Patent ID: 6844215

Claim:
A method of forming drain-to-anode connectors in a back plane for an active matrix OLED device, comprising: a) providing a substrate having at least one dielectric layer over a substrate surface; b) providing a two-dimensional array of repeating units of thin film elements over the at least one dielectric layer, each of the repeating units including a current control transistor having a drain electrode; c) providing a first organic layer over the two-dimensional array and a photoresist layer over the first organic layer; d) exposing the photoresist layer to a pattern of activating radiation, the pattern corresponding to a location of the drain electrode of each of the current control transistors; e) developing the exposed pattern in the photoresist layer and forming a corresponding pattern of undercut regions in the first organic layer; f) forming drain-to-anode connectors by depositing conductive material in a line-of-sight pattern so that the conductive material contacts each drain electrode and extends laterally beyond each drain electrode to provide tapered side walls in the undercut regions; g) removing the patterned first organic layer and the patterned photoresist layer; and h) forming an anode layer over each drain-to-anode connector and in electrical contact with such connector.