Unified Display Interface
| Type | Digital video connector | ||
|---|---|---|---|
| Production history | |||
| Designer | Unified Display Interface Work Group | ||
| Designed | 2006 | ||
| Produced | 2006 | ||
| 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 (TDMS) | ||
| Width | 36 bit (maximum) | ||
| Bitrate | 16 Gbps | ||
| Pinout | |||
| 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 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 1 data (userd for x1 and x3 lane widths) | UDI_Data2- | |
| Pin 17 | Shield for 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 | |
Unified Display Interface (UDI) is a digital video interface specification based on Digital Visual Interface. It is 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 is specifically targeted towards the needs of computer monitor and video card manufacturers.
Overview
UDI provides higher bandwidth than its predecessors (up to 16 Gb/s in its first version, compared to 4.9 Gb/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 Intel-initiated USB plug which has a single row with only 4 contacts. 3 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 include Silicon Image Inc., Intel, Apple Computer, LG, Samsung and NVIDIA.
The specification was finalized in July 2006. The differences between UDI and HDMI will be kept to a minimum, as both specifications will be aligned for long-term compatibility.
DisplayPort is a competing standard which is also under development.
By CES 2007, Samsung and Intel have withdrawn from the UDI SIG, with Apple likely to follow suit. With those major players dropping support for UDI, the standard will unlikely be implemented in a widespread fashion, if at all, especially with the adoption of the competing DisplayPort as a VESA standard.
External links
News
- "Unified Display Interface Nears Release". DailyTech. 2006-07-03. Retrieved 2006-08-15.
{{cite web}}: Check date values in:|date=(help) - "Next-gen display standard emerges for PC, HDTVs". EETimes. 2005-12-20. Retrieved 2006-08-15.
{{cite web}}: Check date values in:|date=(help) - "Industry group promotes UDI as successor of VGA graphical interface". TG Daily. 2005-12-20. Retrieved 2006-08-15.
{{cite web}}: Check date values in:|date=(help)
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