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DLP2010: DLP Light Crafter Display EVM GUI Tool - Keystone correction

Frank Hendricks
Prodigy 10 points
Part Number: DLP2010
Other Parts Discussed in Thread: DLPC3435

Greetings,

We are using the DLP LightCrafter Display 2010 evaluation model with the DLPC3435 display controller and the DLP2010 DMD. For a projection system we need to use the keystone correction to deal with distortion. It's writen in the user guide that the software can do keystone correction for up to +-40° angle. Now we are designing our system in Zemax and want to implement the keystone trapezoid.

So, my question is, how will the pre-distorted image look like on the DMD?

How should I set my field points in Zemax to simulate a keystone correction of let's say for example 40°?

How is the 40° angle related to the shape of the pre-distorted trapezoid?

Thank you very much for your help in advance.

Best regards

Frank

  • 0
    TI__Mastermind 23070 points
    Hi Frank,
    Keystone correction is performed on the software side, not the optics design side, and is done by sacrificing a portion of the system’s resolution/image area.
    The optical design in Zemax should include field points covering the entire DMD array. If you then simulated a tilted screen the trapezoidal image shape would be present.
    Changing the field points to simulate keystone correction would effectively be changing the DMD size/shape in the model. This is not something we ever do since keystone correction is done digitally. In the optical model we would want to see the full extent of the distortion that will be present.
    Hope this answer your question. Please let me know if you have additional question.

    Regards,
    ViveK