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DLP160CP: Way to measure the normal operation of each mirror in DLP.

Tae Wook Kim
Prodigy 10 points
Part Number: DLP160CP
Other Parts Discussed in Thread: DLPC3421, , DLPA2000, DLPA2005

I am writing to inquire about the way to measure the normal operation of each mirror in DLP.

As you may know, there are unique failure mechanisms investigated like hinge fatigue, hinge memory, stiction, and so on.

Therefore, it is essential to measure the tilt angle or finding the number of non-functional mirrors.

However, I have been having difficulty finding a specific way to measure the tilt angle of each mirror in DLP.

Could you please provide information on the measurement of tilt angle or if you know a test to see if each mirror is functioning properly?

Also, I am wondering if there is a way to determine whether the mirrors are working correctly with the projected image while operating DLP.

Thank you for your time and attention to this matter.

I look forward to hearing back from you soon.

  • 0
    TI__Mastermind 22830 points

    Hello Tae Wook,

    Welcome to DLP forum and thank you interest DLP technology. 

    Mirrors in DMD have only operational wo state - ON or OFF. If a mirror fails, it will either a bright pixel or a dark pixel.  There is no need to measure tilt angle.

    You can use internal test patterns supported by the accompanying controller DLPC3421 to display and check to check if there is any failure. Please refer to DLPC3421 programmers guide for details of internal test pattern.

    DLPC3421 Software Programmer's Guide (Rev. A) (ti.com)

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 10 points

    Dear Vivek

    Thanks to your answer, I know way to check the mirror without measuring a tilt angle.

    but i got questions about measurement of DLP Chip

     1) Is there a way to test DLP Chip or mirror without Controller?

     2) Is there a way to test DLP Chip with only Light Engine(LED Chip + LED Controller)

     3) What kind of test is performed before the DLP Chip is produced and delivered?

     4) If i get EVM Board of DLP160CP, to test the chip, can I replace the new DLP160CP chip with the EVM?

     5) Absolute Maximum Ratings in DLP160CP's Datasheet

         - What does "dew point" mean 81 degrees?

         - Why is the Operating / non-Operating Temperature low as 90 degree?

    regards,

    Tae Wook Kim

  • +1 in reply to Tae Wook Kim
    TI__Mastermind 22830 points

    Hello Tae Wook,

    Tae Wook Kim said:
    1) Is there a way to test DLP Chip or mirror without Controller?

    Complete chipset is required to test the DMD which includes DLCP3421 controller and   power management IC (DLPA2000 or DLPA2005).

    Tae Wook Kim said:
    2) Is there a way to test DLP Chip with only Light Engine(LED Chip + LED Controller)

    You need the drive electronic consisting of the chipset.  

    Tae Wook Kim said:
    3) What kind of test is performed before the DLP Chip is produced and delivered?

    The production test confirm DMD meets the electrical, Image quality specification as listed in the DMD datasheet (section 6).

    DLP160CP 0.16 nHD DMD datasheet (Rev. B) (ti.com)

    Tae Wook Kim said:
    4) If i get EVM Board of DLP160CP, to test the chip, can I replace the new DLP160CP chip with the EVM?

    Typically, optical engine used in EVM has DMD mounted secured and sealed.  Replacing DMD could be time consuming and hardware may not be able withstand frequent replacement.

    Could you please share more details about why you want to test each DMD and what are you testing for?

    Tae Wook Kim said:

    Absolute Maximum Ratings in DLP160CP's Datasheet

         - What does "dew point" mean 81 degrees?

         - Why is the Operating / non-Operating Temperature low as 90 degree?

    The recommended operating dew point is24oC. It is time weighted average dew point.  Absolute maximum rating for dew point implies that at any point of time (operational or storage) dew point should not exceed 81oC otherwise it may do permanent damage to device.

    DMD is MEM device unlike traditional semiconductor.  It is  designed  for consumer application. 

    Regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 10 points

    Thanks for the reply.

    Vivek said: 

    Could you please share more details about why you want to test each DMD and what are you testing for?

    I want to check if the chip works well after heating at 180 celsius for 1 minute.
    I also want to know Why storage temperatures above 120 degrees have a negative impact on the chip.
    (I know Hinge Memory is vulnerable to temperature.)

    Regards,

    Tae Wook Kim

  • 0 in reply to Tae Wook Kim
    TI__Mastermind 22830 points

    We have not tested devices in above condition (heating up to 180C ). We do not have any data to answer this question.

    There are multiple failure mechanisms including hinge memory and moisture. The device could fail for several reasons.

     regards,

    Vivek