Active Matrix Driving Organic Light-Emitting Diode Panel Using Organic Thin-Film Transistors

概要

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We developed an active matrix driving organic light-emitting diode (OLED) panel on a glass substrate using two organic thin-film transistors (OTFTs) per pixel, a switching OTFT and a driving OTFT. The OTFTs are bottom contact structures with the high-dielectric constant gate insulator tantalum oxide (Ta2O5, relative dielectric constant of 23) produced by anodization in ammonium adipate solution and with pentacene as the active layer. The $W/L$ (where $W$ and $L$ are the OTFTs channel width and length, respectively) was 400 μm/10 μm for the switching OTFTs and 680 μm/10 μm for the driving OTFTs. The characteristics of the OTFTs were improved by treating the Ta2O5 surface with hexamethyldisilazane (HMDS), so that the field-effect mobility was $2.0\times 10^{-1}$ cm2 V-1 s-1 and the current on/off ratio was $10^{5}$. A green phosphorescent dopant, tris(2-phenylpyridine)iridium [Ir(ppy)3], was used for the OLED layer. The panel had $8\times 8$ pixels and the aperture ratio was 27%. We confirmed a 16-gray-scale representation and a luminance of 400 cd/m2.
2005-06-15