With a video of course! This is a video comparing three generations of screen on HTC devices. It shows the older LCD tech of the HD2, HTC EVO, and others; the AMOLED tech of the Nexus One, and old Desire; as well as the new SLCD to be found on the new Desires, and others. HTC was forced to adopt a new screen tech during the great AMOLED shortage of 2010. They opted for the Sony-designed SLCD, which is now shipping in a number of new phones. It looks like the SLCD is better in most ways, but don’t just listen to me; watch for yourself!
http://www.youtube.com/watch?v=LqkMxWEAG_E