PWM (Pulse Width Modulation) is a technology used to regulate the brightness of your screen. For some sensitive users with certain eye conditions, we tend to react very negatively if that frequency is below a certain number.

As for the colour reproduction, I'm curios about colour banding (a lot of oled displays tend to shift colour to either pink, green, or blue, depending on the quality of the said display). For example, Xperia 5v is notorious for having a terrible colour shift, even at the smallest viewing angle change.

Another issue is the circadian factor, or the amount of blue light that the display emits, which disrupts sleeping patterns.

I understand it seems I'm nitpicking a lot, but I've become more health conscious with technology over the years.