Fluid Light-emitting Display Elements (e.g., Gas, Plasma) Patents (Class 345/41)
  • Patent number: 7450087
    Abstract: A rear substrate of plasma display panel comprises a substrate, a plurality of address electrodes, a plurality of auxiliary address electrodes, a rib and a fluorescent layer. The rib is disposed on the substrate to define a plurality of discharge spaces. Each of the address electrodes is disposed in each of the discharge spaces. The auxiliary address electrodes are disposed between the substrate and the rib. When an address signal is inputted to the address electrodes, the auxiliary address electrodes are grounded for reducing the probability of error discharge. During sustain period, the auxiliary address electrodes are coupled to a positive voltage for preventing ion bombardment of phosphors layer.
    Type: Grant
    Filed: September 25, 2004
    Date of Patent: November 11, 2008
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Chao-Hung Hsu, Yu-Ting Chien
  • Publication number: 20080252557
    Abstract: A plasma display includes: a Plasma Display Panel (PDP), a chassis base having a first surface attached to the PDP; and a printed circuit board assembly arranged on a second surface of the chassis base and electrically connected to the PDP; the chassis base includes a plate portion attached to the PDP, and a boss integrally formed with the plate portion; and the boss includes a pillar portion protruding from the plate portion, and a supporting portion arranged on an upper end of the pillar portion. A method of manufacturing a PDP includes: forming a boss forming portion on a plate portion of a chassis base attached to a Plasma Display Panel (PDP); forming a pillar portion by causing the boss forming portion to protrude away from the PDP through a drawing process; and forming a supporting portion on an end of the pillar portion through a burring process.
    Type: Application
    Filed: March 21, 2008
    Publication date: October 16, 2008
    Inventor: Ji-Eun Lee
  • Publication number: 20080225374
    Abstract: In a reflective a display device based on layer break up or layer displacement having at least two different states, in which one of the fluids (5) e. g oil in a first state adjoins at least a first support plate (3) and in the second state the other fluid (6) at least partly adjoins the first support plate, in which picture elements are separated by areas (13) having a hydrophilic surface dyes (or sometimes pigments) are added to the oil (usually hydrocarbon but also possibly silicone or fluorocarbon), to provide sufficient optical intensity.
    Type: Application
    Filed: April 1, 2005
    Publication date: September 18, 2008
    Inventors: Robert A. Hayes, Mickael Joulaud, Thibault J. B. Roques-Carmes, Stephanie a. Palmier
  • Patent number: 7423611
    Abstract: A method of driving a display device has a calculating step, a comparing step, and a controlling step. The calculating step calculates a total number of light-emission pulses within a field, based on an average of display load factors in at least two fields, the comparing step compares the calculated number of light-emission pulses with a number of light-emission pulses based on power consumption, and the controlling step controls a smaller display load factor as the total number of light-emission pulses within a field.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: September 9, 2008
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Takayuki Ooe, Toshio Ueda, Kosaku Toda
  • Patent number: 7423864
    Abstract: A plasma display device comprises a plasma display panel, a chassis base for supporting the plasma display panel, and a circuit board assembly mounted on the chassis base with circuit elements for applying electrical signals required for driving the plasma display panel. The chassis base is bent with a curvature such that the curvature of the chassis base compensates for a curvature of the bent plasma display panel.
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: September 9, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Sok-San Kim, Tae-Kyoung Kang
  • Patent number: 7414597
    Abstract: A PDP driving circuit for a stable operation of a ramp pulse. A capacitor having a temperature characteristic opposite to a temperature characteristic of a part coupled to a switch that operates as a constant current source for generation of a ramp pulse is arranged in the driving circuit for generating a ramp pulse. The ramp pulse linearly increases or decreases a panel voltage of the PDP with respect to time. Parts having opposite temperature characteristics are coupled in parallel to control variation of a gradient of the ramp pulse so that values of the parts may not be varied depending on the temperature changes. Thus, stable operation of the ramp pulse is obtained.
    Type: Grant
    Filed: February 3, 2004
    Date of Patent: August 19, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Hak-Ki Choi, Sang-Chul Kim, Seung-Pil Mun, Kwang-Ho Jin, Sun-Kyung Ahn
  • Patent number: 7359108
    Abstract: An exemplary display device based on layer displacement having a perforated white substrate positioned close to a transparent substrate. Layer (fluid) displacement such as oil movement results in the (colored) oil film being pumped in a controlled manner above the white substrate. Fluids of three subtractive colors can be independently pumped to separate spaces. Based on the color strength of the used fluids good color rendition can be obtained for a flow channel thickness of less than 25 microns and therefore a total pixel thickness including the sub pixel reservoirs of less than 200 microns.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: April 15, 2008
    Assignee: Liquavista B.V.
    Inventors: Robert Andrew Hayes, Bokke Johannes Feenstra, Romaric Mathieu Massard
  • Patent number: 7358967
    Abstract: A method for driving a plasma display panel, including a reset period, an address period, and a sustain discharge period, wherein the reset period has a rising ramp section. During the rising ramp section of the reset period, a flat period of maintaining a peak voltage of a rising ramp applied to a scan electrode is maintained for longer than a period until a variation in a state of wall charges of the scan electrode is ended in all discharge cells.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: April 15, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Tae-Seong Kim, Woo-Joon Chung, Jin-Sung Kim, Kyoung-Ho Kang, Seung-Hun Chae
  • Patent number: 7355564
    Abstract: A plasma display panel (PDP) and driving method that includes a floating reset process. A number of subfields are generated from input video signals, and subfield data for each subfield are output. A first voltage is applied to the first electrode according to sustain information to cause a discharge in a first discharge space, and the first electrode is floated during a period which corresponds to subfield data of a previous subfield. During this process, the floating time is controlled according to the number of addressed cells called for in previous subfield data.
    Type: Grant
    Filed: August 2, 2004
    Date of Patent: April 8, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Kyoung-Ho Kang, Woo-Joon Chung, Jin-Sung Kim, Seung-Hun Chae
  • Publication number: 20080055195
    Abstract: A technique which relates to discharge in sustain operation of a PDP device and a driving waveform thereof, and which can improve luminous efficiency to achieve stability while reducing a possibility of failure of discharge is provided. In a generating operation of a sustain pulse in a sustain pulse generating circuit, after LU-ON (t1 to t2), a voltage applied on electrodes is raised up to a sufficiently-high voltage, namely, a sustain voltage according to an ON state of a CU circuit (t2 to t3), and discharge is started, CU is once turned OFF (t3), then a first discharge peak is formed (t11). Thereafter, CU is turned ON again before discharge is converged (t12) to raise a voltage value and form a second discharge peak (t14). Since a voltage Vi to start discharge is sufficiently high, a possibility of discharge failure is suppressed, and an effect of improvement in luminous efficiency is not ruined.
    Type: Application
    Filed: December 26, 2006
    Publication date: March 6, 2008
    Inventors: Keishin Nagaoka, Yoshikazu Kanazawa, Naoki Itokawa
  • Patent number: 7310073
    Abstract: The present invention relates to a plasma display panel, and more particularly, to an electrode structure of a plasma display panel capable of improving brightness and efficiency. According to a first embodiment of the present invention, in a plasma display panel of a long column structure having a front substrate and a rear substrate that are opposite to each other, the transparent electrodes of the scan electrodes or the sustain electrodes include projections projected toward the center of the discharge cells every discharge cell. Also, a discharge start voltage and a discharge sustain voltage can be lowered and brightness and efficiency can be increased. It is also possible to maintain color temperature equilibrium every RGB cell and to reduce an erroneous discharge of each cell.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: December 18, 2007
    Assignee: LG Electronics Inc.
    Inventors: Jae Bum Park, Sung Chun Choi
  • Publication number: 20070285350
    Abstract: A plasma display apparatus is provided to reduce noise. The plasma display apparatus includes a plasma display panel, a chassis which is disposed behind the plasma display panel and supports the plasma display panel, a circuit unit which is disposed behind the chassis and drives the plasma display panel, a signal transmitting member which transmits electrical signals generated in the circuit unit to the plasma display panel, and a cover plate which covers a portion of the signal transmitting member. A penetrating hole is formed on the cover plate.
    Type: Application
    Filed: March 19, 2007
    Publication date: December 13, 2007
    Inventors: Woo-Man Jeong, Se-Il Oh
  • Publication number: 20070279321
    Abstract: A plasma display apparatus is provided. The plasma display apparatus including an upper substrate; a plurality of first electrodes and second electrodes formed in the upper substrate; a lower substrate arranged to be opposite to the upper substrate; and a plurality of third electrodes and barrier ribs formed in the lower substrate includes a black matrix formed in the upper substrate to be overlapped with the barrier ribs; and a fourth electrode formed on the black matrix to intersect the third electrodes, wherein at least one of the plurality of first and second electrodes is formed in one layer.
    Type: Application
    Filed: March 22, 2007
    Publication date: December 6, 2007
    Inventors: Seong Nam Ryu, Woo Gon Jeon, Sang Min Hong, Woo Tae Kim, Kyung A. Kang, Jeong Hyun Hahm, Jae Sung Kim
  • Patent number: 7304620
    Abstract: The method and apparatus for displaying an image using liquid generate a segment fluid row, in which plural liquid masses each of which includes first liquid having at least one predetermined coloring matter and are separated from each other are arranged in a row shape, by sequentially and intermittently supplying predetermined amounts of the first liquid in accordance with image information of a desired image to be displayed to a flow path provided in accordance with an image display region for image displaying; and display the desired image in the image display region with the first liquid by causing the generated segment fluid row to move to a predetermined position of said flow path.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: December 4, 2007
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Ryoichi Yamamoto, Seiichi Inoue, Kenichi Kodama, Tsutomu Yokouchi, Kazuo Sanada, Koichi Kimura
  • Patent number: 7288012
    Abstract: A plasma display panel is provided that includes scan electrodes, sustain electrodes, and address electrodes. A first pulse voltage for the address electrodes or a second pulse voltage for the address electrodes is applied to the address electrodes in an aging step in which aging discharge is performed by alternately applying pulse voltage for the scan electrodes and pulse voltage for the sustain electrodes at least across the scan electrodes and the sustain electrodes. The first pulse voltage has a rising edge timing synchronized with a rising edge timing of the pulse voltage for the scan electrodes and a pulse width smaller than that of the pulse voltage for the scan electrodes. The second pulse voltage has a rising edge timing synchronized with a rising edge timing of the pulse voltage for the sustain electrodes and a pulse width smaller than that of the pulse voltage for the sustain electrodes.
    Type: Grant
    Filed: June 17, 2004
    Date of Patent: October 30, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koji Akiyama, Koji Aoto, Masaaki Yamauchi, Takashi Aoki, Akihiro Matsuda
  • Patent number: 7242372
    Abstract: A plasma display apparatus, in which a sustain output device (transistor) with a voltage rating in accordance with the sustain voltage can be used even when a voltage greater than the sustain voltage is applied to a sustain electrode in the reset period and the address period, has been disclosed, wherein, an X or a Y drive circuit, to which a voltage greater than the sustain voltage is applied, comprises a first switch provided between a second sustain drive transistor and the supply source of a second voltage, and the voltage is supplied to the sustain drive transistor in the state in which the first switch is open.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: July 10, 2007
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Makoto Onozawa, Michitaka Ohsawa, Tomokatsu Kishi, Yoshikazu Kanazawa
  • Patent number: 7227514
    Abstract: In an apparatus for driving a PDP, first and second switches are coupled in series between a power source V1 for supplying a voltage Vs/2 and a first terminal of the panel capacitor, and third and fourth switches are coupled in series between the first terminal of the panel capacitor and a power source V2 for supplying a voltage ?Vs/2. A capacitor is coupled between a contact of the first and second switches and a contact of the third and fourth switches, and is charged to voltage Vs/2. The withstand voltages of the first and second switches are clamped to the voltage Vs/2 while the voltage ?Vs/2 is applied to the first terminal of the panel capacitor. Likewise, the withstand voltage of the third and fourth switches are clamped to the voltage Vs/2 while the voltage Vs/2 is applied to the first terminal of the panel capacitor.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: June 5, 2007
    Assignee: Samsung SDI Co., Ltd
    Inventor: Jun-Young Lee
  • Patent number: 7224329
    Abstract: A PDP apparatus of low power consumption and without erroneous malfunctions is equipped with a sustaining circuit that prevents an on/off timing shift and deterioration of a sustaining pulse produced thereby. Phase adjusting circuits, which adjust the timing of the changing edge of the sustaining pulse, are provided for the sustaining circuit; the power recovery circuit is of improved efficiency; and power consumption is reduced by optimizing the timing of a changing edge of the sustaining pulse The circuit devices used in the sustaining circuits are classified according to delay times and sets of the circuit devices are selected so that the timing of a changing edge of the sustaining pulse falls within a predetermined allowance, and the selected sets of the circuit devices are set to the PDP.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: May 29, 2007
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Makoto Onozawa, Michitaka Ohsawa, Kenji Ishiwata, Takeshi Kuwahara, Yoshikazu Kanazawa, Kenji Kimura, Hidenori Ohnuki, Taizo Ohno
  • Patent number: 7208876
    Abstract: A plasma display panel. A first substrate and a second substrate are provided opposing one another with a predetermined gap therebetween. Address electrodes are formed on the second substrate. Barrier ribs are mounted between the first substrate and the second substrate, the barrier ribs defining a plurality of discharge cells. Also, red, green, and blue phosphor layers are formed within each of the discharge cells. Discharge sustain electrodes are formed on the first substrate. The barrier ribs comprise first barrier rib members formed substantially parallel to the direction of the address electrodes, and second barrier rib members obliquely connected to the first barrier rib members and intersecting over the address electrodes. The second barrier rib members are formed to different widths according to discharge cell color such that red, green, and blue discharge cells have different volumes.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: April 24, 2007
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Kyoung-Doo Kang, Woo-Tae Kim, Hun-Suk Yoo, Seok-Gyun Woo, Jae-Ik Kwon
  • Patent number: 7180481
    Abstract: A PDP display apparatus driving method for performing multi-level gradation display by constituting one frame of a plurality of subfields assigned different weights, wherein in a subfield in which a relative luminance ratio corresponds to a lowest weight, display is performed according to discharges in two periods only, the periods being an initialization period and a write period.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: February 20, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuhiro Yamada
  • Patent number: 7166961
    Abstract: An improved protective film for a plasma display panel and a fabricating method thereof are provided. The improved protective film has magnesium oxide (MgO) as its main component, and uses a slight addition of silicon (Si) to improve jitter characteristics experienced during the address period.
    Type: Grant
    Filed: October 2, 2003
    Date of Patent: January 23, 2007
    Assignee: LG Electronics, Inc.
    Inventor: Eung Chul Park
  • Patent number: 7145582
    Abstract: A method of driving a plasma display device that includes a plurality of scanning electrodes, a plurality of sustaining electrodes, and a plurality of data electrodes is such that, when m is any given integer, the data electrodes are applied with a negative polarity pulse when a voltage applied to the scanning electrodes gradually decreases during the initialization period, if a final pulse in a sustain period of an (m?1)-th subfield is applied to the scanning electrodes and an m-th subfield includes an initialization period. If the final pulse in the sustain period of the (m?1)-th subfield is applied to the sustaining electrodes and the m-th subfield includes the initialization period, the data electrodes are applied with a positive polarity pulse when a voltage applied to the scanning electrodes gradually increases during the initialization period.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: December 5, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katutoshi Shindo, Shigeyuki Okumura, Takatsugu Kurata, Nobuaki Nagao, Ryuichi Murai
  • Patent number: 7095173
    Abstract: A plasma display panel provides increased brightness over an entire screen while simultaneously reducing power consumption. The plasma display panel includes a rear substrate, a plurality of address electrodes disposed parallel to each other on the rear substrate, a first dielectric layer covering the address electrodes, light emitting cells defined by a barrier rib formed on the first dielectric layer and covered with fluorescent substance, a front substrate, a plurality of sustain electrode pairs, each of which includes a scan electrode and a data electrode and disposed on the front substrate and intersecting the address electrodes, and a second dielectric layer covering the sustain electrode pairs. The parts of the address electrodes which intersect the address electrodes are defined as discharging portions, and areas of subsequent discharging portions are larger than areas of preceding discharging portions.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: August 22, 2006
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jae-Ik Kwon, Kyoung-Doo Kang
  • Patent number: 7091668
    Abstract: A display and a driving method of a display panel capable of improving a dark contrast.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: August 15, 2006
    Assignees: Pioneer Corporation, Pioneer Display Products Corporation
    Inventors: Kazuo Yahagi, Mitsushi Kitagawa, Nobuhiko Saegusa, Shigeru Iwaoka, Tsutomu Tokunaga, Ryo Suzue
  • Patent number: 7079126
    Abstract: Plasma Display Panels are becoming more and more interesting for TV technology. One important criterion for picture quality is the Peak White Enhancement Factor PWEF. In a previous patent application a method for power level control in a display with which the PWEF can be increased has been proposed. With an increased PWEF the problem of local overheating of plasma cells may occur. This invention proposes a protection circuit, which deals with this problem. For protecting the plasma display against local overheating, there is provided a method, which performs the steps of local power value determination, local temperature estimation, maximum local temperature determination and maximum power level limit determination. The power level limit influences the power level control process in the display device so that local overheating is avoided and the highest possible PWEF can be used. The invention also concerns a corresponding apparatus for carrying out the proposed method.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: July 18, 2006
    Assignee: Thomson Licensing
    Inventors: Carlos Correa, Sébastien Weitbruch, Rainer Zwing
  • Patent number: 7053871
    Abstract: A method of driving a gas discharge tube is provided. Each field of images is divided into three periods for luminescence-rest, luminescence-preparing, and luminescence steps. During the luminescence-rest step, two voltages whose amplitudes are the same and constant are applied to two sustaining electrodes composing each pair, so that the sustaining electrodes rest the discharge. During the luminescence-preparing step, two voltage pulses whose phases are the same are applied to the two sustaining electrodes composing each pair and a voltage to cause a preparatory discharge is applied to an auxiliary electrode. And during the luminescence step, two voltage pulses whose phases are mutually shifted are applied to the two sustaining electrodes composing each pair, so that the sustaining electrodes cause discharges for the luminescence.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: May 30, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuo Tomida, Masaki Hirohashi, Jun Kuwata, Hiroko Imamura
  • Patent number: 7045963
    Abstract: A plasma display panel. Front and rear plates are spaced by a rib structure that is disposed on the rear plate with Neon gas filled therebetween. The rib structure partitions off the rear plate into a plurality of first, second and third sub-pixels adjacent to each other, wherein both of the first and second sub-pixels are smaller than the third one. Red, green and blue phosphors are disposed in the first, second and third sub-pixels respectively, wherein adjacent first, second and third sub-pixels form a pixel.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: May 16, 2006
    Assignee: AU Optronics Corp.
    Inventors: Po-Cheng Chen, Jiun-Han Wu, Chen-Kwang Pan
  • Patent number: 7015880
    Abstract: There is provided an address-while-display driving method for a surface discharge type triode plasma display panel, which includes sequentially performing resetting and addressing on each XY-electrode line pair while alternately and consecutively applying display voltages to all XY-electrode line pairs of the panel. The panel includes a front substrate and a rear substrate that are separately formed to face each other, X- and Y-electrode lines that are alternately arranged in parallel between the front and rear substrates to form the XY-electrode line pairs, and address electrode lines that are formed in perpendicular to the X- and Y-electrode lines. The address-while-display driving method includes lowering the display voltages during an addressing time for each XY-electrode line pair.
    Type: Grant
    Filed: November 18, 2002
    Date of Patent: March 21, 2006
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Joo-yul Lee, Kyoung-ho Kang
  • Patent number: 6995893
    Abstract: The invention provides an electro-optical device, a method of manufacturing an electro-optical device, an apparatus for manufacturing an electro-optical device, and an electronic apparatus, in which, in the electro-optical device, a gap formed between two substrates functioning as constituent elements thereof or the thickness of an adhesive layer, which adheres the two substrates to each other, can be precisely controlled. The electro-optical device has at least a substrate and a sealing substrate which is adhered to the substrate and which is composed of a transparent plate member, in which the substrate and the sealing substrate are adhered to each other with an adhesive layer provided therebetween so as to form a gap therebetween; measurement surfaces, used to measure the thickness of the adhesive layer, are provided in the gap; and on the measurement surfaces, an adhesive is not provided.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: February 7, 2006
    Assignee: Seiko Epson Corporation
    Inventor: Hidekazu Kobayashi
  • Patent number: 6947016
    Abstract: A method for driving a plasma display panel includes applying an erasing pulse, a reset pulse and a scan pulse respectively in each of an erasing period, a reset period and a scan period. In a reset period, a reset pulse with a waveform of a sloped ramp pulse is applied to the scan electrode. The sloped ramp pulse induces a discharge between the scan electrode and the address electrode in the middle of the period while the pulse voltage increases. This prevents extremely high discharges between the scan electrode and the address electrode and improves the contrast of the display. An apparatus that implements such method is also disclosed.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: September 20, 2005
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jin-Sung Kim, Jin-Boo Son, Jea-Hyuk Lim
  • Patent number: 6924795
    Abstract: A driving method of the present invention is adapted to a plasma display panel which includes first and second electrodes formed on a substrate, third electrodes formed in a direction intersecting the first and second electrodes, and a dielectric layer covering the first and second electrodes. The driving method includes the steps of generating an address discharge between the first and the third electrode to select a predetermined cell and sustain discharges between the first and the second electrode to produce light for display, and controlling the plasma display panel such that the discharge intensity of a sustain discharge in which the second electrode serves as the anode is smaller than the discharge intensity of a sustain discharge in which the first electrode serves as the anode.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: August 2, 2005
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Tatsuhiko Kawasaki, Takashi Sasaki
  • Patent number: 6903709
    Abstract: A plasma display panel and a method of driving the same are provided in which circuit elements necessary for controlling potentials of scan electrodes can be reduced without using a complicated multilayered wiring. In the plasma display panel, k (k?2) data electrodes, each of which is continuous from one end of a column to the other end, are arranged for each column of a matrix display. All scan electrodes in a display screen are classified into k groups, and one of k groups is assigned to k data electrodes in each column. Each data electrode is crossed with or opposed to scan electrodes belonging to the group that is assigned to the data electrode without overlapping a partition in a plan view and is crossed with or opposed to other scan electrodes with overlapping the partition.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: June 7, 2005
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Tatsuhiko Kawasaki, Hitoshi Hirakawa, Takashi Shiizaki, Takashi Sasaki
  • Patent number: 6900782
    Abstract: In the reset step for initializing an amount of wall charge in each of the plurality of discharge cells that define each of the picture elements in a plasma display panel, the number of reset discharges that are caused to occur in the discharge cells that handle the emission of light of at least one color within the picture element is greater than the number of reset discharges that are caused to occur in the discharge cells that handle the emission of light of the other color(s). The plasma display panel drive method provides a stable electrical discharge effect while increasing contrast.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: May 31, 2005
    Assignees: Pioneer Corporation, Shizuoka Pioneer Corporation
    Inventors: Tsutomu Tokunaga, Yoichi Sato
  • Patent number: 6870521
    Abstract: The present invention provides a plasma display driving method and driving device which can improve image display contrast. The method comprises an address step for shifting the discharge cells into an emission enable state when the discharge cells corresponding to each pixel of the plasma display panel are in an emission disable state, by selectively causing the discharge cells to perform a selective writing discharge in accordance with the pixel data of each pixel, based on a video signal, thus generating wall charges in the discharge cells; and, on the other hand, when the discharge cells are in an emission enable state, shifting the discharge cells into an emission disable state by selectively causing the discharge cells to perform a selective erasing discharge in accordance with the pixel data, thus erasing the wall charges in the discharge cells; and an emission sustain step for causing only those discharge cells which are in the emission enable state to emit light repeatedly.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: March 22, 2005
    Assignees: Pioneer Corporation, Pioneer Display Products Corporation
    Inventor: Takashi Iwami
  • Patent number: 6853358
    Abstract: A method for driving a plasma display panel is provided in which wasteful power consumption is reduced and ion bombardment that may deteriorate cells is suppressed for a long life of cells. A ratio of lighting that is a ratio of the number of cells to be lighted to a total number of cells is detected in accordance with display data that determine contents of addressing. In accordance with the detected ratio of lighting, a waveform of a voltage pulse that is applied in the sustaining step for displaying the corresponding display data is changed so that a gradient of the voltage change at a leading edge becomes smaller for a large value of the ratio of lighting than for a small value of the same.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: February 8, 2005
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Yasuhiko Kunii, Takashi Sasaki
  • Patent number: 6839069
    Abstract: A light emission display drive apparatus used as a light emission display drive circuit includes an at least second-order ?? modulator 3 for turning on/off a constant drive current or a constant drive voltage, thereby performing gradation control of each light emitting element. A pixel read section 2 reads the brightness value of each light emitting element in a predetermined period, the ?? modulator 3 performs ?? modulation in a predetermined period in response to the read brightness value, and an output change section 36 of the ?? modulator performs operations of detecting unevenness of a list of output pulses of the ?? modulation and dispersing the output pulses in the same light emitting element among light emitting elements, thereby performing multiple-step gradation control of the light emitting element.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: January 4, 2005
    Assignee: Pioneer Corporation
    Inventor: Yoshiyuki Okuda
  • Patent number: 6816134
    Abstract: There is provided a plasma display panel (PDP), consisting of a front panel (10) equipped with display electrodes (8) and a rear panel (4) equipped with address electrodes (3), that displays an image by causing discharge in a small discharge space formed between the two panels; wherein there are provided two layers of protective films (5, 6), made of metallic oxide, covering the dielectric layer (7) installed on the front panel (10); the outer, upper layer (6) being formed into a layer of material with a specific surface area of 20 m2/g or more and a film thickness of 1 &mgr;m or less, exhibiting a high discharge characteristic; and the inner, lower layer (5) being formed into a layer of material with a specific surface area of 10 m2/g or less and a film thickness of 1 &mgr;m or more, exhibiting a low water-adsorption characteristic.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: November 9, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Kajiyama, Akira Katou, Kenichi Onisawa, Tetsuro Minemura, Kazuo Uetani, Yasushi Ihara, Shiro Takigawa, Kouichi Nose, Isao Tokomoto, Yasuhiro Koizumi
  • Publication number: 20040212554
    Abstract: A plasma display device includes a plasma display panel (PDP). A chassis base supports the PDP from a surface of the same opposite a surface that displays images, and a plurality of driving circuit boards are mounted on the chassis base. A front cabinet is positioned adjacent to the surface of the plasma display panel that displays images. Also, a back cover is positioned adjacent to a surface of the chassis base opposite the surface adjacent to the PDP and is integrally assembled to the front cabinet with the chassis base and the plasma display panel interposed therebetween. The plasma display device also includes thermoelectric semiconductor devices that are mounted within the back cover. The thermoelectric semiconductor devices act to discharge heat generated by the PDP and the driving circuit boards to outside the back cover.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 28, 2004
    Inventors: Ki-Jung Kim, Tae-Kyoung Kang
  • Publication number: 20040183753
    Abstract: A PDP driving circuit for a stable operation of a ramp pulse. A capacitor having a temperature characteristic opposite to a temperature characteristic of a part coupled to a switch that operates as a constant current source for generation of a ramp pulse is arranged in the driving circuit for generating a ramp pulse. The ramp pulse linearly increases or decreases a panel voltage of the PDP with respect to time. Parts having opposite temperature characteristics are coupled in parallel to control variation of a gradient of the ramp pulse so that values of the parts may not be varied depending on the temperature changes. Thus, stable operation of the ramp pulse is obtained.
    Type: Application
    Filed: February 3, 2004
    Publication date: September 23, 2004
    Applicant: Samsung SDI Co. Ltd.
    Inventors: Hak-Ki Choi, Sang-Chul Kim, Seung-Pil Mun, Kwang-Ho Jin, Sun-Kyung Ahn
  • Patent number: 6774875
    Abstract: A method for compensating luminance, suitable for use in a plasma display panel. The method includes the following steps. First, the luminance value of each pixel signal is read out. Then, the load of the pixel signal row is computed. The load is the number of pixel signal in the pixel signal row that the luminance value of the pixel signal is larger than a predetermined threshold luminance value. Then, a primary luminance compensation value is decided according to the load of the pixel signal row. A number of secondary luminance compensation values are decided according to the primary luminance compensation value. Afterwards, each pixel signal in the pixel signal row is performed luminance compensation sequentially. If the luminance value is larger than or equal to a low threshold luminance value, the luminance value is subtracted by the primary luminance compensation value.
    Type: Grant
    Filed: March 29, 2002
    Date of Patent: August 10, 2004
    Assignee: AU Optronics Corp.
    Inventors: Shu-Rong Tong, Tu-Hao Tsai, Jih-Fon Huang
  • Publication number: 20040090395
    Abstract: The present invention provides a drive apparatus and method for a plasma display panel, in which the drive apparatus and method improve contrast and prevent mis-discharge. According to the drive method, in a reset interval of a first sub-field, a voltage having an increasing ramp waveform is applied to scan electrodes during a first interval, and common electrodes are floated during a portion of the first interval such that a voltage of the common electrodes is increased to a first voltage, which corresponds to a voltage applied to the scan electrodes and to a voltage applied to both sides of panel capacitors. Further, in a reset interval of a second sub-field, which exhibits a higher gray than the first sub-field, a voltage having an increasing ramp waveform is applied to the scan electrodes during a second interval, and floating the common electrodes during a portion of the second interval such that the voltage of the common electrodes is increased to a second voltage, which is less than the first voltage.
    Type: Application
    Filed: May 14, 2003
    Publication date: May 13, 2004
    Inventor: Jung-Pil Park
  • Publication number: 20040085262
    Abstract: A method for driving a plasma display panel that has a plurality of scan electrodes and sustain electrodes arranged in pairs, and a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes and being electrically isolated from the scan electrodes and the sustain electrodes. The method includes applying a voltage of a rising ramp waveform having at least two slopes and a voltage of a falling ramp waveform having at least two slopes to the scan electrodes during a reset period. Thus, the method applies the reset waveform having at least two slopes in the reset step so as to reduce the reset period and allow a stable reset operation.
    Type: Application
    Filed: July 24, 2003
    Publication date: May 6, 2004
    Inventor: Joo-Yul Lee
  • Publication number: 20040085263
    Abstract: In a PDP, an inductor is coupled to an electrode of a panel capacitor. A current of a first direction is injected to the inductor to store energy, and the voltage of the electrode is changed to Vs/2 using a resonance between the inductor and the panel capacitor and the stored energy. The difference between the Y electrode voltage Vs/2 and the X electrode voltage −Vs/2 causes a sustain on the panel. Subsequently, a current of a second direction, which is opposite to the first direction, is injected to the inductor to store energy therein. The voltage of the electrode is changed to −Vs/2 using a resonance between the inductor and the panel capacitor and the energy stored therein.
    Type: Application
    Filed: October 9, 2003
    Publication date: May 6, 2004
    Inventors: Jun-Young Lee, Seung-Woo Chang, Jin-Sung Kim, Hak-Ki Choi, Chan-Young Han
  • Patent number: 6703921
    Abstract: A method and a system of data transmission between a terminal for generating an electromagnetic field and a transponder, the terminal and the transponder each including an oscillating circuit forming an antenna, and the transponder including an electronic circuit adapted to absorbing and giving back power provided by the terminal field, the oscillating circuits of the transponder and of the terminal being capable of transmitting radio-electric signals of determined frequency, this method including causing a detuning of at least one of the oscillating circuits with respect to the determined frequency when the transponder and the terminal are very close to each other.
    Type: Grant
    Filed: April 5, 2000
    Date of Patent: March 9, 2004
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Michel Bardouillet, Jean-Pierre Enguent
  • Patent number: 6690388
    Abstract: A display apparatus creates, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weighing value for each subfield, and a number of gradation display points. The display apparatus detects a peak image brightness level and an average image brightness level. A weighing multiple including a positive integer part and a fractional part is determined based on the peak image brightness level and the average image brightness level. The weighing multiple is multiplied by the weighing value of each subfield to obtain a product capable of having a positive integer part and a fractional part. An integer value near the product is defined as a number of drive pulses for each subfield. The weighing multiple is increased as the average image brightness level decreases and as the peak image brightness level increases.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: February 10, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuhiro Kasahara, Yuichi Ishikawa, Tomoko Morita
  • Patent number: 6677920
    Abstract: A PDP driving method, at the first timing point of a reset period, a global voltage difference is applied between the sustaining electrodes and the scanning electrodes, wherein the gaseous discharge occurs only in the non-display areas, called the dark areas. Because the discharge during reset period does not occur in the display areas, the picture quality is assured from avoiding the emission of over-brightness in the reset period which enables the sequential gaseous discharge operations to proceed with smaller driving voltage.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: January 13, 2004
    Assignee: AU Optronics Corp.
    Inventors: Jih-Fon Huang, Shin-Tai Lo
  • Publication number: 20030214461
    Abstract: The present invention provides a device in the form of a filter which is useable in conjunction with a plasma display panel, which is applied to the front face of a display, and which functions to reduce reflection after assembly to acceptable levels, to increase contrast enhancement ratios, to reduce EMI emissions to levels which comply with consumer safety regulations and with military and aircraft standards and to reduce infrared transmission in the 800 nm-1000 nm range to a level which does not interfere with IR remote control operation. The present invention also relates to a method of making such a plasma display panel filter and device.
    Type: Application
    Filed: September 10, 2001
    Publication date: November 20, 2003
    Inventors: Daniel P. Woodruff, Jeffrey L. Kokoschke
  • Patent number: 6642911
    Abstract: A plasma display panel driving method capable of improving the contrast while preventing spurious borders. Only in the first subfield, a writing discharge is selectively produced only in discharge cells except for those serving to display a luminance level “0” to initialize these discharge cells to a light emitting cell state. Then, only in one of the remaining subfields except for the first subfield, an erasure discharge is selectively produced in the discharge cells remaining in the light emitting cell state in accordance with pixel data, causing the discharge cells to transition to a non-light emitting cell state. Only the discharge cells remaining in the light emitting cell state are driven to emit light the number of light emissions allocated thereto corresponding to a weighting factor applied to the subfield.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: November 4, 2003
    Assignee: Pioneer Corporation
    Inventors: Tetsuya Shigeta, Tetsuro Nagakubo, Hirofumi Honda
  • Patent number: 6608447
    Abstract: A plasma display panel and a driving method thereof is adaptive for realizing high efficiency. In the plasma display panel, a sustaining electrode pair and an address electrode are included in each discharge cell. A first dielectric layer covers the sustaining electrode pair. To induce a discharge of the sustaining electrode pair, a floating electrode pair is formed parallel thereto on the first dielectric layer. A second dielectric layer and a protective film cover the floating electrode pair. Accordingly, two auxiliary electrodes are provided between the sustaining electrode pair so that when a voltage is applied to the sustaining electrode pair, the voltage is driven into the auxiliary electrodes. A primary discharge is thus induced between said auxiliary electrodes at a low voltage and therefore a long-path discharge is induced between the sustaining electrode pair at a low voltage, even though they are distanced apart from each other.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: August 19, 2003
    Assignee: LG Electronics Inc.
    Inventor: Young Joon Ahn
  • Patent number: 6587084
    Abstract: The present invention provides a gray level display AC-type PDP driving method comprising (a) dividing a single image frame into n number of subframes, each of the subframes having predetermined number of sustaining pulses; (b) selecting scan electrodes whose number is identical to the number of said subframes, assigning specific subframes to said selected scan electrodes, sequentially providing scanning pulses having different phases on said selected scan electrodes and applying addressing pulses on said data electrodes in order to designate pixels to be displayed, and alternately supplying the predetermined number of sustaining pulses onto the selected scan electrodes and said data electrodes, to thereby display said assigned subframes for said selected display lines; (c) shifting by one or more than scan electrode(s) from each of said selected scan electrodes; and (d) repeating said shifting of step (c) and displaying of said assigned subframes until each of said divided subframes is displayed for all the
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: July 1, 2003
    Assignees: Orion Electric Co., Ltd., Research & Production Company “Orion-Plasma”
    Inventors: Youri Nikolaevich Alymov, Victor Markusovich Gutman, Anatoly Borisovich Pokryvailo