u/Majestic_14061987

AMOLED will always be bad

I, like many here, am sensitive to pwm and choosing a smartphone is now quite a difficult matter. I have reread many topics here where people can't find the real problem why their eyes hurt. Many people are really led to marketing like "PWM 2000 Hz" and don't understand where eye fatigue comes from. The fact is that AMOLED screens have the so-called phase PWM, or a natural brightness drop, which is tightly tied to the refresh rate (the same 90 or 120 Hz). When the matrix updates the image, the transistors drop the voltage for a microsecond to record a new frame. That is, even if you turn the brightness to 100% and naively think that the classic PWM is turned off, the screen still continues to micro-flicker in time with its hertz simply due to the peculiarities of the OLED architecture. And it is this low-frequency drop at 120 Hz that is the worst enemy for the eyes, which is usually not taken into account. Our brain still somehow filters the high frequency of PWM, but the constant fluctuations of the light flux at a low scanning frequency are perceived by the body as a heavy load, which then suddenly causes a headache or stinging in the eyes after half an hour of scrolling. Manufacturers are attempting to mitigate these dips at the hardware level in new LTPO panels, but completely eliminating the effect is currently physically impossible—it is a fundamental drawback of the pixel-addressing technology that simply has to be accepted. In other words, it is a deeply flawed technology with numerous downsides, and the quest to find the "perfect" display will never yield a result.

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u/Majestic_14061987 — 5 days ago