A monitor stand includes a base, a cylindrical housing located on the base, the housing having an opened top and bottom, and a packing assembly in the base for openingclosing the bottom of the housing. The method also includes polishing the first main surface of the stator component using the top surface of the protruded portion as a reference. The matrix has a King Stiffness greater than 1 N. A rear electrode 11 is formed on the organic luminescence part 9.