Surface has a 10.6-inch display, larger than the iPad's 9.7-inch screen. Surface also has a different aspect ratio, meaning its shape is a longer, thinner rectangle at 16:9 than the iPad's at 4:3. 16:9 is a familiar shape; it's the ratio used on HD TVs. Microsoft says the display is either HD or full HD depending on model, but it doesn't define what that means. The minimum resolution Windows 8 requires is 1024x768 pixels. The new iPad's Retina display features 265 pixels per inch; Windows 8 supports 291 ppi on a 10.1-inch tablet, making the density for Surface potentially in the same ballpark.