The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1981
Filed:
Jan. 07, 1980
Paul O Haugsjaa, Acton, MA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
Abstract
A display system includes a plurality of thin-film electroluminescent elements each having a digit electrode and a segment electrode, a set of digit drivers, and a set of segment drivers. The digit drivers and the segment drivers are operative, during precharging portions of digit and segment control signals, to precharge the elements of the display by applying a first voltage to the digit electrode and a second voltage to the segment electrode of each element. The digit drivers are further operative, during addressing portions of the digit control signal, to selectively address elements of the display by applying the second voltage to the digit electrodes of the elements which are to be addressed and by applying the first voltage to the digit electrodes of the elements which are not to be addressed. The segment drivers are further operative, during energizing portions of the segment control signal, to selectively energize elements which are addressed by applying the first voltage to the segment electrodes of the elements which are to be energized and by applying the second voltage to the segment electrodes of the elements which are not to be energized. The first voltage can be ground potential and the second voltage can be a positive dc voltage which is greater than the threshold voltage of the electroluminescent elements.