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Lost of 3D sync using DLP-Link on a laser projector

6332797
Prodigy 20 points

I'm having problems locking to a 3D movie image with active 3D glasses (XPAND & Ultra-clear DLP glasses) and a blue laser projector using RGBY wheel.  I tried to find help info on DLP-Link, but find that this mode is proprietary with TI.  Projector produces correct double image (left & right eye mixed) on screen, but glasses drift in sync about every 4-5 minutes.  I'm wondering about the DLP white flash might be from the "Y" part of the wheel and there may need to be a color filter over the sensor in the glasses.  illumination from the projector is between 3500 to 4000 lumens onto a 8 foot wide screen in 1920x1080 resolution.

Previous projector before the upgrade to a laser model worked fine in 3D with a RGBCMY wheel, but was only 1200 to 1800 lumens.  Any ideas to solve this problem?

Please advise.

  • 0
    TI__Intellectual 2290 points

    I am not aware of any particular color sensitivity in any DLP® Link(TM) glasses.  There isn't any reason that they should have a sensitivity to yellow.  DLP Link is not color dependent.  DLP Link pulses are typically red or blue, although they can be any color.  I would not expect yellow to be a problem.

    If you want to know more about how it works, please see this post; there is a reference there to details on DLP link.  https://e2e.ti.com/support/dlp/f/94/t/663116 .  

    Hopefully that is helpful.

     - Gary

  • 0 in reply to Gary S
    Prodigy 20 points

    Thank you Gary for your comments on color sensitivity.  I was looking into possible color spectrum or lumen intensity issues with this blue laser DLP projector during DLP-Link operation. My active DLP glasses just wasn't locking into sync with 3D movies. I finally removed a cell from a solar powered toy, added a 330 ohm resistor to make a light detector to check the laser projector's output on an oscilloscope.  I found that there was no DLP-Link light pulse during the 3D movie presentation. The 3D projector settings are correct, but the light pulse is missing from this new projector.  I checked an older DLP projector with my light detector and it did have the DLP-Link pulse.  Last night I sent an Email to the projector manufacturer with my test results and photos.  Doesn't TI supply the DLP-Link software to the manufacturer or does the manufacturer have to write it?

  • 0 in reply to 6332797
    TI__Intellectual 2290 points

    DLP® Link™ is available in the DLP® development tools; it is up to the projector developer/manufacturer to enable and configure it in the tool if they want to enable/support it. They also need to provide the end-user a way to enable it or select that mode via their OSD, GUI, front-end etc..

    I think you are on the right track contacting the projector manufacturer.

    Good Luck.

     - Gary