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:
Dec. 14, 1982
Filed:
Nov. 15, 1979
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A driving circuit is provided for coloring and erasing a plurality of segment electrodes contained within an electrochromic display. The driving circuit comprises a first circuit for applying a constant current to at least one of the segment electrodes for coloring purposes, a second circuit for short circuiting the colored ones of the segment electrodes, and a third circuit for applying a constant voltage to at least one of the colored segment electrodes for erasing purposes. A plurality of pulses respectively resulting from the constant current and the constant voltage are applied to the selected segment electrodes on timesharing basis. The second circuit comprises a circuit element belonging to a part of the first circuit or a third circuit.