Patent ID: 8522380

Claim:
A control method of a washing machine, comprising: supplying water and detergent into a water tub to form detergent water; generating air bubbles including the detergent by use of the detergent water, generating the air bubbles comprising injecting the air bubbles into a space between the water tub and the drum through a circulation channel to circulate the detergent water to generate bubbles; dispersing the air bubbles injected into the space between the water tub and the drum into the drum through holes formed in the drum; detecting the level defined by the bubbles, detecting the level comprising detecting frequency variation depending upon the amount of water in the water tub; stopping generation of the bubbles and rotating a drum when the level defined by the bubbles reaches a predetermined bubble detection level; and washing laundry using the bubbles, wherein the air bubbles injected into the space between the water tub and the drum rise to the surface of the detergent water between the water tub and the drum to form bubbles, and the bubbles are dispersed to a lower portion of the drum through the holes formed in the drum while moving up to an upper part of the space between the water tub and the drum.