Unified Display Interface

Infobox connector
name=Unified Display Interface
type=Digital video connector


logo=
caption=
designer=Unified Display Interface Work Group
design_date=2006
manufacturer=
production_date=
superseded=
superseded_by=
superseded_by_date=
external=Yes
hotplug=Yes
length=18.8 mm
width= 12.5 mm
height=3.7 mm
electrical=
ground=
maximum_voltage=+5V
maximum_current=0.5 A
audio_signal=No
video_signal=Yes
data_signal=R,G,B data + clock and display data channel (TDMS)
data_bit_width=36 bit (maximum)
data_bandwidth=16 Gbit/s
data_devices=
data_style=
cable=
physical_connector=
num_pins=26
pinout_

pinout_caption=
pin1=VDD_UDL
pin1_name=Supply voltage for data link circutry
pin2=VDD_UDL
pin2_name=Supply voltage for data link circutry
pin3=VDD_UDL
pin3_name=Supply voltage for data link circutry
pin4=VDD_UDL
pin4_name=Supply voltage for data link circutry
pin5=VSS
pin5_name=Supply return for control and data link power
pin6=VSS
pin6_name=Supply return for control and data link power
pin7=VSS
pin7_name=Supply return for control and data link power
pin8=VSS
pin8_name=Supply return for control and data link power
pin9=UDI_Data0+
pin9_name= Positive side of UDI lane 0 data (userd for x1 and x3 lane widths)
pin10=UDI_Data0-
pin10_name=Negative side of UDI lane 0 data (userd for x1 and x3 lane widths)
pin11=GND
pin11_name= Shield for UDI_Data0 [-/-]
pin12=UDI_Data1+
pin12_name=Positive side of UDI lane 1 data (userd for x1 and x3 lane widths)
pin13=UDI_Data1-
pin13_name=Negative side of UDI lane 1 data (userd for x1 and x3 lane widths)
pin14=Ground
pin14_name=Shield for UDI_Data1 [-/-]
pin15=UDI_Data2+
pin15_name=Positive side of UDI lane 2 data (userd for x1 and x3 lane widths)
pin16=UDI_Data2-
pin16_name=Negative side of UDI lane 1 data (userd for x1 and x3 lane widths)
pin17=GND
pin17_name=Shield for UDI_Data2 [-/-]
pin18=(NC)
pin18_name=Reserved connector pin. No cable connection
pin19=(NC)
pin19_name=Reserved connector pin. No cable connection
pin20=(NC)
pin20_name=Reserved connector pin. No cable connection
pin21=(Test Pin)
pin21_name=
pin22=GND
pin22_name=Ground return
pin23=UDI_EPwr
pin23_name=Supply voltage for control link signals
pin24=UDI_CtrlClk
pin24_name=UDI control link clock
pin25=UDI_CtrlData
pin25_name=UDI Control link data
pin26=UDI_HPD
pin26_name=UDI link hot-plug detect
pin27=
pin27_name=
pin28=
pin28_name=
pin29=
pin29_name=
pin30=
pin30_name=
pin31=
pin31_name=
pin_custom1_name=
pin_name_custom1=
pin_custom1=
pin_custom2_name=
pin_name_custom2=
pin_custom2=
pin_custom3_name=
pin_name_custom3=
pin_custom3=
pin_custom4_name=
pin_name_custom4=
pin_custom4=
pin_custom5_name=
pin_name_custom5=
pin_custom5=
pin_custom6_name=
pin_name_custom6=
pin_custom6=
pin_custom7_name=
pin_name_custom7=
pin_custom7=
pin_custom8_name=
pin_name_custom8=
pin_custom8=
pinout_notes=

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. [cite web
url=http://www.udiwg.org |title=UDI website |accessdate=2008-05-04]

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.

News

*cite web
date = 2006-07-03
url = http://www.dailytech.com/article.aspx?newsid=3098
title = Unified Display Interface Nears Release
publisher = DailyTech
accessdate = 2006-08-15
*cite web
date = 2005-12-20
url = http://eetuk.com/tech/news/showArticle.jhtml?articleID=175007227
title = Next-gen display standard emerges for PC, HDTVs
publisher = EETimes
accessdate = 2006-08-15
*cite web
date = 2005-12-20
url = http://www.tgdaily.com/2005/12/20/udisig_formation/
title = Industry group promotes UDI as successor of VGA graphical interface
publisher = TG Daily
accessdate = 2006-08-15

References