Regular touch layers are transparent films placed in front of displays, which reduce the light output (brightness). (oled-info.com)
This beautiful work consists of a image of a boy and an imaginary city on transparent film hung vertically in space above the remains of a sandcastle. (matthewmarks.com)
It looks like a small piece of transparent film with tiny engravings on it, and is flexible enough to be bent into a tube. (sciencedaily.com)