Sony Corporation

Sony Electronics Inc

Tetsuya Nomura

Peter Rae Shintani

Satoru Suzuki

Eiji Kono

Paul Doyle

A circuit for detection of an HDMI source device to an HDMI sink device through an HDMI sink connector without regard for the activity state of the HDMI source device has a pull-up resistor having first and second terminals with the first terminal coupled to a DC power source. A switching device is coupled between the pull-up resistor's second terminal and ground at a circuit node. The switching device is switched on to couple the circuit node to ground when power is applied to a control terminal thereof from the HDMI sink connector power pin, and being switched off otherwise. The circuit node is coupled to a DDC/CEC GROUND pin of the HDMI sink connector. The circuit node is readable as a binary signal to indicate the presence of a source device to the HDMI sink connector, wherein the node exhibits a logic low signal when either the node is grounded by the DDC/CEC GROUND pin connection to a source device or when the switching device is switched on. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

HDMI source detection

An image display device capable of reducing power consumption with improved effectiveness even when a sync signal sensor fails to sense both horizontal and vertical sync signals, wherein when a first sync signal sensor fails to sense both horizontal and vertical sync signals, a main power source, a heater power source device, and a first sync signal sensor power source device are turned off. Power is thus saved. When a second sync signal sensor senses at least one of the horizontal and vertical sync signals, the first sync signal sensor power source device that was turned off is turned on.

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Kanagawa, Japan

Tetsuya Nomura