DLP4710EVM-LC: internal pattern issue

May

Part Number: DLP4710EVM-LC
Other Parts Discussed in Thread: DLP4710LC, DLPC3479

HI Team,

My customer is projecting a sinusoidal pattern like the attached (pattern.png) ad internal pattern.

As result, the projected image has a non-linear transition from black to white as you can see in the figure projection.tif.

projection.tif

Seems to be a jump/gap in the transition around the value of 127. Can you help us to understand why and how to solve it?

Thank you.

Regards,
May

over 3 years ago

0 Vivek Thakur over 3 years ago

TI__Mastermind 23070 points

Hello May,

The DLP4710LC/DLPC3479 firmware has known limitation of gray ramp discontinuity form 127 to 128 i.e light output at 128 gray is lower than a t27. Currently we do not , we don't have fix for it.

Thank you for your understanding.

regards,

Vivek

0 May over 3 years ago in reply to Vivek Thakur

TI__Genius 9880 points

Hi Vivek,

Thank you for the information, customer have follow up questions, please see details below.

Could you please explain where the limitation comes from?
Is it something related to hardware, electronics or firmware?
With more details I can look with my team for a way to fix the problem.

Thank you.

Regards,
May

0 John McKnight over 3 years ago in reply to May

TI__Expert 6935 points

Hello May,

This is a firmware matter.

Thank you for your patience.

Regards,

John

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DLP4710EVM-LC: internal pattern issue