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Sharp has started manufacturing 5 inch displays with 443 pixels per inch. If you don’t feel like doing the math, that means they have 1920 x 1080 pixel displays — or about the same resolution as you’d expect from a decent 40 inch high definition TV.

The difference is that an HDTV is designed to be viewed from a couch, about 6 to 8 feet away. A phone is meant to be held about a foot away from your eyes. So the more pixels per inch you can pack into a smartphone screen, the sharper text and images will look, and the harder it will be to pick out individual pixels.

At this rate, you’ll probably have a hard time picking out pixel-sized Waldo while holding a screen an inch or two from your face.

Sharp says full scale production of its new screens begins this month. There’s no word on what phones they’ll end up in.

This isn’t the first time we’ve heard about 5 inch, 1080p smartphone screens. Chinese device maker Oppo recently unveiled the Find5 X990, the first smartphone with a 1920 x 1080 pixel display that measures 5 inches diagonally.