Indoor unit of air conditioner and controlling method of the air conditioner

An indoor unit of an air conditioner comprising:

• a housing having an opening;
• a heat exchanger arranged in the housing to heat exchange air drawn into the housing;
• a fan arranged in the housing and rotatable around a rotation axis, the rotation axis formed to extend along a direction toward the opening;
• a controller;
• and
• a diffuser placed at the opening and through which heat exchanged air blown by the fan is discharged,
• wherein the diffuser includes a plurality of vanes configured to guide the heat exchanged air blown by the fan, the diffuser being configured to be selectively rotatable in a same direction as a rotation direction of the fan,
• the plurality of vanes are arranged to guide the heat exchanged air blown by the fan in a rotation direction of the diffuser while the diffuser is rotated,
• the diffuser is arranged to be selectively rotatable in an opposite direction of the rotation direction of the fan,
• the opening includes a first opening and a second opening separately arranged from the first opening,
• the diffuser includes a first diffuser arranged on the first opening and a second diffuser arranged on the second opening,
• the first diffuser and the second diffuser are arranged to be independently rotated, and
• the controller is configured to control rotation of the first diffuser and the second diffuser,
• wherein the controller is configured to control rotation of the first diffuser and the second diffuser by selecting one of:
• a first state in which both the first diffuser and the second diffuser are rotated in the rotation direction of the fan,
• a second state in which one of the first diffuser and the second diffuser is stopped while another of the first diffuser and the second diffuser is rotated in the rotation direction of the fan,
• a third state in which both the first diffuser and the second diffuser are stopped,
• a fourth state in which both the first diffuser and the second diffuser are rotated in an opposite direction of the rotation direction of the fan,
• a fifth state in which one of the first diffuser and the second diffuser is stopped while another of the first diffuser and the second diffuser is rotated in the opposite direction of the rotation direction of the fan, and
• a sixth state in which one of the first diffuser and the second diffuser is rotated in the rotation direction of the fan while another of the first diffuser and the second diffuser is rotated in the opposite direction of the rotation direction of the fan.