Great surprise, the ASUS X556 (Full HD model) doesn’t use PWM

asus-x556uq-xo076tWe kick off this week’s stream of news with great news and it’s about a fairly affordable notebook, the ASUS X556. We would like to note, though, we are talking about the Full HD variant and we still haven’t tested the HD (1366×768) version.

You can find some of the available configurations here:

Anyway, our oscilloscope didn’t record any light pulsations that might cause eye soreness or headaches even to users with extra sensitive eyes. You can see on the graph below that PWM is missing from 0 to 100% screen brightness. The change of the panel is more than welcome because the previous X555 model’s screen used PWM from 0 to 99% luminance for regulating brightness, although the frequency was fairly high (22 kHz) and thus reducing the negative impact on one’s eyesight.


Stay tuned for the full review with more detailed tests regarding screen quality, performance, and overall usability. In the meantime, check out our first impressions here.

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7 años hace

hi thanks for your work on pwm testing, it’s very helpful, but it looks like that a pwm-free laptop isn’t enough with intel hd gpu… I just bought a laptop which should have been flicker-free with a brightness above 50% (according to your reviews, mine is an asus k550vx with same panel you tested on k550jx, and that’s basically the same computer if you see). Unfortunately, in fact that’s not flicker-free, and many people think that’s intel hd graphics responsibility, that lowers the pwm frequency (and because of this many tools have been made to manually adjust pwm frequency), have… Read more »

7 años hace


In the article you are talking about ASUS X556, but on the image you have ASUS K556?