David Corr

Nanomaterials-Based Electrochromics for Paper-Quality Displays

Electrochromic displays based on nanostructured films modified with electrochromophores are capable of becoming high quality paper-like displays due to their excellent ink-on-paper optical qualities, fast response times, and low power consuming features. The nanostractured films are composed of nanoparticles of a semiconductor, e.g., TiO 3 and other doped metal oxides. The high coloration efficiencies of these devices is due to the use of organic chromophores and the umplification of the color change due to the extremely high surface area of the nanostructured film they are bound to.

Rapid microwave synthesis of mesoporous TiO2 for electrochromic displays

The fabrication of paper quality electrochromic displays based on the viologen modified TiO2 electrodes (Vio2+/TiO2) requires a cost-effective, energy efficient and rapid synthesis of mesoporous TiO2 with high yield in short reaction time. A straightforward and industrially viable process for the preparation of mesoporous nanocrystalline titania (meso-nc-TiO2) for NanoChromics™ display device applications by the use of microwave synthesis is presented here. Spherical aggregates of meso-nc-TiO2 were rapidly achieved using titanium butoxide, deionised water and common alcohols (isopropanol, ethanol and butanol) at comparatively low microwave power intensity (300 W) for 2 min irradiation. The material has been characterised by a range of different techniques such as XRD, Raman spectroscopy, SEM and BET surface area analysis. These materials possess surface areas up to 240 m2 g−1, which is significantly higher than similar traditional sol–gel or commercial samples. This meso-nc-TiO2 prepared was used as the working electrode for an electrochromic display device with Sb doped SnO2 as the counter electrode material on an ITO coated conducting glass. A working prototype of a NanoChromics™ display was successfully fabricated using this approach.

4.5: The Design and Driving of Active‐Matrix Electrochromic Displays Driven by LTPS TFTs

We have successfully driven a high-resolution (200dpi) QVGA active-matrix electro-chromic display (AMECD) with integrated driver electronics fabricated using low-temperature polysilicon thin-film transistor (LTPS-TFT) technology. This non-volatile reflective display requires low operating voltages, and possesses the advantages of high contrast ratio, sharp image quality, very large viewing angle and an image retention of a few days.

P-118: High Resolution Electrochromic Displays for E-Readers

Displays incorporating nanostructured films modified with electrochromic molecules have shown great promise commercially in low information content applications. The materials are amenable to print techniques such as screenprinting and inkjet printing. We report on progress in providing solutions to medium resolution screenprinted displays and high-resolution inkjet printed displays that demonstrate excellent visual quality and superb stability.