Organic light emitting display devices and methods of manufacturing organic light emitting display devices

Abstract

An organic light emitting display device is disclosed. The organic light emitting display device includes a substrate, a first electrode, a pixel defining layer, a first hydrophobic pattern, at least one charge transport layer, a second hydrophobic pattern, an organic light emitting layer and a second electrode. The substrate has a pixel region and a non pixel region surrounding the pixel region. The first electrode, the at least one charge transport layer and the organic light emitting layer are disposed on the substrate in the pixel region, while the pixel defining layer, the first hydrophobic pattern and the second hydrophobic pattern are disposed on the substrate in the non pixel region. The charge transport layer of one pixel is separated from a charge transport layer of another pixel by the first and second hydrophobic patterns to prevent crosstalk phenomenon.

What is claimed: 
     
         1 . An organic light emitting display device, comprising:
 a substrate having a pixel region and a non pixel region surrounding the pixel region;   a first electrode disposed on the substrate in the pixel region;   a pixel defining layer disposed on the substrate in the non pixel region;   a first hydrophobic pattern disposed on the pixel defining layer;   at least one charge transport layer disposed on the first electrode;   a second hydrophobic pattern disposed on the pixel defining layer to cover the first hydrophobic pattern;   an organic light emitting layer disposed on the at least one charge transport layer; and   a second electrode disposed on the organic light emitting layer.   
     
     
         2 . The organic light emitting display device of  claim 1 , wherein each of the first hydrophobic pattern and the second hydrophobic pattern has a surface energy below about 20 dyne/cm 2 . 
     
     
         3 . The organic light emitting display device of  claim 1 , wherein the first hydrophobic pattern has an electric conductivity smaller than an electric conductivity of the at least one charge transport layer. 
     
     
         4 . The organic light emitting display device of  claim 1 , wherein the pixel defining layer has a thickness of about 100 nm to about 400 nm. 
     
     
         5 . The organic light emitting display device of  claim 1 , wherein the at least one charge transport layer includes a hole transfer layer and a hole injection layer. 
     
     
         6 . The organic light emitting display device of  claim 1 , wherein the at least one charge transport layer includes an electron transfer layer and an electron injection layer. 
     
     
         7 . The organic light emitting display device of  claim 1 , wherein a portion of the charge transport layer overlaps the pixel defining layer, and wherein the second hydrophobic pattern covers the portion of the charge transport layer. 
     
     
         8 . The organic light emitting display device of  claim 1 , wherein the first hydrophobic pattern and the second hydrophobic pattern do not overlap with the first electrode. 
     
     
         9 . The organic light emitting display device of  claim 1 , wherein the first hydrophobic pattern has a thickness smaller than a thickness of the pixel defining layer, and the second hydrophobic pattern has a thickness larger than the thickness of the pixel defining layer. 
     
     
         10 . The organic light emitting display device of  claim 9 , wherein the first hydrophobic pattern and the second hydrophobic pattern extend in a first direction and a second direction substantially perpendicular to the first direction. 
     
     
         11 . The organic light emitting display device of  claim 9 , wherein the first hydrophobic pattern extends in a first direction and a second direction substantially perpendicular to the first direction, and the second hydrophobic pattern extends in the second direction. 
     
     
         12 . A method of manufacturing an organic light emitting display device, comprising:
 forming a first electrode on a substrate;   forming a pixel defining layer on the substrate adjacent to the first electrode;   forming a first hydrophobic pattern on the pixel defining layer;   forming at least one charge transport layer on the first electrode;   forming a second hydrophobic pattern on the pixel defining layer to cover the first hydrophobic pattern;   forming an organic light emitting layer on the at least one charge transport layer; and   forming a second electrode on the organic light emitting layer and the second hydrophobic pattern.   
     
     
         13 . The method of  claim 12 , wherein forming the first hydrophobic pattern is performed by a process selected from the group consisting of an offset printing process, a gravure offset printing process, a gravure reverse offset printing process, an inkjet printing process, a nozzle printing process, a T-jet process, a stamping process, an electro spray process and a laser induced thermal imaging process, and forming the second hydrophobic pattern is performed by a process selected from the group consisting of an offset printing process, a gravure offset printing process, a gravure reverse offset printing process, an inkjet printing process, a nozzle printing process, a T-jet process, a stamping process, an electro spray process and a laser induced thermal imaging process. 
     
     
         14 . The method of  claim 12 , wherein forming the at least one charge transport layer is performed by a process selected from the group consisting of a slit coating process, a bar coating process and a spin coating process, the at least one charge transport layer covering the first electrode completely, the at least one charge transport layer covering the pixel defining layer partially. 
     
     
         15 . The method of  claim 12 , wherein the at least one charge transport layer includes a hole transfer layer and a hole injection layer. 
     
     
         16 . The method of  claim 12 , wherein the at least one charge transport layer includes an electron transfer layer and an electron injection layer. 
     
     
         17 . The method of  claim 12 , wherein the substrate has a plurality of pixel regions and a non pixel region surrounding the plurality of pixel regions, and the plurality of pixel regions is arranged in a first direction and a second direction substantially perpendicular to the first direction, and wherein the first electrode is formed in the pixel regions, and the pixel defining layer, the first hydrophobic pattern and the second hydrophobic pattern are formed in the non pixel region. 
     
     
         18 . The method of  claim 17 , wherein a portion of the charge transport layer overlaps with the pixel defining layer, and the second hydrophobic pattern covers the portion of the charge transport layer. 
     
     
         19 . The method of  claim 17 , wherein the first hydrophobic pattern and the second hydrophobic pattern partially or completely cover the pixel defining layer. 
     
     
         20 . A method of manufacturing an organic light emitting display device, comprising:
 forming a first electrode on a substrate;   forming a pixel defining layer on the substrate adjacent to the first electrode;   forming a first hydrophobic pattern on the pixel defining layer;   forming at least one charge transport layer on the first electrode;   forming an organic light emitting layer on the at least one charge transport layer; and   forming a second electrode on the organic light emitting layer and the second hydrophobic pattern, wherein the first hydrophobic pattern has an electric conductivity lower than an electric conductivity of the at least one charge transport layer.