Abstract
A highly reliable pentacene TFT backplane for a 6-inch QVGA (320 240) electrophoretic display(EPD) was fabricated on a polyethylene substrate. The threshold voltage shift, a general stress e ect of pentacene TFTs, was avoided by designing the channel width of organic thin lm transistor(OTFT) to be 40 times larger than the channel length. The reliability was also enhanced by employing a passivation layer consisting of a polyvinylalcohol and acryl double layer on OTFTbackplane. The mobility was 0.21 0.03 cm2/Vsec and the on/o current ratio was 3.66 2.72 107, producing an excellent uniformity, with a 10 % variation, over a 6-inch area. The OTFT-EPD panel worked in 5 weeks continuous operation.
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