Re: monitors & video cards

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Wed, 30 Apr 1997 
>From: P3D Andrew Woods writes:
>.................. (I wrote:)
>> unless you interlace the signal
>> outside the computer, which some viewing systems do.
>
>I would be surprised if this is the case, do you have any further information?

******  I have read of several systems which use an outside *black box*
connected to the *video out* on the computer and the *video in* of the
monitor and which provides the drive signal to the glasses. I'm not sure
which systems actually use this method. I have no idea how current that
information may be. I would like to hear from Jonathon Gross about how the
Neotek system does it's thing. It may be this kind of external device....?
Is it interlaced, or page flipped?

>..........................
>I still contend that what a manufacturer means when they say that
>a monitor is "non-interlaced" is that the monitor has a high rating 
>for horizontal frequency.  After having a look around the web at the
>specs of various monitors I am yet to find one specifically advertised
>at being "non-interlaced" - does anyone have any examples?

*********  Well, about the time I was reading on the net about interlaced 3D
systems, I checked with my computer dealer and found out that 3D was headed
for a lot of trouble if it required the capability to interlace. All
monitors that this store stocks are clearly labeled in large letters on the
boxes they are shipped in as being NON-INTERLACED. It is felt in the
industry that a non-interlaced screen provides an overall higher quality
than an interlaced display. The preference is for faster vertical refresh
rates (vs. interlaced), primarily to reduce eye strain for general usage.
The big advantage for 3D is flicker free stereo.

Without knowing all the ins and outs technically it seems that a monitor
designed for non-interlaced signals *could* have problems providing
interlaced dispalys in the normal sense of interlacing. There is no problem
putting an interlaced image on the screen. The problem is getting the scan
to visit alternate scan lines instead of sequential ones. It is totally
plausible that the newer monitors could be somewhat unfriendly to efforts to
interlace. It's also possible that the prominent use of the term
NON-INTERLACED on the packaging is intended only to signify image quality,
rather than anything else.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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