the coating layer 113 may be arranged between the first layer 1131 and the light-emitting element layer E (or Figure 3between the pixel electrodes 114 shown in []. The second layer 1132 according to an example may be formed to be wider than the pixel electrode 114 in the first direction (X-axis direction). Accordingly, a part of the second layer 1132 may overlap with the light-emitting region EA, and the remaining part may contact a part of the bottom surface 120b while covering the inclined surface 120s of the covering pattern portion 120. That is, as Figure 3 shown, 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 covering pattern portion 120. Since the upper surface 1132a of the second layer 1132 may be set to be flat, the pixel electrode 114 disposed on the upper surface 1132a of the second layer 1132 may also be flat. The organic light-emitting layer 116 may be disposed on the pixel electrode 114.

[0102] On the other hand, the refractive index of the second layer 1132 may be greater than the refractive index of the first layer 1131. Accordingly, as Figure 3 shown, a part of the light emitted from the organic light-emitting layer 116 and guided toward the substrate 110 may be refracted by the difference in refractive index between the second layer 1132 and the first layer 1131 in which the plurality of recesses 140 are formed and changed in path toward the reflection portion 130. For example, as Figure 3 shown, a part of the light emitted from the organic light-emitting layer 116 and guided toward the substrate 110 may be refracted by the first recess 141 disposed adjacent to the pattern portion 120, and then form an optical path toward the reflection portion 130 (for example, the light may be aligned more straightly via the difference in refractive index so that it better reaches the user's eyes, for example, the dotted line L2). Accordingly, the light forming a path to the reflection portion 130 through the first recess 141 may be reflected by the reflection portion 130 and guided toward the light-emitting region EA of the sub-pixel SP that emits light. Accordingly, the display device 100 according to an embodiment of the present disclosure may improve the viewing angle by increasing the amount of light refracted to the reflection portion 130 by the first recess 141 provided at the edge of the plurality of recesses 140, thereby increasing the amount of light reflected by the reflection portion 130 and guided to the outside of the substrate 110. Hereinafter, the light reflected by the reflection portion 130 and guided toward the substrate 110 is defined as reflected light L1.

[0103] On the other hand, in Figure 3In [the figure], only the light reflected by the reflection part 130 and guided to the light-emitting area EA of the emission sub-pixel SP (or the first sub-pixel SP1) is shown as an example, but the light reflected by the reflection part 130 can be guided from the non-light-emitting area NEA surrounding the emission sub-pixel SP (or the first sub-pixel SP1). Therefore, the display device 100 according to an embodiment of the present disclosure can maximize the light extraction efficiency because, due to the reflection part 130 provided in the non-light-emitting area NEA, light can be extracted as reflected light L1 even in the non-light-emitting area NEA.

[0104] According to an embodiment of the present disclosure, the display device 100 may further include light that is not reflected by the reflection part 130 and is incident on the substrate 110 through the plurality of recesses 140. For example, as Figure 3 shown by the dashed line in [the figure], the display device 100 may further include direct light L2 that is emitted from the organic light-emitting layer 116, is incident on the plurality of recesses 140, is refracted at the boundary of each of the plurality of recesses 140 (or at the interface between the second layer 1132 and the first layer 1131), and is then directly guided to the substrate 110 and exits the display device. Therefore, the display device 100 according to an embodiment of the present disclosure can guide the light L1 in the form of reflected light L1 and the light L2 in the form of direct light L2 to the outside of the substrate 110 through the plurality of recesses 140 and the reflection part 130, thereby improving the overall light extraction efficiency.

[0105] In the display device 100 according to an embodiment of the present disclosure, since the pattern part 120 is provided to surround the light-emitting area EA, at least a part of the reflection part 130 on the pattern part 120 can be provided to surround the light-emitting area EA. Therefore, the reflected light can be emitted toward the substrate 110 from a position that surrounds at least a part of the light-emitting area EA while being spaced apart from the light-emitting area EA. Therefore, in the display device 100 according to an embodiment of the present disclosure, since the light dissipated by the waveguide (or optical waveguide) and / or the light dissipated by the total internal reflection at the interface can be emitted from the non-light-emitting area NEA in the form of reflected light through the reflection part 130 that surrounds at least a part of the light-emitting area EA, the light extraction efficiency can be improved and the overall light-emitting efficiency can be increased.

[0106] Hereinafter, the structure of each of the plurality of sub-pixels SP will be described in detail.

[0107] Referring to Figure 3 , the display device 100 according to an embodiment of the present disclosure may further include a buffer layer BL, a circuit element layer, a thin film transistor, a pixel electrode 114, a bank 115, an organic light-emitting layer 116, a reflective electrode 117, a packaging layer 118, and a color filter CF.

[0108] More specifically, each of the sub-pixels SP according to one embodiment may include: a circuit element layer disposed on the upper surface of the buffer layer BL, the circuit element layer including a gate insulating layer, an interlayer insulating layer 111, and a passivation layer 112; a coating layer 113 disposed on the circuit element layer; a pixel electrode 114 disposed on the coating layer 113; a bank 115 covering the edge 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 encapsulation layer 118 on the reflective electrode 117.

[0109] A thin-film transistor for driving the sub-pixel SP may be disposed on the circuit element layer. The circuit element layer may be expressed in terms 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.

[0110] 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 on the entire surface (or front surface) of the substrate 110. A pixel power line EVDD for pixel driving may be disposed between the buffer layer BL and the substrate 110. However, it is not limited thereto, and the pixel power line EVDD may be disposed between the substrate 110 and the buffer layer BL. The buffer layer BL may be used to block the outgassing or diffusion of the materials contained in the substrate 110 into the transistor layer during the high-temperature process of the thin-film transistor manufacturing process. Optionally, the buffer layer BL may be omitted in some cases.

[0111] The 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, which are formed in the thin-film transistor region of the circuit region of the sub-pixel SP. The drain region and the source region may be spaced apart in parallel from each other, with the channel region therebetween.

[0112] The active layer may be formed of a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxides, and organic materials.

[0113] The gate insulating layer may be formed on the channel region of the active layer. As an example, the gate insulating layer may be formed in an island shape only on the channel region of the active layer, or may be formed on the entire front surface of the substrate 110 including the active layer or the buffer layer BL.

[0114] The gate electrode may be formed on the gate insulating layer to overlap with the channel region of the active layer.

[0115] The interlayer insulating layer 111 may be formed 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 above the entire light-emitting region where the circuit region and the sub-pixel SP emit light.

[0116] The source electrode can be electrically connected to the source region of the active layer through a source contact hole provided in an interlayer insulating layer overlapping with the source region of the active layer. The drain electrode can 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.

[0117] The drain electrode and the source electrode can be made of the same metal material. For example, each of the drain electrode and the source electrode can be made of a single metal layer, a single alloy layer, or a multi-layer of two or more layers that is the same as or different from the material of the gate electrode.

[0118] Meanwhile, in the display device 100 according to an embodiment of the present disclosure, the substrate 110 may include a connection area CNA where thin film transistors in the connection circuit area CA and the pixel electrode 114 are connected. The connection area CNA according to an example is an area where thin film transistors in the connection circuit area CA and the pixel electrode 114 are connected. As Figure 2 shown, the connection area CNA according to an example may be an area between the light emitting area EA and the circuit area CA. Since the connection area CNA is an area where the thin film transistor 112 and the pixel electrode 114 are connected, the pattern portion 120 may not be formed in the connection area CNA. For example, the pattern portion 120 may have a small disconnection area to allow a wiring connection to pass through it. This is because if the pattern portion 120 is formed in the connection area CNA, the thickness of the pixel electrode 114 may become thinner due to the step difference of the pattern portion 120, which may cause a short circuit of the pixel electrode 114. Therefore, in the display device 100 according to an embodiment of the present disclosure, the pattern portion 120 is not formed in the connection area CNA, thereby preventing the connection between the pixel electrode 114 and the thin film transistor 112 from being weakened.

[0119] In addition, the circuit area may further include a first switching thin film transistor, a second switching thin film transistor, and a capacitor provided together with the thin film transistor. Since each of the first switching thin film transistor and the second switching thin film transistor is provided on the circuit area of the sub-pixel SP to have the same structure as that of the thin film transistor, its description will be omitted. The capacitor can be provided in an overlapping area between the gate electrode and the source electrode of the thin film transistor, where the gate electrode and the source electrode overlap each other, and the interlayer insulating layer 111 is disposed therebetween.

[0120] In addition, in order to prevent the threshold voltage of the thin film transistor provided in the pixel region from shifting due to light, the display panel or the substrate 110 may further include a light shielding layer disposed under the active layer of at least one of the thin film transistor, the first switching thin film transistor, or the second switching thin film transistor. The light shielding layer may be disposed between the substrate 110 and the active layer to block the light incident on the active layer through the substrate 110, thereby minimizing the change in the threshold voltage of the transistor caused by external light. In addition, since the light shielding layer is disposed between the substrate 110 and the active layer, the thin film transistor can be prevented from being seen by the user.

[0121] The passivation layer 112 may be disposed on the substrate 110 to cover the pixel region. The passivation layer 112 covers the drain electrode, the source electrode, and the gate electrode of the thin film transistor and the buffer layer. Between the passivation layer 112 and the interlayer insulating layer 111 are data lines. For example, as Figure 3 shown, a first data line DL1 and a second data line DL2 may be provided. The first data line DL1, the second data line DL2, and the pixel power line EVDD may be disposed in the non-light emitting region NEA so as not to obscure the light emitting region EA. The passivation layer 112 may be formed in the entire circuit region CA and the light emitting region EA. These passivation layers 112 may also be omitted. The color filter CF may be disposed on the passivation layer 112.

[0122] The coating layer 113 may be disposed on the substrate 110 to cover the passivation layer 112 and the color filter CF. When the passivation layer 112 is omitted, the coating layer 113 may be disposed on the substrate 110 to cover the circuit region. The coating layer 113 may be formed in the light emitting region EA and the circuit region where the thin film transistor is disposed. In addition, the coating layer 113 may be formed in the non-display region NDA other than the pad region PA and the entire display region DA. For example, the coating layer 113 may include an extension (or enlargement) extending or expanding from the display region DA to the other non-display region NDA other than the pad region PA. Therefore, the coating layer 113 may have a size relatively wider than the size of the display region DA.

[0123] The coating layer 113 according to one example may be formed to have a relatively thick thickness, thereby providing a flat surface on the display region DA and the non-display region NDA. For example, the coating layer 113 may be made of an organic material such as photoacrylic acid, benzocyclobutene, polyimide, and fluororesin.

[0124] The coating layer 113 formed in the display area DA (or the light-emitting area EA) may include a plurality of recesses 140 (e.g., the recesses 140 may have a corrugated shape or a dented shape). In addition, the recesses 140 may be alternately arranged in a plan view (e.g., a honeycomb arrangement). The plurality of recesses 140 are elements for improving the light efficiency of the light-emitting area EA and may be formed inside the coating layer 113. Specifically, as Figure 3 shown, the plurality of recesses 140 may be formed in a recessed shape on the first layer 1131 of the coating layer 113. The plurality of recesses 140 (or the first recess 141 and the second recess 142) may be connected to each other.

[0125] A second layer 1132 having a refractive index higher than that of the first layer 1131 may be formed on the first layer 1131 (e.g., refractive index of 1132 > refractive index of 1131). According to the difference in refractive index between the second layer 1132 and the first layer 1131, the path of the light emitted from the light-emitting element layer E and directed toward an adjacent sub-pixel SP may be changed toward the reflecting portion 130. The second layer 1132 may be provided to cover the plurality of recesses 140 provided in the first layer 1131 such that the upper surface 1132a may be flat.

[0126] The pixel electrode 114 is formed on the upper surface 1132a of the second layer 1132 such that the pixel electrode 114 may be provided to be flat, and the organic light-emitting layer 116 and the reflective electrode 117 formed on the pixel electrode 114 may also be provided to be flat. Since the pixel electrode 114, the organic light-emitting layer 116, the reflective electrode 117, that is, the light-emitting element layer E are provided to be flat in the light-emitting area EA, the thickness of each of the pixel electrode 114, the organic light-emitting layer 116, and the reflective electrode 117 in the light-emitting area EA may be uniformly formed. Therefore, the organic light-emitting layer 116 may emit light uniformly in the light-emitting area EA without deviation.

[0127] The plurality of recesses 140 may be formed on the first layer 1131 by a photolithography process using a mask having an opening portion, and then patterned (or etched) or ashed after coating the first layer 1131 to cover the passivation layer 112 and the color filter CF, but the embodiment is not limited thereto. The plurality of recesses 140 may be formed in an area overlapping with the color filter CF and / or an area not overlapping with the bank 115 of the non-light-emitting area NEA. However, the embodiment is not limited thereto, and the first recess 141 among the plurality of recesses 140 may be formed to partially overlap with the bank 115.

[0128] On the other hand, in the display device 100 according to an embodiment of the present disclosure, the aspect ratio of the first recess 141 is set to be smaller than the aspect ratio of the second recess 142, so that the first radius R1 of the first recess 141 and the second radius R2 of the second recess 142 can be set to be different. When the sizes of the openings of the mask are different, the first recess 141 and the second recess 142 can be formed to have different radii. Therefore, the display device 100 according to an embodiment of the present disclosure can be formed with 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.

[0129] Return reference Figure 3 , the color filter CF provided in the light-emitting region EA can be provided between the substrate 110 and the coating layer 113. Therefore, the color filter CF can be provided between the pixel power line EVDD (e.g., the pixel power line EVDD) and the reflection part 130 or between the pixel driving line and the pattern part 120. The color filter CF can include a red color filter (or first color filter) CF1 for converting the white light emitted from the organic light-emitting layer 116 into red light, a blue color filter (or second color filter) CF2 for converting the white light into blue light, and a green color filter (or third color filter) CF3 for converting the white light into green light. The fourth sub-pixel as a white sub-pixel may not include a color filter because the organic light-emitting layer 116 emits white light.

[0130] The display device 100 according to an embodiment of the present disclosure can be arranged such that color filters having different colors partially overlap at the boundary portions of the plurality of sub-pixels SP. For example, as Figure 3 shown, 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 (e.g., a type of black matrix is formed in the region between adjacent sub-pixels). Therefore, the display device 100 according to an embodiment of the present disclosure can prevent the light emitted from each sub-pixel from being guided to adjacent sub-pixels due to the overlapping color filters at the boundary portions of the sub-pixels, thereby preventing color mixing between sub-pixels. In addition, the overlapping region of the color filters (e.g., the black matrix portion) can overlap with the center of the configurations of the reflection part 130 and the pattern part 120 to better prevent color mixing between sub-pixels.

[0131] The pixel electrode 114 of the sub-pixel SP may be formed on the coating layer 113. The pixel electrode 114 may be connected to the drain electrode or the source electrode of the thin film transistor through a contact hole passing through the coating layer 113 and the passivation layer 112. The edge portion of the pixel electrode 114 may be covered by the bank 115.

[0132] Since the display device 100 according to an embodiment of the present disclosure is configured as a bottom emission type, the pixel electrode 114 may be formed of a transparent conductive material (or TCO) capable of transmitting light, such as indium tin oxide (ITO) or indium zinc oxide (IZO), or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of Mg and Ag.

[0133] Meanwhile, the material constituting the pixel electrode 114 may include MoTi. The pixel electrode 114 may be a first electrode or an anode electrode.

[0134] The bank 115 is an area from which light is not emitted, and may be provided to surround each of the light emitting portions (or recessed portions 141) of each of the plurality of sub-pixels SP. That is, the bank 115 may separate (or define) each of the light emitting portions or the recessed portions 141 of the sub-pixels SP. The light emitting portion may mean a portion where the pixel electrode 114 and the reflective electrode 117 are in contact with each of the upper and lower surfaces of the organic light emitting layer 116, with the organic light emitting layer 116 disposed therebetween.

[0135] The bank 115 may be formed to cover the edge of each pixel electrode 114 of each of the sub-pixels SP and expose a part of each of the pixel electrodes 114. That is, the bank 115 may partially cover the pixel electrode 114. Accordingly, the bank 115 may prevent the pixel electrode 114 and the reflective electrode 117 from contacting each other at the end of each pixel electrode 114. The exposed portion of the pixel electrode 114 not covered by the bank 115 may be included in the light emitting portion (or light emitting area EA). As Figure 3 shown, the light emitting portion may be formed on the plurality of recessed portions 140, and thus the light emitting portion (or light emitting area EA) may partially overlap with the recessed portions 140 in the thickness direction (or third direction (Z-axis direction)) of the substrate 110. In addition, the configurations of the bank 115, the reflective portion 130, and the pattern portion 120 may help prevent current leakage between adjacent sub-pixels.

[0136] After forming the bank 115, the organic light emitting layer 116 may be formed to cover the pixel electrode 114 and the bank 115. Accordingly, the bank 115 may be disposed between the pixel electrode 114 and the organic light emitting layer 116. The bank 115 may be expressed in terms of a pixel defining layer. The bank 115 according to an example may include an organic material and / or an inorganic material. As Figure 3As shown, the bank 115 may be formed to be recessed or inclined along the contour of the pattern portion 120 (or the second layer 1132).

[0137] Referring again to Figure 3 , the organic light-emitting layer 116 may be formed on the pixel electrode 114 and the bank 115. The organic light-emitting layer 116 may be disposed between the pixel electrode 114 and the reflective electrode 117. Thus, when a voltage is applied to each of the pixel electrode 114 and the reflective electrode 117, an electric field is formed between the pixel electrode 114 and the reflective electrode 117. Accordingly, the organic light-emitting layer 116 may emit light. The organic light-emitting layer 116 may be formed of a plurality of sub-pixels SP and a common layer disposed on the bank 115.

[0138] The organic light-emitting layer 116 according to an embodiment may be configured to emit white light. The organic light-emitting layer 116 may include a plurality of stacks that emit different colors of light. For example, the organic light-emitting layer 116 may include a first stack, a second stack, and a charge generation layer (CGL) disposed between the first stack and the second stack. The light-emitting layer may be configured to emit white light, and thus, each of the plurality of sub-pixels SP may include a color filter CF suitable for the corresponding color.

[0139] The first stack may be disposed on the pixel electrode 114, and may implement a structure in which a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML(B)), and an electron transport layer (ETL) are sequentially stacked.

[0140] The charge generation layer may supply charges to the first stack and the second stack. The charge generation layer may 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 may include a metal material as a dopant.

[0141] The second stack may be disposed on the first stack, and may be implemented in a structure in which a hole transport layer (HTL), a yellow-green (YG) emission layer (EML(YG)), and an electron injection layer (EIL) are sequentially stacked.

[0142] In the display device 100 according to an embodiment of the present disclosure, since the organic light-emitting layer 116 is provided as a common layer, the first stack, the charge generation layer, and the second stack may be disposed above all of the plurality of sub-pixels SP. On the other hand, the organic light-emitting layer 116 is not limited to a two-stack series structure, but may be provided as a three-stack or four-stack series structure according to the light-emitting structure.

[0143] The reflective electrode 117 may be formed on the organic light-emitting layer 116. The reflective electrode 117 may be disposed in the light-emitting region EA and the non-light-emitting region NEA. The reflective electrode 117 according to an example may include a metal material. The reflective electrode 117 may 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. Accordingly, the display device 100 according to an embodiment of the present disclosure may be implemented as a bottom-emission type display device.

[0144] The display device 100 according to an embodiment of the present disclosure is of a bottom-emission type and must reflect the light emitted from the organic light-emitting layer 116 toward the substrate 110, and thus the reflective electrode 117 may be made of a metal material having a high reflectivity. The reflective electrode 117 according to an example may be formed of a stacked structure (Ti / Al / Ti) of a metal material having a high reflectivity such as aluminum and titanium, a stacked structure (ITO / Al / ITO) of aluminum and ITO, an Ag alloy, and a stacked structure (ITO / Ag alloy / ITO) of an Ag alloy and ITO. The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). The reflective electrode 117 may be represented by terms such as a second electrode, a cathode electrode, and a counter electrode.

[0145] Meanwhile, in the display device 100 according to an embodiment of the present disclosure, the reflective portion 130 may be a part of the reflective electrode 117, but the embodiment is not limited thereto. For example, according to another embodiment, the reflective portion 130 may be a separate layer and disconnected from the reflective electrode 117. Accordingly, the reflective portion 130 may reflect the light guided toward an adjacent sub-pixel SP toward the light-emitting region EA of the sub-pixel SP for light emission. Since the reflective portion 130 is a part of the reflective electrode 117, as Figure 3 shown, the reflective portion 130 may be denoted by reference numeral 117a. In the present disclosure, the reflective portion 130 may mean the reflective electrode 117 overlapping the pattern portion 120. In particular, the reflective portion 130 may mean the reflective electrode 117 inclined while overlapping the pattern portion 120. Accordingly, as Figure 3 shown, the reflective portion 130 may reflect the light guided toward an adjacent sub-pixel SP or the light dissipated by total internal reflection between interfaces toward the light-emitting region EA (or the non-light-emitting region NEA) of the sub-pixel SP for light emission.

[0146] The encapsulation layer 118 is formed on the reflective electrode 117. The encapsulation layer 118 is used to prevent oxygen or moisture from penetrating into the organic light-emitting layer 116 and the reflective electrode 117. To this end, the encapsulation layer 118 may include at least one inorganic film and at least one organic film. The encapsulation layer 118 may be provided not only in the light-emitting region EA but also in the non-light-emitting region NEA. The encapsulation layer 118 may be provided between the reflective electrode 117 and the opposing substrate 200.

[0147] Referring to Figure 3 , the pattern portion 120 may be formed as a recess (e.g., a depression or a groove) in the first layer 1131 of the coating layer 113. As Figure 3 shown, the pattern portion 120 may be provided near the non-light-emitting region NEA. That is, the pattern portion 120 may be provided to surround the light-emitting region EA while being adjacent to the plurality of recesses 140. When the plurality of recesses 140 are formed in the light-emitting region EA (e.g., during the same etching process or the same mask process, etc.), the pattern portion 120 may be formed together in the non-light-emitting region NEA. The pattern portion 120 may include a bottom surface 120b and an inclined surface 120s.

[0148] The bottom surface 120b of the pattern portion 120 according to one embodiment is formed as the surface closest to the substrate 110, or may be provided to be 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 may be closer to the substrate than the lowermost surface of the pixel electrode 114. Accordingly, the bottom surface 120b of the pattern portion 120 may be provided to have a depth equal to or similar to the depth of each of the plurality of recesses 140. However, when the depth of the pattern portion 120 is less than the depth of the recess 140, the light extraction efficiency may be reduced due to the reduction in the area of the reflective portion 130. Therefore, in the display device 100 according to one embodiment of the present disclosure, the depth of the pattern portion 120 may be set to be equal to the depth of the recess 140 or deeper than the depth of the recess 140 (e.g., the pattern portion 120 may be deeper than the recess 140 or closer to the substrate).

[0149] The inclined surface 120s of the pattern portion 120 may be provided between the bottom surface 120b and the plurality of recesses 140. Accordingly, the inclined surface 120s of the pattern portion 120 may be provided to surround the light-emitting region EA or the plurality of recesses 140. As Figure 3As shown, the inclined surface 120s may be connected to the bottom surface 120b. The inclined surface 120s may form a predetermined angle with the bottom surface 120b. For example, the angle formed by the inclined surface 120s and the bottom surface 120b may be an obtuse angle. Thus, the width of the pattern portion 120 may gradually decrease in the direction from the opposing substrate 200 (or the reflective portion 130) toward the substrate 110 (or the third direction (Z-axis direction)). Since an obtuse angle is formed by the inclined surface 120s and the bottom surface 120b, the second layer 1132, the bank 115, the organic light-emitting layer 116, and the reflective portion 130 formed in subsequent processes may be formed to be recessed along the contour of the pattern portion 120.

[0150] As Figure 3 shown, the pattern portion 120 may be arranged to surround the light-emitting area EA. Since the pattern portion 120 is arranged to surround the light-emitting area EA, at least a part of the reflective portion 130 that is arranged to be inclined on the pattern portion 120 may be arranged to surround the light-emitting area EA. Thus, in the display device 100 according to an embodiment of the present disclosure, since light can even be extracted from the non-light-emitting area NEA near the edge of the light-emitting area EA, the overall light efficiency can be improved. Thus, compared with a general display device that does not have the pattern portion 120 and the reflective portion 130, the display device 100 according to an embodiment of the present disclosure may have the same light-emitting efficiency or more improved light-emitting efficiency even at low power, thereby reducing the overall power consumption.

[0151] In addition, the display device 100 according to an embodiment of the present disclosure may allow the light-emitting element layer E to emit light even at low power, thereby increasing the lifespan of the light-emitting element layer E (or the organic light-emitting layer 116).

[0152] Since the pattern portion 120 is arranged to surround the light-emitting area EA, the pattern portion 120 may be arranged between sub-pixels SP that emit light of different colors. Thus, the reflective portion 130 that is arranged to be inclined on the pattern portion 120 may be arranged between sub-pixels SP that emit light of different colors, so that the reflective portion 130 can prevent light of different colors from being emitted to other adjacent sub-pixels SP. Thus, the display device 100 according to the present disclosure can prevent color mixing (or color distortion) from occurring between sub-pixels SP that emit light of different colors, thereby improving color purity and enhancing image quality.

[0153] Referring Figure 2 to, the pattern portion 120 may include a first pattern line 121 disposed between the circuit area CA and the light-emitting area EA in a first direction (X-axis direction) and a second pattern line 122 disposed in a second direction (Y-axis direction) intersecting the first direction (X-axis direction). Referring Figure 2, the first pattern line 121 may denote the pattern portion 120 disposed in the horizontal direction, and the second pattern line 122 may denote the pattern portion 120 disposed in the vertical direction.

[0154] 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 122a. The bottom surface and the inclined surface of the first pattern line 121 and the bottom surface 122b and the inclined surface 122a of the second pattern line 122 are the same as the bottom surface 120b and the inclined surface 120s of the pattern portion 120 respectively, and thus will not be described herein again. The first pattern line 121 and the second pattern line 122 may be connected together in the non-light-emitting area NEA (or the peripheral area) to surround the light-emitting area EA. The first pattern line 121 may be disposed between sub-pixels SP emitting the same color. The second pattern line 122 may be disposed between sub-pixels SP emitting different colors.

[0155] Since the second pattern line 122 is disposed between sub-pixels SP for emitting lights of different colors, the reflective portion 130 on the second pattern line 122 may prevent lights of different colors from being emitted to other adjacent sub-pixels SP. Therefore, the display device 100 according to the present disclosure may prevent color mixing (or color distortion) between sub-pixels SP for emitting lights of different colors, thereby improving color purity.

[0156] In addition, since the second pattern line 122 extends in the second direction (Y-axis direction) between sub-pixels SP emitting different colors, the second pattern line 122 may not overlap with the data line (e.g., the first data line DL1) in the second direction (Y-axis direction). On the contrary, the first pattern line 121 extends in the first direction (X-axis direction), so the first pattern line 121 may partially overlap with the data line (e.g., the first data line DL1) in the second direction (Y-axis direction).

[0157] The second layer 1132 of the coating layer 113 may further extend from the light-emitting area EA to the non-light-emitting area NEA to partially cover the inclined surface 120s of the pattern portion 120. Thus, as Figure 3As shown, the end portion 1132c of the second layer 1132 may be in contact with the bottom surface 120b of the pattern portion 120. In this case, the end portion 1132c of the second layer 1132 may be in contact with only a part of the bottom surface 120b. When the second layer 1132 completely covers the bottom surface 120b, the depth of the reflection portion 130 formed on the pattern portion 120 may be relatively reduced, thereby reducing the reflection efficiency. Therefore, in the display device 100 according to an embodiment of the present disclosure, the second layer 1132 is arranged to be in contact with only a part of the bottom surface 120b and does not completely cover the bottom surface 120b of the pattern portion 120, and thus the reflection portion 130 formed in a subsequent process can be formed close to the bottom surface 120b, thereby improving the reflection efficiency.

[0158] The bank 115 may extend to cover the inclined surface 1132b of the second layer 1132 while covering the edge of the pixel electrode 114, and the inclined surface 1132b covers the inclined surface 120s of the pattern portion 120. Therefore, the bank 115 may be in contact with the portion of the bottom surface 120b of the pattern portion 120 that is not covered by the second layer 1132. When the bank 115 completely covers the bottom surface 120b, the depth of the reflection portion 130 formed on the pattern portion 120 is reduced, thereby reducing the reflection efficiency. Therefore, as Figure 3 shown, each of the second layer 1132 and the bank 115 on the bottom surface 120b of the pattern portion 120 may be discontinuously arranged. That is, each of the second layer 1132 and the bank 115 may be disconnected on the bottom surface 120b of the pattern portion 120. Therefore, in the display device 100 according to an embodiment of the present disclosure, the bank 115 is arranged to be in contact with only a part of the bottom surface 120b and does not completely cover the bottom surface 120b, so that the reflection portion 130 formed in a subsequent process can be formed close to the bottom surface 120b, thereby improving the reflection efficiency.

[0159] Since the bank 115 is arranged to be in contact with only a part of the bottom surface 120b of the pattern portion 120, the bank 115 may be disconnected from the pattern portion 120, as Figure 3 shown. When the bank 115 is disconnected from the pattern portion 120, the reflection portion 130 provided on the second pattern line 122 may be arranged close to the bottom surface 120b of the pattern portion 120. Therefore, compared with the case where the bank is not disconnected from the pattern portion 120, the reflection portion 130 can be formed as deep as possible in the pattern portion 120, and thus the reflection efficiency can be improved. As Figure 3 shown, since the pattern portion 120 is provided between the sub-pixels SP, the second layer 1132, the bank 115, the organic light-emitting layer 116, and the reflection portion 130 may be arranged symmetrically based on the center of the pattern portion 120 (or the center of the second region A2).

[0160] In the display device 100 according to an embodiment of the present disclosure, a plurality of wirings, such as pixel power lines EVDD, data lines, and reference lines RL, may be arranged so as not to obscure the light-emitting region EA (or not to overlap with the light-emitting region EA). This is because if the plurality of wirings overlap or cover the light-emitting region EA, the light reflected by the reflecting portion 130 may be blocked by the plurality of wirings and may not be able to be emitted toward the substrate 110. Therefore, the display device 100 according to an embodiment of the present disclosure can maximize the light extraction efficiency by arranging the plurality of wirings in the non-light-emitting region NEA so as not to overlap with the light-emitting region EA. In addition, by arranging the display device 100 according to an embodiment of the present disclosure so that the plurality of wirings do not overlap with the light-emitting region EA, the aperture ratio can be increased compared to the case where the plurality of wirings overlap with the light-emitting region EA, and thus the brightness can be improved. In Figure 3 this, the structures of the first data line DL1 and the second data line DL2 in the first sub-pixel SP1 and the second sub-pixel SP2 are described as an example, but the same structure can be applied to the third sub-pixel SP3 and the fourth sub-pixel SP4.

[0161] Meanwhile, when the bank 115 is disconnected from the pattern portion 120, the organic light-emitting layer 116 and the reflecting portion 130 (or the reflecting electrode 117) formed in a subsequent process may be formed along the contour of the bottom surface 120b of the pattern portion 120 and the bank 115.

[0162] According to an example, the reflecting portion 130 may be formed to be recessed along the contour of the pattern portion 120 that is formed to be recessed near the non-light-emitting region NEA on the pattern portion 120, and thus may be formed to be recessed near the non-light-emitting region NEA. According to an example, the reflecting portion 130 may include a flat surface 131 provided at the central portion of the second region A2 and an inclined surface 132 connected to the flat surface 131, as Figure 3 shown. The inclined surface 132 may include a bottom surface 1321 (or a side surface 1321), which reflects the light refracted by the recess 140 and incident thereon. The flat surface 131 may be arranged parallel to the bottom surface 120b of the pattern portion 120. The inclined surface 132 may be inclined along the contour of the inclined surface 120s of the pattern portion 120. Most of the light guided toward the adjacent sub-pixel SP among the light emitted from the emitting sub-pixel SP may be reflected by the inclined surface 132 (or the bottom surface 1321) of the reflecting portion 130 and may be guided into the light-emitting region EA or the non-light-emitting region NEA of the emitting sub-pixel SP.

[0163] In the display device 100 according to an embodiment of the present disclosure, the width W of the edge region EDA in which at least a part of the first recess 141 is disposed overlappingly can be determined by a mathematical formula. For example, the width W of the edge region EDA can be obtained by a mathematical expression related to the vertical distance between the organic light-emitting layer 116 and the substrate 110 and the maximum angle at which the light emitted from the organic light-emitting layer 16 is guided to the outside of the substrate 110 without total reflection from the upper surface 110a of the substrate 110. This will be described with reference to Figure 4 this.

[0164] Figure 4 is Figure 3 an enlarged view of part A of.

[0165] Referring to Figure 4 , the width W of the edge region EDA is given by the following mathematical expression (or Equation 1 below) and can be set to satisfy the following:

[0166] W = T·tanθfinal [Equation 1]

[0167] Here, T can represent the vertical distance between the bottom surface 1161 of the organic light-emitting layer 116 and the top surface 110a of the substrate 110. The vertical distance can be the distance in the direction parallel to the third direction (Z-axis direction), as Figure 4 shown. θ final can represent the maximum angle at which the light emitted from the organic light-emitting layer 116 is guided to the outside of the substrate 110 without total reflection from the upper surface 110a of the substrate 110. In other words, θ final can be the maximum angle at which the light is guided to the outside of the substrate 110 without being trapped by the substrate 110.

[0168] As Figure 4 shown, the first radius R1 of the first recess 141 is greater than the second radius R2 of the second recess 142, so that the first recess 141 can partially overlap with the edge region EDA. For example, as Figure 4 shown, the left part of the first recess 141 can overlap with the first region A1, and the remaining part except the left part of the first recess 141 can overlap with the edge region EDA. In Figure 4 , the first recess 141 partially overlaps with the edge region EDA, but is not limited thereto, and the entire first recess 141 can overlap with the edge region EDA. In the display device 100 according to an embodiment of the present disclosure, the first recess 141 having an aspect ratio smaller than that of the second recess 142 is disposed to overlap with the edge region EDA, so that more light emitted from the organic light-emitting layer 116 and incident on the first recess 141 can reach the reflection part 130 through the left boundary of the first recess 141, thereby improving the light extraction efficiency and / or improving the viewing angle.

[0169] In the case of a general display device in which each of a plurality of recesses is formed in the same shape, the cavity condition in the edge region (or edge portion) is weaker than the cavity condition in the central portion of the light-emitting region, resulting in a decrease in light efficiency. This is because the recesses in the edge portion are formed in the same shape as the recesses in the central portion, so that less light is refracted toward the reflecting portion.

[0170] On the other hand, according to Equation 1 above, when the first recess 141 overlaps with the central region ECA, the light emitted from the organic light-emitting layer 116 is incident on the first recess 141 at an angle greater than θ final such that it is totally reflected from the substrate 110 and cannot be guided to the outside of the substrate 110.

[0171] Therefore, the display device 100 according to an embodiment of the present disclosure is configured such that the first recess 141 having an aspect ratio smaller than that of the second recess 142 overlaps with the edge region EDA to satisfy Equation 1, so that the amount of light refracted to the reflecting portion 130 that is incident on the first recess 141 can be increased, and thus a decrease in light efficiency can be prevented, or rather, the light efficiency can be improved even in the edge region EA of the light-emitting region EA, and the display device can be brighter and provide enhanced image quality.

[0172] In the display device 100 according to an embodiment of the present disclosure, the maximum angle θ final (or emission angle θ final ) is the angle at which the light emitted from the organic light-emitting layer 116 is guided to the outside of the substrate 110 without being totally reflected from the upper surface 110a of the substrate 110. The angle θ substrate (or extinction angle θ substrate ) is the angle at which the light emitted from the organic light-emitting layer 116 is totally reflected from the upper surface 110a of the substrate 110 and is not guided to the outside of the substrate 110, and the maximum angle θ final (or emission angle θ final ) can be set to be smaller than the angle θ substrate (or extinction angle θ substrate ). As described above, when the emission angle θ final is equal to or greater than the extinction angle θ substrate , the light emitted from the organic light-emitting layer 116 is totally reflected from the substrate 110 and may not be guided to the outside. Therefore, the display device 100 according to an embodiment of the present disclosure can be provided with an emission angle θ substrate smaller than the extinction angle θ final , so that the light extraction efficiency can be improved because the light totally reflected from the substrate 110 (or the upper surface 110a of the substrate 110) can be eliminated or reduced.

[0173] On the other hand, the light emitted from the organic light-emitting layer 116 is totally reflected from the upper surface 110a of the substrate 110 and can be prevented from being guided outside the substrate 110 at an angle θ substrate (or extinction angle θ substrate ) is given by the following mathematical expression (or Equation 2) and can be set to satisfy the following.

[0174]

[0175] In Equation 2, n Anode may represent the refractive index of the pixel electrode 114, n oc1 may represent the refractive index of the first layer 1131, and n oc2 may represent the refractive index of the second layer 1132.

[0176] The display device 100 according to an embodiment of the present disclosure may be provided with an emission angle θ substrate less than the extinction angle θ final satisfying Equation 2, so that the light totally reflected from the substrate 110 (or the upper surface 110a of the substrate 110) can be eliminated or reduced, thereby improving the light extraction efficiency.

[0177] Figure 5 is a schematic cross-sectional view showing an exemplary variation of a display device according to an embodiment of the present disclosure. For example, Figure 5 the configuration in Figure 3 is similar to the configuration in

[0178] Now referring to Figure 5 , a variant example of the display device 100 according to an embodiment of the present disclosure is the same as the display device described above according to Figure 3 , except that it is a damless structure without a dam 115. Therefore, the same reference numerals have been assigned to the same configurations, and only the different configurations will be described below.

[0179] In the case of the display device according to Figure 3 , the dam 115 is provided to cover the edge of the pixel electrode 114 while surrounding the entire light-emitting region EA. Therefore, in the case of the display device according to Figure 3 , the light-emitting region EA and the reflection portion 130 are spaced apart by a first distance (D1, shown in Figure 4 ), and a part of the light emitted from the light-emitting region EA can be reflected from the reflection portion 130, or a part of the light emitted from the light-emitting region EA can be refracted by the plurality of recesses 140 (or the first recess 141), and then reflected by the reflection portion 130 and guided to the non-light-emitting region NEA and / or the light-emitting region EA.

[0180] In contrast, in the display device according to Figure 5 , the bank 115 covering the edge of the pixel electrode 114 may not be provided (for example, the bank 115 may be omitted). Therefore, as Figure 5 shows, the reflection part 130 may be spaced apart from the light-emitting region EA by a second distance D2 shorter than the first distance D1. Since the display device according to Figure 5 is configured as a bankless structure without a bank, the reflection part 130 can be positioned as close to the light-emitting region EA as the thickness of the bank (for example, the reflection part 130 may be arranged closer to the edge of the light-emitting region EA). When the distance between the reflection part 130 and the light-emitting region EA is shortened, the light extinguished or damaged by the layer provided between the reflection part 130 and the light-emitting region EA (for example, the organic light-emitting layer 116 or the second layer 1132 in the non-light-emitting region NEA) is reduced, and thus, the light efficiency can be further improved. Therefore, in the display device according to Figure 5 , the reflection part 130 is spaced apart from the light-emitting region EA by a second distance D2 shorter than the first distance D1, and the light efficiency of the light reflected by the reflection part 130 in the light emitted by the organic light-emitting layer 116 can be further improved.

[0181] On the other hand, the display device 100 according to Figure 5 is configured as a bankless structure, so that it can have a structural feature in which the organic light-emitting layer 116 contacts the second layer 1132 (or the inclined surface 1132b of the second layer 1132) in the first region A1 and contacts the first layer 1131 (or the bottom surface 120b of the pattern part 120) in the second region A2, as Figure 5 shows.

[0182] Figure 6A is a schematic cross-sectional view of a display device according to a second embodiment of the present disclosure, and Figure 6B is Figure 6A an enlarged view of part B of

[0183] Referring to Figure 6A and Figure 6B , the display device 100 according to the second embodiment of the present disclosure is the same as the above-described display device according to Figure 3 , except that the structure of the first recess 141 provided in the edge region EDA has been changed (for example, a larger second recess 142 is located at the center of the sub-pixel, and a smaller first recess 141 is located around the edge of the sub-pixel). Therefore, the same reference numerals have been assigned to the same configurations, and only the different configurations will be described below.

[0184] In the above according to Figure 3In the case of the display device, the first radius R1 of the first recess 141 is greater than the second radius R2 of the second recess 142, and the first vertical length H1 of the first recess 141 is equal to the second vertical length H2 of the second recess 142. Therefore, in accordance with Figure 3 In the case of the display device, one first recess 141 (or a part of the first recess 141) may be provided in the edge region EDA. Therefore, in accordance with Figure 3 The display device may be arranged such that the cross-sectional length CL1 of the left boundary of the first recess 141 is longer than the cross-sectional length CL2 of the left boundary of the second recess 142, so that the amount of light refracted to the reflecting portion 130 can be increased, thereby improving the light extraction efficiency.

[0185] Conversely, in the case of the display device in accordance with Figure 6A the first radius R1 of the first recess 141 is less than the second radius R2 of the second recess 142, and the first vertical length H1 of the first recess 141 is less than the second vertical length H2 of the second recess 142. Therefore, in accordance with Figure 6A In the case of the display device, at least one (or more) of the first recesses 141 may be provided in the edge region EDA. For example, as Figure 6A shown, the edge region EDA may completely overlap with one first recess 141 and may partially overlap with another first recess 141. Therefore, in accordance with Figure 6A In the case of the display device, since the amount of light refracted to the reflecting portion 130 can be increased due to the overlap of the plurality of first recesses 141 with the edge region EDA (for example, a larger number of recesses can be densely packed into the edge region EDA), the light extraction efficiency can be improved.

[0186] Therefore, as Figure 6A shown, the display device 100 according to the second embodiment of the present disclosure has at least one or more first recesses 141 overlapping with the edge region EDA and at least one or more second recesses 142 overlapping with the central region ECA, and the amount of light refracted to the reflecting portion 130 via the plurality of first recesses 141 can be increased (for example, due to the presence of a higher number of recesses in the edge region EDA), thereby improving the light extraction efficiency of the reflected light, and the light extraction efficiency of the direct light passing through the second recesses 142 can be improved. Since the reflected light is the light reflected by the reflecting portion 130 and guided to the outside of the substrate 110, improving the light extraction efficiency of the reflected light can mean improving the viewing angle. And, since improving the light extraction efficiency of the direct light can be referred to as an increase in the amount of light guided forward rather than laterally, improving the front light extraction efficiency can mean including improving the front light extraction efficiency. In addition, the depth of the first recess 141 may be less than the depth of the second recess 142.

[0187] On the other hand, in the case of the display device according to Figure 3 only the radii of the first recess 141 and the second recess 142 are different from each other, but the vertical lengths are the same, such that the first recess 141 and the second recess 142 can be easily formed by changing only the size of the opening of one mask without an additional mask.

[0188] In contrast, in the case of the display device according to Figure 6A the first vertical length H1 of the first recess 141 is smaller than the second vertical length H2 of the second recess 142, such that 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 Figure 6A the first vertical length H1 of the first recess 141 is set to be smaller than the second vertical length H2 of the second recess 142, such that the refraction area of the light refracted by the first recess 141 and reaching the reflection part 130 can be larger than the refraction area of the light refracted by the second recess 142 and reaching the reflection part 130. In other words, the second recess 142 can be wider and deeper than the first recess 141. Therefore, in the case of the display device according to Figure 6A due to the plurality of first recesses 141 provided in the edge area EDA, the light path reaching the reflection part 130 can be optimized, which can increase the amount of light reaching the reflection part 130, thereby improving the light extraction efficiency.

[0189] On the other hand, in the display device 100 according to Figure 6A the bank 115 covers the edge of the pixel electrode 114, such that the reflection part 130 can be spaced apart from the light emitting area EA by a first distance D1'.

[0190] Figure 7A is a schematic cross-sectional view showing a variant example of the display device according to the second embodiment of the present disclosure, and Figure 7B is Figure 7A an enlarged view of part C of

[0191] Referring to Figure 7A and Figure 7B a variant example of the display device 100 according to the second embodiment of the present disclosure is the same as the above display device according to Figure 6A except that it is 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.

[0192] In the case of the above display device according to Figure 6A the bank 115 is provided to cover the edge of the pixel electrode 114 while surrounding the entire light emitting area EA. Therefore, in the case of the display device according to Figure 6AIn the case of the display device, the light-emitting region EA and the reflecting portion 130 are spaced apart by a first distance (D1’, shown in Figure 6A ). A part of the light emitted from the light-emitting region EA can be reflected from the reflecting portion 130, or a part of the light emitted from the light-emitting region EA can be refracted by the plurality of recesses 140 (or the first recess 141), and then reflected from the reflecting portion 130 and guided to the non-light-emitting region NEA and / or the light-emitting region EA.

[0193] On the contrary, in the display device according to Figure 7A , the bank 115 covering the edge of the pixel electrode 114 may not be provided (for example, the bank 115 may be omitted). Therefore, as shown in Figure 7A , the reflecting portion 130 may be spaced apart from the light-emitting region EA by a second distance D2’ shorter than the first distance D1’. Since the display device according to Figure 7A is provided with a non-bank structure without a bank, the reflecting portion 130 can be positioned as close to the light-emitting region EA as the thickness of the bank. When the distance between the reflecting portion 130 and the light-emitting region EA is shortened, the light extinguished or diffused by the layer provided between the reflecting portion 130 and the light-emitting region EA (for example, the organic light-emitting layer 116 or the second layer 1132 in the non-light-emitting region NEA) is reduced, and thus, the light efficiency can be further improved. Therefore, in the display device according to Figure 7A , the reflecting portion 130 is spaced apart from the light-emitting region EA by a second distance D2’ shorter than the first distance D1’, and the light efficiency of the light reflected from the reflecting portion 130 in the light emitted by the organic light-emitting layer 116 can be further improved.

[0194] On the other hand, the display device 100 according to Figure 7A is provided with a non-bank structure, so that it can have a structural feature in which the organic light-emitting layer 116 contacts the second layer 1132 (or the inclined surface 1132b of the second layer 1132) in the first region A1 and contacts the first layer 1131 (or the bottom surface 120b of the pattern portion 120) in the second region A2, as shown in Figure 7A .

[0195] Figure 8A is a schematic cross-sectional view of a display device according to a third embodiment of the present disclosure, and Figure 8B is Figure 8A an enlarged view of part D of

[0196] Referring to Figure 8A and Figure 8B , the display device 100 according to the third embodiment of the present disclosure is the same as the above-mentioned one according to Figure 3The display device is the same, except that the structure of the first recess 141 provided in the edge region EDA has been changed. Therefore, the same reference numerals have been assigned to the same configurations, and only the different configurations will be described below.

[0197] In the case of the display device according to Figure 3 above, the first radius R1 of the first recess 141 is greater than the second radius R2 of the second recess 142, and the first vertical length H1 of the first recess 141 is equal to the second vertical length H2 of the second recess 142. Therefore, in the case of the display device according to Figure 3 above, one first recess 141 (or a part of the first recess 141) can be provided in the edge region EDA. Therefore, the display device according to Figure 3 above can be configured such that the cross-sectional length CL1 of the left boundary of the first recess 141 is longer than the cross-sectional length CL2 of the left boundary of the second recess 142, so that the amount of light refracted to the reflecting portion 130 can be increased, thereby improving the light extraction efficiency.

[0198] In contrast, in the case of the display device according to Figure 8A above, the first radius R1 of the first recess 141 is equal to or substantially equal to the second radius R2 of the second recess 142, and the first vertical length H1 of the first recess 141 is less than the second vertical length H2 of the second recess 142. Therefore, in the case of the display device according to Figure 8A above, one first recess 141 having a depth shallower than that of the second recess 142 can be provided in the edge region EDA. For example, as shown in Figure 8A , one first recess 141 having a depth shallower than that of the second recess 142 may partially overlap with the edge region EDA. However, it is not limited thereto, and one first recess 141 having a depth shallower than that of the second recess 142 may completely overlap with the edge region EDA. Therefore, in the case of the display device according to Figure 8A above, since the amount of light refracted to the reflecting portion 130 can be increased due to the overlap of the first recess 141 with the edge region EDA, the light extraction efficiency can be improved.

[0199] Therefore, as shown in Figure 8A , in the display device 100 according to the third embodiment of the present disclosure, the first recess 141 having a depth shallower than that of the second recess 142 may partially overlap with the edge region EDA, so that the refraction area of the light refracted by the first recess 141 and reaching the reflecting portion 130 can be increased, thereby increasing the amount of light refracted to the reflecting portion 130, thereby improving the light extraction efficiency of the reflected light (and / or improving the viewing angle). In addition, by providing a plurality of second recesses 142 having the same radius as the first recess 141 in the central region ECA, the light extraction efficiency of the direct light (and / or the front light extraction efficiency) can be maximized.

[0200] On the other hand, in the case of the display device according to Figure 8A , the first vertical length H1 of the first recess 141 is less than the second vertical length H2 of the second recess 142, such that the second recess 142 and the first recess 141 can be formed by different etching processes (or ashing processes). In addition, in the display device 100 according to Figure 8A , the bank 115 covers the edge of the pixel electrode 114, such that the reflective portion 130 can be spaced apart from the light-emitting region EA by a first distance D1".

[0201] Figure 9A is a schematic cross-sectional view showing a variant example of a display device according to a third embodiment of the present disclosure, and Figure 9B is Figure 9A an enlarged view of part F of Figure 9A . Here, the configuration in Figure 8A is similar to the configuration in

[0202] , but the bank is removed to provide a bankless configuration. Figure 9A and Figure 9B , a variant example of the display device 100 according to the third embodiment of the present disclosure is the same as the display device according to Figure 8A described above, except that it is a bankless structure without the bank 115. Accordingly, the same reference numerals are assigned to the same configurations, and only the different configurations will be described hereinafter.

[0203] In the case of the display device according to Figure 8A , the provided bank 115 is arranged to cover the edge of the pixel electrode 114 while surrounding the entire light-emitting region EA. Accordingly, in the case of the display device according to Figure 8A , the light-emitting region EA and the reflective portion 130 are spaced apart by a first distance (D1", shown in Figure 8A ), and a part of the light emitted from the light-emitting region EA can be reflected by the reflective portion 130, or a part of the light emitted from the light-emitting region EA can be refracted by the plurality of recesses 140 (or the first recess 141) and then reflected by the reflective portion 130 and guided to the non-light-emitting region NEA and / or the light-emitting region EA.

[0204] In contrast, in the display device according to Figure 9A , the bank 115 covering the edge of the pixel electrode 114 may not be provided. Accordingly, as shown in Figure 9A , the reflective portion 130 can be spaced apart from the light-emitting region EA by a second distance D2" shorter than the first distance D1". Since according to Figure 9AThe display device is configured to have a non-dam structure without dams, so that the reflective portion 130 can be positioned as close to the light-emitting region EA as the thickness of the dam. When the distance between the reflective portion 130 and the light-emitting region EA is shortened, the light extinguished by the layer (e.g., the organic light-emitting layer 116 or the second layer 1132 in the non-light-emitting region NEA) disposed between the reflective portion 130 and the light-emitting region EA is reduced, and thus, the light efficiency can be further improved. Therefore, in the display device according to Figure 9A the second distance D2” shorter than the first distance D1” is spaced between the reflective portion 130 and the light-emitting region EA, so that the light efficiency of the light reflected by the reflective portion 130 emitted from the organic light-emitting layer 116 can be further improved.

[0205] On the other hand, according to Figure 9A the display device 100 is configured to have a non-dam structure, so that it can have a structural feature in which the organic light-emitting layer 116 contacts the second layer 1132 (or the inclined surface 1132b of the second layer 1132) in the first region A1 and contacts the first layer 1131 (or the bottom surface 120b of the pattern portion 120) in the second region A2, as Figure 9A shown.

[0206] In the display panel of the present disclosure, the display panel may include: a first sub-pixel and a second sub-pixel disposed on a substrate, the first sub-pixel being adjacent to the second sub-pixel, the first sub-pixel having a first light-emitting region, and the second sub-pixel 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, the plurality of recesses including a first recess and a second recess having a different shape from the first recess; a pattern portion disposed between the first sub-pixel and the second sub-pixel; and a reflective portion overlapping the pattern portion, thereby improving the extraction efficiency of the light emitted from the light-emitting layer.

[0207] In addition, in the display device of the present disclosure, the display device may include: a display panel including a plurality of sub-pixels; a gate driver configured to supply a gate signal to a gate line connected to the plurality of sub-pixels; and a data driver configured to supply a data signal to a data line connected to the plurality of sub-pixels, wherein the display panel includes: a first sub-pixel and a second sub-pixel disposed on a substrate, the first sub-pixel and the second sub-pixel being adjacent to each other, the first sub-pixel having a first light-emitting region, and the second sub-pixel 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, the plurality of recesses including a first recess and a second recess having a different shape from the first recess; a pattern portion disposed between the first sub-pixel and the second sub-pixel; and a reflective portion overlapping the pattern portion. Accordingly, the amount of light reaching the reflective portion can be increased compared to the case where the first recess and the second recess have the same size, thereby improving the viewing angle.

[0208] In addition, in the display device of the present disclosure, the reflective portion is configured to redirect the light emitted from the first sub-pixel that has passed through one of the plurality of recesses in a direction toward the substrate, thereby maximizing the light extraction efficiency by light extraction in a non-light-emitting region.

[0209] In addition, the display device according to the present disclosure can even extract light in a non-light-emitting region, and compared to a display device without a reflective portion, it can have the same luminous efficiency or even better luminous efficiency at a lower power, thereby resulting in a lower overall power consumption.

[0210] The effects to be obtained from the present disclosure are not limited to those mentioned above, and other effects not mentioned will become apparent to those of ordinary skill in the art from the description. The embodiments of the present disclosure have been described in more detail with reference to the drawings, but the present disclosure is not necessarily limited to these embodiments, and can be practiced with various modifications without departing from the technical idea of the present disclosure. Therefore, the embodiments disclosed herein are intended to illustrate rather than limit the technical idea of the present disclosure, and the scope of the technical idea of the present disclosure is not limited by these embodiments. Therefore, the above embodiments are examples in all respects and should be understood as non-limiting. All technical ideas within the scope of the present specification should be construed as being included within the scope of the claims of the present specification.

Claims

1. A display panel, comprising: A first sub-pixel and a second sub-pixel are disposed on the substrate, the first sub-pixel is adjacent to the second sub-pixel, the first sub-pixel has a first light-emitting area, and the second sub-pixel has a second light-emitting area; A pixel electrode disposed in the first sub-pixel; An insulating layer disposed between the pixel electrode and the substrate, the insulating layer comprising a plurality of concave portions, the plurality of concave portions comprising a first concave portion and a second concave portion having a shape different from that of the first concave portion; a pattern portion disposed between the first sub-pixel and the second sub-pixel; and A reflecting portion 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, having passed through one of the plurality of recessed portions, in a direction toward the substrate.

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

4. The display panel according to claim 3, wherein: The groove surrounds at least a majority of an outer periphery of the pixel electrode in the first sub-pixel in a plan view, and Wherein, the groove is spaced apart from the pixel electrode.

5. The display panel according to claim 3, wherein: A cross section of the groove 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 reflection portion is a portion of the reflection electrode of the first sub-pixel extending continuously across the pattern portion.

7. The display panel according to claim 1, wherein: The first concave portion overlaps with an edge region of the pixel electrode, and the second concave portion overlaps with a central region of the pixel electrode.

8. The display panel according to claim 7, wherein: The first recess at 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 at 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 comprising: A bank is disposed on an edge of the pixel electrode and overlaps the inclined surface of the pattern part.

12. The display panel according to claim 1, further comprising: A light emitting layer is disposed in the first sub-pixel, the light emitting layer directly contacting the inclined surface of the pattern part.

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

14. The display panel according to claim 1, wherein: The first concave portion is one of a plurality of first concave portions in the first sub-pixel, and the second concave portion is one of a plurality of second concave portions in the first sub-pixel, and 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 device, comprising: A display panel including a plurality of sub-pixels; a gate driver configured to supply a gate signal to gate lines connected to the plurality of sub-pixels; as well as a data driver configured to supply data signals to data lines connected to the plurality of sub-pixels, Wherein, the display panel comprises: A first sub-pixel and a second sub-pixel are disposed on a substrate, the first sub-pixel is adjacent to the second sub-pixel, the first sub-pixel has a first light emitting area, and the second sub-pixel has a second light emitting area, a pixel electrode disposed in the first sub-pixel, An insulating layer is provided between the pixel electrode and the substrate, the insulating layer comprising a plurality of recesses, the plurality of recesses comprising 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 reflecting portion overlaps the pattern portion.

16. The display device according to claim 15, further comprising: The first data line of the first sub-pixel is electrically connected to the first sub-pixel via the connection portion of the pixel electrode. wherein the pattern portion surrounds at least a majority of an outer periphery of the pixel electrode in the first sub-pixel in a plan view, Wherein, the pattern portion is spaced apart from the pixel electrode. wherein the connection portion of the pixel electrode passes between adjacent portions of the pattern portion in the plan view without covering the pattern portion, and Wherein, a portion of the first data line crosses the pattern portion in the plan view without covering most of the pattern portion.

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

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

19. The display device according to claim 18, wherein: The groove surrounds at least a majority of an outer periphery of the pixel electrode in the first sub-pixel in a plan view, and Wherein, the groove is spaced apart from the pixel electrode.

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

21. The display device according to claim 15, wherein: The reflection portion is a portion of the reflection electrode of the first sub-pixel extending continuously across the pattern portion.

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

23. The display device according to claim 22, wherein: The first recess at the edge region is wider than the second recess.

24. The display device according to claim 22, wherein: The second recess is wider than the first recess at the edge region.

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

26. The display device according to claim 15, further comprising: A bank is disposed on an edge of the pixel electrode and overlaps the inclined surface of the pattern part.

27. The display device according to claim 15, further comprising: A light emitting layer is disposed in the first sub-pixel, the light emitting layer directly contacting the inclined surface of the pattern part.

28. The display device according to claim 15, wherein: The insulating layer includes a first layer having a first refractive index and a second layer having a second refractive index higher than the first refractive index, and Wherein, the second layer is arranged between the pixel electrode and the first layer.

29. The display device according to claim 15, wherein: The first concave portion is one of a plurality of first concave portions in the first sub-pixel, and the second concave portion is one of a plurality of second concave portions in the first sub-pixel, and Wherein, a first aspect ratio of the plurality of first recesses is different from a second aspect ratio of the plurality of second recesses.

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

31. A display device comprising: The display panel according to any one of claims 1 to 14; a gate driver configured to supply a gate signal to a gate line connected to the first sub-pixel and the second sub-pixel; as well as A data driver configured to supply a data signal to a data line connected to the first sub-pixel and the second sub-pixel.

32. The display device according to claim 31, further comprising: a power line connected to the first sub-pixel, wherein the pattern portion surrounds at least a majority of an outer periphery of the pixel electrode in the first sub-pixel in a plan view, Wherein, the pattern portion is spaced apart from the pixel electrode. wherein a portion of the electric force lines intersects the pattern portion in the plan view without covering a majority of the pattern portion, and A portion of the first data line connected to the first sub-pixel crosses the pattern portion in the plan view without covering a majority of the pattern portion.

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