| 摘要 |
A plurality of electron-emitting devices carried on a device substrate are arranged vis-a-vis an acceleration electrode carried on a face plate. The device substrate and the face plate, together with side walls disposed therebetween, constitute an envelope the inner space of which is kept under vacuum. A number of spacers are also disposed between the device substrate and the face plate within the inner space. The electric potential Va applied to the acceleration electrode, the distance l between the electron-emitting devices and the corresponding respective spacers, and the distance d between the electron-emitting devices and the acceleration electrode satisfy the relationship, Va.l2/d2>|DELTAVsat|/(2.alpha.beta), where alpha and beta are constants determined from several factors and DELTAVsat is the potential deviation of the spacer surface under charged conditions from that under uncharged conditions. |
