Windows 8.1 Auto Scaling feature may blur the screen or display some icons and texts larger.
Change the DPI scaling to fit for you as follows:
On the Start screen, click the [Desktop] tile to convert the screen to the Desktop screen.
Right-click with the mouse on the desktop and select [Personal Settings] > [Display], and then check [Let me choose one scaling level for all my displays].
Select an item size to proceed as instructed.