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DMD rolling over

yang jing
Prodigy 80 points
Other Parts Discussed in Thread: DLP7000

constant speed????

  • 0
    TI__Genius 9935 points

    Yang Jing,

    I interpreted your previous question to be about the distinction between:

    1) How quickly do the DMD micromirrors "flip" when moving from one state to the other - "0" to "1" - +12 to -12 degrees?

    2) How quickly can successive frames be displayed?

    I also assume that you are asking about the 0.7" XGA DLP7000 device.

    I cannot interpret your current question: "constant speed????"

    Could you restate or clarify your question? Perhaps then we can answer it.

  • 0 in reply to Pascal DLP
    Prodigy 80 points

    hi:

       Thank you for your reply.I want to know the question is the first one "How quickly do the DMD micromirrors "flip" when moving from one state to the other - "0" to "1" - +12 to -12 degrees?"  yes ,I am sure that I want to ask about the  0.7" XGA DLP7000 device.

    figure 1  mirror rolling from -12°~+12°

    I mean “constant speed” is  uniform velocity，when every mirror roll from -12°~+12°,the  angular velocity of mirror is a constant value W0,as show in figure 1

  • 0 in reply to yang jing
    TI__Genius 9935 points

    Yang Jing,

    The graph you attached does show a fairly linear crossover (implying constant angular velocity) during the mirror transition. Where did you get this graph? Could you share the source? I am pretty sure that it is not a measurement of the DLP7000, but another (older) DMD.

    I would caution you to not base any design decisions on this graph. It may be close to what you would actually see, but we can not guarantee this. The mirror crossover dynamics are based on many factors. There is no data sheet specification for this particular factor. What can be guaranteed are the data sheet specifications, as I answered in a previous message:

    ---

    The crossover time is the time that it takes for a DMD mirror to move from tilted in one direction to the other. Please see the DLP7000 data sheet (available from http://www.ti.com/product/dlp7000) and refer to Table 4. Micromirror Array Optical Characteristics. The crossover time is nominally 16 / max 22 microseconds for this DMD. See footnote (9) "Micromirror Cross Over time is primarily a function of the natural response time of the micromirrors." Note that this is not the same as the switching time - that is the time between successive refreshes of the mirror array. See footnote (10) "Nominal Switching time depends on the system implementation and represents the time for the entire micromirrorarray to be refreshed."

    ---

  • 0 in reply to Pascal DLP
    Prodigy 80 points

    0116.DMD0.7XGA.rar

    hi!

       Thank you for your reply!  I can share  resource with you,I can e-mail for you.

       I am sure this information is for DMD XGA 0.7,please see the  article I give you.the angular velocity of mirrors in DMD  is an very important factor in our project.please give me detailed information.I want to know the process of mirror moving from -12° to +12°.Thank you!

  • 0 in reply to yang jing
    Prodigy 80 points

    hi!

        what do you think of articles I e-mail to you?please give me correct answer as soon as possible! Thank you !

                                                                                                                                         

  • 0 in reply to yang jing
    TI__Guru 54390 points

    Hello Yang Jing,

    I have been working with Pascal on this.  He is on travel, so I will be working with you on this question.

    I have looked over the articles you attached.  The graphs are accurate, but should not be used to design a system against.  The behaviour of any single mirror may vary from the graph.  The graph is simply intending to show the general transient behaviour of a DMD pixel. 

    Are you able to share what you are attempting to accomplish?

    Fizix

     

  • 0 in reply to Fizix
    Prodigy 80 points

    hello Fizix,

            Thank you for your reply.I want to know whether TI test the crossover of every mirror when TI manufacture DMD?  had the mirror tested the trajectory of every mirror,what equipment is used for test?  This trajectory curve is important for our research.please explain mechanical  trajectoryof mirror ,in other word, how does TI corporation acquire this  trajectory  of mirror? our project is about  3D  image.

    yangjing

  • 0 in reply to yang jing
    TI__Guru 54390 points

    Hello Yang Jing,

    The testing is done on groups on mirrors, not individual mirrors.  All mirrors are tested to make sure they are switching, but the trajectory of individual mirrors is not tracked.

    The equipment is proprietary measurement eqjuipment that we have developed.

    If this discussion might reveal too much information in a public forum about your application, please send me a friend request and we can start a private conversation.

    Fizix

  • 0 in reply to Fizix
    Prodigy 80 points

    hello Fizix,

             Thank you for your reply.the problem is not difficult,I just want to know the trajectory of  mirrors.The mirror crossover linearity is OK? in other words,the angular velocity of mirrors is a constant value or a approximate constant value? by the way, I want to know whether TI sell equipment  for testing  trajectory of  mirrors?

              we just start to  get in touch with DMD, and just know less about the properties of DMD,After know more about this information,we want to do some research about 3D image,but now we don't make scheme in detail.

    yang jing

  • 0 in reply to yang jing
    TI__Guru 54390 points

    Hello Yang Jing,

    I regret to inform you that we do not sell equipment for testing mirror trajectory. 

    I think I understand the concept of what you are wanting to acomplish.  If you would like to discuss this further, send me a friend invitation so that we can discuss it.  I believe you are already talking with one of our design houses regarding this.

    Fizix