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Infrared sensing of eye and eyelid movements to detect drowsiness

  • US 9,489,817 B2
  • Filed: 01/29/2015
  • Issued: 11/08/2016
  • Est. Priority Date: 01/29/2015
  • Status: Active Grant
First Claim
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1. A head-mounted device, comprising:

  • a sensing apparatus, comprising;

    a first infrared emitter and a second infrared emitter positioned below the first infrared emitter, wherein the first and second infrared emitters are configured to alternate emission of infrared pulses at an eye of a user; and

    a first infrared detector configured to;

    produce, at a first time, a first measurement of a reflection of the infrared pulses transmitted from the first infrared emitter to the eye of the user; and

    produce, at a second time subsequent to the first time, a second measurement of the reflection of the infrared pulses transmitted from the second infrared emitter to the eye of the user; and

    a processing apparatus configured to analyze the first and second measurements from the first infrared detector to characterize an eyelid movement of the user.

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