3M unveiled an enormous 84-inch multitouch table at CES today, following up on the 46-inch display the company announced here last year. The table is still in prototype mode, but already supports up to 40 simultaneous touches, and features a display with 4K (3840 x 2160) resolution. That's a marked step up from last year's 1080p model, which supported just 20 concurrent touches.

The table's projective capacitive display runs on wired-based sensors, unlike the ITO-based sensors used in last year's version, which the company says allowed them to scale up without sacrificing performance. The idea is to use the table in educational settings, including museums and schools, though 3M has yet to announce a specific price. By the time the table hits the market in Q3 of this year, it should support more than 100 concurrent touches.