Abstract: A sound producing device includes an air pulse generating element and a control unit. The air pulse generating element includes an air chamber, a membrane, a first air entrance and a first valve. The membrane is disposed in the air chamber. The first air entrance is disposed at a side of the membrane in a first direction. The first valve is disposed between the first air entrance and the membrane. The control unit generates a driving signal to control a movement of the membrane, such that the air pulse generating element generates an air pulse in response to the driving signal. During an operation, an first airflow corresponding to the air pulse flows into or flows out of the air chamber through the first air entrance, and passes through the first air entrance substantially along a direction parallel to the first direction perpendicular to the moving direction of the membrane.

Abstract: A sound producing device includes an air pulse generating element and a control unit. The air pulse generating element includes an air chamber, a membrane, a first air entrance and a first valve. The membrane is disposed in the air chamber. The first air entrance is disposed at a side of the membrane in a first direction. The first valve is disposed between the first air entrance and the membrane. The control unit generates a driving signal to control a movement of the membrane, such that the air pulse generating element generates an air pulse in response to the driving signal. During an operation, an first airflow corresponding to the air pulse flows into or flows out of the air chamber through the first air entrance, and passes through the first air entrance substantially along a direction parallel to the first direction perpendicular to the moving direction of the membrane.

Abstract: A sound producing apparatus is provided. The sound producing apparatus comprises a driving circuit, comprising a pulse amplitude modulation (PAM) module, configured to generate an driving signal according to an audio input signal, wherein the driving signal comprises a pulse amplitude modulated signal generated according to the audio input signal, the pulse amplitude modulated signal comprises a plurality of pulses at a pulse rate, two consecutive pulses among the plurality of pulses are temporally spaced by a pulse cycle, the pulse rate is a reciprocal of the pulse cycle, and the pulse rate is larger than a maximum audible frequency; and a sound producing device, coupled to the driving circuit, configured to produce sound according to the driving signal.

Abstract: A sound producing apparatus is provided. The sound producing apparatus comprises a driving circuit, comprising a pulse amplitude modulation (PAM) module, configured to generate an driving signal according to an audio input signal, wherein the driving signal comprises a pulse amplitude modulated signal generated according to the audio input signal, the pulse amplitude modulated signal comprises a plurality of pulses at a pulse rate, two consecutive pulses among the plurality of pulses are temporally spaced by a pulse cycle, the pulse rate is a reciprocal of the pulse cycle, and the pulse rate is larger than a maximum audible frequency; and a sound producing device, coupled to the driving circuit, configured to produce sound according to the driving signal.

Abstract: A sound producing apparatus is provided. The sound producing apparatus comprises a driving circuit, comprising a pulse amplitude modulation (PAM) module, configured to generate an driving signal according to an audio input signal, wherein the driving signal comprises a pulse amplitude modulated signal generated according to the audio input signal, the pulse amplitude modulated signal comprises a plurality of pulses at a pulse rate, two consecutive pulses among the plurality of pulses are temporally spaced by a pulse cycle, the pulse rate is a reciprocal of the pulse cycle, and the pulse rate is larger than a maximum audible frequency; and a sound producing device, coupled to the driving circuit, configured to produce sound according to the driving signal.

Abstract: An air pulse generating element, disposed in a sound producing device, includes a membrane, disposed within a chamber; and a plurality of valves, disposed by the membrane within the chamber, configured to seal a plurality of openings of the chamber in response to a plurality of valve control signals; wherein the membrane and the plurality of valves are all fabricated at a first layer.

Abstract: The present invention provides a sound producing device comprising: an air pulse generating element and a control unit. The air pulse generating element comprises an air chamber and an actuator. The control unit, configured to generate a driving voltage applied to the actuator of the air pulse generating element, such that the air pulse generating element generates a plurality of air pulses in response to the driving voltage. The plurality of air pulses are at a pulse rate, and the pulse rate of the plurality of air pulses is higher than a maximum audible frequency.

Abstract: The present invention provides a sound producing device comprising: an air pulse generating element and a control unit. The air pulse generating element comprises an air chamber and an actuator. The control unit, configured to generate a driving voltage applied to the actuator of the air pulse generating element, such that the air pulse generating element generates a plurality of air pulses in response to the driving voltage. The plurality of air pulses are at a pulse rate, and the pulse rate of the plurality of air pulses is higher than a maximum audible frequency.

Abstract: The present invention provides a sound producing device comprising: an air pulse generating element and a control unit. The air pulse generating element comprises an air chamber and an actuator. The control unit, configured to generate a driving voltage applied to the actuator of the air pulse generating element, such that the air pulse generating element generates a plurality of air pulses in response to the driving voltage. The plurality of air pulses are at a pulse rate, and the pulse rate of the plurality of air pulses is higher than a maximum audible frequency.

Abstract: An air pulse generating element, disposed in a sound producing device, includes a membrane, disposed within a chamber; and a plurality of valves, disposed by the membrane within the chamber, configured to seal a plurality of openings of the chamber in response to a plurality of valve control signals; wherein the membrane and the plurality of valves are all fabricated at a first layer.

Abstract: An air pulse generating element, disposed in a sound producing device, includes a membrane, disposed within a chamber; and a plurality of valves, disposed by the membrane within the chamber, configured to seal a plurality of openings of the chamber in response to a plurality of valve control signals; wherein the membrane and the plurality of valves are all fabricated at a first layer.

Abstract: An air pulse generating element, disposed in a sound producing device, includes a membrane, disposed within a chamber; and a plurality of valves, disposed by the membrane within the chamber, configured to seal a plurality of openings of the chamber in response to a plurality of valve control signals; wherein the membrane and the plurality of valves are all fabricated at a first layer.

Abstract: An air pulse generating element is disclosed. The air pulse generating element includes a front faceplate; a back faceplate; a front supporting element; a back supporting element; a folded membrane, configured to form a front chamber and a back chamber, and comprising a plurality of membrane units; wherein the plurality of membrane units are parallel and sequentially connected and an end of the folded membrane is connected to the back faceplate via the back supporting element and another end of the folded membrane is connected to the front faceplate via the front supporting element; and a plurality of valves controlling a plurality of air flow channels between the front chamber toward either a front space or a back space; wherein the plurality of membrane units are configured to perform horizontal deformation to squeeze air in and out of the front or back chamber with operations of the plurality of valves.

Abstract: Power consumption for driving a liquid crystal display is reduced by connecting together row electrodes that are going through opposite voltage transitions so that the charges would cancel. After such charge cancellation, the respective row electrodes are then driven to respective target potentials by means of drivers. The row and/or column electrodes of the liquid crystal display may also be connected to storage capacitors so that the charges at these electrodes may be stored in the capacitors where the charges stored may be then reused subsequently to drive different electrodes towards target potentials, to reduce power consumption in the subsequent drive of the electrodes to their target potentials.

Abstract: Power consumption for driving a liquid crystal display is reduced by connecting together row electrodes that are going through opposite voltage transitions so that the charges would cancel. After such charge cancellation, the respective row electrodes are then driven to respective target potentials by means of drivers. The row and/or column electrodes of the liquid crystal display may also be connected to storage capacitors so that the charges at these electrodes may be stored in the capacitors where the charges stored may be then reused subsequently to drive different electrodes towards target potentials, to reduce power consumption in the subsequent drive of the electrodes to their target potentials. The row voltage driving waveform is such that the driving voltage steps through two or more voltage increments before reaching a final value for turning on or off one or more pixels. This reduces shadows and improves quality of the display.