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projection principle when DLP 3010 works in a live streaming mode through HDMI

jun chen3
Prodigy 100 points
Other Parts Discussed in Thread: DLP4500, DLP3010

Hi

We want to connect the DLP 3010 with a camera using HDMI.

In this case, the DLP 3010 can realize a live streaming.

However, the datasheet does not mention the frame rate of this mode.

Could you please tell me that?

Another question is about the projection principle of this mode.

I want to know that the 24-bit RGB image is projected one-bit by one-bit  or in another way.

Here, I suppose it is projected one-bit by one-bit, and we captured the projection screen using high-speed camera working at 5000 fps.

I got 10 green images, five blue images and 5 red images.

Is it correct or not?

Why does it happen?

Thank you for the reply.

  • 0
    TI__Genius 10495 points

    Hello User,

    Thank you for your interest in our DLP Technology.

    The HDMI is running at 60 Hz. We are able to support up to 120 Hz but this would require a firmware change.

    Yes that is correct the input gets loaded bit by bit. Please see below description on how the 24-bit RGB gets loaded.

    A 24-bit RGB input has three colors with 8-bit depth each. Each color time slot is divided into eight bit-planes, with the sum of the weight of all bit planes in the time slot equal to 256.

    Therefore a single video frame is composed of a series of bit-planes. Because the DMD mirrors can be either on or off, an image is created by turning the mirrors corresponding to the bit set in a bit-plane.

    I assume you are seeing with your high-speed camera the series of bit-planes in one frame.

    Please let me know if you have any further questions.

    Best regards,

    Nadine

  • 0 in reply to Nadine Estermann
    Prodigy 100 points
    Hi

    Thank you very much for the reply. It is very useful for me.
    Your assumption is correct, we try to capture the bit-planes.

    Another problem confuses me is that why the numbers of Red, Green and Blue images we captured using 5000 fps high-speed vision are different. I got 10 green images, 5 blue images and 5 red images.
    As you said that a 24-bit RGB input has three colors with 8-bit depth each and each color time slot is divided into eight bit-planes. In this case, the number of captured Red, Green, and Blue images should be the same, right?

    Further, since the sum of the weight of all bit planes in the time slot equal to 256, If we want to capture the LSB of projection, 92592 fps camera should be used, right?
    1000/2.78/256 = 92592 fps.

    Best regards
  • 0 in reply to jun chen3
    TI__Genius 10495 points

    Hello User,

    To achieve the ideal white point for each look we don't have equal amounts of all colors. That is the reason you are seeing 10 green image, 5 blue images and 5 red images.

    A sample rate of 5000 fps is enough to capture the LSB in your system.

    Please let me know if you have any further questions.

    Best regards,

    Nadine

     

     

  • 0 in reply to Nadine Estermann
    Prodigy 100 points
    Hi Nadine

    Thank you for the reply.
    I understood your explanation.

    Another problem is about HDMI streaming.
    My boss told the streaming function can project 24-bit RGB image one-bit by one-bit as a binary pattern with the same time interval.
    By searching the TI community, it seems possible for DLP 4500.
    Is it possible for DLP 3010?
    The software for DLP 3010 seems very simple.
    If possible, please tell me how to realize it.

    With regards
    Jun
  • 0 in reply to jun chen3
    TI__Genius 10495 points

     

    Hello Jun,

    I am not sure if I understand what you would like to achieve. Can you please share some information about your application?

    The DLP4500 EVM has a pattern sequence mode which supports 1-, 2-, 3-, 4-, 5-, 6-, 7-, and 8-bit images with a 912 columns × 1140 rows resolution. These images are pixel accurate, meaning that each pixel corresponds to a micromirror on the DMD and is not processed by any of the video processing functions. It also allows you to synchronize to a camera or external system with the displayed patterns.

    The DLP3010 EVM is not supporting these features.

    Best regards,

    Nadine

  • 0 in reply to Nadine Estermann
    Prodigy 100 points

    Hi Nadine

    I want to send patterns (24-bit or others) to DLP 3010 over HDMI, and project them one-bit by one-bit like projecting patterns those are stored in on-board memory.

    I supposed DLP 3010 can realize it, since it seems possible with DLP 4500. (DLP 4500 can realize it, right?)

    A similar question with DLP 4500 can be found in the following link:

    http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/924/p/435212/1558562?keyMatch=dlp%204500%20streaming%20mode&tisearch=Search-EN-Everything

    From your answer, I noticed the resolution of the pattern should be 912 columns × 1140 rows.

    It is different with the video mode whose resolution is 1280 x 800.

    With regards