SYSTEMS, DEVICES, AND METHODS FOR ANGLE- AND WAVELENGTH-MULTIPLEXED HOLOGRAPHIC OPTICAL ELEMENTS
First Claim
1. An angle- and wavelength-multiplexed holographic optical element (“
- HOE”
) comprising;
at least one layer of holographic material that includes;
a first set of wavelength-multiplexed holograms, wherein each respective hologram in the first set of wavelength-multiplexed holograms is responsive to light of a respective wavelength and unresponsive to light of other wavelengths, and wherein all of the holograms in the first set of wavelength-multiplexed holograms are responsive to light that is incident thereon with an angle of incidence that is within a first range of angles of incidence and unresponsive to light that is incident thereon with an angle of incidence that is outside of the first range of angles of incidence; and
a second set of wavelength-multiplexed holograms, wherein each respective hologram in the second set of wavelength-multiplexed holograms is responsive to light of a respective wavelength and unresponsive to light of other wavelengths, and wherein all of the holograms in the second set of wavelength-multiplexed holograms are responsive to light that is incident thereon with an angle of incidence that is within a second range of angles of incidence and unresponsive to light that is incident thereon with an angle of incidence that is outside of the second range of angles of incidence, the second range of angles of incidence different from the first range of angles of incidence.
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Accused Products
Abstract
Systems, devices, and methods for combined angle- and wavelength multiplexing in holographic optical elements (“HOE”) are described. An angle- and wavelength-multiplexed HOE includes multiple angle-multiplexed sets of wavelength-multiplexed holograms. Each set of wavelength-multiplexed holograms includes at least two holograms that are each responsive to a different wavelength of light. Each angle-multiplexed set of wavelength-multiplexed holograms includes a respective set of wavelength-multiplexed holograms that are all responsive to light that is incident thereon with and angle of incidence that is within a particular range. An example application is described in which an angle- and wavelength-multiplexed HOE is used as a holographic combiner in a wearable heads-up display, where angle-multiplexing provides multiple spatially-separated exit pupils in the eyebox of the display and wavelength-multiplexing provides multiple colors to each respective exit pupil.
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Citations
24 Claims
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1. An angle- and wavelength-multiplexed holographic optical element (“
- HOE”
) comprising;at least one layer of holographic material that includes; a first set of wavelength-multiplexed holograms, wherein each respective hologram in the first set of wavelength-multiplexed holograms is responsive to light of a respective wavelength and unresponsive to light of other wavelengths, and wherein all of the holograms in the first set of wavelength-multiplexed holograms are responsive to light that is incident thereon with an angle of incidence that is within a first range of angles of incidence and unresponsive to light that is incident thereon with an angle of incidence that is outside of the first range of angles of incidence; and a second set of wavelength-multiplexed holograms, wherein each respective hologram in the second set of wavelength-multiplexed holograms is responsive to light of a respective wavelength and unresponsive to light of other wavelengths, and wherein all of the holograms in the second set of wavelength-multiplexed holograms are responsive to light that is incident thereon with an angle of incidence that is within a second range of angles of incidence and unresponsive to light that is incident thereon with an angle of incidence that is outside of the second range of angles of incidence, the second range of angles of incidence different from the first range of angles of incidence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- HOE”
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12. A wearable heads-up display (“
- WHUD”
) comprising;a support structure that in use is worn on a head of a user; a scanning laser projector carried by the support structure; and an angle- and wavelength-multiplexed holographic combiner carried by the support structure, wherein the angle- and wavelength-multiplexed holographic combiner is positioned within a field of view of an eye of the user when the support structure is worn on the head of the user, and wherein the angle- and wavelength-multiplexed holographic combiner comprises at least one layer of holographic material, the at least one layer of holographic material including; a first set of wavelength-multiplexed holograms, wherein each respective hologram in the first set of wavelength-multiplexed holograms is responsive to light of a respective wavelength and unresponsive to light of other wavelengths, and wherein all of the wavelength-multiplexed holograms in the first set of wavelength-multiplexed holograms are positioned and oriented to converge light from the scanning laser projector that is incident thereon with an angle of incidence that is within a first range of angles of incidence to a same first exit pupil at or proximate the eye of the user; and a second set of wavelength-multiplexed holograms, wherein each respective hologram in the second set of wavelength-multiplexed holograms is responsive to light of a respective wavelength and unresponsive to light of other wavelengths, and wherein all of the wavelength-multiplexed holograms in the second set of wavelength-multiplexed holograms are positioned and oriented to converge light from the scanning laser projector that is incident thereon with an angle of incidence that is within a second range of angles of incidence to a same second exit pupil at or proximate the eye of the user, the second exit pupil spatially-separated from the first exit pupil at the eye of the user and the second range of angles of incidence different from the first range of angles of incidence. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
- WHUD”
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21. A method of operating a wearable heads-up display (“
- WHUD”
), the WHUD including a scanning laser projector and an angle- and wavelength-multiplexed holographic combiner positioned within a field of view of an eye of a user when the WHUD is worn on a head of the user, the method comprising;directing a first light signal towards the angle- and wavelength-multiplexed holographic combiner at a first angle of incidence by the scanning laser projector, wherein the first light signal comprises a first wavelength of laser light; directing a second light signal towards the angle- and wavelength-multiplexed holographic combiner at the first angle of incidence by the scanning laser projector, wherein the second light signal comprises a second wavelength of laser light; redirecting the first light signal towards a first exit pupil at or proximate the eye of the user by a first hologram in a first set of wavelength-multiplexed holograms of the angle- and wavelength-multiplexed holographic combiner; redirecting the second light signal towards the first exit pupil at or proximate the eye of the user by a second hologram in the first set of wavelength-multiplexed holograms of the angle- and wavelength-multiplexed holographic combiner; directing a third light signal towards the angle- and wavelength-multiplexed holographic combiner at a second angle of incidence by the scanning laser projector, wherein the second angle of incidence is different from the first angle of incidence and the third light signal comprises the first wavelength of laser light; directing a fourth light signal towards the angle- and wavelength-multiplexed holographic combiner at the second angle of incidence by the scanning laser projector, wherein the fourth light signal comprises the second wavelength of laser light; redirecting the third light signal towards a second exit pupil at or proximate the eye of the user by a first hologram in a second set of wavelength-multiplexed holograms of the angle- and wavelength-multiplexed holographic combiner; and redirecting the fourth light signal towards the second exit pupil at or proximate the eye of the user by a second hologram in the second set of wavelength-multiplexed holograms of the angle- and wavelength-multiplexed holographic combiner. - View Dependent Claims (22, 23, 24)
- WHUD”
Specification