I'd not read novels on anything other than eInk.
But textbooks are almost all fixed layout.
Medical ones would need colour.
Many have very stupid DRM
A 10" 1920x1200 IPS LCD tablet would be a minimum. A higher resolution approx 13" would be better.
Remember to use minimum brightness and have no daylight or room lights reflecting off the screen as that causes eyestrain due to refocusing.
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