Patents by Inventor Katsuaki Yamada
Katsuaki Yamada 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: 20240088884Abstract: A semiconductor device includes: a first output transistor and a second output transistor configured to be connected between a first terminal and second terminal; an active clamp circuit configured to be connected to a first control terminal of the first output transistor to limit a terminal-to-terminal voltage appearing between the first and second terminals to a clamp voltage or less; a first variable resistive element provided between a node configured to be fed with a control signal and the first control terminal; a second variable resistive element provided between the node and a second control terminal of the second output transistor; and a turn-off circuit configured to be connected to a connection node between the second variable resistive element and the second control terminal so as to be able to turn the second output transistor off.Type: ApplicationFiled: September 12, 2023Publication date: March 14, 2024Inventors: Katsuaki YAMADA, Makoto SADA, Toru TAKUMA
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Publication number: 20240007103Abstract: A switching device includes: an N-type semiconductor substrate; a power MISFET having the N-type semiconductor substrate as its drain; an input electrode receiving an input signal; a control circuit generating a gate control signal for the power MISFET according to the input signal; and a negative current prevention circuit provided between the input electrode and the control circuit. The negative current prevention circuit includes: a P-channel MISFET connected, with its drain toward the input electrode and its source and back gate toward the control circuit, between the input electrode and the control circuit, with its gate fed with a fixed potential, with the potential at its back gate separated from the potential of the N-type semiconductor substrate; and a diode connected, with its anode toward the input electrode and its cathode toward the control circuit, between the input electrode and the control circuit.Type: ApplicationFiled: September 15, 2023Publication date: January 4, 2024Inventors: Katsuaki YAMADA, Shuntaro TAKAHASHI, Muga IMAMURA
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Publication number: 20230378018Abstract: A semiconductor device includes: a substrate; a device region provided in the substrate; a terminal covering the device region in a plan view; a plurality of pseudo-bumps densely arranged on the terminal in a state of being opened from a wire; and at least one genuine bump arranged more sparsely than the plurality of the pseudo-bumps on the terminal in a state of being connected to the wire.Type: ApplicationFiled: May 15, 2023Publication date: November 23, 2023Applicant: ROHM CO., LTD.Inventors: Hajime OKUDA, Yuto NISHIYAMA, Toru TAKUMA, Katsuaki YAMADA
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Patent number: 11604383Abstract: A display device includes a housing, a display panel, a light source, a first acquirer, a second acquirer, and a stabilizer. The display panel is provided in the housing. The light source is provided in the housing, and includes an LED that irradiates the display panel with light. The first acquirer acquires a first temperature in a first region including a region where the light source is disposed in the housing. The second acquirer acquires a second temperature in a second region different from the first region. The stabilizer has a first adjustment mode for lighting the LED with maximum luminance as an adjustment mode for stabilizing luminance of the LED. The stabilizer operates the LED in the first adjustment mode in a case where a temperature difference between the first temperature and the second temperature is a first threshold value or more.Type: GrantFiled: April 20, 2022Date of Patent: March 14, 2023Assignee: SHARP KABUSHIKI KAISHAInventors: Masaki Nishizaka, Katsuaki Yamada, Tomohiko Okada, Wooseong Jeong, Toshiyuki Gotoh, Hidenori Ishii
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Publication number: 20220352145Abstract: For example, a semiconductor device includes an output electrode to be connected to an inductive load, a ground electrode to be connected to a ground terminal, first and second transistors connected in parallel between the output and ground electrodes, an active clamp circuit connected to the gate of the first transistor, and a gate control circuit to control the gates of the first and second transistors to keep the first and second transistors on in a first operation state and off in a second operation state. After a transition from the first operation state to the second, before the active clamp circuit operates, the gate control circuit short-circuits between the gate and source of the second transistor.Type: ApplicationFiled: July 22, 2020Publication date: November 3, 2022Inventors: Toru Takuma, Katsuaki YAMADA
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Publication number: 20220342261Abstract: A display device includes a housing, a display panel, a light source, a first acquirer, a second acquirer, and a stabilizer. The display panel is provided in the housing. The light source is provided in the housing, and includes an LED that irradiates the display panel with light. The first acquirer acquires a first temperature in a first region including a region where the light source is disposed in the housing. The second acquirer acquires a second temperature in a second region different from the first region. The stabilizer has a first adjustment mode for lighting the LED with maximum luminance as an adjustment mode for stabilizing luminance of the LED. The stabilizer operates the LED in the first adjustment mode in a case where a temperature difference between the first temperature and the second temperature is a first threshold value or more.Type: ApplicationFiled: April 20, 2022Publication date: October 27, 2022Inventors: Masaki NISHIZAKA, Katsuaki YAMADA, Tomohiko OKADA, Wooseong JEONG, Toshiyuki GOTOH, Hidenori ISHII
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Patent number: 8382307Abstract: A lighting device includes a light source lamp, and a light-diffusing layer including a diffusing plate or a diffusing sheet, the light source lamp including a folded portion (curved portion), such as U-shaped tube, and the lighting device for display devices having any of, or a combination of: the folded portion of the light source lamp is covered with a lamp frame; an optical member provided with a light-reducing or light-shielding treatment is around the folded portion of the light source lamp; the folded portion of the light source lamp is outside an effective display region; the folded portion of the light source lamp includes a member reducing or shielding light; and a reflective member with a light-reducing treatment around the folded portion of the light source lamp. As a result, at least part of light generated from the curved portion of the light source lamp is reduced or shielded.Type: GrantFiled: September 23, 2011Date of Patent: February 26, 2013Assignee: Sharp Kabushiki KaishaInventors: Yoshiki Takata, Katsuaki Yamada
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Publication number: 20120243209Abstract: A lighting device includes a light source lamp, and a light-diffusing layer including a diffusing plate or a diffusing sheet, the light source lamp including a folded portion (curved portion), such as U-shaped tube, and the lighting device for display devices having any of, or a combination of: the folded portion of the light source lamp is covered with a lamp frame; an optical member provided with a light-reducing or light-shielding treatment is around the folded portion of the light source lamp; the folded portion of the light source lamp is outside an effective display region; the folded portion of the light source lamp includes a member reducing or shielding light; and a reflective member with a light-reducing treatment around the folded portion of the light source lamp. As a result, at least part of light generated from the curved portion of the light source lamp is reduced or shielded.Type: ApplicationFiled: September 23, 2011Publication date: September 27, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Yoshiki TAKATA, Katsuaki YAMADA
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Patent number: 8066395Abstract: A display device comprising: a display panel including a display region; a plurality of light source lamps arranged to emit light toward the display region, each of the plurality of the light source lamps including a folded portion or a curved portion located at least partially outside of the display region and arranged along to an edge of the display panel; and a reflective surface underlying the light source lamps, the reflective surface including a first region with a first reflectance located in an area extending along said edge of the display panel and outside of the display region, and a second region with a second reflectance higher than the first reflectance.Type: GrantFiled: December 8, 2009Date of Patent: November 29, 2011Assignee: Sharp Kabushiki KaishaInventors: Yoshiki Takata, Katsuaki Yamada
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Publication number: 20100085736Abstract: A lighting device for display devices preferably used for constituting a backlight of a transmissive or transflective liquid crystal display device includes a light source lamp, and a light-diffusing layer constituted by a diffusing plate or a diffusing sheet, the light source lamp being a light source lamp having a folded portion (curved portion), such as U-shaped tube, and the lighting device for display devices having any of, or a combination of: a configuration in which the folded portion (curved portion) of the light source lamp is covered with a lamp frame; a configuration in which an optical member provided with a light-reducing or light-shielding treatment is used around the folded portion (curved portion) of the light source lamp; a configuration in which the folded portion (curved portion) of the light source lamp is disposed outside an effective display region; a configuration in which the folded portion (curved portion) of the light source lamp is provided with a member for reducing or shielding lType: ApplicationFiled: December 8, 2009Publication date: April 8, 2010Applicant: SHARP KABUSHIKI KAISHAInventors: Yoshiki TAKATA, Katsuaki YAMADA
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Patent number: 7651233Abstract: A lighting device for display devices preferably used for constituting a backlight of a transmissive or transflective liquid crystal display device includes a light source lamp, and a light-diffusing layer constituted by a diffusing plate or a diffusing sheet, the light source lamp being a light source lamp having a folded portion(curved portion), such as U-shaped tube, and the lighting device for display devices having any of, or a combination of: a configuration in which the folded portion (curved portion) of the light source lamp is covered with a lamp frame; a configuration in which an optical member provided with a light-reducing or light-shielding treatment is used around the folded portion (curved portion) of the light source lamp; a configuration in which the folded portion (curved portion) of the light source lamp is disposed outside an effective display region; a configuration in which the folded portion (curved portion) of the light source lamp is provided with a member for reducing or shielding liType: GrantFiled: November 18, 2004Date of Patent: January 26, 2010Assignee: Sharp Kabushiki KaishaInventors: Yoshiki Takata, Katsuaki Yamada
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Publication number: 20070165156Abstract: A lighting device for display devices preferably used for constituting a backlight of a transmissive or transflective liquid crystal display device includes a light source lamp, and a light-diffusing layer constituted by a diffusing plate or a diffusing sheet, the light source lamp being a light source lamp having a folded portion(curved portion), such as U-shaped tube, and the lighting device for display devices having any of, or a combination of: a configuration in which the folded portion (curved portion) of the light source lamp is covered with a lamp frame; a configuration in which an optical member provided with a light-reducing or light-shielding treatment is used around the folded portion (curved portion) of the light source lamp; a configuration in which the folded portion (curved portion) of the light source lamp is disposed outside an effective display region; a configuration in which the folded portion (curved portion) of the light source lamp is provided with a member for reducing or shielding liType: ApplicationFiled: November 18, 2004Publication date: July 19, 2007Applicant: SHARP KABUSHIKI KAISHAInventors: Yoshiki Takata, Katsuaki Yamada
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Patent number: 7130005Abstract: An object of the invention is to provide a flat-panel display device, which has a sufficient shockproof characteristic and in which the number of component parts can be reduced so as to lower in cost. A chassis for a flat-panel display device in accordance with the invention supports a component member such as a flat-panel display element 500, and is characterized in that a main body of the chassis 100 comprises a plurality of roughly triangle openings 120 at least one side of which is adjacent and roughly parallel to a side of another opening 120 or an outer edge of the main body of the chassis 100.Type: GrantFiled: February 17, 2004Date of Patent: October 31, 2006Assignee: Sharp Kabushiki KaishaInventors: Yoshiki Takata, Yusuke Ota, Katsuaki Yamada, Kenichi Iwamoto
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Patent number: 7060367Abstract: A blade with improved sharpness and durability is disclosed. The blade includes a base plate having an edge and a coating layer for coating the edge. The coating layer is formed of a material handling metal, and a tip of the coating layer is sharpened. It is preferred that an angle (Ba) between two tapered surfaces be between 15 to 45 degrees.Type: GrantFiled: June 4, 2001Date of Patent: June 13, 2006Assignee: Kai R&D Center Co., Ltd.Inventors: Katsuaki Yamada, Hiroshi Ohtsubo, Hiroyuki Tashita
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Patent number: 6942353Abstract: A backlight unit a light source for originating light; a light guide plate including incident portions through which light originated form the light source enters and an emitting portion form emitting the entered light; and a chassis including a first recessed portion having a first depth and on which the light source is located and a second recessed portion having a second depth deeper than the first depth and a sice adjusted for the light guide plate and on which the light guide plate is located.Type: GrantFiled: September 24, 2003Date of Patent: September 13, 2005Assignee: Sharp Kabushiki KaishaInventors: Katsuaki Yamada, Kenichi Iwamoto, Yoshiki Takata, Kentaroh Aoki, Yuhsuke Ohta
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Publication number: 20040263713Abstract: An object of the invention is to provide a flat-panel display device, which has a sufficient shockproof characteristic and in which the number of component parts can be reduced so as to lower in cost. A chassis for a flat-panel display device in accordance with the invention supports a component member such as a flat-panel display element 500, and is characterized in that a main body of the chassis 100 comprises a plurality of roughly triangle openings 120 at least one side of which is adjacent and roughly parallel to a side of another opening 120 or an outer edge of the main body of the chassis 100.Type: ApplicationFiled: February 17, 2004Publication date: December 30, 2004Inventors: Yoshiki Takata, Yusuke Ota, Katsuaki Yamada, Kenichi Iwamoto
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Publication number: 20040099120Abstract: A blade (1) with improved sharpness and durability is disclosed. The blade includes a base plate (3) having an edge and a coating layer (6) for coating the edge. The coating layer is formed of a material including metal, and a tip of the coating layer (2a) is sharpened. It is preferred that an angle (&bgr;a) between two tapered surfaces (7a, 8a) be between 15 to 45 degrees.Type: ApplicationFiled: December 5, 2002Publication date: May 27, 2004Inventors: Katsuaki Yamada, Hiroshi Ohtsubo, Hiroyuki Tashita
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Publication number: 20040062030Abstract: A backlight unit comprises: a light source for originating light; a light guide plate including incident portions through which light originated from the light source enters and an emitting portion for emitting the entered light; and a chassis including a first recessed portion having a first depth and on which the light source is located and a second recessed portion having a second depth deeper than the first depth and a size adjusted for the light guide plate and on which the light guide plate is located.Type: ApplicationFiled: September 24, 2003Publication date: April 1, 2004Inventors: Katsuaki Yamada, Kenichi Iwamoto, Yoshiki Takata, Kentaroh Aoki, Yuhsuke Ohta
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Publication number: 20030184993Abstract: A liquid crystal display device 1 having a direct-lit backlight 3 disposed immediately below a liquid crystal panel 2 for illuminating the liquid crystal panel 2 has a plurality of tubular light sources 4 disposed at predetermined intervals, a reflector sheet 5 for reflecting the light from the light source 4 to guide it to an illuminated member, a substrate 8 disposed between the light source 4 and the liquid crystal panel 2 and having a lens array 8a, and a diffusive sheet disposed between the substrate 8 and the liquid crystal panel 2 and formed of a diffusive material.Type: ApplicationFiled: March 21, 2003Publication date: October 2, 2003Inventor: Katsuaki Yamada
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Patent number: 5120596Abstract: A coated blade comprising a blade having a surface, and a titanium nitride coating provided on the surface of the blade with a thickness in the range of 0.1 to 0.5 .mu.m. The radius of curvature of a tip portion of the blade is preferably 0.01 to 0.3 .mu.m. A fluororesin coating may be applied on the titanium nitride coating with a thickness not less than 0.1 .mu.m.Type: GrantFiled: August 9, 1991Date of Patent: June 9, 1992Assignee: Kai R&D Center Co., Ltd.Inventor: Katsuaki Yamada