US Patent 7744216 Display system intensity adjustment based on pupil dilation

A method and/or system of adjusting light output intensity of a display system includes providing a display system that provides information to a user. Dilation of a pupil of the user is monitored (e.g., using an imaging device) and adjustment of the light output intensity of the display system is performed as a function of the monitored dilation of the pupil of the user. Yet further, for example, such adjustment of light output intensity may also be performed as a function of the monitored ambient light intensity in addition to the monitored dilation of the pupil of the user.