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DLP with Violet LED?

Riccardo Storchi
Prodigy 50 points
Other Parts Discussed in Thread: DLP5500

Dear TI staff

I have a DLP Light Commander. I work in vision physiology and I already used DLP Light Commander for my research.

Now I would like to optimize the spectral content of the images to better fit our specifications. I would need something that has very short wavelength.

I know the optics of DLP are optimized for visible light and there is no warranty for UV light sources as you explained here

http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/387/t/134267.aspx

So:

1) Do you think a Violet LED (instead of a UV) would work with the current DLP optics? 

I found this high power violet multi-dyes LEDs 

http://www.ledengin.com/files/products/LZ4/LZ4-00UA00.pdf

2) They have different electrical characteristics (e.g.need much less current than the PT-54 mounted on DLP). Do you suggest any way of mounting them? 

3) I could not find any schematics of the power supply (the OSRAM RAPCUR) and the Visitech Light Engine mounted on the DLP. If possible could you suggest me a way to find them?

Cheers

Riccardo

  • 0
    TI__Genius 9935 points

    Riccardo,

    As you point out, the DLP5500 DMD used in the LightCommander is spec'd only for 420-700 nm. All of the violet LEDs in the link you provide (I looked at the datasheet) are shorter than 420 nm). So, it would not be within the TI data sheet limits for the DLP5500.

    It may indeed possible to use this LED, but TI can not give any guidance on mounting, or thermal management. You can look at the Luminus Phlatlight PT-54 data sheet (http://www.mouser.com/catalog/specsheets/pt54phlatlight.pdf) to get the mechanical and electrical characteristics of the LED used in the LightCommander.

    The power supply for the Visitech light engine is a 3rd party module, so I do not have the schematics to offer. Since the LZ4 LED you are considering has different current requirements than the PT-54, you would need to match the power supply to the LED requirements. You probably would not want to use the OSRAM RAPCUR driver.

    If you do use the violet LED, you will need to remove the dichroic filters in the Visitech light engine module, and mount the violet LED where the green LED currently is. This will allow a straight-through light path, without attenuation from the dichroic filters used to combine the light from the RGBIR LEDs in the Visitech Light Engine as supplied.

    We are certainly want you to be able to use DLP technology for your application. So, this answer isn't meant, by any means, to stop further discussion of your project. I would encourage you to contact one of our DLP Design Houses (see http://ti.com/mems) to get their help with this adaptation/conversion.

    Best regards,

    Pascal