Extended Display Identification Data

Extended Display Identification Data ( EDID ) is a 128-byte data structure that a display uses to describe its capabilities. It contains information such as the manufacturer, date of manufacture, display size, pixel mapping data (only for pure digital panels), etc.

The I²C bus is usually used to transfer the data structure from the monitor to the graphics card .

The combination of EDID and I²C is called Display Data Channel Version 2 ( DDC2 ). The “ 2 ” indicates that DDC2 is different from VESA's original DDC (they use a different serial format).

The EDID data structure is normally stored in a serial PROM or EEPROM built into the display and can be read from there via I²C (even if the monitor is not switched on, because the PROM / EEPROM is supplied with power from the computer, not the power supply unit of the monitor).

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