Mitsubishi Rayon Co Ltd exhibited the "moss-eye film," a non-reflective film that looks like moth eyes, at FPD International 2009, which took place from Oct 28 to 30, 2009, at Pacifico Yokohama, Yokohama City, Japan.
Mitsubishi Rayon developed the film in collaboration with Kanagawa Academy of Science and Technology (KAST).
"We have already achieved the properties (such as reflectance) that had been aimed at," Mitsubishi Rayon said. "And we are now developing a process for volume production, which we are planning to start in 2011."
On the surface of the moss-eye film, protrusions of about 100nm in size are regularly arranged. The refraction index in the direction perpendicular to the film continuously changes, reducing the reflection of light.
The reflectance of the film is 0.1% or less, and the light transmission is 99.6%. The surface hardness is 3 to 4H. Because of the protrusions, the film is water repellent.
Mitsubishi Rayon manufactured the moss-eye film by using a casting mold called "alumina nanohole," which can be made by anodizing aluminum, and imprinting technology. The company applied a technology that has been used for prism sheets for LCD panel backlights to the film.
At the exhibition site, Mitsubishi Rayon showcased the 200mm-wide moss-eye film formed on the center of a 300mm-wide acrylic film.
"We are aiming to develop the moss-eye film that is wider than 600 to 700mm for volume production," the company said.