are you talking about the magnifier screen looking thing that sits next to his couch (and is also in his bedroom and in Bryant's office LOL)? or the VidPhon that sits on top of the Esper? The VidPhon doesn't have a polaroid on it but there is one randomly sitting by itself in front of the esper. It's just not attached to anything.
If you mean the magnifier, I coined it the "BeoScreen" because it's build on a B&O Beomaster audio receiver. I'm the first to have a replica so I figured that entitles me to be able to name it
. No idea what it's in-universe purpose was supposed to be but it was such a cool looking prop I had to build it. It actually has TWO Polaroids! One polaroid SX-70 and one SX-70 SONAR version. the sonar is in front and the regular one is in the back behind the screen.