Field Emissive (e.g., Fed, Spindt, Microtip, Etc.) Patents (Class 345/75.2)
  • Patent number: 7221336
    Abstract: An aging driving method of a field emission display device can secure long lifetimes of panel by reducing possibilities of generation of arcing, by largely increasing energy distribution under a low voltage, and by applying a pulse voltage which is varied to reduce energy distribution under a high voltage as time goes, in aging processing. In addition, aging is performed in a very short time by using small energy in a pulse supply, thereby preventing a damage of a panel and much shortening an aging time. In addition, aging is performed in each pre-aging process and a main-aging process, to reduce contaminants, thereby lengthening lifetimes of a panel and securing reliability of a product.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: May 22, 2007
    Assignee: LG Electronics Inc.
    Inventor: Seong-Hak Moon
  • Patent number: 7218058
    Abstract: A cold cathode type flat panel display which is an image display device including a vacuum panel container composed of a cathode substrate in which plural cold cathode type electron sources are arranged, an anode substrate, plural spacers for supporting the cathode substrate and the anode substrate, and a glass frame. Plural electrical lines extend in a line direction and a row direction across an interlayer insulator on the cathode substrate. Parts of lines positioned in an upper layer of the plural electrical lines are made into scan lines and lines positioned in a lower layer are made into data lines. Further, parts of the electrical lines positioned in the upper layer are made into ground lines for giving ground voltage to the spacers.
    Type: Grant
    Filed: March 11, 2005
    Date of Patent: May 15, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Masakazu Sagawa, Toshiaki Kusunoki, Mutsumi Suzuki, Nobuaki Kabuto
  • Patent number: 7190334
    Abstract: The object of the present invention is to provide a driving method and a driving apparatus for a field emission device that controls emission current with stability regardless of how long the device is driven. The field emission device driving method and driving apparatus of the present invention set the actual emission current at a reference level by adjusting the amount of current which is supplied to the emitter to a reference level. The amount of current supplied to the emitter is adjusted to the reference level by increasing the driving voltage in response to driving time elapsing in a state in which the electron emission performance is sustained above the reference level.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: March 13, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toru Kawase, Keisuke Koga
  • Patent number: 7180514
    Abstract: An image display apparatus includes a display panel having an electron source, an acceleration electrode for accelerating electrons emitted from the electron source and phosphors for emitting light by collision of electrons accelerated by the acceleration electrode, and a detector for detecting a current flowing through the acceleration electrode during a non-display period. In addition, a controller is provided to decrease the luminance level, stop display driving or transmit warning information when the current detected becomes more than a predetermined value.
    Type: Grant
    Filed: September 16, 2003
    Date of Patent: February 20, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsutoshi Kuno, Osamu Sagano, Akira Fujii
  • Patent number: 7176614
    Abstract: A flat panel display device includes a first substrate, an electron emission assembly formed on the first substrate, a second substrate provided at a predetermined distance from the first substrate and forming a vacuum assembly with the first substrate, and an illumination assembly formed on the second substrate, the illumination assembly being illuminated by electrons emitted from the electron emission assembly. The illumination assembly includes at least one anode electrode formed on a surface of the second substrate facing the first substrate, phosphor layers formed in a predetermined pattern on the at least one anode electrode, and conductive layers formed of a carbon-based material on the phosphor layers.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: February 13, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Soo-Joung Lee, Hun-Young Kim
  • Patent number: 7176877
    Abstract: A high voltage driver with capacitive coupling that is useful in the presence of the high power supply ripple common with higher-voltage systems. It permits extreme ranges of duty cycle, but without the limitations of transformer magnetics, or the increased complexity of optical coupling methods. It is also robust in the presence of voltage transients created by high-voltage arcing to the output drive-line.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: February 13, 2007
    Assignee: Nano-Proprietary, Inc.
    Inventors: Alexei Tikhonski, Thomas A. Visel
  • Patent number: 7161290
    Abstract: An envelope includes a first substrate having an image display surface, and a second substrate opposing the first substrate with a space therebetween. Electron sources for activating the image display surface are arranged on the second substrate at a predetermined pixel pitch in an X-direction and a Y-direction perpendicular to each other. Spacers are provided between the first and second substrates. The spacers are arranged at several times the pixel pitch in the X-direction, and arranged in the Y-direction at the same pitch as the pixel pitch at least in a part of the image display surface, those of the spacers arranged in the Y-direction being arranged in line with the electron sources and being located at both sides of each of the corresponding electron sources to make an electron emitted from each of the corresponding electron sources pass between each adjacent pair of those spacers.
    Type: Grant
    Filed: August 19, 2004
    Date of Patent: January 9, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shigeo Takenaka, Masaru Nikaido, Sachiko Hirahara, Satoko Oyaizu
  • Patent number: 7158102
    Abstract: A field emission display (FED) having a correction system with a correction coefficient derived from emission current is presented. Within one embodiment in accordance with the present invention, a field emission display has an anode at the faceplate and a focus structure. The anode potential is held at ground while the focus structure potential is held between, but is not limited to, 40 and 50 volts. The current flowing to the focus structure is measured and used as the basis for the correction coefficient for the field emission display.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: January 2, 2007
    Assignees: Candescent Technologies Corporation, Sony Corporation
    Inventors: Ronald L. Hansen, James C. Dunphy, Christopher J. Spindt, James M. Cleeves, Jerome M. Truppa, Gregory M. Fink, Yukinobu Iguchi
  • Patent number: 7145528
    Abstract: In a display device and a driving and controlling method therefor, in order to restrain the occurrence of an unsatisfactory display state or unsatisfactory luminescence in the case where an anode potential is made to transition from a supply state to a cut-off state in response to the generation of a display completing signal, when a display signal DS is generated at time t0, an anode potential Va is raised at time t1, and at time t2 until which a predetermined time Td2 passes after the anode potential Va decreases below a threshold potential Vth with a cut-off voltage applied between cathodes and an anode, the application of the cut-off voltage is completed.
    Type: Grant
    Filed: November 20, 2003
    Date of Patent: December 5, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeki Yabu, Takeo Tsukamoto
  • Patent number: 7145527
    Abstract: A field emission display device is provided which includes data lines formed in a panel, scan lines formed in the direction crossing the data lines in the panel, a first connector installed at an end of the data lines and electrically connected with the data lines, a second connector installed at an end of the scan lines and electrically connected with the scan lines and a printed circuit board which is installed on the rear surface of the panel. The flat emission display device can display an image of a uniform brightness regardless of the position of the screen. Also, the flat emission display device can maintain the brightness of the whole screen uniformly by differently supplying the driving voltage and pulse width of the driving voltage which are supplied to the data driving unit according to the position of the data line, and compensating voltage descending caused by differences in the resistance according to the is position of the scan line by converting the input data value.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: December 5, 2006
    Assignee: LG Electronics Inc.
    Inventor: Seong Hak Moon
  • Patent number: 7142177
    Abstract: The present invention relates to an image display apparatus for forming an image with a plurality of luminescent spots to be precisely aligned in a matrix. For example, a spacer disposed between an electron source and a face plate causes luminescent spots on the face plate spaced unevenly. The luminescent spots spaced unevenly will produce a visual unevenness in luminance which deteriorates the quality of produced image. By modifying the quantity of light of luminescent spots spaced unevenly, the visual unevenness in luminance is compensated.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: November 28, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Izumi Kanai, Yukio Hiraki, Makiko Mori, Kohei Inamura, Masaru Tada, Toshiyuki Kanda, Tatsuro Yamazaki
  • Patent number: 7132304
    Abstract: A field emission device comprises a glass substrate, an emitter electrode formed on the glass substrate, a carbon nanotube (CNT) emitter formed on the emitter electrode, and a gate stack formed around the CNT emitter for extracting electron beams from the CNT emitter and focusing the extracted electron beams onto a given position. The gate stack includes a mask layer covering the emitter electrode and provided around the CNT emitter, a gate insulating layer formed on the mask layer to a predetermined height, a mirror electrode formed on an inclined plane of the gate insulating layer, a gate electrode formed on the gate insulating layer and spaced apart from the mirror electrode, and a focus gate insulating layer and a focus gate electrode sequentially formed on the gate electrode. The field emission device is manufactured and employed in a display device in accordance with the present invention.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: November 7, 2006
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jun-Hee Choi, Andrei Zoulkarneev
  • Patent number: 7116291
    Abstract: The present invention provides an image display capable of reducing power used up or consumed by a thin-film electron-emitter matrix.
    Type: Grant
    Filed: September 4, 2000
    Date of Patent: October 3, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Mutsumi Suzuki, Toshiaki Kusunoki, Makoto Okai, Masakazu Sagawa, Akitoshi Ishizaka
  • Patent number: 7079161
    Abstract: There is here provided an image display apparatus that adjusts a change of a drive condition resulting from an electrical resistance of a matrix wiring of a display panel scarcely using a hardware. The apparatus has an adjusted image data calculation unit that generates adjusted image data that is the image data to which adjustment is applied for relaxing an influence of a voltage drop caused by the electrical resistance of a row wiring for the input image data of one horizontal scan interval, wherein the adjusted image data calculation unit is provided with means for discretely forecasting and calculating a voltage drop amount in the space and time directions, to be generated on the row wiring during the one horizontal scan interval corresponding to input image data and means for calculating the adjusted image data in which adjustment is applied to the image data.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: July 18, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Sagano, Naoto Abe, Kohei Inamura, Hiroshi Saito, Takeshi Ikeda
  • Patent number: 7067984
    Abstract: The invention includes field emitters, field emission displays (FEDs), monitors, computer systems and methods employing the same for providing uniform electron beams from cathodes of FED devices. The apparatuses each include electron beam uniformity circuitry. The electron beam uniformity circuit provides a grid voltage, VGrid, with a DC offset voltage sufficient to induce field emission from a cathode and a periodic signal superimposed on the DC offset voltage for varying the grid voltage at a frequency fast enough to be undetectable by the human eye. The cathodes may be of the micro-tipped or flat variety. The periodic signal may be sinusoidal with peak-to-peak voltage of between about 5 volts and about 50 volts.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: June 27, 2006
    Assignee: Micron Technology, Inc.
    Inventor: Robert T. Rasmussen
  • Patent number: 7057586
    Abstract: In a flat panel display and an operation method thereof capable of lowering a capacitance of a pixel cell, an operation method of a flat panel display includes supplying a data pulse to first data lines of the panel, supplying a data pulse to second data lines of the panel and supplying a scan pulse to scan lines by being synchronized with the data pulse supplied to the first and the second data lines. In addition, an operation method of a flat panel display includes operating a left region of a panel after dividing the panel into two regions and operating a right region of the panel.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: June 6, 2006
    Assignee: LG Electronics Inc.
    Inventor: Seong Hak Moon
  • Patent number: 7046219
    Abstract: An image display apparatus of this invention includes a neighborhood data integration section 20 which integrates image data on respective colors corresponding to electron emitting devices proximate to an electron emitting device to be driven, and corresponding to a phosphor contributing to a halation, an adder 6 adds the integrated image data (R22, G22, and B22) on the respective colors, a coefficient operation section (7) which multiplies an addition result by a predetermined coefficient according to a luminous intensity of the halation, an adder (8) which adds outputs (R23, G23, and B23) obtained by inverting a sign of multiplication results to image data (R14, G14, and B14) corresponding to the electron emitting device to be driven, respectively, and a comparator 11 which compares an addition result with zero in magnitude, and which outputs a driving signal (R25) for the respective colors.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: May 16, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Izumi Kanai, Hisanobu Azuma
  • Patent number: 7012583
    Abstract: An apparatus for testing pixels of a flat panel display has a palette for holding a TFT substrate, drive signal source units, and predetermined voltage source units. The palette is grounded. One of the predetermined voltage source units applies a predetermined voltage to a Cs electrode of each of pixels constituting the TFT substrate so that the predetermined voltage is used as a reference voltage of the TFT substrate 11. The drive signal source units supply drive signals to a gate electrode G and a source electrode S respectively in each of the pixels constituting the TFT substrate. The voltages of the drive signals are floated by predetermined voltages given by the corresponding predetermined voltage source units respectively.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: March 14, 2006
    Assignee: Shimadzu Corporation
    Inventors: Guillermo Toro-Lira, David Baker
  • Patent number: 7009344
    Abstract: A flat panel display includes a back plate, gate electrode and cathode electrodes disposed on the back plate and insulated from each other by an insulating layer, a planar field emission source formed of carbonaceous material disposed on the cathode electrode, a grid plate provided with a plurality of apertures corresponding to a pixel area and spaced from the back plate, first and second grid electrodes formed on each surface of the grid plate, respectively, and a faceplate spaced from the grid plate and a screen formed on one surface thereof facing the grid plate.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: March 7, 2006
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Chun-Gyoo Lee, Sung-Ho Jo, Jong-Hun You, Jong-Min Kim
  • Patent number: 6975288
    Abstract: Disclosed is an electron-emitting device, an electron source, and an image-forming apparatus that have uniform electron-emitting characteristics, emit electron beams whose diameters are small, have simple constructions, and are easy to be manufactured. The electron-emitting device comprising: a first electrode arranged on a surface of a substrate; an insulating layer arranged on the first electrode; a second electrode arranged on the insulating layer; and an electron-emitting film arranged on the second electrode, where the second electrode has two side surfaces that oppose each other in a direction parallel to the surface of the substrate, and the electron-emitting film is arranged so as to be shifted toward one of the two side surfaces.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: December 13, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Michiyo Nishimura, Daisuke Sasaguri, Kazushi Nomura
  • Patent number: 6975289
    Abstract: A matrix addressed display device having a cathode means and grid electrode means comprising an orthogonal array of parallel row conductors and parallel column conductors in which means are providing for selectively applying cut-off and gain correction information to the row conductors and the column conductors. The cut-off and gain correction information may be applied so as to affect all of the display area equally and correct for warm up drift, or it may be applied so as to correct for the effect of a discrete number of hot cathode filaments being used or it may be applied on a pixel by pixel basis.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: December 13, 2005
    Assignee: International Business Machines Corporation
    Inventors: John Stuart Beeteson, Andrew Ramsay Knox, Anthony Cyril Lowe
  • Patent number: 6970162
    Abstract: An image display apparatus having a plurality of image forming devices. In an output circuit provided between constant voltage supplies and wiring for driving each of the image forming devices, MOSFETs are successively turned on from the one having a higher ON resistance at the time of switching to make a stepwise transition between outputs from the constant voltage supplies, and have steady potential, thereby limiting undesirable variation in signal potential at the time of switching.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: November 29, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiko Murayama, Tadashi Aoki, Aoji Isono, Kenji Shino
  • Patent number: 6963171
    Abstract: In a cathode substrate of an FED, spacers lines exclusive for connecting spacers to the ground were necessary besides scan lines and data lines, and a cathode substrate having a three-layer line structure was used in the prior art. The present invention realizes a high-reliable cold cathode type flat panel display which is easily produced and keeps performance that can be obtained by the three-layer line structure, using a cathode substrate having a two-layer line structure. The line structure of a cathode substrate (10) of an FED is made into a two-layer structure. Hitherto, lines of the first layer are bottom electrodes (11) which constitute electron sources and have been used as scan lines, and top electrodes (13) of the second layer have been used as data lines. In the present invention, however, the bottom electrodes (11) and the top electrodes (13) are changed to data lines and scan lines, respectively.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: November 8, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masakazu Sagawa, Toshiaki Kusunoki, Mutsumi Suzuki, Nobuaki Kabuto
  • Patent number: 6958739
    Abstract: Disclosed are an aging apparatus of a field emission device and a method thereof. The apparatus comprises an aging operation controlling unit for converting a direct current high voltage applied to an anode electrode into a high voltage of a pulse form, gradually increasing the converted high voltage of a pulse form with a certain interval and thus applying to the anode electrode, and performing an aging operation by controlling a voltage applied to a scan driving unit. According to this, arc is prevented, an entire panel aging time is reduced, and energy consumption is reduced.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: October 25, 2005
    Assignee: LG Electronics Inc.
    Inventor: Seong Hak Moon
  • Patent number: 6947018
    Abstract: An image display apparatus includes an image display member having a plurality of light-emitting portions, electron-emitting devices for emitting electrons and causing the light-emitting portions to emit light in accordance with an input image signal, and an adjustment unit for differentially adjusting the light emitting brightness for the plurality of light-emitting portions at different positions of the image display member, when an input image signal designates the same brightness for the plurality of light-emitting portions.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: September 20, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tatsuro Yamazaki
  • Patent number: 6946800
    Abstract: An electron emitter has an electric field receiving member formed on a substrate, a cathode electrode formed on one surface of the electric field receiving member, and an anode electrode formed on the one surface of the electric field receiving member, with a slit defined between the cathode electrode and the anode electrode. The electric field receiving member is made of a dielectric material. The electron emitter also has a modulation circuit for modulating a pulse signal applied between the cathode electrode and the anode electrode based on a control signal supplied from a controller such as a CPU to control at least an amount of emitted electrons.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: September 20, 2005
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Nobuyuki Kokune, Tomoya Horiuchi
  • Patent number: 6940231
    Abstract: The invention includes field emitters, field emission displays (FEDs), monitors, computer systems and methods employing the same for providing uniform electron beams from cathodes of FED devices. The apparatuses each include electron beam uniformity circuitry. The electron beam uniformity circuit provides a grid voltage, VGrid, with a DC offset voltage sufficient to induce field emission from a cathode and a periodic signal superimposed on the DC offset voltage for varying the grid voltage at a frequency fast enough to be undetectable by the human eye. The cathodes may be of the micro-tipped or flat variety. The periodic signal may be sinusoidal with peak-to-peak voltage of between about 5 volts and about 50 volts.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: September 6, 2005
    Assignee: Micron Technology, Inc.
    Inventor: Robert T. Rasmussen
  • Patent number: 6906706
    Abstract: Undue power consumption is reduced in the capacitance between data electrodes during addressing in a display panel. The power consumption associated with the capacitance is reduced to half as compared with the conventional panel, because the current associated with the discharge of the capacitance is independent of the power supply in the case of a combination of “L reset”, where the capacitance between data electrodes is discharged through a backward current path on the current sink terminal side, and “H reset”, where the capacitance between data electrodes is discharged through a backward current path on the current supply terminal side.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: June 14, 2005
    Assignee: Fujitsu Limited
    Inventors: Tadayoshi Kosaka, Kenji Awamoto, Fumihiro Namiki
  • Patent number: 6888519
    Abstract: There is provided a characteristic adjustment method for an image forming apparatus that is provided with a multi-electron source in which a plurality of electron-emitting devices are electrically connected by wiring and arranged on a substrate and a fluorescent member for emitting light by irradiation of an electron beam, the method including: a measurement step of dividing a display portion of the image forming apparatus into a plurality of areas and measuring light emitting characteristics of at least one or more of the electron-emitting devices in the respective divided areas, and a shifting step of shifting the light emitting characteristics of the electron-emitting devices in the divided areas to individual characteristic target values by applying a characteristic shift voltage to the electron-emitting devices.
    Type: Grant
    Filed: September 23, 2002
    Date of Patent: May 3, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihiko Yamano, Mitsutoshi Kuno, Shuji Aoki, Takahiro Oguchi
  • Patent number: 6882330
    Abstract: A field emission display device includes: a reset driving unit for supplying a reset pulse to a scan line and a scan driving unit for supplying a scan pulse to the scan line. The reset driving unit includes a first reset drive IC for receiving a first reset data from a reset data supplying unit, a second reset drive IC for receiving a second reset data from the reset data supplying unit and a first switch connected to the first reset drive IC and turned on/off by the second reset drive IC.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: April 19, 2005
    Assignee: LG Electronics Inc.
    Inventor: Seong Hak Moon
  • Patent number: 6876344
    Abstract: A flat thermionic emission screen (1) has a first substrate (2) on which are arranged an emission cathode (4) and an electron extraction grid (8), a second substrate (12) facing the first substrate (2) on which is arranged an anode (14) designed to collect the electrons emitted by the cathode (4), and an electronic control circuit of the anode (14) voltage having at least one commutation component (18, 20). The commutation component (18,20) is built into the first substrate (2) and in the second substrate (12) of the screen (1).
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: April 5, 2005
    Assignee: Commissariat a l 'Energie Atomique
    Inventor: Pierre Nicolas
  • Patent number: 6873308
    Abstract: The present invention is to provide an image display apparatus capable of properly correcting or adjusting, with small-scale hardware, variations in drive conditions due to electric resistance of matrix wiring on a display panel. The image display apparatus includes an adjusted image data calculation unit 14 for calculating adjusted image data as image data that has been compensated for the influence of voltage drop caused by resistance of at least the row wiring and a scan unit. The image display apparatus also includes an amplitude adjustment unit having a function for adjusting the amplitude of adjusted image data Dout, and a modulator 8 the takes in the adjusted image data with the amplitude adjusted and outputs a modulation signal to the column wiring.
    Type: Grant
    Filed: July 5, 2002
    Date of Patent: March 29, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Sagano, Naoto Abe, Kohei Inamura, Hiroshi Saito, Takeshi Ikeda
  • Patent number: 6873309
    Abstract: A display apparatus includes: a plurality of luminance modulation elements each modulated in luminance by a voltage of a positive polarity applied thereto, each of the luminance modulation elements being not modulated in luminance by a voltage of an opposite polarity applied thereto; a plurality of first lines electrically coupled to first electrodes of the plurality of luminance modulation elements; a plurality of second lines electrically coupled to second electrodes of the plurality of luminance modulation elements, the plurality of second lines intersecting the plurality of first lines; a first drive unit coupled to the plurality of first lines, the first drive unit outputting scanning pulses; and a second driver unit coupled to the plurality of second lines. The first drive unit sets the first lines in a nonselection state to a high impedance state having a higher impedance as compared with the first lines in a selection state.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: March 29, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Mutsumi Suzuki, Toshiaki Kusunoki, Masakazu Sagawa
  • Patent number: 6870522
    Abstract: There is provided an image display device and a method of adjusting an image display device, in which a loss in brightness due to a voltage drop is compensated to thereby obtain an excellent image. In a construction having a plurality of display elements driven by means of a matrix wiring, images which are used for making adjustments reflecting a plurality of compensation conditions are displayed. A person making an adjustment selects an appropriate condition with a remote controller and a button. Thus, compensated image data adjusted according to the selected condition is obtained.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: March 22, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Sagano, Naoto Abe, Hiroshi Saito
  • Patent number: 6863942
    Abstract: One or more highly-oriented, multi-walled carbon nanotubes are grown on an outer surface of a substrate initially disposed with a catalyst film or catalyst nano-dot by plasma enhanced hot filament chemical vapor deposition of a carbon source gas and a catalyst gas at temperatures between 300° C. and 3000° C. The carbon nanotubes range from 4 to 500 nm in diameter and 0.1 to 50 ?m in length depending on growth conditions. Carbon nanotube density can exceed 104 nanotubes/mm2. Acetylene is used as the carbon source gas, and ammonia is used as the catalyst gas. Plasma intensity, carbon source gas to catalyst gas ratio and their flow rates, catalyst film thickness, and temperature of chemical vapor deposition affect the lengths, diameters, density, and uniformity of the carbon nanotubes. The carbon nanotubes of the present invention are useful in electrochemical applications as well as in electron emission, structural composite, material storage, and microelectrode applications.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: March 8, 2005
    Assignee: The Research Foundation of State University of New York
    Inventors: Zhifeng Ren, Zhongping Huang, Jui H. Wang, Dezhi Wang
  • Patent number: 6847337
    Abstract: With the present invention, there is provided a driving method that favorably drives an electron source, which is driven in a passive matrix manner, without being affected by a disturbance. There is also provided an image-forming apparatus that uses this electron source. An anode electrode having a constant potential is arranged over a plurality of electron-emitting devices including gate electrodes and cathode electrodes. During passive matrix driving of the electron source where the amount of electrons to be emitted is adjusted by modulating potentials between the cathode electrodes and the gate electrodes, a predetermined time difference is maintained between the driving of signal lines in a group and the driving of signal lines in another group during the driving of signal lines divided into N groups after selection of scanning lines.
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: January 25, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeshi Ichikawa
  • Patent number: 6842160
    Abstract: For decreasing hardware for correction to compensate for decrease of luminance due to decrease in drive voltage of devices, a plurality of electron-emitting devices are arranged in a matrix pattern and wired by a plurality of row and column lines, a column wiring driving unit applies voltage pulses to the column lines, and row wiring driving units apply voltages to the row lines to switch a row to be selected. The image signal processing unit divides a luminance level of an image signal into plural areas in the signal amplitude direction in response to each split timing signal. There are provided means for detecting frequencies of luminance signals included in the respective amplitude areas, a correction quantity calculating unit for outputting correction signals based on the detected values, and an adding unit for adding the correction signals and luminance signals, which outputs results of addition as electron emission requirements to the column wiring driving unit.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: January 11, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tatsuro Yamazaki, Makiko Mori, Osamu Sagano
  • Patent number: 6838835
    Abstract: Methods of operating field emission displays are disclosed. In one embodiment, a method for operating a field emission display includes applying a voltage to an extraction grid with respect to an emitter in proximity to the extraction grid to extract electrons from the emitter, regulating a supply of electrons from the emitter in response to a control signal, and accelerating the electrons from the emitter towards a faceplate with an accelerating voltage that also reverse biases a semiconductor diode extending from a baseplate that includes the extraction grid and the emitter to the faceplate.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: January 4, 2005
    Assignee: Micron Technology, Inc.
    Inventor: Won-Joo Kim
  • Publication number: 20040257311
    Abstract: An image display apparatus of this invention includes a neighborhood data integration section 20 which integrates image data on respective colors corresponding to electron emitting devices proximate to an electron emitting device to be driven, and corresponding to a phosphor contributing to a halation, an adder 6 adds the integrated image data R22, G22, and B22 on the respective colors, a coefficient operation section 7 which multiplies an addition result by a predetermined coefficient according to a luminous intensity of the halation, an adder 8 which adds outputs R23, G23, and B23 obtained by inverting a sign of multiplication results to image data R14, G14, and B14 corresponding to the electron emitting device to be driven, respectively, and a comparator 11 which compares an addition result with zero in magnitude, and which outputs a driving signal R25 for the respective colors.
    Type: Application
    Filed: June 18, 2004
    Publication date: December 23, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Izumi Kanai, Hisanobu Azuma
  • Patent number: 6831619
    Abstract: An image-forming apparatus includes an image-forming device in an envelope. The image-forming device includes a member (e.g., a thin film electrode) which is carried on the inner surface of the envelope and is adapted to application of electron-accelerating voltage Va. The member-carrying part, such as a transparent face plate, of the envelope also includes on its outer surface a structure for applying a voltage substantially equal to the voltage Va (e.g., an electroconductive layer connected to the thin-film electrode by way of a certain resistance). The electric field across the part is significantly reduced to thereby prevent migration of sodium ions contained in the part, which can be made of soda lime glass.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: December 14, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasuyuki Todokoro
  • Publication number: 20040233137
    Abstract: A back substrate has a plurality of electron emission elements. A display substrate comprises an optically transparent substrate disposed opposite to the back substrate; an accelerating electrode formed on the inner face of the optically transparent substrate for accelerating electron beams emitted from the electron emission elements; and luminescent materials excited by the electron beams to emit light toward the outer face of the optically transparent substrate. A frame member supports the back substrate and display substrate on their peripheries. A vacuum chamber is defined by the back substrate, display substrate, and frame member. A conductor electrically connected to the accelerating electrode is drawn out to the outside of the vacuum chamber. A high voltage connector for supplying an accelerating voltage to the conductor is removably connected to the conductor.
    Type: Application
    Filed: October 10, 2003
    Publication date: November 25, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Yoshie Kodera, Tetsu Ohishi, Nobuo Masuoka, Akinori Maeda, Junichi Ikoma, Hidenao Kubota
  • Publication number: 20040233136
    Abstract: One image is displayed in a period as one frame, which includes one charge accumulation period and one light emission period. In the charge accumulation period, all electron emitters are scanned, and voltages depending on the luminance levels of corresponding pixels are applied to the electron emitters which correspond to pixels to be turned on (to emit light), to accumulate charges (electrons) in amounts depending on the luminance levels of corresponding pixels in the electron emitters which correspond to pixels to be turned on. In the next light emission period, a constant voltage is applied to all the electron emitters to emit electrons in amounts depending on the luminance levels of corresponding pixels from the electron emitters which correspond to pixels to be turned on, thereby emitting light from the pixels to be turned on.
    Type: Application
    Filed: March 24, 2004
    Publication date: November 25, 2004
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Takayoshi Akao
  • Patent number: 6822397
    Abstract: The present invention relates to the adjustment of luminance. The present invention is a method of manufacturing image forming apparatus including a step of applying characteristic shift voltage comprising a plurality of pulses in which the amplitude of the pulse obtained from the look-up table has two or more values, to the emitter, the look-up table storing the amplitude of the pulse and the number of the pulse for shifting characteristic of emitters to a predetermined luminance target value on the basis of the measurement result of the luminance. Moreover, the present invention is a method of manufacturing image forming apparatus comprising a step of applying the second pulses of characteristic shift voltage having the amplitude which was determined in response to the measurement result of the luminance after the first characteristic shift voltage had been applied to the emitter.
    Type: Grant
    Filed: May 6, 2003
    Date of Patent: November 23, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideshi Kawasaki, Shuji Aoki, Izumi Tabata, Akihiko Yamano, Hisashi Sakata
  • Patent number: 6822628
    Abstract: Methods for compensating for brightness variations in a field emission device. In one embodiment, a method and system are described for measuring the relative brightness of rows of a field emission display (FED) device, storing information representing the measured brightness into a correction table and using the correction table to provide uniform row brightness in the display by adjusting row voltages and/or row on-time periods. A special measurement process is described for providing accurate current measurements on the rows. This embodiment compensates for brightness variations of the rows, e.g., for rows near the spacer walls. In another embodiment, a periodic signal, e.g., a high frequency noise signal, is added to the row on-time pulse in order to camouflage brightness variations in the rows near the spacer walls. In another embodiment, the area under the row on-time pulse is adjusted to provide row-by-row brightness compensation based on correction values stored in a memory resident correction table.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: November 23, 2004
    Assignees: Candescent Intellectual Property Services, Inc., Candescent Technologies Corporation
    Inventors: James C. Dunphy, William Cummings, Christopher J. Spindt, Ronald L. Hansen, Jun (Gordon) Liu, Lee Cressi, Colin Stanners
  • Patent number: 6819054
    Abstract: An electronic circuit apparatus (5) for a field emission device (14) comprises a charge emission device electrically connected to a charge ballast electronic circuit (13,15). The charge ballast electronic circuit includes a capacitance device (25,26) electrically connected in series with a transistor (10,12) and electrically connected in parallel with a resistor (28,23) where the capacitance is chosen to adjust a charge emitted by the field emission device.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: November 16, 2004
    Assignee: Motorola, Inc.
    Inventors: Scott V. Johnson, Bernard F. Coll, Kevin O'Connor
  • Publication number: 20040207575
    Abstract: An aging driving method of a field emission display device can secure long lifetimes of panel by reducing possibilities of generation of arcing, by largely increasing energy distribution under a low voltage, and by applying a pulse voltage which is varied to reduce energy distribution under a high voltage as time goes, in aging processing. In addition, aging is performed in a very short time by using small energy in a pulse supply, thereby preventing a damage of a panel and much shortening an aging time. In addition, aging is performed in each pre-aging process and a main-aging process, to reduce contaminants, thereby lengthening lifetimes of a panel and securing reliability of a product.
    Type: Application
    Filed: January 7, 2004
    Publication date: October 21, 2004
    Applicant: LG Electronics Inc.
    Inventor: Seong-Hak Moon
  • Publication number: 20040207576
    Abstract: A spacer discharging apparatus and method of an FED are disclosed in which a pulse control signal synchronized with a vertical synchronous signal is outputted during a blanking time period. In the spacer discharging apparatus, a discharge path is formed to connect an anode electrode and a spacer ground electrode of an FED and a switch unit selectively connects the discharge path. Electric charge charged in the spacer is quickly discharged, so that generation of noise or visible appearance of the spacer can be prevented.
    Type: Application
    Filed: April 16, 2004
    Publication date: October 21, 2004
    Applicant: LG Electronics Inc.
    Inventor: Seong Hak Moon
  • Publication number: 20040189552
    Abstract: Flat panel displays, such as field emission displays (FEDs) and plasma displays are provided having reduced through-vacuum interconnects by incorporating driver circuitry on the same substrate as the active display region of the display device. In one implementation, vacuum-sealed image display device comprises a substrate; an active display region on the substrate and including addressable rows and columns defining pixels; and driver ICs on the substrate, outputs of each driver IC coupled to the rows and columns, the drivers ICs adapted to drive the active display region to display an image. The device also comprises a vacuum envelope forming a sealed volume containing at least a portion of the substrate, the active display region and the driver ICs, the sealed volume maintained in a vacuum, the vacuum envelope defining a vacuum border. As the resolution of flat panel displays increases, reducing interconnects becomes increasingly important.
    Type: Application
    Filed: March 31, 2003
    Publication date: September 30, 2004
    Applicants: Sony Corporation, Sony Electronics Inc.
    Inventor: Shigeki Miyazaki
  • Publication number: 20040189553
    Abstract: The present invention provides a bright and high-resolution display apparatus having a dynamic range exceeding the number of gray-scale voltage (or current) outputs, which a signal driver is capable of generating. In accordance with the present invention, a select period, in which a group of pixels on each row is driven, is divided into a plurality of sub-periods. The signal driver supplies a voltage output varying from sub-period to sub-period to selected pixels through a signal electrode. The pixel is capable of expressing various values of a gray scale, the size of which is at least approximately equal to (the number of gray-scale voltage outputs, which the signal driver is capable of generating)×(the number of sub-periods). By changing the ratio of the length of a sub-period to the length of another sub-period or the range of the driving voltage (or current), the dynamic range of the display can be further increased.
    Type: Application
    Filed: July 31, 2003
    Publication date: September 30, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Nobuaki Kabuto, Toshimitsu Watanabe, Yoshie Kodera, Mutsumi Suzuki, Tetsu Ohishi
  • Publication number: 20040183757
    Abstract: In a driving method for an electron-emitting device in which an electron-emitting member made of an aggregate of carbon fibers is made to emit electrons by a voltage being applied between a cathode electrode on which the electron-emitting member is formed and a counter electrode disposed in opposition to the cathode electrode, a driving voltage V smaller than a maximum applied voltage Vmax is applied between the cathode electrode and the counter electrode to drive the electron-emitting device, the maximum applied voltage Vmax being a maximum voltage applied between the cathode electrode and the counter electrode before the start of driving.
    Type: Application
    Filed: January 27, 2004
    Publication date: September 23, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kazunari Oyama, Masafumi Kyogaku, Takeo Tsukamoto