Abstract: A terminal with an adjustable screen size includes: a first body; a second body disposed opposite to the first body; one or more stepping motors disposed on the first body or the second body and configured to drive a relative movement of the first body and the second body; a rotating shaft disposed on the second body; a chain plate driven around the rotating shaft, wherein a side of the chain plate is fixedly connected to the first body; and a flexible display screen flatly fixed onto the chain plate.

Abstract: The present disclosure provides a head mounted display that comprises display lenses, a frame body and at least one magnetic attraction part. The display lenses are configured to display augmented reality or virtual reality image content. The frame body comprises a carrying part configured to carry the display lenses. The at least one magnetic attraction part is disposed on the frame body and configured to magnetically attract a first lens unit or a second lens unit, so that the first lens unit or the second lens unit is attached to the frame body. The first lens unit comprises first magnetic elements, and the second lens unit comprises second magnetic elements.