[FMCp3-5L] Full-color Window Display Using Birefringence Colors by OPP Films Which Enable to Make Images Invisible from Back Side
window signage, one-way observation, birefringence color, polarized light control, transparent and colorless
Polarized light on birefringent materials causes interference colors. The authors have researched one-way observable signage which enable to make images invisible from back. We have discovered methods for generating reddish colors by combining transparent films. This has finally allowed us to develop full-color signage.