That's good to know, will keep that in mind. So if I'm understanding this correctly, theres no point in having ambient display on if AOD is already enabled, right?I have noticed a huge delay when switching between camera modes as well. I have found that if I switch to video and press record, it usually does actually start recording, even though you can't see anything in the viewfinder. I'm using a different ROM, though, so maybe it's just an issue with GCam and custom ROMs?
AOD is Always On Display. Ambient Display should just light up the screen when you receive a notification, then turn off again after a few seconds.