DC to AC LCD Circuit

Discussion in 'General Electronics Chat' started by elementalrage, Jul 8, 2013.

  1. elementalrage

    Thread Starter Active Member

    Jul 30, 2009
    59
    3
    Hey guys,

    I have a 5 volt DC circuit, with a PIC chip and want to run a small numeric LCD display. The LCD display needs 5 volts AC.

    This is what I am wanting to use :: http://lumex.com/products/detail/1362

    Would a simple PWM at 30 or 60 Hz work?

    I have googled it and came up with nothing.

    Anyone have a schematic of a circuit that I can use?

    Also, does anyone have any idea what king of amperage these LCDs pull? I know it isn't very much.

    Thanks!
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    These need an AC drive with a DC component of zero. You can make this in any micro by using pins to make 50% square waves.

    There is one (or more) common planes, and a segment for each display element. Drives these in phase for off, out of phase for dark,

    50% means 50.00000%. 49.9/50.1% will eventually destroy the liquid.

    They draw minute bits of power. Ignore it. That's why cheap watches use LCD's.
     
    #12 and elementalrage like this.
  3. elementalrage

    Thread Starter Active Member

    Jul 30, 2009
    59
    3
    Great info. Thanks, Ernie!
     
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