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DLP3010EVM-LC: Deflection angle

Solène Corneille
Prodigy 20 points
Part Number: DLP3010EVM-LC

Hi,

I am using the DLP3010EVM-LC for my project and I noticed that the beam was slightly deviated upwards. I measured a deflection angle of about 13 degrees.

I expected the light to come out on the same axis as the lens. Is this normal, or does my DLP have a defect?

Thank you for your clarification.

  • 0
    TI__Genius 12785 points

    Hello User,

    Welcome to the E2E forum and thank you for your interest in DLP® technology!

    I will have to investigate if this is the typical behavior for the DMD. Is there any drop in performance or image quality outside of the beam deviation?

    Regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 20 points

    Thank you for your response. There is no drop in performance or image quality.

    There you can see what I said earlier. The middle of the image is not aligned with the axis of the objective, there is a shift upwards.

    It is even more remarkable when I put a screen directly next to the objective (one can see the mark of the objective, and that of the image which is clearly shifted upwards).

  • 0 in reply to Solène Corneille
    TI__Genius 12785 points

    Hi User,

    Thank you for sending these images. They have helped me understand your question.

    The DLP3010EVM-LC, like most of our EVMS, has a vertical offset of 100% by default. This will cause the projected image to be shifted up as you are seeing it. This offset can be adjusted in the DLP EVM GUI 3.1.0.6 Advanced GUI screen under the Keystone menu.

    The description for this offset command can be found in Section 3.3.5.1 (page 60) of the DLPC3478 Software Programmer's Guide.

    Please let us know if you have any additional question, and thank you for your business.

    Kind regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 20 points

    I tried to change the value of the Optical DMD Offset, but when the pitch angle is zero, it doesn't change anything (If I understand correctly, pitch angle in my case should be zero because the projection axis is perpendicular to the projected image). Is that normal?

  • 0 in reply to Solène Corneille
    TI__Genius 9865 points

    Hi User,

    Can you share the result and Command log of Keystone Projection Pitch Angle and Keystone Correction Control when you click "Get" from the above GUI window?

    Regards,

    Lori 

  • 0 in reply to Lori Wang
    Prodigy 20 points

    Of course.

     

    The "get" button seems to correctly returns the data that has been sent. But I'm not sure I understand correctly what these parameters do to the image. I thought that changing the optical dmd offset would shift vertically the center of the image (as I want to align it with to the optical axis of the objective). But it seems to slightly compress the image along the vertical axis (and the center of the image does'nt move). Plus, when the pitch angle is equal to zero, nothing happens when I change the keystone correction control.

    Thank you for your help!

  • +1 in reply to Solène Corneille
    TI__Genius 12785 points

    Hello User,

    I have to make a correction to my previous statement. The optical engine in the DLP3010EVM-LC is designed with the offset due to lens placement. The image may be able to be readjusted by centering the lenses in the optical engine though this may be somewhat challenging. Alternatively you can try to compensate for this by using keystone, though this may result in a compressed image as you have noted.

    Regards,

    Austin