Patents by Inventor Chung-Wen Chang

Chung-Wen 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: 11955469
    Abstract: A micro LED display panel includes a blue LED layer, a green LED layer, and a red LED layer. The blue LED layer, the green LED layer, and the red LED layer are in a stacked formation. The blue, the green, and the red LED layers each include a plurality of micro LEDs spaced apart from each other. The composition of the layers is such that light emitted from all but the bottom layer is able to pass through transparent material in other layers before exiting the panel and being viewed.
    Type: Grant
    Filed: June 17, 2021
    Date of Patent: April 9, 2024
    Assignee: HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: Wei-Chih Chang, Chung-Wen Lai
  • Patent number: 11494038
    Abstract: A touch panel includes a cover lens located at top of the touch panel, plural touch sensor units, and plural sensing channels. The touch sensor units are disposed below the cover lens and arranged in rows and columns. The touch sensor units are disposed on the sensing channels. Each of touch sensor units acquires a sensing magnitude for identifying a position of the cover lens that touched by the stylus according to signals outputted by the sensing channels. The sensing magnitude of one of the touch sensor units is composed of the signals of the adjacent sensing channels located within a vertical projection of the one of the touch sensor units.
    Type: Grant
    Filed: September 20, 2020
    Date of Patent: November 8, 2022
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Yaw-Guang Chang, Hui-Min Wang, Cheng-Hung Tsai, Chung-Wen Chang
  • Patent number: 11467690
    Abstract: A touch-and-display device operated with an active stylus is provided. A touch position is detected in a touch detection period. An uplink signal is transmitted and a downlink signal is detected in a stylus detection period. When the downlink signal is detected, it is determined if a distance between a stylus position and the touch position is less than or equal to a first predetermined distance. A stylus mode is not entered if the determination result is affirmative.
    Type: Grant
    Filed: September 29, 2021
    Date of Patent: October 11, 2022
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Chung-Wen Chang, Fong Wei Yang, Ming-Kai Cheng, Wen-Sen Su, Shen-Feng Tai
  • Patent number: 11353988
    Abstract: A touch display apparatus is disclosed, which includes a touch display panel and a driving circuit. The touch display panel is configured for display and touch sensing, which includes plural touch sensing pads arranged in touch sensing groups. The driving circuit is coupled to the touch display panel, and is configured to drive the touch display panel to perform display with respect to common voltage signal at a display stage of a frame period and to drive the touch display panel to perform touch sensing by applying a touch detection signal to all of the touch sensing pads simultaneously at a touch sensing stage of the frame period.
    Type: Grant
    Filed: February 19, 2021
    Date of Patent: June 7, 2022
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Chin-Yuan Chiang, Ho-Chia Hung, Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai
  • Patent number: 11282475
    Abstract: An electronic device control method applied to an electronic device can operate in a display mode and a touch sensing mode. The method comprises: (a) controlling the electronic device to have a first mode switch frequency; and (b) controlling the electronic device to have a second mode switch frequency different from the first mode switch frequency. The first mode switch frequency and the second mode switch frequency are frequencies for switching between the display mode and the touch sensing mode.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: March 22, 2022
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Chih-Ming Wu, Yaw-Guang Chang, Chin-Jung Chen, Yu-Feng Lin, Chung-Wen Chang
  • Publication number: 20210240288
    Abstract: A touch panel includes a cover lens located at top of the touch panel, plural touch sensor units, and plural sensing channels. The touch sensor units are disposed below the cover lens and arranged in rows and columns. The touch sensor units are disposed on the sensing channels. Each of touch sensor units acquires a sensing magnitude for identifying a position of the cover lens that touched by the stylus according to signals outputted by the sensing channels. The sensing magnitude of one of the touch sensor units is composed of the signals of the adjacent sensing channels located within a vertical projection of the one of the touch sensor units.
    Type: Application
    Filed: September 20, 2020
    Publication date: August 5, 2021
    Inventors: Yaw-Guang CHANG, Hui-Min WANG, Cheng-Hung TSAI, Chung-Wen CHANG
  • Publication number: 20210027740
    Abstract: An electronic device control method applied to an electronic device can operate in a display mode and a touch sensing mode. The method comprises: (a) controlling the electronic device to have a first mode switch frequency; and (b) controlling the electronic device to have a second mode switch frequency different from the first mode switch frequency. The first mode switch frequency and the second mode switch frequency are frequencies for switching between the display mode and the touch sensing mode.
    Type: Application
    Filed: July 23, 2019
    Publication date: January 28, 2021
    Inventors: Chih-Ming Wu, Yaw-Guang Chang, Chin-Jung Chen, Yu-Feng Lin, Chung-Wen Chang
  • Patent number: 10558306
    Abstract: A water mode detection method includes: operating a normal touch detection operation on each of a plurality of touch detection unit groups during each of a plurality of normal scan periods to obtain a first detection result; operating a dummy touch detection operation on a first touch detection group of the touch detection unit groups to obtain a second detection result during a dummy scan period, and setting a common voltage of a second touch detection group of a plurality of non-scanned touch detection unit groups to a reference ground during the dummy touch detection operation; and generating a water mode detection result according to the first detection result and the second detection result.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: February 11, 2020
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Fong-Wei Yang, Chun-Kai Chuang, Chih-Chen Tsai, Chung-Wen Chang
  • Publication number: 20180356931
    Abstract: A water mode detection method includes: operating a normal touch detection operation on each of a plurality of touch detection unit groups during each of a plurality of normal scan periods to obtain a first detection result; operating a dummy touch detection operation on a first touch detection group of the touch detection unit groups to obtain a second detection result during a dummy scan period, and setting a common voltage of a second touch detection group of a plurality of non-scanned touch detection unit groups to a reference ground during the dummy touch detection operation; and generating a water mode detection result according to the first detection result and the second detection result.
    Type: Application
    Filed: June 12, 2017
    Publication date: December 13, 2018
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Fong-Wei Yang, Chun-Kai Chuang, Chih-Chen Tsai, Chung-Wen Chang
  • Patent number: 9582109
    Abstract: A method for detecting noise of a touch panel and performing signal control is provided, where the method may determine how many cycles of frame data are influenced by noise, may determine whether the frame data is influenced by noise by determining whether a number of cycles influenced by noise is greater than a first threshold value or not, and may determine whether a number of continuous frame data determined to be influenced by noise is greater than a second threshold value to generate a determination result. Finally, the method may determine whether to adjust a frequency of the transmitting signals according to the determination result.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: February 28, 2017
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai, Jui-Min Liu
  • Patent number: 9310945
    Abstract: A touch-sensing display device comprises a plurality of row electrodes and column electrodes, a capacitance detector, detecting first capacitance-variation values of the row electrodes and second capacitance-variation values of the column electrodes, and detecting third capacitance-variation values of each intersection of the row electrodes and the column electrodes. The processor counts the first number of the first and second capacitance-variation values, exceeding a first threshold, counts the second number of the first and second capacitance-variation values up to a maximum capacitor-variation value, and counts the third number of the third capacitance values, exceeding a second threshold. The processor makes the touch-sensing display device enter a bending mode when the first and second numbers are over a first predetermined number and a second predetermined number respectively, and the third number is below the first number.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: April 12, 2016
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Jui-Ming Liu, Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai
  • Patent number: 9262009
    Abstract: A touch device and method for detecting a touch point thereof are provided. The method includes: detecting a plurality of first touch values, second touch values and third touch values corresponding to a plurality of touch regions of a touch panel, respectively, during a first frame period, a second frame period and a third frame period; performing a value obtaining operation to output a median of the first touch value, the second touch value and the third touch value to which each of the touch regions correspond; and determining a real touch point according a touch threshold and the first touch values, the second touch values and the third touch values outputted by the value obtaining operation.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: February 16, 2016
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Jui-Ming Liu, Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai
  • Patent number: 9244579
    Abstract: A touch display apparatus and a touch mode switching method thereof are provided. A touch mode of a touch panel is switched according to a touch track and a touch area of an input tool.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: January 26, 2016
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Li-Lin Liu, Shen-Feng Tai, Chung-Wen Chang, Jui-Min Liu
  • Patent number: 9104265
    Abstract: A touch device and an operating method thereof are provided. The operating method includes the following steps. A plurality of data baseline values of the touch panel is calibrated and set during an initialization of a touch panel. A plurality of touch data is obtained after scanning the touch panel. A plurality of touch values corresponding to the touch panel is calculated according to the data baseline values and the touch data. A touch point is detected according to the touch values. When the touch data is complied with a re-calibration requirement, the data baseline values are re-calibrated and reset.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: August 11, 2015
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Jui-Ming Liu, Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai
  • Publication number: 20150169102
    Abstract: A touch display apparatus and a touch mode switching method thereof are provided. A touch mode of a touch panel is switched according to a touch track and a touch area of an input tool.
    Type: Application
    Filed: December 18, 2013
    Publication date: June 18, 2015
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Li-Lin Liu, Shen-Feng Tai, Chung-Wen Chang, Jui-Min Liu
  • Publication number: 20150103031
    Abstract: A touch-sensing display device comprises a plurality of row electrodes and column electrodes, a capacitance detector, detecting first capacitance-variation values of the row electrodes and second capacitance-variation values of the column electrodes, and detecting third capacitance-variation values of each intersection of the row electrodes and the column electrodes. The processor counts the first number of the first and second capacitance-variation values, exceeding a first threshold, counts the second number of the first and second capacitance-variation values up to a maximum capacitor-variation value, and counts the third number of the third capacitance values, exceeding a second threshold. The processor makes the touch-sensing display device enter a bending mode when the first and second numbers are over a first predetermined number and a second predetermined number respectively, and the third number is below the first number.
    Type: Application
    Filed: October 15, 2013
    Publication date: April 16, 2015
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Jui-Ming Liu, Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai
  • Publication number: 20150091814
    Abstract: A method for detecting noise of a touch panel and performing signal control is provided, where the method may determine how many cycles of frame data are influenced by noise, may determine whether the frame data is influenced by noise by determining whether a number of cycles influenced by noise is greater than a first threshold value or not, and may determine whether a number of continuous frame data determined to be influenced by noise is greater than a second threshold value to generate a determination result. Finally, the method may determine whether to adjust a frequency of the transmitting signals according to the determination result.
    Type: Application
    Filed: September 30, 2013
    Publication date: April 2, 2015
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai, Jui-Min Liu
  • Patent number: 8988378
    Abstract: A touch device and a driving method thereof are provided. A scanning line driving frequency of the touch device is switched according to a plurality of preset driving frequency setting data groups, so as to prevent misjudgment of a touched position caused by electromagnetic noise.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: March 24, 2015
    Assignee: Himax Technologies Limited
    Inventors: Jui-Ming Liu, Li-Lin Liu, Chung-Wen Chang, Shen-Feng Tai
  • Publication number: 20150062058
    Abstract: A touch panel capable of detecting a stylus is disclosed. At least one self scan cycle and at least one mutual scan cycle are performed in each scan frame, and touch identification of the stylus is affirmed when both touch identifications via the self scan cycle and the mutual scan cycle are detected.
    Type: Application
    Filed: September 3, 2013
    Publication date: March 5, 2015
    Applicant: Himax Technologies Limited
    Inventors: Chung-Wen Chang, Shen-Feng Tai, Jui-Min Liu, Chun-Kai Chuang
  • Publication number: 20150042596
    Abstract: A touch panel capable of performing proximity function is disclosed. A voltage is applied to column electrode or row electrode during a self scan cycle, and a capacitive object close to a surface of the touch panel is measured on the same column electrode or row electrode. A voltage is applied to one axis during a mutual scan cycle, and a capacitive object close to the surface of the touch panel is measured on the other axis.
    Type: Application
    Filed: August 8, 2013
    Publication date: February 12, 2015
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Chung-Wen Chang, Shen-Feng Tai, Jui-Min Liu, Li-Lin Liu