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Xorg Developer’s Conference, Feb 8, 2007
Abstract
EDID (Extended Display Identification Data) Standard defines data
formats to carry configuration information about display devices.
It became E-EDID (Enhanced Extended Display Identification Data)
in 1999 when extension blocks were added. For this presentation,
we will refer to EDID to mean E-EDID or EDID.
This is overview of display technologies and EDID with respect to
display devices will be given. EDID is needed as the primary
identification mechanism with regard to displays for computer
systems and any device which sends information to displays since
about 1996. Yet EDID is diverse, with multiple parts. It is changing
rapidly and has many associated VESA standards. EDID 1.4 has
just been introduced. A review of those standards will be presented.
Xorg Developer’s Conference, Feb 8, 2007
Display Technologies
•
Primary Display Technologies in Use today
✦
CRT’s
✦
LCD’s
✦
Plasmas
✦
Projectors
➡
Front Projectors, which fill a screen from a distant point
➡
Rear Projectors, which are in self-contained enclosures
๏
DLP (Digital Light Projects), based on TI’s DMM technology
๏
LCOS (Liquid-Crystal on Silicon)
๏
AM-LCD (Amorphous Silicon LCD)
๏
Poly-LCD (Polysilicon LCD)
✦
All use EDID to communicate their resolution capability
Xorg Developer’s Conference, Feb 8, 2007
Displays and Scalers
•
Most fixed-pixel array displays have scalers
➡
Convert incoming timings into the display’s native timing
➡
May have all of the EDID recommended base timings
•
Newer and higher resolution displays have no pure scalers
✦
e.g. 30-in LCD monitors at 2560x1600
➡
Accept single resolutions, or direct divisions, such as 1280x800
✦
Scalers tend to top out at 1920x1200
➡
approximately the highest level of HDTV, or 1920x1080
✦
EDID becomes critical for a graphics card to know how to drive such
displays
Xorg Developer’s Conference, Feb 8, 2007
Most Common Display Interfaces
Interface
Analog/
Digital
Connector
Date
VGA
(D-Sub,
HD-15)
Analog
1987
DVI-D
Digital
1999
DVI-I
Analog &
Digital
1999
HDMI
Release A
2005
DisplayPort
Digital
2006
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