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Unified Display Interface

 
Computer Desktop Encyclopedia: UDI
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(1) (Unified Display Interface) A digital interface from the United Display Interface SIG that is designed to replace the analog VGA interface common on CRTs and flat panel monitors. UDI is expected to provide backward compatibility with DVI and HDMI interfaces. Intended for use on computers as well as consumer electronics devices, UDI supports HDCP digital rights management. See DVI and HDMI.

(2) (Uniform Driver Interface) A standard programming interface for writing device drivers for Unix operating systems. Supported by SCO, HP, IBM, Sun and others, once a driver is written to the UDI standard, it can be compiled in and used with each respective version of Unix. Drivers are complex pieces of code, which normally have to be written for each operating system. Providing a common way to write Unix drivers helps unify the Unix community.

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Wikipedia: Unified Display Interface
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Unified Display Interface
Type Digital video connector
Production history
Designer Unified Display Interface Work Group
Designed 2006 (Cancelled 2007)
Produced None
Specifications
Length 18.8 mm
Width 12.5 mm
Height 3.7 mm
Hot pluggable Yes
External Yes
Max. voltage +5V
Max. current 0.5 A
Audio signal No
Video signal Yes
Data signal R,G,B data + clock and display data channel (TDMS)
Width 36 bit (maximum)
Bandwidth 16 Gbit/s
Pins 26
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 1 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

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.

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.[1]

Contents

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.

News

See also

References

  1. ^ "UDI website". http://www.udiwg.org. Retrieved 2008-05-04. 


v • d • e
Audio and video connectors
Single conductor audio
Analog audio
TRS · XLR · DIN / Mini-DIN · D-sub · Speakon
Digital audio
BNC · S/PDIF · TosLink · XLR · D-sub
Video
DVI / Mini-DVI / Micro-DVI · DMS-59 · VGA / Mini-VGA · DFP · BNC · DIN / Mini-DIN · DB13W3 · D-Terminal
Audio and Video
RCA · ADC · Belling-Lee · DisplayPort / Mini DisplayPort · EVC · F · HDMI · P&D · SCART · TRS
Visual charts
Stub icon This computer hardware-related article is a stub. You can help Wikipedia by expanding it.
v • d • e
High-definition (HD)
Concepts
Analog broadcast
(All defunct): 819 line system • HD MAC • MUSE (Hi-Vision)
Digital broadcast
ATSC • DVB • ISDB • SBTVD • DMB-T/H
Audio
Dolby Digital (5.1) • MPEG-1 Layer II • PCM • LPCM • DXD • DSD • AAC
Filming and storage
HDV • DCI
HD media and
compression
Blu-ray Disc  • HD DVD(Discontinued) • HD VMD • D-VHS • Super Audio CD  • DVD-Audio  • MPEG-2 • H.264 • VC-1
Connectors
Component • HDMI • DVI • DisplayPort • VGA
Deployments

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