| 摘要 |
An exit pupil expander (904), operable as a numerical aperture expander and suitable for use with high angle of incidence scanned laser projection systems, includes a microlens array (910) and a varied thickness optical element (900). The varied thickness optical element can be configured to transform a principal beam (953) of a received scan cone (952) to be substantially orthogonal with an output of the exit pupil expander (904) or major surface of the microlens array (910). Further, the varied thickness optical element (900) can be configured to cause the received scan cone (952) to exit the varied thickness optical element (900) substantially symmetrically about the principal beam (953). The varied thickness optical element (900) can also be configured to introduce a controlled amount of spread to the received scan cone (952). The varied thickness optical element (900) is useful in correcting distortion, such as keystone distortion introduced by high angle of incidence feed. |
