THIN FILM ELECTROLUMINESCENT LINE ARRAY EMITTER/PRINTER
Original Publication Date: 1988-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
The line array emittedprinter disclosed is similar in design to the array emitter and printer disclosed in USP 4,535,341. Figs. 1 and 2, respectively, are the side and top view of a single emitter from a electroluminescent line array comprising a plurality of emitters, e.g.! a pattern of 64 aligned emitters. Two thin film transistors are employed to drive each electroluminescent light emitter. The emitter comprises a layer of ZnS:Mn sandwiched between layers of Y203. The nontransparent metal aluminum electrodes drive the emitter. Thus, light created by the applied electric field cannot exit the emitter in direction perpendicular to the plane of the emitter layers but instead is guided to form an output at the emitter end facets. The resultant effect is to expand the output intensity of the array line emittedprinter by a factor of ten and confine the output to a narrow light emission cone 10, as illustrated in Figs. 1 and 2. Such a line array emitter output would be acceptable for use in conjunction with exposure of a xerographic drum at standard print speeds.