Provided are an actuator fixing device and a panel vibration type sound-generating display device including the same. A display device includes: a display panel configured to display an image, a cover bottom configured to cover the display panel, and a plurality of sound-generating actuators supported by the cover bottom, the sound-generating actuators being configured to vibrate the display panel to generate sound, at least two of the sound-generating actuators being adjacent to each other.

A loudspeaker diaphragm includes a main material containing molecules each having a hydroxyl group, and a diamondoid derivative. The diamondoid derivative contains molecules each having two or more hydrogen-bonding functional groups. Each of the two or more hydrogen-bonding functional groups in each of the molecules of the diamondoid derivative is bonded to the hydroxyl group in each of the molecules of the main material.

The method can include depositing a graphene oxide containing material from solution to form a laminar nano-structure of graphene oxide paper, and assembling at least a portion of the graphene oxide paper as a diaphragm of the acoustic transducer. The acoustic transducer can be a magnetic induction based microphone, a diaphragm loudspeaker, or a magnetic induction based loudspeaker, for instance.

Provided is a sealed dual membrane (SDM) structure and a device including the same. The SDM structure according to the present invention includes a substrate, a first vibrating membrane and a second vibrating membrane disposed on the substrate, which form a sealed cavity together with the substrate, a first back electrode plate and a second back electrode plate disposed between the vibrating membrane and the second vibrating membrane, and a conductor plate unit disposed between the first back electrode plate and the second back electrode plate. The first vibrating membrane and the second vibrating membrane are mechanically coupled to the conductor plate unit, and the conductor plate unit forms a capacitor structure with each of the first back electrode plate and the second back electrode plate. The present invention reduces the number of pillars required in the SDM structure and increases the sensitivity of the device including the SDM.

A diaphragm is provided, including a dome and a suspension extending from a periphery of the dome. The dome includes a stack of an aluminum foil layer, a foam layer and a carbon fiber layer. The dome is recessed from the aluminum foil layer toward the carbon fiber layer to form a receiving recess. The receiving recess is arranged surrounding the periphery of the dome. The suspension is partially received in the receiving recess and is fixed to the dome. A sounding device is also provided, the sounding device includes the diaphragm. The diaphragm and the sounding device of the present disclosure have better high frequency acoustic performance and excellent reliability.

The present disclosure provides a speaker. The speaker includes a frame, a vibrating diaphragm held in the frame, and a voice coil located below the vibrating diaphragm and configured to drive the vibrating diaphragm to vibrate to produce a sound. The speaker further includes a heat insulation material layer sandwiched at a junction between the vibrating diaphragm and the voice coil. According to the speaker in the present disclosure, the heat insulation material layer is additionally disposed between the vibrating diaphragm and the voice coil. The heat insulation material layer can prevent or reduce heat transferred by the voice coil to the vibrating diaphragm when the voice coil works, thereby reducing creeping of the vibrating diaphragm caused by heat and reducing a change in F.sub.0. This increases a frequency response and improves acoustic performance of the speaker.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for selecting distributed mode loudspeaker electrodes using an output frequency. One of the methods includes determining, for a piezoelectric transducer, a subset of frequencies, from a range of frequencies, at which to output a sound; selecting, based on the subset of frequencies, one or more electrode pairs from two or more electrode pairs included in the piezoelectric transducer to generate the sound; and providing, by a drive module connected to each of the two or more electrode pairs, current to each of the selected one or more electrode pairs to cause the piezoelectric transducer to generate a force that, when provided to a load, causes the load to generate the sound within the subset of frequencies.

Provided are an actuator fixing device and a panel vibration type sound-generating display device including the same. A display device includes: a display panel configured to display an image, a cover bottom configured to cover the display panel, and a plurality of sound-generating actuators supported by the cover bottom, the sound-generating actuators being configured to vibrate the display panel to generate sound, at least two of the sound-generating actuators being adjacent to each other.

Embodiments of the present invention relate to microphones diaphragms. In one embodiment, a sensor comprising a diaphragm comprised of a composition having a plurality of individual graphene sheets. An emitter formed in a manner to transmit lights towards a surface of the diaphragm. A collector that captures at least a portion of light that is reflected by the diaphragm. A converter is in communication with the detector that converts a signal that is generated by the sensor to a digital signal for processing. The graphene-based composition includes graphene sheets.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for selecting distributed mode loudspeaker electrodes using an output frequency. One of the methods includes determining, for a piezoelectric transducer, a subset of frequencies, from a range of frequencies, at which to output a sound; selecting, based on the subset of frequencies, one or more electrode pairs from two or more electrode pairs included in the piezoelectric transducer to generate the sound; and providing, by a drive module connected to each of the two or more electrode pairs, current to each of the selected one or more electrode pairs to cause the piezoelectric transducer to generate a force that, when provided to a load, causes the load to generate the sound within the subset of frequencies.