Patent ID: 11909145
Assignee: GETAC TECHNOLOGY CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
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.