<s>
Unified	B-Protocol
Display	I-Protocol
Interface	I-Protocol
(	O
UDI	O
)	O
was	O
a	O
digital	B-Protocol
video	I-Protocol
interface	I-Protocol
specification	O
released	O
in	O
2006	O
which	O
was	O
based	O
on	O
Digital	B-Protocol
Visual	I-Protocol
Interface	I-Protocol
(	O
DVI	B-Protocol
)	O
.	O
</s>
<s>
It	O
was	O
intended	O
to	O
be	O
a	O
lower	O
cost	O
implementation	O
while	O
providing	O
compatibility	O
with	O
existing	O
High-Definition	B-Protocol
Multimedia	I-Protocol
Interface	I-Protocol
(	O
HDMI	B-Protocol
)	O
and	O
DVI	B-Protocol
displays	O
.	O
</s>
<s>
Unlike	O
HDMI	B-Protocol
,	O
which	O
is	O
aimed	O
at	O
high-definition	O
multimedia	O
consumer	O
electronics	O
devices	O
such	O
as	O
television	O
monitors	O
and	O
DVD	O
players	O
,	O
UDI	O
was	O
specifically	O
targeted	O
towards	O
computer	O
monitor	O
and	O
video	O
card	O
manufacturers	O
and	O
did	O
not	O
support	O
the	O
transfer	O
of	O
audio	O
data	O
.	O
</s>
<s>
A	O
contemporary	O
rival	O
standard	O
,	O
DisplayPort	B-Protocol
,	O
gained	O
significant	O
industry	O
support	O
starting	O
in	O
2007	O
and	O
the	O
UDI	O
specification	O
was	O
abandoned	O
shortly	O
thereafter	O
without	O
having	O
released	O
any	O
products	O
.	O
</s>
<s>
On	O
December	O
20	O
,	O
2005	O
,	O
the	O
UDI	O
Special	O
Interest	O
Group	O
(	O
UDI	B-Protocol
SIG	I-Protocol
)	O
was	O
announced	O
,	O
along	O
with	O
a	O
tentative	O
specification	O
called	O
version	O
0.8	O
.	O
</s>
<s>
The	O
group	O
,	O
which	O
worked	O
on	O
refining	O
the	O
specification	O
and	O
promoting	O
the	O
interface	B-Application
,	O
was	O
led	O
by	O
Intel	O
and	O
included	O
Apple	O
Computer	O
,	O
Intel	O
,	O
LG	O
,	O
NVIDIA	O
,	O
Samsung	B-Application
,	O
and	O
Silicon	O
Image	O
Inc	O
.	O
</s>
<s>
The	O
announcement	O
of	O
UDI	O
lagged	O
the	O
DisplayPort	B-Protocol
standard	O
by	O
a	O
few	O
months	O
,	O
which	O
had	O
been	O
unveiled	O
by	O
the	O
Video	O
Electronics	O
Standards	O
Association	O
(	O
VESA	O
)	O
in	O
May	O
2005	O
.	O
</s>
<s>
DisplayPort	B-Protocol
was	O
being	O
developed	O
by	O
a	O
rival	O
consortium	O
including	O
ATI	O
Technologies	O
,	O
Samsung	B-Application
,	O
NVIDIA	O
,	O
Dell	O
,	O
Hewlett	O
Packard	O
,	O
and	O
Molex	O
.	O
</s>
<s>
Fundamentally	O
,	O
DisplayPort	B-Protocol
transmits	O
video	O
in	O
packets	O
of	O
data	O
,	O
while	O
the	O
preceding	O
DVI	B-Protocol
and	O
HDMI	B-Protocol
standards	O
transmit	O
raw	O
video	O
as	O
a	O
digital	B-General_Concept
signal	O
;	O
UDI	O
took	O
an	O
approach	O
closer	O
to	O
DVI/HDMI	O
.	O
</s>
<s>
The	O
differences	O
between	O
UDI	O
and	O
HDMI	B-Protocol
were	O
kept	O
to	O
a	O
minimum	O
since	O
both	O
specifications	O
were	O
designed	O
for	O
long-term	O
compatibility	O
.	O
</s>
<s>
Again	O
,	O
UDI	O
lagged	O
DisplayPort	B-Protocol
by	O
a	O
few	O
months	O
,	O
which	O
had	O
released	O
its	O
finalized	O
version	O
1.0	O
specification	O
in	O
May	O
2006	O
.	O
</s>
<s>
The	O
group	O
changed	O
its	O
title	O
in	O
late	O
2006	O
from	O
"	O
special	O
interest	O
group	O
"	O
to	O
"	O
working	O
group	O
"	O
and	O
contemporary	O
press	O
coverage	O
noted	O
that	O
"	O
UDI	O
is	O
weak	O
when	O
it	O
comes	O
to	O
industry	O
support	O
"	O
,	O
accurately	O
predicting	O
the	O
future	O
DisplayPort/HDMI	O
duopoly	O
.	O
</s>
<s>
In	O
early	O
2007	O
Intel	O
started	O
supporting	O
the	O
rival	O
DisplayPort	B-Protocol
standard	O
;	O
anonymous	O
sources	O
stated	O
the	O
licensing	O
fees	O
associated	O
with	O
HDMI	B-Protocol
and	O
incorporation	O
of	O
HDCP	B-Protocol
into	O
DisplayPort	B-Protocol
swayed	O
Intel	O
's	O
support	O
.	O
</s>
<s>
Other	O
vendors	O
started	O
to	O
use	O
HDMI	B-Protocol
version	O
1.3	O
,	O
and	O
both	O
Intel	O
and	O
Samsung	B-Application
withdrew	O
their	O
support	O
from	O
UDI	O
.	O
</s>
<s>
The	O
external	O
profile	O
is	O
considered	O
an	O
extension	O
of	O
HDMI	B-Protocol
and	O
is	O
backwards-compatible	O
with	O
HDMI	B-Protocol
Rev	O
.	O
</s>
<s>
As	O
HDMI	B-Protocol
is	O
itself	O
an	O
extension	O
of	O
DVI	B-Protocol
with	O
HDCP	B-Protocol
,	O
UDI	O
external	O
profile	O
is	O
compatible	O
with	O
these	O
standards	O
as	O
well	O
.	O
</s>
<s>
The	O
embedded	O
profile	O
uses	O
an	O
ANSI	O
8b/10b	B-Protocol
encoding	I-Protocol
scheme	O
instead	O
.	O
</s>
<s>
UDI	O
provided	O
higher	O
bandwidth	O
than	O
its	O
predecessors	O
(	O
up	O
to	O
16	O
Gbit/s	O
in	O
its	O
first	O
version	O
,	O
compared	O
to	O
4.95Gbit/s	O
for	O
HDMI	B-Protocol
1.0	O
)	O
and	O
incorporated	O
a	O
form	O
of	O
digital	B-General_Concept
rights	O
management	O
known	O
as	O
HDCP	B-Protocol
.	O
</s>
<s>
The	O
"	O
embedded	O
"	O
implementation	O
was	O
only	O
specified	O
for	O
the	O
display	O
panel	O
interface	B-Application
and	O
had	O
a	O
single	O
row	O
of	O
26	O
contacts	O
,	O
while	O
the	O
"	O
external	O
"	O
implementation	O
had	O
a	O
single	O
row	O
of	O
22	O
contacts	O
inside	O
a	O
metal	O
shield	O
with	O
a	O
physically	O
keyed	O
rectangular	O
cross-section	O
,	O
resembling	O
the	O
USB	B-Protocol
Type	O
A	O
connectors	O
.	O
</s>
<s>
Transmit	O
and	O
receive	O
plugs	O
and	O
receptacles	O
were	O
different	O
physically	O
,	O
similar	O
to	O
peripheral	O
cables	O
with	O
USB-A	B-Protocol
and	O
USB-B	O
on	O
each	O
end	O
,	O
requiring	O
the	O
UDI	O
cable	O
to	O
be	O
plugged	O
in	O
one	O
way	O
only	O
.	O
</s>
