Patents by Inventor Yu-Tai Chang
Yu-Tai Chang 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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Publication number: 20240136420Abstract: A thin film transistor includes a substrate, a semiconductor layer, a gate insulating layer, a gate, a source and a drain. The semiconductor layer is located above the substrate. The gate insulating layer is located above the semiconductor layer. The gate is located above the gate insulating layer and overlapping with the semiconductor layer. The gate includes a first portion, a second portion and a third portion. The first portion is extending along the surface of the gate insulating layer and directly in contact with the gate insulating layer. The second portion is separated from the gate insulating layer. Taking the surface of the gate insulating layer as a reference, the top surface of the second portion is higher than the top surface of the first portion. The third portion connects the first portion to the second portion. The source and the drain are electrically connected to the semiconductor layer.Type: ApplicationFiled: December 1, 2022Publication date: April 25, 2024Applicant: AUO CorporationInventors: Kuo-Jui Chang, Wen-Tai Chen, Chi-Sheng Chiang, Yu-Chuan Liao, Chien-Sen Weng, Ming-Wei Sun
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Patent number: 9319971Abstract: A frequency adjustment method is provided for adjusting a frequency of a reference oscillating signal from an initial oscillation frequency to an adjusted oscillation frequency. The frequency adjustment method includes steps of: dividing a frequency scan section into M scan frequencies; down-converting a signal according to the M scan frequencies to obtain M down-converted signals; performing a correlation calculation operation on the M down-converted signals, respectively, to obtain M correlation results; grouping the M scan frequencies into N frequency groups each containing P selected frequencies, with the P selected frequencies corresponding to P consecutive scan frequencies; performing a group calculation on the N frequency groups, respectively, to obtain N group calculation results; and selecting a target frequency group from the N frequency groups according to the N group calculations results, and obtaining the adjusted oscillation frequency from the target frequency group.Type: GrantFiled: March 6, 2013Date of Patent: April 19, 2016Assignee: MStar Semiconductor, Inc.Inventors: Wei-Jen Chen, Chi-Yuan Peng, Ping-Hung Chiang, Yu-Tai Chang
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Patent number: 9215605Abstract: A method for estimating a frequency difference between a transmission terminal and a reception terminal according to a reception signal is provided. The method includes steps of: in a first period, receiving and storing a first part of the reception signal; in a second period, frequency shifting the first part of the reception signal according to an L number of sweep frequencies, and correspondingly obtaining multiple first part correlation results, where L is a positive integer; in the second period, receiving and storing a second part of the reception signal; in a third period, frequency shifting the second part of the reception signal according to the L number of sweep frequencies, and correspondingly obtaining multiple second part correlation results; and estimating the frequency difference according to the first and second part correlation results.Type: GrantFiled: March 18, 2013Date of Patent: December 15, 2015Assignee: MSTAR SEMICONDUCTOR, INC.Inventors: Chi-Yuan Peng, Chun-Jung Wu, Huan-Hsiu Tseng, Ping-Hung Chiang, Yu-Tai Chang, Francesc Boixadera
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Patent number: 9060334Abstract: A wireless communication device is a mobile station of a wireless communication network system. In an idle mode, when the wireless communication device enters a startup state from a sleep state to prepare for receiving a paging message, base station (BS) measurement is performed at least once before the paging message is received.Type: GrantFiled: July 18, 2011Date of Patent: June 16, 2015Assignee: MStar Semiconductor, Inc.Inventors: Fabien Petitgrand, Yu-Tai Chang, Chao-Yuan Hsu, Li-Ping Yu, Tai-Li Chiang
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Patent number: 8750815Abstract: A communication device including a receiving unit and a decision-making unit is provided. The receiving unit receives a first burst in a paging message provided from a base station. After comparing a signal-to-noise ratio to a threshold, the decision-making unit decides, based on the comparison result, the judging mechanism for judging whether the paging message is a dummy paging message. The signal-to-noise ratio is associated with the channel via which the first burst passed.Type: GrantFiled: April 28, 2011Date of Patent: June 10, 2014Assignee: MStar Semiconductor, Inc.Inventors: Yu-Tai Chang, Chih Yu Chen, Chia Sheng Peng
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Publication number: 20140073315Abstract: A method for estimating a frequency difference between a transmission terminal and a reception terminal according to a reception signal is provided. The method includes steps of: in a first period, receiving and storing a first part of the reception signal; in a second period, frequency shifting the first part of the reception signal according to an L number of sweep frequencies, and correspondingly obtaining multiple first part correlation results, where L is a positive integer; in the second period, receiving and storing a second part of the reception signal; in a third period, frequency shifting the second part of the reception signal according to the L number of sweep frequencies, and correspondingly obtaining multiple second part correlation results; and estimating the frequency difference according to the first and second part correlation results.Type: ApplicationFiled: March 18, 2013Publication date: March 13, 2014Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Chi-Yuan Peng, Chun-Jung Wu, Huan-Hsiu Tseng, Ping-Hung Chiang, Yu-Tai Chang, Francesc Boixadera
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Publication number: 20130237219Abstract: A frequency adjustment method is provided for adjusting a frequency of a reference oscillating signal from an initial oscillation frequency to an adjusted oscillation frequency. The frequency adjustment method includes steps of: dividing a frequency scan section into M scan frequencies; down-converting a signal according to the M scan frequencies to obtain M down-converted signals; performing a correlation calculation operation on the M down-converted signals, respectively, to obtain M correlation results; grouping the M scan frequencies into N frequency groups each containing P selected frequencies, with the P selected frequencies corresponding to P consecutive scan frequencies; performing a group calculation on the N frequency groups, respectively, to obtain N group calculation results; and selecting a target frequency group from the N frequency groups according to the N group calculations results, and obtaining the adjusted oscillation frequency from the target frequency group.Type: ApplicationFiled: March 6, 2013Publication date: September 12, 2013Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Wei-Jen Chen, Chi-Yuan Peng, Ping-Hung Chiang, Yu-Tai Chang
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Patent number: 8531270Abstract: A communication device including a receiving unit and a signal processing module having a simulation unit and a decision unit is provided. The receiving unit receives a first burst of a paging message provided from a base station. Base on a reference burst code and an estimated channel impulse response of the communication channel, the simulation unit generates a simulation burst. The decision unit then determines if the paging message is a dummy message in accordance with the first burst and the simulation burst. The decision unit requests the receiving unit to stop receiving the paging message once the paging message is determined to be a dummy message.Type: GrantFiled: September 17, 2010Date of Patent: September 10, 2013Assignee: Mstar Semiconductor, Inc.Inventors: Yu Tai Chang, Chia Sheng Peng, Shao Ping Hung, Chih Yu Chen
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Patent number: 8223070Abstract: A high accuracy satellite signal receiving controller and associated method is provided. The high accuracy satellite signal receiving controller includes a frequency synthesizer, and an analog-to-digital converter (ADC), a Global Positioning System (GPS) receiving module and a control unit. The frequency synthesizer, coupled to an external non-temperature-compensated crystal oscillator (non-TXCO), generates an oscillating frequency signal to the GPS receiving module. The ADC converts an analog temperature signal into a digital temperature signal. The control unit, coupled to the ADC, adaptively updates temperature/frequency offset data.Type: GrantFiled: February 5, 2009Date of Patent: July 17, 2012Assignee: Mstar Semiconductor, Inc.Inventors: Mikhail Vasilyev, Andrei Bochkovskiy, Hsin-Min Peng, Tsai-Hsin Tsai, Chun-Hsien Wu, Ping-Hsin Kan, Yu Tai Chang, Steve Wiyi Yang
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Publication number: 20120064937Abstract: A wireless communication device is a mobile station of a wireless communication network system. In an idle mode, when the wireless communication device enters a startup state from a sleep state to prepare for receiving a paging message, base station (BS) measurement is performed at least once before the paging message is received.Type: ApplicationFiled: July 18, 2011Publication date: March 15, 2012Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Fabien Petitgrand, Yu-Tai Chang, Chao-Yuan Hsu, Li-Ping Yu, Tai-Li Chiang
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Publication number: 20120021711Abstract: A communication device including a receiving unit and a decision-making unit is provided. The receiving unit receives a first burst in a paging message provided from a base station. After comparing a signal-to-noise ratio to a threshold, the decision-making unit decides, based on the comparison result, the judging mechanism for judging whether the paging message is a dummy paging message. The signal-to-noise ratio is associated with the channel via which the first burst passed.Type: ApplicationFiled: April 28, 2011Publication date: January 26, 2012Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Yu-Tai Chang, Chih Yu Chen, Chia Sheng Peng
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Publication number: 20110311000Abstract: A communication device including a receiving unit and a signal processing module having a simulation unit and a decision unit is provided. The receiving unit receives a first burst of a paging message provided from a base station. Base on a reference burst code and an estimated channel impulse response of the communication channel, the simulation unit generates a simulation burst. The decision unit then determines if the paging message is a dummy message in accordance with the first burst and the simulation burst. The decision unit requests the receiving unit to stop receiving the paging message once the paging message is determined to be a dummy message.Type: ApplicationFiled: September 17, 2010Publication date: December 22, 2011Applicant: MStar Semiconductor, Inc.Inventors: Yu Tai Chang, Chia Sheng Peng, Shao Ping Hung, Chih Yu Chen
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Publication number: 20090262018Abstract: A high accuracy satellite signal receiving controller and associated method is provided. The high accuracy satellite signal receiving controller includes a frequency synthesizer, and an analog-to-digital converter (ADC), a Global Positioning System (GPS) receiving module and a control unit. The frequency synthesizer, coupled to an external non-temperature-compensated crystal oscillator (non-TXCO), generates an oscillating frequency signal to the GPS receiving module. The ADC converts an analog temperature signal into a digital temperature signal. The control unit, coupled to the ADC, adaptively updates temperature/frequency offset data.Type: ApplicationFiled: February 5, 2009Publication date: October 22, 2009Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Mikhail VASILYEV, Andrei BOCHKOVSKIY, Hsin-Min PENG, TSAI-HSIN TSAI, Chun-Hsien WU, Ping-Hsin KAN, Yu Tai CHANG, Steve Wiyi YANG
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Patent number: 7598906Abstract: The present invention provides a global positioning system (GPS) and a method for implementing the system. The GPS includes a control unit, a GPS RF processing circuit and a storage unit. The control unit includes a microprocessor and a mask ROM storing reference information. The GPS RF processing circuit is coupled to the control unit for receiving an RF signal, transforming the RF signal into a base-band or an intermediate frequency signal and transmitting the base-band or the intermediate frequency signal to the control unit. The storage unit is coupled to the control unit to temporally store a program code. The microprocessor executes the program code and refers to the reference information to achieve global positioning.Type: GrantFiled: November 20, 2006Date of Patent: October 6, 2009Assignee: Mstar Semiconductor, Inc.Inventors: Steve Wiyi Yang, Yu-Tai Chang
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Publication number: 20080024362Abstract: The present invention provides a global positioning system (GPS) and a method for implementing the system. The GPS includes a control unit, a GPS RF processing circuit and a storage unit. The control unit includes a microprocessor and a mask ROM storing reference information. The GPS RF processing circuit is coupled to the control unit for receiving an RF signal, transforming the RF signal into a base-band or an intermediate frequency signal and transmitting the base-band or the intermediate frequency signal to the control unit. The storage unit is coupled to the control unit to temporally store a program code. The microprocessor executes the program code and refers to the reference information to achieve global positioning.Type: ApplicationFiled: November 20, 2006Publication date: January 31, 2008Inventors: Steve Wiyi Yang, Yu-Tai Chang