| 摘要 |
An augmented reality display is disclosed. A projector (11) is provided for creating a collimated input image. Light can be transmitted into a waveguide (12) in which it can travel by total internal reflection. The light is coupled out of the waveguide (12) by a diffraction grating (14) which diffracts light away from a viewer (15). A partially reflective, deformable mirror (18) is provided on the other side of the waveguide (12) from the viewer (15). The mirror (18) is generally arranged to adopt a spherical or parabolic shape and the radius of curvature can be varied so that the mirror (18) can alter the perceived position of the focal plane (17) for the projected light. The mirror (18) reflects light at equal angles, independently of its wavelength. Thus, the optical system and the mirror (18) is able to provide an adjustable focal plane (17) for projected light without introducing any chromatic aberration effects. |
