Electron-emitting device manufacturing method, electron source manufacturing method, image-forming apparatus manufacturing method, and information displaying and playing apparatus manufacturing method

A manufacturing method of an electron-emitting device, including a first electrode having a plurality of fibers and a second electrode located at a distance from the first electrode, and emitting an electron into a vacuum space from one or more of fibers not short-circuiting between the first and second electrodes, comprising:

• a step of preparing the first electrode including a plurality of fibers each containing carbon and the second electrode;
• a step of preparing the fibers not short-circuiting between the first and second electrodes by ablating one or more of fibers short-circuiting between the first and second electrodes by flowing a current into the one or more of the fibers,
• wherein the step of preparing the fibers not short-circuiting between the first and second electrodes comprises a step of applying a potential higher than a potential of the second electrode to the first electrode;
• and
• a step of electrically connecting, to the first and second electrodes, a potential applying unit for applying, to the first electrode, the potential lower than the potential of the second electrode.