So why do screens with a DisplayPort interface even exist?ĭoes this easy conversion with DP++ mean that every screen or projector should just have an HDMI interface? No, it does not, because it’s always better to connect devices which use the same protocol. This explains the need for an active, more sophisticated adapter. So an adapter with some computing power is always needed that does the computing at the connection. HDMI does not support a way to force a signal translation onto the GPU. When going the other way round, things are less straightforward. And what about HDMI to DisplayPort conversions? Check with the customer service of the graphics card manufacturer for the type of adapter that suits your requirements the best. Many graphics cards can’t support DP++ output to multiple monitors. Furthermore, when you want to connect multiple DVI or HDMI monitors to a DisplayPort output, you will need an active adapter or splitter as well. Note however that this simple transition only applies to single-link DVI signals, so up to HD resolution. There is normally no loss in quality when using such a dp to hdmi cable. You even don't really need a special adapter anymore, because there are DisplayPort to HDMI cables available on the market.
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The system is completely plug and play, handles both video and audio, and does not need any driver to work. The pins of the DisplayPort connector are then mapped onto the HDMI pins, making the transition very simple. The theory of DP++ is actually quite simple: when the device detects an HDMI adapter attached to it, the graphics card or GPU (Graphical Processing Unit) will automatically make a translation and send HDMI TMDS signals via the video output. You might find the DP++ logo on the device, but because it is so widespread most modern consumer products don’t mention the logo anymore. Although this is an optional feature and not part of the actual standard, it is available on most consumer devices’ video cards. The tippy technology that allows the use of a simple passive adapter, is called DisplayPort Dual-Mode (or DP++). This makes the passive DP-to-HDMI adapter even more mysterious… Making the translation It uses another signal type technology and even a lower cable voltage (3.3 V instead of the 5 V of HDMI/DVI). So if you want to use both audio and video, you either need to use a (quite expensive) converter, or connect the audio to the display in a different way - for example via the headphone jack.ĭisplayPort (and mini DisplayPort) on the other hand, is something completely different. Note however that HDMI does support digital audio, whereas DVI is purely a video standard. So you do need an active adapter to make the conversion.
For resolutions above HD, however, there is High Speed HDMI, which diverts from the dual link DVI you would use. This applies to single link DVI, supporting resolutions up to 2048 x 1200. Using a simple connector-to-connector type adapter cable, you could switch from DVI to HDMI and vice versa. They both use TMDS (Transition-Minimized Differential Signaling), a technology to transmit data. Because HDMI was created as a follow-up to DVI, the two standards were very similar at the beginning. DVI, HDMI and DisplayPortįirst, let’s talk about the similarities between DVI and HDMI.
Although certainly not a general truth, it is more likely you want to connect a DisplayPort output to an HDMI input than the other way round. Oddly enough, this means that the display ports are usually HDMI ports. In other words, we could say that DisplayPort comes from the video source side (AV receivers, computers, etc.), and HDMI more from the visualization side (HDTV, projectors, etc.). HDMI was conceived by manufacturers of displays, whereas DisplayPort comes from the IT-world.
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But what exactly is going on inside these adapters, and is converting DP to HDMI always that easy? And is there a difference between consumer and professional use? In this article, we explore the complete reasoning.Īs already explained in a previous article, DisplayPort and HDMI were created by different consortiums, with different applications in mind. The reason? An HDMI to DisplayPort conversion always requires an active instead of a passive adapter. But if you want to go the other way round, you will need to dive a whole lot deeper into your pockets.
DisplayPort to HDMI adapters generally cost about 7 dollars.
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