A screen having a projection surface on which a light beam irradiated by an optical equipment such as a projector is projected to form a projection image has luminous energy sensors (4U, 4D, 4L, 4R) and an attitude controller (70) for controlling the attitude of the projection surface based on the luminous energy detected by the luminous energy sensors (4U, 4D, 4L, 4R), in which, since the luminous energy sensors (4U, 4D, 4L, 4R) and the attitude controller (70) are provided, the attitude of the projection surface can be controllably adjusted by detecting the luminous energy of the projection image from the optical equipment, so that the projection surface of the screen can be correctly positioned relative to the optical equipment, thus automatically correcting trapezoidal distortion etc. of the projection image.
A reflection screen apparatus in which a projection apparatus projects an image based on received image data and an observer observes the image comprises a screen reflection surface which visibly diffuses and reflects the image projected by the projection apparatus to the observer. The reflection screen apparatus further has a light distribution correction section configured to change a state of a distribution direction of a light reflected on the screen reflection surface so as to increase a diffused light reflected on the screen reflection surface to the observer.
A projection screen unit includes a first projection surface optimized for a predetermined range of ambient conditions and a second projection surface optimized for a second, different range of ambient conditions.
