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Adaptive brightness control of head mounted display

  • US 9,087,471 B2
  • Filed: 11/04/2011
  • Issued: 07/21/2015
  • Est. Priority Date: 11/04/2011
  • Status: Active Grant
First Claim
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1. A method for adaptive brightness control of an eyepiece of a head mounted display (“

  • HMD”

    ), the method comprising;

    displaying a computer generated image (“

    CGI”

    ) from a see-through viewing region of the eyepiece of the HMD;

    capturing image data from an ambient environment surrounding the HMD;

    calculating a brightness value for the ambient environment based at least in part upon the image data;

    determining a bias power setting to apply to an illumination source for generating the CGI based at least in part upon the brightness value;

    controlling a brightness level of the CGI with the bias power setting that is based at least in part upon the brightness value;

    adjusting a transparency of a variable transparency layer disposed over the see-through viewing region based at least in part upon the brightness value; and

    passing ambient scene light through an ambient scene side and an eye-ward side of the eyepiece in the see-through viewing region to an eye of a user,wherein the variable transparency layer is positioned to affect a brightness of the ambient scene light without affecting a brightness of the CGI emitted to the eye,wherein the transparency of the variable transparency layer is reduced prior to increasing the brightness level of the CGI.

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