The iPad could use some more pixels, if you're to close text will look pixellated.
But the pixel density is still higher than a high-res 15" MBP. To get to the iPhone 4 ppi you would need to have a display with more pixels than a 27" iMac which would make it far to expensive.
But the pixel density is still higher than a high-res 15" MBP. To get to the iPhone 4 ppi you would need to have a display with more pixels than a 27" iMac which would make it far to expensive.