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.

Unified Display Interface
Type Digital video connector
Production history
Designed 2006 (Cancelled 2007)
Produced None
General specifications
Length 18.8 mm
Width 12.5 mm
Height 3.7 mm
Hot pluggable Yes
External Yes
Audio signal No
Video signal Yes
Pins 26
Electrical
Max. voltage +5V
Max. current 0.5 A
Data
Data signal R,G,B data + clock and display data channel (TMDS)
Width 36 bit (maximum)
Bitrate 16 Gbit/s
Pin out
Pin 1 Supply voltage for data link circutry VDD_UDL
Pin 2 Supply voltage for data link circutry VDD_UDL
Pin 3 Supply voltage for data link circutry VDD_UDL
Pin 4 Supply voltage for data link circutry VDD_UDL
Pin 5 Supply return for control and data link power VSS
Pin 6 Supply return for control and data link power VSS
Pin 7 Supply return for control and data link power VSS
Pin 8 Supply return for control and data link power VSS
Pin 9 Positive side of UDI lane 0 data (userd for x1 and x3 lane widths) UDI_Data0+
Pin 10 Negative side of UDI lane 0 data (userd for x1 and x3 lane widths) UDI_Data0-
Pin 11 Shield for UDI_Data0[-/-] GND
Pin 12 Positive side of UDI lane 1 data (userd for x1 and x3 lane widths) UDI_Data1+
Pin 13 Negative side of UDI lane 1 data (userd for x1 and x3 lane widths) UDI_Data1-
Pin 14 Shield for UDI_Data1[-/-] Ground
Pin 15 Positive side of UDI lane 2 data (userd for x1 and x3 lane widths) UDI_Data2+
Pin 16 Negative side of UDI lane 2 data (userd for x1 and x3 lane widths) UDI_Data2-
Pin 17 Shield for UDI_Data2[-/-] GND
Pin 18 Reserved connector pin. No cable connection (NC)
Pin 19 Reserved connector pin. No cable connection (NC)
Pin 20 Reserved connector pin. No cable connection (NC)
Pin 21 (Test Pin)
Pin 22 Ground return GND
Pin 23 Supply voltage for control link signals UDI_EPwr
Pin 24 UDI control link clock UDI_CtrlClk
Pin 25 UDI Control link data UDI_CtrlData
Pin 26 UDI link hot-plug detect UDI_HPD

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 Intel and 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.

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.[1] 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. 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.

News
  • "Unified Display Interface Nears Release". DailyTech. 2006-07-03. Archived from the original on 2006-07-13. Retrieved 2006-08-15.
  • "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. Archived from the original on 2005-12-23. Retrieved 2006-08-15.

References
  1. Tuan Nguyen (2007-02-19). "The Future of HDMI". DailyTech. Archived from the original on 2007-06-10. Retrieved 2007-07-16.
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