Valkokankaita

Valkokankaita is Finnish for white projection screens used to display images from projectors. The term valkokankaita is the plural partitive form of valkokangas, literally “white fabric.” These screens are designed to reflect projected light with minimal distortion, providing consistent brightness and color across the viewing area.

Materials and surfaces: Most screens are vinyl-coated fabrics or rigid panels. Common finishes are matte white for broad viewing angles and faithful color, while high-gain surfaces increase brightness in brighter rooms. Some screens employ ambient light rejecting (ALR) technology to improve visibility when there is room lighting.

Forms and installation: Valkokankaita are available as fixed-frame screens, pull-down or electric screens, and portable tripod or floor-stand models. They come in various sizes to suit classrooms, home theaters, or cinema spaces. Screen size and throw distance depend on room dimensions and projector throw ratio; popular aspect ratios include 4:3, 16:9, and 21:9.

Usage and considerations: The screen choice affects brightness, contrast, and viewing angles. In bright environments, ALR or high-gain surfaces can help; in dark rooms, matte white surfaces provide natural color. Proper installation minimizes wrinkles and distortion.

Care: Clean with a soft, dry cloth or a mild damp cloth if necessary; avoid solvents and abrasive cleaners. Follow manufacturer instructions for removable fabrics or motorized screens.

History: The development of dedicated projection screens followed the shift from painted walls to purpose-built surfaces in the 20th century, improving image quality and ease of use in cinemas, classrooms, and homes.