Automatic 16:9 21:9 2.37:1 2.39:1 2.40:1 DCI 4K 32:9 Although pretty much all modern TVs are 16:9, having different aspect ratio options is important for users who connect their Apple TV to ...

As noted by Sigmund Judge, the update includes a new option that lets the Apple TV automatically detect the best aspect ratio for a television or projector. Options include 16:9, 21:9, 2.37:1, 2. ...