| 摘要 |
PURPOSE: To enable the power source system of a display device or the like to cope with a power-saving mode with simple constitution while enabling the display device to perform display. CONSTITUTION: The power source circuit 300 of the display device such as a liquid crystal display device outputs a boosted power source voltage VDD2 at the time of normal operation and generates a non-boosted power source voltage VDD2 lower than that at the time of the normal operation by controlling a switch for changing over the output in the circuit 300 at the time of a power saving mode and supplies the output voltage to the analog system circuits (a D/A conversion circuit 12 and an amplifier 14) of a driving circuit 100 to attain the reducing of power consumption in the analog system circuits. Moreover, the circuit 300 can be changed over to a mode generating the lower power source voltage without performing the off control of the power source at the time of the power saving mode and, also, to a mode performing the off control of the power source by controlling the switch for changing over the output in the circuit 300 and the supplying of clocks for the power source.
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