Transparent Film Turns Glass Window Into Projector Screen

Feb 1, 2014
Tadashi Nakamichi, Nikkei Electronics
Butterfly images being projected
Butterfly images being projected
[Click to enlarge image]

Fujifilm Corp announced a transparent material that reflects lights with pre-selected wavelengths and transmits lights with the other wavelengths.

The material, "Wavista," was exhibited at nano tech 2014, a trade show on nano-technologies, which runs from Jan 29 to 31, 2014, in Tokyo.

When a film made of the material is attached to a glass window to reflect lights having red, green and blue wavelengths, the window can be used as a projector screen. The reflectance of the film is almost 100% for lights having pre-selected wavelengths.

The film is expected to be used for various AR (augmented-reality)-related applications. For example, it can be attached to the windshield of a vehicle to realize a head-up display (HUD) and a show window to superimpose digital images on exhibits.

In addition to the capability to reflect lights with pre-selected wavelengths, it is possible to add other functions such as circularly-polarized light separation and diffusion to the film. For example, it becomes possible to check for fine scratches by transmitting only the right-handed circularly polarized light of near-infrared light and take an infrared image covering a wide area by scattering infrared light.

"We made the new material with organic materials, and it does not contain any metal," Fujifilm said. "Therefore, it has a high transmittance for radio waves."

The transmittance is 85% or higher when a base material (film) is used for the functional layer. It is possible to improve transmittance and reduce thickness by removing the base material.