Transflective LCDs have piss poor contrast and generally they're only good in direct sunlight. Who would want to read on that indoors and why? See for example the comparison video your other replier posted: https://youtu.be/AXHzY1IgJWw?t=370 I also have watches with RLCD and Amoled, indoors even on a very sunny day RLCD sucks.
And 4k for 20 inches display? What for? Do you plan to stick your face in the monitor?
