Thanks for you r info. I will try to hook it up and let you know how it came out .I know it works cause I pulled it from a hospital bed that broke down it,moniterd the bed's adj. and batt. life. I want to use it for my mp3 jukebox and movie server.
Do you know of a good program to use with this? Thanks for your help,EREK
The wiring diagram shows VEE (which is usually the negative voltage output for the module) is on pin 8, so your negative voltage is on board, but it is definitely missing an LCD controller, so you'll want to go back and scavenge the controller from the electronics you got the display from.
With Crystalfontz modules and many other that should be correct but I don't think there's negative supply on board in this module.
Instead there are two negative voltage inputs. For VEE you need to supply a constant negative voltage and for VADJ an adjustable voltage for the contrast adjustment. There is an example power supply connection in section 4.2 of the datasheet.
I believe there's something missing from the datasheet in the section 2.2 DC characteristics table. There are just empty spots for the Supply Voltage (LCD Drive) Vcc-Vee minimum and maximum values. In the absolute maximum section it is saying that Vcc-Vee Max. is 35V.
My guess is that for the Vcc-Vee Min. 27V would be a good value. With Vcc of 5V that would mean that Vee should be -22V. I have used -24V with success.
As in the LCD Driving Voltage table typical Vcc-Vadj value shown is 23.3V a -22 to -24V VEE should give plenty of room for contrast adjustment.
You should find also the negative voltage supply somewhere from the electronics of the equipment where the lcd is from.
So in other word this thing is junk with out a controler? But it looks like the controler is on the back of the lcd!?!
If some one could tel me how to post a pic on the forum I will to get a better understanding of it.
Thanks for u guys help,EREK