Abstract: A curved optic structure includes an optic film, a polarizer and a liquid crystal compensation film. The optic film includes a light incident side and a light exit side. The optic film has a curved surface on the light exit side. The polarizer is conformally attached on the curved surface. The liquid crystal compensation film is disposed at the light exit side of the optic film. The polarizer is located between the optic film and the liquid crystal compensation film. The liquid crystal compensation film includes a liquid crystal layer and a power supply. The liquid crystal layer includes a plurality of liquid crystals inside. The power supply is connected to a first side surface and an opposite second side surface of the liquid crystal layer.

Abstract: A head-up display includes a picture generation unit configured to project image light, a hexagonal optical reflection element arranged on a light path of the image light and including a hollow hexagonal cylinder, a concave mirror and an image display plate. The hollow hexagonal cylinder has a first sidewall, a second sidewall, a third sidewall, a fourth sidewall, a fifth sidewall and a sixth sidewall which are sequentially connected to form a closed hexagonal column. The second sidewall is transparent, and the first sidewall and the fifth sidewall opposite to the second sidewall are configured to reflect the image light. The concave mirror is disposed on the light path of the image light and configured to receive the image light reflected from the hollow hexagonal cylinder. The image display plate is configured to receive image light reflected from the concave mirror.

Abstract: An open-ended magnetic attraction charging device for an electronic cigarette includes a main body. A circuit board is disposed in the main body. The circuit board is connected with a power receiving end for connecting an external power source and a charging end for charging an electronic cigarette in a plane contact manner. The charging device has an ingenious and reasonable structure, realizes an open-ended charging design, and can match electronic cigarette charging interfaces of different sizes, solves the problem that the charging device is prone to overbalance, and improves the user experience.