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:
Jun. 13, 1989
Filed:
Jan. 05, 1988
John M McKee, Coral Springs, FL (US);
Marilyn S Burger, Pompano, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A liquid crystal light emitting display (LCLED) device having two modes of operation. In the first mode the LCLED device produces dark symbols on a light background. In the second mode the LCLED device emits light producing light symbols on a dark background. The LCLED includes a LCD cell having an optically active nematic liquid crystal composition interposed between two parallel glass substrates. The glass substrates having transparent electrode indicia on the inner surfaces. Disposed on the outer surfaces of the glass substrates are polarizers having their axes of polarization orthogonal in the first mode, and their axes of polarization parallel in the second mode. A transparent panel having indicia identical to the electrode indicia is disposed on the exterior of one of the polarizers. The transparent panel is comprised of transparent material having fluorescent dye stuff. The transparent panel is optically connected to a light collecting means. In the second mode, the light collecting means absorbs light from an illumination means and internally reflects the light to the transparent panel indicia. The transparent panel indicia is comprised of a plurality of depressions which intercepts the internally reflected light and emits the light in the shape of the transparent panel indicia, through the LCD cell tot he viewer, thus permitting light against a dark background.