10 ms·
I'm afraid he does indeed talk about PWM. Sadly, lots of LED fixtures and displays (especially in laptops) still have atrociously low PWM frequencies...
by dahauns 10y ago
I'm afraid he does indeed talk about PWM.
Sadly, lots of LED fixtures and displays (especially in laptops) still have atrociously low PWM frequencies...
- kuschku 10y ago60Hz PWM wouldn't even work in laptops – you’d have, at 60Hz refresh rate, only the following colors available: black, red, green, blue, yellow, magenta, cyan, white. As, for each frame, you could turn each pixel only either on or off. 8 colors isn’t exactly 16 million colors. To get 8-bit colors, with PWM, you need far higher refresh rates. For OLED, that’s 15.3 kHz minimum to get sRGB colors with PWM. If you only need to dim backlight, 4kHz is usually enough.
- dahauns 10y agoHuh? I'm talking LED backlights and lamps that regulate brightness with PWM. No color generation involved here. And these can get really ugly: https://www.notebookcheck.com/Test-Lenovo-Ideapad-310-15ISK-Notebook.173278.0.html https://www.notebookcheck.com/Test-Lenovo-Ideapad-310-15ISK-...
- kuschku 10y agoWTF That’s all I can say about that. That said, you were mentioning laptop displays, and the topic was OLED, that’s why I was mentioning why for OLED 60Hz is basically impossible. And as the display of that Ideapad has around 50 brightness steps, you get a real refresh rate of about 1Hz. That’s insane. As mentioned, I’ve tried this with the LEDs I’m using to light my room, and below a few kHz I get nausea, and so does the rest of my family.