"Gary" wrote in message
news:6HZ_n.180653$m87.37557@hurricane...
I wonder why there aren't any after market 3D TV converters.
Surly any 1080P TV could display in HD 2 images sequentially and a
transmitter like the Sony one would work. with any TV. It could be added
to the HDMI line in and possibly need a knob on it to adjust the sync when
first installed.

I guess the problem is that it's a 50 Hz refresh rate on the HDMI input.
Even if the TV uses a much faster refresh internally, an external converter
can't access the video path at that stage. So you're stuck with 50 Hz which
would have to be halved to 25 Hz for each eye. That would mean intolerable
flicker and probably give people epileptic fits.

Another possibility for might be a 3D converter for "side by side" 3D, with
special prismatic glasses that made your field of view converge without you
having to cross your eyes yourself. You would have to sit twice as close to
the screen, half the screen area would be wasted, and the resolution would
reduce to SD. But it would work, and it could be cheap.

The prism glasses would have to be carefully designed for a specific viewing
distance so as not to cross your vision too much, and be supplied with dire
warnings not to attempt to walk or do any other activity other than watching
3DTV while wearing them.

(You can produce a similar effect with one of those fresnel sheet magnifiers
from a stationery shop if you hold it right in front of your face.)