公开(公告)号：US20240371318A1

公开(公告)日：2024-11-07

申请号：US18580899

申请日：2021-07-21

Applicant: LG ELECTRONICS INC.

Inventor： Dohoon KIM ,  Jinhaeng JANG ,  Kanghyun YOON

IPC: G09G3/3208 ,  G09G3/36 ,  H02H7/125 ,  H02M7/217

Abstract: An image display apparatus is disclosed. The image display apparatus according to an embodiment of the present disclosure includes: a display; and a power supply to supply a driving voltage to the display, wherein the power supply includes: an AC/DC converter comprising at least one switching device and configured to convert an input AC voltage into a DC voltage and output the DC voltage to a dc link; a dc link capacitor disposed at the dc link; an input voltage detector to detect the input AC voltage; a dc link voltage detector to detect a dc link voltage; and a controller to control the AC/DC converter, wherein in response to the detected input AC voltage exceeding a first reference value and the detected dc link voltage being lower than or equal to a second reference value lower than the first reference value, the controller is configured to turn off the switching device in the AC/DC converter. Accordingly, burnout of the dc link capacitor may be prevented.

公开(公告)号：US20230005414A1

公开(公告)日：2023-01-05

申请号：US17757447

申请日：2019-12-19

Applicant: LG ELECTRONICS INC.

Inventor： Dohoon KIM ,  Jinhaeng JANG ,  Seunghun JANG

IPC: G09G3/20 ,  G09G3/3233

Abstract: A display device comprises: a display module including a display panel; a control board for controlling the display module; and a power board for outputting direct current voltage to the display module. The power board changes the pulse frequency of a control signal so as to output direct current voltage adjusted according to changes in the load of the display panel.

公开(公告)号：US20220375406A1

公开(公告)日：2022-11-24

申请号：US17771780

申请日：2019-10-25

Applicant: LG ELECTRONICS INC.

Inventor： Dohoon KIM

IPC: G09G3/3233 ,  H02M7/23

Abstract: An image display device of the present invention comprises a display and a power supply unit, and the power supply unit comprises: a first voltage detection unit that detects an input AC voltage by using a first resistance element; a second voltage detection unit that detects an input AC voltage by using a differential circuit having a capacitor element and a second resistance element; a converter that converts the level of the input voltage on the basis of a switching operation of a switching element so as to output a DC voltage; and a control unit that may control the switching element in the converter to be turned on, on the basis of a first signal detected by the first voltage detection unit or a second signal detected by the second voltage detection unit. As such, the present invention operates stably even when an AC voltage of a square wave is applied.

公开(公告)号：US20250078763A1

公开(公告)日：2025-03-06

申请号：US18795840

申请日：2024-08-06

Applicant: LG ELECTRONICS INC.

Inventor： Dohoon KIM

IPC: G09G3/3258 ,  H02M3/06

Abstract: The image display apparatus according to an embodiment of the present disclosure includes: a display; a signal processing device; and a power supply to supply a display driving voltage to the display, wherein the power supply includes a converter including switching elements and to convert a level of an input DC voltage and output the display driving voltage, wherein in response to a load at an output terminal of the converter, the converter is configured to operate in a first mode, in which the switching elements perform a continuous switching operation at a first frequency, and in a second mode in which the switching elements perform the continuous switching operation and then stop the switching operation for a predetermined period or perform the switching operation at a second frequency lower than the first frequency. Accordingly, it is possible to reduce increase of output voltage under low-load or no-load conditions.

公开(公告)号：US20220165204A1

公开(公告)日：2022-05-26

申请号：US17456343

申请日：2021-11-23

Applicant: LG ELECTRONICS INC.

Inventor： Dohoon KIM

IPC: G09G3/20

Abstract: An image display apparatus is disclosed. The image display apparatus includes a display and a power supply configured to supply driving voltage to the display, wherein the power supply includes a converter to convert input AC voltage into DC voltage and a controller to control the converter, the converter includes a first leg including a first switching device and a second switching device connected to each other in series and a second leg including a first diode and a second diode connected to each other in series, the first diode and the second diode connected to the first leg in parallel, and the controller controls on time of the first switching device to gradually increase from a first level to a second level for a first period for which the input AC voltage rises after a zero crossing point.

公开(公告)号：US20200212810A1

公开(公告)日：2020-07-02

申请号：US16727749

申请日：2019-12-26

Applicant: LG ELECTRONICS INC.

Inventor： Dohoon KIM

IPC: H02M3/335 ,  G09G3/20

Abstract: Disclosed is an image display apparatus including: a display; and a power supply configured to supply power to the display; wherein the power supply comprises a converter including at least one switching element and configured to output direct-current (DC) power by converting a level of input power based on a switching operation of the at least one switching element, and wherein, a first mode where the at least one switching element performs a switching operation continuously or a second mode where the at least one switching element stops the switching operation are performed according to a load at an output terminal of the converter. Accordingly, power consumption required to display an image may be reduced.