US Patent No. 10,176,140

HDMI APPARATUS OF HIGH-DEFINITION TV HAS SWITCHING CIRCUIT THAT OUTPUTS LOW-LEVEL/GROUND POTENTIAL TO SECOND PIN OF HDMI CONNECTOR IF A FIRST SIGNAL IS NOT OUTPUTTED


Patent No. 10,176,140
Issue Date January 08, 2019
Title Hdmi Apparatus Of High-definition Tv Has Switching Circuit That Outputs Low-level/ground Potential To Second Pin Of Hdmi Connector If A First Signal Is Not Outputted
Inventorship Kazuyuki Koyanagi, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 10,176,140

1. An electronic device, comprisinga connector to which an external device is connected via a signal cable and that includes at least first and second pins, a predetermined voltage being supplied from the external device to the first pin;
an integrated circuit (IC) that includes a communicator to which a signal is input from the external device via a pin other than the first and second pins of the connector and that outputs, when the communicator is in an activated state, a first signal that indicates that the communicator is in the activated state; and
a switch circuit that outputs to the external device via the second pin, when the first signal has not been outputted by the integrated circuit in a state in which the predetermined voltage is supplied from the external device to the first pin, a first detection signal indicating that a connection of the communicator has not been established with the external device.