System and method for presenting image content on multiple depth planes by providing multiple intra-pupil parallax views
An augmented reality 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. In the aggregate, 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 amount of parallax disparity is selected using a light source that outputs light for different images from different locations, with spatial differences in the locations of the light output providing differences in the paths that the light takes to the eye, which in turn provide different amounts of parallax disparity. Advantageously, the wavefront divergence, and the accommodation cue provided to the eye of the user, may be varied by appropriate selection of parallax disparity, which may be set by selecting the amount of spatial separation between the locations of light output.
1 . A head-mountable display system comprising:
a light source configured to emit light from different output locations;
a spatial light modulator configured to receive the light emitted by the light source and to modulate the received light to form virtual content, wherein the light that is emitted by the light source from at least two of the different output locations is received and modulated simultaneously at different respective areas of the spatial light modulator to form images of the virtual content, and wherein the light that is emitted from the at least two different output locations of the light source and that is received at the different respective areas of the spatial light modulator has a same polarization state; and
projection optics configured to direct the modulated light from the spatial light modulator toward an eye of a wearer of the head-mountable display system to inject the images of the virtual content into the eye,
wherein the display system is configured to display the virtual content on a depth plane by simultaneously injecting, into the eye, a set of images of the virtual content that are output simultaneously from the different respective areas of the spatial light modulator that have a lateral separation.
2 . The display system of claim 1 , wherein the light source includes at least two light emitters that emit light of different colors.
3 . The display system of claim 1 , wherein the light source comprises a plurality of selectively-activated light-emitting regions that respectively include the different output locations, wherein each of the light-emitting regions comprises at least one light emitter, and wherein the light from the different light-emitting regions of the light source is received and modulated by the different areas of the spatial light modulator.
4 . The display system of claim 3 , wherein at least two of the light-emitting regions overlap on the light source.
5 . The display system of claim 3 , wherein the light-emitting regions are distinctly arranged on the light source without overlapping.
6 . The display system of claim 3 , wherein the at least one light emitter includes at least one light emitting diode.
7 . The display system of claim 3 , wherein at least one of the light-emitting regions is substantially rectangular in shape or substantially circular in shape.
8 . The display system of claim 3 , wherein at least two of the light-emitting regions are configured to emit light of different luminance.
9 . The display system of claim 3 , wherein one or more of the light emitters is configured to emit light of selectively variable intensity.
10 . The display system of claim 3 , wherein the light from different light-emitting regions of the light source is output at different angles from the spatial light modulator.
11 . The display system of claim 3 , further comprising a controller that is programmed to vary a size of at least one of the light-emitting regions.
12 . The display system of claim 1 , further comprising a lens structure between the light source and the spatial light modulator.
13 . The display system of claim 12 , wherein the lens structure is configured to convert spatial differences in the light emitted from the light source to angular differences in propagation of the light to the spatial light modulator.
14 . The display system of claim 1 , further comprising a polarizing beam splitter arranged to direct at least a portion of the light from the light source toward the spatial light modulator.
15 . The display system of claim 1 , wherein the spatial light modulator includes one or more of a liquid crystal on silicon panel, a transmissive liquid crystal panel, a digital light processing device, or a MEMs device.
16 . The display system of claim 1 , wherein the projection optics is further configured to collimate the light that is output at different angles from the spatial light modulator.
17 . The display system of claim 1 , further comprising a lenslet array between the spatial light modulator and the projection optics, wherein the lenslet array is configured to direct the light that is output from the different areas of the spatial light modulator at different angles to the projection optics.
18 . The display system of claim 1 , further comprising a prism between the spatial light modulator and the projection optics, wherein the prism is configured to direct the light that is output from the different areas of the spatial light modulator at different angles to the projection optics.
19 . The display system of claim 1 , wherein at least two of the different areas of the spatial light modulator are interleaved such that the at least two different areas share at least one pixel.