| 摘要 |
A novel driving method for conducting gradation display is provided. Also, a signal line driver circuit is provided which includes a current source circuit having a small area. Further, miniaturization and reduction in size of a frame of a light-emitting device can be attained. A gate selection period is divided into plural periods, and a (writing) operation of writing a signal to a pixel having a transistor connected with a scanning line that is selected and a (reading) operation of reading a signal current into a current source circuit connected with a signal line connected with a scanning line that is not selected are performed simultaneously in each of the divided periods in the gate selection period. Therefore, the signal line driver circuit that includes a current source circuit having a small area is provided. Consequently, the miniaturization and reduction in size of the frame of the light-emitting device can be attained.
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