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DLPLCR4500EVM: Controlling micro mirrors to be on a "flat" state, even if not latched.

Joan Sendra
Prodigy 10 points
Part Number: DLPLCR4500EVM

Hi,

We are using the DLPLCR4500EVM board with the DMD (without the light engine) for a custom microscope setup. We are using a tunable laser and we are encountering problems with diffraction. Since the DMD acts as a blazed grating, the reflected beam direction is highly sensitive on wavelength. However, if the mirrors could be set to be in "parked" position, we could use the m=0 order which is independent of wavelength.


Is there a way to control a set of mirrors to be flat or parked position (so not only "on" or "off"?) I understand the GUI provided by TI does not allow it, but if there is a way communicating directly to the controller without going through the APIs, or modifying the board or buying a different DMD with this functionality, we would highly appreciate the help.

So far I've only found a similar question on this forum (http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/advanced_light_control/f/924/t/607695?tisearch=e2e-quicksearch&keymatch=flat%20position) , but in the answers it was not addressed if choosing another DMD could solve the issue.

Thank you in advance for your help,
Joan

  • 0
    TI__Mastermind 30875 points

    Hi Joan,

    PARKED or FLAT is not a valid active state for the DMD. When the DMD is powered and running it has only two active states either ON or OFF. You are not supposed to derive anything out in flat state of the DMD. 

    Please see the switch marked in the picture above, when the system is running, just flip the switch twice, don't worry about the direction of the switch, this would interrupt the processor to take the DMD in PARK state. 

    Again please note, that PARK is invalid state and you cannot derive anything from this state.

    Regards,
    Sanjeev