Crosstalk is a timing issue. The reason it's a timing issue is that with LCD's they have a slower pixel response time. DLP is basically instant so it doesn't happen, at least in theory. But proximity in my case causes crosstalk due to the LCD shutters close proximity to the screen so crosstalk can still happen. I went and figured worst to best at one point awhile back.
I think it went:
Active LCD, Passive LCD, Plasma Active, DLP.
However, there are other factors, including content that can make crosstalk more prevalent.
Number one cause is the angle and distance to the screen. A bad seating position can make any of the 3D displays really awful for 3D, even DLP. Passive can be pretty bad if you're not seated dead center in the screen, too high, low, to the side or too close and you have crosstalk.
Content. It's the high contrast scenes with wider parallax that cause crosstalk the most. I have even seen it on my DLP PJ, so DLP isn't technically crosstalk free. However, when I do see crosstalk it is because of the distance to screen which I believe is a problem with the LCD shutters in relation to screen position. When you have a 140" screen and you're seated only 11 feet away plus bright images that have wide disparity there's some light leakage at times as the LCD in the glasses are just too close and don't perform as well as further back. When I moved to approx. 14 ft, the crosstalk went away in those scenes.
I noticed this most recently throughout Batman V. Superman, in the Daily Planet scenes, heavy crosstalk on my DLP BenQ 1070 and a few other scenes. And if I can see it on my DLP PJ, I'm sure it's even worse on a passive screen.
What they can do to fix this is lower the brightness in those scenes while also toning down the amount of parallax. This shouldn't be a problem with any converted movie, native movies it could be an issue since parallax is burned in at filming. I would say the wider parallax is the most common cause more than brightness, just because when I produce my own content in 3D I will notice it, even in lower contrasting images. Comfortable parallax is probably the most important aspect to 3D. High contrasting images will make it worse, but if the disparity is closer, it's less likely to leak from one eye to the other across all types of displays.
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