[glowingly]

Nowadays, I think it is doable with modern displays.

My 165Hz 1440p 32" (31.5") LG with 8 bit color and two external speakers consumes ~20W, measured at the wall.

My 14" laptop screen is about 19.8% of the area of that display. I have loosely measured it from ranges of ~<1W at min brightness to ~8W at max brightness. It is 1440p, 60Hz, 14", HDR (DV). I usually run it at ~20% brightness, which seems to be around 3W.

My office has the usual LED lighting at night or a large window + sliding glass door during the day. Not a dark cave by any means!