Abstract: An ultra-thin broadband retardation film is provided. The broadband retardation film includes a first retardation film and a second retardation film. The second retardation film is disposed on a side of the first retardation film, wherein an in-plane retardation value Ro of the first retardation film is between 70 nm and 130 nm, an in-plane retardation value Ro of the second retardation film is between 140 nm and 260 nm, and an angle between an optic axis of the first retardation film and an optic axis of the second retardation film is between 35° and 70°.

Abstract: A display device is provided. The display device includes an organic light emitting diode display panel, a blue light brightness enhancement film and a polarizing film. The blue light brightness enhancement film is disposed on the organic light emitting diode display panel. The blue light brightness enhancement film includes a cholesteric liquid crystal layer and a quarter-wave phase retardation film, and the quarter-wave phase retardation film is disposed on the cholesteric liquid crystal layer. The polarizing film is disposed on the blue light brightness enhancement film.

Abstract: An optical film with a conductive function is provided. The optical film with the conductive function includes a liquid crystal optical compensation film and a conductive layer. The conductive layer is disposed on the liquid crystal optical compensation film.

Abstract: A polarizing plate with optical compensation function is provided. The polarizing plate includes a polarizer, a liquid crystal optical compensation film, a first adhesive layer, an adhesion-promoting layer, a protective film, and a second adhesive layer. The liquid crystal optical compensation film is disposed on one side of the polarizer. The first adhesive layer is disposed between the polarizer and the liquid crystal optical compensation film. The adhesion-promoting layer is disposed between the first adhesive layer and the liquid crystal optical compensation film. The protective film is disposed on one side of the polarizer relative to the liquid crystal optical compensation film. The second adhesive layer is disposed between the polarizer and the protective film.

Abstract: An ultra-thin broadband retardation film is provided. The broadband retardation film includes a first retardation film and a second retardation film. The second retardation film is disposed on a side of the first retardation film, wherein an in-plane retardation value Ro of the first retardation film is between 70 nm and 130 nm, an in-plane retardation value Ro of the second retardation film is between 140 nm and 260 nm, and an angle between an optic axis of the first retardation film and an optic axis of the second retardation film is between 35° and 70°.