US20130161656A1 - Organic light-emitting display apparatus and method of manufacturing the same - Google Patents
Organic light-emitting display apparatus and method of manufacturing the same Download PDFInfo
- Publication number
- US20130161656A1 US20130161656A1 US13/443,820 US201213443820A US2013161656A1 US 20130161656 A1 US20130161656 A1 US 20130161656A1 US 201213443820 A US201213443820 A US 201213443820A US 2013161656 A1 US2013161656 A1 US 2013161656A1
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- Prior art keywords
- electrode
- capping layer
- organic light
- display apparatus
- emitting display
- Prior art date
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- Abandoned
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/124—Insulating layers formed between TFT elements and OLED elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
- H10K2102/3023—Direction of light emission
- H10K2102/3026—Top emission
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/351—Thickness
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
Definitions
- the following description relates to an organic light-emitting display apparatus and a method of manufacturing the same.
- Flat panel display apparatuses are thin and portable display apparatuses.
- organic light-emitting display apparatuses are self-emissive display apparatuses which have wide viewing angles, excellent contrast, and high response speeds.
- the organic light-emitting display apparatuses are being recognized (noticed) as next-generation display apparatuses.
- An organic light-emitting display apparatus includes an intermediate layer, a first electrode, and a second electrode.
- the intermediate layer includes an organic emissive layer, and when a voltage is applied to the first and second electrodes, the organic emissive layer produces visible rays.
- the second electrode may be polluted or damaged.
- aspects of embodiments of the present invention are directed toward an organic light-emitting display apparatus having improved electrical characteristics and/or image quality, and a method of manufacturing the organic light-emitting display apparatus.
- an organic light-emitting display apparatus including: a substrate; a plurality of pixels that are formed on the substrate and each have a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted; a pixel circuit portion disposed in each light emission area of the plurality of pixels; a first electrode that is disposed in each light emission area and is electrically connected to the pixel circuit portion; an intermediate layer that is formed on the first electrode and includes an organic emissive layer; a second electrode formed on the intermediate layer; and a capping layer that is disposed on the second electrode and includes a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area.
- the capping layer may be light-transmissive.
- the first capping layer and the second capping layer may have different thicknesses.
- the second capping layer may be thinner than the first capping layer.
- the second capping layer may include a plurality of sub-capping layers.
- the first capping layer and the second capping layer may be separated from each other in at least a first direction and a second direction perpendicular to the first direction (or in at least one area).
- the first capping layer and the second capping layer may include the same material.
- the first capping layer and the second capping layer may include different materials.
- the capping layer may comprise 8-quinolinolato lithium (Liq), N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, N(diphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, or 2-(4-(9,10-di(naphthalene-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole.
- Liq 8-quinolinolato lithium
- N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine N(diphenyl-4-yl)9,9-dimethyl-
- the second electrode may be light-transmissive.
- the capping layer may be formed on the second electrode in a first area and has a first edge
- the organic light-emitting display apparatus may further include a third electrode that is formed on the second electrode in a second area other than the first area (or in an entire top surface area of the second electrode except the first area) and has a second edge, and a lateral surface of the first edge of the capping layer and a lateral surface of the second edge of the third electrode contact each other.
- the third electrode may be is thicker than the second electrode.
- An adhesive force between the third electrode and the capping layer may be weaker than an adhesive force between the third electrode and the second electrode.
- the third electrode may comprise magnesium (Mg).
- All edges of the capping layer and an edge of the third electrode may contact each other.
- an organic light-emitting display apparatus including a plurality of pixels each including a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted, the method comprising: forming a plurality of pixel circuit portions on a substrate to respectively correspond to the plurality of pixels; forming a first electrode that is disposed in a light emission area of each of the plurality of pixels and is electrically connected to a corresponding one of the pixel circuit portions; forming an intermediate layer, including an organic emissive layer, on the first electrode; forming a second electrode on the intermediate layer; and forming a capping layer on the second electrode, wherein the capping layer comprises a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area.
- the first capping layer and the second capping layer may be formed separately.
- the first capping layer and the second capping layer may be formed using a mask.
- the capping layer may be formed in a first area on the second electrode and have a first edge
- the method may further include forming a third electrode that is formed in a second area other than the first area on the second electrode and has a second edge, and a lateral surface of the first edge of the capping layer and a lateral surface of the second edge of the third electrode are formed to contact each other.
- the forming of the third electrode may comprise patterning the third electrode by using a pattern of the capping layer.
- FIG. 1 is a cross-sectional view illustrating an organic light-emitting display apparatus according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view illustrating an organic light-emitting display apparatus according to another embodiment of the present invention.
- FIG. 3 is a plan view illustrating an organic light-emitting unit of FIG. 1 ;
- FIG. 4 is a cross-sectional view illustrating a pixel of FIG. 3 ;
- FIG. 5 is a detailed plan view of a capping layer of the organic light-emitting unit of FIG. 1 , according to an embodiment of the present invention
- FIG. 6 is a plan view of a capping layer of the organic light-emitting unit, according to another embodiment of the present invention.
- FIG. 7 is a plan view of a capping layer of the organic light-emitting unit, according to another embodiment of the present invention.
- FIG. 8 is a plan view illustrating an organic light-emitting unit according to another embodiment of the present invention.
- FIG. 9 is a graph showing light transmittance according to thickness of a capping layer.
- FIG. 1 is a cross-sectional view illustrating an organic light-emitting display apparatus 2 according to an embodiment of the present invention.
- the organic light-emitting display apparatus 2 includes a substrate 1 , an organic light-emitting unit 21 formed on the substrate 1 , and an encapsulation substrate 23 that encapsulates the organic light-emitting unit 21 .
- the encapsulation substrate 23 includes a transparent material so that visible rays generated by the organic light-emitting unit 21 may transmit therethrough, and prevents (blocks) penetration of external air and water into the organic light-emitting unit 21 .
- the substrate 1 and the encapsulation substrate 23 are coupled using a sealing member 24 so that space 25 between the substrate 1 and the encapsulation substrate 23 is encapsulated.
- a moisture absorbing material or filler may be included in the space 25 .
- FIG. 2 is a cross-sectional view illustrating an organic light-emitting display apparatus 2 according to another embodiment of the present invention.
- a thin encapsulation layer 26 may be formed on an organic light-emitting unit 21 , as illustrated in FIG. 2 , to protect the organic light-emitting unit 21 from external air.
- the encapsulation layer 26 may have a structure in which an inorganic layer formed of silicon oxide or silicon nitride or the like and an organic layer formed of epoxy or polyimide or the like are alternately stacked, but is not limited thereto. Any encapsulation structure that is a thin transparent layer may be used.
- FIG. 3 is a plan view illustrating the organic light-emitting unit 21 of FIG. 1
- FIG. 4 is a cross-sectional view illustrating a pixel of FIG. 3 .
- the organic light-emitting unit 21 is divided into a transmission area TA through which external light is transmitted and a plurality of light emission areas PA that are adjacent to the transmission area TA.
- a pixel circuit portion PC is included and a plurality of conductive lines, such as a scan line S, a data line D, and a Vdd line V, are electrically connected to the pixel circuit portion PC.
- conductive lines such as a scan line S, a data line D, and a Vdd line V
- other conductive lines besides the scan line S, the data line D, and the Vdd line V may be included according to the configuration of the pixel circuit portion PC.
- the pixel circuit portion PC may include at least one thin film transistor connected to the scan line S and the data line D, a thin film transistor connected to the Vdd line C, or the like, and a capacitor.
- the thin film transistors of the pixel circuit portion PC may include a switching transistor and a driving transistor.
- the thin film transistors of the pixel circuit portion PC may be either p-type or n-type transistor, and the number of capacitors of the pixel circuit portion PC may vary.
- the scan line S overlaps with a first electrode 221 .
- the embodiment of the present invention is not limited thereto, and at least one of the plurality of conductive lines, such as the scan line S, the data line D, and the Vdd line V, may be disposed to overlap with the first electrode 221 , and also, according to circumstances, all of the plurality of conductive lines, such as the scan line S, the data line D, and the Vdd line V, may overlap with the first electrode 221 or may be disposed next to the first electrode 221 .
- a buffer layer 211 is formed on a substrate 1 , and a thin film transistor TR 1 is formed on the buffer layer 211 .
- a semiconductor active layer 212 is formed on the buffer layer 211 .
- the buffer layer 211 prevents penetration of impurities into the substrate 1 and provides a planar surface over the substrate 1 .
- the buffer layer 211 may be formed of any materials that may perform these functions.
- the buffer layer 211 may include an inorganic material, such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or an organic material such as polyimide, polyester, or acryl, and may also be formed of a stack structure of such materials.
- the buffer layer 211 is not an essential component and may be omitted when suitable.
- the semiconductor active layer 212 may be formed of polycrystalline silicon, but is not limited thereto, and may be formed of an oxide semiconductor.
- the semiconductor active layer 212 may be a G-I-Z-O layer [(In 2 O 3 )a(Ga 2 O 3 )b(ZnO)c layer](where a, b, and c respectively satisfy a ⁇ 0, b ⁇ 0, c>0).
- a gate insulating layer 213 is formed on the buffer layer 211 to cover the semiconductor active layer 212 , and a gate electrode 214 is formed on the gate insulating layer 213 .
- An interlayer insulating layer 215 is formed to cover the gate electrode 214 .
- a source electrode 216 and a drain electrode 217 are formed on the interlayer insulating layer 215 to be electrically connected to the semiconductor active layer 212 .
- the thin film transistor TR 1 is not limited to the above-described structure, and other thin film transistor structures may be applied.
- the thin film transistor TR 1 described above has a top gate structure, but the thin film transistor TR 1 may also have a bottom gate structure in which the gate electrode 214 is disposed below the semiconductor active layer 212 .
- other thin film transistor structures may be used.
- a passivation layer 218 is formed on the interlayer insulating layer 215 to cover the pixel circuit portion PC including the thin film transistor TR 1 .
- the passivation layer 218 may be a single insulating layer or a plurality of insulating layers having a planarized upper surface.
- the passivation layer 218 may be formed of an inorganic and/or organic material.
- a first electrode 221 that is electrically connected to the thin film transistor TR 1 is formed on the passivation layer 218 .
- the first electrode 221 is formed to be in an independent island form in each pixel.
- a pixel-defining layer 219 is formed on the passivation layer 218 to cover an edge of the first electrode 221 .
- An opening 219 a is formed in the pixel-defining layer 219 to expose a central portion of the first electrode 221 except the edge thereof.
- An intermediate layer 220 including an organic emissive layer, is formed on the exposed central portion of the first electrode 221 , and a second electrode 222 is formed on the intermediate layer 220 to cover the intermediate layer 220 , thereby completing the manufacture of an organic light-emitting device EL.
- the intermediate layer 220 may include a low-molecule or polymer organic layer.
- the intermediate layer 220 may include a hole injection layer (HIL), a hole transport layer (HTL), an organic emissive layer, an electron transport layer (ETL), an electron injection layer (EIL), or the like.
- HIL hole injection layer
- HTL hole transport layer
- ETL electron transport layer
- EIL electron injection layer
- the organic emissive layer is formed in each of red, green, and blue pixels, and the HIL, the HTL, the ETL, and the EIL are common layers that are commonly applied to the red, green, and blue pixels.
- the HIL may be formed of a phthalocyanine compound such as a copper phthalocyanine or a starburst type amine such as TCTA, m-MTDATA, m-MTDAPB or the like.
- a phthalocyanine compound such as a copper phthalocyanine or a starburst type amine such as TCTA, m-MTDATA, m-MTDAPB or the like.
- the HTL may be formed of, for example, N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1-biphenyl]-4,4′-diamine(TPD), N,N′-di(naphthalene-1-il-N,N′-diphenyl benzidine( ⁇ -NPD), or the like.
- the EIL may be formed of, for example, LiF, NaCl, CsF, Li 2 O, BaO, or Liq.
- the ETL may be formed using Alq3.
- the organic emissive layer may include a host material and a dopant material.
- the host material of the organic emissive layer may be, for example, tris(8-hydroxy-quinolinato)aluminum (Alq3), 9,10-di(naphti-2-yl)anthracene (AND), 3-Tert-butyl-9,10-di(naphthi-2-yl)anthracene (TBADN), 4,4′-bis(2,2-diphenyl-ethene-1-yl)-4,4′-dimethylphenyl (DPVBi), 4,4′-bisBis(2,2-diphenyl-ethene-1-yl)-4,4′-dimethylphenyl (p-DMDPVBi), Tert(9,9-diarylfluorene)s (TDAF), 2-(9,9′-spirobifluorene-2-yl)-9,9′-spirobifluorene (BSDF), 2,7-bis(9,9′-spirobifluorene-2-
- the dopant material of the organic emissive layer may be, for example, 4,4′-bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi), 9,10-di(naph-2-tyl)anthracene (ADN), or 3-tert-butyl-9,10-di(naph-2-tyl)anthracene (TBADN).
- DPAVBi 4,4′-bis[4-(di-p-tolylamino)styryl]biphenyl
- ADN 9,10-di(naph-2-tyl)anthracene
- TAADN 3-tert-butyl-9,10-di(naph-2-tyl)anthracene
- the first electrode 221 may function as an anode, and the second electrode 222 may function as a cathode, but the polarities of the first and second electrodes 221 and 222 may be exchanged.
- the first electrode 221 may include a material having a high work function, such as ITO, IZO, ZnO, or In 2 O 3 . Also, according to purpose or design, the first electrode 221 may further include a reflection layer formed of, for example, Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Yb, or Ca.
- the second electrode 222 When the second electrode 222 functions as a cathode electrode, the second electrode 222 may be formed of a metal, such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, or Ca.
- the organic light-emitting display apparatus 2 is a top emissive type display apparatus in which an image is formed away from the substrate 1 , light needs to be transmitted through the second electrode 222 .
- the second electrode 222 may include a transparent metal oxide, such as ITO, IZO, ZnO, or In 2 O 3 .
- the second electrode 222 may be formed as a thin film by using Al, Ag, and/or Mg.
- the second electrode 222 may be formed in a single-layer structure or a stack structure including Mg:Ag and/or Ag. Unlike the first electrode 221 , the second electrode 222 is formed such that a common voltage is applied to each of all pixels thereof, and to this end, the second electrode 222 is formed as a common electrode to all pixels and is not formed of a plurality of patterns to correspond to pixels. Alternatively, the second electrode 222 , which is the common electrode, may also be patterned into a mesh form, from which portions except those corresponding to a light emission area are removed.
- a third electrode 223 that is electrically connected to the second electrode 222 may be further included.
- an upper surface of the second electrode 222 may be damaged by the encapsulation substrate 23 of FIG. 1 .
- the second electrode 222 is likely to be damaged when forming the encapsulation layer 26 .
- the second electrode 222 is likely to be damaged by external air or impurities.
- a capping layer 230 may be formed on the second electrode 222 .
- the capping layer 230 includes a first capping layer 231 and a second capping layer 232 .
- the first capping layer 231 may be formed to correspond to the light emission area PA, and the second capping layer 232 may be formed to correspond to the transmission area TA. Also, the first capping layer 231 and the second capping layer 232 may be formed separately. In more detail, the thicknesses of the first capping layer 231 and the second capping layer 232 may be different, and in particular, a thickness of the second capping layer 232 may be less than that of the first capping layer 231 .
- the capping layer 230 is formed on the second electrode 222 in a first area R 1 and has a first edge 230 a.
- the third electrode 223 is formed on the second electrode 222 in a second area R 2 and has a second edge 223 a.
- the third electrode 223 is adjacent and horizontal to the capping layer 230 .
- the first area R 1 corresponds to the light emission area PA and the transmission area TA in at least one pixel, and an edge of the first area R 1 is the first edge 230 a of the capping layer 230 .
- the second area R 2 corresponds to a portion of the second electrode 222 other than (or except) the first area R 1 , the third electrode 223 is formed over the entire second area R 2 , and an edge of the second area R 2 is the second edge 223 a of the third electrode 223 .
- the second area R 2 is an area except at least the light emission area PA.
- a lateral surface of the first edge 230 a of the capping layer 230 and a lateral surface of the second edge 223 a of the third electrode 223 contact each other.
- the third electrode 223 may preferably be thicker than the second electrode 222 to reduce surface resistance of the second electrode 222 .
- the capping layer 230 may preferably be light-transmissive.
- visible rays transmit through the second capping layer 232 as much as possible without losing optical characteristics, and thus, transmittance of the second capping layer 232 may preferably be high.
- the first capping layer 231 may preferably be formed such that visible rays generated by the intermediate layer 220 transmit through the first capping layer 231 and image quality, such as luminance, contrast, color conversion, or the like, are considered at the same time.
- the second capping layer 232 may be thinner than the first capping layer 231 to improve transparency of the transmission area TA and image quality of the light emission area PA.
- the capping layer 230 may be formed as a thin layer that is thinner than the third electrode 223 , but is not limited thereto.
- an adhesive force between the third electrode 223 and the capping layer 230 is set to be weaker than an adhesive force between the third electrode 223 and the second electrode 222 .
- the capping layer 230 may be formed of a material including 8-quinolinolato lithium (Liq), N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, N(diphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, or 2-(4-(9,10-di(naphthalene-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole.
- Liq 8-quinolinolato lithium
- N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine N(diphenyl-4-yl)
- the first capping layer 231 and the second capping layer 232 may be formed using the same material for simplicity of manufacture, but the embodiment of the present invention is not limited thereto, and the first capping layer 231 and the second capping layer 232 may also include different materials.
- the third electrode 223 may be formed of magnesium (Mg).
- Magnesium (Mg) of the third electrode 223 is a metal, and thus, has a good adhesive property with respect to the second electrode 222 . However, Mg is not easily adhered to the material of the capping layer 230 . Thus, the third electrode 223 may be easily patterned by using the adhesive force between the third electrode 223 and the capping layer 230 .
- the third electrode 223 is patterned so that the third electrode 223 is formed only in the second area R 2 .
- the third electrode 223 may not be patterned using a wet process such as a photolithography method which is frequently used as a patterning method of a typical metal layer, because when water and/oxygen penetrates into the intermediate layer 220 in the wet process, the lifespan (lifetime) of the organic light-emitting device EL is abruptly decreased.
- the third electrode 223 may be simply patterned using an adhesive force between the third electrode 223 and the capping layer 230 .
- a method of manufacturing the capping layer 230 will be described in more detail.
- the manufacturing method is the same until forming the second electrode 222 , and then a mask is used to form the capping layer 230 .
- the capping layer 230 may be formed of an organic material described above, and thus, may be formed using a thermal evaporation method using a mask. An opening is formed in the mask to correspond to a pattern of the capping layer 230 .
- the first capping layer 231 and the second capping layer 232 are formed separately. That is, the first capping layer 231 is formed using a mask having an opening corresponding to the first capping layer 231 , and then the second capping layer 232 is formed using a mask having an opening corresponding to the second capping layer 232 .
- the first capping layer 231 and the second capping layer 232 have different sizes, and in this case, the first capping layer 231 and the second capping layer 232 may be formed using different masks.
- the embodiment of the present invention is not limited thereto, and when the first capping layer 231 and the second capping layer 232 are to be formed similarly, the first capping layer 231 may be formed first using a mask, and then the mask may be used to form the second capping layer 232 .
- the first capping layer 231 may be formed after forming the second capping layer 232 .
- an open mask having an overall opening corresponding to all pixels is used to form the third electrode 223 using a material for forming the third electrode 223 .
- the material for forming the third electrode 223 has poor adhesive force with respect to the capping layer 230 , and thus, is not formed on the capping layer 230 , and is formed only on the second electrode 222 , which has a relatively good adhesive force.
- the third electrode 223 may be spontaneously (naturally) patterned at a desired position without an additional patterning operation such as a photolithography method.
- FIG. 5 is a detailed plan view of the capping layer 230 of the organic light-emitting unit 21 of FIG. 1 , according to an embodiment of the present invention.
- the capping layer 230 may be formed to be in an island form in each pixel P.
- the first capping layer 231 and the second capping layer 232 are formed separately, and thus, may be spaced apart from each other.
- the embodiment of the present invention is not limited thereto, and the first capping layer 231 and the second capping layer 232 may be formed adjacent to each other or may overlap by a portion, particularly, edge portions thereof.
- the third electrode 223 is arranged as a lattice pattern between pixels P.
- FIG. 6 is a plan view of a capping layer 230 of the organic light-emitting unit 21 according to another embodiment of the present invention.
- the second capping layer 232 of the capping layer 230 may include sub-capping layers 232 A and 232 B.
- the first capping layer 231 , the sub-capping layer 232 A, and the sub-capping layer 232 B may be sequentially formed.
- the capping layer 230 may be formed by three operations.
- the capping layer 230 may also be formed using a single mask.
- the sub-capping layers 232 A and 232 B of the second capping layer 232 include the above-described materials for forming the capping layer 230 and may be formed of the same material. However, the embodiment of the present invention is not limited thereto, and the sub-capping layers 232 A and 232 B of the second capping layer 232 may also be formed using different materials.
- the capping layer 230 of the organic light-emitting unit 21 of FIG. 1 may be formed to be in an island form in a plurality of pixels P as illustrated in FIG. 7 .
- the third electrode 223 is arranged as a lattice pattern that passes by spaces between the plurality of pixels P.
- the second capping layer 232 of the capping layer 230 may also include a plurality of sub-capping layers, as illustrated in FIG. 6 .
- a material for forming the third electrode 223 may be formed not only in an area except the capping layer 230 , but also as a thin layer that is thinner than the third electrode 223 formed in the area except the capping layer 230 , since the material for forming the third electrode 223 has poor adhesive force with respect to the capping layer 230 . That is, the material should theoretically not form as a layer on the capping layer 230 .
- the material for forming the third electrode 223 is deposited without using an additional patterning mask but using an open mask. Consequently, a very thin layer may be formed on the capping layer 230 in a physically unstable state.
- the material for forming the third electrode 223 which may be formed on the capping layer 230 , is very thin, the material does not have a great influence on the luminance of the organic light-emitting device EL.
- the light emission area PA and the transmission area TA are separate, when observing the outside through the transmission area TA, distortion of external images generated due to diffusion of external light related to patterns of devices in the pixel circuit portion PC may be reduced or prevented.
- the light emission area PA and the transmission area TA are formed such that a ratio of a surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is in a range from about 5% to about 90%.
- the amount of light that is transmitted through the transmission area TA may be small, and thus, a viewer may have difficulty viewing an object or an image on the opposite side of the organic light-emitting display apparatus 2 . That is, the organic light-emitting unit 21 may not be regarded as transparent.
- the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is about 5%, if an intensity of external light is high, a user may sufficiently recognize an object or an image disposed on the opposite side, through the organic light-emitting display apparatus 2 , and thus, the user may regard the organic light-emitting unit 21 as a transparent display unit.
- the thin film transistor of the pixel circuit portion PC is formed as a transparent thin film transistor, such as an oxide semiconductor, and an organic light-emitting device is also formed of a transparent device, the effect of the organic light-emitting display apparatus 2 as a transparent display apparatus may be enhanced.
- the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is greater than 90%, pixel integration of the organic light-emitting unit 21 is too low and images may not be stably formed through light emission of the light emission area PA. That is, the smaller the surface area of the light emission area PA, the higher the need of luminance of light emitted from the intermediate layer 220 . Thus, if an organic light-emitting device is operated in a high luminance mode, the lifespan (lifetime) of the organic light-emitting display apparatus 2 is abruptly decreased.
- the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA may preferably be in a range from 20% to 70%.
- the ratio is less than 20%, the surface area of the light emission area PA is exceedingly greater than that of the transmission area TA, and a user has difficulty viewing images outside through the transmission area TA. In another embodiment, if the ratio exceeds 70%, designing the pixel circuit portion PC, which is to be arranged in the light emission area PA, may be restricted too much.
- the first electrode 221 that is electrically connected to the pixel circuit portion PC is included in the light emission area PA, and the pixel circuit portion PC overlaps with the first electrode 221 so as to be covered by the first electrode 221 .
- at least one of the conductive lines, including the scan line S, the data line D, and the Vdd line V, described above may be arranged to cross the first electrode 221 .
- all of the conductive lines may be disposed adjacent to the first electrode 221 according to design conditions.
- the first electrode 221 includes a reflection layer formed of a conductive metal on which light may be reflected, the first electrode 221 covers the pixel circuit portion PC and reduces or prevents distortion of external images in the light emission area PA due to the pixel circuit portion PC.
- the light emission area PA and the transmission area TA are arranged in the first area R 1 .
- the capping layer 230 is disposed within the first area R 1 , and thus, covers both the light emission area PA and the transmission area TA.
- the third electrode 223 is formed in the second area R 2 outside the first area R 1 .
- a transmission window may be formed by removing a portion of the second electrode 222 from the transmission area TA, thereby further increasing light transmittance of the transmission area TA.
- the transmission window is not limited to being formed by removing a portion of the second electrode 222 and may also be formed on at least one of the pixel-defining layer 219 , the passivation layer 218 , the interlayer insulating layer 215 , the gate insulating layer 213 , and the buffer layer 211 .
- FIG. 8 is a plan view illustrating an organic light-emitting unit according to another embodiment of the present invention.
- each pixel is formed of red, green, and blue sub-pixels so as to emit white light.
- white light may also be generated by using colors other than red, green, and blue colors.
- first through third data lines D 1 through D 3 are electrically connected to the first electrodes 221 a, 221 b, and 221 c of the three sub-pixels. Also, a first Vdd line V 1 is electrically connected to the first electrodes 221 a and 221 b, and a second Vdd line V 2 is electrically connected to the first electrode 221 c.
- one large transmission area TA is included for a plurality of sub-pixels, and thus, transmittance of the entire display apparatus may be further increased and distortion of images due to light diffusion may also be further reduced.
- one large transmission window may also be formed by removing at least a portion of a second electrode from the transmission area TA, as described above.
- the transmission window is not limited to the removed portion of the second electrode but may also be formed on at least one of a pixel-defining layer, a passivation layer, an interlayer insulating layer, a gate insulating layer, and a buffer layer.
- a capping layer and a third electrode are also formed in the embodiment of FIG. 8 described above. That is, a capping layer is formed to correspond to a transmission area and a light emission area, and the third electrode is formed around the capping layer. Also, a first capping layer is formed in the light emission area, and a second capping layer is formed in the transmission area.
- the light emission area of FIG. 8 may be regarded as corresponding to areas of the first electrodes 221 a, 221 b , and 221 c.
- the other detailed configuration is the same as the previous embodiment(s), and thus, description thereof is omitted.
- FIG. 9 is a graph showing light transmittance according to thickness of a capping layer. Referring to FIG. 9 , an area A has a large transmittance, and an area B has a lower light transmittance than the area A.
- the first capping layer 231 and the second capping layer 232 of the capping layer 230 are separately formed.
- Visible rays transmit through the transmission area TA, and transmittance of the second capping layer 232 may preferably be high.
- the second electrode 222 below the second capping layer 232 may preferably be formed such that a thickness of the second capping layer 232 is sufficient to protect the second electrode 222 .
- the second capping layer 232 may have a thickness corresponding to the area A, that is, a range from about 30 ⁇ to about 60 ⁇ .
- the first capping layer 231 may have a thickness corresponding to the area B, that is, a range from about 70 ⁇ to about 90 ⁇ .
- the first capping layer 231 is thicker than the second capping layer 232 .
- the first capping layer 231 and the second capping layer 232 may be each formed to have suitable thicknesses.
- the organic light-emitting display apparatus 2 may suitably vary according to the material of the intermediate layer 220 , and a suitable thickness of the first capping layer 231 may vary accordingly.
- different materials may be determined to form the first capping layer 231 and the second capping layer 232 , and a range of suitable thicknesses thereof may also vary.
- a voltage drop of the second electrode 222 is reduced or prevented by using the third electrode 223 to improve electrical characteristics of the organic light-emitting display apparatus 2 , thereby improving image quality of the organic light-emitting display apparatus 2 .
- the second electrode 222 is protected by using the capping layer 230 to, e.g., completely prevent deterioration of electrical characteristics and image quality of the organic light-emitting display apparatus 2 due to damage of the second electrode 222 .
- the third electrode 223 is easily patterned using the capping layer 230 to increase manufacturing simplicity and prevent damage of the organic light-emitting device EL when forming the third electrode 223 .
- the capping layer 230 includes the first capping layer 231 and the second capping layer 232 , and the first capping layer 231 is formed to correspond to the light emission area PA, and the second capping layer 232 is formed to correspond to the transmission area TA. Accordingly, as many visible rays as possible transmit through the transmission area TA, and suitable images are formed in the light emission area PA.
- the organic light-emitting display apparatus 2 suitable for use as a transparent display apparatus having excellent image quality and transmittance may be easily manufactured.
- organic light-emitting display apparatus According to the organic light-emitting display apparatus and the method of manufacturing the same, electrical characteristics and image quality of the organic light-emitting display apparatus may be easily improved.
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Abstract
An organic light-emitting display apparatus including: a substrate; a plurality of pixels that are formed on the substrate and each have a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted; a pixel circuit portion disposed in each light emission area of the plurality of pixels; a first electrode that is disposed in each light emission area and is electrically connected to the pixel circuit portion; an intermediate layer that is formed on the first electrode and includes an organic emissive layer; a second electrode formed on the intermediate layer; and a capping layer that is disposed on the second electrode and includes a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area. Accordingly, electrical characteristics and image quality of the organic light-emitting display apparatus may be improved.
Description
- This application claims priority to and the benefit of Korean Patent Application No. 10-2011-0141719, filed on Dec. 23, 2011, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
- 1. Field
- The following description relates to an organic light-emitting display apparatus and a method of manufacturing the same.
- 2. Description of the Related Art
- Flat panel display apparatuses are thin and portable display apparatuses. Among the flat panel display apparatuses, organic light-emitting display apparatuses are self-emissive display apparatuses which have wide viewing angles, excellent contrast, and high response speeds. Thus, the organic light-emitting display apparatuses are being recognized (noticed) as next-generation display apparatuses.
- An organic light-emitting display apparatus includes an intermediate layer, a first electrode, and a second electrode. The intermediate layer includes an organic emissive layer, and when a voltage is applied to the first and second electrodes, the organic emissive layer produces visible rays.
- Here, due to a sealing member disposed on the second electrode or other impurities, the second electrode may be polluted or damaged.
- Thus, it is difficult to improve image quality and electrical characteristics of the organic light-emitting display apparatus.
- Aspects of embodiments of the present invention are directed toward an organic light-emitting display apparatus having improved electrical characteristics and/or image quality, and a method of manufacturing the organic light-emitting display apparatus.
- According to an embodiment of the present invention, there is provided an organic light-emitting display apparatus including: a substrate; a plurality of pixels that are formed on the substrate and each have a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted; a pixel circuit portion disposed in each light emission area of the plurality of pixels; a first electrode that is disposed in each light emission area and is electrically connected to the pixel circuit portion; an intermediate layer that is formed on the first electrode and includes an organic emissive layer; a second electrode formed on the intermediate layer; and a capping layer that is disposed on the second electrode and includes a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area.
- The capping layer may be light-transmissive.
- The first capping layer and the second capping layer may have different thicknesses.
- The second capping layer may be thinner than the first capping layer.
- The second capping layer may include a plurality of sub-capping layers.
- The first capping layer and the second capping layer may be separated from each other in at least a first direction and a second direction perpendicular to the first direction (or in at least one area).
- The first capping layer and the second capping layer may include the same material.
- The first capping layer and the second capping layer may include different materials.
- The capping layer may comprise 8-quinolinolato lithium (Liq), N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, N(diphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, or 2-(4-(9,10-di(naphthalene-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole.
- The second electrode may be light-transmissive.
- The capping layer may be formed on the second electrode in a first area and has a first edge, the organic light-emitting display apparatus may further include a third electrode that is formed on the second electrode in a second area other than the first area (or in an entire top surface area of the second electrode except the first area) and has a second edge, and a lateral surface of the first edge of the capping layer and a lateral surface of the second edge of the third electrode contact each other.
- The third electrode may be is thicker than the second electrode.
- An adhesive force between the third electrode and the capping layer may be weaker than an adhesive force between the third electrode and the second electrode.
- The third electrode may comprise magnesium (Mg).
- All edges of the capping layer and an edge of the third electrode may contact each other.
- According to another embodiment of the present invention, there is provided a method of manufacturing an organic light-emitting display apparatus including a plurality of pixels each including a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted, the method comprising: forming a plurality of pixel circuit portions on a substrate to respectively correspond to the plurality of pixels; forming a first electrode that is disposed in a light emission area of each of the plurality of pixels and is electrically connected to a corresponding one of the pixel circuit portions; forming an intermediate layer, including an organic emissive layer, on the first electrode; forming a second electrode on the intermediate layer; and forming a capping layer on the second electrode, wherein the capping layer comprises a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area.
- The first capping layer and the second capping layer may be formed separately.
- The first capping layer and the second capping layer may be formed using a mask.
- The capping layer may be formed in a first area on the second electrode and have a first edge, the method may further include forming a third electrode that is formed in a second area other than the first area on the second electrode and has a second edge, and a lateral surface of the first edge of the capping layer and a lateral surface of the second edge of the third electrode are formed to contact each other.
- The forming of the third electrode may comprise patterning the third electrode by using a pattern of the capping layer.
- The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
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FIG. 1 is a cross-sectional view illustrating an organic light-emitting display apparatus according to an embodiment of the present invention; -
FIG. 2 is a cross-sectional view illustrating an organic light-emitting display apparatus according to another embodiment of the present invention; -
FIG. 3 is a plan view illustrating an organic light-emitting unit ofFIG. 1 ; -
FIG. 4 is a cross-sectional view illustrating a pixel ofFIG. 3 ; -
FIG. 5 is a detailed plan view of a capping layer of the organic light-emitting unit ofFIG. 1 , according to an embodiment of the present invention; -
FIG. 6 is a plan view of a capping layer of the organic light-emitting unit, according to another embodiment of the present invention; -
FIG. 7 is a plan view of a capping layer of the organic light-emitting unit, according to another embodiment of the present invention; -
FIG. 8 is a plan view illustrating an organic light-emitting unit according to another embodiment of the present invention; and -
FIG. 9 is a graph showing light transmittance according to thickness of a capping layer. - The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
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FIG. 1 is a cross-sectional view illustrating an organic light-emittingdisplay apparatus 2 according to an embodiment of the present invention. - Referring to
FIG. 1 , the organic light-emittingdisplay apparatus 2 includes asubstrate 1, an organic light-emittingunit 21 formed on thesubstrate 1, and anencapsulation substrate 23 that encapsulates the organic light-emitting unit 21. - The
encapsulation substrate 23 includes a transparent material so that visible rays generated by the organic light-emittingunit 21 may transmit therethrough, and prevents (blocks) penetration of external air and water into the organic light-emitting unit 21. - The
substrate 1 and theencapsulation substrate 23 are coupled using a sealingmember 24 so thatspace 25 between thesubstrate 1 and theencapsulation substrate 23 is encapsulated. A moisture absorbing material or filler may be included in thespace 25. -
FIG. 2 is a cross-sectional view illustrating an organic light-emittingdisplay apparatus 2 according to another embodiment of the present invention. Instead of theencapsulation substrate 23 ofFIG. 1 , athin encapsulation layer 26 may be formed on an organic light-emittingunit 21, as illustrated inFIG. 2 , to protect the organic light-emittingunit 21 from external air. Theencapsulation layer 26 may have a structure in which an inorganic layer formed of silicon oxide or silicon nitride or the like and an organic layer formed of epoxy or polyimide or the like are alternately stacked, but is not limited thereto. Any encapsulation structure that is a thin transparent layer may be used. -
FIG. 3 is a plan view illustrating the organic light-emittingunit 21 ofFIG. 1 , andFIG. 4 is a cross-sectional view illustrating a pixel ofFIG. 3 . - Referring to
FIGS. 3 and 4 , the organic light-emittingunit 21 is divided into a transmission area TA through which external light is transmitted and a plurality of light emission areas PA that are adjacent to the transmission area TA. - As illustrated in
FIG. 3 , in each of the light emission areas PA, a pixel circuit portion PC is included and a plurality of conductive lines, such as a scan line S, a data line D, and a Vdd line V, are electrically connected to the pixel circuit portion PC. Although not illustrated inFIG. 3 , other conductive lines besides the scan line S, the data line D, and the Vdd line V may be included according to the configuration of the pixel circuit portion PC. - In
FIG. 3 , the pixel circuit portion PC may include at least one thin film transistor connected to the scan line S and the data line D, a thin film transistor connected to the Vdd line C, or the like, and a capacitor. The thin film transistors of the pixel circuit portion PC may include a switching transistor and a driving transistor. Also, the thin film transistors of the pixel circuit portion PC may be either p-type or n-type transistor, and the number of capacitors of the pixel circuit portion PC may vary. - Referring to
FIG. 3 , the scan line S overlaps with afirst electrode 221. However, the embodiment of the present invention is not limited thereto, and at least one of the plurality of conductive lines, such as the scan line S, the data line D, and the Vdd line V, may be disposed to overlap with thefirst electrode 221, and also, according to circumstances, all of the plurality of conductive lines, such as the scan line S, the data line D, and the Vdd line V, may overlap with thefirst electrode 221 or may be disposed next to thefirst electrode 221. - Referring to
FIG. 4 , abuffer layer 211 is formed on asubstrate 1, and a thin film transistor TR1 is formed on thebuffer layer 211. - While only one thin film transistor TR1 is illustrated in
FIG. 4 , the embodiment of the present invention is not limited thereto, as described above, and a plurality of transistors and at least one capacitor may be included in each pixel. - A semiconductor
active layer 212 is formed on thebuffer layer 211. - The
buffer layer 211 prevents penetration of impurities into thesubstrate 1 and provides a planar surface over thesubstrate 1. Thebuffer layer 211 may be formed of any materials that may perform these functions. For example, thebuffer layer 211 may include an inorganic material, such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or an organic material such as polyimide, polyester, or acryl, and may also be formed of a stack structure of such materials. However, thebuffer layer 211 is not an essential component and may be omitted when suitable. - The semiconductor
active layer 212 may be formed of polycrystalline silicon, but is not limited thereto, and may be formed of an oxide semiconductor. For example, the semiconductoractive layer 212 may be a G-I-Z-O layer [(In2O3)a(Ga2O3)b(ZnO)c layer](where a, b, and c respectively satisfy a≧0, b≧0, c>0). - A
gate insulating layer 213 is formed on thebuffer layer 211 to cover the semiconductoractive layer 212, and agate electrode 214 is formed on thegate insulating layer 213. - An interlayer insulating
layer 215 is formed to cover thegate electrode 214. Asource electrode 216 and adrain electrode 217 are formed on theinterlayer insulating layer 215 to be electrically connected to the semiconductoractive layer 212. - The thin film transistor TR1 is not limited to the above-described structure, and other thin film transistor structures may be applied. For example, the thin film transistor TR1 described above has a top gate structure, but the thin film transistor TR1 may also have a bottom gate structure in which the
gate electrode 214 is disposed below the semiconductoractive layer 212. Also, other thin film transistor structures may be used. - A
passivation layer 218 is formed on theinterlayer insulating layer 215 to cover the pixel circuit portion PC including the thin film transistor TR1. Thepassivation layer 218 may be a single insulating layer or a plurality of insulating layers having a planarized upper surface. Thepassivation layer 218 may be formed of an inorganic and/or organic material. - A
first electrode 221 that is electrically connected to the thin film transistor TR1 is formed on thepassivation layer 218. Thefirst electrode 221 is formed to be in an independent island form in each pixel. - A pixel-defining
layer 219 is formed on thepassivation layer 218 to cover an edge of thefirst electrode 221. Anopening 219 a is formed in the pixel-defininglayer 219 to expose a central portion of thefirst electrode 221 except the edge thereof. - An
intermediate layer 220, including an organic emissive layer, is formed on the exposed central portion of thefirst electrode 221, and asecond electrode 222 is formed on theintermediate layer 220 to cover theintermediate layer 220, thereby completing the manufacture of an organic light-emitting device EL. - The
intermediate layer 220 may include a low-molecule or polymer organic layer. When theintermediate layer 220 is formed of a low-molecule organic layer, theintermediate layer 220 may include a hole injection layer (HIL), a hole transport layer (HTL), an organic emissive layer, an electron transport layer (ETL), an electron injection layer (EIL), or the like. The organic emissive layer is formed in each of red, green, and blue pixels, and the HIL, the HTL, the ETL, and the EIL are common layers that are commonly applied to the red, green, and blue pixels. - The HIL may be formed of a phthalocyanine compound such as a copper phthalocyanine or a starburst type amine such as TCTA, m-MTDATA, m-MTDAPB or the like.
- The HTL may be formed of, for example, N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1-biphenyl]-4,4′-diamine(TPD), N,N′-di(naphthalene-1-il-N,N′-diphenyl benzidine(α-NPD), or the like.
- The EIL may be formed of, for example, LiF, NaCl, CsF, Li2O, BaO, or Liq.
- The ETL may be formed using Alq3.
- The organic emissive layer may include a host material and a dopant material.
- The host material of the organic emissive layer may be, for example, tris(8-hydroxy-quinolinato)aluminum (Alq3), 9,10-di(naphti-2-yl)anthracene (AND), 3-Tert-butyl-9,10-di(naphthi-2-yl)anthracene (TBADN), 4,4′-bis(2,2-diphenyl-ethene-1-yl)-4,4′-dimethylphenyl (DPVBi), 4,4′-bisBis(2,2-diphenyl-ethene-1-yl)-4,4′-dimethylphenyl (p-DMDPVBi), Tert(9,9-diarylfluorene)s (TDAF), 2-(9,9′-spirobifluorene-2-yl)-9,9′-spirobifluorene (BSDF), 2,7-bis(9,9′-spirobifluorene-2-yl)-9,9′-spirobifluorene (TSDF), bis(9,9-diarylfluorene)s (BDAF), 4,4′-bis(2,2-diphenyl-ethene-1-yl)-4,4′-di-(tert-butyl)phenyl (p-TDPVBi), 1,3-bis(carbazole-9-yl)benzene (mCP), 1,3,5-tris(carbazole-9-yl)benzene (tCP), 4,4′,4″-tris(carbazole-9-yl)triphenylamine (TcTa), 4,4′-bis(carbazole-9-yl)biphenyl (CBP), 4,4′-bisBis(9-carbazolyl)-2,2′-dimethyl-biphenyl (CBDP), 4,4′-bis(carbazole-9-yl)-9,9-dimethyl-fluorene (DMFL-CBP), 4,4′-bis(carbazole-9-yl)-9,9-bisbis(9-phenyl-9H-carbazole)fluorene (FL-4CBP), 4,4′-bis(carbazole-9-yl)-9,9-di-tolyl-fluorene (DPFL-CBP), or 9,9-bis(9-phenyl-9H-carbazole)fluorene (FL-2CBP).
- The dopant material of the organic emissive layer may be, for example, 4,4′-bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi), 9,10-di(naph-2-tyl)anthracene (ADN), or 3-tert-butyl-9,10-di(naph-2-tyl)anthracene (TBADN).
- The
first electrode 221 may function as an anode, and thesecond electrode 222 may function as a cathode, but the polarities of the first andsecond electrodes - When the
first electrode 221 functions as an anode, thefirst electrode 221 may include a material having a high work function, such as ITO, IZO, ZnO, or In2O3. Also, according to purpose or design, thefirst electrode 221 may further include a reflection layer formed of, for example, Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Yb, or Ca. - When the
second electrode 222 functions as a cathode electrode, thesecond electrode 222 may be formed of a metal, such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, or Ca. When the organic light-emittingdisplay apparatus 2 is a top emissive type display apparatus in which an image is formed away from thesubstrate 1, light needs to be transmitted through thesecond electrode 222. To this end, thesecond electrode 222 may include a transparent metal oxide, such as ITO, IZO, ZnO, or In2O3. Alternatively, thesecond electrode 222 may be formed as a thin film by using Al, Ag, and/or Mg. For example, thesecond electrode 222 may be formed in a single-layer structure or a stack structure including Mg:Ag and/or Ag. Unlike thefirst electrode 221, thesecond electrode 222 is formed such that a common voltage is applied to each of all pixels thereof, and to this end, thesecond electrode 222 is formed as a common electrode to all pixels and is not formed of a plurality of patterns to correspond to pixels. Alternatively, thesecond electrode 222, which is the common electrode, may also be patterned into a mesh form, from which portions except those corresponding to a light emission area are removed. - When the
second electrode 222 is formed as a common electrode, surface resistance of thesecond electrode 222 is increased, thereby causing voltage drop (IR drop). According to the current embodiment of the present invention, to solve this issue, athird electrode 223 that is electrically connected to thesecond electrode 222 may be further included. - In addition, an upper surface of the
second electrode 222 may be damaged by theencapsulation substrate 23 ofFIG. 1 . Moreover, when forming theencapsulation layer 26 as illustrated inFIG. 2 , thesecond electrode 222 is likely to be damaged when forming theencapsulation layer 26. Also, thesecond electrode 222 is likely to be damaged by external air or impurities. According to the current embodiment of the present invention, acapping layer 230 may be formed on thesecond electrode 222. - The
capping layer 230 includes afirst capping layer 231 and asecond capping layer 232. Thefirst capping layer 231 may be formed to correspond to the light emission area PA, and thesecond capping layer 232 may be formed to correspond to the transmission area TA. Also, thefirst capping layer 231 and thesecond capping layer 232 may be formed separately. In more detail, the thicknesses of thefirst capping layer 231 and thesecond capping layer 232 may be different, and in particular, a thickness of thesecond capping layer 232 may be less than that of thefirst capping layer 231. - The
capping layer 230 is formed on thesecond electrode 222 in a first area R1 and has afirst edge 230 a. - The
third electrode 223 is formed on thesecond electrode 222 in a second area R2 and has asecond edge 223 a. Thethird electrode 223 is adjacent and horizontal to thecapping layer 230. - The first area R1 corresponds to the light emission area PA and the transmission area TA in at least one pixel, and an edge of the first area R1 is the
first edge 230 a of thecapping layer 230. The second area R2 corresponds to a portion of thesecond electrode 222 other than (or except) the first area R1, thethird electrode 223 is formed over the entire second area R2, and an edge of the second area R2 is thesecond edge 223 a of thethird electrode 223. The second area R2 is an area except at least the light emission area PA. - A lateral surface of the
first edge 230 a of thecapping layer 230 and a lateral surface of thesecond edge 223 a of thethird electrode 223 contact each other. - The
third electrode 223 may preferably be thicker than thesecond electrode 222 to reduce surface resistance of thesecond electrode 222. - The
capping layer 230 may preferably be light-transmissive. In particular, in the transmission area TA, desirably, visible rays transmit through thesecond capping layer 232 as much as possible without losing optical characteristics, and thus, transmittance of thesecond capping layer 232 may preferably be high. - Also, in the light emission area PA, desirably, visible rays generated by the
intermediate layer 220 should transmit through thefirst capping layer 231 without losing optical characteristics. That is, thefirst capping layer 231 may preferably be formed such that visible rays generated by theintermediate layer 220 transmit through thefirst capping layer 231 and image quality, such as luminance, contrast, color conversion, or the like, are considered at the same time. - For example, the
second capping layer 232 may be thinner than thefirst capping layer 231 to improve transparency of the transmission area TA and image quality of the light emission area PA. - The
capping layer 230 may be formed as a thin layer that is thinner than thethird electrode 223, but is not limited thereto. - According to an embodiment of the present invention, an adhesive force between the
third electrode 223 and thecapping layer 230 is set to be weaker than an adhesive force between thethird electrode 223 and thesecond electrode 222. - To this end, the
capping layer 230 may be formed of a material including 8-quinolinolato lithium (Liq), N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, N(diphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, or 2-(4-(9,10-di(naphthalene-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole. - The
first capping layer 231 and thesecond capping layer 232 may be formed using the same material for simplicity of manufacture, but the embodiment of the present invention is not limited thereto, and thefirst capping layer 231 and thesecond capping layer 232 may also include different materials. - Also, the
third electrode 223 may be formed of magnesium (Mg). - Magnesium (Mg) of the
third electrode 223 is a metal, and thus, has a good adhesive property with respect to thesecond electrode 222. However, Mg is not easily adhered to the material of thecapping layer 230. Thus, thethird electrode 223 may be easily patterned by using the adhesive force between thethird electrode 223 and thecapping layer 230. - As described above, the
third electrode 223 is patterned so that thethird electrode 223 is formed only in the second area R2. However, after forming theintermediate layer 220 of the organic light-emitting device EL, thethird electrode 223 may not be patterned using a wet process such as a photolithography method which is frequently used as a patterning method of a typical metal layer, because when water and/oxygen penetrates into theintermediate layer 220 in the wet process, the lifespan (lifetime) of the organic light-emitting device EL is abruptly decreased. - Thus, it is difficult to pattern the
third electrode 223 in actuality. - According to the current embodiment of the present invention, the
third electrode 223 may be simply patterned using an adhesive force between thethird electrode 223 and thecapping layer 230. Hereinafter, a method of manufacturing thecapping layer 230, according to an embodiment of the present invention, will be described in more detail. - First, the manufacturing method is the same until forming the
second electrode 222, and then a mask is used to form thecapping layer 230. Thecapping layer 230 may be formed of an organic material described above, and thus, may be formed using a thermal evaporation method using a mask. An opening is formed in the mask to correspond to a pattern of thecapping layer 230. - Here, the
first capping layer 231 and thesecond capping layer 232 are formed separately. That is, thefirst capping layer 231 is formed using a mask having an opening corresponding to thefirst capping layer 231, and then thesecond capping layer 232 is formed using a mask having an opening corresponding to thesecond capping layer 232. Referring toFIG. 5 , thefirst capping layer 231 and thesecond capping layer 232 have different sizes, and in this case, thefirst capping layer 231 and thesecond capping layer 232 may be formed using different masks. - However, the embodiment of the present invention is not limited thereto, and when the
first capping layer 231 and thesecond capping layer 232 are to be formed similarly, thefirst capping layer 231 may be formed first using a mask, and then the mask may be used to form thesecond capping layer 232. - Alternatively, the
first capping layer 231 may be formed after forming thesecond capping layer 232. - Then, an open mask having an overall opening corresponding to all pixels is used to form the
third electrode 223 using a material for forming thethird electrode 223. In this case, the material for forming thethird electrode 223 has poor adhesive force with respect to thecapping layer 230, and thus, is not formed on thecapping layer 230, and is formed only on thesecond electrode 222, which has a relatively good adhesive force. - Accordingly, the
third electrode 223 may be spontaneously (naturally) patterned at a desired position without an additional patterning operation such as a photolithography method. -
FIG. 5 is a detailed plan view of thecapping layer 230 of the organic light-emittingunit 21 ofFIG. 1 , according to an embodiment of the present invention. As illustrated inFIG. 5 , thecapping layer 230 may be formed to be in an island form in each pixel P. Thefirst capping layer 231 and thesecond capping layer 232 are formed separately, and thus, may be spaced apart from each other. However, the embodiment of the present invention is not limited thereto, and thefirst capping layer 231 and thesecond capping layer 232 may be formed adjacent to each other or may overlap by a portion, particularly, edge portions thereof. - The
third electrode 223 is arranged as a lattice pattern between pixels P. -
FIG. 6 is a plan view of acapping layer 230 of the organic light-emittingunit 21 according to another embodiment of the present invention. InFIG. 6 , as an example of thecapping layer 230 of the organic light-emittingunit 21 ofFIG. 1 , thesecond capping layer 232 of thecapping layer 230 may includesub-capping layers capping layer 230, thefirst capping layer 231, thesub-capping layer 232A, and thesub-capping layer 232B may be sequentially formed. - That is, the
capping layer 230 may be formed by three operations. Thecapping layer 230 may also be formed using a single mask. - Also, the
sub-capping layers second capping layer 232 include the above-described materials for forming thecapping layer 230 and may be formed of the same material. However, the embodiment of the present invention is not limited thereto, and thesub-capping layers second capping layer 232 may also be formed using different materials. - Also, according to another embodiment of the present invention, the
capping layer 230 of the organic light-emittingunit 21 ofFIG. 1 may be formed to be in an island form in a plurality of pixels P as illustrated inFIG. 7 . In this case, thethird electrode 223 is arranged as a lattice pattern that passes by spaces between the plurality of pixels P. Although not illustrated inFIG. 7 , thesecond capping layer 232 of thecapping layer 230 may also include a plurality of sub-capping layers, as illustrated inFIG. 6 . - Although not illustrated in the drawings, when forming the
third electrode 223, a material for forming thethird electrode 223 may be formed not only in an area except thecapping layer 230, but also as a thin layer that is thinner than thethird electrode 223 formed in the area except thecapping layer 230, since the material for forming thethird electrode 223 has poor adhesive force with respect to thecapping layer 230. That is, the material should theoretically not form as a layer on thecapping layer 230. In addition, even if the material is formed as a layer only on thesecond electrode 222 having a relatively good adhesive force, the material for forming thethird electrode 223 is deposited without using an additional patterning mask but using an open mask. Consequently, a very thin layer may be formed on thecapping layer 230 in a physically unstable state. - However, since the material for forming the
third electrode 223, which may be formed on thecapping layer 230, is very thin, the material does not have a great influence on the luminance of the organic light-emitting device EL. - According to the current embodiment of the present invention, as the light emission area PA and the transmission area TA are separate, when observing the outside through the transmission area TA, distortion of external images generated due to diffusion of external light related to patterns of devices in the pixel circuit portion PC may be reduced or prevented.
- The light emission area PA and the transmission area TA are formed such that a ratio of a surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is in a range from about 5% to about 90%.
- In one embodiment, if the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is less than 5%, the amount of light that is transmitted through the transmission area TA may be small, and thus, a viewer may have difficulty viewing an object or an image on the opposite side of the organic light-emitting
display apparatus 2. That is, the organic light-emittingunit 21 may not be regarded as transparent. However, even if the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is about 5%, if an intensity of external light is high, a user may sufficiently recognize an object or an image disposed on the opposite side, through the organic light-emittingdisplay apparatus 2, and thus, the user may regard the organic light-emittingunit 21 as a transparent display unit. In addition, when the thin film transistor of the pixel circuit portion PC is formed as a transparent thin film transistor, such as an oxide semiconductor, and an organic light-emitting device is also formed of a transparent device, the effect of the organic light-emittingdisplay apparatus 2 as a transparent display apparatus may be enhanced. - In another embodiment, if the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA is greater than 90%, pixel integration of the organic light-emitting
unit 21 is too low and images may not be stably formed through light emission of the light emission area PA. That is, the smaller the surface area of the light emission area PA, the higher the need of luminance of light emitted from theintermediate layer 220. Thus, if an organic light-emitting device is operated in a high luminance mode, the lifespan (lifetime) of the organic light-emittingdisplay apparatus 2 is abruptly decreased. - Thus, the ratio of the surface area of the transmission area TA with respect to the total surface area of the light emission area PA and the transmission area TA may preferably be in a range from 20% to 70%.
- In one embodiment, if the ratio is less than 20%, the surface area of the light emission area PA is exceedingly greater than that of the transmission area TA, and a user has difficulty viewing images outside through the transmission area TA. In another embodiment, if the ratio exceeds 70%, designing the pixel circuit portion PC, which is to be arranged in the light emission area PA, may be restricted too much.
- The
first electrode 221 that is electrically connected to the pixel circuit portion PC is included in the light emission area PA, and the pixel circuit portion PC overlaps with thefirst electrode 221 so as to be covered by thefirst electrode 221. In addition, at least one of the conductive lines, including the scan line S, the data line D, and the Vdd line V, described above may be arranged to cross thefirst electrode 221. However, since a ratio at which these conductive lines hinder transmittance is less than that of the pixel circuit portion PC, all of the conductive lines may be disposed adjacent to thefirst electrode 221 according to design conditions. - As described above, if the
first electrode 221 includes a reflection layer formed of a conductive metal on which light may be reflected, thefirst electrode 221 covers the pixel circuit portion PC and reduces or prevents distortion of external images in the light emission area PA due to the pixel circuit portion PC. - Also, according to the current embodiment of the present invention, as illustrated in
FIGS. 3 and 4 , the light emission area PA and the transmission area TA are arranged in the first area R1. Thecapping layer 230 is disposed within the first area R1, and thus, covers both the light emission area PA and the transmission area TA. In addition, thethird electrode 223 is formed in the second area R2 outside the first area R1. - In addition, a transmission window may be formed by removing a portion of the
second electrode 222 from the transmission area TA, thereby further increasing light transmittance of the transmission area TA. Here, the transmission window is not limited to being formed by removing a portion of thesecond electrode 222 and may also be formed on at least one of the pixel-defininglayer 219, thepassivation layer 218, theinterlayer insulating layer 215, thegate insulating layer 213, and thebuffer layer 211. -
FIG. 8 is a plan view illustrating an organic light-emitting unit according to another embodiment of the present invention. - Referring to
FIG. 8 , each pixel is formed of red, green, and blue sub-pixels so as to emit white light. However, white light may also be generated by using colors other than red, green, and blue colors. - In this case, one transmission area TA for each of
first electrodes first electrodes first electrodes first electrode 221 c. - In this structure, one large transmission area TA is included for a plurality of sub-pixels, and thus, transmittance of the entire display apparatus may be further increased and distortion of images due to light diffusion may also be further reduced.
- Here, one large transmission window may also be formed by removing at least a portion of a second electrode from the transmission area TA, as described above. The transmission window is not limited to the removed portion of the second electrode but may also be formed on at least one of a pixel-defining layer, a passivation layer, an interlayer insulating layer, a gate insulating layer, and a buffer layer.
- A capping layer and a third electrode are also formed in the embodiment of
FIG. 8 described above. That is, a capping layer is formed to correspond to a transmission area and a light emission area, and the third electrode is formed around the capping layer. Also, a first capping layer is formed in the light emission area, and a second capping layer is formed in the transmission area. The light emission area ofFIG. 8 may be regarded as corresponding to areas of thefirst electrodes -
FIG. 9 is a graph showing light transmittance according to thickness of a capping layer. Referring toFIG. 9 , an area A has a large transmittance, and an area B has a lower light transmittance than the area A. - As described above, the
first capping layer 231 and thesecond capping layer 232 of thecapping layer 230 are separately formed. - Visible rays transmit through the transmission area TA, and transmittance of the
second capping layer 232 may preferably be high. However, thesecond electrode 222 below thesecond capping layer 232 may preferably be formed such that a thickness of thesecond capping layer 232 is sufficient to protect thesecond electrode 222. In more detail, thesecond capping layer 232 may have a thickness corresponding to the area A, that is, a range from about 30 Å to about 60 Å. - In the light emission area PA, an image is formed through visible rays generated by the
intermediate layer 220, and thus, a suitable thickness of thefirst capping layer 231 is determined in consideration of luminance, contrast, and color conversion of visible rays. In more detail, thefirst capping layer 231 may have a thickness corresponding to the area B, that is, a range from about 70 Å to about 90 Å. - As a result, the
first capping layer 231 is thicker than thesecond capping layer 232. - However, this is an example, and alternatively, the
first capping layer 231 and thesecond capping layer 232 may be each formed to have suitable thicknesses. In more detail, considering optical characteristics, the organic light-emittingdisplay apparatus 2 may suitably vary according to the material of theintermediate layer 220, and a suitable thickness of thefirst capping layer 231 may vary accordingly. Also, different materials may be determined to form thefirst capping layer 231 and thesecond capping layer 232, and a range of suitable thicknesses thereof may also vary. - As described above, a voltage drop of the
second electrode 222 is reduced or prevented by using thethird electrode 223 to improve electrical characteristics of the organic light-emittingdisplay apparatus 2, thereby improving image quality of the organic light-emittingdisplay apparatus 2. - Also, the
second electrode 222 is protected by using thecapping layer 230 to, e.g., completely prevent deterioration of electrical characteristics and image quality of the organic light-emittingdisplay apparatus 2 due to damage of thesecond electrode 222. - In particular, the
third electrode 223 is easily patterned using thecapping layer 230 to increase manufacturing simplicity and prevent damage of the organic light-emitting device EL when forming thethird electrode 223. - Also, the
capping layer 230 includes thefirst capping layer 231 and thesecond capping layer 232, and thefirst capping layer 231 is formed to correspond to the light emission area PA, and thesecond capping layer 232 is formed to correspond to the transmission area TA. Accordingly, as many visible rays as possible transmit through the transmission area TA, and suitable images are formed in the light emission area PA. The organic light-emittingdisplay apparatus 2 suitable for use as a transparent display apparatus having excellent image quality and transmittance may be easily manufactured. - According to the organic light-emitting display apparatus and the method of manufacturing the same, electrical characteristics and image quality of the organic light-emitting display apparatus may be easily improved.
- While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (20)
1. An organic light-emitting display apparatus comprising:
a substrate;
a plurality of pixels on the substrate and each have a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted;
a pixel circuit portion in each light emission area of the plurality of pixels;
a first electrode in each light emission area and is electrically connected to the pixel circuit portion;
an intermediate layer on the first electrode and comprises an organic emissive layer;
a second electrode on the intermediate layer; and
a capping layer on the second electrode and comprises a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area.
2. The organic light-emitting display apparatus of claim 1 , wherein the capping layer is light-transmissive.
3. The organic light-emitting display apparatus of claim 1 , wherein the first capping layer and the second capping layer have different thicknesses.
4. The organic light-emitting display apparatus of claim 1 , wherein the second capping layer is thinner than the first capping layer.
5. The organic light-emitting display apparatus of claim 1 , wherein the second capping layer comprises a plurality of sub-capping layers.
6. The organic light-emitting display apparatus of claim 1 , wherein the first capping layer and the second capping layer are separated from each other in at least a first direction and a second direction perpendicular to the first direction.
7. The organic light-emitting display apparatus of claim 1 , wherein the first capping layer and the second capping layer comprise the same material.
8. The organic light-emitting display apparatus of claim 1 , wherein the first capping layer and the second capping layer comprise different materials.
9. The organic light-emitting display apparatus of claim 1 , wherein the capping layer comprises 8-quinolinolato lithium (Liq), N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, N(diphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, or 2-(4-(9,10-di(naphthalene-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole.
10. The organic light-emitting display apparatus of claim 1 , wherein the second electrode is light-transmissive.
11. The organic light-emitting display apparatus of claim 1 , wherein:
the capping layer is on the second electrode in a first area and has a first edge, and
the organic light-emitting display apparatus further comprises a third electrode on the second electrode in a second area other than the first area, the third electrode having a second edge, and
a lateral surface of the first edge of the capping layer and a lateral surface of the second edge of the third electrode contact each other.
12. The organic light-emitting display apparatus of claim 11 , wherein the third electrode is thicker than the second electrode.
13. The organic light-emitting display apparatus of claim 11 , wherein an adhesive force between the third electrode and the capping layer is weaker than an adhesive force between the third electrode and the second electrode.
14. The organic light-emitting display apparatus of claim 11 , wherein the third electrode comprises magnesium (Mg).
15. The organic light-emitting display apparatus of claim 11 , wherein all edges of the capping layer and an edge of the third electrode contact each other.
16. A method of manufacturing an organic light-emitting display apparatus comprising a plurality of pixels each comprising a light emission area from which visible rays are emitted and a transmission area through which external light is transmitted, the method comprising:
forming a plurality of pixel circuit portions on a substrate to respectively correspond to the plurality of pixels;
forming a first electrode in a light emission area of each of the plurality of pixels and electrically connected to a corresponding one of the pixel circuit portions;
forming an intermediate layer, comprising an organic emissive layer, on the first electrode;
forming a second electrode on the intermediate layer; and
forming a capping layer on the second electrode, wherein the capping layer comprises a first capping layer corresponding to the light emission area and a second capping layer corresponding to the transmission area.
17. The method of claim 16 , wherein:
the first capping layer and the second capping layer are formed separately.
18. The method of claim 16 , wherein the first capping layer and the second capping layer are formed using a mask.
19. The method of claim 16 , wherein:
the capping layer is formed in a first area on the second electrode and has a first edge,
the method further comprises forming a third electrode in a second area other than the first area on the second electrode and has a second edge, and
a lateral surface of the first edge of the capping layer and a lateral surface of the second edge of the third electrode are formed to contact each other.
20. The method of claim 19 , wherein the forming of the third electrode comprises patterning the third electrode by using a pattern of the capping layer.
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US17/068,773 US11394015B2 (en) | 2011-12-23 | 2020-10-12 | Organic light-emitting display apparatus and method of manufacturing the same |
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US10199611B2 (en) | 2019-02-05 |
US20190173058A1 (en) | 2019-06-06 |
US20210028411A1 (en) | 2021-01-28 |
US11394015B2 (en) | 2022-07-19 |
KR101829890B1 (en) | 2018-02-20 |
US20170084881A1 (en) | 2017-03-23 |
TWI645559B (en) | 2018-12-21 |
US10840481B2 (en) | 2020-11-17 |
CN103178079B (en) | 2017-06-16 |
KR20130073721A (en) | 2013-07-03 |
TW201327798A (en) | 2013-07-01 |
CN103178079A (en) | 2013-06-26 |
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