Patent ID: 6236381
Filing Date: 2001-05-22
Classification: H01J

Abstract:
An image display apparatus comprising, in a vacuum container whose inside is kept under vacuum:a fluorescent layer;an electron emission source having an electron source;a deflecting electrode having a function to deflect electron beams emitted from the electron emission source; andan ultrafocusing electrode having a function to focus the electron beams deflected at the deflecting electrode and to land the focused electron beams on predetermined positions of the fluorescent layer,wherein the ultrafocusing electrode has slits that are formed with a pitch equal to the array pitch of the electron beams, the fluorescent layer has stripes that are formed with a pitch of 1/N (N is an integer) of the slit pitch of the ultrafocusing electrode, the ultrafocusing electrode is arranged between the electron emission source and the fluorescent layer while the deflecting electrode is arranged between the electron emission source and the ultrafocusing electrode, the slits form focusing lenses upon application of a voltage to the ultrafocusing electrode, and the focusing lenses have predetermined focusing power and refracting power to land the electron beams on the predetermined positions of the fluorescent layer and illuminate the fluorescent layer.