try to use ICL7660 chip from intersil, with it you will have a -5 volt from +5 volt.
put a pot between +5 and -5 and adjust your lcd with it.

Onil


Jose wrote:

> Hi,
>
> I got a LCD display, it is a extended temperature range one, so it needs to have a polarization  VCC-VEE > 7,5 V (VEE is the drive voltage of the LCD). At this moment i am operating it with VEE = - 3V, I am using a Source that gives + 5 , GND, - 5. Is there a way to make this kind of LCD to work with a single power suply?. Is possible to use a 555, someone has tried it??
>
> Thanks
>
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