Yes, there are light sensors on the Sharp TVs. They are currently shipped with the Optical Light Control (OLC) turned on, and Power Saver Mode turned on. Power Saver automatically turns the light sensors on, as well. To fix, simply press the Menu button, find Power Saver (use the + button to advance), and turn it off. Also, look for the OLC page and make sure it is off. After this, your screen will be bright, sharp, and the little green things on screen will go away. I really like the Sharp TVs. The new 2013 models have bigger built-in amplifier that is 20 Watts.