Resizing/Cutting LCD
I find out how they made it already. It is very difficult patented industrial process. They are able cut the lcd from top or from one side according LCD matrix. The cutting should be in vacuum environment and with laser. Then they use a special tech to reseal it. 

I think you dont even have to configure LCD driver because if you increase the blankings it should work out of the box with existing driver. Anyway it is almost impossible to do by a simple diy person.