Having a good look at some of the images of the display of Nokia Lumia 920, some readers were wise enough to point out a major contradiction to the reality. Out of the two images, one with a resolution of 768×1280 and other with 720×1280, it was seen that the low resolution screen was displaying more no. of apps than the higher one, which was completely opposite to the expected results.
Actually, the two HD resolutions Microsoft has introduced with Windows 8 have work at different dpi scales. While the 768×1280 has the same aspect ratio as 480×800, it just sharpens the screen by 160%. Similar results were expected with 720×1280 resolution, offering a little less sharp display. But there was one problem that Microsoft encountered. It was that the approach would break compatibility with existing WP7 apps designed for 480×800, as there simply wouldn’t be enough horizontal space once you scaled them up to 160%. So, Microsoft came out with a solution to add a third dpi scale for 720×1280: 150%. This resolution displays same amount of content as in 480×800 and 768×1280, but leaving extra 80 rows of pixels, both horizontally and vertically. This resulted in the present scenario with more space on low resolution display, though with a little low sharpness value.
One of the reasons that might be the cause is the demand of Nokia to keep their Nokia Lumia flagship superior to other Windows 8 phones. This allowed them to use that “HD+” as their promotional signature while Samsung and HTC relied on their Android versions for the most part. So, while Nokia Lumia 920 display is brighter and sharper compared to others, it is paying a price for it as well!