Boost clock generation circuit and semiconductor device

Abstract

A boost clock generation circuit (500) including: a first switch circuit (502) connected between a first power supply line and a first clock output line to which the first boost clock signal is output; a second switch circuit (504) connected between a second power supply line and the first clock output line; a third switch circuit (506) connected between a third power supply line and a second clock output line to which the second boost clock signal is output; and a fourth switch circuit (508) connected between a fourth power supply line and the second clock output line. One of the first and second switch circuits is exclusively turned ON, and one of the third and fourth switch circuits is exclusively turned ON. The level of current drive capability of the first switch circuit differs from the level of current drive capability of the third switch circuit; and the level of current drive capability of the second switch circuit differs from the level of current drive capability of the fourth switch circuit.

Description

technical field [0001] The present invention relates to a boost clock generation circuit and a semiconductor device. Background technique [0002] As a display device, a liquid crystal display device having an electro-optical device is generally used. By assembling the liquid crystal display device in electronic equipment, the miniaturization of the electronic equipment and the reduction of current consumption can be achieved simultaneously. [0003] However, driving a liquid crystal display device requires a high voltage. Therefore, it is in line with the viewpoint of cost reduction to incorporate a power supply circuit that generates a high voltage in a driver IC (Integrated Circuit) (semiconductor device in a broad sense) that drives an electro-optical device. At this time, the power supply circuit has a booster circuit. The boost circuit boosts the voltage between the system power supply voltage VDD on the high potential side and the ground power supply voltage VSS on...

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Problems solved by technology

[0008] Moreover, even if the above-mentioned effect can be obtained, as the number of switching elements increases, the circuit scale for generating the boost clock will increase, and the effect of cost reduction will also be weakened. Therefore, it is necessary to use a simpler structure to generate The boost clock of the charge pump pump circuit to achieve the above effect

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