A large board placed behind the bowler, beyond the boundary, used to provide contrast to the ball, thereby aiding the striker in seeing the ball when it is delivered.

A sightscreen is a large board placed behind the bowler, beyond the boundary, to provide contrast to the ball. This helps the batsman see the ball clearly when it's delivered, especially when the ball color is similar to the background (like a red ball against spectators). Sightscreens are typically white or black depending on ball color.