Circular polarizer

The utility model provides a circular polarizer which is formed by sequentially stacking a first phase difference film, a polyvinyl alcohol film, a second phase difference film and a pressure-sensitive adhesive layer from top to bottom, and all the layers are bonded through glue. Wherein the optical slow axis of the first phase difference film and the absorption axis of the polyvinyl alcohol film form an angle of + 45 degrees or-45 degrees, and the first phase difference film is made of a polycarbonate film, a cycloolefin polymer film or a cellulose triacetate film. According to the utility model, the phase difference film with a specific optical axis direction is selected to replace the outermost scratch-resistant cellulose triacetate layer in the original conventional circular polarizer, so that the purpose of non-linear polarization of the OLED display screen is achieved, and the problem that the OLED display screen displays a black screen when light rays are closed in some specific use scenes is solved. 本