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In this paper, we review the state of the art of digital and analog circuits that have been shown in recent years in organic thin-film transistor technology on flexible plastic foil. The transistors are developed for backplanes of displays, and therefore have the characteristics to be unipolar and to possess two gates. The dual-gate architecture is employed to increase the transistors intrinsic transconductance, and to create dual-VT logic. We highlight recent examples of digital and analog plastic thin-film circuits. Furthermore, we give an outlook into new technological evolutions, including thin-film semiconductors with high mobility, the advent of complementary thin-film circuits, and of thin-film electrically re-programmable nonvolatile memory.