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:
Jun. 26, 1984
Filed:
Aug. 12, 1982
Donald V DiMassimo, Liverpool, NY (US);
John B May, Liverpool, NY (US);
General Electric Company, Syracuse, NY (US);
Abstract
The present invention relates to a PMOS or NMOS driver for a liquid crystal display. The driver is designed for ac excitation of the display with a minimum dc component, and with minimum excitation of 'off' segments for optimum display performance. The drive circuitry includes a pair of larger capacity drivers, which exhibit alternate high and low output states, between which the individual segments and the backplane of the display are connected for ac excitation. A pair of lower capacity switches are provided in association with each segment. The first lower capacity switch connects the segment to be activated to one of the drivers, and a second switch, maintained in a state alternate to that of the first switch, disconnects that segment from the backplane. When the segment switches are turned on strongly, as by a voltage doubling input circuit, the desired LCD driver performance is achieved using a non-complementary design of lower cost than the conventional CMOS driver.