the line e e u2032 of the substrate of a the fluorescent layer 66 is not at a predetermined central region 601 it is the predetermined central regions 601 that the second connection ring shown in fig6 is inserted into the substrate 63 comprises a coating layer 68 and the transparent electrode layer 641 in the embodiment the coating layer 68 is made of a transparent plastic material such as pe and the transparent electrode layer 641 is made of an indium oxide tin ito film next as shown in fig1 a dielectric layer 65 is formed on the fluorescent layer 66 the dielectric layer 65 has the same shape as the fluorescent layer 66 next as shown in fig1 a lower electrode layer 64 made of a highly conductive material such as silver is formed on the dielectric layer 65 in fig1 c is a plan view and a and b are cross sectional view taken along lines f f u2032 and g g u2032 of c of fig1 after the formation of the lower electrode layer 64 the lower electrode layer 64 the dielectric layer 65 and the fluorescent layer 600 are removed at a predetermined region 601 to expose the transparent electrode layer 641 on the exposed transparent electrode is formed a connection electrode layer 76 which are apart from the neighboring layers the connection electrode 76 is made of a high conductive material such as silver on the other hand the lower electrode layer 64 is removed.