L-4: Late-New Paper: Active-Matrix Operation of Electrophoretic Devices with Inkjet-Printed Polymer Thin Film Transistors

Active‐matrix operation of an electrophoretic device has been achieved with all‐polymer thin film transistors (TFTs). The source/drain, gate electrodes and gate lines of the TFTs were fabricated by inkjet printing with a conductive polymer, polyethylenedioxythiophene (PEDOT). Electrophoretic material was prepared from TiO2 particles suspended in dyed solution, and was microencapsulated in polymer membrane spheres. The microcapsules were sandwiched between the polymer active‐matrix array and a counter electrode. The voltage of each pixel was independently changed by switching the printed polymer TFT, and contrast in the electrophoretic material was successfully obtained.