One problem is that cheap LCD displays are not easy to source. E.g., the largest old school lcds I find are 4x20 characters, which is a bit confining.

There seem to be tons of TFT options out there on the cheap, but they're probably not great in terms of eye strain and power consumption.

If price is no object, then e-ink displays seem a great choice, e.g. $70 for a 7.5'' display: https://www.banggood.com/Waveshare-7_5-Inch-E-ink-Screen-Mod...