Quote:
Originally Posted by Jason90
It does this on all brightness levels except with brightness and natural light both at 100%,i.e when all the leds are on.
As far as i understand this is PWM (Pulse width modulation) which is the worst culprit of eye fatigue and headaches ,totally beats the point of an ereader!
|
Interesting. It should not be doing PWM on 100% brightness even if natural light is at 0.
As for PWM causing eye strain, the studies I've seen suggest that about 10% of people are affected IF the PWM is running at too low a frequency. If the frequency is over 200Hz, I was unable to find a study that showed evidence of eyestrain.
Given the issues with LEDs and attempting to control brightness by current modulation, PWM is going to be used with virtually all LED lighting though some monitor manufacturers such as Asus are using a combined approach mixing PWM and current modulation.