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DLP4710LC: Coefficient of linear expansion

alex.wang
Prodigy 100 points
Part Number: DLP4710LC
Other Parts Discussed in Thread: DLPC3479

Tool/software:

Hello expert,

In our application, it is necessary to ensure the stability of pixel projection positions. That is to say, a certain pixel needs to always be projected in the same position.

But now we have found that the projection position of pixels changes with temperature. So I would like to ask if there is any definite data that can indicate the amount of change in pixel position with temperature?

If the above data is not available, could you please inform me of the coefficient of linear expansion of the ceramic material on the chip substrate?

Furthermore, I would appreciate some advice and guidance from you regarding the stability of pixel projection.

  • 0
    TI__Genius 9665 points

    Hello Alex,

    Could you please advise what application you using the DLP4710LC in? I'll have to check with my team about this, we may have more questions further.

    I imagine they will have a question about power you are planning to deliver to the DMD as well, please advise this.

    Best,

    Aaron

  • 0 in reply to Aaron Black
    Prodigy 100 points

    Hello Aaron,

    We use the DLP4710LC in 3D reconstruction/3D printing/Digital lithography, and need to keep the pixel movement as small as possible. So, we want to get some information about the drifting of pixel with thermal.

    The luminous flux irradiated onto the DMD is approximately 300 lumens，and the LED-ON duty cycle is about 25%.

  • 0 in reply to alex.wang
    TI__Genius 9665 points

    Hello Alex,

    The CTE of the ceramic header is 7.0 x 10^-6 / ºC.

    With such a low amount of energy going into your system, I don't imagine that heat is going to be such an issue but I'd recommend that you double check that the recommended operational specifications for the DLP4710LC DMD are being met and are definitely not reaching above the absolute maximum values.

    I would also like to ask what your target display size? Also, can you share an image or the defect you are seeing? Is this seen on every layer of a print? Is the error seen on a calibration print? Are the LEDs synced by using the LED_EN signals from the DLPC3479?

    As much information that can be shared is helpful in finding a solution.

    Best,

    Aaron