Organic light-emitting display device

Abstract

Organic light-emitting display device (100), comprising: a substrate (101); a reflective electrode (150) in a pixel area (P) on the substrate (101) and with a concave section (151) that defines a concave trench (144); a first filling structure (155) that fills the concave trench (144); a first electrode (165) on the first filling structure (155) and on a section of the reflecting electrode (150) around the first filling structure (155); an organic light-emitting layer (167) on the first electrode (165); a second electrode (169) on the organic light-emitting layer (167); a bank (166) which is arranged in an edge section of the first electrode (165); a passivation layer (141) located below the reflecting electrode (150) and having a concave surface (141a) on which the concave section (151) of the reflecting electrode (150) is formed, wherein the passivation layer (141) has a drain contact hole (142) below the bench (166); a thin-film transistor (Td) arranged below the passivation layer (141) in the pixel area (P), wherein a drain electrode (133) of the thin-film transistor (Td) and an edge section of the reflecting electrode (150) are connected through the drain contact hole (142) below the bank (166); and a second filling structure (156) that fills the drain contact hole (142) in the edge section of the reflecting electrode (150), wherein the edge section of the first electrode (165) contacts an upper surface of the second filling structure (156) and an upper surface of the edge section of the reflecting electrode (150) around the second filling structure (156).

Description

BACKGROUND OF THE INVENTION Area of ​​the invention

[0001] The present invention relates to an organic light-emitting display device (OLED). Discussion of the related technology

[0002] Recently, flat display devices, which are excellent in their thin profile, light weight and low energy consumption, have been developed and widely used.

[0003] Among flat display devices, an organic light-emitting display device (OLED), also known as an organic electroluminescent display device, is a display device in which an electron from a cathode and a hole from an anode are injected into an emissive layer between the cathode and anode to create an electron-hole pair, and the electron-hole pair disappears to emit light.

[0004] In general, a top-emitter type OLED comprises a reflective electrode located beneath an organic light-emitting layer and in a flat state, and light emitted by the organic light-emitting layer and propagating downwards is reflected by the reflective electrode.

[0005] Light incident at a large angle to the reflecting electrode is emitted to an adjacent pixel area to create color mixing. Furthermore, within an organic light-emitting panel, the light is totally reflected and directed laterally to minimize light loss.

[0006] US 2017 / 0317148A1 discloses an organic electroluminescent device comprising a base material with an upper surface on which a recess is provided; a reflective layer provided along at least one surface of the recess; a filler layer that is inserted into the recess over the reflective layer, wherein the filler layer is transparent; a first electrode provided on at least one upper surface of the filler layer, wherein the first electrode is transparent; an organic layer provided on one upper surface of the first electrode, wherein the organic layer comprises at least one light-emitting layer; and a second electrode provided on one upper surface of the organic layer, wherein the second electrode is transparent, and wherein a color material is mixed into the filler layer.

[0007] WO 2017 / 043 529 A1 discloses an organic electroluminescent device comprising light-emitting elements equipped with a substrate provided with recesses, a reflective layer provided on the surface of the recesses, an optically transparent filler layer filling the interior of the recesses with the reflective layer arranged between them, an optically transparent first electrode provided on the filler layer, an organic layer provided on the first electrode including a light-emitting layer and an optically transparent second electrode provided on the organic layer; and active elements connected to the light-emitting elements.

[0008] WO 2017 / 094760A1 discloses an organic EL device equipped with a substrate, an insulating layer with a recessed section in an upper surface thereof and a light-emitting element.The light-emitting element is equipped with: a reflective layer provided at least on the surface of the recessed section; an optically transparent filler layer with which the interior of the recessed section is filled, with the reflective layer positioned between it; a first optically transparent electrode provided at least on one upper surface of the filler layer; an organic layer comprising at least one light-emitting layer and provided in the layer above the first electrode; a second optically transparent electrode provided on the upper surface of the organic layer; and an edge-covering layer covering an edge section of at least the first electrode. The organic EL device has several uniform light-emitting regions that are separated from one another. SUMMARY OF THE INVENTION

[0009] Organic light-emitting display devices according to claims 1 and 5 are provided. Further embodiments are described in the dependent claims.

[0010] Accordingly, the present invention relates to an organic light-emitting display device (OLED) which substantially eliminates one or more of the problems arising from limitations and disadvantages of the related technology.

[0011] One object of the present invention is to improve an OLED that can improve (or reduce) color mixing or light loss.

[0012] Additional features and advantages of the disclosure are set forth in the following description and are partly evident from the description itself or can be learned by carrying out the disclosure. The advantages of the disclosure are realized and achieved through the structure highlighted in the written description, the claims, and the accompanying drawings.

[0013] To achieve these and other advantages, and in accordance with the purpose of the present invention, as set forth and described in detail herein, an organic light-emitting display device according to claim 1 is provided. Further embodiments are described in the dependent claims. An organic light-emitting display device according to various embodiments comprises: a substrate; a reflective electrode in a pixel area on the substrate and having a concave section defining a concave trench; a first infill structure filling the concave trench; a first electrode on the first infill structure and on a section of the reflective electrode surrounding the first infill structure; an organic light-emitting layer on the first electrode; and a second electrode on the organic light-emitting layer.

[0014] An upper surface of the first filling structure can have the same height as an upper surface of the section of the reflecting electrode surrounding the first filling structure.

[0015] The organic light-emitting display device may further comprise: a passivation layer which may be located under the reflecting electrode, and may include a concave surface on which the concave section of the reflecting electrode may be formed.

[0016] The organic light-emitting display device may also include a thin-film transistor in the pixel area.

[0017] The organic light-emitting display device may further include: a second filling structure that fills a drain contact hole of the passivation layer.

[0018] A drain electrode of the thin-film transistor and the reflecting electrode can be connected through the drain contact hole.

[0019] The organic light-emitting layer can emit white light.

[0020] A color filter structure can be located on the second electrode.

[0021] The second electrode can be transparent or semi-transparent.

[0022] It is understood that both the preceding general description and the following detailed description are exemplary and explanatory and are intended to provide a further explanation of the claimed invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, included to facilitate a further understanding of the revelation and incorporated into this description as a part thereof, illustrate embodiments of the revelation and, together with the description, serve to explain the principles of the revelation. The drawings include: Fig. 1 is a top view schematically illustrating an OLED according to an embodiment of the present invention; Fig. 2 is a cross-sectional view along a line II-II of Fig. 1; Fig. Figure 3 is a cross-section showing a reflection of a two-layer structure according to an embodiment of the present invention; Fig. Figure 4 is a view illustrating a path of light reflected from a reflecting electrode according to an embodiment of the present invention; and Fig. Figure 5 is a view illustrating a simulation result of an output light profile of an OLED according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE ILLUSTRATED EXECUTION FORMS

[0024] The following section details embodiments, examples of which are illustrated in the accompanying drawings. The same or similar reference numerals may be used in all drawings to refer to the same or similar parts.

[0025] Fig. 1 is a top view schematically illustrating an OLED according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view along a line II-II of Fig. 1.

[0026] Referring to Fig. 1 In this embodiment, the OLED 100 comprises a plurality of pixel areas P in a display area for displaying images, and the plurality of pixel areas P are arranged in a matrix form.

[0027] The multitude of pixel areas P can include red (R), green (G), and blue (B) pixel areas P to display red, green, and blue colors, respectively. The red (R), green (G), and blue (B) pixel areas P can be arranged alternately along a single direction.

[0028] A structure of the OLED 100 is further described with reference to Fig. 2 explained in more detail.

[0029] The OLED 100 can include two substrates, i.e., a first substrate 101 and a second substrate 181 facing each other.

[0030] The first substrate 101 can be an array substrate and contains control elements to operate each pixel area P.

[0031] The second substrate 181 is a substrate opposite the first substrate 101. The second substrate 181 can serve as an encapsulation substrate for encapsulating the first substrate 101. Alternatively, the second substrate 181 can be omitted.

[0032] The OLED 100 can be a top-emitter type OLED.

[0033] In this respect, light is emitted upwards from the first substrate 101, so that an outer surface of the second substrate 181 serves as a display surface (or light output surface).

[0034] Although not shown in the drawings, a circular polarizing plate may be attached to the outer surface of the second substrate 181 to improve reflection of external light.

[0035] In each pixel area P of the first substrate 101, a switching thin-film transistor (TFT), a driver TFT Td and an organic light-emitting diode (OD) located on the switching TFT and the driver TFT Td and connected to the driver TFT Td are arranged.

[0036] More precisely, a semiconductor layer 112 can be formed on an inner surface of the first substrate 101. The semiconductor layer 112 can, for example, consist of polysilicon, but is not limited to this.

[0037] An insulating layer, for example a gate insulating layer 115, can be formed on the semiconductor layer 112. The gate insulating layer 115 can be formed completely over the first substrate 101.

[0038] The gate insulating layer 115 can be made of an inorganic insulating material, for example silicon oxide or silicon nitride.

[0039] A gate electrode 120 can be arranged on the gate insulating layer 115 and correspond to a central section of the semiconductor layer 112. The gate electrode 120 can be made of a conductive material, for example, a metal.

[0040] A gate line connected to a gate electrode of the switching TFT can be formed on the gate insulating layer 115.

[0041] An insulating layer, for example an interlayer insulating layer 125, can be formed on the gate electrode 120. The interlayer insulating layer 125 can be formed completely over the first substrate 101.

[0042] The intermediate insulating layer 125 can be made of an inorganic insulating material, for example silicon oxide or silicon nitride, or an organic insulating material, for example benzocyclobutene or photoacrylic.

[0043] The intermediate insulating layer 125 can contain a first contact hole 126a and a second contact hole 126b, each exposing both sides of the semiconductor layer 112.

[0044] The first and second contact holes 126a and 126b are located on both sides of the gate electrode 120 and are spaced apart from the gate electrode 120. The first and second contact holes 126a and 126b can also be formed in the gate insulating layer 115.

[0045] A source electrode 131 and a drain electrode 133 can be formed on the intermediate insulating layer 125. The source and drain electrodes 131 and 133 can be made of a conductive material, for example, a metal.

[0046] A data line can be formed on the intermediate insulating layer 125. The data line crosses the gate line and is connected to a source electrode of the switching TFT.

[0047] The source and drain electrodes 131 and 133 are spaced apart, with the gate electrode 120 between them. The source and drain electrodes 131 and 133 can each contact the two sides of the semiconductor layer 112 through the first and second contact holes 126a and 126b, respectively.

[0048] The semiconductor layer 112, the gate electrode 120 and the source and drain electrodes 131 and 133 form the driver TFT Td.

[0049] Alternatively, the driver TFT Td can have an inverted offset structure, in which a gate electrode is formed under a semiconductor layer and source and drain electrodes are formed on the semiconductor layer. In this case, the semiconductor layer can, for example, consist of amorphous silicon.

[0050] Although not shown in the drawings, the switching TFT can be designed to have the same structure as the driver TFT Td.

[0051] A first passivation layer 140, acting as an insulating layer, can be formed on the source and drain electrodes 131 and 133. The first passivation layer 140 can be formed completely over the first substrate 101.

[0052] The first passivation layer 140 can be made of an inorganic insulating material, for example silicon oxide or silicon nitride.

[0053] A second passivation layer 141, acting as an insulating layer, can be formed on top of the first passivation layer 140. The second passivation layer 141 can be formed entirely over the first substrate 101.

[0054] The second passivation layer 141 can be made of an organic insulating material, for example benzocyclobutene or photoacrylic.

[0055] The first and second passivation layers 140 and 141 can have a drain contact hole 142 that exposes the drain electrode 133.

[0056] Alternatively, a single-layer passivation structure can be applied to the driver TFT Td with the second passivation layer.

[0057] The second passivation layer 141 can contain a concave cavity in each pixel area P.

[0058] In this respect, a section of the second passivation layer 141, corresponding to a light emission region in which the organic light-emitting diode OD is formed in the pixel region P, has an upper surface 141a that is concavely curved downwards (i.e., in the direction of the first substrate 101). This concave surface 141a is referred to as the concave surface 141a.

[0059] A space in a recessed form on the concave surface 141a is the concave trench 144. Accordingly, the concave trench 144, defined by the concave surface 141a (i.e. surrounded by the concave surface 141a), can be provided in the second passivation layer 141.

[0060] A section of the second passivation layer 141 around (or surrounding) the concave trench 144 may have a flat (or level) state. In other words, the section of the second passivation layer 141 around the concave trench 144 may have a flat upper surface.

[0061] The second passivation layer 141 can be formed, for example, by a photolithography process using a halftone mask.

[0062] A reflective electrode 150 is formed on the second passivation layer 141 in each pixel area P.

[0063] The reflective electrode 150 can be connected to the drain electrode 133 via the drain contact hole 142.

[0064] A section of the reflective electrode 150, which is arranged in the drain contact hole 142, can extend along the inner surfaces of the drain contact hole 142 to contact the drain electrode 133.

[0065] The reflective electrode 150 can be formed according to the concave groove 144 of the second passivation layer 141.

[0066] Accordingly, a section of the reflecting electrode 150 formed in the concave trench 144 can have essentially the same shape as the concave surface 141a.

[0067] In other words, the section of the reflecting electrode 150 in the concave trench 144 can be formed along the concave surface 141a to have essentially the same shape as the concave surface 141a. This section of the reflecting electrode 150 in the concave trench 144 is referred to as the concave section 151.

[0068] Accordingly, the concave trench 144 of the second passivation layer 141 can remain on the concave section 151 of the reflecting electrode 150.

[0069] In other words, the reflecting electrode 150 can also have the concave groove 144, which is located on the concave section 151. That is, the concave section 151 of the reflecting electrode 150 can define the concave groove 144.

[0070] Furthermore, the reflecting electrode 150 can be formed on the flat surface of the section of the second passivation layer 141 surrounding the concave surface 141a. The section of the reflecting electrode 150 located on the flat surface of the section of the second passivation layer 141 surrounding the concave surface 141a is essentially flat.

[0071] The reflective electrode 150 can be made of a metallic material that has a high reflectivity, such as silver (Ag).

[0072] The reflective electrode 150 can have a single-layer or multi-layer structure.

[0073] In the case of the reflective electrode 150 with a multilayer structure, an upper layer of the reflective electrode 150 can be made of a metallic material with a reflectivity, and a lower layer of the reflective electrode 150 can be made of a conductive material with high adhesion properties, for example ITO.

[0074] In this respect, it shows Fig. 3 The reflective electrode 150 of a two-layer structure as an example of a multi-layer structure. This reflective electrode 150 can have a first layer 150a as a lower layer, which is formed from a transparent conductive material, for example ITO, and a second layer 150b as an upper layer, which is formed from a reflective metallic material, for example Ag.

[0075] A first filling structure 155 can be formed on the reflecting electrode 150. In detail, the first filling structure 155 can be arranged on the concave section 151 of the reflecting electrode 150 and cover the concave section 151.

[0076] The first filling structure 155 can be set up to completely fill the concave trench 144 in which the reflecting electrode 150 is formed.

[0077] Accordingly, in the state in which the first filling structure 155 is formed, the concave trench 144 and the surface of the first substrate 101 around the concave trench 144 can be essentially flat.

[0078] In other words, since the first filling structure 155 is designed to cover the concave section 151 and fill the concave trench 144, a flat top surface of the first filling structure 155 and a flat top surface of the reflecting electrode 150 around the first filling structure 155 can be of essentially the same height.

[0079] Furthermore, a second filling structure 156 can be formed on the reflecting electrode 150 in the drain contact hole 142 to fill the drain contact hole 142.

[0080] Accordingly, in the state in which the second filling structure 156 is formed, the drain contact hole 142 and the surface of the first substrate 101 around the drain contact hole 142 can be essentially flat.

[0081] In other words, since the second filling structure 156 is designed to fill the drain contact hole 142, a flat top surface of the second filling structure 156 and a flat top surface of the reflecting electrode 150 around the second filling structure 156 can be of essentially the same height.

[0082] The first and second filling structures 155 and 156 can be made of an organic insulating material, for example benzocyclobutene or photoacrylic.

[0083] A first electrode 165 can be formed in each pixel area P on the first substrate 101 with the first and second filling structures 155 and 156.

[0084] The first electrode 165 can be made of a transparent conductive material, for example ITO.

[0085] The first electrode 165 can contact the first filling structure 155 and the section of the reflective electrode 150 around the first filling structure 155.

[0086] When the first electrode 165 is formed to contact the upper surface of the section of the reflecting electrode 150 that is not covered by the first filler structure 155 (or exposed around the first filler structure 155), the first electrode 165 is able to be electrically connected to the drain electrode 133 through the reflecting electrode 150.

[0087] Furthermore, the first electrode 165 can contact the second filling structure 156 and the section of the reflective electrode 150 around the second filling structure 155.

[0088] As described above, since the first substrate 101 with the first and second filling structures 155 and 156 essentially has a flat surface, the first electrode 165 can be designed to be essentially flat.

[0089] A bank (or partition) 166 can be formed at the first electrode 165 along a boundary of each pixel area P and surround each pixel area P.

[0090] Bank 166 can have an opening that exposes the first electrode 165 in each pixel area P, and can cover an edge section of the first electrode 165.

[0091] In other words, the edge section of the first electrode 165 and an edge section of the reflecting electrode 150 can be arranged below the bank 166 so that they are covered by the bank 166, while the edge sections of the first electrode 165 and the reflecting electrode 150 can be left exposed so that they do not contact an organic light-emitting layer 167.

[0092] The bank 166 can be configured to shield (or cover) an edge section of the concave groove 144 of the reflecting electrode 150. In this respect, if the edge section of the concave groove 144 is not shielded by the bank 166 and is located on an inner surface of the bank 166, light may be bent towards an adjacent pixel area, causing color mixing.

[0093] The organic light-emitting layer 167 can be formed on the first electrode 165, which is exposed through the opening of the bench 166. The organic light-emitting layer 167 can have a multilayered structure containing an emitting material layer.

[0094] Since the first electrode 165 is essentially flat, the organic light-emitting layer 167 can be formed on the first electrode 165 in a flat state.

[0095] The organic light-emitting layer 167, which is formed in each of the red, green, and blue pixel regions P, can be a white organic light-emitting layer that emits a white color. Alternatively, the organic light-emitting layers 167, which are formed in the red, green, and blue pixel regions P respectively, can be red, green, and blue organic light-emitting layers that emit red, green, and blue colors, respectively.

[0096] In this embodiment, the organic light-emitting layer 167 uses, by way of example, a white organic light-emitting layer in each of the red, green and blue pixel areas P.

[0097] Alternatively, the organic light-emitting layer 167 can be formed across all pixel areas P. In other words, the organic light-emitting layer 167 can be continuous across all pixel areas P.

[0098] A second electrode 169 can be formed on the organic light-emitting layer 167 and completely above the first substrate 101.

[0099] The second electrode 169 can be configured as a permeable (or transparent) electrode. In this case, the second electrode 169 can be made of a transparent conductive material, for example ITO.

[0100] Alternatively, the second electrode 169 can be configured as a semi-transparent (or semi-semi-transparent) electrode. In this case, a microcavity effect can be achieved to increase the emission efficiency. The second electrode 169 can then be made of a metallic material, such as magnesium (Mg), silver (Ag), or an alloy of magnesium and silver, and this metallic material can be formed with a small thickness to achieve semi-transparent properties.

[0101] Since the organic light-emitting layer 167 is flat, a section of the second electrode 169 can be flat on the organic light-emitting layer 167.

[0102] The first electrode 165, the organic light-emitting layer 167 and the second electrode 169 form the organic light-emitting diode OD in the pixel area P. One of the first and second electrodes serves as an anode and the other as a cathode.

[0103] A third passivation layer 170 can be formed on the second electrode 169 and completely over the first substrate 101. The third passivation layer 170 can serve to prevent the ingress of external moisture or oxygen and to increase reliability.

[0104] The third passivation layer 170 can be made of an inorganic insulating material, for example silicon oxide or silicon nitride. Furthermore, the third passivation layer 170 can be configured to have a multilayer structure comprising at least one silicon oxide or silicon nitride.

[0105] The second substrate 181 can be located on the third passivation layer 170.

[0106] An adhesive layer 183 can be formed between an inner surface of the third passivation layer 170 and an inner surface of the second substrate 181.

[0107] A color filter layer 190 can be located on an outer surface of the second substrate 181 to implement a color of each pixel area P.

[0108] The color filter layer 190 can, for example, contain red, green and blue color filter structures 190r, 190g and 190b, each corresponding to the red, green and blue pixel areas P.

[0109] Accordingly, white light from the organic light-emitting diode OD, which emits white light, passes through each of the corresponding red, green and blue color filter structures 190r, 190g and 190b, so that red, green and blue color can be emitted respectively.

[0110] Furthermore, a black matrix 195 can be formed along a boundary of each pixel area P on the outer surface of the second substrate 181.

[0111] As described above, in this embodiment the reflecting electrode 150 with the concave structure is formed below the organic light-emitting diode OD in the light emission area.

[0112] Accordingly, the reflecting electrode 150 serves as a concave mirror and can thus emit incident light essentially vertically upwards.

[0113] This further refers to Fig. Figure 4, which is a view illustrating a path of light reflected from the reflecting electrode according to an embodiment of the present invention. Fig. For illustrative purposes, some components of the OLED 100 have been omitted from section 4.

[0114] Further with reference to Fig. 4 A light generated in the organic light-emitting layer 167 and moving downwards is reflected by the reflecting electrode 150.

[0115] The reflecting electrode 150 has a concave structure that is recessed downwards and thus serves as a concave mirror.

[0116] Thus, even if the angle of incidence θi of a light Li with respect to a normal direction to a surface of a substrate is large, the angle of reflection θr with respect to the normal direction will be small for the light Li due to the concave mirror function of the reflecting electrode 150.

[0117] Accordingly, light Lr reflected from the reflecting electrode 150 is concentrated and essentially emitted in a forward direction of the OLED 100.

[0118] Thus, since the reflected light Lr is essentially emitted within each pixel area P, color mixing due to light spreading into an adjacent pixel area can be prevented.

[0119] Since the angle of incidence θr of the reflected light Lr is small, light loss due to light being guided laterally by total internal reflection at an interface between stacked layers with different refractive indices can also be prevented (or reduced).

[0120] In this regard, for example, since the second electrode 169 has a refractive index that is greater than that of the third passivation layer 170, which is arranged on the second electrode 169, total internal reflection can occur in a case where the angle of incidence of a reflected light is similar to that in the technique referred to.

[0121] In this embodiment, however, the angle of incidence θr of the reflected light Lr becomes small due to the concave reflecting electrode 150. Therefore, light loss due to total internal reflection can be improved.

[0122] Furthermore, in this embodiment, the concave trench 144 with the reflecting electrode 150 therein is filled with the first filling structure 155, so that a surface of a substrate in the light emission area is essentially flat.

[0123] Accordingly, the organic light-emitting layer 167 has essentially a uniform thickness.

[0124] Therefore, a uniform electric field is applied to the entire organic light-emitting layer 167, and thus uniformity of brightness can be achieved.

[0125] This further refers to Fig. 5, which is a view illustrating a simulation result of an output light profile of an OLED according to an embodiment of the present invention.

[0126] As described above, in this embodiment the concave groove 144, in which the reflective electrode 150 is formed, is filled with the first filling structure 155, so that the surface of a substrate in the light emission region is essentially flat and thus the organic light-emitting layer 167 has an essentially uniform thickness. Accordingly, with reference to Fig. 5 shows that a profile of light emitted from the pixel area P is essentially uniform and thus brightness uniformity can be achieved.

[0127] According to the embodiment described above, the reflecting electrode under the organic light-emitting diode is designed to have a concave shape.

[0128] Accordingly, the reflecting electrode acts as a concave mirror, and the angle of incidence of the reflected light becomes small. This improves color mixing due to light spreading into an adjacent pixel area and reduces light loss caused by total internal reflection.

[0129] Furthermore, the concave groove in which the reflecting electrode is formed is filled with the filler structure to essentially flatten the surface of a substrate.

[0130] Accordingly, the organic light-emitting layer 167 has essentially a uniform thickness, and thus uniformity of brightness can be achieved.

[0131] As described above, one embodiment of the concave groove 144, in which the reflective electrode 150 is formed, is filled with the first filling structure 155. However, the present invention is not limited thereto. In some embodiments, a first structure may be located on the reflective electrode. The first electrode may be located on the first structure, and a section of the first electrode corresponding to the concave section may be essentially flat due to the first structure.

[0132] The first electrode can be electrically connected to the reflecting electrode. In particular, the first electrode can be electrically connected to the reflecting electrode through a contact hole provided in the first structure, or the first electrode can make direct contact with the reflecting electrode.

[0133] In the case where the first electrode is in direct contact with the reflecting electrode, an upper surface of the first structure can be at the same height as an upper surface of the section of the reflecting electrode that is not the concave section. Accordingly, the first electrode contacts only a different section of the reflecting electrode than the concave section. Alternatively, an upper surface of the first structure can be lower than an upper surface of the section of the reflecting electrode that is not the concave section. Accordingly, the first electrode can also make contact with a different section of the reflecting electrode than the concave section.

Claims

[1] Organic light-emitting display device (100) comprising: a substrate (101); a reflective electrode (150) in a pixel area (P) on the substrate (101) and with a concave section (151) that defines a concave trench (144); a first filling structure (155) that fills the concave trench (144); a first electrode (165) on the first filling structure (155) and on a section of the reflecting electrode (150) around the first filling structure (155); an organic light-emitting layer (167) on the first electrode (165); a second electrode (169) on the organic light-emitting layer (167); a bank (166) which is arranged in an edge section of the first electrode (165); a passivation layer (141) located below the reflecting electrode (150) and having a concave surface (141a) on which the concave section (151) of the reflecting electrode (150) is formed, wherein the passivation layer (141) has a drain contact hole (142) below the bench (166); a thin-film transistor (Td) arranged below the passivation layer (141) in the pixel area (P), wherein a drain electrode (133) of the thin-film transistor (Td) and an edge section of the reflecting electrode (150) are connected through the drain contact hole (142) below the bank (166); and a second filling structure (156) that fills the drain contact hole (142) in the edge section of the reflecting electrode (150), wherein the edge section of the first electrode (165) contacts an upper surface of the second filling structure (156) and an upper surface of the edge section of the reflecting electrode (150) around the second filling structure (156). [2] Organic light-emitting display device according to claim 1, wherein an upper surface of the first filling structure (155) has the same height as an upper surface of the section of the reflecting electrode (150) around the first filling structure (155). [3] Organic light-emitting display device according to claim 1 or 2, wherein the organic light-emitting layer (167) emits white light, wherein a color filter structure (190r, 190g, 190b) is located on the second electrode (169). [4] Organic light-emitting display device according to any one of claims 1 to 3, wherein the second electrode (169) is transparent or semi-transparent. [5] Organic light-emitting display device (100) comprising: a reflective electrode (150) in a pixel area (P) on a substrate (101) and with a concave section (151) that defines a concave trench (144); a first structure on the reflecting electrode (150); a first electrode (165) on the first structure, wherein a section of the first electrode (165) corresponding to the concave section (151) is essentially flat, and the first electrode (165) is electrically connected to the reflecting electrode (150); an organic light-emitting layer (167) on the first electrode (165); a second electrode (169) on the organic light-emitting layer (167) ; a bank (166) which is arranged in an edge section of the first electrode (165); a passivation layer (141) located below the reflecting electrode (150) and having a concave surface (141a) on which the concave section (151) of the reflecting electrode (150) is formed, wherein the passivation layer (141) has a drain contact hole (142) below the bench (166); a thin-film transistor (Td) arranged below the passivation layer (141) in the pixel area (P), wherein a drain electrode (133) of the thin-film transistor (Td) and an edge section of the reflecting electrode (150) are connected through the drain contact hole (142) below the bank (166); and a second filling structure (156) that fills the drain contact hole (142) in the edge section of the reflecting electrode (150), wherein the edge section of the first electrode (165) contacts an upper surface of the second filling structure (156) and an upper surface of the edge section of the reflecting electrode (150) around the second filling structure (156). [6] Organic light-emitting display device according to claim 5, wherein the first electrode (165) is electrically connected to the reflecting electrode (150) through a contact hole provided in the first structure. [7] Organic light-emitting display device according to claim 5, wherein the first electrode (165) directly contacts the reflecting electrode (150). [8] Organic light-emitting display device according to claim 7, wherein the first electrode (165) is in contact only with a section of the reflecting electrode (150) other than the concave section (151). [9] Organic light-emitting display device according to claim 7, wherein the first electrode (165) is in contact with a section of the concave section (151) of the reflecting electrode (150). [10] Organic light-emitting display device according to claim 8, wherein an upper surface of the first structure has the same height as an upper surface of the section of the reflecting electrode (150) that is not the concave section (151). [11] Organic light-emitting display device according to claim 9, wherein an upper surface of the first structure is lower than an upper surface of the section of the reflecting electrode (150) that is not the concave section (151).

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