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Multi-focal display system and method

  • US 10,386,636 B2
  • Filed: 01/30/2015
  • Issued: 08/20/2019
  • Est. Priority Date: 01/31/2014
  • Status: Active Grant
First Claim
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1. An augmented reality display system, comprising:

  • a light projection device operatively coupled to an image source for projecting a pair of consecutive image frames comprising first and second consecutive image frames for viewing by a user'"'"'s eyes through a display; and

    a composite variable focus element (VFE) system comprising;

    a first VFE and a second VFE arranged in series relative to the first VFE, whereinthe composite VFE is structured such thata total optical power of the composite VFE is a combination of a first optical power of the first VFE and a second optical power of the second VFEthe first VFE is configured to switch between two focus states to focus respective first and second consecutive image frames at respective first and second depth planes, the first VFE being configured to focus respective pairs of consecutive image frames to respective pairs of depth planes,a first distance between the first depth plane and the second depth plane is based at least in part upon a constant optical power difference comprising a difference between the first optical power of the first VFE and the second optical power of the second VFE, andthe second VFE is configured to further focus the first and second consecutive image frames to third and fourth depth planes, wherein a distance between the third depth plane and the fourth depth plane is based at least in part upon the constant optical power difference.

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