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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 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.
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Ono et al. (2004) studied this question.
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