. . . "The electron-emitting device according to Example 4 will be described with reference to FIGS. 4A and 4B. FIGS. 4A and 4B are schematic views of the electron-emitting device according to Example 4 of the present invention, wherein FIG. 4A is a plan view thereof and FIG. 4B a cross-sectional view along 4B-4B in FIG. 4A." .