Originally Posted by cybereality
I think icester is right. I've been into 3D for some 10 odd years now and I'm a regular over at MTBS3D.com, and no one, I mean NO ONE, has ever been able to explain to me how DLP-Link works. Believe me, I've asked. Not a single soul can figure out how the content syncs with the glasses. Now this gets confusing because DLP-Link does indeed seem to work on DLP RPTVs (like the Mitsubishis) but those are checkerboard based, so the L/R encoding is baked into the input stream. However these 3D-DLP projectors appear to be accepting a generic page-flipped input (ie Nvidia 3D Vision). This works for the Nvidia glasses since the sync is done through the computer (ie the video driver itself knows what image is left or right). However if you just send that stream to a projector it just looks like 120 independent frames per second. It has no clue which frame goes to the left eye or right eye (or if the video is even 3D at all). The only way the projector could know this is if there was some encoding on the frame (aka blue-line) but it is not confirmed if this is happening or not.
Really, what I want is to see a link to an official PDF of the DLP-Link spec on TI's servers clearly explaining how the syncing works, or at least one of their engineers to go on the record and tells us the straight dope. There is no reason for there to be so much confusion going on here. Every other 3D standard since the beginning of time has been completely open and public on how it works, even proprietary solutions like Nvidia 3D Vision or RealD's z-Screen. I see no reason for this to be some huge secret. Unless the huge secret is that there is no standard, the whole thing is bunk, and CEMs have been selling bogus "3D Ready" equipment that doesn't actually work. In that case, I can see the reason for the secrecy and, in fact, all signs point to that being the actual reality of the situation. But please, someone prove me wrong. Post just one credible link that lists the specs of DLP-Link and explains how the content is able to sync with the glasses.
It is very simple method.
DLP-Link requires that left and right images are combined using predetermine mosaic interleaving called checker board. When DLP-Link is enabled the firmware turns on the left image pixels and flashes the white light code for left eye shutter to open and then it does the same for right
image pixels. Since the order is always the same there is no need to for DLP checker board TV to receive separate sync signal.
The problem with DLP-Link projector is the 720p low resolution. If checker board was implemented on such DLP-Link projectors there would be only 360 lines of resolution per eye. So the checker board was not implemented and since nVidia did not and does not output
any eye phase sync the TI had no way to get full resolution DLP_link system implemented.
The result is what we have now and that is a partially working method with manually correctable eye order
and totally dependent on stability of nVidias 120 Hz quad buffer.
Finally one can just get a refund for DLP-Link glasses, and continue to use nVidia's 3D Vision Kit glasses.
120 Hz mode on nVidia system is only enabled with 3D Vision Kit so every one who buys DLP-Link projector must buy nVidia's 3D Vision Kit.