It's called spacedesk, and with it, I was able to quickly and easily use my tablet or my smartphone as a second monitor for my PC. Pretty much any modern Android tablet or smartphone will work for ...
to connect to that monitor. This script is example of Nexus 7 2013 as second monitor.You may need to change 1920 and 1200 to the resolution of your tablet screen. You may also need to change LVDS1 if ...
The program will also start the x0vncserver command. Press Ctrl+C to terminate the vnc server and turn off the virtual monitor. Start a vnc client on your android tablet - e.g. the android app bVBC - ...
If, on the other hand, you want an Android tablet to become the second monitor of a Windows computer you can use the SuperDisplay app. The app can be bought for a one-off price of around €17/$17 ...