31 Oct
2011
31 Oct
'11
8:11 p.m.
On 31 Oct 2011 at 22:17, Tony Duell wrote:
Multiplexing of LED displays was intially done, I
think, to save
connections. If you think of an 8-digit calculator display (with 7
segmets + a decimal point per digit), that's 64 LEDs, so 64
conenctions to the display (+ a common return). If you multiplex it,
that's 16 connetions, 8 for the segments (one for the top, one ofthe
top right vertical, etc) and 8 to select the digits (one per dgiti).
It still is the case. With microcontrollers, we also have
Charliplexing, further reducing the number of connections.
--Chuck