Patents by Inventor Mai Osada
Mai Osada 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: 8674909Abstract: There is provided an EL light-emitting device with less uneven brightness. When a drain current of a plurality of current controlling TFTs is Id, a mobility is ?, a gate capacitance per unit area is Co, a maximum gate voltage is Vgs(max), a channel width is W, a channel length is L, an average value of a threshold voltage is Vth, a deviation from the average value of the threshold voltage is ?Vth, and a difference in emission brightness of a plurality of EL elements is within a range of ±n %, a semiconductor display device is characterized in that A = 2 ? Id ? * C 0 A ( Vgs ( ma ? ? x ) - Vth ) 2 ? W L ? ( 1 + n 100 - 1 ) 2 * A ? ? ? Vth 2 ? ? ? ? Vth ? ? ( 1 + n 100 - 1 ) * A * L / W .Type: GrantFiled: July 19, 2013Date of Patent: March 18, 2014Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 8638278Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: March 11, 2013Date of Patent: January 28, 2014Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20130299802Abstract: There is provided an EL light-emitting device with less uneven brightness.Type: ApplicationFiled: July 19, 2013Publication date: November 14, 2013Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 8493295Abstract: There is provided an EL light-emitting device with less uneven brightness. When a drain current of a plurality of current controlling TFTs is Id, a mobility is ?, a gate capacitance per unit area is Co, a maximum gate voltage is Vgs(max), a channel width is W a channel length is L, an average value of a threshold voltage is Vth, a deviation from the average value of the threshold voltage is ?Vth, and a difference in emission brightness of a plurality of EL elements is within a range of ±n %, a semiconductor display device is characterized in that A = 2 ? Id ? * C 0 A ( Vgs ( max ) - Vth ) 2 ? W L ? ( 1 + n 100 - 1 ) 2 * A ? ? ? Vth 2 ? ? ? ? Vth ? ? ( 1 + n 100 - 1 ) * A * L / W .Type: GrantFiled: January 20, 2011Date of Patent: July 23, 2013Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 8400379Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: May 25, 2012Date of Patent: March 19, 2013Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20120235155Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: ApplicationFiled: May 25, 2012Publication date: September 20, 2012Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Patent number: 8194008Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: February 18, 2011Date of Patent: June 5, 2012Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20110315993Abstract: There is provided a light emitting device in which low power consumption can be realized even in the case of a large screen. The surface of a source signal line or a power supply line in a pixel portion is plated to reduce a resistance of a wiring. The source signal line in the pixel portion is manufactured by a step different from a source signal line in a driver circuit portion. The power supply line in the pixel portion is manufactured by a step different from a power supply line led on a substrate. A terminal is similarly plated to made the resistance reduction. It is desirable that a wiring before plating is made of the same material as a gate electrode and the surface of the wiring is plated to form the source signal line or the power supply line.Type: ApplicationFiled: September 2, 2011Publication date: December 29, 2011Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 8013346Abstract: There is provided a light emitting device in which low power consumption can be realized even in the case of a large screen. The surface of a source signal line or a power supply line in a pixel portion is plated to reduce a resistance of a wiring. The source signal line in the pixel portion is manufactured by a step different from a source signal line in a driver circuit portion. The power supply line in the pixel portion is manufactured by a step different from a power supply line led on a substrate. A terminal is similarly plated to made the resistance reduction. It is desirable that a wiring before plating is made of the same material as a gate electrode and the surface of the wiring is plated to form the source signal line or the power supply line.Type: GrantFiled: September 8, 2009Date of Patent: September 6, 2011Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7995010Abstract: There is provided an EL light-emitting device with less uneven brightness.Type: GrantFiled: October 26, 2006Date of Patent: August 9, 2011Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7990348Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: October 30, 2009Date of Patent: August 2, 2011Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20110140997Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: ApplicationFiled: February 18, 2011Publication date: June 16, 2011Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20110109604Abstract: There is provided an EL light-emitting device with less uneven brightness.Type: ApplicationFiled: January 20, 2011Publication date: May 12, 2011Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7727779Abstract: A method of repairing a light emitting device which makes high quality image display possible even if a pin hole is formed during formation of an EL layer is provided. The method of repairing a light emitting device is characterized in that a reverse bias voltage is applied to an EL element at given time intervals to thereby reduce a current flowing into an EL element when the reverse bias voltage is applied to the EL element.Type: GrantFiled: April 13, 2006Date of Patent: June 1, 2010Assignee: Semiconductor Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Yasuyuki Arai, Mai Osada
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Publication number: 20100045578Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: ApplicationFiled: October 30, 2009Publication date: February 25, 2010Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20090321753Abstract: There is provided a light emitting device in which low power consumption can be realized even in the case of a large screen. The surface of a source signal line or a power supply line in a pixel portion is plated to reduce a resistance of a wiring. The source signal line in the pixel portion is manufactured by a step different from a source signal line in a driver circuit portion. The power supply line in the pixel portion is manufactured by a step different from a power supply line led on a substrate. A terminal is similarly plated to made the resistance reduction. It is desirable that a wiring before plating is made of the same material as a gate electrode and the surface of the wiring is plated to form the source signal line or the power supply line.Type: ApplicationFiled: September 8, 2009Publication date: December 31, 2009Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7629618Abstract: There is provided a light emitting device in which low power consumption can be realized even in the case of a large screen. The surface of a source signal line or a power supply line in a pixel portion is plated to reduce a resistance of a wiring. The source signal line in the pixel portion is manufactured by a step different from a source signal line in a driver circuit portion. The power supply line in the pixel portion is manufactured by a step different from a power supply line led on a substrate. A terminal is similarly plated to made the resistance reduction. It is desirable that a wiring before plating is made of the same material as a gate electrode and the surface of the wiring is plated to form the source signal line or the power supply line.Type: GrantFiled: April 20, 2005Date of Patent: December 8, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7623098Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: August 18, 2004Date of Patent: November 24, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Patent number: 7623100Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: August 18, 2004Date of Patent: November 24, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Patent number: 7623099Abstract: The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.Type: GrantFiled: August 18, 2004Date of Patent: November 24, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada