Composite optical film and display device

The utility model discloses a composite optical film and a display device.The composite optical film comprises a first lens layer, a first base material layer, an attaching adhesive layer, a second lens layer, a second base material layer and a back coating, the first base material layer and the second lens layer are bonded through the attaching adhesive layer, the first lens layer comprises a plurality of first triangular prisms, and the second lens layer comprises a plurality of second triangular prisms; the second lens layer comprises a plurality of second triangular prisms, and the included angle of the peak tip of the first triangular prism is larger than that of the peak tip of the second triangular prism. The included angle of the peak tip of the first triangular prism is set to be larger than the included angle of the peak tip of the second triangular prism, the optical brightness index and the optical viewing angle index of the composite optical film can be improved, and therefore the optical perform