Find out why the Google Pixel 3a is a real alternative in the mid-range sector in our review of the Google Pixel.
As you can under the pwm section, the pixel 3a uses screen flickering at ~200mz to lower brightness instead of lowering the voltage of the displaywhich can be straining for the eyes. You can check by looking at the pixel screen at low brightness with another camera and you will see a helicopter effect of screen flicker.
Here's an article about pwm & dc dimming: https://www.androidpolice.com/2019/07/24/what-is-dc-dimming-and-why-are-phone-screens-getting-it/
I'll do some research and check if the pulse frequency feature under klapse helps. or that other backlight dimmer option.
Okay Klapse does work in stopping pwm but it has some downsides. Steps:
1. Set adaptive display brightness off
2. Set brightness to 100% where pwm is not present on the pixel 3a
3. enable klapse mode 2 (brightness dependant mode)
4. set dimming in EX kernel manager to 90% (or whatever you want)
Notes: the problem with this is you have to set brightness through the kernel management app and the min brightness is not as low as stock...
Better alternative: use OLED Saver app. This allows setting brightness manually in the notification tray and even has adaptive brightness built in.