Text and overall UI graphics in Unity build jagged when focused

After building my unity game in fullscreen exclusive mode, my UI (tets and Icons) looks very jagged round the edges. But if I choose to click on my oyher screen on another application I can see that it becomes much better and the edges are smoothed out until I click on the Unity build again. I think it must have something to do with tha game updating because I assume that the game is not updating when nother windows application is selected. Any help would be greatly appreciated, Thank you!