Method for manufacturing a light emitting display

Abstract

The invention relates to a method for manufacturing a light emitting display on a substrate comprising the steps of depositing a first electrode layer on or over the substrate, forming a plurality of light emitting layer segments on or over at least a part of the first electrode layer, applying at least one protective layer on or over at least one of the light emitting layer segments and depositing a second electrode layer. By providing a protective layer over the light emitting layer segments more freedom with regard to processing conditions is obtained in depositing and/or patterning of subsequent layers, since the susceptible light emitting layer segments are protected by the protective layers.

1 . Method for manufacturing a light emitting display on a substrate comprising the steps of: 
 depositing a first electrode layer on or over said substrate;    forming a plurality of light emitting layer segments on or over at least a part of said first electrode layer;    applying at least one protective layer on or over at least one of said light emitting layer segments;    depositing a second electrode layer.    
     
     
         2 . Method according to  claim 1 , wherein said first electrode layer is deposited on or over said substrate and comprises a material transparent to the light to be emitted by said light emitting layer segments in operation of the light emitting display.  
     
     
         3 . Method according to  claim 1 , wherein said protective layer comprises molybdenum or titanium.  
     
     
         4 . Method according to  claim 1 , wherein said second electrode layer is patterned by applying photolithography and subsequent etching in correspondence to said light emitting layer segments.  
     
     
         5 . Method according to  claim 4 , wherein said second electrode layer is patterned such that it comprises recesses outside the areas comprising said light emitting layer segments, beneath which recesses said protective layer is substantially removed.  
     
     
         6 . Method according to  claim 5  wherein said patterned second electrode layer and said recesses are covered by at least one sealing film.  
     
     
         7 . Method according to  claim 1 , wherein said second electrode layer has a thickness larger than 0.5 μm and preferably between 0.5 μm and 3 μm.  
     
     
         8 . Light emitting display comprising: 
 a substrate;    a first electrode layer deposited on or over said substrate;    a plurality of light emitting layer segments formed on or over said first electrode layer;    at least one protective layer applied on or over at least some of said light emitting layer segments;    a second electrode layer.    
     
     
         9 . Light emitting display according to  claim 8 , wherein said protective layer comprises molybdenum or titanium.  
     
     
         10 . Light emitting display according to  claim 8 , wherein said second electrode layer has a thickness between 0.5 μm and 3 μm.  
     
     
         11 . Light emitting display according to  claim 8 , wherein said second electrode layer is patterned in correspondence with said light emitting layer segments and said patterned second electrode layer is covered by at least one sealing film.  
     
     
         12 . Electric device comprising a light emitting display according to one of the claims  8 - 11  and/or manufactured according one of the claim  1 - 7 .