Hi Olivier --

I had a professor once who built large-scale, high-brightness teleprompters using Fresnel lenses (see the first link), and in the patent it lists the supplier of their large-scale Fresnel lenses as DNP Inc. Denmark, so perhaps you could try there (see second link).

From a cursory Google search, I also saw someone's comparison of the Fresnel lenses from several different companies (see third link); these all seemed to have dimensions on the order of tens of centimeters rather than >1m, but perhaps you could check with some of the same suppliers listed in the comparison (3dlens.com, SurplusShed.com, American Science and Surplus, Anchor Optics) and see if any of them are capable of delivering sheets large enough for your needs.

Hope this helps a little bit, ~Eric

https://www.google.com/patents/US6834968

http://www.dnp-screens.com/

http://modulatedlight.org/optical_comms/fresnel_lens_comparison.html

Hi Eric and thanks. But the links 2 and 3 seem not working. Could you check please?

Hi Olivier -- They both work well for me, just requiring that I hit the "Redirect me now" button after clicking on the links. Here they are again, just in case:

https://www.google.com/patents/US6834968

http://modulatedlight.org/optical_comms/fresnel_lens_comparison.html

http://www.dnp-screens.com/

Good luck, ~Eric

Huummm... doesn't work on any of my devices, neither on firefox nor on explorer...probably a problem of connexion quality from Burkina Faso. I will find a way. thanks anyway. (the third one is working now...wait and see)

Hi Olivier -- I sent you a message containing PDF printouts of the first two links, so hopefully this solves the problem. Good luck, ~Eric

Hi Efrain,

Thank you for the info. For interrested people, I sent an email and they don't make lenses that large. But they have a very large choice !