Inexpensive OLED displays with I2C interfaces abound, but there is a catch: they tend to be stuck on I2C address 0x3C. Some have a jumper or solder pads to select an alternate (usually 0x3D), but t… ...

I2C displays rarely ever need ... so it’s definitely worth considering if you can spare the pins. The bigger displays even have ... (Used in the OLED displays) has not only SPI and I2C, ...

"It's a bare OLED display with a 30-pin FPC (I2C), which I got from my trusted display supplier." Each key's display can change depending on context.