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).

  • Patent number: 7986099
    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: Grant
    Filed: December 11, 2008
    Date of Patent: July 26, 2011
    Assignee: 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
  • Publication number: 20110161355
    Abstract: In a network system based on a content name, a terminal device may generate and transmit a block query requesting a plurality of segments, and may receive segments corresponding to the block query based on a transmission direction of the block query.
    Type: Application
    Filed: November 15, 2010
    Publication date: June 30, 2011
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Ji Hoon Lee, Myeong Wuk Jang, Jae Hoon Kim, Joong Hong Park, Sung Chan Choi
  • Patent number: 7961541
    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: Grant
    Filed: December 11, 2008
    Date of Patent: June 14, 2011
    Assignee: ZMOS Technology, Inc.
    Inventors: Myung Chan-Choi, Seung-Moon Yoo, Arthur Kwon
  • Publication number: 20110111776
    Abstract: Provided is a system for sharing data using a network. When a data transmission apparatus included in the data sharing system generates data, the data transmission apparatus may transmit a data generation message to a data reception apparatus. The data reception apparatus may receive the data based on the data generation message.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 12, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jae Hoon KIM, Myeong Wuk Jang, Ji Hoon Lee, Joong-Hong Park, Sung-Chan Choi
  • Publication number: 20110103659
    Abstract: A medical diagnostic system and a data transmission system are disclosed. The medical diagnostic system includes a medical examination apparatus generating and providing two and three-dimensional image data as a result of diagnosing a target, at least one user terminal, and an image storage-transmission system storing the two and three-dimensional image data provided by the medical examination apparatus and providing the two and three-dimensional image data to the user terminal. The image storage-transmission system provides, in response to a search query about a certain lesion input through the at least one user terminal, at least one thumbnail corresponding to two or three-dimensional image data related to the search query to the user terminal and then provides, in response to selection of a certain thumbnail through the at least one user terminal, two or three-dimensional image data corresponding to the selected certain thumbnail to the user terminal.
    Type: Application
    Filed: October 27, 2010
    Publication date: May 5, 2011
    Inventor: Yea Chan Choi
  • Patent number: 7937044
    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: Grant
    Filed: December 27, 2007
    Date of Patent: May 3, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hee-Chan Choi, Seung-Bum Kim, Dong-Woo Lee
  • Publication number: 20110093600
    Abstract: A Peer-to-Peer (P2P)-based network apparatus and system is provided. The P2P-based network apparatus may sense the movement of a mobile station (MS), select a candidate proxy, and change a proxy of the MS to the candidate proxy.
    Type: Application
    Filed: September 30, 2010
    Publication date: April 21, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ji Hoon LEE, Myeong Wuk Jang, Jae Hoon Kim, Joong-Hong Park, Sung-Chan Choi
  • Patent number: 7929367
    Abstract: Circuits and methods for suppressing integrated circuit leakage currents are described. Many of these circuits and methods are particularly well-suited for use in dynamic memory circuits. Examples describe the use of power, ground, or both and power and ground source transistors used for generating virtual voltages. An aspect of the invention describes lowering refresh current. An aspect describes reducing the standby current. An aspect of the invention describes lowering leakage resulting from duplicated circuits, such as row decoders and word line drivers. An aspect describes methods of performing early wake-up of source transistors. A number of source transistor control mechanisms are taught. Circuit layouts methods are taught for optimizing integrated circuit layouts using the source transistors.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: April 19, 2011
    Assignee: Zmos Technology, Inc.
    Inventors: Seung-Moon Yoo, Myung Chan Choi, Young Tae Kim, Sung Ju Son, Sang-Kyun Han, Sun Hyoung Lee
  • Publication number: 20110085615
    Abstract: A data transmission apparatus and a data reception apparatus, are provided. The apparatuses may share data in a Peer-to-Peer (P2P) scheme via a network. The data transmission apparatus divides data into a plurality of segments, and determines a transmission order with respect to each of the divided segments. The data transmission apparatus and the data reception apparatus share data based on the transmission order of the divided segments.
    Type: Application
    Filed: July 20, 2010
    Publication date: April 14, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jae Hoon KIM, Myeong Wuk Jang, Ji Hoon Lee, Joong-Hong Park, Sung-Chan Choi
  • Publication number: 20110072152
    Abstract: An apparatus and method for receiving data over a network are provided. The data reception apparatus may include a receiver, a congestion decision unit and a suspension session selector. The receiver is configured to receive segments of data, using sessions corresponding to data transmissions apparatuses. The congestion detection unit is configured to determine whether a network to be utilized by a corresponding segment is congested, based on a status of each of the sessions. The suspension selector is configured to select a suspension session from the sessions where the network is determined to be congested.
    Type: Application
    Filed: September 14, 2010
    Publication date: March 24, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ji Hoon LEE, Byoung-Joon Lee, Myeong Wuk Jang, Jae Hoon Kim, Joong-Hong Park, Sung-Chan Choi
  • Publication number: 20110007051
    Abstract: Disposed is a driver for a plasma display panel, which is capable of absorbing surplus power of a plasma display panel by power conversion switching performed according to the switching of a sustain circuit to form a transmission path using resonance between the inductance of a transformer for power conversion and the capacitance of the plasma display panel, without using an energy recovery circuit. The driver includes a power supply unit including preset inductance, and converting alternating current (AC) commercial power into preset driving power by using the inductance, a driving unit switching the driving power from the power supply unit according to a logic signal and supplying the switched driving power to a plasma display panel. Surplus power of the driving unit is transmitted to the power supply unit by resonance between the inductance of the power supply unit and capacitance of the plasma display panel.
    Type: Application
    Filed: December 23, 2009
    Publication date: January 13, 2011
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jae Han YOON, Dong Kyun Ryu, Won Chan Choi, Peel Sik Jeon, Sung Mok Kim, Bum Sik Wang, Kwang Hun Song, Kyung Hyun Kim, Jae Gen Eom
  • Publication number: 20110001724
    Abstract: An electric field communication terminal and a method for operating it are disclosed. Since the communication terminal according to the present invention includes a plurality of signal electrodes, it can perform electric field communication without contacting the user's body, which provides use convenience. In addition, since the plurality of signal electrodes can serve as an input unit, such as a touch screen, the user can efficiently use the communication terminal.
    Type: Application
    Filed: July 1, 2010
    Publication date: January 6, 2011
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Hee Chan CHOI, Hyung Tae Kim
  • Publication number: 20110001467
    Abstract: A method of optimizing a driving voltage of an electronic device includes; iteratively varying the level of a driving voltage provided to the electronic device and performing an operation of the electronic device with each iteration until the operation fails, and then selecting as an operating level for the driving voltage, a level of the driving voltage for an iteration just prior to an iteration in which the operation fails.
    Type: Application
    Filed: June 1, 2010
    Publication date: January 6, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyung Chan CHOI, Hee Joo CHOI, Seung Man SHIN, Hui-Chung BYUN
  • Publication number: 20100330718
    Abstract: A method of manufacturing an LCD device is disclosed.
    Type: Application
    Filed: December 23, 2009
    Publication date: December 30, 2010
    Inventors: Seok Woo Lee, Seung Chan Choi
  • Patent number: 7839701
    Abstract: Circuits and methods are described for reducing leakage current and speeding access within dynamic random access memory circuit devices. A number of beneficial aspects are described. A circuit is described for an enhanced sense amplifier utilizing complementary drain transistors coupled to the sense or restore signals and driven by gate voltages which extend outside of the voltage range between VSS and VDD. The drain transistors are self reverse-biased in a standby mode. A method is also described for reducing leaking in non-complementary sense amplifiers by modifying the sense and restore gate voltages. Another aspect is a new negative word line method utilizing stacked pull-down transistors and a multi-step control circuit. In addition a level shifter scheme is described for preventing unwanted current flow between voltage sources while discharging control signal PX.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: November 23, 2010
    Assignee: ZMOS Technology, Inc.
    Inventor: Myung Chan Choi
  • Publication number: 20100289673
    Abstract: Provided is a method and a terminal for executing a function of a terminal according to data transmitted and received through a human body, which includes detecting a touch in a human body communication signal input unit, wherein the human body communication signal input unit is in a human body communication key mode; determining a number detected touches and determining a number pulse signals transmitted during a time in which the touch is maintained when the touch is detected; and executing a function corresponding to the human body communication signal.
    Type: Application
    Filed: May 18, 2010
    Publication date: November 18, 2010
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Hyung Tae KIM, Hee Chan Choi
  • Patent number: 7773180
    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: November 12, 2008
    Date of Patent: August 10, 2010
    Assignee: LG. Display Co., Ltd.
    Inventors: Hyun Kyu Lee, Seung Chan Choi
  • Publication number: 20100165759
    Abstract: A semiconductor memory device includes a strobe signal generator for receiving a write command and generating a write strobe signal that defines an activation period variably according to an operation frequency, and a data transfer unit for transferring data from an external device to an internal data line in response to the write strobe signal.
    Type: Application
    Filed: June 23, 2009
    Publication date: July 1, 2010
    Inventor: Byeong-Chan Choi
  • Patent number: 7705625
    Abstract: Source transistor configurations are described for reducing leakage and delay within integrated circuits. Virtual power and ground nodes are supported with the use of stacked transistor configurations, such as a two transistor stack between a first virtual supply connection and VSS, and a second virtual supply connection and VDD. Gate drives of these stacked transistors are modulated with different voltage levels in response to the operating power mode of the circuit, for example active mode, active-standby mode, and deep power-down mode. Means for driving these source stacks are described. In one embodiment separate virtual nodes are adapted for different types of circuits, such as buffers, row address strobe, and column address strobe. Other techniques, such as directional placement of the transistors is also described.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: April 27, 2010
    Assignee: Zmos Technology, Inc.
    Inventors: Seung-Moon Yoo, Jae Hoon Yoo, Jeongduk Sohn, Sung Ju Son, Myung Chan Choi, Young Tae Kim, Oh Sang Yoon, Sang-Kyun Han
  • Publication number: 20100097363
    Abstract: Provided is a switching mode power supply circuit for plasma display panel, which includes an EMI filter unit, a PFC unit, an output unit, and a standby unit. The EMI filter unit may include a first line filter connected to a commercial line input power, a first capacitor and discharge resistor connected to the first line filter, a second line filter connected to the first capacitor and discharge resistor, a second capacitor connected to the second line filter, and a relay unit disposed between the first line filter and the first capacitor and discharge resistor. The standby unit may be connected to a contact point of the first line filter and the relay unit.
    Type: Application
    Filed: November 20, 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