Patents by Inventor Dong Myung Lee

Dong Myung Lee 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: 20150067392
    Abstract: A clock data recovery device includes a clock recovery device for separating a recovery clock signal and a data signal from an input signal and generating a clock fail signal in response to noise of the input signal; a clock generator for receiving a control voltage to generate one or more delay clock signals, delaying the recovery clock signal to generate the delay clock signals in a first mode, delaying the generated delay clock signal to generate the delay clock signal in a second mode, and switching the first mode to the second mode in response to the clock fail signal; and a phase frequency detector for comparing at least one of the delay clock signals with the recovery clock signal to generate a voltage adjusting signal; and a control voltage generator for receiving the voltage adjusting signal to generate the control voltage.
    Type: Application
    Filed: June 24, 2014
    Publication date: March 5, 2015
    Inventors: Jung-pil LIM, Dong-Myung LEE
  • Publication number: 20140253535
    Abstract: A source driver integrated circuit (IC) includes a logic circuit configured to receive a transmission data packet including data, a compression code indicating compression or non-compression of the data, and a clock signal, to interpret the compression code, and to generate a sleep mode enable signal based on an interpretation result, and a clock signal recovery circuit configured to enable one of a voltage-controlled delay line and a voltage-controller oscillator in response to the sleep mode enable signal.
    Type: Application
    Filed: February 27, 2014
    Publication date: September 11, 2014
    Inventors: Jung Pil LIM, Dong Myung LEE, Han Si PAE, Kil Hoon LEE, Jae Youl LEE
  • Publication number: 20140192097
    Abstract: A display driver circuit includes a source driver and a display driver. The source driver drives source lines of a display panel, and the timing controller transmits image data to the source driver and controls the source driver such that the transmitted image data is displayed in the display panel. The timing controller randomizes the image data in a scrambling mode when the timing controller transmits data packets including pixel data field in which the image data is written.
    Type: Application
    Filed: January 9, 2014
    Publication date: July 10, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Dong-Hoon BAEK, Jae-Youl LEE, Han-Su PAE, Dong-Myung LEE, Sun-Ik LEE, Yong-Min CHOI
  • Publication number: 20130113777
    Abstract: A method of transferring data between a timing controller and a plurality of source drivers in a display device is disclosed. The method includes: (a) setting a first source driver of the plurality of source drivers to convert first signals having first voltage levels to second signals having second voltage levels; (b) receiving, by the first source driver, a first test pattern from the timing controller; (c) performing a test by the first source driver, based on the first test pattern, to determine whether an error has occurred in the first test pattern; and (d) when an error has occurred in the first test pattern, adjusting, by the first source driver, an output level of a receiver of the first source driver, so that the first source driver converts the first signals to third signals having third voltage levels different from the second voltage levels.
    Type: Application
    Filed: February 10, 2012
    Publication date: May 9, 2013
    Inventors: Dong-Hoon Baek, Jae-Youl Lee, Dong-Myung Lee, Han-Su Pae
  • Publication number: 20110266417
    Abstract: A digital double sampling method, a related complementary metal oxide semiconductor (CMOS) image sensor, and a digital camera comprising the CMOS image sensor are disclosed. The method includes generating first digital data corresponding to an initial voltage level apparent in a pixel in response to a reset signal, inverting the first digital data, outputting a detection voltage corresponding to image data received from outside of the CMOS image sensor, and counting in synchronization with a clock signal, starting from an initial value equal to the inverted first digital data, and for an amount of time responsive to a voltage level of the detection voltage.
    Type: Application
    Filed: July 15, 2011
    Publication date: November 3, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dong-Myung LEE, Gun-Hee HAN, Seog-Heon HAM
  • Patent number: 7995123
    Abstract: A digital double sampling method, a related complementary metal oxide semiconductor (CMOS) image sensor, and a digital camera comprising the CMOS image sensor are disclosed. The method includes generating first digital data corresponding to an initial voltage level apparent in a pixel in response to a reset signal, inverting the first digital data, outputting a detection voltage corresponding to image data received from outside of the CMOS image sensor, and counting in synchronization with a clock signal, starting from an initial value equal to the inverted first digital data, and for an amount of time responsive to a voltage level of the detection voltage.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: August 9, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dong-Myung Lee, Gun-Hee Han, Seog-Heon Ham
  • Patent number: 7985993
    Abstract: A complementary metal oxide semiconductor (CMOS) image sensor includes a photodiode, a switch and a comparator. The switch transfers a sensing signal to a sensing node from the photodiode. The comparator, which is directly connected to the sensing node, compares the sensing signal of the sensing node with a reference signal. The comparator outputs a signal corresponding to a voltage difference between the sensing signal and the reference signal.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: July 26, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dong-Myung Lee, Dong-Soo Kim, Gun-Hee Han, Seog-Heon Ham
  • Patent number: 7679542
    Abstract: An image sensor comprises an active pixel sensor (APS) array, a first analog-to-digital converter (ADC) and a ramp signal generator. The APS array includes a plurality of pixels arranged in a two-dimensional matrix, wherein the APS array generates a reset signal and an image signal for each selected column of the APS array. The first ADC includes a correlated double sampling (CDS) circuit array comprising CDS circuits that are arranged for each column of the APS array, wherein the first ADC generates a digital code from a signal corresponding to the difference between the reset signal and the image signal which are generated by the CDS circuit using a ramp signal. The ramp signal generator generates the ramp signal, wherein a second ADC receives a feedback of the generated ramp signal and generates a feedback reference code, and wherein the ramp signal generator calibrates the ramp signal based on a comparison using the feedback reference code.
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: March 16, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seog-Heon Ham, Gunhee Han, Dong-Myung Lee
  • Publication number: 20090058841
    Abstract: A plasma display and a method of driving the plasma display. The plasma display includes a plasma display panel including a plurality of discharge cells corresponding to sustain electrodes and scan electrodes. A first transistor is coupled between a first power source and a node coupled to the scan electrodes. A second transistor and a diode are coupled in series between a second power source and the node. The first and second transistors are alternately turned on during a sustain period, and the diode is configured to interrupt a current flowing from the second power source to the node.
    Type: Application
    Filed: February 27, 2008
    Publication date: March 5, 2009
    Inventors: Jin-Woo Jung, Dong-Myung Lee
  • Publication number: 20080246695
    Abstract: In a plasma display and a driving method thereof, a sustain pulse of a high level voltage is supplied to a scan electrode or a sustain electrode during a sustain period using a capacitor charged to a voltage corresponding to a voltage difference between a high scan voltage and a low scan voltage. A low-voltage capacity transistor is connected between a power source and the scan electrode, the power source supplying a high level voltage to the scan electrode. Using the low-voltage capacity transistor results in reduced driving circuit costs and, in addition, the number of times that a transistor supplying the high scan voltage to the scan electrode and a transistor supplying the low scan voltage to the scan electrode is reduced, thereby reducing ElectroMagnetic Interference (EMI).
    Type: Application
    Filed: April 4, 2008
    Publication date: October 9, 2008
    Inventor: Dong-Myung Lee
  • Publication number: 20080111057
    Abstract: A complementary metal oxide semiconductor (CMOS) image sensor includes a photodiode, a switch and a comparator. The switch transfers a sensing signal to a sensing node from the photodiode. The comparator, which is directly connected to the sensing node, compares the sensing signal of the sensing node with a reference signal. The comparator outputs a signal corresponding to a voltage difference between the sensing signal and the reference signal.
    Type: Application
    Filed: October 18, 2007
    Publication date: May 15, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dong-Myung LEE, Dong-Soo KIM, Gun-Hee HAN, Seog-Heon HAM
  • Publication number: 20080111059
    Abstract: A digital double sampling method, a related complementary metal oxide semiconductor (CMOS) image sensor, and a digital camera comprising the CMOS image sensor are disclosed. The method includes generating first digital data corresponding to an initial voltage level apparent in a pixel in response to a reset signal, inverting the first digital data, outputting a detection voltage corresponding to image data received from outside of the CMOS image sensor, and counting in synchronization with a clock signal, starting from an initial value equal to the inverted first digital data, and for an amount of time responsive to a voltage level of the detection voltage.
    Type: Application
    Filed: October 23, 2007
    Publication date: May 15, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dong-Myung LEE, Gun-Hee HAN, Seog-Heon HAM
  • Publication number: 20070080903
    Abstract: A plasma display device includes a PDP, a driver for supplying driving signals to the PDP, and a power supply for supplying a power source to the driver. The power supply includes first and second resistors coupled in series between two terminals for outputting a predetermined output voltage, and a shunt regulator for maintaining a node of the first and second resistors at a constant voltage by coupling a node of the first and second resistors to a reference terminal. At least one of the first and second resistors is a variable resistor of which a resistance is changed by a change of temperature. With such a structure, a low discharge may be prevented when the power supply changes a predetermined voltage used in the plasma display device according to a change of temperature.
    Type: Application
    Filed: September 28, 2006
    Publication date: April 12, 2007
    Inventor: Dong-Myung Lee
  • Publication number: 20070046802
    Abstract: An image sensor comprises an active pixel sensor (APS) array, a first analog-to-digital converter (ADC) and a ramp signal generator. The APS array includes a plurality of pixels arranged in a two-dimensional matrix, wherein the APS array generates a reset signal and an image signal for each selected column of the APS array. The first ADC includes a correlated double sampling (CDS) circuit array comprising CDS circuits that are arranged for each column of the APS array, wherein the first ADC generates a digital code from a signal corresponding to the difference between the reset signal and the image signal which are generated by the CDS circuit using a ramp signal. The ramp signal generator generates the ramp signal, wherein a second ADC receives a feedback of the generated ramp signal and generates a feedback reference code, and wherein the ramp signal generator calibrates the ramp signal based on a comparison using the feedback reference code.
    Type: Application
    Filed: August 23, 2006
    Publication date: March 1, 2007
    Inventors: Seog-Heon Ham, Gunhee Han, Dong-Myung Lee
  • Publication number: 20070040766
    Abstract: In the plasma display device, a voltage of a power recovery capacitor is set to be greater than half of a sustain discharge voltage when a voltage of a power recovery circuit is increased, and is set to be lower than half of the sustain discharge voltage when the voltage of the power recovery circuit is decreased. Accordingly, power recovery efficiency can be improved.
    Type: Application
    Filed: August 14, 2006
    Publication date: February 22, 2007
    Inventor: Dong-Myung Lee
  • Patent number: 6750563
    Abstract: A voltage sag and over-voltage compensation device for an AC electric power distribution system employing cascaded switching devices and a pulse-width modulated transformer. Each stage of the cascaded switching device includes a switching element located within a full-bridge rectifier circuit to allow bi-directional switching through each switching element (i.e., switching through the same switching element during the positive and negative portions of the AC voltage cycle). Each full-bridge rectifier also includes a snubber circuit connected in parallel with a corresponding switching element to absorb the current discharge caused by switching the input power supply to the transformer through the corresponding switching device under non-zero current conditions.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: June 15, 2004
    Assignee: SSI Power LLC
    Inventors: Joseph R. Rostron, Dong-Myung Lee
  • Publication number: 20030111910
    Abstract: A voltage sag and over-voltage compensation device for an AC electric power distribution system employing cascaded switching devices and a pulse-width modulated transformer. Each stage of the cascaded switching device includes a switching element located within a full-bridge rectifier circuit to allow bi-directional switching through each switching element (i.e., switching through the same switching element during the positive and negative portions of the AC voltage cycle). Each full-bridge rectifier also includes a snubber circuit connected in parallel with a corresponding switching element to absorb the current discharge caused by switching the input power supply to the transformer through the corresponding switching device under non-zero current conditions.
    Type: Application
    Filed: December 12, 2002
    Publication date: June 19, 2003
    Inventors: Joseph R. Rostron, Dong-Myung Lee
  • Patent number: 6525497
    Abstract: Disclosed are a phase distortion compensating apparatus and method for reducing a torque ripple in a 3-phase motor using four switching elements, which are capable of adjusting respective switching times of phase voltages, to be supplied to the 3-phase motor by an inverter including the switching elements, based on a voltage difference between upper and lower DC link capacitors respectively adapted to supply voltages to the inverter, thereby reducing a torque ripple generated in the motor.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: February 25, 2003
    Assignee: LG Electronics Inc.
    Inventors: Dong Myung Lee, Jae Yoon Oh, Dal Ho Cheong
  • Patent number: 6448725
    Abstract: An apparatus for detecting a rotor position in a brushless direct current (BLDC) motor, in which a rotor position can be detected by a virtual neutral point voltage and current of one phase in a motor. The number of circuits required for the rotor position detection is reduced to save the production cost and reduce the space occupied by a position detecting circuit.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: September 10, 2002
    Assignee: LG Electronics Inc.
    Inventors: Kwan Yuhl Cho, Dong Myung Lee
  • Patent number: 6388903
    Abstract: Disclosed are a voltage compensating apparatus and method for a 3-phase inverter using four switches, to compensate for a severe distortion of a 3-phase application voltage due to a voltage ripple.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: May 14, 2002
    Assignee: LG Electronics Inc.
    Inventors: Dong Myung Lee, Jae Yoon Oh, Dal Ho Cheong, Soon Bae Yang