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How many patterns can be loaded in DLPC300's memory (mDDR) in the LightCrafter?

Divya Reddy
Expert 4500 points
Other Parts Discussed in Thread: DLPC300

It is possible to store 96 bit planes (608*684) for fast pattern mode, which translates to a little over 5MB.  The mDDR memory also stores information for the DMD system like splash screens, sequences, color tables, etc. So not all the 32MB of memory is available for pattern storage.

However, additional 24-bit RGB patterns can be input through the parallel interface at 60Hz rate. These patterns can be stored in SD card or NAND flash with much more storage capacity in the "External Pattern" mode. The DM365 can read the patterns from SD card or NAND flash and input into the DLPC300. This mode is currently not supported in the software and will be offered in a future software revision.

  • 0
    Intellectual 380 points

    Dear Divya,

    We are considering to purchase one of the DMD based projector systems available. We need to be able to project binary frames at 4-5 kHz rate (coming from the PC preferably without additional harware). I understand from some of your replies that an upgrade was expected to the Light Crafter allowing for loading of more than 96 frames (with res. 608/684) on the memory of the device and then projecting them at 4kHz. Has that upgrade already been released? What is the advantage of a CEL5500 system in respect to the Light Crafter. Another possibility of high-speed projection would be to stream 24 binary frames preliminarily encoded in single 24 bit color frame. Is any of these two systems able to decode and then - project these as binary frames at the required speed? Another question is the brightness of the projected images - projecting at maximum rate would it be sufficient to see the image at normal light or just in dark room?

    Thank you for your time,

    Jordanka

  • 0 in reply to Jordanka Tasseva
    Intellectual 310 points

    Hi Jordanka,

    Thanks for your participation on the E2E Community.  I want to follow up in regards to your above questions about the LightCrafter vs CEL5500 Light Engines.  I have a few specification tables I want to reference in order to easily outline the differences between the two light Engines. 

  • 0 in reply to Justin Lemon
    Intellectual 380 points

    Hi Justin,

    Thank you for your reply. Looking forward to your considerations.

    Kind regards,

    Jordanka

  • 0 in reply to Jordanka Tasseva
    Intellectual 310 points

    Hi Jordanka,


    Thanks for the quick reply.  For some reason, it did not post my full reply.  I have some specifications charts for both the CEL5500 & LightCrafter as well as their respective Chipset and a straight-forward Product Comparison Outline.  I'm working with the E2E Team now to see if I can retrieve it somehow.  I will keep you updated. 

    Justin

  • 0 in reply to Justin Lemon
    Intellectual 380 points

    Hi Justin,

    Thank you. I am mainly interested in where stays the limitation to the speed. Both systems support frame rates that are ok for us - LCrafter - 4 kHz and the CEL - 5 kHz binary. As far as I understood in real time transfer from the PC, however, due to limitations of the HDMI's maximum transfer rate, the speed is limited to 1440 Hz binary (speaking for the Light Crafter). From the specifications I understood that on the mDDR can be uploaded and subsequently projected (at 4 kHz) (24x 4) 96 binary frames. Then we can send the next "package of 4 24bit frames" and subsequently project them. However, if I understood correctly there is 1/60 s lag for the buffer to be filled, that practically means that the rate of 4 kHz can not be achieved (since between each 96 binary images, projected at 4k). I don't know if I put it clear. But what I understood is the following: If we want to consecutively upload to the maximum capacity of the buffer 3 sets of (24x4)binary frames and then display them, we wouldn't be able to do this in (3x96/4000) 72 ms but will need (72 ms + 50 ms) for these three sets that is 2360 Hz. If that is correct, my question is: how could that be resolved in order to reach the maximum rate of 4 kHz. And are these 4 kHz limited only by the response time of the DMD chip or also by the process of decoding from 24 bit to binary. In other words, if we don't have a limitation from the graphics card of the PC and can work at for example 200 Hz, does the electronics of the Light Crafter allow for projection of 200x24 binary frames. If not, is that possible with the CEL.

    Many thanks! Have a nice day,

    Jordanka