To provide an improved material suitable for use as a front projection screen or for use in a reflection sign or analog applications by improving a light diffusion screen suitable for used as a rear surface projection screen, and a process for producing such materials.

At the time of subjecting the surface of the plastic sheet of a light diffusion screen to a texture treatment, the surface of the sheet is finished to a rough surface such as texture, a surface having fine ruggedness like a brushed surface or a surface given contours and shapes, such as extremely fine ribs, grooves or lines, which do not smooth the surface by adopting various means, such as embossing or molding with metal molds, thereby, the light is diffused asymmetrically to the screen, the visual field angle is widened and the videos, images, etc., projected on the screen are made distinctly, sharply and brightly visible even if a deviation in the angle of viewing the screen occurs.