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DLP4710LC: The actual diffracted spot phenomenon projected by DLP is not the same as the expected diffracted spot phenomenon.

User_mgi_2023
Prodigy 60 points
Part Number: DLP4710LC

Hello, TI engineer ！

I learnt from the article DMD Optical Efficiency for Visible Wavelengths that the 5.4 µm Pitch DMD diffracted spot should be as shown below.

DLP Diffraction Spot

However, the actual diffracted spot measured by me is shifted in both X and Y directions. It is felt that the zero-level diffraction spot moves to the upper left.

Measured 5.4 µm Pitch DMD Diffraction Spot

S0, my question is, is this normal?

  • 0
    TI__Mastermind 23030 points

    Hello,

    Welcome to DLP forum and thank you for your interest in DLP technology.

    The image will depend on the illumination angle and F/# of the light. The referenced image is for  TRP DMD is illuminated at 34degree angle with a telecentric F/1.7 light bundle.

    You image seems to form a highly collimated light source (ex. laser) and a different illumination angle. \

    How are you illuminating the DMD - F/# & illumination angle? Is DMD operational?

    regards,

    Vivek