Patents by Inventor Yasuo Yagi

Yasuo Yagi 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: 7450776
    Abstract: A gradation attributes correcting device to correct gradation attributes of an input image signal includes a brightness gradation correcting unit to correct gradation attributes with respect to brightness of an image indicated by the input image signal. The brightness gradation correcting unit includes a characteristic information acquisition unit, a correction information decision unit, and a brightness gradation processing unit. The characteristic information acquisition unit acquires a minimum, average, and maximum brightness, of an image on a frame from the input image signal. The correction information decision unit determines correction information to correct the gradation attributes with respect to brightness according to combinations of the acquired minimum, average and maximum brightness of the image on the frame.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: November 11, 2008
    Assignee: Seiko Epson Corporation
    Inventors: Fumio Koyama, Yasuo Yagi
  • Publication number: 20070222728
    Abstract: In a video signal processing device, a black-white expansion circuit performs black-white expansion of a luminance signal (Y signal) included in a video signal to generate an expanded luminance signal (Y? signal). A luminance ratio ā€˜nā€™ is computed as the rate of the expanded luminance signal (Y? signal) to the luminance signal (Y signal). A first color difference signal (U signal) and a second color difference signal (V signal) included in the video signal are respectively multiplied by the luminance ratio ā€˜nā€™ (=Y?/Y) to give an expanded first color difference signal (U? signal) and an expanded second color difference signal (V? signal). This arrangement of the invention effectively enables black-white expansion with no color change, while attaining reduction of the overall circuit scale.
    Type: Application
    Filed: March 13, 2007
    Publication date: September 27, 2007
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Fumio Koyama, Yasuo Yagi
  • Publication number: 20060007511
    Abstract: A gradation attributes correcting device to correct gradation attributes of an input image signal includes a brightness gradation correcting unit to correct gradation attributes with respect to brightness of an image indicated by the input image signal. The brightness gradation correcting unit includes a characteristic information acquisition unit, a correction information decision unit, and a brightness gradation processing unit. The characteristic information acquisition unit acquires a minimum, average, and maximum brightness, of an image on a frame from the input image signal. The correction information decision unit determines correction information to correct the gradation attributes with respect to brightness according to combinations of the acquired minimum, average and maximum brightness of the image on the frame.
    Type: Application
    Filed: July 1, 2005
    Publication date: January 12, 2006
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Fumio Koyama, Yasuo Yagi
  • Patent number: 6266110
    Abstract: An uppermost metal wiring layer is formed of titan Ti and titan nitride TiN formed thereon, on which tungsten W for filling a via hole can be deposited. The via hole is filled with W. The surface of a metal wiring layer below the uppermost metal wiring layer is covered with a low reflectivity film made of titan nitride. Thus, light incident on the surface of the semiconductor chip is prevented from reaching a substrate transistor within a semiconductor device and malfunctioning of the semiconductor device is prevented.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: July 24, 2001
    Assignees: Kawasaki Steel Corporation, Pioneer Electronic Corporation, Pioneer Video Corporation
    Inventors: Makoto Mizuno, Masanori Iwahashi, Toshihiro Shimizu, Masaaki Fujishima, Koji Hanihara, Itaru Tsuchiya, Yasuo Yagi
  • Patent number: 5892563
    Abstract: A reflective type liquid crystal display device includes: a semiconductor substrate; a transparent substrate having a transparent electrodes; a liquid crystal layer interposed between these substrates; switching elements being formed on the semiconductor substrate correspondingly to a pixel-array; and pixel-electrodes disposed in matrix over the switching elements correspondingly to the pixel-array. Each of the pixel-electrodes is made of a metal selected from a group of materials each generating an electric potential which is substantially the same as an electric potential occurring on each of the transparent electrodes. The reflective type liquid crystal display device is capable of preventing the generation of flicker caused by the battery-effect.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: April 6, 1999
    Assignee: Pioneer Electronic Corporation
    Inventors: Akihiro Ono, Yasuo Yagi
  • Patent number: 5888900
    Abstract: A method for manufacturing semiconductor device is provided, this method comprises the steps of: depositing a metal film for forming wirings on a substrate; forming a wiring layer, wherein dummy wiring is inserted between wiring space where the dummy wiring can be inserted, and wiring space, where the dummy wiring cannot be inserted, is reduced by widening wiring pattern facing the wiring space; forming an interlayer insulating film on said wiring layer; and flattening surface of the interlayer insulating film. The film can be flattened by a CMP method or by an etchback of entire surface of the film. It is possible to flatten the surface of the semiconductor device cost-effectively and precisely.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: March 30, 1999
    Assignees: Kawasaki Steel Corporation, Pioneer Electronic Corporation, Pioneer Video Corporation
    Inventors: Makoto Mizuno, Toshihiro Shimizu, Masaaki Fujishima, Koji Hanihara, Itaru Tsuchiya, Yasuo Yagi
  • Patent number: 5612750
    Abstract: A line contour enhancing circuit comprises a second order differentiation circuit for effecting a second order differentiation to a video signal and producing a second order differentiation signal, an adding circuit for adding the video signal and the second order differentiation signal, and a non-linear amplifier having a gain characteristic in which a differentiation gain increases gradually as the level of its input signal increases. The circuit features that the second order differentiation circuit receives the video signal output from the non-linear amplifier, thereby the line contour enhancing operation is effected depending on the level of the video signal. With this arrangement the degradation of the image produced by a low luminance level video signal due to the presence of noises is prevented.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: March 18, 1997
    Assignee: Pioneer Electronic Corporation
    Inventor: Yasuo Yagi
  • Patent number: 5231396
    Abstract: A digital-to-analog converter has a plurality of switches, each of which being responsive to a bit of a digital signal having n bits, to selectively pass therethrough a weighted current having a magnitude of 2.sup.i-1 Ic where i is an ith bit. The respective weighted current flows through a corresponding transistor into a resistor ladder circuit. The resistor ladder circuit has a plurality of arms, each of which receive a weighted current from the emitter of a corresponding transistor. The digital-to-analog converter further includes a plurality of base resistors connected in series such that the bases of the transistors are connected with corresponding junctions of the base resistors r1-r7. The plurality of base resistors carry a first current therethrough.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: July 27, 1993
    Assignee: Pioneer Electric Corporation
    Inventor: Yasuo Yagi
  • Patent number: 4811101
    Abstract: A black level correction circuit includes an extraction circuit for extracting a black signal from a video signal as a signal whose level is lower than a reference level, and a black level expanding circuit for expanding in level of the black signal for that peak level of the black signal equals a normal black level. The circuit further includes a level adjusting circuit which adjusts the reference level for extracting the black signal on the basis of at least one of an average value of a luminance signal portion the video signal, and a beam current value of a cathode-ray tube to which the video signal is supplied. With the variable reference level, contrast is improved for pictures having high luminance levels or low luminance levels on the whole.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: March 7, 1989
    Assignee: Pioneer Electronic Corporation
    Inventor: Yasuo Yagi
  • Patent number: 4780623
    Abstract: A contour compensating circuit is disclosed for compensating a video signal in such a manner as to obtain contour portions which are not overly stressed.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: October 25, 1988
    Assignee: Pioneer Electronic Corporation
    Inventor: Yasuo Yagi
  • Patent number: 4760450
    Abstract: A limiter circuit for video display terminal which produces contrast voltage comprises an amplifier for amplifying video signals received from a source thereof, and a series of transistors receiving the video signal from the amplifier, arranged for selectively limiting the occurrence of blooming on the display terminal in response to the value of the contrast voltage of the terminal.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: July 26, 1988
    Assignee: Pioneer Electronic Corporation
    Inventor: Yasuo Yagi
  • Patent number: 4541014
    Abstract: A contour correcting circuit emphasizes the contour of a video signal by increasing the rise and fall characteristics of the signal by using a high frequency extraction circuit in combination with a delay circuit and an adder adding in the delay output to the extracted signal. An amplitude limiter limits the adder output to between upper and lower limits of the input video signal and a second delayed signal.
    Type: Grant
    Filed: June 15, 1983
    Date of Patent: September 10, 1985
    Assignee: Pioneer Electronic Corporation
    Inventor: Yasuo Yagi