| 摘要 |
<p>The present invention provides a projection display 10, for displaying an image to a viewer. An image-providing light source device 60 is arranged to inject an input pupil 61 of multi-spectral image bearing light into a waveguide assembly. The waveguide assembly 50 comprises first and second diffraction regions arranged respectively for expanding the input pupil in first and second generally orthogonal dimensions and outputting an exit pupil 54 expanded in the first and second dimensions from the waveguide assembly. The diffractive regions of the waveguide assembly are matched to cause zero or substantially zero net chromatic aberration. A combiner 16 is arranged to direct the exit pupil towards a viewer for viewing an image 18 and to transmit light from a real world scene 52 through the combiner so that the image overlays the light from the real world scene.</p> |
