can i use an expencive 3d tv for NVIDIA 3D vision?

Depends on the refresh rate. Someone will probably correct me on this but I seem to recall 120hz being the minimum.

May also be displayport dependant, not sure.
 
In the traditional sense: no, you can't. You might be able to get it to work with some settings, but you would most likely get a limited refresh rate and/or resolution. There were some rear-projection TVs that were compatible with 3DVision, but apparently they were also more of a hack than actual native full compatibility.

As it stands, pretty much ALL the HDTVs are limited to 60Hz input. They can have 120Hz panels and thus 120Hz output, but that usually means interpolated motion features (which increases the input lag WAY too much, and is therefore not good for gaming).

There are some unofficial workarounds to achieve a genuine 120Hz input from some TVs, but it's not guaranteed to work. Furthermore, even if you managed to get the 120Hz input working, I think the main problem with Active 3D solutions is the proper syncing of the 3D glasses with the HDTV. If you use nVidia's glasses, then you can't make them communicate/sync with the TV's own 3D transmitter.

And now you're probably thinking of using the TV's own 3D glasses? Unfortunately, the 3D circuit in the TV is usually a separate system in the TV, so the 120Hz hack wouldn't apply there, so you would again be limited to the 60Hz input signal for the 3D.

Or that's how I understood the situation few years ago. Not sure if they have made some progress/modifications in that area during the years. But considering the 3D phenomenon is (and has been for a while) slowly dying out, I wouldn't hold my breath for a compatibility fix.

But on the contrary, there are some fairly easy workarounds with Passive 3D TVs, instead: with custom monitor inf-overrides, I have been able to get my Passive 3D HDTV to work with with 3DVision. This takes advantage of the fact that there are some Passive 3D monitors, which have been officially made compatible with 3DVision. By cheating the computer/GPU to believe you are using one of those monitors, you can apply it to HDTVs, as well (in addition to actual Passive 3D monitors). I'm myself using the Acer HR274H inf-override.

But for Passive 3D HDTVs, there's also the TriDef3D, which works without any overrides or hacks. Though bear in mind, the development isn't as extensive as with 3DVision and thus the game support is more limited. But the good part about TriDef3D is that it works with AMD's cards, as well.
 
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