Patents by Inventor Chin-Fu Chang

Chin-Fu 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).

  • Publication number: 20200019257
    Abstract: A stylus includes a pen body, an internal circuit, at least one modular function device, and a pen head disposed at a lower part of the pen body and including a first conductive part. The modular function device includes a circuit module disposed inside a main body thereof and electrically connected to connection interfaces disposed on upper and lower sides of the main body, respectively. The connection interface of the modular function device can be mounted on the adapted connection interface of the pen body, and two adjacent modular function devices can be concatenated with each other through the adapted connection interfaces thereof. As a result, according to the user's requirement, the stylus can be extended with various modular function devices, and the modular function device mounted on the stylus can also be replaced.
    Type: Application
    Filed: October 15, 2018
    Publication date: January 16, 2020
    Inventors: Chin-Fu CHANG, Shang-Tai YEH
  • Publication number: 20190391700
    Abstract: The present application provides a method for determining whether a line piece is corresponding to a stylus tip. The method comprises: gathering multiple touch sensitive signal values corresponding to the line piece; calculating a first slope at edge of the line piece; determining whether the first slope is larger than a slope threshold; and determining that the line piece is corresponding to the stylus tip if the first slope is larger than the slope threshold.
    Type: Application
    Filed: September 9, 2019
    Publication date: December 26, 2019
    Inventors: CHIN-FU CHANG, CHI-HAO TANG, JEN-YI SUN
  • Patent number: 10503288
    Abstract: The present invention provides a stylus for providing a tilt angle, comprising: a first electrode at a tip of the stylus; a second electrode surrounding the first electrode; a third electrode surrounding the second electrode, wherein the first electrode and the third electrode are not electrically coupled, the second electrode and the third electrode are not electrically coupled; and a control module connecting the first electrode, the second electrode and the third electrode, wherein the control module instructs the first electrode and the second electrode to emit a first-time-period electrical signal during a first time period, and instructs the first electrode and the second electrode to emit a second-time-period electrical signal and the third electrode to float during a second time period.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: December 10, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh
  • Patent number: 10503318
    Abstract: A despreading method is applicable to a touch sensitive screen including multiple first electrodes being parallel to a first axis and multiple second electrodes being parallel to a second axis. The despreading method includes the following steps: coupling at least two of the second electrodes as a synchronization channel; despreading a first preamble code of a first signal frame of received signal from the synchronization channel to retrieve a first synchronization information according to a first pseudo noise code; and decoding a first data code behind the first preamble code of received signal from at least one of the first electrodes in accordance with the first synchronization information and the first pseudo noise code.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: December 10, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh, Guang-Huei Lin
  • Publication number: 20190361568
    Abstract: A touch sensitive processing apparatus is provided for detecting whether a touch panel is mostly covered by a conductive liquid or object. The apparatus includes a driving circuit for providing a driving signal to one of multiple parallel electrodes of the touch panel; a sensing circuit for sensing multiple values by the electrodes with respect to the driving signal; and a processor. The processor is configured for commanding the driving circuit to provide the driving signal and receiving the multiple sensing values from the sensing circuit; and determining that the touch panel is mostly covered by a conductive liquid or object according to the sensing values.
    Type: Application
    Filed: August 8, 2019
    Publication date: November 28, 2019
    Inventor: CHIN-FU CHANG
  • Patent number: 10481707
    Abstract: The present application provides a touch sensitive information transmission method, comprising: transmitting sensing information of at least line piece of a first electrode, and detecting sensing information of a second electrode.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: November 19, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventor: Chin-Fu Chang
  • Patent number: 10452216
    Abstract: The present invention provides a touch processing device which is configured to connect to a touch sensitive panel having a plurality of sensing points. The touch processing device comprises a transmitter detecting module and an information transmitting module. The transmitter detecting module is configured to detect a transmitter transmitting an electrical signal only when approaching or touching the touch sensitive panel and to generate at least a two-dimensional sensing information. The at least one two-dimensional sensing information is sensing information corresponding to the plurality of sensing points with respect to at least one frequency. The information transmitting module is configured to transmit the at least one two-dimensional sensing information.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: October 22, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shun-Lung Ho
  • Patent number: 10444867
    Abstract: The present invention provides a transmitter which is configured to transmit an electrical signal to a touch sensitive device according to a transmitter status. After analyzing the electrical signal, the touch sensitive device is able to find out the transmitter status and a relative position of the transmitter with respect to the touch sensitive device. The electrical signal is mixed from a plurality of signals having different frequencies.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: October 15, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventor: Chin-Fu Chang
  • Publication number: 20190302909
    Abstract: The present invention provides a circuit system for saving power, including: a battery for supplying power; a boost converter circuit, coupled to the battery, for increasing voltage of direct current outputted from the battery; a switch circuit including a first end and a second end, the first end coupled to the boost converter circuit; a load circuit, coupled to the second end; a capacitor, coupled to the second end, for storing and discharging electric power for solely supplying the load circuit; and a control circuit, coupled to the boost converter circuit and the switch circuit, for implementing the following steps: if the voltage of the second end is less than a first voltage, enabling the boost converter circuit and having the switch circuit connect the first and the second ends; and if the voltage of the second end is larger than a second voltage, disabling the boost converter circuit and having the switch circuit disconnect the first and the second ends, wherein the second voltage is larger than the f
    Type: Application
    Filed: March 29, 2019
    Publication date: October 3, 2019
    Inventor: CHIN-FU CHANG
  • Patent number: 10429991
    Abstract: The present application provides a method for determining mistaken approaching/touching event, comprising: gathering one or more touch sensitive signal value corresponding to a line piece; calculating a sum of differences of each signal value and a baseline value; and if the sum is less than or equals to zero, determining the line piece is corresponding to a mistaken approaching/touching event.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: October 1, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh, Jen-Yi Sun
  • Patent number: 10423279
    Abstract: A touch sensitive processing apparatus is provided for detecting whether a touch panel is mostly covered by a conductive liquid or object. The apparatus includes a driving circuit for providing a driving signal to one of multiple parallel electrodes of the touch panel; a sensing circuit for sensing multiple values by the electrodes with respect to the driving signal; and a processor. The processor is configured for commanding the driving circuit to provide the driving signal and receiving the multiple sensing values from the sensing circuit; calculating a maximum difference between the largest and the smallest values of the sensing values; and if the maximum difference is less than a threshold, then determining that the touch panel is mostly covered by a conductive liquid or object.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: September 24, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventor: Chin-Fu Chang
  • Patent number: 10416791
    Abstract: A circuit switch comprises a first circuit board, a second circuit board and a third circuit board which are intact and sequentially parallel to each other; and a dual ramp means, wherein a first end of the first circuit board and a first end of the third circuit board contacts with the two ramps of the dual ramp means, respectively, a first end of the second circuit board does not contact with the dual ramp means, the first end of the second circuit board comprises a circuit, a second point and a third point of the circuit contacts with and electrically couples to a first point of the first circuit board and a fourth point of the third circuit board, respectively.
    Type: Grant
    Filed: October 19, 2017
    Date of Patent: September 17, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Po-Chuan Lin
  • Patent number: 10416829
    Abstract: The present invention provides a touch sensitive processing apparatus for controlling a pressure and touch sensitive panel which comprises: at least one elastic and dielectric element; and an enclosed force sensitive electrode located by one side of the elastic and dielectric element. The enclosed force sensitive electrode comprises multiple electrical wiring points for connecting to the touch sensitive processing apparatus.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: September 17, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh, Shun-Lung Ho
  • Patent number: 10402015
    Abstract: The present application provides a touch sensitive processing method for configuring interconnection parameters between a touch panel and a touch sensitive processing apparatus in an electronic system. The method comprises: connecting, by an interconnection network of the touch sensitive processing apparatus, P first circuits of a first apparatus connector with a drive circuit of the apparatus, connecting, by the interconnection network, Q second circuits of a second apparatus interface with a detecting circuit of the apparatus, respectively; having the drive circuit emit a drive signal from at least one of first touch sensitive electrodes via the interconnection network; and detecting, via the interconnection network by the detecting circuit, that there are N consecutive second touch sensitive electrodes connected to the N consecutive second circuits among the Q second circuits.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: September 3, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh
  • Patent number: 10381163
    Abstract: A method for assembling a force sensitive capacitor is provided. The method comprises: assembling an insulating member to a rear end of a rear-end moving part; inserting a front-end moving part and the rear-end moving part into a case from a front end and a rear end of the case, respectively, and assembling connecting portions of the front-end moving part and the rear-end moving part; assembling a compressible conductor to a front end of a conductor base; and inserting the conductor base into the case from the rear end of the case and assembling the conductor base to the case.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: August 13, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh, Ping Siauw, Yu-Hao Chang
  • Patent number: 10379683
    Abstract: The present invention provides a pressure and touch sensitive panel, comprising: at least one elastic and dielectric element; and an enclosed force sensitive electrode located by one side of the elastic and dielectric element. The enclosed force sensitive electrode comprises multiple electrical wiring points for connecting to a touch sensitive processing apparatus for the pressure and touch sensitive panel.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: August 13, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh, Shun-Lung Ho
  • Publication number: 20190235647
    Abstract: The present application provides a touch control apparatus for detecting a tilt angle of a stylus emitting electrical signals. A processing module of the touch control apparatus is configured for instructing a signal strength detecting circuit to calculate magnitudes of signal strengths of electrical signals in two time periods to determine a modulation sequence. The modulation sequence includes a plurality of modulations, in each of the time periods one type of the plurality of modulations is used. And the processing module is further configured for determining the tilt angle of the stylus based on the electrical signals of the two time periods.
    Type: Application
    Filed: April 12, 2019
    Publication date: August 1, 2019
    Inventors: CHIN-FU CHANG, SHANG-TAI YEH
  • Patent number: 10353521
    Abstract: The present invention provides a mutual-capacitance touch screen comprising multiple parallel first electrodes and multiple parallel second electrodes coupled to a touch sensitive processing apparatus; and a covering layer for covering the first and the second electrodes, wherein a thickness of the covering layer and a third distance between one of the first electrodes and an adjacent second electrode form a third ratio range.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: July 16, 2019
    Assignee: EGALAX_EMPIA TECHNOLOGY INC.
    Inventors: Chin-Fu Chang, Shang-Tai Yeh
  • Publication number: 20190187818
    Abstract: The present invention provides a stylus for providing a tilt angle, comprising: a first electrode at a tip of the stylus; a second electrode surrounding the first electrode; a third electrode surrounding the second electrode, wherein the first electrode and the third electrode are not electrically coupled, the second electrode and the third electrode are not electrically coupled; and a control module connecting the first electrode, the second electrode and the third electrode, wherein the control module instructs the first electrode and the second electrode to emit a first-time-period electrical signal during a first time period, and instructs the first electrode and the second electrode to emit a second-time-period electrical signal and the third electrode to float during a second time period.
    Type: Application
    Filed: February 22, 2019
    Publication date: June 20, 2019
    Inventors: CHIN-FU CHANG, SHANG-TAI YEH
  • Publication number: 20190179486
    Abstract: A touch sensitive processing apparatus is provided for detecting whether a touch panel is mostly covered by a conductive liquid or object. The apparatus includes a driving circuit for providing a driving signal to one of multiple parallel electrodes of the touch panel; a sensing circuit for sensing multiple values by the electrodes with respect to the driving signal; and a processor. The processor is configured for commanding the driving circuit to provide the driving signal and receiving the multiple sensing values from the sensing circuit; calculating a maximum difference between the largest and the smallest values of the sensing values; and if the maximum difference is less than a threshold, then determining that the touch panel is mostly covered by a conductive liquid or object.
    Type: Application
    Filed: February 13, 2019
    Publication date: June 13, 2019
    Inventor: CHIN-FU CHANG