Abstract: The projection lens arrangement includes a projection lens assembly having a plurality of lens elements aligned in a common optical path, and arranged in a generally Tessar configuration. One of the lens elements is movable along the optical path in a linear fashion. Another one of the lens elements is movable along the optical path in a non-linear manner, wherein the two lens elements move along the optical path substantially concurrently. The movement of the non-linearly moving element is slaved to the movement of the linearly moving element. A field lens element directs the flux from an image display unit to the entrance pupil of the projection lens assembly.

Abstract: A projector and a method of using it includes an expandable housing, which includes a display panel assembly, and an illumination and display panel projection optics arrangement. The housing includes housing portions which are movably mounted relative to one another, to increase the overall dimensions of the housing adjustably to accommodate the display panel optics arrangement during use as a projector.