The question What's the name of cardboard wall DMs use to hide their part of table? has a fairly clearcut answer--"X Master's Screen," where X is "Game" or "Dungeon" depending on the speaker, the game being played, and possibly other regional and/or cultural factors.
The Wikipedia article on the subject linked from the other question gives a quick history of TSR products called "Dungeon Masters/Master's Screen"s, from the late '70s onwards. The first such made by TSR was released with, or shortly after, the first Advanced Dungeons and Dragons (often retconned as "D&D 1e") books. I started playing tabletop RPGs around that time, and I remember the product having, on the DM side, a straightforward reprinting of a number of useful tables selected from the Player's Handbook and the Dungeon Master's Guide but mostly from the latter. I also clearly remember the art on the "outside" facing the players of the edition of the screen I saw most often--the fat, grinning demonic idol also pictured on the cover of the first few printings of the AD&D Player's Handbook:
I'm calling attention to the art here just because it may jog others' memories. I'm interested in knowing whether TSR coined the term "DM's Screen," which then (at least in my gaming circles, for what it's worth) became a universal term for that accessory, regardless of what game system was actually being played. Or were there already similar products from other publishers on the market (or were people making homebrew versions) and TSR just used the prevailing jargon?