Diverse-type Energizing Or Bias Supplies To Different Electrodes Patents (Class 315/169.1)
  • Patent number: 7863823
    Abstract: A method of improving uniformity of brightness between pixels in an electron emission panel includes respectively applying a scan driving voltage and a data driving voltage to a scan electrode and a data electrode of each of a plurality of pixels, wherein one of the scan driving voltage and the data driving voltage is higher than the other; measuring a brightness of each of the pixels; and respectively applying a scan adjustment voltage and a data adjustment voltage to the scan electrode and the data electrode of each of the pixels based on the measured brightness of a respective one of the pixels, wherein a higher one of the scan adjustment voltage and the data adjustment voltage is applied to a same one of the scan electrode and the data electrode to which a lower one of the scan driving voltage and the data driving voltage is applied.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: January 4, 2011
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Ji-Hong Lim
  • Patent number: 7864141
    Abstract: A display device and a driving method thereof are provided. The display device comprises a plurality of pixels, each pixel includes: a light emitting element; a storage capacitor; a driving transistor that has a control terminal, an input terminal, and an output terminal and supplies a current to the light emitting element to emit light; a first switching transistor for supplying a data voltage to the storage capacitor in response to a scanning signal; a second switching transistor for diode-connecting the driving transistor in response to a previous scanning signal; and a third switching transistor for supplying a driving voltage to the driving transistor in response to an emission signal, wherein the storage capacitor stores a control voltage depending on a threshold voltage of the driving transistor and a threshold voltage of the light emitting element through the diode-connected driving transistor, and transmits the control voltage and the data voltage to the control terminal of the driving transistor.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: January 4, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Joon-Chul Goh
  • Patent number: 7863824
    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: November 18, 2008
    Date of Patent: January 4, 2011
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Hajime Kimura, Mai Akiba, Aya Anzai, Yu Yamazaki
  • Patent number: 7855500
    Abstract: An electron emission display that can mitigate or prevent problems of an arc discharge and a wire disconnection due to increases in resistance at portions where a sealing member contacts electrodes includes: an electron emission device on which upper surfaces of electrodes are exposed, a front panel that is disposed in front of the electron emission device, the front panel being of a phosphor material, and a sealing member that seals a space formed by the electron emission device and the front panel by being disposed on the edges of the space in contact with the electrodes. The electrodes are formed on an entire surface of the electron emission device with a narrow width at an end portion of the electron emission device where the electrodes are connected to an external power source, and the sealing member contacts the electrodes closer to the space than end portions of the electrodes where the width of the electrodes is narrowed.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: December 21, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jae-Sang Ha
  • Patent number: 7852290
    Abstract: A plasma display apparatus is disclosed. The plasma display apparatus includes a plasma display panel including first, second and third electrodes and a sustain driver. The sustain driver supplies a sustain signal swinging between a positive sustain voltage and a negative sustain voltage to the first electrode. The sustain driver supplies a voltage gradually falling from the positive sustain voltage or a voltage gradually rising from the negative sustain voltage to the first electrode during a second period following a first period when the positive sustain voltage or the negative sustain voltage is supplied. The sustain driver includes an inductor into which a current flows in the same direction during the first period and the second period.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: December 14, 2010
    Assignee: LG Electronics Inc.
    Inventor: Janghwan Cho
  • Publication number: 20100289840
    Abstract: A light emitting device which is able to suppress power consumption while a balance of white light is maintained is provided. According to the present invention, either the potential level of the Hi video signal or Lo video signal which is given to a gate electrode of a transistor, and the potential level of the power source lines are changed by the respective corresponding colors. Concretely, the potential level at the side of Lo and the potential level of the power source line are made to be changed by the respective corresponding colors when a transistor which controls current supplied to a light emitting element is a p-channel type. Conversely, the potential level at the side so of the Hi and potential level of the power source line are made to be changed by the respective corresponding colors when a transistor which controls current supplied to a light emitting element is an n-channel type.
    Type: Application
    Filed: July 27, 2010
    Publication date: November 18, 2010
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Mitsuaki Osame, Yu Yamazaki
  • Patent number: 7834556
    Abstract: A driving method for an organic electroluminescence light emitting section using a driving circuit, the driving circuit includes a driving transistor, an image signal writing transistor, a light emission control transistor, and a capacitor section. The driving method includes the steps of: carrying out a preprocess of applying a first node initialization voltage and applying a second node initialization voltage; carrying out a threshold voltage cancellation process; placing the light emission control transistor into an on state, a writing process of applying an image signal; and placing the image signal writing transistor into an off state so that current is supplied to the organic electroluminescence light emitting section to drive the organic electroluminescence light emitting section.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: November 16, 2010
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 7834823
    Abstract: A display apparatus, comprising a pixel array section and a drive section that drives the pixel array section, wherein the pixel array section includes first scanning lines and second scanning lines arranged in rows, signals lines arranged in columns, pixels that are provided where the first scanning lines, the second scanning lines, and the signal lines meet and that are arranged in rows and columns, a power line that supplies power to each of the pixels, and an earth line. The drive section includes a first scanner that sequentially line scans the pixels in rows by sequentially supplying a first control signal to each of the first scanning lines, a second scanner that sequentially supplies a second control signal to each of the second scanning lines in conjunction with the sequential line scanning, and a signal selector that supplies a video signal to the columns of signal lines in conjunction with the sequential line scanning.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: November 16, 2010
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Naobumi Toyomura, Hideo Kataoka
  • Patent number: 7830341
    Abstract: An organic electroluminescence (EL) display device wherein pixel defects are reduced with a minimum increase in the number of thin film transistors used is to be provided.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: November 9, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hiroshi Oooka, Hirotsugu Sakamoto, Masamitsu Furuie, Takeshi Ookawara
  • Patent number: 7825879
    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: July 26, 2007
    Date of Patent: November 2, 2010
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Takao Tanikame, Katsuhide Uchino
  • Patent number: 7825613
    Abstract: A backlight assembly includes a plurality of unit blocks to emit light. Each unit block includes a light-emitting part and a driving part. The light-emitting part includes at least two red light-emitting diodes (LEDs), two green LEDs, and two blue LEDs. The driving part includes a red LED-driving element that provides the red LEDs with a driving voltage, a green LED-driving element that provides the green LEDs with a driving voltage, and a blue LED-driving element that provides the blue LEDs with a driving voltage. LEDs may be driven together in a group, or may be driven individually to sequentially emit red light, green light, and blue light so a color filter is not included in a display panel having the backlight assembly. A driving element is connected to the LEDs to reduce manufacturing costs for the driving element circuits, thereby reducing manufacturing costs of the backlight assembly.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: November 2, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Byoung-Dae Ye, Sang-Hoon Lee, Ho-Sik Shin
  • Patent number: 7816852
    Abstract: An electron emission display includes first and second substrates facing each other to form a vacuum envelope, an electron emission unit formed on the first substrate, and a light emission unit formed on the second substrate. The light emission unit includes an anode electrode formed on the second substrate and electrically connected to at least one anode terminal to receive an anode voltage from the anode terminal, and the anode terminal is arranged on a side of the first substrate external to the vacuum envelope and in parallel to the first substrate.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: October 19, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Dong-Su Chang, Hyeong-Rae Seon
  • Patent number: 7817113
    Abstract: A method for driving a plasma display panel having at least first electrodes and second electrodes which cause discharge in cells is provided. The method includes applying a first pulse and a second pulse to the second electrode in an address preparation period. The method also includes applying a scan pulse to the second pulse to the second electrode in an address period. The method includes the first pulse having a voltage changing with time in a positive direction and the second pulse having a voltage changing with time in a negative direction and the scan pulse having a negative voltage which is lower than the attained voltage of the second pulse.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: October 19, 2010
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: 7812798
    Abstract: An OLED display device includes a current source and an OLED equivalent module. The current source includes a first controller, two biased sources, and two PMOS transistors. The current source outputs current to the OLED equivalent module to enable the OLED equivalent module emitting light.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: October 12, 2010
    Assignee: Princeton Technology Corporation
    Inventor: Chi-Chang Chen
  • Patent number: 7808461
    Abstract: An image display apparatus according to the present invention includes: n of scanning lines, n being an integer of 3 or greater; a scanning circuit that outputs a selection signal for sequentially selecting scanning lines from the n of scanning lines in each transitional selection period, light being to be emitted onto the selected scanning lines; a plurality of display devices that are to form a plurality of pixels that form the plurality of scanning lines; an evaluation circuit that outputs an evaluation value corresponding to the brightness of an image formed by the pixels of each of the plurality of display devices; and a control circuit that changes scanning conditions in the scanning circuit in accordance with the evaluation value, so that the ratio of the total time in term of a unit time of the time when each of the n of scanning lines being selected during the selection periods to the unit time is changed.
    Type: Grant
    Filed: February 17, 2005
    Date of Patent: October 5, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tatsuro Yamazaki, Naoto Abe
  • Patent number: 7800306
    Abstract: A plasma display panel is provided. The plasma display panel has an electrode structure in which a second gap formed between electrode pairs in a discharge cell at a corner region of the panel is smaller than a gap formed between electrode pairs in a discharge cell at a more peripheral region of the panel. The plasma display panel may improve discharge capabilities, particularly in the more peripheral region of the panel, when a foreign substance is present on surfaces of the electrodes.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: September 21, 2010
    Assignee: LG Electronics Inc.
    Inventor: Jaeyoung Oh
  • Patent number: 7796100
    Abstract: An organic electroluminescence display transmits a data driving voltage to a data driving unit to make different a voltage of the data signal outputted from the data driving unit, the data driving voltage being in a different level in every subframe according to the digital data signal, and displaying a desired grey level of an image by allowing a desired subframe to emit light according to the number of bits of the data signal, and a driving method thereof. An organic electroluminescence display includes a plurality of scan lines to transmit a scan signal; a plurality of data lines to transmit a digital data signal; and a plurality of pixels defined by a plurality of power supply lines to supply power, wherein the scan signal is transmitted to a plurality of subframes, and ON signals of the digital data signal have different voltages in a plurality of the subframes.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: September 14, 2010
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Hong Kwon Kim
  • Patent number: 7796102
    Abstract: The display device of the invention comprises a plurality of scanning lines (Wscan and Escan) which are selected successively, a plurality of data lines (Data) to which the writing electric current (Idata) in accordance with brightness information is supplied according to the scanning line selection, and a plurality of pixels (PX) arranged at intersecting points between the scanning lines and the data lines. Each of the pixels comprises a light emitting element (OLED), a driving transistor (TFT4), a capacitor (C) connected to the gate (Nd) of the driving transistor for accumulating writing data, a first transistor (TFT1) which is turned on during writing period in which the scanning lines are scanned and which connects the data lines and the drain of the driving transistor, and a second transistor (TFT2) which is turned on during the writing period and which short-circuits the gate and drain of the driving transistor.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: September 14, 2010
    Assignee: FUJIFILM Corporation
    Inventors: Atsuo Ishizuka, Hisashi Yamaguchi, Yasunobu Hashimoto
  • Patent number: 7791264
    Abstract: An electron emission apparatus can effectively suppress the adverse effect of electric discharges that can take place between the oppositely disposed electrodes of the apparatus to which a high voltage is applied by dividing the electrode adapted to have a higher electric potential into segments in order to reduce the electrostatic capacitance between the electrodes. In the case of an electron emission apparatus comprising electron-emitting devices, said plurality of electron-emitting devices are disposed such that the direction along which those that can be driven simultaneously are arranged is not parallel with the direction along which the electrode is divided into the electrode segments in order to reduce the variable range of the electric current that can flow in the segments.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: September 7, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshitami Hara, Kazuya Miyazaki, Akihiko Yamano
  • Patent number: 7786957
    Abstract: A plasma display device which generates reset discharge in a reset period prior to an address period in the beginning subfields of a one-field display period, and applies two sustain pulses, which have rising timings different from each other by a predetermined period of time and have partly overlapping application periods, to row electrodes forming each row electrode pair after ending a sustain period in a last subfield of the one-field display period to thereby cause erasure discharge in discharge cells where sustain discharge has been caused in the last subfield.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: August 31, 2010
    Assignee: Panasonic Corporation
    Inventor: Kazuaki Sakata
  • Patent number: 7786988
    Abstract: Described herein are systems and methods that reduce power consumption for an electronics device that includes a display device. The systems and methods identify characteristic window video information for a window that allows a person to visually locate the window in a display area for the display device. Video information in the display area other than the characteristic window video information is altered to conserve power. Preserving the characteristic window video information for the window maintains a person's ability to see and locate the window at a later time, even though other portions of the display area have been altered and potentially visually degraded to conserver power.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: August 31, 2010
    Assignee: Honeywood Technologies, LLC
    Inventor: William J. Plut
  • Patent number: 7777420
    Abstract: An electron emission device includes a first substrate, a second substrate facing the first substrate, a scan electrode formed on the first substrate and having a width Sv, and a data electrode formed on the first substrate perpendicular to and crossing the scan electrode at a crossed region. A unit pixel is disposed in an area of the crossed region and has a pitch Pv. An insulating layer is disposed between the scan electrodes and the data electrodes. An electron emission region is electrically coupled the scan electrode or the data electrode, and the scan electrode and the unit pixel satisfy the following condition: 0.5?Sv/Pv?0.95.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: August 17, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Sang-Ho Jeon, Byong-Gon Lee, Sang-Jo Lee
  • Patent number: 7768216
    Abstract: A control circuit for controlling light emitting diodes comprises a switch for turning on or off a string of light emitting diodes. A combiner generates a control signal from a data signal and a noise signal. A sigma delta modulator receives the control signal and a clock signal with a clock period and generates a switching signal for controlling the switch.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: August 3, 2010
    Assignee: Austriamicrosystems AG
    Inventor: Manfred Pauritsch
  • Patent number: 7768477
    Abstract: In a plasma display apparatus and a method of driving the same which is driven by a driving signal having a reset period, an address period and a sustain period, a sustain pulse is applied during the sustain period, the sustain pulse including: an interval in which the sustain pulse rises from a ground voltage to a first voltage; an interval in which the first voltage is substantially constant for predetermined period of time; an interval in which the sustain pulse rises from the first voltage to a second voltage; and an interval in which the second voltage is substantially constant for a predetermined period of time. At least two discharges can be generated per a single sustain pulse by applying a sustain pulse rising and falling in two stages during one sustain period, and discharge efficiency and luminance can be improved by lengthening a light emission time by maintaining the light generated by a discharge for a predetermined time.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: August 3, 2010
    Assignee: LG Electronics Inc.
    Inventors: Yun Kwon Jung, Gun Su Kim
  • Patent number: 7764281
    Abstract: An addressing mechanism for charging and discharging quasi-capacitive elements in an X-Y matrix. The addressing mechanism may be configured to toggle a resistor-capacitor (RC) time constant between large and small values such as by opening or closing a circuit path to a low impedance resistor disposed in parallel with a higher impedance in-line resistor. When this occurs, elements in the X-Y matrix can be addressed and controlled. The X-Y matrix may be comprised of multiple “rows” and “columns” of conductors where crosstalk may occur along the columns and rows. Crosstalk may be curtailed by using either hysteresis management or global control of the row's impedance along its entire length. The resulting control obviates the need for active devices at each matrix element to perform the switching functions.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: July 27, 2010
    Assignee: Rambus International Ltd.
    Inventor: Kevin Derichs
  • Patent number: 7764251
    Abstract: A display apparatus includes: a pixel array section including a row of scanning lines, a column of signal lines, and pixels in a matrix, with each of the pixels disposed at an intersection of both of the lines; and a drive section. The drive section performs line progressive scanning on the pixels. The pixel includes a light emitting device, a sampling transistor, a driving transistor, a switching transistor, and a holding capacitor. The sampling transistor samples a video signal in the holding capacitor, the driving transistor changes the device to a luminous state, the switching transistor becomes ON in advance of the sampling of the video signal to change the light emitting device to a non-luminous state, and the sampling transistor takes in the OFF voltage from the signal line to the driving transistor, thereby preventing a penetration current from flowing from the power source toward the fixed potential.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: July 27, 2010
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 7760166
    Abstract: A display apparatus, comprising a pixel array section and a drive section that drives the pixel array section, wherein the pixel array section includes first scanning lines and second scanning lines arranged in rows, signals lines arranged in columns, matrix pixels that are provided where the first scanning lines, the second scanning lines, and the signal lines cross, and a power line that supplies power to each of the pixels, and an earth line. The drive section includes a first scanner that sequentially line scans the pixels in rows by sequentially supplying a first control signal to each of the first scanning lines, a second scanner that sequentially supplies a second control signal to each of the second scanning lines in conjunction with the sequential line scanning, and a signal selector that supplies video signals to the columns of signal lines in conjunction with the sequential line scanning.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: July 20, 2010
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Naobumi Toyomura
  • Patent number: 7760167
    Abstract: A display apparatus includes a pixel array section and a drive section that drives the pixel array section. The pixel array section includes first scanning lines and second scanning lines arranged in rows, signals lines arranged in columns, matrix pixels that are provided at a position where the first scanning lines, the second scanning lines, and the signal lines cross, a power line that supplies power to each of the pixels, and an earth line. The drive section includes a first scanner that sequentially line scans the pixels per each row by sequentially supplying a first control signal to each of the first scanning lines, a second scanner that sequentially supplies a second control signal to each of the second scanning lines in conjunction with the sequential line scanning, and a signal selector that supplies video signals to the columns of signal lines in conjunction with the sequential line scanning.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: July 20, 2010
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Tetsuo Minami
  • Patent number: 7760159
    Abstract: The present invention relates to an apparatus and method for driving a plasma display panel, and more particularly, to a scan drive apparatus and method of a plasma display panel. The present invention includes a data conversion unit converting video data to converted video data suitable for the PDP, a subfield mapping unit mapping a subfield corresponding to the converted video data, a data comparison unit computing a size of a displacement current by comparing video data of a cell bundle including at least one cell situated on a specific scan line to video data of a cell bundle situated in vertical and horizontal directions of the cell bundle according to each scan type of a plurality of scan types, and a scan sequence decision unit deciding a scan sequence according to the scan type having a small displacement current inputted from the data comparison unit.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: July 20, 2010
    Assignee: LG Electronics Inc.
    Inventors: Takuya Watanabe, Seong Ho Kang, Sang Jin Yoon, Soo Seok Sim
  • Patent number: 7755580
    Abstract: A method for regulating the biasing voltage of column control circuits of an array screen formed of LEDs distributed in lines and columns, the column control circuits being adapted to turning on at least one LED of a line. The method includes increasing the biasing voltage when the current flowing through at least one activated LED is smaller than a determined luminance current and of decreasing the biasing voltage when the current flowing through each activated LED is equal to the determined luminance current.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: July 13, 2010
    Assignee: STMicroelectronics S.A.
    Inventors: Céline Mas, Eric Benoit, Olivier Scouarnec, Olivier Le Briz, Danika Chaussy, Philippe Maige
  • Patent number: 7742020
    Abstract: A signal line driving circuit which includes a digital signal sampling circuit, a storage circuit, a time setting circuit and a constant current circuit, is fabricated of TFTs on an insulating substrate which is made of the same substance as that of a pixel portion substrate. Thus, in a passive type EL display device, the problem of a distortion in the case of bonding the signal line driving circuit onto the pixel portion substrate can be eliminated. Besides, in an active type EL display device, each pixel is constructed of one transistor and an EL element. Thus, the aperture factor of the EL display device is enlarged.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: June 22, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Jun Koyama
  • Patent number: 7742022
    Abstract: There is disclosed an organic EL display device using pre-charge which can improve display quality by preventing a cross talk generated by a brightness difference within the same picture realization area, and a driving method thereof. An organic EL display device according to an embodiment of the present invention includes a display panel where a plurality of data lines cross a plurality of scan lines and electro luminescence cells are arranged in the crossing parts thereof; a pre-charge driver for supplying a pre-charge current to the data line in accordance with gray levels of data; and a data driver for charging a data current to the data line for a designated period which is set before a scan pulse is supplied to the electro luminescence cell and after the pre-charge current is supplied.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: June 22, 2010
    Assignee: LG Electronics Inc.
    Inventors: Hak Su Kim, Jae Do Lee
  • Patent number: 7733315
    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: December 2, 2005
    Date of Patent: June 8, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yasunori Yoshida, Hajime Kimura, Shinji Maekawa, Osamu Nakamura, Shunpei Yamazaki
  • Patent number: 7728828
    Abstract: A unit circuit includes a capacitive element having a first electrode, a second electrode, and a dielectric layer interposed between the first electrode and the second electrode, a transistor having a gate electrode connected to the first electrode, a first terminal supplied with one of a low potential and a high potential, a second terminal connected to a driven element, a first switching element controlling electrical connection between the gate electrode of the transistor and the second terminal, and a second switching element connected to the second electrode. A potential of the first electrode is set to a predetermined potential higher than a first potential, and the potential of the first electrode is set to the first potential in a state that the first electrode is electrically isolated from the predetermined potential by turning off the first switching element.
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: June 1, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Takashi Miyazawa
  • Patent number: 7727039
    Abstract: A method of aging a field emission device including a cathode and an anode arranged parallel to each other, an emitter arranged on the cathode to emit electrons to the anode, and a gate electrode arranged on the cathode adjacent to the emitter, the method including: supplying a voltage to the cathode; supplying a voltage to the gate; and then supplying a sufficiently low voltage to the anode so as to prevent a short-circuited portion between the cathode and the gate electrode from being permanently damaged due to an overcurrent.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: June 1, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chan-wook Baik, Sun-il Kim, Deuk-seok Chung, Byong-gwon Song, Min-jong Bae
  • Patent number: 7728510
    Abstract: Provided are an organic light emitting display (OLED) and a method of fabricating the same capable of improving product reliability by forming an auxiliary electrode line to be in contact with a second electrode power supply line to remove an organic layer on the auxiliary electrode line and minimize the organic layer on a pixel region, thereby preventing pixel shrinkage resulting from degradation of an organic emission layer caused by out-gassing from the organic layer.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: June 1, 2010
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Sang-Hun Oh
  • Patent number: 7724213
    Abstract: A plasma display device is provided which can stabilize discharge and improve display quality. In the plasma display device, a rear edge part of a sustain pulse to be applied at the end of a sustain period of each of the subfields is formed of a first section in which a voltage value slowly changes from a peak voltage value of the sustain pulse to a predetermined first voltage value, a second section in which the first voltage value is maintained for a predetermined period, and a third section in which the voltage value slowly changes from the first voltage value to a second voltage value having polarity different from that of the first voltage value.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: May 25, 2010
    Assignee: Panasonic Corporation
    Inventors: Motofumi Ikeda, Kazuaki Sakata, Masatsugu Onizuka
  • Patent number: 7724220
    Abstract: The invention relates to an LED current driving system. The LED current driving system comprises an LED driver. The LED driver comprises at least one LED driving unit for outputting a driving current to an LED. Each LED driving unit comprises a plurality of current sources and a plurality of switches. The switches are connected to the corresponding current source. Each switch controls the ON/OFF state of the corresponding current source in accordance with the duty cycle control signal and a current control signal. Therefore, by integrating the LED driver on the LCOS panel, the LED current driving system of the invention can decrease the pin number of the LCOS chip, the overall area and the system cost so as to improve the yield of the LED current driving system. Besides, the LED current driving system utilizes the current sources to form the driving current to stably and precisely control the driving current flowing through the corresponding LED so that the color quality of the image can be improved.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: May 25, 2010
    Assignee: Himax Display, Inc.
    Inventors: Cheng-Chi Yen, Yung-Yuan Ho, Yen-Chen Chen
  • Patent number: 7719498
    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: February 4, 2008
    Date of Patent: May 18, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Jun Koyama
  • Patent number: 7719486
    Abstract: A voice circuit is arranged on a chassis member. The voice circuit comprises a voice output amplifier and a high-frequency bypass unit. An output terminal of the voice output amplifier is connected to one end of a voice coil in a speaker through an interconnection, and is grounded through a high-frequency bypass unit. The voice output amplifier supplies a voice current to the voice coil through an interconnection. The resonance frequency of the high-frequency bypass unit is set to the same frequency as that of a discharge current flowing in the chassis member. A high-frequency induced current generated in the voice circuit due to the discharge current flowing in the chassis member flows to a ground terminal through the high-frequency bypass unit.
    Type: Grant
    Filed: May 30, 2005
    Date of Patent: May 18, 2010
    Assignee: Panasonic Corporation
    Inventor: Kazunori Yamate
  • Patent number: 7719201
    Abstract: A microdevice has an electron emitter including a memory for accumulating electric charges corresponding to an input voltage, for emitting electrons corresponding to the electric charges accumulated in said memory; and an amplifier connected to a power supply and including a collector electrode for capturing the electrons emitted from the electron emitter. The atmosphere between at least the electron emitter and the collector electrode is a vacuum. When the electrons emitted from the electron emitter are captured by the collector electrode of the amplifier, a collector current flows between the collector electrode and the electron emitter to amplify the input voltage.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: May 18, 2010
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada
  • Patent number: 7719487
    Abstract: A method of driving a gas discharge device for displaying a frame with gradation. A charge producing voltage and a charge adjusting voltage are successively applied in an address preparation period to respective subfields.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: May 18, 2010
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: 7714515
    Abstract: According to an embodiment of the present invention, a system is provided for driving at least one light-emitting diode (LED). The system includes an output terminal connectable to an anode of the LED and at which an output voltage can be provided for the LED. A driver loop, connectable to a cathode of the LED, is operable to maintain a LED current flowing through the LED at a desired level, thereby attenuating modulation error attributable to voltage variations at the cathode of the LED.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: May 11, 2010
    Assignee: Integrated Memory Logic, Inc.
    Inventors: Necdet Emek, Mario Chunhwa Huang
  • Patent number: 7710362
    Abstract: An electron emission display (EED) includes an anode and a panel electrode unit comprising a scan electrode that extends in one direction of a lattice type panel and a data electrode that extends across the scan electrode. In the display and a method of driving the same, when power is supplied to the electron emission display, an anode voltage is applied to drive the anode, and a voltage is applied to at least one electrode of the panel electrode unit when the anode voltage is equal to or higher than a reference voltage.
    Type: Grant
    Filed: June 14, 2005
    Date of Patent: May 4, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Duck-Gu Cho
  • Patent number: 7710042
    Abstract: A PDP apparatus comprises, in a circuit part, a ramp output device which outputs a ramp wave to electrodes of a PDP. The ramp output device has a ramp generator which generates and outputs a first ramp wave of which inclination is variable, an impedance conversion circuit which receives the first ramp wave as input and outputs a second ramp wave produced by impedance conversion, and a feedback circuit which receives the second ramp wave as input and feeds it back to the input of the ramp generator. The ramp generator outputs the second ramp wave as a ramp wave (output voltage). Techniques to realize output of stabilized ramp wave in a PDP apparatus so as to stabilize PDP display operations are provided.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: May 4, 2010
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Takashi Shiizaki, Masaki Kamada, Akihiro Machida, Sojiro Hagihara
  • Patent number: 7710366
    Abstract: Each pixel includes: a light emitting element; a capacitor; a driving transistor that has a control terminal, an input terminal, and an output terminal and supplies a driving current to the light emitting element to emit light; a first switching unit that diode-connects the driving transistor and supplies a data voltage to the driving transistor in response to a scanning signal; and a second switching unit that supplies a driving voltage to the driving transistor and connects the light emitting element and the capacitor to the driving transistor in response to an emission signal, wherein the capacitor is connected to the driving transistor through the first switching unit, stores a control voltage being a function of the data voltage and the threshold voltage of the driving transistor, and is connected to the driving transistor through the second switching unit to supply the control voltage to the driving transistor.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: May 4, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-Hoon Lee, Bong-Hyun You, Min-Koo Han
  • Patent number: 7683545
    Abstract: A plasma display panel includes a first substrate, on which discharge sustain electrodes are formed, and an opposing second substrate, on which address electrodes are aligned in a first direction. Barrier ribs between the substrates define a plurality of discharge cells within which phosphor layers are formed. The display electrodes have bus electrodes, forming a corresponding pair within each of the discharge cells, and extension electrodes, extending from the bus electrodes into each of the discharge cells to form an opposing pair. A pair of the display electrodes corresponding to each of the discharge cells forms a first gap and a second gap having different distances from each other between the opposing extension electrodes, and forms a third gap between the bus electrodes. The second gap is longer than the first gap, and the third gap is longer than the second gap.
    Type: Grant
    Filed: November 29, 2004
    Date of Patent: March 23, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jae-Ik Kwon, Hye-Kyong Kwon, Tae-Kyoung Kang, Eun-Gi Heo
  • Patent number: RE41817
    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: February 19, 2009
    Date of Patent: October 12, 2010
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE41832
    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: February 19, 2009
    Date of Patent: October 19, 2010
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE41872
    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 20, 2006
    Date of Patent: October 26, 2010
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa