P‐171: A Flexible Touch‐Sensitive Writing Tablet

Abstract

We present a flexible touch‐sensitive writing tablet utilizing a reflective bistable cholesteric liquid crystal laminated between two conductive‐polymer coated polyethylene‐terephthalate substrates. The device features a selective pressure response suitable for high‐resolution lines to be drawn into the screen. The device is inexpensive, conformable, and laser‐cut to any desired shape.

38‐2: eWriter with Select Erase Functionality

“…Current Boogie Board eWriters are single pixel devices made using flexible substrates that allow pressure from a writing instrument to be transmitted to a polymeric dispersion of cholesteric liquid crystals. The writing pressure of the stylus induces flow in the liquid crystal layer that reorients the liquid crystal molecules from a non-reflecting, scattering focal conic texture to a bright reflecting planar texture [1,2]. The image created by the stylus pressure can be erased by simply applying a small field across the liquid crystal layer to reset the device to a weakly scattering Focal Conic texture, returning it to the color of the absorbing background or pattern [3].…”

P‐136: Large Area, Flexible eWriter for Whiteboard Replacement

“…The eWriter electrooptic layer contains ChLC materials and polymer structure to create good line acuity. [6] The photopolymerized ChLC dispersion results in polymer pillars surrounded by ChLC, allowing the ChLC to flow as localized pressure from a stylus or other pointed device is applied to the top substrate. The pressure induces flow in the ChLC resulting in a written bright line (planar state) on a dark background (focal conic state).…”

Review Paper: A critical review of the present and future prospects for electronic paper

“…12(e)], in which a stable image is written with a stylus and the film reset by a short voltage pulse. 123 Fabrication/environmental: Glass-based cholesteric cells can be built using conventional liquid-crystal-display fabrication techniques. Plastic-based cells can be built on a roll-to-roll basis with microencapsulated or polymer-dispersed cholesteric liquid crystals.…”