The degradation mechanism for the low voltage cathodoluminescence of
normalZnS:normalZn
and
false(Zn0.22Cd0.78false)S:normalAg,normalCl
phosphors in vacuum fluorescent displays has been investigated by mass spectrometer, field emission scanning electron microscope observation, Auger electron spectroscopy, and x‐ray photoelectron spectroscopy. It has been found that the decomposition and evaporation of phosphors take place during electron excitation. This causes the deterioration of cathode filaments as well as the decrease in luminous efficiency of the phosphors.
High-voltage triode flat-panel display using field-emission nanotube-based thin films Field emission displays ͑FED͒ are drawing attention as one of the most promising flat panel displays. Currently, the development stage of Spindt-type FEDs with Mo emitter is close to an end. The monocolor Spindt-type FEDs are being supplied to the market, and the color FEDs are ready for mass production. FED is also expected as a low power consumed display device, because the power, in principle, is consuming at the light emitting part only. The present status of FEDs with Spindt type and nanocarbon emitters are reported in this article.
1. Introduction FED is drawing attentions as one of the most promising flat panel displays. The technology of Spindt-type FEDs with MO emitter is being used in the field over three years [l]. The reliability and feasibility of Spindt-type FEDs has been confirmed. They show over 26,000 hours lifetime by now. For large size panel carbon nano-tube FED (CNT-FED) is under development. FEDs will be used for not only the applications of small, medium size panels but also those of large-size panels.The present status of Spindt-type FED and CNT-FED are reported in this paper.2. Spindt-type FED Spindt-type emitters have some advantages as follows.1) The emission efficiency of Spindt-type emitter is very high and the extractive rate (anode currentkathode current) is more than 98%. The configuration of emitters emission is easily obtain. The substrate size is not limited compared to that of Si emitters and large size glass plates are used for substrates as same as LCD panels. 4) Stable emission can be obtained with using resistive layers or current control elements. Therefore Spindt-type emitters will be able to become the best emission source of FEDs toRecently we have developed new fabricating process of Spindt-type emitters with 0.5 -0.7 pm gate holes in diameter on all over SO0 mm square glass plates with using conventional lithography system. And thus we could increase the emitter density more than 4 times that of our conventional type. By the improvement of this process and structure we realized the high-density small sized Spindt-type emitters and it enables to drive the Spindt-type emitters with lower power consumption. Figure 1 shows the SEM images of our high-density small size Spindt-type emitters. By this development we could decrease the maximum gate voltage from 90 V to less than 48 V with maintain the productivity in Fig.2 [2].
2)is very accurate and thus uniform and optimum electric 3)improve the characteristics and the throughput of manufacturing. Figure 3 shows the appearance of the 8" color FED panel presented at CEATEC'02. Table 1 shows the specification of the 8" color FED. We believe that it is possible to make Spindt-type color FED one of the major display devices in the market in the near future.
Kyoto University assisted in meeting the publication costs of this article. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.218.248.209 Downloaded on 2015-03-29 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.218.248.209 Downloaded on 2015-03-29 to IP
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