# US 7,609,255 B2 · Supplying power from a display device to a source using a standard DVI video cable

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- Number: US 7,609,255 B2
- Document ID: US7609255B2
- Status: Granted
- Kind: B2
- Application number: 11/192,679
- Filed: 2005-07-29
- Published: 2007-02-01
- Granted: 2009-10-27
- Earliest claimed: 2005-07-29
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: John W. Frederick; Christopher D. Voltz
- Web page: https://patentgrep.com/patent/US7609255B2

## CPC

- G09G 5/006: {Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04)}
- G09G 2330/02: Details of power systems and of start or stop of display operation
- G09G 2370/047: using display data channel standard [DDC] communication
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The system of claim 1, wherein:
the source unit comprises a video source configured to transmit video signals over wires of the DVI-compliant video cable that are conventionally used to transmit video signals; and
the video source receives its main power supply from pin 14 of the DVI-compliant video cable.

### Claim 3 (depends on 1)

The system of claim 1, wherein the source unit is a media box.

### Claim 4 (depends on 1)

The system of claim 1, wherein the source unit is a personal computer.

### Claim 5

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.

### Claim 6 (depends on 5)

The method of claim 5, further comprising:
using power supplied by the display device on pin 14 of the cable to operate a video source in the source unit; and
transmitting video signals from the source unit to the display device over the DVI-compliant cable.

### Claim 7

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.