Scanned beam display having high uniformity and diminished coherent artifacts
AssigneeMicrovision, Inc.
InventorKarlton D. Powell
Life of this patent
Estimating the term…
Abstract
Briefly, in accordance with one or more embodiments, time averaged Moiré patterns may be utilized in a scanned beam display having a Gaussian beam profile or the like in order to tailor uniformity of the image by controlling both the near field and far field regions of the display to result in a stable and uniform scanned beam display image. Consideration is made regarding the light source parameters of focus numerical aperture, profile, shape, and/or wavelength to achieve higher uniformity and stability without resulting in significant visible coherent artifacts such as tiled intensity patterns and/or Moiré.
Claims13
A method, comprising:
- emitting a beam having a non-top hat beam profile;
- scanning the beam in a raster scan across an exit pupil expander to project an image to be displayed in an eyebox, the exit pupil expander comprising an array of cells, one or more of the cells having a transmission function;
- and
- generating a diffraction envelope from two or more spot profiles resulting from a scan line of the raster scan in the cells of the array of cells;
- wherein a time averaged diffraction envelope is generated in the eyebox from the diffraction envelope from the two or more spots to reduce Moiré in the projected image.
A scanned beam display, comprising:
- a laser source capable of emitting a beam having a non-top hat beam profile;
- an exit pupil expander comprising an array of cells, one or more of the cells having a transmission function;
- and
- a scanning mirror capable of scanning the beam in a raster scan across the exit pupil expander to project an image to be displayed in an eyebox;
- and
- wherein the laser source in conjunction with the scanning mirror are capable of generating a diffraction envelope from two or more spot profiles resulting from a scan line of the raster scan in the cells of the array of cells, wherein a time averaged diffraction envelope is generated in the eyebox from the diffraction envelope from the two or more spot profiles to reduce Moiréin the projected image.
An apparatus, comprising:
- a light source capable of emitting a beam having a non-top hat beam profile;
- and
- a scanner capable of scanning the beam in a raster scan across an exit pupil expander to project an image to be displayed, the exit pupil expander comprising an array of cells, one or more of the cells having a transmission function;
- wherein the light source in conjunction with the scanner are capable of generating a diffraction envelope from two or more spot profiles resulting from scan lines of the raster scan in a cell of the exit pupil expander, wherein a time averaged diffraction envelope is generated from the diffraction envelope from the two or more spot profiles to reduce Moiréin the projected image.
Dependencies are inferred from the claim text.