Technically, you can project onto any light background. But for high-quality experience, you’ll want to avoid classic methods like using a white bedsheet. While this can be effective in a pinch, you’re bound to have wrinkles, and cotton sheets aren’t uniform on the surface. A proper projection screen is perfectly smooth, so nothing distracts from the content you’re watching. Even with projectors of a lesser quality, a screen will provide more accurate and brighter colors.