Rob Brown. Head Up Display Background. Classical Optics. Waveguide Optics. Classical Optics. Waveguide Displays. Vuzix. Sony. Waveguide combiner using diffraction gratings. Light from the collimating optics is diffracted at high angles by the Input Coupler diffraction grating.. ID: 264825
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Waveguide Displays
Rob Brown
Slide2Head Up Display Background
Slide3Classical Optics
Waveguide Optics
Slide4Classical Optics
Slide5Waveguide Displays
Vuzix
Sony
Slide6Waveguide combiner using diffraction gratings
Light from the collimating optics is diffracted at high angles by the Input Coupler diffraction grating.Light propagates down waveguide.Output Coupler diffraction grating diffracts light out of the waveguide a little at a time, so that it can be seen by the pilot.Each bounce produces a virtual image of the collimator, more on that next.
Collimating
Optics
Input Coupler Diffraction Grating
Display Device + Illuminator
To Pilot’s Eyes
`
Continuous output coupling grating with gradient efficiency
Slide7Multiple Beamsplitter Approach
Beamsplitters can be used instead of gratings:
Collimating optics
Eyeball
Faceted optics with coatings
Optics are very expensive to manufacture:
Grind, polish, coat
beamsplitter
Cut into many pieces
Bond assembly
Regrind,
repolish
, AR coat
Artifacts such as bands appear across FOV.
Slide8Single Axis Expansion Visualized
waveguide
collimating lens
expanded pupil
8
9
Slide9Expansion in two dimensions
Vertical Beam Expander
Single Axis Beam Expansion
Collimating Optics Aperture is 0.75” x 3.0”
To Pilot’s Eyes
Output Coupler
Input Coupler
Collimator
Dual Axis Beam Expansion
Collimating Optics Aperture is 0.75” x 0.75”
To Pilot’s Eyes
Horizontal Beam Expander
Slide10Dual Axis Expansion Visualized
collimating lens
laterally expanded pupil
(not visible to pilot)
8
9
8
9
vertically expanded pupil
vertical expansion
Slide11Waveguide display for two eyes
Slide12Slide13Slide14
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