What Is a Display Extender?
A display extender is a device that extends video signal reach beyond the limitations of a standard display cable. It enables a display to receive signals from a distance, essential for setups where the display and signal source are far apart.
The device comprises a transmitter near the PC, a receiver for video signals, and a cable connecting the two. Display extenders can handle both analog and digital signals, with digital systems offering higher image quality.
Usage of Display Extenders
Display extenders are widely used in various settings. In hospitals, they allow for the display of images on remote screens, especially useful where space constraints prevent the installation of large video output devices. This leads to a simple setup comprising just the wiring and display.
In industrial settings, they connect server rooms to monitoring rooms, especially when the distance is substantial. LAN cables are often used for their flexibility and bending capacity compared to standard display cables.
Principle of Display Extender
A Display extender operates as a signal converter. Using a LAN cable, it converts HDMI or VGA standard electrical signals to Ethernet standard at the transmitter. At the receiver, the conversion is reversed to output video signals. When an optical cable is used, conversions between electrical and optical signals are facilitated using devices like photodiodes. This process is akin to media converters.
Other Information on Display Extenders
Cables Used for Display Extenders
Aside from LAN cables, optical cables are also employed for display extenders, particularly useful for long-distance connections. Traditional VGA cables have largely become obsolete. HDMI cables are now common, with LAN cables effective up to 100 meters. Beyond this, a hub is required.
LAN cables are cost-effective, easy to fabricate, and can be custom-lengthened with basic tools. Optical cables can extend several kilometers but are impact-sensitive and need specific devices for connection. For short distances, HDMI direct connection is preferred, LAN cables for up to 100 meters, and optical cables for longer distances. Additionally, optical cables are beneficial in environments with electromagnetic interference, as they are not affected by such disturbances.