Field Emissive (e.g., Fed, Spindt, Microtip, Etc.) Patents (Class 345/75.2)
  • Patent number: 7612743
    Abstract: An Electron Emission Display (EED) with decreased signal distortion has a data driver to convert data driving signals into display data signals having predetermined data voltage levels and to output the display data signals to data electrode lines. A method of driving the EED includes supplying an auxiliary voltage to the data electrode lines during blanking periods according to subsequent data and supplying the display data signals during active periods between the blanking periods.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: November 3, 2009
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Ji-Won Lee, Duck-Gu Cho
  • Patent number: 7612342
    Abstract: The present application discloses methods and devices for increasing the light output of a scintillator. Using the methods of the present disclosure, a very high intensity electric field is applied to a scintillator exposed to ionizing radiation and provides light outputs that far exceeds those previously obtained in the art. The light output gains are very high, on the order of 10 to 100 times those obtained with prior methods, and will make it possible to achieve sufficient brightness to enable the use of a cathode ray tube or a field emission display in new devices. In the field of x-ray imaging, a bright scintillator will have tremendous potential in many important applications, such as computed tomography (CT), SPECT, diagnostic digital radiology, and the like.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: November 3, 2009
    Assignee: Radiation Monitoring Devices, Inc.
    Inventor: Vivek V. Nagarkar
  • Patent number: 7592981
    Abstract: A driving method of a self-luminous display apparatus having a plurality of self-luminous elements including each of pixels placed like a matrix in a pixel row direction and a pixel line direction and driving a display portion by passing a current between an anode and a cathode of each of the self-luminous elements and thereby emitting light from each of the pixels.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: September 22, 2009
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventor: Tomoyuki Maeda
  • Patent number: 7592979
    Abstract: An image display apparatus comprising: a plurality of pixels each having an electron emitting element and a light emitting area to be irradiated by electrons from the element; and a driving circuit for outputting a driving signal that drives the element, wherein the plurality of the light emitting areas include a plurality of light emitting areas that respectively emit light emitting colors differing from each other, wherein the circuit includes a correction circuit for correcting an input signal, and wherein the correction circuit executes a correction to the input signal for a predetermined electron emitting element based on a value obtained by adjusting a value corresponding to a quantity of electrons emitted from an electron emitting element proximate to the predetermined electron emitting element by a value corresponding to the light emitting color of the light emitting area of the pixel to which the proximate electron emitting element belongs.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: September 22, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Hayama, Hideaki Yui
  • Patent number: 7564432
    Abstract: A method of reducing luminance decay of emissive elements in a matrix addressed emissive display device includes generating control data corresponding to a static image to be displayed on a matrix of individually addressable emissive display elements. Drive signals are generated as a function of the control data, and are provided to the matrix to thereby energize the corresponding emissive display elements of the matrix in order to display the static image on the matrix. The control data are altered substantially continuously in order to substantially continuously move the static image on the matrix.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: July 21, 2009
    Assignee: Rockwell Collins, Inc.
    Inventors: Martin J. Steffensmeier, Randy A. Naeve, Thomas C. Rohr, Linley E. Woelk
  • Patent number: 7561131
    Abstract: A display unit comprising electro-wetting pixels (1300) is provided. The inventive pixels (1300) provide bistable or multi-stable pixel states and thus facilitates passive matrix addressing. For this purpose an additional electrode (1305) is arranged for each multi-stable state. Consequently, each pixel comprises one counter electrode (1306) and at least one pair of address and retain electrodes (1304, 1305). In order to activate a pixel, an address potential is applied to the address and retain electrodes (1304, 1305) in relation to the counter electrode (1306), and in order to deactivate a pixel the potential is removed. In order to retain a current pixel state a retain potential is applied to only the retain electrode (1305) in relation to the counter electrode (1306); the current pixel state, be it active or passive, will then be preserved and the retain potential configuration thus provides a bistable pixel state.
    Type: Grant
    Filed: February 18, 2004
    Date of Patent: July 14, 2009
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Willem Lubertus Ijzerman, Michel Cornelis Josephus Marie Vissenberg, Marcellinus Petrus Carolus Michael Krijn, Siebe Tjerk De Zwart
  • Publication number: 20090153444
    Abstract: An image display apparatus includes a face plate with a plurality of light-emitting regions, a rear plate with electron-emitting devices corresponding to the plurality of light-emitting regions, respectively, and a drive circuit that drives the electron-emitting devices. The drive circuit has a correction circuit that calculates a correction value evaluated by influence of emitted electrons from electron-emitting devices which correspond to light-emitting regions around the light-emitting region to be corrected, and corrects a signal input to the electron-emitting device corresponding to the light-emitting region to be corrected based on the correction value. The correction circuit has an adjustment circuit that adjusts the correction value based on variation of characteristics of the plurality of light-emitting regions. Therefore, an image display having improved correction performance and lesser display unevenness can be performed.
    Type: Application
    Filed: December 16, 2008
    Publication date: June 18, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Tsuyoshi Ooya, Hisafumi Ebisawa
  • Patent number: 7535439
    Abstract: A display device driver constructed of scanning selection switches corresponding to a plurality of scanning wiring lines, a non-selection switch which brings the scanning wiring line into a non-selected state, a feedback switch which detects a scanning electrode potential and a negative feedback amplifier which sets the scanning electrode potential to a predetermined potential every electrode based on the scanning electrode potential detected by the feedback switch, and a time constant formed of a combined capacitance of a capacitance of the feedback switch and a wiring line capacitance and a feedback switch resistance is set to be smaller than that of a display panel capacitance and a scanning selection switch resistance.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: May 19, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hiroyuki Nitta, Masahisa Tsukahara, Toshifumi Ozaki
  • Patent number: 7532180
    Abstract: An image display apparatus includes a display panel having a plurality of electron emission portions that emit electrons, a plurality of light emitting regions positioned corresponding to the plurality of electron emission portions to emit light in response to irradiation of electrons from the electron emission portion thereon, and a shielding member provided between a substrate having the electron emission portions provided thereon and an opposing substrate having the light emitting regions thereon, and a correction circuit that corrects a pixel signal for modulating the electron emission portions. The shielding member shields electrons reflected from peripheral light emitting regions adjacent to a predetermined one of the light emitting regions to the predetermined light emitting region, and irradiates electrons from the shielding member to the predetermined light emitting region.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: May 12, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Yui, Akira Hayama
  • Patent number: 7525518
    Abstract: An image display apparatus includes an image display devices driven in a matrix by a plurality of row wirings and column wirings, a scanning circuit for sequentially selecting and scanning the row wirings, a modulation circuit for applying a modulated signal, voltage amplitude of which varies in one pulse signal, to the column wirings, and a voltage drop compensation circuit for calculating corrected image data for reducing an influence of voltage drops due to at least resistance components of the row wirings, with respect to image data. The voltage drop compensation circuit include an effective voltage calculating circuit for finding an effective voltage value on the basis of the image data, and a compensation value calculating circuit for calculating a compensation value for reducing an influence of voltage drops due to at least resistance components of the row wirings, with respect to the effective voltage value.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: April 28, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Sagano, Hiroshi Saito
  • Patent number: 7525519
    Abstract: An electron emission device includes a first electrode having a data signal applied thereto, a second electrode having a scan signal applied thereto, an electron emitter for emitting electrons in response to a voltage difference between the data signal and the scan signal, and a third electrode having a focusing signal for focusing the electrons emitted from the electron emitter. In the electron emission device, an off-voltage of the scan signal is set lower than an on-voltage of the data signal.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: April 28, 2009
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Cheol-Hyeon Chang, Sang-Hyuck Ahn, Su-Bong Hong, Sang-Jo Lee
  • Patent number: 7522132
    Abstract: An image display apparatus capable of displaying a preferable image whose dark place contrast has a large value and whose color-reproducibility and gray-level reproducibility are excellent. A voltage level of a scanning selective signal is changed in response to a request from outside or the like, so that a black level luminance is reduced to improve dark place contrast. In addition, when the voltage level of the scanning selective signal is changed, a conversion table for converting an input luminance into a modulation signal is changed to another conversion table. Therefore, for example, it is possible to maintain a display gray-level characteristic before and after the voltage level of the scanning selective signal is changed.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: April 21, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuhiro Hamamoto, Takahiro Oguchi
  • Patent number: 7522131
    Abstract: An Electron Emission Display (EED) device, adapted to of adjust a pulse width of data signal according to an active pulse width of a horizontal synchronization signal, includes: a scan driver, a data driver; an EED panel displaying display data; a reference signal memory adapted to store a lookup table of active pulse widths of horizontal synchronization signals defined by a system clock and reference signals corresponding to the active pulse widths of the horizontal synchronization signals; a reference signal referring unit adapted to output a reference signal in accordance with the lookup table stored in the reference signal memory; and a gray level signal generator adapted to count the reference signal and output a gray level signal to the data driver, the data driver outputting video data corresponding to the gray level signal to data electrode lines of the EED panel.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: April 21, 2009
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Mun-Seok Kang
  • Patent number: 7492335
    Abstract: A field emission device (100) is provided for reducing power and audible noise during discharging of dielectric surfaces (137, 138). The field emission device (100) comprises an anode (122) and a first substrate (111) including a cathode plate (110) comprising a plurality of active display devices (114) and dielectric surfaces (137, 138). The plurality of active display devices (114) emit electrons (132) to strike the anode during a scanning mode, and emit electrons (135) to strike the dielectric surfaces (137, 138) during a discharge mode. At least one of a plurality of spacers (136) positioned between the anode (122) and the cathode plate (110) comprise a first sense electrode (142) positioned proximate to the anode (122), and a second sense electrode (144) positioned proximate to the cathode plate (110) and spaced apart from the first sense electrode (142).
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: February 17, 2009
    Assignee: Motorola, Inc.
    Inventor: Scott V. Johnson
  • Publication number: 20090009438
    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 30, 2008
    Publication date: January 8, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: IZUMI KANAI, Hisanobu Azuma
  • Publication number: 20090002352
    Abstract: A driving apparatus is provided for driving a display module. The driving apparatus comprises a comparing module, a processing module, and a first converting module. The comparing module is used for comparing an input signal with a feedback signal and generating a comparing signal. The processing module is coupled to the comparing module for processing the comparing signal and generating a processing signal. The first converting module is coupled to the processing module for converting the processing signal to a driving voltage. The driving apparatus drives the display module by the driving voltage.
    Type: Application
    Filed: February 5, 2008
    Publication date: January 1, 2009
    Inventors: Tsung-Hsiang Huang, Chun-Ming Cheng
  • Publication number: 20080309592
    Abstract: By preventing an electron-emitting device from being short-circuited when the discharge occurs, currents flown due to the short circuit are reduced to reduce effects of a discharge.
    Type: Application
    Filed: May 29, 2008
    Publication date: December 18, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yasuo Ohashi, Hisanobu Azuma, Jun Iba
  • Publication number: 20080284314
    Abstract: Provided is a field emission display (FED) capable of driving on the basis of current and preventing leakage current caused by thin film transistors (TFTs). The FED includes: a plurality of unit pixels including an emission element in which cathode luminescence of a phosphor occurs and a TFT for driving the emission element; a current source for applying a scan signal to each unit pixel; and a voltage source for applying a data signal to each unit pixel. Here, the on-current of the current source is high enough to take care of the load resistance and capacitance of a scan row within a given writing time, and the off-current of the current source is so low that the electron emission of each pixel can be ignored. In addition, the pulse amplitude or pulse width of the data signal applied from the voltage source is changed, and thereby the gray scale of the display is represented.
    Type: Application
    Filed: November 27, 2006
    Publication date: November 20, 2008
    Applicant: Electronics and Telecommunications Research Instit
    Inventors: Yoon Ho Song, Dae Jun Kim, Jin Woo Jeong, Jin Ho Lee, Kwang Yong Kang
  • Patent number: 7432883
    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: Grant
    Filed: January 27, 2004
    Date of Patent: October 7, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazunari Oyama, Masafumi Kyogaku, Takeo Tsukamoto
  • Patent number: 7432884
    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: March 9, 2006
    Date of Patent: October 7, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Izumi Kanai, Hisanobu Azuma
  • Patent number: 7417380
    Abstract: An electron emission device has an optimized inner structure where the electrons emitted from the electron emission regions are straightly migrated toward the phosphor layers. The electron emission device includes first and second substrates facing each other, and cathode electrodes formed on the first substrate. Electron emission regions are formed on the cathode electrodes. An insulating layer and gate electrodes are formed on the cathode electrodes and have openings exposing the electron emission regions. Phosphor layers are formed on the second substrate. An anode electrode is formed on a surface of the phosphor layers. The distance z between the cathode and the anode electrodes satisfies the following condition: 0.7d((Va?Vc)/Vg)?z?1.4d((Va?Vc)/Vg), where Vc indicates the voltage applied to the cathode electrodes, Vg the voltage applied to the gate electrodes, Va the voltage applied to the anode electrode, and d the distance between the cathode and the gate electrodes.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: August 26, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Seung-Hyun Lee, Cheol-Hyeon Chang
  • Patent number: 7417379
    Abstract: A cold cathode type flat panel display which is an image display device includes 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 spacer lines for giving to the spacers a voltage lower than an acceleration voltage which is applied to an accelerating electrode.
    Type: Grant
    Filed: May 2, 2007
    Date of Patent: August 26, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Masakazu Sagawa, Toshiaki Kusunoki, Mutsumi Suzuki, Nobuaki Kabuto
  • Patent number: 7405711
    Abstract: A fixed pixel display device has a construction such that the leading-edge and trailing-edge waveforms of a voltage to be applied to a data electrode can be made steep. The fixed pixel display device is provided with scanning electrodes, data electrodes connected to actuation drivers (50), and light-emitting regions. Each of the actuation drivers (50), includes a switching circuit, an output circuit (51), and a subtraction circuit (52). The switching circuit is equipped with a first switching circuit (53), a second switching circuit (54), and a comparator (55).
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: July 29, 2008
    Assignee: Sony Corporation
    Inventor: Hiroyuki Ikeda
  • Patent number: 7403175
    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: October 19, 2004
    Date of Patent: July 22, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: James C. Dunphy, William Cummings, Christopher J. Spindt, Ronald L. Hansen, Jun (Gordon) Liu, Lee Cressi, Colin Stanners
  • Patent number: 7403178
    Abstract: Provided is a source driver circuit for an active matrix electroluminescent (EL) display including a digital-to-analog converter/ramp circuit for converting a digital signal into an analog signal, and generating a ramp signal in this process, simultaneously, whereby high degree of integration would be possible since a conventional complicated circuit is not required and gray scale with the high characteristic can be implanted, regardless of a change of a temperature or a threshold voltage.
    Type: Grant
    Filed: April 6, 2004
    Date of Patent: July 22, 2008
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yil Suk Yang, Jong Dae Kim, Dae Woo Lee, Tae Moon Roh, Il Yong Park, Sung Ku Kwon, Byoung Gon Yu
  • Publication number: 20080150934
    Abstract: A current detection data is acquired by a scanning line current detection resistance, an adder-subtracter and an A/D converter. the current detection data is inputted to a voltage correction circuit, the voltage correction circuit output a correction signal. Using the correction signal, a scanning electrode voltage correction circuit performs the correction of the scanning selection voltage. Further, the voltage correction circuit generates data electrode drive data based on the current detection data and image data and inputs the data electrode drive data to a data electrode drive circuit. the present invention prevent a change of brightness and of smear with time.
    Type: Application
    Filed: November 27, 2007
    Publication date: June 26, 2008
    Inventors: Toshifumi Ozaki, Masahisa Tsukahara, Fumio Haruna, Junichi Yokoyama, Toshimitsu Watanabe
  • Patent number: 7388561
    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: February 4, 2005
    Date of Patent: June 17, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihiko Yamano, Mitsutoshi Kuno, Shuji Aoki, Takahiro Oguchi
  • Patent number: 7385355
    Abstract: The invention provides a display device using thin film type electron sources having a structure that can be formed in a simple manufacturing process. A lower electrode, a protective insulating layer and an interlayer film are formed on a cathode substrate. An upper bus electrode made from a laminated film of a metal film lower layer and a metal film upper layer is provided further on the interlayer film. A film of an upper electrode of a thin film type electron source for each pixel constituted by an insulating layer serving as an electron accelerating layer on the lower electrode and the upper electrode is formed on two stripe electrodes of the upper bus electrode in that pixel and another upper bus electrode in an adjacent pixel by sputtering. Then, the upper electrode is separated by self-alignment due to a setback portion of the metal film lower layer and an appentice of the metal film upper layer of the corresponding upper bus electrode.
    Type: Grant
    Filed: August 10, 2006
    Date of Patent: June 10, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Toshiaki Kusunoki, Masakazu Sagawa, Mutsumi Suzuki
  • Patent number: 7379037
    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: Grant
    Filed: March 24, 2004
    Date of Patent: May 27, 2008
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Takayoshi Akao
  • Patent number: 7369105
    Abstract: A spacer discharging apparatus and method of a field emission display (FED) are disclosed. The spacer discharging apparatus of an FED includes a first resister connected between an anode electrode of the FED and a high voltage power source unit applying a high voltage to the anode electrode, and a switch unit connected to the anode electrode and the first resister and selectively connecting the anode electrode and the spacer ground electrode of the FED.
    Type: Grant
    Filed: April 16, 2004
    Date of Patent: May 6, 2008
    Assignee: LG Electronics Inc.
    Inventor: Seong Hak Moon
  • Patent number: 7358934
    Abstract: In an FED (Field Emission Display), lowering of a color temperature is suppressed which is caused by that light emission luminance of respective color phosphors is different from each other so as to achieve a better white balance. A display apparatus is equipped with a cathode substrate containing a plurality of electron emitter elements, and an anode substrate. The anode substrate is arranged opposite to the cathode substrate, and contains three colors of red, green, blue phosphors which are excited by electrons emitted from the electron emitter elements so as to emit light. Then, an area of either the red phosphor or an area of the blue phosphor is made smaller than an area of the green phosphor.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: April 15, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Toshimitsu Watanabe, Go Uchida, Masaki Nishikawa, Tetsu Ohishi
  • Patent number: 7358933
    Abstract: An electron emission display includes a display panel having a first substrate on which at least one first electrode is formed, a second substrate on which a second electrode and a third electrode on which an electron emission source is formed are formed. A fourth electrode is formed between the first and second substrates to focus towards a corresponding phosphor surface area on the at least one first electrode the electrons emitted by the electron emission source towards a corresponding phosphor surface area on the at least one first electrode, the second electrode being insulated from the third electrode and crossed therewith. A scan electrode driver applies scan pulses to the second electrode. A data electrode driver applies data pulses to the third electrode. A focusing electrode driver applies focusing voltages to the fourth electrode. The focusing electrode driver applies different voltages according to image displayed states on the display panel.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: April 15, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Duck-Gu Cho
  • Patent number: 7336245
    Abstract: An electron emission device (EED) includes a display panel, first and second electrode drivers, and a controller. The display panel includes first electrodes in the column direction, second electrodes in the row direction, and an electron emission source. The first and the second electrode drivers drive the first and the second electrodes. The controller receives first vertical and horizontal synchronous signals and an input signal including video data, regenerates a first vertical synchronous signal and a second horizontal synchronous signal according to a blank-time information of a blank-time for representing no gray scales of an image and an on-time information of an on-time for representing the gray scales thereof, generates the drive signal for driving the display panel based on the regenerated second vertical and horizontal synchronous signals, and outputs them to the first and second electrode drivers.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: February 26, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Mun-Seok Kang
  • Publication number: 20080007491
    Abstract: A mirror having a field emission information display includes a semitransmitting reflecting mirror body for a rear vision mirror installed in the car, a field emission unit, a control unit, and a satellite navigation module. The field emission unit is installed in the semitransmitting reflecting mirror body. The control unit is installed in the semitransmitting reflecting mirror body and is connected with the field emission unit for controlling the field emission unit to display information images. The satellite navigation module is installed in the semitransmitting reflecting mirror body and is connected with the control unit for receiving a satellite signal and transmitting the satellite signal to the control unit. Thereby, the satellite signal is controlled by the control unit so as to be transmitted to the field emission unit. The field emission unit generates an information image area on the surface of the semitransmitting reflecting mirror body.
    Type: Application
    Filed: July 5, 2006
    Publication date: January 10, 2008
    Inventor: Kuei Wen Cheng
  • Patent number: 7315314
    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: September 26, 2005
    Date of Patent: January 1, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Sagano, Naoto Abe, Kohei Inamura, Hiroshi Saito, Takeshi Ikeda
  • Patent number: 7312770
    Abstract: An image display device which prevents damage to an electron-emitting device from discharge between a faceplate and a rear plate is provided. A conductive plate 12 including a transparent conductive film is formed over a surface of a substrate 11, a distance specifying member 13 having a plurality of openings is formed on the conductive area 12, a fluorescent material 14 is arranged in the opening, and a conductive film 15 is arranged on the fluorescent material 14 to for a face plate. A resistance Rx between the adjacent conductive films 15 is set larger than a resistance Rz, between the conductive film 15 and the conductive area 12. Discharge current generated between each conductive film 15 and a rear plate 21 is caused to flow into the conductive area 12 by applying anode voltage to the conductive area 12, which suppresses influence on an electron-emitting device 23.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: December 25, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomoya Onishi
  • Patent number: 7310076
    Abstract: An display apparatus arranged in a matrix having plural luminance modulation elements for modulating or do not modulating luminance depending upon application of a voltage of positive or reverse polarity, having plural parallel scanning electrodes and plural parallel data electrodes, in which each luminance modulation element is disposed at an intersection between the scanning electrode and the data electrode, and having first driving means connected to the scanning electrodes and outputting scanning pulses, and second driving means connected to the data electrodes, wherein the scanning electrodes are grouped into those in a selected state applied with a scanning pulse and those other than described above in a non-selected state at a certain time point during the scanning period; the number of the scanning lines in the selected state is n1; the scanning lines in the non-selected state are grouped into non-selected state scanning lines at a high impedance state and non-selected state scanning lines at a low im
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: December 18, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Mutsumi Suzuki, Masakazu Sagawa, Toshiaki Kusunoki
  • Patent number: 7298094
    Abstract: To provide an image display apparatus, including first to N-th electron-emitting devices; a spacer; a driving circuit for correcting each of the first to N-th driving signals for driving the first to N-th electron-emitting devices and outputting it; first to N-th light emission areas; in which the driving circuit has a correction circuit; and the correction circuit has a first circuit of calculating a correction value for correcting the driving signal; a second circuit of calculating a representative value by using a plurality of correction values for correcting the driving signal for driving each electron-emitting device of a group consisted of near M pieces of electron-emitting devices including first and second electron-emitting devices; a storage unit for storing the representative value; and a third circuit for correcting a driving signal for driving each electron-emitting device of the group by using the representative value.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: November 20, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hideaki Yui
  • Publication number: 20070262927
    Abstract: An electron emission display device including: a pixel area for emitting electrons depending on voltage applied to a first electrode and a second electrode; a timing controller for outputting varying pulse widths clocks, the pulse widths of clocks being varied depending on gray scales of image signals. The display device also includes a data driver for generating data signals using the image signals and transferring them to the first electrode; a scan driver generating scan signals and transferring them to the second electrode; and a voltage controller for controlling the voltage of the second electrode depending on the sum of the image signals in one frame interval, wherein the data driver counts the number of the clock pulses to control the pulse widths of the data signals.
    Type: Application
    Filed: November 7, 2006
    Publication date: November 15, 2007
    Inventors: Dong Hyup Jeon, Mun Seok Kang
  • Patent number: 7295174
    Abstract: The present invention reduces smears arising from voltage decreases caused by the wiring resistance of scan lines for electron emission device selection. The display unit includes an FED panel in which scan lines, data lines, and electron supply devices are positioned at the intersections of the data lines and scan-lines. A scan driver for supplying a selection signal to the scan lines, and a data driver for supplying a drive signal to the data lines are provided. Electron emission devices selected by the selection signal are driven by the drive signal. A signal corrector circuit individually corrects the drive signal to be supplied to each data line to compensate for a voltage decrease caused by the wiring resistance in each column of the scan lines.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: November 13, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Toshimitsu Watanabe, Nobuaki Kabuto, Mutsumi Suzuki, Yoshihisa Ooishi, Mitsuo Nakajima, Junichi Ikoma
  • Publication number: 20070257865
    Abstract: A method for driving a field emission device (FED) applies an alternating (AC) voltage as a driving voltage for emitting electrons in a field emission device comprising cathode electrode including an emitter and an anode electrode facing the cathode electrode. A method for aging an FED uses a constant voltage so that electrons cannot be emitted from the electron emission source, and an AC voltage so that electrons can be periodically emitted from the emitter when the FED is aged.
    Type: Application
    Filed: May 2, 2007
    Publication date: November 8, 2007
    Inventors: Chan-Wook Bajk, Jeong-Hee Lee, Jeong-Na Heo, Deuk-Seok Chung, Tae-Won Jeong, Kyoung-Won Min
  • Patent number: 7280089
    Abstract: An apparatus and method for driving a field emission display (FED) device are disclosed. By applying a voltage to a specific electrode (data electrode or mesh electrode) of the FED device during a blanking time of a display frame of an FED, electric charges unnecessarily charged in the FED device can be removed.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: October 9, 2007
    Assignee: LG Electronics Inc.
    Inventor: Seong-Hak Moon
  • Patent number: 7268750
    Abstract: This invention discloses an arrangement for suppressing an erroneous display and suppressing damage to an image display apparatus when a power source is turned on, the power source is turned off, an outlet is removed, or power fails. Particularly, this invention discloses an arrangement for stopping, for a predetermined time, input of a scanning signal or modulation signal to a display panel or application of an accelerating potential in turning on the power source. This invention discloses an arrangement for stopping input of a scanning signal or modulation signal to the display panel, and then stopping supply of power in turning off the power source.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: September 11, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Aoji Isono, Tatsuro Yamazaki
  • Publication number: 20070171152
    Abstract: A method for driving a flat-type display device which includes a cathode panel having first electrodes and second electrodes and an anode panel, the cathode panel and the anode panel having spacers is provided. The method includes the steps of: in the non-display operation period of the flat-type display device, determining a normalized first current from a first current by non-display-driving the electron emitter areas near the spacers, and determining a normalized second current from a second current by non-display-driving the electron emitter areas which are not near the spacers; and in the actual display operation period of the flat-type display device, setting the driving conditions for the electron emitter areas on the basis of the normalized first current and normalized second current so that the electron emission conditions in the electron emitter areas near the spacers and not near the spacers are substantially the same.
    Type: Application
    Filed: January 18, 2007
    Publication date: July 26, 2007
    Applicant: Sony Corporation
    Inventors: Yukinobu Iguchi, Hiroyuki Ikeda, Yasuhito Hatano, Kunihiko Nagamine
  • Patent number: 7242379
    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: September 1, 2004
    Date of Patent: July 10, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tatsuro Yamazaki
  • Patent number: 7239078
    Abstract: A field emission display (FED) and a driving method thereof. The FED of the present invention sequentially applies a selection signal to second electrodes through a scan driver, a data signal to a first group of first electrodes through a first data driver, and a data signal to a second group of the first electrodes through a second data driver. In this way, data lines are divided into data lines in the upper side of the screen and data lines in the lower side of the screen and are then separately driven, thereby preventing a non-uniform brightness of the upper and lower sides of the screen caused by a resistance component of the data lines.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: July 3, 2007
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Hyang-Suk No
  • Patent number: 7233301
    Abstract: A flat panel display includes a vacuum envelope, a cathode, a gate electrode substrate, and a phosphor screen and anode electrode. The vacuum envelope includes a front glass plate which is at least partly transparent and a substrate opposing the front glass plate. The cathode is formed on the substrate and has an electron-emitting source. The gate electrode substrate has an electron-passing hole and is arranged in the vacuum envelope to oppose the substrate to be separate from the cathode. The phosphor screen and anode electrode are formed on a surface of the front glass plate in the vacuum envelope. The gate electrode substrate includes at least an insulating substrate and a gate electrode. The insulating substrate has the electron-passing hole. The gate electrode is formed on the insulating substrate. A method of manufacturing a flat panel display is also disclosed.
    Type: Grant
    Filed: October 8, 2003
    Date of Patent: June 19, 2007
    Assignee: Noritake Co., Ltd.
    Inventors: Junko Yotani, Sashiro Uemura
  • Patent number: 7224331
    Abstract: A display device includes a display panel having cathodes, gates, and anodes in which the cathodes and the gates are connected in a matrix manner, and an electron emitter which emits electrons in a state where a voltage is applied only between the cathodes and the anodes and which is provided with the cathode. A display of pixels is performed under a dark state by stopping electron emission from the electron emitter for the anodes by applying a stop voltage between the cathodes and the gates. In addition, a controller controls operation of a circuit for driving a display panel in such a way that a potential of each of the anodes becomes not less than a threshold value potential by which the potential of each of the anodes can perform electron emission from the electron emitter after a predetermined time elapse from starting of application of a drive voltage which provides a specified display state or the stop voltage between the cathodes and the gates when a display starting signal is generated.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: May 29, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeki Yabu, Takeo Tsukamoto
  • Patent number: RE40490
    Abstract: A method and apparatus for programmable field emission display comprising an array of cathodoluminescent elements. Each cathodoluminescent element in the array is responsive to separate select signals to cause light to be emitted from said display at a location in the array corresponding to each separate cathodoluminescent element. In one embodiment, to account for processing variation and the like, each cathodoluminescent element is provided with a programmable element for adjusting the operating level of the associated cathodoluminescent element in response to select signals of predetermined voltage levels. Each programmable element includes a charge storage device and is initially programmed by storing a level of electric charge thereon such that uniformity of operation among the plurality of cathodoluminescent elements in the array is improved. In one embodiment the programmable element comprises a floating gate transistor.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: September 9, 2008
    Assignee: Micron Technology, Inc.
    Inventors: Tianhong Zhang, Zhongyi Xia, John Lee, Benham Moradi
  • Patent number: RE40566
    Abstract: A display device consisting of an electron-emitting device which is a laminate of an insulating layer and a pair of opposing electrodes formed on a planar substrate. A portion of the insulating layer is between the electrodes and a portion containing an electron emitting region in between one electrode and the substrate. Electrons are emitted from the electron emission region by a voltage to the electrodes, thereby stimulating a phosphorous to emitting light.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: November 11, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seishiro Yoshioka, Ichiro Nomura, Hidetoshi Suzuki, Toshihiko Takeda, Tetsuya Kaneko, Yoshikazu Banno, Kojiro Yokono