Maybe in Settings | Audio & Video | Resolutions | try Auto or one of the other 1080 resolution options? Could there be a video setting in the TV that needs to be adjusted from 4:3 to 16:9? My after market Pioneer units in both my cars utilise the full screen when playing video from my iPhone 5s with no setting adjustments required. These Pioneer systems have Mirror Link software which is designed to be compatible with Apple iPhones via the Apple VGA to Lightning adapter. You could try watching the Netflix App from your iPhone plugged in. Like Mazda cars I'm not sure Jeep is one of the few car brands that has Apple's Car Play technology at this time. According to the Owner of the company that installs my car information systems, Alpine have some very exciting prototypes they are working on. See what your car entertainment specialist recommends. Let me know if you manage to have the Apple TV play in widescreen format and what you did as I like the concept and might consider that in my SUV.