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:
Jul. 30, 1991
Filed:
Apr. 27, 1989
Chiyoaki Iijima, Suwa, JP;
Yuzuru Sato, Suwa, JP;
Hiroshi Wada, Suwa, JP;
Osamu Okumura, Suwa, JP;
Satoshi Kamada, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An electro-optical device includes at least two adjacent transparent twisted nematic liquid crystal cells, each cell having a twisted nematic liquid crystal with a twist angle greater than 90.degree. between a pair of spaced apart opposed substrates with electrodes selectively disposed thereon. A linear polarizer is disposed on an exterior surface of each of the two cells. One of the two cells includes a plurality of electrodes for selectively producing a desired display. Application of a suitable voltage to the second cell compensates for changes in ambient temperature conditions or undesirable thicknesses in the liquid crystal materials of the two cells to ensure that a monochromatic display having excellent contrast is produced by the device and compensates for elliptically polarized light emitted by the first cell so that the device produces substantially linearly polarized light.