Projection device and method, projector, display system, and picture adjustment device

Abstract

A projection device and method, a projector, a display system, and a picture adjustment device. The projection device comprises: a light source assembly; a display assembly arranged on the side of the light source assembly that emits light, the light emitted by the light source assembly being projected to the non-display side of the display assembly; and a liquid crystal lens arranged on the side of the display assembly away from the light source assembly, the focal length of the projection device being adjusted by the voltage applied to liquid crystal molecules in the liquid crystal lens.

Dependencies are inferred from the claim text.