Projection display surface providing speckle reduction

Details Projection display surface providing speckle reduction Projection display surface providing speckle reduction

2010-06-16

2011-12-27

Mahoney, Christopher (Department: 2862)

Optical: systems and elements

Projection screen

C353S029000

Reexamination Certificate

active

08085467

ABSTRACT:
A projection display surface for reducing speckle artifacts from a projector having at least one narrow band light source having an incident visible wavelength band, wherein the incident visible wavelength band has an incident peak wavelength and an incident bandwidth, comprising: a substrate having a reflective layer that reflects incident light over at least the incident visible wavelength band; and a fluorescent agent distributed over the reflective layer, wherein the fluorescent agent absorbs a fraction of the light in the incident visible wavelength band and emits light in an emissive visible wavelength band having an emissive peak wavelength and an emissive bandwidth; wherein return light from the projection display surface produced when incident light in the incident visible wavelength band is incident on the projection display surface contains light in both the incident visible wavelength band and emissive visible wavelength band, thereby reducing speckle artifacts.

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