Patents by Inventor Ching Hsiang Yang

Ching Hsiang Yang 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: 10444616
    Abstract: A rear projection screen includes a transparent substrate, a light absorbing film and a first diffusion film in sequence from a projection side to a viewer side. The transparent substrate includes a first surface and a second surface opposite to each other, the first surface faces the projection side, the second surface faces the viewer side, and the first surface is disposed with a plurality of prism structures protruding toward the projection side. The transparent substrate is located between the light absorbing film and the prism structures. The light absorbing film includes a plurality of light absorbing structures arranged at intervals from each other, and the distribution density of the prism structures is greater than that of the light absorbing structures. The light absorbing film is located between the first diffusion film and the transparent substrate. The rear projection screen through the above-mentioned design has a good image display quality.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: October 15, 2019
    Assignee: NANO PRECISION TAIWAN LIMITED
    Inventors: Ching-Hsiang Li, Fang-Hsuan Su, Shu-Ping Yang, Chi-Tang Hsieh, Fu-Chiang Hsu, Hung-Ta Chien
  • Publication number: 20190227424
    Abstract: A rear projection screen includes a prism film, a first diffusion layer, a second diffusion layer and a light absorbing film sequentially disposed along a first direction. The prism film includes a first light-transmitting substrate and prism structures, wherein the prism structures are disposed on a surface of the first light-transmitting substrate away from the first diffusion layer. The prism structures receive an image beam and guide the image beam to be transmitted along the first direction. The first diffusion layer and the second diffusion layer have different refractive indexes. There are light-absorbing structures disposed in the light absorbing film, and the light-absorbing structures are arranged spaced apart from each other.
    Type: Application
    Filed: January 23, 2019
    Publication date: July 25, 2019
    Inventors: CHING-HSIANG LI, SHU-PING YANG, FANG-HSUAN SU, CHI-TANG HSIEH, FU-CHIANG HSU
  • Patent number: 8411879
    Abstract: A speaker driver circuit driven by positive and negative voltages, comprising: at least one operational amplifier providing an output to a headphone speaker, and a voltage converter receiving a supplied voltage (VDD), generating r-fold positive and negative voltages (r·VDD and ?r·VDD, wherein r is any positive real number except 1) according to the supplied voltage, and supplying the positive and negative voltages to the operational amplifier for its high and low operation voltage levels respectively.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: April 2, 2013
    Assignee: Richtek Technology Corporation
    Inventors: Jwin-Yen Guo, Ching-Hsiang Yang
  • Patent number: 8373404
    Abstract: A flyback voltage converter includes a transformer having a primary winding and a secondary winding, a switch serially connected to the primary winding for being switched to produce a current in the secondary winding, and a negative lock loop to adjust the peak value of the current in the secondary winding according to a current conduction time during which the current in the secondary winding is higher than a current threshold, such that the peak value of the current in the secondary winding will be in inverse proportion to the time.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: February 12, 2013
    Assignee: Richtek Technology Corp.
    Inventors: Chao-Hsuan Chuang, Ching-Hsiang Yang, Cheng-Hsuan Fan, Hung-Che Chou
  • Patent number: 8159294
    Abstract: The present invention discloses a multi-voltage headphone driver circuit comprising: at least one operational amplifier having an output supplied to a headphone speaker, the operational amplifier receiving a first power supply as its high operation voltage; a charge pump receiving a second power supply to generate a negative voltage corresponding to the second power supply in magnitude; and an m-fold circuit multiplying the negative voltage by m and providing the result to the operational amplifier as a low operation voltage thereof, wherein m is a real number.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: April 17, 2012
    Assignee: Richtek Technology Corporaton
    Inventors: Jwin-Yen Guo, Ching-Hsiang Yang
  • Patent number: 7991172
    Abstract: The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative half-voltage (VDD/2 and ?VDD/2) based on the supply voltage, and supplying the positive half-voltage and negative half-voltage as high and low operation levels to the at least one operational amplifier.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: August 2, 2011
    Assignee: Richtek Technology Corporation
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Shui-Mu Lin, Chih-Ping Tan
  • Patent number: 7907377
    Abstract: For protecting a power system, two or three of over current, thermal and under voltage protection circuits are integrated as one protection circuit but operate independently, and one or more protection points thereof are adjusted dynamically in response to detected condition of the power system. Specifically, using voltage and current conditions in the power system to modify the over current protection and the thermal protection maximizes the performance of the power system and covers the process bias in the circuits.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: March 15, 2011
    Assignee: Richtek Technology Corp.
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Patent number: 7728571
    Abstract: The present invention discloses a load-dependent frequency jittering circuit, comprising: a load condition detection circuit for receiving a switching signal and generating an output according to a load condition; a number generator for receiving the output of the load condition detection circuit and generating a number; a digital to analog converter for converting the output of the number generator to an analog signal; and an oscillator for generating a jittered frequency according to the output of the digital to analog converter.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: June 1, 2010
    Assignee: Richtek Technology Corporation, R.O.C.
    Inventors: Chao-Hsuan Chuang, Cheng-Hsuan Fan, Hung-Che Chou, Ching-Hsiang Yang
  • Publication number: 20100117617
    Abstract: A flyback voltage converter includes a transformer having a primary winding and a secondary winding, a switch serially connected to the primary winding for being switched to produce a current in the secondary winding, and a negative lock loop to adjust the peak value of the current in the secondary winding according to a current conduction time during which the current in the secondary winding is higher than a current threshold, such that the peak value of the current in the secondary winding will be in inverse proportion to the time.
    Type: Application
    Filed: November 6, 2009
    Publication date: May 13, 2010
    Inventors: Chao-Hsuan Chuang, Ching-Hsiang Yang, Cheng-Hsuan Fan, Hung-Che Chou
  • Patent number: 7714551
    Abstract: A linear voltage regulator comprises a transistor for converting a supply voltage to an output voltage. By directly monitoring the supply voltage and thereby rapidly responding when the supply voltage suffers a ripple, the linear voltage regulator enhances the stability of the output voltage.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: May 11, 2010
    Assignee: Richtek Technology Corp.
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Publication number: 20090285416
    Abstract: A speaker driver circuit driven by positive and negative voltages, comprising: at least one operational amplifier providing an output to a headphone speaker, and a voltage converter receiving a supplied voltage (VDD), generating r-fold positive and negative voltages (r·VDD and ?r·VDD, wherein r is any positive real number except 1) according to the supplied voltage, and supplying the positive and negative voltages to the operational amplifier for its high and low operation voltage levels respectively.
    Type: Application
    Filed: July 21, 2009
    Publication date: November 19, 2009
    Inventors: Jwin-Yen Guo, Ching-Hsiang Yang
  • Patent number: 7619396
    Abstract: Time-sharing technique is used for power conversion to improve the thermal dissipation thereof. In a power supply arrangement to provide a supply voltage to a load, a plurality of linear regulators are so switched that each time only one of them is enabled to convert an input voltage to the supply voltage, thereby each of them suffering less thermal dissipation.
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: November 17, 2009
    Assignee: Richtek Technology Corp.
    Inventors: Chao-Hsuan Chuang, Cheng-Hsuan Fan, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Publication number: 20090279713
    Abstract: The present invention discloses a multi-voltage headphone driver circuit comprising: at least one operational amplifier having an output supplied to a headphone speaker, the operational amplifier receiving a first power supply as its high operation voltage; a charge pump receiving a second power supply to generate a negative voltage corresponding to the second power supply in magnitude; and an m-fold circuit multiplying the negative voltage by m and providing the result to the operational amplifier as a low operation voltage thereof, wherein m is a real number.
    Type: Application
    Filed: July 21, 2009
    Publication date: November 12, 2009
    Inventors: Jwin-Yen Guo, Ching-Hsiang Yang
  • Patent number: 7570121
    Abstract: A frequency jittering control circuit wherein by means of the characteristics of a PLL whose input switches between different frequencies, the output frequency of the PLL swings between the different frequencies to achieve the desired frequency jittering.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: August 4, 2009
    Assignee: Richtek Technology Corporation
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Patent number: 7535690
    Abstract: For protecting a power system, two or three of over current, thermal and under voltage protection circuits are integrated as one protection circuit but operate independently, and one or more protection points thereof are adjusted dynamically in response to detected condition of the power system. Specifically, using voltage and current conditions in the power system to modify the over current protection and the thermal protection maximizes the performance of the power system and covers the process bias in the circuits.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: May 19, 2009
    Assignee: Richtek Technology Corp.
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Publication number: 20090115391
    Abstract: The present invention discloses a load-dependent frequency jittering circuit, comprising: a load condition detection circuit for receiving a switching signal and generating an output according to a load condition; a number generator for receiving the output of the load condition detection circuit and generating a number; a digital to analog converter for converting the output of the number generator to an analog signal; and an oscillator for generating a jittered frequency according to the output of the digital to analog converter.
    Type: Application
    Filed: November 6, 2007
    Publication date: May 7, 2009
    Inventors: Chao-Hsuan Chuang, Cheng-Hsuan Fan, Hung-Che Chou, Ching-Hsiang Yang
  • Publication number: 20090116160
    Abstract: For protecting a power system, two or three of over current, thermal and under voltage protection circuits are integrated as one protection circuit but operate independently, and one or more protection points thereof are adjusted dynamically in response to detected condition of the power system. Specifically, using voltage and current conditions in the power system to modify the over current protection and the thermal protection maximizes the performance of the power system and covers the process bias in the circuits.
    Type: Application
    Filed: January 7, 2009
    Publication date: May 7, 2009
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Publication number: 20080298605
    Abstract: The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative half-voltage (VDD/2 and ?VDD/2) based on the supply voltage, and supplying the positive half-voltage and negative half-voltage as high and low operation levels to the at least one operational amplifier.
    Type: Application
    Filed: May 31, 2007
    Publication date: December 4, 2008
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Shui-Mu Lin, Chih-Ping Tan
  • Publication number: 20080224782
    Abstract: A frequency jittering control circuit wherein by means of the characteristics of a PLL whose input switches between different frequencies, the output frequency of the PLL swings between the different frequencies to achieve the desired frequency jittering.
    Type: Application
    Filed: June 25, 2007
    Publication date: September 18, 2008
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan
  • Publication number: 20070188154
    Abstract: A linear voltage regulator comprises a transistor for converting a supply voltage to an output voltage. By directly monitoring the supply voltage and thereby rapidly responding when the supply voltage suffers a ripple, the linear voltage regulator enhances the stability of the output voltage.
    Type: Application
    Filed: February 12, 2007
    Publication date: August 16, 2007
    Inventors: Cheng-Hsuan Fan, Chao-Hsuan Chuang, Hung-Che Chou, Ching-Hsiang Yang, Chih-Ping Tan