Patents by Inventor Aya Anazai
Aya Anazai 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: 8018403Abstract: A display device with high-definition, in which display unevenness due to a voltage drop in a wiring or display unevenness due to a variation in characteristics of TFTs are suppressed. The display device of the invention comprises a first wiring for transmitting a video signal and a second wiring for supplying a current to a light emitting element. The first wiring and the second wiring extend parallel to each other, and are formed so as to overlap with each other at least partly with an insulating layer interposed therebetween.Type: GrantFiled: July 6, 2007Date of Patent: September 13, 2011Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Masayuki Sakakura, Ritsuko Nagao, Mitsuaki Osame, Aya Anazai, Yu Yamazaki, Yoshifumi Tanada
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Patent number: 7423295Abstract: The invention provides a light emitting device using transistors manufactured by the conventional process while reducing an area occupied by capacitors, whereby variations in luminance of light emitting elements caused by variations in gate voltage Vgs of the transistors are suppressed, and a luminance decay of the light emitting elements due to the degradation of light emitting materials and variations in luminance can also be suppressed.Type: GrantFiled: February 15, 2007Date of Patent: September 9, 2008Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Yu Yamazaki, Aya Anazai, Ryota Fukumoto, Mitsuaki Osame
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Publication number: 20070241992Abstract: No need of lowering off-current of a switching transistor, fewer luminance variations of a light emitting element between pixels due to characteristic variations of a driving transistor, and less risk of steps due to increase in the number of wirings. A video signal for light emission or non-emission of a pixel is input to a gate of a current controlling transistor operated in a linear region, which is connected in series with the driving transistor, through a switching transistor. Since a voltage Vds between a source and a drain of the current controlling transistor is small, small changes in a voltage Vgs between a gate and a source thereof do not affect a current flowing in a load. The current flowing in the light emitting element is determined by the driving transistor operated in a saturation region, and a fixed potential is input to the gate thereof during light emission.Type: ApplicationFiled: October 16, 2006Publication date: October 18, 2007Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Ryota Fukumoto, Aya Anazai, Yu Yamazaki, Mitsuaki Osame
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Publication number: 20070188422Abstract: The invention provides a portable information terminal, such as a notebook PC, including light-emitting elements entirely having longer lives (a double-sided display panel having longer lives) and allowing lower power consumption with a double-sided display panel having a first screen on one surface of a substrate in the portable information terminal, such as a notebook PC, and a second screen on the other surface of the substrate on the opposite side of the first screen. In this case, light emission intensities and aperture ratios of the first and second screens may be differentiated for different applications of the first and second screens. One of the first screen and second screen may implement multi-color display, and the other may implement monochrome display. The double-sided display panel may be used in a lid of a portable information terminal, such as a notebook PC, and a touch-panel function may be provided thereto.Type: ApplicationFiled: April 12, 2007Publication date: August 16, 2007Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Aya Anazai, Mitsuaki Osame, Shunpei Yamazaki
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Publication number: 20070138479Abstract: The invention provides a light emitting device using transistors manufactured by the conventional process while reducing an area occupied by capacitors, whereby variations in luminance of light emitting elements caused by variations in gate voltage Vgs of the transistors are suppressed, and a luminance decay of the light emitting elements due to the degradation of light emitting materials and variations in luminance can also be suppressed.Type: ApplicationFiled: February 15, 2007Publication date: June 21, 2007Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Yu Yamazaki, Aya Anazai, Ryota Fukumoto, Mitsuaki Osame
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Patent number: 7180245Abstract: The invention provides a light emitting device using transistors manufactured by the conventional process while reducing an area occupied by capacitors, whereby variations in luminance of light emitting elements caused by variations in gate voltage Vgs of the transistors are suppressed, and a luminance decay of the light emitting elements due to the degradation of light emitting materials and variations in luminance can also be suppressed.Type: GrantFiled: June 4, 2004Date of Patent: February 20, 2007Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Yu Yamazaki, Aya Anazai, Ryota Fukumoto, Mitsuaki Osame
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Patent number: 7122969Abstract: No need of lowering off-current of a switching transistor, fewer luminance variations of a light emitting element between pixels due to characteristic variations of a driving transistor, and less risk of steps due to increase in the number of wirings. A video signal for light emission or non-emission of a pixel is input to a gate of a current controlling transistor operated in a linear region, which is connected in series with the driving transistor, through a switching transistor. Since a voltage Vds between a source and a drain of the current controlling transistor is small, small changes in a voltage Vgs between a gate and a source thereof do not affect a current flowing in a load. The current flowing in the light emitting element is determined by the driving transistor operated in a saturation region, and a fixed potential is input to the gate thereof during light emission.Type: GrantFiled: June 14, 2004Date of Patent: October 17, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Ryota Fukumoto, Aya Anazai, Yu Yamazaki, Mitsuaki Osame
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Publication number: 20040256997Abstract: No need of lowering off-current of a switching transistor, fewer luminance variations of a light emitting element between pixels due to characteristic variations of a driving transistor, and less risk of steps due to increase in the number of wirings. A video signal for light emission or non-emission of a pixel is input to a gate of a current controlling transistor operated in a linear region, which is connected in series with the driving transistor, through a switching transistor. Since a voltage Vds between a source and a drain of the current controlling transistor is small, small changes in a voltage Vgs between a gate and a source thereof do not affect a current flowing in a load. The current flowing in the light emitting element is determined by the driving transistor operated in a saturation region, and a fixed potential is input to the gate thereof during light emission.Type: ApplicationFiled: June 14, 2004Publication date: December 23, 2004Inventors: Ryota Fukumoto, Aya Anazai, Yu Yamazaki, Mitsuaki Osame
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Publication number: 20040251465Abstract: The invention provides a light emitting device using transistors manufactured by the conventional process while reducing an area occupied by capacitors, whereby variations in luminance of light emitting elements caused by variations in gate voltage Vgs of the transistors are suppressed, and a luminance decay of the light emitting elements due to the degradation of light emitting materials and variations in luminance can also be suppressed.Type: ApplicationFiled: June 4, 2004Publication date: December 16, 2004Inventors: Yu Yamazaki, Aya Anazai, Ryota Fukumoto, Mitsuaki Osame