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A comparison of next-gen display interfaces

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Hardware
By Rick C. Hodgin   
Tuesday, July 31, 2007 16:50
Article Index
A comparison of next-gen display interfaces
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Breakdown Comparison Chart

 

Comparison of Video Interconnect Standards
DescriptionDVIHDMIUDIDisplayPort
Revision1.01.3a1.0a1.1
IntroducedApr 2, 1999Dec 9, 2002Jun 16, 2006May 2006
Last ChangeApr 2, 1999Nov 10, 2006Jul 12, 2006Mar 19, 2007
ImpetusVisualVisual/AudioVisual/AudioHigh Speed, Flexible Wrapper for Visual/Audio + Data
Controlling AuthorityDigital Display Working GroupDigital Display Working GroupUDI PromotersVESA
TypeProprietary, FreeProprietary, Fee basedProprietary, FreeOpen, Free
Backward CompatibilityVGADVIHDMIHDMI
DigitalYesPrimaryPrimaryPrimary
AnalogOptionalOptionalOptionalIndirect
Fiber OpticsYesIndirectIndirectYes
RFNoNoNoYes
VideoYesYesYesYes, Optional
AudioNo8-channel, 192 kHz, 24-bit uncompressed8-channel, 192 kHz, 24-bit uncompressed8-channel, 192 kHz, 24-bit uncompressed
DataNoLimitedLimited1 MB/s dedicated + lane space
Note: DisplayPort does not require video or audio data.
Security40-bit HDCP40-bit HDCP40-bit HDCP128-bit AES DPCP & 40-bit HDCP
Note: HDCP is a fee-based encryption protocol. DPCP, by Philips, is free.
Max bits/pixel24 (48 is allowed, but not officially defined)483648
Min bits/pixel12241818
Max Resolution2560 x 16002560 x 16002560 x 16002560 x 1600
Note: Higher custom resolutions may also be available.
Min Resolution640 x 480640 x 480640 x 480zero, video data is optional
Note: Only computer video modes are displayed.
Max Refresh Hz120120120Variable, 120
Min Refresh Hz605060zero
Note: Interconnects used for TV signals can clock as low as 24 Hz
Max Pixel Clock340 MHz (in dual-link mode, 165 MHz in single-link mode)340 MHz (in dual-link mode, 165 MHz in single-link mode)At least 414 MHzAt least 450 MHz
Min Pixel Clock25.175 MHz25.175 MHz25.175 MHzzero
Max Bandwidth3.96 Gbps (10.2 Gbps in dual-link mode)3.96 Gbps (10.2 Gbps in dual-link mode)16 Gbps10.8 Gbps
Rigid Clock SignalYesYesYesNo
Hot PlugYesYesYesYes
Audio IncludedNoIEC 61937, up to 6.144 MbpsIndirectly (via HDMI)IEC 60958, up to 6.144 Mbps
Signal Repeater DefinedNoYesYesYes
1080pYesYesYesYes
1080iYesYesYesYes
Note: All standards support video modes below 1080i.

It should also be noted that each specification is nearly identical in theoretical maximum limits to the others. The differences in the number of pins and defined implementation are the only real limits. DisplayPort is the most flexible definition because of its packaging system for data. It speaks to the future needs of variable payloads, and not just audio and video. The other standards could also be redefined to move data in this way, but are not currently.
SupportersIntel, Compaq, Fujitsu, Hewlett Packard, IBM, NEC and Silicon ImageHitachi, Matsushita, Philips, Silicon Image, Sony, Thompson, ToshibaApple, Intel, LG, National Semiconductor, Samsung, Silicon ImageAgilent, AMD, Apple, Dell, Hewlett Packard, Intel, Lenovo, Molex, NVIDIA, Philips, Samsung, several others. Officially supported by VESA as the new standard.

 

 

 

Read on next page:  Background - Display interface considerations and standards



 

Shop Keywords: HDMI, LCD, UDI, Displayport, DVI, LCD

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