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The purpose of a projection screen in an AV setup is fundamentally linked to enhancing image quality and visibility in a viewing environment. A quality projection screen is designed to reflect light from the projector in a way that maximizes the perceived brightness, contrast, and clarity of the image. This is particularly important because the characteristics of the surface greatly influence how well the projected image is seen by the audience.

Projection screens are specifically engineered to have materials and finishes—including gain and texture—that optimize the viewing experience by providing a smooth, reflective surface that minimizes distortion. A well-chosen screen can significantly improve the overall effectiveness of the AV setup by ensuring that the projected content is easily visible from various distances and angles, making it ideal for larger audiences.

Although aspects like reducing ambient light (which is essential for projection quality) and providing a direct surface for projection are important, these are secondary to the overall goal of ensuring maximum image visibility and quality. The other options, such as housing the projector, focus on function rather than the primary purpose that directly impacts the audience's viewing experience.