Consistent Reflectivity: Projection screens are engineered with uniform surface materials that reflect light evenly, ensuring consistent brightness and color across the entire image. Walls often have texture, paint sheen variations, or subtle discolorations that can distort the picture.

Optimized Gain and Viewing Angle: Screens are designed with specific gain levels and diffusion characteristics to balance brightness and viewing angles. A white wall typically has low and unpredictable gain, which may result in a dimmer or uneven image.

Color Accuracy: High-quality screen materials maintain better color fidelity. Many white paints contain additives or tints (e.g., “off-white” or blue undertones) that can skew colors in your projected image.

Reduced Hotspots and Glare: Projection screens minimize hotspots and ambient light reflections better than most walls, especially glossy or semi-gloss paints.

Professional Appearance: A proper screen provides a clean, framed image with defined borders, enhancing the viewing experience and aesthetic.