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Display with integrated visible light eye tracking

  • US 10,073,268 B2
  • Filed: 11/09/2017
  • Issued: 09/11/2018
  • Est. Priority Date: 05/28/2015
  • Status: Active Grant
First Claim
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1. A wearable heads-up display (“

  • WHUD”

    ) comprising;

    a support frame that in use is worn on a head of a user;

    a laser module carried by the support frame, the laser module including a first laser diode to output a first visible laser light in a first narrow waveband, the first visible laser light representative of at least a first portion of a displayed image, and a second laser diode to output a second visible laser light in a second narrow waveband, the second narrow waveband different from the first narrow waveband, wherein the second visible laser light is representative of at least a second portion of the displayed image;

    a scan mirror carried by the support frame and aligned with an output of the laser module to receive the first visible laser light and the second visible laser light and to controllably reflect the first visible laser light and the second visible laser light;

    a wavelength-multiplexed holographic optical element (“

    HOE”

    ) carried by the support frame and positioned within a field of view of and in opposing relation to at least one eye of the user when the support frame is worn on the head of the user, the HOE aligned to receive the first visible laser light and the second visible laser light reflected from the scan mirror and to redirect the first visible laser light and the second visible laser light towards the at least one eye of the user when the support frame is worn on the head of the user, wherein the HOE includes a first hologram that is responsive to the first visible laser light in the first narrow waveband and unresponsive to the second visible laser light in the second narrow waveband and a second hologram that is responsive to the second visible laser light in the second narrow waveband and unresponsive to the first visible laser light in the first narrow waveband, and wherein the HOE is substantially transparent to environmental light; and

    a first narrow waveband photodetector carried by the support frame and aligned to receive at least a portion of the first visible laser light that is reflected from the at least one eye of the user when the support frame is worn on the head of the user, wherein the first narrow waveband photodetector is responsive to the first visible laser light in the first narrow waveband and unresponsive to light that is outside of the first narrow waveband, wherein the first narrow waveband photodetector is positioned proximate the HOE and aligned such that the first narrow waveband photodetector directly receives the at least a portion of the first visible laser light that is reflected from the at least one eye of the user; and

    a second narrow waveband photodetector carried by the support frame and aligned to receive at least a portion of the second visible laser light that is reflected from the at least one eye of the user when the support frame is worn on the head of the user, wherein the second narrow waveband photodetector is responsive to the second visible laser light in the second narrow waveband and unresponsive to light that is outside of the second narrow waveband.

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