perhaps a sheet of enlightened underneath the LCD with white LED around it. If its not enough power to illuminate your screen, then continue to use your old backlight but put the diffuser on that?
Hi, about time to chime in on this thread.
I’ve built a 42” DSI LCD (my second table) setup which can read FID’s, fingers and objects (thanks Amit) just fine. I’m not using the diffuser anywhere near the LCD. So the system is able to “see” through the LCD without any difficulty.
The setup is like this:
EndLighten XL (IR) ==========
LCD and spacers ------------------
EndLighten XL (BL) ==========
Distance between screen and camera can vary depending on your camera array. Currently I test with one camera but the tech is solid for as many as you can stitch together.
LCD/LED Backlight ==========
The backlight (BL) in this build is two fold. One is a support sheet of EndLighten edge lit with White LED’s. This creates a nice even, somewhat dim visibly diffuse, light condition. I use this instead of a diffuser for both added illumination and to prevent the obvious transparency that an LCD setup without a diffuser suffers from.
The second Backlight is the one pulled directly from the LCD Screen itself with all of it’s diffuser layers intact. I mount the camera for my current build into the lower backlight so only the size of the lens is an issue for interrupting illumination.
The combination is surprisingly successful.
I’ll post more detail on the build after I take some photos tonight or tomorrow.