handscreen

Handscreen refers to a type of privacy filter applied to electronic device screens, such as smartphones, tablets, and laptops. Its primary function is to limit the viewing angle of the display, preventing people beside the user from easily seeing the content on the screen. This is achieved through a layer of micro-louvers or a polarizing film that restricts the light's direction.

Handscreens are typically made of plastic or glass and adhere to the device's screen, either magnetically or with adhesive. They are popular in public spaces like airplanes, coffee shops, and offices where sensitive information might be displayed. The technology behind handscreens is similar to that used in privacy screens for computer monitors.

The effectiveness of a handscreen is measured by its viewing angle limitation. A narrower viewing angle offers greater privacy but can also make it more difficult for the user to view the screen comfortably, especially if they move their head or the device. Manufacturers often specify the viewing angle, commonly ranging from 30 to 60 degrees. While handscreens enhance privacy, they can sometimes reduce screen brightness and clarity, and may also affect touch sensitivity.