Patents by Inventor Gyu Hyeong Cho

Gyu Hyeong Cho 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).

  • Publication number: 20170212540
    Abstract: A low dropout voltage (LDO) regulator including: a coarse loop circuit configured to receive an input voltage, generate a coarse code and adjust a coarse current according to the coarse code; a digital controller configured to receive the coarse code and generate a fine loop control signal according to the coarse code; and a fine loop circuit configured to receive the input voltage and the fine loop control signal and adjust a fine current according to the input voltage and the fine loop control signal, wherein the coarse current and the fine current adjust a level of an output voltage.
    Type: Application
    Filed: July 21, 2016
    Publication date: July 27, 2017
    Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: GYU-HYEONG CHO, YONGJIN LEE, DAE-YONG KIM, SANGHO KIM
  • Patent number: 9691329
    Abstract: An organic light emitting display device includes pixels positioned at crossing regions between data lines and scan lines, each of the pixels including an organic light emitting diode, a scan driver configured to supply a scan signal to scan lines, a data driver configured to drive the data lines, wherein the data driver includes, in each channel, a supply part comprising a digital-to-analog converter configured to generate data signals using second data supplied from outside in a driving period, and a deterioration part configured to measure deterioration information of the organic light emitting diode using the digital-to-analog converter in a sensing period.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: June 27, 2017
    Assignees: Samsung Display Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Oh-Jo Kwon, Won-Tae Choi, Hee-Sun Ahn, Bo-Yeon Kim, Gyu-Hyeong Cho, Hyun-Sik Kim, Jun-Suk Bang
  • Publication number: 20170149403
    Abstract: A class-D amplifier includes an error amplification circuit, a duty signal generator, a level selection circuit, a driver and control block and an output stage. The class-D amplifier divides peal levels of an error signal into multi-level and changes a scheme for modulating the error signal when the error signal crosses each level boundary of the multi-level thereby to have an effect such as the error signal is folded. Therefore, the class-D amplifier drives output nodes with multi-level and thus the class-D amplifier may increasing efficiency while reducing EMI.
    Type: Application
    Filed: November 8, 2016
    Publication date: May 25, 2017
    Applicant: Korea Advanced Institute of Science and Technology
    Inventors: Gyu-Hyeong Cho, Ji-Hun Lee
  • Patent number: 9576536
    Abstract: A display device according to an embodiment of the present invention includes: a pixel configured to emit light according to a data signal supplied to a data line, a power source voltage supplier configured to supply a power source voltage to the pixel, a driving transistor configured to drive the pixel to be emitted according to the data signal and the power source voltage, and a sensor configured to supply a test signal to a data line and to detect a sensing current flowing to the data line through the driving transistor according to the test signal.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: February 21, 2017
    Assignees: Samsung Display Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Oh Jo Kwon, Kyung Youl Min, Choong Sun Shin, Hee Sun Ahn, Hyun Sik Kim, Jun Suk Bang, Gyu Hyeong Cho
  • Publication number: 20170019133
    Abstract: A power supply apparatus for a power amplifier includes a converter configured to convert input power into driving power for the power amplifier, a detector configured to transfer the driving power from the converter to the power amplifier, including an inductor formed on a detection path of the driving power, and configured to detect power information regarding the driving power to generate a detected signal, and a controller configured to control power conversion of the converter based on an envelope signal of a signal input to the power amplifier and the detected signal.
    Type: Application
    Filed: May 5, 2016
    Publication date: January 19, 2017
    Applicants: Samsung Electro-Mechanics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Hui Dong GWON, Gyu Hyeong CHO, Jeong Hoon KIM
  • Publication number: 20160372050
    Abstract: A data driver includes a data signal converter to convert image data to a data signal, an output buffer to output the data signal to a data line, a first cascode circuit connected to the output buffer and including a plurality of transistors, a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and to attenuate a first current noise, a second cascode circuit connected to the output buffer and including a plurality of transistors, a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and to attenuate a second current noise, a current integrator to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascade circuit, and an analog-digital converter (ADC) to convert the integrated voltage to a digital signal.
    Type: Application
    Filed: December 29, 2015
    Publication date: December 22, 2016
    Inventors: Oh-Jo Kwon, Ji-Woong Kim, Choong-Sun Shin, Joo-Hyung Lee, Jun-Suk Bang, Gyu-Hyeong Cho
  • Publication number: 20160372044
    Abstract: A display device includes pixels at respective crossing regions of scan lines and data lines, a scan driver that is configured to supply a scan signal to the scan lines, and a data driver that is configured to supply a pre-emphasis voltage to the data lines using a first constant for controlling a voltage value of the pre-emphasis voltage, and using a second constant for controlling a supply time of the pre-emphasis voltage, and supply data signals to the data lines after the supply of the pre-emphasis voltage, wherein at least one of the first or second constants is stored in each channel corresponding to each of the data lines.
    Type: Application
    Filed: March 11, 2016
    Publication date: December 22, 2016
    Inventors: Oh Jo Kwon, Ji Woong Kim, Choong Sun Shin, Joo Hyung Lee, Jun Suk Bang, Gyu Hyeong Cho
  • Patent number: 9443569
    Abstract: A driver for semiconductor memory, comprising: a storage unit configured to match and store a memory cell address and bucket charge current data corresponding to the memory cell address; a selection controller configured to receive the memory cell address and a target charge current data, and output a bucket charge current select signal and a target charge current select signal corresponding to the bucket charge current data and the target charge current data, respectively, by referring to the storage unit; and a current supply unit configured to supply a bucket charge current and a target charge current in response to the bucket charge current select signal and the target charge current select signal, respectively.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: September 13, 2016
    Assignees: SK Hynix Inc., Korea Advanced Institute of Science and Technology
    Inventors: Gyu Hyeong Cho, Suk Hwan Choi
  • Patent number: 9438062
    Abstract: A wireless electric power receiver for receiving wireless electric power from a wireless electric transmitter is provided. The wireless electric power receiver includes an electric power receiving unit that receives wireless electric power from the wireless electric power transmitter; a rectifying unit that rectifies wireless electric power in the form of alternating current output from the wireless electric power receiving unit and outputs rectified electric power; and an electric power regulation unit that receives an input of the rectified electric power, outputs first electric power which has a lower value of a first voltage than that of the rectified electric power for a first period, and does not output electric power for a second period, so as to output electric power with a predetermined voltage value.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: September 6, 2016
    Assignees: Samsung Electronics Co., Ltd, Korea Advanced Institute of Science and Technology
    Inventors: Sung-Ku Yeo, Gyu-Hyeong Cho, Jun-Han Choi, Se-Ho Park, Jeong-Seok Lee
  • Patent number: 9391535
    Abstract: Provided is a received power conversion device for a resonant wireless charging system, including a wireless power receiver for receiving wireless power from a wireless power transmission device, a rectifier for rectifying power in an Alternating Current (AC) form received in the wireless power receiver into a Direct Current (DC), a free-wheeling switching unit for switching according to a switching control signal to form a path for free-wheeling the power in the AC form, a feedback circuit fed back with an output signal of a corresponding power conversion device to detect a level of the output signal, and a controller for controlling switching of the free-wheeling switching unit according to the output level detected by the feedback circuit.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: July 12, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Ku Yeo, Gyu-Hyeong Cho, Se-Ho Park, Se-Ki Kim, Young-Min Lee, Jun-Han Choi
  • Patent number: 9372560
    Abstract: The present invention relates to a signal detection system of a touch screen, and more particularly to a signal detection system of a large-sized mutual capacitive multi touch screen that is capable of effectively reducing RC time delay, signal distortion, an effect of noise, parasitic resistance, and parasitic capacitance.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: June 21, 2016
    Assignee: IKAIST CO., LTD.
    Inventors: Gyu Hyeong Cho, Sang Hui Park, Gyu Ha Cho, Chul Kweon, Joo Yeong Yoon, Sung Jin Kim, Soo Hyun Park
  • Patent number: 9312004
    Abstract: A driver for a semiconductor memory may reduce an error in writing data in memory cells by adjusting the height and width of a spike current, when the memory cells in which data having the same level are written are arranged at different distances. In addition, the driver may reduce the error by controlling the amount of charges supplied to each of the memory cells that are arranged at different distances.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: April 12, 2016
    Assignees: SK HYNIX INC., KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Gyu Hyeong Cho, Suk Hwan Choi
  • Publication number: 20160085375
    Abstract: A touch sensing device for measuring a contact position of an object by measuring a change in capacitance caused by contact of an object is provided. The touch sensing device includes a touch screen panel on which channel electrodes functioning as a transmission antenna or a reception antenna are disposed to form a plurality of electrode patterns, a transmission circuit connected to the channel electrodes to apply an electrical signal to the touch screen panel, a reception circuit connected to the channel electrodes to sense a varying capacitance from the plurality of electrode patterns, and a controller configured to control the touch screen panel, the transmission circuit and the reception circuit.
    Type: Application
    Filed: September 3, 2015
    Publication date: March 24, 2016
    Inventors: Sung-Soo PARK, Chang-Byung PARK, Gyu-Hyeong CHO
  • Publication number: 20160070387
    Abstract: A coordinate indicating apparatus includes a channel electrode which includes a first plurality of electrodes arranged in a first direction and a second plurality of electrodes arranged in a second direction perpendicular to the first direction, and which has capacitance between the first plurality of electrodes and the second plurality of electrodes, the capacitance being changed by an approaching contact object; a driver configured to apply driving signals to the first plurality of electrodes simultaneously; a receiver configured to receive response signals from the second plurality of electrodes; and a controller configured to determine a location of the contact object based on the driving signals transmitted to the first plurality of electrodes and the response signals received from the second plurality of electrodes, wherein the driver is configured to simultaneously apply, to the first plurality of electrodes, continuous driving signals according to a matrix corresponding to a Hadamard matrix, and where
    Type: Application
    Filed: September 4, 2015
    Publication date: March 10, 2016
    Applicants: SAMSUNG ELECTRONICS CO., LTD., KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Sung-soo PARK, Byung-hoon KANG, Chang-byung PARK, Gyu-hyeong CHO
  • Publication number: 20160062511
    Abstract: Provided is a coordinate measuring device for sensing a location of a coordinate indicating device including a resonance circuit. The coordinate measuring device includes a panel including a plurality of channel electrodes configured to transmit a driving signal to the coordinate indicating device through capacitive coupling with the coordinate indicating device and receive a resonance signal generated by the coordinate indicating device, wherein the coordinate indicating device resonates based on the driving signal; and a controller configured to sense at least one of a frequency and a phase of the resonance signal and adjust the driving signal according to the at least one of the frequency and the phase, which is sensed.
    Type: Application
    Filed: August 18, 2015
    Publication date: March 3, 2016
    Applicants: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sung-soo PARK, Byung-hoon KANG, Chang-byung PARK, Gyu-hyeong CHO
  • Patent number: 9239391
    Abstract: An apparatus for distinguishing an energy band of a photon in a readout circuit that counts photons in multi-energy radiation incident onto a sensor for each energy band includes an integrator configured to accumulate an electric signal received from the sensor that has undergone photoelectric conversion from the photon; a comparator configured to compare an accumulated electric signal received from the integrator with one of a plurality of threshold values; and a signal processor configured to instruct sequential switching from one of the plurality of threshold values to another one of the plurality of threshold values according to a result of a comparison received from the comparator; and output a digital signal that distinguishes an energy band of the photon based on results received from the comparator of sequential comparisons of the accumulated electric signal with the plurality of threshold values.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: January 19, 2016
    Assignees: Samsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Sang-wook Han, Hyun-sik Kim, Jun-hyeok Yang, Gyu-hyeong Cho, Young-hun Sung
  • Publication number: 20150309655
    Abstract: A device for sensing a touch by measuring a variation in capacitance according to a contact of an object, and measuring a contact position of the object is provided. The device includes a touch screen panel comprising grid electrodes forming a plurality of electrode patterns, the grid electrodes serving as Tx antennas or Rx antennas, a Tx circuit unit connected with the grid electrode to apply an electric signal to the touch screen panel unit, an Rx circuit unit connected with the grid electrodes to sense variations in the capacitance in the plurality of electrode patterns, and a controller configured to control the touch screen panel unit, the Tx circuit unit, and the Rx circuit unit. The Rx circuit unit includes a first operational amplifier, a first feedback capacitor, and a second feedback capacitor. The first feedback capacitor and the second feedback capacitor are connected with the first operational amplifier.
    Type: Application
    Filed: April 27, 2015
    Publication date: October 29, 2015
    Inventors: Sung-Soo Park, Chang-Byung Park, Gyu-Hyeong Cho
  • Patent number: 9143002
    Abstract: A wireless electric power receiver for receiving wireless electric power from a wireless electric transmitter is provided. The wireless electric power receiver includes an electric power receiving unit that receives wireless electric power from the wireless electric power transmitter; a rectifying unit that rectifies wireless electric power in the form of alternating current output from the wireless electric power receiving unit and outputs rectified electric power; and an electric power regulation unit that receives an input of the rectified electric power, outputs first electric power which has a lower value of a first voltage than that of the rectified electric power for a first period, and does not output electric power for a second period, so as to output electric power with a predetermined voltage value.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: September 22, 2015
    Assignees: Samsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Sung-Ku Yeo, Gyu-Hyeong Cho, Se-Ho Park, Jun-Han Choi
  • Publication number: 20150263621
    Abstract: Disclosed are a method and apparatus for controlling a booster circuit such that maximum power is extracted from a power supply while power consumption for monitoring power generated by the power supply is reduced, and an apparatus for extracting maximum power by using the method and apparatus for controlling a booster circuit.
    Type: Application
    Filed: March 9, 2015
    Publication date: September 17, 2015
    Inventors: Je-in YU, Gyu-hyeong Cho, Kyu-sub Kwak, Hui-dong Gwon, June-hyeon Ahn, Young-sub Yuk
  • Patent number: 9086494
    Abstract: According to example embodiments, an image sensor includes a charge sensing amplifier configured to amplify charges sensed by a sensing unit. The charge sensing amplifier includes an input terminal, an amplification terminal, an output terminal, a first capacitor connected between the input terminal and the amplification terminal, a first switch connected between the input terminal and the amplification terminal, a second capacitor connected between the amplification terminal and the output terminal, and a second switch connected between the output terminal and a reference voltage terminal.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: July 21, 2015
    Assignees: SAMSUNG ELECTRONICS CO., LTD., KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Sang-wook Han, Hyun-Sik Kim, Gyu-Hyeong Cho, Chang-jung Kim, Jae-chul Park, Young-Hun Sung, Young Kim, Jun-Hyeok Yang