Patents by Inventor Tae-Kwang Park
Tae-Kwang Park 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: 11917907Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.Type: GrantFiled: November 22, 2021Date of Patent: February 27, 2024Assignee: Rohm and Haas Electronic Materials Korea Ltd.Inventors: Kyoung-Jin Park, Tae-Jin Lee, Jae-Hoon Shim, Yoo Jin Doh, Hee-Choon Ahn, Young-Kwang Kim, Doo-Hyeon Moon, Jeong-Eun Yang, Su-Hyun Lee, Chi-Sik Kim, Ji-Song Jun
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Patent number: 11777339Abstract: In an embodiment, a wireless power transmitter is disclosed that includes a first field-effect transistor, a second field-effect transistor a coil and an analog front end. The wireless power transmitter is configured to drive the coil based at least in part on activations of the first and second field-effect transistors. The analog front end includes a first driver corresponding to the first field-effect transistor and being configured to control activation of the first field-effect transistor based at least in part on a pulse-width modulation signal and a second driver corresponding to the second field-effect transistor and being configured to control activation of the second field-effect transistor based at least in part on the pulse-width modulation signal.Type: GrantFiled: December 31, 2021Date of Patent: October 3, 2023Assignee: Renesas Electronics America Inc.Inventors: Gustavo James Mehas, Tae Kwang Park, Giovanni Figliozzi
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Publication number: 20230216342Abstract: In an embodiment, a wireless power transmitter is disclosed that includes a first field-effect transistor, a second field-effect transistor a coil and an analog front end. The wireless power transmitter is configured to drive the coil based at least in part on activations of the first and second field-effect transistors. The analog front end includes a first driver corresponding to the first field-effect transistor and being configured to control activation of the first field-effect transistor based at least in part on a pulse-width modulation signal and a second driver corresponding to the second field-effect transistor and being configured to control activation of the second field-effect transistor based at least in part on the pulse-width modulation signal.Type: ApplicationFiled: December 31, 2021Publication date: July 6, 2023Applicant: Renesas Electronics America Inc.Inventors: Gustavo James MEHAS, Tae Kwang PARK, Giovanni FIGLIOZZI
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Publication number: 20210280621Abstract: The present invention relates to an optical disc capable of positioning a fingerprint recognition region in a screen of a display, and an optical filter comprising same. The optical disc according to the present invention comprises a light absorption layer, which transmits light in a green region of visible light to increase a fingerprint recognition rate and effectively absorbs light in a red region so as to suppress a phenomenon in which the fingerprint recognition region in the screen of the display appears in red.Type: ApplicationFiled: July 1, 2019Publication date: September 9, 2021Inventors: Jeong Og CHOI, Jin Hwan KIM, Young Soo AN, Seon Ho YANG, Tae Kwang PARK, Woo Joo LAH
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Publication number: 20210191013Abstract: Provided is a near-infrared ray absorbing article. A near-infrared ray absorbing article of the present invention is capable of preventing a decrease in visible transmittance and near-infrared absorption due to the interaction between a plurality of organic materials forming light-absorbing layers. In addition, the near-infrared ray absorbing article of the present invention has the advantage of being able to be thinner.Type: ApplicationFiled: December 1, 2020Publication date: June 24, 2021Inventors: Sung Hwan MOON, Seung Man HAN, Seon Ho YANG, Tae Kwang PARK, Joon Ho JUNG, Bo Chul KANG, Hee Kyeong KIM, Seong Don HWANG, Seong Yong YOON, Ho Seong NA, Ji Tae KIM
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Patent number: 10963764Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: GrantFiled: July 12, 2019Date of Patent: March 30, 2021Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
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Patent number: 10699175Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: GrantFiled: March 27, 2019Date of Patent: June 30, 2020Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
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Patent number: 10637356Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.Type: GrantFiled: April 3, 2018Date of Patent: April 28, 2020Assignee: Integrated Device Technology, Inc.Inventors: Gustavo Mehas, Rui Liu, Lijie Zhao, Siqiang Fan, Tae Kwang Park, Zhitong Guo
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Patent number: 10554061Abstract: A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.Type: GrantFiled: November 30, 2017Date of Patent: February 4, 2020Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Gustavo James Mehas, Lijie Zhao, Tae Kwang Park, Zhitong Guo
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Publication number: 20190332909Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: ApplicationFiled: July 12, 2019Publication date: October 31, 2019Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
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Publication number: 20190325280Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: ApplicationFiled: March 27, 2019Publication date: October 24, 2019Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
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Patent number: 10360485Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: GrantFiled: August 28, 2017Date of Patent: July 23, 2019Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
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Publication number: 20180287497Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.Type: ApplicationFiled: April 3, 2018Publication date: October 4, 2018Inventors: Gustavo MEHAS, Rui LIU, Lijie ZHAO, Siqiang FAN, Tae Kwang PARK, Zhitong GUO
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Publication number: 20180159346Abstract: A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.Type: ApplicationFiled: November 30, 2017Publication date: June 7, 2018Inventors: Rui LIU, Gustavo James MEHAS, Lijie ZHAO, Tae Kwang PARK, Zhitong GUO
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Publication number: 20180060712Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: ApplicationFiled: August 28, 2017Publication date: March 1, 2018Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
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Publication number: 20110242045Abstract: A touch controller to be used by a touch screen device to provide a touch position is disclosed, including a plurality of capacitance sensing channels that each provide an analog signal responsive to a touch on a screen; a channel multiplexer to select at least one of the plurality of channels; an analog-to-digital converter to change the analog signal of the selected capacitance sensing channel to a digital signal; a noise detecting channel coupled to a noise analog-to-digital converter to generate a noise digital signal; a noise blocking timing generation block that combines a time shifted digital signal and a blocking signal, wherein the time shifted digital signal is formed by time shifting the digital signal and the blocking signal is related to the noise signal; a capacitance calculating block coupled to the noise blocking time generation block to calculate capacitance values for each of the capacitance sensing channels; and a position calculation unit to find the touch position on the screen based on tType: ApplicationFiled: April 6, 2010Publication date: October 6, 2011Inventors: TAE KWANG PARK, ARUN JAYARAMAN
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Publication number: 20080284759Abstract: Disclosed are a device and a method for driving a display element that adjusts a backlight luminescence to be suitable for a mean luminescence of an image data for each frame, analyzes the mean, maximum and minimum luminescence of an image to be displayed to reduce power consumption due to unnecessary backlight luminescence, and then adjusts the backlight luminescence in accordance with the analyzed result. The device for driving a display element includes a buffer memory, a histogram analyzer, a main memory, a maximum luminescence determining and mapping unit and a digital-to-analog converter (DAC). When an image data to be displayed for each frame is inputted to the buffer memory, the histogram analyzer analyzes the image data for each frame to calculate a mean luminescence, a maximum/minimum luminescence and a histogram for each of the R, G and B colors, and then outputs the analyzed image data for each frame to the maximum luminescence determining and mapping unit.Type: ApplicationFiled: May 1, 2008Publication date: November 20, 2008Applicant: Leadis Technology, Inc.Inventor: Tae Kwang Park
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Patent number: 7068248Abstract: A single-chip column driver for organic light emitting diode (OLED) display is disclosed. Instead of using two column drivers for dual scan, the present invention uses one column driver driving both the upper and the lower OLED panels. The column driver has a two set of output circuitry: one for driving the upper panel and the other for driving the lower panel. The single chip solution of the present invention eliminates the problem of display uniformity without increasing the part count. The invention also enables independent control of RGB without further increasing the part count.Type: GrantFiled: August 30, 2002Date of Patent: June 27, 2006Assignee: Leadis Technology, Inc.Inventors: Sung Tae Ahn, Keunmyung Lee, Dae Young Ahn, Tae Kwang Park
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Patent number: 6919872Abstract: A driver for driving an STN LCD is disclosed. A preferred embodiment comprises a 3-line output display data for storing display data, an XOR block for finding mismatches between each 3-line output set of the stored display and orthogonal function signals, a decoder block for calculating mismatch numbers, a level shifter block for shifting the data level of the mismatch numbers to another level, and a voltage selector block for selecting a voltage level from 2 levels of voltage. Because data latches and output latches are not necessary, the driver of the present invention achieves significant reduction in the circuit components and chip size without compromising the display quality.Type: GrantFiled: February 25, 2002Date of Patent: July 19, 2005Assignee: Leadis Technology, Inc.Inventors: Tae-Kwang Park, Keunmyung Lee
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Publication number: 20030058203Abstract: A single-chip column driver for organic light emitting diode (OLED) display is disclosed. Instead of using two column drivers for dual scan, the present invention uses one column driver driving both the upper and the lower OLED panels. The column driver has a two set of output circuitry: one for driving the upper panel and the other for driving the lower panel. The single chip solution of the present invention eliminates the problem of display uniformity without increasing the part count. The invention also enables independent control of RGB without further increasing the part count.Type: ApplicationFiled: August 30, 2002Publication date: March 27, 2003Inventors: Sung Tae Ahn, Keunmyung Lee, Dae Young Ahn, Tae Kwang Park