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:
Apr. 18, 2000
Filed:
Sep. 29, 1997
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A liquid crystal device comprises plural pixel electrodes arranged in a matrix form, a common electrodes facing the pixel electrodes, a liquid crystal layer sandwiched therebetween, and plural switches to drive the respective pixel electrodes. A reflectivity or transmittance of the liquid crystal varies according to a first state where a direction of a normal to each of the liquid crystal is the same, a second state where the above direction of the normal is at random, and a third state where a spiral structure of the liquid crystal is untied, and has a hysteresis characteristics with respect to an applied voltage including an insensitive voltage region where a reflectivity or transmission state is not determined by the applied voltage. The device has an operation such that the applied voltage is brought into the insensitive voltage region, after a display signal is written into the pixel electrode, to hold the display state.