| 摘要 |
An electrooptical device is provided in which lowering of the frequency characteristic due to a large power external switch connected to an opposite electrode is prevented to avoid reduction in number of gray scales. In an electrooptical device having a plurality of source signal lines, a plurality of gate signal lines, a plurality of power supply lines, a plurality of power controlling lines, and a plurality of pixels, each of the plural pixels has a switching TFT, an EL driving TFT, a power controlling TFT, and an EL element, and the power controlling TFT controls the difference in electric potential between an anode and cathode of the EL element.
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