| 摘要 |
An electron emitter, such as for a display, has a substrate 10 and regions of n-type material 13 and p-type material 16 on the substrate arranged such that there is an interface junction 19 between the regions exposed directly to vacuum for the liberation of electrons. The p-type region may be a thin layer 16 on top of the n-type region 13 or the two regions may be layers (44 and 45, fig 3) on adjacent parts of the substrate with adjacent edges forming the interface junction. Alternatively, there many be multiple interface junctions formed by p-type particles or by both p-type and n-type particles (figs 4-7). The particles may be deposited on the substrate by an ink-jet printing technique. The p-type material is preferably diamond, which may be activated to exhibit negative electron affinity.
|
