5 Oct
2006
5 Oct
'06
3:24 a.m.
I was thinking of individual LEDs and 8x8 matrix LEDs
but the driver
Ics for matrix LEDs are expensive and usually only drive 2 8x8 or, 4
5x7 matrix displays and they're not cheap,
I can't see why they'd be expensive. One 8-bit-wide PROM, eight driver
transistors, and an 8-to-1 demux would give you the ability to display
lots of symbols (as many as you can fit into the PROM, which depends on
how many address lines it has - eg, 12 address lines would support
2^(12-3)=512 different symbols).
Perhaps I just don't understand, but I can't see why it'd be any worse
to put it all on one chip....
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