Image quality is improved by PWM brightness, because the alternative is running at 100% duty cycle and changing brightness in software, which causes color bandi

Image quality is improved by PWM brightness, because the alternative is running at 100% duty cycle and changing brightness in software, which causes color banding because you're throwing away bit depth. Additionally, even slow (200Hz approx) PWM is well above the flicker fusion threshold for all humans, so no flicker is visible when your eyes are still. The problem is phantom array effect artifacts when you move your eyes. These appear and disappear in response to eye movement, so they can be perceived as motion, which is distracting to some people. I personally find PWM very obvious and annoying, but I suspect I have unusually weak saccadic masking.