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Bifocal head-up display system

  • US 9,030,749 B2
  • Filed: 08/01/2012
  • Issued: 05/12/2015
  • Est. Priority Date: 08/01/2012
  • Status: Active Grant
First Claim
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1. A head-up display device to display an image in a vehicle operator'"'"'s field of view, the head-up display device having a bifocal projection apparatus to focus a first portion of the image at a first distance from the vehicle operator, and to focus a second portion of the image at a second distance further from the vehicle operator than the first distance, wherein the bifocal projection apparatus comprises a projector, relay optics, and a movable projection surface that occupies an intermediate image plane between the projector and the relay optics, and wherein the projection surface is operable to move through a calibrated distance faster than a refresh rate of the projector to enable imaging of the intermediate image plane at different virtual image planes through the relay optics.

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