In the method of the present invention, a bottom electrode having a planar sheet of conducting material is first deposited on a substrate. A mask is then deposited on the bottom electrode to define wells. For at least first and second ones of the wells defined by the mask, an electroluminescent material...http://www.google.de/patents/US6087771?utm_source=gb-gplus-sharePatent US6087771 - Electroluminescent display and method for making the same
