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Adjusting an electronic display based on gaze tracking

  • US 10,514,756 B2
  • Filed: 05/05/2017
  • Issued: 12/24/2019
  • Est. Priority Date: 05/06/2016
  • Status: Active Grant
First Claim
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1. A system for adjusting an electronic display, comprising:

  • a gaze tracking device operable to capture an image of a pupil associated with a viewer of the electronic display, wherein the gaze tracking device is operable to determine a diameter of the pupil from the image of the pupil, and communicate a signal indicating the diameter of the pupil to a microcontroller;

    a logarithmic ambient light sensor operable to detect ambient light around the electronic display and communicate a logarithmic signal to the microcontroller indicating the detected ambient light around the electronic display;

    a logarithmic forward looking light sensor operable to detect light viewed by the viewer of the electronic display and communicate a logarithmic signal to the microcontroller indicating the detected light viewed by the viewer; and

    wherein the microcontroller is operable to;

    adjust a luminance of the electronic display based on a combination of the diameter of the pupil of the viewer, a detected change in a pupil size, the logarithmic signal from the logarithmic ambient light sensor indicating the detected ambient light around the electronic display, and the logarithmic signal from the logarithmic forward looking light sensor indicating the detected light viewed by the viewer;

    initialize a slope to zero;

    determine if the viewer is oriented at the gaze tracking device, and in response to this;

    introduce a pupil latency delay;

    measure the diameter of the pupil and record a time stamp of the measurement;

    determine if the pupil is still gazing at the gaze tracking device, and in response to this determination being yes, and in response to a predetermined time elapsing, re-measure the diameter of the pupil;

    based on an original diameter of the pupil, the re-measured diameter of the pupil, and a change in time, calculating the slope, an acceleration, a time constant and a steady state pupil diameter value;

    re-calculate a relationship with the re-measured diameter of the pupil;

    determine whether the time constant calculated is correct;

    ascertain a luminance step based on the steady state pupil diameter value; and

    determine a final luminance based on the luminance step.

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