Abstract: In a cleaning device, a signal processing circuit determines that a foreign substance has adhered to a surface of a protection cover based on at least two pieces of information among a change amount of a resonant frequency when a vibration portion is driven at a first voltage, a change amount of a current value relating to an impedance detected by an impedance detector, and a temporal change of an image captured by an imaging portion, and cleans the surface of the protection cover by controlling the vibration portion in accordance with the determination.

Abstract: A cleaning device includes a protection cover, a vibrator, a piezoelectric driver, and a signal processing circuit. When the signal processing circuit determines that foreign matter is adhered to a surface of the protection cover, it controls the piezoelectric driver such that vibration of the protection cover has a vibration acceleration of about 1.5×105 m/s2. When the signal processing circuit determines that the foreign matter is adhered to the surface of the protection cover when control of the driver such that vibration of the protection cover has a prescribed vibration acceleration, the protection cover is warmed with a warmer. After the protection cover is warmed, the signal processing circuit controls the piezoelectric driver such that vibration of the protection cover has a resonant frequency.

Abstract: A vibration device includes a light-transmissive body, and a vibrator to vibrate the light-transmissive body at a vibration acceleration of equal to or more than about 1.5×105 m/s2 and equal to or less than about 8.0×105 m/s2.

Abstract: A cleaning device includes a protection cover, a vibrator, a piezoelectric driver, and a signal processing circuit. When the signal processing circuit determines that foreign matter is adhered to a surface of the protection cover, it controls the piezoelectric driver such that vibration of the protection cover has a vibration acceleration of about 1.5×105 m/s2. When the signal processing circuit determines that the foreign matter is adhered to the surface of the protection cover when control of the driver such that vibration of the protection cover has a prescribed vibration acceleration, the protection cover is warmed with a warmer. After the protection cover is warmed, the signal processing circuit controls the piezoelectric driver such that vibration of the protection cover has a resonant frequency.

Abstract: A current sensor that outputs an output signal according to a signal magnetic field that is generated by a current to be measured is provided. The current sensor includes at least one magnetic sensor, a temperature sensor, an amplifier, and an offset adjusting circuit. The magnetic sensor generates a sensor signal commensurate with the signal magnetic field. The temperature sensor detects an ambient temperature. The amplifier amplifies the sensor signal at an amplification rate commensurate with the detected temperature and generates the output signal. The offset adjusting circuit adjusts an offset of the output signal. The offset adjusting circuit adjusts an offset in accordance with a relationship (mathematical expression) that holds between an output signal under no signal magnetic field and an amplification rate corresponding to the temperature.

Abstract: A vibration device includes a tubular body with a cavity, a first opening end surface, and a second opening end surface, a piezoelectric device joined to the first opening end surface, and a translucent cover joined to the second opening end surface. The tubular body and the piezoelectric device are joined to each other with a first adhesive layer, and the tubular body and the translucent cover are joined to each other with a second adhesive layer.

Abstract: A magnetic sensor senses a magnetic field in a predetermined magnetic sensing direction. The magnetic sensor includes a chip on which at least one magnetic device is provided. The length of the chip in the magnetic sensing direction is twice or more the length of the chip in an orthogonal direction that is orthogonal or substantially orthogonal to the magnetic sensing direction.

Abstract: A current sensor outputs an output voltage in accordance with a magnitude of a current to be measured. The current sensor includes a conductor through which a current flows, magnetic sensors, and correctors. The magnetic sensors detect a strength of a magnetic field generated by the current and output an output voltage corresponding to the strength of the magnetic field as the output voltage from the current sensor. The correctors each correct fluctuations in magneto-electric conversion gains of the magnetic sensors caused by a change in an ambient temperature and fluctuations in the output voltages from the magnetic sensors caused by deformation of the conductor due to a change in the ambient temperature.

Abstract: In a cleaning device, a signal processing circuit determines that a foreign substance has adhered to a surface of a protection cover based on at least two pieces of information among a change amount of a resonant frequency when a vibration portion is driven at a first voltage, a change amount of a current value relating to an impedance detected by an impedance detector, and a temporal change of an image captured by an imaging portion, and cleans the surface of the protection cover by controlling the vibration portion in accordance with the determination.

Abstract: An organic EL display device includes: a pixel circuit drive unit configured to drive pixel circuits while performing a property measuring process in which a property of circuit elements is measured; a parameter table configured to store parameter values derived from monitoring data obtained in the property measuring process; a compensation computation unit configured to correct externally provided image data based on the parameter values stored in the parameter table, so as to generate a digital video signal to be fed to the pixel circuits; a temperature sensor configured to sense temperature; and a monitoring control section configured to control an execution frequency of the property measuring process in accordance with the sensed temperature. The monitoring control section increases the execution frequency of the property measuring process with an increase in the sensed temperature.

Abstract: An organic EL panel 10 is a bendable display panel including a plurality of pixel circuits 60 each having a light emitting element and a drive element. A data line drive circuit 15 performs, by driving data lines, an operation of writing a voltage to a control terminal of the drive element and an operation of measuring a current flowing through the drive element for the pixel circuits 60 selected by a scanning line drive circuit 14. A bending detection unit 90 detects a bending state of the organic EL panel 10 based on a measurement result of the current flowing through the drive element. A correction unit 80 corrects a video signal VS1 based on the detected bending state. With this, the bending state of a screen is detected and a change in brightness or color when the screen is bent is prevented.

Abstract: In a current measurement period set in a pause period, a display device of the present invention applies measurement voltages to data lines (S1 to Sm) and measures currents outputted to monitoring lines (M1 to Mm) from m pixel circuits (18), and then applies data voltages generated corresponding to video signals to the data lines (S1 to Sm).

Abstract: A magnetic sensor senses a magnetic field in a predetermined magnetic sensing direction. The magnetic sensor includes a chip on which at least one magnetic device is provided. The length of the chip in the magnetic sensing direction is twice or more the length of the chip in an orthogonal direction that is orthogonal or substantially orthogonal to the magnetic sensing direction.

Abstract: A current sensor that outputs an output signal according to a signal magnetic field that is generated by a current to be measured is provided. The current sensor includes at least one magnetic sensor, a temperature sensor, an amplifier, and an offset adjusting circuit. The magnetic sensor generates a sensor signal commensurate with the signal magnetic field. The temperature sensor detects an ambient temperature. The amplifier amplifies the sensor signal at an amplification rate commensurate with the detected temperature and generates the output signal. The offset adjusting circuit adjusts an offset of the output signal. The offset adjusting circuit adjusts an offset in accordance with a relationship (mathematical expression) that holds between an output signal under no signal magnetic field and an amplification rate corresponding to the temperature.

Abstract: In a data line drive/current measurement circuit, m measurement units are disposed in a plurality of semiconductor chips such that the m measurement units are distributed among the plurality of semiconductor chips. A display apparatus includes transistors such that one transistor is provided for two adjacent semiconductor chips. Inter-chip correction data indicating a variation among the semiconductor chips in terms of characteristics of elements in the measurement units is determined based on a result of a current measurement performed for the same transistor using measurement units disposed in different semiconductor chips. The inter-chip correction data is stored in a storage unit and is used in correcting an image signal. The inter-chip correction data may be determined based on a result of measuring a current flowing through a common cathode of organic EL elements for each semiconductor chip.

Abstract: A display device that is configured to include two independent shift registers and is capable of performing a monitoring process without causing the degradation of display quality or the occurrence of abnormal operation is implemented. In a display device including: a writing control shift register composed of a plurality of first unit circuits (30) each including a first boost circuit (320) and a first output node reset circuit (330); and a monitoring control shift register composed of a plurality of second unit circuits (40) each including a second boost circuit (420) and a second output node reset circuit (430), current drive capability of the first boost circuit (320) is higher than current drive capability of the second boost circuit (420), and current drive capability of the second output node reset circuit (430) is higher than current drive capability of the first output node reset circuit (330).

Abstract: A measurement circuit includes a plurality of measurement units, performs, at a same timing, a main measurement for measuring a current or a voltage with respect to a pixel circuit with supplying a measurement voltage to a part of the measurement units and a dummy measurement for measuring a current or a voltage with supplying a dummy signal to remaining measurement units, and performs a calculation on a result of the main measurement and a result of the dummy measurement. As the dummy signal, a signal with which a value to be measured is approximately zero is used. The measurement result of the current or the voltage is used for correcting a video signal. With this, a display device which can remove noise in measurement when measuring the current or the voltage with respect to the pixel circuit is provided.

Abstract: A detection/correction output circuit of a data-line driving circuit is provided with a transimpedance circuit including an operational amplifier and a current-detection transistor to detect a driving current that has passed through a driving transistor in a pixel circuit. The output voltage of the operational amplifier is amplified by using resistance elements connected in series. Thereby, it is possible to compensate the threshold voltage of the driving transistor with high accuracy by establishing a prescribed relationship between the gain of the driving transistor and the gain of the current detection transistor (by matching both gains) even if there is a difference between both gains. The output voltage of the operational amplifier may be amplified using a non-inverting amplifier circuit.

Abstract: The organic EL display device includes: a current monitoring section that measures a current flowing in a circuit element and outputs a digital measured value in accordance with the measured current; and an averaging section (36) that calculates an average value of a plurality of input values. The current monitoring section measures the current flowing in a circuit element in each pixel circuit a plurality of times in a fixed amount of time. For each pixel circuit, the averaging section (36) receives a plurality of measured values outputted from the current monitoring section in a fixed amount of time as a plurality of input values and outputs an average value of the plurality of digital measured values as a value for use in compensation computation to compensate for degradation of the circuit element.

Abstract: When a display mode is a high-resolution mode, image display is performed by time division driving. When the display mode is a low-resolution mode, image display is performed by defining j pixel circuits arranged continuously in a direction in which scanning signal lines extend as one group, bringing only one organic EL element into a light-emitting state in each of the pixel circuits in a frame period, and bringing organic EL elements having respective light emission colors different from one another into a light-emitting state in the j pixel circuits included in each group in the frame period. Pixel circuits in a display unit are configured such that the intervals of organic EL elements which go into a light-emitting state in the frame period when in the low-resolution mode are equalized regarding a direction in which the scanning signal lines extend.