These are inexpensive LCD modules originally designed for mobile phones but now available on PCBs for general purpose usage.
The controller on the device is a Philips PCD8544.
There are at least three varieties of LCD board, my example uses this pinout.
Pin | Name | Function |
---|---|---|
8 | LED | Back light |
7 | SCLK | Serial clock |
6 | DN<MOSI> | Serial data |
5 | D/C | Data/command |
4 | RST | Reset |
3 | SCE | Chip enable |
2 | GND | Ground |
1 | VCC | 3V3 power |