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DLP7000: Illumination area of the DMD chip

Jun Ren91
Prodigy 30 points
Part Number: DLP7000
Other Parts Discussed in Thread: DLPLCR4500EVM

Hello,

I am selecting a DMD products for a research project. In this project, we need to program different patterns and illuminate them onto a small area of semiconductor (~1x5 mm^2) to control the free carrier distribution. I did not find any spec on the web related to illumination area, so I would ask if you experts have any recommendation. Thanks.

  • 0
    TI__Mastermind 43165 points
    Hello Jun,

    First, welcome to the DLP section of the TI-E2E forums.

    If you are purchasing a "DLP Discovery 4100 Development Kit" with a DLP7000 DMD, then the kit will not come with any optics. The projection area will be determined by your optics.

    You may want to start with something that already has an optical engine that you can change out the projection portion, such as the DLPLCR4500EVM.

    What light source do you plan to use to "illuminate" the semiconductor?

    Fizix
  • 0 in reply to Fizix
    Prodigy 30 points
    Hello Fizix,

    Thanks for your reply. Actually I do not have any part number in mind yet as I am not quite familiar with TI DMD products -- just heard from other colleagues that TI might have something close to what I need. What do you mean "the kit will not come with any optics"? I assume all the products are simply DMD chips, and we need to get another light source to illuminate the mirrors. Am I right?

    As for the light source, we currently have a couple of 808 nm laser diodes in lab. We hope they can be used to illuminate the DMD chip. And if I am not wrong, the illumination area is determined by the DMD chip, not the light source, right? So are you implying that certain TI products also come with additional optics that can help adjust the area of the illumination? We are aiming at something close of 1 x 5 mm^2. Is this something that is achievable? Thanks.
  • 0 in reply to Jun Ren91
    TI__Mastermind 43165 points
    If you buy just the DMD chips & controllers you would have to build your own board. Some of our Design Partners have offerings with light engines and projection optics. Some of our EVM's have this as well.

    A couple of examples of our EVM's are the DLPLCR3000EVM, and DLPLCR4500EVM. It will depend on how much resolution you need at the target. In either case you would need to remove the projection optics from the EVM and put your own optics in place to achieve the level of magnification/demagnification desired. I am certain the included optics will make an image that is way too big.

    Fizix
  • 0 in reply to Fizix
    Prodigy 30 points
    Hello Fizix,

    Does TI provide any assistance to adapt their EVM to meet customer's demand? Such as online documents showing how to change the optics for our desired image size? Thanks.
  • 0 in reply to Jun Ren91
    TI__Mastermind 43165 points

    Hello Jun,

    We have two avenues for this.  There are some YouTube videos on how to remove the optical engine, or parts of it. 

    Regarding making modified optics, we have general documents on optics available on the website available on this page:

    http://www.ti.com/dlp-chip/technical-documents.html 

    And for designing custom optics there are a number of Design Partners that can assist with this listed on the following page:

    http://www.ti.com/dlp-chip/support-training.html  

    Fizix