Prism array

Patent Pending PROBLEM TO BE SOLVED: To provide a prism array for a rear projection screen having excellent effect of suppressing stray light. ; SOLUTION: When a rear projection screen is composed of a prism array in which many prisms each receiving projector light with a prescribed light incident angle on a light receiving face, thereafter totally reflecting the light at a reflecting face, and emitting the reflected light toward a light emitting face are arranged in parallel, the respective prisms are separated to the arranging direction.