3 ms·
But then wouldn't our 60Hz screens have a much bigger impact on office workers than the lights above them?
by kabes 9y ago
But then wouldn't our 60Hz screens have a much bigger impact on office workers than the lights above them?
- IshKebab 9y agoScreen backlights aren't turned on and off at 60 Hz.
- pvdebbe 9y agoThe screens have separate backlight which is done with other technologies and if with leds, definitely with higher frequencies than 60 Hz.
- tech2 9y agoScreen refresh rate (rate that each image is replaced) is a lot different to the frequency of the PWM applied to the backlight. If the backlight were pulsing at 60Hz people would be _very_ upset.
- garaetjjte 9y agoOn CRT screens yes, but backlight in LCD screens is LED/fluorescent driven by much higher frequencies. Though some LCD screens still flicker, but it is visible only on special patterns: http://www.lagom.nl/lcd-test/inversion.php http://www.lagom.nl/lcd-test/inversion.php
- TMSZ 9y agoNot necessary much higher. I've measured screen flickering in Lenovo T500 (probably one of the oldest laptops with LED backlight) with small solar cell and oscilloscope and it's 220Hz, with lowest brightness setting only 100Hz (although this brighness level is not too useful): http://commonemitter.blogspot.com/2017/06/lenovo-t500-measuring-screen-flickering.html http://commonemitter.blogspot.com/2017/06/lenovo-t500-measur...