The document is Application Note AVR340: Direct Driving of LCD Using General Purpose IO
http://www.atmel.com/Images/doc8103.pdf
The example uses an ATmega48 and the Pacific Display PD-332 Multiplexed 3 1/2 Digit Liquid Crystal Display.
"The LCD described within is Glass-only device (no interface IC on the LCD). The LCD has 4 COM inputs and 8 segment inputs, requiring 12 I/Os on the ATmega48. There are 11 to 16 additional I/Os still available on the ATmega48, depending on the package chosen."