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Video Resolution WAS:HMD cheaper than eyetop

> On Mon, Jul 21, 2003 at 05:31:41PM -0500,  wrote:
> > i own a glasstron a35 that is ntsc and converted into a 
> monocular (and 
> > paid alot less than that vr1...with similar specs, i found one with 
> > damaged audio on ebay and paid 175 us) which i run at 800x600 with 
> > extra large fonts and i think it looks pretty good!
> 
> Ummm, that's impossible.  NTSC resolution is 320x200, IIRC.
> 
> It might be converting it on the way to the device, but 
> either it's not 800x600 or it's not NTSC resolution.

There is not one NTSC format.  There are many formats due to the diverse
media on which Video is distributed.  Two of the most common formats
are:

Full CCIR-601: 720 x 576 (480 TV lines).  
CIF-601: 352x288 (240 TV lines).

Looking at Harley's configuration, the VGA to NTSC converter will
probably spit out one of these 2 formats.  But here is the kicker, the
panels in the A35 are 180K DOT panels.  800x225 dots translate into
60,000 individually addressable full color pixels (266x225). So, the
800x600 SVGA image is being down converted into either 720x576 or
352x228 NTSC video by the converter and then is being further down
converted into 266x225 by the panel electronics. The effect is a
whopping 87.5% decrease in resolution, yet the image "still looks pretty
good".

It's hard to qualify what resolution is best.  It comes down to what
resolution is best for you and your application.  In most cases, the
decision is made solely on display format number - more is better.  As
Harley has shown, the display format has little to do with the end user
experience.  The display chosen was right for the user and application
regardless of the seemingly lacking resolution.

-Tony

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