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. 07, 2004
Filed:
Oct. 01, 2002
Anthony D. McGettigan, Santa Rosa, CA (US);
Markus Duelli, Santa Rosa, CA (US);
JDS Uniphase Corporation, San Jose, CA (US);
Abstract
A integrating light pipe re-circulates color to improve efficiency. A number of color filters, such as blue, green, and red filters, on the end of the light pipe transmit a selected color and reflect the remaining light back into the light pipe, where it is spatially homogenized and re-circulated back to the output of the light pipe. The re-circulated homogenized light illuminates the filters, and the process repeats. Thus, most of the light from the light source eventually is transmitted through one of the color filters. The filters can provide straight boundaries between the resultant color beams, which are provided to a scrolling element, such as a rotating prism, rotating mirror drum, or linear oscillating optical element, and hence to a light valve. The combination of the re-circulating light pipe and scrolling element provide continuous color scrolling and efficient use of the broad-spectrum light from the light source.