Patent ID: 8242707

Claim:
A method, comprising: calibrating a light source to a target luminance value, the target luminance value corresponding to an ambient light condition; providing a calibrated light by the light source, the calibrated light having a luminance value within a range of the target luminance value; receiving the calibrated light at a first part of an optical path at the target luminance level, the optical path having a plurality of elements each of which cause an associated variance from the target luminance value of the light provided by the calibrated light source; detecting light received at the first part of the optical path by a light detector at a second part of the optical path at a second luminance level, the light detector included in a display system; and calculating a calibration factor based upon the relationship between the target luminance level and the second luminance level, the calibration factor used by a system processor in the display system to modify a control signal sent to a backlight driver unit, the display signal causing the backlight driver unit to output an amount of light in accordance with ambient light detected by the light sensor.