# US 2023/0056903 A1 · Display apparatus and control method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0056903 A1 - Document ID: US20230056903A1 - Status: Published application - Kind: A1 - Application number: 17/573,937 - Filed: 2022-01-12 - Published: 2023-02-23 - Earliest claimed: 2021-08-20 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Jiwon LEE; Sungyong JOO; Junhyun WON - Web page: https://patentgrep.com/patent/US20230056903A1 ## CPC - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - H05B 45/10: Controlling the intensity of the light - H05B 45/325: Pulse-width modulation [PWM] - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/064: by time modulation of the brightness of the illumination source - G09G 2330/021: Power management, e.g. power saving - 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) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A display apparatus includes a power supply device. The power supply device includes a power supply part and an integrated circuit chip. The power supply part outputs a first power to drive a backlight and a second power to drive a main circuit. The integrated circuit chip increases, based on a control signal to adjust a brightness of the backlight being received, a current value of the second power, and reduces, based on the control signal not being received for a first threshold time, the current value of the second power. ## Claims ### Claim 1 A display apparatus comprising a power supply device, the power supply device comprising: a power supply part configured to output a first power to drive a backlight and a second power to drive a main circuit; and an integrated circuit (IC) chip configured to increase, based on a control signal to adjust a brightness of the backlight being received, a current value of the second power, and reduce, based on the control signal not being received for a first threshold time, the current value of the second power. ### Claim 2 (depends on 1) The display apparatus of claim 1, wherein the power supply part comprises: a first output end configured to output the first power; and a second output end configured to output the second power, wherein the power supply device further comprises: a dummy circuit connected to the first output end, and wherein the IC chip is configured to detect a voltage of the first output end, and prevent, based on the detected voltage being greater than or equal to a first threshold value, a voltage of the first power from rising by turning on the dummy circuit. ### Claim 3 (depends on 2) The display apparatus of claim 2, wherein the dummy circuit comprises a transistor disposed between the first output end and a ground, and wherein the IC chip is configured to prevent the voltage of the first power from rising by turning on the transistor based on the detected voltage being greater than or equal to the first threshold value. ### Claim 4 (depends on 3) The display apparatus of claim 3, wherein the IC chip is configured to turn off the transistor based on a voltage detected while the transistor is in a turned on state decreasing to a voltage less than the first threshold value. ### Claim 5 (depends on 4) The display apparatus of claim 4, wherein the power supply part further comprises: a capacitor connected to the first output end, wherein the IC chip is configured to discharge the capacitor by turning on the transistor for a second threshold time based on the detected voltage decreasing to a voltage less than a second threshold value, which is less than the first threshold value. ### Claim 6 (depends on 2) The display apparatus of claim 2, further comprising: a feedback circuit connected to the second output end, wherein the feedback circuit is configured to provide a feedback signal to the power supply part based on a voltage magnitude of the second output end. ### Claim 7 (depends on 1) The display apparatus of claim 1, wherein the control signal comprises at least one of a pulse width modulation signal or an amplitude dimming signal. ### Claim 8 (depends on 1) The display apparatus of claim 1, wherein the control signal is received by the IC chip according a user command for turning on the display apparatus. ### Claim 9 (depends on 1) The display apparatus of claim 1, wherein the IC chip is configured to: change an operation mode of the display apparatus to a first mode by increasing the current value of the second power, and change the operation mode of the display apparatus to a second mode by reducing the current value of the second power. ### Claim 10 (depends on 9) The display apparatus of claim 9, wherein the first mode is a normal mode, and the second mode is a low power mode. ### Claim 11 A control method of a display apparatus, the method comprising: outputting, by a power supply part, a first power to drive a backlight and a second power to drive a main circuit; and increasing, by an integrated circuit (IC) chip, a current value of the second power based on a control signal to adjust a brightness of the backlight, and reducing, based on the control signal not being received for a first threshold time, the current value of the second power. ### Claim 12 (depends on 11) The method of claim 11, further comprising: detecting, by the IC chip, a voltage of a first output end of the power supply part, the first output end being configured to output the first power; and preventing, based on the detected voltage being greater than or equal to a first threshold value, a voltage of the first power from rising by turning on, by the IC chip, a dummy circuit connected to the first output end. ### Claim 13 (depends on 12) The method of claim 12, wherein the preventing comprises turning on, by the IC chip, a transistor in the dummy circuit, and the transistor is disposed between the first output end and a ground. ### Claim 14 (depends on 13) The method of claim 13, further comprising: turning off, by the IC chip, the transistor based on the voltage detected while the transistor is in a turned on state decreasing to a voltage less than the first threshold value. ### Claim 15 (depends on 14) The method of claim 14, further comprising: discharging, based on the detected voltage decreasing to a voltage less than a second threshold value, a capacitor in the power supply part by turning on, by the IC chip, the transistor for a second threshold time, wherein the second threshold value is less than the first threshold value, and wherein the capacitor is connected to the first output end. ### Claim 16 A display apparatus comprising a power supply device, the power supply device comprising: a power supply part configured to output a first power to drive a backlight and a second power to drive a main circuit; and an integrated circuit (IC) chip configured to change an operation mode of the display apparatus to a low power mode from a normal mode, based on a control signal to adjust a brightness of the backlight not being received for a first threshold time. ### Claim 17 (depends on 16) The display apparatus of claim 16, wherein the IC chip changes the operation mode to the low power mode by reducing a current value of the second power. ### Claim 18 (depends on 16) The display apparatus of claim 16, wherein the power supply part comprises: a first output end configured to output the first power; and a second output end configured to output the second power, wherein the power supply device further comprises: a dummy circuit connected to the first output end and comprising a transistor disposed between the first output end and a ground, and wherein the IC chip is configured to detect a voltage of the first output end, and prevent, based on the detected voltage being greater than or equal to a first threshold value, a voltage of the first power from rising by turning on the transistor. ### Claim 19 (depends on 18) The display apparatus of claim 18, wherein the IC chip is configured to turn off the transistor based on a voltage detected while the transistor is in a turned on state decreasing to a voltage less than the first threshold value. ### Claim 20 (depends on 19) The display apparatus of claim 19, wherein the power supply part further comprises a capacitor connected to the first output end, wherein the IC chip is configured to discharge the capacitor by turning on the transistor for a second threshold time based on the detected voltage decreasing to a voltage less than a second threshold value, which is less than the first threshold value.