(Pulse Width Modulation) means that the display is flickering in a particular way (in order to regulate brightness). Set your display’s hardware brightness to 100% and instead regulate brightness in a software way with apps like f.lux or Iris. Software dimming doesn’t produce PWM.
(TD) means a device (display, videocard…) cannot display some of the necessary shades, so it chooses the two nearest shades, and flickers between them very fast instead. On Windows (Intel GPUs), this can be disabled via
Minimal brightness is too high: There are many apps that can apply a black filter to the screen and thus reduce the screen brightness below the minimal system brightness.
, some such apps are Screen Dimmer, Screen Filter, Darker, Twilight.
, one such app is Dimmer.