Patents by Inventor Chih-Jen Yen
Chih-Jen Yen 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: 9196209Abstract: A charge recycling circuit is configured to recycle charges which are discharged by a driving circuit during a discharge period and provide the recycled charges for charging the driving circuit during a charge period. Power consumption in the driving circuit may thus be reduced.Type: GrantFiled: January 8, 2012Date of Patent: November 24, 2015Assignee: NOVATEK Microelectronics Corp.Inventor: Chih-Jen Yen
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Publication number: 20150117070Abstract: An AC-DC converting apparatus and operating method are provided. The AC-DC converting apparatus includes a transformer, a first energy storage unit, a first output switch, a second energy storage unit, a second output switch and a secondary-side control module. The transformer includes a primary-side winding and a secondary-side winding. The first output switch is coupled between the secondary-side winding and the first energy storage unit. The second output switch is coupled between the secondary-side winding and the second energy storage unit. The secondary-side control module monitors the first energy storage unit and the second energy storage unit, and decides time length of a conduction period of the first output switch and the second output switch according to the monitoring result.Type: ApplicationFiled: February 19, 2014Publication date: April 30, 2015Applicant: Novatek Microelectronics Corp.Inventors: Ying-Hsiang Wang, Che-Li Lin, Chih-Jen Yen
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Patent number: 9013392Abstract: A gamma-voltage generator is provided to generating a plurality of first gamma voltages and second gamma voltages. At least one of the first gamma voltages generated by DACs of the gamma-voltage generator within a first frame period and at least one of the second gamma voltages generated by the DACs within a second frame period are outputted from a same one of the gamma buffers of the gamma-voltage generator, whereby the transmitted gamma voltages have substantially equal offset. Therefore, the display quality approaches an ideal condition.Type: GrantFiled: October 21, 2013Date of Patent: April 21, 2015Assignee: Novatek Microelectronics Corp.Inventors: Chih-Jen Yen, Yueh-Hsiu Liu, Ju-Lin Huang, Peng-Yu Chen, Yu-Shao Liu
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Patent number: 8907939Abstract: A frame maintaining circuit including a detection circuit and a display control circuit is provided. The detection circuit detects an unusual status to output a status feedback signal. The display control circuit maintains a frame displayed by a display apparatus according to the status feedback signal until the unusual status ceases.Type: GrantFiled: June 8, 2012Date of Patent: December 9, 2014Assignee: Novatek Microelectronics Corp.Inventors: Yueh-Hsiu Liu, Hsin-Yih Li, Chih-Yung Hsu, Yu-Shao Liu, Chih-Jen Yen
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Publication number: 20140043313Abstract: A gamma-voltage generator is provided to generating a plurality of first gamma voltages and second gamma voltages. At least one of the first gamma voltages generated by DACs of the gamma-voltage generator within a first frame period and at least one of the second gamma voltages generated by the DACs within a second frame period are outputted from a same one of the gamma buffers of the gamma-voltage generator, whereby the transmitted gamma voltages have substantially equal offset. Therefore, the display quality approaches an ideal condition.Type: ApplicationFiled: October 21, 2013Publication date: February 13, 2014Applicant: Novatek Microelectronics Corp.Inventors: Chih-Jen Yen, Yueh-Hsiu Liu, Ju-Lin Huang, Peng-Yu Chen, Yu-Shao Liu
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Patent number: 8593389Abstract: A gamma-voltage generator is provided to generating a plurality of first gamma voltages and second gamma voltages. At least one of the first gamma voltages generated by DACs of the gamma-voltage generator within a first frame period and at least one of the second gamma voltages generated by the DACs within a second frame period are outputted from a same one of the gamma buffers of the gamma-voltage generator, whereby the transmitted gamma voltages have substantially equal offset. Therefore, the display quality approaches an ideal condition.Type: GrantFiled: April 10, 2012Date of Patent: November 26, 2013Assignee: Novatek Microelectronics Corp.Inventors: Chih-Jen Yen, Yueh-Hsiu Liu, Ju-Lin Huang, Peng-Yu Chen, Yu-Shao Liu
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Publication number: 20130038298Abstract: A charge recycling circuit is configured to recycle charges which are discharged by a driving circuit during a discharge period and provide the recycled charges for charging the driving circuit during a charge period. Power consumption in the driving circuit may thus be reduced.Type: ApplicationFiled: January 8, 2012Publication date: February 14, 2013Inventor: Chih-Jen Yen
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Publication number: 20130033527Abstract: A driving apparatus for display and a driving method thereof are provided. The driving apparatus includes a display data detector, a power controller and a source driver. The display data detector is used for detecting a plurality of display data and generating a control signal according to a maximal value of the display data, in which the display data are corresponding to a plurality of gamma voltages. The power controller is for receiving the control signal and providing a driving power according to the control signal. The source driver is for receiving the driving power as an operation power and generating a driving voltage corresponding to each of the display data according to the driving power and each of the gamma voltages.Type: ApplicationFiled: June 6, 2012Publication date: February 7, 2013Applicant: Novatek Microelectronics Corp.Inventor: Chih-Jen Yen
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Patent number: 8350544Abstract: A voltage conversion device capable of enhancing conversion efficiency includes a charge pump for generating output voltage linear to input voltage according to the input voltage, a feedback unit for generating a feedback signal according to the output voltage generated by the charge pump, and a regulating unit for outputting and adjusting the input voltage according to the feedback signal provided by the feedback unit, so as to keep the output voltage unchanged.Type: GrantFiled: January 3, 2012Date of Patent: January 8, 2013Assignee: NOVATEK Microelectronics Corp.Inventors: Chih-Jen Yen, Tsung-Yin Yu
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Patent number: 8314597Abstract: A load driving apparatus is provided. The load driving apparatus is configured to output an electrical signal to a load. The load driving apparatus includes a driver and an average voltage/current detector. The driver receives an input voltage and a control signal. The driver tunes the electrical signal according to the control signal. The average voltage/current detector receives the electrical signal outputted to the load and generates the control signal by comparing the electrical signal and a reference signal.Type: GrantFiled: March 8, 2010Date of Patent: November 20, 2012Assignee: Novatek Microelectronics Corp.Inventors: Chih-Yuan Hsieh, Wei-Jen Lai, Chih-Jen Yen
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Publication number: 20120242644Abstract: A frame maintaining circuit including a detection circuit and a display control circuit is provided. The detection circuit detects an unusual status to output a status feedback signal. The display control circuit maintains a frame displayed by a display apparatus according to the status feedback signal until the unusual status ceases.Type: ApplicationFiled: June 8, 2012Publication date: September 27, 2012Applicant: NOVATEK MICROELECTRONICS CORPInventors: Yueh-Hsiu LIU, Hsun-Yih Li, Chih-Yung Hsu, Yu -Shau Liu, Chih-Jen Yen
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Publication number: 20120194575Abstract: A gamma-voltage generator is provided to generating a plurality of first gamma voltages and second gamma voltages. At least one of the first gamma voltages generated by DACs of the gamma-voltage generator within a first frame period and at least one of the second gamma voltages generated by the DACs within a second frame period are outputted from a same one of the gamma buffers of the gamma-voltage generator, whereby the transmitted gamma voltages have substantially equal offset. Therefore, the display quality approaches an ideal condition.Type: ApplicationFiled: April 10, 2012Publication date: August 2, 2012Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Chih-Jen Yen, Yueh-Hsiu Liu, Ju-Lin Huang, Peng-Yu Chen, Yu-Shao Liu
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Publication number: 20120104963Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.Type: ApplicationFiled: January 11, 2012Publication date: May 3, 2012Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh, Lan-Shan Cheng
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Publication number: 20120105037Abstract: A voltage conversion device capable of enhancing conversion efficiency includes a charge pump for generating output voltage linear to input voltage according to the input voltage, a feedback unit for generating a feedback signal according to the output voltage generated by the charge pump, and a regulating unit for outputting and adjusting the input voltage according to the feedback signal provided by the feedback unit, so as to keep the output voltage unchanged.Type: ApplicationFiled: January 3, 2012Publication date: May 3, 2012Inventors: Chih-Jen Yen, Tsung-Yin Yu
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Patent number: 8115408Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.Type: GrantFiled: November 18, 2008Date of Patent: February 14, 2012Assignee: Novatek Microelectronics Corp.Inventors: Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh, Lan-Shan Cheng
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Patent number: 8111054Abstract: A voltage conversion device capable of enhancing conversion efficiency includes a charge pump for generating output voltage linear to input voltage according to the input voltage, a feedback unit for generating a feedback signal according to the output voltage generated by the charge pump, and a regulating unit for outputting and adjusting the input voltage according to the feedback signal provided by the feedback unit, so as to keep the output voltage unchanged.Type: GrantFiled: August 3, 2007Date of Patent: February 7, 2012Assignee: NOVATEK Microelectronics Corp.Inventors: Chih-Jen Yen, Tsung-Yin Yu
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Patent number: 8106601Abstract: An LED illuminant driving circuit and an automatic brightness compensation method thereof are provided herein. The automatic brightness compensation method includes: providing a target value; detecting an operation period of a pulse of an output of the LED illuminant driving circuit, the pulse is adapted to an LED illuminant for making the light emitting; deciding a peak value according to the target value and the operation period; and setting a peak level of the pulse according to the peak value. The LED illuminant driving circuit and the automatic brightness compensation method thereof provides a stable average current/voltage to the LED illuminant and avoids brightness variations of the light emitting.Type: GrantFiled: June 4, 2009Date of Patent: January 31, 2012Assignee: Novatek Microelectronics Corp.Inventors: Yi-Te Liu, Chih-Yuan Hsieh, Chih-Jen Yen
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Patent number: 8040180Abstract: An operational amplifier capable of compensating offset voltage includes an input stage circuit having a positive input end, a negative input end, a first current output end, and a second current output end, for outputting current corresponding to voltage received by the positive and negative input ends, an output stage circuit coupled to the first current output end and the second current output end of the input stage circuit, for outputting voltage according to current outputted from the first current output end and the second current output end, and an trimming device coupled between the input stage circuit and the output stage circuit, for adjusting current of the first current output end or the second current output end for compensating offset voltage.Type: GrantFiled: July 5, 2007Date of Patent: October 18, 2011Assignee: NOVATEK Microelectronics Corp.Inventors: Chih-Jen Yen, Chih-Yuan Hsieh
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Patent number: 8013540Abstract: A light adjusting device for a light emitting diode includes a switch, a detecting unit and an illumination adjusting unit. The switch is coupled to a power terminal, which is utilized for providing power for the light emitting diode. The detecting unit is coupled to the switch, and is utilized for determining a status of the switch, so as to generate a detecting result. The illumination adjusting unit is coupled to the detecting unit, and is utilized for adjusting illumination of the light emitting diode according to the detecting result.Type: GrantFiled: October 30, 2008Date of Patent: September 6, 2011Assignee: NOVATEK Microelectronics Corp.Inventors: Chen-Ming Hung, Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh
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Publication number: 20110012571Abstract: A load driving apparatus is provided. The load driving apparatus is configured to output an electrical signal to a load. The load driving apparatus includes a driver and an average voltage/current detector. The driver receives an input voltage and a control signal. The driver tunes the electrical signal according to the control signal. The average voltage/current detector receives the electrical signal outputted to the load and generates the control signal by comparing the electrical signal and a reference signal.Type: ApplicationFiled: March 8, 2010Publication date: January 20, 2011Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Chih-Yuan Hsieh, Wei-Jen Lai, Chih-Jen Yen