12.3 / A.Kobayashi
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.
interface; bandwidth; packet
transport; industry standard; SERDES; LCD; LVDS, DVI,
HDMI, PC, HDTV; VESA; CEA, .
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 transport of isochronous streams such as uncompressed
video and audio. AUX CH is a half-duplex bidirectional
channel used for link management and device c