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US 11,960,094 B2Granted
Wearable heads-up display with optical path fault detection
AssigneeGoogle Inc.
InventorsStuart James Myron Nicholson, Timothy Paul Bodiya
Life of this patent
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Abstract
A wearable heads-up display includes a power source, laser sources, and a lightguide. A photodetector is positioned to detect an intensity of a test light emitted at a perimeter of the lightguide from an optical path within the lightguide. A laser safety circuit provides a control to reduce or shut off a supply of electrical power from the power source to the laser sources in response to an output signal from the photodetector indicating that the detected intensity is below a threshold.
Claims20
A wearable heads-up display, comprising:
- at least one photodetector positioned proximate a perimeter of a lightguide to detect a first intensity of a portion of a test light emitted within the wearable heads-up display;
- and
- a laser safety circuit coupled to the at least one photodetector, the laser safety circuit to reduce or shut off a supply of electrical power from a power source to a plurality of laser sources carried within the wearable heads-up display in response to the at least one photodetector indicating that the detected first intensity is below a first threshold.
A wearable heads-up display, comprising:
- a laser module including at least one laser source;
- a lightguide having at least one optical path defined therein;
- at least one light source to output a test light into the lightguide;
- a photodetector positioned proximate to a perimeter of the lightguide to detect an intensity of a portion of the test light emitted from within the lightguide;
- and
- a laser safety circuit coupled to a power source and the photodetector, the laser safety circuit to reduce or shut off a supply of electrical power from the power source to the laser module in response to an output signal from the photodetector indicating that the detected intensity is below a threshold.
3 more elements
A method comprising:
- testing a wearable heads-up display for optical path faults, the testing comprising:
- generating a test light;
- and
- detecting an intensity of a portion of the test light that is emitted at a perimeter of a lightguide;
- and
- in response to detecting that the intensity is below a threshold, reducing or shutting off a supply of electrical power from a power source to a plurality of laser sources.
3 more elements
Dependencies are inferred from the claim text.