Electroluminescent Display Elements Patents (Class 345/36)
  • Patent number: 7221339
    Abstract: A display apparatus, that includes current driving type luminescent elements, has a driving system that takes the conduction types of TFTs to control the emission of the luminescent elements into consideration. In order to reduce driving voltage and improve display quality simultaneously, the arrangement is provided such that if the second TFT which performs the “on-off” function of the current for the luminescent element is of an N channel type, the potential of the common power supply line (“com”) is lowered below the potential of the opposite electrode (“op”) of the luminescent element to obtain a higher gate voltage (“Vgcur”).
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: May 22, 2007
    Assignee: Seiko Epson Corporation
    Inventors: Tokuroh Ozawa, Mutsumi Kimura
  • Patent number: 7221333
    Abstract: A display panel comprises a plurality of arranged pixels of organic EL devices, each having a pair of electrodes and a luminescent layer containing an organic EL material and sandwiched between the electrodes. The plurality of arranged pixels include fluorescent pixels of organic EL devices formed by mainly using a fluorescent material and phosphorescent pixels of organic EL devices formed by mainly using a phosphorescent material. A display apparatus comprises a controller for controlling the display panel, including correcting the difference between the electroluminescent characteristics of the fluorescent pixels and those of the phosphorescent pixels.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: May 22, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Osamu Yuki
  • Patent number: 7212193
    Abstract: A method for driving a display is provided which is capable of reducing current consumption. In the method above, a scanning frequency in a self-emissive display is changed based on a display content to be displayed in the self-emissive display.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: May 1, 2007
    Assignee: NEC Corporation
    Inventor: Hideki Ueda
  • Patent number: 7198393
    Abstract: A conformable vehicle display includes a flexible display screen coupled to a substrate. The substrate is a curved transparent substrate that is adapted to be coupled to a vehicle component having a curved exterior surface. The flexible display screen is at least partially separate from the exterior surface of the vehicle component and has a luminescent display. The exterior surface of the vehicle component is visible through the flexible display screen and the substrate when the flexible display screen is not activated. The flexible display screen may be a transparent organic light emitting diode display device.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: April 3, 2007
    Assignee: Johnson Controls Technology Company
    Inventors: Athanassios L. Tubidis, James J. Farber, John Krsteski, Ted W. Ringold, Samuel Centellas
  • Patent number: 7193625
    Abstract: A method for addressing a bistable electro-optic display having at least one pixel comprises applying an addressing pulse to drive the pixel to a first optical state; leaving the pixel undriven for a period of time, thereby permitting the pixel to assume a second optical state different from the first optical state; and applying to the pixel a refresh pulse which substantially restores the pixel to the first optical state, the refresh pulse being short relative to the addressing pulse.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: March 20, 2007
    Assignee: E Ink Corporation
    Inventors: Guy M. Danner, Karl R. Amundson, Robert W. Zehner, Alexi C. Arango, Jay Britton Ewing
  • Patent number: 7129914
    Abstract: An active matrix electroluminescent display device has an array of pixels (10), each pixel having a plurality of current-driven display elements (11a–d), for example comprising organic electroluminescent material, connected in a series arrangement with one another and with drive means (12) operable to control the current through the respective series arrangement. By sub-dividing each pixel in this way, the high voltage drops, that can occur along power supply lines, are reduced thus improving the uniformity of the light outputs from the display elements across the display area.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: October 31, 2006
    Assignee: Koninklijke Philips Electronics N. V.
    Inventors: Alan G Knapp, Iain M. Hunter
  • Patent number: 7119763
    Abstract: A light emitting circuit and a display device capable of providing refresh action to an organic electroluminescence element to which a diode is connected in series, in a comparatively easy structure, in order to improve the average luminance.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: October 10, 2006
    Assignee: Pioneer Corporation
    Inventor: Yoshiyuki Okuda
  • Patent number: 7106283
    Abstract: A device for driving a dot matrix display panel has a number of first terminals that can be connected to different signal lines in the dot matrix display panel, to carry current to or from picture elements in the dot matrix display panel. The invented device also has a second terminal and a set of switches that can selectively connect the first terminals to the second terminal. These switches enable a measurement device connected to the second terminal to measure electrical parameters at the first terminals individually, so that the electrical parameters of the device can be tested efficiently and accurately, without having to contact each of the first terminals with a probe.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: September 12, 2006
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Shinichi Satoh
  • Patent number: 7098905
    Abstract: A drive circuit of an active matrix type organic EL display panel includes a plurality of current drive circuits provided correspondingly to data lines or column pins of the display panel, a plurality of pixel circuits, each of which includes a capacitor and an organic EL element, and a write control circuit. The current drive circuit includes an output pin connected to the data line or the column pin and generates a current for charging the capacitor to a predetermined voltage through the data line or the column pin and a current for initially charging the organic EL element. The write control circuit performs a write control for storing the voltage in the capacitor and a resetting control for of the capacitor written with the voltage.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: August 29, 2006
    Assignee: Rohm Co., Ltd.
    Inventors: Shinichi Abe, Masanori Fujisawa
  • Patent number: 7094902
    Abstract: Electroactive polymeric arylenes and intermediates useful for making such polymers are disclosed. The present invention also provides electroactive compositions comprising the electroactive polymeric arylenes, organic electronic devices which comprise these polymers and compositions, and methods of fabricating these devices.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: August 22, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Ralph R. Roberts, James G. Bentsen, Yingbo Li
  • Patent number: 7081871
    Abstract: A light-emitting device including a plurality of emission layers, which has improved luminous efficiency and improved emission lifetime, is provided. In the light-emitting device, a first optical film thickness range L1 from a light-emitting position of a first emission layer to a light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of a second emission layer to the device light-emitting surface, and film thicknesses of a plurality of layers between the light-emitting surface and the first emission layer, the first emission layer and the second emission layer are set so as to increase the luminous intensity of color of an emission produced by mixing an emission from the first emission layer with an emission from the second emission layer.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: July 25, 2006
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Hiroshi Kanno, Yuji Hamada, Kazuki Nishimura
  • Patent number: 7080909
    Abstract: An illumination apparatus which directs light from a light source to an illuminated area. The illumination apparatus comprises a plurality of light emitters as the light source, a lighting unit configured to cause the light emitters to emit light so that the intensities of light emitted by the light emitters can be adjusted, an optical system configured to direct light emitted by the light emitters to the illuminated area, a storing unit configured to store an adjusting amount of the emitted light for changing the intensities of light emitted together with time, and a lighting control unit configured to control the lighting unit based on the adjusting amount of the emitted light stored in the storing unit so that the respective light emitters carry out pulsed emission at different timings. The adjusting amount of the emitted light stored in the storing unit is an adjusting amount so as to change the intensities of light in a pulsed emission period of the respective light emitters.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: July 25, 2006
    Assignee: Olympus Corporation
    Inventor: Shinzo Matsui
  • Patent number: 7075239
    Abstract: There is explained a method and apparatus of driving a plasma display panel that is capable of increasing a driving margin upon a selective writing and a selective erasing in case that not only the selective writing but also the selective erasing are carried out within one frame period. A method of driving a plasma display panel that selects cells in use of selective writing sub-fields and selective erasing sub-fields arranged within one frame period and has a plurality of scanning electrodes, a plurality of sustaining electrodes and a plurality of address electrodes, according to an embodiment of the present invention includes steps of selecting an on-cell by generating a writing discharge in use of a first scanning voltage in the selective writing sub-fields; and selecting an off-cell by generating an erasing discharge in use of a second scanning voltage in the selective erasing sub-fields.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: July 11, 2006
    Assignee: LG Electronics Inc.
    Inventors: Seong Ho Kang, Jang Hwan Cho, Gop Sick Kim, Eung Gwan Lee
  • Patent number: 7042163
    Abstract: An organic electroluminescence display includes a substrate and a plurality of light emitting parts formed on the substrate, each of the light emitting parts including an organic electroluminescence device and an organic thin film transistor connected to the organic electroluminescence device. The organic electroluminescence device has a pair of opposed electrodes and an organic material layer including an organic light-emitting layer laminated between the pair of electrodes. The organic thin film transistor has a source electrode and a drain electrode opposed to each other, an organic semiconductor film laminated so as to form a channel between the source electrode and the drain electrode, and a gate electrode for applying a field to the organic semiconductor film between the source electrode and the drain electrode.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: May 9, 2006
    Assignee: Pioneer Corporation
    Inventor: Kenichi Nagayama
  • Patent number: 7034782
    Abstract: A display panel driving device that can obviate the need for constant current driving circuits in an anode driver circuit, in which a light emission column electrode lines is opened in a light emission period during scanning of each line of a display panel, and parasitic capacitors of light emitting elements are used to allow leak current from the combined parasitic capacitors of the non-scanned elements to the scanned elements to serve as the light emission current of the scanned elements.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: April 25, 2006
    Assignee: Pioneer Corporation
    Inventors: Junichi Miyakawa, Masaru Sasaki, Takeshi Higuma, Hiroyuki Kazama
  • Patent number: 7027013
    Abstract: An electroluminescent display and driving method is provided wherein the rows of pixels are divided into sub-pixel sets and several different sets of sub-pixels are then addressed from within a larger superset of adjacent sub-pixels. The image data for the addressed sub-pixels is averaged with that for adjacent sub-pixels and is applied to the reduced number of larger sub-pixels in sequence. Consequently, for a given sequence of input frame data sets the time average over one frame for a portion of the sub-pixels at any location of the panel is substantially the same as that for a conventionally addressed sub-pixel in a prior art panel.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: April 11, 2006
    Assignee: Ifire Technology, Inc.
    Inventors: Kirk Ouellete, Chung-Fai Cheng, Don Carkner, Eiric Johnstone, Xingwei Wu, James Stiles
  • Patent number: 7012600
    Abstract: A bistable electro-optic display has a plurality of pixels, each of which is capable of displaying at least three gray levels. The display is driven by a method comprising: storing a look-up table containing data representing the impulses necessary to convert an initial gray level to a final gray level; storing data representing at least an initial state of each pixel of the display; receiving an input signal representing a desired final state of at least one pixel of the display; and generating an output signal representing the impulse necessary to convert the initial state of said one pixel to the desired final state thereof, as determined from said look-up table. The invention also provides a method for reducing the remnant voltage of an electro-optic display.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: March 14, 2006
    Assignee: E Ink Corporation
    Inventors: Robert W. Zehner, Holly G. Gates, Karl R. Amundson, Joanna F. Au, Ara N. Knalan, Jonathan L. Zalesky, Alexi C. Arango
  • Patent number: 6995893
    Abstract: The invention provides an electro-optical device, a method of manufacturing an electro-optical device, an apparatus for manufacturing an electro-optical device, and an electronic apparatus, in which, in the electro-optical device, a gap formed between two substrates functioning as constituent elements thereof or the thickness of an adhesive layer, which adheres the two substrates to each other, can be precisely controlled. The electro-optical device has at least a substrate and a sealing substrate which is adhered to the substrate and which is composed of a transparent plate member, in which the substrate and the sealing substrate are adhered to each other with an adhesive layer provided therebetween so as to form a gap therebetween; measurement surfaces, used to measure the thickness of the adhesive layer, are provided in the gap; and on the measurement surfaces, an adhesive is not provided.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: February 7, 2006
    Assignee: Seiko Epson Corporation
    Inventor: Hidekazu Kobayashi
  • Patent number: 6991336
    Abstract: An illumination apparatus comprise a light control member configured to perform changing the path of light from light emitters to be directed to an illuminated area and/or moving of the light emitters, a movement unit configured to allow the light control member to operate, and a light selector control unit configured to control the movement unit and/or a lighting unit, which is configured to cause the light emitters to emit light so that the intensities of light emitted by them can be adjusted, so as to select light to be directed to the illuminated area from light of the emitters. The light selector control unit controls the lighting unit to cause an emitter to emit light when it is positioned in the vicinity of a light concentration area of an optical system by the operation of the light control member.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: January 31, 2006
    Assignee: Olympus Corporation
    Inventor: Shinzo Matsui
  • Patent number: 6982687
    Abstract: Data drive circuit for a current writing type AMOEL display panel including a plurality of current output channels, and a plurality of channel current generating circuits on respective current output channels for minimizing a difference of current levels occurred between the current output channels, each inclusive of one pair of transistors, a current generating part for generating a current of a small deviation proportional to square of a difference of threshold voltages of the one pair of the transistors, and a current mirror part for mirroring the current, and forwarding the mirrored current as a channel current for the channel, thereby minimizing a difference of current levels occurred between output channels, and driving the AMOEL display panel uniformly.
    Type: Grant
    Filed: January 6, 2003
    Date of Patent: January 3, 2006
    Assignee: LG Electronics Inc.
    Inventors: Hak Soo Kim, Young Sun Na, Oh Kyoung Kwan
  • Patent number: 6980095
    Abstract: A remote keyless entry electroluminiescent (EL) device includes at least one depressible button segment for activating a vehicle function. The entry device includes an upper housing with at least one aperture in the upper housing. An EL film is integral to the upper housing for illuminating at least one display area. A printed circuit board is disposed under the upper housing. An electrical contact is provided for supplying a power source from the printed circuit board to the EL film for illumination. A lower housing is adjoined to the upper housing, the upper housing and the lower housing encasing the printed circuit board wherein the EL film is in-molded as part of the upper housing for forming a single component.
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: December 27, 2005
    Assignee: Lear Corporation
    Inventors: James B. Wright, Leonard E. Pagano
  • Patent number: 6975290
    Abstract: An active matrix type organic EL display apparatus according to the present invention which apparatus uses current writing type pixel circuits is provided with a current control circuit for each of data lines connected to the pixel circuits. The current control circuit supplies part of a data line current to a pixel circuit as a bypass current. The current control circuit handles the bypass current of the data line current represented by (data line current=data current+bypass current). Thereby, the data line driving current can be set greater than the data current flowing through TFTs provided in the pixel circuit, thus reducing luminance data writing time. Also, when the writing time is set unchanged, transistor size of the TFTs provided in the pixel circuit can be reduced.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: December 13, 2005
    Assignee: Sony Corporation
    Inventor: Mitsuru Asano
  • Patent number: 6960889
    Abstract: This invention relates to a method for driving an electro-luminescence display device. The method includes the steps of selecting a scan line by applying a scan signal to any one of a plurality of scan lines; and switching between a constant voltage and a constant current to apply data to a plurality of data lines crossing the scan lines. The method switches between the constant voltage source and the constant current source to drive the data lines. As a result, it increases the brightness uniformity and brightness. Therefore, the picture quality can be sustained at a high level.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: November 1, 2005
    Assignee: LG Electronics Inc.
    Inventors: Kyung Vin Park, Se Don Kim, Yoon Heung Tak
  • Patent number: 6897837
    Abstract: In the device for voltage driving the self-luminous display element, the self-luminous display element driving device includes a circuit for generating deterioration information concerning a deterioration state of the self-luminous display element, and a circuit for adjusting a voltage applied to the self-luminous display element, on the basis of the deterioration information generated by the deterioration information generating circuit. The deterioration information generating circuit generates the deterioration information on the basis of a time, a luminance, a current value or a voltgage value, etc. The self-luminous display element may be, for example, an EL (electroluminescence) element or an organic EL element.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: May 24, 2005
    Assignee: Seiko Instruments Inc.
    Inventors: Kazumi Sakumoto, Hiroshi Odagiri, Susumu Fujita, Masafumi Hoshino, Tokuya Akase
  • Patent number: 6894672
    Abstract: Compensation, e.g. temperature compensation of the operating voltage of an LCD is obtained by using the V50 point of a test cell via the differentiated AC current (switching current of the test cell as a control parameter).
    Type: Grant
    Filed: March 8, 2001
    Date of Patent: May 17, 2005
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Adolphe Johannes Gerardus Ruigt
  • Patent number: 6885386
    Abstract: The invention provides an animated display in which an illumination source projects light through a platen and a transparency that contains alternative translucent images. The invention involves using an electronic processor to drive two highly controllable motors. Light sensors are used to determine the alignment of a mask over said transparency relative to the light source. The sensors provide input to the processor to allow the two motors to align the mask horizontally. The motors are used to drive the mask vertically in order to change the projected image. In a second embodiment, the lens is a lenticular lens behind the translucent raster multiple image film. A motor acts to drive the mask to align the opaque or image portions of the raster to the focusing portion of the lenticular lens. A lenticular lens may focus on the image line for one of the images on the film.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: April 26, 2005
    Inventor: Richard L. Weinbrenner
  • Patent number: 6842170
    Abstract: A display (200) with aligned optical shutter and backlight cells (239, 289) uses a patterned polymer-dispersed liquid crystal (PDLC) optical shutter material (230) and an electroluminescent (EL) backlight material (280) to provide a low-cost, low-current-drain display having good contrast in both bright-light and low-light conditions. The aligned, patterned optical shutter and backlight layers form pixel “windows” through which images printed on a background can be hidden or revealed. Specifically, a mask layer (250) bears the images and is inserted between the optical shutter and the backlight layers to show information images, cover inactive areas of the display, and cover electrode traces connecting active segments of the display. The display (200) is thin and flexible enough to be integrated with a touchscreen (290).
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: January 11, 2005
    Assignee: Motorola, Inc.
    Inventors: Robert B. Akins, Ken Paitl, George M. Ventouris, Michael L. Charlier
  • Patent number: 6839056
    Abstract: A driving circuit in a display apparatus includes a current driving unit for supplying a driving current in a forward direction to a light emitting element based on control data. The current driving unit is furnished with a function of supplying a predetermined current in a reverse direction to the light emitting element. The driving circuit further includes a voltage comparing unit for judging whether a reverse voltage necessary to supply the predetermined current in the reverse direction is smaller than a predetermined voltage. The driving circuit notifies an abnormal condition of the light emitting element based on a judgment by the voltage comparing unit. Consequently, it is possible to detect a light emitting element generating a leak current in a reverse direction of the light emitting element even when the light emitting element is connected to the driving circuit.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: January 4, 2005
    Assignee: Nichia Corporation
    Inventors: Yoshifumi Nagai, Ryuhei Tsuji
  • Patent number: 6838836
    Abstract: To provide a light emitting element having a top emission structure, which can be easily manufactured without considering an ionization potential of an electrode (particularly an electrode in contact with a substrate) and a manufacturing method therefor. A light emitting device having the top emission structure according to the present invention includes: a first electrode (101) formed of general-purpose metal (specifically, a wiring material such as Ti or Al) having a light-shielding property or reflectivity; a conductive polymer layer (102) formed by applying a conductive polymer material onto the first electrode (101); an electroluminescence film (103) formed in contact with the conductive polymer layer (102); and a light-transmissive second electrode (104) formed on the electroluminescence film 103, in which the conductive polymer layer (102) is formed of materials including a redox polymer etc., while being free of problems regarding work function (as shown in FIG. 1A).
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: January 4, 2005
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Satoshi Seo, Hiroko Yamazaki
  • Patent number: 6831627
    Abstract: A liquid crystal display includes an electro-luminescence portion which has electro-luminescence elements and a liquid crystal portion which has liquid crystal layer, scanning electrodes and signal electrodes and controls the transmittance of light emitted by the electro-luminescence elements. First, scanning pulses are applied in sequence to the scanning electrodes. Next, a gradation signal are applied associated with image data to the signal electrodes. Then, the electro-luminescence portion is allowed to emit light of a plurality of colors at the same time in pixels after transmissivity of the liquid crystal layers in the pixels reaches a predetermined value. The pixels are located at the intersections between a scanning electrode to which the scanning pulse is applied and the signal electrodes to which the gradation signal is applied.
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: December 14, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Fumio Hasegawa, Makoto Aoki
  • Patent number: 6809709
    Abstract: The invention provides an organic electro-luminescence device which can be used as a cover glass of a wristwatch or the like by virtue of its transparency, produces a plurality of colors, illuminates and displays at the same time, and is formed by an easy method. A transparent organic EL device emitting yellow light is formed on a first surface of a substrate by being patterned so as to display characters. A transparent organic EL device emitting blue light is formed on a second surface by being patterned so as to generate light at the overall surface of the substrate.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: October 26, 2004
    Assignee: Seiko Epson Corporation
    Inventors: Masahiro Uchida, Osamu Yokoyama
  • Patent number: 6788298
    Abstract: A driving circuit of a display to display full color by light emitting elements is provided which can attain sufficient display characteristics even when there is a difference in characteristics of the light emitting elements and can lower power consumption. The driving circuit is used for a stripe type display in which electrical characteristics of a red light emitting organic EL (Electroluninescence) element differ greatly from those of green and blue light emitting organic EL elements in which these three light emitting elements are arranged repeatedly in a column direction in a manner that the red light emitting element is sandwiched by the green and blue light emitting elements and the driving circuit is made up of driving sections each having driving capability enough to drive the red light emitting organic EL element and other driving sections each having driving capability enough to drive the green and blue light organic EL elements.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: September 7, 2004
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Atsushi Kota, Shingo Kawashima, Eitaro Nishigaki, Yuji Kondo
  • Patent number: 6751898
    Abstract: An integrated electroluminescent display device includes: at least one illumination assembly formed by a first set of layers, the illumination assembly including a first electrode, a second electrode, a layer of electroluminescent material disposed between the first and second electrodes, and a plurality of conductive leads connected to corresponding ones of the first and second electrodes, the first electrode being translucent; a printed circuit layer having a plurality of conductive segments connected to corresponding ones of the first and second electrodes via the conductive leads; and an electronic component layer including electronic components having electrical contacts connected to corresponding ones of the segments of the printed circuit layer, the electronic components providing for selective illumination of the illumination assembly, the printed circuit layer is disposed in a substantially parallel and contiguous relationship with the first set of layers.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: June 22, 2004
    Inventors: George W. Heropoulos, Tamas L. Torma
  • Publication number: 20040113868
    Abstract: The present invention discloses an integrated circuit (IC) driver chip for electroluminescent (EL) device, including an EL display-data-control block (DCB) and an EL display-segment-driver block (SDB), wherein said DCB stores the data for display and generates data-control-pulses for the EL segment display; and said SDB receives the data from the DCB and then drives the EL segments to display the desired information in real-time. This integrated circuit driver chip is suitable to be used to control and drive a multiple segment EL display. The applications of the IC include, but are not limited to, the display alphanumeric digits and image information. By cascading multiple IC driver chips together, it is possible to enlarge the number of display segments.
    Type: Application
    Filed: September 3, 2003
    Publication date: June 17, 2004
    Applicant: Chi Wai Wong
    Inventors: Chi Wai Wong, Chi Kwong Li
  • Patent number: 6707435
    Abstract: A process for monitoring the light intensity of an optical signaling or display device which has a plurality of light sources arranged on the front of a printed circuit board in a rasterized luminous field (F) and a diffusion lens arranged in the main light emission direction of the light sources or a light-collecting intermediate lens and a diffusion lens arranged in sequence, characterized by the process steps of using an at least partly transparent printed circuit board for arrangement of the light sources, arranging of sensors to detect light on the rear of this circuit board, detecting the light beams emitted rearwards towards the printed circuit board by the light sources and/or detection of the light beams reflected at the intermediate lens or, if this is omitted, at the diffusion lens and passing through the printed circuit board, conversing the detected light beams into signals which are passed to an electronic system, and initiating an action such as increasing the electrical power, advance warning
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: March 16, 2004
    Assignee: IMS Industrial Micro Systems AG
    Inventors: Sandro Merlato, Albert Frei
  • Patent number: 6703992
    Abstract: In an active matrix type EL device, a semiconductor layer (intersection protective film F1, F2, F3, F4) is inserted between lines at an intersection of a gate line GL and a data line DL; an intersection of the gate line GL and a power source line VL; an intersection of a storage capacitor line CL and the data line DL; and an intersection of the storage capacitor line CL and the power source line VL for inter-line insulation. No impurities are doped in the regions corresponding to these intersections CR1˜CR4, to thereby maintain high resistance. The intersection protective films are integrally formed for the intersections CR1 and CR2 and for the intersections CR3 and CR4 and extend over the respective two intersections. With the above-described structure, it is possible to prevent short circuit or deterioration of voltage withstanding characteristics at the intersections on the panel where lines intersect, without a drastic increase in the number of processes.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: March 9, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Tsutomu Yamada
  • Patent number: 6661397
    Abstract: An emissive display using an organic electroluminescent device is provided, in which the pixel circuit is simplified, the aperture ratio is increased, high resolution is achieved, and the power consumption is reduced. In the configuration, among the two sets of inverter circuits, one set of inverter circuit is formed by a circuit connecting an organic electoluminescent device and a transistor in series, and a transistor of a memory circuit is omitted. Also, in the mutual connection of the two sets of inverters, display data is inputted to a line connected to the gate of the transistor connected in series with the organic electoluminescent device, and owing to this connection, the write load is reduced, and the high resolution is achieved by enabling to write at high speed.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: December 9, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiro Mikami, Takayuki Ouchi, Yoshiyuki Kaneko, Toshihiro Sato
  • Patent number: 6633270
    Abstract: A display device includes (a) a plurality of pixels arranged in a matrix, each of the pixels including a light-emitting device, a switch and a transistor, (b) a scanning line extending in a first direction, (c) a data line extending in a second direction perpendicular to the first direction, (d) a first bias voltage line extending in the second direction, (e) a bias voltage generating circuit which applies a bias voltage to the bias voltage line, (f) a second bias voltage line which surrounds the pixels and is a closed line, and (g) a third bias voltage line which electrically connects the bias voltage generating circuit to the second bias voltage line. The first bias voltage line is electrically connected at opposite ends thereof to the second bias voltage line. The switch is turned on when the scanning line is activated, to thereby allow image signals to be transmitted to the gate of the transistor therethrough from the data line.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: October 14, 2003
    Assignee: NEC Electronics Corporation
    Inventor: Yoshiharu Hashimoto
  • Patent number: 6580409
    Abstract: A number of capacitive pixels formed in an electroluminescent display panel are selectively charged and discharged by the driving device. The driving device is composed of a charging circuit connected between a power source and the pixels and a discharging circuit connected between the pixels and the ground. Both the charging and discharging circuits include a respective inductive coil that constitutes a series L-C circuit together with the capacitive pixel. Since the pixels are charged and discharged through the series L-C circuit, impulse current otherwise flows in and out of the pixels is suppressed, and thereby radio noises generated by the impulse current are prevented.
    Type: Grant
    Filed: April 12, 2000
    Date of Patent: June 17, 2003
    Assignee: Denso Corporation
    Inventors: Takeshi Ito, Hideki Saito, Toshinori Ninoyu
  • Patent number: 6535185
    Abstract: An active driving circuit for a display panel includes first to fourth transistors, a capacitor, a constant current source, and a capacitor. The first transistor is connected with a positive power source. The second transistor has a common gate terminal together with the first transistor and a mirror circuit against the first transistor. Also, the second transistor is turned on by a common gate signal applied to the common gate terminal to supply the positive power source to a display device. The third transistor sets a saturated threshold voltage for the common gate terminal by allowing the first transistor and the second transistor to constitute a mirror circuit against each other in accordance with a scan line signal. The constant current source supplies a current with a ground one side and controlled by a gray signal of a data line. The fourth transistor sets the common gate voltage corresponding to the controlled current of the constant current source by the scan line signal.
    Type: Grant
    Filed: March 5, 2001
    Date of Patent: March 18, 2003
    Assignee: LG Electronics Inc.
    Inventors: Hak Su Kim, Oh Kyong Kwon, Young Sun Na
  • Publication number: 20030038756
    Abstract: A stacked camera system in which several cameras are stacked such that the nodal point of each camera lens is aligned with a predefined axis, and each camera is directed outward from the predefined axis to capture a designated region of the surrounding environment. In one embodiment, each camera of a four-camera system captures one-quarter of a surrounding environment, with each capture region originating from a vertical axis such that horizontal blind spots and parallax are minimized.
    Type: Application
    Filed: August 27, 2001
    Publication date: February 27, 2003
    Inventors: Leo R. Blume, John M. Wilson
  • Patent number: 6507326
    Abstract: To suppress light loss without deteriorating resolution of a projected image, light is first polarized and separated by a polarizing beam splitter. Green light is separated from a light flux emitted by the polarizing beam splitter by a dichroic mirror having a green light reflection property. A light flux containing blue and red light, which is transmitted by the dichroic mirror, is separated into red light and blue light by a dichroic prism. Resultant color light is modulated and reflected by reflection light valves, returned to the corresponding dichroic mirror or dichroic prism, and combined by the dichroic mirror and the dichroic prism. Resultant combined color light is projected via the polarizing beam splitter and a projection lens. The dichroic prism transmits s-polarized light having wavelengths less than a wavelength substantially within a wavelength band of green light and reflects s-polarized light having larger wavelengths.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: January 14, 2003
    Assignee: Nikon Corporation
    Inventors: Yuji Manabe, Tetsuo Hattori
  • Patent number: 6498592
    Abstract: A tiled display structure is fabricated on a single substrate that also serves as a circuit board containing electronic components. Electrodes are formed on the substrate and the remainder of the display section is formed on the electrodes. The pixel elements use patterned display material, and occupy only a portion of the pixel structure. The electronic components are mounted on the substrate using exceptionally long leads to assist in thermal management of tiles. Alternatively, each tile includes a fin structure on the circuit board surface onto which electronic components are mounted and are not in contact with the substrate. Alternatively, each tile includes a flexible circuit board mounted on the substrate, a portion of which is bent away from the substrate. Electronic components are coupled to this portion of the flexible circuit boards such that the components are not in contact with the substrate to assist in thermal management.
    Type: Grant
    Filed: November 10, 2000
    Date of Patent: December 24, 2002
    Assignee: Sarnoff Corp.
    Inventor: Dennis Lee Matthies
  • Patent number: 6496168
    Abstract: A transistor Q11 for supplying driving currents Ia to In to EL display elements 11a to 11n is provided in a stabilization voltage supply circuit 33. The transistor Q11 is connected to a current sensing resistor Ras for detecting a collector current of the transistor Q11. When a total current Ix for driving the EL display elements rises to a certain abnormal level, a bias suppressing element Qa is turned on to thereby reduce a base-emitter bias of the transistor 11.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: December 17, 2002
    Assignees: Autonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventor: Takayuki Tomida
  • Patent number: 6483491
    Abstract: A structure and driving method for a plasma display panel is disclosed in which discharge efficiency is improved and service-life of phosphors is increased. The structure for a plasma display panel includes a plurality of upper electrodes formed on an upper substrate at certain intervals in one direction, a dielectric layer formed on the upper substrate including the upper electrodes, an auxiliary electrode formed on the dielectric layer between adjacent upper electrodes, a passivation film formed on the dielectric layer including the auxiliary electrode, a lower electrode formed on a lower substrate opposite to the upper electrodes to be orthogonal to the upper electrodes, and a dielectric layer formed on the lower substrate including the lower electrode.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: November 19, 2002
    Assignee: LG Electronics Inc.
    Inventor: Eun Cheol Lee
  • Publication number: 20020000953
    Abstract: The object of the present invention is to provide an image display device capable of radiating over an image formed into a character with a uniform luminosity as a luminescent surface made according to the dot matrix system without increasing the number of components.
    Type: Application
    Filed: April 23, 2001
    Publication date: January 3, 2002
    Inventor: Masanori Yabuki
  • Publication number: 20010026251
    Abstract: A display device has current-addressed pixels, with the currents being supplied by driver circuitry which comprises a transistor (10) for applying a charging voltage to a switched capacitor arrangement (Ci, S1, S2) arranged to selectively charge and discharge the capacitor (Ci) at a predetermined rate to a charging voltage. A transistor control voltage (Vref) is applied to a control terminal of the transistor which is adjusted depending on the transistor threshold voltage to ensure that the capacitor (Ci) is charged to the charging voltage irrespectively of the value of the threshold voltage. This enables an accurately controllable current to be provided which is used to drive the current-addressed pixels.
    Type: Application
    Filed: March 28, 2001
    Publication date: October 4, 2001
    Applicant: U.S. Philips Corporation
    Inventors: Iain M. Hunter, Neil C. Bird
  • Patent number: 6202039
    Abstract: In a preferred embodiment, a system of physical measurement and display of a parameter, including: accepting an input signal representative of a value of the parameter, the input signal having an arbitrary shape and amplitude; and displaying the value of the parameter in an arbitrary shape; including the use of analog and digital circuitry and nonvolatile memory.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: March 13, 2001
    Assignee: Curtis Instruments, Inc.
    Inventor: Eugene P. Finger
  • Patent number: 6072450
    Abstract: Selection transistors and drive transistors are formed in individual pixel areas on a substrate. Cathode electrodes which reflect visible light are formed above the selection transistors and the drive transistors so as to cover the pixel areas, with flat insulation films between the cathode electrodes and the selection and drive transistors. An organic EL layer and an anode electrode are sequentially formed on the cathode electrodes.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: June 6, 2000
    Assignee: Casio Computer Co., Ltd.
    Inventors: Hiroyasu Yamada, Tomoyuki Shirasaki, Yoshihiro Kawamura
  • Patent number: 6040069
    Abstract: The invention relates to an electroluminescence device having at least one light-emitting layer which comprises conjugated, stiff-chain polymers which are soluble in organic solvents, wherein the emitted electroluminescence is polarized and the intensity of the light which is polarized parallel to the longitudinal axis of the substrate is at least three times the intensity polarized perpendicular thereto.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: March 21, 2000
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Donald Lupo, Marcus Remmers, Dieter Neher