Dr. Yoan Kim Profile

Dr. Yoan Kim

at AlphaMicron Inc

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Proceedings Article | 26 March 1999 Paper

Advances in Ch-LCD devices using plastic substrates with conducting polymer

William Fritz, H. Wonderly, Steven Smith, Yoan Kim, Jason Chonko, J. William Doane, Ranganathan Shashidhar, Catherine O'Ferrall, David Cuttino

Proceedings Volume 3635, (1999) https://doi.org/10.1117/12.343862

KEYWORDS: Polymers, LCDs, Electrodes, Liquid crystals, Capacitance, Printing, Particles, Manufacturing, Failure analysis, Reflectivity

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Cholesteric liquid crystal display (Ch-LCD) are lightweight, low power, sunlight readable displays. In addition, they can serve a dual function as pen-input device switch no additional hardware. Because of the unique properties of this technology, Ch-LCDs can be made with plastic substrates thus making the displayed extremely lightweight, compact and unbreakable. We discuss in this paper cent advances in merging Ch-LCD technology with conducting polymer electrodes. Conducting polymer provides potential benefits over the use of the standard display electrode materials, indium tin oxide, by improving the reliability of the display. Furthermore, the potential to print the conducting polymer electrodes could significantly increase manufacturing volume and decrease display cost. We report on scaling display size and resolution by demonstrating a 1/8 VGA Ch-LCD using polypyrrole as the conducting polymer. We fabricated these displays using either a vacuum fill or polymer wall/lamination approach and we discus subsequent failure analysis to determine the cause for the line-outs observed on these displays. We present initial results in determining the suitability for using Ch-LCD technology as a pen-input device. Finally, we discuss initial work towards printing the conducting polymer electrodes to determine the feasibility of printing electrodes on plastic substrates in a roll-to-roll, high volume, low cost process.

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