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:
Jan. 25, 1983
Filed:
Feb. 15, 1980
George L Brantingham, Lubbock, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A system and method for driving a multiplexed liquid crystal display (LCD) of duty cycle 1/N is described. The drive system includes M number of segment conductors and N number of drive conductors arranged in a matrix array, the intersection of a drive conductor with a respective segment conductor representing one segment of the display. A signal generator is provided for generating first and second electrical signals having respective first and second predetermined frequencies, the second frequency being substantially greater than the first frequency. A first logic circuit applies the second signal to the drive conductors one-at-a-time in a predetermined sequence and applies the first signal during the remainder of the cycle. Similarly, a second logic circuit responsive to data signals indicative of the information to be displayed applies segment signals representing the ON/OFF states of each segment to the respective segment conductors. Each segment signal is comprised of a series of second signal components. The resultant signal applied to the ON segments has a higher frequency than that of the resultant signal applied to the OFF segments.