An MTC device activates an MTC service by first performing an MTC device attachment procedure to attach to a mobile communication network. A compound that can be electrically decomposed to release on demand and over an extended period of time, an oxidant is included in the layered structure, preferably in the electrolyte layer. 2 to 6, the ratio of p and q to one another, depending upon m and n and, as applicable, the number of charged G1, being such that in formula there is no excess positive or negative charge. As a result, the vacuum bubbles in the display region can be filled with the liquid crystals, so that the vacuum bubbles can be eliminated from the display region.