Patents by Inventor Weizhuang W. Xin

Weizhuang W. Xin 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: 8599915
    Abstract: First information is received at a first pulse width modulation (PWM) module responsive to a chip select signal being asserted at a chip select input of a communication bus of the first PWM module during a first time. The first information is latched at a control register of the first PWM module in response to a first logic transition of the chip select signal. A first PWM signal is provided at a first output of the first PWM module beginning a predetermined amount of time after the first logic transition of the chip select signal, the first PWM signal generated by the first PWM module based upon the first information.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: December 3, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Bin Zhao, Jack W. Cornish, Andrew M. Kameya, Weizhuang W. Xin
  • Patent number: 8279144
    Abstract: Disclosed are example techniques for frame-based power management in a light emitting diode (LED) system having a plurality of LED strings. A voltage source provides an output voltage to drive the LED strings. An LED driver generates a frame timing reference representative of the frame rate or display timing of a series of image frames to be displayed via the LED system. An update reference is generated from the frame timing reference. The LED driver monitors one or more operating parameters of the LED system. In response to update triggers marked by the update reference, the LED driver adjusts the output voltage of the voltage source based on the status of each of the one or more monitored operating parameters (either from the previous update period or determined in response to the update trigger), thereby synchronizing the updating of the output voltage to the frame rate (or a virtual approximation of the frame rate) of the video being displayed.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: October 2, 2012
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Bin Zhao, Jack W. Cornish, Brian B. Horng, Andrew M Kameya, Jan Krellner, Kenneth C. Kwok, Victor K. Lee, Weizhuang W. Xin
  • Publication number: 20120207205
    Abstract: First information is received at a first pulse width modulation (PWM) module responsive to a chip select signal being asserted at a chip select input of a communication bus of the first PWM module during a first time. The first information is latched at a control register of the first PWM module in response to a first logic transition of the chip select signal. A first PWM signal is provided at a first output of the first PWM module beginning a predetermined amount of time after the first logic transition of the chip select signal, the first PWM signal generated by the first PWM module based upon the first information.
    Type: Application
    Filed: February 11, 2011
    Publication date: August 16, 2012
    Applicant: FREESCALE SEMICONDUCTOR, INC.
    Inventors: Bin Zhao, Jack W. Cornish, Andrew M. Kameya, Weizhuang W. Xin
  • Patent number: 8035315
    Abstract: Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive a plurality of LED strings. An LED driver implements a feedback mechanism to monitor the tail voltages of the active LED strings to identify the minimum tail voltage and adjust the output voltage of the voltage source based on the lowest tail voltage. A loop calibration module of the LED driver calibrates the feedback mechanism of the LED driver based on a relationship between a digital code value used to generate a particular output voltage and another digital code value generated based on the minimum tail voltage resulting from the particular output voltage.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: October 11, 2011
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Bin Zhao, Jack W. Cornish, Brian B. Horng, Andrew M. Kameya, Jan Krellner, Kenneth C. Kwok, Victor K. Lee, Weizhuang W. Xin
  • Publication number: 20100156315
    Abstract: Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive a plurality of LED strings. An LED driver implements a feedback mechanism to monitor the tail voltages of the active LED strings to identify the minimum tail voltage and adjust the output voltage of the voltage source based on the lowest tail voltage. A loop calibration module of the LED driver calibrates the feedback mechanism of the LED driver based on a relationship between a digital code value used to generate a particular output voltage and another digital code value generated based on the minimum tail voltage resulting from the particular output voltage.
    Type: Application
    Filed: December 22, 2008
    Publication date: June 24, 2010
    Applicant: Freescale Semiconductor, Inc.
    Inventors: Bin Zhao, Jack W. Cornish, Brian B. Horng, Andrew M. Kameya, Jan Krellner, Kenneth C. Kwok, Victor K. Lee, Weizhuang W. Xin
  • Publication number: 20100026203
    Abstract: Disclosed are example techniques for frame-based power management in a light emitting diode (LED) system having a plurality of LED strings. A voltage source provides an output voltage to drive the LED strings. An LED driver generates a frame timing reference representative of the frame rate or display timing of a series of image frames to be displayed via the LED system. An update reference is generated from the frame timing reference. The LED driver monitors one or more operating parameters of the LED system. In response to update triggers marked by the update reference, the LED driver adjusts the output voltage of the voltage source based on the status of each of the one or more monitored operating parameters (either from the previous update period or determined in response to the update trigger), thereby synchronizing the updating of the output voltage to the frame rate (or a virtual approximation of the frame rate) of the video being displayed.
    Type: Application
    Filed: July 31, 2008
    Publication date: February 4, 2010
    Applicant: Freescale Semiconductor, Inc.
    Inventors: Bin Zhao, Jack W. Cornish, Brian B. Horng, Andrew M. Kameya, Jan Krellner, Kenneth C. Kwok, Victor K. Lee, Weizhuang W. Xin