The Nokia Lumia 510 has a standard issue LCD screen of WVGA resolution. AMOLED is clearly out of the Lumia 610's league and even a Nokia ClearBlack display would've been way over budget. Overall, the difference from the ClearBlack screen of the WP8-powered Lumia 620 is easily spotted - and it's certainly not in favor of the Lumia 510. The 4.0" diagonal translates into a pixel density of 233ppi: WVGA is stretched quite thin on the 4" screen.
Contrast is quite poor and the Modern UI that we quite like doesn't look its best. The sunlight legibility is mediocre at best. The highly reflective display is nearly unusable outdoors on bright sunny days, so untypical of Nokia phones.
Here's how the Lumia 510 stacks up against the competition.
|Display test||50% brightness||100% brightness|
|Black, cd/m2||White, cd/m2||Black, cd/m2||White, cd/m2|
|Nokia Lumia 510||-||-||-||0.45||409||904|
|HTC Windows Phone 8S||0.18||243||1327||0.47||624||1318|
|HTC Windows Phone 8X||0.17||174||1017||0.49||501||1020|
|Nokia Lumia 820||0||260||∞||0||422||∞|
|Nokia Lumia 920||-||-||-||0.48||513||1065|
|Samsung Ativ S||0||129||∞||0||302||∞|
|Nokia Lumia 900||0||347||∞||0||425||∞|
|Samsung I9300 Galaxy S III||0||174||∞||0||330||∞|
|Apple iPhone 5||0.13||200||1490||0.48||640||1320|
And here's the screen under a microscope to get a better idea of how the pixels are arranged, and how big they are.