Organic light emitting display device and method of fabricating the same

Abstract

An organic light emitting display device (OLED) suppressing a resonance effect and having an enhanced luminance, and a method of fabricating the same, are disclosed. One embodiment of the OLED includes: a substrate; a first electrode disposed over the substrate and having a reflective layer; an organic layer disposed over the first electrode and having a white emission layer; a second electrode disposed over the organic layer; and a transmittance controlled layer (TCL) disposed over the second electrode and having an optical path length of about 260 to about 1520 Å.

1 . An organic light emitting display device (OLED), comprising:
 a substrate;   a first electrode formed over the substrate, the first electrode comprising a reflective layer, the reflective layer being substantially reflective to visible light;   an organic layer formed over the first electrode, the organic layer comprising at least one light emission layer configured to emit white light;   a second electrode formed over the organic layer; and   a transmittance controlled layer (TCL) formed on the second electrode, the transmittance controlled layer having an optical path length of about 260 Å to about 1520 Å, wherein the optical path length extends in the direction of the thickness of the transmittance controlled layer.   
     
     
         2 . The OLED of  claim 1 , wherein the reflective layer comprises at least one selected from the group consisting of aluminum, silver and an alloy thereof. 
     
     
         3 . The OLED of  claim 1 , wherein the at least one light emission layer is a single layer. 
     
     
         4 . The OLED of  claim 1 , wherein the at least one light emission layer comprises multiple layers. 
     
     
         5 . The OLED of  claim 4 , wherein the multiple layers comprise an orange-red emission layer and a blue emission layer. 
     
     
         6 . The OLED of  claim 4 , wherein the multiple layers comprise at least two of a blue emission layer, a green emission layer, and a red emission layer. 
     
     
         7 . The OLED of  claim 1 , wherein the second electrode comprises at least one of MgAg and AlAg. 
     
     
         8 . The OLED of  claim 1 , wherein the transmittance controlled layer comprises at least one selected from the group consisting of SiNx, SiO 2 , SiON, MgF 2 , ZnS, ZnSe, TeO 2 , ZrO 2 , an arylenediamine derivative, a triamine derivative, 4,4′-N,N′-dicarbazol-biphenyl (CBP), and an aluminum quinoline (Alq3) complex. 
     
     
         9 . A method of fabricating an organic light emitting display device (OLED), comprising:
 providing a substrate;   forming a first electrode including a reflective layer over the substrate;   forming an organic layer including a light emission layer over the first electrode, the light emission layer being configured to emit white light;   forming a second electrode over the organic layer; and   forming a transmittance controlled layer (TCL) having an optical path length of about 260 Å to about 1520 Å on the second electrode.   
     
     
         10 . The method of  claim 9 , wherein the organic layer is formed by one of a vacuum deposition method, an inkjet printing method, and a laser induced thermal imaging method. 
     
     
         11 . The method of  claim 9 , wherein the transmittance controlled layer is formed by a vacuum deposition method or a lithography method. 
     
     
         12 . An organic light emitting display device (OLED), comprising:
 an anode electrode comprising a reflective layer configured to be at least partially reflective to visible light;   a cathode electrode opposing the anode electrode and being partially reflective to visible light;   an organic light emitting layer interposed between the anode and cathode electrodes, the organic light emitting layer being configured to emit white light; and   an optical layer contacting the cathode electrode interposed between the optical layer and the organic light emitting layer, wherein the optical layer is at least partially transparent to visible light and is configured to reduce optical resonance caused by multiple reflections of visible light between the anode and cathode electrodes, wherein the device is configured to emit the white light through the cathode electrode and the optical layer.   
     
     
         13 . The OLED of  claim 12 , wherein the optical layer has an optical path length (OPL) represented by Formula 1:
     OPL=t×n    Formula 1   wherein t is the thickness of the optical layer, and n is the refractive index of the optical layer, and wherein the OPL of the optical layer is from about 260 Å to about 1520 Å.   
     
     
         14 . The OLED of  claim 12 , wherein the cathode electrode has a transmittance of less than about 90% to visible light. 
     
     
         15 . The OLED of  claim 12 , wherein the cathode electrode comprises at least one selected from the group consisting of MgAg and AlAg. 
     
     
         16 . The OLED of  claim 12 , wherein the optical layer comprises at least one selected from the group consisting of SiNx, SiO 2 , SiON, MgF 2 , ZnS, ZnSe, TeO 2 , ZrO 2 , an arylenediamine derivative, a triamine derivative, 4,4′-N,N′-dicarbazol-biphenyl (CBP), and an aluminum quinoline (Alq3) complex. 
     
     
         17 . The OLED of  claim 12 , further comprising a color filter layer configured to filter the white light emitting from the organic light emitting layer. 
     
     
         18 . The OLED of  claim 17 , wherein the white light has at least two emission peaks in the electroluminescence spectrum thereof, and wherein the emission peaks have substantially more uniform peak heights than those of white light emitting from the organic light emitting layer in the absence of the optical layer. 
     
     
         19 . The OLED of  claim 12 , wherein the organic light emitting layer comprises at least two organic light emitting materials configured to emit lights of different colors. 
     
     
         20 . The OLED of  claim 12 , wherein the organic light emitting layer comprises at least two sublayers stacked over each other, each of the sublayers being configured to emit light of a different color.