How did you get yours to go full screen? when i installed Roku stick few months back on was not able to get a full screen. it will be 4:3 same with the chromecast and firestick. I only used it for fun a giggle and removed it. Its no use to me if i cant use it while in motion, NO not to watch movies but to cast my cellphone screen on it. Waze and stuffI played around with the HDMI input and my Chromecast device. Was able to cast with no problem. Cool little option to have. See pics.