There many high resolutions PCs, The Surface Pro, Lenovo ThinkPad Helix, Toshiba Kirabook, Dell XPS 12 to name a few. However, the user interface is often too small with text that can be hard to read and touch targets that are too small. With Windows 8.1 Microsoft adds full support for high density displays, introducing automatic scaling for UI in these devices.
According to Microsoft’s Jensen Harris,
“Text might not be as sharp on apps that aren’t ready.” director of the Windows User Experience team. In Windows 8.1 you can scale up 200% in both the desktop and metro mode. Microsoft has updated many of the first party Windows apps including Windows Explorer to look better in high density displays.
According to The Verge:
Harris expects there to be a transition process as developers update their apps to take advantage of the higher resolution, but Windows 8.1 will still be able to enlarge their pixels in the meanwhile. As for the virtual keyboard, which has been a pain point in several of our touchscreen laptop (and desktop) reviews, Harris says that it too will be sized appropriately for the screen size and resolution of high-density displays. You won’t be able to resize the keyboard yourself, though: the manufacturer — not the user — will adjust it to match the size of fingers on the screen.
With 4k displays to become mainstream in the next couple years, Microsoft is proactively future-proofing Windows 8.1.
Source: The Verge