A control key assembly for an electronic device includes a housing and a control key. The coatings are suitably applied via an atomic layer deposition process. The target retransmits the received periodic signal to the beacon transceiver as a return periodic signal. , provided to be elongated vertically. Liquid crystal material wraparound can be prevented by forming a seal stopper portion outside a peripheral seal portion, and in addition, by increasing the degree of symmetry of the seal pattern and by forming a damming portion between injection ports, gap inconsistencies within the liquid crystal display device can be reduced.