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US 7,609,255 B2Granted
Supplying power from a display device to a source using a standard DVI video cable
AssigneeHewlett-Packard Development Company, L.P.
InventorsJohn W. Frederick, Christopher D. Voltz
Life of this patent
Estimating the term…
Abstract
A source unit is configured to receive its main power supply from pin 14 of a DVI-compliant cable connector. A display device is operable to connect its power supply to pin 14 of a DVI-compliant cable connector to accommodate the main power requirements of a source unit.
Claims7
A system, comprising:
- a source unit, a display device and a DVI-compliant video cable coupling the source unit to the display device;
- wherein:
- the source unit is configured to receive its main power supply from pin 14 of the DVI-compliant video cable, but also comprises a DDC/CI communications capability powered by +5V supplied by the display device on pin 16 of the DVI-compliant video cable;
- the display device comprises a switch for connecting pin 14 of the DVI-compliant video cable to, or disconnecting it from, a power supply;
- and
- the switch is operable responsive to a DDC/CI command received by the display device from the source unit.
3 more elements
An operating method for a source unit and display device coupled to one another by a DVI-compliant cable, comprising:
- initializing the display device to a first state wherein the display device supplies +5V to pin 16 of the cable and does not connect pin 14 of the cable to a power supply in the display device;
- using the +5V on pin 16 of the cable to supply power to DDC/CI communications logic in the source unit and initializing the DDC/CI communications logic;
- sending a command from the DDC/CI communications logic in the source unit to corresponding logic in the display device, the command for enabling a second state in the display device;
- in the display device, entering the second state responsive to the command, wherein the second state comprises connecting pin 14 of the cable to the power supply.
1 more element
A system, comprising:
- a source unit coupled to a display device by a DVI-compliant cable;
- means in the source unit for using +5V on pin 16 of the cable to power itself and send a DDC/CI command to the display device, the command for requesting the display device to connect a power supply in the display device to pin 14 of the cable;
- and
- means in the display device for connecting the power supply to pin 14 of the cable responsive to the command.
1 more element
Dependencies are inferred from the claim text.