Patents by Inventor Hirofumi Katsuse
Hirofumi Katsuse 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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Patent number: 9236001Abstract: A driving method of an electro-optic device is capable of sufficiently providing a threshold voltage compensation time of a driving transistor and a data writing time. A driving method of an electro-optic device including a first power source, a second power source, data lines, scan lines, signal lines, and pixel circuits, includes: a first step in which a light emitting element is in a non-light-emitting state, and a second transistor is turned on by a change of a pulse applied to a signal line; and a second step in which the scan line is sequentially and exclusively selected after the second transistor is turned on, a third transistor including a gate connected to a selected scan line is turned on, and a corresponding data voltage is written to a first node from the data line through the third transistor.Type: GrantFiled: September 10, 2012Date of Patent: January 12, 2016Assignee: Samsung Display Co., Ltd.Inventors: Ryo Ishii, Hirofumi Katsuse, Takeshi Okuno, Naoaki Komiya
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Patent number: 9053667Abstract: The electro-optic device includes a plurality of data lines, a plurality of scan lines, a plurality of pixel areas arranged at crossings of the data lines and the scan lines, and light emitting elements, wherein first pixel areas are in alternating columns, each first pixel area including only one pixel circuit configured to cause the light emitting elements to emit light, wherein second pixel areas are in alternating columns between the first pixel areas, each second pixel area including two pixel circuits configured to cause the light emitting elements to emit light, and wherein a writing process is performed on the second pixel areas to cause light emitting elements on the pixel circuits on one side to emit light in a period for causing light emitting elements on the pixel circuits on the other side to emit light.Type: GrantFiled: October 17, 2012Date of Patent: June 9, 2015Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Hirofumi Katsuse, Takeshi Okuno, Ryo Ishii, Naoaki Komiya
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Patent number: 8957843Abstract: The present invention relates to the circuit size of a gate selection circuit of an active matrix liquid crystal panel. A plurality of clock signals are generated by a clock generation circuit, a shift register is formed by a plurality of latch circuits, and hold information is shifted in synchronization with enable clock signals. In a switch circuit, a plurality of clock signals are sequentially outputted as gate selection signals according to each output signal of the latch circuits. A driving method and a driving apparatus of the gate selection circuit are also disclosed.Type: GrantFiled: February 23, 2011Date of Patent: February 17, 2015Assignee: Samsung Display Co., Ltd.Inventors: Takeshi Okuno, Hirofumi Katsuse, Kazuhiro Matsumoto
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Patent number: 8830145Abstract: A pixel circuit includes: a light emitting element whose cathode is connected to a first power source for supplying a first power supply voltage; a first transistor having a first terminal connected to a data line and having a gate terminal; a second transistor connected between the gate terminal of the first transistor and a second terminal of the first transistor and having a gate terminal; a third transistor connected between the second terminal of the first transistor and an anode of the light emitting element and having a gate terminal; a fourth transistor connected between the gate terminal of the first transistor and an initialization power source and having a gate terminal; and a capacitor having one end connected to a power source for supplying a voltage having a fixed potential and the other end connected to the gate terminal of the first transistor.Type: GrantFiled: September 13, 2012Date of Patent: September 9, 2014Assignee: Samsung Display Co., Ltd.Inventors: Takeshi Okuno, Hirofumi Katsuse, Ryo Ishii, Naoaki Komiya
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Publication number: 20130135275Abstract: A pixel circuit includes: a light emitting element whose cathode is connected to a first power source for supplying a first power supply voltage; a first transistor having a first terminal connected to a data line and having a gate terminal; a second transistor connected between the gate terminal of the first transistor and a second terminal of the first transistor and having a gate terminal; a third transistor connected between the second terminal of the first transistor and an anode of the light emitting element and having a gate terminal; a fourth transistor connected between the gate terminal of the first transistor and an initialization power source and having a gate terminal; and a capacitor having one end connected to a power source for supplying a voltage having a fixed potential and the other end connected to the gate terminal of the first transistor.Type: ApplicationFiled: September 13, 2012Publication date: May 30, 2013Inventors: Takeshi Okuno, Hirofumi Katsuse, Ryo Ishii, Naoaki Komiya
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Publication number: 20130113690Abstract: A driving method of an electro-optic device is capable of sufficiently providing a threshold voltage compensation time of a driving transistor and a data writing time. A driving method of an electro-optic device including a first power source, a second power source, data lines, scan lines, signal lines, and pixel circuits, includes: a first step in which a light emitting element is in a non-light-emitting state, and a second transistor is turned on by a change of a pulse applied to a signal line; and a second step in which the scan line is sequentially and exclusively selected after the second transistor is turned on, a third transistor including a gate connected to a selected scan line is turned on, and a corresponding data voltage is written to a first node from the data line through the third transistor.Type: ApplicationFiled: September 10, 2012Publication date: May 9, 2013Inventors: Ryo Ishii, Hirofumi Katsuse, Takeshi Okuno, Naoaki Komiya
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Publication number: 20130093736Abstract: The electro-optic device includes a plurality of data lines, a plurality of scan lines, a plurality of pixel areas arranged at crossings of the data lines and the scan lines, and light emitting elements, wherein first pixel areas are in alternating columns, each first pixel area including only one pixel circuit configured to cause the light emitting elements to emit light, wherein second pixel areas are in alternating columns between the first pixel areas, each second pixel area including two pixel circuits configured to cause the light emitting elements to emit light, and wherein a writing process is performed on the second pixel areas to cause light emitting elements on the pixel circuits on one side to emit light in a period for causing light emitting elements on the pixel circuits on the other side to emit light.Type: ApplicationFiled: October 17, 2012Publication date: April 18, 2013Inventors: Hirofumi KATSUSE, Takeshi OKUNO, Ryo ISHII, Naoaki KOMIYA
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Publication number: 20110205196Abstract: The present invention relates to the circuit size of a gate selection circuit of an active matrix liquid crystal panel. A plurality of clock signals are generated by a clock generation circuit, a shift register is formed by a plurality of latch circuits, and hold information is shifted in synchronization with enable clock signals. In a switch circuit, a plurality of clock signals are sequentially outputted as gate selection signals according to each output signal of the latch circuits. A driving method and a driving apparatus of the gate selection circuit are also disclosed.Type: ApplicationFiled: February 23, 2011Publication date: August 25, 2011Applicant: SAMSUNG MOBILE DISPLAY CO., LTD.Inventors: Takeshi Okuno, Hirofumi Katsuse, Kazuhiro Matsumoto
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Patent number: 7978295Abstract: A vertically aligned system liquid crystal display in which deterioration in display quality such as graininess, burn-in, afterimages due to disorder in orientation of liquid crystal molecules based on a connection electrodes for interconnecting sub-pixel electrodes can be prevented, and a method for manufacturing such liquid crystal display. In the liquid crystal display, each pixel electrode (2) of a liquid crystal panel is constituted by combining at least two sub-pixel electrodes (2a), and each sub-pixel electrode (2a) is connected through a bridge (3) narrower than the sub-pixel electrode (2a). A vertically aligned system in which liquid crystal molecules tilt symmetrically to the central axis of orientation in the direction perpendicular to the surface of each sub-pixel electrode (2a) upon application of a voltage is employed. The bridge (3) is provided at a position asymmetric to the sub-pixel electrode (2a).Type: GrantFiled: June 21, 2006Date of Patent: July 12, 2011Assignee: Sharp Kabushiki KaishaInventors: Yasutoshi Tasaka, Mutsumi Nakajima, Masayuki Inoue, Keisuke Yoshida, Hirofumi Katsuse
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Patent number: 7839473Abstract: In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix (6) is made larger above the region between adjacent ITO transparent electrodes (3) and is made smaller above the region between adjacent Al reflective electrodes (4). This enables a transmissive portion to offer a display with high contrast that does not suffer from afterimage or the like by shielding light from the domain lying between the adjacent pixels, and the reflective portion to offer a brighter display by increasing the aperture ratio thereof by making the black matrix width as small as possible or forming no black matrix.Type: GrantFiled: April 12, 2010Date of Patent: November 23, 2010Assignee: Sharp Kabushiki KaishaInventors: Keisuke Yoshida, Ichiro Shiraki, Shingo Jogan, Hirofumi Katsuse
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Publication number: 20100195031Abstract: In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix (6) is made larger above the region between adjacent ITO transparent electrodes (3) and is made smaller above the region between adjacent Al reflective electrodes (4). This enables a transmissive portion to offer a display with high contrast that does not suffer from afterimage or the like by shielding light from the domain lying between the adjacent pixels, and the reflective portion to offer a brighter display by increasing the aperture ratio thereof by making the black matrix width as small as possible or forming no black matrix.Type: ApplicationFiled: April 12, 2010Publication date: August 5, 2010Applicant: Sharp Kabushiki KaishaInventors: Keisuke Yoshida, Ichiro Shiraki, Shingo Jogan, Hirofumi Katsuse
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Patent number: 7719640Abstract: In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix (6) is made larger above the region between adjacent ITO transparent electrodes (3) and is made smaller above the region between adjacent Al reflective electrodes (4). This enables a transmissive portion to offer a display with high contrast that does not suffer from afterimage or the like by shielding light from the domain lying between the adjacent pixels, and the reflective portion to offer a brighter display by increasing the aperture ratio thereof by making the black matrix width as small as possible or forming no black matrix.Type: GrantFiled: March 30, 2009Date of Patent: May 18, 2010Assignee: Sharp Kabushiki KaishaInventors: Keisuke Yoshida, Ichiro Shiraki, Shingo Jogan, Hirofumi Katsuse
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Publication number: 20090219476Abstract: A vertically aligned system liquid crystal display in which deterioration in display quality such as graininess, burn-in, afterimages due to disorder in orientation of liquid crystal molecules based on a connection electrodes for interconnecting sub-pixel electrodes can be prevented, and a method for manufacturing such liquid crystal display. In the liquid crystal display, each pixel electrode (2) of a liquid crystal panel is constituted by combining at least two sub-pixel electrodes (2a), and each sub-pixel electrode (2a) is connected through a bridge (3) narrower than the sub-pixel electrode (2a). A vertically aligned system in which liquid crystal molecules tilt symmetrically to the central axis of orientation in the direction perpendicular to the surface of each sub-pixel electrode (2a) upon application of a voltage is employed. The bridge (3) is provided at a position asymmetric to the sub-pixel electrode (2a).Type: ApplicationFiled: June 21, 2006Publication date: September 3, 2009Inventors: Yasutoshi Tasaka, Mutsumi Nakajima, Masayuki Inoue, Keisuke Yoshida, Hirofumi Katsuse
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Publication number: 20090190076Abstract: In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix (6) is made larger above the region between adjacent ITO transparent electrodes (3) and is made smaller above the region between adjacent Al reflective electrodes (4). This enables a transmissive portion to offer a display with high contrast that does not suffer from afterimage or the like by shielding light from the domain lying between the adjacent pixels, and the reflective portion to offer a brighter display by increasing the aperture ratio thereof by making the black matrix width as small as possible or forming no black matrix.Type: ApplicationFiled: March 30, 2009Publication date: July 30, 2009Applicant: Sharp Kabushiki KaishaInventors: Keisuke Yoshida, Ichiro Shiraki, Shingo Jogan, Hirofumi Katsuse
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Patent number: 7532280Abstract: In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix (6) is made larger above the region between adjacent ITO transparent electrodes (3) and is made smaller above the region between adjacent Al reflective electrodes (4). This enables a transmissive portion to offer a display with high contrast that does not suffer from afterimage or the like by shielding light from the domain lying between the adjacent pixels, and the reflective portion to offer a brighter display by increasing the aperture ratio thereof by making the black matrix width as small as possible or forming no black matrix.Type: GrantFiled: July 13, 2005Date of Patent: May 12, 2009Assignee: Sharp Kabushiki KaishaInventors: Keisuke Yoshida, Ichiro Shiraki, Shingo Jogan, Hirofumi Katsuse
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Patent number: 7436477Abstract: An active substrate is provided, which comprises a switching element comprising a first drive region and a second drive region, a signal line being connected to the first drive region, a pixel electrode connected to the second drive region, a first layer comprising at least one of a semiconductor material and a conductive material, and connected to the pixel electrode, a second layer comprising at least one of a semiconductor material and a conductive material, and connected to the signal line; and an insulating film provided between the first layer and the second layer. At least a portion of the first layer and at least a portion of the second layer overlap each other so that the first layer and the second layer are short-circuited by applying first energy to the insulating film.Type: GrantFiled: September 17, 2004Date of Patent: October 14, 2008Assignee: Sharp Kabushiki KaishaInventors: Mutsumi Nakajima, Ichirou Shiraki, Osamu Sasaki, Hironobu Tatsumi, Hirofumi Katsuse, Masayuki Inoue, Hideo Kasugai, Keisuke Yoshida
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Patent number: 7330222Abstract: A display device includes a source line for supplying a display signal, a display pixel electrode, and a TFT for switching an electrical connection between the source line and the pixel electrode. The TFT includes a source electrode electrically connected to the source line, a drain electrode electrically connected to the pixel electrode, and a gate electrode for controlling an electrical connection between the source electrode and the drain electrode. A first auxiliary capacitor electrode and a second auxiliary capacitor electrode are connected to the drain electrode and respective connection portions between the drain electrode and the auxiliary capacitor electrodes are formed of a semiconductor material.Type: GrantFiled: February 3, 2005Date of Patent: February 12, 2008Assignee: Sharp Kabushiki KaishaInventors: Ichiro Shiraki, Mutsumi Nakajima, Keisuke Yoshida, Shoichi Andou, Masayuki Inoue, Hirofumi Katsuse, Junichi Yamada
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Publication number: 20070242196Abstract: In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix (6) is made larger above the region between adjacent ITO transparent electrodes (3) and is made smaller above the region between adjacent Al reflective electrodes (4). This enables a transmissive portion to offer a display with high contrast that does not suffer from afterimage or the like by shielding light from the domain lying between the adjacent pixels, and the reflective portion to offer a brighter display by increasing the aperture ratio thereof by making the black matrix width as small as possible or forming no black matrix.Type: ApplicationFiled: July 13, 2005Publication date: October 18, 2007Inventors: Keisuke Yoshida, Ichiro Shiraki, Shingo Jogan, Hirofumi Katsuse
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Patent number: 7242442Abstract: In an active matrix substrate for allowing a point defect of a defect pixel portion, among a plurality of pixel portions arranged two-dimensionally, to be repaired by radiation of energy, the active matrix substrate includes one of a first protection member for absorbing excessive energy power and preventing pieces of a conductive material from being scattered; and a second protection member for preventing pieces of a conductive material from being scattered and for preventing a conductive layer from bulging. One of the first protection member and the second protection member is provided above at least one energy radiation portion.Type: GrantFiled: September 10, 2004Date of Patent: July 10, 2007Assignee: Sharp Kabushiki KaishaInventors: Mutsumi Nakajima, Ichirou Shiraki, Hideo Kasugai, Hironobu Tatsumi, Hirofumi Katsuse, Osamu Sasaki, Masayuki Inoue
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Publication number: 20050174500Abstract: A display device includes a source line for supplying a display signal, a display pixel electrode, and a TFT for switching an electrical connection between the source line and the pixel electrode. The TFT includes a source electrode electrically connected to the source line, a drain electrode electrically connected to the pixel electrode, and a gate electrode for controlling an electrical connection between the source electrode and the drain electrode. A first auxiliary capacitor electrode and a second auxiliary capacitor electrode are connected to the drain electrode and respective connection portions between the drain electrode and the auxiliary capacitor electrodes are formed of a semiconductor material.Type: ApplicationFiled: February 3, 2005Publication date: August 11, 2005Inventors: Ichiro Shiraki, Mutsumi Nakajima, Keisuke Yoshida, Shoichi Andou, Masayuki Inoue, Hirofumi Katsuse, Junichi Yamada