Measuring PWM Flicker
Overview
This doc describes how I test for PWM flicker in a display. To learn more about what PWM flicker is go here: PWM flicker.
Process for measuring
Get a smartphone
Set the photo mode to "pro"
Set shutter speed to the fastest possible. For example 1/12000s
Point the smartphone camera at a display to test for PWM flicker
Set the display brightness to the lowest setting (0%)
Now steadily increase the display brightness from 0% to max brightness (100%) and look at the phone's camera preview
If there is PWM flicker
you will see it as horizontal black bars that move up and down the display
The black bars will be thicker when the brightness is lower
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