Patents by Inventor Seiji Kohashikawa

Seiji Kohashikawa 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: 20140340437
    Abstract: A display device uses a plurality of monitors to constitute a single image, achieves high contrast and, suppresses variations in luminance among the monitors. Each monitor is provided with an image analysis portion that finds a first feature quantity in a video display region corresponding to a region of an LED backlight, and a gradation control portion that determines a first luminance level for the corresponding LEDs region and calculates a luminance stretch quantity for stretching the first luminance levels uniformly. A microcomputer selects a minimum luminance stretch quantity from among the monitors and outputs the selected minimum luminance stretch quantity to the monitors. The gradation control portion for each monitor stretches the first luminance levels uniformly to determine a second luminance level on the basis of the minimum luminance stretch quantity acquired from the microcomputer.
    Type: Application
    Filed: August 22, 2012
    Publication date: November 20, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: Seiji Kohashikawa
  • Patent number: 8780267
    Abstract: It is an object to prevent the image quality deterioration of a moving image likely to include a plurality of the same consecutive images such as a movie video and an animation video due to the motion-compensated frame rate conversion (FRC) processing. An image displaying device is provided with an FRC portion (10) for converting the number of frames in an input image signal by interpolating an image signal to which a motion compensation processing has been given between the frames in the input image signal, a genre determining portion (14) for determining whether the input image signal is a predetermined genre, and a controlling portion (15).
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: July 15, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Mori, Seiji Kohashikawa, Hiroyuki Furukawa, Masafumi Ueno, Kenichiroh Yamamoto, Takashi Yoshii
  • Patent number: 8547404
    Abstract: A liquid crystal display apparatus enables image display with optimum quality corresponding to the genre of an image to be displayed. The liquid crystal display apparatus controls the emission luminance of a backlight according to the APL of an image signal measured at an APL measuring portion 14. Upon emission luminance control, the display apparatus sets the follow performance of a change of the backlight emission luminance in following a change in a characteristic quantity of the image signal according to a genre so that the display image can be viewed without an odd feeling. Specifically, the APL of the image signal measured at the APL measuring portion 14 is put into a filter 15, and the rate of a change in the APL on the time axis is controlled through weighted averaging to control the follow performance of the emission luminance control on the backlight.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: October 1, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Toshiyuki Fujine, Seiji Kohashikawa
  • Patent number: 8384826
    Abstract: Deterioration of the image quality of a moving image which is deteriorated due to a motion-compensated frame rate conversion (FRC) processing is prevented. An image display device comprises an FRC portion (10) for converting the number of frames of an input image signal by interpolating an image signal to which the motion compensation processing is performed between frames of the input image signal and a controlling portion (15) for controlling the operation of the FRC portion (10) after determining whether or not the degree of deterioration of the input image signal is equal to or higher than a predetermined value.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: February 26, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Mori, Seiji Kohashikawa
  • Patent number: 8384654
    Abstract: The present invention provides a display device capable of realizing an appropriate screen display luminance in accordance with a video feature quantity and brightness around and sufficiently reducing power consumption. A liquid crystal display apparatus (1) includes: a liquid crystal panel (20) for displaying a video by an input video signal; a backlight unit (17) as a light source for irradiating the liquid crystal panel (20); and a brightness sensor (24) for detecting the brightness around the liquid crystal display apparatus (1). According to the brightness detected by the brightness sensor (24), luminance conversion characteristic defining the light emission luminance of the backlight for the feature quantity (such as APL) of the input video signal is changed.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: February 26, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Toshiyuki Fujine, Seiji Kohashikawa, Yuhya Sekiguchi, Yuhichiro Yamaguchi
  • Publication number: 20130010206
    Abstract: Disclosed is a liquid crystal display device (1) provided with a liquid crystal panel (13) for displaying an input video signal, a backlight (10) applying light to the liquid crystal panel, a light source light emission control portion providing light emission of the backlight (10), and an area detection portion (11c) detecting a translating area (13T) translating in a video indicated by the input video signal. The translating area (13T) means, for example, a panning video, a scroll area, and a telop area. The light source light emission control portion is exemplified by a control CPU (15) and a light source drive portion (16). The control CPU (15) performs light emission control of light emitting areas (10a-10g) by controlling the light source driving portion (16), the light emission control including intermittent control.
    Type: Application
    Filed: March 29, 2011
    Publication date: January 10, 2013
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: Seiji Kohashikawa
  • Patent number: 8325272
    Abstract: It is an object to prevent the image quality deterioration of a moving image likely to include a plurality of the same consecutive images such as 2-3 or 2-2 pulldown video due to the motion-compensated frame rate conversion (FRC) processing. An image displaying device is provided with an FRC portion (10) for converting the number of frames in an input image signal by interpolating an image signal to which a motion compensation processing has been given between the frames in the input image signal, a pulldown detecting portion (14) for detecting whether the input image signal is an image signal to which pulldown conversion has been performed, and a controlling portion (15).
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: December 4, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Mori, Seiji Kohashikawa, Hiroyuki Furukawa, Masafumi Ueno, Kenichiroh Yamamoto, Takashi Yoshii
  • Patent number: 8232956
    Abstract: A video with a display definition most suitable for the type of the video content to be displayed can be displayed. A liquid crystal display apparatus controls the luminance of the backlight light source according to the APL of the video signal measured by an APL measuring portion (16). The range of the video signal the APL of which is measured can be determined by, e.g., the luminance level of the video signal or by the genre information included in the inputted video signal or the OSD display information used when the liquid crystal apparatus (1) performs OSD display. The drawing shows the state that the upper and lower non-video areas are removed and an effective video area is determined. With this, the additional information displayed when the video signal is of a specific genre and the OSD-displayed additional information can be excluded, and the luminance of the backlight light source can be controlled to realize a display definition most suitable for the video signal.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: July 31, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Toshiyuki Fujine, Seiji Kohashikawa
  • Patent number: 8228427
    Abstract: It is an object to prevent the image quality deterioration of a moving image likely to include a plurality of the same consecutive images such as a movie video image or a CG video image due to the motion-compensated frame rate conversion (FRC) processing. An image displaying device is provided with an FRC portion (10) for converting the number of frames in an input image signal by interpolating an image signal to which a motion compensation processing has been given between the frames in the input image signal, a controlling portion (14) for controlling each portion according to an image tone mode selected by a user.
    Type: Grant
    Filed: April 6, 2007
    Date of Patent: July 24, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Mori, Seiji Kohashikawa, Hiroyuki Furukawa, Masafumi Ueno, Kenichiroh Yamamoto, Takashi Yoshii
  • Patent number: 8089449
    Abstract: Provided is a liquid crystal display apparatus capable of stopping the brightness control of a back light source on the featuring quantity of an input video signal, in case a multi-plane display was performed. The liquid crystal display apparatus comprises a liquid crystal panel (6) for displaying a picture, a light source for irradiating the liquid crystal panel (6), a backlight unit (7) for controlling the light source, a two-plane control unit (3), and a brightness control unit (4). In accordance with the featuring quantity of the input video signal, the brightness control unit (4) performs the control of the emitting brightness of the back light source, upon the backlight unit (7).
    Type: Grant
    Filed: February 5, 2007
    Date of Patent: January 3, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiji Kohashikawa, Yuhya Sekiguchi, Yuhichiro Yamaguchi
  • Patent number: 7839091
    Abstract: A light emission device capable of holding a uniform color in various environments is provided. A light source control device has a light detection device for detecting emission brightness of light sources that emit different colors and controlling emission brightness of at least one light source of the light sources based on the detection result of the light detection device. A through-hole is formed in a reflection member for reflecting light emitted from the light source, and the reflection is in a predetermined direction. The light detection device is provided across the reflection member from the light source, and the light propagation member is provided at the through-hole.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: November 23, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiji Kohashikawa, Toshiyuki Fujine
  • Publication number: 20100039557
    Abstract: It is an object to prevent the image quality deterioration of a moving image likely to include a plurality of the same consecutive images such as a movie video and an animation video due to the motion-compensated frame rate conversion (FRC) processing. An image displaying device is provided with an FRC portion (10) for converting the number of frames in an input image signal by interpolating an image signal to which a motion compensation processing has been given between the frames in the input image signal, a genre determining portion (14) for determining whether the input image signal is a predetermined genre, and a controlling portion (15).
    Type: Application
    Filed: April 4, 2007
    Publication date: February 18, 2010
    Inventors: Takeshi Mori, Seiji Kohashikawa, Hiroyuki Furukawa, Masafumi Ueno, Kenichiroh Yamamoto, Takashi Yoshii
  • Publication number: 20100020232
    Abstract: It is an object to prevent the image quality deterioration of a moving image likely to include a plurality of the same consecutive images such as 2-3 or 2-2 pulldown video due to the motion-compensated frame rate conversion (FRC) processing. An image displaying device is provided with an FRC portion (10) for converting the number of frames in an input image signal by interpolating an image signal to which a motion compensation processing has been given between the frames in the input image signal, a pulldown detecting portion (14) for detecting whether the input image signal is an image signal to which pulldown conversion has been performed, and a controlling portion (15).
    Type: Application
    Filed: April 10, 2007
    Publication date: January 28, 2010
    Inventors: Takeshi Mori, Seiji Kohashikawa, Hiroyuki Furukawa, Masafumi Ueno, Kenichiroh Yamamoto, Takashi Yoshii
  • Publication number: 20100007789
    Abstract: Deterioration of the image quality of a moving image which is deteriorated due to a motion-compensated frame rate conversion (FRC) processing is prevented. An image display device comprises an FRC portion (10) for converting the number of frames of an input image signal by interpolating an image signal to which the motion compensation processing is performed between frames of the input image signal and a controlling portion (15) for controlling the operation of the FRC portion (10) after determining whether or not the degree of deterioration of the input image signal is equal to or higher than a predetermined value.
    Type: Application
    Filed: April 10, 2007
    Publication date: January 14, 2010
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi Mori, Seiji Kohashikawa
  • Publication number: 20090268105
    Abstract: Provided is a liquid crystal display device capable of stopping the emitting luminance control of a backlight source on the APL of an input video signal in accordance with an input mode. The liquid crystal display device comprises a liquid crystal panel (7) for displaying a picture, a backlight source for irradiating the liquid crystal panel (7), and a luminance controlling portion (5) for controlling the light source. The luminance controlling portion (5) performs the emitting luminance control of the backlight source according to the featuring quantity of the input video signal, upon a backlight unit (8). In case an input mode (e.g., a PC input mode or a game input mode) to input a predetermined video signal other than the input mode to input a television video signal is selected, the luminance controlling portion (5) controls the backlight unit (8) so that the emitting luminance of the backlight source may be kept constant irrespective of the featuring quantity of the input video signal.
    Type: Application
    Filed: February 5, 2007
    Publication date: October 29, 2009
    Inventors: Seiji Kohashikawa, Yuhya Sekiguchi, Yuhichiro Yamaguchi
  • Publication number: 20090268089
    Abstract: It is an object to prevent the image quality deterioration of a moving image likely to include a plurality of the same consecutive images such as a movie video image or a CG video image due to the motion-compensated frame rate conversion (FRC) processing. An image displaying device is provided with an FRC portion (10) for converting the number of frames in an input image signal by interpolating an image signal to which a motion compensation processing has been given between the frames in the input image signal, a controlling portion (14) for controlling each portion according to an image tone mode selected by a user.
    Type: Application
    Filed: April 6, 2007
    Publication date: October 29, 2009
    Inventors: Takeshi Mori, Seiji Kohashikawa, Hiroyuki Furukawa, Masafumi Ueno, Kenichiroh Yamamoto, Takashi Yoshii
  • Publication number: 20090262063
    Abstract: The present invention provides a display device capable of realizing an appropriate screen display luminance in accordance with a video feature quantity and brightness around and sufficiently reducing power consumption. A liquid crystal display apparatus (1) includes: a liquid crystal panel (20) for displaying a video by an input video signal; a backlight unit (17) as a light source for irradiating the liquid crystal panel (20); and a brightness sensor (24) for detecting the brightness around the liquid crystal display apparatus (1). According to the brightness detected by the brightness sensor (24), luminance conversion characteristic defining the light emission luminance of the backlight for the feature quantity (such as APL) of the input video signal is changed.
    Type: Application
    Filed: November 1, 2006
    Publication date: October 22, 2009
    Inventors: Toshiyuki Fujine, Seiji Kohashikawa, Yuhya Sekiguchi, Yuhichiro Yamaguchi
  • Publication number: 20090174636
    Abstract: It is possible to perform an optimal video expression in accordance with a change of a feature quantity of a video signal without lowering the display quality and reduce power consumption. As the video feature quantity, for example, APL is used. When the feature quantity is greater than a first predetermined value p1, as the feature quantity increases, the emission brightness of a light source is made smaller. Moreover, in the region where the feature quantity is smaller than the predetermined value p1, as the feature quantity decreases, the emission brightness of the light source is made smaller. Moreover, when the feature quantity is equal to the predetermined value p1, the emission brightness of the light source is made maximum. Moreover, when the feature quantity is greater than a second predetermined value p2, as the feature quantity increases, the ratio of decrease of the emission brightness of the light source is made greater.
    Type: Application
    Filed: February 5, 2007
    Publication date: July 9, 2009
    Inventors: Seiji Kohashikawa, Yuhya Sekiguchi, Yuhichiro Yamaguchi
  • Publication number: 20090146941
    Abstract: A video with a display definition most suitable for the type of the video content to be displayed can be displayed. A liquid crystal display apparatus controls the luminance of the backlight light source according to the APL of the video signal measured by an APL measuring portion (16). The range of the video signal the APL of which is measured can be determined by, e.g., the luminance level of the video signal or by the genre information included in the inputted video signal or the OSD display information used when the liquid crystal apparatus (1) performs OSD display. The drawing shows the state that the upper and lower non-video areas are removed and an effective video area is determined. With this, the additional information displayed when the video signal is of a specific genre and the OSD-displayed additional information can be excluded, and the luminance of the backlight light source can be controlled to realize a display definition most suitable for the video signal.
    Type: Application
    Filed: October 16, 2006
    Publication date: June 11, 2009
    Inventors: Toshiyuki Fujine, Seiji Kohashikawa
  • Publication number: 20090140656
    Abstract: A light emission device capable of holding a uniform color in various environments. A light source control device has a light detection device for detecting emission brightness of light sources that emit different colors and controlling emission brightness of at least one light source of the light sources based on the detection result of the light detection device. A through-hole is formed in a reflection member for reflecting light emitted from the light source, and the reflection is in a predetermined direction. The light detection device is provided across the reflection member from the light source, and the light propagation member is provided at the through-hole.
    Type: Application
    Filed: February 3, 2006
    Publication date: June 4, 2009
    Inventors: Seiji Kohashikawa, Toshiyuki Fujine