Abstract: An electronic apparatus includes: an acquisition unit configured to acquire information on a remaining time representing a remaining usable time of the electronic apparatus; and a control unit configured to perform control to set any of a plurality of modes including a first mode and a second mode having power consumption of the electronic apparatus that is lower than power consumption of the electronic apparatus in the first mode, wherein the control unit performs processing to provide notification to prompt a user to switch from the first mode to the second mode in a case where the remaining time corresponding to the information acquired by the acquisition unit is less than a threshold and a predetermined condition for switching from the first mode to the second mode is satisfied in the first mode.

Abstract: A field-emission cold-cathode device including a substrate, an emitter having a sharp distal, a gate electrode having a hole in a region of the distal end of the emitter, and a focusing electrode formed farther from the distal end of the emitter than the gate electrode in a region of an end portion near the emitter.