Fluid Light Emitter (e.g., Gas, Liquid, Or Plasma) Patents (Class 345/60)
  • Publication number: 20120280954
    Abstract: Stable address discharge is caused even in a plasma display panel where the definition is enhanced and the screen is enlarged. For this purpose, in a driving method of a plasma display panel, the image display region of the panel is divided into a plurality of partial display regions each of which includes a plurality of consecutively arranged scan electrodes. In each partial display region, a sequential address operation of sequentially applying scan pulses to the scan electrodes based on the arranging sequence of the scan electrodes on the panel is performed in the address period. To the scan electrode to which a scan pulse is to be firstly applied in the address period, a scan pulse of which the pulse width is set longer than that of the scan pulse to be applied to the other scan electrodes is applied.
    Type: Application
    Filed: January 19, 2011
    Publication date: November 8, 2012
    Inventors: Naoyuki Tomioka, Takahiko Origuchi, Hidehiko Shoji
  • Publication number: 20120281029
    Abstract: The plasma display apparatus suppresses addressing failure, enhancing stability of address discharge, and therefore, enhancing quality of display image on the panel. The present invention attains above through the followings: preparing display combination sets each of which having difference in number of combinations; determining whether or not magnitude of image signals, except for a predetermined color image signal, is greater than a threshold; and according to the determination above, selecting a set for the predetermined color image signal from the display combination sets. A display combination set used for the predetermined color image signal when the image signals except for the predetermined color image signal have magnitude not less than the threshold is smaller in number of combinations than that used for the predetermined color image signal when the image signals except for the predetermined color image signal have magnitude smaller than the threshold.
    Type: Application
    Filed: January 19, 2011
    Publication date: November 8, 2012
    Inventors: Takahiko Origuchi, Hirofumi Honda, Hidehiko Shoji, Naoyuki Tomioka, Kazuhiro Kanai
  • Publication number: 20120280963
    Abstract: The present invention allows a plasma display apparatus having a high-luminance panel to decrease initializing bright points that easily occur just after power-on of the apparatus, enhancing the quality of display image. The panel has discharge cells, each of which including a data electrode, and a display electrode pair formed of a scan electrode and a sustain electrode. In the driving method of the panel, one field period is formed of subfields, each of which including an initializing period for generating initializing discharge in the discharge cells, an address period for applying scan pulses to the scan electrodes and applying address pulses to the data electrodes, and a sustain period for applying sustain pulses to the data electrode pairs. In the structure above, a predetermined period after power-off of the apparatus has no generation of the address pulses, the scan pulses, and the sustain pulses.
    Type: Application
    Filed: January 19, 2011
    Publication date: November 8, 2012
    Inventors: Keiji Akamatsu, Yuichi Sakai, Minoru Takeda, Hidehiko Shoji, Naoyuki Tomioka
  • Patent number: 8305299
    Abstract: There is provided a plasma display device using a driving device for supplying driving signals to a plasma display panel (PDP). In a sustain falling period that at least partially overlaps the rising period of reset signals supplied to scan electrodes formed on the PDP, a voltage supplied to sustain electrodes is gradually reduced and a positive polar voltage is supplied to address electrodes. In driving the PDP, gradually falling signals are supplied to the sustain electrodes in the rising period of the reset signals so that the driving margin of the PDP can be secured. The positive polar voltage is supplied to the address electrodes so that initialization discharge can be stably performed and that the erroneous discharge of the plasma display device can be reduced.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: November 6, 2012
    Assignee: LG Electronics Inc.
    Inventors: Sung Kwang Cho, Yun Kwon Jung, Kyung Ryeol Shim, Yang Ki An
  • Patent number: 8305402
    Abstract: A plasma display device is provided. The plasma display device includes a plasma display panel (PDP) having an upper substrate, a lower substrate, a plurality of scan electrodes and a plurality of sustain electrodes formed on the upper substrate, and a plurality of address electrodes formed on the lower substrate; and a driver applying driving signals to the plurality of electrodes, wherein a reset discharge occurs in a part of discharge cells. The plasma display device can contribute to the reduction of dark-area luminance and the improvement of dark-room contrast ratio.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: November 6, 2012
    Assignee: LG Electronics Inc.
    Inventors: Moon Shick Chung, Choon Sub Kim, Dong Hyuk Park
  • Patent number: 8305300
    Abstract: The method for driving a plasma display panel effects control of the sub-fields in a manner that at least one sub-filed carries out, in its initializing period, an all-cell initializing operation on the discharge cells and the plurality of sub-fields other than the aforementioned sub-field selectively carry out an addressing operation in each discharge cell; at the same time, two or more predetermined sub-fields carry out an addressing operation only when at least one sub-field had an addressing operation after the all-cells initializing operation; and an unusual-charge erase period, where scan electrodes SC-SCn undergo application of voltage with a rectangular waveform, is provided after the initializing period of at least one sub-field of the predetermined sub-fields.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: November 6, 2012
    Assignee: Panasonic Corporation
    Inventors: Kunihiro Mima, Kosuke Makino, Tooru Kawase
  • Patent number: 8305292
    Abstract: A large-scale display device having a plurality of display units which each include a plurality of elongated plasma tubes each filled with a discharge gas, and at least one pair of display electrodes disposed outside the plasma tubes, voltage applying means which applies a drive voltage to the display electrodes to cause electric discharge in the plasma tubes for display. Vertically adjoining ones of the display units respectively have adjoining portions which are offset thicknesswise from each other for prevention of contact between the plasma tubes of the vertically adjoining display units. The voltage applying means is disposed away from the adjoining portions of the vertically adjoining display units.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: November 6, 2012
    Assignee: Shinoda Plasma Corporation
    Inventors: Hiroaki Tamura, Hitoshi Hirakawa, Koji Shinohe, Yoshio Shibukawa, Takamitsu Bunno, Tetsuya Makino, Kenji Awamoto, Yoko Shinoda
  • Patent number: 8305298
    Abstract: A plasma display apparatus and method of driving the plasma display apparatus are described. The plasma display apparatus has a plasma display panel that has a first electrode, a second electrode, and a third electrode. The plasma display apparatus also includes a first driver, a second driver and a third driver. The first driver supplies to the first electrode a first signal that decreases gradually from a first voltage to a second voltage during a setdown period of a reset period. The third driver supplies to the third electrode a third signal that increases from a third voltage to a fourth voltage during the setdown period of the reset period.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: November 6, 2012
    Assignee: LG Electronics Inc.
    Inventors: Gun Su Kim, Yong Song
  • Patent number: 8305301
    Abstract: Visual artifact reduction method for a display comprising the use of gamma correction. Other artifact reduction methods can be used with gamma corrections including error diffusion, dithering, and center of light.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: November 6, 2012
    Assignee: Imaging Systems Technology
    Inventors: Carol Ann Wedding, Jeffrey W. Guy
  • Patent number: 8299981
    Abstract: The driving method of the plasma display device has a plurality of combination sets for display that includes a different number of combinations. The signal levels of a red image signal, a green image signal, and a blue image signal are compared with each other. For an image signal of a color that has a low signal level, a combination set for display is used where the number of combinations is smaller than that in the combination set for display used for an image signal of a color that has a high signal level.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: October 30, 2012
    Assignee: Panasonic Corporation
    Inventor: Kazuhiro Yamada
  • Patent number: 8294951
    Abstract: A method of reducing the amount of black in an image is disclosed. The method is using a computer to reduce the amount of or eliminate the black in an original digital image. The major procedure is to increase the pixels of the original digital image (by four or nine times) and then change the color information of the pixels.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: October 23, 2012
    Inventors: Kuan-Li Chao, Chun-Chieh Huang, Kun-Yi Hua, Mardianto Soebagio Hadiputro, Hwa-Pey Wang, Chih-Kang Yang, Kuo-Ping Yang, Sin-Chen Lin
  • Patent number: 8295992
    Abstract: The present invention is directed to a remote control system for controlling a railway vehicle. The remote control system including a remote control device for transmitting signals to a first controller module. The first controller is mounted to the railway vehicle and controls and monitors the functions of the railway vehicle. The first controller module also relays information to the remote control device. The remote control system can also include a portable safety switch allowing any individual in proximity to the railway vehicle to send a stop signal to the first controller module to stop the railway vehicle if any unsafe conditions exist.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: October 23, 2012
    Assignee: Hetronic International, Inc.
    Inventors: Mark Ecton, Torsten Rempe, Max Heckl
  • Patent number: 8294635
    Abstract: A stable address discharge is generated and number of unlit cells is decreased without heightening the voltage necessary for generating an address discharge. For this purpose, the device includes a plasma display panel and a driving circuit for driving the plasma display panel, in which the driving circuit drives the plasma display panel having a sub-field group formed of two or more continuous sub-fields for controlling addressing provided in one field period, so as not to generate sustain discharge in the discharge cell not causing sustain discharge and also in the subsequent sub-fields, the discharge cell is initialized by applying a ramp waveform voltage descending gently to the scan electrode, the lowest voltage of the ramp waveform voltage of the sub-field included in the sub-field group is made different from the lowest voltage of the ramp waveform voltage of the sub-field not included in the sub-field group.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: October 23, 2012
    Assignee: Panasonic Corporation
    Inventors: Takahiko Origuchi, Hidehiko Shoji
  • Patent number: 8294634
    Abstract: Overheating while enabling a full flexibility in the display usage should be avoided. This object is solved by a method for avoiding the overheating of a driver circuit in a plasma display panel wherein the driver circuit receives serially display data in form of a sequence of sub-field data bits and forwards parallelly the display data in the form of data blocks each consisting of a predefined number of sub-field data bits, the method comprising the steps of counting sub-field data bits the value of which differs from that of a neighboring or preceding sub-field data bit and providing a respective counting signal indicative of heat contributions of sub-field data bits and, if said counting signal is above a pregiven threshold, taking countermeasures for reducing said temperature.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: October 23, 2012
    Assignee: Thomson Licensing
    Inventors: Sébastien Weitbruch, Cédric Thebault, Carlos Correa
  • Patent number: 8294636
    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 positive rectangular waveform voltage (Va) and a negative rectangular waveform voltage (Va) to the scan electrodes (SCN1 to SCNn) in a third period following the second period within the setup period. A data electrode driving circuit applies a positive rectangular waveform voltage (Vd) to data electrodes (D1 to Dm) in a period after application of the positive rectangular waveform voltage (Vs) to the scan electrodes (SCN to SCNn) and before application of the negative rectangular waveform voltage (Va) to the scan electrodes (SCN1 to SCNn) in the third period.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: October 23, 2012
    Assignee: Panasonic Corporation
    Inventors: Toshiyuki Maeda, Hidehiko Shoji
  • Publication number: 20120262391
    Abstract: A touch screen device includes a screen main body comprising a plurality of transmitting electrodes and a plurality of receiving electrodes and disposed in front of a plasma display panel; a transmitter sequentially selecting the transmitting electrodes and applying a drive signal to the selected transmitting electrodes; a receiver sequentially selecting the receiving electrodes, receiving a response signal output from each of the receiving electrodes in response to the drive signal, and outputting detection data at each electrode intersection; a discharge detector detecting discharge of each of the scanning electrodes of the plasma display panel; and a controller that obtains a touch position based on detection data of the discharge detector at each electrode intersection acquired from the response signals from the receiving electrodes positioned distant from the discharging scanning electrodes.
    Type: Application
    Filed: March 29, 2012
    Publication date: October 18, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Tadashi MAKI, Taichi YAMADA, Takashi KITADA
  • Patent number: 8290646
    Abstract: The present invention is directed to a remote control system for controlling a railway vehicle. The remote control system including a remote control device provided with haptic technology for transmitting signals to a first controller module. The first controller is mounted to the railway vehicle and controls and monitors the functions of the railway vehicle. The first controller module also relays information to the remote control device. The remote control system can also include a portable safety switch allowing any individual in proximity to the railway vehicle to send a stop signal to the first controller module to stop the railway vehicle if any unsafe conditions exist.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: October 16, 2012
    Assignee: Hetronic International, Inc.
    Inventors: Mark Ecton, Torsten Rempe
  • Patent number: 8289233
    Abstract: Visual artifact reduction method for a display comprising the use of error diffusion. Other artifact reduction methods can be used with error diffusion, including gamma correction, dithering, and center of light.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: October 16, 2012
    Assignee: Imaging Systems Technology
    Inventors: Jeffrey W. Guy, Carol Ann Wedding
  • Patent number: 8284218
    Abstract: A display device in which the image quality is improved by control of the peak luminance. A plurality of instantaneous luminances are expressed by performing signal writing to each pixel plural times within one frame period. The gray level is expressed by controlling time integration levels of the plurality of instantaneous luminances. Moreover, the time integration level is increased as the level of gray level data of the pixel is higher, and the time integration level is increased as the average value of gray level data of an image to be displayed is smaller.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: October 9, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Yasunori Yoshida
  • Publication number: 20120249500
    Abstract: An address period is shortened while degradation of image display quality of a plasma display apparatus is suppressed. For this purpose, in a driving method for a plasma display apparatus including a plasma display panel with a plurality of discharge cells having a scan electrode, a sustain electrode, and a data electrode, and a driver circuit, the following operation is performed. The driver circuit forms one field period by a subfield that displays an interlace signal as an image signal thinned out every one line and a subfield that displays oblique line interpolated data generated by interpolating oblique lines detected by an image signal. In the subfield displaying an image signal, the driver circuit performs two-line simultaneous address operation with application of a scan pulse simultaneously to two adjacent scan electrodes so as to generate an address discharge in a discharge cell.
    Type: Application
    Filed: December 14, 2010
    Publication date: October 4, 2012
    Inventors: Takahiko Origuchi, Yuya Shiozaki, Shigeo Kigo, Yutaka Yoshihama, Mitsuhiro Ishizuka
  • Patent number: 8279142
    Abstract: A display device (1) including a surface discharge type plasma display panel (2) performs an addressing operation, a sustain operation and a reset operation. In the addressing operation, address discharge of an opposed discharge form with the second electrode (Y) used as a cathode is generated between the second electrode (Y) and a third electrode (A) in a cell to be energized or in a cell not to be energized. In the reset operation, an obtuse wave pulse (Pr1) having a negative polarity is applied to the second electrode (Y) so as to generate charge adjustment discharge starting from discharge of the opposed discharge form with the second electrode (Y) used as a cathode between the second electrode (Y) and the third electrode (A).
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: October 2, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiho Seo, Koichi Sakita, Tadayoshi Kosaka, Hajime Inoue, Kazushige Takagi
  • Publication number: 20120242721
    Abstract: A loading phenomenon in a plasma display panel is reduced and the image display quality is improved. For this purpose, image signal processing circuit (41) includes a number-of-lit-cells calculating section (60) for calculating the number of lit cells, load value calculating section (61) for calculating the load value in each discharge cell based on the calculation result by number-of-lit-cells calculating section (60), correction gain calculating section (62) for calculating the correction gain of each discharge cell based on the calculation result by load value calculating section (61), pattern detecting section (63) for determining the presence or the absence of occurrence of a loading phenomenon in a display image, selecting circuit (64) as a correction gain changing section for changing the correction gain based on the determination result by pattern detecting section (63), and correcting section (69) for correcting an image signal based on the correction gain after the change.
    Type: Application
    Filed: December 7, 2010
    Publication date: September 27, 2012
    Applicant: Panasonic Corporation
    Inventor: Tomoyuki Saito
  • Publication number: 20120242631
    Abstract: A loading phenomenon in a plasma display panel is reduced.
    Type: Application
    Filed: December 9, 2010
    Publication date: September 27, 2012
    Inventors: Kazuki Sawa, Tomoyuki Saito
  • Publication number: 20120242720
    Abstract: A loading phenomenon in a plasma display panel is reduced so as to enhance image display quality. For this purpose, a plasma display apparatus includes a plasma display panel and an image signal processing circuit (41). The image signal processing circuit (41) includes the number of lit cells calculator (60) for calculating the number of lit cells, a load value calculator (61) for calculating the load value of each discharge cell based on the calculation result by the number of lit cells calculator (60), a correction gain calculator (62) for calculating the correction gain of each discharge cell based on the calculation result by the load value calculator (61), a correction gain adjustor (64) for smoothing the correction gain in response to an image signal, and a corrector (69) for correcting the image signal based on the adjusted correction gain.
    Type: Application
    Filed: December 15, 2010
    Publication date: September 27, 2012
    Inventor: Tomoyuki Saito
  • Patent number: 8274450
    Abstract: A discharge sustain driver circuit for a plasma display device, the driver circuit comprising a first transistor switching circuit for switching a DC bus voltage across the plasma display device; a storage capacitance; at least one inductor; and first and second bi-directional switching circuits coupled in series and being coupled to the first switching circuit to transfer charge from the plasma display device through the at least one inductor to the storage capacitance, and back to the plasma display device; and a controller for the bi-directional switching circuits to control the bi-directional switching circuits so as to receive the charge on the storage capacitance and return the charge in an opposite charge direction to the plasma display device.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: September 25, 2012
    Assignee: International Rectifier Corporation
    Inventor: Edgar Abdoulin
  • Patent number: 8269693
    Abstract: In a PDP device, a technique capable of more efficiently performing address energy control according to contents of a display image (display data) to reduce the address energy. In the PDP device, as an address energy recovery circuit, a plurality of address energy control circuits (B1 to Bn) are provided corresponding to a plurality (n) of regions (H1 to Hn) into which a screen area (R) and a group of address electrodes are divided in a horizontal direction. For each of the regions (H) of which the address energy recovery circuits (B) are respectively in charge and for each of subfields, an address pulse switching load (Q) corresponding to that region (H) is determined, and then, according to the magnitude of the load (Q), the operation of the address energy recovery circuit (B) is ON/OFF-controlled.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: September 18, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Akihiro Takagi, Tetsuya Sakamoto, Takayuki Kobayashi, Takashi Sasaki, Akira Otsuka
  • Patent number: 8269419
    Abstract: A plasma display panel equipped with a front substrate and a back substrate facing each other to form a discharge space. On the discharge space side of the front substrate there are disposed a metal oxide layer and magnesium oxide crystal particles. An area ratio of the magnesium oxide crystal particles to the metal oxide layer is 0.1% to 85%.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: September 18, 2012
    Assignee: Panasonic Corporation
    Inventors: Taro Naoi, Hai Lin, Eishiro Otani, Hiroshi Ito
  • Publication number: 20120229434
    Abstract: In a plasma display apparatus, a stable address discharge is caused while unnecessary radiation, e.g. line radiation and housing radiation, is suppressed. For this purpose, the plasma display apparatus includes an image signal processing circuit and a data electrode driver circuit. The data electrode driver circuit generates an address pulse based on the image data, and applies the address pulse to a data electrode, using at least one output buffer having a predetermined current supply capability for applying the address pulse to the data electrode. Further, based on the image data, the data electrode driver circuit calculates the load capacitance of the data electrode. Based on the calculated load capacitance, the data electrode driver circuit changes the number of the output buffers to be used in the application of the address pulse to the data electrode.
    Type: Application
    Filed: November 11, 2010
    Publication date: September 13, 2012
    Inventor: Yoshimasa Niibo
  • Publication number: 20120223923
    Abstract: A plasma display apparatus causes a stable address discharge while suppressing unnecessary radiation, e.g. line radiation and housing radiation. For this purpose, the plasma display apparatus includes an image signal processing circuit, a data electrode driver circuit, and a timing generation circuit. The data electrode driver circuit generates an address pulse based on the image data at the timing in synchronization with an address timing signal from the timing generation circuit. The data electrode driver circuit has a delay part for delaying the address timing signal, calculates the load capacitance of each data electrode based on the image data. Further, based on the load capacitance calculated for each data electrode, the data electrode driver circuit generates an address pulse at the timing in synchronization with either the address timing signal before the delay in the delay part or an address timing signal delayed by the delay part.
    Type: Application
    Filed: November 11, 2010
    Publication date: September 6, 2012
    Inventor: Yoshimasa Niibo
  • Patent number: 8259037
    Abstract: A plasma display and a driving apparatus thereof with an improved energy recovery circuit configured to reduce resonances between a plurality of capacitors. Accordingly to an embodiment of the present invention, a plasma display has an energy recovery circuit that includes an energy recovery capacitor. The energy recovery circuit is configured to form a first path between the energy recovery capacitor and a display electrode to change a voltage at the display electrode in a sustain period. The energy recovery capacitor includes a plurality of capacitors configured to be charged concurrently, and the energy recovery circuit is configured to form a second path between the plurality of capacitors. A product of an inductance formed on the second path and a capacitance formed on the second path is greater than twice a product of an inductance formed on the first path and a capacitance formed on the first path.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: September 4, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jin-Ho Yang, Hyung-Jun An
  • Patent number: 8259036
    Abstract: A plasma display apparatus is disclosed. The plasma display apparatus includes a plasma display panel and a filter positioned in front of the plasma display panel. The plasma display panel includes a front substrate on which an upper dielectric layer is positioned, first and second electrodes positioned between the front substrate and the upper dielectric layer, and a rear substrate on which a third electrode is positioned to intersect the first and second electrodes. The filter includes a first portion having a first degree of blackness, and a second portion that is positioned in the first portion and has a second degree of blackness larger than the first degree of blackness. A black layer is omitted between the front substrate and the upper dielectric layer.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: September 4, 2012
    Assignee: LG Electronics Inc.
    Inventors: Seongnam Ryu, Woogon Jeon, Wootae Kim, Kyunga Kang, Jeonghyun Hamh, Jaesung Kim
  • Patent number: 8253656
    Abstract: A plasma display apparatus and a method of driving the same are disclosed. The plasma display apparatus includes a plasma display panel including scan electrodes and sustain electrodes, a sensor unit for detecting a temperature or a peripheral temperature of the panel, and a scan driver for supplying reset signals to the scan electrodes in a reset period of at least one subfield among a plurality of subfields at a predetermined reference temperature so that a first period in which a lowest voltage of the reset signal is supplied is different from a supply period of a lowest voltage when the temperature or the peripheral temperature of the PDP deviates the predetermined reference temperature.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: August 28, 2012
    Assignee: LG Electronics Inc.
    Inventors: Kirack Park, Jongwoon Bae, Seonghwan Ryu
  • Patent number: 8253657
    Abstract: A driving apparatus of a plasma display is disclosed. The apparatus includes a first switch connected between a first power source for supplying a first voltage and a scan electrode, and a first diode and a second switch connected in series between a second power source for supplying a second voltage that is higher than the first voltage and the scan electrode. Further, the driving apparatus includes a third switch connected between a power recovery power source and a contact point between the first diode and the second switch, and a second diode connected in parallel the first diode and the third switch.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: August 28, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Kyong-Pil Jin, Yoo-Jin Song
  • Publication number: 20120212464
    Abstract: With the objective of achieving increased luminous efficiency while suppressing a rise in discharge voltage in a high-definition PDP, a PDP is configured with ribs at intervals between a front plate and a back plate, the ribs partitioning a gap between the front plate and the back plate into spaces. Each space constitutes a discharge cell. A minimum width of a discharge space in the discharge cell is in a range from 65 ?m to 100 ?m at a position adjacent to a pair of discharge electrodes. A ternary discharge gas of xenon, neon, and helium is enclosed in the discharge space. The partial pressure ratio of xenon in the discharge gas is in a range of 15% to 25%, and the partial pressure ratio of helium is in a range of 20% to 50%. The total pressure of the discharge gas is set between 60 kPa and 70 kPa.
    Type: Application
    Filed: March 16, 2011
    Publication date: August 23, 2012
    Inventor: Kiyoshi Hashimotodani
  • Patent number: 8248327
    Abstract: A scan IC includes a switch circuit and a logic circuit. The switch circuit includes first and second transistors and a level shift circuit. First and second control signals that change between a logical “1” and a logical “0” are applied to an input terminal of the logic circuit. The logic circuit applies a third control signal to the first transistor and applies a fourth control signal to the second transistor based on the applied first and second control signals. A detection circuit is connected to the input terminal of the logic circuit. An abnormality of the scan IC is detected by the detection circuit.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: August 21, 2012
    Assignee: Panasonic Corporation
    Inventors: Masaaki Kuranuki, Tosikazu Nagaki, Manabu Inoue, Tomohisa Sakaguchi, Kazuo Oohira
  • Patent number: 8248328
    Abstract: Visual artifact reduction methods for a display including gamma corrections, error diffusion and/or dithering. The invention is described with reference to an AC gas discharge display (PDP) comprising a multiplicity of plasma-shells, but may be practiced with other display technologies. The methods of this invention are disclosed for use with a number of PDP structures and PDP electronic addressing architectures including ADS, AWD, SAS, and ALIS.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: August 21, 2012
    Assignee: Imaging Systems Technology
    Inventors: Carol Ann Wedding, Jeffrey W. Guy, Daniel K. Wedding, Oliver M. Strbik, III
  • Publication number: 20120206320
    Abstract: The present invention relates to a display apparatus comprising front display unit (10), and rear display unit (50) arranged behind the front display unit (10).
    Type: Application
    Filed: October 6, 2010
    Publication date: August 16, 2012
    Inventors: Kyoung Chan Lee, Chan Hwan Kim, Gun Ho Lee
  • Patent number: 8242977
    Abstract: This invention is directed to a technique capable of achieving image quality improvement by the control of reset thinning drive (second drive) in a PDP drive control and of restricting or reducing the generation of hunting in ON/OFF control of the second drive and flickering of background luminance particularly in the case of low-luminance display. In this PDP apparatus, in addition to the control of the second drive using the SF load ratio, the APL value (k) and APL variation value (q) of the field are used, and when the APL variation value (q) is less than a predetermined threshold value, even when the SF load ratio is changed from zero to a value other than zero between SFs, the execution of the first drive is not started, and the execution of the second drive is continued.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: August 14, 2012
    Assignee: Hitachi, Ltd.
    Inventor: Hirohito Kuriyama
  • Patent number: 8242976
    Abstract: In a display driving device which performs scan driving of a PDP or similar, to enable rapid scan operation, reduction of the chip size, and lowering of costs, as well as elimination of coupling problems. The display driving device is provided with a pull-up switching element Nu connected to a first driving voltage (VDH) supply line and common to all bits; diodes D1 to DN for each bit, connected between the pull-up switching element Nu and driving voltage output terminals for each bit; pull-down switching elements Nd1 to NdN for each bit, connected between a second driving voltage (GND) supply line and the driving voltage output terminals for each bit; and resistance elements R1 to RN for each bit, connected between the first driving voltage supply line and the pull-down switching elements Nd1 to NdN.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: August 14, 2012
    Assignees: Fuji Electric Systems Co., Ltd., L.G. Electronics, Inc.
    Inventors: Kazuhiro Matsunami, Hideto Kobayashi, Makoto Tanaka
  • Patent number: 8242978
    Abstract: A PDP apparatus having a driving circuit in which a circuit for applying a rising-slope waveform in a reset period, a circuit for applying a falling-slope waveform, and a clamp circuit for generating a falling waveform having a dulled waveform between the rising-slope waveform and the falling-slope waveform are comprised. The clamp circuit comprises a bidirectional switch having two FETs, and a gate feedback circuit is connected to a gate portion of the FET at a panel side. The PDP apparatus reduces a current noise occurring in a sustain electrode throughout the panel when switching the rising-slope waveform and the falling-slope waveform, thereby solving problems such as an increase of unnecessary radiation and stress on elements such as FETs on the path.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: August 14, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Yuichiro Mahara, Akihiro Machida, Teruo Okamura, Sojiro Hagihara
  • Publication number: 20120200547
    Abstract: According to an exemplary embodiment, a driver circuit for generating a reset pulse of an output waveform includes a plurality of ramp paths, each ramp path being configured to control the slope of the reset pulse. The driver circuit also includes a falling switch configured to selectively hold the output waveform low. The driver circuit further includes a switch controller for selectively enabling the plurality of ramp paths and the falling switch to generate the reset pulse. The switch controller can selectively enable the plurality of ramp paths responsive to a reference setting signal to select the slope of the reset pulse. The driver circuit can also generate a sustain pulse. The driver circuit is can generate the reset pulse and the sustain pulse by driving a transistor.
    Type: Application
    Filed: February 7, 2011
    Publication date: August 9, 2012
    Applicant: INTERNATIONAL RECTIFIER CORPORATION
    Inventor: Dong Young Lee
  • Publication number: 20120200564
    Abstract: A high-quality stereoscopic image is displayed by suppressing crosstalk between an image for the right eye and an image for the left eye and stabilizing an address discharge. For this purpose, in the method for driving the plasma display apparatus, an image for the right eye and an image for the left eye are alternately displayed on the plasma display panel by alternately repeating a field for the right eye and a field for the left eye. In each of the field for the right eye and the field for the left eye, the subfield having the smallest luminance weight is placed first, the subfield having the largest luminance weight is placed next, and the other subfields are placed thereafter so as to have luminance weights sequentially decreasing.
    Type: Application
    Filed: October 13, 2010
    Publication date: August 9, 2012
    Inventors: Takahiko Origuchi, Yuya Shiozaki, Shigeo Kigo, Hidehiko Shoji, Mitsuhiro Ishizuka
  • Publication number: 20120200543
    Abstract: It is an object to provide a driving method of a plasma display panel, whereby a dark contrast can be improved while suppressing an erroneous discharge. In a resetting step in a first unit display period, while a first reset pulse having a predetermined peak electric potential is applied to one of first row electrodes of row electrode pairs formed in the PDP, a second reset pulse having a peak electric potential smaller than that of the first reset pulse is applied to the other of the first row electrodes. In the resetting step in a second unit display period subsequent to the first unit display period, a second reset pulse is applied to each of the one and the other of the first row electrodes.
    Type: Application
    Filed: April 17, 2012
    Publication date: August 9, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Kazuo YAHAGI, Mitsuhiro ISHIZUKA, Yuya SHIOZAKI, Shunsuke ITAKURA, Kazuhiro KANAI, Hajime HOMMA, Yoshichika SATO, Hikaru TAKAHASHI
  • Patent number: 8237629
    Abstract: Disclosed is a method of driving a plasma display panel. In this method, one field corresponding to one image is divided into a plurality of sub-fields, and at least one second sub-field is arranged after a first sub-field. In the first sub-field, the method comprises a first step of forming wall charges with negative polarity near the scanning electrode and forming wall charges with positive polarity near the common electrode and the data electrode; a second step of adjusting an amount of the wall charges with negative polarity near the scanning electrode and an amount of the wall charges with positive polarity near the common electrode and the data electrode; a third step of generating a writing discharge in a selected display cell of the display cells; a fourth step of generating light emission for display; and a fifth step of erasing a part of the wall charges in the display cell which emits light in the fourth step.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: August 7, 2012
    Assignee: Panasonic Corporation
    Inventors: Hajime Homma, Mitsuhiro Ishizuka, Shinji Hirakawa, Shinya Tsuchida, Koji Hashimoto
  • Patent number: 8232983
    Abstract: In the method for driving a plasma display panel and the plasma display device, the scan electrodes of the plasma display panel are divided into two scan electrode groups, the address period of subfields is divided into two address periods corresponding to the two scan electrode groups, and at least in one address period, the scan electrodes belonging to the scan electrode group provided with scan pulses are sequentially provided with scan pulses shifting from second voltage higher than scan pulse voltage to scan pulse voltage and shifting again to second voltage, and the scan electrodes belonging to the scan electrode group not provided with scan pulses are provided with either third voltage higher than scan pulse voltage or fourth voltage higher than second voltage and third voltage, and with third voltage at least while scan pulse voltage is applied to adjacent scan electrodes.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: July 31, 2012
    Assignee: Panasonic Corporation
    Inventors: Kenji Ogawa, Keiji Akamatsu, Yasuhiro Arai
  • Patent number: 8228316
    Abstract: There is provided a video signal processing apparatus including motion picture region detecting, transition region generating unit, still level delay unit which delays the output from the transition region generating unit for output, addition unit which adds an error diffused from neighboring pixels to a video signal, still image processing unit which performs a still image process on a video signal, motion picture processing unit which performs a motion picture process on a video signal, selection unit which outputs a video signal on which the still image process has been performed or a video signal on which the motion picture process has been performed, subtraction unit which calculates a difference between an input video signal and an output video signal, multiplication unit which multiplies an error by a predetermined constant, and a delay unit which delays the error and diffuses the error to neighboring pixels.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: July 24, 2012
    Assignee: Panasonic Corporation
    Inventor: Kazuhiro Yamada
  • Patent number: 8223090
    Abstract: A plasma display device is disclosed. The device includes a plasma display panel including an address electrode, first and second display electrodes crossing the address electrode, a dielectric layer covering the display electrodes, and an MgO protective layer covering the dielectric layer. The device also includes a driver configured to generate a sustain pulse width of 1 to 3.5 ?s, and a statistical delay time (Ts) depending on temperature is represented by the following Formula 1: y=A×e?kx??(Formula 1), wherein k is a constant, x is 1/temperature, y is 1/Ts, and A is a constant. The MgO protective layer may be formed by MgO deposition in which water vapor partial pressure is in a range of from 2×10?7 to 6×10?7 Torr·l/s. The temperature dependency of the discharge characteristics is reduced, response speed is improved, and the discharge stability is improved.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: July 17, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Ki-Dong Kim
  • Patent number: 8223092
    Abstract: A plasma display device driven during an address period and a sustain period includes a discharge cell defined by a scan electrode, a sustain electrode, and an address electrode, an addressing circuit for providing an address voltage to the address electrode, and an addressing compensation circuit for storing voltage corresponding to a displacement current generated during a sustain period to be utilized during the address period. The addressing compensation circuit includes a switch coupled with the address electrode through which the displacement current supplied from the scan electrode and the sustain electrode is received during the sustain period, and a capacitor coupled with the switch for storing the voltage corresponding to the displacement current received through the switch.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: July 17, 2012
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Sang-Gu Lee
  • Patent number: 8222814
    Abstract: The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layer 8 is composed of an MgO film layer 81 and an MgO particle layer 82 that is made of MgO particles 16. The MgO particles 16 are formed by burning an MgO precursor and satisfy that a/b?1.2, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 650 nm to 900 nm, exclusive of 900 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: July 17, 2012
    Assignee: Panasonic Corporation
    Inventors: Masaharu Terauchi, Yusuke Fukui, Takuji Tsujita, Michiko Okafuji, Mikihiko Nishitani
  • Patent number: 8213071
    Abstract: Display device is based on layer break up or layer displacement having at least two different states, in which one of the fluids, e.g., oil in a first state, adjoins at least a first support plate and, in the second state, the other fluid at least partly adjoins the first support plate. In one embodiment, a picture element corresponds to a substantially closed space and, in the first state, the other fluid layer substantially completely adjoins both support plates and is divided in two sub-layers. This makes it possible, on the one hand, to use lower voltages to make displacement occur. On the other hand, this opens the opportunity to color displays.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: July 3, 2012
    Assignee: Samsung LCD Netherlands R & D Center B.V.
    Inventors: Bokke Johannes Feenstra, Robert Andrew Hayes, Menno Willem Jose Prins