Electric Switch In The Condenser Circuit Patents (Class 315/240)
  • Patent number: 10999912
    Abstract: A lighting driver for driving a light-emitting component at a high speed is provided. A control terminal of a second transistor is connected to a control terminal and a first terminal of a first transistor. Input terminals of an operational amplifier are connected to the first terminal of the first transistor and first terminals of first and second switches. Control terminals of third and fourth transistors are connected to an output terminal of the operational amplifier. Second terminals of the first switch and the fourth transistor are connected to a first terminal of the second transistor. A second terminal of the second switch and a current source are connected to a second terminal of the third transistor. A first terminal of the fourth transistor is connected to the light-emitting component. A control circuit is connected to the current source, and control terminals of the first and second switches.
    Type: Grant
    Filed: July 10, 2020
    Date of Patent: May 4, 2021
    Assignee: ANPEC ELECTRONICS CORPORATION
    Inventors: Wen-Yen Chen, Ming-Hung Chang
  • Patent number: 10950176
    Abstract: The present disclosure discloses a pixel compensation circuit, a driving method, an electroluminescent display panel and a display device. Due to the interaction of a data writing circuit, a voltage input circuit, a discharge control circuit, a storage circuit, a conduction control circuit and a driving circuit, the compensation for a threshold voltage of the driving circuit and IR Drop of a first power signal may be realized by a simple structure and a simple time sequence.
    Type: Grant
    Filed: January 2, 2019
    Date of Patent: March 16, 2021
    Assignees: Chengdu BOE Optoelectronics Technology Co., Ltd., BOE Technology Group Co., Ltd.
    Inventors: Taoran Zhang, Zailong Mo, Da Zhou, Ke Dai, Yiyang Zhang
  • Patent number: 10904448
    Abstract: A method, system, and computer program product controlling flash behavior of a camera during capture of image data. The method includes identifying a target object from among a plurality of objects in a current scene. The method further includes determining whether a distance to the target object is within an effective flash range associated with at least one flash module of an image capturing device. The method further includes measuring, via at least one camera, an ambient light level within the current scene and comparing the measured ambient light level to a predetermined flash light threshold. The method further includes, in response to determining the target object is within the effective flash range and the measured ambient level is less than the predetermined flash light threshold, triggering at least one flash module of the image capturing device to illuminate the current scene during capture of image data by the at least one camera.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: January 26, 2021
    Assignee: Motorola Mobility LLC
    Inventors: Yin Hu Chen, Valeriy Marchevsky, Susan Yanqing Xu
  • Patent number: 10708994
    Abstract: A circuit for controlling a lighting system includes a phase angle detector detecting a phase angle of a rectified input signal and generating a phase angle signal indicative of the phase angle, and a current shape controller determining a current shaping signal using the detected phase angle and adjusting the rectified input signal in response to the current shaping signal. The current shape controller varies a limiting value of the rectified input signal with the phase angle.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: July 7, 2020
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Hyunchul Eum
  • Patent number: 10607546
    Abstract: A pixel circuit includes a light emitting component, a storage capacitor, a driving transistor, a first switch, a second switch, a third switch, and a fourth switch. A first end of the driving transistor is configured to receive a supply voltage, and a second end of the driving transistor is electrically connected to an anode end of the light emitting component. The first switch is configured to provide a first reference voltage to a second end of the storage capacitor. The second switch is configured to provide the supply voltage to the first end of the storage capacitor. The third switch and the fourth switch are configured to provide an operating voltage corresponding to a data voltage and a threshold voltage of the third switch to the second end of the storage capacitor.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: March 31, 2020
    Assignee: AU OPTRONICS CORPORATION
    Inventor: Mao-Hsun Cheng
  • Patent number: 10515591
    Abstract: In the pixel driving circuit of the disclosure, the control terminal of the driving unit is connected with a first terminal of the storage capacitor, the first signal terminal of the first switching unit, the first signal terminal of the second switching unit and the control terminal of the third switching unit. The control terminal of the first switching unit is operable to input a reset signal. The second signal terminal of the first switching unit is connected with an initialization voltage. The control terminal of the second switching unit is operable to input a scan signal. The second signal terminal of the second switching unit is connected with the first signal terminal of the third switching unit. The second signal terminal of the third switching unit is operable to input a data signal. The control terminal of the fourth switching unit is operable to input a light emitting signal.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: December 24, 2019
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventor: Yuhsiung Feng
  • Patent number: 10321532
    Abstract: An intelligent mains power supply dimmer unit and LED lamp combination with improved power factor. The dimmer applies phase-cutting at a first angle for a first period to a mains voltage supplied to the lamp, whereafter the dimmer removes the phase-cutting. The lamp interprets the first angle as a first power level, which is then stored. The lamp retrieves the level after the first period and regulates its consumption accordingly.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: June 11, 2019
    Assignee: AZOTEQ (PTY) LTD
    Inventor: Frederick Johannes Bruwer
  • Patent number: 10319302
    Abstract: The present invention provides a pixel circuit, a driving method thereof and a display device which are related to the field of display technology. The pixel circuit comprises a reset module, a compensation module, an energy storage module, a drive module, a drive control module, a power supply module and a light emitting module, the input voltage of the third power supply signal terminal is larger than the difference between the input voltage of the data signal terminal and the threshold voltage of the drive module, and is less than the input voltage of the second power supply signal terminal. The present invention is capable of discharging the driving transistor to a potential Vth within a short period, ensuring the driving transistor to be discharged completely in a short time.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: June 11, 2019
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Zhanjie Ma, Liang Sun
  • Patent number: 10304381
    Abstract: The present disclosure relates to a pixel compensation circuit and a driving method thereof, and a display device. The pixel compensation circuit includes a light emitting component, a driving transistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a storage capacitor. One end of the light emitting component connects to the common voltage (VSS). One end of the driving transistor connects to the power voltage (VDD). A control end of the first transistor (T1) connects to first scanning signals (Scan). A control end of the second transistor (T2) connects to the first scanning signals (Scan). A control end of the third transistor (T3) connects to the first scanning signals (Scan). A control end of the fourth transistor (T4) connects to second scanning signals (Scan2). A control end of the fifth transistor (T5) connects to the first scanning signals (Scan).
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: May 28, 2019
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventor: Baixiang Han
  • Patent number: 10178717
    Abstract: An apparatus includes a lamp-control circuit. The lamp-control circuit is configured to be electrically connectable to an electrical source having an output voltage that forms a periodic wave formation. The lamp-control circuit is also configured to be electrically connectable to a lamp array. This is done in such a way that electrical current, in use, flows from the electrical source to, and through, the lamp array. The lamp array includes lamp segments. The lamp-control circuit is also configured to urge each lamp segment of the lamp array to consume relatively constant power for a portion of a cycle of the output voltage of the electrical source in such a way that said each lamp segment of the lamp array, in use, emits a relatively constant light output for the portion the cycle of the output voltage of the electrical source.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: January 8, 2019
    Inventors: Sean Paul Seyler, Dongming Li, Wen Wen Li
  • Patent number: 9891503
    Abstract: A light emitting device including first and second power sources, which is capable of emitting light without being affected by a charging recycle period. The light emitting device includes an LED as a light emitting section for emitting light, and illuminates an object by light emission from the LED. The light emitting device further includes a first power source and a second power source that is charged by the first power source. Light emission from the LED is controlled using one of the first power source and the second power source as an input power supply according to light emitting current for causing the LED to emit light.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: February 13, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Genta Otsuka
  • Patent number: 9693406
    Abstract: Disclosed is a circuit for driving an AC direct lighting apparatus, including a triac dimmer configured to control a brightness of an LED module, a charger configured to be charged during a turn-off period of the triac dimmer, a reference voltage generator configured to generate a reference voltage based on a voltage charged in the charger during a first turn-off period of the triac dimmer and a voltage charged in the charger during a second turn-off period, and a driving signal output unit configured to output a driving signal of the LED module in response to a voltage charged in a third turn-off period of the triac dimmer reaching the generated reference voltage. Accordingly, the driving circuit manages a driving time deviation of the LED module, removing a flicker phenomenon from the light produced by the module.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: June 27, 2017
    Assignee: Magnachip Semiconductor, Ltd.
    Inventors: Hyun Jung Kim, Seung Hwan Lee
  • Patent number: 9545592
    Abstract: The present invention provides a protection device for air filter, which includes a dust sensor and an air filter protector, wherein, the air filter protector includes: a dust concentration comparator adapted for comparing a level signal transmitted by the dust sensor to represent a particle concentration of dust or smoke with a reference level, so as to output a positive or negative pulse signal according to a result of the comparison; a first inverter; a pulse generator and adapted for inverting a pulse signal outputted by the first inverter; a filtering comparator adapted for converting an output of the pulse generator into a high or low level signal; a relay switch adapted for performing on or off action according to the output of the filtering comparator, so as to control opening and closing of an air valve of the air filter.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: January 17, 2017
    Assignee: AIR-SYS REFRIGERATION ENGINEERING TECHNOLOGY (BEIJING) CO., LTD
    Inventors: Yunshui Chen, Xiaolong Yang, Bo Wu
  • Patent number: 9225254
    Abstract: A supply circuit includes: a bridge circuit, one or more resonant circuits coupled to the bridge circuit, each of the one or more resonant circuits being coupleable to a corresponding load circuit among one or more load circuits each of which includes one or more loads; one or more supply switching units, each of the one or more supply switching units being associated with a corresponding one of the one or more resonant circuits and being coupled between the bridge circuit and an associated one of the one or more load circuits for connecting and disconnecting the associated load circuit from the bridge circuit; and a control unit for controlling each of the one or more supply switching units in synchronization with a resonant current of the resonant circuit associated with the supply switching unit.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: December 29, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Martin Paul Christoph, Joseph Hendrik Anna Maria Jacobs, Dirk Hente
  • Patent number: 9041313
    Abstract: A ballast circuit for a Light Emitting Diode (LED) has a regulator element coupled to the LED and to an input voltage source. A control circuit is coupled to the LED and to an input voltage source. A first switching device is coupled in series with the regulator element. A second switching device is coupled to the input voltage and the control circuit.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: May 26, 2015
    Assignee: Microchip Technology Inc.
    Inventor: Alexander Mednik
  • Publication number: 20150123558
    Abstract: A display unit provided with a display panel including a light emitting element and a pixel circuit for each pixel, and a drive circuit configured to drive each of the pixels. The pixel circuit includes: a first transistor configured to sample a voltage corresponding to a picture signal, the first transistor having characteristics that a parasitic capacitance at a time when the first transistor is turned off is decreased as magnitude of negative bias applied to a gate voltage is increased; a second transistor configured to control a current flowing through the light emitting element based on magnitude of the voltage sampled by the first transistor; and a retention capacitance configured to retain the voltage sampled by the first transistor.
    Type: Application
    Filed: October 7, 2014
    Publication date: May 7, 2015
    Inventor: Naobumi Toyomura
  • Patent number: 9018848
    Abstract: A method for powering two circuits in a portable light that are connected by a single conductive chassis so that each of the two circuits is able to have time shared access to a power source.
    Type: Grant
    Filed: September 29, 2012
    Date of Patent: April 28, 2015
    Assignee: Jonlincia LLC
    Inventor: Richard Jeff Garcia
  • Patent number: 9000678
    Abstract: An LED lamp with an integrated circuit, a rectifier, and a string of series-connected LEDs rectifies an incoming AC signal. The integrated circuit includes power switches that can separately and selectably short out a corresponding one of several groups of LEDs in an LED string across which the rectified AC signal is present. As the voltage across the string increases, the integrated circuit controls the power switches to increase the number of LEDs through which current flows, whereas as the voltage across the string decreases the integrated circuit controls the power switches to decrease the number of LEDs through which current flows. The flow of LED string current is broken to reduce flicker. Alternatively, a valley fill capacitor peaks LED current during the valleys of the incoming AC signal to reduce flicker. LED current is regulated to provide superior efficiency, reliability, power-factor correction, and lamp over-voltage, -current, and -temperature protection.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: April 7, 2015
    Assignee: Active-Semi, Inc.
    Inventor: Steven Huynh
  • Publication number: 20150084536
    Abstract: In an electronic flash device using a discharge flash tube (10) including a pair of discharge electrodes (14, 16) and a trigger electrode (18), an improvement is made to eliminate failures to emit flash light following a consecutive emitting of weak flash lights which is known to occur particularly when barium is used as the material for electron emission in the cathode (16) of the flash tube. A timing of applying the trigger voltage to the trigger electrode is delayed in relation to a timing of applying the discharge voltage to the discharge electrodes.
    Type: Application
    Filed: September 25, 2013
    Publication date: March 26, 2015
    Inventor: Tak Wah SHUM
  • Publication number: 20150077010
    Abstract: Provided is the pixel circuit for active matrix display apparatus and the driving method thereof, which is controlled by digital signal. The pre-charge pixel voltage is controlled and discharged by controlling the resistor and transistors, so that the desired grey scale is generated. The pixel circuit includes: a first switch, a second switch, a third switch, an energy storage device and resistor. By controlling the third switch, the first end of the energy storage device is charged to the voltage of the second source. The first switch and the second switch are controlled to switch on, so that the first end of the energy storage device discharging to the first source. The second switch switches off when the first end of the energy storage device reaches the desired pixel voltage.
    Type: Application
    Filed: April 30, 2014
    Publication date: March 19, 2015
    Applicant: National Chiao Tung University
    Inventors: Ya-Hsiang TAI, Lu-Sheng CHOU, Chun-Yu LIN, Chia-Hung CHANG
  • Publication number: 20150035448
    Abstract: A pixel circuit, a driving method, and a display apparatus, wherein the pixel circuit includes: a first switch transistor having a source connected to a data signal terminal, and a gate connected to a first control signal terminal; a first capacitor having a first terminal connected to a drain of the first switch transistor; a second capacitor having a first terminal connected to a second voltage signal terminal, and a second terminal connected to a second terminal of the first capacitor; a third capacitor having a first terminal connected to the first control signal terminal, and a second terminal connected to a gate of a driving transistor; a second switch transistor having a source connected to the gate of the driving transistor, a drain connected to a drain of the driving transistor, and a gate connected to the first control signal terminal; and a third, fourth, fifth and sixth switch transistors.
    Type: Application
    Filed: July 31, 2013
    Publication date: February 5, 2015
    Inventor: Ying Wang
  • Patent number: 8947008
    Abstract: A low output voltage driver circuit for a light-emitting device is provided according to exemplary embodiments of the present invention. Also, an offset voltage cancellation and/or level shifter is incorporated into the driver circuit to increase the accuracy of the driving current. In addition, an error detection circuit and method are employed in order to adaptively detect the minimum output voltage of the inventive driver circuit.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: February 3, 2015
    Assignee: Silicon Touch Technology Inc.
    Inventors: Yu-Chun Chuang, Ruei-Iun Pu
  • Publication number: 20150028766
    Abstract: The present disclosure relates to a field of display technology, and particularly to a pixel circuit and a method for driving the same. The pixel circuit includes a driving sub-circuit, a resetting sub-circuit, and a charging sub-circuit, wherein the driving sub-circuit includes a driving transistor, a first transistor, a third transistor, a first storage capacitor and a second storage capacitor; the resetting sub-circuit discharges the first storage capacitor and the second storage capacitor under the control of a first scan signal outputted from the first scan signal line; and the charging sub-circuit includes a fifth transistor and a sixth transistor.
    Type: Application
    Filed: July 26, 2013
    Publication date: January 29, 2015
    Applicant: BOE Technology Group Co., LTD
    Inventor: Fei Yang
  • Patent number: 8922133
    Abstract: A two-wire smart load control device, such as an electronic switch, for controlling the power delivered from a power source to an electrical load comprises a relay for conducting a load current through the load, a controller for rendering the relay conductive and non-conductive, and an in-line power supply coupled in series with the relay for generating a supply voltage across a capacitor when the relay is conductive. The power supply controls when the capacitor charges asynchronously with respect to the frequency of the source. The capacitor conducts the load current for at least a portion of a line cycle of the source when the relay is conductive. The controller is operable to determine when the magnitude of the supply voltage reaches a maximum supply voltage threshold, and render the relay non-conductive immediately after the supply voltage reaches the maximum supply voltage threshold.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: December 30, 2014
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Donald F. Hausman, Jr., Miguel Aguado Pelaez, Christopher James Salvestrini, Bingrui Yang
  • Publication number: 20140354622
    Abstract: A pixel driving circuit includes a light-emitting working unit, a driving unit, a data signal input, a initial voltage input, a driving power input and a plurality of control level inputs. The driving unit includes a voltage storage element and a driving element. The driving element includes a first electrode, a second electrode and a control terminal. One end of the voltage storage element is connected to the control terminal of the driving element. The first electrode of the driving element forms a first input port of the input port of the driving unit. The pixel circuit is capable of improving the display effect and improving the display life of AM-OLED.
    Type: Application
    Filed: May 27, 2014
    Publication date: December 4, 2014
    Applicant: EverDisplay Optronics (Shanghai) Limited
    Inventors: YongLiang Qin, Jr Hong Chen, Chu Wan Huang
  • Publication number: 20140346968
    Abstract: There are provided a pixel unit driving circuit and driving method, pixel unit and display apparatus. The pixel unit driving circuit is used for driving a light-emitting device to emit light, and comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3) and a storage capacitor (Cs). A gate of the first thin film transistor (T1) is connected with a control line (Gate), a first electrode thereof is connected with a data line (Data), and a second electrode thereof is connected with a first node (A). One gate of the second thin film transistor (T2) is connected with the control line (Gate) and the other gate is connected with a second scan line (Scan2), a first electrode thereof is connected with the storage capacitor (Cs), and a second electrode thereof is connected with a second node (B).
    Type: Application
    Filed: March 29, 2013
    Publication date: November 27, 2014
    Inventors: Qingchao Meng, Xiaoyan Liu, Wenjie Wang, Xiaojun Su
  • Patent number: 8896219
    Abstract: A Light Emitting Diode (LED) driver circuit for driving an LED string has a switch-mode power supply coupled to the LED string. A control circuit is provided and has a first terminal coupled to a pulse width modulated input and a second terminal coupled to the switch mode power supply. A disconnect switch is coupled to a third terminal of the control circuit and the LED string.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: November 25, 2014
    Assignee: Supertex, Inc.
    Inventor: Alexander Mednik
  • Publication number: 20140333221
    Abstract: An LED light unit, in particular for a passenger transport vehicle, such as an aircraft, a road vehicle, a ship or a rail car, is disclosed that has at least one LED and is configured to be used with a high intensity discharge lamp power supply that is adapted to monitor its output behavior. The LED light unit comprises a power input coupleable to the high intensity discharge lamp power supply, a capacitor switchably coupled to the power input for absorbing electrical energy from the high intensity discharge lamp power supply, and a power dissipating element switchably coupled to the power input for dissipating electrical energy from the high intensity discharge lamp power supply.
    Type: Application
    Filed: April 25, 2014
    Publication date: November 13, 2014
    Applicant: Goodrich Lighting Systems GmbH
    Inventors: Robert Trinschek, Andre Hessling von Heimendahl, Steffen Roebke
  • Publication number: 20140320037
    Abstract: A ballast circuit for a Light Emitting Diode (LED) has a regulator element coupled to the LED and to an input voltage source. A control circuit is coupled to the LED and to an input voltage source. A first switching device is coupled in series with the regulator element. A second switching device is coupled to the input voltage and the control circuit.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Inventor: Alexander Mednik
  • Publication number: 20140312799
    Abstract: A display device includes a voltage supply unit to output a first voltage, a switch unit to selectively output the first voltage or a second voltage, a coupling member to transfer a third voltage to a display panel, and a feedback unit to selectively feed back the first voltage or the third voltage. The voltage supply unit receives a voltage based on the first voltage or the third voltage selected by the feedback unit, and the third voltage is based on the first voltage output from the switch unit. The voltage supply unit may compensate for drops in a control voltage of the display panel based on the fed back voltage.
    Type: Application
    Filed: March 27, 2014
    Publication date: October 23, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventor: Jin-Woo KIM
  • Publication number: 20140246989
    Abstract: A charge recycling device for a panel display apparatus is disclosed. The charge recycling device includes one or more storage capacitors, and one or more switch modules coupled to the one or more storage capacitors and coupled to a plurality of load capacitors via a plurality of source driving nodes, for controlling currents between the plurality of load capacitors and the one or more storage capacitors. During a charge recycling period, the one or more switch modules are arranged to recycle charges stored in the plurality of load capacitors to the one or more storage capacitors. During a charge reutilization period, the one or more switch modules are arranged to redistribute the recycled charges to the plurality of load capacitors.
    Type: Application
    Filed: May 20, 2014
    Publication date: September 4, 2014
    Applicant: NOVATEK Microelectronics Corp.
    Inventor: Tse-Hung Wu
  • Patent number: 8786205
    Abstract: Aspects of the disclosure provide a circuit. The circuit includes a first switch, a second switch and a controller. The first switch is switched on and off to allow a boost circuit to transfer electric energy from an input power supply to a capacitor to generate an intermediate power supply having a higher voltage than the input power supply. The second switch is switched on and off to allow a buck circuit to provide a driving voltage based on the intermediate power supply to drive a load device, and to regulate a current to the load device. The controller is configured to provide a first signal to the first switch and a second signal to the second switch to switch on and off the first switch and the second switch.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: July 22, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Wanfeng Zhang, InHwan Oh
  • Patent number: 8779677
    Abstract: A circuit arrangement for driving a light source, in particular, a light-emitting diode, comprises a first adjustable current path (1), that connects a terminal (BAT_IN) for a battery to a terminal (CAP_IN) for a capacitor, a second current path (2) that connects the terminal (CAP_IN) for a capacitor to a terminal (LED_OUT) for a light source, and a third adjustable current path (3) that connects the terminal (BAT_IN) for a battery to the terminal (LED_OUT) for a light source. A control unit (CTRL) is provided that has a control input (IN) and is set up to adjust current intensities (I_CHRG, I_CAP, I_DIRECT) on the first, second and third control paths (1, 2, 3), respectively, as a function of control signals (I_in) that can be applied to the control input (IN). A method for operating a light source, in particular, a light-emitting diode, is also proposed.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: July 15, 2014
    Assignee: AMS AG
    Inventor: Peter Trattler
  • Publication number: 20140167640
    Abstract: This invention relates to driver circuits used within high voltage power supplies, e.g. for light bulb assemblies. A driver circuit providing electrical energy at an output derived from electrical energy at an input is described. The driver circuit comprises a power converter, a controller, a supply voltage capacitor, and is configured to provide a supply voltage to the controller. A start-up resistor is coupled to the input of the driver circuit, charges the supply voltage capacitor, and is coupled to the supply voltage capacitor during start-up of the driver circuit. A back-up capacitor is coupled to the output of the driver circuit and with the supply voltage capacitor if a voltage at the back-up capacitor exceeds the supply voltage by a forward voltage threshold, and is decoupled from the supply voltage capacitor if the supply voltage exceeds the voltage at the back-up capacitor by a reverse voltage threshold.
    Type: Application
    Filed: December 17, 2013
    Publication date: June 19, 2014
    Applicant: Dialog Semiconductor GmbH
    Inventor: Horst Knoedgen
  • Publication number: 20140152191
    Abstract: The embodiments of the present disclosure provide a pixel driving circuit and a driving method thereof, an array substrate and a display apparatus, which is able to avoid an influence on a driving current of an active light emitting device caused by a drift in a threshold voltage of a driving transistor. The pixel driving circuit comprises a data line, a first scan line, a second scan line, a signal controlling line, a light emitting device, a storage capacitor, a driving transistor, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor and a fifth switch transistor. The embodiments of the present disclosure may be applied to a display manufacture.
    Type: Application
    Filed: November 29, 2013
    Publication date: June 5, 2014
    Applicant: BEIJING BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Shengji YANG, Junwei WU, Yingming LIU
  • Publication number: 20140152190
    Abstract: A pixel unit driving circuit, a pixel unit and a display device, wherein said pixel unit driving circuit of the pixel unit comprises a switching unit (201) having a first terminal connected to a high-voltage signal terminal (Vdd), a second terminal connected to a light-emitting device (OLED), a third terminal connected to a first control line (CN1), and a fourth terminal connected to a second control line (CN2); a driving transistor (T1) having a drain connected to the switching unit (201), and a source connected to a low-voltage signal terminal (Vss); and a capacitance storage unit (202) having a first terminal connected to the gate of the driving transistor (T1), a second terminal connected to the source of the driving transistor (T1), and a third terminal connected to the second control line (CN2).
    Type: Application
    Filed: December 27, 2012
    Publication date: June 5, 2014
    Applicant: BOE TECHNOLOGY GROUP CO., LTD
    Inventors: Wen Tan, Xiaojing Qi
  • Patent number: 8742675
    Abstract: Disclosed herein is a light-emitting panel including: an organic electroluminescence element adapted to emit electroluminescence light toward a transparent substrate; a pixel circuit formed on the transparent substrate and adapted to drive the organic electroluminescence element; a color filter formed not only between the transparent substrate and organic electroluminescence element but also immediately on or above the pixel circuit; and a conductive layer formed between the pixel circuit and color filter, the conductive layer being more conductive than the color filter.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: June 3, 2014
    Assignee: Sony Corporation
    Inventors: Keisuke Omoto, Shinichi Teraguchi
  • Publication number: 20140132175
    Abstract: A light-emitting element includes a light-emitting section and a driving circuit that drives the light-emitting section. The driving circuit includes at least (A) a drive transistor that is a p-channel field effect transistor, (B) an image-signal writing transistor that is a p-channel field effect transistor, (C) a light-emission control transistor that is a p-channel field effect transistor, and (D) a capacitor. Each of the drive transistor, image-signal writing transistor, and light-emission control transistor is provided in an n-type well formed in a p-type silicon semiconductor substrate. A first source/drain region of the drive transistor is electrically connected to the n-type well in which the drive transistor is formed.
    Type: Application
    Filed: November 7, 2013
    Publication date: May 15, 2014
    Applicant: Sony Corporation
    Inventors: Nobuaki Hokazono, Junichi Yamashita, Yusuke Onoyama
  • Publication number: 20140132176
    Abstract: In one embodiment, a light-emitting diode (LED) driver can include: (i) a reference voltage control circuit configured to provide a reference voltage signal in response to an enable signal; (ii) a current control circuit configured to control an output current of the LED driver in response to the reference voltage signal; and (iii) the LED driver being configured to drive an LED load when the enable signal is active.
    Type: Application
    Filed: September 26, 2013
    Publication date: May 15, 2014
    Applicant: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Xiaoru Xu, Lu Zhang
  • Publication number: 20140084805
    Abstract: Disclosed is a pixel circuit which facilitates to compensate a threshold voltage of a driving transistor for controlling an operation state of a light emitting device, and a method for driving thereof and an organic light emitting display device using the same, wherein the pixel circuit includes a light emitting device including an organic light emitting cell; a driving transistor which controls an operation of the light emitting device according to a voltage applied between gate and source terminals; a capacitor including first and second terminals; a switching unit which initializes the capacitor during a current horizontal period, stores a sampling voltage in the capacitor, and makes the light emitting device emit light on the basis of the sampling voltage stored in the capacitor whenever the data voltage and reference voltage are supplied to the data line after the current horizontal period.
    Type: Application
    Filed: December 10, 2012
    Publication date: March 27, 2014
    Applicant: LG Display Co., Ltd.
    Inventors: Hyoung-Su Kim, Bu Yeol Lee, Jin-Hyun Jung
  • Publication number: 20140084806
    Abstract: The present disclosure discloses a pixel unit driving circuit, a driving method, and a display apparatus, wherein the pixel unit driving circuit includes a light-emitting device, a driving transistor, a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a first capacitor, and a second capacitor. The pixel unit driving circuit is driven in a stepwise manner by the turn-on/off of the switching transistors in cooperation with the charging of the capacitors, so that a driving current of the driving transistor has no relation to the turn-on voltage Vth of the driving transistor, and in turn the evenness of a current flowing through the light-emitting device is guaranteed so as to achieve the evenness of the luminance of the light-emitting device.
    Type: Application
    Filed: October 24, 2012
    Publication date: March 27, 2014
    Applicants: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Xiaojing Qi, Bo Wu
  • Patent number: 8674624
    Abstract: A direct current to direct current converter includes: an input terminal; an output terminal having voltage higher than the input terminal; a coupled inductor boost cell including a coupled inductor connected to the input terminal, a switch connected to the coupled inductor, and an output diode connected to the output terminal; and a clamp and energy transfer cell including a clamp diode connected to the coupled inductor, a clamp capacitor connected to the clamp diode, and an energy transfer diode connected to the output diode.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: March 18, 2014
    Assignees: Samsung Display Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Won Sik Oh, Gun Woo Moon, Shin Young Cho, Dae Youn Cho
  • Publication number: 20140002436
    Abstract: A pixel circuit including a first through fifth PMOS transistors, a storage capacitor and an organic light emitting diode is disclosed. The first and second PMOS transistors are connected in serial between a first voltage and a first node. The third and fourth PMOS transistors are connected in serial between a second voltage and the first node. Gate electrodes of the first and third PMOS transistors are connected to a scan line. A gate electrode of the second PMOS transistor is connected to a first data line. A gate electrode of the fourth PMOS transistor is connected to a second data line. The fifth PMOS transistor is connected between a first power supply voltage and the organic light emitting diode and has a gate electrode connected to the first node. The storage capacitor is connected between the first node and a first electrode of the fifth PMOS transistor.
    Type: Application
    Filed: December 7, 2012
    Publication date: January 2, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventor: Hyung-Soo Kim
  • Publication number: 20130342129
    Abstract: This relates to an apparatus and method for selectively adding a capacitance to an input of a power converter of a power conversion system. A power conversion system may selectively introduce additional input capacitance in response to an input voltage. In one example, a power conversion system operates in a first mode (dimming mode) and engages a selective capacitor circuit to introduce additional capacitance to an input of a power converter. In a second mode (non-dimming mode), the power conversion system disengages the selective capacitor circuit from the input of the power converter.
    Type: Application
    Filed: June 20, 2012
    Publication date: December 26, 2013
    Applicant: Power Integrations, Inc.
    Inventor: Peter VAUGHAN
  • Publication number: 20130334979
    Abstract: A pixel circuit for use in a display comprising a plurality of pixels is provided. The load-balanced current mirror pixel circuit can compensate for device degradation and/or mismatch, and changing environmental factors like temperature and mechanical strain. The pixel circuit comprises a pixel drive circuit comprising, switching circuitry, a current mirror having a reference transistor and a drive transistor, the reference transistor and the drive transistor each having a first and second node and a gate, the gate of the reference transistor being connected to the gate of the drive transistor; and a capacitor connected between the gate of the reference transistor and a ground potential, and a load connected between the current mirror and a ground potential, the load having a first load element and a second load element, the first load element being connected to the first node of the reference transistor and the second load element being connected to the first node of the drive transistor.
    Type: Application
    Filed: July 2, 2013
    Publication date: December 19, 2013
    Inventors: Arokia Nathan, Kapil V. Sakariya, Peyman Servati, Shahin Jafarabadiashtiani
  • Publication number: 20130313993
    Abstract: A drive circuit includes a first transistor coupled in series with a second transistor at a first intermediate node coupled to a load. An amplifier has an output driving a control terminal of the second transistor. The amplifier includes a first input coupled to a second intermediate node and a second input coupled to a reference voltage. A feedback circuit is coupled between the first intermediate node and the second intermediate node. A slope control circuit is coupled the second intermediate node. The slope control circuit injects a selected value of current into the second intermediate node, that current operating to control the output of the amplifier in setting a slope for change in voltage at the first intermediate node.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 28, 2013
    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
    Inventors: Meng Wang, Tao Tao Huang
  • Publication number: 20130278159
    Abstract: A bleeder circuit for use in a power supply of a lighting system includes a first terminal to be coupled to a first input of the power supply. A second terminal is to be coupled to a second input of the power supply. An edge detection circuit is coupled between the first and second terminals of the bleeder circuit. The edge detection circuit is coupled to output an edge detection signal in response to an input signal between the first and second inputs. A variable current circuit is coupled to the edge detection circuit and coupled between the first and second terminals of the bleeder circuit. The variable current circuit is coupled to conduct a bleeder current between the first and second terminals of the bleeder circuit in response to the edge detection signal.
    Type: Application
    Filed: April 18, 2012
    Publication date: October 24, 2013
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Jose Requinton Del Carmen, JR., Christian Pura Angeles
  • Publication number: 20130278167
    Abstract: A light emitting apparatus includes: a first transistor having a first end a second end, and a first control electrode; a light emitting device having a first electrode and a second electrode; a second transistor having a third end connected to the first end and a fourth end connected to the first electrode; a third transistor having a fifth end connected to the first electrode and a sixth end connected to an first power supply line; a fourth transistor having a seventh end connected to the first control electrode and a eighth end connected to the first end; a capacitive device which has a third electrode connected to first control electrode and a fourth electrode; and a fifth transistor having a ninth end connected to the fourth electrode and a tenth end connected to a data line.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 24, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Gakuji YAMAMOTO
  • Patent number: 8558472
    Abstract: A system and apparatus to reduce current peaking in notification appliances are described. The apparatus may include a current peaking compensation circuit comprising two or more transistors and one or more capacitors configured to reduce a start-up frequency of a pulse-width modulated signal during a first time period and to add a time constant decaying voltage across a resistor divider network to increase a reference voltage during the first time period. Other embodiments are described and claimed.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: October 15, 2013
    Assignee: SimplexGrinnell LP
    Inventor: Berj Redjebian
  • Publication number: 20130257309
    Abstract: A light emitting apparatus wherein, after setting a voltage of a light emitting luminance into a gate of the driving transistor, until setting a light emission controlling transistor at an electrically conducting state, a control signal changing toward a voltage of an opposite electrode of the light emitting element is supplied to the other terminal of the capacitor constructed such that an electro-conductive layer supplied with the control signal and a semiconductor layer forming the terminal of the driving transistor at the side of the light emitting element, a semiconductor layer forming a terminal of a transistor different from the driving transistor and connected to the terminal of the driving transistor at the side of the light emitting element, or an electro-conductive layer connected to the terminal of the driving transistor at the side of the light emitting element are formed so as to face through an insulating layer.
    Type: Application
    Filed: February 20, 2013
    Publication date: October 3, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Kouji Ikeda