The company, Japan Display, have a crazy 17.3" IPS, 8K screen (513 ppi) which should run at an impressive 120Hz. Now we just have to find an equally crazy setup that could do anything close to 8K 120Hz.
http://www.eteknix.com/japan-display-conveys-prototype-8k-screen-within-17-inch-lcd/
Didn't scroll down enough to see GoodBytes already posted this, sorry.