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:
Feb. 29, 2000
Filed:
Sep. 14, 1998
Mineto Yagyu, Sagamihara, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A spatial light modulator is formed of a pair of transparent substrates, and a photoconductor layer, an optical modulation layer and a color filter layer disposed in lamination between the substrates. The photoconductor layer is designed to have a spectral sensitivity characteristic including an average sensitivity to blue light, an average sensitivity to green light and an average sensitivity to red light, of which a maximum and a minimum provide a ratio. S.sub.MAX /S.sub.MIN therebetween of at most 10, and a spectral transmittance characteristic including an average transmittance in a wavelength range of 420-480 nm, an average transmittance in a wavelength range of 520-560 nm and an average transmittance in a wavelength range of 600-660 nm, of which a maximum and a minimum provide a ratio T.sub.MAX /T.sub.MIN of at most 10. As a result, it becomes possible to provide a compact picture-forming and display apparatus of a see-through type by disposing a white writing light source and a white reading light source on a same side of the spatial light modulator.