Back in 2012/2013 these big screen android tablets were sold by a number of companies.
They often were marketed as AIO (All In One) devices and were sold new for € 300 - € 500 depending on brand/model. As far as I known none of them had a battery, so they allways needed to be connected to the mains.
They did not sell very well though, so they were not on the market for very long. And I remember there were quite a lot of them available on the second hand market from 2014 on...
I currently own two
An Acer DA220HQL (which also doubles as a pc monitor as it has a hdmi in port)
https://www.youtube.com/watch?v=8Rjrq6-xcH8And a HP Slate 21 (visible in my avatar)
https://www.youtube.com/watch?v=wcU_ZVZY7nAThey both were a bit slow compared to other (normal sized) tablets at the time they were introduced, so they are even slower nowadays
.
And the Android versions they run are a bit old, so not all apps can be updated to recent versions
But for displaying music scores they are indeed still great.
I run a copy of the Mobilesheets Pro app on both of them for handling my scores.
And through the use of an usb cable between each tablet and my Genos or my PSR SX900 I am able to load the corresponding registration on the keyboard automatically when loading a score in Mobilesheets Pro, or vice versa, displaying scores automatically on the tablets by loading the corresponding registration files on my keyboards.
Just great!
With some patience it may still be possible to get one of those big android tablets cheaply on the second hand market. I sometimes still see a HP slate 21 appear where I live ...
Rudy