An ultrasonic transducer-embedded organic light emitting diode (OLED) panel having excellent sensitivity and that is capable of providing high frequency output and biometric recognition is provided. An OLED panel may include a substrate, an OLED light emitting part on the substrate, the OLED light emitting part configured to emit visible light, and an ultrasonic output part between the substrate and the OLED light emitting part, the ultrasonic output part including an ultrasonic transducer configured to generate ultrasonic waves according to an excitation voltage. The ultrasonic transducer may be a capacitive ultrasonic transducer or a piezoelectric ultrasonic transducer. An OLED panel may include multiple ultrasonic transducers, and a control system may selectively control one or more ultrasonic transducers of the plurality of ultrasonic transducers based on a determination of whether to implement recognition of a three-dimensional gesture or touch recognition of an object in contact with the OLED panel.

A loudspeaker driver circuit, comprises: at least one input for receiving an input signal; a loudspeaker protection module coupled to the input for receiving the input signal and for generating a modified signal in response to the input signal; an amplifier coupled to receive the modified signal from the loudspeaker protection module and to generate an output signal; an output for outputting the output signal for driving a speaker; and an ultrasonic signal generator, for generating an ultrasonic signal, wherein the ultrasonic signal generator is coupled to the amplifier for applying the ultrasonic signal thereto.

An acoustophoretic system is controlled and driven to attain a desired level of performance. An RF controller and a driver provide a frequency and power to an acoustic transducer, which can be implemented as a piezoelectric element, which presents a reactive load or a complex load. A controller implements a control technique for efficient transducer operation. The control technique can locate a frequency for operation that is at a reactance minimum or maximum for the system to produce a modal pattern and to provide efficient operation of the transducer. A method of detecting a minimum or maximum reactance in a acoustophoretic system used to trap, separate, deflect, cluster, fractionate or otherwise process particles or secondary fluids or tertiary fluids in a primary fluid and utilizing the frequency of the detected reactance to operate the acoustophoretic system.

A miniature rangefinder includes a housing, a micromachined ultrasonic transducer, and signal processing circuitry. The housing includes a substrate and a lid. The housing has one or more apertures and the micromachined ultrasonic transducer is mounted over an aperture. The micromachined ultrasonic transducer may function as both a transmitter and a receiver. An integrated circuit is configured to drive the transducer to transmit an acoustic signal, detect a return signal, and determine a time of flight between emitting the acoustic signal and detecting the return signal.

A loudspeaker driver circuit, comprises: at least one input for receiving an input signal; a loudspeaker protection module coupled to the input for receiving the input signal and for generating a modified signal in response to the input signal; an amplifier coupled to receive the modified signal from the loudspeaker protection module and to generate an output signal; an output for outputting the output signal for driving a speaker; and an ultrasonic signal generator, for generating an ultrasonic signal, wherein the ultrasonic signal generator is coupled to the amplifier for applying the ultrasonic signal thereto.

An ultrasonic sensor in the invention includes an ultrasonic transmitter, an ultrasonic receiver, and a detector. The ultrasonic transmitter transmits pulse-shaped ultrasonic waves to a thin plate to excite the thin plate. The ultrasonic receiver receives direct waves and reflected waves among the ultrasonic waves propagating in the thin plate excited by the pulse-shaped ultrasonic waves, the direct waves propagating only in the thin plate, and the reflected waves radiating outward, then reflected by the object, and returning to the thin plate. The detector detects the object present near the thin plate on the basis of a difference between a time at which the ultrasonic receiver receives the direct waves and a time at which the ultrasonic receiver receives the reflected waves.

A cooling system including a heat load; a supply line supplying a cold coolant to the heat load, wherein the cold coolant receives heat from the heat load and becomes a hot coolant, a return line receiving the hot coolant from the heat load, a transducer generating elliptical ultrasonic waves, and a horn coupled to the receiving line and receiving the hot coolant, wherein the horn conveys the elliptical ultrasonic waves to the hot coolant. The hot coolant, in response to the horn conveying the elliptical ultrasonic waves, undergoes heat loss through convection. Elliptical ultrasonic waves are provided by a transducer combining a longitudinal actuator and a bending actuator.

An End effector is disclosed. The exemplary end effector includes a substrate-supporting body for placing the substrate thereon; and a first array of wave generators disposed in the substrate-supporting body and configured to generate a surface wave to a backside of the substrate.

A dielectric elastomer vibration system includes a dielectric elastomer vibrator with a dielectric elastomer layer and a pair of electrode layers, and a power supply device producing a potential difference across the electrode layers. The vibrator exhibits various modes or regions of relationship between potential difference and deformation induced by the potential difference: a high-response region in which a relatively large deformation is induced; a low-response region of lower-potential difference in which a relatively small deformation is induced; and a low-response region of higher-potential difference in which a relatively small deformation is induced or in which a break point of the dielectric elastomer layer is included. The power supply device produces the potential difference by applying across the electrode layers a vibration signal voltage, which is generated by combining an AC voltage with a bias DC voltage corresponding to a potential difference falling in the high-response region.

A method and system for utilizing electromagnetic energy of a frequency, and/or multiple frequencies, and higher harmonics of those frequencies to disrupt the normal bonding of the fluid molecules and that of mineral structures within the body of the fluid is disclosed. Electromagnetic signals at a frequency, frequencies, and higher harmonics related to the energy absorption/emission profile of the fluid being treated are directed into the fluid through direct or indirect injection and/or induced coupling. The frequency, frequencies, and higher harmonics of the treatment signal, preferably between 0.1 KHz and 1000 MHz, may be changed if the absorption/emission profile of the fluid changes during treatment.