This room has a big screen and several control panels. The control panels aren't important, they're there just as an excuse to make it look like the occupant of the room is working, when all he's doing is staring at the big screen. This room is used for surveillance, the big screen being able to show what any opponent of Aizen is doing at the current time. That's why Aizen spends so much time there. He claims that it's because he wants to learn as much as he can about his enemies, because knowledge is power, but nobody believes that. Everybody knows that he's a couch potato and a TV addict. Nobody can begrudge it. Whatever Kurosaki Ichigo is doing, it beats soap operas.