Patents by Inventor Hoon-Ju Chung

Hoon-Ju 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).

  • Patent number: 8477084
    Abstract: An organic electroluminescence display has data, gate, and signal lines arranged on a substrate. Pixel regions are defined by the gate and signal lines. Switching elements provided in the pixel regions are electrically connected to the signal lines and the gate lines. Switching blocks open and close an electrical connection between the signal lines and the pixels. A driving unit drives the switching elements by supplying scanning signals to the gate lines. The driving unit also supplies a first control signal before the scanning signals are supplied and a second control signal when the scanning signals are supplied. The second control signal makes the switching blocks sequentially conductive, during which time image signals are supplied to the data lines. The first control signal permits the signal lines to be set at a predetermined voltage.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: July 2, 2013
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon Ju Chung, Chang Hoon Jeon
  • Patent number: 8330683
    Abstract: A driving method of a flat panel display includes dividing one frame into a plurality of sub-frames, wherein each sub-frame includes an on-state time, each on-state time corresponds to a weight value, and at least one of the weight values is expressed in the form of a non-binary code; applying an on-state gate signal to a pixel in each sub-frame to turn on the pixel; and applying each bit of a data signal corresponding to each sub-frame to the pixel.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: December 11, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon-Ju Chung, Chang-Hoon Jeon
  • Patent number: 8199073
    Abstract: An electro-luminescence display device for reducing the number of output channels of a data driver is disclosed. An electro-luminescence (EL) display device according to the present invention includes an EL display panel having a plurality of pixels; m data electrode lines (wherein m is an integer) and a plurality of scan electrode lines in the EL display panel, the data electrode lines and the scan electrode lines defining the pixels; a data driver having a plurality of output channels for supplying data signals to the m data electrode lines; and a multiplexer for connecting each output channel of the data driver to k data electrode lines (wherein k is an integer greater than 2).
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: June 12, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon Ju Chung, Jae Ho Sim
  • Patent number: 8125473
    Abstract: An electro-luminescence display device and a method of driving the same for controlling a full white brightness depending upon a brightness of the external environment and thus controlling a brightness mode is disclosed. An electro-luminescence display device according to the present invention comprising: a display panel having pixels light-emitted by a supplied current; a data driver for applying a data voltage corresponding to said current to the pixels; and a timing controller for dividing one frame into a plurality of sub-frames and applying said data voltage corresponding to each of the plurality of sub-frames to the data driver and for controlling an emission time of each frame.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: February 28, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon Ju Chung, Chang Hoon Jeon
  • Patent number: 8035580
    Abstract: An electro-luminescence display panel and a driving method thereof for preventing a life shortening of the EL caused by a direct current are disclosed. In the electro-luminescence display panel implementing a gray level by a combination of light-emitting periods of sub-frames corresponding to each bit of video data, each of pixels includes an electro-luminescence (EL) cell, and a cell driver for allowing a forward current to be flown into the EL cell in accordance with a supplied data signal in a light-emitting period of the sub-frame while allowing a backward bias to be applied to the EL cell in a non-light-emitting period of the sub-frame.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: October 11, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon Ju Chung, Chang Hoon Jeon
  • Patent number: 7973466
    Abstract: An organic electroluminescent display device includes: a substrate having a pixel region and a non-pixel region surrounding the pixel region; a first electrode on the substrate in the pixel region; an organic luminescent layer on the first electrode; a second electrode on the organic luminescent layer; and a light-shielding means corresponding to the non-pixel region.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: July 5, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Du-Hwan Oh, Hoon-Ju Chung, Byeong-Koo Kim, Yong-Min Ha
  • Patent number: 7907104
    Abstract: A luminescent display device and a method for driving the same are disclosed which are capable of increasing the aspect ratio of pixel regions.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: March 15, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Du Hwan Oh, Young Ju Park, Hoon Ju Chung
  • Patent number: 7750875
    Abstract: An organic light-emitting diode display device includes a first switch element turned-on in response to a first scanning signal during a first period to supply a data to a first node, and then maintaining an off-state during a second period, a driving device adjusting a current through an organic light-emitting diode element in accordance with a voltage of the first node; a reference voltage source providing a reference voltage that is capable of turning-off the driving device, a second switch element maintaining an off-state during the first period, and turned-on during the second period to supply the reference voltage to the first node, and a storage capacitor maintaining the voltage at the first node.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: July 6, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: O Hyun Kim, Hoon Ju Chung, Myoung Hoon Jung
  • Patent number: 7724218
    Abstract: An organic light-emitting diode display device and driving method thereof are provided. The organic light-emitting diode display device including a driving voltage source; a reference voltage source that generates a reference voltage; a reference current source; and a storage capacitor connected between a first node and a second node. An organic light-emitting diode device is connected between a third node and a ground voltage source. A first scanning signal is supplied to a first scan line. A second scanning signal is supplied to a second scan line, the second scanning signal having an inverse-phase against the first scanning signal.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: May 25, 2010
    Assignee: LG. Display Co., Ltd.
    Inventors: O Hyun Kim, Hoon Ju Chung, Myoung Hoon Jung
  • Patent number: 7656369
    Abstract: A driving apparatus for an organic light-emitting diode includes an organic light-emitting diode, a driving switch that drives the organic light-emitting diode in response to a control voltage applied to a gate terminal of the driving switch, a high-level voltage source that supplies a high-level voltage to the driving switch, a data driving circuit that supplies a data voltage to a data line of the driving apparatus, a reference voltage source that supplies a reference voltage to the driving apparatus, and a capacitor that applies the control voltage to the gate terminal of the driving switch, the control voltage being a difference between the data voltage and the reference voltage.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: February 2, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon Ju Chung, Jae Ho Sim, Jung Chul Kim
  • Publication number: 20090207107
    Abstract: An electro-luminescence display device and a method of driving the same for controlling a full white brightness depending upon a brightness of the external environment and thus controlling a brightness mode is disclosed. An electro-luminescence display device according to the present invention comprising: a display panel having pixels light-emitted by a supplied current; a data driver for applying a data voltage corresponding to said current to the pixels; and a timing controller for dividing one frame into a plurality of sub-frames and applying said data voltage corresponding to each of the plurality of sub-frames to the data driver and for controlling an emission time of each frame.
    Type: Application
    Filed: April 24, 2009
    Publication date: August 20, 2009
    Inventors: Hoon Ju Chung, Chang Hoon Jeon
  • Patent number: 7538749
    Abstract: An electro-luminescence display device and a method of driving the same for controlling a full white brightness depending upon a brightness of the external environment and thus controlling a brightness mode is disclosed. An electro-luminescence display device according to the present invention comprising: a display panel having pixels light-emitted by a supplied current; a data driver for applying a data voltage corresponding to said current to the pixels; and a timing controller for dividing one frame into a plurality of sub-frames and applying said data voltage corresponding to each of the plurality of sub-frames to the data driver and for controlling an emission time of each frame.
    Type: Grant
    Filed: December 28, 2004
    Date of Patent: May 26, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Hoon Ju Chung, Chang Hoon Jeon
  • Patent number: 7508037
    Abstract: A method for fabricating a poly-silicon liquid crystal display device includes forming a poly-silicon layer including a TFT region and a storage capacitor region on a substrate, wherein the capacitor region includes an impurity injection region having a N-type impurity injection region and a P-type impurity injection region; forming a gate electrode and a storage capacitor electrode on the poly-silicon layer; injecting an N-type impurity ion with a high doping density into the N-type impurity injection region and the TFT region; injecting a P-type impurity ion with a high doping density into the P-type impurity injection region; forming an insulating layer on the gate electrode and the storage electrode; and forming a pixel electrode on the insulating layer, wherein the pixel electrode is electrically connected to the impurity injection region in the storage capacitor region.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: March 24, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: San-Ho Kim, Hoon-Ju Chung
  • Patent number: 7486027
    Abstract: An organic light emitting diode display device comprising a display panel, a plurality of light emitting diodes arranged on the display panel and having an optical amount varied according to a current amount, a sample/hold unit for supplying a current to the light emitting diodes, a D/A converter for controlling a current amount supplied to the light emitting diodes from the sample/hold unit by controlling a current amount supplied from the sample/hold unit according to image information, and a voltage controller for conducting or shielding a current between the D/A converter and the sample/hold unit by outputting a second bias voltage of which loss voltage has been compensated according to a characteristic of a transistor provided at the D/A converter to the D/A converter by receiving a first bias voltage.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: February 3, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Chang Hwan Lee, Hoon Ju Chung
  • Patent number: 7486261
    Abstract: An electro-luminescence display device includes an electro-luminescence display panel having pixel cells arranged at intersections of a plurality of data electrode lines and a plurality of scan electrode lines, the scan electrode lines being in a unit of at least two electrode lines, and each of the pixel cells along a same row being connected to at least one scan electrode line of a corresponding scan electrode line unit, and a multiplexer for selectively applying data signals to at least two of the data electrode lines during a time period.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: February 3, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Du Hwan Oh, Hoon Ju Chung
  • Patent number: 7319446
    Abstract: An organic electroluminescent display device includes a gate line receiving a gate signal, a data line crossing the gate line, the data line receiving a data signal, a switching thin film transistor switching the data signal according to the gate signal, a driving thin film transistor connected to the switching thin film transistor and receiving the data signal, a power line supplying a current to the driving thin film transistor, an organic electroluminescent diode connected to the driving thin film transistor, and a pre-charge element inputting a pre-charge voltage to the data line before the data line receives the data signal.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: January 15, 2008
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Du-Hwan Oh, Hoon-Ju Chung
  • Publication number: 20070296672
    Abstract: An organic light-emitting diode display device includes a first switch element turned-on in response to a first scanning signal during a first period to supply a data to a first node, and then maintaining an off-state during a second period, a driving device adjusting a current through an organic light-emitting diode element in accordance with a voltage of the first node; a reference voltage source providing a reference voltage that is capable of turning-off the driving device, a second switch element maintaining an off-state during the first period, and turned-on during the second period to supply the reference voltage to the first node, and a storage capacitor maintaining the voltage at the first node.
    Type: Application
    Filed: December 26, 2006
    Publication date: December 27, 2007
    Applicant: LG.PHILIPS LCD CO., LTD.
    Inventors: O Hyun Kim, Hoon Ju Chung, Myoung Hoon Jung
  • Publication number: 20070279337
    Abstract: An organic light-emitting diode display device and driving method thereof are provided. The organic light-emitting diode display device including a driving voltage source; a reference voltage source that generates a reference voltage; a reference current source; and a storage capacitor connected between a first node and a second node. An organic light-emitting diode device is connected between a third node and a ground voltage source. A first scanning signal is supplied to a first scan line. A second scanning signal is supplied to a second scan line, the second scanning signal having an inverse-phase against the first scanning signal.
    Type: Application
    Filed: December 6, 2006
    Publication date: December 6, 2007
    Inventors: O Hyun Kim, Hoon Ju Chung, Myoung Hoon Jung
  • Patent number: 7262751
    Abstract: An organic electroluminescent display device includes a scan line, a data line, a voltage supply line, a switching transistor connected to the scan and data lines, a driving transistor connected to the switching transistor and the voltage supply line, a storage capacitor connected between the switching transistor and the voltage supply line, and an organic light-emitting diode connected to the driving transistor and ground. A black display voltage applied to the data line is supplied to the driving transistor when a first gate ON signal is applied to the scan line. A video data voltage applied to the data line is supplied to the driving transistor when a second gate ON signal is applied to the scan line. The voltages are applied at least once each frame.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: August 28, 2007
    Assignee: LG. Philips LCD Co., Ltd.
    Inventors: Hoon-Ju Chung, Jae-Ho Sim
  • Patent number: 7221096
    Abstract: An active matrix organic light emitting display panel includes a first substrate including a seal pattern region, a non-display region, and a display region, the non-display region being between the display region and the seal pattern region, a pad connected to the first substrate, and a power line including a routing line connected directly to the pad, and a pixel line for applying a pixel voltage to a plurality of pixels, the routing line having a first portion being in the non-display region and a second portion being in the seal pattern region, and the pixel line being in the display region.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: May 22, 2007
    Assignee: LG.Philips LCD Co., Ltd
    Inventors: Du Hwan Oh, Hoon Ju Chung