| 摘要 |
In an image display device, assuming a distance between electron sources and control electrodes as Lkg, a distance between the control electrodes and acceleration electrodes as L12, a thickness of opening holes formed in the control electrodes as Tg1 and a short diameter of the opening holes formed in the control electrodes as FG1, the acceleration electrodes satisfy the relationship (Lkg+Tg1+L12/2)/FG1>=0.25, assuming a thickness of the opening holes formed in the acceleration electrodes as Tg2 and a short diameter of the opening holes formed in the acceleration electrodes as FG2, the acceleration electrodes satisfy the relationship Tg2min<=Tg2<=Tg2max and the relationship Tg2min=2.98FG2-0.04, assuming FG2<0.109, the acceleration electrodes satisfy the relationship Tg2max=0.02/(0.115-FG2)-0.06, and assuming FG2>=0.109, the acceleration electrodes satisfy the relationship Tg2max=0.03/(FG2-0.1)+0.045. Due to such a constitution, the light emission control can be easily performed and the self-alignment of the electron sources and the control electrodes can be realized whereby the reduction of manufacturing cost and the tolerance in manufacture can be enhanced.
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