I think it might be worth modifying the design in the previous method using two sheets of Endlighten instead of one. The layer on top is the sheet of Endlighten filled with IR which serves as the multitouch vessel and the protection for the LCD. A sheet of acrylic on top was already a requisite for this design anyways. The sheet of Endlighten below is only filled with white light to serve as a backlight.
This solves the problem of accidental reflected infrared in the previous design. Infrared from rear-LCD layer will be reflected off the mirrored back surface of the LCD washing out the image to the sensor array (or the camera if we are still using one) which requires more image manipulation on the software side to get good blobs. Keeping the IR above that reflective surface could prevent this.
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