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DLPDLCR2000EVM: DLP eye safety question

Jeremy Johnson41
Prodigy 30 points
Part Number: DLPDLCR2000EVM

Could TI or anybody advise on safety issues re using the DLP LightCrafter Display 2000 EVM for an education project (a text based music synthesiser interface, specifically *not* a near eye application).

If the projector was pointed into eyes briefly what brightness levels would be required to cause damage and can this unit achieve them? These are particularly portable and the chances that kids might point them at each other is greater than with larger projectors. Do I need to lock down the unit to make this less likely or hard code a brightness maximum maybe?  Any links to appropriate guidelines welcome.

  • 0
    Prodigy 30 points
    Addendum: For the record, I'm following the precautionary principal. I have a concept design which uses the DLPDLCR2000EVM completely enclosed (but ventilated for cooling) as a tiny back projection unit, and will use that unless I have specific and reliable information that this type and brightness of projector cannot cause eye damage even if used 'unreasonably'. My question is really whether there is any reliable research on safe limits for this type of light source.
  • 0
    TI__Mastermind 20045 points
    Hello Jeremy,
    The DLPDLCR2000EVM outputs approximately 20 lumens. The light source are red, green, and blue LEDs.

    I do not know if we have information available or are able to comment on the specific related safety concerns. Let us look into this and we'll get back to you.

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 30 points

    Hi Kyle,

    Thanks for looking into it. I noted the 20 Lumens, but apparently it's all down to intensity (measured in microWatts per cm3), and the amount of UV involved. However unless there are specific circumstances related to TI DLP tech then I'm going to go with them being reasonably harmless. Petzl make a Children's TIKKID 20 Lumen Hybrid Headlamp and claim the 20 lumen limit is 'to limit photo-biological risk and protect sensitive young eyes'. When I get a DLPDLCR2000EVM I'll make a call about how adventurous to be with it. It will most likely stay housed in a case of some kind. Thank you for your assistance.

    Jeremy.

  • 0 in reply to Jeremy Johnson41
    TI__Mastermind 28005 points
    Jeremy,

    Typically, we don't expect these sort of optical engines to be used by pointing them directly at the user. We have identified the LEDs on this system as being high powered enough to be an eye safety risk, so there is certainly cause for concern.

    That being said, I have a few quick suggestions for you. First off, the DLPDLCR2000EVM can be reconfigured to have different brightness settings on the individual LEDs. You can set the system to operate lower than 30 lumens based on your assessment of the device. Furthermore, you should also check out the actual LEDs used in the system. From the DLPDLCR2000EVM User's Guide, the part numbers for these are:
    > OSRAM LE BA Q6WM
    > OSRAM LCG H9RM

    By reviewing the datasheets associated with these parts you may get a better idea of what brightness levels would be considered appropriate for an application with illumination that is directed at the eye.

    I hope this helps.

    Best Regards,
    Philippe Dollo