| 摘要 |
A light transmission unit, such as a liquid crystal cell, operated by an electronic control circuit is interposed in the illumination system of a viewing system for providing a plurality of selectable illumination or viewing conditions, such as transmissive illumination, incident illumination, oblique illuminations, differentially shaded illumination, dark field illumination, bright field illumination, phase contrast illumination, differential polarization illumination, and/or color illumination.
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