Sharp Corp developed a 60-inch "moss-eye" type low-reflection film and announced it at SID 2010, the largest international conference on display technologies (thesis number: 60.3).
A moss-eye type low-reflection film is a film with concavities and convexities that measure about 100nm and are arranged in a regular way. Because the refraction index in the depth direction continuously changes, the film hardly reflects light. Therefore, it is expected to be used as an anti-reflection film for digital signage installed outdoors.
This time, Sharp made the moss-eye type low-reflection film by using nanoimprint technology, which is suited for low-cost production. The minimum reflectance of outside light is 0.02%, and the average reflectance is 0.04% or lower. The reflectance hardly has wavelength dependence, the company said. Also, Sharp added an anti-glare function to the surface of the film.
Because of the microscopic concavities and convexities on the surface, moss-eye type low-reflection films are easily contaminated with fingerprints. Sharp said that the new film is also susceptible to fingerprints.
To address this problem, Sharp made it easy to remove fingerprints from the film by employing a resin that has a property equivalent to hydrophilia as a film material.
"Fingerprints can be easily wiped by a wet facial tissue," the company said.