Realism is the key to successful animatronics and robotics, and enthusiasts have demonstrated excellent examples of their efforts - such as the following eyeball display by marcwolf.org. They have embedded a Freetronics OLED display inside a plastic sphere with a clear section that acts allow the image to be seen.
Finally, the OLED is controlled by a high-performance Arduino-compatible board that allows for an excellent frame rate on the OLED - and thus a realistic eye complete with pupil dilation and other effects.
If you're looking for a neat and colourful display to use with your Arduino or Raspberry Pi - consider our 128x128 pixel OLED Module. With a diagonal size of 1.5" and 16,384 colours to select from, so almost anything is possible. Furthermore there's a microSD card socket, and removable tabs on each side which can hold LEDs and buttons:
And using the module is made simple - we have tutorials and drivers for both the Arduino and Raspberry Pi platforms - great for experimenters or those who use both systems. Furthermore, check out the forum where members are already creating modified drivers to rapidly increase the display speed. For more information including our Quickstart guides - and of course to order - visit the OLED Module product page.