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TLC5958: Low Greyscale Improvement - Features

Oz Kocoglu
Prodigy 260 points
Part Number: TLC5958

Hi,

I have the following questions about the TLC5958:

  • How does the low greyscale improvement mechanism work and what are the limits you can set ?
  • Is there a sort of delay function integrated ? If yes, does it rund with GCLK?
  • Is there a possibility to invert the PWM function of the greyscale ?

Thanks and best regards

  • 0
    TI__Genius 14295 points
    Hi, Oz,

    Please refer to the following application note for more details of your first two questions:
    www.ti.com/.../slva645.pdf

    TLC5958 doesn't have the invert PWM function.

    You can also write an email to me if you still have questions.

    If you think this answers your question, please help to click "Resolve".

    Thanks.
    Regards,
    Kenneth
  • 0 in reply to Kenneth Du
    Prodigy 10 points

    Hi Kenneth,

    Thanks for the information provided.

    Unfortunately, I still don't understand the limits (time control limits?) of this control mechanism and how it works. In the document you provided there are only three grades listed: low, medium, high.

    The time resolution of this adjustment is limited by the clock frquency input of GCLK, right?

    Thanks for explanation.

    BR,

    Marcel  

  • 0 in reply to Marcel Severin
    TI__Genius 14295 points
    Hi, Marcel,

    TLC5958 provides some bits for you to adjust the white balance at low grayscale
    condition. Different multiplexing ratio needs different setting: 1. The higher multiplexing ratio is, the higher enhancement needed. 2. The enhancement of G/B should be higher than that of Red color.

    The refresh rate is related to the GCLK frequency and ES-PWM is used to improve the visual refresh rate.

    Thanks.
    Regards,
    Kenneth