• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 28 subscribers
  • Views 170 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

DLPLCR4500EVM: LED current(brightness) setting, while using TIDA-00254

DLPLCR4500EVM: Brightness fluctuation

Liu Yang
Expert 5915 points
Part Number: DLPLCR4500EVM

Hi Team,

Use the DLPLCR4500EVM to illuminate the object.

In Pattern Sequence Mode, we set the following pattern to continue with a single pattern with 60 FPS.

In this case, while the pattern is being irradiated, it is expected to be irradiated with constant brightness.
Actually, there is a brightness fluctuation of 17-18 Hz as follows.

We want to decrease the brightness fluctuation since about 10% of it would effect the measurement.
Is there any way to suppress this amount of brightness fluctuation on DLPLCR4500EVM setting?

Beat Regards,
Tom Liu

  • 0
    TI__Genius 12595 points

    Hello Tom,

    Welcome back to the E2E forum and thank you for your interest in DLP technology!

    There are a couple of questions that I need cleared up to address this:

    1. How is this waveform being measured? Is this with a photo-detector or through some other method?
    2. From your first screenshot it appears that this pattern is being sourced from a video port. Is the same behavior seen when using an internal, all white pattern?

    Regards,

    Austin