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Head-mounted display device

  • US 10,168,454 B2
  • Filed: 03/10/2015
  • Issued: 01/01/2019
  • Est. Priority Date: 03/10/2014
  • Status: Active Grant
First Claim
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1. A head-mounted display comprising:

  • a display element;

    a light guide prism extending in a longitudinal direction, the light guide prism having an optical axis along the longitudinal direction and having four side surfaces each having a substantially rectangular section taken perpendicular to the optical axis, the light guide prism including an incident surface through which image light from the display element enters the light guide prism, the light guide prism guiding the entered image light along the optical axis in the longitudinal direction to an eye of a user and emitting the guided image light from an emission surface to the eye of the user;

    a housing that contains the display element and the light guide prism; and

    a support unit that fixes the housing to a head of the user,wherein;

    the light guide prism is partially covered by and contained in the housing on an end of the light guide prism closer to the incident surface such that a portion of at least one of the four side surfaces of the light guide prism that is covered by the housing being formed with a first groove open to the at least one of the four side surfaces, and a portion of the at least one of the four side surfaces of the light guide prism on an end of the light guide prism closer to the emission surface that is exposed outside the housing being formed with a second groove open to the at least one of the four side surfaces,a depth of the first groove measured from the at least one of the four side surfaces is greater than a depth of the second groove measured from the at least one of the four side surfaces;

    each of the first groove and the second groove is defined by two tilted surfaces and has a V-shaped sectional form; and

    one of the two tilted surfaces defining the first groove that is located closer to the incident surface is formed at a tilt angle not satisfying a total reflection condition with respect to at least part of light beams constituting the image light, which directly enters the light guide prism from the display element through the incident surface, and one of the two tilted surfaces defining the second groove that is located closer to the incident surface is formed at a tilt angle satisfying the total reflection condition with respect to all of the light beams constituting the image light, which directly enters the light guide prism from the display element through the incident surface.

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