Re: Sky to launch the UK's first 3D TV channel

"Charles Ellson" <charles@xxxxxxxxxxxxxxxxxx> wrote in message
news:7pe475pd1uvdsas2ofa9356dovr9r2kena@xxxxxxxxxx
According to :-
http://www.electricpig.co.uk/2009/06/18/lg-3d-tv-on-sale-next-month/
"You'll need special specs to watch the LG 3D TV,.." so there seems to
be some snake oil involved.

I skimmed over that page, and the page it linked to for the review, but
nowhere did it say this is the system that Sky is using. There are a number
of 3D technologies about to hit the TV market (*sigh* Beta/VHS and BluRay /
HD-DVD wars again).

The three that stand out are:

* Lentricular lenses - put simply this means the TV has lots of tiny tubes
in front of the screen that direct half of the pixels at one eye, and half
at the other, thus giving you a stereo image. I doubt these will sell well
because you have to be sat upright (so no relaxing laying down on the sofa)
and in set positions, heights, and distances from the TV. The point of this
is that you don't need special glasses.

* Shutter glasses - one lens of the glasses goes opaque (the other remains
transparent) while the TV displays an image for one eye, then the lenses
swap round and the TV displays the image for the other eye. This happens
very fast (25 or 50 times per second). The downside of this is heavy special
glasses with batteries in them, and migraine inducing flicker. This is the
type described on the page that you linked above.

* Polarised pixel rows - I understood this was what Sky was going to use,
but I could be wrong. What happens here is that the even rows of pixels
shine through a horizontally polarised material, and the odd rows through
vertical polarised material (or the other way around, whatever). You then
wear special lightweight glasses, where one lens is horizontally polarised
and the other vertically. Thus, you only see the odd rows of pixels through
one eye, and the even rows through the other. The problem with this is that
no affordable polarisation technique is 100% opaque in the opposing plane.
As such, through a given lens, you get a minor "ghost image" of what is
being displayed for your other eye. There are variations on this such as
spinning circularly polarized lenses...

Interestingly, the first and last of those methods are compatible with each
other from a broadcast perspective. The Lentricular lens can be created to
point alternating rows of pixels at each of your eyes respectively. So if
Sky chose this method then TVs made with Lentricular lenses *could* be made
to be compatible. Really, the broadcast format needs to be set in stone
beforehand for this to happen, but I'd imagine the TV manufacturers are the
ones dictating that.

--
Vincent


.

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