Patents by Inventor Fumiyuki Kobayashi

Fumiyuki Kobayashi 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: 20200013331
    Abstract: The disclosure has an object to suppress reduction in display quality due to insufficient charge in a display device adopting a Source Shared Driving (SSD) method. A display device includes a demultiplexer portion including switches. Three switches are provided for each of output portions of a source driver to enable a data signal to be distributed to three data lines. In display of a moving picture, a driving frequency is set to a frequency higher than a driving frequency in display of a still picture, and the three switches are simultaneously turned to an ON state in each of horizontal scan periods. In display of a still picture, the driving frequency is set to a frequency lower than the driving frequency in display of a moving picture is performed, and the three switches are sequentially turned to an ON state at predetermined intervals in each of the horizontal scan periods.
    Type: Application
    Filed: September 14, 2017
    Publication date: January 9, 2020
    Inventor: Fumiyuki KOBAYASHI
  • Publication number: 20190371240
    Abstract: The present application discloses a display device and a driving method thereof using the SSD method capable of charge with the data voltage in the pixel circuit and sufficient internal compensation even if the high resolution of a display image is improved. m demultiplexers corresponding to m sets of data signal line groups with k data signal lines being one set are provided. Each demultiplexer sets a prescribed period in a period after a time point when to start supplying a data signal output last in each of horizontal intervals among m data signals to a time point before a time point when to end supplying the data signal is set in advance as a delay period, and a scanning line drive circuit starts to select a scanning line corresponding to the pixel circuit to which the prescribed number of data signals are supplied, when the delay period of each of the horizontal intervals ends.
    Type: Application
    Filed: June 19, 2017
    Publication date: December 5, 2019
    Inventors: Masahiro MITANI, Fumiyuki KOBAYASHI, Makoto YOKOYAMA
  • Publication number: 20190288055
    Abstract: In a pixel circuit of a display device that includes an electro-optical element and a driving transistor, when a connection wiring line formed in a wiring line layer closer to a wiring line layer in which a first electrode of the electro-optical element is formed than a wiring line layer in which a control electrode of the driving transistor is formed is connected to the control electrode of the driving transistor, the first electrode of the electro-optical element is disposed so as not to overlap the connection wiring line in a plan view. In this way, a coupling capacitance between a node connected to the control electrode of the driving transistor and the first electrode of the electro-optical element is reduced, a step response of the display device is prevented, and power consumption of the display device is reduced.
    Type: Application
    Filed: September 29, 2017
    Publication date: September 19, 2019
    Inventors: Tamotsu SAKAI, Fumiyuki KOBAYASHI
  • Patent number: 10013921
    Abstract: A display apparatus and a display control circuit which may contain an occurrence of the inappropriate brightness, such as flickering, at the time of pausing driving are provided. A scan period (St1, St2) during which a display panel drive device scans a display panel device and a retention period (Vt1) during which the display panel drive device does not scan the display panel device alternate and a timing control device causes the display panel drive device to scan the display panel device a plurality of times in the scan period when at least the brightness (Lb1) of the backlight device is changed.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: July 3, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Asahi Yamato, Fumiyuki Kobayashi, Hikaru Kuki
  • Patent number: 9959825
    Abstract: A liquid crystal display device that performs intermittent driving involving a driving period and an idle period includes a gray scale level control unit that generates, from an input image signal, an image signal for display and an image signal for correction. A signal line control unit writes the image signal for correction to the plurality of signal lines before writing the image signal for display during a driving period. An LUT stores a correction gray scale value associated with a gray scale value of at least a current frame. An adding circuit corrects the input image signal based on the correction gray scale value read from the LUT. The subtracting circuit specifies, in a pixel region, a regular image pattern including at least a first pixel and a second pixel and changes an output from the adding circuit for the first image by a predetermined gray scale width.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: May 1, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki Kobayashi, Asahi Yamato, Akizumi Fujioka, Ken Inada
  • Patent number: 9865202
    Abstract: The invention provides a liquid crystal display device capable of preventing a reduction in display quality by suppressing the occurrence of flicker during alternating-voltage drive, as well as a method for driving the same. Overshoot drive is performed during a first frame period, which is shortened to such an extent that a “positive effective area” and a “negative effective area” are approximately equal in size. The duration of the first frame period is set to be greater than or equal to a quarter of one frame period at a refresh rate of 60 Hz but less than one frame period. This renders it possible to make adjustments such that luminance is inhibited from abruptly dropping immediately after a polarity change, and also luminance is prevented from becoming excessively high due to overshoot drive, and therefore, the occurrence of flicker due to flexoelectric polarization during alternating-voltage drive can be suppressed.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: January 9, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki Kobayashi, Asahi Yamato, Ken Inada
  • Publication number: 20170064112
    Abstract: An image processor includes a detector, a processor, and a generator. The detector is configured to detect whether a specific pattern is present at a first position in first image data. The processor is configured to generate data information, based on a detection result derived from the detector. The generator is configured to generate second image data by disposing the data information at a second position that corresponds to the first position.
    Type: Application
    Filed: June 17, 2016
    Publication date: March 2, 2017
    Applicant: Oki Data Corporation
    Inventor: Fumiyuki KOBAYASHI
  • Patent number: 9412324
    Abstract: A drive device of the present invention includes a VCOM selection circuit (122) for switching, before a display panel (102) is turned off, an electric potential of a counter electrode COM of each of pixels P from a VCOM1 to a VCOM2 which causes an electric potential of a drain electrode of each of the pixel P to be identical to the electric potential of the counter electrode COM after the display panel (102) is turned off.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: August 9, 2016
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki Kobayashi, Asahi Yamato, Kohzoh Takahashi, Taketoshi Nakano, Toshihiro Yanagi
  • Patent number: 9349338
    Abstract: A memory access section 16 writes, in a memory (10), a received image signal, in a case where a current frame is one that is located right before a frame in a scanning signal. On the other hand, the memory access section 16 does not write, in the memory (10), a received image signal, in a case where the current frame is one that is located right before a frame in a pause period. This allows a further reduction in electric power used to write, in the memory (10), an image signal received from outside.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: May 24, 2016
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki Kobayashi, Akizumi Fujioka, Asahi Yamato, Taketoshi Nakano, Toshihiro Yanagi
  • Publication number: 20160111047
    Abstract: A display apparatus and a display control circuit which may contain an occurrence of the inappropriate brightness, such as flickering, at the time of pausing driving are provided. A scan period (St1, St2) during which a display panel drive device scans a display panel device and a retention period (Vt1) during which the display panel drive device does not scan the display panel device alternate and a timing control device causes the display panel drive device to scan the display panel device a plurality of times in the scan period when at least the brightness (Lb1) of the backlight device is changed.
    Type: Application
    Filed: February 25, 2014
    Publication date: April 21, 2016
    Inventors: Asahi YAMATO, Fumiyuki KOBAYASHI, Hikaru KUKI
  • Publication number: 20160063933
    Abstract: The invention provides a liquid crystal display device capable of preventing a reduction in display quality by suppressing the occurrence of flicker during alternating-voltage drive, as well as a method for driving the same. Overshoot drive is performed during a first frame period, which is shortened to such an extent that a “positive effective area” and a “negative effective area” are approximately equal in size. The duration of the first frame period is set to be greater than or equal to a quarter of one frame period at a refresh rate of 60 Hz but less than one frame period. This renders it possible to make adjustments such that luminance is inhibited from abruptly dropping immediately after a polarity change, and also luminance is prevented from becoming excessively high due to overshoot drive, and therefore, the occurrence of flicker due to flexoelectric polarization during alternating-voltage drive can be suppressed.
    Type: Application
    Filed: February 24, 2014
    Publication date: March 3, 2016
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki KOBAYASHI, Asahi YAMATO, Ken INADA
  • Publication number: 20160055812
    Abstract: A liquid crystal display device that performs intermittent driving involving a driving period and an idle period includes a gray scale level control unit that generates, from an input image signal, an image signal for display and an image signal for correction. A signal line control unit writes the image signal for correction to the plurality of signal lines before writing the image signal for display during a driving period. An LUT stores a correction gray scale value associated with a gray scale value of at least a current frame. An adding circuit corrects the input image signal based on the correction gray scale value read from the LUT. The subtracting circuit specifies, in a pixel region, a regular image pattern including at least a first pixel and a second pixel and changes an output from the adding circuit for the first image by a predetermined gray scale width.
    Type: Application
    Filed: February 21, 2014
    Publication date: February 25, 2016
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki KOBAYASHI, Asahi YAMATO, Akizumi FUJIOKA, Ken INADA
  • Patent number: 9183797
    Abstract: Disclosed is a display device that (i) converts an input image formed of R, G, and B into a converted image formed of R, G, B, and W to display the converted image and that (ii) compresses the luminance of an input image for the subsequent frame on the basis of an adjustment value C which is corrected in correspondence with the number of, among all pixels in a converted image for the current frame, pixels in a state of luminance saturation and that then converts the input image into a converted image, the display device including a luminance oscillation detecting section (10) for detecting, while input images identical to each other are being inputted each as the above input image, whether converted images corresponding to the respective input images have an oscillating luminance, the display device, in the case where the luminance oscillation detecting section (10) has detected that the converted images have an oscillating luminance, stopping correction of the adjustment value C to fix the adjustment value C
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: November 10, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kohzoh Takahashi, Taketoshi Nakano, Asahi Yamato, Ken Inada, Fumiyuki Kobayashi, Toshihiro Yanagi
  • Patent number: 9171526
    Abstract: A display device includes a display panel having pixels each constituted by red, green, blue, and white subpixels and a backlight, further including: a grayscale ratio calculating section acquiring RGB data and calculating a ratio of the lowest to the highest of RGB grayscales in each pixel; a detection section detecting, from the RGB data, a ratio of the number of target pixels in one frame; a conversion coefficient calculating section acquiring, by using the detected ratio, a conversion coefficient for converting the RGB data into RGBW data; a RGB data conversion section converting the RGB data into the RGBW data per pixel by using the conversion coefficient; and a display control section generating, from the RGBW data, an image to be displayed on the display panel and causing the display panel to display the image.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: October 27, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Ken Inada, Fumiyuki Kobayashi
  • Patent number: 9165525
    Abstract: In an intermittent drive mode of a display device in which driving and pausing of the driving are repeated, an image identification section identifies an input image as a still image or a moving image. In a case where the moving image is identified, a drive/pause control section generates a drive/pause control signal with a period ratio in accordance with the moving image. A timing control section generates a driver control signal so that intermittent driving is carried out. Then, a source driver and a gate driver drives a display section so that the drive period and the pause period are repeated with a predetermined period ratio, so that the input image is displayed. The drive/pause control section sets a time ratio between the drive period and the pause period to be variable for each of the moving image and the still image.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: October 20, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki Kobayashi, Taketoshi Nakano, Asahi Yamato, Kohji Saitoh, Ken Inada, Kohzoh Takahashi, Toshihiro Yanagi
  • Patent number: 9123307
    Abstract: Provided is a display system (1) capable of further reducing electric power consumption. The display system (1) includes: a host device (2) including transceivers (Tx1, Tx2); a display device (3) including receivers (Rx1, Rx2); a plurality of interfaces (IF1, IF2) for transmitting image data from the transceivers (Tx1, Tx2) to the receivers (Rx1, Rx2); changing means for changing the number of transmission lanes to be used by each of the plurality of interfaces (IF1, IF2); and a display panel (5) provided in the display device (3). Each of the interfaces (IF1, IF2) transmits the image data at an identical transmission rate irrespective of the number of the transmission lanes to be used. The display panel (5) displays an image indicated by the image data, at a frame rate corresponding to the total number of the transmission lanes to be used by the each of the interfaces (IF1, IF2).
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: September 1, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiyuki Kobayashi, Kohji Saitoh, Masami Ozaki, Taketoshi Nakano, Toshihiro Yanagi
  • Publication number: 20150029175
    Abstract: A memory access section 16 writes, in a memory (10), a received image signal, in a case where a current frame is one that is located right before a frame in a scanning signal. On the other hand, the memory access section 16 does not write, in the memory (10), a received image signal, in a case where the current frame is one that is located right before a frame in a pause period. This allows a further reduction in electric power used to write, in the memory (10), an image signal received from outside.
    Type: Application
    Filed: February 22, 2013
    Publication date: January 29, 2015
    Inventors: Fumiyuki Kobayashi, Akizumi Fujioka, Asahi Yamato, Taketoshi Nakano, Toshihiro Yanagi
  • Publication number: 20150015555
    Abstract: A drive device of the present invention includes a VCOM selection circuit (122) for switching, before a display panel (102) is turned off, an electric potential of a counter electrode COM of each of pixels P from a VCOM1 to a VCOM2 which causes an electric potential of a drain electrode of each of the pixel P to be identical to the electric potential of the counter electrode COM after the display panel (102) is turned off.
    Type: Application
    Filed: February 21, 2013
    Publication date: January 15, 2015
    Inventors: Fumiyuki Kobayashi, Asahi Yamato, Kohzoh Takahashi, Taketoshi Nakano, Toshihiro Yanagi
  • Patent number: 8830684
    Abstract: A slide groove (27) is formed between opposed surfaces of an operation component case (11) and a display component case (12) coupled to each other so as to be slidable relative to each other. The slide groove (27) extends in single-layer space parallel to the opposed surfaces and is capable of storing a bundle of ultrafine coaxial cables (33). The slide groove extends portions of the ultrafine coaxial cables that have been drawn from cable holes (24, 28) opened in the opposed surfaces along the same sliding direction and stores the ultrafine coaxial cables in a state in which the ultrafine coaxial cables are curved in a plane direction between the opposed surfaces. The cable holes are opened at positions separated in the sliding direction at the beginning of sliding and at the end of sliding.
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: September 9, 2014
    Assignee: NEC Corporation
    Inventor: Fumiyuki Kobayashi
  • Publication number: 20140168197
    Abstract: Provided is a display system (1) capable of further reducing electric power consumption. The display system (1) includes: a host device (2) including transceivers (Tx1, Tx2); a display device (3) including receivers (Rx1, Rx2); a plurality of interfaces (IF1, IF2) for transmitting image data from the transceivers (Tx1, Tx2) to the receivers (Rx1, Rx2); changing means for changing the number of transmission lanes to be used by each of the plurality of interfaces (IF1, IF2); and a display panel (5) provided in the display device (3). Each of the interfaces (IF1, IF2) transmits the image data at an identical transmission rate irrespective of the number of the transmission lanes to be used. The display panel (5) displays an image indicated by the image data, at a frame rate corresponding to the total number of the transmission lanes to be used by the each of the interfaces (IF1, IF2).
    Type: Application
    Filed: August 7, 2012
    Publication date: June 19, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Fumiyuki Kobayashi, Kohji Saitoh, Masami Ozaki, Taketoshi Nakano, Toshihiro Yanagi