Patents by Inventor Hyun Sik Hwang

Hyun Sik Hwang 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: 8970474
    Abstract: A method for driving an electrophoresis display device includes applying a reset voltage having a first polarity to electrophoresis material of the display device for at least one frame period to display a reset image, applying a first gradation voltage having a second polarity opposite to the first polarity to the electrophoresis material for one frame period to display a first grey image after the reset image is displayed, applying a second gradation voltage having the second polarity to the electrophoresis material corresponding to at least one pixel region of the display device for at least two frame periods to display a second grey image, after the first grey image is displayed; and applying a third gradation voltage having the first polarity to the electrophoresis material corresponding to at least one pixel region for one frame period to display a third grey image, after the second grey image is displayed.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: March 3, 2015
    Assignee: Samsung Display Co., Ltd.
    Inventors: KyoungHo Lim, Cheolwoo Park, Uk chul Choi, JongHee Kim, Hyun Sik Hwang
  • Publication number: 20150029170
    Abstract: A method of driving a display panel is disclosed. In one aspect, the display panel includes a plurality of pixels, each of the pixels including a first transistor connected to a first gate line and a pixel electrode and a second transistor connected to a second gate line and the pixel electrode. The method including alternately providing the first gate line with a gate signal and a reverse bias signal and alternately providing the second gate line with the gate signal when the first gate line is provided with the reverse bias signal and the reverse bias signal when the first gate line is provided with the gate signal.
    Type: Application
    Filed: January 22, 2014
    Publication date: January 29, 2015
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Dong-Hwa Shin, Joon-Chul Goh, Won-Sik Oh, Hyun-Sik Hwang, Bong-Hyun You
  • Publication number: 20140313181
    Abstract: A controller controls the driving frequency and voltages for a display device. If image data corresponds to a moving picture, the controller drives a data driver and a gate driver at a moving picture frequency. If image data corresponds to a still image, drives the data driver and the gate driver at a still image frequency lower frequency than the moving picture frequency. When the still image is to be displayed, the signal controller also controls leakage current of a thin film transistor of a pixel based on a representative value of the image data, such that positive leakage current applied for a positive data voltage is equal to negative leakage current applied for a negative data voltage.
    Type: Application
    Filed: January 3, 2014
    Publication date: October 23, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Seok Ha HONG, Dae-Gwang JANG, Byung Sun KIM, Sang Mi KIM, Ung Gyu MIN, Hyun Sik HWANG, Gi Geun KIM, Kyoung Won LEE
  • Publication number: 20140313236
    Abstract: A display device configured to consume less power is disclosed. In one aspect, the display device includes a display panel comprising a pixel connected to a gate line and a data line, a data driver connected to the data line to apply a data voltage, and a gate driver connected to the gate line to sequentially apply a gate-on voltage. The display device additionally includes a signal controller configured to determine image data as corresponding to one of a motion picture, a still image, and a text screen. Furthermore, the signal controller is configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture, a still image frequency lower than the motion picture frequency for displaying the still image, and an ultra-low frequency of about 10 Hz or less for displaying the text screen.
    Type: Application
    Filed: January 30, 2014
    Publication date: October 23, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Dae-Gwang Jang, Hyun Sik Hwang, Gi Geun Kim
  • Publication number: 20140160182
    Abstract: A display device includes a display panel including a gate line, a data line, and a pixel connected to the gate line and the data line, a data driver connected to the data line, a gate driver connected to the gate line, and a signal controller controlling the data driver and the gate driver, wherein a circuits powering power source voltage that is normally used for driving the data driver is selectively not applied during a new-image blanking time when the signal controller is not supplying image data to the data driver.
    Type: Application
    Filed: July 11, 2013
    Publication date: June 12, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventors: Seok Ha HONG, Dae-Gwang JANG, Sang Mi KIM, Ung Gyu MIN, Ji Myoung SEO, Bong Hyun YOU, Hyun Sik HWANG, Gi Geun KIM, Jong Hee KIM, Kyoung Won LEE
  • Publication number: 20140085276
    Abstract: A driving method of a display device includes: determining each of a plurality of pixel rows of the display device as one of a motion picture display pixel row and a still image display pixel row by comparing image data of each of the pixel rows in a current frame and in a previous frame; and driving the motion picture display pixel row with a motion picture frequency and driving the still image display pixel row with a still image display frequency, which is lower than or equal to the motion picture frequency, where a plurality of still image display pixel rows are driven with at least two still image display frequencies.
    Type: Application
    Filed: July 24, 2013
    Publication date: March 27, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventors: Dae-Gwang JANG, Ung Gyu MIN, Seok Ha HONG, Hyun Sik HWANG, Byung Sun KIM, Sang Mi KIM, Bong Hyun YOU, Ji Myoung SEO
  • Publication number: 20140015821
    Abstract: A display panel driving apparatus includes a first switching element and a second switching element. The first switching element applies first pixel data to a first pixel connected with a first data line of a display panel during a first sub frame period. The first switching element is connected with a data channel of a data driving part. The second switching element applies second pixel data having a level higher than a level of the first pixel data to a second pixel connected with a second data line of the display panel during a second sub frame period. The second switching element is connected with the data channel. Thus, display quality of a display apparatus may be enhanced.
    Type: Application
    Filed: November 16, 2012
    Publication date: January 16, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hyun-Sik HWANG, Dae-Gwang Jang, Byung-Sun Kim, Sang-Mi Kim, Ji-Myoung Seo, Seok-Ha Hong
  • Publication number: 20130257914
    Abstract: A display device includes a display capacitor, a data switching device, and a reset switching device. The data switching device may transmit a data voltage to the display capacitor in response to an activating gate signal that is applied to the data switching device for a activating gate signal duration. The reset switching device may transmit a storage voltage to the display capacitor in response to an activating reset signal that is applied to the first reset switching device for an activating reset signal duration. The storage voltage is configured for resetting a pixel associated with the first display capacitor. The activating reset signal duration is longer than the activating gate signal duration.
    Type: Application
    Filed: September 7, 2012
    Publication date: October 3, 2013
    Applicant: SAMSUNG DISPLAY CO., LTD
    Inventors: Kwang-chul JUNG, Meehye JUNG, Uk Chul CHOI, Hyun Sik HWANG
  • Publication number: 20130222355
    Abstract: The present invention applies the voltage that is swung to the notch electrode of each pixel of the electrowetting display device to reset the oil layer to not backflow such that an additional element is not disposed in the pixel, thereby increasing the aperture ratio of the pixel. Also, the reset signal generator generating and applying the reset signal is disposed inside the electrowetting display device such that additional wiring may not be disposed in the outer part of the panel.
    Type: Application
    Filed: July 20, 2012
    Publication date: August 29, 2013
    Applicant: Samsung Display Co., Ltd.
    Inventors: Uk Chul CHOI, Cheol Woo Park, Hyun Sik Hwang, Yong Jun Jang
  • Publication number: 20130076722
    Abstract: A display apparatus includes a display panel, a gate driver, and a data driver. The display panel includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels connected to the gate lines and the data lines to display an image. The gate driver is configured to apply a gate signal to the gate lines and the data driver is configured to apply a data signal to the data lines. At least one intermediate voltage having a voltage level between a first voltage and a second voltage and a data voltage corresponding to a specific gray scale are sequentially applied to at least one pixel of the pixels as the data signal during a frame period.
    Type: Application
    Filed: March 7, 2012
    Publication date: March 28, 2013
    Inventors: Uk Chul Choi, Cheol Woo Park, Hyun Sik Hwang, Yongjun Jang
  • Publication number: 20130009938
    Abstract: A display device includes a first gate driver that applies a gate-on voltage to gate lines of a first gate line group in each period of n first scan periods for a first frame, n being a natural number. A second gate driver applies a gate-on voltage to gate lines of a second gate line group in each period of n second scan periods for a first frame. A data driver applies a data voltage to a plurality of data lines. A signal controller transmits a control signal to the first and second gate drivers and the data driver, wherein an interval between start points of the n first scan periods is gradually decreased according to time, and an interval between start points of the n second scan periods is gradually increased according to time.
    Type: Application
    Filed: November 28, 2011
    Publication date: January 10, 2013
    Inventors: HYUN-SIK HWANG, Uk-Chul Choi, Cheol-Woo Park, Jong-Hee Kim, KyoungHo Lim
  • Publication number: 20120223928
    Abstract: A method for driving an electrophoresis display device includes applying a reset voltage having a first polarity to electrophoresis material of the display device for at least one frame period to display a reset image, applying a first gradation voltage having a second polarity opposite to the first polarity to the electrophoresis material for one frame period to display a first grey image after the reset image is displayed, applying a second gradation voltage having the second polarity to the electrophoresis material corresponding to at least one pixel region of the display device for at least two frame periods to display a second grey image, after the first grey image is displayed; and applying a third gradation voltage having the first polarity to the electrophoresis material corresponding to at least one pixel region for one frame period to display a third grey image, after the second grey image is displayed.
    Type: Application
    Filed: October 19, 2011
    Publication date: September 6, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: KyoungHo LIM, Cheolwoo PARK, Uk chul CHOI, JongHee KIM, Hyun Sik HWANG
  • Publication number: 20120098872
    Abstract: A method of driving an electrophoretic display panel includes: applying a first voltage having a first polarity with respect to a reference voltage to an electrophoretic display panel to display an N-th image, where N is a natural number; applying the first voltage to the electrophoretic display panel, on which the N-th image is displayed, to display a first full-grayscale image; applying a second voltage having a second polarity with respect to a reference voltage to an electrophoretic display panel, on which the first full-grayscale image is displayed, to display a second full-grayscale image, where the second polarity is opposite to the first polarity; and applying the first polarity voltage to the electrophoretic display panel, on which the second full grayscale image is displayed, to display an (N+1)-th image.
    Type: Application
    Filed: July 13, 2011
    Publication date: April 26, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jong-Hee KIM, Cheol-Woo PARK, Uk-Chul CHOI, Hyun-Sik HWANG, Kyoung-Ho LIM
  • Publication number: 20090251404
    Abstract: An electrophoretic display includes first and second gate lines, a data line that crosses the first and second gate lines, a first pixel connected to the first gate line and the data line, and a second pixel positioned on the opposite side of the data line from the first pixel and connected to the second gate line and the data line.
    Type: Application
    Filed: April 29, 2008
    Publication date: October 8, 2009
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyun-Sik HWANG, Cheol-Woo PARK, Joo-Young KIM
  • Patent number: 6652007
    Abstract: Disclosed is a connector of a fuel pipe for vehicle, which can be easily mounted on or separated from a connector housing by adjusting a latch. The latch includes guide members oppositely located at a prescribed interval, push members vertically located away from the opposite sides of the guide members, and two pair waved resilient members disposed on the upper and lower portions of the guide members. Each guide member has a curved inner surface, a slant surface on the front portion for guiding an insertion of the pipe, a fixed jaw on the rear portion for retaining a bead formed on the peripheral surface of the pipe, and a guide groove formed in the center portion thereof. The two pair waved resilient members elastically connect the push members and the guide members to provide a powerful elastic force to the two pair waved resilient members, so that the guide members are extended outward when the push members are pressed.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: November 25, 2003
    Inventor: Hyun Sik Hwang