I am trying to learn about multiplexed displays (I thought it was about 
time I  had a go at this) and I believe that I understand the basics - in 
as much as it requires the switching of the required anode as well as the 
required cathode (all of which are wired in parallel).

I understand that I can use something as simple as a single transistor for 
the cathode (low side) and a couple of transistors for the anode (high 
side).

Again, for the low side driver I could use any of the 'standard' shift 
register type drivers that we use in clocks such as an HV5622 (I appreciate 
that's way too many bits and I'm sure that there will be a smaller 
equivalent part available.

Specifically - is there such a part that I could use for the high side, ie 
switching the HV to the relevant anode?

I know that I could use a simple shift register (74595 for example) plus 
the transistors for  a high side switch, I just wonder if there is a part 
which does all that in one package?

All pointers gleefully received.

- Richard


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