Patents by Inventor Ya-Hsien Chang

Ya-Hsien Chang 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: 12149264
    Abstract: A device includes a phase detector circuit, a charge pump circuit, a sample and hold circuit, a comparator, and a controller. The phase detector circuit detects a clock skew between a reference signal and an input signal. The charge pump circuit translates the clock skew into a voltage. A sample and hold circuit samples the voltage, at a first time, and maintain the sampled voltage until a second time. The comparator (i) detects a loop gain associated with the input signal based on the sampled voltage and the voltage at the second time and (ii) outputs a loop gain signal for adjustment of the input signal. The controller is coupled to the phase detector, the comparator, and the sample and hold circuit. The controller generates a plurality of control signals for automatically controlling operation of the phase detector, the comparator, and the sample and hold circuit.
    Type: Grant
    Filed: June 6, 2023
    Date of Patent: November 19, 2024
    Assignee: Taiwan Semiconductor Manufacturing Company Limited
    Inventors: Mao-Hsuan Chou, Ya-Tin Chang, Ruey-Bin Sheen, Chih-Hsien Chang
  • Publication number: 20240364349
    Abstract: Digital delay lock circuits and methods for operating digital delay lock circuits are provided. A phase detector is configured to receive first and second clock signals and generate a digital signal indicating a relationship between a phase of the first clock signal and a phase of the second clock signal. A phase accumulator circuit is configured to receive the digital signal and generate a phase signal based on values of the digital signal over multiple clock cycles. A decoder is configured to receive the phase signal and generate a digital control word based on the phase signal. A delay element is configured to receive the digital control word. The delay element is further configured to change the relationship between the phase of the first clock signal and the phase of the second clock signal by modifying the phase of the second clock signal according to the digital control word.
    Type: Application
    Filed: July 9, 2024
    Publication date: October 31, 2024
    Inventors: Tsung-Hsien Tsai, Ya-Tin Chang, Ruey-Bin Sheen, Chih-Hsien Chang, Cheng-Hsiang Hsieh
  • Publication number: 20240322093
    Abstract: A light-emitting module is provided. The light-emitting module includes a substrate and n number of light-emitting elements disposed on the substrate. The n number of light-emitting elements have n?1 number of first intervals. The n?1 number of first intervals have a first standard deviation, wherein n is greater than or equal to 3. The light-emitting module further includes a light-shielding structure which is disposed on the n number of light-emitting elements and has n number of light-emitting holes. The n number of light-emitting holes correspond to the n number of light-emitting elements, respectively, and have n?1 number of second intervals. The n?1 number of second intervals have a second standard deviation, wherein the first standard deviation is greater than the second standard deviation.
    Type: Application
    Filed: March 20, 2024
    Publication date: September 26, 2024
    Inventors: Ya-Hsien CHANG, Wei-Chiang HU, Bo-Yu KO, Chieh-Chun CHANG, Tzu-Yuan LIN, Ching-Yi CHEN
  • Patent number: 12057846
    Abstract: Digital delay lock circuits and methods for operating digital delay lock circuits are provided. A phase detector is configured to receive first and second clock signals and generate a digital signal indicating a relationship between a phase of the first clock signal and a phase of the second clock signal. A phase accumulator circuit is configured to receive the digital signal and generate a phase signal based on values of the digital signal over multiple clock cycles. A decoder is configured to receive the phase signal and generate a digital control word based on the phase signal. A delay element is configured to receive the digital control word. The delay element is further configured to change the relationship between the phase of the first clock signal and the phase of the second clock signal by modifying the phase of the second clock signal according to the digital control word.
    Type: Grant
    Filed: April 17, 2023
    Date of Patent: August 6, 2024
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Tsung-Hsien Tsai, Ya-Tin Chang, Ruey-Bin Sheen, Chih-Hsien Chang, Cheng-Hsiang Hsieh
  • Patent number: 8228272
    Abstract: A backlight device for providing backlighting to a liquid crystal display panel displaying a video image comprising a plurality of light emitting devices for providing backlighting to a liquid crystal display panel, a controller unit for receiving a video image and dividing the video image into a plurality of sub-images wherein each sub-image corresponds to at least one light emitting device, and for generating driving signals of each light emitting device according to grayscale level characteristics of at least one sub-image.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: July 24, 2012
    Assignee: Hong Kong Applied Science And Technlogy Research Institute Company Limited
    Inventors: Huajun Peng, Ya-Hsien Chang, Chen Jung Tsai
  • Patent number: 8109650
    Abstract: A light emitting diode (LED) illuminant system, a manufacture method thereof, and a backlight module using the same are provided. The LED illuminant system includes a plurality of white light illuminants and at least one green light illuminant mixed in the white light illuminants. A light power ratio of the green light illuminant to the white light illuminants is in between ? to 1/20. The color temperature of the whole illuminant system will be enhanced to a certain extent by mixing the green light illuminant and the white light illuminants. The manufacture method includes the following steps: obtaining a transmission spectrum of the white light illuminants; analyzing the transmission spectrum to determine n supplemental amount of a green light; and disposing at least one green illuminant in accordance with the supplemental amount of the green light.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: February 7, 2012
    Assignee: AU Optronics Corporation
    Inventors: Ya-Hsien Chang, Hsin-Wu Lin
  • Patent number: 7950814
    Abstract: A backlight module includes an optical film set and a plurality of light source sets having a first light source and a second light source. The first light source generates a first chromaticity light while the second light source generates a second chromaticity light. The first chromaticity light mixes with the second chromaticity light in the space between the light source sets and the optical film set and then enters the optical film set. The first chromaticity light and the second chromaticity light have their own spectrum and both spectra fall into a first color region of the CIE 1931 color space. Within the first color region, the spectrum of the first chromaticity light is close to a second color region while the spectrum of the second chromaticity light is close to a third color region.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: May 31, 2011
    Assignee: AU Optronics Corporation
    Inventors: Ya-Hsien Chang, Yu-Kai Lin
  • Patent number: 7935981
    Abstract: A light emitting diode (LED) package includes a carrier, an LED chip, an encapsulant, a plurality of phosphor particles, and a plurality of anti-humidity particles. The LED chip is disposed on and electrically connected to the carrier. The encapsulant encapsulates the LED chip. The phosphor particles and the anti-humidity particles are distributed within the encapsulant. A first light emitted from the LED chip excites the phosphor particles to emit a second light. Some of the anti-humidity particles are adhered onto a surface of the phosphor particles, while the other anti-humidity particles are not adhered onto the surface of the phosphor particles. The anti-humidity particles absorb H2O so as to avoid H2O from being reacted with the phosphor particles. The LED package of the present application has favorable water resistance.
    Type: Grant
    Filed: July 6, 2009
    Date of Patent: May 3, 2011
    Assignee: Lextar Electronics Corp.
    Inventors: Yu-Chun Lee, Ya-Hsien Chang, Cheng-Ta Kuo
  • Patent number: 7922362
    Abstract: A circuit board assembly and a backlight module comprising the circuit board assembly are provided. The circuit board assembly has a first surface and a second surface opposite to the first surface, and further comprises at least one laminate, a first conductive wiring structure and a coating. The first conductive wiring structure is formed on the first surface. The coating is formed on the coating area of the second surface, wherein the coating can conduct heat and provide electric insulation. Thus, the circuit board assembly is adapted to outwardly conduct heat from the laminate through the second surface and to promote the heat dissipation efficiency of the circuit board assembly.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: April 12, 2011
    Assignee: Au Optronics Corp.
    Inventors: Yu-Kai Lin, Ya-hsien Chang
  • Publication number: 20100237367
    Abstract: A light emitting diode (LED) package includes a carrier, an LED chip, an encapsulant, a plurality of phosphor particles, and a plurality of anti-humidity particles. The LED chip is disposed on and electrically connected to the carrier. The encapsulant encapsulates the LED chip. The phosphor particles and the anti-humidity particles are distributed within the encapsulant. A first light emitted from the LED chip excites the phosphor particles to emit a second light. Some of the anti-humidity particles are adhered onto a surface of the phosphor particles, while the other anti-humidity particles are not adhered onto the surface of the phosphor particles. The anti-humidity particles absorb H2O so as to avoid H2O from being reacted with the phosphor particles. The LED package of the present application has favorable water resistance.
    Type: Application
    Filed: July 6, 2009
    Publication date: September 23, 2010
    Applicant: Lextar Electronics Corp.
    Inventors: Yu-Chun Lee, Ya-Hsien Chang, Cheng-Ta Kuo
  • Patent number: 7671542
    Abstract: The present invention relates to a light emitting diode (LED) backlight having a plurality of LED strips, in which driving current supplied to each of the plurality of LED strips is adjusted according to measured differences in chromaticity coordinates between the actual light chromaticity and brightness output by each LED strip and a desired light chromaticity and brightness of each LED so that the LED backlight generates light of a desired color with a uniform brightness, and methods of operating the same.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: March 2, 2010
    Assignee: AU Optronics Corporation
    Inventors: Ya-Hsien Chang, Jyh-Haur Huang
  • Publication number: 20090290339
    Abstract: A light emitting diode (LED) illuminant system, a manufacture method thereof, and a backlight module using the same are provided. The LED illuminant system includes a plurality of white light illuminants and at least one green light illuminant mixed in the white light illuminants. A light power ratio of the green light illuminant to the white light illuminants is in between 1/5 to 1/20. The color temperature of the whole illuminant system will be enhanced to a certain extent by mixing the green light illuminant and the white light illuminants. The manufacture method includes the following steps: obtaining a transmission spectrum of the white light illuminants; analyzing the transmission spectrum to determine n supplemental amount of a green light; and disposing at least one green illuminant in accordance with the supplemental amount of the green light.
    Type: Application
    Filed: May 20, 2009
    Publication date: November 26, 2009
    Applicant: AU OPTRONICS CORPORATION
    Inventors: Ya-Hsien Chang, Hsin-Wu Lin
  • Patent number: D634283
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: March 15, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D634284
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: March 15, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D634285
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: March 15, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D634286
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: March 15, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D637980
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: May 17, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D637981
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: May 17, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D638378
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: May 24, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang
  • Patent number: D638808
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: May 31, 2011
    Assignee: Lextar Electronics Corporation
    Inventors: Bo-Yu Ko, Ya-Hsien Chang, Chun-Wei Wang