Disclosed are layered films having a combination of piezoelectric layers
that change dimension with applied voltage and non-piezoelectric layers.
The layered structures can form a wide range of electrically switchable
optical films. These films have applications in displays, polarizers,
optical compensators, aesthetic films, and "hot" and "cold" mirrors that
selectively reflect only certain wavelengths. Also disclosed are
monochromatic and multicolor displays using these films.