P3D Re: optics of stereo viewers

[michaelk@xxxxxxxxxxxxxxxxxx (Michael Kersenbrock)]

> needed to support the grill:  It makes a very visible horizontal line right
> across 
> the screen!  The first time I saw this I was convinced the monitor was
> defective
> until someone explained it to me, at which point I just wondered why anyone
> would buy such a monitor.  In truth, I later bought one myself, for the
> reasons

And after using it for a while you don't notice it at all unless it's mentioned
(like by you right now) and one *looks* for it.  :-)

> stated above.  Finally, I don't know how a "single gun" color CRT works, but
> it seems pretty unlikely, if not outright impossible.  I think what they mean
> is
> that the three electron emitters are fabricated as a more-or-less single
> piece,
> in the hope of getting tighter tolerances on the positioning.  It may be so,
> but I
> still contend that a standard triad shadow mask (of equivalent aperture
> dimensions)
> gives a shaper image.

The trinitron has a single electron gun rather than three, and was another
reason for desirablity.  The one gun doesn't have inter-gun alignment problems 
over time (or at the beginning).  I don't recall the details of how it works 
although I recall thinking it quite clever a long time ago when I did read
about it.  So purity due to practical manufacturing-time and long-term
alignment might be better all other things being equal (which it isn't always).

Personally, I've liked trinitron screens because the seem sharper than other
types.  May just be that Sony's were higher priced and better for bandwidth
or other design reasons, and they happened to use Trinitrons, or perhaps that
having greater brightness (with less blooming) *is* significant.  

Now that the basic patients for the Trinitron has expired, others are now
using the design (without using the "trinitron" trademark of course) so
there must be reasons to do so -- I'm sure it costed'em a good bit to 
start up a new technology line of CRT's.

Mike K.

> 
> Greg M.
> 
> 


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End of PHOTO-3D Digest 2508
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