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. 12, 1976
Filed:
Mar. 13, 1975
Ernest C Ho, Newport Beach, CA (US);
Hughes Aircraft Company, Culver City, CA (US);
Abstract
A digital watch system with a dual display demultiplexer, a liquid crystal display for use in daylight or bright light and a light emitting diode display for use in dim light. The digital watch system includes a crystal oscillator with frequency division which controls a set of counters, each counter carrying coded horological data. Selected counter data is multiplexed into a seven segment decoder which is then demultiplexed into memories, one for each of the segments in each of the liquid crystal display digits. These memories then control segment drivers for the liquid crystal digital displays. In parallel with the liquid crystal demultipliexer, the seven segment decoder outputs operate segment and digit drivers which drive light emitting diodes as a second display for the digital watch.