I / O Shield ( also ATX panel, I / O shield or connector panel, rare I / O Shield, I / O board or I / O shield ) denotes a PC component that the clearances to the rear external ports of a motherboard includes, ensuring the electromagnetic shielding. At the same time it prevented by closing the gap accidental penetration by objects that may endanger the safe operation of the device ( for example, small metal parts, screw, plug or finger).

I / O Shields are used the same dimensions in the ATX, micro - ATX, flex -ATX and mini -ITX formats. It is a resilient piece of sheet metal, which the external Motherboard sockets as PS/2-interface, USB, serial or parallel ports, video interfaces such as VGA, HDMI, DVI or DisplayPort, LAN, inter alia, fit into the 159.2 × 44.9 mm and insert the computer chassis integrates. Since the arrangement of the connections depends on the features and design of the mainboard, the sheet is usually supplied with the motherboard. With PC cases previously partially aperture were included that met the original designs from Intel. Today, this is not usual. Some housing were built so that they could take AT and ATX motherboards. To this end, an I / O Shield was used, which had spared only the five -pin DIN connector for AT / XT keyboards.


An I / O Shield is primarily used to shield the casing from electromagnetic radiation and secondarily as a protection against the ingress of unwanted particles. Therefore, the plates are equipped with punched out contact clips to the back jacks. I / O Shields are shaped so that they snap firmly into place in the housing window.

Since peripheral devices connected to the PC to be electrostatically charged or even potential differences between the connected device and the PC can exist, thus the existing charge when connected via the housing must be derived. Through the I / O, the external shield motherboard connectors are connected to the housing.