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Proceedings Paper

Current progress and technical challenges of flexible liquid crystal displays
Author(s): Hideo Fujikake; Hiroto Sato
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Paper Abstract

We focused on several technical approaches to flexible liquid crystal (LC) display in this report. We have been developing flexible displays using plastic film substrates based on polymer-dispersed LC technology with molecular alignment control. In our representative devices, molecular-aligned polymer walls keep plastic-substrate gap constant without LC alignment disorder, and aligned polymer networks create monostable switching of fast-response ferroelectric LC (FLC) for grayscale capability. In the fabrication process, a high-viscosity FLC/monomer solution was printed, sandwiched and pressed between plastic substrates. Then the polymer walls and networks were sequentially formed based on photo-polymerization-induced phase separation in the nematic phase by two exposure processes of patterned and uniform ultraviolet light. The two flexible backlight films of direct illumination and light-guide methods using small three-primary-color light-emitting diodes were fabricated to obtain high-visibility display images. The fabricated flexible FLC panels were driven by external transistor arrays, internal organic thin film transistor (TFT) arrays, and poly-Si TFT arrays. We achieved full-color moving-image displays using the flexible FLC panel and the flexible backlight film based on field-sequential-color driving technique. Otherwise, for backlight-free flexible LC displays, flexible reflective devices of twisted guest-host nematic LC and cholesteric LC were discussed with molecular-aligned polymer walls. Singlesubstrate device structure and fabrication method using self-standing polymer-stabilized nematic LC film and polymer ceiling layer were also proposed for obtaining LC devices with excellent flexibility.

Paper Details

Date Published: 3 February 2009
PDF: 8 pages
Proc. SPIE 7232, Emerging Liquid Crystal Technologies IV, 723202 (3 February 2009); doi: 10.1117/12.808148
Show Author Affiliations
Hideo Fujikake, NHK Science and Technical Research Labs. (Japan)
Hiroto Sato, NHK Science and Technical Research Labs. (Japan)

Published in SPIE Proceedings Vol. 7232:
Emerging Liquid Crystal Technologies IV
Liang-Chy Chien; Ming Hsien Wu, Editor(s)

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