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LIGHT PROJECTING METHOD AND DEVICE

  • US 20200132928A1
  • Filed: 10/24/2018
  • Published: 04/30/2020
  • Est. Priority Date: 10/24/2018
  • Status: Active Grant
First Claim
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1. A light projecting system, comprising:

  • a waveguide comprising a first surface, a second surface, and a fourth surface, at least one of the first surface or the second surface comprising a first plurality of grating structures;

    a light source coupling light into the waveguide to form an in-coupled light beam, wherein;

    the waveguide is configured to guide the in-coupled light beam to undergo total internal reflection between the first surface and the second surface until reaching the fourth surface, andeach of the first grating structures is configured to disrupt the total internal reflection to cause at least a portion of the in-coupled light beam to couple out of the waveguide, the portion of the in-coupled light beam coupled out of the waveguide being an out-coupled light beam, and a remainder beam of the in-coupled light beam undergoing the total internal reflection being coupled out of the waveguide from the fourth surface after the out-coupling at each of the first grating structures; and

    a detector configured to receive and measure the remainder beam, wherein the light source or a light blocker at least decreases the strength of the in-coupled light beam in response to the remainder beam exceeding a threshold.

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