Optical system with polarization volume hologram
AssigneeFacebook Technologies, LLC
InventorsAndrew John Ouderkirk, Hannah Noble, Babak Amirsolaimani, Yusufu Njoni Bamaxam Sulai
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Abstract
An optical system includes an optical lens, a polarization volume hologram (PVH) layer arranged over the optical lens, and an IR absorbing structure arranged between the optical lens and the PVH layer. The PVH layer being configured to reflect infrared (IR) light. The IR absorbing structure includes a quarter-wave plate (QWP) arranged between the optical lens and the PVH layer and a linear absorptive polarizer arranged between the QWP and the optical lens. The linear absorptive polarizer is configured to absorb IR light.
Claims17
An optical system comprising:
- a display screen;
- an optical lens;
- a polarization volume hologram (PVH) layer configured to reflect an infrared (IR) light, wherein the display screen and the PVH layer are disposed at opposite sides of the optical lens;
- and
- an IR absorbing structure arranged between the optical lens and the PVH layer, the IR absorbing structure including:
- a quarter-wave plate (QWP) arranged between the optical lens and the PVH layer;
- and
- a linear absorptive polarizer arranged between the QWP and the optical lens, the linear absorptive polarizer being configured to absorb the IR light.
An optical system comprising:
- an optical lens;
- a polarization volume hologram (PVH) layer arranged over the optical lens, the PVH layer being configured to reflect a first component of an infrared (IR) light away from the optical lens, and transmit a second component of the IR light toward the optical lens, polarizations of the first component and the second component having orthogonal handednesses;
- and
- an absorbing film including an IR light absorbing material and arranged between the optical lens and the PVH layer, the absorbing film configured to absorb the second component of the IR light output from the PVH layer toward the optical lens.
An optical system comprising:
- an optical lens;
- a first polarization volume hologram (PVH) layer arranged over the optical lens;
- and
- a second PVH layer arranged between the optical lens and the first PVH layer;
- wherein the first PVH layer and the second PVH layer are configured to reflect an IR light,
- wherein the first PVH layer is configured to reflect a first component of the IR light and transmit a second component of the IR light toward the second PVH layer and the optical lens, polarizations of the first component and the second component having orthogonal handednesses, and
- wherein the second PVH layer is configured to reflect the second component of the IR light back to the first PVH layer and away from the optical lens, and
- wherein the optical lens includes:
- a partial reflector;
- a reflective polarizer arranged between the partial reflector and the second PVH layer;
- and
- a quarter-wave plate arranged between the partial reflector and the second PVH layer.
Dependencies are inferred from the claim text.