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. 09, 1992
Filed:
May. 03, 1989
Dan J Schott, Phoenix, AZ (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
A contrast enhancement filter for color displays, particularly adapted for color CRT tubes of the shadow mask type. A transparent plate has applied thereon absorptive areas, each area dyed with a primary color corresponding to the color dots of the CRT display face and a plurality of such color areas randomly disposed over each color dot. Since the absorption areas are spacially independent, each color area acts independently of the others. The filter provides bandpass efficiency comparable to monochrome filters, and has a broad viewing range essentially independent of angle of vision. In a further embodiment, colored oriented fiber-optic elements are disposed over the phosphor dots in a predetermined array, allowing the filter plate to replace a conventional faceplate and filter combination structure, while providing a selective viewing angle of high contrast. The filter is suitable for any light-responsive display screen, also including liquid crystal elements.