Unified Display Interface
Unified Display Interface (UDI) was a digital video interface specification based on Digital Visual Interface (DVI). It was intended to be a lower cost implementation while providing compatibility with existing 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. It was effectively replaced by the DisplayPort standard before products were released.

Overview 
UDI provided 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 incorporated a form of digital rights management known as HDCP.
The connector had 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 are not wired but were reserved for undetermined future upgrade possibilities. Transmit and receive plugs were slightly different, and a UDI cable would fit only one way. Bidirectional communication worked at a much lower data rate than that available for the single direction video datastream.

On December 20, 2005, the UDI Special Interest Group (UDI SIG) was announced, along with a tentative specification called version 0.8.
The group worked on the refined specifications and promoting the interface. Members included Apple Computer, Intel, LG, NVIDIA, Samsung, and Silicon Image Inc.
The UDI specification 1.0 was finalized in July 2006.  The differences between UDI and HDMI was kept to a minimum since both specifications were designed for long-term compatibility.
The group changed its name in late 2006 from "special interest group" to "working group".

In early 2007 Intel started supporting the similar DisplayPort standard, vendors started to use HDMI version 1.3, and both Intel and Samsung withdrew their support. There has been no announcements made about UDI since early 2007 and the UDI website became no longer operational after 2007.

References

Digital display connectors
High-definition television