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Display instrument and image display method

  • US 9,972,135 B2
  • Filed: 11/16/2016
  • Issued: 05/15/2018
  • Est. Priority Date: 05/09/2012
  • Status: Active Grant
First Claim
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1. A head-mounted display device comprising:

  • an image sensor configured to capture an image of a portion of an environment viewable through the head-mounted display device;

    a display configured to display an image captured by the image sensor of the portion of the environment viewable through the head-mounted display device, the display comprising at least one diffraction grating member comprising a plurality of laminated diffraction grating layers each causing diffractive reflection of light beams of a different wavelength band;

    a light shutter configured to allow an amount of ambient light from the environment to pass through the light shutter when the head-mounted display is configured in a first mode of operation, and to decrease the amount of ambient light from the environment allowed to pass through the light shutter when the head-mounted display device is configured in a second mode of operation; and

    a control circuit configured to;

    selectively place the head-mounted display in either of the first mode of operation or the second mode of operation,process the image captured by the image sensor to extract feature points therefrom and to compare the extracted feature points with information identifying feature points of various objects to determine whether the extracted feature points conform to the feature points identified by the information, andin response to determining that the extracted feature points conform to the feature points identified by the information, cause the light shutter to decrease the amount of ambient light that is allowed to pass the light shutter and cause the display to present display data together with the captured image.

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