Flexible vibration cushion and control method for driving the same

A method of controlling a flexible vibration cushion, comprising:

• applying, by a control unit, a target current in the form of a square wave pulse in which an ON section where a current is applied and an OFF section where the current is cut off are repeated to a substrate;
• expanding and protruding forward a central portion of an electroactive polymeric membrane by generating an electrostatic force between an electrode coated on the substrate and a flexible electrode coated on the electroactive polymeric membrane in the ON section;
• and
• contracting and retreating the central portion of the electroactive polymeric membrane to an original position by releasing the electrostatic force between the electrode coated on the substrate and the flexible electrode coated on the electroactive polymeric membrane in the OFF section,
• wherein the central portion of the electroactive polymeric membrane protrudes forward and is retreated to the original position repeatedly so that the vibration is generated.