Xiang-Dong Mi

16.3: Development of a Flexible Electronic Display Using Photographic Technology

A bistable flexible electronic display has been developed based on photographic technology, processes, and materials. Using photographic film coating techniques, an aqueous cholesteric liquid crystal dispersion, a dielectric layer, and a dark layer were deposited onto patterned transparent conductors on a polymeric web. Second conductors were printed over the active display layers to complete display manufacture in a roll-to-roll process. Simple seven-segment displays and matrix displays have been generated using these techniques. The displays can use contact electronics to eliminate drive cost from the displays. Several prototype applications were demonstrated. Displays produced with these processes were low-cost, thin, flexible, passively driven, and retained an image without an applied electric field.

27.3: Electro‐Optical Cholesteric Sheet Writing

Flexible displays having a polymer dispersed cholesteric layer, a dark layer and a thin electrical conductor have been found to respond to a combination of high-intensity xenon flash energy and electrical field. A variety of writing schemes have been discovered. Simple super-twisted-nematic displays can be used as an imaging mask. The technology further permits dry fingerprint imaging through contact printing.

6.2: Dynamic Driving Schemes for Cholesteric LCDs to Eliminate Data-Dependent Defects

An improved dynamic driving scheme is proposed to eliminate data-pattern-dependent defects in cholesteric LCD images by inserting a framing voltage pulse between each successive selected pixel voltage pulse, such that the effective selection time is independent of the preceding and following non-selected pixel voltages.