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Abstract
A new flipped voltage follower (FVF) whose current source is realized by a depletion-mode thin-film transistor is proposed. It is successfully applied to a static voltage-programmed pixel circuit. The new FVF has good adjustable self-compensation (ASC) ability, which makes the pixel circuit can compensate for different threshold-voltage shifts of thin-film transistors in not only the driving but also the FVF circuits. The simulation results show that the proposed pixel circuit exhibits a tiny current variation ranging from 1.69% to 3.80% when “global” transistors shift by ±0.2 V or ±0.3 V. In the experiment, the excellent ASC ability of the new FVF is verified by measuring the voltage transfer curve under ultraviolet exposure. Finally, the proposed pixel circuit exhibits a current variation of 1.4% after a stress time of 40000 s.
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