Patent ID: 6972203

Claim:
A method for manufacturing an electron-source substrate comprising the steps of: electrifying a plurality of electric conductors arranged on a substrate in a hermetic atmosphere so as to impart an electron-emission function to part of the electric conductors; setting an average temperature difference during the electrifying between a region S 0 in which the plurality of electric conductors on the substrate are arranged and a region S 1 located on a periphery of the region S 0 at 15° C. or more, wherein the substrate satisfies the relational expression: L 1 /L 0 >EαΔT/σth− 1, where L 0 [m] represents the width of the region S 0 L 1 [m] represents the width of the region S 1 ΔT[K] represents the average temperature difference E[Pa] represents Young's modulus of the substrate α[/K] represents the coefficient of linear thermal expansion of the substrate, and σth[Pa] represents the material constant of the substrate; cutting the substrate into desired sizes after the electrifying; and chamfering, polishing, and cleaning the periphery of the substrate after the cutting.