by Anton Shilov
01/11/2010 | 09:02 AM
The Video Electronics Standards Association (VESA) has formally unveiled DisplayPort v1.2 digital communication interface standard for transporting display, audio and other data. The new version of DisplayPort enables high-resolution stereo 3D displays and many other improvements.
VESA’s DisplayPort version 1.2 is a comprehensive extension to the original DisplayPort standard offering many new benefits to the end user. DisplayPort v1.2 increases performance by doubling the maximum data transfer rate from 10.8Gb/s (Gigabits-per-second) to 21.6Gb/s, greatly increasing display resolution, color depths, refresh rates, and multiple display capabilities. Higher performance data transfer enables higher performance 3D stereo displays, higher resolutions and color depths, and fastest refresh rates. Besides, DisplayPort 1.2 is able to transport USB data between a PC and Display, supporting Display USB functions such as a webcam and USB hub. DisplayPort v1.2 is backward compatible with existing DisplayPort v1.1a systems, including existing cables and the Mini DisplayPort connector.
DisplayPort v1.2 supports “multi-streaming” – the ability to transport multiple independent uncompressed display and audio streams over a single cable, supporting protected content and high performance applications such as 3D gaming. This enables the use of multiple monitors connected by cable in a daisy chain or hub configuration. Whereas the current Display v1.1a standard can support one 2560x1600 monitor at 60Hz, DisplayPort v1.2 can support two such monitors with one cable, or four 1920x1200 monitors. Many other combinations are possible, including multiple video sources, multiple displays (even at different resolutions) and multiple audio speakers.
Another new feature is the ability to support high-speed, bi-directional data transfer, allowing USB 2.0 or Ethernet data to be carried within a standard DisplayPort cable. For DisplayPort v1.2, the maximum data rate of this “AUX” channel has been increased from 1Mb/s to 720Mb/s, providing suitable bandwidth for USB 2.0. The DisplayPort cable can therefore support USB data to/from the display to support Display USB functions, in addition to sending the video and audio information. Standard Ethernet can also be transported in the DisplayPort cable.
DisplayPort v1.2 was designed to be compatible with existing DisplayPort systems and cables. To take advantage of the new capabilities, a PC will need to be DisplayPort v1.2 enabled, however existing standard cables can still be used, including those with the new Mini-DisplayPort connector. To achieve the 21.6Gb/s rate, the per-lane data rate is doubled from 2.7Gb/s to 5.4Gb/s, over the four lanes that exist in the standard cable. For a single display, this enables up to 3840x2400 resolution at 60Hz, or a 3D display (120Hz) at 2560x1600.
DisplayPort v1.2 also adds new audio enhancements including the following: Audio Copy Protection and category codes, high-definition audio formats such as Dolby MAT, DTS HD, all Blu-Ray formats, and the DRA standard from China, synchronization assist between audio and video, multiple audio channels, and multiple audio sink devices using Global Time Code (GTC).
DisplayPort v1.2 also includes improved support for Full HD 3D stereoscopic displays: 3D stereo transmission format support includes field sequential, side by side, pixel interleaved, dual interface, and stacked.