| 摘要 |
PROBLEM TO BE SOLVED: To shorten a time until a device gets to be usable after a power is supplied to the device.SOLUTION: Upon start-up of a power supply device, a controller boosts a power supply voltage stepwise to a prescribed voltage V1 through a plurality of boosting steps. Further, during boosting to a voltage V1 of the power supply voltage, the controller causes the power supply device to start the supply of the power supply voltage to a driver IC. Further, as soon as the boosting state of the power supply voltage transfers to a final boosting step, or just after the boosting state of the power supply voltage transfers to the final boosting step, the driver IC applies a voltage supplied from the power supply device to an active part.SELECTED DRAWING: Figure 6 |
