Patent ID: 6988806
Filing Date: 2006-01-24
Classification: G03B,H04N

Abstract:
1. An image projection system comprising: a primary light source to propagate a polychromatic light along a primary light path; an auxiliary light source to propagate a compensating light to compensate the polychromatic light for at least brightness during an initial period; an optical integrating device, disposed along the primary light path and having a light tunnel within which light propagating through the light tunnel undergoes multiple occurrences of reflection so that light exiting the light tunnel is of substantially uniform light intensity, the optical integrating device being optically coupled to the primary and auxiliary light sources in a manner to receive the polychromatic and compensating lights separately, but coinciding upstream of or substantially at a location where the first reflection of light occurs; and an imaging arrangement optically coupled to the optical integrating device to project an image using the exiting light.