US 12,111,469 B2
Polarization adaptive waveguide HUD
Thomas A. Seder, Fraser, MI (US); and Kai-Han Chang, Madison Heights, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Sep. 22, 2021, as Appl. No. 17/481,900.
Prior Publication US 2023/0091935 A1, Mar. 23, 2023
Int. Cl. G02B 27/01 (2006.01); G02B 5/30 (2006.01); G03H 1/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/3083 (2013.01); G03H 1/0005 (2013.01); G02B 2027/0174 (2013.01); G03H 2001/0088 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A head-up display system, comprising:
a hologram projector adapted to project a holographic image;
a waveguide positioned in front of the hologram projector, wherein the holographic image projected by the hologram projector passes through the waveguide;
a glare control prism positioned relative to the waveguide, wherein the holographic image projected by the hologram projector exits the waveguide and passes through the glare control prism, the glare control prism is adapted to allow the holographic image projected by the hologram projector to pass from the waveguide through the glare control prism and to prevent ambient light that hits the glare control prism from passing through the glare control prism to the waveguide; and
a waveplate positioned between the waveguide and the glare control prism, the waveplate adapted to adjust the polarization of the holographic image.