Abstract: Provided display device includes at least one magnetic component, first display segment and second display segment connected to each other and foldable towards each other. The magnetic component includes first magnetic module located in non-display region of first display segment and second magnetic module located in non-display region of second display segment. The display device includes first folded state in which contact ends come into contact and second folded state in which the contact ends in contact for period of time. The attractive force A of the first magnetic module to the second magnetic module in the first folded state is smaller than the attractive force B thereof in the second folded state. The preceding solution can prevent the user's hands from being gripped when the user folds the display device and can ensure that the display device maintains stable folded state.

Abstract: A calibration device is provided. The calibration device includes a laser assembly, a calibration bracket and a magnetic element. The calibration bracket includes a loading platform which is configured to support the laser assembly. The magnetic element is mounted on one of the laser assembly and the loading platform, and is configured to attract the other of the laser assembly and the loading platform. By means of arranging the magnetic element on one of the loading platform and the laser assembly, the magnetic element can attract the other of the loading platform and the laser assembly, so that when the laser assembly needs to be mounted on the loading platform, the laser assembly only needs to approach the loading platform and the laser assembly will be attracted to the loading platform due to the magnetic force provided by the magnetic element.

Abstract: Some embodiments of the disclosure provide an optical imaging lens assembly and a display device. The optical imaging lens assembly includes: a lens barrel, a lens, and a microstructure. The lens barrel has a body and a mount hole disposed on the body; the lens is disposed in the mount hole; and an outer wall surface of the body and/or an inner wall surface of the mount hole is provided with the microstructure.

Abstract: The disclosure provides an optical imaging lens. The optical imaging lens includes a lens barrel and a plurality of lenses. The lens barrel is provided with an object-side end face and an image-side end face; the object-side end face has a tooth and groove structure that is arranged around a circumference of the lens barrel and extends in a direction away from a center axis of the lens barrel. The plurality of lenses are arranged at intervals along the center axis. The disclosure solves the problem that optical imaging lenses in the related art fail to achieve both low reflectivity and low cost.

Abstract: A retractable apparatus is provided. The retractable apparatus includes a stretchable mechanism. The stretchable mechanism includes a plurality of connecting portions arranged in a first plane. Adjacent connecting portions of the plurality of connecting portions are connected to each other in a retractable manner. At least three connecting portions are non-collinearly arranged.