LCD 4x20 HD44780

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  1. - 1st April 2006, 13:47 #11
    paul borgmeier's Avatar
    paul borgmeier
    paul borgmeier is offline Senior Member
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    snip ....
    The contrast, indeed need negative voltage of up to -5.7 vdc with relative
    to 0/gnd. Whereas the Vdd remain at 5.1 Vdc.

    The LCD is made by OPTREX model DMC20481.
    ... end snip

    Wow - something is not right because my DMC20481 uses a + voltage for contrast. See the attached snippets from my DMC20481 datasheet.

    Thoughts?

    Paul Borgmeier
    Salt Lake City, Utah
    USA
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