Patents by Inventor Chan Choi

Chan Choi 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).

  • Publication number: 20100097006
    Abstract: The present invention relates to a switching mode power supply circuit for a plasma display panel comprising an input unit, a PFC (Power Factor Correction) unit, an output unit and a standby unit, wherein the standby unit includes a standby block for outputting a standby voltage by being connected to an AC filter stage of the input unit, a sequence block for sequentially applying power of the output unit and a control block which is connected between the standby block and the sequence block and inputs the standby voltage outputted from the standby block to the sequence block only in case that a PS_ON signal is applied.
    Type: Application
    Filed: December 11, 2008
    Publication date: April 22, 2010
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Peel Sik JEON, Dong Kyun Ryu, Won Chan Choi, Jae Han Yoon, Ki Mok Kim, Jeong Rak Lee, Seung Heun Yang
  • Patent number: 7629090
    Abstract: A reticle and a method of producing the same are disclosed. The reticle includes a medium layer formed on a transparent substrate, chrome layer patterns spaced apart from each other at predetermined intervals on the medium layer, and a frame and a pellicle formed to enclose the resulting structure. The method of manufacturing a reticle includes the steps of forming a medium layer on a transparent substrate, forming chrome layers on the medium layer, patterning the chrome layers so that the chrome layers are spaced apart from each other at predetermined intervals, and attaching a frame and a pellicle to surround the result. The resolution and focus of light output from the reticle is improved.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: December 8, 2009
    Assignee: Hynix Semiconductor Inc.
    Inventor: Chul Chan Choi
  • Patent number: 7625770
    Abstract: A liquid crystal display and a fabricating method thereof for improving an aperture ratio are disclosed. A liquid crystal display (LCD) according to the present invention includes a gate line, a data line and a common line on the thin film transistor array substrate, the gate line crossing the data line to define a pixel region; a thin film transistor near the crossing of the gate line and the data line; a common electrode connected to the common line in the pixel region; and a pixel electrode connected to the thin film transistor in the pixel area for forming an in-plane electric field in association with the common electrode during an operation of the LCD, wherein an edge of the pixel electrode overlaps the common line with at least one insulating layer therebetween, and an edge of the common electrode overlaps the pixel electrode with said at least one insulating layer therebetween.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: December 1, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Hyun Kyu Lee, See Hwa Jeong, Seung Chan Choi
  • Publication number: 20090269935
    Abstract: A method of forming patterns of a semiconductor device, wherein a hard mask is formed over a semiconductor substrate; a photoresist comprising silicon-containing molecules is formed over the hard mask; a first exposure process is performed on first regions of the photoresist; a second exposure process is performed on second regions of the photoresist, which are located between the first regions; a bake process is performed on the photoresist; and, an etch process using the first regions and the second regions as etch mask patterns is performed, thereby patterning the photoresist and the hard mask.
    Type: Application
    Filed: June 27, 2008
    Publication date: October 29, 2009
    Applicant: HYNIX SEMICONDUCTOR, INC.
    Inventor: CHUL CHAN CHOI
  • Patent number: 7557886
    Abstract: A liquid crystal display device includes first and second substrates; a gate line and a data line on the first substrate to define a unit pixel having first and second sub-pixel regions; first and second switching devices in the first and second sub-pixel regions; a plurality of first and second common electrodes in the first and second sub-pixel regions; a plurality of first and second pixel electrodes in the first and second sub-pixel regions; a common line shared by the unit pixel and an adjacent unit pixel; and a liquid crystal layer between the first and second substrates.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: July 7, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Hyun Kyu Lee, Seung Chan Choi
  • Publication number: 20090154278
    Abstract: An apparatus and method for reducing power consumption within dynamic memory devices having internal self-refresh circuitry. The circuits for generating isolator control (ISO), pre-decoded row address (PXID) and/or word enable (WE) signals are configured in response to receipt of self-refresh and refresh counter signals to output different timing and sequencing when in self-refresh mode than when in normal mode of the memory device. Conventionally, ISO signals are controlled from a block selection circuit which also controls bit line equalization (BLEQ) and sense amplifier enable (SAPN). While in conventional circuits the PXID and WE signals are generated in response to the output of the address decoder and thus have a fixed timing in relation to the output of the address decoder. The use of different timing and sequencing can lower power consumption, such as by outputting fewer signal transitions per block during self-refresh.
    Type: Application
    Filed: December 11, 2008
    Publication date: June 18, 2009
    Applicant: ZMOS TECHNOLOGY, INC.
    Inventors: Myung Chan-Choi, Seung-Moon Yoo, Arthur Kwon
  • Publication number: 20090137077
    Abstract: A liquid crystal display and a fabricating method thereof for improving an aperture ratio are disclosed. A liquid crystal display (LCD) according to the present invention includes a gate line, a data line and a common line on the thin film transistor array substrate, the gate line crossing the data line to define a pixel region; a thin film transistor near the crossing of the gate line and the data line; a common electrode connected to the common line in the pixel region; and a pixel electrode connected to the thin film transistor in the pixel area for forming an in-plane electric field in association with the common electrode during an operation of the LCD, wherein an edge of the pixel electrode overlaps the common line with at least one insulating layer therebetween, and an edge of the common electrode overlaps the pixel electrode with said at least one insulating layer therebetween.
    Type: Application
    Filed: January 16, 2009
    Publication date: May 28, 2009
    Inventors: Hyun Kyu Lee, See Hwa Jeong, Seung Chan Choi
  • Publication number: 20090129494
    Abstract: An apparatus and method for canceling a Direct Current (DC) offset in a Broadband Wireless Access (BWA) communication system are provided. The method includes canceling a DC offset by performing self-calibration in a modulator/demodulator (modem), attempting initial synchronization acquisition in the modem, and if the initial synchronization acquisition succeeds, canceling a DC offset by performing DC offset trace and cancellation.
    Type: Application
    Filed: November 21, 2008
    Publication date: May 21, 2009
    Inventors: Dong-Woo LEE, Yong-Won Shin, Hee-Chan Choi
  • Patent number: 7529333
    Abstract: A shift register includes first and second stages for sequentially outputting scan pulses to drive first and second gate lines. One of the first and second stages includes a pull-up switching device connected to an enabling node of the one of the first and second stages; a first pull-down switching device connected to a first disabling node of the one of the first and second stages; a second pull-down switching device connected to a second disabling node of the one of the first and second stages; and a node controller. The node controller of the first stage controls the logic state of each of the enabling node of the first stage, the first disabling node of the first stage and the first disabling node of the second stage. The node controller of the second stage controls the logic state of each of the enabling node of the second stage, the second disabling node of the second stage and the second disabling node of the first stage.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: May 5, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Binn Kim, Hae Yeol Kim, Hyung Nyuck Cho, Soo Young Yoon, Seung Chan Choi, Min Doo Chun, Yong Ho Jang
  • Patent number: 7522464
    Abstract: Dynamic Random Access Memory (DRAM) circuits and methods are described for reducing leakage and increasing repaired yield. These objects are accomplished according to the invention by grouping refresh cycles within a single activation of power control, the use of limiting circuits or fuses to mitigate power losses associated with micro-bridging of bit-lines and word-lines, modulating the bit-line voltage at the end of precharge cycles, configuring refresh control circuits to use redundant word-lines in generating additional refresh cycles for redundant rows of memory cells, and combinations thereof. In one aspect, word-line fuses indicate modes of use as: unused, replacement, additional refresh, and replacement with additional refresh. The refresh control circuit utilizes these modes in combination with the X-address stored in the word-line fuses for controlling the generation of additional refresh cycles toward overcoming insufficient data retention intervals in select memory cell rows.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: April 21, 2009
    Assignee: ZMOS Technology, Inc.
    Inventors: Seung-Moon Yoo, Myung Chan Choi, Sangho Shin, Sang-Kyun Han
  • Publication number: 20090073880
    Abstract: A system and method is disclosed for controlling congestion in communications between an RSE and multiple OBEs in a DSRC system. In certain embodiments, a system and method for controlling congestion in communications between an RSE and multiple OBEs includes determining a priority level for each of multiple OBEs with respect to reserving a channel between each OBE and an RSE. Based on this determination, each OBE is assigned a waiting period based on their respective priority levels. The OBEs then send requests to reserve a channel to the RSE after waiting the assigned waiting periods.
    Type: Application
    Filed: December 27, 2006
    Publication date: March 19, 2009
    Inventors: Pu Sik Park, Dae Kyo Shin, Ki Tag Lim, Jae Min Kwak, Jong Chan Choi
  • Publication number: 20090073374
    Abstract: A liquid crystal display and a method for fabricating the same are disclosed, which can yield maximum liquid crystal efficiency from all areas within the pixels by orienting the liquid crystals in a manner that the liquid crystals are twisted by 90° in an area above the electrodes and twisted by 180° in an area in-between the electrodes. The liquid crystal display device includes, a pixel electrode insulated from a counter electrode having a plurality of slits on a first substrate, a second substrate facing into and adhered to the first substrate and having a liquid crystal layer formed therebetween, and an orientation layer formed on each inner surface of the first substrate and the second substrate, wherein one orientation layer is oriented to be twisted by 90° from above the pixel electrode and the other orientation layer is oriented to be twisted by 180° from above the slit.
    Type: Application
    Filed: November 12, 2008
    Publication date: March 19, 2009
    Inventors: Hyun Kyu Lee, Seung Chan Choi
  • Patent number: 7495733
    Abstract: A liquid crystal display and a fabricating method thereof for improving an aperture ratio are disclosed. A liquid crystal display (LCD) according to the present invention includes a gate line, a data line and a common line on the thin film transistor array substrate, the gate line crossing the data line to define a pixel region; a thin film transistor near the crossing of the gate line and the data line; a common electrode connected to the common line in the pixel region; and a pixel electrode connected to the thin film transistor in the pixel area for forming an in-plane electric field in association with the common electrode during an operation of the LCD, wherein an edge of the pixel electrode overlaps the common line with at least one insulating layer there between, and an edge of the common electrode overlaps the pixel electrode with said at least one insulating layer therebetween.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: February 24, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Hyun Kyu Lee, See Hwa Jeong, Seung Chan Choi
  • Publication number: 20080309687
    Abstract: A data driving apparatus and method for a liquid crystal display (LCD) device is provided, the apparatus including: a liquid crystal panel; a timing controller configured to output control signals for controlling the driving of a gate driving unit and a data driving unit; a gate driving unit configured to output a gate on signal to gate lines of the liquid crystal panel; a data driving unit configured to drive data lines of the liquid crystal panel, the data driving unit providing an overdriving signal to at least one of a pair of pixel signals of the same polarity applied to adjacent data lines for supply to longitudinally adjacent pixels of the liquid crystal panel, and wherein the data driving unit drives the liquid crystal panel according to a longitudinal two-dot inversion polarity pattern.
    Type: Application
    Filed: May 1, 2008
    Publication date: December 18, 2008
    Applicant: LG DISPLAY CO., LTD.
    Inventors: Seung-Chan Choi, Min-Doo Chun, Binn Kim, Nam-Wook Cho
  • Patent number: 7466383
    Abstract: A liquid crystal display and a method for fabricating the same are disclosed, which can yield maximum liquid crystal efficiency from all areas within the pixels by orienting the liquid crystals in a manner that the liquid crystals are twisted by 90° in an area above the electrodes and twisted by 180° in an area in-between the electrodes. The liquid crystal display device includes, a pixel electrode insulated from a counter electrode having a plurality of slits on a first substrate, a second substrate facing into and adhered to the first substrate and having a liquid crystal layer formed therebetween, and an orientation layer formed on each inner surface of the first substrate and the second substrate, wherein one orientation layer is oriented to be twisted by 90° from above the pixel electrode and the other orientation layer is oriented to be twisted by 180° from above the slit.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: December 16, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Hyun Kyu Lee, Seung Chan Choi
  • Patent number: 7450906
    Abstract: A method and apparatus are provided for removing cross modulation (CM) noise in a wireless transceiver. A determination is made as to whether a transmission signal to be supplied to a transmitter of the wireless transceiver is present. If the transmission signal is present, a level of the transmission signal is determined. When a value of the transmission signal level is equal to or greater than a predetermined value, a first number of filtering operations are performed on a received signal to be input into a receiver of the wireless transceiver. However, when no transmission signal is present or the value of the transmission signal level is less than the predetermined value, a second number of filtering operations are performed on the received signal to be input into the receiver of the wireless transceiver. The first number of filtering operations being greater than the second number of filtering operations.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: November 11, 2008
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hee-Chan Choi, Hyung-Weon Park
  • Patent number: 7440063
    Abstract: A method of fabricating an FFS LCD is provided. The fabrication method comprises: forming a common electrode and gate metal on a board and etching them through a first mask process; forming a gate insulating layer, active layer and source/drain metal on the board; forming a channel in a TFT part, removing the gate metal in the pixel area part and opening a gate pad part; forming a passivation layer substantially on the board, and forming a contact hole on the TFT part, removing the active layer remaining from the pixel area part and exposing a gate pad part and a data pad part by a third mask process; and forming a pixel electrode substantially on the board, and forming a pixel electrode on regions contacting the drain electrode in the TFT part, having the opening in pixel area part and opened regions of the gate pad and data pad part through a fourth mask process.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: October 21, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Seung Chan Choi, Hyun Kyu Lee
  • Publication number: 20080252624
    Abstract: Disclosed herein is a liquid crystal display device which is capable of reducing the number of data drive integrated circuits (ICs) to curtail a production cost. The liquid crystal display device includes a plurality of pixel cells formed respectively in areas defined by a plurality of gate lines and a plurality of data lines, a first unit pixel including at least three of the pixel cells, the at least three pixel cells being connected to different ones of the data lines, and a second unit pixel including at least three of the pixel cells other than the at least three pixel cells of the first unit pixel, the at least three pixel cells of the second unit pixel being connected respectively to the different data lines to which the at least three pixel cells of the first unit pixel are connected, wherein the first and second unit pixels are arranged in a direction of the data lines and connected to different ones of the gate lines.
    Type: Application
    Filed: December 27, 2007
    Publication date: October 16, 2008
    Applicant: LG.PHILIPS LCD CO., LTD.
    Inventors: Yong Ho Jang, Binn Kim, Seung Chan Choi
  • Publication number: 20080188181
    Abstract: The hands-free function provision apparatus for use in the mobile communication terminal using the ZigBee protocol includes: a mobile communication terminal for performing transmission/reception of a voice signal via a base station; a ZigBee coordinator for transmitting or receiving a predetermined display signal and a call control signal for establishing a call connection state to/from the mobile communication terminal, modulating or demodulating the predetermined display signal, the call control signal, and the voice signal using the ZigBee protocol; and a ZigBee device for performing wireless transmission/reception with the ZigBee coordinator by modulating or demodulating the predetermined display signal, the call control signal, and the voice signal using the ZigBee protocol, and visually providing the predetermined display signal.
    Type: Application
    Filed: November 8, 2005
    Publication date: August 7, 2008
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Eun Chan Choi, Jae Doo Huh, Kwang Roh Park, Sun Ho Min
  • Publication number: 20080165012
    Abstract: Disclosed is an apparatus and a method for improving the receive (Rx) sensitivity of a portable Radio Frequency IDentification (RFID). The portable RFID reader/writer is equipped with a variable phase shifter which is connected between an antenna and a directional coupler and then changes an impedance in the direction of the antenna in response to controlling a phase shift, a level of a reflection signal if a transmit (Tx) signal of the portable RFID reader/writer reflected by the antenna flows into an Rx path is measured, and then the phase shift of the variable phase shifter is controlled in such a manner as to minimize the measured level of the reflection signal. Therefore, calibration is implemented so that an antenna impedance changing in response to a position in which contact is made by a user's hand may have an adaptively optimal antenna reflection coefficient, thereby improving the Rx sensitivity.
    Type: Application
    Filed: December 27, 2007
    Publication date: July 10, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hee-Chan CHOI, Seung-Bum Kim, Dong-Woo Lee