Abstract
Organic thin-film transistors (OTFTs) have attracted considerable attention in applications for driving flexible e-paper and active matrix organic light-emitting diode (AMOLED) displays. In the systems, the pixel electrode, which connects the bottom electrode of the display media to the drain or source of the switch OTFT in the e-paper display, and the driving OTFT in the AMOLED display, will form parasitic effects with the OTFTs. Through numerical device simulations, it is found that, in the bottom-contact bottom-gate (BCBG) structure OTFT backplane, the presence of the pixel electrode may result in a shift of the transfer characteristics and a significant decrease of the output impedance. Although the DC electrical characteristics of the bottom-contact top-gate (BCTG) OTFTs are not affected by the presence of the pixel electrode, the BCTG structure has a larger parasitic capacitance, which can cause a higher feed-through voltage for performing switching in the e-paper displays.
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