Optical film stack with high mechanical stability, and preparation method thereof

The invention relates to an optical film stack, especially relates to an optical film stack with high mechanical stability, and a preparation method thereof, and provides an optical film stack with high mechanical stability, and a preparation method thereof, for the purposes of improving the mechanical stability of an optical film stack and avoiding the problem of easy separation of each layer of structures during cutting of the optical film stack. The optical film stack comprises a built-in light emitting surface and an adhesive layer, wherein the built-in light emitting surface and the adhesive layer are bonded together; the built-in light emitting surface has a structural surface, and the structural top portion of the structural surface is provided with a depression; and the top portion of the structural surface extends into the adhesive layer. The optical film stack has the following advantages: quite high optical functionality is maintained, and while a formula is not changed and the cost is not increase