Patents by Inventor Jang Su Kim

Jang Su Kim 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: 12232230
    Abstract: The present embodiment relates to a technology for facilitating an increase of the number of LEDs to be driven by communication of a clock signal between chips forming a daisy chain when driving LEDs. The communication of a clock signal as well as data between chips allows improve the synchronization between the clock signal and data.
    Type: Grant
    Filed: October 26, 2022
    Date of Patent: February 18, 2025
    Assignee: LX Semicon Co., Ltd.
    Inventors: Sang Suk Kim, Jang Su Kim, Ji Hwan Kim, Kyeong Rok Lee, Jong Min Lee
  • Patent number: 12223884
    Abstract: An LED driving circuit adjusts a PWM driving frequency in light emitting diode driving, and changes a PWM frequency of an LED driving circuit in response to a frequency of a PWM clock signal delivered externally or internally.
    Type: Grant
    Filed: March 31, 2023
    Date of Patent: February 11, 2025
    Assignee: LX SEMICON CO., LTD.
    Inventors: Sang Suk Kim, Jang Su Kim, Ji Hwan Kim, Jong Min Lee, Kyeong Rok Lee
  • Patent number: 12213219
    Abstract: The present disclosure relates to an LED driving circuit for controlling the voltage of an LED backlight system, and to a technology for controlling the driving voltage of an LED string formed at one end of the LED string through a digital counter by monitoring the output voltage of the LED string.
    Type: Grant
    Filed: March 31, 2023
    Date of Patent: January 28, 2025
    Assignee: LX SEMICON CO., LTD.
    Inventors: Sang Suk Kim, Jang Su Kim, Ji Hwan Kim, Kyeong Rok Lee, Jong Min Lee
  • Patent number: 12075534
    Abstract: A hybrid dimming control device, which prevents image quality degradation during local dimming of a backlight unit, includes an analysis circuit configured to determine a type of dimming data for controlling the local dimming of a light source included in a backlight unit by analyzing the dimming data, a pulse width modulation (PWM) dimming control circuit configured to control the local dimming of the light source by a PWM method when the type of the dimming data is a first type, and an active dimming control circuit configured to convert some bits of the dimming data into an analog signal and control the local dimming of the light source using the analog signal when the type of the dimming data is a second type.
    Type: Grant
    Filed: December 16, 2022
    Date of Patent: August 27, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Yun Sung Wang, Sang Suk Kim, Jang Su Kim
  • Patent number: 12062324
    Abstract: A current mirror circuit includes a first transistor configured to be supplied with a data current from a data driving circuit; a second transistor configured to drive a light emitting diode by mirroring the data current transferred to the first transistor; and a voltage compensation circuit disposed between one terminal of the first transistor and one terminal of the second transistor and configured to compensate for a difference between voltages of the one terminals of the first transistor and the second transistor.
    Type: Grant
    Filed: October 5, 2022
    Date of Patent: August 13, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Ji Hwan Kim, Sang Suk Kim, Jang Su Kim
  • Publication number: 20240260153
    Abstract: The light-emitting driving device can include a driving current generation circuit, a sensing circuit, a PWM signal generation circuit, and a controller. The driving current generation circuit can be connected to a channel terminal of a light-emitting string including a plurality of semiconductor light-emitting elements to generate a driving current supplied to the channel terminal. The sensing circuit is connected to the channel terminal to sense a voltage of the channel terminal. The PWM signal generation circuit can generate a PWM signal that controls the supply of driving current. The controller is connected to the sensing circuit to control at least one or more of the intensity of the driving current and the duty ratio of the PWM signal based on the sensed voltage of the channel terminal.
    Type: Application
    Filed: January 31, 2024
    Publication date: August 1, 2024
    Applicant: LX SEMICON CO., LTD.
    Inventors: Sang Suk KIM, Jang Su KIM, Ji Hwan KIM, Jin Ho CHOI
  • Patent number: 12051382
    Abstract: A system for controlling backlight unit capable of reducing a time difference between an image displayed on a display panel and local dimming of the backlight unit, includes a plurality of dimming control devices configured to receive an input data packet including dimming data, and control local dimming of a light source, which is included in a region assigned in advance in a backlight unit, using the dimming data, a plurality of gate lines configured to electrically connect a predetermined number of dimming control devices and configured to be sequentially driven according to a row driving method, and a micro controller unit configured to generate a gate control signal for driving the plurality of gate lines and the input data packet.
    Type: Grant
    Filed: December 16, 2022
    Date of Patent: July 30, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Yun Sung Wang, Soon Hyeok Kwak, Jang Su Kim, Sang Suk Kim
  • Patent number: 11963273
    Abstract: The present embodiment relates to a communication protocol between an MCU and an LED driving circuit for LED driving. The MCU may define and use an SPI protocol including ID setting, a command, configuration data, etc.
    Type: Grant
    Filed: October 26, 2022
    Date of Patent: April 16, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Sang Suk Kim, Jang Su Kim, Jong Min Lee
  • Patent number: 11948487
    Abstract: The present disclosure provides a current mirror circuit including a first transistor configured to be supplied with a data current from a data driving circuit; a second transistor configured to drive a light emitting diode by mirroring the data current transferred to the first transistor; a capacitor disposed between the first transistor and the second transistor and configured to store a voltage of a gate terminal of the second transistor therein; and a first switch disposed between the first transistor and the second transistor and configured to adjust an input current of the gate terminal of the second transistor.
    Type: Grant
    Filed: September 9, 2022
    Date of Patent: April 2, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Ji Hwan Kim, Sang Suk Kim, Jang Su Kim
  • Patent number: 11922880
    Abstract: A current supply circuit according to the present disclosure may include a voltage/current converter configured to convert, into a data current, a data voltage received from a data driving circuit and a first current mirror circuit configured to mirror the data current so that a light-emitting diode (LED) current flows into an LED array. The data current may be adjusted based on a greyscale value of the LED array.
    Type: Grant
    Filed: November 22, 2022
    Date of Patent: March 5, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Jong Min Lee, Kyeong Rok Lee, Sang Suk Kim, Jang Su Kim
  • Publication number: 20240049370
    Abstract: an LED driving circuit for controlling the voltage of an LED backlight system, and to a technology for controlling the driving voltage of an LED string formed at one end of the LED string through a digital counter by monitoring the output voltage of the LED string.
    Type: Application
    Filed: March 31, 2023
    Publication date: February 8, 2024
    Applicant: LX Semicon Co., Ltd.
    Inventors: Sang Suk KIM, Jang Su KIM, Ji Hwan KIM, Kyeong Rok LEE, Jong Min LEE
  • Patent number: 11889599
    Abstract: The present disclosure provides a technology for precisely controlling an LED driving current using fine current trimming data stored in a memory when driving an LED.
    Type: Grant
    Filed: December 1, 2022
    Date of Patent: January 30, 2024
    Assignee: LX SEMICON CO., LTD.
    Inventors: Ji Hwan Kim, Jang Su Kim
  • Publication number: 20230316993
    Abstract: An LED driving circuit adjusts a PWM driving frequency in light emitting diode driving, and changes a PWM frequency of an LED driving circuit in response to a frequency of a PWM clock signal delivered externally or internally.
    Type: Application
    Filed: March 31, 2023
    Publication date: October 5, 2023
    Applicant: LX Semicon Co., Ltd.
    Inventors: Sang Suk KIM, Jang Su KIM, Ji Hwan KIM, Jong Min LEE, Kyeong Rok LEE
  • Patent number: 11710446
    Abstract: The present disclosure relates to an LED driving technology. According to the present disclosure, it is possible to increase the fineness of the gray scale without increasing a frequency of a clock by combining a plurality of driving current sources to generate a driving current supplied to one driving line.
    Type: Grant
    Filed: July 15, 2021
    Date of Patent: July 25, 2023
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Ji Hwan Kim, Jin Ho Choi, Jang Su Kim
  • Publication number: 20230217561
    Abstract: The present embodiment relates to a communication protocol between an MCU and an LED driving circuit for LED driving. The MCU may define and use an SPI protocol including ID setting, a command, configuration data, etc.
    Type: Application
    Filed: October 26, 2022
    Publication date: July 6, 2023
    Inventors: Sang Suk KIM, Jang Su KIM, Jong Min LEE
  • Publication number: 20230217564
    Abstract: The present embodiment relates to a technology for facilitating an increase of the number of LEDs to be driven by communication of a clock signal between chips forming a daisy chain when driving LEDs. The communication of a clock signal as well as data between chips allows improve the synchronization between the clock signal and data.
    Type: Application
    Filed: October 26, 2022
    Publication date: July 6, 2023
    Inventors: Sang Suk KIM, Jang Su KIM, Ji Hwan KIM, Kyeong Rok LEE, Jong Min LEE
  • Publication number: 20230199927
    Abstract: A hybrid dimming control device, which prevents image quality degradation during local dimming of a backlight unit, includes an analysis circuit configured to determine a type of dimming data for controlling the local dimming of a light source included in a backlight unit by analyzing the dimming data, a pulse width modulation (PWM) dimming control circuit configured to control the local dimming of the light source by a PWM method when the type of the dimming data is a first type, and an active dimming control circuit configured to convert some bits of the dimming data into an analog signal and control the local dimming of the light source using the analog signal when the type of the dimming data is a second type.
    Type: Application
    Filed: December 16, 2022
    Publication date: June 22, 2023
    Inventors: Yun Sung WANG, Sang Suk KIM, Jang Su KIM
  • Publication number: 20230197021
    Abstract: A system for controlling backlight unit capable of reducing a time difference between an image displayed on a display panel and local dimming of the backlight unit, includes a plurality of dimming control devices configured to receive an input data packet including dimming data, and control local dimming of a light source, which is included in a region assigned in advance in a backlight unit, using the dimming data, a plurality of gate lines configured to electrically connect a predetermined number of dimming control devices and configured to be sequentially driven according to a row driving method, and a micro controller unit configured to generate a gate control signal for driving the plurality of gate lines and the input data packet.
    Type: Application
    Filed: December 16, 2022
    Publication date: June 22, 2023
    Inventors: Yun Sung WANG, Soon Hyeok KWAK, Jang Su KIM, Sang Suk KIM
  • Publication number: 20230180363
    Abstract: The present disclosure provides a technology for precisely controlling an LED driving current using fine current trimming data stored in a memory when driving an LED.
    Type: Application
    Filed: December 1, 2022
    Publication date: June 8, 2023
    Applicant: LX Semicon Co., Ltd.
    Inventors: Ji Hwan KIM, Jang Su KIM
  • Publication number: 20230178024
    Abstract: A current supply circuit according to the present disclosure may include a voltage/current converter configured to convert, into a data current, a data voltage received from a data driving circuit and a first current mirror circuit configured to mirror the data current so that a light-emitting diode (LED) current flows into an LED array. The data current may be adjusted based on a greyscale value of the LED array.
    Type: Application
    Filed: November 22, 2022
    Publication date: June 8, 2023
    Inventors: Jong Min LEE, Kyeong Rok LEE, Sang Suk KIM, Jang Su KIM