Thank you for responding! I'll try to explain my issue a little better. It's not the screen going black after I lock it. I know that is normal.
I have the ambient display turned on. The blink happens when I go to unlock my phone from the ambient display (whether that be a double tap or using the power button) then let my the screen turn off by itself and wait for the ambient display to come back on. The ambient display will be on for a couple of seconds (clock and notification icons will be be there), after that couple of seconds, the clock and all my notifications and info will blink. The entire ambient display does a flicker. It's almost like a glitch, not a white flash or anything. The ambient display simply, goes black very quickly and then comes back on.
--This also happens when I get a new notification and the screen wakes up, then goes back to the ambient display. Again, after the ambient display is shown for 1 or 2 seconds, the clock and everything does the "glitchy" blink.
One way I could describe it is if you have a loose light bulb that isn't screwed in all the way and it's just flashing on and off when you go to touch it.