Organic electroluminescent display panel and its manufacturing method

Abstract

A new organic EL display panel comprises transparent electrodes 2, an insulating layer 7, an organic luminous layer 4 and backside electrodes 5 successively laid on a transparent substrate 1. The insulating layer 7 is converted from a positive novolac, negative cyclized rubber or chemical amplified photoresist layer shaped to a grate pattern, by baking treatment to remove water and a solvent from the photoresist layer. Electric resistance of the insulating layer 7 is good enough to inhibit leakage of an electric current between the electrodes 2 and 5. The EL display panel reproduces a distinct image over a long term without growth of dark spots.

1 . An organic electroluminescent display panel comprising: 
 transparent electrodes with a striped pattern laid on a transparent substrate,    an insulating layer with a grate pattern, which converted from a photoresist by baking treatment, laid on said transparent electrode, optionally with a cathode separator formed thereon,    an organic luminous layer deposited on said transparent electrodes through apertures of said insulating layer, and    backside electrodes, which has a striped pattern extending along a direction crossing said transparent electrodes, laid on said organic luminous layer,    
     
     
         2 . The organic electroluminescent display panel according to  claim 1 , wherein the photoresist is a positive novolac, negative cyclized rubber or chemical amplified photoresist.  
     
     
         3 . The organic electroluminescent display panel according to  claim 1 , wherein the photoresist contains black pigment or dye.  
     
     
         4 . A method of manufacturing an organic electroluminescent display panel, comprising the steps of: 
 providing a transparent substrate on which transparent electrodes are formed in a striped pattern,    applying a positive novolac, negative cyclized rubber or chemical amplified photoresist to said transparent substrate,    shaping the photoresist layer to a grate pattern,    converting said photoresist layer to an insulating layer free from water or a solvent by baking said photoresist layer,    optionally laying a cathode separator on said insulating layer, and    successively depositing an organic luminous layer and backside electrodes on said transparent electrodes through apertures of said insulating layer.    
     
     
         5 . The method of manufacturing an organic electroluminescent display panel according to  claim 4 , wherein the organic luminous layer is of monolayered or multilayered structure containing an organic luminous substance.  
     
     
         6 . The method of manufacturing an organic electroluminescent display panel according to  claim 4 , wherein the photoresist layer is pre-baked in prior to formation of the cathode separator.