| 摘要 |
A drive circuit that compensates for the dispersion of the characteristics of drive transistors is disclosed. A switch SW 2 is turned off, and switches SW 1 and SW 3 are turned on. Thereby, a constant current from a constant current source CC 1 is flown in a drive transistor T 1 . Consequently, a gate voltage corresponding to the constant current Is written in the gate of the drive transistor T 1 . Then, the switches SW 1 and SW 3 are turned off, and the switch SW 2 is turned on. Simultaneously, the voltage of a capacitor C 1 on the side of the switch SW 4 is varied according to a signal voltage, and thereby the voltage is added to the gate of the drive transistor T 1 to flow a current corresponding to the signal voltage in the drive transistor T 1.
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