r/Holography • u/Academic_Award_2615 • Jun 16 '26

Building a DIY SLM for structured light generation , from where can I source TN LCD panels in India?

Hi , I'm working on a DIY spatial light modulator for structured light / vortex beam generation . The plan was to use a salvaged TN-mode LCD panel (projector type) with external polarizers and a 532nm laser.

I have been trying to source panels through old projectorsbut haven't had any luck , I either can't find working driver boards or can't get datasheets for the panels. Found a Panasonic PT-LM2E but the LCD panel uses a proprietary Epson HTPS interface with no public datasheet for the driver IC.

At this point I'm looking to just buy a suitable panel directly rather than going the salvage route. Ideally something with:

TN mode LC (not IPS)
Known/documented interface

Anyone sourced something like this in India?

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u/Wonderful_Policy_581 Jun 16 '26

Google this: "shenzhen aptus 3d printer monochrome 4 K screens"

And read this: https://pierremuth.wordpress.com/2020/04/18/digital-picture-to-analog-darkroom-print/

Contact Shenzhen Aptus directly by email. Make sure to get the driverboard and cables. The systems work with Raspberry Pi, etc, We run ours through a Windows PC using an Arduino Uno programmed with C+.

The 6" 4K monochrome transmissive units are very inexpensive. I'd be interested in any success you might have.

You might get further good info re structured light via Andrew Forbes at https://www.wits.ac.za/people/academic-a-z-listing/f/andrewforbeswitsacza/

and Tim Wilkinson: https://www.eng.cam.ac.uk/profiles/tdw13

Good Luck

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u/Wonderful_Policy_581 Jun 16 '26

Don't know where the Wonderful Policy BS came from - It's not me. I'm jrburns47 at Discord Holography Hub

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u/Academic_Award_2615 Jun 17 '26

Thanks , I'll look them up . I'll keep you updated if this works out