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.
We describe the application of smectic A (SmA) liquid crystals for beam deflection. SmA materials can be used in digital beam deflectors (DBDs) as fillers for passive birefringent prisms. SmA prisms have high birefringence and can be constructed in a variety of shapes, including single prisms and prismatic blazed gratings of different angles and profiles. We address the challenges of uniform alignment of SmA, such as elimination of focal conic domains. Fast rotation of the incident light polarization in DBDs is achieved by an electrically switched 90-deg twisted nematic (TN) cell.
We developed a broad band achromatic linear polarization switch for visible and near infrared radiation. The achromatic switch is based on a twisted nematic cell filled with a dual-frequency nematic material. The switch is capable of fast switching linearly polarized light between two orthogonal directions with a switching time in the millisecond range.
We developed a novel technology for the fabrication of reflective cholesteric liquid crystal displays coatable on a single
substrate using a layer-by-layer approach. Encapsulated cholesteric liquid crystals serving as an electro-optical layer and
transparent conducting polymer films serving as electrodes are coated and printed on a variety of unconventional
substrates, including ultra-thin plastic, paper, and textile materials to create conformable displays. The displays are
capable of offering excellent electro-optical properties of the bulk cholesteric liquid crystals, including full-color, IR
capability, bistability, low power, high brightness and contrast, combined with the ruggedness and pressure insensitivity
of the liquid crystal droplets embedded in a polymer matrix. Durability of encapsulated cholesteric liquid crystals and
single substrate approach allows for display flexing, folding, rolling and draping during image addressing without any
image distortion. Our single substrate approach with natural cell-gap control significantly simplifies the fabrication
process of the LCDs especially for large area displays. This paper will discuss the development, status, and merits of
this novel display technology.
We report the nucleation of wave front phase dislocations in a Gaussian beam with initially smooth wave front experienced the self-action in a nematic liquid crystal cell. It is shown experimentally that the structure of the aberrational rings appeared due to inducing of a nonlinear lens in liquid crystal bulk has more complicated character than mentioned earlier.
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