Graphic LCD - Nokia 3310
Graphic LCD Display - 8 bits - Nokia 3310
Fig. 1 Graphic LCD Display
Description:
This board implements a graphic LCD display, taken from an old Nokia 3310 phone. It uses an 8 bits port, and the communication with the display is with a serial interface, similar to SPI, with some extra lines: reset, command/data select with the usual clock, data in and chip select. 5 lines are enough to manage the display.
Other types of display can be used, as long as they are compatible with the 3310 display.
2 leds are used to get a backlight on the display.
The display used has 84x38 pixels, but most 3310 types of display will be 84x48 pixels.
The board can be powered by 2.7 to 5V, the board has a basic regulator to suplly the display with 3.3V.
Specifications:
Input voltage 2.7 to 5V
Interface8 bits with processor
Display size84x38 pixels
Schematic:
C2 filters the supply voltage, C1 is used by the display charge pump. Each lines is then connected to a bit of an 8 bits bus.
A backlight circuit is based around R1, LED1 and 2. It also drives Q1 the transistor that limits the supply to the lcd display.
Depending on the led used, the voltage across one of them is around 1.6V. With 2, we get 3.2V. We add the base/emitter junction voltage, and we get a simple voltage regulator of around 3.8V. If you don't need a backlight, you can replace the 2 leds with a 2.7V zener diode, which will give you about 3.3V for the display.
C3 filters the power supply to the display itself.
Fig. 2 Graphic LCD Display Nokia 3310 schematic
Construction:
The PCB fits on a single sided board. All components are on the top side (copper side) except Q1.
Fig. 3 Graphic LCD Display Nokia 3310 layout
Start with the lowest components: C3 and the leds and the resistors. Continue with C1, C2 and Q1. Q1 is on the bottom side to make room for the display.
For the display, it depends on the pads. My display has 'spring' contacts. I positionned the display on the connecting pads, and kept it pressed down with some electrical tape. You can run a tutorial with the graphic LCD display to make sure it is positionned properly before securing it.
| Graphic LCD Display Component list |
|---|
| C1: 4.7 uF tantalum C2: 22 uF tantalum C3: 100 nF smd R1: 100 R2: 22 T1: BC547 or equivalent NPN LED1, LED2: green led smd LCD1: Nokia 3310 LCD display K1: Connector AMP MT 10pins male |
How to use / Testing:
To check the board, you need a processor board running the graphic LCD tutorial.
Files and links:
Eagle PCB and schematics files for graphic LCD display.PDFs of PCB, layout and schematics of graphic LCD display.
PIC Tutorials for graphic LCD display.
Philips PCD8544 graphic LCD controler.