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Headup display device and method for indicating virtual image

  • US 20110102483A1
  • Filed: 11/03/2010
  • Published: 05/05/2011
  • Est. Priority Date: 11/05/2009
  • Status: Active Grant
First Claim
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1. A headup display device configured to control a brightness of an image according to a present illumination in an environment of a vehicle and project the image to a front windshield of the vehicle to indicate the image as a virtual image in an interior of the vehicle, the headup display device comprising:

  • an illumination determination unit configured to;

    determine the present illumination by multiplying an increasing rate by an interior illumination, which is an illumination in the interior of the vehicle, in a light-adapted state, in which an interior of the vehicle is lighter than an exterior of the vehicle; and

    determine the present illumination by multiplying a decreasing rate by an exterior illumination, which is an illumination in the exterior of the vehicle, in a dark-adapted state, in which an interior of the vehicle is darker than the exterior of the vehicle; and

    a brightness control unit configured to control the brightness at a brightness corresponding to the present illumination determined by the illumination determination unit.

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