Patent application number | Description | Published |
20090002281 | ACTIVE MATRIX ORGANIC ELECTROLUMINESCENCE DISPLAY AND ITS GRADATION CONTROL METHOD - An active matrix organic electroluminescence(EL) display comprises plural selection and data lines mutually crossed, and a pixel circuit connected to the selection and data lines and having switching devices, a storage capacitor and an organic EL device. In a part of a period that the pixel circuit connected to the selection line is being selected, an applied first data signal is held as a voltage at the storage capacitor of the selected pixel circuit. After the selection signal applying, a first current according to the held voltage is supplied to the organic EL device, and this emits light at luminance according to the first current. In another part of the period, a second current according to an applied second data signal is supplied to the organic EL device of the selected pixel circuit, and this emits light at luminance according to the second current. | 01-01-2009 |
20090002356 | DISPLAY APPARATUS AND DRIVING METHOD OF DISPLAY APPARATUS - A display apparatus including a pixel circuit including a light emitting element arranged in a site where a scanning line crosses a signal line; a holding capacitor; a first switch which opens and closes connection between one terminal of the light emitting element and the signal line in accordance with a signal applied to the scanning line; a second switch which opens and closes connection between one terminal of the holding capacitor and the signal line in accordance with a signal applied to the scanning line to control current to be supplied to the light emitting element, wherein in the pixel circuit selected by a signal of the scanning line, the first switch is closed to apply a voltage to one terminal of the light emitting element from a first voltage supply connected to the signal line and the second switch is closed to apply a voltage to one terminal of the holding capacitor from a second voltage supply connected to the signal line. | 01-01-2009 |
20100007656 | DISPLAY APPARATUS AND DRIVING METHOD THEREOF - Display image quality degradation caused by a burn-in phenomenon is prevented in a self-emission type display apparatus. A degradation characteristic acquisition circuit acquires degradation characteristics of a pixel region, and a boundary portion detection circuit detects a boundary of the degradation characteristics. A correction amount operation circuit arithmetically operates a correction amount based on the boundary, and a video signal correction circuit corrects a video signal. The correction amount is determined based on the boundary of the degradation characteristics such that emission luminance is gently varies in a periphery of a boundary of a pixel due to the burn-in phenomenon, and whereby the burn-in phenomenon becomes inconspicuous. | 01-14-2010 |
20100073265 | ACTIVE-MATRIX DISPLAY AND DRIVE METHOD THEREOF - An active-matrix display includes a data line, at least one select line, a control unit supplying a voltage signal and a current signal to the data line, and a pixel circuit receiving the voltage signal and the current signal from the data line to drive a light emitting element, the control unit including a voltage or first current source supplying a voltage or current pulse to the data line in order to make the voltage holding unit hold the voltage signal for making the light emitting element emit light having predetermined brightness in a first selection period in which the first switch is closed, a second current source supplying the current signal for making the light emitting element emit light having the predetermined brightness to the data line in a second selection period in which the first switch and the second switch are closed, a detection circuit detecting potential held in the voltage holding unit in the second selection period, and a correction unit correcting the voltage signal based on a relationship between the current signal and the detected potential. | 03-25-2010 |
20110121686 | DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR - A driving circuit is configured to drive a vibration-type actuator including a vibration member and a moving member. The vibration member includes an electro-mechanical energy conversion element and may generate a vibration wave in response to an alternating voltage applied to the electro-mechanical energy conversion element. The moving member is in contact with the vibration member and may move in response to the vibration wave relative to the vibration member. The driving circuit includes a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element. Parameters of the driving circuit may be set such that when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·fm05-26-2011 | |
20110227511 | DRIVING UNIT OF VIBRATION-TYPE ACTUATOR - A driving unit of a vibration-type actuator includes a command unit, a change making unit, an AC signal generating unit, and a filter unit. The command unit outputs a command signal that directs at least one of a frequency, an amplitude, and a phase difference of an AC signal. The change making unit makes a change to the command signal and outputs the command signal. The AC signal generating unit generates a generated AC signal in which at least one of a frequency, an amplitude, and a phase difference of the generated AC signal is modulated in accordance with the output of the change making unit. The filter unit selectively dampens a frequency component, of at least one of the output signal of the change making unit and an output signal of the AC signal generating unit, that excites vibration other than vibration in a predetermined vibration mode. | 09-22-2011 |
20110248652 | CONTROL CIRCUIT FOR VIBRATION-TYPE ACTUATOR - A control circuit is provided for a vibration-type actuator that generates a vibration wave in a vibrating member by applying an alternating voltage, and relatively rotates a moving member contacting protrusions of the vibrating member. The control circuit includes a feedback control circuit and a repetitive compensator. The feedback control circuit subjects the vibration-type actuator to feedback control based on a deviation between a relative speed between the moving member and the vibrating member and a command speed or a deviation between a relative position between the moving member and the vibrating member and a command position. The repetitive compensator provides a repetitive period that is set to T/(an integral multiple of fs), where T is a period of rotation of the moving member, and fs is a spatial frequency of a speed deviation based on a contact area distribution between the protrusions and the moving member. | 10-13-2011 |
20120194910 | VIBRATION MEMBER DRIVING CIRCUIT - A vibration member driving circuit causes vibrations in a vibration member at least including an electro-mechanical energy conversion element and an elastic body by applying alternating voltage to the electro-mechanical energy conversion element fixed to the elastic body. The vibration member driving circuit includes an inductor and capacitor serially connected to the electro-mechanical energy conversion element. 0.73*fm08-02-2012 | |
20120274243 | DRIVING CIRCUIT FOR VIBRATION APPARATUS - The present invention provides a driving circuit for a vibration apparatus which drives an object using a vibration wave generated by an electro-mechanical energy conversion element is equipped with an electrical resonance circuit, and which is capable of reducing harmonic components of an alternating voltage applied to an electro-mechanical energy conversion element. The electrical resonance circuit includes an electrostatic capacity of the conversion element, plural inductors connected in series with the conversion element, and a capacitor connected at one end between the plural inductors and connected in parallel with the conversion element. The electrical resonance circuit has at least two resonance frequencies including a first frequency and a second frequency and satisfies the relation: | 11-01-2012 |
20130249445 | CONTROL APPARATUS OF VIBRATION-TYPE ACTUATOR - Information regarding a rotational speed is detected by utilizing a variation in the amplitude at a frequency corresponding to the number of a plurality of protrusions of a vibrating member generated in an S-phase signal detected from a vibration detection electrode of a vibration-type actuator. | 09-26-2013 |
20140009088 | DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR - An apparatus includes a vibration-type actuator and a driving circuit. The vibration-type actuator includes a vibration member and a moving member, wherein the vibration member includes an electro-mechanical energy conversion element and the moving member is configured to move relative to the vibration member. The driving circuit includes a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element. In an example, parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·fm01-09-2014 | |
20140071545 | CONTROL DEVICE, ACTUATOR INCLUDING CONTROL DEVICE, IMAGE BLUR CORRECTION DEVICE, INTERCHANGEABLE LENS, IMAGE PICKUP APPARATUS, AND AUTOMATIC STAGE - A control device includes: a controller that outputs control, signals pertaining to at least two directions, respectively, based on predetermined gains in a normal operation mode, and outputs control signals based on gains set with respect to the two directions, respectively, in a learning operation mode; a controlled amount calculating unit that receives the control signals and outputs signals pertaining to drive parameters with respect to at least two motors, respectively, wherein the controlled amount calculating unit includes: a characteristic difference calculating unit that calculates characteristic differences between at least the two motors based on the control signals; and a gain compensator that corrects controlled amount pertaining to drive parameters of at least the two motors according to the calculated characteristic differences of at least the two motors, and outputs the signals. | 03-13-2014 |
20140074297 | CONTROL DEVICE, ACTUATOR INCLUDING CONTROL DEVICE, IMAGE BLUR CORRECTION DEVICE, REPLACEMENT LENS, IMAGING DEVICE AND AUTOMATIC STAGE - Provided is a vibration type driving device enabling multidirectional driving of a moving body while considering a difference in transfer characteristics of the synthesized driving force of a plurality of motors between at least two mutually crossing directions. | 03-13-2014 |
20140232300 | VIBRATION MEMBER DRIVING CIRCUIT - A vibration member driving circuit causes vibrations in a vibration member at least including an electro-mechanical energy conversion element and an elastic body by applying alternating voltage to the electro-mechanical energy conversion element fixed to the elastic body. The vibration member driving circuit includes an inductor and capacitor serially connected to the electro-mechanical energy conversion element. 0.73*fm08-21-2014 | |
20140292233 | DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR - A driving circuit to drive a vibration member comprising an electro-mechanical energy conversion element includes a transformer connected in parallel to the electro-mechanical energy conversion element. The transformer includes a primary coil configured such that an alternating voltage is applied to the primary coil, and a secondary coil connected to the electro-mechanical energy conversion element in parallel, and an inductor connected to the primary coil in series, Parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<1.5·fd is satisfied. | 10-02-2014 |