Patent ID: 8469519
Filing Date: 2013-06-25
Classification: G03B,H04N

Abstract:
1. A projection apparatus for producing color images having reduced speckle artifacts comprising: a) at least three narrow band light sources having first, second and third visible wavelength bands, respectively, wherein each visible wavelength band has an associated peak wavelength and an associated bandwidth; b) a digital image source providing color digital image data; c) at least one spatial light modulator for forming a color image using light from the at least three narrow band light sources responsive to the color digital image data; d) a projection display surface including: e) projection optics that project the color image onto the projection display surface; wherein return light from the projection display surface produced when incident light in the first incident visible wavelength band is incident on the projection display surface contains both reflected light in the first incident visible wavelength band was not absorbed by the fluorescent agent and was reflected from the substrate and light in the first emissive visible wavelength band that was emitted by the fluorescent agent, the reflected light in the incident visible wavelength band being at least 60% of the incident light in the incident visible band, thereby providing projected images having reduced speckle contrast relative to projected images formed on a projection display surface that does not include the fluorescent agent.