What is the device with highest resolution?

I want to know what is the device cellphone, etc. With highest resolution in the screen. They said its the iphone with 326ppi. But now i saw another one with 360ppi. Can someone tell me what is the highest definition device in the world.

PPI is not resolution. That is pixels per inch. Things like 1280x720 are resolutions I think as of now the highest resolution are the new 4K HDTVs. Don't know what the resolution is off hand though.