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:
Dec. 31, 1991
Filed:
Dec. 12, 1990
Michael Black, Foster City, CA (US);
Vladimir Kupershmidt, Fremont, CA (US);
Reliant Laser Corp., Foster City, CA (US);
Abstract
A method and apparatus for selectively blocking light beams of different wavelengths with the use of a single color-sensitive filter by passing the beams through a multiple layer system consisting of an input polarization plate (12), an output polarization plate (14), a liquid crystal cell (18) sandwiched between voltage-controlled matrices (20a and 20b), and a mosaic color mask (34). The incident light is detected by a photoelectronic sensor (32) which sends voltage signals to respective pixels (22) which form the above-mentioned matrices. These signals selectively control the polarization states of the beams passed through the respective pixels. Depending on the polarization states of the beams, the output polarization plate can either block the light or pass it to a color mask (34). This mask consists of a periodical set of color cells, the amount and dimensions of which correspond to those of the pixels. As a result, the mask selectively filters the beam in accordance with its pattern.