I have a LG Cinema 3D TV from last year. Don't know if it's active or passive but dizziness has never happened to me.
The one that you have is a Passive 3D TV, the same way as you watch in movie theaters. I guess that's why LG named it Cinema 3D TV. You might feel dizzy or nauseous while watching an active 3D TV because the shutter glasses keep flickering and it gets slower as the batteries run out. And electromagnetic wave from the active 3d glasses might have something to do with it.