I was looking at the Sony A90j OLED Review where it said this: “Because it’s an OLED, the Sony A90J doesn’t have a backlight, but it can still emulate the Pulse Width Modulation (PWM) of LED TVs by turning its pixels on and off. For that reason it isn’t flicker-free; the slight dip in brightness that you can see in the chart every 8 ms is due to the TV’s 120Hz refresh rate.” So does that mean even if an oled such as this Sony A9S, LG C1, LG CX etc. even if there’s no backlight and no reported PWM rate can you still get eye strain and headaches from these OLED Tvs? Thank you as always!