Polymer-based transistors used as pixel switches in active-matrix displays

A 2-in. active-matrix display was demonstrated, containing 4096 solution-processed polymer-based transistors. By using the polymer-dispersed liquid-crystal display (LCD) effect, this results in a reflective, low-power display with paper-like contrast. The influence of the transistor parameters on the display performance is analyzed by use of a model for charging and discharging of the pixel capacitors. Good agreement was obtained between the model and the experimental data. Scaling behavior allows estimation of the performance required for transistors in a quarter-VGA display. These requirements are met by solution-processed pentacene transistors.