Patents by Inventor Yoshinori Asamura

Yoshinori Asamura 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).

  • Publication number: 20180240398
    Abstract: A light-emitting diode display device includes: a display that includes a light-emitting diode; a drive unit that drives the light-emitting diode; a lighting time storage unit; a first temperature detection unit; a first temperature storage unit; an aging display that includes a measurement light-emitting diode; a drive unit that drives the measurement light-emitting diode; a drive data generation unit; a second temperature detection unit; a second temperature storage unit; a brightness measurement unit that measures brightness of the measurement light-emitting diode; a brightness reduction rate storage unit; a compensation factor calculation unit that finds a compensation factor from the cumulative lighting time and the brightness reduction rate, and corrects the compensation factor on the basis of a difference between the first temperature and the second temperature; and a brightness compensation circuit that compensates the brightness of the light-emitting diode on the basis of the compensation factor.
    Type: Application
    Filed: September 1, 2016
    Publication date: August 23, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naoyuki MACHIDA, Shigenori SHIBUE, Yoshinori ASAMURA
  • Publication number: 20180174504
    Abstract: An object is to provide a technique capable of suppressing a power consumption of an LED. An LED display device includes voltage supply parts, which can supply a multiple types of voltages being different from each other and a driver which drives an LED display using the multiple types of voltages. The driver switches a combination of an LED array in a lighting target group which is one of the plurality of groups being subject to lighting-up and the multiple types of voltages which should be supplied in parallel with the LED array, under a time sharing control, and turns on some LEDs, which should be turned on by the voltages which should be supplied to the LED array, in the plurality of LEDs included in the LED array in the lighting target group.
    Type: Application
    Filed: July 1, 2016
    Publication date: June 21, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Isao YONEOKA, Shigenori SHIBUE, Yoshinori ASAMURA
  • Publication number: 20180158400
    Abstract: An LED display device includes a first display unit including a plurality of LED elements, a second display unit including a measurement LED element equivalent to the LED element included in the first display unit, a luminance measurement unit to measure a luminance of the measurement LED element, a luminance decrease rate storage unit to store therein a luminance decrease rate of the measurement LED element, an accumulated lighting time estimation unit to estimate an accumulated lighting time at intervals of a predetermined time, an average duty ratio storage unit to store therein an average duty ratio obtained by dividing the accumulated lighting time which is estimated, by an accumulated operating time, and a luminance correction coefficient calculation unit to obtain a luminance decrease rate with reference to the luminance decrease rate storage unit and the average duty ratio storage unit and calculate a luminance correction coefficient from the luminance decrease rate.
    Type: Application
    Filed: August 5, 2016
    Publication date: June 7, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takashi MATOBA, Shigenori SHIBUE, Yoshinori ASAMURA
  • Patent number: 9743476
    Abstract: A light source control device includes a constant-current circuit that collectively supplies a current to a plurality of LEDs, a current detection circuit that divides the plurality of LEDs into groups and detects a current amount of a current supplied to each of the groups, and a microcomputer that detects an open fault in the LEDs on the basis of a ratio of the current amount in each of the groups and controls a current supplied from the constant-current circuit to be reduced in a case where an open fault is detected in the LEDs.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: August 22, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Yoneoka, Yoshinori Asamura, Zenkou Yamamoto, Haruhisa Inoue
  • Patent number: 9591720
    Abstract: An LED display apparatus includes a first LED display including a first LED, a second LED display including a second LED, and a luminance corrector. The luminance corrector corrects a luminance of the first LED in accordance with a first cumulative lighting period of the first LED and with both luminance transitions and a second cumulative lighting period of the second LED.
    Type: Grant
    Filed: July 7, 2016
    Date of Patent: March 7, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshinori Asamura, Shigenori Shibue, Isao Yoneoka, Yasunori Wada
  • Publication number: 20170042002
    Abstract: An LED display apparatus includes a first LED display including a first LED, a second LED display including a second LED, and a luminance corrector. The luminance corrector corrects a luminance of the first LED in accordance with a first cumulative lighting period of the first LED and with both luminance transitions and a second cumulative lighting period of the second LED.
    Type: Application
    Filed: July 7, 2016
    Publication date: February 9, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshinori ASAMURA, Shigenori SHIBUE, Isao YONEOKA, Yasunori WADA
  • Publication number: 20160343349
    Abstract: An LED display apparatus includes an LED aging unit, a correction factor computing unit, and a luminance correction circuit. The LED aging unit includes an LED aging display that includes at least one second LED, a luminance measurer that measures luminance decrease rates of the second LED per color correspondently to lighting periods of first LEDs, and a luminance decrease rate storage that stores the luminance decrease rates. The correction factor computing unit computes correction factors for correcting luminances of the first LEDs per color in accordance with cumulative lighting periods of the first LEDs of corresponding colors and the luminance decrease rates of corresponding colors. The luminance correction circuit corrects the luminance of the first LEDs per color in accordance with the correction factors.
    Type: Application
    Filed: May 2, 2016
    Publication date: November 24, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naoyuki MACHIDA, Shigenori SHIBUE, Yoshinori ASAMURA
  • Patent number: 9445484
    Abstract: In the case where luminance of light to be irradiated onto a multi-screen is not homogenized over the entire multi-screen, each of an image display apparatus and image display apparatuses carries out a homogenizing process of light to be irradiated onto a multi-screen over the entire multi-screen.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: September 13, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Isao Yoneoka, Yoshinori Asamura, Takashi Matoba
  • Patent number: 9392239
    Abstract: In a multi-screen display apparatus according to the present invention, a master image display apparatus acquires determination results obtained by an input detector and acquires a video signal of which channel is selected by a selector from each of a plurality of image display apparatuses including the master image display apparatus. In a case where the selector of any of the image display apparatuses selects a video signal of a channel that is not input to the video receiver, the master image display apparatus controls the selector of the image display apparatus to select a video signal of another channel that is input to the video receiver and controls the selector of at least one of the others of the image display apparatuses to select a video signal of the other channel.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: July 12, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshinori Asamura, Isao Yoneoka, Noboru Hamaguchi
  • Patent number: 9370082
    Abstract: A controller determines whether parallel-connected light sources include a faulty light source. When a faulty light source is included, the controller controls at least one of a current supply unit and a switching unit such that a current is continuously supplied to normal light sources being light sources of the light sources except for the faulty light source.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: June 14, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Isao Yoneoka, Yoshinori Asamura, Zenkou Yamamoto, Haruhisa Inoue
  • Publication number: 20160095194
    Abstract: A controller determines whether parallel-connected light sources include a faulty light source. When a faulty light source is included, the controller controls at least one of a current supply unit and a switching unit such that a current is continuously supplied to normal light sources being light sources of the light sources except for the faulty light source.
    Type: Application
    Filed: August 24, 2015
    Publication date: March 31, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Isao YONEOKA, Yoshinori ASAMURA, Zenkou YAMAMOTO, Haruhisa INOUE
  • Publication number: 20160062725
    Abstract: A calculating unit of a master apparatus that comes first in a transmission sequence calculates coordinates of a plurality of video display apparatuses on a multiscreen on the basis of arrangement information and the transmission sequence. The calculating unit an identification number on the basis of an identification setting rule. A setting unit performs a processing for setting the identification number of each of the video display apparatuses with the calculated coordinates to the video display apparatus concerned.
    Type: Application
    Filed: August 11, 2015
    Publication date: March 3, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kensuke ODAGIRI, Yoshinori ASAMURA, Yasunori WADA
  • Publication number: 20150381954
    Abstract: In a multi-screen display apparatus according to the present invention, a master image display apparatus acquires determination results obtained by an input detector and acquires a video signal of which channel is selected by a selector from each of a plurality of image display apparatuses including the master image display apparatus. In a case where the selector of any of the image display apparatuses selects a video signal of a channel that is not input to the video receiver, the master image display apparatus controls the selector of the image display apparatus to select a video signal of another channel that is input to the video receiver and controls the selector of at least one of the others of the image display apparatuses to select a video signal of the other channel.
    Type: Application
    Filed: June 1, 2015
    Publication date: December 31, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshinori ASAMURA, Isao YONEOKA, Noboru HAMAGUCHI
  • Publication number: 20150373803
    Abstract: A light source control device includes a constant-current circuit that collectively supplies a current to a plurality of LEDs, a current detection circuit that divides the plurality of LEDs into groups and detects a current amount of a current supplied to each of the groups, and a microcomputer that detects an open fault in the LEDs on the basis of a ratio of the current amount in each of the groups and controls a current supplied from the constant-current circuit to be reduced in a case where an open fault is detected in the LEDs.
    Type: Application
    Filed: May 26, 2015
    Publication date: December 24, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Isao YONEOKA, Yoshinori ASAMURA, Zenkou YAMAMOTO, Haruhisa INOUE
  • Patent number: 9207526
    Abstract: A projection type video display includes a light source including light source parts, which are the LED arrays each including six LEDs, for every predetermined colors; a light source controller time-division driving each of the light source parts at a timing based on an input video signal to be input from the outside; and a video display device modulating light emitted from each of the light source parts based on the input video signal and projecting the modulated light onto a screen, wherein the light source controller controls only three LEDs among the six LEDs to turn on in each driving of the time-division driving of each of the light source parts.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: December 8, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takashi Matoba, Yoshinori Asamura, Isao Yoneoka
  • Patent number: 9148615
    Abstract: A video display device drives LEDs to emit light by light source driving circuits, detects maximum signal levels for the respective colors from video signals for an amount of n screens (n is an integer equal to or larger than one), and calculates amplification factors for the respective colors based on the detected maximum signal levels. In addition, the video display device amplifies the signal levels of the video signals based on the amplification factors for the respective colors calculated in a power saving mode for reducing power consumption, and controls drive current values of the LEDs to be respectively supplied to the light source driving circuits so as to cancel amplification amounts of brightnesses of the LEDs that correspond to amplification amounts of the signal levels of the video signals amplified.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: September 29, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kiyoshi Sawada, Yoshinori Asamura, Isao Yoneoka
  • Patent number: 9131585
    Abstract: A microcomputer of a light source control device specifies an LED belonging to LEDs and subjected to a short-circuit failure based on a result of determination by a short-circuit failure detecting circuit and current amounts sensed by current sensing circuits respectively. The microcomputer makes corresponding one of switching elements interrupt supply of a current to the specified LED. The microcomputer makes a constant current circuit supply an LED not specified with a current not exceeding a current responsive to the number of such LEDs not specified.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: September 8, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Yoneoka, Yoshinori Asamura, Zenkou Yamamoto, Haruhisa Inoue
  • Publication number: 20150138252
    Abstract: A microcomputer calculates a target brightness per brightness mode. Each projection video image display device specifies a target control current value corresponding to a calculated target brightness corresponding to a brightness mode set to the projection video image display device. Each projection video image display device supplies a current indicating the specified control current value to a light source of the projection video image display device.
    Type: Application
    Filed: September 19, 2014
    Publication date: May 21, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshiyuki OKANO, Yoshinori ASAMURA
  • Publication number: 20150102726
    Abstract: A microcomputer of a light source control device specifies an LED belonging to LEDs and subjected to a short-circuit failure based on a result of determination by a short-circuit failure detecting circuit and current amounts sensed by current sensing circuits respectively. The microcomputer makes corresponding one of switching elements interrupt supply of a current to the specified LED. The microcomputer makes a constant current circuit supply an LED not specified with a current not exceeding a current responsive to the number of such LEDs not specified.
    Type: Application
    Filed: September 18, 2014
    Publication date: April 16, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: lsao YONEOKA, Yoshinori ASAMURA, Zenkou YAMAMOTO, Haruhisa INOUE
  • Patent number: 8878993
    Abstract: An image data processing apparatus of the present invention includes: a base clock output circuit for outputting a base clock; a plurality of image processors; and a plurality of external PLL circuits provided for each one of the plurality of image processors. The plurality of external PLL circuits each synchronize an output clock given from a corresponding one of the plurality of image processors with the base clock.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: November 4, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Yoshinori Asamura