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DisplayPort

2020-10-23

DisplayPort is mainly used to transfer video, audio, USB and other formats of data information between the source side and the device side (such as a computer Monitor). The DisplayPort specification is a free license designed to replace VGA, DVI, and LVDS to provide high-performance video transmission channels. Users can use Adapter compatible with current VGA/DVI display devices. While the functionality supported is similar to HDMI, the goal is to complement HDMI, not replace it.

DisplayPort consists of three separate related standards: a peripheral DisplayPort(externalDisplayPort Interface) standard and two internal interfaces DisplayPort standards: Embedded DisplayPort(eDP) and internalDisplayPort(iDP). Since 2010, the External DisplayPort Interface has made some headway in the mobile PC and PC display markets. EDP is mainly used for mobile and embedded devices; IDP is similar to eDP, but is mainly used in digital TELEVISION equipment. EDP and iDP are designed in their respective fields to replace LVDS

The DP interface (DisplayPort) is an image display interface that supports not only full HD Resolution (1920×1080), but ALSO 4K resolution (3840×2160) and the latest 8K resolution (7680×4320). DP interface not only has high transmission rate, but also is reliable and stable. Signals transmitted by the interface are composed of data Channel signals of image transmission and auxiliary Channel signals of image-related state and control information, including Main Channel (Main Link), AUX Channel (AUX Channel) and Link Training.

A special bus, AUX Channel, is provided in DP for the handshake between source and sink. Because the Source is the controller of the process, it makes requests for Sink. The only way for Sink to communicate with the source is to send a pulse in the hot swap detection (HPD) signal. AUX Channel, as an independent bidirectional transmission auxiliary Channel in DP interface, adopts ac coupled differential transmission mode and is a bidirectional half-duplex transmission Channel with a single-direction rate of only about 1Mbit/s to transmit setting and control instructions.

Next: Difference between EDP screen and LVDS screen

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