Periodic Switch In One Of The Supply Circuits Patents (Class 315/172)
  • Patent number: 10679554
    Abstract: Provided is a pixel circuit. The pixel circuit comprises a driving transistor and a light-emitting element both coupled in series between a first level end and a second level end, and comprises a second transistor, a third transistor, a fourth transistor, a first capacitor and a second capacitor. The second capacitor is coupled between a control electrode of the driving transistor and a second end of the light-emitting element. A threshold voltage is stored by the first capacitor, so that threshold voltage compensation for the driving transistor and the light-emitting element is implemented, and therefore the non-uniformity of the display of the pixel circuit is compensated. Also provided is a display device, wherein a first control line and a light-emitting control line are both global lines. Also disclosed is a pixel circuit driving method.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: June 9, 2020
    Assignee: Peking University Shenzhen Graduate School
    Inventors: Shengdong Zhang, Xue Meng, Chuanli Leng
  • Patent number: 10424629
    Abstract: A display device includes: a substrate: a first electrode and a second electrode disposed on the substrate and facing each other; an emission layer disposed between the first electrode and the second electrode; a common voltage line disposed on the substrate and connected to the second electrode to transmit a common voltage; a thin film encapsulation layer covering the second electrode; auxiliary wiring disposed on the thin film encapsulation layer and connected to the common voltage line; a covering layer covering the auxiliary wiring; and a touch panel disposed on the covering layer. Thus, a voltage drop of the common voltage ELVSS may be minimized, and the luminance uniformity may be improved.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: September 24, 2019
    Assignee: Samsung Display Co., Ltd.
    Inventors: Sang Moo Choi, Won Kyu Kwak, Dong Wook Kim
  • Patent number: 10217804
    Abstract: A driving and scanning circuit, a display screen and a mobile terminal, comprise driving and scanning units which are distributed in an array, each comprising an AMOLED driving unit for driving an OLED to emit light and a fingerprint scanning unit for forming pixel capacitances, wherein the AMOLED driving unit comprises a first thin film transistor, a second thin film transistor, a third thin film transistor and an OLED, the first thin film transistor is connected with a driving voltage and a first switching voltage, the second thin film transistor and the third thin film transistor are respectively connected with an anode terminal and a cathode terminal, and the OLED is positioned between the cathode terminal and the second thin film transistor; the cathode terminal also comprises a fourth thin film transistor connected with a second driving voltage and a second switching voltage.
    Type: Grant
    Filed: August 17, 2016
    Date of Patent: February 26, 2019
    Assignee: HUIZHOU TCL MOBILE COMMUNICATION CO., LTD
    Inventor: Jianfeng Zhu
  • Patent number: 10212783
    Abstract: System controller and method for a power converter. For example, a system controller for a power converter includes a logic controller configured to generate a modulation signal, and a driver configured to receive the modulation signal, generate a drive signal based at least in part on the modulation signal, and output the drive signal to a switch to affect a current flowing through an inductive winding for a power converter. Additionally, the system controller includes a voltage-to-voltage converter configured to receive a first voltage signal, the modulation signal, and a demagnetization signal, and to generate a second voltage signal based at least in part on the first voltage signal, the modulation signal, and the demagnetization signal.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: February 19, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Zhuoyan Li, Liqiang Zhu, Jiqing Yang, Lieyi Fang
  • Patent number: 10190761
    Abstract: A retrofitted light fixture can include a power source that delivers primary power. The retrofitted light fixture can also include at least one light fixture component of an existing light fixture, where the at least one light fixture component, as part of the existing light fixture, was directly coupled to the power source. The retrofitted light fixture can further include an adapter coupled to the power supply and the at least one light source, where the adapter comprises a controller, where the adapter receives the primary power from the power source, where the controller delivers power to the at least one light fixture component based on instructions.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: January 29, 2019
    Assignee: Cooper Technologies Company
    Inventors: Philip D. Winters, Jyoti Kumar, Bryant A. Bilal, Seth Doheny
  • Patent number: 9497818
    Abstract: Apparatuses for controlling light modules (5) comprise first circuits (1) for detecting first control information transported via first signals and second circuits (2) for converting first control information into second control information. The second control information is transported via second signals. The first and second control information define light settings of the light modules (5) and have different representations. The first control information may be phase-cut information or first data. The second control information may be a parameter of the second signal or second data. The apparatus may further comprise a third circuit (3) for converting power from the first signals into third signals destined for power inputs (51) of the light modules (5). The second signals may be destined for control inputs (52) of the light modules (5). This way, a control of a light module (5) has been separated from powering the light module (5). Many more control options have become possible.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: November 15, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Johan-Paul Marie Gerard Linnartz, Anteneh Alemu Abbo, Yifeng Qiu
  • Publication number: 20150145848
    Abstract: A circuit is provided to drive a controlled current from a drive transistor into one electroluminescent element of a pixel array. The circuit is operable to compensate for threshold voltage variation of the drive transistor, thereby providing improved image quality. The circuit is suitable for implementation with p-channel MOSFETs and a conventional geometry having in order: substrate, TFT layer(s), anode, electroluminescent layer(s), cathode. A driving method for this circuit is provided. A display incorporating this circuit is provided. The circuit is operable to provide an inspection function prior to fabrication of the electroluminescent layer(s). An inspection method is provided.
    Type: Application
    Filed: November 18, 2014
    Publication date: May 28, 2015
    Inventor: Rajeev Rohatgi
  • Patent number: 9041300
    Abstract: A driving circuit and method for a pixel unit, the pixel unit and a display apparatus. The driving circuit for the pixel unit includes a switching unit, a storage capacitor (Cst), a first transistor (T1), a second transistor (T2) and a sixth transistor (T6). The switching unit includes a third transistor (T3), a fourth transistor (T4) and a fifth transistor (T5) for controlling a data signal current (Idata) to charge the storage capacitor (Cst). The driving circuit for the pixel unit expedites the speed for charging the storage capacitor (Cst); further, it has an excellent negative feedback function for the leak current of the storage capacitor (Cst), and ensures the stable operation of the circuit.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 26, 2015
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Haigang Qing, Xiaojing Qi
  • Patent number: 9018842
    Abstract: The present invention provides a driving circuit and method for a pixel unit, a pixel unit and a display apparatus. The driving circuit for a pixel unit comprises: a driving thin-film transistor, a first switching element, a storage capacitor and a driving control unit; said driving control unit is used to control said storage capacitor to be charged/discharged so as to control said driving thin-film transistor to operate in a saturation region, so that the threshold voltage Vth of said driving thin-film transistor is compensated by utilizing the gate-source voltage of said driving thin-film transistor. The present invention can address the problems of ununiformity and attenuation of the brightness of OLED panel.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: April 28, 2015
    Assignees: Boe Technology Group Co. Ltd., Chengdu Boe Optoelectronics Technology Co., Ltd.
    Inventors: Wen Tan, Xiaojing Qi, Like Hu, Young Yik Ko
  • Publication number: 20150049126
    Abstract: A pixel includes a first transistor, an organic light emitting diode, and a second transistor having a terminal connected between the first transistor and the organic light emitting diode. The first transistor is a driving transistor. The second transistor controls flow of leakage current along a signal path that bypasses the organic light emitting diode.
    Type: Application
    Filed: May 15, 2014
    Publication date: February 19, 2015
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventor: Dong-Hun JUNG
  • Patent number: 8957589
    Abstract: An LED light-adjustment driver module includes a duty cycle detection unit, a current output unit, a comparator and a capacitor unit. The first input end of comparator is connected to capacitor unit, and the second input end of comparator inputs a default threshold voltage. The duty cycle detection unit is for receiving externally inputted PWM signal and detecting the duty cycle of the PWM signal; when the duty cycle detection unit detects the duty cycle is less than a default threshold, the current output unit increases the output current or the capacitor unit reduces the capacitance provided to reduce the time for the voltage of the capacitor unit to reach the threshold voltage. Hence, the charging speed of the capacitor unit can be increased.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: February 17, 2015
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventor: Fei Li
  • Publication number: 20150029079
    Abstract: A drive circuit for a light emitting element small in the number of components which can correct a threshold voltage of a drive transistor is provided. The drive circuit includes a line that is connected between two reference voltages, a light emitting element on the line, a drive transistor on the line, a first capacitor connected between a gate and a drain of the drive transistor, a second capacitor connected between the gate and a source of the drive transistor, a first switching element connected to the gate of the drive transistor and turning on during a signal writing period to supply a signal voltage to the gate of the drive transistor, and a second switching element disposed on the line and having one side connected to the source of the drive transistor, and the second capacitor.
    Type: Application
    Filed: July 24, 2014
    Publication date: January 29, 2015
    Inventors: Toshio MIYAZAWA, Mitsuhide MIYAMOTO
  • Publication number: 20150002499
    Abstract: An organic light emitting display includes a plurality of pixels. Each pixel includes an organic light emitting diode, a first driver, and a second driver. The first driver supplies a predetermined current to the OLED based on a current data signal or first data signal. The second driver is coupled between the first driver and OLED, and controls the coupling between the first driver and OLED based on a second data signal.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 1, 2015
    Inventors: Hyung-Soo KIM, Chul-Kyu KANG, Dong-Gyu KIM, Yong-Jae KIM
  • Publication number: 20140347253
    Abstract: A compensation unit includes a current source unit, a current sink unit, a sensing resistor, a comparator, and a memory. The current source unit is configured to supply a first reference current to a first node. The current sink unit is configured to sink a second reference current from the first node. The sensing resistor is coupled between the first node and a second node. The comparator is configured to: compare a voltage at the first node with a voltage at the second node, and output a comparison result signal based on the comparison. The memory unit is configured to: store compensation data related to operational disparity of at least one organic light emitting diode and/or of at least one driving transistor, output the compensation data, and modify the compensation data based on the comparison result signal.
    Type: Application
    Filed: September 25, 2013
    Publication date: November 27, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventor: Wook LEE
  • Publication number: 20140333686
    Abstract: A pixel for a display panel includes an organic light emitting diode and two driving transistors. The first driving transistor supplies current from a first power source to the organic light emitting diode based on a voltage applied to a first node. The second driving transistor coupled between an electrode of the first driving transistor and the organic light emitting diode. The second driving transistor is turned on or turned off corresponding to a data signal supplied from a data line. A third transistor, coupled between a gate electrode of the second driving transistor and the data line, is turned on when a scan signal is supplied to a scan line. A compensation circuit is coupled to the first node to compensate for a voltage corresponding to a threshold voltage of the first driving transistor.
    Type: Application
    Filed: May 5, 2014
    Publication date: November 13, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventors: Jong-Soo KIM, Kyoung-Soo LEE, Myung-Ho LEE
  • Publication number: 20140333214
    Abstract: A pixel circuit including a light emitting element outputting a gray scale based on a current supplied thereto, a first transistor configured to control an amount of current supplied to the light emitting element based on a gray scale data voltage supplied to a gate electrode of the first transistor, a second transistor connected between the gate electrode of the first transistor and an initialization voltage, a third transistor connected between the gate electrode of the first transistor and a first terminal of the first transistor; a fourth transistor connected between the first terminal of the first transistor and the light emitting element, and a fifth transistor connected between a second terminal of the first transistor and a data line. The data line is selectively supplied with the gray scale data voltage and a power supply voltage for light emitting of the light emitting element to the fifth transistor.
    Type: Application
    Filed: May 5, 2014
    Publication date: November 13, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Takeshi OKUNO, Masayuki KUMETA, Eiji KANDA, Ryo ISHII, Naoaki KOMIYA
  • Publication number: 20140312784
    Abstract: The present disclosure relates to the field of organic light-emitting display, and provides a pixel circuit, a driving method thereof, an organic light-emitting display panel and a display apparatus, comprising a driving transistor, a first storage capacitor, a collecting unit, a writing unit and a light-emitting unit; wherein, the collecting unit is used. for collecting the threshold voltage of the driving transistor and storing the threshold voltage into the first storage capacitor, under the control of the first scan signal; the writing unit is used for storing the data voltage inputted from the input terminal for the data voltage under the control of the second scan signal; and the light-emitting unit is used for emitting lights, driven by the data voltage and a voltage inputted from the input terminal for the controllable low voltage, under the control of the light-emitting control signal.
    Type: Application
    Filed: May 20, 2013
    Publication date: October 23, 2014
    Applicant: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Jingwen Yin, Zhongyuan Wu
  • Publication number: 20140292625
    Abstract: A display device includes a normal pixel including a first driving transistor and a first compensation transistor connected to a gate and drain of the first driving transistor, and a compensation pixel including a second driving transistor and a second compensation transistor connected to a gate and drain of the second driving transistor. The second compensation transistor is open.
    Type: Application
    Filed: March 20, 2014
    Publication date: October 2, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventors: Yul-Kyu LEE, Sun PARK, Ji-Hoon SONG
  • Publication number: 20140231243
    Abstract: This disclosure describes a non-dissipative snubber circuit configured to boost a voltage applied to a load after the load's impedance rises rapidly. The voltage boost can thereby cause more rapid current ramping after a decrease in power delivery to the load which results from the load impedance rise. In particular, the snubber can comprise a combination of a unidirectional switch, a voltage multiplier, and a current limiter. In some cases, these components can be a diode, voltage doubler, and an inductor, respectively.
    Type: Application
    Filed: February 20, 2014
    Publication date: August 21, 2014
    Applicant: Advanced Energy Industries, Inc.
    Inventor: Kenneth W. Finley
  • Publication number: 20140232276
    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: Application
    Filed: April 24, 2014
    Publication date: August 21, 2014
    Applicant: Sony Corporation
    Inventors: Keisuke Omoto, Shinichi Teraguchi
  • Publication number: 20140191669
    Abstract: The present invention provides a driving circuit and method for a pixel unit, a pixel unit and a display apparatus. The driving circuit for a pixel unit comprises: a driving thin-film transistor, a first switching element, a storage capacitor and a driving control unit; said driving control unit is used to control said storage capacitor to be charged/discharged so as to control said driving thin-film transistor to operate in a saturation region, so that the threshold voltage Vth of said driving thin-film transistor is compensated by utilizing the gate-source voltage of said driving thin-film transistor. The present invention can address the problems of ununiformity and attenuation of the brightness of OLED panel.
    Type: Application
    Filed: November 1, 2012
    Publication date: July 10, 2014
    Applicants: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Wen Tan, Xiaojing Qi, Like Hu, Young Yik Ko
  • Publication number: 20140175992
    Abstract: Provided are a pixel circuit, a driving method thereof, and a display device, which relate to the field of the display technology and can effectively compensate variation in currents due to ununiformity and drift of threshold voltages of driving Thin Film Transistors as well as ununiformity of OLEDs. The pixel circuit comprises: a light-emitting element; a driving TFT; a first TFT having a drain connected to a gate of the driving TFT; a second TFT having a drain connected to a source of the driving TFT; a third TFT having a source connected to a drain of the driving TFT, and a drain connected to the light-emitting element; a fourth TFT having a source connected to the gate of the driving TFT, and a drain connected to the drain of the driving TFT; a fifth TFT having a drain connected to the source of the driving TFT; and a capacitor.
    Type: Application
    Filed: December 18, 2013
    Publication date: June 26, 2014
    Applicant: BEIJING BOE OPTOELECTRONICS TECHNOLOGY CO., LTD
    Inventor: Shengji YANG
  • Publication number: 20140145625
    Abstract: To prevent an influence of normally-on characteristics of the transistor which a clock signal is input to a terminal of, a wiring to which a first low power supply potential is appled and a wiring to which a second low power supply potential lower than the first low power supply potential is applied are electrically connected to a gate electrode of the transistor. A semiconductor device including the transistor can operate stably.
    Type: Application
    Filed: November 26, 2013
    Publication date: May 29, 2014
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei YAMAZAKI, Hiroyuki MIYAKE, Daisuke MATSUBAYASHI
  • Publication number: 20140145624
    Abstract: An ignition system includes an ignition plug, a discharge power supply for applying a high voltage to the gap of the ignition plug, a high-frequency power supply for supplying a high-frequency current to the gap, a matching unit provided between the ignition plug and the high-frequency power supply, and a mixer through which currents output from the two power supplies flow. An oscillation frequency fs (Hz) which maximizes the current flowing between the matching unit and the mixer when spark discharge is generated and an oscillation frequency fo (Hz) which maximizes the current flowing between the matching unit and the mixer when spark discharge is not generated satisfy a relation fs/fo?0.85. Thus, a current whose oscillation frequency is equal to the oscillation frequency fs flows between the matching unit and the mixer when spark discharge is not generated.
    Type: Application
    Filed: November 22, 2013
    Publication date: May 29, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Kenji BAN, Tatsunori YAMADA, Tomokatsu KASHIMA, Katsutoshi NAKAYAMA
  • Publication number: 20140139124
    Abstract: There is provided an organic light emitting display capable of displaying an image with uniform brightness while securing a high aperture ratio. The organic light emitting display includes a plurality of first subpixels and a plurality of second subpixels alternately arranged in a single column line and a third subpixel arranged in another column line adjacent to the first subpixels and the second subpixels. First subpixels positioned in the single column line may be alternately electrically coupled to different data lines.
    Type: Application
    Filed: March 12, 2013
    Publication date: May 22, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventors: Chang-Yeop Kim, Seung-Kyu Lee
  • Publication number: 20140139123
    Abstract: The present invention provides an LED light-adjustment driver module, which includes a duty cycle detection unit, a current output unit, a comparator and a capacitor unit. The first input end of comparator is connected to capacitor unit, and the second input end of comparator inputs a default threshold voltage. The duty cycle detection unit is for receiving externally inputted PWM signal and detecting the duty cycle of the PWM signal; when the duty cycle detection unit detects the duty cycle is less than a default threshold, the current output unit increases the output current or the capacitor unit reduces the capacitance provided to reduce the time for the voltage of the capacitor unit to reach the threshold voltage. The present invention can increase the charging speed of the capacitor unit.
    Type: Application
    Filed: November 27, 2012
    Publication date: May 22, 2014
    Applicant: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventor: Fei Li
  • Publication number: 20140117861
    Abstract: This disclosure describes a non-dissipative snubber circuit configured to boost a voltage applied to a load after the load's impedance rises rapidly. The voltage boost can thereby cause more rapid current ramping after a decrease in power delivery to the load which results from the load impedance rise. In particular, the snubber can comprise a combination of a unidirectional switch, a voltage multiplier, and a current limiter. In some cases, these components can be a diode, voltage doubler, and an inductor, respectively.
    Type: Application
    Filed: April 22, 2013
    Publication date: May 1, 2014
    Applicant: ADVANCED ENERGY INDUSTRIES, INC.
    Inventors: Kenneth W. Finley, David Christie
  • Publication number: 20140117862
    Abstract: A driving circuit and method for a pixel unit, the pixel unit and a display apparatus. The driving circuit for the pixel unit includes a switching unit, a storage capacitor (Cst), a first transistor (T1), a second transistor (T2) and a sixth transistor (T6). The switching unit includes a third transistor (T3), a fourth transistor (T4) and a fifth transistor (T5) for controlling a data signal current (Idata) to charge the storage capacitor (Cst). The driving circuit for the pixel unit expedites the speed for charging the storage capacitor (Cst); further, it has an excellent negative feedback function for the leak current of the storage capacitor (Cst), and ensures the stable operation of the circuit.
    Type: Application
    Filed: November 30, 2012
    Publication date: May 1, 2014
    Applicants: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Haigang Qing, Xiaojing Qi
  • Patent number: 8711444
    Abstract: A light-source control device includes a light source including a first light emitter for emitting light and a second light emitter for emitting light due to the light emitted by the first light emitter; a constant current unit configured to maintain a current constant that is input via the light source from a power supply; a switching unit configured to switch the current to be input to the constant current unit at a designated duty ratio and cycle; and a control unit configured to control the current applied to the light source so that a rise transition time and a fall transition time of the current applied to the light source are nearly equal to each other.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: April 29, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Tadaaki Oyama
  • Publication number: 20140111506
    Abstract: A pixel circuit comprising a plurality of pixel units, wherein each pixel unit comprises a data line (50), a charge gate line (40), a common electrode line (60), a cache module (10), a pixel circuit module (20), and a common gate line (30); the cache module (10) is connected to the charge gate line (40) that supplies a control signal for the cache module (10); an input of the cache module (10) is connected to the data line (50), at the time of supplying a enable control signal by the charge gate line (40), the cache module (10) receives and stores a display signal supplied by the data line (50); the pixel circuit module (20) is connected to the common gate line (30) that supplies a control signal for the pixel circuit module (20); an output of the cache module (10) is connected to an input of the pixel circuit module (20), at the time of supplying an enable control signal by the common gate line (30), the display signal stored in the cache module (10) is written into the pixel circuit module (20).
    Type: Application
    Filed: December 11, 2012
    Publication date: April 24, 2014
    Applicant: BOE Technology Group Co., Ltd.
    Inventors: Mi Zhang, Yun Sik Im
  • Publication number: 20140111562
    Abstract: In embodiments of the present disclosure, there are provided an AMOLED driving circuit, an AMOLED driving method and an AMOLED display device. The AMOLED driving circuit includes a light emitting device, a first switching transistor, a voltage regulator, a driving transistor and a capacitor. The driving transistor in the AMOLED driving circuit drives the light emitting device to emit light under the control of the voltage regulator, a driving current provided by the driving transistor is independent of Vth of the driving transistor, so that the driving current flowing through the light emitting device is prevented from being affected by the poor uniformity and drift of Vth, the uniformity in the driving currents flowing through the light emitting devices is enhanced, and thus the uniformity in the brightness of the AMOLED is improved.
    Type: Application
    Filed: November 2, 2012
    Publication date: April 24, 2014
    Applicant: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Bo Wu, Wen Tan, Xiaojing Qi
  • Publication number: 20130307421
    Abstract: An object is to enable application of forward/reverse voltage to or forward/reverse current to a display element and to lower power consumption of a driver circuit for driving a pixel. A memory storing the potential of a source signal line input through a switch, a first transistor whose gate is supplied with one output of the memory, a second transistor whose gate is supplied with the other output of the memory, a display element electrically connected to one of a source a drain of a first transistor and one of a source and a drain of a second transistor, a power source line electrically connected to the other of the source and the drain of the first transistor and the other of the source and the drain of the second transistor, and a counter power source electrically connected to the display element are included.
    Type: Application
    Filed: May 9, 2013
    Publication date: November 21, 2013
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Yoshifumi TANADA
  • Publication number: 20130264950
    Abstract: A display device having at least a plurality of pixel circuits, connected to signal lines to which data signals in accordance with luminance information are supplied, arranged in a matrix, wherein pixel circuits of odd number columns and even number columns adjacent sandwiching an axis in a column direction parallel to an arrangement direction of the signal lines have a mirror type circuit arrangement symmetric about the axis of the column direction, and there are lines different from the signal lines between signal lines of adjacent pixel circuits.
    Type: Application
    Filed: February 15, 2013
    Publication date: October 10, 2013
    Inventor: Mitsuru Asano
  • Publication number: 20130249413
    Abstract: A pixel circuit includes a control switch module, a capacitor, a driving switch, and a light emitting element. The control switch module is enabled and disabled according to a scan signal. A first end of the capacitor can be electrically connected to the control switch module, and a second end of the capacitor can be electrically connected to a voltage level. The capacitor receives and stores a predetermined driving voltage when the control switch module is enabled. Area of the capacitor occupies more than 20% area of the pixel circuit. The driving switch can be electrically connected to the capacitor and a voltage source for controlling a driving current flowing through the driving switch according to the predetermined driving voltage stored in the capacitor. The light emitting element emits light according to the driving current flowing through the driving switch.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 26, 2013
    Applicants: WINTEK CORPORATION, Wintek (China) Technology Ltd.
    Inventors: Chun-Ho Chen, Ching-Fu Hsu, Yu-Hung Chang, Kuang-Wei Li, Wen-Tui Liao
  • Publication number: 20130241421
    Abstract: A hybrid power supply for a high intensity light includes a power supply coupled to the high intensity light, wherein the power supply has a power rating less than a power rating for the high intensity light, and a battery, the battery having a power rating greater than or equal to the power rating for the high intensity light. A switch is coupled between the high intensity light and the battery, such that when the switch is closed the battery is coupled to the high intensity light, and such that when the switch is open the battery is not coupled to the high intensity light.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 19, 2013
    Applicant: Luminys Systems Corp.
    Inventor: David Pringle
  • Patent number: 8497637
    Abstract: A constant voltage dimmable LED (Light Emitting Diode) driver is disclosed that is compatible with all types of dimmers, including conventional phase cut (TRIAC) dimmers, and behaves like a conventional constant voltage driver which can be connected to any size of LED load that has a matching voltage rating. The driver produces a continuous train of pulses for driving the LED load and obtains an averaged measure of the voltage at the AC input for controlling the duty cycle of the continuous train of pulses. Therefore, when the averaged measure of the voltage at the AC input is reduced by a dimmer, the duty cycle reduces, resulting in a dimmed LED. The driver can be created by adding a few components to a conventional wide input range AC-DC converter without or with very little modifications.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: July 30, 2013
    Inventor: Gang Gary Liu
  • Publication number: 20130187554
    Abstract: An image display device includes: an organic EL element, a first electrostatic capacitor, a driving transistor having a gate connected to a first electrode of the first electrostatic capacitor and a source connected to an anode of the organic EL element, a second electrostatic capacitor having an electrode connected to a second electrode of the first electrostatic capacitor, a negative power source line which determines the potential of a cathode of the organic EL element, and a scanning line driving circuit which controls a first switching transistor, a second switching transistor, and a third switching transistor. In a non-light-emitting period, the scanning line driving circuit sets, during a period from a start of a reset period to an end of the non-light-emitting period, a fixed voltage corresponding to the potential of the negative power source line to the source electrode of the driving transistor.
    Type: Application
    Filed: March 11, 2013
    Publication date: July 25, 2013
    Applicant: PANASONIC CORPORATION
    Inventor: PANASONIC CORPORATION
  • Publication number: 20130154488
    Abstract: A dimmable LED driver with multiple power sources.
    Type: Application
    Filed: November 11, 2012
    Publication date: June 20, 2013
    Inventors: Laurence P. Sadwick, William B. Sackett, Jared Wyckoff
  • Publication number: 20130121356
    Abstract: An apparatus includes a first input transistor to include a base receiving a drive signal for an object to be driven, a first current source connected to an emitter side of the first input transistor and configured to control a modulation amplitude of a signal flowing to a collector of the first input transistor, a second current source connected to a collector side of the first input transistor and configured to control a biased current of a signal flowing to the collector, a first inductor configured to dispose between the collector and the second current source, and an output element connected between the second current source and the first inductor and configured to output, to the object, a current signal of which the modulation amplitude is controlled by the first current source and the biased current is controlled by the second current source.
    Type: Application
    Filed: September 25, 2012
    Publication date: May 16, 2013
    Applicant: FUJITSU LIMITED
    Inventor: FUJITSU LIMITED
  • Patent number: 8415901
    Abstract: In embodiments of the present invention improved capabilities are described for systems and methods that employ a control component and/or power source integrated in an LED based light source to control and/or power the LED light source wirelessly. In embodiments, the LED based light source may take the form of a standard light bulb that plugs into a standard lighting socket or fixture.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: April 9, 2013
    Inventors: Michael V. Recker, David B. Levine
  • Patent number: 8324822
    Abstract: An apparatus is disclosed that is capable of delivering substantially constant power to a luminous load with variation in the input voltage and the environment temperature. The apparatus may be further adapted to vary the power supplied to the luminous load based on changes in the input voltage produced by a phase control dimmer or external device. Additionally, if the input voltage is changed due to a user controlling a dimmer device to control the brightness of the luminous load, the apparatus is able to control the power delivered to the load in response to the dimmer device. Additionally, the apparatus is adapted to allow the luminous output light intensity to be controlled by changes in a remote control voltage source or variable resister and draws near unity power factor power from the AC input throughout the dimming range when not used with phase control dimmer. The remote control or variable resistor can operate simultaneously with a dimmer to achieve multiple controls for the light output.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: December 4, 2012
    Assignee: Ace Power International, Inc.
    Inventor: Chunghang Peng
  • Publication number: 20120236373
    Abstract: A light-source control device includes a light source including a first light emitter for emitting light and a second light emitter for emitting light due to the light emitted by the first light emitter; a constant current unit configured to maintain a current constant that is input via the light source from a power supply; a switching unit configured to switch the current to be input to the constant current unit at a designated duty ratio and cycle; and a control unit configured to control the current applied to the light source so that a rise transition time and a fall transition time of the current applied to the light source are nearly equal to each other.
    Type: Application
    Filed: March 15, 2012
    Publication date: September 20, 2012
    Applicant: RICOH COMPANY, LIMITED
    Inventor: Tadaaki Oyama
  • Patent number: 8115399
    Abstract: Organic light emitting diode (OLED) light source includes a plurality of stacked organic light emitting diode units comprised of a removable topmost organic light emitting diode unit and one or more removable underlying organic light emitting diode units. A power source is in electrical communication with the anode and the cathode of the topmost organic light emitting diode unit, wherein the underlying organic light emitting diode units are free from contact with the power source. As such, each OLED is sequentially operated upon removal of the topmost OLED unit, thereby providing redundancy as well as extending the operating lifetime of the OLED light source. Also disclosed are processes for operating the OLED light source.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: February 14, 2012
    Assignee: General Electric Company
    Inventor: Christian Maria Anton Heller
  • Patent number: 8044597
    Abstract: A drive circuit for a fluorescent display that can prevent generation of reactive power in a Zener diode used to generate a cutoff bias voltage. In one embodiment, the drive circuit operates as a single ended primary inductor converter (SEPIC) circuit and includes an input side closed circuit, an output side closed circuit, and a coupling capacitor connecting the two closed circuits. The input side closed circuit includes an input power source, a first inductor and a switching element. The output side closed circuit includes a second inductor, a diode and a second capacitor. A filament of the fluorescent display is connected to the second capacitor. One end of a Zener diode is connected to a negative potential side of the filament and the other end of the Zener diode is connected to an input power source.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: October 25, 2011
    Assignee: Futaba Corporation
    Inventor: Hideki Oku
  • Patent number: 7915832
    Abstract: A drive circuit for driving a plasma display panel (PDP) includes a pulse voltage generator that contains main switching elements disposed on a high voltage side and on a low voltage side, is operable to generate a pulse voltage by operating the main switching elements in accordance with an output voltage from a first power supply and apply the pulse voltage to a PDP scan electrode and sustain electrode, and a reset voltage generator operable to generate a reset voltage in accordance with an output voltage from a second power supply and apply it to the PDP. The pulse voltage generator contains a first diode that prevents the voltage output by the reset voltage generator from being applied backward to the first power supply and a first switching element connected to the first diode in parallel.
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: March 29, 2011
    Assignee: PANASONIC Corporation
    Inventors: Yasuhiro Arai, Hideki Nakata, Toshikazu Nagaki, Satoshi Ikeda
  • Publication number: 20100201270
    Abstract: The present invention provides a light emitting diode light tube with two ends respectively having a pair of electrode pins for receiving a first and second AC input voltages. The light tube includes an AC switching power supply including a first input rectifier/filter circuit rectifying/filtering the first AC input voltage to generate a first rectified/filtered voltage, and a power conversion circuit coupled to the first input rectifier/filter circuit, and having a second input rectifier/filter circuit rectifying/filtering the second AC input voltage to generate a second rectified/filtered voltage, wherein the power conversion circuit generates a output voltage in response to the first and second rectified/filtered voltages. The AC switching power supply provides a constant output voltage and current to the LED, which avoids flicker in the LED light tube.
    Type: Application
    Filed: January 19, 2010
    Publication date: August 12, 2010
    Applicant: LEDTECH ELECTRONICS
    Inventor: CHENG-HSIUNG KUO
  • Patent number: 7742064
    Abstract: Variation occurs in transistor characteristics. The present invention relates to a signal line driver circuit comprising a plurality of current source circuits respectively corresponding to a plurality of wirings, characterized in that: the plurality of current source circuits each comprise capacitor means and supply means; and the plurality of current source circuits each convert a supplied current into a voltage in accordance with a video signal, and supply a current corresponding to the converted voltage.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: June 22, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd
    Inventor: Hajime Kimura
  • Patent number: 7642724
    Abstract: A light emitting element driving circuit, which can achieve accurate/high-speed operation even at low voltage supply voltage, comprises: driving current supply, connected to light emitting element in series between first and second power supplies, to supply driving current to the light emitting element according to the voltage of control terminal; current determiner to determine and output the current according to an output light amount of the light emitting element; current/voltage converter to convert the determined current into voltage and output it to the control terminal of the driving current supply if control signal is in a first state, and to electrically shield its output voltage terminal from the control terminal of the driving current supply if the control signal is in a second state; and resetter to connect the control terminal of the driving current supply to the second power supply if the control signal is in the second state.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: January 5, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Muto, Masanobu Oomura
  • Patent number: 7439682
    Abstract: A circuit for driving the current for inductive loads such as a electron beam deflection coil for an x-ray generator system. The circuit includes two selectable voltage levels which are provided by a high level voltage source and a low level voltage source or, alternatively, by a low level voltage source and a boosting converter. A plurality of switches for selecting the voltage source allow only one voltage source to be connected to the load at any given time, and for selecting the polarity of the current through the coil. The high level voltage source is selected when the load is charging or discharging. The low level voltage source is selected when the load is operating in a constant current mode, where a high frequency switching device uses the low level voltage source to generate a pulse width modulation waveform according to a reference current duty cycle to control the voltage across the load.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: October 21, 2008
    Assignee: GE Homeland Protection, Inc.
    Inventors: Antonio Caiafa, Juan Antonio Sabate
  • Publication number: 20080238330
    Abstract: A light emitting element driving circuit, which can achieve accurate/high-speed operation even at low voltage supply voltage, comprises: driving current supply, connected to light emitting element in series between first and second power supplies, to supply driving current to the light emitting element according to the voltage of control terminal; current determiner to determine and output the current according to an output light amount of the light emitting element; current/voltage converter to convert the determined current into voltage and output it to the control terminal of the driving current supply if control signal is in a first state, and to electrically shield its output voltage terminal from the control terminal of the driving current supply if the control signal is in a second state; and resetter to connect the control terminal of the driving current supply to the second power supply if the control signal is in the second state.
    Type: Application
    Filed: March 13, 2008
    Publication date: October 2, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takashi Muto, Masanobu Oomura