Hologram waveguiding
AssigneeDualitas Ltd
InventorJamieson Christmas
Life of this patent
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Abstract
A method of head-up display for a vehicle. A first step comprises displaying a hologram of an image on a display device and spatially modulating light in accordance with the displayed hologram to form a holographic wavefront. A second step comprises replicating the holographic wavefront in a first direction using a first pupil expander to form a 1D array of replicas of the holographic wavefront. A third step comprises using a windscreen of the vehicle as a second pupil expander to form a 2D array of replicas of the holographic wavefront from the 1D array of replicas.
Claims16
A method of head-up display for a vehicle, the method comprising:
- displaying a hologram of an image on a display device and spatially modulating light in accordance with the displayed hologram to form a holographic wavefront;
- replicating the holographic wavefront in a first direction using a first pupil expander to form a 1D array of replicas of the holographic wavefront;
- and
- waveguiding the 1D array of replicas of the holographic wavefront between an inside surface and an outside surface of a windscreen of the vehicle, the waveguiding comprising a plurality of partial transmission-reflections at a plurality of different parts on the inside surface of the windscreen to form a 2D array of replicas of the holographic wavefront from the 1D array of replicas.
A system comprising:
- a light engine comprising:
- a display device arranged to display a hologram of an image and spatially modulate light in accordance with the displayed hologram to form a holographic wavefront;
- and a first pupil expander arranged receive the holographic wavefront and replicate the holographic wavefront in a first direction to form a 1D array of replicas of the holographic wavefront;
- and
- a windscreen of a vehicle arranged to receive the 1D array of replicas of the holographic wavefront from the first pupil expander and expand the 1D array of replicas in a second direction, orthogonal to the first direction, and to waveguide the 1D array of replicas of the holographic wavefront between an inside surface and an outside surface of the windscreen, the waveguiding comprising a plurality of partial transmission-reflections at a plurality of different parts on the inside surface of the windscreen, to form a 2D array of replicas of the holographic wavefront.
Dependencies are inferred from the claim text.