2 PSU, how to keep from back feeding?

Here is my project, I have an DMD LED display running on 110v, I also need to hook up a Buckregulator to run the display off a 12 V battery.

To keep from back feeding into the PSU or Buckregulator , is it as simple as putting inline diodes?

Thanks in advance

Linc

Yes.
Make sure they are rated for enough current and reverse voltage.

CrossRoads:
Yes.
Make sure they are rated for enough current and reverse voltage.

Easy enough done, thanks!