US 12,578,249 B1Granted

Augmented reality waveguide and display light engine metrology

AssigneeAmazon Technologies, Inc.

InventorsErfan Fard, Shengtong Chen

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Abstract

Techniques for augmented reality waveguide and display light engine metrology are described. In an example, a computer system causes a display light engine to emit first light from a first group of pixels of the display light engine. The computer system determines a first measurement value associated with the first light after the first light is extracted from an optical waveguide. The computer system causes the display light engine to emit second light from a second group of pixels of the display light engine. The second group is different from the first group. The computer system determines a second measurement value associated with the second light after the second light is extracted from the optical waveguide. The computer system generates, based on the first measurement value and the second measurement value, a metrology measurement indicating a property of the optical waveguide.

Claims20

Dependent claims

A system comprising:

an optical power meter;
one or more processors;
and
one or more memory storing instructions that, upon execution by the one or more processors, cause the one or more processors to:
cause a display light engine to emit, at a first time, first light from a first group of pixels of the display light engine toward an injection holographic layer of an optical waveguide;
receive, from the optical power meter, a first power measurement value associated with the first light after the first light is extracted from an extraction holographic layer of the optical waveguide, wherein the first light propagates from the injection holographic layer to the extraction holographic layer;
cause the display light engine to emit, at a second time, second light from a second group of pixels of the display light engine toward the injection holographic layer, the second group being different from the first group, the first light and the second light having a same wavelength;
receive, from the optical power meter, a second power measurement value associated with the second light after the second light is extracted from the extraction holographic layer;
and
generate, based at least in part on the first power measurement value and the second power measurement value, a metrology measurement indicating a property of the optical waveguide, the property including at least one of a uniformity of light extraction from the optical waveguide or an alignment of the optical waveguide and the display light engine.

7 more elements

A method comprising:

causing a display light engine to emit first light from a first group of pixels of the display light engine, the display light engine optically coupled to an injection holographic layer of an optical waveguide;
determining a first measurement value associated with the first light after the first light is extracted from the optical waveguide, the first measurement value determined by at least being received from an optical power meter that is optically coupled to an extraction holographic layer of the optical waveguide;
causing the display light engine to emit second light from a second group of pixels of the display light engine, the second group being different from the first group;
determining a second measurement value associated with the second light after the second light is extracted from the optical waveguide;
and
generating, based at least in part on the first measurement value and the second measurement value, a metrology measurement indicating a property of the optical waveguide.

3 more elements

A system comprising:

one or more processors;
and
one or more memory storing instructions that, upon execution by the one or more processors, cause the one or more processors to:
cause a display light engine to emit, at a first time, first light from a first group of pixels of the display light engine, the first light having a first wavelength;
determine a first measurement value associated with the first light after the first light is extracted from an optical waveguide;
cause the display light engine to emit, at the first time, second light from a second group of pixels of the display light engine, the second group being different from the first group, the second light having a second wavelength different from the first wavelength;
determine a second measurement value associated with the second light after the second light is extracted from the optical waveguide;
and
generate, based at least in part on the first measurement value and the second measurement value, a metrology measurement indicating a property of the optical waveguide.

6 more elements

Dependencies are inferred from the claim text.