| 摘要 |
An optical sensor is provided corresponding to a scanning line and a reading line. The optical sensor includes a light-receiving element, a current flowing between both terminals thereof being changed according to the amount of incident light and a transistor whose gate is connected to one end of the light-receiving element, one of a source and a drain being connected to the scanning line and the other being connected to the reading line. In an initialization period in which the scanning line is selected, a predetermined initialization voltage is applied to the gate and, after the application of the initialization voltage ends, a result according to the amount of received light is output based on a voltage on the reading line.
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