Patents by Inventor Kai-Wen Cheng

Kai-Wen Cheng 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: 8905553
    Abstract: A method of detecting a scanning angle range of a laser beam of a laser projector is provided. First, a photo sensor is disposed between first and second positions on a projection mirror. Then, a laser beam emitted from the laser projector scans back and forth between the first and second positions, so that the photo sensor receives the laser beam sequentially at first and second scanning time points to generate first and second sensing signals, respectively. If an actual time interval between the first and second sensing signals conforms to an expected time interval, an actual scanning angle range of the laser beam is determined as normal. If the actual time interval does not conform to the expected time interval, the actual scanning angle range of the laser beam is determined as abnormal and the laser projector stops emitting the laser beam. A laser projector is also provided.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: December 9, 2014
    Assignee: Lite-On Technology Corporation
    Inventors: Chia-Tse Lin, Kai-Wen Cheng
  • Publication number: 20140252513
    Abstract: A Magnetoresistive Tunnel Junction (MTJ) device includes an elongated MTJ structure formed onto a substrate, the MTJ structure including a magnetic reference layer and a tunnel barrier layer. The MTJ device also includes a number of discrete free magnetic regions disposed onto the tunnel barrier layer. The ratio of length to width of the elongated MTJ structure is such that the magnetic field of the magnetic reference layer is pinned in a single direction.
    Type: Application
    Filed: March 9, 2013
    Publication date: September 11, 2014
    Applicant: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chwen Yu, Kai-Wen Cheng, Tien-Wei Chiang, Dong Cheng Chen
  • Patent number: 8823117
    Abstract: The present disclosure provides for magnetic devices and methods of fabricating such a device. In one embodiment, a magnetic device includes a first elliptical pillar of first material layers; a second elliptical pillar concentrically disposed over the first elliptical pillar, the second elliptical pillar includes second material layers. The second elliptical pillar is smaller than the first elliptical pillar in size.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: September 2, 2014
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chewn Yu, Tien-Wei Chiang, Kai-Wen Cheng
  • Patent number: 8809976
    Abstract: The present disclosure provides a magnetoresistive random access memory (MRAM) device. The MRAM device includes a magnetic tunnel junction (MTJ) stack on a substrate; and a dual-layer passivation layer disposed around the MTJ stack. The dual-layer passivation layer includes an oxygen-free film formed adjacent sidewalls of the MTJ stack; and a moisture-blocking film formed around the oxygen-free film.
    Type: Grant
    Filed: September 24, 2011
    Date of Patent: August 19, 2014
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chih-Ming Chen, Chung-Yi Yu, Cheng-Yuan Tsai, Kai-Wen Cheng
  • Patent number: 8804877
    Abstract: An apparatus for correcting a phase error is provided. The apparatus includes an error estimating module and a correcting module. The error estimating module receives a phase-shift keying signal, and calculates a phase error according to the phase-shift keying signal, a plurality of known candidate signals and Bayesian estimation. The correcting module corrects the phase-shift keying signal according to the phase error.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: August 12, 2014
    Assignee: MStar Semiconductor, Inc.
    Inventors: Kai-Wen Cheng, Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Patent number: 8772845
    Abstract: The present disclosure provides a semiconductor memory device. The device includes a pinning layer having an anti-ferromagnetic material and disposed over a first electrode; a pinned layer disposed over the pinning layer; a composite layer disposed over the pinned layer, the composite layer having a magnetic material randomly distributed in a non-magnetic material; a barrier layer disposed on the composite layer; a free layer disposed over the barrier layer; and a second electrode disposed over the free layer.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: July 8, 2014
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chih-Ming Chen, Cheng-Yuan Tsai, Chung-Yi Yu, Kai-Wen Cheng, Kuo-Ming Wu
  • Publication number: 20140168619
    Abstract: A method of detecting a scanning angle range of a laser beam of a laser projector is provided. First, a photo sensor is disposed between first and second positions on a projection mirror. Then, a laser beam emitted from the laser projector scans back and forth between the first and second positions, so that the photo sensor receives the laser beam sequentially at first and second scanning time points to generate first and second sensing signals, respectively. If an actual time interval between the first and second sensing signals conforms to an expected time interval, an actual scanning angle range of the laser beam is determined as normal. If the actual time interval does not conform to the expected time interval, the actual scanning angle range of the laser beam is determined as abnormal and the laser projector stops emitting the laser beam. A laser projector is also provided.
    Type: Application
    Filed: January 22, 2013
    Publication date: June 19, 2014
    Applicant: LITE-ON IT CORPORATION
    Inventors: Chia-Tse Lin, Kai-Wen Cheng
  • Patent number: 8755529
    Abstract: A device for establishing network connection is disclosed, having a transmitting circuit, a receiving circuit, and a controller. The transmitting circuit, comprising a first scrambler having a plurality of first registers, transmits a first data scrambled by the first scrambler to a transmission line according to an oscillating signal generated by an oscillation circuit. The receiving circuit receives a second data scrambled by a second scrambler from the transmission line and comprises a descrambler having a plurality of second registers for descrambling the second data. The first and the second scramblers use the same scrambler generator polynomial. The controller compares at least one of the first data and the value of the first registers and at least one of the second data and the values of the second registers for configuring the oscillation circuit to adjust the frequency of the oscillating signal.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: June 17, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Liang-Wei Huang, Cheng-Han Lee, Yi-Huei Lei, Kai-Wen Cheng
  • Publication number: 20140157331
    Abstract: A channel scanning method for Digital Video Broadcasting—Satellite (DVB-S) signals is provided. The method includes: scanning a radio frequency (RF) signal according to a normal frequency step; when the Nth channel is detected, obtaining a difference between a low boundary of an Nth channel and a high boundary of an (N?1)th channel; and, when the difference is within a predetermined bandwidth range, scanning the RF signal between the high boundary of the (N?1)th channel and the low boundary of the Nth channel according to a narrow frequency step. The normal frequency step is greater than the narrow frequency step.
    Type: Application
    Filed: December 3, 2013
    Publication date: June 5, 2014
    Applicant: MStar Semiconductor, Inc.
    Inventors: Chu-Hsin Chang, Kai-Wen Cheng, Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Patent number: 8709267
    Abstract: Methods for patterning material layers, which may be implemented in forming integrated circuit device features, are disclosed. In an example, a method includes forming a first resist layer over a material layer; forming a second resist layer over the first resist layer; forming an opening that extends through the second resist layer and the first resist layer to expose the material layer, wherein the opening has a substantially constant width in the second resist layer and a tapered width in the first resist layer; and performing a tilt-angle deposition process to form a feature over the exposed material layer.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: April 29, 2014
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chwen Yu, Fei-Gwo Tsai, Kai-Wen Cheng
  • Patent number: 8675787
    Abstract: A circuit for detecting a predetermined symbol of a digital data stream includes a frequency shifter, a correlator, a filter and a decision unit. The frequency shifter performs inverse-frequency shifting upon a first data to generate a first frequency-shifted data. The correlator calculates correlation upon the first frequency-shifted data and a second data to generate a correlated data. The filter, coupled to the correlator, filters and the correlated data to generate a filtered correlated data according to a time-domain windowing length. The decision unit, coupled to the filter, determines the predetermined symbol from the digital data stream according to the filtered correlated data.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: March 18, 2014
    Assignee: MStar Semiconductor, Inc.
    Inventors: Kai-Wen Cheng, Ko-Yin Lai, Yi-Ying Liao, Tai-Lai Tung
  • Publication number: 20140048893
    Abstract: The present disclosure provides a semiconductor memory device. The device includes a pinning layer having an anti-ferromagnetic material and disposed over a first electrode; a pinned layer disposed over the pinning layer; a tunneling layer disposed over the pinned layer, a free layer disposed over the tunneling layer and a capping layer disposed over the free layer. The capping layer includes metal-oxide and metal-nitride materials.
    Type: Application
    Filed: August 16, 2012
    Publication date: February 20, 2014
    Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Kuo-Ming Wu, Kai-Wen Cheng, Cheng-Yuan Tsai, Chia-Shiung Tsai
  • Publication number: 20140001346
    Abstract: A detection method of an image projection device is disclosed. A projection beam is projected on a plurality of projection regions within a projection range, wherein the projection beam carries different features when the projection beam is projected on different projection regions. A reflected beam from the projection range is received and converted to an electrical signal. The feature existing in the electrical signal is analyzed. The projection region corresponding to the feature is determined to identify which of the projection regions is/are blocked by an object.
    Type: Application
    Filed: November 14, 2012
    Publication date: January 2, 2014
    Applicant: LITE-ON IT CORPORATION
    Inventors: Chun-Hung Chen, Kai-Wen Cheng
  • Publication number: 20130318557
    Abstract: An apparatus for detecting spectrum inversion includes a different correlator and a determining module. The differential correlator performs an odd-order differential correlation on an input signal and a known signal to generate a differential correlation result. When the input signal is determined as corresponding to a target signal of the known signal, the determining module detects spectrum inversion in the input signal according to the phase of the differential correlation result.
    Type: Application
    Filed: May 23, 2013
    Publication date: November 28, 2013
    Inventors: Kai-Wen Cheng, Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Publication number: 20130279554
    Abstract: An apparatus for correcting a phase error is provided. The apparatus includes an error estimating module and a correcting module. The error estimating module receives a phase-shift keying signal, and calculates a phase error according to the phase-shift keying signal, a plurality of known candidate signals and Bayesian estimation. The correcting module corrects the phase-shift keying signal according to the phase error.
    Type: Application
    Filed: September 13, 2012
    Publication date: October 24, 2013
    Applicant: MSTAR SEMICONDUCTOR, INC.
    Inventors: Kai-Wen Cheng, Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Patent number: 8565428
    Abstract: A network device for building up a network connection via a high-definition multimedia interface, includes a scrambler, a descrambler, a comparator and a control unit. The scrambler is utilized for generating a transmission signal according to a first seed. The descrambler is for decoding a receiving signal to generate a second seed. The comparator is for generating a comparing result according to the first seed and the second seed. The control unit is for controlling the network connection according to the comparing result.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: October 22, 2013
    Assignee: Realtek Semiconductor Corp.
    Inventors: Liang-Wei Huang, Shieh-Hsing Kuo, Chun-Hung Liu, Kai-Wen Cheng
  • Publication number: 20130258201
    Abstract: A signal processing apparatus includes an initial detecting module, a mixer, a symbol rate detecting module, a judging module and a correcting module. The initial detecting module determines an initial carrier frequency offset of an input signal according to a spectrum of the input signal. The mixer adjusts the input signal according to the initial carrier frequency offset to generate a frequency-compensated signal. The symbol rate detecting module determines a symbol rate of the input signal. The judging module judges whether the initial carrier frequency offset is correct according to the frequency-compensated signal. When a judgment result of the judging module is negative, the correcting module determines a corrected carrier frequency offset according to the symbol rate and the spectrum.
    Type: Application
    Filed: March 18, 2013
    Publication date: October 3, 2013
    Inventors: Chu-Hsin Chang, Kai-Wen Cheng, Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Patent number: 8547985
    Abstract: The disclosure is a network interface controller (NIC) capable of sharing buffers, which is coupled to a host and a network to make the network connection. The NIC includes a transmitting buffer, a transmitting controller, a receiving buffer, and a receiving controller. The transmitting controller controls the transmitting buffer to transmit the transmission data provided by the host to the network. The receiving controller controls the receiving buffer to transmit the reception data received from the network to the host, and determines a storage capacity of the receiving buffer. When the storage capacity is smaller than a set value, the receiving controller transmits a request signal to the transmitting controller, the transmitting controller generates a response signal according to the request signal and a status signal corresponding to the transmitting buffer, and the receiving controller controls whether reception data is stored in the transmitting buffer according to the response signal.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: October 1, 2013
    Assignee: Realtek Semiconductor Corp.
    Inventors: Kuo-Nan Yang, Yen-Hsu Shih, Chia-Ying Chiu, Kai-Wen Cheng
  • Publication number: 20130253867
    Abstract: A signal processing apparatus for receiving a spectral line of an original signal includes a starting point determining module, a searching module and a symbol rate determining module. The starting point determining module finds a maximum energy in the spectral line and determines at least one search starting point according to the maximum energy. From the at least one search starting point, the searching module searches along the spectral line towards a region with a lower energy for at least one minimum energy satisfying a predetermined condition. The symbol rate determining module determines a symbol rate of the original signal according to the at least one minimum energy.
    Type: Application
    Filed: September 13, 2012
    Publication date: September 26, 2013
    Applicant: MSTAR SEMICONDUCTOR, INC.
    Inventors: Chu-Hsin Chang, Kai-Wen Cheng, Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Patent number: 8542782
    Abstract: A circuit for detecting a digital data stream includes a first detecting circuit, a second detecting circuit and a decision unit. The digital data stream includes a predetermined symbol having a first data and a second data. The first detecting circuit detects a correlation between the second data and a first frequency-shifted data to generate a first correlated data; and the second detecting circuit detects a correlation between the second data and a second frequency-shifted data to generate a first correlated data, where the first frequency-shifted data and the second frequency-shifted data are generated by performing first frequency-shifting and second frequency-shifting upon the first data, respectively. The decision unit determines a signal status of the digital data stream according to the first and second correlated data.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: September 24, 2013
    Assignee: MStar Semiconductor, Inc.
    Inventors: Kai-Wen Cheng, Ko-Yin Lai, Yi-Ying Liao, Tai-Lai Tung