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CCFL Back Light supply and Vee negative supply
http://forum.lcdinfo.com/viewtopic.php?f=6&t=1088		 Page 1 of 1
Author:  mesamune80 [ Fri Mar 04, 2005 3:34 ]
Post subject:  CCFL Back Light supply and Vee negative supply
Hi there,

I wonder whether i need to built a negative supply circuit up tp -17.5V(from data sheet) which is supplied to vee pin for the lcd module or is this same with the circuit which is also output a negative voltage (-14V) and this circuit is connected to CCFL two wires coming out from the LCD module.This because when i not using any extra negative supply circut i got no thing when power up the lcd ,the connection of V0 and Vee to a pot already well connected,i really cant see a thing or two.Someone please tell me what i suppose to do inorder for me to see something on my LCD module.Thanks!
Author:  mingingbollock [ Fri Mar 04, 2005 14:12 ]
Post subject: 
Well the datasheet would help us sort you out, but yes you will need negative voltage to drive the contrast (probably) , and if you have not got an onboard neg voltage generator , then you will either have to build one or buy one.
The CCFL inverter is totally different , and will not drive you neg voltage , its for the backlight . Sounds like you have the two mixed up somehow 8O , hope you have not killed it .
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