Re: Color CRTs, dot pitch, resolution and the like...

Clay, that sounds correct. It's possible they pushed the pixels to the
next resolution of 1024 pixels
horizontally, since that's the next increment, but I question whether
they could reach the vertical of
768. Additionally, if they are being literal in their description of
the monitor, it maxes out at
800x600, since by definition VGA = 640x480 and SVGA = 800x600.
XGA=1024x768.
Admittedly, a lot of manufacturers fudged on the 1024x768 over the years
and called it SVGA
too.

I know the standard dot pitch for 1024x768 monitors is 0.28 or better
and has been for many,
many years (computer monitors).

Scott C.

Clay Cowgill wrote:
> Hey all,
>
> Time to play: check my math (and theory)...
>
> I was pondering the VGA/SVGA Vision Pro monitors that Happ sells (they're on
> sale now, BTW-- $200 a whack if anyone wanted one to experiment with).
>
> The "dot pitch" is advertised as 0.78mm. According to Google, that makes
> for about 0.030708 inches.
>
> If we assume a full 19" of the CRT is visible area (not likely) and the
> aspect ratio is 4:3, that would make for a display area about 15.25" x 11.5"
>
> So if the 'dot pitch' was arranged as a rectangular grid of 0.030" blocks...
> 15.25 / 0.030 = ~508 pixels. Since the dot pitch is a diagonal measurement
> and since the triads are arranged in a sorta tessellated pattern, I'd
> guestimate that the 'effective' resolution would be about double-- so around
> ~1000 pixels horizontal?
>
> (That kinda passes the sniff test since the tube is spec'd for 800x600 pixel
> resolution and with a smaller actual visible area than this example you'd
> probably be guaranteed to hit a couple triads with even the smallest pixel @
> 800x600 with standard sync/clock rates.)
>
> This sound about right to anyone else? (I was just thinking that even if
> using one of these 'high res' "SVGA" tubes, the active area of the CRT could
> be resolved with 10 bits of DAC in a vector output stage if you don't need
> overscan. You'd not see any loss of 'resolution' since the dot pitch of the
> monitor is the limiting factor...)
>
> -Clay
>
>
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Received on Thu Apr 19 08:24:32 2007