| 摘要 |
In one embodiment of the present invention, a reset signal changes into a High level in sync with rising and falling edges of a common electric potential. This causes a comparator to be reset in sync with the rising and falling edges of the common electric potential, so that a comparator output signal is maintained in a ground level. Therefore, even if a voltage held by a capacitor is suddenly changed by the inversion of the common electric potential, a wrong comparator output signal cannot be outputted. In a charge pump type power supply circuit having, for the purpose of regulating an output voltage, the comparator that fulfills an offset cancel function by using the capacitor, it is possible to obtain a stable output with little fluctuation without being affected by a change in the common electric potential of a common electrode of pixels in a liquid crystal display apparatus.
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