Mar 9 2011, 03:11 PM
and more news on 3D pj :
Projecting 3D
Just heard you guest-hosting The Tech Guy radio show, and you were talking about the JVC 3D projectors. Do you need active-shutter glasses to watch a 3D projector like the JVC at home?
Thomas Terry
The JVC and most other 3D home-theater projectors utilize active-shutter glasses to view 3D images. These projectors use an IR emitter that bounces its signal off the screen or is mounted above the screen pointing at the audience to synchronize the glasses to the alternating left and right images. The advantage of an active-glasses system is that it can be used with a normal projection screen; the disadvantage is that the glasses are very expensive at roughly $150 a pop. The flagship JVC DLA-RS60/X9 (pictured above) ships with an IR emitter and two pairs of glasses, but the RS50/X7 and RS40/X3 do not, so you must buy the emitter and glasses if you want to watch 3D on those models.
A few projectors use passive glasses—for example, the LG CF3D and Runco D-73d use passive-polarized glasses, which requires a special polarization-preserving silver screen that doesn't work all that well with 2D images. On the other hand, the glasses are much less expensive and lighter in weight. The SIM2 C3X Lumis 3D uses a technology called Dolby 3D, which employs passive glasses but not polarization, so no special screen is necessary. Click here for an explanation of Dolby 3D, here for a discussion of passive-polarized 3D, and here for some info on active-shutter glasses.
link : http://www.hometheater.com/content/3d-pjs-...width-vs-height
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