Evaluation of a privacy film using an automated absolute reflectance measurement accessory

A privacy film which is used for smartphone displays has a characteristic structure in which clear layers and light shielding layers are interlaminated. This structure in the smartphone display prevents bystanders from ”peeking” at the screen while the viewing angle depends on the height and pitch of the light shielding layers in the lower layers.

To evaluate the viewing angle or the transmittance of the louver layer, an absolute reflectance measurement accessory is an effective tool. The accessory can be used to set samples at a specified angle by rotating the sample to the source incidence and/or detector angles.

In this application, the angle dependence of the transmittance spectra of the privacy film for a smartphone is explored