Light emitting display device

Abstract

A light emitting display device includes a substrate including a plurality of pixels configured to include an emission region, a light extraction pattern configured to include a plurality of recesses disposed in the emission region, and a light emitting portion disposed above the light extraction pattern. At least one of the plurality of recesses has a curvature of 0.217 μm ‑1 to 0.311 μm ‑1 .

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2020-0179574, filed on December 21, 2020, which is incorporated herein by reference as fully set forth herein. Technical Field

[0003] This disclosure relates to light-emitting display devices. Background Technology

[0004] Unlike liquid crystal displays, light-emitting displays have high response speed and low power consumption and spontaneously emit light without using a specific light source. Therefore, light-emitting displays do not cause viewing angle problems and are therefore attracting attention as the next generation of flat panel displays.

[0005] Emitting light displays display images by emitting light from an emitting element comprising an emitting layer placed between two electrodes. In this case, the light generated by emitting light from the emitting element is released outward through electrodes, a substrate, etc. However, in such emitting light displays, due to total internal reflection at the interface between the emitting layer and the electrodes and / or the interface between the substrate and the air layer, some of the light emitted from the emitting layer is not released outward, thus reducing the light extraction efficiency. Therefore, the problem with emitting light displays is that the low light extraction efficiency leads to reduced brightness and increased power consumption. Summary of the Invention

[0006] Therefore, this disclosure aims to provide a display device that substantially eliminates one or more problems caused by the limitations and disadvantages of related technologies.

[0007] One aspect of this disclosure is to provide a light-emitting display device capable of improving the light extraction efficiency of light emitted from a light-emitting part.

[0008] The purpose of this disclosure is not limited to the above-described purposes, and other purposes not described herein will be clearly understood by those skilled in the art based on the following description.

[0009] To achieve these and other aspects of the inventive concept, as specifically embodied and broadly described herein, a light-emitting display device includes: a substrate comprising a plurality of pixels configured to include emitting regions; a light extraction pattern configured to include a plurality of recesses disposed in the emitting regions; and a light-emitting portion disposed on the light extraction pattern; at least one of the plurality of recesses having a diameter of 0.217 μm. -1 Up to 0.311μm -1The curvature. In another aspect of this disclosure, the light-emitting display device includes: a substrate including a plurality of pixels configured to include an emitting region; a planarization layer disposed in the emitting region and configured to include a light extraction pattern, the light extraction pattern including a plurality of recesses spaced apart from each other and a protrusion surrounding each of the plurality of recesses; a first electrode disposed above the light extraction pattern; a light-emitting device layer disposed above the first electrode; and a second electrode disposed above the light-emitting device layer; at least one of the plurality of recesses has a curvature of 0.217 μm. -1 Up to 0.311μm -1 The curvature.

[0010] In addition to the means used to solve the above problems, specific details of various examples according to this specification are also included in the following description and figures.

[0011] By using the light-emitting display device according to the present disclosure, the light extraction efficiency of light emitted from the light-emitting part can be improved, thereby increasing brightness and reducing power consumption.

[0012] In addition to the effects of this disclosure described above, those skilled in the art will clearly understand other purposes of this disclosure based on the following description. Attached Figure Description

[0013] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0014] Figure 1 This is a schematic diagram illustrating a light-emitting display device according to an embodiment of the present disclosure.

[0015] Figure 2 It is shown Figure 1 The image shows a cross-sectional view of one pixel.

[0016] Figure 3 yes Figure 2 An enlarged view of part "A" shown in the image.

[0017] Figure 4 It is shown Figure 2 The image shows a plan view of the light extraction pattern.

[0018] Figure 5 yes Figure 4 An enlarged view of part "B" shown.

[0019] Figure 6 It is along Figure 4 The cross-sectional view shown is taken from line I-I'.

[0020] Figure 7 It is shown Figure 4 A plan view of a recess and six peaks shown.

[0021] Figure 8 This is a graph showing the increase rate of current efficiency of a pixel in a light-emitting display device according to an embodiment of the present disclosure relative to the spacing between two adjacent recesses.

[0022] Figure 9 This is a graph showing the rate of increase in current efficiency of a pixel relative to the curvature of a recess in a light-emitting display device according to an embodiment of the present disclosure. Detailed Implementation

[0023] Implementations of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations relevant to this document will be omitted where such descriptions are deemed unnecessarily obscuring the essential points of the inventive concept. The described progression of processing steps and / or operations is exemplary; however, the sequence of steps and / or operations is not limited to the sequence set forth herein, except that they must occur in a specific order, and may be varied as is known in the art. Throughout the document, the same reference numerals denote the same elements. The names of the various elements used in the following explanation are chosen solely for convenience of writing the specification and may therefore differ from the names of elements used in actual products.

[0024] The advantages and features of this disclosure and its implementation methods will be illustrated by the following description of embodiments with reference to the accompanying drawings. However, this 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 this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0025] The shapes, dimensions, scales, angles, and numbers shown in the accompanying drawings to describe embodiments of this disclosure are merely examples, and therefore, this disclosure is not limited to the details shown. Throughout the specification, the same reference numerals refer to the same elements. In the following description, detailed descriptions of related known functions or configurations will be omitted where they are determined to unnecessarily obscure the essential points of this disclosure. Where terms such as “comprising,” “having,” and “including” are used in this disclosure, additional terms may be added unless “only” is used. Unless otherwise stated, singular terms may include plural forms.

[0026] When interpreting a component, although there is no explicit description, the component is interpreted as including a range of error.

[0027] When describing positional relationships, for example, when the positional relationship between two parts is described as “above,” “on top,” “below,” and “near,” one or more other parts may be placed between the two parts unless more restrictive terms such as “exactly” or “directly” are used.

[0028] When describing temporal relationships, such as when time sequence is described as "after", "following", "next" and "before", discontinuous situations may be included unless more restrictive terms such as "exactly", "immediately" or "directly" are used.

[0029] In describing the elements of this disclosure, terms such as first, second, A, B, (a), (b), etc., may be used. Such terms are used only to distinguish the corresponding element from other elements, and the corresponding element is not limited in its nature, order, or priority by these terms. It should be understood that when an element or layer is referred to as being "on" or "coupled to" another element or layer, it may be directly on or directly coupled to the other element or layer, or there may be intermediate elements or layers. Furthermore, it should be understood that when an element is disposed on or under another element, this may indicate a situation where these elements are disposed in direct contact with each other, but it may also indicate that these elements are disposed not in direct contact with each other.

[0030] The term "at least one" should be understood to include any one or more of the associated listed elements and all combinations thereof. For example, "at least one of the first element, the second element, and the third element" means a combination of all elements derived from two or more of the first element, the second element, and the third element, as well as the first element, the second element, or the third element.

[0031] The term “around” as used herein includes at least partially surrounding and completely surrounding one or more of the associated elements. Similarly, the term “cover” as used herein includes at least partially covering and completely covering one or more of the associated elements. For example, if an encapsulation layer surrounds a weir pattern, this can be interpreted as the encapsulation layer at least partially surrounding the weir pattern. However, in some embodiments, the encapsulation layer may completely surround the weir pattern. The meaning of the term “around” as used herein may be further specified based on the associated drawings and embodiments. In this disclosure, the terms “around,” “at least partially surrounding,” “completely surrounding,” etc., are used. Based on the definition of “around” set forth above, when the term “around” is used only in embodiments, it can mean at least partially surrounding or completely surrounding one or more of the associated elements. The same applies to the term “cover.”

[0032] As will be fully understood by those skilled in the art, the features of the various embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may cooperate with each other and be technically driven in various ways. Embodiments of this disclosure may be performed independently of each other or may be performed together in an interdependent relationship.

[0033] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to elements in each drawing, the same reference numerals may refer to the same elements even though the same elements are shown in other drawings. Furthermore, for ease of description, the scale of each element shown in the drawings differs from the actual scale, and is therefore not limited to the scale shown in the drawings.

[0034] Figure 1 This is a schematic diagram illustrating a light-emitting display device according to an embodiment of the present disclosure.

[0035] Reference Figure 1 The light-emitting display device according to the embodiments of the present disclosure may include a display panel 10 and a panel driving circuit portion.

[0036] The display panel 10 may include a substrate 100 and a opposing substrate 300 that are bonded to each other.

[0037] The substrate 100 includes a thin-film transistor, and the substrate 100 may be a first substrate, a lower substrate, a transparent glass substrate, or a transparent plastic substrate. The substrate 100 may include a display area AA and a non-display area IA.

[0038] The display area AA is an area used to display images. The display area AA can be a pixel array area, an active area, 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.

[0039] Each of the plurality of pixels P can be defined as a unit region in which light is actually emitted. According to one embodiment, three pixels arranged adjacently or along a first direction X constitute a unit pixel UP in the plurality of pixels P. For example, a unit pixel may include at least one red pixel, at least one green pixel, and at least one blue pixel, but the unit pixel structure is not limited thereto. According to another embodiment, four pixels arranged adjacently or along a first direction X constitute a unit pixel UP in the plurality of pixels P. A unit pixel may include at least one red pixel, at least one green pixel, at least one blue pixel, and at least one white pixel, but the unit pixel structure is not limited thereto. For example, each of the at least one red pixel, at least one green pixel, at least one blue pixel, and at least one white pixel may each be a sub-pixel.

[0040] Each of the plurality of pixels P may include a pixel circuit and a light-emitting portion connected to the pixel circuit. The light-emitting portion may include a light-emitting layer (or light-emitting device) disposed between a first electrode and a second electrode.

[0041] The non-display area IA is the area in which 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 may surround the display area AA. The display panel 10 or the substrate 100 may also include a peripheral circuit portion 120 disposed at the non-display area IA.

[0042] The peripheral circuitry 120 may include gate driving circuitry connected to a plurality of pixels P. The gate driving circuitry (or panel-embedded gate driving circuitry) may be integrated on one or both sides of the non-display area 1A of the substrate 100, depending on the thin-film transistor manufacturing process, and may be connected to the plurality of pixels P. For example, the gate driving circuitry may include a shift register known in the art.

[0043] The opposing substrate 300 can encapsulate (or seal) the display area AA disposed on the substrate 100. For example, 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 an encapsulation substrate.

[0044] Furthermore, the display panel 10 according to embodiments of this disclosure may also include an optical film disposed on a light extraction surface between the first substrate 100 and the opposing substrate 300, from which light emitted from the pixel P is emitted. For example, the optical film may also include a polarizing film attached to the rear or lower surface (or light extraction surface) of the substrate 100 or attached to the front or upper surface (or light extraction surface) of the substrate 300.

[0045] Figure 2 It is shown Figure 1 A cross-sectional view of one pixel shown, and Figure 3 yes Figure 2 An enlarged view of part "A" shown in the image.

[0046] Reference Figure 2 and Figure 3 According to embodiments of this disclosure, pixel P includes pixel region PA and circuit region CA.

[0047] A pixel region PA may include an emission region EA. A circuit region CA may be spatially separated from the emission region EA within pixel P. The emission region EA can be defined as the portion of pixel region PA excluding the circuit region CA. For example, the emission region EA may be an open area or an open portion. The circuit region CA may be a non-emission region, a non-open area, or a non-open portion.

[0048] An embodiment of the present disclosure of a light-emitting 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.

[0049] 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 due to 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 portion EP. Optionally, according to some embodiments of this disclosure, the buffer layer 110 may be omitted.

[0050] 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 electrode 115, an interlayer insulating layer 117, a drain electrode 119d, and a source electrode 119s.

[0051] The active layer 111 included in the driving thin-film transistor Tdr can be configured with a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxide and organic materials.

[0052] 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 only on the channel region 111c of the active layer 111 in an island-like manner, or it may be disposed on the entire surface of the buffer layer 110 or the substrate 100 including the active layer 111.

[0053] An interlayer insulating layer 117 may be disposed above the gate electrode 115 and the drain region 111d and source region 111s of the active layer 111. The interlayer insulating layer 117 may be formed over the entire area of ​​the emitter region EA and the circuit region CA. For example, the interlayer insulating layer 117 may be configured as an inorganic or organic material.

[0054] The pixel circuit section may also include at least one capacitor and at least one switching thin-film transistor disposed together with the driving thin-film transistor Tdr at the circuit region CA.

[0055] A capacitor can be disposed in the overlapping region of the gate electrode 115 and the source electrode 119s of the driving thin film transistor Tdr, wherein the interlayer insulating layer 117 is disposed between the gate electrode 115 and the source electrode 119s.

[0056] At least one switching thin-film transistor can be disposed at circuit region CA to have a structure substantially the same as that of the driving thin-film transistor Tdr; therefore, its repeated description can be omitted. At least one switching thin-film transistor can be switched (or driven) to initialize the voltage of the capacitor or to store a data voltage in the capacitor.

[0057] In addition, the pixel circuit section may also include a light blocking layer 101 disposed below (or beneath) the active layer 111 of at least one thin-film transistor disposed at the circuit region CA.

[0058] A light-blocking layer 101 may be disposed between the substrate 100 and the active layer 111, and may be used to minimize or prevent changes in the threshold voltage of the transistor caused by external light by blocking light incident on the active layer 111 via the substrate 100. The light-blocking layer 101 may be covered (or stacked or surrounded) by a buffer layer 110. Optionally, the light-blocking layer 101 may be electrically connected to the source electrode of the transistor or electrically connected to a separate bias power supply, and may serve as the lower gate electrode of a corresponding thin-film transistor. In this case, the light-blocking layer 101 may minimize or prevent both characteristic changes caused by light and threshold voltage changes caused by bias voltage.

[0059] A protective layer 130 may be disposed above the substrate 100 to cover (or superimpose) the transistor layer including the thin-film transistor. That is, the protective layer 130 covers (or superimposes) the drain electrode 119d and source electrode 119s of the driving thin-film transistor Tdr, as well as the interlayer insulating layer 117. For example, the protective layer 130 may be formed of an inorganic insulating material and may be referred to as a passivation layer. Optionally, the protective layer 130 may be omitted.

[0060] The planarization layer 170 can be disposed above the substrate 100 to cover (or superimpose) the protective layer 130. When the protective layer 130 is omitted, the planarization layer 170 can be disposed above the substrate 100 to cover (or superimpose) the pixel circuit portion. The planarization layer 170 can be disposed over the entire area of ​​the circuit region CA and the emission region EA. Furthermore, the planarization layer 170 can be disposed over the entire display region AA and the remaining portion of the non-display region IA, excluding the pad areas.

[0061] 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 over the display area AA. For example, the planarization layer 170 may be formed of organic materials such as photoacrylic acid, benzocyclobutene, polyimide, fluoropolymer, etc., but is not limited thereto.

[0062] 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 at the upper surface 170a of the planarization layer 170 to overlap with the emission region EA of the pixel region PA. The light extraction pattern 180 is disposed at the planarization layer 170 of the emission region EA to have a curved (or wavy, corrugated, undulating, or uneven) shape, thereby changing the travel path of light emitted from the light-emitting portion EP to improve the light extraction efficiency of the pixel P. The light extraction pattern 180 may be formed or implemented as a lens shape having convex and concave surfaces. Here, the convex and concave surfaces may be multiple curved concave surfaces alternating with curved concave surfaces to define a curved wavy surface. Other surface shapes may also be used. In the concave and convex surfaces, when viewed from the light-emitting surface, the concave surface forms a depression, and when viewed from the light-emitting surface, the convex surface forms a protrusion. For example, the light extraction pattern 180 may be referred to as a non-planar portion, an optical path control portion, a microlens portion, a microlens array, or a light scattering pattern.

[0063] The light extraction pattern 180 according to the embodiment may include a plurality of recesses 181 and protrusions 183 between the plurality of recesses 181.

[0064] Each of the plurality of recesses (or depressions) 181 may be recessed from the upper surface (or flat surface) 170a of the planarization layer 170 by a patterning process of the planarization layer 170. For example, the lower surface 181a of the plurality of recesses 181 may be located between the upper surface 170a of the planarization layer 170 and the substrate 100.

[0065] Each of the plurality of recesses 181 may be configured to have the same depth relative to the upper surface 170a of the planarization layer 170, but is not limited thereto. For example, some of the plurality of recesses 181 may have different depths within the error or tolerance range of the patterning process of the light extraction pattern 180.

[0066] The protrusion 183 (or convex portion) can be formed to connect with each other among the plurality of recesses 181. The protrusion 183 can be formed to surround each of the plurality of recesses 181. Therefore, the protrusion 183 can be formed or implemented to have a shape that maximizes or increases the external extraction efficiency of light emitted from the light-emitting portion EP. Thus, the protrusion 183 changes the propagation path of light emitted from the light-emitting portion EP toward the light extraction surface (or light output surface) to improve the external extraction efficiency of light emitted from the light-emitting portion EP. For example, the protrusion 183 can reduce or prevent a decrease in light extraction efficiency due to light being trapped in the light-emitting portion EP, or minimize such a decrease, by repeating total internal reflection in the light-emitting portion EP without advancing to the light extraction surface.

[0067] According to embodiments of this disclosure, the forming area (or arrangement area) of the light extraction pattern 180 within a pixel P can be larger than the emission area EA. For example, when the forming area (or arrangement area) of the light extraction pattern 180 is smaller than the emission area EA, light generated at the edge of the emission area EA may propagate to other adjacent pixels, thereby causing color mixing between adjacent pixels P.

[0068] The light extraction pattern 180, including multiple recesses 181 and protrusions 183, can be formed by a patterning process of the planarization layer 170 using a mask pattern formed on the planarization layer 170 of the emission region EA through a photolithography process using photoresist. For example, positive photoresist can be used as a photoresist to improve productivity.

[0069] The light-emitting part EP can be disposed above the light extraction pattern 180 of the emission region EA and can emit light to the substrate 100 according to the bottom emission type, but is not limited thereto. The light-emitting part EP according to the embodiment may include a first electrode E1, a light-emitting device layer EDL, and a second electrode E2.

[0070] The first electrode (or anode) E1 can be disposed above 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. One end of the first electrode E1 near the circuit region CA extends to the source electrode 119s of the driving thin-film transistor Tdr, and can then be electrically connected to the source electrode 119s of the driving thin-film transistor via the electrode contact hole CH formed in the planarization layer 170 and the protective layer 130.

[0071] The first electrode E1 can directly contact the light extraction pattern 180, thereby allowing the first electrode E1 to have a shape corresponding to the light extraction pattern 180. When 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) that conforms to the surface morphology (or first surface shape) of the light extraction pattern 180, which includes a plurality of recesses 181 and protrusions 183. For example, the first electrode E1 can be formed in a conformal shape based on the surface shape (morphology) of the light extraction pattern 180 by a transparent conductive material deposition process, thereby allowing the first electrode E1 to have a cross-sectional structure whose shape can be the same as that of the light extraction pattern 180.

[0072] The first electrode E1 according to the embodiment may include a transparent conductive material such as a transparent conductive oxide (TCO) so that light emitted from the light-emitting device layer EDL is transmitted to the substrate 100. For example, the first electrode E1 may be formed of indium tin oxide (ITO) or indium zinc oxide (IZO). For example, the first electrode E1 may be referred to as an anode, an anode electrode, a pixel electrode, a transparent electrode, a transparent pattern electrode, etc.

[0073] The light-emitting device layer (EDL) can be disposed on and in direct contact with the first electrode E1. Since the EDL is disposed (or deposited) on the first electrode E1 and configured to have a relatively large thickness compared to the first electrode E1, the EDL can have a surface morphology (or third surface shape) different from the surface morphology of each of the plurality of recesses 181 and protrusions 183 or the surface morphology of the first electrode E1. For example, the EDL can be formed by a deposition process in a non-conformal shape that does not conform to the surface shape (or morphology) of the first electrode E1, thereby allowing the EDL to have a cross-sectional structure whose shape may differ from that of the first electrode E1.

[0074] The light-emitting device layer (EDL) according to embodiments of this disclosure may have a thickness that gradually increases toward the bottom surface 181a of the recess 181. For example, the EDL may be formed on the protrusion 183 with a first thickness t1, on the bottom surface 181a of the recess 181 with a second thickness t2 that is thicker than the first thickness t1, and on the inclined portion between the top of the protrusion 183 and the bottom surface 181a of the recess 181 with a third thickness t3 that is less than the first thickness t1. Herein, each of the first thickness t1, the second thickness t2, and the third thickness t3 may correspond to the shortest distance between the first electrode E1 and the second electrode E2.

[0075] An EDL (Emitting Diode Layer) according to an embodiment of this disclosure includes two or more emitting layers for emitting white light. As an embodiment, the EDL may include a first emitting layer and a second emitting layer to emit white light by mixing a first light with a second light. For example, the first emitting layer may include any one selected from a blue emitting layer, a green emitting layer, a red emitting layer, a yellow emitting layer, and a yellow-green emitting layer to emit the first light. For example, the second emitting layer may include an emitting layer capable of emitting a second light, thereby obtaining white light in the EDL by mixing with the first light from the blue, green, red, yellow, or yellow-green emitting layer. An EDL according to another embodiment may include any one selected from a blue, green, and red emitting layer.

[0076] According to another embodiment of this disclosure, the light-emitting device layer (EDL) includes at least one light-emitting layer that emits blue light.

[0077] The second electrode E2 can be disposed on and in direct contact with the light-emitting device layer EDL. The second electrode E2 can be formed (or deposited) on the light-emitting device layer EDL to have a relatively smaller thickness than the light-emitting device layer EDL. Because the second electrode E2 has a relatively small thickness, it can have a surface morphology corresponding to the surface morphology of the light-emitting device layer EDL. For example, the second electrode E2 can be formed by a deposition process to a conformal shape corresponding to the surface shape (or morphology) of the light-emitting device layer EDL, thereby allowing the second electrode E2 to have the same cross-sectional structure as the light-emitting device layer EDL.

[0078] The second electrode E2 according to the embodiment may include a metallic material with high reflectivity so as to reflect incident light emitted from the light-emitting device layer EDL toward the substrate 100. The second electrode E2 may include an opaque conductive material with high reflectivity. For example, the second electrode E2 may include any one of the materials selected from aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), magnesium (Mg), calcium (Ca), or barium (Ba), or an alloy of two or more of the materials selected from aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), magnesium (Mg), calcium (Ca), or barium (Ba), in a single-layer or multi-layer structure. For example, the second electrode E2 may be referred to as a cathode, cathode electrode, common electrode, reflective electrode, etc.

[0079] The light-emitting display device according to embodiments of the present disclosure may further include a wavelength conversion layer 150.

[0080] The wavelength conversion layer 150 may be disposed between the substrate 100 and the planarization layer 170 to overlap with at least one emission region EA. According to one embodiment, the wavelength conversion layer 150 may be disposed between the protective layer 130 and the planarization layer 170 to overlap with the emission region EA. According to another embodiment, the wavelength conversion layer 150 may be disposed between the substrate 100 and the interlayer insulating layer 117 or between the interlayer insulating layer 117 and the protective layer 130 to overlap with the emission region EA.

[0081] The wavelength conversion layer 150 may have a larger size, i.e., a larger surface area, than the emission region EA. For example, the wavelength conversion layer 150 may be larger than the emission region EA, and / or smaller than the light extraction pattern 180 of the planarization layer 170, but is not limited thereto, and the wavelength conversion layer 150 may be larger than the light extraction pattern 180 of the planarization layer 170. For example, the wavelength conversion layer 150 may have a size corresponding to the entire pixel region PA of each pixel P.

[0082] The wavelength conversion layer 150 according to the embodiment may include a color filter that transmits only the wavelength corresponding to the color of the light emitted (or extracted) from the light-emitting unit EP toward the substrate 100. For example, the wavelength conversion layer 150 may transmit only red, green, or blue wavelengths. When a unit pixel includes adjacent first to fourth pixels P, the wavelength conversion layer disposed at the first pixel may include a red color filter, the wavelength conversion layer disposed at the second pixel may include a green color filter, and the wavelength conversion layer disposed at the third pixel may include a blue color filter. The fourth pixel may not include a wavelength conversion layer or may include a transparent material to compensate for the step difference between adjacent pixels, thereby emitting white light.

[0083] According to another embodiment, the wavelength conversion layer 150 may include quantum dots to emit light of a color set in a pixel P corresponding to the blue light emitted from the light-emitting portion EP toward the substrate 100. Optionally, according to another embodiment, the wavelength conversion layer 150 may be implemented using a sheet (or film) including a quantum dot layer overlapping the emission regions EA of a plurality of pixels P, and may be attached to a light extraction surface.

[0084] The light-emitting display device according to embodiments of this disclosure may further include a dam layer 190 and an encapsulation layer 200.

[0085] The dam layer 190 (or dam pattern) can define an emission region EA within the pixel region PA and can be disposed at the edge of the planarization layer 170 and the first electrode E1. The dam layer 190 can overlap with the edge of the wavelength conversion layer 150. The dam layer 190 can be formed of an organic material such as benzocyclobutene (BCB)-based resin, acrylic resin, polyimide resin, etc. For example, 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.

[0086] According to the embodiment, the dam layer 190 can be disposed above the upper surface 170a of the planarization layer 170 to cover (or superimpose) the edge of the circuit region CA of the first electrode E1 extending to the pixel region PA, and can be configured to cover (or superimpose) the edge of the light extraction pattern 180. In the two-dimensional structure, the size of the emission region EA defined by the dam layer 190 can be smaller than the size of the light extraction pattern 180 of the planarization layer 170. For example, the upper surface 170a of the planarization layer 170 that is in direct contact with the dam layer 190 can be referred to as a flat surface, a flat portion, etc. The flat surface 170a of the planarization layer 170 can surround the light extraction pattern 180 disposed in each pixel P.

[0087] The light-emitting device layer (EDL) can be disposed on the first electrode E1, the dam layer 190, and the step difference portion between the first electrode E1 and the dam layer 190. When the light-emitting device layer (EDL) is disposed with a small thickness at the step difference portion between the first electrode E1 and the dam layer 190, electrical contact (or short circuit) may occur between the second electrode E2 and the first electrode E1 due to the reduced thickness of the EDL. To prevent this problem, one end 191 of the dam layer 190 can be configured to cover (or overlap) the edge of the light extraction pattern 180 to reduce the step difference between the first electrode E1 and the dam layer 190, thereby preventing electrical contact (or short circuit) between the anode electrode E1 and the cathode electrode E2. For example, one end 191 of the dam layer 190 can be disposed between the upper surface 170a of the planarization layer 170 and the bottom surface of the outermost recess 181 of the light extraction pattern 180.

[0088] Each of the light-emitting device layer EDL of the light-emitting part EP and the second electrode E2 can be further disposed on the embankment layer 190. That is, the light-emitting part EP can be configured to cover (or superimpose) the first electrode E1 and the embankment layer 190, and the second electrode E2 can be formed to cover (or superimpose) the light-emitting device layer EDL.

[0089] The encapsulation layer 200 can be formed over the substrate 100 to cover (or superimpose) the second electrode E2. For example, the encapsulation layer 200 can be disposed between the substrate 100 and the opposing substrate 300 and can surround the display area. The encapsulation layer 200 can be used to protect the thin-film transistor and the light-emitting part EP from external impacts and to prevent oxygen and / or water and particles from penetrating into the light-emitting part EP.

[0090] The encapsulation layer 200 according to the embodiment may include a plurality of inorganic encapsulation layers. The encapsulation layer 200 may also include at least one organic encapsulation layer disposed between the plurality of inorganic encapsulation layers.

[0091] According to another embodiment, the encapsulation layer 200 may further include a filler that completely surrounds the display area. In this case, the opposing substrate 300 can be bonded to the substrate 100 by using the filler.

[0092] Figure 4 It is shown Figure 2 A plan view of the light extraction pattern shown, and Figure 5 yes Figure 4 An enlarged view of part "B" shown.

[0093] Reference Figures 3 to 5 The light extraction pattern 180 according to this disclosure includes a plurality of recesses 181 and protrusions 183.

[0094] Each of the plurality of recesses 181 according to this disclosure can be arranged parallel to a first direction X with a predetermined interval, and can be arranged alternately along a second direction Y intersecting the first direction X. As an embodiment, the center portion of each of the plurality of recesses 181 arranged along the first direction X can be positioned or aligned on a straight line SL parallel to the first direction X. Furthermore, the center portion of each of the plurality of recesses 181 arranged along the second direction Y can be positioned or aligned on a serrated line ZL having a serrated shape along the second direction Y. As another embodiment, each of the plurality of recesses 181 arranged on an even-numbered horizontal line parallel to the first direction X can be arranged between a plurality of recesses 181 arranged along the second direction Y at adjacent odd-numbered horizontal lines. Therefore, the light extraction pattern 180 can include a larger number of recesses 181 per unit area, thereby improving the external extraction efficiency of light emitted from the light-emitting portion EP.

[0095] According to the embodiment, the center portion of each of three adjacent recesses 181 can form a triangular shape (TS). Furthermore, the center portion of each of six recesses 181 arranged around or surrounding a recess 181 can have a hexagonal shape (HS). For example, each of the plurality of recesses 181 can be arranged or configured as a honeycomb structure or a circular structure.

[0096] According to embodiments of this disclosure, the spacing (or interval) D between the recesses 181 provided in each of the plurality of pixels P constituting a unit pixel can be the same or different. In this document, the spacing between the recesses 181 can be the interval (or distance) between the centers of two adjacent recesses 181. For example, the spacing D between the recesses 181 provided in each of the red, green, and blue pixels constituting a unit pixel can be the same or different. For example, the spacing D between the recesses 181 provided in the green pixel can be different from the spacing between the recesses 181 provided in the blue pixel. As another example, the spacing D between the recesses 181 provided in each of the red, green, blue, and white pixels constituting a unit pixel can be the same or different. For example, the spacing D between the recesses 181 provided in each of the white and / or green pixels can be different from the spacing D between the recesses 181 provided in the red and / or blue pixels.

[0097] According to embodiments of this disclosure, the distance (or interval) D between two adjacent recesses 181 can range from 4.2 μm to 4.9 μm (4.2 μm ≤ D ≤ 4.9 μm), but is not limited thereto. For example, the distance (or interval) D between two adjacent recesses 181 can range from 4.2 μm to 4.8 μm (4.2 μm ≤ D ≤ 4.8 μm), but is not limited thereto.

[0098] The protrusion 183 can be disposed in the planarization layer 170 overlapping with the emission region EA, having a shape that maximizes the external extraction efficiency of light emitted from pixel P based on the effective emission region of the light-emitting part EP. The protrusion 183 can change the travel path of light emitted from the light-emitting part EP to a path toward the substrate 100, and can illuminate the substrate 100 with light that is totally internally reflected in the light-emitting part EP, thereby reducing or preventing a decrease in or minimizing the light extraction efficiency of light trapped in the light-emitting part EP.

[0099] The protrusion 183 can be implemented individually surrounding each of the plurality of recesses 181. Therefore, the planarization layer 170 overlapping the emission region EA can include a plurality of recesses 181 surrounded by the protrusions 183. The protrusion 183 surrounding a recess 181 can have a hexagonal shape (or honeycomb shape) in one dimension.

[0100] The protrusion 183 according to an embodiment of the present disclosure may include a bottom (or bottom surface) 183a, a top (or top surface) 183b above the bottom 183a, and an inclined portion 183c between the bottom 183a and the top 183b.

[0101] The bottom 183a of the protrusion 183 can be the bottom surface 181a of the recess 181. For example, the bottom 183a of the protrusion 183 and the bottom surface 181a of the recess 181 can be provided on the same plane.

[0102] The top 183b of the protrusion 183 may be disposed on the same plane as the top surface 170a of the planarization layer 170, or it may be disposed between the top surface 170a of the planarization layer 170 and the substrate 100. For example, the distance between the top 183b of the protrusion 183 and the substrate 100 may be less than or equal to the distance between the top surface 170a of the planarization layer 170 and the substrate 100.

[0103] The top 183b of the protrusion 183 may have a convex curved shape. For example, the top 183b of the protrusion 183 may include a dome or bell-shaped structure with a convex cross-sectional shape, but is not limited thereto.

[0104] The inclined portion 183c of the protrusion 183 may have a curved shape between its bottom and top. The inclined portion 183c of the protrusion 183 may form or realize a recess 181. For example, the inclined portion 183c of the protrusion 183 may be an inclined surface or a curved portion.

[0105] According to embodiments of the present disclosure, the inclined portion 183c of the protrusion 183 may have a cross-sectional structure with a Gaussian curve. In this case, the inclined portion 183c of the protrusion 183 may have a tangent slope that gradually increases and then gradually decreases from the bottom to the top. Here, the tangent slope can be defined as the angle between the inclined portion and a horizontal line parallel to the bottom surface of the protrusion 183. According to embodiments of the present disclosure, the maximum tangent slope of the inclined portion 183c may be set in the half-height region of each protrusion 183, or it may be set between the half-height region and the top. Therefore, the inclined portion 183c of the protrusion 183 may include an inflection point set in the half-height region or set between the half-height region and the top. For example, the tangent slope of the inclined portion 183c may gradually increase from the bottom to the inflection point, and then gradually decrease from the inflection point to the top.

[0106] The protrusion 183 according to the embodiments of this disclosure may also include a plurality of peaks 183d and a plurality of ridges 183e.

[0107] Each of the plurality of peaks 183d may be disposed between three adjacent recesses 181. Each of the plurality of peaks 183d may be the central portion between the three adjacent recesses 181. Each of the plurality of peaks 183d may be the portion where the tops of the protrusions 183 surrounding each of the three adjacent recesses 181 contact each other. For example, each of the plurality of peaks 183d may be the highest point in the light extraction pattern 180. Therefore, each of the plurality of peaks 183d may be referred to as the highest point, peak, triple point, multi-point, or triple-point.

[0108] Each of the plurality of ridges 183e may be disposed or connected between two adjacent peaks 183d or between two adjacent recesses 181. Each of the plurality of ridges 183e may be a protrusion 183 disposed on top of two adjacent peaks 183d. Therefore, each of the plurality of peaks 183d may be a portion where three adjacent ridges 183e are connected to each other. The peaks 183d near the recesses 181 and the six ridges 183e may form a hexagonal shape HS in one dimension. For example, each of the plurality of ridges 183e may be referred to as a connecting portion or peak connecting portion.

[0109] Each of the plurality of ridges 183e may have a concave curvature between two adjacent peaks 183d. For example, each of the plurality of ridges 183e may have a tangent slope that gradually increases and then gradually decreases from the center (or the bottom of the ridge) between the two adjacent peaks 183d to the two adjacent peaks 183d.

[0110] As described above, in the light-emitting display device according to the embodiments of the present disclosure, the path of light emitted from the light-emitting portion EP can be changed by a light extraction pattern 180 including a protrusion 183 and a recess 181 provided in the emission region EA of the pixel, thereby improving light extraction efficiency, thereby increasing brightness and reducing power consumption.

[0111] In the light-emitting display device according to embodiments of the present disclosure, the recesses 181 of the light extraction pattern 180 may have a specific curvature based on the shape of the protrusions 183, and the curvature of each recess 181 may affect the light extraction efficiency of the pixel from which light emitted from the light-emitting portion EP is extracted to the outside. For example, the light extraction efficiency of the pixel may be affected by the tangent slope of the inclined portion of the protrusion 183. The curvature of each recess 181 may correspond to the inclined portion of the protrusion 183, and therefore, the tangent slope of the inclined portion may affect the curvature of each recess 181. Therefore, the curvature of each recess 181 provided in the light extraction pattern 180 may be a factor for determining the emission efficiency, light extraction efficiency, and current efficiency increase rate of the pixel (or light-emitting display device).

[0112] Figure 6It is along Figure 4 The cross-sectional view shown is taken by line I-I' and is a diagram used to describe the curvature of the recess according to an embodiment of the present disclosure.

[0113] Reference Figures 4 to 6 In the light extraction pattern 180 according to an embodiment of the present disclosure, each of the plurality of recesses 181 may be formed or realized by an inclined portion having a curved shape of the protrusion 183, and thus may have a spherical shape. Each of the plurality of recesses 181 may correspond to a spherical shape having a radius greater than half a distance (D / 2) between two adjacent recesses 181. For example, each of the plurality of recesses 181 may have a spherical shape smaller than a hemisphere, but is not limited thereto.

[0114] Each of the plurality of recesses 181 may be surrounded by six peaks 183d. For example, the six peaks 183d may be disposed near a recess 181. In the following description, the six peaks 183d surrounding a recess 181 or disposed near a recess 181 may be referred to as "peaks 183d near the recess 181".

[0115] The peak 183d near the recess 181 can be formed into a circular shape in one dimension, but it can be arranged in a first circular trajectory (or first circumference) CF1. The first circular trajectory CF1 can have a circular shape that passes through the peak 183d near the recess 181. For example, the first circular trajectory CF1 can have a circular shape that passes through the origin corresponding to the center portion CP1 between the peak 183d and the recess 181 and has a radius corresponding to the distance between the recess 181 and the peak 183d. The center portion CP1 of the first circular trajectory CF1 can be located or aligned at the center of the recess 181.

[0116] According to embodiments of this disclosure, in the protrusion 183, a first circular trajectory CF1 passing through a peak 183d near the recess 181 can contact a second circular trajectory CF2 having a spherical shape corresponding to the recess 181, or it can be an inscribed circle having a spherical shape corresponding to the recess 181. For example, the second circular trajectory CF2 can have a circular shape that passes through the origin corresponding to the center of each peak 183d near the recess 181 and has a radius "R" greater than that of the first circular trajectory CF1. Therefore, the center of the bottom surface 181a of the recess 181, the center CP1 of the first circular trajectory CF1, and the center CP2 of the second circular trajectory CF2 can be disposed or aligned on a vertical line VL parallel to the thickness direction Z of the substrate.

[0117] The center portion CP1 of the first circular trajectory CF1 can be located below the center portion CP2 of the second circular trajectory CF2. The center portion CP1 of the first circular trajectory CF1 can be spaced apart from the center portion of the bottom surface 181a of the recess 181 by a first distance "α", and can be spaced apart from the center portion CP2 of the second circular trajectory CF2 by a second distance "R-α". According to an embodiment of the present disclosure, when the distance "D" between two adjacent recesses 181 is 4.2 μm to 4.8 μm, the first distance "α" can have a range of 0.925 μm to 1.104 μm (0.925 μm ≤ α ≤ 1.104 μm). The second distance "R-α" can have a value obtained by subtracting the first distance "α" from the radius "R" of the second circular trajectory CF2.

[0118] The plurality of recesses 181 according to embodiments of the present disclosure may each have a specific curvature based on a spherical shape, but are not limited thereto, and may have the same curvature or different curvatures within the range of manufacturing tolerances. For example, the curvature of each of the plurality of recesses 181 may correspond to the curvature of a spherical shape having a second circular trajectory CF2, and the curvature of the spherical shape having the second circular trajectory CF2 may be calculated based on a first circular trajectory CF1.

[0119] In each of the plurality of recesses 181 according to embodiments of the present disclosure, when the distance “D” between two adjacent recesses 181 is 4.2 μm to 4.8 μm, the curvature “1 / R” of each of the plurality of recesses 181 can be 0.217 μm. -1 Up to 0.311μm -1 The range (0.217μm) -1 ≤1 / R≤0.311μm -1 For example, the curvature of each of the plurality of recesses 181 can be calculated on the X-axis and Y-axis planes based on the equation of a sphere passing through the center CP1 (or origin) of the first circular trajectory CF1 and having a radius "R".

[0120] Figure 7 It is shown Figure 4 The diagram shows a plan view of a recess and six peaks, and is used to describe the calculation of the curvature of the recess according to an embodiment of the present disclosure.

[0121] Reference Figures 4 to 7 The curvature of each of the plurality of recesses 181 can be calculated based on the equations for a sphere, as shown in the following equation.

[0122] [Equation]

[0123] x 2 +y 2 +(R-α) 2 =R2

[0124] 2αR=x 2 +y 2 +α 2

[0125]

[0126]

[0127] In the equation, x can represent the half-distance between two adjacent recesses 181, "x = D / 2". For example, x can represent the distance between the center of the recess 181 and one side of the hexagon in which each peak 183d near the recess 181 is a vertex, or it can represent the distance between the center of the recess 181 and the straight line within the shortest distance between two adjacent peaks 183d.

[0128] In the equation, y can represent the length of half the length of one side of the hexagon where each peak 183d near the concave portion 181 is a vertex, or it can represent half the shortest distance between two adjacent peaks 183d. For example, according to the triangle equation, y can correspond to the height of the triangle, and therefore can be represented as the value obtained by dividing x by the square root 3. Furthermore, R can represent the radius of the sphere shape corresponding to the recess 181.

[0129] In the equation, α can represent the distance between the bottom surface 181a of the recess 181 and the center CP1 of the first circular trajectory CF1 passing through the peak 183d near the recess 181. For example, α can represent the average height of the six peaks 183d located near the recess 181 from the bottom surface 181a of the recess 181.

[0130] In the equation, each of x, y, and α can be calculated or measured based on the planar and cross-sectional structures of the light extraction pattern 180. Therefore, the radius "R" of the sphere shape corresponding to the recess 181 can be calculated by substituting each of x, y, and α calculated based on the planar and cross-sectional structures of the light extraction pattern 180 into the equation. Furthermore, the curvature "1 / R" of each recess 181 can be calculated by taking the reciprocal "1 / R" of the radius "R" of the sphere shape corresponding to the recess 181.

[0131] Additionally, the distance "k" between the center of the recess 181 and the peak 183d near the recess 181, or the radius "k" of the first circular trajectory CF1 passing through the peak 183d near the recess 181, can be "x". 2 +y 2 The root value of " Therefore, in the equation, "x" 2 +y2 The value of “ can be replaced by the distance “k” between the center of the concave portion 181 and the peak portion 183d near the concave portion 181.

[0132] According to embodiments of this disclosure, in order to improve the light extraction efficiency of a pixel, the half-pitch between two adjacent recesses 181 can be set to a range of 2.1 μm to 2.4 μm, wherein the length "y" of each of the peaks 183d near the recess 181, which is half the length of one side of the hexagon of the vertex, can be set to a range of 1.212 μm to 1.386 μm, the average height "α" of the six peaks 183d near the recess 181 from the bottom surface 181a of the recess 181 can be set to a range of 0.925 μm to 1.104 μm, and the curvature "1 / R" of the recess 181 can be set to 0.217 μm. -1 Up to 0.311μm -1 The range.

[0133] Figure 8 It is a graph showing the increase rate of current efficiency of a pixel in a light-emitting display device according to an embodiment of the present disclosure relative to the spacing between two adjacent recesses, and shows the increase rate of current efficiency of a pixel relative to the current efficiency of a general pixel excluding a light extraction pattern.

[0134] Reference Figure 4 and Figure 8 In the pixels of the light-emitting display device according to embodiments of the present disclosure, when the distance "D" between two adjacent recesses 181 is in the range of 4 μm to 5 μm (4 μm ≤ D ≤ 5 μm), it can be seen that the current efficiency increase rate is improved by about 5% or more compared to a general pixel. For example, in the pixels of the light-emitting display device according to embodiments of the present disclosure, when the distance "D" between two adjacent recesses 181 is in the range of 4.1 μm to 4.9 μm (4.1 μm ≤ D ≤ 4.9 μm), it can be seen that the current efficiency increase rate is improved by about 10% or more compared to a general pixel. Furthermore, in the pixels of the light-emitting display device according to embodiments of the present disclosure, when the distance "D" between two adjacent recesses 181 is in the range of 4.2 μm to 4.8 μm (4.2 μm ≤ D ≤ 4.8 μm), it can be seen that the current efficiency increase rate is improved by about 15% or more compared to a general pixel. Based on the coefficient of determination "R2" of the quadratic equation obtained by performing a linear regression analysis on the current efficiency increase rate of the spacing "D" between two adjacent recesses 181, it can be seen that the current efficiency increase rate of the spacing "D" between two adjacent recesses 181 has a matching degree of approximately 45%.

[0135] Figure 9This is a graph showing the increase rate of current efficiency of a pixel in a light-emitting display device according to an embodiment of the present disclosure relative to the curvature of the recess, and showing the increase rate of current efficiency of a pixel relative to the current efficiency of a general pixel excluding the light extraction pattern when the half-pitch between two adjacent recesses 181 is 2.3 μm.

[0136] Reference Figure 6 and Figure 9 In the pixels of the light-emitting display device according to embodiments of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.3 μm and the curvature "1 / R" of the recesses 181 is 0.230 μm... -1 Up to 0.270μm -1 The range (0.230μm) -1 ≤1 / R≤0.270μm -1 When the current efficiency is increased, it can be seen that the current efficiency increase rate is improved by about 10% or more compared to a typical pixel. In the pixel of the light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.3 μm and the curvature "1 / R" of the recesses 181 is 0.234 μm... -1 Up to 0.267μm -1 The range (0.234μm) -1 ≤1 / R≤0.267μm -1 When the current efficiency is increased, it can be seen that the current efficiency increase rate is improved by about 15% or more compared to that of a normal pixel. According to the coefficient of determination "R2" of the quadratic equation based on the current efficiency increase rate of the curvature "1 / R" of the recess 181, it can be seen that the current efficiency increase rate of the curvature "1 / R" of the recess 181 has a matching degree of about 89%.

[0137] As another example, in the pixels of a light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.1 μm and the curvature "1 / R" of the recesses 181 is 0.275 μm... -1 Up to 0.311μm -1 The range (0.275μm) -1 ≤1 / R≤0.311μm -1 When the current efficiency is increased, it can be seen that the current efficiency is increased by about 10% or more compared to that of a typical pixel.

[0138] As another example, in the pixels of a light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.15 μm and the curvature "1 / R" of the recesses 181 is 0.264 μm... -1 Up to 0.299μm -1 The range (0.264μm)-1 ≤1 / R≤0.299μm -1 When the current efficiency is increased, it can be seen that the current efficiency is increased by about 10% or more compared to that of a typical pixel.

[0139] As another example, in the pixels of a light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.2 μm and the curvature "1 / R" of the recesses 181 is 0.253 μm... -1 Up to 0.288μm -1 The range (0.253μm) -1 ≤1 / R≤0.288μm -1 When the current efficiency is increased, it can be seen that the current efficiency is increased by about 10% or more compared to that of a typical pixel.

[0140] As another example, in the pixels of a light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.25 μm and the curvature "1 / R" of the recesses 181 is 0.243 μm... -1 Up to 0.277μm -1 The range (0.243μm) -1 ≤1 / R≤0.277μm -1 When the current efficiency is increased, it can be seen that the current efficiency is increased by about 10% or more compared to that of a typical pixel.

[0141] As another example, in the pixels of a light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.35 μm and the curvature "1 / R" of the recesses 181 is 0.225 μm... -1 Up to 0.257μm -1 The range (0.225μm) -1 ≤1 / R≤0.257μm -1 When the current efficiency is increased, it can be seen that the current efficiency is increased by about 10% or more compared to that of a typical pixel.

[0142] As another example, in the pixels of a light-emitting display device according to an embodiment of the present disclosure, when the half-pitch between two adjacent recesses 181 is 2.40 μm and the curvature "1 / R" of the recesses 181 is 0.217 μm... -1 Up to 0.248μm -1 The range (0.217μm) -1 ≤1 / R≤0.248μm -1 When the current efficiency is increased, it can be seen that the current efficiency is increased by about 10% or more compared to that of a typical pixel.

[0143] It can be seen that the curvature "1 / R" of the recess 181 according to the embodiments of the present disclosure is sufficient to represent the light extraction efficiency of the light-emitting display device.

[0144] Therefore, in the light-emitting display device according to the embodiments of the present disclosure, at least one of the recesses 181 of the light extraction pattern provided in the opening portion of each pixel can have a diameter of 0.217 μm. -1 Up to 0.311μm -1 The curvature of the light source can be adjusted, thereby increasing the rate of increase in pixel emission efficiency, light extraction efficiency, and current efficiency. This improves the light extraction efficiency of light emitted from the light-emitting portion of each pixel, resulting in increased brightness and reduced power consumption.

[0145] The light-emitting display device according to the embodiments of this disclosure can be applied to a variety of applications. The light-emitting display device according to the embodiments of this disclosure can be applied to mobile devices, video phones, smartwatches, watch phones, wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, bending devices, electronic organizers, e-books, portable multimedia players (PMPs), personal digital assistants (PDAs), MP3 players, mobile medical devices, desktop personal computers (PCs), laptop PCs, netbooks, workstations, navigation devices, car navigation devices, car display devices, TVs, wallpaper display devices, signage devices, game consoles, laptops, monitors, cameras, camcorders, home appliances, etc.

[0146] A light-emitting display device according to any of these aspects may include one or more of the following features:

[0147] According to one aspect, a light-emitting display device includes: a substrate including a plurality of pixels, each pixel including an emitting region; a light extraction pattern disposed in the emitting region and having an undulating surface; and a light-emitting portion disposed in the emitting region on the light extraction pattern. The light extraction pattern may include a plurality of recesses (or depressions) forming the undulating surface. The light extraction pattern may include a protrusion or convexity surrounding each recess (e.g., one). At least one or each of the plurality of recesses may have a diameter of 0.217 μm. -1 Up to 0.311μm -1 The curvature.

[0148] According to another aspect, a light-emitting display device includes: a substrate including a plurality of pixels, each pixel including an emitting region; a planarization layer disposed on the substrate and including a light extraction pattern in the emitting region, the light extraction pattern having an undulating surface; and a light-emitting portion disposed in the emitting region, the light-emitting portion including a first electrode disposed on the light extraction pattern, a light-emitting device layer disposed on the first electrode, and a second electrode disposed on the light-emitting device layer. The light extraction pattern may include a plurality of recesses (or depressions) forming the undulating surface. The recesses (or depressions) may be spaced apart from each other. The light extraction pattern may include protrusions or convexities surrounding each of the recesses. At least one or each of the plurality of recesses may have a diameter of 0.217 μm. -1 Up to 0.311μm -1 The curvature.

[0149] The light-emitting display device can be bottom-emitting, top-emitting, or both bottom- and top-emitting. Each pixel can include an emitting region. Each pixel can also include a circuit region surrounding the emitting region.

[0150] The light extraction pattern can be formed on the upper surface of a planarization layer disposed on a substrate. That is, the upper surface of the planarization layer (i.e., the surface on which the light-emitting part is disposed) can have an undulating shape. The undulating surface or shape can also be represented as an uneven, corrugated, wavy, or rippled surface or shape.

[0151] The light-emitting portion can be disposed on the light extraction pattern to have a corresponding undulating surface. That is, the light-emitting portion can have an upper and / or lower surface including a plurality of recesses (or depressions) forming the undulating surface. The light-emitting portion can include a protrusion or convexity surrounding each of the recesses. The light-emitting portion can be directly disposed on the light extraction pattern, i.e., it can be disposed in contact with the light extraction pattern. The light-emitting portion can include a first electrode, a light-emitting device layer disposed on the first electrode, and a second electrode disposed on the light-emitting device layer. The light-emitting portion can be configured to emit light.

[0152] In this disclosure, the surface of the substrate facing the light-emitting portion (i.e., the substrate on which the light-emitting portion is disposed) can be represented as the upper surface of the substrate. The surface of a layer or element facing away from the substrate and / or towards the light-emitting portion can be represented as its upper surface. The surface of a layer or element facing away from the substrate and / or away from the light-emitting portion can be represented as its lower surface. Thickness can refer to the dimension in a direction perpendicular to the surface of the corresponding element or layer of the light-emitting display device and / or the substrate and / or surface (e.g., the light-emitting surface). Similarly, height can refer to the distance in a direction perpendicular to the surface of the substrate of the light-emitting display device and / or the surface (e.g., the light-emitting surface). Surface region can refer to the region of a surface parallel to the surface of the substrate of the light-emitting display device and / or the surface (e.g., the light-emitting surface).

[0153] In this disclosure, curvature can be defined as the reciprocal of the radius of curvature. In particular, the curvature of a concave portion can be defined as the curvature of the concave portion at its center point.

[0154] The distance between the center points (also referred to as the center) of two adjacent recesses can be from 4.2 μm to 4.8 μm.

[0155] The light extraction pattern may also include protrusions surrounding each of the multiple recesses. The protrusions may have a grid shape or a honeycomb shape.

[0156] The light-emitting part may include a first electrode, a light-emitting device layer, and a second electrode. The first electrode may be disposed on the light extraction pattern.

[0157] The first electrode can be formed conformally with respect to the non-planar portion. The light-emitting device layer can be formed non-conformally with respect to the first electrode. The first electrode and / or the second electrode can be formed with a uniform thickness. The light-emitting device layer can be formed with a non-uniform or varying thickness.

[0158] The deepest point of the recess can correspond to its center point or center portion. The center point of the recess can be located on a plane, particularly on a plane parallel to the surface of the substrate.

[0159] The light-emitting display device may further include a wavelength conversion layer disposed between the substrate and the light extraction pattern. The wavelength conversion layer may be disposed in the emission region. The wavelength conversion layer may be configured to change the wavelength of light passing through it. The wavelength conversion layer may include a color filter.

[0160] The area where the light extraction pattern is arranged can be wider than the emission area. That is, the surface area of ​​the light extraction pattern can be larger than the emission area. The light extraction pattern can extend into the circuit area.

[0161] Each of the plurality of recesses can be arranged in parallel with a predetermined interval along a first direction. Each of the plurality of recesses can be arranged alternately along a second direction intersecting the first direction. The recesses can be arranged in parallel along multiple lines extending in the first direction. The center points of adjacent recesses arranged on a line can be spaced apart at predetermined intervals. One or each of the plurality of recesses can be surrounded by six other recesses. The plurality of recesses can be arranged to tile the launch area in a hexagonal or triangular pattern or to tile the launch area.

[0162] The protrusion may include multiple peaks positioned between three adjacent recesses (i.e., positioned at the center of a triangle formed by the center points of the three adjacent recesses, or at the centroid of the triangle). The protrusion may also include multiple ridges formed between two adjacent recesses. That is, a line connecting the center points of two adjacent recesses may intersect a ridge, for example, it may intersect the ridge perpendicularly. The protrusion may include multiple ridges between two adjacent recesses, the multiple ridges connecting (or linking) two adjacent peaks.

[0163] The average height between a peak located near a recess and the bottom surface (or deepest point or center point) of the recess can be from 0.925 μm to 1.104 μm. That is, the height of a peak (e.g., each peak) relative to the center point (or bottom surface or deepest point) of an adjacent recess can be in the range of 0.925 μm to 1.104 μm.

[0164] The distance between the center point or central portion of a concave portion and the shortest distance between two adjacent peaks can be from 1.212 μm to 1.386 μm. The distance between the center point of a concave portion and the (straight) line connecting two peaks can also be from 1.212 μm to 1.386 μm. Here, the two peaks can be adjacent to or closest to each other, and can also be adjacent to or closest to the concave portion.

[0165] Six peaks, positioned close to a recess, and six ridges connecting the six peaks have a hexagonal shape in one dimension. That is, the six peaks can be arranged in a hexagonal shape surrounding a recess. Alternatively or additionally, the six ridges can be hexagonally connected to the six peaks adjacent to a recess. Here, the hexagonal shape can be understood as a shape in a planar view when viewed from above. Therefore, the hexagonal shape can refer to a shape in a plane parallel to the substrate and / or light-emitting surface of the light-emitting display device.

[0166] The origin of the circular trajectory passing through six peaks located near a concave portion among multiple peaks can be set below the origin of a spherical shape corresponding to the curvature of the concave portion. The height of each peak can be less than the radius of curvature of the adjacent concave portion.

[0167] Each of the plurality of ridges may be situated between two adjacent recesses and / or may be formed in a concave, curved shape between two adjacent peaks (e.g., recessed along a line connecting two adjacent peaks). Each ridge may connect two adjacent peaks. Each ridge may have a curved (particularly concave) shape. The line connecting two adjacent recesses may intersect the ridge, for example, at the lowest point of the ridge and / or at the center of the ridge, i.e., the line may cut the ridge located between the recesses in half.

[0168] It will be apparent to those skilled in the art that various modifications and variations can be made to the light-emitting display device of this disclosure without departing from the spirit or scope of this disclosure. Therefore, this disclosure is intended to cover modifications and variations thereof, provided that such modifications and variations fall within the scope of the appended claims and their equivalents.

Claims

1. A light-emitting display device, comprising: A substrate comprising a plurality of pixels configured to include emission regions; A light extraction pattern is configured to include a plurality of recesses disposed in the emission region; as well as The light-emitting part is disposed above the light extraction pattern. At least one of the plurality of recesses has a diameter of 0.217 μm. -1 Up to 0.311μm -1 curvature, The distance between the center of two adjacent recesses is 4μm to 5μm.

2. The light-emitting display device according to claim 1, wherein, The distance between the center of two adjacent recesses is 4.2 μm to 4.8 μm.

3. The light-emitting display device according to claim 1, wherein, The light extraction pattern also includes a protrusion surrounding each of the plurality of recesses.

4. A light-emitting display device, comprising: A substrate comprising a plurality of pixels configured to include emission regions; A planarization layer is disposed in the emission region and configured to include a light extraction pattern, the light extraction pattern including a plurality of recesses spaced apart from each other and a protrusion surrounding each of the plurality of recesses; A first electrode is disposed above the light extraction pattern; A light-emitting device layer disposed above the first electrode; as well as The second electrode is disposed above the light-emitting device layer. At least one of the plurality of recesses has a diameter of 0.217 μm. -1 Up to 0.311μm -1 curvature, The distance between the center of two adjacent recesses is 4μm to 5μm.

5. The light-emitting display device according to claim 4, in, The first electrode is formed conformally with respect to the non-planar portion, and The light-emitting device layer is formed non-conformal relative to the first electrode.

6. The light-emitting display device according to claim 4 further includes a wavelength conversion layer disposed between the substrate and the light extraction pattern.

7. The light-emitting display device according to claim 4, wherein, The distance between the center of two adjacent recesses is 4.2 μm to 4.8 μm.

8. The light-emitting display device according to any one of claims 1 to 7, wherein, The area where the light extraction pattern is arranged is wider than the emission area.

9. The light-emitting display device according to any one of claims 1 to 7, wherein, Each of the plurality of recesses is arranged parallel to each other along a first direction with a predetermined interval, and is arranged alternately along a second direction that intersects the first direction.

10. The light-emitting display device according to any one of claims 3 to 7, wherein, The protrusion includes: Multiple peaks respectively set between three adjacent concave portions; and Multiple ridges are provided between two adjacent recesses and / or connecting two adjacent peaks.

11. The light-emitting display device according to claim 10, wherein, The height of each of the peaks from the center point of the adjacent recess is between 0.925 μm and 1.104 μm.

12. The light-emitting display device according to claim 10, wherein, Half of the shortest distance between two adjacent peaks is 1.212 μm to 1.386 μm.

13. The light-emitting display device according to claim 10, wherein, The six ridges connecting the six adjacent peaks surround a concave area in a hexagonal shape.

14. The light-emitting display device according to claim 10, wherein, The height of each of the peaks from the center point of the adjacent concave portion is less than the radius of curvature at the center point of the adjacent concave portion.

15. The light-emitting display device according to claim 10, wherein, The line connecting the center points of two adjacent recesses intersects the ridge and / or the lowest point of the ridge and / or the center of the ridge.

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