Re: Where to find LCM / system design info?
- From: Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 17 Jul 2005 17:36:45 GMT
Hello Spehro,
IOW you can't really use an ordinary micro controller with a cheap graphics LCD? I mean a low pixel version like the OP suggested.
Required bit rates to serial drivers are pretty high, and there are
tight timing constraints. Say the refresh rate is 60Hz and there are
256 x 128 dots.. that's 2MHz/500KHz for bit/nibble-serial plus more
bandwidth for the row driver data). And 4K bytes of RAM, minimum,
which is more than most cheap micros have on board, total. In the
standard T6963 configuration, it takes 8 LSI chips to drive a 64 x 320
monochrome graphic display-- 4 T6A39 column drivers, 1 T6A40 row
driver, two SRAM chips and the controller itself.
That is unfortunate especially since most applications do not require a fast change of the displayed information. I may have an application coming up where a small low-res display would be just the ticket. But only if an ordinary (meaning cheap) uC can handle it on the side. The LCD wouldn't have to do much more than an etch-a-sketch, and about at that speed.
The driver in firmware is no easy feat but the number of available pins on a micro seems to be the limiting factor w/o an LCD controller if I understood you correctly.
Serial (more or less) so the pin count is probably not an issue unless
you need a load of pins to interface to external RAM.
But aren't you back to the expensive kind of LCD with a controller that can take serial data?
I wonder if there is a toy game, maybe yahtzee or a watch, that is really cheap and offers a way to send data to its LCD. Then the parts list of a new unit might contain a part with a Walmart P/N ;-)
Sometimes it is amazing how cheap things get. There was a radio with ear phones and all recently. It even had an FM synthesizer. Sold for 99c and you could buy unlimited qties. The RF performance was lousy though.
Regards, Joerg
http://www.analogconsultants.com .
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