Originally Posted by Lee Stewart
And I thought we were discussing FPTV and 3D. That is the topic of this thread Dave.
We need to stay on topic and discuss positive and negatives for FPTV and active versus passive.
Agreed. Regrouping to keep the conversation FP focused.
The similarity is that LCD has latency issues which may negate some of the "pros" of active-shutter depending on implimentation. LCD and its sister technolgies LCOS and SXRD share many characteristics so the discussion of what we're seeing with some active-3D LCD flat-panels may extend to LCD/LCOS/SXRD front projection as well. Since at present we have no active 3D Projectors using the new full 1920x1080p spec, we can hypothosize about some of the pros and cons for front projection based on realted technologies in sequencing 3D flat panels.
For instance, the Samsung LCD has no reported flicker, but does have lots of reported ghosting, where as the Sony LCD has no apparent ghosting, but does have flicker.
What it appears is that the two manufacturers are addressing the latency in the on/off of LCD in two different ways (and we may see similar approaches with active LCD/LCOS/SXRD projection): Samsing is likely keeping their LCD blanking very closely tied to the left/right sequencing, and so the latency of the LCD in the image transition shows some mild ghosting (I noticed it much more during motion) but there's no visible flicker.
Sony may be putting in an all-black "transition" period where both eyes go black for a moment to give the LCDs a chance to switch state (my guess as to why they say their eyeware isn't interchangable with other brands). That eliminates ghosting, but at the cost of a little noticable flicker. These are my theories as to why we're seeing these trends, but they're a great point to start conversations about how different approaches can affect LCD/LCOS/SXRD 3D active projection.
that's one reason why I think that the optimal active 3D LCD/LCOS/SXRD projectors would be dual light engine... that way the shutter device in the PJ could do its job instantaneously without worrying about state-change of the imaging panels to have to produce clean instantaneous left/right sequencing.
DLP is probalby going to be the only single-light-engine sequencing left/right active technology that works because DLP really is instantaneous and can sequence left/right via the same DMD... though it probably won't work with color wheels as it would double rainbow artifacting potential. BUT LED or laser-lit DLP could be astonishing with single light-engine PJ design and active eyewear.
BTW, does anybody know what type of technology is inside a Real3D projector? Is it DLP or LCOS? I belive those are single-engine so I'd be very curious to know. I think I'll do some googling.