It is odd to me that Apple displays exhibits PWM at 100% brightness level, where only the display scanout brightness dip/flicker should be shown. Is there a way to force higher brightness levels on the IPhone? Which refresh rate have you used when doing this test? Have you verified whether setting the brightness to 100% in settings is equal to setting it 100% on hardware level? Could you tell us which photodiode you've used?
BPW34 photo diode. Refresh rate was automatic on the iPhone. Content refresh rate does not affect display brightness, so would not be visible on an oscilloscope, I think.
I suppose 480Hz is a practical limit although some vision tests suggest 1400Hz (and up) should be a minimum. That is the OLED brightness PWM refresh rate I assume (and not the variable image refresh rate)
This is to verify PWM frequency used by Apple iPhone 15, some people may find it useful. I personally sensitive to PWM getting eye strain and migraines, even though 480 Hz is generally considered safe.
at ~15% its always 240 ?
It is odd to me that Apple displays exhibits PWM at 100% brightness level, where only the display scanout brightness dip/flicker should be shown. Is there a way to force higher brightness levels on the IPhone?
Which refresh rate have you used when doing this test?
Have you verified whether setting the brightness to 100% in settings is equal to setting it 100% on hardware level?
Could you tell us which photodiode you've used?
BPW34 photo diode. Refresh rate was automatic on the iPhone. Content refresh rate does not affect display brightness, so would not be visible on an oscilloscope, I think.
Respect 🫡
I suppose 480Hz is a practical limit although some vision tests suggest 1400Hz (and up) should be a minimum. That is the OLED brightness PWM refresh rate I assume (and not the variable image refresh rate)
which light sensor did you use?
A photo diod
Whats purpose of this test
This is to verify PWM frequency used by Apple iPhone 15, some people may find it useful. I personally sensitive to PWM getting eye strain and migraines, even though 480 Hz is generally considered safe.