Patents by Inventor Wen-Chwan Chao

Wen-Chwan Chao 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: 8970788
    Abstract: A gain-determining method for grayscale white balance of a display apparatus comprising a panel is provided. The method first displays a white, a red, a green, and a blue images on the panel respectively and measures the chromatic values and luminance of the images. Next, the chromatic values and luminance of a target white image is inputted. Following, according to the measured chromatic values and luminance of the white, the red, the green and the blue images, a first set of color mixture ratios is calculated. Then, according to the chromatic values and luminance of the target white image and the chromatic values and luminance of the red, the green and the blue images, a second set of color mixture ratios is calculated. Finally, according to the first set and the second set of color mixture ratios, a red gain, a green gain and a blue gain are calculated.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: March 3, 2015
    Assignee: Marketech International Corp.
    Inventors: Wen-Chwan Chao, Yi-Sheng Yu, Hsu-Pin Kao
  • Patent number: 8294735
    Abstract: A method for automatically detecting and adjusting grayscale/white balance of a display comprises the steps of: detecting a chromaticity coordinate and a brightness of a present white color of the display by a detector; selecting a chromaticity coordinate of three primary colors of red, green, and blue in a known chromaticity space for automatically calculating a present mixing ratio of the three primary colors of red, green, and blue of the present white color of the display according to Grassman's Law of color mixture in colormetry; calculating a desired mixing ratio of three primary colors of red, green, and blue of an ideal white color under a predetermined color temperature; and comparing the present mixing ratio with the desired mixing ratio to obtain a proportion therebetween which is used as a set of gain values of the three primary colors of red, green of the display.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: October 23, 2012
    Assignee: Marketech International Corp.
    Inventors: Wen-Chwan Chao, Yi-Sheng Yu, Hsu-Pin Kao
  • Publication number: 20080117334
    Abstract: A gain-determining method for grayscale white balance of a display apparatus comprising a panel is provided. The method first displays a white, a red, a green, and a blue images on the panel respectively and measures the chromatic values and luminance of the images. Next, the chromatic values and luminance of a target white image is inputted. Following, according to the measured chromatic values and luminance of the white, the red, the green and the blue images, a first set of color mixture ratios is calculated. Then, according to the chromatic values and luminance of the target white image and the chromatic values and luminance of the red, the green and the blue images, a second set of color mixture ratios is calculated. Finally, according to the first set and the second set of color mixture ratios, a red gain, a green gain and a blue gain are calculated.
    Type: Application
    Filed: August 20, 2007
    Publication date: May 22, 2008
    Inventors: Wen-Chwan Chao, Yi-Sheng Yu, Hsu-Pin Kao
  • Publication number: 20080055339
    Abstract: A method for automatically detecting and adjusting grayscale/white balance of a display comprises the steps of: detecting a chromaticity coordinate and a brightness of a present white color of the display by a detector; selecting a chromaticity coordinate of three primary colors of red, green, and blue in a known chromaticity space for automatically calculating a present mixing ratio of the three primary colors of red, green, and blue of the present white color of the display according to Grassman's Law of color mixture in colormetry; calculating a desired mixing ratio of three primary colors of red, green, and blue of an ideal white color under a predetermined color temperature; and comparing the present mixing ratio with the desired mixing ratio to obtain a proportion therebetween which is used as a set of gain values of the three primary colors of red, green of the display.
    Type: Application
    Filed: December 22, 2006
    Publication date: March 6, 2008
    Applicant: MARKETECH INTERNATIONAL CORP.
    Inventors: Wen-Chwan Chao, Yi-Sheng Yu, Hsu-Pin Kao