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DLPLIGHTCRAFTER: Lightcrafter4500 projecting a sequence at a high speed?

Miguel Ares
Prodigy 10 points

Part Number: DLPLIGHTCRAFTER

Hello,

I am posting an issue about the frame rate of projection with the Lightcrafter 4500. We have uploaded patterns to the projector and then we have built a sequence to be projected in Pattern Sequence mode, through the Lightcrafter 4500 GUI 3.0.1. The patterns included in the sequence have been stored from the buffer number 7 to the buffer number 0, and are patterns of 1bit and 8bit depth. The sequence is being projected in Internal Trigger.

The issue is that we are able to project the sequence in a proper way if the period of each pattern (Pattern Period) is above aprox. 120ms. but, if it is below that value, we have seen that the patterns are somehow superimposed when projected.
It seems that going from buffer to buffer (or maybe even within the same buffer) to "read" and project the patterns of the sequence one after the other at high speed (low pattern period), causes that problem. According to our preliminary tests, this seems to be more critical for the patterns of 8 bit depth. But we aim to project the sequence at a higher speed than our current 120ms per pattern. Any help about that?

Thanks!

  • 0
    TI__Mastermind 20045 points
    Hello Miguel,

    First I would recommend upgrading to the latest GUI which is 3.1.0.

    As far as achieving the maximum pattern rate is concerned please see section 8.4.1 of the DLPC350 datasheet. Specifically in structured light mode, the maximum pattern rate can be achieved by pre-loading the 48 1-bit planes from flash memory, and sequencing them in the desired order with different bit depths. In order to achieve this maximum pre-loaded pattern rate shown in Table 8, it is required to display all the patterns from one 24-bit frame buffer before displaying patterns from the second 24-bit frame buffer. If all displayed patterns cannot fit inside the 48 1- bit plane buffer, the maximum pattern rate cannot be achieved as a load penalty will be incurred when loading one side of the buffer as the other is displayed.

    In short, you should be able to achieve a 120Hz pattern rate if you entirely fit your patterns in the 48-bitplane frame buffer and display them in the correct order. If you have more than 48-bitplanes to display you will not be able to achieve the fastest rate.

    Thanks,
    Kyle