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US 6,532,512 B1Granted
Selectively coupling an upstream terminal to a USB hub circuit in accordance with a video sync signal
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiromitsu Torii, Hirokatsu Yui
Life of this patent
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Abstract
A universal-serial-bus (“USB”) hub circuit includes a switch circuit connected to a USB hub section and a plurality of upstream terminals each of which is adapted to be connected to computers. The USB hub circuit also includes a selector that operates the switch circuit to couple the USB hub section to a selected upstream terminal. A display device incorporates the USB hub circuit. A video sync signal output by an active host computer coupled to one of the upstream terminals determines which upstream terminal is to be coupled to the USB hub circuit.
Claims3
A display device comprising:
- a universal-serial-bus (“USB”) hub section;
- a plurality of upstream terminals which are adapted to be connected to computers;
- a first switch circuit connected to the USB hub section and the plurality of upstream terminals;
- a video display circuit;
- a plurality of video and sync. signal-input-terminals which are adapted to be connected to the computers;
- a second switch circuit connected to the video display circuit and the plurality of video and sync. signal-input-terminals;
- and
- a controller for identifying an active computer based on a signal provided by said second switch circuit, and for connecting the USB hub section to an upstream terminal connected to the active computer by operating said first switch circuit.
5 more elements
Dependencies are inferred from the claim text.