What is the difference between 3d tv and a hdtv ? is it the frequency ? is it the contrast rate ?

Maybe this will help some. For 3d you actually have two 2d movies. One for the left eye, one for the right eye. 3d cameras have 2 lenses spaced apart like your eyes, filming at the same time, then both movies on put on the screen at the same time. That is why you see double images of a lot of images because they space far apart, or not so far apart depending on how far from the camera they where at the time of filming. For something to look in front of the screen the image for the right eye must be on the left side. Further apart the images gets, the further in front of the screen it looks. Behind the screen the image for the right eye needs to be on the right side. If they over lap and look like one image it is the same distance as the screen. To do this you just keep the one eye from seeing the movie for the other eye. For shutter glasses the movie for the right eye flashes on screen when the right lens of the glasses opens, it shuts when the left eye movie flashes on screen. Going left right left right left right and so on. An inferred signal tells the glasses when to open and close lenses. For passive glasses the screen has a coating on it so all horizontal even numbered lines of pixels put out one light wave, all odd numbered lines sandwiched in between those give off a 2nd light wave. Then each lens of the glasses only lets one of the two light waves through. The two 2d movies are just sent to the correct lines. In the theater each movie passes through a filter in the projector to give them the correct light wave. Without a double filter in the projector or coating on the tv screen you can't do passive glasses 3d. Plus you can't do shutter glasses for the tv or projector without the extra hardware to sync the glasses with the switching between left and right eye movies on the screen. Plus they all have to do 2 movies at the same time instead of just one.

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3D TV, is a new technology that allows a 3D image display, HDTV on the other hand characterized by sharper image and colors, 3D TV has most of the HDTV specs plus the ability of 3D imaging.