US 10,473,939 B1Granted

Waveguide display with holographic Bragg grating

AssigneeFacebook Technologies, LLC

InventorsHee Yoon Lee, Wanli Chi, Pasi Saarikko

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Abstract

A near-eye display includes a light source assembly, a first waveguide, an output waveguide, and a controller. The light source assembly emits image light including light within a first band and a second band. The first waveguide receives the image light, expands the received image light in at least one dimension, and outputs an image light. The output waveguide includes an output area and a plurality of input areas. Each input area receives the image light from the first waveguide. The output waveguide includes a holographic Bragg grating and the output waveguide expands the image light at least along two dimensions to form an expanded image light, and outputs the expanded image light toward an eyebox. The controller controls the scanning of the light source assembly and the first waveguide.

Claims25

Dependent claims

A waveguide, comprising:

a waveguide body including:
a top surface,
a bottom surface that is opposite to the top surface,
one or more input surfaces, and
a holographic Bragg grating;
a plurality of input areas located along the one or more input surfaces, each of the plurality of input areas configured to receive an image light from a light source assembly, the received image light including a light within a first band and a light within a second band different from the first band;
and
an output area located along the bottom surface,
wherein the holographic Bragg grating is configured to output an outgoing image light based on the image light toward an eyebox,
wherein the holographic Bragg grating is configured to diffract light in the first band and light in the second band incident over a first range of angles to a second range of angles, and
wherein the holographic Bragg grating is configured to diffract the light in the first band and the light in the second band incident over a given angle in the first range to different angles of the second range.

8 more elements

A near-eye display, comprising:

a light source assembly configured to emit image light that is at least partially coherent, and the image light including light within a first band and a light within a second band that is different from the first band;
a first waveguide including an entrance area and an exit area, the first waveguide configured to receive the image light from the light source assembly at the entrance area, expand the image light in at least a first dimension, and output a first expanded image light from the exit area;
an output waveguide including a holographic Bragg grating, an output area along a first plane, and a plurality of input areas along a second plane different from the first plane, each of the plurality of input areas configured to receive the expanded image light from the first waveguide, the output waveguide configured to expand the first image light at least along the second dimension to form a second expanded image light, and the holographic Bragg grating configured to output the second expanded image light toward an eyebox;
and
a controller configured to generate the display instructions and provide the display instructions to the light source assembly,
wherein the holographic Bragg grating includes a plurality of exposures and diffracts the image light incident at a first angle to a second angle that is the same for light in the first band and light in the second band.

3 more elements

Dependencies are inferred from the claim text.