Driving a multiplex LCD

Discussion in 'General Electronics Chat' started by bill2009, Mar 19, 2010.

  1. bill2009

    Thread Starter Active Member

    Apr 17, 2009
    has anybody built a circuit to drive a multiplex LCD for example one salvaged from a clock?

    I would like to re-purpose some lcds (bike speedometers). They have 21 leads to the glass and I'm guessing they have 3 backplanes and < 40 segments.

    from what I can see I have to develop multiple voltage levels for the different backplanes and it's a bit daunting. Any suggestions gratefully accepted. Are there smallish general driver chips? Ultimately the data from the lcd will come over a 2 ft wire from another microcontroller.

    I'd be happy to buy fresh displays but this seems like a nice form factor and easy to waterproof for outdoor use.
  2. rjenkins

    AAC Fanatic!

    Nov 6, 2005