Inspiron 17R 7720 SE Glitchy Screen

My Inspiron 17R 7720 SE has a display screen issue. From time to time there will be a horizontal grey bar around 1/4" tall that will roll from the bottom up to the top of the display and then disappear. At other times the display will cut to a grey/white blank screen that kind of "vibrates" between medium grey/white and light  grey/white. This glitch may happen randomly or if the computer is moved or jarred. If I shut the lid or press the power button to hibernate the computer for a minute or so and then wake the computer up, it will resume with a proper display exactly where I left off. It may run a couple of minutes and repeat the glitch, or it may run the rest of the day until I shut it down without a problem.

I ran the F12 startup diagnostic routine which indicated the display adapter was performing normally, so I'm guessing/hoping this glitch is a display screen issue and not a display adapter issue. Has anyone else encountered this issue and identified the problem? Are there any more diagnostics I can run to isolate if this is a display screen or display adapter issue?