Definition of "telescreen"

Too many millions of people, watching their telescreens, had seen his unpardonable arrogance.

1973, Robert Theobald, Stephanie Mills, The failure of success: ecological values vs. economic myths

She pushed buttons at a new, small oval kind of telescreen, quickly gathering together the high-level authorizations it had taken hours of preparation to collect.

2002, Teresa Plowright, Dreams of an Unseen Planet