NANasir Aziz Awaninkeyboardtesterclick.hashnode.dev·Jun 6 · 8 min readWhy One Screen Gives You a Headache in 10 Minutes (PWM Flicker, Explained + a Free Test)For about a year I had a screen that gave me a headache in ten minutes flat. My phone. Not every phone — this one, and only sometimes. I'd doom-scroll in bed at night and come away with a dull ache be00