DLP4500NIR: DMD total efficiency : LED vs Laser

Uryyy

Part Number: DLP4500NIR
Other Parts Discussed in Thread: DLP4500

Hi,

I'd like to know DMD efficiency as below case.

DMD : DLP4500NIR / Light sources : 780nm LED and Laser

Total Efficiency = Micromirror array fill factor x Micromirror array diffraction efficiency x Micromirror surface reflectivity x Window Transmission

DLP4500NIR datasheet shows array fill factor(92%) and window transmission(96%) but I have not been able to find the array diffraction efficiency and surface reflectivity values. I think these unknown values differ LED and laser. Could anyone please let me know the values in typical case?

Thank you.

over 5 years ago

0 Philippe Dollo over 5 years ago

TI__Mastermind 28005 points

Uryyy,

Please see the footnotes in the DLP4500 datasheet below:

While surface reflectivity can be estimated as that of bulk Aluminum, diffraction efficiency is harder to predict. More information on the use case may be required.

Regards,

Philippe Dollo

0 Uryyy over 5 years ago in reply to Philippe Dollo

Expert 1770 points

Thank you Phillippe,
Is the total DMD efficiency different in LED and laser(LD)? If yes, I would like to know each total efficient values.

0 Hirak Biswas over 5 years ago in reply to Uryyy

TI__Genius 10925 points

Hi Uryyy,

Kindly find the typical values of total efficiency calculated at f/2.4 in the table below.

LASER line at 780nm
	Pixel Pitch	f/#	diff. eff.	ON-state fill	window trans.	mirror refl	total eff.
VSP	7.600	2.400	0.770	0.936	0.956	0.860	0.592
	low window T	2.400	0.770	0.936	0.92	0.860	0.570

LED Spectra at 780nm peak
	Pixel Pitch	f/#	diff. eff.	ON-state fill	window trans.	mirror refl	total eff.
VSP	7.600	2.400	0.770	0.936	0.956	0.860	0.592
	low window T	2.400	0.770	0.936	0.92	0.860	0.570

Hope this helps.

Thanks & Regards,

Hirak.

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DLP4500NIR: DMD total efficiency : LED vs Laser