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:
Sep. 19, 1989
Filed:
Nov. 13, 1987
Russell E Tavernetti, San Carlos, CA (US);
Electrohome Limited, Kitchener, CA;
Abstract
A system and method are provided for controlling a characteristic of an optical image generated by a video projection system of the type wherein illumination light is passed through a polarizing means and then directed to a light modulation device which receives a light image and provides an polarization modulated optical image as outgoing light, the outgoing light being passed through a projection lens to display the optical image. According to the present invention, a portion of the outgoing light is sampled and the sampled portion is directed to a detector which detects characteristics of the outgoing light. The detected characteristics are then compared with the corresponding desired characteristics exhibited by a test pattern image. The differences between the detected characteristics and the desired characteristics are measured and the measured differences are utilized to generate correction factors for controlling the outgoing light such that the outgoing light exhibits the desired characteristics.