Abstract: A controller for a display sign that displays a series of posters aligned in a row, including a top roller and a bottom roller, controlled by top and bottom motors, respectively. The sign displays one a series of posters arranged on a roll. The posters not in display remain wrapped around the top and bottom rollers as appropriate. The controller allows the poster's positions to be set relative to the rotation of the motors or rollers. When the motor operates to move the rollers to position another poster, the motor can decelerate gradually when approaching the other poster's position. The controller can also be used to program the order of display of the posters and the duration of time each poster is displayed.