Running the algorithms to translate the optical sensor info takes a good bit of computing power, however.

ENGADGET

In addition, the Optical Picture (OPC) feature helps save power by using a sensor on the front of the TV to detect ambient room light, and automatically adjusts TV brightness for the best picture.

ENGADGET: Sharp announces new 6-, 7- and 8-Series AQUOS LED TVs as part of 2013 lineup (update: pricing info)