The SparkFun Micro OLED Breakout Board breaks out a small monochrome, blue-on-black OLED. This breakout is perfect for adding graphics to your next Arduino project. The Micro OLED is easy to control over the I2C interface. The screen is 64 pixels wide and 48 pixels tall, measuring 0.66" (17mm) across.
The specifications are available on the website of Sparkfun.