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US 11,231,529 B2Granted
Light source for projection display
AssigneesFusho Ishii, Ntt Docomo, Inc.
InventorsFusao Ishii, Mikiko Nakanishi, Kazuhiko Takahashi, Yuji Aburakawa
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Abstract
A compact integrator of light beams is disclosed using a diffractive optical element to integrate multiple beams into a single beam regardless of wavelength or polarization.
Claims10
An optical integrator of light beams comprising:
- a plurality of light emitting sources each emitting a light beam of different wavelengths along different directions to a diffractive optical element (DOE) having a structure of transparent layers slantly stacked and oriented along an angle relative to a perpendicular normal direction relative a surface of the DOE facing the light beams from the light emitting sources wherein each of the transparent slantly oriented layers having different refractive indices to bend and diffract each of the beams according to a Bragg's diffraction law to a single combined beam projected along a targeted direction;
- and
- wherein the transparent layers slantly stacked and oriented along an angle relative to the, perpendicular normal direction relative the surface of the DOE further comprises multi-layers having at least two different materials with different refractive indices.
An optical integrator of light beams comprising:
- a plurality of light emitting sources each emitting a light beam of a different color along different directions to a diffractive optical element (DOE) having a free-form HOE/DOE wherein the free-form DOE is designed to diffract and focus the beams into a light pipe and wherein the beams are mixed and homogenized to combine the beams for projecting to a single targeted direction;
- and
- the DOE further comprises transparent layers slantly stacked and oriented along an angle relative to a perpendicular normal direction relative a surface of the DOE and wherein the transparent layers having at least two different materials with different refractive indices.
Dependencies are inferred from the claim text.