公开(公告)号：US20240049370A1

公开(公告)日：2024-02-08

申请号：US18194097

申请日：2023-03-31

申请人： LX Semicon Co., Ltd.

发明人： Sang Suk KIM ,  Jang Su KIM ,  Ji Hwan KIM ,  Kyeong Rok LEE ,  Jong Min LEE

IPC分类号： H05B45/14 ,  H05B45/38 ,  H05B45/325 ,  H05B45/40

CPC分类号： H05B45/14 ,  H05B45/38 ,  H05B45/325 ,  H05B45/40

摘要： 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.

公开(公告)号：US20230316993A1

公开(公告)日：2023-10-05

申请号：US18193808

申请日：2023-03-31

申请人： LX Semicon Co., Ltd.

发明人： Sang Suk KIM ,  Jang Su KIM ,  Ji Hwan KIM ,  Jong Min LEE ,  Kyeong Rok LEE

IPC分类号： G09G3/32

CPC分类号： G09G3/32 ,  G09G2320/0247 ,  G09G2340/0407 ,  G09G2320/0633

摘要： 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.

公开(公告)号：US20240147592A1

公开(公告)日：2024-05-02

申请号：US18499976

申请日：2023-11-01

申请人： LX SEMICON CO., LTD.

发明人： Byung Jun SEO ,  Ji Hwan KIM ,  Young Jin WOO ,  Jong Min LEE ,  Ju Pyo HONG

IPC分类号： H05B45/44 ,  H05B45/14

CPC分类号： H05B45/44 ,  H05B45/14

摘要： The present disclosure relates to a light emitting diode (LED) driving device that may expand a usable range of LED current and battery voltage by reducing heat generation of an integrated circuit, and an LED lighting device including the same, which may include a current controller that constantly controls an LED current flowing through an LED string and an IC heat dissipation part connected to a node between the LED string and the current controller to dissipate IC heat of the current controller, wherein when a battery voltage supplied to the LED string increases, the IC heat dissipation part reduces a first LED current flowing from the LED string to the current controller and simultaneously increases a second LED current flowing from the LED string to the current controller via the IC heat dissipation part, thereby reducing the IC heat generation of the current controller.

公开(公告)号：US20230217561A1

公开(公告)日：2023-07-06

申请号：US17974321

申请日：2022-10-26

申请人： LX Semicon Co., Ltd.

发明人： Sang Suk KIM ,  Jang Su KIM ,  Jong Min LEE

IPC分类号： H05B45/14 ,  H05B45/325

CPC分类号： H05B45/14 ,  H05B45/325

摘要： 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.

公开(公告)号：US20230217564A1

公开(公告)日：2023-07-06

申请号：US17974288

申请日：2022-10-26

申请人： LX Semicon Co., Ltd.

发明人： Sang Suk KIM ,  Jang Su KIM ,  Ji Hwan KIM ,  Kyeong Rok LEE ,  Jong Min LEE

IPC分类号： H05B45/325 ,  G02F1/13357 ,  G02F1/1335 ,  H05B45/33

CPC分类号： H05B45/325 ,  G02F1/133603 ,  G02F1/133514 ,  H05B45/33

摘要： 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.

公开(公告)号：US20230178024A1

公开(公告)日：2023-06-08

申请号：US17992474

申请日：2022-11-22

申请人： LX Semicon Co., Ltd.

发明人： Jong Min LEE ,  Kyeong Rok LEE ,  Sang Suk KIM ,  Jang Su KIM

IPC分类号： G09G3/3241

CPC分类号： G09G3/3241 ,  G09G2310/027 ,  G09G2320/0233

摘要： 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.