PWM flickering - your experience

[ricki]

Hi,

please tell your experiences about PWM-flickering in this thread.

Here is some info:

PWM (pulse width modulation) is used for dimming the backlight. Because LEDs react very quickly this technique can cause flickering (if the PWM module is cheap/poor).
Some people can see it - some not.

TEST:
1) Open a program with white background (e.g. Microsoft Word or empty Browser Tab)
2) Turn down backlight to about 30-50%
3) Move your hand quickly (like waving) in front of the screen (with spread fingers).

a) if you can see a stroboscope effect (like in disco / jumping fingers) the backlight of you monitor is flickering
b) if your fingers look soft and blurry there is no flickering

make a cross check in front of a surface illuminated by a "normal" lamp -> your fingers look blurry if you move your hand quickly in front of it


please post your experience with your displays - which one flickers and which not ?

I tested:
Eizo EV2335W (IPS-LED) -> test result: i can see flickering, and my eyes don´t like it :-(
Samsung 940B (TN-CCFL) -> test result: no flickering
Samsung 226BW (TN-CCFL) -> test result: no flickering

 

[CANTUSELCDLED]

Thanks for this man