[mythtv-users] OT: Buying a new TV - Sharp Quattron or 3D?
J.Pilk at tesco.net
Wed Jun 8 10:56:26 UTC 2011
On 07/06/11 17:31, Raymond Wagner wrote:
> On 06/07/11 11:32, Neil Cooper wrote:
>> The disadvantage with polarized glasses over shutter glasses is that the both L&R eye images are in the same frame. This means you don't get flicker but each eye only gets to see half as many pixels, meaning your HD content (1080) becomes only 540 pixels, which is hardly more than standard definition TV (480).
> That may be true for flat panel, but any form of projection display is
> going to have two independent polarized projections at full resolution.
>> The other advantage of shutter is that polarized glasses are a lot more susceptible to viewing angle issues.
> Except shutter glasses ARE polarized glasses. They're nothing more than
> tiny LCD screens. Your LCD screen works by having two polarized
> filters, one static, one dynamic. Light passes through the static
> filter and becomes polarized. The dynamic filter can adjust plane, and
> depending on the angle, determines how much light comes through.
> With passive glasses, you have two linear filters at perpendicular
> angles. Each will only allow the in-plane light through. With active
> glasses, you have a static filter, which must be in the same plane as
> that in the TV, and another dynamic filter which flips between the two
> maximums to allow or block light. So, any deficiencies that may exist
> with passive glasses MUST exist with active glasses.
I wasn't and still am not familiar with the technology but had some
difficulty with this explanation. This looks a helpful and reasonably
up-to-date summary. It appears that the passive system uses circular
polarization - and halves the spatial resolution, as already mentioned.
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