[tnel]

They literally did this 7 years ago with the Motorola Z series and the insta share projector mod. You can get the phone and the projector real cheap used. Pair it with some SoundCore minis paired together and you have yourself a portable movie theater.

[numpad0]

There are also Xperia Touch(G1109) and numerous other AliExpress projectors with Android device integrated. The idea is potentially valid but IME the lamp tech available are just too dim.

[Turskarama]

That is a micro projector that attaches to the phone, less of a mod and more of a specialised piece of hardware.

It was also 50 lumens where a typical home theatre projector is more like 2000 lumens.

There's a reason most people own a tv and almost nobody owns a micro projector, they're not very good.