Transparent film and substrate technology for touch screens and flexible-display applications

Flexible electronic displays with touch screens are increasingly used in demanding outdoor environments. Design engineers are challenged to develop optical systems that meet a wide thermal range (-40° to +85°C) and comply with diverse optical, electrical, and mechanical parameters. This article describes possible solutions, including transparent thin-film anti-reflective and conductive coatings. Also discussed are technologies being currently employed such as conductive transparent oxides [e.g., indium tin oxide (ITO)], carbon nanotubes, and silver nano-particles. The optical and mechanical properties of substrates used in the fabrication of flexible displays and touch screens are also reviewed.