Organic light emitting display device and method for manufacturing organic light emitting display device

Abstract

Disclosed is an organic light emitting display device including a plurality of light emitting areas emitting light of different colors. The organic light emitting display device includes first to third pattern electrodes connected to driving elements, respectively; an organic light emitting structure disposed on the first to third pattern electrodes; a common electrode disposed on the organic light emitting structure; and a resonance control pattern disposed between the first pattern electrode and the organic light emitting structure, overlapping the first light emitting area, and including a conductive oxide. The organic light emitting structure includes a hole transport layer, an electron transport layer, and a light emitting layer disposed between the hole transport layer and the electron transport layer. The light emitting layer includes a common light emitting layer continuously extending within the organic light emitting structure, and a light emitting pattern overlapping the third pattern electrode.

Description

Organic light-emitting display device and method for manufacturing organic light-emitting display device Technical Field

[0001] This invention relates to display devices. More specifically, this invention relates to organic light-emitting display devices and methods for manufacturing organic light-emitting display devices. Background Technology

[0002] Organic light-emitting display devices include an organic light-emitting layer for generating light. Depending on the wavelength (color) of the light to be emitted, the organic light-emitting layer can have different configurations.

[0003] The individual layers of an organic light-emitting layer can be easily damaged by etchants, etc. Therefore, the deposition of a mask, such as a fine metal mask, is used to form the organic light-emitting layer. Summary of the Invention

[0004] [Technical problems to be solved]

[0005] One object of the present invention is to provide an organic light-emitting display device that can be manufactured using fewer masks and has increased design freedom.

[0006] Another object of the present invention is to provide a method for manufacturing an organic light-emitting display device.

[0007] However, the present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0008] [Solutions]

[0009] To achieve the objectives of this invention, an organic light-emitting display device according to an embodiment has multiple light-emitting regions that emit light having different colors from each other. The organic light-emitting display device includes: a first patterned electrode, a second patterned electrode, and a third patterned electrode; an organic light-emitting structure disposed on the first, second, and third patterned electrodes; a common electrode disposed on the organic light-emitting structure; and a resonant modulation pattern disposed between the first patterned electrode and the organic light-emitting structure. Each of the first, second, and third patterned electrodes is connected to a driving electrode. The resonant modulation pattern overlaps with a first light-emitting region that overlaps with the first patterned electrode among the multiple light-emitting regions and includes a conductive oxide. The organic light-emitting structure includes a hole transport layer, a light-emitting layer, and an electron transport layer. The light-emitting layer includes a common light-emitting layer extending continuously within the organic light-emitting structure and a light-emitting pattern overlapping the third patterned electrode.

[0010] In an embodiment, a first light-emitting region emits a first color light, a second light-emitting region among the plurality of light-emitting regions that overlaps with the second pattern electrode emits a second color light, and a third light-emitting region among the plurality of light-emitting regions that overlaps with the light-emitting pattern emits a third color light.

[0011] In this embodiment, each of the first patterned electrode, the second patterned electrode, and the third patterned electrode includes a reflective layer. The distance between the common electrode and the reflective layer of the first patterned electrode is the same as or close to the resonant thickness of the first color light. The distance between the common electrode and the reflective layer of the second patterned electrode is the same as or close to the resonant thickness of the second color light. The distance between the common electrode and the reflective layer of the third patterned electrode is the same as or close to the resonant thickness of the third color light.

[0012] In this embodiment, the first color light is red light, the second color light is green light, and the third color light is blue light.

[0013] In one embodiment, the common light-emitting layer produces yellow light, and the light-emitting pattern produces blue light.

[0014] In this embodiment, the common light-emitting layer includes green dopant and red dopant.

[0015] In one embodiment, the common light-emitting layer includes a yellow dopant.

[0016] In this embodiment, the first color light is green, the second color light is blue, and the third color light is red.

[0017] In one embodiment, the common light-emitting layer produces cyan light, and the light-emitting pattern produces red light.

[0018] In this embodiment, the light-emitting pattern is disposed between the common light-emitting layer and the hole transport layer.

[0019] In an embodiment, the organic light-emitting display device further includes a pixel defining layer having openings overlapping with the first pattern electrode, the second pattern electrode, and the third pattern electrode, and a portion of the resonant modulation pattern is disposed beneath the pixel defining layer.

[0020] In an embodiment, the organic light-emitting display device further includes a pixel defining layer having openings overlapping with the first pattern electrode, the second pattern electrode, and the third pattern electrode, and a portion of the resonant modulation pattern is disposed on the pixel defining layer.

[0021] In an embodiment, the resonance modulation pattern includes at least one selected from the group consisting of indium tin oxide, indium zinc oxide, zinc tin oxide, indium oxide, zinc oxide, and tin oxide.

[0022] A method for manufacturing an organic light-emitting display device according to an embodiment includes: forming a first patterned electrode, a second patterned electrode, and a third patterned electrode, each of the first patterned electrode, the second patterned electrode, and the third patterned electrode being connected to a driving element; forming a resonant modulation pattern comprising a conductive oxide on the first patterned electrode; forming a hole transport layer on the resonant modulation pattern, the second patterned electrode, and the third patterned electrode; forming a light-emitting pattern overlapping the third patterned electrode on the hole transport layer; forming a common light-emitting layer on the hole transport layer; forming an electron transport layer on the common light-emitting layer; and forming a common electrode on the electron transport layer.

[0023]

Effects of the Invention

[0024] According to embodiments of the present invention, the number of masks required to form the organic light-emitting structure can be reduced. Furthermore, the allowance for preventing pattern overlap can be minimized, thereby increasing the aperture ratio, and light-emitting regions with various shapes can be designed. Attached Figure Description

[0025] Figure 1 is a cross-sectional view showing an organic light-emitting display device according to an embodiment of the present invention.

[0026] Figure 2 is a plan view showing an organic light-emitting display device according to an embodiment of the present invention.

[0027] Figure 3 is an enlarged plan view showing area "A" in Figure 1.

[0028] Figures 4 to 9 are cross-sectional views illustrating a method for manufacturing an organic light-emitting display device according to an embodiment of the present invention.

[0029] Figures 10 to 12 are plan views illustrating an organic light-emitting display device according to an embodiment of the present invention.

[0030] Figures 13 and 14 are cross-sectional views illustrating a method for manufacturing an organic light-emitting display device according to an embodiment of the present invention.

[0031] Figure 15 is a cross-sectional view showing an organic light-emitting display device according to an embodiment of the present invention. Detailed Implementation

[0032] The organic light-emitting display device and the method for manufacturing the organic light-emitting display device according to the embodiments will be described more fully below with reference to the accompanying drawings, in which some embodiments are illustrated. In the drawings, the same or similar reference numerals may be used for the same or similar elements.

[0033] Figure 1 is a cross-sectional view showing an organic light-emitting display device according to an embodiment of the present invention. Figure 2 is a plan view showing an organic light-emitting display device according to an embodiment of the present invention. Figures 1 and 2 show a display area in which driving elements and light-emitting elements are disposed. Figure 3 is an enlarged plan view showing area "A" of Figure 1.

[0034] Referring to Figures 1 and 2, an organic light-emitting display device includes a display area that generates light to display an image. The display area includes multiple light-emitting regions that emit different colors of light. For example, the organic light-emitting display device may include a first light-emitting region LA1 that emits a first color of light, a second light-emitting region LA2 that emits a second color of light, and a third light-emitting region LA3 that emits a third color of light. In an embodiment, the first light-emitting region LA1 may emit red light R, the second light-emitting region LA2 may emit green light G, and the third light-emitting region LA3 may emit blue light B.

[0035] In this embodiment, the light-emitting regions LA1, LA2, and LA3 may each have a rhomboid shape. However, the embodiment is not limited to this. For example, the light-emitting regions LA1, LA2, and LA3 may have different shapes from each other. Furthermore, the light-emitting regions LA1, LA2, and LA3 may have various shapes such as square, rectangular (other than square), triangular, hexagonal, or circular. Additionally, the edges or corners of each of the light-emitting regions LA1, LA2, and LA3 may have rounded edges or be chamfered.

[0036] In the embodiments, the light-emitting regions LA1, LA2, and LA3 may have different sizes than each other. For example, the second light-emitting region LA2, which emits green light G, may have a smaller size than the first light-emitting region LA1, which emits red light R, and the third light-emitting region LA3, which emits blue light B.

[0037] However, the embodiments are not limited thereto. For example, the first light-emitting region LA1 or the third light-emitting region LA3 may have a smaller size than the other light-emitting regions, or the light-emitting regions LA1, LA2 and LA3 may have the same size.

[0038] An organic light-emitting display device includes a light-emitting element and a driving element electrically connected to the light-emitting element. The light-emitting element generates light in response to an electrical signal or power applied thereto. The light generated by the light-emitting element is emitted outward through a light-emitting area. In an embodiment, the light-emitting element may be an organic light-emitting diode (OLED).

[0039] The driving element and the light-emitting element can be disposed on the substrate 110. For example, the driving element may include a first driving element TR1, a second driving element TR2, and a third driving element TR3.

[0040] The drive elements TR1, TR2 and TR3 can have the same configuration as conventionally known drive elements.

[0041] The driving elements TR1, TR2, and TR3 may be covered by the insulating structure 120. The insulating structure 120 may include an inorganic insulating layer, an organic insulating layer, or a combination thereof.

[0042] Driving elements TR1, TR2, and TR3 are electrically connected to their respective light-emitting elements. For example, a light-emitting element may include an anode, an organic light-emitting structure, and a cathode. The light-emitting element receives electrical signals depending on the operation of the driving elements, thereby generating light.

[0043] In an embodiment, the light-emitting element includes a patterned electrode electrically connected to each of the driving elements TR1, TR2, and TR3. For example, the patterned electrode may function as the anode of an organic light-emitting diode.

[0044] For example, an organic light-emitting display device includes a first pattern electrode PE1 electrically connected to a first driving element TR1, a second pattern electrode PE2 electrically connected to a second driving element TR2, and a third pattern electrode PE3 electrically connected to a third driving element TR3.

[0045] The organic light-emitting structure OL is disposed on the patterned electrodes PE1, PE2, and PE3. The common electrode CE is disposed on the organic light-emitting structure OL. The common electrode CE can function as a cathode. The common electrode CE can be referred to as the upper electrode.

[0046] A pixel defining layer (PDL) can be disposed on the insulating structure 120. The pixel defining layer (PDL) has openings that overlap with the patterned electrodes PE1, PE2, and PE3. The openings can define the shape and size of the light-emitting regions LA1, LA2, and LA3.

[0047] In an embodiment, the organic light-emitting structure OL may include a hole transport layer (HTL), a light-emitting layer, and an electron transport layer (ETL). In an embodiment, the light-emitting layer includes a light-emitting pattern (LP) and a common light-emitting layer (CEL). The light-emitting pattern LP includes dopants different from those in the common light-emitting layer (CEL).

[0048] In this embodiment, the hole transport layer HTL, the common light-emitting layer CEL, and the electron transport layer ETL can be formed as a common layer extending continuously within the organic light-emitting structure OL. A light-emitting pattern LP can be selectively formed in the corresponding light-emitting region to have a patterned shape. In this embodiment, the light-emitting pattern LP can overlap with the third light-emitting region LA3, but may not overlap with the first light-emitting region LA1 and the second light-emitting region LA2. Furthermore, the light-emitting pattern LP can be disposed between the common light-emitting layer CEL and the hole transport layer HTL.

[0049] For example, the organic light-emitting structure OL in the first light-emitting region LA1 may include a hole transport layer HTL, a common light-emitting layer CEL, and an electron transport layer ETL. The organic light-emitting structure OL in the second light-emitting region LA2 may include a hole transport layer HTL, a common light-emitting layer CEL, and an electron transport layer ETL. The organic light-emitting structure OL in the third light-emitting region LA3 may include a hole transport layer HTL, a light-emitting pattern LP, a common light-emitting layer CEL, and an electron transport layer ETL.

[0050] In one embodiment, the common light-emitting layer (CEL) can generate yellow light. For example, the yellow light can have a first peak corresponding to green light and a second peak corresponding to red light. In another embodiment, the yellow light can have a broad spectrum that includes the region with the highest intensity in the yellow area.

[0051] The thickness of the organic light-emitting structure (OL) can be determined by the resonant thickness of the light emitted by the light-emitting regions LA1, LA2, and LA3. The resonant thickness can be defined by the thickness of the layers that can induce the resonant effect of the light. The light generated by the OL can resonate between electrodes comprising materials with high reflectivity. For example, the light generated by the OL can resonate between the patterned electrodes PE1, PE2, and PE3 and the common electrode CE.

[0052] The resonant thickness varies depending on the wavelength of the light. Therefore, if the distance between the patterned electrodes PE1, PE2, and PE3 and the common electrode CE is the same as or close to the resonant thickness of the light emitted by each of the light-emitting regions LA1, LA2, and LA3, then light with a specific wavelength can be selectively emitted from the light-emitting regions LA1, LA2, and LA3, or the intensity of the light can be increased.

[0053] For example, the thicknesses of the hole transport layer HTL, the common light-emitting layer CEL, and the electron transport layer ETL can be adjusted such that the sum of the thicknesses of the hole transport layer HTL, the common light-emitting layer CEL, and the electron transport layer ETL (if the patterned electrode includes an upper transmission conductive layer, the sum may further include the thickness of the upper transmission conductive layer) is the same as the resonant thickness t2 of the green light G emitted from the second light-emitting region LA2. Therefore, even if the organic light-emitting structure OL produces yellow light in the second light-emitting region LA2, it can still emit green light G from the second light-emitting region LA2 through the resonant effect.

[0054] A resonant modulation pattern SP is disposed in the first light-emitting region LA1, between the organic light-emitting structure OL and the first pattern electrode PE1. The resonant modulation pattern SP comprises a transparent conductive material. Therefore, even if the thickness of the organic light-emitting structure OL in the first light-emitting region LA1 differs from the resonant thickness t1 of the red light R emitted from the first light-emitting region LA1, the thickness of the resonant modulation pattern SP can be adjusted so that the distance between the common electrode CE and the first pattern electrode PE1 corresponds to the resonant thickness t1 of the red light R. Therefore, even if the organic light-emitting structure OL generates yellow light in the first light-emitting region LA1, red light R can still be emitted from the first light-emitting region LA1 through the resonant effect.

[0055] For example, the resonant tuning pattern SP can include metal oxides such as indium tin oxide, indium zinc oxide, zinc tin oxide, indium oxide, zinc oxide, or tin oxide.

[0056] For example, a portion of the resonant modulation pattern SP can be disposed beneath the pixel-defining layer PDL. Furthermore, the resonant modulation pattern SP can cover the side surface of the first patterned electrode PE1.

[0057] The luminescent pattern LP is disposed in the third luminescent region LA3. Therefore, even though the thicknesses of the hole transport layer HTL, the common luminescent layer CEL, and the electron transport layer ETL are determined by the resonant thickness t2 of the green light G emitted from the second luminescent region LA2, the thickness of the luminescent pattern LP can be adjusted such that the distance between the common electrode CE and the third pattern electrode PE3 corresponds to the resonant thickness t3 of the blue light B. Therefore, even though the organic light-emitting structure OL includes the common luminescent layer CEL that generates yellow light in the third luminescent region LA3, blue light B can be selectively emitted from the third luminescent region LA3.

[0058] In this embodiment, the luminescent pattern LP can preferably be disposed between the hole transport layer HTL and the common luminescent layer CEL. The binding of holes and electrons can primarily occur at the interface between the luminescent layer and the hole transport layer HTL. Therefore, this configuration can increase blue light B and minimize yellow light in the third luminescent region LA3.

[0059] The resonant thickness can vary depending on the resonance type and the wavelength of the light. In an embodiment, the thickness of the organic light-emitting structure OL in the second light-emitting region LA2 can be determined to be the same as or close to the primary resonant thickness of the green light G, and the thickness of the organic light-emitting structure OL in the third light-emitting region LA3 can be determined to be the same as or close to the secondary resonant thickness of the blue light B.

[0060] In embodiments, the patterned electrodes PE1, PE2, and PE3 may have a multilayer structure comprising a transparent conductive material and a metal with high reflectivity. For example, as shown in FIG3, the patterned electrodes PE1, PE2, and PE3 may each include a reflective layer ML comprising a metal such as silver (Ag) and an upper transmissive conductive layer UL disposed on the reflective layer ML and comprising a transparent conductive material. Furthermore, a lower transmissive conductive layer LL may be disposed below the reflective layer ML. In this configuration, the thickness of the organic light-emitting structure OL can be determined such that the distance between the common electrode CE and the reflective layer ML is the same as or close to the resonant thickness of the light emitted from each of the light-emitting regions LA1, LA2, and LA3.

[0061] The capping layer CPL can be placed on the common electrode CE. The capping layer CPL can protect the light-emitting element and increase the extraction efficiency of light generated by the organic light-emitting diode.

[0062] The encapsulation layer 200 can be disposed on the capping layer CPL. For example, the encapsulation layer 200 can have a stacked structure of organic thin films and inorganic thin films.

[0063] According to an embodiment of the present invention, the organic light-emitting structure OL includes a light-emitting pattern LP, and other organic layers are formed as a common layer. Therefore, the number of masks required to form the organic light-emitting structure OL can be reduced.

[0064] Furthermore, when patterning the organic light-emitting structure OL for each of the light-emitting regions LA1, LA2, and LA3, it may be necessary to keep appropriate pixel distances PG1 and PG2 within a close range to prevent pattern overlap due to manufacturing errors or misalignment. However, according to embodiments of the present invention, the patterns do not overlap. Therefore, the pixel distance can be minimized, thereby increasing the aperture ratio. Furthermore, the light-emitting regions LA1, LA2, and LA3 can be designed in various ways.

[0065] Figures 4 to 9 are cross-sectional views illustrating a method for manufacturing an organic light-emitting display device according to an embodiment of the present invention.

[0066] Referring to Figure 4, driving elements TR1, TR2, and TR3 are formed on the substrate 110. The driving elements TR1, TR2, and TR3 may be covered by the insulating structure 120.

[0067] Subsequently, patterned electrodes PE1, PE2, and PE3 are formed to be electrically connected to driving elements TR1, TR2, and TR3. For example, the first patterned electrode PE1 is electrically connected to the first driving element TR1, the second patterned electrode PE2 is electrically connected to the second driving element TR2, and the third patterned electrode PE3 is electrically connected to the third driving element TR3.

[0068] For example, the substrate 110 may include glass, quartz, sapphire, or polymer materials.

[0069] In this embodiment, the driving elements TR1, TR2, and TR3 include at least one thin-film transistor. For example, the driving elements TR1, TR2, and TR3 may include multiple thin-film transistors.

[0070] For example, the channel layer of a thin-film transistor can include amorphous silicon, polycrystalline silicon, or metal oxide semiconductor. For instance, a metal oxide semiconductor is a binary compound (AB) containing indium (In), zinc (Zn), gallium (Ga), tin (Sn), titanium (Ti), aluminum (Al), hafnium (Hf), zirconium (Zr), or magnesium (Mg). x ), ternary compounds (AB) x C y ) or quaternary compounds (AB) x C y D z For example, metal oxide semiconductors may include zinc oxide (ZnO). x Gallium oxide (GaO) x Titanium oxide (TiO) x ), Tin oxide (SnO) x Indium oxide (InO) x Indium gallium oxide (IGO), indium zinc oxide (IZO), indium tin oxide (ITO), gallium zinc oxide (GZO), zinc magnesium oxide (ZMO), zinc tin oxide (ZTO), zinc zirconium oxide (ZnZr) x O y Indium gallium zinc oxide (IGZO), indium zinc tin oxide (IZTO), indium gallium hafnium oxide (IGHO), aluminum zinc tin oxide (TAZO), or indium gallium tin oxide (IGTO), etc.

[0071] The insulating structure 120 may include an inorganic insulating layer, an organic insulating layer, or a combination thereof. For example, the inorganic insulating layer may include silicon oxide, silicon nitride, silicon oxynitride, or a combination thereof, and may include insulating metal oxides such as aluminum oxide, tantalum oxide, hafnium oxide, zirconium oxide, or titanium oxide. For example, the organic insulating layer may include organic insulating materials such as phenolic resins, acrylic resins, polyimide resins, polyamide resins, siloxane resins, or epoxy resins.

[0072] For example, after forming an insulating structure 120 with contact holes, a conductive layer is formed on the insulating structure 120. The conductive layer is patterned by a process such as photolithography to form patterned electrodes PE1, PE2, and PE3.

[0073] The conductive layer may include metals, metal alloys, metal oxides, or combinations thereof. For example, the conductive layer may have a multilayer structure comprising metal oxide layers including indium tin oxide, indium zinc oxide, zinc tin oxide, indium oxide, zinc oxide, or tin oxide, and metal layers including gold (Au), silver (Ag), aluminum (Al), copper (Cu), nickel (Ni), platinum (Pt), magnesium (Mg), chromium (Cr), tungsten (W), molybdenum (Mo), or titanium (Ti).

[0074] For example, the patterned electrodes PE1, PE2 and PE3 may include a reflective layer containing gold (Au), silver (Ag), aluminum (Al), copper (Cu), nickel (Ni), platinum (Pt), magnesium (Mg), chromium (Cr), tungsten (W), molybdenum (Mo) or titanium (Ti), an upper transmissive conductive layer disposed on the reflective layer and comprising a transparent metal oxide, and a lower transmissive conductive layer disposed below the reflective layer and comprising a transparent metal oxide.

[0075] Referring to Figure 5, a resonant tuning pattern SP is formed on the first patterned electrode PE1.

[0076] The resonant tuning pattern SP comprises a transparent conductive material. For example, the resonant tuning pattern SP may comprise indium tin oxide, indium zinc oxide, zinc tin oxide, indium oxide, zinc oxide, tin oxide, or combinations thereof.

[0077] Referring to Figure 6, a pixel defining layer PDL is formed on the insulating structure 120. The pixel defining layer PDL may have openings OP1, OP2, and OP3 that expose at least a portion of the upper surfaces of the resonant modulation pattern SP, the second pattern electrode PE2, and the third pattern electrode PE3.

[0078] For example, a photoresist composition including phenolic resin, acrylic resin, polyimide resin, polyamide resin, siloxane resin or epoxy resin can be coated on insulating structure 120, exposed and developed to form a pixel defining layer (PDL) having openings OP1, OP2 and OP3.

[0079] Referring to Figure 7, a hole transport layer (HTL) is formed. The hole transport layer (HTL) is formed as a common layer disposed on the pixel limiting layer (PDL), the resonant modulation pattern (SP), the second pattern electrode (PE2), and the third pattern electrode (PE3).

[0080] Hole transport layer (HTL) can have a variety of conventionally known configurations. For example, HTL can include a variety of conventionally known hole transport materials, hole injection materials, or combinations thereof.

[0081] For example, the hole transport layer (HTL) may include a hole transport region and a hole injection region. The hole injection region may be located between the hole transport region and the patterned electrodes PE1, PE2, and PE3.

[0082] The hole transport region may include hole transport materials. For example, the hole transport region may include carbazole derivatives such as N-phenylcarbazole or polyvinylcarbazole, fluorene derivatives, triphenylamine derivatives such as TPD (N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine) or TCTA (4,4',4"-tris(N-carbazolyl)triphenylamine), NPB (N,N'-bis(1-naphthyl)-N,N'-diphenylbenzidine) or TAPC (4,4'-cyclohexylenebis[N,N-bis(4-methylphenyl)aniline]), etc.

[0083] The hole injection region may include a hole injection material. For example, the hole injection region may include materials such as copper phthalocyanine, DNTPD (N,N'-diphenyl-N,N'-bis-[4-(phenyl-m-tolyl-amino)-phenyl]-biphenyl-4,4'-diamine), m-MTDATA (4,4',4"-tris(3-methylphenylphenylamino)triphenylamine), TDATA (4,4',4"-tris(N,N-diphenylamino)triphenylamine), 2-TNATA (4,4',4"-tri{N-(2 Phthalocyanine compounds such as (-naphthyl)-N-phenylamino}-triphenylamine, HATCN (1,4,5,8,9,12-hexaazatriphenylhexanitrile), PEDOT / PSS (poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate)), PANI / DBSA (polyaniline / dodecylbenzenesulfonic acid), PANI / CSA (polyaniline / camphorsulfonic acid) or PANI / PSS ((polyaniline) / poly(4-styrenesulfonate)).

[0084] For example, the hole injection region may further include a charge-generating material. For example, the charge-generating material may be a p-type dopant. For example, a p-type dopant may include quinone derivatives such as TCNQ (tetracyanoquinone dimethane) or F4-TCNQ (2,3,5,6-tetrafluoro-tetracyanoquinone dimethane), or metal oxides such as tungsten oxide or molybdenum oxide.

[0085] Depending on the requirements, the hole transport layer (HTL) may further include hole buffers or electron blocking regions, etc.

[0086] Referring to Figure 8, a light-emitting pattern LP is formed on the hole transport layer HTL that overlaps with the third patterned electrode PE3.

[0087] For example, a mask MK with an opening is disposed above a hole transport layer HTL, and luminescent material is deposited on the hole transport layer HTL through the opening to form a luminescent pattern LP. For example, the mask MK can be a fine metal mask.

[0088] In an embodiment, the luminescent pattern LP may include a body and a blue dopant.

[0089] As examples, the main body may include Alq3 (tris(8-hydroxyquinoline)aluminum), CBP (4,4'-bis(N-carbazolyl)-1,1'-biphenyl), PVK (poly(N-vinylcarbazole)), AND (9,10-bis(naphthyl-2-yl)anthracene), TCTA (4,4',4”-tris(carbazolyl-9-yl)-triphenylamine), TPBi (1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene), TBADN (3-tert-butyl-9,10-bis(naphthyl-2-yl)anthracene), DSA (diphenylethyl) Alkenylaryl), CDBP (4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl), MADN (2-methyl-9,10-bis(naphthyl-2-yl)anthracene), DPEPO (bis[2-(diphenylphosphino)phenyl] ether oxide), CP1 (hexaphenylcyclotriphosphononitrile), UGH2 (1,4-bis(triphenylsilyl)benzene), DPSiO3 (hexaphenylcyclotrisiloxane), DPSiO4 (octaphenylcyclotetrasiloxane), or PPF (2,8-bis(diphenylphosphino)dibenzofuran), etc.

[0090] For example, blue dopants can include (4,6-F2ppy)2Irpic, etc.

[0091] Referring to Figure 9, a common light-emitting layer (CEL) is formed on the hole transport layer (HTL) and the light-emitting pattern (LP), and an electron transport layer (ETL) is formed on the common light-emitting layer (CEL).

[0092] In an embodiment, the common light-emitting layer (CEL) may include a substrate and dopants for generating yellow light. For example, the common light-emitting layer (CEL) may include red and green dopants.

[0093] For example, red dopants may include PtOEP (octaethylporphyrin platinum(II)), Ir(piq)3 (tris(2-phenylisoquinoline)iridium) or Btp2Ir(acac) (bis(2-(2'-benzothiophene)-pyridyl-N,C3')(acetylacetone)iridium), etc.

[0094] For example, green dopants may include Ir(ppy)3 (tris(2-phenylpyridine)iridium), Ir(ppy)2(acac) (bis(2-phenylpyridine)(acetylacetone)iridium(III)), Ir(mppy)3 (tris(2-(4-tolyl)phenylpyridine)iridium) or C545T (10-(2-benzothiazolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-benzopyran[6,7,8-ij]-quinazolin-11-one), etc.

[0095] In one embodiment, the common light-emitting layer (CEL) may include a yellow dopant.

[0096] Electron transport layer (ETL) can have a variety of conventionally known configurations. For example, an ETL can include a variety of conventionally known electron transport materials, electron injection materials, or combinations thereof.

[0097] For example, the electron transport layer (ETL) may include an electron transport region and an electron injection region. The electron injection region may be disposed between the electron transport region and the common electrode (CE) formed on the electron transport layer (ETL).

[0098] The electron transport region may include known electron transport materials.

[0099] For example, the electron transport region may include Alq3 (tris(8-hydroxyquinoline)aluminum), TPBi (1,3,5-tris(1-phenyl-1H-benzis[d]imidazol-2-yl)phenyl), BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), Bphen (4,7-diphenyl-1,10-phenanthroline), TAZ (3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole), NTAZ (4-(naphthyl-1-yl)-3,5-diphenyl-4H-1,2,4-triazole). t Bu-PBD (2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), BAlq (bis(2-methyl-8-quinolinyl-N1,O8)-(1,1'-biphenyl-4-hydroxy)aluminum), Bebq2 (bis(benzoquinoline-10-hydroxy)beryllium) or ADN (9,10-bis(naphthyl-2-yl)anthracene), etc.

[0100] For example, the electron-injection region may include LiF, LiQ (lithium quinoline), Li2O, BaO, NaCl, CsF, lanthanides such as Yb, or metal halides such as RbCl or RbI.

[0101] Subsequently, as shown in Figure 1, a common electrode CE is formed on the electron transport layer ETL, a capping layer CPL is formed on the common electrode CE, and an encapsulation layer 200 is formed on the capping layer CPL.

[0102] The common electrode CE can include a metal, a metal oxide, a metal fluoride, or a combination thereof. For example, the common electrode CE can include lithium (Li), calcium (Ca), silver (Ag), aluminum (Al), magnesium (Mg), indium tin oxide, indium zinc oxide, zinc tin oxide, indium oxide, zinc oxide, or tin oxide. In an embodiment, the common electrode CE can include a silver-magnesium alloy.

[0103] The capping layer CPL may include inorganic and / or organic materials. For example, inorganic materials may include zinc oxide, tantalum oxide, zirconium oxide, or titanium oxide. Organic materials may include poly(3,4-ethylenedioxythiophene) (PEDOT), 4,4'-bis[N-(3-methylphenyl-N-phenylamino)]biphenyl (TPD), 4,4',4”-tris[(3-methylphenyl)phenylamino]triphenylamine (m-MTDATA), 1,3,5-tris[N,N-bis(2-methylphenyl)-amino]benzene (o-MTDAB), or 1,3,5-tris[N,N-bis(3-methylphenyl)-amino]benzene (m-MTDAB), etc.

[0104] The encapsulation layer 200 may include a stacked structure of organic and inorganic thin films. For example, the encapsulation layer 200 may include two inorganic thin films and an organic thin film disposed between the inorganic thin films. However, the embodiments are not limited thereto. The encapsulation layer 200 may have a structure including at least two organic thin films and at least three inorganic thin films.

[0105] For example, organic films may include cured polymers such as polyacrylates. For example, cured polymers may be formed by the crosslinking reaction of monomers. For example, inorganic films may include silicon oxide, silicon nitride, silicon carbide, aluminum oxide, tantalum oxide, hafnium oxide, zirconium oxide, or titanium oxide.

[0106] According to the embodiments, the number of masks required to form the organic light-emitting structure (OL) can be reduced. Furthermore, the allowance for preventing pattern overlap can be minimized, thereby increasing the aperture ratio, and light-emitting regions with various shapes can be designed.

[0107] Figures 10 to 12 are plan views illustrating an organic light-emitting display device according to an embodiment of the present invention.

[0108] Referring to Figure 10, the organic light-emitting display device may include a first light-emitting region LA1 that emits a first color light, a second light-emitting region LA2 that emits a second color light, and a third light-emitting region LA3 that emits a third color light. In an embodiment, the first light-emitting region LA1 may emit red light, the second light-emitting region LA2 may emit green light, and the third light-emitting region LA3 may emit blue light.

[0109] In this embodiment, the first light-emitting region LA1 and the third light-emitting region LA3 may each have a rhomboid shape, and the second light-emitting region LA2 may have a rectangular shape. For example, the first pixel distance PG1 between the first light-emitting region LA1 and the second light-emitting region LA2 may be smaller than the second pixel distance PG2 between the second light-emitting region LA2 and the third light-emitting region LA3. For example, the ratio of the first pixel distance PG1 to the second pixel distance PG2 may be from 1:2 to 1:10.

[0110] Referring to Figure 11, the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3 can have a rectangular shape. In an embodiment, the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3 can be arranged along one direction.

[0111] Referring to Figure 12, the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3 can have a rectangular shape. The first light-emitting region LA1 can be spaced apart from the second light-emitting region LA2 along a first direction. The third light-emitting region LA3 can be spaced apart from the first light-emitting region LA1 and the second light-emitting region LA2 along a second direction perpendicular to the first direction.

[0112] Figures 13 and 14 are cross-sectional views illustrating a method for manufacturing an organic light-emitting display device according to an embodiment of the present invention.

[0113] Referring to Figures 13 and 14, a resonance modulation pattern SP can be formed after the pixel-defining layer PDL is formed. For example, a portion of the resonance modulation pattern SP can be disposed on the upper surface of the pixel-defining layer PDL.

[0114] The resonance modulation pattern SP can be formed using a photolithography process. However, the embodiments are not limited to this, and the resonance modulation pattern SP can be formed using a fine metal mask.

[0115] The organic light-emitting structure OL, common electrode CE, capping layer CPL, and encapsulation layer 200 formed on the resonant tuning pattern SP can have the same configuration as previously explained above.

[0116] Figure 15 is a cross-sectional view showing an organic light-emitting display device according to an embodiment of the present invention.

[0117] Referring to Figure 15, the organic light-emitting display device may include a first light-emitting region LA1 that emits a first color light, a second light-emitting region LA2 that emits a second color light, and a third light-emitting region LA3 that emits a third color light. In an embodiment, the first light-emitting region LA1 may emit green light G, the second light-emitting region LA2 may emit blue light B, and the third light-emitting region LA3 may emit red light R.

[0118] The organic light-emitting display device includes driving elements TR1, TR2 and TR3, patterned electrodes PE1, PE2 and PE3 electrically connected to the driving elements TR1, TR2 and TR3, an organic light-emitting structure OL disposed on the patterned electrodes PE1, PE2 and PE3, and a common electrode CE disposed on the organic light-emitting structure OL.

[0119] An organic light-emitting structure (OL) may include a hole transport layer (HTL), a light-emitting layer, and an electron transport layer (ETL). In an embodiment, the light-emitting layer includes a light-emitting pattern (LP) and a common light-emitting layer (CEL).

[0120] In an embodiment, the hole transport layer HTL, the common light-emitting layer CEL, and the electron transport layer ETL can be formed as a common layer extending continuously within the organic light-emitting structure OL. A light-emitting pattern LP can be selectively formed in the corresponding light-emitting region to have a patterned shape. In an embodiment, the light-emitting pattern LP can overlap with the third light-emitting region LA3 that emits red light R, but may not overlap with the first light-emitting region LA1 and the second light-emitting region LA2.

[0121] For example, the organic light-emitting structure OL in the first light-emitting region LA1 may include a hole transport layer HTL, a common light-emitting layer CEL, and an electron transport layer ETL. The organic light-emitting structure OL in the second light-emitting region LA2 may include a hole transport layer HTL, a common light-emitting layer CEL, and an electron transport layer ETL. The organic light-emitting structure OL in the third light-emitting region LA3 may include a hole transport layer HTL, a light-emitting pattern LP, a common light-emitting layer CEL, and an electron transport layer ETL.

[0122] In one embodiment, the common emitting layer (CEL) can generate cyan light. For example, cyan light can have a first peak corresponding to green light and a second peak corresponding to blue light. In another embodiment, cyan light can have a broad spectrum containing the maximum intensity in the cyan region. The emitting pattern (LP) can generate red light (R). For example, the common emitting layer (CEL) can include a substrate, a blue dopant, and a green dopant, and the emitting pattern (LP) can include a substrate and a red dopant.

[0123] The thickness of the organic light-emitting structure OL can be determined by the resonant thickness of the light emitted by the light-emitting regions LA1, LA2 and LA3.

[0124] For example, the thicknesses of the hole transport layer HTL, the common light-emitting layer CEL, and the electron transport layer ETL can be adjusted such that the sum of the thicknesses of the hole transport layer HTL, the common light-emitting layer CEL, and the electron transport layer ETL (if the patterned electrode includes an upper transmission conductive layer, the sum may further include the thickness of the upper transmission conductive layer) is the same as the resonant thickness t2 of the blue light B emitted from the second light-emitting region LA2. Therefore, even if the organic light-emitting structure OL generates cyan light in the second light-emitting region LA2, it can still emit blue light B from the second light-emitting region LA2 through the resonant effect.

[0125] A resonant modulation pattern SP is disposed in the first light-emitting region LA1, between the organic light-emitting structure OL and the first patterned electrode PE1. The resonant modulation pattern SP comprises a transparent conductive material. The thickness of the resonant modulation pattern SP can be adjusted such that the distance between the common electrode CE and the first patterned electrode PE1, or the distance between the common electrode CE and the reflective layer of the first patterned electrode PE1, corresponds to the resonant thickness t1 of the green light G. Therefore, even if the organic light-emitting structure OL generates cyan light in the first light-emitting region LA1, green light G can still be emitted from the first light-emitting region LA1 through the resonant effect.

[0126] The luminescent pattern LP is disposed in the third luminescent region LA3. The thickness of the luminescent pattern LP can be adjusted so that the distance between the common electrode CE and the third pattern electrode PE3, or the distance between the reflective layer of the common electrode CE and the third pattern electrode PE3, corresponds to the resonant thickness t3 of the red light R. Therefore, even if the organic light-emitting structure OL includes a common luminescent layer CEL that generates cyan light in the third luminescent region LA3, red light R can be selectively emitted from the third luminescent region LA3.

[0127] As explained above, the present invention may include various embodiments in which the setting and configuration of the resonant modulation pattern, the light emission pattern and the common light emission layer are changed.

[0128] The foregoing is illustrative of the embodiments and should not be construed as limiting them. Therefore, it should be understood that the foregoing is illustrative of various embodiments and should not be construed as limiting oneself to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims.

[0129] [Industrial Applicability]

[0130] This invention can be applied to various display devices. For example, it can be applied to vehicle display devices, ship display devices, aircraft display devices, portable communication devices, display devices for display or information transmission, medical display devices, etc.

Claims

1. An organic light-emitting display device having a plurality of light-emitting regions that emit light of different colors from each other, the organic light-emitting display device comprising: A first patterned electrode, a second patterned electrode, and a third patterned electrode, each of which is connected to a driving electrode; An organic light-emitting structure is disposed on the first patterned electrode, the second patterned electrode, and the third patterned electrode; a common electrode is disposed on the organic light-emitting structure; The resonant modulation pattern is disposed between the first pattern electrode and the organic light-emitting structure, overlapping with the first light-emitting region of the plurality of light-emitting regions that overlaps with the first pattern electrode, and includes a conductive oxide. The organic light-emitting structure includes a hole transport layer, a light-emitting layer, and an electron transport layer. The light-emitting layer includes a common light-emitting layer that extends continuously in the organic light-emitting structure and a light-emitting pattern that overlaps with the third pattern electrode. The first light-emitting region emits a first color light, the second light-emitting region of the plurality of light-emitting regions that overlaps with the second pattern electrode emits a second color light that is different from the first color light, and the third light-emitting region of the plurality of light-emitting regions that overlaps with the light-emitting pattern emits a third color light that is different from the first color light and the second color light. The common light-emitting layer includes a dopant that generates the first color light and the second color light.

2. The organic light-emitting display device according to claim 1, wherein, Each of the first patterned electrode, the second patterned electrode, and the third patterned electrode includes a reflective layer, wherein the distance between the common electrode and the reflective layer of the first patterned electrode is the same as or close to the resonant thickness of the first color light, wherein the distance between the common electrode and the reflective layer of the second patterned electrode is the same as or close to the resonant thickness of the second color light, and wherein the distance between the common electrode and the reflective layer of the third patterned electrode is the same as or close to the resonant thickness of the third color light.

3. The organic light-emitting display device according to claim 1, wherein, The first color light is red light, the second color light is green light, and the third color light is blue light.

4. The organic light-emitting display device according to claim 3, wherein, The common light-emitting layer produces yellow light, and the light-emitting pattern produces blue light.

5. The organic light-emitting display device according to claim 4, wherein, The common light-emitting layer includes green dopant and red dopant.

6. The organic light-emitting display device according to claim 4, wherein, The common light-emitting layer includes a yellow dopant.

7. The organic light-emitting display device according to claim 1, wherein, The first color light is green, the second color light is blue, and the third color light is red.

8. The organic light-emitting display device according to claim 7, wherein, The common light-emitting layer produces cyan light, and the light-emitting pattern produces red light.

9. The organic light-emitting display device according to any one of claims 1 to 8, wherein, The luminescent pattern is disposed between the common luminescent layer and the hole transport layer.

10. The organic light-emitting display device according to any one of claims 1 to 8, further comprising: A pixel defining layer has an opening that overlaps with the first patterned electrode, the second patterned electrode, and the third patterned electrode, wherein a portion of the resonant modulation pattern is disposed beneath the pixel defining layer.

11. The organic light-emitting display device according to any one of claims 1 to 8, further comprising: A pixel defining layer has an opening that overlaps with the first patterned electrode, the second patterned electrode and the third patterned electrode, wherein a portion of the resonant modulation pattern is disposed on the pixel defining layer.

12. The organic light-emitting display device according to any one of claims 1 to 8, wherein, The resonance modulation pattern includes at least one selected from the group consisting of indium tin oxide, indium zinc oxide, zinc tin oxide, indium oxide, zinc oxide, and tin oxide.

13. A method for manufacturing an organic light-emitting display device, the method comprising: A first patterned electrode, a second patterned electrode, and a third patterned electrode are formed, and each of the first patterned electrode, the second patterned electrode, and the third patterned electrode is connected to a driving element; A resonant tuning pattern comprising conductive oxides is formed on the first patterned electrode; A hole transport layer is formed on the resonant modulation pattern, the second pattern electrode, and the third pattern electrode; A light-emitting pattern overlapping with the third patterned electrode is formed on the hole transport layer; a common light-emitting layer is formed on the hole transport layer; and an electron transport layer is formed on the common light-emitting layer. A common electrode is formed on the electron transport layer, wherein a first light-emitting region overlapping with the first patterned electrode emits a first color light, a second light-emitting region overlapping with the second patterned electrode emits a second color light different from the first color light, and a third light-emitting region overlapping with the light-emitting pattern emits a third color light different from the first color light and the second color light, and the common light-emitting layer includes a dopant that generates the first color light and the second color light.

14. The method according to claim 13, wherein, Each of the first patterned electrode, the second patterned electrode, and the third patterned electrode includes a reflective layer, wherein the distance between the common electrode and the reflective layer of the first patterned electrode is the same as or close to the resonant thickness of the first color light, wherein the distance between the common electrode and the reflective layer of the second patterned electrode is the same as or close to the resonant thickness of the second color light, and wherein the distance between the common electrode and the reflective layer of the third patterned electrode is the same as or close to the resonant thickness of the third color light.

15. The method according to claim 14, wherein, The first color light is red light, the second color light is green light, and the third color light is blue light.

16. The method according to claim 15, wherein, The common light-emitting layer includes dopants for generating yellow light, and the light-emitting pattern includes dopants for generating blue light.

17. The method according to claim 14, wherein, The first color light is green, the second color light is blue, and the third color light is red.

18. The method according to claim 17, wherein, The common light-emitting layer includes dopants for generating cyan light, and the light-emitting pattern includes dopants for generating red light.

19. The method according to any one of claims 13 to 18, wherein, The resonance modulation pattern is formed by photolithography.

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