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:
Mar. 29, 1988
Filed:
Aug. 27, 1985
Jurgen Adams, Villingen-Schwenningen, DE;
Mannesmann Kienzle GmbH, Villingen, DE;
Abstract
A method and arrangement for providing a continuous visual check on the operation of a standard liquid crystal display by superimposing a checking signal upon the operating signals applied to the individual segment and back electrodes of the LCD through individual impedance paths substantially higher than the individual impedance paths carrying the operating signal to the segment and back electrodes so that the operating signal overrides the checking signal under normal circumstances but the checking signal overrides the operating signal when the latter is interrupted due to a fault. The checking signal causes the segment electrode or back electrode whose signal is impaired to blink at a visually perceptible rate. Preferably, the frequency of the checking signal is in the order of 0.5 Hz to 2.0 Hz.