Polymer and Blue Phase Liquid Crystal Composites for Field-Induced Color(FIC)
Abstract: Light efficiency in current transmissive type flat panel displays is decreased by absorption of the polarizer; and particle-based reflective displays including electrophoretic displays, quick-response-particle displays and electro wetting displays have their brightness dimmed due to the light absorption of color filters. We have demonstrated a new electro-optical device for field-induced color (FIC) based on a polymer-stabilized blue phase (PSBP) liquid crystal display. Applying an electric field across the cell results in a red shift in Bragg reflected wavelength. The color tuning is reversible and with a wide color range capable of covering the visible spectrum. Due to the advantages and ability of controlling the electrically-switched colors, one can fabricate devices for application without alignment layers, color filter, and polarizers. The polymer-stabilized blue phase mode technology is also an eco-friendly technology and can help display companies both reduce their environmental impact and deliver cost savings.
Applications: Formulation of materials, process, and fabrication of polymer-stabilized blue phase liquid crystal devices
Described for generation of color images – to provide:
- Improved electrically-tunable color displays –
o Improved transmissive display technology – greater light efficiency
o Improved reflective display technology – brighter color
- Improved optical filters
- Improved new generation electro-optical devices and active optical elements
- Energy saving – greater light efficiency
- Fast switching, reversible color tuning, and brighter color
- Better temperature stability at operation range
- Better control and manipulation of optical properties – without alignment layers, color filters, polarizers.
Inventors: Dr. L. C. Chien and Shin-Ying Lu
Associate Director, Technology Commercialization
Office: 330-672-3553 Fax: 330-672-7991