VESA updates DisplayPort Dual-Mode, pushes 4K UHD over HDMI

By Rick ยท 10 replies
Feb 1, 2013
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  1. Industry standards body VESA has officially updated its DisplayPort Dual-Mode 1.1 standard to provide better performance, higher resolutions and increased interoperability when hooking up to HDMI and DVI ports through a cable or adapter. Under Dual-Mode, a DisplayPort can output...

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  2. VitalyT

    VitalyT Russ-Puss Posts: 3,601   +1,888

    HDMI, Display Port, DVI, VGA, Thunderbolt, USB, Composite Video

    Anybody wants another type of video connector?

  3. Darth Shiv

    Darth Shiv TS Evangelist Posts: 1,797   +459

    VGA shouldn't really be used anymore for new PCs at least. Composite is a waste of time now too. USB never really been a serious player. Display Port... adoption for home users is poor except on Mac? I do wonder though... DisplayPort should have lower input lag than HDMI I would have thought. Thunderbolt hasn't taken off yet. Still to see if it does.
  4. captaincranky

    captaincranky TechSpot Addict Posts: 12,754   +2,429

    For computer use, probably. However, HDMI interface has a quirk that won't allow you to set aspect ratio going from a player of some type to a TV. So, I use it once in a blue moon.
    No, monitor manufacturers are using the display port interface to get around the licensing fee for HDMI connection. I have a 24" HP ZR24W that doesn't have HDMI, only display port.

    Ostensibly, Display port and HDMI should have the same video characteristics, sans the sound. Since specs are changing all the time, I'm not willing to stake my bad reputation on the veracity of that though.
  5. dividebyzero

    dividebyzero trainee n00b Posts: 4,891   +1,262

    Analog VGA and Component (or YPbPr, which is what I believe you meant), and DVI don't have the bandwidth for a 4K display- and even if they did, a lack of standardized signal quality guidelines and HDCP makes them a non-starter going forward as far as industry vendors are concerned.
    That pretty much leaves DisplayPort, HDMI and Thunderbolt the only real options, with the latter having a decided advantage if high bandwidth become the prime mover- and with 22.2 multichannel audio already mandated for the 4K spec, 60Hz refresh rate being more a starting point ( since 100Hz and 120Hz refresh panels are already being publicized), and provision for 30-bit colour you could see how the specification might need to take into account some serious bandwidth in future.
  6. VitalyT

    VitalyT Russ-Puss Posts: 3,601   +1,888

    30-bit color? Surely you meant 10-bit color? At least that's what it is called in the industry, 10-bit per channel, where a channel is one of the RGB-s ;) And those TV-s have been out there for years now, not much of a provision ;)

    By the way, the latest USB3 video links support up to 2560x1600, which is the maximum resolution on a today's 30" monitor ;) So, they are still in the game, just few people use them.
  7. dividebyzero

    dividebyzero trainee n00b Posts: 4,891   +1,262

    Call it whatever you like, the fact remains that the bandwidth needs to be accounted for either by raising the bandwidth throughput, or lowering refresh rate, if you aren't sacrificing colour depth. I'm not convinced that nitpicking a naming convention makes for a valid strategy in defending your argument tbh.
    Those panels generally tend towards a trade-off between colour depth against refresh rate. I think you'll also find that Deep Colour TV relies upon HDMI 1.3/1.4 input in almost every case, so that kind of blows your argument for the inclusion of VGA, Component, and USB....assuming the bandwidth limitation, lack of signalling standards, and lack of HDCP support haven't already done so to your satisfaction.
    The reason "few people" use USB as a display interface is more a product of latency issues and a lack of actual bandwidth. USB 3.0 is supposed to reach 5000Mbps (625MB/sec). After you deduct 8B/10B encoding and protocol overheads, packet framing, and flow control, you're left with around 3200Mbps (400MB/sec) - and that is being generous.
    VitalyT and Darth Shiv like this.
  8. Darth Shiv

    Darth Shiv TS Evangelist Posts: 1,797   +459

    Nice graphic
  9. VitalyT

    VitalyT Russ-Puss Posts: 3,601   +1,888

    Yeah, and it was deep :) and I'm not up for a war today, especially after the first post being there just for irony anyway :)

    Hatchet buried :)
  10. Darth Shiv

    Darth Shiv TS Evangelist Posts: 1,797   +459

    Yeah man no worries... just hoping some of them aren't taken seriously!
  11. I am thrilled about this news.

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