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In order to realize a multicolor display, we tried to pattern three different colors to make pixels by using ink‐jet technology. Light emitting polymer, poly(p‐phenylene vinylene) (PPV), was successfully formulated into inks for ink‐jet printing. Those inks showed a good ink‐jetting behavior and became a good light emitting film. By combining the ink‐jet printing with the self‐patterning ability of the substrate, in which the hydrophilic and hydrophobic region is alternately constructed, an ink droplet can be patterned into the narrow pixel gap of 10 μm with precision of 1 μm order. We developed stacked structures combining PPV with Polyfluorene. It was confirmed that energy conversion from the wider gap layer to the smaller one occurred. As a result, we demonstrated the three color electroluminescence from the small pixels. This is the first demonstration of the fine pixel patterning of the multicolor light emitting polymers by ink‐jet technology.

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 TiO 2 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.

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