LG Resolution Demo

At SID 2011, LG Display had an interesting demo in its booth—a series of flat panels of different sizes and resolutions to show how these two parameters are related. To maintain a given amount of detail as the screen size increases, so must the resolution, even as the number of pixels per inch decreases. The two largest screens have 4K resolution, while the two smallest are 720p (roughly 1K). I was unable to find out why they had such different color profiles.