Organic light-emitting display device

Abstract

An organic light-emitting display device (100) comprising: a reflective electrode (150) in a pixel area (P) on a substrate (101) and having a concave section (151) defining a concave trench (144); a first filler structure (155) filling the concave trench (144); a first electrode (165) on the first filler structure (155) and on a section of the reflective electrode (150) surrounding the first filler structure (155); an organic light-emitting layer (167) on the first electrode (165); and a second electrode (169) on the organic light-emitting layer (167).

Description

[0001] The present application claims the priority advantage of Korean patent application No. 10-2017-0177829, which was filed in the Republic of Korea on December 22, 2017. BACKGROUND OF THE INVENTION Area of ​​the invention

[0002] The present invention relates to an organic light-emitting display device (OLED). Discussion of the related technology

[0003] Recently, flat display devices, which are excellent in their thin profile, light weight and low energy consumption, have been developed and widely used.

[0004] 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.

[0005] 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.

[0006] 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. SUMMARY OF THE INVENTION

[0007] 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.

[0008] One object of the present invention is to improve an OLED that can improve (or reduce) color mixing or light loss.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] The organic light-emitting display device may also include a thin-film transistor in the pixel area.

[0014] The organic light-emitting display device may further include: a second filling structure that fills a drain contact hole of the passivation layer.

[0015] A drain electrode of the thin-film transistor and the reflecting electrode can be connected through the drain contact hole.

[0016] The organic light-emitting layer can emit white light.

[0017] A color filter structure can be located on the second electrode.

[0018] The second electrode can be transparent or semi-transparent.

[0019] 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. List of characters

[0020] 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 from 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

[0021] 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.

[0022] 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.

[0023] Referring to Fig. 1 includes the OLED 100 This embodiment has a multitude of pixel areas. P in a display area for showing images, and the multitude of pixel areas P are arranged in a matrix form.

[0024] The multitude of pixel areas P can red ( R ), green ( G ) and blue ( B ) Pixel areas Pto display red, green, and blue colors respectively. The red ( R ), green ( G ) and blue ( B ) Pixel areas P can be arranged alternately along a direction.

[0025] A structure of the OLED 100 will continue with reference to Fig. 2 explained in more detail.

[0026] The OLED 100 can comprise two substrates, i.e., a first substrate 101 and a second substrate 181 , which are facing each other.

[0027] The first substrate 101 can be an array substrate and contains controls to control each pixel area P to operate.

[0028] The second substrate 181 is a first substrate 101 opposite substrate. The second substrate 181 can be used as an encapsulation substrate for encapsulating the first substrate 101 serve. Alternatively, the second substrate can be used. 181It should be omitted.

[0029] The OLED 100 It could be a top-emitter type OLED.

[0030] In this respect, light is absorbed by the first substrate 101 emitted upwards, so that an outer surface of the second substrate 181 serves as a display surface (or light output surface).

[0031] Although not shown in the drawings, a circular polarizing plate can be attached to the outer surface of the second substrate. 181 It may be appropriate to improve the reflection of external light.

[0032] In each pixel area P of the first substrate 101 The array consists of 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.

[0033] More precisely, a semiconductor layer 112on an inner surface of the first substrate 101 be formed. The semiconductor layer 112 It can be made of polysilicon, for example, but is not limited to that.

[0034] On the semiconductor layer 112 can be an insulating layer, for example a gate insulating layer 115 , be trained. The gate insulating layer 115 can be completely above the first substrate 101 be trained.

[0035] The gate insulating layer 115 It may be made from an inorganic insulating material, for example silicon oxide or silicon nitride.

[0036] A gate electrode 120 can be on the gate insulating layer 115 be arranged and in a central section of the semiconductor layer 112 correspond. The gate electrode 120 It can be made from a conductive material, for example a metal material.

[0037] A gate line connected to a gate electrode of the switching TFT can be located on the gate insulating layer. 115 be trained.

[0038] An insulating layer, for example an intermediate insulating layer. 125 , can be on the gate electrode 120 be formed. The intermediate layer insulating layer 125 can be completely above the first substrate 101 be trained.

[0039] The intermediate layer insulating layer 125 It can be made from an inorganic insulating material, for example silicon oxide or silicon nitride, or an organic insulating material, for example benzocyclobutene or photoacrylic.

[0040] The intermediate layer insulating layer 125 can a first contact hole 126a and a second contact hole 126b containing both sides of the semiconductor layer 112 uncover.

[0041] The first and second contact holes 126a and 126b are located on both sides of the gate electrode 120 and are from the gate electrode 120 spaced apart. The first and second contact holes 126a and 126b can also occur in the gate insulating layer 115 be trained.

[0042] On the intermediate layer insulating layer 125 can a source electrode 131 and a drain electrode 133 be trained. The source and drain electrodes 131 and 133 They can be made from a conductive material, for example a metal material.

[0043] A data line can be placed on the intermediate layer-insulating layer. 125 It must be trained. The data line crosses the gate line and is connected to a source electrode of the switching TFT.

[0044] The source and drain electrodes 131 and 133are spaced apart from each other, with the gate electrode 120 in between. The source and drain electrodes. 131 and 133 Each of the two sides of the semiconductor layer can 112 through the first and second contact holes 126a or 126b contact.

[0045] The semiconductor layer 112 , the gate electrode 120 and the source and drain electrodes 131 and 133 form the driver TFT Td .

[0046] Alternatively, the driver TFT can be used. Td They have an inverted offset structure, in which a gate electrode is formed beneath a semiconductor layer and source and drain electrodes are formed on top of the semiconductor layer. In this case, the semiconductor layer can, for example, consist of amorphous silicon.

[0047] Although not shown in the drawings, the switching TFT can be designed to have the same structure as the driver TFT. Td exhibits.

[0048] A first passivation layer 140 as an insulating layer on the source and drain electrodes 131 and 133 be formed. The first passivation layer 140 can be completely above the first substrate 101 be trained.

[0049] The first passivation layer 140 It may be made from an inorganic insulating material, for example silicon oxide or silicon nitride.

[0050] A second passivation layer 141 as an insulating layer on the first passivation layer 140 be formed. The second passivation layer 141 can be completely above the first substrate 101 be trained.

[0051] The second passivation layer141 It may be made from an organic insulating material, for example benzocyclobutene or photoacrylic.

[0052] The first and second passivation layers 140 and 141 can a drain contact hole 142 exhibit that the drain electrode 133 exposes.

[0053] Alternatively, a single-layer passivation structure can be applied with the second passivation layer on the driver TFT. Td be applied.

[0054] The second passivation layer 141 can create a concave cavity in each pixel area P contain.

[0055] In this respect, a section of the second passivation layer 141 , which corresponds to a light emission range in which the organic light-emitting diode OD in the pixel area P is formed, an upper surface 141a, which is sunken downwards (i.e. in the direction of the first) substrate 101 ) have a concave curved shape. This recessed surface 141a is considered a concave surface 141a designated.

[0056] A space in a recessed form on the concave surface 141a is the concave trench 144 Accordingly, the concave trench 144 , which is due to the concave surface 141a (i.e., from the concave surface) 141a is defined as being surrounded) in the second passivation layer 141 be set up.

[0057] A section of the second passivation layer 141 around the concave trench 144 The area around it (or surrounding it) can have a flat (or level) state. In other words, the section of the second passivation layer can be... 141 around the concave trench 144 have a flat top surface.

[0058] The second passivation layer 141 can be created, for example, by a photolithography process using a halftone mask.

[0059] A reflective electrode 150 is on the second passivation layer 141 in every pixel area P trained.

[0060] The reflecting electrode 150 can through the drain contact hole 142 with the drain electrode 133 be connected.

[0061] A section of the reflecting electrode 150 , which is in the drain contact hole 142 It is arranged along the inner surfaces of the drain contact hole. 142 extend to the drain electrode 133 to contact.

[0062] The reflecting electrode 150 can according to the concave trench 144 the second passivation layer 141 be trained.

[0063] Accordingly, a section of the reflecting electrode can 150 , which is in the concave trench 144 It is formed in essentially the same shape as the concave surface. 141a have.

[0064] In other words, the section of the reflecting electrode can 150 in the concave trench 144 along the concave surface 141a be designed to essentially have the same shape as the concave surface 141a to have. This section of the reflecting electrode 150 in the concave trench 144 is described as a concave section 151 designated.

[0065] Accordingly, the concave trench 144 the second passivation layer 141 on the concave section 151 the reflecting electrode 150 remain.

[0066] In other words, the reflecting electrode 150can also the concave trench 144 exhibiting, which is located on the concave section 151 is located. That is, the concave section 151 the reflecting electrode 150 can the concave trench 144 define.

[0067] Furthermore, the reflecting electrode can 150 on the flat surface of the section of the second passivation layer 141 around the concave surface 141a be formed around it. The section of the reflecting electrode 150 , which is located on the flat surface of the section of the second passivation layer 141 around the concave surface 141a ^around it, it essentially has a flat shape.

[0068] The reflecting electrode 150 It can be made from a metallic material that has a high reflectivity, such as silver (Ag).

[0069] The reflecting electrode 150It can have a single-layer or multi-layer structure.

[0070] In the case of the reflective electrode 150 With a multilayered structure, an upper layer of the reflecting electrode can be used. 150 be made of a metallic material with a reflectivity, and a lower layer of the reflecting electrode 150 can be formed from a conductive material with high adhesion properties, for example ITO.

[0071] In this respect, it shows Fig. 3 the reflecting electrode 150 a two-layer structure as an example of a multi-layer structure. This reflective electrode 150 can a first layer 150a as a lower layer formed from a transparent conductive material, for example ITO, and a second layer 150bas an upper layer formed from a reflective metallic material, for example Ag.

[0072] A first filling structure 155 can be applied to the reflecting electrode 150 be trained. In detail, the first filling structure can be 155 on the concave section 151 the reflecting electrode 150 be arranged and the concave section 151 cover.

[0073] The first filling structure 155 can be set up to fill the concave trench 144 , in which the reflecting electrode 150 is trained to fill completely.

[0074] 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 be essentially flat.

[0075] In other words, since the first filling structure 155 is designed to create the concave section 151 covered and the concave trench 144 Fills, a flat upper surface of the first filling structure can be formed. 155 and a flat upper surface of the reflecting electrode 150 to create the first filling structure 155 They are essentially the same height.

[0076] Furthermore, a second filling structure can be used. 156 on the reflecting electrode 150 in the drain contact hole 142 be trained to access the drain contact hole 142 to fill.

[0077] 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 be essentially flat around.

[0078] In other words, since the second filling structure 156 to fill the drain contact hole 142 Once formed, a flat upper surface of the second filling structure can be achieved. 156 and a flat upper surface of the reflecting electrode 150 to create the second filling structure 156 They are essentially the same height.

[0079] The first and second filling structure 155 and 156 They may be made from an organic insulating material, for example benzocyclobutene or photoacrylic.

[0080] A first electrode 165 can be in any pixel area P on the first substrate 101 with the first and second filling structure 155 and 156 be trained.

[0081] The first electrode 165 It can be made from a transparent conductive material, such as ITO.

[0082] The first electrode165 can the first filling structure 155 and the section of the reflecting electrode 150 to create the first filling structure 155 contact around.

[0083] When the first electrode 165 is formed, the upper surface of the section of the reflecting electrode 150 , which is not through the first filling structure 155 is covered (or around the first filling structure) 155 (which is exposed around it), to contact the first electrode. 165 able to electrically connect to the drain electrode 133 through the reflecting electrode 150 to be connected.

[0084] Furthermore, the first electrode can 165 the second filling structure 156 and the section of the reflecting electrode 150 to create the second filling structure 155 contact around.

[0085] As described above, since the first substrate 101with the first and second filling structure 155 and 156 essentially has a flat surface, the first electrode 165 be designed in such a way that it is essentially flat.

[0086] A bench (or partition) 166 can be done at the first electrode 165 along a boundary of each pixel area P be trained and know every pixel area P surrounded.

[0087] The Bank 166 may have an opening that allows access to the first electrode 165 in every pixel area P exposes, and can reveal an edge section of the first electrode 165 cover.

[0088] In other words, the edge section of the first electrode 165 and an edge section of the reflecting electrode 150 can below the bank 166 be arranged so that they are removed from the bank 166The edge sections of the first electrode are covered. 165 and the reflecting electrode 150 cannot be exposed, so they have an organic light-emitting layer 167 Do not contact.

[0089] The Bank 166 can be designed in such a way that it forms an edge section of the concave trench 144 the reflecting electrode 150 shields (or covers). In this respect, if the edge section of the concave trench 144 not across the board 166 is shielded and located on an inside side of the bank 166 When arranged, light is bent towards an adjacent pixel area, causing color mixing.

[0090] The organic light-emitting layer 167 can be applied to the first electrode 165 be trained, which is facilitated by the opening of the bank 166is exposed. The organic light-emitting layer 167 It can have a multilayered structure that contains an emissive material layer.

[0091] Since the first electrode 165 Essentially flat, the organic light-emitting layer 167 on the first electrode 165 formed in a flat state.

[0092] The organic light-emitting layer 167 , which are in each of the red, green and blue pixel areas P The resulting organic light-emitting layer can be a white organic layer that emits a white color. Alternatively, the organic light-emitting layers can be... 167 , which are located in the red, green and blue pixel areas respectively P are formed as red, green and blue organic light-emitting layers, each emitting red, green and blue colors.

[0093] In this embodiment, the organic light-emitting layer is used 167 in each of the red, green, and blue pixel areas P For example, a white organic light-emitting layer.

[0094] Alternatively, the organic light-emitting layer can be used 167 corresponding to all pixel areas P be formed. In other words, the organic light-emitting layer can be formed. 167 across all pixel areas P to be continuously trained.

[0095] A second electrode 169 can occur on the organic light-emitting layer 167 and completely above the first substrate 101 be trained.

[0096] The second electrode 169 can be configured as a permeable (or transparent) electrode. In this case, the second electrode can 169be made of a transparent conductive material, such as ITO.

[0097] Alternatively, the second electrode can be used 169 It can be configured as a semi-permeable (or semi-transparent) electrode. In this case, a microcavity effect can be achieved to increase emission efficiency. In this case, the second electrode can 169 be made of a metallic material, for example magnesium (Mg), silver (Ag) or an alloy of magnesium and silver, and this metallic material may be formed with a small thickness to achieve a semi-permeable property.

[0098] Since the organic light-emitting layer 167 If it is flat, a section of the second electrode can 169 on the organic light-emitting layer 167 be flat.

[0099] The first electrode 165 , the organic light-emitting layer 167and the second electrode 169 form the organic light-emitting diode OD in the pixel range P One of the first and second electrodes serves as the anode and the other as a cathode.

[0100] A third passivation layer 170 can be applied to the second electrode 169 and completely above the first substrate 101 be formed. The third passivation layer 170 It can serve to prevent the ingress of external moisture or oxygen and increase reliability.

[0101] The third passivation layer 170 It can be made of an inorganic insulating material, for example silicon oxide or silicon nitride. Furthermore, the third passivation layer can... 170 be designed to have a multilayered structure comprising at least one of silicon oxide or silicon nitride.

[0102] The second substrate 181 can occur on the third passivation layer 170 condition.

[0103] An adhesive layer 183 can be between an inner surface of the third passivation layer 170 and an inner surface of the second substrate 181 be trained.

[0104] A color filter layer 190 can form on an outer surface of the second substrate 181 to locate a color for each pixel area P to implement.

[0105] The color filter layer 190 can, for example, red, green, and blue color filter structures 190r , 190g and 190b containing the red, green, and blue pixel areas, respectively. P are equivalent to.

[0106] Accordingly, a white light is emitted from the organic light-emitting diode. OD , which emits white light, through each of the corresponding red, green and blue color filter structures 190r , 190g and 190b , so that red, green and blue colors can be output.

[0107] Furthermore, a black matrix 195 along a boundary of each pixel area P on the outer surface of the second substrate 181 be trained.

[0108] As described above, in this embodiment the reflecting electrode 150 with the concave structure below the organic light-emitting diode OD formed in the light emission range.

[0109] Accordingly, the reflective electrode serves 150 as a concave mirror and can therefore emit incident light essentially vertically upwards.

[0110] 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. 4. For explanatory purposes, some components of the OLED are shown. 100 omitted.

[0111] Further with reference to Fig. 4 becomes a light that is in the organic light-emitting layer 167 is generated and moves downwards from the reflecting electrode 150 reflected.

[0112] The reflecting electrode 150 It has a concave structure that is recessed downwards, and thus serves as a concave mirror.

[0113] Thus, even if there is an angle of incidence θi of a light Li The angle of incidence is large with respect to a normal direction to a surface of a substrate. θr with respect to the normal direction due to the concave mirror function of the reflecting electrode 150 for the light Li small.

[0114] Accordingly, a reflection from the reflecting electrode is generated. 150 reflected light Lr concentrated and essentially in a forward direction of OLED 100 issued.

[0115] Thus, since the reflected light Lr essentially within each pixel area P Color mixing due to light spreading into an adjacent pixel area is prevented.

[0116] Since the angle of incidence θr of the reflected light Lr Furthermore, if the light loss is small, it can prevent (or reduce) light loss due to light being guided laterally by total internal reflection at an interface between stacked layers with different refractive indices.

[0117] In this regard, for example, since the second electrode 169 has a refractive index greater than that of the third passivation layer 170 is the one on the second electrode 169 If the angle of incidence of reflected light is similar to that in the technique in question, total internal reflection will occur.

[0118] In this embodiment, however, the angle of incidence θr of the reflected light Lr due to the concave reflective electrode 150 small. Therefore, light loss due to total internal reflection can be improved.

[0119] Furthermore, in this embodiment the concave trench 144 with the reflective electrode 150 containing the first filling structure 155 filled so that the surface of a substrate in the light emission area is essentially flat.

[0120] Accordingly, the organic light-emitting layer 167 Essentially a uniform thickness.

[0121] Therefore, a uniform electric field is applied to the entire organic light-emitting layer. 167 This is applied, and thus a uniformity of brightness can be achieved.

[0122] 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.

[0123] As described above, in this embodiment the concave trench 144 , in which the reflecting electrode 150 is formed, with the first filling structure 155 filled, so that a surface of a substrate in the light emission area is essentially flat, and thus the organic light-emitting layer 167Essentially a uniform thickness. Accordingly, it refers to Fig. 5 to see that a profile of a light that is from the pixel area P The output is essentially uniform, thus achieving a uniformity of brightness.

[0124] According to the embodiment described above, the reflecting electrode under the organic light-emitting diode is designed to have a concave shape.

[0125] 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.

[0126] 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.

[0127] Accordingly, the organic light-emitting layer exhibits 167 It essentially has a uniform thickness, and thus uniformity of brightness can be achieved.

[0128] As described above, one embodiment of the concave trench 144 , in which the reflecting electrode 150 is formed, with the first filling structure 155 filled. However, the present invention is not limited thereto. In some embodiments, a first structure may be located on the reflecting 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.

[0129] 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.

[0130] 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.

[0131] It is obvious to a person skilled in the art that various modifications and variations can be made to the present invention without deviating from the scope of protection of the disclosure. It is therefore intended that the present invention covers the modifications and variations of this disclosure, provided that they fall within the scope of protection of the appended claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 1020170177829

[0001]

Claims

[] What is claimed: [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); and a second electrode (169) on the organic light-emitting layer (167). [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, further comprising 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. [4] Organic light-emitting display device according to claim 3, further comprising a thin-film transistor (Td) in the pixel area (P) and a second filling structure (156) that fills a drain contact hole (142) of the passivation layer (141), wherein a drain electrode (133) of the thin-film transistor (Td) and the reflecting electrode (150) are connected through the drain contact hole (142). [5] Organic light-emitting display device according to any one of claims 1 to 4, 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). [6] Organic light-emitting display device according to any one of claims 1 to 5, wherein the second electrode (169) is transparent or semi-transparent. [7] 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); and a second electrode (169) on the organic light-emitting layer (167). [8] Organic light-emitting display device according to claim 7, wherein the first electrode (165) is electrically connected to the reflecting electrode (150) through a contact hole provided in the first structure. [9] Organic light-emitting display device according to claim 7, wherein the first electrode (165) directly contacts the reflecting electrode (150). [10] Organic light-emitting display device according to claim 9, wherein the first electrode (165) is in contact only with a section of the reflecting electrode (150) other than the concave section (151). [11] Organic light-emitting display device according to claim 9, wherein the first electrode (165) is in contact with a section of the concave section (151) of the reflecting electrode (150). [12] Organic light-emitting display device according to claim 10, 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). [13] Organic light-emitting display device according to claim 11, 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). [14] Organic light-emitting display device according to any one of claims 7 to 13, further comprising a passivation layer (141) located below the reflecting electrode (150) and having a concave surface on which the concave section (151) of the reflecting electrode (150) is formed. [15] Organic light-emitting display device according to claim 14, further comprising a second structure filling a drain contact hole (142) of the passivation layer (141), wherein a drain electrode (133) of a thin-film transistor (Td) in the pixel area (P) and the reflecting electrode (150) are connected through the drain contact hole (142).