Their method is a photo detector driving the oscilloscope, right?
How can they assume the rise/fall slope in those plots is characterizing the driving electrical signal? Wouldn't a PWM driver be able to have much faster transitions and look more square than that at these time scales?
It makes me wonder if this is the response of the organic phosphors and the difference in apparent "depth" of the dip is really just a difference of duration, since the dips are very V-shaped, rather than bottoming out.
It is slightly odd that it has this paired rhythm, but I don't think you can assume it is "DC-dimming" rather than just PWM quanta that are being anti-alias filtered by the phosphors and measurement methodology.
How can they assume the rise/fall slope in those plots is characterizing the driving electrical signal? Wouldn't a PWM driver be able to have much faster transitions and look more square than that at these time scales?
It makes me wonder if this is the response of the organic phosphors and the difference in apparent "depth" of the dip is really just a difference of duration, since the dips are very V-shaped, rather than bottoming out.
It is slightly odd that it has this paired rhythm, but I don't think you can assume it is "DC-dimming" rather than just PWM quanta that are being anti-alias filtered by the phosphors and measurement methodology.