68.1: Invited Paper: Achieving Graytone Images in a Microencapsulated Electrophoretic Display

Microencapsulated electrophoretic imaging films have been developed for a variety of display applications. These films exhibit an “ink-on-paper” appearance owing to their strong, near lambertian light scattering. Image persistence exhibited by these films allows displays to operate without power outside of image updates. This and their ready incorporation into flexible displays make microencapsulated imaging films attractive for portable devices where readability in a wide variety of lighting conditions, low power consumption, and mechanical robustness are important. This report reviews the basic principles of optical and electronic performance of E Ink's microencapsulated electrophoretic films as well as recent advances in driving methods for achieving high-quality graytone images in highresolution, active-matrix displays.