Ambient light calibration for energy efficiency in display systems

摘要

A method, system, and apparatus that can be used to operate a display device in an energy efficient manner. The energy efficient display device can effectively and efficiently compensate for changes in ambient light incident at a display screen of the display device using an internal ambient light sensor to provide control signals to a backlight driver.

主权项

1. A method, comprising:
receiving an indication of a target luminance level using a calibration light sensor configured to determine the target luminance level from a calibrated light source; receiving calibrated light at a first part of an optical path at the target luminance level, wherein the optical path comprises a plurality of elements each of which cause an associated variance from the target luminance level of the light provided by the calibrated light source; detecting light received at the first part of the optical path using a light detector at a second part of the optical path at a second luminance level; and calculating a calibration factor based upon the relationship between the target luminance level and the second luminance level, wherein the calibration factor is configured to be used by a system processor in a display system to modify a control signal sent to a backlight driver unit, wherein the display signal causes the backlight driver unit to output an amount of light in accordance with ambient light detected by a light sensor.