ViewSonic EDID Editor

Extended display identification data (EDID) is a data structure provided by a computer display to describe its capabilities to a graphics card.

It is what enables a modern personal computer to know what kind of monitor is connected. EDID is defined by a standard published by the Video Electronics Standards Association (VESA). The EDID includes manufacturer name, product type, phosphor or filter type, timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data.