| 摘要 |
A voltage-current converting circuit turns on a transistor M 1 a to give a blanking signal to the gate of a transistor M 5 a (PMOS transistor) through capacities C 1 a and C 2 a, and turns on a transistor M 3 a with the transistor M 5 a diode-connected to supply a current from a power source voltage VCC. Next, the voltage-current converting circuit turns off the transistor M 3 a to intercept the supply of the current, and then resets the capacities C 1 a and C 2 a so that the gate of the transistor M 5 a may take a threshold voltage. Next, the voltage-current converting circuit turns off a transistor M 7 a to intercept the current path between the drain of the transistor M 5 a and the ground potential GND. In this state, the voltage-current converting circuit turns on the transistor M 5 a to give the video signal to the gate of the transistor M 5 a through the capacities C 1 a and C 2 a. Next, the voltage-current converting circuit turns on the transistor M 6 a to form a current path between the transistor M 5 a and a signal line data. Then, the voltage-current converting circuit outputs the current generated between the source of the transistor M 5 a and the drain thereof from the source side to the signal line data.
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