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:
Aug. 14, 1984
Filed:
Jan. 05, 1983
Mitsuhiro Murata, Tanashi, JP;
Tomoko Tsunesumi, Tanashi, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
In an electronic timepiece provided with an electrochromic display device, temperature monitor circuit means are provided for periodically sampling the ambient operating temperature of the timepiece, to detect if that temperature is above an upper limit temperature. If that is detected, then a control circuit causes the display drive circuit of the timepiece to be inhibited from applying new write drive signals to the electrochromic display device, i.e. signals for setting display elements into the colored state. As a result, reduction of the operating lifetime of the electrochromic display device due to write-in operations being performed thereon under high temperature conditions is prevented.