Driving Circuit of Organic LED Using Organic TFT

Abstract

In case that a organic EL display is driven by organic thin .lm transistors (TFTs), the characteristics (mobility, contact resistance, parasitic capacitance, ON/OFF ratio, and so on) of an organic TFT are discussed in the most basic pixel circuit or 2TFT circuit which is composed of switching and driving TFTs. Each TFT needs a mobility as high as that of amorphous silicon TFT, but the other characteristics are requested di.erently for each TFT. Attention must be paid on the other characteristics of the mobility although developments of the organic TFTs tends to be focused only on improving the mobility.