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DLP2010EVM-LC: Controlling pattern display time under internal pattern mode

Yuk Ching LEUNG
Prodigy 170 points

Part Number: DLP2010EVM-LC

Hi there,

I have recently purchased a DLP2010EVM-LC. I find it wonderful with the easy to use GUI and detailed python documentation.

I would like to display a series of phase patterns (8-bit). Each pattern will stay on scene for any desirable period of time (let’s say 1s). I successfully use the internal pattern mode to display the pattern. When the exposure time is small, I can see the pattern clearly when I pause the sequence and move step by step. But the speed is way too high that I suspect if my camera will be able to capture each individual pattern. So I would like to have the pattern to stay longer on the scene (for any desirable period of time).

When I increase the exposure time, I start to see each pattern as a series of RGB pattern (which I guess is due to the RGB switching of the LED). I also observe that the projector displays each bit plane sequentially. My question is, is it possible to keep the high frame rate (so the pattern colour and bit plane look mixed) while setting any desirable display time for the pattern?

I have one idea at the moment. I can program the sequence in the advanced GUI. The pattern can be displayed at short exposure time “repeatedly/continuously”. Then use a Python timer to switch the pattern. Is there any other way (probably built in function) to achieve the same objective? Thank you very much and I am looking forward to you reply!

Jeff Leung

  • 0
    TI__Mastermind 23070 points

    Hello Jeff,

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

    Could you please explain your requirement in details? preferably a upload a drawing of the pattern your would like to display?

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 170 points

    Hi Vivek

    Thank you for your reply. I have a series of sinusoidal fringe patterns to display (Please see the figure below). The pattern is 480 rows x 1 col in size (the EVM will copy the pattern to every column) and 8 bit. 

    I would like to display the pattern for some desired period of time and therefore, I look into adjustment of exposure time (in Fig. 2). For small exposure time like 1000 us, I can see the pattern perfectly if I click on Pause. But I want the pattern to stay there for longer period of time without clicking on the Pause button. When I increase the exposure time to like 50000 us, I will see the pattern flashing. The flashing includes two parts. One part is RGB color switching. The other part is the bit-plane switching. So I wonder if there is any way that I can keep the pattern stay still for any period of time without the flashing issue. 

    Thank you very much!

    Jeff Leung

  • 0 in reply to Yuk Ching LEUNG
    TI__Genius 9971 points

    Hi Jeff Leung,

    Kindly look into the "Sequence Timings for DLPC347x Light Control Platform FAQ". It will provide you the info regarding the range of supported exposure timings.

    Unfortunately, the pattern exposure times which you are looking for are not supported. 

    One simple solution which I can think of for your requirement is that you can display a single pattern multiple times in order to achieve a higher single pattern display time. But, please note that the pattern will not be displayed continuously as there will be pre and post exposure dark time associated with each run.

    Thanks and regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Prodigy 170 points

    Hi Mayank,

    Thank you for your reply. I was thinking of the same way to achieve higher pattern display time too, meanwhile wondering if there is any other built in function that I haven't noticed. It seems that displaying the pattern repeatedly is the right way to extent the display time. Many thanks. 

    Jeff Leung