Difference in how 720p and 1080p projectors produce 3D?


Standard Member
Im currently looking into 3D projectors and have read somewhere the 720p projectors only gives 60hz to each eye as it chops the 120hz in half to produce the 3D effect.

Do 1080p projectors work in that way to?

Many thanks.


Distinguished Member
There are a number of different projection techniques for 3D. In the cinema, they will use passive glasses technology relying on polarising the image differently for each eye. This makes the glasses cheap, but you need a metalized screen surface as a normal white screen will destroy the polarisation of the light.

For home 3D where the screen could be anything from a painted wall to a beaded screen, the active glasses technology with the images send sequentially is used. This is the same irrespective of resolution.

So yes, in answer to your question, you will get a maximum of 30 frames per second to each eye. Not a problem for films, as the frame rate will be 24 frames per second anyway, but sport and gaming can suffer from flicker. Better systems use a 3rd "step" between each eye, with both being blanked while the image changes. This decreases the flicker and ghosting effects and helps when viewing in high brightness.

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