Definitions

graphic display interface

Unified Display Interface

Unified Display Interface (UDI) is a digital video interface specification based on Digital Visual Interface. 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. There has been no announcements made about UDI since early 2007 and the UDI website is no longer operational.

Overview

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 High-bandwidth Digital Content Protection. 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 video datastream.

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.. 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 compatibility. In early 2007 Samsung and Intel withdrew from the UDI SIG and no further announcements about UDI have been made since then.

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