Abstract: Provided is a mobile terminal including a display configured to display an image, a window disposed on one side of the display and touchable by a user, a case disposed on the other side of the display from a side surface of the window, and an acoustic element disposed on at least one area of the case. The acoustic element generates sound through air-vibration due to oscillation or transmits sound in a bone conduction manner.

Abstract: Provided is an input device. The input device includes a piezoelectric vibration member; a frame disposed to contact at least one area of the piezoelectric vibration member; and a connection member disposed on one surface of the piezoelectric vibration member. The piezoelectric vibration member detects a pressure applied from the outside to generate a voltage and is vibrated in accordance with a signal applied from an external device.

Abstract: Disclosed is a touch screen apparatus including a frame, a touch screen panel provided inside the frame, and a piezoelectric vibration member provided between the frame and the touch screen panel, wherein the piezoelectric vibration member vibrates in a horizontal direction of the touch screen.

Abstract: Provided is a sound output apparatus. The sound output apparatus includes a first sound output part and a second sound output part disposed to contact at least a portion of the first sound output part, and a case configured to accommodate the first and second output parts.

Abstract: The present disclosure provides a sound output apparatus including a first sound output unit, a second sound output unit spaced a predetermined distance from the first sound output unit, at least one opening defined in the second sound output unit, and a housing for accommodating at least one of the first and second sound output units. Here, the housing has an external diameter that is 100% to 130% of a diameter of the second sound output unit.

Abstract: Provided is a complex device including: a frame in which a predetermined space is provided; a vibration member provided in the frame and generating vibration; and a speaker provided in the frame and generating a sound.

Abstract: Provided is a piezoelectric vibrating module including a case provided therein with a predetermined space, a piezoelectric vibrating member provided in the case, vibrating according to an applied voltage, and including a piezoelectric element; a weight member provided in the case and provided to be in contact with a portion of the piezoelectric vibrating member; and at least one fixing member provided in one region of the piezoelectric vibrating member to contact and fix the weight member.