Patents by Inventor Shih-Chung Lee

Shih-Chung Lee 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: 8526233
    Abstract: In a non-volatile storage system, one or more substrate channel regions for an unselected NAND string are boosted during programming to inhibit program disturb. A voltage applied to one or more unselected word lines associated with at least a first channel region is increased during a program pulse time period in which a program pulse is applied to a selected word line. The increase can be gradual, in the form of a ramp, or step-wise. The boosting level of the first channel region can be maintained. The increase in the voltage applied to the one or more unselected word lines can vary with temperature as well. Before the program pulse time period, the voltage applied to the one or more unselected word lines can be ramped up at a faster rate for a second, adjacent channel region than for the first channel region, to help isolate the channel regions.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: September 3, 2013
    Assignee: SanDisk Technologies Inc.
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee, Anubhav Khandelwal, Henry Chin, Guirong Liang, Dana Lee
  • Patent number: 8472266
    Abstract: Methods and devices for sensing non-volatile storage devices in a way that reduces read disturb are disclosed. Techniques are used to reduce read disturb on memory cells that are neighbors to selected memory cells. For example, on a NAND string, the memory cells that are next to the selected memory cell presently being read may benefit. In one embodiment, when reading memory cells on a selected word line WLn, Vread+Delta is applied to WLn+2 and WLn?2. Applying Vread+Delta to the second neighbor word line may reduce read disturb to memory cells on the neighbor word line WLn+1.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: June 25, 2013
    Assignee: SanDisk Technologies Inc.
    Inventors: Anubhav Khandelwal, Jun Wan, Shih-Chung Lee, Dana Lee
  • Publication number: 20120300550
    Abstract: In a non-volatile storage system, one or more substrate channel regions for an unselected NAND string are boosted during programming to inhibit program disturb. A voltage applied to one or more unselected word lines associated with at least a first channel region is increased during a program pulse time period in which a program pulse is applied to a selected word line. The increase can be gradual, in the form of a ramp, or step-wise. The boosting level of the first channel region can be maintained. The increase in the voltage applied to the one or more unselected word lines can vary with temperature as well. Before the program pulse time period, the voltage applied to the one or more unselected word lines can be ramped up at a faster rate for a second, adjacent channel region than for the first channel region, to help isolate the channel regions.
    Type: Application
    Filed: May 23, 2011
    Publication date: November 29, 2012
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee, Anubhav Khandelwal, Henry Chin, Guirong Liang, Dana Lee
  • Publication number: 20120250414
    Abstract: Methods and devices for sensing non-volatile storage devices in a way that reduces read disturb are disclosed. Techniques are used to reduce read disturb on memory cells that are neighbors to selected memory cells. For example, on a NAND string, the memory cells that are next to the selected memory cell presently being read may benefit. In one embodiment, when reading memory cells on a selected word line WLn, Vread+Delta is applied to WLn+2 and WLn?2. Applying Vread+Delta to the second neighbor word line may reduce read disturb to memory cells on the neighbor word line WLn+1.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 4, 2012
    Inventors: Anubhav Khandelwal, Jun Wan, Shih-Chung Lee, Dana Lee
  • Patent number: 8218366
    Abstract: A system for programming non-volatile storage is proposed that reduces the impact of interference from the boosting of neighbors. Memory cells are divided into two or more groups. In one example, the memory cells are divided into odd and even memory cells; however, other groupings can also be used. Prior to a first trigger, a first group of memory cells are programmed together with a second group of memory cells using a programming signal that increases over time. Subsequent to the first trigger and prior to a second trigger, the first group of memory cells are programmed separately from the second group of memory cells using a programming signal that has been lowered in magnitude in response to the first trigger. Subsequent to the second trigger, the first group of memory cells are programmed together with the second group of memory cells with the programming signal being raised in response to the second trigger.
    Type: Grant
    Filed: April 18, 2010
    Date of Patent: July 10, 2012
    Assignee: SanDisk Technologies Inc.
    Inventors: Yingda Dong, Shih-Chung Lee, Ken Oowada
  • Patent number: 8218367
    Abstract: When erasing non-volatile storage, a verification process is used between erase operations to determine whether the non-volatile storage has been successfully erased. The verification process includes separately performing verification for different subsets of the non-volatile storage elements.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: July 10, 2012
    Assignee: SanDisk Technologies Inc.
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee, Toru Miwa, Yupin Fong, Jun Wan, Ken Oowada
  • Patent number: 8189378
    Abstract: A non-volatile semiconductor storage system is programmed in a manner that reduces program disturb by applying a higher boosting voltage on one or more word lines that are connected to non-volatile storage elements that may be partially programmed.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: May 29, 2012
    Assignee: SanDisk Technologies Inc.
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee
  • Patent number: 8184478
    Abstract: A non-volatile semiconductor storage system is programmed in a manner that reduces program disturb by applying a higher boosting voltage on one or more word lines that are connected to non-volatile storage elements that may be partially programmed.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: May 22, 2012
    Assignee: SanDisk Technologies Inc.
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee
  • Publication number: 20120100332
    Abstract: A self bonding floor tile includes a main body and a self bonding layer connected with the main body. The self bonding layer includes an absorbate, a first adhesive and a second adhesive. The first adhesive connects the main body with the self bonding layer. At least a portion of the absorbate extends into the first adhesive, and at least a portion of the second adhesive penetrates into the absorbate for connecting the self bonding layer with a body to be decorated. A method for manufacturing the self bonding floor tile includes: providing a main body; spreading a first adhesive over the main body; providing an absorbate with porous or wick structure, and adding the absorbate to the first adhesive; spreading a second adhesive over the absorbate. The present self bonding floor tile can be quickly installed, easily and partly replaced with low installation and replacement cost.
    Type: Application
    Filed: November 11, 2010
    Publication date: April 26, 2012
    Applicant: Shanghai Jinka Flooring Technology Co., LTD.
    Inventors: HSIUNG-TIEH YU, Shih-Chung Lee
  • Patent number: 8081519
    Abstract: An erase sequence of a non-volatile storage device includes an erase operation followed by a soft programming operation. The erase operation applies one or more erase pulses to the storage elements, e.g., via a substrate, until an erase verify level is satisfied. The number of erase pulses is tracked and recorded as an indicia of the number of programming-erase cycles which the storage device has experienced. The soft programming operation applies soft programming pulses to the storage elements until a soft programming verify level is satisfied. Based on the number of erase pulses, the soft programming operation time is shortened by skipping verify operations for a specific number of initial soft programming pulses which is a function of the number of erase pulses. Also, a characteristic of the soft programming operation can be optimized, such as starting amplitude, step size or pulse duration.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: December 20, 2011
    Assignee: SanDisk Technologies Inc.
    Inventors: Shih-Chung Lee, Gerrit Jan Hemink
  • Publication number: 20110255345
    Abstract: A system for programming non-volatile storage is proposed that reduces the impact of interference from the boosting of neighbors. Memory cells are divided into two or more groups. In one example, the memory cells are divided into odd and even memory cells; however, other groupings can also be used. Prior to a first trigger, a first group of memory cells are programmed together with a second group of memory cells using a programming signal that increases over time. Subsequent to the first trigger and prior to a second trigger, the first group of memory cells are programmed separately from the second group of memory cells using a programming signal that has been lowered in magnitude in response to the first trigger. Subsequent to the second trigger, the first group of memory cells are programmed together with the second group of memory cells with the programming signal being raised in response to the second trigger.
    Type: Application
    Filed: April 18, 2010
    Publication date: October 20, 2011
    Inventors: Yingda Dong, Shih-Chung Lee, Ken Oowada
  • Publication number: 20110235423
    Abstract: When erasing non-volatile storage, a verification process is used between erase operations to determine whether the non-volatile storage has been successfully erased. The verification process includes separately performing verification for different subsets of the non-volatile storage elements.
    Type: Application
    Filed: June 7, 2011
    Publication date: September 29, 2011
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee, Toru Miwa, Yupin Fong, Jun Wan, Ken Oowada
  • Patent number: 7978527
    Abstract: When erasing non-volatile storage, a verification process is used between erase operations to determine whether the non-volatile storage has been successfully erased. The verification process includes separately performing verification for different subsets of the non-volatile storage elements.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: July 12, 2011
    Assignee: SanDisk Technologies Inc.
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee, Toru Miwa, Yupin Fong, Jun Wan, Ken Oowada
  • Publication number: 20110042003
    Abstract: A method of making a floor panel includes the steps of: providing an adhesive on a release member; laminating or marrying the release member to a bottom layer such that the adhesive is between the release member and the bottom layer; removing a portion of the release member to expose an area of the adhesive; and adhering a top layer to the area such that the top layer is offset with respect to the bottom layer in a direction of length and width and a marginal end portion of a top surface of the bottom layer and a marginal end portion of the bottom surface of the top layer is exposed.
    Type: Application
    Filed: August 19, 2010
    Publication date: February 24, 2011
    Inventors: Richard H. Balmer, Shih Chung Lee, Dung V. Dao, John R. Eshbach, JR., Heath E. Harrington, Michael E. Buckwalter, Kean M. Anspach
  • Publication number: 20110042252
    Abstract: A packaging system and a method of packaging a plurality of floor panels in a box includes floor panels having a top layer and a bottom layer. The top layer has a top surface with a visible decorative pattern and a bottom surface adhered to a top surface of the bottom layer such that the bottom layer is offset from the top layer in a direction of length and width and a marginal end portion of the top surface of the bottom layer and a marginal end portion of the bottom surface of the top layer is exposed. At least one of the marginal end portions has an adhesive. The floor panels are stacked in the box in pairs. Each of the pairs is stacked such that the top surfaces of the top layers of each of the pairs of the floor panels are facing each other.
    Type: Application
    Filed: August 19, 2010
    Publication date: February 24, 2011
    Inventors: Richard H. Balmer, Shih Chung Lee, Dung V. Dao, Christopher R. Knafelc, Heath E. Harrington, Kean M. Anspach, Michael E. Buckwalter, John R. Eshbach, JR.
  • Publication number: 20110019483
    Abstract: An erase sequence of a non-volatile storage device includes an erase operation followed by a soft programming operation. The erase operation applies one or more erase pulses to the storage elements, e.g., via a substrate, until an erase verify level is satisfied. The number of erase pulses is tracked and recorded as an indicia of the number of programming-erase cycles which the storage device has experienced. The soft programming operation applies soft programming pulses to the storage elements until a soft programming verify level is satisfied. Based on the number of erase pulses, the soft programming operation time is shortened by skipping verify operations for a specific number of initial soft programming pulses which is a function of the number of erase pulses. Also, a characteristic of the soft programming operation can be optimized, such as starting amplitude, step size or pulse duration.
    Type: Application
    Filed: October 6, 2010
    Publication date: January 27, 2011
    Inventors: Shih-Chung Lee, Gerrit Jan Hemink
  • Patent number: 7839690
    Abstract: An erase sequence of a non-volatile storage device includes an erase operation followed by a soft programming operation. The erase operation applies one or more erase pulses to the storage elements, e.g., via a substrate, until an erase verify level is satisfied. The number of erase pulses is tracked and recorded as an indicia of the number of programming-erase cycles which the storage device has experienced. The soft programming operation applies soft programming pulses to the storage elements until a soft programming verify level is satisfied. Based on the number of erase pulses, the soft programming operation time is shortened by skipping verify operations for a specific number of initial soft programming pulses which is a function of the number of erase pulses. Also, a characteristic of the soft programming operation can be optimized, such as starting amplitude, step size or pulse duration.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: November 23, 2010
    Assignee: SanDisk Corporation
    Inventors: Shih-Chung Lee, Gerrit Jan Hemink
  • Publication number: 20100149881
    Abstract: An erase sequence of a non-volatile storage device includes an erase operation followed by a soft programming operation. The erase operation applies one or more erase pulses to the storage elements, e.g., via a substrate, until an erase verify level is satisfied. The number of erase pulses is tracked and recorded as an indicia of the number of programming-erase cycles which the storage device has experienced. The soft programming operation applies soft programming pulses to the storage elements until a soft programming verify level is satisfied. Based on the number of erase pulses, the soft programming operation time is shortened by skipping verify operations for a specific number of initial soft programming pulses which is a function of the number of erase pulses. Also, a characteristic of the soft programming operation can be optimized, such as starting amplitude, step size or pulse duration.
    Type: Application
    Filed: December 11, 2008
    Publication date: June 17, 2010
    Inventors: Shih-Chung Lee, Gerrit Jan Hemink
  • Patent number: 7675780
    Abstract: In a non-volatile memory system, the programming time period allocated for the program pulse is adjusted as a function of the voltage level of the pump pulse required so that the total number of pump pulses required to program the charge storage element to the required threshold voltage is reduced. For example, programming time period may be increased with an increase in the voltage level of the pump pulse required. This allows the programming time period of the program pulse to be increased to a value that compensates for the increased charge-up time that is required for the higher amplitude program pulses to reach the desired programming voltage.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: March 9, 2010
    Assignee: SanDisk Corporation
    Inventors: Shih-Chung Lee, Toru Miwa
  • Publication number: 20090296475
    Abstract: When erasing non-volatile storage, a verification process is used between erase operations to determine whether the non-volatile storage has been successfully erased. The verification process includes separately performing verification for different subsets of the non-volatile storage elements.
    Type: Application
    Filed: June 3, 2008
    Publication date: December 3, 2009
    Inventors: Gerrit Jan Hemink, Shih-Chung Lee, Toru Miwa, Yupin Fong, Jun Wan, Ken Oowada