Display system and method for providing variable accommodation cues using multiple intra-pupil parallax views formed by light emitter arrays
A display system is configured to direct a plurality of parallactically-disparate intra-pupil images into a viewer's eye. The parallactically-disparate intra-pupil images provide different parallax views of a virtual object, and impinge on the pupil from different angles. The wavefronts of light forming the images approximate a continuous divergent wavefront and provide selectable accommodation cues for the user, depending on the amount of parallax disparity between the intra-pupil images. The images may be formed by an emissive micro-display. Each pixel formed by the micro-display may be formed by one of a group of light emitters, which are at different locations such that the emitted light takes different paths to the eye to provide different amounts of parallax disparity.
1 . A method for displaying virtual image content using a head-mounted display system, the method performed by one or more processors of the display system, the method comprising:
determining light emitters of each of an array of groups of light emitters to activate based upon a level of parallax disparity associated with images formed by the light emitters, the array of groups of light emitters included in a micro-display of the display system;
activating a first light emitter of the groups of light emitters to form a first parallactically-disparate intra-pupil image;
activating a second light emitter of the groups of light emitters to form a second parallactically-disparate intra-pupil image; and
displaying a virtual object to appear to be on a depth plane by injecting image light including the first and second parallactically-disparate intra-pupil images of the object into a same eye of a viewer,
wherein the first and second parallactically-disparate intra-pupil images provide different views of the virtual object for a same eye of a user of the display system, and
wherein activating the first light emitter of the groups of light emitters overlaps in time with activating the second light emitter of the groups of light emitters, to inject the first and second parallactically-disparate intra-pupil images into the same eye of the user within a flicker fusion threshold that is 1/60 of a second.
2 . The method of claim 1 , wherein the first and second parallactically-disparate intra-pupil images are injected into the same eye of the user simultaneously.
3 . The method of claim 1 , wherein the display system further comprises an array of light collimators overlying the light emitters, wherein each light collimator is associated with one of the groups of light emitters and extends across all light emitters of the associated group of light emitters.
4 . The method of claim 3 , wherein the light collimators are lenslets.
5 . The method of claim 3 , wherein the light collimators are lenticular lenslets configured to provide different beams of light, from light emitters of an associated group of light emitters, to different locations along a first axis.
6 . The method of claim 1 , wherein the display system further comprises an array of selectively-activated shutters for selectively transmitting the image light to the eye from different locations.
7 . The method of claim 6 , wherein the array of selectively-activated shutters is disposed within an eye-box volume of the display system.
8 . The method of claim 6 , wherein the display system further comprises a pupil relay combiner eyepiece configured to relay the image light to the eye of the user, wherein the array of selectively-activated shutters are configured to regulate propagation of the image light to the pupil relay combiner eyepiece.
9 . The method of claim 8 , wherein the pupil relay combiner eyepiece comprises a plurality of waveguides, each waveguide comprising in-coupling optical elements and out-coupling optical elements.
10 . The method of claim 6 , wherein the shutters comprise chemical species having reversibly changeable states, the states providing different amounts of light transmission.
11 . The method of claim 6 , wherein the shutters comprise shutters comprise selectively-movable physical structures.
12 . The method of claim 1 , further comprising:
determining a gaze of the eye using an eye tracking sensor of the display system; and
selecting image content for the intra-pupil images based upon the determined gaze of the eye.
13 . The method of claim 1 , wherein the first and second parallactically-disparate intra-pupil images are injected into the eye at different angles.