So you're interested in buying a Cinema 3D tv, I see. I own a LG Cinema 3D TV myself and it is true that its picture quality is superior. The superior image quality, flicker free quality and crosstalk free quality are all related to the technology behind the screen.
Other 3D tvs, such as those from Samsung and Panasonic, fall into the active 3D tv category.
Active 3D tvs use shutter system technology. Each image frame has a black frame immediately behind it and the images are projected as the 3D glasses' shutter "turns on and off." Because the image frames move so slowly, you see the images flicker.
Another problem with active 3D tvs is crosstalk. Crosstalk is when you see a duplicate of a single image. They do exactly the same thing side by side. How the 3D glasses work is when one of your eyes see the image, the other eye is supposed to see the black frame. But sometimes both of your eyes see the same image, creating a dopleganger of the image.
All the active 3D tvs have this flickering and crosstalking problems.
As you mentioned, LG Cinema 3D tv is flicker free because it's a passive 3D tv.
I'm thinking about purchasing a Cinema 3D TV. I know that it gives better picture quality and uses lightweight 3D glasses but I'm not quite understanding the 'flicker free' part. What does that mean? Do other 3D TVs have flickers?