Nokia 5110 LCD is low-cost, monochrome LCD with 84x48 display. It is popular for 8-bit AVR/PIC projects, search google for 'Nokia 5510 LCD', and you will find lots of resources.

Features:
Built-in Backlight
Easy communication with common MCU control
Philips PCD8544 LCD controller with SPI interface
Graphic LCD module with 84x84 pixel resolution
Compatible with Nokia 5100,3310 LCD

Specifications:
Interface: SPI serial connection
Operating voltage: 2.7V to 3.3V
Operating current: <5mA (Backlight off), <20mA (Backlight on)
Operating temperature: 0°C to 50°C
Storage temperature: -10°C to 70°C
Size: 45x45x5mm
LCD controller: Philips PCD8544

Pin Assignment:
VCC:2.7 to 3.3V
GND:Ground
SCE:Chip enable (Active Low)
RES:Reset (Activ Low)
D/C:Data/Command selection, Low-Write command, High-Write data
SDIN:Serial input
SCLK:Clock input
LED:Active High 2.7 to 3.2V