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: 9978302
    Abstract: A liquid crystal display includes: a liquid crystal panel comprising a plurality of pixel areas, each having a plurality of pixels; and a signal controller configured to receive an original image signal and to generate a target image signal corresponding to the original image signal by using a kickback voltage at each gray level in the original image signal, wherein the signal controller comprises a dithering unit configured to generate a corrected image signal based on dithering patterns corresponding to the target image signal.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: May 22, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Gi Geun Kim, Hyun Sik Hwang, Won Sik Oh, Nam Gon Choi, Yong Jun Jang
  • Patent number: 9972237
    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: Grant
    Filed: March 21, 2016
    Date of Patent: May 15, 2018
    Assignee: 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
  • Patent number: 9959798
    Abstract: A display panel driving apparatus includes a data processing circuit, a data driver, and a gate driver. The data processing circuit increases a first gamma value of input image data of which the gamma value is 0, according to a second gamma value of the input image data of which the second gamma value is not 0. The data driving part outputs a data signal based on the output image data to a data line. The gate driving part outputs a gate signal to a gate line.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: May 1, 2018
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Yoon-Gu Kim, Bong-Im Park, Ik-Hyun Ahn, Hyun-sik Hwang, Woo-Joo Lee, Jin-Young Lee
  • Patent number: 9928772
    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: Grant
    Filed: March 21, 2016
    Date of Patent: March 27, 2018
    Assignee: 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
  • Patent number: 9886883
    Abstract: A display apparatus includes a timing controller and a display panel. The timing controller generates first and second image data based on input image data and generates output image data based on the first and second image data. The first image data corresponds to a boundary region in a first image. The second image data corresponds to a non-boundary region in the first image. The display panel includes a plurality of pixels and displays the first image based on the output image data. The plurality of pixels include boundary pixels corresponding to the boundary region and non-boundary pixels corresponding to the non-boundary region. The boundary pixels operate based on a reference gamma curve. The non-boundary pixels operate based on first and second gamma curves different from the reference gamma curve.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: February 6, 2018
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Ik-Hyun Ahn, Yoon-Gu Kim, Bong-Im Park, Hyun-Sik Hwang
  • Patent number: 9881571
    Abstract: An image display control unit in a three-dimensional image display apparatus is configured to drive gate lines and the data lines so as to provide the display panel with a left eye image signal during a first frame in which a right eye image signal is displayed on the display panel, and with the right eye image signal during a second frame in which the left eye image signal is displayed on the display panel. During the first frame, each of the pixels provides a second capacitor with the right eye image signal, and a first capacitor with the left eye image signal. During the second frame, each of the pixels provides the first capacitor with the right eye image signal, and the second capacitor with the left eye image signal. A backlight unit maintains a turn-on state during the first and second frames.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: January 30, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hyun Sik Hwang, Jung-Won Kim
  • Publication number: 20170361588
    Abstract: Disclosed is a fiber structure including a halogen-free polymer layer such as a styrenic block (SBC) copolymer. The fiber structure has environmentally-friendly properties and reduced weight, as compared to conventional materials such as PVC and has improved low temperature stability, fixing ability and resistance to deformation.
    Type: Application
    Filed: September 15, 2016
    Publication date: December 21, 2017
    Inventors: Oh-Deok Kwon, Hyun-Dae Cho, Hong-Chan Jeon, Myung-Ryoul Lee, Bong-Hyun Park, Keun-Soo Moon, Hyun-Sik Hwang, Joo-Suk Chae, Won-Kyu Park
  • Patent number: 9837037
    Abstract: A method of driving a display panel includes comparing a previous line data and a present line data to generate a charge sharing enable (EQ) signal indicating whether or not a charge sharing is to be applied to a pixel; selectively applying the charge sharing to the present line data utilizing a charge sharing voltage according to the EQ signal to generate a data voltage; and outputting the data voltage to the pixel.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: December 5, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hyun Sik Hwang, Bong-Im Park, Ik Hyun Ahn, Won-Sik Oh, Yoon-Gu Kim, Ho-Seok Son, Young-Woo Choi
  • Patent number: 9805673
    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: Grant
    Filed: January 22, 2014
    Date of Patent: October 31, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Dong-Hwa Shin, Joon-Chul Goh, Won-Sik Oh, Hyun-Sik Hwang, Bong-Hyun You
  • Publication number: 20170287418
    Abstract: A method of driving a display panel includes determining a present polarity of a pixel data signal of a present frame, generating a first compensated grayscale of the pixel data signal of the present frame using a pixel data signal of a previous frame, the pixel data signal of the present frame, and the present polarity, and displaying an image using the first compensated grayscale. The first compensated grayscale varies according to the present polarity.
    Type: Application
    Filed: January 11, 2017
    Publication date: October 5, 2017
    Inventors: HYUN SIK HWANG, Daecheol Kim, Yoongu Kim, Bongim Park, Ik Hyun Ahn, Woojoo Lee, Tae-Jong Jun
  • Publication number: 20170169776
    Abstract: A display apparatus includes a display panel comprising a plurality of data lines, a plurality of gate lines crossing the plurality of data lines and a plurality of pixels connected to the plurality of data lines and the plurality of gate lines, each of the plurality of pixels comprising a plurality of color sub-pixels, and a data driver configured to output data voltages of a positive polarity and a negative polarity opposite to the positive polarity with respect to the reference voltage to the plurality of data lines, wherein a polarity stuck period of at least one color sub-pixel of the plurality of color sub-pixels is different from a polarity stuck period of other color sub-pixel of the plurality of color sub-pixels, and the polarity stuck period is a pixel distance in which a same polarity moves per a frame.
    Type: Application
    Filed: August 24, 2016
    Publication date: June 15, 2017
    Inventors: HYUN SIK HWANG, YOONGU KIM, BONGIM PARK, BYUNGKOOK SIM, IK HYUN AHN
  • Patent number: 9653014
    Abstract: A method of driving an electro wetting display panel includes applying a first data voltage to a pixel part of the display panel during a first section of a frame and applying a second data voltage different from the first data voltage to the same pixel part during a second section of the frame. The first data voltage is converted from display data based on a first gamma curve. The second data voltage is converted from the display data based on a second gamma curve. Light transmittance through the pixel part is changed based on movement of a fluid within the pixel part.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: May 16, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Hyun-Sik Hwang, Uk-Chul Choi, Yong-Jun Jang, Su-Hyeong Park, Ji-Myoung Seo
  • Patent number: 9633595
    Abstract: A display apparatus includes a display panel, a gate driver and a data driver. The display panel includes gate lines, data lines and pixels electrically connected to the gate lines and the data lines. The gate driver is disposed adjacent to a first side of the display panel, and outputs a gate signal to the gate line. The data driver is disposed adjacent to the first side of the display panel, and outputs a data voltage to the data line. A gate signal applied to a position having a low resistance-capacitance (“RC”) delay of the gate line has a kickback slice greater than a kickback slice of a gate signal applied to a position having a high RC delay of the gate line. The kickback slice is defined as a portion having a level lower than a gate-on voltage level in a gate pulse of the gate signal.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: April 25, 2017
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hyun-Sik Hwang, Bong-Im Park, Jung-Deok Seo, Byung-Kook Sim
  • Patent number: 9613554
    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: Grant
    Filed: July 24, 2013
    Date of Patent: April 4, 2017
    Assignee: 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: 20170092201
    Abstract: In a method of operating a display panel, a plurality of data lines are divided into a first data line group through an N-th data line group, where N is a natural number equal to or greater than two. Each of the first through N-th data line groups includes at least two data lines. The first through N-th data line groups are sequentially driven by applying first data voltages through N-th data voltages to the first through N-th data line groups, respectively at different times. A first number of data lines in the first data line group is variable.
    Type: Application
    Filed: March 24, 2016
    Publication date: March 30, 2017
    Inventors: JUNG-DEOK SEO, YOON-GU KIM, BONG-IM PARK, BYUNG-KOOK SIM, HYUN-SIK HWANG
  • Publication number: 20170018255
    Abstract: A display panel driving apparatus includes a data processing circuit, a data driver, and a gate driver. The data processing circuit increases a first gamma value of input image data of which the gamma value is 0, according to a second gamma value of the input image data of which the second gamma value is not 0. The data driving part outputs a data signal based on the output image data to a data line. The gate driving part outputs a gate signal to a gate line.
    Type: Application
    Filed: January 20, 2016
    Publication date: January 19, 2017
    Inventors: YOON-GU KIM, BONG-IM PARK, IK-HYUN AHN, HYUN-SIK HWANG, WON-JOO LEE, JIN-YOUNG LEE
  • Publication number: 20160379541
    Abstract: A display apparatus includes a timing controller and a display panel. The timing controller generates first and second image data based on input image data and generates output image data based on the first and second image data. The first image data corresponds to a boundary region in a first image. The second image data corresponds to a non-boundary region in the first image. The display panel includes a plurality of pixels and displays the first image based on the output image data. The plurality of pixels include boundary pixels corresponding to the boundary region and non-boundary pixels corresponding to the non-boundary region. The boundary pixels operate based on a reference gamma curve. The non-boundary pixels operate based on first and second gamma curves different from the reference gamma curve.
    Type: Application
    Filed: February 25, 2016
    Publication date: December 29, 2016
    Inventors: IK-HYUN AHN, Yoon-Gu Kim, Bong-Im Park, Hyun-Sik Hwang
  • Patent number: 9530380
    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: Grant
    Filed: January 30, 2014
    Date of Patent: December 27, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Dae-Gwang Jang, Hyun Sik Hwang, Gi Geun Kim
  • Publication number: 20160372025
    Abstract: The display device includes a display unit including a plurality of pixels coupled to gate lines and data lines, a gate driving unit for outputting a gate signal to the gate lines, a data driving unit for outputting a data signal to the data lines, a voltage supply unit for supplying, to the gate driving unit a gate-on voltage to generate the gate signal, a gate-off voltage, and a kickback compensation voltage having a voltage level varied at a section of the gate-on voltage, and a display mode control unit for controlling the voltage supply unit to supply the kickback compensation voltage during a first display mode for displaying an image on an entire area of the display unit, and to block supply of the kickback compensation voltage during a second display mode for displaying an image on only a partial area of the display unit.
    Type: Application
    Filed: February 12, 2016
    Publication date: December 22, 2016
    Inventors: Ik Hyun Ahn, Yoon Gu Kim, Bong Im Park, Hyun Sik Hwang
  • Patent number: 9460681
    Abstract: A display device and a driving circuit thereof are disclosed. In one aspect, the display device includes a display panel, a gamma reference voltage generator, a data driver and a driving controller. The display panel includes a plurality of pixels, each pixel including first and second sub-pixels. The gamma reference voltage generator generates one or more first gamma reference voltages each having a high gamma value greater than a reference gamma value, and one or more second gamma reference voltages each having a low gamma value less than the reference gamma value. The data driver generates a data voltage based at least in part on one or more of the first and second gamma reference voltages, and provides the data voltage to the first and second sub-pixels. The driving controller determines a gamma value and a data voltage output pattern according to a driving method of the display panel.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: October 4, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hyun-Sik Hwang, Joon-Chul Goh, Won-Sik Oh