Patents by Inventor Gang Chang

Gang 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: 10482820
    Abstract: A method of compensating luminance of an organic light-emitting diode (OLED) operated with a transistor in a pixel cell of a display panel includes measuring a first parameter of the transistor and a parameter of the OLED, and generating a lookup table accordingly; converting original display data to target display data according to the lookup table; outputting the target display data to the pixel cell; and compensating a second parameter of the transistor when the target display data is received by the pixel cell.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: November 19, 2019
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Hua-Gang Chang, Hsueh-Yen Yang, Shang-Yu Su, Feng-Ting Pai
  • Patent number: 10453368
    Abstract: An apparatus and a method for sensing a display panel are provided. The apparatus includes a source driving circuit and a sensing circuit. The source driving circuit is coupled to data lines to drive the pixel circuits according to a display period comprising frame periods. The sensing circuit is coupled to a plurality of pixel circuits. The sensing circuit senses characteristics of the pixel circuits in the test data periods of the display period. The test data periods are periodically arranged in the display period. In each of the test data periods, a corresponding pixel circuit receives test data, and the sensing circuit senses the electrical characteristic of the corresponding pixel circuit. In the scan-line periods of each of the frame periods, the corresponding pixel circuit receives display data from a corresponding data line, and the sensing circuit does not sense the corresponding pixel circuit.
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: October 22, 2019
    Assignee: Novatek Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Shang-I Liu, Hua-Gang Chang
  • Publication number: 20190267340
    Abstract: A manufacturing process for a micro-device panel including the following steps is provided. A plurality of micro-device sets are formed on a transferring substrate, and each of the plurality of micro-device sets has at least one micro-device. A plurality of receiving blocks are provided. The plurality of micro-device sets are respectively transferred from the transferring substrate onto the plurality of receiving blocks to form a plurality of building blocks by a transfer head. The plurality of building blocks are placed on a receiving substrate. Finally, the adjacent building blocks on the receiving substrate are connected by a plurality of connecting devices to form the micro-device panel.
    Type: Application
    Filed: May 15, 2019
    Publication date: August 29, 2019
    Applicant: Novatek Microelectronics Corp.
    Inventors: Sheng-Tien Cho, Hua-Gang Chang
  • Patent number: 10388207
    Abstract: An external compensation method for devices in a panel which comprises a plurality of sub-pixels, includes programming a first device in a first sub-pixel among the plurality of sub-pixels via a first line and sensing the first device via a second line during a first period; and programming a second device in a second sub-pixel among the plurality of sub-pixels via the second line and sensing the second device via the first line or a third line during a second period.
    Type: Grant
    Filed: August 17, 2016
    Date of Patent: August 20, 2019
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Hua-Gang Chang, Shang-I Liu, Chun-Chieh Lin
  • Publication number: 20190156757
    Abstract: A driving apparatus for driving a display panel including a connection pad, a selecting circuit, a data driving circuit and a detection circuit is provided. The selecting circuit is electrically connected to a data line of the display panel through the connection pad. The data driving circuit outputs a data voltage to a pixel circuit of the display panel through the selecting circuit and the connection pad in a display stage. The detection circuit provides a detection signal to a light-emitting element of the pixel circuit through the selecting circuit and the connection pad in a detection stage, and detects a resultant signal with respect to an electric characteristic of the light-emitting element of the pixel circuit in the detection stage.
    Type: Application
    Filed: November 21, 2018
    Publication date: May 23, 2019
    Applicant: Novatek Microelectronics Corp.
    Inventors: Hua-Gang Chang, Shang-I Liu
  • Publication number: 20190139497
    Abstract: The invention provides a display panel driving circuit and a method for capturing error information thereof. The display panel driving circuit includes a driving circuit, a pixel circuit and a timing controller circuit. The method includes: obtaining LED error information indicating errors caused by an LED of the pixel circuit; driving the LED by the drive circuit to obtain LED and driving circuit error information; obtaining driving circuit error information according to the two error information. The timing controller circuit records the error information and compensates LED attenuation by using the error information.
    Type: Application
    Filed: September 4, 2018
    Publication date: May 9, 2019
    Applicant: Novatek Microelectronics Corp.
    Inventors: Hua-Gang Chang, Kuei-Chung Chang
  • Publication number: 20190139471
    Abstract: An apparatus and a method for sensing a display panel are provided. The apparatus includes a source driving circuit and a sensing circuit. The source driving circuit is coupled to data lines to drive the pixel circuits according to a display period comprising frame periods. The sensing circuit is coupled to a plurality of pixel circuits. The sensing circuit senses characteristics of the pixel circuits in the test data periods of the display period. The test data periods are periodically arranged in the display period. In each of the test data periods, a corresponding pixel circuit receives test data, and the sensing circuit senses the electrical characteristic of the corresponding pixel circuit. In the scan-line periods of each of the frame periods, the corresponding pixel circuit receives display data from a corresponding data line, and the sensing circuit does not sense the corresponding pixel circuit.
    Type: Application
    Filed: January 8, 2019
    Publication date: May 9, 2019
    Applicant: Novatek Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Shang-I Liu, Hua-Gang Chang
  • Patent number: 10210783
    Abstract: An apparatus and a method for sensing a display panel are provided. The apparatus includes a source driving circuit and a sensing circuit. The source driving circuit is coupled to data lines to drive the pixel circuits according to a scan-line period for scanning one of the scan lines. The sensing circuit is coupled to a plurality of pixel circuits. The sensing circuit senses characteristics of the pixel circuits according to the scan-line period for scanning one of the scan lines, wherein the scan-line period comprises a display data period and a test data period. In the test data period, a corresponding pixel circuit receives test data, and the sensing circuit senses the electrical characteristic of the corresponding pixel circuit. In the display data period, the corresponding pixel circuit receives display data from a corresponding data line, and the sensing circuit does not sense the corresponding pixel circuit.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: February 19, 2019
    Assignee: Novatek Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Shang-I Liu, Hua-Gang Chang
  • Publication number: 20180366046
    Abstract: An apparatus and a method for sensing a display panel are provided. The apparatus includes a source driving circuit and a sensing circuit. The source driving circuit is coupled to data lines to drive the pixel circuits according to a scan-line period for scanning one of the scan lines. The sensing circuit is coupled to a plurality of pixel circuits. The sensing circuit senses characteristics of the pixel circuits according to the scan-line period for scanning one of the scan lines, wherein the scan-line period comprises a display data period and a test data period. In the test data period, a corresponding pixel circuit receives test data, and the sensing circuit senses the electrical characteristic of the corresponding pixel circuit. In the display data period, the corresponding pixel circuit receives display data from a corresponding data line, and the sensing circuit does not sense the corresponding pixel circuit.
    Type: Application
    Filed: August 27, 2018
    Publication date: December 20, 2018
    Applicant: Novatek Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Shang-I Liu, Hua-Gang Chang
  • Patent number: 10074341
    Abstract: An image processing method and a display device thereof are provided. The method is adapted to a display panel with a display area. The image processing method includes the following steps. Whether original images to be displayed on a plurality of sub-areas of the display area are still is analyzed and determined. When the original image in a current sub-area is still, a time length of the original image being still is recorded. The current sub-area is one of the sub-areas. Processing levels corresponding to a plurality of image processing schemes are determined based on the time length. Overall or partial luminance (luma) of the original image in the current sub-area is gradually reduced by the image processing schemes with the determined processing levels, and a corresponding luma-reduced image is displayed on the current sub-area.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: September 11, 2018
    Assignee: Novatek Microelectronics Corp.
    Inventors: Hsueh-Yen Yang, Hua-Gang Chang, Chun-Chieh Lin
  • Patent number: 10074298
    Abstract: An image processing method and a display device thereof are provided. The method is adapted to a display panel with a display area. The image processing method includes the following steps. Whether original images to be displayed on a plurality of sub-areas of the display area are still is analyzed and determined. When the original image in a current sub-area is still, a time length of the original image being still is recorded. The current sub-area is one of the sub-areas. Processing levels corresponding to a plurality of image processing schemes are determined based on the time length. Overall or partial luminance (luma) of the original image in the current sub-area is gradually reduced by the image processing schemes with the determined processing levels, and a corresponding luma-reduced image is displayed on the current sub-area.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: September 11, 2018
    Assignee: Novatek Microelectronics Corp.
    Inventors: Hsueh-Yen Yang, Hua-Gang Chang, Chun-Chieh Lin
  • Patent number: 10068528
    Abstract: An apparatus and a method for sensing a display panel are provided. The apparatus includes a gate driving circuit and a sensing circuit. The gate driving circuit may scan the scan-lines during a plurality of scan-line periods within a frame period. The sensing circuit is coupled to a plurality of pixel circuits. A corresponding scan-line period of the scan-line periods is divided into a test data period and a display data period. In the test data period, the sensing circuit controls a corresponding pixel circuit to receive the test data, and the sensing circuit senses the electrical characteristic of the corresponding pixel circuit. In the display data period, the sensing circuit controls the corresponding pixel circuit to receive the display data from a corresponding data line, and the sensing circuit does not sense the corresponding pixel circuit.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: September 4, 2018
    Assignee: Novatek Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Shang-I Liu, Hua-Gang Chang
  • Publication number: 20180240931
    Abstract: A manufacturing process for a micro-device panel including the following steps is provided. A plurality of micro-device sets are formed on a transferring substrate, and each of the plurality of micro-device sets has at least one micro-device. A plurality of receiving blocks are provided. The plurality of micro-device sets are respectively transferred from the transferring substrate onto the plurality of receiving blocks to form a plurality of building blocks by a transfer head. The plurality of building blocks are placed on a receiving substrate. Finally, the adjacent building blocks on the receiving substrate are connected by a plurality of connecting devices to form the micro-device panel.
    Type: Application
    Filed: February 23, 2017
    Publication date: August 23, 2018
    Applicant: Novatek Microelectronics Corp.
    Inventors: Sheng-Tien Cho, Hua-Gang Chang
  • Publication number: 20180204539
    Abstract: An image processing method and a display device thereof are provided. The method is adapted to a display panel with a display area. The image processing method includes the following steps. Whether original images to be displayed on a plurality of sub-areas of the display area are still is analyzed and determined. When the original image in a current sub-area is still, a time length of the original image being still is recorded. The current sub-area is one of the sub-areas. Processing levels corresponding to a plurality of image processing schemes are determined based on the time length. Overall or partial luminance (luma) of the original image in the current sub-area is gradually reduced by the image processing schemes with the determined processing levels, and a corresponding luma-reduced image is displayed on the current sub-area.
    Type: Application
    Filed: April 10, 2017
    Publication date: July 19, 2018
    Applicant: Novatek Microelectronics Corp.
    Inventors: Hsueh-Yen Yang, Hua-Gang Chang, Chun-Chieh Lin
  • Publication number: 20180204498
    Abstract: An image processing method and a display device thereof are provided. The method is adapted to a display panel with a display area. The image processing method includes the following steps. Whether original images to be displayed on a plurality of sub-areas of the display area are still is analyzed and determined. When the original image in a current sub-area is still, a time length of the original image being still is recorded. The current sub-area is one of the sub-areas. Processing levels corresponding to a plurality of image processing schemes are determined based on the time length. Overall or partial luminance (luma) of the original image in the current sub-area is gradually reduced by the image processing schemes with the determined processing levels, and a corresponding luma-reduced image is displayed on the current sub-area.
    Type: Application
    Filed: January 18, 2017
    Publication date: July 19, 2018
    Applicant: Novatek Microelectronics Corp.
    Inventors: Hsueh-Yen Yang, Hua-Gang Chang, Chun-Chieh Lin
  • Publication number: 20180068618
    Abstract: An apparatus and a method for sensing a display panel are provided. The apparatus includes a gate driving circuit and a sensing circuit. The gate driving circuit may scan the scan-lines during a plurality of scan-line periods within a frame period. The sensing circuit is coupled to a plurality of pixel circuits. A corresponding scan-line period of the scan-line periods is divided into a test data period and a display data period. In the test data period, the sensing circuit controls a corresponding pixel circuit to receive the test data, and the sensing circuit senses the electrical characteristic of the corresponding pixel circuit. In the display data period, the sensing circuit controls the corresponding pixel circuit to receive the display data from a corresponding data line, and the sensing circuit does not sense the corresponding pixel circuit.
    Type: Application
    Filed: September 8, 2016
    Publication date: March 8, 2018
    Applicant: Novatek Microelectronics Corp.
    Inventors: Chun-Chieh Lin, Shang-I Liu, Hua-Gang Chang
  • Publication number: 20170365202
    Abstract: A method of compensating luminance of an organic light-emitting diode (OLED) operated with a transistor in a pixel cell of a display panel includes measuring a first parameter of the transistor and a parameter of the OLED, and generating a lookup table accordingly; converting original display data to target display data according to the lookup table; outputting the target display data to the pixel cell; and compensating a second parameter of the transistor when the target display data is received by the pixel cell.
    Type: Application
    Filed: June 21, 2016
    Publication date: December 21, 2017
    Inventors: Chun-Chieh Lin, Hua-Gang Chang, Hsueh-Yen Yang, Shang-Yu Su, Feng-Ting Pai
  • Publication number: 20170352305
    Abstract: An external compensation method for devices in a panel which comprises a plurality of sub-pixels, includes programming a first device in a first sub-pixel among the plurality of sub-pixels via a first line and sensing the first device via a second line during a first period; and programming a second device in a second sub-pixel among the plurality of sub-pixels via the second line and sensing the second device via the first line or a third line during a second period.
    Type: Application
    Filed: August 17, 2016
    Publication date: December 7, 2017
    Inventors: Hua-Gang Chang, Shang-I Liu, Chun-Chieh Lin
  • Patent number: 9697909
    Abstract: A shift register comprises a first switch, a second switch, a third switch, and a fourth switch. The first switch selectively conducts a first clock signal to a first output terminal as a first output signal based on a voltage level over the control terminal. The second switch selectively forces a voltage level of the first output signal to be equal to a voltage level of a second clock signal based on both of the second clock signal and a third clock signal inverted to the second clock signal. The third switch selectively defines a voltage over the control terminal to be a first voltage based on a first input signal. The fourth switch selectively forces the voltage level over the control terminal to be equal to the voltage level of the second clock signal based on both of the second clock signal and the third clock signal.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: July 4, 2017
    Assignee: AU OPTRONICS CORP.
    Inventors: Ya-Ling Chen, Ching-Kai Lo, Chien-Chung Huang, Hua-Gang Chang
  • Patent number: D844844
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: April 2, 2019
    Assignee: Apollo Building Products, Inc.
    Inventors: Gang Chang, Joseph R. Soltesiz