Large size android tab or hybrid 14" or more

A

AC Question

I need a tablet or contertible laptop that can lay flat,
To put a music stand in a vertical position to slightly enlarge
A reg 8 x11 sheet of music during performance , the samsung galaxy 12.2 is not big enough. I need the actual display screen to be at least 12" high by 9" wide in this position , maybe slightly larger as i have sight issues and want to see the full score not half pages, by a
120%enlargement ratio I heard there is a galaxy 18" coming out.?
i need high resolution for the music and enough memory or a sim card input to access a thousands of pages
Otherwise is there a way to take a smaller android screen have connect it to to an external monitor like google chrome does, that
Will mirror the image , most monitors dont allow both portrait and landscape, so when i turn the android, the imge on,the monitor needs to mirror it. Any ideas would be appreciated. Thank you ray b