Patents by Inventor Kin Pui Ho

Kin Pui Ho 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).

  • Methods and apparatuses for providing sensing signals for projected capacitive touch sensing using a differential current mode analog circuit
    Patent number: 9817509
    Abstract: An analog front-end circuit comprising: a first current mode differential charge amplifier for a first sensing line, comprising: a unity gain buffer with current replication circuit, wherein the first sensing line current being fed to the unity gain buffer with current replication circuit to generate a pull up and a pull down output currents; and a current mirroring and amplification circuit, wherein the pull up and pull down output currents being fed to the current mirroring and amplification circuit to generate a positively scaled and a negatively scaled output currents; a current combining circuit for combining the positively scaled output generated for the first sensing line and a negatively scaled output current generated for a second sensing line to generate a differential current; and a differential current-to-voltage converter for converting the differential current to an output voltage usable by touch controller application.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: November 14, 2017
    Assignee: SOLOMON SYSTECH LIMITED
    Inventors: Yin Li, Kin Pui Ho, Kut Hing Lam
  • DIFFERENTIAL CURRENT MODE ANALOG FRONT-END CIRCUIT FOR CAPACITIVE TOUCH SENSING IN TOUCHSCREEN PANELS
    Publication number: 20170123551
    Abstract: An analog front-end circuit comprising: a first current mode differential charge amplifier for a first sensing line, comprising: a unity gain buffer with current replication circuit, wherein the first sensing line current being fed to the unity gain buffer with current replication circuit to generate a pull up and a pull down output currents; and a current mirroring and amplification circuit, wherein the pull up and pull down output currents being fed to the current mirroring and amplification circuit to generate a positively scaled and a negatively scaled output currents; a current combining circuit for combining the positively scaled output generated for the first sensing line and a negatively scaled output current generated for a second sensing line to generate a differential current; and a differential current-to-voltage converter for converting the differential current to an output voltage usable by touch controller application.
    Type: Application
    Filed: October 30, 2015
    Publication date: May 4, 2017
    Inventors: Yin Li, Kin Pui Ho, Kut Hing Lam