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'[EE]: hd44780 lcd contrast'
2003\09\02@144047 by Herbert Graf

> what is a common way to improve the contrast of surplus ascii lcd displays
> ? I have come up with a scheme that runs the display at a slightly higher
> voltage than the rest of the circuit. This works, but ... ? (these are
> displays that do not admit a negative Vee and work fine excepting for the
> contrast which is too low an an angle). I increase the display voltage by
> up to 0.8V. This does not interfere with logic levels (5V).

       Almost all modules I've encountered have a pin that adjusts the contrast,
are you saying yours doesn't or is that the pin your feeding this voltage
the contrast pin? TTYL

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