# US 11,909,145 B2 · Detecting circuit and detecting method of external display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,145 B2 - Document ID: US11909145B2 - Status: Granted - Kind: B2 - Application number: 18/097,155 - Filed: 2023-01-13 - Published: 2023-07-27 - Granted: 2024-02-20 - Earliest claimed: 2022-01-25 - Assignees: Getac Technology Corporation - Applicants: Getac Technology Corporation - Inventors: Kuan-Yu Chen; Yao-Wei Yang; Hsueh-Mao Cheng - Web page: https://patentgrep.com/patent/US11909145B2 ## CPC - H01R 13/7036: {the switch being in series with coupling part, e.g. dead coupling, explosion proof coupling} - H02J 1/06: Two-wire DC power distribution systems - G06F 1/263: {Arrangements for using multiple switchable power supplies, e.g. battery and AC (G06F1/30 takes precedence)} - G06F 1/28: Supervision thereof, e.g. detecting power-supply failure by out of limits supervision - G06F 1/3212: Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level - G06F 1/3215: Monitoring of peripheral devices - G06F 1/3218: of display devices - G06F 1/324: by lowering clock frequency - G06F 1/3265: {Power saving in display device} - G06F 1/3278: {Power saving in modem or I/O interface} - G06F 1/3296: by lowering the supply or operating voltage - G06F 3/1423: {controlling a plurality of local displays, e.g. CRT and flat panel display} - G09G 5/006: {Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04)} - H01R 31/065: {with built-in electric apparatus} - H02J 9/005: {using a power saving mode (for copiers G03G15/5004)} - G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant} - G09G 2320/0626: for control of overall brightness - G09G 2330/00: Aspects of power supply; Aspects of display protection and defect management - G09G 2330/022: in absence of operation, e.g. no data being entered during a predetermined time - G09G 2330/026: Arrangements or methods related to booting a display - G09G 2330/027: Arrangements or methods related to powering off a display - G09G 2370/22: Detection of presence or absence of input display information or of connection or disconnection of a corresponding information source - Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A detecting circuit of an external display device includes a first connector, a display circuit configured to provide a display signal to the external display device through the first connector, a switch circuit, a power supply circuit configured to provide power needed for operating the display circuit through the switch circuit when the switch circuit is on, and a control circuit configured to turn on the switch circuit upon detecting the external display device so as to connect the power supply circuit to the display circuit. When the switch circuit is on, the control circuit accumulates a duration or a number of times of detection that the external display device is continually not detected, and then turns off the switch circuit to disconnect the power circuit from the display circuit when the duration reaches a time threshold or the number of times of detection reaches a count threshold. ## Claims ### Claim 1 A detecting circuit of an external display device, comprising: a first connector; a display circuit, coupled to the first connector, configured to provide a display signal to the external display device through the first connector; a switch circuit, coupled to the display circuit; a power supply circuit, coupled to the switch circuit, configured to provide power needed for operating the display circuit through the switch circuit when the switch circuit is on; and a control circuit, coupled to the first connector and the switch circuit, configured to detect the external display device through the first connector and to selectively turn on/off the switch circuit according to a detection result of the external display device; wherein, the control circuit turns on the switch circuit upon detecting the external display device to connect the power supply circuit to the display circuit; after the switch circuit is turned on, the control circuit further accumulates a duration or a number of times of detection that the external display device is continually not detected, and then turns off the switch circuit to disconnect the power supply circuit from the display circuit when the duration reaches a time threshold or the number of times of detection reaches a count threshold. ### Claim 2 (depends on 1) The detecting circuit of an external display device according to claim 1, further comprising: a second connector, coupled to the display circuit; wherein the display circuit receives the display signal from a host through the second connector, converts the display signal from a first signal specification to a second signal specification, and outputs the display signal in the second signal specification to the first connector. ### Claim 3 (depends on 1) The detecting circuit of an external display device according to claim 1, wherein the switch circuit comprises: a power switch, coupled between the display circuit and the power supply circuit, and controlled by the control circuit. ### Claim 4 (depends on 1) The detecting circuit of an external display device according to claim 1, wherein the first connector comprises: a detection pin, coupled to the control circuit, configured to output a plug signal from the external display device to the control circuit; and at least one signal pin, coupled to the display circuit, configured to output the display signal to the external display device. ### Claim 5 (depends on 1) The detecting circuit of an external display device according to claim 1, further comprising: a potential converting circuit, coupled between the first connector and the control circuit. ### Claim 6 (depends on 1) The detecting circuit of an external display device according to claim 1, wherein the control circuit is a microcontroller unit (MCU) or an embedded controller (EC). ### Claim 7 (depends on 1) The detecting circuit of an external display device according to claim 1, wherein the display circuit is a display integrated circuit (IC). ### Claim 8 (depends on 1) The detecting circuit of an external display device according to claim 1, wherein the external display device is a video graphics array (VGA) device, a DisplayPort device or a high-definition multimedia interface (HDMI) device. ### Claim 9 A detecting circuit of an external display device, comprising: a first connector; a display circuit, coupled to the first connector, configured to provide a display signal to a plurality of external display devices through the first connector; a switch circuit, coupled to the display circuit; a power supply circuit, coupled to the switch circuit, configured to provide power needed for operating the display circuit through the switch circuit when the switch circuit is on; and a control circuit, coupled to the first connector and the switch circuit, configured to detect the plurality of external display devices through the first connector and to selectively turn on/off the switch circuit according to a detection result of the plurality of external display devices; wherein, the control circuit turns on the switch circuit upon detecting at least one of the plurality of external display devices to connect the power supply circuit to the display circuit; after the switch circuit is turned on, the control circuit further accumulates a duration or a number of times of detection that the plurality of external display devices are continually not detected, and then turns off the switch circuit to disconnect the power supply circuit from the display circuit when the duration reaches a time threshold or the number of times of detection reaches a count threshold. ### Claim 10 A detecting method of an external display device, comprising: repeatedly detecting the external display device; upon detecting the external display device, connecting a power supply path to a display circuit and supplying power to the display circuit through the power supply path; while the power supply path is connected, accumulating a duration or a number of times of detection that the external display device is continually not detected; and disconnecting the power supply path when the duration reaches a time threshold and the number of times of detection reaches a count threshold. ### Claim 11 (depends on 10) The detecting method of an external display device according to claim 10, further comprising: after the power is supplied to the display circuit through the power supply path, outputting a display signal by the display circuit, and providing the display signal to the external display device through a first connector. ### Claim 12 (depends on 11) The detecting method of an external display device according to claim 11, further comprising: receiving the display signal through a second connector. ### Claim 13 (depends on 12) The detecting method of an external display device according to claim 12, further comprising: converting a signal specification of the display signal by the display circuit. ### Claim 14 (depends on 10) The detecting method of an external display device according to claim 10, wherein the step of connecting the power supply path to the display circuit comprises: turning on a power switch between the display circuit and a power supply circuit. ### Claim 15 (depends on 14) The detecting method of an external display device according to claim 14, wherein the step of disconnecting the power supply path comprises: turning off the power switch. ### Claim 16 (depends on 10) The detecting method of an external display device according to claim 10, wherein the step of repeatedly detecting the external display device comprises: repeatedly detecting a detection pin of a first connector to confirm whether the detection pin receives a plug signal, wherein the external display device is detected when the plug signal is received, otherwise the external display device is not detected when the plug signal is not received.