Landscape is the most popular video display orientation and has an average ratio of 4:3 units (wide to vertical). Larger wide-screen displays have a 16:9 ratio.

Image rotation between landscape and portrait modes is a default feature for most software applications. However, not all OSs support this capability. For example, Windows XP Service Pack 3 conflicts with this feature on multiple graphics cards.

Issues may arise with rotating cathode ray tube (CRT) monitors after changing from landscape to portrait mode, as follows:

• Inadequate air flow
• Non-functioning cooling vents
• Unstable display when shifted 90 degrees, resulting in case flexing or cracking
• Some magnetic effects must be degaussed in the new orientation for correct display on color CRT screens.