A billfold, pocketbook, wallet or the like, has insertion compartments that are arranged in a staggered partially overlapping manner one above the other, and that are intended for receiving credit cards and the like through an insertion and removal opening of the respective compartment. The display apparatus includes a memory that stores a plurality of trap levels in association with a plurality of use durations of the light emitting element. The method inserts the optical fiber from the slit into the optical fiber insertion hole.