Display Data Channel: Difference between revisions

Revision as of 16:29, 4 September 2024

Revision as of 18:58, 29 March 2025

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DDC1 and DDC2B/Ab/B+/Bi protocols are a physical link between a monitor and a video card, which was originally carried on either two or three pins in a 15-pin analog [[VGA connector]].

[[Extended display identification data]] (EDID) is a companion standard; it defines a compact [[binary file]] format describing the monitor's capabilities and supported graphics modes, stored in a [[read-only memory]] ([[EEPROM]]) chip programmed by the manufacturer of the monitor. The format uses a description block containing 128 bytes of data, with optional extension blocks to provide additional information. The most current version is ''Enhanced EDID (E-EDID) Release A, v2.0''. [[DisplayID]] is aimaimed to replace EDID, which supports many features such as [[High dynamic range|HDR]] and [[color management]].

The first version of the DDC standard was adopted in August 1994. It included the EDID 1.0 format and specified DDC1, DDC2B and DDC2Ab physical links.