Diverse-type Energizing Or Bias Supplies To Different Electrodes Patents (Class 315/169.1)
  • Patent number: 8232932
    Abstract: The present invention suppresses the generation of a leak current that accompanies the polarity inversion of the voltage waveform of the opposing electrode. The display device that performs display by sequentially scanning a plurality of scan signal lines in a single cycle period comprises: a plurality of data signal lines that intersect the scan signal lines; a pixel electrode that is connected to the data signal lines; and an opposing electrode that is disposed opposite the pixel electrode and for which the polarity of an application voltage is inverted in each of the cycle periods. The cycle period includes a scan period in which one full scan of the scan signal lines is performed and a non-scan period in which the scan signal lines are not scanned.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: July 31, 2012
    Assignee: Citizen Holdings Co., Ltd.
    Inventors: Rintarou Takahashi, Takashi Akiyama
  • Patent number: 8228001
    Abstract: A group of novel power conversion concept is developed with this invention for LED and OLED drive applications. The concept utilizes a single power conversion stage to fulfill multiple functions, including Power Factor Correction, DC voltage to DC current conversion, or DC voltage to DC voltage conversion etc. that are necessary for driving LED devices from an AC power input. Multiple dimming control schemes have also been developed to facilitate wide range of application requirements and enable the system to work with different input power format including AC mains power and variable AC voltage from the existing AC dimmer installations.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: July 24, 2012
    Assignee: Suntec Enterprises
    Inventor: Jianping Fan
  • Patent number: 8228277
    Abstract: The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: July 24, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yasunori Yoshida, Hajime Kimura, Shinji Maekawa, Osamu Nakamura, Shunpei Yamazaki
  • Patent number: 8223095
    Abstract: An organic light-emitting display device having a pixel unit to test pixels, wherein the organic light-emitting display device includes: a substrate; a display unit located on the substrate; a plurality of first scan lines located in the display unit; and a second scan line located in the display unit and separated from the first scan lines, wherein a plurality of pixel units, except one test pixel unit located in at least one corner of the display unit, are electrically connected to the first scan lines, and the test pixel unit that is not connected to the first scan lines is electrically connected to the second scan line.
    Type: Grant
    Filed: August 21, 2006
    Date of Patent: July 17, 2012
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Eun-Ah Kim
  • Patent number: 8223092
    Abstract: A plasma display device driven during an address period and a sustain period includes a discharge cell defined by a scan electrode, a sustain electrode, and an address electrode, an addressing circuit for providing an address voltage to the address electrode, and an addressing compensation circuit for storing voltage corresponding to a displacement current generated during a sustain period to be utilized during the address period. The addressing compensation circuit includes a switch coupled with the address electrode through which the displacement current supplied from the scan electrode and the sustain electrode is received during the sustain period, and a capacitor coupled with the switch for storing the voltage corresponding to the displacement current received through the switch.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: July 17, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Sang-Gu Lee
  • Patent number: 8217878
    Abstract: A display device is disclosed. The display device includes: a pixel array unit and a driving unit which drives the pixel array unit. The pixel array unit includes rows of first scanning lines and second scanning lines, columns of signals, pixels in a matrix state arranged at portions where the scanning lines and the signal lines cross each other and power supply lines and ground lines supplying power to respective pixels. The driving unit includes a first scanner performing line-sequential scanning to pixels by each row by supplying a first control signal to each first scanning line sequentially, a second scanner supplying a second control signal to each second scanning line sequentially so as to correspond to the line-sequential scanning and a signal selector supplying a video signal to rows of signal lines so as to correspond to the line-sequential scanning.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: July 10, 2012
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Takao Tanikame, Katsuhide Uchino
  • Patent number: 8217860
    Abstract: A method of measuring a panel current in an active matrix organic electroluminescence display panel, wherein when a current flowing through a display panel when one or a plurality of pixels are caused to emit light is measured, a flow-in current flowing into the display panel from a side of a high voltage and a flow-out current flowing out from the display panel toward a side of a low voltage are simultaneously measured, and a value of a panel current is determined using both obtained measurement results.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: July 10, 2012
    Assignee: Global OLED Technology LLC
    Inventors: Seiichi Mizukoshi, Makoto Kohno, Kouichi Onomura
  • Patent number: 8212488
    Abstract: A light emitting device and an element substrate which are capable of suppressing variations in the luminance intensity of a light emitting element among pixels due to characteristic variations of a driving transistor without suppressing off-current of a switching transistor low and increasing storage capacity of a capacitor. According to the invention, a depletion mode transistor is used as a driving transistor. The gate of the driving transistor is fixed in its potential or connected to the source or drain thereof to operate in a saturation region with a constant current flow. A current controlling transistor which operates in a linear region is connected in series to the driving transistor, and a video signal for transmitting a light emission or non-emission of a pixel is inputted to the gate of the current controlling transistor through a switching transistor.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: July 3, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Mitsuaki Osame, Aya Anzai, Yu Yamazaki
  • Patent number: 8207672
    Abstract: A technique for achieving both discharge voltage reduction and discharge stabilization in a PDP and the like is provided. This PDP manufacturing method includes, for a structure of a front plate structure (11) to be exposed to a discharge space (30) to be filled with a discharge gas, a step of forming a first layer (4) having an effect of discharge protective layer on a dielectric layer (3), a step of forming a second layer (5) for protecting the first layer on the first layer, and a step of forming a third layer (6) of a powder for discharge stabilization to be exposed to the discharge space (30), the steps being performed in vacuum manufacturing process. And, the structure is made such that a surface of the first layer is exposed to the discharge space (30) by a step of removing the second layer by an aging discharge in the discharge space (30).
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: June 26, 2012
    Assignee: Hitachi, Ltd
    Inventors: Keiichi Betsui, Shinya Fukuta, Tadayoshi Kosaka, Minoru Hasegawa, Hajime Inoue, Yoshiho Seo, Tomonari Misawa
  • Patent number: 8203260
    Abstract: A color temperature tunable white light source comprises: first and second LED arrangements operable to emit light of first and second wavelength range respectively that are configured such that their combined light output, which comprises light generated by the source, appears white in color. One or both LED arrangements comprises a phosphor provided remote to an associated LED operable to generate excitation radiation and to irradiate the phosphor such that it emits light of a different wavelength range, wherein the light emitted by the LED arrangement comprises the combined light from the LED and phosphor. The color temperature of output white light is tunable by controlling the relative light outputs of the LED arrangements by for example controlling the relative magnitude of the drive currents of the LEDs or a duty cycle of a pulse width modulated drive current.
    Type: Grant
    Filed: April 13, 2007
    Date of Patent: June 19, 2012
    Assignee: Intematix Corporation
    Inventors: Yi-Qun Li, Yi Dong, Xiaofeng Xu
  • Publication number: 20120146985
    Abstract: A method of driving a display panel includes generating a gate on voltage, generating first and second gate off voltages based on an external voltage in a first operating mode, and first and second gate off voltages based on the gate on voltage in a second operating mode, generating a clock signal based on the gate on voltage and the second gate off voltage and outputting a gate voltage generated based on the clock signal and the first and second gate off voltages to a gate line of the display panel.
    Type: Application
    Filed: July 12, 2011
    Publication date: June 14, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Whee-Won LEE, Seung-Hwan MOON, Jae-Hoon LEE, Jun-Yong SONG
  • Patent number: 8198810
    Abstract: A method of manufacturing an electromagnetic wave shield for a plasma display panel having a first panel having an image-displaying surface, the method including coating the image-displaying surface of the first panel with a coating solution to form a hydrophobic layer; applying a conductive ink to the hydrophobic layer utilizing an ink-jet applicator to form a pattern of the conductive ink; and heating the conductive ink and the hydrophobic layer to form a conductive mesh pattern on the hydrophobic layer.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: June 12, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jaeseok Lim, Sangyoung Jin, Minhyung Kim, Heeyoul Yoon, Ria Ju, Younghak Pyo, Seunghyuck Paek, Sangchul Seo
  • Patent number: 8193731
    Abstract: An LED lamp driven by alternating current includes at least a first constant-current supplying device, at least a second constant-current supplying device and at least an LED load. A terminal of the first constant-current supplying device is connected to the first connecting terminal of the AC power source. A terminal of the second constant-current supplying device is connected to the second connecting terminal of the AC power source. The LED load is connected between the first constant-current supplying device and the second constant-current supplying device in series. Through the current limiting function of the first constant-current supplying device and the second constant-current supplying device, the LED lamp may be protected.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: June 5, 2012
    Inventors: Ying-Chia Chen, Hui-Hua Lien
  • Patent number: 8194004
    Abstract: A plasma display driving method capable of displaying a vigorous image having enhanced maximum luminance and contrast. For this purpose, one field is divided into a plurality of sub-fields each including a sustain period. In the sustain period, the number of sustain pulses obtained by multiplying a proportionality factor by a brightness weight set for each of the sub-fields are applied to display electrode pairs to generate sustaining discharge in discharge cells having generated addressing discharge therein. Thus, the total number of the sustain pulses in one field period can be changed. When a predetermined image meeting predetermined conditions is displayed, the total number of the sustain pulses in one field period is made larger than those in the case where the other normal images are displayed.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: June 5, 2012
    Assignee: Panasonic Corporation
    Inventors: Kenji Nishimura, Akira Yawata, Hironari Taniguchi
  • Patent number: 8188668
    Abstract: An image display apparatus includes a rear plate provided with a plurality of electron-emitting devices, each electron-emitting device emitting electron; a face plate disposed opposite the plurality of electron-emitting devices and provided with a plurality of pixels of phosphor, each pixel of phosphor being irradiated with electrons emitted from corresponding ones of the electron-emitting devices to generate light; and a driver for scanning the plurality of electron-emitting devices for emitting electron from the plurality of electron-emitting devices. The phosphor has luminescence center of allowed transition type material, and the driver scans the plurality of electron-emitting devices so that maximum of charge density dosed in one pixel phosphor, during one scanning period, is equal to or larger than 3×10?8 C/cm2.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: May 29, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daisuke Sasaguri, Yuji Kasanuki
  • Patent number: 8184224
    Abstract: Herein disclosed a display apparatus including: a pixel array having a matrix of pixel circuits each including respective electrooptical elements for determining a display brightness level and respective drive circuits for driving the electrooptical elements; wherein adjacent two of the pixel circuits are paired with each other, and each of the drive circuits of the adjacent two pixel circuits includes at least one transistor having a low-concentration source/drain region or an offset region of an offset gate structure, the electrooptical elements and the drive circuits of the adjacent two pixel circuits being laid out such that a line interconnecting a drain region and a source region of the at least one transistor extends parallel to a direction of pixel columns of the pixel circuits of the pixel array.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: May 22, 2012
    Assignee: Sony Corporation
    Inventors: Mitsuru Asano, Seiichiro Jinta, Masatsugu Tomida, Hiroshi Fujimura
  • Patent number: 8174189
    Abstract: A white Light Emitting Diode (LED) device that enables the adjustment of a Correlated Color temperature to realize emotional illumination is provided. The white LED device includes a package body for accommodating a plurality of light source units; a first light source unit accommodated in the package body, configured to have one or more first LED chips and a first phosphor, and configured to emit white light having a first Correlated Color Temperature (CCT); a second light source unit accommodated in the package body, configured to have one or more second LED chips and a second phosphor, and configured to emit white light having a second CCT; and a current control unit for varying current, to be supplied to at least one of the first and second LED chips, so as to adjust the first and second CCTs.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: May 8, 2012
    Assignee: Lumimicro Corp., Ltd.
    Inventors: Han Do Kim, Hyun Min Kim, Jung Hyun Yoon
  • Patent number: 8164268
    Abstract: A lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs), comprising at least said insulating type piezoelectric transformer connected to an LED module, a primary side of said insulating type piezoelectric transformer is used to receive a pulse voltage, and that is converted into an AC voltage in a piezoelectric voltage transformation way, and said AC voltage is output from a secondary side of said insulating type piezoelectric transformer to said LED module in proceeding with lighting function. Due to its various advantages of small leakage current, good insulation capability, high voltage endurance, low operation temperature, compact size, thin profile, high energy conversion efficiency, said insulating type piezoelectric transformer can be used to not only raise lighting efficiency, but also reduce overall size of said lighting device.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: April 24, 2012
    Assignees: Midas Wei Trading Co., Ltd., Champion Elite Company Limited
    Inventor: Tao-Chin Wei
  • Patent number: 8164545
    Abstract: An organic electroluminescence device which includes a power line formed on the same layer as source and drain electrodes of a thin film transistor (TFT) and formed on a substrate on which the TFT is formed, a first insulating layer formed on the TFT, a lower electrode that electrically connected to one of the source and drain electrodes of the TFT and disposed on the first insulating layer, a first auxiliary power line and a second auxiliary power line formed on the same layer as the lower electrode in the second insulating layer, a second insulating layer formed on an edge portion of the lower electrode and not formed on the second auxiliary power line, wherein an opening that exposes a portion of the lower electrode is formed, an organic film formed on a substrate; and an upper electrode formed on the substrate.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: April 24, 2012
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Won-Kyu Kwak
  • Patent number: 8159138
    Abstract: A LED driving topology includes a LED array and a current source connected in series between two power inputs receiving a positive voltage and a negative voltage respectively. This topology increases the voltage difference across the LED array and hence has the capability of lighting up more serially connected LEDs, without requiring an additional boost circuit or a high voltage. In addition, the circuit of the current source can be made by a low-voltage manufacturing process.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: April 17, 2012
    Assignee: Richtek Technology Corp.
    Inventors: Chun-Tsung Chen, Chun-Hsiung Chang, Tsan-Huei Wu, Shih-Hui Chen
  • Patent number: 8154475
    Abstract: The present invention relates to a plasma display device and a driving method thereof. The plasma display device includes a first switch, and a second switch. The first switch has a first end electrically connected to a first power source that supplies a first voltage and a second end electrically connected to the plurality of first electrodes, and gradually increases a voltage of the plurality of first electrodes during a reset period. The second switch has a first end electrically connected to a second power source that supplies a second voltage that is less than the first voltage and a second end electrically connected to the plurality of first electrodes. The first and second switches are simultaneously turned on in the reset period.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: April 10, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jin-Ho Yang
  • Patent number: 8144084
    Abstract: An electro-luminescent display includes a first array of light-emitting elements. Each of these light-emitting elements has an optical element. A second array of light-emitting elements also includes a second optical element different from the first. One or more row lines are electrically connected to either light-emitting elements in the first array of light-emitting elements or light-emitting elements in the second array of light-emitting elements. One or more column lines provide a data signal to the first and second array of light-emitting elements. A driver circuit delivers common information to the light-emitting elements in both the first and second arrays in response to a select signal for activating light-emitting elements in the first or second arrays.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: March 27, 2012
    Assignee: Global OLED Technology LLC
    Inventors: Michael E. Miller, Joseph R. Bietry, Ronald S. Cok
  • Patent number: 8144090
    Abstract: A driver circuit for driving source lines of an electro-optical device includes first and second source short-circuit circuits that respectively short-circuit first and second source lines and a source short-circuit node, a source charge storage short-circuit circuit that short-circuits a source charge storage node connected with one end of a source capacitor and the source short-circuit node, a voltage setting circuit that supplies a given voltage to the source charge storage node, and a node short-circuit circuit that short-circuits a common electrode voltage output node and the source short-circuit node, a voltage output to a common electrode of the electro-optical device provided opposite to a pixel electrode through an electro-optical element being applied to the common electrode voltage output node.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: March 27, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Haruo Kamijo, Motoaki Nishimura, Takeshi Nomura
  • Patent number: 8139052
    Abstract: An electro-optical device includes data lines divided into groups of M data lines, where N is a natural number equal to or greater than three. Output lines are arranged in correspondence with the data lines and receive, during a predetermined period, output of a correction voltage having a predetermined voltage level and sequential data voltages for defining gray scale levels of the pixels. A time division circuit simultaneously supplies the correction voltage output to the output line to M data lines of each group of data lines, where M is a natural number equal to or greater than two and equal to or less than “N?1”.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: March 20, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Akihiko Ito
  • Patent number: 8134304
    Abstract: A light source driving device for driving a light emitting component is disclosed. The light source driving device includes a voltage converter coupled to the light emitting component for converting an input voltage into an output driving voltage according to a voltage control signal, a dimming unit coupled to the light emitting component for implementing a dimming process according to a dimming signal, a current source coupled to the dimming unit for providing a driving current to drive the light emitting component, and a control unit coupled to the dimming unit and the voltage converter for detecting a dimming state to generate a dimming detection signal and generating a reference voltage according to the dimming detection signal, wherein the control unit controls the voltage converter to generate the output driving voltage so as to driving the light emitting component.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: March 13, 2012
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Kuo-Ching Hsu, Tsung-Hau Chang, Chin-Hsun Hsu
  • Patent number: 8125472
    Abstract: A display device responsive to a controller, including a substrate having a display area; a two-dimensional array of pixels formed on the substrate in the display area, each pixel comprising an optical element and a driving circuit for controlling the optical element in response to selected pixel information; a two-dimensional array of selection circuits located in the display area, each associated with one or more pixels, for selecting pixel information provided by the controller, wherein each selection circuit receives the provided pixel information, selects pixel information corresponding to its associated pixel(s) in response to the provided pixel information, and provides the selected pixel information to the corresponding driving circuit(s); and a parallel signal conductor electrically connecting the selection circuits in common for transmitting pixel information provided by the controller to each of the selection circuits.
    Type: Grant
    Filed: June 9, 2009
    Date of Patent: February 28, 2012
    Assignee: Global OLED Technology LLC
    Inventors: Ronald S. Cok, Christopher J. White
  • Patent number: 8125415
    Abstract: There is provided an active matrix EL display device that can display a clear multi gray-scale color display to reduce the shift in the potential caused by the potential drop due to the wiring resistance of a power source supply line, in order to decrease the unevenness in a display region. A plurality of drawing out ports of the power source supply line are arranged. Further, in the wiring resistance between the external input terminal and the pixel portion power source supply line, potential compensation is performed by supplying potential to the power source supply line by a feedback amplifier. Further, in addition to above structure, the power source supply line may be arranged in a matrix.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: February 28, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Jun Koyama, Hajime Kimura
  • Patent number: 8125161
    Abstract: The present invention relates to a light emitting device (LED) driving apparatus that constantly maintains the average current flowing onto a plurality of channels. The light emitting device (LED) driving apparatus includes: a LED light source unit in which at least one LED channel is connected in parallel; at least one current detector that is disposed on a low end of a LED channel of the LED light source unit to detect the current flowing onto respective LED channels; at least one channel current controller that generates control signal controlling the average current of the channels by comparing current detected from the channels with reference wave; and a switching element that controls the average current of the LED channels in a PWM scheme according to the control signals.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: February 28, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Hyo Young Kim, Sung Hun Oh, Jin Hwan Kim, Jong Rak Kim
  • Patent number: 8120551
    Abstract: An active-matrix display device that employs current-programmed-type pixel circuits and performs the writing data to each of pixels on a line-by-line basis. The active-matrix display device has a matrix of current-programmed-type pixel circuits includes a data line driving circuit formed of a plurality of current driving circuits (CD) arranged so as to correspond to respective data lines. The data line driving circuit (CD) holds image data (luminance data herein) in the form of voltage, and then converts the voltage of the image data into a current signal. The current signal is then fed to the data lines at a time. The image information is thus written on the pixel circuits.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: February 21, 2012
    Assignee: Sony Corporation
    Inventor: Akira Yumoto
  • Patent number: 8120601
    Abstract: A display drive apparatus for driving a display pixel including a light-emitting element and a drive element in which one end of a current path is connected to the light-emitting element. The display drive apparatus has a specific value detection section detecting a difference value between a measured voltage detected at one end of a data line when a reference current is applied via the data line and a standard voltage corresponding to the reference current so as to obtain a specific value corresponding to variation of an element characteristic of the drive element, and a gradation signal correction section generating a corrected gradation signal by correcting a gradation signal according to display data based on the specific value so as to apply the corrected gradation signal from the one end of the data line to the display pixel.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: February 21, 2012
    Assignee: Casio Computer Co., Ltd.
    Inventors: Tomoyuki Shirasaki, Jun Ogura, Satoru Shimoda
  • Patent number: 8120550
    Abstract: The present invention relates to a display device that employs edge emitters as a source for pixel electrons. The edge emitters allow the viewing glass plate to be made very small or eliminated, thereby substantially reducing the size of or eliminating the spacers typically utilized in conventional display devices and thereby enabling a simple and compact assembly structure. In one embodiment a pixel configuration comprises a phosphor area disposed between a plurality edge emitters, each of which are associated with tynes that are adapted to reduce the distance between the emitters and that separate the phosphor area into segments such that the emitters emit electrons when the voltage between a phosphor segment and the an emitter exceed a threshold voltage to cause the phosphor segment to emit light.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: February 21, 2012
    Assignee: Copytele, Inc.
    Inventors: Frank J. DiSanto, Denis A. Krusos
  • Patent number: 8120287
    Abstract: A LED display system includes multiple LEDs, a power converter to produce a supply voltage for the LEDs, and multiple drivers to drive the LEDs. According to the maximum one of the forward voltages of the LEDs, the drivers provides a feedback signal for the supply voltage control, and the feedback signal is amplified or digitized to reduce the voltage drop in the global power line.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: February 21, 2012
    Assignee: Richtek Technology Corp.
    Inventors: Shui-Mu Lin, Ti-Ti Liu, Huan-Chien Yang
  • Patent number: 8120267
    Abstract: A LED driving circuit includes a bridge rectifier, a high-bias-voltage diode, a balancing capacitor, a driving chip, and a switch. The bridge rectifier receives external AC power and outputs a full-wave or half-wave AC power. One terminal of the high-bias-voltage diode and one terminal of the balancing capacitor are electrically coupled to a balancing node. The other terminals of the high-bias-voltage diode and the balancing capacitor are electrically coupled to the bridge rectifier and grounded respectively. The driving chip receives operating power from the balancing node, and outputs driving signals to operate the switch, so as to drive an LED. Through the arrangement of the forward bias voltage direction of the high-bias-voltage diode, the balancing capacitor is only discharged to the driving chip. Therefore, the capacitance value and the volume of the balancing capacitor, the space occupied by the driving circuit, and the cost of the driving circuit are reduced.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: February 21, 2012
    Assignee: Getac Technology Corporation
    Inventor: Ta Sung Hsiung
  • Patent number: 8120257
    Abstract: An organic electroluminescence lighting device includes a planar organic electroluminescence element; a planer heat diffusion plate provided on one surface of the organic electroluminescence element; and a constant current circuit element that is placed so as to contact the heat diffusion plate and supplies a constant current to the organic electroluminescence element.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: February 21, 2012
    Assignee: Rohm Co., Ltd.
    Inventor: Makoto Takamura
  • Patent number: 8120557
    Abstract: The present invention is to provide a light emitting device capable of obtaining a certain luminance without influence by the temperature change, and a driving method thereof. A current mirror circuit formed by using a transistor is provided for each pixel. The first transistor and the second transistor of the current mirror circuit are connected such that the drain currents thereof are maintained at proportional values regardless of the load resistance value. Thereby, a light emitting device capable of controlling the OLED driving current and the luminance of the OLED by controlling the drain current of the first transistor at a value corresponding to a video signal in a driving circuit, and supplying the drain current of the second transistor to the OLED, is provided.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: February 21, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Jun Koyama
  • Patent number: 8120280
    Abstract: A driving circuit for controlling a light source includes a frequency controller and a switch module. The frequency controller is operable for receiving a first dimming signal for controlling the light source to achieve a predetermined brightness, and for generating a second dimming signal having a frequency out of one or more predetermined ranges according to the first dimming signal when the frequency of the first dimming signal is within the predetermined ranges. The switch module coupled to the frequency controller is operable for switching on and off alternately to achieve the predetermined brightness of the light source according to the second dimming signal when the frequency of the first dimming signal is within the predetermined ranges and according to the first dimming signal when the frequency of the first dimming signal is out of the predetermined ranges.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: February 21, 2012
    Assignee: O2 Micro, Inc
    Inventors: Xinmin Yi, Ching-Chuan Kuo, Jianping Wang, Feng Shi
  • Patent number: 8115758
    Abstract: Power consumption required for charging and discharging a source signal line is reduced in an active matrix EL display device. A bipolar transistor (Bi1) has a base terminal B connected to an output terminal c1 of an operational amplifier (OP1), a collector terminal C connected to a low power potential (GND), and an emitter terminal E connected to a resistor R2. A high power potential (VBH) is a potential in synchronization with a high power potential of a light emitting element. A potential of the output terminal c1 of the operational amplifier (OP1) is outputted as a buffer low power potential (VBL). The low power potential (VBL) corresponds to a potential difference between the high power potential (VBH) and a high power potential (V1). Accordingly, the low power potential (VBL) can follow the high power potential (VBH), that is a high power potential of the light emitting element.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: February 14, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tomoyuki Iwabuchi, Hiroyuki Miyake
  • Publication number: 20120032602
    Abstract: A method for driving a plasma display panel in which a plurality of first and second electrodes are arranged adjacently each other, a plurality of third electrodes are arranged to cross the first and second electrodes, the plasma display panel having a reset period, an address period, and a sustain discharge period is provided. The method includes in the reset period, applying to the second electrodes a first waveform voltage, whose applied potential increases with time, then applying to the second electrodes a second waveform voltage, whose applied potential decreases with time.
    Type: Application
    Filed: August 8, 2011
    Publication date: February 9, 2012
    Inventors: Noriaki Setoguchi, Shigeharu Asao, Yoshikazu Kanazawa
  • Patent number: 8102126
    Abstract: To provide a light emitting device without nonuniformity of luminance, a correcting circuit for correcting a video signal supplied to each pixel to a light emitting device. The correcting circuit is stored with data of a dispersion of a characteristic of a driving TFT among pixels and data of a change over time of luminance of a light emitting element. Further, by correcting a video signal inputted to the light emitting device in conformity with a characteristic of the driving TFT of each pixel and a degree of a deterioration of the light emitting element based on the over-described two data, nonuniformity of luminance caused by a deterioration of an electroluminescent layer and nonuniformity of luminance caused by dispersion of a characteristic of the driving TFT are restrained.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: January 24, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Hajime Kimura, Mai Akiba, Aya Anzai, Yu Yamazaki
  • Patent number: 8102347
    Abstract: The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: January 24, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yasunori Yoshida, Hajime Kimura, Shinji Maekawa, Osamu Nakamura, Shunpei Yamazaki
  • Patent number: 8089428
    Abstract: In an image display apparatus using an FED or an organic EL element, image display that is high in illumination uniformity and high in image quality can be performed. A display element with a matrix structure which conducts linear sequential driving which determines the luminance by a current is used, a threshold voltage of a cathode line immediately before one select period has been terminated where a control electrode line is sequentially driven is measured by a threshold voltage measuring section, the measured threshold voltage is recorded for each of the pixels, and a driving signal at the time of selecting the pixel is corrected by using the value of the recorded threshold voltage, to thereby control electric charge that is emitted from a cathode.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: January 3, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Tomio Yaguchi, Kiyoshige Kinugawa, Shigeyuki Nishitani, Takahiko Muneyoshi, Susumu Sasaki, Shoichi Uchino, Akiko Iwata, Makoto Okai, Tetsuya Yamazaki, Nobuaki Hayashi
  • Patent number: 8089429
    Abstract: A drive section sequentially supplies respective scanning lines with a control signal and supplies respective signal lines with a video signal to carry out a correction operation for holding a voltage equivalent to a threshold voltage of a drive transistor in a holding capacitance, and subsequently performs a write operation for writing the video signal in the holding capacitance, and before the correction operation, the drive section switches potentials at the bias line and adds a coupling voltage to one current terminal of the drive transistor via an auxiliary capacitance to carry out a preparation operation for an initialization to set a potential difference between a control terminal and the one current terminal of the drive transistor larger than the threshold voltage.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: January 3, 2012
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8084950
    Abstract: Provided is a drive circuit for a light emitting device, which compensates for a decrease in luminance of the light emitting device and reduces a burn-in phenomenon. The drive circuit includes: a first capacitor connected to a gate of a drive transistor; and a second capacitor formed between the first capacitor on a side to which the gate of the drive transistor is not connected, and one end of a light emitting device. The drive circuit corrects an amount of charge of the first capacitor according to a change in potential of the node when the light emitting device starts illumination, and then, causes the light emitting device to illuminate according to the corrected amount of charge.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: December 27, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventor: Somei Kawasaki
  • Patent number: 8085226
    Abstract: A semiconductor device with a transistor for supplying a current to a pixel comprising an EL element, that can supply an accurate current without the influence of variations even when a small signal current, is provided. A precharge voltage is supplied in advance for the current supply to a pixel and subsequently, the signal writing is completed quickly. The precharge voltage is outputted from a circuit for supplying voltage and current that supplies a current to a current source circuit for supplying a current to the pixel. As the precharge voltage, a gate voltage of a transistor for supplying a current to the current source circuit is supplied to the pixel. Optimum precharge voltage can be supplied in the case where W/L of a transistor in the pixel and W/L of a transistor for supplying current in the circuit for supplying voltage and current are approximately equivalent to each other.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: December 27, 2011
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Hajime Kimura
  • Patent number: 8085221
    Abstract: A method drives a panel and a plasma display unit, wherein one field includes a plurality of subfields, each having an addressing period for producing an address discharge selectively in the discharge cells, and a sustaining period for producing a sustain discharge by applying a number of sustaining pulses corresponding to a weight of brightness in a discharge cell where the address discharge has been produced. Additionally, a sustaining pulse generator circuit includes a power recovery section for controlling the rising or the falling of the sustaining pulse by producing resonance between an inter-electrode capacitance of a display electrode pair and an inductor, and a clamping section for clamping a voltage of the sustaining pulse at a predetermined potential, wherein the power recovery section is used to set twice a time of the rising of the sustaining pulse to be equal to or longer than a duration of the sustaining pulse.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: December 27, 2011
    Assignee: Panasonic Corporation
    Inventors: Yutaka Yoshihama, Shigeo Kigo, Kazuyoshi Nakamura, Kenji Sasaki, Fumito Kusama
  • Patent number: RE43083
    Abstract: A gas discharge panel includes a first substrate and a second substrate. A plurality of display electrode pairs which are each made up of a sustain electrode and a scan electrode are formed on the first substrate, and the first substrate and the second substrate are set facing each other with a plurality of barrier ribs in between so as to form a plurality of cells. In this gas discharge panel, at least one of the sustain electrode and the scan electrode includes: a plurality of line parts; and a discharge developing part which makes a gap between adjacent line parts smaller in areas corresponding to channels between adjacent barrier ribs than in areas corresponding to the barrier ribs.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: January 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Masaki Nishimura, Hidetaka Higashino, Ryuichi Murai, Yusuke Takata, Nobuaki Nagao, Toru Ando, Naoki Kosugi, Hiroyuki Tachibana
  • Patent number: RE43267
    Abstract: When performing the line-sequential addressing for setting the state of each of the cells arranged in rows and columns that constitute a display screen, discharge is generated that has intensity in accordance with display data corresponding to each of all cells belonging to the selected row for each selection of the row. Thus, the priming effect in the following discharge is generated.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE43268
    Abstract: When performing the line-sequential addressing for setting the state of each of the cells arranged in rows and columns that constitute a display screen, discharge is generated that has intensity in accordance with display data corresponding to each of all cells belonging to the selected row for each selection of the row. Thus, the priming effect in the following discharge is generated.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE43269
    Abstract: When performing the line-sequential addressing for setting the state of each of the cells arranged in rows and columns that constitute a display screen, discharge is generated that has intensity in accordance with display data corresponding to each of all cells belonging to the selected row for each selection of the row. Thus, the priming effect in the following discharge is generated.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE43354
    Abstract: A driving circuit for an electro-luminescence (EL) cell includes an EL cell, and a supply circuit selectively applying current to the EL cell based on a pixel signal from a data line. A control circuit controls current flow from the supplying circuit to the EL cell such that an amount of current for discriminating between gray scale levels is approximately tens of micro-amps.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: May 8, 2012
    Assignee: LG Display Co., Ltd.
    Inventor: Sung Joon Bae