FOR EDITORIAL INFORMATION:
DisplayPort Technical Overview
Abstract: This paper provides a technical overview of VESA DisplayPort proposed
standard, Version 1, Draft 1. DisplayPort consists of a uni-directional Main Link for
transporting isochronous A/V streams from Source device to Sink device and a half-
duplex bi-directional AUX CH used for realizing robust plug-n-play ease of use.
Both Main Link and AUX CH are made of AC-coupled differential pairs. The Main
Link may have 1, 2, or 4 pairs (or lanes), each capable of supporting application
bandwidth of 270Mbytes/second while AUX CH has 1 pair. DisplayPort requires no
pair for forwarding the clock, thus making the maximum usage of differential pairs.
For example, 1680x1050-panel can be supported via a single Main Link lane. Using
the handshake via AUXH CH, DisplayPort link is properly configured and monitored
to realize the robust plug-n-play and ease of use. Source and Sink devices complaint
with DisplayPort specification will properly interoperate over 15-meter cable-connector
assembly. Connector is compact and has an optional latching feature to avoid
undesirable “cable fall-off”. Adopting a layered and modular architecture, DisplayPort
can take advantage of advancement of Physical Layer without affecting Link Layer and
above. Based on “micro-packet” architecture, DisplayPort is seamlessly extensible
for supporting transport of multiple A/V streams and other data types for enabling new
display application scenarios.
Keywords: display; interface; bandwidth; packet transport; industry standard;
SERDES; LCD; LVDS, DVI, HDMI, PC, HDTV; VESA; CEA, .
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Make-up of DisplayPort
DisplayPort link consists of Main Link, AUX CH, and Hot Plug Detect (HPD) signal line.
As shown in the following diagram, Main Link is a uni-directional, high-bandwidth, and
low-latency channel used for trans