LCDs are actually infamous for making people dizzy, with the whole PWM thing. That's why many screens are advertised as "flicker-free". I am not an expert on t

LCDs are actually infamous for making people dizzy, with the whole PWM thing. That's why many screens are advertised as "flicker-free". I am not an expert on the technical side of things but google "LCD displays PWM dizzy" and you'll get plenty of links. Commonly PWM is used for brightness management, so the screen might be flicker-free at high brightness (the blinding one like they use in computer stores), and suddenly it starts to flicker when you turn it down.