LG 65" adds changing convergence on top of real 3D - AVS Forum
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post #1 of 3 Old 07-28-2012, 05:39 PM - Thread Starter
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Just got a LG 65" 6200. Comcast 3D. Oppo 93. The display is adding convergence changes over 3DHD Olympics, Blu-Ray Ultimate Wave Tahiti & everything 3D. I can even see the L & R moving when paused, so it's not the source material. I've seen this on ESPN3D at Best Buy on other displays & thought it was a goof from their feed. With 3D glasses, the added effect is hardly noticeable over the real 3D, but it must be adding eye strain. Any ideas what's happening and how to turn it off?
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post #2 of 3 Old 07-30-2012, 03:11 PM
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Sounds like what you are seeing is the missing 540 (even) lines from one eye being overlayed on top of the odd lines, and vice versa for the other eye. This is what LG does to claim that all 1080 lines are shown to each eye.

http://www.hometheater.com/content/closer-look-active-vs-passive-3d-flat-panels
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LG claims that its FPR panels are actually displaying all 1080 lines of information for each eye, but not at the same time. In the first 120th of a second, the odd lines of the left image are displayed in the odd lines on the screen and the odd lines of the right image are displayed in the even lines on the screen. Then, in the next 120th of a second, the even lines of the left image are displayed in the odd lines on the screen and the even lines of the right image are displayed in the even lines on the screen. (For more on this, see my discussion here.) This is very similar to interlacing, which has its own problems.

However, this puts some lines in the wrong place—even lines from the image in odd lines on the screen and vice versa—which would cause a slight but noticeable vertical judder. And even though all 1080 lines of information for each eye are being displayed, each eye sees only 540 lines of resolution at any given instant. Not only that, objects behind or in front of the screen plane will exhibit interlace artifacts.

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post #3 of 3 Old 07-30-2012, 03:57 PM - Thread Starter
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Not quite. Without wearing glasses but looking at the 3D picture(s), both images slide exactly as if you are changing the 3D Viewpoint back & forth with the remote. This happens for 2 or 3 seconds and then lock together, only to repeat 10 or 20 seconds later. I think the auto-3D feature.is involved somehow and it is searching for something to lock on. It's easy to see the sliding when looking at the NBC logo in the upper right corner.
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