Stacked OLED display having improved efficiency

Abstract

An OLED device having a pixel, including a plurality of light transmissive filters; a first electrode layer defining a corresponding plurality of separately addressable electrodes; a first layer of white light emitting OLED material; a doped organic conductor layer; a second layer of white light emitting OLED material; and a second electrode layer defining a single electrode coextensive with the plurality of color filters.

1 - 19 . (canceled)  
   
   
       20 . An OLED device, comprising: 
 a first electrode layer;    a first layer of white light emitting OLED material disposed over the first electrode layer;    a doped organic conductor layer;    a second layer of white light emitting OLED material electrically connected in series with the first layer of white light emitting OLED material through the doped organic conductor layer; and    a second electrode layer; whereby in operation current is passed through the first and second layers of white light emitting OLED materials and through the doped organic conductor layer via the first and second electrode layers.    
   
   
       21 . The OLED device claimed in  claim 20 , wherein the device is a top emitting OLED device.  
   
   
       22 . The OLED device claimed in  claim 20 , wherein the device is a bottom emitting OLED device.  
   
   
       23 . The OLED device claimed in  claim 20 , wherein the first and second layers of white light emitting OLED material are the same material.  
   
   
       24 . The OLED device claimed in  claim 20 , wherein the first and second layers of white light emitting OLED material are different materials.