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US 12,111,469 B2Granted
Polarization adaptive waveguide HUD
AssigneeGM Global Technology Operations LLC
InventorsThomas A. Seder, Kai-Han Chang
Life of this patent
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Abstract
A head-up display system includes 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 in front of the waveguide assembly, and a waveplate positioned between the waveguide and the glare control prism, the waveplate adapted to adjust the polarization of the holographic image.
Claims20
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.
2 more elements
A waveguide assembly, comprising:
- a waveguide adapted to be positioned in front of a hologram projector, wherein a holographic image projected by the hologram projector passes through the waveguide;
- a glare control prism positioned relative to the waveguide assembly, wherein the holographic image projected by the hologram projector exits the waveguide and passes through the glare control prism, the glare control prism adapted to allow a holographic image 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 a holographic image passing through the waveguide.
1 more element
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 assembly, wherein the holographic image projected by the hologram projector exits the waveguide and passes through the glare control prism, and 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 ratio of s-polarization to p-polarization in the holographic image projected through the waveplate, wherein the waveplate is one of:
- an inorganic birefringent film comprising columnar nanostructures that are formed by oblique deposition that is one of grown directly on the glare control prism, and laminated to the glare control prism;
- and
- a liquid crystal lens connected to a voltage source, wherein the birefringent characteristics of the liquid crystal lens vary as the voltage supplied to the liquid crystal lens is varied.
5 more elements
Dependencies are inferred from the claim text.