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US 11,598,971 B2Granted
Image device with a compact homogenizer
AssigneesFusao Ishii, Ntt Docomo, Inc.
InventorsFusao Ishii, Mikiko Nakanishi, Kazuoki Ichikawa, Yuji Aburakawa
Life of this patent
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Abstract
A compact light source for a projection display is disclosed enabling eye-glass display using a Fresnel mirror reflecting light without a distance as conventional prism type reflector.
Claims10
An image device comprising
- a light source irradiating lights of a plurality of visible wavelengths for projecting to a transparent waveguide wherein the transparent waveguide having a saw-tooth shaped Fresnel lens surface disposed on the bottom surface of the waveguide for reflecting the lights as multiple light beams with a parallel optical axis along a vertically upward direction into a Polarized Beam Splitter (PBS) disposed immediately above the waveguide along the vertically upward direction;
- and
- the PBS constituting a cube-like structure having a diagonally oriented internal flat polarizing plate for changing polarizations and reflecting the light beams projected from the waveguide toward a display device having an image generating apparatus to display an image.
An image device comprising
- a light source irradiating lights of a plurality of visible wavelengths for projecting to a transparent waveguide wherein the transparent waveguide having a saw-tooth shaped Fresnel lens surface disposed on the bottom surface of the waveguide for reflecting the lights as multiple light beams with a parallel optical axis along a vertically upward direction into a Polarized Beam Splitter (PBS) disposed immediately above the transparent waveguide along the vertically upward direction;
- and
- the PBS constituting a cube-like structure having a diagonally oriented internal flat polarizing plate for changing polarizations and reflecting the light beams with the parallel optical axis projected from the waveguide toward a display device for generating an image and the display device further reflects the image through the PBS and a lens set toward a total-internal-reflection (TIR) waveguide for propagating the image through and inside the total-internal-reflection (TIR) waveguide with a total internal reflection for reflecting the image to a viewer's eye.
Dependencies are inferred from the claim text.