LCD TEMPERATURE COMPENSATION

[Blubb]

Hallo,

i have a Character Display 4 x 20 - 20 ° +85 °
with a Voltage DOUBLER on board.

i need a shematic for temperature compensation
for the Contrast of the Display
the voltage range is 0 V till 5V

Can somebody help me

 

[digidot]

Hi

The negative oltage generator on board the lcd is used to supply a negative bias for the contrast. The one side of the contrast pot is connected to Vdd the other side to Vee (the negative voltage generator) and the wiper of the pot is connected to Vo.

Checkout the POWERTIP website for this info.

All extended temperature range lcd's need a negative voltage to adjust the contrast.

rgds
Ian

 

[Phytex]

If you understand german you have a look in "Halbleiter-Schaltungstechnik" Autor: Tietze/Schenk. They give some applications for temperatur compensation!

Phytex