Patent ID: 7816174

Claim:
A method for manufacturing a control element of an organic electro-luminescent display, comprising: providing an insulating substrate; forming a first gate electrode, a bottom electrode of a capacitor and a second gate electrode on the insulating substrate; forming a first gate dielectric and a first channel over at least part of the first gate electrode; forming a second gate dielectric and a second channel over at least part of the second gate electrode; forming an etching stop layer, over the insulating substrate; patterning the etching stop layer to expose parts of the upper surface of the first channel and the second channel for forming source/drain contacts on each of the first channel and the second channel and expose part of the upper surface of the second gate electrode; forming a doped semiconductor layer and a conductor layer, over the insulating substrate in order; and patterning the conductor layer and the doped semiconductor layer for forming a first source/drain electrode and a second source/drain electrode on the first channel, a third source/drain electrode and a fourth source/drain electrode on the second channel, a conducting wire to electrically connect the second source/drain electrode and the second gate electrode, and an upper electrode of the capacitor; and wherein the etching stop layer contacts the bottom electrode of the capacitor.