An Electrically Tunable Focusing Pico Projector Using a Liquid Crystal Lens as an Active Optical Element

摘要

An electrically tunable pico projector adapting a liquid crystal (LC) lens as an active optical element is demonstrated. The electrically tunable focusing properties of the pico-projectors with different aperture sizes of the LC lenses are also investigated. The tunable ranges of the electrically tunable pico projectors are 350 cm to ～14 cm. The response times are 1.2 sec for the LC lens of 2 mm aperture and around 5 sec for the LC lens of 4 mm aperture. The image performance of the electrically tunable focusing pico projector is demonstrated.