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Wide angle and high resolution tiled head-mounted display device

  • US 9,244,277 B2
  • Filed: 04/30/2010
  • Issued: 01/26/2016
  • Est. Priority Date: 04/30/2010
  • Status: Active Grant
First Claim
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1. A tiled head-mounted display device, comprising:

  • an optical component including a plurality of prisms with free-form surfaces, each prism being a wedge prism comprising a first optical surface, a second optical surface and a third optical surface; and

    a display component including a plurality of micro-displays, wherein the number of the micro-displays and the number of the prisms with free-form surfaces is identical,wherein each prism with free-form surfaces and the corresponding micro-display constitutes a display channel, a coordinate system is defined as;

    global coordinate origin O is exit pupil center;

    Z-axis is in a direction along the viewing axis of user'"'"'s eye;

    Y-axis is perpendicular to Z-axis and extends right above the eye;

    X-axis is perpendicular to both Y-axis and Z-axis, constituting a Cartesian coordinate;

    wherein the display channels are tiled so that an overall field of view of the tiled device can be substantially a summation of individual field of view of each display channel and the center of exit pupil of each display channel in the tiled device is located at a pupil center of the user'"'"'s eye,wherein the display channels are tiled by optical tiling methods, the first optical surface (2), the second optical surface (3) and the third optical surface (4) of each prism (102) satisfy following conditions (1)-(3);


    18≦

    ZPd

    28 



    (1)
    1.5≦

    ZPd′



    Z
    Pd

    3 



    (2)
    ZPc

    the eye clearance distance, i.e., 15 



    (3)where Pc is an intersection point of Ru with the first optical surface (2) upon total reflection, Pd is an intersection point of chief ray Rc in horizontal field of view with the first optical surface (2), Pd is an intersection point of Rc with the second optical surface (3),wherein optical tiling methods comprise a first optical tiling method and a second optical tiling method,wherein in the first optical tiling method, the bottom surfaces (11) of both prisms to be tiled are directly cemented together, the bottom surface (11) of each prism is positioned between the first optical surface (2) and the second optical surface (3);

    wherein in the second optical tiling method, the side surfaces (22, 23) of the respective prisms are directly cemented, the side surface of each prism intersects with the first optical surface (2), the second optical surface (3) and a third optical surface of the prism (4).

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