Methods, systems, and apparatus for using a two-dimensional distributed mode actuator. One of the systems includes a transducer adapted to create a force to cause vibration of a load to generate sound waves, the transducer having a first width along a first axis; a transfer portion connected to the transducer along a first side parallel to the first axis, and having a second width along the first axis that is less than the first width; and a stub connected to the transfer portion along a second side of the transfer portion that is parallel to the first axis and an opposite side from the first side connected to the transducer, having a third width that is greater than the second width, and having a surface adapted to connect to the load to transfer the force received from the transducer through the transfer portion to the load.

A method, system and devices to selectively control modal vibrations in an elastic panel with a number of force actuators distributed throughout the surface of the elastic panel to excite/depress the response of one or more vibrational resonant modes included in a prescribed subset. The force actuators are disposed such that prescribed modal excitation/depression may be realized when the actuators are driven by a common source signal.

A display apparatus includes: a display module including a display panel configured to display an image, a vibration plate on a rear surface of the display module, a connection member between the rear surface of the display module and the vibration plate, at least one vibration module on the vibration plate, and an enclosure between the display module and the vibration plate, the enclosure being spaced apart from the vibration module, the enclosure surrounding the vibration module.

The present disclosure relates to a display apparatus, especially having a display panel generating sounds. A display apparatus according to the present disclosure includes: a display module; a back cover at a rear surface of the display module; a depression recessed into the back cover from a first surface of the back cover with a first width and a first depth; a penetration through from a second surface of the back cover to the depression with a second width smaller than the first width and a second depth corresponding to a difference between a thickness of the back cover and the first depth; and a first piezo vibration unit disposed at a stepped portion between the penetration and the depression.

Disclosed is a display device that includes a display panel, sound generating actuators including a first sound generating actuator in a first area of the display panel and a second sound generating actuator in a second area of the display panel, the first and second sound generating actuators configured to vibrate the display panel to generate sound, and a partition between the first sound generating actuator and the second sound generating actuator.

Systems and methods of driving plate loudspeakers with different parameters based on frequency region in a way similar to typical cone driver crossover networks are described. These systems and methods may be implemented using arrays of independently controlled drivers which allow a designer to emphasize or de-emphasize certain modes in certain frequency bands. Tuning the characteristics of the plate's motion can also affect the acoustical properties in a larger space rather than just at a single location. The systems and methods described herein can grant a designer a degree of control over the characteristics and performance of the plate.

An electrodynamic actuator (1a, 1b) is disclosed, which is designed to be connected to a plate like structure (2) and which comprises a coil arrangement (3a, 3b) with at least one voice coil (4a, 4b), a magnet system (5) with a movable magnetic circuit part (7, 7a . . . 7f) and a static magnetic circuit part (6a . . . 6F) and a spring arrangement (12) coupling the static magnetic circuit part (6a . . . 6F) to the movable magnetic circuit part (7, 7a . . . 7f) and allowing a relative movement between the same. Both the spring arrangement (12) and the magnet system (5) provide a total restoring force (F.sub.T) directed towards an idle position (P.sub.0) of the movable magnetic circuit part (7, 7a . . . 7f). A part of a total restoring force gradient (ΔF.sub.T/Δz) caused by the magnet system (5) is at least 10% of the total restoring force gradient (ΔF.sub.T/Δz) in said idle position (P.sub.0) of the movable magnetic circuit part (7, 7a . . . 7f). In addition, an output device (17) with the electromagnetic actuator (1a, 1b) mounted to a plate like structure (2) is disclosed.

A flat panel loudspeaker includes a planar resonant panel insertable into an opening in the mounting surface and including a front surface and a rear surface. The front surface faces outward in the mounting surface. The loudspeaker also includes an exciter coupled to the rear surface of the planar resonant panel and a support frame for mounting in the mounting surface. The rear surface of the planar resonant panel is fixed thereto around substantially the whole of the outer boundary of the planar resonant panel. The outer boundary of the planar resonant panel is fixed relative to the mounting surface. The loudspeaker further includes at least one tab configured to extend away from the support frame and be substantially flush with the front surface of the planar resonant panel, which is substantially flush with the mounting surface when the tab is against the mounting surface.

A panel audio loudspeaker includes a panel extending in a plane and an actuator coupled to the panel and configured to couple vibrations to the panel to cause the panel to emit audio waves. The actuator includes a rigid frame attached to a surface of the panel and the frame includes a portion extending perpendicular to the panel surface. The actuator also includes an elongate flexure attached at one end to the portion of the frame extending perpendicular to the panel surface, the flexure extending parallel to the plane and having a first width where the flexure is attached to the frame different from a second width where the flexure is unattached to the frame. The actuator further includes an electromechanical module attached to a portion of the flexure unattached to the frame, the electromechanical module being configured to displace an end of the flexure during operation of the actuator.

A display apparatus includes a display panel configured to display an image, a front member on a front surface of the display panel, a driving circuit on a rear surface of the display panel and connected to the display panel, a supporting frame configured to surround a side surface of the display panel and a side surface of the driving circuit, a first support supported by the supporting frame and on the rear surface of the display panel, and a vibration generating module supported by the first support to vibrate the display panel.