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The world's first colour e-ink monitor is essentially a 25-inch Kindle
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this post was submitted on 04 Aug 2023
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It's not the blue emitting light that causes eyestrain on OLEDs, it's the low frequency pwm used to control brightness. Basically all the pixels turn on and off a few hundred times a second, not slow enough for your brain to consciously notice it, but fast enough for your eyes to react to what is in effect a strobelight right in front of your face. That is how dimming works on an OLED.
You end up with devices that still cause headaches and dizziness because they flicker in this manner, but are "eyesafe certified" because they filter out the blue light right before bed.
OLED TVs and desktop monitors don't use pwm, though they do have very slight brightness dips every refresh.
Afaik laptop and phone OLEDs do use (low frequency) pwm.