Eric LaForest wrote:
>
> Sure..but note that the main difference between what I want to build and
> what I have seen out there is that all the displays I have seen are of the
> vector graphics type while I want to do raster-scan graphics like a real CRT.
> I would lose on the resolution side, but it would do some things a vector
> display cannot.
>
> --
> Eric LaForest Nascent Linux Borg -www.ncf.carleton.ca/~di458-
> #define Hacker !(Cracker) //FYI: http://sagan.earthspace.net/~esr/
> Breaking into computers does not make one a hacker, for the same reasons
> that hotwiring cars does not make one a mechanic... paraphr. from ESR
I've been thinking; Why not use one first-surface, continuously spun,
octagonal mirror (available with laser source for cheap often enough!)
to do the horizontal scanning, a second mirror on a stepper motor or
voicecoil to do the vertical traces, and a third mirror or even a very
small "blocking" object to do On/Off, (if you cannot find a laser
that'll do instant on/off), on a voicecoil or perhaps even on a Piezo
actuator? (Just a raw idea so far, need to play with it <G>) If you
had the light go through the path:
laser -> octagonal mirror -> pixelizer mirror -> stepped mirror ->
slit -> screen
(or even put the "pixelizer" even earlier, in the scanner?) the
pixelizer (on/off mirror) wouldn't have to move much, just enough to
make the beam miss the slit, to make a "off" pixel.
Then the whole thing devolves to a fairly simple 17Cxxx PIC project;
One (Hall Effect?) sensor for octagonal mirror timing, one power feed to
the stepper motor, and a power feed to the pixelizer. I'd think it's
do-able, possibly even on a 16F84 cheaper processor (Doubt a Basic Stamp
would do it?):
Turn pixelizer ON
Power up, wait until speeds are constant
Wait for octagonal mirror "start of horizontal scan"
If we're on a scan line, put that scan line out;
If not, calculate a scan line or two.
Step the vertical deflection mirror to the next scan line
.
(Rough draft <G>)
Mark, 
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