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Thread: OpenLDI Information

  1. #1
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    OpenLDI Information

    Hi. This message is primarily directed at churnopol, but I think it would be good to have the info posted and available to the forum, so I'm going to make this post.

    In the thread "good deal on a 10 inch LCD", way back in March 2003, he wrote:

    Quote Originally Posted by churnopol
    it has adjustable brightness controllers. I'll say it again, this is the best STN lcd monitor (but it's nothing like TFT). I use it for my carputer. The base and neck are also easy to remove. I've never had a brightness problem. But i keep it next to my arm rest. The only regret is the screen is too big. And you cannot use any other video card, it doesn't use VGA cables, it uses MDR-32. Nor does it use a VGA signal, it uses OpenLDI. Read my posts on the links below. I'm not getting into that again.

    Check out all the research i did, and my review on this monitor

    http://www.thisstrife.com/uberforum/...081&ForumUID=8

    http://www.thisstrife.com/uberforum/...030&ForumUID=8


    The reason its the best STN monitor because it uses OpenLDI instead of VGA. But the 4 meg pci card limits it abilities. There's 2 other cards out there that support OpenLDI, there well over $600

    If you really have doubts goto
    www.mp3playerstore.com
    Those links to the research he did are dead, and I was wondering if he, or anyone who read the info, could re-post the info (either a new link or just paste info in the thread).

    I know the very basics about it, ie the history, who developed it, how DVI supercedes it, etc, but I was wondering what else you might have found out.

    It looks like a couple people got that card ($99 WITH an LCD, albeit not a great one) and used it to control other LCD's. It seems like the OpenLDI based cards might be more suited to directly controlling LVDS LCD's than DVI cards. And I *am* aware that certain mobo's (and at least one reasonably priced graphics card that I know of) can interface directly with LVDS, I'm just curious about OpenLDI just to learn about it.

  2. #2
    Banned Motorcity's Avatar
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    Quote Originally Posted by spmclaugh
    Hi. This message is primarily directed at churnopol, but I think it would be good to have the info posted and available to the forum, so I'm going to make this post.

    In the thread "good deal on a 10 inch LCD", way back in March 2003, he wrote:



    Those links to the research he did are dead, and I was wondering if he, or anyone who read the info, could re-post the info (either a new link or just paste info in the thread).

    I know the very basics about it, ie the history, who developed it, how DVI supercedes it, etc, but I was wondering what else you might have found out.

    It looks like a couple people got that card ($99 WITH an LCD, albeit not a great one) and used it to control other LCD's. It seems like the OpenLDI based cards might be more suited to directly controlling LVDS LCD's than DVI cards. And I *am* aware that certain mobo's (and at least one reasonably priced graphics card that I know of) can interface directly with LVDS, I'm just curious about OpenLDI just to learn about it.
    OpenLDI is a dead horse, please don't beat it.
    DVI does not supercede OpenLDI. The 2 cannot be compared. OLDI Is more or less LVDS, except there are a few distinct signal diffferences. Also, OLDI uses a dedicated connector, much like DVI does.
    http://www.eecis.udel.edu/~girish/HW...giopenldi.html
    SGI (Silicon Graphics Inc) was the founder of OLDI. They, along with Mitsubishi developed it for use with SGI's computers. Look on ebay for the SGI 1600SW lcd monitor. Still sells for good $$ used, but unless you have the correct video card (only 2 I know of) one is http://cgi.ebay.com/Number-Nine-Revo...QQcmdZViewItem
    or you buy the multi-ink adaper (250) you can't use it.
    http://cgi.ebay.com/PIX-Link-1600SW-...QQcmdZViewItem

    DVI is Digital Video Interface. This is nothing like OLDI. DVI and VGA output cannot be made compatable with an OLDI monitor without the multi link adapter.
    http://www.interfacebus.com/Design_C...e_DVI_Bus.html

    I have spent a lot of time trying to use the 1600sw panel I have with the lvds output of a controller, with no luck so far.
    The 1600SW has a widescreen panel, and is 1600x1024 resolution. a bastard to say the least.
    Even if you were to use the multi link adapter, you still need a video card capable of outputting 1600x1024, which is not common in lower end cards.

    Now, there is also DFP, with is very similar to DVI. These 2 are cross compatable with only a dfp to dvi adapter being needed.
    http://www.cables4computer.com/produ...roupcode=I0061
    there are a lot of decent dfp panels on ebay cheap. I mean really cheap. most people don't have a clue with dfp, and when they see the bastard dfp20 connector, they assume dedicated equipment is needed for it. Not true.
    http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

    using a video card with OLDI output may or may not work with an lvds panel. I doubt it will, given that the whole aspect of OLDI is lvds based, but not the exact same.

    not sure if any of my babble helped or not.

  3. #3
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    Quote Originally Posted by Motorcity
    OpenLDI is a dead horse, please don't beat it.
    Well, I'll try not to beat it too much.
    DVI does not supercede OpenLDI. The 2 cannot be compared.
    Well...
    Quote Originally Posted by pcmag.com
    (OPEN LVDS Digital Interface) A digital interface for a flat panel display based on LVDS and endorsed by SGI, Number Nine, National Semiconductor and others. The first flat panel monitor to use this interface was SGI's award-winning 1600SW with a 1600x1024x16M resolution. OpenLDI was superseded by DVI. See DVI, flat panel display and LVDS.
    I know that's a very "qualitative" statement, but... they do both use differential signaling, and Silicon Image was behind a lot of the development of both. I'm not saying they're pinout-compatible or even very similar, but conceptually and architecturally, there's similarities.
    OLDI Is more or less LVDS, except there are a few distinct signal diffferences. Also, OLDI uses a dedicated connector, much like DVI does.
    http://www.eecis.udel.edu/~girish/HW...giopenldi.html
    SGI (Silicon Graphics Inc) was the founder of OLDI. They, along with Mitsubishi developed it for use with SGI's computers. Look on ebay for the SGI 1600SW lcd monitor. Still sells for good $$ used, but unless you have the correct video card (...) or you buy the multi-ink adaper (250) you can't use it.
    Agree with everything here.
    DVI is Digital Video Interface. This is nothing like OLDI. DVI and VGA output cannot be made compatable with an OLDI monitor without the multi link adapter.
    http://www.interfacebus.com/Design_C...e_DVI_Bus.html
    Well, see above comment, I don't strongly disagree (how politically correct does that sound?). Definitely nothing like VGA, I don't think either of us even suggested that.
    I have spent a lot of time trying to use the 1600sw panel I have with the lvds output of a controller, with no luck so far.
    The 1600SW has a widescreen panel, and is 1600x1024 resolution. a bastard to say the least.
    Even if you were to use the multi link adapter, you still need a video card capable of outputting 1600x1024, which is not common in lower end cards.
    Well, they aren't going to be pinout-compatible, nothing a solder-job is going to do. I was thinking that an FPGA a uProc could be rigged up for the job. There are people out there who have already done this, it isn't THAT huge of a task, but it would require a very good knowledge of all the various timings, etc. By the time you figure it out, it might be easier to just interface directly with the LCD's row & column drivers and hook the LCD up via a COM port (using your own proprietary protocol).
    Now, there is also DFP, with is very similar to DVI. These 2 are cross compatable with only a dfp to dvi adapter being needed.
    there are a lot of decent dfp panels on ebay cheap. I mean really cheap. most people don't have a clue with dfp, and when they see the bastard dfp20 connector, they assume dedicated equipment is needed for it.
    Yea, I got my Viewsonic VPD150 15" probably... 6 years ago, probably longer (I forget?). It was unbelievably cheap, and I just used a $20 DFP-DVI converter (purely a passive device to connect the right pins together, I think).
    using a video card with OLDI output may or may not work with an lvds panel. I doubt it will, given that the whole aspect of OLDI is lvds based, but not the exact same.
    Check this out:

    en.wikipedia.org/wiki/DVI
    Quote Originally Posted by wikipedia
    DVI is the only widespread standard that includes analog and digital transmission options in the same connector. Competing standards are exclusively digital: these include a system using low-voltage differential signalling (LVDS), known by its proprietary names FPD (for Flat-Panel Display) Link and FLATLINK; and its successors, the LVDS Display Interface (LDI) and OpenLDI.
    LDI is what we "lay people" often refer to as LVDS (which actually just stands for Low Voltage Differential Signaling, a pretty basic technology). My SCSI-3-Ultra2 LVD card technically uses LVDS technology (the "S" just stands for signaling). I think Firewire and SATA both use it. It's just a clean way to transport data. Anyway, I'd guess that LDI and OpenLDI are pretty similar standards.
    not sure if any of my babble helped or not.
    Definitely a good post, I do wonder though if anyone has the original post by churnopol, I just want to see if it got into the "guts" of the protocol. Again, this is all just out of curiousity, I don't see myself buying an OpenLDI video card or monitor. If I wanted to use an LVDS display directly, there are plenty of easier ways.

    Anyway, if that info is long gone, this thread can die in peace

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