I am trying to solve something here.
I am trying to figure out a way to control an android device with an external touchscreen display. The android device would either be a Samsung Galaxy Tab A or a Galaxy Alpha. I have seen many connectors that allow you to display the screen from a tablet onto a tv or monitor but no easy way on controlling it using the larger screen (probably due to the video output on the tablet not supporting touch signals?). I have seen a few threads on various blogs that can just about manage this but they seem to be out of date and I can't see why this isn't easier.
Ideally, the external monitor needs to be larger than 20 inches and be a capacitive touch screen rather than a resistive type. I am using this as a control surface for music production and performance and sadly, the screen size on available tablets isn't big enough.
I would really appreciate any kind of input. I hope I'm not being a complete idiot and that this is really easy to do. Please let me know either way. Thanks
*Edit: Ideally, I would like to be able to use the tablet without the external screen as normal when I want. The extra screen size would be an added, optional extra.