Organic light emitting diode display

Abstract

An organic light emitting diode (OLED) display is disclosed. In one embodiment, the OLED display includes an organic light emitting element formed over a substrate and an encapsulation portion covering the organic light emitting element. Further, the encapsulation portion may include at least one organic layer and at least one inorganic layer, wherein ends of the inorganic layer and t he organic layer directly contact the substrate, and wherein the organic layer is thicker than the inorganic layer.

1 . An organic light emitting diode (OLED) display comprising:
 an organic light emitting element formed over a substrate; and   an encapsulation portion covering the organic light emitting element, wherein the encapsulation portion comprises at least one organic layer and at least one inorganic layer, wherein each end of the inorganic layer and the organic layer directly contacts the substrate, and wherein the organic layer is thicker than the inorganic layer.   
     
     
         2 . The OLED display of  claim 1 , wherein the encapsulation portion comprises a plurality of organic layers and a plurality of inorganic layers which are alternately formed with respect to the organic layers. 
     
     
         3 . The OLED display of  claim 2 , wherein the encapsulation portion comprises a first layer formed nearest the organic light emitting element and an n-th layer formed farthest from the organic light emitting element, and wherein the first layer and n-th layer are formed of an inorganic material. 
     
     
         4 . The OLED display of  claim 1 , wherein one inorganic layer and one organic layer, contacting each other, form a sub-encapsulation portion in a pair, wherein the encapsulation portion comprises n sub-encapsulation portions, and wherein the n-th sub-encapsulation portion is farther from the organic light emitting element than the (n−1)-th sub-encapsulation portion. 
     
     
         5 . The OLED display of  claim 4 , wherein the area of the inorganic layer of the n-th sub-encapsulation portion is larger than the area of the inorganic layer of the (n−1)-th sub-encapsulation portion. 
     
     
         6 . The OLED display of  claim 4 , wherein the area of the organic layer of the n-th sub-encapsulation portion is larger than the area of the organic layer of the (n−1)-th sub-encapsulation portion. 
     
     
         7 . The OLED display of  claim 1 , further comprising:
 a photo-functional layer interposed between the organic light emitting element and the encapsulation portion.   
     
     
         8 . The OLED display of  claim 7 , wherein the photo-functional layer is an ultraviolet (UV) radiation blocking layer. 
     
     
         9 . The OLED display of  claim 8 , wherein the thickness of the photo-functional layer is in the range of about 20 nm to about 200 nm. 
     
     
         10 . The OLED display of  claim 9 , wherein the thickness of the photo-functional layer is in the range of about 40 nm to about 150 nm. 
     
     
         11 . The OLED display of  claim 8 , wherein the photo-functional layer is formed of at least one of the following: tris-8-hydroxyquinoline aluminum (Alq3), benzophenone, photoacryl, BaF 2 , CsF, Na 5 Al 3 F 14 , KCl, and SiO 2 . 
     
     
         12 . The OLED display of  claim 7 , wherein the photo-functional layer is a reflective layer which comprises a first layer and a second layer having different refractive indexes. 
     
     
         13 . The OLED display of  claim 12 , wherein the organic layer is formed of an ultraviolet (UV) hardening material, and wherein the optical thickness of the first layer and t he second layer is about λ/4 of the wavelength of the ultraviolet (UV) radiation used to harden the organic layer. 
     
     
         14 . The OLED display of  claim 12 , wherein the first layer is formed of at least one of the following: tris-8-hydroxyquinoline aluminum (Alq3), benzophenone, photoacryl, BaF 2 , CsF, Na 5 Al 3 F 14 , KCl, and SiO 2 , and wherein the second layer is formed of at least one of the following: silicon nitride (SiN), Cu 2 O, Fe 2 O 3 , TiO 2 , and ZnSe. 
     
     
         15 . The OLED display of  claim 1 , wherein the organic layer is at least five times thicker than the inorganic layer. 
     
     
         16 . An organic light emitting diode (OLED) display comprising:
 an organic light emitting element formed over a substrate; and   an encapsulation layer covering the organic light emitting element, wherein the encapsulation layer comprises a plurality of organic layers and a plurality of inorganic layers which are alternately formed with respect to the organic layers, wherein each of the organic layers has two opposing ends, wherein each of the inorganic layers has two opposing ends, wherein the ends of the organic layers and inorganic layers are non-linear and contact the substrate, and wherein one of the inorganic layers is formed nearest and directly contacts the organic light emitting element.   
     
     
         17 . The OLED display of  claim 16 , wherein the encapsulation layer comprises an inorganic layer which is farthest from the organic light emitting element. 
     
     
         18 . The OLED display of  claim 17 , further comprising a photo-functional layer interposed between the organic light emitting element and the encapsulation layer, wherein the photo-functional layer contacts the substrate and the ends of the organic layers and inorganic layers. 
     
     
         19 . The OLED display of  claim 18 , wherein the thickness of the photo-functional layer is in the range of about 20 nm to about 200 nm. 
     
     
         20 . The OLED display of  claim 18 , wherein the photo-functional layer has a non-linear portion which is formed adjacent to the ends of the organic layers and inorganic layers.