| 摘要 |
A display panel driver has a battery, a controller for monitoring the power source voltage supplied from the battery and outputting a control signal in accordance with the power source voltage, a voltage step-up circuit for stepping up the power source voltage supplied from the battery by a factor specified by the control signal, and a display panel driver circuit for producing signals for driving a display panel from the voltage outputted from the voltage step-up circuit. The voltage step-up circuit includes an input terminal for receiving the power source voltage, an output terminal for outputting a stepped-up voltage, a plurality of switching devices connected in series between the input terminal and the output terminal, a plurality of capacitors each connected, at one end, to the output electrode of one of the switching devices, a first circuit, connected to the other end of each of the capacitors, for setting the other end of two adjacent ones of the capacitors at two different binary levels in accordance with the control signal, and a second circuit for turning on and off the switching devices in accordance with the control signal.
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