Powertip displaycontrast adjustment voltage: Help

[Bruce Varley]

Hi, I'm setting up a Powertip PC-4002B LCD display (40 char x 2 lines). The
datasheet has everything required except what to do with the contrast
adjustment voltage (VO). Can anyone assist? TIA

 

[Andy Wood]

"Bruce Varley" <bxvarley@weastnet.com.au> wrote:

Hi, I'm setting up a Powertip PC-4002B LCD display (40 char x 2 lines). The
datasheet has everything required except what to do with the contrast
adjustment voltage (VO). Can anyone assist? TIA

Most of the LCD modules are pretty much the same. If you are running
it on 5V a 10K pot across the supply will probably do the trick. Some
of the modules will run on 3.3V or a bit less but to run like that you
may need to be able to take VO negative. Usually the specs don't list
VO directly, but as VDD-VO (from what I have seen, in the range about
3.5V to 5.0V depending on the temperature).

Andy Wood
woodag@trap.ozemail.com.au