Display device

Abstract

Disclosed is a display device including: a plurality of sub-pixels configured to include a light emitting area; a planarization layer configured to include a plurality of light extraction patterns having a plurality of recessed portions and a plurality of protruding portions in each sub-pixel; a light emitting device layer at the planarization layer of each sub-pixel; and a bank layer disposed between the planarization layer and the light emitting device layer to expose the light emitting area in each of the plurality of sub-pixels, and an end portion of the bank layer is disposed at a recessed portion of an outermost light extraction pattern of at least one sub-pixel.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2020-0146531, filed on November 5, 2020, which is incorporated herein by reference as if fully set forth herein. Technical Field

[0003] This disclosure relates to display devices, and more particularly to display devices capable of improving light extraction efficiency. Background Technology

[0004] With the advancement of the information society, the attention and demand for display devices configured to display information have increased in various forms. The display field has developed rapidly, resulting in the research and development of various thin and light flat panel display devices. Recently, various display devices utilizing technologies such as liquid crystal displays and organic light-emitting diode displays have been developed.

[0005] Organic light-emitting diode (OLED) displays are self-emitting display devices that display images on a display panel by emitting light through an organic light-emitting layer inserted between two electrodes. Therefore, unlike liquid crystal displays (LCDs), OLEDs do not require an additional light source, allowing them to be manufactured in a lightweight and thin manner. Furthermore, OLEDs are advantageous in terms of power consumption due to their low-voltage operation and offer excellent performance in color reproduction, response speed, viewing angle, and contrast. Consequently, OLEDs are being researched as a next-generation display technology.

[0006] Organic light-emitting display devices display images while emitting internal light to the outside of the display device. Therefore, research has been conducted to improve the efficiency of internal light. Summary of the Invention

[0007] In organic light-emitting display devices, light emitted from the organic light-emitting layer passes through various components of the device and is emitted to the outside. However, light emitted from the organic light-emitting layer may not be emitted to the outside, and some light may be trapped inside the device, making the light extraction efficiency of the organic light-emitting display device problematic.

[0008] Therefore, this disclosure was made in view of the above problems, and the purpose of this disclosure is to provide a display device that can improve light extraction efficiency without additional processes or structures.

[0009] To achieve these and other aspects of the inventive concept, as implemented and broadly described herein, a display device includes: a plurality of sub-pixels configured to include a light-emitting region; a planarization layer configured to include a plurality of light-extracting patterns having a plurality of recessed portions and a plurality of protruding portions in each of the plurality of sub-pixels; a light-emitting device layer disposed at the planarization layer of each of the plurality of sub-pixels; and a dam layer disposed between the planarization layer and the light-emitting device layer to expose the light-emitting region in each of the plurality of sub-pixels, the ends of the dam layer being configured to be disposed at a recessed portion of the outermost light-extracting pattern of at least one of the plurality of sub-pixels.

[0010] In another aspect, the display device includes: a plurality of sub-pixels, each including a light-emitting region; a planarization layer configured to include a plurality of light-extracting patterns having a plurality of recessed portions and a plurality of protruding portions in each of the plurality of sub-pixels; a light-emitting device layer disposed at the planarization layer of each of the plurality of sub-pixels; and a dam layer configured to define a light-emitting region in each of the plurality of sub-pixels, the ends of the dam layer being configured to be disposed at a recessed portion of the outermost light-extracting pattern of at least one of the plurality of sub-pixels.

[0011] According to an embodiment of this disclosure, the end of the embankment is configured to overlap with all the recessed portions of all the outermost light extraction patterns among a plurality of light extraction patterns.

[0012] According to embodiments of this disclosure, a plurality of sub-pixels are configured to include red sub-pixels, white sub-pixels, blue sub-pixels, and green sub-pixels, and the end of the dam layer in each of the red, white, blue, and green sub-pixels is configured to be located at a recessed portion of the outermost light extraction pattern.

[0013] According to embodiments of this disclosure, the ends of the dam layer in each of the red, blue, and green sub-pixels are configured to be alternately disposed at the recessed and protruding portions of the outermost light extraction pattern, and the ends of the dam layer in the blue sub-pixel are configured to be disposed at the recessed portion of the outermost light extraction pattern.

[0014] According to embodiments of this disclosure, the end of the dam layer in each of the red, blue, and green sub-pixels is configured to be located at a recessed portion of the outermost light extraction pattern, and the end of the dam layer in the white sub-pixel is configured to be located at a protruding portion of the outermost light extraction pattern. The end of the dam layer in the white sub-pixel is configured to be located between the outermost light extraction pattern and the light extraction pattern adjacent to the outermost light extraction pattern.

[0015] According to embodiments of this disclosure, the display device has the advantage of improving the brightness and color temperature of the displayed image.

[0016] According to an embodiment of the present disclosure, the end of the embankment is positioned at the recessed portion of the outermost light extraction pattern, and thus the light-emitting area can be widened to increase the aperture ratio, thereby improving brightness.

[0017] According to an embodiment of the present disclosure, the end of the dam layer is positioned at the recessed portion of the outermost light extraction pattern, and the inclined surface of the light extraction pattern is exposed. As a result, light emitted from the light-emitting device layer can be reflected by the second electrode located at the inclined surface, without being captured by the protruding portion of the dam layer or the light extraction pattern, and can be extracted forward, thereby improving the light extraction efficiency.

[0018] According to embodiments of the present disclosure, the end of the dam layer in the white sub-pixel is disposed at the protruding portion of all the outermost light extraction patterns, or disposed between the recessed portion of each outermost light extraction pattern and the recessed portion of the light extraction pattern preceding the outermost light extraction pattern, thereby reducing the reflective visibility of the display device by reducing the diffuse component of light.

[0019] Furthermore, according to embodiments of this disclosure, the light extraction efficiency can be adjusted for each sub-pixel with different color temperatures, and the light extraction efficiency can be improved without additional processes or structures. Attached Figure Description

[0020] The above and other objects, features and advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings.

[0021] Figure 1 A display device according to an embodiment of the present disclosure is shown;

[0022] Figure 2 The planar structure of a pixel according to an embodiment of the disclosed content is shown;

[0023] Figure 3 It is shown Figure 2 A cross-sectional view of the sub-pixel's cross-sectional structure;

[0024] Figure 4 It is shown Figure 2 An enlarged plan view of 'A';

[0025] Figure 5A It is along Figure 4 A cross-sectional view of I-I';

[0026] Figure 5B It is along Figure 4Sectional view of II-II';

[0027] Figure 5C It is configured to interpret Figure 5A and 5B The graph shows the light extraction efficiency;

[0028] Figure 6A and Figure 6B Other embodiments according to this disclosure are shown. Figure 4 The 'A' part;

[0029] Figure 7 The planar structure of a pixel according to a second embodiment of the present disclosure is shown;

[0030] Figure 8 It is shown Figure 7 A magnified view of the 'C';

[0031] Figure 9A It is along Figure 8 Sectional view of III-III';

[0032] Figure 9B It is along Figure 8 A cross-sectional view of IV-IV';

[0033] Figure 10 It is shown Figure 7 A magnified view of the 'B';

[0034] Figure 11A It is along Figure 10 A cross-sectional view of V-V';

[0035] Figure 11B It is along Figure 10 A cross-sectional view of VI-VI';

[0036] Figure 12 The planar structure of pixels according to a third embodiment of the present disclosure is shown;

[0037] Figure 13 It is shown Figure 12 An enlarged view of the 'W';

[0038] Figure 14A It is along Figure 13 Cross-sectional views of VII-VII'; and

[0039] Figure 14B It is along Figure 13 Cross-sectional view of VIII-VIII'. Detailed Implementation

[0040] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The embodiments described below are provided as examples so that the spirit of the invention can be fully conveyed to those skilled in the art. Therefore, the present disclosure is not limited to the embodiments described below and may be implemented in other forms. Furthermore, in the drawings, the dimensions and thickness of the device may be enlarged for convenience. The same reference numerals always denote the same elements. In addition, in the following description, detailed descriptions of related known art will be omitted where it is determined that such detailed descriptions would unnecessarily obscure important points of the present disclosure.

[0041] When using the terms 'includes,' 'has,' and 'includes' as described in this specification, additional parts may be added unless 'only' is used. Singular terms may include plural forms unless otherwise indicated.

[0042] When describing positional relationships, for example, when the positional relationship between two components is described as 'on top of,' 'above,' 'below,' and 'near,' one or more other components may be positioned between the two components unless more restrictive terms such as 'only' or 'directly' are used.

[0043] Spatial relative terms, such as "below," "under," "lower part," "above," "upper part," etc., can be used to readily describe the relationship between one or more elements and another element as shown in the accompanying drawings. Spatial relative terms can be understood to include terms describing different orientations of the device in use or operation, in addition to those shown in the drawings. For example, when the device in the drawings is flipped, an element described as "below other elements" or "below other elements" can be placed "above other elements." Therefore, the exemplary terms "below" or "under" can include both downward and upward directions.

[0044] In describing elements of this disclosure, the terms “first,” “second,” “A,” “B,” “(a),” “(b),” etc., may be used. These terms are intended to distinguish the corresponding element from other elements, and the basis, order, sequence, or number of the corresponding elements shall not be limited by these terms.

[0045] Features of various embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may interoperate and be technically driven with each other in various ways, as will be fully understood by those skilled in the art. Embodiments of this disclosure may be performed independently of each other or may be performed together in an interdependent relationship.

[0046] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0047] Figure 1 A display device according to an embodiment of the present disclosure is shown.

[0048] Reference Figure 1 The display device (or light-emitting display device) according to the embodiments of the present disclosure may include a display panel 10 and an external driving circuit portion of the panel. The display panel 10 may include a substrate 100 and a opposing substrate 300 bonded to each other.

[0049] The substrate 100 may include thin-film transistors. The substrate 100 may be a transparent glass substrate or a transparent plastic substrate. The substrate 100 may include a display area (AA) and a non-display area (IA).

[0050] The display area AA can be an area used to display images. The display area AA can be a pixel array area, an active area, a portion of a pixel array, a display portion, or a screen. For example, the display area AA can be located in the central area of ​​the display panel 10. The display area AA can include multiple pixels P. The multiple pixels P can be defined as a unit area for actually emitting light.

[0051] The non-display area (IA) can be an area where no image is displayed. The non-display area (IA) can be a peripheral circuit area, a signal supply area, an active area, or a border area. The non-display area (IA) can be configured to surround the display area AA. The display panel 10 or the substrate 100 may also include a peripheral circuit portion 50 disposed at the non-display area (IA). The substrate 300 may correspond to the sealing substrate 100.

[0052] The opposing substrate 300 can be bonded to the substrate 100 using an adhesive component (or a transparent adhesive). The opposing substrate 300 can be an upper substrate, a second substrate, or a packaging substrate.

[0053] Furthermore, the substrate 100 according to embodiments of this disclosure may also include an optical film disposed on a second surface opposite to the first surface. The second surface of the first substrate 100 may be the rear surface of the substrate 100 or the light extraction surface of the substrate 100. For example, the optical film may also include a polarizing film attached to the second surface of the substrate 100.

[0054] Figure 2 A planar structure of a pixel is shown according to an embodiment of the present disclosure. Figure 3 It is shown Figure 2 A cross-sectional view of the sub-pixel cross-sectional structure. Figure 4 It is shown Figure 2 An enlarged plan view of 'A'.

[0055] Reference Figures 2 to 4The display device according to the embodiments of the present disclosure may include a plurality of pixels P, wherein a unit pixel P may be configured to include a plurality of sub-pixels SP.

[0056] Multiple subpixels SP may include red subpixels R, white subpixels W, blue subpixels B, and green subpixels G. Multiple subpixels SP may be classified (or divided) into red subpixels R, white subpixels W, blue subpixels B, and green subpixels G. A subpixel SP may include a pixel region PA and a circuit region CA. Pixel region PA may include a light-emitting region EA. Circuit region CA may be spatially separated from the light-emitting region EA within the subpixel SP. The light-emitting region EA is a region defined by a dam (or dam layer) in the subpixel SP, for example, a region where the dam (or dam layer) is open. The light-emitting region EA may be defined as the portion other than the circuit region CA. For example, the circuit region CA may be a non-light-emitting region or a non-open region.

[0057] A pixel P may include four sub-pixels SP. A pixel P may include a red sub-pixel R, a white sub-pixel W, a blue sub-pixel B, and a green sub-pixel G. Between the light-emitting region EA and the circuit region CA in the sub-pixel SP, there exists a lateral gate line GL that is configured to extend. Between each sub-pixel SP, multiple data lines DL or reference lines RL may be set and configured to pass through the region between the corresponding light-emitting region EA and an adjacent light-emitting region EA, or the region between the corresponding circuit region CA and an adjacent circuit region CA. In a group of pixels P, there exists a power line VDD parallel to the data lines DL. For the sensing drive mode of pixel P, the reference line RL can be used as a sensing line, which is configured to sense changes in the characteristics of the thin-film transistor Tdr and / or the characteristics of the light-emitting device layer from the outside.

[0058] The display device may include a buffer layer 110, a pixel circuit portion, a protective layer 130, a planarization layer 170, and a light-emitting portion EP on a substrate 100.

[0059] The buffer layer 110 may be disposed over the entire area of ​​the first surface (or front surface) 100a of the substrate 100. The buffer layer 110 may prevent materials contained in the substrate 100 from diffusing into the transistor layer of the high-temperature steps of the process for manufacturing thin-film transistors, or may prevent external water or moisture from penetrating into the light-emitting device. Optionally, according to some embodiments of this disclosure, the buffer layer 110 may be omitted.

[0060] The pixel circuit section may include a driving thin-film transistor Tdr disposed at the circuit region CA. The driving thin-film transistor Tdr may include an active layer 111, a gate insulating film 113, a gate 115, an insulating intermediate layer 117, a drain 119d, and a source 119s.

[0061] The active layer 111 included in the driving thin-film transistor Tdr can be configured as a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxide and organic materials.

[0062] The gate insulating film 113 may be disposed on the channel region 111c of the active layer 111. As an example, the gate insulating film 113 may be disposed in an island shape only on the channel region 111c of the active layer 111, or it may be disposed on the entire surface of the substrate 100 or the buffer layer 110 including the active layer 111.

[0063] An insulating intermediate layer 117 may be disposed on the gate 115 and the drain region 111d and source region 111s of the active layer 111. The insulating intermediate layer 117 may be disposed over the entire area of ​​the light-emitting region EA and the circuit region CA. For example, the insulating intermediate layer 117 may be configured as an inorganic material or an organic material.

[0064] The pixel circuit section may further include a capacitor, and a first switching thin-film transistor and a second switching thin-film transistor disposed together with the driving thin-film transistor Tdr at the circuit region CA. The display device may further include a light-shielding layer 101 disposed below the active layer 111 of at least one of the driving thin-film transistor Tdr, the first switching thin-film transistor, and the second switching thin-film transistor.

[0065] A protective layer 130 may be disposed on the substrate 100 to cover (or cover) the pixel circuit portion. The protective layer 130 covers (or covers) the drain 119d of the driving thin-film transistor Tdr, the source 119s of the driving thin-film transistor Tdr, and the insulating intermediate layer 117. The protective layer 130 may be disposed over the entire area of ​​the pixel region CA and the light-emitting region EA. For example, the protective layer 130 may be represented as a passivation layer.

[0066] The display device according to embodiments of the present disclosure may further include a wavelength conversion layer 150 on the substrate 100.

[0067] A wavelength conversion layer 150 may be disposed between the substrate 100 and the planarization layer 170 to overlap with at least one light-emitting region EA. According to an embodiment of the present disclosure, the wavelength conversion layer 150 may be disposed between the protective layer 130 and the planarization layer 170 to overlap with the light-emitting region EA. According to another embodiment of the present disclosure, the wavelength conversion layer 150 may be disposed between the insulating intermediate layer 117 and the protective layer 130, or between the substrate 100 and the insulating intermediate layer 117, to overlap with the light-emitting region EA.

[0068] The wavelength conversion layer 150 can have a size relatively larger than the light-emitting region EA. For example, the wavelength conversion layer 150 can be relatively larger than the light-emitting region EA, thereby the wavelength conversion layer 150 can be relatively larger than the light extraction pattern 180 of the planarization layer 170.

[0069] The wavelength conversion layer 150 includes a color filter that transmits only the wavelength of light emitted from the light-emitting portion EP to the substrate 100 that corresponds to the color in the pixel. For example, the wavelength conversion layer 150 may transmit only red, green, or blue wavelengths. In the light-emitting display device according to this disclosure, when a unit pixel P includes adjacent first to fourth sub-pixels SP, the wavelength conversion layer disposed in the first sub-pixel may include a red color filter, the wavelength conversion layer disposed in the second sub-pixel may include a green color filter, and the wavelength conversion layer disposed in the third sub-pixel may include a blue color filter. In the fourth sub-pixel, no wavelength conversion layer is disposed, allowing white light to be emitted from it.

[0070] A planarization layer 170 may be disposed on the substrate 100 to cover (or cover) the protective layer 130. When the protective layer 130 is omitted, the planarization layer 170 may be disposed on the substrate 100 to cover (or cover) the pixel circuitry portion. The planarization layer 170 may be disposed over the entire area of ​​the circuitry region CA and the light-emitting region EA. Furthermore, the planarization layer 170 may be disposed over the entire display area and the remaining portion of the non-display area excluding the pad area. For example, the planarization layer 170 may include an extension (or extension portion) extending from or into the display area to the remaining portion of the non-display area excluding the pad area. Therefore, the planarization layer 170 may have a size relatively larger than the display area.

[0071] The planarization layer 170 according to embodiments of this disclosure is configured to have a relatively large thickness, such that the planarization layer 170 can provide a planarized surface on the display area AA. For example, the planarization layer 170 can be formed of organic materials such as photoacrylic acid, benzocyclobutene, polyimide, fluoropolymer, etc.

[0072] The planarization layer 170 may include a light extraction pattern 180 disposed at the pixel region PA. The light extraction pattern 180 may be disposed on the upper surface 170a of the planarization layer 170 to overlap with the light-emitting region EA of the pixel region PA. The light extraction pattern 180 is disposed on the planarization layer 170 of the light-emitting region EA to have a curved (or uneven) shape, thereby altering the travel path of light emitted from the light-emitting device layer EDL to increase the light extraction efficiency of pixel P. The light extraction pattern 180 may be configured by connecting multiple lens shapes whose protruding surfaces face the substrate 100. For example, the light extraction pattern 180 may include multiple convex lenses facing the substrate 100. The light extraction pattern 180 may have a size relatively larger than the light-emitting region EA of the sub-pixel SP. For example, the light extraction pattern 180 may be an uneven pattern portion, a microlens, or a light-scattering pattern.

[0073] The light-emitting portion EP is disposed at the light extraction pattern 180 of the light-emitting region EA, and the light-emitting portion EP can emit light toward the substrate 100 according to the bottom light emission type. The light-emitting portion EP according to the embodiments of the present disclosure may include a first electrode E1, a light-emitting device layer EDL, and a second electrode E2.

[0074] The first electrode E1 is disposed on the planarization layer 170 of the pixel region PA and can be electrically connected to the source electrode 119s of the driving thin-film transistor Tdr. The end of the first electrode E1 near the circuit region CA can be electrically connected to the source electrode 119s of the driving thin-film transistor Tdr through the electrode contact hole CH disposed in the planarization layer 170 and the protective layer 130.

[0075] The first electrode E1 is in direct contact with the light extraction pattern 180, thereby having a shape corresponding to the light extraction pattern 180. Since the first electrode E1 is disposed (or deposited) on the planarization layer 170 and configured to have a relatively small thickness, the first electrode E1 can have a surface morphology (or second surface shape) consistent with the surface morphology (or first surface shape) of the light extraction pattern 180, which includes protrusions 183 and multiple recesses 181. For example, based on the surface shape (morphology) of the light extraction pattern 180, the first electrode E1 is formed in a conformal shape using a transparent conductive material deposition process, thereby allowing the first electrode E1 to have a cross-sectional structure with the same shape as the light extraction pattern 180.

[0076] A light-emitting device layer (EDL) is disposed on the first electrode E1 and can directly contact the first electrode E1. Since the EDL is disposed (or deposited) on the first electrode E1 and configured to have a relatively larger thickness than the first electrode E1, the EDL can have a surface morphology (or third surface shape) different from the surface morphology of each of the protrusions 183 and the plurality of recesses 181 or the surface morphology of the first electrode E1. For example, the EDL can be formed in a non-conformal shape that is inconsistent with the surface shape (or morphology) of the first electrode E1 by a deposition process, thereby allowing the EDL to have a cross-sectional structure with a shape different from that of the first electrode E1.

[0077] According to embodiments of this disclosure, the light-emitting device layer (EDL) can be configured to have a thickness that gradually increases toward the bottom surface of the protrusion 183 or the recess 181. For example, the EDL can be configured to have a first thickness on the top of the protrusion 183, a second thickness on the bottom surface of the recess 181, wherein the second thickness is relatively greater than the first thickness, and a third thickness on the inclined surface (or curved surface) of the protrusion 183, wherein the third thickness is relatively less than the first thickness. Here, each of the first, second, and third thicknesses can be the shortest distance between the first electrode E1 and the second electrode E2.

[0078] The light-emitting device layer (EDL) according to embodiments of this disclosure includes two or more light-emitting layers for emitting white light. As an example, the EDL may include a first light-emitting layer and a second light-emitting layer to emit white light by mixing a first light and a second light. For example, the first light-emitting layer may include any one selected from a blue light-emitting layer, a green light-emitting layer, a red light-emitting layer, a yellow light-emitting layer, and a yellow-green light-emitting layer to emit the first light. For example, the second light-emitting layer may include a light-emitting layer capable of emitting a second light to obtain white light in the light-emitting portion (EP) by mixing with the first light from the blue light-emitting layer, green light-emitting layer, red light-emitting layer, yellow light-emitting layer, or yellow-green light-emitting layer. As another embodiment, the EDL may include any one selected from a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer.

[0079] A second electrode E2 is disposed on the light-emitting device layer EDL and can directly contact the light-emitting device layer EDL. The second electrode E2 can be disposed (or deposited) on the light-emitting device layer EDL and can be configured to have a relatively smaller thickness than the light-emitting device layer EDL. Since the second electrode E2 is disposed (or deposited) on the light-emitting device layer EDL and configured to have a relatively smaller thickness than the light-emitting device layer EDL, the second electrode E2 can have a surface morphology consistent with the surface morphology of the light-emitting device layer EDL. For example, the second electrode E2 can be formed by a deposition process with a conformal shape corresponding to the surface shape (or morphology) of the light-emitting device layer EDL, thereby the second electrode E2 can have a cross-sectional structure with the same shape as the light-emitting device layer EDL.

[0080] The second electrode E2 according to embodiments of this disclosure may include a metallic material with high reflectivity to reflect incident light emitted from the light-emitting device layer EDL back to the substrate 100. For example, the second electrode E2 may include a single-layer or multi-layer structure selected from any one of aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), magnesium (Mg), calcium (CA), or barium (Ba), or an alloy of two or more materials selected from aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), magnesium (Mg), calcium (CA), or barium (Ba). The second electrode E2 may also include an opaque conductive material with high reflectivity.

[0081] According to embodiments of the present disclosure, a light extraction pattern 180 can be disposed at a planarization layer 170 overlapping with the light-emitting region EA of pixel SP. The light extraction pattern 180 may include a plurality of recessed portions 181 and protrusions 183 between the plurality of recessed portions 181.

[0082] Each of the plurality of recessed portions 181 may be recessed from the upper surface of the planarization layer 170 to face the substrate 100 relative to the flat surface of the planarization layer 170. Each of the plurality of recessed portions 181 may be configured to have the same depth relative to the upper surface 170a of the planarization layer 170. However, when performing a patterning process for the light extraction pattern 180, some of the recessed portions 181 may have different depths.

[0083] The display device may also include a dam 190, which is configured to define a light-emitting area EA.

[0084] A dam layer 190 can be disposed at the edge of the first electrode E1 and the planarization layer 170. The dam layer 190 can overlap with the edge of the wavelength conversion layer 150. For example, the dam layer 190 can be formed of an organic material such as a belozocyclobutene (BCB)-based resin, an acrylic resin, or a polyimide resin. The dam layer 190 can be formed of a photosensitizer including a black pigment. In this case, the dam layer 190 can also serve as a light-shielding member between adjacent pixels.

[0085] A dam layer 190 is disposed on the upper surface 170a of the planarization layer 170 and is configured to cover (or cover) the edge of the first electrode E1 extending onto the circuit region CA, and is also configured to cover (or cover) the edge of the light extraction pattern 180. The light-emitting region EA defined by the dam layer 190 can be formed to have a smaller size than the region of the light extraction pattern 180 of the planarization layer 170.

[0086] The light-emitting device layer (EDL) can be formed at the first electrode E1, the dam layer 190, and the step difference between the first electrode E1 and the dam layer 190. In this case, when the EDL is set to a thin thickness at the step difference between the first electrode E1 and the dam layer 190, the second electrode E2 and the first electrode E1 may make electrical contact (or short-circuit) with each other due to the reduced thickness of the EDL. To prevent this problem, the outermost dam line corresponding to one end 191 of the dam layer 190 is configured to cover (or cover) the edge of the light extraction pattern 180, thereby reducing the step difference between the first electrode E1 and the dam layer 190 and preventing a short circuit (or short circuit) between the first electrode E1 and the second electrode E2.

[0087] Reference Figure 4 Each of the plurality of recessed portions 181 can be arranged parallel to a first direction X at fixed intervals, and simultaneously configured to have a predetermined gap corresponding to one of the light extraction patterns 180, and can be arranged at predetermined intervals in a second direction Y intersecting the first direction X. For example, the plurality of recessed portions 181 can be arranged in a grid shape with predetermined intervals, and adjacent light extraction patterns 180 along the second direction Y can be staggered, such that the recessed portions 181 can be spaced apart from each other in the second direction Y. Therefore, when adjacent recessed portions 181 arranged along the first direction X are connected to each other, the adjacent recessed portions 181 can be connected to each other in a straight line. When adjacent recessed portions 181 arranged along the second direction Y can be connected to each other, the adjacent recessed portions 181 can be connected to each other in a zigzag line Z. For example, the straight line or the zigzag line Z can pass through the center of the adjacent recessed portions 181.

[0088] The center of each of the three adjacent recessed portions 181 can form a triangular shape TS. Furthermore, each of the plurality of recessed portions 181 can be surrounded by six adjacent recessed portions 181. In this case, the center of each of the six recessed portions 181 surrounding one recessed portion 181 can form a hexagonal shape HS with a two-dimensional structure. For example, the plurality of recessed portions 181 can be arranged or configured in a honeycomb structure, a cellular structure, or a circular structure.

[0089] The spacing (or interval) between the multiple recessed portions 181 arranged in each sub-pixel of the multiple sub-pixels SP can be the same or different from each other. Here, the spacing between the recessed portions 181 can be the distance (or interval) between the center points of two adjacent recessed portions 181.

[0090] As an implementation, the spacing between each recessed portion 181 in the red, green, and blue sub-pixels constituting a unit pixel can be the same or different from each other. For example, the spacing between the recessed portions 181 in the green sub-pixel can be different from the spacing between the recessed portions 181 in the blue sub-pixel, but the implementation of this disclosure is not limited thereto.

[0091] In another embodiment, the spacing between each recessed portion 181 in the red, green, blue, and white sub-pixels constituting a unit pixel P can be the same or different from each other. For example, the spacing between the recessed portions 181 in the white and / or green sub-pixels can be different from the spacing between the recessed portions 181 in the red and / or blue sub-pixels, but the embodiments of this disclosure are not limited thereto.

[0092] The protrusion 183 can be disposed on the planarization layer 170 overlapping the light-emitting region EA, to have a shape that maximizes the external extraction efficiency of light generated in the sub-pixel SP based on the effective light-emitting region of the light-emitting portion EP. The protrusion 183 can increase the external extraction efficiency of light emitted from the light-emitting portion EP by changing the travel path of light emitted from the light-emitting portion EP to the substrate 100.

[0093] The protruding portion 183 can be implemented individually surrounding each of the plurality of recessed portions 181. For example, the protruding portion 183 may include the bottom surface (or base surface) of each of the plurality of recessed portions 181 and an inclined surface sloping in all directions from the bottom surface. Therefore, the planarization layer 170 overlapping the light-emitting region EA may include a plurality of recessed portions 181 surrounded by the protruding portion 183. The protruding portion 183 surrounding a recessed portion 181 may have a hexagonal shape (or honeycomb shape) with a two-dimensional structure.

[0094] The end 191 of the exposed light-emitting area EA of the dam layer 190 is located within the first electrode E1 on which the light extraction pattern 180 is disposed, relative to the edge of the first electrode E1, and is located at the recessed portion 181 of the outermost light extraction pattern 180. The end 191 of the dam layer 190 may be the outermost dam line, or it may be the starting point that contacts the first electrode E1, or it may be a line of the dam layer 190 that defines the opening area of ​​the light-emitting area EA. The end 191 of the dam layer 190 is configured to have a serrated shape in a plan view. The end 191 of the dam layer 190 may be configured to overlap with all the recessed portions 181 of the outermost light extraction pattern 180 disposed within at least one sub-pixel SP.

[0095] Reference Figure 5A and Figure 5B The end 191 of the dam layer 190 can be located at the recessed portion 181 of the outermost light extraction pattern 180, such that the protruding portion 183 of the outermost light extraction pattern 180 can be exposed without being covered by the dam layer 190 (or covered by the dam layer 190). In this case, the end 191 of the dam layer 190 can be configured to expose the inclined surface between the outermost recessed portion 181 and the protruding portion 183 facing the light-emitting area EA.

[0096] When the end 191 of the dam layer 190 is positioned within the recess 181 of the outermost light extraction pattern 180, the light-emitting region EA can be widened to increase the aperture ratio, thereby improving brightness. When the end 191 of the dam layer 190 is positioned at the recess 181 of the outermost light extraction pattern 180, the light-emitting region EA can be widened to the maximum extent, thereby increasing the aperture ratio and brightness.

[0097] When the end 191 of the embankment 190 is positioned at the recessed portion 181 of the outermost light extraction pattern 180, and the inclined surface between the outermost recessed portion 181 and the protrusion 183 facing the light-emitting area EA is exposed, as... Figure 5C As shown, light emitted from the light-emitting device layer EDL can be reflected by the second electrode E2, which is located on the inclined surface between the recessed portion 181 and the protruding portion 183, without being captured by the dam layer 190 or the protruding portion 183 of the light extraction pattern 180, and can be extracted forward. When the end 191 of the dam layer 190 is located at the recessed portion 181 of the outermost light extraction pattern 180, the inclined surface of the light extraction pattern 180 can be exposed, thereby increasing the reflection by the second electrode E2, which acts as a reflector, and thus increasing the light extraction efficiency.

[0098] Reference Figure 6A and Figure 6BThe end 191 of the embankment 190 can be in the form of a diagonal line connected to the plan view or a wave pattern.

[0099] In the display device according to this disclosure, the end 191 of the dam layer 190 is located in the recessed portion 181 of the outermost light extraction pattern 180 and is configured to cover (or cover) the edge of the light extraction pattern 180, thereby increasing the aperture ratio and thus improving the luminous efficiency. Furthermore, the step difference between the first electrode E1 and the dam layer 190 can be reduced, thereby preventing a short circuit (or short circuit) between the first electrode E1 and the second electrode E2.

[0100] In the display device according to this disclosure, the end 191 of the embankment 190 is located at the recessed portion 181 of the outermost light extraction pattern 180, thereby minimizing the trapped internal light and increasing the amount of light reflected by the second electrode E2. Therefore, the light extraction efficiency of the light extraction pattern 180 can be maximized, thereby improving the efficiency and brightness of the display device.

[0101] Figure 7 The planar structure of a pixel according to a second embodiment of the present disclosure is shown.

[0102] Reference Figure 7 A display device according to another embodiment of the present disclosure may include a plurality of pixels, wherein a unit pixel P may be configured to include a plurality of sub-pixels SP. A pixel P may include four sub-pixels SP. A sub-pixel SP may include a pixel region PA and a circuit region CA. The pixel region PA may include a light-emitting region EA. The light-emitting region EA may be an opening region. In the following description, the remainder except for the light extraction pattern 280 and the embankment layer 290 of the planarization layer 270 are the same as those described above. Figures 1 to 3 Since the descriptions are the same, repeated descriptions can be omitted or given briefly.

[0103] The light extraction pattern 280 of the planarization layer 270 is disposed within the pixel region PA of all sub-pixels SP. For example, the sub-pixels SP include red sub-pixels, white sub-pixels, blue sub-pixels, and green sub-pixels. In a display device according to another embodiment of the present disclosure, the end 291 of the dike layer 290 covering (or covering) the light extraction pattern 280 disposed in the blue sub-pixel may be disposed differently from the end 291 of the light extraction pattern 280 covering (or covering) the light extraction pattern 280 disposed in adjacent other pixels. The end 291 of the dike layer 290 may be the outermost dike line, or it may be the starting point of contacting the first electrode E1, or it may be a line of the dike layer 190 for defining the opening region EA.

[0104] Reference Figure 8The edge region "C" of the embankment 290 of the sub-pixel SP other than the blue sub-pixel B, for example, the end 291 of the embankment 290 in the white sub-pixel, can be provided in the recessed portion 281 of the light extraction pattern 280 along the second direction Y, or can be alternately provided in the protruding portion 283 of the light extraction pattern 280. The end of the embankment 290 in the second direction Y can be provided in the recessed portion 281 of the light extraction pattern 280 provided in a row (X direction), and can be provided in the protruding portion 283 of the light extraction pattern 280 provided in the next row (X direction) of the aforementioned row.

[0105] The dam layer 290 can be disposed on the upper surface of the planarization layer 270 to cover (or cover) the edge of the first electrode E1 extending onto the circuit region CA, and can be configured to cover (or cover) the edge of the light extraction pattern 280. In a plan view, the light-emitting region EA defined by the dam layer 290 can be formed to have a smaller size than the light extraction pattern 280 of the planarization layer 270.

[0106] Reference Figure 9A and Figure 9B The end 291 of the embankment 290 of the remaining pixels, except for the blue sub-pixel B, can be located in the recessed portion 281 or the protruding portion 283.

[0107] The light-emitting device layer (EDL) can be formed at the first electrode E1, the dam layer 190, and the step difference between the first electrode E1 and the dam layer 190. In this case, when the EDL is set to a thin thickness at the step difference between the first electrode E1 and the dam layer 190, the second electrode E2 and the first electrode E1 may make electrical contact (or short-circuit) with each other due to the reduced thickness of the EDL. To prevent this problem, the end 291 of the dam layer 290 is configured to cover (or cover) the edge of the light extraction pattern 280, thereby reducing the step difference between the first electrode E1 and the dam layer 290 and preventing a short circuit (or short circuit) between the first electrode E1 and the second electrode E2.

[0108] Reference Figure 10 The light extraction pattern 280 of the blue subpixel B may include a plurality of recessed portions 281 and a protrusion 283 located between the plurality of recessed portions 281.

[0109] Each of the plurality of recessed portions 281 may be recessed from the upper surface of the planarization layer 170 to face the substrate 100 relative to the flat surface of the planarization layer 270. Each of the plurality of recessed portions 281 may have the same depth relative to the upper surface of the planarization layer 270. However, when performing a patterning process for the light extraction pattern 280, some of the recessed portions 281 may be configured to have different depths or (different heights).

[0110] Multiple recessed portions 281 can be arranged parallel to each other at fixed intervals along a first direction X, and can be arranged in a zigzag shape along a second direction Y. For example, multiple recessed portions 281 can be arranged in a grid shape with predetermined intervals, and can be staggered with each other along the second direction Y. Therefore, when adjacent recessed portions 281 arranged along the first direction X are connected to each other, adjacent recessed portions 281 can be connected to each other in a straight line. However, when adjacent recessed portions 281 arranged along the second direction Y can be connected to each other, adjacent recessed portions 281 can be connected to each other in a zigzag line Z. For example, a straight line or a zigzag line Z can pass through the center of adjacent recessed portions 281.

[0111] The center of each of the three adjacent recessed portions 281 can form a triangular shape TS. Furthermore, each of the plurality of recessed portions 281 can be surrounded by six adjacent recessed portions 281. In this case, the center of each of the six recessed portions 281 surrounding one recessed portion 281 can form a hexagonal shape HS with a two-dimensional structure. For example, the plurality of recessed portions 281 can be arranged or configured in a honeycomb structure, a cellular structure, or a circular structure.

[0112] The protruding portion 283 can be disposed on the planarization layer 270 overlapping with the light-emitting region EA, having a shape that maximizes the external extraction efficiency of light generated in the sub-pixel SP based on the effective light-emitting region of the light-emitting portion EP. The protruding portion 283 can increase the external extraction efficiency of light emitted from the light-emitting portion EP by changing the propagation path of light emitted from the light-emitting portion EP to the substrate 100.

[0113] The protruding portion 283 can be implemented individually surrounding each of the plurality of recessed portions 281. For example, the protruding portion 283 may include the bottom surface (or base surface) of each of the plurality of recessed portions 181 and an inclined surface sloping from the bottom in all directions. Therefore, the planarization layer 270 overlapping the light-emitting region EA may include a plurality of recessed portions 281 surrounded by the protruding portion 283. The protruding portion 283 surrounding a recessed portion 181 may have a hexagonal shape (or honeycomb shape) with a two-dimensional structure.

[0114] The dam layer 290 in the blue sub-pixel can be disposed at the edge between the first electrode E1 and the planarization layer 270. The dam layer 290 can be formed of an organic material such as a belozocyclobutene (BCB)-based resin, an acrylic resin, or a polyimide resin. The dam layer 290 can also be formed of a photosensitizer including a black pigment. In this case, the dam layer 290 can also serve as a light-shielding member between adjacent pixels.

[0115] A dam layer 290 is disposed on the upper surface of the planarization layer 270 to cover (or cover) the edge of the first electrode E1 extending onto the circuit region CA, and is configured to cover (or cover) the edge of the light extraction pattern 280. The light-emitting region EA defined by the dam layer 290 can be formed to have a smaller size than the light extraction pattern 280 of the planarization layer 270.

[0116] The end 291 of the embankment 290 in the blue sub-pixel B is provided at the recessed portion 281 of the light extraction pattern 280 arranged in a row (X direction) along the second direction Y, and is provided at the recessed portion 281 of the light extraction pattern 280 arranged in the next row (X direction) of the above row.

[0117] Reference Figure 11A and Figure 11B In the blue sub-pixel B, the end 291 of the exposed light-emitting area EA of the embankment 290 can be located inside the first electrode E1 on which the light extraction pattern 280 is disposed, relative to the edge of the first electrode E1, and can be located on the recessed portion 281 of the outermost light extraction pattern 280. In a planar view, the end 291 of the embankment 290 in the blue sub-pixel B can have a serrated shape. The end 291 of the embankment 290 in the blue sub-pixel B can be in the form of a wave pattern in a planar view. The end 291 of the embankment 290 in the blue sub-pixel B can be configured to overlap with all the recessed portions 281 of the outermost light extraction pattern 280 disposed in at least one sub-pixel SP.

[0118] The end 291 of the dam layer 290 in the blue sub-pixel B can be located at the recessed portion 281 of the outermost light extraction pattern 280, such that the protruding portion 283 of the outermost light extraction pattern 280 can be exposed without being covered by the dam layer 290 (or covered by the dam layer 290). In this case, the end 291 of the dam layer 290 can be configured to expose the inclined surface between the outermost recessed portion 281 of the blue sub-pixel B and the protruding portion 283 of the light-emitting area EA of the blue sub-pixel B. When the end 291 of the dam layer 290 can be located within the recessed portions 281 of all the outermost light extraction patterns 280 of the blue sub-pixel B, or when it can be configured in a sawtooth shape, the light-emitting area EA of the blue sub-pixel B can be widened to the maximum extent to increase the aperture ratio of the blue sub-pixel B, thereby improving brightness.

[0119] Typically, the luminous efficiency of blue subpixel B can be increased when the aperture ratio of the blue subpixel B, whose efficiency is relatively lower than that of other pixels, is increased. Since the end 291 of the embankment 290 of the blue subpixel B is located in the recessed portion 281 of the outermost light extraction pattern 280, the color temperature can be improved.

[0120] The light-emitting device layer (EDL) can be formed at the first electrode E1, the dam layer 290, and the step difference between the first electrode E1 and the dam layer 290. In this case, when the EDL is set to a thin thickness at the step difference between the first electrode E1 and the dam layer 290, the second electrode E2 and the first electrode E1 may make electrical contact (or short-circuit) with each other due to the reduced thickness of the EDL. To prevent this problem, the outermost dam line corresponding to one end 191 of the dam layer 290 is configured to cover (or cover) the edge of the light extraction pattern 280, thereby reducing the step difference between the first electrode E1 and the dam layer 290, and thus preventing a short circuit (or short circuit) between the first electrode E1 and the second electrode E2.

[0121] In another embodiment of the display device according to this disclosure, the end 291 of the dam layer 290 is disposed at the recessed portion 281 of the outermost light extraction pattern 280 of the pixels other than the blue sub-pixel B, such as the red sub-pixel R, the green sub-pixel G, and the white sub-pixel W, or the end 291 of the dam layer 290 is alternately disposed in the protruding portion 283 of the light extraction pattern 280. Furthermore, the end 291 of the dam layer 290 in the blue sub-pixel B is disposed at the recessed portion 281 of the outermost light extraction pattern 280, and the inclined surface of the outermost light extraction pattern 280 in the blue sub-pixel B is exposed, thereby increasing the reflection of the second electrode E2, which serves as a reflector, and thus increasing the efficiency and brightness in the blue sub-pixel B.

[0122] Figure 12The planar structure of pixel P according to a third embodiment of the present disclosure is shown.

[0123] The display device according to the third embodiment of this disclosure may include a plurality of pixels P, wherein a unit pixel P may be configured to include a plurality of sub-pixels SP. A pixel P may include four sub-pixels SP. A sub-pixel SP may include a pixel region PA and a circuit region CA. The pixel region PA may include a light-emitting region EA. The light-emitting region EA may be an opening region. In the following description, the remainder except for the planarization layer 370, the embankment layer 390, and the light extraction pattern 380 are the same as those described above. Figures 1 to 3 The descriptions are the same, and therefore repeated descriptions can be omitted or given briefly.

[0124] Light extraction pattern 380 is disposed in the planarization layer 370 of the pixel region PA of all sub-pixels SP. For example, sub-pixels SP include red sub-pixels R, white sub-pixels W, blue sub-pixels B, and green sub-pixels G. In the display device according to the third embodiment of the present disclosure, the end 391 of the embankment layer 390 covering (or covering) the light extraction pattern 380 disposed in the white sub-pixel W may be disposed differently from the end 391 of the embankment layer 390 covering (or covering) the light extraction pattern 380 disposed in adjacent other pixels (e.g., red sub-pixels, green sub-pixels, and blue sub-pixels).

[0125] The end 391 of the dam layer 390 can be the outermost dam line, or it can be the starting point of contact with the first electrode E1, or it can be the line of the dam layer 390 that defines the opening area of ​​the light-emitting region EA.

[0126] As referenced above Figures 1 to 6B In the embodiments described in this disclosure, the end 391 of the embankment 390 in each of the red sub-pixels R, blue sub-pixels B, and green sub-pixels G can be disposed at the recessed portion 381 of the outermost light extraction pattern 380, and the inclined surface of the outermost light extraction pattern 380 can be exposed without being covered by the embankment 390 (or covered by the embankment 390).

[0127] When the end 391 of the embankment 390 in each of the red sub-pixels R, blue sub-pixels B, and green sub-pixels G is positioned at the recessed portion 381 of the outermost light extraction pattern 380, the light-emitting area EA can be widened and the aperture ratio increased, thereby exposing the inclined surface of the light extraction pattern 380. Therefore, reflection by the second electrode E2, which serves as a reflector, can also be increased, thereby increasing the light extraction efficiency.

[0128] When the ends 391 of the embankment 390 in each of the red sub-pixels R, blue sub-pixels B, and green sub-pixels G are positioned at the recesses 381 of all the outermost light extraction patterns 380, the light-emitting region EA can be widened to the maximum extent, and the aperture ratio can be increased to the maximum extent, allowing all the inclined surfaces of the light extraction pattern 380 to be exposed. Therefore, the reflection of the second electrode E2, which serves as a reflector, can be maximized, thereby maximizing the light extraction efficiency.

[0129] In the planar diagram, the end 391 of the embankment 390 in each of the red sub-pixels R, blue sub-pixels B, and green sub-pixels G can be a non-linear shape, a zigzag shape, or a wave pattern shape.

[0130] Reference Figure 13 The end 391 of the embankment layer 390 in the white sub-pixel W may be located within the first electrode E1 relative to the edge of the first electrode E1, and may be located at the protrusion 383 of the outermost light extraction pattern 380. The end 391 of the embankment layer 390 in the white sub-pixel W may have a serrated shape in a planar view. The end 391 of the embankment layer 390 in the white sub-pixel W may have a wavy pattern shape in a planar view. The end 391 of the embankment layer 390 in the white sub-pixel W may be configured to overlap with all the protrusions 383 of the outermost light extraction pattern 380 disposed within the pixel SP.

[0131] The multiple recessed portions 381 of the light extraction pattern 380 in the white sub-pixel W can be arranged parallel to each other at fixed intervals along a first direction X, and can be arranged in a zigzag shape along a second direction Y. For example, the multiple recessed portions 381 can be arranged in a grid shape with predetermined intervals, and adjacent recessed portions 381 along the second direction Y can be staggered. The center of each of three adjacent recessed portions 381 can form a triangle shape TS. Furthermore, each of the multiple recessed portions 381 can be surrounded by six adjacent recessed portions 381. In this case, the center of each of the six recessed portions 381 surrounding a recessed portion 381 can be set to form a hexagon HS in a two-dimensional structure. For example, the multiple recessed portions 381 can be set or arranged to form a honeycomb or honeycomb structure or a circular structure.

[0132] The protruding portion 383 can be disposed on the planarization layer 370 overlapping with the light-emitting region EA, having a shape that maximizes the external extraction efficiency of light generated in the sub-pixel SP based on the effective light-emitting region of the light-emitting portion EP. The protruding portion 383 can increase the external extraction efficiency of light emitted from the light-emitting portion EP by changing the travel path of light emitted from the light-emitting portion EP toward the substrate 100.

[0133] The protruding portion 383 can be implemented individually surrounding each of the plurality of recessed portions 381. For example, the protruding portion 383 may include a bottom surface (or base surface) of each of the plurality of recessed portions 381 and an inclined surface sloping in all directions from the bottom surface. Therefore, the planarization layer 370 overlapping the light-emitting region EA may include a plurality of recessed portions 381 surrounded by the protruding portion 383. The protruding portion 383 surrounding a recessed portion 381 may have a hexagonal shape (or honeycomb shape) with a two-dimensional structure.

[0134] The end 391 of the embankment 390 in the white subpixel W can be disposed between the recessed portion 381 of each outermost light extraction pattern 380 and the recessed portion 381 of the previous light extraction pattern 380 disposed on the outermost light extraction pattern 380. The end 391 of the embankment 390 in the white subpixel W can be disposed to overlap with all the protrusions 383 of the outermost light extraction pattern 380.

[0135] Reference Figure 14A and Figure 14B The end 391 of the dam layer 390 of the white sub-pixel W is disposed at the protrusion 383 of the outermost light extraction pattern 380, and the protrusion 383 of the outermost light extraction pattern 380 can be covered by the dam layer 390 (or covered by the dam layer 390). At this time, the end 391 of the dam layer 390 can be configured to cover (or cover) the inclined surface between the outermost recessed portion 381 and the protrusion 383 facing the light-emitting region EA. The end 391 of the dam layer 390 in the white sub-pixel W can be disposed on each protrusion 383 of all the outermost light extraction patterns 380. The end 391 of the dam layer 390 in the white sub-pixel W can be disposed between the outermost light extraction pattern 380 and a previously outermost light extraction pattern 380. For example, the end 391 of the dam layer 390 in the white sub-pixel W can be disposed between the outermost light extraction pattern 380 and the light extraction pattern 380 adjacent to the outermost light extraction pattern 380.

[0136] When the end 391 of the embankment 390 in the white sub-pixel W is located at each protrusion 383 between the outermost light extraction pattern 380 and the previous light extraction pattern 380, or is located between the recess 381 of each outermost light extraction pattern 380 and the recess 381 of the previous light extraction pattern 380 of the outermost light extraction pattern 380, the reflective visibility of the display device can be reduced by reducing the diffuse component of light.

[0137] The display device according to this disclosure can adjust the light extraction efficiency by adjusting the position of the end of the dam layer and the light extraction pattern for each sub-pixel SP with different color temperatures.

[0138] The features, structures, and effects described above in this disclosure are included in at least one embodiment of this disclosure, but are not limited to only one embodiment. Furthermore, those skilled in the art can implement the features, structures, and effects described in at least one embodiment of this disclosure through combinations or modifications of other embodiments. Therefore, any content associated with combinations and modifications should be interpreted as being within the scope of this disclosure.

[0139] Furthermore, while the foregoing primarily describes embodiments, these are merely examples and not intended to limit the scope of this disclosure. It will be apparent to those skilled in the art that various modifications and variations can be made to this disclosure without departing from its spirit or scope. Therefore, this disclosure is intended to cover modifications and variations thereof, provided they fall within the scope of the appended claims and their equivalents.

Claims

1. A display device, comprising: Multiple sub-pixels are configured to include a light-emitting area; The planarization layer is configured to include multiple light extraction patterns having multiple recessed portions and multiple protruding portions in each of the plurality of sub-pixels; A light-emitting device layer is disposed at the planarization layer of each of the plurality of sub-pixels; as well as A dam layer is disposed between the planarization layer and the light-emitting device layer to expose the light-emitting area in each of the plurality of sub-pixels. The end of the embankment is configured to be located at the recessed portion of the outermost light extraction pattern of at least one of the plurality of sub-pixels, and The end of the embankment in the at least one sub-pixel is configured to have a non-linear shape to overlap with all the recessed portions of the outermost light extraction pattern disposed in the at least one sub-pixel.

2. The display device according to claim 1, wherein, The end of the embankment is configured to overlap with all the recessed portions of all the outermost light extraction patterns among the plurality of light extraction patterns.

3. The display device according to claim 1, in, The plurality of sub-pixels are configured to include red sub-pixels, white sub-pixels, blue sub-pixels, and green sub-pixels. The end of the embankment is located at the recessed portion of the outermost light extraction pattern in each of the red, white, blue, and green sub-pixels.

4. The display device according to claim 1, wherein, The plurality of sub-pixels are configured to include red sub-pixels, white sub-pixels, blue sub-pixels, and green sub-pixels. The ends of the embankment are alternately positioned at the recessed and protruding portions of the outermost light extraction pattern in each of the red, white, and green sub-pixels. The end of the embankment in the blue sub-pixel is located at the recessed portion of the outermost light extraction pattern.

5. The display device according to claim 4, wherein: The plurality of light extraction patterns are arranged parallel to each other along a first direction and staggered in a second direction intersecting the first direction. In each of the red, white, and green sub-pixels, the end of the embankment in a row relative to the second direction is located at the recessed portion of the outermost light extraction pattern, and the end of the embankment in the next row is located at the protruding portion of the outermost light extraction pattern.

6. The display device according to claim 4, wherein: The plurality of light extraction patterns are arranged parallel to each other along a first direction and staggered in a second direction intersecting the first direction. In the blue sub-pixel, the end of the embankment layer disposed in a row relative to the second direction is disposed at the recessed portion of the outermost light extraction pattern, and the end of the embankment layer disposed in the next row of the row is disposed at the recessed portion of the outermost light extraction pattern.

7. The display device according to claim 1, wherein: The plurality of sub-pixels are configured to include red sub-pixels, white sub-pixels, blue sub-pixels, and green sub-pixels. In each of the red, blue, and green sub-pixels, the end of the dike layer is positioned at the recessed portion of the outermost light extraction pattern, and The end of the embankment in the white sub-pixel is located at the protruding part of the outermost light extraction pattern.

8. The display device according to claim 7, in, The end of the embankment in the white sub-pixel is configured to overlap with all the protrusions of the outermost light extraction pattern.

9. The display device according to claim 1, in, The plurality of sub-pixels are configured to include red sub-pixels, white sub-pixels, blue sub-pixels, and green sub-pixels, and The end of the embankment in the white sub-pixel is positioned between the outermost light extraction pattern and another light extraction pattern adjacent to the outermost light extraction pattern.

10. The display device according to claim 1, wherein: Among the plurality of recessed portions, adjacent recessed portions along a first direction are connected to each other in a straight line, and Among the plurality of recessed portions, the recessed portions adjacent to each other along a second direction intersecting the first direction are connected by a zigzag line.

11. The display device according to any one of claims 1 to 10, further comprising: A substrate is configured to include the plurality of sub-pixels; The pixel circuit section is disposed on the substrate; A protective layer is provided at the pixel circuit portion; as well as A wavelength conversion layer is disposed between the substrate and the planarization layer to overlap with the light-emitting region.

12. The display device according to any one of claims 1 to 10, further comprising: The first electrode is disposed at the planarization layer of each of the plurality of sub-pixels and is formed of a transparent conductive material; as well as The second electrode is disposed at the light-emitting device layer and is formed of an opaque conductive material with high reflectivity.

13. The display device according to any one of claims 1 to 10, wherein, The non-linear shape includes a sawtooth shape or a wave pattern shape.

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