Patents by Inventor Mizuki Sato
Mizuki Sato 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: 7863612Abstract: An object is to provide a display device with a high aperture ratio or a semiconductor device in which the area of an element is large. A channel formation region of a TFT with a multi-gate structure is provided under a wiring that is provided between adjacent pixel electrodes (or electrodes of an element). In addition, a channel width direction of each of a plurality of channel formation regions is parallel to a longitudinal direction of the pixel electrode. In addition, when a channel width is longer than a channel length, the area of the channel formation region can be increased.Type: GrantFiled: July 3, 2007Date of Patent: January 4, 2011Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Mizuki Sato
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Patent number: 7710379Abstract: A display device and a driving method thereof are provided, which reduces an instantaneous current generated with a charge and discharge of source signal lines and further reduces a load to a power supply line. According to the invention, source signal lines are divided into the first to the n-th groups so as to be charged or discharged according to the first to the n-th latch pulses which are inputted at different timing. Since the number of the source signal lines which start to be charged or discharged at the same time is reduced, an instantaneous current generated with the charge and discharge can be reduced, and a load to the power supply line can be reduced as well.Type: GrantFiled: August 30, 2004Date of Patent: May 4, 2010Assignee: Semiconductor Energy Laboratory Co., LtdInventors: Tomoyuki Iwabuchi, Yasunori Yoshida, Akihiro Kimura, Mizuki Sato
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Patent number: 7688107Abstract: The present invention provides a shift register which can operate favorably without providing a level shift portion.Type: GrantFiled: March 24, 2006Date of Patent: March 30, 2010Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Mitsuaki Osame, Aya Anzai, Mizuki Sato
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Patent number: 7635863Abstract: A light-emitting element has a property that a resistance value (internal resistance) changes in accordance with an environmental temperature. It is an object to downsize a monitoring element which corrects an influence of variations in current value of the light-emitting element, which are caused by an environmental temperature change and a change with time. A pixel includes a plurality of sub-pixels, areas of light-emitting elements provided in the individual sub-pixels are made to be different from each other, and an area of a monitoring element is made to be the same as an area of the light-emitting element in any of the sub-pixels, thereby correcting light-emission of the pixel by the monitoring element.Type: GrantFiled: October 10, 2006Date of Patent: December 22, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Mitsuaki Osame, Tomoyuki Iwabuchi, Kei Takahashi, Ryo Nozawa, Mizuki Sato, Ryota Fukumoto
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Publication number: 20090224261Abstract: A display device in which light leakage in a monitor element portion is prevented without increasing the number of steps and cost is provided. The display device includes a monitor element for suppressing influence on a light-emitting element due to temperature change and change over time and a TFT for driving the monitor element, in which the TFT for driving the monitor element is provided so as not to overlap the monitor element. Furthermore, the display device includes a first light shielding film and a second light shielding film, in which the first light shielding film is provided so as to overlap a first electrode of the monitor element and the second light shielding film is electrically connect to the first light shielding film through a contact hole formed in an interlayer insulating film. The contact hole is formed so as to surround the outer edge of the first electrode of the monitor element.Type: ApplicationFiled: May 15, 2009Publication date: September 10, 2009Inventors: Yasuyuki Takahashi, Mizuki Sato
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Patent number: 7534985Abstract: A display device in which light leakage in a monitor element portion is prevented without increasing the number of steps and cost is provided. The display device includes a monitor element for suppressing influence on a light-emitting element due to temperature change and change over time and a TFT for driving the monitor element, in which the TFT for driving the monitor element is provided so as not to overlap the monitor element. Furthermore, the display device includes a first light shielding film and a second light shielding film, in which the first light shielding film is provided so as to overlap a first electrode of the monitor element and the second light shielding film is electrically connect to the first light shielding film through a contact hole formed in an interlayer insulating film. The contact hole is formed so as to surround the outer edge of the first electrode of the monitor element.Type: GrantFiled: January 9, 2007Date of Patent: May 19, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Yasuyuki Takahashi, Mizuki Sato
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Publication number: 20080231561Abstract: A display device in which a light shielding film is formed so as not to increase the number of steps and its cost, is provided. The display device of the present invention includes a monitor element for controlling influence on a light-emitting element due to temperature change and change with time and a TFT for driving the monitor element, and the TFT for driving the monitor element is provided so as not to be overlapped with the monitor element. The display device of the present invention includes a first light shielding film provided so as not to be overlapped with a first electrode of the monitor element, and a second light shielding film provided so as to be overlapped with an outer edge portion of the first electrode.Type: ApplicationFiled: April 24, 2008Publication date: September 25, 2008Inventor: Mizuki Sato
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Patent number: 7365494Abstract: A display device in which a light shielding film is formed so as not to increase the number of steps and its cost, is provided. The display device of the present invention includes a monitor element for controlling influence on a light-emitting element due to temperature change and change with time and a TFT for driving the monitor element, and the TFT for driving the monitor element is provided so as not to be overlapped with the monitor element. The display device of the present invention includes a first light shielding film provided so as not to be overlapped with a first electrode of the monitor element, and a second light shielding film provided so as to be overlapped with an outer edge portion of the first electrode.Type: GrantFiled: November 22, 2005Date of Patent: April 29, 2008Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Mizuki Sato
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Publication number: 20080017866Abstract: An object is to provide a display device with a high aperture ratio or a semiconductor device in which the area of an element is large. A channel formation region of a TFT with a multi-gate structure is provided under a wiring that is provided between adjacent pixel electrodes (or electrodes of an element). In addition, a channel width direction of each of a plurality of channel formation regions is parallel to a longitudinal direction of the pixel electrode. In addition, when a channel width is longer than a channel length, the area of the channel formation region can be increased.Type: ApplicationFiled: July 3, 2007Publication date: January 24, 2008Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventor: Mizuki SATO
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Publication number: 20070194314Abstract: A light-emitting element has a property that a resistance value (internal resistance) changes in accordance with an environmental temperature. It is an object to downsize a monitoring element which corrects an influence of variations in current value of the light-emitting element, which are caused by an environmental temperature change and a change with time. A pixel includes a plurality of sub-pixels, areas of light-emitting elements provided in the individual sub-pixels are made to be different from each other, and an area of a monitoring element is made to be the same as an area of the light-emitting element in any of the sub-pixels, thereby correcting light-emission of the pixel by the monitoring element.Type: ApplicationFiled: October 10, 2006Publication date: August 23, 2007Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei YAMAZAKI, Mitsuaki OSAME, Tomoyuki IWABUCHI, Kei TAKAHASHI, Ryo NOZAWA, Mizuki SATO, Ryota FUKUMOTO
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Publication number: 20070159099Abstract: A display device in which light leakage in a monitor element portion is prevented without increasing the number of steps and cost is provided. The display device includes a monitor element for suppressing influence on a light-emitting element due to temperature change and change over time and a TFT for driving the monitor element, in which the TFT for driving the monitor element is provided so as not to overlap the monitor element. Furthermore, the display device includes a first light shielding film and a second light shielding film, in which the first light shielding film is provided so as to overlap a first electrode of the monitor element and the second light shielding film is electrically connect to the first light shielding film through a contact hole formed in an interlayer insulating film. The contact hole is formed so as to surround the outer edge of the first electrode of the monitor element.Type: ApplicationFiled: January 9, 2007Publication date: July 12, 2007Inventors: Yasuyuki Takahashi, Mizuki Sato
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Publication number: 20070091035Abstract: When a time grayscale method is used, it is an object to provide a display device in which the number of signal writings into a pixel can be reduced by dividing one frame period by the number of bits and power consumption can be reduced, and grayscale can be expressed. Further a smaller electronic device that performs display by a time grayscale method can be obtained. Grayscale can be expressed by dividing one frame period into subframe periods without storing signals by grayscale expression by a time grayscale method. Thus, power consumption can be reduced and downsizing of an electronic device can be achieved.Type: ApplicationFiled: October 16, 2006Publication date: April 26, 2007Inventors: Mitsuaki Osame, Mizuki Sato
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Publication number: 20060233293Abstract: The present invention provides a shift register which can operate favorably without providing a level shift portion.Type: ApplicationFiled: March 24, 2006Publication date: October 19, 2006Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Mitsuaki Osame, Aya Anzai, Mizuki Sato
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Publication number: 20060181221Abstract: A display device in which a light shielding film is formed so as not to increase the number of steps and its cost, is provided. The display device of the present invention includes a monitor element for controlling influence on a light-emitting element due to temperature change and change with time and a TFT for driving the monitor element, and the TFT for driving the monitor element is provided so as not to be overlapped with the monitor element. The display device of the present invention includes a first light shielding film provided so as not to be overlapped with a first electrode of the monitor element, and a second light shielding film provided so as to be overlapped with an outer edge portion of the first electrode.Type: ApplicationFiled: November 22, 2005Publication date: August 17, 2006Inventor: Mizuki Sato
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Publication number: 20050057547Abstract: A display device and a driving method thereof are provided, which reduces an instantaneous current generated with a charge and discharge of source signal lines and further reduces a load to a power supply line. According to the invention, source signal lines are divided into the first to the n-th groups so as to be charged or discharged according to the first to the n-th latch pulses which are inputted at different timing. Since the number of the source signal lines which start to be charged or discharged at the same time is reduced, an instantaneous current generated with the charge and discharge can be reduced, and a load to the power supply line can be reduced as well.Type: ApplicationFiled: August 30, 2004Publication date: March 17, 2005Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tomoyuki Iwabuchi, Yasunori Yoshida, Akihiro Kimura, Mizuki Sato