Patent ID: 7899942

Claim:
A switch device applicable in a server having at least double display connectors, the switch device comprising: a display chip set for providing a plurality of video signals; a switch unit connected to said display chip set for receiving at least one of the video signals and switching an output path of said received video signal; a logic unit connected to said display chip set for receiving at least one of the video signals and switch an output path of said received video signal; a first connector connected to said switch unit and said logic unit for selectively connecting to a display; and a second connector connected to said switch unit and said logic unit for selectively connecting to a display, wherein said switch unit comprises a switch for selectively connecting said switch unit to said first connector or to said second connector, wherein, when said second connector is not connected to the display, the switch is connected to said first connector, and said switch unit and said logic unit provide the video signals to said first connector, wherein, when said second connector is connected to the display, said second connector provides a control signal to said switch unit and said logic unit, then the switch is connected to said second connector, and said switch unit and said logic unit provide the video signals to said second connector, wherein, when the display is plugged in said second connector, a VIDEO_IN_USE is shorted to ground by said second connector and becomes LOW, thereafter a tri-color signal in the video signals is switched to said second connector, and wherein, when the display is not plugged in said second connector, the VIDEO_IN_USE is pulled HIGH by a resistor, thereafter the tri-color signal is switched to be connected to said first connector, and a signal wire is connected to another resistor which is used to convert a current source to a voltage.