Fluid Light Emitter (e.g., Gas, Liquid, Or Plasma) Patents (Class 345/60)
  • Patent number: 8212746
    Abstract: In a driving method of a panel, one field period is formed by arranging a plurality of subfields that have an initializing period for causing initializing discharge in a discharge cell, an address period for selectively causing address discharge in the discharge cell, and a sustain period for causing as many sustain discharges as the number corresponding to luminance weight in the discharge cell. One field period is formed by arranging a plurality of subfield groups having a plurality of subfields whose luminance weights monotonically increase. A holding period when discharge is not caused is disposed before the head subfield belonging to at least one subfield group of the plurality of subfield groups. In the initializing period of the head subfield belonging to at least one subfield group, an initializing operation of causing initializing discharge is performed in the discharge cell where the sustain discharge has been performed in the sustain period of the immediately preceding subfield.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: July 3, 2012
    Assignee: Panasonic Corporation
    Inventors: Keiji Akamatsu, Minoru Takeda, Kenji Ogawa, Hiroshi Ibaraki
  • Patent number: 8212745
    Abstract: In a driving method of a panel, one field period is formed by arranging a plurality of subfields that have an address period for selectively causing address discharge in a discharge cell, and a sustain period for causing as many sustain discharges as the number corresponding to luminance weight in the discharge cell. One field period is formed by arranging a plurality of subfield groups having a plurality of subfields whose luminance weights monotonically increase. In the discharge cell for causing address discharge in a certain subfield other than the head subfield in each subfield group, address discharge is caused even in the head subfield.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: July 3, 2012
    Assignee: Panasonic Corporation
    Inventors: Minoru Takeda, Kenji Ogawa, Keiji Akamatsu
  • Patent number: 8207913
    Abstract: A plasma display panel; a scan electrode drive circuit for generating a gently decreasing downward inclined waveform voltage in an initializing period, a gently increasing first inclined waveform voltage, and a second inclined waveform voltage having a steeper gradient than the first inclined waveform voltage and decreasing immediately after the increasing waveform voltage reaches a predetermined potential in the last part of the sustain period. The lowest voltage in the downward inclined waveform voltage is switched at a first voltage, a second voltage higher than the first voltage and a third voltage higher than the second voltage to generate a downward inclined waveform voltage. The lowest voltage is switched according to the detected temperature to generate the downward inclined waveform voltage.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: June 26, 2012
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Ibaraki, Minoru Takeda, Keiji Akamatsu, Kenji Ogawa, Nobuhiko Nakamura
  • Patent number: 8207911
    Abstract: A display device includes two or more plasma tube array units to provide a large sized screen. Each plasma tube array unit includes pairs of scan and sustain electrodes. The plasma tube array units are disposed adjacent to each other in a longitudinal direction of the scan and sustain electrodes. One scan driver which selectively applies a scan signal to the scan electrodes is coupled to the two adjacent plasma tube array units at a position between the two adjacent plasma tube array units. Two sustain voltage drivers which apply respective sustain voltage to the sustain electrodes are coupled to the sustain electrodes of the two respective adjacent plasma tube array units on two respective outermost sides of the two respective adjacent plasma tube array units.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: June 26, 2012
    Assignee: Shinoda Plasma Co., Ltd.
    Inventors: Manabu Ishimoto, Hitoshi Hirakawa, Kenji Awamoto
  • Patent number: 8207912
    Abstract: Sustain pulses are alternately applied to a pair of display electrodes of discharge cells provided in a plasma display panel (PDP) to generate a sustain discharge to display an image on the PDP. The sustain pulses include two-crests discharge voltage waveforms having a first maximum and second maximum values, in which discharges are generated twice in a half cycle. After applying a sustain pulse having a one-crest discharge voltage waveform to a pair of display electrodes, a predetermined number of sustain pulses of two-crests discharge voltage waveforms are consecutively applied. A time, from applying a second sustain pulse of a two-crests discharge voltage waveform to clamping a voltage of the second sustain pulse to the second maximum value, is made longer than a time, from applying a first sustain pulse of a two-crests discharge voltage waveform to clamping a voltage of the first sustain pulse to the second maximum value.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: June 26, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Naoki Itokawa, Katsumi Ito, Masaki Kimura, Junichi Kumagai, Yasunobu Hashimoto, Tomokatsu Kishi
  • Patent number: 8203509
    Abstract: A problem is to be solved that there is to be provided a plasma display device capable of generating driving signals with less variation in delay time and without carrying out any phase adjustment. There is provided a plasma display device including; a first display electrode; a second display electrode adapted to cause a discharge to occur between the first display electrode and the second display electrode; a first display electrode drive circuit for applying a discharge voltage to the first display electrode; and a second display electrode drive circuit for applying a discharge voltage to the second display electrode. The first display electrode drive circuit has a first output element for supplying a first electric potential to the first display electrode in accordance with a first input signal which is inputted by using a transformer.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: June 19, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Onozawa, Tomokatsu Kishi, Hideaki Ohki, Masaki Kamada
  • Patent number: 8203549
    Abstract: A plasma display panel driving method and a plasma display apparatus are disclosed in which a suitable address discharge can be performed at a next scanning timing by reducing voltage changes in a sustain electrode and a scan electrode caused by a change of an address pulse when the address pulse is applied to an address electrode at a scanning timing. The plasma display panel driving method drives a plasma display panel which includes plural scan electrodes extending in a first direction and plural address electrodes extending in a second direction orthogonal to the first direction. In the method, a negative polarity scan pulse is applied to a scan electrode, a positive polarity address pulse is applied to an address electrode from an address electrode driving circuit, and an address discharge is generated.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: June 19, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hidenori Ohnuki, Akihiro Machida, Yoshinori Okada, Tomohiro Mitou, Satoshi Yuri
  • Patent number: 8203507
    Abstract: A drive method of a plasma display panel that can increase the dark contrast, without causing a discharge failure. When a discharge cell that assumes a black display state in a first field from among first and a second fields that are adjacent in time and switches to a display state representing a brightness other than black in the second field is detected as a lighting transition cell, at least one drive of the below-described first and second forced lighting drives is executed. In the first forced lighting drive, the lighting transition cell is forcibly set into the lighting mode only in the address process of a predetermined subfield within the field in the first field. In the second forced lighting drive, an adjacent discharge cell that is adjacent to the lighting transition cell is forcibly set into the lighting mode only in the address process of the predetermined subfield in the second field.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: June 19, 2012
    Assignee: Panasonic Corporation
    Inventors: Shunsuke Itakura, Mitsuhiro Ishizuka, Kazuo Yahagi, Tetsuya Shigeta, Hirofumi Honda
  • Patent number: 8203508
    Abstract: A plasma display device includes a plasma display panel having a scan driver including a falling reset signal/scan low signal generating circuit that includes: a first switch coupled to a scan electrode, a second switch coupled in series with the first switch and coupled to a scan low voltage source having a scan low voltage, a first driving circuit having an output terminal coupled to a control terminal of the first switch and a ground terminal coupled to the first and second switches, a second driving circuit having an output terminal coupled to a control terminal of the second switch and a ground terminal coupled to the second switch and the scan low voltage source, a control Zener diode between the control terminals of the first and second switches, and a control resistor between the control terminal of the second switch and the scan low voltage source.
    Type: Grant
    Filed: August 6, 2008
    Date of Patent: June 19, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jinho Yang
  • Publication number: 20120146974
    Abstract: A plasma display panel has a first substrate, plural pairs of display electrodes, a second substrate, and plural data electrodes. Each pair of the display electrodes is made up of a scanning electrode and a sustain electrode which are arranged parallel to each other on the first substrate. The second substrate is disposed opposite to the first substrate. A discharge space is formed between the first substrate and second substrate. The data electrodes are arranged in a direction perpendicular to the display electrodes on the second substrate. The data electrode is wider in peripheral portion of the second substrate than in a central portion of the second substrate.
    Type: Application
    Filed: February 22, 2012
    Publication date: June 14, 2012
    Applicant: Panasonic Corporation
    Inventors: Tomohiro MURAKOSO, Kenji Ogawa, Toru Ando, Kentaro Ueda, Yohei Koshio, Ryuichi Murai
  • Patent number: 8199072
    Abstract: A scan electrode driving circuit applies a rising ramp waveform voltage to scan electrodes (SCN1 to SCNn) to generate a first setup discharge in a first period within a setup period, applies a dropping ramp waveform voltage to the scan electrodes (SCN1 to SCNn) to generate a second setup discharge in a second period following the first period within the setup period, and applies a first positive rectangular waveform voltage (Vs), a negative rectangular waveform voltage (Va), a second positive rectangular waveform voltage (Vs) and a dropping ramp waveform voltage to the scan electrodes (SCN1 to SCNn) in a third period following the second period within the setup period.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: June 12, 2012
    Assignee: Panasonic Corporation
    Inventors: Toshiyuki Maeda, Hidehiko Shoji
  • Publication number: 20120139956
    Abstract: An apparatus providing a viewer with a blend of displayed and reflected content. The apparatus includes an emissive display device with a display screen operable providing digital content. The emissive display device includes a light source selectively articulating and transmitting light through the display screen at a particular illumination level to display digital content such as text and graphics. The apparatus includes a thematic overlay positioned over the display screen with a front surface configured to provide diffuse reflection of light striking the front surface from a viewer space such that the front surface appears substantially opaque to the viewer and the viewer cannot see the display screen when the light source is inactive or at low brightness. When the light source is in active mode, the displayed content is visible as emissive display content concurrently with the diffuse reflection content but the display screen remains hidden from view.
    Type: Application
    Filed: December 2, 2010
    Publication date: June 7, 2012
    Applicant: DISNEY ENTERPRISES, INC.
    Inventors: DANIEL M. JOSEPH, MARK A. REICHOW, DAVID A. SHIRLEY, JAMES D. MOORE, EVERETT KEVIN THOMAS
  • Patent number: 8194004
    Abstract: A plasma display driving method capable of displaying a vigorous image having enhanced maximum luminance and contrast. For this purpose, one field is divided into a plurality of sub-fields each including a sustain period. In the sustain period, the number of sustain pulses obtained by multiplying a proportionality factor by a brightness weight set for each of the sub-fields are applied to display electrode pairs to generate sustaining discharge in discharge cells having generated addressing discharge therein. Thus, the total number of the sustain pulses in one field period can be changed. When a predetermined image meeting predetermined conditions is displayed, the total number of the sustain pulses in one field period is made larger than those in the case where the other normal images are displayed.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: June 5, 2012
    Assignee: Panasonic Corporation
    Inventors: Kenji Nishimura, Akira Yawata, Hironari Taniguchi
  • Patent number: 8194003
    Abstract: In a plasma display device, one frame is divided into a plurality of subfields having respective luminance weights, and a first line load ratio is measured from a plurality of video signals corresponding to a first row electrode among a plurality of row electrodes during the respective subfields. A first output estimation weight of each subfield is set based on the first line load ratio of each subfield in the first row electrode. The plurality of video signals corresponding to the first row electrode are converted into a plurality of first subfield data based on the first output estimation weight, and a driving signal is applied to the first row electrode and the plurality of column electrodes according to the plurality of first subfield data.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: June 5, 2012
    Assignees: Samsung SDI Co., Ltd., Seoul National University Industry Foundation
    Inventors: Jin-Sung Kim, Hyuk-Jae Lee
  • Patent number: 8188661
    Abstract: A plasma display panel (PDP), which is capable of performing a display with a high brightness and having a low power consumption, includes a front panel having display electrodes formed, a dielectric layer covering the display electrodes, and a protective layer formed on the dielectric layer. Further, the PDP includes rear panel having address electrodes formed along a direction intersecting the display electrodes, and barrier ribs. The front and rear panels form, therebetween, a discharge space portioned by the barrier ribs and filled with discharge gas. A protective layer is formed of a metal oxide of MgO and CaO, such that an X-ray diffraction analysis on a surface of the protective layer indicates that the metal oxide has a peak between a diffraction angle where a peak of MgO occurs and a diffraction angle where a peak of CaO occurs along an identical orientation of the MgO peak.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: May 29, 2012
    Assignee: Panasonic Corporation
    Inventors: Jun Hashimoto, Masashi Gotou, Yasuyuki Noguchi
  • Patent number: 8188992
    Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: May 29, 2012
    Assignee: LG Electronics Inc.
    Inventors: Sang Jin Yoon, Eung Chul Park, Bong Koo Kang, Jung Gwan Han
  • Patent number: 8188939
    Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: May 29, 2012
    Assignee: LG Electronics Inc.
    Inventors: Sang Jin Yoon, Eung Chul Park, Bong Koo Kang, Jung Gwau Han
  • Patent number: 8188938
    Abstract: A plasma display device including: a display panel for displaying an image according to a driving signal converted from an external image signal; a logic controller for measuring a temperature of the display panel for comparison with a temperature section information having at least two temperature sections, generating a driving control signal for changing the driving signal when the temperature of the display panel changes to a temperature of a different temperature section, and calculating a changing condition included in the driving control signal for determining a changing time of the driving signal; and a driver for supplying the driving signal that is changed according to the temperature section at the changing time determined by the changing condition of the driving control signal.
    Type: Grant
    Filed: April 21, 2008
    Date of Patent: May 29, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Hyukjun Jang
  • Patent number: 8184073
    Abstract: A plasma display apparatus and a method of driving the same are disclosed. The plasma display apparatus includes a plasma display panel in which a plurality of scan electrodes, sustain electrodes, and address electrodes are formed on substrates to form a discharge cell and electrode driving parts for driving the scan electrodes, the sustain electrodes, and the address electrodes. The plurality of scan electrodes are divided into a plurality of scan electrode groups and the driving parts are controlled such that a voltage different from a scan bias voltage is applied for a predetermined time in the address period of one or more scan electrode groups among the plurality of scan electrode groups.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: May 22, 2012
    Assignee: LG Electronics Inc.
    Inventor: Jeong Pil Choi
  • Patent number: 8184072
    Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: May 22, 2012
    Assignee: LG Electronics Inc.
    Inventors: Sang Jin Yoon, Eung Chul Park, Bong Koo Kang, Jung Gwan Han
  • Patent number: 8184115
    Abstract: Disclosed here is a method for driving a plasma display panel and a plasma display device capable of providing image display with a high contrast ratio and excellent quality by stabilizing an address discharge. According to the method, which is the method for driving a plasma display panel in which discharge cells are formed at intersections of scan electrodes, sustain electrodes and data electrodes, the field—that contains at least one sub-field having the all-cell initializing operation—and the field—that is formed of sub-fields having the selective-cell initializing operation only—are set at a ratio of 1:N (where, N takes an integer of 1 or greater). At the same time, at least in one sub-field of the field having the selective-cell initializing operation only, the scan-pulse width employed for the selective-cell initializing field is determined longer than the scan-pulse width employed for the field containing the all-cell initializing operation.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: May 22, 2012
    Assignee: Panasonic Corporation
    Inventors: Takateru Sawada, Takahiko Origuchi
  • Publication number: 20120120032
    Abstract: The present method is to drive a plasma display panel which displays a frame composed of a plurality of sub-fields having different weights of luminance. The method comprises using plural kinds of application voltage waveforms different in light emission luminance, as pulse voltages for sustain discharges in display of each sub-field, and adjusting the number of waves in each of the plural kinds of application voltage waveforms according to the weight of luminance set for each sub-field, thereby performing gradation display.
    Type: Application
    Filed: January 19, 2012
    Publication date: May 17, 2012
    Applicant: HITACHI, LTD.
    Inventors: Kazushige TAKAGI, Tadayoshi KOSAKA
  • Patent number: 8179342
    Abstract: Provided are a method and apparatus for driving a PDP for widening a driving margin and improving contrast. The method for driving a PDP includes a first step of forming wall charges in cells with a set-up discharge using a set-up signal in a first sub-field and erasing the wall charges with a set-down discharge using a first set-down signal to initialize the cells, and a second step of erasing the wall charges with a set-down discharge generated using a second set-down signal different from the first set-down signal in a second sub-field, to initialize the cells. The method and apparatus for driving a PDP uniformly initialize sub-fields to widen the driving margin of PDP and remove a set-up discharge in at least one sub-field to improve the contrast of PDP.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: May 15, 2012
    Assignee: LG Electronics Inc.
    Inventors: Hee Jae Kim, Chang Young Kwon, Jeong Pil Choi, Seong Ho Kang
  • Patent number: 8179341
    Abstract: An image signal processing circuit of a plasma display device includes an image data replacement circuit for replacing image data for a predetermined subfield with image data having less power consumption in a data electrode drive circuit; a power calculating circuit for calculating power consumption in the data electrode drive circuit and outputting power consumption for each field as field power; a power predicting circuit for predicting the field power when the number of predetermined subfields is decreased and outputting it as predicted field power; and an SF determination circuit. The SF determination circuit increases the number of predetermined subfields when the field power is not less than a predetermined power threshold, and decreases the number of predetermined subfields when the field power is less than the predetermined power threshold and the predicted field power is less than the predetermined power threshold.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: May 15, 2012
    Assignee: Panasonic Corporation
    Inventor: Kazuhiro Yamada
  • Patent number: 8174822
    Abstract: A plasma display device includes a plasma display panel (PDP) having electrodes between front and rear substrates, a chassis base on an outer surface of the PDP, a printed circuit board assembly (PBA) on the chassis base, a flexible printed circuit (FPC) connecting the PBA to the electrodes of the PDP, an anisotropic conductive film between terminals of the electrodes and a terminal of the FPC, and a sealing member surrounding the terminals of the electrodes and the terminal of the FPC, the sealing member including a surface hydrophobic modifying layer and an insulation layer.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: May 8, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Chul-Hong Kim, Jung-Keun Ahn, Hyun-Mi Jeong, Sung-Bae Kim, Bu-Kyeong Mo, Jeong-Rok Cha
  • Patent number: 8174513
    Abstract: An apparatus and method for driving a display panel, and more particularly, an apparatus and method for easily generating a programmable signal to drive a digital display panel without re-designing a drive signal generating apparatus according to the specifications of the digital display panel including its size, the number of scan lines, and types of input signals. The apparatus includes a memory, a decoder, and an output waveform generating circuit. The memory stores information to generate a plurality of drive pulse signals necessary for driving the display panel. The decoder reads information stored in an address assigned according to a predetermined control sequence from the memory and then edits the read information so as to be suitable for specifications of the display panel. The output waveform generating circuit generates drive pulse signals corresponding to the information read by the decoder.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: May 8, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Koichi Sono, Young-sun Kim, Tae-young Lee
  • Patent number: 8159487
    Abstract: A plasma display device includes a scan electrode drive circuit including a sustain pulse generating circuit, which includes an electric power recovery capacitor, a first recovery switch and a first recovery inductor connected in series so as to form an electric current passage in which an electric current is allowed to flow from the electric power recovery capacitor to a scan electrode, a second recovery switch and a second recovery inductor connected in series so as to form an electric current passage in which an electric current is allowed to flow from the scan electrode to the electric power recovery capacitor, a first damper capacitor connected to a node between a diode of the first recovery switch and the first recovery inductor, and a second damper capacitor connected to a node between a diode of the second recovery switch and the second recovery inductor.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: April 17, 2012
    Assignee: Panasonic Corporation
    Inventors: Fumito Kusama, Masaaki Kuranuki, Hironori Konno
  • Patent number: 8159418
    Abstract: A plasma display and a driving method thereof. The plasma display includes a plurality of first electrodes, a first switch, a second switch, a third switch, and a first capacitor. The first switch is connected between a first power source to supply a first voltage and the plurality of first electrodes. The second switch includes a first terminal electrically connected to the plurality of first electrodes, a second terminal connected to a second power source to supply a second voltage that is lower than the first voltage, and a gate connected to a signal input terminal. The third switch includes a first terminal electrically connected to the plurality of first electrodes, and a gate electrically connected to the first signal input terminal. The first capacitor includes a terminal connected to the second power source, and another terminal connected to a node of the first power source and a second terminal of the third switch.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: April 17, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jin-Ho Yang
  • Publication number: 20120086691
    Abstract: A display apparatus is described that includes a plurality of electrofluidic chromatophore (EFC) pixel cells. Each pixel cell comprises a fluid holder for holding a polar fluid and a non-polar fluid having differing display properties, the fluid holder comprising a reservoir with a geometry having a small visible area projected in the direction of a viewer onto the polar fluid, and a channel with a geometry having a large visible area projected in the direction of a viewer onto the polar fluid. The channel is connected to the reservoir so as to enable free movement of the polar fluid and non-polar fluid between the channel and the reservoir. At least part of a surface of the channel comprises a wetting property responsive to a supply voltage over the pixel cell and defining (i) a stable region wherein the supply voltage stabilizes polar fluid in the channel; (ii) a fill region that controls filling of polar fluid in the channel and (iii) a retract region that controls retracting of polar fluid in the channel.
    Type: Application
    Filed: October 6, 2010
    Publication date: April 12, 2012
    Applicant: Polymer Vision B.V.
    Inventors: Petrus Johannes Gerardus van Lieshout, Hjalmar Edzer Ayco Huitema
  • Patent number: 8154476
    Abstract: A plasma display device includes plasma display panel and a data driver. Plasma display panel includes a front substrate and a rear substrate faced to each other to form a discharge space therebetween. The front substrate includes a plurality of display electrodes, each having scan electrode and sustain electrode. The rear substrate includes a plurality of data electrodes intersected with the display electrodes. Discharges cells are formed at the intersections of the display electrodes and data electrodes. Data electrodes have a plurality of main electrode parts) formed in portions facing the display electrodes, and wiring parts that connect main electrode parts and have a width smaller than the widths of main electrode parts. Further, the corner of main electrode part is chamfered.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: April 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Tetsuya Shirai, Katsutoshi Shindo
  • Patent number: 8154542
    Abstract: In a plasma-display-panel driving method, a field period is divided into a plurality of sub fields, each of which has an address period for allowing discharge cells to selectively generate an address discharge and a sustain period for allowing the discharge cells having generated the address discharge to generate a sustain discharge by a number of times corresponding to a brightness weight. In the sustain period, a period for setting display electrode pairs to the base potential is disposed between the sustain pulse for causing the final sustain discharge in the sustain period and the previous sustain pulse. In a time interval corresponding to the lighting ratio of the discharge cells in the sub field after applying to the display electrode pairs a voltage for generating the final sustain discharge, a voltage for reducing the potential difference between electrodes of the display electrode pairs is applied to the display electrode pairs.
    Type: Grant
    Filed: February 5, 2007
    Date of Patent: April 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Hidehiko Shoji, Takahiko Origuchi, Mitsuo Ueda
  • Patent number: 8154475
    Abstract: The present invention relates to a plasma display device and a driving method thereof. The plasma display device includes a first switch, and a second switch. The first switch has a first end electrically connected to a first power source that supplies a first voltage and a second end electrically connected to the plurality of first electrodes, and gradually increases a voltage of the plurality of first electrodes during a reset period. The second switch has a first end electrically connected to a second power source that supplies a second voltage that is less than the first voltage and a second end electrically connected to the plurality of first electrodes. The first and second switches are simultaneously turned on in the reset period.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: April 10, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jin-Ho Yang
  • Publication number: 20120081350
    Abstract: A plasma display apparatus including a capacitive load and a driving circuit is provided. The plasma display apparatus includes a driving power source supplying a drive voltage to the capacitive load and a reference potential terminal supplying a reference potential to the capacitive load. A drive IC is coupled to the driving power source.
    Type: Application
    Filed: December 14, 2011
    Publication date: April 5, 2012
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Yuji SANO, Akihiro Takagi, Tomokatsu Kishi, Toyoshi Kawada, Hirokazu Inoue
  • Publication number: 20120081418
    Abstract: Even in a high-definition panel, an address operation is stabilized by suppressing an abnormal discharge in the address period, and the image display quality is enhanced. For this purpose, the plasma display panel is driven for gradation display in a manner such that a plurality of subfields are set in one field and sustain discharges in a number of times in response to the luminance weight set for each subfield are generated in the sustain period.
    Type: Application
    Filed: June 15, 2010
    Publication date: April 5, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Naoyuki Tomioka, Takahiko Origuchi, Yuichi Sakai
  • Patent number: 8149202
    Abstract: A flat display and a method for modulating a clock signal for driving a flat display are provided. The flat display includes a clock generator and a clock modulator. The clock generator provides a clock signal that includes at least a first cycle waveform and a second cycle waveform following said first cycle waveform. The first cycle waveform is modulated by the clock modulator as a first modulated cycle waveform divided by a first positive modulated cycle waveform and a first negative modulated cycle waveform, and the second cycle waveform is modulated as a second modulated cycle waveform divided by a second positive modulated cycle waveform and a second negative modulated cycle waveform. The first positive modulated cycle waveform and the first negative modulated cycle waveform have a first duration difference, and the second positive modulated cycle waveform and the second negative modulated cycle waveform have a second duration difference different from the first duration difference.
    Type: Grant
    Filed: January 4, 2008
    Date of Patent: April 3, 2012
    Assignee: Chimei Innolux Corporation
    Inventors: Jian-Xun Jiang, Chih-Hsun Weng
  • Patent number: 8149184
    Abstract: The initial color temperature setting can change when a plasma display panel (PDP) is driven for a long period of time. One cause is due to the non-uniform deterioration of red, green, and blue fluorescent materials due to the ultraviolet rays discharged during operation of the panel. Color temperature correction is performed by setting the numbers of discharge pulses for fluorescent materials in accordance with a discharge pulse number correction curve with respect to the cumulative elapsed driven time of the PDP.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: April 3, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hidenao Kubota, Hirofumi Sakamoto, Masahiko Umeda, Masatoshi Sudo
  • Publication number: 20120075283
    Abstract: In a driving method for a plasma display panel, in the initializing period in at least one of a plurality of subfields, selective initializing operation is performed that selectively causes initializing discharge only in a discharge cell having undergone address discharge in an immediately preceding address period. The selective initializing operation includes the step of applying first voltage to the sustain electrode and applying an up-ramp waveform voltage to the scan electrode, the step of applying a first down-ramp waveform voltage to the scan electrode and then applying a positive rectangular voltage to it, and the step of applying second voltage higher than the first voltage to the sustain electrode and applying a second down-ramp waveform voltage to the scan electrode.
    Type: Application
    Filed: June 7, 2010
    Publication date: March 29, 2012
    Applicant: Panasonic Corporation
    Inventors: Yutaka Yoshihama, Kenji Ogawa, Takateru Sawada, Toshiyuki Maeda, Keiji Akamatsu
  • Patent number: 8144172
    Abstract: A color temperature correction device corrects, in a display device that represents brightness of RGB of a video signal by a plurality of levels of gray scales, a color temperature of the video signal. The color temperature correction device includes: a recording means of storing a gray scale value conversion table for an input gray scale value of a video signal to set gray scale values for respective RGB, so that a consistent color temperature is maintained; and a gray scale value converting unit that converts the input gray scale value to set gray scale values, based on the gray scale value conversion table.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: March 27, 2012
    Assignee: Panasonic Corporation
    Inventor: Tomoko Morita
  • Patent number: 8144142
    Abstract: A first impedance control circuit includes a plurality of capacitors connected in parallel with a first transistor, and a second impedance control circuit includes a plurality of capacitors connected in parallel with a second transistor. Capacitors in the first impedance control circuit respectively have different capacitance values, and capacitors in the second impedance control circuit respectively have different capacitance values. The respective self-resonance frequencies of the capacitors in the first impedance control circuit differ, and the respective self-resonance frequencies of the capacitors in the second impedance control circuit differ. Switching noises each having a plurality of frequencies generated from first and second transistors are respectively absorbed in a power supply terminal and a ground terminal through the first and second impedance control circuits.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: March 27, 2012
    Assignee: Panasonic Corporation
    Inventor: Kazunori Yamate
  • Patent number: 8144082
    Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: March 27, 2012
    Assignee: LG Electronics Inc.
    Inventors: Sang Jin Yoon, Eung Chul Park, Bong Koo Kang, Jung Gwan Han
  • Publication number: 20120068987
    Abstract: In the driving method of a plasma display panel, one field contains a plurality of subfields and each of which has the following periods: an address period for generating an address discharge; a sustain period where a voltage is applied to data electrodes and sustain pulses corresponding to luminance weight are applied to scan electrodes and sustain electrodes for generating a sustain discharge; and an erase period where a voltage is applied to the scan electrodes and the sustain electrodes for generating an erase discharge. The erase discharge is generated selectively in the discharge cell having undergone an address discharge in the immediately preceding address period. In the sustain period of at least one of the subfields, a voltage to be applied to the data electrodes of the discharge cells having green phosphors is lower than that to be applied to the data electrodes of the discharge cells having red phosphors.
    Type: Application
    Filed: June 8, 2010
    Publication date: March 22, 2012
    Applicant: Panasonic Corporation
    Inventor: Yutaka Yoshihama
  • Patent number: 8138995
    Abstract: A plasma display device includes the following elements: an image signal conversion circuit for converting an image signal into an image data; a data electrode driver circuit for driving data electrodes according to the image data; a power calculation circuit for calculating a power consumption of the data electrode driver circuit according to the image data; and a temperature calculation circuit for calculating a temperature of the data electrode driver circuit according to the image data. The image signal conversion circuit converts the image signal into an image data decreasing the power consumption of the data electrode driver circuit at least when the calculated power consumption exceeds a predetermined power threshold value, or when the calculated temperature exceeds a predetermined temperature threshold value.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: March 20, 2012
    Assignee: Panasonic Corporation
    Inventors: Takeru Yamashita, Kazuki Sawa, Hiroko Yamamoto
  • Patent number: 8138674
    Abstract: A plasma display panel has heights of barrier ribs prevented from abnormally increasing at positions where a phosphor dispensing process starts and ends, improving discharge performance and uniformity of a panel. A front substrate and a rear substrate face each other. Address electrodes and display electrodes extend separately from each other in a first direction and a second direction, respectively, in a space between the front substrate and the rear substrate, the first direction crossing the second direction. Barrier ribs partition a display area including a plurality of discharge cells in the space between the front substrate and the rear substrate. A non-display area is formed along a periphery of the display area. A phosphor layer is formed in each discharge cell. The non-display area includes a buffer area formed of at least a single region outside the display area.
    Type: Grant
    Filed: January 6, 2010
    Date of Patent: March 20, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Seong-Hoon Han
  • Patent number: 8138993
    Abstract: The control of a plasma display panel, successively comprises, at least for all the cells of a current line having to switch state for the next line: a connection of a terminal of application of an intermediary supply voltage to output terminals of column control stages corresponding to the junction points of first and second switches between two terminals of application of a supply voltage, to perform a precharge or a predischarge of the screen cells; a disconnection of said output terminals from this intermediary voltage; and a connection of each output terminal to a first or to a second power supply voltage by the turning-on of the first or second switch of the corresponding stage, according to a luminance reference value, delayed with respect to the disconnection of the corresponding output terminal from the terminal of application of the intermediary voltage.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: March 20, 2012
    Assignee: STMicroelectronics SA
    Inventors: Jerome Bourgoin, Gilles Troussel
  • Patent number: 8138994
    Abstract: In a plasma display, an address buffer board converts subfield data, transmitted by a differential method, into a driving voltage using a control signal transmitted by a Transistor-Transistor Logic (TTL) method and a clock signal, transmitted by a differential method, and supplies the driving voltage to an address electrode. The signal transmitted by the TTL method passes through a buffer, and the buffer has a delay value that varies depending on temperature. A controller delays a clock signal corresponding to delay value of the buffer, and generates a control signal from the delayed clock signal. In addition, the controller converts the generated control signal into a control signal of the TTL method and outputs the converted control signal to the address buffer board.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: March 20, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jin-Won Nam
  • Patent number: 8134549
    Abstract: An image processing apparatus and a method to reduce power consumption of a self-luminous display. The image processing apparatus includes a parameter selection unit to select a parameter to adjust a degree to which power consumption is reduced; a scale factor setting unit to extract a high-frequency component of a current pixel in an input image and to set a scale factor according to the selected parameter and a size of the extracted high-frequency component; and a multiplier to multiply the current pixel by the set scale factor and to output a result of the multiplication.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: March 13, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Young-ran Han, Ho-young Lee, Du-sik Park
  • Publication number: 20120050253
    Abstract: An unnecessary discharge caused in the discharge cells in an initializing operation is prevented. This reduces the luminance of black level in a display image and stabilizes the address discharge at the same time, thus enhancing the image display quality. A plasma display panel that has a plurality of discharge cells having data electrodes and display electrode pairs, each formed of a scan electrode and a sustain electrode, is driven for gradation display such that a plurality of subfields is set in one field and each of the subfields has an initializing period, an address period, and a sustain period. For the above purpose, in the driving method for the plasma display panel, the following operations are performed. In the address period of a predetermined subfield, after the application of a scan pulse to all the scan electrodes is completed, a ramp voltage gently falling from a first voltage is applied to the sustain electrodes.
    Type: Application
    Filed: May 13, 2010
    Publication date: March 1, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Yuichi Sakai, Kenji Ogawa, Yutaka Yoshihama, Keiji Akamatsu
  • Patent number: RE43267
    Abstract: When performing the line-sequential addressing for setting the state of each of the cells arranged in rows and columns that constitute a display screen, discharge is generated that has intensity in accordance with display data corresponding to each of all cells belonging to the selected row for each selection of the row. Thus, the priming effect in the following discharge is generated.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE43268
    Abstract: When performing the line-sequential addressing for setting the state of each of the cells arranged in rows and columns that constitute a display screen, discharge is generated that has intensity in accordance with display data corresponding to each of all cells belonging to the selected row for each selection of the row. Thus, the priming effect in the following discharge is generated.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa
  • Patent number: RE43269
    Abstract: When performing the line-sequential addressing for setting the state of each of the cells arranged in rows and columns that constitute a display screen, discharge is generated that has intensity in accordance with display data corresponding to each of all cells belonging to the selected row for each selection of the row. Thus, the priming effect in the following discharge is generated.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Yasunobu Hashimoto, Yasushi Yoneda, Kenji Awamoto, Seiichi Iwasa