DisplayPort is a digital display interface developed by the Video Electronics Standards Association (VESA). The interface is primarily used to connect a video source to a display device such as a computer monitor, though it can also be used to transmit audio, USB, and other forms of data.
|Pin Name||Description||Pin Name||Description|
|1||ML_Lane 0 (p)||Lane 0 (positive)||ML_Lane 3 (n)||Lane 3 (negative)|
|3||ML_Lane 0 (n)||Lane 0 (negative)||ML_Lane 3 (p)||Lane 3 (positive)|
|4||ML_Lane 1 (p)||Lane 1 (positive)||ML_Lane 2 (n)||Lane 2 (negative)|
|6||ML_Lane 1 (n)||Lane 1 (negative)||ML_Lane 2 (p)||Lane 2 (positive)|
|7||ML_Lane 2 (p)||Lane 2 (positive)||ML_Lane 1 (n)||Lane 1 (negative)|
|9||ML_Lane 2 (n)||Lane 2 (negative)||ML_Lane 1 (p)||Lane 1 (positive)|
|10||ML_Lane 3 (p)||Lane 3 (positive)||ML_Lane 0 (n)||Lane 0 (negative)|
|12||ML_Lane 3 (n)||Lane 3 (negative)||ML_Lane 0 (p)||Lane 0 (positive)|
|13||CONFIG1||connected to Ground. Pins 13 and 14 may either be
directly connected to ground or connected to
ground through a pulldown device.
|14||CONFIG2||connected to Ground|
|15||AUX CH (p)||Auxiliary Channel (positive)|
|17||AUX CH (n)||Auxiliary Channel (negative)|
|18||Hot Plug||Hot Plug Detect|
|19||Return||Return for Power|
|20||DP_PWR||Power for connector (3.3 V 500 mA)|
In the standard male-to-male DisplayPort cable, the four main differential pairs *and their polarities* are flipped (Lanes 0 <-> 3, Lanes 1 <-> 2, and all (P) <-> (N)). In other words, the first 12 pins on either end of the cable are in reversed order with respect to the other connector; the remaining 8 pins go straight through as usual.
Dual-mode DisplayPort can directly emit single-link HDMI and DVI signals using a simple passive adapter that adjusts for the lower voltages required by DisplayPort. When dual-mode chipset detects that a DVI or HDMI passive adapter is attached, it switches to DVI/HDMI mode which uses the 4-lane main DisplayPort link and the AUX channel link to transmit 3 TMDS signals, a clock signal and Display Data Channel data/clock. Dual-mode ports are marked with the DP++ logo; most current DisplayPort graphics cards and monitors offer this mode.
A notable limitation is that dual-mode can only transmit single-link DVI/HDMI, as the number of pins in the DisplayPort connector is insufficient for dual-link connections; an active converter is needed for Dual-Link DVI (and analog component video such as VGA, since it employs digital to analog conversion). Active conversion can be powered by +3.3 V wire in the DisplayPort connector, but some active adapters require external power.