Pupil steered display
AssigneeFacebook Technologies, LLC
InventorsWeichuan Gao, Ying Geng
Life of this patent
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Abstract
A display device may include a plurality of tiled spatial light modulators (SLMs) imparting image information upon respective light beams to obtain image beams. Pupil steering optics are configured to steerably direct the image beams towards a same or different exit pupil locations within an eyebox of the display device, providing exit pupil replication and/or an expanded field of view. An eye tracking system provides location information of the user's eye, enabling the pupil steering optic to direct at least some of the image beams to a desired exit pupil location.
Claims20
A display device comprising:
- a first spatial light modulator (SLM) configured to impart first image information upon a first light beam to provide a first image beam;
- a second SLM configured to impart second image information upon a second light beam to provide a second image beam;
- and
- at least one pupil steering optic (PSO) operable to direct the first and second image beams toward at least one first exit pupil location responsive to one or more first control signals, and to direct the first and second image beams toward at least one second exit pupil location responsive to one or more second control signals.
The display device of claim 1 further comprising:
- an eye tracking module configured to provide eye position information;
- and
- a controller operatively coupled to the eye tracking module and configured to provide the one or more first control signals or the one or more second control signals to the at least one PSO in dependence on the eye position information.
The display device of claim 1 further comprising at least one optical source configured to provide the first and second light beams.
The display device of claim 1 comprising folded optic disposed in an optical path of at least one of the first and second image beams.
A method for displaying an image to a user, the method comprising:
- obtaining eye position information for an eye of the user;
- encoding image information onto a plurality of spatial light modulators (SLM);
- illuminating the plurality of SLMs with at least partially coherent light beams to obtain a plurality of image beams;
- passing the plurality of image beams through a pupil steering optic configured to operate in a plurality of states supporting a plurality of exit pupil locations, wherein in at least one of the states at least two of the image beams are received at one or more exit pupil locations in distinct solid angles;
- and
- controlling the pupil steering optic to steer the plurality of image beams toward at least one of the exit pupil locations responsive to the eye position information.
A holographic projector comprising:
- first and second spatial light modulators configured to impart first and second image information upon first and second light beams, respectively, to obtain image light carrying an image in angular domain;
- and
- a pupil steering optic optically coupled to the first and second spatial light modulators for conveying the image light to an exit pupil of the holographic projector, wherein the first and second image information correspond to first and second portions, respectively, of the image in angular domain at the exit pupil thereof.
Dependencies are inferred from the claim text.