Means to increase the light output by the illuminator in a LCoS based light engine
OwnerArthur Berman, Ying-Moh Liu +2inventors
InventorsArthur Berman, Ying-Moh Liu, Glenn Wheelock, John Carpenter
Life of this patent
Estimating the term…
Abstract
A phosphor layer is positioned to absorb UV light and re-radiate usable light in other wavelengths. The UV light is reflected to the phosphor by a thin film placed in a light path. The phosphor re-radiates the usable light in a direction of the light path. Curved mirrors or directive reflectors are utilized to direct some of the re-radiated light toward the light path. In one embodiment, usable light in the light path is reflected by a thin film, UV light is passed by the thin film toward the phosphor, and the re-radiated light is directed toward the reflected visible light path.
Claims21
An illuminator, comprising:
- a UV reflector having properties that reflect light in UV wavelengths and passes light in other wavelengths;
- and
- a phosphor layer in a path of the UV reflected light.
An illuminator, comprising:
- a light source;
- a source reflector configured to direct light emanating from the light source in a path toward a target position;
- a UV sensitive layer positioned in the path;
- and
- a phosphor layer positioned to absorb light from the light source.
An illuminator comprising:
- a light source;
- a phosphor layer positioned to absorb only UV light from the light source and re-radiate visible light.
Dependencies are inferred from the claim text.