Unified Display Interface (UDI) was a digital video interface
specification based on
Digital Visual Interface
Digital Visual Interface (DVI). It was intended
to be a lower cost implementation while providing compatibility with
High-Definition Multimedia Interface
High-Definition Multimedia Interface (HDMI) and DVI displays.
Unlike HDMI, which is aimed at high-definition multimedia consumer
electronics devices such as television monitors and DVD players, UDI
was specifically targeted towards computer monitor and video card
manufacturers and did not support the transfer of audio data.
UDI was primarily backed by
Intel with support from
Samsung and other
partners. In early 2007
Intel started supporting the similar
DisplayPort standard, and both
Samsung withdrew from the UDI
SIG. There has been no announcements made about UDI since early 2007
and the UDI website is no longer operational.
UDI provides higher bandwidth than its predecessors (up to 16 Gbit/s
in its first version, compared to 4.9 Gbit/s for
HDMI 1.0) and
incorporates a form of digital rights management known as HDCP. The
connector has a single row of 26 contacts pitched 0.6 mm apart
from each other, looking very similar to the
USB plug which has a
single row with only four contacts. Three of the 26 contacts will not
be wired but are reserved for undetermined future upgrade
possibilities. Transmit and receive plugs are slightly different, and
a UDI cable will fit only one way. Bidirectional communication works
at a much lower data rate than that available for the single direction
On December 20, 2005, the UDI
Special Interest Group (UDI SIG) was
announced. They worked on determining the refined specifications and
promoting the interface. Members included Apple Computer, Intel, LG,
NVIDIA, Samsung, and
Silicon Image Inc.
Silicon Image Inc. The UDI specification was
finalized in July 2006. The differences between UDI and
HDMI was kept
to a minimum since both specifications were designed for long-term
Unified Display Interface Nears Release". DailyTech. 2006-07-03.
"Next-gen display standard emerges for PC, HDTVs". EETimes.
2005-12-20. Retrieved 2006-08-15.
"Industry group promotes UDI as successor of VGA graphical interface".
TG Daily. 2005-12-20. Retrieved 2006-08-15.
^ Tuan Nguyen (2007-02-19). "The Future of HDMI". DailyTech. Retrieved
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