Patents by Inventor Toshihiro Yajima
Toshihiro Yajima 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).
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Publication number: 20240421265Abstract: The purpose is to reduce a color shift around an ultraviolet LED in a backlight using the ultraviolet LED and a QD sheet, viewed in a plane. The structure is: A display device having a display panel and a backlight, the backlight including a light source in which ultraviolet LEDs are arranged in a plane and in a matrix with a first interval, and a QD sheet covering the light source; the QD sheet being dispersed with red quantum dots, green quantum dots, and blue quantum dots, emitting light in response to ultraviolet light, the QD sheet having a first region and a second region arranged in a ring shape to surround the ultraviolet LED in a plan view, more of the red quantum dots, the green quantum dots, or the blue quantum dots being dispersed in the second region than in the first region.Type: ApplicationFiled: May 24, 2024Publication date: December 19, 2024Applicant: Japan Display Inc.Inventors: Toshihiro YAJIMA, Michihide SHIBATA, Takashi OTA
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Publication number: 20240288731Abstract: A backlight includes a light source in which blue LEDs are planarly arranged in a matrix with a first interval, and a color conversion sheet disposed covering the light source. First red quantum dots that receive blue light and emit red light, and first green quantum dots that receive blue light and emit green light are dispersed in the color conversion sheet. An RG quantum dot layer, in which second red quantum dots that receive blue light and emit red light and second green quantum dots that receive blue light and emit green light are dispersed, is disposed around each of the blue LEDs in planar view.Type: ApplicationFiled: February 9, 2024Publication date: August 29, 2024Inventors: Toshihiro YAJIMA, Michihide SHIBATA, Takashi OTA
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Publication number: 20240255799Abstract: The present invention has been made to reduce a yellow shift around blue LEDs in a backlight including the blue LEDs and a color conversion sheet. Provided is a backlight including a light source including blue LEDs arranged in a matrix, on a plane, at first intervals, and a color conversion sheet arranged to cover the light source, in which red quantum dots that emit red light in response to blue light and green quantum dots that emit green light in response to blue light are dispersed in the color conversion sheet, short-wavelength LEDs that emit light of a shorter wavelength than that of blue light are arranged near the blue LEDs, and blue quantum dots that emit blue light in response to the short-wavelength light are arranged in the color conversion sheet, at positions overlapping the short-wavelength LEDs in plan view.Type: ApplicationFiled: January 25, 2024Publication date: August 1, 2024Applicant: Japan Display Inc.Inventors: Toshihiro YAJIMA, Takashi OTA, Michihide SHIBATA
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Patent number: 11422298Abstract: According to one embodiment, an electronic device includes a liquid crystal panel and an illumination unit which illuminates the liquid crystal panel. The illumination unit includes a light guide comprising a first side surface, a main surface opposing the liquid crystal panel and an opening made by a notch or a through hole, a first light source opposing to the first side surface, and a second light source provided closer to the opening than to the first light source.Type: GrantFiled: February 25, 2021Date of Patent: August 23, 2022Assignee: Japan Display Inc.Inventors: Takashi Ota, Kazutaka Nagaoka, Michihide Shibata, Toshihiro Yajima
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Publication number: 20220066266Abstract: According to one embodiment, an illuminating device includes a wiring substrate, light emitting elements, a wavelength conversion element, and a protrusion. A main surface of the wiring substrate is divided into segment areas. N light emitting elements are disposed in each of the segment areas. N is greater than 1. The light emitting elements are driven independently in units of the segment areas. The protrusion protrudes from the wiring substrate toward the wavelength conversion element between two segment areas adjacent to each other.Type: ApplicationFiled: November 12, 2021Publication date: March 3, 2022Applicant: Japan Display Inc.Inventors: Takashi OTA, Masafumi OKADA, Toshihiro YAJIMA
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Publication number: 20210181402Abstract: According to one embodiment, an electronic device includes a liquid crystal panel and an illumination unit which illuminates the liquid crystal panel. The illumination unit includes a light guide comprising a first side surface, a main surface opposing the liquid crystal panel and an opening made by a notch or a through hole, a first light source opposing to the first side surface, and a second light source provided closer to the opening than to the first light source.Type: ApplicationFiled: February 25, 2021Publication date: June 17, 2021Applicant: Japan Display Inc.Inventors: Takashi OTA, Kazutaka NAGAOKA, Michihide SHIBATA, Toshihiro YAJIMA
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Patent number: 9925603Abstract: A processing method for a surface of a workpiece using a rotating cutting tool, includes a processing method for forming a cut pattern by rotationally cutting a surface of a workpiece using a rotating cutting tool having cutting edges extending in a rotation axis direction at a plurality of circumferentially separated positions on an outer circumference of a body thereof. Each of the cutting edges includes a plurality of segmental edges segmented at an equal pitch in the rotation axis direction. A ratio of depth d to width W (d/W) of a knife mark formed on the surface of the workpiece by the segmental edges is not less than 3/100.Type: GrantFiled: October 31, 2014Date of Patent: March 27, 2018Assignee: KANEFUSA KABUSHIKI KAISHAInventor: Toshihiro Yajima
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Publication number: 20160263667Abstract: A processing method for a surface of a workpiece using a rotating cutting tool, includes a processing method for forming a cut pattern by rotationally cutting a surface of a workpiece using a rotating cutting tool having cutting edges extending in a rotation axis direction at a plurality of circumferentially separated positions on an outer circumference of a body thereof Each of the cutting edges includes a plurality of segmental edges segmented at an equal pitch in the rotation axis direction. A ratio of depth d to width W (d/W) of a knife mark formed on the surface of the workpiece by the segmental edges is not less than 3/100.Type: ApplicationFiled: October 31, 2014Publication date: September 15, 2016Applicant: KANEFUSA KABUSHIKI KAISHAInventor: Toshihiro YAJIMA
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Patent number: 8164711Abstract: A liquid crystal display device which can make the surface brightness of an edge-light-type backlight uniform is provided. The liquid crystal display device includes a liquid crystal display panel and a backlight which radiates light to the liquid crystal display panel. The backlight includes a light guide plate which is arranged on a back side of the liquid crystal display panel, a light source arranged on an outer peripheral portion of a first main surface of the light guide plate which faces the liquid crystal display panel in an opposed manner, and a reflection sheet which is arranged on a back side of the light guide plate as viewed from the liquid crystal display panel. The light guide plate is made of a transparent resin having a refractive index of 1.53 or less.Type: GrantFiled: May 12, 2009Date of Patent: April 24, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Yasuhisa Shiraishi, Atsushi Tsuruoka, Akiyoshi Tobe, Shigeki Nishizawa, Toshihiro Yajima
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Patent number: 7990361Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: March 6, 2009Date of Patent: August 2, 2011Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Publication number: 20090284688Abstract: A liquid crystal display device which can make the surface brightness of an edge-light-type backlight uniform is provided. The liquid crystal display device includes a liquid crystal display panel and a backlight which radiates light to the liquid crystal display panel. The backlight includes a light guide plate which is arranged on a back side of the liquid crystal display panel, a light source arranged on an outer peripheral portion of a first main surface of the light guide plate which faces the liquid crystal display panel in an opposed manner, and a reflection sheet which is arranged on a back side of the light guide plate as viewed from the liquid crystal display panel. The light guide plate is made of a transparent resin having a refractive index of 1.53 or less.Type: ApplicationFiled: May 12, 2009Publication date: November 19, 2009Inventors: Yasuhisa SHIRAISHI, Atsushi Tsuruoka, Akiyoshi Tobe, Shigeki Nishizawa, Toshihiro Yajima
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Publication number: 20090174644Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: ApplicationFiled: March 6, 2009Publication date: July 9, 2009Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 7518594Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed behind the liquid crystal display panel. The backlight includes: a light source including a discharge tube having no electrodes therein, and first and second electrodes disposed outside the discharge tube; and a power source which supplies first and second high-frequency voltages to the first and second electrodes, respectively. The first and second electrodes are disposed at two ends of the discharge tube in a direction of a longitudinal axis thereof, respectively. A length of a first wiring for coupling the power source to the first electrode is approximately equal to a length of a second wiring for coupling the power source to the second electrode.Type: GrantFiled: April 4, 2007Date of Patent: April 14, 2009Assignees: Hitachi, Ltd., Hitachi Electronic Devices, Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Publication number: 20070182702Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed behind the liquid crystal display panel. The backlight includes: a light source including a discharge tube having no electrodes therein, and first and second electrodes disposed outside the discharge tube; and a power source which supplies first and second high-frequency voltages to the first and second electrodes, respectively. The first and second electrodes are disposed at two ends of the discharge tube in a direction of a longitudinal axis thereof, respectively. A length of a first wiring for coupling the power source to the first electrode is approximately equal to a length of a second wiring for coupling the power source to the second electrode.Type: ApplicationFiled: April 4, 2007Publication date: August 9, 2007Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 7218308Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: August 26, 2005Date of Patent: May 15, 2007Assignees: Hitachi, Ltd., Hitachi Electronic Devices, Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 7061465Abstract: There is provided a liquid crystal display device having a longer useful life and in which its so-called picture frame area can be narrowed. The liquid crystal display device includes a liquid crystal display panel having a display part in its central portion and a backlight disposed on a back side of the liquid crystal display panel. The backlight includes a discharge tube having electrodes at least at its opposite ends, and the electrodes are disposed at the exterior of the discharge tube. The opposite end portions of the discharge tube where the respective electrodes are disposed are positioned to be superposed on the periphery of the liquid crystal display panel and are bent with an angle with respect to the central axis of the discharge tube.Type: GrantFiled: August 31, 2001Date of Patent: June 13, 2006Assignees: Hitachi, Ltd., Hitachi Electronics Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Shoichi Noguchi, Yoshiharu Takeda
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Publication number: 20050280625Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: ApplicationFiled: August 26, 2005Publication date: December 22, 2005Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 6956556Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: May 17, 2001Date of Patent: October 18, 2005Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Publication number: 20020041268Abstract: There is provided a liquid crystal display device which can be lengthened in life and in which the area of its so-called a picture frame can be narrowed. The liquid crystal display device includes a liquid crystal display panel having a display part in its central portion except its periphery; and a backlight disposed on a back side of the liquid crystal display panel. The backlight includes a discharge tube having electrodes at at least its opposite ends, and the electrodes are disposed at the exterior of the discharge tube. The opposite end portions of the discharge tube where the respective electrodes are disposed are positioned to be superposed on the periphery of the liquid crystal display panel, and are bent with an angle with respect to the central axis of the discharge tube.Type: ApplicationFiled: August 31, 2001Publication date: April 11, 2002Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Shoichi Noguchi, Yoshiharu Takeda
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Publication number: 20010050735Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: ApplicationFiled: May 17, 2001Publication date: December 13, 2001Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba