AUGMENTED AND VIRTUAL REALITY DISPLAY SYSTEMS WITH CORRELATED IN-COUPLING AND OUT-COUPLING OPTICAL REGIONS FOR EFFICIENT LIGHT UTILIZATION
Augmented reality and virtual reality display systems and devices are configured for efficient use of projected light. In some aspects, a display system includes a light projection system and a head-mounted display configured to project light into an eye of the user to display virtual image content. The head-mounted display includes at least one waveguide comprising a plurality of in-coupling elements each configured to receive, from the light projection system, light corresponding to a portion of the user's field of view and to in-couple the light into the waveguide; and a plurality of out-coupling elements configured to out-couple the light out of the waveguide to display the virtual content, wherein each of the out-coupling elements are configured to receive light from different ones of the in-coupling elements.
1 . A waveguide comprising:
a plurality of in-coupling elements configured to receive light and to in-couple the light into the waveguide such that that in-coupled light is conveyed within the waveguide via total internal reflection; and
an out-coupling element configured to out-couple, from the waveguide, the light that is being conveyed within the waveguide, the out-coupling element including a plurality of out-coupling regions that are each configured to receive and out-couple a portion of the light that is in-coupled into the waveguide by an associated one or more of the in-coupling elements.
2 . The waveguide of claim 1 , wherein the plurality of in-coupling elements are arranged proximate to at least one lateral edge of the waveguide.
3 . The waveguide of claim 1 , wherein at least two of the out-coupling regions of separated from each other by at least one physical structure.
4 . The waveguide of claim 1 , wherein at least one of the plurality of in-coupling elements is arranged on a same surface of the waveguide as the out-coupling element.
5 . The waveguide of claim 1 , wherein at least one of the plurality of in-coupling elements is arranged on an opposite surface of the waveguide as the out-coupling element.
6 . The waveguide of claim 1 , wherein the plurality of in-coupling elements are arranged in a row on the waveguide, and wherein each of the out-coupling regions is configured as a stripe that is elongated along an axis that crosses the row.
7 . The waveguide of claim 1 , wherein each of the out-coupling regions is configured to receive and out-couple a portion of the light that is in-coupled into the waveguide by particular one of the in-coupling elements.
8 . The waveguide of claim 1 , wherein at least two of the plurality of in-coupling elements are disposed along different lateral edges of out-coupling element.
9 . The waveguide of claim 1 , wherein the plurality of in-coupling elements substantially encircle the out-coupling element.
10 . The waveguide of claim 1 , wherein the out-coupling regions are arranged in a grid pattern on the waveguide.
11 . The waveguide of claim 1 , wherein the plurality of in-coupling elements comprise diffractive gratings.
12 . The waveguide of claim 11 , wherein each of the in-coupling elements has a different grating pitch than at least one other of the in-coupling elements.
13 . The waveguide of claim 11 , wherein each of the in-coupling elements has a different grating orientation, within a plane of a major surface of the waveguide, than at least one other of the in-coupling elements.
14 . The waveguide of claim 11 , wherein each of the in-coupling elements has a different tilt, relative to a plane of a major surface of the waveguide, than at least one other of the in-coupling elements.
15 . The waveguide of claim 1 , wherein each of the in-coupling elements is arranged to in-couple light and to direct that light to propagate by total internal reflection along a different direction, within the waveguide, than at least one other of the in-coupling elements.
16 . The waveguide of claim 1 , wherein the in-coupling elements are spaced apart from one another.
17 . A display system comprising:
a light projection system; and
a head-mountable display configured to display the virtual image content, the head-mountable display including the waveguide of claim 1 .
18 . The display system of claim 17 , wherein the waveguide is one of a stack of waveguides included in the head-mountable display.
19 . The display system of claim 18 , wherein different ones of the stack of waveguides are configured to output light with different amounts of wavefront divergence corresponding to different depth planes.
20 . The display system of claim 18 , wherein different ones of the stack of waveguides are configured to receive, convey, and output light of different wavelength ranges corresponding to different colors.