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: 7535022Abstract: An object of the present invention is to provide a technique for improving characteristics of a TFT and realizing the structure of the TFT optimal for driving conditions of a pixel section and a driving circuit, using a smaller number of photo masks. A semiconductor device has a semiconductor film, a first electrode, and a first insulating film sandwiched between the semiconductor film and the first electrode, and further has a second electrode, and a second insulating film sandwiched between the semiconductor film and the second electrode. The first electrode and the second electrode overlap with each other across a channel-formed region which the semiconductor film has. A constant voltage is applied to the first electrode at any time.Type: GrantFiled: December 6, 2006Date of Patent: May 19, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Mai Osada
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Publication number: 20090015524Abstract: An electro-optical device having a plurality of pixels including a plurality of EL elements, wherein the electro-optical device provides a gray scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period; the plurality of the EL elements have a first electrode and a second electrode; the first electrode is held at a constant potential; and a potential of the second electrode changes in such a manner that a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one frame period.Type: ApplicationFiled: July 14, 2008Publication date: January 15, 2009Inventors: Jun Koyama, Kazutaka Inukai, Shunpei Yamazaki, Mai Osada
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Patent number: 7403179Abstract: An electro-optical device having a plurality of pixels including a plurality of EL elements, wherein the electro-optical device provides a gray scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period; the plurality of the EL elements have a first electrode and a second electrode; the first electrode is held at a constant potential; and a potential of the second electrode changes in such a manner that a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one frame period.Type: GrantFiled: February 16, 2005Date of Patent: July 22, 2008Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Jun Koyama, Kazutaka Inukai, Shunpei Yamazaki, Mai Osada
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Publication number: 20070145372Abstract: An object of the present invention is to provide a technique for improving characteristics of a TFT and realizing the structure of the TFT optimal for driving conditions of a pixel section and a driving circuit, using a smaller number of photo masks. A semiconductor device has a semiconductor film, a first electrode, and a first insulating film sandwiched between the semiconductor film and the first electrode, and further has a second electrode, and a second insulating film sandwiched between the semiconductor film and the second electrode. The first electrode and the second electrode overlap with each other across a channel-formed region which the semiconductor film has. A constant voltage is applied to the first electrode at any time.Type: ApplicationFiled: December 6, 2006Publication date: June 28, 2007Inventors: Shunpei Yamazaki, Mai Osada
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Publication number: 20070146333Abstract: The number of operation keys is normally on the order of 12 to 20, corresponding to numeral keys and specialized keys, even for a portable telephone device capable of sending signals to, and receiving signals from, the Internet. In order to input Japanese language characters, including kanji, and specialized characters as data, a complex operation is necessary for switching the input mode. With the present invention, display devices are formed in operation keys for inputting information to electronic devices such as portable information terminals, typically portable telephone devices, and information terminals, typically personal computer or stationary telephone devices. A user is able to recognize the operation keys by characters, symbols, and numerals displayed in the operation keys by the display devices. The user is able to recognize the operation keys even in a dark location in accordance with the present invention.Type: ApplicationFiled: February 28, 2007Publication date: June 28, 2007Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7221338Abstract: 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: April 13, 2001Date of Patent: May 22, 2007Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20070052634Abstract: There is provided an EL light-emitting device with less uneven brightness.Type: ApplicationFiled: October 26, 2006Publication date: March 8, 2007Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 7154119Abstract: An object of the present invention is to provide a technique for improving characteristics of a TFT and realizing the structure of the TFT optimal for driving conditions of a pixel section and a driving circuit, using a smaller number of photo masks. A semiconductor device has a semiconductor film, a first electrode, and a first insulating film sandwiched between the semiconductor film and the first electrode, and further has a second electrode, and a second insulating film sandwiched between the semiconductor film and the second electrode. The first electrode and the second electrode overlap with each other across a channel-formed region which the semiconductor film has. A constant voltage is applied to the first electrode at any time.Type: GrantFiled: May 20, 2005Date of Patent: December 26, 2006Assignee: Semiconductory Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Mai Osada
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Patent number: 7129917Abstract: There is provided an EL light-emitting device with less uneven brightness.Type: GrantFiled: June 23, 2003Date of Patent: October 31, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Publication number: 20060183254Abstract: 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: ApplicationFiled: April 13, 2006Publication date: August 17, 2006Inventors: Shunpei Yamazaki, Yasuyuki Arai, Mai Osada
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Patent number: 7045369Abstract: 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: October 9, 2001Date of Patent: May 16, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Yasuyuki Arai, Mai Osada
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Publication number: 20050247937Abstract: An object of the present invention is to provide a technique for improving characteristics of a TFT and realizing the structure of the TFT optimal for driving conditions of a pixel section and a driving circuit, using a smaller number of photo masks. A semiconductor device has a semiconductor film, a first electrode, and a first insulating film sandwiched between the semiconductor film and the first electrode, and further has a second electrode, and a second insulating film sandwiched between the semiconductor film and the second electrode. The first electrode and the second electrode overlap with each other across a channel-formed region which the semiconductor film has. A constant voltage is applied to the first electrode at any time.Type: ApplicationFiled: May 20, 2005Publication date: November 10, 2005Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Mai Osada
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Publication number: 20050200301Abstract: 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: April 20, 2005Publication date: September 15, 2005Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Patent number: 6933533Abstract: 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: December 20, 2001Date of Patent: August 23, 2005Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Jun Koyama, Mai Osada
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Publication number: 20050162356Abstract: An electro-optical device having a plurality of pixels including a plurality of EL elements, wherein the electro-optical device provides a gray scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period; the plurality of the EL elements have a first electrode and a second electrode; the first electrode is held at a constant potential; and a potential of the second electrode changes in such a manner that a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one frame period.Type: ApplicationFiled: February 16, 2005Publication date: July 28, 2005Inventors: Jun Koyama, Kazutaka Inukai, Shunpei Yamazaki, Mai Osada
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Patent number: 6906344Abstract: An object of the present invention is to provide a technique for improving characteristics of a TFT and realizing the structure of the TFT optimal for driving conditions of a pixel section and a driving circuit, using a smaller number of photo masks. A semiconductor device has a semiconductor film, a first electrode, and a first insulating film sandwiched between the semiconductor film and the first electrode, and further has a second electrode, and a second insulating film sandwiched between the semiconductor film and the second electrode. The first electrode and the second electrode overlap with each other across a channel-formed region which the semiconductor film has. A constant voltage is applied to the first electrode at any time.Type: GrantFiled: May 23, 2002Date of Patent: June 14, 2005Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Mai Osada
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Patent number: 6872973Abstract: An electro-optical device having a plurality of pixels including a plurality of EL elements, wherein the electro-optical device provides a gray scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period; the plurality of the EL elements have a first electrode and a second electrode; the first electrode is held at a constant potential; and a potential of the second electrode changes in such a manner that a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one frame period.Type: GrantFiled: October 19, 2000Date of Patent: March 29, 2005Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Jun Koyama, Kazutaka Inukai, Shunpei Yamazaki, Mai Osada
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Publication number: 20050017963Abstract: 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: August 18, 2004Publication date: January 27, 2005Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20050017964Abstract: 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: August 18, 2004Publication date: January 27, 2005Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Publication number: 20050012731Abstract: 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: August 18, 2004Publication date: January 20, 2005Inventors: Shunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada