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:
Mar. 15, 2005
Filed:
Jul. 03, 2001
Martin Stalder, Oberwil, CH;
Martin Schadt, Seltisberg, CH;
Martin Stalder, Oberwil, CH;
Martin Schadt, Seltisberg, CH;
Rolic AG, Zug, CH;
Abstract
A liquid crystal electrooptical element is disclosed that comprises a pair of substrates positioned between a pair of polarising plates, electrodes defining pixel areas and alignment layers disposed on the respective opposing inside surfaces of the substrates, and a chiral nematic liquid crystal sandwiched between the pair of surfaces. At least one of the alignment layers may be patterned in such a way that the azimuth or pretilt or both alignment directions are different at the substrate interfaces suppressing the growth of the ground state of the liquid crystal. When an initial electrical pulse is applied, one of the at least two bistable states can be reached, wherein the contrast ratio between the bistable states is two or greater. A device with such features is long-term bistable and does not require electronic refreshing as long as the displayed information is not changed. Therefore, the power consumption of this bistable device is minimal.