Fujifilm also sought new outlets for its expertise in film: for example, making optical films for LCD flat-panel screens.

ECONOMIST: Technological change

It includes optical films for computer monitors, televisions, and hand-held electronics.

FORBES: Post-Its Still Yield In Digital Age

But, starting in the nineteen-thirties, music soundtracks were added to silents, and the films needed to move through the projector at twenty-four frames a second, so that the optical sound reader could handle the music track.

NEWYORKER: The Artists