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. 06, 1999
Filed:
Aug. 07, 1998
Robert Akins, Palatine, IL (US);
George M Ventouris, Lake Zurich, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A cholesteric liquid crystal display device with improved display images is provided. The device includes a transparent front plate (16) with a front conductive film (18) spaced apart from a back conductive film (22) by a gap filled with cholesteric liquid crystal material (24) which can be switched between a transparent state and a reflective state through application of an electric field. The front conductive film (18) is coated with an opaque mask which defines openings (36) for transmitting light. In the reflective state, ambient light entering the device (10) is reflected by the cholesteric liquid crystal (24) through openings (36) in the opaque mask (12) to form a bright image. In the transparent state, ambient light entering the device (10) passes through the cholesteric liquid crystal (24), front film (18) and back film (22) and is substantially absorbed by an underlying opaque layer (14) which is preferably color-matched to the internal mask (12) to form an single color, image-free display area.