TIR Prism

To whom this may concern,

I am working with the LightCommander.  I would like to illuminate the DMD chip with a high-power LED array.  I can successfully collect the light coming off of the LED array using condenser lenses.  I understand it is commonplace to use a TIR prism (http://www.loreti.it/Download/PDF/DMD/140RE.pdf) for illuminating the DMD chip.  This is supposed to help with space considerations and improving brightness.  The LED array is 17mmX17mm, and I wan to maximize the amount of light projected (I am actually not projecting over a large area, but using a 1-1 macro lens to project a 1-1 image of the DMD). 

Would you recommend using a prism like this?  Can you tell me the easiest way to get ahold of one?  Thank you,


8 Replies

  • Hello,

    I also have this question but see that it was never answered. Is there a readily available source of TIR/reverse TIR prisms? The only company I've come across so far that say they can produce these is quoting approximately a $15,000 cost (includes NRE fee, etc.).

    I just need a single prism, for custom telecentric optics!

    Are there any consumer DLP projectors that include these? Perhaps one could just remove it and use it in a custom system.

    Thanks for any help,


  • Anthony Zorzos


    I have some practical experiance with this. How may I contact you by email?


  • Genius 16330 points

    Hello Anthony,

    I am sorry that your original post slipped through the cracks.

    Hello Victor,

    Welcome to the DLP section of the TI-E2E Community and thank you for jumping in on this.

    Most of the suppliers that supply TIR or RTIR prisms produce them for OEM projector manufacturers.  I can understand that a custom made TIR cost can be prohibitive. 

    TI does not make any recommendations on this.  However you may consider researching to find out which OEM projectors employ a TIR or RTIR prism and then see if you can obtain a used non-working projector to canabalize the prism to get started.




  • In reply to Fizix:

    Hi Anthony,

    DLi carries a CEL5500S based on the same 0.55 XGA chipset used on the LightCommander(TM).  The CEL5500S is a on-axis telecentric design.  Customers have been successful at porting LightCommander(TM) software.  If you're just getting started, you could use the CEL5500S as your development platform and may be able to go directly to production with it. 

    Contact me directly if you'd like more information.

    Jorge Moguel

  • In reply to Jorge Moguel:

    Hi Jorge

    I am interest in  CEL5500S. What is the price of this product. How can I buy it in China?


  • In reply to Deng Zhang1:

    Hi Deng,

    I hope all is well.  My name is Justin Lemon and I work directly with Jorge Moguel at DLi.  I saw your inquiry come through so I wanted to introduce myself as a point of contact.  If it is easiest, we can correspond through email.  I have my phone number below as well.  I will be glad to help you out.  What is your email address Deng?

    Justin Lemon

    Digital Light Innovations



  • In reply to Justin Lemon:

    Hi Justin,

     My email address is dongfangshendeng@gmail.com. I also have the problem of getting a tir prism. Would you please tell me how can I obtain a tir prism? I am in China.  

    Besides, I noticed a diffraction when I shed a laser light (488 nm) on DMD. Is it possible to get rid of it?  



  • In reply to Deng Zhang1:

    Hi Deng,

    The only way to obtain a TIR Prism (it actually comes with two prisms) is to purchase a CEL5500 Compact Embeddable Light Engine.  I will send you an email with some information.  Can you please remind me what your application is?


    Justin Lemon