METHOD AND APPARATUS FOR DISPLAYING A VIDEO SIGNAL ON A COMPUTER SYSTEM

摘要

A system that displays a video signal on a display for a computer system is presented. During operation, the system receives a signal to switch from displaying a video signal from an internal video source to displaying a video signal from an external video source. In this system, the internal and external video sources are coupled to a bi-directional video port for the computer system, wherein the internal video source generates an output video signal and the external video source generates an input video signal. The system then determines whether the external video source is coupled to the bi-directional video port. If so, the system couples the external video source to the display and determines whether the external video source is a valid video source. If the external video source is a valid video source, the system displays the video signal from the external video source on the display.

主权项

1. An electronic device, comprising:
a first computer system, comprising:
a display configured to display image data;a graphics processor communicatively coupled to the display and configured to transmit internal image data to the display;a bi-directional image data port, wherein the bi-directional image data port comprises an external port of the first computer system configured to receive external image data to be displayed on the display from an external image data source of a second computer system;a switching device configured to switch the display from displaying the internal image data of the first computer system to displaying the external image data of the second computer system, wherein the external image data source of the second computer system is configured to transmit the external image data to the bi-directional port; andcontrol circuitry configured to determine whether the external image data source of the second computer system is coupled to the bi-directional image data port based at least in part on whether an indication signal received at the bi-directional image data port is asserted.