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Can I use the -12v to give the LCD -8v using a pot ?
All i need is pot ? which one ?

Y r u guyz using all the other options to give the -8v if this is possible and most simple... ?

Yes you can use that. 10 Kohm potentiometer should work and no other parts are needed. Connect one end of the potentiometer to -12v and other end to GND. Middle pin will then be the variable output.

I don't know for others but the reason I'm using inverter circuits is that I don't feel comfortable modifying the ATX power connector for this purpose. There's nothing wrong doing it that way but it's just not the way I do it. I also like the fact that I can power the display using just one +5v line.

Also some of my displays have internal negative voltage converter and pot, some have negative voltage but need external pot and some don't have any negative voltage generator at all.