HP Pre3

Darren Murph at Engadget:

[…] the 3.6-inch WVGA touchpanel is the best display yet on a Pre. Colors pop from edge to edge, viewing angles are on par with any Super AMOLED Plus display we’ve seen and sharpness is superb. Granted, cramming an 800 x 480 pixel matrix onto a display this diminutive amps up the pixel density, but still — there’s no bad-mouthin’ this guy.

I believe the 3.58-inch 8-bit LCD sports IPS technology. The resolution at 260.6 ppi would have been higher than any other smartphone on the market except for the iPhone 4*. Only the rumored LG LU6200 Optimus LTE matches the Retina Display in terms of resolution, but with a larger 4.5-inch AH-IPS LCD and a 1280×720 pixel format.

Update: The HTC Touch Pro with a 2.8-inch display with a pixel format of 640×480 was good for a resolution of 285.7 ppi. Thanks Eric!

* Let me know if you know of any smartphones with a higher resolution.