Patents by Inventor Yaw-Guang Chang

Yaw-Guang 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).

  • TOUCH DRIVING APPARATUS, TOUCH DRIVING METHOD AND TOUCH DISPLAY SYSTEM
    Publication number: 20170060295
    Abstract: A touch driving apparatus, a touch driving method, and a touch display system are provided. The touch display system includes a touch display panel, a common voltage generator, and a touch driving apparatus. The touch driving apparatus includes a driving circuit, a capacitor, and a sensing circuit. An output terminal of the driving circuit is electrically connected to a driving electrode line of the touch display panel. During a touch driving period, the driving circuit outputs a driving signal to the driving electrode line. A first terminal of the capacitor is electrically connected to a common electrode line of pixels of the touch display panel. An input terminal of the sensing circuit is electrically connected to a second terminal of the capacitor. During a touch driving period, the sensing circuit senses the common electrode line through the capacitor to detect a touch event of the touch display panel.
    Type: Application
    Filed: September 1, 2015
    Publication date: March 2, 2017
    Inventors: Jia-Ming He, Yaw-Guang Chang
  • IN-CELL TOUCH SCREEN AND A METHOD OF DRIVING THE SAME
    Publication number: 20170024034
    Abstract: The present invention is directed to a method of driving an in-cell touch screen. Source lines underlying a current VCOM electrode are divided into n groups. A first voltage is applied at the current VCOM electrode in a conversion phase of each sensing period. A second voltage is applied at each group of the source lines underlying the current VCOM electrode in a manner such that no net charge being contributed to the VCOM electrode by the underlying source lines, thereby parasitic capacitors associated with the current VCOM electrode having no effect on touch sensing result.
    Type: Application
    Filed: July 21, 2015
    Publication date: January 26, 2017
    Inventors: Wei-Song Wang, Yaw-Guang Chang
  • Decimatorless continuous-time delta-sigma analog-to-digital receiver
    Patent number: 9543977
    Abstract: A decimatorless continuous-time delta-sigma analog-to-digital receiver includes a continuous-time delta-sigma modulator (CTDSM) that receives a receiving signal and is configured to encode analog signals into digital signals; and a demodulator that receives a digital output of the CTDSM and is configured to recover information content from the receiving signal.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: January 10, 2017
    Assignee: Himax Technologies Limited
    Inventors: Chang-Hui Lin, Yaw-Guang Chang, Guan-Ying Huang
  • IN-CELL TOUCH SCREEN AND A METHOD OF DRIVING THE SAME
    Publication number: 20160349919
    Abstract: The present invention is directed to a method of driving an in-cell touch screen. A common voltage (VCOM) layer of the in-cell touch screen is divided into transmit (TX) electrodes and receive (RX) electrodes, the TX electrodes forming TX electrode lines in a first direction and the RX electrodes forming RX electrode lines in a second direction. The TX electrode lines are arranged into a plurality of groups. The groups of TX electrode lines are concurrently scanned in touch sensing mode.
    Type: Application
    Filed: July 29, 2015
    Publication date: December 1, 2016
    Inventor: Yaw-Guang Chang
  • IN-CELL TOUCH SCREEN AND A METHOD OF DRIVING THE SAME
    Publication number: 20160334916
    Abstract: The present invention is directed to a method of driving an in-cell touch screen. In one embodiment, adjacent common voltage (VCOM) electrodes, a source line and/or a gate line is set high-impedance, such that an equivalent capacitor is not possessed by the current VCOM electrode. In another embodiment, a gate line is set high-impedance in the touch sensing mode. A voltage waveform of the current VCOM electrode is applied to adjacent VCOM electrodes abutting the current VCOM electrode and/or to a source line, such that an equivalent capacitor has no effect on the current VCOM electrode.
    Type: Application
    Filed: August 14, 2015
    Publication date: November 17, 2016
    Inventors: Guan-Ying Huang, Wei-Song Wang, Yaw-Guang Chang
  • Input system utilizing stylus pen which receives electrical signals via connection link
    Patent number: 9495036
    Abstract: An input system includes a touch panel, a control circuit, a stylus pen, and a connection link. The control circuit generates an electrical signal. The stylus pen is external to the control circuit. The connection link is coupled between the control circuit and the stylus pen, and transmits the electrical signal to the stylus pen, wherein the electrical signal is coupled to the touch panel via the stylus pen. The connection link may be a wired link or a wireless link.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: November 15, 2016
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventor: Yaw-Guang Chang
  • Electronic device with touch sensitive functionality
    Patent number: 9495049
    Abstract: The touch-sensitive apparatus includes a touch sensing area, an analog-to-digital converter and a mixer. The touch sensing area has sensing pixels for receiving a touching signal to generate inducted signals. The analog-to-digital converter converts the inducted signals into digital signals. The mixer includes an in-phase multiplier, a quadrature multiplier, an in-phase summer, a quadrature summer and a Pythagorean operator. The in-phase multiplier multiplies each digital signal with a first reference signal to generate in-phase modulated signals. The quadrature multiplier multiplies each digital signal with a second reference signal to generate quadrature modulated signals. The in-phase summer respectively sums up elements of each modulated signal to generate in-phase values. The quadrature summer respectively sums up elements of each quadrature modulated signal to generate quadrature values.
    Type: Grant
    Filed: May 18, 2014
    Date of Patent: November 15, 2016
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Guan-Ying Huang, Yaw-Guang Chang, Chang-Hui Lin
  • Touch screen, touch sensing device and a method of driving the same
    Patent number: 9471168
    Abstract: A touch sensing device includes a first conductive layer that acts as a common voltage layer in a display mode; and a second conductive layer electrically isolated from the first conductive layer, the second conductive layer having source lines that transfer data to be displayed in the display mode and act as transmitting (TX) electrode lines in a touch sensing mode. The first conductive layer includes RX electrode lines and blocks that are disposed among and separated by the RX electrode lines. The RX electrode lines and the blocks are electrically connected to a common voltage in the display mode.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: October 18, 2016
    Assignee: Himax Technologies Ltd.
    Inventors: Chia-Wei Hu, Yaw-Guang Chang, Shen-Feng Tai, Wai Pan Wu
  • LOW LOADING DRIVING METHOD, DRIVER INTEGRATED CIRCUIT APPLYING THE METHOD, AND TOUCH DISPLAY SYSTEM
    Publication number: 20160299620
    Abstract: A driver integrated circuit (IC) is arranged to selectively operate in a display mode and a touch-sensing mode when the driver IC is coupled to a touch display panel. When the driver IC operates in the display mode, the driver IC controls a plurality of common voltage lines of the touch display panel to have a common voltage. When the driver IC operates in the touch-sensing mode, the driver IC controls a first source line of the touch display panel which corresponds to a specific common voltage line, or controls a neighboring common voltage line of the specific common voltage line, to have a first signal pattern the same as the first signal pattern on the specific voltage line or to be floating, wherein the specific common voltage line is arranged to detect touch currently.
    Type: Application
    Filed: August 18, 2015
    Publication date: October 13, 2016
    Inventors: Guan-Ying Huang, Yaw-Guang Chang
  • DRIVER INTEGRATED CIRCUIT, DRIVING METHOD, AND TOUCH DISPLAY SYSTEM
    Publication number: 20160283018
    Abstract: A driver integrated circuit (IC), arranged to selectively operate in a display mode, a self-capacitor mode and a mutual-capacitor mode when the driver IC is coupled to a touch display panel, wherein when the driver IC operates in the display mode, the driver IC outputs display data to a plurality of source lines of the touch display panel; when the driver IC operates in the self-capacitor mode, the driver controls the source lines to have a predetermined voltage; and when the driver IC operates in the mutual-capacitor mode, the driver IC sequentially sends an impulse signal to the source lines.
    Type: Application
    Filed: June 26, 2015
    Publication date: September 29, 2016
    Inventors: Guan-Ying Huang, Yaw-Guang Chang
  • IN-CELL TOUCH SCREEN AND A CONCURRENT SENSING CIRCUIT
    Publication number: 20160246411
    Abstract: A concurrent sensing circuit adaptable to an in-cell touch screen, including a plurality of summing circuits, each of which has a plurality of input ends for receiving a plurality of sensing signals provided at associated sensing points of a display panel, the input ends of each summing circuit either adding the sensing signal or performing no operation, thereby generating a summing signal at an associated output end of the summing circuit; and a plurality of receiving circuits associatively coupled to receive output ends of the summing circuits, respectively, the receiving circuits processing summing signals, thereby generating summing values, respectively, according to which a touch position or positions are determined.
    Type: Application
    Filed: July 17, 2015
    Publication date: August 25, 2016
    Inventors: Wei-Song Wang, Yaw-Guang Chang
  • TOUCH SENSING DEVICE AND CONCURRENT SENSING CIRCUIT
    Publication number: 20160246406
    Abstract: A concurrent sensing circuit adaptable to a touch panel, including a plurality of summing circuits, each of which has input ends for receiving sensing signals provided at associated receiving ends of the touch panel, the input ends of each summing circuit adding or subtracting the sensing signals, thereby generating a summing signal at an associated output end of the summing circuit; and a plurality of receiving circuits associatively coupled to receive output ends of the summing circuits, respectively, the receiving circuits processing summing signals, thereby generating summing values, respectively, according to which a touch position or positions are determined.
    Type: Application
    Filed: February 19, 2015
    Publication date: August 25, 2016
    Inventors: Wei-Song Wang, Yaw-Guang Chang
  • Controlling method and touch panel using the same for reducing resolution requirement of analog-digital converter
    Patent number: 9411480
    Abstract: The touch panel includes a panel capacitor, a first circuit, a first capacitor, a second circuit and a controlling circuit. The first capacitor is coupled to the panel capacitor. The first circuit transmits a scan signal to the panel capacitor. The second circuit transmits an inverting signal to the first capacitor. The inverting signal is synchronized with the scan signal, a frequency of the inverting signal is identical to a frequency of the scan signal, and the inverting signal is phase-inverted from the scan signal. The controlling circuit outputs a touch signal in response to a voltage at a terminal of the panel capacitor, in which the touch signal is configured to estimate a capacitance of the panel capacitor.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: August 9, 2016
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Jia-Ming He, Yaw-Guang Chang
  • TOUCH SCREEN, TOUCH SENSING DEVICE AND A METHOD OF DRIVING THE SAME
    Publication number: 20160103535
    Abstract: A touch sensing device includes a first conductive layer that acts as a common voltage layer in a display mode; and a second conductive layer electrically isolated from the first conductive layer, the second conductive layer having source lines that transfer data to be displayed in the display mode and act as transmitting (TX) electrode lines in a touch sensing mode. The first conductive layer includes RX electrode lines and blocks that are disposed among and separated by the RX electrode lines. The RX electrode lines and the blocks are electrically connected to a common voltage in the display mode.
    Type: Application
    Filed: February 19, 2015
    Publication date: April 14, 2016
    Inventors: Chia-Wei Hu, Yaw-Guang Chang, Shen-Feng Tai, Wai Pan Wu
  • CONTROLLING METHOD AND TOUCH PANEL USING THE SAME
    Publication number: 20160103514
    Abstract: A controlling method and a touch panel are provided. The touch panel includes a panel capacitor, a first circuit, a first capacitor, a second circuit and a controlling circuit. The first capacitor is coupled to the panel capacitor. The first circuit transmits a scan signal to the panel capacitor. The second circuit transmits an inverting signal to the first capacitor. The inverting signal is synchronized with the scan signal, a frequency of the inverting signal is identical to a frequency of the scan signal, and the inverting signal is phase-inverted from the scan signal. The controlling circuit outputs a touch signal in response to a voltage at a terminal of the panel capacitor, in which the touch signal is configured to estimate a capacitance of the panel capacitor. Accordingly, a resolution requirement of the controlling circuit is reduced.
    Type: Application
    Filed: October 14, 2014
    Publication date: April 14, 2016
    Inventors: Jia-Ming HE, Yaw-Guang CHANG
  • DECIMATORLESS CONTINUOUS-TIME DELTA-SIGMA ANALOG-TO-DIGITAL RECEIVER
    Publication number: 20160080019
    Abstract: A decimatorless continuous-time delta-sigma analog-to-digital receiver includes a continuous-time delta-sigma modulator (CTDSM) that receives a receiving signal and is configured to encode analog signals into digital signals; and a demodulator that receives a digital output of the CTDSM and is configured to recover information content from the receiving signal.
    Type: Application
    Filed: November 6, 2014
    Publication date: March 17, 2016
    Inventors: Chang-Hui Lin, Yaw-Guang Chang, Guan-Ying Huang
  • TOUCH DISPLAY DEVICE with multiple alternating touch periods and display periods per frame
    Publication number: 20160034060
    Abstract: The touch display device includes a display panel and a panel driver. The display panel displays a video and to receive a touch operation. The panel driver includes a timing controller and a memory module. The timing controller generates a clock signal, each cycle of the clock signal including N display periods and N touch periods, the total time of the N display periods corresponding to a frame of a video signal, and the total time of the N display periods and the N touch periods corresponding to one cycle of the video signal, in which N is a positive integer. The panel driver alternately drives the panel to display the video during each of the N display periods and to detect the touch operation during each of the N touch periods. The memory module sequentially stores the image data of the video signal according to the clock signal.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 4, 2016
    Inventors: Yu-Feng LIN, Yaw-Guang CHANG
  • ELECTRONIC DEVICE WITH TOUCH SENSITIVE FUNCTIONALITY
    Publication number: 20150331509
    Abstract: The touch-sensitive apparatus includes a touch sensing area, an analog-to-digital converter and a mixer. The touch sensing area has sensing pixels for receiving a touching signal to generate inducted signals. The analog-to-digital converter converts the inducted signals into digital signals. The mixer includes an in-phase multiplier, a quadrature multiplier, an in-phase summer, a quadrature summer and a Pythagorean operator. The in-phase multiplier multiplies each digital signal with a first reference signal to generate in-phase modulated signals. The quadrature multiplier multiplies each digital signal with a second reference signal to generate quadrature modulated signals. The in-phase summer respectively sums up elements of each modulated signal to generate in-phase values. The quadrature summer respectively sums up elements of each quadrature modulated signal to generate quadrature values.
    Type: Application
    Filed: May 18, 2014
    Publication date: November 19, 2015
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: Guan-Ying HUANG, Yaw-Guang CHANG, Chang-Hui LIN
  • SHIFT REGISTER ADAPTABLE TO A GATE DRIVER
    Publication number: 20150317018
    Abstract: A shift register adaptable to a gate driver includes a plurality of active latches and inactive latches, which are connected in cascade. At least one inactive latch is disposed between two adjacent active latches, and each said active latch has its output signal configured as a gate control signal to control a display panel, while an output signal of each said inactive latch is not coupled to the display panel.
    Type: Application
    Filed: April 30, 2014
    Publication date: November 5, 2015
    Applicant: HIMAX TECHNOLOGIES LIMITED
    Inventors: TZU-TSAI LIN, YAW-GUANG CHANG
  • Touch display device and method
    Patent number: 9158404
    Abstract: A touch display device including an active matrix, a driving module, a sensing module and a control unit is provided. The active matrix includes a plurality of common electrodes, scan lines, and data lines. At least parts of the common electrodes form a first touch electrode set and at least parts of the data lines form a second touch electrode set. The control unit is configured to cause the driving module to drive the scan lines, the data lines, and the common electrodes in at least one display driving period to perform a displaying function, and to cause the driving module to drive one of the first touch electrode set and the second touch electrode set and cause the sensing module to receive signals from the other in at least one touch sensing period so as to perform a touch sensing function. A touch display method is also provided.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: October 13, 2015
    Assignee: HIMAX TECHNOLOGIES LIMITED
    Inventors: Yaw-Guang Chang, Wei-Song Wang