Kubrick got there in 1968. So it predates Apple as well.
ST:TOS used them predating Kubrick; I'm sure other shows or movies did even before that. ST:NG was late to the game.
I do remember in the early 2000’s some tablets started to appear, but their specs were very poor to decently run Windows.
Prior to that was the Newton, which was pretty decent for its time.
The best next thing were the Compaq (and later HP) iPaq Pocket PCs, running and ARM version of Windows Mobile. I remember paying $800.00 for one of those, plus the extended battery pack, plus a Pharos GPS, plus a $400 CF Card with a whooping 1 MB of storage (I can’t forgive myself for that! I think I still have it somewhere…).
I remember those. I had a Jornada (SP?). Still do somewhere.