And do we need a DisplayPort?

By | September 11, 2016

Have passed nearly three years, as was a new standard signal interface for digital displays, called DisplayPort, and a year later, in April 2007 approved the current version 1.1.

It’s not a secret of the fact that analog standards are gradually giving way to digital. Cassette tape died long ago, and in their place came the CD, DVD and Blu-ray. Digital cameras have replaced photographic film, and on desktops instead of bulky CRT monitors began to put flat and compact LCD. The same fate befell the transmission of video formats. While the analog VGA connector can be found on any monitor, use it less and less. It was replaced by standard DVI and HDMI. But that’s not all.

Have passed nearly three years, as was a new standard signal interface for digital displays, called DisplayPort, and a year later, in April 2007 approved the current version 1.1. Can already be found in the sale of display card with this new connector, and what kind of animal and what he actually needed – is not particularly clear. I think that the time has come to understand.

DisplayPort

First of all, the new standard, which was developed by ATI (AMD), is intended, of course, in order to avoid paying royalties for the use of other standards, in particular DVI or HDMI, which is a competitor DisplayPort. But this long-term perspective, because you know that if you now release the video card, which of the connectors will only connectors DisplayPort – poor sales it provided, because not every monitor has the support of the standard.

Other reasons for any significant release of a new standard, I do not see. Yes, in a new format in a single connector carries both video and sound. But the same allows you to make and HDMI, the distribution of which is much greater. Yes, he has twice the signal bandwidth than DVI and HDMI, ie 10.8 Gbit / s instead of 5 Gb / s. But the increase in clock frequency from 165 to 340 Hz version HDMI 1.3, allowed to raise the capacity of HDMI to 10.2 Gb / s.

One might ask, why do we need such large quantities, if the bitrate of conventional film in Blu-ray format with the sound of DTS is from 30 to 50 Mbit / s? However, the stream passes through a cable in uncompressed form, so there are several other figures: 1,920 x 1,080 x 24 bit (color depth) x 24 frame. All together is roughly 1.2 Gbit / s. Ie to score the eyeballs channel DVI, it is necessary to increase the quality of the movie 4 times. By the way, the size of the video stream from DVD to Blu-ray increased just four or five times, so the stock has even DVI. Consequently, the bandwidth DisplayPort, as an advantage while you can not ignore.

DisplayPort

Have DisplayPort is another important difference from HDMI. This is the maximum cable length. At the moment, it is 15 meters to 5. Course, from the computer to the monitor, five meters should be enough, but here I have a TV, for example, is located seven meters from the computer, and in the case of the HDMI standard cable it is not enough . Of course, all is not lost, because there is a cable length of 15-35 meters with built-in amplifiers, signal them, but this is an additional cost. Here also would be useful advantage of the new standard, but the thing – for the moment at the official site displayport.org not presented any certified TV to this jack. So far no luck look at movies meter plasma through DisplayPort. However, such models will surely and pretty soon.

Another difference DisplayPort is that instead of HDCP, the copy protection used in HDMI, implemented technology DPCP (DisplayPort Content Protection) with 128-bit encryption. If for some it is an advantage, let them believe.

Summarizing, we can say that although the presence of DisplayPort connector on the VGA card or monitor can not be considered a minus, to the obvious pluses I would not attribute it became. Let it be, and if it is not, especially not worth the grief. And there, staring, Association VESA (Video Electronics Standards Association) finally figure out how to combine together different standards and until we settle for something ordinary, such as DVI or HDMI.

 

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