A latch mechanism used in a portable electronic device includes a housing member, a cover member, and a latching assembly. The multicarrier signal comprises a plurality of subcarriers. The first stacked structure includes first insulating patterns and first gate patterns which are alternately and repeatedly stacked on a substrate, and the second stacked structure includes second insulating patterns and second gate patterns which are alternately and repeatedly stacked on the first stacked structure. The invention also relates to improved devices, such as display devices, incorporating the phosphor powders. A control system controls the plurality of ink supply members to regulate an amount of ink supplied by each of the plurality of ink supply members so as to bring the amount of the corresponding ink accumulated into agreement with a predetermined value.