Patents by Inventor Yong Chung

Yong Chung 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: 20110199357
    Abstract: An organic light emitting display device includes a scan driver, a data driver, and pixels. The scan driver is for sequentially supplying, during each horizontal period of a width 1H, a scan signal with a width of at least 2H to scan lines. The scan driver is further for sequentially supplying an emission control signal to emission control lines that are substantially parallel to the scan lines. The data driver supplies data signals to data lines. Each pixel includes an organic light emitting diode (OLED), a pixel circuit having a first transistor for controlling the amount of current supplied to the OLED, and a compensator for controlling the voltage of a gate electrode of the first transistor for compensating a degradation of the OLED. The compensator includes two transistors and a capacitor. One transistor is coupled to a scan line, and the other is coupled to an emission control line.
    Type: Application
    Filed: September 22, 2010
    Publication date: August 18, 2011
    Inventors: Bo-Yong Chung, Yong-Sung Park
  • Publication number: 20110193850
    Abstract: There is provided an organic light emitting display device for providing a compensation period of a threshold voltage. The organic light emitting display device includes: a scan driver configured to supply a plurality of scan signals to a plurality of scan lines, each of the scan signals having a width greater than two horizontal periods; a data driver configured to supply a plurality of data signals to a plurality of data lines; and a pixel including an organic light emitting diode, a pixel circuit having a first transistor for controlling an amount of current supplied to the organic light emitting diode, and a compensation circuit configured to control a voltage of a gate electrode of the first transistor to compensate for deterioration of the organic light emitting diode; wherein the scan driver is configured to supply a current scan signal which partially overlaps in time with a previous scan signal.
    Type: Application
    Filed: August 31, 2010
    Publication date: August 11, 2011
    Inventors: Bo-Yong Chung, Yong-Sung Park
  • Patent number: 7995386
    Abstract: Systems, methods, and devices that facilitate applying a predefined negative gate voltage to wordlines adjacent to a selected wordline associated with a memory cell selected during a read or verify operation to facilitate reducing adjacent wordline disturb are presented. A memory component can comprise an optimized operation component that can apply a predefined negative gate voltage to wordlines adjacent to a selected wordline associated with a memory cell selected for a read or verify operation, based at least in part on predefined operation criteria, to facilitate reducing adjacent wordline disturb in the selected memory cell to facilitate reducing a shift in the voltage threshold and maintain a desired operation window. The optimized operation component optionally can include an evaluator component that can facilitate determining whether a negative gate voltage applied to adjacent wordlines is to be adjusted to facilitate reducing adjacent wordline disturb below a predetermined threshold amount.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: August 9, 2011
    Assignee: Spansion LLC
    Inventors: Yuji Mizuguchi, Mark W. Randolph, Darlene Gay Hamilton, Yi He, Zhizheng Liu, Yanxia (Emma) Lin, Xianmin Yi, Gulzar Kathawala, Amol Ramesh Joshi, Kuo-Tung Chang, Edward Franklin Runnion, Sung-Chul Lee, Sung-Yong Chung, Yanxiang Liu, Yu Sun
  • Publication number: 20110187691
    Abstract: A scan driver and a flat panel display apparatus including the scan driver. The scan driver includes a plurality of scan stages, wherein two transistors are coupled between each scan stage such that the scan driver is capable of performing progressive scanning or interlaced scanning.
    Type: Application
    Filed: August 30, 2010
    Publication date: August 4, 2011
    Inventor: Bo-Yong Chung
  • Patent number: 7986562
    Abstract: A system and methodology that can minimize disturbance during an AC operation associated with a memory, such as, program, read and/or erase, is provided. The system pre-charges all or a desired subset of the bit lines in a memory array to a specified voltage, during an AC operation to facilitate reducing AC disturbances between neighboring cells. A pre-charge voltage can be applied to all bit lines in a block in the memory array, or to bit lines associated with a selected memory cell and neighbor memory cells adjacent to the selected memory cell in the block. The system ensures that source and drain voltage levels can be set to desired levels at the same or substantially the same time, while selecting a memory cell. This can facilitate minimizing AC disturbances in the selected memory cell during the AC operation.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: July 26, 2011
    Assignee: Spansion LLC
    Inventors: Sung-Yong Chung, Zhizheng Liu, Yugi Mizuguchi, Xuguang Alan Wang, Yi He, Ming Kwan, Darlene Hamilton, Sung-Chul Lee, Guowei Wang, Nancy Leong
  • Patent number: 7982699
    Abstract: An emission driver may include a first signal processor adapted to receive a clock signal, an input signal and an inverse input signal, and to generate a first output signal, a second signal processor adapted to receive the first output signal, an inverse clock signal and negative feedback signals, and to generate a second output signal, a third signal processor adapted to receive the second output signal and the input signal, and to generate a third output signal that is an inverse of the second output signal, a fourth signal processor adapted to receive the third output signal, and to generate a fourth output signal that is an inverse of the third output signal, and a fifth signal processor adapted to receive the fourth output signal, and to output a fifth output signal that is an inverse of the fourth output signal, wherein the negative feedback signals include the fourth and fifth output signals.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: July 19, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Bo Yong Chung
  • Patent number: 7978160
    Abstract: An emission driver may include a first signal processor adapted to receive a clock signal, an input signal and an inverse input signal, and to generate a first output signal, a second signal processor adapted to receive the first output signal, an inverse clock signal and negative feedback signals, and to generate a second output signal, a third signal processor adapted to receive the second output signal and the input signal, and to generate a third output signal that is an inverse signal to the second output signal, and a fourth signal processor adapted to receive the third output signal, and to generate a fourth output signal that is an inverse of the third output signal based on the third output signal, wherein the negative feedback signals include the third output signal and the fourth output signal.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: July 12, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Bo Yong Chung
  • Publication number: 20110164071
    Abstract: A pixel circuit includes a light emitting device, an N-type driving transistor for outputting a driving current according to a voltage applied to the gate electrode, a first capacitor coupled to a gate electrode of the driving transistor, a second capacitor including a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the light emitting device, and second through sixth N-type transistors. An initialization period is reduced for a driving operation and the threshold voltage compensation time of a driving transistor is controlled.
    Type: Application
    Filed: September 23, 2010
    Publication date: July 7, 2011
    Inventors: Bo-Yong Chung, Yong-Sung Park
  • Publication number: 20110164016
    Abstract: A pixel circuit includes: an OLED; a second transistor including gate, first, and second terminals coupled to a first scan line, a data line, and a first node, respectively; a fourth transistor including gate, first, and second terminals coupled to a third scan line, the first node, and a second node, respectively; a third transistor including gate, first, and second terminals coupled to a second scan line, a reference power source, and the second node, respectively; a fifth transistor including gate, first, and second terminals coupled to a light emission control line, a third node, and an anode of the OLED, respectively; a first capacitor coupled between the first and second nodes; a second capacitor coupled between the second and third nodes; and a first transistor including gate, first, and second terminals coupled to the first node, a first power source, and the third node, respectively.
    Type: Application
    Filed: August 26, 2010
    Publication date: July 7, 2011
    Inventors: Chul-Kyu Kang, Bo-Yong Chung
  • Publication number: 20110157126
    Abstract: A pixel circuit and an organic light emitting diode (OLED) display device using the same are provided. The pixel circuit compensates for a threshold voltage of a driver transistor and for a voltage drop, and separately drives an initialization time to improve a contrast ratio. The pixel circuit further suppresses a leakage current caused by a data voltage using a fixed power source so that current variation caused by the leakage current can be reduced or minimized to improve crosstalk, and the duty of an emission control signal can be adjusted to remove motion blur. The pixel circuit also compensates for a leakage current generated in a turn-off state of a transistor with an increase in a drain-source voltage.
    Type: Application
    Filed: September 8, 2010
    Publication date: June 30, 2011
    Inventors: Bo-Yong Chung, Yong-Sung Park, Deok-Young Choi
  • Publication number: 20110157144
    Abstract: A pixel of a display with reduced leakage current is disclosed. The pixel includes: an organic light emitting diode; a first transistor for controlling an amount of current flowing from a first power source to a second power source via the organic light emitting diode; a storage capacitor coupled between the first power source and a gate electrode of the first transistor; a plurality of third transistors coupled between the gate electrode and a second electrode of the first transistor; and a plurality of fourth transistors coupled between the gate electrode of the first transistor and an initialization power source. The third and fourth transistors are configured to reduce a leakage current from the storage capacitor to improve the image quality of the display.
    Type: Application
    Filed: September 21, 2010
    Publication date: June 30, 2011
    Inventors: Yong-Sung Park, Bo-Yong Chung, Deok-Young Choi
  • Publication number: 20110134100
    Abstract: An organic electro-luminescent display apparatus can compensate for the threshold voltage and voltage drop of the driving transistor. The organic electro-luminescent display apparatus divides and drives an initialization time, thereby improving a contrast ratio. The organic electro-luminescent display apparatus minimizes or reduces the change of a current due to a leakage current by correcting the leakage current corresponding to a data voltage with a fixed power source, thereby improving crosstalk. The organic electro-luminescent display apparatus adjusts the duty of the emission control signal, thereby removing or reducing motion blur.
    Type: Application
    Filed: August 30, 2010
    Publication date: June 9, 2011
    Inventors: Bo-Yong Chung, Yong-Sung Park, Deok-Young Choi
  • Publication number: 20110134300
    Abstract: A mobile terminal having an image projector and controlling method therein are disclosed, by which a detachable image projector can be provided to the mobile terminal and by which a projection mode of a detachable image projector can be conveniently changed. The present invention includes a housing, a touchscreen provided to one surface of the housing to recognize a touch input of a user, a detachable projector module having an activation switch provided to one lateral side, the detachable projector module configured to project a prescribed image on an external surface, and a controller controlling an activation message for receiving an confirmation of a presence or non-presence of activation of the projector module from the user to be displayed on the touchscreen if the activation switch is manipulated. In this case, the detachable projector module is attached to a prescribed surface of the housing except the one surface of the housing to which the touchscreen is provided.
    Type: Application
    Filed: November 24, 2010
    Publication date: June 9, 2011
    Inventor: Deok Yong CHUNG
  • Patent number: 7952938
    Abstract: A memory device comprising an optimization component that facilitates erasing memory cells in a substantially homogeneous electromagnetic field and methods that facilitate erasing memory cells in a substantially homogeneous electromagnetic field are presented. The optimization component facilitates selecting a subset of memory cells to be erased at the same time, such that a memory cell in the subset of memory cells has two neighbor memory cells adjacent thereto that are in the subset of memory, or one neighbor memory cell adjacent thereto when the memory cell is an end-row memory cell. The optimization component facilitates performing a Fowler-Nordheim channel erase to erase the subset of memory cells, and a predetermined voltage potential associated with an erase command is applied to each cell of the subset of memory cells to facilitate reducing fringing effect associated with the electromagnetic fields applied to the cells during the erase.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: May 31, 2011
    Assignee: Spansion LLC
    Inventors: Gulzar Ahmed Kathawala, Wei Zheng, Zhizheng Liu, Sung-Yong Chung, Timothy Thurgate, Kuo-Tung Chang, Sheung-Hee Park, Gabrielle Wing Han Leung
  • Patent number: 7944418
    Abstract: A data driving circuit for a light emitting display may include a gamma voltage generator that generates gradation voltages, a current sink that receives a predetermined current from a pixel via a data line during a first partial period of one complete period for driving the pixel, a voltage generator that generates an incrementally increasing compare voltage during the first partial period, a comparator that compares a compensation voltage generated based on the predetermined current with the compare voltage and generates a logic signal based on a result of the compare, an adjusting unit that generates compensation data based on the logic signal, and a digital-analog converter that generates a composite data using the compensation data and externally supplied data and selects, as a data signal for the pixel, one of the plurality of gradation voltages based on a bit value of the composite data.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: May 17, 2011
    Assignees: Samsung Mobile Display Co., Ltd., IUCF-HYU—Hanyang University
    Inventors: Bo Yong Chung, Do Hyung Ryu, Hong Kwon Kim, Oh Kyong Kwon
  • Patent number: 7936322
    Abstract: A pixel configured to compensate for a threshold voltage of a driving transistor and including an organic light emitting diode coupled between a first power supply and a second power supply; a first transistor coupled between the organic light emitting diode and the second power supply and having a gate electrode coupled to a first node; a second transistor coupled between the first transistor and a data line and having a gate electrode coupled to a scan line; a third transistor coupled between the first transistor and the first node and having a gate electrode coupled to the scan line; a fourth transistor coupled between the first transistor and the second power supply and having a gate electrode coupled to an emission control line; and a fifth transistor coupled between the organic light emitting diode and the first transistor and having a gate electrode coupled to the emission control line.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: May 3, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Bo-Yong Chung, Keum-Nam Kim
  • Publication number: 20110084947
    Abstract: Pixel circuits and an organic electroluminescent display including the same are provided. The pixel circuit includes: an organic light emitting diode; a fifth transistor coupled to a third scan line, a reference power source, and a first node; a first capacitor coupled between the first node and a second node; a second capacitor coupled between the first node and the organic light emitting diode; a fourth transistor coupled to a second scan line, a data line, and the first node; a sixth transistor coupled to a first scan line, a first power source, and the second node; a second transistor coupled to the second scan line, the second node, and a third node; a third transistor coupled to an emission control line, the first power source, and the third node; and a first transistor coupled to the second node, the third node, and the organic light emitting diode.
    Type: Application
    Filed: July 8, 2010
    Publication date: April 14, 2011
    Inventors: Bo-Yong Chung, Keum-Nam Kim
  • Patent number: 7920109
    Abstract: A system on panel (SOP)-type emission driving device of an organic light emitting display device. The emission driving device includes an odd emission control line controller having a plurality of flip-flops for outputting emission control signals to odd emission control lines, and an even line controller having a plurality of flip-flops for outputting emission control signals to even emission control lines. Each of the flip-flops alternately receives a clock signal and an inverted clock signal for causing the flip-flip to output an emission control signal. In one embodiment, each flip-flop includes nine PMOS transistors and two capacitors.
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: April 5, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventor: Bo-Yong Chung
  • Publication number: 20110074757
    Abstract: A pixel circuit for an organic light emitting display includes: a fourth NMOS transistor including a gate electrode coupled to a first scan line, and a first electrode coupled to a first node; a storage capacitor coupled between the first node and a second node; a third NMOS transistor including a gate electrode coupled to a second scan line, and a first electrode coupled to a data line; a second NMOS transistor including a first electrode coupled to a second electrode of the third NMOS transistor, and a gate electrode and a second electrode coupled to the first node; a fifth NMOS transistor including a gate electrode coupled to an emission control line, and a first electrode coupled to a first power source; an organic light emitting diode (OLED) comprising an anode coupled to the second node; and a first NMOS transistor for providing a driving current to the OLED.
    Type: Application
    Filed: July 7, 2010
    Publication date: March 31, 2011
    Inventors: Bo-Yong Chung, Keum-Nam Kim
  • Patent number: 7916102
    Abstract: A pixel includes: an organic light emitting diode coupled between a first power supply and a second power supply; a first transistor coupled between the organic light emitting diode and the second power supply; a second transistor coupled to a first node to which a gate electrode of the first transistor is coupled; a first capacitor coupled between the first node and a second node; a third transistor coupled between the second node and a data line; a fourth transistor coupled between the first node and the second node; a fifth transistor coupled between the first transistor and the second power supply; and a second capacitor coupled between the second node and a third node between the first transistor and the fifth transistor.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: March 29, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Bo-Yong Chung, Chul-Kyu Kang