Patents by Inventor JIANCONG RUAN

JIANCONG RUAN 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: 9818338
    Abstract: An LED driver includes a current driver receiving a reference voltage providing a charging current for driving channel output(s) of an LED panel. A pre-charge circuit includes a voltage selector having a first and second select input, a control input receiving a pre-charge voltage select signal based on a next ON/OFF state that is after a current sub-period, and a voltage selector output for switchably outputting a higher voltage level (V_H) when the next state is OFF and a lower level (V_L) when the next state ON. An enable circuit has an enable input receiving an enable signal active during a break time of the current sub-period for driving the channel output when enabled with a pre-charge current to V_H or a relatively higher voltage level when the next state is OFF, and to V_L or a relatively lower voltage level when the next state is ON.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: November 14, 2017
    Assignee: Texas Instruments Incorporated
    Inventors: Jiancong Ruan, Minyi Xie, Runqin Tan
  • Publication number: 20160260375
    Abstract: An LED driver includes a current driver receiving a reference voltage providing a charging current for driving channel output(s) of an LED panel. A pre-charge circuit includes a voltage selector having a first and second select input, a control input receiving a pre-charge voltage select signal based on a next ON/OFF state that is after a current sub-period, and a voltage selector output for switchably outputting a higher voltage level (V_H) when the next state is OFF and a lower level (V_L) when the next state ON. An enable circuit has an enable input receiving an enable signal active during a break time of the current sub-period for driving the channel output when enabled with a pre-charge current to V_H or a relatively higher voltage level when the next state is OFF, and to V_L or a relatively lower voltage level when the next state is ON.
    Type: Application
    Filed: March 4, 2015
    Publication date: September 8, 2016
    Inventors: JIANCONG RUAN, MINYI XIE, RUNQIN TAN