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Illumination angle to DLP4500

Nobuyoshi Arai44
Expert 2575 points
Other Parts Discussed in Thread: DLP4500

I have got a question from our customer about the illumination angle to the DMD.

 

[Question]

Is there any limitation for the illumination angle to DMD(DLP4500)?

 

Our customer is designing their own optical engine and they are saying that the illumination angle is 56 degree.

I think the typical illumination angle is 24 degree. So, I would like to know what is concerned, if the illumination angle is so steep.

 

It would be helpful if you can give any comment to this question.

 

Best Regards,

Nobu Arai

  • 0
    TI__Guru 54175 points

    Hello Nobu,

    There are a number of issues to consider.

    • The AR coatings begin to roll off over 30°.  We do not have data that far out.
    • The outbound will not be centered on the window normal, so the DMD image will have some geometric distortion.
    • Some of the mirrors at the edge of the array will be occluded by the aperture.  This is ok if you are not illuminating all the way to the edge.
    • The effective fill factor will be different than the datasheet.

    What wavelength is planned.  Is this a visible application?

    Fizix

  • 0 in reply to Fizix
    Expert 2575 points

    Fizix-san,

    Thank you for the answer. I understood there are several issue can be considered.

    Do you mean the illumination angle should be less than 30 degree and if it is more than 30 degree, you do not know what happens and you cannot recommend?

    It seems the customer application is machine vision and visible LED is used.

    Best Regards,

    Nobu Arai 

  • 0 in reply to Nobuyoshi Arai44
    TI__Guru 54175 points

    Hello Nobuyoshi-san,

    This does not mean the configuration cannot be used, only that if they proceed these are some of the issues they will need to be aware of. 

    The only item that is unknown is the transmission of the AR coating on the window at the large incident angle.  They would need to test it.

    Fizix