There are five types of display interface type each with their own advantages. They are ASI-V2, VT100, VT100-a, DUAL and I2C for an explanation of the differences see "Display Interface Types" in the information box for more details on what the differences are. All the controllers are designed to fit on the back of the display and come with the necessary connector pins. To purchase the display with a controller, go to the displays section, click on the required display and select the controller from the drop down box.