| 摘要 |
<p>A waveguide (112) includes a substrate of material (134) having optical layers (148, 152) applied to two external surfaces (146, 150). This reduces the critical angle ?c5 of the substrate of material (134) to provide greater interaction between image bearing light following a light path (140) and a grating element (142) and/or a greater total field of view (160), when compared to the total field of view (132) of a prior art waveguide (110), that is capable of being transmitted by the waveguide (112). Such a waveguide (112) can be used in a projection display.</p> |
