Originally Posted by The_Chief
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After a time-out period, it should remain off unless moved: coming out of a pocket, turned over, etc. THEN only the pixels required for the S-view notifications will come on. AMOLED screens have no backlight: so each pixel is separately powered. If the phone is only turning on those few pixels required for the notifications, that saves battery power.
That's how I understand it, anyway
Well it's going to move while in your pocket, but I can see light detection working for that. Thanks for the insight!