Field Emissive (e.g., Fed, Spindt, Microtip, Etc.) Patents (Class 345/75.2)
  • Patent number: 10049715
    Abstract: A semiconductor storage device includes a memory cell, a switch, a source driver, a drain driver, a voltage measurement circuit and a control electrode driver. The memory cell has a control electrode, a floating electrode, a source and a drain. In a writing to the memory cell, the voltage measurement circuit measures a voltage generated between the control electrode and the source when the switch is in an on state connecting the control electrode and the drain and a predetermined current flows from the current source to the memory cell, and the control electrode driver applies to the control electrode a voltage that is controlled based on the voltage measured by the voltage measurement circuit.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: August 14, 2018
    Assignee: DENSO CORPORATION
    Inventor: Yoshihide Kai
  • Patent number: 10042495
    Abstract: A touch display panel, a manufacturing method and a driving method thereof and a touch display device are provided. The touch display panel includes an array substrate, a plurality of subpixels and a driver chip for outputting a signal to cathode layers in each subpixel group. Each subpixel includes an anode layer, a light-emitting layer and a cathode layer; one subpixel group is formed by at least two adjacent subpixels and cathode layers of the subpixels in a same subpixel group are connected. The driver chip is electrically connected with a cathode layer of at least one subpixel in the subpixel group through a conductive wire, and configured to output a common voltage signal to cathode layers in each subpixel group in a display period of one frame and to output a touch drive signal to the cathode layers in each subpixel group in a touch period of one frame.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: August 7, 2018
    Assignees: BOE TECHNOLOGY GROUP CO., LTD, BEIJING BOE OPTOELECTRONICS TECHNOLOGY CO., LTD
    Inventors: Ming Yang, Xue Dong, Xiaochuan Chen, Haisheng Wang, Yingming Liu, Yanchen Li
  • Patent number: 9898970
    Abstract: A display device includes a data driver configured to generate a data signal based on a data voltage; a display panel configured to be driven based on a first power supply voltage and the data signal; a timing controller configured to control operations of the data driver and the display panel and configured to generate a ready signal indicating a power supply timing; a first voltage regulator configured to generate the first power supply voltage based on a first input voltage and a first enable signal; a second voltage regulator configured to generate the data voltage based on the first input voltage and a second enable signal; and a power sequence controller configured to generate the first enable signal based on the ready signal and the data voltage and configured to generate the second enable signal based on the ready signal and the first power supply voltage.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: February 20, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Byeong-Doo Kang, Jong-Man Bae
  • Patent number: 9881588
    Abstract: An imaging and display apparatus for passive displays evaluates the illumination of an input scene and incorporates data representative of such input scene within a transfer media. The transfer media may be a broadcast or transmission of image data, illumination data and gamma information that can be received by a display system, which includes a passive display illuminated by incident light, to display images while adjusting the incident light and/or gamma based on the received data to reduce energy requirements, to increase contrast or shades of gray in the displayed image, and to optimize light source operation for color fidelity. The data may be provided as a video signal, modulated video signal, s-video signal, digital signal, or other signal that can be used by a passive display system to display images.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: January 30, 2018
    Assignee: Fergason Licensing LLC
    Inventor: James L. Fergason
  • Patent number: 9792870
    Abstract: Provided is a liquid crystal display device, including: a plurality of scanning connection lines formed on at least one side of edges of the image display region, the plurality of scanning connection lines connecting together a scanning signal drive circuit and a plurality of scanning signal lines; a selection circuit formed so as to be interposed between the plurality of scanning connection lines and the plurality of scanning signal lines, the selection circuit being configured to selectively short-circuit one of a plurality of the scanning signal lines to one of the plurality of scanning connection lines based on a selection signal; and a selection signal line connected to the selection circuit, the selection signal line transmitting the selection signal to the selection circuit.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: October 17, 2017
    Assignee: Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Genshiro Kawachi, Kazuo Kita
  • Patent number: 9728114
    Abstract: The present invention relates to liquid crystal display manufacturing technology. There provides a display drive signal compensating method, comprising the steps of: acquiring an original drive signal of every row of input pixels in a display; determining a position of the row of input pixels, based on the original drive signal; generating a compensation signal for compensating the original drive signal, based on a transmission line internal resistance at the position of the row of input pixels; and outputting a superposed signal obtained by superposing the compensation signal on the original drive signal to the row of input pixels. This method can compensates a voltage drop of the drive signal resulted by the transmission line internal resistance and thus improves the display effect. Meanwhile, there also provide a display drive signal compensating device for carrying out the abovementioned method, and correspondingly, a display comprising such device.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: August 8, 2017
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Tuo Sun
  • Patent number: 9728127
    Abstract: A pixel includes a driving circuit, a first organic light emitting diode, a second organic light emitting diode, and a self-repair circuit. The driving circuit supplies current based on a data signal supplied through a data line. The first organic light emitting diode is coupled to the driving circuit through a first current path. The second OLED is coupled to the driving circuit through a second current path. The self-repair circuit interrupts the first current path and supplies the current to the second current path when the first organic light emitting diode has a defect.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: August 8, 2017
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hai-Jung In, Yong-Sung Park
  • Patent number: 9390666
    Abstract: A display device capable of driving at low speed includes a display panel, on which display lines each including a plurality of pixels are formed, a driver unit for driving the pixels, and a timing controller which controls an operation of the driver unit and includes a first control logic unit and a second control logic unit. When a mode conversion control signal of an on-level is input during a normal drive, in which a length of one frame is set to P, the first control logic unit expands a length of one frame for a low speed drive to (n×P), where n is a positive integer equal to or greater than 2, assigns a length P to each of n sub-frames included in the one frame for the low speed drive, and controls the operation of the driver unit in an interlaced low speed driving scheme.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: July 12, 2016
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Daeseok Oh, Bogun Seo, Yonghwa Park, Moonsoo Chung
  • Patent number: 9155157
    Abstract: An electroluminescent device (9) for emitting light (7) whose color point is able to be set variably, comprising at least two electroluminescent regions (41, 42) that, to allow the same operating voltage to be applied, are arranged to be connected in parallel electrically, wherein the electroluminescent regions (41, 42) comprise—at least one first electroluminescent region (41) of a first electroluminescent material for emitting light in a first spectral band in accordance with a first luminance vs. voltage characteristic (81), and—at least one second electroluminescent region (42) of a second electroluminescent material for emitting light in a second spectral band that is not the same as the first spectral band, in accordance with a second luminance vs. voltage characteristic (82) that is not the same as the first luminance vs. voltage characteristic (81).
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: October 6, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Hans-Peter Loebl, Volker Van Elsbergen, Edward Willem Albert Young
  • Patent number: 9123258
    Abstract: An interface apparatus (1600A) comprises a surface (1642) touchable by a finger (120). The surface has a touch-sensitive area with a predetermined position (1646), to which a function is assigned. The finger's presence at the predetermined position (1646) is detected. An electrosensory stimulus is generated to the finger by applying an alternating electrical drive to one or more electrodes (1662). Each electrode is provided with an insulator, which prevents DC flow from the electrode to the finger and a capacitive coupling over the insulator is formed between the electrode (1662) and the finger (120). The capacitive coupling and electrical drive are dimensioned to produce an electrosensory sensation, independently of mechanical vibration of the electrode. The electrosensory stimulus is varied temporally based on the detected presence or absence of the of the finger (120) near the at least one touch-sensitive area having the predetermined position (1646).
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: September 1, 2015
    Assignee: Senseg Ltd.
    Inventors: Ville Makinen, Petro Suvanto, Jukka Linjama
  • Patent number: 9013372
    Abstract: Disclosed herein is a display apparatus, including: a pixel array section including a plurality of pixels, a writing transistor, a driving transistor, a first switching transistor, a holding capacitor, and a second switching transistor; a first scanning section configured to drive the writing transistor in a unit of a row of the pixels; a second scanning section configured to drive the switching transistors in synchronism with scanning by the first scanning section; and a third scanning section configured to control the second switching transistors to a non-conducting state within a period after the image signal is written by the writing transistor until the signal writing period of the same row of the pixels ends but to a conducting state within any other period.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: April 21, 2015
    Assignee: Sony Corporation
    Inventors: Yutaka Mitomi, Masatsugu Tomida, Katsuhide Uchino
  • Patent number: 8963812
    Abstract: A method and apparatus for displaying a reflective image in response to light emitted from an emissive display is disclosed. An apparatus includes an emissive display, a processor in communication with the emissive display, and an electronic cover proximate to the emissive display. The electronic cover includes a passive display layer having a plurality of passive display elements and a photosensitive layer responsive to emitted light from the emissive display. A method includes forming an emitted light image on the emissive display and exposing the photoconductor layer of the electronic cover to an emitted light image, causing the plurality of passive display elements to form a reflective image on the passive display layer so that the reflective image corresponds to the displayed image.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: February 24, 2015
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Johann E. Junginger, Gregory McGuire, Vladislav Skorokhod
  • Patent number: 8933864
    Abstract: A flat panel display including a plurality of electrically addressable pixels; using a passive matrix on a first substrate, a passivating layer on at least partially around the pixels; a conductive frame on the passivating layer, and a plurality of cold cathode emitters on select portions of the conductive frame within the display, wherein exciting the conductive frame and addressing one of the pixels using the associated passive matrix causes electrons to strike at least one of the pixels and result in the emission of light from those pixels. Using a metal layer (ML) on a second substrate the extent of electrons emitted is enhanced through the incorporation of a noble gas or mixture thereof, causing a multiplication of the electrons emitted by the cold cathode when the gas is ionized.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: January 13, 2015
    Assignee: CopyTele, Inc.
    Inventors: Frank J. DiSanto, Denis Krusos
  • Patent number: 8698785
    Abstract: An image adjusting apparatus is provided for adjusting the color of an image. The image adjusting apparatus includes a converting module, a processing module, an output module, a display module, a measuring module and a computing module. The converting module converts an input image into an image signal. The processing module is coupled with the converting module for adjusting the image signal and generating an output signal according to a gain value. The output module is coupled with the processing module for generating an output image according to the output signal. The display module is coupled with the output module for displaying the output image. The measuring module is coupled with the display module for measuring the output image and generating a measurement. The computing module is coupled with the measuring module and the processing module for generating the gain value according to the measurement.
    Type: Grant
    Filed: February 1, 2008
    Date of Patent: April 15, 2014
    Assignee: Princeton Technology Corporation
    Inventors: Chun-Ming Cheng, Tsung-Hsiang Huang
  • Patent number: 8576258
    Abstract: For improving the brightness decay of a display due to its aging, a non-volatile memory such as Flash can be used to store a brightness accumulation value of each point of the display, and each point can be compensated for its brightness accordingly. However, the non-volatile memory suffers from incorrect write-in data or temporary power disconnection, and thus the error will exist all the time to make the display non-even. Hence, the present invention uses a multiple data backups and CRC error detection, plus new/old data comparison to protect data the non-volatile memory from incorrect brightness compensation value so as to uniform the brightness of the display.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: November 5, 2013
    Assignee: Holtek Semiconductor Inc.
    Inventors: Tzong-Kwei Chen, Chun-Lin Shen, Yi-Chen Liu, Chen-Ting Kuan
  • Patent number: 8576145
    Abstract: A method for controlling an electroluminescent display to produce an image for display that has reduced luminance to reduce burn-in on the display while maintaining visible contrast, includes providing the electroluminescent (EL) display having a plurality of EL emitters, the luminance of the light produced by each EL emitter being responsive to a respective drive signal; receiving a respective input image signal for each EL emitter; and transforming the input image signals to a plurality of drive signals that have a reduced peak frame luminance value but maintains contrast in the displayed image to reduce burn-in by adjusting the drive signals to have reduced luminance provided by each pixel with the luminance decrease in a shadow range being less than the luminance decrease in a non-shadow range.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: November 5, 2013
    Assignee: Global OLED Technology LLC
    Inventors: Michael E. Miller, Christopher J. White
  • Patent number: 8547299
    Abstract: Provided is a pulse drive-type field emission device. The pulse drive-type field emission device includes anode and cathode substrates that are spaced apart from and face each other, a cathode electrode formed on the cathode substrate, and a field emitter formed on the cathode electrode. The pulse drive-type field emission device further includes a metal mesh-type gate electrode having an opening through which electrons emitted from the field emitter pass and a power source which applies a compensated pulse wave power to the gate electrode or the cathode electrode to compensate for vibration of the gate electrode. Thus, noise from the metal mesh can be prevented without additional fabrication processes by modifying a waveform in pulse driving.
    Type: Grant
    Filed: October 7, 2009
    Date of Patent: October 1, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin Woo Jeong, Yoon Ho Song
  • Publication number: 20130176349
    Abstract: A display device and a method of driving such a display device including a display module and a DC-DC converter provided outside the display module to supply first and second power source voltages to the display module. The display module includes a gamma voltage generator for generating a plurality of gamma voltages from a first driving voltage and a second driving voltage and a driving voltage varying unit for correcting the first driving voltage and the second driving voltage based on a change in the first power source voltage.
    Type: Application
    Filed: March 27, 2012
    Publication date: July 11, 2013
    Inventors: Jung-Kook Park, Jae-Yong Kim, Byung-Hoon Chae, Joong-Yong Lee, Si-Baek Pyo
  • Patent number: 8390538
    Abstract: A field emission pixel includes a cathode on which a field emitter emitting electrons is formed, an anode on which a phosphor absorbing electrons from the field emitter is formed, and a thin film transistor (TFT) having a source connected to a current source in response to a scan signal, a gate receiving a data signal, and a drain connected to the field emitter. The field emitter is made of carbon material such as diamond, diamond like carbon, carbon nanotube or carbon nanofiber. The cathode may include multiple field emitters, and the TFT may include multiple transistors having gates to which the same signal is applied, sources to which the same signal is applied, and drains respectively connected to the field emitters. An active layer of the TFT is made of a semiconductor film such as amorphous silicon, micro-crystalline silicon, polycrystalline silicon, wide-band gap material like ZnO, or an organic semiconductor.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: March 5, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yoon Ho Song, Dae Jun Kim, Jin Woo Jeong, Jin Ho Lee, Kwang Yong Kang
  • Patent number: 8319709
    Abstract: A display device of the invention includes a display panel attached to one face side of a light transmissive circuit board and a light transmissive substrate attached to the other face side of the circuit board. A mounted component is mounted on the other face side of the circuit board. The circuit board includes a light transmissive junction layer for joining the circuit board to the light transmissive substrate at a position avoiding the mounted component. The junction layer includes a core substrate formed of a resin, an adhesive layer formed on one face of the core substrate, and a bonding layer formed on the other face of the core substrate and cured. The adhesive layer is adhered to the circuit board, and the bonding layer is firmly fixed to the light transmissive substrate.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: November 27, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hiroshi Ito, Kazunori Ojima, Hideaki Abe, Shinji Tanabe, Masayuki Yanagihara
  • Patent number: 8223101
    Abstract: A flat panel display is disclosed. The flat panel display includes a plurality of electrically addressable pixels, a plurality of thin-film transistor driver circuits each been electrically coupled to an associated at least one of the pixels, respectively, a passivating layer on the thin-film transistor driver circuits and at least partially around the pixels, a conductive frame on the passivating layer, and a plurality of nanostructures on the conductive frame, wherein, creating a voltage difference between the pixels and the conductive frame by addressing one of the pixels using the associated driver circuit causes the nanostructures to emit electrons that induce a corresponding one of the pixels to emit light.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: July 17, 2012
    Assignee: Copytele, Inc.
    Inventors: Frank DiSanto, Denis Krusos
  • Patent number: 8212487
    Abstract: Provided are a field emission device enabling rapid pulse operation and a method of operating the same. The field emission device includes a cathode electrode including a field emission source, an anode electrode disposed to face the cathode electrode and accelerating electrons emitted from the field emission source, a current controller controlling field emission current flowing through the cathode electrode, and a field emission controller applying a pull-up voltage to the cathode electrode when the current controller is turned off.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: July 3, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin Woo Jeong, Yoon Ho Song, Jae Woo Kim
  • Patent number: 8120550
    Abstract: The present invention relates to a display device that employs edge emitters as a source for pixel electrons. The edge emitters allow the viewing glass plate to be made very small or eliminated, thereby substantially reducing the size of or eliminating the spacers typically utilized in conventional display devices and thereby enabling a simple and compact assembly structure. In one embodiment a pixel configuration comprises a phosphor area disposed between a plurality edge emitters, each of which are associated with tynes that are adapted to reduce the distance between the emitters and that separate the phosphor area into segments such that the emitters emit electrons when the voltage between a phosphor segment and the an emitter exceed a threshold voltage to cause the phosphor segment to emit light.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: February 21, 2012
    Assignee: Copytele, Inc.
    Inventors: Frank J. DiSanto, Denis A. Krusos
  • Patent number: 8085224
    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 30, 2008
    Date of Patent: December 27, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Izumi Kanai, Hisanobu Azuma
  • Patent number: 8068070
    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: March 5, 2009
    Date of Patent: November 29, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Yui, Akira Hayama
  • Patent number: 8054249
    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: Grant
    Filed: November 27, 2006
    Date of Patent: November 8, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yoon Ho Song, Dae Jun Kim, Jin Woo Jeong, Jin Ho Lee, Kwang Yong Kang
  • Patent number: 8049683
    Abstract: There is provided a driving circuit capable of driving current flowing in cathode electrodes with high accuracy and displaying without brightness variation. For driving a cathode electrode in a display panel, a first current mirror circuit is fabricated by connecting a gate of first FET and a gate of second FET and a second current mirror circuit is fabricated by connecting a gate of a third FET connected in series to the second FET and a gate of a fourth FET. A brightness signal controls the magnitude of current flowing in the first FET, so that the current flowing to the cathode electrode via the fourth FET can be controlled with high accuracy.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: November 1, 2011
    Assignee: Futaba Corporation
    Inventor: Terukazu Sugimoto
  • Patent number: 7995851
    Abstract: A method of and an apparatus for image enhancement taking ambient illuminance into consideration. The image enhancement method includes calculating an original-luminance contrast which is a luminance contrast with respect to an original-luminance of pixels forming an original image, calculating a fade-luminance by reflecting the variation of perceived luminance based on an ambient illuminance into the original-luminance, calculating a defade-luminance by converting the fade-luminance to maintain the original-luminance contrast, and calculating a display-luminance by reflecting the variation of perceived luminance by the ambient illuminance into the defade-luminance. Improving luminance contrast through adjustment of luminance based on ambient illuminance, effectively reduces the fade phenomenon.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: August 9, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seong-deok Lee, Chang-veong Kim, Dmitry Lebedev, Galina Rozhkova, Vladmir Bastakov, Young-Shin Kwak
  • Patent number: 7973742
    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: Grant
    Filed: May 2, 2007
    Date of Patent: July 5, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chan-Wook Baik, Jeong-Hee Lee, Jeong-Na Heo, Deuk-Seok Chung, Tae-Won Jeong, Kyoung-Won Min
  • Patent number: 7944457
    Abstract: An image display method adapted for a digital display apparatus is provided. The image display method includes the steps of: first, detecting a maximum average picture level of each picture displayed by the digital display apparatus; judging whether the maximum average picture level is larger than a reference value; determining a displaying mode of each picture according to the judgment. The image display method is adapted for improving the displaying quality of a digital display apparatus.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: May 17, 2011
    Assignee: Coretronic Corporation
    Inventors: Tzung-I Lin, Yi-Chun Lu, Chia-Yin Lu
  • Patent number: 7924243
    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: April 21, 2006
    Date of Patent: April 12, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Izumi Kanai, Yukio Hiraki, Makiko Mori, Kohei Inamura, Masaru Tada, Toshiyuki Kanda, Tatsuro Yamazaki
  • Publication number: 20110007062
    Abstract: A display panel and a driving method thereof are disclosed. The display panel comprises a plurality of pixel rows, a plurality of data lines and a plurality of gate lines. Each of the pixel rows includes pairs of first and second pixels adjacent to each other. The data lines are positioned between the first and the second pixels, respectively. The gate lines include first, second, third and fourth gate lines arranged in an alternating manner. The method comprises the following steps: turning on the gate lines in a sequence of first, second, fourth and third gate lines; and transmitting the data signal to the pixels through the data lines. The panel is applicable to an LCD panel and an LCD apparatus.
    Type: Application
    Filed: October 13, 2009
    Publication date: January 13, 2011
    Applicant: CHUNGHWA PICTURE TUBES, LTD.
    Inventors: SHU-MING CHANG, MING-WEI HUANG, HSIANG-LUN LIU
  • Patent number: 7863823
    Abstract: A method of improving uniformity of brightness between pixels in an electron emission panel includes respectively applying a scan driving voltage and a data driving voltage to a scan electrode and a data electrode of each of a plurality of pixels, wherein one of the scan driving voltage and the data driving voltage is higher than the other; measuring a brightness of each of the pixels; and respectively applying a scan adjustment voltage and a data adjustment voltage to the scan electrode and the data electrode of each of the pixels based on the measured brightness of a respective one of the pixels, wherein a higher one of the scan adjustment voltage and the data adjustment voltage is applied to a same one of the scan electrode and the data electrode to which a lower one of the scan driving voltage and the data driving voltage is applied.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: January 4, 2011
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Ji-Hong Lim
  • Patent number: 7855500
    Abstract: An electron emission display that can mitigate or prevent problems of an arc discharge and a wire disconnection due to increases in resistance at portions where a sealing member contacts electrodes includes: an electron emission device on which upper surfaces of electrodes are exposed, a front panel that is disposed in front of the electron emission device, the front panel being of a phosphor material, and a sealing member that seals a space formed by the electron emission device and the front panel by being disposed on the edges of the space in contact with the electrodes. The electrodes are formed on an entire surface of the electron emission device with a narrow width at an end portion of the electron emission device where the electrodes are connected to an external power source, and the sealing member contacts the electrodes closer to the space than end portions of the electrodes where the width of the electrodes is narrowed.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: December 21, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Jae-Sang Ha
  • Patent number: 7834308
    Abstract: An imaging apparatus includes an electron emission array having electron sources arranged in matrix form and having a plurality of horizontal scan lines, a photoelectric conversion film opposed to the electron emission array, and a control and drive circuit configured to select one or more of the horizontal scan lines in a given video signal output period and to cause the electron sources included in the selected one or more horizontal scan lines to emit electrons toward the photoelectric conversion film to produce a video signal, wherein the control and drive circuit is configured to cause the electron sources included in unselected one or more horizontal scan lines not selected in the given video signal output period to emit electrons toward the photoelectric conversion film in a blanking period immediately preceding the given video signal output period.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: November 16, 2010
    Assignees: Nippon Hoso Kyokai, Hamamatsu Photonics K.K., Futaba Corporation, Pioneer Corporation
    Inventors: Masakazu Namba, Yuki Honda, Yoshiyuki Hirano, Saburo Okazaki, Norifumi Egami, Toshihisa Watabe, Yoshiro Takiguchi, Akira Kobayashi, Shigeo Itoh, Masateru Taniguchi, Kazuhito Nakamura, Kenta Miya, Yoshiyuki Okuda, Nobuyasu Negishi
  • Patent number: 7830339
    Abstract: An image display apparatus includes a rear plate having electron-emitting devices, a face plate having light-emitting regions, a spacer arranged between the rear plate and the face plate, and a drive circuit having a correction circuit which corrects input image data. A quantity of light emitted from an object light-emitting region depends on the quantity of electrons coming from a corresponding object electron-emitting device and coming from peripheral light-emitting regions of the object light-emitting region, and the quantity of light emitted from the object light-emitting region decreases when at least some of the emitted electrons are blocked by the spacer.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: November 9, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hideaki Yui
  • Patent number: 7825877
    Abstract: To provide a highly reliable display device whose electrical element is applied with a low voltage. The display device is an active matrix FED display device whose pixel has an individual extraction gate electrode, an emitter array, a driving transistor which is connected to the emitter array in series, a potential control circuit which controls the potential of the extraction gate electrode, and a circuit which includes a switching element and a voltage holding element. By varying the potential of the extraction gate electrode in accordance with Vgs of the driving transistor, the active matrix driving method is performed by connecting a driving transistor to the emitter array in series and voltage which is applied to the driving transistor can be reduced.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: November 2, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Yasunori Yoshida
  • Patent number: 7812792
    Abstract: An electron emission display device and a control method of the same. The electron emission display device includes a display region having a plurality of scanning lines and a plurality of data lines; a plurality of pixels arranged in regions defined by the scanning lines and the data lines; a data driving unit for transmitting a data signal to the data lines; a scanning driving unit for transmitting a scanning signal to the scanning lines; and a controlling unit for identifying display data for indicating a brightness displayed by the pixels, and correcting the input data input into the pixels using compensation coefficients corresponding to the pixels. In this electron emission device, the input data is corrected in the controlling unit by multiplying the compensation coefficients by the input data.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: October 12, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Ji Won Lee
  • Patent number: 7812791
    Abstract: An electron emission display and a driving method thereof adjust a brightness differently according to a brightness of a frame in order to reduce power consumption and prevent a gradual failure from occurring, and easily recognize a change of the brightness. A pixel portion receives a data signal and a scan signal, and displays an image. A data driver generates the data signal using video data and transfers the data signal to the pixel portion. A scan driver transfers the scan signal to the pixel portion. A timing controller transfers a drive signal to drive the data driver and the scan driver, to the data driver and the scan driver. A data processor generates a control signal corresponding to frame data obtained by summing a value of video data inputted during one frame. A power supply section generates a drive voltage and transfers the drive voltage to the pixel portion, the data driver, the scan driver, the timing controller, and the data processor.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: October 12, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Dong Hyup Jeon
  • Patent number: 7777697
    Abstract: An electron emission display and a driving method thereof, where a brightness is adjusted differently according to a brightness of a frame in order to reduce power consumption and prevent a brazing fire from occurring, and to easily recognize a change of the brightness.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: August 17, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Dong Hyup Jeon, Chul Ho Lee
  • Patent number: 7750872
    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: Grant
    Filed: January 18, 2007
    Date of Patent: July 6, 2010
    Assignee: Sony Corporation
    Inventors: Yukinobu Iguchi, Hiroyuki Ikeda, Yasuhito Hatano, Kunihiko Nagamine
  • Patent number: 7727039
    Abstract: A method of aging a field emission device including a cathode and an anode arranged parallel to each other, an emitter arranged on the cathode to emit electrons to the anode, and a gate electrode arranged on the cathode adjacent to the emitter, the method including: supplying a voltage to the cathode; supplying a voltage to the gate; and then supplying a sufficiently low voltage to the anode so as to prevent a short-circuited portion between the cathode and the gate electrode from being permanently damaged due to an overcurrent.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: June 1, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chan-wook Baik, Sun-il Kim, Deuk-seok Chung, Byong-gwon Song, Min-jong Bae
  • Patent number: 7723664
    Abstract: An imaging apparatus includes an electron emission array having electron sources arranged in matrix form and having a plurality of horizontal scan lines, a photoelectric conversion film opposed to the electron emission array, and a control and drive circuit configured to select one or more of the horizontal scan lines in a given video signal output period and to cause the electron sources included in the selected one or more horizontal scan lines to emit electrons toward the photoelectric conversion film to produce a video signal, wherein the control and drive circuit is configured to control electron emission of the electron emission array in a blanking period in response to a signal level of the video signal produced in the given video signal output period.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: May 25, 2010
    Assignees: Nippon Hoso Kyokai, Hamamatsu Photonics K.K., Futaba Corporation, Pioneer Corporation
    Inventors: Yuki Honda, Masakazu Namba, Yoshiyuki Hirano, Saburo Okazaki, Norifumi Egami, Toshihisa Watabe, Yoshiro Takiguchi, Akira Kobayashi, Shigeo Itoh, Masateru Taniguchi, Kazuhito Nakamura, Kenta Miya, Takahiro Niiyama, Yoshiyuki Okuda
  • Patent number: 7710363
    Abstract: A method of controlling display of a grey level at an associated image point on a matrix display screen. The screen includes lines and columns for which the intersections form an image point. Samples with non-linear proportional light intensity are used to display grey levels, instead of using samples with linear proportional light intensity, by selecting a coding that matches the response curve of the human eye because the eye is more sensitive to brightness differences at a low illumination level than at a high level. Its perception of brightness follows a non-linear law called the gamma correction law which in particular has been modelled by the International Lighting Commission (ILC).
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: May 4, 2010
    Assignee: Commissariat a L'Energie Atomique
    Inventor: Denis Sarrasin
  • Patent number: 7710362
    Abstract: An electron emission display (EED) includes an anode and a panel electrode unit comprising a scan electrode that extends in one direction of a lattice type panel and a data electrode that extends across the scan electrode. In the display and a method of driving the same, when power is supplied to the electron emission display, an anode voltage is applied to drive the anode, and a voltage is applied to at least one electrode of the panel electrode unit when the anode voltage is equal to or higher than a reference voltage.
    Type: Grant
    Filed: June 14, 2005
    Date of Patent: May 4, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Duck-Gu Cho
  • Patent number: 7696959
    Abstract: Scan electrode potential detected by a feedback switch is inputted into a negative-phase input terminal of an amplifier, reference selection potential from a reference-selection-potential-signal generation circuit is inputted into a positive-phase input terminal of the amplifier, and the reference-selection-potential-signal generation circuit delays reference potential of a reference voltage source, thereby scan electrode potential without overshooting components can be achieved.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: April 13, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hiroyuki Nitta, Masahisa Tsukahara, Toshifumi Ozaki
  • Publication number: 20100085390
    Abstract: A device that carries a panel comprising a back panel with wirings and electron emitting devices provided in intersection portions of the wirings and a face plate with formed therein cells comprising a fluorescent material that emits light, and in which gradation control is performed by varying an application time of a drive voltage that is applied to the electron emitting devices, wherein a line selection time is longer than 1 ?s and the fluorescent material comprises a substance represented by a general formula Me2Si5N8:Eu2+ (Me is Ca or Sr).
    Type: Application
    Filed: October 2, 2009
    Publication date: April 8, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Shoshiro Saruta
  • Patent number: 7679584
    Abstract: An EED capable of reducing noise influence between a high voltage element and a low voltage logic element in an EED panel includes: a high voltage ground for a high voltage element, a low voltage ground for a low voltage element, and a ferrite bead, connected between the high voltage ground and the low voltage ground, to block RF noise from the high voltage ground.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: March 16, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Dong-Hyup Jeon
  • Patent number: 7652644
    Abstract: An electron emission display for improving brightness uniformity by compensating brightness deviation between respective elements. The electron emission display includes a display panel, a scan driver, a data driver, and a brightness compensator. The display panel includes a plurality of scan electrodes, a plurality of data electrodes, and a plurality of display elements respectively formed at crossing points of the scan electrodes and the data electrodes. The display elements respectively include an electron emitter. The scan driver applies a selection signal to the scan electrode. The data driver applies a data signal to the data electrode. The brightness compensator compensates brightness by changing the data signal when brightness deviation of the display elements is greater than a predetermined threshold value.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: January 26, 2010
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Byong-Gon Lee, Chun-Gyoo Lee, Chul Ho Lee
  • Publication number: 20090309814
    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: Application
    Filed: August 11, 2009
    Publication date: December 17, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Akira Hayama, Hideaki Yui