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Combining Polymers and Liquid Crystals for Flexible Photonic Devices. John West Kent State University April 22, 2004. Outline. Why Flexible Printed Flexible Cholesteric Displays Printing techniques Polymer walls Stressed Liquid Crystals
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and Liquid Crystals
Flexible Photonic Devices
Kent State University
April 22, 2004
Greg R. Novotny
Ebru Aylin Buyuktanir
Manufactured in a continuous roll-to-roll process
Conventional ITO coated polyester substrates (no barrier coatings, no alignment layers)
Figure 1: A four inch square, 320 by 320 pixel bistable cholesteric display made using flexible polyester substratesFlexible Plastic Bistable Cholesteric Display
West Rouberol, Francl, Ji, Doane and Pfeiffer
Asia Display, 1995
Thermal Print Head
Wax Transfer Sheet
ITO Coated Polyester Film
Tektronix Phaser 240 Wax Transfer Printer
Close-up of the wax pattern printed onto the ITO coated Mylar. The dark lines are the wax pattern.
A replica of the wax resist pattern.
Cholesteric Polymer Mixture
BL 094 92%
NOA 65 8%
* T. Shinomiya, K. Fujimori, S. Yamagishi, K. Nishiguchi, S. Kohzaki, Y. Ishii,
F. Funada, and K. Awane, Asia Display, 255 (1995).
2) Cool to RT with field applied to induce polymer segregation
3) UV expose to form polymer walls
Kim, Francl, Taheri, West,
Appl. Phys. Lett., 72, 2253 (1998).
SEM Image of Polymer Walls
Diagram of Test Cell
Mixture of E44 and Trimethylolpropane tris(3-mercaptopropionate)
at 40 °C
Unidirectionally Oriented Micro-Domains of Liquid Crystal Separated by Polymer Network
For a 22 m film almost all change of the phase retardation occurs below 130V.
The change of phase retardation depends linearly on the applied voltage – simple driving devices
A phase retardation shift of 2 m occurs within 1 ms.
Phase retardation of 0.15 m occurred just in40 microseconds
Possible applications: basic design of an OPA device
Establish a facility for the research and development of flexible electronic devices
Start-Ups bring Innovation and Jobs
Utilize the unique skills in the region in polymers/liquid crystals and printing to spawn a new industry in flexible displays and related electronic devices.