Patents by Inventor Hongyu Liu

Hongyu Liu 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: 8194438
    Abstract: Non-volatile static random access memory (nvSRAM) that has a six transistor static random access memory (6T SRAM) cell electrically connected to a non-volatile random access memory (nvRAM) cell. The nvRAM cell has first and second variable magnetic resistors and first, second and third transistors.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: June 5, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yongchul Ahn, Antoine Khoueir, Yong Lu, Hongyue Liu
  • Patent number: 8194437
    Abstract: Various embodiments are generally directed to a method and apparatus associated with operating a first memory device with multiple interfaces and a status register. In some embodiments, a first interface is engaged by a host. A memory device that has a plurality of memory cells comprised of at least a magnetic tunneling junction and a spin polarizing magnetic material is connected to a second interface. A status register is maintained by logging at least an error or busy signal during data transfer operations through the first and second interfaces.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: June 5, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yiran Chen, Daniel S. Reed, Yong Lu, Harry Hongyue Liu, Hai Li, Rod V. Bowman
  • Publication number: 20120127787
    Abstract: A method of self-reference reading a spin-transfer torque memory unit includes applying a first read current through a magnetic tunnel junction data cell and forming a first bit line read voltage. The magnetic tunnel junction data cell has a first resistance state. Then the method includes applying a second read current thorough the magnetic tunnel junction data cell having the first resistance state. The first read current is less than the second read current. Then the first bit line read voltage is compared with the second bit line read voltage to determine whether the first resistance state of the magnetic tunnel junction data cell was a high resistance state or low resistance state.
    Type: Application
    Filed: January 12, 2012
    Publication date: May 24, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yiran Chen, Hai Li, Hongyue Liu, Ran Wang, Dimitar V. Dimitrov
  • Publication number: 20120120713
    Abstract: Apparatus and associated method for asymmetric write current compensation for resistive sense memory (RSM) cells, such as but not limited to spin-torque transfer random access memory (STRAM) or resistive random access memory (RRAM) cells. In accordance with some embodiments, an RSM cell includes an RSM element coupled to a switching device. The switching device has a plurality of terminals. A control circuit compensates for asymmetric write characteristics of the RSM cell by limiting a range of voltage differentials across the terminals so as to be equal to or less than a magnitude of a source voltage applied to the switching device, thereby providing bi-directional write currents of substantially equal magnitude through the RSM element.
    Type: Application
    Filed: January 19, 2012
    Publication date: May 17, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yong Lu, Harry Hongyue Liu
  • Publication number: 20120106241
    Abstract: A spin-transfer torque memory apparatus and self-reference read schemes are described. One method of self-reference reading a spin-transfer torque memory unit includes applying a first read current through a magnetic tunnel junction data cell and forming a first bit line read voltage, the magnetic tunnel junction data cell having a first resistance state and storing the first bit line read voltage in a first voltage storage device. Then applying a low resistance state polarized write current through the magnetic tunnel junction data cell, forming a low second resistance state magnetic tunnel junction data cell. A second read current is applied through the low second resistance state magnetic tunnel junction data cell to forming a second bit line read voltage. The second bit line read voltage is stored in a second voltage storage device.
    Type: Application
    Filed: January 12, 2012
    Publication date: May 3, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Hai Li, Yiran Chen, Hongyue Liu, Kang Yong Kim, Dimitar V. Dimitrov, Henry F. Huang
  • Patent number: 8154914
    Abstract: A method and apparatus for using thermal preconditioning to write data to a non-volatile memory cell, such as a spin-torque transfer random access memory (STRAM) memory cell. In some embodiments, a logical state is written to an unconditioned non-volatile first memory cell associated with a first block address. Thermal preconditioning is concurrently applied to a non-volatile second memory cell associated with a second block address selected in response to the first block address.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: April 10, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yiran Chen, Hai Li, Harry Hongyue Liu, Dimitar V. Dimitrov, Alan Xuguang Wang, Xiaobin Wang
  • Patent number: 8147906
    Abstract: The present invention relates to a polarizer and a method for produce for producing the same, and an LCD device. The polarizer includes a glass substrate and a metal wire grating disposed on the glass substrate. The polarizer disposed on the LCD device can greatly lower cost of the polarizer and the LCD device. Besides, the polarizer does not absorb incident lights so as to greatly reduce energy loss of lights passing through the polarizer and improve the utilization rate of light energy.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: April 3, 2012
    Assignee: Boe Technology Group Co., Ltd.
    Inventors: Ke Wang, Zenghui Sun, Hongyu Liu, Junrui Zhang, Gang Wang, Xibin Shao
  • Patent number: 8144283
    Abstract: The present invention relates to a circuit and a method for repairing a broken line of a flat panel display device. The circuit includes a second repairing line and a resistance access port is disposed on the second repairing line. The method includes: disposing a resistance access port on a second repairing line of the flat panel display device; and connecting a resistance meeting a display requirement to the resistance access port. The above solutions enable the circuit for repairing to adjust the load resistance so as to adjust the display effect by disposing the resistance access port; thereby improving the repairing effect and making the display quality of the repaired flat panel display device meet the requirement.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: March 27, 2012
    Assignee: Boe Technology Group Co., Ltd.
    Inventors: Hongyu Liu, Ke Wang, Gang Wang, Xibin Shao
  • Patent number: 8139397
    Abstract: The present disclosure relates to methods of selectively placing a reference column or reference row in a memory array. The method includes measuring a resistance state resistance value for a plurality of variable resistive memory cells within a memory array and mapping a location of each measured variable resistive memory cell to form a map of the resistance state resistance values for a plurality of variable resistive memory cells within a memory array. Then a column or row is selected to be a reference column or reference row based on the map of the resistance state resistance value for a plurality of variable resistive memory cells within a memory array, to minimize read operation errors, and forming a variable resistive memory cell memory array.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: March 20, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yiran Chen, Hai Li, Wenzhong Zhu, Xiaobin Wang, Henry Huang, Hongyue Liu
  • Patent number: 8125819
    Abstract: Apparatus and associated method for asymmetric write current compensation for resistive sense memory (RSM) cells, such as but not limited to spin-torque transfer random access memory (STRAM) or resistive random access memory (RRAM) cells. In accordance with some embodiments, an RSM cell includes an RSM element coupled to a switching device. The switching device has a plurality of terminals. A control circuit compensates for asymmetric write characteristics of the RSM cell by limiting a range of voltage differentials across the terminals so as to be equal to or less than a magnitude of a source voltage applied to the switching device, thereby providing bi-directional write currents of substantially equal magnitude through the RSM element.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: February 28, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yong Lu, Harry Hongyue Liu
  • Patent number: 8120727
    Abstract: The present invention relates to an array substrate of TFT-LCD and Method for manufacturing the same. The array substrate includes: gate lines, data lines, pixel electrodes and TFTs formed on a substrate; and a grid graph formed on each of the pixel electrode to make each of the pixel electrodes be simultaneously a built-in polarizer and change natural lights into linear polarized lights. The method for manufacturing an array substrate includes: forming a graph including gate electrodes and gate lines on a substrate; depositing continuously a gate insulating layer, a semiconductor layer and a doped semiconductor layer, and forming graphs of semiconductor layers and doped semiconductor layers above the gate electrodes; forming graphs of source electrodes, drain electrodes, data lines and pixel electrodes, in which a grid graph formed on each of the pixel electrode to make each of the pixel electrodes be simultaneously a built-in polarizer and change natural lights into linear polarized lights.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: February 21, 2012
    Assignee: Boe Technology Group Co., Ltd.
    Inventors: Gang Wang, Zenghui Sun, Chuanzhen Liu, Xibin Shao, Hongyu Liu, Ke Wang
  • Publication number: 20120039112
    Abstract: A method and apparatus for reading data from a non-volatile memory cell. In some embodiments, a cross-point array of non-volatile memory cells is arranged into rows and columns. A selection circuit is provided that is capable of activating the first block of memory cells while deactivating the second block of memory cells. Further, a read circuit is provided that is capable of reading a logical state of a predetermined memory cell in the first block of memory cells with a reduced leak current by programming a first resistive state to the block selection elements corresponding to the first block of memory cells while programming a second resistive state to the block selection elements corresponding to the second block of memory cells.
    Type: Application
    Filed: October 24, 2011
    Publication date: February 16, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Chulmin Jung, Yong Lu, Insik Jin, YoungPil Kim, Harry Hongyue Liu
  • Publication number: 20120039113
    Abstract: A memory unit including a first transistor spanning a first transistor region in a first layer of the memory unit; a second transistor spanning a second transistor region in a second layer of the memory unit; a first resistive sense memory (RSM) cell spanning a first memory region in a third layer of the memory unit; and a second RSM cell spanning a second memory region in the third layer of the memory unit, wherein the first transistor is electrically coupled to the first RSM cell, and the second transistor is electrically coupled to the second RSM cell, wherein the second layer is between the first and third layers, wherein the first and second transistor have an transistor overlap region, and wherein the first memory region and the second memory region do not extend beyond the first transistor region and the second transistor region.
    Type: Application
    Filed: October 25, 2011
    Publication date: February 16, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Xuguang Wang, Yong Lu, Hai Li, Hongyue Liu
  • Patent number: 8116122
    Abstract: A spin-transfer torque memory apparatus and self-reference read schemes are described. One method of self-reference reading a spin-transfer torque memory unit includes applying a first read current through a magnetic tunnel junction data cell and forming a first bit line read voltage, the magnetic tunnel junction data cell having a first resistance state and storing the first bit line read voltage in a first voltage storage device. Then applying a low resistance state polarized write current through the magnetic tunnel junction data cell, forming a low second resistance state magnetic tunnel junction data cell. A second read current is applied through the low second resistance state magnetic tunnel junction data cell to forming a second bit line read voltage. The second bit line read voltage is stored in a second voltage storage device.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: February 14, 2012
    Assignee: Seagate Technology LLC
    Inventors: Hai Li, Yiran Chen, Hongyue Liu, Kang Yong Kim, Dimitar V. Dimitrov, Henry F. Huang
  • Patent number: 8116123
    Abstract: A spin-transfer torque memory apparatus and non-destructive self-reference read schemes are described. One method of self-reference reading a spin-transfer torque memory unit includes applying a first read current through a magnetic tunnel junction data cell and forming a first bit line read voltage and storing the first bit line read voltage in a first voltage storage device. The magnetic tunnel junction data cell has a first resistance state. Then the method includes applying a second read current thorough the magnetic tunnel junction data cell having the first resistance state and forming a second bit line read voltage and storing the second bit line read voltage in a second voltage storage device. The first read current is less than the second read current. Then the stored first bit line read voltage is compared with the stored second bit line read voltage to determine whether the first resistance state of the magnetic tunnel junction data cell was a high resistance state or low resistance state.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: February 14, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yiran Chen, Hai Li, Hongyue Liu, Ran Wang, Dimitar V. Dimitrov
  • Publication number: 20120033482
    Abstract: Various embodiments of the present invention are generally directed to a method and apparatus for providing different bit set modes for a resistive sense memory (RSM) array, such as a spin-torque transfer random access memory (STRAM) or resistive random access memory (RRAM) array. In accordance with some embodiments, a group of RSM cells in a non-volatile semiconductor memory array is identified for application of a bit set operation. A bit set value is selected from a plurality of bit set values each separately writable to the RSM cells to place said cells in a selected resistive state. The selected bit set value is thereafter written to at least a portion of the RSM cells in the identified group.
    Type: Application
    Filed: October 17, 2011
    Publication date: February 9, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yiran Chen, Daniel S. Reed, Yong Lu, Harry Hongyue Liu, Hai Li, Rod V. Bowman
  • Publication number: 20120014175
    Abstract: A magnetic memory device includes a magnetic tunnel junction having a free magnetic layer having a magnetization orientation that is switchable between a high resistance state magnetization orientation and a low resistance state magnetization orientation and a memristor solid state element electrically coupled to the magnetic tunnel junction. The memristor has a device response that is an integrated voltage versus an integrated current.
    Type: Application
    Filed: September 23, 2011
    Publication date: January 19, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Xiaobin Wang, Yiran Chen, Alan Wang, Haiwen Xi, Wenzhong Zhu, Hai Li, Hongyue Liu
  • Patent number: 8098513
    Abstract: The present disclosure relates to memory arrays with read reference voltage cells. In particular the present disclosure relates to variable resistive memory cell apparatus and arrays that include a high resistance state reference memory cell and a low resistance state reference memory cell that provides a reliable average reference voltage on chip to compare to a read voltage of a selected memory cell and determine if the selected memory cell is in the high resistance state or low resistance state. These memory arrays are particularly suitable for use with spin-transfer torque memory cells and resolves many systematic issues related to generation of a reliable reference voltage.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: January 17, 2012
    Assignee: Seagate Technology LLC
    Inventors: Hongyue Liu, Yong Lu, Andrew Carter, Yiran Chen, Hai Li
  • Patent number: 8098516
    Abstract: A memory array includes a plurality of magnetic tunnel junction cells arranged in a 2 by 2 array. Each magnetic tunnel junction cell is electrically coupled between a bit line and a source line and each magnetic tunnel junction cell electrically coupled to a transistor. Each magnetic tunnel junction cell is configured to switch between a high resistance state and a low resistance state by passing a write current passing though the magnetic tunnel junction cell. A first word line is electrically coupled to a gate of first set of two of the transistors and a second word line is electrically coupled to a gate of a second set of two of the transistors. The source line is a common source line for the plurality of magnetic tunnel junctions.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: January 17, 2012
    Assignee: Seagate Technology, LLC
    Inventors: Hai Li, Yiran Chen, Hongyue Liu, Xuguang Wang
  • Patent number: 8098510
    Abstract: Variable resistive punchthrough access methods are described. The methods include switching a variable resistive data cell from a high resistance state to a low resistance state by passing a write current through the magnetic tunnel junction data cell in a first direction. The write current is provided by a transistor being electrically coupled to the variable resistive data cell and a source line. The write current passes through the transistor in punchthrough mode.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: January 17, 2012
    Assignee: Seagate Technology LLC
    Inventors: Maroun Georges Khoury, Hongyue Liu, Brian Lee, Andrew John Gjevre Carter