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. 25, 1997
Filed:
Aug. 10, 1993
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A display device comprises a liquid crystal spatial light modulator (1) associated with diffractive means, such as a diffraction grating comprising grating elements (5). The diffraction grating is illuminated by a light source (6, 7) and each element is chirped and blazed so as to separate the primary colors of the illuminating light and direct them to individual light-modulating elements (R, G, B) of the modulator (1). By dispensing with conventional color filters, the efficiency of the display device is improved. Further, the focusing action of the grating elements (5) directs light to the elements of the modulator (1) so as to prevent light wastage caused by blocking of light by opaque regions of the display.