DLP4710EVM-LC: Replacement for LightCrafter 6500

Part Number: DLP4710EVM-LC
Other Parts Discussed in Thread: DLPC3479, DLP2010LC, DLPC3470, DLP2010, DLPC3478

Hello!

We are successfully using two LightCrafter 6500 modules in a neuroscientific visual stimulation setup. We want to build another similar third setup but unfortunately the LC6500 is not available anymore. Thus, I am now looking for a replacement module.


It is important for us is:

  • the module allows pixel accurate presentation of the provided video stream (like the “video pattern mode” on the LC6500 with the pattern stream provided by HDMI or DP)
  • the module has a precise frame-wise trigger out
  • the module allows high 8-bit greyscale framerates (>= 120 Hz) in pattern mode

In my own research on your modules I found the DLP4710EVM-LC which apparently meets our criteria. It seems to allow 180 Hz 8 bit video pattern mode.

Could you confirm the latter? Are there other module with similar or better specs?

Thanks a lot for your support!

Best,
Malte

  • Dear Malte, EKB Technologies offers a platform with different variants that utilize the 4710 light control chip-set.   The series called E4750-LC with pixel level control)

    You are welcome to check https://www.ekbtechnologies.com/e-store/047-1080p-1920x1080

    should you have any questions please feel free to contact us directly.

    Yuval

  • Malte,

    This chipset (The DLPC3479) should indeed meet your requirements, given you are OK with 180Hz external pattern streaming. You should refer to the controller datasheet to confirm the specifications work for you:

    https://www.ti.com/lit/ds/symlink/dlpc3479.pdf

    Best Regards,

    Philippe Dollo

  • Thanks a lot for the info!

    Just to be sure: would the DLP4710EVM-LC actually be the device from your LightCrafter product portfolio that offers the highest 8-bit greyscale frame rate, i.e. there are no modules (apart from the LC6500 that reached EOL) that provide higher frame rates? Thanks!

    Best,

    Malte

  • Malte,

    That may depend on your requirements. You can achieve higher 8-bit greyscale frame rate with the DLP2010-LC EVM (which gets you 360 Hz 8-bit rate) at the cost of resolution (the DLP2010LC runs at 854x480 WVGA). Do you have a full list of requirements?

    https://www.ti.com/tool/DLP2010EVM-LC 

    Regards,

    Philippe

  • Hello Philippe,

    thanks a lot for the info!

    Our requirements are basically what I mentioned above:

    • pixel accurate presentation (pattern mode!)
    • pattern stream provided continuously by HDMI or DP
    • high 8-bit greyscale framerates in pattern mode (360 Hz would be brilliant)
    • precise frame-wise trigger out

    the lower resolution of the DLP2010-LC EVM would be less of a concern in our case. Since we would strongly modify the optics anyway, other aspects are also less important.

    Could you confirm that we can achieve 8-bit greyscale framerates in pattern mode at 360 Hz with the DLP2010-LC EVM? I actually have difficulties to extract this information from the data sheets.

    Thanks again for your support!

    Best
    Malte

  • Malte,

    Yes, the DLP2010-LC EVM can support 360 Hz for 8-bit patterns. These limits are detailed on the front page of the DLPC3470 datasheet.

    In particular, you are interested in pattern streaming via HDMI. A 360 Hz pattern rate for 8-bit is achieved by streaming HDMI video at 120 Hz containing RGB888 frames. These frames are broken down into sets of 8-bit patterns (each color R/G/B represents one 8-bit pattern). This allows you to send 3 patterns per 120 Hz frame, which gives you can effective pattern rate of 360 Hz.

    Let me know if you have additional questions.

    Best Regards,

    Philippe Dollo

  • Philippe, thank you very much for your reply!


    I have a follow up question regarding the triggering:

    I installed the DLP2010 GUI tool and had a look at the trigger settings. When choosing RGB illumination at 8 bit depth (to achieve 360 Hz subframe-rate for 120 Hz RGB frame-rate) it looks to me that I can only set a trigger per complete RGB frame, and not per subframe. I.e., I would not get a precise trigger for the start of each subframe. Is that correct? And is it also correct that it would be the same for the DLP4710EVM-LC, i.e., also here I can get no information about the start of each color subframe? Looking at it from the other side: if I need a trigger for every frame I would still only achieve 120 Hz with the  DLP2010-LC EVM, right?

    Thanks again for your support!

    Best,
    Malte

  • Malte,

    Let me check what is best approach for 8-bit 360Hz pattern streaming in this regard and post back here sometime this week.

    Best Regards,

    Philippe Dollo

  • Malte, 

    You can use the rising edge of trigger out2 to capture the start of each subframe. The functionality of Trigger Out1,2 signals are same across DLPC3470, DLPC3478 and DLPC3479. 

    Does your application usecase requires RGB pattern display only or can it work with the monochrome (only one color) pattern display as well. Please check out the monochrome pattern display functionality of the DLPC347X chipset as well. 

    Regards,

    Mayank

  • Thank you, Mayank!

    Would you be so kind to explain to me which settings in the GUI tool would lead to a trigger edge for each subframe? I did not manage to find the correct settings. I am currently running the GUI tool without a LightCrafter conected, but I suspect that the settings could still be done.

    I assume that I need the illumination setting on "RGB" to get the full 360 Hz. But then trigger 2 goes high for the whole RGB frame. How can I change that?

    Thanks a lot for the support!

    Best,

    Malte

  • Malte,

    Have you tried reviewing the DLP Light Control GUI User's Guide? This may help you with some of your initial configuration questions.

    https://www.ti.com/lit/ug/dlpu074a/dlpu074a.pdf

    Best Regards,

    Philippe Dollo

  • Yes of course I had a look at the User's Guide. While it is absolute possible that I missed something, I did not find any hints how to establish a trigger out for every subframe in the respective paragraph (4.3.1.) of the document. In any case, it would be very kind if you could give me more info on how to properly set up the trigger or point me a little bit more specific where to find that info (e.g. in the above mentioned doc). Thank you very much!

    Best,

    Malte

  • Malte,

    The trigger out2 is set active for the display of each pattern. If you are displaying a RGB pattern, the signal will be high for the entire duration. Please refer to the below to two images for better understanding.

    Regards,

    Mayank

  • That was exactly what I thought in the beginning and just asked to be sure. Your above answer

    "You can use the rising edge of trigger out2 to capture the start of each subframe"

    sounded to me like it is actually possible to get a trigger edge for each color subframe since you used the term "subframe". Sorry for the misunderstanding. Though the answer is a little unfortunate for our application it is still a clear answer.

    Thanks a lot Philippe and Mayank for your support!

    Best regards,

    Malte

  • Malte, 

    Thanks for the confirmation. 

    Regards,

    Mayank