Sounds like you're duplicating your surface screen to your TV. Can't you extend it instead? When you duplicate it, you're just showing the same thing on both the surface display and the TV. If you extend it, you have two displays: your surface and your TV, and each displays a different desktop. Then you should be able to utilize the true resolution of each display. Right-click on the desktop and select "Display settings". Not sure exactly the setting in there because my win10 laptop has no external display connected to it at the moment. On my win7 desktop, there's a selection called "Multiple displays" which has options "Duplicate these displays", "Extend these displays", "Show desktop only on 1" and "Show desktop only on 2". Mine is set to "Extend these displays", since I have two monitors. If I set it to "Duplicate these displays" it shows the same thing on both monitors.