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The issue with OLED is that like most tablets they have a glossy reflective screen. The reflections on ANY glossy screen will give a headache due to unconscious changing of focus between reading distance and how far away the reflected object is, which can even be your face as it's twice the distance in a reflection.
OLED has other issues. It is not real LEDs, but diode like electroluminescent dots that give a violet light. Red, green and blus phosphors are used and, unlike a filter, they wear with use or sunlight. They wear out at different speeds too. There may also be a filter. An LCD panel might last 20 to 50 years or more, but OLED wear out. Cheaper ones also can fail due to moisture getting in. The life of an OLED maybe be less than 5 years with colour (hue) shift before that.
The black isn't perfect, except in the dark, due to reflection.
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