DLP4500: DLP image issues

Hello Ji-nam,

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

Is your client using the DLPDLCR4500EVM or a custom board? How was the below image obtained? Was this on a different system?

Regards,

Austin

Dear Austin.

Thank you for answer.

My customer uses the same product as DLPDLC45000EVM for control board and projection lens.

Other than that , optical system was designed by them.

Why is the pixel visible only on my customer designed system?

Could you please check it?

If possible , could you please provide to me the solution?

I would grateful appreciate it if you check and let me know

Hi Ji-Nam,

Is your customer using a direct laser or LEDs on the DMD in the custom optical engine?

Does your client care more about the color balance or the diamond shapes appearing?

Regards,

Austin

Dear Austin.

my customer cares about both things.( color balance and Diamond shapes ).

they want to diamond shapes to be invisible and color not separated from the boundary.

and they are input laser through TIR Prism into DMD. 

Ther understand that the color is separated from boundary because of the dispersion , but they do not understand that the diamond shape is visible.

if possible , could you please guide me to the cause and solution? 

i would grateful appreciate it if you  check and let me know.

i hope for your answer.

UniOTech Corp. (Unique Optical Technology)
Address : B313, 17, Techno 4-ro, Yuseong-gu, Daejeon, Republic of Korea, postal code 34013
Tel : +82-42-933-9870~1 / Fax : +82-303-0959-9870 / Mobile : +82-10-5045-9495
Ji-nam Park/ Assistant manager / Website : http://www.uniotech.kr / E-mail : jinam@uniotech.kr
LASER, VCSEL, DETECTOR, LASER DRIVER, SCANNER, LENS & CRYSTAL, DOE & BEAM SHAPER, FIBER OPTIC, 광학설계, 모듈 제작 및 양산, 프로그램 제작

Hello Ji-Nam,

From what is shown here it appears that the optical engine is showing lateral color. This is present in all projection technology but can be made more prominent depending on the wave guide design. The projection lens was likely designed for LEDs and is not for specific laser colors.

What f-number (f/#) is the optical module running? You should likely keep this above f/5 with the laser implementation.

There are some points you may try:

• Defocus lens to increase smoothness and color blending
• Increase source etendue by adding diffuser
• Increase f/# to that diffraction decreases MTF

In general, this issue lies in the customer's optical design. They will need to balance their tradeoffs for MTF, efficiency and coupling.

Regards,

Austin