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D4100 frame rate and alpDemo

Feng Zheng
Prodigy 185 points
Other Parts Discussed in Thread: ALP

Hi,

We purchased D4100+DLP 0.55'' XGA DMD. The maximum frame rate achieved is only 22k for binary image, not 32k as advertised. Why is it?

The way I used to determine the max frame rate is using the ALP Demo application as shown below. What does the "uninterrupted" mean here?

Thank you!

Best regards,

- Feng

  • 0
    Prodigy 185 points

    Forgot another question: why "uninterrupted" only works for 1-bit image? As shown in the following figure, if I change the bit depth to more than 1, then the "uninterrupted" mode cannot be selected.

    Thanks,

    - Feng

  • 0 in reply to Feng Zheng
    TI__Guru 54320 points

    Hello Feng,

    First, welcome to the DLP section of the TI-E2E Community.

    I believe that the ALP is using Global Load and Mirror Clocking Pulses (formerly called Resets) which has a max DMD rate around 22.6 k Binary Patterns per second.  Please see Table 4 at the bottom of page 6 in "DLP® Discovery™ 4100 Chipset Data Sheet" --> http://www.ti.com/litv/pdf/dlpu008a.  It shows rates for Global and Phased operation.

    32.5 k Binary Patterns per second uses Phased Load and Mirror Clocking Pulses. This would have to implemented in an FPGA program that is loaded into the USER_FPGA in order to achieve the full 32.5 k patterns per second.  Please note that Phased operation is much like an SLR camera shutter during very high shutter speeds.  The entire image is not displayed simultaneously, but depends on your eye or camera to be open during the "exposure" time to integrate the image.

    You will have to contact Vialux concerning the question about what the "Uninterupted" checkbox means, since this is their software product.

    Fizix

  • 0 in reply to Fizix
    Prodigy 185 points

    Hi Fizix,

    Thank you for your reply! It helps me understand the FPS difference.

    - Feng