A New Voltage Driving Scheme to Suppress Non-Idealities of Polycrystalline Thin-Film Transistors for AMOLED Displays

Abstract

This paper presents a new voltage driving scheme with current feedback for polycrystalline silicon (poly-Si) thin-film transistors (TFTs) to drive active matrix organic light-emitting diode (AMOLED) displays. The pixel circuit is relatively simple, which is composed of 3 TFTs and 1 capacitor. Circuit simulation results show that the proposed driving scheme can effectively suppress the influence of nonidealities of typical poly-Si TFTs including kink effects, spatial nonuniformity of the electrical characteristics. This method also presents a settling time less than 3 s with panel load of 100 pF/1.5 k at all OLED current levels. Index Terms-Active-matrix organic light-emitting diode (AMOLED), current feedback, low temperature polycrystalline silicon (LTPS), thin-film transistor (TFT).Wenjiang Liu is currently an Assistant Professor with the

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