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:
Nov. 13, 1990
Filed:
Jul. 21, 1988
Applicant:
Inventors:
Francesco Principe, Bari, IT;
Vito Gargano, Bitetto, IT;
Assignee:
Nuovopignone-Industrie Meccaniche e Fonderia S.p.A., Florence, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ; G08B / ;
U.S. Cl.
CPC ...
340825060 ; 340715 ; 340765 ; 340642 ;
Abstract
A method for continuously and automatically monitoring the electrical operability and control reliability in a liquid crystal display unit and comprising, inter alia, determining the discharge or charge time of a capacitor comprised of a segment and the backplate or return electrode of the display unit when a voltage waveform fed to the segment has been disconnected, said time being determined by a binary counter which commences at the moment of disconnection of the feed waveform and stops when the capacitive discharge or charge waveform differs in binary state from the value of the segment feed wave.