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I've only caught flickering a couple of times under very specific conditions on my original Galaxy Note. Light background on the screen, low screen brightness and under fluorescent lights with old style electromagnetic ballasts. I knew that AMOLED screens controled the brightness by pulse width modulation, but had originally thought that they were pulsing the entire screen as a block and was a little suprised to see the "raster" effect (after some thought, I realised that pulsing the entire screen could lead to some pixels not lighting at all in certain timing scenarios).
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