| 摘要 |
<p>An illumination unit provides light for a projection display system. The illumination unit includes a light guide defined by an entry angle. A light source 200 provides emitted light according to a characteristic radiation pattern. A lens arrangement including at least one lens collects a portion of the light emitted through the radiation pattern and focuses the collected light so as to reach the light guide within the entry angle 215. The portion of emitted light that is collected, and the collected light that enters the light guide within the angle, cooperate to maximize a percentage of the light source's emitted light that is usable by the projection optics portion of the system.</p> |
