Tom Norton

Crowds were around the block for all of the 4K (and OLED) prototype displays at the show, including a 4K demonstration in the Sharp booth.

Don't expect to get a quick lunch at CES. The food services t the Las Vegas Convention Center were overwhelmed by the crowds, with early estimates at 140,000 show attendees.

The Smart Crystal Pro polarization modulator from a new (to us) company called Volfoni (which also makes both active and passive 3D glasses) can take your single chip active glasses DLP 3D projector and turn it into a passive glasses 3D projector. The brochure says it can do this for any 3D single lens projector, but the device has only been verified effective on DLPs.

What it does, in effect, is to substitute rapidly alternating polarization of the filter, which is positioned in front of the lens, for the switching of active glasses. You'll need a connection from the sync transmitter output in the projector to the Crystal Pro to make this work, or alternately DLP Link in the projector (DLP Link is a process that uses rapid interframe bursts of light from the DLP projector that normally triggers active glasses). (If your projector has neither, that is, no DLP Link and an on-board sync transmitter, it will not work, as I understand it. You'll also need a screen that preserves polarization. Estimated cost will be $1500 for the Crystal Pro itself, or $2000 for a package including both the Crystal Pro and a slide that can automatically move the polarizer out of the way for 2D material.

Toshiba was showing its latest prototypes of glasses free 3D. In comparison to last year's demos, the results were much improved. The secret appears to be the use of a 4K LCD panel, which ups the convergence available to each eye—much like the new, jumbo 4K set shown by LG appears to improve the (passive glasses) 3D performance of that set. If you’re watching 3D alone, the set tracks your head position and adjusts the picture to provide optimum performance. In a group showing, the 3D works properly only in 9 individual regions across the front viewing area. A small circular bug at the top center of the screen (visible in the photo) tells you if your head is in a hot spot for 3D. Toshiba expects to have sets in stores in late 2012. But the use of a 4K panel suggests that the first such sets will be expensive, so I wouldn't hold off purchasing a 3D set hoping to have a cheap, glasses-free alternative real soon now.