Projection screen driven by photran-shaped motor

The invention discloses a projection screen driven by a photran-shaped motor. The projection screen driven by the photran-shaped motor solves the problem that the photran-shaped motor applied to the projection screen can not spread out or put away the projection screen automatically. The projection screen driven by the photran-shaped motor comprises the photran-shaped motor, a projection screen body and a logic arithmetic circuit. The projection screen body is provided with an upper photoelectric sensor, a middle photoelectric sensor and a lower photoelectric sensor, wherein the photoelectric sensors generate a high level when illuminated by a projector, the upper photoelectric sensor is arranged on the top of the projection screen body, the middle photoelectric sensor is arranged on the bottom of the projection screen body, and the lower photoelectric sensor is arranged on an installation part extending downwards from the bottom of the projection screen body. The logic arithmetic circuit comprises a NOT gate arithmetic unit, an AND gate arithmetic unit and a NOR gate arithmetic unit. The photoelectric sensors, the photoelectric sensors and the photran-shaped motor are electrically connected. After the tubular motor is started to irradiate, level signals are sent out by the three photoelectric sensors according to light reception and processed by the logic arithmetic circuit so that the photran-shaped motor can drive the projection screen body to move to a proper position.