Image device with a compact homogenizer
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.
1. 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.
2. The image device according to claim 1 , wherein
the display device having the image generating apparatus further comprises an apparatus formed as a LCOS, LCD or Micromirror Device.
3. The image device according to claim 1 , wherein
the lights projected from the light source are projected and reflected by the flat surfaces of waveguide through total-internal-reflection.
4. The image device according to claim 1 ,
the light source further comprises a three-color RGB LED light source.
5. The image device according to claim 1 ,
the light source further comprises a light source irradiates continuous color spectrums lights.
6. 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.
7. The image device according to claim 6 , wherein
the display device further comprises a Micromirror Device.
8. The image device according to claim 6 , wherein:
the lights projected from the light source are projected directly and reflected by the Fresnel mirror toward the display device.
9. The image device according to claim 6 , wherein,
the light source further comprises a three-color RGB LED light source.
10. The image device according to claim 6 ,
the light source further comprises a light source irradiates continuous color spectrums lights.