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:
Nov. 25, 1980
Filed:
Nov. 21, 1978
Mitsuo Nagata, Suwa, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
A liquid crystal display device suitable for a matrix display of a large number of lines of picture cells can nevertheless provide high contrast. The liquid crystal material used in the device is suitable for operating in the twisted nematic mode and has a dielectric anisotropy which is positive at low frequency and negative at high frequency. A timing signal is provided to the picture cell, the timing signal comprising a high frequency component and a low frequency component such that the dielectric anisotropies of the liquid crystal are at least nearly equal and opposite in sign. In addition a data signal is supplied, said data signal being equal in frequency to one or the other of the components in the timing signal. The signals are utilized in driving the display by suitable matrix-addressing.