Patents by Inventor Yutaka Nanno

Yutaka Nanno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7256757
    Abstract: An organic EL display panel includes a substrate, pixel electrodes, a common electrode, signal lines, power supply lines, thin-film transistors, scan lines, organic EL elements and storage capacitors. To obtain a full color image by light emissions of the organic EL elements, red, green and blue emitters are patterned correspondently with the pixel electrodes and arranged in this order along the gate line direction. The emitters are patterned such that each pair of the red, green and blue emitters which are adjacent to each other along the gate line direction overlap each other to define a light-emitting layer overlap region, where colors of light components which exit the organic EL elements and pass through the emitters are mixed, between the adjacent organic EL elements arranged along the gate line direction. At least one of the thin-film transistor and the storage capacitor is arranged in the light-emitting layer overlap region.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: August 14, 2007
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Yutaka Nanno, Hiroshi Tsutsu
  • Patent number: 7173612
    Abstract: An EL display device 1 includes a display portion 2 having unit pixels 10 arranged in a matrix, a source line driver circuit 6, and a gate line driver circuit 4. Each of the unit pixels 10 has an EL element 11, a switching transistor Tr1, a driver transistor Tr2, and an auxiliary capacitor 13. The auxiliary capacitor 13 has electrodes, one connected to a gate electrode of the transistor Tr2 and the other to a next gate line GL. The gate line driver circuit 4 outputs, via the next gate line GL, blanking signals for forcibly stopping a light-emitting state of the EL elements 11, within hold times in which the voltages written to the gate electrodes of the transistors Tr2 are held. With such a configuration, a blanking period where the EL elements do not emit light, is inserted in one frame.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: February 6, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yutaka Nanno, Kouji Senda
  • Patent number: 7084848
    Abstract: An active matrix liquid crystal display device has a plurality of unit pixels being arranged in a matrix configuration, each unit pixel being divided into a plurality of subpixels. Each of the subpixels has a subpixel electrode, a pixel transistor connected to the subpixel electrode, and a voltage controlling capacitor connected to the subpixel electrode. A voltage controlling capacitor line for supplying a compensation voltage signal is connected to the voltage controlling capacitor so that after the writing to the subpixel has been completed, the potential of the compensation voltage signal is varied to modulate the potential of the subpixel electrode to be a predetermined voltage, using the voltage controlling capacitor. Such combining of spatial dithering attained by a pixel-dividing technique and a capacitively-coupled driving method eliminates the need for digital-to-analog converter circuits, attains gray scale display based on a digital image signal, and achieves a reduction in power consumption.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: August 1, 2006
    Assignee: Matsushita Electric Industrial Co., LTD
    Inventors: Kouji Senda, Yutaka Nanno, Shin-itsu Takehashi
  • Patent number: 7061453
    Abstract: A unit pixel (10) includes a plurality of current controlling elements (Tr2a–Tr2d) having controlling terminal and connected to a single EL element (11), and switching elements (Tr1a–Tr1d) provided to the respective current controlling elements in order to switch between application and cutoff of a digital image signal with respect to the controlling terminals in accordance with the condition of a scanning signal. Each of the current controlling elements is controlled by a voltage of the digital image signal so as to take an OFF state for cutting off a supply of a driving current to the EL element or an ON state for supplying the EL element with a driving current corresponding to the voltage of the digital image signal, and a value of the current flowing in the EL element is the sum value of currents supplied from the respective current controlling elements in the ON state.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: June 13, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kouji Senda, Yutaka Nanno, Hiroshi Tsutsu
  • Publication number: 20050275779
    Abstract: A liquid crystal display includes a liquid crystal cell which includes a back substrate, a front substrate facing the back substrate, and a liquid crystal layer sandwiched between the back substrate and the front substrate, wherein the front substrate is to be located between a viewer and the back substrate, a front polarizer which faces the front substrate, and an outer retardation member which faces the front substrate with the front polarizer interposed therebetween and converts linearly polarized light from the front polarizer into circularly or elliptically polarized light.
    Type: Application
    Filed: June 8, 2005
    Publication date: December 15, 2005
    Inventor: Yutaka Nanno
  • Publication number: 20050212449
    Abstract: An organic EL display panel includes a substrate, pixel electrodes, a common electrode, signal lines, power supply lines, thin-film transistors, scan lines, organic EL elements and storage capacitors. To obtain a full color image by light emissions of the organic EL elements, red, green and blue emitters are patterned correspondently with the pixel electrodes and arranged in this order along the gate line direction. The emitters are patterned such that each pair of the red, green and blue emitters which are adjacent to each other along the gate line direction overlap each other to define a light-emitting layer overlap region, where colors of light components which exit the organic EL elements and pass through the emitters are mixed, between the adjacent organic EL elements arranged along the gate line direction. At least one of the thin-film transistor and the storage capacitor is arranged in the light-emitting layer overlap region.
    Type: Application
    Filed: May 25, 2005
    Publication date: September 29, 2005
    Inventors: Yutaka Nanno, Hiroshi Tsutsu
  • Patent number: 6909413
    Abstract: The present invention provides a liquid crystal display device having a liquid crystal display portion, a gate driver circuit, a source driver circuit, and a power supply circuit, where the liquid crystal display portion includes unit pixels with pixel switching elements and pixel electrodes arranged in a matrix. The pixel switching elements are thin film transistors that are made of polycrystalline silicon semiconductor formed on an insulating substrate. The power supply circuit is a charge pump-type power supply circuit, is made of a polycrystalline silicon semiconductor, and is a built-in circuit integrally formed on an insulating substrate. With such a configuration, a liquid crystal display device that greatly reduces power consumption is realized.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: June 21, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yutaka Nanno, Kouji Senda, Shin-itsu Takehashi
  • Publication number: 20040196218
    Abstract: A unit pixel (10) includes a plurality of current controlling elements (Tr2a-Tr2d) having controlling terminal and connected to a single EL element (11), and switching elements (Tr1a-Tr1d) provided to the respective current controlling elements in order to switch between application and cutoff of a digital image signal with respect to the controlling terminals in accordance with the condition of a scanning signal. Each of the current controlling elements is controlled by a voltage of the digital image signal so as to take an OFF state for cutting off a supply of a driving current to the EL element or an ON state for supplying the EL element with a driving current corresponding to the voltage of the digital image signal, and a value of the current flowing in the EL element is the sum value of currents supplied from the respective current controlling elements in the ON state.
    Type: Application
    Filed: December 23, 2003
    Publication date: October 7, 2004
    Inventors: Kouji Senda, Yutaka Nanno, Hiroshi Tsutsu
  • Publication number: 20040113872
    Abstract: An EL display device 1 includes a display portion 2 having unit pixels 10 arranged in a matrix, a source line driver circuit 6, and a gate line driver circuit 4. Each of the unit pixels 10 has an EL element 11, a switching transistor Tr1, a driver transistor Tr2, and an auxiliary capacitor 13. The auxiliary capacitor 13 has electrodes, one connected to a gate electrode of the transistor Tr2 and the other to a next gate line GL. The gate line driver circuit 4 outputs, via the next gate line GL, blanking signals for forcibly stopping a light-emitting state of the EL elements 11, within hold times in which the voltages written to the gate electrodes of the transistors Tr2 are held. With such a configuration, a blanking period where the EL elements do not emit light, is inserted in one frame.
    Type: Application
    Filed: July 30, 2003
    Publication date: June 17, 2004
    Inventors: Yutaka Nanno, Kouji Senda
  • Publication number: 20020196208
    Abstract: The present invention provides a liquid crystal display device having a liquid crystal display portion, a gate driver circuit, a source driver circuit, and a power supply circuit, where the liquid crystal display portion includes unit pixels with pixel switching elements and pixel electrodes arranged in a matrix. The pixel switching elements are thin film transistors that are made of polycrystalline silicon semiconductor formed on an insulating substrate. The power supply circuit is a charge pump-type power supply circuit, is made of a polycrystalline silicon semiconductor, and is a built-in circuit integrally formed on an insulating substrate. With such a configuration, a liquid crystal display device that greatly reduces power consumption is realized.
    Type: Application
    Filed: June 20, 2002
    Publication date: December 26, 2002
    Inventors: Yutaka Nanno, Kouji Senda, Shin-itsu Takehashi
  • Patent number: 6411273
    Abstract: An object of the present invention is, by eliminating a driver IC from the components of an liquid crystal display, to achieve a cost reduction, to eliminate a manufacturing step of mounting the driver IC onto an array substrate, and to reduce a thickness of the liquid crystal display. A driver circuit for an active matrix liquid crystal display comprises a resistive dividing type digital-to-analog converter circuit (DAC). An analog output voltage from the DAC is amplified by a signal amplifier element, and a liquid crystal element is driven by the amplified analog output voltage. The driver circuit is characterized in that a resistance element R is formed in an n+ layer of p-Si on an array substrate of the liquid crystal display, and a switching element Tr and a signal amplifier element are also formed on the array substrate.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: June 25, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mika Nakamura, Yutaka Nanno, Naomi Kaneko, Masumi Izuchi, Hiroshi Tsutsu, Katsumi Adachi
  • Publication number: 20020047822
    Abstract: An active matrix liquid crystal display device has a plurality of unit pixels being arranged in a matrix configuration, each unit pixel being divided into a plurality of subpixels. Each of the subpixels has a subpixel electrode, a pixel transistor connected to the subpixel electrode, and a voltage controlling capacitor connected to the subpixel electrode. A voltage controlling capacitor line for supplying a compensation voltage signal is connected to the voltage controlling capacitor so that after the writing to the subpixel has been completed, the potential of the compensation voltage signal is varied to modulate the potential of the subpixel electrode to be a predetermined voltage, using the voltage controlling capacitor. Such combining of spatial dithering attained by a pixel-dividing technique and a capacitively-coupled driving method eliminates the need for digital-to-analog converter circuits, attains gray scale display based on a digital image signal, and achieves a reduction in power consumption.
    Type: Application
    Filed: October 31, 2001
    Publication date: April 25, 2002
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Kouji Senda, Yutaka Nanno, Shin-itsu Takehashi
  • Patent number: 6038004
    Abstract: An active matrix liquid crystal display for projection system comprises a light shielding layer 12 arranged between a layer 13 including thin film transistors and a first substrate 11 for shielding an injection light toward each of the thin transistors, said light shielding layer 12 having a plurality of openings through which each of the pixel electrodes 22 is exposed against the injection light. The light shielding layer 12 is preferably made of metal and is connected to an electric source. A level of voltage applied on the data lines is adverse to that applied on the light shielding layer with respect to polarity of the applied voltage.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: March 14, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yutaka Nanno, Masumi Izuchi, Tetsuya Kawamura, Mika Nakamura, Kazuo Inoue
  • Patent number: 5986631
    Abstract: A driving method of an active matrix LCD is provided. According to this method, a scan signal has three voltage levels, i.e., an ON voltage Vg, an OFF voltage Voff and a compensation voltage Ve having the opposite polarity with respect to the OFF voltage Voff. In contrast with the conventional capacitively coupled driving method in which the scan signal consists of four voltages, the driving method of this invention can reduce a cost and power consumption for a driver IC without degradation due to flickers or other causes. The method for adjusting the brightness of the LCD accompanying this driving method as well as the method for optimizing design parameters of the compensation voltage Ve and a thin film transistor of the LCD are also described.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: November 16, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yutaka Nanno, Yoneharu Takubo
  • Patent number: 5706023
    Abstract: A method of driving a display device having a matrix of display material elements includes transmitting a picture signal voltage to each picture element electrode during an ON period of a respective switching element, applying a first modulation signal to a first wire during an OFF period of the switching elements associated with the first wire, and applying a second modulation signal to counter electrodes associated with the first wire during the OFF period of the switching elements associated with the first wire. Each picture element electrode of a plurality of the display material elements is connected to the first wire through a respective capacitance.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 6, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Seiichi Nagata, Etsuya Takeda, Tetsuya Kawamura, Yutaka Nanno
  • Patent number: 5296847
    Abstract: A method of driving a display unit having matrix-arranged pixel electrodes each connected via a capacitor to a first line, each pixel electrode being connected to a switching element which is electrically connected to an image signal line and scan signal line, and display material held between the pixel electrode and opposing electrode and being AC driven, wherein an image signal voltage is transmitted to the pixel electrode during an on-period of the switching element, and a modulating signal with its voltage reversing alternately for each field is applied to the first line during an off-period of the switching element, thereby changing the potential of the pixel electrode so that the changed potential is superposed upon, or cancelled out from, the image signal voltage, the resultant voltage being applied across the display material.
    Type: Grant
    Filed: June 22, 1992
    Date of Patent: March 22, 1994
    Assignee: Matsushita Electric Industrial Co. Ltd.
    Inventors: Etsuya Takeda, Yutaka Nanno, Seiichi Nagata
  • Patent number: 5200876
    Abstract: An electrostatic breakdown protection circuit protects an internal circuit from positive and negative high voltages. One form of the protection circuit includes a hot line connected to the internal circuit for supplying a data signal, a bypass line, a first diode connected in a first direction between the hot line and the bypass line, and a second diode connected in a second direction between the hot line and the bypass line in parallel to the first diode.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: April 6, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Etsuya Takeda, Yutaka Nanno
  • Patent number: 5151805
    Abstract: A driving method of a display apparatus for AC driving display materials such as liquid display and so on to the picture display by the use of an active matrix with switching elements of thin film transistors so that the output signal voltage of the signal driving circuit of the active matrix display apparatus is considerably reduced and the consumption power of the same driving circuit handling the analog signal may be reduced.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: September 29, 1992
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Etsuya Takeda, Yutaka Nanno, Seiichi Nagata
  • Patent number: 4938566
    Abstract: In an electro-optical effect display apparatus, a number of pairs of two parallel and closely disposed scanning bus-lines (21-21, 21-21, . . . ) are disposed on a substrate with a predetermined interval therebetween, and a first electrode bus-line (25) is disposed between each other neighboring two pairs of the scanning bus-lines (21-21 and 21-21). Then respective storage capacitors (26) belonging to two display elements (24, 24), each other neighboring with respect to the first electrode bus-line (25), are connected commonly to the first electrode bus-line (25), thereby utilizing a single first electrode bus-line (25) commonly for two storage capacitors (26, 26) which are disposed substantially symmetrically to the first electrode bus-line (25); and thus, the number of bus-lines can be reduced, and consequently, the area of the display element increases.
    Type: Grant
    Filed: September 13, 1988
    Date of Patent: July 3, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Etsuya Takeda, Yutaka Nanno, Takao Kawaguchi, Seiichi Nagata
  • Patent number: 4778560
    Abstract: A method of production of active matrix display substrates using thin film transistors and more particularly to a method for production of substrates for liquid-crystal display use. The active matrix substrate using the thin film transistor is produced by the mask processes of smaller number. The process of the present invention can reduce the number of the masks, by one, of the active matrix substrate using the inverted staggered thin film transistor which requires the masks from five levels to six levels. Further improvements reduce the number of the masks to four levels from three levels, thus contributing greatly towards lower cost, improved yield.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: October 18, 1988
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Etsuya Takeda, Takao Kawaguchi, Yutaka Nanno, Noriko Okawa, Seiichi Nagata