Image projection apparatus, image projection system, image projection method, and display apparatus

An image projection method comprising:

• projecting a first image of a three-dimensional image onto a projection plate formed by an optically isotropic material in a predetermined thickness from a first display apparatus to display the first image utilizing a difference in a polarization direction of emission light,
• wherein the projection plate is disposed in a manner that a projection surface of the first image is inclined at a predetermined angle with respect to an emission surface of the first image in the first display apparatus, and also transmits at least a part of light from a surface on an opposite side of the projection surface.

A display apparatus comprising:

• displays a first image of a three-dimensional image by emitting light having
• a different polarization direction from an emission surface, and projects the first image toward a projection surface of a projection plate that has the projection surface disposed to be inclined at a predetermined angle with respect to the emission surface, that is formed by an optically isotropic material in a predetermined thickness, and that transmits at least a part of light from a surface on an opposite side of the projection surface.