Talk:Digital Visual Interface

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[edit] Pin 7 - DDC data

Is this pin used for transmitting EDID? What could happen if this pin is not available?

    Most transmitter systems (computers or video cards) will shut off
    the output if the EDID data or the Hot Plug Detect is not there.
    This is a function of the software that controls the transmitter.

Yostb 02:31, 6 June 2007 (UTC) yostb

[edit] Pin 15 & C5

According to DVI video pinout, C5 is for all analog ground. But in Wikipedia, Pin 15 is for "Return for pin 14 and analog sync"!! So, which pin is for analog sync ground, Pin 15 or C5?

"The long flat pin on a DVI-I connector is longer than the same pin on a DVI-D connector, so it is not possible to connect a male DVI-I to a female DVI-D by removing the 4 analog pins." Why is the C5 pin needed for DVI-D? Is it also for digital RGB ground?? —Preceding unsigned comment added by Totalz (talk • contribs)

Return = ground. — RevRagnarok ^{Talk Contrib} 20:51, 23 November 2006 (UTC)

[edit] Earlier comments

Other limitations? I've read that it's limited to 1920x1200 at 60Hz. (True?)

What are its possible successors? (Are they working on some sort of DVI-2?) Some high-end displays today require 2 (or even 4) DVI cables; obviously in a few years when 3+ megapixel displays are common, nobody is going to want to have a lot of cables strewn across their desks to their displays.

About right. I just added a section on Specifications - see the article. As you can see, a system called "dual link" exists. This uses the reserved pins in the standard connector, and therefore fits in a single cable. I don't know if anyone makes graphics cards or monitors using this system. --Heron 17:40, 19 Sep 2004 (UTC)

I think there needs to be a bit more information there.. 1920x1200 at 60Hz is only functional in interlaced mode with single-link, and I think the same is true of 1600x1200@60. I believe the best you can do for non-interlaced video is 1280x1024 (not sure about the refresh rate, though). —User:Mulad (talk) 16:19, May 2, 2005 (UTC)

Bullshit. The limit is 165MHz per link. 1920x1200x60 is 138MHz, which leaves a little headroom for blanking. There is no interlaced mode I'm aware of. --Dtcdthingy 03:35, 3 May 2005 (UTC)

Wait a minute, 1920x1200@60Hz should have a higher pixel clock than 1600x1200@60Hz. My math gets me 193 MHz with GTF. Looking closer, the listed 1920x1200@60Hz is not using GTF blanking while 1600x1200@60Hz is. It should be specified what blanking is being used. A 5% blanking would yield 146MHz. So I am guessing that we are using 10% blanking with this measure. Anyone have any idea? —Preceding unsigned comment added by 132.228.195.207 (talk • contribs)

[edit] dual link

the new apple 30 inch display uses the dual link. It runs at 2560x1600 which looks higher than the highest you wrote. It is made to work with the nvidia 6800 DDL Ultra (check on apple site).

Tgwena 01:38, 20 Sep 2004 (UTC)

I think that is "dual dual-link" (DDL), which could use two dual-link connectors to run the display, though I may be confused. The card might be so named in order to run two dual-link monitors. —User:Mulad (talk) 16:19, May 2, 2005 (UTC)

The latter. It uses a single dual-link cable for each monitor, and supports two of them. --Dtcdthingy 03:35, 3 May 2005 (UTC)

Now that many ATI X1300 cards claim to support 2560x1600. Does that mean they are dual link and compatible with the apple 30 inch cinema display? --Chochopk 18:40, 8 August 2006 (UTC)

[edit] dual link missing?

I see that in the history, that Dual link WAS mentioned in the article's Technical Discussion section, but then mysteriously disapeared. Is there a reason why? I have already added a section on Dual link to the Connector types section, but I'm quite puzzled as to why it disapeared from the article in the first place. CoolFox 04:08, Jun 6, 2005 (UTC)

Pardon? There's a great big paragraph on Dual Link in the Technical Discussion section, and I can't see any evidence in the page history that it was ever deleted since I originally wrote it. I've removed your new section accordingly. --Dtcdthingy 12:17, 6 Jun 2005 (UTC)

Hrm, looks like someone moved my paragraph to to the Technical Discussion... phttt. Oh well, problem solved. CoolFox 14:08, Jun 6, 2005 (UTC)

[edit] Metrication

I have temporaly reverted edits by Dtcdthingy until he explains why using metric units before imperial is "idiotic". There is no clear policy on the use of S.I. units for display diagonals, and while the standard in some countries is the inch, this is not always the case. This is the english language wikipedia after all.Thewikipedian 20:30 Jun 6, 2005 (UTC+2)

It's idiotic because the Apple display at least is called the "30-inch Cinema HD Display". There's no such thing as a "76cm Cinema HD Display". I love the metric system and all but its application in this case was totally mindless. --Dtcdthingy 20:07, 6 September 2005 (UTC)

I still prefer leaving "76 cm/30 inch cinema display" alone. It keeps the original name for the product while at the same time informing the reader of its equivalent in metric. See [this link] for instance. Perhaps wikipedia should open a new debate on this issue. Thewikipedian 23:19 September 15th, 2005 (UTC+2)

Outside the US, for street language and for marketing purposes, screen sizes are Named in Inches, in both the public and industial domains. 20:21 UTC, 9 Feb 06. 64.58.166.120 20:22, 9 February 2006 (UTC)

[edit] ATI DVI

I have one of these cables, 3x10 pins (less 1 polarising space) + 4 C pins and blade. If I find a my camera I'll upload a pic. Rich Farmbrough 11:23, 7 September 2005 (UTC)

I still have it. Pin 13 is the missing pin. Rich Farmbrough 17:59 20 June 2006 (GMT).

Similar to this Apple display connector

Apple display connector

but in a D-type connector shell. Rich Farmbrough 18:06 20 June 2006 (GMT).

Ah it;'s one of these - Plug & Display Rich Farmbrough 18:11 20 June 2006 (GMT).

If it's an ATI card, it might be one of these. The part number for the DVI Y-cable is 04E889, and the part number for the VGA Y-cable is 05E911. — A.M. 20:17, 20 June 2006 (UTC)

[edit] How long can the cable be?

Is this question appropriate for this article? Wadsworth 20:15, 31 October 2005 (UTC)

The DVI specification doesn't say anything about cable length. It depends entirely on the quality of the cable and the data rate of the signal, so there isn't a fixed number, though some examples wouldn't hurt --Dtcdthingy 05:09, 1 November 2005 (UTC)

It is helpful to have a guide to cable length, because for DVI it is short. DVI was conceived for connections within one room, meaning up to 3 meters for normally-price cables. However, some newer cables now coming into the market at up to 10 meters in length (incorporating more expensive/lower-loss wire). Extender/Converter Boxes are also available for longer runs. 20:30 UTC, 9 Feb 06. 64.58.166.120 20:32, 9 February 2006 (UTC)

On eof the refences says "The official DVI specification mandates that all DVI equipment must maintain a signal at 5 meters (16 feet) in length". Rich Farmbrough 17:59 20 June 2006 (GMT).

[edit] Notable DVI monitors?

AFAIK, many LCD monitors are DVI, so aren't we just comprising a List of People for monitors? 67.184.97.46 00:34, 19 November 2005 (UTC)

[edit] What the hell is doing this paragraph here?

NOTE - Do not expect a DVI-I to VGA converter to allow you to use a standard VGA monitor. I have a VGA monitor from Hyundai (Q995) and it doesn't work. I emailed them and they say it is standard for VGA monitors (not just theirs) not to function this way. If you are thinking of connecting a monitor this way it is worth checking that it will work or you may find yourself in the same situation as I am - a monitor that I cannot use and that I cannot get a refund for!

OK, it's a pity but that's not encyclopedic in any way!!! Please be serious about editing!!! This is an encyclopaedia not a computer forum!

Excuse me, but I believe the term "discussion" is roughly equivalent to "forum". Derp de der! —The preceding unsigned comment was added by 71.103.73.154 (talk • contribs) .

Actually, no. See WP:WIN, in particular:

Wikipedia is not a publisher of original thought

Wikipedia is not a place to publish your own thoughts and analyses. Please do not use Wikipedia for any of the following:

6. Discussion forums. Please try to stay on the task of creating an encyclopedia. You can chat with folks on their user talk pages, and should resolve problems with articles on the relevant talk pages, but please do not take discussion into articles. There are a number of early-stage projects that attempt to use a wiki for discussion and debate.

Atlant 22:52, 31 May 2006 (UTC)

[edit] Digital and binary

Previous standards were designed for CRT-based devices and thus did not use Discrete time. Some of them were Digital like EGA and CGA or Binary like MDA or analog like VGA.

Whats the difference between digital and binary? AFAIK, today's digital electronics uses two logic levels HIGH and LOW, thus making it same as binary. Multivalued logics are simulated using the two native logic levels which have hardware support. So, the article (2nd line, Overview section) is misleading, I feel. --06:39, 23 February 2006 (UTC)

I think "binary" refers to early computer colour displays where R, G and B were either "on" or "off"; giving just eight possible colours: Black, Red, Green, Blue, Cyan (Green+Blue), Yellow (Red + Green), Magenta (Red + Blue) and White. You are correct to observe that this is just a limiting case of a digital display, however! -- Kim SJ 12:47, 13 September 2006 (UTC)

[edit] Mini-DVI Pictures

I've just reverted 65.70.89.241's addition of a the Mini-DVI connector and diagram. I'm of the opinion that adding those pictures clutters the article a bit much and, for the real DVI section, is sorta off-topic. But that's just my preference, anybody else feel like opining? — Mobius 21:43, 5 August 2006 (UTC)

[edit] lcd blanking

I found this in the article..

HDTV (1920 × 1080) @ 60 Hz with 5% LCD blanking (131 MHz)
UXGA (1600 × 1200) @ 60 Hz with GTF blanking (161 MHz)

Both red links are not explained. Can someone please explain what LCD Blanking is? —Preceding unsigned comment added by 74.134.146.52 (talk • contribs)

I assume they mean the vertical blanking interval. — RevRagnarok ^{Talk Contrib} 03:49, 15 December 2006 (UTC)

[edit] Selective Refresh

"No compression is used and DVI has no provision for only transmitting changed parts of the image. This means the whole frame is constantly re-transmitted." -- This is not entirely correct, I believe. At least it could be hinted that in the specs (http://www.ddwg.org/lib/dvi_10.pdf), there's 1.2.2, "Conversion to Selective Refresh", a means to only transfer frame delta. There's obviously nothing resembling a definition yet, but at least it is mentioned and might possibly get extended in future revisions. —The preceding unsigned comment was added by 82.207.195.220 (talk • contribs).

Please feel free to be bold and add this information (and your citation) to the article!

Atlant 17:43, 27 December 2006 (UTC)

Ok, I did. I also changed the first external link that referred to the Homepage and added the specs as a second link. Please check .-) —The preceding unsigned comment was added by 82.207.195.220 (talk) 20:25, 27 December 2006 (UTC).

[edit] Article Picture Label

Should not the main picture for the article be labeled as DVI-I (Dual Link) not as DVI-D (Dual Link)? Just mislabeled? Kuba425 19:41, 17 February 2007 (UTC)

[edit] DVI to legacy VGA converter

It would be useful to include some information about this. Not least because I would be interested to know how they work (I have an LCD monitor but it only has a VGA connector!). It would also be useful for people considering a new graphics card but do not have a DVI compatible monitor. I can provide a photo of an adaptor if it becomes relevant to supply one. Crumbly Biscuits 17:21, 23 February 2007 (UTC)

This is covered in the connector section (which I've reworded slightly). The graphics card outputs a full set of VGA signals through extra pins on the DVI connector. A "converter" simply rearranges the pins so you can physically connect a VGA cable. --Dtcdthingy 13:40, 25 February 2007 (UTC)

It would also be nice to know about the DVI->S-Video/Composite adapter that Apple sells. (I'm sure others sell similar adapters as well...) Apple sells them for $20, but you can get a DVI->VGA and a VGA->S-Video/Composite adapter for much less. Is it the same thing? How are the pins connected? 131.215.44.237 23:02, 3 July 2007 (UTC)

That's just some Apple hack. It has nothing to do with the DVI standard. No idea about pinouts. --Dtcdthingy 19:58, 19 July 2007 (UTC)

[edit] DVI = Digital Video Interface or Digital Visual Interface?

I just read some websites about DVI, they all say DVI = Digital Video Interface and here on Wikipedia they call it Digital Visual Interface. Nice name but that isn't right is it? —Preceding unsigned comment added by 83.117.247.49 (talk • contribs)

The official PDF says Digital Visual Interface which means everybody else is just wrong... ;) — RevRagnarok ^{Talk Contrib} 23:38, 11 March 2007 (UTC)

[edit] Clock specs

The specification section should make clear that the clock rates specified are pixel clocks, not bit clocks. This can be confusing to neophytes, especially since there is no discussion of the embedded DVI requirement to have clock recovery on each pixel line (within each pixel clock). It might also be helpful to add a brief discussion of the clock recovery to decode the bits within each pixel (which is highly implementation specific, of course). 66.82.9.53 01:04, 30 May 2007 (UTC)

Cf. Transition Minimized Differential Signaling - don't want to overlap too much when another article talks about things. — RevRagnarok ^{Talk Contrib} 02:06, 30 May 2007 (UTC)

[edit] VGA Comparison

The "Overview" sections explains some of the reasons why is better than the VGA connector, however, it's way too technical. A simpler explanation should be added. —Preceding unsigned comment added by T0rek (talk • contribs) 10:18, August 28, 2007 (UTC)

[edit] "This article does not cite any references or sources" tag

It does now, including the DVI spec, surely you can't get more authoritative than that. Can we remove the tag? Bobcousins 15:51, 21 September 2007 (UTC)

[edit] Unclear how DVI signal is helped by using HDMI cables

In the HDMI page it mentions that HDMI cables can carry a DVI signal, via an adapter. Does using the HDMI cable overcome the DVI distance limitation, or are boosters still needed? Does using an HDMI cable have any other effects on a DVI signal? I am curious, but would also find this useful for the articles in question. --Alphastream 03:33, 3 November 2007 (UTC)

[edit] Pin C5, Always horizontal? or sometimes a cross / 'plus sign' shape

It seems, in the comparison of DVI types, that C5 is always horizontal, but I seem to have it in my head that I have seen sockets to accept a plus shape type C5. The Pinout/description also shows C5 keyed as a +. Is anybody able to clarify this, and would it warrant mention in the article? Thanks -- PidGin128 from 65.190.216.161 (talk) 06:48, 17 December 2007 (UTC) .