Current progress and technical challenges of flexible liquid crystal displays

Hideo Fujikake, Hiroto Sato

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

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. Single-substrate 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.

Original languageEnglish
Article number723202
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume7232
DOIs
Publication statusPublished - 2009 Apr 6
Externally publishedYes
EventEmerging Liquid Crystal Technologies IV - San Jose, CA, United States
Duration: 2009 Jan 252009 Jan 28

Keywords

  • Composite film of liquid crystal (LC) and polymer
  • Flexible backlight using light-emitting diodes (LEDs)
  • Flexible display
  • Liquid crystal
  • Photo-polymerization-induced phase separation
  • Polymer network
  • Polymer wall

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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