Guide What is DDC/CI and what is E-DDC?
DDC CI stands for Display Data Channel Command Interface and is an updated version of the original DDC spec.
E-DDC stands for Enhanced Display Data Channel and is the most recent version of the DDC spec.
The different DDC variants are all used to send addition metadata and control signals over a video cable.
Early version of the DDC spec simply trasmitted basic information about the display, such as name and supported resolutions to the connected PC or laptop.
The DDC/CI variant, ratified in 1998 added the ability to remotely control the display from the source device, typically a PC, laptop or set top box. Most of the standard controls were primarily defined around image, color and geometry adjustment.
DDC, which is primarily designed for computer monitors, should not be confused with HDMI CEC which primarily designed for TVs.