Abstract: An image display unit, such as a projection-type image display apparatus, displays a first image and a second image, having a predetermined parallax relative to the first image, onto a predetermined display region by dividing the first image and the second image temporally or spatially. First eyeglasses are to be worn by a first viewer to see the first image and the second image displayed on the display region. Second eyeglasses are to be worn by a second viewer to see the first image and the second image displayed on the display region, and the second viewer faces the first viewer in a direction parallel to the plane of display. The first eyeglasses perform a function of having the right eye of the first viewer see the first image and having the left eye of the first viewer see the second image. The second eyeglasses perform a function of having the right eye of the second viewer see the second image and having the left eye of the second viewer see the first image.

Abstract: A first detection unit and a second detection unit detect the light that is incident from the direction where a screen is to be located. A controller determines whether the screen is located at a recommended position based on output signals from the first detection unit and the second detection unit. When the screen is located at the recommended position, the controller controls the projection display apparatus so as to be in the state where a significant image can be projected. The controller may determine whether the screen is located at the recommended position and in a normal state based on the output signals. When the screen is located at the recommended position and in a normal state, the controller may control the projection display apparatus so as to be in the state where a significant image can be projected.

Abstract: A projection display apparatus 100 includes a housing 200 configured to house an illumination optics 110 and a projection optics 120. The housing 200 includes a virtual cylindrical layout space 300 having as a base a circumscribed circle of the projection optics 120 in a cross-section perpendicular to an optical axis of the projection optics 120. The layout space 300 includes a first layout space 310 of approximately conical shape and a second layout space 320 left after excluding the first layout space 310. The projection optics 120 is provided in the first layout space 310. A specific optical element among optical elements included in the illumination optics 110 is provided in the second layout space 320.

Abstract: A first detection unit and a second detection unit detect the light that is incident from the direction where a screen is to be located. A controller determines whether the screen is located at a recommended position based on output signals from the first detection unit and the second detection unit. When the screen is located at the recommended position, the controller controls the projection display apparatus so as to be in the state where a significant image can be projected. The controller may determine whether the screen is located at the recommended position and in a normal state based on the output signals. When the screen is located at the recommended position and in a normal state, the controller may control the projection display apparatus so as to be in the state where a significant image can be projected.

Abstract: A camera for capturing an object that will enter a projection space is attached to the casing of a projection display apparatus. The camera is installed at the position in which, when the camera faces the projection plane, at least one of the back direction and the side direction of the casing is included within the filed of view of the camera. For example, the cameras are installed on both side edges of the casing so as to face each other.

Abstract: An image display unit, such as a projection-type image display apparatus, displays a first image and a second image, having a predetermined parallax relative to the first image, onto a predetermined display region by dividing the first image and the second image temporally or spatially. First eyeglasses are to be worn by a first viewer to see the first image and the second image displayed on the display region. Second eyeglasses are to be worn by a second viewer to see the first image and the second image displayed on the display region, and the second viewer faces the first viewer in a direction parallel to the plane of display. The first eyeglasses perform a function of having the right eye of the first viewer see the first image and having the left eye of the first viewer see the second image. The second eyeglasses perform a function of having the right eye of the second viewer see the second image and having the left eye of the second viewer see the first image.