Safe guide and grid lines
Safe Guide
TV screens from different manufacturers have different 'active' screen areas. The safe guide is a good way of making sure that your design will display well on different screens.
Area 1 in the picture below is the title safe area. You can put anything here and it will be fine.
Area 2 is the action safe area. You may get some distortion here depending on the screen.
Area 3 is the unsafe area. Older screens may cut off this area so best to keep your text and logos out of this area.
Grid lines
Grid lines are useful if you want to line up different elements of your design.
A bit like adding a graph paper overlay to your work, it helps you align elements but won't be visible on the screen.
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