3 wires interface for LCD display
This is a cheap alternative to serial LCDs. This post is based in the work made previously by tomek in wiring LCD displays using 4 bits. The basic idea is to group the 7 pins that are needed to drive the LCD in only 3 using a shift register.
   3 wires interface for LCD display
Check out 3 wires interface for LCD display website
www.arduino.cc