Nexus 7 will sport a 7-inch screen, though it's unknown whether it will be made of Gorilla Glass like the iPad. Its LCD will be of the (relatively costly) IPS variety, giving it an enormous color palette and a wide viewing angle of 178 degrees. However, it will apparently operate at 1280 x 800 pixels, which by today's standards seems downright Spartan. Google confirmed this report, and that's a disappointment. Because with a GeForce GPU that can pump out 2560 x 1600 pixels, it seems crazy to hobble it with such a limited display. At a resolution of 1280 x 800, the Nexus 7's pixel density of 215 pixels per inch.
Conversely, the iPad 3 boasts a much greater density of 264 PPI. With the release of the Retina display in the iPhone 4 last year, Apple described its pixel density as being akin to the human retina. The 9.7-inch Retina display in the iPad 3 offers 2048 x 1536, double that of iPad 2 and significantly greater than that of the monitor you're looking at right now.