Four-Thin-Film-Transistor Pixel Circuit for Amorphous-Silicon Active-Matrix Organic Light-Emitting Diode Displays

概要

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Voltage-controlled pixel circuit with four thin-film-transistor (TFT) for amorphous-silicon (a-Si) active-matrix organic light-emitting diode (AM-OLED) displays has been designed, simulated and evaluated. Deviation and aging of the properties of the driver-TFT cause image sticking or degradation of image quality. These problems require compensation for high-quality display applications, and a pixel-level compensation circuit is one of the solutions. In this paper, we propose a novel and suitable circuit for a-Si AM-OLED displays. The circuit is composed of four TFTs and a storage capacitor, and its driving scheme has four periods: preparation, programming threshold voltage ($V_{\text{T}}$), writing data, and emission. It is possible to set a long detection time for the threshold-voltage of driver-TFT in each pixel, so it can compensate precisely for deviations and the aging of the threshold voltage.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-12-15