What makes the display black?

What makes the display color black? The tint between the actual display and the overlying glass, whether laptop or cell phone, is always dark, what is that color? An electrically conductive paint, a special film,?

Hello you and thank you for any answers

Black is always placed behind screens, since the colors come into their own better, has been used since the tube TVs (Black-Trinitron e.g.)

Thank you very much, but that in no way answers my question. The actual display, or the surface is initially not black / dark during production, is then blackened. What is this blackening made of, it has to be conductive, then comes a conductive transparent liquid that is UV-cured and with which the glass we touch is glued.