This is called Pulse Density Modulation (PDM) since it is no longer the exact pulse width but the average density of the pulses which conveys the analog value.
The flicker frequency " for lack of better words" of 30 is too low. For a TV that's ok as usually pixels are not turned from full on to full off etc.However PWM dimming does just that so the min frequency that will not be noticed by most people is 100Hz.
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