68HC705V12

[Ross Forgione]

May I put my hand up as well to receive the info re you r dash panel.

Much Abliged,

ross at apdata.com.au

> 
> In a message dated 97-04-12 12:19:33 EDT, you write:
> 
> > Does anyone know if a colour graphics LCD would be too slow for updating,
> >  the ones I've worked with you could see when rewriting the display (don't
> >  know if that was due to software overhead though) ?
> 
> Yes, lets try this again.  I'll add you to the list, anyone else interested
> email me directly for the schematic :)
> 
> Yes, LCD displays tend to be much slower than a picture-tube style display,
> however they draw less power, generally have the high-voltage generator
> that's required built in, especially if using a production model, rather than
> designing your own.  LCD displays are slow due to physical limitations of the
> material used, not because of the video display electronics (though most of
> the time PC video circuits for LCD panels are slow simply because they don't
> *have* to be smoking fast because the panel is slow.
> 
> If you update the display every 1/2 second or every second, as most vehicle
> digital dashes are, they are more than fast enough.  What ruins LED and LCD
> displays for automotive use is brightness and sunshine.  The solution for
> that is privacy glass, glass that allows only the person sitting immediately
> in front of the display to be able to see it.  This type of product is about
> $75US and is typically used for accountants working on high-secret numbers in
> corporate america, though they can be used anywhere.  Its not safety glass
> generally, so scoring and cutting it to the right size is fairly easy.  This
> will prevent sunshine coming in through the windows getting into the display,
> and reflecting back into the driver's eyes making the display hard to read.
>  I tested this with my color Compaq notebook, and it works EXCELLENT.  So,
> automotive application will be fine.
> 
> LCD's other inherent problem is going to be temperature.  Anything below
> freezing is a no-no for LCD displays, as the crystals won't move, rotate, or
> change color (however it works) in the cold, my Notebook has proven this in
> the winter, after leaving it in my vehicle trunk overnight.  The solution is
> to warn the display with either electrically heated warm air, or create a
> heated glass plate and place it over the LCD display, heating it when the
> temperature is low, *THEN* applying power.  Picture tubes would prevent this
> I believe, however I'd worry about tube implosion in an accident.
> 
> Frederic Breitwieser
> http://members.aol.com/fjb203/index.htm
> Bridgeport Connecticut
> Homebrew Automotive Mailing List
> 
> 
> 
>