Patents by Inventor Joon Ho Na

Joon Ho Na 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: 9143090
    Abstract: The present invention relates to an output voltage stabilization circuit. Specifically, the present invention relates to an output voltage stabilization circuit of a display device driving circuit, which generates a reference current dependent on a high source voltage using a current source independent of a magnitude of the high source voltage, generates a reference current dependent on a low source voltage using a current source independent of a magnitude of the low source voltage, and then generates a control signal by comparing the magnitudes to each other, whereby the output voltage stabilization circuit may stabilize an output voltage regardless of an order in which the low source voltage and the high source voltage are turned off in a circuit using both the low source voltage and the high source voltage.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: September 22, 2015
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Jung Il Seo, Yong Jung Kwon, An Young Kim, Joon Ho Na, Yun Tack Han, Ji Hun Kim, Hyun Min Song, Yeong Joon Son, Sung Wan Jung, Sang Woo Kim, Hae Won Lee
  • Patent number: 9129551
    Abstract: Disclosed are a driving circuit of a display apparatus and a driving chip, which shuts off the output of image data, in a display apparatus in which a plurality of driving chips is connected to each other in a daisy chain method to correspond to a single display panel, when serial communication of the driving chips is not completed successfully, or when any one of the driving chips is not operated normally, thereby preventing an abnormal screen from being displayed.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: September 8, 2015
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Young-Gi Kim, Na-Ra Hong, Hye-Lan Kim, Joon-Ho Na
  • Patent number: 9118324
    Abstract: Provided is a driver IC chip of a liquid crystal display (LCD). The driver IC chip has a layout of power pads, which may uniformly apply an adhesive force on the entire adhesion surface of the driver IC chip, when the driver IC chip is mounted on a display panel according to a chip-on-glass (COG) technique.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: August 25, 2015
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Jeong Cheul Choi, An Young Kim, Joon Ho Na, Dae Seong Kim, Dae Keun Han
  • Patent number: 9093244
    Abstract: A method for routing gamma voltages in a flat panel display that includes a plurality of source driver integrated circuits (SDICs) each having a plurality of gamma buffers. The method includes forming routing lines to route a plurality of gamma voltages; connecting the routing lines to output terminals of the gamma buffers; applying the reset gamma voltage to the gamma buffer of selected SDIC after selecting the SDIC in which the gamma voltage is required to be reset in consideration of heating values of the SDICs, and changing connection between a routing line corresponding to the selected gamma buffer and a tap point of a resistor string of the SDIC such that the connection corresponds to the reset gamma voltage.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: July 28, 2015
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Dae-Keun Han, Dae-Seong Kim, Joon-Ho Na, Hong-Hee Son, Hyun-Ho Cho, Hyung-Seog Oh
  • Patent number: 9082355
    Abstract: A liquid crystal display driving circuit and method. A data register block of a controller applies in advance a polarity control signal to data before the data are stored in latches of a data driver, exchanges the data, and then stores the exchanged data in the latches. Thereby, it is possible to provide multiplexers, which are otherwise required for respective channels, to one controller and to decrease the size of a chip.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: July 14, 2015
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Soo Woo Kim, An Young Kim, Joon Ho Na, Dae Seong Kim, Dae Keun Han
  • Patent number: 9035925
    Abstract: Disclosed is a technique, in which when driving chips are used in which control units are respectively merged in driving devices, all modes of the other driving chips are simultaneously converted into a fail safe mode when one driving chip detects a non-signal state. A circuit for controlling a non-signal of a flat panel display device includes a plurality of driving chips. When detecting a non-signal state that the normal signal (LVDS) is not inputted from an outside, each of the plurality of driving chips simultaneously changes potentials of non-signal detection pads of its own driving chip and another driving chip so that all the driving chips are operated in the fail safe mode.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: May 19, 2015
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Byung-Min Kim, Young-Gi Kim, Dong-Yun Jeong, Joon-Ho Na
  • Patent number: 9030453
    Abstract: An LCD driving circuit includes a first buffer configured to have a terminal for a first voltage, a terminal for a second voltage and a terminal for an intermediate voltage between the first voltage and the second voltage, and be driven in a range from the first voltage to the intermediate voltage; and a second buffer configured to have a terminal for the first voltage, a terminal for the second voltage and a terminal for the intermediate voltage, and be driven in a range from the intermediate voltage to the second voltage. The terminal for the intermediate voltage of the first buffer and the terminal for the intermediate voltage of the second buffer are connected with each other, and the first voltage is a highest voltage, the second voltage is a lowest voltage, and the intermediate voltage is in a range from the first voltage to the second voltage.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: May 12, 2015
    Assignee: Silicon Works Co., Ltd.
    Inventors: Hyun Ho Cho, Young Icc Jung, Young Suk Son, Joon Ho Na, Hyung Seog Oh, Dae Seong Kim, Dae Keun Han
  • Patent number: 8963905
    Abstract: Disclosed is a liquid crystal display panel driving circuit for driving a liquid crystal display panel with a resolution of N bits. N-bit digital data including upper X bits and lower Y bits is inputted. The liquid crystal display panel driving circuit includes a resistor string unit according to areas, a DAC converter switching unit according to areas, and an interpolation amplifier. The resistor string unit outputs analog reference voltages at different ratios according to three areas. The DAC converter switching unit receives the N-bit digital data, selects (Y+1) analog voltages from the analog reference voltages based on the upper X bits, outputs the (Y+1) analog voltages, and outputs the (Y+1) analog voltages of different combinations based on the lower Y bits. The interpolation amplifier receives the (Y+1) analog voltages and generates an interpolated output voltage by setting weights for the (Y+1) analog voltages by using multi-factors.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: February 24, 2015
    Assignee: Silicon Works Co., Ltd.
    Inventors: Hyun-Ho Cho, Ji-Hun Kim, Joon-Ho Na, Hyung-Seog Oh, Dae-Seong Kim, Dae-Keun Han
  • Publication number: 20150015473
    Abstract: Disclosed are a display driving circuit and a display device. The display driving circuit includes an output buffer unit that outputs a pair of pixel signals, an output switch unit that directly transfers the pair of pixel signals to a pair of output lines or transfers the pair of pixel signals to the pair of output lines such that the pair of pixel signals cross each other in correspondence with repetitive panel charging/discharging periods, and a charge sharing switch unit that controls charge sharing of the pair of output lines in correspondence with a charge sharing period between the panel charging/discharging periods, and provides a variable connection resistance value for the charge sharing. Consequently, power consumption and heat generation of the display driving circuit are reduced.
    Type: Application
    Filed: July 10, 2014
    Publication date: January 15, 2015
    Inventors: Hark Jin JUNG, Ki Sun JUNG, Hyun Ho CHO, Joon Ho NA, Hyun Kyu JEON, Yong Icc JUNG
  • Patent number: 8933919
    Abstract: Disclosed is a liquid crystal panel driving circuit of display stabilization, including: a plurality of output buffers buffering data voltage and supplying or cutting off the buffered data voltage to or from each of the plurality of data lines; an output MUX switch receiving outputs from two adjacent output buffers of the plurality of output buffers and transferring one of the two outputs to the plurality of data lines; a garbage switch connecting each of the plurality of data lines to a ground terminal; and a power on sensor or a power off sensor generating a power on or off reset signal in response to a turn on/off of a power supply voltage, wherein the output MUX switch is turned-off and the charge share switch and the garbage switch are turned-on, in response to the power on reset signal or the power off reset signal.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: January 13, 2015
    Assignee: Silicon Works Co., Ltd.
    Inventors: Yeong-Joon Son, Ji-Hun Kim, Sang-Min Lee, Joon-Ho Na, Hae-Won Lee
  • Publication number: 20150009202
    Abstract: Disclosed is a display driving circuit including an output buffer unit that is connected to a common voltage and first and second voltages and outputs a pair of pixel signals; an output switch that directly connects the pair of pixel signals to a pair of output lines or connects the pair of pixel signals to the pair of output lines such that they cross each other; and a pre-charging unit that charges the pair of output lines by using pre-charging voltages. Consequently, power consumption and heat generation of the display driving circuit are reduced.
    Type: Application
    Filed: July 8, 2014
    Publication date: January 8, 2015
    Inventors: Hyun Ho CHO, Joon Ho NA, Hyun Kyu JEON, Yong Icc JUNG
  • Patent number: 8913048
    Abstract: Provided is a technology for preventing noisy data from being displayed before valid data is inputted when power is turned on in a liquid crystal display.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: December 16, 2014
    Assignee: Silicon Works Co., Ltd.
    Inventors: Hun Yong Lim, Jung Hwan Choi, An Young Kim, Joon Ho Na, Dae Seong Kim, Dae Keun Han
  • Publication number: 20140300654
    Abstract: The present invention aims to provide a driving control circuit of a display device, which includes a plurality of data driving circuits each having a timing controller merged with a source driver. The data driving circuits are configured to synchronize data of the respective data driving circuits and compensate for a difference between a data enable signal and a gate output enable signal, when an abnormal display signal is received.
    Type: Application
    Filed: February 25, 2014
    Publication date: October 9, 2014
    Applicant: SILICON WORKS CO., LTD
    Inventors: Young-Gi KIM, Hye-Lan Kim, Na-Ra Hong, Joon-Ho Na
  • Patent number: 8803859
    Abstract: The present invention relates to a display driving circuit and a display driving system, and more particularly, to a display driving circuit having a half-VDD power supply circuit built therein and a display driving system including the same, in which the display driving circuit is further provided with a half voltage VDD terminal in addition to the highest voltage VDD terminal and the lowest voltage VSS terminal, and the half voltage, which is between the highest voltage and the lowest voltage, is generated and supplied by the half voltage power supply from the inside of the display driving circuit, rather than being supplied from an external power supply.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: August 12, 2014
    Assignee: Silicon Works Co., Ltd.
    Inventors: Hyun Ho Cho, Yong Bok Kim, Pyung Sik Ma, An Young Kim, Yong Icc Jung, Joon Ho Na
  • Patent number: 8775879
    Abstract: Embodiments of the present invention provide a method and apparatus for transmitting data between a timing controller and a source driver. In some embodiments, the method includes a bit error rate test (BERT) function for sensing an error rate in real time when data is transmitted and received between the timing controller and the source driver.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: July 8, 2014
    Assignee: Silicon Works Co., Ltd.
    Inventors: Kwang Il Oh, Yun Tack Han, Soo Woo Kim, Jung Hwan Choi, Hyun Kyu Jeon, Joon Ho Na
  • Patent number: 8730214
    Abstract: Provided is a COG panel system capable of minimizing a block dim effect by considering a relationship among a plurality of chips. The COG panel system includes: an FPC which supplies at least two power supply voltages having a constant voltage level; a plurality of SDIs which are commonly supplied with a bypass power supply voltage from the FPC and generate respective parts of a plurality of consecutive LCD driving signals required for an arbitrary one line of an LCD; and at least one block dim correction resistance.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: May 20, 2014
    Assignee: Silicon Works Co., Ltd.
    Inventors: Kyung Chun Kim, An Young Kim, Joon Ho Na, Dae Seong Kim
  • Patent number: 8698857
    Abstract: The present invention aims to provide a driving control circuit of a display device that is capable of preventing an unnatural black screen. To this end, the driving control circuit is configured to include a plurality of TMICs, each of which is merged with a timing controller and a source driver, and the time controller is configured to adjust end locations of the horizontal blank intervals of data enable signals to match the end locations outputted from TMICs to an end location of a horizontal blank interval of a data enable signal outputted from another TMIC, and, when a gate output enable signal is supplied, perform adjustment so as to indicate a rising edge of the gate output enable signal before the data latch enable signal having the highest frequency is supplied.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: April 15, 2014
    Assignee: Silicon Works Co., Ltd.
    Inventors: Young Ki Kim, Hye Lan Kim, Na Ra Hong, Joon Ho Na
  • Patent number: 8674709
    Abstract: A circuit for measuring a capacitance value of a touch screen includes: a target capacitor unit having a target capacitor charged with a target charging voltage; a target voltage control unit to charge the target capacitor; a reference capacitor unit having a reference capacitor charged with a charging reference voltage; a reference voltage control unit to charge the reference capacitor; a comparator to compare the target charging voltage and the charging reference voltage and output a transition signal at a moment when the target charging voltage becomes higher than the charging reference voltage; and a controller to receive an output signal of the comparator and a clock signal and generate a digital output signal and a control signal, wherein a capacitance value of the target capacitor is measured using a time elapsed from a time when the target capacitor is initialized to a time when the transition signal is outputted.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: March 18, 2014
    Assignee: Silicon Works Co., Ltd.
    Inventors: Ji Hun Kim, Hyun Min Song, Joon Ho Na, Ki Uk Gwak, Sang Gug Lee
  • Publication number: 20130335123
    Abstract: Provided is a driver IC chip of a liquid crystal display (LCD). The driver IC chip has a layout of power pads, which may uniformly apply an adhesive force on the entire adhesion surface of the driver IC chip, when the driver IC chip is mounted on a display panel according to a chip-on-glass (COG) technique.
    Type: Application
    Filed: August 20, 2013
    Publication date: December 19, 2013
    Applicant: Silicon Works Co., Ltd.
    Inventors: Joung Cheul CHOI, An Young Kim, Joon Ho NA, Dae Seong Kim, Dae-Keun Han
  • Patent number: 8610656
    Abstract: Provided is a method of driving a liquid crystal display apparatus, and more particularly, to a method of generating a frame start pulse signal for instructing driving of a specific function of a source driver in a source driver chip of a liquid crystal display apparatus. Accordingly, by generating a frame start pulse signal for instructing driving of a specific function of a source driver in a source driver chip unlike a conventional method where the frame start pulse signal is externally input, it is possible to reduce the number of input pins for inputting the frame start pulse signal and to remove an input line for inputting the frame start pulse signal in a process of mounting the source driver chip in a printed circuit board.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: December 17, 2013
    Assignee: Silicon Works Co., Ltd.
    Inventors: Man-Jeong Ko, An-Young Kim, Joon-Ho Na, Dae-Seong Kim