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Review - test - comparison : LCD vs AMOLED Screen test and color test :

4.3-inch touch-sensitive display. This LCD screen has a resolution of 480 x 800 pixels. With its 4.3-inch dimensions, this translates to an overall pixel count of 384,000, giving the Desire HD has a pixels per inch (PPI) rating of 216.977.

the 3.7-inch touch-sensitive AMOLED display on HTC's phone is smaller. The screen resolution matches that of the Desire HD. But its pixel density is higher. With the same 384,000 pixels onscreen, the pixel density is 252.162 pixels per inch.