Patents by Inventor Chong-Chul Chai

Chong-Chul Chai 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: 9524690
    Abstract: A gate driving circuit includes: a pull-up controller applying a carry signal of one of previous stages to a first node in response to the carry signal of the one of the previous stages; a pull-up part outputting a clock signal as an N-th gate output signal; a carry part outputting the clock signal as an N-th carry signal; a first pull-down part pulling down the signal at the first node to a second off voltage; a second pull-down part pulling down the N-th gate output signal to a first off voltage; an inverting part generating an inverting signal based on the clock signal and the second off voltage to output the inverting signal to an inverting node; and a reset part outputting a reset signal to the inverting node.
    Type: Grant
    Filed: August 15, 2014
    Date of Patent: December 20, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jae-Keun Lim, Ji-Sun Kim, Kyoung-Ju Shin, Chong-Chul Chai, Jong-Hee Kim
  • Patent number: 9524674
    Abstract: A stage circuit includes a first driver, a second driver, a first output unit, a second output unit and a controller. The first driver controls voltages of first and second nodes, according to a first power source, a third power source, a start signal or a carry signal of a previous stage input to a first input terminal, and a clock signal supplied to a second input terminal. The second driver controls voltages of third and fourth nodes, according to voltages of the first power source, the third power source, the first input terminal and the first and second nodes. The first output unit outputs a carry signal to a first output terminal, according to voltages of the first power source, the second input terminal and the third and fourth nodes. The second output unit outputs a scan signal to a second output terminal, according to voltages of the second power source, the second input terminal and the third and fourth nodes. The controller is electrically coupled to the first output terminal and the second driver.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: December 20, 2016
    Assignees: Samsung Display Co., Ltd., Industry-University Cooperation Foundation Hanyang-University
    Inventors: Oh-Kyong Kwon, Yeong-Keun Kwon, Jong-Hee Kim, Ji-Sun Kim, Jae-Keun Lim, Chong-Chul Chai
  • Patent number: 9515647
    Abstract: A gate driver includes a stage including an input unit including a first transistor diode-connected to a first input terminal of the stage through a first node and biased by a first input signal of the first input terminal, an output unit including a second transistor including a gate electrode coupled to the first node, a first electrode coupled to a clock input terminal, and a second electrode coupled to a first output terminal of the stage, a capacitor coupled between the gate electrode and the second electrode of the second transistor, and a noise remover including a third transistor including a gate electrode coupled to a second node, a first electrode coupled to the first node, and a second electrode coupled to a first voltage input terminal of the stage which receives a first voltage.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: December 6, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Jae Keun Lim, Hyun Joon Kim, Cheol-Gon Lee, Chong Chul Chai
  • Patent number: 9501959
    Abstract: A mother substrate includes a display substrate cell defined by a scribe line, the display substrate cell including a plurality of gate lines, a gate circuit part driving the gate lines, and a gate pad part connected to the gate circuit part, a gate test pad part in a peripheral area surrounding the display substrate cell, the gate test pad part being configured to receive a gate test signal, a gate test line part connecting the gate test pad part and the gate pad part, and a switching part connected to the gate test line part and configured to control turning on and turning off of the gate test line part.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: November 22, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Ji-Sun Kim, Chong-Chul Chai, Yeong-Keun Kwon
  • Publication number: 20160321991
    Abstract: An organic light-emitting diode display is disclosed. In one aspect, the display includes a plurality of pixels formed in a plurality of intersection areas of a plurality of data lines and a plurality of scan lines. Each of the pixels includes a storage capacitor configured to store a data voltage, at least one target transistor having one end electrically connected to a current path of the storage capacitor, an organic light emitting layer, and a first electrode of an OLED formed over the organic light emitting layer. The first electrode includes a first electrode extension configured to block at least a portion of the target transistor from light.
    Type: Application
    Filed: October 30, 2015
    Publication date: November 3, 2016
    Inventors: Hee Rim Song, Mu Kyung Jeon, Chong Chul Chai
  • Patent number: 9478169
    Abstract: A pixel, a display device having the same, and a thin film transistor (TFT) substrate for the display device are disclosed. In one aspect, the pixel includes an emitter configured to emit light based at least in part on a driving current. The pixel also includes a driving transistor including an active layer, a first electrode electrically connected to a first end portion of the active layer, a second electrode electrically connected to a second end portion of the active layer, a first gate electrode configured to receive a data voltage from a data driver so as to form a channel in the active layer, and a second gate electrode configured to receive a bias voltage from a voltage source, wherein the channel is configured to adjust the driving current.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: October 25, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jae-Keun Lim, Chong-Chul Chai, Joon-Chul Goh, Mu-Kyung Jeon
  • Patent number: 9479156
    Abstract: A gate driver, including multiple stages of gate driving circuits, wherein each stage of the gate driving circuits includes an input part configured to generate a Q node signal in response to a carry signal of one of previous stages and a clock signal, the Q node signal being applied to Q node, an output part configured to output a gate output signal to a gate output terminal in response to the Q node signal, and a charge sharing part connected to the gate output terminal of a present stage and a gate output terminal of one of next stages, the charge sharing part configured to operate charge-sharing between the gate output signal of the present stage and a gate output signal of one of the next stages in response to a select signal.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: October 25, 2016
    Assignees: Samsung Display Co., Ltd., Industry-University Cooperation Foundation Hanyang University
    Inventors: Oh-Kyong Kwon, Yeong-Keun Kwon, Jong-Hee Kim, Ji-Sun Kim, Jae-Keun Lim, Chong-Chul Chai
  • Publication number: 20160293079
    Abstract: A display device includes: a display panel divided into a first area and a second area; a first scan driver to provide a scan signal to a pixel in the first area through a first scan line coupled to the pixel in the first area; a second scan driver to provide the scan signal to a pixel in the second area through a second scan line coupled to the pixel in the second area; a first scan switching transistor and a second scan switching transistor to couple the first scan line to the second scan line based on the scan signal, the first scan switching transistor and the second scan switching transistor being arranged between the first area and the second area; a data driver to provide data signals; and a timing controller to control the first and second scan drivers and the data driver.
    Type: Application
    Filed: October 13, 2015
    Publication date: October 6, 2016
    Inventors: Ji-Sun Kim, Jae-Keun Lim, Chong-Chul Chai
  • Publication number: 20160293093
    Abstract: A demultiplexer includes: a first transistor connected between a data input terminal and a first output terminal; a second transistor connected between the data input terminal and a second output terminal; and a first pre-charge circuit connected to a gate electrode of the first transistor, the first pre-charge circuit including: a third transistor and a first diode connected between a first clock input terminal and the gate electrode of the first transistor in parallel; and a first capacitor connected between a second clock input terminal and the gate electrode of the first transistor.
    Type: Application
    Filed: November 25, 2015
    Publication date: October 6, 2016
    Inventors: Young Wan Seo, Jong Hee Kim, Ji Sun Kim, Jae Keun Lim, Chong Chul Chai
  • Publication number: 20160293269
    Abstract: There is provided a shift register including a plurality of stages sequentially coupled to an input terminal configured to receive a start pulse, wherein each of the plurality of stages includes a first transistor coupled between a first clock input terminal and an output terminal and having a first gate electrode coupled to a first node, a second transistor coupled between the output terminal and a power input terminal and having a second gate electrode coupled to a second clock input terminal, and a third transistor coupled between the first node and a first input terminal configured to receive the start pulse or an output signal of a previous stage of the stages, the third transistor having a third gate electrode coupled to the second clock input terminal.
    Type: Application
    Filed: December 15, 2015
    Publication date: October 6, 2016
    Inventors: Jae Keun Lim, Jong Hee Kim, Ji Sun Kim, Young Wan Seo, Chong Chul Chai
  • Publication number: 20160293131
    Abstract: A gate driver includes a plurality of stage circuits to output a clock signal from the outside as gate signals. A jth stage circuit includes an input unit to charge a first node at an initial voltage when a first input signal is input to a first input terminal, a buffer unit to output the clock signal as a gate signal to an output terminal when the initial voltage is supplied to the first node, a holding unit to maintain the first node at a reset power source level when the clock signal is supplied to the holding unit, and an inverter unit to supply the clock signal or the reset power source to the holding unit. The input unit maintains the first node at a second input signal input voltage to a second input terminal when a third input signal is input to a third input terminal.
    Type: Application
    Filed: March 29, 2016
    Publication date: October 6, 2016
    Inventors: Jong Hee Kim, Ji Sun Kim, Young Wan Seo, Jae Keun Lim, Chong Chul Chai
  • Patent number: 9449562
    Abstract: A display apparatus includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels. Each pixel of the plurality of pixels comprises a switching device coupled to a corresponding gate line of the plurality of gate lines and to a corresponding data line of the plurality of data lines, a micro-electro-mechanical system coupled to an output electrode of the switching device, and a control device coupled to the output electrode of the switching device. The control device comprises a storage capacitor coupled to the output electrode of the switching device and a coupling capacitor coupled to the output electrode of the switching device, the storage capacitor connected in parallel with the coupling capacitor. The output electrode of the switching device, the storage capacitor, the coupling capacitor, and a first electrode of the micro-electro-mechanical system are all directly connected to each other.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: September 20, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Kyoung-Ju Shin, Chong-Chul Chai, Eun-Ju Kim
  • Patent number: 9443465
    Abstract: A display device includes: a first switching element which transmits a first data voltage; a second switching element which transmits a second data voltage; a driving transistor connected to the first switching element and the second switching element, where the driving transistor is driven based on the first data voltage and the second data voltage; and an organic light emitting diode connected to the driving transistor, where the organic light emitting diode emits light based on an output of the driving transistor, and a driving method thereof.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: September 13, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Se Hyoung Cho, Joon-Chul Goh, Jong-Hee Kim, Cheol-Gon Lee, Jae Keun Lim, Ho Yong Jung, Chong Chul Chai
  • Publication number: 20160246137
    Abstract: A liquid crystal display includes a pixel electrode including a first subpixel electrode and a second subpixel electrode spaced apart with a gap therebetween, a common electrode facing the pixel electrode, and a liquid crystal layer formed between the pixel electrode and the common electrode and including a plurality of liquid crystal molecules. The first and second subpixel electrodes include a plurality of branches, and each of the first and second subpixel electrodes includes a plurality of subregions. The branches extend in different directions in different subregions.
    Type: Application
    Filed: May 4, 2016
    Publication date: August 25, 2016
    Inventors: Mee-Hye JUNG, Ji-Won SOHN, Jae-Jin LYU, Chong-Chul CHAI
  • Publication number: 20160240129
    Abstract: A gate circuit according to an exemplary embodiment of the present inventive concept comprises a plurality of stages, each receiving a clock signal and outputting a gate signal and a carry signal. One of the plurality of stages includes a first transistor of which a first terminal and a control terminal are connected to each other and a carry signal of a stage before previous stage is input to the first terminal and the control terminal and a second transistor of which a gate signal of the previous stage is input to a first terminal, a control terminal is connected with a second terminal of the first transistor, and an output terminal is connected to a first node.
    Type: Application
    Filed: October 22, 2015
    Publication date: August 18, 2016
    Inventors: Jong Hee KIM, Ji-Sun KIM, Jun Hyun PARK, Young Wan SEO, Jae Keun LIM, Chong Chul CHAI
  • Publication number: 20160240128
    Abstract: A coupling compensator for a display panel and a display device including the coupling compensator are disclosed. In one aspect, the coupling compensator includes a memory configured to receive grayscale data and store the grayscale data and a first data converter configured to convert the grayscale data to a plurality of grayscale data voltages including first and second grayscale data voltages. The compensator also includes a coupling voltage calculator configured to calculate a line coupling voltage generated on a data line based on the difference between the first grayscale data voltage corresponding to the grayscale data provided to a first group of the pixels in an (N?1)th row and the second grayscale data voltage corresponding to the grayscale data provided to a first group of the pixels in an Nth row, where the N is an integer equal to or greater than 2.
    Type: Application
    Filed: July 31, 2015
    Publication date: August 18, 2016
    Inventors: Jong-Hee Kim, Jae-Keun Lim, Ji-Sun Kim, Young-Wan Seo, Chong-Chul Chai
  • Publication number: 20160217744
    Abstract: An organic light emitting display device includes a plurality of pixel columns, a first data wiring, a second data wiring, and a power supply wiring. The pixel columns include pixels repeatedly arranged in a first direction, and the pixel columns are repeatedly arranged in a second direction. The first and second directions are substantially perpendicular to each other. The first data wiring extends in the first direction and is connected to the pixels in an even row. The second data wiring extends in the first direction and are connected to the pixels in an odd row. The power supply wiring extends in the first direction between the first and second data wirings.
    Type: Application
    Filed: July 1, 2015
    Publication date: July 28, 2016
    Inventors: Hee-Rim SONG, Yong-Koo HER, Mu-Kyung JEON, Jong-Hee KIM, Chong-Chul CHAI
  • Patent number: 9401122
    Abstract: A display panel includes a display area including a gate line and a data line, a gate driver integrated on a substrate and connected to one end of the gate line, the gate driver including a plurality of a stage, a signal line connected to the stages; and a blocking member disposed on the signal line and overlapped with the signal line, the blocking member including a plurality of an opening.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: July 26, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Young-Eun Jo, Kyoung-Ju Shin, Chong-Chul Chai
  • Publication number: 20160203794
    Abstract: A display device includes: a display unit including a plurality of pixels, each of the pixels including: an OLED; and a driving transistor to supply current to an anode of the OLED according to a voltage applied to a gate of the driving transistor and a power supply voltage; a scan driver to supply scan signals to the pixels; an initialization driver to supply initializing signals to the pixels; a data driver to supply data signals to the pixels; light emission drivers to supply first and second light emission signals to the pixels; and a power supply to supply the power supply voltage and an initialization voltage to the pixels, wherein the initialization voltage is supplied to the anode during a first period, and the power supply voltage corresponding to a threshold voltage of the driving transistor is supplied to the gate during a first sub-period of the first period.
    Type: Application
    Filed: January 8, 2016
    Publication date: July 14, 2016
    Inventors: Jae Keun Lim, Jong Hee Kim, Chong Chul Chai
  • Patent number: 9360717
    Abstract: A liquid crystal display includes a pixel electrode including a first subpixel electrode and a second subpixel electrode spaced apart with a gap therebetween, a common electrode facing the pixel electrode, and a liquid crystal layer formed between the pixel electrode and the common electrode and including a plurality of liquid crystal molecules. The first and second subpixel electrodes include a plurality of branches, and each of the first and second subpixel electrodes includes a plurality of subregions. The branches extend in different directions in different subregions.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: June 7, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Mee-Hye Jung, Ji-Won Sohn, Jae-Jin Lyu, Chong-Chul Chai