We report on unique flexible ReflexTM displays based on bistable, reflective, cholesteric liquid crystal display
technology. Reflex displays are attractive for numerous applications because of the low power consumption and paper
like reflective color. As the possible applications grow for flexible, reflective displays the new methods to manufacture
these displays, such as web processing, also become important. We will report on several unique display types such as a
pressure induced writing display and a switchable color electronic skin display. In addition, the current status of
traditional Reflex displays will be discussed.
Flexible Cholesteric liquid crystal displays have been rapidly maturing into a strong contender in the flexible display
market. Encapsulation of the Cholesteric liquid crystal permits the use of flexible plastic substrates and roll-to-roll
production. Recent advances include ultra-thin displays, laser-cut segmented displays of variable geometry, and smart
card applications. Exciting technologies such as simultaneous laser-edge sealing and singulation enable high volume
production, excellent quality control and non-traditional display geometries and formats.
Bistable reflective cholesteric displays are a liquid crystal display technology developed to fill a market need for very low power displays. Their unique look, high reflectivity, bistability, and simple structure make them an ideal flat panel display choice for handheld or other portable devices where small lightweight batteries with long lifetimes are important. Applications ranging from low resolution large signs to ultra high resolution electronic books can utilize cholesteric displays to not only benefit from the numerous features, but also create enabling features that other flat panel display technologies cannot. Flexible displays are the focus of attention of numerous research groups and corporations worldwide. Cholesteric displays have been demonstrated to be highly amenable to flexible substrates. This paper will review recent advances in flexible cholesteric displays including both phase separation and emulsification approaches to encapsulation. Both approaches provide unique benefits to various aspects of manufacturability, processes, flexibility, and conformability.
Holographic retarders based on form birefringence are shown to have controllable dispersion properties. Significantly, we show that the dispersion properties of these retarders can be adjusted over a large wavelength range by varying the periodicity of the index of refraction profile. These retarders with controllable dispersion characteristics are of high value for applications such as the compensation of liquid crystal displays.