Organic el display panel and method of manufacturing organic el display panel

Abstract

An organic EL display panel includes a substrate, pixel electrodes, a current feeding auxiliary electrode layer provided to extend in a column direction over gaps between the pixel electrodes adjacent in a row direction, light emitting layers that each contain an organic light emitting material and are disposed over the pixel electrodes, a functional layer provided ranging over the light emitting layers and over the current feeding auxiliary electrode layer, and a common electrode layer provided continuously over the functional layer. A part of the functional layer is lacking or thinned. The common electrode layer is in direct contact with the current feeding auxiliary electrode layer exposed due to the lacking of the functional layer, or is electrically connected to the current feeding auxiliary electrode layer at a lower resistance at the thinned part of the functional layer than at other parts of the functional layer.

What is claimed is: 
     
         1 . An electro luminescence display panel, comprising:
 a substrate;   a plurality of pixel electrodes over the substrate,   a plurality of light emitting layers, wherein a light emitting layer of the plurality of light emitting layers is over each of the plurality of pixel electrodes;   a current feeding auxiliary electrode layer in a state of being not in contact with the plurality of pixel electrodes;   a first insulating layer extending in a first direction, wherein a width of the first insulating layer in the first direction is larger than the width of the first insulating layer in a second direction intersecting the first direction;   a functional layer over the plurality of light emitting layers and over a part of the current feeding auxiliary electrode layer; and   a common electrode layer extending over the functional layer and the current feeding auxiliary electrode layer, wherein the common electrode layer is in direct contact with the current feeding auxiliary electrode layer.   
     
     
         2 . The electro luminescence display panel according to  claim 1 , wherein the first insulating layer is provided with a plurality of through-holes, and wherein a number of first through-holes of the plurality of through-holes arranged in the first direction is larger than a number of second through-holes of the plurality of through-holes arranged in the second direction. 
     
     
         3 . The electro luminescence display panel according to  claim 2 , wherein a ratio of a thickness of the first insulating layer to an opening width of a through-hole of the plurality of through-holes is from 0.1 to 0.8. 
     
     
         4 . The electro luminescence display panel according to  claim 2 , wherein
 the first insulating layer is over the current feeding auxiliary electrode layer,   a part of the functional layer is lacking or thinned, and   the part of the functional layer is inside a through-hole of the plurality of through-holes and located in a vicinity of an inner wall of the through-hole over the current feeding auxiliary electrode layer.   
     
     
         5 . The electro luminescence display panel according to  claim 1 , further comprising a second insulating layer that intersects the first insulating layer, wherein the width of the first insulating layer in the second direction is larger than a width of the second insulating layer in the first direction. 
     
     
         6 . The electro luminescence display panel according to  claim 1 , further comprising:
 a plurality of column banks over a plurality of first gaps each located between the plurality of pixel electrodes adjacent in the second direction and over a plurality of second gaps each located between a pixel electrode and the current feeding auxiliary electrode layer adjacent in the second direction, wherein   the plurality of column banks extends in the first direction, and   column banks of the plurality of column banks provided over the plurality of second gaps have a side wall inclined toward a side of the current feeding auxiliary electrode layer at an acute angle against a surface of the substrate.   
     
     
         7 . The electro luminescence display panel according to  claim 6 , wherein the column banks provided over the plurality of second gaps are formed from a negative type photosensitive material. 
     
     
         8 . The electro luminescence display panel according to  claim 6 , wherein an inclination angle of the side wall against the surface of the substrate is 45 to 80 degrees. 
     
     
         9 . The electro luminescence display panel according to  claim 1 , wherein
 the light emitting layer of the plurality of light emitting layers comprises an inkjet film,   the inkjet film of the light emitting layer exists in a pixel region of the electro luminescence display panel, and   the light emitting layer does not exist in a region of the current feeding auxiliary electrode layer.   
     
     
         10 . The electro luminescence display panel according to  claim 1 , wherein the plurality of pixel electrodes comprises a light reflecting material. 
     
     
         11 . The electro luminescence display panel according to  claim 1 , wherein the current feeding auxiliary electrode layer comprises a light reflecting material. 
     
     
         12 . An electro luminescence display panel, comprising:
 a substrate;   a plurality of pixel electrodes over the substrate,   a plurality of light emitting layers, wherein a light emitting layer of the plurality of light emitting layers is over each of the plurality of pixel electrodes;   a current feeding auxiliary electrode layer in a state of being not in contact with the plurality of pixel electrodes;   a first insulating layer extending in a first direction, wherein a width of the first insulating layer in the first direction is larger than the width of the first insulating layer in a second direction intersecting the first direction;   a functional layer over the plurality of light emitting layers and over the current feeding auxiliary electrode layer such that a first part of the functional layer is thinner than a second part of the functional layer in the current feeding auxiliary electrode layer; and   a common electrode layer extending over the functional layer, wherein the common electrode layer is electrically connected to the current feeding auxiliary electrode layer at a lower resistance at the first part of the functional layer.   
     
     
         13 . The electro luminescence display panel according to  claim 12 , wherein the first insulating layer is provided with a plurality of through-holes, and wherein a number of first through-holes of the plurality of through-holes arranged in the first direction is larger than a number of second through-holes of the plurality of through-holes arranged in the second direction. 
     
     
         14 . The electro luminescence display panel according to  claim 13 , wherein a ratio of a thickness of the first insulating layer to an opening width of a through-hole of the plurality of through-holes is from 0.1 to 0.8. 
     
     
         15 . The electro luminescence display panel according to  claim 12 , further comprising a second insulating layer that intersects the first insulating layer, wherein the width of the first insulating layer in the second direction is larger than a width of the second insulating layer in the first direction. 
     
     
         16 . The electro luminescence display panel according to  claim 12 , wherein
 the light emitting layer of the plurality of light emitting layers comprises an inkjet film,   the inkjet film of the light emitting layer exists in a pixel region of the electro luminescence display panel, and   the light emitting layer does not exist in a region of the current feeding auxiliary electrode layer.   
     
     
         17 . The electro luminescence display panel according to  claim 12 , wherein the current feeding auxiliary electrode layer comprises a light reflecting material. 
     
     
         18 . An electro luminescence display panel, comprising:
 a substrate;   a plurality of pixel electrodes over the substrate;   a plurality of auxiliary electrodes over the substrate;   a plurality of light emitting layers formed on the plurality of pixel electrodes;   a dielectric layer having a plurality of contact holes;   a functional layer over the plurality of light emitting layers and over the plurality of auxiliary electrodes; and   a common electrode on the functional layer, wherein
 the plurality of auxiliary electrodes and the plurality of pixel electrodes are formed as same layer, and 
 each of the plurality of auxiliary electrodes is covered and connected with both the common electrode and the functional layer in each of the plurality of contact holes.