Patents by Inventor CHUNG-HAN CHENG

CHUNG-HAN 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).

  • Operating method for a fingerprint sensing device and fingerprint sensing system
    Patent number: 10121048
    Abstract: A fingerprint sensing system has a fingerprint sensing device and a power supply circuit. The fingerprint sensing device has a high-voltage input terminal and a low-voltage input terminal. During scan phases of the fingerprint sensing device, the power supply circuit provides a first voltage to the high voltage input terminal and provides a second voltage to the low voltage input terminal. During the read phases of the fingerprint sensing device, the power supply circuit provides a third voltage to the high voltage input terminal and provides a fourth voltage to the low voltage input terminal. A first voltage difference is between the first voltage and the second voltage. A second voltage difference is between the third voltage and the fourth voltage. The first voltage difference is greater than the second voltage difference.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: November 6, 2018
    Assignee: ELAN MICROELECTRONICS CORPORATION
    Inventors: Chao-Chi Yang, Jui-Che Lin, Tung-An Yao, Chung-Han Cheng, Chung-An Tang
  • OPERATING METHOD FOR A FINGERPRINT SENSING DEVICE AND FINGERPRINT SENSING SYSTEM
    Publication number: 20180032779
    Abstract: A fingerprint sensing system has a fingerprint sensing device and a power supply circuit. The fingerprint sensing device has a high-voltage input terminal and a low-voltage input terminal. During scan phases of the fingerprint sensing device, the power supply circuit provides a first voltage to the high voltage input terminal and provides a second voltage to the low voltage input terminal. During the read phases of the fingerprint sensing device, the power supply circuit provides a third voltage to the high voltage input terminal and provides a fourth voltage to the low voltage input terminal. A first voltage difference is between the first voltage and the second voltage. A second voltage difference is between the third voltage and the fourth voltage. The first voltage difference is greater than the second voltage difference.
    Type: Application
    Filed: January 4, 2017
    Publication date: February 1, 2018
    Applicant: ELAN MICROELECTRONICS CORPORATION
    Inventors: Chao-Chi YANG, Jui-Che LIN, Tung-An YAO, Chung-Han CHENG, Chung-An TANG
  • CONTROL METHOD AND ELECTRONIC STYLUS FOR TOUCH INPUT TO A CAPACITIVE TOUCHPAD MODULE
    Publication number: 20140035870
    Abstract: An electronic stylus emits an excitation signal to apply to a trace of a capacitive touchpad module near a touch point when the electronic stylus touches the capacitive touchpad module, so as to change a waveform of a charging/discharging signal in the trace, and depending on the waveform variation, the capacitive touchpad module can identify the touch point.
    Type: Application
    Filed: September 9, 2013
    Publication date: February 6, 2014
    Applicant: Elan Microelectronic Corporation
    Inventors: I-Hau YEH, Chi-Tein YEH, Tsun-Min WANG, Chun-Chung HUANG, Chung-Han CHENG, Hung-Ming HUANG
  • Electronic stylus, capacitive touchpad module, and apparatus for touch input
    Patent number: 8564553
    Abstract: An electronic stylus emits an excitation signal to apply to a trace of a capacitive touchpad module near a touch point when the electronic stylus touches the capacitive touchpad module, so as to change a waveform of a charging/discharging signal in the trace, and depending on the waveform variation, the capacitive touchpad module can identify the touch point.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: October 22, 2013
    Assignee: Elan Microelectronics Corporation
    Inventors: I-Hau Yeh, Chi-Tein Yeh, Tsun-Min Wang, Chun-Chung Huang, Chung-Han Cheng, Hung-Ming Huang
  • ELECTRONIC STYLUS, CAPACITIVE TOUCHPAD MODULE, AND APPARATUS FOR TOUCH INPUT
    Publication number: 20100170726
    Abstract: An electronic stylus emits an excitation signal to apply to a trace of a capacitive touchpad module near a touch point when the electronic stylus touches the capacitive touchpad module, so as to change a waveform of a charging/discharging signal in the trace, and depending on the waveform variation, the capacitive touchpad module can identify the touch point.
    Type: Application
    Filed: January 4, 2010
    Publication date: July 8, 2010
    Applicant: ELAN MICROELECTRONICS CORPORATION
    Inventors: I-HAU YEH, CHI-TEIN YEH, TSUN-MIN WANG, CHUN-CHUNG HUANG, CHUNG-HAN CHENG, HUNG-MING HUANG