An electronic device includes a display, a bracket for supporting at least a part of the display, and an acoustic actuator. The acoustic actuator is arranged under the display and includes a vibrating portion for transferring waves to the display and a fixed portion of which at least a part is fixed by the bracket. and the electronic device further includes at least one recess structure of which at least a part is arranged to be spaced from the acoustic actuator. The recess structure is formed to have an acoustic impedance that differs from the acoustic impedance of the bracket which is adjacent to the recess structure.

A display device, including a display panel, a box, a connection frame and a vibration actuator provided on the display panel. The connection frame includes: a frame-shaped member including a first end face and a second end face arranged opposite to each other, the first end face being attached to a top face of the box, a plurality of protrusions being provided on the second end face, a surface of each protrusion away from the first end face forming a support face, and the display panel being fixed on the support face; and a connection member fixedly coupled to the frame-shaped member, and detachably coupled to the box via a fastener.

The flat loudspeaker including an enclosure in the form of a support frame, a sound-emitting rectangular membrane attached to the frame, and an electrodynamic vibration exciter located opposite the membrane. Besides, the vibration exciter is attached with one of its ends to the membrane within a special line passing along the plane of the rectangular membrane, emerging from any vertex of the rectangular membrane, and ending at a point on the opposite vertex of the membrane's horizontal side located at a distance of ⅔ of the membrane's opposite side from the top horizontally.

Electrodynamic drive for a flat loudspeaker having an enclosure where the following components are installed: a magnetic system, a cylindrical coil fixed to the frame, a sound-emitting membrane attached to the cylindrical coil former, a system holding the coil within a magnetic gap, and flexible wires for supplying an electrical signal to the coil. While the magnetic system is made as a cylindrical permanent magnet, a ferrite ring with the above mentioned cylindrical magnet and washers, joining them into a single structure.

The device includes a case, a flat membrane, a drive for acoustic vibrations of the transverse acoustic wave. The case is made in the form of a support frame, and a sound-emitting flat rectangular membrane is fixed to the frame. The membrane is made in the form of a honeycomb layer, a surface layer glued to the honeycomb structure from both sides, and a stabilizing impregnating composition covering the surface layers. The acoustic vibrations drive is made in the form of an acoustic vibration exciter, including ferrite parts of the magnetic circuit. The acoustic vibration exciter is attached with one of its ends to the flat membrane within a special line passing along the plane of the rectangular membrane, emerging from any top of the rectangular membrane, and ending at a point on the opposite top of the membrane's horizontal side located at a distance of ⅔ of the membrane's opposite side from the top horizontally.

Provided are a display device. The display device comprises a display panel displaying an image, a main circuit board disposed under the display panel, a first vibration element attached to a lower surface of the display panel and providing first vibration in accordance with a first vibration signal, a second vibration element disposed on the main circuit board and providing second vibration in accordance with a second vibration signal, and a first vibration driver circuit providing the first vibration signal to the first vibration element, wherein a phase of the second vibration signal is opposite to a phase of the first vibration signal.

A display device includes: a display panel; a bracket disposed under the display panel; a first vibration generator disposed under the display panel, where the first vibration generator outputs sound by vibrating the display panel in a thickness direction of the display panel; and a second vibration generator disposed under the bracket, where the second vibration generator outputs horizontal vibrations by vibrating the bracket in a horizontal direction perpendicular to the thickness direction.

A display apparatus includes a display panel configured to display an image; a plate on a rear surface of the display panel; a rear structure on a rear surface of the plate and configured to support the display panel; a vibration member configured to vibrate the plate; and a first supporting member between a periphery of the plate and the rear structure.

An electrodynamic actuator (1a . . . 1c) for a plate like structure (25) or membrane (2) is disclosed, which comprises a voice coil (7, 7a, 7b), a magnet system (8) and a plurality of arms (17a . . . 17t) coupling the voice coil (7, 7a, 7b) and the magnet system (8) in a movable manner. The arms (17a . . . 17t) are made of a metal with a fatigue strength of at least 370 N/mm.sup.2 or an ultimate tensile strength of at least 1100 N/mm.sup.2. Each of the arms (17a . . . 17t) comprises at least two arm sections (s, s1, s2), which are arranged movable to each other, and which are connected to each other by means of a damping material (18a . . . 18g) with a tensile storage modulus of 0.1-6000 MPa and a tensile loss factor of at least 0.1, each measured at room temperature of 20° C. Moreover the invention relates to speaker (5) and an electrodynamic transducer (26a, 26b) with such an electrodynamic actuator (1a . . . 1c) and a method of manufacturing an intermediate product for such an electrodynamic actuator (1a . . . 1c).

A display apparatus may include a display panel including a display area configured to display an image, and a non-display area, an optical module on a rear surface of the display panel, at least one first sound generator on a rear surface of the optical module, and at least one second sound generator in the non-display area and between the display panel and the optical module.