A screen switch or display switch is a device that makes it possible to connect multiple video sources to one or more screens. It is often used with computers, gaming consoles, streaming devices or in home cinemas.
The technology of the screen switch focuses exclusively on video output. One of the main functions is to be able to change the video source when using only one monitor. Conversely, the screen switch can be used to ensure the output of one image source on several monitors or televisions.
In principle, the screen switch is similar to a KVM-Switch (keyboard, video, mouse). However, KVM technology is far more comprehensive and flexible. In addition to switching between the video sources, it can also be used to control the CPUs with just a few input devices.
Anyone using a screen switch, for example, needs separate input devices for each connected device. This can cause difficulties, especially at workstations. Even if there is only one monitor at the desk, for example, without KVM technology four computers each have to be controlled with a keyboard and mouse. The result is confusion.
More than just a display switch
KVM systems such as DisplayPort-Switches or DVI-Switches can also distribute the video signal like a screen switch in addition to controlling the input devices. Even resolutions of up to 4k are possible without latency. Analog signals can also be processed via a VGA-Switch or even a DVI switch.
Despite the advantages of a KVM switch, both technologies have a few things in common:
Both types of switches save space and money by reducing the number of peripherals required.
Both can help organize the workspace and reduce cable clutter.
Both offer the ability to switch between different input sources, albeit to different degrees.
Due to their limitations compared to the KVM variant, screen switches are therefore only used where only video output switching is required. Good examples of this are environments for presentations or simple video surveillance. Where complete control over all systems is required, KVM technology must be used.
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