It included the EDID 1.0 format and specified DDC1, DDC2B and DDC2Ab physical links.ĭDC version 2, introduced in April 1996, split EDID into a separate standard and introduced the DDC2B+ protocol.ĭDC version 3, December 1997, introduced the DDC2Bi protocol and support for VESA Plug and Display and Flat Panel Display Interface on separate device addresses, requiring them to comply with EDID 2.0. The first version of the DDC standard was adopted in August 1994. The most current version is Enhanced EDID (E-EDID) Release A, v2.0. The format uses a description block containing 128 bytes of data, with optional extension blocks to provide additional information. The DDC suite of standards aims to provide Plug and Play and DPMS power management experiences for computer displays.ĭDC1 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.Įxtended 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 standard was created by the Video Electronics Standards Association (VESA). Like modern analog VGA connectors, the DVI and DisplayPort connectors include pins for DDC, but DisplayPort only supports DDC within its optional Dual-Mode DP ( DP++) feature in DVI/HDMI mode. The Display Data Channel, or DDC, is a collection of protocols for digital communication between a computer display and a graphics adapter that enable the display to communicate its supported display modes to the adapter and that enable the computer host to adjust monitor parameters, such as brightness and contrast. ( August 2022) ( Learn how and when to remove this template message) Several templates and tools are available to assist in formatting, such as Reflinks ( documentation), reFill ( documentation) and Citation bot ( documentation).
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