US Patent No. 9,715,473

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. 9,715,473
Issue Date July 25, 2017
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. 9,715,473

1. An electronic device, comprising:
a connector to which an external device is connected to 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;

a controller that includes a communication unit 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 communication unit is in an activated state, a first signal
that indicates that the communication unit is in the activated state; and

an output unit that outputs to the external device via the second pin, when the first signal has not been outputted by the
controller, a first detection signal indicating that a connection of the communication device has not been established with
the external device.