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DLP4710: Where do I start?

Dong Yi
Prodigy 20 points
Part Number: DLP4710

Hello community, 

I'm new to all this so please bear with me. I am currently building a UV resin 3D printer and after failing with LCD screens (the coloured pixel filters plus the tint of the polarising film seem to block 99% of the UV light) so I decided to give projectors a go.

I'm running a software that uses two monitors - one for the main control software, the other to project the static images of each slice being cured. Does the DLP + EVM platform behave as a secondary monitor, as in, does the PC automatically detects it once the HDMI cable is connected?

Also, I'd like to know if the DLP chip can be operated with a UV laser beam shining directly onto it without damaging? I'd like to start with an entry level chip and EVM set as the price tag for the UV specific DLP sets are beyond my budget. What would you recommend? 

Thanks,

Dong 

  • 0
    TI__Mastermind 28005 points
    Hello Dong Yi,

    Thanks for your interest in our DLP products.

    To answer your first question, yes. The DLP4710EVM has a standard HDMI frontend that looks like a regular display device to your laptop. You can use it as a secondary monitor with no trouble.

    As for your question about UV application, you will want to review the "Recommended Operating Conditions" page in section 6.4 of the DLP4710 datasheet at (www.ti.com/.../dlp4710.pdf). Assuming you are interested in operating below the 400nm range, you will see reduced device lifetimes with the standard DMD.

    On that note, I would recommend that you consider one of our specialized DMDs optimized for UV applications.You can review the list of said DMDs at (www.ti.com/.../products.html).

    I hope this helps.

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Prodigy 20 points

    Hello Philippe, thank you for your prompt reply.

    I read an article about optimum wavelength for achieving maximum tensile strength on most UV curing resins and the data indicated that 405 nm is the optimum wavelength.

    I started with FDM 3D printing and then moved to SLA after purchasing a WANHAO Duplicator 7. It uses a 30W UV LED under a smartphone 2560 x 1440 pixel LCD screen as shutter for the projected pictures of each layer to be cured. The printing volume, however, is very limited (120 mm x 68 mm base area x 150mm height). I thought I could do better by making a bigger version - I managed to replicate the electro-mechanical side of it using an Arduino controller with a RAMPs 1.4 3D printer shield. Tried using commercial PC monitor LCDs and failed miserably. I guess the only reason the Wanhao D7 works is due to the small thickness of the LCD. 

    Anyway, using PC monitor LCD screens is out of the equation due to the coloured RGB filters in each pixel, the inherent tint of the polarising film plus the augmented thickness of the LCD dislay - unless I use a medical grade B&W LCD screen which cost $20K...but I'm not risking that amount of money for another failure in potential.

    After a quick read in the DLP4710 datasheet, light reflection and diffusion from the borders can result in undesired effects. That's why I imagined a highly focused X - Y scanning UV laser beam over the DMD at a frequency that the DMD don't get destroyed. I guess a direct fan cooling over the DMD surface may be the solution (?) - also, finding the maximum wattage of the laser source that keeps the process within the acceptable watts / cm2 value would be the key for a reliable and consistent SLA system.

    Anyway, I'm working on it.

    Thanks again for your guidance.

  • 0 in reply to Dong Yi
    TI__Mastermind 28005 points
    No problem. I am glad to be of assistance.

    To work out the details of your specialized application, you may want to check out our DLP application notes at www.ti.com/.../overview.html

    Specifically, I would point you to our UV-level system design considerations page at www.ti.com/.../dlpa060.pdf which may provide further insight for your project.

    I hope this helps.

    Best Regards,
    Philippe Dollo