Patent ID: 6921918
Filing Date: 2005-07-26
Classification: H01L

Abstract:
1. An active matrix organic electroluminescent device, comprising: a substrate; a ground layer on the substrate; a buffer layer on the ground layer; a polycrystalline semiconductor layer on the buffer layer, the polycrystalline semiconductor layer having an active region, a drain region and a source region, wherein the active region is in the middle of the polycrystalline silicon layer and the drain and source regions are disposed in both sides of the active region; a gate insulation layer on the buffer layer to cover the polycrystalline silicon layer; a gate electrode on the gate insulation layer, above the active region of the polycrystalline silicon layer; a first capacitor electrode on the gate insulation layer; an interlayer insulator on the gate insulation layer to cover the gate electrode and the first capacitor electrode; drain and source electrodes on the interlayer insulator, the drain and source electrode contacting the drain and source regions, respectively, through first and second contact holes that penetrate the interlayer insulator and the gate insulation layer; a cathode electrode on the interlayer insulator, the cathode electrode extended from and integrally formed as one unit with the drain electrode; a second capacitor electrode on the interlayer insulator; 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 well that exposes the cathode electrode; an organic electroluminescent layer on the passivation layer and into the well, the organic electroluminescent layer contacting the cathode electrode through the well; and an anode electrode on the exposed portion of the passivation layer and on the organic electroluminescent layer.