Patents by Inventor Chen-Song Yen

Chen-Song Yen 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).

  • Digital-to-analog converter
    Patent number: 7474245
    Abstract: A digital-to-analog converter outputting an output analog voltage according to an N-bit digital signal is provided. The digital-to-analog converter includes a first and a second resistor strings, a first and a second select units. The first resistor string is connected between a first and a second power supply voltages to generate a first group of reference voltages. The first select unit selects two reference voltages out of the first group according to M most significant bits of the N-bit digital signal. The second resistor string is connected between the selected reference voltages to generate a second group of reference voltages between the selected reference voltages. The second select unit selects one reference voltage out of the second group as the output analog voltage according to the N-M least significant bits of the N-bit digital signal.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: January 6, 2009
    Assignee: Himax Technologies Limited
    Inventors: Hui-Min Wang, Chen-Song Yen, Chin-Tien Chang, Chuan-Che Lee
  • Digital-to-Analog Converter for a source driver of a liquid crystal display
    Patent number: 7327299
    Abstract: A DAC has an N-bit R-string DAC section and an (M-N)-bit interpolation DAC section. The N-bit R-string DAC section has a plurality of resistors and a 2-of-N selector. The resistors are electrically connected in series to provide a plurality of voltage levels. The 2-of-N selector is coupled to the series-connected resistors, and is arranged to select two neighboring voltage levels according to an N-bit MSB subword. The (M-N)-bit interpolation DAC section is coupled to the N-bit R-string DAC section, and is arranged to interpolate an analog output signal from the two neighboring voltage levels according to an (M-N)-bit LSB subword.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: February 5, 2008
    Assignee: Himax Technologies Limited
    Inventors: Chen-Song Yen, Tsung-Yu Wu, Ying-Lieh Chen, Lin-Kai Bu
  • Digital-to-analog converter
    Patent number: 7161517
    Abstract: A DAC has an N-bit R-string DAC section and an (M-N)-bit interpolation DAC section. The N-bit R-string DAC section has a plurality of resistors and a 2-of-N selector. The resistors are electrically connected in series to provide a plurality of voltage levels. The 2-of-N selector is coupled to the series-connected resistors, and is arranged to select two neighboring voltage levels according to an N-bit MSB subword. The (M-N)-bit interpolation DAC section is coupled to the N-bit R-string DAC section, and is arranged to interpolate an analog output signal from the two neighboring voltage levels according to an (M-N)-bit LSB subword.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: January 9, 2007
    Assignee: Himax Technologies, Inc.
    Inventors: Chen-Song Yen, Tsung-Yu Wu, Ying-Lieh Chen, Lin-Kai Bu
  • DIGITAL-TO-ANALOG CONVERTER
    Publication number: 20070001883
    Abstract: A DAC has an N-bit R-string DAC section and an (M-N)-bit interpolation DAC section. The N-bit R-string DAC section has a plurality of resistors and a 2-of-N selector. The resistors are electrically connected in series to provide a plurality of voltage levels. The 2-of-N selector is coupled to the series-connected resistors, and is arranged to select two neighboring voltage levels according to an N-bit MSB subword. The (M-N)-bit interpolation DAC section is coupled to the N-bit R-string DAC section, and is arranged to interpolate an analog output signal from the two neighboring voltage levels according to an (M-N)-bit LSB subword.
    Type: Application
    Filed: June 29, 2005
    Publication date: January 4, 2007
    Applicant: HIMAX TECHNOLOGIES, INC.
    Inventors: Chen-Song Yen, Tsung-Yu Wu, Ying-Lieh Chen, Lin-Kai Bu
  • Digital-to-Analog Converter
    Publication number: 20070001885
    Abstract: A DAC has an N-bit R-string DAC section and an (M-N)-bit interpolation DAC section. The N-bit R-string DAC section has a plurality of resistors and a 2-of-N selector. The resistors are electrically connected in series to provide a plurality of voltage levels. The 2-of-N selector is coupled to the series-connected resistors, and is arranged to select two neighboring voltage levels according to an N-bit MSB subword. The (M-N)-bit interpolation DAC section is coupled to the N-bit R-string DAC section, and is arranged to interpolate an analog output signal from the two neighboring voltage levels according to an (M-N)-bit LSB subword.
    Type: Application
    Filed: August 25, 2006
    Publication date: January 4, 2007
    Applicant: HIMAX TECHNOLOGIES, INC.
    Inventors: Chen-Song Yen, Tsung-Yu Wu, Ying-Lieh Chen, Lin-Kai Bu