Patents by Inventor Yang Uk NAM
Yang Uk NAM 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: 11881150Abstract: A display device including: a power management integrated circuit (IC) including a feedback terminal for receiving a feedback voltage that corresponds to an input voltage and an output terminal for supplying a first voltage; a display driver IC electrically connected to the power management IC, the display driver IC including an input terminal for receiving the input voltage that corresponds to the first voltage; and a frequency compensation circuit connected to the input terminal, the feedback terminal, and the output terminal, the frequency compensation circuit including a feedback capacitor and a feedback resistor.Type: GrantFiled: July 25, 2022Date of Patent: January 23, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Yang Uk Nam, Sung Chun Park
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Patent number: 11722059Abstract: A DC-DC converter may include: a first converter for converting an input voltage to generate a first power supply voltage; a duty ratio controller configured generate a duty ratio control signal for controlling a duty ratio of a switching pulse of the first converter; a switching frequency controller configured to generate a switching frequency control signal for controlling a driving frequency of the first converter corresponding to a switching frequency of the switching pulse; and a current sensor configured to sense current flowing through the first converter. The first converter is driven at a switching frequency of a first frequency in a first mode, based on the switching frequency control signal, and generates the first power supply voltage of a first level, based on the duty ratio control signal. The switching frequency controller determines whether to turn off the current sensor.Type: GrantFiled: September 8, 2022Date of Patent: August 8, 2023Assignee: SAMSUNG DISPLAY CO., LTD.Inventor: Yang Uk Nam
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Publication number: 20230237952Abstract: A display device including: a power management integrated circuit (IC) including a feedback terminal for receiving a feedback voltage that corresponds to an input voltage and an output terminal for supplying a first voltage; a display driver IC electrically connected to the power management IC, the display driver IC including an input terminal for receiving the input voltage that corresponds to the first voltage; and a frequency compensation circuit connected to the input terminal, the feedback terminal, and the output terminal, the frequency compensation circuit including a feedback capacitor and a feedback resistor.Type: ApplicationFiled: July 25, 2022Publication date: July 27, 2023Inventors: Yang Uk Nam, Sung Chun Park
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Publication number: 20230155474Abstract: A DC-DC converter includes a first converter outputting a first power voltage in a first driving method of generating an inductor current by alternately turning on transistors in a normal mode and outputting the first power voltage in a second driving method of generating the inductor current with the number of turn-on times less than that of the first driving method in a power saving mode, a second converter outputting a second power voltage in a third driving method of generating the inductor current with the number of turn-on times less than that of the second driving method in the power saving mode and determining differently magnitudes of the second power voltage in the power saving mode and the second power voltage in the normal mode, and a mode selector supplying a mode control signal to the converters to drive the converters according to one of the modes.Type: ApplicationFiled: May 26, 2022Publication date: May 18, 2023Inventors: Yang UK NAM, Sung Chun PARK
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Publication number: 20230006553Abstract: A DC-DC converter may include: a first converter for converting an input voltage to generate a first power supply voltage; a duty ratio controller configured generate a duty ratio control signal for controlling a duty ratio of a switching pulse of the first converter; a switching frequency controller configured to generate a switching frequency control signal for controlling a driving frequency of the first converter corresponding to a switching frequency of the switching pulse; and a current sensor configured to sense current flowing through the first converter. The first converter is driven at a switching frequency of a first frequency in a first mode, based on the switching frequency control signal, and generates the first power supply voltage of a first level, based on the duty ratio control signal. The switching frequency controller determines whether to turn off the current sensor.Type: ApplicationFiled: September 8, 2022Publication date: January 5, 2023Inventor: Yang Uk NAM
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Patent number: 11463001Abstract: A DC-DC converter may include: a first converter for converting an input voltage to generate a first power supply voltage; a duty ratio controller configured generate a duty ratio control signal for controlling a duty ratio of a switching pulse of the first converter; a switching frequency controller configured to generate a switching frequency control signal for controlling a driving frequency of the first converter corresponding to a switching frequency of the switching pulse; and a current sensor configured to sense current flowing through the first converter. The first converter is driven at a switching frequency of a first frequency in a first mode, based on the switching frequency control signal, and generates the first power supply voltage of a first level, based on the duty ratio control signal. The switching frequency controller determines whether to turn off the current sensor.Type: GrantFiled: May 27, 2021Date of Patent: October 4, 2022Assignee: SAMSUNG DISPLAY CO., LTD.Inventor: Yang Uk Nam
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Patent number: 11348519Abstract: A display device includes pixels, and a power converter configured to receive a first power voltage and an external input voltage and provide a gamma voltage to a first output terminal. The power converter includes a target power voltage generator circuit configured to generate a target power voltage, a first gamma voltage generator circuit configured to generate a first gamma voltage, a second gamma voltage generator circuit configured to generate a second gamma voltage, a first gap controller configured to generate the second gamma voltage based on the first power voltage, a reference target power voltage, and a reference gamma voltage during a period in which a display mode, and a first selector configured to selectively output the first gamma voltage or the second gamma voltage according to the display mode.Type: GrantFiled: November 23, 2020Date of Patent: May 31, 2022Assignee: SAMSUNG DISPLAY CO., LTD.Inventor: Yang Uk Nam
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Publication number: 20220149730Abstract: A DC-DC converter may include: a first converter for converting an input voltage to generate a first power supply voltage; a duty ratio controller configured generate a duty ratio control signal for controlling a duty ratio of a switching pulse of the first converter; a switching frequency controller configured to generate a switching frequency control signal for controlling a driving frequency of the first converter corresponding to a switching frequency of the switching pulse; and a current sensor configured to sense current flowing through the first converter. The first converter is driven at a switching frequency of a first frequency in a first mode, based on the switching frequency control signal, and generates the first power supply voltage of a first level, based on the duty ratio control signal. The switching frequency controller determines whether to turn off the current sensor.Type: ApplicationFiled: May 27, 2021Publication date: May 12, 2022Inventor: Yang Uk NAM
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Patent number: 11250762Abstract: A display device includes a display panel including a plurality of pixels and a power line, and displaying an image in a normal mode or a power saving mode, a data driver which provides a data signal to the pixels, and a power supply which supplies a source driving voltage to the data driver and supplies a first power voltage to the power line in the normal mode. The data driver supplies a first auxiliary power voltage to the power line in the power saving mode, and the power supply outputs the first power voltage by decreasing a voltage level of the first power voltage to a first power saving voltage level in a vertical blank period in which the pixels do not display an image during a first switching period changing from the normal mode to the power saving mode.Type: GrantFiled: September 10, 2020Date of Patent: February 15, 2022Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Yang Uk Nam, Sung Chun Park
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Publication number: 20210327350Abstract: A display device includes pixels, and a power converter configured to receive a first power voltage and an external input voltage and provide a gamma voltage to a first output terminal. The power converter includes a target power voltage generator circuit configured to generate a target power voltage, a first gamma voltage generator circuit configured to generate a first gamma voltage, a second gamma voltage generator circuit configured to generate a second gamma voltage, a first gap controller configured to generate the second gamma voltage based on the first power voltage, a reference target power voltage, and a reference gamma voltage during a period in which a display mode, and a first selector configured to selectively output the first gamma voltage or the second gamma voltage according to the display mode.Type: ApplicationFiled: November 23, 2020Publication date: October 21, 2021Inventor: YANG UK NAM
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Patent number: 11132938Abstract: A display device includes: pixels; and a power converter for receiving a first voltage, converting the first voltage to a second voltage, and providing an output terminal with the second voltage to control the pixels. The power converter includes: a first variable load connected to the output terminal of the power converter; a first comparator for providing a comparison result by comparing a difference between a first feedback voltage of the first voltage and a second feedback voltage of the second voltage; and a gap controller for controlling a magnitude of the first variable load to maintain the difference between the first voltage and the second voltage to be greater than or equal to a gap, based on the comparison result received from the first comparator.Type: GrantFiled: March 12, 2020Date of Patent: September 28, 2021Inventor: Yang Uk Nam
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Publication number: 20210280121Abstract: A display device includes a display panel including a plurality of pixels and a power line, and displaying an image in a normal mode or a power saving mode, a data driver which provides a data signal to the pixels, and a power supply which supplies a source driving voltage to the data driver and supplies a first power voltage to the power line in the normal mode. The data driver supplies a first auxiliary power voltage to the power line in the power saving mode, and the power supply outputs the first power voltage by decreasing a voltage level of the first power voltage to a first power saving voltage level in a vertical blank period in which the pixels do not display an image during a first switching period changing from the normal mode to the power saving mode.Type: ApplicationFiled: September 10, 2020Publication date: September 9, 2021Inventors: Yang Uk NAM, Sung Chun PARK
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Publication number: 20210043132Abstract: A display device includes: pixels; and a power converter for receiving a first voltage, converting the first voltage to a second voltage, and providing an output terminal with the second voltage to control the pixels. The power converter includes: a first variable load connected to the output terminal of the power converter; a first comparator for providing a comparison result by comparing a difference between a first feedback voltage of the first voltage and a second feedback voltage of the second voltage; and a gap controller for controlling a magnitude of the first variable load to maintain the difference between the first voltage and the second voltage to be greater than or equal to a gap, based on the comparison result received from the first comparator.Type: ApplicationFiled: March 12, 2020Publication date: February 11, 2021Inventor: Yang Uk NAM
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Patent number: 10643512Abstract: A display device includes a display unit, a driving voltage supply unit which supplies a driving voltage to the display unit, a ripple detection circuit which detects the number of times a ripple of the driving voltage is generated, and a controller which controls the driving voltage supply unit so as to change the driving voltage based on the number of times the ripple is generated.Type: GrantFiled: October 24, 2017Date of Patent: May 5, 2020Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Dae Sik Lee, Jong Jae Lee, Su Jin Kim, Yang Uk Nam
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Patent number: 10186960Abstract: A power supply includes a voltage converter circuit which converts an input voltage into an output voltage and outputs the output voltage, a voltage controller which controls the voltage converter circuit in response to a first feedback voltage or a second feedback voltage, a feedback terminal which supplies the first feedback voltage, an internal voltage divider circuit which supplies the second feedback voltage, and a switch unit which transfers the first feedback voltage or the second feedback voltage to the voltage controller.Type: GrantFiled: June 16, 2016Date of Patent: January 22, 2019Assignee: SAMSUNG DISPLAY CO. LTD.Inventors: Seok Hwan Lee, Jong Jae Lee, Yang Uk Nam, Se Young Heo, Jun Ki Hong
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Patent number: 10083671Abstract: A DC-DC converter includes a power switch and a switching controller. The power switch is repetitively turned on and off for generating an output DC voltage based on an input DC voltage. The switching controller controls operation of the power switch, and includes a slew rate controller to adjust a slew rate of a switch voltage of an electrode of the power switch to vary with time.Type: GrantFiled: October 22, 2015Date of Patent: September 25, 2018Assignee: Samsung Display Co., Ltd.Inventors: Jong-Jae Lee, Yang-Uk Nam, Jun-Ki Hong, Jun-Dal Kim, Jang-Hee Park
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Publication number: 20180197446Abstract: A display device includes a display unit, a driving voltage supply unit which supplies a driving voltage to the display unit, a ripple detection circuit which detects the number of times a ripple of the driving voltage is generated, and a controller which controls the driving voltage supply unit so as to change the driving voltage based on the number of times the ripple is generated.Type: ApplicationFiled: October 24, 2017Publication date: July 12, 2018Inventors: Dae Sik LEE, Jong Jae LEE, Su Jin KIM, Yang Uk NAM
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Patent number: 9934753Abstract: A display device includes a scan driver which supplies a gate-on voltage or a gate-off voltage to scan lines, and a power supply unit which supplies the gate-off voltage to the scan driver, and includes a temperature sensor which generates a sensing voltage of which voltage value is changed corresponding to a temperature of a panel or an ambient temperature, a first voltage limiter which limits a minimum voltage value of the sensing voltage, and a second voltage limiter which limits a maximum voltage value of the sensing voltage.Type: GrantFiled: April 19, 2016Date of Patent: April 3, 2018Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Yang Uk Nam, Jong Jae Lee, Su Jin Kim, Dae Sik Lee
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Patent number: 9747861Abstract: A driving voltage generating device, a display device including the same, and a method of generating a driving voltage are provided. The driving voltage generating device includes a driving voltage setting unit receiving initially set data on a driving voltage and a feedback voltage and outputting a control signal, a driving voltage trimmer receiving finely adjusted data on the driving voltage and adjusting the feedback voltage, and a DC to DC converter generating the driving voltage based on the control signal and an input voltage.Type: GrantFiled: June 17, 2014Date of Patent: August 29, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Yang Uk Nam, Jong Jae Lee, Bon-Sung Koo, Jun Dal Kim, Se Young Heo, Jun Ki Hong
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Publication number: 20170170726Abstract: A power supply includes a voltage converter circuit which converts an input voltage into an output voltage and outputs the output voltage, a voltage controller which controls the voltage converter circuit in response to a first feedback voltage or a second feedback voltage, a feedback terminal which supplies the first feedback voltage, an internal voltage divider circuit which supplies the second feedback voltage, and a switch unit which transfers the first feedback voltage or the second feedback voltage to the voltage controller.Type: ApplicationFiled: June 16, 2016Publication date: June 15, 2017Inventors: Seok Hwan LEE, Jong Jae LEE, Yang Uk NAM, Se Young HEO, Jun Ki HONG