# US 11,451,160 B2 · Image display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,160 B2 - Document ID: US11451160B2 - Status: Granted - Kind: B2 - Application number: 16/727,749 - Filed: 2019-12-26 - Published: 2020-07-02 - Granted: 2022-09-20 - Earliest claimed: 2018-12-26 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Dohoon Kim - Web page: https://patentgrep.com/patent/US11451160B2 ## CPC - H02M 7/217: using semiconductor devices only - H02M 7/219: in a bridge configuration - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2330/021: Power management, e.g. power saving - G09G 2330/022: in absence of operation, e.g. no data being entered during a predetermined time - H02M 1/0035: {using burst mode control} - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - H02M 1/0054: {Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035)} - H02M 1/0085: {Partially controlled bridges} - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## 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. ## Claims ### Claim 1 An image display apparatus comprising: a display; and a power supply comprising: a converter including at least one switching element and configured to supply power to the display and a controller configured to control the converter; wherein the power supply is 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, wherein the power supply is further configured to operate in a first mode or a second mode, wherein in the first mode the switching operation is continuously performed by the at least one switching element, and in the second mode the switching operation is discontinuously performed by the at least one switching element, wherein the controller is further configured to: determine the mode of operation as the second mode based on a level of a load at the output terminal of the converter being equal to or lower than a first reference level; and determine the mode of operation as the first mode based on the level of the load at the output terminal of the converter being higher than the first reference level and equal to or lower than a second reference level higher than the first reference level. ### Claim 2 (depends on 1) The image display apparatus of claim 1, wherein, in the second mode, the at least one switching element performs a switching operation during a first half cycle among the first half cycle and a second half cycle of a cycle of input AC power, and temporarily stops the switching operation during the second half cycle. ### Claim 3 (depends on 2) The image display apparatus of claim 2, wherein, in the first mode, the at least one switching element continuously performs the switching operation during the first half cycle and the second half cycle. ### Claim 4 (depends on 1) The image display apparatus of claim 1, wherein the power supply further comprises an input voltage detector configured to detect an input AC voltage of the input AC power, and wherein the controller is further configured to determine the mode of operation as the second mode based on the input AC voltage being equal to or higher than a preset input voltage level. ### Claim 5 (depends on 1) The image display apparatus of claim 1, wherein the power supply further comprises a DC terminal voltage detector configured to detect a voltage at an output terminal of the converter, and wherein the controller is further configured to determine the mode of operation as the second mode based on the voltage at the output terminal of the converter being equal to or higher than a first preset level, and wherein the controller is further configured to determine the mode of operation as the first mode based on the voltage at the output terminal of the converter being lower than the first preset level and equal to or higher than a second preset level that is lower than the first preset level. ### Claim 6 (depends on 5) The image display apparatus of claim 5, wherein the controller is further configured to stop the switching operation of the at least one switching element during a period of time longer than a cycle of the input AC power when the voltage at the output terminal of the converter is lower than the second preset level. ### Claim 7 (depends on 1) The image display apparatus of claim 1, wherein the controller is further configured to stop the switching operation of the at least one switching element during a period of time longer than a cycle of input AC power based on the level of the load at the output terminal of the converter being equal to or higher than the second reference level. ### Claim 8 (depends on 1) The image display apparatus of claim 1, wherein the controller is further configured to determine the mode of operation as the second mode based on a black area accounting for a predetermined percentage or more of an area of an image displayed on the display. ### Claim 9 (depends on 8) The image display apparatus of claim 8, wherein a duration of operation in the second mode is increased as a percentage of the black area of the area of the image is increased. ### Claim 10 (depends on 1) The image display apparatus of claim 1, wherein the controller is further configured to: determine the mode of operation as the first mode based on an image displayed on the display being a still image; and determine the mode of operation as the second mode based on the image displayed on the display being a moving image. ### Claim 11 (depends on 1) The image display apparatus of claim 1, wherein the converter comprises: a first diode element and a first switching element connected in series with each other; and a second diode element and a second switching element connected in series with each other and in parallel with the first diode element and the first switching element. ### Claim 12 (depends on 11) The image display apparatus of claim 11, wherein the converter further comprises: a first inductor disposed between a first node and an input terminal, wherein the first node is disposed between the first diode element and the first switching element; and a second inductor disposed between a second node and the input terminal, wherein the second node is disposed between the second diode element and the second switching element.