Oooooh, neat! 25th-century alternate-timeline new display technology: a transparent glassy panel on which an image appears.
Regions of the #display panel that aren't displaying an image are transparent, like glass, but the displaying region is opaque and emissive.
And guess what? That now exists in real life, a few centuries early, in the form of the transparent #OLED display! https://youtu.be/l6O74AwrLf4