A pressure-sensitive adhesive sheet includes a base material and a pressure-sensitive adhesive layer and is formed therein with a plurality of through-holes passing through from one surface to the other surface. The novel method enables poorly accessible sections to be reached. Each of the arms is joined to one of sidewalls of the pit-defining housing at that area region which extends inwardly from a terminal end of the arm along an inside of the arm. The display device also includes dichroic filter layers to improve light recycling and backlight efficiency.