Hello everybody,
I try to learn more about PWM, for example in smartphones.
In the meantime I know that you can easily check PWM by using a normal camera with certain shutter speed. Works great. Also learned that the distance between those "black lines" shows a bit the frequency, and the size (how wide) shows the duty circle. So when the display is set to very dark, then those black lines under camera view are very wide.
Ok 🙂.
I only wonder that when I read tests or opinions from users, I mostly only see information about the frequency.
What about the following examples:
Smartphone A with PWM frequency 250 Hz, Smartphone B with 500 Hz, so the double.
Under camera view, both have similar looking black lines, just more in B. But I turned down the display brightness a bit more in B, 50% darker than A. So the lines in B are much wider than in A.
How does this relate then to the visual (maybe subjective) flickering of the two smartphones? The two aspects should more or less balance each other out? Or is the frequency so much more important? (and how does "amplitude" fit into those dimensions?)
I ask this as I usually only have PWM problems in dark display settings, even if the normal PWM frequency would not be the best. (using extra dim in Android also helps a lot!).
thank you !