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:
Sep. 26, 1978
Filed:
May. 03, 1971
Charles R Stein, Schenectady, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A system of selectively controlling the light scattering areas or sites of nematic liquid crystal display devices of the type including a thin layer of the liquid crystal with conductors on opposite sides thereof, preferably transparent conductors, is described. The device is subjected to a frequency substantially above the critical frequency to maintain it in a non-light scattering state even in the presence of a voltage tending to render it light scattering. The particular sites to be rendered light scattering are selected by removing the high frequency voltage at those sites coincidentally with the application of a turn-on voltage to the same site. The circuit provides for a display of data which is utilized to control either the application of the turn-on voltage or the removal of the high frequency or hold-off voltage. The application of the other voltage to different cells or different conductors of the same cell is controlled sequentially and repetitively at a rate greater than that corresponding to the refresh time of the liquid crystal material.