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On Wed, May 30, 2007 at 11:07:04AM -0400, Timothy J. Weber wrote:
> > It's an interesting idea... but it could add a lot of complexity. One of
> > the more "interesting" things about the displays I'm using, the
> > ChLCD "electronic paper" displays from Kent Displays, is that they are
> > very pressure sensitive. If you touch them at all they leave a ugly
> > visible mark that won't go away until you do an electronic clear.
> 
> Very cool modules!  How much do they cost?

Rather cheap actually, $100 for 320x240 with a SPI interface. Nice guys
to deal with, *very* honest about what their product can and can't do.

I've got code to interface them with a 16f819 if anyone is interested.

> And you would hope the display wasn't flexed somehow while the resin was 
> cooling?  Or would that be corrected once it started running?

Yes, it would be corrected when the device is activated by the
electronic erase command. I also initialize the screen to a checkerboard
pattern. Residual stress may still be a problem though.

> > Not to say it isn't doable, but it's a lot more work, and then I have to
> > worry about stuff like bonding the polyester resin to the acrylic making
> > up the rest of the enclosure.
> 
> What about a clear oil or petroleum jelly instead of glue?  Get the 
> mechanical placement using something else?

Hmm... Sounds messy... I mean, what happens if the user leaves the
device in hot sunlight? After all, the whole point of the device is that
it's light sensitive...

> I mean, silica gel might just be sufficient and is much simpler.  And if 
> it's completely sealed, you'd think the gel would absorb the water and 
> then you'd be done.

Exactly my thoughts. Othere people hermetically seal stuff that way too
so it's proven as well.

- -- 
http://petertodd.ca
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