Patent ID: 7094624
Filing Date: 2006-08-22
Classification: H01L

Abstract:
1. A method of fabricating an active matrix organic electroluminescent device, comprising: forming a ground layer on a substrate; forming a buffer layer on the ground layer; forming a polycrystalline semiconductor layer on the buffer layer; forming a gate insulation layer on the buffer layer to cover the polycrystalline silicon layer; forming a gate electrode and a first capacitor electrode on the gate insulation layer, the gate electrode disposed above the polycrystalline silicon layer; doping ions into the polycrystalline semiconductor layer using the gate electrode as a mask so that the polycrystalline semiconductor layer has an active region, a drain region and a source region, wherein the active region is disposed in the middle of the polycrystalline silicon layer under the gate electrode and the drain and source regions are disposed in both sides of the active region; forming an interlayer insulator made of an organic material on the gate insulation layer to cover the gate electrode and the first capacitor electrode; forming first, second, third and fourth contact holes, wherein the first and second contact holes expose the drain and source regions, respectively, by penetrating both the interlayer insulator and the gate insulation layer, and the third and fourth contact holes expose portions of the ground layer by penetrating the interlayer insulator, the gate insulation layer and the buffer layer; forming drain and source electrodes on the interlayer insulator, the drain and source electrode contacting the drain and source regions, respectively, through the first contact hole and through the second contact hole; forming a cathode electrode on the interlayer insulator, the cathode electrode connected to the drain electrode; forming a second capacitor electrode on the interlayer insulator, the second capacitor electrode being electrically connected to the ground layer; forming a passivation layer on the interlayer insulator to cover the drain and source electrodes, the cathode electrode and the second capacitor electrode, the passivation layer having a bank that exposes the cathode electrode; forming an organic electroluminescent layer on the passivation layer and into the bank, the organic electroluminescent layer contacting the cathode electrode through the bank; and forming an anode electrode on the exposed portion of the passivation layer and on the organic electroluminescent layer.