Last year, I was looking for a display to show different information on my home theather computer.
I wanted a display to fit in a 5" 1/4 bay and no LCD technology as I don't want backlight that lights all my room when I watch a movie (high contrast required).
Then I discovered the 3.2" monochrome OLED display ER-OLEDM032 based on SSD1322 chip. Support in Aida64 was implemented by Fiery.
It looks great! Infinite contrast of OLED technology is perfect.
4 different models exist for 4 different colours.
White (what I chose):
4 protocols are available. Protocol to be used is set using bridges on the display PCB.
6800 8-bit parallel
8080 8-bit parallel
3 wires SPI
4 wires SPI
6800 and 8080 are obsolete as we don't use anymore parallel port. I chose 4 wires SPI rather than 3 wires SPI because communication speed is a bit higher.
To convert USB to 4 wires SPI, I used a FTDI UM232H-B-WE breakout module based on chip FT232H.
Here is the schematic of connections between USB breakout module and OLED display: